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, see <https://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <sys/types.h>
  20 #include <sys/uio.h>
  21 #include <sys/stat.h>
  22 #include <errno.h>
  23 #include <fcntl.h>
  24 #include <inttypes.h>
  25 #include <stdbool.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30 #include <limits.h>
  31 #include <dirent.h>
  32
  33 #include "charfuncs.h"
  34 #include "decodekey.h"
  35 #include "keydb.h"
  36 #include "keyid.h"
  37 #include "keystructs.h"
  38 #include "ll.h"
  39 #include "mem.h"
  40 #include "onak.h"
  41 #include "onak-conf.h"
  42 #include "parsekey.h"
  43 #include "log.h"
  44 #include "wordlist.h"
  45
  46 /* Hack: We should really dynamically allocate our path buffers */
  47 #ifndef PATH_MAX
  48 #define PATH_MAX 1024
  49 #endif
  50
  51 struct onak_fs_dbctx {
  52         int lockfile_fd;
  53         bool lockfile_readonly;
  54 };
  55
  56 /*****************************************************************************/
  57
  58 /* Helper functions */
  59
  60 #define FNV_offset_basis 2166136261ul
  61 #define FNV_mixing_prime 16777619ul
  62
  63 static uint32_t calchash(uint8_t * ptr)
  64 {
  65         register uint32_t h = FNV_offset_basis;
  66         register uint32_t p = FNV_mixing_prime;
  67         register uint32_t n = strlen((char *) ptr);
  68         register uint8_t *c = ptr;
  69         while (n--) {
  70                 h *= p;
  71                 h ^= *c++;
  72         }
  73         return h ? h : 1;       /* prevent a hash of zero happening */
  74 }
  75
  76
  77 static void keypath(char *buffer, size_t length, uint64_t _keyid,
  78                 char *basepath)
  79 {
  80         uint64_t keyid = _keyid << 32;
  81         snprintf(buffer, length, "%s/key/%02X/%02X/%08X/%016" PRIX64,
  82                  basepath, (uint8_t) ((keyid >> 56) & 0xFF),
  83                  (uint8_t) ((keyid >> 48) & 0xFF),
  84                  (uint32_t) (keyid >> 32), _keyid);
  85 }
  86
  87 static void keydir(char *buffer, size_t length, uint64_t _keyid,
  88                 char *basepath)
  89 {
  90         uint64_t keyid = _keyid << 32;
  91         snprintf(buffer, length, "%s/key/%02X/%02X/%08X", basepath,
  92                  (uint8_t) ((keyid >> 56) & 0xFF),
  93                  (uint8_t) ((keyid >> 48) & 0xFF),
  94                  (uint32_t) (keyid >> 32));
  95 }
  96
  97 static void prove_path_to(uint64_t keyid, char *what, char *basepath)
  98 {
  99         static char buffer[PATH_MAX];
 100         snprintf(buffer, sizeof(buffer), "%s/%s", basepath, what);
 101         mkdir(buffer, 0777);
 102
 103         snprintf(buffer, sizeof(buffer), "%s/%s/%02X", basepath, what,
 104                  (uint8_t) ((keyid >> 24) & 0xFF));
 105         mkdir(buffer, 0777);
 106
 107         snprintf(buffer, sizeof(buffer), "%s/%s/%02X/%02X", basepath,
 108                  what,
 109                  (uint8_t) ((keyid >> 24) & 0xFF),
 110                  (uint8_t) ((keyid >> 16) & 0xFF));
 111         mkdir(buffer, 0777);
 112
 113         snprintf(buffer, sizeof(buffer), "%s/%s/%02X/%02X/%08X", basepath,
 114                  what,
 115                  (uint8_t) ((keyid >> 24) & 0xFF),
 116                  (uint8_t) ((keyid >> 16) & 0xFF), (uint32_t) (keyid));
