Rename the mutex used to protect the block reason statistics
[privoxy.git] / 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_reason_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.\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.\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.\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.\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.\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.\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.\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.\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.\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.\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,
380             "sig_handler: exiting on unexpected signal %d", the_signal);
381    }
382    return;
383
384 }
385 #endif
386
387
388 /*********************************************************************
389  *
390  * Function    :  get_write_delay
391  *
392  * Description :  Parse the delay-response parameter.
393  *
394  * Parameters  :
395  *          1  :  csp = Current client state (buffers, headers, etc...)
396  *
397  * Returns     :  Number of milliseconds to delay writes.
398  *
399  *********************************************************************/
400 static unsigned int get_write_delay(const struct client_state *csp)
401 {
402    unsigned int delay;
403    char *endptr;
404    char *newval;
405
406    if ((csp->action->flags & ACTION_DELAY_RESPONSE) == 0)
407    {
408       return 0;
409    }
410    newval = csp->action->string[ACTION_STRING_DELAY_RESPONSE];
411
412    delay = (unsigned)strtol(newval, &endptr, 0);
413    if (*endptr != '\0')
414    {
415       log_error(LOG_LEVEL_FATAL,
416          "Invalid delay-response{} parameter: '%s'", newval);
417    }
418
419    return delay;
420
421 }
422
423
424 /*********************************************************************
425  *
426  * Function    :  client_protocol_is_unsupported
427  *
428  * Description :  Checks if the client used a known unsupported
429  *                protocol and deals with it by sending an error
430  *                response.
431  *
432  * Parameters  :
433  *          1  :  csp = Current client state (buffers, headers, etc...)
434  *          2  :  req = the first request line send by the client
435  *
436  * Returns     :  TRUE if an error response has been generated, or
437  *                FALSE if the request doesn't look invalid.
438  *
439  *********************************************************************/
440 static int client_protocol_is_unsupported(struct client_state *csp, char *req)
441 {
442    /*
443     * If it's a FTP or gopher request, we don't support it.
444     *
445     * These checks are better than nothing, but they might
446     * not work in all configurations and some clients might
447     * have problems digesting the answer.
448     *
449     * They should, however, never cause more problems than
450     * Privoxy's old behaviour (returning the misleading HTML
451     * error message:
452     *
453     * "Could not resolve http://(ftp|gopher)://example.org").
454     */
455    if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
456    {
457       const char *response = NULL;
458       const char *protocol = NULL;
459
460       if (!strncmpic(req, "GET ftp://", 10))
461       {
462          response = FTP_RESPONSE;
463          protocol = "FTP";
464       }
465       else
466       {
467          response = GOPHER_RESPONSE;
468          protocol = "GOPHER";
469       }
470       log_error(LOG_LEVEL_ERROR,
471          "%s tried to use Privoxy as %s proxy: %s",
472          csp->ip_addr_str, protocol, req);
473       log_error(LOG_LEVEL_CLF,
474          "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
475       freez(req);
476
477 #ifdef FEATURE_HTTPS_INSPECTION
478       if (client_use_ssl(csp))
479       {
480          ssl_send_data_delayed(&(csp->ssl_client_attr),
481             (const unsigned char *)response, strlen(response),
482             get_write_delay(csp));
483       }
484       else
485 #endif
486       {
487          write_socket_delayed(csp->cfd, response, strlen(response),
488             get_write_delay(csp));
489       }
490
491       return TRUE;
492    }
493
494    return FALSE;
495 }
496
497
498 /*********************************************************************
499  *
500  * Function    :  client_has_unsupported_expectations
501  *
502  * Description :  Checks if the client used an unsupported expectation
503  *                in which case an error message is delivered.
504  *
505  * Parameters  :
506  *          1  :  csp = Current client state (buffers, headers, etc...)
507  *
508  * Returns     :  TRUE if an error response has been generated, or
509  *                FALSE if the request doesn't look invalid.
510  *
511  *********************************************************************/
512 static int client_has_unsupported_expectations(const struct client_state *csp)
513 {
514    if ((csp->flags & CSP_FLAG_UNSUPPORTED_CLIENT_EXPECTATION))
515    {
516       log_error(LOG_LEVEL_ERROR,
517          "Rejecting request from client %s with unsupported Expect header value",
518          csp->ip_addr_str);
519       log_error(LOG_LEVEL_CLF,
520          "%s - - [%T] \"%s\" 417 0", csp->ip_addr_str, csp->http->cmd);
521       write_socket_delayed(csp->cfd,
522          UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE,
523          strlen(UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE),
524          get_write_delay(csp));
525
526       return TRUE;
527    }
528
529    return FALSE;
530
531 }
532
533
534 /*********************************************************************
535  *
536  * Function    :  get_request_destination_elsewhere
537  *
538  * Description :  If the client's request was redirected into
539  *                Privoxy without the client's knowledge,
540  *                the request line lacks the destination host.
541  *
542  *                This function tries to get it elsewhere,
543  *                provided accept-intercepted-requests is enabled.
544  *
545  *                "Elsewhere" currently only means "Host: header",
546  *                but in the future we may ask the redirecting
547  *                packet filter to look the destination up.
548  *
549  *                If the destination stays unknown, an error
550  *                response is send to the client and headers
551  *                are freed so that chat() can return directly.
552  *
553  * Parameters  :
554  *          1  :  csp = Current client state (buffers, headers, etc...)
555  *          2  :  headers = a header list
556  *
557  * Returns     :  JB_ERR_OK if the destination is now known, or
558  *                JB_ERR_PARSE if it isn't.
559  *
560  *********************************************************************/
561 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
562 {
563    if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
564    {
565       log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
566          " Privoxy isn't configured to accept intercepted requests.",
567          csp->ip_addr_str, csp->http->cmd);
568       /* XXX: Use correct size */
569       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
570          csp->ip_addr_str, csp->http->cmd);
571
572       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER),
573          get_write_delay(csp));
574       destroy_list(headers);
575
576       return JB_ERR_PARSE;
577    }
578    else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
579    {
580       /* Split the domain we just got for pattern matching */
581       init_domain_components(csp->http);
582
583       return JB_ERR_OK;
584    }
585    else
586    {
587       /* We can't work without destination. Go spread the news.*/
588
589       /* XXX: Use correct size */
590       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
591          csp->ip_addr_str, csp->http->cmd);
592       log_error(LOG_LEVEL_ERROR,
593          "Privoxy was unable to get the destination for %s's request: %s",
594          csp->ip_addr_str, csp->http->cmd);
595
596       write_socket_delayed(csp->cfd, MISSING_DESTINATION_RESPONSE,
597          strlen(MISSING_DESTINATION_RESPONSE), get_write_delay(csp));
598       destroy_list(headers);
599
600       return JB_ERR_PARSE;
601    }
602    /*
603     * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
604     * to get the destination IP address, use it as host directly
605     * or do a reverse DNS lookup first.
606     */
607 }
608
609
610 /*********************************************************************
611  *
612  * Function    :  get_server_headers
613  *
614  * Description :  Parses server headers in iob and fills them
615  *                into csp->headers so that they can later be
616  *                handled by sed().
617  *
618  * Parameters  :
619  *          1  :  csp = Current client state (buffers, headers, etc...)
620  *
621  * Returns     :  JB_ERR_OK if everything went fine, or
622  *                JB_ERR_PARSE if the headers were incomplete.
623  *
624  *********************************************************************/
625 static jb_err get_server_headers(struct client_state *csp)
626 {
627    int continue_hack_in_da_house = 0;
628    char * header;
629
630    while (((header = get_header(csp->iob)) != NULL) || continue_hack_in_da_house)
631    {
632       if (header == NULL)
633       {
634          /*
635           * continue hack in da house. Ignore the ending of
636           * this head and continue enlisting header lines.
637           * The reason is described below.
638           */
639          enlist(csp->headers, "");
640          continue_hack_in_da_house = 0;
641          continue;
642       }
643       else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
644       {
645          /*
646           * It's a bodyless continue response, don't
647           * stop header parsing after reaching its end.
648           *
649           * As a result Privoxy will concatenate the
650           * next response's head and parse and deliver
651           * the headers as if they belonged to one request.
652           *
653           * The client will separate them because of the
654           * empty line between them.
655           *
656           * XXX: What we're doing here is clearly against
657           * the intended purpose of the continue header,
658           * and under some conditions (HTTP/1.0 client request)
659           * it's a standard violation.
660           *
661           * Anyway, "sort of against the spec" is preferable
662           * to "always getting confused by Continue responses"
663           * (Privoxy's behaviour before this hack was added)
664           */
665          log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
666          continue_hack_in_da_house = 1;
667       }
668       else if (*header == '\0')
669       {
670          /*
671           * If the header is empty, but the Continue hack
672           * isn't active, we can assume that we reached the
673           * end of the buffer before we hit the end of the
674           * head.
675           *
676           * Inform the caller an let it decide how to handle it.
677           */
678          return JB_ERR_PARSE;
679       }
680
681       if (JB_ERR_MEMORY == enlist(csp->headers, header))
682       {
683          /*
684           * XXX: Should we quit the request and return a
685           * out of memory error page instead?
686           */
687          log_error(LOG_LEVEL_ERROR,
688             "Out of memory while enlisting server headers. %s lost.",
689             header);
690       }
691       freez(header);
692    }
693
694    return JB_ERR_OK;
695 }
696
697
698 /*********************************************************************
699  *
700  * Function    :  crunch_reason
701  *
702  * Description :  Translates the crunch reason code into a string.
703  *
704  * Parameters  :
705  *          1  :  rsp = a http_response
706  *
707  * Returns     :  A string with the crunch reason or an error description.
708  *
709  *********************************************************************/
710 static const char *crunch_reason(const struct http_response *rsp)
711 {
712    char * reason = NULL;
713
714    assert(rsp != NULL);
715    if (rsp == NULL)
716    {
717       return "Internal error while searching for crunch reason";
718    }
719
720    switch (rsp->crunch_reason)
721    {
722       case UNSUPPORTED:
723          reason = "Unsupported HTTP feature";
724          break;
725       case BLOCKED:
726          reason = "Blocked";
727          break;
728       case UNTRUSTED:
729          reason = "Untrusted";
730          break;
731       case REDIRECTED:
732          reason = "Redirected";
733          break;
734       case CGI_CALL:
735          reason = "CGI Call";
736          break;
737       case NO_SUCH_DOMAIN:
738          reason = "DNS failure";
739          break;
740       case FORWARDING_FAILED:
741          reason = "Forwarding failed";
742          break;
743       case CONNECT_FAILED:
744          reason = "Connection failure";
745          break;
746       case OUT_OF_MEMORY:
747          reason = "Out of memory (may mask other reasons)";
748          break;
749       case CONNECTION_TIMEOUT:
750          reason = "Connection timeout";
751          break;
752       case NO_SERVER_DATA:
753          reason = "No server data received";
754          break;
755       default:
756          reason = "No reason recorded";
757          break;
758    }
759
760    return reason;
761 }
762
763
764 /*********************************************************************
765  *
766  * Function    :  log_applied_actions
767  *
768  * Description :  Logs the applied actions if LOG_LEVEL_ACTIONS is
769  *                enabled.
770  *
771  * Parameters  :
772  *          1  :  actions = Current action spec to log
773  *
774  * Returns     :  Nothing.
775  *
776  *********************************************************************/
777 static void log_applied_actions(const struct current_action_spec *actions)
778 {
779    /*
780     * The conversion to text requires lots of memory allocations so
781     * we only do the conversion if the user is actually interested.
782     */
783    if (debug_level_is_enabled(LOG_LEVEL_ACTIONS))
784    {
785       char *actions_as_text = actions_to_line_of_text(actions);
786       log_error(LOG_LEVEL_ACTIONS, "%s", actions_as_text);
787       freez(actions_as_text);
788    }
789 }
790
791
792 /*********************************************************************
793  *
794  * Function    :  send_crunch_response
795  *
796  * Description :  Delivers already prepared response for
797  *                intercepted requests, logs the interception
798  *                and frees the response.
799  *
800  * Parameters  :
801  *          1  :  csp = Current client state (buffers, headers, etc...)
802  *          2  :  rsp = Fully prepared response. Will be freed on exit.
803  *
804  * Returns     :  Nothing.
805  *
806  *********************************************************************/
807 static void send_crunch_response(struct client_state *csp, struct http_response *rsp)
808 {
809       const struct http_request *http = csp->http;
810       char status_code[4];
811
812       assert(rsp != NULL);
813       assert(rsp->head != NULL);
814
815       if (rsp == NULL)
816       {
817          log_error(LOG_LEVEL_FATAL, "NULL response in send_crunch_response.");
818       }
819
820       /*
821        * Extract the status code from the actual head
822        * that will be send to the client. It is the only
823        * way to get it right for all requests, including
824        * the fixed ones for out-of-memory problems.
825        *
826        * A head starts like this: 'HTTP/1.1 200...'
