Commit | Line | Data |
---|---|---|
a039749b MP |
1 | /* -*- c-file-style: "linux"; -*- |
2 | ||
15b7b73d MP |
3 | Copyright (C) 1998-2001 by Andrew Tridgell <tridge@samba.org> |
4 | Copyright (C) 2001 by Martin Pool <mbp@samba.org> | |
3591c066 AT |
5 | |
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
20 | ||
bc363ea9 | 21 | /* the socket based protocol for setting up a connection with rsyncd */ |
3591c066 AT |
22 | |
23 | #include "rsync.h" | |
24 | ||
25 | extern int module_id; | |
26 | extern int read_only; | |
27 | extern int verbose; | |
28 | extern int rsync_port; | |
97cb8dc2 | 29 | char *auth_user; |
cb13abfe | 30 | int sanitize_paths = 0; |
3591c066 | 31 | |
bc363ea9 MP |
32 | /* |
33 | * Run a client connected to an rsyncd. The alternative to this | |
34 | * function for remote-shell connections is do_cmd. | |
35 | */ | |
3591c066 AT |
36 | int start_socket_client(char *host, char *path, int argc, char *argv[]) |
37 | { | |
38 | int fd, i; | |
39 | char *sargs[MAX_ARGS]; | |
40 | int sargc=0; | |
e42c9458 | 41 | char line[MAXPATHLEN]; |
bcb7e502 | 42 | char *p, *user=NULL; |
13c5fc0e | 43 | extern int remote_version; |
8d9dc9f9 | 44 | extern int am_sender; |
e30f0657 | 45 | extern struct in_addr socket_address; |
bc363ea9 | 46 | extern char *shell_cmd; |
7a55d06e MP |
47 | extern int kludge_around_eof; |
48 | ||
27e3e9c9 AT |
49 | if (argc == 0 && !am_sender) { |
50 | extern int list_only; | |
51 | list_only = 1; | |
52 | } | |
53 | ||
bc363ea9 MP |
54 | /* This is just a friendliness enhancement: if the connection |
55 | * is to an rsyncd then there is no point specifying the -e option. | |
56 | * Note that this is only set if the -e was explicitly specified, | |
57 | * not if the environment variable just happens to be set. | |
58 | * See http://lists.samba.org/pipermail/rsync/2000-September/002744.html | |
59 | */ | |
60 | if (shell_cmd) { | |
61 | rprintf(FERROR, "WARNING: --rsh or -e option ignored when " | |
62 | "connecting to rsync daemon\n"); | |
63 | /* continue */ | |
64 | } | |
65 | ||
f98df1d9 | 66 | if (*path == '/') { |
ff81e809 | 67 | rprintf(FERROR,"ERROR: The remote path must start with a module name not a /\n"); |
f98df1d9 AT |
68 | return -1; |
69 | } | |
70 | ||
bcb7e502 AT |
71 | p = strchr(host, '@'); |
72 | if (p) { | |
73 | user = host; | |
74 | host = p+1; | |
75 | *p = 0; | |
76 | } | |
77 | ||
78 | if (!user) user = getenv("USER"); | |
79 | if (!user) user = getenv("LOGNAME"); | |
80 | ||
eecd22ff | 81 | fd = open_socket_out_wrapped (host, rsync_port, &socket_address); |
3591c066 | 82 | if (fd == -1) { |
65417579 | 83 | exit_cleanup(RERR_SOCKETIO); |
3591c066 AT |
84 | } |
85 | ||
86 | server_options(sargs,&sargc); | |
87 | ||
88 | sargs[sargc++] = "."; | |
89 | ||
90 | if (path && *path) | |
91 | sargs[sargc++] = path; | |
92 | ||
93 | sargs[sargc] = NULL; | |
94 | ||
91eee594 AT |
95 | io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION); |
