-const char filters_rcs[] = "$Id: filters.c,v 1.32 2001/09/16 13:21:27 jongfoster Exp $";
+const char filters_rcs[] = "$Id: filters.c,v 1.124 2009/08/19 15:24:30 fabiankeil 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',
+ * `block_url', `url_actions', `domain_split',
* `filter_popups', `forward_url', 'redirect_url',
* `ij_untrusted_url', `intercept_url', `pcrs_filter_respose',
- * `show_proxy_args', 'ijb_send_banner', and `trust_url'
+ * `ijb_send_banner', `trust_url', `gif_deanimate_response',
+ * `execute_single_pcrs_command', `rewrite_url',
+ * `get_last_url'
*
- * Copyright : Written by and Copyright (C) 2001 the SourceForge
- * IJBSWA team. http://ijbswa.sourceforge.net
+ * Copyright : Written by and Copyright (C) 2001, 2004-2009 the
+ * Privoxy team. http://www.privoxy.org/
*
* Based on the Internet Junkbuster originally written
- * by and Copyright (C) 1997 Anonymous Coders and
+ * by and Copyright (C) 1997 Anonymous Coders and
* Junkbusters Corporation. http://www.junkbusters.com
*
- * This program is free software; you can redistribute it
+ * 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
* or write to the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
- * Revisions :
- * $Log: filters.c,v $
- * Revision 1.32 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 <stdlib.h>
#include <ctype.h>
#include <string.h>
+#include <assert.h>
+
+#ifdef HAVE_RFC2553
+#include <netdb.h>
+#include <sys/socket.h>
+#endif /* def HAVE_RFC2553 */
#ifndef _WIN32
+#ifndef __OS2__
#include <unistd.h>
+#endif /* ndef __OS2__ */
#include <netinet/in.h>
#else
#include <winsock2.h>
-#endif
+#endif /* ndef _WIN32 */
+
+#ifdef __OS2__
+#include <utils.h>
+#endif /* def __OS2__ */
#include "project.h"
#include "filters.h"
#include "cgi.h"
#include "list.h"
#include "deanimate.h"
+#include "urlmatch.h"
+#include "loaders.h"
#ifdef _WIN32
#include "win32.h"
*/
#define ijb_isdigit(__X) isdigit((int)(unsigned char)(__X))
+static jb_err remove_chunked_transfer_coding(char *buffer, size_t *size);
+static jb_err prepare_for_filtering(struct client_state *csp);
#ifdef FEATURE_ACL
+#ifdef HAVE_RFC2553
+/*********************************************************************
+ *
+ * Function : sockaddr_storage_to_ip
+ *
+ * Description : Access internal structure of sockaddr_storage
+ *
+ * Parameters :
+ * 1 : addr = socket address
+ * 2 : ip = IP address as array of octets in network order
+ * (it points into addr)
+ * 3 : len = length of IP address in octets
+ * 4 : port = port number in network order;
+ *
+ * Returns : 0 = no errror; -1 otherwise.
+ *
+ *********************************************************************/
+static int sockaddr_storage_to_ip(const struct sockaddr_storage *addr,
+ uint8_t **ip, unsigned int *len,
+ in_port_t **port)
+{
+ if (NULL == addr)
+ {
+ return(-1);
+ }
+
+ switch (addr->ss_family)
+ {
+ case AF_INET:
+ if (NULL != len)
+ {
+ *len = 4;
+ }
+ if (NULL != ip)
+ {
+ *ip = (uint8_t *)
+ &(((struct sockaddr_in *)addr)->sin_addr.s_addr);
+ }
+ if (NULL != port)
+ {
+ *port = &((struct sockaddr_in *)addr)->sin_port;
+ }
+ break;
+
+ case AF_INET6:
+ if (NULL != len)
+ {
+ *len = 16;
+ }
+ if (NULL != ip)
+ {
+ *ip = ((struct sockaddr_in6 *)addr)->sin6_addr.s6_addr;
+ }
+ if (NULL != port)
+ {
+ *port = &((struct sockaddr_in6 *)addr)->sin6_port;
+ }
+ break;
+
+ default:
+ /* Unsupported address family */
+ return(-1);
+ }
+
+ return(0);
+}
+
+
+/*********************************************************************
+ *
+ * Function : match_sockaddr
+ *
+ * Description : Check whether address matches network (IP address and port)
+ *
+ * Parameters :
+ * 1 : network = socket address of subnework
+ * 2 : netmask = network mask as socket address
+ * 3 : address = checked socket address against given network
+ *
+ * Returns : 0 = doesn't match; 1 = does match
+ *
+ *********************************************************************/
+static int match_sockaddr(const struct sockaddr_storage *network,
+ const struct sockaddr_storage *netmask,
+ const struct sockaddr_storage *address)
+{
+ uint8_t *network_addr, *netmask_addr, *address_addr;
+ unsigned int addr_len;
+ in_port_t *network_port, *netmask_port, *address_port;
+ int i;
+
+ if (network->ss_family != netmask->ss_family)
+ {
+ /* This should never happen */
+ log_error(LOG_LEVEL_ERROR,
+ "Internal error at %s:%llu: network and netmask differ in family",
+ __FILE__, __LINE__);
+ return 0;
+ }
+
+ sockaddr_storage_to_ip(network, &network_addr, &addr_len, &network_port);
+ sockaddr_storage_to_ip(netmask, &netmask_addr, NULL, &netmask_port);
+ sockaddr_storage_to_ip(address, &address_addr, NULL, &address_port);
+
+ /* Check for family */
+ if ((network->ss_family == AF_INET) && (address->ss_family == AF_INET6)
+ && IN6_IS_ADDR_V4MAPPED((struct in6_addr *)address_addr))
+ {
+ /* Map AF_INET6 V4MAPPED address into AF_INET */
+ address_addr += 12;
+ addr_len = 4;
+ }
+ else if ((network->ss_family == AF_INET6) && (address->ss_family == AF_INET)
+ && IN6_IS_ADDR_V4MAPPED((struct in6_addr *)network_addr))
+ {
+ /* Map AF_INET6 V4MAPPED network into AF_INET */
+ network_addr += 12;
+ netmask_addr += 12;
+ addr_len = 4;
+ }
+ else if (network->ss_family != address->ss_family)
+ {
+ return 0;
+ }
+
+ /* XXX: Port check is signaled in netmask */
+ if (*netmask_port && *network_port != *address_port)
+ {
+ return 0;
+ }
+
+ /* TODO: Optimize by checking by words insted of octets */
+ for (i = 0; (i < addr_len) && netmask_addr[i]; i++)
+ {
+ if ((network_addr[i] & netmask_addr[i]) !=
+ (address_addr[i] & netmask_addr[i]))
+ {
+ return 0;
+ }
+ }
+
+ return 1;
+}
+#endif /* def HAVE_RFC2553 */
+
+
/*********************************************************************
*
* Function : block_acl
* Returns : 0 = FALSE (don't block) and 1 = TRUE (do block)
*
*********************************************************************/
-int block_acl(struct access_control_addr *dst, struct client_state *csp)
+int block_acl(const struct access_control_addr *dst, const struct client_state *csp)
{
struct access_control_list *acl = csp->config->acl;
/* search the list */
while (acl != NULL)
{
- if ((csp->ip_addr_long & acl->src->mask) == acl->src->addr)
+ if (
+#ifdef HAVE_RFC2553
+ match_sockaddr(&acl->src->addr, &acl->src->mask, &csp->tcp_addr)
+#else
+ (csp->ip_addr_long & acl->src->mask) == acl->src->addr
+#endif
+ )
{
if (dst == NULL)
{
return(0);
}
}
- else if ( ((dst->addr & acl->dst->mask) == acl->dst->addr)
- && ((dst->port == acl->dst->port) || (acl->dst->port == 0)))
+ else if (
+#ifdef HAVE_RFC2553
+ /*
+ * XXX: An undefined acl->dst is full of zeros and should be
+ * considered a wildcard address. sockaddr_storage_to_ip()
+ * fails on such destinations because of unknown sa_familly
+ * (glibc only?). However this test is not portable.
+ *
+ * So, we signal the acl->dst is wildcard in wildcard_dst.
+ */
+ acl->wildcard_dst ||
+ match_sockaddr(&acl->dst->addr, &acl->dst->mask, &dst->addr)
+#else
+ ((dst->addr & acl->dst->mask) == acl->dst->addr)
+ && ((dst->port == acl->dst->port) || (acl->dst->port == 0))
+#endif
+ )
{
if (acl->action == ACL_PERMIT)
{
*
* Function : acl_addr
*
- * Description : Called from `load_aclfile' to parse an ACL address.
+ * Description : Called from `load_config' to parse an ACL address.
