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 /*
  38  * util.c - functions for parsing, unparsing, and editing different
  39  * types of data used in kadmin.
  40  */
  41
  42 static int
  43 get_response(const char *prompt, const char *def, char *buf, size_t len);
  44
  45 /*
  46  * attributes
  47  */
  48
  49 struct units kdb_attrs[] = {
  50     { "allow-digest",           KRB5_KDB_ALLOW_DIGEST },
  51     { "allow-kerberos4",        KRB5_KDB_ALLOW_KERBEROS4 },
  52     { "trusted-for-delegation", KRB5_KDB_TRUSTED_FOR_DELEGATION },
  53     { "ok-as-delegate",         KRB5_KDB_OK_AS_DELEGATE },
  54     { "new-princ",              KRB5_KDB_NEW_PRINC },
  55     { "support-desmd5",         KRB5_KDB_SUPPORT_DESMD5 },
  56     { "pwchange-service",       KRB5_KDB_PWCHANGE_SERVICE },
  57     { "disallow-svr",           KRB5_KDB_DISALLOW_SVR },
  58     { "requires-pw-change",     KRB5_KDB_REQUIRES_PWCHANGE },
  59     { "requires-hw-auth",       KRB5_KDB_REQUIRES_HW_AUTH },
  60     { "requires-pre-auth",      KRB5_KDB_REQUIRES_PRE_AUTH },
  61     { "disallow-all-tix",       KRB5_KDB_DISALLOW_ALL_TIX },
  62     { "disallow-dup-skey",      KRB5_KDB_DISALLOW_DUP_SKEY },
  63     { "disallow-proxiable",     KRB5_KDB_DISALLOW_PROXIABLE },
  64     { "disallow-renewable",     KRB5_KDB_DISALLOW_RENEWABLE },
  65     { "disallow-tgt-based",     KRB5_KDB_DISALLOW_TGT_BASED },
  66     { "disallow-forwardable",   KRB5_KDB_DISALLOW_FORWARDABLE },
  67     { "disallow-postdated",     KRB5_KDB_DISALLOW_POSTDATED },
  68     { NULL, 0 }
  69 };
  70
  71 /*
  72  * convert the attributes in `attributes' into a printable string
  73  * in `str, len'
  74  */
  75
  76 void
  77 attributes2str(krb5_flags attributes, char *str, size_t len)
  78 {
  79     unparse_flags (attributes, kdb_attrs, str, len);
  80 }
  81
  82 /*
  83  * convert the string in `str' into attributes in `flags'
  84  * return 0 if parsed ok, else -1.
  85  */
  86
  87 int
  88 str2attributes(const char *str, krb5_flags *flags)
  89 {
  90     int res;
  91
  92     res = parse_flags (str, kdb_attrs, *flags);
  93     if (res < 0)
  94         return res;
  95     else {
  96         *flags = res;
  97         return 0;
  98     }
  99 }
 100
 101 /*
 102  * try to parse the string `resp' into attributes in `attr', also
 103  * setting the `bit' in `mask' if attributes are given and valid.
 104  */
 105
 106 int
 107 parse_attributes (const char *resp, krb5_flags *attr, int *mask, int bit)
 108 {
 109     krb5_flags tmp = *attr;
 110
 111     if (str2attributes(resp, &tmp) == 0) {
 112         *attr = tmp;
 113         if (mask)
 114             *mask |= bit;
 115         return 0;
 116     } else if(*resp == '?') {
 117         print_flags_table (kdb_attrs, stderr);
 118     } else {
 119         fprintf (stderr, "Unable to parse \"%s\"\n", resp);
 120     }
 121     return -1;
 122 }
 123
 124 /*
 125  * allow the user to edit the attributes in `attr', prompting with `prompt'
 126  */
 127
 128 int
 129 edit_attributes (const char *prompt, krb5_flags *attr, int *mask, int bit)
 130 {
 131     char buf[1024], resp[1024];
 132
 133     if (mask && (*mask & bit))
 134         return 0;
 135
 136     attributes2str(*attr, buf, sizeof(buf));
 137     for (;;) {
 138         if(get_response("Attributes", buf, resp, sizeof(resp)) != 0)
 139             return 1;
 140         if (resp[0] == '\0')
 141             break;
 142         if (parse_attributes (resp, attr, mask, bit) == 0)
 143             break;
 144     }
 145     return 0;
 146 }
 147
 148 /*
 149  * time_t
 150  * the special value 0 means ``never''
 151  */
 152
 153 /*
 154  * Convert the time `t' to a string representation in `str' (of max
 155  * size `len').  If include_time also include time, otherwise just
 156  * date.
