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- Committer: Teddy Hogeborn
- Date: 2017-08-20 14:14:14 UTC
- Revision ID: teddy@recompile.se-20170820141414-m034xuebg7ccaeui
Add some more restrictions to the systemd service file.
* mandos.service ([Service]/ProtectKernelTunables): New; set to "yes".
([Service]/ProtectControlGroups): - '' -
* mandos.service ([Service]/ProtectKernelTunables): New; set to "yes".
([Service]/ProtectControlGroups): - '' -
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 © 2008-2017 Teddy Hogeborn
13
* Copyright © 2008-2017 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() */
43
stdout, ferror() */
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> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy(), strsignal()
51
*/
51
52
#include <sys/ioctl.h> /* ioctl */
52
53
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
54
sockaddr_in6, PF_INET6,
55
56
opendir(), DIR */
56
57
#include <sys/stat.h> /* open(), S_ISREG */
57
58
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
59
inet_pton(), connect(),
60
getnameinfo() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
62
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
63
*/
62
64
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
65
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
66
71
program_invocation_short_name */
67
72
#include <time.h> /* nanosleep(), time(), sleep() */
68
73
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
78
*/
74
79
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
80
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
81
setgid(), pause(), _exit(),
82
unlinkat() */
83
#include <arpa/inet.h> /* inet_pton(), htons() */
78
84
#include <iso646.h> /* not, or, and */
79
85
#include <argp.h> /* struct argp_option, error_t, struct
80
86
argp_state, struct argp,
88
94
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
95
WEXITSTATUS(), WTERMSIG() */
90
96
#include <grp.h> /* setgroups() */
97
#include <argz.h> /* argz_add_sep(), argz_next(),
98
argz_delete(), argz_append(),
99
argz_stringify(), argz_add(),
100
argz_count() */
101
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
102
EAI_SYSTEM, gai_strerror() */
91
103
92
104
#ifdef __linux__
93
105
#include <sys/klog.h> /* klogctl() */
135
147
static const char sys_class_net[] = "/sys/class/net";
136
148
char *connect_to = NULL;
137
149
const char *hookdir = HOOKDIR;
150
int hookdir_fd = -1;
151
uid_t uid = 65534;
152
gid_t gid = 65534;
138
153
139
154
/* Doubly linked list that need to be circularly linked when used */
140
155
typedef struct server{
141
156
const char *ip;
142
uint16_t port;
157
in_port_t port;
143
158
AvahiIfIndex if_index;
144
159
int af;
145
160
struct timespec last_seen;
149
164
150
165
/* Used for passing in values through the Avahi callback functions */
151
166
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
167
AvahiServer *server;
154
168
gnutls_certificate_credentials_t cred;
155
169
unsigned int dh_bits;
157
171
const char *priority;
158
172
gpgme_ctx_t ctx;
159
173
server *current_server;
174
char *interfaces;
175
size_t interfaces_size;
160
176
} mandos_context;
161
177
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 };
178
/* global so signal handler can reach it*/
179
AvahiSimplePoll *simple_poll;
167
180
168
181
sig_atomic_t quit_now = 0;
169
182
int signal_received = 0;
177
190
perror(print_text);
178
191
}
179
192
180
__attribute__((format (gnu_printf, 2, 3)))
193
__attribute__((format (gnu_printf, 2, 3), nonnull))
181
194
int fprintf_plus(FILE *stream, const char *format, ...){
182
195
va_list ap;
183
196
va_start (ap, format);
184
197
185
198
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
199
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
200
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
201
}
189
202
190
203
/*
192
205
* bytes. "buffer_capacity" is how much is currently allocated,
193
206
* "buffer_length" is how much is already used.
194
207
*/
208
__attribute__((nonnull, warn_unused_result))
195
209
size_t incbuffer(char **buffer, size_t buffer_length,
196
210
size_t buffer_capacity){
197
211
if(buffer_length + BUFFER_SIZE > buffer_capacity){
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
212
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
if(new_buf == NULL){
214
int old_errno = errno;
215
free(*buffer);
216
errno = old_errno;
217
*buffer = NULL;
200
218
return 0;
201
219
}
220
*buffer = new_buf;
202
221
buffer_capacity += BUFFER_SIZE;
203
222
}
204
223
return buffer_capacity;
205
224
}
206
225
207
226
/* 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){
227
__attribute__((nonnull, warn_unused_result))
228
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
229
int af, server **current_server){
210
230
int ret;
211
231
server *new_server = malloc(sizeof(server));
212
232
if(new_server == NULL){
219
239
.af = af };
220
240
if(new_server->ip == NULL){
221
241
perror_plus("strdup");
242
free(new_server);
243
return false;
244
}
245
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
246
if(ret == -1){
247
perror_plus("clock_gettime");
248
#ifdef __GNUC__
249
#pragma GCC diagnostic push
250
#pragma GCC diagnostic ignored "-Wcast-qual"
251
#endif
252
free((char *)(new_server->ip));
253
#ifdef __GNUC__
254
#pragma GCC diagnostic pop
255
#endif
256
free(new_server);
222
257
return false;
223
258
}
224
259
/* Special case of first server */
225
if (mc.current_server == NULL){
260
if(*current_server == NULL){
226
261
new_server->next = new_server;
227
262
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
263
*current_server = new_server;
230
264
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
265
/* Place the new server last in the list */
266
new_server->next = *current_server;
267
new_server->prev = (*current_server)->prev;
233
268
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;
269
(*current_server)->prev = new_server;
240
270
}
241
271
return true;
242
272
}
244
274
/*
245
275
* Initialize GPGME.
246
276
*/
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
277
__attribute__((nonnull, warn_unused_result))
278
static bool init_gpgme(const char * const seckey,
279
const char * const pubkey,
280
const char * const tempdir,
281
mandos_context *mc){
249
282
gpgme_error_t rc;
250
283
gpgme_engine_info_t engine_info;
251
284
252
253
285
/*
254
286
* Helper function to insert pub and seckey to the engine keyring.
