keyd.c

   1 /*
   2  * keyd.c - key retrieval daemon
   3  *
   4  * Jonathan McDowell <noodles@earth.li>
   5  *
   6  * Copyright 2004 Project Purple
   7  */
   8
   9 #include <errno.h>
  10 #include <fcntl.h>
  11 #include <getopt.h>
  12 #include <signal.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <sys/select.h>
  17 #include <sys/socket.h>
  18 #include <sys/types.h>
  19 #include <sys/un.h>
  20 #include <time.h>
  21 #include <unistd.h>
  22
  23 #include "charfuncs.h"
  24 #include "cleanup.h"
  25 #include "keyd.h"
  26 #include "keydb.h"
  27 #include "keyid.h"
  28 #include "keystructs.h"
  29 #include "log.h"
  30 #include "mem.h"
  31 #include "onak-conf.h"
  32 #include "parsekey.h"
  33 #include "version.h"
  34
  35 static struct keyd_stats *stats;
  36
  37 void daemonize(void)
  38 {
  39         pid_t pid;
  40
  41         pid = fork();
  42
  43         if (pid < 0) {
  44                 logthing(LOGTHING_CRITICAL,
  45                         "Failed to fork into background: %d (%s)",
  46                         errno,
  47                         strerror(errno));
  48                 exit(EXIT_FAILURE);
  49         } else if (pid > 0) {
  50                 logthing(LOGTHING_INFO, "Backgrounded as pid %d.", pid);
  51                 exit(EXIT_SUCCESS);
  52         }
  53
  54         pid = setsid();
  55
  56         freopen("/dev/null", "r", stdin);
  57         freopen("/dev/null", "w", stdout);
  58         freopen("/dev/null", "w", stderr);
  59
  60         return;
  61 }
  62
  63 void iteratefunc(void *ctx, struct openpgp_publickey *key)
  64 {
  65         struct openpgp_packet_list *packets = NULL;
  66         struct openpgp_packet_list *list_end = NULL;
  67         struct buffer_ctx           storebuf;
  68         int                         ret = 0;
  69         int                         *fd = (int *) ctx;
  70
  71         if (key != NULL) {
  72                 storebuf.offset = 0;
  73                 storebuf.size = 8192;
  74                 storebuf.buffer = malloc(8192);
  75
  76                 logthing(LOGTHING_TRACE,
  77                                 "Iterating over 0x%016" PRIX64 ".",
  78                                 get_keyid(key));
  79
  80                 flatten_publickey(key,
  81                                 &packets,
  82                                 &list_end);
  83                 write_openpgp_stream(buffer_putchar,
  84                                 &storebuf,
  85                                 packets);
  86                 logthing(LOGTHING_TRACE,
  87                                 "Sending %d bytes.",
  88                                 storebuf.offset);
  89                 ret = write(*fd, &storebuf.offset,
  90                         sizeof(storebuf.offset));
  91                 if (ret != 0) {
  92                         write(*fd, storebuf.buffer,
  93                                 storebuf.offset);
  94                 }
  95
  96                 free(storebuf.buffer);
  97                 storebuf.buffer = NULL;
  98                 storebuf.size = storebuf.offset = 0;
  99                 free_packet_list(packets);
 100                 packets = list_end = NULL;
 101         }
 102
 103         return;
 104 }
 105
 106 int sock_init(const char *sockname)
 107 {
 108         struct sockaddr_un sock;
 109         int                fd = -1;
 110         int                ret = -1;
 111
 112         fd = socket(PF_UNIX, SOCK_STREAM, 0);
 113         if (fd != -1) {
 114                 ret = fcntl(fd, F_SETFD, 1);
 115         }
 116
 117         if (ret != -1) {
 118                 sock.sun_family = AF_UNIX;
 119                 strncpy(sock.sun_path, sockname, sizeof(sock.sun_path) - 1);
 120                 unlink(sockname);
 121                 ret = bind(fd, (struct sockaddr *) &sock, sizeof(sock));
 122         }
 123
 124         if (ret != -1) {
 125                 ret = listen(fd, 5);
 126         }
 127
 128         return fd;
 129 }
 130
 131 int sock_do(int fd)
 132 {
 133         uint32_t cmd = KEYD_CMD_UNKNOWN;
 134         ssize_t  bytes = 0;
 135         ssize_t  count = 0;
 136         int      ret = 0;
 137         uint64_t keyid = 0;
 138         char     *search = NULL;
 139         struct openpgp_publickey *key = NULL;
 140         struct openpgp_packet_list *packets = NULL;
 141         struct openpgp_packet_list *list_end = NULL;
 142         struct buffer_ctx storebuf;
 143
 144         /*
 145          * Get the command from the client.
