To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 869
- compare with another revision
- download diff
- download tarball
- view history from revision 869
- Committer: Teddy Hogeborn
- Date: 2016-07-10 03:43:48 UTC
- Revision ID: teddy@recompile.se-20160710034348-5qc50yeyyn7peirm
Update RFC references to their modern equivalents.
* plugins.d/mandos-client.xml (SEE ALSO): Replace RFC 4346 (TLS 1.1)
with RFC 5246 (TLS 1.2), and replace RFC 5081 (TLS OpenPGP) with its
replacement RFC 6091.
* plugins.d/mandos-client.xml (SEE ALSO): Replace RFC 4346 (TLS 1.1)
with RFC 5246 (TLS 1.2), and replace RFC 5081 (TLS OpenPGP) with its
replacement RFC 6091.
- files added:
- bugs.xml
- debian/upstream
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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() */
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
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
65
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
66
EAI_SYSTEM, ENETUNREACH,
67
EHOSTUNREACH, ECONNREFUSED, EPROTO,
68
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
69
ENOTEMPTY,
66
70
program_invocation_short_name */
67
71
#include <time.h> /* nanosleep(), time(), sleep() */
68
72
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
77
*/
74
78
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
79
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
80
setgid(), pause(), _exit(),
81
unlinkat() */
82
#include <arpa/inet.h> /* inet_pton(), htons() */
78
83
#include <iso646.h> /* not, or, and */
79
84
#include <argp.h> /* struct argp_option, error_t, struct
80
85
argp_state, struct argp,
88
93
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
94
WEXITSTATUS(), WTERMSIG() */
90
95
#include <grp.h> /* setgroups() */
96
#include <argz.h> /* argz_add_sep(), argz_next(),
97
argz_delete(), argz_append(),
98
argz_stringify(), argz_add(),
99
argz_count() */
100
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
101
EAI_SYSTEM, gai_strerror() */
91
102
92
103
#ifdef __linux__
93
104
#include <sys/klog.h> /* klogctl() */
135
146
static const char sys_class_net[] = "/sys/class/net";
136
147
char *connect_to = NULL;
137
148
const char *hookdir = HOOKDIR;
149
int hookdir_fd = -1;
150
uid_t uid = 65534;
151
gid_t gid = 65534;
138
152
139
153
/* Doubly linked list that need to be circularly linked when used */
140
154
typedef struct server{
141
155
const char *ip;
142
uint16_t port;
156
in_port_t port;
143
157
AvahiIfIndex if_index;
144
158
int af;
145
159
struct timespec last_seen;
149
163
150
164
/* Used for passing in values through the Avahi callback functions */
151
165
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
166
AvahiServer *server;
154
167
gnutls_certificate_credentials_t cred;
155
168
unsigned int dh_bits;
157
170
const char *priority;
158
171
gpgme_ctx_t ctx;
159
172
server *current_server;
173
char *interfaces;
174
size_t interfaces_size;
160
175
} mandos_context;
161
176
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
177
/* global so signal handler can reach it*/
178
AvahiSimplePoll *simple_poll;
167
179
168
180
sig_atomic_t quit_now = 0;
169
181
int signal_received = 0;
177
189
perror(print_text);
178
190
}
179
191
180
__attribute__((format (gnu_printf, 2, 3)))
192
__attribute__((format (gnu_printf, 2, 3), nonnull))
181
193
int fprintf_plus(FILE *stream, const char *format, ...){
182
194
va_list ap;
183
195
va_start (ap, format);
184
196
185
197
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
198
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
199
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
200
}
189
201
190
202
/*
192
204
* bytes. "buffer_capacity" is how much is currently allocated,
193
205
* "buffer_length" is how much is already used.
194
206
*/
207
__attribute__((nonnull, warn_unused_result))
195
208
size_t incbuffer(char **buffer, size_t buffer_length,
196
209
size_t buffer_capacity){
197
210
if(buffer_length + BUFFER_SIZE > buffer_capacity){
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
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;
200
217
return 0;
201
218
}
219
*buffer = new_buf;
202
220
buffer_capacity += BUFFER_SIZE;
203
221
}
204
222
return buffer_capacity;
205
223
}
206
224
207
225
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
226
__attribute__((nonnull, warn_unused_result))
227
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
228
int af, server **current_server){
210
229
int ret;
211
230
server *new_server = malloc(sizeof(server));
212
231
if(new_server == NULL){
219
238
.af = af };
220
239
if(new_server->ip == NULL){
221
240
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);
222
256
return false;
223
257
}
224
258
/* Special case of first server */
225
if (mc.current_server == NULL){
259
if(*current_server == NULL){
226
260
new_server->next = new_server;
227
261
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
262
*current_server = new_server;
230
263
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
264
/* Place the new server last in the list */
265
new_server->next = *current_server;
266
new_server->prev = (*current_server)->prev;
233
267
new_server->prev->next = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
268
(*current_server)->prev = new_server;
240
269
}
241
270
return true;
242
271
}
244
273
/*
245
274
* Initialize GPGME.
246
275
*/
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
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){
249
281
gpgme_error_t rc;
250
282
gpgme_engine_info_t engine_info;
251
283
252
253
284
/*
254
285
* Helper function to insert pub and seckey to the engine keyring.
255
286
*/
256
bool import_key(const char *filename){
287
bool import_key(const char * const filename){
257
288
int ret;
258
289
int fd;
259
290
gpgme_data_t pgp_data;
271
302
return false;
272
303
}
273
304
274
rc = gpgme_op_import(mc.ctx, pgp_data);
305
rc = gpgme_op_import(mc->ctx, pgp_data);
275
306
if(rc != GPG_ERR_NO_ERROR){
276
307
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
308
gpgme_strsource(rc), gpgme_strerror(rc));
278
309
return false;
279
310
}
280
311
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
312
ret = close(fd);
282
313
if(ret == -1){
283
314
perror_plus("close");
284
315
}
321
352
}
322
353
323
354
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
355
rc = gpgme_new(&(mc->ctx));
325
356
if(rc != GPG_ERR_NO_ERROR){
326
357
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
358
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
340
371
* Decrypt OpenPGP data.