255
287
*/
256
bool import_key(const char *filename){
288
bool import_key(const char * const filename){
257
289
int ret;
258
290
int fd;
259
291
gpgme_data_t pgp_data;
271
303
return false;
272
304
}
273
305
274
rc = gpgme_op_import(mc.ctx, pgp_data);
306
rc = gpgme_op_import(mc->ctx, pgp_data);
275
307
if(rc != GPG_ERR_NO_ERROR){
276
308
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
309
gpgme_strsource(rc), gpgme_strerror(rc));
278
310
return false;
279
311
}
280
312
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
313
ret = close(fd);
282
314
if(ret == -1){
283
315
perror_plus("close");
284
316
}
321
353
}
322
354
323
355
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
356
rc = gpgme_new(&(mc->ctx));
325
357
if(rc != GPG_ERR_NO_ERROR){
326
358
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
359
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
340
372
* Decrypt OpenPGP data.
341
373
* Returns -1 on error
342
374
*/
375
__attribute__((nonnull, warn_unused_result))
343
376
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
377
size_t crypto_size,
345
char **plaintext){
378
char **plaintext,
379
mandos_context *mc){
346
380
gpgme_data_t dh_crypto, dh_plain;
347
381
gpgme_error_t rc;
348
382
ssize_t ret;
374
408
375
409
/* Decrypt data from the cryptotext data buffer to the plaintext
376
410
data buffer */
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
411
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
378
412
if(rc != GPG_ERR_NO_ERROR){
379
413
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
414
gpgme_strsource(rc), gpgme_strerror(rc));
381
415
plaintext_length = -1;
382
416
if(debug){
383
417
gpgme_decrypt_result_t result;
384
result = gpgme_op_decrypt_result(mc.ctx);
418
result = gpgme_op_decrypt_result(mc->ctx);
385
419
if(result == NULL){
386
420
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
387
421
} else {
464
498
return plaintext_length;
465
499
}
466
500
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;
501
__attribute__((warn_unused_result, const))
502
static const char *safe_string(const char *str){
503
if(str == NULL)
504
return "(unknown)";
505
return str;
506
}
507
508
__attribute__((warn_unused_result))
509
static const char *safer_gnutls_strerror(int value){
510
const char *ret = gnutls_strerror(value);
511
return safe_string(ret);
473
512
}
474
513
475
514
/* GnuTLS log function callback */
515
__attribute__((nonnull))
476
516
static void debuggnutls(__attribute__((unused)) int level,
477
517
const char* string){
478
518
fprintf_plus(stderr, "GnuTLS: %s", string);
479
519
}
480
520
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
481
522
static int init_gnutls_global(const char *pubkeyfilename,
482
const char *seckeyfilename){
523
const char *seckeyfilename,
524
const char *dhparamsfilename,
525
mandos_context *mc){
483
526
int ret;
527
unsigned int uret;
484
528
485
529
if(debug){
486
530
fprintf_plus(stderr, "Initializing GnuTLS\n");
487
531
}
488
532
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
533
if(debug){
497
534
/* "Use a log level over 10 to enable all debugging options."
498
535
* - GnuTLS manual
502
539
}
503
540
504
541
/* OpenPGP credentials */
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
542
ret = gnutls_certificate_allocate_credentials(&mc->cred);
506
543
if(ret != GNUTLS_E_SUCCESS){
507
544
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
545
safer_gnutls_strerror(ret));
509
gnutls_global_deinit();
510
546
return -1;
511
547
}
512
548
518
554
}
519
555
520
556
ret = gnutls_certificate_set_openpgp_key_file
521
(mc.cred, pubkeyfilename, seckeyfilename,
557
(mc->cred, pubkeyfilename, seckeyfilename,
522
558
GNUTLS_OPENPGP_FMT_BASE64);
523
559
if(ret != GNUTLS_E_SUCCESS){
524
560
fprintf_plus(stderr,
530
566
}
531
567
532
568
/* GnuTLS server initialization */
533
ret = gnutls_dh_params_init(&mc.dh_params);
569
ret = gnutls_dh_params_init(&mc->dh_params);
534
570
if(ret != GNUTLS_E_SUCCESS){
535
571
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
572
" initialization: %s\n",
537
573
safer_gnutls_strerror(ret));
538
574
goto globalfail;
539
575
}
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);
576
/* If a Diffie-Hellman parameters file was given, try to use it */
577
if(dhparamsfilename != NULL){
578
gnutls_datum_t params = { .data = NULL, .size = 0 };
579
do {
580
int dhpfile = open(dhparamsfilename, O_RDONLY);
581
if(dhpfile == -1){
582
perror_plus("open");
583
dhparamsfilename = NULL;
584
break;
585
}
586
size_t params_capacity = 0;
587
while(true){
588
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params.size,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
592
perror_plus("incbuffer");
593
free(params.data);
594
params.data = NULL;
595
dhparamsfilename = NULL;
596
break;
597
}
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
600
BUFFER_SIZE);
601
/* EOF */
602
if(bytes_read == 0){
603
break;
604
}
605
/* check bytes_read for failure */
606
if(bytes_read < 0){
607
perror_plus("read");
608
free(params.data);
609
params.data = NULL;
610
dhparamsfilename = NULL;
611
break;
612
}
613
params.size += (unsigned int)bytes_read;
614
}
615
if(params.data == NULL){
616
dhparamsfilename = NULL;
617
}
618
if(dhparamsfilename == NULL){
619
break;
620
}
621
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
622
GNUTLS_X509_FMT_PEM);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Failed to parse DH parameters in file"
625
" \"%s\": %s\n", dhparamsfilename,
626
safer_gnutls_strerror(ret));
627
dhparamsfilename = NULL;
628
}
629
free(params.data);
630
} while(false);
631
}
632
if(dhparamsfilename == NULL){
633
if(mc->dh_bits == 0){
634
/* Find out the optimal number of DH bits */
635
/* Try to read the private key file */
636
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
637
do {
638
int secfile = open(seckeyfilename, O_RDONLY);
