src/external/heimdal/krb5/config_file.c

   1 /*
   2  * Copyright (c) 1997 - 2004 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Portions Copyright (c) 2009 Apple Inc. 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 "krb5_locl.h"
  37
  38 #ifdef __APPLE__
  39 #include <CoreFoundation/CoreFoundation.h>
  40 #endif
  41
  42 /* Gaah! I want a portable funopen */
  43 struct fileptr {
  44     const char *s;
  45     FILE *f;
  46 };
  47
  48 static char *
  49 config_fgets(char *str, size_t len, struct fileptr *ptr)
  50 {
  51     /* XXX this is not correct, in that they don't do the same if the
  52        line is longer than len */
  53     if(ptr->f != NULL)
  54         return fgets(str, len, ptr->f);
  55     else {
  56         /* this is almost strsep_copy */
  57         const char *p;
  58         ssize_t l;
  59         if(*ptr->s == '\0')
  60             return NULL;
  61         p = ptr->s + strcspn(ptr->s, "\n");
  62         if(*p == '\n')
  63             p++;
  64         l = min(len, (size_t)(p - ptr->s));
  65         if(len > 0) {
  66             memcpy(str, ptr->s, l);
  67             str[l] = '\0';
  68         }
  69         ptr->s = p;
  70         return str;
  71     }
  72 }
  73
  74 static krb5_error_code parse_section(char *p, krb5_config_section **s,
  75                                      krb5_config_section **res,
  76                                      const char **err_message);
  77 static krb5_error_code parse_binding(struct fileptr *f, unsigned *lineno, char *p,
  78                                      krb5_config_binding **b,
  79                                      krb5_config_binding **parent,
  80                                      const char **err_message);
  81 static krb5_error_code parse_list(struct fileptr *f, unsigned *lineno,
  82                                   krb5_config_binding **parent,
  83                                   const char **err_message);
  84
  85 KRB5_LIB_FUNCTION krb5_config_section * KRB5_LIB_CALL
  86 _krb5_config_get_entry(krb5_config_section **parent, const char *name, int type)
  87 {
  88     krb5_config_section **q;
  89
  90     for(q = parent; *q != NULL; q = &(*q)->next)
  91         if(type == krb5_config_list &&
  92            (unsigned)type == (*q)->type &&
  93            strcmp(name, (*q)->name) == 0)
  94             return *q;
  95     *q = calloc(1, sizeof(**q));
  96     if(*q == NULL)
  97         return NULL;
  98     (*q)->name = strdup(name);
  99     (*q)->type = type;
 100     if((*q)->name == NULL) {
 101         free(*q);
 102         *q = NULL;
 103         return NULL;
 104     }
 105     return *q;
 106 }
 107
 108 /*
 109  * Parse a section:
 110  *
 111  * [section]
 112  *      foo = bar
 113  *      b = {
 114  *              a
 115  *          }
 116  * ...
 117  *
 118  * starting at the line in `p', storing the resulting structure in
 119  * `s' and hooking it into `parent'.
 120  * Store the error message in `err_message'.
 121  */
 122
 123 static krb5_error_code
 124 parse_section(char *p, krb5_config_section **s, krb5_config_section **parent,
 125               const char **err_message)
 126 {
 127     char *p1;
 128     krb5_config_section *tmp;
 129
 130     p1 = strchr (p + 1, ']');
 131     if (p1 == NULL) {
 132         *err_message = "missing ]";
 133         return KRB5_CONFIG_BADFORMAT;
 134     }
 135     *p1 = '\0';
 136     tmp = _krb5_config_get_entry(parent, p + 1, krb5_config_list);
 137     if(tmp == NULL) {
 138         *err_message = "out of memory";
 139         return KRB5_CONFIG_BADFORMAT;
 140     }
 141     *s = tmp;
 142     return 0;
 143 }
 144
 145 /*
 146  * Parse a brace-enclosed list from `f', hooking in the structure at
 147  * `parent'.
 148  * Store the error message in `err_message'.
