keydb_fs.c

   1 /*
   2  * keydb_fs.c - Routines to store and fetch keys in a filesystem hierarchy.
   3  *
   4  * Copyright 2004 Daniel Silverstone <dsilvers@digital-scurf.org>
   5  *
   6  * This program is free software: you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc., 51
  17  * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  */
  19
  20 #include <sys/types.h>
  21 #include <sys/uio.h>
  22 #include <sys/stat.h>
  23 #include <errno.h>
  24 #include <fcntl.h>
  25 #include <inttypes.h>
  26 #include <stdbool.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <limits.h>
  32 #include <dirent.h>
  33
  34 #include "charfuncs.h"
  35 #include "decodekey.h"
  36 #include "keydb.h"
  37 #include "keyid.h"
  38 #include "keystructs.h"
  39 #include "ll.h"
  40 #include "mem.h"
  41 #include "onak.h"
  42 #include "onak-conf.h"
  43 #include "parsekey.h"
  44 #include "log.h"
  45 #include "wordlist.h"
  46
  47 /* Hack: We should really dynamically allocate our path buffers */
  48 #ifndef PATH_MAX
  49 #define PATH_MAX 1024
  50 #endif
  51
  52 struct onak_fs_dbctx {
  53         int lockfile_fd;
  54         bool lockfile_readonly;
  55 };
  56
  57 /*****************************************************************************/
  58
  59 /* Helper functions */
  60
  61 #define FNV_offset_basis 2166136261ul
  62 #define FNV_mixing_prime 16777619ul
  63
  64 static uint32_t calchash(uint8_t * ptr)
  65 {
  66         register uint32_t h = FNV_offset_basis;
  67         register uint32_t p = FNV_mixing_prime;
  68         register uint32_t n = strlen((char *) ptr);
  69         register uint8_t *c = ptr;
  70         while (n--) {
  71                 h *= p;
  72                 h ^= *c++;
  73         }
  74         return h ? h : 1;       /* prevent a hash of zero happening */
  75 }
  76
  77
  78 static void keypath(char *buffer, size_t length, uint64_t _keyid,
  79                 char *basepath)
  80 {
  81         uint64_t keyid = _keyid << 32;
  82         snprintf(buffer, length, "%s/key/%02X/%02X/%08X/%016" PRIX64,
  83                  basepath, (uint8_t) ((keyid >> 56) & 0xFF),
  84                  (uint8_t) ((keyid >> 48) & 0xFF),
  85                  (uint32_t) (keyid >> 32), _keyid);
  86 }
  87
  88 static void keydir(char *buffer, size_t length, uint64_t _keyid,
  89                 char *basepath)
  90 {
  91         uint64_t keyid = _keyid << 32;
  92         snprintf(buffer, length, "%s/key/%02X/%02X/%08X", basepath,
  93                  (uint8_t) ((keyid >> 56) & 0xFF),
  94                  (uint8_t) ((keyid >> 48) & 0xFF),
  95                  (uint32_t) (keyid >> 32));
  96 }
  97
  98 static void prove_path_to(uint64_t keyid, char *what, char *basepath)
  99 {
 100         static char buffer[PATH_MAX];
 101         snprintf(buffer, sizeof(buffer), "%s/%s", basepath, what);
 102         mkdir(buffer, 0777);
 103
 104         snprintf(buffer, sizeof(buffer), "%s/%s/%02X", basepath, what,
 105                  (uint8_t) ((keyid >> 24) & 0xFF));
 106         mkdir(buffer, 0777);
 107
 108         snprintf(buffer, sizeof(buffer), "%s/%s/%02X/%02X", basepath,
 109                  what,
 110                  (uint8_t) ((keyid >> 24) & 0xFF),
 111                  (uint8_t) ((keyid >> 16) & 0xFF));
 112         mkdir(buffer, 0777);
 113
 114         snprintf(buffer, sizeof(buffer), "%s/%s/%02X/%02X/%08X", basepath,