639
if(secfile == -1){
640
perror_plus("open");
641
break;
642
}
643
size_t buffer_capacity = 0;
644
while(true){
645
buffer_capacity = incbuffer((char **)&buffer.data,
646
(size_t)buffer.size,
647
(size_t)buffer_capacity);
648
if(buffer_capacity == 0){
649
perror_plus("incbuffer");
650
free(buffer.data);
651
buffer.data = NULL;
652
break;
653
}
654
ssize_t bytes_read = read(secfile,
655
buffer.data + buffer.size,
656
BUFFER_SIZE);
657
/* EOF */
658
if(bytes_read == 0){
659
break;
660
}
661
/* check bytes_read for failure */
662
if(bytes_read < 0){
663
perror_plus("read");
664
free(buffer.data);
665
buffer.data = NULL;
666
break;
667
}
668
buffer.size += (unsigned int)bytes_read;
669
}
670
close(secfile);
671
} while(false);
672
/* If successful, use buffer to parse private key */
673
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
674
if(buffer.data != NULL){
675
{
676
gnutls_openpgp_privkey_t privkey = NULL;
677
ret = gnutls_openpgp_privkey_init(&privkey);
678
if(ret != GNUTLS_E_SUCCESS){
679
fprintf_plus(stderr, "Error initializing OpenPGP key"
680
" structure: %s",
681
safer_gnutls_strerror(ret));
682
free(buffer.data);
683
buffer.data = NULL;
684
} else {
685
ret = gnutls_openpgp_privkey_import
686
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
687
if(ret != GNUTLS_E_SUCCESS){
688
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
689
safer_gnutls_strerror(ret));
690
privkey = NULL;
691
}
692
free(buffer.data);
693
buffer.data = NULL;
694
if(privkey != NULL){
695
/* Use private key to suggest an appropriate
696
sec_param */
697
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
698
gnutls_openpgp_privkey_deinit(privkey);
699
if(debug){
700
fprintf_plus(stderr, "This OpenPGP key implies using"
701
" a GnuTLS security parameter \"%s\".\n",
702
safe_string(gnutls_sec_param_get_name
703
(sec_param)));
704
}
705
}
706
}
707
}
708
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
709
/* Err on the side of caution */
710
sec_param = GNUTLS_SEC_PARAM_ULTRA;
711
if(debug){
712
fprintf_plus(stderr, "Falling back to security parameter"
713
" \"%s\"\n",
714
safe_string(gnutls_sec_param_get_name
715
(sec_param)));
716
}
717
}
718
}
719
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
720
if(uret != 0){
721
mc->dh_bits = uret;
722
if(debug){
723
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
724
" implies %u DH bits; using that.\n",
725
safe_string(gnutls_sec_param_get_name
726
(sec_param)),
727
mc->dh_bits);
728
}
729
} else {
730
fprintf_plus(stderr, "Failed to get implied number of DH"
731
" bits for security parameter \"%s\"): %s\n",
732
safe_string(gnutls_sec_param_get_name
733
(sec_param)),
734
safer_gnutls_strerror(ret));
735
goto globalfail;
736
}
737
} else if(debug){
738
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
739
mc->dh_bits);
740
}
741
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
742
if(ret != GNUTLS_E_SUCCESS){
743
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
744
" bits): %s\n", mc->dh_bits,
745
safer_gnutls_strerror(ret));
746
goto globalfail;
747
}
748
}
749
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
548
750
549
751
return 0;
550
752
551
753
globalfail:
552
754
553
gnutls_certificate_free_credentials(mc.cred);
554
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
755
gnutls_certificate_free_credentials(mc->cred);
756
gnutls_dh_params_deinit(mc->dh_params);
556
757
return -1;
557
758
}
558
759
559
static int init_gnutls_session(gnutls_session_t *session){
760
__attribute__((nonnull, warn_unused_result))
761
static int init_gnutls_session(gnutls_session_t *session,
762
mandos_context *mc){
560
763
int ret;
561
764
/* GnuTLS session creation */
562
765
do {
574
777
{
575
778
const char *err;
576
779
do {
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
780
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
578
781
if(quit_now){
579
782
gnutls_deinit(*session);
580
783
return -1;
591
794
592
795
do {
593
796
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
mc.cred);
797
mc->cred);
595
798
if(quit_now){
596
799
gnutls_deinit(*session);
597
800
return -1;
607
810
/* ignore client certificate if any. */
608
811
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
609
812
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
611
612
813
return 0;
613
814
}
614
815
616
817
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
617
818
__attribute__((unused)) const char *txt){}
618
819
820
/* Set effective uid to 0, return errno */
821
__attribute__((warn_unused_result))
822
int raise_privileges(void){
823
int old_errno = errno;
824
int ret = 0;
825
if(seteuid(0) == -1){
826
ret = errno;
827
}
828
errno = old_errno;
829
return ret;
830
}
831
832
/* Set effective and real user ID to 0. Return errno. */
833
__attribute__((warn_unused_result))
834
int raise_privileges_permanently(void){
835
int old_errno = errno;
836
int ret = raise_privileges();
837
if(ret != 0){
838
errno = old_errno;
839
return ret;
840
}
841
if(setuid(0) == -1){
842
ret = errno;
843
}
844
errno = old_errno;
845
return ret;
846
}
847
848
/* Set effective user ID to unprivileged saved user ID */
849
__attribute__((warn_unused_result))
850
int lower_privileges(void){
851
int old_errno = errno;
852
int ret = 0;
853
if(seteuid(uid) == -1){
854
ret = errno;
855
}
856
errno = old_errno;
857
return ret;
858
}
859
860
/* Lower privileges permanently */
861
__attribute__((warn_unused_result))
862
int lower_privileges_permanently(void){
863
int old_errno = errno;
864
int ret = 0;
865
if(setuid(uid) == -1){
866
ret = errno;
867
}
868
errno = old_errno;
869
return ret;
870
}
871
872
/* Helper function to add_local_route() and delete_local_route() */
873
__attribute__((nonnull, warn_unused_result))
874
static bool add_delete_local_route(const bool add,
875
const char *address,
876
AvahiIfIndex if_index){