 149  */
 150
 151 static krb5_error_code
 152 parse_list(struct fileptr *f, unsigned *lineno, krb5_config_binding **parent,
 153            const char **err_message)
 154 {
 155     char buf[KRB5_BUFSIZ];
 156     krb5_error_code ret;
 157     krb5_config_binding *b = NULL;
 158     unsigned beg_lineno = *lineno;
 159
 160     while(config_fgets(buf, sizeof(buf), f) != NULL) {
 161         char *p;
 162
 163         ++*lineno;
 164         buf[strcspn(buf, "\r\n")] = '\0';
 165         p = buf;
 166         while(isspace((unsigned char)*p))
 167             ++p;
 168         if (*p == '#' || *p == ';' || *p == '\0')
 169             continue;
 170         while(isspace((unsigned char)*p))
 171             ++p;
 172         if (*p == '}')
 173             return 0;
 174         if (*p == '\0')
 175             continue;
 176         ret = parse_binding (f, lineno, p, &b, parent, err_message);
 177         if (ret)
 178             return ret;
 179     }
 180     *lineno = beg_lineno;
 181     *err_message = "unclosed {";
 182     return KRB5_CONFIG_BADFORMAT;
 183 }
 184
 185 /*
 186  *
 187  */
 188
 189 static krb5_error_code
 190 parse_binding(struct fileptr *f, unsigned *lineno, char *p,
 191               krb5_config_binding **b, krb5_config_binding **parent,
 192               const char **err_message)
 193 {
 194     krb5_config_binding *tmp;
 195     char *p1, *p2;
 196     krb5_error_code ret = 0;
 197
 198     p1 = p;
 199     while (*p && *p != '=' && !isspace((unsigned char)*p))
 200         ++p;
 201     if (*p == '\0') {
 202         *err_message = "missing =";
 203         return KRB5_CONFIG_BADFORMAT;
 204     }
 205     p2 = p;
 206     while (isspace((unsigned char)*p))
 207         ++p;
 208     if (*p != '=') {
 209         *err_message = "missing =";
 210         return KRB5_CONFIG_BADFORMAT;
 211     }
 212     ++p;
 213     while(isspace((unsigned char)*p))
 214         ++p;
 215     *p2 = '\0';
 216     if (*p == '{') {
 217         tmp = _krb5_config_get_entry(parent, p1, krb5_config_list);
 218         if (tmp == NULL) {
 219             *err_message = "out of memory";
 220             return KRB5_CONFIG_BADFORMAT;
 221         }
 222         ret = parse_list (f, lineno, &tmp->u.list, err_message);
 223     } else {
 224         tmp = _krb5_config_get_entry(parent, p1, krb5_config_string);
 225         if (tmp == NULL) {
 226             *err_message = "out of memory";
 227             return KRB5_CONFIG_BADFORMAT;
 228         }
 229         p1 = p;
 230         p = p1 + strlen(p1);
 231         while(p > p1 && isspace((unsigned char)*(p-1)))
 232             --p;
 233         *p = '\0';
 234         tmp->u.string = strdup(p1);
 235     }
 236     *b = tmp;
 237     return ret;
 238 }
 239
 240 #if defined(__APPLE__)
 241
 242 #if MAC_OS_X_VERSION_MIN_REQUIRED >= 1060
 243 #define HAVE_CFPROPERTYLISTCREATEWITHSTREAM 1
 244 #endif
 245
 246 static char *
 247 cfstring2cstring(CFStringRef string)
 248 {
 249     CFIndex len;
 250     char *str;
 251
 252     str = (char *) CFStringGetCStringPtr(string, kCFStringEncodingUTF8);
 253     if (str)
 254         return strdup(str);
 255
 256     len = CFStringGetLength(string);
 257     len = 1 + CFStringGetMaximumSizeForEncoding(len, kCFStringEncodingUTF8);
 258     str = malloc(len);
 259     if (str == NULL)
 260         return NULL;
 261
 262     if (!CFStringGetCString (string, str, len, kCFStringEncodingUTF8)) {
 263         free (str);
 264         return NULL;
 265     }
 266     return str;
 267 }
 268
 269 static void
 270 convert_content(const void *key, const void *value, void *context)
 271 {
 272     krb5_config_section *tmp, **parent = context;
 273     char *k;
 274
 275     if (CFGetTypeID(key) != CFStringGetTypeID())
 276         return;
 277
 278     k = cfstring2cstring(key);
 279     if (k == NULL)
 280         return;
 281
 282     if (CFGetTypeID(value) == CFStringGetTypeID()) {
 283         tmp = _krb5_config_get_entry(parent, k, krb5_config_string);
 284         tmp->u.string = cfstring2cstring(value);
 285     } else if (CFGetTypeID(value) == CFDictionaryGetTypeID()) {
 286         tmp = _krb5_config_get_entry(parent, k, krb5_config_list);
 287         CFDictionaryApplyFunction(value, convert_content, &tmp->u.list);
 288     } else {
 289         /* log */
 290     }
 291     free(k);
 292 }
 293
 294 static krb5_error_code
 295 parse_plist_config(krb5_context context, const char *path, krb5_config_section **parent)
 296 {
 297     CFReadStreamRef s;
 298     CFDictionaryRef d;
 299     CFURLRef url;
 300
 301     url = CFURLCreateFromFileSystemRepresentation(kCFAllocatorDefault, (UInt8 *)path, strlen(path), FALSE);
 302     if (url == NULL) {
 303         krb5_clear_error_message(context);
 304         return ENOMEM;
 305     }
 306
 307     s = CFReadStreamCreateWithFile(kCFAllocatorDefault, url);
 308     CFRelease(url);
 309     if (s == NULL) {
 310         krb5_clear_error_message(context);
 311         return ENOMEM;
 312     }
 313
 314     if (!CFReadStreamOpen(s)) {
 315         CFRelease(s);
 316         krb5_clear_error_message(context);
 317         return ENOENT;
 318     }
 319
 320 #ifdef HAVE_CFPROPERTYLISTCREATEWITHSTREAM
 321     d = (CFDictionaryRef)CFPropertyListCreateWithStream(NULL, s, 0, kCFPropertyListImmutable, NULL, NULL);
 322 #else
 323     d = (CFDictionaryRef)CFPropertyListCreateFromStream(NULL, s, 0, kCFPropertyListImmutable, NULL, NULL);
 324 #endif
 325     CFRelease(s);
 326     if (d == NULL) {
 327         krb5_clear_error_message(context);
 328         return ENOENT;
 329     }
 330
 331     CFDictionaryApplyFunction(d, convert_content, parent);
 332     CFRelease(d);
