Commit | Line | Data |
---|---|---|
3591c066 AT |
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; | |
97cb8dc2 | 27 | char *auth_user; |
cb13abfe | 28 | int sanitize_paths = 0; |
3591c066 AT |
29 | |
30 | int start_socket_client(char *host, char *path, int argc, char *argv[]) | |
31 | { | |
32 | int fd, i; | |
33 | char *sargs[MAX_ARGS]; | |
34 | int sargc=0; | |
e42c9458 | 35 | char line[MAXPATHLEN]; |
bcb7e502 | 36 | char *p, *user=NULL; |
13c5fc0e | 37 | extern int remote_version; |
8d9dc9f9 | 38 | extern int am_sender; |
e30f0657 | 39 | extern struct in_addr socket_address; |
3591c066 | 40 | |
27e3e9c9 AT |
41 | if (argc == 0 && !am_sender) { |
42 | extern int list_only; | |
43 | list_only = 1; | |
44 | } | |
45 | ||
f98df1d9 AT |
46 | if (*path == '/') { |
47 | rprintf(FERROR,"ERROR: The remote path must start with a module name\n"); | |
48 | return -1; | |
49 | } | |
50 | ||
bcb7e502 AT |
51 | p = strchr(host, '@'); |
52 | if (p) { | |
53 | user = host; | |
54 | host = p+1; | |
55 | *p = 0; | |
56 | } | |
57 | ||
58 | if (!user) user = getenv("USER"); | |
59 | if (!user) user = getenv("LOGNAME"); | |
60 | ||
e30f0657 | 61 | fd = open_socket_out(host, rsync_port, &socket_address); |
3591c066 | 62 | if (fd == -1) { |
65417579 | 63 | exit_cleanup(RERR_SOCKETIO); |
3591c066 AT |
64 | } |
65 | ||
66 | server_options(sargs,&sargc); | |
67 | ||
68 | sargs[sargc++] = "."; | |
69 | ||
70 | if (path && *path) | |
71 | sargs[sargc++] = path; | |
72 | ||
73 | sargs[sargc] = NULL; | |
74 | ||
91eee594 AT |
75 | io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION); |
76 | ||
3591c066 AT |
77 | if (!read_line(fd, line, sizeof(line)-1)) { |
78 | return -1; | |
79 | } | |
80 | ||
13c5fc0e | 81 | if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) { |
3591c066 AT |
82 | return -1; |
83 | } | |
84 | ||
2c91d3d3 AT |
85 | p = strchr(path,'/'); |
86 | if (p) *p = 0; | |
87 | io_printf(fd,"%s\n",path); | |
88 | if (p) *p = '/'; | |
89 | ||
3591c066 AT |
90 | while (1) { |
91 | if (!read_line(fd, line, sizeof(line)-1)) { | |
92 | return -1; | |
93 | } | |
31593dd6 | 94 | |
31593dd6 | 95 | if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) { |
bcb7e502 | 96 | auth_client(fd, user, line+18); |
31593dd6 AT |
97 | continue; |
98 | } | |
31593dd6 | 99 | |
3591c066 AT |
100 | if (strcmp(line,"@RSYNCD: OK") == 0) break; |
101 | rprintf(FINFO,"%s\n", line); | |
102 | } | |
103 | ||
104 | for (i=0;i<sargc;i++) { | |
105 | io_printf(fd,"%s\n", sargs[i]); | |
106 | } | |
107 | io_printf(fd,"\n"); | |
108 | ||
09b7f5db AT |
109 | if (remote_version < 23) { |
110 | if (remote_version == 22 || (remote_version > 17 && !am_sender)) | |
111 | io_start_multiplex_in(fd); | |
112 | } | |
8d9dc9f9 | 113 | |
3591c066 AT |
114 | return client_run(fd, fd, -1, argc, argv); |
115 | } | |
116 | ||
117 | ||
118 | ||
119 | static int rsync_module(int fd, int i) | |
120 | { | |
121 | int argc=0; | |
