forked from RsyncProject/rsync
-
Notifications
You must be signed in to change notification settings - Fork 0
/
clientserver.c
1461 lines (1274 loc) · 38.1 KB
/
clientserver.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* The socket based protocol for setting up a connection with rsyncd.
*
* Copyright (C) 1998-2001 Andrew Tridgell <[email protected]>
* Copyright (C) 2001-2002 Martin Pool <[email protected]>
* Copyright (C) 2002-2020 Wayne Davison
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, visit the http://fsf.org website.
*/
#include "rsync.h"
#include "itypes.h"
#include "ifuncs.h"
extern int quiet;
extern int dry_run;
extern int output_motd;
extern int list_only;
extern int am_sender;
extern int am_server;
extern int am_daemon;
extern int am_root;
extern int msgs2stderr;
extern int rsync_port;
extern int protect_args;
extern int ignore_errors;
extern int preserve_xattrs;
extern int kluge_around_eof;
extern int munge_symlinks;
extern int open_noatime;
extern int sanitize_paths;
extern int numeric_ids;
extern int filesfrom_fd;
extern int remote_protocol;
extern int protocol_version;
extern int io_timeout;
extern int no_detach;
extern int write_batch;
extern int default_af_hint;
extern int logfile_format_has_i;
extern int logfile_format_has_o_or_i;
extern char *bind_address;
extern char *config_file;
extern char *logfile_format;
extern char *files_from;
extern char *tmpdir;
extern char *early_input_file;
extern struct chmod_mode_struct *chmod_modes;
extern filter_rule_list daemon_filter_list;
#ifdef ICONV_OPTION
extern char *iconv_opt;
extern iconv_t ic_send, ic_recv;
#endif
extern uid_t our_uid;
extern gid_t our_gid;
char *auth_user;
int read_only = 0;
int module_id = -1;
int pid_file_fd = -1;
int early_input_len = 0;
char *early_input = NULL;
pid_t namecvt_pid = 0;
struct chmod_mode_struct *daemon_chmod_modes;
#define EARLY_INPUT_CMD "#early_input="
#define EARLY_INPUT_CMDLEN (sizeof EARLY_INPUT_CMD - 1)
/* module_dirlen is the length of the module_dir string when in daemon
* mode and module_dir is not "/"; otherwise 0. (Note that a chroot-
* enabled module can have a non-"/" module_dir these days.) */
char *module_dir = NULL;
unsigned int module_dirlen = 0;
char *full_module_path;
static int rl_nulls = 0;
static int namecvt_fd_req = -1, namecvt_fd_ans = -1;
#ifdef HAVE_SIGACTION
static struct sigaction sigact;
#endif
static item_list gid_list = EMPTY_ITEM_LIST;
/* Used when "reverse lookup" is off. */
const char undetermined_hostname[] = "UNDETERMINED";
/**
* Run a client connected to an rsyncd. The alternative to this
* function for remote-shell connections is do_cmd().
*
* After negotiating which module to use and reading the server's
* motd, this hands over to client_run(). Telling the server the
* module will cause it to chroot/setuid/etc.
*
* Instead of doing a transfer, the client may at this stage instead
* get a listing of remote modules and exit.
*
* @return -1 for error in startup, or the result of client_run().
* Either way, it eventually gets passed to exit_cleanup().
