keyd.c

   1 /*
   2  * keyd.c - key retrieval daemon
   3  *
   4  * Copyright 2004,2011 Jonathan McDowell <noodles@earth.li>
   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 <errno.h>
  21 #include <fcntl.h>
  22 #include <getopt.h>
  23 #include <signal.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <sys/select.h>
  28 #include <sys/socket.h>
  29 #include <sys/types.h>
  30 #include <sys/un.h>
  31 #include <time.h>
  32 #include <unistd.h>
  33
  34 #include "charfuncs.h"
  35 #include "cleanup.h"
  36 #include "keyd.h"
  37 #include "keydb.h"
  38 #include "keyid.h"
  39 #include "keystructs.h"
  40 #include "log.h"
  41 #include "mem.h"
  42 #include "onak-conf.h"
  43 #include "parsekey.h"
  44 #include "version.h"
  45
  46 static struct keyd_stats *stats;
  47
  48 void daemonize(void)
  49 {
  50         pid_t pid;
  51
  52         pid = fork();
  53
  54         if (pid < 0) {
  55                 logthing(LOGTHING_CRITICAL,
  56                         "Failed to fork into background: %d (%s)",
  57                         errno,
  58                         strerror(errno));
  59                 exit(EXIT_FAILURE);
  60         } else if (pid > 0) {
  61                 logthing(LOGTHING_INFO, "Backgrounded as pid %d.", pid);
  62                 exit(EXIT_SUCCESS);
  63         }
  64
  65         pid = setsid();
  66
  67         freopen("/dev/null", "r", stdin);
  68         freopen("/dev/null", "w", stdout);
  69         freopen("/dev/null", "w", stderr);
  70
  71         return;
  72 }
  73
  74 void iteratefunc(void *ctx, struct openpgp_publickey *key)
  75 {
  76         struct openpgp_packet_list *packets = NULL;
  77         struct openpgp_packet_list *list_end = NULL;
  78         struct buffer_ctx           storebuf;
  79         int                         ret = 0;
  80         int                         *fd = (int *) ctx;
  81
  82         if (key != NULL) {
  83                 storebuf.offset = 0;
  84                 storebuf.size = 8192;
  85                 storebuf.buffer = malloc(8192);
  86
  87                 logthing(LOGTHING_TRACE,
  88                                 "Iterating over 0x%016" PRIX64 ".",
  89                                 get_keyid(key));
  90
  91                 flatten_publickey(key,
  92                                 &packets,
  93                                 &list_end);
  94                 write_openpgp_stream(buffer_putchar,
  95                                 &storebuf,
  96                                 packets);
  97                 logthing(LOGTHING_TRACE,
  98                                 "Sending %d bytes.",
  99                                 storebuf.offset);
 100                 ret = write(*fd, &storebuf.offset,
 101                         sizeof(storebuf.offset));
 102                 if (ret != 0) {
 103                         write(*fd, storebuf.buffer,
 104                                 storebuf.offset);
 105                 }
 106
 107                 free(storebuf.buffer);
 108                 storebuf.buffer = NULL;
 109                 storebuf.size = storebuf.offset = 0;
 110                 free_packet_list(packets);
 111                 packets = list_end = NULL;
 112         }
 113
 114         return;
 115 }
 116
 117 int sock_init(const char *sockname)
 118 {
 119         struct sockaddr_un sock;
 120         int                fd = -1;
 121         int                ret = -1;
 122
 123         fd = socket(PF_UNIX, SOCK_STREAM, 0);
 124         if (fd != -1) {
 125                 ret = fcntl(fd, F_SETFD, 1);
 126         }
 127
 128         if (ret != -1) {
 129                 sock.sun_family = AF_UNIX;
 130                 strncpy(sock.sun_path, sockname, sizeof(sock.sun_path) - 1);
 131                 unlink(sockname);
 132                 ret = bind(fd, (struct sockaddr *) &sock, sizeof(sock));
 133         }
 134
 135         if (ret != -1) {
 136                 ret = listen(fd, 5);
 137         }
 138
 139         return fd;
 140 }
 141
 142 int sock_do(int fd)
 143 {
 144         uint32_t cmd = KEYD_CMD_UNKNOWN;
 145         ssize_t  bytes = 0;
 146         ssize_t  count = 0;
 147         int      ret = 0;
 148         uint64_t keyid = 0;
 149         char     *search = NULL;
 150         struct openpgp_publickey *key = NULL;
 151         struct openpgp_packet_list *packets = NULL;
 152         struct openpgp_packet_list *list_end = NULL;
 153         struct buffer_ctx storebuf;
 154         struct skshash hash;
 155
 156         /*
 157          * Get the command from the client.
