+++ /dev/null
-const char filters_rcs[] = "$Id: filters.c,v 1.36 2001/10/10 16:44:16 oes Exp $";
-/*********************************************************************
- *
- * File : $Source: /cvsroot/ijbswa/current/filters.c,v $
- *
- * Purpose : Declares functions to parse/crunch headers and pages.
- * Functions declared include:
- * `acl_addr', `add_stats', `block_acl', `block_imageurl',
- * `block_url', `url_actions', `domaincmp', `dsplit',
- * `filter_popups', `forward_url', 'redirect_url',
- * `ij_untrusted_url', `intercept_url', `pcrs_filter_respose',
- * `show_proxy_args', 'ijb_send_banner', and `trust_url'
- *
- * Copyright : Written by and Copyright (C) 2001 the SourceForge
- * IJBSWA team. http://ijbswa.sourceforge.net
- *
- * Based on the Internet Junkbuster originally written
- * by and Copyright (C) 1997 Anonymous Coders and
- * Junkbusters Corporation. http://www.junkbusters.com
- *
- * This program is free software; you can redistribute it
- * and/or modify it under the terms of the GNU General
- * Public License as published by the Free Software
- * Foundation; either version 2 of the License, or (at
- * your option) any later version.
- *
- * This program is distributed in the hope that it will
- * be useful, but WITHOUT ANY WARRANTY; without even the
- * implied warranty of MERCHANTABILITY or FITNESS FOR A
- * PARTICULAR PURPOSE. See the GNU General Public
- * License for more details.
- *
- * The GNU General Public License should be included with
- * this file. If not, you can view it at
- * http://www.gnu.org/copyleft/gpl.html
- * or write to the Free Software Foundation, Inc., 59
- * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
- * Revisions :
- * $Log: filters.c,v $
- * Revision 1.36 2001/10/10 16:44:16 oes
- * Added match_portlist function
- *
- * Revision 1.35 2001/10/07 15:41:23 oes
- * Replaced 6 boolean members of csp with one bitmap (csp->flags)
- *
- * New function remove_chunked_transfer_coding that strips chunked
- * transfer coding to plain and is called by pcrs_filter_response
- * and gif_deanimate_response if neccessary
- *
- * Improved handling of zero-change re_filter runs
- *
- * pcrs_filter_response and gif_deanimate_response now remove
- * chunked transfer codeing before processing the body.
- *
- * Revision 1.34 2001/09/20 15:49:36 steudten
- *
- * Fix BUG: Change int size to size_t size in pcrs_filter_response().
- * See cgi.c fill_template().
- *
- * Revision 1.33 2001/09/16 17:05:14 jongfoster
- * Removing unused #include showarg.h
- *
- * Revision 1.32 2001/09/16 13:21:27 jongfoster
- * Changes to use new list functions.
- *
- * Revision 1.31 2001/09/16 11:38:02 jongfoster
- * Splitting fill_template() into 2 functions:
- * template_load() loads the file
- * template_fill() performs the PCRS regexps.
- * This is because the CGI edit interface has a "table row"
- * template which is used many times in the page - this
- * change means it's only loaded from disk once.
- *
- * Revision 1.30 2001/09/16 11:00:10 jongfoster
- * New function alloc_http_response, for symmetry with free_http_response
- *
- * Revision 1.29 2001/09/13 23:32:40 jongfoster
- * Moving image data to cgi.c rather than cgi.h
- * Fixing a GPF under Win32 (and any other OS that protects global
- * constants from being written to).
- *
- * Revision 1.28 2001/09/10 10:18:51 oes
- * Silenced compiler warnings
- *
- * Revision 1.27 2001/08/05 16:06:20 jongfoster
- * Modifiying "struct map" so that there are now separate header and
- * "map_entry" structures. This means that functions which modify a
- * map no longer need to return a pointer to the modified map.
- * Also, it no longer reverses the order of the entries (which may be
- * important with some advanced template substitutions).
- *
- * Revision 1.26 2001/07/30 22:08:36 jongfoster
- * Tidying up #defines:
- * - All feature #defines are now of the form FEATURE_xxx
- * - Permanently turned off WIN_GUI_EDIT
- * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
- *
- * Revision 1.25 2001/07/26 10:09:46 oes
- * Made browser detection a little less naive
- *
- * Revision 1.24 2001/07/25 17:22:51 oes
- * Added workaround for Netscape bug that prevents display of page when loading a component fails.
- *
- * Revision 1.23 2001/07/23 13:40:12 oes
- * Fixed bug that caused document body to be dropped when pcrs joblist was empty.
- *
- * Revision 1.22 2001/07/18 12:29:34 oes
- * - Made gif_deanimate_response respect
- * csp->action->string[ACTION_STRING_DEANIMATE]
- * - Logging cosmetics
- *
- * Revision 1.21 2001/07/13 13:59:53 oes
- * - Introduced gif_deanimate_response which shares the
- * generic content modification interface of pcrs_filter_response
- * and acts as a wrapper to deanimate.c:gif_deanimate()
- * - Renamed re_process_buffer to pcrs_filter_response
- * - pcrs_filter_response now returns NULL on failiure
- * - Removed all #ifdef PCRS
- *
- * Revision 1.20 2001/07/01 17:01:04 oes
- * Added comments and missing return statement in is_untrusted_url()
- *
- * Revision 1.19 2001/06/29 21:45:41 oes
- * Indentation, CRLF->LF, Tab-> Space
- *
- * Revision 1.18 2001/06/29 13:27:38 oes
- * - Cleaned up, renamed and reorderd functions
- * and improved comments
- *
- * - block_url:
- * - Ported to CGI platform. Now delivers
- * http_response or NULL
- * - Unified HTML and GIF generation (moved image detection
- * and GIF generation here from jcc.c:chat())
- * - Fixed HTTP status to:
- * - 403 (Forbidden) for the "blocked" HTML message
- * - 200 (OK) for GIF answers
- * - 302 (Redirect) for redirect to GIF
- *
- * - trust_url:
- * - Ported to CGI platform. Now delivers
- * http_response or NULL
- * - Separated detection of untrusted URL into
- * (bool)is_untrusted_url
- * - Added enforcement of untrusted requests
- *
- * - Moved redirect_url() from cgi.c to here
- * and ported it to the CGI platform
- *
- * - Removed logentry from cancelled commit
- *
- * Revision 1.17 2001/06/09 10:55:28 jongfoster
- * Changing BUFSIZ ==> BUFFER_SIZE
- *
- * Revision 1.16 2001/06/07 23:10:26 jongfoster
- * Allowing unanchored domain patterns to back off and retry
- * if they partially match. Optimized right-anchored patterns.