**/
int start_socket_client(char *host, int remote_argc, char *remote_argv[],
int argc, char *argv[])
{
int fd, ret;
char *p, *user = NULL;
/* This is redundant with code in start_inband_exchange(), but this
* short-circuits a problem in the client before we open a socket,
* and the extra check won't hurt. */
if (**remote_argv == '/') {
rprintf(FERROR,
"ERROR: The remote path must start with a module name not a /\n");
return -1;
}
if ((p = strrchr(host, '@')) != NULL) {
user = host;
host = p+1;
*p = '\0';
}
fd = open_socket_out_wrapped(host, rsync_port, bind_address, default_af_hint);
if (fd == -1)
exit_cleanup(RERR_SOCKETIO);
#ifdef ICONV_CONST
setup_iconv();
#endif
ret = start_inband_exchange(fd, fd, user, remote_argc, remote_argv);
return ret ? ret : client_run(fd, fd, -1, argc, argv);
}
static int exchange_protocols(int f_in, int f_out, char *buf, size_t bufsiz, int am_client)
{
int remote_sub = -1;
#if SUBPROTOCOL_VERSION != 0
int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
#else
int our_sub = 0;
#endif
io_printf(f_out, "@RSYNCD: %d.%d\n", protocol_version, our_sub);
if (!am_client) {
char *motd = lp_motd_file();
if (motd && *motd) {
FILE *f = fopen(motd, "r");
while (f && !feof(f)) {
int len = fread(buf, 1, bufsiz - 1, f);
if (len > 0)
write_buf(f_out, buf, len);
}
if (f)
fclose(f);
write_sbuf(f_out, "\n");
}
}
/* This strips the \n. */
if (!read_line_old(f_in, buf, bufsiz, 0)) {
if (am_client)
rprintf(FERROR, "rsync: did not see server greeting\n");
return -1;
}
if (sscanf(buf, "@RSYNCD: %d.%d", &remote_protocol, &remote_sub) < 1) {
if (am_client)
rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n", buf);
else
io_printf(f_out, "@ERROR: protocol startup error\n");
return -1;
}
if (remote_sub < 0) {
if (remote_protocol == 30) {
if (am_client)
rprintf(FERROR, "rsync: server is speaking an incompatible beta of protocol 30\n");
else
io_printf(f_out, "@ERROR: your client is speaking an incompatible beta of protocol 30\n");
return -1;
}
remote_sub = 0;
}
if (protocol_version > remote_protocol) {
protocol_version = remote_protocol;
if (remote_sub)
protocol_version--;
} else if (protocol_version == remote_protocol) {
if (remote_sub != our_sub)
protocol_version--;
}
#if SUBPROTOCOL_VERSION != 0
else if (protocol_version < remote_protocol) {
if (our_sub)
protocol_version--;
}
#endif
if (protocol_version >= 30)
rl_nulls = 1;
return 0;
}
int start_inband_exchange(int f_in, int f_out, const char *user, int argc, char *argv[])
{
int i, modlen;
char line[BIGPATHBUFLEN];
char *sargs[MAX_ARGS];
int sargc = 0;
char *p, *modname;
assert(argc > 0 && *argv != NULL);
if (**argv == '/') {
rprintf(FERROR,
"ERROR: The remote path must start with a module name\n");
return -1;
}
if (!(p = strchr(*argv, '/')))
modlen = strlen(*argv);
else
modlen = p - *argv;
modname = new_array(char, modlen+1+1); /* room for '/' & '\0' */
strlcpy(modname, *argv, modlen + 1);
modname[modlen] = '/';
modname[modlen+1] = '\0';
if (!user)
user = getenv("USER");
if (!user)
user = getenv("LOGNAME");
if (exchange_protocols(f_in, f_out, line, sizeof line, 1) < 0)
return -1;
if (early_input_file) {
STRUCT_STAT st;
FILE *f = fopen(early_input_file, "rb");
if (!f || do_fstat(fileno(f), &st) < 0) {
rsyserr(FERROR, errno, "failed to open %s", early_input_file);
return -1;
}
early_input_len = st.st_size;
if (early_input_len > (int)sizeof line) {
rprintf(FERROR, "%s is > %d bytes.\n", early_input_file, (int)sizeof line);
return -1;
}
if (early_input_len > 0) {
io_printf(f_out, EARLY_INPUT_CMD "%d\n", early_input_len);
while (early_input_len > 0) {
int len;
if (feof(f)) {
rprintf(FERROR, "Early EOF in %s\n", early_input_file);
return -1;
}
len = fread(line, 1, early_input_len, f);
if (len > 0) {
write_buf(f_out, line, len);
early_input_len -= len;
}
}
}
fclose(f);
}
server_options(sargs, &sargc);
if (sargc >= MAX_ARGS - 2)
goto arg_overflow;
sargs[sargc++] = ".";
while (argc > 0) {
if (sargc >= MAX_ARGS - 1) {
arg_overflow:
rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
exit_cleanup(RERR_SYNTAX);
}
if (strncmp(*argv, modname, modlen) == 0
&& argv[0][modlen] == '\0')
sargs[sargc++] = modname; /* we send "modname/" */
else if (**argv == '-') {
if (asprintf(sargs + sargc++, "./%s", *argv) < 0)
out_of_memory("start_inband_exchange");
} else
sargs[sargc++] = *argv;
argv++;
argc--;
}
sargs[sargc] = NULL;
if (DEBUG_GTE(CMD, 1))
print_child_argv("sending daemon args:", sargs);
io_printf(f_out, "%.*s\n", modlen, modname);
/* Old servers may just drop the connection here,
rather than sending a proper EXIT command. Yuck. */
kluge_around_eof = list_only && protocol_version < 25 ? 1 : 0;
while (1) {
if (!read_line_old(f_in, line, sizeof line, 0)) {
rprintf(FERROR, "rsync: didn't get server startup line\n");
return -1;
}
if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
auth_client(f_out, user, line+18);
continue;
}
if (strcmp(line,"@RSYNCD: OK") == 0)
break;
if (strcmp(line,"@RSYNCD: EXIT") == 0) {
/* This is sent by recent versions of the
* server to terminate the listing of modules.
