1 /* 2 * Copyright (c) 1997 - 2006 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 "kadmin_locl.h" 35 #include <parse_units.h> 36 37 RCSID("$Id: util.c 21745 2007-07-31 16:11:25Z lha $"); 38 39 /* 40 * util.c - functions for parsing, unparsing, and editing different 41 * types of data used in kadmin. 42 */ 43 44 static int 45 get_response(const char *prompt, const char *def, char *buf, size_t len); 46 47 /* 48 * attributes 49 */ 50 51 struct units kdb_attrs[] = { 52 { "allow-digest", KRB5_KDB_ALLOW_DIGEST }, 53 { "allow-kerberos4", KRB5_KDB_ALLOW_KERBEROS4 }, 54 { "trusted-for-delegation", KRB5_KDB_TRUSTED_FOR_DELEGATION }, 55 { "ok-as-delegate", KRB5_KDB_OK_AS_DELEGATE }, 56 { "new-princ", KRB5_KDB_NEW_PRINC }, 57 { "support-desmd5", KRB5_KDB_SUPPORT_DESMD5 }, 58 { "pwchange-service", KRB5_KDB_PWCHANGE_SERVICE }, 59 { "disallow-svr", KRB5_KDB_DISALLOW_SVR }, 60 { "requires-pw-change", KRB5_KDB_REQUIRES_PWCHANGE }, 61 { "requires-hw-auth", KRB5_KDB_REQUIRES_HW_AUTH }, 62 { "requires-pre-auth", KRB5_KDB_REQUIRES_PRE_AUTH }, 63 { "disallow-all-tix", KRB5_KDB_DISALLOW_ALL_TIX }, 64 { "disallow-dup-skey", KRB5_KDB_DISALLOW_DUP_SKEY }, 65 { "disallow-proxiable", KRB5_KDB_DISALLOW_PROXIABLE }, 66 { "disallow-renewable", KRB5_KDB_DISALLOW_RENEWABLE }, 67 { "disallow-tgt-based", KRB5_KDB_DISALLOW_TGT_BASED }, 68 { "disallow-forwardable", KRB5_KDB_DISALLOW_FORWARDABLE }, 69 { "disallow-postdated", KRB5_KDB_DISALLOW_POSTDATED }, 70 { NULL } 71 }; 72 73 /* 74 * convert the attributes in `attributes' into a printable string 75 * in `str, len' 76 */ 77 78 void 79 attributes2str(krb5_flags attributes, char *str, size_t len) 80 { 81 unparse_flags (attributes, kdb_attrs, str, len); 82 } 83 84 /* 85 * convert the string in `str' into attributes in `flags' 86 * return 0 if parsed ok, else -1. 87 */ 88 89 int 90 str2attributes(const char *str, krb5_flags *flags) 91 { 92 int res; 93 94 res = parse_flags (str, kdb_attrs, *flags); 95 if (res < 0) 96 return res; 97 else { 98 *flags = res; 99 return 0; 100 } 101 } 102 103 /* 104 * try to parse the string `resp' into attributes in `attr', also 105 * setting the `bit' in `mask' if attributes are given and valid. 106 */ 107 108 int 109 parse_attributes (const char *resp, krb5_flags *attr, int *mask, int bit) 110 { 111 krb5_flags tmp = *attr; 112 113 if (str2attributes(resp, &tmp) == 0) { 114 *attr = tmp; 115 if (mask) 116 *mask |= bit; 117 return 0; 118 } else if(*resp == '?') { 119 print_flags_table (kdb_attrs, stderr); 120 } else { 121 fprintf (stderr, "Unable to parse \"%s\"\n", resp); 122 } 123 return -1; 124 } 125 126 /* 127 * allow the user to edit the attributes in `attr', prompting with `prompt' 128 */ 129 130 int 131 edit_attributes (const char *prompt, krb5_flags *attr, int *mask, int bit) 132 { 133 char buf[1024], resp[1024]; 134 135 if (mask && (*mask & bit)) 136 return 0; 137 138 attributes2str(*attr, buf, sizeof(buf)); 139 for (;;) { 140 if(get_response("Attributes", buf, resp, sizeof(resp)) != 0) 141 return 1; 142 if (resp[0] == '\0') 143 break; 144 if (parse_attributes (resp, attr, mask, bit) == 0) 145 break; 146 } 147 return 0; 148 } 149 150 /* 151 * time_t 152 * the special value 0 means ``never'' 153 */ 154 155 /* 156 * Convert the time `t' to a string representation in `str' (of max 157 * size `len'). If include_time also include time, otherwise just 158 * date. 159 */ 160 161 void 162 time_t2str(time_t t, char *str, size_t len, int include_time) 163 { 164 if(t) { 165 if(include_time) 166 strftime(str, len, "%Y-%m-%d %H:%M:%S UTC", gmtime(&t)); 167 else 168 strftime(str, len, "%Y-%m-%d", gmtime(&t)); 169 } else 170 snprintf(str, len, "never"); 171 } 172 173 /* 174 * Convert the time representation in `str' to a time in `time'. 175 * Return 0 if succesful, else -1. 176 */ 177 178 int 179 str2time_t (const char *str, time_t *t) 180 { 181 const char *p; 182 struct tm tm, tm2; 183 184 memset (&tm, 0, sizeof (tm)); 185 memset (&tm2, 0, sizeof (tm2)); 186 187 if(strcasecmp(str, "never") == 0) { 188 *t = 0; 189 return 0; 190 } 191 192 if(strcasecmp(str, "now") == 0) { 193 *t = time(NULL); 194 return 0; 195 } 196 197 p = strptime (str, "%Y-%m-%d", &tm); 198 199 if (p == NULL) 200 return -1; 201 202 while(isspace((unsigned char)*p)) 203 p++; 204 205 /* XXX this is really a bit optimistic, we should really complain 206 if there was a problem parsing the time */ 207 if(p[0] != '\0' && strptime (p, "%H:%M:%S", &tm2) != NULL) { 208 tm.tm_hour = tm2.tm_hour; 209 tm.tm_min = tm2.tm_min; 210 tm.tm_sec = tm2.tm_sec; 211 } else { 212 /* Do it on the end of the day */ 213 tm.tm_hour = 23; 214 tm.tm_min = 59; 215 tm.tm_sec = 59; 216 } 217 218 *t = tm2time (tm, 0); 219 return 0; 220 } 221 222 /* 223 * try to parse the time in `resp' storing it in `value' 224 */ 225 226 int 227 parse_timet (const char *resp, krb5_timestamp *value, int *mask, int bit) 228 { 229 time_t tmp; 230 231 if (str2time_t(resp, &tmp) == 0) { 232 *value = tmp; 233 if(mask) 234 *mask |= bit; 235 return 0; 236 } 237 if(*resp != '?') 238 fprintf (stderr, "Unable to parse time \"%s\"\n", resp); 239 fprintf (stderr, "Print date on format YYYY-mm-dd [hh:mm:ss]\n"); 240 return -1; 241 } 242 243 /* 244 * allow the user to edit the time in `value' 245 */ 246 247 int 248 edit_timet (const char *prompt, krb5_timestamp *value, int *mask, int bit) 249 { 250 char buf[1024], resp[1024]; 251 252 if (mask && (*mask & bit)) 253 return 0; 254 255 time_t2str (*value, buf, sizeof (buf), 0); 256 257 for (;;) { 258 if(get_response(prompt, buf, resp, sizeof(resp)) != 0) 259 return 1; 260 if (parse_timet (resp, value, mask, bit) == 0) 261 break; 262 } 263 return 0; 264 } 265 266 /* 267 * deltat 268 * the special value 0 means ``unlimited'' 269 */ 270 271 /* 272 * convert the delta_t value in `t' into a printable form in `str, len' 273 */ 274 275 void 276 deltat2str(unsigned t, char *str, size_t len) 277 { 278 if(t == 0 || t == INT_MAX) 279 snprintf(str, len, "unlimited"); 280 else 281 unparse_time(t, str, len); 282 } 283 284 /* 285 * parse the delta value in `str', storing result in `*delta' 286 * return 0 if ok, else -1 287 */ 288 289 int 290 str2deltat(const char *str, krb5_deltat *delta) 291 { 292 int res; 293 294 if(strcasecmp(str, "unlimited") == 0) { 295 *delta = 0; 296 return 0; 297 } 298 res = parse_time(str, "day"); 299 if (res < 0) 300 return res; 301 else { 302 *delta = res; 303 return 0; 304 } 305 } 306 307 /* 308 * try to parse the string in `resp' into a deltad in `value' 309 * `mask' will get the bit `bit' set if a value was given. 