1 /* $NetBSD: ipsec_dump_policy.c,v 1.11 2018/05/28 20:45:38 maxv Exp $ */
2
3 /* Id: ipsec_dump_policy.c,v 1.10 2005/06/29 09:12:37 manubsd Exp */
4
5 /*
6 * Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #ifdef HAVE_CONFIG_H
35 #include "config.h"
36 #endif
37
38 #include <sys/types.h>
39 #include <sys/param.h>
40 #include <sys/socket.h>
41
42 #include <netinet/in.h>
43 #include PATH_IPSEC_H
44
45 #include <arpa/inet.h>
46
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <string.h>
50 #include <netdb.h>
51
52 #include "ipsec_strerror.h"
53 #include "libpfkey.h"
54
55 static const char *ipsp_dir_strs[] = {
56 "any", "in", "out", "fwd",
57 #ifdef __linux__
58 "in(socket)", "out(socket)"
59 #endif
60 };
61
62 static const char *ipsp_policy_strs[] = {
63 "discard", "none", "ipsec", "entrust", "bypass",
64 };
65
66 static char *ipsec_dump_ipsecrequest(char *, size_t,
67 struct sadb_x_ipsecrequest *, size_t, int);
68 static char *ipsec_dump_policy1(void *, const char *, int);
69 static int set_addresses(char *, size_t, struct sockaddr *,
70 struct sockaddr *, int);
71 static char *set_address(char *, size_t, struct sockaddr *, int);
72
73 /*
74 * policy is sadb_x_policy buffer.
75 * Must call free() later.
76 * When delimiter == NULL, alternatively ' '(space) is applied.
77 */
78 char *
ipsec_dump_policy(ipsec_policy_t policy,__ipsec_const char * delimiter)79 ipsec_dump_policy(ipsec_policy_t policy, __ipsec_const char *delimiter)
80 {
81 return ipsec_dump_policy1(policy, delimiter, 0);
82 }
83
84 char *
ipsec_dump_policy_withports(void * policy,const char * delimiter)85 ipsec_dump_policy_withports(void *policy, const char *delimiter)
86 {
87 return ipsec_dump_policy1(policy, delimiter, 1);
88 }
89
90 static char *
ipsec_dump_policy1(void * policy,const char * delimiter,int withports)91 ipsec_dump_policy1(void *policy, const char *delimiter, int withports)
92 {
93 struct sadb_x_policy *xpl = policy;
94 struct sadb_x_ipsecrequest *xisr;
95 size_t off, buflen;
96 char *buf;
97 char isrbuf[1024];
98 char *newbuf;
99
100 #ifdef HAVE_PFKEY_POLICY_PRIORITY
101 int32_t priority_offset;
102 char *priority_str;
103 char operator;
104 #endif
105
106 /* sanity check */
107 if (policy == NULL)
108 return NULL;
109 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) {
110 __ipsec_errcode = EIPSEC_INVAL_EXTTYPE;
111 return NULL;
112 }
113
114 /* set delimiter */
115 if (delimiter == NULL)
116 delimiter = " ";
117
118 #ifdef HAVE_PFKEY_POLICY_PRIORITY
119 if (xpl->sadb_x_policy_priority == 0)
120 {
121 priority_offset = 0;
122 priority_str = "";
123 }
124 /* find which constant the priority is closest to */
125 else if (xpl->sadb_x_policy_priority <
126 (u_int32_t) (PRIORITY_DEFAULT / 4) * 3)
127 {
128 priority_offset = xpl->sadb_x_policy_priority - PRIORITY_HIGH;
129 priority_str = "prio high";
130 }
131 else if (xpl->sadb_x_policy_priority >=
132 (u_int32_t) (PRIORITY_DEFAULT / 4) * 3 &&
133 xpl->sadb_x_policy_priority <
134 (u_int32_t) (PRIORITY_DEFAULT / 4) * 5)
135 {
136 priority_offset = xpl->sadb_x_policy_priority - PRIORITY_DEFAULT;
137 priority_str = "prio def";
138 }
139 else
140 {
141 priority_offset = xpl->sadb_x_policy_priority - PRIORITY_LOW;
142 priority_str = "prio low";
143 }
144
145 /* fix sign to match the way it is input */
146 priority_offset *= -1;