341
372
* Returns -1 on error
342
373
*/
374
__attribute__((nonnull, warn_unused_result))
343
375
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
376
size_t crypto_size,
345
char **plaintext){
377
char **plaintext,
378
mandos_context *mc){
346
379
gpgme_data_t dh_crypto, dh_plain;
347
380
gpgme_error_t rc;
348
381
ssize_t ret;
374
407
375
408
/* Decrypt data from the cryptotext data buffer to the plaintext
376
409
data buffer */
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
410
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
378
411
if(rc != GPG_ERR_NO_ERROR){
379
412
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
413
gpgme_strsource(rc), gpgme_strerror(rc));
381
414
plaintext_length = -1;
382
415
if(debug){
383
416
gpgme_decrypt_result_t result;
384
result = gpgme_op_decrypt_result(mc.ctx);
417
result = gpgme_op_decrypt_result(mc->ctx);
385
418
if(result == NULL){
386
419
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
387
420
} else {
464
497
return plaintext_length;
465
498
}
466
499
467
static const char * safer_gnutls_strerror(int value){
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
470
if(ret == NULL)
471
ret = "(unknown)";
472
return ret;
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){
509
const char *ret = gnutls_strerror(value);
510
return safe_string(ret);
473
511
}
474
512
475
513
/* GnuTLS log function callback */
514
__attribute__((nonnull))
476
515
static void debuggnutls(__attribute__((unused)) int level,
477
516
const char* string){
478
517
fprintf_plus(stderr, "GnuTLS: %s", string);
479
518
}
480
519
520
__attribute__((nonnull(1, 2, 4), warn_unused_result))
481
521
static int init_gnutls_global(const char *pubkeyfilename,
482
const char *seckeyfilename){
522
const char *seckeyfilename,
523
const char *dhparamsfilename,
524
mandos_context *mc){
483
525
int ret;
526
unsigned int uret;
484
527
485
528
if(debug){
486
529
fprintf_plus(stderr, "Initializing GnuTLS\n");
487
530
}
488
531
489
ret = gnutls_global_init();
490
if(ret != GNUTLS_E_SUCCESS){
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
493
return -1;
494
}
495
496
532
if(debug){
497
533
/* "Use a log level over 10 to enable all debugging options."
498
534
* - GnuTLS manual
502
538
}
503
539
504
540
/* OpenPGP credentials */
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
541
ret = gnutls_certificate_allocate_credentials(&mc->cred);
506
542
if(ret != GNUTLS_E_SUCCESS){
507
543
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
544
safer_gnutls_strerror(ret));
509
gnutls_global_deinit();
510
545
return -1;
511
546
}
512
547
518
553
}
519
554
520
555
ret = gnutls_certificate_set_openpgp_key_file
521
(mc.cred, pubkeyfilename, seckeyfilename,
556
(mc->cred, pubkeyfilename, seckeyfilename,
522
557
GNUTLS_OPENPGP_FMT_BASE64);
523
558
if(ret != GNUTLS_E_SUCCESS){
524
559
fprintf_plus(stderr,
530
565
}
531
566
532
567
/* GnuTLS server initialization */
533
ret = gnutls_dh_params_init(&mc.dh_params);
568
ret = gnutls_dh_params_init(&mc->dh_params);
534
569
if(ret != GNUTLS_E_SUCCESS){
535
570
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
571
" initialization: %s\n",
537
572
safer_gnutls_strerror(ret));
538
573
goto globalfail;
539
574
}
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
541
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
544
goto globalfail;
545
}
546
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
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);
548
748
549
749
return 0;
550
750
551
751
globalfail:
552
752
553
gnutls_certificate_free_credentials(mc.cred);
554
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
753
gnutls_certificate_free_credentials(mc->cred);
754
gnutls_dh_params_deinit(mc->dh_params);
556
755
return -1;
557
756
}
558
757
559
static int init_gnutls_session(gnutls_session_t *session){
758
__attribute__((nonnull, warn_unused_result))
759
static int init_gnutls_session(gnutls_session_t *session,
760
mandos_context *mc){
560
761
int ret;
561
762
/* GnuTLS session creation */
562
763
do {
574
775
{
575
776
const char *err;
576
777
do {
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
778
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
578
779
if(quit_now){
579
780
gnutls_deinit(*session);
580
781
return -1;
591
792
592
793
do {
593
794
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
mc.cred);
795
mc->cred);
595
796
if(quit_now){
596
797
gnutls_deinit(*session);
597
798
return -1;
607
808
/* ignore client certificate if any. */
608
809
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
609
810
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
611
612
811
return 0;
613
812
}
614
813
616
815
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
617
816
__attribute__((unused)) const char *txt){}
618
817
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
619
1036
/* Called when a Mandos server is found */
620
static int start_mandos_communication(const char *ip, uint16_t port,
1037
__attribute__((nonnull, warn_unused_result))
1038
static int start_mandos_communication(const char *ip, in_port_t port,
621
1039
AvahiIfIndex if_index,
622
int af){
1040
int af, mandos_context *mc){
623
1041
int ret, tcp_sd = -1;
624
1042
ssize_t sret;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
1043
struct sockaddr_storage to;
629
1044
char *buffer = NULL;
630
1045
char *decrypted_buffer = NULL;
631
1046
size_t buffer_length = 0;
634
1049
int retval = -1;
635
1050
gnutls_session_t session;
636
1051
int pf; /* Protocol family */
1052
bool route_added = false;
637
1053
638
1054
errno = 0;
639
1055
655
1071
return -1;
656
1072
}
657
1073
658
ret = init_gnutls_session(&session);
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);
659
1107
if(ret != 0){
660
1108
return -1;
661
1109
}
662
1110
663
1111
if(debug){
664
1112
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
1113
PRIuMAX "\n", ip, (uintmax_t)port);
666
1114
}
667
1115
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
669
1117
if(tcp_sd < 0){
670
1118
int e = errno;
671
1119
perror_plus("socket");
678
1126
goto mandos_end;
679
1127
}
680
1128
681
memset(&to, 0, sizeof(to));
682
1129
if(af == AF_INET6){
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
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);
685
1133
} else { /* IPv4 */
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
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);
688
1137
}
689
1138
if(ret < 0 ){
690
1139
int e = errno;
699
1148
goto mandos_end;
700
1149
}
701
1150
if(af == AF_INET6){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
1151
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1152
if(IN6_IS_ADDR_LINKLOCAL
1153
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
709
1154
if(if_index == AVAHI_IF_UNSPEC){
710
1155
fprintf_plus(stderr, "An IPv6 link-local address is"
711
1156
" incomplete without a network interface\n");
713
1158
goto mandos_end;
714
1159
}
715
1160
/* Set the network interface number as scope */
716
to.in6.sin6_scope_id = (uint32_t)if_index;
1161
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
717
1162
}
718
1163
} else {
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
1164
((struct sockaddr_in *)&to)->sin_port = htons(port);
722
