jcc.c

   1 /*********************************************************************
   2  *
   3  * File        :  $Source: /cvsroot/ijbswa/current/jcc.c,v $
   4  *
   5  * Purpose     :  Main file.  Contains main() method, main loop, and
   6  *                the main connection-handling function.
   7  *
   8  * Copyright   :  Written by and Copyright (C) 2001-2021 the
   9  *                Privoxy team. https://www.privoxy.org/
  10  *
  11  *                Based on the Internet Junkbuster originally written
  12  *                by and Copyright (C) 1997 Anonymous Coders and
  13  *                Junkbusters Corporation.  http://www.junkbusters.com
  14  *
  15  *                This program is free software; you can redistribute it
  16  *                and/or modify it under the terms of the GNU General
  17  *                Public License as published by the Free Software
  18  *                Foundation; either version 2 of the License, or (at
  19  *                your option) any later version.
  20  *
  21  *                This program is distributed in the hope that it will
  22  *                be useful, but WITHOUT ANY WARRANTY; without even the
  23  *                implied warranty of MERCHANTABILITY or FITNESS FOR A
  24  *                PARTICULAR PURPOSE.  See the GNU General Public
  25  *                License for more details.
  26  *
  27  *                The GNU General Public License should be included with
  28  *                this file.  If not, you can view it at
  29  *                http://www.gnu.org/copyleft/gpl.html
  30  *                or write to the Free Software Foundation, Inc., 59
  31  *                Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  32  *
  33  *********************************************************************/
  34
  35
  36 #include "config.h"
  37
  38 #include <stdio.h>
  39 #include <sys/types.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <signal.h>
  43 #include <fcntl.h>
  44 #include <errno.h>
  45 #include <assert.h>
  46
  47 #ifdef _WIN32
  48 # ifndef FEATURE_PTHREAD
  49 #  ifndef STRICT
  50 #   define STRICT
  51 #  endif
  52 #  include <winsock2.h>
  53 #  include <windows.h>
  54 #  include <process.h>
  55 # endif /* ndef FEATURE_PTHREAD */
  56
  57 # include "win32.h"
  58 # ifndef _WIN_CONSOLE
  59 #  include "w32log.h"
  60 # endif /* ndef _WIN_CONSOLE */
  61 # include "w32svrapi.h"
  62
  63 #else /* ifndef _WIN32 */
  64
  65 # include <unistd.h>
  66 # include <sys/wait.h>
  67 # include <sys/time.h>
  68 # include <sys/stat.h>
  69 # include <sys/ioctl.h>
  70
  71 #ifdef sun
  72 #include <sys/termios.h>
  73 #endif /* sun */
  74
  75 #ifdef unix
  76 #include <pwd.h>
  77 #include <grp.h>
  78 #endif
  79
  80 # include <signal.h>
  81
  82 # ifdef __BEOS__
  83 #  include <socket.h>  /* BeOS has select() for sockets only. */
  84 #  include <OS.h>      /* declarations for threads and stuff. */
  85 # endif
  86
  87 #ifdef HAVE_POLL
  88 #ifdef __GLIBC__
  89 #include <sys/poll.h>
  90 #else
  91 #include <poll.h>
  92 #endif /* def __GLIBC__ */
  93 #else
  94 # ifndef FD_ZERO
  95 #  include <select.h>
  96 # endif
  97 #warning poll() appears to be unavailable. Your platform will become unsupported in the future.
  98 #endif /* HAVE_POLL */
  99
 100 #endif
 101
 102 #include "project.h"
 103 #include "list.h"
 104 #include "jcc.h"
 105 #ifdef FEATURE_HTTPS_INSPECTION
 106 #include "ssl.h"
 107 #endif
 108 #include "filters.h"
 109 #include "loaders.h"
 110 #include "parsers.h"
 111 #include "miscutil.h"
 112 #include "errlog.h"
 113 #include "jbsockets.h"
 114 #include "gateway.h"
 115 #include "actions.h"
 116 #include "cgi.h"
 117 #include "loadcfg.h"
 118 #include "urlmatch.h"
 119 #ifdef FEATURE_CLIENT_TAGS
 120 #include "client-tags.h"
 121 #endif
 122
 123 int daemon_mode = 1;
 124 struct client_states clients[1];
 125 struct file_list     files[1];
 126
 127 #ifdef FEATURE_STATISTICS
 128 int urls_read     = 0;     /* total nr of urls read inc rejected */
 129 int urls_rejected = 0;     /* total nr of urls rejected */
 130 #endif /* def FEATURE_STATISTICS */
 131
 132 #ifdef FEATURE_GRACEFUL_TERMINATION
 133 int g_terminate = 0;
 134 #endif
 135
 136 #if !defined(_WIN32)
 137 static void sig_handler(int the_signal);
 138 #endif
 139 static int client_protocol_is_unsupported(struct client_state *csp, char *req);
 140 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
 141 static jb_err get_server_headers(struct client_state *csp);
 142 static const char *crunch_reason(const struct http_response *rsp);
 143 static void send_crunch_response(struct client_state *csp, struct http_response *rsp);
 144 static char *get_request_line(struct client_state *csp);
 145 static jb_err receive_client_request(struct client_state *csp);
 146 static jb_err parse_client_request(struct client_state *csp);
 147 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
 148 static jb_err change_request_destination(struct client_state *csp);
 149 static void handle_established_connection(struct client_state *csp);
 150 static void chat(struct client_state *csp);
 151 static void serve(struct client_state *csp);
 152 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
 153 static void usage(const char *myname);
 154 #endif
 155 static void initialize_mutexes(void);
 156 static jb_socket bind_port_helper(const char *haddr, int hport, int backlog);
 157 static void bind_ports_helper(struct configuration_spec *config, jb_socket sockets[]);
 158 static void close_ports_helper(jb_socket sockets[]);
 159 static void listen_loop(void);
 160 static void serve(struct client_state *csp);
 161
 162 #ifdef __BEOS__
 163 static int32 server_thread(void *data);
 164 #endif /* def __BEOS__ */
 165
 166 #ifdef _WIN32
 167 #define sleep(N)  Sleep(((N) * 1000))
 168 #endif
 169
 170 #ifdef FUZZ
 171 int process_fuzzed_input(char *fuzz_input_type, char *fuzz_input_file);
 172 void show_fuzz_usage(const char *name);
 173 #endif
 174
 175 #ifdef MUTEX_LOCKS_AVAILABLE
 176 /*
 177  * XXX: Does the locking stuff really belong in this file?
 178  */
 179 privoxy_mutex_t log_mutex;
 180 privoxy_mutex_t log_init_mutex;
 181 privoxy_mutex_t connection_reuse_mutex;
 182
 183 #ifdef FEATURE_HTTPS_INSPECTION
 184 privoxy_mutex_t certificate_mutex;
 185 privoxy_mutex_t ssl_init_mutex;
 186 #endif
 187
 188 #ifdef FEATURE_EXTERNAL_FILTERS
 189 privoxy_mutex_t external_filter_mutex;
 190 #endif
 191 #ifdef FEATURE_CLIENT_TAGS
 192 privoxy_mutex_t client_tags_mutex;
 193 #endif
 194 #ifdef FEATURE_EXTENDED_STATISTICS
 195 privoxy_mutex_t filter_statistics_mutex;
 196 privoxy_mutex_t block_statistics_mutex;
 197 #endif
 198
 199 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
 200 privoxy_mutex_t resolver_mutex;
 201 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
 202
 203 #ifndef HAVE_GMTIME_R
 204 privoxy_mutex_t gmtime_mutex;
 205 #endif /* ndef HAVE_GMTIME_R */
 206
 207 #ifndef HAVE_LOCALTIME_R
 208 privoxy_mutex_t localtime_mutex;
 209 #endif /* ndef HAVE_GMTIME_R */
 210
 211 #if !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM)
 212 privoxy_mutex_t rand_mutex;
 213 #endif /* !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM) */
 214
 215 #endif /* def MUTEX_LOCKS_AVAILABLE */
 216
 217 #if defined(unix)
 218 const char *basedir = NULL;
 219 const char *pidfile = NULL;
 220 static int received_hup_signal = 0;
 221 #endif /* defined unix */
 222
 223 /* HTTP snipplets. */
 224 static const char CSUCCEED[] =
 225    "HTTP/1.1 200 Connection established\r\n\r\n";
 226
 227 static const char CHEADER[] =
 228    "HTTP/1.1 400 Invalid header received from client\r\n"
 229    "Content-Type: text/plain\r\n"
 230    "Connection: close\r\n\r\n"
 231    "Invalid header received from client.\r\n";
 232
 233 static const char FTP_RESPONSE[] =
 234    "HTTP/1.1 400 Invalid request received from client\r\n"
 235    "Content-Type: text/plain\r\n"
 236    "Connection: close\r\n\r\n"
 237    "Invalid request. Privoxy doesn't support FTP.\r\n";
 238
 239 static const char GOPHER_RESPONSE[] =
 240    "HTTP/1.1 400 Invalid request received from client\r\n"
 241    "Content-Type: text/plain\r\n"
 242    "Connection: close\r\n\r\n"
 243    "Invalid request. Privoxy doesn't support gopher.\r\n";
 244
 245 /* XXX: should be a template */
 246 static const char MISSING_DESTINATION_RESPONSE[] =
 247    "HTTP/1.1 400 Bad request received from client\r\n"
 248    "Content-Type: text/plain\r\n"
 249    "Connection: close\r\n\r\n"
 250    "Bad request. Privoxy was unable to extract the destination.\r\n";
 251
 252 /* XXX: should be a template */
 253 static const char INVALID_SERVER_HEADERS_RESPONSE[] =
 254    "HTTP/1.1 502 Server or forwarder response invalid\r\n"
 255    "Content-Type: text/plain\r\n"
 256    "Connection: close\r\n\r\n"
 257    "Bad response. The server or forwarder response doesn't look like HTTP.\r\n";
 258
 259 /* XXX: should be a template */
 260 static const char MESSED_UP_REQUEST_RESPONSE[] =
 261    "HTTP/1.1 400 Malformed request after rewriting\r\n"
 262    "Content-Type: text/plain\r\n"
 263    "Connection: close\r\n\r\n"
 264    "Bad request. Messed up with header filters.\r\n";
 265
 266 static const char TOO_MANY_CONNECTIONS_RESPONSE[] =
 267    "HTTP/1.1 503 Too many open connections\r\n"
 268    "Content-Type: text/plain\r\n"
 269    "Connection: close\r\n\r\n"
 270    "Maximum number of open connections reached.\r\n";
 271
 272 static const char CLIENT_CONNECTION_TIMEOUT_RESPONSE[] =
 273    "HTTP/1.1 504 Connection timeout\r\n"
 274    "Content-Type: text/plain\r\n"
 275    "Connection: close\r\n\r\n"
 276    "The connection timed out because the client request didn't arrive in time.\r\n";
 277
 278 static const char CLIENT_BODY_PARSE_ERROR_RESPONSE[] =
 279    "HTTP/1.1 400 Failed reading client body\r\n"
 280    "Content-Type: text/plain\r\n"
 281    "Connection: close\r\n\r\n"
 282    "Failed parsing or buffering the chunk-encoded client body.\r\n";
 283
 284 static const char UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE[] =
 285    "HTTP/1.1 417 Expecting too much\r\n"
 286    "Content-Type: text/plain\r\n"
 287    "Connection: close\r\n\r\n"
 288    "Privoxy detected an unsupported Expect header value.\r\n";
 289
 290 /* A function to crunch a response */
 291 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
 292
 293 /* Crunch function flags */
 294 #define CF_NO_FLAGS        0
 295 /* Cruncher applies to forced requests as well */
 296 #define CF_IGNORE_FORCE    1
 297 /* Crunched requests are counted for the block statistics */
 298 #define CF_COUNT_AS_REJECT 2
 299
 300 /* A crunch function and its flags */
 301 struct cruncher
 302 {
 303    const crunch_func_ptr cruncher;
 304    const int flags;
 305 };
 306
 307 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
 308
 309 /* Complete list of cruncher functions */
 310 static const struct cruncher crunchers_all[] = {
 311    { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
 312    { block_url,       CF_COUNT_AS_REJECT },
 313 #ifdef FEATURE_TRUST
 314    { trust_url,       CF_COUNT_AS_REJECT },
 315 #endif /* def FEATURE_TRUST */
 316    { redirect_url,    CF_NO_FLAGS  },
 317    { dispatch_cgi,    CF_IGNORE_FORCE},
 318    { NULL,            0 }
 319 };
 320
 321 /* Light version, used after tags are applied */
 322 static const struct cruncher crunchers_light[] = {
 323    { block_url,       CF_COUNT_AS_REJECT },
 324    { redirect_url,    CF_NO_FLAGS },
 325    { NULL,            0 }
 326 };
 327
 328
 329 /*
 330  * XXX: Don't we really mean
 331  *
 332  * #if defined(unix)
 333  *
 334  * here?
 335  */
 336 #if !defined(_WIN32)
 337 /*********************************************************************
 338  *
 339  * Function    :  sig_handler
 340  *
 341  * Description :  Signal handler for different signals.
 342  *                Exit gracefully on TERM and INT
 343  *                or set a flag that will cause the errlog
 344  *                to be reopened by the main thread on HUP.
 345  *
 346  * Parameters  :
 347  *          1  :  the_signal = the signal cause this function to call
 348  *
 349  * Returns     :  -
 350  *
 351  *********************************************************************/
 352 static void sig_handler(int the_signal)
 353 {
 354    switch(the_signal)
 355    {
 356       case SIGTERM:
 357       case SIGINT:
 358          log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
 359 #if defined(unix)
 360          if (pidfile)
 361          {
 362             unlink(pidfile);
 363          }
 364 #endif /* unix */
 365          exit(the_signal);
 366          break;
 367
 368       case SIGHUP:
 369 #if defined(unix)
 370          received_hup_signal = 1;
 371 #endif
 372          break;
 373
 374       default:
 375          /*
 376           * We shouldn't be here, unless we catch signals
 377           * in main() that we can't handle here!
 378           */
 379          log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
 380    }
 381    return;
 382
 383 }
 384 #endif
 385
 386
 387 /*********************************************************************
 388  *
 389  * Function    :  get_write_delay
 390  *
 391  * Description :  Parse the delay-response parameter.
 392  *
 393  * Parameters  :
 394  *          1  :  csp = Current client state (buffers, headers, etc...)
 395  *
 396  * Returns     :  Number of milliseconds to delay writes.
 397  *
 398  *********************************************************************/
 399 static unsigned int get_write_delay(const struct client_state *csp)
 400 {
 401    unsigned int delay;
 402    char *endptr;
 403    char *newval;
 404
 405    if ((csp->action->flags & ACTION_DELAY_RESPONSE) == 0)
 406    {
 407       return 0;
 408    }
 409    newval = csp->action->string[ACTION_STRING_DELAY_RESPONSE];
 410
 411    delay = (unsigned)strtol(newval, &endptr, 0);
 412    if (*endptr != '\0')
 413    {
 414       log_error(LOG_LEVEL_FATAL,
 415          "Invalid delay-response{} parameter: '%s'", newval);
 416    }
 417
 418    return delay;
 419
 420 }
 421
 422
 423 /*********************************************************************
 424  *
 425  * Function    :  client_protocol_is_unsupported
 426  *
 427  * Description :  Checks if the client used a known unsupported
 428  *                protocol and deals with it by sending an error
 429  *                response.
 430  *
 431  * Parameters  :
 432  *          1  :  csp = Current client state (buffers, headers, etc...)
 433  *          2  :  req = the first request line send by the client
 434  *
 435  * Returns     :  TRUE if an error response has been generated, or
 436  *                FALSE if the request doesn't look invalid.
 437  *
 438  *********************************************************************/
 439 static int client_protocol_is_unsupported(struct client_state *csp, char *req)
 440 {
 441    /*
 442     * If it's a FTP or gopher request, we don't support it.
