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- Committer: Teddy Hogeborn
- Date: 2012-06-16 19:30:08 UTC
- Revision ID: teddy@recompile.se-20120616193008-2erbfaw5a5y3yay1
* debian/mandos-client.README.Debian: Update documentation for using
multiple interfaces.
multiple interfaces.
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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 /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
43
stdout, ferror(), remove() */
44
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> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
65
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
66
EAI_SYSTEM, ENETUNREACH,
67
EHOSTUNREACH, ECONNREFUSED, EPROTO,
68
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
69
ENOTEMPTY,
64
#include <errno.h> /* perror(), errno,
70
65
program_invocation_short_name */
71
66
#include <time.h> /* nanosleep(), time(), sleep() */
72
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
77
72
*/
78
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
79
74
getuid(), getgid(), seteuid(),
80
setgid(), pause(), _exit(),
81
unlinkat() */
82
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
83
77
#include <iso646.h> /* not, or, and */
84
78
#include <argp.h> /* struct argp_option, error_t, struct
85
79
argp_state, struct argp,
97
91
argz_delete(), argz_append(),
98
92
argz_stringify(), argz_add(),
99
93
argz_count() */
100
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
101
EAI_SYSTEM, gai_strerror() */
102
94
103
95
#ifdef __linux__
104
96
#include <sys/klog.h> /* klogctl() */
146
138
static const char sys_class_net[] = "/sys/class/net";
147
139
char *connect_to = NULL;
148
140
const char *hookdir = HOOKDIR;
149
int hookdir_fd = -1;
150
141
uid_t uid = 65534;
151
142
gid_t gid = 65534;
152
143
163
154
164
155
/* Used for passing in values through the Avahi callback functions */
165
156
typedef struct {
157
AvahiSimplePoll *simple_poll;
166
158
AvahiServer *server;
167
159
gnutls_certificate_credentials_t cred;
168
160
unsigned int dh_bits;
170
162
const char *priority;
171
163
gpgme_ctx_t ctx;
172
164
server *current_server;
173
char *interfaces;
174
size_t interfaces_size;
175
165
} mandos_context;
176
166
177
/* global so signal handler can reach it*/
178
AvahiSimplePoll *simple_poll;
167
/* global context so signal handler can reach it*/
168
mandos_context mc = { .simple_poll = NULL, .server = NULL,
169
.dh_bits = 1024, .priority = "SECURE256"
170
":!CTYPE-X.509:+CTYPE-OPENPGP",
171
.current_server = NULL };
179
172
180
173
sig_atomic_t quit_now = 0;
181
174
int signal_received = 0;
189
182
perror(print_text);
190
183
}
191
184
192
__attribute__((format (gnu_printf, 2, 3), nonnull))
185
__attribute__((format (gnu_printf, 2, 3)))
193
186
int fprintf_plus(FILE *stream, const char *format, ...){
194
187
va_list ap;
195
188
va_start (ap, format);
196
189
197
190
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
198
191
program_invocation_short_name));
199
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
192
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
200
193
}
201
194
202
195
/*
204
197
* bytes. "buffer_capacity" is how much is currently allocated,
205
198
* "buffer_length" is how much is already used.
206
199
*/
207
__attribute__((nonnull, warn_unused_result))
208
200
size_t incbuffer(char **buffer, size_t buffer_length,
209
201
size_t buffer_capacity){
210
202
if(buffer_length + BUFFER_SIZE > buffer_capacity){
211
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
212
if(new_buf == NULL){
213
int old_errno = errno;
214
free(*buffer);
215
errno = old_errno;
216
*buffer = NULL;
203
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
204
if(buffer == NULL){
217
205
return 0;
218
206
}
219
*buffer = new_buf;
220
207
buffer_capacity += BUFFER_SIZE;
221
208
}
222
209
return buffer_capacity;
223
210
}
224
211
225
212
/* Add server to set of servers to retry periodically */
226
__attribute__((nonnull, warn_unused_result))
227
213
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
228
int af, server **current_server){
214
int af){
229
215
int ret;
230
216
server *new_server = malloc(sizeof(server));
231
217
if(new_server == NULL){
238
224
.af = af };
239
225
if(new_server->ip == NULL){
240
226
perror_plus("strdup");
241
free(new_server);
242
return false;
243
}
244
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
245
if(ret == -1){
246
perror_plus("clock_gettime");
247
#ifdef __GNUC__
248
#pragma GCC diagnostic push
249
#pragma GCC diagnostic ignored "-Wcast-qual"
250
#endif
251
free((char *)(new_server->ip));
252
#ifdef __GNUC__
253
#pragma GCC diagnostic pop
254
#endif
255
free(new_server);
256
227
return false;
257
228
}
258
229
/* Special case of first server */
259
if(*current_server == NULL){
230
if (mc.current_server == NULL){
260
231
new_server->next = new_server;
261
232
new_server->prev = new_server;
262
*current_server = new_server;
233
mc.current_server = new_server;
234
/* Place the new server last in the list */
263
235
} else {
264
/* Place the new server last in the list */
265
new_server->next = *current_server;
266
new_server->prev = (*current_server)->prev;
236
new_server->next = mc.current_server;
237
new_server->prev = mc.current_server->prev;
267
238
new_server->prev->next = new_server;
268
(*current_server)->prev = new_server;
239
mc.current_server->prev = new_server;
240
}
241
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
242
if(ret == -1){
243
perror_plus("clock_gettime");
244
return false;
269
245
}
270
246
return true;
271
247
}
273
249
/*
274
250
* Initialize GPGME.
275
251
*/
276
__attribute__((nonnull, warn_unused_result))
277
static bool init_gpgme(const char * const seckey,
278
const char * const pubkey,
279
const char * const tempdir,
280
mandos_context *mc){
252
static bool init_gpgme(const char *seckey, const char *pubkey,
253
const char *tempdir){
281
254
gpgme_error_t rc;
282
255
gpgme_engine_info_t engine_info;
283
256
257
284
258
/*
285
259
* Helper function to insert pub and seckey to the engine keyring.
286
260
*/
287
bool import_key(const char * const filename){
261
bool import_key(const char *filename){
288
262
int ret;
289
263
int fd;
290
264
gpgme_data_t pgp_data;
302
276
return false;
303
277
}
304
278
305
rc = gpgme_op_import(mc->ctx, pgp_data);
279
rc = gpgme_op_import(mc.ctx, pgp_data);
306
280
if(rc != GPG_ERR_NO_ERROR){
307
281
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
308
282
gpgme_strsource(rc), gpgme_strerror(rc));
309
283
return false;
310
284
}
311
285
312
ret = close(fd);
286
ret = (int)TEMP_FAILURE_RETRY(close(fd));
313
287
if(ret == -1){
314
288
perror_plus("close");
315
289
}
352
326
}
353
327
354
328
/* Create new GPGME "context" */
355
rc = gpgme_new(&(mc->ctx));
329
rc = gpgme_new(&(mc.ctx));
356
330
if(rc != GPG_ERR_NO_ERROR){
357
331
fprintf_plus(stderr, "Mandos plugin mandos-client: "
358
332
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
371
345
* Decrypt OpenPGP data.
372
346
* Returns -1 on error
373
347
*/
374
__attribute__((nonnull, warn_unused_result))
375
348
static ssize_t pgp_packet_decrypt(const char *cryptotext,
376
349
size_t crypto_size,
377
char **plaintext,
378
mandos_context *mc){
350
char **plaintext){
379
351
gpgme_data_t dh_crypto, dh_plain;
380
352
gpgme_error_t rc;
381
353
ssize_t ret;
407
379
408
380
/* Decrypt data from the cryptotext data buffer to the plaintext
409
381
data buffer */
410
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
382
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
411
383
if(rc != GPG_ERR_NO_ERROR){
412
384
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
413
385
gpgme_strsource(rc), gpgme_strerror(rc));
414
386
plaintext_length = -1;
415
387
if(debug){
416
388
gpgme_decrypt_result_t result;
417
result = gpgme_op_decrypt_result(mc->ctx);
389
result = gpgme_op_decrypt_result(mc.ctx);
418
390
if(result == NULL){
419
391
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
420
392
} else {
497
469
return plaintext_length;
498
470
}
499
471
500
__attribute__((warn_unused_result, const))
501
static const char *safe_string(const char *str){
502
if(str == NULL)
503
return "(unknown)";
504
return str;
505
}
506
507
__attribute__((warn_unused_result))
508
static const char *safer_gnutls_strerror(int value){
472
static const char * safer_gnutls_strerror(int value){
509
473
const char *ret = gnutls_strerror(value);
510
return safe_string(ret);
474
if(ret == NULL)
475
ret = "(unknown)";
476
return ret;
511
477
}
512
478
513
479
/* GnuTLS log function callback */
514
__attribute__((nonnull))
515
480
static void debuggnutls(__attribute__((unused)) int level,
516
481
const char* string){
517
482
fprintf_plus(stderr, "GnuTLS: %s", string);
518
483
}
519
484
520
__attribute__((nonnull(1, 2, 4), warn_unused_result))
521
485
static int init_gnutls_global(const char *pubkeyfilename,
522
const char *seckeyfilename,
523
const char *dhparamsfilename,
524
mandos_context *mc){
486
const char *seckeyfilename){
525
487
int ret;
526
unsigned int uret;
527
488
528
489
if(debug){
529
490
fprintf_plus(stderr, "Initializing GnuTLS\n");
530
491
}
531
492
493
ret = gnutls_global_init();
494
if(ret != GNUTLS_E_SUCCESS){
495
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
496
safer_gnutls_strerror(ret));
497
return -1;
498
}
499
532
500
if(debug){
533
501
/* "Use a log level over 10 to enable all debugging options."