1165
}
723
1166
724
1167
if(quit_now){
732
1175
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
1176
perror_plus("if_indextoname");
734
1177
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
1178
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1179
"\n", ip, interface, (uintmax_t)port);
737
1180
}
738
1181
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
1182
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1183
ip, (uintmax_t)port);
741
1184
}
742
1185
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
1186
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
744
const char *pcret;
745
if(af == AF_INET6){
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
sizeof(addrstr));
748
} else {
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
sizeof(addrstr));
751
}
752
if(pcret == NULL){
753
perror_plus("inet_ntop");
754
} else {
755
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
757
}
758
}
759
}
760
761
if(quit_now){
762
errno = EINTR;
763
goto mandos_end;
764
}
765
766
if(af == AF_INET6){
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
768
} else {
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
770
}
771
if(ret < 0){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
int e = errno;
774
perror_plus("connect");
775
errno = e;
776
}
777
goto mandos_end;
778
}
779
780
if(quit_now){
781
errno = EINTR;
782
goto mandos_end;
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
https://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;
783
1267
}
784
1268
785
1269
const char *out = mandos_protocol_version;
821
1305
goto mandos_end;
822
1306
}
823
1307
824
/* Spurious warning from -Wint-to-pointer-cast */
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1308
/* This casting via intptr_t is to eliminate warning about casting
1309
an int to a pointer type. This is exactly how the GnuTLS Guile
1310
function "set-session-transport-fd!" does it. */
1311
gnutls_transport_set_ptr(session,
1312
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
826
1313
827
1314
if(quit_now){
828
1315
errno = EINTR;
933
1420
if(buffer_length > 0){
934
1421
ssize_t decrypted_buffer_size;
935
1422
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
936
&decrypted_buffer);
1423
&decrypted_buffer, mc);
937
1424
if(decrypted_buffer_size >= 0){
938
1425
1426
clearerr(stdout);
939
1427
written = 0;
940
1428
while(written < (size_t) decrypted_buffer_size){
941
1429
if(quit_now){
957
1445
}
958
1446
written += (size_t)ret;
959
1447
}
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
}
960
1458
retval = 0;
961
1459
}
962
1460
}
965
1463
966
1464
mandos_end:
967
1465
{
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
}
968
1472
int e = errno;
969
1473
free(decrypted_buffer);
970
1474
free(buffer);
971
1475
if(tcp_sd >= 0){
972
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1476
ret = close(tcp_sd);
973
1477
}
974
1478
if(ret == -1){
975
1479
if(e == 0){
987
1491
return retval;
988
1492
}
989
1493
1494
__attribute__((nonnull))
990
1495
static void resolve_callback(AvahiSServiceResolver *r,
991
1496
AvahiIfIndex interface,
992
1497
AvahiProtocol proto,
1000
1505
AVAHI_GCC_UNUSED AvahiStringList *txt,
1001
1506
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1002
1507
flags,
1003
AVAHI_GCC_UNUSED void* userdata){
1004
assert(r);
1508
void *mc){
1509
if(r == NULL){
1510
return;
1511
}
1005
1512
1006
1513
/* Called whenever a service has been resolved successfully or
1007
1514
timed out */
1008
1515
1009
1516
if(quit_now){
1517
avahi_s_service_resolver_free(r);
1010
1518
return;
1011
1519
}
1012
1520
1016
1524
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1017
1525
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1018
1526
domain,
1019
avahi_strerror(avahi_server_errno(mc.server)));
1527
avahi_strerror(avahi_server_errno
1528
(((mandos_context*)mc)->server)));
1020
1529
break;
1021
1530
1022
1531
case AVAHI_RESOLVER_FOUND:
1028
1537
PRIdMAX ") on port %" PRIu16 "\n", name,
1029
1538
host_name, ip, (intmax_t)interface, port);
1030
1539
}
1031
int ret = start_mandos_communication(ip, port, interface,
1032
avahi_proto_to_af(proto));
1540
int ret = start_mandos_communication(ip, (in_port_t)port,
1541
interface,
1542
avahi_proto_to_af(proto),
1543
mc);
1033
1544
if(ret == 0){
1034
avahi_simple_poll_quit(mc.simple_poll);
1545
avahi_simple_poll_quit(simple_poll);
1035
1546
} else {
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1547
if(not add_server(ip, (in_port_t)port, interface,
1548
avahi_proto_to_af(proto),
1549
&((mandos_context*)mc)->current_server)){
1038
1550
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
1551
" list\n", name);
1040
1552
}
1053
1565
const char *domain,
1054
1566
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1055
1567
flags,
1056
AVAHI_GCC_UNUSED void* userdata){
1057
assert(b);
1568
void *mc){
1569
if(b == NULL){
1570
return;
1571
}
1058
1572
1059
1573
/* Called whenever a new services becomes available on the LAN or
1060
1574
is removed from the LAN */
1068
1582
case AVAHI_BROWSER_FAILURE:
1069
1583
1070
1584
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
1072
avahi_simple_poll_quit(mc.simple_poll);
1585
avahi_strerror(avahi_server_errno
1586
(((mandos_context*)mc)->server)));
1587
avahi_simple_poll_quit(simple_poll);
1073
1588
return;
1074
1589
1075
1590
case AVAHI_BROWSER_NEW:
1078
1593
the callback function is called the Avahi server will free the
1079
1594
resolver for us. */
1080
1595
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
name, type, domain, protocol, 0,
1083
resolve_callback, NULL) == NULL)
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)
1084
1600
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
1601
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
1602
avahi_strerror(avahi_server_errno
1603
(((mandos_context*)mc)->server)));
1087
1604
break;
1088
1605
1089
1606
case AVAHI_BROWSER_REMOVE:
1108
1625
signal_received = sig;
1109
1626
int old_errno = errno;
1110
1627
/* set main loop to exit */
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
1628
if(simple_poll != NULL){
1629
avahi_simple_poll_quit(simple_poll);
1113
1630
}
1114
1631
errno = old_errno;
1115
1632
}
1116
1633
1634
__attribute__((nonnull, warn_unused_result))
1117
1635
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
1636
int ret;
1637
int old_errno;
1119
1638
1120
1639
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1121
1640
if(s < 0){
1641
old_errno = errno;
1122
1642
perror_plus("socket");
1643
errno = old_errno;
1123
1644
return false;
1124
1645
}
1125
strcpy(ifr->ifr_name, ifname);
1646
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1647
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1126
1648
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
1649
if(ret == -1){
1128
1650
if(debug){
1651
old_errno = errno;
1129
1652
perror_plus("ioctl SIOCGIFFLAGS");
1653
errno = old_errno;
1130
1654
}
1131
1655
return false;
1132
1656
}
1133
1657
return true;
1134
1658
}
1135
1659
1660
__attribute__((nonnull, warn_unused_result))
1136
1661
bool good_flags(const char *ifname, const struct ifreq *ifr){
1137
1662
1138
1663
/* Reject the loopback device */
1180
1705
* corresponds to an acceptable network device.
