| 1 | /***************************************************************************
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| 2 | * _ _ ____ _
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| 3 | * Project ___| | | | _ \| |
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| 4 | * / __| | | | |_) | |
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| 5 | * | (__| |_| | _ <| |___
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| 6 | * \___|\___/|_| \_\_____|
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| 7 | *
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| 8 | * Copyright (C) Daniel Stenberg, <[email protected]>, et al.
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| 9 | *
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| 10 | * This software is licensed as described in the file COPYING, which
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| 11 | * you should have received as part of this distribution. The terms
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| 12 | * are also available at https://curl.se/docs/copyright.html.
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| 13 | *
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| 14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 15 | * copies of the Software, and permit persons to whom the Software is
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| 16 | * furnished to do so, under the terms of the COPYING file.
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| 17 | *
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| 18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 19 | * KIND, either express or implied.
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| 20 | *
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| 21 | * SPDX-License-Identifier: curl
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| 22 | *
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| 23 | ***************************************************************************/
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| 24 |
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| 25 | #include "curl_setup.h"
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| 26 |
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| 27 | #if defined(USE_OPENSSL) \
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| 28 | || defined(USE_SCHANNEL)
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| 29 | /* these backends use functions from this file */
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| 30 |
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| 31 | #ifdef HAVE_NETINET_IN_H
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| 32 | #include <netinet/in.h>
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| 33 | #endif
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| 34 | #ifdef HAVE_NETINET_IN6_H
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| 35 | #include <netinet/in6.h>
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| 36 | #endif
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| 37 | #include "curl_memrchr.h"
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| 38 |
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| 39 | #include "hostcheck.h"
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| 40 | #include "strcase.h"
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| 41 | #include "hostip.h"
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| 42 |
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| 43 | #include "curl_memory.h"
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| 44 | /* The last #include file should be: */
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| 45 | #include "memdebug.h"
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| 46 |
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| 47 | /* check the two input strings with given length, but do not
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| 48 | assume they end in nul-bytes */
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| 49 | static bool pmatch(const char *hostname, size_t hostlen,
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| 50 | const char *pattern, size_t patternlen)
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| 51 | {
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| 52 | if(hostlen != patternlen)
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| 53 | return FALSE;
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| 54 | return strncasecompare(hostname, pattern, hostlen);
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| 55 | }
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| 56 |
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| 57 | /*
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| 58 | * Match a hostname against a wildcard pattern.
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| 59 | * E.g.
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| 60 | * "foo.host.com" matches "*.host.com".
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| 61 | *
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| 62 | * We use the matching rule described in RFC6125, section 6.4.3.
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| 63 | * https://datatracker.ietf.org/doc/html/rfc6125#section-6.4.3
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| 64 | *
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| 65 | * In addition: ignore trailing dots in the host names and wildcards, so that
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| 66 | * the names are used normalized. This is what the browsers do.
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| 67 | *
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| 68 | * Do not allow wildcard matching on IP numbers. There are apparently
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| 69 | * certificates being used with an IP address in the CN field, thus making no
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| 70 | * apparent distinction between a name and an IP. We need to detect the use of
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| 71 | * an IP address and not wildcard match on such names.
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| 72 | *
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| 73 | * Only match on "*" being used for the leftmost label, not "a*", "a*b" nor
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| 74 | * "*b".
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| 75 | *
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| 76 | * Return TRUE on a match. FALSE if not.
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| 77 | *
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| 78 | * @unittest: 1397
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| 79 | */
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| 80 |
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| 81 | static bool hostmatch(const char *hostname,
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| 82 | size_t hostlen,
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| 83 | const char *pattern,
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| 84 | size_t patternlen)
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| 85 | {
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| 86 | const char *pattern_label_end;
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| 87 |
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| 88 | DEBUGASSERT(pattern);
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| 89 | DEBUGASSERT(patternlen);
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| 90 | DEBUGASSERT(hostname);
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| 91 | DEBUGASSERT(hostlen);
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| 92 |
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| 93 | /* normalize pattern and hostname by stripping off trailing dots */
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| 94 | if(hostname[hostlen-1]=='.')
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| 95 | hostlen--;
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| 96 | if(pattern[patternlen-1]=='.')
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| 97 | patternlen--;
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| 98 |
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| 99 | if(strncmp(pattern, "*.", 2))
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| 100 | return pmatch(hostname, hostlen, pattern, patternlen);
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| 101 |
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| 102 | /* detect IP address as hostname and fail the match if so */
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| 103 | else if(Curl_host_is_ipnum(hostname))
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| 104 | return FALSE;
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| 105 |
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| 106 | /* We require at least 2 dots in the pattern to avoid too wide wildcard
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| 107 | match. */
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| 108 | pattern_label_end = memchr(pattern, '.', patternlen);
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| 109 | if(!pattern_label_end ||
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| 110 | (memrchr(pattern, '.', patternlen) == pattern_label_end))
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| 111 | return pmatch(hostname, hostlen, pattern, patternlen);
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| 112 | else {
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| 113 | const char *hostname_label_end = memchr(hostname, '.', hostlen);
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| 114 | if(hostname_label_end) {
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| 115 | size_t skiphost = hostname_label_end - hostname;
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| 116 | size_t skiplen = pattern_label_end - pattern;
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| 117 | return pmatch(hostname_label_end, hostlen - skiphost,
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| 118 | pattern_label_end, patternlen - skiplen);
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| 119 | }
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| 120 | }
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| 121 | return FALSE;
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| 122 | }
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| 123 |
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| 124 | /*
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| 125 | * Curl_cert_hostcheck() returns TRUE if a match and FALSE if not.
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| 126 | */
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| 127 | bool Curl_cert_hostcheck(const char *match, size_t matchlen,
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| 128 | const char *hostname, size_t hostlen)
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| 129 | {
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| 130 | if(match && *match && hostname && *hostname)
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| 131 | return hostmatch(hostname, hostlen, match, matchlen);
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| 132 | return FALSE;
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| 133 | }
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| 134 |
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| 135 | #endif /* OPENSSL or SCHANNEL */
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