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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 1996, 1998-2005, 2007-2015
* Todd C. Miller <Todd.Miller@sudo.ws>
*
* 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.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#ifdef NEED_RESOLV_H
# include <arpa/nameser.h>
# include <resolv.h>
#endif /* NEED_RESOLV_H */
#include <sudoers.h>
#include <interfaces.h>
static int
addr_matches_if(const char *n)
{
union sudo_in_addr_un addr;
struct interface *ifp;
#ifdef HAVE_STRUCT_IN6_ADDR
size_t j;
#endif
unsigned int family;
debug_decl(addr_matches_if, SUDOERS_DEBUG_MATCH);
#ifdef HAVE_STRUCT_IN6_ADDR
if (inet_pton(AF_INET6, n, &addr.ip6) == 1) {
family = AF_INET6;
} else
#endif /* HAVE_STRUCT_IN6_ADDR */
if (inet_pton(AF_INET, n, &addr.ip4) == 1) {
family = AF_INET;
} else {
debug_return_int(DENY);
}
SLIST_FOREACH(ifp, get_interfaces(), entries) {
if (ifp->family != family)
continue;
switch (family) {
case AF_INET:
if (ifp->addr.ip4.s_addr == addr.ip4.s_addr ||
(ifp->addr.ip4.s_addr & ifp->netmask.ip4.s_addr)
== addr.ip4.s_addr)
debug_return_int(ALLOW);
break;
#ifdef HAVE_STRUCT_IN6_ADDR
case AF_INET6:
if (memcmp(ifp->addr.ip6.s6_addr, addr.ip6.s6_addr,
sizeof(addr.ip6.s6_addr)) == 0)
debug_return_int(ALLOW);
for (j = 0; j < sizeof(addr.ip6.s6_addr); j++) {
if ((ifp->addr.ip6.s6_addr[j] & ifp->netmask.ip6.s6_addr[j]) != addr.ip6.s6_addr[j])
break;
}
if (j == sizeof(addr.ip6.s6_addr))
debug_return_int(ALLOW);
break;
#endif /* HAVE_STRUCT_IN6_ADDR */
}
}
debug_return_int(DENY);
}
static int
addr_matches_if_netmask(const char *n, const char *m)
{
size_t i;
union sudo_in_addr_un addr, mask;
struct interface *ifp;
#ifdef HAVE_STRUCT_IN6_ADDR
size_t j;
#endif
unsigned int family;
const char *errstr;
debug_decl(addr_matches_if, SUDOERS_DEBUG_MATCH);
#ifdef HAVE_STRUCT_IN6_ADDR
if (inet_pton(AF_INET6, n, &addr.ip6) == 1)
family = AF_INET6;
else
#endif /* HAVE_STRUCT_IN6_ADDR */
if (inet_pton(AF_INET, n, &addr.ip4) == 1) {
family = AF_INET;
} else {
debug_return_int(DENY);
}
if (family == AF_INET) {
if (strchr(m, '.')) {
if (inet_pton(AF_INET, m, &mask.ip4) != 1) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"IPv4 netmask %s: %s", m, "invalid value");
debug_return_int(DENY);
}
} else {
i = (size_t)sudo_strtonum(m, 1, 32, &errstr);
if (errstr != NULL) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"IPv4 netmask %s: %s", m, errstr);
debug_return_int(DENY);
}
mask.ip4.s_addr = htonl(0xffffffffU << (32 - i));
}
addr.ip4.s_addr &= mask.ip4.s_addr;
}
#ifdef HAVE_STRUCT_IN6_ADDR
else {
if (inet_pton(AF_INET6, m, &mask.ip6) != 1) {
j = (size_t)sudo_strtonum(m, 1, 128, &errstr);
if (errstr != NULL) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"IPv6 netmask %s: %s", m, errstr);
debug_return_int(DENY);
}
for (i = 0; i < sizeof(addr.ip6.s6_addr); i++) {
if (j < i * 8)
mask.ip6.s6_addr[i] = 0;
else if (i * 8 + 8 <= j)
mask.ip6.s6_addr[i] = 0xff;
else
mask.ip6.s6_addr[i] = 0xff00 >> (j - i * 8);
addr.ip6.s6_addr[i] &= mask.ip6.s6_addr[i];
}
}
}
#endif /* HAVE_STRUCT_IN6_ADDR */
SLIST_FOREACH(ifp, get_interfaces(), entries) {
if (ifp->family != family)
continue;
switch (family) {
case AF_INET:
if ((ifp->addr.ip4.s_addr & mask.ip4.s_addr) == addr.ip4.s_addr)
debug_return_int(ALLOW);
break;
#ifdef HAVE_STRUCT_IN6_ADDR
case AF_INET6:
for (j = 0; j < sizeof(addr.ip6.s6_addr); j++) {
if ((ifp->addr.ip6.s6_addr[j] & mask.ip6.s6_addr[j]) != addr.ip6.s6_addr[j])
break;
}
if (j == sizeof(addr.ip6.s6_addr))
debug_return_int(ALLOW);
break;
#endif /* HAVE_STRUCT_IN6_ADDR */
}
}
debug_return_int(DENY);
}
/*
* Returns ALLOW if "n" is one of our ip addresses or if
* "n" is a network that we are on, else returns DENY.
*/
int
addr_matches(char *n)
{
char *m;
int ret;
debug_decl(addr_matches, SUDOERS_DEBUG_MATCH);
/* If there's an explicit netmask, use it. */
if ((m = strchr(n, '/'))) {
*m++ = '\0';
ret = addr_matches_if_netmask(n, m);
*(m - 1) = '/';
} else
ret = addr_matches_if(n);
sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
"IP address %s matches local host: %s", n,
ret == ALLOW ? "ALLOW" : "DENY");
debug_return_int(ret);
}
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