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- Committer: Teddy Hogeborn
- Date: 2017-02-21 18:23:54 UTC
- Revision ID: teddy@recompile.se-20170221182354-qjl75f74t02bbm5n
Suppress lintian warning about lsb-base dependency
This warning is erroneous since we do depend on lsb-base, we just also
depend on systemd-sysv as an alternative, since if that is installed,
the /etc/init.d/mandos script (which is the thing which actually
requires lsb-base) is never run anyway. Suppress this warning.
* debian/mandos.lintian-overrides (mandos): Add new line
"init.d-script-needs-depends-on-lsb-base etc/init.d/mandos (line
49)"
This warning is erroneous since we do depend on lsb-base, we just also
depend on systemd-sysv as an alternative, since if that is installed,
the /etc/init.d/mandos script (which is the thing which actually
requires lsb-base) is never run anyway. Suppress this warning.
* debian/mandos.lintian-overrides (mandos): Add new line
"init.d-script-needs-depends-on-lsb-base etc/init.d/mandos (line
49)"
- files added:
- bugs.xml
- debian/upstream
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy(), strsignal()
51
*/
51
52
#include <sys/ioctl.h> /* ioctl */
52
53
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
54
sockaddr_in6, PF_INET6,
55
56
opendir(), DIR */
56
57
#include <sys/stat.h> /* open(), S_ISREG */
57
58
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
59
inet_pton(), connect(),
60
getnameinfo() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
62
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
63
*/
62
64
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
65
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
66
71
program_invocation_short_name */
67
72
#include <time.h> /* nanosleep(), time(), sleep() */
68
73
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
78
*/
74
79
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
80
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
81
setgid(), pause(), _exit(),
82
unlinkat() */
83
#include <arpa/inet.h> /* inet_pton(), htons() */
78
84
#include <iso646.h> /* not, or, and */
79
85
#include <argp.h> /* struct argp_option, error_t, struct
80
86
argp_state, struct argp,
87
93
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
94
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
95
WEXITSTATUS(), WTERMSIG() */
96
#include <grp.h> /* setgroups() */
97
#include <argz.h> /* argz_add_sep(), argz_next(),
98
argz_delete(), argz_append(),
99
argz_stringify(), argz_add(),
100
argz_count() */
101
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
102
EAI_SYSTEM, gai_strerror() */
90
103
91
104
#ifdef __linux__
92
105
#include <sys/klog.h> /* klogctl() */
134
147
static const char sys_class_net[] = "/sys/class/net";
135
148
char *connect_to = NULL;
136
149
const char *hookdir = HOOKDIR;
150
int hookdir_fd = -1;
151
uid_t uid = 65534;
152
gid_t gid = 65534;
137
153
138
154
/* Doubly linked list that need to be circularly linked when used */
139
155
typedef struct server{
140
156
const char *ip;
141
uint16_t port;
157
in_port_t port;
142
158
AvahiIfIndex if_index;
143
159
int af;
144
160
struct timespec last_seen;
148
164
149
165
/* Used for passing in values through the Avahi callback functions */
150
166
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
167
AvahiServer *server;
153
168
gnutls_certificate_credentials_t cred;
154
169
unsigned int dh_bits;
156
171
const char *priority;
157
172
gpgme_ctx_t ctx;
158
173
server *current_server;
174
char *interfaces;
175
size_t interfaces_size;
159
176
} mandos_context;
160
177
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
178
/* global so signal handler can reach it*/
179
AvahiSimplePoll *simple_poll;
166
180
167
181
sig_atomic_t quit_now = 0;
168
182
int signal_received = 0;
169
183
170
184
/* Function to use when printing errors */
171
185
void perror_plus(const char *print_text){
186
int e = errno;
172
187
fprintf(stderr, "Mandos plugin %s: ",
173
188
program_invocation_short_name);
189
errno = e;
174
190
perror(print_text);
175
191
}
176
192
193
__attribute__((format (gnu_printf, 2, 3), nonnull))
177
194
int fprintf_plus(FILE *stream, const char *format, ...){
178
195
va_list ap;
179
196
va_start (ap, format);
180
197
181
198
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
182
199
program_invocation_short_name));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
200
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
201
}
185
202
186
203
/*
188
205
* bytes. "buffer_capacity" is how much is currently allocated,
189
206
* "buffer_length" is how much is already used.
190
207
*/
208
__attribute__((nonnull, warn_unused_result))
191
209
size_t incbuffer(char **buffer, size_t buffer_length,
192
210
size_t buffer_capacity){
193
211
if(buffer_length + BUFFER_SIZE > buffer_capacity){
194
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
if(buffer == NULL){
212
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
if(new_buf == NULL){
214
int old_errno = errno;
215
free(*buffer);
216
errno = old_errno;
217
*buffer = NULL;
196
218
return 0;
197
219
}
220
*buffer = new_buf;
198
221
buffer_capacity += BUFFER_SIZE;
199
222
}
200
223
return buffer_capacity;
201
224
}
202
225
203
226
/* Add server to set of servers to retry periodically */
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
227
__attribute__((nonnull, warn_unused_result))
228
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
229
int af, server **current_server){
206
230
int ret;
207
231
server *new_server = malloc(sizeof(server));
208
232
if(new_server == NULL){
209
233
perror_plus("malloc");
210
return -1;
234
return false;
211
235
}
212
236
*new_server = (server){ .ip = strdup(ip),
213
237
.port = port,
215
239
.af = af };
216
240
if(new_server->ip == NULL){
217
241
perror_plus("strdup");
218
return -1;
242
free(new_server);
243
return false;
244
}
245
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
246
if(ret == -1){
247
perror_plus("clock_gettime");
248
#ifdef __GNUC__
249
#pragma GCC diagnostic push
250
#pragma GCC diagnostic ignored "-Wcast-qual"
251
#endif
252
free((char *)(new_server->ip));
253
#ifdef __GNUC__
254
#pragma GCC diagnostic pop
255
#endif
256
free(new_server);
257
return false;
219
258
}
220
259
/* Special case of first server */
221
if (mc.current_server == NULL){
260
if(*current_server == NULL){
222
261
new_server->next = new_server;
223
262
new_server->prev = new_server;
224
mc.current_server = new_server;
225
/* Place the new server last in the list */
263
*current_server = new_server;
226
264
} else {
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
265
/* Place the new server last in the list */
266
new_server->next = *current_server;
267
new_server->prev = (*current_server)->prev;
229
268
new_server->prev->next = new_server;
230
mc.current_server->prev = new_server;
231
}
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
233
if(ret == -1){
234
perror_plus("clock_gettime");
235
return -1;
236
}
237
return 0;
269
(*current_server)->prev = new_server;
270
}
271
return true;
238
272
}
239
273
240
274
/*
241
275
* Initialize GPGME.
242
276
*/
243
static bool init_gpgme(const char *seckey, const char *pubkey,
244
const char *tempdir){
277
__attribute__((nonnull, warn_unused_result))
278
static bool init_gpgme(const char * const seckey,
279
const char * const pubkey,
280
const char * const tempdir,
281
mandos_context *mc){
245
282
gpgme_error_t rc;
246
283
gpgme_engine_info_t engine_info;
247
284
248
249
285
/*
250
286
* Helper function to insert pub and seckey to the engine keyring.
251
287
*/
252
bool import_key(const char *filename){
288
bool import_key(const char * const filename){
253
289
int ret;
254
290
int fd;
255
291
gpgme_data_t pgp_data;
267
303
return false;
268
304
}
269
305
270
rc = gpgme_op_import(mc.ctx, pgp_data);
306
rc = gpgme_op_import(mc->ctx, pgp_data);
271
307
if(rc != GPG_ERR_NO_ERROR){
272
308
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
273
309
gpgme_strsource(rc), gpgme_strerror(rc));
274
310
return false;
275
311
}
276
312
277
ret = (int)TEMP_FAILURE_RETRY(close(fd));
313
ret = close(fd);
278
314
if(ret == -1){
279
315
perror_plus("close");
280
316
}
317
353
}
318
354
319
355
/* Create new GPGME "context" */
320
rc = gpgme_new(&(mc.ctx));
356
rc = gpgme_new(&(mc->ctx));
321
357
if(rc != GPG_ERR_NO_ERROR){
322
358
fprintf_plus(stderr, "Mandos plugin mandos-client: "
323
359
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
336
372
* Decrypt OpenPGP data.
337
373
* Returns -1 on error
338
374
*/
375
__attribute__((nonnull, warn_unused_result))
339
376
static ssize_t pgp_packet_decrypt(const char *cryptotext,
340
377
size_t crypto_size,
341
char **plaintext){
378
char **plaintext,
379
mandos_context *mc){
342
380
gpgme_data_t dh_crypto, dh_plain;
343
381
gpgme_error_t rc;
344
382
ssize_t ret;
370
408
371
409
/* Decrypt data from the cryptotext data buffer to the plaintext
372
410
data buffer */
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
411
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
412
if(rc != GPG_ERR_NO_ERROR){
375
413
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
414
gpgme_strsource(rc), gpgme_strerror(rc));
377
415
plaintext_length = -1;
378
416
if(debug){
379
417
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
418
result = gpgme_op_decrypt_result(mc->ctx);
381
419
if(result == NULL){
382
420
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
383
421
} else {
460
498
return plaintext_length;
461
499
}
462
500
463
static const char * safer_gnutls_strerror(int value){
464
const char *ret = gnutls_strerror(value); /* Spurious warning from
465
-Wunreachable-code */
466
if(ret == NULL)
467
ret = "(unknown)";
468
return ret;
501
__attribute__((warn_unused_result, const))
502
static const char *safe_string(const char *str){
503
if(str == NULL)
504
return "(unknown)";
505
return str;
506
}
507
508
__attribute__((warn_unused_result))
509
static const char *safer_gnutls_strerror(int value){
510
const char *ret = gnutls_strerror(value);
511
return safe_string(ret);
469
512
}
470
513
471
514
/* GnuTLS log function callback */
515
__attribute__((nonnull))
472
516
static void debuggnutls(__attribute__((unused)) int level,
473
517
const char* string){
474
518
fprintf_plus(stderr, "GnuTLS: %s", string);
475
519
}
476
520
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
477
522
static int init_gnutls_global(const char *pubkeyfilename,
478
const char *seckeyfilename){
523
const char *seckeyfilename,
524
const char *dhparamsfilename,
525
mandos_context *mc){
479
526
int ret;
527
unsigned int uret;
480
528
481
529
if(debug){
482
530
fprintf_plus(stderr, "Initializing GnuTLS\n");
483
531
}
484
532
485
ret = gnutls_global_init();
486
if(ret != GNUTLS_E_SUCCESS){
487
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
488
safer_gnutls_strerror(ret));
489
return -1;
490
}
491
492
533
if(debug){
493
534
/* "Use a log level over 10 to enable all debugging options."