96 | ||
3591c066 AT |
97 | if (!read_line(fd, line, sizeof(line)-1)) { |
98 | return -1; | |
99 | } | |
100 | ||
13c5fc0e | 101 | if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) { |
3591c066 AT |
102 | return -1; |
103 | } | |
104 | ||
2c91d3d3 AT |
105 | p = strchr(path,'/'); |
106 | if (p) *p = 0; | |
107 | io_printf(fd,"%s\n",path); | |
108 | if (p) *p = '/'; | |
109 | ||
063393d6 MP |
110 | /* Old servers may just drop the connection here, |
111 | rather than sending a proper EXIT command. Yuck. */ | |
112 | kludge_around_eof = remote_version < 25; | |
7a55d06e | 113 | |
063393d6 | 114 | while (1) { |
3591c066 AT |
115 | if (!read_line(fd, line, sizeof(line)-1)) { |
116 | return -1; | |
117 | } | |
31593dd6 | 118 | |
31593dd6 | 119 | if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) { |
bcb7e502 | 120 | auth_client(fd, user, line+18); |
31593dd6 AT |
121 | continue; |
122 | } | |
31593dd6 | 123 | |
3591c066 | 124 | if (strcmp(line,"@RSYNCD: OK") == 0) break; |
8f04bb36 AT |
125 | |
126 | if (strcmp(line,"@RSYNCD: EXIT") == 0) exit(0); | |
127 | ||
3591c066 AT |
128 | rprintf(FINFO,"%s\n", line); |
129 | } | |
7a55d06e | 130 | kludge_around_eof = False; |
3591c066 AT |
131 | |
132 | for (i=0;i<sargc;i++) { | |
133 | io_printf(fd,"%s\n", sargs[i]); | |
134 | } | |
135 | io_printf(fd,"\n"); | |
136 | ||
09b7f5db AT |
137 | if (remote_version < 23) { |
138 | if (remote_version == 22 || (remote_version > 17 && !am_sender)) | |
139 | io_start_multiplex_in(fd); | |
140 | } | |
8d9dc9f9 | 141 | |
3591c066 AT |
142 | return client_run(fd, fd, -1, argc, argv); |
143 | } | |
144 | ||
145 | ||
146 | ||
147 | static int rsync_module(int fd, int i) | |
148 | { | |
149 | int argc=0; | |
150 | char *argv[MAX_ARGS]; | |
151 | char **argp; | |
e42c9458 | 152 | char line[MAXPATHLEN]; |
2af27ad9 | 153 | uid_t uid = (uid_t)-2; /* canonically "nobody" */ |
1a016bfd | 154 | gid_t gid = (gid_t)-2; |
8ef4ffd6 | 155 | char *p; |
56c473b7 AT |
156 | char *addr = client_addr(fd); |
157 | char *host = client_name(fd); | |
874895d5 | 158 | char *name = lp_name(i); |
8638dd48 | 159 | int use_chroot = lp_use_chroot(i); |
874895d5 | 160 | int start_glob=0; |
41979ff8 | 161 | int ret; |
7b372642 AT |
162 | char *request=NULL; |
163 | extern int am_sender; | |
8d9dc9f9 | 164 | extern int remote_version; |
943882a2 | 165 | extern int am_root; |
56c473b7 AT |
166 | |
167 | if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) { | |
168 | rprintf(FERROR,"rsync denied on module %s from %s (%s)\n", | |
874895d5 | 169 | name, client_name(fd), client_addr(fd)); |
c8e78d87 | 170 | io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n", |
874895d5 | 171 | name, client_name(fd), client_addr(fd)); |
56c473b7 AT |
172 | return -1; |
173 | } | |
3591c066 | 174 | |
5e71c444 | 175 | if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) { |
8d72ef6e AT |
176 | if (errno) { |
177 | rprintf(FERROR,"failed to open lock file %s : %s\n", | |
