1 /* $KAME: policy_parse.y,v 1.14 2003/06/27 03:39:20 itojun Exp $ */
2
3 /*
4 * Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 /*
33 * IN/OUT bound policy configuration take place such below:
34 * in <policy>
35 * out <policy>
36 *
37 * <policy> is one of following:
38 * "discard", "none", "ipsec <requests>", "entrust", "bypass",
39 *
40 * The following requests are accepted as <requests>:
41 *
42 * protocol/mode/src-dst/level
43 * protocol/mode/src-dst parsed as protocol/mode/src-dst/default
44 * protocol/mode/src-dst/ parsed as protocol/mode/src-dst/default
45 * protocol/transport parsed as protocol/mode/any-any/default
46 * protocol/transport//level parsed as protocol/mode/any-any/level
47 *
48 * You can concatenate these requests with either ' '(single space) or '\n'.
49 */
50
51 %{
52 #include <sys/cdefs.h>
53 __FBSDID("$FreeBSD$");
54
55 #include <sys/types.h>
56 #include <sys/param.h>
57 #include <sys/socket.h>
58
59 #include <netinet/in.h>
60 #include <netipsec/ipsec.h>
61
62 #include <stdlib.h>
63 #include <stdio.h>
64 #include <string.h>
65 #include <netdb.h>
66
67 #include "ipsec_strerror.h"
68
69 #define ATOX(c) \
70 (isdigit(c) ? (c - '0') : (isupper(c) ? (c - 'A' + 10) : (c - 'a' + 10) ))
71
72 static caddr_t pbuf = NULL; /* sadb_x_policy buffer */
73 static int tlen = 0; /* total length of pbuf */
74 static int offset = 0; /* offset of pbuf */
75 static int p_dir, p_type, p_protocol, p_mode, p_level, p_reqid;
76 static struct sockaddr *p_src = NULL;
77 static struct sockaddr *p_dst = NULL;
78
79 struct _val;
80 extern void yyerror(char *msg);
81 static struct sockaddr *parse_sockaddr(struct _val *buf);
82 static int rule_check(void);
83 static int init_x_policy(void);
84 static int set_x_request(struct sockaddr *src, struct sockaddr *dst);
85 static int set_sockaddr(struct sockaddr *addr);
86 static void policy_parse_request_init(void);
87 static caddr_t policy_parse(char *msg, int msglen);
88
89 extern void __policy__strbuffer__init__(char *msg);
90 extern void __policy__strbuffer__free__(void);
91 extern int yylex(void);
92
93 extern char *__libipsecyytext; /*XXX*/
94
95 %}
96
97 %union {
98 u_int num;
99 struct _val {
100 int len;
101 char *buf;
102 } val;
103 }
104
105 %token DIR ACTION PROTOCOL MODE LEVEL LEVEL_SPECIFY
106 %token IPADDRESS
107 %token ME ANY
108 %token SLASH HYPHEN
109 %type <num> DIR ACTION PROTOCOL MODE LEVEL
110 %type <val> IPADDRESS LEVEL_SPECIFY
111
112 %%
113 policy_spec
114 : DIR ACTION
115 {
116 p_dir = $1;
117 p_type = $2;
118
119 if (init_x_policy())
120 return -1;
121 }
122 rules
123 | DIR
124 {
125 p_dir = $1;
126 p_type = 0; /* ignored it by kernel */
127
128 if (init_x_policy())
129 return -1;
130 }
131 ;
132
133 rules
134 : /*NOTHING*/
135 | rules rule {
136 if (rule_check() < 0)
137 return -1;
138
139 if (set_x_request(p_src, p_dst) < 0)
140 return -1;
141
142 policy_parse_request_init();
143 }
144 ;
145
146 rule
147 : protocol SLASH mode SLASH addresses SLASH level
148 | protocol SLASH mode SLASH addresses SLASH
149 | protocol SLASH mode SLASH addresses