1181
1706
* (This function is passed to scandir(3) as a filter function.)
1182
1707
*/
1708
__attribute__((nonnull, warn_unused_result))
1183
1709
int good_interface(const struct dirent *if_entry){
1184
1710
if(if_entry->d_name[0] == '.'){
1185
1711
return 0;
1201
1727
}
1202
1728
1203
1729
/*
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1242
}
1243
return 1;
1244
}
1245
1730
* This function determines if a network interface is up.
1731
*/
1732
__attribute__((nonnull, warn_unused_result))
1733
bool interface_is_up(const char *interface){
1734
struct ifreq ifr;
1735
if(not get_flags(interface, &ifr)){
1736
if(debug){
1737
fprintf_plus(stderr, "Failed to get flags for interface "
1738
"\"%s\"\n", interface);
1739
}
1740
return false;
1741
}
1742
1743
return (bool)(ifr.ifr_flags & IFF_UP);
1744
}
1745
1746
/*
1747
* This function determines if a network interface is running
1748
*/
1749
__attribute__((nonnull, warn_unused_result))
1750
bool interface_is_running(const char *interface){
1751
struct ifreq ifr;
1752
if(not get_flags(interface, &ifr)){
1753
if(debug){
1754
fprintf_plus(stderr, "Failed to get flags for interface "
1755
"\"%s\"\n", interface);
1756
}
1757
return false;
1758
}
1759
1760
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1761
}
1762
1763
__attribute__((nonnull, pure, warn_unused_result))
1246
1764
int notdotentries(const struct dirent *direntry){
1247
1765
/* Skip "." and ".." */
1248
1766
if(direntry->d_name[0] == '.'
1255
1773
}
1256
1774
1257
1775
/* Is this directory entry a runnable program? */
1776
__attribute__((nonnull, warn_unused_result))
1258
1777
int runnable_hook(const struct dirent *direntry){
1259
1778
int ret;
1260
1779
size_t sret;
1268
1787
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1269
1788
"abcdefghijklmnopqrstuvwxyz"
1270
1789
"0123456789"
1271
"_-");
1790
"_.-");
1272
1791
if((direntry->d_name)[sret] != '\0'){
1273
1792
/* Contains non-allowed characters */
1274
1793
if(debug){
1278
1797
return 0;
1279
1798
}
1280
1799
1281
char *fullname = NULL;
1282
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1283
if(ret < 0){
1284
perror_plus("asprintf");
1285
return 0;
1286
}
1287
1288
ret = stat(fullname, &st);
1800
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1289
1801
if(ret == -1){
1290
1802
if(debug){
1291
1803
perror_plus("Could not stat hook");
1315
1827
return 1;
1316
1828
}
1317
1829
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1830
__attribute__((nonnull, warn_unused_result))
1831
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1832
mandos_context *mc){
1319
1833
int ret;
1320
1834
struct timespec now;
1321
1835
struct timespec waited_time;
1322
1836
intmax_t block_time;
1323
1837
1324
1838
while(true){
1325
if(mc.current_server == NULL){
1326
if (debug){
1839
if(mc->current_server == NULL){
1840
if(debug){
1327
1841
fprintf_plus(stderr, "Wait until first server is found."
1328
1842
" No timeout!\n");
1329
1843
}
1330
1844
ret = avahi_simple_poll_iterate(s, -1);
1331
1845
} else {
1332
if (debug){
1846
if(debug){
1333
1847
fprintf_plus(stderr, "Check current_server if we should run"
1334
1848
" it, or wait\n");
1335
1849
}
1342
1856
/* Calculating in ms how long time between now and server
1343
1857
who we visted longest time ago. Now - last seen. */
1344
1858
waited_time.tv_sec = (now.tv_sec
1345
- mc.current_server->last_seen.tv_sec);
1859
- mc->current_server->last_seen.tv_sec);
1346
1860
waited_time.tv_nsec = (now.tv_nsec
1347
- mc.current_server->last_seen.tv_nsec);
1861
- mc->current_server->last_seen.tv_nsec);
1348
1862
/* total time is 10s/10,000ms.
1349
1863
Converting to s from ms by dividing by 1,000,
1350
1864
and ns to ms by dividing by 1,000,000. */
1352
1866
- ((intmax_t)waited_time.tv_sec * 1000))
1353
1867
- ((intmax_t)waited_time.tv_nsec / 1000000));
1354
1868
1355
if (debug){
1869
if(debug){
1356
1870
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
1871
block_time);
1358
1872
}
1359
1873
1360
1874
if(block_time <= 0){
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
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);
1365
1879
if(ret == 0){
1366
avahi_simple_poll_quit(mc.simple_poll);
1880
avahi_simple_poll_quit(s);
1367
1881
return 0;
1368
1882
}
1369
1883
ret = clock_gettime(CLOCK_MONOTONIC,
1370
&mc.current_server->last_seen);
1884
&mc->current_server->last_seen);
1371
1885
if(ret == -1){
1372
1886
perror_plus("clock_gettime");
1373
1887
return -1;
1374
1888
}
1375
mc.current_server = mc.current_server->next;
1889
mc->current_server = mc->current_server->next;
1376
1890
block_time = 0; /* Call avahi to find new Mandos
1377
1891
servers, but don't block */
1378
1892
}
1380
1894
ret = avahi_simple_poll_iterate(s, (int)block_time);
1381
1895
}
1382
1896
if(ret != 0){
1383
if (ret > 0 or errno != EINTR){
1897
if(ret > 0 or errno != EINTR){
1384
1898
return (ret != 1) ? ret : 0;
1385
1899
}
1386
1900
}
1387
1901
}
1388
1902
}
1389
1903
1390
bool run_network_hooks(const char *mode, const char *interface,
1904
__attribute__((nonnull))
1905
void run_network_hooks(const char *mode, const char *interface,
1391
1906
const float delay){
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
alphasort);