147 if (priority_offset < 0)
148 {
149 operator = '-';
150 priority_offset *= -1;
151 }
152 else
153 {
154 operator = '+';
155 }
156 #endif
157
158 switch (xpl->sadb_x_policy_dir) {
159 case IPSEC_DIR_ANY:
160 case IPSEC_DIR_INBOUND:
161 case IPSEC_DIR_OUTBOUND:
162 #ifdef HAVE_POLICY_FWD
163 case IPSEC_DIR_FWD:
164 case IPSEC_DIR_FWD + 1:
165 case IPSEC_DIR_FWD + 2:
166 #endif
167 break;
168 default:
169 __ipsec_errcode = EIPSEC_INVAL_DIR;
170 return NULL;
171 }
172
173 switch (xpl->sadb_x_policy_type) {
174 case IPSEC_POLICY_DISCARD:
175 case IPSEC_POLICY_NONE:
176 case IPSEC_POLICY_IPSEC:
177 case IPSEC_POLICY_BYPASS:
178 case IPSEC_POLICY_ENTRUST:
179 break;
180 default:
181 __ipsec_errcode = EIPSEC_INVAL_POLICY;
182 return NULL;
183 }
184
185 buflen = strlen(ipsp_dir_strs[xpl->sadb_x_policy_dir])
186 + 1 /* space */
187 #ifdef HAVE_PFKEY_POLICY_PRIORITY
188 + strlen(priority_str)
189 + ((priority_offset != 0) ? 13 : 0) /* [space operator space int] */
190 + ((strlen(priority_str) != 0) ? 1 : 0) /* space */
191 #endif
192 + strlen(ipsp_policy_strs[xpl->sadb_x_policy_type])
193 + 1; /* NUL */
194
195 if ((buf = malloc(buflen)) == NULL) {
196 __ipsec_errcode = EIPSEC_NO_BUFS;
197 return NULL;
198 }
199 #ifdef HAVE_PFKEY_POLICY_PRIORITY
200 if (priority_offset != 0)
201 {
202 snprintf(buf, buflen, "%s %s %c %u %s",
203 ipsp_dir_strs[xpl->sadb_x_policy_dir], priority_str, operator,
204 priority_offset, ipsp_policy_strs[xpl->sadb_x_policy_type]);
205 }
206 else if (strlen (priority_str) != 0)
207 {
208 snprintf(buf, buflen, "%s %s %s",
209 ipsp_dir_strs[xpl->sadb_x_policy_dir], priority_str,
210 ipsp_policy_strs[xpl->sadb_x_policy_type]);
211 }
212 else
213 {
214 snprintf(buf, buflen, "%s %s",
215 ipsp_dir_strs[xpl->sadb_x_policy_dir],
216 ipsp_policy_strs[xpl->sadb_x_policy_type]);
217 }
218 #else
219 snprintf(buf, buflen, "%s %s", ipsp_dir_strs[xpl->sadb_x_policy_dir],
220 ipsp_policy_strs[xpl->sadb_x_policy_type]);
221 #endif
222
223 if (xpl->sadb_x_policy_type != IPSEC_POLICY_IPSEC) {
224 __ipsec_errcode = EIPSEC_NO_ERROR;
225 return buf;
226 }
227
228 /* count length of buffer for use */
229 off = sizeof(*xpl);
230 while (off < PFKEY_EXTLEN(xpl)) {
231 xisr = (void *)((caddr_t)(void *)xpl + off);
232 off += xisr->sadb_x_ipsecrequest_len;
233 }
234
235 /* validity check */
236 if (off != PFKEY_EXTLEN(xpl)) {
237 __ipsec_errcode = EIPSEC_INVAL_SADBMSG;
238 free(buf);
239 return NULL;
240 }
241
242 off = sizeof(*xpl);
243 while (off < PFKEY_EXTLEN(xpl)) {
244 int offset;
245 xisr = (void *)((caddr_t)(void *)xpl + off);
246
247 if (ipsec_dump_ipsecrequest(isrbuf, sizeof(isrbuf), xisr,
248 PFKEY_EXTLEN(xpl) - off, withports) == NULL) {
249 free(buf);
250 return NULL;
251 }
252
253 offset = strlen(buf);
254 buflen = offset + strlen(delimiter) + strlen(isrbuf) + 1;
255 newbuf = (char *)realloc(buf, buflen);
256 if (newbuf == NULL) {
257 __ipsec_errcode = EIPSEC_NO_BUFS;
258 free(buf);
259 return NULL;
260 }
261 buf = newbuf;
262 snprintf(buf+offset, buflen-offset, "%s%s", delimiter, isrbuf);
263
264 off += xisr->sadb_x_ipsecrequest_len;
265 }
266
267 __ipsec_errcode = EIPSEC_NO_ERROR;
268 return buf;
269 }
270
271 static char *
ipsec_dump_ipsecrequest(char * buf,size_t len,struct sadb_x_ipsecrequest * xisr,size_t bound,int withports)272 ipsec_dump_ipsecrequest(char *buf, size_t len, struct sadb_x_ipsecrequest *xisr,
