X-Git-Url: http://www.privoxy.org/gitweb/?p=privoxy.git;a=blobdiff_plain;f=jcc.c;h=fa88995d10d49338ea1d021c050a143d99ed95ca;hp=53de19a607b4ca16450e2307b83f9877edbbef18;hb=c37e4fad3121a5dc86892eb35f19e92c83e05764;hpb=1419e9ec40a3fe80e2c9685f37a081b031db7cf1 diff --git a/jcc.c b/jcc.c index 53de19a6..fa88995d 100644 --- a/jcc.c +++ b/jcc.c @@ -1,4 +1,4 @@ -const char jcc_rcs[] = "$Id: jcc.c,v 1.421 2012/12/07 12:50:37 fabiankeil Exp $"; +const char jcc_rcs[] = "$Id: jcc.c,v 1.450 2016/12/24 16:01:32 fabiankeil Exp $"; /********************************************************************* * * File : $Source: /cvsroot/ijbswa/current/jcc.c,v $ @@ -6,7 +6,7 @@ const char jcc_rcs[] = "$Id: jcc.c,v 1.421 2012/12/07 12:50:37 fabiankeil Exp $" * Purpose : Main file. Contains main() method, main loop, and * the main connection-handling function. * - * Copyright : Written by and Copyright (C) 2001-2012 the + * Copyright : Written by and Copyright (C) 2001-2016 the * Privoxy team. http://www.privoxy.org/ * * Based on the Internet Junkbuster originally written @@ -50,6 +50,7 @@ const char jcc_rcs[] = "$Id: jcc.c,v 1.421 2012/12/07 12:50:37 fabiankeil Exp $" # ifndef STRICT # define STRICT # endif +# include # include # include # endif /* ndef FEATURE_PTHREAD */ @@ -115,6 +116,9 @@ const char jcc_rcs[] = "$Id: jcc.c,v 1.421 2012/12/07 12:50:37 fabiankeil Exp $" #include "cgi.h" #include "loadcfg.h" #include "urlmatch.h" +#ifdef FEATURE_CLIENT_TAGS +#include "client-tags.h" +#endif const char jcc_h_rcs[] = JCC_H_VERSION; const char project_h_rcs[] = PROJECT_H_VERSION; @@ -174,6 +178,11 @@ static int32 server_thread(void *data); #define sleep(N) DosSleep(((N) * 100)) #endif +#ifdef FUZZ +int process_fuzzed_input(char *fuzz_input_type, char *fuzz_input_file); +void show_fuzz_usage(const char *name); +#endif + #ifdef MUTEX_LOCKS_AVAILABLE /* * XXX: Does the locking stuff really belong in this file? @@ -182,6 +191,13 @@ privoxy_mutex_t log_mutex; privoxy_mutex_t log_init_mutex; privoxy_mutex_t connection_reuse_mutex; +#ifdef FEATURE_EXTERNAL_FILTERS +privoxy_mutex_t external_filter_mutex; +#endif +#ifdef FEATURE_CLIENT_TAGS +privoxy_mutex_t client_tags_mutex; +#endif + #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) privoxy_mutex_t resolver_mutex; #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */ @@ -208,12 +224,10 @@ static int received_hup_signal = 0; /* HTTP snipplets. */ static const char CSUCCEED[] = - "HTTP/1.1 200 Connection established\r\n" - "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n"; + "HTTP/1.1 200 Connection established\r\n\r\n"; static const char CHEADER[] = "HTTP/1.1 400 Invalid header received from client\r\n" - "Proxy-Agent: Privoxy " VERSION "\r\n" "Content-Type: text/plain\r\n" "Connection: close\r\n\r\n" "Invalid header received from client.\r\n"; @@ -233,7 +247,6 @@ static const char GOPHER_RESPONSE[] = /* XXX: should be a template */ static const char MISSING_DESTINATION_RESPONSE[] = "HTTP/1.1 400 Bad request received from client\r\n" - "Proxy-Agent: Privoxy " VERSION "\r\n" "Content-Type: text/plain\r\n" "Connection: close\r\n\r\n" "Bad request. Privoxy was unable to extract the destination.\r\n"; @@ -241,7 +254,6 @@ static const char MISSING_DESTINATION_RESPONSE[] = /* XXX: should be a template */ static const char INVALID_SERVER_HEADERS_RESPONSE[] = "HTTP/1.1 502 Server or forwarder response invalid\r\n" - "Proxy-Agent: Privoxy " VERSION "\r\n" "Content-Type: text/plain\r\n" "Connection: close\r\n\r\n" "Bad response. The server or forwarder response doesn't look like HTTP.\r\n"; @@ -249,32 +261,34 @@ static const char INVALID_SERVER_HEADERS_RESPONSE[] = /* XXX: should be a template */ static const char MESSED_UP_REQUEST_RESPONSE[] = "HTTP/1.1 400 Malformed request after rewriting\r\n" - "Proxy-Agent: Privoxy " VERSION "\r\n" "Content-Type: text/plain\r\n" "Connection: close\r\n\r\n" "Bad request. Messed up with header filters.\r\n"; static const char TOO_MANY_CONNECTIONS_RESPONSE[] = "HTTP/1.1 503 Too many open connections\r\n" - "Proxy-Agent: Privoxy " VERSION "\r\n" "Content-Type: text/plain\r\n" "Connection: close\r\n\r\n" "Maximum number of open connections reached.\r\n"; static const char CLIENT_CONNECTION_TIMEOUT_RESPONSE[] = "HTTP/1.1 504 Connection timeout\r\n" - "Proxy-Agent: Privoxy " VERSION "\r\n" "Content-Type: text/plain\r\n" "Connection: close\r\n\r\n" "The connection timed out because the client request didn't arrive in time.\r\n"; static const char CLIENT_BODY_PARSE_ERROR_RESPONSE[] = "HTTP/1.1 400 Failed reading client body\r\n" - "Proxy-Agent: Privoxy " VERSION "\r\n" "Content-Type: text/plain\r\n" "Connection: close\r\n\r\n" "Failed parsing or buffering the chunk-encoded client body.\r\n"; +static const char UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE[] = + "HTTP/1.1 417 Expecting too much\r\n" + "Content-Type: text/plain\r\n" + "Connection: close\r\n\r\n" + "Privoxy detected an unsupported Expect header value.