534
502
* - GnuTLS manual
538
506
}
539
507
540
508
/* OpenPGP credentials */
541
ret = gnutls_certificate_allocate_credentials(&mc->cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
542
510
if(ret != GNUTLS_E_SUCCESS){
543
511
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
544
512
safer_gnutls_strerror(ret));
513
gnutls_global_deinit();
545
514
return -1;
546
515
}
547
516
553
522
}
554
523
555
524
ret = gnutls_certificate_set_openpgp_key_file
556
(mc->cred, pubkeyfilename, seckeyfilename,
525
(mc.cred, pubkeyfilename, seckeyfilename,
557
526
GNUTLS_OPENPGP_FMT_BASE64);
558
527
if(ret != GNUTLS_E_SUCCESS){
559
528
fprintf_plus(stderr,
565
534
}
566
535
567
536
/* GnuTLS server initialization */
568
ret = gnutls_dh_params_init(&mc->dh_params);
537
ret = gnutls_dh_params_init(&mc.dh_params);
569
538
if(ret != GNUTLS_E_SUCCESS){
570
539
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
571
540
" initialization: %s\n",
572
541
safer_gnutls_strerror(ret));
573
542
goto globalfail;
574
543
}
575
/* If a Diffie-Hellman parameters file was given, try to use it */
576
if(dhparamsfilename != NULL){
577
gnutls_datum_t params = { .data = NULL, .size = 0 };
578
do {
579
int dhpfile = open(dhparamsfilename, O_RDONLY);
580
if(dhpfile == -1){
581
perror_plus("open");
582
dhparamsfilename = NULL;
583
break;
584
}
585
size_t params_capacity = 0;
586
while(true){
587
params_capacity = incbuffer((char **)¶ms.data,
588
(size_t)params.size,
589
(size_t)params_capacity);
590
if(params_capacity == 0){
591
perror_plus("incbuffer");
592
free(params.data);
593
params.data = NULL;
594
dhparamsfilename = NULL;
595
break;
596
}
597
ssize_t bytes_read = read(dhpfile,
598
params.data + params.size,
599
BUFFER_SIZE);
600
/* EOF */
601
if(bytes_read == 0){
602
break;
603
}
604
/* check bytes_read for failure */
605
if(bytes_read < 0){
606
perror_plus("read");
607
free(params.data);
608
params.data = NULL;
609
dhparamsfilename = NULL;
610
break;
611
}
612
params.size += (unsigned int)bytes_read;
613
}
614
if(params.data == NULL){
615
dhparamsfilename = NULL;
616
}
617
if(dhparamsfilename == NULL){
618
break;
619
}
620
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
621
GNUTLS_X509_FMT_PEM);
622
if(ret != GNUTLS_E_SUCCESS){
623
fprintf_plus(stderr, "Failed to parse DH parameters in file"
624
" \"%s\": %s\n", dhparamsfilename,
625
safer_gnutls_strerror(ret));
626
dhparamsfilename = NULL;
627
}
628
} while(false);
629
}
630
if(dhparamsfilename == NULL){
631
if(mc->dh_bits == 0){
632
/* Find out the optimal number of DH bits */
633
/* Try to read the private key file */
634
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
635
do {
636
int secfile = open(seckeyfilename, O_RDONLY);
637
if(secfile == -1){
638
perror_plus("open");
639
break;
640
}
641
size_t buffer_capacity = 0;
642
while(true){
643
buffer_capacity = incbuffer((char **)&buffer.data,
644
(size_t)buffer.size,
645
(size_t)buffer_capacity);
646
if(buffer_capacity == 0){
647
perror_plus("incbuffer");
648
free(buffer.data);
649
buffer.data = NULL;
650
break;
651
}
652
ssize_t bytes_read = read(secfile,
653
buffer.data + buffer.size,
654
BUFFER_SIZE);
655
/* EOF */
656
if(bytes_read == 0){
657
break;
658
}
659
/* check bytes_read for failure */
660
if(bytes_read < 0){
661
perror_plus("read");
662
free(buffer.data);
663
buffer.data = NULL;
664
break;
665
}
666
buffer.size += (unsigned int)bytes_read;
667
}
668
close(secfile);
669
} while(false);
670
/* If successful, use buffer to parse private key */
671
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
672
if(buffer.data != NULL){
673
{
674
gnutls_openpgp_privkey_t privkey = NULL;
675
ret = gnutls_openpgp_privkey_init(&privkey);
676
if(ret != GNUTLS_E_SUCCESS){
677
fprintf_plus(stderr, "Error initializing OpenPGP key"
678
" structure: %s",
679
safer_gnutls_strerror(ret));
680
free(buffer.data);
681
buffer.data = NULL;
682
} else {
683
ret = gnutls_openpgp_privkey_import
684
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
687
safer_gnutls_strerror(ret));
688
privkey = NULL;
689
}
690
free(buffer.data);
691
buffer.data = NULL;
692
if(privkey != NULL){
693
/* Use private key to suggest an appropriate
694
sec_param */
695
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
696
gnutls_openpgp_privkey_deinit(privkey);
697
if(debug){
698
fprintf_plus(stderr, "This OpenPGP key implies using"
699
" a GnuTLS security parameter \"%s\".\n",
700
safe_string(gnutls_sec_param_get_name
701
(sec_param)));
702
}
703
}
704
}
705
}
706
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
707
/* Err on the side of caution */
708
sec_param = GNUTLS_SEC_PARAM_ULTRA;
709
if(debug){
710
fprintf_plus(stderr, "Falling back to security parameter"
711
" \"%s\"\n",
712
safe_string(gnutls_sec_param_get_name
713
(sec_param)));
714
}
715
}
716
}
717
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
718
if(uret != 0){
719
mc->dh_bits = uret;
720
if(debug){
721
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
722
" implies %u DH bits; using that.\n",
723
safe_string(gnutls_sec_param_get_name
724
(sec_param)),
725
mc->dh_bits);
726
}
727
} else {
728
fprintf_plus(stderr, "Failed to get implied number of DH"
729
" bits for security parameter \"%s\"): %s\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
safer_gnutls_strerror(ret));
733
goto globalfail;
734
}
735
} else if(debug){
736
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
737
mc->dh_bits);
738
}
739
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
740
if(ret != GNUTLS_E_SUCCESS){
741
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
742
" bits): %s\n", mc->dh_bits,
743
safer_gnutls_strerror(ret));
744
goto globalfail;
745
}
746
}
747
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
545
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
547
safer_gnutls_strerror(ret));
548
goto globalfail;
549
}
550
551
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
748
552
749
553
return 0;
750
554
751
555
globalfail:
752
556
753
gnutls_certificate_free_credentials(mc->cred);
754
gnutls_dh_params_deinit(mc->dh_params);
557
gnutls_certificate_free_credentials(mc.cred);
558
gnutls_global_deinit();
559
gnutls_dh_params_deinit(mc.dh_params);
755
560
return -1;
756
561
}
757
562
758
__attribute__((nonnull, warn_unused_result))
759
static int init_gnutls_session(gnutls_session_t *session,
760
mandos_context *mc){
563
static int init_gnutls_session(gnutls_session_t *session){
761
564
int ret;
762
565
/* GnuTLS session creation */
763
566
do {
775
578
{
776
579
const char *err;
777
580
do {
778
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
581
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
779
582
if(quit_now){
780
583
gnutls_deinit(*session);
781
584
return -1;
792
595
793
596
do {
794
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
795
mc->cred);
598
mc.cred);
796
599
if(quit_now){
797
600
gnutls_deinit(*session);
798
601
return -1;
808
611
/* ignore client certificate if any. */
809
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
810
613
614
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
615
811
616
return 0;
812
617
}
813
618
815
620
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
816
621
__attribute__((unused)) const char *txt){}
817
622
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
int raise_privileges(void){
821
int old_errno = errno;
822
int ret = 0;
823
if(seteuid(0) == -1){
824
ret = errno;
825
}
826
errno = old_errno;
827
return ret;
828
}
829
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
int raise_privileges_permanently(void){
833
int old_errno = errno;
834
int ret = raise_privileges();
835
if(ret != 0){
836
errno = old_errno;
837
return ret;
838
}
839
if(setuid(0) == -1){
840
ret = errno;
841
}
842
errno = old_errno;
843
return ret;
844
}
845
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
int lower_privileges(void){
849
int old_errno = errno;
850
int ret = 0;
851
if(seteuid(uid) == -1){
852
ret = errno;
853
}
854
errno = old_errno;
855
return ret;
856
}
857
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
int lower_privileges_permanently(void){
861
int old_errno = errno;
862
int ret = 0;
863
if(setuid(uid) == -1){
864
ret = errno;
865
}
866
errno = old_errno;
867
return ret;
868
}
869
870
/* Helper function to add_local_route() and delete_local_route() */
871
__attribute__((nonnull, warn_unused_result))
872
static bool add_delete_local_route(const bool add,
873
const char *address,
874
AvahiIfIndex if_index){
875
int ret;
876
char helper[] = "mandos-client-iprouteadddel";
877
char add_arg[] = "add";
878
char delete_arg[] = "delete";
879
char debug_flag[] = "--debug";
880
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
881
if(pluginhelperdir == NULL){
882
if(debug){
883
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
884
" variable not set; cannot run helper\n");
885
}
886
return false;
887
}
888
889
char interface[IF_NAMESIZE];
890
if(if_indextoname((unsigned int)if_index, interface) == NULL){
891
perror_plus("if_indextoname");
892
return false;
893
}
894
895