- * Moving ACL and forward files into config file.
- * Replacing struct gateway with struct forward_spec
- *
- * Revision 1.15 2001/06/03 19:12:00 oes
- * extracted-CGI relevant stuff
- *
- * Revision 1.14 2001/06/01 10:30:55 oes
- * Added optional left-anchoring to domaincmp
- *
- * Revision 1.13 2001/05/31 21:21:30 jongfoster
- * Permissionsfile / actions file changes:
- * - Changed "permission" to "action" throughout
- * - changes to file format to allow string parameters
- * - Moved helper functions to actions.c
- *
- * Revision 1.12 2001/05/31 17:35:20 oes
- *
- * - Enhanced domain part globbing with infix and prefix asterisk
- * matching and optional unanchored operation
- *
- * Revision 1.11 2001/05/29 11:53:23 oes
- * "See why" link added to "blocked" page
- *
- * Revision 1.10 2001/05/29 09:50:24 jongfoster
- * Unified blocklist/imagelist/permissionslist.
- * File format is still under discussion, but the internal changes
- * are (mostly) done.
- *
- * Also modified interceptor behaviour:
- * - We now intercept all URLs beginning with one of the following
- * prefixes (and *only* these prefixes):
- * * http://i.j.b/
- * * http://ijbswa.sf.net/config/
- * * http://ijbswa.sourceforge.net/config/
- * - New interceptors "home page" - go to http://i.j.b/ to see it.
- * - Internal changes so that intercepted and fast redirect pages
- * are not replaced with an image.
- * - Interceptors now have the option to send a binary page direct
- * to the client. (i.e. ijb-send-banner uses this)
- * - Implemented show-url-info interceptor. (Which is why I needed
- * the above interceptors changes - a typical URL is
- * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
- * The previous mechanism would not have intercepted that, and
- * if it had been intercepted then it then it would have replaced
- * it with an image.)
- *
- * Revision 1.9 2001/05/27 22:17:04 oes
- *
- * - re_process_buffer no longer writes the modified buffer
- * to the client, which was very ugly. It now returns the
- * buffer, which it is then written by chat.
- *
- * - content_length now adjusts the Content-Length: header
- * for modified documents rather than crunch()ing it.
- * (Length info in csp->content_length, which is 0 for
- * unmodified documents)
- *
- * - For this to work, sed() is called twice when filtering.
- *
- * Revision 1.8 2001/05/26 17:13:28 jongfoster
- * Filled in a function comment.
- *
- * Revision 1.7 2001/05/26 15:26:15 jongfoster
- * ACL feature now provides more security by immediately dropping
- * connections from untrusted hosts.
- *
- * Revision 1.6 2001/05/26 00:28:36 jongfoster
- * Automatic reloading of config file.
- * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
- * Most of the global variables have been moved to a new
- * struct configuration_spec, accessed through csp->config->globalname
- * Most of the globals remaining are used by the Win32 GUI.
- *
- * Revision 1.5 2001/05/25 22:34:30 jongfoster
- * Hard tabs->Spaces
- *
- * Revision 1.4 2001/05/22 18:46:04 oes
- *
- * - Enabled filtering banners by size rather than URL
- * by adding patterns that replace all standard banner
- * sizes with the "Junkbuster" gif to the re_filterfile
- *
- * - Enabled filtering WebBugs by providing a pattern
- * which kills all 1x1 images
- *
- * - Added support for PCRE_UNGREEDY behaviour to pcrs,
- * which is selected by the (nonstandard and therefore
- * capital) letter 'U' in the option string.
- * It causes the quantifiers to be ungreedy by default.
- * Appending a ? turns back to greedy (!).
- *
- * - Added a new interceptor ijb-send-banner, which
- * sends back the "Junkbuster" gif. Without imagelist or
- * MSIE detection support, or if tinygif = 1, or the
- * URL isn't recognized as an imageurl, a lame HTML
- * explanation is sent instead.
- *
- * - Added new feature, which permits blocking remote
- * script redirects and firing back a local redirect
- * to the browser.
- * The feature is conditionally compiled, i.e. it
- * can be disabled with --disable-fast-redirects,
- * plus it must be activated by a "fast-redirects"
- * line in the config file, has its own log level
- * and of course wants to be displayed by show-proxy-args
- * Note: Boy, all the #ifdefs in 1001 locations and
- * all the fumbling with configure.in and acconfig.h
- * were *way* more work than the feature itself :-(
- *
- * - Because a generic redirect template was needed for
- * this, tinygif = 3 now uses the same.
- *
- * - Moved GIFs, and other static HTTP response templates
- * to project.h
- *
- * - Some minor fixes
- *
- * - Removed some >400 CRs again (Jon, you really worked
- * a lot! ;-)
- *
- * Revision 1.3 2001/05/20 16:44:47 jongfoster
- * Removing last hardcoded JunkBusters.com URLs.
- *
- * Revision 1.2 2001/05/20 01:21:20 jongfoster
- * Version 2.9.4 checkin.
- * - Merged popupfile and cookiefile, and added control over PCRS
- * filtering, in new "permissionsfile".
- * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
- * file error you now get a message box (in the Win32 GUI) rather
- * than the program exiting with no explanation.