494
535
* - GnuTLS manual
498
539
}
499
540
500
541
/* OpenPGP credentials */
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
542
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
543
if(ret != GNUTLS_E_SUCCESS){
503
544
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
504
545
safer_gnutls_strerror(ret));
505
gnutls_global_deinit();
506
546
return -1;
507
547
}
508
548
514
554
}
515
555
516
556
ret = gnutls_certificate_set_openpgp_key_file
517
(mc.cred, pubkeyfilename, seckeyfilename,
557
(mc->cred, pubkeyfilename, seckeyfilename,
518
558
GNUTLS_OPENPGP_FMT_BASE64);
519
559
if(ret != GNUTLS_E_SUCCESS){
520
560
fprintf_plus(stderr,
526
566
}
527
567
528
568
/* GnuTLS server initialization */
529
ret = gnutls_dh_params_init(&mc.dh_params);
569
ret = gnutls_dh_params_init(&mc->dh_params);
530
570
if(ret != GNUTLS_E_SUCCESS){
531
571
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
532
572
" initialization: %s\n",
533
573
safer_gnutls_strerror(ret));
534
574
goto globalfail;
535
575
}
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
537
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
safer_gnutls_strerror(ret));
540
goto globalfail;
541
}
542
543
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
576
/* If a Diffie-Hellman parameters file was given, try to use it */
577
if(dhparamsfilename != NULL){
578
gnutls_datum_t params = { .data = NULL, .size = 0 };
579
do {
580
int dhpfile = open(dhparamsfilename, O_RDONLY);
581
if(dhpfile == -1){
582
perror_plus("open");
583
dhparamsfilename = NULL;
584
break;
585
}
586
size_t params_capacity = 0;
587
while(true){
588
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params.size,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
592
perror_plus("incbuffer");
593
free(params.data);
594
params.data = NULL;
595
dhparamsfilename = NULL;
596
break;
597
}
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
600
BUFFER_SIZE);
601
/* EOF */
602
if(bytes_read == 0){
603
break;
604
}
605
/* check bytes_read for failure */
606
if(bytes_read < 0){
607
perror_plus("read");
608
free(params.data);
609
params.data = NULL;
610
dhparamsfilename = NULL;
611
break;
612
}
613
params.size += (unsigned int)bytes_read;
614
}
615
if(params.data == NULL){
616
dhparamsfilename = NULL;
617
}
618
if(dhparamsfilename == NULL){
619
break;
620
}
621
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
622
GNUTLS_X509_FMT_PEM);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Failed to parse DH parameters in file"
625
" \"%s\": %s\n", dhparamsfilename,
626
safer_gnutls_strerror(ret));
627
dhparamsfilename = NULL;
628
}
629
free(params.data);
630
} while(false);
631
}
632
if(dhparamsfilename == NULL){
633
if(mc->dh_bits == 0){
634
/* Find out the optimal number of DH bits */
635
/* Try to read the private key file */
636
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
637
do {
638
int secfile = open(seckeyfilename, O_RDONLY);
639
if(secfile == -1){
640
perror_plus("open");
641
break;
642
}
643
size_t buffer_capacity = 0;
644
while(true){
645
buffer_capacity = incbuffer((char **)&buffer.data,
646
(size_t)buffer.size,
647
(size_t)buffer_capacity);
648
if(buffer_capacity == 0){
649
perror_plus("incbuffer");
650
free(buffer.data);
651
buffer.data = NULL;
652
break;
653
}
654
ssize_t bytes_read = read(secfile,
655
buffer.data + buffer.size,
656
BUFFER_SIZE);
657
/* EOF */
658
if(bytes_read == 0){
659
break;
660
}
661
/* check bytes_read for failure */
662
if(bytes_read < 0){
663
perror_plus("read");
664
free(buffer.data);
665
buffer.data = NULL;
666
break;
667
}
668
buffer.size += (unsigned int)bytes_read;
669
}
670
close(secfile);
671
} while(false);
672
/* If successful, use buffer to parse private key */
673
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
674
if(buffer.data != NULL){
675
{
676
gnutls_openpgp_privkey_t privkey = NULL;
677
ret = gnutls_openpgp_privkey_init(&privkey);
678
if(ret != GNUTLS_E_SUCCESS){
679
fprintf_plus(stderr, "Error initializing OpenPGP key"
680
" structure: %s",
681
safer_gnutls_strerror(ret));
682
free(buffer.data);
683
buffer.data = NULL;
684
} else {
685
ret = gnutls_openpgp_privkey_import
686
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
687
if(ret != GNUTLS_E_SUCCESS){
688
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
689
safer_gnutls_strerror(ret));
690
privkey = NULL;
691
}
692
free(buffer.data);
693
buffer.data = NULL;
694
if(privkey != NULL){
695
/* Use private key to suggest an appropriate
696
sec_param */
697
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
698
gnutls_openpgp_privkey_deinit(privkey);
699
if(debug){
700
fprintf_plus(stderr, "This OpenPGP key implies using"
701
" a GnuTLS security parameter \"%s\".\n",
702
safe_string(gnutls_sec_param_get_name
703
(sec_param)));
704
}
705
}
706
}
707
}
708
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
709
/* Err on the side of caution */
710
sec_param = GNUTLS_SEC_PARAM_ULTRA;
711
if(debug){
712
fprintf_plus(stderr, "Falling back to security parameter"
713
" \"%s\"\n",
714
safe_string(gnutls_sec_param_get_name
715
(sec_param)));
716
}
717
}
718
}
719
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
720
if(uret != 0){
721
mc->dh_bits = uret;
722
if(debug){
723
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
724
" implies %u DH bits; using that.\n",
725
safe_string(gnutls_sec_param_get_name
726
(sec_param)),
727
mc->dh_bits);
728
}
729
} else {
730
fprintf_plus(stderr, "Failed to get implied number of DH"
731
" bits for security parameter \"%s\"): %s\n",
732
safe_string(gnutls_sec_param_get_name
733
(sec_param)),
734
safer_gnutls_strerror(ret));
735
goto globalfail;
736
}
737
} else if(debug){
738
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
739
mc->dh_bits);
740
}
741
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
742
if(ret != GNUTLS_E_SUCCESS){
743
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
744
" bits): %s\n", mc->dh_bits,
745
safer_gnutls_strerror(ret));
746
goto globalfail;
747
}
748
}
749
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
750
545
751
return 0;
546
752
547
753
globalfail:
548
754
549
gnutls_certificate_free_credentials(mc.cred);
550
gnutls_global_deinit();
551
gnutls_dh_params_deinit(mc.dh_params);
755
gnutls_certificate_free_credentials(mc->cred);
756
gnutls_dh_params_deinit(mc->dh_params);
552
757
return -1;
553
758
}
554
759
555
static int init_gnutls_session(gnutls_session_t *session){
760
__attribute__((nonnull, warn_unused_result))
761
static int init_gnutls_session(gnutls_session_t *session,
762
mandos_context *mc){
556
763
int ret;
557
764
/* GnuTLS session creation */
558
765
do {
570
777
{
571
778
const char *err;
572
779
do {
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
780
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
781
if(quit_now){
575
782
gnutls_deinit(*session);
576
783
return -1;
587
794
588
795
do {
589
796
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
590
mc.cred);
797
mc->cred);
591
798
if(quit_now){
592
799
gnutls_deinit(*session);
593
800
return -1;
603
810
/* ignore client certificate if any. */
604
811
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
605
812
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
607
608
813
return 0;
609
814
}
610
815
612
817
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
613
818
__attribute__((unused)) const char *txt){}
614
819
820
/* Set effective uid to 0, return errno */
821
__attribute__((warn_unused_result))
822
int raise_privileges(void){
823
int old_errno = errno;
824
int ret = 0;
825
if(seteuid(0) == -1){
826
ret = errno;
827
}
828
errno = old_errno;
829
return ret;
830
}
831
832
/* Set effective and real user ID to 0. Return errno. */
833
__attribute__((warn_unused_result))
834
int raise_privileges_permanently(void){
835
int old_errno = errno;
836
int ret = raise_privileges();
837
if(ret != 0){
838
errno = old_errno;
839
return ret;
840
}
841
if(setuid(0) == -1){
842
ret = errno;
843
}
844
errno = old_errno;
845
return ret;
846
}
847
848
/* Set effective user ID to unprivileged saved user ID */
849
__attribute__((warn_unused_result))
850
int lower_privileges(void){
851
int old_errno = errno;
852
int ret = 0;
853
if(seteuid(uid) == -1){
854
ret = errno;
855
}
856
errno = old_errno;
857
return ret;
858
}
859
860
/* Lower privileges permanently */
861
__attribute__((warn_unused_result))
862
int lower_privileges_permanently(void){
863
int old_errno = errno;
864
int ret = 0;
865
if(setuid(uid) == -1){
866
ret = errno;
867
}
868
errno = old_errno;
869
return ret;
870
}
871
872
/* Helper function to add_local_route() and delete_local_route() */
873
__attribute__((nonnull, warn_unused_result))
874
static bool add_delete_local_route(const bool add,
875
const char *address,
876
AvahiIfIndex if_index){
877
int ret;
878
char helper[] = "mandos-client-iprouteadddel";
879
char add_arg[] = "add";
880
char delete_arg[] = "delete";
881
char debug_flag[] = "--debug";
882
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
883
if(pluginhelperdir == NULL){
884
if(debug){
885
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
886
" variable not set; cannot run helper\n");
887
}
888
return false;
889
}
890
891
char interface[IF_NAMESIZE];
892
if(if_indextoname((unsigned int)if_index, interface) == NULL){
893
perror_plus("if_indextoname");
894
return false;
895
}
896
897
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
898
if(devnull == -1){
899
perror_plus("open(\"/dev/null\", O_RDONLY)");
900
return false;
901
}
902
pid_t pid = fork();
903
if(pid == 0){
904
/* Child */
905
/* Raise privileges */
906
errno = raise_privileges_permanently();
907
if(errno != 0){
908
perror_plus("Failed to raise privileges");
909
/* _exit(EX_NOPERM); */
910
} else {
911
/* Set group */
912
errno = 0;
913
ret = setgid(0);
914
if(ret == -1){
915
perror_plus("setgid");
916
_exit(EX_NOPERM);
917
}
918
/* Reset supplementary groups */
919
errno = 0;
920
ret = setgroups(0, NULL);
921
if(ret == -1){
922
perror_plus("setgroups");
923
_exit(EX_NOPERM);
924
}
925
}
926
ret = dup2(devnull, STDIN_FILENO);