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
896
if(devnull == -1){
897
perror_plus("open(\"/dev/null\", O_RDONLY)");
898
return false;
899
}
900
pid_t pid = fork();
901
if(pid == 0){
902
/* Child */
903
/* Raise privileges */
904
errno = raise_privileges_permanently();
905
if(errno != 0){
906
perror_plus("Failed to raise privileges");
907
/* _exit(EX_NOPERM); */
908
} else {
909
/* Set group */
910
errno = 0;
911
ret = setgid(0);
912
if(ret == -1){
913
perror_plus("setgid");
914
_exit(EX_NOPERM);
915
}
916
/* Reset supplementary groups */
917
errno = 0;
918
ret = setgroups(0, NULL);
919
if(ret == -1){
920
perror_plus("setgroups");
921
_exit(EX_NOPERM);
922
}
923
}
924
ret = dup2(devnull, STDIN_FILENO);
925
if(ret == -1){
926
perror_plus("dup2(devnull, STDIN_FILENO)");
927
_exit(EX_OSERR);
928
}
929
ret = close(devnull);
930
if(ret == -1){
931
perror_plus("close");
932
_exit(EX_OSERR);
933
}
934
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
935
if(ret == -1){
936
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
937
_exit(EX_OSERR);
938
}
939
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
940
O_RDONLY
941
| O_DIRECTORY
942
| O_PATH
943
| O_CLOEXEC));
944
if(helperdir_fd == -1){
945
perror_plus("open");
946
_exit(EX_UNAVAILABLE);
947
}
948
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
949
helper, O_RDONLY));
950
if(helper_fd == -1){
951
perror_plus("openat");
952
close(helperdir_fd);
953
_exit(EX_UNAVAILABLE);
954
}
955
close(helperdir_fd);
956
#ifdef __GNUC__
957
#pragma GCC diagnostic push
958
#pragma GCC diagnostic ignored "-Wcast-qual"
959
#endif
960
if(fexecve(helper_fd, (char *const [])
961
{ helper, add ? add_arg : delete_arg, (char *)address,
962
interface, debug ? debug_flag : NULL, NULL },
963
environ) == -1){
964
#ifdef __GNUC__
965
#pragma GCC diagnostic pop
966
#endif
967
perror_plus("fexecve");
968
_exit(EXIT_FAILURE);
969
}
970
}
971
if(pid == -1){
972
perror_plus("fork");
973
return false;
974
}
975
int status;
976
pid_t pret = -1;
977
errno = 0;
978
do {
979
pret = waitpid(pid, &status, 0);
980
if(pret == -1 and errno == EINTR and quit_now){
981
int errno_raising = 0;
982
if((errno = raise_privileges()) != 0){
983
errno_raising = errno;
984
perror_plus("Failed to raise privileges in order to"
985
" kill helper program");
986
}
987
if(kill(pid, SIGTERM) == -1){
988
perror_plus("kill");
989
}
990
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
991
perror_plus("Failed to lower privileges after killing"
992
" helper program");
993
}
994
return false;
995
}
996
} while(pret == -1 and errno == EINTR);
997
if(pret == -1){
998
perror_plus("waitpid");
999
return false;
1000
}
1001
if(WIFEXITED(status)){
1002
if(WEXITSTATUS(status) != 0){
1003
fprintf_plus(stderr, "Error: iprouteadddel exited"
1004
" with status %d\n", WEXITSTATUS(status));
1005
return false;
1006
}
1007
return true;
1008
}
1009
if(WIFSIGNALED(status)){
1010
fprintf_plus(stderr, "Error: iprouteadddel died by"
1011
" signal %d\n", WTERMSIG(status));
1012
return false;
1013
}
1014
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1015
return false;
1016
}
1017
1018
__attribute__((nonnull, warn_unused_result))
1019
static bool add_local_route(const char *address,
1020
AvahiIfIndex if_index){
1021
if(debug){
1022
fprintf_plus(stderr, "Adding route to %s\n", address);
1023
}
1024
return add_delete_local_route(true, address, if_index);
1025
}
1026
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool delete_local_route(const char *address,
1029
AvahiIfIndex if_index){
1030
if(debug){
1031
fprintf_plus(stderr, "Removing route to %s\n", address);
1032
}
1033
return add_delete_local_route(false, address, if_index);
1034
}
1035
1036
623
/* Called when a Mandos server is found */
1037
__attribute__((nonnull, warn_unused_result))
1038
624
static int start_mandos_communication(const char *ip, in_port_t port,
1039
625
AvahiIfIndex if_index,
1040
int af, mandos_context *mc){
626
int af){
1041
627
int ret, tcp_sd = -1;
1042
628
ssize_t sret;
1043
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
1044
633
char *buffer = NULL;
1045
634
char *decrypted_buffer = NULL;
1046
635
size_t buffer_length = 0;
1049
638
int retval = -1;
1050
639
gnutls_session_t session;
1051
640
int pf; /* Protocol family */
1052
bool route_added = false;
1053
641
1054
642
errno = 0;
1055
643
1071
659
return -1;
1072
660
}
1073
661
1074
/* If the interface is specified and we have a list of interfaces */
1075
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1076
/* Check if the interface is one of the interfaces we are using */
1077
bool match = false;
1078
{
1079
char *interface = NULL;
1080
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1081
interface))){
1082
if(if_nametoindex(interface) == (unsigned int)if_index){
1083
match = true;
1084
break;
1085
}
1086
}
1087
}
1088
if(not match){
1089
/* This interface does not match any in the list, so we don't
1090
connect to the server */
1091
if(debug){
1092
char interface[IF_NAMESIZE];
1093
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1094
perror_plus("if_indextoname");
1095
} else {
1096
fprintf_plus(stderr, "Skipping server on non-used interface"
1097
" \"%s\"\n",
1098
if_indextoname((unsigned int)if_index,
1099
interface));
1100
}
1101
}
1102
return -1;
1103
}
1104
}
1105
1106
ret = init_gnutls_session(&session, mc);
662
ret = init_gnutls_session(&session);
1107
663
if(ret != 0){
1108
664
return -1;
1109
665
}
1113
669
PRIuMAX "\n", ip, (uintmax_t)port);
1114
670
}
1115
671
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
672
tcp_sd = socket(pf, SOCK_STREAM, 0);
1117
673
if(tcp_sd < 0){
1118
674
int e = errno;
1119
675
perror_plus("socket");
1126
682
goto mandos_end;
1127
683
}
1128
684
685
memset(&to, 0, sizeof(to));
1129
686
if(af == AF_INET6){
1130
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1131
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1132
ret = inet_pton(af, ip, &to6->sin6_addr);
687
to.in6.sin6_family = (sa_family_t)af;
688
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1133
689
} else { /* IPv4 */
1134
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1135
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to4->sin_addr);
690
to.in.sin_family = (sa_family_t)af;
691
ret = inet_pton(af, ip, &to.in.sin_addr);
1137
692
}
1138
693
if(ret < 0 ){
1139
694
int e = errno;
1148
703
goto mandos_end;
1149
704
}
1150
705
if(af == AF_INET6){
1151
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1152
if(IN6_IS_ADDR_LINKLOCAL
1153
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
706
to.in6.sin6_port = htons(port);
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
709
-Wunreachable-code*/
1154
710
if(if_index == AVAHI_IF_UNSPEC){
1155
711
fprintf_plus(stderr, "An IPv6 link-local address is"
1156
712
" incomplete without a network interface\n");
1158
714
goto mandos_end;
1159
715
}
1160
716
/* Set the network interface number as scope */
1161
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
717
to.in6.sin6_scope_id = (uint32_t)if_index;
1162
718
}
1163
719
} else {
1164
((struct sockaddr_in *)&to)->sin_port = htons(port);
720
to.in.sin_port = htons(port); /* Spurious warnings from
721
-Wconversion and
722
-Wunreachable-code */
1165
723
}
1166
724
1167
725
if(quit_now){
1184
742
}
1185
743
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1186
744
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1187
if(af == AF_INET6){
1188
ret = getnameinfo((struct sockaddr *)&to,
1189
sizeof(struct sockaddr_in6),
1190
addrstr, sizeof(addrstr), NULL, 0,
1191
NI_NUMERICHOST);
1192
} else {
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
}
1198
if(ret == EAI_SYSTEM){
1199
perror_plus("getnameinfo");
1200
} else if(ret != 0) {
1201
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1202
} else if(strcmp(addrstr, ip) != 0){
1203
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1204
}
1205
}
1206
1207
if(quit_now){
1208
errno = EINTR;
1209
goto mandos_end;
1210
}
1211
1212
while(true){
1213
if(af == AF_INET6){
1214
ret = connect(tcp_sd, (struct sockaddr *)&to,
1215
sizeof(struct sockaddr_in6));
1216
} else {
1217
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1218
sizeof(struct sockaddr_in));
1219
}
1220
if(ret < 0){
1221
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1222
and if_index != AVAHI_IF_UNSPEC
1223
and connect_to == NULL
1224
and not route_added and
1225
((af == AF_INET6 and not
1226
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1227
&to)->sin6_addr)))
1228
or (af == AF_INET and
1229
/* Not a a IPv4LL address */
1230
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1231
& 0xFFFF0000L) != 0xA9FE0000L))){
1232
/* Work around Avahi bug - Avahi does not announce link-local
1233
addresses if it has a global address, so local hosts with
1234
*only* a link-local address (e.g. Mandos clients) cannot
1235
connect to a Mandos server announced by Avahi on a server
1236
host with a global address. Work around this by retrying
1237
with an explicit route added with the server's address.