* We don't want to go on and transfer
* anything; just exit. */
exit(0);
}
if (strncmp(line, "@ERROR", 6) == 0) {
rprintf(FERROR, "%s\n", line);
/* This is always fatal; the server will now
* close the socket. */
return -1;
}
/* This might be a MOTD line or a module listing, but there is
* no way to differentiate it. The manpage mentions this. */
if (output_motd)
rprintf(FINFO, "%s\n", line);
}
kluge_around_eof = 0;
if (rl_nulls) {
for (i = 0; i < sargc; i++) {
if (!sargs[i]) /* stop at --protect-args NULL */
break;
write_sbuf(f_out, sargs[i]);
write_byte(f_out, 0);
}
write_byte(f_out, 0);
} else {
for (i = 0; i < sargc; i++)
io_printf(f_out, "%s\n", sargs[i]);
write_sbuf(f_out, "\n");
}
if (protect_args)
send_protected_args(f_out, sargs);
if (protocol_version < 23) {
if (protocol_version == 22 || !am_sender)
io_start_multiplex_in(f_in);
}
free(modname);
return 0;
}
#ifdef HAVE_PUTENV
static int read_arg_from_pipe(int fd, char *buf, int limit)
{
char *bp = buf, *eob = buf + limit - 1;
while (1) {
int got = read(fd, bp, 1);
if (got != 1) {
if (got < 0 && errno == EINTR)
continue;
return -1;
}
if (*bp == '\0')
break;
if (bp < eob)
bp++;
}
*bp = '\0';
return bp - buf;
}
#endif
static void set_env_str(const char *var, const char *str)
{
#ifdef HAVE_PUTENV
char *mem;
if (asprintf(&mem, "%s=%s", var, str) < 0)
out_of_memory("set_env_str");
putenv(mem);
#endif
}
#ifdef HAVE_PUTENV
void set_env_num(const char *var, long num)
{
char *mem;
if (asprintf(&mem, "%s=%ld", var, num) < 0)
out_of_memory("set_env_num");
putenv(mem);
}
#endif
/* Used for "early exec", "pre-xfer exec", and the "name converter" script. */
static pid_t start_pre_exec(const char *cmd, int *arg_fd_ptr, int *error_fd_ptr)
{
int arg_fds[2], error_fds[2], arg_fd;
pid_t pid;
if ((error_fd_ptr && pipe(error_fds) < 0) || pipe(arg_fds) < 0 || (pid = fork()) < 0)
return (pid_t)-1;
if (pid == 0) {
char buf[BIGPATHBUFLEN];
int j, len, status;
if (error_fd_ptr) {
close(error_fds[0]);
set_blocking(error_fds[1]);
}
close(arg_fds[1]);
arg_fd = arg_fds[0];
set_blocking(arg_fd);
len = read_arg_from_pipe(arg_fd, buf, BIGPATHBUFLEN);
if (len <= 0)
_exit(1);
set_env_str("RSYNC_REQUEST", buf);
for (j = 0; ; j++) {
char *p;
len = read_arg_from_pipe(arg_fd, buf, BIGPATHBUFLEN);
if (len <= 0) {
if (!len)
break;
_exit(1);
}
if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) >= 0)
putenv(p);
}
dup2(arg_fd, STDIN_FILENO);
close(arg_fd);
if (error_fd_ptr) {
dup2(error_fds[1], STDOUT_FILENO);
close(error_fds[1]);
}
status = shell_exec(cmd);
if (!WIFEXITED(status))
_exit(1);
_exit(WEXITSTATUS(status));
}
if (error_fd_ptr) {
close(error_fds[1]);
*error_fd_ptr = error_fds[0];
set_blocking(error_fds[0]);
}
close(arg_fds[0]);
arg_fd = *arg_fd_ptr = arg_fds[1];
set_blocking(arg_fd);
return pid;
}
static void write_pre_exec_args(int write_fd, char *request, char **early_argv, char **argv, int exec_type)
{
int j = 0;
if (!request)
request = "(NONE)";
write_buf(write_fd, request, strlen(request)+1);
if (early_argv) {
for ( ; *early_argv; early_argv++)
write_buf(write_fd, *early_argv, strlen(*early_argv)+1);
j = 1; /* Skip arg0 name in argv. */
}
if (argv) {
for ( ; argv[j]; j++)
write_buf(write_fd, argv[j], strlen(argv[j])+1);
}
write_byte(write_fd, 0);
if (exec_type == 1 && early_input_len)
write_buf(write_fd, early_input, early_input_len);
if (exec_type != 2) /* the name converter needs this left open */
close(write_fd);
}