 117         mkdir(buffer, 0777);
 118 }
 119
 120 static void wordpath(char *buffer, size_t length, char *word, uint32_t hash,
 121                 uint64_t keyid, char *basepath)
 122 {
 123         snprintf(buffer, length, "%s/words/%02X/%02X/%08X/%s/%016" PRIX64,
 124                  basepath, (uint8_t) ((hash >> 24) & 0xFF),
 125                  (uint8_t) ((hash >> 16) & 0xFF), hash, word, keyid);
 126 }
 127
 128 static void worddir(char *buffer, size_t length, char *word, uint32_t hash,
 129                 char *basepath)
 130 {
 131         snprintf(buffer, length, "%s/words/%02X/%02X/%08X/%s", basepath,
 132                  (uint8_t) ((hash >> 24) & 0xFF),
 133                  (uint8_t) ((hash >> 16) & 0xFF), hash, word);
 134 }
 135
 136 static void subkeypath(char *buffer, size_t length, uint64_t subkey,
 137                 char *basepath)
 138 {
 139         snprintf(buffer, length, "%s/subkeys/%02X/%02X/%08X/%016" PRIX64,
 140                  basepath,
 141                  (uint8_t) ((subkey >> 24) & 0xFF),
 142                  (uint8_t) ((subkey >> 16) & 0xFF),
 143                  (uint32_t) (subkey & 0xFFFFFFFF),
 144                  subkey);
 145 }
 146
 147 static void subkeydir(char *buffer, size_t length, uint64_t subkey,
 148                 char *basepath)
 149 {
 150         snprintf(buffer, length, "%s/subkeys/%02X/%02X/%08X",
 151                  basepath,
 152                  (uint8_t) ((subkey >> 24) & 0xFF),
 153                  (uint8_t) ((subkey >> 16) & 0xFF),
 154                  (uint32_t) (subkey & 0xFFFFFFFF));
 155 }
 156
 157 static void skshashpath(char *buffer, size_t length,
 158                 const struct skshash *hash, char *basepath)
 159 {
 160         snprintf(buffer, length, "%s/skshash/%02X/%02X/%02X%02X%02X%02X/"
 161                 "%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",
 162                  basepath,
 163                  hash->hash[0], hash->hash[1],
 164                  hash->hash[0], hash->hash[1], hash->hash[2], hash->hash[3],
 165                  hash->hash[4], hash->hash[5], hash->hash[6], hash->hash[7],
 166                  hash->hash[8], hash->hash[9], hash->hash[10], hash->hash[11],
 167                  hash->hash[12], hash->hash[13], hash->hash[14],
 168                  hash->hash[15]);
 169 }
 170
 171 /*****************************************************************************/
 172
 173 /**
 174  *      starttrans - Start a transaction.
 175  */
 176 static bool fs_starttrans(struct onak_dbctx *dbctx)
 177 {
 178         struct onak_fs_dbctx *privctx = (struct onak_fs_dbctx *) dbctx->priv;
 179         struct flock lockstruct;
 180         int remaining = 20;
 181         lockstruct.l_type =
 182             F_RDLCK | ((privctx->lockfile_readonly) ? 0 : F_WRLCK);
 183         lockstruct.l_whence = SEEK_SET;
 184         lockstruct.l_start = 0;
 185         lockstruct.l_len = 1;
 186
 187         while (fcntl(privctx->lockfile_fd, F_SETLK, &lockstruct) == -1) {
 188                 if (remaining-- == 0)
 189                         return false;   /* Hope to hell that noodles DTRT */
 190                 usleep(100);
 191         }
 192         return true;
 193 }
 194
 195 /**
 196  *      endtrans - End a transaction.