122 | char *argv[MAX_ARGS]; | |
123 | char **argp; | |
e42c9458 | 124 | char line[MAXPATHLEN]; |
1a016bfd AT |
125 | uid_t uid = (uid_t)-2; |
126 | gid_t gid = (gid_t)-2; | |
8ef4ffd6 | 127 | char *p; |
56c473b7 AT |
128 | char *addr = client_addr(fd); |
129 | char *host = client_name(fd); | |
874895d5 | 130 | char *name = lp_name(i); |
8638dd48 | 131 | int use_chroot = lp_use_chroot(i); |
874895d5 | 132 | int start_glob=0; |
41979ff8 | 133 | int ret; |
7b372642 AT |
134 | char *request=NULL; |
135 | extern int am_sender; | |
8d9dc9f9 | 136 | extern int remote_version; |
943882a2 | 137 | extern int am_root; |
56c473b7 AT |
138 | |
139 | if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) { | |
140 | rprintf(FERROR,"rsync denied on module %s from %s (%s)\n", | |
874895d5 | 141 | name, client_name(fd), client_addr(fd)); |
c8e78d87 | 142 | io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n", |
874895d5 | 143 | name, client_name(fd), client_addr(fd)); |
56c473b7 AT |
144 | return -1; |
145 | } | |
3591c066 | 146 | |
5e71c444 | 147 | if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) { |
8d72ef6e AT |
148 | if (errno) { |
149 | rprintf(FERROR,"failed to open lock file %s : %s\n", | |
5e71c444 | 150 | lp_lock_file(i), strerror(errno)); |
8d72ef6e | 151 | io_printf(fd,"@ERROR: failed to open lock file %s : %s\n", |
5e71c444 | 152 | lp_lock_file(i), strerror(errno)); |
8d72ef6e AT |
153 | } else { |
154 | rprintf(FERROR,"max connections (%d) reached\n", | |
5e71c444 AT |
155 | lp_max_connections(i)); |
156 | io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections(i)); | |
8d72ef6e | 157 | } |
0c515f17 AT |
158 | return -1; |
159 | } | |
160 | ||
31593dd6 | 161 | |
97cb8dc2 | 162 | auth_user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD "); |
d0d56395 | 163 | |
97cb8dc2 | 164 | if (!auth_user) { |
d0d56395 AT |
165 | rprintf(FERROR,"auth failed on module %s from %s (%s)\n", |
166 | name, client_name(fd), client_addr(fd)); | |
167 | io_printf(fd,"@ERROR: auth failed on module %s\n",name); | |
168 | return -1; | |
169 | } | |
170 | ||
3591c066 AT |
171 | module_id = i; |
172 | ||
716baed7 | 173 | am_root = (getuid() == 0); |
8ef4ffd6 | 174 | |
716baed7 DD |
175 | if (am_root) { |
176 | p = lp_uid(i); | |
177 | if (!name_to_uid(p, &uid)) { | |
178 | if (!isdigit(*p)) { | |
179 | rprintf(FERROR,"Invalid uid %s\n", p); | |
180 | io_printf(fd,"@ERROR: invalid uid\n"); | |
181 | return -1; | |
182 | } | |
183 | uid = atoi(p); | |
184 | } | |
185 | ||
186 | p = lp_gid(i); | |
187 | if (!name_to_gid(p, &gid)) { | |
188 | if (!isdigit(*p)) { | |
189 | rprintf(FERROR,"Invalid gid %s\n", p); | |
190 | io_printf(fd,"@ERROR: invalid gid\n"); | |
191 | return -1; | |
192 | } | |
193 | gid = atoi(p); | |
194 | } | |
8ef4ffd6 AT |
195 | } |
196 | ||
cd64343a DD |
197 | p = lp_include_from(i); |
198 | add_exclude_file(p, 1, 1); | |
199 | ||
