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 /* Maximum number of clients we're prepared to accept at once */
  47 #define MAX_CLIENTS 16
  48
  49 static struct keyd_stats *stats;
  50
  51 void daemonize(void)
  52 {
  53         pid_t pid;
  54
  55         pid = fork();
  56
  57         if (pid < 0) {
  58                 logthing(LOGTHING_CRITICAL,
  59                         "Failed to fork into background: %d (%s)",
  60                         errno,
  61                         strerror(errno));
  62                 exit(EXIT_FAILURE);
  63         } else if (pid > 0) {
  64                 logthing(LOGTHING_INFO, "Backgrounded as pid %d.", pid);
  65                 exit(EXIT_SUCCESS);
  66         }
  67
  68         pid = setsid();
  69
  70         freopen("/dev/null", "r", stdin);
  71         freopen("/dev/null", "w", stdout);
  72         freopen("/dev/null", "w", stderr);
  73
  74         return;
  75 }
  76
  77 void iteratefunc(void *ctx, struct openpgp_publickey *key)
  78 {
  79         struct openpgp_packet_list *packets = NULL;
  80         struct openpgp_packet_list *list_end = NULL;
  81         struct buffer_ctx           storebuf;
  82         int                         ret = 0;
  83         int                         *fd = (int *) ctx;
  84         uint64_t                    keyid;
  85
  86         if (key != NULL) {
  87                 storebuf.offset = 0;
  88                 storebuf.size = 8192;
  89                 storebuf.buffer = malloc(8192);
  90
  91                 get_keyid(key, &keyid);
  92                 logthing(LOGTHING_TRACE,
  93                                 "Iterating over 0x%016" PRIX64 ".",
  94                                 keyid);
  95
  96                 flatten_publickey(key,
  97                                 &packets,
  98                                 &list_end);
  99                 write_openpgp_stream(buffer_putchar,
 100                                 &storebuf,
 101                                 packets);
 102                 logthing(LOGTHING_TRACE,
 103                                 "Sending %d bytes.",
 104                                 storebuf.offset);
 105                 ret = write(*fd, &storebuf.offset,
 106                         sizeof(storebuf.offset));
 107                 if (ret != 0) {
 108                         write(*fd, storebuf.buffer,
 109                                 storebuf.offset);
 110                 }
 111
 112                 free(storebuf.buffer);
 113                 storebuf.buffer = NULL;
 114                 storebuf.size = storebuf.offset = 0;
 115                 free_packet_list(packets);
 116                 packets = list_end = NULL;
 117         }
 118
 119         return;
 120 }
 121
 122 int sock_init(const char *sockname)
 123 {
 124         struct sockaddr_un sock;
 125         int                fd = -1;
 126         int                ret = -1;
 127
 128         fd = socket(PF_UNIX, SOCK_STREAM, 0);
 129         if (fd != -1) {
 130                 ret = fcntl(fd, F_SETFD, FD_CLOEXEC);
 131         }
 132
 133         if (ret != -1) {
 134                 sock.sun_family = AF_UNIX;
 135                 strncpy(sock.sun_path, sockname, sizeof(sock.sun_path) - 1);
 136                 unlink(sockname);
 137                 ret = bind(fd, (struct sockaddr *) &sock, sizeof(sock));
 138         }
 139
 140         if (ret != -1) {
 141                 ret = listen(fd, 5);
 142         }
 143
 144         return fd;
 145 }
 146
 147 int sock_do(int fd)
 148 {
 149         uint32_t cmd = KEYD_CMD_UNKNOWN;
 150         ssize_t  bytes = 0;
 151         ssize_t  count = 0;
 152         int      ret = 0;
 153         uint64_t keyid = 0;
 154         char     *search = NULL;
 155         struct openpgp_publickey *key = NULL;
 156         struct openpgp_packet_list *packets = NULL;
 157         struct openpgp_packet_list *list_end = NULL;
 158         struct buffer_ctx storebuf;
 159         struct skshash hash;
 160
 161         /*
 162          * Get the command from the client.
