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Annotation of embedaddon/curl/lib/hostcheck.c, revision 1.1.1.1

1.1       misho       1: /***************************************************************************
                      2:  *                                  _   _ ____  _
                      3:  *  Project                     ___| | | |  _ \| |
                      4:  *                             / __| | | | |_) | |
                      5:  *                            | (__| |_| |  _ <| |___
                      6:  *                             \___|\___/|_| \_\_____|
                      7:  *
                      8:  * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
                      9:  *
                     10:  * This software is licensed as described in the file COPYING, which
                     11:  * you should have received as part of this distribution. The terms
                     12:  * are also available at https://curl.haxx.se/docs/copyright.html.
                     13:  *
                     14:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
                     15:  * copies of the Software, and permit persons to whom the Software is
                     16:  * furnished to do so, under the terms of the COPYING file.
                     17:  *
                     18:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
                     19:  * KIND, either express or implied.
                     20:  *
                     21:  ***************************************************************************/
                     22: 
                     23: #include "curl_setup.h"
                     24: 
                     25: #if defined(USE_OPENSSL)                                \
                     26:   || defined(USE_GSKIT)                                 \
                     27:   || defined(USE_SCHANNEL)
                     28: /* these backends use functions from this file */
                     29: 
                     30: #ifdef HAVE_NETINET_IN_H
                     31: #include <netinet/in.h>
                     32: #endif
                     33: #ifdef HAVE_NETINET_IN6_H
                     34: #include <netinet/in6.h>
                     35: #endif
                     36: 
                     37: #include "hostcheck.h"
                     38: #include "strcase.h"
                     39: #include "inet_pton.h"
                     40: 
                     41: #include "curl_memory.h"
                     42: /* The last #include file should be: */
                     43: #include "memdebug.h"
                     44: 
                     45: /*
                     46:  * Match a hostname against a wildcard pattern.
                     47:  * E.g.
                     48:  *  "foo.host.com" matches "*.host.com".
                     49:  *
                     50:  * We use the matching rule described in RFC6125, section 6.4.3.
                     51:  * https://tools.ietf.org/html/rfc6125#section-6.4.3
                     52:  *
                     53:  * In addition: ignore trailing dots in the host names and wildcards, so that
                     54:  * the names are used normalized. This is what the browsers do.
                     55:  *
                     56:  * Do not allow wildcard matching on IP numbers. There are apparently
                     57:  * certificates being used with an IP address in the CN field, thus making no
                     58:  * apparent distinction between a name and an IP. We need to detect the use of
                     59:  * an IP address and not wildcard match on such names.
                     60:  *
                     61:  * NOTE: hostmatch() gets called with copied buffers so that it can modify the
                     62:  * contents at will.
                     63:  */
                     64: 
                     65: static int hostmatch(char *hostname, char *pattern)
                     66: {
                     67:   const char *pattern_label_end, *pattern_wildcard, *hostname_label_end;
                     68:   int wildcard_enabled;
                     69:   size_t prefixlen, suffixlen;
                     70:   struct in_addr ignored;
                     71: #ifdef ENABLE_IPV6
                     72:   struct sockaddr_in6 si6;
                     73: #endif
                     74: 
                     75:   /* normalize pattern and hostname by stripping off trailing dots */
                     76:   size_t len = strlen(hostname);
                     77:   if(hostname[len-1]=='.')
                     78:     hostname[len-1] = 0;
                     79:   len = strlen(pattern);
                     80:   if(pattern[len-1]=='.')
                     81:     pattern[len-1] = 0;
                     82: 
                     83:   pattern_wildcard = strchr(pattern, '*');
                     84:   if(pattern_wildcard == NULL)
                     85:     return strcasecompare(pattern, hostname) ?
                     86:       CURL_HOST_MATCH : CURL_HOST_NOMATCH;
                     87: 
                     88:   /* detect IP address as hostname and fail the match if so */
                     89:   if(Curl_inet_pton(AF_INET, hostname, &ignored) > 0)
                     90:     return CURL_HOST_NOMATCH;
                     91: #ifdef ENABLE_IPV6
                     92:   if(Curl_inet_pton(AF_INET6, hostname, &si6.sin6_addr) > 0)
                     93:     return CURL_HOST_NOMATCH;
                     94: #endif
                     95: 
                     96:   /* We require at least 2 dots in pattern to avoid too wide wildcard
                     97:      match. */
                     98:   wildcard_enabled = 1;
                     99:   pattern_label_end = strchr(pattern, '.');
                    100:   if(pattern_label_end == NULL || strchr(pattern_label_end + 1, '.') == NULL ||
                    101:      pattern_wildcard > pattern_label_end ||
                    102:      strncasecompare(pattern, "xn--", 4)) {
                    103:     wildcard_enabled = 0;
                    104:   }
                    105:   if(!wildcard_enabled)
                    106:     return strcasecompare(pattern, hostname) ?
                    107:       CURL_HOST_MATCH : CURL_HOST_NOMATCH;
                    108: 
                    109:   hostname_label_end = strchr(hostname, '.');
                    110:   if(hostname_label_end == NULL ||
                    111:      !strcasecompare(pattern_label_end, hostname_label_end))
                    112:     return CURL_HOST_NOMATCH;
                    113: 
                    114:   /* The wildcard must match at least one character, so the left-most
                    115:      label of the hostname is at least as large as the left-most label
                    116:      of the pattern. */
                    117:   if(hostname_label_end - hostname < pattern_label_end - pattern)
                    118:     return CURL_HOST_NOMATCH;
                    119: 
                    120:   prefixlen = pattern_wildcard - pattern;
                    121:   suffixlen = pattern_label_end - (pattern_wildcard + 1);
                    122:   return strncasecompare(pattern, hostname, prefixlen) &&
                    123:     strncasecompare(pattern_wildcard + 1, hostname_label_end - suffixlen,
                    124:                     suffixlen) ?
                    125:     CURL_HOST_MATCH : CURL_HOST_NOMATCH;
                    126: }
                    127: 
                    128: int Curl_cert_hostcheck(const char *match_pattern, const char *hostname)
                    129: {
                    130:   int res = 0;
                    131:   if(!match_pattern || !*match_pattern ||
                    132:       !hostname || !*hostname) /* sanity check */
                    133:     ;
                    134:   else {
                    135:     char *matchp = strdup(match_pattern);
                    136:     if(matchp) {
                    137:       char *hostp = strdup(hostname);
                    138:       if(hostp) {
                    139:         if(hostmatch(hostp, matchp) == CURL_HOST_MATCH)
                    140:           res = 1;
                    141:         free(hostp);
                    142:       }
                    143:       free(matchp);
                    144:     }
                    145:   }
                    146: 
                    147:   return res;
                    148: }
                    149: 
                    150: #endif /* OPENSSL, GSKIT or schannel+wince */