927
if(ret == -1){
928
perror_plus("dup2(devnull, STDIN_FILENO)");
929
_exit(EX_OSERR);
930
}
931
ret = close(devnull);
932
if(ret == -1){
933
perror_plus("close");
934
_exit(EX_OSERR);
935
}
936
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
937
if(ret == -1){
938
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
939
_exit(EX_OSERR);
940
}
941
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
942
O_RDONLY
943
| O_DIRECTORY
944
| O_PATH
945
| O_CLOEXEC));
946
if(helperdir_fd == -1){
947
perror_plus("open");
948
_exit(EX_UNAVAILABLE);
949
}
950
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
951
helper, O_RDONLY));
952
if(helper_fd == -1){
953
perror_plus("openat");
954
close(helperdir_fd);
955
_exit(EX_UNAVAILABLE);
956
}
957
close(helperdir_fd);
958
#ifdef __GNUC__
959
#pragma GCC diagnostic push
960
#pragma GCC diagnostic ignored "-Wcast-qual"
961
#endif
962
if(fexecve(helper_fd, (char *const [])
963
{ helper, add ? add_arg : delete_arg, (char *)address,
964
interface, debug ? debug_flag : NULL, NULL },
965
environ) == -1){
966
#ifdef __GNUC__
967
#pragma GCC diagnostic pop
968
#endif
969
perror_plus("fexecve");
970
_exit(EXIT_FAILURE);
971
}
972
}
973
if(pid == -1){
974
perror_plus("fork");
975
return false;
976
}
977
int status;
978
pid_t pret = -1;
979
errno = 0;
980
do {
981
pret = waitpid(pid, &status, 0);
982
if(pret == -1 and errno == EINTR and quit_now){
983
int errno_raising = 0;
984
if((errno = raise_privileges()) != 0){
985
errno_raising = errno;
986
perror_plus("Failed to raise privileges in order to"
987
" kill helper program");
988
}
989
if(kill(pid, SIGTERM) == -1){
990
perror_plus("kill");
991
}
992
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
993
perror_plus("Failed to lower privileges after killing"
994
" helper program");
995
}
996
return false;
997
}
998
} while(pret == -1 and errno == EINTR);
999
if(pret == -1){
1000
perror_plus("waitpid");
1001
return false;
1002
}
1003
if(WIFEXITED(status)){
1004
if(WEXITSTATUS(status) != 0){
1005
fprintf_plus(stderr, "Error: iprouteadddel exited"
1006
" with status %d\n", WEXITSTATUS(status));
1007
return false;
1008
}
1009
return true;
1010
}
1011
if(WIFSIGNALED(status)){
1012
fprintf_plus(stderr, "Error: iprouteadddel died by"
1013
" signal %d\n", WTERMSIG(status));
1014
return false;
1015
}
1016
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1017
return false;
1018
}
1019
1020
__attribute__((nonnull, warn_unused_result))
1021
static bool add_local_route(const char *address,
1022
AvahiIfIndex if_index){
1023
if(debug){
1024
fprintf_plus(stderr, "Adding route to %s\n", address);
1025
}
1026
return add_delete_local_route(true, address, if_index);
1027
}
1028
1029
__attribute__((nonnull, warn_unused_result))
1030
static bool delete_local_route(const char *address,
1031
AvahiIfIndex if_index){
1032
if(debug){
1033
fprintf_plus(stderr, "Removing route to %s\n", address);
1034
}
1035
return add_delete_local_route(false, address, if_index);
1036
}
1037
615
1038
/* Called when a Mandos server is found */
616
static int start_mandos_communication(const char *ip, uint16_t port,
1039
__attribute__((nonnull, warn_unused_result))
1040
static int start_mandos_communication(const char *ip, in_port_t port,
617
1041
AvahiIfIndex if_index,
618
int af){
1042
int af, mandos_context *mc){
619
1043
int ret, tcp_sd = -1;
620
1044
ssize_t sret;
621
union {
622
struct sockaddr_in in;
623
struct sockaddr_in6 in6;
624
} to;
1045
struct sockaddr_storage to;
625
1046
char *buffer = NULL;
626
1047
char *decrypted_buffer = NULL;
627
1048
size_t buffer_length = 0;
630
1051
int retval = -1;
631
1052
gnutls_session_t session;
632
1053
int pf; /* Protocol family */
1054
bool route_added = false;
633
1055
634
1056
errno = 0;
635
1057
651
1073
return -1;
652
1074
}
653
1075
654
ret = init_gnutls_session(&session);
1076
/* If the interface is specified and we have a list of interfaces */
1077
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1078
/* Check if the interface is one of the interfaces we are using */
1079
bool match = false;
1080
{
1081
char *interface = NULL;
1082
while((interface = argz_next(mc->interfaces,
1083
mc->interfaces_size,
1084
interface))){
1085
if(if_nametoindex(interface) == (unsigned int)if_index){
1086
match = true;
1087
break;
1088
}
1089
}
1090
}
1091
if(not match){
1092
/* This interface does not match any in the list, so we don't
1093
connect to the server */
1094
if(debug){
1095
char interface[IF_NAMESIZE];
1096
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1097
perror_plus("if_indextoname");
1098
} else {
1099
fprintf_plus(stderr, "Skipping server on non-used interface"
1100
" \"%s\"\n",
1101
if_indextoname((unsigned int)if_index,
1102
interface));
1103
}
1104
}
1105
return -1;
1106
}
1107
}
1108
1109
ret = init_gnutls_session(&session, mc);
655
1110
if(ret != 0){
656
1111
return -1;
657
1112
}
658
1113
659
1114
if(debug){
660
1115
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
661
PRIu16 "\n", ip, port);
1116
PRIuMAX "\n", ip, (uintmax_t)port);
662
1117
}
663
1118
664
tcp_sd = socket(pf, SOCK_STREAM, 0);
1119
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
665
1120
if(tcp_sd < 0){
666
1121
int e = errno;
667
1122
perror_plus("socket");
674
1129
goto mandos_end;
675
1130
}
676
1131
677
memset(&to, 0, sizeof(to));
678
1132
if(af == AF_INET6){
679
to.in6.sin6_family = (sa_family_t)af;
680
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1133
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1134
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1135
ret = inet_pton(af, ip, &to6->sin6_addr);
681
1136
} else { /* IPv4 */
682
to.in.sin_family = (sa_family_t)af;
683
ret = inet_pton(af, ip, &to.in.sin_addr);
1137
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1138
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1139
ret = inet_pton(af, ip, &to4->sin_addr);
684
1140
}
685
1141
if(ret < 0 ){
686
1142
int e = errno;
695
1151
goto mandos_end;
696
1152
}
697
1153
if(af == AF_INET6){
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
699
-Wconversion and
700
-Wunreachable-code */
701
702
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
-Wunreachable-code*/
1154
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1155
if(IN6_IS_ADDR_LINKLOCAL
1156
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
705
1157
if(if_index == AVAHI_IF_UNSPEC){
706
1158
fprintf_plus(stderr, "An IPv6 link-local address is"
707
1159
" incomplete without a network interface\n");
709
1161
goto mandos_end;
710
1162
}
711
1163
/* Set the network interface number as scope */
712
to.in6.sin6_scope_id = (uint32_t)if_index;
1164
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
713
1165
}
714
1166
} else {
715
to.in.sin_port = htons(port); /* Spurious warnings from
716
-Wconversion and
717
-Wunreachable-code */
1167
((struct sockaddr_in *)&to)->sin_port = htons(port);
718
1168
}
719
1169
720
1170
if(quit_now){
728
1178
if(if_indextoname((unsigned int)if_index, interface) == NULL){
729
1179
perror_plus("if_indextoname");
730
1180
} else {
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
1181
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1182
"\n", ip, interface, (uintmax_t)port);
733
1183
}
734
1184
} else {
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
1185
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1186
ip, (uintmax_t)port);
737
1187
}
738
1188
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
739
1189
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
740
const char *pcret;
741
if(af == AF_INET6){
742
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
743
sizeof(addrstr));
744
} else {
745
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
746
sizeof(addrstr));
747
}
748
if(pcret == NULL){
749
perror_plus("inet_ntop");
750
} else {
751
if(strcmp(addrstr, ip) != 0){
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
753
}
754
}
755
}
756
757
if(quit_now){
758
errno = EINTR;
759
goto mandos_end;
760
}
761
762
if(af == AF_INET6){
763
ret = connect(tcp_sd, &to.in6, sizeof(to));
764
} else {
765
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
766
}
767
if(ret < 0){
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
int e = errno;
770
perror_plus("connect");
771
errno = e;
772
}
773
goto mandos_end;
774
}
775
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
1190
if(af == AF_INET6){
1191
ret = getnameinfo((struct sockaddr *)&to,
1192
sizeof(struct sockaddr_in6),
1193
addrstr, sizeof(addrstr), NULL, 0,
1194
NI_NUMERICHOST);
1195
} else {
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in),
1198
addrstr, sizeof(addrstr), NULL, 0,
1199
NI_NUMERICHOST);
1200
}
1201
if(ret == EAI_SYSTEM){
1202
perror_plus("getnameinfo");
1203
} else if(ret != 0) {
1204
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1205
} else if(strcmp(addrstr, ip) != 0){
1206
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1207
}
1208
}
1209
1210
if(quit_now){
1211
errno = EINTR;
1212
goto mandos_end;
1213
}
1214
1215
while(true){
1216
if(af == AF_INET6){
1217
ret = connect(tcp_sd, (struct sockaddr *)&to,
1218
sizeof(struct sockaddr_in6));
1219
} else {
1220
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1221
sizeof(struct sockaddr_in));
1222
}
1223
if(ret < 0){
1224
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1225
and if_index != AVAHI_IF_UNSPEC
1226
and connect_to == NULL
1227
and not route_added and
1228
((af == AF_INET6 and not
1229
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1230
&to)->sin6_addr)))
1231
or (af == AF_INET and
1232
/* Not a a IPv4LL address */
1233
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1234
& 0xFFFF0000L) != 0xA9FE0000L))){
1235
/* Work around Avahi bug - Avahi does not announce link-local
1236
addresses if it has a global address, so local hosts with
1237
*only* a link-local address (e.g. Mandos clients) cannot
1238
connect to a Mandos server announced by Avahi on a server
1239
host with a global address. Work around this by retrying
1240
with an explicit route added with the server's address.