 157  */
 158
 159 void
 160 time_t2str(time_t t, char *str, size_t len, int include_time)
 161 {
 162     if(t) {
 163         if(include_time)
 164             strftime(str, len, "%Y-%m-%d %H:%M:%S UTC", gmtime(&t));
 165         else
 166             strftime(str, len, "%Y-%m-%d", gmtime(&t));
 167     } else
 168         snprintf(str, len, "never");
 169 }
 170
 171 /*
 172  * Convert the time representation in `str' to a time in `time'.
 173  * Return 0 if succesful, else -1.
 174  */
 175
 176 int
 177 str2time_t (const char *str, time_t *t)
 178 {
 179     const char *p;
 180     struct tm tm, tm2;
 181
 182     memset (&tm, 0, sizeof (tm));
 183     memset (&tm2, 0, sizeof (tm2));
 184
 185     while(isspace((unsigned char)*str))
 186         str++;
 187
 188     if (str[0] == '+') {
 189         str++;
 190         *t = parse_time(str, "month");
 191         if (*t < 0)
 192             return -1;
 193         *t += time(NULL);
 194         return 0;
 195     }
 196
 197     if(strcasecmp(str, "never") == 0) {
 198         *t = 0;
 199         return 0;
 200     }
 201
 202     if(strcasecmp(str, "now") == 0) {
 203         *t = time(NULL);
 204         return 0;
 205     }
 206
 207     p = strptime (str, "%Y-%m-%d", &tm);
 208
 209     if (p == NULL)
 210         return -1;
 211
 212     while(isspace((unsigned char)*p))
 213         p++;
 214
 215     /* XXX this is really a bit optimistic, we should really complain
 216        if there was a problem parsing the time */
 217     if(p[0] != '\0' && strptime (p, "%H:%M:%S", &tm2) != NULL) {
 218         tm.tm_hour = tm2.tm_hour;
 219         tm.tm_min  = tm2.tm_min;
 220         tm.tm_sec  = tm2.tm_sec;
 221     } else {
 222         /* Do it on the end of the day */
 223         tm.tm_hour = 23;
 224         tm.tm_min  = 59;
 225         tm.tm_sec  = 59;
 226     }
 227
 228     *t = tm2time (tm, 0);
 229     return 0;
 230 }
 231
 232 /*
 233  * try to parse the time in `resp' storing it in `value'
 234  */
 235
 236 int
 237 parse_timet (const char *resp, krb5_timestamp *value, int *mask, int bit)
 238 {
 239     time_t tmp;
 240
 241     if (str2time_t(resp, &tmp) == 0) {
 242         *value = tmp;
 243         if(mask)
 244             *mask |= bit;
 245         return 0;
 246     }
 247     if(*resp != '?')
 248         fprintf (stderr, "Unable to parse time \"%s\"\n", resp);
 249     fprintf (stderr, "Print date on format YYYY-mm-dd [hh:mm:ss]\n");
 250     return -1;
 251 }
 252
 253 /*
 254  * allow the user to edit the time in `value'
 255  */
 256
 257 int
 258 edit_timet (const char *prompt, krb5_timestamp *value, int *mask, int bit)
 259 {
 260     char buf[1024], resp[1024];
 261
 262     if (mask && (*mask & bit))
 263         return 0;
 264
 265     time_t2str (*value, buf, sizeof (buf), 0);
 266
 267     for (;;) {
 268         if(get_response(prompt, buf, resp, sizeof(resp)) != 0)
 269             return 1;
 270         if (parse_timet (resp, value, mask, bit) == 0)
 271             break;
 272     }
 273     return 0;
 274 }
 275
 276 /*
 277  * deltat
 278  * the special value 0 means ``unlimited''
 279  */
 280
 281 /*
 282  * convert the delta_t value in `t' into a printable form in `str, len'
 283  */
 284
 285 void
 286 deltat2str(unsigned t, char *str, size_t len)
 287 {
 288     if(t == 0 || t == INT_MAX)
 289         snprintf(str, len, "unlimited");
 290     else
 291         unparse_time(t, str, len);
 292 }
 293
 294 /*
 295  * parse the delta value in `str', storing result in `*delta'
 296  * return 0 if ok, else -1
 297  */
 298
 299 int
 300 str2deltat(const char *str, krb5_deltat *delta)
 301 {
 302     int res;
 303
 304     if(strcasecmp(str, "unlimited") == 0) {
 305         *delta = 0;
 306         return 0;
 307     }
 308     res = parse_time(str, "day");
 309     if (res < 0)
 310         return res;
 311     else {
 312         *delta = res;
 313         return 0;
 314     }
 315 }
 316
 317 /*
 318  * try to parse the string in `resp' into a deltad in `value'
 319  * `mask' will get the bit `bit' set if a value was given.