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);
1397
1925
if(numhooks == -1){
1398
1926
perror_plus("scandir");
1399
} else {
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1405
if(ret < 0){
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);
1941
}
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){
1406
1988
perror_plus("asprintf");
1407
continue;
1408
}
1409
if(debug){
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1411
direntry->d_name);
1412
}
1413
pid_t hook_pid = fork();
1414
if(hook_pid == 0){
1415
/* Child */
1416
/* Raise privileges */
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1428
/* Set group */
1429
errno = 0;
1430
ret = setgid(0);
1431
if(ret == -1){
1432
perror_plus("setgid");
1433
}
1434
/* Reset supplementary groups */
1435
errno = 0;
1436
ret = setgroups(0, NULL);
1437
if(ret == -1){
1438
perror_plus("setgroups");
1439
}
1440
dup2(devnull, STDIN_FILENO);
1441
close(devnull);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1444
if(ret == -1){
1445
perror_plus("setenv");
1446
_exit(EX_OSERR);
1447
}
1448
ret = setenv("DEVICE", interface, 1);
1449
if(ret == -1){
1450
perror_plus("setenv");
1451
_exit(EX_OSERR);
1452
}
1453
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1454
if(ret == -1){
1455
perror_plus("setenv");
1456
_exit(EX_OSERR);
1457
}
1458
ret = setenv("MODE", mode, 1);
1459
if(ret == -1){
1460
perror_plus("setenv");
1461
_exit(EX_OSERR);
1462
}
1463
char *delaystring;
1464
ret = asprintf(&delaystring, "%f", delay);
1465
if(ret == -1){
1466
perror_plus("asprintf");
1467
_exit(EX_OSERR);
1468
}
1469
ret = setenv("DELAY", delaystring, 1);
1470
if(ret == -1){
1471
free(delaystring);
1472
perror_plus("setenv");
1473
_exit(EX_OSERR);
1474
}
1989
_exit(EX_OSERR);
1990
}
1991
ret = setenv("DELAY", delaystring, 1);
1992
if(ret == -1){
1475
1993
free(delaystring);
1476
if(connect_to != NULL){
1477
ret = setenv("CONNECT", connect_to, 1);
1478
if(ret == -1){
1479
perror_plus("setenv");
1480
_exit(EX_OSERR);
1481
}
1482
}
1483
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1484
perror_plus("execl");
1485
_exit(EXIT_FAILURE);
1486
}
1487
} else {
1488
int status;
1489
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1490
perror_plus("waitpid");
1491
free(fullname);
1492
continue;
1493
}
1494
if(WIFEXITED(status)){
1495
if(WEXITSTATUS(status) != 0){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1497
" with status %d\n", direntry->d_name,
1498
WEXITSTATUS(status));
1499
free(fullname);
1500
continue;
1501
}
1502
} else if(WIFSIGNALED(status)){
1503
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1504
" signal %d\n", direntry->d_name,
1505
WTERMSIG(status));
1506
free(fullname);
1507
continue;
1508
} else {
1509
fprintf_plus(stderr, "Warning: network hook \"%s\""
1510
" crashed\n", direntry->d_name);
1511
free(fullname);
1512
continue;
1513
}
1514
}
1515
free(fullname);
1516
if(debug){
1517
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1518
direntry->d_name);
1519
}
1520
}
1521
close(devnull);
1522
}
1523
return true;
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;
2062
} 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);
2082
}
2083
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;
2089
struct ifreq network;
2090
unsigned int if_index = if_nametoindex(interface);
2091
if(if_index == 0){
2092
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2093
errno = old_errno;
2094
return ENXIO;
2095
}
2096
2097
if(quit_now){
2098
errno = old_errno;
2099
return EINTR;
2100
}
2101
2102
if(not interface_is_up(interface)){
2103
int ret_errno = 0;
2104
int ioctl_errno = 0;
2105
if(not get_flags(interface, &network)){
2106
ret_errno = errno;
2107
fprintf_plus(stderr, "Failed to get flags for interface "
2108
"\"%s\"\n", interface);
2109
errno = old_errno;
2110
return ret_errno;
2111
}
2112
network.ifr_flags |= IFF_UP; /* set flag */
2113
2114
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2115
if(sd == -1){
2116
ret_errno = errno;
2117
perror_plus("socket");
2118
errno = old_errno;
2119
return ret_errno;
2120
}
2121
2122
if(quit_now){
2123
ret = close(sd);
2124
if(ret == -1){
2125
perror_plus("close");
2126
}
2127
errno = old_errno;
2128
return EINTR;
2129
}
2130
2131
if(debug){
2132
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2133
interface);
2134
}
2135
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
}
2142
2143
#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
}
2155
}
2156
#endif /* __linux__ */
2157
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2158
ioctl_errno = errno;
2159
#ifdef __linux__
2160
if(restore_loglevel){
2161
ret_linux = klogctl(7, NULL, 0);
2162
if(ret_linux == -1){
2163
perror_plus("klogctl");
2164
}
2165
}
2166
#endif /* __linux__ */
2167
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
}
2177
2178
/* Close the socket */
2179
ret = close(sd);
2180
if(ret == -1){
2181
perror_plus("close");
2182
}
2183
2184
if(ret_setflags == -1){
2185
errno = ioctl_errno;
2186
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2187
errno = old_errno;
2188
return ioctl_errno;
2189
}
2190
} else if(debug){
2191
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2192
interface);
2193
}
2194
2195
/* Sleep checking until interface is running.