827        *                           0123456789|11
828        *                                     10
829        */
830       status_code[0] = rsp->head[9];
831       status_code[1] = rsp->head[10];
832       status_code[2] = rsp->head[11];
833       status_code[3] = '\0';
834
835       /* Log that the request was crunched and why. */
836       log_applied_actions(csp->action);
837 #ifdef FEATURE_HTTPS_INSPECTION
838       if (client_use_ssl(csp))
839       {
840          log_error(LOG_LEVEL_CRUNCH, "%s: https://%s%s", crunch_reason(rsp),
841             http->hostport, http->path);
842          log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s https://%s%s %s\" %s %lu",
843             csp->ip_addr_str, http->gpc, http->hostport, http->path,
844             http->version, status_code, rsp->content_length);
845       }
846       else
847 #endif
848       {
849          log_error(LOG_LEVEL_CRUNCH, "%s: %s", crunch_reason(rsp), http->url);
850          log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %lu",
851             csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
852       }
853       /* Write the answer to the client */
854 #ifdef FEATURE_HTTPS_INSPECTION
855       if (client_use_ssl(csp))
856       {
857          if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
858                 (const unsigned char *)rsp->head, rsp->head_length,
859                 get_write_delay(csp)) < 0)
860           || (ssl_send_data_delayed(&(csp->ssl_client_attr),
861                 (const unsigned char *)rsp->body, rsp->content_length,
862                 get_write_delay(csp)) < 0))
863          {
864             /* There is nothing we can do about it. */
865             log_error(LOG_LEVEL_CONNECT, "Couldn't deliver the error message "
866                "for https://%s%s through client socket %d using TLS/SSL",
867                http->hostport, http->url, csp->cfd);
868          }
869       }
870       else
871 #endif
872       {
873          if (write_socket_delayed(csp->cfd, rsp->head, rsp->head_length,
874                 get_write_delay(csp))
875           || write_socket_delayed(csp->cfd, rsp->body, rsp->content_length,
876                 get_write_delay(csp)))
877          {
878             /* There is nothing we can do about it. */
879             log_error(LOG_LEVEL_CONNECT,
880                "Couldn't deliver the error message for %s through client socket %d: %E",
881                http->url, csp->cfd);
882          }
883       }
884
885       /* Clean up and return */
886       if (cgi_error_memory() != rsp)
887       {
888          free_http_response(rsp);
889       }
890       return;
891 }
892
893
894 /*********************************************************************
895  *
896  * Function    :  crunch_response_triggered
897  *
898  * Description :  Checks if the request has to be crunched,
899  *                and delivers the crunch response if necessary.
900  *
901  * Parameters  :
902  *          1  :  csp = Current client state (buffers, headers, etc...)
903  *          2  :  crunchers = list of cruncher functions to run
904  *
905  * Returns     :  TRUE if the request was answered with a crunch response
906  *                FALSE otherwise.
907  *
908  *********************************************************************/
909 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
910 {
911    struct http_response *rsp = NULL;
912    const struct cruncher *c;
913
914    /*
915     * If CGI request crunching is disabled,
916     * check the CGI dispatcher out of order to
917     * prevent unintentional blocks or redirects.
918     */
919    if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
920        && (NULL != (rsp = dispatch_cgi(csp))))
921    {
922       /* Deliver, log and free the interception response. */
923       send_crunch_response(csp, rsp);
924       csp->flags |= CSP_FLAG_CRUNCHED;
925       return TRUE;
926    }
927
928    for (c = crunchers; c->cruncher != NULL; c++)
929    {
930       /*
931        * Check the cruncher if either Privoxy is toggled
932        * on and the request isn't forced, or if the cruncher
933        * applies to forced requests as well.
934        */
935       if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
936           !(csp->flags & CSP_FLAG_FORCED)) ||
937           (c->flags & CF_IGNORE_FORCE))
938       {
939          rsp = c->cruncher(csp);
940          if (NULL != rsp)
941          {
942             /* Deliver, log and free the interception response. */
943             send_crunch_response(csp, rsp);
944             csp->flags |= CSP_FLAG_CRUNCHED;
945 #ifdef FEATURE_STATISTICS
946             if (c->flags & CF_COUNT_AS_REJECT)
947             {
948                csp->flags |= CSP_FLAG_REJECTED;
949             }
950 #endif /* def FEATURE_STATISTICS */
951
952             return TRUE;
953          }
954       }
955    }
956
957    return FALSE;
958 }
959
960
961 /*********************************************************************
962  *
963  * Function    :  build_request_line
964  *
965  * Description :  Builds the HTTP request line.
966  *
967  *                If a HTTP forwarder is used it expects the whole URL,
968  *                web servers only get the path.
969  *
970  * Parameters  :
971  *          1  :  csp = Current client state (buffers, headers, etc...)
972  *          2  :  fwd = The forwarding spec used for the request.
973  *                      Can be NULL.
974  *          3  :  request_line = The old request line which will be replaced.
975  *
976  * Returns     :  Nothing. Terminates in case of memory problems.
977  *
978  *********************************************************************/
979 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
980 {
981    struct http_request *http = csp->http;
982
983    /*
984     * Downgrade http version from 1.1 to 1.0
985     * if +downgrade action applies.
986     */
987    if ((csp->action->flags & ACTION_DOWNGRADE)
988      && (!strcmpic(http->version, "HTTP/1.1")))
989    {
990       freez(http->version);
991       http->version = strdup_or_die("HTTP/1.0");
992    }
993
994    /*
995     * Rebuild the request line.
996     */
997    freez(*request_line);
998 #ifdef FEATURE_HTTPS_INSPECTION
999    if (fwd != NULL && fwd->forward_host &&
1000        fwd->type != FORWARD_WEBSERVER && client_use_ssl(csp))
1001    {
1002       *request_line = strdup("CONNECT ");
1003    }
1004    else
1005 #endif
1006    {
1007       *request_line = strdup(http->gpc);
1008       string_append(request_line, " ");
1009    }
1010
1011    if (fwd != NULL && fwd->forward_host && fwd->type != FORWARD_WEBSERVER)
1012    {
1013 #ifdef FEATURE_HTTPS_INSPECTION
1014       if (client_use_ssl(csp))
1015       {
1016          char port_string[10];
1017
1018          string_append(request_line, http->host);
1019          snprintf(port_string, sizeof(port_string), ":%d", http->port);
1020          string_append(request_line, port_string);
1021       }
1022       else
1023 #endif
1024       {
1025          string_append(request_line, http->url);
1026       }
1027    }
1028    else
1029    {
1030       string_append(request_line, http->path);
1031    }
1032    string_append(request_line, " ");
1033    string_append(request_line, http->version);
1034
1035    if (*request_line == NULL)
1036    {
1037       log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
1038    }
1039    log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
1040 }
1041
1042
1043 /*********************************************************************
1044  *
1045  * Function    :  change_request_destination
1046  *
1047  * Description :  Parse a (rewritten) request line and regenerate
1048  *                the http request data.
1049  *
1050  * Parameters  :
1051  *          1  :  csp = Current client state (buffers, headers, etc...)
1052  *
1053  * Returns     :  Forwards the parse_http_request() return code.
1054  *                Terminates in case of memory problems.
1055  *
1056  *********************************************************************/
1057 static jb_err change_request_destination(struct client_state *csp)
1058 {
1059    struct http_request *http = csp->http;
1060    jb_err err;
1061
1062    log_error(LOG_LEVEL_REDIRECTS, "Rewrite detected: %s",
1063       csp->headers->first->str);
1064    free_http_request(http);
1065    err = parse_http_request(csp->headers->first->str, http);
1066    if (JB_ERR_OK != err)
1067    {
1068       log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
1069          jb_err_to_string(err));
1070    }
1071    if (http->ssl && strcmpic(csp->http->gpc, "CONNECT"))
1072    {
1073       /*
1074        * A client header filter changed the request URL from
1075        * http:// to https:// which we currently don't support.
1076        */
1077       log_error(LOG_LEVEL_ERROR, "Changing the request destination from http "
1078          "to https behind the client's back currently isn't supported.");
1079       return JB_ERR_PARSE;
1080    }
1081
1082    return err;
1083 }
1084
1085
1086 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1087 /*********************************************************************
1088  *
1089  * Function    :  server_response_is_complete
1090  *
1091  * Description :  Determines whether we should stop reading
1092  *                from the server socket.
1093  *
1094  * Parameters  :
1095  *          1  :  csp = Current client state (buffers, headers, etc...)
1096  *          2  :  content_length = Length of content received so far.
1097  *
1098  * Returns     :  TRUE if the response is complete,
1099  *                FALSE otherwise.
1100  *
1101  *********************************************************************/
1102 static int server_response_is_complete(struct client_state *csp,
1103    unsigned long long content_length)
1104 {
1105    int content_length_known = !!(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET);
1106
1107    if (!strcmpic(csp->http->gpc, "HEAD"))
1108    {
1109       /*
1110        * "HEAD" implies no body, we are thus expecting
1111        * no content. XXX: incomplete "list" of methods?
1112        */
1113       csp->expected_content_length = 0;
1114       content_length_known = TRUE;
1115       csp->flags |= CSP_FLAG_SERVER_CONTENT_LENGTH_SET;
1116    }
1117
1118    if (csp->http->status == 204 || csp->http->status == 304)
1119    {
1120       /*
1121        * Expect no body. XXX: incomplete "list" of status codes?
1122        */
1123       csp->expected_content_length = 0;
1124       content_length_known = TRUE;
1125       csp->flags |= CSP_FLAG_SERVER_CONTENT_LENGTH_SET;
1126    }
1127
1128    return (content_length_known && ((0 == csp->expected_content_length)
1129             || (csp->expected_content_length <= content_length)));
1130 }
1131
1132
1133 #ifdef FEATURE_CONNECTION_SHARING
1134 /*********************************************************************
1135  *
1136  * Function    :  wait_for_alive_connections
1137  *
1138  * Description :  Waits for alive connections to timeout.
1139  *
1140  * Parameters  :  N/A
1141  *
1142  * Returns     :  N/A
1143  *
1144  *********************************************************************/
1145 static void wait_for_alive_connections(void)
1146 {
1147    int connections_alive = close_unusable_connections();
1148
1149    while (0 < connections_alive)
1150    {
1151       log_error(LOG_LEVEL_CONNECT,
1152          "Waiting for %d connections to timeout.",
1153          connections_alive);
1154       sleep(60);
1155       connections_alive = close_unusable_connections();
1156    }
1157
1158    log_error(LOG_LEVEL_CONNECT, "No connections to wait for left.");
1159
1160 }
1161 #endif /* def FEATURE_CONNECTION_SHARING */
1162
1163
1164 /*********************************************************************
1165  *
1166  * Function    :  save_connection_destination
1167  *
1168  * Description :  Remembers a connection for reuse later on.
1169  *
1170  * Parameters  :
1171  *          1  :  sfd  = Open socket to remember.
1172  *          2  :  http = The destination for the connection.
1173  *          3  :  fwd  = The forwarder settings used.
1174  *          4  :  server_connection  = storage.
1175  *
1176  * Returns     : void
1177  *
1178  *********************************************************************/
1179 static void save_connection_destination(jb_socket sfd,
1180                                         const struct http_request *http,
1181                                         const struct forward_spec *fwd,
1182                                         struct reusable_connection *server_connection)
1183 {
1184    assert(sfd != JB_INVALID_SOCKET);
1185    assert(NULL != http->host);
1186
1187    server_connection->sfd = sfd;
1188    server_connection->host = strdup_or_die(http->host);
1189    server_connection->port = http->port;
1190
1191    assert(NULL != fwd);
1192    assert(server_connection->gateway_host == NULL);
1193    assert(server_connection->gateway_port == 0);
1194    assert(server_connection->forwarder_type == 0);
1195    assert(server_connection->forward_host == NULL);
1196    assert(server_connection->forward_port == 0);
1197
1198    server_connection->forwarder_type = fwd->type;
1199    if (NULL != fwd->gateway_host)
1200    {
1201       server_connection->gateway_host = strdup_or_die(fwd->gateway_host);
1202    }
1203    else
1204    {
1205       server_connection->gateway_host = NULL;
1206    }
1207    server_connection->gateway_port = fwd->gateway_port;
1208    if (NULL != fwd->auth_username)
1209    {
1210       server_connection->auth_username = strdup_or_die(fwd->auth_username);
1211    }
1212    else
1213    {
1214       server_connection->auth_username = NULL;
1215    }
1216    if (NULL != fwd->auth_password)
1217    {
1218       server_connection->auth_password = strdup_or_die(fwd->auth_password);
1219    }
1220    else
1221    {
1222       server_connection->auth_password = NULL;
1223    }
1224
1225    if (NULL != fwd->forward_host)
1226    {
1227       server_connection->forward_host = strdup_or_die(fwd->forward_host);
1228    }
1229    else
1230    {
1231       server_connection->forward_host = NULL;
1232    }
1233    server_connection->forward_port = fwd->forward_port;
1234 }
1235 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
1236
1237
1238 /*********************************************************************
1239  *
1240  * Function    : verify_request_length
1241  *
1242  * Description : Checks if we already got the whole client requests
1243  *               and sets CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ if
1244  *               we do.
1245  *
1246  *               Data that doesn't belong to the current request is
1247  *               either thrown away to let the client retry on a clean
1248  *               socket, or stashed to be dealt with after the current
1249  *               request is served.
1250  *
1251  * Parameters  :
1252  *          1  :  csp = Current client state (buffers, headers, etc...)
1253  *
1254  * Returns     :  void
1255  *
1256  *********************************************************************/
1257 static void verify_request_length(struct client_state *csp)
1258 {
1259    unsigned long long buffered_request_bytes =
1260       (unsigned long long)(csp->client_iob->eod - csp->client_iob->cur);
1261
1262    if ((csp->expected_client_content_length != 0)
1263       && (buffered_request_bytes != 0))
1264    {
1265       if (csp->expected_client_content_length >= buffered_request_bytes)
1266       {
1267          csp->expected_client_content_length -= buffered_request_bytes;
1268          log_error(LOG_LEVEL_CONNECT, "Reduced expected bytes to %llu "
1269             "to account for the %llu ones we already got.",
1270             csp->expected_client_content_length, buffered_request_bytes);
1271       }
1272       else
1273       {
1274          assert(csp->client_iob->eod > csp->client_iob->cur + csp->expected_client_content_length);
1275          csp->client_iob->eod = csp->client_iob->cur + csp->expected_client_content_length;
1276          log_error(LOG_LEVEL_CONNECT, "Reducing expected bytes to 0. "
1277             "Marking the server socket tainted after throwing %llu bytes away.",
1278             buffered_request_bytes - csp->expected_client_content_length);
1279          csp->expected_client_content_length = 0;
1280          csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1281       }
1282
1283       if (csp->expected_client_content_length == 0)
1284       {
1285          csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1286       }
1287    }
1288
1289    if (!(csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ)
1290       && ((csp->client_iob->cur < csp->client_iob->eod)
1291          || (csp->expected_client_content_length != 0)))
1292    {
1293       if (strcmpic(csp->http->gpc, "GET")
1294          && strcmpic(csp->http->gpc, "HEAD")
1295          && strcmpic(csp->http->gpc, "TRACE")
1296          && strcmpic(csp->http->gpc, "OPTIONS")
1297          && strcmpic(csp->http->gpc, "DELETE"))
1298       {
1299          /* XXX: this is an incomplete hack */
1300          csp->flags &= ~CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1301          log_error(LOG_LEVEL_CONNECT, "There better be a request body.");
1302       }
1303       else
1304       {
1305          csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1306
1307          if ((csp->config->feature_flags & RUNTIME_FEATURE_TOLERATE_PIPELINING) == 0)
1308          {
1309             csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1310             log_error(LOG_LEVEL_CONNECT,
1311                "Possible pipeline attempt detected. The connection will not "
1312                "be kept alive and we will only serve the first request.");
1313             /* Nuke the pipelined requests from orbit, just to be sure. */
1314             clear_iob(csp->client_iob);
1315          }
1316          else
1317          {
1318             /*
1319              * Keep the pipelined data around for now, we'll deal with
1320              * it once we're done serving the current request.