*
* Parameters :
* 1 : aspec = String specifying ACL address.
* Returns : 0 => Ok, everything else is an error.
*
*********************************************************************/
-int acl_addr(char *aspec, struct access_control_addr *aca)
+int acl_addr(const char *aspec, struct access_control_addr *aca)
{
- int i, masklength, port;
+ int i, masklength;
+#ifdef HAVE_RFC2553
+ struct addrinfo hints, *result;
+ uint8_t *mask_data;
+ in_port_t *mask_port;
+ unsigned int addr_len;
+#else
+ long port;
+#endif /* def HAVE_RFC2553 */
char *p;
+ char *acl_spec = NULL;
+#ifdef HAVE_RFC2553
+ /* XXX: Depend on ai_family */
+ masklength = 128;
+#else
masklength = 32;
port = 0;
+#endif
- if ((p = strchr(aspec, '/')))
+ /*
+ * Use a temporary acl spec copy so we can log
+ * the unmodified original in case of parse errors.
+ */
+ acl_spec = strdup(aspec);
+ if (acl_spec == NULL)
{
- *p++ = '\0';
+ /* XXX: This will be logged as parse error. */
+ return(-1);
+ }
+ if ((p = strchr(acl_spec, '/')) != NULL)
+ {
+ *p++ = '\0';
if (ijb_isdigit(*p) == 0)
{
+ freez(acl_spec);
return(-1);
}
masklength = atoi(p);
}
- if ((masklength < 0) || (masklength > 32))
+ if ((masklength < 0) ||
+#ifdef HAVE_RFC2553
+ (masklength > 128)
+#else
+ (masklength > 32)
+#endif
+ )
+ {
+ freez(acl_spec);
+ return(-1);
+ }
+
+ if ((*acl_spec == '[') && (NULL != (p = strchr(acl_spec, ']'))))
+ {
+ *p = '\0';
+ memmove(acl_spec, acl_spec + 1, (size_t)(p - acl_spec));
+
+ if (*++p != ':')
+ {
+ p = NULL;
+ }
+ }
+ else
+ {
+ p = strchr(acl_spec, ':');
+ }
+
+#ifdef HAVE_RFC2553
+ memset(&hints, 0, sizeof(struct addrinfo));
+ hints.ai_family = AF_UNSPEC;
+ hints.ai_socktype = SOCK_STREAM;
+
+ i = getaddrinfo(acl_spec, ((p) ? ++p : NULL), &hints, &result);
+
+ if (i != 0)
{
+ log_error(LOG_LEVEL_ERROR, "Can not resolve [%s]:%s: %s",
+ acl_spec, p, gai_strerror(i));
+ freez(acl_spec);
return(-1);
}
+ freez(acl_spec);
- if ((p = strchr(aspec, ':')))
+ /* TODO: Allow multihomed hostnames */
+ memcpy(&(aca->addr), result->ai_addr, result->ai_addrlen);
+ freeaddrinfo(result);
+#else
+ if (p != NULL)
{
+ char *endptr;
+
*p++ = '\0';
+ port = strtol(p, &endptr, 10);
- if (ijb_isdigit(*p) == 0)
+ if (port <= 0 || port > 65535 || *endptr != '\0')
{
+ freez(acl_spec);
return(-1);
}
- port = atoi(p);
}
- aca->port = port;
+ aca->port = (unsigned long)port;
- aca->addr = ntohl(resolve_hostname_to_ip(aspec));
+ aca->addr = ntohl(resolve_hostname_to_ip(acl_spec));
+ freez(acl_spec);
- if (aca->addr == -1)
+ if (aca->addr == INADDR_NONE)
{
- log_error(LOG_LEVEL_ERROR, "can't resolve address for %s", aspec);
+ /* XXX: This will be logged as parse error. */
return(-1);
}
+#endif /* def HAVE_RFC2553 */
/* build the netmask */
+#ifdef HAVE_RFC2553
+ /* Clip masklength according to current family. */
+ if ((aca->addr.ss_family == AF_INET) && (masklength > 32))
+ {
+ masklength = 32;
+ }
+
+ aca->mask.ss_family = aca->addr.ss_family;
+ if (sockaddr_storage_to_ip(&aca->mask, &mask_data, &addr_len, &mask_port))
+ {
+ return(-1);
+ }
+
+ if (p)
+ {
+ /* ACL contains a port number, check ports in the future. */
+ *mask_port = 1;
+ }
+
+ /*
+ * XXX: This could be optimized to operate on whole words instead
+ * of octets (128-bit CPU could do it in one iteration).
+ */
+ /*
+ * Octets after prefix can be ommitted because of
+ * previous initialization to zeros.
+ */
+ for (i = 0; (i < addr_len) && masklength; i++)
+ {
+ if (masklength >= 8)
+ {
+ mask_data[i] = 0xFF;
+ masklength -= 8;
+ }
+ else
+ {
+ /*
+ * XXX: This assumes MSB of octet is on the left side.
+ * This should be true for all architectures or solved
+ * by the link layer.
+ */
+ mask_data[i] = (uint8_t)~((1 << (8 - masklength)) - 1);
+ masklength = 0;
+ }
+ }
+
+#else
aca->mask = 0;
for (i=1; i <= masklength ; i++)
{
- aca->mask |= (1 << (32 - i));
+ aca->mask |= (1U << (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;
+#endif /* def HAVE_RFC2553 */
return(0);
#endif /* def FEATURE_ACL */
+/*********************************************************************
+ *
+ * Function : connect_port_is_forbidden
+ *
+ * Description : Check to see if CONNECT requests to the destination
+ * port of this request are forbidden. The check is
+ * independend of the actual request method.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : True if yes, false otherwise.
+ *
+ *********************************************************************/
+int connect_port_is_forbidden(const struct client_state *csp)
+{
+ return ((csp->action->flags & ACTION_LIMIT_CONNECT) &&
+ !match_portlist(csp->action->string[ACTION_STRING_LIMIT_CONNECT],
+ csp->http->port));
+}
+
+
/*********************************************************************
*
* Function : block_url
*********************************************************************/
struct http_response *block_url(struct client_state *csp)
{
-#ifdef FEATURE_IMAGE_BLOCKING
- char *p;
-#endif /* def FEATURE_IMAGE_BLOCKING */
struct http_response *rsp;
+ const char *new_content_type = NULL;
- /*
+ /*
* If it's not blocked, don't block it ;-)
*/
if ((csp->action->flags & ACTION_BLOCK) == 0)
{
- return(NULL);
+ return NULL;
}
-
- /*
+ if (csp->action->flags & ACTION_REDIRECT)
+ {
+ log_error(LOG_LEVEL_ERROR, "redirect{} overruled by block.");
+ }
+ /*
* Else, prepare a response
*/
if (NULL == (rsp = alloc_http_response()))
{
- return NULL;
+ return cgi_error_memory();
}
/*
if (((csp->action->flags & ACTION_IMAGE_BLOCKER) != 0)
&& is_imageurl(csp))
{
+ char *p;
/* determine HOW images should be blocked */
p = csp->action->string[ACTION_STRING_IMAGE_BLOCKER];
+ if(csp->action->flags & ACTION_HANDLE_AS_EMPTY_DOCUMENT)
+ {
+ log_error(LOG_LEVEL_ERROR, "handle-as-empty-document overruled by handle-as-image.");
+ }
+#if 1 /* Two alternative strategies, use this one for now: */
+
/* and handle accordingly: */
- if ((p == NULL) || (0 == strcmpic(p, "logo")))
+ if ((p == NULL) || (0 == strcmpic(p, "pattern")))
{
- 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");
+ rsp->status = strdup("403 Request blocked by Privoxy");
+ if (rsp->status == NULL)
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+ rsp->body = bindup(image_pattern_data, image_pattern_length);
+ if (rsp->body == NULL)
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+ rsp->content_length = image_pattern_length;
+
+ if (enlist_unique_header(rsp->headers, "Content-Type", BUILTIN_IMAGE_MIMETYPE))
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
}
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");
+ rsp->status = strdup("403 Request blocked by Privoxy");
+ if (rsp->status == NULL)
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+ rsp->body = bindup(image_blank_data, image_blank_length);
+ if (rsp->body == NULL)
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+ rsp->content_length = image_blank_length;
+
+ if (enlist_unique_header(rsp->headers, "Content-Type", BUILTIN_IMAGE_MIMETYPE))
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
}
else
{
- rsp->status = strdup("302 Local Redirect from Junkbuster");
- enlist_unique_header(rsp->headers, "Location", p);
+ rsp->status = strdup("302 Local Redirect from Privoxy");
+ if (rsp->status == NULL)
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+
+ if (enlist_unique_header(rsp->headers, "Location", p))
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+ }
+
+#else /* Following code is disabled for now */
+
+ /* and handle accordingly: */
+ if ((p == NULL) || (0 == strcmpic(p, "pattern")))
+ {
+ p = CGI_PREFIX "send-banner?type=pattern";
+ }
+ else if (0 == strcmpic(p, "blank"))
+ {
+ p = CGI_PREFIX "send-banner?type=blank";
+ }
+ rsp->status = strdup("302 Local Redirect from Privoxy");
+ if (rsp->status == NULL)
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+
+ if (enlist_unique_header(rsp->headers, "Location", p))
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
}
- }
+#endif /* Preceeding code is disabled for now */
+ }
else
#endif /* def FEATURE_IMAGE_BLOCKING */
+ if(csp->action->flags & ACTION_HANDLE_AS_EMPTY_DOCUMENT)
+ {
+ /*
+ * Send empty document.