150 | protocol SLASH mode SLASH
151 | protocol SLASH mode SLASH SLASH level
152 | protocol SLASH mode
153 | protocol SLASH {
154 __ipsec_errcode = EIPSEC_FEW_ARGUMENTS;
155 return -1;
156 }
157 | protocol {
158 __ipsec_errcode = EIPSEC_FEW_ARGUMENTS;
159 return -1;
160 }
161 ;
162
163 protocol
164 : PROTOCOL { p_protocol = $1; }
165 ;
166
167 mode
168 : MODE { p_mode = $1; }
169 ;
170
171 level
172 : LEVEL {
173 p_level = $1;
174 p_reqid = 0;
175 }
176 | LEVEL_SPECIFY {
177 p_level = IPSEC_LEVEL_UNIQUE;
178 p_reqid = atol($1.buf); /* atol() is good. */
179 }
180 ;
181
182 addresses
183 : IPADDRESS {
184 p_src = parse_sockaddr(&$1);
185 if (p_src == NULL)
186 return -1;
187 }
188 HYPHEN
189 IPADDRESS {
190 p_dst = parse_sockaddr(&$4);
191 if (p_dst == NULL)
192 return -1;
193 }
194 | ME HYPHEN ANY {
195 if (p_dir != IPSEC_DIR_OUTBOUND) {
196 __ipsec_errcode = EIPSEC_INVAL_DIR;
197 return -1;
198 }
199 }
200 | ANY HYPHEN ME {
201 if (p_dir != IPSEC_DIR_INBOUND) {
202 __ipsec_errcode = EIPSEC_INVAL_DIR;
203 return -1;
204 }
205 }
206 /*
207 | ME HYPHEN ME
208 */
209 ;
210
211 %%
212
213 void
yyerror(msg)214 yyerror(msg)
215 char *msg;
216 {
217 fprintf(stderr, "libipsec: %s while parsing \"%s\"\n",
218 msg, __libipsecyytext);
219
220 return;
221 }
222
223 static struct sockaddr *
parse_sockaddr(buf)224 parse_sockaddr(buf)
225 struct _val *buf;
226 {
227 struct addrinfo hints, *res;
228 char *serv = NULL;
229 int error;
230 struct sockaddr *newaddr = NULL;
231
232 memset(&hints, 0, sizeof(hints));
233 hints.ai_family = PF_UNSPEC;
234 hints.ai_flags = AI_NUMERICHOST;
235 error = getaddrinfo(buf->buf, serv, &hints, &res);
236 if (error != 0) {
237 yyerror("invalid IP address");
238 __ipsec_set_strerror(gai_strerror(error));
239 return NULL;
240 }
241
242 if (res->ai_addr == NULL) {
243 yyerror("invalid IP address");
244 __ipsec_set_strerror(gai_strerror(error));
245 return NULL;
246 }
247
248 newaddr = malloc(res->ai_addr->sa_len);
249 if (newaddr == NULL) {
250 __ipsec_errcode = EIPSEC_NO_BUFS;
251 freeaddrinfo(res);
252 return NULL;
253 }
254 memcpy(newaddr, res->ai_addr, res->ai_addr->sa_len);
255
256 freeaddrinfo(res);
257
258 __ipsec_errcode = EIPSEC_NO_ERROR;
259 return newaddr;
260 }
261
262 static int
rule_check()263 rule_check()
264 {
265 if (p_type == IPSEC_POLICY_IPSEC) {
266 if (p_protocol == IPPROTO_IP) {
267 __ipsec_errcode = EIPSEC_NO_PROTO;
268 return -1;
269 }
270
271 if (p_mode != IPSEC_MODE_TRANSPORT
272 && p_mode != IPSEC_MODE_TUNNEL) {
273 __ipsec_errcode = EIPSEC_INVAL_MODE;
274 return -1;
275 }
276
277 if (p_src == NULL && p_dst == NULL) {
278 if (p_mode != IPSEC_MODE_TRANSPORT) {
279 __ipsec_errcode = EIPSEC_INVAL_ADDRESS;
280 return -1;
281 }
282 }
283 else if (p_src->sa_family != p_dst->sa_family) {
284 __ipsec_errcode = EIPSEC_FAMILY_MISMATCH;
285 return -1;
286 }
287 }
288
289 __ipsec_errcode = EIPSEC_NO_ERROR;
290 return 0;
291 }
292
293 static int
init_x_policy()294 init_x_policy()
295 {
296 struct sadb_x_policy *p;
297
298 tlen = sizeof(struct sadb_x_policy);
299
300 pbuf = malloc(tlen);
301 if (pbuf == NULL) {