5e71c444 | 178 | lp_lock_file(i), strerror(errno)); |
8d72ef6e | 179 | io_printf(fd,"@ERROR: failed to open lock file %s : %s\n", |
5e71c444 | 180 | lp_lock_file(i), strerror(errno)); |
8d72ef6e AT |
181 | } else { |
182 | rprintf(FERROR,"max connections (%d) reached\n", | |
5e71c444 AT |
183 | lp_max_connections(i)); |
184 | io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections(i)); | |
8d72ef6e | 185 | } |
0c515f17 AT |
186 | return -1; |
187 | } | |
188 | ||
31593dd6 | 189 | |
97cb8dc2 | 190 | auth_user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD "); |
d0d56395 | 191 | |
97cb8dc2 | 192 | if (!auth_user) { |
d0d56395 AT |
193 | rprintf(FERROR,"auth failed on module %s from %s (%s)\n", |
194 | name, client_name(fd), client_addr(fd)); | |
195 | io_printf(fd,"@ERROR: auth failed on module %s\n",name); | |
196 | return -1; | |
197 | } | |
198 | ||
3591c066 AT |
199 | module_id = i; |
200 | ||
716baed7 | 201 | am_root = (getuid() == 0); |
8ef4ffd6 | 202 | |
716baed7 DD |
203 | if (am_root) { |
204 | p = lp_uid(i); | |
205 | if (!name_to_uid(p, &uid)) { | |
206 | if (!isdigit(*p)) { | |
207 | rprintf(FERROR,"Invalid uid %s\n", p); | |
fd2dd2aa | 208 | io_printf(fd,"@ERROR: invalid uid %s\n", p); |
716baed7 DD |
209 | return -1; |
210 | } | |
211 | uid = atoi(p); | |
212 | } | |
213 | ||
214 | p = lp_gid(i); | |
215 | if (!name_to_gid(p, &gid)) { | |
216 | if (!isdigit(*p)) { | |
217 | rprintf(FERROR,"Invalid gid %s\n", p); | |
fd2dd2aa | 218 | io_printf(fd,"@ERROR: invalid gid %s\n", p); |
716baed7 DD |
219 | return -1; |
220 | } | |
221 | gid = atoi(p); | |
222 | } | |
8ef4ffd6 | 223 | } |
3b2b5345 MP |
224 | |
225 | /* TODO: If we're not root, but the configuration requests | |
226 | * that we change to some uid other than the current one, then | |
227 | * log a warning. */ | |
228 | ||
229 | /* TODO: Perhaps take a list of gids, and make them into the | |
230 | * supplementary groups. */ | |
8ef4ffd6 | 231 | |
cd64343a DD |
232 | p = lp_include_from(i); |
233 | add_exclude_file(p, 1, 1); | |
234 | ||
235 | p = lp_include(i); | |
236 | add_include_line(p); | |
237 | ||
8f3a2d54 | 238 | p = lp_exclude_from(i); |
2b6b4d53 | 239 | add_exclude_file(p, 1, 0); |
8f3a2d54 | 240 | |
5805327b | 241 | p = lp_exclude(i); |
8f3a2d54 AT |
242 | add_exclude_line(p); |
243 | ||
45a83540 | 244 | log_init(); |
1a016bfd | 245 | |
8638dd48 DD |
246 | if (use_chroot) { |
247 | if (chroot(lp_path(i))) { | |
a039749b | 248 | rsyserr(FERROR, errno, "chroot %s failed", lp_path(i)); |
8638dd48 DD |
249 | io_printf(fd,"@ERROR: chroot failed\n"); |
250 | return -1; | |
251 | } | |
3591c066 | 252 | |
c226b7c2 | 253 | if (!push_dir("/", 0)) { |
a039749b | 254 | rsyserr(FERROR, errno, "chdir %s failed\n", lp_path(i)); |
8638dd48 DD |
255 | io_printf(fd,"@ERROR: chdir failed\n"); |
256 | return -1; | |
257 | } | |
3591c066 | 258 | |
716baed7 DD |
259 | } else { |
260 | if (!push_dir(lp_path(i), 0)) { | |
