lib/libipsec/policy_parse.y

   1 /*      $FreeBSD: src/lib/libipsec/policy_parse.y,v 1.1.2.1 2000/07/15 07:24:04 kris Exp $      */
   2 /*      $DragonFly: src/lib/libipsec/policy_parse.y,v 1.4 2008/09/30 16:57:05 swildner Exp $    */
   3 /*      $KAME: policy_parse.y,v 1.10 2000/05/07 05:25:03 itojun 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 /*
  35  * IN/OUT bound policy configuration take place such below:
  36  *      in <policy>
  37  *      out <policy>
  38  *
  39  * <policy> is one of following:
  40  *      "discard", "none", "ipsec <requests>", "entrust", "bypass",
  41  *
  42  * The following requests are accepted as <requests>:
  43  *
  44  *      protocol/mode/src-dst/level
  45  *      protocol/mode/src-dst           parsed as protocol/mode/src-dst/default
  46  *      protocol/mode/src-dst/          parsed as protocol/mode/src-dst/default
  47  *      protocol/transport              parsed as protocol/mode/any-any/default
  48  *      protocol/transport//level       parsed as protocol/mode/any-any/level
  49  *
  50  * You can concatenate these requests with either ' '(single space) or '\n'.
  51  */
  52
  53 %{
  54 #include <sys/types.h>
  55 #include <sys/param.h>
  56 #include <sys/socket.h>
  57
  58 #include <netinet/in.h>
  59 #include <netinet6/ipsec.h>
  60
  61 #include <stdlib.h>
  62 #include <stdio.h>
  63 #include <string.h>
  64 #include <netdb.h>
  65
  66 #include "ipsec_strerror.h"
  67
  68 #define ATOX(c) \
  69   (isdigit(c) ? (c - '0') : (isupper(c) ? (c - 'A' + 10) : (c - 'a' + 10) ))
  70
  71 static caddr_t pbuf = NULL;             /* sadb_x_policy buffer */
  72 static int tlen = 0;                    /* total length of pbuf */
  73 static int offset = 0;                  /* offset of pbuf */
  74 static int p_dir, p_type, p_protocol, p_mode, p_level, p_reqid;
  75 static struct sockaddr *p_src = NULL;
  76 static struct sockaddr *p_dst = NULL;
  77
  78 struct _val;
  79 extern void yyerror (char *msg);
  80 static struct sockaddr *parse_sockaddr (struct _val *buf);
  81 static int rule_check (void);
  82 static int init_x_policy (void);
  83 static int set_x_request (struct sockaddr *src, struct sockaddr *dst);
  84 static int set_sockaddr (struct sockaddr *addr);
  85 static void policy_parse_request_init (void);
  86 static caddr_t policy_parse (char *msg, int msglen);
  87
  88 extern void __policy__strbuffer__init__ (char *msg);
  89 extern int yyparse (void);
  90 extern int yylex (void);
  91
  92 %}
  93
  94 %union {
  95         u_int num;
  96         struct _val {
  97                 int len;
  98                 char *buf;
  99         } val;
 100 }
 101
 102 %token DIR ACTION PROTOCOL MODE LEVEL LEVEL_SPECIFY
 103 %token IPADDRESS
 104 %token ME ANY
 105 %token SLASH HYPHEN
 106 %type <num> DIR ACTION PROTOCOL MODE LEVEL
 107 %type <val> IPADDRESS LEVEL_SPECIFY
 108
 109 %%
 110 policy_spec
 111         :       DIR ACTION
 112                 {
 113                         p_dir = $1;
 114                         p_type = $2;
 115
 116                         if (init_x_policy())
 117                                 return -1;
 118                 }
 119                 rules
 120         |       DIR
 121                 {
 122                         p_dir = $1;
 123                         p_type = 0;     /* ignored it by kernel */
 124
 125                         if (init_x_policy())
 126                                 return -1;
 127                 }
 128         ;
 129
 130 rules
 131         :       /*NOTHING*/
 132         |       rules rule {
 133                         if (rule_check() < 0)
 134                                 return -1;
 135
 136                         if (set_x_request(p_src, p_dst) < 0)
 137                                 return -1;
 138
 139                         policy_parse_request_init();
 140                 }
 141         ;
 142
 143 rule
 144         :       protocol SLASH mode SLASH addresses SLASH level
 145         |       protocol SLASH mode SLASH addresses SLASH
 146         |       protocol SLASH mode SLASH addresses
 147         |       protocol SLASH mode SLASH
 148         |       protocol SLASH mode SLASH SLASH level
 149         |       protocol SLASH mode
 150         |       protocol SLASH {