 163          */
 164         bytes = read(fd, &cmd, sizeof(cmd));
 165
 166         logthing(LOGTHING_DEBUG, "Read %d bytes, command: %d", bytes, cmd);
 167
 168         if (bytes != sizeof(cmd)) {
 169                 ret = 1;
 170         }
 171
 172         if (ret == 0) {
 173                 if (cmd < KEYD_CMD_LAST) {
 174                         stats->command_stats[cmd]++;
 175                 } else {
 176                         stats->command_stats[KEYD_CMD_UNKNOWN]++;
 177                 }
 178                 switch (cmd) {
 179                 case KEYD_CMD_VERSION:
 180                         cmd = KEYD_REPLY_OK;
 181                         write(fd, &cmd, sizeof(cmd));
 182                         cmd = sizeof(keyd_version);
 183                         write(fd, &cmd, sizeof(cmd));
 184                         write(fd, &keyd_version, sizeof(keyd_version));
 185                         break;
 186                 case KEYD_CMD_GET:
 187                         cmd = KEYD_REPLY_OK;
 188                         write(fd, &cmd, sizeof(cmd));
 189                         bytes = read(fd, &keyid, sizeof(keyid));
 190                         if (bytes != sizeof(keyid)) {
 191                                 ret = 1;
 192                         }
 193                         storebuf.offset = 0;
 194                         if (ret == 0) {
 195                                 logthing(LOGTHING_INFO,
 196                                                 "Fetching 0x%" PRIX64
 197                                                 ", result: %d",
 198                                                 keyid,
 199                                                 config.dbbackend->
 200                                                 fetch_key(keyid, &key, false));
 201                                 if (key != NULL) {
 202                                         storebuf.size = 8192;
 203                                         storebuf.buffer = malloc(8192);
 204
 205                                         flatten_publickey(key,
 206                                                         &packets,
 207                                                         &list_end);
 208                                         write_openpgp_stream(buffer_putchar,
 209                                                         &storebuf,
 210                                                         packets);
 211                                         logthing(LOGTHING_TRACE,
 212                                                         "Sending %d bytes.",
 213                                                         storebuf.offset);
 214                                         write(fd, &storebuf.offset,
 215                                                 sizeof(storebuf.offset));
 216                                         write(fd, storebuf.buffer,
 217                                                 storebuf.offset);
 218
 219                                         free(storebuf.buffer);
 220                                         storebuf.buffer = NULL;
 221                                         storebuf.size = storebuf.offset = 0;
 222                                         free_packet_list(packets);
 223                                         packets = list_end = NULL;
 224                                         free_publickey(key);
 225                                         key = NULL;
 226                                 } else {
 227                                         write(fd, &storebuf.offset,
 228                                                 sizeof(storebuf.offset));
 229                                 }
 230                         }
 231                         break;
 232                 case KEYD_CMD_GETTEXT:
 233                         cmd = KEYD_REPLY_OK;
 234                         write(fd, &cmd, sizeof(cmd));
 235                         bytes = read(fd, &count, sizeof(count));
 236                         if (bytes != sizeof(count)) {
 237                                 ret = 1;
 238                         }
 239                         storebuf.offset = 0;
 240                         if (ret == 0) {
 241                                 search = malloc(count+1);
 242                                 read(fd, search, count);
 243                                 search[count] = 0;
 244                                 logthing(LOGTHING_INFO,
 245                                                 "Fetching %s, result: %d",
 246                                                 search,
 247                                                 config.dbbackend->
 248                                                 fetch_key_text(search, &key));
 249                                 if (key != NULL) {
 250                                         storebuf.size = 8192;
 251                                         storebuf.buffer = malloc(8192);
 252
 253                                         flatten_publickey(key,
 254                                                         &packets,
 255                                                         &list_end);
 256                                         write_openpgp_stream(buffer_putchar,
 257                                                         &storebuf,
