kadmin/util.c

   1 /*
   2  * Copyright (c) 1997, 1998, 1999 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 /*
  45  * attributes
  46  */
  47
  48 struct units kdb_attrs[] = {
  49     { "new-princ",              KRB5_KDB_NEW_PRINC },
  50     { "support-desmd5",         KRB5_KDB_SUPPORT_DESMD5 },
  51     { "pwchange-service",       KRB5_KDB_PWCHANGE_SERVICE },
  52     { "disallow-svr",           KRB5_KDB_DISALLOW_SVR },
  53     { "requires-pw-change",     KRB5_KDB_REQUIRES_PWCHANGE },
  54     { "requires-hw-auth",       KRB5_KDB_REQUIRES_HW_AUTH },
  55     { "requires-pre-auth",      KRB5_KDB_REQUIRES_PRE_AUTH },
  56     { "disallow-all-tix",       KRB5_KDB_DISALLOW_ALL_TIX },
  57     { "disallow-dup-skey",      KRB5_KDB_DISALLOW_DUP_SKEY },
  58     { "disallow-proxiable",     KRB5_KDB_DISALLOW_PROXIABLE },
  59     { "disallow-renewable",     KRB5_KDB_DISALLOW_RENEWABLE },
  60     { "disallow-tgt-based",     KRB5_KDB_DISALLOW_TGT_BASED },
  61     { "disallow-forwardable",   KRB5_KDB_DISALLOW_FORWARDABLE },
  62     { "disallow-postdated",     KRB5_KDB_DISALLOW_POSTDATED },
  63     { NULL }
  64 };
  65
  66 /*
  67  * convert the attributes in `attributes' into a printable string
  68  * in `str, len'
  69  */
  70
  71 void
  72 attributes2str(krb5_flags attributes, char *str, size_t len)
  73 {
  74     unparse_flags (attributes, kdb_attrs, str, len);
  75 }
  76
  77 /*
  78  * convert the string in `str' into attributes in `flags'
  79  * return 0 if parsed ok, else -1.
  80  */
  81
  82 int
  83 str2attributes(const char *str, krb5_flags *flags)
  84 {
  85     int res;
  86
  87     res = parse_flags (str, kdb_attrs, *flags);
  88     if (res < 0)
  89         return res;
  90     else {
  91         *flags = res;
  92         return 0;
  93     }
  94 }
  95
  96 /*
  97  * try to parse the string `resp' into attributes in `attr', also
  98  * setting the `bit' in `mask' if attributes are given and valid.
  99  */
 100
 101 int
 102 parse_attributes (const char *resp, krb5_flags *attr, int *mask, int bit)
 103 {
 104     krb5_flags tmp = *attr;
 105
 106     if (resp[0] == '\0')
 107         return 0;
 108     else if (str2attributes(resp, &tmp) == 0) {
 109         *attr = tmp;
 110         if (mask)
 111             *mask |= bit;
 112         return 0;
 113     } else if(*resp == '?') {
 114         print_flags_table (kdb_attrs, stderr);
 115     } else {
 116         fprintf (stderr, "Unable to parse '%s'\n", resp);
 117     }
 118     return -1;
 119 }
 120
 121 /*
 122  * allow the user to edit the attributes in `attr', prompting with `prompt'
 123  */
 124
 125 int
 126 edit_attributes (const char *prompt, krb5_flags *attr, int *mask, int bit)
 127 {
 128     char buf[1024], resp[1024];
 129
 130     if (mask && (*mask & bit))
 131         return 0;
 132
 133     attributes2str(*attr, buf, sizeof(buf));
 134     for (;;) {
 135         get_response("Attributes", buf, resp, sizeof(resp));
 136         if (parse_attributes (resp, attr, mask, bit) == 0)
 137             break;
 138     }
 139     return 0;
 140 }
 141
 142 /*
 143  * time_t
 144  * the special value 0 means ``never''
 145  */
 146
 147 /*
 148  * Convert the time `t' to a string representation in `str' (of max
 149  * size `len').  If include_time also include time, otherwise just
 150  * date.