 333
 334     return 0;
 335 }
 336
 337 #endif
 338
 339
 340 /*
 341  * Parse the config file `fname', generating the structures into `res'
 342  * returning error messages in `err_message'
 343  */
 344
 345 static krb5_error_code
 346 krb5_config_parse_debug (struct fileptr *f,
 347                          krb5_config_section **res,
 348                          unsigned *lineno,
 349                          const char **err_message)
 350 {
 351     krb5_config_section *s = NULL;
 352     krb5_config_binding *b = NULL;
 353     char buf[KRB5_BUFSIZ];
 354     krb5_error_code ret;
 355
 356     while (config_fgets(buf, sizeof(buf), f) != NULL) {
 357         char *p;
 358
 359         ++*lineno;
 360         buf[strcspn(buf, "\r\n")] = '\0';
 361         p = buf;
 362         while(isspace((unsigned char)*p))
 363             ++p;
 364         if (*p == '#' || *p == ';')
 365             continue;
 366         if (*p == '[') {
 367             ret = parse_section(p, &s, res, err_message);
 368             if (ret)
 369                 return ret;
 370             b = NULL;
 371         } else if (*p == '}') {
 372             *err_message = "unmatched }";
 373             return EINVAL;      /* XXX */
 374         } else if(*p != '\0') {
 375             if (s == NULL) {
 376                 *err_message = "binding before section";
 377                 return EINVAL;
 378             }
 379             ret = parse_binding(f, lineno, p, &b, &s->u.list, err_message);
 380             if (ret)
 381                 return ret;
 382         }
 383     }
 384     return 0;
 385 }
 386
 387 static int
 388 is_plist_file(const char *fname)
 389 {
 390     size_t len = strlen(fname);
 391     char suffix[] = ".plist";
 392     if (len < sizeof(suffix))
 393         return 0;
 394     if (strcasecmp(&fname[len - (sizeof(suffix) - 1)], suffix) != 0)
 395         return 0;
 396     return 1;
 397 }
 398
 399 /**
 400  * Parse a configuration file and add the result into res. This
 401  * interface can be used to parse several configuration files into one
 402  * resulting krb5_config_section by calling it repeatably.
 403  *
 404  * @param context a Kerberos 5 context.
 405  * @param fname a file name to a Kerberos configuration file
 406  * @param res the returned result, must be free with krb5_free_config_files().
 407  * @return Return an error code or 0, see krb5_get_error_message().
 408  *
 409  * @ingroup krb5_support
 410  */
 411
 412 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
 413 krb5_config_parse_file_multi (krb5_context context,
 414                               const char *fname,
 415                               krb5_config_section **res)
 416 {
 417     const char *str;
 418     char *newfname = NULL;
 419     unsigned lineno = 0;
 420     krb5_error_code ret;
 421     struct fileptr f;
 422
 423     /**
 424      * If the fname starts with "~/" parse configuration file in the
 425      * current users home directory. The behavior can be disabled and
 426      * enabled by calling krb5_set_home_dir_access().
 427      */
 428     if (fname[0] == '~' && fname[1] == '/') {
 429 #ifndef KRB5_USE_PATH_TOKENS
 430         const char *home = NULL;
 431
 432         if (!_krb5_homedir_access(context)) {
 433             krb5_set_error_message(context, EPERM,
 434                                    "Access to home directory not allowed");
 435             return EPERM;
 436         }
 437
 438         if(!issuid())
 439             home = getenv("HOME");
 440
 441         if (home == NULL) {
 442             struct passwd *pw = getpwuid(getuid());
 443             if(pw != NULL)
 444                 home = pw->pw_dir;
 445         }
 446         if (home) {
 447             int aret;
 448
 449             aret = asprintf(&newfname, "%s%s", home, &fname[1]);
 450             if (aret == -1 || newfname == NULL)
 451                 return krb5_enomem(context);
 452             fname = newfname;
 453         }
 454 #else  /* KRB5_USE_PATH_TOKENS */
 455         if (asprintf(&newfname, "%%{USERCONFIG}%s", &fname[1]) < 0 ||
 456             newfname == NULL)
 457             return krb5_enomem(context);
 458         fname = newfname;
 459 #endif
 460     }
 461
 462     if (is_plist_file(fname)) {
 463 #ifdef __APPLE__
 464         ret = parse_plist_config(context, fname, res);
 465         if (ret) {
 466             krb5_set_error_message(context, ret,
 467                                    "Failed to parse plist %s", fname);
 468             if (newfname)
 469                 free(newfname);
 470             return ret;
 471         }
 472 #else
 473         krb5_set_error_message(context, ENOENT,
 474                                "no support for plist configuration files");
 475         return ENOENT;
 476 #endif
 477     } else {
 478 #ifdef KRB5_USE_PATH_TOKENS
 479         char * exp_fname = NULL;
 480
 481         ret = _krb5_expand_path_tokens(context, fname, &exp_fname);
 482         if (ret) {
 483             if (newfname)
 484                 free(newfname);
 485             return ret;
 486         }
 487
 488         if (newfname)
 489             free(newfname);
 490         fname = newfname = exp_fname;
 491 #endif
 492
 493         f.f = fopen(fname, "r");
 494         f.s = NULL;
 495         if(f.f == NULL) {
 496             ret = errno;
 497             krb5_set_error_message (context, ret, "open %s: %s",
 498                                     fname, strerror(ret));
 499             if (newfname)
 500                 free(newfname);
 501             return ret;
 502         }
 503
 504         ret = krb5_config_parse_debug (&f, res, &lineno, &str);