 258                                                         packets);
 259                                         logthing(LOGTHING_TRACE,
 260                                                         "Sending %d bytes.",
 261                                                         storebuf.offset);
 262                                         write(fd, &storebuf.offset,
 263                                                 sizeof(storebuf.offset));
 264                                         write(fd, storebuf.buffer,
 265                                                 storebuf.offset);
 266
 267                                         free(storebuf.buffer);
 268                                         storebuf.buffer = NULL;
 269                                         storebuf.size = storebuf.offset = 0;
 270                                         free_packet_list(packets);
 271                                         packets = list_end = NULL;
 272                                         free_publickey(key);
 273                                         key = NULL;
 274                                 } else {
 275                                         write(fd, &storebuf.offset,
 276                                                 sizeof(storebuf.offset));
 277                                 }
 278                         }
 279                         break;
 280                 case KEYD_CMD_STORE:
 281                         cmd = KEYD_REPLY_OK;
 282                         write(fd, &cmd, sizeof(cmd));
 283                         storebuf.offset = 0;
 284                         bytes = read(fd, &storebuf.size,
 285                                         sizeof(storebuf.size));
 286                         logthing(LOGTHING_TRACE, "Reading %d bytes.",
 287                                         storebuf.size);
 288                         if (bytes != sizeof(storebuf.size)) {
 289                                 ret = 1;
 290                         }
 291                         if (ret == 0 && storebuf.size > 0) {
 292                                 storebuf.buffer = malloc(storebuf.size);
 293                                 bytes = count = 0;
 294                                 while (bytes >= 0 && count < storebuf.size) {
 295                                         bytes = read(fd,
 296                                                 &storebuf.buffer[count],
 297                                                 storebuf.size - count);
 298                                         logthing(LOGTHING_TRACE,
 299                                                         "Read %d bytes.",
 300                                                         bytes);
 301                                         count += bytes;
 302                                 }
 303                                 read_openpgp_stream(buffer_fetchchar,
 304                                                 &storebuf,
 305                                                 &packets,
 306                                                 0);
 307                                 parse_keys(packets, &key);
 308                                 config.dbbackend->store_key(key, false, false);
 309                                 free_packet_list(packets);
 310                                 packets = NULL;
 311                                 free_publickey(key);
 312                                 key = NULL;
 313                                 free(storebuf.buffer);
 314                                 storebuf.buffer = NULL;
 315                                 storebuf.size = storebuf.offset = 0;
 316                         }
 317                         break;
 318                 case KEYD_CMD_DELETE:
 319                         cmd = KEYD_REPLY_OK;
 320                         write(fd, &cmd, sizeof(cmd));
 321                         bytes = read(fd, &keyid, sizeof(keyid));
 322                         if (bytes != sizeof(keyid)) {
 323                                 ret = 1;
 324                         }
 325                         if (ret == 0) {
 326                                 logthing(LOGTHING_INFO,
 327                                                 "Deleting 0x%" PRIX64
 328                                                 ", result: %d",
 329                                                 keyid,
 330                                                 config.dbbackend->delete_key(
 331                                                         keyid, false));
 332                         }
 333                         break;
 334                 case KEYD_CMD_GETFULLKEYID:
 335                         cmd = KEYD_REPLY_OK;
 336                         write(fd, &cmd, sizeof(cmd));
 337                         bytes = read(fd, &keyid, sizeof(keyid));
 338                         if (bytes != sizeof(keyid)) {
 339                                 ret = 1;
 340                         }
 341                         if (ret == 0) {
 342                                 keyid = config.dbbackend->getfullkeyid(keyid);
 343                                 cmd = sizeof(keyid);
 344                                 write(fd, &cmd, sizeof(cmd));
 345                                 write(fd, &keyid, sizeof(keyid));
 346                         }
 347                         break;