 151                         __ipsec_errcode = EIPSEC_FEW_ARGUMENTS;
 152                         return -1;
 153                 }
 154         |       protocol {
 155                         __ipsec_errcode = EIPSEC_FEW_ARGUMENTS;
 156                         return -1;
 157                 }
 158         ;
 159
 160 protocol
 161         :       PROTOCOL { p_protocol = $1; }
 162         ;
 163
 164 mode
 165         :       MODE { p_mode = $1; }
 166         ;
 167
 168 level
 169         :       LEVEL {
 170                         p_level = $1;
 171                         p_reqid = 0;
 172                 }
 173         |       LEVEL_SPECIFY {
 174                         p_level = IPSEC_LEVEL_UNIQUE;
 175                         p_reqid = atol($1.buf); /* atol() is good. */
 176                 }
 177         ;
 178
 179 addresses
 180         :       IPADDRESS {
 181                         p_src = parse_sockaddr(&$1);
 182                         if (p_src == NULL)
 183                                 return -1;
 184                 }
 185                 HYPHEN
 186                 IPADDRESS {
 187                         p_dst = parse_sockaddr(&$4);
 188                         if (p_dst == NULL)
 189                                 return -1;
 190                 }
 191         |       ME HYPHEN ANY {
 192                         if (p_dir != IPSEC_DIR_OUTBOUND) {
 193                                 __ipsec_errcode = EIPSEC_INVAL_DIR;
 194                                 return -1;
 195                         }
 196                 }
 197         |       ANY HYPHEN ME {
 198                         if (p_dir != IPSEC_DIR_INBOUND) {
 199                                 __ipsec_errcode = EIPSEC_INVAL_DIR;
 200                                 return -1;
 201                         }
 202                 }
 203                 /*
 204         |       ME HYPHEN ME
 205                 */
 206         ;
 207
 208 %%
 209
 210 void
 211 yyerror(char *msg)
 212 {
 213         extern char *__libipsecyytext;  /*XXX*/
 214
 215         fprintf(stderr, "libipsec: %s while parsing \"%s\"\n",
 216                 msg, __libipsecyytext);
 217
 218         return;
 219 }
 220
 221 static struct sockaddr *
 222 parse_sockaddr(struct _val *buf)
 223 {
 224         struct addrinfo hints, *res;
 225         char *serv = NULL;
 226         int error;
 227         struct sockaddr *newaddr = NULL;
 228
 229         memset(&hints, 0, sizeof(hints));
 230         hints.ai_family = PF_UNSPEC;
 231         hints.ai_flags = AI_NUMERICHOST;
 232         error = getaddrinfo(buf->buf, serv, &hints, &res);
 233         if (error != 0) {
 234                 yyerror("invalid IP address");
 235                 __ipsec_set_strerror(gai_strerror(error));
 236                 return NULL;
 237         }
 238
 239         if (res->ai_addr == NULL) {
 240                 yyerror("invalid IP address");
 241                 __ipsec_set_strerror(gai_strerror(error));
 242                 return NULL;
 243         }
 244
 245         newaddr = malloc(res->ai_addr->sa_len);
 246         if (newaddr == NULL) {
 247                 __ipsec_errcode = EIPSEC_NO_BUFS;
 248                 freeaddrinfo(res);
 249                 return NULL;
 250         }
 251         memcpy(newaddr, res->ai_addr, res->ai_addr->sa_len);
 252
 253         freeaddrinfo(res);
 254
 255         __ipsec_errcode = EIPSEC_NO_ERROR;
 256         return newaddr;
 257 }
 258
 259 static int
 260 rule_check(void)
 261 {
 262         if (p_type == IPSEC_POLICY_IPSEC) {
 263                 if (p_protocol == IPPROTO_IP) {
 264                         __ipsec_errcode = EIPSEC_NO_PROTO;
 265                         return -1;
 266                 }
 267
 268                 if (p_mode != IPSEC_MODE_TRANSPORT
 269                  && p_mode != IPSEC_MODE_TUNNEL) {
 270                         __ipsec_errcode = EIPSEC_INVAL_MODE;
 271                         return -1;
 272                 }
 273
 274                 if (p_src == NULL && p_dst == NULL) {
 275                          if (p_mode != IPSEC_MODE_TRANSPORT) {
 276                                 __ipsec_errcode = EIPSEC_INVAL_ADDRESS;
 277                                 return -1;
 278                         }
 279                 }
