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urlmatch.c
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/*********************************************************************
*
* File : $Source: /cvsroot/ijbswa/current/urlmatch.c,v $
*
* Purpose : Declares functions to match URLs against URL
* patterns.
*
* Copyright : Written by and Copyright (C) 2001-2014
* the Privoxy team. http://www.privoxy.org/
*
* 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.
*
*********************************************************************/
#include "config.h"
#ifndef _WIN32
#include <stdio.h>
#include <sys/types.h>
#endif
#include <stdlib.h>
#include <ctype.h>
#include <assert.h>
#include <string.h>
#if !defined(_WIN32) && !defined(__OS2__)
#include <unistd.h>
#endif
#include "project.h"
#include "urlmatch.h"
#include "ssplit.h"
#include "miscutil.h"
#include "errlog.h"
enum regex_anchoring
{
NO_ANCHORING,
LEFT_ANCHORED,
RIGHT_ANCHORED,
RIGHT_ANCHORED_HOST
};
static jb_err compile_host_pattern(struct pattern_spec *url, const char *host_pattern);
/*********************************************************************
*
* Function : free_http_request
*
* Description : Freez a http_request structure
*
* Parameters :
* 1 : http = points to a http_request structure to free
*
* Returns : N/A
*
*********************************************************************/
void free_http_request(struct http_request *http)
{
assert(http);
freez(http->cmd);
freez(http->ocmd);
freez(http->gpc);
freez(http->host);
freez(http->url);
freez(http->hostport);
freez(http->path);
freez(http->ver);
freez(http->host_ip_addr_str);
#ifndef FEATURE_EXTENDED_HOST_PATTERNS
freez(http->dbuffer);
freez(http->dvec);
http->dcount = 0;
#endif
}
#ifndef FEATURE_EXTENDED_HOST_PATTERNS
/*********************************************************************
*
* Function : init_domain_components
*
* Description : Splits the domain name so we can compare it
* against wildcards. It used to be part of
* parse_http_url, but was separated because the
* same code is required in chat in case of
* intercepted requests.
*
* Parameters :
* 1 : http = pointer to the http structure to hold elements.
*
* Returns : JB_ERR_OK on success
* JB_ERR_PARSE on malformed command/URL
* or >100 domains deep.
*
*********************************************************************/
jb_err init_domain_components(struct http_request *http)
{
char *vec[BUFFER_SIZE];
size_t size;
char *p;
http->dbuffer = strdup_or_die(http->host);
/* map to lower case */
for (p = http->dbuffer; *p ; p++)
{
*p = (char)privoxy_tolower(*p);
}
/* split the domain name into components */
http->dcount = ssplit(http->dbuffer, ".", vec, SZ(vec));
if (http->dcount <= 0)
{
/*
* Error: More than SZ(vec) components in domain
* or: no components in domain
*/
log_error(LOG_LEVEL_ERROR, "More than SZ(vec) components in domain or none at all.");
return JB_ERR_PARSE;
}
/* save a copy of the pointers in dvec */
size = (size_t)http->dcount * sizeof(*http->dvec);
http->dvec = malloc_or_die(size);
memcpy(http->dvec, vec, size);
return JB_ERR_OK;
}
#endif /* ndef FEATURE_EXTENDED_HOST_PATTERNS */
/*********************************************************************
*
* Function : url_requires_percent_encoding
*
* Description : Checks if an URL contains invalid characters
* according to RFC 3986 that should be percent-encoded.
* Does not verify whether or not the passed string
* actually is a valid URL.
