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 yyparse(void); |
---|
92 | extern int yylex(void); |
---|
93 | |
---|
94 | extern char *__libipsecyytext; /*XXX*/ |
---|
95 | |
---|
96 | %} |
---|
97 | |
---|
98 | %union { |
---|
99 | u_int num; |
---|
100 | struct _val { |
---|
101 | int len; |
---|
102 | char *buf; |
---|
103 | } val; |
---|
104 | } |
---|
105 | |
---|
106 | %token DIR ACTION PROTOCOL MODE LEVEL LEVEL_SPECIFY |
---|
107 | %token IPADDRESS |
---|
108 | %token ME ANY |
---|
109 | %token SLASH HYPHEN |
---|
110 | %type <num> DIR ACTION PROTOCOL MODE LEVEL |
---|
111 | %type <val> IPADDRESS LEVEL_SPECIFY |
---|
112 | |
---|
113 | %% |
---|
114 | policy_spec |
---|
115 | : DIR ACTION |
---|
116 | { |
---|
117 | p_dir = $1; |
---|
118 | p_type = $2; |
---|
119 | |
---|
120 | if (init_x_policy()) |
---|
121 | return -1; |
---|
122 | } |
---|
123 | rules |
---|
124 | | DIR |
---|
125 | { |
---|
126 | p_dir = $1; |
---|
127 | p_type = 0; /* ignored it by kernel */ |
---|
128 | |
---|
129 | if (init_x_policy()) |
---|
130 | return -1; |
---|
131 | } |
---|
132 | ; |
---|
133 | |
---|
134 | rules |
---|
135 | : /*NOTHING*/ |
---|
136 | | rules rule { |
---|
137 | if (rule_check() < 0) |
---|
138 | return -1; |
---|
139 | |
---|
140 | if (set_x_request(p_src, p_dst) < 0) |
---|
141 | return -1; |
---|
142 | |
---|
143 | policy_parse_request_init(); |
---|
144 | } |
---|
145 | ; |
---|
146 | |
---|
147 | rule |
---|
148 | : protocol SLASH mode SLASH addresses SLASH level |
---|
149 | | protocol SLASH mode SLASH addresses SLASH |
---|
150 | | protocol SLASH mode SLASH addresses |
---|
151 | | protocol SLASH mode SLASH |
---|
152 | | protocol SLASH mode SLASH SLASH level |
---|
153 | | protocol SLASH mode |
---|
154 | | protocol SLASH { |
---|
155 | __ipsec_errcode = EIPSEC_FEW_ARGUMENTS; |
---|
156 | return -1; |
---|
157 | } |
---|
158 | | protocol { |
---|
159 | __ipsec_errcode = EIPSEC_FEW_ARGUMENTS; |
---|
160 | return -1; |
---|
161 | } |
---|
162 | ; |
---|
163 | |
---|
164 | protocol |
---|
165 | : PROTOCOL { p_protocol = $1; } |
---|
166 | ; |
---|
167 | |
---|
168 | mode |
---|
169 | : MODE { p_mode = $1; } |
---|
170 | ; |
---|
171 | |
---|
172 | level |
---|
173 | : LEVEL { |
---|
174 | p_level = $1; |
---|
175 | p_reqid = 0; |
---|
176 | } |
---|
177 | | LEVEL_SPECIFY { |
---|
178 | p_level = IPSEC_LEVEL_UNIQUE; |
---|
179 | p_reqid = atol($1.buf); /* atol() is good. */ |
---|
180 | } |
---|
181 | ; |
---|
182 | |
---|
183 | addresses |
---|
184 | : IPADDRESS { |
---|
185 | p_src = parse_sockaddr(&$1); |
---|
186 | if (p_src == NULL) |
---|
187 | return -1; |
---|
188 | } |
---|
189 | HYPHEN |
---|
190 | IPADDRESS { |
---|
191 | p_dst = parse_sockaddr(&$4); |
---|
192 | if (p_dst == NULL) |
---|
193 | return -1; |
---|
194 | } |
---|
195 | | ME HYPHEN ANY { |
---|
196 | if (p_dir != IPSEC_DIR_OUTBOUND) { |
---|
197 | __ipsec_errcode = EIPSEC_INVAL_DIR; |
---|
198 | return -1; |
---|
199 | } |
---|
200 | } |
---|
201 | | ANY HYPHEN ME { |
---|
202 | if (p_dir != IPSEC_DIR_INBOUND) { |
---|
203 | __ipsec_errcode = EIPSEC_INVAL_DIR; |
---|
204 | return -1; |
---|
205 | } |
---|
206 | } |
---|
207 | /* |
---|
208 | | ME HYPHEN ME |
---|
209 | */ |
---|
210 | ; |
---|
211 | |
---|
212 | %% |
---|
213 | |
---|
214 | void |
---|
215 | yyerror(msg) |
---|
216 | char *msg; |
---|
217 | { |
---|
