| 1 | /* |
| 2 | Copyright (C) Andrew Tridgell 1998 |
| 3 | |
| 4 | This program is free software; you can redistribute it and/or modify |
| 5 | it under the terms of the GNU General Public License as published by |
| 6 | the Free Software Foundation; either version 2 of the License, or |
| 7 | (at your option) any later version. |
| 8 | |
| 9 | This program is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | GNU General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU General Public License |
| 15 | along with this program; if not, write to the Free Software |
| 16 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 17 | */ |
| 18 | |
| 19 | /* the socket based protocol for setting up a connection wit rsyncd */ |
| 20 | |
| 21 | #include "rsync.h" |
| 22 | |
| 23 | extern int module_id; |
| 24 | extern int read_only; |
| 25 | extern int verbose; |
| 26 | extern int rsync_port; |
| 27 | char *auth_user; |
| 28 | |
| 29 | int start_socket_client(char *host, char *path, int argc, char *argv[]) |
| 30 | { |
| 31 | int fd, i; |
| 32 | char *sargs[MAX_ARGS]; |
| 33 | int sargc=0; |
| 34 | char line[MAXPATHLEN]; |
| 35 | char *p, *user=NULL; |
| 36 | extern int remote_version; |
| 37 | extern int am_client; |
| 38 | extern int am_sender; |
| 39 | |
| 40 | if (*path == '/') { |
| 41 | rprintf(FERROR,"ERROR: The remote path must start with a module name\n"); |
| 42 | return -1; |
| 43 | } |
| 44 | |
| 45 | p = strchr(host, '@'); |
| 46 | if (p) { |
| 47 | user = host; |
| 48 | host = p+1; |
| 49 | *p = 0; |
| 50 | } |
| 51 | |
| 52 | if (!user) user = getenv("USER"); |
| 53 | if (!user) user = getenv("LOGNAME"); |
| 54 | |
| 55 | am_client = 1; |
| 56 | |
| 57 | fd = open_socket_out(host, rsync_port); |
| 58 | if (fd == -1) { |
| 59 | exit_cleanup(RERR_SOCKETIO); |
| 60 | } |
| 61 | |
| 62 | server_options(sargs,&sargc); |
| 63 | |
| 64 | sargs[sargc++] = "."; |
| 65 | |
| 66 | if (path && *path) |
| 67 | sargs[sargc++] = path; |
| 68 | |
| 69 | sargs[sargc] = NULL; |
| 70 | |
| 71 | io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION); |
| 72 | |
| 73 | if (!read_line(fd, line, sizeof(line)-1)) { |
| 74 | return -1; |
| 75 | } |
| 76 | |
| 77 | if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) { |
| 78 | return -1; |
| 79 | } |
| 80 | |
| 81 | p = strchr(path,'/'); |
| 82 | if (p) *p = 0; |
| 83 | io_printf(fd,"%s\n",path); |
| 84 | if (p) *p = '/'; |
| 85 | |
| 86 | while (1) { |
| 87 | if (!read_line(fd, line, sizeof(line)-1)) { |
| 88 | return -1; |
| 89 | } |
| 90 | |
| 91 | if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) { |
| 92 | auth_client(fd, user, line+18); |
| 93 | continue; |
| 94 | } |
| 95 | |
| 96 | if (strcmp(line,"@RSYNCD: OK") == 0) break; |
| 97 | rprintf(FINFO,"%s\n", line); |
| 98 | } |
| 99 | |
| 100 | for (i=0;i<sargc;i++) { |
| 101 | io_printf(fd,"%s\n", sargs[i]); |
| 102 | } |
| 103 | io_printf(fd,"\n"); |
| 104 | |
| 105 | if (remote_version > 17 && !am_sender) |
| 106 | io_start_multiplex_in(fd); |
| 107 | |
| 108 | return client_run(fd, fd, -1, argc, argv); |
| 109 | } |
| 110 | |
| 111 | |
| 112 | |
| 113 | static int rsync_module(int fd, int i) |
| 114 | { |
| 115 | int argc=0; |
| 116 | char *argv[MAX_ARGS]; |
| 117 | char **argp; |
| 118 | char line[MAXPATHLEN]; |
| 119 | uid_t uid = (uid_t)-2; |
| 120 | gid_t gid = (gid_t)-2; |