+ */
+ new_content_type = csp->action->string[ACTION_STRING_CONTENT_TYPE];
- /*
+ freez(rsp->body);
+ rsp->body = strdup(" ");
+ rsp->content_length = 1;
+
+ rsp->status = strdup("403 Request blocked by Privoxy");
+ if (rsp->status == NULL)
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+ if (new_content_type != 0)
+ {
+ log_error(LOG_LEVEL_HEADER, "Overwriting Content-Type with %s", new_content_type);
+ if (enlist_unique_header(rsp->headers, "Content-Type", new_content_type))
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+ }
+ }
+ else
+
+ /*
* 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);
+ jb_err err;
+ struct map * exports;
+ char *p;
- rsp->body = template_load(csp, "blocked");
- template_fill(&rsp->body, exports);
- free_map(exports);
-
/*
* 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"))
+ if ( NULL != (p = get_header_value(csp->headers, "User-Agent:"))
+ && !strncmpic(p, "mozilla", 7) /* Catch Netscape but */
+ && !strstr(p, "Gecko") /* save Mozilla, */
+ && !strstr(p, "compatible") /* MSIE */
+ && !strstr(p, "Opera")) /* and Opera. */
{
- rsp->status = strdup("200 Request for blocked URL");
+ rsp->status = strdup("200 Request for blocked URL");
}
else
{
- rsp->status = strdup("404 Request for blocked URL");
+ rsp->status = strdup("403 Request for blocked URL");
+ }
+
+ if (rsp->status == NULL)
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+
+ exports = default_exports(csp, NULL);
+ if (exports == NULL)
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+
+#ifdef FEATURE_FORCE_LOAD
+ err = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
+ /*
+ * Export the force conditional block killer if
+ *
+ * - Privoxy was compiled without FEATURE_FORCE_LOAD, or
+ * - Privoxy is configured to enforce blocks, or
+ * - it's a CONNECT request and enforcing wouldn't work anyway.
+ */
+ if ((csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
+ || (0 == strcmpic(csp->http->gpc, "connect")))
+#endif /* ndef FEATURE_FORCE_LOAD */
+ {
+ err = map_block_killer(exports, "force-support");
+ }
+
+ if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1);
+ if (!err) err = map(exports, "hostport", 1, html_encode(csp->http->hostport), 0);
+ if (!err) err = map(exports, "path", 1, html_encode(csp->http->path), 0);
+ if (!err) err = map(exports, "path-ue", 1, url_encode(csp->http->path), 0);
+ if (!err)
+ {
+ const char *block_reason;
+ if (csp->action->string[ACTION_STRING_BLOCK] != NULL)
+ {
+ block_reason = csp->action->string[ACTION_STRING_BLOCK];
+ }
+ else
+ {
+ assert(connect_port_is_forbidden(csp));
+ block_reason = "Forbidden CONNECT port.";
+ }
+ err = map(exports, "block-reason", 1, html_encode(block_reason), 0);
+ }
+ if (err)
+ {
+ free_map(exports);
+ free_http_response(rsp);
+ return cgi_error_memory();
}
+ err = template_fill_for_cgi(csp, "blocked", exports, rsp);
+ if (err)
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
}
+ rsp->reason = RSP_REASON_BLOCKED;
- return(finish_http_response(rsp));
+ return finish_http_response(csp, rsp);
}
* 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.
+ * and if not, returns a HTTP 403 response with a reject message.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
{
struct http_response *rsp;
struct map * exports;
- char buf[BUFFER_SIZE], *p = NULL;
- struct url_spec **tl, *t;
+ char buf[BUFFER_SIZE];
+ char *p;
+ struct url_spec **tl;
+ struct url_spec *t;
+ jb_err err;
/*
* Don't bother to work on trusted URLs
return NULL;
}
- /*
+ /*
* Else, prepare a response:
*/
if (NULL == (rsp = alloc_http_response()))
{
- return NULL;
+ return cgi_error_memory();
}
+ rsp->status = strdup("403 Request blocked by Privoxy");
exports = default_exports(csp, NULL);
+ if (exports == NULL || rsp->status == NULL)
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
- /*
- * Export the host, port, and referrer information
+ /*
+ * Export the protocol, 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);
+ err = map(exports, "hostport", 1, csp->http->hostport, 1);
+ if (!err) err = map(exports, "protocol", 1, csp->http->ssl ? "https://" : "http://", 1);
+ if (!err) err = map(exports, "path", 1, csp->http->path, 1);
- if (csp->referrer && strlen(csp->referrer) > 9)
+ if (NULL != (p = get_header_value(csp->headers, "Referer:")))
{
- map(exports, "referrer", 1, csp->referrer + 9, 1);
- map(exports, "referrer-html", 1, html_encode(csp->referrer + 9), 0);
+ if (!err) err = map(exports, "referrer", 1, html_encode(p), 0);
}
else
{
- map(exports, "referrer", 1, "unknown", 1);
- map(exports, "referrer-html", 1, "unknown", 1);
+ if (!err) err = map(exports, "referrer", 1, "none set", 1);
+ }
+
+ if (err)
+ {
+ free_map(exports);
+ free_http_response(rsp);
+ return cgi_error_memory();
}
/*
* Export the trust list
*/
- for (tl = csp->config->trust_list; (t = *tl) ; tl++)
+ p = strdup("");
+ for (tl = csp->config->trust_list; (t = *tl) != NULL ; tl++)
{
- sprintf(buf, "<li>%s</li>\n", t->spec);
- p = strsav(p, buf);
+ snprintf(buf, sizeof(buf), "<li>%s</li>\n", t->spec);
+ string_append(&p, buf);
}
- map(exports, "trusted-referrers", 1, p, 0);
- p = NULL;
+ err = map(exports, "trusted-referrers", 1, p, 0);
- /*
- * Export the trust info, if available
+ if (err)
+ {
+ free_map(exports);
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+
+ /*
+ * Export the trust info, if available
*/
if (csp->config->trust_info->first)
{
struct list_entry *l;
+ p = strdup("");
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);
+ snprintf(buf, sizeof(buf), "<li> <a href=\"%s\">%s</a><br>\n", l->str, l->str);
+ string_append(&p, buf);
}
- map(exports, "trust-info", 1, p, 0);
+ err = map(exports, "trust-info", 1, p, 0);
}
else
{
- map_block_killer(exports, "have-trust-info");
+ err = map_block_killer(exports, "have-trust-info");
}
-
+
+ if (err)
+ {
+ free_map(exports);
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+
/*
- * Export the force prefix or the force conditional block killer
+ * Export the force conditional block killer if
+ *
+ * - Privoxy was compiled without FEATURE_FORCE_LOAD, or
+ * - Privoxy is configured to enforce blocks, or
+ * - it's a CONNECT request and enforcing wouldn't work anyway.
*/
#ifdef FEATURE_FORCE_LOAD
- map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
+ if ((csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
+ || (0 == strcmpic(csp->http->gpc, "connect")))
+ {
+ err = map_block_killer(exports, "force-support");
+ }
+ else
+ {
+ err = map(exports, "force-prefix", 1, FORCE_PREFIX, 1);
+ }
#else /* ifndef FEATURE_FORCE_LOAD */
- map_block_killer(exports, "force-support");
+ err = map_block_killer(exports, "force-support");
#endif /* ndef FEATURE_FORCE_LOAD */
+ if (err)
+ {
+ free_map(exports);
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+
/*
* Build the response
*/
- rsp->body = template_load(csp, "untrusted");
- template_fill(&rsp->body, exports);
- free_map(exports);
-
- return(finish_http_response(rsp));
+ err = template_fill_for_cgi(csp, "untrusted", exports, rsp);
+ if (err)
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+ rsp->reason = RSP_REASON_UNTRUSTED;
+ return finish_http_response(csp, rsp);
}
#endif /* def FEATURE_TRUST */
-#ifdef FEATURE_FAST_REDIRECTS
/*********************************************************************
*
- * Function : redirect_url
+ * Function : compile_dynamic_pcrs_job_list
*
- * Description : Checks for redirection URLs and returns a HTTP redirect
- * to the destination URL, if necessary
+ * Description : Compiles a dynamic pcrs job list (one with variables
+ * resolved at request time)
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
+ * 2 : b = The filter list to compile
*
- * Returns : NULL if URL was clean, HTTP redirect otherwise.