*
* Parameters :
* 1 : url = URL to check
*
* Returns : True in case of valid URLs, false otherwise
*
*********************************************************************/
int url_requires_percent_encoding(const char *url)
{
static const char allowed_characters[128] = {
'\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
'\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
'\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
'\0', '\0', '\0', '!', '\0', '#', '$', '%', '&', '\'',
'(', ')', '*', '+', ',', '-', '.', '/', '0', '1',
'2', '3', '4', '5', '6', '7', '8', '9', ':', ';',
'\0', '=', '\0', '?', '@', 'A', 'B', 'C', 'D', 'E',
'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y',
'Z', '[', '\0', ']', '\0', '_', '\0', 'a', 'b', 'c',
'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
'x', 'y', 'z', '\0', '\0', '\0', '~', '\0'
};
while (*url != '\0')
{
const unsigned int i = (unsigned char)*url++;
if (i >= sizeof(allowed_characters) || '\0' == allowed_characters[i])
{
return TRUE;
}
}
return FALSE;
}
/*********************************************************************
*
* Function : parse_http_url
*
* Description : Parse out the host and port from the URL. Find the
* hostname & path, port (if ':'), and/or password (if '@')
*
* Parameters :
* 1 : url = URL (or is it URI?) to break down
* 2 : http = pointer to the http structure to hold elements.
* Must be initialized with valid values (like NULLs).
* 3 : require_protocol = Whether or not URLs without
* protocol are acceptable.
*
* Returns : JB_ERR_OK on success
* JB_ERR_PARSE on malformed command/URL
* or >100 domains deep.
*
*********************************************************************/
jb_err parse_http_url(const char *url, struct http_request *http, int require_protocol)
{
int host_available = 1; /* A proxy can dream. */
/*
* Save our initial URL
*/
http->url = strdup_or_die(url);
/*
* Check for * URI. If found, we're done.
*/
if (*http->url == '*')
{
http->path = strdup_or_die("*");
http->hostport = strdup_or_die("");
if (http->url[1] != '\0')
{
return JB_ERR_PARSE;
}
return JB_ERR_OK;
}
/*
* Split URL into protocol,hostport,path.
*/
{
char *buf;
char *url_noproto;
char *url_path;
buf = strdup_or_die(url);
/* Find the start of the URL in our scratch space */
url_noproto = buf;
if (strncmpic(url_noproto, "http://", 7) == 0)
{
url_noproto += 7;
}
else if (strncmpic(url_noproto, "https://", 8) == 0)
{
/*
* Should only happen when called from cgi_show_url_info().
*/
url_noproto += 8;
http->ssl = 1;
}
else if (*url_noproto == '/')
{
/*
* Short request line without protocol and host.
* Most likely because the client's request
* was intercepted and redirected into Privoxy.
*/
http->host = NULL;
host_available = 0;
}
else if (require_protocol)
{
freez(buf);
return JB_ERR_PARSE;
}
url_path = strchr(url_noproto, '/');
if (url_path != NULL)
{
/*
* Got a path.
*
* NOTE: The following line ignores the path for HTTPS URLS.
* This means that you get consistent behaviour if you type a
* https URL in and it's parsed by the function. (When the
* URL is actually retrieved, SSL hides the path part).
*/
http->path = strdup_or_die(http->ssl ? "/" : url_path);
*url_path = '\0';
http->hostport = strdup_or_die(url_noproto);
}
else
{
/*
* Repair broken HTTP requests that don't contain a path,
* or CONNECT requests
*/
http->path = strdup_or_die("/");
http->hostport = strdup_or_die(url_noproto);
}
freez(buf);
}
if (!host_available)
{
/* Without host, there is nothing left to do here */
return JB_ERR_OK;
}
/*
* Split hostport into user/password (ignored), host, port.
