1 /* $OpenBSD: addrmatch.c,v 1.5 2010/02/26 20:29:54 djm Exp $ */
4 * Copyright (c) 2004-2008 Damien Miller <djm@mindrot.org>
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21 #include <sys/types.h>
22 #include <sys/socket.h>
23 #include <netinet/in.h>
24 #include <arpa/inet.h>
43 } xa; /* 128-bit address */
44 u_int32_t scope_id; /* iface scope id for v6 */
47 #define addr8 xa.addr8
48 #define addr32 xa.addr32
52 addr_unicast_masklen(int af)
65 masklen_valid(int af, u_int masklen)
69 return masklen <= 32 ? 0 : -1;
71 return masklen <= 128 ? 0 : -1;
78 * Convert struct sockaddr to struct xaddr
79 * Returns 0 on success, -1 on failure.
82 addr_sa_to_xaddr(struct sockaddr *sa, socklen_t slen, struct xaddr *xa)
84 struct sockaddr_in *in4 = (struct sockaddr_in *)sa;
85 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa;
87 memset(xa, '\0', sizeof(*xa));
89 switch (sa->sa_family) {
91 if (slen < sizeof(*in4))
94 memcpy(&xa->v4, &in4->sin_addr, sizeof(xa->v4));
97 if (slen < sizeof(*in6))
100 memcpy(&xa->v6, &in6->sin6_addr, sizeof(xa->v6));
101 #ifdef HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID
102 xa->scope_id = in6->sin6_scope_id;
113 * Calculate a netmask of length 'l' for address family 'af' and
115 * Returns 0 on success, -1 on failure.
118 addr_netmask(int af, u_int l, struct xaddr *n)
122 if (masklen_valid(af, l) != 0 || n == NULL)
125 memset(n, '\0', sizeof(*n));
131 n->v4.s_addr = htonl((0xffffffff << (32 - l)) & 0xffffffff);
135 for (i = 0; i < 4 && l >= 32; i++, l -= 32)
136 n->addr32[i] = 0xffffffffU;
138 n->addr32[i] = htonl((0xffffffff << (32 - l)) &
147 * Perform logical AND of addresses 'a' and 'b', storing result in 'dst'.
148 * Returns 0 on success, -1 on failure.
151 addr_and(struct xaddr *dst, const struct xaddr *a, const struct xaddr *b)
155 if (dst == NULL || a == NULL || b == NULL || a->af != b->af)
158 memcpy(dst, a, sizeof(*dst));
161 dst->v4.s_addr &= b->v4.s_addr;
164 dst->scope_id = a->scope_id;
165 for (i = 0; i < 4; i++)
166 dst->addr32[i] &= b->addr32[i];
174 * Compare addresses 'a' and 'b'
175 * Return 0 if addresses are identical, -1 if (a < b) or 1 if (a > b)
178 addr_cmp(const struct xaddr *a, const struct xaddr *b)
183 return a->af == AF_INET6 ? 1 : -1;
187 if (a->v4.s_addr == b->v4.s_addr)
189 return ntohl(a->v4.s_addr) > ntohl(b->v4.s_addr) ? 1 : -1;
191 for (i = 0; i < 16; i++)
192 if (a->addr8[i] - b->addr8[i] != 0)
193 return a->addr8[i] > b->addr8[i] ? 1 : -1;
194 if (a->scope_id == b->scope_id)
196 return a->scope_id > b->scope_id ? 1 : -1;
203 * Parse string address 'p' into 'n'
204 * Returns 0 on success, -1 on failure.
207 addr_pton(const char *p, struct xaddr *n)
209 struct addrinfo hints, *ai;
211 memset(&hints, '\0', sizeof(hints));
212 hints.ai_flags = AI_NUMERICHOST;
214 if (p == NULL || getaddrinfo(p, NULL, &hints, &ai) != 0)
217 if (ai == NULL || ai->ai_addr == NULL)
221 addr_sa_to_xaddr(ai->ai_addr, ai->ai_addrlen, n) == -1) {
231 * Perform bitwise negation of address
232 * Returns 0 on success, -1 on failure.
235 addr_invert(struct xaddr *n)
244 n->v4.s_addr = ~n->v4.s_addr;
247 for (i = 0; i < 4; i++)
248 n->addr32[i] = ~n->addr32[i];
256 * Calculate a netmask of length 'l' for address family 'af' and
258 * Returns 0 on success, -1 on failure.
261 addr_hostmask(int af, u_int l, struct xaddr *n)
263 if (addr_netmask(af, l, n) == -1 || addr_invert(n) == -1)
269 * Test whether address 'a' is all zeros (i.e. 0.0.0.0 or ::)
270 * Returns 0 on if address is all-zeros, -1 if not all zeros or on failure.
273 addr_is_all0s(const struct xaddr *a)
279 return (a->v4.s_addr == 0 ? 0 : -1);
281 for (i = 0; i < 4; i++)
282 if (a->addr32[i] != 0)
291 * Test whether host portion of address 'a', as determined by 'masklen'
293 * Returns 0 on if host portion of address is all-zeros,
294 * -1 if not all zeros or on failure.
