[164] | 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) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, 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.haxx.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 | ***************************************************************************/
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| 22 |
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| 23 | #include "curl_setup.h"
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| 24 |
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| 25 | #if defined(USE_OPENSSL) || defined(USE_AXTLS) || defined(USE_GSKIT)
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| 26 | /* these backends use functions from this file */
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| 27 |
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| 28 | #ifdef HAVE_NETINET_IN_H
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| 29 | #include <netinet/in.h>
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| 30 | #endif
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| 31 |
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| 32 | #include "hostcheck.h"
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| 33 | #include "rawstr.h"
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| 34 | #include "inet_pton.h"
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| 35 |
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| 36 | #include "curl_memory.h"
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| 37 | /* The last #include file should be: */
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| 38 | #include "memdebug.h"
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| 39 |
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| 40 | /*
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| 41 | * Match a hostname against a wildcard pattern.
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| 42 | * E.g.
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| 43 | * "foo.host.com" matches "*.host.com".
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| 44 | *
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| 45 | * We use the matching rule described in RFC6125, section 6.4.3.
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| 46 | * https://tools.ietf.org/html/rfc6125#section-6.4.3
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| 47 | *
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| 48 | * In addition: ignore trailing dots in the host names and wildcards, so that
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| 49 | * the names are used normalized. This is what the browsers do.
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| 50 | *
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| 51 | * Do not allow wildcard matching on IP numbers. There are apparently
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| 52 | * certificates being used with an IP address in the CN field, thus making no
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| 53 | * apparent distinction between a name and an IP. We need to detect the use of
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| 54 | * an IP address and not wildcard match on such names.
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| 55 | *
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| 56 | * NOTE: hostmatch() gets called with copied buffers so that it can modify the
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| 57 | * contents at will.
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| 58 | */
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| 59 |
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| 60 | static int hostmatch(char *hostname, char *pattern)
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| 61 | {
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| 62 | const char *pattern_label_end, *pattern_wildcard, *hostname_label_end;
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| 63 | int wildcard_enabled;
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| 64 | size_t prefixlen, suffixlen;
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| 65 | struct in_addr ignored;
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| 66 | #ifdef ENABLE_IPV6
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| 67 | struct sockaddr_in6 si6;
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| 68 | #endif
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| 69 |
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| 70 | /* normalize pattern and hostname by stripping off trailing dots */
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| 71 | size_t len = strlen(hostname);
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| 72 | if(hostname[len-1]=='.')
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| 73 | hostname[len-1]=0;
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| 74 | len = strlen(pattern);
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| 75 | if(pattern[len-1]=='.')
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| 76 | pattern[len-1]=0;
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| 77 |
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| 78 | pattern_wildcard = strchr(pattern, '*');
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| 79 | if(pattern_wildcard == NULL)
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| 80 | return Curl_raw_equal(pattern, hostname) ?
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| 81 | CURL_HOST_MATCH : CURL_HOST_NOMATCH;
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| 82 |
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| 83 | /* detect IP address as hostname and fail the match if so */
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| 84 | if(Curl_inet_pton(AF_INET, hostname, &ignored) > 0)
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| 85 | return CURL_HOST_NOMATCH;
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| 86 | #ifdef ENABLE_IPV6
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| 87 | else if(Curl_inet_pton(AF_INET6, hostname, &si6.sin6_addr) > 0)
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| 88 | return CURL_HOST_NOMATCH;
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| 89 | #endif
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| 90 |
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| 91 | /* We require at least 2 dots in pattern to avoid too wide wildcard
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| 92 | match. */
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| 93 | wildcard_enabled = 1;
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| 94 | pattern_label_end = strchr(pattern, '.');
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| 95 | if(pattern_label_end == NULL || strchr(pattern_label_end+1, '.') == NULL ||
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| 96 | pattern_wildcard > pattern_label_end ||
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| 97 | Curl_raw_nequal(pattern, "xn--", 4)) {
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| 98 | wildcard_enabled = 0;
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| 99 | }
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| 100 | if(!wildcard_enabled)
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| 101 | return Curl_raw_equal(pattern, hostname) ?
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| 102 | CURL_HOST_MATCH : CURL_HOST_NOMATCH;
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| 103 |
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| 104 | hostname_label_end = strchr(hostname, '.');
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| 105 | if(hostname_label_end == NULL ||
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| 106 | !Curl_raw_equal(pattern_label_end, hostname_label_end))
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| 107 | return CURL_HOST_NOMATCH;
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| 108 |
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| 109 | /* The wildcard must match at least one character, so the left-most
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| 110 | label of the hostname is at least as large as the left-most label
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| 111 | of the pattern. */
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| 112 | if(hostname_label_end - hostname < pattern_label_end - pattern)
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| 113 | return CURL_HOST_NOMATCH;
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| 114 |
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| 115 | prefixlen = pattern_wildcard - pattern;
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| 116 | suffixlen = pattern_label_end - (pattern_wildcard+1);
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| 117 | return Curl_raw_nequal(pattern, hostname, prefixlen) &&
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| 118 | Curl_raw_nequal(pattern_wildcard+1, hostname_label_end - suffixlen,
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| 119 | suffixlen) ?
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| 120 | CURL_HOST_MATCH : CURL_HOST_NOMATCH;
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| 121 | }
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| 122 |
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| 123 | int Curl_cert_hostcheck(const char *match_pattern, const char *hostname)
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| 124 | {
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| 125 | char *matchp;
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| 126 | char *hostp;
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| 127 | int res = 0;
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| 128 | if(!match_pattern || !*match_pattern ||
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| 129 | !hostname || !*hostname) /* sanity check */
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| 130 | ;
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| 131 | else {
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| 132 | matchp = strdup(match_pattern);
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| 133 | if(matchp) {
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| 134 | hostp = strdup(hostname);
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| 135 | if(hostp) {
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| 136 | if(hostmatch(hostp, matchp) == CURL_HOST_MATCH)
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| 137 | res= 1;
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| 138 | free(hostp);
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| 139 | }
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| 140 | free(matchp);
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| 141 | }
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| 142 | }
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| 143 |
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| 144 | return res;
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| 145 | }
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| 146 |
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| 147 | #endif /* OPENSSL or AXTLS or GSKIT */
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