+ * Returns : NULL in case of errors, otherwise the
+ * pcrs job list.
*
*********************************************************************/
-struct http_response *redirect_url(struct client_state *csp)
+pcrs_job *compile_dynamic_pcrs_job_list(const struct client_state *csp, const struct re_filterfile_spec *b)
{
- char *p, *q;
- struct http_response *rsp;
+ struct list_entry *pattern;
+ pcrs_job *job_list = NULL;
+ pcrs_job *dummy = NULL;
+ pcrs_job *lastjob = NULL;
+ int error = 0;
- p = q = csp->http->path;
- log_error(LOG_LEVEL_REDIRECTS, "checking path for redirects: %s", p);
+ const struct pcrs_variable variables[] =
+ {
+ {"url", csp->http->url, 1},
+ {"path", csp->http->path, 1},
+ {"host", csp->http->host, 1},
+ {"origin", csp->ip_addr_str, 1},
+ {NULL, NULL, 1}
+ };
+
+ for (pattern = b->patterns->first; pattern != NULL; pattern = pattern->next)
+ {
+ assert(pattern->str != NULL);
- /*
- * find the last URL encoded in the request
+ dummy = pcrs_compile_dynamic_command(pattern->str, variables, &error);
+ if (NULL == dummy)
+ {
+ assert(error < 0);
+ log_error(LOG_LEVEL_ERROR,
+ "Adding filter job \'%s\' to dynamic filter %s failed: %s",
+ pattern->str, b->name, pcrs_strerror(error));
+ continue;
+ }
+ else
+ {
+ if (error == PCRS_WARN_TRUNCATION)
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "At least one of the variables in \'%s\' had to "
+ "be truncated before compilation", pattern->str);
+ }
+ if (job_list == NULL)
+ {
+ job_list = dummy;
+ }
+ else
+ {
+ lastjob->next = dummy;
+ }
+ lastjob = dummy;
+ }
+ }
+
+ return job_list;
+}
+
+
+/*********************************************************************
+ *
+ * Function : rewrite_url
+ *
+ * Description : Rewrites a URL with a single pcrs command
+ * and returns the result if it differs from the
+ * original and isn't obviously invalid.
+ *
+ * Parameters :
+ * 1 : old_url = URL to rewrite.
+ * 2 : pcrs_command = pcrs command formatted as string (s@foo@bar@)
+ *
+ *
+ * Returns : NULL if the pcrs_command didn't change the url, or
+ * the result of the modification.
+ *
+ *********************************************************************/
+char *rewrite_url(char *old_url, const char *pcrs_command)
+{
+ char *new_url = NULL;
+ int hits;
+
+ assert(old_url);
+ assert(pcrs_command);
+
+ new_url = pcrs_execute_single_command(old_url, pcrs_command, &hits);
+
+ if (hits == 0)
+ {
+ log_error(LOG_LEVEL_REDIRECTS,
+ "pcrs command \"%s\" didn't change \"%s\".",
+ pcrs_command, old_url);
+ freez(new_url);
+ }
+ else if (hits < 0)
+ {
+ log_error(LOG_LEVEL_REDIRECTS,
+ "executing pcrs command \"%s\" to rewrite %s failed: %s",
+ pcrs_command, old_url, pcrs_strerror(hits));
+ freez(new_url);
+ }
+ else if (strncmpic(new_url, "http://", 7) && strncmpic(new_url, "https://", 8))
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "pcrs command \"%s\" changed \"%s\" to \"%s\" (%u hi%s), "
+ "but the result doesn't look like a valid URL and will be ignored.",
+ pcrs_command, old_url, new_url, hits, (hits == 1) ? "t" : "ts");
+ freez(new_url);
+ }
+ else
+ {
+ log_error(LOG_LEVEL_REDIRECTS,
+ "pcrs command \"%s\" changed \"%s\" to \"%s\" (%u hi%s).",
+ pcrs_command, old_url, new_url, hits, (hits == 1) ? "t" : "ts");
+ }
+
+ return new_url;
+
+}
+
+
+#ifdef FEATURE_FAST_REDIRECTS
+/*********************************************************************
+ *
+ * Function : get_last_url
+ *
+ * Description : Search for the last URL inside a string.
+ * If the string already is a URL, it will
+ * be the first URL found.
+ *
+ * Parameters :
+ * 1 : subject = the string to check
+ * 2 : redirect_mode = +fast-redirect{} mode
+ *
+ * Returns : NULL if no URL was found, or
+ * the last URL found.
+ *
+ *********************************************************************/
+char *get_last_url(char *subject, const char *redirect_mode)
+{
+ char *new_url = NULL;
+ char *tmp;
+
+ assert(subject);
+ assert(redirect_mode);
+
+ subject = strdup(subject);
+ if (subject == NULL)
+ {
+ log_error(LOG_LEVEL_ERROR, "Out of memory while searching for redirects.");
+ return NULL;
+ }
+
+ if (0 == strcmpic(redirect_mode, "check-decoded-url"))
+ {
+ log_error(LOG_LEVEL_REDIRECTS, "Decoding \"%s\" if necessary.", subject);
+ new_url = url_decode(subject);
+ if (new_url != NULL)
+ {
+ freez(subject);
+ subject = new_url;
+ }
+ else
+ {
+ log_error(LOG_LEVEL_ERROR, "Unable to decode \"%s\".", subject);
+ }
+ }
+
+ log_error(LOG_LEVEL_REDIRECTS, "Checking \"%s\" for redirects.", subject);
+
+ /*
+ * Find the last URL encoded in the request
*/
- while ((p = strstr(p, "http://")))
+ tmp = subject;
+ while ((tmp = strstr(tmp, "http://")) != NULL)
{
- q = p++;
+ new_url = tmp++;
+ }
+ tmp = (new_url != NULL) ? new_url : subject;
+ while ((tmp = strstr(tmp, "https://")) != NULL)
+ {
+ new_url = tmp++;
}
- /*
- * if there was any, generate and return a HTTP redirect
+ if ((new_url != NULL)
+ && ( (new_url != subject)
+ || (0 == strncmpic(subject, "http://", 7))
+ || (0 == strncmpic(subject, "https://", 8))
+ ))
+ {
+ /*
+ * Return new URL if we found a redirect
+ * or if the subject already was a URL.
+ *
+ * The second case makes sure that we can
+ * chain get_last_url after another redirection check
+ * (like rewrite_url) without losing earlier redirects.
+ */
+ new_url = strdup(new_url);
+ freez(subject);
+ return new_url;
+ }
+
+ freez(subject);
+ return NULL;
+
+}
+#endif /* def FEATURE_FAST_REDIRECTS */
+
+
+/*********************************************************************
+ *
+ * Function : redirect_url
+ *
+ * Description : Checks if Privoxy should answer the request with
+ * a HTTP redirect and generates the redirect if
+ * necessary.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : NULL if the request can pass, HTTP redirect otherwise.
+ *
+ *********************************************************************/
+struct http_response *redirect_url(struct client_state *csp)
+{
+ struct http_response *rsp;
+#ifdef FEATURE_FAST_REDIRECTS
+ /*
+ * XXX: Do we still need FEATURE_FAST_REDIRECTS
+ * as compile-time option? The user can easily disable
+ * it in his action file.
*/
- if (q != csp->http->path)
+ char * redirect_mode;
+#endif /* def FEATURE_FAST_REDIRECTS */
+ char *old_url = NULL;
+ char *new_url = NULL;
+ char *redirection_string;
+
+ if ((csp->action->flags & ACTION_REDIRECT))
{
- log_error(LOG_LEVEL_REDIRECTS, "redirecting to: %s", q);
+ redirection_string = csp->action->string[ACTION_STRING_REDIRECT];
- if (NULL == (rsp = alloc_http_response()))
+ /*
+ * If the redirection string begins with 's',
+ * assume it's a pcrs command, otherwise treat it as
+ * properly formatted URL and use it for the redirection
+ * directly.
+ *
+ * According to RFC 2616 section 14.30 the URL
+ * has to be absolute and if the user tries:
+ * +redirect{shit/this/will/be/parsed/as/pcrs_command.html}
+ * she would get undefined results anyway.