| 121 | char *p; |
| 122 | char *addr = client_addr(fd); |
| 123 | char *host = client_name(fd); |
| 124 | char *name = lp_name(i); |
| 125 | int use_chroot = lp_use_chroot(i); |
| 126 | int start_glob=0; |
| 127 | int ret; |
| 128 | char *request=NULL; |
| 129 | extern int am_sender; |
| 130 | extern int remote_version; |
| 131 | extern int am_root; |
| 132 | |
| 133 | if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) { |
| 134 | rprintf(FERROR,"rsync denied on module %s from %s (%s)\n", |
| 135 | name, client_name(fd), client_addr(fd)); |
| 136 | io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n", |
| 137 | name, client_name(fd), client_addr(fd)); |
| 138 | return -1; |
| 139 | } |
| 140 | |
| 141 | if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) { |
| 142 | if (errno) { |
| 143 | rprintf(FERROR,"failed to open lock file %s : %s\n", |
| 144 | lp_lock_file(i), strerror(errno)); |
| 145 | io_printf(fd,"@ERROR: failed to open lock file %s : %s\n", |
| 146 | lp_lock_file(i), strerror(errno)); |
| 147 | } else { |
| 148 | rprintf(FERROR,"max connections (%d) reached\n", |
| 149 | lp_max_connections(i)); |
| 150 | io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections(i)); |
| 151 | } |
| 152 | return -1; |
| 153 | } |
| 154 | |
| 155 | |
| 156 | auth_user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD "); |
| 157 | |
| 158 | if (!auth_user) { |
| 159 | rprintf(FERROR,"auth failed on module %s from %s (%s)\n", |
| 160 | name, client_name(fd), client_addr(fd)); |
| 161 | io_printf(fd,"@ERROR: auth failed on module %s\n",name); |
| 162 | return -1; |
| 163 | } |
| 164 | |
| 165 | module_id = i; |
| 166 | |
| 167 | if (lp_read_only(i)) |
| 168 | read_only = 1; |
| 169 | |
| 170 | am_root = (getuid() == 0); |
| 171 | |
| 172 | if (am_root) { |
| 173 | p = lp_uid(i); |
| 174 | if (!name_to_uid(p, &uid)) { |
| 175 | if (!isdigit(*p)) { |
| 176 | rprintf(FERROR,"Invalid uid %s\n", p); |
| 177 | io_printf(fd,"@ERROR: invalid uid\n"); |
| 178 | return -1; |
| 179 | } |
| 180 | uid = atoi(p); |
| 181 | } |
| 182 | |
| 183 | p = lp_gid(i); |
| 184 | if (!name_to_gid(p, &gid)) { |
| 185 | if (!isdigit(*p)) { |
| 186 | rprintf(FERROR,"Invalid gid %s\n", p); |
| 187 | io_printf(fd,"@ERROR: invalid gid\n"); |
| 188 | return -1; |
| 189 | } |
| 190 | gid = atoi(p); |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | p = lp_include_from(i); |
| 195 | add_exclude_file(p, 1, 1); |
| 196 | |
| 197 | p = lp_include(i); |
| 198 | add_include_line(p); |
| 199 | |
| 200 | p = lp_exclude_from(i); |
| 201 | add_exclude_file(p, 1, 0); |
| 202 | |
| 203 | p = lp_exclude(i); |
| 204 | add_exclude_line(p); |
| 205 | |
| 206 | log_open(); |
| 207 | |
| 208 | if (use_chroot) { |
| 209 | if (chroot(lp_path(i))) { |
| 210 | rprintf(FERROR,"chroot %s failed\n", lp_path(i)); |
| 211 | io_printf(fd,"@ERROR: chroot failed\n"); |
| 212 | return -1; |
| 213 | } |
| 214 | |
| 215 | if (!push_dir("/", 0)) { |
| 216 | rprintf(FERROR,"chdir %s failed\n", lp_path(i)); |
| 217 | io_printf(fd,"@ERROR: chdir failed\n"); |
| 218 | return -1; |
| 219 | } |
| 220 | |
| 221 | } else { |
| 222 | if (!push_dir(lp_path(i), 0)) { |
| 223 | rprintf(FERROR,"chdir %s failed\n", lp_path(i)); |
| 224 | io_printf(fd,"@ERROR: chdir failed\n"); |
| 225 | return -1; |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | if (am_root) { |