 197  */
 198 static void fs_endtrans(struct onak_dbctx *dbctx)
 199 {
 200         struct onak_fs_dbctx *privctx = (struct onak_fs_dbctx *) dbctx->priv;
 201         struct flock lockstruct;
 202
 203         lockstruct.l_type = F_UNLCK;
 204         lockstruct.l_whence = SEEK_SET;
 205         lockstruct.l_start = 0;
 206         lockstruct.l_len = 1;
 207         fcntl(privctx->lockfile_fd, F_SETLK, &lockstruct);
 208 }
 209
 210 static uint64_t fs_getfullkeyid(struct onak_dbctx *dbctx, uint64_t keyid)
 211 {
 212         static char buffer[PATH_MAX];
 213         DIR *d = NULL;
 214         struct dirent *de = NULL;
 215         uint64_t ret = 0;
 216
 217         keydir(buffer, sizeof(buffer), keyid, dbctx->config->location);
 218
 219         d = opendir(buffer);
 220         if (d) {
 221                 do {
 222                         de = readdir(d);
 223                         if (de && de->d_name[0] != '.') {
 224                                 ret = strtoull(de->d_name, NULL, 16);
 225                         }
 226                 } while (de && de->d_name[0] == '.');
 227                 closedir(d);
 228         }
 229
 230         if (ret == 0) {
 231                 subkeydir(buffer, sizeof(buffer), keyid,
 232                         dbctx->config->location);
 233
 234                 d = opendir(buffer);
 235                 if (d) {
 236                         do {
 237                                 de = readdir(d);
 238                                 if (de && de->d_name[0] != '.') {
 239                                         ret = strtoull(de->d_name, NULL, 16);
 240                                 }
 241                         } while (de && de->d_name[0] == '.');
 242                         closedir(d);
 243                 }
 244         }
 245
 246         return ret;
 247 }
 248
 249 /**
 250  *      fetch_key - Given a keyid fetch the key from storage.
 251  *      @keyid: The keyid to fetch.
 252  *      @publickey: A pointer to a structure to return the key in.
 253  *      @intrans: If we're already in a transaction.
 254  */
 255 static int fs_fetch_key_id(struct onak_dbctx *dbctx,
 256               uint64_t keyid,
 257               struct openpgp_publickey **publickey,
 258               bool intrans)
 259 {
 260         static char buffer[PATH_MAX];
 261         int ret = 0, fd;
 262         struct openpgp_packet_list *packets = NULL;
 263
 264         if (!intrans)
 265                 fs_starttrans(dbctx);
 266
 267         if ((keyid >> 32) == 0)
 268                 keyid = fs_getfullkeyid(dbctx, keyid);
 269
 270         keypath(buffer, sizeof(buffer), keyid, dbctx->config->location);
 271         fd = open(buffer, O_RDONLY);
 272         if (fd == -1 && errno == ENOENT) {
 273                 subkeypath(buffer, sizeof(buffer), keyid,
 274                         dbctx->config->location);
 275                 fd = open(buffer, O_RDONLY);
 276         }
 277
 278         if (fd != -1) {
 279                 /* File is present, load it in... */
 280                 read_openpgp_stream(file_fetchchar, &fd, &packets, 0);
 281                 parse_keys(packets, publickey);
 282                 free_packet_list(packets);
 283                 packets = NULL;
 284                 close(fd);
 285                 ret = 1;
 286         }
 287
 288         if (!intrans)
 289                 fs_endtrans(dbctx);
 290         return ret;
 291 }
 292
 293 /**
 294  *      store_key - Takes a key and stores it.
 295  *      @publickey: A pointer to the public key to store.
 296  *      @intrans: If we're already in a transaction.
 297  *      @update: If true the key exists and should be updated.