310 */ 311 312 int 313 parse_deltat (const char *resp, krb5_deltat *value, int *mask, int bit) 314 { 315 krb5_deltat tmp; 316 317 if (str2deltat(resp, &tmp) == 0) { 318 *value = tmp; 319 if (mask) 320 *mask |= bit; 321 return 0; 322 } else if(*resp == '?') { 323 print_time_table (stderr); 324 } else { 325 fprintf (stderr, "Unable to parse time \"%s\"\n", resp); 326 } 327 return -1; 328 } 329 330 /* 331 * allow the user to edit the deltat in `value' 332 */ 333 334 int 335 edit_deltat (const char *prompt, krb5_deltat *value, int *mask, int bit) 336 { 337 char buf[1024], resp[1024]; 338 339 if (mask && (*mask & bit)) 340 return 0; 341 342 deltat2str(*value, buf, sizeof(buf)); 343 for (;;) { 344 if(get_response(prompt, buf, resp, sizeof(resp)) != 0) 345 return 1; 346 if (parse_deltat (resp, value, mask, bit) == 0) 347 break; 348 } 349 return 0; 350 } 351 352 /* 353 * allow the user to edit `ent' 354 */ 355 356 void 357 set_defaults(kadm5_principal_ent_t ent, int *mask, 358 kadm5_principal_ent_t default_ent, int default_mask) 359 { 360 if (default_ent 361 && (default_mask & KADM5_MAX_LIFE) 362 && !(*mask & KADM5_MAX_LIFE)) 363 ent->max_life = default_ent->max_life; 364 365 if (default_ent 366 && (default_mask & KADM5_MAX_RLIFE) 367 && !(*mask & KADM5_MAX_RLIFE)) 368 ent->max_renewable_life = default_ent->max_renewable_life; 369 370 if (default_ent 371 && (default_mask & KADM5_PRINC_EXPIRE_TIME) 372 && !(*mask & KADM5_PRINC_EXPIRE_TIME)) 373 ent->princ_expire_time = default_ent->princ_expire_time; 374 375 if (default_ent 376 && (default_mask & KADM5_PW_EXPIRATION) 377 && !(*mask & KADM5_PW_EXPIRATION)) 378 ent->pw_expiration = default_ent->pw_expiration; 379 380 if (default_ent 381 && (default_mask & KADM5_ATTRIBUTES) 382 && !(*mask & KADM5_ATTRIBUTES)) 383 ent->attributes = default_ent->attributes & ~KRB5_KDB_DISALLOW_ALL_TIX; 384 } 385 386 int 387 edit_entry(kadm5_principal_ent_t ent, int *mask, 388 kadm5_principal_ent_t default_ent, int default_mask) 389 { 390 391 set_defaults(ent, mask, default_ent, default_mask); 392 393 if(edit_deltat ("Max ticket life", &ent->max_life, mask, 394 KADM5_MAX_LIFE) != 0) 395 return 1; 396 397 if(edit_deltat ("Max renewable life", &ent->max_renewable_life, mask, 398 KADM5_MAX_RLIFE) != 0) 399 return 1; 400 401 if(edit_timet ("Principal expiration time", &ent->princ_expire_time, mask, 402 KADM5_PRINC_EXPIRE_TIME) != 0) 403 return 1; 404 405 if(edit_timet ("Password expiration time", &ent->pw_expiration, mask, 406 KADM5_PW_EXPIRATION) != 0) 407 return 1; 408 409 if(edit_attributes ("Attributes", &ent->attributes, mask, 410 KADM5_ATTRIBUTES) != 0) 411 return 1; 412 413 return 0; 414 } 415 416 /* 417 * Parse the arguments, set the fields in `ent' and the `mask' for the 418 * entries having been set. 419 * Return 1 on failure and 0 on success. 