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- Committer: Teddy Hogeborn
- Date: 2016-08-26 18:44:21 UTC
- Revision ID: teddy@recompile.se-20160826184421-gjqjgzxy3lupx9n3
Fix bug where mandos server could not find GnuTLS library
* mandos (GnuTLS): Try to find both "gnutls" and variant name
"gnutls-deb0", for a Debian Jessie system which
does not have the package "gnutls28-dev" installed.
* mandos (GnuTLS): Try to find both "gnutls" and variant name
"gnutls-deb0", for a Debian Jessie system which
does not have the package "gnutls28-dev" installed.
- files added:
- bugs.xml
- debian/upstream
- network-hooks.d
- 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
} while(false);
630
}
631
if(dhparamsfilename == NULL){
632
if(mc->dh_bits == 0){
633
/* Find out the optimal number of DH bits */
634
/* Try to read the private key file */
635
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
636
do {
637
int secfile = open(seckeyfilename, O_RDONLY);
638
if(secfile == -1){
639
perror_plus("open");
640
break;
641
}
642
size_t buffer_capacity = 0;
643
while(true){
644
buffer_capacity = incbuffer((char **)&buffer.data,
645
(size_t)buffer.size,
646
(size_t)buffer_capacity);
647
if(buffer_capacity == 0){
648
perror_plus("incbuffer");
649
free(buffer.data);
650
buffer.data = NULL;
651
break;
652
}
653
ssize_t bytes_read = read(secfile,
654
buffer.data + buffer.size,
655
BUFFER_SIZE);
656
/* EOF */
657
if(bytes_read == 0){
658
break;
659
}
660
/* check bytes_read for failure */
661
if(bytes_read < 0){
662
perror_plus("read");
663
free(buffer.data);
664
buffer.data = NULL;
665
break;
666
}
667
buffer.size += (unsigned int)bytes_read;
668
}
669
close(secfile);
670
} while(false);
671
/* If successful, use buffer to parse private key */
672
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
673
if(buffer.data != NULL){
674
{
675
gnutls_openpgp_privkey_t privkey = NULL;
676
ret = gnutls_openpgp_privkey_init(&privkey);
677
if(ret != GNUTLS_E_SUCCESS){
678
fprintf_plus(stderr, "Error initializing OpenPGP key"
679
" structure: %s",
680
safer_gnutls_strerror(ret));
681
free(buffer.data);
682
buffer.data = NULL;
683
} else {
684
ret = gnutls_openpgp_privkey_import
685
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
686
if(ret != GNUTLS_E_SUCCESS){
687
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
688
safer_gnutls_strerror(ret));
689
privkey = NULL;
690
}
691
free(buffer.data);
692
buffer.data = NULL;
693
if(privkey != NULL){
694
/* Use private key to suggest an appropriate
695
sec_param */
696
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
697
gnutls_openpgp_privkey_deinit(privkey);
698
if(debug){
699
fprintf_plus(stderr, "This OpenPGP key implies using"
700
" a GnuTLS security parameter \"%s\".\n",
701
safe_string(gnutls_sec_param_get_name
702
(sec_param)));
703
}
704
}
705
}
706
}
707
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
708
/* Err on the side of caution */
709
sec_param = GNUTLS_SEC_PARAM_ULTRA;
710
if(debug){
711
fprintf_plus(stderr, "Falling back to security parameter"
712
" \"%s\"\n",
713
safe_string(gnutls_sec_param_get_name
714
(sec_param)));
715
}
716
}
717
}
718
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
719
if(uret != 0){
720
mc->dh_bits = uret;
721
if(debug){
722
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
723
" implies %u DH bits; using that.\n",
724
safe_string(gnutls_sec_param_get_name
725
(sec_param)),
726
mc->dh_bits);
727
}
728
} else {
729
fprintf_plus(stderr, "Failed to get implied number of DH"
730
" bits for security parameter \"%s\"): %s\n",
731
safe_string(gnutls_sec_param_get_name
732
(sec_param)),
733
safer_gnutls_strerror(ret));
734
goto globalfail;
735
}
736
} else if(debug){
737
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
738
mc->dh_bits);
739
}
740
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
741
if(ret != GNUTLS_E_SUCCESS){
742
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
743
" bits): %s\n", mc->dh_bits,
744
safer_gnutls_strerror(ret));
745
goto globalfail;
746
}
747
}
748
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
749
545
750
return 0;
546
751
547
752
globalfail:
548
753
549
gnutls_certificate_free_credentials(mc.cred);
550
gnutls_global_deinit();
551
gnutls_dh_params_deinit(mc.dh_params);
754
gnutls_certificate_free_credentials(mc->cred);
755
gnutls_dh_params_deinit(mc->dh_params);
552
756
return -1;
553
757
}
554
758
555
static int init_gnutls_session(gnutls_session_t *session){
759
__attribute__((nonnull, warn_unused_result))
760
static int init_gnutls_session(gnutls_session_t *session,
761
mandos_context *mc){
556
762
int ret;
557
763
/* GnuTLS session creation */
558
764
do {
570
776
{
571
777
const char *err;
572
778
do {
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
779
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
780
if(quit_now){
575
781
gnutls_deinit(*session);
576
782
return -1;
587
793
588
794
do {
589
795
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
590
mc.cred);
796
mc->cred);
591
797
if(quit_now){
592
798
gnutls_deinit(*session);
593
799
return -1;
603
809
/* ignore client certificate if any. */
604
810
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
605
811
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
607
608
812
return 0;
609
813
}
610
814
612
816
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
613
817
__attribute__((unused)) const char *txt){}
614
818
819
/* Set effective uid to 0, return errno */
820
__attribute__((warn_unused_result))
821
int raise_privileges(void){
822
int old_errno = errno;
823
int ret = 0;
824
if(seteuid(0) == -1){
825
ret = errno;
826
}
827
errno = old_errno;
828
return ret;
829
}
830
831
/* Set effective and real user ID to 0. Return errno. */
832
__attribute__((warn_unused_result))
833
int raise_privileges_permanently(void){
834
int old_errno = errno;
835
int ret = raise_privileges();
836
if(ret != 0){
837
errno = old_errno;
838
return ret;
839
}
840
if(setuid(0) == -1){
841
ret = errno;
842
}
843
errno = old_errno;
844
return ret;
845
}
846
847
/* Set effective user ID to unprivileged saved user ID */
848
__attribute__((warn_unused_result))
849
int lower_privileges(void){
850
int old_errno = errno;
851
int ret = 0;
852
if(seteuid(uid) == -1){
853
ret = errno;
854
}
855
errno = old_errno;
856
return ret;
857
}
858
859
/* Lower privileges permanently */
860
__attribute__((warn_unused_result))
861
int lower_privileges_permanently(void){
862
int old_errno = errno;
863
int ret = 0;
864
if(setuid(uid) == -1){
865
ret = errno;
866
}
867
errno = old_errno;
868
return ret;
869
}
870
871
/* Helper function to add_local_route() and delete_local_route() */
872
__attribute__((nonnull, warn_unused_result))
873
static bool add_delete_local_route(const bool add,
874
const char *address,
875
AvahiIfIndex if_index){
876
int ret;
877
char helper[] = "mandos-client-iprouteadddel";
878
char add_arg[] = "add";
879
char delete_arg[] = "delete";
880
char debug_flag[] = "--debug";
881
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
882
if(pluginhelperdir == NULL){
883
if(debug){
884
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
885
" variable not set; cannot run helper\n");
886
}
887
return false;
888
}
889
890
char interface[IF_NAMESIZE];
891
if(if_indextoname((unsigned int)if_index, interface) == NULL){
892
perror_plus("if_indextoname");
893
return false;
894
}
895
896
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
897
if(devnull == -1){
898
perror_plus("open(\"/dev/null\", O_RDONLY)");
899
return false;
900
}
901
pid_t pid = fork();
902
if(pid == 0){
903
/* Child */
904
/* Raise privileges */
905
errno = raise_privileges_permanently();
906
if(errno != 0){
907
perror_plus("Failed to raise privileges");
908
/* _exit(EX_NOPERM); */
909
} else {
910
/* Set group */
911
errno = 0;
912
ret = setgid(0);
913
if(ret == -1){
914
perror_plus("setgid");
915
_exit(EX_NOPERM);
916
}
917