 443     *
 444     * These checks are better than nothing, but they might
 445     * not work in all configurations and some clients might
 446     * have problems digesting the answer.
 447     *
 448     * They should, however, never cause more problems than
 449     * Privoxy's old behaviour (returning the misleading HTML
 450     * error message:
 451     *
 452     * "Could not resolve http://(ftp|gopher)://example.org").
 453     */
 454    if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
 455    {
 456       const char *response = NULL;
 457       const char *protocol = NULL;
 458
 459       if (!strncmpic(req, "GET ftp://", 10))
 460       {
 461          response = FTP_RESPONSE;
 462          protocol = "FTP";
 463       }
 464       else
 465       {
 466          response = GOPHER_RESPONSE;
 467          protocol = "GOPHER";
 468       }
 469       log_error(LOG_LEVEL_ERROR,
 470          "%s tried to use Privoxy as %s proxy: %s",
 471          csp->ip_addr_str, protocol, req);
 472       log_error(LOG_LEVEL_CLF,
 473          "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
 474       freez(req);
 475
 476 #ifdef FEATURE_HTTPS_INSPECTION
 477       if (client_use_ssl(csp))
 478       {
 479          ssl_send_data_delayed(&(csp->ssl_client_attr),
 480             (const unsigned char *)response, strlen(response),
 481             get_write_delay(csp));
 482       }
 483       else
 484 #endif
 485       {
 486          write_socket_delayed(csp->cfd, response, strlen(response),
 487             get_write_delay(csp));
 488       }
 489
 490       return TRUE;
 491    }
 492
 493    return FALSE;
 494 }
 495
 496
 497 /*********************************************************************
 498  *
 499  * Function    :  client_has_unsupported_expectations
 500  *
 501  * Description :  Checks if the client used an unsupported expectation
 502  *                in which case an error message is delivered.
 503  *
 504  * Parameters  :
 505  *          1  :  csp = Current client state (buffers, headers, etc...)
 506  *
 507  * Returns     :  TRUE if an error response has been generated, or
 508  *                FALSE if the request doesn't look invalid.
 509  *
 510  *********************************************************************/
 511 static int client_has_unsupported_expectations(const struct client_state *csp)
 512 {
 513    if ((csp->flags & CSP_FLAG_UNSUPPORTED_CLIENT_EXPECTATION))
 514    {
 515       log_error(LOG_LEVEL_ERROR,
 516          "Rejecting request from client %s with unsupported Expect header value",
 517          csp->ip_addr_str);
 518       log_error(LOG_LEVEL_CLF,
 519          "%s - - [%T] \"%s\" 417 0", csp->ip_addr_str, csp->http->cmd);
 520       write_socket_delayed(csp->cfd,
 521          UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE,
 522          strlen(UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE),
 523          get_write_delay(csp));
 524
 525       return TRUE;
 526    }
 527
 528    return FALSE;
 529
 530 }
 531
 532
 533 /*********************************************************************
 534  *
 535  * Function    :  get_request_destination_elsewhere
 536  *
 537  * Description :  If the client's request was redirected into
 538  *                Privoxy without the client's knowledge,
 539  *                the request line lacks the destination host.
 540  *
 541  *                This function tries to get it elsewhere,
 542  *                provided accept-intercepted-requests is enabled.
 543  *
 544  *                "Elsewhere" currently only means "Host: header",
 545  *                but in the future we may ask the redirecting
 546  *                packet filter to look the destination up.
 547  *
 548  *                If the destination stays unknown, an error
 549  *                response is send to the client and headers
 550  *                are freed so that chat() can return directly.
 551  *
 552  * Parameters  :
 553  *          1  :  csp = Current client state (buffers, headers, etc...)
 554  *          2  :  headers = a header list
 555  *
 556  * Returns     :  JB_ERR_OK if the destination is now known, or
 557  *                JB_ERR_PARSE if it isn't.
 558  *
 559  *********************************************************************/
 560 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
 561 {
 562    if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
 563    {
 564       log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
 565          " Privoxy isn't configured to accept intercepted requests.",
 566          csp->ip_addr_str, csp->http->cmd);
 567       /* XXX: Use correct size */
 568       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
 569          csp->ip_addr_str, csp->http->cmd);
 570
 571       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER),
 572          get_write_delay(csp));
 573       destroy_list(headers);
 574
 575       return JB_ERR_PARSE;
 576    }
 577    else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
 578    {
 579       /* Split the domain we just got for pattern matching */
 580       init_domain_components(csp->http);
 581
 582       return JB_ERR_OK;
 583    }
 584    else
 585    {
 586       /* We can't work without destination. Go spread the news.*/
 587
 588       /* XXX: Use correct size */
 589       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
 590          csp->ip_addr_str, csp->http->cmd);
 591       log_error(LOG_LEVEL_ERROR,
 592          "Privoxy was unable to get the destination for %s's request: %s",
 593          csp->ip_addr_str, csp->http->cmd);
 594
 595       write_socket_delayed(csp->cfd, MISSING_DESTINATION_RESPONSE,
 596          strlen(MISSING_DESTINATION_RESPONSE), get_write_delay(csp));
 597       destroy_list(headers);
 598
 599       return JB_ERR_PARSE;
 600    }
 601    /*
 602     * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
 603     * to get the destination IP address, use it as host directly
 604     * or do a reverse DNS lookup first.
 605     */
 606 }
 607
 608
 609 /*********************************************************************
 610  *
 611  * Function    :  get_server_headers
 612  *
 613  * Description :  Parses server headers in iob and fills them
 614  *                into csp->headers so that they can later be
 615  *                handled by sed().
 616  *
 617  * Parameters  :
 618  *          1  :  csp = Current client state (buffers, headers, etc...)
 619  *
 620  * Returns     :  JB_ERR_OK if everything went fine, or
 621  *                JB_ERR_PARSE if the headers were incomplete.
 622  *
 623  *********************************************************************/
 624 static jb_err get_server_headers(struct client_state *csp)
 625 {
 626    int continue_hack_in_da_house = 0;
 627    char * header;
 628
 629    while (((header = get_header(csp->iob)) != NULL) || continue_hack_in_da_house)
 630    {
 631       if (header == NULL)
 632       {
 633          /*
 634           * continue hack in da house. Ignore the ending of
 635           * this head and continue enlisting header lines.
 636           * The reason is described below.
 637           */
 638          enlist(csp->headers, "");
 639          continue_hack_in_da_house = 0;
 640          continue;
 641       }
 642       else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
 643       {
 644          /*
 645           * It's a bodyless continue response, don't
 646           * stop header parsing after reaching its end.
 647           *
 648           * As a result Privoxy will concatenate the
 649           * next response's head and parse and deliver
 650           * the headers as if they belonged to one request.
 651           *
 652           * The client will separate them because of the
 653           * empty line between them.
 654           *
 655           * XXX: What we're doing here is clearly against
 656           * the intended purpose of the continue header,
 657           * and under some conditions (HTTP/1.0 client request)
 658           * it's a standard violation.
 659           *
 660           * Anyway, "sort of against the spec" is preferable
 661           * to "always getting confused by Continue responses"
 662           * (Privoxy's behaviour before this hack was added)
 663           */
 664          log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
 665          continue_hack_in_da_house = 1;
 666       }
 667       else if (*header == '\0')
 668       {
 669          /*
 670           * If the header is empty, but the Continue hack
 671           * isn't active, we can assume that we reached the
 672           * end of the buffer before we hit the end of the
 673           * head.
 674           *
 675           * Inform the caller an let it decide how to handle it.
 676           */
 677          return JB_ERR_PARSE;
 678       }
 679
 680       if (JB_ERR_MEMORY == enlist(csp->headers, header))
 681       {
 682          /*
 683           * XXX: Should we quit the request and return a
 684           * out of memory error page instead?
 685           */
 686          log_error(LOG_LEVEL_ERROR,
 687             "Out of memory while enlisting server headers. %s lost.",
 688             header);
 689       }
 690       freez(header);
 691    }
 692
 693    return JB_ERR_OK;
 694 }
 695
 696
 697 /*********************************************************************
 698  *
 699  * Function    :  crunch_reason
 700  *
 701  * Description :  Translates the crunch reason code into a string.
 702  *
 703  * Parameters  :
 704  *          1  :  rsp = a http_response
 705  *
 706  * Returns     :  A string with the crunch reason or an error description.
 707  *
 708  *********************************************************************/
 709 static const char *crunch_reason(const struct http_response *rsp)
 710 {
 711    char * reason = NULL;
 712
 713    assert(rsp != NULL);
 714    if (rsp == NULL)
 715    {
 716       return "Internal error while searching for crunch reason";
 717    }
 718
 719    switch (rsp->crunch_reason)
 720    {
 721       case UNSUPPORTED:
 722          reason = "Unsupported HTTP feature";
 723          break;
 724       case BLOCKED:
 725          reason = "Blocked";
 726          break;
 727       case UNTRUSTED:
 728          reason = "Untrusted";
 729          break;
 730       case REDIRECTED:
 731          reason = "Redirected";
 732          break;
 733       case CGI_CALL:
 734          reason = "CGI Call";
 735          break;
 736       case NO_SUCH_DOMAIN:
 737          reason = "DNS failure";
 738          break;
 739       case FORWARDING_FAILED:
 740          reason = "Forwarding failed";
 741          break;
 742       case CONNECT_FAILED:
 743          reason = "Connection failure";
 744          break;
 745       case OUT_OF_MEMORY:
 746          reason = "Out of memory (may mask other reasons)";
 747          break;
 748       case CONNECTION_TIMEOUT:
 749          reason = "Connection timeout";
 750          break;
 751       case NO_SERVER_DATA:
 752          reason = "No server data received";
 753          break;
 754       default:
 755          reason = "No reason recorded";
 756          break;
 757    }
 758
 759    return reason;
 760 }
 761
 762
 763 /*********************************************************************
 764  *
 765  * Function    :  log_applied_actions
 766  *
 767  * Description :  Logs the applied actions if LOG_LEVEL_ACTIONS is
 768  *                enabled.
 769  *
 770  * Parameters  :
 771  *          1  :  actions = Current action spec to log
 772  *
 773  * Returns     :  Nothing.
 774  *
 775  *********************************************************************/
 776 static void log_applied_actions(const struct current_action_spec *actions)
 777 {
 778    /*
 779     * The conversion to text requires lots of memory allocations so
 780     * we only do the conversion if the user is actually interested.
 781     */
 782    if (debug_level_is_enabled(LOG_LEVEL_ACTIONS))
 783    {
 784       char *actions_as_text = actions_to_line_of_text(actions);
 785       log_error(LOG_LEVEL_ACTIONS, "%s", actions_as_text);
 786       freez(actions_as_text);
 787    }
 788 }
 789
 790
 791 /*********************************************************************
 792  *
 793  * Function    :  send_crunch_response
 794  *
 795  * Description :  Delivers already prepared response for
 796  *                intercepted requests, logs the interception
 797  *                and frees the response.
 798  *
 799  * Parameters  :
 800  *          1  :  csp = Current client state (buffers, headers, etc...)
 801  *          2  :  rsp = Fully prepared response. Will be freed on exit.
 802  *
 803  * Returns     :  Nothing.
 804  *
 805  *********************************************************************/
 806 static void send_crunch_response(struct client_state *csp, struct http_response *rsp)
 807 {
 808       const struct http_request *http = csp->http;
 809       char status_code[4];
 810
 811       assert(rsp != NULL);
 812       assert(rsp->head != NULL);
 813
 814       if (rsp == NULL)
 815       {
 816          log_error(LOG_LEVEL_FATAL, "NULL response in send_crunch_response.");
 817       }
 818
 819       /*
 820        * Extract the status code from the actual head
 821        * that will be send to the client. It is the only
 822        * way to get it right for all requests, including
 823        * the fixed ones for out-of-memory problems.
 824        *
 825        * A head starts like this: 'HTTP/1.1 200...'
 826        *                           0123456789|11
 827        *                                     10
 828        */
 829       status_code[0] = rsp->head[9];
 830       status_code[1] = rsp->head[10];
 831       status_code[2] = rsp->head[11];
 832       status_code[3] = '\0';
 833
 834       /* Log that the request was crunched and why. */
 835       log_applied_actions(csp->action);
 836 #ifdef FEATURE_HTTPS_INSPECTION
 837       if (client_use_ssl(csp))
 838       {
 839          log_error(LOG_LEVEL_CRUNCH, "%s: https://%s%s", crunch_reason(rsp),
 840             http->hostport, http->path);
 841          log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s https://%s%s %s\" %s %lu",
 842             csp->ip_addr_str, http->gpc, http->hostport, http->path,
 843             http->version, status_code, rsp->content_length);
 844       }
 845       else
 846 #endif
 847       {
 848          log_error(LOG_LEVEL_CRUNCH, "%s: %s", crunch_reason(rsp), http->url);
 849          log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %lu",
 850             csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
 851       }
 852       /* Write the answer to the client */
 853 #ifdef FEATURE_HTTPS_INSPECTION
 854       if (client_use_ssl(csp))
 855       {
 856          if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
 857                 (const unsigned char *)rsp->head, rsp->head_length,
 858                 get_write_delay(csp)) < 0)
 859           || (ssl_send_data_delayed(&(csp->ssl_client_attr),
 860                 (const unsigned char *)rsp->body, rsp->content_length,
 861                 get_write_delay(csp)) < 0))
 862          {
 863             /* There is nothing we can do about it. */
 864             log_error(LOG_LEVEL_CONNECT, "Couldn't deliver the error message "
 865                "for https://%s%s through client socket %d using TLS/SSL",
 866                http->hostport, http->url, csp->cfd);
 867          }
 868       }
 869       else
 870 #endif
 871       {
 872          if (write_socket_delayed(csp->cfd, rsp->head, rsp->head_length,
 873                 get_write_delay(csp))
 874           || write_socket_delayed(csp->cfd, rsp->body, rsp->content_length,
 875                 get_write_delay(csp)))
 876          {
 877             /* There is nothing we can do about it. */
 878             log_error(LOG_LEVEL_CONNECT,
 879                "Couldn't deliver the error message for %s through client socket %d: %E",
 880                http->url, csp->cfd);
 881          }
 882       }
 883
 884       /* Clean up and return */
 885       if (cgi_error_memory() != rsp)
 886       {
 887          free_http_response(rsp);
 888       }
 889       return;
 890 }
 891
 892
 893 /*********************************************************************
 894  *
 895  * Function    :  crunch_response_triggered
 896  *
 897  * Description :  Checks if the request has to be crunched,
 898  *                and delivers the crunch response if necessary.
 899  *
 900  * Parameters  :
 901  *          1  :  csp = Current client state (buffers, headers, etc...)
 902  *          2  :  crunchers = list of cruncher functions to run
 903  *
 904  * Returns     :  TRUE if the request was answered with a crunch response
 905  *                FALSE otherwise.
 906  *
 907  *********************************************************************/
 908 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
 909 {
 910    struct http_response *rsp = NULL;
 911    const struct cruncher *c;
 912
 913    /*
 914     * If CGI request crunching is disabled,
 915     * check the CGI dispatcher out of order to
 916     * prevent unintentional blocks or redirects.
 917     */
 918    if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
 919        && (NULL != (rsp = dispatch_cgi(csp))))
 920    {
 921       /* Deliver, log and free the interception response. */
 922       send_crunch_response(csp, rsp);
 923       csp->flags |= CSP_FLAG_CRUNCHED;
 924       return TRUE;
 925    }
 926
 927    for (c = crunchers; c->cruncher != NULL; c++)
 928    {
 929       /*
 930        * Check the cruncher if either Privoxy is toggled
 931        * on and the request isn't forced, or if the cruncher
 932        * applies to forced requests as well.