877
int ret;
878
char helper[] = "mandos-client-iprouteadddel";
879
char add_arg[] = "add";
880
char delete_arg[] = "delete";
881
char debug_flag[] = "--debug";
882
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
883
if(pluginhelperdir == NULL){
884
if(debug){
885
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
886
" variable not set; cannot run helper\n");
887
}
888
return false;
889
}
890
891
char interface[IF_NAMESIZE];
892
if(if_indextoname((unsigned int)if_index, interface) == NULL){
893
perror_plus("if_indextoname");
894
return false;
895
}
896
897
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
898
if(devnull == -1){
899
perror_plus("open(\"/dev/null\", O_RDONLY)");
900
return false;
901
}
902
pid_t pid = fork();
903
if(pid == 0){
904
/* Child */
905
/* Raise privileges */
906
errno = raise_privileges_permanently();
907
if(errno != 0){
908
perror_plus("Failed to raise privileges");
909
/* _exit(EX_NOPERM); */
910
} else {
911
/* Set group */
912
errno = 0;
913
ret = setgid(0);
914
if(ret == -1){
915
perror_plus("setgid");
916
_exit(EX_NOPERM);
917
}
918
/* Reset supplementary groups */
919
errno = 0;
920
ret = setgroups(0, NULL);
921
if(ret == -1){
922
perror_plus("setgroups");
923
_exit(EX_NOPERM);
924
}
925
}
926
ret = dup2(devnull, STDIN_FILENO);
927
if(ret == -1){
928
perror_plus("dup2(devnull, STDIN_FILENO)");
929
_exit(EX_OSERR);
930
}
931
ret = close(devnull);
932
if(ret == -1){
933
perror_plus("close");
934
_exit(EX_OSERR);
935
}
936
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
937
if(ret == -1){
938
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
939
_exit(EX_OSERR);
940
}
941
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
942
O_RDONLY
943
| O_DIRECTORY
944
| O_PATH
945
| O_CLOEXEC));
946
if(helperdir_fd == -1){
947
perror_plus("open");
948
_exit(EX_UNAVAILABLE);
949
}
950
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
951
helper, O_RDONLY));
952
if(helper_fd == -1){
953
perror_plus("openat");
954
close(helperdir_fd);
955
_exit(EX_UNAVAILABLE);
956
}
957
close(helperdir_fd);
958
#ifdef __GNUC__
959
#pragma GCC diagnostic push
960
#pragma GCC diagnostic ignored "-Wcast-qual"
961
#endif
962
if(fexecve(helper_fd, (char *const [])
963
{ helper, add ? add_arg : delete_arg, (char *)address,
964
interface, debug ? debug_flag : NULL, NULL },
965
environ) == -1){
966
#ifdef __GNUC__
967
#pragma GCC diagnostic pop
968
#endif
969
perror_plus("fexecve");
970
_exit(EXIT_FAILURE);
971
}
972
}
973
if(pid == -1){
974
perror_plus("fork");
975
return false;
976
}
977
int status;
978
pid_t pret = -1;
979
errno = 0;
980
do {
981
pret = waitpid(pid, &status, 0);
982
if(pret == -1 and errno == EINTR and quit_now){
983
int errno_raising = 0;
984
if((errno = raise_privileges()) != 0){
985
errno_raising = errno;
986
perror_plus("Failed to raise privileges in order to"
987
" kill helper program");
988
}
989
if(kill(pid, SIGTERM) == -1){
990
perror_plus("kill");
991
}
992
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
993
perror_plus("Failed to lower privileges after killing"
994
" helper program");
995
}
996
return false;
997
}
998
} while(pret == -1 and errno == EINTR);
999
if(pret == -1){
1000
perror_plus("waitpid");
1001
return false;
1002
}
1003
if(WIFEXITED(status)){
1004
if(WEXITSTATUS(status) != 0){
1005
fprintf_plus(stderr, "Error: iprouteadddel exited"
1006
" with status %d\n", WEXITSTATUS(status));
1007
return false;
1008
}
1009
return true;
1010
}
1011
if(WIFSIGNALED(status)){
1012
fprintf_plus(stderr, "Error: iprouteadddel died by"
1013
" signal %d\n", WTERMSIG(status));
1014
return false;
1015
}
1016
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1017
return false;
1018
}
1019
1020
__attribute__((nonnull, warn_unused_result))
1021
static bool add_local_route(const char *address,
1022
AvahiIfIndex if_index){
1023
if(debug){
1024
fprintf_plus(stderr, "Adding route to %s\n", address);
1025
}
1026
return add_delete_local_route(true, address, if_index);
1027
}
1028
1029
__attribute__((nonnull, warn_unused_result))
1030
static bool delete_local_route(const char *address,
1031
AvahiIfIndex if_index){
1032
if(debug){
1033
fprintf_plus(stderr, "Removing route to %s\n", address);
1034
}
1035
return add_delete_local_route(false, address, if_index);
1036
}
1037
619
1038
/* Called when a Mandos server is found */
620
static int start_mandos_communication(const char *ip, uint16_t port,
1039
__attribute__((nonnull, warn_unused_result))
1040
static int start_mandos_communication(const char *ip, in_port_t port,
621
1041
AvahiIfIndex if_index,
622
int af){
1042
int af, mandos_context *mc){
623
1043
int ret, tcp_sd = -1;
624
1044
ssize_t sret;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
1045
struct sockaddr_storage to;
629
1046
char *buffer = NULL;
630
1047
char *decrypted_buffer = NULL;
631
1048
size_t buffer_length = 0;
634
1051
int retval = -1;
635
1052
gnutls_session_t session;
636
1053
int pf; /* Protocol family */
1054
bool route_added = false;
637
1055
638
1056
errno = 0;
639
1057
655
1073
return -1;
656
1074
}
657
1075
658
ret = init_gnutls_session(&session);
1076
/* If the interface is specified and we have a list of interfaces */
1077
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1078
/* Check if the interface is one of the interfaces we are using */
1079
bool match = false;
1080
{
1081
char *interface = NULL;
1082
while((interface = argz_next(mc->interfaces,
1083
mc->interfaces_size,
1084
interface))){
1085
if(if_nametoindex(interface) == (unsigned int)if_index){
1086
match = true;
1087
break;
1088
}
1089
}
1090
}
1091
if(not match){
1092
/* This interface does not match any in the list, so we don't
1093
connect to the server */
1094
if(debug){
1095
char interface[IF_NAMESIZE];
1096
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1097
perror_plus("if_indextoname");
1098
} else {
1099