- * - Made killpopup use the PCRS MIME-type checking and HTTP-header
- * skipping.
- * - Removed tabs from "config"
- * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
- * - Bumped up version number.
- *
- * Revision 1.1.1.1 2001/05/15 13:58:52 oes
- * Initial import of version 2.9.3 source tree
- *
- *
- *********************************************************************/
-\f
-
-#include "config.h"
-
-#include <stdio.h>
-#include <sys/types.h>
-#include <stdlib.h>
-#include <ctype.h>
-#include <string.h>
-#include <assert.h>
-
-#ifndef _WIN32
-#include <unistd.h>
-#include <netinet/in.h>
-#else
-#include <winsock2.h>
-#endif
-
-#include "project.h"
-#include "filters.h"
-#include "encode.h"
-#include "parsers.h"
-#include "ssplit.h"
-#include "errlog.h"
-#include "jbsockets.h"
-#include "miscutil.h"
-#include "actions.h"
-#include "cgi.h"
-#include "list.h"
-#include "deanimate.h"
-
-#ifdef _WIN32
-#include "win32.h"
-#endif
-
-const char filters_h_rcs[] = FILTERS_H_VERSION;
-
-/* Fix a problem with Solaris. There should be no effect on other
- * platforms.
- * Solaris's isspace() is a macro which uses it's argument directly
- * as an array index. Therefore we need to make sure that high-bit
- * characters generate +ve values, and ideally we also want to make
- * the argument match the declared parameter type of "int".
- */
-#define ijb_isdigit(__X) isdigit((int)(unsigned char)(__X))
-
-
-#ifdef FEATURE_ACL
-/*********************************************************************
- *
- * Function : block_acl
- *
- * Description : Block this request?
- * Decide yes or no based on ACL file.
- *
- * Parameters :
- * 1 : dst = The proxy or gateway address this is going to.
- * Or NULL to check all possible targets.
- * 2 : csp = Current client state (buffers, headers, etc...)
- * Also includes the client IP address.
- *
- * Returns : 0 = FALSE (don't block) and 1 = TRUE (do block)
- *
- *********************************************************************/
-int block_acl(struct access_control_addr *dst, struct client_state *csp)
-{
- struct access_control_list *acl = csp->config->acl;
-
- /* if not using an access control list, then permit the connection */
- if (acl == NULL)
- {
- return(0);
- }
-
- /* search the list */
- while (acl != NULL)
- {
- if ((csp->ip_addr_long & acl->src->mask) == acl->src->addr)
- {
- if (dst == NULL)
- {
- /* Just want to check if they have any access */
- if (acl->action == ACL_PERMIT)
- {
- return(0);
- }
- }
- else if ( ((dst->addr & acl->dst->mask) == acl->dst->addr)
- && ((dst->port == acl->dst->port) || (acl->dst->port == 0)))
- {
- if (acl->action == ACL_PERMIT)
- {
- return(0);
- }
- else
- {
- return(1);
- }
- }
- }
- acl = acl->next;
- }
-
- return(1);
-
-}
-
-
-/*********************************************************************
- *
- * Function : acl_addr
- *
- * Description : Called from `load_aclfile' to parse an ACL address.
- *
- * Parameters :
- * 1 : aspec = String specifying ACL address.
- * 2 : aca = struct access_control_addr to fill in.
- *
- * Returns : 0 => Ok, everything else is an error.
- *
- *********************************************************************/
-int acl_addr(char *aspec, struct access_control_addr *aca)
-{
- int i, masklength, port;
- char *p;
-
- masklength = 32;
- port = 0;
-
- if ((p = strchr(aspec, '/')))
- {
- *p++ = '\0';
-
- if (ijb_isdigit(*p) == 0)
- {
- return(-1);
- }
- masklength = atoi(p);
- }
-
- if ((masklength < 0) || (masklength > 32))
- {
- return(-1);
- }
-
- if ((p = strchr(aspec, ':')))
- {
- *p++ = '\0';
-
- if (ijb_isdigit(*p) == 0)
- {
- return(-1);
- }
- port = atoi(p);
- }
-
- aca->port = port;
-
- aca->addr = ntohl(resolve_hostname_to_ip(aspec));
-
- if (aca->addr == -1)
- {
- log_error(LOG_LEVEL_ERROR, "can't resolve address for %s", aspec);
- return(-1);
- }
-
- /* build the netmask */
- aca->mask = 0;
- for (i=1; i <= masklength ; i++)
- {
- aca->mask |= (1 << (32 - i));
- }
-
- /* now mask off the host portion of the ip address
- * (i.e. save on the network portion of the address).
- */
- aca->addr = aca->addr & aca->mask;
-
- return(0);
-
-}
-#endif /* def FEATURE_ACL */
-
-
-/*********************************************************************
- *
- * Function : match_portlist
- *
- * Description : Check if a given number is covered by a comma
- * separated list of numbers and ranges (a,b-c,d,..)
- *
- * Parameters :
- * 1 : portlist = String with list
- * 2 : port = port to check
- *
- * Returns : 0 => no match
- * 1 => match
- *
- *********************************************************************/
-int match_portlist(const char *portlist, int port)
-{
- char *min, *max, *next, *portlist_copy;
-
- min = next = portlist_copy = strdup(portlist);
-
- /*
- * Zero-terminate first item and remember offset for next
- */
- if (NULL != (next = strchr(portlist_copy, (int) ',')))
- {
- *next++ = '\0';
- }
-
- /*
- * Loop through all items, checking for match
- */
- while(min)
- {
- if (NULL == (max = strchr(min, (int) '-')))
- {
- /*
- * No dash, check for equality
- */
- if (port == atoi(min))
- {
- free(portlist_copy);
- return(1);
- }
- }
- else
- {
- /*
- * This is a range, so check if between min and max,
- * or, if max was omitted, between min and 65K
- */
- *max++ = '\0';
- if(port >= atoi(min) && port <= (atoi(max) ? atoi(max) : 65535))
- {
- free(portlist_copy);
- return(1);
- }
-
- }
-
- /*
- * Jump to next item
- */
- min = next;
-
- /*
- * Zero-terminate next item and remember offset for n+1
- */
- if ((NULL != next) && (NULL != (next = strchr(next, (int) ','))))
- {
- *next++ = '\0';
- }
- }
-
- free(portlist_copy);
- return 0;
-
-}
-
-
-/*********************************************************************
- *
- * Function : block_url
- *
- * Description : Called from `chat'. Check to see if we need to block this.