/* Reset supplementary groups */
918
errno = 0;
919
ret = setgroups(0, NULL);
920
if(ret == -1){
921
perror_plus("setgroups");
922
_exit(EX_NOPERM);
923
}
924
}
925
ret = dup2(devnull, STDIN_FILENO);
926
if(ret == -1){
927
perror_plus("dup2(devnull, STDIN_FILENO)");
928
_exit(EX_OSERR);
929
}
930
ret = close(devnull);
931
if(ret == -1){
932
perror_plus("close");
933
_exit(EX_OSERR);
934
}
935
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
936
if(ret == -1){
937
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
938
_exit(EX_OSERR);
939
}
940
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
941
O_RDONLY
942
| O_DIRECTORY
943
| O_PATH
944
| O_CLOEXEC));
945
if(helperdir_fd == -1){
946
perror_plus("open");
947
_exit(EX_UNAVAILABLE);
948
}
949
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
950
helper, O_RDONLY));
951
if(helper_fd == -1){
952
perror_plus("openat");
953
close(helperdir_fd);
954
_exit(EX_UNAVAILABLE);
955
}
956
close(helperdir_fd);
957
#ifdef __GNUC__
958
#pragma GCC diagnostic push
959
#pragma GCC diagnostic ignored "-Wcast-qual"
960
#endif
961
if(fexecve(helper_fd, (char *const [])
962
{ helper, add ? add_arg : delete_arg, (char *)address,
963
interface, debug ? debug_flag : NULL, NULL },
964
environ) == -1){
965
#ifdef __GNUC__
966
#pragma GCC diagnostic pop
967
#endif
968
perror_plus("fexecve");
969
_exit(EXIT_FAILURE);
970
}
971
}
972
if(pid == -1){
973
perror_plus("fork");
974
return false;
975
}
976
int status;
977
pid_t pret = -1;
978
errno = 0;
979
do {
980
pret = waitpid(pid, &status, 0);
981
if(pret == -1 and errno == EINTR and quit_now){
982
int errno_raising = 0;
983
if((errno = raise_privileges()) != 0){
984
errno_raising = errno;
985
perror_plus("Failed to raise privileges in order to"
986
" kill helper program");
987
}
988
if(kill(pid, SIGTERM) == -1){
989
perror_plus("kill");
990
}
991
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
992
perror_plus("Failed to lower privileges after killing"
993
" helper program");
994
}
995
return false;
996
}
997
} while(pret == -1 and errno == EINTR);
998
if(pret == -1){
999
perror_plus("waitpid");
1000
return false;
1001
}
1002
if(WIFEXITED(status)){
1003
if(WEXITSTATUS(status) != 0){
1004
fprintf_plus(stderr, "Error: iprouteadddel exited"
1005
" with status %d\n", WEXITSTATUS(status));
1006
return false;
1007
}
1008
return true;
1009
}
1010
if(WIFSIGNALED(status)){
1011
fprintf_plus(stderr, "Error: iprouteadddel died by"
1012
" signal %d\n", WTERMSIG(status));
1013
return false;
1014
}
1015
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1016
return false;
1017
}
1018
1019
__attribute__((nonnull, warn_unused_result))
1020
static bool add_local_route(const char *address,
1021
AvahiIfIndex if_index){
1022
if(debug){
1023
fprintf_plus(stderr, "Adding route to %s\n", address);
1024
}
1025
return add_delete_local_route(true, address, if_index);
1026
}
1027
1028
__attribute__((nonnull, warn_unused_result))
1029
static bool delete_local_route(const char *address,
1030
AvahiIfIndex if_index){
1031
if(debug){
1032
fprintf_plus(stderr, "Removing route to %s\n", address);
1033
}
1034
return add_delete_local_route(false, address, if_index);
1035
}
1036
615
1037
/* Called when a Mandos server is found */
616
static int start_mandos_communication(const char *ip, uint16_t port,
1038
__attribute__((nonnull, warn_unused_result))
1039
static int start_mandos_communication(const char *ip, in_port_t port,
617
1040
AvahiIfIndex if_index,
618
int af){
1041
int af, mandos_context *mc){
619
1042
int ret, tcp_sd = -1;
620
1043
ssize_t sret;
621
union {
622
struct sockaddr_in in;
623
struct sockaddr_in6 in6;
624
} to;
1044
struct sockaddr_storage to;
625
1045
char *buffer = NULL;
626
1046
char *decrypted_buffer = NULL;
627
1047
size_t buffer_length = 0;
630
1050
int retval = -1;
631
1051
gnutls_session_t session;
632
1052
int pf; /* Protocol family */
1053
bool route_added = false;
633
1054
634
1055
errno = 0;
635
1056
651
1072
return -1;
652
1073
}
653
1074
654
ret = init_gnutls_session(&session);
1075
/* If the interface is specified and we have a list of interfaces */
1076
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1077
/* Check if the interface is one of the interfaces we are using */
1078
bool match = false;
1079
{
1080
char *interface = NULL;
1081
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1082
interface))){
1083
if(if_nametoindex(interface) == (unsigned int)if_index){
1084
match = true;
1085
break;
1086
}
1087
}
1088
}
1089
if(not match){
1090
/* This interface does not match any in the list, so we don't
1091
connect to the server */
1092
if(debug){
1093
char interface[IF_NAMESIZE];
1094
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1095
perror_plus("if_indextoname");
1096
} else {
1097
fprintf_plus(stderr, "Skipping server on non-used interface"
1098
" \"%s\"\n",
1099
if_indextoname((unsigned int)if_index,
1100
interface));
1101
}
1102
}
1103
return -1;
1104
}
1105
}
1106
1107
ret = init_gnutls_session(&session, mc);
655
1108
if(ret != 0){
656
1109
return -1;
657
1110
}
658
1111
659
1112
if(debug){
660
1113
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
661
PRIu16 "\n", ip, port);
1114
PRIuMAX "\n", ip, (uintmax_t)port);
662
1115
}
663
1116
664
tcp_sd = socket(pf, SOCK_STREAM, 0);
1117
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
665
1118
if(tcp_sd < 0){
666
1119
int e = errno;
667
1120
perror_plus("socket");
674
1127
goto mandos_end;
675
1128
}
676
1129
677
memset(&to, 0, sizeof(to));
678
1130
if(af == AF_INET6){
679
to.in6.sin6_family = (sa_family_t)af;
680
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1131
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1132
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1133
ret = inet_pton(af, ip, &to6->sin6_addr);
681
1134
} else { /* IPv4 */
682
to.in.sin_family = (sa_family_t)af;
683
ret = inet_pton(af, ip, &to.in.sin_addr);
1135
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1136
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to4->sin_addr);
684
1138
}
685
1139
if(ret < 0 ){
686
1140
int e = errno;
695
1149
goto mandos_end;
696
1150
}
697
1151
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*/
1152
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1153
if(IN6_IS_ADDR_LINKLOCAL
1154
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
705
1155
if(if_index == AVAHI_IF_UNSPEC){
706
1156
fprintf_plus(stderr, "An IPv6 link-local address is"
707
1157
" incomplete without a network interface\n");
709
1159
goto mandos_end;
710
1160
}
711
1161
/* Set the network interface number as scope */
712
to.in6.sin6_scope_id = (uint32_t)if_index;
1162
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
713
1163
}
714
1164
} else {
715
to.in.sin_port = htons(port); /* Spurious warnings from
716
-Wconversion and
717
-Wunreachable-code */
1165
((struct sockaddr_in *)&to)->sin_port = htons(port);
718
1166
}
719
1167
720
1168
if(quit_now){
728
1176
if(if_indextoname((unsigned int)if_index, interface) == NULL){
729
1177
perror_plus("if_indextoname");
730
1178
} else {
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
1179
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1180
"\n", ip, interface, (uintmax_t)port);
733
1181
}
734
1182
} else {
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
1183
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1184
ip, (uintmax_t)port);
737
1185
}
738
1186
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
739
1187
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;
1188
if(af == AF_INET6){
1189
ret = getnameinfo((struct sockaddr *)&to,
1190
sizeof(struct sockaddr_in6),
1191
addrstr, sizeof(addrstr), NULL, 0,
1192
NI_NUMERICHOST);
1193
} else {
1194
ret = getnameinfo((struct sockaddr *)&to,
1195
sizeof(struct sockaddr_in),
1196
addrstr, sizeof(addrstr), NULL, 0,
1197
NI_NUMERICHOST);
1198
}
1199
if(ret == EAI_SYSTEM){
1200
perror_plus("getnameinfo");
1201