 146          */
 147         bytes = read(fd, &cmd, sizeof(cmd));
 148
 149         logthing(LOGTHING_DEBUG, "Read %d bytes, command: %d", bytes, cmd);
 150
 151         if (bytes != sizeof(cmd)) {
 152                 ret = 1;
 153         }
 154
 155         if (ret == 0) {
 156                 if (cmd < KEYD_CMD_LAST) {
 157                         stats->command_stats[cmd]++;
 158                 } else {
 159                         stats->command_stats[KEYD_CMD_UNKNOWN]++;
 160                 }
 161                 switch (cmd) {
 162                 case KEYD_CMD_VERSION:
 163                         cmd = KEYD_REPLY_OK;
 164                         write(fd, &cmd, sizeof(cmd));
 165                         cmd = sizeof(keyd_version);
 166                         write(fd, &cmd, sizeof(cmd));
 167                         write(fd, &keyd_version, sizeof(keyd_version));
 168                         break;
 169                 case KEYD_CMD_GET:
 170                         cmd = KEYD_REPLY_OK;
 171                         write(fd, &cmd, sizeof(cmd));
 172                         bytes = read(fd, &keyid, sizeof(keyid));
 173                         if (bytes != sizeof(keyid)) {
 174                                 ret = 1;
 175                         }
 176                         storebuf.offset = 0;
 177                         if (ret == 0) {
 178                                 logthing(LOGTHING_INFO,
 179                                                 "Fetching 0x%" PRIX64
 180                                                 ", result: %d",
 181                                                 keyid,
 182                                                 config.dbbackend->
 183                                                 fetch_key(keyid, &key, false));
 184                                 if (key != NULL) {
 185                                         storebuf.size = 8192;
 186                                         storebuf.buffer = malloc(8192);
 187
 188                                         flatten_publickey(key,
 189                                                         &packets,
 190                                                         &list_end);
 191                                         write_openpgp_stream(buffer_putchar,
 192                                                         &storebuf,
 193                                                         packets);
 194                                         logthing(LOGTHING_TRACE,
 195                                                         "Sending %d bytes.",
 196                                                         storebuf.offset);
 197                                         write(fd, &storebuf.offset,
 198                                                 sizeof(storebuf.offset));
 199                                         write(fd, storebuf.buffer,
 200                                                 storebuf.offset);
 201
 202                                         free(storebuf.buffer);
 203                                         storebuf.buffer = NULL;
 204                                         storebuf.size = storebuf.offset = 0;
 205                                         free_packet_list(packets);
 206                                         packets = list_end = NULL;
 207                                         free_publickey(key);
 208                                         key = NULL;
 209                                 } else {
 210                                         write(fd, &storebuf.offset,
 211                                                 sizeof(storebuf.offset));
 212                                 }
 213                         }
 214                         break;
 215                 case KEYD_CMD_GETTEXT:
 216                         cmd = KEYD_REPLY_OK;
 217                         write(fd, &cmd, sizeof(cmd));
 218                         bytes = read(fd, &count, sizeof(count));
 219                         if (bytes != sizeof(count)) {
 220                                 ret = 1;
 221                         }
 222                         storebuf.offset = 0;
 223                         if (ret == 0) {
 224                                 search = malloc(count+1);
 225                                 read(fd, search, count);
 226                                 search[count] = 0;
 227                                 logthing(LOGTHING_INFO,
 228                                                 "Fetching %s, result: %d",
 229                                                 search,
 230                                                 config.dbbackend->
 231                                                 fetch_key_text(search, &key));
 232                                 if (key != NULL) {
 233                                         storebuf.size = 8192;
 234                                         storebuf.buffer = malloc(8192);
 235
 236                                         flatten_publickey(key,
 237                                                         &packets,
 238                                                         &list_end);
 239                                         write_openpgp_stream(buffer_putchar,
 240                                                         &storebuf,