 115                  what,
 116                  (uint8_t) ((keyid >> 24) & 0xFF),
 117                  (uint8_t) ((keyid >> 16) & 0xFF), (uint32_t) (keyid));
 118         mkdir(buffer, 0777);
 119 }
 120
 121 static void wordpath(char *buffer, size_t length, char *word, uint32_t hash,
 122                 uint64_t keyid, char *basepath)
 123 {
 124         snprintf(buffer, length, "%s/words/%02X/%02X/%08X/%s/%016" PRIX64,
 125                  basepath, (uint8_t) ((hash >> 24) & 0xFF),
 126                  (uint8_t) ((hash >> 16) & 0xFF), hash, word, keyid);
 127 }
 128
 129 static void worddir(char *buffer, size_t length, char *word, uint32_t hash,
 130                 char *basepath)
 131 {
 132         snprintf(buffer, length, "%s/words/%02X/%02X/%08X/%s", basepath,
 133                  (uint8_t) ((hash >> 24) & 0xFF),
 134                  (uint8_t) ((hash >> 16) & 0xFF), hash, word);
 135 }
 136
 137 static void subkeypath(char *buffer, size_t length, uint64_t subkey,
 138                 char *basepath)
 139 {
 140         snprintf(buffer, length, "%s/subkeys/%02X/%02X/%08X/%016" PRIX64,
 141                  basepath,
 142                  (uint8_t) ((subkey >> 24) & 0xFF),
 143                  (uint8_t) ((subkey >> 16) & 0xFF),
 144                  (uint32_t) (subkey & 0xFFFFFFFF),
 145                  subkey);
 146 }
 147
 148 static void subkeydir(char *buffer, size_t length, uint64_t subkey,
 149                 char *basepath)
 150 {
 151         snprintf(buffer, length, "%s/subkeys/%02X/%02X/%08X",
 152                  basepath,
 153                  (uint8_t) ((subkey >> 24) & 0xFF),
 154                  (uint8_t) ((subkey >> 16) & 0xFF),
 155                  (uint32_t) (subkey & 0xFFFFFFFF));
 156 }
 157
 158 static void skshashpath(char *buffer, size_t length,
 159                 const struct skshash *hash, char *basepath)
 160 {
 161         snprintf(buffer, length, "%s/skshash/%02X/%02X/%02X%02X%02X%02X/"
 162                 "%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",
 163                  basepath,
 164                  hash->hash[0], hash->hash[1],
 165                  hash->hash[0], hash->hash[1], hash->hash[2], hash->hash[3],
 166                  hash->hash[4], hash->hash[5], hash->hash[6], hash->hash[7],
 167                  hash->hash[8], hash->hash[9], hash->hash[10], hash->hash[11],
 168                  hash->hash[12], hash->hash[13], hash->hash[14],
 169                  hash->hash[15]);
 170 }
 171
 172 /*****************************************************************************/
 173
 174 /**
 175  *      starttrans - Start a transaction.
 176  */
 177 static bool fs_starttrans(struct onak_dbctx *dbctx)
 178 {
 179         struct onak_fs_dbctx *privctx = (struct onak_fs_dbctx *) dbctx->priv;
 180         struct flock lockstruct;
 181         int remaining = 20;
 182         lockstruct.l_type =
 183             F_RDLCK | ((privctx->lockfile_readonly) ? 0 : F_WRLCK);
 184         lockstruct.l_whence = SEEK_SET;
 185         lockstruct.l_start = 0;
 186         lockstruct.l_len = 1;
 187
 188         while (fcntl(privctx->lockfile_fd, F_SETLK, &lockstruct) == -1) {
 189                 if (remaining-- == 0)
 190                         return false;   /* Hope to hell that noodles DTRT */
 191                 usleep(100);
 192         }
 193         return true;
 194 }
 195
 196 /**
 197  *      endtrans - End a transaction.