\r\n"; + /* A function to crunch a response */ typedef struct http_response *(*crunch_func_ptr)(struct client_state *); @@ -433,6 +447,40 @@ static int client_protocol_is_unsupported(const struct client_state *csp, char * } +/********************************************************************* + * + * Function : client_has_unsupported_expectations + * + * Description : Checks if the client used an unsupported expectation + * in which case an error message is delivered. + * + * Parameters : + * 1 : csp = Current client state (buffers, headers, etc...) + * + * Returns : TRUE if an error response has been generated, or + * FALSE if the request doesn't look invalid. + * + *********************************************************************/ +static int client_has_unsupported_expectations(const struct client_state *csp) +{ + if ((csp->flags & CSP_FLAG_UNSUPPORTED_CLIENT_EXPECTATION)) + { + log_error(LOG_LEVEL_ERROR, + "Rejecting request from client %s with unsupported Expect header value", + csp->ip_addr_str); + log_error(LOG_LEVEL_CLF, + "%s - - [%T] \"%s\" 417 0", csp->ip_addr_str, csp->http->cmd); + write_socket(csp->cfd, UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE, + strlen(UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE)); + + return TRUE; + } + + return FALSE; + +} + + /********************************************************************* * * Function : get_request_destination_elsewhere @@ -873,7 +921,7 @@ static void build_request_line(struct client_state *csp, const struct forward_sp *request_line = strdup(http->gpc); string_append(request_line, " "); - if (fwd->forward_host) + if (fwd->forward_host && fwd->type != FORWARD_WEBSERVER) { string_append(request_line, http->url); } @@ -920,11 +968,6 @@ static jb_err change_request_destination(struct client_state *csp) log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.", jb_err_to_string(err)); } - else - { - /* XXX: ocmd is a misleading name */ - http->ocmd = strdup_or_die(http->cmd); - } return err; } @@ -1241,7 +1284,12 @@ static char *get_request_line(struct client_state *csp) do { - if (!data_is_available(csp->cfd, csp->config->socket_timeout)) + if ( +#ifdef FUZZ + 0 == (csp->flags & CSP_FLAG_FUZZED_INPUT) && +#endif + !data_is_available(csp->cfd, csp->config->socket_timeout) + ) { if (socket_is_still_alive(csp->cfd)) { @@ -1293,7 +1341,7 @@ enum chunk_status * * Function : chunked_body_is_complete * - * Description : Figures out wheter or not a chunked body is complete. + * Description : Figures out whether or not a chunked body is complete. * * Currently it always starts at the beginning of the * buffer which is somewhat wasteful and prevents Privoxy @@ -1348,12 +1396,15 @@ static enum chunk_status chunked_body_is_complete(struct iob *iob, size_t *lengt { return CHUNK_STATUS_PARSE_ERROR; } - /* - * Skip "\r\n", the chunk data and another "\r\n". - * Moving p to either the beginning of the next chunk-size - * or one byte beyond the end of the chunked data. - */ - p += 2 + chunksize + 2; + /* Move beyond the chunkdata. */ + p += 2 + chunksize; + + /* There should be another "\r\n" to skip */ + if (memcmp(p, "\r\n", 2)) + { + return CHUNK_STATUS_PARSE_ERROR; + } + p += 2; } while (chunksize > 0U); *length = (size_t)(p - iob->cur); @@ -1422,6 +1473,144 @@ static jb_err receive_chunked_client_request_body(struct client_state *csp) } + +#ifdef FUZZ +/********************************************************************* + * + * Function : fuzz_chunked_transfer_encoding + * + * Description : Treat the fuzzed input as chunked transfer encoding + * to check and dechunk. + * + * Parameters : + * 1 : csp = Used to store the data. + * 2 : fuzz_input_file = File to read the input from. + * + * Returns : Result of dechunking + * + *********************************************************************/ +extern int fuzz_chunked_transfer_encoding(struct client_state *csp, char *fuzz_input_file) +{ + size_t length; + size_t size = (size_t)(csp->iob->eod - csp->iob->cur); + enum chunk_status status; + + status = chunked_body_is_complete(csp->iob, &length); + if (CHUNK_STATUS_BODY_COMPLETE != status) + { + log_error(LOG_LEVEL_INFO, "Chunked body is incomplete or invalid"); + } + + return (JB_ERR_OK == remove_chunked_transfer_coding(csp->iob->cur, &size)); + +} + + +/********************************************************************* + * + * Function : fuzz_client_request + * + * Description : Try to get a client request from the fuzzed input. + * + * Parameters : + * 1 : csp = Current client state (buffers, headers, etc...) + * 2 : fuzz_input_file = File to read the input from. + * + * Returns : Result of fuzzing. + * + *********************************************************************/ +extern int fuzz_client_request(struct client_state *csp, char *fuzz_input_file) +{ + jb_err err; + + csp->cfd = 0; + csp->ip_addr_str = "fuzzer"; + + if (strcmp(fuzz_input_file, "-") != 0) + { + log_error(LOG_LEVEL_FATAL, + "Fuzzed client requests can currenty only be read from stdin (-)."); + } + err = receive_client_request(csp); + if (err != JB_ERR_OK) + { + return 1; + } + err = parse_client_request(csp); + if (err != JB_ERR_OK) + { + return 1; + } + + return 0; + +} +#endif /* def FUZZ */ + + +#ifdef FEATURE_FORCE_LOAD +/********************************************************************* + * + * Function : force_required + * + * Description : Checks a request line to see if it contains + * the FORCE_PREFIX. If it does, it is removed + * unless enforcing requests has beend disabled. + * + * Parameters : + * 1 : request_line = HTTP request line + * + * Returns : TRUE if force is required, FALSE otherwise. + * + *********************************************************************/ +static int force_required(const struct client_state *csp, char *request_line) +{ + char *p; + + p = strstr(request_line, "http://"); + if (p != NULL) + { + /* Skip protocol */ + p += strlen("http://"); + } + else + { + /* Intercepted request usually don't specify the protocol. */ + p = request_line; + } + + /* Go to the beginning of the path */ + p = strstr(p, "/"); + if (p == NULL) + { + /* + * If the path is missing the request line is invalid and we + * are done here. The client-visible rejection happens later on. + */ + return 0; + } + + if (0 == strncmpic(p, FORCE_PREFIX, strlen(FORCE_PREFIX) - 1)) + { + if (!(csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)) + { + /* XXX: Should clean more carefully */ + strclean(request_line, FORCE_PREFIX); + log_error(LOG_LEVEL_FORCE, + "Enforcing request: \"%s\".", request_line); + + return 1; + } + log_error(LOG_LEVEL_FORCE, + "Ignored force prefix in request: \"%s\".", request_line); + } + + return 0; + +} +#endif /* def FEATURE_FORCE_LOAD */ + + /********************************************************************* * * Function : receive_client_request @@ -1469,23 +1658,9 @@ static jb_err receive_client_request(struct client_state *csp) } #ifdef FEATURE_FORCE_LOAD - /* - * If this request contains the FORCE_PREFIX and blocks - * aren't enforced, get rid of it and set the force flag. - */ - if (strstr(req, FORCE_PREFIX)) + if (force_required(csp, req)) { - if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS) - { - log_error(LOG_LEVEL_FORCE, - "Ignored force prefix in request: \"%s\".", req); - } - else - { - strclean(req, FORCE_PREFIX); - log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req); - csp->flags |= CSP_FLAG_FORCED; - } + csp->flags |= CSP_FLAG_FORCED; } #endif /* def FEATURE_FORCE_LOAD */ @@ -1588,6 +1763,12 @@ static jb_err receive_client_request(struct client_state *csp) } } +#ifdef FEATURE_CLIENT_TAGS + /* XXX: If the headers were enlisted sooner, passing csp would do. */ + set_client_address(csp, headers); + get_tag_list_for_client(csp->client_tags, csp->client_address); +#endif + /* * Determine the actions for this URL */ @@ -1603,17 +1784,13 @@ static jb_err receive_client_request(struct client_state *csp) get_url_actions(csp, http); } - /* - * Save a copy of the original request for logging - */ - http->ocmd = strdup_or_die(http->cmd); enlist(csp->headers, http->cmd); /* Append the previously read headers */ - list_append_list_unique(csp->headers, headers); + err = list_append_list_unique(csp->headers, headers); destroy_list(headers); - return JB_ERR_OK; + return err; } @@ -1673,9 +1850,12 @@ static jb_err parse_client_request(struct client_state *csp) err = sed(csp, FILTER_CLIENT_HEADERS); if (JB_ERR_OK != err) { - /* XXX: Should be handled in sed(). */ - assert(err == JB_ERR_PARSE); - log_error(LOG_LEVEL_FATAL, "Failed to parse client headers."); + log_error(LOG_LEVEL_ERROR, "Failed to parse client request from %s.", + csp->ip_addr_str); + log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0", + csp->ip_addr_str, csp->http->cmd); + write_socket(csp->cfd, CHEADER, strlen(CHEADER)); + return JB_ERR_PARSE; } csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE; @@ -1698,6 +1878,11 @@ static jb_err parse_client_request(struct client_state *csp) return JB_ERR_PARSE; } + if (client_has_unsupported_expectations(csp)) + { + return JB_ERR_PARSE; + } + return JB_ERR_OK; } @@ -1705,21 +1890,61 @@ static jb_err parse_client_request(struct client_state *csp) /********************************************************************* * - * Function : chat + * Function : send_http_request * - * Description : Once a connection from the client has been accepted, - * this function is called (via serve()) to handle the - * main business of the communication. This function - * returns after dealing with a single request. It can - * be called multiple times with the same client socket - * if the client is keeping the connection alive. + * Description : Sends the HTTP headers from the client request + * and all the body data that has already been received. * - * The decision whether or not a client connection will - * be kept alive is up to the caller which also must - * close the client socket when done. + * Parameters : + * 1 : csp = Current client state (buffers, headers, etc...) * - * FIXME: chat is nearly thousand lines