static char *finish_pre_exec(const char *desc, pid_t pid, int read_fd)
{
char buf[BIGPATHBUFLEN], *bp, *cr;
int j, status = -1, msglen = sizeof buf - 1;
if (read_fd >= 0) {
/* Read the stdout from the program. This it is only displayed
* to the user if the script also returns an error status. */
for (bp = buf, cr = buf; msglen > 0; msglen -= j) {
if ((j = read(read_fd, bp, msglen)) <= 0) {
if (j == 0)
break;
if (errno == EINTR)
continue;
break; /* Just ignore the read error for now... */
}
bp[j] = '\0';
while (1) {
if ((cr = strchr(cr, '\r')) == NULL) {
cr = bp + j;
break;
}
if (!cr[1])
break; /* wait for more data before we decide what to do */
if (cr[1] == '\n') {
memmove(cr, cr+1, j - (cr - bp));
j--;
} else
cr++;
}
bp += j;
}
*bp = '\0';
close(read_fd);
} else
*buf = '\0';
if (wait_process(pid, &status, 0) < 0
|| !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
char *e;
if (asprintf(&e, "%s returned failure (%d)%s%s%s\n%s",
desc, status, status < 0 ? ": " : "",
status < 0 ? strerror(errno) : "",
*buf ? ":" : "", buf) < 0)
return "out_of_memory in finish_pre_exec\n";
return e;
}
return NULL;
}
static int path_failure(int f_out, const char *dir, BOOL was_chdir)
{
if (was_chdir)
rsyserr(FLOG, errno, "chdir %s failed", dir);
else
rprintf(FLOG, "normalize_path(%s) failed\n", dir);
io_printf(f_out, "@ERROR: chdir failed\n");
return -1;
}
static int add_a_group(int f_out, const char *gname)
{
gid_t gid, *gid_p;
if (!group_to_gid(gname, &gid, True)) {
rprintf(FLOG, "Invalid gid %s\n", gname);
io_printf(f_out, "@ERROR: invalid gid %s\n", gname);
return -1;
}
gid_p = EXPAND_ITEM_LIST(&gid_list, gid_t, -32);
*gid_p = gid;
return 0;
}
#ifdef HAVE_GETGROUPLIST
static int want_all_groups(int f_out, uid_t uid)
{
const char *err;
if ((err = getallgroups(uid, &gid_list)) != NULL) {
rsyserr(FLOG, errno, "%s", err);
io_printf(f_out, "@ERROR: %s\n", err);
return -1;
}
return 0;
}
#elif defined HAVE_INITGROUPS
static struct passwd *want_all_groups(int f_out, uid_t uid)
{
struct passwd *pw;
gid_t *gid_p;
if ((pw = getpwuid(uid)) == NULL) {
rsyserr(FLOG, errno, "getpwuid failed");
io_printf(f_out, "@ERROR: getpwuid failed\n");
return NULL;
}
/* Start with the default group and initgroups() will add the rest. */
gid_p = EXPAND_ITEM_LIST(&gid_list, gid_t, -32);
*gid_p = pw->pw_gid;
return pw;
}
#endif
static int rsync_module(int f_in, int f_out, int i, const char *addr, const char *host)
{
int argc;
char **argv, **orig_argv, **orig_early_argv, *module_chdir;
char line[BIGPATHBUFLEN];
#if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
struct passwd *pw = NULL;
#endif
uid_t uid;
int set_uid;
char *p, *err_msg = NULL;
char *name = lp_name(i);
int use_chroot = lp_use_chroot(i);
int ret, pre_exec_arg_fd = -1, pre_exec_error_fd = -1;
int save_munge_symlinks;
pid_t pre_exec_pid = 0;
char *request = NULL;
set_env_str("RSYNC_MODULE_NAME", name);
#ifdef ICONV_OPTION
iconv_opt = lp_charset(i);
if (*iconv_opt)
setup_iconv();
iconv_opt = NULL;
#endif
/* If reverse lookup is disabled globally but enabled for this module,
* we need to do it now before the access check. */
if (host == undetermined_hostname && lp_reverse_lookup(i))
host = client_name(client_addr(f_in));
set_env_str("RSYNC_HOST_NAME", host);
set_env_str("RSYNC_HOST_ADDR", addr);
if (!allow_access(addr, &host, i)) {
rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
name, host, addr);
if (!lp_list(i))
io_printf(f_out, "@ERROR: Unknown module '%s'\n", name);
else {