1321              */
1322             csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
1323             assert(csp->client_iob->eod >= csp->client_iob->cur);
1324             log_error(LOG_LEVEL_CONNECT, "Complete client request followed by "
1325                "%d bytes of pipelined data received.",
1326                (int)(csp->client_iob->eod - csp->client_iob->cur));
1327          }
1328       }
1329    }
1330    else
1331    {
1332       csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1333       log_error(LOG_LEVEL_CONNECT, "Complete client request received.");
1334    }
1335 }
1336
1337
1338 /*********************************************************************
1339  *
1340  * Function    :  mark_server_socket_tainted
1341  *
1342  * Description :  Makes sure we don't reuse a server socket
1343  *                (if we didn't read everything the server sent
1344  *                us reusing the socket would lead to garbage).
1345  *
1346  * Parameters  :
1347  *          1  :  csp = Current client state (buffers, headers, etc...)
1348  *
1349  * Returns     :  void.
1350  *
1351  *********************************************************************/
1352 static void mark_server_socket_tainted(struct client_state *csp)
1353 {
1354    /*
1355     * For consistency we always mark the server socket
1356     * tainted, however, to reduce the log noise we only
1357     * emit a log message if the server socket could have
1358     * actually been reused.
1359     */
1360    if ((csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE)
1361       && !(csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED))
1362    {
1363       log_error(LOG_LEVEL_CONNECT,
1364          "Marking the server socket %d tainted.",
1365          csp->server_connection.sfd);
1366    }
1367    csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1368 }
1369
1370 /*********************************************************************
1371  *
1372  * Function    :  get_request_line
1373  *
1374  * Description : Read the client request line.
1375  *
1376  * Parameters  :
1377  *          1  :  csp = Current client state (buffers, headers, etc...)
1378  *
1379  * Returns     :  Pointer to request line or NULL in case of errors.
1380  *
1381  *********************************************************************/
1382 static char *get_request_line(struct client_state *csp)
1383 {
1384    char buf[BUFFER_SIZE];
1385    char *request_line = NULL;
1386    int len;
1387
1388    memset(buf, 0, sizeof(buf));
1389
1390    if ((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) != 0)
1391    {
1392       /*
1393        * If there are multiple pipelined requests waiting,
1394        * the flag will be set again once the next request
1395        * has been parsed.
1396        */
1397       csp->flags &= ~CSP_FLAG_PIPELINED_REQUEST_WAITING;
1398
1399       request_line = get_header(csp->client_iob);
1400       if ((NULL != request_line) && ('\0' != *request_line))
1401       {
1402          return request_line;
1403       }
1404       else
1405       {
1406          log_error(LOG_LEVEL_CONNECT, "No complete request line "
1407             "received yet. Continuing reading from %d.", csp->cfd);
1408       }
1409    }
1410
1411    do
1412    {
1413       if (
1414 #ifdef FUZZ
1415           0 == (csp->flags & CSP_FLAG_FUZZED_INPUT) &&
1416 #endif
1417           !data_is_available(csp->cfd, csp->config->socket_timeout)
1418           )
1419       {
1420          if (socket_is_still_alive(csp->cfd))
1421          {
1422             log_error(LOG_LEVEL_CONNECT,
1423                "No request line on socket %d received in time. Timeout: %d.",
1424                csp->cfd, csp->config->socket_timeout);
1425             write_socket_delayed(csp->cfd, CLIENT_CONNECTION_TIMEOUT_RESPONSE,
1426                strlen(CLIENT_CONNECTION_TIMEOUT_RESPONSE),
1427                get_write_delay(csp));
1428          }
1429          else
1430          {
1431             log_error(LOG_LEVEL_CONNECT,
1432                "The client side of the connection on socket %d got "
1433                "closed without sending a complete request line.", csp->cfd);
1434          }
1435          return NULL;
1436       }
1437
1438       len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1439
1440       if (len <= 0) return NULL;
1441
1442       /*
1443        * If there is no memory left for buffering the
1444        * request, there is nothing we can do but hang up
1445        */
1446       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1447       {
1448          return NULL;
1449       }
1450
1451       request_line = get_header(csp->client_iob);
1452
1453    } while ((NULL != request_line) && ('\0' == *request_line));
1454
1455    return request_line;
1456
1457 }
1458
1459 enum chunk_status
1460 {
1461    CHUNK_STATUS_MISSING_DATA,
1462    CHUNK_STATUS_BODY_COMPLETE,
1463    CHUNK_STATUS_PARSE_ERROR
1464 };
1465
1466
1467 /*********************************************************************
1468  *
1469  * Function    :  chunked_body_is_complete
1470  *
1471  * Description :  Figures out whether or not a chunked body is complete.
1472  *
1473  *                Currently it always starts at the beginning of the
1474  *                buffer which is somewhat wasteful and prevents Privoxy
1475  *                from starting to forward the correctly parsed chunks
1476  *                as soon as theoretically possible.
1477  *
1478  *                Should be modified to work with a common buffer,
1479  *                and allow the caller to skip already parsed chunks.
1480  *
1481  *                This would allow the function to be used for unbuffered
1482  *                response bodies as well.
1483  *
1484  * Parameters  :
1485  *          1  :  iob = Buffer with the body to check.
1486  *          2  :  length = Length of complete body
1487  *
1488  * Returns     :  Enum with the result of the check.
1489  *
1490  *********************************************************************/
1491 static enum chunk_status chunked_body_is_complete(struct iob *iob, size_t *length)
1492 {
1493    unsigned int chunksize;
1494    char *p = iob->cur;
1495
1496    do
1497    {
1498       /*
1499        * We need at least a single digit, followed by "\r\n",
1500        * followed by an unknown amount of data, followed by "\r\n".
1501        */
1502       if (p + 5 > iob->eod)
1503       {
1504          return CHUNK_STATUS_MISSING_DATA;
1505       }
1506       if (sscanf(p, "%x", &chunksize) != 1)
1507       {
1508          return CHUNK_STATUS_PARSE_ERROR;
1509       }
1510
1511       /*
1512        * We want at least a single digit, followed by "\r\n",
1513        * followed by the specified amount of data, followed by "\r\n".
1514        */
1515       if (p + chunksize + 5 > iob->eod)
1516       {
1517          return CHUNK_STATUS_MISSING_DATA;
1518       }
1519
1520       /* Skip chunk-size. */
1521       p = strstr(p, "\r\n");
1522       if (NULL == p)
1523       {
1524          return CHUNK_STATUS_PARSE_ERROR;
1525       }
1526       /* Move beyond the chunkdata. */
1527       p += 2 + chunksize;
1528
1529       /* Make sure we're still within the buffer and have two bytes left */
1530       if (p + 2 > iob->eod)
1531       {
1532          return CHUNK_STATUS_MISSING_DATA;
1533       }
1534
1535       /* There should be another "\r\n" to skip */
1536       if (memcmp(p, "\r\n", 2))
1537       {
1538          return CHUNK_STATUS_PARSE_ERROR;
1539       }
1540       p += 2;
1541    } while (chunksize > 0U);
1542
1543    *length = (size_t)(p - iob->cur);
1544    assert(*length <= (size_t)(iob->eod - iob->cur));
1545    assert(p <= iob->eod);
1546
1547    return CHUNK_STATUS_BODY_COMPLETE;
1548
1549 }
1550
1551
1552 /*********************************************************************
1553  *
1554  * Function    : receive_chunked_client_request_body
1555  *
1556  * Description : Read the chunk-encoded client request body.
1557  *               Failures are dealt with.
1558  *
1559  * Parameters  :
1560  *          1  :  csp = Current client state (buffers, headers, etc...)
1561  *
1562  * Returns     :  JB_ERR_OK or JB_ERR_PARSE
1563  *
1564  *********************************************************************/
1565 static jb_err receive_chunked_client_request_body(struct client_state *csp)
1566 {
1567    size_t body_length;
1568    enum chunk_status status;
1569
1570    while (CHUNK_STATUS_MISSING_DATA ==
1571       (status = chunked_body_is_complete(csp->client_iob, &body_length)))
1572    {
1573       char buf[BUFFER_SIZE];
1574       int len;
1575
1576       if (!data_is_available(csp->cfd, csp->config->socket_timeout))
1577       {
1578          log_error(LOG_LEVEL_ERROR,
1579             "Timeout while waiting for the client body.");
1580          break;
1581       }
1582       len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1583       if (len <= 0)
1584       {
1585          log_error(LOG_LEVEL_ERROR,
1586             "Reading the client body failed: %E");
1587          break;
1588       }
1589       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1590       {
1591          break;
1592       }
1593    }
1594    if (status != CHUNK_STATUS_BODY_COMPLETE)
1595    {
1596       write_socket_delayed(csp->cfd, CLIENT_BODY_PARSE_ERROR_RESPONSE,
1597          strlen(CLIENT_BODY_PARSE_ERROR_RESPONSE), get_write_delay(csp));
1598       log_error(LOG_LEVEL_CLF,
1599          "%s - - [%T] \"Failed reading chunked client body\" 400 0", csp->ip_addr_str);
1600       return JB_ERR_PARSE;
1601    }
1602    log_error(LOG_LEVEL_CONNECT,
1603       "Chunked client body completely read. Length: %lu", body_length);
1604    csp->expected_client_content_length = body_length;
1605
1606    return JB_ERR_OK;
1607
1608 }
1609
1610
1611 #ifdef FUZZ
1612 /*********************************************************************
1613  *
1614  * Function    :  fuzz_chunked_transfer_encoding
1615  *
1616  * Description :  Treat the fuzzed input as chunked transfer encoding
1617  *                to check and dechunk.
1618  *
1619  * Parameters  :
1620  *          1  :  csp      = Used to store the data.
1621  *          2  :  fuzz_input_file = File to read the input from.
1622  *
1623  * Returns     : Result of dechunking
1624  *
1625  *********************************************************************/
1626 extern int fuzz_chunked_transfer_encoding(struct client_state *csp, char *fuzz_input_file)
1627 {
1628    size_t length;
1629    size_t size = (size_t)(csp->iob->eod - csp->iob->cur);
1630    enum chunk_status status;
1631
1632    status = chunked_body_is_complete(csp->iob, &length);
1633    if (CHUNK_STATUS_BODY_COMPLETE != status)
1634    {
1635       log_error(LOG_LEVEL_INFO, "Chunked body is incomplete or invalid");
1636    }
1637
1638    return (JB_ERR_OK == remove_chunked_transfer_coding(csp->iob->cur, &size));
1639
1640 }
1641
1642
1643 /*********************************************************************
1644  *
1645  * Function    : fuzz_client_request
1646  *
1647  * Description : Try to get a client request from the fuzzed input.
1648  *
1649  * Parameters  :
1650  *          1  :  csp = Current client state (buffers, headers, etc...)
1651  *          2  :  fuzz_input_file = File to read the input from.
1652  *
1653  * Returns     :  Result of fuzzing.
1654  *
1655  *********************************************************************/
1656 extern int fuzz_client_request(struct client_state *csp, char *fuzz_input_file)
1657 {
1658    jb_err err;
1659
1660    csp->cfd = 0;
1661    csp->ip_addr_str = "fuzzer";
1662
1663    if (strcmp(fuzz_input_file, "-") != 0)
1664    {
1665       log_error(LOG_LEVEL_FATAL,
1666          "Fuzzed client requests can currently only be read from stdin (-).");
1667    }
1668    err = receive_client_request(csp);
1669    if (err != JB_ERR_OK)
1670    {
1671       return 1;
1672    }
1673    err = parse_client_request(csp);
1674    if (err != JB_ERR_OK)
1675    {
1676       return 1;
1677    }
1678
1679    return 0;
1680
1681 }
1682 #endif  /* def FUZZ */
1683
1684
1685 #ifdef FEATURE_FORCE_LOAD
1686 /*********************************************************************
1687  *
1688  * Function    :  force_required
1689  *
1690  * Description : Checks a request line to see if it contains
1691  *               the FORCE_PREFIX. If it does, it is removed
1692  *               unless enforcing requests has beend disabled.
1693  *
1694  * Parameters  :
1695  *          1  :  request_line = HTTP request line
1696  *
1697  * Returns     :  TRUE if force is required, FALSE otherwise.
1698  *
1699  *********************************************************************/
1700 static int force_required(const struct client_state *csp, char *request_line)
1701 {
1702    char *p;
1703
1704    p = strstr(request_line, "http://");
1705    if (p != NULL)
1706    {
1707       /* Skip protocol */
1708       p += strlen("http://");
1709    }
1710    else
1711    {
1712       /* Intercepted request usually don't specify the protocol. */
1713       p = request_line;
1714    }
1715
1716    /* Go to the beginning of the path */
1717    p = strstr(p, "/");
1718    if (p == NULL)
1719    {
1720       /*
1721        * If the path is missing the request line is invalid and we
1722        * are done here. The client-visible rejection happens later on.