218 | fprintf(stderr, "libipsec: %s while parsing \"%s\"\n", |
---|
219 | msg, __libipsecyytext); |
---|
220 | |
---|
221 | return; |
---|
222 | } |
---|
223 | |
---|
224 | static struct sockaddr * |
---|
225 | parse_sockaddr(buf) |
---|
226 | struct _val *buf; |
---|
227 | { |
---|
228 | struct addrinfo hints, *res; |
---|
229 | char *serv = NULL; |
---|
230 | int error; |
---|
231 | struct sockaddr *newaddr = NULL; |
---|
232 | |
---|
233 | memset(&hints, 0, sizeof(hints)); |
---|
234 | hints.ai_family = PF_UNSPEC; |
---|
235 | hints.ai_flags = AI_NUMERICHOST; |
---|
236 | error = getaddrinfo(buf->buf, serv, &hints, &res); |
---|
237 | if (error != 0) { |
---|
238 | yyerror("invalid IP address"); |
---|
239 | __ipsec_set_strerror(gai_strerror(error)); |
---|
240 | return NULL; |
---|
241 | } |
---|
242 | |
---|
243 | if (res->ai_addr == NULL) { |
---|
244 | yyerror("invalid IP address"); |
---|
245 | __ipsec_set_strerror(gai_strerror(error)); |
---|
246 | return NULL; |
---|
247 | } |
---|
248 | |
---|
249 | newaddr = malloc(res->ai_addr->sa_len); |
---|
250 | if (newaddr == NULL) { |
---|
251 | __ipsec_errcode = EIPSEC_NO_BUFS; |
---|
252 | freeaddrinfo(res); |
---|
253 | return NULL; |
---|
254 | } |
---|
255 | memcpy(newaddr, res->ai_addr, res->ai_addr->sa_len); |
---|
256 | |
---|
257 | freeaddrinfo(res); |
---|
258 | |
---|
259 | __ipsec_errcode = EIPSEC_NO_ERROR; |
---|
260 | return newaddr; |
---|
261 | } |
---|
262 | |
---|
263 | static int |
---|
264 | rule_check() |
---|
265 | { |
---|
266 | if (p_type == IPSEC_POLICY_IPSEC) { |
---|
267 | if (p_protocol == IPPROTO_IP) { |
---|
268 | __ipsec_errcode = EIPSEC_NO_PROTO; |
---|
269 | return -1; |
---|
270 | } |
---|
271 | |
---|
272 | if (p_mode != IPSEC_MODE_TRANSPORT |
---|
273 | && p_mode != IPSEC_MODE_TUNNEL) { |
---|
274 | __ipsec_errcode = EIPSEC_INVAL_MODE; |
---|
275 | return -1; |
---|
276 | } |
---|
277 | |
---|
278 | if (p_src == NULL && p_dst == NULL) { |
---|
279 | if (p_mode != IPSEC_MODE_TRANSPORT) { |
---|
280 | __ipsec_errcode = EIPSEC_INVAL_ADDRESS; |
---|
281 | return -1; |
---|
282 | } |
---|
283 | } |
---|
284 | else if (p_src->sa_family != p_dst->sa_family) { |
---|
285 | __ipsec_errcode = EIPSEC_FAMILY_MISMATCH; |
---|
286 | return -1; |
---|
287 | } |
---|
288 | } |
---|
289 | |
---|
290 | __ipsec_errcode = EIPSEC_NO_ERROR; |
---|
291 | return 0; |
---|
292 | } |
---|
293 | |
---|
294 | static int |
---|
295 | init_x_policy() |
---|
296 | { |
---|
297 | struct sadb_x_policy *p; |
---|
298 | |
---|
299 | tlen = sizeof(struct sadb_x_policy); |
---|
300 | |
---|
301 | pbuf = malloc(tlen); |
---|
302 | if (pbuf == NULL) { |
---|
303 | __ipsec_errcode = EIPSEC_NO_BUFS; |
---|
304 | return -1; |
---|
305 | } |
---|
306 | memset(pbuf, 0, tlen); |
---|
307 | p = (struct sadb_x_policy *)pbuf; |
---|
308 | p->sadb_x_policy_len = 0; /* must update later */ |
---|
309 | p->sadb_x_policy_exttype = SADB_X_EXT_POLICY; |
---|
310 | p->sadb_x_policy_type = p_type; |
---|
311 | p->sadb_x_policy_dir = p_dir; |
---|
312 | p->sadb_x_policy_id = 0; |
---|
313 | |
---|
314 | offset = tlen; |
---|
315 | |
---|
316 | __ipsec_errcode = EIPSEC_NO_ERROR; |
---|
317 | return 0; |
---|
318 | } |
---|
319 | |
---|
320 | static int |
---|
321 | set_x_request(src, dst) |
---|
322 | struct sockaddr *src, *dst; |
---|
323 | { |
---|
324 | struct sadb_x_ipsecrequest *p; |
---|
325 | int reqlen; |
---|