io_printf(f_out,
"@ERROR: access denied to %s from %s (%s)\n",
name, host, addr);
}
return -1;
}
if (am_daemon > 0) {
rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
name, host, addr);
}
if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
if (errno) {
rsyserr(FLOG, errno, "failed to open lock file %s",
lp_lock_file(i));
io_printf(f_out, "@ERROR: failed to open lock file\n");
} else {
rprintf(FLOG, "max connections (%d) reached\n",
lp_max_connections(i));
io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n",
lp_max_connections(i));
}
return -1;
}
read_only = lp_read_only(i); /* may also be overridden by auth_server() */
auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD ");
if (!auth_user) {
io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
return -1;
}
set_env_str("RSYNC_USER_NAME", auth_user);
module_id = i;
if (lp_transfer_logging(module_id) && !logfile_format)
logfile_format = lp_log_format(module_id);
if (log_format_has(logfile_format, 'i'))
logfile_format_has_i = 1;
if (logfile_format_has_i || log_format_has(logfile_format, 'o'))
logfile_format_has_o_or_i = 1;
uid = MY_UID();
am_root = (uid == ROOT_UID);
p = *lp_uid(module_id) ? lp_uid(module_id) : am_root ? NOBODY_USER : NULL;
if (p) {
if (!user_to_uid(p, &uid, True)) {
rprintf(FLOG, "Invalid uid %s\n", p);
io_printf(f_out, "@ERROR: invalid uid %s\n", p);
return -1;
}
set_uid = 1;
} else
set_uid = 0;
p = *lp_gid(module_id) ? conf_strtok(lp_gid(module_id)) : NULL;
if (p) {
/* The "*" gid must be the first item in the list. */
if (strcmp(p, "*") == 0) {
#ifdef HAVE_GETGROUPLIST
if (want_all_groups(f_out, uid) < 0)
return -1;
#elif defined HAVE_INITGROUPS
if ((pw = want_all_groups(f_out, uid)) == NULL)
return -1;
#else
rprintf(FLOG, "This rsync does not support a gid of \"*\"\n");
io_printf(f_out, "@ERROR: invalid gid setting.\n");
return -1;
#endif
} else if (add_a_group(f_out, p) < 0)
return -1;
while ((p = conf_strtok(NULL)) != NULL) {
#if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
if (pw) {
rprintf(FLOG, "This rsync cannot add groups after \"*\".\n");
io_printf(f_out, "@ERROR: invalid gid setting.\n");
return -1;
}
#endif
if (add_a_group(f_out, p) < 0)
return -1;
}
} else if (am_root) {
if (add_a_group(f_out, NOBODY_GROUP) < 0)
return -1;
}
module_dir = lp_path(module_id);
if (*module_dir == '\0') {
rprintf(FLOG, "No path specified for module %s\n", name);
io_printf(f_out, "@ERROR: no path setting.\n");
return -1;
}
if (use_chroot) {
if ((p = strstr(module_dir, "/./")) != NULL) {
*p = '\0'; /* Temporary... */
if (!(module_chdir = normalize_path(module_dir, True, NULL)))
return path_failure(f_out, module_dir, False);
*p = '/';
if (!(p = normalize_path(p + 2, True, &module_dirlen)))
return path_failure(f_out, strstr(module_dir, "/./"), False);
if (!(full_module_path = normalize_path(module_dir, False, NULL)))
full_module_path = module_dir;
module_dir = p;
} else {
if (!(module_chdir = normalize_path(module_dir, False, NULL)))
return path_failure(f_out, module_dir, False);
full_module_path = module_chdir;
module_dir = "/";
module_dirlen = 1;
}
} else {
if (!(module_chdir = normalize_path(module_dir, False, &module_dirlen)))
return path_failure(f_out, module_dir, False);
full_module_path = module_dir = module_chdir;
}
set_env_str("RSYNC_MODULE_PATH", full_module_path);
if (module_dirlen == 1) {
module_dirlen = 0;
set_filter_dir("/", 1);
} else
set_filter_dir(module_dir, module_dirlen);