long. - * Ridiculous. + * Returns : 0 on success, anything else is na error. + * + *********************************************************************/ +static int send_http_request(struct client_state *csp) +{ + char *hdr; + int write_failure; + + hdr = list_to_text(csp->headers); + if (hdr == NULL) + { + /* FIXME Should handle error properly */ + log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header"); + } + list_remove_all(csp->headers); + + /* + * Write the client's (modified) header to the server + * (along with anything else that may be in the buffer) + */ + write_failure = 0 != write_socket(csp->server_connection.sfd, hdr, strlen(hdr)); + freez(hdr); + + if (write_failure) + { + log_error(LOG_LEVEL_CONNECT, "Failed sending request headers to: %s: %E", + csp->http->hostport); + } + else if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) == 0) + && (flush_socket(csp->server_connection.sfd, csp->client_iob) < 0)) + { + write_failure = 1; + log_error(LOG_LEVEL_CONNECT, "Failed sending request body to: %s: %E", + csp->http->hostport); + } + + return write_failure; + +} + + +/********************************************************************* + * + * Function : handle_established_connection + * + * Description : Shuffle data between client and server once the + * connection has been established. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) @@ -1727,7 +1952,8 @@ static jb_err parse_client_request(struct client_state *csp) * Returns : Nothing. * *********************************************************************/ -static void chat(struct client_state *csp) +static void handle_established_connection(struct client_state *csp, + const struct forward_spec *fwd) { char buf[BUFFER_SIZE]; char *hdr; @@ -1738,7 +1964,6 @@ static void chat(struct client_state *csp) int server_body; int ms_iis5_hack = 0; unsigned long long byte_count = 0; - const struct forward_spec *fwd; struct http_request *http; long len = 0; /* for buffer sizes (and negative error codes) */ int buffer_and_filter_content = 0; @@ -1754,247 +1979,14 @@ static void chat(struct client_state *csp) http = csp->http; - if (receive_client_request(csp) != JB_ERR_OK) - { - return; - } - if (parse_client_request(csp) != JB_ERR_OK) - { - return; - } - - /* decide how to route the HTTP request */ - fwd = forward_url(csp, http); - if (NULL == fwd) - { - log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!"); - /* Never get here - LOG_LEVEL_FATAL causes program exit */ - return; - } + maxfd = (csp->cfd > csp->server_connection.sfd) ? + csp->cfd : csp->server_connection.sfd; - /* - * build the http request to send to the server - * we have to do one of the following: - * - * create = use the original HTTP request to create a new - * HTTP request that has either the path component - * without the http://domainspec (w/path) or the - * full orininal URL (w/url) - * Note that the path and/or the HTTP version may - * have been altered by now. - * - * connect = Open a socket to the host:port of the server - * and short-circuit server and client socket. - * - * pass = Pass the request unchanged if forwarding a CONNECT - * request to a parent proxy. Note that we'll be sending - * the CFAIL message ourselves if connecting to the parent - * fails, but we won't send a CSUCCEED message if it works, - * since that would result in a double message (ours and the - * parent's). After sending the request to the parent, we simply - * tunnel. - * - * here's the matrix: - * SSL - * 0 1 - * +--------+--------+ - * | | | - * 0 | create | connect| - * | w/path | | - * Forwarding +--------+--------+ - * | | | - * 1 | create | pass | - * | w/url | | - * +--------+--------+ - * + /* pass data between the client and server + * until one or the other shuts down the connection. */ - if (http->ssl && connect_port_is_forbidden(csp)) - { - const char *acceptable_connect_ports = - csp->action->string[ACTION_STRING_LIMIT_CONNECT]; - assert(NULL != acceptable_connect_ports); - log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. " - "limit-connect{%s} doesn't allow CONNECT requests to %s", - csp->ip_addr_str, acceptable_connect_ports, csp->http->hostport); - csp->action->flags |= ACTION_BLOCK; - http->ssl = 0; - } - - if (http->ssl == 0) - { - freez(csp->headers->first->str); - build_request_line(csp, fwd, &csp->headers->first->str); - } - - /* - * We have a request. Check if one of the crunchers wants it. - */ - if (crunch_response_triggered(csp, crunchers_all)) - { - /* - * Yes. The client got the crunch response and we're done here. - */ - return; - } - - log_applied_actions(csp->action); - log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path); - - if (fwd->forward_host) - { - log_error(LOG_LEVEL_CONNECT, "via [%s]:%d to: %s", - fwd->forward_host, fwd->forward_port, http->hostport); - } - else - { - log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport); - } - - /* here we connect to the server, gateway, or the forwarder */ - -#ifdef FEATURE_CONNECTION_KEEP_ALIVE - if ((csp->server_connection.sfd != JB_INVALID_SOCKET) - && socket_is_still_alive(csp->server_connection.sfd) - && connection_destination_matches(&csp->server_connection, http, fwd)) - { - log_error(LOG_LEVEL_CONNECT, - "Reusing server socket %d connected to %s. Total requests: %u.", - csp->server_connection.sfd, csp->server_connection.host, - csp->server_connection.requests_sent_total); - } - else - { - if (csp->server_connection.sfd != JB_INVALID_SOCKET) - { -#ifdef FEATURE_CONNECTION_SHARING - if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING) - { - remember_connection(&csp->server_connection); - } - else -#endif /* def FEATURE_CONNECTION_SHARING */ - { - log_error(LOG_LEVEL_CONNECT, - "Closing server socket %d connected to %s. Total requests: %u.", - csp->server_connection.sfd, csp->server_connection.host, - csp->server_connection.requests_sent_total); - close_socket(csp->server_connection.sfd); - } - mark_connection_closed(&csp->server_connection); - } -#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */ - - csp->server_connection.sfd = forwarded_connect(fwd, http, csp); - - if (csp->server_connection.sfd == JB_INVALID_SOCKET) - { - if (fwd->type != SOCKS_NONE) - { - /* Socks error. */ - rsp = error_response(csp, "forwarding-failed"); - } - else if (errno == EINVAL) - { - rsp = error_response(csp, "no-such-domain"); - } - else - { - rsp = error_response(csp, "connect-failed"); - } - - /* Write the answer to the client */ - if (rsp != NULL) - { - send_crunch_response(csp, rsp); - } - - return; - } -#ifdef FEATURE_CONNECTION_KEEP_ALIVE - save_connection_destination(csp->server_connection.sfd, - http, fwd, &csp->server_connection); - csp->server_connection.keep_alive_timeout = - (unsigned)csp->config->keep_alive_timeout; - } -#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */ - - csp->server_connection.requests_sent_total++; - - if ((fwd->type == SOCKS_5T) && (NULL == csp->headers->first)) - { - /* Client headers have been sent optimistically */ - assert(csp->headers->last == NULL); - } - else if (fwd->forward_host || (http->ssl == 0)) - { - int write_failure; - hdr = list_to_text(csp->headers); - if (hdr == NULL) - { - /* FIXME Should handle error properly */ - log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header"); - } - list_remove_all(csp->headers); - - /* - * Write the client's (modified) header to the server - * (along with anything else that may be in the buffer) - */ - write_failure = 0 != write_socket(csp->server_connection.sfd, hdr, strlen(hdr)); - freez(hdr); - - if (write_failure) - { - log_error(LOG_LEVEL_CONNECT, - "Failed sending request headers to: %s: %E", http->hostport); - } - else if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) == 0) - && (flush_socket(csp->server_connection.sfd, csp->client_iob) < 0)) - { - write_failure = 1; - log_error(LOG_LEVEL_CONNECT, - "Failed sending request body to: %s: %E", http->hostport); - } - - if (write_failure) - { - rsp = error_response(csp, "connect-failed"); - if (rsp) - { - send_crunch_response(csp, rsp); - } - return; - } - } - else - { - /* - * We're running an SSL tunnel and we're not forwarding, - * so just ditch the client headers, send the "connect succeeded" - * message to the client, flush the rest, and get out of the way. - */ - list_remove_all(csp->headers); - if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED))) - { - return; - } - clear_iob(csp->client_iob); - } - - log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport); - - /* XXX: should the time start earlier for optimistically sent data? */ - csp->server_connection.request_sent = time(NULL); - - maxfd = (csp->cfd > csp->server_connection.sfd) ? - csp->cfd : csp->server_connection.sfd; - - /* pass data between the client and server - * until one or the other shuts down the connection. - */ - - server_body = 0; + server_body = 0; #ifdef FEATURE_CONNECTION_KEEP_ALIVE watch_client_socket = 0 == (csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING); @@ -2553,7 +2545,13 @@ static void chat(struct client_state *csp) */ if (JB_ERR_OK != sed(csp, FILTER_SERVER_HEADERS)) { - log_error(LOG_LEVEL_FATAL, "Failed to parse server headers."); + log_error(LOG_LEVEL_CLF, + "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd); + write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE, + strlen(INVALID_SERVER_HEADERS_RESPONSE)); + free_http_request(http); + mark_server_socket_tainted(csp); + return; } hdr = list_to_text(csp->headers); if (hdr == NULL) @@ -2677,6 +2675,325 @@ static void chat(struct client_state *csp) } +/********************************************************************* + * + * Function : chat + * + * Description : Once a connection from the client has been accepted, + * this function is called (via serve()) to handle the + * main business of the communication. This function + * returns after dealing with a single request. It can + * be called multiple times with the same client socket + * if the client is keeping the connection alive. + * + * The decision whether