1238
1239
Avahi bug reference:
1240
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1241
https://bugs.debian.org/587961
1242
*/
1243
if(debug){
1244
fprintf_plus(stderr, "Mandos server unreachable, trying"
1245
" direct route\n");
1246
}
1247
int e = errno;
1248
route_added = add_local_route(ip, if_index);
1249
if(route_added){
1250
continue;
1251
}
1252
errno = e;
1253
}
1254
if(errno != ECONNREFUSED or debug){
1255
int e = errno;
1256
perror_plus("connect");
1257
errno = e;
1258
}
1259
goto mandos_end;
1260
}
1261
1262
if(quit_now){
1263
errno = EINTR;
1264
goto mandos_end;
1265
}
1266
break;
745
const char *pcret;
746
if(af == AF_INET6){
747
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
748
sizeof(addrstr));
749
} else {
750
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
751
sizeof(addrstr));
752
}
753
if(pcret == NULL){
754
perror_plus("inet_ntop");
755
} else {
756
if(strcmp(addrstr, ip) != 0){
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
758
}
759
}
760
}
761
762
if(quit_now){
763
errno = EINTR;
764
goto mandos_end;
765
}
766
767
if(af == AF_INET6){
768
ret = connect(tcp_sd, &to.in6, sizeof(to));
769
} else {
770
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
771
}
772
if(ret < 0){
773
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
int e = errno;
775
perror_plus("connect");
776
errno = e;
777
}
778
goto mandos_end;
779
}
780
781
if(quit_now){
782
errno = EINTR;
783
goto mandos_end;
1267
784
}
1268
785
1269
786
const char *out = mandos_protocol_version;
1420
937
if(buffer_length > 0){
1421
938
ssize_t decrypted_buffer_size;
1422
939
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1423
&decrypted_buffer, mc);
940
&decrypted_buffer);
1424
941
if(decrypted_buffer_size >= 0){
1425
942
1426
clearerr(stdout);
1427
943
written = 0;
1428
944
while(written < (size_t) decrypted_buffer_size){
1429
945
if(quit_now){
1445
961
}
1446
962
written += (size_t)ret;
1447
963
}
1448
ret = fflush(stdout);
1449
if(ret != 0){
1450
int e = errno;
1451
if(debug){
1452
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1453
strerror(errno));
1454
}
1455
errno = e;
1456
goto mandos_end;
1457
}
1458
964
retval = 0;
1459
965
}
1460
966
}
1463
969
1464
970
mandos_end:
1465
971
{
1466
if(route_added){
1467
if(not delete_local_route(ip, if_index)){
1468
fprintf_plus(stderr, "Failed to delete local route to %s on"
1469
" interface %d", ip, if_index);
1470
}
1471
}
1472
972
int e = errno;
1473
973
free(decrypted_buffer);
1474
974
free(buffer);
1475
975
if(tcp_sd >= 0){
1476
ret = close(tcp_sd);
976
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1477
977
}
1478
978
if(ret == -1){
1479
979
if(e == 0){
1491
991
return retval;
1492
992
}
1493
993
1494
__attribute__((nonnull))
1495
994
static void resolve_callback(AvahiSServiceResolver *r,
1496
995
AvahiIfIndex interface,
1497
996
AvahiProtocol proto,
1505
1004
AVAHI_GCC_UNUSED AvahiStringList *txt,
1506
1005
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1507
1006
flags,
1508
void *mc){
1007
AVAHI_GCC_UNUSED void* userdata){
1509
1008
if(r == NULL){
1510
1009
return;
1511
1010
}
1514
1013
timed out */
1515
1014
1516
1015
if(quit_now){
1517
avahi_s_service_resolver_free(r);
1518
1016
return;
1519
1017
}
1520
1018
1524
1022
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1525
1023
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1526
1024
domain,
1527
avahi_strerror(avahi_server_errno
1528
(((mandos_context*)mc)->server)));
1025
avahi_strerror(avahi_server_errno(mc.server)));
1529
1026
break;
1530
1027
1531
1028
case AVAHI_RESOLVER_FOUND:
1539
1036
}
1540
1037
int ret = start_mandos_communication(ip, (in_port_t)port,
1541
1038
interface,
1542
avahi_proto_to_af(proto),
1543
mc);
1039
avahi_proto_to_af(proto));
1544
1040
if(ret == 0){
1545
avahi_simple_poll_quit(simple_poll);
1041
avahi_simple_poll_quit(mc.simple_poll);
1546
1042
} else {
1547
1043
if(not add_server(ip, (in_port_t)port, interface,
1548
avahi_proto_to_af(proto),
1549
&((mandos_context*)mc)->current_server)){
1044
avahi_proto_to_af(proto))){
1550
1045
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1551
1046
" list\n", name);
1552
1047
}
1565
1060
const char *domain,
1566
1061
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1567
1062
flags,
1568
void *mc){
1063
AVAHI_GCC_UNUSED void* userdata){
1569
1064
if(b == NULL){
1570
1065
return;
1571
1066
}
1582
1077
case AVAHI_BROWSER_FAILURE:
1583
1078
1584
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1585
avahi_strerror(avahi_server_errno
1586
(((mandos_context*)mc)->server)));
1587
avahi_simple_poll_quit(simple_poll);
1080
avahi_strerror(avahi_server_errno(mc.server)));
1081
avahi_simple_poll_quit(mc.simple_poll);
1588
1082
return;
1589
1083
1590
1084
case AVAHI_BROWSER_NEW:
1593
1087
the callback function is called the Avahi server will free the
1594
1088
resolver for us. */
1595
1089
1596
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1597
interface, protocol, name, type,
1598
domain, protocol, 0,
1599
resolve_callback, mc) == NULL)
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
name, type, domain, protocol, 0,
1092
resolve_callback, NULL) == NULL)
1600
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1601
1094
" %s\n", name,
1602
avahi_strerror(avahi_server_errno
1603
(((mandos_context*)mc)->server)));
1095
avahi_strerror(avahi_server_errno(mc.server)));
1604
1096
break;
1605
1097
1606
1098
case AVAHI_BROWSER_REMOVE:
1625
1117
signal_received = sig;
1626
1118
int old_errno = errno;
1627
1119
/* set main loop to exit */
1628
if(simple_poll != NULL){
1629
avahi_simple_poll_quit(simple_poll);
1120
if(mc.simple_poll != NULL){
1121
avahi_simple_poll_quit(mc.simple_poll);
1630
1122
}
1631
1123
errno = old_errno;
1632
1124
}
1633
1125
1634
__attribute__((nonnull, warn_unused_result))
1635
1126
bool get_flags(const char *ifname, struct ifreq *ifr){
1636
1127
int ret;
1637
int old_errno;
1128
error_t ret_errno;
1638
1129
1639
1130
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1640
1131
if(s < 0){
1641
old_errno = errno;
1132
ret_errno = errno;
1642
1133
perror_plus("socket");
1643
errno = old_errno;
1134
errno = ret_errno;
1644
1135
return false;
1645
1136
}
1646
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1647
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1137
strcpy(ifr->ifr_name, ifname);
1648
1138
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1649
1139
if(ret == -1){
1650
1140
if(debug){
1651
old_errno = errno;
1141
ret_errno = errno;
1652
1142
perror_plus("ioctl SIOCGIFFLAGS");
1653
errno = old_errno;
1143
errno = ret_errno;
1654
1144
}
1655
1145
return false;
1656
1146
}
1657
1147
return true;
1658
1148
}
1659
1149
1660
__attribute__((nonnull, warn_unused_result))
1661
1150
bool good_flags(const char *ifname, const struct ifreq *ifr){
1662
1151
1663
1152
/* Reject the loopback device */
1705
1194
* corresponds to an acceptable network device.
1706
1195
* (This function is passed to scandir(3) as a filter function.)
1707
1196
*/
1708
__attribute__((nonnull, warn_unused_result))
1709
1197
int good_interface(const struct dirent *if_entry){
1710
1198
if(if_entry->d_name[0] == '.'){
1711
1199
return 0;
1729
1217
/*
1730
1218
* This function determines if a network interface is up.
1731
1219
*/
1732
__attribute__((nonnull, warn_unused_result))
1733
1220
bool interface_is_up(const char *interface){
1734
1221
struct ifreq ifr;
1735
1222
if(not get_flags(interface, &ifr)){
1746
1233
/*
1747
1234
* This function determines if a network interface is running
1748
1235
*/
1749
__attribute__((nonnull, warn_unused_result))
1750
1236
bool interface_is_running(const char *interface){
1751
1237
struct ifreq ifr;
1752
1238
if(not get_flags(interface, &ifr)){
1760
1246
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1761
1247
}
1762
1248
1763
__attribute__((nonnull, pure, warn_unused_result))
1764
1249
int notdotentries(const struct dirent *direntry){
1765
1250
/* Skip "." and ".." */
1766
1251
if(direntry->d_name[0] == '.'
1773
1258
}
1774
1259
1775
1260
/* Is this directory entry a runnable program? */
1776
__attribute__((nonnull, warn_unused_result))
1777
1261
int runnable_hook(const struct dirent *direntry){
1778
1262
int ret;
1779
1263
size_t sret;
1787
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1788
1272
"abcdefghijklmnopqrstuvwxyz"
1789
1273
"0123456789"
1790
"_.-");
1274
"_-");
1791
1275
if((direntry->d_name)[sret] != '\0'){
1792
1276
/* Contains non-allowed characters */
1793
1277
if(debug){
1797
1281
return 0;
1798
1282
}
1799
1283
1800
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1801
1292
if(ret == -1){
1802
1293
if(debug){
1803
1294
perror_plus("Could not stat hook");
1827
1318
return 1;
1828
1319
}
1829
1320
1830
__attribute__((nonnull, warn_unused_result))
1831
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1832
mandos_context *mc){
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1833
1322
int ret;
1834
1323
struct timespec now;
1835
1324
struct timespec waited_time;
1836
1325
intmax_t block_time;
1837
1326
1838
1327
while(true){
1839
if(mc->current_server == NULL){
1840
if(debug){
1328
if(mc.current_server == NULL){
1329
if (debug){
1841
1330
fprintf_plus(stderr, "Wait until first server is found."
1842
1331
" No timeout!\n");
1843
1332
}
1844
1333
ret = avahi_simple_poll_iterate(s, -1);
1845
1334
} else {
1846
if(debug){
1335
if (debug){
1847
1336
fprintf_plus(stderr, "Check current_server if we should run"
1848
1337
" it, or wait\n");
1849
1338
}
1856
1345
/* Calculating in ms how long time between now and server
1857
1346
who we visted longest time ago. Now - last seen. */
1858
1347
waited_time.tv_sec = (now.tv_sec
1859
- mc->current_server->last_seen.tv_sec);
1348
- mc.current_server->last_seen.tv_sec);
1860
1349
waited_time.tv_nsec = (now.tv_nsec
1861
- mc->current_server->last_seen.tv_nsec);
1350
- mc.current_server->last_seen.tv_nsec);
1862
1351
/* total time is 10s/10,000ms.