 348                 case KEYD_CMD_KEYITER:
 349                         cmd = KEYD_REPLY_OK;
 350                         write(fd, &cmd, sizeof(cmd));
 351                         config.dbbackend->iterate_keys(iteratefunc,
 352                                         &fd);
 353                         bytes = 0;
 354                         write(fd, &bytes, sizeof(bytes));
 355                         break;
 356                 case KEYD_CMD_CLOSE:
 357                         cmd = KEYD_REPLY_OK;
 358                         write(fd, &cmd, sizeof(cmd));
 359                         ret = 1;
 360                         break;
 361                 case KEYD_CMD_QUIT:
 362                         cmd = KEYD_REPLY_OK;
 363                         write(fd, &cmd, sizeof(cmd));
 364                         logthing(LOGTHING_NOTICE,
 365                                 "Exiting due to quit request.");
 366                         ret = 1;
 367                         trytocleanup();
 368                         break;
 369                 case KEYD_CMD_STATS:
 370                         cmd = KEYD_REPLY_OK;
 371                         write(fd, &cmd, sizeof(cmd));
 372                         cmd = sizeof(*stats);
 373                         write(fd, &cmd, sizeof(cmd));
 374                         write(fd, stats,
 375                                 sizeof(*stats));
 376                         break;
 377                 case KEYD_CMD_GETSKSHASH:
 378                         cmd = KEYD_REPLY_OK;
 379                         write(fd, &cmd, sizeof(cmd));
 380                         bytes = read(fd, hash.hash, sizeof(hash.hash));
 381                         if (bytes != sizeof(hash.hash)) {
 382                                 ret = 1;
 383                         }
 384                         storebuf.offset = 0;
 385                         if (ret == 0) {
 386                                 logthing(LOGTHING_INFO,
 387                                                 "Fetching by hash"
 388                                                 ", result: %d",
 389                                                 config.dbbackend->
 390                                                 fetch_key_skshash(&hash,
 391                                                         &key));
 392                                 if (key != NULL) {
 393                                         storebuf.size = 8192;
 394                                         storebuf.buffer = malloc(8192);
 395
 396                                         flatten_publickey(key,
 397                                                         &packets,
 398                                                         &list_end);
 399                                         write_openpgp_stream(buffer_putchar,
 400                                                         &storebuf,
 401                                                         packets);
 402                                         logthing(LOGTHING_TRACE,
 403                                                         "Sending %d bytes.",
 404                                                         storebuf.offset);
 405                                         write(fd, &storebuf.offset,
 406                                                 sizeof(storebuf.offset));
 407                                         write(fd, storebuf.buffer,
 408                                                 storebuf.offset);
 409
 410                                         free(storebuf.buffer);
 411                                         storebuf.buffer = NULL;
 412                                         storebuf.size = storebuf.offset = 0;
 413                                         free_packet_list(packets);
 414                                         packets = list_end = NULL;
 415                                         free_publickey(key);
 416                                         key = NULL;
 417                                 } else {
 418                                         write(fd, &storebuf.offset,
 419                                                 sizeof(storebuf.offset));
 420                                 }
 421                         }
 422                         break;
 423
 424                 default:
 425                         logthing(LOGTHING_ERROR, "Got unknown command: %d",
 426                                         cmd);
 427                         cmd = KEYD_REPLY_UNKNOWN_CMD;
 428                         write(fd, &cmd, sizeof(cmd));
 429                 }
 430         }
 431
 432         return(ret);
 433 }
 434
 435 int sock_close(int fd)
 436 {
 437         shutdown(fd, SHUT_RDWR);
 438         return close(fd);
 439 }
 440
 441 int sock_accept(int fd)
 442 {
 443         struct sockaddr_un sock;
 444         socklen_t          socklen;
 445         int    srv = -1;
 446         int    ret = -1;
 447
 448         socklen = sizeof(sock);
 449         srv = accept(fd, (struct sockaddr *) &sock, &socklen);
 450         if (srv != -1) {
 451                 ret = fcntl(srv, F_SETFD, FD_CLOEXEC);
 452         }
 453
 454         if (ret != -1) {
 455                 stats->connects++;
 456         }
 457
 458         return (srv);
 459 }
 460
 461 static void usage(void)
 462 {