| 230 | if (setgid(gid)) { |
| 231 | rprintf(FERROR,"setgid %d failed\n", gid); |
| 232 | io_printf(fd,"@ERROR: setgid failed\n"); |
| 233 | return -1; |
| 234 | } |
| 235 | |
| 236 | if (setuid(uid)) { |
| 237 | rprintf(FERROR,"setuid %d failed\n", uid); |
| 238 | io_printf(fd,"@ERROR: setuid failed\n"); |
| 239 | return -1; |
| 240 | } |
| 241 | |
| 242 | am_root = (getuid() == 0); |
| 243 | } |
| 244 | |
| 245 | io_printf(fd,"@RSYNCD: OK\n"); |
| 246 | |
| 247 | argv[argc++] = "rsyncd"; |
| 248 | |
| 249 | while (1) { |
| 250 | if (!read_line(fd, line, sizeof(line)-1)) { |
| 251 | return -1; |
| 252 | } |
| 253 | |
| 254 | if (!*line) break; |
| 255 | |
| 256 | p = line; |
| 257 | |
| 258 | argv[argc] = strdup(p); |
| 259 | if (!argv[argc]) { |
| 260 | return -1; |
| 261 | } |
| 262 | |
| 263 | if (start_glob) { |
| 264 | if (start_glob == 1) { |
| 265 | request = strdup(p); |
| 266 | start_glob++; |
| 267 | } |
| 268 | glob_expand(name, argv, &argc, MAX_ARGS, !use_chroot); |
| 269 | } else { |
| 270 | argc++; |
| 271 | } |
| 272 | |
| 273 | if (strcmp(line,".") == 0) { |
| 274 | start_glob = 1; |
| 275 | } |
| 276 | |
| 277 | if (argc == MAX_ARGS) { |
| 278 | return -1; |
| 279 | } |
| 280 | } |
| 281 | |
| 282 | if (!use_chroot) { |
| 283 | /* |
| 284 | * Note that this is applied to all parameters, whether or not |
| 285 | * they are filenames, but no other legal parameters contain |
| 286 | * the forms that need to be sanitized so it doesn't hurt; |
| 287 | * it is not known at this point which parameters are files |
| 288 | * and which aren't. |
| 289 | */ |
| 290 | for (i = 1; i < argc; i++) { |
| 291 | sanitize_path(argv[i]); |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | ret = parse_arguments(argc, argv); |
| 296 | |
| 297 | if (request) { |
| 298 | if (*auth_user) { |
| 299 | rprintf(FINFO,"rsync %s %s from %s@%s (%s)\n", |
| 300 | am_sender?"on":"to", |
| 301 | request, auth_user, host, addr); |
| 302 | } else { |
| 303 | rprintf(FINFO,"rsync %s %s from %s (%s)\n", |
| 304 | am_sender?"on":"to", |
| 305 | request, host, addr); |
| 306 | } |
| 307 | free(request); |
| 308 | } |
| 309 | |
| 310 | #if !TRIDGE |
| 311 | /* don't allow the logs to be flooded too fast */ |
| 312 | if (verbose > 1) verbose = 1; |
| 313 | #endif |
| 314 | |
| 315 | argc -= optind; |
| 316 | argp = argv + optind; |
| 317 | optind = 0; |
| 318 | |
| 319 | if (remote_version > 17 && am_sender) |
| 320 | io_start_multiplex_out(fd); |
| 321 | |
| 322 | if (!ret) { |
| 323 | option_error(); |
| 324 | } |
| 325 | |
| 326 | if (lp_timeout(i)) { |
| 327 | extern int io_timeout; |
| 328 | io_timeout = lp_timeout(i); |
| 329 | } |
| 330 | |
| 331 | start_server(fd, fd, argc, argp); |
| 332 | |
| 333 | return 0; |
| 334 | } |
| 335 | |
| 336 | /* send a list of available modules to the client. Don't list those |
| 337 | with "list = False". */ |
| 338 | static void send_listing(int fd) |
| 339 | { |
| 340 | int n = lp_numservices(); |
| 341 | int i; |
| 342 | |
| 343 | for (i=0;i<n;i++) |
| 344 | if (lp_list(i)) |
| 345 | io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i)); |
| 346 | } |
| 347 | |
| 348 | /* this is called when a socket connection is established to a client |
| 349 | and we want to start talking. The setup of the system is done from |