} else if(ret != 0) {
1202
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1203
} else if(strcmp(addrstr, ip) != 0){
1204
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1205
}
1206
}
1207
1208
if(quit_now){
1209
errno = EINTR;
1210
goto mandos_end;
1211
}
1212
1213
while(true){
1214
if(af == AF_INET6){
1215
ret = connect(tcp_sd, (struct sockaddr *)&to,
1216
sizeof(struct sockaddr_in6));
1217
} else {
1218
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1219
sizeof(struct sockaddr_in));
1220
}
1221
if(ret < 0){
1222
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1223
and if_index != AVAHI_IF_UNSPEC
1224
and connect_to == NULL
1225
and not route_added and
1226
((af == AF_INET6 and not
1227
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1228
&to)->sin6_addr)))
1229
or (af == AF_INET and
1230
/* Not a a IPv4LL address */
1231
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1232
& 0xFFFF0000L) != 0xA9FE0000L))){
1233
/* Work around Avahi bug - Avahi does not announce link-local
1234
addresses if it has a global address, so local hosts with
1235
*only* a link-local address (e.g. Mandos clients) cannot
1236
connect to a Mandos server announced by Avahi on a server
1237
host with a global address. Work around this by retrying
1238
with an explicit route added with the server's address.
1239
1240
Avahi bug reference:
1241
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1242
https://bugs.debian.org/587961
1243
*/
1244
if(debug){
1245
fprintf_plus(stderr, "Mandos server unreachable, trying"
1246
" direct route\n");
1247
}
1248
int e = errno;
1249
route_added = add_local_route(ip, if_index);
1250
if(route_added){
1251
continue;
1252
}
1253
errno = e;
1254
}
1255
if(errno != ECONNREFUSED or debug){
1256
int e = errno;
1257
perror_plus("connect");
1258
errno = e;
1259
}
1260
goto mandos_end;
1261
}
1262
1263
if(quit_now){
1264
errno = EINTR;
1265
goto mandos_end;
1266
}
1267
break;
779
1268
}
780
1269
781
1270
const char *out = mandos_protocol_version;
817
1306
goto mandos_end;
818
1307
}
819
1308
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1309
/* This casting via intptr_t is to eliminate warning about casting
1310
an int to a pointer type. This is exactly how the GnuTLS Guile
1311
function "set-session-transport-fd!" does it. */
1312
gnutls_transport_set_ptr(session,
1313
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
822
1314
823
1315
if(quit_now){
824
1316
errno = EINTR;
929
1421
if(buffer_length > 0){
930
1422
ssize_t decrypted_buffer_size;
931
1423
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
932
&decrypted_buffer);
1424
&decrypted_buffer, mc);
933
1425
if(decrypted_buffer_size >= 0){
934
1426
1427
clearerr(stdout);
935
1428
written = 0;
936
1429
while(written < (size_t) decrypted_buffer_size){
937
1430
if(quit_now){
953
1446
}
954
1447
written += (size_t)ret;
955
1448
}
1449
ret = fflush(stdout);
1450
if(ret != 0){
1451
int e = errno;
1452
if(debug){
1453
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1454
strerror(errno));
1455
}
1456
errno = e;
1457
goto mandos_end;
1458
}
956
1459
retval = 0;
957
1460
}
958
1461
}
961
1464
962
1465
mandos_end:
963
1466
{
1467
if(route_added){
1468
if(not delete_local_route(ip, if_index)){
1469
fprintf_plus(stderr, "Failed to delete local route to %s on"
1470
" interface %d", ip, if_index);
1471
}
1472
}
964
1473
int e = errno;
965
1474
free(decrypted_buffer);
966
1475
free(buffer);
967
1476
if(tcp_sd >= 0){
968
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1477
ret = close(tcp_sd);
969
1478
}
970
1479
if(ret == -1){
971
1480
if(e == 0){
983
1492
return retval;
984
1493
}
985
1494
1495
__attribute__((nonnull))
986
1496
static void resolve_callback(AvahiSServiceResolver *r,
987
1497
AvahiIfIndex interface,
988
1498
AvahiProtocol proto,
996
1506
AVAHI_GCC_UNUSED AvahiStringList *txt,
997
1507
AVAHI_GCC_UNUSED AvahiLookupResultFlags
998
1508
flags,
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1509
void *mc){
1510
if(r == NULL){
1511
return;
1512
}
1001
1513
1002
1514
/* Called whenever a service has been resolved successfully or
1003
1515
timed out */
1004
1516
1005
1517
if(quit_now){
1518
avahi_s_service_resolver_free(r);
1006
1519
return;
1007
1520
}
1008
1521
1012
1525
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1013
1526
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1014
1527
domain,
1015
avahi_strerror(avahi_server_errno(mc.server)));
1528
avahi_strerror(avahi_server_errno
1529
(((mandos_context*)mc)->server)));
1016
1530
break;
1017
1531
1018
1532
case AVAHI_RESOLVER_FOUND:
1024
1538
PRIdMAX ") on port %" PRIu16 "\n", name,
1025
1539
host_name, ip, (intmax_t)interface, port);
1026
1540
}
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1541
int ret = start_mandos_communication(ip, (in_port_t)port,
1542
interface,
1543
avahi_proto_to_af(proto),
1544
mc);
1029
1545
if(ret == 0){
1030
avahi_simple_poll_quit(mc.simple_poll);
1546
avahi_simple_poll_quit(simple_poll);
1031
1547
} else {
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1548
if(not add_server(ip, (in_port_t)port, interface,
1549
avahi_proto_to_af(proto),
1550
&((mandos_context*)mc)->current_server)){
1551
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1552
" list\n", name);
1553
}
1034
1554
}
1035
1555
}
1036
1556
}
1046
1566
const char *domain,
1047
1567
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1048
1568
flags,
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1569
void *mc){
1570
if(b == NULL){
1571
return;
1572
}
1051
1573
1052
1574
/* Called whenever a new services becomes available on the LAN or
1053
1575
is removed from the LAN */
1061
1583
case AVAHI_BROWSER_FAILURE:
1062
1584
1063
1585
fprintf_plus(stderr, "(Avahi browser) %s\n",
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
1586
avahi_strerror(avahi_server_errno
1587
(((mandos_context*)mc)->server)));
1588
avahi_simple_poll_quit(simple_poll);
1066
1589
return;
1067
1590
1068
1591
case AVAHI_BROWSER_NEW:
1071
1594
the callback function is called the Avahi server will free the
1072
1595
resolver for us. */
1073
1596
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1597
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1598
interface, protocol, name, type,
1599
domain, protocol, 0,
1600
resolve_callback, mc) == NULL)
1077
1601
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1078
1602
" %s\n", name,
1079
avahi_strerror(avahi_server_errno(mc.server)));
1603
avahi_strerror(avahi_server_errno
1604
(((mandos_context*)mc)->server)));
1080
1605
break;
1081
1606
1082
1607
case AVAHI_BROWSER_REMOVE:
1101
1626
signal_received = sig;
1102
1627
int old_errno = errno;
1103
1628
/* set main loop to exit */
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1629
if(simple_poll != NULL){
1630
avahi_simple_poll_quit(simple_poll);
1106
1631
}
1107
1632
errno = old_errno;
1108
1633
}
1109
1634
1635
__attribute__((nonnull, warn_unused_result))
1110
1636
bool get_flags(const char *ifname, struct ifreq *ifr){
1111
1637
int ret;
1638
int old_errno;
1112
1639
1113
1640
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1114
1641
if(s < 0){
1642
old_errno = errno;
1115
1643
perror_plus("socket");
1644
errno = old_errno;
1116
1645
return false;
1117
1646
}
1118
strcpy(ifr->ifr_name, ifname);
1647
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1648
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1119
1649
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1120
1650
if(ret == -1){
1121
1651
if(debug){
1652
old_errno = errno;
1122
1653
perror_plus("ioctl SIOCGIFFLAGS");
1654
errno = old_errno;
1123
1655
}
1124
1656
return false;
1125
1657
}
1126
1658
return true;
1127
1659
}
1128
1660
1661
__attribute__((nonnull, warn_unused_result))
1129
1662
bool good_flags(const char *ifname, const struct ifreq *ifr){
1130
1663
1131
1664
/* Reject the loopback device */
1173
1706
* corresponds to an acceptable network device.
