Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/lib/hostcheck.c @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /***************************************************************************
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2 * _ _ ____ _
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3 * Project ___| | | | _ \| |
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4 * / __| | | | |_) | |
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5 * | (__| |_| | _ <| |___
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6 * \___|\___/|_| \_\_____|
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7 *
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8 * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 *
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10 * This software is licensed as described in the file COPYING, which
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11 * you should have received as part of this distribution. The terms
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12 * are also available at https://curl.haxx.se/docs/copyright.html.
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13 *
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14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 * copies of the Software, and permit persons to whom the Software is
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16 * furnished to do so, under the terms of the COPYING file.
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17 *
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18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 * KIND, either express or implied.
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20 *
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21 ***************************************************************************/
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22
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23 #include "curl_setup.h"
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24
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25 #if defined(USE_OPENSSL) \
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26 || defined(USE_GSKIT) \
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27 || defined(USE_SCHANNEL)
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28 /* these backends use functions from this file */
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29
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30 #ifdef HAVE_NETINET_IN_H
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31 #include <netinet/in.h>
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32 #endif
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33 #ifdef HAVE_NETINET_IN6_H
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34 #include <netinet/in6.h>
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35 #endif
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36
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37 #include "hostcheck.h"
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38 #include "strcase.h"
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39 #include "inet_pton.h"
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41 #include "curl_memory.h"
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42 /* The last #include file should be: */
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43 #include "memdebug.h"
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44
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45 /*
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46 * Match a hostname against a wildcard pattern.
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47 * E.g.
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48 * "foo.host.com" matches "*.host.com".
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49 *
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50 * We use the matching rule described in RFC6125, section 6.4.3.
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51 * https://tools.ietf.org/html/rfc6125#section-6.4.3
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52 *
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53 * In addition: ignore trailing dots in the host names and wildcards, so that
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54 * the names are used normalized. This is what the browsers do.
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55 *
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56 * Do not allow wildcard matching on IP numbers. There are apparently
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57 * certificates being used with an IP address in the CN field, thus making no
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58 * apparent distinction between a name and an IP. We need to detect the use of
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59 * an IP address and not wildcard match on such names.
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60 *
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61 * NOTE: hostmatch() gets called with copied buffers so that it can modify the
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62 * contents at will.
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63 */
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64
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65 static int hostmatch(char *hostname, char *pattern)
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66 {
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67 const char *pattern_label_end, *pattern_wildcard, *hostname_label_end;
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68 int wildcard_enabled;
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69 size_t prefixlen, suffixlen;
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70 struct in_addr ignored;
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71 #ifdef ENABLE_IPV6
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72 struct sockaddr_in6 si6;
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73 #endif
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74
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75 /* normalize pattern and hostname by stripping off trailing dots */
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76 size_t len = strlen(hostname);
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77 if(hostname[len-1]=='.')
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78 hostname[len-1] = 0;
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79 len = strlen(pattern);
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80 if(pattern[len-1]=='.')
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81 pattern[len-1] = 0;
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82
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83 pattern_wildcard = strchr(pattern, '*');
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84 if(pattern_wildcard == NULL)
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85 return strcasecompare(pattern, hostname) ?
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86 CURL_HOST_MATCH : CURL_HOST_NOMATCH;
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87
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88 /* detect IP address as hostname and fail the match if so */
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89 if(Curl_inet_pton(AF_INET, hostname, &ignored) > 0)
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90 return CURL_HOST_NOMATCH;
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91 #ifdef ENABLE_IPV6
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92 if(Curl_inet_pton(AF_INET6, hostname, &si6.sin6_addr) > 0)
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93 return CURL_HOST_NOMATCH;
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94 #endif
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95
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96 /* We require at least 2 dots in pattern to avoid too wide wildcard
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97 match. */
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98 wildcard_enabled = 1;
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99 pattern_label_end = strchr(pattern, '.');
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100 if(pattern_label_end == NULL || strchr(pattern_label_end + 1, '.') == NULL ||
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101 pattern_wildcard > pattern_label_end ||
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102 strncasecompare(pattern, "xn--", 4)) {
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103 wildcard_enabled = 0;
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104 }
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105 if(!wildcard_enabled)
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106 return strcasecompare(pattern, hostname) ?
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107 CURL_HOST_MATCH : CURL_HOST_NOMATCH;
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108
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109 hostname_label_end = strchr(hostname, '.');
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110 if(hostname_label_end == NULL ||
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111 !strcasecompare(pattern_label_end, hostname_label_end))
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112 return CURL_HOST_NOMATCH;
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113
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114 /* The wildcard must match at least one character, so the left-most
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115 label of the hostname is at least as large as the left-most label
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116 of the pattern. */
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117 if(hostname_label_end - hostname < pattern_label_end - pattern)
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118 return CURL_HOST_NOMATCH;
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119
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120 prefixlen = pattern_wildcard - pattern;
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121 suffixlen = pattern_label_end - (pattern_wildcard + 1);
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122 return strncasecompare(pattern, hostname, prefixlen) &&
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123 strncasecompare(pattern_wildcard + 1, hostname_label_end - suffixlen,
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124 suffixlen) ?
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125 CURL_HOST_MATCH : CURL_HOST_NOMATCH;
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126 }
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127
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128 int Curl_cert_hostcheck(const char *match_pattern, const char *hostname)
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129 {
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130 int res = 0;
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131 if(!match_pattern || !*match_pattern ||
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132 !hostname || !*hostname) /* sanity check */
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133 ;
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134 else {
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135 char *matchp = strdup(match_pattern);
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136 if(matchp) {
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137 char *hostp = strdup(hostname);
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138 if(hostp) {
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139 if(hostmatch(hostp, matchp) == CURL_HOST_MATCH)
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140 res = 1;
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141 free(hostp);
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142 }
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143 free(matchp);
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144 }
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145 }
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146
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147 return res;
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148 }
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149
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150 #endif /* OPENSSL, GSKIT or schannel+wince */