fprintf_plus(stderr, "Skipping server on non-used interface"
1100
" \"%s\"\n",
1101
if_indextoname((unsigned int)if_index,
1102
interface));
1103
}
1104
}
1105
return -1;
1106
}
1107
}
1108
1109
ret = init_gnutls_session(&session, mc);
659
1110
if(ret != 0){
660
1111
return -1;
661
1112
}
662
1113
663
1114
if(debug){
664
1115
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
1116
PRIuMAX "\n", ip, (uintmax_t)port);
666
1117
}
667
1118
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
1119
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
669
1120
if(tcp_sd < 0){
670
1121
int e = errno;
671
1122
perror_plus("socket");
678
1129
goto mandos_end;
679
1130
}
680
1131
681
memset(&to, 0, sizeof(to));
682
1132
if(af == AF_INET6){
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1133
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1134
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1135
ret = inet_pton(af, ip, &to6->sin6_addr);
685
1136
} else { /* IPv4 */
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
1137
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1138
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1139
ret = inet_pton(af, ip, &to4->sin_addr);
688
1140
}
689
1141
if(ret < 0 ){
690
1142
int e = errno;
699
1151
goto mandos_end;
700
1152
}
701
1153
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*/
1154
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1155
if(IN6_IS_ADDR_LINKLOCAL
1156
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
709
1157
if(if_index == AVAHI_IF_UNSPEC){
710
1158
fprintf_plus(stderr, "An IPv6 link-local address is"
711
1159
" incomplete without a network interface\n");
713
1161
goto mandos_end;
714
1162
}
715
1163
/* Set the network interface number as scope */
716
to.in6.sin6_scope_id = (uint32_t)if_index;
1164
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
717
1165
}
718
1166
} else {
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
1167
((struct sockaddr_in *)&to)->sin_port = htons(port);
722
1168
}
723
1169
724
1170
if(quit_now){
732
1178
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
1179
perror_plus("if_indextoname");
734
1180
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
1181
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1182
"\n", ip, interface, (uintmax_t)port);
737
1183
}
738
1184
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
1185
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1186
ip, (uintmax_t)port);
741
1187
}
742
1188
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
1189
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;
1190
if(af == AF_INET6){
1191
ret = getnameinfo((struct sockaddr *)&to,
1192
sizeof(struct sockaddr_in6),
1193
addrstr, sizeof(addrstr), NULL, 0,
1194
NI_NUMERICHOST);
1195
} else {
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in),
1198
addrstr, sizeof(addrstr), NULL, 0,
1199
NI_NUMERICHOST);
1200
}
1201
if(ret == EAI_SYSTEM){
1202
perror_plus("getnameinfo");
1203
} else if(ret != 0) {
1204
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1205
} else if(strcmp(addrstr, ip) != 0){
1206
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1207
}
1208
}
1209
1210
if(quit_now){
1211
errno = EINTR;
1212
goto mandos_end;
1213
}
1214
1215
while(true){
1216
if(af == AF_INET6){
1217
ret = connect(tcp_sd, (struct sockaddr *)&to,
1218
sizeof(struct sockaddr_in6));
1219
} else {
1220
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1221
sizeof(struct sockaddr_in));
1222
}
1223
if(ret < 0){
1224
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1225
and if_index != AVAHI_IF_UNSPEC
1226
and connect_to == NULL
1227
and not route_added and
1228
((af == AF_INET6 and not
1229
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1230
&to)->sin6_addr)))
1231
or (af == AF_INET and
1232
/* Not a a IPv4LL address */
1233
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1234
& 0xFFFF0000L) != 0xA9FE0000L))){
1235
/* Work around Avahi bug - Avahi does not announce link-local
1236
addresses if it has a global address, so local hosts with
1237
*only* a link-local address (e.g. Mandos clients) cannot
1238
connect to a Mandos server announced by Avahi on a server
1239
host with a global address. Work around this by retrying
1240
with an explicit route added with the server's address.
1241
1242
Avahi bug reference:
1243
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://bugs.debian.org/587961
1245
*/
1246
if(debug){
1247
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
" direct route\n");
1249
}
1250
int e = errno;
1251
route_added = add_local_route(ip, if_index);
1252
if(route_added){
1253
continue;
1254
}
1255
errno = e;
1256
}
1257
if(errno != ECONNREFUSED or debug){
1258
int e = errno;
1259
perror_plus("connect");
1260
errno = e;
1261
}
1262
goto mandos_end;
1263
}
1264
1265
if(quit_now){
1266
errno = EINTR;
1267
goto mandos_end;
1268
}
1269
break;
783
1270
}
784
1271
785
1272
const char *out = mandos_protocol_version;
936
1423
if(buffer_length > 0){
937
1424
ssize_t decrypted_buffer_size;
938
1425
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
939
&decrypted_buffer);
1426
&decrypted_buffer, mc);
940
1427
if(decrypted_buffer_size >= 0){
941
1428
1429
clearerr(stdout);
942
1430
written = 0;
943
1431
while(written < (size_t) decrypted_buffer_size){
944
1432
if(quit_now){
960
1448
}
961
1449
written += (size_t)ret;
962
1450
}
1451
ret = fflush(stdout);
1452
if(ret != 0){
1453
int e = errno;
1454
if(debug){
1455
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1456
strerror(errno));
1457
}
1458
errno = e;
1459
goto mandos_end;
1460
}
963
1461
retval = 0;
964
1462
}
965
1463
}
968
1466
969
1467
mandos_end:
970
1468
{
1469
if(route_added){
1470
if(not delete_local_route(ip, if_index)){
1471
fprintf_plus(stderr, "Failed to delete local route to %s on"
1472
" interface %d", ip, if_index);
1473
}