or not a client connection will + * be kept alive is up to the caller which also must + * close the client socket when done. + * + * FIXME: chat is nearly thousand lines long. + * Ridiculous. + * + * Parameters : + * 1 : csp = Current client state (buffers, headers, etc...) + * + * Returns : Nothing. + * + *********************************************************************/ +static void chat(struct client_state *csp) +{ + char buf[BUFFER_SIZE]; + const struct forward_spec *fwd; + struct http_request *http; + /* Skeleton for HTTP response, if we should intercept the request */ + struct http_response *rsp; + + memset(buf, 0, sizeof(buf)); + + http = csp->http; + + if (receive_client_request(csp) != JB_ERR_OK) + { + return; + } + if (parse_client_request(csp) != JB_ERR_OK) + { + return; + } + + /* decide how to route the HTTP request */ + fwd = forward_url(csp, http); + if (NULL == fwd) + { + log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!"); + /* Never get here - LOG_LEVEL_FATAL causes program exit */ + return; + } + + /* + * build the http request to send to the server + * we have to do one of the following: + * + * create = use the original HTTP request to create a new + * HTTP request that has either the path component + * without the http://domainspec (w/path) or the + * full orininal URL (w/url) + * Note that the path and/or the HTTP version may + * have been altered by now. + * + * connect = Open a socket to the host:port of the server + * and short-circuit server and client socket. + * + * pass = Pass the request unchanged if forwarding a CONNECT + * request to a parent proxy. Note that we'll be sending + * the CFAIL message ourselves if connecting to the parent + * fails, but we won't send a CSUCCEED message if it works, + * since that would result in a double message (ours and the + * parent's). After sending the request to the parent, we simply + * tunnel. + * + * here's the matrix: + * SSL + * 0 1 + * +--------+--------+ + * | | | + * 0 | create | connect| + * | w/path | | + * Forwarding +--------+--------+ + * | | | + * 1 | create | pass | + * | w/url | | + * +--------+--------+ + * + */ + + if (http->ssl && connect_port_is_forbidden(csp)) + { + const char *acceptable_connect_ports = + csp->action->string[ACTION_STRING_LIMIT_CONNECT]; + assert(NULL != acceptable_connect_ports); + log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. " + "limit-connect{%s} doesn't allow CONNECT requests to %s", + csp->ip_addr_str, acceptable_connect_ports, csp->http->hostport); + csp->action->flags |= ACTION_BLOCK; + http->ssl = 0; + } + + if (http->ssl == 0) + { + freez(csp->headers->first->str); + build_request_line(csp, fwd, &csp->headers->first->str); + } + + /* + * We have a request. Check if one of the crunchers wants it. + */ + if (crunch_response_triggered(csp, crunchers_all)) + { + /* + * Yes. The client got the crunch response and we're done here. + */ + return; + } + + log_applied_actions(csp->action); + log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path); + + if (fwd->forward_host) + { + log_error(LOG_LEVEL_CONNECT, "via [%s]:%d to: %s", + fwd->forward_host, fwd->forward_port, http->hostport); + } + else + { + log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport); + } + + /* here we connect to the server, gateway, or the forwarder */ + +#ifdef FEATURE_CONNECTION_KEEP_ALIVE + if ((csp->server_connection.sfd != JB_INVALID_SOCKET) + && socket_is_still_alive(csp->server_connection.sfd) + && connection_destination_matches(&csp->server_connection, http, fwd)) + { + log_error(LOG_LEVEL_CONNECT, + "Reusing server socket %d connected to %s. Total requests: %u.", + csp->server_connection.sfd, csp->server_connection.host, + csp->server_connection.requests_sent_total); + } + else + { + if (csp->server_connection.sfd != JB_INVALID_SOCKET) + { +#ifdef FEATURE_CONNECTION_SHARING + if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING) + { + remember_connection(&csp->server_connection); + } + else +#endif /* def FEATURE_CONNECTION_SHARING */ + { + log_error(LOG_LEVEL_CONNECT, + "Closing server socket %d connected to %s. Total requests: %u.", + csp->server_connection.sfd, csp->server_connection.host, + csp->server_connection.requests_sent_total); + close_socket(csp->server_connection.sfd); + } + mark_connection_closed(&csp->server_connection); + } +#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */ + + csp->server_connection.sfd = forwarded_connect(fwd, http, csp); + + if (csp->server_connection.sfd == JB_INVALID_SOCKET) + { + if (fwd->type != SOCKS_NONE) + { + /* Socks error. */ + rsp = error_response(csp, "forwarding-failed"); + } + else if (errno == EINVAL) + { + rsp = error_response(csp, "no-such-domain"); + } + else + { + rsp = error_response(csp, "connect-failed"); + } + + /* Write the answer to the client */ + if (rsp != NULL) + { + send_crunch_response(csp, rsp); + } + + /* + * Temporary workaround to prevent already-read client + * bodies from being parsed as new requests. For now we + * err on