2196
Check every 0.25s, up to total time of delay */
2197
for(int i=0; i < delay * 4; i++){
2198
if(interface_is_running(interface)){
2199
break;
2200
}
2201
struct timespec sleeptime = { .tv_nsec = 250000000 };
2202
ret = nanosleep(&sleeptime, NULL);
2203
if(ret == -1 and errno != EINTR){
2204
perror_plus("nanosleep");
2205
}
2206
}
2207
2208
errno = old_errno;
2209
return 0;
2210
}
2211
2212
__attribute__((nonnull, warn_unused_result))
2213
int take_down_interface(const char *const interface){
2214
int old_errno = errno;
2215
struct ifreq network;
2216
unsigned int if_index = if_nametoindex(interface);
2217
if(if_index == 0){
2218
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2219
errno = old_errno;
2220
return ENXIO;
2221
}
2222
if(interface_is_up(interface)){
2223
int ret_errno = 0;
2224
int ioctl_errno = 0;
2225
if(not get_flags(interface, &network) and debug){
2226
ret_errno = errno;
2227
fprintf_plus(stderr, "Failed to get flags for interface "
2228
"\"%s\"\n", interface);
2229
errno = old_errno;
2230
return ret_errno;
2231
}
2232
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2233
2234
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2235
if(sd == -1){
2236
ret_errno = errno;
2237
perror_plus("socket");
2238
errno = old_errno;
2239
return ret_errno;
2240
}
2241
2242
if(debug){
2243
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2244
interface);
2245
}
2246
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
}
2266
2267
/* Close the socket */
2268
int ret = close(sd);
2269
if(ret == -1){
2270
perror_plus("close");
2271
}
2272
2273
if(ret_setflags == -1){
2274
errno = ioctl_errno;
2275
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2276
errno = old_errno;
2277
return ioctl_errno;
2278
}
2279
} else if(debug){
2280
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2281
interface);
2282
}
2283
2284
errno = old_errno;
2285
return 0;
1524
2286
}
1525
2287
1526
2288
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 };
1527
2294
AvahiSServiceBrowser *sb = NULL;
1528
int error;
2295
error_t ret_errno;
1529
2296
int ret;
1530
2297
intmax_t tmpmax;
1531
2298
char *tmp;
1532
2299
int exitcode = EXIT_SUCCESS;
1533
const char *interface = "";
1534
struct ifreq network;
1535
int sd = -1;
1536
bool take_down_interface = false;
1537
uid_t uid;
1538
gid_t gid;
1539
char tempdir[] = "/tmp/mandosXXXXXX";
1540
bool tempdir_created = false;
2300
char *interfaces_to_take_down = NULL;
2301
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;
1541
2305
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1542
2306
const char *seckey = PATHDIR "/" SECKEY;
1543
2307
const char *pubkey = PATHDIR "/" PUBKEY;
2308
const char *dh_params_file = NULL;
2309
char *interfaces_hooks = NULL;
1544
2310
1545
2311
bool gnutls_initialized = false;
1546
2312
bool gpgme_initialized = false;
1598
2364
.doc = "Bit length of the prime number used in the"
1599
2365
" Diffie-Hellman key exchange",
1600
2366
.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 },
1601
2372
{ .name = "priority", .key = 130,
1602
2373
.arg = "STRING",
1603
2374
.doc = "GnuTLS priority string for the TLS handshake",
1637
2408
connect_to = arg;
1638
2409
break;
1639
2410
case 'i': /* --interface */
1640
interface = arg;
2411
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2412
arg, (int)',');
2413
if(ret_errno != 0){
2414
argp_error(state, "%s", strerror(ret_errno));
2415
}
1641
2416
break;
1642
2417
case 's': /* --seckey */
1643
2418
seckey = arg;
1654
2429
}
1655
2430
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1656
2431
break;
2432
case 134: /* --dh-params */
2433
dh_params_file = arg;
2434
break;
1657
2435
case 130: /* --priority */
1658
2436
mc.priority = arg;
1659
2437
break;
1699
2477
.args_doc = "",
1700
2478
.doc = "Mandos client -- Get and decrypt"
1701
2479
" passwords from a Mandos server" };
1702
ret = argp_parse(&argp, argc, argv,
1703
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1704
switch(ret){
2480
ret_errno = argp_parse(&argp, argc, argv,
2481
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2482
switch(ret_errno){
1705
2483
case 0:
1706
2484
break;
1707
2485
case ENOMEM:
1708
2486
default:
1709
errno = ret;
2487
errno = ret_errno;
1710
2488
perror_plus("argp_parse");
1711
2489
exitcode = EX_OSERR;
1712
2490
goto end;
1715
2493
goto end;
1716
2494
}
1717
2495
}
1718
2496
1719
2497
{
1720
2498
/* Work around Debian bug #633582:
1721
<http://bugs.debian.org/633582> */
2499
<https://bugs.debian.org/633582> */
1722
2500
1723
/* Re-raise priviliges */
1724
errno = 0;
1725
ret = seteuid(0);
1726
if(ret == -1){
1727
perror_plus("seteuid");
2501
/* Re-raise privileges */
2502
ret = raise_privileges();
2503
if(ret != 0){
2504
errno = ret;
2505
perror_plus("Failed to raise privileges");
1728
2506
} else {
1729
2507
struct stat st;
1730
2508
1745
2523
}
1746
2524
}
1747
2525
}
1748
TEMP_FAILURE_RETRY(close(seckey_fd));
2526
close(seckey_fd);
1749
2527
}
1750
2528
}
1751
2529
1752
2530
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1753
2531
int pubkey_fd = open(pubkey, O_RDONLY);
1754
2532
if(pubkey_fd == -1){
1766
2544
}
1767
2545
}
1768
2546
}
1769
TEMP_FAILURE_RETRY(close(pubkey_fd));
1770
}
1771
}
1772
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
1773
2573
/* Lower privileges */
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
2574
ret = lower_privileges();
2575
if(ret != 0){
2576
errno = ret;
2577
perror_plus("Failed to lower privileges");
2578
}
2579
}
2580
}
2581
2582
/* Remove invalid interface names (except "none") */
2583
{
2584
char *interface = NULL;
2585
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2586
interface))){
2587
if(strcmp(interface, "none") != 0
2588
and if_nametoindex(interface) == 0){
2589
if(interface[0] != '\0'){
2590
fprintf_plus(stderr, "Not using nonexisting interface"
2591
" \"%s\"\n", interface);
2592
}
2593
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2594
interface = NULL;
1778
2595
}
1779
2596
}
1780
2597
}
1781
2598
1782
2599
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
2600
{
2601
if(mc.interfaces != NULL){
2602
interfaces_hooks = malloc(mc.interfaces_size);
2603
if(interfaces_hooks == NULL){
2604
perror_plus("malloc");
2605
goto end;
2606
}
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);
1785
2612
}
1786
2613
1787
2614
if(not debug){
1788
2615
avahi_set_log_function(empty_log);
1789
2616