1474
}
971
1475
int e = errno;
972
1476
free(decrypted_buffer);
973
1477
free(buffer);
974
1478
if(tcp_sd >= 0){
975
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1479
ret = close(tcp_sd);
976
1480
}
977
1481
if(ret == -1){
978
1482
if(e == 0){
1003
1507
AVAHI_GCC_UNUSED AvahiStringList *txt,
1004
1508
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1005
1509
flags,
1006
AVAHI_GCC_UNUSED void* userdata){
1007
assert(r);
1510
void *mc){
1511
if(r == NULL){
1512
return;
1513
}
1008
1514
1009
1515
/* Called whenever a service has been resolved successfully or
1010
1516
timed out */
1011
1517
1012
1518
if(quit_now){
1519
avahi_s_service_resolver_free(r);
1013
1520
return;
1014
1521
}
1015
1522
1019
1526
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1020
1527
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1021
1528
domain,
1022
avahi_strerror(avahi_server_errno(mc.server)));
1529
avahi_strerror(avahi_server_errno
1530
(((mandos_context*)mc)->server)));
1023
1531
break;
1024
1532
1025
1533
case AVAHI_RESOLVER_FOUND:
1031
1539
PRIdMAX ") on port %" PRIu16 "\n", name,
1032
1540
host_name, ip, (intmax_t)interface, port);
1033
1541
}
1034
int ret = start_mandos_communication(ip, port, interface,
1035
avahi_proto_to_af(proto));
1542
int ret = start_mandos_communication(ip, (in_port_t)port,
1543
interface,
1544
avahi_proto_to_af(proto),
1545
mc);
1036
1546
if(ret == 0){
1037
avahi_simple_poll_quit(mc.simple_poll);
1547
avahi_simple_poll_quit(simple_poll);
1038
1548
} else {
1039
if(not add_server(ip, port, interface,
1040
avahi_proto_to_af(proto))){
1549
if(not add_server(ip, (in_port_t)port, interface,
1550
avahi_proto_to_af(proto),
1551
&((mandos_context*)mc)->current_server)){
1041
1552
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1042
1553
" list\n", name);
1043
1554
}
1056
1567
const char *domain,
1057
1568
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1058
1569
flags,
1059
AVAHI_GCC_UNUSED void* userdata){
1060
assert(b);
1570
void *mc){
1571
if(b == NULL){
1572
return;
1573
}
1061
1574
1062
1575
/* Called whenever a new services becomes available on the LAN or
1063
1576
is removed from the LAN */
1071
1584
case AVAHI_BROWSER_FAILURE:
1072
1585
1073
1586
fprintf_plus(stderr, "(Avahi browser) %s\n",
1074
avahi_strerror(avahi_server_errno(mc.server)));
1075
avahi_simple_poll_quit(mc.simple_poll);
1587
avahi_strerror(avahi_server_errno
1588
(((mandos_context*)mc)->server)));
1589
avahi_simple_poll_quit(simple_poll);
1076
1590
return;
1077
1591
1078
1592
case AVAHI_BROWSER_NEW:
1081
1595
the callback function is called the Avahi server will free the
1082
1596
resolver for us. */
1083
1597
1084
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1085
name, type, domain, protocol, 0,
1086
resolve_callback, NULL) == NULL)
1598
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1599
interface, protocol, name, type,
1600
domain, protocol, 0,
1601
resolve_callback, mc) == NULL)
1087
1602
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1088
1603
" %s\n", name,
1089
avahi_strerror(avahi_server_errno(mc.server)));
1604
avahi_strerror(avahi_server_errno
1605
(((mandos_context*)mc)->server)));
1090
1606
break;
1091
1607
1092
1608
case AVAHI_BROWSER_REMOVE:
1111
1627
signal_received = sig;
1112
1628
int old_errno = errno;
1113
1629
/* set main loop to exit */
1114
if(mc.simple_poll != NULL){
1115
avahi_simple_poll_quit(mc.simple_poll);
1630
if(simple_poll != NULL){
1631
avahi_simple_poll_quit(simple_poll);
1116
1632
}
1117
1633
errno = old_errno;
1118
1634
}
1119
1635
1636
__attribute__((nonnull, warn_unused_result))
1120
1637
bool get_flags(const char *ifname, struct ifreq *ifr){
1121
1638
int ret;
1639
int old_errno;
1122
1640
1123
1641
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1124
1642
if(s < 0){
1643
old_errno = errno;
1125
1644
perror_plus("socket");
1645
errno = old_errno;
1126
1646
return false;
1127
1647
}
1128
strcpy(ifr->ifr_name, ifname);
1648
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1649
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1129
1650
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1130
1651
if(ret == -1){
1131
1652
if(debug){
1653
old_errno = errno;
1132
1654
perror_plus("ioctl SIOCGIFFLAGS");
1655
errno = old_errno;
1133
1656
}
1134
1657
return false;
1135
1658
}
1136
1659
return true;
1137
1660
}
1138
1661
1662
__attribute__((nonnull, warn_unused_result))
1139
1663
bool good_flags(const char *ifname, const struct ifreq *ifr){
1140
1664
1141
1665
/* Reject the loopback device */
1183
1707
* corresponds to an acceptable network device.
1184
1708
* (This function is passed to scandir(3) as a filter function.)
1185
1709
*/
1710
__attribute__((nonnull, warn_unused_result))
1186
1711
int good_interface(const struct dirent *if_entry){
1187
1712
if(if_entry->d_name[0] == '.'){
1188
1713
return 0;
1204
1729
}
1205
1730
1206
1731
/*
1207
* This function determines if a directory entry in /sys/class/net
1208
* corresponds to an acceptable network device which is up.
1209
* (This function is passed to scandir(3) as a filter function.)
1210
*/
1211
int up_interface(const struct dirent *if_entry){
1212
if(if_entry->d_name[0] == '.'){
1213
return 0;
1214
}
1215
1216
struct ifreq ifr;
1217
if(not get_flags(if_entry->d_name, &ifr)){
1218
if(debug){
1219
fprintf_plus(stderr, "Failed to get flags for interface "
1220
"\"%s\"\n", if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject down interfaces */
1226
if(not (ifr.ifr_flags & IFF_UP)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
/* Reject non-running interfaces */
1235
if(not (ifr.ifr_flags & IFF_RUNNING)){
1236
if(debug){
1237
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
if(not good_flags(if_entry->d_name, &ifr)){
1244
return 0;
1245
}
1246
return 1;
1247
}
1248
1732
* This function determines if a network interface is up.