a039749b | 261 | rsyserr(FERROR, errno, "chdir %s failed\n", lp_path(i)); |
716baed7 DD |
262 | io_printf(fd,"@ERROR: chdir failed\n"); |
263 | return -1; | |
264 | } | |
cb13abfe | 265 | sanitize_paths = 1; |
716baed7 DD |
266 | } |
267 | ||
268 | if (am_root) { | |
269 | if (setgid(gid)) { | |
08a740ff | 270 | rsyserr(FERROR, errno, "setgid %d failed", (int) gid); |
8638dd48 DD |
271 | io_printf(fd,"@ERROR: setgid failed\n"); |
272 | return -1; | |
273 | } | |
3591c066 | 274 | |
716baed7 | 275 | if (setuid(uid)) { |
08a740ff | 276 | rsyserr(FERROR, errno, "setuid %d failed", (int) uid); |
8638dd48 DD |
277 | io_printf(fd,"@ERROR: setuid failed\n"); |
278 | return -1; | |
279 | } | |
280 | ||
716baed7 | 281 | am_root = (getuid() == 0); |
3591c066 AT |
282 | } |
283 | ||
284 | io_printf(fd,"@RSYNCD: OK\n"); | |
285 | ||
286 | argv[argc++] = "rsyncd"; | |
287 | ||
288 | while (1) { | |
289 | if (!read_line(fd, line, sizeof(line)-1)) { | |
290 | return -1; | |
291 | } | |
292 | ||
293 | if (!*line) break; | |
294 | ||
874895d5 AT |
295 | p = line; |
296 | ||
874895d5 | 297 | argv[argc] = strdup(p); |
3591c066 AT |
298 | if (!argv[argc]) { |
299 | return -1; | |
300 | } | |
301 | ||
874895d5 | 302 | if (start_glob) { |
1a016bfd | 303 | if (start_glob == 1) { |
7b372642 | 304 | request = strdup(p); |
1a016bfd AT |
305 | start_glob++; |
306 | } | |
cb13abfe | 307 | glob_expand(name, argv, &argc, MAX_ARGS); |
874895d5 AT |
308 | } else { |
309 | argc++; | |
310 | } | |
311 | ||
312 | if (strcmp(line,".") == 0) { | |
313 | start_glob = 1; | |
314 | } | |
315 | ||
3591c066 AT |
316 | if (argc == MAX_ARGS) { |
317 | return -1; | |
318 | } | |
319 | } | |
320 | ||
cb13abfe | 321 | if (sanitize_paths) { |
8638dd48 DD |
322 | /* |
323 | * Note that this is applied to all parameters, whether or not | |
324 | * they are filenames, but no other legal parameters contain | |
325 | * the forms that need to be sanitized so it doesn't hurt; | |
326 | * it is not known at this point which parameters are files | |
327 | * and which aren't. | |
328 | */ | |
329 | for (i = 1; i < argc; i++) { | |
cb13abfe | 330 | sanitize_path(argv[i], NULL); |
8638dd48 DD |
331 | } |
332 | } | |
333 | ||
15b7b73d MP |
334 | argp = argv; |
335 | ret = parse_arguments(&argc, (const char ***) &argp, 0); | |
3591c066 | 336 | |
7b372642 | 337 | if (request) { |
97cb8dc2 | 338 | if (*auth_user) { |
d0d56395 AT |
339 | rprintf(FINFO,"rsync %s %s from %s@%s (%s)\n", |
340 | am_sender?"on":"to", | |
97cb8dc2 | 341 | request, auth_user, host, addr); |
d0d56395 AT |
342 | } else { |
343 | rprintf(FINFO,"rsync %s %s from %s (%s)\n", | |
344 | am_sender?"on":"to", | |
345 | request, host, addr); | |
346 | } | |
7b372642 AT |
347 | free(request); |
348 | } | |
349 | ||
15b7b73d | 350 | #ifndef DEBUG |
3591c066 AT |
351 | /* don't allow the logs to be flooded too fast */ |
352 | if (verbose > 1) verbose = 1; | |
0199b05f | 353 | #endif |