 505         fclose(f.f);
 506         if (ret) {
 507             krb5_set_error_message (context, ret, "%s:%u: %s",
 508                                     fname, lineno, str);
 509             if (newfname)
 510                 free(newfname);
 511             return ret;
 512         }
 513     }
 514     return 0;
 515 }
 516
 517 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
 518 krb5_config_parse_file (krb5_context context,
 519                         const char *fname,
 520                         krb5_config_section **res)
 521 {
 522     *res = NULL;
 523     return krb5_config_parse_file_multi(context, fname, res);
 524 }
 525
 526 static void
 527 free_binding (krb5_context context, krb5_config_binding *b)
 528 {
 529     krb5_config_binding *next_b;
 530
 531     while (b) {
 532         free (b->name);
 533         if (b->type == krb5_config_string)
 534             free (b->u.string);
 535         else if (b->type == krb5_config_list)
 536             free_binding (context, b->u.list);
 537         else
 538             krb5_abortx(context, "unknown binding type (%d) in free_binding",
 539                         b->type);
 540         next_b = b->next;
 541         free (b);
 542         b = next_b;
 543     }
 544 }
 545
 546 /**
 547  * Free configuration file section, the result of
 548  * krb5_config_parse_file() and krb5_config_parse_file_multi().
 549  *
 550  * @param context A Kerberos 5 context
 551  * @param s the configuration section to free
 552  *
 553  * @return returns 0 on successes, otherwise an error code, see
 554  *          krb5_get_error_message()
 555  *
 556  * @ingroup krb5_support
 557  */
 558
 559 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
 560 krb5_config_file_free (krb5_context context, krb5_config_section *s)
 561 {
 562     free_binding (context, s);
 563     return 0;
 564 }
 565
 566 #ifndef HEIMDAL_SMALLER
 567
 568 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
 569 _krb5_config_copy(krb5_context context,
 570                   krb5_config_section *c,
 571                   krb5_config_section **head)
 572 {
 573     krb5_config_binding *d, *previous = NULL;
 574
 575     *head = NULL;
 576
 577     while (c) {
 578         d = calloc(1, sizeof(*d));
 579
 580         if (*head == NULL)
 581             *head = d;
 582
 583         d->name = strdup(c->name);
 584         d->type = c->type;
 585         if (d->type == krb5_config_string)
 586             d->u.string = strdup(c->u.string);
 587         else if (d->type == krb5_config_list)
 588             _krb5_config_copy (context, c->u.list, &d->u.list);
 589         else
 590             krb5_abortx(context,
 591                         "unknown binding type (%d) in krb5_config_copy",
 592                         d->type);
 593         if (previous)
 594             previous->next = d;
 595
 596         previous = d;
 597         c = c->next;
 598     }
 599     return 0;
 600 }
 601
 602 #endif /* HEIMDAL_SMALLER */
 603
 604 KRB5_LIB_FUNCTION const void * KRB5_LIB_CALL
 605 _krb5_config_get_next (krb5_context context,
 606                        const krb5_config_section *c,
 607                        const krb5_config_binding **pointer,
 608                        int type,
 609                        ...)
 610 {
 611     const char *ret;
 612     va_list args;
 613
 614     va_start(args, type);
 615     ret = _krb5_config_vget_next (context, c, pointer, type, args);
 616     va_end(args);
 617     return ret;
 618 }
 619
 620 static const void *
 621 vget_next(krb5_context context,
 622           const krb5_config_binding *b,
 623           const krb5_config_binding **pointer,
 624           int type,
 625           const char *name,
 626           va_list args)
 627 {
 628     const char *p = va_arg(args, const char *);
 629     while(b != NULL) {
 630         if(strcmp(b->name, name) == 0) {
 631             if(b->type == (unsigned)type && p == NULL) {
 632                 *pointer = b;
 633                 return b->u.generic;
 634             } else if(b->type == krb5_config_list && p != NULL) {
 635                 return vget_next(context, b->u.list, pointer, type, p, args);
 636             }
 637         }
 638         b = b->next;
 639     }
 640     return NULL;
 641 }
 642
 643 KRB5_LIB_FUNCTION const void * KRB5_LIB_CALL
 644 _krb5_config_vget_next (krb5_context context,
 645                         const krb5_config_section *c,
 646                         const krb5_config_binding **pointer,
 647                         int type,
 648                         va_list args)
 649 {
 650     const krb5_config_binding *b;
 651     const char *p;
 652
 653     if(c == NULL)
 654         c = context->cf;
 655
 656     if (c == NULL)
 657         return NULL;
 658
 659     if (*pointer == NULL) {
 660         /* first time here, walk down the tree looking for the right
 661            section */
 662         p = va_arg(args, const char *);
 663         if (p == NULL)
 664             return NULL;
 665         return vget_next(context, c, pointer, type, p, args);
 666     }
 667
 668     /* we were called again, so just look for more entries with the
 669        same name and type */
 670     for (b = (*pointer)->next; b != NULL; b = b->next) {
 671         if(strcmp(b->name, (*pointer)->name) == 0 && b->type == (unsigned)type) {
 672             *pointer = b;
 673             return b->u.generic;
 674         }
 675     }
 676     return NULL;
 677 }
 678
 679 KRB5_LIB_FUNCTION const void * KRB5_LIB_CALL
 680 _krb5_config_get (krb5_context context,
 681                   const krb5_config_section *c,
 682                   int type,
 683                   ...)