 933        */
 934       if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
 935           !(csp->flags & CSP_FLAG_FORCED)) ||
 936           (c->flags & CF_IGNORE_FORCE))
 937       {
 938          rsp = c->cruncher(csp);
 939          if (NULL != rsp)
 940          {
 941             /* Deliver, log and free the interception response. */
 942             send_crunch_response(csp, rsp);
 943             csp->flags |= CSP_FLAG_CRUNCHED;
 944 #ifdef FEATURE_STATISTICS
 945             if (c->flags & CF_COUNT_AS_REJECT)
 946             {
 947                csp->flags |= CSP_FLAG_REJECTED;
 948             }
 949 #endif /* def FEATURE_STATISTICS */
 950
 951             return TRUE;
 952          }
 953       }
 954    }
 955
 956    return FALSE;
 957 }
 958
 959
 960 /*********************************************************************
 961  *
 962  * Function    :  build_request_line
 963  *
 964  * Description :  Builds the HTTP request line.
 965  *
 966  *                If a HTTP forwarder is used it expects the whole URL,
 967  *                web servers only get the path.
 968  *
 969  * Parameters  :
 970  *          1  :  csp = Current client state (buffers, headers, etc...)
 971  *          2  :  fwd = The forwarding spec used for the request.
 972  *                      Can be NULL.
 973  *          3  :  request_line = The old request line which will be replaced.
 974  *
 975  * Returns     :  Nothing. Terminates in case of memory problems.
 976  *
 977  *********************************************************************/
 978 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
 979 {
 980    struct http_request *http = csp->http;
 981
 982    /*
 983     * Downgrade http version from 1.1 to 1.0
 984     * if +downgrade action applies.
 985     */
 986    if ((csp->action->flags & ACTION_DOWNGRADE)
 987      && (!strcmpic(http->version, "HTTP/1.1")))
 988    {
 989       freez(http->version);
 990       http->version = strdup_or_die("HTTP/1.0");
 991    }
 992
 993    /*
 994     * Rebuild the request line.
 995     */
 996    freez(*request_line);
 997    *request_line = strdup(http->gpc);
 998    string_append(request_line, " ");
 999
1000    if (fwd != NULL && fwd->forward_host && fwd->type != FORWARD_WEBSERVER)
1001    {
1002       string_append(request_line, http->url);
1003    }
1004    else
1005    {
1006       string_append(request_line, http->path);
1007    }
1008    string_append(request_line, " ");
1009    string_append(request_line, http->version);
1010
1011    if (*request_line == NULL)
1012    {
1013       log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
1014    }
1015    log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
1016 }
1017
1018
1019 /*********************************************************************
1020  *
1021  * Function    :  change_request_destination
1022  *
1023  * Description :  Parse a (rewritten) request line and regenerate
1024  *                the http request data.
1025  *
1026  * Parameters  :
1027  *          1  :  csp = Current client state (buffers, headers, etc...)
1028  *
1029  * Returns     :  Forwards the parse_http_request() return code.
1030  *                Terminates in case of memory problems.
1031  *
1032  *********************************************************************/
1033 static jb_err change_request_destination(struct client_state *csp)
1034 {
1035    struct http_request *http = csp->http;
1036    jb_err err;
1037
1038    log_error(LOG_LEVEL_REDIRECTS, "Rewrite detected: %s",
1039       csp->headers->first->str);
1040    free_http_request(http);
1041    err = parse_http_request(csp->headers->first->str, http);
1042    if (JB_ERR_OK != err)
1043    {
1044       log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
1045          jb_err_to_string(err));
1046    }
1047    if (http->ssl && strcmpic(csp->http->gpc, "CONNECT"))
1048    {
1049       /*
1050        * A client header filter changed the request URL from
1051        * http:// to https:// which we currently don't support.
1052        */
1053       log_error(LOG_LEVEL_ERROR, "Changing the request destination from http "
1054          "to https behind the client's back currently isn't supported.");
1055       return JB_ERR_PARSE;
1056    }
1057
1058    return err;
1059 }
1060
1061
1062 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1063 /*********************************************************************
1064  *
1065  * Function    :  server_response_is_complete
1066  *
1067  * Description :  Determines whether we should stop reading
1068  *                from the server socket.
1069  *
1070  * Parameters  :
1071  *          1  :  csp = Current client state (buffers, headers, etc...)
1072  *          2  :  content_length = Length of content received so far.
1073  *
1074  * Returns     :  TRUE if the response is complete,
1075  *                FALSE otherwise.
1076  *
1077  *********************************************************************/
1078 static int server_response_is_complete(struct client_state *csp,
1079    unsigned long long content_length)
1080 {
1081    int content_length_known = !!(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET);
1082
1083    if (!strcmpic(csp->http->gpc, "HEAD"))
1084    {
1085       /*
1086        * "HEAD" implies no body, we are thus expecting
1087        * no content. XXX: incomplete "list" of methods?
1088        */
1089       csp->expected_content_length = 0;
1090       content_length_known = TRUE;
1091       csp->flags |= CSP_FLAG_SERVER_CONTENT_LENGTH_SET;
1092    }
1093
1094    if (csp->http->status == 204 || csp->http->status == 304)
1095    {
1096       /*
1097        * Expect no body. XXX: incomplete "list" of status codes?
1098        */
1099       csp->expected_content_length = 0;
1100       content_length_known = TRUE;
1101       csp->flags |= CSP_FLAG_SERVER_CONTENT_LENGTH_SET;
1102    }
1103
1104    return (content_length_known && ((0 == csp->expected_content_length)
1105             || (csp->expected_content_length <= content_length)));
1106 }
1107
1108
1109 #ifdef FEATURE_CONNECTION_SHARING
1110 /*********************************************************************
1111  *
1112  * Function    :  wait_for_alive_connections
1113  *
1114  * Description :  Waits for alive connections to timeout.
1115  *
1116  * Parameters  :  N/A
1117  *
1118  * Returns     :  N/A
1119  *
1120  *********************************************************************/
1121 static void wait_for_alive_connections(void)
1122 {
1123    int connections_alive = close_unusable_connections();
1124
1125    while (0 < connections_alive)
1126    {
1127       log_error(LOG_LEVEL_CONNECT,
1128          "Waiting for %d connections to timeout.",
1129          connections_alive);
1130       sleep(60);
1131       connections_alive = close_unusable_connections();
1132    }
1133
1134    log_error(LOG_LEVEL_CONNECT, "No connections to wait for left.");
1135
1136 }
1137 #endif /* def FEATURE_CONNECTION_SHARING */
1138
1139
1140 /*********************************************************************
1141  *
1142  * Function    :  save_connection_destination
1143  *
1144  * Description :  Remembers a connection for reuse later on.
1145  *
1146  * Parameters  :
1147  *          1  :  sfd  = Open socket to remember.
1148  *          2  :  http = The destination for the connection.
1149  *          3  :  fwd  = The forwarder settings used.
1150  *          4  :  server_connection  = storage.
1151  *
1152  * Returns     : void
1153  *
1154  *********************************************************************/
1155 void save_connection_destination(jb_socket sfd,
1156                                  const struct http_request *http,
1157                                  const struct forward_spec *fwd,
1158                                  struct reusable_connection *server_connection)
1159 {
1160    assert(sfd != JB_INVALID_SOCKET);
1161    assert(NULL != http->host);
1162
1163    server_connection->sfd = sfd;
1164    server_connection->host = strdup_or_die(http->host);
1165    server_connection->port = http->port;
1166
1167    assert(NULL != fwd);
1168    assert(server_connection->gateway_host == NULL);
1169    assert(server_connection->gateway_port == 0);
1170    assert(server_connection->forwarder_type == 0);
1171    assert(server_connection->forward_host == NULL);
1172    assert(server_connection->forward_port == 0);
1173
1174    server_connection->forwarder_type = fwd->type;
1175    if (NULL != fwd->gateway_host)
1176    {
1177       server_connection->gateway_host = strdup_or_die(fwd->gateway_host);
1178    }
1179    else
1180    {
1181       server_connection->gateway_host = NULL;
1182    }
1183    server_connection->gateway_port = fwd->gateway_port;
1184    if (NULL != fwd->auth_username)
1185    {
1186       server_connection->auth_username = strdup_or_die(fwd->auth_username);
1187    }
1188    else
1189    {
1190       server_connection->auth_username = NULL;
1191    }
1192    if (NULL != fwd->auth_password)
1193    {
1194       server_connection->auth_password = strdup_or_die(fwd->auth_password);
1195    }
1196    else
1197    {
1198       server_connection->auth_password = NULL;
1199    }
1200
1201    if (NULL != fwd->forward_host)
1202    {
1203       server_connection->forward_host = strdup_or_die(fwd->forward_host);
1204    }
1205    else
1206    {
1207       server_connection->forward_host = NULL;
1208    }
1209    server_connection->forward_port = fwd->forward_port;
1210 }
1211 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
1212
1213
1214 /*********************************************************************
1215  *
1216  * Function    : verify_request_length
1217  *
1218  * Description : Checks if we already got the whole client requests
1219  *               and sets CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ if
1220  *               we do.
1221  *
1222  *               Data that doesn't belong to the current request is
1223  *               either thrown away to let the client retry on a clean
1224  *               socket, or stashed to be dealt with after the current
1225  *               request is served.
1226  *
1227  * Parameters  :
1228  *          1  :  csp = Current client state (buffers, headers, etc...)
1229  *
1230  * Returns     :  void
1231  *
1232  *********************************************************************/
1233 static void verify_request_length(struct client_state *csp)
1234 {
1235    unsigned long long buffered_request_bytes =
1236       (unsigned long long)(csp->client_iob->eod - csp->client_iob->cur);
1237
1238    if ((csp->expected_client_content_length != 0)
1239       && (buffered_request_bytes != 0))
1240    {
1241       if (csp->expected_client_content_length >= buffered_request_bytes)
1242       {
1243          csp->expected_client_content_length -= buffered_request_bytes;
1244          log_error(LOG_LEVEL_CONNECT, "Reduced expected bytes to %llu "
1245             "to account for the %llu ones we already got.",
1246             csp->expected_client_content_length, buffered_request_bytes);
1247       }
1248       else
1249       {
1250          assert(csp->client_iob->eod > csp->client_iob->cur + csp->expected_client_content_length);
1251          csp->client_iob->eod = csp->client_iob->cur + csp->expected_client_content_length;
1252          log_error(LOG_LEVEL_CONNECT, "Reducing expected bytes to 0. "
1253             "Marking the server socket tainted after throwing %llu bytes away.",
1254             buffered_request_bytes - csp->expected_client_content_length);
1255          csp->expected_client_content_length = 0;
1256          csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1257       }
1258
1259       if (csp->expected_client_content_length == 0)
1260       {
1261          csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1262       }
1263    }
1264
1265    if (!(csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ)
1266       && ((csp->client_iob->cur < csp->client_iob->eod)
1267          || (csp->expected_client_content_length != 0)))
1268    {
1269       if (strcmpic(csp->http->gpc, "GET")
1270          && strcmpic(csp->http->gpc, "HEAD")
1271          && strcmpic(csp->http->gpc, "TRACE")
1272          && strcmpic(csp->http->gpc, "OPTIONS")
1273          && strcmpic(csp->http->gpc, "DELETE"))
1274       {
1275          /* XXX: this is an incomplete hack */
1276          csp->flags &= ~CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1277          log_error(LOG_LEVEL_CONNECT, "There better be a request body.");
1278       }
1279       else
1280       {
1281          csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1282
1283          if ((csp->config->feature_flags & RUNTIME_FEATURE_TOLERATE_PIPELINING) == 0)
1284          {
1285             csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1286             log_error(LOG_LEVEL_CONNECT,
1287                "Possible pipeline attempt detected. The connection will not "
1288                "be kept alive and we will only serve the first request.");
1289             /* Nuke the pipelined requests from orbit, just to be sure. */
1290             clear_iob(csp->client_iob);
1291          }
1292          else
1293          {
1294             /*
1295              * Keep the pipelined data around for now, we'll deal with
1296              * it once we're done serving the current request.
1297              */
1298             csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
1299             assert(csp->client_iob->eod >= csp->client_iob->cur);
1300             log_error(LOG_LEVEL_CONNECT, "Complete client request followed by "
1301                "%d bytes of pipelined data received.",
1302                (int)(csp->client_iob->eod - csp->client_iob->cur));
1303          }
1304       }
1305    }
1306    else
1307    {
1308       csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1309       log_error(LOG_LEVEL_CONNECT, "Complete client request received.");
1310    }
1311 }
1312
1313
1314 /*********************************************************************
1315  *
1316  * Function    :  mark_server_socket_tainted
1317  *
1318  * Description :  Makes sure we don't reuse a server socket
1319  *                (if we didn't read everything the server sent
1320  *                us reusing the socket would lead to garbage).
1321  *
1322  * Parameters  :
1323  *          1  :  csp = Current client state (buffers, headers, etc...)
1324  *
1325  * Returns     :  void.
1326  *
1327  *********************************************************************/
1328 static void mark_server_socket_tainted(struct client_state *csp)
1329 {
1330    /*
1331     * For consistency we always mark the server socket
1332     * tainted, however, to reduce the log noise we only
1333     * emit a log message if the server socket could have
1334     * actually been reused.
1335     */
1336    if ((csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE)
1337       && !(csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED))
1338    {
1339       log_error(LOG_LEVEL_CONNECT,
1340          "Marking the server socket %d tainted.",
1341          csp->server_connection.sfd);
1342    }
1343    csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1344 }
1345
1346 /*********************************************************************
1347  *
1348  * Function    :  get_request_line
1349  *
1350  * Description : Read the client request line.
1351  *
1352  * Parameters  :
1353  *          1  :  csp = Current client state (buffers, headers, etc...)
1354  *
1355  * Returns     :  Pointer to request line or NULL in case of errors.
1356  *
1357  *********************************************************************/
1358 static char *get_request_line(struct client_state *csp)
1359 {
1360    char buf[BUFFER_SIZE];
1361    char *request_line = NULL;
1362    int len;
1363
1364    memset(buf, 0, sizeof(buf));
1365
1366    if ((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) != 0)
1367    {
1368       /*
1369        * If there are multiple pipelined requests waiting,
1370        * the flag will be set again once the next request
1371        * has been parsed.
1372        */
1373       csp->flags &= ~CSP_FLAG_PIPELINED_REQUEST_WAITING;
1374
1375       request_line = get_header(csp->client_iob);
1376       if ((NULL != request_line) && ('\0' != *request_line))
1377       {
1378          return request_line;
1379       }
1380       else
1381       {
1382          log_error(LOG_LEVEL_CONNECT, "No complete request line "
1383             "received yet. Continuing reading from %d.", csp->cfd);
1384       }
1385    }
1386
1387    do
1388    {
1389       if (
1390 #ifdef FUZZ
1391           0 == (csp->flags & CSP_FLAG_FUZZED_INPUT) &&
1392 #endif
1393           !data_is_available(csp->cfd, csp->config->socket_timeout)
1394           )
1395       {
1396          if (socket_is_still_alive(csp->cfd))
1397          {
1398             log_error(LOG_LEVEL_CONNECT,
1399                "No request line on socket %d received in time. Timeout: %d.",
1400                csp->cfd, csp->config->socket_timeout);
1401             write_socket_delayed(csp->cfd, CLIENT_CONNECTION_TIMEOUT_RESPONSE,
1402                strlen(CLIENT_CONNECTION_TIMEOUT_RESPONSE),
1403                get_write_delay(csp));
1404          }
1405          else
1406          {
1407             log_error(LOG_LEVEL_CONNECT,
1408                "The client side of the connection on socket %d got "
1409                "closed without sending a complete request line.", csp->cfd);
1410          }
1411          return NULL;
1412       }
1413
1414       len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1415
1416       if (len <= 0) return NULL;
1417
1418       /*
1419        * If there is no memory left for buffering the
1420        * request, there is nothing we can do but hang up
1421        */
1422       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1423       {
1424          return NULL;
1425       }
1426
1427       request_line = get_header(csp->client_iob);
1428
1429    } while ((NULL != request_line) && ('\0' == *request_line));
1430
1431    return request_line;
1432
1433 }
1434
1435 enum chunk_status
1436 {
1437    CHUNK_STATUS_MISSING_DATA,
1438    CHUNK_STATUS_BODY_COMPLETE,
1439    CHUNK_STATUS_PARSE_ERROR
1440 };
1441
1442
1443 /*********************************************************************
1444  *
1445  * Function    :  chunked_body_is_complete
1446  *
1447  * Description :  Figures out whether or not a chunked body is complete.
