1 /* 2 * Copyright (c) 1997 - 2001 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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 "krb5_locl.h" 35 36 RCSID("$Id: keytab_file.c,v 1.8 2001/05/14 06:14:48 assar Exp $"); 37 38 #define KRB5_KT_VNO_1 1 39 #define KRB5_KT_VNO_2 2 40 #define KRB5_KT_VNO KRB5_KT_VNO_2 41 42 /* file operations -------------------------------------------- */ 43 44 struct fkt_data { 45 char *filename; 46 }; 47 48 static krb5_error_code 49 krb5_kt_ret_data(krb5_context context, 50 krb5_storage *sp, 51 krb5_data *data) 52 { 53 int ret; 54 int16_t size; 55 ret = krb5_ret_int16(sp, &size); 56 if(ret) 57 return ret; 58 data->length = size; 59 data->data = malloc(size); 60 if (data->data == NULL) { 61 krb5_set_error_string (context, "malloc: out of memory"); 62 return ENOMEM; 63 } 64 ret = sp->fetch(sp, data->data, size); 65 if(ret != size) 66 return (ret < 0)? errno : KRB5_KT_END; 67 return 0; 68 } 69 70 static krb5_error_code 71 krb5_kt_ret_string(krb5_context context, 72 krb5_storage *sp, 73 general_string *data) 74 { 75 int ret; 76 int16_t size; 77 ret = krb5_ret_int16(sp, &size); 78 if(ret) 79 return ret; 80 *data = malloc(size + 1); 81 if (*data == NULL) { 82 krb5_set_error_string (context, "malloc: out of memory"); 83 return ENOMEM; 84 } 85 ret = sp->fetch(sp, *data, size); 86 (*data)[size] = '\0'; 87 if(ret != size) 88 return (ret < 0)? errno : KRB5_KT_END; 89 return 0; 90 } 91 92 static krb5_error_code 93 krb5_kt_store_data(krb5_context context, 94 krb5_storage *sp, 95 krb5_data data) 96 { 97 int ret; 98 ret = krb5_store_int16(sp, data.length); 99 if(ret < 0) 100 return ret; 101 ret = sp->store(sp, data.data, data.length); 102 if(ret != data.length){ 103 if(ret < 0) 104 return errno; 105 return KRB5_KT_END; 106 } 107 return 0; 108 } 109 110 static krb5_error_code 111 krb5_kt_store_string(krb5_storage *sp, 112 general_string data) 113 { 114 int ret; 115 size_t len = strlen(data); 116 ret = krb5_store_int16(sp, len); 117 if(ret < 0) 118 return ret; 119 ret = sp->store(sp, data, len); 120 if(ret != len){ 121 if(ret < 0) 122 return errno; 123 return KRB5_KT_END; 124 } 125 return 0; 126 } 127 128 static krb5_error_code 129 krb5_kt_ret_keyblock(krb5_context context, krb5_storage *sp, krb5_keyblock *p) 130 { 131 int ret; 132 int16_t tmp; 133 134 ret = krb5_ret_int16(sp, &tmp); /* keytype + etype */ 135 if(ret) return ret; 136 p->keytype = tmp; 137 ret = krb5_kt_ret_data(context, sp, &p->keyvalue); 138 return ret; 139 } 140 141 static krb5_error_code 142 krb5_kt_store_keyblock(krb5_context context, 143 krb5_storage *sp, 144 krb5_keyblock *p) 145 { 146 int ret; 147 148 ret = krb5_store_int16(sp, p->keytype); /* keytype + etype */ 149 if(ret) return ret; 150 ret = krb5_kt_store_data(context, sp, p->keyvalue); 151 return ret; 152 } 153 154 155 static krb5_error_code 156 krb5_kt_ret_principal(krb5_context context, 157 krb5_storage *sp, 158 krb5_principal *princ) 159 { 160 int i; 161 int ret; 162 krb5_principal p; 163 int16_t tmp; 164 165 ALLOC(p, 1); 166 if(p == NULL) { 167 krb5_set_error_string (context, "malloc: out of memory"); 168 return ENOMEM; 169 } 170 171 ret = krb5_ret_int16(sp, &tmp); 172 if(ret) 173 return ret; 174 if (sp->flags & KRB5_STORAGE_PRINCIPAL_WRONG_NUM_COMPONENTS) 175 tmp--; 176 p->name.name_string.len = tmp; 177 ret = krb5_kt_ret_string(context, sp, &p->realm); 178 if(ret) 179 return ret; 180 p->name.name_string.val = calloc(p->name.name_string.len, 181 sizeof(*p->name.name_string.val)); 182 if(p->name.name_string.val == NULL) { 183 krb5_set_error_string (context, "malloc: out of memory"); 184 return ENOMEM; 185 } 186 for(i = 0; i < p->name.name_string.len; i++){ 187 ret = krb5_kt_ret_string(context, sp, p->name.name_string.val + i); 188 if(ret) 189 return ret; 190 } 191 if (krb5_storage_is_flags(sp, KRB5_STORAGE_PRINCIPAL_NO_NAME_TYPE)) 192 p->name.name_type = KRB5_NT_UNKNOWN; 193 else { 194 int32_t tmp32; 195 ret = krb5_ret_int32(sp, &tmp32); 196 p->name.name_type = tmp32; 197 if (ret) 198 return ret; 199 } 200 *princ = p; 201 return 0; 202 } 203 204 static krb5_error_code 205 krb5_kt_store_principal(krb5_context context, 206 krb5_storage *sp, 207 krb5_principal p) 208 { 209 int i; 210 int ret; 211 212 if(krb5_storage_is_flags(sp, KRB5_STORAGE_PRINCIPAL_WRONG_NUM_COMPONENTS)) 213 ret = krb5_store_int16(sp, p->name.name_string.len + 1); 214 else 215 ret = krb5_store_int16(sp, p->name.name_string.len); 216 if(ret) return ret; 217 ret = krb5_kt_store_string(sp, p->realm); 218 if(ret) return ret; 219 for(i = 0; i < p->name.name_string.len; i++){ 220 ret = krb5_kt_store_string(sp, p->name.name_string.val[i]); 221 if(ret) 222 return ret; 223 } 224 if(!krb5_storage_is_flags(sp, KRB5_STORAGE_PRINCIPAL_NO_NAME_TYPE)) { 225 ret = krb5_store_int32(sp, p->name.name_type); 226 if(ret) 227 return ret; 228 } 229 230 return 0; 231 } 232 233 static krb5_error_code 234 fkt_resolve(krb5_context context, const char *name, krb5_keytab id) 235 { 236 struct fkt_data *d; 237 238 d = malloc(sizeof(*d)); 239 if(d == NULL) { 240 krb5_set_error_string (context, "malloc: out of memory"); 241 return ENOMEM; 242 } 243 d->filename = strdup(name); 244 if(d->filename == NULL) { 245 free(d); 246 krb5_set_error_string (context, "malloc: out of memory"); 247 return ENOMEM; 248 } 249 id->data = d; 250 return 0; 251 } 252 253 static krb5_error_code 254 fkt_close(krb5_context context, krb5_keytab id) 255 { 256 struct fkt_data *d = id->data; 257 free(d->filename); 258 free(d); 259 return 0; 260 } 261 262 static krb5_error_code 263 fkt_get_name(krb5_context context, 264 krb5_keytab id, 265 char *name, 266 size_t namesize) 267 { 268 /* This function is XXX */ 269 struct fkt_data *d = id->data; 270 strlcpy(name, d->filename, namesize); 271 return 0; 272 } 273 274 static void 275 storage_set_flags(krb5_context context, krb5_storage *sp, int vno) 276 { 277 int flags = 0; 278 switch(vno) { 279 case KRB5_KT_VNO_1: 280 flags |= KRB5_STORAGE_PRINCIPAL_WRONG_NUM_COMPONENTS; 281 flags |= KRB5_STORAGE_PRINCIPAL_NO_NAME_TYPE; 282 flags |= KRB5_STORAGE_HOST_BYTEORDER; 283 break; 284 case KRB5_KT_VNO_2: 285 break; 286 default: 287 krb5_abortx(context, 288 "storage_set_flags called with bad vno (%x)", vno); 289 } 290 krb5_storage_set_flags(sp, flags); 291 } 292 293 static krb5_error_code 294 fkt_start_seq_get_int(krb5_context context, 295 krb5_keytab id, 296 int flags, 297 krb5_kt_cursor *c) 298 { 299 int8_t pvno, tag; 300 