*/
{
char *buf;
char *host;
char *port;
buf = strdup_or_die(http->hostport);
/* check if url contains username and/or password */
host = strchr(buf, '@');
if (host != NULL)
{
/* Contains username/password, skip it and the @ sign. */
host++;
}
else
{
/* No username or password. */
host = buf;
}
/* Move after hostname before port number */
if (*host == '[')
{
/* Numeric IPv6 address delimited by brackets */
host++;
port = strchr(host, ']');
if (port == NULL)
{
/* Missing closing bracket */
freez(buf);
return JB_ERR_PARSE;
}
*port++ = '\0';
if (*port == '\0')
{
port = NULL;
}
else if (*port != ':')
{
/* Garbage after closing bracket */
freez(buf);
return JB_ERR_PARSE;
}
}
else
{
/* Plain non-escaped hostname */
port = strchr(host, ':');
}
/* check if url contains port */
if (port != NULL)
{
/* Contains port */
char *endptr;
long parsed_port;
/* Terminate hostname and point to start of port string */
*port++ = '\0';
parsed_port = strtol(port, &endptr, 10);
if ((parsed_port <= 0) || (parsed_port > 65535) || (*endptr != '\0'))
{
log_error(LOG_LEVEL_ERROR, "Invalid port in URL: %s.", url);
freez(buf);
return JB_ERR_PARSE;
}
http->port = (int)parsed_port;
}
else
{
/* No port specified. */
http->port = (http->ssl ? 443 : 80);
}
http->host = strdup_or_die(host);
freez(buf);
}
#ifdef FEATURE_EXTENDED_HOST_PATTERNS
return JB_ERR_OK;
#else
/* Split domain name so we can compare it against wildcards */
return init_domain_components(http);
#endif /* def FEATURE_EXTENDED_HOST_PATTERNS */
}
/*********************************************************************
*
* Function : unknown_method
*
* Description : Checks whether a method is unknown.
*
* Parameters :
* 1 : method = points to a http method
*
* Returns : TRUE if it's unknown, FALSE otherwise.
*
*********************************************************************/
static int unknown_method(const char *method)
{
static const char * const known_http_methods[] = {
/* Basic HTTP request type */
"GET", "HEAD", "POST", "PUT", "DELETE", "OPTIONS", "TRACE", "CONNECT",
/* webDAV extensions (RFC2518) */
"PROPFIND", "PROPPATCH", "MOVE", "COPY", "MKCOL", "LOCK", "UNLOCK",
/*
* Microsoft webDAV extension for Exchange 2000. See:
* http://lists.w3.org/Archives/Public/w3c-dist-auth/2002JanMar/0001.html
* http://msdn.microsoft.com/library/en-us/wss/wss/_webdav_methods.asp
*/
"BCOPY", "BMOVE", "BDELETE", "BPROPFIND", "BPROPPATCH",
/*
* Another Microsoft webDAV extension for Exchange 2000. See:
* http://systems.cs.colorado.edu/grunwald/MobileComputing/Papers/draft-cohen-gena-p-base-00.txt
* http://lists.w3.org/Archives/Public/w3c-dist-auth/2002JanMar/0001.html
* http://msdn.microsoft.com/library/en-us/wss/wss/_webdav_methods.asp
*/
"SUBSCRIBE", "UNSUBSCRIBE", "NOTIFY", "POLL",
/*
* Yet another WebDAV extension, this time for
* Web Distributed Authoring and Versioning (RFC3253)
*/
"VERSION-CONTROL", "REPORT", "CHECKOUT", "CHECKIN", "UNCHECKOUT",
"MKWORKSPACE", "UPDATE", "LABEL", "MERGE", "BASELINE-CONTROL", "MKACTIVITY",
/*
* The PATCH method is defined by RFC5789, the format of the
* actual patch in the body depends on the application, but from
* Privoxy's point of view it doesn't matter.
*/
"PATCH",
};
int i;
for (i = 0; i < SZ(known_http_methods); i++)
{
if (0 == strcmpic(method, known_http_methods[i]))
{
return FALSE;
}
}
return TRUE;
}
/*********************************************************************
*
* Function : normalize_http_version
*
* Description : Take a supported HTTP version string and remove
* leading zeroes etc., reject unsupported versions.
*
* This is an explicit RFC 2616 (3.1) MUST and
* RFC 7230 mandates that intermediaries send their
* own HTTP-version in forwarded messages.