1241
1242
Avahi bug reference:
1243
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://bugs.debian.org/587961
1245
*/
1246
if(debug){
1247
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
" direct route\n");
1249
}
1250
int e = errno;
1251
route_added = add_local_route(ip, if_index);
1252
if(route_added){
1253
continue;
1254
}
1255
errno = e;
1256
}
1257
if(errno != ECONNREFUSED or debug){
1258
int e = errno;
1259
perror_plus("connect");
1260
errno = e;
1261
}
1262
goto mandos_end;
1263
}
1264
1265
if(quit_now){
1266
errno = EINTR;
1267
goto mandos_end;
1268
}
1269
break;
779
1270
}
780
1271
781
1272
const char *out = mandos_protocol_version;
817
1308
goto mandos_end;
818
1309
}
819
1310
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1311
/* This casting via intptr_t is to eliminate warning about casting
1312
an int to a pointer type. This is exactly how the GnuTLS Guile
1313
function "set-session-transport-fd!" does it. */
1314
gnutls_transport_set_ptr(session,
1315
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
822
1316
823
1317
if(quit_now){
824
1318
errno = EINTR;
929
1423
if(buffer_length > 0){
930
1424
ssize_t decrypted_buffer_size;
931
1425
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
932
&decrypted_buffer);
1426
&decrypted_buffer, mc);
933
1427
if(decrypted_buffer_size >= 0){
934
1428
1429
clearerr(stdout);
935
1430
written = 0;
936
1431
while(written < (size_t) decrypted_buffer_size){
937
1432
if(quit_now){
953
1448
}
954
1449
written += (size_t)ret;
955
1450
}
1451
ret = fflush(stdout);
1452
if(ret != 0){
1453
int e = errno;
1454
if(debug){
1455
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1456
strerror(errno));
1457
}
1458
errno = e;
1459
goto mandos_end;
1460
}
956
1461
retval = 0;
957
1462
}
958
1463
}
961
1466
962
1467
mandos_end:
963
1468
{
1469
if(route_added){
1470
if(not delete_local_route(ip, if_index)){
1471
fprintf_plus(stderr, "Failed to delete local route to %s on"
1472
" interface %d", ip, if_index);
1473
}
1474
}
964
1475
int e = errno;
965
1476
free(decrypted_buffer);
966
1477
free(buffer);
967
1478
if(tcp_sd >= 0){
968
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1479
ret = close(tcp_sd);
969
1480
}
970
1481
if(ret == -1){
971
1482
if(e == 0){
983
1494
return retval;
984
1495
}
985
1496
1497
__attribute__((nonnull))
986
1498
static void resolve_callback(AvahiSServiceResolver *r,
987
1499
AvahiIfIndex interface,
988
1500
AvahiProtocol proto,
996
1508
AVAHI_GCC_UNUSED AvahiStringList *txt,
997
1509
AVAHI_GCC_UNUSED AvahiLookupResultFlags
998
1510
flags,
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1511
void *mc){
1512
if(r == NULL){
1513
return;
1514
}
1001
1515
1002
1516
/* Called whenever a service has been resolved successfully or
1003
1517
timed out */
1004
1518
1005
1519
if(quit_now){
1520
avahi_s_service_resolver_free(r);
1006
1521
return;
1007
1522
}
1008
1523
1012
1527
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1013
1528
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1014
1529
domain,
1015
avahi_strerror(avahi_server_errno(mc.server)));
1530
avahi_strerror(avahi_server_errno
1531
(((mandos_context*)mc)->server)));
1016
1532
break;
1017
1533
1018
1534
case AVAHI_RESOLVER_FOUND:
1024
1540
PRIdMAX ") on port %" PRIu16 "\n", name,
1025
1541
host_name, ip, (intmax_t)interface, port);
1026
1542
}
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1543
int ret = start_mandos_communication(ip, (in_port_t)port,
1544
interface,
1545
avahi_proto_to_af(proto),
1546
mc);
1029
1547
if(ret == 0){
1030
avahi_simple_poll_quit(mc.simple_poll);
1548
avahi_simple_poll_quit(simple_poll);
1031
1549
} else {
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1550
if(not add_server(ip, (in_port_t)port, interface,
1551
avahi_proto_to_af(proto),
1552
&((mandos_context*)mc)->current_server)){
1553
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1554
" list\n", name);
1555
}
1034
1556
}
1035
1557
}
1036
1558
}
1046
1568
const char *domain,
1047
1569
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1048
1570
flags,
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1571
void *mc){
1572
if(b == NULL){
1573
return;
1574
}
1051
1575
1052
1576
/* Called whenever a new services becomes available on the LAN or
1053
1577
is removed from the LAN */
1061
1585
case AVAHI_BROWSER_FAILURE:
1062
1586
1063
1587
fprintf_plus(stderr, "(Avahi browser) %s\n",
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
1588
avahi_strerror(avahi_server_errno
1589
(((mandos_context*)mc)->server)));
1590
avahi_simple_poll_quit(simple_poll);
1066
1591
return;
1067
1592
1068
1593
case AVAHI_BROWSER_NEW:
1071
1596
the callback function is called the Avahi server will free the
1072
1597
resolver for us. */
1073
1598
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1599
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1600
interface, protocol, name, type,
1601
domain, protocol, 0,
1602
resolve_callback, mc) == NULL)
1077
1603
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1078
1604
" %s\n", name,
1079
avahi_strerror(avahi_server_errno(mc.server)));
1605
avahi_strerror(avahi_server_errno
1606
(((mandos_context*)mc)->server)));
1080
1607
break;
1081
1608
1082
1609
case AVAHI_BROWSER_REMOVE:
1101
1628
signal_received = sig;
1102
1629
int old_errno = errno;
1103
1630
/* set main loop to exit */
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1631
if(simple_poll != NULL){
1632
avahi_simple_poll_quit(simple_poll);
1106
1633
}
1107
1634
errno = old_errno;
1108
1635
}
1109
1636
1637
__attribute__((nonnull, warn_unused_result))
1110
1638
bool get_flags(const char *ifname, struct ifreq *ifr){
1111
1639
int ret;
1640
int old_errno;
1112
1641
1113
1642
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1114
1643
if(s < 0){
1644
old_errno = errno;
1115
1645
perror_plus("socket");
1646
errno = old_errno;
1116
1647
return false;
1117
1648
}
1118
strcpy(ifr->ifr_name, ifname);
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1119
1651
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1120
1652
if(ret == -1){
1121
1653
if(debug){
1654
old_errno = errno;
1122
1655
perror_plus("ioctl SIOCGIFFLAGS");
1656
errno = old_errno;
1123
1657
}
1124
1658
return false;
1125
1659
}
1126
1660
return true;
1127
1661
}
1128
1662
1663
__attribute__((nonnull, warn_unused_result))
1129
1664
bool good_flags(const char *ifname, const struct ifreq *ifr){
1130
1665
1131
1666
/* Reject the loopback device */
1173
1708
* corresponds to an acceptable network device.
1174
1709
* (This function is passed to scandir(3) as a filter function.)
1175
1710
*/
1711
__attribute__((nonnull, warn_unused_result))
1176
1712
int good_interface(const struct dirent *if_entry){
1177
1713
if(if_entry->d_name[0] == '.'){
1178
1714
return 0;
1194
1730
}
1195
1731
1196
1732
/*
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1235
}
1236
return 1;
1237
}
1238
1733
* This function determines if a network interface is up.
1734
*/
1735
__attribute__((nonnull, warn_unused_result))
1736
bool interface_is_up(const char *interface){
1737
struct ifreq ifr;
1738
if(not get_flags(interface, &ifr)){
1739
if(debug){
1740
fprintf_plus(stderr, "Failed to get flags for interface "
1741
"\"%s\"\n", interface);
1742
}
1743
return false;
1744
}
1745
1746
return (bool)(ifr.ifr_flags & IFF_UP);
1747
}
1748
1749
/*
1750
* This function determines if a network interface is running
1751
*/
1752
__attribute__((nonnull, warn_unused_result))
1753
bool interface_is_running(const char *interface){
1754
struct ifreq ifr;
1755
if(not get_flags(interface, &ifr)){
1756
if(debug){
1757
fprintf_plus(stderr, "Failed to get flags for interface "
1758
"\"%s\"\n", interface);
1759
}
1760
return false;
1761
}
1762
1763
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1764
}
1765
1766
__attribute__((nonnull, pure, warn_unused_result))
1239
1767
int notdotentries(const struct dirent *direntry){
1240
1768
/* Skip "." and ".." */
1241
1769
if(direntry->d_name[0] == '.'
1248
1776
}
1249
1777
1250
1778
/* Is this directory entry a runnable program? */
1779
__attribute__((nonnull, warn_unused_result))
1251
1780
int runnable_hook(const struct dirent *direntry){
1252
1781
int ret;
1253
1782
size_t sret;
1261
1790
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1262
1791
"abcdefghijklmnopqrstuvwxyz"
1263
1792
"0123456789"
1264
"_-");
1793
"_.-");
1265
1794
if((direntry->d_name)[sret] != '\0'){
1266
1795
/* Contains non-allowed characters */
1267
1796
if(debug){
1271
1800
return 0;
1272
1801
}
1273
1802
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1276
if(ret < 0){
1277
perror_plus("asprintf");
1278
return 0;
1279
}
1280
1281
ret = stat(fullname, &st);
1803
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1282
1804
if(ret == -1){
1283
1805
if(debug){
1284
1806
perror_plus("Could not stat hook");
1301
1823
}
1302
1824
return 0;
1303
1825
}
1826
if(debug){
1827
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1828
direntry->d_name);
1829
}
1304
1830
return 1;
1305
1831
}
1306
1832
1307
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1833
__attribute__((nonnull, warn_unused_result))
1834
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1835
mandos_context *mc){
1308
1836
int ret;
1309
1837
struct timespec now;
1310
1838
struct timespec waited_time;
1311
1839
intmax_t block_time;
1312
1840
1313
1841
while(true){
1314
if(mc.current_server == NULL){
1315
if (debug){
1842
if(mc->current_server == NULL){
1843
if(debug){
1316
1844
fprintf_plus(stderr, "Wait until first server is found."
1317
1845
" No timeout!\n");
1318
1846
}
1319
1847
ret = avahi_simple_poll_iterate(s, -1);
1320
1848
} else {
1321
if (debug){
1849
if(debug){
1322
1850
fprintf_plus(stderr, "Check current_server if we should run"
1323
1851
" it, or wait\n");
1324
1852
}
1331
1859
/* Calculating in ms how long time between now and server
1332
1860
who we visted longest time ago. Now - last seen. */
1333
1861
waited_time.tv_sec = (now.tv_sec
1334
- mc.current_server->last_seen.tv_sec);
1862
- mc->current_server->last_seen.tv_sec);
1335
1863
waited_time.tv_nsec = (now.tv_nsec
1336
- mc.current_server->last_seen.tv_nsec);
1864
- mc->current_server->last_seen.tv_nsec);
1337
1865
/* total time is 10s/10,000ms.
