1 /* $NetBSD: util.c,v 1.3 2014/04/24 13:45:33 pettai Exp $ */ 2 3 /* 4 * Copyright (c) 1997 - 2006 Kungliga Tekniska Högskolan 5 * (Royal Institute of Technology, Stockholm, Sweden). 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * 3. Neither the name of the Institute nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include "kadmin_locl.h" 37 #include <krb5/parse_units.h> 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, 0 } 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 while(isspace((unsigned char)*str)) 188 str++; 189 190 if (str[0] == '+') { 191 str++; 192 *t = parse_time(str, "month"); 193 if (*t < 0) 194 return -1; 195 *t += time(NULL); 196 return 0; 197 } 198 199 if(strcasecmp(str, "never") == 0) { 200 *t = 0; 201 return 0; 202 } 203 204 if(strcasecmp(str, "now") == 0) { 205 *t = time(NULL); 206 return 0; 207 } 208 209 p = strptime (str, "%Y-%m-%d", &tm); 210 211 if (p == NULL) 212 return -1; 213 214 while(isspace((unsigned char)*p)) 215 p++; 216 217 /* XXX this is really a bit optimistic, we should really complain 218 if there was a problem parsing the time */ 219 if(p[0] != '\0' && strptime (p, "%H:%M:%S", &tm2) != NULL) { 220 tm.tm_hour = tm2.tm_hour; 221 tm.tm_min = tm2.tm_min; 222 tm.tm_sec = tm2.tm_sec; 223 } else { 224 /* Do it on the end of the day */ 225 tm.tm_hour = 23; 226 tm.tm_min = 59; 227 tm.tm_sec = 59; 228 } 229 230 *t = tm2time (tm, 0); 231 return 0; 232 } 233 234 /* 235 * try to parse the time in `resp' storing it in `value' 236 */ 237 238 int 239 parse_timet (const char *resp, krb5_timestamp *value, int *mask, int bit) 240 { 241 time_t tmp; 242 243 if (str2time_t(resp, &tmp) == 0) { 244 *value = tmp; 245 if(mask) 246 *mask |= bit; 247 return 0; 248 } 249 if(*resp != '?') 250 fprintf (stderr, "Unable to parse time \"%s\"\n", resp); 251 fprintf (stderr, "Print date on format YYYY-mm-dd [hh:mm:ss]\n"); 252 return -1; 253 } 254 255 /* 256 * allow the user to edit the time in `value' 257 */ 258 259 int 260 edit_timet (const char *prompt, krb5_timestamp *value, int *mask, int bit) 261 { 262 char buf[1024], resp[1024]; 263 264 if (mask && (*mask & bit)) 265 return 0; 266 267 time_t2str (*value, buf, sizeof (buf), 0); 268 269 for (;;) { 270 if(get_response(prompt, buf, resp, sizeof(resp)) != 0) 271 return 1; 272 if (parse_timet (resp, value, mask, bit) == 0) 273 break; 274 } 275 return 0; 276 } 277 278 /* 279 * deltat 280 * the special value 0 means ``unlimited'' 281 */ 282 283 /* 284 * convert the delta_t value in `t' into a printable form in `str, len' 285 */ 286 287 void 288 deltat2str(unsigned t, char *str, size_t len) 289 { 290 if(t == 0 || t == INT_MAX) 291 snprintf(str, len, "unlimited"); 292 else 293 unparse_time(t, str, len); 294 } 295 296 /* 297 * parse the delta value in `str', storing result in `*delta' 298 * return 0 if ok, else -1 299 */ 300 301 int 302 str2deltat(const char *str, krb5_deltat *delta) 303 { 304 int res; 305 306 if(strcasecmp(str, "unlimited") == 0) { 307 *delta = 0; 308 return 0; 309 } 310 res = parse_time(str, "day"); 311 if (res < 0) 312 return res; 313 else { 314 *delta = res; 315 return 0; 316 } 317 } 318 319 /* 320 * try to parse the string in `resp' into a deltad in `value' 321 * `mask' will get the bit `bit' set if a value was given. 