420 */ 421 422 int 423 set_entry(krb5_context context, 424 kadm5_principal_ent_t ent, 425 int *mask, 426 const char *max_ticket_life, 427 const char *max_renewable_life, 428 const char *expiration, 429 const char *pw_expiration, 430 const char *attributes) 431 { 432 if (max_ticket_life != NULL) { 433 if (parse_deltat (max_ticket_life, &ent->max_life, 434 mask, KADM5_MAX_LIFE)) { 435 krb5_warnx (context, "unable to parse `%s'", max_ticket_life); 436 return 1; 437 } 438 } 439 if (max_renewable_life != NULL) { 440 if (parse_deltat (max_renewable_life, &ent->max_renewable_life, 441 mask, KADM5_MAX_RLIFE)) { 442 krb5_warnx (context, "unable to parse `%s'", max_renewable_life); 443 return 1; 444 } 445 } 446 447 if (expiration) { 448 if (parse_timet (expiration, &ent->princ_expire_time, 449 mask, KADM5_PRINC_EXPIRE_TIME)) { 450 krb5_warnx (context, "unable to parse `%s'", expiration); 451 return 1; 452 } 453 } 454 if (pw_expiration) { 455 if (parse_timet (pw_expiration, &ent->pw_expiration, 456 mask, KADM5_PW_EXPIRATION)) { 457 krb5_warnx (context, "unable to parse `%s'", pw_expiration); 458 return 1; 459 } 460 } 461 if (attributes != NULL) { 462 if (parse_attributes (attributes, &ent->attributes, 463 mask, KADM5_ATTRIBUTES)) { 464 krb5_warnx (context, "unable to parse `%s'", attributes); 465 return 1; 466 } 467 } 468 return 0; 469 } 470 471 /* 472 * Does `string' contain any globing characters? 473 */ 474 475 static int 476 is_expression(const char *string) 477 { 478 const char *p; 479 int quote = 0; 480 481 for(p = string; *p; p++) { 482 if(quote) { 483 quote = 0; 484 continue; 485 } 486 if(*p == '\\') 487 quote++; 488 else if(strchr("[]*?", *p) != NULL) 489 return 1; 490 } 491 return 0; 492 } 493 494 /* 495 * Loop over all principals matching exp. If any of calls to `func' 496 * failes, the first error is returned when all principals are 497 * processed. 498 */ 499 int 500 foreach_principal(const char *exp_str, 501 int (*func)(krb5_principal, void*), 502 const char *funcname, 503 void *data) 504 { 505 char **princs; 506 int num_princs; 507 int i; 508 krb5_error_code saved_ret = 0, ret = 0; 509 krb5_principal princ_ent; 510 int is_expr; 511 512 /* if this isn't an expression, there is no point in wading 513 through the whole database looking for matches */ 514 is_expr = is_expression(exp_str); 515 if(is_expr) 516 ret = kadm5_get_principals(kadm_handle, exp_str, &princs, &num_princs); 517 if(!is_expr || ret == KADM5_AUTH_LIST) { 518 /* we might be able to perform the requested opreration even 519 if we're not allowed to list principals */ 520 num_princs = 1; 521 princs = malloc(sizeof(*princs)); 522 if(princs == NULL) 523 return ENOMEM; 524 princs[0] = strdup(exp_str); 525 if(princs[0] == NULL){ 526 free(princs); 527 return ENOMEM; 528 } 529 } else if(ret) { 530 krb5_warn(context, ret, "kadm5_get_principals"); 531 return ret; 532 } 533 for(i = 0; i < num_princs; i++) { 534 ret = krb5_parse_name(context, princs[i], &princ_ent); 