 198  */
 199 static void fs_endtrans(struct onak_dbctx *dbctx)
 200 {
 201         struct onak_fs_dbctx *privctx = (struct onak_fs_dbctx *) dbctx->priv;
 202         struct flock lockstruct;
 203
 204         lockstruct.l_type = F_UNLCK;
 205         lockstruct.l_whence = SEEK_SET;
 206         lockstruct.l_start = 0;
 207         lockstruct.l_len = 1;
 208         fcntl(privctx->lockfile_fd, F_SETLK, &lockstruct);
 209 }
 210
 211 static uint64_t fs_getfullkeyid(struct onak_dbctx *dbctx, uint64_t keyid)
 212 {
 213         static char buffer[PATH_MAX];
 214         DIR *d = NULL;
 215         struct dirent *de = NULL;
 216         uint64_t ret = 0;
 217
 218         keydir(buffer, sizeof(buffer), keyid, dbctx->config->location);
 219
 220         d = opendir(buffer);
 221         if (d) {
 222                 do {
 223                         de = readdir(d);
 224                         if (de && de->d_name[0] != '.') {
 225                                 ret = strtoull(de->d_name, NULL, 16);
 226                         }
 227                 } while (de && de->d_name[0] == '.');
 228                 closedir(d);
 229         }
 230
 231         if (ret == 0) {
 232                 subkeydir(buffer, sizeof(buffer), keyid,
 233                         dbctx->config->location);
 234
 235                 d = opendir(buffer);
 236                 if (d) {
 237                         do {
 238                                 de = readdir(d);
 239                                 if (de && de->d_name[0] != '.') {
 240                                         ret = strtoull(de->d_name, NULL, 16);
 241                                 }
 242                         } while (de && de->d_name[0] == '.');
 243                         closedir(d);
 244                 }
 245         }
 246
 247         return ret;
 248 }
 249
 250 /**
 251  *      fetch_key - Given a keyid fetch the key from storage.
 252  *      @keyid: The keyid to fetch.
 253  *      @publickey: A pointer to a structure to return the key in.
 254  *      @intrans: If we're already in a transaction.
 255  */
 256 static int fs_fetch_key_id(struct onak_dbctx *dbctx,
 257               uint64_t keyid,
 258               struct openpgp_publickey **publickey,
 259               bool intrans)
 260 {
 261         static char buffer[PATH_MAX];
 262         int ret = 0, fd;
 263         struct openpgp_packet_list *packets = NULL;
 264
 265         if (!intrans)
 266                 fs_starttrans(dbctx);
 267
 268         if ((keyid >> 32) == 0)
 269                 keyid = fs_getfullkeyid(dbctx, keyid);
 270
 271         keypath(buffer, sizeof(buffer), keyid, dbctx->config->location);
 272         fd = open(buffer, O_RDONLY);
 273         if (fd == -1 && errno == ENOENT) {
 274                 subkeypath(buffer, sizeof(buffer), keyid,
 275                         dbctx->config->location);
 276                 fd = open(buffer, O_RDONLY);
 277         }
 278
 279         if (fd != -1) {
 280                 /* File is present, load it in... */
 281                 read_openpgp_stream(file_fetchchar, &fd, &packets, 0);
 282                 parse_keys(packets, publickey);
 283                 free_packet_list(packets);
 284                 packets = NULL;
 285                 close(fd);
 286                 ret = 1;
 287         }
 288
 289         if (!intrans)
 290                 fs_endtrans(dbctx);
 291         return ret;
 292 }
 293
 294 /**
 295  *      store_key - Takes a key and stores it.
 296  *      @publickey: A pointer to the public key to store.
 297  *      @intrans: If we're already in a transaction.
 298  *      @update: If true the key exists and should be updated.
