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 | |
5 | * Copyright (C) 2004, 2005 Wayne Davison | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
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 WD |
17 | * You should have received a copy of the GNU General Public License along |
18 | * with this program; if not, write to the Free Software Foundation, Inc., | |
19 | * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. | |
0f78b815 | 20 | */ |
56c473b7 AT |
21 | |
22 | #include "rsync.h" | |
23 | ||
56c473b7 AT |
24 | static int match_hostname(char *host, char *tok) |
25 | { | |
36142821 WD |
26 | if (!host || !*host) |
27 | return 0; | |
fe332038 | 28 | return wildmatch(tok, host); |
56c473b7 AT |
29 | } |
30 | ||
bc2b4963 DD |
31 | static int match_binary(char *b1, char *b2, char *mask, int addrlen) |
32 | { | |
33 | int i; | |
34 | ||
36142821 WD |
35 | for (i = 0; i < addrlen; i++) { |
36 | if ((b1[i] ^ b2[i]) & mask[i]) | |
bc2b4963 | 37 | return 0; |
bc2b4963 DD |
38 | } |
39 | ||
40 | return 1; | |
41 | } | |
42 | ||
36142821 WD |
43 | static void make_mask(char *mask, int plen, int addrlen) |
44 | { | |
bc2b4963 DD |
45 | int w, b; |
46 | ||
47 | w = plen >> 3; | |
48 | b = plen & 0x7; | |
49 | ||
50 | if (w) | |
51 | memset(mask, 0xff, w); | |
7bc8218d DD |
52 | if (w < addrlen) |
53 | mask[w] = 0xff & (0xff<<(8-b)); | |
bc2b4963 DD |
54 | if (w+1 < addrlen) |
55 | memset(mask+w+1, 0, addrlen-w-1); | |
56 | ||
57 | return; | |
58 | } | |
56c473b7 AT |
59 | |
60 | static int match_address(char *addr, char *tok) | |
61 | { | |
62 | char *p; | |
bc2b4963 DD |
63 | struct addrinfo hints, *resa, *rest; |
64 | int gai; | |
65 | int ret = 0; | |
66 | int addrlen = 0; | |
4f5b0756 | 67 | #ifdef HAVE_STRTOL |
bc2b4963 DD |
68 | long int bits; |
69 | #else | |
70 | int bits; | |
71 | #endif | |
72 | char mask[16]; | |
73 | char *a = NULL, *t = NULL; | |
32f60a6e | 74 | unsigned int len; |
56c473b7 | 75 | |
36142821 WD |
76 | if (!addr || !*addr) |
77 | return 0; | |
56c473b7 | 78 | |
56c473b7 | 79 | p = strchr(tok,'/'); |
32f60a6e WD |
80 | if (p) { |
81 | *p = '\0'; | |
82 | len = p - tok; | |
36142821 | 83 | } else |
32f60a6e | 84 | len = strlen(tok); |
56c473b7 | 85 | |
32f60a6e | 86 | /* Fail quietly if tok is a hostname (not an address) */ |
b49d381d | 87 | if (strspn(tok, ".0123456789") != len |
4f5b0756 | 88 | #ifdef INET6 |
be7cf822 | 89 | && strchr(tok, ':') == NULL |
32f60a6e | 90 | #endif |
be7cf822 WD |
91 | ) { |
92 | if (p) | |
93 | *p = '/'; | |
94 | return 0; | |
95 | } | |
70a6051c | 96 | |
bc2b4963 DD |
97 | memset(&hints, 0, sizeof(hints)); |
98 | hints.ai_family = PF_UNSPEC; | |
99 | hints.ai_socktype = SOCK_STREAM; | |
8d2aad49 | 100 | #ifdef AI_NUMERICHOST |
bc2b4963 | 101 | hints.ai_flags = AI_NUMERICHOST; |
8d2aad49 | 102 | #endif |
56c473b7 | 103 | |
be7cf822 WD |
104 | if (getaddrinfo(addr, NULL, &hints, &resa) != 0) { |
105 | if (p) | |
106 | *p = '/'; | |
107 | return 0; | |
108 | } | |
56c473b7 | 109 | |
bc2b4963 DD |
110 | gai = getaddrinfo(tok, NULL, &hints, &rest); |
111 | if (p) | |
112 | *p++ = '/'; | |
be7cf822 WD |
113 | if (gai != 0) { |
114 | rprintf(FLOG, "error matching address %s: %s\n", | |
115 | tok, gai_strerror(gai)); | |
bc2b4963 | 116 | freeaddrinfo(resa); |
56c473b7 AT |
117 | return 0; |
118 | } | |
119 | ||
bc2b4963 DD |
120 | if (rest->ai_family != resa->ai_family) { |
121 | ret = 0; | |
122 | goto out; | |
123 | } | |
124 | ||
125 | switch(resa->ai_family) { | |
126 | case PF_INET: | |
127 | a = (char *)&((struct sockaddr_in *)resa->ai_addr)->sin_addr; | |
128 | t = (char *)&((struct sockaddr_in *)rest->ai_addr)->sin_addr; | |
129 | addrlen = 4; | |
130 | ||
131 | break; | |
132 | ||
4f5b0756 | 133 | #ifdef INET6 |
bc2b4963 DD |
134 | case PF_INET6: |
135 | { | |
136 | struct sockaddr_in6 *sin6a, *sin6t; | |