 684 {
 685     const void *ret;
 686     va_list args;
 687
 688     va_start(args, type);
 689     ret = _krb5_config_vget (context, c, type, args);
 690     va_end(args);
 691     return ret;
 692 }
 693
 694
 695 KRB5_LIB_FUNCTION const void * KRB5_LIB_CALL
 696 _krb5_config_vget (krb5_context context,
 697                    const krb5_config_section *c,
 698                    int type,
 699                    va_list args)
 700 {
 701     const krb5_config_binding *foo = NULL;
 702
 703     return _krb5_config_vget_next (context, c, &foo, type, args);
 704 }
 705
 706 /**
 707  * Get a list of configuration binding list for more processing
 708  *
 709  * @param context A Kerberos 5 context.
 710  * @param c a configuration section, or NULL to use the section from context
 711  * @param ... a list of names, terminated with NULL.
 712  *
 713  * @return NULL if configuration list is not found, a list otherwise
 714  *
 715  * @ingroup krb5_support
 716  */
 717
 718 KRB5_LIB_FUNCTION const krb5_config_binding * KRB5_LIB_CALL
 719 krb5_config_get_list (krb5_context context,
 720                       const krb5_config_section *c,
 721                       ...)
 722 {
 723     const krb5_config_binding *ret;
 724     va_list args;
 725
 726     va_start(args, c);
 727     ret = krb5_config_vget_list (context, c, args);
 728     va_end(args);
 729     return ret;
 730 }
 731
 732 /**
 733  * Get a list of configuration binding list for more processing
 734  *
 735  * @param context A Kerberos 5 context.
 736  * @param c a configuration section, or NULL to use the section from context
 737  * @param args a va_list of arguments
 738  *
 739  * @return NULL if configuration list is not found, a list otherwise
 740  *
 741  * @ingroup krb5_support
 742  */
 743
 744 KRB5_LIB_FUNCTION const krb5_config_binding * KRB5_LIB_CALL
 745 krb5_config_vget_list (krb5_context context,
 746                        const krb5_config_section *c,
 747                        va_list args)
 748 {
 749     return _krb5_config_vget (context, c, krb5_config_list, args);
 750 }
 751
 752 /**
 753  * Returns a "const char *" to a string in the configuration database.
 754  * The string may not be valid after a reload of the configuration
 755  * database so a caller should make a local copy if it needs to keep
 756  * the string.
 757  *
 758  * @param context A Kerberos 5 context.
 759  * @param c a configuration section, or NULL to use the section from context
 760  * @param ... a list of names, terminated with NULL.
 761  *
 762  * @return NULL if configuration string not found, a string otherwise
 763  *
 764  * @ingroup krb5_support
 765  */
 766
 767 KRB5_LIB_FUNCTION const char* KRB5_LIB_CALL
 768 krb5_config_get_string (krb5_context context,
 769                         const krb5_config_section *c,
 770                         ...)
 771 {
 772     const char *ret;
 773     va_list args;
 774
 775     va_start(args, c);
 776     ret = krb5_config_vget_string (context, c, args);
 777     va_end(args);
 778     return ret;
 779 }
 780
 781 /**
 782  * Like krb5_config_get_string(), but uses a va_list instead of ...
 783  *
 784  * @param context A Kerberos 5 context.
 785  * @param c a configuration section, or NULL to use the section from context
 786  * @param args a va_list of arguments
 787  *
 788  * @return NULL if configuration string not found, a string otherwise
 789  *
 790  * @ingroup krb5_support
 791  */
 792
 793 KRB5_LIB_FUNCTION const char* KRB5_LIB_CALL
 794 krb5_config_vget_string (krb5_context context,
 795                          const krb5_config_section *c,
 796                          va_list args)
 797 {
 798     return _krb5_config_vget (context, c, krb5_config_string, args);
 799 }
 800
 801 /**
 802  * Like krb5_config_vget_string(), but instead of returning NULL,
 803  * instead return a default value.
 804  *
 805  * @param context A Kerberos 5 context.
 806  * @param c a configuration section, or NULL to use the section from context
 807  * @param def_value the default value to return if no configuration
 808  *        found in the database.