 299  */
 300 static int fs_store_key(struct onak_dbctx *dbctx,
 301               struct openpgp_publickey *publickey, bool intrans,
 302               bool update)
 303 {
 304         static char buffer[PATH_MAX];
 305         static char wbuffer[PATH_MAX];
 306         int ret = 0, fd;
 307         struct openpgp_packet_list *packets = NULL;
 308         struct openpgp_packet_list *list_end = NULL;
 309         struct openpgp_publickey *next = NULL;
 310         uint64_t keyid;
 311         struct ll *wordlist = NULL, *wl = NULL;
 312         struct skshash hash;
 313         struct openpgp_fingerprint *subkeyids = NULL;
 314         uint32_t hashid;
 315         int i = 0;
 316
 317         if (get_keyid(publickey, &keyid) != ONAK_E_OK) {
 318                 logthing(LOGTHING_ERROR, "Couldn't find key ID for key.");
 319                 return 0;
 320         }
 321
 322         if (!intrans)
 323                 fs_starttrans(dbctx);
 324
 325         prove_path_to(keyid, "key", dbctx->config->location);
 326         keypath(buffer, sizeof(buffer), keyid, dbctx->config->location);
 327
 328         if ((fd =
 329              open(buffer, O_WRONLY | (update ? O_TRUNC : O_CREAT),
 330                   0644)) != -1) {
 331                 next = publickey->next;
 332                 publickey->next = NULL;
 333                 flatten_publickey(publickey, &packets, &list_end);
 334                 publickey->next = next;
 335
 336                 write_openpgp_stream(file_putchar, &fd, packets);
 337                 close(fd);
 338                 free_packet_list(packets);
 339                 packets = NULL;
 340                 ret = 1;
 341         }
 342
 343         if (ret) {
 344                 wl = wordlist = makewordlistfromkey(wordlist, publickey);
 345                 while (wl) {
 346                         uint32_t hash = calchash((uint8_t *) (wl->object));
 347                         prove_path_to(hash, "words", dbctx->config->location);
 348
 349                         worddir(wbuffer, sizeof(wbuffer), wl->object, hash,
 350                                 dbctx->config->location);
 351                         mkdir(wbuffer, 0777);
 352                         wordpath(wbuffer, sizeof(wbuffer), wl->object, hash,
 353                                 keyid, dbctx->config->location);
 354                         link(buffer, wbuffer);
 355
 356                         wl = wl->next;
 357                 }
 358                 llfree(wordlist, free);
 359
 360                 subkeyids = keysubkeys(publickey);
 361                 i = 0;
 362                 while (subkeyids != NULL && subkeyids[i].length != 0) {
 363                         keyid = fingerprint2keyid(&subkeyids[i]);
 364
 365                         prove_path_to(keyid, "subkeys",
 366                                 dbctx->config->location);
 367
 368                         subkeydir(wbuffer, sizeof(wbuffer), keyid,
 369                                 dbctx->config->location);
 370                         mkdir(wbuffer, 0777);
 371                         subkeypath(wbuffer, sizeof(wbuffer), keyid,
 372                                 dbctx->config->location);
 373                         link(buffer, wbuffer);
 374
 375                         i++;
 376                 }
 377                 if (subkeyids != NULL) {
 378                         free(subkeyids);
 379                         subkeyids = NULL;
 380                 }
 381
 382                 get_skshash(publickey, &hash);
 383                 hashid = (hash.hash[0] << 24) + (hash.hash[1] << 16) +
 384                                 (hash.hash[2] << 8) + hash.hash[3];
 385                 prove_path_to(hashid, "skshash", dbctx->config->location);
 386                 skshashpath(wbuffer, sizeof(wbuffer), &hash,
 387                         dbctx->config->location);
 388                 link(buffer, wbuffer);
 389         }
 390
 391         if (!intrans)
 392                 fs_endtrans(dbctx);
 393         return ret;
 394 }
 395
 396 /**
 397  *      delete_key - Given a keyid delete the key from storage.
 398  *      @keyid: The keyid to delete.
 399  *      @intrans: If we're already in a transaction.