1733
*/
1734
__attribute__((nonnull, warn_unused_result))
1735
bool interface_is_up(const char *interface){
1736
struct ifreq ifr;
1737
if(not get_flags(interface, &ifr)){
1738
if(debug){
1739
fprintf_plus(stderr, "Failed to get flags for interface "
1740
"\"%s\"\n", interface);
1741
}
1742
return false;
1743
}
1744
1745
return (bool)(ifr.ifr_flags & IFF_UP);
1746
}
1747
1748
/*
1749
* This function determines if a network interface is running
1750
*/
1751
__attribute__((nonnull, warn_unused_result))
1752
bool interface_is_running(const char *interface){
1753
struct ifreq ifr;
1754
if(not get_flags(interface, &ifr)){
1755
if(debug){
1756
fprintf_plus(stderr, "Failed to get flags for interface "
1757
"\"%s\"\n", interface);
1758
}
1759
return false;
1760
}
1761
1762
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1763
}
1764
1765
__attribute__((nonnull, pure, warn_unused_result))
1249
1766
int notdotentries(const struct dirent *direntry){
1250
1767
/* Skip "." and ".." */
1251
1768
if(direntry->d_name[0] == '.'
1258
1775
}
1259
1776
1260
1777
/* Is this directory entry a runnable program? */
1778
__attribute__((nonnull, warn_unused_result))
1261
1779
int runnable_hook(const struct dirent *direntry){
1262
1780
int ret;
1263
1781
size_t sret;
1271
1789
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
1790
"abcdefghijklmnopqrstuvwxyz"
1273
1791
"0123456789"
1274
"_-");
1792
"_.-");
1275
1793
if((direntry->d_name)[sret] != '\0'){
1276
1794
/* Contains non-allowed characters */
1277
1795
if(debug){
1281
1799
return 0;
1282
1800
}
1283
1801
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);
1802
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1292
1803
if(ret == -1){
1293
1804
if(debug){
1294
1805
perror_plus("Could not stat hook");
1318
1829
return 1;
1319
1830
}
1320
1831
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1832
__attribute__((nonnull, warn_unused_result))
1833
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1834
mandos_context *mc){
1322
1835
int ret;
1323
1836
struct timespec now;
1324
1837
struct timespec waited_time;
1325
1838
intmax_t block_time;
1326
1839
1327
1840
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1841
if(mc->current_server == NULL){
1842
if(debug){
1330
1843
fprintf_plus(stderr, "Wait until first server is found."
1331
1844
" No timeout!\n");
1332
1845
}
1333
1846
ret = avahi_simple_poll_iterate(s, -1);
1334
1847
} else {
1335
if (debug){
1848
if(debug){
1336
1849
fprintf_plus(stderr, "Check current_server if we should run"
1337
1850
" it, or wait\n");
1338
1851
}
1345
1858
/* Calculating in ms how long time between now and server
1346
1859
who we visted longest time ago. Now - last seen. */
1347
1860
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1861
- mc->current_server->last_seen.tv_sec);
1349
1862
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1863
- mc->current_server->last_seen.tv_nsec);
1351
1864
/* total time is 10s/10,000ms.
1352
1865
Converting to s from ms by dividing by 1,000,
1353
1866
and ns to ms by dividing by 1,000,000. */
1355
1868
- ((intmax_t)waited_time.tv_sec * 1000))
1356
1869
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1870
1358
if (debug){
1871
if(debug){
1359
1872
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
1873
block_time);
1361
1874
}
1362
1875
1363
1876
if(block_time <= 0){
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);
1877
ret = start_mandos_communication(mc->current_server->ip,
1878
mc->current_server->port,
1879
mc->current_server->if_index,
1880
mc->current_server->af, mc);
1368
1881
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1882
avahi_simple_poll_quit(s);
1370
1883
return 0;
1371
1884
}
1372
1885
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1886
&mc->current_server->last_seen);
1374
1887
if(ret == -1){
1375
1888
perror_plus("clock_gettime");
1376
1889
return -1;
1377
1890
}
1378
mc.current_server = mc.current_server->next;
1891
mc->current_server = mc->current_server->next;
1379
1892
block_time = 0; /* Call avahi to find new Mandos
1380
1893
servers, but don't block */
1381
1894
}
1383
1896
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
1897
}
1385
1898
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1899
if(ret > 0 or errno != EINTR){
1387
1900
return (ret != 1) ? ret : 0;
1388
1901
}
1389
1902
}
1390
1903
}
1391
1904
}
1392
1905
1393
bool run_network_hooks(const char *mode, const char *interface,
1906
__attribute__((nonnull))
1907
void run_network_hooks(const char *mode, const char *interface,
1394
1908
const float delay){
1395
struct dirent **direntries;
1396
struct dirent *direntry;
1397
int ret;
1398
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1399
alphasort);
1909
struct dirent **direntries = NULL;
1910
if(hookdir_fd == -1){
1911
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1912
| O_CLOEXEC);
1913
if(hookdir_fd == -1){
1914
if(errno == ENOENT){
1915
if(debug){
1916
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1917
" found\n", hookdir);
1918
}
1919
} else {
1920
perror_plus("open");
1921
}
1922
return;
1923
}
1924
}
1925
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1926
runnable_hook, alphasort);
1400
1927
if(numhooks == -1){
1401
1928
perror_plus("scandir");
1402
} else {
1403
int devnull = open("/dev/null", O_RDONLY);
1404
for(int i = 0; i < numhooks; i++){
1405
direntry = direntries[i];
1406
char *fullname = NULL;
1407
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1408
if(ret < 0){
1929
return;
1930
}
1931
struct dirent *direntry;
1932
int ret;
1933
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1934
if(devnull == -1){
1935
perror_plus("open(\"/dev/null\", O_RDONLY)");
1936
return;
1937
}
1938
for(int i = 0; i < numhooks; i++){
1939
direntry = direntries[i];
1940
if(debug){
1941