- *
- * Parameters :
- * 1 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : NULL => unblocked, else HTTP block response
- *
- *********************************************************************/
-struct http_response *block_url(struct client_state *csp)
-{
-#ifdef FEATURE_IMAGE_BLOCKING
- char *p;
-#endif /* def FEATURE_IMAGE_BLOCKING */
- struct http_response *rsp;
-
- /*
- * If it's not blocked, don't block it ;-)
- */
- if ((csp->action->flags & ACTION_BLOCK) == 0)
- {
- return(NULL);
- }
-
- /*
- * Else, prepare a response
- */
- if (NULL == (rsp = alloc_http_response()))
- {
- return NULL;
- }
-
- /*
- * If it's an image-url, send back an image or redirect
- * as specified by the relevant +image action
- */
-#ifdef FEATURE_IMAGE_BLOCKING
- if (((csp->action->flags & ACTION_IMAGE_BLOCKER) != 0)
- && is_imageurl(csp))
- {
- /* determine HOW images should be blocked */
- p = csp->action->string[ACTION_STRING_IMAGE_BLOCKER];
-
- /* and handle accordingly: */
- if ((p == NULL) || (0 == strcmpic(p, "logo")))
- {
- rsp->body = bindup(image_junkbuster_gif_data, image_junkbuster_gif_length);
- rsp->content_length = image_junkbuster_gif_length;
- enlist_unique_header(rsp->headers, "Content-Type", "image/gif");
- }
-
- else if (0 == strcmpic(p, "blank"))
- {
- rsp->body = bindup(image_blank_gif_data, image_blank_gif_length);
- rsp->content_length = image_blank_gif_length;
- enlist_unique_header(rsp->headers, "Content-Type", "image/gif");
- }
-
- else
- {
- rsp->status = strdup("302 Local Redirect from Junkbuster");
- enlist_unique_header(rsp->headers, "Location", p);
- }
- }
- else
-#endif /* def FEATURE_IMAGE_BLOCKING */
-
- /*
- * Else, generate an HTML "blocked" message:
- */
- {
- struct map * exports = default_exports(csp, NULL);
-#ifdef FEATURE_FORCE_LOAD
- map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
-#else /* ifndef FEATURE_FORCE_LOAD */
- map_block_killer(exports, "force-support");
-#endif /* ndef FEATURE_FORCE_LOAD */
-
- map(exports, "hostport", 1, csp->http->hostport, 1);
- map(exports, "hostport-html", 1, html_encode(csp->http->hostport), 0);
- map(exports, "path", 1, csp->http->path, 1);
- map(exports, "path-html", 1, html_encode(csp->http->path), 0);
-
- rsp->body = template_load(csp, "blocked");
- template_fill(&rsp->body, exports);
- free_map(exports);
-
- /* FIXME */
-#ifdef __EMX__
- /*
- * The entire OS/2 community will hit the stupid Netscape bug
- * (all three of us! :-) so we'll just keep ourselves out
- * of this contentious debate and special-case ourselves.
- * The problem is... a this point in parsing, we don't know
- * what the csp->http->user_agent is (yet). So we can't use
- * it to decide if we should work around the NS bug or not.
- */
- rsp->status = strdup("200 Request for blocked URL");
-#else
- /*
- * Workaround for stupid Netscape bug which prevents
- * pages from being displayed if loading a referenced
- * JavaScript or style sheet fails. So make it appear
- * as if it succeeded.
- */
- if (csp->http->user_agent
- && !strncmpic(csp->http->user_agent, "mozilla", 7)
- && !strstr(csp->http->user_agent, "compatible")
- && !strstr(csp->http->user_agent, "Opera"))
- {
- rsp->status = strdup("200 Request for blocked URL");
- }
- else
- {
- rsp->status = strdup("404 Request for blocked URL");
- }
-#endif /* __EMX__ */
- }
-
- return(finish_http_response(rsp));
-
-}
-
-
-#ifdef FEATURE_TRUST
-/*********************************************************************
- *
- * Function : trust_url FIXME: I should be called distrust_url
- *
- * Description : Calls is_untrusted_url to determine if the URL is trusted
- * and if not, returns a HTTP 304 response with a reject message.
- *
- * Parameters :
- * 1 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : NULL => trusted, else http_response.