}
1790
2617
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1802
if(ret >= 1){
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1805
if(debug){
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1807
}
1808
if(interface == NULL){
1809
perror_plus("malloc");
1810
free(direntries);
1811
exitcode = EXIT_FAILURE;
1812
goto end;
1813
}
1814
free(direntries);
1815
} else {
1816
free(direntries);
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1818
exitcode = EXIT_FAILURE;
1819
goto end;
1820
}
1821
}
1822
1823
2618
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1824
2619
from the signal handler */
1825
2620
/* Initialize the pseudo-RNG for Avahi */
1826
2621
srand((unsigned int) time(NULL));
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
2622
simple_poll = avahi_simple_poll_new();
2623
if(simple_poll == NULL){
1829
2624
fprintf_plus(stderr,
1830
2625
"Avahi: Failed to create simple poll object.\n");
1831
2626
exitcode = EX_UNAVAILABLE;
1895
2690
}
1896
2691
}
1897
2692
1898
/* If the interface is down, bring it up */
1899
if(strcmp(interface, "none") != 0){
1900
if_index = (AvahiIfIndex) if_nametoindex(interface);
1901
if(if_index == 0){
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1903
exitcode = EX_UNAVAILABLE;
1904
goto end;
1905
}
1906
1907
if(quit_now){
1908
goto end;
1909
}
1910
1911
/* Re-raise priviliges */
1912
errno = 0;
1913
ret = seteuid(0);
1914
if(ret == -1){
1915
perror_plus("seteuid");
1916
}
1917
1918
#ifdef __linux__
1919
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1920
messages about the network interface to mess up the prompt */
1921
ret = klogctl(8, NULL, 5);
1922
bool restore_loglevel = true;
1923
if(ret == -1){
1924
restore_loglevel = false;
1925
perror_plus("klogctl");
1926
}
1927
#endif /* __linux__ */
1928
1929
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1930
if(sd < 0){
1931
perror_plus("socket");
1932
exitcode = EX_OSERR;
1933
#ifdef __linux__
1934
if(restore_loglevel){
1935
ret = klogctl(7, NULL, 0);
1936
if(ret == -1){
1937
perror_plus("klogctl");
1938
}
1939
}
1940
#endif /* __linux__ */
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
goto end;
1948
}
1949
strcpy(network.ifr_name, interface);
1950
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1951
if(ret == -1){
1952
perror_plus("ioctl SIOCGIFFLAGS");
1953
#ifdef __linux__
1954
if(restore_loglevel){
1955
ret = klogctl(7, NULL, 0);
1956
if(ret == -1){
1957
perror_plus("klogctl");
1958
}
1959
}
1960
#endif /* __linux__ */
1961
exitcode = EX_OSERR;
1962
/* Lower privileges */
1963
errno = 0;
1964
ret = seteuid(uid);
1965
if(ret == -1){
1966
perror_plus("seteuid");
1967
}
1968
goto end;
1969
}
1970
if((network.ifr_flags & IFF_UP) == 0){
1971
network.ifr_flags |= IFF_UP;
1972
take_down_interface = true;
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
take_down_interface = false;
1976
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1977
exitcode = EX_OSERR;
1978
#ifdef __linux__
1979
if(restore_loglevel){
1980
ret = klogctl(7, NULL, 0);
1981
if(ret == -1){
1982
perror_plus("klogctl");
2693
/* If no interfaces were specified, make a list */
2694
if(mc.interfaces == NULL){
2695
struct dirent **direntries = NULL;
2696
/* Look for any good interfaces */
2697
ret = scandir(sys_class_net, &direntries, good_interface,
2698
alphasort);
2699
if(ret >= 1){
2700
/* Add all found interfaces to interfaces list */
2701
for(int i = 0; i < ret; ++i){
2702
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2703
direntries[i]->d_name);
2704
if(ret_errno != 0){
2705
errno = ret_errno;
2706
perror_plus("argz_add");
2707
free(direntries[i]);
2708
continue;
2709
}
2710
if(debug){
2711
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2712
direntries[i]->d_name);
2713
}
2714
free(direntries[i]);
2715
}
2716
free(direntries);
2717
} else {
2718
if(ret == 0){
2719
free(direntries);
2720
}
2721
fprintf_plus(stderr, "Could not find a network interface\n");
2722
exitcode = EXIT_FAILURE;
2723
goto end;
2724
}
2725
}
2726
2727
/* Bring up interfaces which are down, and remove any "none"s */
2728
{
2729
char *interface = NULL;
2730
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2731
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;
1983
2744
}
1984
2745
}
1985
#endif /* __linux__ */
1986
/* Lower privileges */
1987
errno = 0;
1988
ret = seteuid(uid);
1989
if(ret == -1){
1990
perror_plus("seteuid");
1991
}
1992
goto end;
1993
}
1994
}
1995
/* Sleep checking until interface is running.
1996
Check every 0.25s, up to total time of delay */
1997
for(int i=0; i < delay * 4; i++){
1998
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1999
if(ret == -1){
2000
perror_plus("ioctl SIOCGIFFLAGS");
2001
} else if(network.ifr_flags & IFF_RUNNING){
2002
2746
break;
2003
2747
}
2004
struct timespec sleeptime = { .tv_nsec = 250000000 };
2005
ret = nanosleep(&sleeptime, NULL);
2006
if(ret == -1 and errno != EINTR){
2007
perror_plus("nanosleep");
2008
}
2009
}
2010
if(not take_down_interface){
2011
/* We won't need the socket anymore */
2012
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2013
if(ret == -1){
2014
perror_plus("close");
2015
}
2016
}
2017
#ifdef __linux__
2018
if(restore_loglevel){
2019
/* Restores kernel loglevel to default */
2020
ret = klogctl(7, NULL, 0);
2021
if(ret == -1){
2022
perror_plus("klogctl");
2023
}
2024
}
2025
#endif /* __linux__ */
2026
/* Lower privileges */
2027
errno = 0;
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
2032
}
2748
bool interface_was_up = interface_is_up(interface);
2749
errno = bring_up_interface(interface, delay);
2750
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));
2754
} 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
}
2761
}
2762
}
2763
}
2764
if(debug and (interfaces_to_take_down == NULL)){
2765
fprintf_plus(stderr, "No interfaces were brought up\n");
2766
}
2767
}
2768
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);
2033
2776
}
2034
2777
2035
2778
if(quit_now){
2036
2779
goto end;
2037
2780
}
2038
2781
2039
ret = init_gnutls_global(pubkey, seckey);
2782
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2040
2783
if(ret == -1){
2041
2784
fprintf_plus(stderr, "init_gnutls_global failed\n");
2042
2785
exitcode = EX_UNAVAILABLE;
2049
2792
goto end;
2050
2793
}
2051
2794
2052
if(mkdtemp(tempdir) == NULL){
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){
2053
2805
perror_plus("mkdtemp");
