1 /* 2 * Copyright (c) 1997 - 2001 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "iprop.h" 35 36 RCSID("$Id: ipropd_master.c,v 1.22 2001/02/14 23:00:16 assar Exp $"); 37 38 static krb5_log_facility *log_facility; 39 40 static int 41 make_signal_socket (krb5_context context) 42 { 43 struct sockaddr_un addr; 44 int fd; 45 46 fd = socket (AF_UNIX, SOCK_DGRAM, 0); 47 if (fd < 0) 48 krb5_err (context, 1, errno, "socket AF_UNIX"); 49 memset (&addr, 0, sizeof(addr)); 50 addr.sun_family = AF_UNIX; 51 strlcpy (addr.sun_path, KADM5_LOG_SIGNAL, sizeof(addr.sun_path)); 52 unlink (addr.sun_path); 53 if (bind (fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) 54 krb5_err (context, 1, errno, "bind %s", addr.sun_path); 55 return fd; 56 } 57 58 static int 59 make_listen_socket (krb5_context context) 60 { 61 int fd; 62 int one = 1; 63 struct sockaddr_in addr; 64 65 fd = socket (AF_INET, SOCK_STREAM, 0); 66 if (fd < 0) 67 krb5_err (context, 1, errno, "socket AF_INET"); 68 setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)); 69 memset (&addr, 0, sizeof(addr)); 70 addr.sin_family = AF_INET; 71 addr.sin_port = krb5_getportbyname (context, 72 IPROP_SERVICE, "tcp", IPROP_PORT); 73 if(bind(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) 74 krb5_err (context, 1, errno, "bind"); 75 if (listen(fd, SOMAXCONN) < 0) 76 krb5_err (context, 1, errno, "listen"); 77 return fd; 78 } 79 80 struct slave { 81 int fd; 82 struct sockaddr_in addr; 83 char *name; 84 krb5_auth_context ac; 85 u_int32_t version; 86 struct slave *next; 87 }; 88 89 typedef struct slave slave; 90 91 static int 92 check_acl (krb5_context context, const char *name) 93 { 94 FILE *fp; 95 char buf[256]; 96 int ret = 1; 97 98 fp = fopen (KADM5_SLAVE_ACL, "r"); 99 if (fp == NULL) 100 return 1; 101 while (fgets(buf, sizeof(buf), fp) != NULL) { 102 if (buf[strlen(buf) - 1 ] == '\n') 103 buf[strlen(buf) - 1 ] = '\0'; 104 if (strcmp (buf, name) == 0) { 105 ret = 0; 106 break; 107 } 108 } 109 fclose (fp); 110 return ret; 111 } 112 113 static void 114 add_slave (krb5_context context, krb5_keytab keytab, slave **root, int fd) 115 { 116 krb5_principal server; 117 krb5_error_code ret; 118 slave *s; 119 socklen_t addr_len; 120 krb5_ticket *ticket = NULL; 121 char hostname[128]; 122 123 s = malloc(sizeof(*s)); 124 if (s == NULL) { 125 krb5_warnx (context, "add_slave: no memory"); 126 return; 127 } 128 s->name = NULL; 129 s->ac = NULL; 130 131 addr_len = sizeof(s->addr); 132 s->fd = accept (fd, (struct sockaddr *)&s->addr, &addr_len); 133 if (s->fd < 0) { 134 krb5_warn (context, errno, "accept"); 135 goto error; 136 } 137 gethostname(hostname, sizeof(hostname)); 138 ret = krb5_sname_to_principal (context, hostname, IPROP_NAME, 139 KRB5_NT_SRV_HST, &server); 140 if (ret) { 141 krb5_warn (context, ret, "krb5_sname_to_principal"); 142 goto error; 143 } 144 145 ret = krb5_recvauth (context, &s->ac, &s->fd, 146 IPROP_VERSION, server, 0, keytab, &ticket); 147 krb5_free_principal (context, server); 148 if (ret) { 149 krb5_warn (context, ret, "krb5_recvauth"); 150 goto error; 151 } 152 ret = krb5_unparse_name (context, ticket->client, &s->name); 153 if (ret) { 154 krb5_warn (context, ret, "krb5_unparse_name"); 155 goto error; 156 } 157 if (check_acl (context, s->name)) { 158 krb5_warnx (context, "%s not in acl", s->name); 159 goto error; 160 } 161 krb5_free_ticket (context, ticket); 162 krb5_warnx (context, "connection from %s", s->name); 163 164 s->version = 0; 165 s->next = *root; 166 *root = s; 167 return; 168 error: 169 if (s->name) 170 free (s->name); 171 if (s->ac) 172 krb5_auth_con_free(context, s->ac); 173 if (ticket) 174 krb5_free_ticket (context, ticket); 175 close (s->fd); 176 free(s); 177 } 178 179 static void 180 remove_slave (krb5_context context, slave *s, slave **root) 181 { 182 slave **p; 183 184 close (s->fd); 185 free (s->name); 186 krb5_auth_con_free (context, s->ac); 187 188 for (p = root; *p; p = &(*p)->next) 189 if (*p == s) { 190 *p = s->next; 191 break; 192 } 193 free (s); 194 } 195 196 struct prop_context { 197 krb5_auth_context auth_context; 198 int fd; 199 }; 200 201 static int 202 prop_one (krb5_context context, HDB *db, hdb_entry *entry, void *v) 203 { 204 krb5_error_code ret; 205 krb5_data data; 206 struct slave *slave = (struct slave *)v; 207 208 ret = hdb_entry2value (context, entry, &data); 209 if (ret) 210 return ret; 211 ret = krb5_data_realloc (&data, data.length + 4); 212 if (ret) { 213 krb5_data_free (&data); 214 return ret; 215 } 216 memmove ((char *)data.data + 4, data.data, data.length - 4); 217 _krb5_put_int (data.data, ONE_PRINC, 4); 218 219 ret = krb5_write_priv_message (context, slave->ac, &slave->fd, &data); 220 krb5_data_free (&data); 221 return ret; 222 } 223 224 static int 225 send_complete (krb5_context context, slave *s, 226 const char *database, u_int32_t current_version) 227 { 228 krb5_error_code ret; 229 HDB *db; 230 krb5_data data; 231 char buf[8]; 232 233 ret = hdb_create (context, &db, database); 234 if (ret) 235 krb5_err (context, 1, ret, "hdb_create: %s", database); 236 ret = db->open (context, db, O_RDONLY, 0); 237 if (ret) 238 krb5_err (context, 1, ret, "db->open"); 239 240 _krb5_put_int(buf, TELL_YOU_EVERYTHING, 4); 241 242 data.data = buf; 243 data.length = 4; 244 245 ret = krb5_write_priv_message(context, s->ac, &s->fd, &data); 246 247 if (ret) 248 krb5_err (context, 1, ret, "krb5_write_priv_message"); 249 250 ret = hdb_foreach (context, db, 0, prop_one, s); 251 if (ret) 252 krb5_err (context, 1, ret, "hdb_foreach"); 253 254 _krb5_put_int (buf, NOW_YOU_HAVE, 4); 255 _krb5_put_int (buf + 4, current_version, 4); 256 data.length = 8; 257 258 ret = krb5_write_priv_message(context, s->ac, &s->fd, &data); 259 260 if (ret) 261 krb5_err (context, 1, ret, "krb5_write_priv_message"); 262 263 return 0; 264 } 265 266 static int 267 send_diffs (krb5_context context, slave *s, int log_fd, 268 const char *database, u_int32_t current_version) 269 { 270 krb5_storage *sp; 271 u_int32_t ver; 272 time_t timestamp; 273 enum kadm_ops op; 274 u_int32_t len; 275 off_t right, left; 276 krb5_data data; 277 int ret = 0; 278 279 if (s->version == current_version) 280 return 0; 281 282 sp = kadm5_log_goto_end (log_fd); 283 right = sp->seek(sp, 0, SEEK_CUR); 284 for (;;) { 285 if (kadm5_log_previous (sp, &ver, ×tamp, &op, &len)) 286 abort (); 287 left = sp->seek(sp, -16, SEEK_CUR); 288 if (ver == s->version) 289 return 0; 290 if (ver == s->version + 1) 291 break; 292 if (left == 0) 293 return send_complete (context, s, database, current_version); 294 } 295 krb5_data_alloc (&data, right - left + 4); 296 sp->fetch (sp, (char *)data.data + 4, data.length - 4); 297 krb5_storage_free(sp); 298 299 _krb5_put_int(data.data, FOR_YOU, 4); 300 301 ret = krb5_write_priv_message(context, s->ac, &s->fd, &data); 302 303 if (ret) { 304 krb5_warn (context, ret, "krb5_write_priv_message"); 305 return 1; 306 } 307 return 0; 308 } 309 310 static int 311 process_msg (krb5_context context, slave *s, int log_fd, 312 const char *database, u_int32_t current_version) 313 { 314 int ret = 0; 315 krb5_data out; 316 krb5_storage *sp; 317 int32_t tmp; 318 319 ret = krb5_read_priv_message(context, s->ac, &s->fd, &out); 320 if(ret) { 321 krb5_warn (context, ret, "error reading message from %s", s->name); 322 return 1; 323 } 324 325 sp = krb5_storage_from_mem (out.data, out.length); 326 krb5_ret_int32 (sp, &tmp); 327 switch (tmp) { 328 case I_HAVE : 329 krb5_ret_int32 (sp, &tmp); 330 s->version = tmp; 331 ret = send_diffs (context, s, log_fd, database, current_version); 332 break; 333 case FOR_YOU : 334 default : 335 krb5_warnx (context, "Ignoring command %d", tmp); 336 break; 337 } 338 339 krb5_data_free (&out); 340 return ret; 341 } 342 343 static char *realm; 344 static int version_flag; 345 static int help_flag; 346 static char *keytab_str = "HDB:"; 347 