the safe side and throw all the following + * requests under the bus, even if no client body has been + * buffered. A compliant client will repeat the dropped + * requests on an untainted connection. + * + * The proper fix is to discard the no longer needed + * client body in the buffer (if there is one) and to + * continue parsing the bytes that follow. + */ + drain_and_close_socket(csp->cfd); + csp->cfd = JB_INVALID_SOCKET; + + return; + } +#ifdef FEATURE_CONNECTION_KEEP_ALIVE + save_connection_destination(csp->server_connection.sfd, + http, fwd, &csp->server_connection); + csp->server_connection.keep_alive_timeout = + (unsigned)csp->config->keep_alive_timeout; + } +#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */ + + csp->server_connection.requests_sent_total++; + + if ((fwd->type == SOCKS_5T) && (NULL == csp->headers->first)) + { + /* Client headers have been sent optimistically */ + assert(csp->headers->last == NULL); + } + else if (fwd->forward_host || (http->ssl == 0)) + { + if (send_http_request(csp)) + { + rsp = error_response(csp, "connect-failed"); + if (rsp) + { + send_crunch_response(csp, rsp); + } + return; + } + } + else + { + /* + * We're running an SSL tunnel and we're not forwarding, + * so just ditch the client headers, send the "connect succeeded" + * message to the client, flush the rest, and get out of the way. + */ + list_remove_all(csp->headers); + if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED))) + { + return; + } + clear_iob(csp->client_iob); + } + + log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport); + + /* XXX: should the time start earlier for optimistically sent data? */ + csp->server_connection.request_sent = time(NULL); + + handle_established_connection(csp, fwd); +} + + +#ifdef FUZZ +/********************************************************************* + * + * Function : fuzz_server_response + * + * Description : Treat the input as a whole server response. + * + * Parameters : + * 1 : csp = Current client state (buffers, headers, etc...) + * 2 : fuzz_input_file = File to read the input from. + * + * Returns : 0 + * + *********************************************************************/ +extern int fuzz_server_response(struct client_state *csp, char *fuzz_input_file) +{ + static struct forward_spec fwd; /* Zero'd due to being static */ + csp->cfd = 0; + + if (strcmp(fuzz_input_file, "-") == 0) + { + /* XXX: Doesn'T work yet. */ + csp->server_connection.sfd = 0; + } + else + { + csp->server_connection.sfd = open(fuzz_input_file, O_RDONLY); + if (csp->server_connection.sfd == -1) + { + log_error(LOG_LEVEL_FATAL, "Failed to open %s: %E", + fuzz_input_file); + } + } + csp->content_type |= CT_GIF; + csp->action->flags |= ACTION_DEANIMATE; + csp->action->string[ACTION_STRING_DEANIMATE] = "last"; + + csp->http->path = strdup_or_die("/"); + csp->http->host = strdup_or_die("fuzz.example.org"); + csp->http->hostport = strdup_or_die("fuzz.example.org:80"); + /* Prevent client socket monitoring */ + csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING; + csp->flags |= CSP_FLAG_CHUNKED; + + csp->config->feature_flags |= RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE; + csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE; + + csp->content_type |= CT_DECLARED|CT_GIF; + + csp->config->socket_timeout = 0; + + cgi_init_error_messages(); + + handle_established_connection(csp, &fwd); + + return 0; +} +#endif + + #ifdef FEATURE_CONNECTION_KEEP_ALIVE /********************************************************************* * @@ -2692,8 +3009,6 @@ static void chat(struct client_state *csp) *********************************************************************/ static void prepare_csp_for_next_request(struct client_state *csp) { - unsigned int toggled_on_flag_set = (0 != (csp->flags & CSP_FLAG_TOGGLED_ON)); - csp->content_type = 0; csp->content_length = 0; csp->expected_content_length = 0; @@ -2704,6 +3019,10 @@ static void prepare_csp_for_next_request(struct client_state *csp) free_http_request(csp->http); destroy_list(csp->headers); destroy_list(csp->tags); +#ifdef FEATURE_CLIENT_TAGS + destroy_list(csp->client_tags); + freez(csp->client_address); +#endif free_current_action(csp->action); if (NULL != csp->fwd) { @@ -2712,7 +3031,9 @@ static void prepare_csp_for_next_request(struct client_state *csp) } /* XXX: Store per-connection flags someplace else. */ csp->flags = (CSP_FLAG_ACTIVE | CSP_FLAG_REUSED_CLIENT_CONNECTION); - if (toggled_on_flag_set) +#ifdef FEATURE_TOGGLE + if (global_toggle_state) +#endif /* def FEATURE_TOGGLE */ { csp->flags |= CSP_FLAG_TOGGLED_ON; } @@ -3003,7 +3324,7 @@ static int32 server_thread(void *data) * Returns : No. ,-) * *********************************************************************/ -static void usage(const char *myname) +static void usage(const char *name) { printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n" "Usage: %s [--config-test] " @@ -3014,8 +3335,14 @@ static void usage(const char *myname) #if