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