1338
1866
Converting to s from ms by dividing by 1,000,
1339
1867
and ns to ms by dividing by 1,000,000. */
1341
1869
- ((intmax_t)waited_time.tv_sec * 1000))
1342
1870
- ((intmax_t)waited_time.tv_nsec / 1000000));
1343
1871
1344
if (debug){
1872
if(debug){
1345
1873
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1346
1874
block_time);
1347
1875
}
1348
1876
1349
1877
if(block_time <= 0){
1350
ret = start_mandos_communication(mc.current_server->ip,
1351
mc.current_server->port,
1352
mc.current_server->if_index,
1353
mc.current_server->af);
1878
ret = start_mandos_communication(mc->current_server->ip,
1879
mc->current_server->port,
1880
mc->current_server->if_index,
1881
mc->current_server->af, mc);
1354
1882
if(ret == 0){
1355
avahi_simple_poll_quit(mc.simple_poll);
1883
avahi_simple_poll_quit(s);
1356
1884
return 0;
1357
1885
}
1358
1886
ret = clock_gettime(CLOCK_MONOTONIC,
1359
&mc.current_server->last_seen);
1887
&mc->current_server->last_seen);
1360
1888
if(ret == -1){
1361
1889
perror_plus("clock_gettime");
1362
1890
return -1;
1363
1891
}
1364
mc.current_server = mc.current_server->next;
1892
mc->current_server = mc->current_server->next;
1365
1893
block_time = 0; /* Call avahi to find new Mandos
1366
1894
servers, but don't block */
1367
1895
}
1369
1897
ret = avahi_simple_poll_iterate(s, (int)block_time);
1370
1898
}
1371
1899
if(ret != 0){
1372
if (ret > 0 or errno != EINTR){
1900
if(ret > 0 or errno != EINTR){
1373
1901
return (ret != 1) ? ret : 0;
1374
1902
}
1375
1903
}
1376
1904
}
1377
1905
}
1378
1906
1379
bool run_network_hooks(const char *mode, const char *interface,
1907
__attribute__((nonnull))
1908
void run_network_hooks(const char *mode, const char *interface,
1380
1909
const float delay){
1381
struct dirent **direntries;
1382
struct dirent *direntry;
1383
int ret;
1384
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1385
alphasort);
1910
struct dirent **direntries = NULL;
1911
if(hookdir_fd == -1){
1912
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1913
| O_CLOEXEC);
1914
if(hookdir_fd == -1){
1915
if(errno == ENOENT){
1916
if(debug){
1917
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1918
" found\n", hookdir);
1919
}
1920
} else {
1921
perror_plus("open");
1922
}
1923
return;
1924
}
1925
}
1926
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1927
runnable_hook, alphasort);
1386
1928
if(numhooks == -1){
1387
1929
perror_plus("scandir");
1388
} else {
1389
int devnull = open("/dev/null", O_RDONLY);
1390
for(int i = 0; i < numhooks; i++){
1391
direntry = direntries[0];
1392
char *fullname = NULL;
1393
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1394
if(ret < 0){
1930
return;
1931
}
1932
struct dirent *direntry;
1933
int ret;
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1935
if(devnull == -1){
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
return;
1938
}
1939
for(int i = 0; i < numhooks; i++){
1940
direntry = direntries[i];
1941
if(debug){
1942
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1943
direntry->d_name);
1944
}
1945
pid_t hook_pid = fork();
1946
if(hook_pid == 0){
1947
/* Child */
1948
/* Raise privileges */
1949
errno = raise_privileges_permanently();
1950
if(errno != 0){
1951
perror_plus("Failed to raise privileges");
1952
_exit(EX_NOPERM);
1953
}
1954
/* Set group */
1955
errno = 0;
1956
ret = setgid(0);
1957
if(ret == -1){
1958
perror_plus("setgid");
1959
_exit(EX_NOPERM);
1960
}
1961
/* Reset supplementary groups */
1962
errno = 0;
1963
ret = setgroups(0, NULL);
1964
if(ret == -1){
1965
perror_plus("setgroups");
1966
_exit(EX_NOPERM);
1967
}
1968
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1969
if(ret == -1){
1970
perror_plus("setenv");
1971
_exit(EX_OSERR);
1972
}
1973
ret = setenv("DEVICE", interface, 1);
1974
if(ret == -1){
1975
perror_plus("setenv");
1976
_exit(EX_OSERR);
1977
}
1978
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1979
if(ret == -1){
1980
perror_plus("setenv");
1981
_exit(EX_OSERR);
1982
}
1983
ret = setenv("MODE", mode, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
char *delaystring;
1989
ret = asprintf(&delaystring, "%f", (double)delay);
1990
if(ret == -1){
1395
1991
perror_plus("asprintf");
1396
continue;
1992
_exit(EX_OSERR);
1397
1993
}
1398
pid_t hook_pid = fork();
1399
if(hook_pid == 0){
1400
/* Child */
1401
dup2(devnull, STDIN_FILENO);
1402
close(devnull);
1403
dup2(STDERR_FILENO, STDOUT_FILENO);
1404
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1405
if(ret == -1){
1406
perror_plus("setenv");
1407
return false;
1408
}
1409
ret = setenv("DEVICE", interface, 1);
1410
if(ret == -1){
1411
perror_plus("setenv");
1412
return false;
1413
}
1414
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1415
if(ret == -1){
1416
perror_plus("setenv");
1417
return false;
1418
}
1419
ret = setenv("MODE", mode, 1);
1420
if(ret == -1){
1421
perror_plus("setenv");
1422
return false;
1423
}
1424
char *delaystring;
1425
ret = asprintf(&delaystring, "%f", delay);
1426
if(ret == -1){
1427
perror_plus("asprintf");
1428
return false;
1429
}
1430
ret = setenv("DELAY", delaystring, 1);
1431
if(ret == -1){
1432
free(delaystring);
1433
perror_plus("setenv");
1434
return false;
1435
}
1994
ret = setenv("DELAY", delaystring, 1);
1995
if(ret == -1){
1436
1996
free(delaystring);
1437
ret = execl(fullname, direntry->d_name, mode, NULL);
1438
perror_plus("execl");
1439
} else {
1440
int status;
1441
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1442
perror_plus("waitpid");
1443
free(fullname);
1444
continue;
1445
}
1446
if(WIFEXITED(status)){
1447
if(WEXITSTATUS(status) != 0){
1448
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1449
" with status %d\n", direntry->d_name,
1450
WEXITSTATUS(status));
1451
free(fullname);
1452
continue;
1453
}
1454
} else if(WIFSIGNALED(status)){
1455
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1456
" signal %d\n", direntry->d_name,
1457
WTERMSIG(status));
1458
free(fullname);
1459
continue;
1460
} else {
1461
fprintf_plus(stderr, "Warning: network hook \"%s\""
1462
" crashed\n", direntry->d_name);
1463
free(fullname);
1464
continue;
1465
}
1466
}
1467
free(fullname);
1468
if(quit_now){
1469
break;
1470
}
1471
}
1472
close(devnull);
1473
}
1474
return true;
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
free(delaystring);
2001
if(connect_to != NULL){
2002
ret = setenv("CONNECT", connect_to, 1);
2003
if(ret == -1){
2004
perror_plus("setenv");
2005
_exit(EX_OSERR);
2006
}
2007
}
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
direntry->d_name,
2010
O_RDONLY));
2011
if(hook_fd == -1){
2012
perror_plus("openat");
2013
_exit(EXIT_FAILURE);
2014
}
2015
if(close(hookdir_fd) == -1){
2016
perror_plus("close");
2017
_exit(EXIT_FAILURE);
2018
}
2019
ret = dup2(devnull, STDIN_FILENO);
2020
if(ret == -1){
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
_exit(EX_OSERR);
2023
}
2024
ret = close(devnull);
2025
if(ret == -1){
2026
perror_plus("close");
2027
_exit(EX_OSERR);
2028
}
2029
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2030
if(ret == -1){
2031
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2032
_exit(EX_OSERR);
2033
}
2034
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2035
environ) == -1){
2036
perror_plus("fexecve");
2037
_exit(EXIT_FAILURE);
2038
}
2039
} else {
2040
if(hook_pid == -1){
2041
perror_plus("fork");
2042
free(direntry);
2043
continue;
2044
}
2045
int status;
2046
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2047
perror_plus("waitpid");
2048
free(direntry);
2049
continue;
2050
}
2051
if(WIFEXITED(status)){
2052
if(WEXITSTATUS(status) != 0){
2053
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2054
" with status %d\n", direntry->d_name,
2055
WEXITSTATUS(status));
2056
free(direntry);
2057
continue;
2058
}
2059
} else if(WIFSIGNALED(status)){
2060
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2061
" signal %d\n", direntry->d_name,
2062
WTERMSIG(status));
2063
free(direntry);
2064
continue;
2065
} else {
2066
fprintf_plus(stderr, "Warning: network hook \"%s\""
2067
" crashed\n", direntry->d_name);
2068
free(direntry);
2069
continue;
2070
}
2071
}
2072
if(debug){
2073
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2074
direntry->d_name);
2075
}
2076
free(direntry);
2077
}
2078
free(direntries);
2079
if(close(hookdir_fd) == -1){
2080
perror_plus("close");
2081
} else {
2082
hookdir_fd = -1;
2083
}
2084
close(devnull);
2085
}
2086
2087
__attribute__((nonnull, warn_unused_result))
2088
int bring_up_interface(const char *const interface,
2089
const float delay){
2090
int old_errno = errno;
2091
int ret;
2092
struct ifreq network;
2093
unsigned int if_index = if_nametoindex(interface);
2094
if(if_index == 0){
2095
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2096
errno = old_errno;
2097
return ENXIO;
2098
}
2099
2100
if(quit_now){
2101
errno = old_errno;
2102
return EINTR;
2103
}
2104
2105
if(not interface_is_up(interface)){
2106
int ret_errno = 0;
2107
int ioctl_errno = 0;
2108
if(not get_flags(interface, &network)){
2109
ret_errno = errno;
2110
fprintf_plus(stderr, "Failed to get flags for interface "
2111
"\"%s\"\n", interface);
2112
errno = old_errno;
2113
return ret_errno;
2114
}
2115
network.ifr_flags |= IFF_UP; /* set flag */
2116
2117
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2118
if(sd == -1){
2119
ret_errno = errno;
2120
perror_plus("socket");
2121
errno = old_errno;
2122
return ret_errno;
2123
}
2124
2125
if(quit_now){
2126
ret = close(sd);
2127
if(ret == -1){
2128
perror_plus("close");
2129
}
2130
errno = old_errno;
2131
return EINTR;
2132
}
2133
2134
if(debug){
2135
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2136
interface);
2137
}
2138
2139
/* Raise privileges */
2140
ret_errno = raise_privileges();
2141
if(ret_errno != 0){
2142
errno = ret_errno;
2143
perror_plus("Failed to raise privileges");
2144
}
2145
2146
#ifdef __linux__
2147
int ret_linux;
2148
bool restore_loglevel = false;
2149
if(ret_errno == 0){
2150
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2151
messages about the network interface to mess up the prompt */
2152
ret_linux = klogctl(8, NULL, 5);
2153
if(ret_linux == -1){
2154
perror_plus("klogctl");
2155
} else {
2156
restore_loglevel = true;
2157
}
2158
}
2159
#endif /* __linux__ */
2160
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2161
ioctl_errno = errno;
2162
#ifdef __linux__
2163
if(restore_loglevel){
2164
ret_linux = klogctl(7, NULL, 0);
2165
if(ret_linux == -1){
2166
perror_plus("klogctl");
2167
}
2168
}
2169
#endif /* __linux__ */
2170
2171
/* If raise_privileges() succeeded above */
2172
if(ret_errno == 0){
2173
/* Lower privileges */
2174
ret_errno = lower_privileges();
2175
if(ret_errno != 0){
2176
errno = ret_errno;
2177
perror_plus("Failed to lower privileges");
2178
}
2179
}
2180
2181
/* Close the socket */
2182
ret = close(sd);
2183
if(ret == -1){
2184
perror_plus("close");
2185
}
2186
2187
if(ret_setflags == -1){
2188
errno = ioctl_errno;
2189
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2190
errno = old_errno;
2191
return ioctl_errno;
2192
}
2193
} else if(debug){
2194
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2195
interface);
2196
}
2197
2198
/* Sleep checking until interface is running.