 809  * @param args a va_list of arguments
 810  *
 811  * @return a configuration string
 812  *
 813  * @ingroup krb5_support
 814  */
 815
 816 KRB5_LIB_FUNCTION const char* KRB5_LIB_CALL
 817 krb5_config_vget_string_default (krb5_context context,
 818                                  const krb5_config_section *c,
 819                                  const char *def_value,
 820                                  va_list args)
 821 {
 822     const char *ret;
 823
 824     ret = krb5_config_vget_string (context, c, args);
 825     if (ret == NULL)
 826         ret = def_value;
 827     return ret;
 828 }
 829
 830 /**
 831  * Like krb5_config_get_string(), but instead of returning NULL,
 832  * instead return a default value.
 833  *
 834  * @param context A Kerberos 5 context.
 835  * @param c a configuration section, or NULL to use the section from context
 836  * @param def_value the default value to return if no configuration
 837  *        found in the database.
 838  * @param ... a list of names, terminated with NULL.
 839  *
 840  * @return a configuration string
 841  *
 842  * @ingroup krb5_support
 843  */
 844
 845 KRB5_LIB_FUNCTION const char* KRB5_LIB_CALL
 846 krb5_config_get_string_default (krb5_context context,
 847                                 const krb5_config_section *c,
 848                                 const char *def_value,
 849                                 ...)
 850 {
 851     const char *ret;
 852     va_list args;
 853
 854     va_start(args, def_value);
 855     ret = krb5_config_vget_string_default (context, c, def_value, args);
 856     va_end(args);
 857     return ret;
 858 }
 859
 860 static char *
 861 next_component_string(char * begin, const char * delims, char **state)
 862 {
 863     char * end;
 864
 865     if (begin == NULL)
 866         begin = *state;
 867
 868     if (*begin == '\0')
 869         return NULL;
 870
 871     end = begin;
 872     while (*end == '"') {
 873         char * t = strchr(end + 1, '"');
 874
 875         if (t)
 876             end = ++t;
 877         else
 878             end += strlen(end);
 879     }
 880
 881     if (*end != '\0') {
 882         size_t pos;
 883
 884         pos = strcspn(end, delims);
 885         end = end + pos;
 886     }
 887
 888     if (*end != '\0') {
 889         *end = '\0';
 890         *state = end + 1;
 891         if (*begin == '"' && *(end - 1) == '"' && begin + 1 < end) {
 892             begin++; *(end - 1) = '\0';
 893         }
 894         return begin;
 895     }
 896
 897     *state = end;
 898     if (*begin == '"' && *(end - 1) == '"' && begin + 1 < end) {
 899         begin++; *(end - 1) = '\0';
 900     }
 901     return begin;
 902 }
 903
 904 /**
 905  * Get a list of configuration strings, free the result with
 906  * krb5_config_free_strings().
 907  *
 908  * @param context A Kerberos 5 context.
 909  * @param c a configuration section, or NULL to use the section from context
 910  * @param args a va_list of arguments
 911  *
 912  * @return TRUE or FALSE
 913  *
 914  * @ingroup krb5_support
 915  */
 916
 917 KRB5_LIB_FUNCTION char ** KRB5_LIB_CALL
 918 krb5_config_vget_strings(krb5_context context,
 919                          const krb5_config_section *c,
 920                          va_list args)
 921 {
 922     char **strings = NULL;
 923     int nstr = 0;
 924     const krb5_config_binding *b = NULL;
 925     const char *p;
 926
 927     while((p = _krb5_config_vget_next(context, c, &b,
 928                                       krb5_config_string, args))) {
 929         char *tmp = strdup(p);
 930         char *pos = NULL;
 931         char *s;
 932         if(tmp == NULL)
 933             goto cleanup;
 934         s = next_component_string(tmp, " \t", &pos);
 935         while(s){
 936             char **tmp2 = realloc(strings, (nstr + 1) * sizeof(*strings));
 937             if(tmp2 == NULL)
 938                 goto cleanup;
 939             strings = tmp2;
 940             strings[nstr] = strdup(s);
 941             nstr++;
 942             if(strings[nstr-1] == NULL)
 943                 goto cleanup;
 944             s = next_component_string(NULL, " \t", &pos);
 945         }
 946         free(tmp);
 947     }
 948     if(nstr){
 949         char **tmp = realloc(strings, (nstr + 1) * sizeof(*strings));
 950         if(tmp == NULL)
 951             goto cleanup;
 952         strings = tmp;
 953         strings[nstr] = NULL;
 954     }
 955     return strings;
 956 cleanup:
 957     while(nstr--)
 958         free(strings[nstr]);
 959     free(strings);
 960     return NULL;
 961
 962 }
 963
 964 /**
 965  * Get a list of configuration strings, free the result with
 966  * krb5_config_free_strings().
 967  *
 968  * @param context A Kerberos 5 context.
 969  * @param c a configuration section, or NULL to use the section from context
 970  * @param ... a list of names, terminated with NULL.
 971  *
 972  * @return TRUE or FALSE
 973  *
 974  * @ingroup krb5_support
 975  */
 976
 977 KRB5_LIB_FUNCTION char** KRB5_LIB_CALL
 978 krb5_config_get_strings(krb5_context context,
 979                         const krb5_config_section *c,
 980                         ...)
 981 {
 982     va_list ap;
 983     char **ret;
 984     va_start(ap, c);
 985     ret = krb5_config_vget_strings(context, c, ap);
 986     va_end(ap);
 987     return ret;
 988 }
 989
 990 /**
 991  * Free the resulting strings from krb5_config-get_strings() and
 992  * krb5_config_vget_strings().