krb5_error_code ret; 301 struct fkt_data *d = id->data; 302 303 c->fd = open (d->filename, flags); 304 if (c->fd < 0) { 305 ret = errno; 306 krb5_set_error_string(context, "open(%s): %s", d->filename, 307 strerror(ret)); 308 return ret; 309 } 310 c->sp = krb5_storage_from_fd(c->fd); 311 ret = krb5_ret_int8(c->sp, &pvno); 312 if(ret) { 313 krb5_storage_free(c->sp); 314 close(c->fd); 315 return ret; 316 } 317 if(pvno != 5) { 318 krb5_storage_free(c->sp); 319 close(c->fd); 320 krb5_clear_error_string (context); 321 return KRB5_KEYTAB_BADVNO; 322 } 323 ret = krb5_ret_int8(c->sp, &tag); 324 if (ret) { 325 krb5_storage_free(c->sp); 326 close(c->fd); 327 return ret; 328 } 329 id->version = tag; 330 storage_set_flags(context, c->sp, id->version); 331 return 0; 332 } 333 334 static krb5_error_code 335 fkt_start_seq_get(krb5_context context, 336 krb5_keytab id, 337 krb5_kt_cursor *c) 338 { 339 return fkt_start_seq_get_int(context, id, O_RDONLY | O_BINARY, c); 340 } 341 342 static krb5_error_code 343 fkt_next_entry_int(krb5_context context, 344 krb5_keytab id, 345 krb5_keytab_entry *entry, 346 krb5_kt_cursor *cursor, 347 off_t *start, 348 off_t *end) 349 { 350 int32_t len; 351 int ret; 352 int8_t tmp8; 353 int32_t tmp32; 354 off_t pos; 355 356 pos = cursor->sp->seek(cursor->sp, 0, SEEK_CUR); 357 loop: 358 ret = krb5_ret_int32(cursor->sp, &len); 359 if (ret) 360 return ret; 361 if(len < 0) { 362 pos = cursor->sp->seek(cursor->sp, -len, SEEK_CUR); 363 goto loop; 364 } 365 ret = krb5_kt_ret_principal (context, cursor->sp, &entry->principal); 366 if (ret) 367 goto out; 368 ret = krb5_ret_int32(cursor->sp, &tmp32); 369 entry->timestamp = tmp32; 370 if (ret) 371 goto out; 372 ret = krb5_ret_int8(cursor->sp, &tmp8); 373 if (ret) 374 goto out; 375 entry->vno = tmp8; 376 ret = krb5_kt_ret_keyblock (context, cursor->sp, &entry->keyblock); 377 if (ret) 378 goto out; 379 if(start) *start = pos; 380 if(end) *end = *start + 4 + len; 381 out: 382 cursor->sp->seek(cursor->sp, pos + 4 + len, SEEK_SET); 383 return ret; 384 } 385 386 static krb5_error_code 387 fkt_next_entry(krb5_context context, 388 krb5_keytab id, 389 krb5_keytab_entry *entry, 390 krb5_kt_cursor *cursor) 391 { 392 return fkt_next_entry_int(context, id, entry, cursor, NULL, NULL); 393 } 394 395 static krb5_error_code 396 fkt_end_seq_get(krb5_context context, 397 krb5_keytab id, 398 krb5_kt_cursor *cursor) 399 { 400 krb5_storage_free(cursor->sp); 401 close(cursor->fd); 402 return 0; 403 } 404 405 static krb5_error_code 406 fkt_add_entry(krb5_context context, 407 krb5_keytab id, 408 krb5_keytab_entry *entry) 409 { 410 int ret; 411 int fd; 412 krb5_storage *sp; 413 struct fkt_data *d = id->data; 414 krb5_data keytab; 415 int32_t len; 416 417 fd = open (d->filename, O_RDWR | O_BINARY); 418 if (fd < 0) { 419 fd = open (d->filename, O_RDWR | O_CREAT | O_BINARY, 0600); 420 if (fd < 0) { 421 ret = errno; 422 krb5_set_error_string(context, "open(%s): %s", d->filename, 423 strerror(ret)); 424 return ret; 425 } 426 sp = krb5_storage_from_fd(fd); 427 ret = krb5_store_int8(sp, 5); 428 if(ret) { 429 krb5_storage_free(sp); 430 close(fd); 431 return ret; 432 } 433 if(id->version == 0) 434 id->version = KRB5_KT_VNO; 435 ret = krb5_store_int8 (sp, id->version); 436 if (ret) { 437 krb5_storage_free(sp); 438 close(fd); 439 return ret; 440 } 441 storage_set_flags(context, sp, id->version); 442 } else { 443 int8_t pvno, tag; 444 sp = krb5_storage_from_fd(fd); 445 ret = krb5_ret_int8(sp, &pvno); 446 if(ret) { 447 krb5_storage_free(sp); 448 close(fd); 449 return ret; 450 } 451 if(pvno != 5) { 452 krb5_storage_free(sp); 453 close(fd); 454 krb5_clear_error_string (context); 455 return KRB5_KEYTAB_BADVNO; 456 } 457 ret = krb5_ret_int8 (sp, &tag); 458 if (ret) { 459 krb5_storage_free(sp); 460 close(fd); 461 return ret; 462 } 463 id->version = tag; 464 storage_set_flags(context, sp, id->version); 465 } 466 467 { 468 krb5_storage *emem; 469 emem = krb5_storage_emem(); 470 if(emem == NULL) { 471 ret = ENOMEM; 472 krb5_set_error_string (context, "malloc: out of memory"); 473 goto out; 474 } 475 ret = krb5_kt_store_principal(context, emem, entry->principal); 476 if(ret) { 477 krb5_storage_free(emem); 478 goto out; 479 } 480 ret = krb5_store_int32 (emem, entry->timestamp); 481 if(ret) { 482 krb5_storage_free(emem); 483 goto out; 484 } 485 ret = krb5_store_int8 (emem, entry->vno); 486 if(ret) { 487 krb5_storage_free(emem); 488 goto out; 489 } 490 ret = krb5_kt_store_keyblock (context, emem, &entry->keyblock); 491 if(ret) { 492 krb5_storage_free(emem); 493 goto out; 494 } 495 ret = krb5_storage_to_data(emem, &keytab); 496 krb5_storage_free(emem); 497 if(ret) 498 goto out; 499 } 500 501 while(1) { 502 ret = krb5_ret_int32(sp, &len); 503 if(ret == KRB5_CC_END) { 504 len = keytab.length; 505 break; 506 } 507 if(len < 0) { 508 len = -len; 509 if(len >= keytab.length) { 510 sp->seek(sp, -4, SEEK_CUR); 511 break; 512 } 513 } 514 sp->seek(sp, len, SEEK_CUR); 515 } 516 ret = krb5_store_int32(sp, len); 517 if(sp->store(sp, keytab.data, keytab.length) < 0) 518 ret = errno; 519 memset(keytab.data, 0, keytab.length); 520 krb5_data_free(&keytab); 521 out: 522 krb5_storage_free(sp); 523 close(fd); 524 return ret; 525 } 526 527 static krb5_error_code 528 fkt_remove_entry(krb5_context context, 529 krb5_keytab id, 530 krb5_keytab_entry *entry) 531 { 532 krb5_keytab_entry e; 533 krb5_kt_cursor cursor; 534 off_t pos_start, pos_end; 535 int found = 0; 536 537 fkt_start_seq_get_int(context, id, O_RDWR | O_BINARY, &cursor); 538 while(fkt_next_entry_int(context, id, &e, &cursor, 539 &pos_start, &pos_end) == 0) { 540 if(krb5_kt_compare(context, &e, entry->principal, 541 entry->vno, entry->keyblock.keytype)) { 542 int32_t len; 543 unsigned char buf[128]; 544 found = 1; 545 cursor.sp->seek(cursor.sp, pos_start, SEEK_SET); 546 len = pos_end - pos_start - 4; 547 krb5_store_int32(cursor.sp, -len); 548 memset(buf, 0, sizeof(buf)); 549 while(len > 0) { 550 cursor.sp->store(cursor.sp, buf, min(len, sizeof(buf))); 551 len -= min(len, sizeof(buf)); 552 } 553 } 554 } 555 krb5_kt_end_seq_get(context, id, &cursor); 556 if (!found) { 557 krb5_clear_error_string (context); 558 return KRB5_KT_NOTFOUND; 559 } 560 return 0; 561 } 562 563 const krb5_kt_ops krb5_fkt_ops = { 564 "FILE", 565 fkt_resolve, 566 fkt_get_name, 567 fkt_close, 568 NULL, /* get */ 569 fkt_start_seq_get, 570 fkt_next_entry, 571 fkt_end_seq_get, 572 fkt_add_entry, 573 fkt_remove_entry 574 }; 575