200 | p = lp_include(i); | |
201 | add_include_line(p); | |
202 | ||
8f3a2d54 | 203 | p = lp_exclude_from(i); |
2b6b4d53 | 204 | add_exclude_file(p, 1, 0); |
8f3a2d54 | 205 | |
5805327b | 206 | p = lp_exclude(i); |
8f3a2d54 AT |
207 | add_exclude_line(p); |
208 | ||
1a016bfd AT |
209 | log_open(); |
210 | ||
8638dd48 DD |
211 | if (use_chroot) { |
212 | if (chroot(lp_path(i))) { | |
213 | rprintf(FERROR,"chroot %s failed\n", lp_path(i)); | |
214 | io_printf(fd,"@ERROR: chroot failed\n"); | |
215 | return -1; | |
216 | } | |
3591c066 | 217 | |
c226b7c2 | 218 | if (!push_dir("/", 0)) { |
8638dd48 DD |
219 | rprintf(FERROR,"chdir %s failed\n", lp_path(i)); |
220 | io_printf(fd,"@ERROR: chdir failed\n"); | |
221 | return -1; | |
222 | } | |
3591c066 | 223 | |
716baed7 DD |
224 | } else { |
225 | if (!push_dir(lp_path(i), 0)) { | |
226 | rprintf(FERROR,"chdir %s failed\n", lp_path(i)); | |
227 | io_printf(fd,"@ERROR: chdir failed\n"); | |
228 | return -1; | |
229 | } | |
cb13abfe | 230 | sanitize_paths = 1; |
716baed7 DD |
231 | } |
232 | ||
233 | if (am_root) { | |
234 | if (setgid(gid)) { | |
8638dd48 DD |
235 | rprintf(FERROR,"setgid %d failed\n", gid); |
236 | io_printf(fd,"@ERROR: setgid failed\n"); | |
237 | return -1; | |
238 | } | |
3591c066 | 239 | |
716baed7 | 240 | if (setuid(uid)) { |
8638dd48 DD |
241 | rprintf(FERROR,"setuid %d failed\n", uid); |
242 | io_printf(fd,"@ERROR: setuid failed\n"); | |
243 | return -1; | |
244 | } | |
245 | ||
716baed7 | 246 | am_root = (getuid() == 0); |
3591c066 AT |
247 | } |
248 | ||
249 | io_printf(fd,"@RSYNCD: OK\n"); | |
250 | ||
251 | argv[argc++] = "rsyncd"; | |
252 | ||
253 | while (1) { | |
254 | if (!read_line(fd, line, sizeof(line)-1)) { | |
255 | return -1; | |
256 | } | |
257 | ||
258 | if (!*line) break; | |
259 | ||
874895d5 AT |
260 | p = line; |
261 | ||
874895d5 | 262 | argv[argc] = strdup(p); |
3591c066 AT |
263 | if (!argv[argc]) { |
264 | return -1; | |
265 | } | |
266 | ||
874895d5 | 267 | if (start_glob) { |
1a016bfd | 268 | if (start_glob == 1) { |
7b372642 | 269 | request = strdup(p); |
1a016bfd AT |
270 | start_glob++; |
271 | } | |
cb13abfe | 272 | glob_expand(name, argv, &argc, MAX_ARGS); |
874895d5 AT |
273 | } else { |
274 | argc++; | |
275 | } | |
276 | ||
277 | if (strcmp(line,".") == 0) { | |
278 | start_glob = 1; | |
279 | } | |
280 | ||
3591c066 AT |
281 | if (argc == MAX_ARGS) { |
282 | return -1; | |
283 | } | |
284 | } | |
285 | ||
cb13abfe | 286 | if (sanitize_paths) { |
8638dd48 DD |
287 | /* |
288 | * Note that this is applied to all parameters, whether or not | |
289 | * they are filenames, but no other legal parameters contain | |
290 | * the forms that need to be sanitized so it doesn't hurt; | |
291 | * it is not known at this point which parameters are files | |
292 | * and which aren't. | |
293 | */ | |
294 | for (i = 1; i < argc; i++) { | |
cb13abfe | 295 | sanitize_path(argv[i], NULL); |
8638dd48 DD |