 151  */
 152
 153 void
 154 time_t2str(time_t t, char *str, size_t len, int include_time)
 155 {
 156     if(t) {
 157         if(include_time)
 158             strftime(str, len, "%Y-%m-%d %H:%M:%S UTC", gmtime(&t));
 159         else
 160             strftime(str, len, "%Y-%m-%d", gmtime(&t));
 161     } else
 162         snprintf(str, len, "never");
 163 }
 164
 165 /*
 166  * Convert the time representation in `str' to a time in `time'.
 167  * Return 0 if succesful, else -1.
 168  */
 169
 170 int
 171 str2time_t (const char *str, time_t *time)
 172 {
 173     const char *p;
 174     struct tm tm;
 175
 176     memset (&tm, 0, sizeof (tm));
 177
 178     if(strcasecmp(str, "never") == 0) {
 179         *time = 0;
 180         return 0;
 181     }
 182
 183     p = strptime (str, "%Y-%m-%d", &tm);
 184
 185     if (p == NULL)
 186         return -1;
 187
 188     /* Do it on the end of the day */
 189     tm.tm_hour = 23;
 190     tm.tm_min  = 59;
 191     tm.tm_sec  = 59;
 192
 193     strptime (p, "%H:%M:%S", &tm);
 194
 195     *time = tm2time (tm, 0);
 196     return 0;
 197 }
 198
 199 /*
 200  * try to parse the time in `resp' storing it in `value'
 201  */
 202
 203 int
 204 parse_timet (const char *resp, krb5_timestamp *value, int *mask, int bit)
 205 {
 206     time_t tmp;
 207
 208     if (str2time_t(resp, &tmp) == 0) {
 209         *value = tmp;
 210         if(mask)
 211             *mask |= bit;
 212         return 0;
 213     } else if(*resp == '?') {
 214         printf ("Print date on format YYYY-mm-dd [hh:mm:ss]\n");
 215     } else {
 216         fprintf (stderr, "Unable to parse time '%s'\n", resp);
 217     }
 218     return -1;
 219 }
 220
 221 /*
 222  * allow the user to edit the time in `value'
 223  */
 224
 225 int
 226 edit_timet (const char *prompt, krb5_timestamp *value, int *mask, int bit)
 227 {
 228     char buf[1024], resp[1024];
 229
 230     if (mask && (*mask & bit))
 231         return 0;
 232
 233     time_t2str (*value, buf, sizeof (buf), 0);
 234
 235     for (;;) {
 236         get_response(prompt, buf, resp, sizeof(resp));
 237         if (parse_timet (resp, value, mask, bit) == 0)
 238             break;
 239     }
 240     return 0;
 241 }
 242
 243 /*
 244  * deltat
 245  * the special value 0 means ``unlimited''
 246  */
 247
 248 /*
 249  * convert the delta_t value in `t' into a printable form in `str, len'
 250  */
 251
 252 void
 253 deltat2str(unsigned t, char *str, size_t len)
 254 {
 255     if(t)
 256         unparse_time(t, str, len);
 257     else
 258         snprintf(str, len, "unlimited");
 259 }
 260
 261 /*
 262  * parse the delta value in `str', storing result in `*delta'
 263  * return 0 if ok, else -1
 264  */
 265
 266 int
 267 str2deltat(const char *str, krb5_deltat *delta)
 268 {
 269     int res;
 270
 271     if(strcasecmp(str, "unlimited") == 0) {
 272         *delta = 0;
 273         return 0;
 274     }
 275     res = parse_time(str, "day");
 276     if (res < 0)
 277         return res;
 278     else {
 279         *delta = res;
 280         return 0;
 281     }
 282 }
 283
 284 /*
 285  * try to parse the string in `resp' into a deltad in `value'
 286  * `mask' will get the bit `bit' set if a value was given.