1448  *
1449  *                Currently it always starts at the beginning of the
1450  *                buffer which is somewhat wasteful and prevents Privoxy
1451  *                from starting to forward the correctly parsed chunks
1452  *                as soon as theoretically possible.
1453  *
1454  *                Should be modified to work with a common buffer,
1455  *                and allow the caller to skip already parsed chunks.
1456  *
1457  *                This would allow the function to be used for unbuffered
1458  *                response bodies as well.
1459  *
1460  * Parameters  :
1461  *          1  :  iob = Buffer with the body to check.
1462  *          2  :  length = Length of complete body
1463  *
1464  * Returns     :  Enum with the result of the check.
1465  *
1466  *********************************************************************/
1467 static enum chunk_status chunked_body_is_complete(struct iob *iob, size_t *length)
1468 {
1469    unsigned int chunksize;
1470    char *p = iob->cur;
1471
1472    do
1473    {
1474       /*
1475        * We need at least a single digit, followed by "\r\n",
1476        * followed by an unknown amount of data, followed by "\r\n".
1477        */
1478       if (p + 5 > iob->eod)
1479       {
1480          return CHUNK_STATUS_MISSING_DATA;
1481       }
1482       if (sscanf(p, "%x", &chunksize) != 1)
1483       {
1484          return CHUNK_STATUS_PARSE_ERROR;
1485       }
1486
1487       /*
1488        * We want at least a single digit, followed by "\r\n",
1489        * followed by the specified amount of data, followed by "\r\n".
1490        */
1491       if (p + chunksize + 5 > iob->eod)
1492       {
1493          return CHUNK_STATUS_MISSING_DATA;
1494       }
1495
1496       /* Skip chunk-size. */
1497       p = strstr(p, "\r\n");
1498       if (NULL == p)
1499       {
1500          return CHUNK_STATUS_PARSE_ERROR;
1501       }
1502       /* Move beyond the chunkdata. */
1503       p += 2 + chunksize;
1504
1505       /* There should be another "\r\n" to skip */
1506       if (memcmp(p, "\r\n", 2))
1507       {
1508          return CHUNK_STATUS_PARSE_ERROR;
1509       }
1510       p += 2;
1511    } while (chunksize > 0U);
1512
1513    *length = (size_t)(p - iob->cur);
1514    assert(*length <= (size_t)(iob->eod - iob->cur));
1515    assert(p <= iob->eod);
1516
1517    return CHUNK_STATUS_BODY_COMPLETE;
1518
1519 }
1520
1521
1522 /*********************************************************************
1523  *
1524  * Function    : receive_chunked_client_request_body
1525  *
1526  * Description : Read the chunk-encoded client request body.
1527  *               Failures are dealt with.
1528  *
1529  * Parameters  :
1530  *          1  :  csp = Current client state (buffers, headers, etc...)
1531  *
1532  * Returns     :  JB_ERR_OK or JB_ERR_PARSE
1533  *
1534  *********************************************************************/
1535 static jb_err receive_chunked_client_request_body(struct client_state *csp)
1536 {
1537    size_t body_length;
1538    enum chunk_status status;
1539
1540    while (CHUNK_STATUS_MISSING_DATA ==
1541       (status = chunked_body_is_complete(csp->client_iob, &body_length)))
1542    {
1543       char buf[BUFFER_SIZE];
1544       int len;
1545
1546       if (!data_is_available(csp->cfd, csp->config->socket_timeout))
1547       {
1548          log_error(LOG_LEVEL_ERROR,
1549             "Timeout while waiting for the client body.");
1550          break;
1551       }
1552       len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1553       if (len <= 0)
1554       {
1555          log_error(LOG_LEVEL_ERROR, "Read the client body failed: %E");
1556          break;
1557       }
1558       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1559       {
1560          break;
1561       }
1562    }
1563    if (status != CHUNK_STATUS_BODY_COMPLETE)
1564    {
1565       write_socket_delayed(csp->cfd, CLIENT_BODY_PARSE_ERROR_RESPONSE,
1566          strlen(CLIENT_BODY_PARSE_ERROR_RESPONSE), get_write_delay(csp));
1567       log_error(LOG_LEVEL_CLF,
1568          "%s - - [%T] \"Failed reading chunked client body\" 400 0", csp->ip_addr_str);
1569       return JB_ERR_PARSE;
1570    }
1571    log_error(LOG_LEVEL_CONNECT,
1572       "Chunked client body completely read. Length: %lu", body_length);
1573    csp->expected_client_content_length = body_length;
1574
1575    return JB_ERR_OK;
1576
1577 }
1578
1579
1580 #ifdef FUZZ
1581 /*********************************************************************
1582  *
1583  * Function    :  fuzz_chunked_transfer_encoding
1584  *
1585  * Description :  Treat the fuzzed input as chunked transfer encoding
1586  *                to check and dechunk.
1587  *
1588  * Parameters  :
1589  *          1  :  csp      = Used to store the data.
1590  *          2  :  fuzz_input_file = File to read the input from.
1591  *
1592  * Returns     : Result of dechunking
1593  *
1594  *********************************************************************/
1595 extern int fuzz_chunked_transfer_encoding(struct client_state *csp, char *fuzz_input_file)
1596 {
1597    size_t length;
1598    size_t size = (size_t)(csp->iob->eod - csp->iob->cur);
1599    enum chunk_status status;
1600
1601    status = chunked_body_is_complete(csp->iob, &length);
1602    if (CHUNK_STATUS_BODY_COMPLETE != status)
1603    {
1604       log_error(LOG_LEVEL_INFO, "Chunked body is incomplete or invalid");
1605    }
1606
1607    return (JB_ERR_OK == remove_chunked_transfer_coding(csp->iob->cur, &size));
1608
1609 }
1610
1611
1612 /*********************************************************************
1613  *
1614  * Function    : fuzz_client_request
1615  *
1616  * Description : Try to get a client request from the fuzzed input.
1617  *
1618  * Parameters  :
1619  *          1  :  csp = Current client state (buffers, headers, etc...)
1620  *          2  :  fuzz_input_file = File to read the input from.
1621  *
1622  * Returns     :  Result of fuzzing.
1623  *
1624  *********************************************************************/
1625 extern int fuzz_client_request(struct client_state *csp, char *fuzz_input_file)
1626 {
1627    jb_err err;
1628
1629    csp->cfd = 0;
1630    csp->ip_addr_str = "fuzzer";
1631
1632    if (strcmp(fuzz_input_file, "-") != 0)
1633    {
1634       log_error(LOG_LEVEL_FATAL,
1635          "Fuzzed client requests can currently only be read from stdin (-).");
1636    }
1637    err = receive_client_request(csp);
1638    if (err != JB_ERR_OK)
1639    {
1640       return 1;
1641    }
1642    err = parse_client_request(csp);
1643    if (err != JB_ERR_OK)
1644    {
1645       return 1;
1646    }
1647
1648    return 0;
1649
1650 }
1651 #endif  /* def FUZZ */
1652
1653
1654 #ifdef FEATURE_FORCE_LOAD
1655 /*********************************************************************
1656  *
1657  * Function    :  force_required
1658  *
1659  * Description : Checks a request line to see if it contains
1660  *               the FORCE_PREFIX. If it does, it is removed
1661  *               unless enforcing requests has beend disabled.
1662  *
1663  * Parameters  :
1664  *          1  :  request_line = HTTP request line
1665  *
1666  * Returns     :  TRUE if force is required, FALSE otherwise.
1667  *
1668  *********************************************************************/
1669 static int force_required(const struct client_state *csp, char *request_line)
1670 {
1671    char *p;
1672
1673    p = strstr(request_line, "http://");
1674    if (p != NULL)
1675    {
1676       /* Skip protocol */
1677       p += strlen("http://");
1678    }
1679    else
1680    {
1681       /* Intercepted request usually don't specify the protocol. */
1682       p = request_line;
1683    }
1684
1685    /* Go to the beginning of the path */
1686    p = strstr(p, "/");
1687    if (p == NULL)
1688    {
1689       /*
1690        * If the path is missing the request line is invalid and we
1691        * are done here. The client-visible rejection happens later on.
1692        */
1693       return 0;
1694    }
1695
1696    if (0 == strncmpic(p, FORCE_PREFIX, strlen(FORCE_PREFIX) - 1))
1697    {
1698       if (!(csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS))
1699       {
1700          /* XXX: Should clean more carefully */
1701          strclean(request_line, FORCE_PREFIX);
1702          log_error(LOG_LEVEL_FORCE,
1703             "Enforcing request: \"%s\".", request_line);
1704
1705          return 1;
1706       }
1707       log_error(LOG_LEVEL_FORCE,
1708          "Ignored force prefix in request: \"%s\".", request_line);
1709    }
1710
1711    return 0;
1712
1713 }
1714 #endif /* def FEATURE_FORCE_LOAD */
1715
1716
1717 /*********************************************************************
1718  *
1719  * Function    :  receive_client_request
1720  *
1721  * Description : Read the client's request (more precisely the
1722  *               client headers) and answer it if necessary.
1723  *
1724  * Parameters  :
1725  *          1  :  csp = Current client state (buffers, headers, etc...)
1726  *
1727  * Returns     :  JB_ERR_OK, JB_ERR_PARSE or JB_ERR_MEMORY
1728  *
1729  *********************************************************************/
1730 static jb_err receive_client_request(struct client_state *csp)
1731 {
1732    char buf[BUFFER_SIZE];
1733    char *p;
1734    char *req = NULL;
1735    struct http_request *http;
1736    int len;
1737    jb_err err;
1738
1739    /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1740    struct list header_list;
1741    struct list *headers = &header_list;
1742
1743    /* We don't care if the arriving data is a valid HTTP request or not. */
1744    csp->requests_received_total++;
1745
1746    http = csp->http;
1747
1748    memset(buf, 0, sizeof(buf));
1749
1750    req = get_request_line(csp);
1751    if (req == NULL)
1752    {
1753       mark_server_socket_tainted(csp);
1754       return JB_ERR_PARSE;
1755    }
1756    assert(*req != '\0');
1757
1758    if (client_protocol_is_unsupported(csp, req))
1759    {
1760       return JB_ERR_PARSE;
1761    }
1762
1763 #ifdef FEATURE_FORCE_LOAD
1764    if (force_required(csp, req))
1765    {
1766       csp->flags |= CSP_FLAG_FORCED;
1767    }
1768 #endif /* def FEATURE_FORCE_LOAD */
1769
1770    err = parse_http_request(req, http);
1771    freez(req);
1772    if (JB_ERR_OK != err)
1773    {
1774       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER),
1775          get_write_delay(csp));
1776       /* XXX: Use correct size */
1777       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1778       log_error(LOG_LEVEL_ERROR,
1779          "Couldn't parse request line received from %s: %s",
1780          csp->ip_addr_str, jb_err_to_string(err));
1781
1782       free_http_request(http);
1783       return JB_ERR_PARSE;
1784    }
1785
1786    /* grab the rest of the client's headers */
1787    init_list(headers);
1788    for (;;)
1789    {
1790       p = get_header(csp->client_iob);
1791
1792       if (p == NULL)
1793       {
1794          /* There are no additional headers to read. */
1795          break;
1796       }
1797
1798       if (*p == '\0')
1799       {
1800          /*
1801           * We didn't receive a complete header
1802           * line yet, get the rest of it.
1803           */
1804          if (!data_is_available(csp->cfd, csp->config->socket_timeout))
1805          {
1806             log_error(LOG_LEVEL_ERROR,
1807                "Stopped grabbing the client headers.");
1808             destroy_list(headers);
1809             return JB_ERR_PARSE;
1810          }
1811
1812          len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1813          if (len <= 0)
1814          {
1815             log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
1816             destroy_list(headers);
1817             return JB_ERR_PARSE;
1818          }
1819
1820          if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1821          {
1822             /*
1823              * If there is no memory left for buffering the
1824              * request, there is nothing we can do but hang up
1825              */
1826             destroy_list(headers);
1827             return JB_ERR_MEMORY;
1828          }
1829       }
1830       else
1831       {
1832          if (!strncmpic(p, "Transfer-Encoding:", 18))
1833          {
1834             /*
1835              * XXX: should be called through sed()
1836              *      but currently can't.
1837              */
1838             client_transfer_encoding(csp, &p);
1839          }
1840          /*
1841           * We were able to read a complete
1842           * header and can finally enlist it.
1843           */
1844          enlist(headers, p);
1845          freez(p);
1846       }
1847    }
1848
1849    if (http->host == NULL)
1850    {
1851       /*
1852        * If we still don't know the request destination,
1853        * the request is invalid or the client uses
1854        * Privoxy without its knowledge.
1855        */
1856       if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
1857       {
1858          /*
1859           * Our attempts to get the request destination
1860           * elsewhere failed or Privoxy is configured
1861           * to only accept proxy requests.
1862           *
1863           * An error response has already been send
1864           * and we're done here.
1865           */
1866          return JB_ERR_PARSE;
1867       }
1868    }
1869
1870 #ifdef FEATURE_CLIENT_TAGS
1871    /* XXX: If the headers were enlisted sooner, passing csp would do. */
1872    set_client_address(csp, headers);
1873    get_tag_list_for_client(csp->client_tags, csp->client_address);
1874 #endif
1875
1876    /*
1877     * Determine the actions for this URL
1878     */
1879 #ifdef FEATURE_TOGGLE
1880    if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
1881    {
1882       /* Most compatible set of actions (i.e. none) */
1883       init_current_action(csp->action);
1884    }
1885    else
1886 #endif /* ndef FEATURE_TOGGLE */
1887    {
1888       get_url_actions(csp, http);
1889    }
1890
1891    enlist(csp->headers, http->cmd);
1892
1893    /* Append the previously read headers */
1894    err = list_append_list_unique(csp->headers, headers);
1895    destroy_list(headers);
1896
1897    return err;
1898
1899 }
1900
1901
1902 /*********************************************************************
1903  *
1904  * Function    : parse_client_request
1905  *
1906  * Description : Parses the client's request and decides what to do
1907  *               with it.
1908  *
1909  *               Note that since we're not using select() we could get
1910  *               blocked here if a client connected, then didn't say
1911  *               anything!
1912  *
1913  * Parameters  :
1914  *          1  :  csp = Current client state (buffers, headers, etc...)
1915  *
1916  * Returns     :  JB_ERR_OK or JB_ERR_PARSE
1917  *
1918  *********************************************************************/
1919 static jb_err parse_client_request(struct client_state *csp)
1920 {
1921    struct http_request *http = csp->http;
1922    jb_err err;
1923
1924 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1925    if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
1926     && (!strcmpic(csp->http->version, "HTTP/1.1"))
1927     && (csp->http->ssl == 0))
1928    {
1929       /* Assume persistence until further notice */
1930       csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
1931    }
1932 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
1933
1934    if (csp->http->ssl == 0)
1935    {
1936       /*
1937        * This whole block belongs to chat() but currently
1938        * has to be executed before sed().