3591c066 | 354 | |
09b7f5db AT |
355 | if (remote_version < 23) { |
356 | if (remote_version == 22 || (remote_version > 17 && am_sender)) | |
357 | io_start_multiplex_out(fd); | |
554e0a8d | 358 | } |
15b7b73d MP |
359 | |
360 | /* For later protocol versions, we don't start multiplexing | |
361 | * until we've configured nonblocking in start_server. That | |
362 | * means we're in a sticky situation now: there's no way to | |
363 | * convey errors to the client. */ | |
364 | ||
365 | /* FIXME: Hold off on reporting option processing errors until | |
366 | * we've set up nonblocking and multiplexed IO and can get the | |
367 | * message back to them. */ | |
41979ff8 | 368 | if (!ret) { |
15b7b73d MP |
369 | option_error(); |
370 | exit_cleanup(RERR_UNSUPPORTED); | |
41979ff8 AT |
371 | } |
372 | ||
81791cfc AT |
373 | if (lp_timeout(i)) { |
374 | extern int io_timeout; | |
375 | io_timeout = lp_timeout(i); | |
376 | } | |
377 | ||
3591c066 AT |
378 | start_server(fd, fd, argc, argp); |
379 | ||
380 | return 0; | |
381 | } | |
382 | ||
7a6421fa AT |
383 | /* send a list of available modules to the client. Don't list those |
384 | with "list = False". */ | |
3591c066 AT |
385 | static void send_listing(int fd) |
386 | { | |
387 | int n = lp_numservices(); | |
388 | int i; | |
063393d6 MP |
389 | extern int remote_version; |
390 | ||
3591c066 AT |
391 | for (i=0;i<n;i++) |
392 | if (lp_list(i)) | |
393 | io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i)); | |
8f04bb36 | 394 | |
063393d6 MP |
395 | if (remote_version >= 25) |
396 | io_printf(fd,"@RSYNCD: EXIT\n"); | |
3591c066 AT |
397 | } |
398 | ||
399 | /* this is called when a socket connection is established to a client | |
400 | and we want to start talking. The setup of the system is done from | |
401 | here */ | |
402 | static int start_daemon(int fd) | |
403 | { | |
7a6421fa | 404 | char line[200]; |
3591c066 | 405 | char *motd; |
8ef4ffd6 | 406 | int i = -1; |
4cdf25e4 | 407 | extern char *config_file; |
13c5fc0e | 408 | extern int remote_version; |
4cdf25e4 | 409 | |
f9e940ef | 410 | if (!lp_load(config_file, 0)) { |
65417579 | 411 | exit_cleanup(RERR_SYNTAX); |
4cdf25e4 | 412 | } |
3591c066 AT |
413 | |
414 | set_socket_options(fd,"SO_KEEPALIVE"); | |
a6801c39 | 415 | set_socket_options(fd,lp_socket_options()); |
f0359dd0 | 416 | set_nonblocking(fd); |
3591c066 AT |
417 | |
418 | io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION); | |
419 | ||
420 | motd = lp_motd_file(); | |
27d3cdbc | 421 | if (motd && *motd) { |
3591c066 AT |
422 | FILE *f = fopen(motd,"r"); |
423 | while (f && !feof(f)) { | |
424 | int len = fread(line, 1, sizeof(line)-1, f); | |
425 | if (len > 0) { | |
426 | line[len] = 0; | |
427 | io_printf(fd,"%s", line); | |
428 | } | |
429 | } | |
430 | if (f) fclose(f); | |
431 | io_printf(fd,"\n"); | |
432 | } | |
433 | ||
91eee594 AT |
434 | if (!read_line(fd, line, sizeof(line)-1)) { |
435 | return -1; | |
