Commit | Line | Data |
---|---|---|
56c473b7 | 1 | /* |
0f78b815 WD |
2 | * Routines to authenticate access to a daemon (hosts allow/deny). |
3 | * | |
4 | * Copyright (C) 1998 Andrew Tridgell | |
ba2133d6 | 5 | * Copyright (C) 2004-2007 Wayne Davison |
0f78b815 WD |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
4fd842f9 | 8 | * it under the terms of the GNU General Public License version 3 as |
ba2133d6 | 9 | * published by the Free Software Foundation. |
0f78b815 WD |
10 | * |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
e7c67065 | 16 | * You should have received a copy of the GNU General Public License along |
4fd842f9 | 17 | * with this program; if not, visit the http://fsf.org website. |
0f78b815 | 18 | */ |
56c473b7 AT |
19 | |
20 | #include "rsync.h" | |
21 | ||
56c473b7 AT |
22 | static int match_hostname(char *host, char *tok) |
23 | { | |
36142821 WD |
24 | if (!host || !*host) |
25 | return 0; | |
fe332038 | 26 | return wildmatch(tok, host); |
56c473b7 AT |
27 | } |
28 | ||
bc2b4963 DD |
29 | static int match_binary(char *b1, char *b2, char *mask, int addrlen) |
30 | { | |
31 | int i; | |
32 | ||
36142821 WD |
33 | for (i = 0; i < addrlen; i++) { |
34 | if ((b1[i] ^ b2[i]) & mask[i]) | |
bc2b4963 | 35 | return 0; |
bc2b4963 DD |
36 | } |
37 | ||
38 | return 1; | |
39 | } | |
40 | ||
36142821 WD |
41 | static void make_mask(char *mask, int plen, int addrlen) |
42 | { | |
bc2b4963 DD |
43 | int w, b; |
44 | ||
45 | w = plen >> 3; | |
46 | b = plen & 0x7; | |
47 | ||
48 | if (w) | |
49 | memset(mask, 0xff, w); | |
7bc8218d DD |
50 | if (w < addrlen) |
51 | mask[w] = 0xff & (0xff<<(8-b)); | |
bc2b4963 DD |
52 | if (w+1 < addrlen) |
53 | memset(mask+w+1, 0, addrlen-w-1); | |
54 | ||
55 | return; | |
56 | } | |
56c473b7 AT |
57 | |
58 | static int match_address(char *addr, char *tok) | |
59 | { | |
60 | char *p; | |
bc2b4963 DD |
61 | struct addrinfo hints, *resa, *rest; |
62 | int gai; | |
63 | int ret = 0; | |
64 | int addrlen = 0; | |
4f5b0756 | 65 | #ifdef HAVE_STRTOL |
bc2b4963 DD |
66 | long int bits; |
67 | #else | |
68 | int bits; | |
69 | #endif | |
70 | char mask[16]; | |
71 | char *a = NULL, *t = NULL; | |
32f60a6e | 72 | unsigned int len; |
56c473b7 | 73 | |
36142821 WD |
74 | if (!addr || !*addr) |
75 | return 0; | |
56c473b7 | 76 | |
56c473b7 | 77 | p = strchr(tok,'/'); |
32f60a6e WD |
78 | if (p) { |
79 | *p = '\0'; | |
80 | len = p - tok; | |
36142821 | 81 | } else |
32f60a6e | 82 | len = strlen(tok); |
56c473b7 | 83 | |
32f60a6e | 84 | /* Fail quietly if tok is a hostname (not an address) */ |
b49d381d | 85 | if (strspn(tok, ".0123456789") != len |
4f5b0756 | 86 | #ifdef INET6 |
be7cf822 | 87 | && strchr(tok, ':') == NULL |
32f60a6e | 88 | #endif |
be7cf822 WD |
89 | ) { |
90 | if (p) | |
91 | *p = '/'; | |
92 | return 0; | |
93 | } | |
70a6051c | 94 | |
bc2b4963 DD |
95 | memset(&hints, 0, sizeof(hints)); |
96 | hints.ai_family = PF_UNSPEC; | |
97 | hints.ai_socktype = SOCK_STREAM; | |
8d2aad49 | 98 | #ifdef AI_NUMERICHOST |
bc2b4963 | 99 | hints.ai_flags = AI_NUMERICHOST; |
8d2aad49 | 100 | #endif |
56c473b7 | 101 | |
be7cf822 WD |
102 | if (getaddrinfo(addr, NULL, &hints, &resa) != 0) { |
103 | if (p) | |
104 | *p = '/'; | |
105 | return 0; | |
106 | } | |
56c473b7 | 107 | |
bc2b4963 DD |
108 | gai = getaddrinfo(tok, NULL, &hints, &rest); |
109 | if (p) | |
110 | *p++ = '/'; | |
be7cf822 WD |
111 | if (gai != 0) { |
112 | rprintf(FLOG, "error matching address %s: %s\n", | |
113 | tok, gai_strerror(gai)); | |
bc2b4963 | 114 | freeaddrinfo(resa); |
56c473b7 AT |
115 | return 0; |
116 | } | |
117 | ||
bc2b4963 DD |
118 | if (rest->ai_family != resa->ai_family) { |
119 | ret = 0; | |
120 | goto out; | |
121 | } | |
122 | ||
123 | switch(resa->ai_family) { | |
124 | case PF_INET: | |
125 | a = (char *)&((struct sockaddr_in *)resa->ai_addr)->sin_addr; | |
126 | t = (char *)&((struct sockaddr_in *)rest->ai_addr)->sin_addr; | |
127 | addrlen = 4; | |
128 | ||