- *
- *********************************************************************/
-struct http_response *trust_url(struct client_state *csp)
-{
- struct http_response *rsp;
- struct map * exports;
- char buf[BUFFER_SIZE], *p = NULL;
- struct url_spec **tl, *t;
-
- /*
- * Don't bother to work on trusted URLs
- */
- if (!is_untrusted_url(csp))
- {
- return NULL;
- }
-
- /*
- * Else, prepare a response:
- */
- if (NULL == (rsp = alloc_http_response()))
- {
- return NULL;
- }
-
- exports = default_exports(csp, NULL);
-
- /*
- * Export the host, port, and referrer information
- */
- map(exports, "hostport", 1, csp->http->hostport, 1);
- map(exports, "path", 1, csp->http->path, 1);
- map(exports, "hostport-html", 1, html_encode(csp->http->hostport), 0);
- map(exports, "path-html", 1, html_encode(csp->http->path), 0);
-
- if (csp->referrer && strlen(csp->referrer) > 9)
- {
- map(exports, "referrer", 1, csp->referrer + 9, 1);
- map(exports, "referrer-html", 1, html_encode(csp->referrer + 9), 0);
- }
- else
- {
- map(exports, "referrer", 1, "unknown", 1);
- map(exports, "referrer-html", 1, "unknown", 1);
- }
-
- /*
- * Export the trust list
- */
- for (tl = csp->config->trust_list; (t = *tl) ; tl++)
- {
- sprintf(buf, "<li>%s</li>\n", t->spec);
- p = strsav(p, buf);
- }
- map(exports, "trusted-referrers", 1, p, 0);
- p = NULL;
-
- /*
- * Export the trust info, if available
- */
- if (csp->config->trust_info->first)
- {
- struct list_entry *l;
-
- for (l = csp->config->trust_info->first; l ; l = l->next)
- {
- sprintf(buf, "<li> <a href=%s>%s</a><br>\n",l->str, l->str);
- p = strsav(p, buf);
- }
- map(exports, "trust-info", 1, p, 0);
- }
- else
- {
- map_block_killer(exports, "have-trust-info");
- }
-
- /*
- * Export the force prefix or the force conditional block killer
- */
-#ifdef FEATURE_FORCE_LOAD
- map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
-#else /* ifndef FEATURE_FORCE_LOAD */
- map_block_killer(exports, "force-support");
-#endif /* ndef FEATURE_FORCE_LOAD */
-
- /*
- * Build the response
- */
- rsp->body = template_load(csp, "untrusted");
- template_fill(&rsp->body, exports);
- free_map(exports);
-
- return(finish_http_response(rsp));
-
-}
-#endif /* def FEATURE_TRUST */
-
-
-#ifdef FEATURE_FAST_REDIRECTS
-/*********************************************************************
- *
- * Function : redirect_url
- *
- * Description : Checks for redirection URLs and returns a HTTP redirect
- * to the destination URL, if necessary
- *
- * Parameters :
- * 1 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : NULL if URL was clean, HTTP redirect otherwise.
- *
- *********************************************************************/
-struct http_response *redirect_url(struct client_state *csp)
-{
- char *p, *q;
- struct http_response *rsp;
-
- p = q = csp->http->path;
- log_error(LOG_LEVEL_REDIRECTS, "checking path for redirects: %s", p);
-
- /*
- * find the last URL encoded in the request
- */
- while ((p = strstr(p, "http://")))
- {
- q = p++;
- }
-
- /*
- * if there was any, generate and return a HTTP redirect
- */
- if (q != csp->http->path)
- {
- log_error(LOG_LEVEL_REDIRECTS, "redirecting to: %s", q);
-
- if (NULL == (rsp = alloc_http_response()))
- {
- return NULL;
- }
-
- rsp->status = strdup("302 Local Redirect from Junkbuster");
- enlist_unique_header(rsp->headers, "Location", q);
-
- return(finish_http_response(rsp));
- }
- else
- {
- return(NULL);
- }
-
-}
-#endif /* def FEATURE_FAST_REDIRECTS */
-
-
-#ifdef FEATURE_IMAGE_BLOCKING
-/*********************************************************************
- *
- * Function : is_imageurl
- *
- * Description : Given a URL, decide whether it is an image or not,
- * using either the info from a previous +image action
- * or, #ifdef FEATURE_IMAGE_DETECT_MSIE, the info from
- * the browser's accept header.
- *
- * Parameters :
- * 1 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : True (nonzero) if URL is an image, false (0)
- * otherwise
- *
- *********************************************************************/
-int is_imageurl(struct client_state *csp)
-{
-#ifdef FEATURE_IMAGE_DETECT_MSIE
- if ((csp->accept_types
- & (ACCEPT_TYPE_IS_MSIE|ACCEPT_TYPE_MSIE_IMAGE|ACCEPT_TYPE_MSIE_HTML))
- == (ACCEPT_TYPE_IS_MSIE|ACCEPT_TYPE_MSIE_IMAGE))
- {
- return 1;
- }
- else if ((csp->accept_types
- & (ACCEPT_TYPE_IS_MSIE|ACCEPT_TYPE_MSIE_IMAGE|ACCEPT_TYPE_MSIE_HTML))
- == (ACCEPT_TYPE_IS_MSIE|ACCEPT_TYPE_MSIE_HTML))
- {
- return 0;
- }
-#endif /* def FEATURE_IMAGE_DETECT_MSIE */
-
- return ((csp->action->flags & ACTION_IMAGE) != 0);
-
-}
-#endif /* def FEATURE_IMAGE_BLOCKING */
-
-
-#ifdef FEATURE_COOKIE_JAR
-/*********************************************************************
- *
- * Function : is_untrusted_url
- *
- * Description : Should we "distrust" this URL (and block it)?
- *
- * Yes if it matches a line in the trustfile, or if the
- * referrer matches a line starting with "+" in the
- * trustfile.
- * No otherwise.
- *
- * Parameters :
- * 1 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : 0 => trusted, 1 => untrusted
- *
- *********************************************************************/
-int is_untrusted_url(struct client_state *csp)
-{
- struct file_list *fl;
- struct block_spec *b;
- struct url_spec url[1], **tl, *t;
- struct http_request rhttp[1];
- char *p, *h;
-
- /*
- * If we don't have a trustlist, we trust everybody
- */
- if (((fl = csp->tlist) == NULL) || ((b = fl->f) == NULL))
- {
- return(0);
- }
-
-
- /*
- * Do we trust the request URL itself?
