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 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 * 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 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 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 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 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 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 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 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