1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2022, 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_GSKIT) \
|| 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
#error #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.
*
* Return TRUE on a match. FALSE if not.
*/
static bool hostmatch(const char *hostname,
size_t hostlen,
const char *pattern,
size_t patternlen)
{
const char *pattern_label_end, *wildcard, *hostname_label_end;
size_t prefixlen, suffixlen;
/* normalize pattern and hostname by stripping off trailing dots */
DEBUGASSERT(patternlen);
if(hostname[hostlen-1]=='.')
hostlen--;
if(pattern[patternlen-1]=='.')
patternlen--;
wildcard = memchr(pattern, '*', patternlen);
if(!wildcard)
return pmatch(hostname, hostlen, pattern, patternlen);
/* detect IP address as hostname and fail the match if so */
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) ||
strncasecompare(pattern, "xn--", 4))
return pmatch(hostname, hostlen, pattern, patternlen);
hostname_label_end = memchr(hostname, '.', hostlen);
if(!hostname_label_end)
return FALSE;
else {
size_t skiphost = hostname_label_end - hostname;
size_t skiplen = pattern_label_end - pattern;
if(!pmatch(hostname_label_end, hostlen - skiphost,
pattern_label_end, patternlen - skiplen))
return FALSE;
}
/* The wildcard must match at least one character, so the left-most
label of the hostname is at least as large as the left-most label
of the pattern. */
if(hostname_label_end - hostname < pattern_label_end - pattern)
return FALSE;
prefixlen = wildcard - pattern;
suffixlen = pattern_label_end - (wildcard + 1);
return strncasecompare(pattern, hostname, prefixlen) &&
strncasecompare(wildcard + 1, hostname_label_end - suffixlen,
suffixlen) ? TRUE : 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, GSKIT or schannel+wince */
|