+ *
+ */
+
+ if (*redirection_string == 's')
+ {
+ old_url = csp->http->url;
+ new_url = rewrite_url(old_url, redirection_string);
+ }
+ else
{
- return NULL;
+ log_error(LOG_LEVEL_REDIRECTS,
+ "No pcrs command recognized, assuming that \"%s\" is already properly formatted.",
+ redirection_string);
+ new_url = strdup(redirection_string);
}
+ }
- rsp->status = strdup("302 Local Redirect from Junkbuster");
- enlist_unique_header(rsp->headers, "Location", q);
+#ifdef FEATURE_FAST_REDIRECTS
+ if ((csp->action->flags & ACTION_FAST_REDIRECTS))
+ {
+ redirect_mode = csp->action->string[ACTION_STRING_FAST_REDIRECTS];
- return(finish_http_response(rsp));
+ /*
+ * If it exists, use the previously rewritten URL as input
+ * otherwise just use the old path.
+ */
+ old_url = (new_url != NULL) ? new_url : strdup(csp->http->path);
+ new_url = get_last_url(old_url, redirect_mode);
+ freez(old_url);
}
- else
+
+ /*
+ * Disable redirect checkers, so that they
+ * will be only run more than once if the user
+ * also enables them through tags.
+ *
+ * From a performance point of view
+ * it doesn't matter, but the duplicated
+ * log messages are annoying.
+ */
+ csp->action->flags &= ~ACTION_FAST_REDIRECTS;
+#endif /* def FEATURE_FAST_REDIRECTS */
+ csp->action->flags &= ~ACTION_REDIRECT;
+
+ /* Did any redirect action trigger? */
+ if (new_url)
{
- return(NULL);
+ if (0 == strcmpic(new_url, csp->http->url))
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "New URL \"%s\" and old URL \"%s\" are the same. Redirection loop prevented.",
+ csp->http->url, new_url);
+ freez(new_url);
+ }
+ else
+ {
+ log_error(LOG_LEVEL_REDIRECTS, "New URL is: %s", new_url);
+
+ if (NULL == (rsp = alloc_http_response()))
+ {
+ freez(new_url);
+ return cgi_error_memory();
+ }
+
+ if ( enlist_unique_header(rsp->headers, "Location", new_url)
+ || (NULL == (rsp->status = strdup("302 Local Redirect from Privoxy"))) )
+ {
+ freez(new_url);
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+ rsp->reason = RSP_REASON_REDIRECTED;
+ freez(new_url);
+
+ return finish_http_response(csp, rsp);
+ }
}
+ /* Only reached if no redirect is required */
+ return NULL;
+
}
-#endif /* def FEATURE_FAST_REDIRECTS */
#ifdef FEATURE_IMAGE_BLOCKING
*
* 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.
- *
+ * or, #ifdef FEATURE_IMAGE_DETECT_MSIE, and the browser
+ * is MSIE and not on a Mac, tell from the browser's accept
+ * header.
+ *
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
* otherwise
*
*********************************************************************/
-int is_imageurl(struct client_state *csp)
+int is_imageurl(const 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))
+ char *tmp;
+
+ tmp = get_header_value(csp->headers, "User-Agent:");
+ if (tmp && strstr(tmp, "MSIE") && !strstr(tmp, "Mac_"))
{
- return 0;
+ tmp = get_header_value(csp->headers, "Accept:");
+ if (tmp && strstr(tmp, "image/gif"))
+ {
+ /* Client will accept HTML. If this seems counterintuitive,
+ * blame Microsoft.
+ */
+ return(0);
+ }
+ else
+ {
+ return(1);
+ }
}
#endif /* def FEATURE_IMAGE_DETECT_MSIE */
#endif /* def FEATURE_IMAGE_BLOCKING */
-#ifdef FEATURE_COOKIE_JAR
+#ifdef FEATURE_TRUST
/*********************************************************************
*
* Function : is_untrusted_url
* Returns : 0 => trusted, 1 => untrusted
*
*********************************************************************/
-int is_untrusted_url(struct client_state *csp)
+int is_untrusted_url(const struct client_state *csp)
{
struct file_list *fl;
struct block_spec *b;
- struct url_spec url[1], **tl, *t;
+ struct url_spec **trusted_url;
struct http_request rhttp[1];
- char *p, *h;
+ const char * referer;
+ jb_err err;
/*
* If we don't have a trustlist, we trust everybody
*/
if (((fl = csp->tlist) == NULL) || ((b = fl->f) == NULL))
{
- return(0);
+ return 0;
}
+ memset(rhttp, '\0', sizeof(*rhttp));
/*
* Do we trust the request URL itself?
*/
- *url = dsplit(csp->http->host);
+ for (b = b->next; b ; b = b->next)
+ {
+ if (url_match(b->url, csp->http))
+ {
+ return b->reject;
+ }
+ }
- /* if splitting the domain fails, punt */
- if (url->dbuf == NULL) return(0);
+ if (NULL == (referer = get_header_value(csp->headers, "Referer:")))
+ {
+ /* no referrer was supplied */
+ return 1;
+ }
- memset(rhttp, '\0', sizeof(*rhttp));
- for (b = b->next; b ; b = b->next)
+ /*
+ * If not, do we maybe trust its referrer?
+ */
+ err = parse_http_url(referer, rhttp, REQUIRE_PROTOCOL);
+ if (err)
+ {
+ return 1;
+ }
+
+ for (trusted_url = csp->config->trust_list; *trusted_url != NULL; trusted_url++)
{
- if ((b->url->port == 0) || (b->url->port == csp->http->port))
+ if (url_match(*trusted_url, rhttp))
{
- if ((b->url->domain[0] == '\0') || (domaincmp(b->url, url) == 0))
+ /* if the URL's referrer is from a trusted referrer, then
+ * add the target spec to the trustfile as an unblocked
+ * domain and return 0 (which means it's OK).
+ */
+
+ FILE *fp;
+
+ if (NULL != (fp = fopen(csp->config->trustfile, "a")))
{
- 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
- )
+ char * path;
+ char * path_end;
+ char * new_entry = strdup("~");
+
+ string_append(&new_entry, csp->http->hostport);
+
+ path = csp->http->path;
+ if ( (path[0] == '/')
+ && (path[1] == '~')
+ && ((path_end = strchr(path + 2, '/')) != NULL))
{
- freez(url->dbuf);
- freez(url->dvec);
+ /* since this path points into a user's home space
+ * be sure to include this spec in the trustfile.
+ */
+ long path_len = path_end - path; /* save offset */
+ path = strdup(path); /* Copy string */
+ if (path != NULL)
+ {
+ path_end = path + path_len; /* regenerate ptr to new buffer */
+ *(path_end + 1) = '\0'; /* Truncate path after '/' */
+ }
+ string_join(&new_entry, path);
+ }
- if (b->reject == 0) return(0);
+ /*
+ * Give a reason for generating this entry.
+ */
+ string_append(&new_entry, " # Trusted referrer was: ");
+ string_append(&new_entry, referer);
- return(1);
+ if (new_entry != NULL)
+ {
+ if (-1 == fprintf(fp, "%s\n", new_entry))
+ {
+ log_error(LOG_LEVEL_ERROR, "Failed to append \'%s\' to trustfile \'%s\': %E",
+ new_entry, csp->config->trustfile);
+ }
+ freez(new_entry);
+ }
+ else
+ {
+ /* FIXME: No way to handle out-of memory, so mostly ignoring it */
+ log_error(LOG_LEVEL_ERROR, "Out of memory adding pattern to trust file");
}
+
+ fclose(fp);
+ }
+ else
+ {
+ log_error(LOG_LEVEL_ERROR, "Failed to append new entry for \'%s\' to trustfile \'%s\': %E",
+ csp->http->hostport, csp->config->trustfile);
}
+ return 0;
}
}
- freez(url->dbuf);
- freez(url->dvec);
+ return 1;
+}
+#endif /* def FEATURE_TRUST */
+
+
+/*********************************************************************
+ *
+ * Function : pcrs_filter_response
+ *
+ * Description : Execute all text substitutions from all applying
+ * +filter actions on the text buffer that's been
+ * accumulated in csp->iob->buf.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : a pointer to the (newly allocated) modified buffer.
+ * or NULL if there were no hits or something went wrong
+ *
+ *********************************************************************/
+static char *pcrs_filter_response(struct client_state *csp)
+{
+ int hits=0;
+ size_t size, prev_size;
+
+ char *old = NULL;
+ char *new = NULL;
+ pcrs_job *job;
+
+ struct file_list *fl;
+ struct re_filterfile_spec *b;
+ struct list_entry *filtername;
+
+ int i, found_filters = 0;
+
+ /*
+ * Sanity first
+ */
+ if (csp->iob->cur >= csp->iob->eod)
+ {
+ return(NULL);
+ }
+
+ /*
+ * Need to check the set of re_filterfiles...