 298  */
 299 static int fs_store_key(struct onak_dbctx *dbctx,
 300               struct openpgp_publickey *publickey, bool intrans,
 301               bool update)
 302 {
 303         static char buffer[PATH_MAX];
 304         static char wbuffer[PATH_MAX];
 305         int ret = 0, fd;
 306         struct openpgp_packet_list *packets = NULL;
 307         struct openpgp_packet_list *list_end = NULL;
 308         struct openpgp_publickey *next = NULL;
 309         uint64_t keyid;
 310         struct ll *wordlist = NULL, *wl = NULL;
 311         struct skshash hash;
 312         struct openpgp_fingerprint *subkeyids = NULL;
 313         uint32_t hashid;
 314         int i = 0;
 315
 316         if (get_keyid(publickey, &keyid) != ONAK_E_OK) {
 317                 logthing(LOGTHING_ERROR, "Couldn't find key ID for key.");
 318                 return 0;
 319         }
 320
 321         if (!intrans)
 322                 fs_starttrans(dbctx);
 323
 324         prove_path_to(keyid, "key", dbctx->config->location);
 325         keypath(buffer, sizeof(buffer), keyid, dbctx->config->location);
 326
 327         if ((fd =
 328              open(buffer, O_WRONLY | (update ? O_TRUNC : O_CREAT),
 329                   0644)) != -1) {
 330                 next = publickey->next;
 331                 publickey->next = NULL;
 332                 flatten_publickey(publickey, &packets, &list_end);
 333                 publickey->next = next;
 334
 335                 write_openpgp_stream(file_putchar, &fd, packets);
 336                 close(fd);
 337                 free_packet_list(packets);
 338                 packets = NULL;
 339                 ret = 1;
 340         }
 341
 342         if (ret) {
 343                 wl = wordlist = makewordlistfromkey(wordlist, publickey);
 344                 while (wl) {
 345                         uint32_t hash = calchash((uint8_t *) (wl->object));
 346                         prove_path_to(hash, "words", dbctx->config->location);
 347
 348                         worddir(wbuffer, sizeof(wbuffer), wl->object, hash,
 349                                 dbctx->config->location);
 350                         mkdir(wbuffer, 0777);
 351                         wordpath(wbuffer, sizeof(wbuffer), wl->object, hash,
 352                                 keyid, dbctx->config->location);
 353                         link(buffer, wbuffer);
 354
 355                         wl = wl->next;
 356                 }
 357                 llfree(wordlist, free);
 358
 359                 subkeyids = keysubkeys(publickey);
 360                 i = 0;
 361                 while (subkeyids != NULL && subkeyids[i].length != 0) {
 362                         keyid = fingerprint2keyid(&subkeyids[i]);
 363
 364                         prove_path_to(keyid, "subkeys",
 365                                 dbctx->config->location);
 366
 367                         subkeydir(wbuffer, sizeof(wbuffer), keyid,
 368                                 dbctx->config->location);
 369                         mkdir(wbuffer, 0777);
 370                         subkeypath(wbuffer, sizeof(wbuffer), keyid,
 371                                 dbctx->config->location);
 372                         link(buffer, wbuffer);
 373
 374                         i++;
 375                 }
 376                 if (subkeyids != NULL) {
 377                         free(subkeyids);
 378                         subkeyids = NULL;
 379                 }
 380
 381                 get_skshash(publickey, &hash);
 382                 hashid = (hash.hash[0] << 24) + (hash.hash[1] << 16) +
 383                                 (hash.hash[2] << 8) + hash.hash[3];
 384                 prove_path_to(hashid, "skshash", dbctx->config->location);
 385                 skshashpath(wbuffer, sizeof(wbuffer), &hash,
 386                         dbctx->config->location);
 387                 link(buffer, wbuffer);
 388         }
 389
 390         if (!intrans)
 391                 fs_endtrans(dbctx);
 392         return ret;
 393 }
 394
 395 /**
 396  *      delete_key - Given a keyid delete the key from storage.
 397  *      @fp: The fingerprint of the key to delete.
 398  *      @intrans: If we're already in a transaction.