1863
1352
Converting to s from ms by dividing by 1,000,
1864
1353
and ns to ms by dividing by 1,000,000. */
1866
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1867
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1868
1357
1869
if(debug){
1358
if (debug){
1870
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1871
1360
block_time);
1872
1361
}
1873
1362
1874
1363
if(block_time <= 0){
1875
ret = start_mandos_communication(mc->current_server->ip,
1876
mc->current_server->port,
1877
mc->current_server->if_index,
1878
mc->current_server->af, mc);
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1879
1368
if(ret == 0){
1880
avahi_simple_poll_quit(s);
1369
avahi_simple_poll_quit(mc.simple_poll);
1881
1370
return 0;
1882
1371
}
1883
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1884
&mc->current_server->last_seen);
1373
&mc.current_server->last_seen);
1885
1374
if(ret == -1){
1886
1375
perror_plus("clock_gettime");
1887
1376
return -1;
1888
1377
}
1889
mc->current_server = mc->current_server->next;
1378
mc.current_server = mc.current_server->next;
1890
1379
block_time = 0; /* Call avahi to find new Mandos
1891
1380
servers, but don't block */
1892
1381
}
1894
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1895
1384
}
1896
1385
if(ret != 0){
1897
if(ret > 0 or errno != EINTR){
1386
if (ret > 0 or errno != EINTR){
1898
1387
return (ret != 1) ? ret : 0;
1899
1388
}
1900
1389
}
1901
1390
}
1902
1391
}
1903
1392
1904
__attribute__((nonnull))
1905
void run_network_hooks(const char *mode, const char *interface,
1393
/* Set effective uid to 0, return errno */
1394
error_t raise_privileges(void){
1395
error_t old_errno = errno;
1396
error_t ret_errno = 0;
1397
if(seteuid(0) == -1){
1398
ret_errno = errno;
1399
perror_plus("seteuid");
1400
}
1401
errno = old_errno;
1402
return ret_errno;
1403
}
1404
1405
/* Set effective and real user ID to 0. Return errno. */
1406
error_t raise_privileges_permanently(void){
1407
error_t old_errno = errno;
1408
error_t ret_errno = raise_privileges();
1409
if(ret_errno != 0){
1410
errno = old_errno;
1411
return ret_errno;
1412
}
1413
if(setuid(0) == -1){
1414
ret_errno = errno;
1415
perror_plus("seteuid");
1416
}
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
1421
/* Set effective user ID to unprivileged saved user ID */
1422
error_t lower_privileges(void){
1423
error_t old_errno = errno;
1424
error_t ret_errno = 0;
1425
if(seteuid(uid) == -1){
1426
ret_errno = errno;
1427
perror_plus("seteuid");
1428
}
1429
errno = old_errno;
1430
return ret_errno;
1431
}
1432
1433
/* Lower privileges permanently */
1434
error_t lower_privileges_permanently(void){
1435
error_t old_errno = errno;
1436
error_t ret_errno = 0;
1437
if(setuid(uid) == -1){
1438
ret_errno = errno;
1439
perror_plus("setuid");
1440
}
1441
errno = old_errno;
1442
return ret_errno;
1443
}
1444
1445
bool run_network_hooks(const char *mode, const char *interface,
1906
1446
const float delay){
1907
struct dirent **direntries = NULL;
1908
if(hookdir_fd == -1){
1909
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1910
| O_CLOEXEC);
1911
if(hookdir_fd == -1){
1912
if(errno == ENOENT){
1913
if(debug){
1914
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1915
" found\n", hookdir);
1916
}
1917
} else {
1918
perror_plus("open");
1919
}
1920
return;
1921
}
1922
}
1923
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1924
runnable_hook, alphasort);
1447
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1925
1452
if(numhooks == -1){
1926
perror_plus("scandir");
1927
return;
1928
}
1929
struct dirent *direntry;
1930
int ret;
1931
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1932
if(devnull == -1){
1933
perror_plus("open(\"/dev/null\", O_RDONLY)");
1934
return;
1935
}
1936
for(int i = 0; i < numhooks; i++){
1937
direntry = direntries[i];
1938
if(debug){
1939
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1940
direntry->d_name);
1453
if(errno == ENOENT){
1454
if(debug){
1455
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1456
" found\n", hookdir);
1457
}
1458
} else {
1459
perror_plus("scandir");
1941
1460
}
1942
pid_t hook_pid = fork();
1943
if(hook_pid == 0){
1944
/* Child */
1945
/* Raise privileges */
1946
errno = raise_privileges_permanently();
1947
if(errno != 0){
1948
perror_plus("Failed to raise privileges");
1949
_exit(EX_NOPERM);
1950
}
1951
/* Set group */
1952
errno = 0;
1953
ret = setgid(0);
1954
if(ret == -1){
1955
perror_plus("setgid");
1956
_exit(EX_NOPERM);
1957
}
1958
/* Reset supplementary groups */
1959
errno = 0;
1960
ret = setgroups(0, NULL);
1961
if(ret == -1){
1962
perror_plus("setgroups");
1963
_exit(EX_NOPERM);
1964
}
1965
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1966
if(ret == -1){
1967
perror_plus("setenv");
1968
_exit(EX_OSERR);
1969
}
1970
ret = setenv("DEVICE", interface, 1);
1971
if(ret == -1){
1972
perror_plus("setenv");
1973
_exit(EX_OSERR);
1974
}
1975
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1976
if(ret == -1){
1977
perror_plus("setenv");
1978
_exit(EX_OSERR);
1979
}
1980
ret = setenv("MODE", mode, 1);
1981
if(ret == -1){
1982
perror_plus("setenv");
1983
_exit(EX_OSERR);
1984
}
1985
char *delaystring;
1986
ret = asprintf(&delaystring, "%f", (double)delay);
1987
if(ret == -1){
1461
} else {
1462
int devnull = open("/dev/null", O_RDONLY);
1463
for(int i = 0; i < numhooks; i++){
1464
direntry = direntries[i];
1465
char *fullname = NULL;
1466
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1467
if(ret < 0){
1988
1468
perror_plus("asprintf");
1989
_exit(EX_OSERR);
1990
}
1991
ret = setenv("DELAY", delaystring, 1);
1992
if(ret == -1){
1469
continue;
1470
}
1471
if(debug){
1472
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1473
direntry->d_name);
1474
}
1475
pid_t hook_pid = fork();
1476
if(hook_pid == 0){
1477
/* Child */
1478
/* Raise privileges */
1479
raise_privileges_permanently();
1480
/* Set group */
1481
errno = 0;
1482
ret = setgid(0);
1483
if(ret == -1){
1484
perror_plus("setgid");
1485
}
1486
/* Reset supplementary groups */
1487
errno = 0;
1488
ret = setgroups(0, NULL);
1489
if(ret == -1){
1490
perror_plus("setgroups");
1491
}
1492
dup2(devnull, STDIN_FILENO);
1493
close(devnull);
1494
dup2(STDERR_FILENO, STDOUT_FILENO);
1495
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1496
if(ret == -1){
1497
perror_plus("setenv");
1498
_exit(EX_OSERR);
1499
}
1500
ret = setenv("DEVICE", interface, 1);
1501
if(ret == -1){
1502
perror_plus("setenv");
1503
_exit(EX_OSERR);
1504
}
1505
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1506
if(ret == -1){
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
ret = setenv("MODE", mode, 1);
1511
if(ret == -1){
1512
perror_plus("setenv");
1513
_exit(EX_OSERR);
1514
}
1515
char *delaystring;
1516
ret = asprintf(&delaystring, "%f", delay);
1517
if(ret == -1){
1518
perror_plus("asprintf");
1519
_exit(EX_OSERR);
1520
}
1521
ret = setenv("DELAY", delaystring, 1);
1522
if(ret == -1){
1523
free(delaystring);
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1993
1527
free(delaystring);
1994
perror_plus("setenv");
1995
_exit(EX_OSERR);
1996
}
1997
free(delaystring);
1998
if(connect_to != NULL){
1999
ret = setenv("CONNECT", connect_to, 1);
2000
if(ret == -1){
2001
perror_plus("setenv");
2002
_exit(EX_OSERR);
2003
}
2004
}
2005
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2006
direntry->d_name,
2007
O_RDONLY));
2008
if(hook_fd == -1){
2009
perror_plus("openat");
2010
_exit(EXIT_FAILURE);
2011
}
2012
if(close(hookdir_fd) == -1){
2013
perror_plus("close");
2014
_exit(EXIT_FAILURE);
2015
}
2016
ret = dup2(devnull, STDIN_FILENO);
2017
if(ret == -1){
2018
perror_plus("dup2(devnull, STDIN_FILENO)");
2019
_exit(EX_OSERR);
2020
}
2021
ret = close(devnull);
2022
if(ret == -1){
2023
perror_plus("close");
2024
_exit(EX_OSERR);
2025
}
2026
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2027
if(ret == -1){
2028
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2029
_exit(EX_OSERR);
2030
}
2031
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2032
environ) == -1){
2033
perror_plus("fexecve");
2034
_exit(EXIT_FAILURE);
2035
}
2036
} else {
2037
if(hook_pid == -1){
2038
perror_plus("fork");
2039
free(direntry);
2040
continue;
2041
}
2042
int status;
2043
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2044
perror_plus("waitpid");
2045
free(direntry);
2046
continue;
2047
}
2048
if(WIFEXITED(status)){