+ */
+ for (i = 0; i < MAX_AF_FILES; i++)
+ {
+ fl = csp->rlist[i];
+ if (NULL != fl)
+ {
+ if (NULL != fl->f)
+ {
+ found_filters = 1;
+ break;
+ }
+ }
+ }
+
+ if (0 == found_filters)
+ {
+ log_error(LOG_LEVEL_ERROR, "Inconsistent configuration: "
+ "content filtering enabled, but no content filters available.");
+ return(NULL);
+ }
+
+ size = (size_t)(csp->iob->eod - csp->iob->cur);
+ old = csp->iob->cur;
+
+ for (i = 0; i < MAX_AF_FILES; i++)
+ {
+ fl = csp->rlist[i];
+ if ((NULL == fl) || (NULL == fl->f))
+ {
+ /*
+ * Either there are no filter files
+ * left, or this filter file just
+ * contains no valid filters.
+ *
+ * Continue to be sure we don't miss
+ * valid filter files that are chained
+ * after empty or invalid ones.
+ */
+ continue;
+ }
+ /*
+ * For all applying +filter actions, look if a filter by that
+ * name exists and if yes, execute it's pcrs_joblist on the
+ * buffer.
+ */
+ for (b = fl->f; b; b = b->next)
+ {
+ if (b->type != FT_CONTENT_FILTER)
+ {
+ /* Skip header filters */
+ continue;
+ }
+
+ for (filtername = csp->action->multi[ACTION_MULTI_FILTER]->first;
+ filtername ; filtername = filtername->next)
+ {
+ if (strcmp(b->name, filtername->str) == 0)
+ {
+ int current_hits = 0; /* Number of hits caused by this filter */
+ int job_number = 0; /* Which job we're currently executing */
+ int job_hits = 0; /* How many hits the current job caused */
+ pcrs_job *joblist = b->joblist;
+
+ if (b->dynamic) joblist = compile_dynamic_pcrs_job_list(csp, b);
+
+ if (NULL == joblist)
+ {
+ log_error(LOG_LEVEL_RE_FILTER, "Filter %s has empty joblist. Nothing to do.", b->name);
+ continue;
+ }
+
+ prev_size = size;
+ /* Apply all jobs from the joblist */
+ for (job = joblist; NULL != job; job = job->next)
+ {
+ job_number++;
+ job_hits = pcrs_execute(job, old, size, &new, &size);
+
+ if (job_hits >= 0)
+ {
+ /*
+ * That went well. Continue filtering
+ * and use the result of this job as
+ * input for the next one.
+ */
+ current_hits += job_hits;
+ if (old != csp->iob->cur)
+ {
+ freez(old);
+ }
+ old = new;
+ }
+ else
+ {
+ /*
+ * This job caused an unexpected error. Inform the user
+ * and skip the rest of the jobs in this filter. We could
+ * continue with the next job, but usually the jobs
+ * depend on each other or are similar enough to
+ * fail for the same reason.
+ *
+ * At the moment our pcrs expects the error codes of pcre 3.4,
+ * but newer pcre versions can return additional error codes.
+ * As a result pcrs_strerror()'s error message might be
+ * "Unknown error ...", therefore we print the numerical value
+ * as well.
+ *
+ * XXX: Is this important enough for LOG_LEVEL_ERROR or
+ * should we use LOG_LEVEL_RE_FILTER instead?
+ */
+ log_error(LOG_LEVEL_ERROR, "Skipped filter \'%s\' after job number %u: %s (%d)",
+ b->name, job_number, pcrs_strerror(job_hits), job_hits);
+ break;
+ }
+ }
+
+ if (b->dynamic) pcrs_free_joblist(joblist);
+
+ log_error(LOG_LEVEL_RE_FILTER,
+ "filtering %s%s (size %d) with \'%s\' produced %d hits (new size %d).",
+ csp->http->hostport, csp->http->path, prev_size, b->name, current_hits, size);
+
+ hits += current_hits;
+ }
+ }
+ }
+ }
- if ((csp->referrer == NULL)|| (strlen(csp->referrer) <= 9))
+ /*
+ * If there were no hits, destroy our copy and let
+ * chat() use the original in csp->iob
+ */
+ if (!hits)
+ {
+ freez(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.
+ *
+ *********************************************************************/
+static char *gif_deanimate_response(struct client_state *csp)
+{
+ struct binbuffer *in, *out;
+ char *p;
+ size_t size;
+
+ size = (size_t)(csp->iob->eod - csp->iob->cur);
+
+ 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)");
+ freez(in);
+ buf_free(out);
+ return(NULL);
+ }
+ else
+ {
+ if ((int)size == out->offset)
+ {
+ log_error(LOG_LEVEL_DEANIMATE, "GIF not changed.");
+ }
+ 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;
+ freez(in);
+ freez(out);
+ return(p);
+ }
+
+}
+
+
+/*********************************************************************
+ *
+ * Function : get_filter_function
+ *
+ * Description : Decides which content filter function has
+ * to be applied (if any).
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : The content filter function to run, or
+ * NULL if no content filter is active
+ *
+ *********************************************************************/
+filter_function_ptr get_filter_function(struct client_state *csp)
+{
+ filter_function_ptr filter_function = NULL;
+
+ if ((csp->content_type & CT_TABOO)
+ && !(csp->action->flags & ACTION_FORCE_TEXT_MODE))
+ {
+ return NULL;
+ }
+
+ /*
+ * Are we enabling text mode by force?
+ */
+ if (csp->action->flags & ACTION_FORCE_TEXT_MODE)
+ {
+ /*
+ * Do we really have to?
+ */
+ if (csp->content_type & CT_TEXT)
+ {
+ log_error(LOG_LEVEL_HEADER, "Text mode is already enabled.");
+ }
+ else
+ {
+ csp->content_type |= CT_TEXT;
+ log_error(LOG_LEVEL_HEADER, "Text mode enabled by force. Take cover!");
+ }
+ }
+
+ if (!(csp->content_type & CT_DECLARED))
+ {
+ /*
+ * The server didn't bother to declare a MIME-Type.
+ * Assume it's text that can be filtered.
+ *
+ * This also regulary happens with 304 responses,
+ * therefore logging anything here would cause
+ * too much noise.
+ */
+ csp->content_type |= CT_TEXT;
+ }
+
+ /*
+ * Choose the applying filter function based on
+ * the content type and action settings.
+ */
+ if ((csp->content_type & CT_TEXT) &&
+ (csp->rlist != NULL) &&
+ (!list_is_empty(csp->action->multi[ACTION_MULTI_FILTER])))
+ {
+ filter_function = pcrs_filter_response;
+ }
+ else if ((csp->content_type & CT_GIF) &&
+ (csp->action->flags & ACTION_DEANIMATE))
{
- /* no referrer was supplied */
- return(1);
+ filter_function = gif_deanimate_response;
}
- /* forge a URL from the referrer so we can use
- * convert_url() to parse it into its components.
- */
+ return filter_function;
+}
- 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);
+/*********************************************************************
+ *
+ * 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 = In: Number of bytes to be processed,
+ * Out: Number of bytes after de-chunking.
+ * (undefined in case of errors)
+ *
+ * Returns : JB_ERR_OK for success,
+ * JB_ERR_PARSE otherwise
+ *
+ *********************************************************************/
+static jb_err remove_chunked_transfer_coding(char *buffer, size_t *size)
+{
+ size_t newsize = 0;
+ unsigned int chunksize = 0;
+ char *from_p, *to_p;
+
+ assert(buffer);
+ from_p = to_p = buffer;
- if (rhttp->cmd == NULL)
+ if (sscanf(buffer, "%x", &chunksize) != 1)
{
- return(1);
+ log_error(LOG_LEVEL_ERROR, "Invalid first chunksize while stripping \"chunked\" transfer coding");
+ return JB_ERR_PARSE;
}
-
- /*
- * 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++)
+ while (chunksize > 0U)
{
- if ((t->port == 0) || (t->port == rhttp->port))
+ if (NULL == (from_p = strstr(from_p, "\r\n")))
{
- 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).