2199
Check every 0.25s, up to total time of delay */
2200
for(int i = 0; i < delay * 4; i++){
2201
if(interface_is_running(interface)){
2202
break;
2203
}
2204
struct timespec sleeptime = { .tv_nsec = 250000000 };
2205
ret = nanosleep(&sleeptime, NULL);
2206
if(ret == -1 and errno != EINTR){
2207
perror_plus("nanosleep");
2208
}
2209
}
2210
2211
errno = old_errno;
2212
return 0;
2213
}
2214
2215
__attribute__((nonnull, warn_unused_result))
2216
int take_down_interface(const char *const interface){
2217
int old_errno = errno;
2218
struct ifreq network;
2219
unsigned int if_index = if_nametoindex(interface);
2220
if(if_index == 0){
2221
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2222
errno = old_errno;
2223
return ENXIO;
2224
}
2225
if(interface_is_up(interface)){
2226
int ret_errno = 0;
2227
int ioctl_errno = 0;
2228
if(not get_flags(interface, &network) and debug){
2229
ret_errno = errno;
2230
fprintf_plus(stderr, "Failed to get flags for interface "
2231
"\"%s\"\n", interface);
2232
errno = old_errno;
2233
return ret_errno;
2234
}
2235
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2236
2237
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2238
if(sd == -1){
2239
ret_errno = errno;
2240
perror_plus("socket");
2241
errno = old_errno;
2242
return ret_errno;
2243
}
2244
2245
if(debug){
2246
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2247
interface);
2248
}
2249
2250
/* Raise privileges */
2251
ret_errno = raise_privileges();
2252
if(ret_errno != 0){
2253
errno = ret_errno;
2254
perror_plus("Failed to raise privileges");
2255
}
2256
2257
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2258
ioctl_errno = errno;
2259
2260
/* If raise_privileges() succeeded above */
2261
if(ret_errno == 0){
2262
/* Lower privileges */
2263
ret_errno = lower_privileges();
2264
if(ret_errno != 0){
2265
errno = ret_errno;
2266
perror_plus("Failed to lower privileges");
2267
}
2268
}
2269
2270
/* Close the socket */
2271
int ret = close(sd);
2272
if(ret == -1){
2273
perror_plus("close");
2274
}
2275
2276
if(ret_setflags == -1){
2277
errno = ioctl_errno;
2278
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2279
errno = old_errno;
2280
return ioctl_errno;
2281
}
2282
} else if(debug){
2283
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2284
interface);
2285
}
2286
2287
errno = old_errno;
2288
return 0;
1475
2289
}
1476
2290
1477
2291
int main(int argc, char *argv[]){
2292
mandos_context mc = { .server = NULL, .dh_bits = 0,
2293
.priority = "SECURE256:!CTYPE-X.509"
2294
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2295
.current_server = NULL, .interfaces = NULL,
2296
.interfaces_size = 0 };
1478
2297
AvahiSServiceBrowser *sb = NULL;
1479
int error;
2298
error_t ret_errno;
1480
2299
int ret;
1481
2300
intmax_t tmpmax;
1482
2301
char *tmp;
1483
2302
int exitcode = EXIT_SUCCESS;
1484
const char *interface = "";
1485
struct ifreq network;
1486
int sd = -1;
1487
bool take_down_interface = false;
1488
uid_t uid;
1489
gid_t gid;
1490
char tempdir[] = "/tmp/mandosXXXXXX";
1491
bool tempdir_created = false;
2303
char *interfaces_to_take_down = NULL;
2304
size_t interfaces_to_take_down_size = 0;
2305
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2306
char old_tempdir[] = "/tmp/mandosXXXXXX";
2307
char *tempdir = NULL;
1492
2308
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1493
2309
const char *seckey = PATHDIR "/" SECKEY;
1494
2310
const char *pubkey = PATHDIR "/" PUBKEY;
2311
const char *dh_params_file = NULL;
2312
char *interfaces_hooks = NULL;
1495
2313
1496
2314
bool gnutls_initialized = false;
1497
2315
bool gpgme_initialized = false;
1549
2367
.doc = "Bit length of the prime number used in the"
1550
2368
" Diffie-Hellman key exchange",
1551
2369
.group = 2 },
2370
{ .name = "dh-params", .key = 134,
2371
.arg = "FILE",
2372
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2373
" for the Diffie-Hellman key exchange",
2374
.group = 2 },
1552
2375
{ .name = "priority", .key = 130,
1553
2376
.arg = "STRING",
1554
2377
.doc = "GnuTLS priority string for the TLS handshake",
1559
2382
.group = 2 },
1560
2383
{ .name = "retry", .key = 132,
1561
2384
.arg = "SECONDS",
1562
.doc = "Retry interval used when denied by the mandos server",
2385
.doc = "Retry interval used when denied by the Mandos server",
1563
2386
.group = 2 },
1564
2387
{ .name = "network-hook-dir", .key = 133,
1565
2388
.arg = "DIR",
1588
2411
connect_to = arg;
1589
2412
break;
1590
2413
case 'i': /* --interface */
1591
interface = arg;
2414
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2415
arg, (int)',');
2416
if(ret_errno != 0){
2417
argp_error(state, "%s", strerror(ret_errno));
2418
}
1592
2419
break;
1593
2420
case 's': /* --seckey */
1594
2421
seckey = arg;
1605
2432
}
1606
2433
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1607
2434
break;
2435
case 134: /* --dh-params */
2436
dh_params_file = arg;
2437
break;
1608
2438
case 130: /* --priority */
1609
2439
mc.priority = arg;
1610
2440
break;
1637
2467
argp_state_help(state, state->out_stream,
1638
2468
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1639
2469
case 'V': /* --version */
1640
fprintf_plus(state->out_stream,
1641
"Mandos plugin mandos-client: ");
1642
2470
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1643
2471
exit(argp_err_exit_status);
1644
2472
break;
1652
2480
.args_doc = "",
1653
2481
.doc = "Mandos client -- Get and decrypt"
1654
2482
" passwords from a Mandos server" };
1655
ret = argp_parse(&argp, argc, argv,
1656
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1657
switch(ret){
2483
ret_errno = argp_parse(&argp, argc, argv,
2484
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2485
switch(ret_errno){
1658
2486
case 0:
1659
2487
break;
1660
2488
case ENOMEM:
1661
2489
default:
1662
errno = ret;
2490
errno = ret_errno;
1663
2491
perror_plus("argp_parse");
1664
2492
exitcode = EX_OSERR;
1665
2493
goto end;
1668
2496
goto end;
1669
2497
}
1670
2498
}
1671
2499
1672
2500
{
1673
2501
/* Work around Debian bug #633582:
1674
<http://bugs.debian.org/633582> */
1675
struct stat st;
1676
1677
/* Re-raise priviliges */
1678
errno = 0;
1679
ret = seteuid(0);
1680
if(ret == -1){
1681
perror_plus("seteuid");
1682
}
1683
1684
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1685
int seckey_fd = open(seckey, O_RDONLY);
1686
if(seckey_fd == -1){
1687
perror_plus("open");
1688
} else {
1689
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1690
if(ret == -1){
1691
perror_plus("fstat");
1692
} else {
1693
if(S_ISREG(st.st_mode)
1694
and st.st_uid == 0 and st.st_gid == 0){
1695
ret = fchown(seckey_fd, uid, gid);
1696
if(ret == -1){
1697
perror_plus("fchown");
1698
}
1699
}
1700
}
1701
TEMP_FAILURE_RETRY(close(seckey_fd));
1702
}
1703
}
1704
1705
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1706
int pubkey_fd = open(pubkey, O_RDONLY);
1707
if(pubkey_fd == -1){
1708
perror_plus("open");
1709
} else {
1710
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1711
if(ret == -1){
1712
perror_plus("fstat");
1713
} else {
1714
if(S_ISREG(st.st_mode)
1715
and st.st_uid == 0 and st.st_gid == 0){
1716
ret = fchown(pubkey_fd, uid, gid);
1717
if(ret == -1){
1718
perror_plus("fchown");
1719
}
1720
}
1721
}
1722
TEMP_FAILURE_RETRY(close(pubkey_fd));
1723
}
1724
}
1725
1726
/* Lower privileges */
1727
errno = 0;
1728
ret = seteuid(uid);
1729
if(ret == -1){
1730
perror_plus("seteuid");
2502
<https://bugs.debian.org/633582> */
2503
2504
/* Re-raise privileges */
2505
ret = raise_privileges();
2506
if(ret != 0){
2507
errno = ret;
2508
perror_plus("Failed to raise privileges");
2509
} else {
2510
struct stat st;
2511
2512
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2513
int seckey_fd = open(seckey, O_RDONLY);
2514
if(seckey_fd == -1){
2515
perror_plus("open");
2516
} else {
2517
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2518
if(ret == -1){
2519
perror_plus("fstat");
2520
} else {
2521
if(S_ISREG(st.st_mode)
2522
and st.st_uid == 0 and st.st_gid == 0){
2523
ret = fchown(seckey_fd, uid, gid);
2524
if(ret == -1){
2525
perror_plus("fchown");
2526
}
2527
}
2528
}
2529
close(seckey_fd);
2530
}
2531
}
2532
2533
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2534
int pubkey_fd = open(pubkey, O_RDONLY);
2535
if(pubkey_fd == -1){
2536
perror_plus("open");
2537
} else {
2538
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2539
if(ret == -1){
2540
perror_plus("fstat");
2541
} else {
2542
if(S_ISREG(st.st_mode)
2543
and st.st_uid == 0 and st.st_gid == 0){
2544
ret = fchown(pubkey_fd, uid, gid);
2545
if(ret == -1){
2546
perror_plus("fchown");
2547
}
2548
}
2549
}
2550
close(pubkey_fd);
2551
}
2552
}
2553
2554
if(dh_params_file != NULL
2555
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2556
int dhparams_fd = open(dh_params_file, O_RDONLY);
2557
if(dhparams_fd == -1){
2558
perror_plus("open");
2559
} else {
2560
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2561
if(ret == -1){
2562
perror_plus("fstat");
2563
} else {
2564
if(S_ISREG(st.st_mode)
2565
and st.st_uid == 0 and st.st_gid == 0){
2566
ret = fchown(dhparams_fd, uid, gid);
2567
if(ret == -1){
2568
perror_plus("fchown");
2569
}
2570
}
2571
}
2572
close(dhparams_fd);
2573
}
2574
}
2575
2576
/* Lower privileges */
2577
ret = lower_privileges();
2578
if(ret != 0){
2579
errno = ret;
2580
perror_plus("Failed to lower privileges");
2581
}
2582
}
2583
}
2584
2585
/* Remove invalid interface names (except "none") */
2586
{
2587
char *interface = NULL;
2588
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2589
interface))){
2590
if(strcmp(interface, "none") != 0
2591
and if_nametoindex(interface) == 0){
2592
if(interface[0] != '\0'){
2593
fprintf_plus(stderr, "Not using nonexisting interface"
2594
" \"%s\"\n", interface);
2595
}
2596
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2597
interface = NULL;
2598
}
1731
2599
}
1732
2600
}
1733
2601
1734
2602
/* Run network hooks */
1735
2603
{
1736
/* Re-raise priviliges */
1737
errno = 0;
1738
ret = seteuid(0);
1739
if(ret == -1){
1740
perror_plus("seteuid");
1741
}
1742
if(not run_network_hooks("start", interface, delay)){
1743
goto end;
1744
}
1745
/* Lower privileges */
1746
errno = 0;
1747
ret = seteuid(uid);
1748
if(ret == -1){
1749
perror_plus("seteuid");
1750
}
2604
if(mc.interfaces != NULL){
2605
interfaces_hooks = malloc(mc.interfaces_size);
2606
if(interfaces_hooks == NULL){
2607
perror_plus("malloc");
2608
goto end;
2609
}
2610
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2611
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2612
}
2613
run_network_hooks("start", interfaces_hooks != NULL ?