 287  */
 288
 289 int
 290 parse_deltat (const char *resp, krb5_deltat *value, int *mask, int bit)
 291 {
 292     krb5_deltat tmp;
 293
 294     if (str2deltat(resp, &tmp) == 0) {
 295         *value = tmp;
 296         if (mask)
 297             *mask |= bit;
 298         return 0;
 299     } else if(*resp == '?') {
 300         print_time_table (stderr);
 301     } else {
 302         fprintf (stderr, "Unable to parse time '%s'\n", resp);
 303     }
 304     return -1;
 305 }
 306
 307 /*
 308  * allow the user to edit the deltat in `value'
 309  */
 310
 311 int
 312 edit_deltat (const char *prompt, krb5_deltat *value, int *mask, int bit)
 313 {
 314     char buf[1024], resp[1024];
 315
 316     if (mask && (*mask & bit))
 317         return 0;
 318
 319     deltat2str(*value, buf, sizeof(buf));
 320     for (;;) {
 321         get_response(prompt, buf, resp, sizeof(resp));
 322         if (parse_deltat (resp, value, mask, bit) == 0)
 323             break;
 324     }
 325     return 0;
 326 }
 327
 328 /*
 329  * allow the user to edit `ent'
 330  */
 331
 332 int
 333 edit_entry(kadm5_principal_ent_t ent, int *mask,
 334            kadm5_principal_ent_t default_ent, int default_mask)
 335 {
 336     if (default_ent && (default_mask & KADM5_MAX_LIFE))
 337         ent->max_life = default_ent->max_life;
 338     edit_deltat ("Max ticket life", &ent->max_life, mask,
 339                  KADM5_MAX_LIFE);
 340
 341     if (default_ent && (default_mask & KADM5_MAX_RLIFE))
 342         ent->max_renewable_life = default_ent->max_renewable_life;
 343     edit_deltat ("Max renewable life", &ent->max_renewable_life, mask,
 344                  KADM5_MAX_RLIFE);
 345
 346     if (default_ent && (default_mask & KADM5_PRINC_EXPIRE_TIME))
 347         ent->princ_expire_time = default_ent->princ_expire_time;
 348     edit_timet ("Principal expiration time", &ent->princ_expire_time, mask,
 349                KADM5_PRINC_EXPIRE_TIME);
 350
 351     if (default_ent && (default_mask & KADM5_PW_EXPIRATION))
 352         ent->pw_expiration = default_ent->pw_expiration;
 353     edit_timet ("Password expiration time", &ent->pw_expiration, mask,
 354                KADM5_PW_EXPIRATION);
 355
 356     if (default_ent && (default_mask & KADM5_ATTRIBUTES))
 357         ent->attributes = default_ent->attributes & ~KRB5_KDB_DISALLOW_ALL_TIX;
 358     edit_attributes ("Attributes", &ent->attributes, mask,
 359                      KADM5_ATTRIBUTES);
 360     return 0;
 361 }
 362
 363 /*
 364  * Parse the arguments, set the fields in `ent' and the `mask' for the
 365  * entries having been set.
 366  * Return 1 on failure and 0 on success.
 367  */
 368
 369 int
 370 set_entry(krb5_context context,
 371           kadm5_principal_ent_t ent,
 372           int *mask,
 373           const char *max_ticket_life,
 374           const char *max_renewable_life,
 375           const char *expiration,
 376           const char *pw_expiration,
 377           const char *attributes)
 378 {
 379     if (max_ticket_life != NULL) {
 380         if (parse_deltat (max_ticket_life, &ent->max_life,
 381                           mask, KADM5_MAX_LIFE)) {
 382             krb5_warnx (context, "unable to parse `%s'", max_ticket_life);
 383             return 1;
 384         }
 385     }
 386     if (max_renewable_life != NULL) {
 387         if (parse_deltat (max_renewable_life, &ent->max_renewable_life,
 388                           mask, KADM5_MAX_RLIFE)) {
 389             krb5_warnx (context, "unable to parse `%s'", max_renewable_life);
 390             return 1;
 391         }
 392     }
 393
 394     if (expiration) {
 395         if (parse_timet (expiration, &ent->princ_expire_time,
 396                         mask, KADM5_PRINC_EXPIRE_TIME)) {
 397             krb5_warnx (context, "unable to parse `%s'", expiration);
 398             return 1;
 399         }
 400     }
 401     if (pw_expiration) {
 402         if (parse_timet (pw_expiration, &ent->pw_expiration,
 403                          mask, KADM5_PW_EXPIRATION)) {
 404             krb5_warnx (context, "unable to parse `%s'", pw_expiration);
 405             return 1;
 406         }
 407     }
 408     if (attributes != NULL) {
 409         if (parse_attributes (attributes, &ent->attributes,
 410                               mask, KADM5_ATTRIBUTES)) {
 411             krb5_warnx (context, "unable to parse `%s'", attributes);
 412             return 1;
 413         }
 414     }
 415     return 0;
 416 }
 417
 418 /*
 419  * Does `string' contain any globing characters?