 158          */
 159         bytes = read(fd, &cmd, sizeof(cmd));
 160
 161         logthing(LOGTHING_DEBUG, "Read %d bytes, command: %d", bytes, cmd);
 162
 163         if (bytes != sizeof(cmd)) {
 164                 ret = 1;
 165         }
 166
 167         if (ret == 0) {
 168                 if (cmd < KEYD_CMD_LAST) {
 169                         stats->command_stats[cmd]++;
 170                 } else {
 171                         stats->command_stats[KEYD_CMD_UNKNOWN]++;
 172                 }
 173                 switch (cmd) {
 174                 case KEYD_CMD_VERSION:
 175                         cmd = KEYD_REPLY_OK;
 176                         write(fd, &cmd, sizeof(cmd));
 177                         cmd = sizeof(keyd_version);
 178                         write(fd, &cmd, sizeof(cmd));
 179                         write(fd, &keyd_version, sizeof(keyd_version));
 180                         break;
 181                 case KEYD_CMD_GET:
 182                         cmd = KEYD_REPLY_OK;
 183                         write(fd, &cmd, sizeof(cmd));
 184                         bytes = read(fd, &keyid, sizeof(keyid));
 185                         if (bytes != sizeof(keyid)) {
 186                                 ret = 1;
 187                         }
 188                         storebuf.offset = 0;
 189                         if (ret == 0) {
 190                                 logthing(LOGTHING_INFO,
 191                                                 "Fetching 0x%" PRIX64
 192                                                 ", result: %d",
 193                                                 keyid,
 194                                                 config.dbbackend->
 195                                                 fetch_key(keyid, &key, false));
 196                                 if (key != NULL) {
 197                                         storebuf.size = 8192;
 198                                         storebuf.buffer = malloc(8192);
 199
 200                                         flatten_publickey(key,
 201                                                         &packets,
 202                                                         &list_end);
 203                                         write_openpgp_stream(buffer_putchar,
 204                                                         &storebuf,
 205                                                         packets);
 206                                         logthing(LOGTHING_TRACE,
 207                                                         "Sending %d bytes.",
 208                                                         storebuf.offset);
 209                                         write(fd, &storebuf.offset,
 210                                                 sizeof(storebuf.offset));
 211                                         write(fd, storebuf.buffer,
 212                                                 storebuf.offset);
 213
 214                                         free(storebuf.buffer);
 215                                         storebuf.buffer = NULL;
 216                                         storebuf.size = storebuf.offset = 0;
 217                                         free_packet_list(packets);
 218                                         packets = list_end = NULL;
 219                                         free_publickey(key);
 220                                         key = NULL;
 221                                 } else {
 222                                         write(fd, &storebuf.offset,
 223                                                 sizeof(storebuf.offset));
 224                                 }
 225                         }
 226                         break;
 227                 case KEYD_CMD_GETTEXT:
 228                         cmd = KEYD_REPLY_OK;
 229                         write(fd, &cmd, sizeof(cmd));
 230                         bytes = read(fd, &count, sizeof(count));
 231                         if (bytes != sizeof(count)) {
 232                                 ret = 1;
 233                         }
 234                         storebuf.offset = 0;
 235                         if (ret == 0) {
 236                                 search = malloc(count+1);
 237                                 read(fd, search, count);
 238                                 search[count] = 0;
 239                                 logthing(LOGTHING_INFO,
 240                                                 "Fetching %s, result: %d",
 241                                                 search,
 242                                                 config.dbbackend->
 243                                                 fetch_key_text(search, &key));
