1: /*
2: * Copyright (c) 1996, 1998-2005, 2007-2013
3: * Todd C. Miller <Todd.Miller@courtesan.com>
4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
17: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
18: *
19: * Sponsored in part by the Defense Advanced Research Projects
20: * Agency (DARPA) and Air Force Research Laboratory, Air Force
21: * Materiel Command, USAF, under agreement number F39502-99-1-0512.
22: */
23:
24: #include <config.h>
25:
26: #include <sys/types.h>
27: #include <sys/socket.h>
28: #include <stdio.h>
29: #ifdef STDC_HEADERS
30: # include <stdlib.h>
31: # include <stddef.h>
32: #else
33: # ifdef HAVE_STDLIB_H
34: # include <stdlib.h>
35: # endif
36: #endif /* STDC_HEADERS */
37: #ifdef HAVE_STRING_H
38: # include <string.h>
39: #endif /* HAVE_STRING_H */
40: #ifdef HAVE_STRINGS_H
41: # include <strings.h>
42: #endif /* HAVE_STRINGS_H */
43: #ifdef HAVE_UNISTD_H
44: # include <unistd.h>
45: #endif /* HAVE_UNISTD_H */
46: #include <netinet/in.h>
47: #include <arpa/inet.h>
48:
49: #include "sudoers.h"
50: #include "interfaces.h"
51:
52: static bool
53: addr_matches_if(const char *n)
54: {
55: union sudo_in_addr_un addr;
56: struct interface *ifp;
57: #ifdef HAVE_STRUCT_IN6_ADDR
58: unsigned int j;
59: #endif
60: unsigned int family;
61: debug_decl(addr_matches_if, SUDO_DEBUG_MATCH)
62:
63: #ifdef HAVE_STRUCT_IN6_ADDR
64: if (inet_pton(AF_INET6, n, &addr.ip6) == 1) {
65: family = AF_INET6;
66: } else
67: #endif /* HAVE_STRUCT_IN6_ADDR */
68: if (inet_pton(AF_INET, n, &addr.ip4) == 1) {
69: family = AF_INET;
70: } else {
71: debug_return_bool(false);
72: }
73:
74: SLIST_FOREACH(ifp, get_interfaces(), entries) {
75: if (ifp->family != family)
76: continue;
77: switch (family) {
78: case AF_INET:
79: if (ifp->addr.ip4.s_addr == addr.ip4.s_addr ||
80: (ifp->addr.ip4.s_addr & ifp->netmask.ip4.s_addr)
81: == addr.ip4.s_addr)
82: debug_return_bool(true);
83: break;
84: #ifdef HAVE_STRUCT_IN6_ADDR
85: case AF_INET6:
86: if (memcmp(ifp->addr.ip6.s6_addr, addr.ip6.s6_addr,
87: sizeof(addr.ip6.s6_addr)) == 0)
88: debug_return_bool(true);
89: for (j = 0; j < sizeof(addr.ip6.s6_addr); j++) {
90: if ((ifp->addr.ip6.s6_addr[j] & ifp->netmask.ip6.s6_addr[j]) != addr.ip6.s6_addr[j])
91: break;
92: }
93: if (j == sizeof(addr.ip6.s6_addr))
94: debug_return_bool(true);
95: break;
96: #endif /* HAVE_STRUCT_IN6_ADDR */
97: }
98: }
99:
100: debug_return_bool(false);
101: }
102:
103: static bool
104: addr_matches_if_netmask(const char *n, const char *m)
105: {
106: unsigned int i;
107: union sudo_in_addr_un addr, mask;
108: struct interface *ifp;
109: #ifdef HAVE_STRUCT_IN6_ADDR
110: unsigned int j;
111: #endif
112: unsigned int family;
113: const char *errstr;
114: debug_decl(addr_matches_if, SUDO_DEBUG_MATCH)
115:
116: #ifdef HAVE_STRUCT_IN6_ADDR
117: if (inet_pton(AF_INET6, n, &addr.ip6) == 1)
118: family = AF_INET6;
119: else