322 */ 323 324 int 325 parse_deltat (const char *resp, krb5_deltat *value, int *mask, int bit) 326 { 327 krb5_deltat tmp; 328 329 if (str2deltat(resp, &tmp) == 0) { 330 *value = tmp; 331 if (mask) 332 *mask |= bit; 333 return 0; 334 } else if(*resp == '?') { 335 print_time_table (stderr); 336 } else { 337 fprintf (stderr, "Unable to parse time \"%s\"\n", resp); 338 } 339 return -1; 340 } 341 342 /* 343 * allow the user to edit the deltat in `value' 344 */ 345 346 int 347 edit_deltat (const char *prompt, krb5_deltat *value, int *mask, int bit) 348 { 349 char buf[1024], resp[1024]; 350 351 if (mask && (*mask & bit)) 352 return 0; 353 354 deltat2str(*value, buf, sizeof(buf)); 355 for (;;) { 356 if(get_response(prompt, buf, resp, sizeof(resp)) != 0) 357 return 1; 358 if (parse_deltat (resp, value, mask, bit) == 0) 359 break; 360 } 361 return 0; 362 } 363 364 /* 365 * allow the user to edit `ent' 366 */ 367 368 void 369 set_defaults(kadm5_principal_ent_t ent, int *mask, 370 kadm5_principal_ent_t default_ent, int default_mask) 371 { 372 if (default_ent 373 && (default_mask & KADM5_MAX_LIFE) 374 && !(*mask & KADM5_MAX_LIFE)) 375 ent->max_life = default_ent->max_life; 376 377 if (default_ent 378 && (default_mask & KADM5_MAX_RLIFE) 379 && !(*mask & KADM5_MAX_RLIFE)) 380 ent->max_renewable_life = default_ent->max_renewable_life; 381 382 if (default_ent 383 && (default_mask & KADM5_PRINC_EXPIRE_TIME) 384 && !(*mask & KADM5_PRINC_EXPIRE_TIME)) 385 ent->princ_expire_time = default_ent->princ_expire_time; 386 387 if (default_ent 388 && (default_mask & KADM5_PW_EXPIRATION) 389 && !(*mask & KADM5_PW_EXPIRATION)) 390 ent->pw_expiration = default_ent->pw_expiration; 391 392 if (default_ent 393 && (default_mask & KADM5_ATTRIBUTES) 394 && !(*mask & KADM5_ATTRIBUTES)) 395 ent->attributes = default_ent->attributes & ~KRB5_KDB_DISALLOW_ALL_TIX; 396 } 397 398 int 399 edit_entry(kadm5_principal_ent_t ent, int *mask, 400 kadm5_principal_ent_t default_ent, int default_mask) 401 { 402 403 set_defaults(ent, mask, default_ent, default_mask); 404 405 if(edit_deltat ("Max ticket life", &ent->max_life, mask, 406 KADM5_MAX_LIFE) != 0) 407 return 1; 408 409 if(edit_deltat ("Max renewable life", &ent->max_renewable_life, mask, 410 KADM5_MAX_RLIFE) != 0) 411 return 1; 412 413 if(edit_timet ("Principal expiration time", &ent->princ_expire_time, mask, 414 KADM5_PRINC_EXPIRE_TIME) != 0) 415 return 1; 416 417 if(edit_timet ("Password expiration time", &ent->pw_expiration, mask, 418 KADM5_PW_EXPIRATION) != 0) 419 return 1; 420 421 if(edit_attributes ("Attributes", &ent->attributes, mask, 422 KADM5_ATTRIBUTES) != 0) 423 return 1; 424 425 return 0; 426 } 427 428 /* 429 * Parse the arguments, set the fields in `ent' and the `mask' for the 430 * entries having been set. 431 * Return 1 on failure and 0 on success. 