p = lp_filter(module_id);
parse_filter_str(&daemon_filter_list, p, rule_template(FILTRULE_WORD_SPLIT),
XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3);
p = lp_include_from(module_id);
parse_filter_file(&daemon_filter_list, p, rule_template(FILTRULE_INCLUDE),
XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
p = lp_include(module_id);
parse_filter_str(&daemon_filter_list, p,
rule_template(FILTRULE_INCLUDE | FILTRULE_WORD_SPLIT),
XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
p = lp_exclude_from(module_id);
parse_filter_file(&daemon_filter_list, p, rule_template(0),
XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
p = lp_exclude(module_id);
parse_filter_str(&daemon_filter_list, p, rule_template(FILTRULE_WORD_SPLIT),
XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
log_init(1);
#ifdef HAVE_PUTENV
if ((*lp_early_exec(module_id) || *lp_prexfer_exec(module_id)
|| *lp_postxfer_exec(module_id) || *lp_name_converter(module_id))
&& !getenv("RSYNC_NO_XFER_EXEC")) {
set_env_num("RSYNC_PID", (long)getpid());
/* For post-xfer exec, fork a new process to run the rsync
* daemon while this process waits for the exit status and
* runs the indicated command at that point. */
if (*lp_postxfer_exec(module_id)) {
pid_t pid = fork();
if (pid < 0) {
rsyserr(FLOG, errno, "fork failed");
io_printf(f_out, "@ERROR: fork failed\n");
return -1;
}
if (pid) {
int status;
close(f_in);
if (f_out != f_in)
close(f_out);
if (wait_process(pid, &status, 0) < 0)
status = -1;
set_env_num("RSYNC_RAW_STATUS", status);
if (WIFEXITED(status))
status = WEXITSTATUS(status);
else
status = -1;
set_env_num("RSYNC_EXIT_STATUS", status);
if (shell_exec(lp_postxfer_exec(module_id)) < 0)
status = -1;
_exit(status);
}
}
/* For early exec, fork a child process to run the indicated
* command and wait for it to exit. */
if (*lp_early_exec(module_id)) {
int arg_fd;
pid_t pid = start_pre_exec(lp_early_exec(module_id), &arg_fd, NULL);
if (pid == (pid_t)-1) {
rsyserr(FLOG, errno, "early exec preparation failed");
io_printf(f_out, "@ERROR: early exec preparation failed\n");
return -1;
}
write_pre_exec_args(arg_fd, NULL, NULL, NULL, 1);
if (finish_pre_exec("early exec", pid, -1) != NULL) {
rsyserr(FLOG, errno, "early exec failed");
io_printf(f_out, "@ERROR: early exec failed\n");
return -1;
}
}
/* For pre-xfer exec, fork a child process to run the indicated
* command, though it first waits for the parent process to
* send us the user's request via a pipe. */
if (*lp_prexfer_exec(module_id)) {
pre_exec_pid = start_pre_exec(lp_prexfer_exec(module_id), &pre_exec_arg_fd, &pre_exec_error_fd);
if (pre_exec_pid == (pid_t)-1) {
rsyserr(FLOG, errno, "pre-xfer exec preparation failed");
io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n");
return -1;
}
}
if (*lp_name_converter(module_id)) {
namecvt_pid = start_pre_exec(lp_name_converter(module_id), &namecvt_fd_req, &namecvt_fd_ans);
if (namecvt_pid == (pid_t)-1) {
rsyserr(FLOG, errno, "name-converter exec preparation failed");
io_printf(f_out, "@ERROR: name-converter exec preparation failed\n");
return -1;
}
}
}
#endif
if (early_input) {
free(early_input);
early_input = NULL;
}
if (use_chroot) {
/*
* XXX: The 'use chroot' flag is a fairly reliable
* source of confusion, because it fails under two
* important circumstances: running as non-root,
* running on Win32 (or possibly others). On the
* other hand, if you are running as root, then it
* might be better to always use chroot.