297 addr_host_is_all0s(const struct xaddr *a, u_int masklen)
299 struct xaddr tmp_addr, tmp_mask, tmp_result;
301 memcpy(&tmp_addr, a, sizeof(tmp_addr));
302 if (addr_hostmask(a->af, masklen, &tmp_mask) == -1)
304 if (addr_and(&tmp_result, &tmp_addr, &tmp_mask) == -1)
306 return (addr_is_all0s(&tmp_result));
310 * Parse a CIDR address (x.x.x.x/y or xxxx:yyyy::/z).
311 * Return -1 on parse error, -2 on inconsistency or 0 on success.
314 addr_pton_cidr(const char *p, struct xaddr *n, u_int *l)
317 long unsigned int masklen = 999;
318 char addrbuf[64], *mp, *cp;
320 /* Don't modify argument */
321 if (p == NULL || strlcpy(addrbuf, p, sizeof(addrbuf)) > sizeof(addrbuf))
324 if ((mp = strchr(addrbuf, '/')) != NULL) {
327 masklen = strtoul(mp, &cp, 10);
328 if (*mp == '\0' || *cp != '\0' || masklen > 128)
332 if (addr_pton(addrbuf, &tmp) == -1)
336 masklen = addr_unicast_masklen(tmp.af);
337 if (masklen_valid(tmp.af, masklen) == -1)
339 if (addr_host_is_all0s(&tmp, masklen) != 0)
343 memcpy(n, &tmp, sizeof(*n));
351 addr_netmatch(const struct xaddr *host, const struct xaddr *net, u_int masklen)
353 struct xaddr tmp_mask, tmp_result;
355 if (host->af != net->af)
358 if (addr_netmask(host->af, masklen, &tmp_mask) == -1)
360 if (addr_and(&tmp_result, host, &tmp_mask) == -1)
362 return addr_cmp(&tmp_result, net);
366 * Match "addr" against list pattern list "_list", which may contain a
367 * mix of CIDR addresses and old-school wildcards.
369 * If addr is NULL, then no matching is performed, but _list is parsed
370 * and checked for well-formedness.
372 * Returns 1 on match found (never returned when addr == NULL).
373 * Returns 0 on if no match found, or no errors found when addr == NULL.
374 * Returns -1 on negated match found (never returned when addr == NULL).
375 * Returns -2 on invalid list entry.
378 addr_match_list(const char *addr, const char *_list)
381 struct xaddr try_addr, match_addr;
385 if (addr != NULL && addr_pton(addr, &try_addr) != 0) {
386 debug2("%s: couldn't parse address %.100s", __func__, addr);
389 if ((o = list = strdup(_list)) == NULL)
391 while ((cp = strsep(&list, ",")) != NULL) {
399 /* Prefer CIDR address matching */
400 r = addr_pton_cidr(cp, &match_addr, &masklen);
402 error("Inconsistent mask length for "
403 "network \"%.100s\"", cp);
407 if (addr != NULL && addr_netmatch(&try_addr,
408 &match_addr, masklen) == 0) {
418 /* If CIDR parse failed, try wildcard string match */
419 if (addr != NULL && match_pattern(addr, cp) == 1)
429 * Match "addr" against list CIDR list "_list". Lexical wildcards and
430 * negation are not supported. If "addr" == NULL, will verify structure
433 * Returns 1 on match found (never returned when addr == NULL).
434 * Returns 0 on if no match found, or no errors found when addr == NULL.
435 * Returns -1 on error
438 addr_match_cidr_list(const char *addr, const char *_list)
441 struct xaddr try_addr, match_addr;
445 if (addr != NULL && addr_pton(addr, &try_addr) != 0) {
446 debug2("%s: couldn't parse address %.100s", __func__, addr);
449 if ((o = list = strdup(_list)) == NULL)
451 while ((cp = strsep(&list, ",")) != NULL) {
453 error("%s: empty entry in list \"%.100s\"",
460 * NB. This function is called in pre-auth with untrusted data,
461 * so be extra paranoid about junk reaching getaddrino (via
465 /* Stop junk from reaching getaddrinfo. +3 is for masklen */
466 if (strlen(cp) > INET6_ADDRSTRLEN + 3) {
467 error("%s: list entry \"%.100s\" too long",
472 #define VALID_CIDR_CHARS "0123456789abcdefABCDEF.:/"
473 if (strspn(cp, VALID_CIDR_CHARS) != strlen(cp)) {
474 error("%s: list entry \"%.100s\" contains invalid "
475 "characters", __func__, cp);
479 /* Prefer CIDR address matching */
480 r = addr_pton_cidr(cp, &match_addr, &masklen);
482 error("Invalid network entry \"%.100s\"", cp);
485 } else if (r == -2) {
486 error("Inconsistent mask length for "
487 "network \"%.100s\"", cp);
490 } else if (r == 0 && addr != NULL) {
491 if (addr_netmatch(&try_addr, &match_addr,