 993  *
 994  * @param strings strings to free
 995  *
 996  * @ingroup krb5_support
 997  */
 998
 999 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
1000 krb5_config_free_strings(char **strings)
1001 {
1002     char **s = strings;
1003     while(s && *s){
1004         free(*s);
1005         s++;
1006     }
1007     free(strings);
1008 }
1009
1010 /**
1011  * Like krb5_config_get_bool_default() but with a va_list list of
1012  * configuration selection.
1013  *
1014  * Configuration value to a boolean value, where yes/true and any
1015  * non-zero number means TRUE and other value is FALSE.
1016  *
1017  * @param context A Kerberos 5 context.
1018  * @param c a configuration section, or NULL to use the section from context
1019  * @param def_value the default value to return if no configuration
1020  *        found in the database.
1021  * @param args a va_list of arguments
1022  *
1023  * @return TRUE or FALSE
1024  *
1025  * @ingroup krb5_support
1026  */
1027
1028 KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
1029 krb5_config_vget_bool_default (krb5_context context,
1030                                const krb5_config_section *c,
1031                                krb5_boolean def_value,
1032                                va_list args)
1033 {
1034     const char *str;
1035     str = krb5_config_vget_string (context, c, args);
1036     if(str == NULL)
1037         return def_value;
1038     if(strcasecmp(str, "yes") == 0 ||
1039        strcasecmp(str, "true") == 0 ||
1040        atoi(str)) return TRUE;
1041     return FALSE;
1042 }
1043
1044 /**
1045  * krb5_config_get_bool() will convert the configuration
1046  * option value to a boolean value, where yes/true and any non-zero
1047  * number means TRUE and other value is FALSE.
1048  *
1049  * @param context A Kerberos 5 context.
1050  * @param c a configuration section, or NULL to use the section from context
1051  * @param args a va_list of arguments
1052  *
1053  * @return TRUE or FALSE
1054  *
1055  * @ingroup krb5_support
1056  */
1057
1058 KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
1059 krb5_config_vget_bool  (krb5_context context,
1060                         const krb5_config_section *c,
1061                         va_list args)
1062 {
1063     return krb5_config_vget_bool_default (context, c, FALSE, args);
1064 }
1065
1066 /**
1067  * krb5_config_get_bool_default() will convert the configuration
1068  * option value to a boolean value, where yes/true and any non-zero
1069  * number means TRUE and other value is FALSE.
1070  *
1071  * @param context A Kerberos 5 context.
1072  * @param c a configuration section, or NULL to use the section from context
1073  * @param def_value the default value to return if no configuration
1074  *        found in the database.
1075  * @param ... a list of names, terminated with NULL.
1076  *
1077  * @return TRUE or FALSE
1078  *
1079  * @ingroup krb5_support
1080  */
1081
1082 KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
1083 krb5_config_get_bool_default (krb5_context context,
1084                               const krb5_config_section *c,
1085                               krb5_boolean def_value,
1086                               ...)
1087 {
1088     va_list ap;
1089     krb5_boolean ret;
1090     va_start(ap, def_value);
1091     ret = krb5_config_vget_bool_default(context, c, def_value, ap);
1092     va_end(ap);
1093     return ret;
1094 }
1095
1096 /**
1097  * Like krb5_config_get_bool() but with a va_list list of
1098  * configuration selection.
1099  *
1100  * Configuration value to a boolean value, where yes/true and any
1101  * non-zero number means TRUE and other value is FALSE.
1102  *
1103  * @param context A Kerberos 5 context.
1104  * @param c a configuration section, or NULL to use the section from context
1105  * @param ... a list of names, terminated with NULL.
1106  *
1107  * @return TRUE or FALSE
1108  *
1109  * @ingroup krb5_support
1110  */
1111
1112 KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
1113 krb5_config_get_bool (krb5_context context,
1114                       const krb5_config_section *c,
1115                       ...)
1116 {
1117     va_list ap;
1118     krb5_boolean ret;
1119     va_start(ap, c);
1120     ret = krb5_config_vget_bool (context, c, ap);
1121     va_end(ap);
1122     return ret;
1123 }
1124
1125 /**
1126  * Get the time from the configuration file using a relative time.
1127  *
1128  * Like krb5_config_get_time_default() but with a va_list list of
1129  * configuration selection.
1130  *
1131  * @param context A Kerberos 5 context.
1132  * @param c a configuration section, or NULL to use the section from context
1133  * @param def_value the default value to return if no configuration
1134  *        found in the database.
1135  * @param args a va_list of arguments
1136  *
1137  * @return parsed the time (or def_value on parse error)
1138  *
1139  * @ingroup krb5_support
1140  */
1141
1142 KRB5_LIB_FUNCTION int KRB5_LIB_CALL
1143 krb5_config_vget_time_default (krb5_context context,
1144                                const krb5_config_section *c,
1145                                int def_value,
1146                                va_list args)
1147 {
1148     const char *str;
1149     krb5_deltat t;
1150
1151     str = krb5_config_vget_string (context, c, args);
1152     if(str == NULL)
1153         return def_value;
1154     if (krb5_string_to_deltat(str, &t))
1155         return def_value;
1156     return t;
1157 }
1158
1159 /**
1160  * Get the time from the configuration file using a relative time, for example: 1h30s
1161  *
1162  * @param context A Kerberos 5 context.