 320  */
 321
 322 int
 323 parse_deltat (const char *resp, krb5_deltat *value, int *mask, int bit)
 324 {
 325     krb5_deltat tmp;
 326
 327     if (str2deltat(resp, &tmp) == 0) {
 328         *value = tmp;
 329         if (mask)
 330             *mask |= bit;
 331         return 0;
 332     } else if(*resp == '?') {
 333         print_time_table (stderr);
 334     } else {
 335         fprintf (stderr, "Unable to parse time \"%s\"\n", resp);
 336     }
 337     return -1;
 338 }
 339
 340 /*
 341  * allow the user to edit the deltat in `value'
 342  */
 343
 344 int
 345 edit_deltat (const char *prompt, krb5_deltat *value, int *mask, int bit)
 346 {
 347     char buf[1024], resp[1024];
 348
 349     if (mask && (*mask & bit))
 350         return 0;
 351
 352     deltat2str(*value, buf, sizeof(buf));
 353     for (;;) {
 354         if(get_response(prompt, buf, resp, sizeof(resp)) != 0)
 355             return 1;
 356         if (parse_deltat (resp, value, mask, bit) == 0)
 357             break;
 358     }
 359     return 0;
 360 }
 361
 362 /*
 363  * allow the user to edit `ent'
 364  */
 365
 366 void
 367 set_defaults(kadm5_principal_ent_t ent, int *mask,
 368              kadm5_principal_ent_t default_ent, int default_mask)
 369 {
 370     if (default_ent
 371         && (default_mask & KADM5_MAX_LIFE)
 372         && !(*mask & KADM5_MAX_LIFE))
 373         ent->max_life = default_ent->max_life;
 374
 375     if (default_ent
 376         && (default_mask & KADM5_MAX_RLIFE)
 377         && !(*mask & KADM5_MAX_RLIFE))
 378         ent->max_renewable_life = default_ent->max_renewable_life;
 379
 380     if (default_ent
 381         && (default_mask & KADM5_PRINC_EXPIRE_TIME)
 382         && !(*mask & KADM5_PRINC_EXPIRE_TIME))
 383         ent->princ_expire_time = default_ent->princ_expire_time;
 384
 385     if (default_ent
 386         && (default_mask & KADM5_PW_EXPIRATION)
 387         && !(*mask & KADM5_PW_EXPIRATION))
 388         ent->pw_expiration = default_ent->pw_expiration;
 389
 390     if (default_ent
 391         && (default_mask & KADM5_ATTRIBUTES)
 392         && !(*mask & KADM5_ATTRIBUTES))
 393         ent->attributes = default_ent->attributes & ~KRB5_KDB_DISALLOW_ALL_TIX;
 394 }
 395
 396 int
 397 edit_entry(kadm5_principal_ent_t ent, int *mask,
 398            kadm5_principal_ent_t default_ent, int default_mask)
 399 {
 400
 401     set_defaults(ent, mask, default_ent, default_mask);
 402
 403     if(edit_deltat ("Max ticket life", &ent->max_life, mask,
 404                     KADM5_MAX_LIFE) != 0)
 405         return 1;
 406
 407     if(edit_deltat ("Max renewable life", &ent->max_renewable_life, mask,
 408                     KADM5_MAX_RLIFE) != 0)
 409         return 1;
 410
 411     if(edit_timet ("Principal expiration time", &ent->princ_expire_time, mask,
 412                    KADM5_PRINC_EXPIRE_TIME) != 0)
 413         return 1;
 414
 415     if(edit_timet ("Password expiration time", &ent->pw_expiration, mask,
 416                    KADM5_PW_EXPIRATION) != 0)
 417         return 1;
 418
 419     if(edit_attributes ("Attributes", &ent->attributes, mask,
 420                         KADM5_ATTRIBUTES) != 0)
 421         return 1;
 422
 423     return 0;
 424 }
 425
 426 /*
 427  * Parse the arguments, set the fields in `ent' and the `mask' for the
 428  * entries having been set.