*
* Parameters :
* 1 : http_version = HTTP version string
*
* Returns : JB_ERR_OK on success
* JB_ERR_PARSE if the HTTP version is unsupported
*
*********************************************************************/
static jb_err normalize_http_version(char *http_version)
{
unsigned int major_version;
unsigned int minor_version;
if (2 != sscanf(http_version, "HTTP/%u.%u", &major_version, &minor_version))
{
log_error(LOG_LEVEL_ERROR, "Unsupported HTTP version: %s", http_version);
return JB_ERR_PARSE;
}
if (major_version != 1 || (minor_version != 0 && minor_version != 1))
{
log_error(LOG_LEVEL_ERROR, "The only supported HTTP "
"versions are 1.0 and 1.1. This rules out: %s", http_version);
return JB_ERR_PARSE;
}
assert(strlen(http_version) >= 8);
snprintf(http_version, 9, "HTTP/%u.%u", major_version, minor_version);
return JB_ERR_OK;
}
/*********************************************************************
*
* Function : parse_http_request
*
* Description : Parse out the host and port from the URL. Find the
* hostname & path, port (if ':'), and/or password (if '@')
*
* Parameters :
* 1 : req = HTTP request line to break down
* 2 : http = pointer to the http structure to hold elements
*
* Returns : JB_ERR_OK on success
* JB_ERR_CGI_PARAMS on malformed command/URL
* or >100 domains deep.
*
*********************************************************************/
jb_err parse_http_request(const char *req, struct http_request *http)
{
char *buf;
char *v[3];
int n;
jb_err err;
memset(http, '\0', sizeof(*http));
buf = strdup_or_die(req);
n = ssplit(buf, " \r\n", v, SZ(v));
if (n != 3)
{
freez(buf);
return JB_ERR_PARSE;
}
/*
* Fail in case of unknown methods
* which we might not handle correctly.
*
* XXX: There should be a config option
* to forward requests with unknown methods
* anyway. Most of them don't need special
* steps.
*/
if (unknown_method(v[0]))
{
log_error(LOG_LEVEL_ERROR, "Unknown HTTP method detected: %s", v[0]);
freez(buf);
return JB_ERR_PARSE;
}
if (JB_ERR_OK != normalize_http_version(v[2]))
{
freez(buf);
return JB_ERR_PARSE;
}
http->ssl = !strcmpic(v[0], "CONNECT");
err = parse_http_url(v[1], http, !http->ssl);
if (err)
{
freez(buf);
return err;
}
/*
* Copy the details into the structure
*/
http->cmd = strdup_or_die(req);
http->gpc = strdup_or_die(v[0]);
http->ver = strdup_or_die(v[2]);
http->ocmd = strdup_or_die(http->cmd);
freez(buf);
return JB_ERR_OK;
}
/*********************************************************************
*
* Function : compile_pattern
*
* Description : Compiles a host, domain or TAG pattern.
*
* Parameters :
* 1 : pattern = The pattern to compile.
* 2 : anchoring = How the regex should be modified
* before compilation. Can be either
* one of NO_ANCHORING, LEFT_ANCHORED,
* RIGHT_ANCHORED or RIGHT_ANCHORED_HOST.
* 3 : url = In case of failures, the spec member is
* logged and the structure freed.
* 4 : regex = Where the compiled regex should be stored.