- */
- *url = dsplit(csp->http->host);
-
- /* if splitting the domain fails, punt */
- if (url->dbuf == NULL) return(0);
-
- memset(rhttp, '\0', sizeof(*rhttp));
-
- for (b = b->next; b ; b = b->next)
- {
- if ((b->url->port == 0) || (b->url->port == csp->http->port))
- {
- if ((b->url->domain[0] == '\0') || (domaincmp(b->url, url) == 0))
- {
- if ((b->url->path == NULL) ||
-#ifdef REGEX
- (regexec(b->url->preg, csp->http->path, 0, NULL, 0) == 0)
-#else
- (strncmp(b->url->path, csp->http->path, b->url->pathlen) == 0)
-#endif
- )
- {
- freez(url->dbuf);
- freez(url->dvec);
-
- if (b->reject == 0) return(0);
-
- return(1);
- }
- }
- }
- }
-
- freez(url->dbuf);
- freez(url->dvec);
-
- if ((csp->referrer == NULL)|| (strlen(csp->referrer) <= 9))
- {
- /* no referrer was supplied */
- return(1);
- }
-
- /* forge a URL from the referrer so we can use
- * convert_url() to parse it into its components.
- */
-
- p = NULL;
- p = strsav(p, "GET ");
- p = strsav(p, csp->referrer + 9); /* skip over "Referer: " */
- p = strsav(p, " HTTP/1.0");
-
- parse_http_request(p, rhttp, csp);
- freez(p);
-
- if (rhttp->cmd == NULL)
- {
- return(1);
- }
-
-
- /*
- * If not, do we maybe trust its referrer?
- */
- *url = dsplit(rhttp->host);
-
- /* if splitting the domain fails, punt */
- if (url->dbuf == NULL) return(1);
-
- for (tl = csp->config->trust_list; (t = *tl) ; tl++)
- {
- if ((t->port == 0) || (t->port == rhttp->port))
- {
- if ((t->domain[0] == '\0') || domaincmp(t, url) == 0)
- {
- if ((t->path == NULL) ||
-#ifdef REGEX
- (regexec(t->preg, rhttp->path, 0, NULL, 0) == 0)
-#else
- (strncmp(t->path, rhttp->path, t->pathlen) == 0)
-#endif
- )
- {
- /* if the URL's referrer is from a trusted referrer, then
- * add the target spec to the trustfile as an unblocked
- * domain and return NULL (which means it's OK).
- */
-
- FILE *fp;
-
- freez(url->dbuf);
- freez(url->dvec);
-
- if ((fp = fopen(csp->config->trustfile, "a")))
- {
- h = NULL;
-
- h = strsav(h, "~");
- h = strsav(h, csp->http->hostport);
-
- p = csp->http->path;
- if ((*p++ == '/')
- && (*p++ == '~'))
- {
- /* since this path points into a user's home space
- * be sure to include this spec in the trustfile.
- */
- if ((p = strchr(p, '/')))
- {
- *p = '\0';
- h = strsav(h, csp->http->path); /* FIXME: p?! */
- h = strsav(h, "/");
- }
- }
-
- fprintf(fp, "%s\n", h);
- freez(h);
- fclose(fp);
- }
- return(0);
- }
- }
- }
- }
- return(1);
-}
-#endif /* def FEATURE_COOKIE_JAR */
-
-
-/*********************************************************************
- *
- * Function : pcrs_filter_response
- *
- * Description : Apply all the pcrs jobs from the joblist (re_filterfile)
- * to the text buffer that's been accumulated in
- * csp->iob->buf and set csp->content_length to the modified
- * size and raise the CSP_FLAG_MODIFIED flag if appropriate.
- *
- * Parameters :
- * 1 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : a pointer to the (newly allocated) modified buffer.
- * or NULL in case something went wrong
- *
- *********************************************************************/
-char *pcrs_filter_response(struct client_state *csp)
-{
- int hits=0;
- size_t size;
-
- char *old = csp->iob->cur, *new = NULL;
- pcrs_job *job;
-
- struct file_list *fl;
- struct re_filterfile_spec *b;
-
- /* Sanity first */
- if (csp->iob->cur >= csp->iob->eod)
- {
- return(NULL);
- }
- size = csp->iob->eod - csp->iob->cur;
-
- /*
- * If the body has a "chunked" transfer-encoding,
- * get rid of it first, adjusting size and iob->eod
- */
- if (csp->flags & CSP_FLAG_CHUNKED)
- {
- log_error(LOG_LEVEL_RE_FILTER, "Need to de-chunk first");
- if (0 == (size = remove_chunked_transfer_coding(csp->iob->cur, size)))
- {
- return(NULL);
- }
- csp->iob->eod = csp->iob->cur + size;
- csp->flags |= CSP_FLAG_MODIFIED;
- }
-
- if ( ( NULL == (fl = csp->rlist) ) || ( NULL == (b = fl->f) ) )
- {
- log_error(LOG_LEVEL_ERROR, "Unable to get current state of regexp filtering.");
- return(NULL);
- }
-
- if ( NULL == b->joblist )
- {
- log_error(LOG_LEVEL_RE_FILTER, "Empty joblist. Nothing to do.");
- return(NULL);
- }
-
- log_error(LOG_LEVEL_RE_FILTER, "re_filtering %s%s (size %d) ...",
- csp->http->hostport, csp->http->path, size);
-
- /* Apply all jobs from the joblist */
- for (job = b->joblist; NULL != job; job = job->next)
- {
- hits += pcrs_execute(job, old, size, &new, &size);
- if (old != csp->iob->cur) free(old);
- old=new;
- }
-
- log_error(LOG_LEVEL_RE_FILTER, " produced %d hits (new size %d).", hits, size);
-
- /*
- * If there were no hits, destroy our copy and let
- * chat() use the original in csp->iob
- */
- if (!hits)
- {
- free(new);
- return(NULL);
- }
-
- csp->flags |= CSP_FLAG_MODIFIED;
- csp->content_length = size;
- IOB_RESET(csp);
-
- return(new);
-
-}
-
-
-/*********************************************************************
- *
- * Function : gif_deanimate_response
- *
- * Description : Deanimate the GIF image that has been accumulated in
- * csp->iob->buf, set csp->content_length to the modified
- * size and raise the CSP_FLAG_MODIFIED flag.
- *
- * Parameters :
- * 1 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : a pointer to the (newly allocated) modified buffer.