56c473b7 | 137 | |
bc2b4963 DD |
138 | sin6a = (struct sockaddr_in6 *)resa->ai_addr; |
139 | sin6t = (struct sockaddr_in6 *)rest->ai_addr; | |
140 | ||
141 | a = (char *)&sin6a->sin6_addr; | |
142 | t = (char *)&sin6t->sin6_addr; | |
143 | ||
7bc8218d DD |
144 | addrlen = 16; |
145 | ||
4f5b0756 | 146 | #ifdef HAVE_SOCKADDR_IN6_SCOPE_ID |
bc2b4963 DD |
147 | if (sin6t->sin6_scope_id && |
148 | sin6a->sin6_scope_id != sin6t->sin6_scope_id) { | |
149 | ret = 0; | |
150 | goto out; | |
151 | } | |
152 | #endif | |
153 | ||
bc2b4963 DD |
154 | break; |
155 | } | |
156 | #endif | |
157 | default: | |
be7cf822 | 158 | rprintf(FLOG, "unknown family %u\n", rest->ai_family); |
bc2b4963 DD |
159 | ret = 0; |
160 | goto out; | |
161 | } | |
162 | ||
163 | bits = -1; | |
56c473b7 | 164 | if (p) { |
bc2b4963 | 165 | if (inet_pton(resa->ai_addr->sa_family, p, mask) <= 0) { |
4f5b0756 | 166 | #ifdef HAVE_STRTOL |
bc2b4963 DD |
167 | char *ep = NULL; |
168 | #else | |
169 | unsigned char *pp; | |
170 | #endif | |
171 | ||
4f5b0756 | 172 | #ifdef HAVE_STRTOL |
bc2b4963 DD |
173 | bits = strtol(p, &ep, 10); |
174 | if (!*p || *ep) { | |
be7cf822 | 175 | rprintf(FLOG, "malformed mask in %s\n", tok); |
bc2b4963 DD |
176 | ret = 0; |
177 | goto out; | |
178 | } | |
179 | #else | |
180 | for (pp = (unsigned char *)p; *pp; pp++) { | |
181 | if (!isascii(*pp) || !isdigit(*pp)) { | |
be7cf822 | 182 | rprintf(FLOG, "malformed mask in %s\n", tok); |
bc2b4963 DD |
183 | ret = 0; |
184 | goto out; | |
185 | } | |
56c473b7 | 186 | } |
bc2b4963 DD |
187 | bits = atoi(p); |
188 | #endif | |
189 | if (bits == 0) { | |
190 | ret = 1; | |
191 | goto out; | |
192 | } | |
193 | if (bits < 0 || bits > (addrlen << 3)) { | |
be7cf822 | 194 | rprintf(FLOG, "malformed mask in %s\n", tok); |
bc2b4963 DD |
195 | ret = 0; |
196 | goto out; | |
56c473b7 | 197 | } |
56c473b7 | 198 | } |
bc2b4963 DD |
199 | } else { |
200 | bits = 128; | |
56c473b7 AT |
201 | } |
202 | ||
bc2b4963 DD |
203 | if (bits >= 0) |
204 | make_mask(mask, bits, addrlen); | |
205 | ||
206 | ret = match_binary(a, t, mask, addrlen); | |
207 | ||
2997e9f7 | 208 | out: |
bc2b4963 DD |
209 | freeaddrinfo(resa); |
210 | freeaddrinfo(rest); | |
211 | return ret; | |
56c473b7 AT |
212 | } |
213 | ||
214 | static int access_match(char *list, char *addr, char *host) | |
215 | { | |
216 | char *tok; | |
217 | char *list2 = strdup(list); | |
218 | ||
36142821 WD |
219 | if (!list2) |
220 | out_of_memory("access_match"); | |
56c473b7 | 221 | |
5a96ee05 | 222 | strlower(list2); |
36142821 WD |
223 | if (host) |
224 | strlower(host); | |
5a96ee05 | 225 | |
36142821 | 226 | for (tok = strtok(list2, " ,\t"); tok; tok = strtok(NULL, " ,\t")) { |
56c473b7 AT |
227 | if (match_hostname(host, tok) || match_address(addr, tok)) { |
228 | free(list2); | |
229 | return 1; | |
230 | } | |
231 | } | |
232 | ||
233 | free(list2); | |
234 | return 0; | |
235 | } | |
236 | ||
237 | int allow_access(char *addr, char *host, char *allow_list, char *deny_list) | |
238 | { | |
36142821 WD |
239 | if (allow_list && !*allow_list) |
240 | allow_list = NULL; | |
241 | if (deny_list && !*deny_list) | |
242 | deny_list = NULL; | |
243 | ||
244 | /* If we match an allow-list item, we always allow access. */ | |
245 | if (allow_list) { | |
246 | if (access_match(allow_list, addr, host)) | |
247 | return 1; | |
248 | /* For an allow-list w/o a deny-list, disallow non-matches. */ | |
249 | if (!deny_list) | |
250 | return 0; | |
251 | } | |
252 | ||
253 | /* If we match a deny-list item (and got past any allow-list | |
254 | * items), we always disallow access. */ | |
255 | if (deny_list && access_match(deny_list, addr, host)) | |
56c473b7 AT |
256 | return 0; |
257 | ||
36142821 | 258 | /* Allow all other access. */ |
56c473b7 AT |
259 | return 1; |
260 | } |