 241                                                         packets);
 242                                         logthing(LOGTHING_TRACE,
 243                                                         "Sending %d bytes.",
 244                                                         storebuf.offset);
 245                                         write(fd, &storebuf.offset,
 246                                                 sizeof(storebuf.offset));
 247                                         write(fd, storebuf.buffer,
 248                                                 storebuf.offset);
 249
 250                                         free(storebuf.buffer);
 251                                         storebuf.buffer = NULL;
 252                                         storebuf.size = storebuf.offset = 0;
 253                                         free_packet_list(packets);
 254                                         packets = list_end = NULL;
 255                                         free_publickey(key);
 256                                         key = NULL;
 257                                 } else {
 258                                         write(fd, &storebuf.offset,
 259                                                 sizeof(storebuf.offset));
 260                                 }
 261                         }
 262                         break;
 263                 case KEYD_CMD_STORE:
 264                         cmd = KEYD_REPLY_OK;
 265                         write(fd, &cmd, sizeof(cmd));
 266                         storebuf.offset = 0;
 267                         bytes = read(fd, &storebuf.size,
 268                                         sizeof(storebuf.size));
 269                         logthing(LOGTHING_TRACE, "Reading %d bytes.",
 270                                         storebuf.size);
 271                         if (bytes != sizeof(storebuf.size)) {
 272                                 ret = 1;
 273                         }
 274                         if (ret == 0 && storebuf.size > 0) {
 275                                 storebuf.buffer = malloc(storebuf.size);
 276                                 bytes = count = 0;
 277                                 while (bytes >= 0 && count < storebuf.size) {
 278                                         bytes = read(fd,
 279                                                 &storebuf.buffer[count],
 280                                                 storebuf.size - count);
 281                                         logthing(LOGTHING_TRACE,
 282                                                         "Read %d bytes.",
 283                                                         bytes);
 284                                         count += bytes;
 285                                 }
 286                                 read_openpgp_stream(buffer_fetchchar,
 287                                                 &storebuf,
 288                                                 &packets,
 289                                                 0);
 290                                 parse_keys(packets, &key);
 291                                 config.dbbackend->store_key(key, false, false);
 292                                 free_packet_list(packets);
 293                                 packets = NULL;
 294                                 free_publickey(key);
 295                                 key = NULL;
 296                                 free(storebuf.buffer);
 297                                 storebuf.buffer = NULL;
 298                                 storebuf.size = storebuf.offset = 0;
 299                         }
 300                         break;
 301                 case KEYD_CMD_DELETE:
 302                         cmd = KEYD_REPLY_OK;
 303                         write(fd, &cmd, sizeof(cmd));
 304                         bytes = read(fd, &keyid, sizeof(keyid));
 305                         if (bytes != sizeof(keyid)) {
 306                                 ret = 1;
 307                         }
 308                         if (ret == 0) {
 309                                 logthing(LOGTHING_INFO,
 310                                                 "Deleting 0x%" PRIX64
 311                                                 ", result: %d",
 312                                                 keyid,
 313                                                 config.dbbackend->delete_key(
 314                                                         keyid, false));
 315                         }
 316                         break;
 317                 case KEYD_CMD_GETFULLKEYID:
 318                         cmd = KEYD_REPLY_OK;
 319                         write(fd, &cmd, sizeof(cmd));
 320                         bytes = read(fd, &keyid, sizeof(keyid));
 321                         if (bytes != sizeof(keyid)) {
 322                                 ret = 1;
 323                         }
 324                         if (ret == 0) {
 325                                 keyid = config.dbbackend->getfullkeyid(keyid);
 326                                 cmd = sizeof(keyid);
 327                                 write(fd, &cmd, sizeof(cmd));
 328                                 write(fd, &keyid, sizeof(keyid));
 329                         }
 330                         break;