120: #endif /* HAVE_STRUCT_IN6_ADDR */
121: if (inet_pton(AF_INET, n, &addr.ip4) == 1) {
122: family = AF_INET;
123: } else {
124: debug_return_bool(false);
125: }
126:
127: if (family == AF_INET) {
128: if (strchr(m, '.')) {
129: if (inet_pton(AF_INET, m, &mask.ip4) != 1) {
130: sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
131: "IPv4 netmask %s: %s", m, "invalid value");
132: debug_return_bool(false);
133: }
134: } else {
135: i = strtonum(m, 0, 32, &errstr);
136: if (errstr != NULL) {
137: sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
138: "IPv4 netmask %s: %s", m, errstr);
139: debug_return_bool(false);
140: }
141: if (i == 0)
142: mask.ip4.s_addr = 0;
143: else if (i == 32)
144: mask.ip4.s_addr = 0xffffffff;
145: else
146: mask.ip4.s_addr = 0xffffffff - (1 << (32 - i)) + 1;
147: mask.ip4.s_addr = htonl(mask.ip4.s_addr);
148: }
149: addr.ip4.s_addr &= mask.ip4.s_addr;
150: }
151: #ifdef HAVE_STRUCT_IN6_ADDR
152: else {
153: if (inet_pton(AF_INET6, m, &mask.ip6) != 1) {
154: j = strtonum(m, 0, 128, &errstr);
155: if (errstr != NULL) {
156: sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
157: "IPv6 netmask %s: %s", m, errstr);
158: debug_return_bool(false);
159: }
160: for (i = 0; i < sizeof(addr.ip6.s6_addr); i++) {
161: if (j < i * 8)
162: mask.ip6.s6_addr[i] = 0;
163: else if (i * 8 + 8 <= j)
164: mask.ip6.s6_addr[i] = 0xff;
165: else
166: mask.ip6.s6_addr[i] = 0xff00 >> (j - i * 8);
167: addr.ip6.s6_addr[i] &= mask.ip6.s6_addr[i];
168: }
169: }
170: }
171: #endif /* HAVE_STRUCT_IN6_ADDR */
172:
173: SLIST_FOREACH(ifp, get_interfaces(), entries) {
174: if (ifp->family != family)
175: continue;
176: switch (family) {
177: case AF_INET:
178: if ((ifp->addr.ip4.s_addr & mask.ip4.s_addr) == addr.ip4.s_addr)
179: debug_return_bool(true);
180: break;
181: #ifdef HAVE_STRUCT_IN6_ADDR
182: case AF_INET6:
183: for (j = 0; j < sizeof(addr.ip6.s6_addr); j++) {
184: if ((ifp->addr.ip6.s6_addr[j] & mask.ip6.s6_addr[j]) != addr.ip6.s6_addr[j])
185: break;
186: }
187: if (j == sizeof(addr.ip6.s6_addr))
188: debug_return_bool(true);
189: break;
190: #endif /* HAVE_STRUCT_IN6_ADDR */
191: }
192: }
193:
194: debug_return_bool(false);
195: }
196:
197: /*
198: * Returns true if "n" is one of our ip addresses or if
199: * "n" is a network that we are on, else returns false.
200: */
201: bool
202: addr_matches(char *n)
203: {
204: char *m;
205: bool rc;
206: debug_decl(addr_matches, SUDO_DEBUG_MATCH)
207:
208: /* If there's an explicit netmask, use it. */
209: if ((m = strchr(n, '/'))) {
210: *m++ = '\0';
211: rc = addr_matches_if_netmask(n, m);
212: *(m - 1) = '/';
213: } else
214: rc = addr_matches_if(n);
215:
216: sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
217: "IP address %s matches local host: %s", n, rc ? "true" : "false");
218: debug_return_bool(rc);
219: }
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