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