2 * Routines to authenticate access to a daemon (hosts allow/deny).
4 * Copyright (C) 1998 Andrew Tridgell
5 * Copyright (C) 2004-2008 Wayne Davison
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 3 of the License, or
10 * (at your option) any later version.
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.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, visit the http://fsf.org website.
23 static int match_hostname(char *host, char *tok)
27 return wildmatch(tok, host);
30 static int match_binary(char *b1, char *b2, char *mask, int addrlen)
34 for (i = 0; i < addrlen; i++) {
35 if ((b1[i] ^ b2[i]) & mask[i])
42 static void make_mask(char *mask, int plen, int addrlen)
50 memset(mask, 0xff, w);
52 mask[w] = 0xff & (0xff<<(8-b));
54 memset(mask+w+1, 0, addrlen-w-1);
59 static int match_address(char *addr, char *tok)
62 struct addrinfo hints, *resa, *rest;
72 char *a = NULL, *t = NULL;
85 /* Fail quietly if tok is a hostname (not an address) */
86 if (strspn(tok, ".0123456789") != len
88 && strchr(tok, ':') == NULL
96 memset(&hints, 0, sizeof(hints));
97 hints.ai_family = PF_UNSPEC;
98 hints.ai_socktype = SOCK_STREAM;
100 hints.ai_flags = AI_NUMERICHOST;
103 if (getaddrinfo(addr, NULL, &hints, &resa) != 0) {
109 gai = getaddrinfo(tok, NULL, &hints, &rest);
113 rprintf(FLOG, "error matching address %s: %s\n",
114 tok, gai_strerror(gai));
119 if (rest->ai_family != resa->ai_family) {
124 switch(resa->ai_family) {
126 a = (char *)&((struct sockaddr_in *)resa->ai_addr)->sin_addr;
127 t = (char *)&((struct sockaddr_in *)rest->ai_addr)->sin_addr;
135 struct sockaddr_in6 *sin6a, *sin6t;
137 sin6a = (struct sockaddr_in6 *)resa->ai_addr;
138 sin6t = (struct sockaddr_in6 *)rest->ai_addr;
140 a = (char *)&sin6a->sin6_addr;
141 t = (char *)&sin6t->sin6_addr;
145 #ifdef HAVE_SOCKADDR_IN6_SCOPE_ID
146 if (sin6t->sin6_scope_id &&
147 sin6a->sin6_scope_id != sin6t->sin6_scope_id) {
157 rprintf(FLOG, "unknown family %u\n", rest->ai_family);
164 if (inet_pton(resa->ai_addr->sa_family, p, mask) <= 0) {
172 bits = strtol(p, &ep, 10);
174 rprintf(FLOG, "malformed mask in %s\n", tok);
179 for (pp = (unsigned char *)p; *pp; pp++) {
180 if (!isascii(*pp) || !isdigit(*pp)) {
181 rprintf(FLOG, "malformed mask in %s\n", tok);
192 if (bits < 0 || bits > (addrlen << 3)) {
193 rprintf(FLOG, "malformed mask in %s\n", tok);
203 make_mask(mask, bits, addrlen);
205 ret = match_binary(a, t, mask, addrlen);
213 static int access_match(char *list, char *addr, char *host)
216 char *list2 = strdup(list);
219 out_of_memory("access_match");
225 for (tok = strtok(list2, " ,\t"); tok; tok = strtok(NULL, " ,\t")) {
226 if (match_hostname(host, tok) || match_address(addr, tok)) {
236 int allow_access(char *addr, char *host, char *allow_list, char *deny_list)
238 if (allow_list && !*allow_list)
240 if (deny_list && !*deny_list)
243 /* If we match an allow-list item, we always allow access. */
245 if (access_match(allow_list, addr, host))
247 /* For an allow-list w/o a deny-list, disallow non-matches. */
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))
257 /* Allow all other access. */