302 __ipsec_errcode = EIPSEC_NO_BUFS;
303 return -1;
304 }
305 memset(pbuf, 0, tlen);
306 p = (struct sadb_x_policy *)pbuf;
307 p->sadb_x_policy_len = 0; /* must update later */
308 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
309 p->sadb_x_policy_type = p_type;
310 p->sadb_x_policy_dir = p_dir;
311 p->sadb_x_policy_id = 0;
312
313 offset = tlen;
314
315 __ipsec_errcode = EIPSEC_NO_ERROR;
316 return 0;
317 }
318
319 static int
set_x_request(src,dst)320 set_x_request(src, dst)
321 struct sockaddr *src, *dst;
322 {
323 struct sadb_x_ipsecrequest *p;
324 int reqlen;
325
326 reqlen = sizeof(*p)
327 + (src ? src->sa_len : 0)
328 + (dst ? dst->sa_len : 0);
329 tlen += reqlen; /* increment to total length */
330
331 pbuf = realloc(pbuf, tlen);
332 if (pbuf == NULL) {
333 __ipsec_errcode = EIPSEC_NO_BUFS;
334 return -1;
335 }
336 p = (struct sadb_x_ipsecrequest *)&pbuf[offset];
337 p->sadb_x_ipsecrequest_len = reqlen;
338 p->sadb_x_ipsecrequest_proto = p_protocol;
339 p->sadb_x_ipsecrequest_mode = p_mode;
340 p->sadb_x_ipsecrequest_level = p_level;
341 p->sadb_x_ipsecrequest_reqid = p_reqid;
342 offset += sizeof(*p);
343
344 if (set_sockaddr(src) || set_sockaddr(dst))
345 return -1;
346
347 __ipsec_errcode = EIPSEC_NO_ERROR;
348 return 0;
349 }
350
351 static int
set_sockaddr(addr)352 set_sockaddr(addr)
353 struct sockaddr *addr;
354 {
355 if (addr == NULL) {
356 __ipsec_errcode = EIPSEC_NO_ERROR;
357 return 0;
358 }
359
360 /* tlen has already incremented */
361
362 memcpy(&pbuf[offset], addr, addr->sa_len);
363
364 offset += addr->sa_len;
365
366 __ipsec_errcode = EIPSEC_NO_ERROR;
367 return 0;
368 }
369
370 static void
policy_parse_request_init()371 policy_parse_request_init()
372 {
373 p_protocol = IPPROTO_IP;
374 p_mode = IPSEC_MODE_ANY;
375 p_level = IPSEC_LEVEL_DEFAULT;
376 p_reqid = 0;
377 if (p_src != NULL) {
378 free(p_src);
379 p_src = NULL;
380 }
381 if (p_dst != NULL) {
382 free(p_dst);
383 p_dst = NULL;
384 }
385
386 return;
387 }
388
389 static caddr_t
policy_parse(msg,msglen)390 policy_parse(msg, msglen)
391 char *msg;
392 int msglen;
393 {
394 int error;
395 pbuf = NULL;
396 tlen = 0;
397
398 /* initialize */
399 p_dir = IPSEC_DIR_INVALID;
400 p_type = IPSEC_POLICY_DISCARD;
401 policy_parse_request_init();
402 __policy__strbuffer__init__(msg);
403
404 error = yyparse(); /* it must be set errcode. */
405 __policy__strbuffer__free__();
406
407 if (error) {
408 if (pbuf != NULL)
409 free(pbuf);
410 return NULL;
411 }
412
413 /* update total length */
414 ((struct sadb_x_policy *)pbuf)->sadb_x_policy_len = PFKEY_UNIT64(tlen);
415
416 __ipsec_errcode = EIPSEC_NO_ERROR;
417
418 return pbuf;
419 }
420
421 caddr_t
ipsec_set_policy(msg,msglen)422 ipsec_set_policy(msg, msglen)
423 char *msg;
424 int msglen;
425 {
426 caddr_t policy;
427
428 policy = policy_parse(msg, msglen);
429 if (policy == NULL) {
430 if (__ipsec_errcode == EIPSEC_NO_ERROR)
431 __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
432 return NULL;
433 }
434
435 __ipsec_errcode = EIPSEC_NO_ERROR;
436 return policy;
437 }
438
439