Annotation of embedaddon/sudo/plugins/sudoers/match_addr.c, revision 1.1.1.2
1.1 misho 1: /*
2: * Copyright (c) 1996, 1998-2005, 2007-2011
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: #include <netdb.h>
49:
50: #include "sudoers.h"
51: #include "interfaces.h"
52:
1.1.1.2 ! misho 53: static bool
1.1 misho 54: addr_matches_if(char *n)
55: {
56: union sudo_in_addr_un addr;
57: struct interface *ifp;
1.1.1.2 ! misho 58: #ifdef HAVE_STRUCT_IN6_ADDR
1.1 misho 59: int j;
60: #endif
61: int family;
1.1.1.2 ! misho 62: debug_decl(addr_matches_if, SUDO_DEBUG_MATCH)
1.1 misho 63:
1.1.1.2 ! misho 64: #ifdef HAVE_STRUCT_IN6_ADDR
1.1 misho 65: if (inet_pton(AF_INET6, n, &addr.ip6) > 0) {
66: family = AF_INET6;
67: } else
1.1.1.2 ! misho 68: #endif /* HAVE_STRUCT_IN6_ADDR */
1.1 misho 69: {
70: family = AF_INET;
71: addr.ip4.s_addr = inet_addr(n);
72: }
73:
74: for (ifp = interfaces; ifp != NULL; ifp = ifp->next) {
75: if (ifp->family != family)
76: continue;
1.1.1.2 ! misho 77: switch (family) {
1.1 misho 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)
1.1.1.2 ! misho 82: debug_return_bool(true);
1.1 misho 83: break;
1.1.1.2 ! misho 84: #ifdef HAVE_STRUCT_IN6_ADDR
1.1 misho 85: case AF_INET6:
86: if (memcmp(ifp->addr.ip6.s6_addr, addr.ip6.s6_addr,
87: sizeof(addr.ip6.s6_addr)) == 0)
1.1.1.2 ! misho 88: debug_return_bool(true);
1.1 misho 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))
1.1.1.2 ! misho 94: debug_return_bool(true);
! 95: break;
! 96: #endif /* HAVE_STRUCT_IN6_ADDR */
1.1 misho 97: }
98: }
99:
1.1.1.2 ! misho 100: debug_return_bool(false);
1.1 misho 101: }
102:
1.1.1.2 ! misho 103: static bool
1.1 misho 104: addr_matches_if_netmask(char *n, char *m)
105: {
106: int i;
107: union sudo_in_addr_un addr, mask;
108: struct interface *ifp;
1.1.1.2 ! misho 109: #ifdef HAVE_STRUCT_IN6_ADDR
1.1 misho 110: int j;
111: #endif
112: int family;
1.1.1.2 ! misho 113: debug_decl(addr_matches_if, SUDO_DEBUG_MATCH)
1.1 misho 114:
1.1.1.2 ! misho 115: #ifdef HAVE_STRUCT_IN6_ADDR
1.1 misho 116: if (inet_pton(AF_INET6, n, &addr.ip6) > 0)
117: family = AF_INET6;
118: else
1.1.1.2 ! misho 119: #endif /* HAVE_STRUCT_IN6_ADDR */
1.1 misho 120: {
121: family = AF_INET;
122: addr.ip4.s_addr = inet_addr(n);
123: }
124:
125: if (family == AF_INET) {
126: if (strchr(m, '.')) {
127: mask.ip4.s_addr = inet_addr(m);
128: } else {
129: i = atoi(m);
130: if (i == 0)
131: mask.ip4.s_addr = 0;
132: else if (i == 32)
133: mask.ip4.s_addr = 0xffffffff;
134: else
135: mask.ip4.s_addr = 0xffffffff - (1 << (32 - i)) + 1;
136: mask.ip4.s_addr = htonl(mask.ip4.s_addr);
137: }
138: addr.ip4.s_addr &= mask.ip4.s_addr;
139: }
1.1.1.2 ! misho 140: #ifdef HAVE_STRUCT_IN6_ADDR
1.1 misho 141: else {
142: if (inet_pton(AF_INET6, m, &mask.ip6) <= 0) {
143: j = atoi(m);
144: for (i = 0; i < sizeof(addr.ip6.s6_addr); i++) {
145: if (j < i * 8)
146: mask.ip6.s6_addr[i] = 0;
147: else if (i * 8 + 8 <= j)
148: mask.ip6.s6_addr[i] = 0xff;
149: else
150: mask.ip6.s6_addr[i] = 0xff00 >> (j - i * 8);
151: addr.ip6.s6_addr[i] &= mask.ip6.s6_addr[i];
152: }
153: }
154: }
1.1.1.2 ! misho 155: #endif /* HAVE_STRUCT_IN6_ADDR */
1.1 misho 156:
157: for (ifp = interfaces; ifp != NULL; ifp = ifp->next) {
158: if (ifp->family != family)
159: continue;
1.1.1.2 ! misho 160: switch (family) {
1.1 misho 161: case AF_INET:
162: if ((ifp->addr.ip4.s_addr & mask.ip4.s_addr) == addr.ip4.s_addr)
1.1.1.2 ! misho 163: debug_return_bool(true);
! 164: break;
! 165: #ifdef HAVE_STRUCT_IN6_ADDR
1.1 misho 166: case AF_INET6:
167: for (j = 0; j < sizeof(addr.ip6.s6_addr); j++) {
168: if ((ifp->addr.ip6.s6_addr[j] & mask.ip6.s6_addr[j]) != addr.ip6.s6_addr[j])
169: break;
170: }
171: if (j == sizeof(addr.ip6.s6_addr))
1.1.1.2 ! misho 172: debug_return_bool(true);
! 173: break;
! 174: #endif /* HAVE_STRUCT_IN6_ADDR */
1.1 misho 175: }
176: }
177:
1.1.1.2 ! misho 178: debug_return_bool(false);
1.1 misho 179: }
180:
181: /*
1.1.1.2 ! misho 182: * Returns true if "n" is one of our ip addresses or if
! 183: * "n" is a network that we are on, else returns false.
1.1 misho 184: */
1.1.1.2 ! misho 185: bool
1.1 misho 186: addr_matches(char *n)
187: {
188: char *m;
1.1.1.2 ! misho 189: bool retval;
! 190: debug_decl(addr_matches, SUDO_DEBUG_MATCH)
1.1 misho 191:
192: /* If there's an explicit netmask, use it. */
193: if ((m = strchr(n, '/'))) {
194: *m++ = '\0';
195: retval = addr_matches_if_netmask(n, m);
196: *(m - 1) = '/';
197: } else
198: retval = addr_matches_if(n);
199:
1.1.1.2 ! misho 200: debug_return_bool(retval);
1.1 misho 201: }
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