- * or NULL in case something went wrong.
- *
- *********************************************************************/
-char *gif_deanimate_response(struct client_state *csp)
-{
- struct binbuffer *in, *out;
- char *p;
- int size = csp->iob->eod - csp->iob->cur;
-
- /*
- * If the body has a "chunked" transfer-encoding,
- * get rid of it first, adjusting size and iob->eod
- */
- if (csp->flags & CSP_FLAG_CHUNKED)
- {
- log_error(LOG_LEVEL_DEANIMATE, "Need to de-chunk first");
- if (0 == (size = remove_chunked_transfer_coding(csp->iob->cur, size)))
- {
- return(NULL);
- }
- csp->iob->eod = csp->iob->cur + size;
- csp->flags |= CSP_FLAG_MODIFIED;
- }
-
- if ( (NULL == (in = (struct binbuffer *)zalloc(sizeof *in )))
- || (NULL == (out = (struct binbuffer *)zalloc(sizeof *out))) )
- {
- log_error(LOG_LEVEL_DEANIMATE, "failed! (no mem)");
- return NULL;
- }
-
- in->buffer = csp->iob->cur;
- in->size = size;
-
- if (gif_deanimate(in, out, strncmp("last", csp->action->string[ACTION_STRING_DEANIMATE], 4)))
- {
- log_error(LOG_LEVEL_DEANIMATE, "failed! (gif parsing)");
- free(in);
- buf_free(out);
- return(NULL);
- }
- else
- {
- log_error(LOG_LEVEL_DEANIMATE, "Success! GIF shrunk from %d bytes to %d.", size, out->offset);
- csp->content_length = out->offset;
- csp->flags |= CSP_FLAG_MODIFIED;
- p = out->buffer;
- free(in);
- free(out);
- return(p);
- }
-
-}
-
-
-/*********************************************************************
- *
- * Function : remove_chunked_transfer_coding
- *
- * Description : In-situ remove the "chunked" transfer coding as defined
- * in rfc2616 from a buffer.
- *
- * Parameters :
- * 1 : buffer = Pointer to the text buffer
- * 2 : size = Number of bytes to be processed
- *
- * Returns : The new size, i.e. the number of bytes from buffer which
- * are occupied by the stripped body, or 0 in case something
- * went wrong
- *
- *********************************************************************/
-int remove_chunked_transfer_coding(char *buffer, const size_t size)
-{
- size_t newsize = 0;
- unsigned int chunksize = 0;
- char *from_p, *to_p;
-
- assert(buffer);
- from_p = to_p = buffer;
-
- if (sscanf(buffer, "%x", &chunksize) != 1)
- {
- log_error(LOG_LEVEL_ERROR, "Invalid first chunksize while stripping \"chunked\" transfer coding");
- return(0);
- }
-
- while (chunksize > 0)
- {
- if (NULL == (from_p = strstr(from_p, "\r\n")))
- {
- log_error(LOG_LEVEL_ERROR, "Parse error while stripping \"chunked\" transfer coding");
- return(0);
- }
- newsize += chunksize;
- from_p += 2;
-
- memmove(to_p, from_p, (size_t) chunksize);
- to_p = buffer + newsize;
- from_p += chunksize + 2;
-
- if (sscanf(from_p, "%x", &chunksize) != 1)
- {
- log_error(LOG_LEVEL_ERROR, "Parse error while stripping \"chunked\" transfer coding");
- return(0);
- }
- }
-
- /* FIXME: Should this get its own loglevel? */
- log_error(LOG_LEVEL_RE_FILTER, "De-chunking successful. Shrunk from %d to %d\n", size, newsize);
- return(newsize);
-
-}
-
-
-/*********************************************************************
- *
- * Function : url_actions
- *
- * Description : Gets the actions for this URL.
- *
- * Parameters :
- * 1 : http = http_request request for blocked URLs
- * 2 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : N/A
- *
- *********************************************************************/
-void url_actions(struct http_request *http,
- struct client_state *csp)
-{
- struct file_list *fl;
- struct url_actions *b;
-
- init_current_action(csp->action);
-
- if (((fl = csp->actions_list) == NULL) || ((b = fl->f) == NULL))
- {
- return;
- }
-
- apply_url_actions(csp->action, http, b);
-
-}
-
-
-/*********************************************************************
- *
- * Function : apply_url_actions
- *
- * Description : Applies a list of URL actions.
- *
- * Parameters :
- * 1 : action = Destination.
- * 2 : http = Current URL
- * 3 : b = list of URL actions to apply
- *
- * Returns : N/A
- *
- *********************************************************************/
-void apply_url_actions(struct current_action_spec *action,
- struct http_request *http,
- struct url_actions *b)
-{
- struct url_spec url[1];
-
- if (b == NULL)
- {
- /* Should never happen */
- return;
- }
-
- *url = dsplit(http->host);
-
- /* if splitting the domain fails, punt */
- if (url->dbuf == NULL)
- {
- return;
- }
-
- for (b = b->next; NULL != b; b = b->next)
- {
- if ((b->url->port == 0) || (b->url->port == http->port))
- {
- if ((b->url->domain[0] == '\0') || (domaincmp(b->url, url) == 0))
- {
- if ((b->url->path == NULL) ||
-#ifdef REGEX
- (regexec(b->url->preg, http->path, 0, NULL, 0) == 0)
-#else
- (strncmp(b->url->path, http->path, b->url->pathlen) == 0)
-#endif
- )
- {
- merge_current_action(action, b->action);
- }
- }
- }
- }
-
- freez(url->dbuf);
- freez(url->dvec);
-}
-
-
-/*********************************************************************
- *
- * Function : forward_url
- *
- * Description : Should we forward this to another proxy?
- *
- * Parameters :
- * 1 : http = http_request request for current URL
- * 2 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : Pointer to forwarding information.