1939        */
1940       if (csp->flags & CSP_FLAG_CHUNKED_CLIENT_BODY)
1941       {
1942          if (receive_chunked_client_request_body(csp) != JB_ERR_OK)
1943          {
1944             return JB_ERR_PARSE;
1945          }
1946       }
1947       else
1948       {
1949          csp->expected_client_content_length = get_expected_content_length(csp->headers);
1950       }
1951       verify_request_length(csp);
1952    }
1953 #ifndef FEATURE_HTTPS_INSPECTION
1954    else
1955    {
1956       csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1957    }
1958 #endif
1959
1960    err = sed(csp, FILTER_CLIENT_HEADERS);
1961    if (JB_ERR_OK != err)
1962    {
1963       log_error(LOG_LEVEL_ERROR, "Failed to parse client request from %s.",
1964          csp->ip_addr_str);
1965       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1966          csp->ip_addr_str, csp->http->cmd);
1967       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER), get_write_delay(csp));
1968       return JB_ERR_PARSE;
1969    }
1970    csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
1971
1972    /* Check request line for rewrites. */
1973    if ((NULL == csp->headers->first->str)
1974       || (strcmp(http->cmd, csp->headers->first->str) &&
1975          (JB_ERR_OK != change_request_destination(csp))))
1976    {
1977       /*
1978        * A header filter broke the request line - bail out.
1979        */
1980       write_socket_delayed(csp->cfd, MESSED_UP_REQUEST_RESPONSE,
1981          strlen(MESSED_UP_REQUEST_RESPONSE), get_write_delay(csp));
1982       /* XXX: Use correct size */
1983       log_error(LOG_LEVEL_CLF,
1984          "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
1985       log_error(LOG_LEVEL_ERROR,
1986          "Invalid request line after applying header filters.");
1987       free_http_request(http);
1988
1989       return JB_ERR_PARSE;
1990    }
1991
1992    if (client_has_unsupported_expectations(csp))
1993    {
1994       return JB_ERR_PARSE;
1995    }
1996
1997    return JB_ERR_OK;
1998
1999 }
2000
2001
2002 /*********************************************************************
2003  *
2004  * Function    : read_http_request_body
2005  *
2006  * Description : Reads remaining request body from the client.
2007  *
2008  * Parameters  :
2009  *          1  :  csp = Current client state (buffers, headers, etc...)
2010  *
2011  * Returns     :  0 on success, anything else is an error.
2012  *
2013  *********************************************************************/
2014 static int read_http_request_body(struct client_state *csp)
2015 {
2016    size_t to_read = csp->expected_client_content_length;
2017    int len;
2018
2019    assert(to_read != 0);
2020
2021    /* check if all data has been already read */
2022    if (to_read <= (csp->client_iob->eod - csp->client_iob->cur))
2023    {
2024       return 0;
2025    }
2026
2027    for (to_read -= (size_t)(csp->client_iob->eod - csp->client_iob->cur);
2028         to_read > 0 && data_is_available(csp->cfd, csp->config->socket_timeout);
2029         to_read -= (unsigned)len)
2030    {
2031       char buf[BUFFER_SIZE];
2032       size_t max_bytes_to_read = to_read < sizeof(buf) ? to_read : sizeof(buf);
2033
2034       log_error(LOG_LEVEL_CONNECT,
2035          "Waiting for up to %d bytes of request body from the client.",
2036          max_bytes_to_read);
2037       len = read_socket(csp->cfd, buf, (int)max_bytes_to_read);
2038       if (len <= -1)
2039       {
2040          log_error(LOG_LEVEL_CONNECT, "Failed receiving request body from %s: %E", csp->ip_addr_str);
2041          return 1;
2042       }
2043       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, (char *)buf, len))
2044       {
2045          return 1;
2046       }
2047       assert(to_read >= len);
2048    }
2049
2050    if (to_read != 0)
2051    {
2052       log_error(LOG_LEVEL_CONNECT, "Not enough request body has been read: expected %d more bytes",
2053          csp->expected_client_content_length);
2054       return 1;
2055    }
2056    log_error(LOG_LEVEL_CONNECT, "The last %d bytes of the request body have been read",
2057       csp->expected_client_content_length);
2058    return 0;
2059 }
2060
2061
2062 /*********************************************************************
2063  *
2064  * Function    : update_client_headers
2065  *
2066  * Description : Updates the HTTP headers from the client request.
2067  *
2068  * Parameters  :
2069  *          1  :  csp = Current client state (buffers, headers, etc...)
2070  *          2  :  new_content_length = new content length value to set
2071  *
2072  * Returns     :  0 on success, anything else is an error.
2073  *
2074  *********************************************************************/
2075 static int update_client_headers(struct client_state *csp, size_t new_content_length)
2076 {
2077    static const char content_length[] = "Content-Length:";
2078    int updated = 0;
2079    struct list_entry *p;
2080
2081 #ifndef FEATURE_HTTPS_INSPECTION
2082    for (p = csp->headers->first;
2083 #else
2084    for (p = csp->http->client_ssl ? csp->https_headers->first : csp->headers->first;
2085 #endif
2086         !updated  && (p != NULL); p = p->next)
2087    {
2088       /* Header crunch()ed in previous run? -> ignore */
2089       if (p->str == NULL)
2090       {
2091          continue;
2092       }
2093
2094       /* Does the current parser handle this header? */
2095       if (0 == strncmpic(p->str, content_length, sizeof(content_length) - 1))
2096       {
2097          updated = (JB_ERR_OK == header_adjust_content_length((char **)&(p->str), new_content_length));
2098          if (!updated)
2099          {
2100             return 1;
2101          }
2102       }
2103    }
2104
2105    return !updated;
2106 }
2107
2108
2109 /*********************************************************************
2110  *
2111  * Function    : can_filter_request_body
2112  *
2113  * Description : Checks if the current request body can be stored in
2114  *               the client_iob without hitting buffer limit.
2115  *
2116  * Parameters  :
2117  *          1  : csp = Current client state (buffers, headers, etc...)
2118  *
2119  * Returns     : TRUE if the current request size do not exceed buffer limit
2120  *               FALSE otherwise.
2121  *
2122  *********************************************************************/
2123 static int can_filter_request_body(const struct client_state *csp)
2124 {
2125    if (!can_add_to_iob(csp->client_iob, csp->config->buffer_limit,
2126                        csp->expected_client_content_length))
2127    {
2128       log_error(LOG_LEVEL_INFO,
2129          "Not filtering request body from %s: buffer limit %d will be exceeded "
2130          "(content length %d)", csp->ip_addr_str, csp->config->buffer_limit,
2131          csp->expected_client_content_length);
2132       return FALSE;
2133    }
2134    return TRUE;
2135 }
2136
2137
2138 /*********************************************************************
2139  *
2140  * Function    : send_http_request
2141  *
2142  * Description : Sends the HTTP headers from the client request
2143  *               and all the body data that has already been received.
2144  *
2145  * Parameters  :
2146  *          1  :  csp = Current client state (buffers, headers, etc...)
2147  *
2148  * Returns     :  0 on success, anything else is an error.
2149  *
2150  *********************************************************************/
2151 static int send_http_request(struct client_state *csp)
2152 {
2153    char *hdr;
2154    int write_failure;
2155    const char *to_send;
2156    size_t to_send_len;
2157    int filter_client_body = csp->expected_client_content_length != 0 &&
2158       client_body_filters_enabled(csp->action) && can_filter_request_body(csp);
2159
2160    if (filter_client_body)
2161    {
2162       if (read_http_request_body(csp))
2163       {
2164          return 1;
2165       }
2166       to_send_len = csp->expected_client_content_length;
2167       to_send = execute_client_body_filters(csp, &to_send_len);
2168       if (to_send == NULL)
2169       {
2170          /* just flush client_iob */
2171          filter_client_body = FALSE;
2172       }
2173       else if (to_send_len != csp->expected_client_content_length &&
2174          update_client_headers(csp, to_send_len))
2175       {
2176          log_error(LOG_LEVEL_HEADER, "Error updating client headers");
2177          return 1;
2178       }
2179       csp->expected_client_content_length = 0;
2180    }
2181
2182    hdr = list_to_text(csp->headers);
2183    if (hdr == NULL)
2184    {
2185       /* FIXME Should handle error properly */
2186       log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2187    }
2188    list_remove_all(csp->headers);
2189
2190    /*
2191     * Write the client's (modified) header to the server
2192     * (along with anything else that may be in the buffer)
2193     */
2194    write_failure = 0 != write_socket(csp->server_connection.sfd, hdr, strlen(hdr));
2195    freez(hdr);
2196
2197    if (write_failure)
2198    {
2199       log_error(LOG_LEVEL_CONNECT, "Failed sending request headers to: %s: %E",
2200          csp->http->hostport);
2201       return 1;
2202    }
2203
2204    if (filter_client_body)
2205    {
2206       write_failure = 0 != write_socket(csp->server_connection.sfd, to_send, to_send_len);
2207       freez(to_send);
2208       if (write_failure)
2209       {
2210          log_error(LOG_LEVEL_CONNECT, "Failed sending filtered request body to: %s: %E",
2211             csp->http->hostport);
2212          return 1;
2213       }
2214    }
2215
2216    if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) == 0)
2217       && (flush_iob(csp->server_connection.sfd, csp->client_iob, 0) < 0))
2218    {
2219       log_error(LOG_LEVEL_CONNECT, "Failed sending request body to: %s: %E",
2220          csp->http->hostport);
2221       return 1;
2222    }
2223    return 0;
2224 }
2225
2226
2227 #ifdef FEATURE_HTTPS_INSPECTION
2228 /*********************************************************************
2229  *
2230  * Function    : read_https_request_body
2231  *
2232  * Description : Reads remaining request body from the client.
2233  *
2234  * Parameters  :
2235  *          1  :  csp = Current client state (buffers, headers, etc...)
2236  *
2237  * Returns     :  0 on success, anything else is an error.
2238  *
2239  *********************************************************************/
2240 static int read_https_request_body(struct client_state *csp)
2241 {
2242    size_t to_read = csp->expected_client_content_length;
2243    int len;
2244
2245    assert(to_read != 0);
2246
2247    /* check if all data has been already read */
2248    if (to_read <= (csp->client_iob->eod - csp->client_iob->cur))
2249    {
2250       return 0;
2251    }
2252
2253    for (to_read -= (size_t)(csp->client_iob->eod - csp->client_iob->cur);
2254         to_read > 0 && (is_ssl_pending(&(csp->ssl_client_attr)) ||
2255           data_is_available(csp->cfd, csp->config->socket_timeout));
2256         to_read -= (unsigned)len)
2257    {
2258       unsigned char buf[BUFFER_SIZE];
2259       size_t max_bytes_to_read = to_read < sizeof(buf) ? to_read : sizeof(buf);
2260
2261       log_error(LOG_LEVEL_CONNECT,
2262          "Waiting for up to %d bytes of request body from the client.",
2263          max_bytes_to_read);
2264       len = ssl_recv_data(&(csp->ssl_client_attr), buf,
2265          (unsigned)max_bytes_to_read);
2266       if (len <= 0)
2267       {
2268          log_error(LOG_LEVEL_CONNECT, "Failed receiving request body from %s", csp->ip_addr_str);
2269          return 1;
2270       }
2271       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, (char *)buf, len))
2272       {
2273          return 1;
2274       }
2275       assert(to_read >= len);
2276    }
2277
2278    if (to_read != 0)
2279    {
2280       log_error(LOG_LEVEL_CONNECT, "Not enough request body has been read: expected %d more bytes", to_read);
2281       return 1;
2282    }
2283
2284    log_error(LOG_LEVEL_CONNECT, "The last %d bytes of the request body have been read",
2285       csp->expected_client_content_length);
2286    return 0;
2287 }
2288
2289
2290 /*********************************************************************
2291  *
2292  * Function    : receive_and_send_encrypted_post_data
2293  *
2294  * Description : Reads remaining request body from the client and sends
2295  *               it to the server.
2296  *
2297  * Parameters  :
2298  *          1  :  csp = Current client state (buffers, headers, etc...)
2299  *
2300  * Returns     :  0 on success, anything else is an error.
2301  *
2302  *********************************************************************/
2303 static int receive_and_send_encrypted_post_data(struct client_state *csp)
2304 {
2305    int content_length_known = csp->expected_client_content_length != 0;
2306
2307    while (is_ssl_pending(&(csp->ssl_client_attr))
2308       || (content_length_known && csp->expected_client_content_length != 0))
2309    {
2310       unsigned char buf[BUFFER_SIZE];
2311       int len;
2312       int max_bytes_to_read = sizeof(buf);
2313
2314       if (content_length_known && csp->expected_client_content_length < sizeof(buf))
2315       {
2316          max_bytes_to_read = (int)csp->expected_client_content_length;
2317       }
2318       log_error(LOG_LEVEL_CONNECT,
2319          "Waiting for up to %d bytes of request body from the client.",
2320          max_bytes_to_read);
2321       len = ssl_recv_data(&(csp->ssl_client_attr), buf,
2322          (unsigned)max_bytes_to_read);
2323       if (len == -1)
2324       {
2325          return 1;
2326       }
2327       if (len == 0)
2328       {
2329          /* XXX: Does this actually happen? */
2330          break;
2331       }
2332       log_error(LOG_LEVEL_CONNECT, "Forwarding %d bytes of encrypted request body",
2333          len);
2334       len = ssl_send_data(&(csp->ssl_server_attr), buf, (size_t)len);
2335       if (len == -1)
2336       {
2337          return 1;
2338       }
2339       if (csp->expected_client_content_length != 0)
2340       {
2341          if (csp->expected_client_content_length >= len)
2342          {
2343             csp->expected_client_content_length -= (unsigned)len;
2344          }
2345          if (csp->expected_client_content_length == 0)
2346          {
2347             log_error(LOG_LEVEL_CONNECT, "Forwarded the last %d bytes", len);
2348             break;
2349          }
2350       }
2351    }
2352
2353    log_error(LOG_LEVEL_CONNECT, "Done forwarding encrypted request body");
2354
2355    return 0;
2356
2357 }
2358
2359
2360 /*********************************************************************
2361  *
2362  * Function    : send_https_request
2363  *
2364  * Description : Sends the HTTP headers from the client request
2365  *               and all the body data that has already been received.
2366  *
2367  * Parameters  :
2368  *          1  :  csp = Current client state (buffers, headers, etc...)
2369  *
2370  * Returns     :  0 on success, anything else is an error.