1174
1707
* (This function is passed to scandir(3) as a filter function.)
1175
1708
*/
1709
__attribute__((nonnull, warn_unused_result))
1176
1710
int good_interface(const struct dirent *if_entry){
1177
1711
if(if_entry->d_name[0] == '.'){
1178
1712
return 0;
1194
1728
}
1195
1729
1196
1730
/*
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
1731
* This function determines if a network interface is up.
1732
*/
1733
__attribute__((nonnull, warn_unused_result))
1734
bool interface_is_up(const char *interface){
1735
struct ifreq ifr;
1736
if(not get_flags(interface, &ifr)){
1737
if(debug){
1738
fprintf_plus(stderr, "Failed to get flags for interface "
1739
"\"%s\"\n", interface);
1740
}
1741
return false;
1742
}
1743
1744
return (bool)(ifr.ifr_flags & IFF_UP);
1745
}
1746
1747
/*
1748
* This function determines if a network interface is running
1749
*/
1750
__attribute__((nonnull, warn_unused_result))
1751
bool interface_is_running(const char *interface){
1752
struct ifreq ifr;
1753
if(not get_flags(interface, &ifr)){
1754
if(debug){
1755
fprintf_plus(stderr, "Failed to get flags for interface "
1756
"\"%s\"\n", interface);
1757
}
1758
return false;
1759
}
1760
1761
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1762
}
1763
1764
__attribute__((nonnull, pure, warn_unused_result))
1239
1765
int notdotentries(const struct dirent *direntry){
1240
1766
/* Skip "." and ".." */
1241
1767
if(direntry->d_name[0] == '.'
1248
1774
}
1249
1775
1250
1776
/* Is this directory entry a runnable program? */
1777
__attribute__((nonnull, warn_unused_result))
1251
1778
int runnable_hook(const struct dirent *direntry){
1252
1779
int ret;
1253
1780
size_t sret;
1261
1788
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1262
1789
"abcdefghijklmnopqrstuvwxyz"
1263
1790
"0123456789"
1264
"_-");
1791
"_.-");
1265
1792
if((direntry->d_name)[sret] != '\0'){
1266
1793
/* Contains non-allowed characters */
1267
1794
if(debug){
1271
1798
return 0;
1272
1799
}
1273
1800
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);
1801
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1282
1802
if(ret == -1){
1283
1803
if(debug){
1284
1804
perror_plus("Could not stat hook");
1301
1821
}
1302
1822
return 0;
1303
1823
}
1824
if(debug){
1825
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1826
direntry->d_name);
1827
}
1304
1828
return 1;
1305
1829
}
1306
1830
1307
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1831
__attribute__((nonnull, warn_unused_result))
1832
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1833
mandos_context *mc){
1308
1834
int ret;
1309
1835
struct timespec now;
1310
1836
struct timespec waited_time;
1311
1837
intmax_t block_time;
1312
1838
1313
1839
while(true){
1314
if(mc.current_server == NULL){
1315
if (debug){
1840
if(mc->current_server == NULL){
1841
if(debug){
1316
1842
fprintf_plus(stderr, "Wait until first server is found."
1317
1843
" No timeout!\n");
1318
1844
}
1319
1845
ret = avahi_simple_poll_iterate(s, -1);
1320
1846
} else {
1321
if (debug){
1847
if(debug){
1322
1848
fprintf_plus(stderr, "Check current_server if we should run"
1323
1849
" it, or wait\n");
1324
1850
}
1331
1857
/* Calculating in ms how long time between now and server
1332
1858
who we visted longest time ago. Now - last seen. */
1333
1859
waited_time.tv_sec = (now.tv_sec
1334
- mc.current_server->last_seen.tv_sec);
1860
- mc->current_server->last_seen.tv_sec);
1335
1861
waited_time.tv_nsec = (now.tv_nsec
1336
- mc.current_server->last_seen.tv_nsec);
1862
- mc->current_server->last_seen.tv_nsec);
1337
1863
/* total time is 10s/10,000ms.