 280                 else if (p_src->sa_family != p_dst->sa_family) {
 281                         __ipsec_errcode = EIPSEC_FAMILY_MISMATCH;
 282                         return -1;
 283                 }
 284         }
 285
 286         __ipsec_errcode = EIPSEC_NO_ERROR;
 287         return 0;
 288 }
 289
 290 static int
 291 init_x_policy(void)
 292 {
 293         struct sadb_x_policy *p;
 294
 295         tlen = sizeof(struct sadb_x_policy);
 296
 297         pbuf = malloc(tlen);
 298         if (pbuf == NULL) {
 299                 __ipsec_errcode = EIPSEC_NO_BUFS;
 300                 return -1;
 301         }
 302         p = (struct sadb_x_policy *)pbuf;
 303         p->sadb_x_policy_len = 0;       /* must update later */
 304         p->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
 305         p->sadb_x_policy_type = p_type;
 306         p->sadb_x_policy_dir = p_dir;
 307         p->sadb_x_policy_reserved = 0;
 308         offset = tlen;
 309
 310         __ipsec_errcode = EIPSEC_NO_ERROR;
 311         return 0;
 312 }
 313
 314 static int
 315 set_x_request(struct sockaddr *src, struct sockaddr *dst)
 316 {
 317         struct sadb_x_ipsecrequest *p;
 318         int reqlen;
 319
 320         reqlen = sizeof(*p)
 321                 + (src ? src->sa_len : 0)
 322                 + (dst ? dst->sa_len : 0);
 323         tlen += reqlen;         /* increment to total length */
 324
 325         pbuf = realloc(pbuf, tlen);
 326         if (pbuf == NULL) {
 327                 __ipsec_errcode = EIPSEC_NO_BUFS;
 328                 return -1;
 329         }
 330         p = (struct sadb_x_ipsecrequest *)&pbuf[offset];
 331         p->sadb_x_ipsecrequest_len = reqlen;
 332         p->sadb_x_ipsecrequest_proto = p_protocol;
 333         p->sadb_x_ipsecrequest_mode = p_mode;
 334         p->sadb_x_ipsecrequest_level = p_level;
 335         p->sadb_x_ipsecrequest_reqid = p_reqid;
 336         offset += sizeof(*p);
 337
 338         if (set_sockaddr(src) || set_sockaddr(dst))
 339                 return -1;
 340
 341         __ipsec_errcode = EIPSEC_NO_ERROR;
 342         return 0;
 343 }
 344
 345 static int
 346 set_sockaddr(struct sockaddr *addr)
 347 {
 348         if (addr == NULL) {
 349                 __ipsec_errcode = EIPSEC_NO_ERROR;
 350                 return 0;
 351         }
 352
 353         /* tlen has already incremented */
 354
 355         memcpy(&pbuf[offset], addr, addr->sa_len);
 356
 357         offset += addr->sa_len;
 358
 359         __ipsec_errcode = EIPSEC_NO_ERROR;
 360         return 0;
 361 }
 362
 363 static void
 364 policy_parse_request_init(void)
 365 {
 366         p_protocol = IPPROTO_IP;
 367         p_mode = IPSEC_MODE_ANY;
 368         p_level = IPSEC_LEVEL_DEFAULT;
 369         p_reqid = 0;
 370         if (p_src != NULL) {
 371                 free(p_src);
 372                 p_src = NULL;
 373         }
 374         if (p_dst != NULL) {
 375                 free(p_dst);
 376                 p_dst = NULL;
 377         }
 378
 379         return;
 380 }
 381
 382 static caddr_t
 383 policy_parse(char *msg, int msglen)
 384 {
 385         int error;
 386         pbuf = NULL;
 387         tlen = 0;
 388
 389         /* initialize */
 390         p_dir = IPSEC_DIR_INVALID;
 391         p_type = IPSEC_POLICY_DISCARD;
 392         policy_parse_request_init();
 393         __policy__strbuffer__init__(msg);
 394
 395         error = yyparse();      /* it must be set errcode. */
 396         if (error) {
 397                 if (pbuf != NULL)
 398                         free(pbuf);
 399                 return NULL;
 400         }
 401
 402         /* update total length */
 403         ((struct sadb_x_policy *)pbuf)->sadb_x_policy_len = PFKEY_UNIT64(tlen);
 404
 405         __ipsec_errcode = EIPSEC_NO_ERROR;
 406
 407         return pbuf;
 408 }
 409
 410 caddr_t
 411 ipsec_set_policy(char *msg, int msglen)
 412 {
 413         caddr_t policy;
 414
 415         policy = policy_parse(msg, msglen);
 416         if (policy == NULL) {
 417                 if (__ipsec_errcode == EIPSEC_NO_ERROR)
 418                         __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
 419                 return NULL;
 420         }
 421
 422         __ipsec_errcode = EIPSEC_NO_ERROR;
 423         return policy;
 424 }
 425