2371  *
2372  *********************************************************************/
2373 static int send_https_request(struct client_state *csp)
2374 {
2375    char *hdr;
2376    int ret;
2377    long flushed = 0;
2378    const char *to_send;
2379    size_t to_send_len;
2380    int filter_client_body = csp->expected_client_content_length != 0 &&
2381       client_body_filters_enabled(csp->action) && can_filter_request_body(csp);
2382
2383    if (filter_client_body)
2384    {
2385       if (read_https_request_body(csp))
2386       {
2387          return 1;
2388       }
2389       to_send_len = csp->expected_client_content_length;
2390       to_send = execute_client_body_filters(csp, &to_send_len);
2391       if (to_send == NULL)
2392       {
2393          /* just flush client_iob */
2394          filter_client_body = FALSE;
2395       }
2396       else if (to_send_len != csp->expected_client_content_length &&
2397          update_client_headers(csp, to_send_len))
2398       {
2399          log_error(LOG_LEVEL_HEADER, "Error updating client headers");
2400          return 1;
2401       }
2402       csp->expected_client_content_length = 0;
2403    }
2404
2405    hdr = list_to_text(csp->https_headers);
2406    if (hdr == NULL)
2407    {
2408       /* FIXME Should handle error properly */
2409       log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2410    }
2411    list_remove_all(csp->https_headers);
2412
2413    /*
2414     * Write the client's (modified) header to the server
2415     * (along with anything else that may be in the buffer)
2416     */
2417    ret = ssl_send_data(&(csp->ssl_server_attr),
2418       (const unsigned char *)hdr, strlen(hdr));
2419    freez(hdr);
2420
2421    if (ret < 0)
2422    {
2423       log_error(LOG_LEVEL_CONNECT,
2424          "Failed sending encrypted request headers to: %s: %E",
2425          csp->http->hostport);
2426       mark_server_socket_tainted(csp);
2427       return 1;
2428    }
2429
2430    if (filter_client_body)
2431    {
2432       ret = ssl_send_data(&(csp->ssl_server_attr), (const unsigned char *)to_send, to_send_len);
2433       freez(to_send);
2434       if (ret < 0)
2435       {
2436          log_error(LOG_LEVEL_CONNECT, "Failed sending filtered request body to: %s",
2437             csp->http->hostport);
2438          return 1;
2439       }
2440    }
2441
2442    if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) == 0)
2443       && ((flushed = ssl_flush_socket(&(csp->ssl_server_attr),
2444             csp->client_iob)) < 0))
2445    {
2446       log_error(LOG_LEVEL_CONNECT, "Failed sending request body to: %s: %E",
2447          csp->http->hostport);
2448       return 1;
2449    }
2450    if (flushed != 0 || csp->expected_client_content_length != 0)
2451    {
2452       if (csp->expected_client_content_length != 0)
2453       {
2454          if (csp->expected_client_content_length < flushed)
2455          {
2456             log_error(LOG_LEVEL_ERROR,
2457                "Flushed %ld bytes of request body while only expecting %llu",
2458                flushed, csp->expected_client_content_length);
2459             csp->expected_client_content_length = 0;
2460          }
2461          else
2462          {
2463             log_error(LOG_LEVEL_CONNECT,
2464                "Flushed %ld bytes of request body while expecting %llu",
2465                flushed, csp->expected_client_content_length);
2466             csp->expected_client_content_length -= (unsigned)flushed;
2467             if (receive_and_send_encrypted_post_data(csp))
2468             {
2469                return 1;
2470             }
2471          }
2472       }
2473       else
2474       {
2475          log_error(LOG_LEVEL_CONNECT,
2476             "Flushed %ld bytes of request body", flushed);
2477       }
2478    }
2479
2480    log_error(LOG_LEVEL_CONNECT, "Encrypted request sent");
2481
2482    return 0;
2483
2484 }
2485
2486
2487 /*********************************************************************
2488  *
2489  * Function    :  receive_encrypted_request
2490  *
2491  * Description :  Receives an encrypted request.
2492  *
2493  * Parameters  :
2494  *          1  :  csp = Current client state (buffers, headers, etc...)
2495  *
2496  * Returns     :  JB_ERR_OK on success,
2497  *                JB_ERR_PARSE or JB_ERR_MEMORY otherwise
2498  *
2499  *********************************************************************/
2500 static jb_err receive_encrypted_request(struct client_state *csp)
2501 {
2502    char buf[BUFFER_SIZE];
2503    int len;
2504    char *p;
2505
2506    do
2507    {
2508       log_error(LOG_LEVEL_HEADER, "Reading encrypted headers");
2509       if (!is_ssl_pending(&(csp->ssl_client_attr)) &&
2510           !data_is_available(csp->cfd, csp->config->socket_timeout))
2511       {
2512          log_error(LOG_LEVEL_CONNECT,
2513             "Socket %d timed out while waiting for client headers", csp->cfd);
2514          return JB_ERR_PARSE;
2515       }
2516       len = ssl_recv_data(&(csp->ssl_client_attr),
2517          (unsigned char *)buf, sizeof(buf));
2518       if (len == 0)
2519       {
2520          log_error(LOG_LEVEL_CONNECT,
2521             "Socket %d closed while waiting for client headers", csp->cfd);
2522          return JB_ERR_PARSE;
2523       }
2524       if (len == -1)
2525       {
2526          return JB_ERR_PARSE;
2527       }
2528       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
2529       {
2530          return JB_ERR_MEMORY;
2531       }
2532       p = strstr(csp->client_iob->cur, "\r\n\r\n");
2533    } while (p == NULL);
2534
2535    log_error(LOG_LEVEL_HEADER, "Encrypted headers received completely");
2536
2537    return JB_ERR_OK;
2538 }
2539
2540
2541 /*********************************************************************
2542  *
2543  * Function    :  change_encrypted_request_destination
2544  *
2545  * Description :  Parse a (rewritten) request line from an encrypted
2546  *                request and regenerate the http request data.
2547  *
2548  * Parameters  :
2549  *          1  :  csp = Current client state (buffers, headers, etc...)
2550  *
2551  * Returns     :  Forwards the parse_http_request() return code.
2552  *                Terminates in case of memory problems.
2553  *
2554  *********************************************************************/
2555 static jb_err change_encrypted_request_destination(struct client_state *csp)
2556 {
2557    jb_err err;
2558    char *original_host = csp->http->host;
2559
2560    log_error(LOG_LEVEL_REDIRECTS, "Rewrite detected: %s",
2561       csp->https_headers->first->str);
2562    csp->http->host = NULL;
2563    free_http_request(csp->http);
2564    err = parse_http_request(csp->https_headers->first->str, csp->http);
2565    if (JB_ERR_OK != err)
2566    {
2567       log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
2568          jb_err_to_string(err));
2569       return err;
2570    }
2571
2572    if (csp->http->host == NULL)
2573    {
2574       /*
2575        * The rewritten request line did not specify a host
2576        * which means we can use the original host specified
2577        * by the client.
2578        */
2579       csp->http->host = original_host;
2580       log_error(LOG_LEVEL_REDIRECTS, "Keeping the original host: %s",
2581          csp->http->host);
2582       /*
2583        * If the rewritten request line didn't contain a host
2584        * it also didn't contain a port so we can reuse the host
2585        * and set the port to 443.
2586        */
2587       freez(csp->http->hostport);
2588       csp->http->hostport = strdup_or_die(csp->http->host);
2589       csp->http->port = 443;
2590       /*
2591        * While the request line didn't mention it,
2592        * we're https-inspecting and want to speak TLS
2593        * with the server.
2594        */
2595       csp->http->server_ssl = 1;
2596       csp->http->ssl = 1;
2597    }
2598    else
2599    {
2600       /* The rewrite filter added a host so we can ditch the original */
2601       freez(original_host);
2602       csp->http->server_ssl = csp->http->ssl;
2603    }
2604
2605    csp->http->client_ssl = 1;
2606
2607    freez(csp->https_headers->first->str);
2608    build_request_line(csp, NULL, &csp->https_headers->first->str);
2609
2610    if (!server_use_ssl(csp))
2611    {
2612       log_error(LOG_LEVEL_REDIRECTS,
2613          "Rewritten request line results in downgrade to http");
2614       /*
2615        * Replace the unencryptd headers received with the
2616        * CONNECT request with the ones we received securely.
2617        */
2618       destroy_list(csp->headers);
2619       csp->headers->first = csp->https_headers->first;
2620       csp->headers->last  = csp->https_headers->last;
2621       csp->https_headers->first = NULL;
2622       csp->https_headers->last = NULL;
2623    }
2624
2625    return JB_ERR_OK;
2626
2627 }
2628
2629
2630 /*********************************************************************
2631  *
2632  * Function    :  process_encrypted_request
2633  *
2634  * Description :  Receives and parses an encrypted request.
2635  *
2636  * Parameters  :
2637  *          1  :  csp = Current client state (buffers, headers, etc...)
2638  *
2639  * Returns     :  JB_ERR_OK on success,
2640  *                JB_ERR_PARSE or JB_ERR_MEMORY otherwise
2641  *
2642  *********************************************************************/
2643 static jb_err process_encrypted_request(struct client_state *csp)
2644 {
2645    char *p;
2646    char *request_line;
2647    jb_err err;
2648    /* Temporary copy of the client's headers before they get enlisted in csp->https_headers */
2649    struct list header_list;
2650    struct list *headers = &header_list;
2651
2652    assert(csp->ssl_with_client_is_opened);
2653
2654 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2655    if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
2656    {
2657       csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2658    }
2659 #endif
2660    err = receive_encrypted_request(csp);
2661    if (err != JB_ERR_OK)
2662    {
2663       if (csp->client_iob->cur == NULL ||
2664           csp->client_iob->cur == csp->client_iob->eod)
2665       {
2666          /*
2667           * We did not receive any data, most likely because the
2668           * client is done. Don't log this as a parse failure.
2669           */
2670          return JB_ERR_PARSE;
2671       }
2672       /* XXX: Also used for JB_ERR_MEMORY */
2673       log_error(LOG_LEVEL_ERROR, "Failed to receive encrypted request: %s",
2674          jb_err_to_string(err));
2675       ssl_send_data_delayed(&(csp->ssl_client_attr),
2676          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2677       return err;
2678    }
2679
2680    /* We don't need get_request_line() because the whole HTTP head is buffered. */
2681    request_line = get_header(csp->client_iob);
2682    if (request_line == NULL)
2683    {
2684       log_error(LOG_LEVEL_ERROR, "Failed to get the encrypted request line");
2685       ssl_send_data_delayed(&(csp->ssl_client_attr),
2686          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2687       return JB_ERR_PARSE;
2688    }
2689    assert(*request_line != '\0');
2690
2691    if (client_protocol_is_unsupported(csp, request_line))
2692    {
2693       /*
2694        * If the protocol is unsupported we're done here.
2695        * client_protocol_is_unsupported() took care of sending
2696        * the error response and logging the error message.
2697        */
2698       return JB_ERR_PARSE;
2699    }
2700
2701 #ifdef FEATURE_FORCE_LOAD
2702    if (force_required(csp, request_line))
2703    {
2704       csp->flags |= CSP_FLAG_FORCED;
2705    }
2706 #endif /* def FEATURE_FORCE_LOAD */
2707
2708    free_http_request(csp->http);
2709
2710    err = parse_http_request(request_line, csp->http);
2711    /* XXX: Restore ssl setting. This is ugly */
2712    csp->http->client_ssl = 1;
2713    csp->http->server_ssl = 1;
2714
2715    freez(request_line);
2716    if (JB_ERR_OK != err)
2717    {
2718       ssl_send_data_delayed(&(csp->ssl_client_attr),
2719          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2720       /* XXX: Use correct size */
2721       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2722       log_error(LOG_LEVEL_ERROR,
2723          "Couldn't parse request line received from %s: %s",
2724          csp->ip_addr_str, jb_err_to_string(err));
2725
2726       free_http_request(csp->http);
2727       return JB_ERR_PARSE;
2728    }
2729
2730    /* Parse the rest of the client's headers. */
2731    init_list(headers);
2732    for (;;)
2733    {
2734       p = get_header(csp->client_iob);
2735
2736       if (p == NULL)
2737       {
2738          /* There are no additional headers to read. */
2739          break;
2740       }
2741       enlist(headers, p);
2742       freez(p);
2743    }
2744
2745    if (JB_ERR_OK != get_destination_from_https_headers(headers, csp->http))
2746    {
2747       /*
2748        * Our attempts to get the request destination
2749        * elsewhere failed.
2750        */
2751       log_error(LOG_LEVEL_ERROR,
2752          "Failed to get the encrypted request destination");
2753       ssl_send_data_delayed(&(csp->ssl_client_attr),
2754          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2755       return JB_ERR_PARSE;
2756    }
2757
2758    /* Split the domain we just got for pattern matching */
2759    init_domain_components(csp->http);
2760
2761 #ifdef FEATURE_CLIENT_TAGS
2762    /* XXX: If the headers were enlisted sooner, passing csp would do. */
2763    if (csp->client_address == NULL)
2764    {
2765       set_client_address(csp, headers);
2766       get_tag_list_for_client(csp->client_tags, csp->client_address);
2767    }
2768 #endif
2769
2770 #ifdef FEATURE_TOGGLE
2771    if ((csp->flags & CSP_FLAG_TOGGLED_ON) != 0)
2772 #endif
2773    {
2774       /*
2775        * Determine the actions for this request after
2776        * clearing the ones from the previous one.
2777        */
2778       free_current_action(csp->action);
2779       get_url_actions(csp, csp->http);
2780    }
2781
2782    enlist(csp->https_headers, csp->http->cmd);
2783
2784    /* Append the previously read headers */
2785    err = list_append_list_unique(csp->https_headers, headers);
2786    destroy_list(headers);
2787    if (JB_ERR_OK != err)
2788    {
2789       /* XXX: Send error message */
2790       return err;
2791    }
2792
2793    /* XXX: Work around crash */
2794    csp->error_message = NULL;
2795
2796    /* XXX: Why do this here? */
2797    csp->http->ssl = 1;
2798
2799    err = sed_https(csp);
2800    if (JB_ERR_OK != err)
2801    {
2802       ssl_send_data_delayed(&(csp->ssl_client_attr),
2803          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2804       log_error(LOG_LEVEL_ERROR, "Failed to parse client request from %s.",
2805          csp->ip_addr_str);
2806       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
2807          csp->ip_addr_str, csp->http->cmd);
2808       return JB_ERR_PARSE;
2809    }
2810
2811    if ((NULL == csp->https_headers->first->str)
2812       || (strcmp(csp->http->cmd, csp->https_headers->first->str) &&
2813          (JB_ERR_OK != change_encrypted_request_destination(csp))))
2814    {
2815       log_error(LOG_LEVEL_ERROR,
2816          "Failed to get the request destination in the rewritten headers");
2817       ssl_send_data_delayed(&(csp->ssl_client_attr),
2818          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2819       return JB_ERR_PARSE;
2820    }
2821
2822    log_error(LOG_LEVEL_HEADER, "Encrypted request processed");
2823    log_applied_actions(csp->action);
2824    log_error(LOG_LEVEL_REQUEST, "https://%s%s", csp->http->hostport,
2825       csp->http->path);
2826
2827    return err;
2828
2829 }
2830
2831 /*********************************************************************
2832  *
2833  * Function    :  cgi_page_requested
2834  *
2835  * Description :  Checks if a request is for an internal CGI page.
2836  *
2837  * Parameters  :
2838  *          1  :  host = The host requested by the client.
2839  *
2840  * Returns     :  1 if a CGI page has been requested, 0 otherwise
2841  *
2842  *********************************************************************/
2843 static int cgi_page_requested(const char *host)
2844 {
2845    if ((0 == strcmpic(host, CGI_SITE_1_HOST))
2846     || (0 == strcmpic(host, CGI_SITE_1_HOST "."))
2847     || (0 == strcmpic(host, CGI_SITE_2_HOST))
2848     || (0 == strcmpic(host, CGI_SITE_2_HOST ".")))
2849    {
2850       return 1;
2851    }
2852
2853    return 0;
2854
2855 }
2856
2857
2858 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2859 /*********************************************************************
2860  *
2861  * Function    :  continue_https_chat
2862  *
2863  * Description :  Behaves similar to chat() but only deals with
2864  *                https-inspected requests that arrive on an already
2865  *                established connection. The first request is always
2866  *                served by chat() which is a lot more complex as it
2867  *                has to deal with forwarding settings and connection
2868  *                failures etc.
2869  *
2870  *                If a connection to the server has already been
2871  *                opened it is reused unless the request is blocked
2872  *                or the forwarder changed.
2873  *
2874  *                If a connection to the server has not yet been
2875  *                opened (because the previous request was crunched),
2876  *                or the forwarder changed, the connection is dropped
2877  *                so that the client retries on a fresh one.
2878  *
2879  * Parameters  :
2880  *          1  :  csp = Current client state (buffers, headers, etc...)
2881  *
2882  * Returns     :  Nothing.
2883  *
2884  *********************************************************************/
2885 static void continue_https_chat(struct client_state *csp)
2886 {
2887    const struct forward_spec *fwd;
2888
2889    if (JB_ERR_OK != process_encrypted_request(csp))
2890    {
2891       return;
2892    }
2893
2894    csp->requests_received_total++;
2895
2896    /*
2897     * We have an encrypted request. Check if one of the crunchers wants it.
2898     */
2899    if (crunch_response_triggered(csp, crunchers_all))
2900    {
2901       /*
2902        * Yes. The client got the crunch response and we're done here.