 399  */
 400 static int fs_delete_key(struct onak_dbctx *dbctx,
 401                 struct openpgp_fingerprint *fp, 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         uint64_t keyid;
 412
 413         keyid = fingerprint2keyid(fp);
 414         if (keyid == 0)
 415                 return 1;
 416
 417         if (!intrans)
 418                 fs_starttrans(dbctx);
 419
 420         ret = fs_fetch_key_id(dbctx, keyid, &pk, true);
 421
 422         if (ret) {
 423                 logthing(LOGTHING_DEBUG, "Wordlist for key %016" PRIX64,
 424                          keyid);
 425                 wl = wordlist = makewordlistfromkey(wordlist, pk);
 426                 logthing(LOGTHING_DEBUG,
 427                          "Wordlist for key %016" PRIX64 " done", keyid);
 428                 while (wl) {
 429                         uint32_t hash = calchash((uint8_t *) (wl->object));
 430                         prove_path_to(hash, "words", dbctx->config->location);
 431
 432                         wordpath(buffer, sizeof(buffer), wl->object, hash,
 433                                 keyid, dbctx->config->location);
 434                         unlink(buffer);
 435
 436                         wl = wl->next;
 437                 }
 438
 439                 subkeyids = keysubkeys(pk);
 440                 i = 0;
 441                 while (subkeyids != NULL && subkeyids[i].length != 0) {
 442                         subkeyid = fingerprint2keyid(&subkeyids[i]);
 443                         prove_path_to(subkeyid, "subkeys",
 444                                 dbctx->config->location);
 445
 446                         subkeypath(buffer, sizeof(buffer), subkeyid,
 447                                 dbctx->config->location);
 448                         unlink(buffer);
 449
 450                         i++;
 451                 }
 452                 if (subkeyids != NULL) {
 453                         free(subkeyids);
 454                         subkeyids = NULL;
 455                 }
 456
 457                 get_skshash(pk, &hash);
 458                 skshashpath(buffer, sizeof(buffer), &hash,
 459                         dbctx->config->location);
 460                 unlink(buffer);
 461         }
 462
 463         keypath(buffer, sizeof(buffer), keyid, dbctx->config->location);
 464         unlink(buffer);
 465
 466         if (!intrans)
 467                 fs_endtrans(dbctx);
 468         return 1;
 469 }
 470
 471 static struct ll *internal_get_key_by_word(char *word, struct ll *mct,
 472                 char *basepath)
 473 {
 474         struct ll *keys = NULL;
 475         DIR *d = NULL;
 476         char buffer[PATH_MAX];
 477         uint32_t hash = calchash((uint8_t *) (word));
 478         struct dirent *de;
 479
 480         worddir(buffer, sizeof(buffer), word, hash, basepath);
 481         d = opendir(buffer);
 482         logthing(LOGTHING_DEBUG, "Scanning for word %s in dir %s", word,
 483                  buffer);
 484         if (d) {
 485                 do {
 486                         de = readdir(d);
 487                         if (de && de->d_name[0] != '.') {
 488                                 if ((!mct)
 489                                     || (llfind(mct, de->d_name,
 490                                         (int (*)(const void *, const void *))
 491                                                     strcmp) !=
 492                                         NULL)) {
 493                                         logthing(LOGTHING_DEBUG,
 494                                                  "Found %s // %s", word,
 495                                                  de->d_name);
 496                                         keys =
 497                                             lladd(keys,
 498                                                   strdup(de->d_name));
 499                                 }
 500                         }
 501                 } while (de);
 502                 closedir(d);
 503         }
 504
 505         return keys;
 506 }
 507
 508 /*
 509  *      fetch_key_text - Trys to find the keys that contain the supplied text.
 510  *      @search: The text to search for.
 511  *      @publickey: A pointer to a structure to return the key in.