2054
2806
goto end;
2055
2807
}
2056
tempdir_created = true;
2057
2808
2058
2809
if(quit_now){
2059
2810
goto end;
2060
2811
}
2061
2812
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
2813
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2063
2814
fprintf_plus(stderr, "init_gpgme failed\n");
2064
2815
exitcode = EX_UNAVAILABLE;
2065
2816
goto end;
2075
2826
/* Connect directly, do not use Zeroconf */
2076
2827
/* (Mainly meant for debugging) */
2077
2828
char *address = strrchr(connect_to, ':');
2829
2078
2830
if(address == NULL){
2079
2831
fprintf_plus(stderr, "No colon in address\n");
2080
2832
exitcode = EX_USAGE;
2085
2837
goto end;
2086
2838
}
2087
2839
2088
uint16_t port;
2840
in_port_t port;
2089
2841
errno = 0;
2090
2842
tmpmax = strtoimax(address+1, &tmp, 10);
2091
2843
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2092
or tmpmax != (uint16_t)tmpmax){
2844
or tmpmax != (in_port_t)tmpmax){
2093
2845
fprintf_plus(stderr, "Bad port number\n");
2094
2846
exitcode = EX_USAGE;
2095
2847
goto end;
2096
2848
}
2097
2849
2098
2850
if(quit_now){
2099
2851
goto end;
2100
2852
}
2101
2853
2102
port = (uint16_t)tmpmax;
2854
port = (in_port_t)tmpmax;
2103
2855
*address = '\0';
2104
2856
/* Colon in address indicates IPv6 */
2105
2857
int af;
2121
2873
}
2122
2874
2123
2875
while(not quit_now){
2124
ret = start_mandos_communication(address, port, if_index, af);
2876
ret = start_mandos_communication(address, port, if_index, af,
2877
&mc);
2125
2878
if(quit_now or ret == 0){
2126
2879
break;
2127
2880
}
2129
2882
fprintf_plus(stderr, "Retrying in %d seconds\n",
2130
2883
(int)retry_interval);
2131
2884
}
2132
sleep((int)retry_interval);
2885
sleep((unsigned int)retry_interval);
2133
2886
}
2134
2887
2135
if (not quit_now){
2888
if(not quit_now){
2136
2889
exitcode = EXIT_SUCCESS;
2137
2890
}
2138
2891
2153
2906
config.publish_domain = 0;
2154
2907
2155
2908
/* Allocate a new server */
2156
mc.server = avahi_server_new(avahi_simple_poll_get
2157
(mc.simple_poll), &config, NULL,
2158
NULL, &error);
2909
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2910
&config, NULL, NULL, &ret);
2159
2911
2160
2912
/* Free the Avahi configuration data */
2161
2913
avahi_server_config_free(&config);
2164
2916
/* Check if creating the Avahi server object succeeded */
2165
2917
if(mc.server == NULL){
2166
2918
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
2919
avahi_strerror(ret));
2168
2920
exitcode = EX_UNAVAILABLE;
2169
2921
goto end;
2170
2922
}
2176
2928
/* Create the Avahi service browser */
2177
2929
sb = avahi_s_service_browser_new(mc.server, if_index,
2178
2930
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2179
NULL, 0, browse_callback, NULL);
2931
NULL, 0, browse_callback,
2932
(void *)&mc);
2180
2933
if(sb == NULL){
2181
2934
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2182
2935
avahi_strerror(avahi_server_errno(mc.server)));
2193
2946
if(debug){
2194
2947
fprintf_plus(stderr, "Starting Avahi loop search\n");
2195
2948
}
2196
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
2949
2950
ret = avahi_loop_with_timeout(simple_poll,
2951
(int)(retry_interval * 1000), &mc);
2199
2952
if(debug){
2200
2953
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
2954
(ret == 0) ? "successfully" : "with error");
2208
2961
}
2209
2962
2210
2963
/* Cleanup things */
2964
free(mc.interfaces);
2965
2211
2966
if(sb != NULL)
2212
2967
avahi_s_service_browser_free(sb);
2213
2968
2214
2969
if(mc.server != NULL)
2215
2970
avahi_server_free(mc.server);
2216
2971
2217
if(mc.simple_poll != NULL)
2218
avahi_simple_poll_free(mc.simple_poll);
2972
if(simple_poll != NULL)
2973
avahi_simple_poll_free(simple_poll);
2219
2974
2220
2975
if(gnutls_initialized){
2221
2976
gnutls_certificate_free_credentials(mc.cred);
2222
gnutls_global_deinit();
2223
2977
gnutls_dh_params_deinit(mc.dh_params);
2224
2978
}
2225
2979
2233
2987
mc.current_server->prev->next = NULL;
2234
2988
while(mc.current_server != NULL){
2235
2989
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
2236
2998
free(mc.current_server);
2237
2999
mc.current_server = next;
2238
3000
}
2239
3001
}
2240
3002
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2244
/* Re-raise priviliges */
3003
/* Re-raise privileges */
2245
3004
{
2246
errno = 0;
2247
ret = seteuid(0);
2248
if(ret == -1){
2249
perror_plus("seteuid");
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
}
2250
3032
}
2251
3033
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2255
if(ret == -1){
2256
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2260
if(ret == -1){
2261
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2262
}
2263
}
2264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2265
if(ret == -1){
2266
perror_plus("close");
2267
}
3034
ret = lower_privileges_permanently();
3035
if(ret != 0){
3036
errno = ret;
3037
perror_plus("Failed to lower privileges permanently");
2268
3038
}
2269
3039
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
3040
3041
free(interfaces_to_take_down);
3042
free(interfaces_hooks);
3043
3044
void clean_dir_at(int base, const char * const dirname,
3045
uintmax_t level){
3046
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){
3059
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);
2275
3098
}
2276
3099
2277
3100
/* Removes the GPGME temp directory and all files inside */
2278
if(tempdir_created){
2279
struct dirent **direntries = NULL;
2280
struct dirent *direntry = NULL;
2281
int numentries = scandir(tempdir, &direntries, notdotentries,
2282
alphasort);
2283
if (numentries > 0){
2284
for(int i = 0; i < numentries; i++){
2285
direntry = direntries[i];
2286
char *fullname = NULL;
2287
ret = asprintf(&fullname, "%s/%s", tempdir,
2288
direntry->d_name);
2289
if(ret < 0){
2290
perror_plus("asprintf");
2291
continue;
2292
}
2293
ret = remove(fullname);
2294
if(ret == -1){
2295
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2296
strerror(errno));
2297
}
2298
free(fullname);
2299
}
2300
}
2301
2302
/* need to clean even if 0 because man page doesn't specify */
2303
free(direntries);
2304
if (numentries == -1){
2305
perror_plus("scandir");
2306
}
2307
ret = rmdir(tempdir);
2308
if(ret == -1 and errno != ENOENT){
2309
perror_plus("rmdir");
2310
}
3101
if(tempdir != NULL){
3102
clean_dir_at(-1, tempdir, 0);
2311
3103
}
2312
3104
2313
3105
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0