273 size_t bound /* boundary */, int withports)
274 {
275 const char *proto, *mode, *level;
276 char abuf[NI_MAXHOST * 2 + 2];
277
278 if (xisr->sadb_x_ipsecrequest_len > bound) {
279 __ipsec_errcode = EIPSEC_INVAL_PROTO;
280 return NULL;
281 }
282
283 switch (xisr->sadb_x_ipsecrequest_proto) {
284 case IPPROTO_ESP:
285 proto = "esp";
286 break;
287 case IPPROTO_AH:
288 proto = "ah";
289 break;
290 case IPPROTO_IPCOMP:
291 proto = "ipcomp";
292 break;
293 default:
294 __ipsec_errcode = EIPSEC_INVAL_PROTO;
295 return NULL;
296 }
297
298 switch (xisr->sadb_x_ipsecrequest_mode) {
299 case IPSEC_MODE_ANY:
300 mode = "any";
301 break;
302 case IPSEC_MODE_TRANSPORT:
303 mode = "transport";
304 break;
305 case IPSEC_MODE_TUNNEL:
306 mode = "tunnel";
307 break;
308 default:
309 __ipsec_errcode = EIPSEC_INVAL_MODE;
310 return NULL;
311 }
312
313 abuf[0] = '\0';
314 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) {
315 struct sockaddr *sa1, *sa2;
316 caddr_t p;
317
318 p = (void *)(xisr + 1);
319 sa1 = (void *)p;
320 sa2 = (void *)(p + sysdep_sa_len(sa1));
321 if (sizeof(*xisr) + sysdep_sa_len(sa1) + sysdep_sa_len(sa2) !=
322 xisr->sadb_x_ipsecrequest_len) {
323 __ipsec_errcode = EIPSEC_INVAL_ADDRESS;
324 return NULL;
325 }
326 if (set_addresses(abuf, sizeof(abuf),
327 sa1, sa2, withports) != 0) {
328 __ipsec_errcode = EIPSEC_INVAL_ADDRESS;
329 return NULL;
330 }
331 }
332
333 switch (xisr->sadb_x_ipsecrequest_level) {
334 case IPSEC_LEVEL_DEFAULT:
335 level = "default";
336 break;
337 case IPSEC_LEVEL_USE:
338 level = "use";
339 break;
340 case IPSEC_LEVEL_REQUIRE:
341 level = "require";
342 break;
343 case IPSEC_LEVEL_UNIQUE:
344 level = "unique";
345 break;
346 default:
347 __ipsec_errcode = EIPSEC_INVAL_LEVEL;
348 return NULL;
349 }
350
351 if (xisr->sadb_x_ipsecrequest_reqid == 0)
352 snprintf(buf, len, "%s/%s/%s/%s", proto, mode, abuf, level);
353 else {
354 int ch;
355
356 if (xisr->sadb_x_ipsecrequest_reqid > IPSEC_MANUAL_REQID_MAX)
357 ch = '#';
358 else
359 ch = ':';
360 snprintf(buf, len, "%s/%s/%s/%s%c%u", proto, mode, abuf, level,
361 ch, xisr->sadb_x_ipsecrequest_reqid);
362 }
363
364 return buf;
365 }
366
367 static int
set_addresses(char * buf,size_t len,struct sockaddr * sa1,struct sockaddr * sa2,int withports)368 set_addresses(char *buf, size_t len, struct sockaddr *sa1, struct sockaddr *sa2,
369 int withports)
370 {
371 char tmp1[NI_MAXHOST], tmp2[NI_MAXHOST];
372
373 if (set_address(tmp1, sizeof(tmp1), sa1, withports) == NULL ||
374 set_address(tmp2, sizeof(tmp2), sa2, withports) == NULL)
375 return -1;
376 if (strlen(tmp1) + 1 + strlen(tmp2) + 1 > len)
377 return -1;
378 snprintf(buf, len, "%s-%s", tmp1, tmp2);
379 return 0;
380 }
381
382 static char *
set_address(char * buf,size_t len,struct sockaddr * sa,int withports)383 set_address(char *buf, size_t len, struct sockaddr *sa, int withports)
384 {
385 const int niflags = NI_NUMERICHOST | NI_NUMERICSERV;
386 char host[NI_MAXHOST];
387 char serv[NI_MAXSERV];
388
389 if (len < 1)
390 return NULL;
391 buf[0] = '\0';
392 if (getnameinfo(sa, (socklen_t)sysdep_sa_len(sa), host, sizeof(host),
393 serv, sizeof(serv), niflags) != 0)
394 return NULL;
395
396 if (withports)
397 snprintf(buf, len, "%s[%s]", host, serv);
398 else
399 snprintf(buf, len, "%s", host);
400
401 return buf;
402 }
403