*
* Returns : JB_ERR_OK - Success
* JB_ERR_PARSE - Cannot parse regex
*
*********************************************************************/
static jb_err compile_pattern(const char *pattern, enum regex_anchoring anchoring,
struct pattern_spec *url, regex_t **regex)
{
int errcode;
const char *fmt = NULL;
char *rebuf;
size_t rebuf_size;
assert(pattern);
if (pattern[0] == '\0')
{
*regex = NULL;
return JB_ERR_OK;
}
switch (anchoring)
{
case NO_ANCHORING:
fmt = "%s";
break;
case RIGHT_ANCHORED:
fmt = "%s$";
break;
case RIGHT_ANCHORED_HOST:
fmt = "%s\\.?$";
break;
case LEFT_ANCHORED:
fmt = "^%s";
break;
default:
log_error(LOG_LEVEL_FATAL,
"Invalid anchoring in compile_pattern %d", anchoring);
}
rebuf_size = strlen(pattern) + strlen(fmt);
rebuf = malloc_or_die(rebuf_size);
*regex = zalloc_or_die(sizeof(**regex));
snprintf(rebuf, rebuf_size, fmt, pattern);
errcode = regcomp(*regex, rebuf, (REG_EXTENDED|REG_NOSUB|REG_ICASE));
if (errcode)
{
size_t errlen = regerror(errcode, *regex, rebuf, rebuf_size);
if (errlen > (rebuf_size - (size_t)1))
{
errlen = rebuf_size - (size_t)1;
}
rebuf[errlen] = '\0';
log_error(LOG_LEVEL_ERROR, "error compiling %s from %s: %s",
pattern, url->spec, rebuf);
free_pattern_spec(url);
freez(rebuf);
return JB_ERR_PARSE;
}
freez(rebuf);
return JB_ERR_OK;
}
/*********************************************************************
*
* Function : compile_url_pattern
*
* Description : Compiles the three parts of an URL pattern.
*
* Parameters :
* 1 : url = Target pattern_spec to be filled in.
* 2 : buf = The url pattern to compile. Will be messed up.
*
* Returns : JB_ERR_OK - Success
* JB_ERR_MEMORY - Out of memory
* JB_ERR_PARSE - Cannot parse regex
*
*********************************************************************/
static jb_err compile_url_pattern(struct pattern_spec *url, char *buf)
{
char *p;
p = strchr(buf, '/');
if (NULL != p)
{
/*
* Only compile the regex if it consists of more than
* a single slash, otherwise it wouldn't affect the result.
*/
if (p[1] != '\0')
{
/*
* XXX: does it make sense to compile the slash at the beginning?
*/
jb_err err = compile_pattern(p, LEFT_ANCHORED, url, &url->pattern.url_spec.preg);
if (JB_ERR_OK != err)
{
return err;
}
}
*p = '\0';
}
/*
* IPv6 numeric hostnames can contain colons, thus we need
* to delimit the hostname before the real port separator.
* As brackets are already used in the hostname pattern,
* we use angle brackets ('<', '>') instead.
*/
if ((buf[0] == '<') && (NULL != (p = strchr(buf + 1, '>'))))
{
*p++ = '\0';
buf++;
if (*p == '\0')
{
/* IPv6 address without port number */
p = NULL;
}
else if (*p != ':')
{
/* Garbage after address delimiter */
return JB_ERR_PARSE;
}
}
else
{
p = strchr(buf, ':');
}
if (NULL != p)
{
*p++ = '\0';
url->pattern.url_spec.port_list = strdup_or_die(p);
}
else
{
url->pattern.url_spec.port_list = NULL;
}
if (buf[0] != '\0')
{
return compile_host_pattern(url, buf);
}
return JB_ERR_OK;
}
#ifdef FEATURE_EXTENDED_HOST_PATTERNS
/*********************************************************************
*
* Function : compile_host_pattern
*
* Description : Parses and compiles a host pattern.
*
* Parameters :
* 1 : url = Target pattern_spec to be filled in.
* 2 : host_pattern = Host pattern to compile.
*
* Returns : JB_ERR_OK - Success
* JB_ERR_MEMORY - Out of memory
* JB_ERR_PARSE - Cannot parse regex
*
*********************************************************************/
static jb_err compile_host_pattern(struct pattern_spec *url, const char *host_pattern)
{
return compile_pattern(host_pattern, RIGHT_ANCHORED_HOST, url, &url->pattern.url_spec.host_regex);
}
#else
/*********************************************************************
*
* Function : compile_host_pattern
*
* Description : Parses and "compiles" an old-school host pattern.
*
* Parameters :
* 1 : url = Target pattern_spec to be filled in.
* 2 : host_pattern = Host pattern to parse.
*
* Returns : JB_ERR_OK - Success
* JB_ERR_PARSE - Cannot parse regex
*
*********************************************************************/
static jb_err compile_host_pattern(struct pattern_spec *url, const char *host_pattern)
{
char *v[150];
size_t size;
char *p;
/*
* Parse domain part
*/
if (host_pattern[strlen(host_pattern) - 1] == '.')