535 if(ret){ 536 krb5_warn(context, ret, "krb5_parse_name(%s)", princs[i]); 537 continue; 538 } 539 ret = (*func)(princ_ent, data); 540 if(ret) { 541 krb5_clear_error_string(context); 542 krb5_warn(context, ret, "%s %s", funcname, princs[i]); 543 if (saved_ret == 0) 544 saved_ret = ret; 545 } 546 krb5_free_principal(context, princ_ent); 547 } 548 if (ret == 0 && saved_ret != 0) 549 ret = saved_ret; 550 kadm5_free_name_list(kadm_handle, princs, &num_princs); 551 return ret; 552 } 553 554 /* 555 * prompt with `prompt' and default value `def', and store the reply 556 * in `buf, len' 557 */ 558 559 #include <setjmp.h> 560 561 static jmp_buf jmpbuf; 562 563 static void 564 interrupt(int sig) 565 { 566 longjmp(jmpbuf, 1); 567 } 568 569 static int 570 get_response(const char *prompt, const char *def, char *buf, size_t len) 571 { 572 char *p; 573 void (*osig)(int); 574 575 osig = signal(SIGINT, interrupt); 576 if(setjmp(jmpbuf)) { 577 signal(SIGINT, osig); 578 fprintf(stderr, "\n"); 579 return 1; 580 } 581 582 fprintf(stderr, "%s [%s]:", prompt, def); 583 if(fgets(buf, len, stdin) == NULL) { 584 int save_errno = errno; 585 if(ferror(stdin)) 586 krb5_err(context, 1, save_errno, "<stdin>"); 587 signal(SIGINT, osig); 588 return 1; 589 } 590 p = strchr(buf, '\n'); 591 if(p) 592 *p = '\0'; 593 if(strcmp(buf, "") == 0) 594 strlcpy(buf, def, len); 595 signal(SIGINT, osig); 596 return 0; 597 } 598 599 /* 600 * return [0, 16) or -1 601 */ 602 603 static int 604 hex2n (char c) 605 { 606 static char hexdigits[] = "0123456789abcdef"; 607 const char *p; 608 609 p = strchr (hexdigits, tolower((unsigned char)c)); 610 if (p == NULL) 611 return -1; 612 else 613 return p - hexdigits; 614 } 615 616 /* 617 * convert a key in a readable format into a keyblock. 618 * return 0 iff succesful, otherwise `err' should point to an error message 619 */ 620 621 int 622 parse_des_key (const char *key_string, krb5_key_data *key_data, 623 const char **error) 624 { 625 const char *p = key_string; 626 unsigned char bits[8]; 627 int i; 628 629 if (strlen (key_string) != 16) { 630 *error = "bad length, should be 16 for DES key"; 631 return 1; 632 } 633 for (i = 0; i < 8; ++i) { 634 int d1, d2; 635 636 d1 = hex2n(p[2 * i]); 637 d2 = hex2n(p[2 * i + 1]); 638 if (d1 < 0 || d2 < 0) { 639 *error = "non-hex character"; 640 return 1; 641 } 642 bits[i] = (d1 << 4) | d2; 643 } 644 for (i = 0; i < 3; ++i) { 645 key_data[i].key_data_ver = 2; 646 key_data[i].key_data_kvno = 0; 647 /* key */ 648 key_data[i].key_data_type[0] = ETYPE_DES_CBC_CRC; 649 key_data[i].key_data_length[0] = 8; 650 key_data[i].key_data_contents[0] = malloc(8); 651 if (key_data[i].key_data_contents[0] == NULL) { 652 *error = "malloc"; 653 return ENOMEM; 654 } 655 memcpy (key_data[i].key_data_contents[0], bits, 8); 656 /* salt */ 657 key_data[i].key_data_type[1] = KRB5_PW_SALT; 658 key_data[i].key_data_length[1] = 0; 659 key_data[i].key_data_contents[1] = NULL; 660 } 661 key_data[0].key_data_type[0] = ETYPE_DES_CBC_MD5; 662 key_data[1].key_data_type[0] = ETYPE_DES_CBC_MD4; 663 return 0; 664 } 665