2903        */
2904       return;
2905    }
2906    if (csp->ssl_with_server_is_opened == 0)
2907    {
2908       log_error(LOG_LEVEL_CONNECT,
2909          "Dropping the client connection on socket %d. "
2910          "The server connection has not been established yet.",
2911          csp->cfd);
2912       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2913       return;
2914    }
2915    assert(csp->server_connection.sfd != JB_INVALID_SOCKET);
2916
2917    fwd = forward_url(csp, csp->http);
2918    if (!connection_destination_matches(&csp->server_connection, csp->http, fwd))
2919    {
2920       log_error(LOG_LEVEL_CONNECT,
2921          "Dropping the client connection on socket %d with "
2922          "server socket %d connected to %s. The forwarder has changed.",
2923          csp->cfd, csp->server_connection.sfd, csp->server_connection.host);
2924       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2925       return;
2926    }
2927
2928    log_error(LOG_LEVEL_CONNECT,
2929       "Reusing server socket %d connected to %s. Requests already sent: %u.",
2930       csp->server_connection.sfd, csp->server_connection.host,
2931       csp->server_connection.requests_sent_total);
2932
2933    if (send_https_request(csp))
2934    {
2935       /*
2936        * Most likely the server connection timed out. We can't easily
2937        * create a new one so simply drop the client connection without a
2938        * error response to let the client retry.
2939        */
2940       log_error(LOG_LEVEL_CONNECT,
2941          "Dropping client connection on socket %d. "
2942          "Forwarding the encrypted client request failed.",
2943          csp->cfd);
2944       return;
2945    }
2946    csp->server_connection.requests_sent_total++;
2947    handle_established_connection(csp);
2948    freez(csp->receive_buffer);
2949 }
2950 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
2951 #endif
2952
2953
2954 /*********************************************************************
2955  *
2956  * Function    :  handle_established_connection
2957  *
2958  * Description :  Shuffle data between client and server once the
2959  *                connection has been established.
2960  *
2961  * Parameters  :
2962  *          1  :  csp = Current client state (buffers, headers, etc...)
2963  *
2964  * Returns     :  Nothing.
2965  *
2966  *********************************************************************/
2967 static void handle_established_connection(struct client_state *csp)
2968 {
2969    char *hdr;
2970    char *p;
2971    int n;
2972 #ifdef HAVE_POLL
2973    struct pollfd poll_fds[2];
2974 #else
2975    fd_set rfds;
2976    jb_socket maxfd;
2977    struct timeval timeout;
2978 #endif
2979    int server_body;
2980    int ms_iis5_hack = 0;
2981    unsigned long long byte_count = 0;
2982    struct http_request *http;
2983    long len = 0; /* for buffer sizes (and negative error codes) */
2984    int buffer_and_filter_content = 0;
2985    unsigned int write_delay;
2986 #ifdef FEATURE_HTTPS_INSPECTION
2987    int ret = 0;
2988    int use_ssl_tunnel = 0;
2989    csp->dont_verify_certificate = 0;
2990
2991    if (csp->http->ssl && !(csp->action->flags & ACTION_HTTPS_INSPECTION))
2992    {
2993       /* Pass encrypted content without filtering. */
2994       use_ssl_tunnel = 1;
2995    }
2996 #endif
2997
2998    /* Skeleton for HTTP response, if we should intercept the request */
2999    struct http_response *rsp;
3000 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3001    int watch_client_socket;
3002 #endif
3003
3004    csp->receive_buffer_size = csp->config->receive_buffer_size;
3005    csp->receive_buffer = zalloc(csp->receive_buffer_size + 1);
3006    if (csp->receive_buffer == NULL)
3007    {
3008       log_error(LOG_LEVEL_ERROR,
3009          "Out of memory. Failed to allocate the receive buffer.");
3010       rsp = cgi_error_memory();
3011       send_crunch_response(csp, rsp);
3012       return;
3013    }
3014
3015    http = csp->http;
3016
3017 #ifndef HAVE_POLL
3018    maxfd = (csp->cfd > csp->server_connection.sfd) ?
3019       csp->cfd : csp->server_connection.sfd;
3020 #endif
3021
3022    /* pass data between the client and server
3023     * until one or the other shuts down the connection.
3024     */
3025
3026    server_body = 0;
3027
3028 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3029    watch_client_socket = 0 == (csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING);
3030 #endif
3031    write_delay = get_write_delay(csp);
3032
3033    for (;;)
3034    {
3035 #ifndef HAVE_POLL
3036       FD_ZERO(&rfds);
3037 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3038       if (!watch_client_socket)
3039       {
3040          maxfd = csp->server_connection.sfd;
3041       }
3042       else
3043 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3044       {
3045          FD_SET(csp->cfd, &rfds);
3046       }
3047
3048       FD_SET(csp->server_connection.sfd, &rfds);
3049 #endif /* ndef HAVE_POLL */
3050
3051 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3052       if ((csp->flags & CSP_FLAG_CHUNKED)
3053          && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3054          && ((csp->iob->eod - csp->iob->cur) >= 5)
3055          && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
3056       {
3057          /*
3058           * XXX: This check should be obsolete now,
3059           *      but let's wait a while to be sure.
3060           */
3061          log_error(LOG_LEVEL_CONNECT,
3062             "Looks like we got the last chunk together with "
3063             "the server headers but didn't detect it earlier. "
3064             "We better stop reading.");
3065          byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3066          csp->expected_content_length = byte_count;
3067          csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3068       }
3069       if (server_body && server_response_is_complete(csp, byte_count))
3070       {
3071          if (csp->expected_content_length == byte_count)
3072          {
3073             log_error(LOG_LEVEL_CONNECT,
3074                "Done reading from server. Content length: %llu as expected. "
3075                "Bytes most recently read: %ld.",
3076                byte_count, len);
3077          }
3078          else
3079          {
3080             log_error(LOG_LEVEL_CONNECT,
3081                "Done reading from server. Expected content length: %llu. "
3082                "Actual content length: %llu. Bytes most recently read: %ld.",
3083                csp->expected_content_length, byte_count, len);
3084          }
3085          len = 0;
3086          /*
3087           * XXX: Should not jump around, handle_established_connection()
3088           * is complicated enough already.
3089           */
3090          goto reading_done;
3091       }
3092 #endif  /* FEATURE_CONNECTION_KEEP_ALIVE */
3093
3094 #ifdef HAVE_POLL
3095       poll_fds[0].fd = csp->cfd;
3096 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3097       if (!watch_client_socket)
3098       {
3099          /*
3100           * Ignore incoming data, but still watch out
3101           * for disconnects etc. These flags are always
3102           * implied anyway but explicitly setting them
3103           * doesn't hurt.
3104           */
3105          poll_fds[0].events = POLLERR|POLLHUP;
3106       }
3107       else
3108 #endif
3109       {
3110          poll_fds[0].events = POLLIN;
3111       }
3112       poll_fds[1].fd = csp->server_connection.sfd;
3113       poll_fds[1].events = POLLIN;
3114       n = poll(poll_fds, 2, csp->config->socket_timeout * 1000);
3115 #else
3116       timeout.tv_sec = csp->config->socket_timeout;
3117       timeout.tv_usec = 0;
3118       n = select((int)maxfd + 1, &rfds, NULL, NULL, &timeout);
3119 #endif /* def HAVE_POLL */
3120
3121       /*server or client not responding in timeout */
3122       if (n == 0)
3123       {
3124          log_error(LOG_LEVEL_CONNECT, "Socket timeout %d reached: %s",
3125             csp->config->socket_timeout, http->url);
3126          if ((byte_count == 0) && (http->ssl == 0))
3127          {
3128             send_crunch_response(csp, error_response(csp, "connection-timeout"));
3129          }
3130          mark_server_socket_tainted(csp);
3131 #ifdef FEATURE_HTTPS_INSPECTION
3132          close_client_and_server_ssl_connections(csp);
3133 #endif
3134          return;
3135       }
3136       else if (n < 0)
3137       {
3138 #ifdef HAVE_POLL
3139          log_error(LOG_LEVEL_ERROR, "poll() failed!: %E");
3140 #else
3141          log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
3142 #endif
3143          mark_server_socket_tainted(csp);
3144 #ifdef FEATURE_HTTPS_INSPECTION
3145          close_client_and_server_ssl_connections(csp);
3146 #endif
3147          return;
3148       }
3149
3150       /*
3151        * This is the body of the browser's request,
3152        * just read and write it.
3153        *
3154        * Receives data from browser and sends it to server
3155        *
3156        * XXX: Make sure the client doesn't use pipelining
3157        * behind Privoxy's back.
3158        */
3159 #ifdef HAVE_POLL
3160       if ((poll_fds[0].revents & (POLLERR|POLLHUP|POLLNVAL)) != 0)
3161       {
3162          log_error(LOG_LEVEL_CONNECT,
3163             "The client socket %d has become unusable while "
3164             "the server socket %d is still open.",
3165             csp->cfd, csp->server_connection.sfd);
3166          mark_server_socket_tainted(csp);
3167          break;
3168       }
3169
3170       if (poll_fds[0].revents != 0)
3171 #else
3172       if (FD_ISSET(csp->cfd, &rfds))
3173 #endif /* def HAVE_POLL*/
3174       {
3175          int max_bytes_to_read = (int)csp->receive_buffer_size;
3176
3177 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3178          if ((csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ))
3179          {
3180             if (data_is_available(csp->cfd, 0))
3181             {
3182                /*
3183                 * If the next request is already waiting, we have
3184                 * to stop select()ing the client socket. Otherwise
3185                 * we would always return right away and get nothing
3186                 * else done.
3187                 */
3188                watch_client_socket = 0;
3189                log_error(LOG_LEVEL_CONNECT,
3190                   "Stop watching client socket %d. "
3191                   "There's already another request waiting.",
3192                   csp->cfd);
3193                continue;
3194             }
3195             /*
3196              * If the client socket is set, but there's no data
3197              * available on the socket, the client went fishing
3198              * and continuing talking to the server makes no sense.
3199              */
3200             log_error(LOG_LEVEL_CONNECT,
3201                "The client closed socket %d while "
3202                "the server socket %d is still open.",
3203                csp->cfd, csp->server_connection.sfd);
3204             mark_server_socket_tainted(csp);
3205             break;
3206          }
3207          if (csp->expected_client_content_length != 0)
3208          {
3209             if (csp->expected_client_content_length < csp->receive_buffer_size)
3210             {
3211                max_bytes_to_read = (int)csp->expected_client_content_length;
3212             }
3213             log_error(LOG_LEVEL_CONNECT,
3214                "Waiting for up to %d bytes from the client.",
3215                max_bytes_to_read);
3216          }
3217          assert(max_bytes_to_read <= csp->receive_buffer_size);
3218 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3219
3220 #ifdef FEATURE_HTTPS_INSPECTION
3221          if (client_use_ssl(csp))
3222          {
3223             if (csp->http->status == 101)
3224             {
3225                len = ssl_recv_data(&(csp->ssl_client_attr),
3226                   (unsigned char *)csp->receive_buffer,
3227                   (size_t)max_bytes_to_read);
3228                if (len == -1)
3229                {
3230                   log_error(LOG_LEVEL_ERROR, "Failed to receive data "
3231                      "on client socket %d for an upgraded connection",
3232                      csp->cfd);
3233                   break;
3234                }
3235                if (len == 0)
3236                {
3237                   log_error(LOG_LEVEL_CONNECT, "Done receiving data "
3238                      "on client socket %d for an upgraded connection",
3239                      csp->cfd);
3240                   break;
3241                }
3242                byte_count += (unsigned long long)len;
3243                len = ssl_send_data(&(csp->ssl_server_attr),
3244                   (unsigned char *)csp->receive_buffer, (size_t)len);
3245                if (len == -1)
3246                {
3247                   log_error(LOG_LEVEL_ERROR, "Failed to send data "
3248                      "on server socket %d for an upgraded connection",
3249                      csp->server_connection.sfd);
3250                   break;
3251                }
3252                continue;
3253             }
3254             log_error(LOG_LEVEL_CONNECT, "Breaking with TLS/SSL.");
3255             break;
3256          }
3257          else
3258 #endif /* def FEATURE_HTTPS_INSPECTION */
3259          {
3260             len = read_socket(csp->cfd, csp->receive_buffer, max_bytes_to_read);
3261
3262             if (len <= 0)
3263             {
3264                /* XXX: not sure if this is necessary. */
3265                mark_server_socket_tainted(csp);
3266                break; /* "game over, man" */
3267             }
3268
3269 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3270             if (csp->expected_client_content_length != 0)
3271             {
3272                assert(len <= max_bytes_to_read);
3273                csp->expected_client_content_length -= (unsigned)len;
3274                log_error(LOG_LEVEL_CONNECT,
3275                   "Expected client content length set to %llu "
3276                   "after reading %ld bytes.",
3277                   csp->expected_client_content_length, len);
3278                if (csp->expected_client_content_length == 0)
3279                {
3280                   log_error(LOG_LEVEL_CONNECT,
3281                      "Done reading from the client.");
3282                   csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
3283                }
3284             }
3285 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3286
3287             if (write_socket(csp->server_connection.sfd, csp->receive_buffer, (size_t)len))
3288             {
3289                log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
3290                mark_server_socket_tainted(csp);
3291                return;
3292             }
3293          }
3294          continue;
3295       }
3296
3297       /*
3298        * The server wants to talk. It could be the header or the body.
3299        * If `hdr' is null, then it's the header otherwise it's the body.
3300        * FIXME: Does `hdr' really mean `host'? No.
3301        */
3302 #ifdef HAVE_POLL
3303       if (poll_fds[1].revents != 0)
3304 #else
3305       if (FD_ISSET(csp->server_connection.sfd, &rfds))
3306 #endif /* HAVE_POLL */
3307       {
3308 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3309          /*
3310           * If we are buffering content, we don't want to eat up to
3311           * buffer-limit bytes if the client no longer cares about them.
3312           * If we aren't buffering, however, a dead client socket will be
3313           * noticed pretty much right away anyway, so we can reduce the
3314           * overhead by skipping the check.
3315           */
3316          if (buffer_and_filter_content && !socket_is_still_alive(csp->cfd))
3317          {
3318 #ifdef _WIN32
3319             log_error(LOG_LEVEL_CONNECT,
3320                "The server still wants to talk, but the client may already have hung up on us.");
3321 #else
3322             log_error(LOG_LEVEL_CONNECT,
3323                "The server still wants to talk, but the client hung up on us.");
3324             mark_server_socket_tainted(csp);
3325 #ifdef FEATURE_HTTPS_INSPECTION
3326             close_client_and_server_ssl_connections(csp);
3327 #endif
3328             return;
3329 #endif /* def _WIN32 */
3330          }
3331 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3332
3333 #ifdef FEATURE_HTTPS_INSPECTION
3334          /*
3335           * Reading data from standard or secured connection (HTTP/HTTPS)
3336           */
3337          if (server_use_ssl(csp))
3338          {
3339             len = ssl_recv_data(&(csp->ssl_server_attr),
3340                (unsigned char *)csp->receive_buffer, csp->receive_buffer_size);
3341          }
3342          else
3343 #endif
3344          {
3345             len = read_socket(csp->server_connection.sfd, csp->receive_buffer,
3346                (int)csp->receive_buffer_size);
3347          }
3348
3349          if (len < 0)
3350          {
3351             log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
3352
3353             if ((http->ssl && (csp->fwd == NULL))
3354 #ifdef FEATURE_HTTPS_INSPECTION
3355                && use_ssl_tunnel
3356 #endif
3357                 )
3358             {
3359                /*
3360                 * Just hang up. We already confirmed the client's CONNECT
3361                 * request with status code 200 and unencrypted content is
3362                 * no longer welcome.
3363                 */
3364                log_error(LOG_LEVEL_ERROR,
3365                   "CONNECT already confirmed. Unable to tell the client about the problem.");
3366                return;
3367             }
3368             else if (byte_count)
3369             {
3370                /*
3371                 * Just hang up. We already transmitted the original headers
3372                 * and parts of the original content and therefore missed the
3373                 * chance to send an error message (without risking data corruption).
3374                 *
3375                 * XXX: we could retry with a fancy range request here.