1163  * @param c a configuration section, or NULL to use the section from context
1164  * @param args a va_list of arguments
1165  *
1166  * @return parsed the time or -1 on error
1167  *
1168  * @ingroup krb5_support
1169  */
1170
1171 KRB5_LIB_FUNCTION int KRB5_LIB_CALL
1172 krb5_config_vget_time  (krb5_context context,
1173                         const krb5_config_section *c,
1174                         va_list args)
1175 {
1176     return krb5_config_vget_time_default (context, c, -1, args);
1177 }
1178
1179 /**
1180  * Get the time from the configuration file using a relative time, for example: 1h30s
1181  *
1182  * @param context A Kerberos 5 context.
1183  * @param c a configuration section, or NULL to use the section from context
1184  * @param def_value the default value to return if no configuration
1185  *        found in the database.
1186  * @param ... a list of names, terminated with NULL.
1187  *
1188  * @return parsed the time (or def_value on parse error)
1189  *
1190  * @ingroup krb5_support
1191  */
1192
1193 KRB5_LIB_FUNCTION int KRB5_LIB_CALL
1194 krb5_config_get_time_default (krb5_context context,
1195                               const krb5_config_section *c,
1196                               int def_value,
1197                               ...)
1198 {
1199     va_list ap;
1200     int ret;
1201     va_start(ap, def_value);
1202     ret = krb5_config_vget_time_default(context, c, def_value, ap);
1203     va_end(ap);
1204     return ret;
1205 }
1206
1207 /**
1208  * Get the time from the configuration file using a relative time, for example: 1h30s
1209  *
1210  * @param context A Kerberos 5 context.
1211  * @param c a configuration section, or NULL to use the section from context
1212  * @param ... a list of names, terminated with NULL.
1213  *
1214  * @return parsed the time or -1 on error
1215  *
1216  * @ingroup krb5_support
1217  */
1218
1219 KRB5_LIB_FUNCTION int KRB5_LIB_CALL
1220 krb5_config_get_time (krb5_context context,
1221                       const krb5_config_section *c,
1222                       ...)
1223 {
1224     va_list ap;
1225     int ret;
1226     va_start(ap, c);
1227     ret = krb5_config_vget_time (context, c, ap);
1228     va_end(ap);
1229     return ret;
1230 }
1231
1232
1233 KRB5_LIB_FUNCTION int KRB5_LIB_CALL
1234 krb5_config_vget_int_default (krb5_context context,
1235                               const krb5_config_section *c,
1236                               int def_value,
1237                               va_list args)
1238 {
1239     const char *str;
1240     str = krb5_config_vget_string (context, c, args);
1241     if(str == NULL)
1242         return def_value;
1243     else {
1244         char *endptr;
1245         long l;
1246         l = strtol(str, &endptr, 0);
1247         if (endptr == str)
1248             return def_value;
1249         else
1250             return l;
1251     }
1252 }
1253
1254 KRB5_LIB_FUNCTION int KRB5_LIB_CALL
1255 krb5_config_vget_int  (krb5_context context,
1256                        const krb5_config_section *c,
1257                        va_list args)
1258 {
1259     return krb5_config_vget_int_default (context, c, -1, args);
1260 }
1261
1262 KRB5_LIB_FUNCTION int KRB5_LIB_CALL
1263 krb5_config_get_int_default (krb5_context context,
1264                              const krb5_config_section *c,
1265                              int def_value,
1266                              ...)
1267 {
1268     va_list ap;
1269     int ret;
1270     va_start(ap, def_value);
1271     ret = krb5_config_vget_int_default(context, c, def_value, ap);
1272     va_end(ap);
1273     return ret;
1274 }
1275
1276 KRB5_LIB_FUNCTION int KRB5_LIB_CALL
1277 krb5_config_get_int (krb5_context context,
1278                      const krb5_config_section *c,
1279                      ...)
1280 {
1281     va_list ap;
1282     int ret;
1283     va_start(ap, c);
1284     ret = krb5_config_vget_int (context, c, ap);
1285     va_end(ap);
1286     return ret;
1287 }
1288
1289
1290 #ifndef HEIMDAL_SMALLER
1291
1292 /**
1293  * Deprecated: configuration files are not strings
1294  *
1295  * @ingroup krb5_deprecated
1296  */
1297
1298 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1299 krb5_config_parse_string_multi(krb5_context context,
1300                                const char *string,
1301                                krb5_config_section **res)
1302     KRB5_DEPRECATED_FUNCTION("Use X instead")
1303 {
1304     const char *str;
1305     unsigned lineno = 0;
1306     krb5_error_code ret;
1307     struct fileptr f;
1308     f.f = NULL;
1309     f.s = string;
1310
1311     ret = krb5_config_parse_debug (&f, res, &lineno, &str);
1312     if (ret) {
1313         krb5_set_error_message (context, ret, "%s:%u: %s",
1314                                 "<constant>", lineno, str);
1315         return ret;
1316     }
1317     return 0;
1318 }
1319
1320 #endif