1723        */
1724       return 0;
1725    }
1726
1727    if (0 == strncmpic(p, FORCE_PREFIX, strlen(FORCE_PREFIX) - 1))
1728    {
1729       if (!(csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS))
1730       {
1731          /* XXX: Should clean more carefully */
1732          strclean(request_line, FORCE_PREFIX);
1733          log_error(LOG_LEVEL_FORCE,
1734             "Enforcing request: \"%s\".", request_line);
1735
1736          return 1;
1737       }
1738       log_error(LOG_LEVEL_FORCE,
1739          "Ignored force prefix in request: \"%s\".", request_line);
1740    }
1741
1742    return 0;
1743
1744 }
1745 #endif /* def FEATURE_FORCE_LOAD */
1746
1747
1748 /*********************************************************************
1749  *
1750  * Function    :  receive_client_request
1751  *
1752  * Description : Read the client's request (more precisely the
1753  *               client headers) and answer it if necessary.
1754  *
1755  * Parameters  :
1756  *          1  :  csp = Current client state (buffers, headers, etc...)
1757  *
1758  * Returns     :  JB_ERR_OK, JB_ERR_PARSE or JB_ERR_MEMORY
1759  *
1760  *********************************************************************/
1761 static jb_err receive_client_request(struct client_state *csp)
1762 {
1763    char buf[BUFFER_SIZE];
1764    char *p;
1765    char *req = NULL;
1766    struct http_request *http;
1767    int len;
1768    jb_err err;
1769
1770    /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1771    struct list header_list;
1772    struct list *headers = &header_list;
1773
1774    /* We don't care if the arriving data is a valid HTTP request or not. */
1775    csp->requests_received_total++;
1776
1777    http = csp->http;
1778
1779    memset(buf, 0, sizeof(buf));
1780
1781    req = get_request_line(csp);
1782    if (req == NULL)
1783    {
1784       mark_server_socket_tainted(csp);
1785       return JB_ERR_PARSE;
1786    }
1787    assert(*req != '\0');
1788
1789    if (client_protocol_is_unsupported(csp, req))
1790    {
1791       return JB_ERR_PARSE;
1792    }
1793
1794 #ifdef FEATURE_FORCE_LOAD
1795    if (force_required(csp, req))
1796    {
1797       csp->flags |= CSP_FLAG_FORCED;
1798    }
1799 #endif /* def FEATURE_FORCE_LOAD */
1800
1801    err = parse_http_request(req, http);
1802    freez(req);
1803    if (JB_ERR_OK != err)
1804    {
1805       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER),
1806          get_write_delay(csp));
1807       /* XXX: Use correct size */
1808       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1809       log_error(LOG_LEVEL_ERROR,
1810          "Couldn't parse request line received from %s: %s",
1811          csp->ip_addr_str, jb_err_to_string(err));
1812
1813       free_http_request(http);
1814       return JB_ERR_PARSE;
1815    }
1816    if (http->ssl && strcmpic(http->gpc, "CONNECT"))
1817    {
1818       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER),
1819          get_write_delay(csp));
1820       /* XXX: Use correct size */
1821       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0",
1822          csp->ip_addr_str);
1823       log_error(LOG_LEVEL_ERROR, "Client %s tried to send a https "
1824          "URL without sending a CONNECT request first",
1825          csp->ip_addr_str);
1826       free_http_request(http);
1827       return JB_ERR_PARSE;
1828    }
1829
1830    /* grab the rest of the client's headers */
1831    init_list(headers);
1832    for (;;)
1833    {
1834       p = get_header(csp->client_iob);
1835
1836       if (p == NULL)
1837       {
1838          /* There are no additional headers to read. */
1839          break;
1840       }
1841
1842       if (*p == '\0')
1843       {
1844          /*
1845           * We didn't receive a complete header
1846           * line yet, get the rest of it.
1847           */
1848          if (!data_is_available(csp->cfd, csp->config->socket_timeout))
1849          {
1850             log_error(LOG_LEVEL_ERROR,
1851                "Client headers did not arrive in time. Timeout: %d",
1852                csp->config->socket_timeout);
1853             destroy_list(headers);
1854             return JB_ERR_PARSE;
1855          }
1856
1857          len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1858          if (len <= 0)
1859          {
1860             log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
1861             destroy_list(headers);
1862             return JB_ERR_PARSE;
1863          }
1864
1865          if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1866          {
1867             /*
1868              * If there is no memory left for buffering the
1869              * request, there is nothing we can do but hang up
1870              */
1871             destroy_list(headers);
1872             return JB_ERR_MEMORY;
1873          }
1874       }
1875       else
1876       {
1877          if (!strncmpic(p, "Transfer-Encoding:", 18))
1878          {
1879             /*
1880              * XXX: should be called through sed()
1881              *      but currently can't.
1882              */
1883             client_transfer_encoding(csp, &p);
1884          }
1885          /*
1886           * We were able to read a complete
1887           * header and can finally enlist it.
1888           */
1889          enlist(headers, p);
1890          freez(p);
1891       }
1892    }
1893
1894    if (http->host == NULL)
1895    {
1896       /*
1897        * If we still don't know the request destination,
1898        * the request is invalid or the client uses
1899        * Privoxy without its knowledge.
1900        */
1901       if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
1902       {
1903          /*
1904           * Our attempts to get the request destination
1905           * elsewhere failed or Privoxy is configured
1906           * to only accept proxy requests.
1907           *
1908           * An error response has already been sent
1909           * and we're done here.
1910           */
1911          return JB_ERR_PARSE;
1912       }
1913    }
1914
1915 #ifdef FEATURE_CLIENT_TAGS
1916    /* XXX: If the headers were enlisted sooner, passing csp would do. */
1917    set_client_address(csp, headers);
1918    get_tag_list_for_client(csp->client_tags, csp->client_address);
1919 #endif
1920
1921    /*
1922     * Determine the actions for this URL
1923     */
1924 #ifdef FEATURE_TOGGLE
1925    if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
1926    {
1927       /* Most compatible set of actions (i.e. none) */
1928       init_current_action(csp->action);
1929    }
1930    else
1931 #endif /* ndef FEATURE_TOGGLE */
1932    {
1933       get_url_actions(csp, http);
1934    }
1935
1936    enlist(csp->headers, http->cmd);
1937
1938    /* Append the previously read headers */
1939    err = list_append_list_unique(csp->headers, headers);
1940    destroy_list(headers);
1941
1942    return err;
1943
1944 }
1945
1946
1947 /*********************************************************************
1948  *
1949  * Function    : parse_client_request
1950  *
1951  * Description : Parses the client's request and decides what to do
1952  *               with it.
1953  *
1954  *               Note that since we're not using select() we could get
1955  *               blocked here if a client connected, then didn't say
1956  *               anything!
1957  *
1958  * Parameters  :
1959  *          1  :  csp = Current client state (buffers, headers, etc...)
1960  *
1961  * Returns     :  JB_ERR_OK or JB_ERR_PARSE
1962  *
1963  *********************************************************************/
1964 static jb_err parse_client_request(struct client_state *csp)
1965 {
1966    struct http_request *http = csp->http;
1967    jb_err err;
1968
1969 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1970    if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
1971     && (!strcmpic(csp->http->version, "HTTP/1.1"))
1972     && (csp->http->ssl == 0))
1973    {
1974       /* Assume persistence until further notice */
1975       csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
1976    }
1977 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
1978
1979    if (csp->http->ssl == 0)
1980    {
1981       /*
1982        * This whole block belongs to chat() but currently
1983        * has to be executed before sed().
1984        */
1985       if (csp->flags & CSP_FLAG_CHUNKED_CLIENT_BODY)
1986       {
1987          if (receive_chunked_client_request_body(csp) != JB_ERR_OK)
1988          {
1989             return JB_ERR_PARSE;
1990          }
1991       }
1992       else
1993       {
1994          csp->expected_client_content_length = get_expected_content_length(csp->headers);
1995       }
1996       verify_request_length(csp);
1997    }
1998 #ifndef FEATURE_HTTPS_INSPECTION
1999    else
2000    {
2001       csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
2002    }
2003 #endif
2004
2005    err = sed(csp, FILTER_CLIENT_HEADERS);
2006    if (JB_ERR_OK != err)
2007    {
2008       log_error(LOG_LEVEL_ERROR, "Failed to parse client request from %s.",
2009          csp->ip_addr_str);
2010       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
2011          csp->ip_addr_str, csp->http->cmd);
2012       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER), get_write_delay(csp));
2013       return JB_ERR_PARSE;
2014    }
2015    csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2016
2017    /* Check request line for rewrites. */
2018    if ((NULL == csp->headers->first->str)
2019       || (strcmp(http->cmd, csp->headers->first->str) &&
2020          (JB_ERR_OK != change_request_destination(csp))))
2021    {
2022       /*
2023        * A header filter broke the request line - bail out.
2024        */
2025       write_socket_delayed(csp->cfd, MESSED_UP_REQUEST_RESPONSE,
2026          strlen(MESSED_UP_REQUEST_RESPONSE), get_write_delay(csp));
2027       /* XXX: Use correct size */
2028       log_error(LOG_LEVEL_CLF,
2029          "%s - - [%T] \"Invalid request generated\" 400 0", csp->ip_addr_str);
2030       log_error(LOG_LEVEL_ERROR,
2031          "Invalid request line after applying header filters.");
2032       free_http_request(http);
2033
2034       return JB_ERR_PARSE;
2035    }
2036
2037    if (client_has_unsupported_expectations(csp))
2038    {
2039       return JB_ERR_PARSE;
2040    }
2041
2042    return JB_ERR_OK;
2043
2044 }
2045
2046
2047 /*********************************************************************
2048  *
2049  * Function    : read_http_request_body
2050  *
2051  * Description : Reads remaining request body from the client.
2052  *
2053  * Parameters  :
2054  *          1  :  csp = Current client state (buffers, headers, etc...)
2055  *
2056  * Returns     :  0 on success, anything else is an error.
2057  *
2058  *********************************************************************/
2059 static int read_http_request_body(struct client_state *csp)
2060 {
2061    size_t to_read = csp->expected_client_content_length;
2062    int len;
2063
2064    assert(to_read != 0);
2065
2066    /* check if all data has been already read */
2067    if (to_read <= (csp->client_iob->eod - csp->client_iob->cur))
2068    {
2069       return 0;
2070    }
2071
2072    for (to_read -= (size_t)(csp->client_iob->eod - csp->client_iob->cur);
2073         to_read > 0 && data_is_available(csp->cfd, csp->config->socket_timeout);
2074         to_read -= (unsigned)len)
2075    {
2076       char buf[BUFFER_SIZE];
2077       size_t max_bytes_to_read = to_read < sizeof(buf) ? to_read : sizeof(buf);
2078
2079       log_error(LOG_LEVEL_CONNECT,
2080          "Waiting for up to %lu bytes of request body from the client.",
2081          max_bytes_to_read);
2082       len = read_socket(csp->cfd, buf, (int)max_bytes_to_read);
2083       if (len <= -1)
2084       {
2085          log_error(LOG_LEVEL_CONNECT, "Failed receiving request body from %s: %E", csp->ip_addr_str);
2086          return 1;
2087       }
2088       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, (char *)buf, len))
2089       {
2090          return 1;
2091       }
2092       assert(to_read >= len);
2093    }
2094
2095    if (to_read != 0)
2096    {
2097       log_error(LOG_LEVEL_CONNECT,
2098          "Not enough request body has been read: expected %lu more bytes",
2099          to_read);
2100       return 1;
2101    }
2102    log_error(LOG_LEVEL_CONNECT,
2103       "The last %d bytes of the request body have been read", len);
2104    return 0;
2105 }
2106
2107
2108 /*********************************************************************
2109  *
2110  * Function    : update_client_headers
2111  *
2112  * Description : Updates the HTTP headers from the client request.
2113  *
2114  * Parameters  :
2115  *          1  :  csp = Current client state (buffers, headers, etc...)
2116  *          2  :  new_content_length = new content length value to set
2117  *
2118  * Returns     :  0 on success, anything else is an error.
2119  *
2120  *********************************************************************/
2121 static int update_client_headers(struct client_state *csp, size_t new_content_length)
2122 {
2123    static const char content_length[] = "Content-Length:";
2124    int updated = 0;
2125    struct list_entry *p;
2126
2127 #ifndef FEATURE_HTTPS_INSPECTION
2128    for (p = csp->headers->first;
2129 #else
2130    for (p = csp->http->client_ssl ? csp->https_headers->first : csp->headers->first;
2131 #endif
2132         !updated  && (p != NULL); p = p->next)
2133    {
2134       /* Header crunch()ed in previous run? -> ignore */
2135       if (p->str == NULL)
2136       {
2137          continue;
2138       }
2139
2140       /* Does the current parser handle this header? */
2141       if (0 == strncmpic(p->str, content_length, sizeof(content_length) - 1))
2142       {
2143          updated = (JB_ERR_OK == header_adjust_content_length((char **)&(p->str), new_content_length));
2144          if (!updated)
2145          {
2146             return 1;
2147          }
2148       }
2149    }
2150
2151    return !updated;
2152 }
2153
2154
2155 /*********************************************************************
2156  *
2157  * Function    : can_filter_request_body
2158  *
2159  * Description : Checks if the current request body can be stored in
2160  *               the client_iob without hitting buffer limit.
2161  *
2162  * Parameters  :
2163  *          1  : csp = Current client state (buffers, headers, etc...)
2164  *
2165  * Returns     : TRUE if the current request size do not exceed buffer limit
2166  *               FALSE otherwise.
2167  *
2168  *********************************************************************/
2169 static int can_filter_request_body(const struct client_state *csp)
2170 {
2171    if (!can_add_to_iob(csp->client_iob, csp->config->buffer_limit,
2172                        csp->expected_client_content_length))
2173    {
2174       log_error(LOG_LEVEL_INFO,
2175          "Not filtering request body from %s: buffer limit %lu will be exceeded "
2176          "(content length %llu)", csp->ip_addr_str, csp->config->buffer_limit,
2177          csp->expected_client_content_length);
2178       return FALSE;
2179    }
2180    return TRUE;
2181 }
2182
2183
2184 /*********************************************************************
2185  *
2186  * Function    : send_http_request
2187  *
2188  * Description : Sends the HTTP headers from the client request
2189  *               and all the body data that has already been received.