 400  */
 401 static int fs_delete_key(struct onak_dbctx *dbctx, uint64_t keyid, bool intrans)
 402 {
 403         static char buffer[PATH_MAX];
 404         int ret;
 405         struct openpgp_publickey *pk = NULL;
 406         struct skshash hash;
 407         struct ll *wordlist = NULL, *wl = NULL;
 408         struct openpgp_fingerprint *subkeyids = NULL;
 409         uint64_t subkeyid;
 410         int i = 0;
 411
 412         if ((keyid >> 32) == 0)
 413                 keyid = fs_getfullkeyid(dbctx, keyid);
 414
 415         if (!intrans)
 416                 fs_starttrans(dbctx);
 417
 418         ret = fs_fetch_key_id(dbctx, keyid, &pk, true);
 419
 420         if (ret) {
 421                 logthing(LOGTHING_DEBUG, "Wordlist for key %016" PRIX64,
 422                          keyid);
 423                 wl = wordlist = makewordlistfromkey(wordlist, pk);
 424                 logthing(LOGTHING_DEBUG,
 425                          "Wordlist for key %016" PRIX64 " done", keyid);
 426                 while (wl) {
 427                         uint32_t hash = calchash((uint8_t *) (wl->object));
 428                         prove_path_to(hash, "words", dbctx->config->location);
 429
 430                         wordpath(buffer, sizeof(buffer), wl->object, hash,
 431                                 keyid, dbctx->config->location);
 432                         unlink(buffer);
 433
 434                         wl = wl->next;
 435                 }
 436
 437                 subkeyids = keysubkeys(pk);
 438                 i = 0;
 439                 while (subkeyids != NULL && subkeyids[i].length != 0) {
 440                         subkeyid = fingerprint2keyid(&subkeyids[i]);
 441                         prove_path_to(subkeyid, "subkeys",
 442                                 dbctx->config->location);
 443
 444                         subkeypath(buffer, sizeof(buffer), subkeyid,
 445                                 dbctx->config->location);
 446                         unlink(buffer);
 447
 448                         i++;
 449                 }
 450                 if (subkeyids != NULL) {
 451                         free(subkeyids);
 452                         subkeyids = NULL;
 453                 }
 454
 455                 get_skshash(pk, &hash);
 456                 skshashpath(buffer, sizeof(buffer), &hash,
 457                         dbctx->config->location);
 458                 unlink(buffer);
 459         }
 460
 461         keypath(buffer, sizeof(buffer), keyid, dbctx->config->location);
 462         unlink(buffer);
 463
 464         if (!intrans)
 465                 fs_endtrans(dbctx);
 466         return 1;
 467 }
 468
 469 static struct ll *internal_get_key_by_word(char *word, struct ll *mct,
 470                 char *basepath)
 471 {
 472         struct ll *keys = NULL;
 473         DIR *d = NULL;
 474         char buffer[PATH_MAX];
 475         uint32_t hash = calchash((uint8_t *) (word));
 476         struct dirent *de;
 477
 478         worddir(buffer, sizeof(buffer), word, hash, basepath);
 479         d = opendir(buffer);
 480         logthing(LOGTHING_DEBUG, "Scanning for word %s in dir %s", word,
 481                  buffer);
 482         if (d) {
 483                 do {
 484                         de = readdir(d);
 485                         if (de && de->d_name[0] != '.') {
 486                                 if ((!mct)
 487                                     || (llfind(mct, de->d_name,
 488                                         (int (*)(const void *, const void *))
 489                                                     strcmp) !=
 490                                         NULL)) {
 491                                         logthing(LOGTHING_DEBUG,
 492                                                  "Found %s // %s", word,
 493                                                  de->d_name);
 494                                         keys =
 495                                             lladd(keys,
 496                                                   strdup(de->d_name));
 497                                 }
 498                         }
 499                 } while (de);
 500                 closedir(d);
 501         }
 502
 503         return keys;
 504 }
 505
 506 /*
 507  *      fetch_key_text - Trys to find the keys that contain the supplied text.
 508  *      @search: The text to search for.
 509  *      @publickey: A pointer to a structure to return the key in.
