quickjs-tart

quickjs-based runtime for wallet-core logic
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hostcheck.c (4321B)

      1 /***************************************************************************
      2  *                                  _   _ ____  _
      3  *  Project                     ___| | | |  _ \| |
      4  *                             / __| | | | |_) | |
      5  *                            | (__| |_| |  _ <| |___
      6  *                             \___|\___/|_| \_\_____|
      7  *
      8  * Copyright (C) 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.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  * SPDX-License-Identifier: curl
     22  *
     23  ***************************************************************************/
     24 
     25 #include "../curl_setup.h"
     26 
     27 #if defined(USE_OPENSSL)                        \
     28   || defined(USE_SCHANNEL)
     29 /* these backends use functions from this file */
     30 
     31 #ifdef HAVE_NETINET_IN_H
     32 #include <netinet/in.h>
     33 #endif
     34 #ifdef HAVE_NETINET_IN6_H
     35 #include <netinet/in6.h>
     36 #endif
     37 #include "../curl_memrchr.h"
     38 #include "hostcheck.h"
     39 #include "../hostip.h"
     40 
     41 #include "../curl_memory.h"
     42 /* The last #include file should be: */
     43 #include "../memdebug.h"
     44 
     45 /* check the two input strings with given length, but do not
     46    assume they end in nul-bytes */
     47 static bool pmatch(const char *hostname, size_t hostlen,
     48                    const char *pattern, size_t patternlen)
     49 {
     50   if(hostlen != patternlen)
     51     return FALSE;
     52   return curl_strnequal(hostname, pattern, hostlen);
     53 }
     54 
     55 /*
     56  * Match a hostname against a wildcard pattern.
     57  * E.g.
     58  *  "foo.host.com" matches "*.host.com".
     59  *
     60  * We use the matching rule described in RFC6125, section 6.4.3.
     61  * https://datatracker.ietf.org/doc/html/rfc6125#section-6.4.3
     62  *
     63  * In addition: ignore trailing dots in the hostnames and wildcards, so that
     64  * the names are used normalized. This is what the browsers do.
     65  *
     66  * Do not allow wildcard matching on IP numbers. There are apparently
     67  * certificates being used with an IP address in the CN field, thus making no
     68  * apparent distinction between a name and an IP. We need to detect the use of
     69  * an IP address and not wildcard match on such names.
     70  *
     71  * Only match on "*" being used for the leftmost label, not "a*", "a*b" nor
     72  * "*b".
     73  *
     74  * Return TRUE on a match. FALSE if not.
     75  *
     76  * @unittest: 1397
     77  */
     78 
     79 static bool hostmatch(const char *hostname,
     80                       size_t hostlen,
     81                       const char *pattern,
     82                       size_t patternlen)
     83 {
     84   const char *pattern_label_end;
     85 
     86   DEBUGASSERT(pattern);
     87   DEBUGASSERT(patternlen);
     88   DEBUGASSERT(hostname);
     89   DEBUGASSERT(hostlen);
     90 
     91   /* normalize pattern and hostname by stripping off trailing dots */
     92   if(hostname[hostlen-1]=='.')
     93     hostlen--;
     94   if(pattern[patternlen-1]=='.')
     95     patternlen--;
     96 
     97   if(strncmp(pattern, "*.", 2))
     98     return pmatch(hostname, hostlen, pattern, patternlen);
     99 
    100   /* detect IP address as hostname and fail the match if so */
    101   else if(Curl_host_is_ipnum(hostname))
    102     return FALSE;
    103 
    104   /* We require at least 2 dots in the pattern to avoid too wide wildcard
    105      match. */
    106   pattern_label_end = memchr(pattern, '.', patternlen);
    107   if(!pattern_label_end ||
    108      (memrchr(pattern, '.', patternlen) == pattern_label_end))
    109     return pmatch(hostname, hostlen, pattern, patternlen);
    110   else {
    111     const char *hostname_label_end = memchr(hostname, '.', hostlen);
    112     if(hostname_label_end) {
    113       size_t skiphost = hostname_label_end - hostname;
    114       size_t skiplen = pattern_label_end - pattern;
    115       return pmatch(hostname_label_end, hostlen - skiphost,
    116                     pattern_label_end, patternlen - skiplen);
    117     }
    118   }
    119   return FALSE;
    120 }
    121 
    122 /*
    123  * Curl_cert_hostcheck() returns TRUE if a match and FALSE if not.
    124  */
    125 bool Curl_cert_hostcheck(const char *match, size_t matchlen,
    126                          const char *hostname, size_t hostlen)
    127 {
    128   if(match && *match && hostname && *hostname)
    129     return hostmatch(hostname, hostlen, match, matchlen);
    130   return FALSE;
    131 }
    132 
    133 #endif /* OPENSSL or SCHANNEL */