2190  *
2191  * Parameters  :
2192  *          1  :  csp = Current client state (buffers, headers, etc...)
2193  *
2194  * Returns     :  0 on success, anything else is an error.
2195  *
2196  *********************************************************************/
2197 static int send_http_request(struct client_state *csp)
2198 {
2199    char *hdr;
2200    int write_failure;
2201    const char *to_send;
2202    size_t to_send_len;
2203    int filter_client_body = csp->expected_client_content_length != 0 &&
2204       client_body_filters_enabled(csp->action) && can_filter_request_body(csp);
2205
2206    if (filter_client_body)
2207    {
2208       if (read_http_request_body(csp))
2209       {
2210          return 1;
2211       }
2212       to_send_len = csp->expected_client_content_length;
2213       to_send = execute_client_body_filters(csp, &to_send_len);
2214       if (to_send == NULL)
2215       {
2216          /* just flush client_iob */
2217          filter_client_body = FALSE;
2218       }
2219       else if (to_send_len != csp->expected_client_content_length &&
2220          update_client_headers(csp, to_send_len))
2221       {
2222          log_error(LOG_LEVEL_HEADER, "Error updating client headers");
2223          freez(to_send);
2224          return 1;
2225       }
2226       csp->expected_client_content_length = 0;
2227    }
2228
2229    hdr = list_to_text(csp->headers);
2230    if (hdr == NULL)
2231    {
2232       /* FIXME Should handle error properly */
2233       log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2234    }
2235    list_remove_all(csp->headers);
2236
2237    /*
2238     * Write the client's (modified) header to the server
2239     * (along with anything else that may be in the buffer)
2240     */
2241    write_failure = 0 != write_socket(csp->server_connection.sfd, hdr, strlen(hdr));
2242    freez(hdr);
2243
2244    if (write_failure)
2245    {
2246       log_error(LOG_LEVEL_CONNECT, "Failed sending request headers to: %s: %E",
2247          csp->http->hostport);
2248       if (filter_client_body)
2249       {
2250          freez(to_send);
2251       }
2252       return 1;
2253    }
2254
2255    if (filter_client_body)
2256    {
2257       write_failure = 0 != write_socket(csp->server_connection.sfd, to_send, to_send_len);
2258       freez(to_send);
2259       if (write_failure)
2260       {
2261          log_error(LOG_LEVEL_CONNECT, "Failed sending filtered request body to: %s: %E",
2262             csp->http->hostport);
2263          return 1;
2264       }
2265    }
2266
2267    if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) == 0)
2268       && (flush_iob(csp->server_connection.sfd, csp->client_iob, 0) < 0))
2269    {
2270       log_error(LOG_LEVEL_CONNECT, "Failed sending request body to: %s: %E",
2271          csp->http->hostport);
2272       return 1;
2273    }
2274    return 0;
2275 }
2276
2277
2278 #ifdef FEATURE_HTTPS_INSPECTION
2279 /*********************************************************************
2280  *
2281  * Function    : read_https_request_body
2282  *
2283  * Description : Reads remaining request body from the client.
2284  *
2285  * Parameters  :
2286  *          1  :  csp = Current client state (buffers, headers, etc...)
2287  *
2288  * Returns     :  0 on success, anything else is an error.
2289  *
2290  *********************************************************************/
2291 static int read_https_request_body(struct client_state *csp)
2292 {
2293    size_t to_read = csp->expected_client_content_length;
2294    int len;
2295
2296    assert(to_read != 0);
2297
2298    /* check if all data has been already read */
2299    if (to_read <= (csp->client_iob->eod - csp->client_iob->cur))
2300    {
2301       return 0;
2302    }
2303
2304    for (to_read -= (size_t)(csp->client_iob->eod - csp->client_iob->cur);
2305         to_read > 0 && (is_ssl_pending(&(csp->ssl_client_attr)) ||
2306           data_is_available(csp->cfd, csp->config->socket_timeout));
2307         to_read -= (unsigned)len)
2308    {
2309       unsigned char buf[BUFFER_SIZE];
2310       size_t max_bytes_to_read = to_read < sizeof(buf) ? to_read : sizeof(buf);
2311
2312       log_error(LOG_LEVEL_CONNECT,
2313          "Waiting for up to %lu bytes of request body from the client.",
2314          max_bytes_to_read);
2315       len = ssl_recv_data(&(csp->ssl_client_attr), buf,
2316          (unsigned)max_bytes_to_read);
2317       if (len <= 0)
2318       {
2319          log_error(LOG_LEVEL_CONNECT, "Failed receiving request body from %s", csp->ip_addr_str);
2320          return 1;
2321       }
2322       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, (char *)buf, len))
2323       {
2324          return 1;
2325       }
2326       assert(to_read >= len);
2327    }
2328
2329    if (to_read != 0)
2330    {
2331       log_error(LOG_LEVEL_CONNECT,
2332          "Not enough request body has been read: expected %lu more bytes",
2333          to_read);
2334       return 1;
2335    }
2336
2337    log_error(LOG_LEVEL_CONNECT,
2338       "The last %llu bytes of the request body have been read",
2339       csp->expected_client_content_length);
2340    return 0;
2341 }
2342
2343
2344 /*********************************************************************
2345  *
2346  * Function    : receive_and_send_encrypted_post_data
2347  *
2348  * Description : Reads remaining request body from the client and sends
2349  *               it to the server.
2350  *
2351  * Parameters  :
2352  *          1  :  csp = Current client state (buffers, headers, etc...)
2353  *
2354  * Returns     :  0 on success, anything else is an error.
2355  *
2356  *********************************************************************/
2357 static int receive_and_send_encrypted_post_data(struct client_state *csp)
2358 {
2359    int content_length_known = csp->expected_client_content_length != 0;
2360
2361    while (is_ssl_pending(&(csp->ssl_client_attr))
2362       || (content_length_known && csp->expected_client_content_length != 0))
2363    {
2364       unsigned char buf[BUFFER_SIZE];
2365       int len;
2366       int max_bytes_to_read = sizeof(buf);
2367
2368       if (content_length_known && csp->expected_client_content_length < sizeof(buf))
2369       {
2370          max_bytes_to_read = (int)csp->expected_client_content_length;
2371       }
2372       log_error(LOG_LEVEL_CONNECT,
2373          "Waiting for up to %d bytes of request body from the client.",
2374          max_bytes_to_read);
2375       len = ssl_recv_data(&(csp->ssl_client_attr), buf,
2376          (unsigned)max_bytes_to_read);
2377       if (len == -1)
2378       {
2379          return 1;
2380       }
2381       if (len == 0)
2382       {
2383          /* XXX: Does this actually happen? */
2384          break;
2385       }
2386       log_error(LOG_LEVEL_CONNECT, "Forwarding %d bytes of encrypted request body",
2387          len);
2388       len = ssl_send_data(&(csp->ssl_server_attr), buf, (size_t)len);
2389       if (len == -1)
2390       {
2391          return 1;
2392       }
2393       if (csp->expected_client_content_length != 0)
2394       {
2395          if (csp->expected_client_content_length >= len)
2396          {
2397             csp->expected_client_content_length -= (unsigned)len;
2398          }
2399          if (csp->expected_client_content_length == 0)
2400          {
2401             log_error(LOG_LEVEL_CONNECT, "Forwarded the last %d bytes", len);
2402             break;
2403          }
2404       }
2405    }
2406
2407    log_error(LOG_LEVEL_CONNECT, "Done forwarding encrypted request body");
2408
2409    return 0;
2410
2411 }
2412
2413
2414 /*********************************************************************
2415  *
2416  * Function    : send_https_request
2417  *
2418  * Description : Sends the HTTP headers from the client request
2419  *               and all the body data that has already been received.
2420  *
2421  * Parameters  :
2422  *          1  :  csp = Current client state (buffers, headers, etc...)
2423  *
2424  * Returns     :  0 on success, anything else is an error.
2425  *
2426  *********************************************************************/
2427 static int send_https_request(struct client_state *csp)
2428 {
2429    char *hdr;
2430    int ret;
2431    long flushed = 0;
2432    const char *to_send;
2433    size_t to_send_len;
2434    int filter_client_body = csp->expected_client_content_length != 0 &&
2435       client_body_filters_enabled(csp->action) && can_filter_request_body(csp);
2436
2437    if (filter_client_body)
2438    {
2439       if (read_https_request_body(csp))
2440       {
2441          return 1;
2442       }
2443       to_send_len = csp->expected_client_content_length;
2444       to_send = execute_client_body_filters(csp, &to_send_len);
2445       if (to_send == NULL)
2446       {
2447          /* just flush client_iob */
2448          filter_client_body = FALSE;
2449       }
2450       else if (to_send_len != csp->expected_client_content_length &&
2451          update_client_headers(csp, to_send_len))
2452       {
2453          log_error(LOG_LEVEL_HEADER, "Error updating client headers");
2454          return 1;
2455       }
2456       csp->expected_client_content_length = 0;
2457    }
2458
2459    hdr = list_to_text(csp->https_headers);
2460    if (hdr == NULL)
2461    {
2462       /* FIXME Should handle error properly */
2463       log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2464    }
2465    list_remove_all(csp->https_headers);
2466
2467    /*
2468     * Write the client's (modified) header to the server
2469     * (along with anything else that may be in the buffer)
2470     */
2471    ret = ssl_send_data(&(csp->ssl_server_attr),
2472       (const unsigned char *)hdr, strlen(hdr));
2473    freez(hdr);
2474
2475    if (ret < 0)
2476    {
2477       log_error(LOG_LEVEL_CONNECT,
2478          "Failed sending encrypted request headers to: %s: %E",
2479          csp->http->hostport);
2480       mark_server_socket_tainted(csp);
2481       return 1;
2482    }
2483
2484    if (filter_client_body)
2485    {
2486       ret = ssl_send_data(&(csp->ssl_server_attr), (const unsigned char *)to_send, to_send_len);
2487       freez(to_send);
2488       if (ret < 0)
2489       {
2490          log_error(LOG_LEVEL_CONNECT, "Failed sending filtered request body to: %s",
2491             csp->http->hostport);
2492          return 1;
2493       }
2494    }
2495
2496    if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) == 0)
2497       && ((flushed = ssl_flush_socket(&(csp->ssl_server_attr),
2498             csp->client_iob)) < 0))
2499    {
2500       log_error(LOG_LEVEL_CONNECT, "Failed sending request body to: %s: %E",
2501          csp->http->hostport);
2502       return 1;
2503    }
2504    if (flushed != 0 || csp->expected_client_content_length != 0)
2505    {
2506       if (csp->expected_client_content_length != 0)
2507       {
2508          if (csp->expected_client_content_length < flushed)
2509          {
2510             log_error(LOG_LEVEL_ERROR,
2511                "Flushed %ld bytes of request body while only expecting %llu",
2512                flushed, csp->expected_client_content_length);
2513             csp->expected_client_content_length = 0;
2514          }
2515          else
2516          {
2517             log_error(LOG_LEVEL_CONNECT,
2518                "Flushed %ld bytes of request body while expecting %llu",
2519                flushed, csp->expected_client_content_length);
2520             csp->expected_client_content_length -= (unsigned)flushed;
2521             if (receive_and_send_encrypted_post_data(csp))
2522             {
2523                return 1;
2524             }
2525          }
2526       }
2527       else
2528       {
2529          log_error(LOG_LEVEL_CONNECT,
2530             "Flushed %ld bytes of request body", flushed);
2531       }
2532    }
2533
2534    log_error(LOG_LEVEL_CONNECT, "Encrypted request sent");
2535
2536    return 0;
2537
2538 }
2539
2540
2541 /*********************************************************************
2542  *
2543  * Function    :  receive_encrypted_request_headers
2544  *
2545  * Description :  Receives the encrypted request headers when
2546  *                https-inspecting.
2547  *
2548  * Parameters  :
2549  *          1  :  csp = Current client state (buffers, headers, etc...)
2550  *
2551  * Returns     :  JB_ERR_OK on success,
2552  *                JB_ERR_PARSE or JB_ERR_MEMORY otherwise
2553  *
2554  *********************************************************************/
2555 static jb_err receive_encrypted_request_headers(struct client_state *csp)
2556 {
2557    char buf[BUFFER_SIZE];
2558    int len;
2559    char *p;
2560
2561    do
2562    {
2563       log_error(LOG_LEVEL_HEADER, "Waiting for encrypted client headers");
2564       if (!is_ssl_pending(&(csp->ssl_client_attr)) &&
2565           !data_is_available(csp->cfd, csp->config->socket_timeout))
2566       {
2567          log_error(LOG_LEVEL_CONNECT,
2568             "Socket %d timed out while waiting for client headers", csp->cfd);
2569          return JB_ERR_PARSE;
2570       }
2571       len = ssl_recv_data(&(csp->ssl_client_attr),
2572          (unsigned char *)buf, sizeof(buf));
2573       if (len == 0)
2574       {
2575          log_error(LOG_LEVEL_CONNECT,
2576             "Socket %d closed while waiting for client headers", csp->cfd);
2577          return JB_ERR_PARSE;
2578       }
2579       if (len == -1)
2580       {
2581          return JB_ERR_PARSE;
2582       }
2583       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
2584       {
2585          return JB_ERR_MEMORY;
2586       }
2587       p = strstr(csp->client_iob->cur, "\r\n\r\n");
2588    } while (p == NULL);
2589
2590    log_error(LOG_LEVEL_HEADER, "Encrypted headers received completely");
2591
2592    return JB_ERR_OK;
2593 }
2594
2595
2596 /*********************************************************************
2597  *
2598  * Function    :  change_encrypted_request_destination
2599  *
2600  * Description :  Parse a (rewritten) request line from an encrypted
2601  *                request and regenerate the http request data.
2602  *
2603  * Parameters  :
2604  *          1  :  csp = Current client state (buffers, headers, etc...)
2605  *
2606  * Returns     :  Forwards the parse_http_request() return code.
2607  *                Terminates in case of memory problems.
