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/* $OpenBSD: addrmatch.c,v 1.17 2021/04/03 06:18:40 djm Exp $ */
/*
* Copyright (c) 2004-2008 Damien Miller <djm@mindrot.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "includes.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include "addr.h"
#include "match.h"
#include "log.h"
/*
* Match "addr" against list pattern list "_list", which may contain a
* mix of CIDR addresses and old-school wildcards.
*
* If addr is NULL, then no matching is performed, but _list is parsed
* and checked for well-formedness.
*
* Returns 1 on match found (never returned when addr == NULL).
* Returns 0 on if no match found, or no errors found when addr == NULL.
* Returns -1 on negated match found (never returned when addr == NULL).
* Returns -2 on invalid list entry.
*/
int
addr_match_list(const char *addr, const char *_list)
{
char *list, *cp, *o;
struct xaddr try_addr, match_addr;
u_int masklen, neg;
int ret = 0, r;
if (addr != NULL && addr_pton(addr, &try_addr) != 0) {
debug2_f("couldn't parse address %.100s", addr);
return 0;
}
if ((o = list = strdup(_list)) == NULL)
return -1;
while ((cp = strsep(&list, ",")) != NULL) {
neg = *cp == '!';
if (neg)
cp++;
if (*cp == '\0') {
ret = -2;
break;
}
/* Prefer CIDR address matching */
r = addr_pton_cidr(cp, &match_addr, &masklen);
if (r == -2) {
debug2_f("inconsistent mask length for "
"match network \"%.100s\"", cp);
ret = -2;
break;
} else if (r == 0) {
if (addr != NULL && addr_netmatch(&try_addr,
&match_addr, masklen) == 0) {
foundit:
if (neg) {
ret = -1;
break;
}
ret = 1;
}
continue;
} else {
/* If CIDR parse failed, try wildcard string match */
if (addr != NULL && match_pattern(addr, cp) == 1)
goto foundit;
}
}
free(o);
return ret;
}
/*
* Match "addr" against list CIDR list "_list". Lexical wildcards and
* negation are not supported. If "addr" == NULL, will verify structure
* of "_list".
*
* Returns 1 on match found (never returned when addr == NULL).
* Returns 0 on if no match found, or no errors found when addr == NULL.
* Returns -1 on error
*/
int
addr_match_cidr_list(const char *addr, const char *_list)
{
char *list, *cp, *o;
struct xaddr try_addr, match_addr;
u_int masklen;
int ret = 0, r;
if (addr != NULL && addr_pton(addr, &try_addr) != 0) {
debug2_f("couldn't parse address %.100s", addr);
return 0;
}
if ((o = list = strdup(_list)) == NULL)
return -1;
while ((cp = strsep(&list, ",")) != NULL) {
if (*cp == '\0') {
error_f("empty entry in list \"%.100s\"", o);
ret = -1;
break;
}
/*
* NB. This function is called in pre-auth with untrusted data,
* so be extra paranoid about junk reaching getaddrino (via
* addr_pton_cidr).
*/
/* Stop junk from reaching getaddrinfo. +3 is for masklen */
if (strlen(cp) > INET6_ADDRSTRLEN + 3) {
error_f("list entry \"%.100s\" too long", cp);
ret = -1;
break;
}
#define VALID_CIDR_CHARS "0123456789abcdefABCDEF.:/"
if (strspn(cp, VALID_CIDR_CHARS) != strlen(cp)) {
error_f("list entry \"%.100s\" contains invalid "
"characters", cp);
ret = -1;
}
/* Prefer CIDR address matching */
r = addr_pton_cidr(cp, &match_addr, &masklen);
if (r == -1) {
error("Invalid network entry \"%.100s\"", cp);
ret = -1;
break;
} else if (r == -2) {
error("Inconsistent mask length for "
"network \"%.100s\"", cp);
ret = -1;
break;
} else if (r == 0 && addr != NULL) {
if (addr_netmatch(&try_addr, &match_addr,
masklen) == 0)
ret = 1;
continue;
}
}
free(o);
return ret;
}
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