326 | |
---|
327 | reqlen = sizeof(*p) |
---|
328 | + (src ? src->sa_len : 0) |
---|
329 | + (dst ? dst->sa_len : 0); |
---|
330 | tlen += reqlen; /* increment to total length */ |
---|
331 | |
---|
332 | pbuf = realloc(pbuf, tlen); |
---|
333 | if (pbuf == NULL) { |
---|
334 | __ipsec_errcode = EIPSEC_NO_BUFS; |
---|
335 | return -1; |
---|
336 | } |
---|
337 | p = (struct sadb_x_ipsecrequest *)&pbuf[offset]; |
---|
338 | p->sadb_x_ipsecrequest_len = reqlen; |
---|
339 | p->sadb_x_ipsecrequest_proto = p_protocol; |
---|
340 | p->sadb_x_ipsecrequest_mode = p_mode; |
---|
341 | p->sadb_x_ipsecrequest_level = p_level; |
---|
342 | p->sadb_x_ipsecrequest_reqid = p_reqid; |
---|
343 | offset += sizeof(*p); |
---|
344 | |
---|
345 | if (set_sockaddr(src) || set_sockaddr(dst)) |
---|
346 | return -1; |
---|
347 | |
---|
348 | __ipsec_errcode = EIPSEC_NO_ERROR; |
---|
349 | return 0; |
---|
350 | } |
---|
351 | |
---|
352 | static int |
---|
353 | set_sockaddr(addr) |
---|
354 | struct sockaddr *addr; |
---|
355 | { |
---|
356 | if (addr == NULL) { |
---|
357 | __ipsec_errcode = EIPSEC_NO_ERROR; |
---|
358 | return 0; |
---|
359 | } |
---|
360 | |
---|
361 | /* tlen has already incremented */ |
---|
362 | |
---|
363 | memcpy(&pbuf[offset], addr, addr->sa_len); |
---|
364 | |
---|
365 | offset += addr->sa_len; |
---|
366 | |
---|
367 | __ipsec_errcode = EIPSEC_NO_ERROR; |
---|
368 | return 0; |
---|
369 | } |
---|
370 | |
---|
371 | static void |
---|
372 | policy_parse_request_init() |
---|
373 | { |
---|
374 | p_protocol = IPPROTO_IP; |
---|
375 | p_mode = IPSEC_MODE_ANY; |
---|
376 | p_level = IPSEC_LEVEL_DEFAULT; |
---|
377 | p_reqid = 0; |
---|
378 | if (p_src != NULL) { |
---|
379 | free(p_src); |
---|
380 | p_src = NULL; |
---|
381 | } |
---|
382 | if (p_dst != NULL) { |
---|
383 | free(p_dst); |
---|
384 | p_dst = NULL; |
---|
385 | } |
---|
386 | |
---|
387 | return; |
---|
388 | } |
---|
389 | |
---|
390 | static caddr_t |
---|
391 | policy_parse(msg, msglen) |
---|
392 | char *msg; |
---|
393 | int msglen; |
---|
394 | { |
---|
395 | int error; |
---|
396 | pbuf = NULL; |
---|
397 | tlen = 0; |
---|
398 | |
---|
399 | /* initialize */ |
---|
400 | p_dir = IPSEC_DIR_INVALID; |
---|
401 | p_type = IPSEC_POLICY_DISCARD; |
---|
402 | policy_parse_request_init(); |
---|
403 | __policy__strbuffer__init__(msg); |
---|
404 | |
---|
405 | error = yyparse(); /* it must be set errcode. */ |
---|
406 | __policy__strbuffer__free__(); |
---|
407 | |
---|
408 | if (error) { |
---|
409 | if (pbuf != NULL) |
---|
410 | free(pbuf); |
---|
411 | return NULL; |
---|
412 | } |
---|
413 | |
---|
414 | /* update total length */ |
---|
415 | ((struct sadb_x_policy *)pbuf)->sadb_x_policy_len = PFKEY_UNIT64(tlen); |
---|
416 | |
---|
417 | __ipsec_errcode = EIPSEC_NO_ERROR; |
---|
418 | |
---|
419 | return pbuf; |
---|
420 | } |
---|
421 | |
---|
422 | caddr_t |
---|
423 | ipsec_set_policy(msg, msglen) |
---|
424 | char *msg; |
---|
425 | int msglen; |
---|
426 | { |
---|
427 | caddr_t policy; |
---|
428 | |
---|
429 | policy = policy_parse(msg, msglen); |
---|
430 | if (policy == NULL) { |
---|
431 | if (__ipsec_errcode == EIPSEC_NO_ERROR) |
---|
432 | __ipsec_errcode = EIPSEC_INVAL_ARGUMENT; |
---|
433 | return NULL; |
---|
434 | } |
---|
435 | |
---|
436 | __ipsec_errcode = EIPSEC_NO_ERROR; |
---|
437 | return policy; |
---|
438 | } |
---|
439 | |
---|