2049
if(WEXITSTATUS(status) != 0){
2050
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2051
" with status %d\n", direntry->d_name,
2052
WEXITSTATUS(status));
2053
free(direntry);
2054
continue;
2055
}
2056
} else if(WIFSIGNALED(status)){
2057
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2058
" signal %d\n", direntry->d_name,
2059
WTERMSIG(status));
2060
free(direntry);
2061
continue;
1528
if(connect_to != NULL){
1529
ret = setenv("CONNECT", connect_to, 1);
1530
if(ret == -1){
1531
perror_plus("setenv");
1532
_exit(EX_OSERR);
1533
}
1534
}
1535
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1536
perror_plus("execl");
1537
_exit(EXIT_FAILURE);
1538
}
2062
1539
} else {
2063
fprintf_plus(stderr, "Warning: network hook \"%s\""
2064
" crashed\n", direntry->d_name);
2065
free(direntry);
2066
continue;
2067
}
2068
}
2069
if(debug){
2070
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2071
direntry->d_name);
2072
}
2073
free(direntry);
2074
}
2075
free(direntries);
2076
if(close(hookdir_fd) == -1){
2077
perror_plus("close");
2078
} else {
2079
hookdir_fd = -1;
2080
}
2081
close(devnull);
1540
int status;
1541
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1542
perror_plus("waitpid");
1543
free(fullname);
1544
continue;
1545
}
1546
if(WIFEXITED(status)){
1547
if(WEXITSTATUS(status) != 0){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1549
" with status %d\n", direntry->d_name,
1550
WEXITSTATUS(status));
1551
free(fullname);
1552
continue;
1553
}
1554
} else if(WIFSIGNALED(status)){
1555
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1556
" signal %d\n", direntry->d_name,
1557
WTERMSIG(status));
1558
free(fullname);
1559
continue;
1560
} else {
1561
fprintf_plus(stderr, "Warning: network hook \"%s\""
1562
" crashed\n", direntry->d_name);
1563
free(fullname);
1564
continue;
1565
}
1566
}
1567
free(fullname);
1568
if(debug){
1569
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1570
direntry->d_name);
1571
}
1572
}
1573
close(devnull);
1574
}
1575
return true;
2082
1576
}
2083
1577
2084
__attribute__((nonnull, warn_unused_result))
2085
int bring_up_interface(const char *const interface,
2086
const float delay){
2087
int old_errno = errno;
2088
int ret;
1578
error_t bring_up_interface(const char *const interface,
1579
const float delay){
1580
int sd = -1;
1581
error_t old_errno = errno;
1582
error_t ret_errno = 0;
1583
int ret, ret_setflags;
2089
1584
struct ifreq network;
2090
1585
unsigned int if_index = if_nametoindex(interface);
2091
1586
if(if_index == 0){
2100
1595
}
2101
1596
2102
1597
if(not interface_is_up(interface)){
2103
int ret_errno = 0;
2104
int ioctl_errno = 0;
2105
if(not get_flags(interface, &network)){
1598
if(not get_flags(interface, &network) and debug){
2106
1599
ret_errno = errno;
2107
1600
fprintf_plus(stderr, "Failed to get flags for interface "
2108
1601
"\"%s\"\n", interface);
2109
errno = old_errno;
2110
1602
return ret_errno;
2111
1603
}
2112
network.ifr_flags |= IFF_UP; /* set flag */
1604
network.ifr_flags |= IFF_UP;
2113
1605
2114
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2115
if(sd == -1){
1606
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1607
if(sd < 0){
2116
1608
ret_errno = errno;
2117
1609
perror_plus("socket");
2118
1610
errno = old_errno;
2119
1611
return ret_errno;
2120
1612
}
2121
1613
2122
1614
if(quit_now){
2123
ret = close(sd);
2124
if(ret == -1){
2125
perror_plus("close");
2126
}
1615
close(sd);
2127
1616
errno = old_errno;
2128
1617
return EINTR;
2129
1618
}
2133
1622
interface);
2134
1623
}
2135
1624
2136
/* Raise privileges */
2137
ret_errno = raise_privileges();
2138
if(ret_errno != 0){
2139
errno = ret_errno;
2140
perror_plus("Failed to raise privileges");
2141
}
1625
/* Raise priviliges */
1626
raise_privileges();
2142
1627
2143
1628
#ifdef __linux__
2144
int ret_linux;
2145
bool restore_loglevel = false;
2146
if(ret_errno == 0){
2147
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2148
messages about the network interface to mess up the prompt */
2149
ret_linux = klogctl(8, NULL, 5);
2150
if(ret_linux == -1){
2151
perror_plus("klogctl");
2152
} else {
2153
restore_loglevel = true;
2154
}
1629
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1630
messages about the network interface to mess up the prompt */
1631
int ret_linux = klogctl(8, NULL, 5);
1632
bool restore_loglevel = true;
1633
if(ret_linux == -1){
1634
restore_loglevel = false;
1635
perror_plus("klogctl");
2155
1636
}
2156
1637
#endif /* __linux__ */
2157
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2158
ioctl_errno = errno;
1638
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1639
ret_errno = errno;
2159
1640
#ifdef __linux__
2160
1641
if(restore_loglevel){
2161
1642
ret_linux = klogctl(7, NULL, 0);
2165
1646
}
2166
1647
#endif /* __linux__ */
2167
1648
2168
/* If raise_privileges() succeeded above */
2169
if(ret_errno == 0){
2170
/* Lower privileges */
2171
ret_errno = lower_privileges();
2172
if(ret_errno != 0){
2173
errno = ret_errno;
2174
perror_plus("Failed to lower privileges");
2175
}
2176
}
1649
/* Lower privileges */
1650
lower_privileges();
2177
1651
2178
1652
/* Close the socket */
2179
ret = close(sd);
1653
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2180
1654
if(ret == -1){
2181
1655
perror_plus("close");
2182
1656
}
2183
1657
2184
1658
if(ret_setflags == -1){
2185
errno = ioctl_errno;
1659
errno = ret_errno;
2186
1660
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2187
1661
errno = old_errno;
2188
return ioctl_errno;
1662
return ret_errno;
2189
1663
}
2190
1664
} else if(debug){
2191
1665
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2209
1683
return 0;
2210
1684
}
2211
1685
2212
__attribute__((nonnull, warn_unused_result))
2213
int take_down_interface(const char *const interface){
2214
int old_errno = errno;
1686
error_t take_down_interface(const char *const interface){
1687
int sd = -1;
1688
error_t old_errno = errno;
1689
error_t ret_errno = 0;
1690
int ret, ret_setflags;
2215
1691
struct ifreq network;
2216
1692
unsigned int if_index = if_nametoindex(interface);
2217
1693
if(if_index == 0){
2220
1696
return ENXIO;
2221
1697
}
2222
1698
if(interface_is_up(interface)){
2223
int ret_errno = 0;
2224
int ioctl_errno = 0;
2225
1699
if(not get_flags(interface, &network) and debug){
2226
1700
ret_errno = errno;
2227
1701
fprintf_plus(stderr, "Failed to get flags for interface "
2228
1702
"\"%s\"\n", interface);
2229
errno = old_errno;
2230
1703
return ret_errno;
2231
1704
}
2232
1705
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2233
1706
2234
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2235
if(sd == -1){
1707
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1708
if(sd < 0){
2236
1709
ret_errno = errno;
2237
1710
perror_plus("socket");
2238
1711
errno = old_errno;
2244
1717
interface);
2245
1718
}
2246
1719
2247
/* Raise privileges */
2248
ret_errno = raise_privileges();
2249
if(ret_errno != 0){
2250
errno = ret_errno;
2251
perror_plus("Failed to raise privileges");
2252
}
2253
2254
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2255
ioctl_errno = errno;
2256
2257
/* If raise_privileges() succeeded above */
2258
if(ret_errno == 0){
2259
/* Lower privileges */
2260
ret_errno = lower_privileges();
2261
if(ret_errno != 0){
2262
errno = ret_errno;
2263
perror_plus("Failed to lower privileges");
2264
}
2265
}
1720
/* Raise priviliges */
1721
raise_privileges();
1722
1723
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1724
ret_errno = errno;
1725
1726
/* Lower privileges */
1727
lower_privileges();
2266
1728
2267
1729
/* Close the socket */
2268
int ret = close(sd);
1730
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2269
1731
if(ret == -1){
2270
1732
perror_plus("close");
2271
1733
}
2272
1734
2273
1735
if(ret_setflags == -1){
2274
errno = ioctl_errno;
1736
errno = ret_errno;
2275
1737
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2276
1738
errno = old_errno;
2277
return ioctl_errno;
1739
return ret_errno;
2278
1740
}
2279
1741
} else if(debug){
2280
1742
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2286
1748
}
2287
1749
2288
1750
int main(int argc, char *argv[]){
2289
mandos_context mc = { .server = NULL, .dh_bits = 0,
2290
.priority = "SECURE256:!CTYPE-X.509"
2291
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2292
.current_server = NULL, .interfaces = NULL,