 512  */
 513 static int fs_fetch_key_text(struct onak_dbctx *dbctx,
 514                    const char *search,
 515                    struct openpgp_publickey **publickey)
 516 {
 517         struct ll *wordlist = NULL, *wl = NULL;
 518         struct ll *keylist = NULL;
 519         char      *searchtext = NULL;
 520         int addedkeys = 0;
 521
 522         logthing(LOGTHING_DEBUG, "Search was '%s'", search);
 523
 524         searchtext = strdup(search);
 525         wl = wordlist = makewordlist(wordlist, searchtext);
 526
 527         keylist = internal_get_key_by_word(wordlist->object, NULL,
 528                 dbctx->config->location);
 529
 530         if (!keylist) {
 531                 llfree(wordlist, NULL);
 532                 free(searchtext);
 533                 searchtext = NULL;
 534                 return 0;
 535         }
 536
 537         wl = wl->next;
 538         while (wl) {
 539                 struct ll *nkl =
 540                     internal_get_key_by_word(wl->object, keylist,
 541                         dbctx->config->location);
 542                 if (!nkl) {
 543                         llfree(wordlist, NULL);
 544                         llfree(keylist, free);
 545                         free(searchtext);
 546                         searchtext = NULL;
 547                         return 0;
 548                 }
 549                 llfree(keylist, free);
 550                 keylist = nkl;
 551                 wl = wl->next;
 552         }
 553
 554         llfree(wordlist, NULL);
 555
 556         /* Now add the keys... */
 557         wl = keylist;
 558         while (wl) {
 559                 logthing(LOGTHING_DEBUG, "Adding key: %s", wl->object);
 560                 addedkeys +=
 561                     fs_fetch_key_id(dbctx,
 562                               strtoull(wl->object, NULL, 16), publickey,
 563                               false);
 564                 if (addedkeys >= config.maxkeys)
 565                         break;
 566                 wl = wl->next;
 567         }
 568
 569         llfree(keylist, free);
 570         free(searchtext);
 571         searchtext = NULL;
 572
 573         return addedkeys;
 574 }
 575
 576 /**
 577  *      fetch_key_skshash - Given an SKS hash fetch the key from storage.
 578  *      @hash: The hash to fetch.
 579  *      @publickey: A pointer to a structure to return the key in.
 580  *      @intrans: If we're already in a transaction.
 581  */
 582 static int fs_fetch_key_skshash(struct onak_dbctx *dbctx,
 583               const struct skshash *hash,
 584               struct openpgp_publickey **publickey)
 585 {
 586         static char buffer[PATH_MAX];
 587         int ret = 0, fd;
 588         struct openpgp_packet_list *packets = NULL;
 589
 590         skshashpath(buffer, sizeof(buffer), hash, dbctx->config->location);
 591         if ((fd = open(buffer, O_RDONLY)) != -1) {
 592                 read_openpgp_stream(file_fetchchar, &fd, &packets, 0);
 593                 parse_keys(packets, publickey);
 594                 free_packet_list(packets);
 595                 packets = NULL;
 596                 close(fd);
 597                 ret = 1;
 598         }
 599
 600         return ret;
 601 }
 602
 603 /**
 604  *      iterate_keys - call a function once for each key in the db.
 605  *      @iterfunc: The function to call.
 606  *      @ctx: A context pointer
 607  *
 608  *      Calls iterfunc once for each key in the database. ctx is passed
 609  *      unaltered to iterfunc. This function is intended to aid database dumps
 610  *      and statistic calculations.
 611  *
 612  *      Returns the number of keys we iterated over.
 613  */
 614 static int fs_iterate_keys(struct onak_dbctx *dbctx,
 615                 void (*iterfunc)(void *ctx,
 616                 struct openpgp_publickey *key), void *ctx)
 617 {
 618         return 0;
 619 }
 620
 621 /*
 622  * Include the basic keydb routines.
 623  */
 624 #define NEED_KEYID2UID 1
 625 #define NEED_GETKEYSIGS 1
 626 #define NEED_UPDATEKEYS 1
 627 #define NEED_GET_FP 1
 628 #include "keydb.c"
 629
 630 /**
 631  *      cleanupdb - De-initialize the key database.