2614
interfaces_hooks : "", delay);
1751
2615
}
1752
2616
1753
2617
if(not debug){
1754
2618
avahi_set_log_function(empty_log);
1755
2619
}
1756
2620
1757
if(interface[0] == '\0'){
1758
struct dirent **direntries;
1759
/* First look for interfaces that are up */
1760
ret = scandir(sys_class_net, &direntries, up_interface,
1761
alphasort);
1762
if(ret == 0){
1763
/* No up interfaces, look for any good interfaces */
1764
free(direntries);
1765
ret = scandir(sys_class_net, &direntries, good_interface,
1766
alphasort);
1767
}
1768
if(ret >= 1){
1769
/* Pick the first interface returned */
1770
interface = strdup(direntries[0]->d_name);
1771
if(debug){
1772
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1773
}
1774
if(interface == NULL){
1775
perror_plus("malloc");
1776
free(direntries);
1777
exitcode = EXIT_FAILURE;
1778
goto end;
1779
}
1780
free(direntries);
1781
} else {
1782
free(direntries);
1783
fprintf_plus(stderr, "Could not find a network interface\n");
1784
exitcode = EXIT_FAILURE;
1785
goto end;
1786
}
1787
}
1788
1789
2621
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1790
2622
from the signal handler */
1791
2623
/* Initialize the pseudo-RNG for Avahi */
1792
2624
srand((unsigned int) time(NULL));
1793
mc.simple_poll = avahi_simple_poll_new();
1794
if(mc.simple_poll == NULL){
2625
simple_poll = avahi_simple_poll_new();
2626
if(simple_poll == NULL){
1795
2627
fprintf_plus(stderr,
1796
2628
"Avahi: Failed to create simple poll object.\n");
1797
2629
exitcode = EX_UNAVAILABLE;
1861
2693
}
1862
2694
}
1863
2695
1864
/* If the interface is down, bring it up */
1865
if(strcmp(interface, "none") != 0){
1866
if_index = (AvahiIfIndex) if_nametoindex(interface);
1867
if(if_index == 0){
1868
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1869
exitcode = EX_UNAVAILABLE;
1870
goto end;
1871
}
1872
1873
if(quit_now){
1874
goto end;
1875
}
1876
1877
/* Re-raise priviliges */
1878
errno = 0;
1879
ret = seteuid(0);
1880
if(ret == -1){
1881
perror_plus("seteuid");
1882
}
1883
1884
#ifdef __linux__
1885
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1886
messages about the network interface to mess up the prompt */
1887
ret = klogctl(8, NULL, 5);
1888
bool restore_loglevel = true;
1889
if(ret == -1){
1890
restore_loglevel = false;
1891
perror_plus("klogctl");
1892
}
1893
#endif /* __linux__ */
1894
1895
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1896
if(sd < 0){
1897
perror_plus("socket");
1898
exitcode = EX_OSERR;
1899
#ifdef __linux__
1900
if(restore_loglevel){
1901
ret = klogctl(7, NULL, 0);
1902
if(ret == -1){
1903
perror_plus("klogctl");
1904
}
1905
}
1906
#endif /* __linux__ */
1907
/* Lower privileges */
1908
errno = 0;
1909
ret = seteuid(uid);
1910
if(ret == -1){
1911
perror_plus("seteuid");
1912
}
1913
goto end;
1914
}
1915
strcpy(network.ifr_name, interface);
1916
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1917
if(ret == -1){
1918
perror_plus("ioctl SIOCGIFFLAGS");
1919
#ifdef __linux__
1920
if(restore_loglevel){
1921
ret = klogctl(7, NULL, 0);
1922
if(ret == -1){
1923
perror_plus("klogctl");
1924
}
1925
}
1926
#endif /* __linux__ */
1927
exitcode = EX_OSERR;
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1934
goto end;
1935
}
1936
if((network.ifr_flags & IFF_UP) == 0){
1937
network.ifr_flags |= IFF_UP;
1938
take_down_interface = true;
1939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1940
if(ret == -1){
1941
take_down_interface = false;
1942
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1943
exitcode = EX_OSERR;
1944
#ifdef __linux__
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1947
if(ret == -1){
1948
perror_plus("klogctl");
2696
/* If no interfaces were specified, make a list */
2697
if(mc.interfaces == NULL){
2698
struct dirent **direntries = NULL;
2699
/* Look for any good interfaces */
2700
ret = scandir(sys_class_net, &direntries, good_interface,
2701
alphasort);
2702
if(ret >= 1){
2703
/* Add all found interfaces to interfaces list */
2704
for(int i = 0; i < ret; ++i){
2705
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2706
direntries[i]->d_name);
2707
if(ret_errno != 0){
2708
errno = ret_errno;
2709
perror_plus("argz_add");
2710
free(direntries[i]);
2711
continue;
2712
}
2713
if(debug){
2714
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2715
direntries[i]->d_name);
2716
}
2717
free(direntries[i]);
2718
}
2719
free(direntries);
2720
} else {
2721
if(ret == 0){
2722
free(direntries);
2723
}
2724
fprintf_plus(stderr, "Could not find a network interface\n");
2725
exitcode = EXIT_FAILURE;
2726
goto end;
2727
}
2728
}
2729
2730
/* Bring up interfaces which are down, and remove any "none"s */
2731
{
2732
char *interface = NULL;
2733
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2734
interface))){
2735
/* If interface name is "none", stop bringing up interfaces.
2736
Also remove all instances of "none" from the list */
2737
if(strcmp(interface, "none") == 0){
2738
argz_delete(&mc.interfaces, &mc.interfaces_size,
2739
interface);
2740
interface = NULL;
2741
while((interface = argz_next(mc.interfaces,
2742
mc.interfaces_size, interface))){
2743
if(strcmp(interface, "none") == 0){
2744
argz_delete(&mc.interfaces, &mc.interfaces_size,
2745
interface);
2746
interface = NULL;
1949
2747
}
1950
2748
}
1951
#endif /* __linux__ */
1952
/* Lower privileges */
1953
errno = 0;
1954
ret = seteuid(uid);
1955
if(ret == -1){
1956
perror_plus("seteuid");
1957
}
1958
goto end;
1959
}
1960
}
1961
/* Sleep checking until interface is running.