129 | break; | |
130 | ||
4f5b0756 | 131 | #ifdef INET6 |
bc2b4963 DD |
132 | case PF_INET6: |
133 | { | |
134 | struct sockaddr_in6 *sin6a, *sin6t; | |
56c473b7 | 135 | |
bc2b4963 DD |
136 | sin6a = (struct sockaddr_in6 *)resa->ai_addr; |
137 | sin6t = (struct sockaddr_in6 *)rest->ai_addr; | |
138 | ||
139 | a = (char *)&sin6a->sin6_addr; | |
140 | t = (char *)&sin6t->sin6_addr; | |
141 | ||
7bc8218d DD |
142 | addrlen = 16; |
143 | ||
4f5b0756 | 144 | #ifdef HAVE_SOCKADDR_IN6_SCOPE_ID |
bc2b4963 DD |
145 | if (sin6t->sin6_scope_id && |
146 | sin6a->sin6_scope_id != sin6t->sin6_scope_id) { | |
147 | ret = 0; | |
148 | goto out; | |
149 | } | |
150 | #endif | |
151 | ||
bc2b4963 DD |
152 | break; |
153 | } | |
154 | #endif | |
155 | default: | |
be7cf822 | 156 | rprintf(FLOG, "unknown family %u\n", rest->ai_family); |
bc2b4963 DD |
157 | ret = 0; |
158 | goto out; | |
159 | } | |
160 | ||
161 | bits = -1; | |
56c473b7 | 162 | if (p) { |
bc2b4963 | 163 | if (inet_pton(resa->ai_addr->sa_family, p, mask) <= 0) { |
4f5b0756 | 164 | #ifdef HAVE_STRTOL |
bc2b4963 DD |
165 | char *ep = NULL; |
166 | #else | |
167 | unsigned char *pp; | |
168 | #endif | |
169 | ||
4f5b0756 | 170 | #ifdef HAVE_STRTOL |
bc2b4963 DD |
171 | bits = strtol(p, &ep, 10); |
172 | if (!*p || *ep) { | |
be7cf822 | 173 | rprintf(FLOG, "malformed mask in %s\n", tok); |
bc2b4963 DD |
174 | ret = 0; |
175 | goto out; | |
176 | } | |
177 | #else | |
178 | for (pp = (unsigned char *)p; *pp; pp++) { | |
179 | if (!isascii(*pp) || !isdigit(*pp)) { | |
be7cf822 | 180 | rprintf(FLOG, "malformed mask in %s\n", tok); |
bc2b4963 DD |
181 | ret = 0; |
182 | goto out; | |
183 | } | |
56c473b7 | 184 | } |
bc2b4963 DD |
185 | bits = atoi(p); |
186 | #endif | |
187 | if (bits == 0) { | |
188 | ret = 1; | |
189 | goto out; | |
190 | } | |
191 | if (bits < 0 || bits > (addrlen << 3)) { | |
be7cf822 | 192 | rprintf(FLOG, "malformed mask in %s\n", tok); |
bc2b4963 DD |
193 | ret = 0; |
194 | goto out; | |
56c473b7 | 195 | } |
56c473b7 | 196 | } |
bc2b4963 DD |
197 | } else { |
198 | bits = 128; | |
56c473b7 AT |
199 | } |
200 | ||
bc2b4963 DD |
201 | if (bits >= 0) |
202 | make_mask(mask, bits, addrlen); | |
203 | ||
204 | ret = match_binary(a, t, mask, addrlen); | |
205 | ||
2997e9f7 | 206 | out: |
bc2b4963 DD |
207 | freeaddrinfo(resa); |
208 | freeaddrinfo(rest); | |
209 | return ret; | |
56c473b7 AT |
210 | } |
211 | ||
212 | static int access_match(char *list, char *addr, char *host) | |
213 | { | |
214 | char *tok; | |
215 | char *list2 = strdup(list); | |
216 | ||
36142821 WD |
217 | if (!list2) |
218 | out_of_memory("access_match"); | |
56c473b7 | 219 | |
5a96ee05 | 220 | strlower(list2); |
36142821 WD |
221 | if (host) |
222 | strlower(host); | |
5a96ee05 | 223 | |
36142821 | 224 | for (tok = strtok(list2, " ,\t"); tok; tok = strtok(NULL, " ,\t")) { |
56c473b7 AT |
225 | if (match_hostname(host, tok) || match_address(addr, tok)) { |
226 | free(list2); | |
227 | return 1; | |
228 | } | |
229 | } | |
230 | ||
231 | free(list2); | |
232 | return 0; | |
233 | } | |
234 | ||
235 | int allow_access(char *addr, char *host, char *allow_list, char *deny_list) | |
236 | { | |
36142821 WD |
237 | if (allow_list && !*allow_list) |
238 | allow_list = NULL; | |
239 | if (deny_list && !*deny_list) | |
240 | deny_list = NULL; | |
241 | ||
242 | /* If we match an allow-list item, we always allow access. */ | |
243 | if (allow_list) { | |
244 | if (access_match(allow_list, addr, host)) | |
245 | return 1; | |
246 | /* For an allow-list w/o a deny-list, disallow non-matches. */ | |
247 | if (!deny_list) | |
248 | return 0; | |
249 | } | |
250 | ||
251 | /* If we match a deny-list item (and got past any allow-list | |
252 | * items), we always disallow access. */ | |
253 | if (deny_list && access_match(deny_list, addr, host)) | |
56c473b7 AT |
254 | return 0; |
255 | ||
36142821 | 256 | /* Allow all other access. */ |
56c473b7 AT |
257 | return 1; |
258 | } |