 632  */
 633 static void fs_cleanupdb(struct onak_dbctx *dbctx)
 634 {
 635         struct onak_fs_dbctx *privctx = (struct onak_fs_dbctx *) dbctx->priv;
 636
 637         /* Mmmm nothing to do here? */
 638         close(privctx->lockfile_fd);
 639
 640         free(privctx);
 641         dbctx->priv = NULL;
 642         free(dbctx);
 643 }
 644
 645 /**
 646  *      initdb - Initialize the key database.
 647  */
 648 struct onak_dbctx *keydb_fs_init(struct onak_db_config *dbcfg, bool readonly)
 649 {
 650         char buffer[PATH_MAX];
 651         struct onak_dbctx *dbctx;
 652         struct onak_fs_dbctx *privctx;
 653
 654         dbctx = malloc(sizeof(struct onak_dbctx));
 655         if (dbctx == NULL) {
 656                 return NULL;
 657         }
 658         dbctx->config = dbcfg;
 659         dbctx->priv = privctx = malloc(sizeof(*privctx));
 660         if (privctx == NULL) {
 661                 free(dbctx);
 662                 return NULL;
 663         }
 664
 665         privctx->lockfile_readonly = readonly;
 666
 667         snprintf(buffer, sizeof(buffer), "%s/.lock", dbcfg->location);
 668
 669         if (access(dbcfg->location, R_OK | W_OK | X_OK) == -1) {
 670                 if (errno != ENOENT) {
 671                         logthing(LOGTHING_CRITICAL,
 672                                  "Unable to access keydb_fs root of '%s'. (%s)",
 673                                  dbcfg->location, strerror(errno));
 674                         exit(1);        /* Lacking rwx on the key dir */
 675                 }
 676                 mkdir(dbcfg->location, 0777);
 677                 privctx->lockfile_fd = open(buffer, O_RDWR | O_CREAT, 0600);
 678         }
 679         if (chdir(dbcfg->location) == -1) {
 680                 /* Shouldn't happen after the above */
 681                 logthing(LOGTHING_CRITICAL,
 682                         "Couldn't change to database directory: %s",
 683                         strerror(errno));
 684                 free(dbctx->priv);
 685                 free(dbctx);
 686                 return NULL;
 687         }
 688         privctx->lockfile_fd = open(buffer,
 689                                  (privctx->lockfile_readonly) ?
 690                                  O_RDONLY : O_RDWR);
 691         if (privctx->lockfile_fd == -1)
 692                 privctx->lockfile_fd = open(buffer, O_RDWR | O_CREAT, 0600);
 693         if (privctx->lockfile_fd == -1) {
 694                 logthing(LOGTHING_CRITICAL,
 695                          "Unable to open lockfile '%s'. (%s)",
 696                          buffer, strerror(errno));
 697                 exit(1);        /* Lacking rwx on the key dir */
 698         }
 699
 700         dbctx->cleanupdb                = fs_cleanupdb;
 701         dbctx->starttrans               = fs_starttrans;
 702         dbctx->endtrans                 = fs_endtrans;
 703         dbctx->fetch_key_id             = fs_fetch_key_id;
 704         dbctx->fetch_key_fp             = generic_fetch_key_fp;
 705         dbctx->fetch_key_text           = fs_fetch_key_text;
 706         dbctx->fetch_key_skshash        = fs_fetch_key_skshash;
 707         dbctx->store_key                = fs_store_key;
 708         dbctx->update_keys              = generic_update_keys;
 709         dbctx->delete_key               = fs_delete_key;
 710         dbctx->getkeysigs               = generic_getkeysigs;
 711         dbctx->cached_getkeysigs        = generic_cached_getkeysigs;
 712         dbctx->keyid2uid                = generic_keyid2uid;
 713         dbctx->iterate_keys             = fs_iterate_keys;
 714
 715         return dbctx;
 716 }