2293
.interfaces_size = 0 };
2294
1751
AvahiSServiceBrowser *sb = NULL;
2295
1752
error_t ret_errno;
2296
1753
int ret;
2297
1754
intmax_t tmpmax;
2298
1755
char *tmp;
2299
1756
int exitcode = EXIT_SUCCESS;
1757
char *interfaces = NULL;
1758
size_t interfaces_size = 0;
2300
1759
char *interfaces_to_take_down = NULL;
2301
1760
size_t interfaces_to_take_down_size = 0;
2302
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2303
char old_tempdir[] = "/tmp/mandosXXXXXX";
2304
char *tempdir = NULL;
1761
char tempdir[] = "/tmp/mandosXXXXXX";
1762
bool tempdir_created = false;
2305
1763
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2306
1764
const char *seckey = PATHDIR "/" SECKEY;
2307
1765
const char *pubkey = PATHDIR "/" PUBKEY;
2308
const char *dh_params_file = NULL;
2309
1766
char *interfaces_hooks = NULL;
1767
size_t interfaces_hooks_size = 0;
2310
1768
2311
1769
bool gnutls_initialized = false;
2312
1770
bool gpgme_initialized = false;
2364
1822
.doc = "Bit length of the prime number used in the"
2365
1823
" Diffie-Hellman key exchange",
2366
1824
.group = 2 },
2367
{ .name = "dh-params", .key = 134,
2368
.arg = "FILE",
2369
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2370
" for the Diffie-Hellman key exchange",
2371
.group = 2 },
2372
1825
{ .name = "priority", .key = 130,
2373
1826
.arg = "STRING",
2374
1827
.doc = "GnuTLS priority string for the TLS handshake",
2408
1861
connect_to = arg;
2409
1862
break;
2410
1863
case 'i': /* --interface */
2411
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2412
arg, (int)',');
1864
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1865
(int)',');
2413
1866
if(ret_errno != 0){
2414
1867
argp_error(state, "%s", strerror(ret_errno));
2415
1868
}
2429
1882
}
2430
1883
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2431
1884
break;
2432
case 134: /* --dh-params */
2433
dh_params_file = arg;
2434
break;
2435
1885
case 130: /* --priority */
2436
1886
mc.priority = arg;
2437
1887
break;
2477
1927
.args_doc = "",
2478
1928
.doc = "Mandos client -- Get and decrypt"
2479
1929
" passwords from a Mandos server" };
2480
ret_errno = argp_parse(&argp, argc, argv,
2481
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2482
switch(ret_errno){
1930
ret = argp_parse(&argp, argc, argv,
1931
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1932
switch(ret){
2483
1933
case 0:
2484
1934
break;
2485
1935
case ENOMEM:
2486
1936
default:
2487
errno = ret_errno;
1937
errno = ret;
2488
1938
perror_plus("argp_parse");
2489
1939
exitcode = EX_OSERR;
2490
1940
goto end;
2493
1943
goto end;
2494
1944
}
2495
1945
}
2496
1946
2497
1947
{
2498
1948
/* Work around Debian bug #633582:
2499
1949
<http://bugs.debian.org/633582> */
2500
1950
2501
/* Re-raise privileges */
2502
ret = raise_privileges();
2503
if(ret != 0){
2504
errno = ret;
2505
perror_plus("Failed to raise privileges");
2506
} else {
1951
/* Re-raise priviliges */
1952
if(raise_privileges() == 0){
2507
1953
struct stat st;
2508
1954
2509
1955
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2523
1969
}
2524
1970
}
2525
1971
}
2526
close(seckey_fd);
1972
TEMP_FAILURE_RETRY(close(seckey_fd));
2527
1973
}
2528
1974
}
2529
1975
2530
1976
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2531
1977
int pubkey_fd = open(pubkey, O_RDONLY);
2532
1978
if(pubkey_fd == -1){
2544
1990
}
2545
1991
}
2546
1992
}
2547
close(pubkey_fd);
2548
}
2549
}
2550
2551
if(dh_params_file != NULL
2552
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2553
int dhparams_fd = open(dh_params_file, O_RDONLY);
2554
if(dhparams_fd == -1){
2555
perror_plus("open");
2556
} else {
2557
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2558
if(ret == -1){
2559
perror_plus("fstat");
2560
} else {
2561
if(S_ISREG(st.st_mode)
2562
and st.st_uid == 0 and st.st_gid == 0){
2563
ret = fchown(dhparams_fd, uid, gid);
2564
if(ret == -1){
2565
perror_plus("fchown");
2566
}
2567
}
2568
}
2569
close(dhparams_fd);
2570
}
2571
}
2572
1993
TEMP_FAILURE_RETRY(close(pubkey_fd));
1994
}
1995
}
1996
2573
1997
/* Lower privileges */
2574
ret = lower_privileges();
2575
if(ret != 0){
2576
errno = ret;
2577
perror_plus("Failed to lower privileges");
1998
errno = 0;
1999
ret = seteuid(uid);
2000
if(ret == -1){
2001
perror_plus("seteuid");
2578
2002
}
2579
2003
}
2580
2004
}
2581
2005
2582
/* Remove invalid interface names (except "none") */
2006
/* Remove empty interface names */
2583
2007
{
2584
2008
char *interface = NULL;
2585
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2009
while((interface = argz_next(interfaces, interfaces_size,
2586
2010
interface))){
2587
if(strcmp(interface, "none") != 0
2588
and if_nametoindex(interface) == 0){
2589
if(interface[0] != '\0'){
2011
if(if_nametoindex(interface) == 0){
2012
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2590
2013
fprintf_plus(stderr, "Not using nonexisting interface"
2591
2014
" \"%s\"\n", interface);
2592
2015
}
2593
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2016
argz_delete(&interfaces, &interfaces_size, interface);
2594
2017
interface = NULL;
2595
2018
}
2596
2019
}
2598
2021
2599
2022
/* Run network hooks */
2600
2023
{
2601
if(mc.interfaces != NULL){
2602
interfaces_hooks = malloc(mc.interfaces_size);
2024
2025
if(interfaces != NULL){
2026
interfaces_hooks = malloc(interfaces_size);
2603
2027
if(interfaces_hooks == NULL){
2604
2028
perror_plus("malloc");
2605
2029
goto end;
2606
2030
}
2607
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2608
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2609
}
2610
run_network_hooks("start", interfaces_hooks != NULL ?
2611
interfaces_hooks : "", delay);
2031
memcpy(interfaces_hooks, interfaces, interfaces_size);
2032
interfaces_hooks_size = interfaces_size;
2033
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2034
(int)',');
2035
}
2036
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2037
interfaces_hooks : "", delay)){
2038
goto end;
2039
}
2612
2040
}
2613
2041
2614
2042
if(not debug){
2619
2047
from the signal handler */
2620
2048
/* Initialize the pseudo-RNG for Avahi */
2621
2049
srand((unsigned int) time(NULL));
2622
simple_poll = avahi_simple_poll_new();
2623
if(simple_poll == NULL){
2050
mc.simple_poll = avahi_simple_poll_new();
2051
if(mc.simple_poll == NULL){
2624
2052
fprintf_plus(stderr,
2625
2053
"Avahi: Failed to create simple poll object.\n");
2626
2054
exitcode = EX_UNAVAILABLE;
2691
2119
}
2692
2120
2693
2121
/* If no interfaces were specified, make a list */
2694
if(mc.interfaces == NULL){
2695
struct dirent **direntries = NULL;
2122
if(interfaces == NULL){
2123
struct dirent **direntries;
2696
2124
/* Look for any good interfaces */
2697
2125
ret = scandir(sys_class_net, &direntries, good_interface,
2698
2126
alphasort);
2699
2127
if(ret >= 1){
2700
2128
/* Add all found interfaces to interfaces list */
2701
2129
for(int i = 0; i < ret; ++i){
2702
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2130
ret_errno = argz_add(&interfaces, &interfaces_size,
2703
2131
direntries[i]->d_name);
2704
2132
if(ret_errno != 0){
2705
errno = ret_errno;
2706
2133
perror_plus("argz_add");
2707
free(direntries[i]);
2708
2134
continue;
2709
2135
}
2710
2136
if(debug){
2711
2137
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2712
2138
direntries[i]->d_name);
2713
2139
}
2714
free(direntries[i]);
2715
2140
}
2716
2141
free(direntries);
2717
2142
} else {
2718
if(ret == 0){
2719
free(direntries);
2720
}
2143
free(direntries);
2721
2144
fprintf_plus(stderr, "Could not find a network interface\n");
2722
2145
exitcode = EXIT_FAILURE;
2723
2146
goto end;
2724
2147
}
2725
2148
}
2726
2149
2727
/* Bring up interfaces which are down, and remove any "none"s */
2728
{
2150
/* If we only got one interface, explicitly use only that one */
2151
if(argz_count(interfaces, interfaces_size) == 1){
2152
if(debug){
2153
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2154
interfaces);
2155
}
2156
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2157
}
2158
2159
/* Bring up interfaces which are down */
2160
if(not (argz_count(interfaces, interfaces_size) == 1
2161
and strcmp(interfaces, "none") == 0)){
2729
2162
char *interface = NULL;
2730
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2163
while((interface = argz_next(interfaces, interfaces_size,
2731
2164
interface))){
2732
/* If interface name is "none", stop bringing up interfaces.