*
* So, perhaps if we can't chroot we should just issue
* a warning, unless a "require chroot" flag is set,
* in which case we fail.
*/
if (chroot(module_chdir)) {
rsyserr(FLOG, errno, "chroot %s failed", module_chdir);
io_printf(f_out, "@ERROR: chroot failed\n");
return -1;
}
module_chdir = module_dir;
}
if (!change_dir(module_chdir, CD_NORMAL))
return path_failure(f_out, module_chdir, True);
if (module_dirlen || (!use_chroot && !*lp_daemon_chroot()))
sanitize_paths = 1;
if ((munge_symlinks = lp_munge_symlinks(module_id)) < 0)
munge_symlinks = !use_chroot || module_dirlen;
if (munge_symlinks) {
STRUCT_STAT st;
char prefix[SYMLINK_PREFIX_LEN]; /* NOT +1 ! */
strlcpy(prefix, SYMLINK_PREFIX, sizeof prefix); /* trim the trailing slash */
if (do_stat(prefix, &st) == 0 && S_ISDIR(st.st_mode)) {
rprintf(FLOG, "Symlink munging is unsafe when a %s directory exists.\n",
prefix);
io_printf(f_out, "@ERROR: daemon security issue -- contact admin\n", name);
exit_cleanup(RERR_UNSUPPORTED);
}
}
if (gid_list.count) {
gid_t *gid_array = gid_list.items;
if (setgid(gid_array[0])) {
rsyserr(FLOG, errno, "setgid %ld failed", (long)gid_array[0]);
io_printf(f_out, "@ERROR: setgid failed\n");
return -1;
}
#ifdef HAVE_SETGROUPS
/* Set the group(s) we want to be active. */
if (setgroups(gid_list.count, gid_array)) {
rsyserr(FLOG, errno, "setgroups failed");
io_printf(f_out, "@ERROR: setgroups failed\n");
return -1;
}
#endif
#if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
/* pw is set if the user wants all the user's groups. */
if (pw && initgroups(pw->pw_name, pw->pw_gid) < 0) {
rsyserr(FLOG, errno, "initgroups failed");
io_printf(f_out, "@ERROR: initgroups failed\n");
return -1;
}
#endif
our_gid = MY_GID();
}
if (set_uid) {
if (setuid(uid) < 0
#ifdef HAVE_SETEUID
|| seteuid(uid) < 0
#endif
) {
rsyserr(FLOG, errno, "setuid %ld failed", (long)uid);
io_printf(f_out, "@ERROR: setuid failed\n");
return -1;
}
our_uid = MY_UID();
am_root = (our_uid == ROOT_UID);
}
if (lp_temp_dir(module_id) && *lp_temp_dir(module_id)) {
tmpdir = lp_temp_dir(module_id);
if (strlen(tmpdir) >= MAXPATHLEN - 10) {
rprintf(FLOG,
"the 'temp dir' value for %s is WAY too long -- ignoring.\n",
name);
tmpdir = NULL;
}
}
io_printf(f_out, "@RSYNCD: OK\n");
read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request);
orig_argv = argv;
save_munge_symlinks = munge_symlinks;
reset_output_levels(); /* future verbosity is controlled by client options */
ret = parse_arguments(&argc, (const char ***) &argv);
if (protect_args && ret) {
orig_early_argv = orig_argv;
protect_args = 2;
read_args(f_in, name, line, sizeof line, 1, &argv, &argc, &request);
orig_argv = argv;
ret = parse_arguments(&argc, (const char ***) &argv);
} else
orig_early_argv = NULL;