Commit | Line | Data |
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56c473b7 AT |
1 | /* |
2 | Copyright (C) Andrew Tridgell 1998 | |
3 | ||
4 | This program is free software; you can redistribute it and/or modify | |
5 | it under the terms of the GNU General Public License as published by | |
6 | the Free Software Foundation; either version 2 of the License, or | |
7 | (at your option) any later version. | |
8 | ||
9 | This program is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License | |
15 | along with this program; if not, write to the Free Software | |
16 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
17 | */ | |
18 | ||
19 | /* | |
20 | hosts allow/deny code for rsync | |
21 | ||
22 | */ | |
23 | ||
24 | #include "rsync.h" | |
25 | ||
26 | ||
27 | static int match_hostname(char *host, char *tok) | |
28 | { | |
36142821 WD |
29 | if (!host || !*host) |
30 | return 0; | |
fe332038 | 31 | return wildmatch(tok, host); |
56c473b7 AT |
32 | } |
33 | ||
bc2b4963 DD |
34 | static int match_binary(char *b1, char *b2, char *mask, int addrlen) |
35 | { | |
36 | int i; | |
37 | ||
36142821 WD |
38 | for (i = 0; i < addrlen; i++) { |
39 | if ((b1[i] ^ b2[i]) & mask[i]) | |
bc2b4963 | 40 | return 0; |
bc2b4963 DD |
41 | } |
42 | ||
43 | return 1; | |
44 | } | |
45 | ||
36142821 WD |
46 | static void make_mask(char *mask, int plen, int addrlen) |
47 | { | |
bc2b4963 DD |
48 | int w, b; |
49 | ||
50 | w = plen >> 3; | |
51 | b = plen & 0x7; | |
52 | ||
53 | if (w) | |
54 | memset(mask, 0xff, w); | |
7bc8218d DD |
55 | if (w < addrlen) |
56 | mask[w] = 0xff & (0xff<<(8-b)); | |
bc2b4963 DD |
57 | if (w+1 < addrlen) |
58 | memset(mask+w+1, 0, addrlen-w-1); | |
59 | ||
60 | return; | |
61 | } | |
56c473b7 AT |
62 | |
63 | static int match_address(char *addr, char *tok) | |
64 | { | |
65 | char *p; | |
bc2b4963 DD |
66 | struct addrinfo hints, *resa, *rest; |
67 | int gai; | |
68 | int ret = 0; | |
69 | int addrlen = 0; | |
4f5b0756 | 70 | #ifdef HAVE_STRTOL |
bc2b4963 DD |
71 | long int bits; |
72 | #else | |
73 | int bits; | |
74 | #endif | |
75 | char mask[16]; | |
76 | char *a = NULL, *t = NULL; | |
32f60a6e | 77 | unsigned int len; |
56c473b7 | 78 | |
36142821 WD |
79 | if (!addr || !*addr) |
80 | return 0; | |
56c473b7 | 81 | |
56c473b7 | 82 | p = strchr(tok,'/'); |
32f60a6e WD |
83 | if (p) { |
84 | *p = '\0'; | |
85 | len = p - tok; | |
36142821 | 86 | } else |
32f60a6e | 87 | len = strlen(tok); |
56c473b7 | 88 | |
32f60a6e | 89 | /* Fail quietly if tok is a hostname (not an address) */ |
b49d381d | 90 | if (strspn(tok, ".0123456789") != len |
4f5b0756 | 91 | #ifdef INET6 |
be7cf822 | 92 | && strchr(tok, ':') == NULL |
32f60a6e | 93 | #endif |
be7cf822 WD |
94 | ) { |
95 | if (p) | |
96 | *p = '/'; | |
97 | return 0; | |
98 | } | |
70a6051c | 99 | |
bc2b4963 DD |
100 | memset(&hints, 0, sizeof(hints)); |
101 | hints.ai_family = PF_UNSPEC; | |
102 | hints.ai_socktype = SOCK_STREAM; | |
8d2aad49 | 103 | #ifdef AI_NUMERICHOST |
bc2b4963 | 104 | hints.ai_flags = AI_NUMERICHOST; |
8d2aad49 | 105 | #endif |
56c473b7 | 106 | |
be7cf822 WD |
107 | if (getaddrinfo(addr, NULL, &hints, &resa) != 0) { |
108 | if (p) | |
109 | *p = '/'; | |
110 | return 0; | |
111 | } | |
56c473b7 | 112 | |
bc2b4963 DD |
113 | gai = getaddrinfo(tok, NULL, &hints, &rest); |
114 | if (p) | |
115 | *p++ = '/'; | |
be7cf822 WD |
116 | if (gai != 0) { |
117 | rprintf(FLOG, "error matching address %s: %s\n", | |
118 | tok, gai_strerror(gai)); | |
bc2b4963 | 119 | freeaddrinfo(resa); |
56c473b7 AT |
120 | return 0; |
121 | } | |
122 | ||
bc2b4963 DD |
123 | if (rest->ai_family != resa->ai_family) { |
124 | ret = 0; | |
125 | goto out; | |
126 | } | |
127 | ||
128 | switch(resa->ai_family) { | |
129 | case PF_INET: | |
130 | a = (char *)&((struct sockaddr_in *)resa->ai_addr)->sin_addr; | |
131 | t = (char *)&((struct sockaddr_in *)rest->ai_addr)->sin_addr; | |
132 | addrlen = 4; | |
133 | ||
134 | break; | |