2608  *
2609  *********************************************************************/
2610 static jb_err change_encrypted_request_destination(struct client_state *csp)
2611 {
2612    jb_err err;
2613    char *original_host = csp->http->host;
2614    int original_port = csp->http->port;
2615
2616    log_error(LOG_LEVEL_REDIRECTS, "Rewrite detected: %s",
2617       csp->https_headers->first->str);
2618    csp->http->host = NULL;
2619    free_http_request(csp->http);
2620    err = parse_http_request(csp->https_headers->first->str, csp->http);
2621    if (JB_ERR_OK != err)
2622    {
2623       log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
2624          jb_err_to_string(err));
2625       freez(original_host);
2626       return err;
2627    }
2628
2629    if (csp->http->host == NULL)
2630    {
2631       char port_string[10];
2632       /*
2633        * The rewritten request line did not specify a host
2634        * which means we can use the original host specified
2635        * by the client.
2636        */
2637       csp->http->host = original_host;
2638       csp->http->port = original_port;
2639       log_error(LOG_LEVEL_REDIRECTS, "Keeping the original host: %s",
2640          csp->http->host);
2641       /*
2642        * If the rewritten request line didn't contain a host
2643        * it also didn't contain a port so we can reuse the host
2644        * port.
2645        */
2646       freez(csp->http->hostport);
2647       csp->http->hostport = strdup_or_die(csp->http->host);
2648       snprintf(port_string, sizeof(port_string), ":%d", original_port);
2649       err = string_append(&csp->http->hostport, port_string);
2650       if (err != JB_ERR_OK)
2651       {
2652          log_error(LOG_LEVEL_ERROR, "Failed to rebuild hostport: %s.",
2653             jb_err_to_string(err));
2654          return err;
2655       }
2656
2657       /*
2658        * While the request line didn't mention it,
2659        * we're https-inspecting and want to speak TLS
2660        * with the server.
2661        */
2662       csp->http->server_ssl = 1;
2663       csp->http->ssl = 1;
2664    }
2665    else
2666    {
2667       /* The rewrite filter added a host so we can ditch the original */
2668       freez(original_host);
2669       csp->http->server_ssl = csp->http->ssl;
2670    }
2671
2672    csp->http->client_ssl = 1;
2673
2674    freez(csp->https_headers->first->str);
2675    build_request_line(csp, NULL, &csp->https_headers->first->str);
2676
2677    if (!server_use_ssl(csp))
2678    {
2679       log_error(LOG_LEVEL_REDIRECTS,
2680          "Rewritten request line results in downgrade to http");
2681       /*
2682        * Replace the unencryptd headers received with the
2683        * CONNECT request with the ones we received securely.
2684        */
2685       destroy_list(csp->headers);
2686       csp->headers->first = csp->https_headers->first;
2687       csp->headers->last  = csp->https_headers->last;
2688       csp->https_headers->first = NULL;
2689       csp->https_headers->last = NULL;
2690    }
2691
2692    return JB_ERR_OK;
2693
2694 }
2695
2696
2697 /*********************************************************************
2698  *
2699  * Function    :  process_encrypted_request_headers
2700  *
2701  * Description :  Receives and parses the encrypted headers send
2702  *                by the client when https-inspecting.
2703  *
2704  * Parameters  :
2705  *          1  :  csp = Current client state (buffers, headers, etc...)
2706  *
2707  * Returns     :  JB_ERR_OK on success,
2708  *                JB_ERR_PARSE or JB_ERR_MEMORY otherwise
2709  *
2710  *********************************************************************/
2711 static jb_err process_encrypted_request_headers(struct client_state *csp)
2712 {
2713    char *p;
2714    char *request_line;
2715    jb_err err;
2716    /* Temporary copy of the client's headers before they get enlisted in csp->https_headers */
2717    struct list header_list;
2718    struct list *headers = &header_list;
2719
2720    assert(csp->ssl_with_client_is_opened);
2721
2722 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2723    if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
2724    {
2725       csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2726    }
2727 #endif
2728    err = receive_encrypted_request_headers(csp);
2729    if (err != JB_ERR_OK)
2730    {
2731       if (csp->client_iob->cur == NULL ||
2732           csp->client_iob->cur == csp->client_iob->eod)
2733       {
2734          /*
2735           * We did not receive any data, most likely because the
2736           * client is done. Don't log this as a parse failure.
2737           */
2738          return JB_ERR_PARSE;
2739       }
2740       /* XXX: Also used for JB_ERR_MEMORY */
2741       log_error(LOG_LEVEL_ERROR, "Failed to receive encrypted request: %s",
2742          jb_err_to_string(err));
2743       ssl_send_data_delayed(&(csp->ssl_client_attr),
2744          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2745       return err;
2746    }
2747
2748    /* We don't need get_request_line() because the whole HTTP head is buffered. */
2749    request_line = get_header(csp->client_iob);
2750    if (request_line == NULL)
2751    {
2752       log_error(LOG_LEVEL_ERROR, "Failed to get the encrypted request line");
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    assert(*request_line != '\0');
2758
2759    if (client_protocol_is_unsupported(csp, request_line))
2760    {
2761       /*
2762        * If the protocol is unsupported we're done here.
2763        * client_protocol_is_unsupported() took care of sending
2764        * the error response and logging the error message.
2765        */
2766       return JB_ERR_PARSE;
2767    }
2768
2769 #ifdef FEATURE_FORCE_LOAD
2770    if (force_required(csp, request_line))
2771    {
2772       csp->flags |= CSP_FLAG_FORCED;
2773    }
2774 #endif /* def FEATURE_FORCE_LOAD */
2775
2776    free_http_request(csp->http);
2777
2778    err = parse_http_request(request_line, csp->http);
2779    /* XXX: Restore ssl setting. This is ugly */
2780    csp->http->client_ssl = 1;
2781    csp->http->server_ssl = 1;
2782
2783    freez(request_line);
2784    if (JB_ERR_OK != err)
2785    {
2786       ssl_send_data_delayed(&(csp->ssl_client_attr),
2787          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2788       /* XXX: Use correct size */
2789       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2790       log_error(LOG_LEVEL_ERROR,
2791          "Couldn't parse request line received from %s: %s",
2792          csp->ip_addr_str, jb_err_to_string(err));
2793
2794       free_http_request(csp->http);
2795       return JB_ERR_PARSE;
2796    }
2797
2798    /* Parse the rest of the client's headers. */
2799    init_list(headers);
2800    for (;;)
2801    {
2802       p = get_header(csp->client_iob);
2803
2804       if (p == NULL)
2805       {
2806          /* There are no additional headers to read. */
2807          break;
2808       }
2809       enlist(headers, p);
2810       freez(p);
2811    }
2812
2813    if (JB_ERR_OK != get_destination_from_https_headers(headers, csp->http))
2814    {
2815       /*
2816        * Our attempts to get the request destination
2817        * elsewhere failed.
2818        */
2819       log_error(LOG_LEVEL_ERROR,
2820          "Failed to get the encrypted request destination");
2821       ssl_send_data_delayed(&(csp->ssl_client_attr),
2822          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2823       destroy_list(headers);
2824
2825       return JB_ERR_PARSE;
2826    }
2827
2828    /* Split the domain we just got for pattern matching */
2829    init_domain_components(csp->http);
2830
2831 #ifdef FEATURE_CLIENT_TAGS
2832    /* XXX: If the headers were enlisted sooner, passing csp would do. */
2833    if (csp->client_address == NULL)
2834    {
2835       set_client_address(csp, headers);
2836       get_tag_list_for_client(csp->client_tags, csp->client_address);
2837    }
2838 #endif
2839
2840 #ifdef FEATURE_TOGGLE
2841    if ((csp->flags & CSP_FLAG_TOGGLED_ON) != 0)
2842 #endif
2843    {
2844       /*
2845        * Determine the actions for this request after
2846        * clearing the ones from the previous one.
2847        */
2848       free_current_action(csp->action);
2849       get_url_actions(csp, csp->http);
2850    }
2851
2852    enlist(csp->https_headers, csp->http->cmd);
2853
2854    /* Append the previously read headers */
2855    err = list_append_list_unique(csp->https_headers, headers);
2856    destroy_list(headers);
2857    if (JB_ERR_OK != err)
2858    {
2859       /* XXX: Send error message */
2860       return err;
2861    }
2862
2863    /* XXX: Work around crash */
2864    csp->error_message = NULL;
2865
2866    /* XXX: Why do this here? */
2867    csp->http->ssl = 1;
2868
2869    err = sed_https(csp);
2870    if (JB_ERR_OK != err)
2871    {
2872       ssl_send_data_delayed(&(csp->ssl_client_attr),
2873          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2874       log_error(LOG_LEVEL_ERROR, "Failed to parse client request from %s.",
2875          csp->ip_addr_str);
2876       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
2877          csp->ip_addr_str, csp->http->cmd);
2878       return JB_ERR_PARSE;
2879    }
2880
2881    if ((NULL == csp->https_headers->first->str)
2882       || (strcmp(csp->http->cmd, csp->https_headers->first->str) &&
2883          (JB_ERR_OK != change_encrypted_request_destination(csp))))
2884    {
2885       ssl_send_data_delayed(&(csp->ssl_client_attr),
2886          (const unsigned char *)MESSED_UP_REQUEST_RESPONSE,
2887          strlen(MESSED_UP_REQUEST_RESPONSE), get_write_delay(csp));
2888       log_error(LOG_LEVEL_ERROR,
2889          "Invalid request line after applying header filters.");
2890       /* XXX: Use correct size */
2891       log_error(LOG_LEVEL_CLF,
2892          "%s - - [%T] \"Invalid request generated\" 400 0", csp->ip_addr_str);
2893
2894       return JB_ERR_PARSE;
2895    }
2896
2897    log_error(LOG_LEVEL_HEADER, "Encrypted request headers processed");
2898    log_error(LOG_LEVEL_REQUEST, "https://%s%s", csp->http->hostport,
2899       csp->http->path);
2900
2901    return err;
2902
2903 }
2904
2905 /*********************************************************************
2906  *
2907  * Function    :  cgi_page_requested
2908  *
2909  * Description :  Checks if a request is for an internal CGI page.
2910  *
2911  * Parameters  :
2912  *          1  :  host = The host requested by the client.
2913  *
2914  * Returns     :  1 if a CGI page has been requested, 0 otherwise
2915  *
2916  *********************************************************************/
2917 static int cgi_page_requested(const char *host)
2918 {
2919    if ((0 == strcmpic(host, CGI_SITE_1_HOST))
2920     || (0 == strcmpic(host, CGI_SITE_1_HOST "."))
2921     || (0 == strcmpic(host, CGI_SITE_2_HOST))
2922     || (0 == strcmpic(host, CGI_SITE_2_HOST ".")))
2923    {
2924       return 1;
2925    }
2926
2927    return 0;
2928
2929 }
2930
2931
2932 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2933 /*********************************************************************
2934  *
2935  * Function    :  continue_https_chat
2936  *
2937  * Description :  Behaves similar to chat() but only deals with
2938  *                https-inspected requests that arrive on an already
2939  *                established connection. The first request is always
2940  *                served by chat() which is a lot more complex as it
2941  *                has to deal with forwarding settings and connection
2942  *                failures etc.
2943  *
2944  *                If a connection to the server has already been
2945  *                opened it is reused unless the request is blocked
2946  *                or the forwarder changed.
2947  *
2948  *                If a connection to the server has not yet been
2949  *                opened (because the previous request was crunched),
2950  *                or the forwarder changed, the connection is dropped
2951  *                so that the client retries on a fresh one.
2952  *
2953  * Parameters  :
2954  *          1  :  csp = Current client state (buffers, headers, etc...)
2955  *
2956  * Returns     :  Nothing.
2957  *
2958  *********************************************************************/
2959 static void continue_https_chat(struct client_state *csp)
2960 {
2961    const struct forward_spec *fwd;
2962
2963    if (JB_ERR_OK != process_encrypted_request_headers(csp))
2964    {
2965       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2966       return;
2967    }
2968
2969    csp->requests_received_total++;
2970
2971    /*
2972     * We have an encrypted request. Check if one of the crunchers wants it.
2973     */
2974    if (crunch_response_triggered(csp, crunchers_all))
2975    {
2976       /*
2977        * Yes. The client got the crunch response and we're done here.
2978        */
2979       return;
2980    }
2981    if (csp->ssl_with_server_is_opened == 0)
2982    {
2983       log_error(LOG_LEVEL_CONNECT,
2984          "Dropping the client connection on socket %d. "
2985          "The server connection has not been established yet.",
2986          csp->cfd);
2987       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2988       return;
2989    }
2990    assert(csp->server_connection.sfd != JB_INVALID_SOCKET);
2991
2992    fwd = forward_url(csp, csp->http);
2993    if (!connection_destination_matches(&csp->server_connection, csp->http, fwd))
2994    {
2995       log_error(LOG_LEVEL_CONNECT,
2996          "Dropping the client connection on socket %d with "
2997          "server socket %d connected to %s. The forwarder has changed.",
2998          csp->cfd, csp->server_connection.sfd, csp->server_connection.host);
2999       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
3000       return;
3001    }
3002
3003    log_applied_actions(csp->action);
3004
3005    log_error(LOG_LEVEL_CONNECT,
3006       "Reusing server socket %d connected to %s. Requests already sent: %u.",
3007       csp->server_connection.sfd, csp->server_connection.host,
3008       csp->server_connection.requests_sent_total);
3009
3010    if (send_https_request(csp))
3011    {
3012       /*
3013        * Most likely the server connection timed out. We can't easily
3014        * create a new one so simply drop the client connection without a
3015        * error response to let the client retry.
3016        */
3017       log_error(LOG_LEVEL_CONNECT,
3018          "Dropping client connection on socket %d. "
3019          "Forwarding the encrypted client request failed.",
3020          csp->cfd);
3021       return;
3022    }
3023    csp->server_connection.request_sent = time(NULL);
3024    csp->server_connection.requests_sent_total++;
3025    handle_established_connection(csp);
3026    freez(csp->receive_buffer);
3027 }
3028 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3029 #endif
3030
3031
3032 /*********************************************************************
3033  *
3034  * Function    :  handle_established_connection
3035  *
3036  * Description :  Shuffle data between client and server once the
3037  *                connection has been established and the request
3038  *                has been sent.