 510  */
 511 static int fs_fetch_key_text(struct onak_dbctx *dbctx,
 512                    const char *search,
 513                    struct openpgp_publickey **publickey)
 514 {
 515         struct ll *wordlist = NULL, *wl = NULL;
 516         struct ll *keylist = NULL;
 517         char      *searchtext = NULL;
 518         int addedkeys = 0;
 519
 520         logthing(LOGTHING_DEBUG, "Search was '%s'", search);
 521
 522         searchtext = strdup(search);
 523         wl = wordlist = makewordlist(wordlist, searchtext);
 524
 525         keylist = internal_get_key_by_word(wordlist->object, NULL,
 526                 dbctx->config->location);
 527
 528         if (!keylist) {
 529                 llfree(wordlist, NULL);
 530                 free(searchtext);
 531                 searchtext = NULL;
 532                 return 0;
 533         }
 534
 535         wl = wl->next;
 536         while (wl) {
 537                 struct ll *nkl =
 538                     internal_get_key_by_word(wl->object, keylist,
 539                         dbctx->config->location);
 540                 if (!nkl) {
 541                         llfree(wordlist, NULL);
 542                         llfree(keylist, free);
 543                         free(searchtext);
 544                         searchtext = NULL;
 545                         return 0;
 546                 }
 547                 llfree(keylist, free);
 548                 keylist = nkl;
 549                 wl = wl->next;
 550         }
 551
 552         llfree(wordlist, NULL);
 553
 554         /* Now add the keys... */
 555         wl = keylist;
 556         while (wl) {
 557                 logthing(LOGTHING_DEBUG, "Adding key: %s", wl->object);
 558                 addedkeys +=
 559                     fs_fetch_key_id(dbctx,
 560                               strtoull(wl->object, NULL, 16), publickey,
 561                               false);
 562                 if (addedkeys >= config.maxkeys)
 563                         break;
 564                 wl = wl->next;
 565         }
 566
 567         llfree(keylist, free);
 568         free(searchtext);
 569         searchtext = NULL;
 570
 571         return addedkeys;
 572 }
 573
 574 /**
 575  *      fetch_key_skshash - Given an SKS hash fetch the key from storage.
 576  *      @hash: The hash to fetch.
 577  *      @publickey: A pointer to a structure to return the key in.
 578  *      @intrans: If we're already in a transaction.
 579  */
 580 static int fs_fetch_key_skshash(struct onak_dbctx *dbctx,
 581               const struct skshash *hash,
 582               struct openpgp_publickey **publickey)
 583 {
 584         static char buffer[PATH_MAX];
 585         int ret = 0, fd;
 586         struct openpgp_packet_list *packets = NULL;
 587
 588         skshashpath(buffer, sizeof(buffer), hash, dbctx->config->location);
 589         if ((fd = open(buffer, O_RDONLY)) != -1) {
 590                 read_openpgp_stream(file_fetchchar, &fd, &packets, 0);
 591                 parse_keys(packets, publickey);
 592                 free_packet_list(packets);
 593                 packets = NULL;
 594                 close(fd);
 595                 ret = 1;
 596         }
 597
 598         return ret;
 599 }
 600
 601 /**
 602  *      iterate_keys - call a function once for each key in the db.
 603  *      @iterfunc: The function to call.
 604  *      @ctx: A context pointer
 605  *
 606  *      Calls iterfunc once for each key in the database. ctx is passed
 607  *      unaltered to iterfunc. This function is intended to aid database dumps
 608  *      and statistic calculations.
 609  *
 610  *      Returns the number of keys we iterated over.
 611  */
 612 static int fs_iterate_keys(struct onak_dbctx *dbctx,
 613                 void (*iterfunc)(void *ctx,
 614                 struct openpgp_publickey *key), void *ctx)
 615 {
 616         return 0;
 617 }
 618
 619 /*
 620  * Include the basic keydb routines.
 621  */
 622 #define NEED_KEYID2UID 1
 623 #define NEED_GETKEYSIGS 1
 624 #define NEED_UPDATEKEYS 1
 625 #define NEED_GET_FP 1
 626 #include "keydb.c"
 627
 628 /**
 629  *      cleanupdb - De-initialize the key database.
