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136 lines
4.2 KiB
136 lines
4.2 KiB
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#if defined(USE_OPENSSL) \
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|| defined(USE_SCHANNEL)
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/* these backends use functions from this file */
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef HAVE_NETINET_IN6_H
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#include <netinet/in6.h>
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#endif
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#include "curl_memrchr.h"
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#include "hostcheck.h"
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#include "strcase.h"
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#include "hostip.h"
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#include "curl_memory.h"
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/* The last #include file should be: */
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#include "memdebug.h"
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/* check the two input strings with given length, but do not
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assume they end in nul-bytes */
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static bool pmatch(const char *hostname, size_t hostlen,
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const char *pattern, size_t patternlen)
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{
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if(hostlen != patternlen)
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return FALSE;
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return strncasecompare(hostname, pattern, hostlen);
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}
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/*
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* Match a hostname against a wildcard pattern.
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* E.g.
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* "foo.host.com" matches "*.host.com".
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*
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* We use the matching rule described in RFC6125, section 6.4.3.
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* https://datatracker.ietf.org/doc/html/rfc6125#section-6.4.3
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*
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* In addition: ignore trailing dots in the host names and wildcards, so that
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* the names are used normalized. This is what the browsers do.
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*
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* Do not allow wildcard matching on IP numbers. There are apparently
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* certificates being used with an IP address in the CN field, thus making no
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* apparent distinction between a name and an IP. We need to detect the use of
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* an IP address and not wildcard match on such names.
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*
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* Only match on "*" being used for the leftmost label, not "a*", "a*b" nor
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* "*b".
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*
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* Return TRUE on a match. FALSE if not.
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*
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* @unittest: 1397
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*/
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static bool hostmatch(const char *hostname,
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size_t hostlen,
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const char *pattern,
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size_t patternlen)
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{
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const char *pattern_label_end;
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DEBUGASSERT(pattern);
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DEBUGASSERT(patternlen);
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DEBUGASSERT(hostname);
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DEBUGASSERT(hostlen);
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/* normalize pattern and hostname by stripping off trailing dots */
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if(hostname[hostlen-1]=='.')
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hostlen--;
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if(pattern[patternlen-1]=='.')
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patternlen--;
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if(strncmp(pattern, "*.", 2))
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return pmatch(hostname, hostlen, pattern, patternlen);
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/* detect IP address as hostname and fail the match if so */
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else if(Curl_host_is_ipnum(hostname))
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return FALSE;
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/* We require at least 2 dots in the pattern to avoid too wide wildcard
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match. */
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pattern_label_end = memchr(pattern, '.', patternlen);
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if(!pattern_label_end ||
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(memrchr(pattern, '.', patternlen) == pattern_label_end))
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return pmatch(hostname, hostlen, pattern, patternlen);
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else {
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const char *hostname_label_end = memchr(hostname, '.', hostlen);
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if(hostname_label_end) {
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size_t skiphost = hostname_label_end - hostname;
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size_t skiplen = pattern_label_end - pattern;
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return pmatch(hostname_label_end, hostlen - skiphost,
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pattern_label_end, patternlen - skiplen);
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}
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}
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return FALSE;
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}
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/*
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* Curl_cert_hostcheck() returns TRUE if a match and FALSE if not.
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*/
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bool Curl_cert_hostcheck(const char *match, size_t matchlen,
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const char *hostname, size_t hostlen)
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{
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if(match && *match && hostname && *hostname)
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return hostmatch(hostname, hostlen, match, matchlen);
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return FALSE;
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}
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#endif /* OPENSSL or SCHANNEL */
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