 331                 case KEYD_CMD_KEYITER:
 332                         cmd = KEYD_REPLY_OK;
 333                         write(fd, &cmd, sizeof(cmd));
 334                         config.dbbackend->iterate_keys(iteratefunc,
 335                                         &fd);
 336                         bytes = 0;
 337                         write(fd, &bytes, sizeof(bytes));
 338                         break;
 339                 case KEYD_CMD_CLOSE:
 340                         cmd = KEYD_REPLY_OK;
 341                         write(fd, &cmd, sizeof(cmd));
 342                         ret = 1;
 343                         break;
 344                 case KEYD_CMD_QUIT:
 345                         cmd = KEYD_REPLY_OK;
 346                         write(fd, &cmd, sizeof(cmd));
 347                         logthing(LOGTHING_NOTICE,
 348                                 "Exiting due to quit request.");
 349                         ret = 1;
 350                         trytocleanup();
 351                         break;
 352                 case KEYD_CMD_STATS:
 353                         cmd = KEYD_REPLY_OK;
 354                         write(fd, &cmd, sizeof(cmd));
 355                         cmd = sizeof(*stats);
 356                         write(fd, &cmd, sizeof(cmd));
 357                         write(fd, stats,
 358                                 sizeof(*stats));
 359                         break;
 360                 default:
 361                         logthing(LOGTHING_ERROR, "Got unknown command: %d",
 362                                         cmd);
 363                         cmd = KEYD_REPLY_UNKNOWN_CMD;
 364                         write(fd, &cmd, sizeof(cmd));
 365                 }
 366         }
 367
 368         return(ret);
 369 }
 370
 371 int sock_close(int fd)
 372 {
 373         shutdown(fd, SHUT_RDWR);
 374         return close(fd);
 375 }
 376
 377 int sock_accept(int fd)
 378 {
 379         struct sockaddr_un sock;
 380         socklen_t          socklen;
 381         int    srv = -1;
 382         int    ret = -1;
 383
 384         socklen = sizeof(sock);
 385         srv = accept(fd, (struct sockaddr *) &sock, &socklen);
 386         if (srv != -1) {
 387                 ret = fcntl(srv, F_SETFD, 1);
 388         }
 389
 390         if (ret != -1) {
 391                 stats->connects++;
 392                 while (!sock_do(srv)) ;
 393                 sock_close(srv);
 394         }
 395
 396         return 1;
 397 }
 398
 399 static void usage(void)
 400 {
 401         puts("keyd " ONAK_VERSION " - backend key serving daemon for the "
 402                 "onak PGP keyserver.\n");
 403         puts("Usage:\n");
 404         puts("\tkeyd [options]\n");
 405         puts("\tOptions:\n:");
 406         puts("-c <file> - use <file> as the config file");
 407         puts("-f        - run in the foreground");
 408         puts("-h        - show this help text");
 409         exit(EXIT_FAILURE);
 410 }
 411
 412 int main(int argc, char *argv[])
 413 {
 414         int fd = -1;
 415         fd_set rfds;
 416         char sockname[1024];
 417         char *configfile = NULL;
 418         bool foreground = false;
 419         int optchar;
 420
 421         while ((optchar = getopt(argc, argv, "c:fh")) != -1 ) {
 422                 switch (optchar) {
 423                 case 'c':
 424                         configfile = strdup(optarg);
 425                         break;
 426                 case 'f':
 427                         foreground = true;
 428                         break;
 429                 case 'h':
 430                 default:
 431                         usage();
 432                         break;
 433                 }
 434         }
 435
 436         readconfig(configfile);
 437         free(configfile);
 438         configfile = NULL;
 439         initlogthing("keyd", config.logfile);
 440         config.use_keyd = false;
 441
 442         if (!foreground) {
 443                 daemonize();
 444         }
 445
 446         catchsignals();
 447         signal(SIGPIPE, SIG_IGN);
 448
 449
 450         stats = calloc(1, sizeof(*stats));
 451         if (!stats) {
 452                 logthing(LOGTHING_ERROR,
 453                         "Couldn't allocate memory for stats structure.");
 454                 exit(EXIT_FAILURE);
 455         }
 456         stats->started = time(NULL);
 457
 458         snprintf(sockname, 1023, "%s/%s", config.db_dir, KEYD_SOCKET);
 459         fd = sock_init(sockname);
 460
 461         if (fd != -1) {
 462                 FD_ZERO(&rfds);
 463                 FD_SET(fd, &rfds);
 464
 465                 config.dbbackend->initdb(false);
 466
 467                 logthing(LOGTHING_NOTICE, "Accepting connections.");
 468                 while (!cleanup() && select(fd + 1, &rfds, NULL, NULL, NULL) != -1) {
 469                         logthing(LOGTHING_INFO, "Accepted connection.");
 470                         sock_accept(fd);
 471                         FD_SET(fd, &rfds);
 472                 }
 473                 config.dbbackend->cleanupdb();
 474                 sock_close(fd);
 475                 unlink(sockname);
 476         }
 477
 478         free(stats);
 479
 480         cleanuplogthing();
 481         cleanupconfig();
 482
 483         return(EXIT_SUCCESS);
 484 }