 463         puts("keyd " ONAK_VERSION " - backend key serving daemon for the "
 464                 "onak PGP keyserver.\n");
 465         puts("Usage:\n");
 466         puts("\tkeyd [options]\n");
 467         puts("\tOptions:\n:");
 468         puts("-c <file> - use <file> as the config file");
 469         puts("-f        - run in the foreground");
 470         puts("-h        - show this help text");
 471         exit(EXIT_FAILURE);
 472 }
 473
 474 int main(int argc, char *argv[])
 475 {
 476         int fd = -1, maxfd, i, clients[MAX_CLIENTS];
 477         fd_set rfds;
 478         char sockname[1024];
 479         char *configfile = NULL;
 480         bool foreground = false;
 481         int optchar;
 482
 483         while ((optchar = getopt(argc, argv, "c:fh")) != -1 ) {
 484                 switch (optchar) {
 485                 case 'c':
 486                         configfile = strdup(optarg);
 487                         break;
 488                 case 'f':
 489                         foreground = true;
 490                         break;
 491                 case 'h':
 492                 default:
 493                         usage();
 494                         break;
 495                 }
 496         }
 497
 498         readconfig(configfile);
 499         free(configfile);
 500         configfile = NULL;
 501         initlogthing("keyd", config.logfile);
 502         config.use_keyd = false;
 503
 504         if (!foreground) {
 505                 daemonize();
 506         }
 507
 508         catchsignals();
 509         signal(SIGPIPE, SIG_IGN);
 510
 511
 512         stats = calloc(1, sizeof(*stats));
 513         if (!stats) {
 514                 logthing(LOGTHING_ERROR,
 515                         "Couldn't allocate memory for stats structure.");
 516                 exit(EXIT_FAILURE);
 517         }
 518         stats->started = time(NULL);
 519
 520         snprintf(sockname, 1023, "%s/%s", config.db_dir, KEYD_SOCKET);
 521         fd = sock_init(sockname);
 522
 523         if (fd != -1) {
 524                 FD_ZERO(&rfds);
 525                 FD_SET(fd, &rfds);
 526                 maxfd = fd;
 527                 memset(clients, -1, sizeof (clients));
 528
 529                 config.dbbackend->initdb(false);
 530
 531                 logthing(LOGTHING_NOTICE, "Accepting connections.");
 532                 while (!cleanup() && select(maxfd + 1, &rfds, NULL, NULL, NULL) != -1) {
 533                         /*
 534                          * Deal with existing clients first; if we're at our
 535                          * connection limit then processing them might free
 536                          * things up and let us accept the next client below.
 537                          */
 538                         for (i = 0; i < MAX_CLIENTS; i++) {
 539                                 if (clients[i] != -1 &&
 540                                                 FD_ISSET(clients[i], &rfds)) {
 541                                         logthing(LOGTHING_DEBUG,
 542                                                 "Handling connection for client %d.", i);
 543                                         if (sock_do(clients[i])) {
 544                                                 sock_close(clients[i]);
 545                                                 clients[i] = -1;
 546                                                 logthing(LOGTHING_DEBUG,
 547                                                         "Closed connection for client %d.", i);
 548                                         }
 549                                 }
 550                         }
 551                         /*
 552                          * Check if we have a new incoming connection to accept.
 553                          */
 554                         if (FD_ISSET(fd, &rfds)) {
 555                                 for (i = 0; i < MAX_CLIENTS; i++) {
 556                                         if (clients[i] == -1) {
 557                                                 break;
 558                                         }
 559                                 }
 560                                 if (i < MAX_CLIENTS) {
 561                                         logthing(LOGTHING_INFO,
 562                                                 "Accepted connection %d.", i);
 563                                         clients[i] = sock_accept(fd);
 564                                 }
 565                         }
 566                         FD_ZERO(&rfds);
 567                         FD_SET(fd, &rfds);
 568                         maxfd = fd;
 569                         for (i = 0; i < MAX_CLIENTS; i++) {
 570                                 if (clients[i] != -1) {
 571                                         FD_SET(clients[i], &rfds);
 572                                         maxfd = (maxfd > clients[i]) ?
 573                                                         maxfd : clients[i];
 574                                 }
 575                         }
 576                 }
 577                 config.dbbackend->cleanupdb();
 578                 sock_close(fd);
 579                 unlink(sockname);
 580         }
 581
 582         free(stats);
 583
 584         cleanuplogthing();
 585         cleanupconfig();
 586
 587         return(EXIT_SUCCESS);
 588 }