- */
+ log_error(LOG_LEVEL_ERROR, "Parse error while stripping \"chunked\" transfer coding");
+ return JB_ERR_PARSE;
+ }
- FILE *fp;
+ if ((newsize += chunksize) >= *size)
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "Chunk size %d exceeds buffer size %d in \"chunked\" transfer coding",
+ chunksize, *size);
+ return JB_ERR_PARSE;
+ }
+ from_p += 2;
- freez(url->dbuf);
- freez(url->dvec);
+ memmove(to_p, from_p, (size_t) chunksize);
+ to_p = buffer + newsize;
+ from_p += chunksize + 2;
- if ((fp = fopen(csp->config->trustfile, "a")))
- {
- h = NULL;
+ if (sscanf(from_p, "%x", &chunksize) != 1)
+ {
+ log_error(LOG_LEVEL_INFO, "Invalid \"chunked\" transfer encoding detected and ignored.");
+ break;
+ }
+ }
+
+ /* XXX: Should get its own loglevel. */
+ log_error(LOG_LEVEL_RE_FILTER, "De-chunking successful. Shrunk from %d to %d", *size, newsize);
- h = strsav(h, "~");
- h = strsav(h, csp->http->hostport);
+ *size = newsize;
- 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, "/");
- }
- }
+ return JB_ERR_OK;
- fprintf(fp, "%s\n", h);
- freez(h);
- fclose(fp);
- }
- return(0);
- }
- }
- }
- }
- return(1);
}
-#endif /* def FEATURE_COOKIE_JAR */
/*********************************************************************
*
- * Function : pcrs_filter_response
+ * Function : prepare_for_filtering
*
- * 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.
+ * Description : If necessary, de-chunks and decompresses
+ * the content so it can get filterd.
*
* 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
- *
+ * Returns : JB_ERR_OK for success,
+ * JB_ERR_PARSE otherwise
+ *
*********************************************************************/
-char *pcrs_filter_response(struct client_state *csp)
+static jb_err prepare_for_filtering(struct client_state *csp)
{
- int hits=0;
- int size = csp->iob->eod - csp->iob->cur;
+ jb_err err = JB_ERR_OK;
- char *old = csp->iob->cur, *new = NULL;
- pcrs_job *job;
-
- struct file_list *fl;
- struct re_filterfile_spec *b;
-
- /* Sanity first ;-) */
- if (size <= 0)
+ /*
+ * If the body has a "chunked" transfer-encoding,
+ * get rid of it, adjusting size and iob->eod
+ */
+ if (csp->flags & CSP_FLAG_CHUNKED)
{
- return(NULL);
- }
+ size_t size = (size_t)(csp->iob->eod - csp->iob->cur);
- if ( ( NULL == (fl = csp->rlist) ) || ( NULL == (b = fl->f) ) )
- {
- log_error(LOG_LEVEL_ERROR, "Unable to get current state of regexp filtering.");
- return(NULL);
+ log_error(LOG_LEVEL_RE_FILTER, "Need to de-chunk first");
+ err = remove_chunked_transfer_coding(csp->iob->cur, &size);
+ if (JB_ERR_OK == err)
+ {
+ csp->iob->eod = csp->iob->cur + size;
+ csp->flags |= CSP_FLAG_MODIFIED;
+ }
+ else
+ {
+ return JB_ERR_PARSE;
+ }
}
- if ( NULL == b->joblist )
+#ifdef FEATURE_ZLIB
+ /*
+ * If the body has a supported transfer-encoding,
+ * decompress it, adjusting size and iob->eod.
+ */
+ if (csp->content_type & (CT_GZIP|CT_DEFLATE))
{
- log_error(LOG_LEVEL_RE_FILTER, "Empty joblist. Nothing to do.");
- return(NULL);
- }
+ if (0 == csp->iob->eod - csp->iob->cur)
+ {
+ /* Nothing left after de-chunking. */
+ return JB_ERR_OK;
+ }
- log_error(LOG_LEVEL_RE_FILTER, "re_filtering %s%s (size %d) ...",
- csp->http->hostport, csp->http->path, size);
+ err = decompress_iob(csp);
- /* 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;
+ if (JB_ERR_OK == err)
+ {
+ csp->flags |= CSP_FLAG_MODIFIED;
+ csp->content_type &= ~CT_TABOO;
+ }
+ else
+ {
+ /*
+ * Unset CT_GZIP and CT_DEFLATE to remember not
+ * to modify the Content-Encoding header later.
+ */
+ csp->content_type &= ~CT_GZIP;
+ csp->content_type &= ~CT_DEFLATE;
+ }
}
+#endif
- log_error(LOG_LEVEL_RE_FILTER, " produced %d hits (new size %d).", hits, size);
-
- csp->content_length = size;
-
- /* fwiw, reset the iob */
- IOB_RESET(csp);
- return(new);
-
+ return err;
}
/*********************************************************************
*
- * Function : gif_deanimate_response
+ * Function : execute_content_filter
*
- * Description : Deanimate the GIF image that has been accumulated in
- * csp->iob->buf and set csp->content_length to the modified
- * size.
+ * Description : Executes a given content filter.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
+ * 2 : content_filter = The filter function to execute
+ *
+ * Returns : Pointer to the modified buffer, or
+ * NULL if filtering failed or wasn't necessary.
*
- * Returns : a pointer to the (newly allocated) modified buffer.
- * or NULL in case something went wrong.
- *
*********************************************************************/
-char *gif_deanimate_response(struct client_state *csp)
+char *execute_content_filter(struct client_state *csp, filter_function_ptr content_filter)
{
- struct binbuffer *in, *out;
- char *p;
- int size = csp->iob->eod - csp->iob->cur;
-
- if ( (NULL == (in = (struct binbuffer *)zalloc(sizeof *in )))
- || (NULL == (out = (struct binbuffer *)zalloc(sizeof *out))) )
+ if (0 == csp->iob->eod - csp->iob->cur)
{
- log_error(LOG_LEVEL_DEANIMATE, "failed! (no mem)");
+ /*
+ * No content (probably status code 301, 302 ...),
+ * no filtering necessary.
+ */
return NULL;
}
- in->buffer = csp->iob->cur;
- in->size = size;
-
- if (gif_deanimate(in, out, strncmp("last", csp->action->string[ACTION_STRING_DEANIMATE], 4)))
+ if (JB_ERR_OK != prepare_for_filtering(csp))
{
- log_error(LOG_LEVEL_DEANIMATE, "failed! (gif parsing)");
- free(in);
- buf_free(out);
- return(NULL);
+ /*
+ * failed to de-chunk or decompress.
+ */
+ return NULL;
}
- else
+
+ if (0 == csp->iob->eod - csp->iob->cur)
{
- log_error(LOG_LEVEL_DEANIMATE, "Success! GIF shrunk from %d bytes to %d.", size, out->offset);
- csp->content_length = out->offset;
- p = out->buffer;
- free(in);
- free(out);
- return(p);
- }
+ /*
+ * Clown alarm: chunked and/or compressed nothing delivered.
+ */
+ return NULL;
+ }
+ return ((*content_filter)(csp));
}
/*********************************************************************
*
- * Function : url_actions
+ * Function : get_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...)
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ * 2 : http = http_request request for blocked URLs
*
* Returns : N/A
*
*********************************************************************/
-void url_actions(struct http_request *http,
- struct client_state *csp)
+void get_url_actions(struct client_state *csp, struct http_request *http)
{
struct file_list *fl;
struct url_actions *b;
+ int i;
init_current_action(csp->action);
- if (((fl = csp->actions_list) == NULL) || ((b = fl->f) == NULL))
+ for (i = 0; i < MAX_AF_FILES; i++)
{
- return;
- }
+ if (((fl = csp->actions_list[i]) == NULL) || ((b = fl->f) == NULL))
+ {
+ return;
+ }
- apply_url_actions(csp->action, http, b);
+ apply_url_actions(csp->action, http, b);
+ }
+ return;
}
* Returns : N/A
*
*********************************************************************/
-void apply_url_actions(struct current_action_spec *action,
- struct http_request *http,
+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 (url_match(b->url, http))
{
- 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);
- }
- }
+ merge_current_action(action, b->action);
}
}
-
- freez(url->dbuf);
- freez(url->dvec);
}
/*********************************************************************
*
- * Function : forward_url
+ * Function : get_forward_override_settings
*
- * Description : Should we forward this to another proxy?
+ * Description : Returns forward settings as specified with the
+ * forward-override{} action. forward-override accepts
+ * forward lines similar to the one used in the
+ * configuration file, but without the URL pattern.
+ *
+ * For example:
+ *
+ * forward / .
+ *
+ * in the configuration file can be replaced with
+ * the action section:
+ *
+ * {+forward-override{forward .}}
+ * /
*
* Parameters :
- * 1 : http = http_request request for current URL
- * 2 : csp = Current client state (buffers, headers, etc...)
+ * 1 : csp = Current client state (buffers, headers, etc...)
*
- * Returns : Pointer to forwarding information.
+ * Returns : Pointer to forwarding structure in case of success.
+ * Invalid syntax is fatal.