1962
Check every 0.25s, up to total time of delay */
1963
for(int i=0; i < delay * 4; i++){
1964
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1965
if(ret == -1){
1966
perror_plus("ioctl SIOCGIFFLAGS");
1967
} else if(network.ifr_flags & IFF_RUNNING){
1968
2749
break;
1969
2750
}
1970
struct timespec sleeptime = { .tv_nsec = 250000000 };
1971
ret = nanosleep(&sleeptime, NULL);
1972
if(ret == -1 and errno != EINTR){
1973
perror_plus("nanosleep");
1974
}
1975
}
1976
if(not take_down_interface){
1977
/* We won't need the socket anymore */
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1982
}
1983
#ifdef __linux__
1984
if(restore_loglevel){
1985
/* Restores kernel loglevel to default */
1986
ret = klogctl(7, NULL, 0);
1987
if(ret == -1){
1988
perror_plus("klogctl");
1989
}
1990
}
1991
#endif /* __linux__ */
1992
/* Lower privileges */
1993
errno = 0;
1994
/* Lower privileges */
1995
ret = seteuid(uid);
1996
if(ret == -1){
1997
perror_plus("seteuid");
1998
}
2751
bool interface_was_up = interface_is_up(interface);
2752
errno = bring_up_interface(interface, delay);
2753
if(not interface_was_up){
2754
if(errno != 0){
2755
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2756
" %s\n", interface, strerror(errno));
2757
} else {
2758
errno = argz_add(&interfaces_to_take_down,
2759
&interfaces_to_take_down_size,
2760
interface);
2761
if(errno != 0){
2762
perror_plus("argz_add");
2763
}
2764
}
2765
}
2766
}
2767
if(debug and (interfaces_to_take_down == NULL)){
2768
fprintf_plus(stderr, "No interfaces were brought up\n");
2769
}
2770
}
2771
2772
/* If we only got one interface, explicitly use only that one */
2773
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2774
if(debug){
2775
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2776
mc.interfaces);
2777
}
2778
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1999
2779
}
2000
2780
2001
2781
if(quit_now){
2002
2782
goto end;
2003
2783
}
2004
2784
2005
ret = init_gnutls_global(pubkey, seckey);
2785
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2006
2786
if(ret == -1){
2007
2787
fprintf_plus(stderr, "init_gnutls_global failed\n");
2008
2788
exitcode = EX_UNAVAILABLE;
2015
2795
goto end;
2016
2796
}
2017
2797
2018
if(mkdtemp(tempdir) == NULL){
2798
/* Try /run/tmp before /tmp */
2799
tempdir = mkdtemp(run_tempdir);
2800
if(tempdir == NULL and errno == ENOENT){
2801
if(debug){
2802
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2803
run_tempdir, old_tempdir);
2804
}
2805
tempdir = mkdtemp(old_tempdir);
2806
}
2807
if(tempdir == NULL){
2019
2808
perror_plus("mkdtemp");
2020
2809
goto end;
2021
2810
}
2022
tempdir_created = true;
2023
2811
2024
2812
if(quit_now){
2025
2813
goto end;
2026
2814
}
2027
2815
2028
if(not init_gpgme(pubkey, seckey, tempdir)){
2816
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2029
2817
fprintf_plus(stderr, "init_gpgme failed\n");
2030
2818
exitcode = EX_UNAVAILABLE;
2031
2819
goto end;
2041
2829
/* Connect directly, do not use Zeroconf */
2042
2830
/* (Mainly meant for debugging) */
2043
2831
char *address = strrchr(connect_to, ':');
2832
2044
2833
if(address == NULL){
2045
2834
fprintf_plus(stderr, "No colon in address\n");
2046
2835
exitcode = EX_USAGE;
2051
2840
goto end;
2052
2841
}
2053
2842
2054
uint16_t port;
2843
in_port_t port;
2055
2844
errno = 0;
2056
2845
tmpmax = strtoimax(address+1, &tmp, 10);
2057
2846
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2058
or tmpmax != (uint16_t)tmpmax){
2847
or tmpmax != (in_port_t)tmpmax){
2059
2848
fprintf_plus(stderr, "Bad port number\n");
2060
2849
exitcode = EX_USAGE;
2061
2850
goto end;
2062
2851
}
2063
2852
2064
2853
if(quit_now){
2065
2854
goto end;
2066
2855
}
2067
2856
2068
port = (uint16_t)tmpmax;
2857
port = (in_port_t)tmpmax;
2069
2858
*address = '\0';
2070
2859
/* Colon in address indicates IPv6 */
2071
2860
int af;
2087
2876
}
2088
2877
2089
2878
while(not quit_now){
2090
ret = start_mandos_communication(address, port, if_index, af);
2879
ret = start_mandos_communication(address, port, if_index, af,
2880
&mc);
2091
2881
if(quit_now or ret == 0){
2092
2882
break;
2093
2883
}
2095
2885
fprintf_plus(stderr, "Retrying in %d seconds\n",
2096
2886
(int)retry_interval);
2097
2887
}
2098
sleep((int)retry_interval);
2888
sleep((unsigned int)retry_interval);
2099
2889
}
2100
2890
2101
if (not quit_now){
2891
if(not quit_now){
2102
2892
exitcode = EXIT_SUCCESS;
2103
2893
}
2104
2894
2119
2909
config.publish_domain = 0;
2120
2910
2121
2911
/* Allocate a new server */
2122
mc.server = avahi_server_new(avahi_simple_poll_get
2123
(mc.simple_poll), &config, NULL,
2124
NULL, &error);
2912
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2913
&config, NULL, NULL, &ret);
2125
2914
2126
2915
/* Free the Avahi configuration data */
2127
2916
avahi_server_config_free(&config);
2130
2919
/* Check if creating the Avahi server object succeeded */
2131
2920
if(mc.server == NULL){
2132
2921
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2133
avahi_strerror(error));
2922
avahi_strerror(ret));
2134
2923
exitcode = EX_UNAVAILABLE;
2135
2924
goto end;
2136
2925
}
2142
2931
/* Create the Avahi service browser */
2143
2932
sb = avahi_s_service_browser_new(mc.server, if_index,
2144
2933
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2145
NULL, 0, browse_callback, NULL);
2934
NULL, 0, browse_callback,
2935
(void *)&mc);
2146
2936
if(sb == NULL){
2147
2937
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2148
2938
avahi_strerror(avahi_server_errno(mc.server)));
2159
2949
if(debug){
2160
2950
fprintf_plus(stderr, "Starting Avahi loop search\n");
2161
2951
}
2162
2163
ret = avahi_loop_with_timeout(mc.simple_poll,
2164
(int)(retry_interval * 1000));
2952
2953
ret = avahi_loop_with_timeout(simple_poll,
2954
(int)(retry_interval * 1000), &mc);
2165
2955
if(debug){
2166
2956
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2167
2957
(ret == 0) ? "successfully" : "with error");
2170
2960
end:
2171
2961
2172
2962
if(debug){
2173
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2963
if(signal_received){
2964
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2965
argv[0], signal_received,
2966
strsignal(signal_received));
2967
} else {
2968
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
}
2174
2970
}
2175
2971
2176
2972
/* Cleanup things */
2973
free(mc.interfaces);
2974
2177
2975
if(sb != NULL)
2178
2976
avahi_s_service_browser_free(sb);
2179
2977
2180
2978
if(mc.server != NULL)
2181
2979
avahi_server_free(mc.server);
2182
2980
2183
if(mc.simple_poll != NULL)
2184
avahi_simple_poll_free(mc.simple_poll);
2981
if(simple_poll != NULL)
2982
avahi_simple_poll_free(simple_poll);
2185
2983
2186
2984
if(gnutls_initialized){
2187
2985
gnutls_certificate_free_credentials(mc.cred);
2188
gnutls_global_deinit();
2189
2986
gnutls_dh_params_deinit(mc.dh_params);
2190
2987
}
2191
2988
2192
2989
if(gpgme_initialized){
2193
2990
gpgme_release(mc.ctx);
2194
2991
}
2195
2992
2196
2993
/* Cleans up the circular linked list of Mandos servers the client
2197
2994
has seen */
2198
2995
if(mc.current_server != NULL){
2199
2996
mc.current_server->prev->next = NULL;
2200
2997
while(mc.current_server != NULL){
2201
2998
server *next = mc.current_server->next;
2999
#ifdef __GNUC__
3000
#pragma GCC diagnostic push
3001
#pragma GCC diagnostic ignored "-Wcast-qual"
3002
#endif
3003
free((char *)(mc.current_server->ip));
3004
#ifdef __GNUC__
3005
#pragma GCC diagnostic pop
3006
#endif
2202
3007
free(mc.current_server);
2203
3008
mc.current_server = next;
2204
3009
}
2205
3010
}
2206
3011
2207
/* Re-raise priviliges */
3012
/* Re-raise privileges */
2208
3013
{
2209
errno = 0;
2210
ret = seteuid(0);
2211
if(ret == -1){
2212
perror_plus("seteuid");
2213
}
2214
/* Run network hooks */
2215
if(not run_network_hooks("stop", interface, delay)){
2216
goto end;
3014
ret = raise_privileges();
3015
if(ret != 0){
3016
errno = ret;
3017
perror_plus("Failed to raise privileges");
3018
} else {
3019
3020
/* Run network hooks */
3021
run_network_hooks("stop", interfaces_hooks != NULL ?
3022
interfaces_hooks : "", delay);
3023
3024
/* Take down the network interfaces which were brought up */
3025
{
3026
char *interface = NULL;
3027
while((interface = argz_next(interfaces_to_take_down,
3028
interfaces_to_take_down_size,
3029
interface))){
3030
ret = take_down_interface(interface);
3031
if(ret != 0){
3032
errno = ret;
3033
perror_plus("Failed to take down interface");
3034
}
3035
}
3036
if(debug and (interfaces_to_take_down == NULL)){
3037
fprintf_plus(stderr, "No interfaces needed to be taken"
3038
" down\n");
3039
}
3040
}
2217
3041
}
2218
3042
2219
/* Take down the network interface */
2220
if(take_down_interface and geteuid() == 0){
2221
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2222
if(ret == -1){
2223
perror_plus("ioctl SIOCGIFFLAGS");
2224
} else if(network.ifr_flags & IFF_UP){
2225
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2226
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2227
if(ret == -1){
2228
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2229
}
2230
}
2231
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2232
if(ret == -1){
2233
perror_plus("close");
2234
}
3043
ret = lower_privileges_permanently();
3044
if(ret != 0){
3045
errno = ret;
3046
perror_plus("Failed to lower privileges permanently");
2235
3047
}
2236
3048
}
2237
/* Lower privileges permanently */
2238
errno = 0;
2239
ret = setuid(uid);
2240
if(ret == -1){
2241
perror_plus("setuid");
3049
3050
free(interfaces_to_take_down);
3051
free(interfaces_hooks);
3052
3053
void clean_dir_at(int base, const char * const dirname,
3054
uintmax_t level){
3055
struct dirent **direntries = NULL;
3056
int dret;
3057
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3058
O_RDONLY
3059
| O_NOFOLLOW
3060
| O_DIRECTORY
3061
| O_PATH));
3062
if(dir_fd == -1){
3063
perror_plus("open");
3064
}
3065
int numentries = scandirat(dir_fd, ".", &direntries,
3066
notdotentries, alphasort);
3067
if(numentries >= 0){
3068
for(int i = 0; i < numentries; i++){
3069
if(debug){
3070
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3071
dirname, direntries[i]->d_name);
3072
}
3073
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3074
if(dret == -1){
3075
if(errno == EISDIR){
3076
dret = unlinkat(dir_fd, direntries[i]->d_name,
3077
AT_REMOVEDIR);
3078
}
3079
if((dret == -1) and (errno == ENOTEMPTY)
3080
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3081
== 0) and (level == 0)){
3082
/* Recurse only in this special case */
3083
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3084
dret = 0;
3085
}
3086
if(dret == -1){
3087
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3088
direntries[i]->d_name, strerror(errno));
3089
}
3090
}
3091
free(direntries[i]);
3092
}
3093
3094
/* need to clean even if 0 because man page doesn't specify */
3095
free(direntries);
3096
if(numentries == -1){
3097
perror_plus("scandirat");
3098
}
3099
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3100
if(dret == -1 and errno != ENOENT){
3101
perror_plus("rmdir");
3102
}
3103
} else {
3104
perror_plus("scandirat");
3105
}
3106
close(dir_fd);
2242
3107
}
2243
3108
2244
3109
/* Removes the GPGME temp directory and all files inside */
2245
if(tempdir_created){
2246
struct dirent **direntries = NULL;
2247
struct dirent *direntry = NULL;
2248
int numentries = scandir(tempdir, &direntries, notdotentries,
2249
alphasort);
2250
if (numentries > 0){
2251
for(int i = 0; i < numentries; i++){
2252
direntry = direntries[i];
2253
char *fullname = NULL;
2254
ret = asprintf(&fullname, "%s/%s", tempdir,
2255
direntry->d_name);
2256
if(ret < 0){
2257
perror_plus("asprintf");
2258
continue;
2259
}
2260
ret = remove(fullname);
2261
if(ret == -1){
2262
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2263
strerror(errno));
2264
}
2265
free(fullname);
2266
}
2267
}
2268
2269
/* need to clean even if 0 because man page doesn't specify */
2270
free(direntries);
2271
if (numentries == -1){
2272
perror_plus("scandir");
2273
}
2274
ret = rmdir(tempdir);
2275
if(ret == -1 and errno != ENOENT){
2276
perror_plus("rmdir");
2277
}
3110
if(tempdir != NULL){
3111
clean_dir_at(-1, tempdir, 0);
2278
3112
}
2279
3113
2280
3114
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0