 420  */
 421
 422 static int
 423 is_expression(const char *string)
 424 {
 425     const char *p;
 426     int quote = 0;
 427
 428     for(p = string; *p; p++) {
 429         if(quote) {
 430             quote = 0;
 431             continue;
 432         }
 433         if(*p == '\\')
 434             quote++;
 435         else if(strchr("[]*?", *p) != NULL)
 436             return 1;
 437     }
 438     return 0;
 439 }
 440
 441 /* loop over all principals matching exp */
 442 int
 443 foreach_principal(const char *exp,
 444                   int (*func)(krb5_principal, void*),
 445                   void *data)
 446 {
 447     char **princs;
 448     int num_princs;
 449     int i;
 450     krb5_error_code ret;
 451     krb5_principal princ_ent;
 452     int is_expr;
 453
 454     /* if this isn't an expression, there is no point in wading
 455        through the whole database looking for matches */
 456     is_expr = is_expression(exp);
 457     if(is_expr)
 458         ret = kadm5_get_principals(kadm_handle, exp, &princs, &num_princs);
 459     if(!is_expr || ret == KADM5_AUTH_LIST) {
 460         /* we might be able to perform the requested opreration even
 461            if we're not allowed to list principals */
 462         num_princs = 1;
 463         princs = malloc(sizeof(*princs));
 464         if(princs == NULL)
 465             return ENOMEM;
 466         princs[0] = strdup(exp);
 467         if(princs[0] == NULL){
 468             free(princs);
 469             return ENOMEM;
 470         }
 471     } else if(ret) {
 472         krb5_warn(context, ret, "kadm5_get_principals");
 473         return ret;
 474     }
 475     for(i = 0; i < num_princs; i++) {
 476         ret = krb5_parse_name(context, princs[i], &princ_ent);
 477         if(ret){
 478             krb5_warn(context, ret, "krb5_parse_name(%s)", princs[i]);
 479             continue;
 480         }
 481         ret = (*func)(princ_ent, data);
 482         if(ret) {
 483             char *tmp;
 484             krb5_error_code ret2;
 485
 486             ret2 = krb5_unparse_name(context, princ_ent, &tmp);
 487             if(ret2) {
 488                 krb5_warn(context, ret2, "krb5_unparse_name");
 489                 krb5_warn(context, ret, "<unknown principal>");
 490             } else {
 491                 krb5_warn(context, ret, "%s", tmp);
 492                 free(tmp);
 493             }
 494         }
 495         krb5_free_principal(context, princ_ent);
 496     }
 497     kadm5_free_name_list(kadm_handle, princs, &num_princs);
 498     return 0;
 499 }
 500
 501 /*
 502  * prompt with `prompt' and default value `def', and store the reply
 503  * in `buf, len'
 504  */
 505
 506 void
 507 get_response(const char *prompt, const char *def, char *buf, size_t len)
 508 {
 509     char *p;
 510
 511     printf("%s [%s]:", prompt, def);
 512     if(fgets(buf, len, stdin) == NULL)
 513         *buf = '\0';
 514     p = strchr(buf, '\n');
 515     if(p)
 516         *p = '\0';
 517     if(strcmp(buf, "") == 0)
 518         strncpy(buf, def, len);
 519     buf[len-1] = 0;
 520 }