1/*	$KAME: ipsec_dump_policy.c,v 1.13 2002/06/27 14:35:11 itojun Exp $	*/
2
3/*-
4 * SPDX-License-Identifier: BSD-3-Clause
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#include <sys/cdefs.h>
35__FBSDID("$FreeBSD$");
36
37#include <sys/types.h>
38#include <sys/param.h>
39#include <sys/socket.h>
40
41#include <netipsec/key_var.h>
42#include <netinet/in.h>
43#include <netipsec/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
54static const char *ipsp_dir_strs[] = {
55	"any", "in", "out",
56};
57
58static const char *ipsp_policy_strs[] = {
59	"discard", "none", "ipsec", "entrust", "bypass",
60};
61
62static char *ipsec_dump_ipsecrequest(char *, size_t,
63	struct sadb_x_ipsecrequest *, size_t);
64static int set_addresses(char *, size_t, struct sockaddr *, struct sockaddr *);
65static char *set_address(char *, size_t, struct sockaddr *);
66
67/*
68 * policy is sadb_x_policy buffer.
69 * Must call free() later.
70 * When delimiter == NULL, alternatively ' '(space) is applied.
71 */
72char *
73ipsec_dump_policy(policy, delimiter)
74	caddr_t policy;
75	char *delimiter;
76{
77	struct sadb_x_policy *xpl = (struct sadb_x_policy *)policy;
78	struct sadb_x_ipsecrequest *xisr;
79	size_t off, buflen;
80	char *buf;
81	char isrbuf[1024];
82	char *newbuf;
83
84	/* sanity check */
85	if (policy == NULL)
86		return NULL;
87	if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) {
88		__ipsec_errcode = EIPSEC_INVAL_EXTTYPE;
89		return NULL;
90	}
91
92	/* set delimiter */
93	if (delimiter == NULL)
94		delimiter = " ";
95
96	switch (xpl->sadb_x_policy_dir) {
97	case IPSEC_DIR_ANY:
98	case IPSEC_DIR_INBOUND:
99	case IPSEC_DIR_OUTBOUND:
100		break;
101	default:
102		__ipsec_errcode = EIPSEC_INVAL_DIR;
103		return NULL;
104	}
105
106	switch (xpl->sadb_x_policy_type) {
107	case IPSEC_POLICY_DISCARD:
108	case IPSEC_POLICY_NONE:
109	case IPSEC_POLICY_IPSEC:
110	case IPSEC_POLICY_BYPASS:
111	case IPSEC_POLICY_ENTRUST:
112		break;
113	default:
114		__ipsec_errcode = EIPSEC_INVAL_POLICY;
115		return NULL;
116	}
117
118	buflen = strlen(ipsp_dir_strs[xpl->sadb_x_policy_dir])
119		+ 1	/* space */
120		+ strlen(ipsp_policy_strs[xpl->sadb_x_policy_type])
121		+ 1;	/* NUL */
122
123	if ((buf = malloc(buflen)) == NULL) {
124		__ipsec_errcode = EIPSEC_NO_BUFS;
125		return NULL;
126	}
127	snprintf(buf, buflen, "%s %s", ipsp_dir_strs[xpl->sadb_x_policy_dir],
128	    ipsp_policy_strs[xpl->sadb_x_policy_type]);
129
130	if (xpl->sadb_x_policy_type != IPSEC_POLICY_IPSEC) {
131		__ipsec_errcode = EIPSEC_NO_ERROR;
132		return buf;
133	}
134
135	/* count length of buffer for use */
136	off = sizeof(*xpl);
137	while (off < PFKEY_EXTLEN(xpl)) {
138		xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xpl + off);
139		off += xisr->sadb_x_ipsecrequest_len;
140	}
141
142	/* validity check */
143	if (off != PFKEY_EXTLEN(xpl)) {
144		__ipsec_errcode = EIPSEC_INVAL_SADBMSG;
145		free(buf);
146		return NULL;
147	}
148
149	off = sizeof(*xpl);
150	while (off < PFKEY_EXTLEN(xpl)) {
151		xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xpl + off);
152
153		if (ipsec_dump_ipsecrequest(isrbuf, sizeof(isrbuf), xisr,
154		    PFKEY_EXTLEN(xpl) - off) == NULL) {
155			free(buf);
156			return NULL;
157		}
158
159		buflen = strlen(buf) + strlen(delimiter) + strlen(isrbuf) + 1;
160		newbuf = (char *)realloc(buf, buflen);
161		if (newbuf == NULL) {
162			__ipsec_errcode = EIPSEC_NO_BUFS;
163			free(buf);
