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1c1d9f1aff
Also, use a single function library-wide for detecting if a given hostname is a numerical IP address. Reported-by: Harry Sintonen Fixes #7146 Closes #7149
143 lines
4.6 KiB
C
143 lines
4.6 KiB
C
/***************************************************************************
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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) 1998 - 2021, 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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***************************************************************************/
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#include "curl_setup.h"
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#if defined(USE_OPENSSL) \
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|| defined(USE_GSKIT) \
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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 "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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/*
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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://tools.ietf.org/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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* NOTE: hostmatch() gets called with copied buffers so that it can modify the
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* contents at will.
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*/
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static int hostmatch(char *hostname, char *pattern)
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{
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const char *pattern_label_end, *pattern_wildcard, *hostname_label_end;
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int wildcard_enabled;
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size_t prefixlen, suffixlen;
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/* normalize pattern and hostname by stripping off trailing dots */
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size_t len = strlen(hostname);
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if(hostname[len-1]=='.')
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hostname[len-1] = 0;
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len = strlen(pattern);
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if(pattern[len-1]=='.')
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pattern[len-1] = 0;
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pattern_wildcard = strchr(pattern, '*');
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if(!pattern_wildcard)
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return strcasecompare(pattern, hostname) ?
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CURL_HOST_MATCH : CURL_HOST_NOMATCH;
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/* detect IP address as hostname and fail the match if so */
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if(Curl_host_is_ipnum(hostname))
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return CURL_HOST_NOMATCH;
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/* We require at least 2 dots in pattern to avoid too wide wildcard
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match. */
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wildcard_enabled = 1;
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pattern_label_end = strchr(pattern, '.');
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if(!pattern_label_end || strchr(pattern_label_end + 1, '.') == NULL ||
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pattern_wildcard > pattern_label_end ||
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strncasecompare(pattern, "xn--", 4)) {
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wildcard_enabled = 0;
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}
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if(!wildcard_enabled)
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return strcasecompare(pattern, hostname) ?
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CURL_HOST_MATCH : CURL_HOST_NOMATCH;
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hostname_label_end = strchr(hostname, '.');
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if(!hostname_label_end ||
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!strcasecompare(pattern_label_end, hostname_label_end))
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return CURL_HOST_NOMATCH;
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/* The wildcard must match at least one character, so the left-most
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label of the hostname is at least as large as the left-most label
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of the pattern. */
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if(hostname_label_end - hostname < pattern_label_end - pattern)
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return CURL_HOST_NOMATCH;
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prefixlen = pattern_wildcard - pattern;
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suffixlen = pattern_label_end - (pattern_wildcard + 1);
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return strncasecompare(pattern, hostname, prefixlen) &&
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strncasecompare(pattern_wildcard + 1, hostname_label_end - suffixlen,
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suffixlen) ?
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CURL_HOST_MATCH : CURL_HOST_NOMATCH;
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}
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int Curl_cert_hostcheck(const char *match_pattern, const char *hostname)
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{
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int res = 0;
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if(!match_pattern || !*match_pattern ||
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!hostname || !*hostname) /* sanity check */
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;
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else {
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char *matchp = strdup(match_pattern);
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if(matchp) {
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char *hostp = strdup(hostname);
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if(hostp) {
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if(hostmatch(hostp, matchp) == CURL_HOST_MATCH)
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res = 1;
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free(hostp);
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}
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free(matchp);
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}
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}
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return res;
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}
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#endif /* OPENSSL, GSKIT or schannel+wince */
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