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Diffstat (limited to 'Utilities/cmcurl/lib/vtls/hostcheck.c')
| -rw-r--r-- | Utilities/cmcurl/lib/vtls/hostcheck.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/Utilities/cmcurl/lib/vtls/hostcheck.c b/Utilities/cmcurl/lib/vtls/hostcheck.c new file mode 100644 index 0000000..2726dca --- /dev/null +++ b/Utilities/cmcurl/lib/vtls/hostcheck.c @@ -0,0 +1,135 @@ +/*************************************************************************** + * _ _ ____ _ + * Project ___| | | | _ \| | + * / __| | | | |_) | | + * | (__| |_| | _ <| |___ + * \___|\___/|_| \_\_____| + * + * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. + * + * This software is licensed as described in the file COPYING, which + * you should have received as part of this distribution. The terms + * are also available at https://curl.se/docs/copyright.html. + * + * You may opt to use, copy, modify, merge, publish, distribute and/or sell + * copies of the Software, and permit persons to whom the Software is + * furnished to do so, under the terms of the COPYING file. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + * SPDX-License-Identifier: curl + * + ***************************************************************************/ + +#include "curl_setup.h" + +#if defined(USE_OPENSSL) \ + || defined(USE_SCHANNEL) +/* these backends use functions from this file */ + +#ifdef HAVE_NETINET_IN_H +#include <netinet/in.h> +#endif +#ifdef HAVE_NETINET_IN6_H +#include <netinet/in6.h> +#endif +#include "curl_memrchr.h" + +#include "hostcheck.h" +#include "strcase.h" +#include "hostip.h" + +#include "curl_memory.h" +/* The last #include file should be: */ +#include "memdebug.h" + +/* check the two input strings with given length, but do not + assume they end in nul-bytes */ +static bool pmatch(const char *hostname, size_t hostlen, + const char *pattern, size_t patternlen) +{ + if(hostlen != patternlen) + return FALSE; + return strncasecompare(hostname, pattern, hostlen); +} + +/* + * Match a hostname against a wildcard pattern. + * E.g. + * "foo.host.com" matches "*.host.com". + * + * We use the matching rule described in RFC6125, section 6.4.3. + * https://datatracker.ietf.org/doc/html/rfc6125#section-6.4.3 + * + * In addition: ignore trailing dots in the host names and wildcards, so that + * the names are used normalized. This is what the browsers do. + * + * Do not allow wildcard matching on IP numbers. There are apparently + * certificates being used with an IP address in the CN field, thus making no + * apparent distinction between a name and an IP. We need to detect the use of + * an IP address and not wildcard match on such names. + * + * Only match on "*" being used for the leftmost label, not "a*", "a*b" nor + * "*b". + * + * Return TRUE on a match. FALSE if not. + * + * @unittest: 1397 + */ + +static bool hostmatch(const char *hostname, + size_t hostlen, + const char *pattern, + size_t patternlen) +{ + const char *pattern_label_end; + + DEBUGASSERT(pattern); + DEBUGASSERT(patternlen); + DEBUGASSERT(hostname); + DEBUGASSERT(hostlen); + + /* normalize pattern and hostname by stripping off trailing dots */ + if(hostname[hostlen-1]=='.') + hostlen--; + if(pattern[patternlen-1]=='.') + patternlen--; + + if(strncmp(pattern, "*.", 2)) + return pmatch(hostname, hostlen, pattern, patternlen); + + /* detect IP address as hostname and fail the match if so */ + else if(Curl_host_is_ipnum(hostname)) + return FALSE; + + /* We require at least 2 dots in the pattern to avoid too wide wildcard + match. */ + pattern_label_end = memchr(pattern, '.', patternlen); + if(!pattern_label_end || + (memrchr(pattern, '.', patternlen) == pattern_label_end)) + return pmatch(hostname, hostlen, pattern, patternlen); + else { + const char *hostname_label_end = memchr(hostname, '.', hostlen); + if(hostname_label_end) { + size_t skiphost = hostname_label_end - hostname; + size_t skiplen = pattern_label_end - pattern; + return pmatch(hostname_label_end, hostlen - skiphost, + pattern_label_end, patternlen - skiplen); + } + } + return FALSE; +} + +/* + * Curl_cert_hostcheck() returns TRUE if a match and FALSE if not. + */ +bool Curl_cert_hostcheck(const char *match, size_t matchlen, + const char *hostname, size_t hostlen) +{ + if(match && *match && hostname && *hostname) + return hostmatch(hostname, hostlen, match, matchlen); + return FALSE; +} + +#endif /* OPENSSL or SCHANNEL */ |