164			return NULL;
165		}
166		buf = newbuf;
167		snprintf(buf + strlen(buf), buflen - strlen(buf),
168		    "%s%s", delimiter, isrbuf);
169
170		off += xisr->sadb_x_ipsecrequest_len;
171	}
172
173	__ipsec_errcode = EIPSEC_NO_ERROR;
174	return buf;
175}
176
177static char *
178ipsec_dump_ipsecrequest(buf, len, xisr, bound)
179	char *buf;
180	size_t len;
181	struct sadb_x_ipsecrequest *xisr;
182	size_t bound;	/* boundary */
183{
184	const char *proto, *mode, *level;
185	char abuf[NI_MAXHOST * 2 + 2];
186
187	if (xisr->sadb_x_ipsecrequest_len > bound) {
188		__ipsec_errcode = EIPSEC_INVAL_PROTO;
189		return NULL;
190	}
191
192	switch (xisr->sadb_x_ipsecrequest_proto) {
193	case IPPROTO_ESP:
194		proto = "esp";
195		break;
196	case IPPROTO_AH:
197		proto = "ah";
198		break;
199	case IPPROTO_IPCOMP:
200		proto = "ipcomp";
201		break;
202	case IPPROTO_TCP:
203		proto = "tcp";
204		break;
205	default:
206		__ipsec_errcode = EIPSEC_INVAL_PROTO;
207		return NULL;
208	}
209
210	switch (xisr->sadb_x_ipsecrequest_mode) {
211	case IPSEC_MODE_ANY:
212		mode = "any";
213		break;
214	case IPSEC_MODE_TRANSPORT:
215		mode = "transport";
216		break;
217	case IPSEC_MODE_TUNNEL:
218		mode = "tunnel";
219		break;
220	default:
221		__ipsec_errcode = EIPSEC_INVAL_MODE;
222		return NULL;
223	}
224
225	abuf[0] = '\0';
226	if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) {
227		struct sockaddr *sa1, *sa2;
228		caddr_t p;
229
230		p = (caddr_t)(xisr + 1);
231		sa1 = (struct sockaddr *)p;
232		sa2 = (struct sockaddr *)(p + sa1->sa_len);
233		if (sizeof(*xisr) + sa1->sa_len + sa2->sa_len !=
234		    xisr->sadb_x_ipsecrequest_len) {
235			__ipsec_errcode = EIPSEC_INVAL_ADDRESS;
236			return NULL;
237		}
238		if (set_addresses(abuf, sizeof(abuf), sa1, sa2) != 0) {
239			__ipsec_errcode = EIPSEC_INVAL_ADDRESS;
240			return NULL;
241		}
242	}
243
244	switch (xisr->sadb_x_ipsecrequest_level) {
245	case IPSEC_LEVEL_DEFAULT:
246		level = "default";
247		break;
248	case IPSEC_LEVEL_USE:
249		level = "use";
250		break;
251	case IPSEC_LEVEL_REQUIRE:
252		level = "require";
253		break;
254	case IPSEC_LEVEL_UNIQUE:
255		level = "unique";
256		break;
257	default:
258		__ipsec_errcode = EIPSEC_INVAL_LEVEL;
259		return NULL;
260	}
261
262	if (xisr->sadb_x_ipsecrequest_reqid == 0)
263		snprintf(buf, len, "%s/%s/%s/%s", proto, mode, abuf, level);
264	else {
265		int ch;
266
267		if (xisr->sadb_x_ipsecrequest_reqid > IPSEC_MANUAL_REQID_MAX)
268			ch = '#';
269		else
270			ch = ':';
271		snprintf(buf, len, "%s/%s/%s/%s%c%u", proto, mode, abuf, level,
272		    ch, xisr->sadb_x_ipsecrequest_reqid);
273	}
274
275	return buf;
276}
277
278static int
279set_addresses(buf, len, sa1, sa2)
280	char *buf;
281	size_t len;
282	struct sockaddr *sa1;
283	struct sockaddr *sa2;
284{
285	char tmp1[NI_MAXHOST], tmp2[NI_MAXHOST];
286
287	if (set_address(tmp1, sizeof(tmp1), sa1) == NULL ||
288	    set_address(tmp2, sizeof(tmp2), sa2) == NULL)
289		return -1;
290	if (strlen(tmp1) + 1 + strlen(tmp2) + 1 > len)
291		return -1;
292	snprintf(buf, len, "%s-%s", tmp1, tmp2);
293	return 0;
294}
295
296static char *
297set_address(buf, len, sa)
298	char *buf;
299	size_t len;
300	struct sockaddr *sa;
301{
302	const int niflags = NI_NUMERICHOST;
303
304	if (len < 1)
305		return NULL;
306	buf[0] = '\0';
307	if (getnameinfo(sa, sa->sa_len, buf, len, NULL, 0, niflags) != 0)
308		return NULL;
309	return buf;
310}
311