218 lines
6.5 KiB
C
218 lines
6.5 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 - 2012, 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 http://curl.haxx.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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/* This file is an amalgamation of hostcheck.c and most of rawstr.c
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from cURL. The contents of the COPYING file mentioned above are:
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COPYRIGHT AND PERMISSION NOTICE
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Copyright (c) 1996 - 2013, Daniel Stenberg, <daniel@haxx.se>.
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All rights reserved.
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Permission to use, copy, modify, and distribute this software for any purpose
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with or without fee is hereby granted, provided that the above copyright
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notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN
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NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
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OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of a copyright holder shall not
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be used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization of the copyright holder.
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*/
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#include "hostcheck.h"
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#include <string.h>
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/* Portable, consistent toupper (remember EBCDIC). Do not use toupper() because
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its behavior is altered by the current locale. */
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static char Curl_raw_toupper(char in)
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{
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switch (in) {
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case 'a':
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return 'A';
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case 'b':
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return 'B';
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case 'c':
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return 'C';
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case 'd':
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return 'D';
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case 'e':
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return 'E';
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case 'f':
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return 'F';
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case 'g':
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return 'G';
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case 'h':
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return 'H';
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case 'i':
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return 'I';
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case 'j':
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return 'J';
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case 'k':
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return 'K';
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case 'l':
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return 'L';
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case 'm':
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return 'M';
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case 'n':
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return 'N';
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case 'o':
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return 'O';
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case 'p':
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return 'P';
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case 'q':
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return 'Q';
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case 'r':
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return 'R';
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case 's':
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return 'S';
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case 't':
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return 'T';
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case 'u':
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return 'U';
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case 'v':
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return 'V';
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case 'w':
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return 'W';
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case 'x':
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return 'X';
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case 'y':
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return 'Y';
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case 'z':
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return 'Z';
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}
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return in;
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}
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/*
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* Curl_raw_equal() is for doing "raw" case insensitive strings. This is meant
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* to be locale independent and only compare strings we know are safe for
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* this. See http://daniel.haxx.se/blog/2008/10/15/strcasecmp-in-turkish/ for
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* some further explanation to why this function is necessary.
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*
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* The function is capable of comparing a-z case insensitively even for
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* non-ascii.
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*/
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static int Curl_raw_equal(const char *first, const char *second)
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{
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while(*first && *second) {
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if(Curl_raw_toupper(*first) != Curl_raw_toupper(*second))
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/* get out of the loop as soon as they don't match */
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break;
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first++;
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second++;
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}
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/* we do the comparison here (possibly again), just to make sure that if the
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loop above is skipped because one of the strings reached zero, we must not
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return this as a successful match */
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return (Curl_raw_toupper(*first) == Curl_raw_toupper(*second));
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}
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static int Curl_raw_nequal(const char *first, const char *second, size_t max)
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{
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while(*first && *second && max) {
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if(Curl_raw_toupper(*first) != Curl_raw_toupper(*second)) {
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break;
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}
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max--;
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first++;
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second++;
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}
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if(0 == max)
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return 1; /* they are equal this far */
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return Curl_raw_toupper(*first) == Curl_raw_toupper(*second);
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}
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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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* http://tools.ietf.org/html/rfc6125#section-6.4.3
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*/
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static int hostmatch(const char *hostname, const 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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pattern_wildcard = strchr(pattern, '*');
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if(pattern_wildcard == NULL)
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return Curl_raw_equal(pattern, hostname) ?
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CURL_HOST_MATCH : 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 == NULL || strchr(pattern_label_end+1, '.') == NULL ||
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pattern_wildcard > pattern_label_end ||
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Curl_raw_nequal(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 Curl_raw_equal(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 == NULL ||
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!Curl_raw_equal(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 Curl_raw_nequal(pattern, hostname, prefixlen) &&
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Curl_raw_nequal(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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if(!match_pattern || !*match_pattern ||
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!hostname || !*hostname) /* sanity check */
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return 0;
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if(Curl_raw_equal(hostname, match_pattern)) /* trivial case */
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return 1;
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if(hostmatch(hostname,match_pattern) == CURL_HOST_MATCH)
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return 1;
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return 0;
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}
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