 244                                 if (key != NULL) {
 245                                         storebuf.size = 8192;
 246                                         storebuf.buffer = malloc(8192);
 247
 248                                         flatten_publickey(key,
 249                                                         &packets,
 250                                                         &list_end);
 251                                         write_openpgp_stream(buffer_putchar,
 252                                                         &storebuf,
 253                                                         packets);
 254                                         logthing(LOGTHING_TRACE,
 255                                                         "Sending %d bytes.",
 256                                                         storebuf.offset);
 257                                         write(fd, &storebuf.offset,
 258                                                 sizeof(storebuf.offset));
 259                                         write(fd, storebuf.buffer,
 260                                                 storebuf.offset);
 261
 262                                         free(storebuf.buffer);
 263                                         storebuf.buffer = NULL;
 264                                         storebuf.size = storebuf.offset = 0;
 265                                         free_packet_list(packets);
 266                                         packets = list_end = NULL;
 267                                         free_publickey(key);
 268                                         key = NULL;
 269                                 } else {
 270                                         write(fd, &storebuf.offset,
 271                                                 sizeof(storebuf.offset));
 272                                 }
 273                         }
 274                         break;
 275                 case KEYD_CMD_STORE:
 276                         cmd = KEYD_REPLY_OK;
 277                         write(fd, &cmd, sizeof(cmd));
 278                         storebuf.offset = 0;
 279                         bytes = read(fd, &storebuf.size,
 280                                         sizeof(storebuf.size));
 281                         logthing(LOGTHING_TRACE, "Reading %d bytes.",
 282                                         storebuf.size);
 283                         if (bytes != sizeof(storebuf.size)) {
 284                                 ret = 1;
 285                         }
 286                         if (ret == 0 && storebuf.size > 0) {
 287                                 storebuf.buffer = malloc(storebuf.size);
 288                                 bytes = count = 0;
 289                                 while (bytes >= 0 && count < storebuf.size) {
 290                                         bytes = read(fd,
 291                                                 &storebuf.buffer[count],
 292                                                 storebuf.size - count);
 293                                         logthing(LOGTHING_TRACE,
 294                                                         "Read %d bytes.",
 295                                                         bytes);
 296                                         count += bytes;
 297                                 }
 298                                 read_openpgp_stream(buffer_fetchchar,
 299                                                 &storebuf,
 300                                                 &packets,
 301                                                 0);
 302                                 parse_keys(packets, &key);
 303                                 config.dbbackend->store_key(key, false, false);
 304                                 free_packet_list(packets);
 305                                 packets = NULL;
 306                                 free_publickey(key);
 307                                 key = NULL;
 308                                 free(storebuf.buffer);
 309                                 storebuf.buffer = NULL;
 310                                 storebuf.size = storebuf.offset = 0;
 311                         }
 312                         break;
 313                 case KEYD_CMD_DELETE:
 314                         cmd = KEYD_REPLY_OK;
 315                         write(fd, &cmd, sizeof(cmd));
 316                         bytes = read(fd, &keyid, sizeof(keyid));
 317                         if (bytes != sizeof(keyid)) {
 318                                 ret = 1;
 319                         }
 320                         if (ret == 0) {