3376                 */
3377                log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
3378                   "Unable to tell the client about the problem.");
3379                mark_server_socket_tainted(csp);
3380 #ifdef FEATURE_HTTPS_INSPECTION
3381                close_client_and_server_ssl_connections(csp);
3382 #endif
3383                return;
3384             }
3385             /*
3386              * XXX: Consider handling the cases above the same.
3387              */
3388             mark_server_socket_tainted(csp);
3389             len = 0;
3390          }
3391
3392 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3393          if (csp->flags & CSP_FLAG_CHUNKED)
3394          {
3395             if ((len >= 5) && !memcmp(csp->receive_buffer+len-5, "0\r\n\r\n", 5))
3396             {
3397                /* XXX: this is a temporary hack */
3398                log_error(LOG_LEVEL_CONNECT,
3399                   "Looks like we reached the end of the last chunk. "
3400                   "We better stop reading.");
3401                csp->expected_content_length = byte_count + (unsigned long long)len;
3402                csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3403             }
3404          }
3405          reading_done:
3406 #endif  /* FEATURE_CONNECTION_KEEP_ALIVE */
3407
3408          /*
3409           * This is guaranteed by allocating with zalloc_or_die()
3410           * and never (intentionally) writing to the last byte.
3411           *
3412           * csp->receive_buffer_size is the size of the part of the
3413           * buffer we intentionally write to, but we actually
3414           * allocated csp->receive_buffer_size+1 bytes so the assertion
3415           * stays within the allocated range.
3416           */
3417          assert(csp->receive_buffer[csp->receive_buffer_size] == '\0');
3418
3419          /*
3420           * Add a trailing zero to let be able to use string operations.
3421           * XXX: do we still need this with filter_popups gone?
3422           */
3423          assert(len <= csp->receive_buffer_size);
3424          csp->receive_buffer[len] = '\0';
3425
3426          /*
3427           * Normally, this would indicate that we've read
3428           * as much as the server has sent us and we can
3429           * close the client connection.  However, Microsoft
3430           * in its wisdom has released IIS/5 with a bug that
3431           * prevents it from sending the trailing \r\n in
3432           * a 302 redirect header (and possibly other headers).
3433           * To work around this if we've haven't parsed
3434           * a full header we'll append a trailing \r\n
3435           * and see if this now generates a valid one.
3436           *
3437           * This hack shouldn't have any impacts.  If we've
3438           * already transmitted the header or if this is a
3439           * SSL connection, then we won't bother with this
3440           * hack.  So we only work on partially received
3441           * headers.  If we append a \r\n and this still
3442           * doesn't generate a valid header, then we won't
3443           * transmit anything to the client.
3444           */
3445          if (len == 0)
3446          {
3447
3448             if (server_body || (http->ssl
3449 #ifdef FEATURE_HTTPS_INSPECTION
3450                   && use_ssl_tunnel
3451 #endif
3452                ))
3453             {
3454                /*
3455                 * If we have been buffering up the document,
3456                 * now is the time to apply content modification
3457                 * and send the result to the client.
3458                 */
3459                if (buffer_and_filter_content)
3460                {
3461                   p = execute_content_filters(csp);
3462                   /*
3463                    * If content filtering fails, use the original
3464                    * buffer and length.
3465                    * (see p != NULL ? p : csp->iob->cur below)
3466                    */
3467                   if (NULL == p)
3468                   {
3469                      csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
3470                   }
3471 #ifdef FEATURE_COMPRESSION
3472                   else if ((csp->flags & CSP_FLAG_CLIENT_SUPPORTS_DEFLATE)
3473                      && (csp->content_length > LOWER_LENGTH_LIMIT_FOR_COMPRESSION))
3474                   {
3475                      char *compressed_content = compress_buffer(p,
3476                         (size_t *)&csp->content_length, csp->config->compression_level);
3477                      if (compressed_content != NULL)
3478                      {
3479                         freez(p);
3480                         p = compressed_content;
3481                         csp->flags |= CSP_FLAG_BUFFERED_CONTENT_DEFLATED;
3482                      }
3483                   }
3484 #endif
3485
3486                   if (JB_ERR_OK != update_server_headers(csp))
3487                   {
3488                      log_error(LOG_LEVEL_FATAL,
3489                         "Failed to update server headers. after filtering.");
3490                   }
3491
3492                   hdr = list_to_text(csp->headers);
3493                   if (hdr == NULL)
3494                   {
3495                      /* FIXME Should handle error properly */
3496                      log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3497                   }
3498
3499 #ifdef FEATURE_HTTPS_INSPECTION
3500                   /*
3501                    * Sending data with standard or secured connection (HTTP/HTTPS)
3502                    */
3503                   if (client_use_ssl(csp))
3504                   {
3505                      if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
3506                               (const unsigned char *)hdr, strlen(hdr),
3507                               get_write_delay(csp)) < 0)
3508                         || (ssl_send_data_delayed(&(csp->ssl_client_attr),
3509                               (const unsigned char *) ((p != NULL) ? p : csp->iob->cur),
3510                               csp->content_length, get_write_delay(csp)) < 0))
3511                      {
3512                         log_error(LOG_LEVEL_ERROR, "write modified content to "
3513                            "client over TLS/SSL failed");
3514                         freez(hdr);
3515                         freez(p);
3516                         mark_server_socket_tainted(csp);
3517                         close_client_and_server_ssl_connections(csp);
3518                         return;
3519                      }
3520                   }
3521                   else
3522 #endif /* def FEATURE_HTTPS_INSPECTION */
3523                   {
3524                      if (write_socket_delayed(csp->cfd, hdr, strlen(hdr), write_delay)
3525                       || write_socket_delayed(csp->cfd, ((p != NULL) ? p : csp->iob->cur),
3526                          (size_t)csp->content_length, write_delay))
3527                      {
3528                         log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
3529                         freez(hdr);
3530                         freez(p);
3531                         mark_server_socket_tainted(csp);
3532                         return;
3533                      }
3534                   }
3535
3536                   freez(hdr);
3537                   freez(p);
3538                }
3539
3540                break; /* "game over, man" */
3541             }
3542
3543             /*
3544              * This is NOT the body, so
3545              * Let's pretend the server just sent us a blank line.
3546              */
3547             snprintf(csp->receive_buffer, csp->receive_buffer_size, "\r\n");
3548             len = (int)strlen(csp->receive_buffer);
3549
3550             /*
3551              * Now, let the normal header parsing algorithm below do its
3552              * job.  If it fails, we'll exit instead of continuing.
3553              */
3554
3555             ms_iis5_hack = 1;
3556          }
3557
3558          /*
3559           * If we're in the body of the server document, just write it to
3560           * the client, unless we need to buffer the body for later
3561           * content-filtering.
3562           */
3563          if (server_body || (http->ssl
3564 #ifdef FEATURE_HTTPS_INSPECTION
3565                && use_ssl_tunnel
3566 #endif
3567             ))
3568          {
3569             if (buffer_and_filter_content)
3570             {
3571                /*
3572                 * If there is no memory left for buffering the content, or the buffer limit
3573                 * has been reached, switch to non-filtering mode, i.e. make & write the
3574                 * header, flush the iob and buf, and get out of the way.
3575                 */
3576                if (add_to_iob(csp->iob, csp->config->buffer_limit, csp->receive_buffer, len))
3577                {
3578                   size_t hdrlen;
3579                   long flushed;
3580
3581                   log_error(LOG_LEVEL_INFO,
3582                      "Flushing header and buffers. Stepping back from filtering.");
3583
3584                   hdr = list_to_text(csp->headers);
3585                   if (hdr == NULL)
3586                   {
3587                      /*
3588                       * Memory is too tight to even generate the header.
3589                       * Send our static "Out-of-memory" page.
3590                       */
3591                      log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
3592                      rsp = cgi_error_memory();
3593                      send_crunch_response(csp, rsp);
3594                      mark_server_socket_tainted(csp);
3595 #ifdef FEATURE_HTTPS_INSPECTION
3596                      close_client_and_server_ssl_connections(csp);
3597 #endif
3598                      return;
3599                   }
3600                   hdrlen = strlen(hdr);
3601
3602 #ifdef FEATURE_HTTPS_INSPECTION
3603                   /*
3604                    * Sending data with standard or secured connection (HTTP/HTTPS)
3605                    */
3606                   if (client_use_ssl(csp))
3607                   {
3608                      if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
3609                              (const unsigned char *)hdr, hdrlen, get_write_delay(csp)) < 0)
3610                         || ((flushed = ssl_flush_socket(&(csp->ssl_client_attr),
3611                                 csp->iob)) < 0)
3612                         || (ssl_send_data_delayed(&(csp->ssl_client_attr),
3613                               (const unsigned char *)csp->receive_buffer, (size_t)len,
3614                               get_write_delay(csp)) < 0))
3615                      {
3616                         log_error(LOG_LEVEL_CONNECT,
3617                            "Flush header and buffers to client failed");
3618                         freez(hdr);
3619                         mark_server_socket_tainted(csp);
3620                         close_client_and_server_ssl_connections(csp);
3621                         return;
3622                      }
3623                   }
3624                   else
3625 #endif /* def FEATURE_HTTPS_INSPECTION */
3626                   {
3627                      if (write_socket_delayed(csp->cfd, hdr, hdrlen, write_delay)
3628                       || ((flushed = flush_iob(csp->cfd, csp->iob, write_delay)) < 0)
3629                       || write_socket_delayed(csp->cfd, csp->receive_buffer, (size_t)len,
3630                             write_delay))
3631                      {
3632                         log_error(LOG_LEVEL_CONNECT,
3633                            "Flush header and buffers to client failed: %E");
3634                         freez(hdr);
3635                         mark_server_socket_tainted(csp);
3636                         return;
3637                      }
3638                   }
3639
3640                   /*
3641                    * Reset the byte_count to the amount of bytes
3642                    * we just flushed. len will be added a few lines below,
3643                    * hdrlen doesn't matter for LOG_LEVEL_CLF.
3644                    */
3645                   byte_count = (unsigned long long)flushed;
3646                   freez(hdr);
3647                   buffer_and_filter_content = 0;
3648                   server_body = 1;
3649                }
3650             }
3651             else
3652             {
3653 #ifdef FEATURE_HTTPS_INSPECTION
3654                /*
3655                 * Sending data with standard or secured connection (HTTP/HTTPS)
3656                 */
3657                if (client_use_ssl(csp))
3658                {
3659                   ret = ssl_send_data_delayed(&(csp->ssl_client_attr),
3660                      (const unsigned char *)csp->receive_buffer, (size_t)len,
3661                      get_write_delay(csp));
3662                   if (ret < 0)
3663                   {
3664                      log_error(LOG_LEVEL_ERROR,
3665                         "Sending data to client failed");
3666                      mark_server_socket_tainted(csp);
3667                      close_client_and_server_ssl_connections(csp);
3668                      return;
3669                   }
3670                }
3671                else
3672 #endif /* def FEATURE_HTTPS_INSPECTION */
3673                {
3674                   if (write_socket_delayed(csp->cfd, csp->receive_buffer,
3675                         (size_t)len, write_delay))
3676                   {
3677                      log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
3678                      mark_server_socket_tainted(csp);
3679                      return;
3680                   }
3681                }
3682             }
3683             byte_count += (unsigned long long)len;
3684             continue;
3685          }
3686          else
3687          {
3688             /*
3689              * We're still looking for the end of the server's header.
3690              * Buffer up the data we just read.  If that fails, there's
3691              * little we can do but send our static out-of-memory page.
3692              */
3693             if (add_to_iob(csp->iob, csp->config->buffer_limit, csp->receive_buffer, len))
3694             {
3695                log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
3696                rsp = cgi_error_memory();
3697                send_crunch_response(csp, rsp);
3698                mark_server_socket_tainted(csp);
3699 #ifdef FEATURE_HTTPS_INSPECTION
3700                close_client_and_server_ssl_connections(csp);
3701 #endif
3702                return;
3703             }
3704
3705             /* Convert iob into something sed() can digest */
3706             if (JB_ERR_PARSE == get_server_headers(csp))
3707             {
3708                if (ms_iis5_hack)
3709                {
3710                   /*
3711                    * Well, we tried our MS IIS/5 hack and it didn't work.
3712                    * The header is incomplete and there isn't anything
3713                    * we can do about it.
3714                    */
3715                   log_error(LOG_LEVEL_ERROR, "Invalid server headers. "
3716                      "Applying the MS IIS5 hack didn't help.");
3717                   log_error(LOG_LEVEL_CLF,
3718                      "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3719 #ifdef FEATURE_HTTPS_INSPECTION
3720                   /*
3721                    * Sending data with standard or secured connection (HTTP/HTTPS)
3722                    */
3723                   if (client_use_ssl(csp))
3724                   {
3725                      ssl_send_data_delayed(&(csp->ssl_client_attr),
3726                         (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3727                         strlen(INVALID_SERVER_HEADERS_RESPONSE), get_write_delay(csp));
3728                   }
3729                   else
3730 #endif /* def FEATURE_HTTPS_INSPECTION */
3731                   {
3732                      write_socket_delayed(csp->cfd,
3733                         INVALID_SERVER_HEADERS_RESPONSE,
3734                         strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3735                   }
3736                   mark_server_socket_tainted(csp);
3737 #ifdef FEATURE_HTTPS_INSPECTION
3738                   close_client_and_server_ssl_connections(csp);
3739 #endif
3740                   return;
3741                }
3742                else
3743                {
3744                   /*
3745                    * Since we have to wait for more from the server before
3746                    * we can parse the headers we just continue here.
3747                    */
3748                   log_error(LOG_LEVEL_CONNECT,
3749                      "Continuing buffering server headers from socket %d. "
3750                      "Bytes most recently read: %ld.", csp->cfd, len);
3751                   continue;
3752                }
3753             }
3754             else
3755             {
3756                /*
3757                 * Account for the content bytes we
3758                 * might have gotten with the headers.
3759                 */
3760                assert(csp->iob->eod >= csp->iob->cur);
3761                byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3762             }
3763
3764             /* Did we actually get anything? */
3765             if (NULL == csp->headers->first)
3766             {
3767                if ((csp->flags & CSP_FLAG_REUSED_CLIENT_CONNECTION))
3768                {
3769                   log_error(LOG_LEVEL_ERROR,
3770                      "No server or forwarder response received on socket %d. "
3771                      "Closing client socket %d without sending data.",
3772                      csp->server_connection.sfd, csp->cfd);
3773                   log_error(LOG_LEVEL_CLF,
3774                      "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3775                }
3776                else
3777                {
3778                   log_error(LOG_LEVEL_ERROR,
3779                      "No server or forwarder response received on socket %d.",
3780                      csp->server_connection.sfd);
3781                   send_crunch_response(csp, error_response(csp, "no-server-data"));
3782                }
3783                free_http_request(http);
3784                mark_server_socket_tainted(csp);
3785 #ifdef FEATURE_HTTPS_INSPECTION
3786                close_client_and_server_ssl_connections(csp);
3787 #endif
3788                return;
3789             }
3790
3791             if (!csp->headers->first->str)
3792             {
3793                log_error(LOG_LEVEL_ERROR, "header search: csp->headers->first->str == NULL, assert will be called");
3794             }
3795             assert(csp->headers->first->str);
3796
3797             if (strncmpic(csp->headers->first->str, "HTTP", 4) &&
3798                 strncmpic(csp->headers->first->str, "ICY", 3))
3799             {
3800                /*
3801                 * It doesn't look like a HTTP (or Shoutcast) response:
3802                 * tell the client and log the problem.
3803                 */
3804                if (strlen(csp->headers->first->str) > 30)
3805                {
3806                   csp->headers->first->str[30] = '\0';
3807                }
3808                log_error(LOG_LEVEL_ERROR,
3809                   "Invalid server or forwarder response. Starts with: %s",
3810                   csp->headers->first->str);
3811                log_error(LOG_LEVEL_CLF,
3812      &