 630  */
 631 static void fs_cleanupdb(struct onak_dbctx *dbctx)
 632 {
 633         struct onak_fs_dbctx *privctx = (struct onak_fs_dbctx *) dbctx->priv;
 634
 635         /* Mmmm nothing to do here? */
 636         close(privctx->lockfile_fd);
 637 }
 638
 639 /**
 640  *      initdb - Initialize the key database.
 641  */
 642 struct onak_dbctx *keydb_fs_init(struct onak_db_config *dbcfg, bool readonly)
 643 {
 644         char buffer[PATH_MAX];
 645         struct onak_dbctx *dbctx;
 646         struct onak_fs_dbctx *privctx;
 647
 648         dbctx = malloc(sizeof(struct onak_dbctx));
 649         if (dbctx == NULL) {
 650                 return NULL;
 651         }
 652         dbctx->config = dbcfg;
 653         dbctx->priv = privctx = malloc(sizeof(*privctx));
 654         if (privctx == NULL) {
 655                 free(dbctx);
 656                 return NULL;
 657         }
 658
 659         privctx->lockfile_readonly = readonly;
 660
 661         snprintf(buffer, sizeof(buffer), "%s/.lock", dbcfg->location);
 662
 663         if (access(dbcfg->location, R_OK | W_OK | X_OK) == -1) {
 664                 if (errno != ENOENT) {
 665                         logthing(LOGTHING_CRITICAL,
 666                                  "Unable to access keydb_fs root of '%s'. (%s)",
 667                                  dbcfg->location, strerror(errno));
 668                         exit(1);        /* Lacking rwx on the key dir */
 669                 }
 670                 mkdir(dbcfg->location, 0777);
 671                 privctx->lockfile_fd = open(buffer, O_RDWR | O_CREAT, 0600);
 672         }
 673         if (chdir(dbcfg->location) == -1) {
 674                 /* Shouldn't happen after the above */
 675                 logthing(LOGTHING_CRITICAL,
 676                         "Couldn't change to database directory: %s",
 677                         strerror(errno));
 678                 free(dbctx->priv);
 679                 free(dbctx);
 680                 return NULL;
 681         }
 682         privctx->lockfile_fd = open(buffer,
 683                                  (privctx->lockfile_readonly) ?
 684                                  O_RDONLY : O_RDWR);
 685         if (privctx->lockfile_fd == -1)
 686                 privctx->lockfile_fd = open(buffer, O_RDWR | O_CREAT, 0600);
 687         if (privctx->lockfile_fd == -1) {
 688                 logthing(LOGTHING_CRITICAL,
 689                          "Unable to open lockfile '%s'. (%s)",
 690                          buffer, strerror(errno));
 691                 exit(1);        /* Lacking rwx on the key dir */
 692         }
 693
 694         dbctx->cleanupdb                = fs_cleanupdb;
 695         dbctx->starttrans               = fs_starttrans;
 696         dbctx->endtrans                 = fs_endtrans;
 697         dbctx->fetch_key_id             = fs_fetch_key_id;
 698         dbctx->fetch_key_fp             = generic_fetch_key_fp;
 699         dbctx->fetch_key_text           = fs_fetch_key_text;
 700         dbctx->fetch_key_skshash        = fs_fetch_key_skshash;
 701         dbctx->store_key                = fs_store_key;
 702         dbctx->update_keys              = generic_update_keys;
 703         dbctx->delete_key               = fs_delete_key;
 704         dbctx->getkeysigs               = generic_getkeysigs;
 705         dbctx->cached_getkeysigs        = generic_cached_getkeysigs;
 706         dbctx->keyid2uid                = generic_keyid2uid;
 707         dbctx->getfullkeyid             = fs_getfullkeyid;
 708         dbctx->iterate_keys             = fs_iterate_keys;
 709
 710         return dbctx;
 711 }