{
url->pattern.url_spec.unanchored |= ANCHOR_RIGHT;
}
if (host_pattern[0] == '.')
{
url->pattern.url_spec.unanchored |= ANCHOR_LEFT;
}
/*
* Split domain into components
*/
url->pattern.url_spec.dbuffer = strdup_or_die(host_pattern);
/*
* Map to lower case
*/
for (p = url->pattern.url_spec.dbuffer; *p ; p++)
{
*p = (char)privoxy_tolower(*p);
}
/*
* Split the domain name into components
*/
url->pattern.url_spec.dcount = ssplit(url->pattern.url_spec.dbuffer, ".", v, SZ(v));
if (url->pattern.url_spec.dcount < 0)
{
free_pattern_spec(url);
return JB_ERR_PARSE;
}
else if (url->pattern.url_spec.dcount != 0)
{
/*
* Save a copy of the pointers in dvec
*/
size = (size_t)url->pattern.url_spec.dcount * sizeof(*url->pattern.url_spec.dvec);
url->pattern.url_spec.dvec = malloc_or_die(size);
memcpy(url->pattern.url_spec.dvec, v, size);
}
/*
* else dcount == 0 in which case we needn't do anything,
* since dvec will never be accessed and the pattern will
* match all domains.
*/
return JB_ERR_OK;
}
/*********************************************************************
*
* Function : simplematch
*
* Description : String matching, with a (greedy) '*' wildcard that
* stands for zero or more arbitrary characters and
* character classes in [], which take both enumerations
* and ranges.
*
* Parameters :
* 1 : pattern = pattern for matching
* 2 : text = text to be matched
*
* Returns : 0 if match, else nonzero
*
*********************************************************************/
static int simplematch(const char *pattern, const char *text)
{
const unsigned char *pat = (const unsigned char *)pattern;
const unsigned char *txt = (const unsigned char *)text;
const unsigned char *fallback = pat;
int wildcard = 0;
unsigned char lastchar = 'a';
unsigned i;
unsigned char charmap[32];
while (*txt)
{
/* EOF pattern but !EOF text? */
if (*pat == '\0')
{
if (wildcard)
{
pat = fallback;
}
else
{
return 1;
}
}
/* '*' in the pattern? */
if (*pat == '*')
{
/* The pattern ends afterwards? Speed up the return. */
if (*++pat == '\0')
{
return 0;
}
/* Else, set wildcard mode and remember position after '*' */
wildcard = 1;
fallback = pat;
}
/* Character range specification? */
if (*pat == '[')
{
memset(charmap, '\0', sizeof(charmap));
while (*++pat != ']')
{
if (!*pat)
{
return 1;
}
else if (*pat == '-')
{
if ((*++pat == ']') || *pat == '\0')
{
return(1);
}
for (i = lastchar; i <= *pat; i++)
{
charmap[i / 8] |= (unsigned char)(1 << (i % 8));
}
}
else
{
charmap[*pat / 8] |= (unsigned char)(1 << (*pat % 8));
lastchar = *pat;
}
}
} /* -END- if Character range specification */
/*
* Char match, or char range match?
*/
if ((*pat == *txt)
|| (*pat == '?')
|| ((*pat == ']') && (charmap[*txt / 8] & (1 << (*txt % 8)))))
{
/*
* Success: Go ahead
*/
pat++;
}
else if (!wildcard)
{
/*
* No match && no wildcard: No luck
*/
return 1;
}
else if (pat != fallback)
{
/*
* Increment text pointer if in char range matching
*/
if (*pat == ']')
{
txt++;
}
/*
* Wildcard mode && nonmatch beyond fallback: Rewind pattern
*/
pat = fallback;
/*
* Restart matching from current text pointer
*/
continue;
}
txt++;
}
/* Cut off extra '*'s */
if (*pat == '*') pat++;