| 350 | here */ |
| 351 | static int start_daemon(int fd) |
| 352 | { |
| 353 | char line[200]; |
| 354 | char *motd; |
| 355 | int i = -1; |
| 356 | extern char *config_file; |
| 357 | extern int remote_version; |
| 358 | |
| 359 | if (!lp_load(config_file, 0)) { |
| 360 | exit_cleanup(RERR_SYNTAX); |
| 361 | } |
| 362 | |
| 363 | set_socket_options(fd,"SO_KEEPALIVE"); |
| 364 | set_socket_options(fd,lp_socket_options()); |
| 365 | |
| 366 | |
| 367 | io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION); |
| 368 | |
| 369 | motd = lp_motd_file(); |
| 370 | if (motd && *motd) { |
| 371 | FILE *f = fopen(motd,"r"); |
| 372 | while (f && !feof(f)) { |
| 373 | int len = fread(line, 1, sizeof(line)-1, f); |
| 374 | if (len > 0) { |
| 375 | line[len] = 0; |
| 376 | io_printf(fd,"%s", line); |
| 377 | } |
| 378 | } |
| 379 | if (f) fclose(f); |
| 380 | io_printf(fd,"\n"); |
| 381 | } |
| 382 | |
| 383 | if (!read_line(fd, line, sizeof(line)-1)) { |
| 384 | return -1; |
| 385 | } |
| 386 | |
| 387 | if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) { |
| 388 | io_printf(fd,"@ERROR: protocol startup error\n"); |
| 389 | return -1; |
| 390 | } |
| 391 | |
| 392 | while (i == -1) { |
| 393 | line[0] = 0; |
| 394 | if (!read_line(fd, line, sizeof(line)-1)) { |
| 395 | return -1; |
| 396 | } |
| 397 | |
| 398 | if (!*line || strcmp(line,"#list")==0) { |
| 399 | send_listing(fd); |
| 400 | return -1; |
| 401 | } |
| 402 | |
| 403 | if (*line == '#') { |
| 404 | /* it's some sort of command that I don't understand */ |
| 405 | io_printf(fd,"@ERROR: Unknown command '%s'\n", line); |
| 406 | return -1; |
| 407 | } |
| 408 | |
| 409 | i = lp_number(line); |
| 410 | if (i == -1) { |
| 411 | io_printf(fd,"@ERROR: Unknown module '%s'\n", line); |
| 412 | return -1; |
| 413 | } |
| 414 | } |
| 415 | |
| 416 | return rsync_module(fd, i); |
| 417 | } |
| 418 | |
| 419 | |
| 420 | int daemon_main(void) |
| 421 | { |
| 422 | extern char *config_file; |
| 423 | char *pid_file; |
| 424 | |
| 425 | if (is_a_socket(STDIN_FILENO)) { |
| 426 | int i; |
| 427 | |
| 428 | /* we are running via inetd - close off stdout and |
| 429 | stderr so that library functions (and getopt) don't |
| 430 | try to use them. Redirect them to /dev/null */ |
| 431 | for (i=1;i<3;i++) { |
| 432 | close(i); |
| 433 | open("/dev/null", O_RDWR); |
| 434 | } |
| 435 | |
| 436 | set_nonblocking(STDIN_FILENO); |
| 437 | |
| 438 | return start_daemon(STDIN_FILENO); |
| 439 | } |
| 440 | |
| 441 | become_daemon(); |
| 442 | |
| 443 | if (!lp_load(config_file, 1)) { |
| 444 | fprintf(stderr,"failed to load config file %s\n", config_file); |
| 445 | exit_cleanup(RERR_SYNTAX); |
| 446 | } |
| 447 | |
| 448 | log_open(); |
| 449 | |
| 450 | rprintf(FINFO,"rsyncd version %s starting\n",VERSION); |
| 451 | |
| 452 | if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) { |
| 453 | FILE *f; |
| 454 | int pid = (int) getpid(); |
| 455 | cleanup_set_pid(pid); |
| 456 | if ((f = fopen(lp_pid_file(), "w")) == NULL) { |
| 457 | cleanup_set_pid(0); |
| 458 | fprintf(stderr,"failed to create pid file %s\n", pid_file); |
| 459 | exit_cleanup(RERR_FILEIO); |
| 460 | } |
| 461 | fprintf(f, "%d\n", pid); |
| 462 | fclose(f); |
| 463 | } |
| 464 | |
| 465 | start_accept_loop(rsync_port, start_daemon); |
| 466 | return -1; |
| 467 | } |
| 468 | |