296 | } |
297 | } | |
298 | ||
b86f0cef | 299 | ret = parse_arguments(argc, argv, 0); |
3591c066 | 300 | |
7b372642 | 301 | if (request) { |
97cb8dc2 | 302 | if (*auth_user) { |
d0d56395 AT |
303 | rprintf(FINFO,"rsync %s %s from %s@%s (%s)\n", |
304 | am_sender?"on":"to", | |
97cb8dc2 | 305 | request, auth_user, host, addr); |
d0d56395 AT |
306 | } else { |
307 | rprintf(FINFO,"rsync %s %s from %s (%s)\n", | |
308 | am_sender?"on":"to", | |
309 | request, host, addr); | |
310 | } | |
7b372642 AT |
311 | free(request); |
312 | } | |
313 | ||
0199b05f | 314 | #if !TRIDGE |
3591c066 AT |
315 | /* don't allow the logs to be flooded too fast */ |
316 | if (verbose > 1) verbose = 1; | |
0199b05f | 317 | #endif |
3591c066 AT |
318 | |
319 | argc -= optind; | |
320 | argp = argv + optind; | |
321 | optind = 0; | |
322 | ||
09b7f5db AT |
323 | if (remote_version < 23) { |
324 | if (remote_version == 22 || (remote_version > 17 && am_sender)) | |
325 | io_start_multiplex_out(fd); | |
554e0a8d AT |
326 | } |
327 | ||
41979ff8 | 328 | if (!ret) { |
cd8185f2 | 329 | option_error(); |
41979ff8 AT |
330 | } |
331 | ||
81791cfc AT |
332 | if (lp_timeout(i)) { |
333 | extern int io_timeout; | |
334 | io_timeout = lp_timeout(i); | |
335 | } | |
336 | ||
3591c066 AT |
337 | start_server(fd, fd, argc, argp); |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
7a6421fa AT |
342 | /* send a list of available modules to the client. Don't list those |
343 | with "list = False". */ | |
3591c066 AT |
344 | static void send_listing(int fd) |
345 | { | |
346 | int n = lp_numservices(); | |
347 | int i; | |
348 | ||
349 | for (i=0;i<n;i++) | |
350 | if (lp_list(i)) | |
351 | io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i)); | |
352 | } | |
353 | ||
354 | /* this is called when a socket connection is established to a client | |
355 | and we want to start talking. The setup of the system is done from | |
356 | here */ | |
357 | static int start_daemon(int fd) | |
358 | { | |
7a6421fa | 359 | char line[200]; |
3591c066 | 360 | char *motd; |
8ef4ffd6 | 361 | int i = -1; |
4cdf25e4 | 362 | extern char *config_file; |
13c5fc0e | 363 | extern int remote_version; |
4cdf25e4 | 364 | |
f9e940ef | 365 | if (!lp_load(config_file, 0)) { |
65417579 | 366 | exit_cleanup(RERR_SYNTAX); |
4cdf25e4 | 367 | } |
3591c066 AT |
368 | |
369 | set_socket_options(fd,"SO_KEEPALIVE"); | |
a6801c39 | 370 | set_socket_options(fd,lp_socket_options()); |
f0359dd0 | 371 | set_nonblocking(fd); |
3591c066 AT |
372 | |
373 | io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION); | |
374 | ||
375 | motd = lp_motd_file(); | |
27d3cdbc | 376 | if (motd && *motd) { |
3591c066 AT |
377 | FILE *f = fopen(motd,"r"); |
378 | while (f && !feof(f)) { | |
379 | int len = fread(line, 1, sizeof(line)-1, f); | |
380 | if (len > 0) { | |
381 | line[len] = 0; | |
382 | io_printf(fd,"%s", line); | |
383 | } | |
384 | } | |