 321                                 logthing(LOGTHING_INFO,
 322                                                 "Deleting 0x%" PRIX64
 323                                                 ", result: %d",
 324                                                 keyid,
 325                                                 config.dbbackend->delete_key(
 326                                                         keyid, false));
 327                         }
 328                         break;
 329                 case KEYD_CMD_GETFULLKEYID:
 330                         cmd = KEYD_REPLY_OK;
 331                         write(fd, &cmd, sizeof(cmd));
 332                         bytes = read(fd, &keyid, sizeof(keyid));
 333                         if (bytes != sizeof(keyid)) {
 334                                 ret = 1;
 335                         }
 336                         if (ret == 0) {
 337                                 keyid = config.dbbackend->getfullkeyid(keyid);
 338                                 cmd = sizeof(keyid);
 339                                 write(fd, &cmd, sizeof(cmd));
 340                                 write(fd, &keyid, sizeof(keyid));
 341                         }
 342                         break;
 343                 case KEYD_CMD_KEYITER:
 344                         cmd = KEYD_REPLY_OK;
 345                         write(fd, &cmd, sizeof(cmd));
 346                         config.dbbackend->iterate_keys(iteratefunc,
 347                                         &fd);
 348                         bytes = 0;
 349                         write(fd, &bytes, sizeof(bytes));
 350                         break;
 351                 case KEYD_CMD_CLOSE:
 352                         cmd = KEYD_REPLY_OK;
 353                         write(fd, &cmd, sizeof(cmd));
 354                         ret = 1;
 355                         break;
 356                 case KEYD_CMD_QUIT:
 357                         cmd = KEYD_REPLY_OK;
 358                         write(fd, &cmd, sizeof(cmd));
 359                         logthing(LOGTHING_NOTICE,
 360                                 "Exiting due to quit request.");
 361                         ret = 1;
 362                         trytocleanup();
 363                         break;
 364                 case KEYD_CMD_STATS:
 365                         cmd = KEYD_REPLY_OK;
 366                         write(fd, &cmd, sizeof(cmd));
 367                         cmd = sizeof(*stats);
 368                         write(fd, &cmd, sizeof(cmd));
 369                         write(fd, stats,
 370                                 sizeof(*stats));
 371                         break;
 372                 case KEYD_CMD_GETSKSHASH:
 373                         cmd = KEYD_REPLY_OK;
 374                         write(fd, &cmd, sizeof(cmd));
 375                         bytes = read(fd, hash.hash, sizeof(hash.hash));
 376                         if (bytes != sizeof(hash.hash)) {
 377                                 ret = 1;
 378                         }
 379                         storebuf.offset = 0;
 380                         if (ret == 0) {
 381                                 logthing(LOGTHING_INFO,
 382                                                 "Fetching by hash"
 383                                                 ", result: %d",
 384                                                 config.dbbackend->
 385                                                 fetch_key_skshash(&hash,
 386                                                         &key));
 387                                 if (key != NULL) {
 388                                         storebuf.size = 8192;
 389                                         storebuf.buffer = malloc(8192);
 390
 391                                         flatten_publickey(key,
 392                                                         &packets,
 393                                                         &list_end);
 394                                         write_openpgp_stream(buffer_putchar,
 395                                                         &storebuf,
 396                                                         packets);
 397                                         logthing(LOGTHING_TRACE,
 398                                                         "Sending %d bytes.",
 399                                                         storebuf.offset);
 400                                         write(fd, &storebuf.offset,
 401                                                 sizeof(storebuf.offset));
 402                                         write(fd, storebuf.buffer,
 403                                                 storebuf.offset);