135 | ||
4f5b0756 | 136 | #ifdef INET6 |
bc2b4963 DD |
137 | case PF_INET6: |
138 | { | |
139 | struct sockaddr_in6 *sin6a, *sin6t; | |
56c473b7 | 140 | |
bc2b4963 DD |
141 | sin6a = (struct sockaddr_in6 *)resa->ai_addr; |
142 | sin6t = (struct sockaddr_in6 *)rest->ai_addr; | |
143 | ||
144 | a = (char *)&sin6a->sin6_addr; | |
145 | t = (char *)&sin6t->sin6_addr; | |
146 | ||
7bc8218d DD |
147 | addrlen = 16; |
148 | ||
4f5b0756 | 149 | #ifdef HAVE_SOCKADDR_IN6_SCOPE_ID |
bc2b4963 DD |
150 | if (sin6t->sin6_scope_id && |
151 | sin6a->sin6_scope_id != sin6t->sin6_scope_id) { | |
152 | ret = 0; | |
153 | goto out; | |
154 | } | |
155 | #endif | |
156 | ||
bc2b4963 DD |
157 | break; |
158 | } | |
159 | #endif | |
160 | default: | |
be7cf822 | 161 | rprintf(FLOG, "unknown family %u\n", rest->ai_family); |
bc2b4963 DD |
162 | ret = 0; |
163 | goto out; | |
164 | } | |
165 | ||
166 | bits = -1; | |
56c473b7 | 167 | if (p) { |
bc2b4963 | 168 | if (inet_pton(resa->ai_addr->sa_family, p, mask) <= 0) { |
4f5b0756 | 169 | #ifdef HAVE_STRTOL |
bc2b4963 DD |
170 | char *ep = NULL; |
171 | #else | |
172 | unsigned char *pp; | |
173 | #endif | |
174 | ||
4f5b0756 | 175 | #ifdef HAVE_STRTOL |
bc2b4963 DD |
176 | bits = strtol(p, &ep, 10); |
177 | if (!*p || *ep) { | |
be7cf822 | 178 | rprintf(FLOG, "malformed mask in %s\n", tok); |
bc2b4963 DD |
179 | ret = 0; |
180 | goto out; | |
181 | } | |
182 | #else | |
183 | for (pp = (unsigned char *)p; *pp; pp++) { | |
184 | if (!isascii(*pp) || !isdigit(*pp)) { | |
be7cf822 | 185 | rprintf(FLOG, "malformed mask in %s\n", tok); |
bc2b4963 DD |
186 | ret = 0; |
187 | goto out; | |
188 | } | |
56c473b7 | 189 | } |
bc2b4963 DD |
190 | bits = atoi(p); |
191 | #endif | |
192 | if (bits == 0) { | |
193 | ret = 1; | |
194 | goto out; | |
195 | } | |
196 | if (bits < 0 || bits > (addrlen << 3)) { | |
be7cf822 | 197 | rprintf(FLOG, "malformed mask in %s\n", tok); |
bc2b4963 DD |
198 | ret = 0; |
199 | goto out; | |
56c473b7 | 200 | } |
56c473b7 | 201 | } |
bc2b4963 DD |
202 | } else { |
203 | bits = 128; | |
56c473b7 AT |
204 | } |
205 | ||
bc2b4963 DD |
206 | if (bits >= 0) |
207 | make_mask(mask, bits, addrlen); | |
208 | ||
209 | ret = match_binary(a, t, mask, addrlen); | |
210 | ||
2997e9f7 | 211 | out: |
bc2b4963 DD |
212 | freeaddrinfo(resa); |
213 | freeaddrinfo(rest); | |
214 | return ret; | |
56c473b7 AT |
215 | } |
216 | ||
217 | static int access_match(char *list, char *addr, char *host) | |
218 | { | |
219 | char *tok; | |
220 | char *list2 = strdup(list); | |
221 | ||
36142821 WD |
222 | if (!list2) |
223 | out_of_memory("access_match"); | |
56c473b7 | 224 | |
5a96ee05 | 225 | strlower(list2); |
36142821 WD |
226 | if (host) |
227 | strlower(host); | |
5a96ee05 | 228 | |
36142821 | 229 | for (tok = strtok(list2, " ,\t"); tok; tok = strtok(NULL, " ,\t")) { |
56c473b7 AT |
230 | if (match_hostname(host, tok) || match_address(addr, tok)) { |
231 | free(list2); | |
232 | return 1; | |
233 | } | |
234 | } | |
235 | ||
236 | free(list2); | |
237 | return 0; | |
238 | } | |
239 | ||
240 | int allow_access(char *addr, char *host, char *allow_list, char *deny_list) | |
241 | { | |
36142821 WD |
242 | if (allow_list && !*allow_list) |
243 | allow_list = NULL; | |
244 | if (deny_list && !*deny_list) | |
245 | deny_list = NULL; | |
246 | ||
247 | /* If we match an allow-list item, we always allow access. */ | |
248 | if (allow_list) { | |
249 | if (access_match(allow_list, addr, host)) | |
250 | return 1; | |
251 | /* For an allow-list w/o a deny-list, disallow non-matches. */ | |
252 | if (!deny_list) | |
253 | return 0; | |
254 | } | |
255 | ||
256 | /* If we match a deny-list item (and got past any allow-list | |
257 | * items), we always disallow access. */ | |
258 | if (deny_list && access_match(deny_list, addr, host)) | |
56c473b7 AT |
259 | return 0; |
260 | ||
36142821 | 261 | /* Allow all other access. */ |
56c473b7 AT |
262 | return 1; |
263 | } |