*
*********************************************************************/
-const struct forward_spec * forward_url(struct http_request *http,
- struct client_state *csp)
+const static struct forward_spec *get_forward_override_settings(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)
+ const char *forward_override_line = csp->action->string[ACTION_STRING_FORWARD_OVERRIDE];
+ char forward_settings[BUFFER_SIZE];
+ char *http_parent = NULL;
+ /* variable names were chosen for consistency reasons. */
+ struct forward_spec *fwd = NULL;
+ int vec_count;
+ char *vec[3];
+
+ assert(csp->action->flags & ACTION_FORWARD_OVERRIDE);
+ /* Should be enforced by load_one_actions_file() */
+ assert(strlen(forward_override_line) < sizeof(forward_settings) - 1);
+
+ /* Create a copy ssplit can modify */
+ strlcpy(forward_settings, forward_override_line, sizeof(forward_settings));
+
+ if (NULL != csp->fwd)
{
- return(fwd_default);
+ /*
+ * XXX: Currently necessary to prevent memory
+ * leaks when the show-url-info cgi page is visited.
+ */
+ unload_forward_spec(csp->fwd);
}
- *url = dsplit(http->host);
-
- /* if splitting the domain fails, punt */
- if (url->dbuf == NULL)
+ /*
+ * allocate a new forward node, valid only for
+ * the lifetime of this request. Save its location
+ * in csp as well, so sweep() can free it later on.
+ */
+ fwd = csp->fwd = zalloc(sizeof(*fwd));
+ if (NULL == fwd)
{
- return(fwd_default);
+ log_error(LOG_LEVEL_FATAL,
+ "can't allocate memory for forward-override{%s}", forward_override_line);
+ /* Never get here - LOG_LEVEL_FATAL causes program exit */
+ return NULL;
}
- while (fwd != NULL)
+ vec_count = ssplit(forward_settings, " \t", vec, SZ(vec), 1, 1);
+ if ((vec_count == 2) && !strcasecmp(vec[0], "forward"))
+ {
+ fwd->type = SOCKS_NONE;
+
+ /* Parse the parent HTTP proxy host:port */
+ http_parent = vec[1];
+
+ }
+ else if (vec_count == 3)
{
- if ((fwd->url->port == 0) || (fwd->url->port == http->port))
+ char *socks_proxy = NULL;
+
+ if (!strcasecmp(vec[0], "forward-socks4"))
{
- 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->type = SOCKS_4;
+ socks_proxy = vec[1];
}
- fwd = fwd->next;
+ else if (!strcasecmp(vec[0], "forward-socks4a"))
+ {
+ fwd->type = SOCKS_4A;
+ socks_proxy = vec[1];
+ }
+ else if (!strcasecmp(vec[0], "forward-socks5"))
+ {
+ fwd->type = SOCKS_5;
+ socks_proxy = vec[1];
+ }
+
+ if (NULL != socks_proxy)
+ {
+ /* Parse the SOCKS proxy host[:port] */
+ fwd->gateway_port = 1080;
+ parse_forwarder_address(socks_proxy,
+ &fwd->gateway_host, &fwd->gateway_port);
+
+ http_parent = vec[2];
+ }
+ }
+
+ if (NULL == http_parent)
+ {
+ log_error(LOG_LEVEL_FATAL,
+ "Invalid forward-override syntax in: %s", forward_override_line);
+ /* Never get here - LOG_LEVEL_FATAL causes program exit */
+ }
+
+ /* Parse http forwarding settings */
+ if (strcmp(http_parent, ".") != 0)
+ {
+ fwd->forward_port = 8000;
+ parse_forwarder_address(http_parent,
+ &fwd->forward_host, &fwd->forward_port);
}
- freez(url->dbuf);
- freez(url->dvec);
- return(fwd_default);
+ assert (NULL != fwd);
+ log_error(LOG_LEVEL_CONNECT,
+ "Overriding forwarding settings based on \'%s\'", forward_override_line);
+
+ return fwd;
}
/*********************************************************************
*
- * Function : dsplit
+ * Function : forward_url
*
- * 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.
+ * Description : Should we forward this to another proxy?
*
* Parameters :
- * 1 : domain = a URL address
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ * 2 : http = http_request request for current URL
*
- * Returns : url_spec structure populated with dbuf, dcnt and dvec.
+ * Returns : Pointer to forwarding information.
*
*********************************************************************/
-struct url_spec dsplit(char *domain)
+const struct forward_spec *forward_url(struct client_state *csp,
+ const struct http_request *http)
{
- 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;
- }
+ static const struct forward_spec fwd_default[1] = { FORWARD_SPEC_INITIALIZER };
+ struct forward_spec *fwd = csp->config->forward;
- if (domain[0] == '.')
+ if (csp->action->flags & ACTION_FORWARD_OVERRIDE)
{
- ret->unanchored |= ANCHOR_LEFT;
+ return get_forward_override_settings(csp);
}
- 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)
+ if (fwd == NULL)
{
- memset(ret, '\0', sizeof(ret));
- return(*ret);
+ return fwd_default;
}
- /* save a copy of the pointers in dvec */
- size = ret->dcnt * sizeof(*ret->dvec);
-
- if ((ret->dvec = (char **)malloc(size)))
+ while (fwd != NULL)
{
- memcpy(ret->dvec, v, size);
+ if (url_match(fwd->url, http))
+ {
+ return fwd;
+ }
+ fwd = fwd->next;
}
- return(*ret);
-
+ return fwd_default;
}
/*********************************************************************
*
- * Function : simple_domaincmp
+ * Function : direct_response
*
- * 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.
+ * Description : Check if Max-Forwards == 0 for an OPTIONS or TRACE
+ * request and if so, return a HTTP 501 to the client.
*
- * 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).
+ * FIXME: I have a stupid name and I should handle the
+ * requests properly. Still, what we do here is rfc-
+ * compliant, whereas ignoring or forwarding are not.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
*
- * Returns : 0 => domains are equivalent, else no match.
+ * Returns : http_response if , NULL if nonmatch or handler fail
*
*********************************************************************/
-static int simple_domaincmp(char **pv, char **fv, int len)
+struct http_response *direct_response(struct client_state *csp)
{
- int n;
+ struct http_response *rsp;
+ struct list_entry *p;
- for (n = 0; n < len; n++)
+ if ((0 == strcmpic(csp->http->gpc, "trace"))
+ || (0 == strcmpic(csp->http->gpc, "options")))
{
- if (simplematch(pv[n], fv[n]))
+ for (p = csp->headers->first; (p != NULL) ; p = p->next)
{
- return 1;
- }
- }
+ if (!strncmpic("Max-Forwards:", p->str, 13))
+ {
+ unsigned int max_forwards;
+
+ /*
+ * If it's a Max-Forwards value of zero,
+ * we have to intercept the request.
+ */
+ if (1 == sscanf(p->str+12, ": %u", &max_forwards) && max_forwards == 0)
+ {
+ /*
+ * FIXME: We could handle at least TRACE here,
+ * but that would require a verbatim copy of
+ * the request which we don't have anymore
+ */
+ log_error(LOG_LEVEL_HEADER,
+ "Detected header \'%s\' in OPTIONS or TRACE request. Returning 501.",
+ p->str);
- return 0;
+ /* Get mem for response or fail*/
+ if (NULL == (rsp = alloc_http_response()))
+ {
+ return cgi_error_memory();
+ }
+
+ if (NULL == (rsp->status = strdup("501 Not Implemented")))
+ {
+ free_http_response(rsp);
+ return cgi_error_memory();
+ }
+ rsp->is_static = 1;
+ rsp->reason = RSP_REASON_UNSUPPORTED;
+
+ return(finish_http_response(csp, rsp));
+ }
+ }
+ }
+ }
+ return NULL;
}
/*********************************************************************
*
- * Function : domaincmp
+ * Function : content_filters_enabled
*
- * 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().
+ * Description : Checks whether there are any content filters
+ * enabled for the current request.
*
- * Parameters :
- * 1 : pattern = a domain that may contain a '*' as a wildcard.
- * 2 : fqdn = domain name against which the patterns are compared.
+ * Parameters :
+ * 1 : action = Action spec to check.
*
- * Returns : 0 => domains are equivalent, else no match.
+ * Returns : TRUE for yes, FALSE otherwise
*
*********************************************************************/
-int domaincmp(struct url_spec *pattern, struct url_spec *fqdn)
+int content_filters_enabled(const struct current_action_spec *action)
{
- 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;
- }
-
+ return ((action->flags & ACTION_DEANIMATE) ||
+ !list_is_empty(action->multi[ACTION_MULTI_FILTER]));
}
-
/*
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projects / privoxy.git / blobdiff