 429  * Return 1 on failure and 0 on success.
 430  */
 431
 432 int
 433 set_entry(krb5_context contextp,
 434           kadm5_principal_ent_t ent,
 435           int *mask,
 436           const char *max_ticket_life,
 437           const char *max_renewable_life,
 438           const char *expiration,
 439           const char *pw_expiration,
 440           const char *attributes)
 441 {
 442     if (max_ticket_life != NULL) {
 443         if (parse_deltat (max_ticket_life, &ent->max_life,
 444                           mask, KADM5_MAX_LIFE)) {
 445             krb5_warnx (contextp, "unable to parse `%s'", max_ticket_life);
 446             return 1;
 447         }
 448     }
 449     if (max_renewable_life != NULL) {
 450         if (parse_deltat (max_renewable_life, &ent->max_renewable_life,
 451                           mask, KADM5_MAX_RLIFE)) {
 452             krb5_warnx (contextp, "unable to parse `%s'", max_renewable_life);
 453             return 1;
 454         }
 455     }
 456
 457     if (expiration) {
 458         if (parse_timet (expiration, &ent->princ_expire_time,
 459                         mask, KADM5_PRINC_EXPIRE_TIME)) {
 460             krb5_warnx (contextp, "unable to parse `%s'", expiration);
 461             return 1;
 462         }
 463     }
 464     if (pw_expiration) {
 465         if (parse_timet (pw_expiration, &ent->pw_expiration,
 466                          mask, KADM5_PW_EXPIRATION)) {
 467             krb5_warnx (contextp, "unable to parse `%s'", pw_expiration);
 468             return 1;
 469         }
 470     }
 471     if (attributes != NULL) {
 472         if (parse_attributes (attributes, &ent->attributes,
 473                               mask, KADM5_ATTRIBUTES)) {
 474             krb5_warnx (contextp, "unable to parse `%s'", attributes);
 475             return 1;
 476         }
 477     }
 478     return 0;
 479 }
 480
 481 /*
 482  * Does `string' contain any globing characters?
 483  */
 484
 485 static int
 486 is_expression(const char *string)
 487 {
 488     const char *p;
 489     int quote = 0;
 490
 491     for(p = string; *p; p++) {
 492         if(quote) {
 493             quote = 0;
 494             continue;
 495         }
 496         if(*p == '\\')
 497             quote++;
 498         else if(strchr("[]*?", *p) != NULL)
 499             return 1;
 500     }
 501     return 0;
 502 }
 503
 504 /*
 505  * Loop over all principals matching exp.  If any of calls to `func'
 506  * failes, the first error is returned when all principals are
 507  * processed.
 508  */
 509 int
 510 foreach_principal(const char *exp_str,
 511                   int (*func)(krb5_principal, void*),
 512                   const char *funcname,
 513                   void *data)
 514 {
 515     char **princs = NULL;
 516     int num_princs = 0;
 517     int i;
 518     krb5_error_code saved_ret = 0, ret = 0;
 519     krb5_principal princ_ent;
 520     int is_expr;
 521
 522     /* if this isn't an expression, there is no point in wading
 523        through the whole database looking for matches */
 524     is_expr = is_expression(exp_str);
 525     if(is_expr)
 526         ret = kadm5_get_principals(kadm_handle, exp_str, &princs, &num_princs);
 527     if(!is_expr || ret == KADM5_AUTH_LIST) {
 528         /* we might be able to perform the requested opreration even
 529            if we're not allowed to list principals */
 530         num_princs = 1;
 531         princs = malloc(sizeof(*princs));
 532         if(princs == NULL)
 533             return ENOMEM;
 534         princs[0] = strdup(exp_str);
 535         if(princs[0] == NULL){
 536             free(princs);
 537             return ENOMEM;
 538         }
 539     } else if(ret) {
 540         krb5_warn(context, ret, "kadm5_get_principals");
 541         return ret;
 542     }
 543     for(i = 0; i < num_princs; i++) {