 404
 405                                         free(storebuf.buffer);
 406                                         storebuf.buffer = NULL;
 407                                         storebuf.size = storebuf.offset = 0;
 408                                         free_packet_list(packets);
 409                                         packets = list_end = NULL;
 410                                         free_publickey(key);
 411                                         key = NULL;
 412                                 } else {
 413                                         write(fd, &storebuf.offset,
 414                                                 sizeof(storebuf.offset));
 415                                 }
 416                         }
 417                         break;
 418
 419                 default:
 420                         logthing(LOGTHING_ERROR, "Got unknown command: %d",
 421                                         cmd);
 422                         cmd = KEYD_REPLY_UNKNOWN_CMD;
 423                         write(fd, &cmd, sizeof(cmd));
 424                 }
 425         }
 426
 427         return(ret);
 428 }
 429
 430 int sock_close(int fd)
 431 {
 432         shutdown(fd, SHUT_RDWR);
 433         return close(fd);
 434 }
 435
 436 int sock_accept(int fd)
 437 {
 438         struct sockaddr_un sock;
 439         socklen_t          socklen;
 440         int    srv = -1;
 441         int    ret = -1;
 442
 443         socklen = sizeof(sock);
 444         srv = accept(fd, (struct sockaddr *) &sock, &socklen);
 445         if (srv != -1) {
 446                 ret = fcntl(srv, F_SETFD, 1);
 447         }
 448
 449         if (ret != -1) {
 450                 stats->connects++;
 451                 while (!sock_do(srv)) ;
 452                 sock_close(srv);
 453         }
 454
 455         return 1;
 456 }
 457
 458 static void usage(void)
 459 {
 460         puts("keyd " ONAK_VERSION " - backend key serving daemon for the "
 461                 "onak PGP keyserver.\n");
 462         puts("Usage:\n");
 463         puts("\tkeyd [options]\n");
 464         puts("\tOptions:\n:");
 465         puts("-c <file> - use <file> as the config file");
 466         puts("-f        - run in the foreground");
 467         puts("-h        - show this help text");
 468         exit(EXIT_FAILURE);
 469 }
 470
 471 int main(int argc, char *argv[])
 472 {
 473         int fd = -1;
 474         fd_set rfds;
 475         char sockname[1024];
 476         char *configfile = NULL;
 477         bool foreground = false;
 478         int optchar;
 479
 480         while ((optchar = getopt(argc, argv, "c:fh")) != -1 ) {
 481                 switch (optchar) {
 482                 case 'c':
 483                         configfile = strdup(optarg);
 484                         break;
 485                 case 'f':
 486                         foreground = true;
 487                         break;
 488                 case 'h':
 489                 default:
 490                         usage();
 491                         break;
 492                 }
 493         }
 494
 495         readconfig(configfile);
 496         free(configfile);
 497         configfile = NULL;
 498         initlogthing("keyd", config.logfile);
 499         config.use_keyd = false;
 500
 501         if (!foreground) {
 502                 daemonize();
 503         }
 504
 505         catchsignals();
 506         signal(SIGPIPE, SIG_IGN);
 507
 508
 509         stats = calloc(1, sizeof(*stats));
 510         if (!stats) {
 511                 logthing(LOGTHING_ERROR,
 512                         "Couldn't allocate memory for stats structure.");
 513                 exit(EXIT_FAILURE);
 514         }
 515         stats->started = time(NULL);
 516
 517         snprintf(sockname, 1023, "%s/%s", config.db_dir, KEYD_SOCKET);
 518         fd = sock_init(sockname);
 519
 520         if (fd != -1) {
 521                 FD_ZERO(&rfds);
 522                 FD_SET(fd, &rfds);
 523
 524                 config.dbbackend->initdb(false);
 525
 526                 logthing(LOGTHING_NOTICE, "Accepting connections.");
 527                 while (!cleanup() && select(fd + 1, &rfds, NULL, NULL, NULL) != -1) {
 528                         logthing(LOGTHING_INFO, "Accepted connection.");
 529                         sock_accept(fd);
 530                         FD_SET(fd, &rfds);
 531                 }
 532                 config.dbbackend->cleanupdb();
 533                 sock_close(fd);
 534                 unlink(sockname);
 535         }
 536
 537         free(stats);
 538
 539         cleanuplogthing();
 540         cleanupconfig();
 541
 542         return(EXIT_SUCCESS);
 543 }