3039  *
3040  * Parameters  :
3041  *          1  :  csp = Current client state (buffers, headers, etc...)
3042  *
3043  * Returns     :  Nothing.
3044  *
3045  *********************************************************************/
3046 static void handle_established_connection(struct client_state *csp)
3047 {
3048    char *hdr;
3049    char *p;
3050    int n;
3051 #ifdef HAVE_POLL
3052    struct pollfd poll_fds[2];
3053 #else
3054    fd_set rfds;
3055    jb_socket maxfd;
3056    struct timeval timeout;
3057 #endif
3058    int server_body;
3059    int ms_iis5_hack = 0;
3060    unsigned long long byte_count = 0;
3061    struct http_request *http;
3062    long len = 0; /* for buffer sizes (and negative error codes) */
3063    int buffer_and_filter_content = 0;
3064    unsigned int write_delay;
3065 #ifdef FEATURE_HTTPS_INSPECTION
3066    int ret = 0;
3067    int use_ssl_tunnel = 0;
3068    csp->dont_verify_certificate = 0;
3069
3070    if (csp->http->ssl && !(csp->action->flags & ACTION_HTTPS_INSPECTION))
3071    {
3072       /* Pass encrypted content without filtering. */
3073       use_ssl_tunnel = 1;
3074    }
3075 #endif
3076
3077    /* Skeleton for HTTP response, if we should intercept the request */
3078    struct http_response *rsp;
3079 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3080    int watch_client_socket;
3081 #endif
3082
3083    csp->receive_buffer_size = csp->config->receive_buffer_size;
3084    csp->receive_buffer = zalloc(csp->receive_buffer_size + 1);
3085    if (csp->receive_buffer == NULL)
3086    {
3087       log_error(LOG_LEVEL_ERROR,
3088          "Out of memory. Failed to allocate the receive buffer.");
3089       rsp = cgi_error_memory();
3090       send_crunch_response(csp, rsp);
3091       return;
3092    }
3093
3094    http = csp->http;
3095
3096 #ifndef HAVE_POLL
3097    maxfd = (csp->cfd > csp->server_connection.sfd) ?
3098       csp->cfd : csp->server_connection.sfd;
3099 #endif
3100
3101    /* pass data between the client and server
3102     * until one or the other shuts down the connection.
3103     */
3104
3105    server_body = 0;
3106
3107 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3108    watch_client_socket = 0 == (csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING);
3109 #endif
3110    write_delay = get_write_delay(csp);
3111
3112    for (;;)
3113    {
3114 #ifdef FEATURE_HTTPS_INSPECTION
3115       if (server_use_ssl(csp) && is_ssl_pending(&(csp->ssl_server_attr)))
3116       {
3117          /*
3118           * It's possible that the TLS library already consumed all the
3119           * data the server intends to send. If that happens poll() and
3120           * select() will no longer see the data as available so we have
3121           * to skip the calls.
3122           */
3123          goto server_wants_to_talk;
3124       }
3125       if (watch_client_socket && client_use_ssl(csp) &&
3126          is_ssl_pending(&(csp->ssl_client_attr)))
3127       {
3128          /*
3129           * The TLS libray may also consume all of the remaining data
3130           * from the client when we're shuffling the data from an
3131           * unbuffered request body to the server.
3132           */
3133          goto client_wants_to_talk;
3134       }
3135 #endif
3136 #ifndef HAVE_POLL
3137       FD_ZERO(&rfds);
3138 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3139       if (!watch_client_socket)
3140       {
3141          maxfd = csp->server_connection.sfd;
3142       }
3143       else
3144 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3145       {
3146          FD_SET(csp->cfd, &rfds);
3147       }
3148
3149       FD_SET(csp->server_connection.sfd, &rfds);
3150 #endif /* ndef HAVE_POLL */
3151
3152 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3153       if ((csp->flags & CSP_FLAG_CHUNKED)
3154          && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3155          && ((csp->iob->eod - csp->iob->cur) >= 5)
3156          && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
3157       {
3158          /*
3159           * XXX: This check should be obsolete now,
3160           *      but let's wait a while to be sure.
3161           */
3162          log_error(LOG_LEVEL_CONNECT,
3163             "Looks like we got the last chunk together with "
3164             "the server headers but didn't detect it earlier. "
3165             "We better stop reading.");
3166          byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3167          csp->expected_content_length = byte_count;
3168          csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3169       }
3170       if (server_body && server_response_is_complete(csp, byte_count))
3171       {
3172          if (csp->expected_content_length == byte_count)
3173          {
3174             log_error(LOG_LEVEL_CONNECT,
3175                "Done reading from server. Content length: %llu as expected. "
3176                "Bytes most recently read: %ld.",
3177                byte_count, len);
3178          }
3179          else
3180          {
3181             log_error(LOG_LEVEL_CONNECT,
3182                "Done reading from server. Expected content length: %llu. "
3183                "Actual content length: %llu. Bytes most recently read: %ld.",
3184                csp->expected_content_length, byte_count, len);
3185          }
3186          len = 0;
3187          /*
3188           * XXX: Should not jump around, handle_established_connection()
3189           * is complicated enough already.
3190           */
3191          goto reading_done;
3192       }
3193 #endif  /* FEATURE_CONNECTION_KEEP_ALIVE */
3194
3195 #ifdef HAVE_POLL
3196       poll_fds[0].fd = csp->cfd;
3197 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3198       if (!watch_client_socket)
3199       {
3200          /*
3201           * Ignore incoming data, but still watch out
3202           * for disconnects etc. These flags are always
3203           * implied anyway but explicitly setting them
3204           * doesn't hurt.
3205           */
3206          poll_fds[0].events = POLLERR|POLLHUP;
3207       }
3208       else
3209 #endif
3210       {
3211          poll_fds[0].events = POLLIN;
3212       }
3213       poll_fds[1].fd = csp->server_connection.sfd;
3214       poll_fds[1].events = POLLIN;
3215       n = poll(poll_fds, 2, csp->config->socket_timeout * 1000);
3216 #else
3217       timeout.tv_sec = csp->config->socket_timeout;
3218       timeout.tv_usec = 0;
3219       n = select((int)maxfd + 1, &rfds, NULL, NULL, &timeout);
3220 #endif /* def HAVE_POLL */
3221
3222       /* Server or client not responding in timeout */
3223       if (n == 0)
3224       {
3225          log_error(LOG_LEVEL_CONNECT, "Socket timeout %d reached: %s",
3226             csp->config->socket_timeout, http->url);
3227          if ((byte_count == 0) && (http->ssl == 0))
3228          {
3229             send_crunch_response(csp, error_response(csp, "connection-timeout"));
3230          }
3231          mark_server_socket_tainted(csp);
3232 #ifdef FEATURE_HTTPS_INSPECTION
3233          close_client_and_server_ssl_connections(csp);
3234 #endif
3235          return;
3236       }
3237       else if (n < 0)
3238       {
3239 #ifdef HAVE_POLL
3240          log_error(LOG_LEVEL_ERROR, "poll() failed!: %E");
3241 #else
3242          log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
3243 #endif
3244          mark_server_socket_tainted(csp);
3245 #ifdef FEATURE_HTTPS_INSPECTION
3246          close_client_and_server_ssl_connections(csp);
3247 #endif
3248          return;
3249       }
3250
3251       /*
3252        * This is the body of the browser's request,
3253        * just read and write it.
3254        *
3255        * Receives data from browser and sends it to server
3256        *
3257        * XXX: Make sure the client doesn't use pipelining
3258        * behind Privoxy's back.
3259        */
3260 #ifdef HAVE_POLL
3261       if ((poll_fds[0].revents & (POLLERR|POLLHUP|POLLNVAL)) != 0)
3262       {
3263          log_error(LOG_LEVEL_CONNECT,
3264             "The client socket %d has become unusable while "
3265             "the server socket %d is still open.",
3266             csp->cfd, csp->server_connection.sfd);
3267          mark_server_socket_tainted(csp);
3268          break;
3269       }
3270
3271       if (poll_fds[0].revents != 0)
3272 #else
3273       if (FD_ISSET(csp->cfd, &rfds))
3274 #endif /* def HAVE_POLL*/
3275       {
3276          int max_bytes_to_read;
3277
3278 #ifdef FEATURE_HTTPS_INSPECTION
3279          client_wants_to_talk:
3280 #endif
3281
3282          max_bytes_to_read = (int)csp->receive_buffer_size;
3283
3284 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3285          if ((csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ))
3286          {
3287             if (data_is_available(csp->cfd, 0))
3288             {
3289                /*
3290                 * If the next request is already waiting, we have
3291                 * to stop select()ing the client socket. Otherwise
3292                 * we would always return right away and get nothing
3293                 * else done.
3294                 */
3295                watch_client_socket = 0;
3296                log_error(LOG_LEVEL_CONNECT,
3297                   "Stop watching client socket %d. "
3298                   "There's already another request waiting.",
3299                   csp->cfd);
3300                continue;
3301             }
3302             /*
3303              * If the client socket is set, but there's no data
3304              * available on the socket, the client went fishing
3305              * and continuing talking to the server makes no sense.
3306              */
3307             log_error(LOG_LEVEL_CONNECT,
3308                "The client closed socket %d while "
3309                "the server socket %d is still open.",
3310                csp->cfd, csp->server_connection.sfd);
3311             mark_server_socket_tainted(csp);
3312             break;
3313          }
3314          if (csp->expected_client_content_length != 0)
3315          {
3316             if (csp->expected_client_content_length < csp->receive_buffer_size)
3317             {
3318                max_bytes_to_read = (int)csp->expected_client_content_length;
3319             }
3320             log_error(LOG_LEVEL_CONNECT,
3321                "Waiting for up to %d bytes from the client.",
3322                max_bytes_to_read);
3323          }
3324          assert(max_bytes_to_read <= csp->receive_buffer_size);
3325 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3326
3327 #ifdef FEATURE_HTTPS_INSPECTION
3328          if (client_use_ssl(csp))
3329          {
3330             if (csp->http->status == 101)
3331             {
3332                len = ssl_recv_data(&(csp->ssl_client_attr),
3333                   (unsigned char *)csp->receive_buffer,
3334                   (size_t)max_bytes_to_read);
3335                if (len == -1)
3336                {
3337                   log_error(LOG_LEVEL_ERROR, "Failed to receive data "
3338                      "on client socket %d for an upgraded connection",
3339                      csp->cfd);
3340                   break;
3341                }
3342                if (len == 0)
3343                {
3344                   log_error(LOG_LEVEL_CONNECT, "Done receiving data "
3345                      "on client socket %d for an upgraded connection",
3346                      csp->cfd);
3347                   break;
3348                }
3349                byte_count += (unsigned long long)len;
3350                len = ssl_send_data(&(csp->ssl_server_attr),
3351                   (unsigned char *)csp->receive_buffer, (size_t)len);
3352                if (len == -1)
3353                {
3354                   log_error(LOG_LEVEL_ERROR, "Failed to send data "
3355                      "on server socket %d for an upgraded connection",
3356                      csp->server_connection.sfd);
3357                   break;
3358                }
3359                continue;
3360             }
3361             log_error(LOG_LEVEL_CONNECT, "Breaking with TLS/SSL.");
3362             break;
3363          }
3364          else
3365 #endif /* def FEATURE_HTTPS_INSPECTION */
3366          {
3367             len = read_socket(csp->cfd, csp->receive_buffer, max_bytes_to_read);
3368
3369             if (len <= 0)
3370             {
3371                /* XXX: not sure if this is necessary. */
3372                mark_server_socket_tainted(csp);
3373                break; /* "game over, man" */
3374             }
3375
3376 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3377             if (csp->expected_client_content_length != 0)
3378             {
3379                assert(len <= max_bytes_to_read);
3380                csp->expected_client_content_length -= (unsigned)len;
3381                log_error(LOG_LEVEL_CONNECT,
3382                   "Expected client content length set to %llu "
3383                   "after reading %ld bytes.",
3384                   csp->expected_client_content_length, len);
3385                if (csp->expected_client_content_length == 0)
3386                {
3387                   log_error(LOG_LEVEL_CONNECT,
3388                      "Done reading from the client.");
3389                   csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
3390                }
3391             }
3392 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3393
3394             if (write_socket(csp->server_connection.sfd, csp->receive_buffer, (size_t)len))
3395             {
3396                log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
3397                mark_server_socket_tainted(csp);
3398                return;
3399             }
3400          }
3401          continue;
3402       }
3403
3404       /*
3405        * The server wants to talk. It could be the header or the body.
3406        * If `hdr' is null, then it's the header otherwise it's the body.
3407        * FIXME: Does `hdr' really mean `host'? No.
3408        */
3409 #ifdef HAVE_POLL
3410       if (poll_fds[1].revents != 0)
3411 #else
3412       if (FD_ISSET(csp->server_connection.sfd, &rfds))
3413 #endif /* HAVE_POLL */
3414       {
3415 #ifdef FEATURE_HTTPS_INSPECTION
3416          server_wants_to_talk:
3417 #endif
3418 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3419          /*
3420           * If we are buffering content, we don't want to eat up to
3421           * buffer-limit bytes if the client no longer cares about them.
3422           * If we aren't buffering, however, a dead client socket will be
3423           * noticed pretty much right away anyway, so we can reduce the
3424           * overhead by skipping the check.