432 */ 433 434 int 435 set_entry(krb5_context contextp, 436 kadm5_principal_ent_t ent, 437 int *mask, 438 const char *max_ticket_life, 439 const char *max_renewable_life, 440 const char *expiration, 441 const char *pw_expiration, 442 const char *attributes) 443 { 444 if (max_ticket_life != NULL) { 445 if (parse_deltat (max_ticket_life, &ent->max_life, 446 mask, KADM5_MAX_LIFE)) { 447 krb5_warnx (contextp, "unable to parse `%s'", max_ticket_life); 448 return 1; 449 } 450 } 451 if (max_renewable_life != NULL) { 452 if (parse_deltat (max_renewable_life, &ent->max_renewable_life, 453 mask, KADM5_MAX_RLIFE)) { 454 krb5_warnx (contextp, "unable to parse `%s'", max_renewable_life); 455 return 1; 456 } 457 } 458 459 if (expiration) { 460 if (parse_timet (expiration, &ent->princ_expire_time, 461 mask, KADM5_PRINC_EXPIRE_TIME)) { 462 krb5_warnx (contextp, "unable to parse `%s'", expiration); 463 return 1; 464 } 465 } 466 if (pw_expiration) { 467 if (parse_timet (pw_expiration, &ent->pw_expiration, 468 mask, KADM5_PW_EXPIRATION)) { 469 krb5_warnx (contextp, "unable to parse `%s'", pw_expiration); 470 return 1; 471 } 472 } 473 if (attributes != NULL) { 474 if (parse_attributes (attributes, &ent->attributes, 475 mask, KADM5_ATTRIBUTES)) { 476 krb5_warnx (contextp, "unable to parse `%s'", attributes); 477 return 1; 478 } 479 } 480 return 0; 481 } 482 483 /* 484 * Does `string' contain any globing characters? 485 */ 486 487 static int 488 is_expression(const char *string) 489 { 490 const char *p; 491 int quote = 0; 492 493 for(p = string; *p; p++) { 494 if(quote) { 495 quote = 0; 496 continue; 497 } 498 if(*p == '\\') 499 quote++; 500 else if(strchr("[]*?", *p) != NULL) 501 return 1; 502 } 503 return 0; 504 } 505 506 /* 507 * Loop over all principals matching exp. If any of calls to `func' 508 * failes, the first error is returned when all principals are 509 * processed. 510 */ 511 int 512 foreach_principal(const char *exp_str, 513 int (*func)(krb5_principal, void*), 514 const char *funcname, 515 void *data) 516 { 517 char **princs = NULL; 518 int num_princs = 0; 519 int i; 520 krb5_error_code saved_ret = 0, ret = 0; 521 krb5_principal princ_ent; 522 int is_expr; 523 524 /* if this isn't an expression, there is no point in wading 525 through the whole database looking for matches */ 526 is_expr = is_expression(exp_str); 527 if(is_expr) 528 ret = kadm5_get_principals(kadm_handle, exp_str, &princs, &num_princs); 529 if(!is_expr || ret == KADM5_AUTH_LIST) { 530 /* we might be able to perform the requested opreration even 531 if we're not allowed to list principals */ 532 num_princs = 1; 533 princs = malloc(sizeof(*princs)); 534 if(princs == NULL) 535 return ENOMEM; 536 princs[0] = strdup(exp_str); 537 if(princs[0] == NULL){ 538 free(princs); 539 return ENOMEM; 540 } 541 } else if(ret) { 542 krb5_warn(context, ret, "kadm5_get_principals"); 543 return ret; 544 } 545 for(i = 0; i < num_princs; i++) { 546 ret = krb5_parse_name(context, princs[i], &princ_ent); 547 if(ret){ 548 