436 | } | |
437 | ||
438 | if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) { | |
c8e78d87 | 439 | io_printf(fd,"@ERROR: protocol startup error\n"); |
91eee594 AT |
440 | return -1; |
441 | } | |
442 | ||
8ef4ffd6 | 443 | while (i == -1) { |
3591c066 AT |
444 | line[0] = 0; |
445 | if (!read_line(fd, line, sizeof(line)-1)) { | |
446 | return -1; | |
447 | } | |
448 | ||
449 | if (!*line || strcmp(line,"#list")==0) { | |
450 | send_listing(fd); | |
451 | return -1; | |
452 | } | |
453 | ||
454 | if (*line == '#') { | |
455 | /* it's some sort of command that I don't understand */ | |
c8e78d87 | 456 | io_printf(fd,"@ERROR: Unknown command '%s'\n", line); |
3591c066 AT |
457 | return -1; |
458 | } | |
459 | ||
460 | i = lp_number(line); | |
461 | if (i == -1) { | |
c8e78d87 | 462 | io_printf(fd,"@ERROR: Unknown module '%s'\n", line); |
3591c066 AT |
463 | return -1; |
464 | } | |
3591c066 AT |
465 | } |
466 | ||
8ef4ffd6 | 467 | return rsync_module(fd, i); |
3591c066 AT |
468 | } |
469 | ||
470 | ||
471 | int daemon_main(void) | |
472 | { | |
f9e940ef | 473 | extern char *config_file; |
ad517ce5 | 474 | extern int orig_umask; |
8638dd48 | 475 | char *pid_file; |
1a016bfd | 476 | |
3591c066 | 477 | if (is_a_socket(STDIN_FILENO)) { |
41979ff8 AT |
478 | int i; |
479 | ||
480 | /* we are running via inetd - close off stdout and | |
481 | stderr so that library functions (and getopt) don't | |
482 | try to use them. Redirect them to /dev/null */ | |
483 | for (i=1;i<3;i++) { | |
484 | close(i); | |
485 | open("/dev/null", O_RDWR); | |
486 | } | |
3eb38818 | 487 | |
3591c066 AT |
488 | return start_daemon(STDIN_FILENO); |
489 | } | |
490 | ||
491 | become_daemon(); | |
492 | ||
f9e940ef | 493 | if (!lp_load(config_file, 1)) { |
65417579 | 494 | exit_cleanup(RERR_SYNTAX); |
f9e940ef AT |
495 | } |
496 | ||
45a83540 | 497 | log_init(); |
f9e940ef | 498 | |
15b7b73d MP |
499 | rprintf(FINFO, "rsyncd version %s starting, listening on port %d\n", VERSION, |
500 | rsync_port); | |
501 | /* TODO: If listening on a particular address, then show that | |
502 | * address too. */ | |
e42c9458 | 503 | |
8638dd48 | 504 | if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) { |
ad517ce5 DD |
505 | char pidbuf[16]; |
506 | int fd; | |
8638dd48 DD |
507 | int pid = (int) getpid(); |
508 | cleanup_set_pid(pid); | |
ad517ce5 DD |
509 | if ((fd = do_open(lp_pid_file(), O_WRONLY|O_CREAT|O_TRUNC, |
510 | 0666 & ~orig_umask)) == -1) { | |
8638dd48 | 511 | cleanup_set_pid(0); |
a039749b | 512 | rsyserr(FLOG, errno, "failed to create pid file %s", pid_file); |
65417579 | 513 | exit_cleanup(RERR_FILEIO); |
8638dd48 | 514 | } |
8950ac03 | 515 | snprintf(pidbuf, sizeof(pidbuf), "%d\n", pid); |
ad517ce5 DD |
516 | write(fd, pidbuf, strlen(pidbuf)); |
517 | close(fd); | |
8638dd48 DD |
518 | } |
519 | ||
8ef4ffd6 AT |
520 | start_accept_loop(rsync_port, start_daemon); |
521 | return -1; | |
3591c066 AT |
522 | } |
523 |