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 | |
8e41b68e WD |
8 | * it under the terms of the GNU General Public License as published by |
9 | * the Free Software Foundation; either version 3 of the License, or | |
10 | * (at your option) any later version. | |
0f78b815 WD |
11 | * |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
e7c67065 | 17 | * You should have received a copy of the GNU General Public License along |
4fd842f9 | 18 | * with this program; if not, visit the http://fsf.org website. |
0f78b815 | 19 | */ |
56c473b7 AT |
20 | |
21 | #include "rsync.h" | |
22 | ||
56c473b7 AT |
23 | static int match_hostname(char *host, char *tok) |
24 | { | |
36142821 WD |
25 | if (!host || !*host) |
26 | return 0; | |
fe332038 | 27 | return wildmatch(tok, host); |
56c473b7 AT |
28 | } |
29 | ||
bc2b4963 DD |
30 | static int match_binary(char *b1, char *b2, char *mask, int addrlen) |
31 | { | |
32 | int i; | |
33 | ||
36142821 WD |
34 | for (i = 0; i < addrlen; i++) { |
35 | if ((b1[i] ^ b2[i]) & mask[i]) | |
bc2b4963 | 36 | return 0; |
bc2b4963 DD |
37 | } |
38 | ||
39 | return 1; | |
40 | } | |
41 | ||
36142821 WD |
42 | static void make_mask(char *mask, int plen, int addrlen) |
43 | { | |
bc2b4963 DD |
44 | int w, b; |
45 | ||
46 | w = plen >> 3; | |
47 | b = plen & 0x7; | |
48 | ||
49 | if (w) | |
50 | memset(mask, 0xff, w); | |
7bc8218d DD |
51 | if (w < addrlen) |
52 | mask[w] = 0xff & (0xff<<(8-b)); | |
bc2b4963 DD |
53 | if (w+1 < addrlen) |
54 | memset(mask+w+1, 0, addrlen-w-1); | |
55 | ||
56 | return; | |
57 | } | |
56c473b7 AT |
58 | |
59 | static int match_address(char *addr, char *tok) | |
60 | { | |
61 | char *p; | |
bc2b4963 DD |
62 | struct addrinfo hints, *resa, *rest; |
63 | int gai; | |
64 | int ret = 0; | |
65 | int addrlen = 0; | |
4f5b0756 | 66 | #ifdef HAVE_STRTOL |
bc2b4963 DD |
67 | long int bits; |
68 | #else | |
69 | int bits; | |
70 | #endif | |
71 | char mask[16]; | |
72 | char *a = NULL, *t = NULL; | |
32f60a6e | 73 | unsigned int len; |
56c473b7 | 74 | |
36142821 WD |
75 | if (!addr || !*addr) |
76 | return 0; | |
56c473b7 | 77 | |
56c473b7 | 78 | p = strchr(tok,'/'); |
32f60a6e WD |
79 | if (p) { |
80 | *p = '\0'; | |
81 | len = p - tok; | |
36142821 | 82 | } else |
32f60a6e | 83 | len = strlen(tok); |
56c473b7 | 84 | |
32f60a6e | 85 | /* Fail quietly if tok is a hostname (not an address) */ |
b49d381d | 86 | if (strspn(tok, ".0123456789") != len |
4f5b0756 | 87 | #ifdef INET6 |
be7cf822 | 88 | && strchr(tok, ':') == NULL |
32f60a6e | 89 | #endif |
be7cf822 WD |
90 | ) { |
91 | if (p) | |
92 | *p = '/'; | |
93 | return 0; | |
94 | } | |
70a6051c | 95 | |
bc2b4963 DD |
96 | memset(&hints, 0, sizeof(hints)); |
97 | hints.ai_family = PF_UNSPEC; | |
98 | hints.ai_socktype = SOCK_STREAM; | |
8d2aad49 | 99 | #ifdef AI_NUMERICHOST |
bc2b4963 | 100 | hints.ai_flags = AI_NUMERICHOST; |
8d2aad49 | 101 | #endif |
56c473b7 | 102 | |
be7cf822 WD |
103 | if (getaddrinfo(addr, NULL, &hints, &resa) != 0) { |
104 | if (p) | |
105 | *p = '/'; | |
106 | return 0; | |
107 | } | |
56c473b7 | 108 | |
bc2b4963 DD |
109 | gai = getaddrinfo(tok, NULL, &hints, &rest); |
110 | if (p) | |
111 | *p++ = '/'; | |
be7cf822 WD |
112 | if (gai != 0) { |
113 | rprintf(FLOG, "error matching address %s: %s\n", | |
114 | tok, gai_strerror(gai)); | |
bc2b4963 | 115 | freeaddrinfo(resa); |
56c473b7 AT |
116 | return 0; |
117 | } | |
118 | ||
bc2b4963 DD |
119 | if (rest->ai_family != resa->ai_family) { |
120 | ret = 0; | |
121 | goto out; | |
122 | } | |
123 | ||
124 | switch(resa->ai_family) { | |
125 | case PF_INET: | |
126 | a = (char *)&((struct sockaddr_in *)resa->ai_addr)->sin_addr; | |
127 | t = (char *)&((struct sockaddr_in *)rest->ai_addr)->sin_addr; | |
128 | addrlen = 4; | |
129 | ||
130 | break; | |
131 | ||
4f5b0756 | 132 | #ifdef INET6 |
bc2b4963 DD |
133 | case PF_INET6: |