1338
1864
Converting to s from ms by dividing by 1,000,
1339
1865
and ns to ms by dividing by 1,000,000. */
1341
1867
- ((intmax_t)waited_time.tv_sec * 1000))
1342
1868
- ((intmax_t)waited_time.tv_nsec / 1000000));
1343
1869
1344
if (debug){
1870
if(debug){
1345
1871
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1346
1872
block_time);
1347
1873
}
1348
1874
1349
1875
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);
1876
ret = start_mandos_communication(mc->current_server->ip,
1877
mc->current_server->port,
1878
mc->current_server->if_index,
1879
mc->current_server->af, mc);
1354
1880
if(ret == 0){
1355
avahi_simple_poll_quit(mc.simple_poll);
1881
avahi_simple_poll_quit(s);
1356
1882
return 0;
1357
1883
}
1358
1884
ret = clock_gettime(CLOCK_MONOTONIC,
1359
&mc.current_server->last_seen);
1885
&mc->current_server->last_seen);
1360
1886
if(ret == -1){
1361
1887
perror_plus("clock_gettime");
1362
1888
return -1;
1363
1889
}
1364
mc.current_server = mc.current_server->next;
1890
mc->current_server = mc->current_server->next;
1365
1891
block_time = 0; /* Call avahi to find new Mandos
1366
1892
servers, but don't block */
1367
1893
}
1369
1895
ret = avahi_simple_poll_iterate(s, (int)block_time);
1370
1896
}
1371
1897
if(ret != 0){
1372
if (ret > 0 or errno != EINTR){
1898
if(ret > 0 or errno != EINTR){
1373
1899
return (ret != 1) ? ret : 0;
1374
1900
}
1375
1901
}
1376
1902
}
1377
1903
}
1378
1904
1379
bool run_network_hooks(const char *mode, const char *interface,
1905
__attribute__((nonnull))
1906
void run_network_hooks(const char *mode, const char *interface,
1380
1907
const float delay){
1381
struct dirent **direntries;
1382
struct dirent *direntry;
1383
int ret;
1384
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1385
alphasort);
1908
struct dirent **direntries = NULL;
1909
if(hookdir_fd == -1){
1910
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1911
| O_CLOEXEC);
1912
if(hookdir_fd == -1){
1913
if(errno == ENOENT){
1914
if(debug){
1915
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1916
" found\n", hookdir);
1917
}
1918
} else {
1919
perror_plus("open");
1920
}
1921
return;
1922
}
1923
}
1924
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1925
runnable_hook, alphasort);
1386
1926
if(numhooks == -1){
1387
1927
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){
1928
return;
1929
}
1930
struct dirent *direntry;
1931
int ret;
1932
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1933
if(devnull == -1){
1934
perror_plus("open(\"/dev/null\", O_RDONLY)");
1935
return;
1936
}
1937
for(int i = 0; i < numhooks; i++){
1938
direntry = direntries[i];
1939
if(debug){
1940
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1941
direntry->d_name);
1942
}
1943
pid_t hook_pid = fork();
1944
if(hook_pid == 0){
1945
/* Child */
1946
/* Raise privileges */
1947
errno = raise_privileges_permanently();
1948
if(errno != 0){
1949
perror_plus("Failed to raise privileges");
1950
_exit(EX_NOPERM);
1951
}
1952
/* Set group */
1953
errno = 0;
1954
ret = setgid(0);
1955
if(ret == -1){
1956
perror_plus("setgid");
1957
_exit(EX_NOPERM);
1958
}
1959
/* Reset supplementary groups */
1960
errno = 0;
1961
ret = setgroups(0, NULL);
1962
if(ret == -1){
1963
perror_plus("setgroups");
1964
_exit(EX_NOPERM);
1965
}
1966
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1967
if(ret == -1){
1968
perror_plus("setenv");
1969
_exit(EX_OSERR);
1970
}
1971
ret = setenv("DEVICE", interface, 1);
1972
if(ret == -1){
1973
perror_plus("setenv");
1974
_exit(EX_OSERR);
1975
}
1976
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1977
if(ret == -1){
1978
perror_plus("setenv");
1979
_exit(EX_OSERR);
1980
}
1981
ret = setenv("MODE", mode, 1);
1982
if(ret == -1){
1983
perror_plus("setenv");
1984
_exit(EX_OSERR);
1985
}
1986
char *delaystring;
1987
ret = asprintf(&delaystring, "%f", (double)delay);
1988
if(ret == -1){
1395
1989
perror_plus("asprintf");
1396
continue;
1990
_exit(EX_OSERR);
1397
1991
}
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
}
1992
ret = setenv("DELAY", delaystring, 1);
1993
if(ret == -1){
1436
1994
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;
1995
perror_plus("setenv");
1996
_exit(EX_OSERR);
1997
}
1998
free(delaystring);
1999
if(connect_to != NULL){
2000
ret = setenv("CONNECT", connect_to, 1);
2001
if(ret == -1){
2002
perror_plus("setenv");
2003
_exit(EX_OSERR);
2004
}
2005
}
2006
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2007
direntry->d_name,
2008
O_RDONLY));
2009
if(hook_fd == -1){
2010
perror_plus("openat");
2011
_exit(EXIT_FAILURE);
2012
}
2013
if(close(hookdir_fd) == -1){
2014
perror_plus("close");
2015
_exit(EXIT_FAILURE);
2016
}
2017
ret = dup2(devnull, STDIN_FILENO);
2018
if(ret == -1){
2019
perror_plus("dup2(devnull, STDIN_FILENO)");
2020
_exit(EX_OSERR);
2021
}
2022
ret = close(devnull);
2023
if(ret == -1){
2024
perror_plus("close");
2025
_exit(EX_OSERR);
2026
}
2027
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2028
if(ret == -1){
2029
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2030
_exit(EX_OSERR);
2031
}
2032
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2033
environ) == -1){
2034
perror_plus("fexecve");
2035
_exit(EXIT_FAILURE);
2036
}
2037
} else {
2038
if(hook_pid == -1){
2039
perror_plus("fork");
2040
free(direntry);
2041
continue;
2042
}
2043
int status;
2044
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2045
perror_plus("waitpid");
2046
free(direntry);
2047
continue;
2048
}
2049
if(WIFEXITED(status)){
2050
if(WEXITSTATUS(status) != 0){
2051
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2052
" with status %d\n", direntry->d_name,
2053
WEXITSTATUS(status));
2054
free(direntry);
2055
continue;
2056
}
2057
} else if(WIFSIGNALED(status)){
2058
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2059
" signal %d\n", direntry->d_name,
2060
WTERMSIG(status));
2061
free(direntry);
2062
continue;
2063
} else {
2064
fprintf_plus(stderr, "Warning: network hook \"%s\""
2065
" crashed\n", direntry->d_name);
2066
free(direntry);
2067
continue;
2068
}
2069
}
2070
if(debug){
2071
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2072
direntry->d_name);
2073
}
2074
free(direntry);
2075
}
2076
free(direntries);
2077
if(close(hookdir_fd) == -1){
2078
perror_plus("close");
2079
} else {
2080
hookdir_fd = -1;
2081
}
2082
close(devnull);
2083
}
2084
2085
__attribute__((nonnull, warn_unused_result))
2086
int bring_up_interface(const char *const interface,
2087
const float delay){
2088
int old_errno = errno;
2089
int ret;
2090
struct ifreq network;
2091
unsigned int if_index = if_nametoindex(interface);
2092
if(if_index == 0){
2093
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2094
errno = old_errno;
2095
return ENXIO;
2096
}
2097
2098
if(quit_now){
2099
errno = old_errno;
2100
return EINTR;
2101
}
2102
2103
if(not interface_is_up(interface)){
2104
int ret_errno = 0;
2105
int ioctl_errno = 0;
2106
if(not get_flags(interface, &network)){
2107
ret_errno = errno;
2108
fprintf_plus(stderr, "Failed to get flags for interface "
2109
"\"%s\"\n", interface);
2110
errno = old_errno;
2111
return ret_errno;
2112
}
2113
network.ifr_flags |= IFF_UP; /* set flag */
2114
2115
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2116
if(sd == -1){
2117
ret_errno = errno;
2118
perror_plus("socket");
2119
errno = old_errno;
2120
return ret_errno;
2121
}
2122
2123
if(quit_now){
2124
ret = close(sd);
2125
if(ret == -1){
2126
perror_plus("close");
2127
}
2128
errno = old_errno;
2129
return EINTR;
2130
}
2131
2132
if(debug){
2133
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2134
interface);
2135
}
2136
2137
/* Raise privileges */
2138
ret_errno = raise_privileges();
2139
if(ret_errno != 0){
2140
errno = ret_errno;
2141
perror_plus("Failed to raise privileges");
2142
}
2143
2144
#ifdef __linux__
2145
int ret_linux;
2146
bool restore_loglevel = false;
2147
if(ret_errno == 0){
2148
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2149
messages about the network interface to mess up the prompt */
2150
ret_linux = klogctl(8, NULL, 5);
2151
if(ret_linux == -1){
2152
perror_plus("klogctl");
2153
} else {
2154
restore_loglevel = true;
2155
}
2156
}
2157
#endif /* __linux__ */
2158
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2159
ioctl_errno = errno;
2160
#ifdef __linux__
2161
if(restore_loglevel){
2162
ret_linux = klogctl(7, NULL, 0);
2163
if(ret_linux == -1){
2164
perror_plus("klogctl");
2165
}
2166
}
2167
#endif /* __linux__ */
2168
2169
/* If raise_privileges() succeeded above */
2170
if(ret_errno == 0){
2171
/* Lower privileges */
2172
ret_errno = lower_privileges();
2173
if(ret_errno != 0){
2174
errno = ret_errno;
2175
perror_plus("Failed to lower privileges");
2176
}
2177
}
2178
2179
/* Close the socket */
2180
ret = close(sd);
2181
if(ret == -1){
2182
perror_plus("close");
2183
}
2184
2185
if(ret_setflags == -1){
2186
errno = ioctl_errno;
2187
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2188
errno = old_errno;
2189
return ioctl_errno;
2190
}
2191
} else if(debug){
2192
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2193
interface);
2194
}
2195
2196
/* Sleep checking until interface is running.