 544         ret = krb5_parse_name(context, princs[i], &princ_ent);
 545         if(ret){
 546             krb5_warn(context, ret, "krb5_parse_name(%s)", princs[i]);
 547             continue;
 548         }
 549         ret = (*func)(princ_ent, data);
 550         if(ret) {
 551             krb5_clear_error_message(context);
 552             krb5_warn(context, ret, "%s %s", funcname, princs[i]);
 553             if (saved_ret == 0)
 554                 saved_ret = ret;
 555         }
 556         krb5_free_principal(context, princ_ent);
 557     }
 558     if (ret == 0 && saved_ret != 0)
 559         ret = saved_ret;
 560     kadm5_free_name_list(kadm_handle, princs, &num_princs);
 561     return ret;
 562 }
 563
 564 /*
 565  * prompt with `prompt' and default value `def', and store the reply
 566  * in `buf, len'
 567  */
 568
 569 #include <setjmp.h>
 570
 571 static jmp_buf jmpbuf;
 572
 573 static void
 574 interrupt(int sig)
 575 {
 576     longjmp(jmpbuf, 1);
 577 }
 578
 579 static int
 580 get_response(const char *prompt, const char *def, char *buf, size_t len)
 581 {
 582     char *p;
 583     void (*osig)(int);
 584
 585     osig = signal(SIGINT, interrupt);
 586     if(setjmp(jmpbuf)) {
 587         signal(SIGINT, osig);
 588         fprintf(stderr, "\n");
 589         return 1;
 590     }
 591
 592     fprintf(stderr, "%s [%s]:", prompt, def);
 593     if(fgets(buf, len, stdin) == NULL) {
 594         int save_errno = errno;
 595         if(ferror(stdin))
 596             krb5_err(context, 1, save_errno, "<stdin>");
 597         signal(SIGINT, osig);
 598         return 1;
 599     }
 600     p = strchr(buf, '\n');
 601     if(p)
 602         *p = '\0';
 603     if(strcmp(buf, "") == 0)
 604         strlcpy(buf, def, len);
 605     signal(SIGINT, osig);
 606     return 0;
 607 }
 608
 609 /*
 610  * return [0, 16) or -1
 611  */
 612
 613 static int
 614 hex2n (char c)
 615 {
 616     static char hexdigits[] = "0123456789abcdef";
 617     const char *p;
 618
 619     p = strchr (hexdigits, tolower((unsigned char)c));
 620     if (p == NULL)
 621         return -1;
 622     else
 623         return p - hexdigits;
 624 }
 625
 626 /*
 627  * convert a key in a readable format into a keyblock.
 628  * return 0 iff succesful, otherwise `err' should point to an error message
 629  */
 630
 631 int
 632 parse_des_key (const char *key_string, krb5_key_data *key_data,
 633                const char **error)
 634 {
 635     const char *p = key_string;
 636     unsigned char bits[8];
 637     int i;
 638
 639     if (strlen (key_string) != 16) {
 640         *error = "bad length, should be 16 for DES key";
 641         return 1;
 642     }
 643     for (i = 0; i < 8; ++i) {
 644         int d1, d2;
 645
 646         d1 = hex2n(p[2 * i]);
 647         d2 = hex2n(p[2 * i + 1]);
 648         if (d1 < 0 || d2 < 0) {
 649             *error = "non-hex character";
 650             return 1;
 651         }
 652         bits[i] = (d1 << 4) | d2;
 653     }
 654     for (i = 0; i < 3; ++i) {
 655         key_data[i].key_data_ver  = 2;
 656         key_data[i].key_data_kvno = 0;
 657         /* key */
 658         key_data[i].key_data_type[0]     = ETYPE_DES_CBC_CRC;
 659         key_data[i].key_data_length[0]   = 8;
 660         key_data[i].key_data_contents[0] = malloc(8);
 661         if (key_data[i].key_data_contents[0] == NULL) {
 662             *error = "malloc";
 663             return ENOMEM;
 664         }
 665         memcpy (key_data[i].key_data_contents[0], bits, 8);
 666         /* salt */
 667         key_data[i].key_data_type[1]     = KRB5_PW_SALT;
 668         key_data[i].key_data_length[1]   = 0;
 669         key_data[i].key_data_contents[1] = NULL;
 670     }
 671     key_data[0].key_data_type[0] = ETYPE_DES_CBC_MD5;
 672     key_data[1].key_data_type[0] = ETYPE_DES_CBC_MD4;
 673     return 0;
 674 }