385 | if (f) fclose(f); | |
386 | io_printf(fd,"\n"); | |
387 | } | |
388 | ||
91eee594 AT |
389 | if (!read_line(fd, line, sizeof(line)-1)) { |
390 | return -1; | |
391 | } | |
392 | ||
393 | if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) { | |
c8e78d87 | 394 | io_printf(fd,"@ERROR: protocol startup error\n"); |
91eee594 AT |
395 | return -1; |
396 | } | |
397 | ||
8ef4ffd6 | 398 | while (i == -1) { |
3591c066 AT |
399 | line[0] = 0; |
400 | if (!read_line(fd, line, sizeof(line)-1)) { | |
401 | return -1; | |
402 | } | |
403 | ||
404 | if (!*line || strcmp(line,"#list")==0) { | |
405 | send_listing(fd); | |
406 | return -1; | |
407 | } | |
408 | ||
409 | if (*line == '#') { | |
410 | /* it's some sort of command that I don't understand */ | |
c8e78d87 | 411 | io_printf(fd,"@ERROR: Unknown command '%s'\n", line); |
3591c066 AT |
412 | return -1; |
413 | } | |
414 | ||
415 | i = lp_number(line); | |
416 | if (i == -1) { | |
c8e78d87 | 417 | io_printf(fd,"@ERROR: Unknown module '%s'\n", line); |
3591c066 AT |
418 | return -1; |
419 | } | |
3591c066 AT |
420 | } |
421 | ||
8ef4ffd6 | 422 | return rsync_module(fd, i); |
3591c066 AT |
423 | } |
424 | ||
425 | ||
426 | int daemon_main(void) | |
427 | { | |
f9e940ef | 428 | extern char *config_file; |
ad517ce5 | 429 | extern int orig_umask; |
8638dd48 | 430 | char *pid_file; |
1a016bfd | 431 | |
3591c066 | 432 | if (is_a_socket(STDIN_FILENO)) { |
41979ff8 AT |
433 | int i; |
434 | ||
435 | /* we are running via inetd - close off stdout and | |
436 | stderr so that library functions (and getopt) don't | |
437 | try to use them. Redirect them to /dev/null */ | |
438 | for (i=1;i<3;i++) { | |
439 | close(i); | |
440 | open("/dev/null", O_RDWR); | |
441 | } | |
3eb38818 | 442 | |
3591c066 AT |
443 | return start_daemon(STDIN_FILENO); |
444 | } | |
445 | ||
446 | become_daemon(); | |
447 | ||
f9e940ef | 448 | if (!lp_load(config_file, 1)) { |
65417579 | 449 | exit_cleanup(RERR_SYNTAX); |
f9e940ef AT |
450 | } |
451 | ||
452 | log_open(); | |
453 | ||
e42c9458 AT |
454 | rprintf(FINFO,"rsyncd version %s starting\n",VERSION); |
455 | ||
8638dd48 | 456 | if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) { |
ad517ce5 DD |
457 | char pidbuf[16]; |
458 | int fd; | |
8638dd48 DD |
459 | int pid = (int) getpid(); |
460 | cleanup_set_pid(pid); | |
ad517ce5 DD |
461 | if ((fd = do_open(lp_pid_file(), O_WRONLY|O_CREAT|O_TRUNC, |
462 | 0666 & ~orig_umask)) == -1) { | |
8638dd48 | 463 | cleanup_set_pid(0); |
8a5d6bba | 464 | rprintf(FLOG,"failed to create pid file %s\n", pid_file); |
65417579 | 465 | exit_cleanup(RERR_FILEIO); |
8638dd48 | 466 | } |
ad517ce5 DD |
467 | slprintf(pidbuf, sizeof(pidbuf), "%d\n", pid); |
468 | write(fd, pidbuf, strlen(pidbuf)); | |
469 | close(fd); | |
8638dd48 DD |
470 | } |
471 | ||
8ef4ffd6 AT |
472 | start_accept_loop(rsync_port, start_daemon); |
473 | return -1; | |
3591c066 AT |
474 | } |
475 |