2197
Check every 0.25s, up to total time of delay */
2198
for(int i=0; i < delay * 4; i++){
2199
if(interface_is_running(interface)){
2200
break;
2201
}
2202
struct timespec sleeptime = { .tv_nsec = 250000000 };
2203
ret = nanosleep(&sleeptime, NULL);
2204
if(ret == -1 and errno != EINTR){
2205
perror_plus("nanosleep");
2206
}
2207
}
2208
2209
errno = old_errno;
2210
return 0;
2211
}
2212
2213
__attribute__((nonnull, warn_unused_result))
2214
int take_down_interface(const char *const interface){
2215
int old_errno = errno;
2216
struct ifreq network;
2217
unsigned int if_index = if_nametoindex(interface);
2218
if(if_index == 0){
2219
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2220
errno = old_errno;
2221
return ENXIO;
2222
}
2223
if(interface_is_up(interface)){
2224
int ret_errno = 0;
2225
int ioctl_errno = 0;
2226
if(not get_flags(interface, &network) and debug){
2227
ret_errno = errno;
2228
fprintf_plus(stderr, "Failed to get flags for interface "
2229
"\"%s\"\n", interface);
2230
errno = old_errno;
2231
return ret_errno;
2232
}
2233
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2234
2235
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2236
if(sd == -1){
2237
ret_errno = errno;
2238
perror_plus("socket");
2239
errno = old_errno;
2240
return ret_errno;
2241
}
2242
2243
if(debug){
2244
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2245
interface);
2246
}
2247
2248
/* Raise privileges */
2249
ret_errno = raise_privileges();
2250
if(ret_errno != 0){
2251
errno = ret_errno;
2252
perror_plus("Failed to raise privileges");
2253
}
2254
2255
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2256
ioctl_errno = errno;
2257
2258
/* If raise_privileges() succeeded above */
2259
if(ret_errno == 0){
2260
/* Lower privileges */
2261
ret_errno = lower_privileges();
2262
if(ret_errno != 0){
2263
errno = ret_errno;
2264
perror_plus("Failed to lower privileges");
2265
}
2266
}
2267
2268
/* Close the socket */
2269
int ret = close(sd);
2270
if(ret == -1){
2271
perror_plus("close");
2272
}
2273
2274
if(ret_setflags == -1){
2275
errno = ioctl_errno;
2276
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2277
errno = old_errno;
2278
return ioctl_errno;
2279
}
2280
} else if(debug){
2281
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2282
interface);
2283
}
2284
2285
errno = old_errno;
2286
return 0;
1475
2287
}
1476
2288
1477
2289
int main(int argc, char *argv[]){
2290
mandos_context mc = { .server = NULL, .dh_bits = 0,
2291
.priority = "SECURE256:!CTYPE-X.509"
2292
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2293
.current_server = NULL, .interfaces = NULL,
2294
.interfaces_size = 0 };
1478
2295
AvahiSServiceBrowser *sb = NULL;
1479
int error;
2296
error_t ret_errno;
1480
2297
int ret;
1481
2298
intmax_t tmpmax;
1482
2299
char *tmp;
1483
2300
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;
2301
char *interfaces_to_take_down = NULL;
2302
size_t interfaces_to_take_down_size = 0;
2303
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2304
char old_tempdir[] = "/tmp/mandosXXXXXX";
2305
char *tempdir = NULL;
1492
2306
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1493
2307
const char *seckey = PATHDIR "/" SECKEY;
1494
2308
const char *pubkey = PATHDIR "/" PUBKEY;
2309
const char *dh_params_file = NULL;
2310
char *interfaces_hooks = NULL;
1495
2311
1496
2312
bool gnutls_initialized = false;
1497
2313
bool gpgme_initialized = false;
1549
2365
.doc = "Bit length of the prime number used in the"
1550
2366
" Diffie-Hellman key exchange",
1551
2367
.group = 2 },
2368
{ .name = "dh-params", .key = 134,
2369
.arg = "FILE",
2370
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2371
" for the Diffie-Hellman key exchange",
2372
.group = 2 },
1552
2373
{ .name = "priority", .key = 130,
1553
2374
.arg = "STRING",
1554
2375
.doc = "GnuTLS priority string for the TLS handshake",
1559
2380
.group = 2 },
1560
2381
{ .name = "retry", .key = 132,
1561
2382
.arg = "SECONDS",
1562
.doc = "Retry interval used when denied by the mandos server",
2383
.doc = "Retry interval used when denied by the Mandos server",
1563
2384
.group = 2 },
1564
2385
{ .name = "network-hook-dir", .key = 133,
1565
2386
.arg = "DIR",
1588
2409
connect_to = arg;
1589
2410
break;
1590
2411
case 'i': /* --interface */
1591
interface = arg;
2412
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2413
arg, (int)',');
2414
if(ret_errno != 0){
2415
argp_error(state, "%s", strerror(ret_errno));
2416
}
1592
2417
break;
1593
2418
case 's': /* --seckey */
1594
2419
seckey = arg;
1605
2430
}
1606
2431
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1607
2432
break;
2433
case 134: /* --dh-params */
2434
dh_params_file = arg;
2435
break;
1608
2436
case 130: /* --priority */
1609
2437
mc.priority = arg;
1610
2438
break;
1637
2465
argp_state_help(state, state->out_stream,
1638
2466
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1639
2467
case 'V': /* --version */
1640
fprintf_plus(state->out_stream,
1641
"Mandos plugin mandos-client: ");
1642
2468
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1643
2469
exit(argp_err_exit_status);
1644
2470
break;
1652
2478
.args_doc = "",
1653
2479
.doc = "Mandos client -- Get and decrypt"
1654
2480
" passwords from a Mandos server" };
1655
ret = argp_parse(&argp, argc, argv,
1656
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1657
switch(ret){
2481
ret_errno = argp_parse(&argp, argc, argv,
2482
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2483
switch(ret_errno){
1658
2484
case 0:
1659
2485
break;
1660
2486
case ENOMEM:
1661
2487
default:
1662
errno = ret;
2488
errno = ret_errno;
1663
2489
perror_plus("argp_parse");
1664
2490
exitcode = EX_OSERR;
1665
2491
goto end;
1668
2494
goto end;
1669
2495
}
1670
2496
}
1671
2497
1672
2498
{
1673
2499
/* 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");
2500
<https://bugs.debian.org/633582> */
2501
2502
/* Re-raise privileges */
2503
ret = raise_privileges();
2504
if(ret != 0){
2505
errno = ret;
2506
perror_plus("Failed to raise privileges");
2507
} else {
2508
struct stat st;
2509
2510
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2511
int seckey_fd = open(seckey, O_RDONLY);
2512
if(seckey_fd == -1){
2513
perror_plus("open");
2514
} else {
2515
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2516
if(ret == -1){
2517
perror_plus("fstat");
2518
} else {
2519
if(S_ISREG(st.st_mode)
2520
and st.st_uid == 0 and st.st_gid == 0){
2521
ret = fchown(seckey_fd, uid, gid);
2522
if(ret == -1){
2523
perror_plus("fchown");
2524
}
2525
}
2526
}
2527
close(seckey_fd);
2528
}
2529
}
2530
2531
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2532
int pubkey_fd = open(pubkey, O_RDONLY);
2533
if(pubkey_fd == -1){
2534
perror_plus("open");
2535
} else {
2536
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2537
if(ret == -1){
2538
perror_plus("fstat");
2539
} else {
2540
if(S_ISREG(st.st_mode)
2541
and st.st_uid == 0 and st.st_gid == 0){
2542
ret = fchown(pubkey_fd, uid, gid);
2543
if(ret == -1){
2544
perror_plus("fchown");
2545
}
2546
}
2547
}
2548
close(pubkey_fd);
2549
}
2550
}
2551
2552
if(dh_params_file != NULL
2553
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2554
int dhparams_fd = open(dh_params_file, O_RDONLY);
2555
if(dhparams_fd == -1){
2556
perror_plus("open");
2557
} else {
2558
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2559
if(ret == -1){
2560
perror_plus("fstat");
2561
} else {
2562
if(S_ISREG(st.st_mode)
2563
and st.st_uid == 0 and st.st_gid == 0){
2564
ret = fchown(dhparams_fd, uid, gid);
2565
if(ret == -1){
2566
perror_plus("fchown");
2567
}
2568
}
2569
}
2570
close(dhparams_fd);
2571
}
2572
}
2573
2574
/* Lower privileges */
2575
ret = lower_privileges();
2576
if(ret != 0){
2577
errno = ret;
2578
perror_plus("Failed to lower privileges");
2579
}
2580
}
2581
}
2582
2583
/* Remove invalid interface names (except "none") */
2584
{
2585
char *interface = NULL;
2586
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2587
interface))){
2588
if(strcmp(interface, "none") != 0
2589
and if_nametoindex(interface) == 0){
2590
if(interface[0] != '\0'){
2591
fprintf_plus(stderr, "Not using nonexisting interface"
2592
" \"%s\"\n", interface);
2593
}
2594
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2595
interface = NULL;
2596
}
1731
2597
}
1732
2598
}
1733
2599
1734
2600
/* Run network hooks */
1735
2601
{
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
}
2602
if(mc.interfaces != NULL){
2603
interfaces_hooks = malloc(mc.interfaces_size);
2604
if(interfaces_hooks == NULL){
2605
perror_plus("malloc");
2606
goto end;
2607
}
2608
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2609
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2610
}
2611
run_network_hooks("start", interfaces_hooks != NULL ?