3425           */
3426          if (buffer_and_filter_content && !socket_is_still_alive(csp->cfd))
3427          {
3428 #ifdef _WIN32
3429             log_error(LOG_LEVEL_CONNECT,
3430                "The server still wants to talk, but the client may already have hung up on us.");
3431 #else
3432             log_error(LOG_LEVEL_CONNECT,
3433                "The server still wants to talk, but the client hung up on us.");
3434             mark_server_socket_tainted(csp);
3435 #ifdef FEATURE_HTTPS_INSPECTION
3436             close_client_and_server_ssl_connections(csp);
3437 #endif
3438             return;
3439 #endif /* def _WIN32 */
3440          }
3441 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3442
3443 #ifdef FEATURE_HTTPS_INSPECTION
3444          /*
3445           * Reading data from standard or secured connection (HTTP/HTTPS)
3446           */
3447          if (server_use_ssl(csp))
3448          {
3449             len = ssl_recv_data(&(csp->ssl_server_attr),
3450                (unsigned char *)csp->receive_buffer, csp->receive_buffer_size);
3451          }
3452          else
3453 #endif
3454          {
3455             len = read_socket(csp->server_connection.sfd, csp->receive_buffer,
3456                (int)csp->receive_buffer_size);
3457          }
3458
3459          if (len < 0)
3460          {
3461             log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
3462
3463             if ((http->ssl && (csp->fwd == NULL))
3464 #ifdef FEATURE_HTTPS_INSPECTION
3465                && use_ssl_tunnel
3466 #endif
3467                 )
3468             {
3469                /*
3470                 * Just hang up. We already confirmed the client's CONNECT
3471                 * request with status code 200 and unencrypted content is
3472                 * no longer welcome.
3473                 */
3474                log_error(LOG_LEVEL_ERROR,
3475                   "CONNECT already confirmed. Unable to tell the client about the problem.");
3476                return;
3477             }
3478             else if (byte_count)
3479             {
3480                /*
3481                 * Just hang up. We already transmitted the original headers
3482                 * and parts of the original content and therefore missed the
3483                 * chance to send an error message (without risking data corruption).
3484                 *
3485                 * XXX: we could retry with a fancy range request here.
3486                 */
3487                log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
3488                   "Unable to tell the client about the problem.");
3489                mark_server_socket_tainted(csp);
3490 #ifdef FEATURE_HTTPS_INSPECTION
3491                close_client_and_server_ssl_connections(csp);
3492 #endif
3493                return;
3494             }
3495             /*
3496              * XXX: Consider handling the cases above the same.
3497              */
3498             mark_server_socket_tainted(csp);
3499             len = 0;
3500          }
3501
3502 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3503          if (csp->flags & CSP_FLAG_CHUNKED)
3504          {
3505             if ((len >= 5) && !memcmp(csp->receive_buffer+len-5, "0\r\n\r\n", 5))
3506             {
3507                /* XXX: this is a temporary hack */
3508                log_error(LOG_LEVEL_CONNECT,
3509                   "Looks like we reached the end of the last chunk. "
3510                   "We better stop reading.");
3511                csp->expected_content_length = byte_count + (unsigned long long)len;
3512                csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3513             }
3514          }
3515          reading_done:
3516 #endif  /* FEATURE_CONNECTION_KEEP_ALIVE */
3517
3518          /*
3519           * This is guaranteed by allocating with zalloc_or_die()
3520           * and never (intentionally) writing to the last byte.
3521           *
3522           * csp->receive_buffer_size is the size of the part of the
3523           * buffer we intentionally write to, but we actually
3524           * allocated csp->receive_buffer_size+1 bytes so the assertion
3525           * stays within the allocated range.
3526           */
3527          assert(csp->receive_buffer[csp->receive_buffer_size] == '\0');
3528
3529          /*
3530           * Add a trailing zero to let be able to use string operations.
3531           * XXX: do we still need this with filter_popups gone?
3532           */
3533          assert(len <= csp->receive_buffer_size);
3534          csp->receive_buffer[len] = '\0';
3535
3536          /*
3537           * Normally, this would indicate that we've read
3538           * as much as the server has sent us and we can
3539           * close the client connection.  However, Microsoft
3540           * in its wisdom has released IIS/5 with a bug that
3541           * prevents it from sending the trailing \r\n in
3542           * a 302 redirect header (and possibly other headers).
3543           * To work around this if we've haven't parsed
3544           * a full header we'll append a trailing \r\n
3545           * and see if this now generates a valid one.
3546           *
3547           * This hack shouldn't have any impacts.  If we've
3548           * already transmitted the header or if this is a
3549           * SSL connection, then we won't bother with this
3550           * hack.  So we only work on partially received
3551           * headers.  If we append a \r\n and this still
3552           * doesn't generate a valid header, then we won't
3553           * transmit anything to the client.
3554           */
3555          if (len == 0)
3556          {
3557
3558             if (server_body || (http->ssl
3559 #ifdef FEATURE_HTTPS_INSPECTION
3560                   && use_ssl_tunnel
3561 #endif
3562                ))
3563             {
3564                /*
3565                 * If we have been buffering up the document,
3566                 * now is the time to apply content modification
3567                 * and send the result to the client.
3568                 */
3569                if (buffer_and_filter_content)
3570                {
3571                   p = execute_content_filters(csp);
3572                   /*
3573                    * If content filtering fails, use the original
3574                    * buffer and length.
3575                    * (see p != NULL ? p : csp->iob->cur below)
3576                    */
3577                   if (NULL == p)
3578                   {
3579                      csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
3580                   }
3581 #ifdef FEATURE_COMPRESSION
3582                   else if ((csp->flags & CSP_FLAG_CLIENT_SUPPORTS_DEFLATE)
3583                      && (csp->content_length > LOWER_LENGTH_LIMIT_FOR_COMPRESSION))
3584                   {
3585                      char *compressed_content = compress_buffer(p,
3586                         (size_t *)&csp->content_length, csp->config->compression_level);
3587                      if (compressed_content != NULL)
3588                      {
3589                         freez(p);
3590                         p = compressed_content;
3591                         csp->flags |= CSP_FLAG_BUFFERED_CONTENT_DEFLATED;
3592                      }
3593                   }
3594 #endif
3595
3596                   if (JB_ERR_OK != update_server_headers(csp))
3597                   {
3598                      log_error(LOG_LEVEL_FATAL,
3599                         "Failed to update server headers. after filtering.");
3600                   }
3601
3602                   hdr = list_to_text(csp->headers);
3603                   if (hdr == NULL)
3604                   {
3605                      /* FIXME Should handle error properly */
3606                      log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3607                   }
3608
3609 #ifdef FEATURE_HTTPS_INSPECTION
3610                   /*
3611                    * Sending data with standard or secured connection (HTTP/HTTPS)
3612                    */
3613                   if (client_use_ssl(csp))
3614                   {
3615                      if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
3616                               (const unsigned char *)hdr, strlen(hdr),
3617                               get_write_delay(csp)) < 0)
3618                         || (ssl_send_data_delayed(&(csp->ssl_client_attr),
3619                               (const unsigned char *) ((p != NULL) ? p : csp->iob->cur),
3620                               csp->content_length, get_write_delay(csp)) < 0))
3621                      {
3622                         log_error(LOG_LEVEL_ERROR,
3623                            "Failed to send the modified content to the client over TLS");
3624                         freez(hdr);
3625                         freez(p);
3626                         mark_server_socket_tainted(csp);
3627                         close_client_and_server_ssl_connections(csp);
3628                         return;
3629                      }
3630                   }
3631                   else
3632 #endif /* def FEATURE_HTTPS_INSPECTION */
3633                   {
3634                      if (write_socket_delayed(csp->cfd, hdr, strlen(hdr), write_delay)
3635                       || write_socket_delayed(csp->cfd, ((p != NULL) ? p : csp->iob->cur),
3636                          (size_t)csp->content_length, write_delay))
3637                      {
3638                         log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
3639                         freez(hdr);
3640                         freez(p);
3641                         mark_server_socket_tainted(csp);
3642                         return;
3643                      }
3644                   }
3645
3646                   freez(hdr);
3647                   freez(p);
3648                }
3649
3650                break; /* "game over, man" */
3651             }
3652
3653             /*
3654              * This is not the body, so let's pretend the server just sent
3655              * us a blank line.
3656              */
3657             snprintf(csp->receive_buffer, csp->receive_buffer_size, "\r\n");
3658             len = (int)strlen(csp->receive_buffer);
3659
3660             /*
3661              * Now, let the normal header parsing algorithm below do its
3662              * job.  If it fails, we'll exit instead of continuing.
3663              */
3664
3665             ms_iis5_hack = 1;
3666          }
3667
3668          /*
3669           * If we're in the body of the server document, just write it to
3670           * the client, unless we need to buffer the body for later
3671           * content-filtering.
3672           */
3673          if (server_body || (http->ssl
3674 #ifdef FEATURE_HTTPS_INSPECTION
3675                && use_ssl_tunnel
3676 #endif
3677             ))
3678          {
3679             if (buffer_and_filter_content)
3680             {
3681                /*
3682                 * If there is no memory left for buffering the content, or the buffer limit
3683                 * has been reached, switch to non-filtering mode, i.e. make & write the
3684                 * header, flush the iob and buf, and get out of the way.
3685                 */
3686                if (add_to_iob(csp->iob, csp->config->buffer_limit, csp->receive_buffer, len))
3687                {
3688                   size_t hdrlen;
3689                   long flushed;
3690
3691                   log_error(LOG_LEVEL_INFO,
3692                      "Flushing header and buffers. Stepping back from filtering.");
3693
3694                   hdr = list_to_text(csp->headers);
3695                   if (hdr == NULL)
3696                   {
3697                      /*
3698                       * Memory is too tight to even generate the header.
3699                       * Send our static "Out-of-memory" page.
3700                       */
3701                      log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
3702                      rsp = cgi_error_memory();
3703                      send_crunch_response(csp, rsp);
3704                      mark_server_socket_tainted(csp);
3705 #ifdef FEATURE_HTTPS_INSPECTION
3706                      close_client_and_server_ssl_connections(csp);
3707 #endif
3708                      return;
3709                   }
3710                   hdrlen = strlen(hdr);
3711
3712 #ifdef FEATURE_HTTPS_INSPECTION
3713                   /*
3714                    * Sending data with standard or secured connection (HTTP/HTTPS)
3715                    */
3716                   if (client_use_ssl(csp))
3717                   {
3718                      if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
3719                              (const unsigned char *)hdr, hdrlen, get_write_delay(csp)) < 0)
3720                         || ((flushed = ssl_flush_socket(&(csp->ssl_client_attr),
3721                                 csp->iob)) < 0)
3722                         || (ssl_send_data_delayed(&(csp->ssl_client_attr),
3723                               (const unsigned char *)csp->receive_buffer, (size_t)len,
3724                               get_write_delay(csp)) < 0))
3725                      {
3726                         log_error(LOG_LEVEL_CONNECT,
3727                            "Flush header and buffers to client failed");
3728                         freez(hdr);
3729                         mark_server_socket_tainted(csp);
3730                         close_client_and_server_ssl_connections(csp);
3731                         return;
3732                      }
3733                   }
3734                   else
3735 #endif /* def FEATURE_HTTPS_INSPECTION */
3736                   {
3737                      if (write_socket_delayed(csp->cfd, hdr, hdrlen, write_delay)
3738                       || ((flushed = flush_iob(csp->cfd, csp->iob, write_delay)) < 0)
3739                       || write_socket_delayed(csp->cfd, csp->receive_buffer, (size_t)len,
3740                             write_delay))
3741                      {
3742                         log_error(LOG_LEVEL_CONNECT,
3743                            "Flush header and buffers to client failed: %E");
3744                         freez(hdr);
3745                         mark_server_socket_tainted(csp);
3746                         return;
3747                      }
3748                   }
3749
3750                   /*
3751                    * Reset the byte_count to the amount of bytes
3752                    * we just flushed. len will be added a few lines below,
3753                    * hdrlen doesn't matter for LOG_LEVEL_CLF.
3754                    */
3755                   byte_count = (unsigned long long)flushed;
3756                   freez(hdr);
3757                   buffer_and_filter_content = 0;
3758                   server_body = 1;
3759                }
3760             }
3761             else
3762             {
3763 #ifdef FEATURE_HTTPS_INSPECTION
3764                /*
3765                 * Sending data with standard or secured connection (HTTP/HTTPS)
3766                 */
3767                if (client_use_ssl(csp))
3768                {
3769                   ret = ssl_send_data_delayed(&(csp->ssl_client_attr),
3770                      (const unsigned char *)csp->receive_buffer, (size_t)len,
3771                      get_write_delay(csp));
3772                   if (ret < 0)
3773                   {
3774                      log_error(LOG_LEVEL_ERROR,
3775                         "Sending data to client failed");
3776                      mark_server_socket_tainted(csp);
3777                      close_client_and_server_ssl_connections(csp);
3778                      return;
3779                   }
3780                }
3781                else
3782 #endif /* def FEATURE_HTTPS_INSPECTION */
3783                {
3784                   if (write_socket_delayed(csp->cfd, csp->receive_buffer,
3785                         (size_t)len, write_delay))
3786                   {
3787                      log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
3788                      mark_server_socket_tainted(csp);
3789                      return;
3790                   }
3791                }
3792             }
3793             byte_count += (unsigned long long)len;
3794             continue;
3795          }
3796          else
3797          {
3798             /*
3799              * We're still looking for the end of the server's header.
3800              * Buffer up the data we just read.  If that fails, there's
3801              * little we can do but send our static out-of-memory page.
3802              */
3803             if (add_to_iob(csp->iob, csp->config->buffer_limit, csp->receive_buffer, len))
3804             {
3805                log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
3806                rsp = cgi_error_memory();
3807                send_crunch_response(csp, rsp);
3808                mark_server_socket_tainted(csp);
3809 #ifdef FEATURE_HTTPS_INSPECTION
3810                close_client_and_server_ssl_connections(csp);
3811 #endif
3812                return;
3813             }
3814
3815             /* Convert iob into something sed() can digest */
3816             if (JB_ERR_PARSE == get_server_headers(csp))
3817             {
3818                if (ms_iis5_hack)
3819                {
3820                   /*
3821                    * Well, we tried our MS IIS/5 hack and it didn't work.
3822                    * The header is incomplete and there isn't anything
3823                    * we can do about it.
3824                    */
3825                   log_error(LOG_LEVEL_ERROR, "Invalid server headers. "
3826                      "Applying the MS IIS5 hack didn't help.");
3827                   log_error(LOG_LEVEL_CLF,
3828                      "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3829 #ifdef FEATURE_HTTPS_INSPECTION
3830                   /*