krb5_warn(context, ret, "krb5_parse_name(%s)", princs[i]); 549 continue; 550 } 551 ret = (*func)(princ_ent, data); 552 if(ret) { 553 krb5_clear_error_message(context); 554 krb5_warn(context, ret, "%s %s", funcname, princs[i]); 555 if (saved_ret == 0) 556 saved_ret = ret; 557 } 558 krb5_free_principal(context, princ_ent); 559 } 560 if (ret == 0 && saved_ret != 0) 561 ret = saved_ret; 562 kadm5_free_name_list(kadm_handle, princs, &num_princs); 563 return ret; 564 } 565 566 /* 567 * prompt with `prompt' and default value `def', and store the reply 568 * in `buf, len' 569 */ 570 571 #include <setjmp.h> 572 573 static jmp_buf jmpbuf; 574 575 static void 576 interrupt(int sig) 577 { 578 longjmp(jmpbuf, 1); 579 } 580 581 static int 582 get_response(const char *prompt, const char *def, char *buf, size_t len) 583 { 584 char *p; 585 void (*osig)(int); 586 587 osig = signal(SIGINT, interrupt); 588 if(setjmp(jmpbuf)) { 589 signal(SIGINT, osig); 590 fprintf(stderr, "\n"); 591 return 1; 592 } 593 594 fprintf(stderr, "%s [%s]:", prompt, def); 595 if(fgets(buf, len, stdin) == NULL) { 596 int save_errno = errno; 597 if(ferror(stdin)) 598 krb5_err(context, 1, save_errno, "<stdin>"); 599 signal(SIGINT, osig); 600 return 1; 601 } 602 p = strchr(buf, '\n'); 603 if(p) 604 *p = '\0'; 605 if(strcmp(buf, "") == 0) 606 strlcpy(buf, def, len); 607 signal(SIGINT, osig); 608 return 0; 609 } 610 611 /* 612 * return [0, 16) or -1 613 */ 614 615 static int 616 hex2n (char c) 617 { 618 static char hexdigits[] = "0123456789abcdef"; 619 const char *p; 620 621 p = strchr (hexdigits, tolower((unsigned char)c)); 622 if (p == NULL) 623 return -1; 624 else 625 return p - hexdigits; 626 } 627 628 /* 629 * convert a key in a readable format into a keyblock. 630 * return 0 iff succesful, otherwise `err' should point to an error message 631 */ 632 633 int 634 parse_des_key (const char *key_string, krb5_key_data *key_data, 635 const char **error) 636 { 637 const char *p = key_string; 638 unsigned char bits[8]; 639 int i; 640 641 if (strlen (key_string) != 16) { 642 *error = "bad length, should be 16 for DES key"; 643 return 1; 644 } 645 for (i = 0; i < 8; ++i) { 646 int d1, d2; 647 648 d1 = hex2n(p[2 * i]); 649 d2 = hex2n(p[2 * i + 1]); 650 if (d1 < 0 || d2 < 0) { 651 *error = "non-hex character"; 652 return 1; 653 } 654 bits[i] = (d1 << 4) | d2; 655 } 656 for (i = 0; i < 3; ++i) { 657 key_data[i].key_data_ver = 2; 658 key_data[i].key_data_kvno = 0; 659 /* key */ 660 key_data[i].key_data_type[0] = ETYPE_DES_CBC_CRC; 661 key_data[i].key_data_length[0] = 8; 662 key_data[i].key_data_contents[0] = malloc(8); 663 if (key_data[i].key_data_contents[0] == NULL) { 664 *error = "malloc"; 665 return ENOMEM; 666 } 667 memcpy (key_data[i].key_data_contents[0], bits, 8); 668 /* salt */ 669 key_data[i].key_data_type[1] = KRB5_PW_SALT; 670 key_data[i].key_data_length[1] = 0; 671 key_data[i].key_data_contents[1] = NULL; 672 } 673 key_data[0].key_data_type[0] = ETYPE_DES_CBC_MD5; 674 key_data[1].key_data_type[0] = ETYPE_DES_CBC_MD4; 675 return 0; 676 } 677