2612
interfaces_hooks : "", delay);
1751
2613
}
1752
2614
1753
2615
if(not debug){
1754
2616
avahi_set_log_function(empty_log);
1755
2617
}
1756
2618
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
2619
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1790
2620
from the signal handler */
1791
2621
/* Initialize the pseudo-RNG for Avahi */
1792
2622
srand((unsigned int) time(NULL));
1793
mc.simple_poll = avahi_simple_poll_new();
1794
if(mc.simple_poll == NULL){
2623
simple_poll = avahi_simple_poll_new();
2624
if(simple_poll == NULL){
1795
2625
fprintf_plus(stderr,
1796
2626
"Avahi: Failed to create simple poll object.\n");
1797
2627
exitcode = EX_UNAVAILABLE;
1861
2691
}
1862
2692
}
1863
2693
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");
2694
/* If no interfaces were specified, make a list */
2695
if(mc.interfaces == NULL){
2696
struct dirent **direntries = NULL;
2697
/* Look for any good interfaces */
2698
ret = scandir(sys_class_net, &direntries, good_interface,
2699
alphasort);
2700
if(ret >= 1){
2701
/* Add all found interfaces to interfaces list */
2702
for(int i = 0; i < ret; ++i){
2703
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2704
direntries[i]->d_name);
2705
if(ret_errno != 0){
2706
errno = ret_errno;
2707
perror_plus("argz_add");
2708
free(direntries[i]);
2709
continue;
2710
}
2711
if(debug){
2712
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2713
direntries[i]->d_name);
2714
}
2715
free(direntries[i]);
2716
}
2717
free(direntries);
2718
} else {
2719
if(ret == 0){
2720
free(direntries);
2721
}
2722
fprintf_plus(stderr, "Could not find a network interface\n");
2723
exitcode = EXIT_FAILURE;
2724
goto end;
2725
}
2726
}
2727
2728
/* Bring up interfaces which are down, and remove any "none"s */
2729
{
2730
char *interface = NULL;
2731
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2732
interface))){
2733
/* If interface name is "none", stop bringing up interfaces.
2734
Also remove all instances of "none" from the list */
2735
if(strcmp(interface, "none") == 0){
2736
argz_delete(&mc.interfaces, &mc.interfaces_size,
2737
interface);
2738
interface = NULL;
2739
while((interface = argz_next(mc.interfaces,
2740
mc.interfaces_size, interface))){
2741
if(strcmp(interface, "none") == 0){
2742
argz_delete(&mc.interfaces, &mc.interfaces_size,
2743
interface);
2744
interface = NULL;
1949
2745
}
1950
2746
}
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
2747
break;
1969
2748
}
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
}
2749
bool interface_was_up = interface_is_up(interface);
2750
errno = bring_up_interface(interface, delay);
2751
if(not interface_was_up){
2752
if(errno != 0){
2753
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2754
" %s\n", interface, strerror(errno));
2755
} else {
2756
errno = argz_add(&interfaces_to_take_down,
2757
&interfaces_to_take_down_size,
2758
interface);
2759
if(errno != 0){
2760
perror_plus("argz_add");
2761
}
2762
}
2763
}
2764
}
2765
if(debug and (interfaces_to_take_down == NULL)){
2766
fprintf_plus(stderr, "No interfaces were brought up\n");
2767
}
2768
}
2769
2770
/* If we only got one interface, explicitly use only that one */
2771
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2772
if(debug){
2773
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2774
mc.interfaces);
2775
}
2776
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1999
2777
}
2000
2778
2001
2779
if(quit_now){
2002
2780
goto end;
2003
2781
}
2004
2782
2005
ret = init_gnutls_global(pubkey, seckey);
2783
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2006
2784
if(ret == -1){
2007
2785
fprintf_plus(stderr, "init_gnutls_global failed\n");
2008
2786
exitcode = EX_UNAVAILABLE;
2015
2793
goto end;
2016
2794
}
2017
2795
2018
if(mkdtemp(tempdir) == NULL){
2796
/* Try /run/tmp before /tmp */
2797
tempdir = mkdtemp(run_tempdir);
2798
if(tempdir == NULL and errno == ENOENT){
2799
if(debug){
2800
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2801
run_tempdir, old_tempdir);
2802
}
2803
tempdir = mkdtemp(old_tempdir);
2804
}
2805
if(tempdir == NULL){
2019
2806
perror_plus("mkdtemp");
2020
2807
goto end;
2021
2808
}
2022
tempdir_created = true;
2023
2809
2024
2810
if(quit_now){
2025
2811
goto end;
2026
2812
}
2027
2813
2028
if(not init_gpgme(pubkey, seckey, tempdir)){
2814
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2029
2815
fprintf_plus(stderr, "init_gpgme failed\n");
2030
2816
exitcode = EX_UNAVAILABLE;
2031
2817
goto end;
2041
2827
/* Connect directly, do not use Zeroconf */
2042
2828
/* (Mainly meant for debugging) */
2043
2829
char *address = strrchr(connect_to, ':');
2830
2044
2831
if(address == NULL){
2045
2832
fprintf_plus(stderr, "No colon in address\n");
2046
2833
exitcode = EX_USAGE;
2051
2838
goto end;
2052
2839
}
2053
2840
2054
uint16_t port;
2841
in_port_t port;
2055
2842
errno = 0;
2056
2843
tmpmax = strtoimax(address+1, &tmp, 10);
2057
2844
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2058
or tmpmax != (uint16_t)tmpmax){
2845
or tmpmax != (in_port_t)tmpmax){
2059
2846
fprintf_plus(stderr, "Bad port number\n");
2060
2847
exitcode = EX_USAGE;
2061
2848
goto end;
2062
2849
}
2063
2850
2064
2851
if(quit_now){
2065
2852
goto end;
2066
2853
}
2067
2854
2068
port = (uint16_t)tmpmax;
2855
port = (in_port_t)tmpmax;
2069
2856
*address = '\0';
2070
2857
/* Colon in address indicates IPv6 */
2071
2858
int af;
2087
2874
}
2088
2875
2089
2876
while(not quit_now){
2090
ret = start_mandos_communication(address, port, if_index, af);
2877
ret = start_mandos_communication(address, port, if_index, af,
2878
&mc);
2091
2879
if(quit_now or ret == 0){
2092
2880
break;
2093
2881
}
2095
2883
fprintf_plus(stderr, "Retrying in %d seconds\n",
2096
2884
(int)retry_interval);
2097
2885
}
2098
sleep((int)retry_interval);
2886
sleep((unsigned int)retry_interval);
2099
2887
}
2100
2888
2101
if (not quit_now){
2889
if(not quit_now){
2102
2890
exitcode = EXIT_SUCCESS;
2103
2891
}
2104
2892
2119
2907
config.publish_domain = 0;
2120
2908
2121
2909
/* Allocate a new server */
2122
mc.server = avahi_server_new(avahi_simple_poll_get
2123
(mc.simple_poll), &config, NULL,
