2 * Routines to authenticate access to a daemon (hosts allow/deny).
4 * Copyright (C) 1998 Andrew Tridgell
5 * Copyright (C) 2004, 2005 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 2 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, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
24 static int match_hostname(char *host, char *tok)
28 return wildmatch(tok, host);
31 static int match_binary(char *b1, char *b2, char *mask, int addrlen)
35 for (i = 0; i < addrlen; i++) {
36 if ((b1[i] ^ b2[i]) & mask[i])
43 static void make_mask(char *mask, int plen, int addrlen)
51 memset(mask, 0xff, w);
53 mask[w] = 0xff & (0xff<<(8-b));
55 memset(mask+w+1, 0, addrlen-w-1);
60 static int match_address(char *addr, char *tok)
63 struct addrinfo hints, *resa, *rest;
73 char *a = NULL, *t = NULL;
86 /* Fail quietly if tok is a hostname (not an address) */
87 if (strspn(tok, ".0123456789") != len
89 && strchr(tok, ':') == NULL
97 memset(&hints, 0, sizeof(hints));
98 hints.ai_family = PF_UNSPEC;
99 hints.ai_socktype = SOCK_STREAM;
100 #ifdef AI_NUMERICHOST
101 hints.ai_flags = AI_NUMERICHOST;
104 if (getaddrinfo(addr, NULL, &hints, &resa) != 0) {
110 gai = getaddrinfo(tok, NULL, &hints, &rest);
114 rprintf(FLOG, "error matching address %s: %s\n",
115 tok, gai_strerror(gai));
120 if (rest->ai_family != resa->ai_family) {
125 switch(resa->ai_family) {
127 a = (char *)&((struct sockaddr_in *)resa->ai_addr)->sin_addr;
128 t = (char *)&((struct sockaddr_in *)rest->ai_addr)->sin_addr;
136 struct sockaddr_in6 *sin6a, *sin6t;
138 sin6a = (struct sockaddr_in6 *)resa->ai_addr;
139 sin6t = (struct sockaddr_in6 *)rest->ai_addr;
141 a = (char *)&sin6a->sin6_addr;
142 t = (char *)&sin6t->sin6_addr;
146 #ifdef HAVE_SOCKADDR_IN6_SCOPE_ID
147 if (sin6t->sin6_scope_id &&
148 sin6a->sin6_scope_id != sin6t->sin6_scope_id) {
158 rprintf(FLOG, "unknown family %u\n", rest->ai_family);
165 if (inet_pton(resa->ai_addr->sa_family, p, mask) <= 0) {
173 bits = strtol(p, &ep, 10);
175 rprintf(FLOG, "malformed mask in %s\n", tok);
180 for (pp = (unsigned char *)p; *pp; pp++) {
181 if (!isascii(*pp) || !isdigit(*pp)) {
182 rprintf(FLOG, "malformed mask in %s\n", tok);
193 if (bits < 0 || bits > (addrlen << 3)) {
194 rprintf(FLOG, "malformed mask in %s\n", tok);
204 make_mask(mask, bits, addrlen);
206 ret = match_binary(a, t, mask, addrlen);
214 static int access_match(char *list, char *addr, char *host)
217 char *list2 = strdup(list);
220 out_of_memory("access_match");
226 for (tok = strtok(list2, " ,\t"); tok; tok = strtok(NULL, " ,\t")) {
227 if (match_hostname(host, tok) || match_address(addr, tok)) {
237 int allow_access(char *addr, char *host, char *allow_list, char *deny_list)
239 if (allow_list && !*allow_list)
241 if (deny_list && !*deny_list)
244 /* If we match an allow-list item, we always allow access. */
246 if (access_match(allow_list, addr, host))
248 /* For an allow-list w/o a deny-list, disallow non-matches. */
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))
258 /* Allow all other access. */