kadmin/util.c

   1 /*
   2  * Copyright (c) 1997 - 2006 Kungliga Tekniska Högskolan
   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("$Id$");
  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     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 context,
 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 (context, "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 (context, "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 (context, "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 (context, "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 (context, "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;
 518     int num_princs;
 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 }