defined(unix) "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] " #endif /* defined(unix) */ - "[--version] [configfile]\n" - "Aborting\n", myname); + "[--version] [configfile]\n", + name); + +#ifdef FUZZ + show_fuzz_usage(name); +#endif + + printf("Aborting\n"); exit(2); @@ -3134,6 +3461,12 @@ static void initialize_mutexes(void) privoxy_mutex_init(&log_mutex); privoxy_mutex_init(&log_init_mutex); privoxy_mutex_init(&connection_reuse_mutex); +#ifdef FEATURE_EXTERNAL_FILTERS + privoxy_mutex_init(&external_filter_mutex); +#endif +#ifdef FEATURE_CLIENT_TAGS + privoxy_mutex_init(&client_tags_mutex); +#endif /* * XXX: The assumptions below are a bit naive @@ -3165,7 +3498,6 @@ static void initialize_mutexes(void) #endif /* def MUTEX_LOCKS_AVAILABLE */ } - /********************************************************************* * * Function : main @@ -3204,6 +3536,10 @@ int main(int argc, char **argv) int do_chroot = 0; char *pre_chroot_nslookup_to_load_resolver = NULL; #endif +#ifdef FUZZ + char *fuzz_input_type = NULL; + char *fuzz_input_file = NULL; +#endif Argc = argc; Argv = argv; @@ -3331,7 +3667,20 @@ int main(int argc, char **argv) { do_config_test = 1; } - +#ifdef FUZZ + else if (strcmp(argv[argc_pos], "--fuzz") == 0) + { + argc_pos++; + if (argc < argc_pos + 2) usage(argv[0]); + fuzz_input_type = argv[argc_pos]; + argc_pos++; + fuzz_input_file = argv[argc_pos]; + } + else if (strcmp(argv[argc_pos], "--stfu") == 0) + { + set_debug_level(LOG_LEVEL_STFU); + } +#endif else if (argc_pos + 1 != argc) { /* @@ -3400,7 +3749,10 @@ int main(int argc, char **argv) * * Catch the abort, interrupt and terminate signals for a graceful exit * Catch the hangup signal so the errlog can be reopened. - * Ignore the broken pipe signals (FIXME: Why?) + * + * Ignore the broken pipe signal as connection failures + * are handled when and where they occur without relying + * on a signal. */ #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA) { @@ -3435,6 +3787,13 @@ int main(int argc, char **argv) # endif /* def _WIN_CONSOLE */ #endif /* def _WIN32 */ +#ifdef FUZZ + if (fuzz_input_type != NULL) + { + exit(process_fuzzed_input(fuzz_input_type, fuzz_input_file)); + } +#endif + if (do_config_test) { exit(NULL == load_config()); @@ -3444,7 +3803,7 @@ int main(int argc, char **argv) cgi_init_error_messages(); /* - * If runnig on unix and without the --nodaemon + * If running on unix and without the --no-daemon * option, become a daemon. I.e. fork, detach * from tty and get process group leadership */ @@ -3518,6 +3877,13 @@ int main(int argc, char **argv) close(fd); } +#ifdef FEATURE_EXTERNAL_FILTERS + for (fd = 0; fd < 3; fd++) + { + mark_socket_for_close_on_execute(fd); + } +#endif + chdir("/"); } /* -END- if (daemon_mode) */ @@ -3643,7 +4009,7 @@ int main(int argc, char **argv) * on failure. * * Parameters : - * 1 : haddr = Host addres to bind to. Use NULL to bind to + * 1 : haddr = Host address to bind to. Use NULL to bind to * INADDR_ANY. * 2 : hport = Specifies port to bind to. * @@ -3682,6 +4048,15 @@ static jb_socket bind_port_helper(const char *haddr, int hport) return JB_INVALID_SOCKET; } +#ifndef _WIN32 + if (bfd >= FD_SETSIZE) + { + log_error(LOG_LEVEL_FATAL, + "Bind socket number too high to use select(): %d >= %d", + bfd, FD_SETSIZE); + } +#endif + if (haddr == NULL) { log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses", @@ -3838,16 +4213,18 @@ static void listen_loop(void) } #endif - csp_list = (struct client_states *)zalloc(sizeof(*csp_list)); - if (NULL == csp_list) - { - log_error(LOG_LEVEL_FATAL, - "malloc(%d) for csp_list failed: %E", sizeof(*csp_list)); - continue; - } + csp_list = zalloc_or_die(sizeof(*csp_list)); csp = &csp_list->csp; - log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... "); + log_error(LOG_LEVEL_CONNECT, + "Waiting for the next client connection. Currently active threads: %d", + active_threads); + + /* + * This config may be outdated, but for accept_connection() + * it's fresh enough. + */ + csp->config = config; if (!accept_connection(csp, bfds)) { @@ -3905,9 +4282,11 @@ static void listen_loop(void) if (block_acl(NULL,csp)) { log_error(LOG_LEVEL_CONNECT, - "Connection from %s on socket %d dropped due to ACL", csp->ip_addr_str, csp->cfd); + "Connection from %s on %s (socket %d) dropped due to ACL", + csp->ip_addr_str, csp->listen_addr_str, csp->cfd); close_socket(csp->cfd); freez(csp->ip_addr_str); + freez(csp->listen_addr_str); freez(csp_list); continue; } @@ -3923,6 +4302,7 @@ static void listen_loop(void) strlen(TOO_MANY_CONNECTIONS_RESPONSE)); close_socket(csp->cfd); freez(csp->ip_addr_str); + freez(csp->listen_addr_str); freez(csp_list); continue; } @@ -4101,7 +4481,8 @@ static void listen_loop(void) * XXX: If you assume ... */ log_error(LOG_LEVEL_ERROR, - "Unable to take any additional connections: %E"); + "Unable to take any additional connections: %E. Active threads: %d", + active_threads); write_socket(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE, strlen(TOO_MANY_CONNECTIONS_RESPONSE)); close_socket(csp->cfd);