2124
NULL, &error);
2910
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2911
&config, NULL, NULL, &ret);
2125
2912
2126
2913
/* Free the Avahi configuration data */
2127
2914
avahi_server_config_free(&config);
2130
2917
/* Check if creating the Avahi server object succeeded */
2131
2918
if(mc.server == NULL){
2132
2919
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2133
avahi_strerror(error));
2920
avahi_strerror(ret));
2134
2921
exitcode = EX_UNAVAILABLE;
2135
2922
goto end;
2136
2923
}
2142
2929
/* Create the Avahi service browser */
2143
2930
sb = avahi_s_service_browser_new(mc.server, if_index,
2144
2931
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2145
NULL, 0, browse_callback, NULL);
2932
NULL, 0, browse_callback,
2933
(void *)&mc);
2146
2934
if(sb == NULL){
2147
2935
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2148
2936
avahi_strerror(avahi_server_errno(mc.server)));
2159
2947
if(debug){
2160
2948
fprintf_plus(stderr, "Starting Avahi loop search\n");
2161
2949
}
2162
2163
ret = avahi_loop_with_timeout(mc.simple_poll,
2164
(int)(retry_interval * 1000));
2950
2951
ret = avahi_loop_with_timeout(simple_poll,
2952
(int)(retry_interval * 1000), &mc);
2165
2953
if(debug){
2166
2954
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2167
2955
(ret == 0) ? "successfully" : "with error");
2170
2958
end:
2171
2959
2172
2960
if(debug){
2173
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2961
if(signal_received){
2962
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2963
argv[0], signal_received,
2964
strsignal(signal_received));
2965
} else {
2966
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2967
}
2174
2968
}
2175
2969
2176
2970
/* Cleanup things */
2971
free(mc.interfaces);
2972
2177
2973
if(sb != NULL)
2178
2974
avahi_s_service_browser_free(sb);
2179
2975
2180
2976
if(mc.server != NULL)
2181
2977
avahi_server_free(mc.server);
2182
2978
2183
if(mc.simple_poll != NULL)
2184
avahi_simple_poll_free(mc.simple_poll);
2979
if(simple_poll != NULL)
2980
avahi_simple_poll_free(simple_poll);
2185
2981
2186
2982
if(gnutls_initialized){
2187
2983
gnutls_certificate_free_credentials(mc.cred);
2188
gnutls_global_deinit();
2189
2984
gnutls_dh_params_deinit(mc.dh_params);
2190
2985
}
2191
2986
2192
2987
if(gpgme_initialized){
2193
2988
gpgme_release(mc.ctx);
2194
2989
}
2195
2990
2196
2991
/* Cleans up the circular linked list of Mandos servers the client
2197
2992
has seen */
2198
2993
if(mc.current_server != NULL){
2199
2994
mc.current_server->prev->next = NULL;
2200
2995
while(mc.current_server != NULL){
2201
2996
server *next = mc.current_server->next;
2997
#ifdef __GNUC__
2998
#pragma GCC diagnostic push
2999
#pragma GCC diagnostic ignored "-Wcast-qual"
3000
#endif
3001
free((char *)(mc.current_server->ip));
3002
#ifdef __GNUC__
3003
#pragma GCC diagnostic pop
3004
#endif
2202
3005
free(mc.current_server);
2203
3006
mc.current_server = next;
2204
3007
}
2205
3008
}
2206
3009
2207
/* Re-raise priviliges */
3010
/* Re-raise privileges */
2208
3011
{
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;
3012
ret = raise_privileges();
3013
if(ret != 0){
3014
errno = ret;
3015
perror_plus("Failed to raise privileges");
3016
} else {
3017
3018
/* Run network hooks */
3019
run_network_hooks("stop", interfaces_hooks != NULL ?
3020
interfaces_hooks : "", delay);
3021
3022
/* Take down the network interfaces which were brought up */
3023
{
3024
char *interface = NULL;
3025
while((interface=argz_next(interfaces_to_take_down,
3026
interfaces_to_take_down_size,
3027
interface))){
3028
ret = take_down_interface(interface);
3029
if(ret != 0){
3030
errno = ret;
3031
perror_plus("Failed to take down interface");
3032
}
3033
}
3034
if(debug and (interfaces_to_take_down == NULL)){
3035
fprintf_plus(stderr, "No interfaces needed to be taken"
3036
" down\n");
3037
}
3038
}
2217
3039
}
2218
3040
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
}
3041
ret = lower_privileges_permanently();
3042
if(ret != 0){
3043
errno = ret;
3044
perror_plus("Failed to lower privileges permanently");
2235
3045
}
2236
3046
}
2237
/* Lower privileges permanently */
2238
errno = 0;
2239
ret = setuid(uid);
2240
if(ret == -1){
2241
perror_plus("setuid");
3047
3048
free(interfaces_to_take_down);
3049
free(interfaces_hooks);
3050
3051
void clean_dir_at(int base, const char * const dirname,
3052
uintmax_t level){
3053
struct dirent **direntries = NULL;
3054
int dret;
3055
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3056
O_RDONLY
3057
| O_NOFOLLOW
3058
| O_DIRECTORY
3059
| O_PATH));
3060
if(dir_fd == -1){
3061
perror_plus("open");
3062
}
3063
int numentries = scandirat(dir_fd, ".", &direntries,
3064
notdotentries, alphasort);
3065
if(numentries >= 0){
3066
for(int i = 0; i < numentries; i++){
3067
if(debug){
3068
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3069
dirname, direntries[i]->d_name);
3070
}
3071
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3072
if(dret == -1){
3073
if(errno == EISDIR){
3074
dret = unlinkat(dir_fd, direntries[i]->d_name,
3075
AT_REMOVEDIR);
3076
}
3077
if((dret == -1) and (errno == ENOTEMPTY)
3078
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3079
== 0) and (level == 0)){
3080
/* Recurse only in this special case */
3081
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3082
dret = 0;
3083
}
3084
if(dret == -1){
3085
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3086
direntries[i]->d_name, strerror(errno));
3087
}
3088
}
3089
free(direntries[i]);
3090
}
3091
3092
/* need to clean even if 0 because man page doesn't specify */
3093
free(direntries);
3094
if(numentries == -1){
3095
perror_plus("scandirat");
3096
}
3097
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3098
if(dret == -1 and errno != ENOENT){
3099
perror_plus("rmdir");
3100
}
3101
} else {
3102
perror_plus("scandirat");
3103
}
3104
close(dir_fd);
2242
3105
}
2243
3106
2244
3107
/* 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
}
3108
if(tempdir != NULL){
3109
clean_dir_at(-1, tempdir, 0);
2278
3110
}
2279
3111
2280
3112
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0