134 | { | |
135 | struct sockaddr_in6 *sin6a, *sin6t; | |
56c473b7 | 136 | |
bc2b4963 DD |
137 | sin6a = (struct sockaddr_in6 *)resa->ai_addr; |
138 | sin6t = (struct sockaddr_in6 *)rest->ai_addr; | |
139 | ||
140 | a = (char *)&sin6a->sin6_addr; | |
141 | t = (char *)&sin6t->sin6_addr; | |
142 | ||
7bc8218d DD |
143 | addrlen = 16; |
144 | ||
4f5b0756 | 145 | #ifdef HAVE_SOCKADDR_IN6_SCOPE_ID |
bc2b4963 DD |
146 | if (sin6t->sin6_scope_id && |
147 | sin6a->sin6_scope_id != sin6t->sin6_scope_id) { | |
148 | ret = 0; | |
149 | goto out; | |
150 | } | |
151 | #endif | |
152 | ||
bc2b4963 DD |
153 | break; |
154 | } | |
155 | #endif | |
156 | default: | |
be7cf822 | 157 | rprintf(FLOG, "unknown family %u\n", rest->ai_family); |
bc2b4963 DD |
158 | ret = 0; |
159 | goto out; | |
160 | } | |
161 | ||
162 | bits = -1; | |
56c473b7 | 163 | if (p) { |
bc2b4963 | 164 | if (inet_pton(resa->ai_addr->sa_family, p, mask) <= 0) { |
4f5b0756 | 165 | #ifdef HAVE_STRTOL |
bc2b4963 DD |
166 | char *ep = NULL; |
167 | #else | |
168 | unsigned char *pp; | |
169 | #endif | |
170 | ||
4f5b0756 | 171 | #ifdef HAVE_STRTOL |
bc2b4963 DD |
172 | bits = strtol(p, &ep, 10); |
173 | if (!*p || *ep) { | |
be7cf822 | 174 | rprintf(FLOG, "malformed mask in %s\n", tok); |
bc2b4963 DD |
175 | ret = 0; |
176 | goto out; | |
177 | } | |
178 | #else | |
179 | for (pp = (unsigned char *)p; *pp; pp++) { | |
180 | if (!isascii(*pp) || !isdigit(*pp)) { | |
be7cf822 | 181 | rprintf(FLOG, "malformed mask in %s\n", tok); |
bc2b4963 DD |
182 | ret = 0; |
183 | goto out; | |
184 | } | |
56c473b7 | 185 | } |
bc2b4963 DD |
186 | bits = atoi(p); |
187 | #endif | |
188 | if (bits == 0) { | |
189 | ret = 1; | |
190 | goto out; | |
191 | } | |
192 | if (bits < 0 || bits > (addrlen << 3)) { | |
be7cf822 | 193 | rprintf(FLOG, "malformed mask in %s\n", tok); |
bc2b4963 DD |
194 | ret = 0; |
195 | goto out; | |
56c473b7 | 196 | } |
56c473b7 | 197 | } |
bc2b4963 DD |
198 | } else { |
199 | bits = 128; | |
56c473b7 AT |
200 | } |
201 | ||
bc2b4963 DD |
202 | if (bits >= 0) |
203 | make_mask(mask, bits, addrlen); | |
204 | ||
205 | ret = match_binary(a, t, mask, addrlen); | |
206 | ||
2997e9f7 | 207 | out: |
bc2b4963 DD |
208 | freeaddrinfo(resa); |
209 | freeaddrinfo(rest); | |
210 | return ret; | |
56c473b7 AT |
211 | } |
212 | ||
213 | static int access_match(char *list, char *addr, char *host) | |
214 | { | |
215 | char *tok; | |
216 | char *list2 = strdup(list); | |
217 | ||
36142821 WD |
218 | if (!list2) |
219 | out_of_memory("access_match"); | |
56c473b7 | 220 | |
5a96ee05 | 221 | strlower(list2); |
36142821 WD |
222 | if (host) |
223 | strlower(host); | |
5a96ee05 | 224 | |
36142821 | 225 | for (tok = strtok(list2, " ,\t"); tok; tok = strtok(NULL, " ,\t")) { |
56c473b7 AT |
226 | if (match_hostname(host, tok) || match_address(addr, tok)) { |
227 | free(list2); | |
228 | return 1; | |
229 | } | |
230 | } | |
231 | ||
232 | free(list2); | |
233 | return 0; | |
234 | } | |
235 | ||
236 | int allow_access(char *addr, char *host, char *allow_list, char *deny_list) | |
237 | { | |
36142821 WD |
238 | if (allow_list && !*allow_list) |
239 | allow_list = NULL; | |
240 | if (deny_list && !*deny_list) | |
241 | deny_list = NULL; | |
242 | ||
243 | /* If we match an allow-list item, we always allow access. */ | |
244 | if (allow_list) { | |
245 | if (access_match(allow_list, addr, host)) | |
246 | return 1; | |
247 | /* For an allow-list w/o a deny-list, disallow non-matches. */ | |
248 | if (!deny_list) | |
249 | return 0; | |
250 | } | |
251 | ||
252 | /* If we match a deny-list item (and got past any allow-list | |
253 | * items), we always disallow access. */ | |
254 | if (deny_list && access_match(deny_list, addr, host)) | |
56c473b7 AT |
255 | return 0; |
256 | ||
36142821 | 257 | /* Allow all other access. */ |
56c473b7 AT |
258 | return 1; |
259 | } |