2733
Also remove all instances of "none" from the list */
2734
if(strcmp(interface, "none") == 0){
2735
argz_delete(&mc.interfaces, &mc.interfaces_size,
2736
interface);
2737
interface = NULL;
2738
while((interface = argz_next(mc.interfaces,
2739
mc.interfaces_size, interface))){
2740
if(strcmp(interface, "none") == 0){
2741
argz_delete(&mc.interfaces, &mc.interfaces_size,
2742
interface);
2743
interface = NULL;
2744
}
2745
}
2746
break;
2747
}
2748
2165
bool interface_was_up = interface_is_up(interface);
2749
errno = bring_up_interface(interface, delay);
2166
ret = bring_up_interface(interface, delay);
2750
2167
if(not interface_was_up){
2751
if(errno != 0){
2752
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2753
" %s\n", interface, strerror(errno));
2168
if(ret != 0){
2169
errno = ret;
2170
perror_plus("Failed to bring up interface");
2754
2171
} else {
2755
errno = argz_add(&interfaces_to_take_down,
2756
&interfaces_to_take_down_size,
2757
interface);
2758
if(errno != 0){
2759
perror_plus("argz_add");
2760
}
2172
ret_errno = argz_add(&interfaces_to_take_down,
2173
&interfaces_to_take_down_size,
2174
interface);
2761
2175
}
2762
2176
}
2763
2177
}
2178
free(interfaces);
2179
interfaces = NULL;
2180
interfaces_size = 0;
2764
2181
if(debug and (interfaces_to_take_down == NULL)){
2765
2182
fprintf_plus(stderr, "No interfaces were brought up\n");
2766
2183
}
2767
2184
}
2768
2185
2769
/* If we only got one interface, explicitly use only that one */
2770
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2771
if(debug){
2772
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2773
mc.interfaces);
2774
}
2775
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2776
}
2777
2778
2186
if(quit_now){
2779
2187
goto end;
2780
2188
}
2781
2189
2782
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2190
ret = init_gnutls_global(pubkey, seckey);
2783
2191
if(ret == -1){
2784
2192
fprintf_plus(stderr, "init_gnutls_global failed\n");
2785
2193
exitcode = EX_UNAVAILABLE;
2792
2200
goto end;
2793
2201
}
2794
2202
2795
/* Try /run/tmp before /tmp */
2796
tempdir = mkdtemp(run_tempdir);
2797
if(tempdir == NULL and errno == ENOENT){
2798
if(debug){
2799
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2800
run_tempdir, old_tempdir);
2801
}
2802
tempdir = mkdtemp(old_tempdir);
2803
}
2804
if(tempdir == NULL){
2203
if(mkdtemp(tempdir) == NULL){
2805
2204
perror_plus("mkdtemp");
2806
2205
goto end;
2807
2206
}
2207
tempdir_created = true;
2808
2208
2809
2209
if(quit_now){
2810
2210
goto end;
2811
2211
}
2812
2212
2813
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2213
if(not init_gpgme(pubkey, seckey, tempdir)){
2814
2214
fprintf_plus(stderr, "init_gpgme failed\n");
2815
2215
exitcode = EX_UNAVAILABLE;
2816
2216
goto end;
2846
2246
exitcode = EX_USAGE;
2847
2247
goto end;
2848
2248
}
2849
2249
2850
2250
if(quit_now){
2851
2251
goto end;
2852
2252
}
2873
2273
}
2874
2274
2875
2275
while(not quit_now){
2876
ret = start_mandos_communication(address, port, if_index, af,
2877
&mc);
2276
ret = start_mandos_communication(address, port, if_index, af);
2878
2277
if(quit_now or ret == 0){
2879
2278
break;
2880
2279
}
2882
2281
fprintf_plus(stderr, "Retrying in %d seconds\n",
2883
2282
(int)retry_interval);
2884
2283
}
2885
sleep((unsigned int)retry_interval);
2284
sleep((int)retry_interval);
2886
2285
}
2887
2286
2888
if(not quit_now){
2287
if (not quit_now){
2889
2288
exitcode = EXIT_SUCCESS;
2890
2289
}
2891
2290
2906
2305
config.publish_domain = 0;
2907
2306
2908
2307
/* Allocate a new server */
2909
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2910
&config, NULL, NULL, &ret);
2308
mc.server = avahi_server_new(avahi_simple_poll_get
2309
(mc.simple_poll), &config, NULL,
2310
NULL, &ret_errno);
2911
2311
2912
2312
/* Free the Avahi configuration data */
2913
2313
avahi_server_config_free(&config);
2916
2316
/* Check if creating the Avahi server object succeeded */
2917
2317
if(mc.server == NULL){
2918
2318
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2919
avahi_strerror(ret));
2319
avahi_strerror(ret_errno));
2920
2320
exitcode = EX_UNAVAILABLE;
2921
2321
goto end;
2922
2322
}
2928
2328
/* Create the Avahi service browser */
2929
2329
sb = avahi_s_service_browser_new(mc.server, if_index,
2930
2330
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2931
NULL, 0, browse_callback,
2932
(void *)&mc);
2331
NULL, 0, browse_callback, NULL);
2933
2332
if(sb == NULL){
2934
2333
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2935
2334
avahi_strerror(avahi_server_errno(mc.server)));
2946
2345
if(debug){
2947
2346
fprintf_plus(stderr, "Starting Avahi loop search\n");
2948
2347
}
2949
2950
ret = avahi_loop_with_timeout(simple_poll,
2951
(int)(retry_interval * 1000), &mc);
2348
2349
ret = avahi_loop_with_timeout(mc.simple_poll,
2350
(int)(retry_interval * 1000));
2952
2351
if(debug){
2953
2352
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2954
2353
(ret == 0) ? "successfully" : "with error");
2961
2360
}
2962
2361
2963
2362
/* Cleanup things */
2964
free(mc.interfaces);
2965
2966
2363
if(sb != NULL)
2967
2364
avahi_s_service_browser_free(sb);
2968
2365
2969
2366
if(mc.server != NULL)
2970
2367
avahi_server_free(mc.server);
2971
2368
2972
if(simple_poll != NULL)
2973
avahi_simple_poll_free(simple_poll);
2369
if(mc.simple_poll != NULL)
2370
avahi_simple_poll_free(mc.simple_poll);
2974
2371
2975
2372
if(gnutls_initialized){
2976
2373
gnutls_certificate_free_credentials(mc.cred);
2374
gnutls_global_deinit();
2977
2375
gnutls_dh_params_deinit(mc.dh_params);
2978
2376
}
2979
2377
2987
2385
mc.current_server->prev->next = NULL;
2988
2386
while(mc.current_server != NULL){
2989
2387
server *next = mc.current_server->next;
2990
#ifdef __GNUC__
2991
#pragma GCC diagnostic push
2992
#pragma GCC diagnostic ignored "-Wcast-qual"
2993
#endif
2994
free((char *)(mc.current_server->ip));
2995
#ifdef __GNUC__
2996
#pragma GCC diagnostic pop
2997
#endif
2998
2388
free(mc.current_server);
2999
2389
mc.current_server = next;
3000
2390
}
3001
2391
}
3002
2392
3003
/* Re-raise privileges */
2393
/* Re-raise priviliges */
3004
2394
{
3005
ret = raise_privileges();
3006
if(ret != 0){
3007
errno = ret;
3008
perror_plus("Failed to raise privileges");
3009
} else {
3010
3011
/* Run network hooks */
3012
run_network_hooks("stop", interfaces_hooks != NULL ?
3013
interfaces_hooks : "", delay);
3014
3015
/* Take down the network interfaces which were brought up */
3016
{
3017
char *interface = NULL;
3018
while((interface=argz_next(interfaces_to_take_down,
3019
interfaces_to_take_down_size,
3020
interface))){
3021
ret = take_down_interface(interface);
3022
if(ret != 0){
3023
errno = ret;
3024
perror_plus("Failed to take down interface");
3025
}
3026
}
3027
if(debug and (interfaces_to_take_down == NULL)){
3028
fprintf_plus(stderr, "No interfaces needed to be taken"
3029
" down\n");
3030
}
3031
}
3032
}
3033
3034
ret = lower_privileges_permanently();
3035
if(ret != 0){
3036
errno = ret;
3037
perror_plus("Failed to lower privileges permanently");
3038
}
2395
raise_privileges();
2396
2397
/* Run network hooks */
2398
run_network_hooks("stop", interfaces_hooks != NULL ?
2399
interfaces_hooks : "", delay);
2400
2401
/* Take down the network interfaces which were brought up */
2402
{
2403
char *interface = NULL;
2404
while((interface=argz_next(interfaces_to_take_down,
2405
interfaces_to_take_down_size,
2406
interface))){
2407
ret_errno = take_down_interface(interface);
2408
if(ret_errno != 0){
2409
errno = ret_errno;
2410
perror_plus("Failed to take down interface");
2411
}
2412
}
2413
if(debug and (interfaces_to_take_down == NULL)){
2414
fprintf_plus(stderr, "No interfaces needed to be taken"
2415
" down\n");
2416
}
2417
}
2418
2419
lower_privileges_permanently();
3039
2420
}
3040
2421
3041
2422
free(interfaces_to_take_down);
3042
2423
free(interfaces_hooks);
3043
2424
3044
void clean_dir_at(int base, const char * const dirname,
3045
uintmax_t level){
2425
/* Removes the GPGME temp directory and all files inside */
2426
if(tempdir_created){
3046
2427
struct dirent **direntries = NULL;
3047
int dret;
3048
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3049
O_RDONLY
3050
| O_NOFOLLOW
3051
| O_DIRECTORY
3052
| O_PATH));
3053
if(dir_fd == -1){
3054
perror_plus("open");
3055
}
3056
int numentries = scandirat(dir_fd, ".", &direntries,
3057
notdotentries, alphasort);
3058
if(numentries >= 0){
2428
struct dirent *direntry = NULL;
2429
int numentries = scandir(tempdir, &direntries, notdotentries,
2430
alphasort);
2431
if (numentries > 0){
3059
2432
for(int i = 0; i < numentries; i++){
3060
if(debug){
3061
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3062
dirname, direntries[i]->d_name);
3063
}
3064
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3065
if(dret == -1){
3066
if(errno == EISDIR){
3067
dret = unlinkat(dir_fd, direntries[i]->d_name,
3068
AT_REMOVEDIR);
3069
}
3070
if((dret == -1) and (errno == ENOTEMPTY)
3071
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3072
== 0) and (level == 0)){
3073
/* Recurse only in this special case */
3074
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3075
dret = 0;
3076
}
3077
if(dret == -1){
3078
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3079
direntries[i]->d_name, strerror(errno));
3080
}
3081
}
3082
free(direntries[i]);
3083
}
3084
3085
/* need to clean even if 0 because man page doesn't specify */
3086
free(direntries);
3087
if(numentries == -1){
3088
perror_plus("scandirat");
3089
}
3090
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3091
if(dret == -1 and errno != ENOENT){
3092
perror_plus("rmdir");
3093
}
3094
} else {
3095
perror_plus("scandirat");
3096
}
3097
close(dir_fd);
3098
}
3099
3100
/* Removes the GPGME temp directory and all files inside */
3101
if(tempdir != NULL){
3102
clean_dir_at(-1, tempdir, 0);
2433
direntry = direntries[i];
2434
char *fullname = NULL;
2435
ret = asprintf(&fullname, "%s/%s", tempdir,
2436
direntry->d_name);
2437
if(ret < 0){
2438
perror_plus("asprintf");
2439
continue;
2440
}
2441
ret = remove(fullname);
2442
if(ret == -1){
2443
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2444
strerror(errno));
2445
}
2446
free(fullname);
2447
}
2448
}
2449
2450
/* need to clean even if 0 because man page doesn't specify */
2451
free(direntries);
2452
if (numentries == -1){
2453
perror_plus("scandir");
2454
}
2455
ret = rmdir(tempdir);
2456
if(ret == -1 and errno != ENOENT){
2457
perror_plus("rmdir");
2458
}
3103
2459
}
3104
2460
3105
2461
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0