- *
- *********************************************************************/
-const struct forward_spec * forward_url(struct http_request *http,
- struct client_state *csp)
-{
- static const struct forward_spec fwd_default[1] = { FORWARD_SPEC_INITIALIZER };
- struct forward_spec *fwd = csp->config->forward;
- struct url_spec url[1];
-
- if (fwd == NULL)
- {
- return(fwd_default);
- }
-
- *url = dsplit(http->host);
-
- /* if splitting the domain fails, punt */
- if (url->dbuf == NULL)
- {
- return(fwd_default);
- }
-
- while (fwd != NULL)
- {
- if ((fwd->url->port == 0) || (fwd->url->port == http->port))
- {
- if ((fwd->url->domain[0] == '\0') || (domaincmp(fwd->url, url) == 0))
- {
- if ((fwd->url->path == NULL) ||
-#ifdef REGEX
- (regexec(fwd->url->preg, http->path, 0, NULL, 0) == 0)
-#else
- (strncmp(fwd->url->path, http->path, fwd->url->pathlen) == 0)
-#endif
- )
- {
- freez(url->dbuf);
- freez(url->dvec);
- return(fwd);
- }
- }
- }
- fwd = fwd->next;
- }
-
- freez(url->dbuf);
- freez(url->dvec);
- return(fwd_default);
-
-}
-
-
-/*********************************************************************
- *
- * Function : dsplit
- *
- * Description : Takes a domain and returns a pointer to a url_spec
- * structure populated with dbuf, dcnt and dvec. The
- * other fields in the structure that is returned are zero.
- *
- * Parameters :
- * 1 : domain = a URL address
- *
- * Returns : url_spec structure populated with dbuf, dcnt and dvec.
- *
- *********************************************************************/
-struct url_spec dsplit(char *domain)
-{
- struct url_spec ret[1];
- char *v[BUFFER_SIZE];
- int size;
- char *p;
-
- memset(ret, '\0', sizeof(*ret));
-
- if (domain[strlen(domain) - 1] == '.')
- {
- ret->unanchored |= ANCHOR_RIGHT;
- }
-
- if (domain[0] == '.')
- {
- ret->unanchored |= ANCHOR_LEFT;
- }
-
- ret->dbuf = strdup(domain);
-
- /* map to lower case */
- for (p = ret->dbuf; *p ; p++) *p = tolower(*p);
-
- /* split the domain name into components */
- ret->dcnt = ssplit(ret->dbuf, ".", v, SZ(v), 1, 1);
-
- if (ret->dcnt <= 0)
- {
- memset(ret, '\0', sizeof(ret));
- return(*ret);
- }
-
- /* save a copy of the pointers in dvec */
- size = ret->dcnt * sizeof(*ret->dvec);
-
- if ((ret->dvec = (char **)malloc(size)))
- {
- memcpy(ret->dvec, v, size);
- }
-
- return(*ret);
-
-}
-
-
-/*********************************************************************
- *
- * Function : simple_domaincmp
- *
- * Description : Domain-wise Compare fqdn's. The comparison is
- * both left- and right-anchored. The individual
- * domain names are compared with simplematch().
- * This is only used by domaincmp.
- *
- * Parameters :
- * 1 : pv = array of patterns to compare
- * 2 : fv = array of domain components to compare
- * 3 : len = length of the arrays (both arrays are the
- * same length - if they weren't, it couldn't
- * possibly be a match).
- *
- * Returns : 0 => domains are equivalent, else no match.
- *
- *********************************************************************/
-static int simple_domaincmp(char **pv, char **fv, int len)
-{
- int n;
-
- for (n = 0; n < len; n++)
- {
- if (simplematch(pv[n], fv[n]))
- {
- return 1;
- }
- }
-
- return 0;
-
-}
-
-
-/*********************************************************************
- *
- * Function : domaincmp
- *
- * Description : Domain-wise Compare fqdn's. Governed by the bimap in
- * pattern->unachored, the comparison is un-, left-,
- * right-anchored, or both.
- * The individual domain names are compared with
- * simplematch().
- *
- * Parameters :
- * 1 : pattern = a domain that may contain a '*' as a wildcard.
- * 2 : fqdn = domain name against which the patterns are compared.
- *
- * Returns : 0 => domains are equivalent, else no match.
- *
- *********************************************************************/
-int domaincmp(struct url_spec *pattern, struct url_spec *fqdn)
-{
- char **pv, **fv; /* vectors */
- int plen, flen;
- int unanchored = pattern->unanchored & (ANCHOR_RIGHT | ANCHOR_LEFT);
-
- plen = pattern->dcnt;
- flen = fqdn->dcnt;
-
- if (flen < plen)
- {
- /* fqdn is too short to match this pattern */
- return 1;
- }
-
- pv = pattern->dvec;
- fv = fqdn->dvec;
-
- if (unanchored == ANCHOR_LEFT)
- {
- /*
- * Right anchored.
- *
- * Convert this into a fully anchored pattern with
- * the fqdn and pattern the same length
- */
- fv += (flen - plen); /* flen - plen >= 0 due to check above */
- return simple_domaincmp(pv, fv, plen);
- }
- else if (unanchored == 0)
- {
- /* Fully anchored, check length */
- if (flen != plen)
- {
- return 1;
- }
- return simple_domaincmp(pv, fv, plen);
- }
- else if (unanchored == ANCHOR_RIGHT)
- {
- /* Left anchored, ignore all extra in fqdn */
- return simple_domaincmp(pv, fv, plen);
- }
- else
- {
- /* Unanchored */
- int n;
- int maxn = flen - plen;
- for (n = 0; n <= maxn; n++)
- {
- if (!simple_domaincmp(pv, fv, plen))
- {
- return 0;
- }
- /*
- * Doesn't match from start of fqdn
- * Try skipping first part of fqdn
- */
- fv++;
- }
- return 1;
- }
-
-}
-
-
-/*
- Local Variables:
- tab-width: 3
- end:
-*/
projects / privoxy.git / blobdiff