static char *database; 348 349 static struct getargs args[] = { 350 { "realm", 'r', arg_string, &realm }, 351 { "keytab", 'k', arg_string, &keytab_str, 352 "keytab to get authentication from", "kspec" }, 353 { "database", 'd', arg_string, &database, "database", "file"}, 354 { "version", 0, arg_flag, &version_flag }, 355 { "help", 0, arg_flag, &help_flag } 356 }; 357 static int num_args = sizeof(args) / sizeof(args[0]); 358 359 int 360 main(int argc, char **argv) 361 { 362 krb5_error_code ret; 363 krb5_context context; 364 void *kadm_handle; 365 kadm5_server_context *server_context; 366 kadm5_config_params conf; 367 int signal_fd, listen_fd; 368 int log_fd; 369 slave *slaves = NULL; 370 u_int32_t current_version, old_version = 0; 371 krb5_keytab keytab; 372 int optind; 373 374 optind = krb5_program_setup(&context, argc, argv, args, num_args, NULL); 375 376 if(help_flag) 377 krb5_std_usage(0, args, num_args); 378 if(version_flag) { 379 print_version(NULL); 380 exit(0); 381 } 382 383 krb5_openlog (context, "ipropd-master", &log_facility); 384 krb5_set_warn_dest(context, log_facility); 385 386 ret = krb5_kt_register(context, &hdb_kt_ops); 387 if(ret) 388 krb5_err(context, 1, ret, "krb5_kt_register"); 389 390 ret = krb5_kt_resolve(context, keytab_str, &keytab); 391 if(ret) 392 krb5_err(context, 1, ret, "krb5_kt_resolve: %s", keytab_str); 393 394 memset(&conf, 0, sizeof(conf)); 395 if(realm) { 396 conf.mask |= KADM5_CONFIG_REALM; 397 conf.realm = realm; 398 } 399 ret = kadm5_init_with_skey_ctx (context, 400 KADM5_ADMIN_SERVICE, 401 NULL, 402 KADM5_ADMIN_SERVICE, 403 &conf, 0, 0, 404 &kadm_handle); 405 if (ret) 406 krb5_err (context, 1, ret, "kadm5_init_with_password_ctx"); 407 408 server_context = (kadm5_server_context *)kadm_handle; 409 410 log_fd = open (server_context->log_context.log_file, O_RDONLY, 0); 411 if (log_fd < 0) 412 krb5_err (context, 1, errno, "open %s", 413 server_context->log_context.log_file); 414 415 signal_fd = make_signal_socket (context); 416 listen_fd = make_listen_socket (context); 417 418 signal (SIGPIPE, SIG_IGN); 419 420 for (;;) { 421 slave *p; 422 fd_set readset; 423 int max_fd = 0; 424 struct timeval to = {30, 0}; 425 u_int32_t vers; 426 427 if (signal_fd >= FD_SETSIZE || listen_fd >= FD_SETSIZE) 428 krb5_errx (context, 1, "fd too large"); 429 430 FD_ZERO(&readset); 431 FD_SET(signal_fd, &readset); 432 max_fd = max(max_fd, signal_fd); 433 FD_SET(listen_fd, &readset); 434 max_fd = max(max_fd, listen_fd); 435 436 for (p = slaves; p != NULL; p = p->next) { 437 FD_SET(p->fd, &readset); 438 max_fd = max(max_fd, p->fd); 439 } 440 441 ret = select (max_fd + 1, 442 &readset, NULL, NULL, &to); 443 if (ret < 0) { 444 if (errno == EINTR) 445 continue; 446 else 447 krb5_err (context, 1, errno, "select"); 448 } 449 450 if (ret == 0) { 451 old_version = current_version; 452 kadm5_log_get_version_fd (log_fd, ¤t_version); 453 454 if (current_version > old_version) 455 for (p = slaves; p != NULL; p = p->next) 456 send_diffs (context, p, log_fd, database, current_version); 457 } 458 459 if (ret && FD_ISSET(signal_fd, &readset)) { 460 struct sockaddr_un peer_addr; 461 socklen_t peer_len = sizeof(peer_addr); 462 463 if(recvfrom(signal_fd, &vers, sizeof(vers), 0, 464 (struct sockaddr *)&peer_addr, &peer_len) < 0) { 465 krb5_warn (context, errno, "recvfrom"); 466 continue; 467 } 468 --ret; 469 old_version = current_version; 470 kadm5_log_get_version_fd (log_fd, ¤t_version); 471 for (p = slaves; p != NULL; p = p->next) 472 send_diffs (context, p, log_fd, database, current_version); 473 } 474 475 for(p = slaves; p != NULL; p = p->next) 476 if (FD_ISSET(p->fd, &readset)) { 477 --ret; 478 if(process_msg (context, p, log_fd, database, current_version)) 479 remove_slave (context, p, &slaves); 480 } 481 482 if (ret && FD_ISSET(listen_fd, &readset)) { 483 add_slave (context, keytab, &slaves, listen_fd); 484 --ret; 485 } 486 487 } 488 489 return 0; 490 } 491