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1942
direntry->d_name);
1943
}
1944
pid_t hook_pid = fork();
1945
if(hook_pid == 0){
1946
/* Child */
1947
/* Raise privileges */
1948
errno = raise_privileges_permanently();
1949
if(errno != 0){
1950
perror_plus("Failed to raise privileges");
1951
_exit(EX_NOPERM);
1952
}
1953
/* Set group */
1954
errno = 0;
1955
ret = setgid(0);
1956
if(ret == -1){
1957
perror_plus("setgid");
1958
_exit(EX_NOPERM);
1959
}
1960
/* Reset supplementary groups */
1961
errno = 0;
1962
ret = setgroups(0, NULL);
1963
if(ret == -1){
1964
perror_plus("setgroups");
1965
_exit(EX_NOPERM);
1966
}
1967
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1968
if(ret == -1){
1969
perror_plus("setenv");
1970
_exit(EX_OSERR);
1971
}
1972
ret = setenv("DEVICE", interface, 1);
1973
if(ret == -1){
1974
perror_plus("setenv");
1975
_exit(EX_OSERR);
1976
}
1977
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1978
if(ret == -1){
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
ret = setenv("MODE", mode, 1);
1983
if(ret == -1){
1984
perror_plus("setenv");
1985
_exit(EX_OSERR);
1986
}
1987
char *delaystring;
1988
ret = asprintf(&delaystring, "%f", (double)delay);
1989
if(ret == -1){
1409
1990
perror_plus("asprintf");
1410
continue;
1411
}
1412
if(debug){
1413
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1414
direntry->d_name);
1415
}
1416
pid_t hook_pid = fork();
1417
if(hook_pid == 0){
1418
/* Child */
1419
/* Raise privileges */
1420
errno = 0;
1421
ret = seteuid(0);
1422
if(ret == -1){
1423
perror_plus("seteuid");
1424
}
1425
/* Raise privileges even more */
1426
errno = 0;
1427
ret = setuid(0);
1428
if(ret == -1){
1429
perror_plus("setuid");
1430
}
1431
/* Set group */
1432
errno = 0;
1433
ret = setgid(0);
1434
if(ret == -1){
1435
perror_plus("setgid");
1436
}
1437
/* Reset supplementary groups */
1438
errno = 0;
1439
ret = setgroups(0, NULL);
1440
if(ret == -1){
1441
perror_plus("setgroups");
1442
}
1443
dup2(devnull, STDIN_FILENO);
1444
close(devnull);
1445
dup2(STDERR_FILENO, STDOUT_FILENO);
1446
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("DEVICE", interface, 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
ret = setenv("MODE", mode, 1);
1462
if(ret == -1){
1463
perror_plus("setenv");
1464
_exit(EX_OSERR);
1465
}
1466
char *delaystring;
1467
ret = asprintf(&delaystring, "%f", delay);
1468
if(ret == -1){
1469
perror_plus("asprintf");
1470
_exit(EX_OSERR);
1471
}
1472
ret = setenv("DELAY", delaystring, 1);
1473
if(ret == -1){
1474
free(delaystring);
1475
perror_plus("setenv");
1476
_exit(EX_OSERR);
1477
}
1991
_exit(EX_OSERR);
1992
}
1993
ret = setenv("DELAY", delaystring, 1);
1994
if(ret == -1){
1478
1995
free(delaystring);
1479
if(connect_to != NULL){
1480
ret = setenv("CONNECT", connect_to, 1);
1481
if(ret == -1){
1482
perror_plus("setenv");
1483
_exit(EX_OSERR);
1484
}
1485
}
1486
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1487
perror_plus("execl");
1488
_exit(EXIT_FAILURE);
1489
}
1490
} else {
1491
int status;
1492
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1493
perror_plus("waitpid");
1494
free(fullname);
1495
continue;
1496
}
1497
if(WIFEXITED(status)){
1498
if(WEXITSTATUS(status) != 0){
1499
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1500
" with status %d\n", direntry->d_name,
1501
WEXITSTATUS(status));
1502
free(fullname);
1503
continue;
1504
}
1505
} else if(WIFSIGNALED(status)){
1506
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1507
" signal %d\n", direntry->d_name,
1508
WTERMSIG(status));
1509
free(fullname);
1510
continue;
1511
} else {
1512
fprintf_plus(stderr, "Warning: network hook \"%s\""
1513
" crashed\n", direntry->d_name);
1514
free(fullname);
1515
continue;
1516
}
1517
}
1518
free(fullname);
1519
if(debug){
1520
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1521
direntry->d_name);
1522
}
1523
}
1524
close(devnull);
1525
}
1526
return true;
1996
perror_plus("setenv");
1997
_exit(EX_OSERR);
1998
}
1999
free(delaystring);
2000
if(connect_to != NULL){
2001
ret = setenv("CONNECT", connect_to, 1);
2002
if(ret == -1){
2003
perror_plus("setenv");
2004
_exit(EX_OSERR);
2005
}
2006
}
2007
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2008
direntry->d_name,
2009
O_RDONLY));
2010
if(hook_fd == -1){
2011
perror_plus("openat");
2012
_exit(EXIT_FAILURE);
2013
}
2014
if(close(hookdir_fd) == -1){
2015
perror_plus("close");
2016
_exit(EXIT_FAILURE);
2017
}
2018
ret = dup2(devnull, STDIN_FILENO);
2019
if(ret == -1){
2020
perror_plus("dup2(devnull, STDIN_FILENO)");
2021
_exit(EX_OSERR);
2022
}
2023
ret = close(devnull);
2024
if(ret == -1){
2025
perror_plus("close");
2026
_exit(EX_OSERR);
2027
}
2028
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2029
if(ret == -1){
2030
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2031
_exit(EX_OSERR);
2032
}
2033
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2034
environ) == -1){
2035
perror_plus("fexecve");
2036
_exit(EXIT_FAILURE);
2037
}
2038
} else {
2039
if(hook_pid == -1){
2040
perror_plus("fork");
2041
free(direntry);
2042
continue;
2043
}
2044
int status;
2045
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2046
perror_plus("waitpid");
2047
free(direntry);
2048
continue;
2049
}
2050
if(WIFEXITED(status)){
2051
if(WEXITSTATUS(status) != 0){
2052
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2053
" with status %d\n", direntry->d_name,
2054
WEXITSTATUS(status));
2055
free(direntry);
2056
continue;
2057
}
2058
} else if(WIFSIGNALED(status)){
2059
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2060
" signal %d\n", direntry->d_name,
2061
WTERMSIG(status));
2062
free(direntry);
2063
continue;
2064
} else {
2065
fprintf_plus(stderr, "Warning: network hook \"%s\""
2066
" crashed\n", direntry->d_name);
2067
free(direntry);
2068
continue;
2069
}
2070
}
2071
if(debug){
2072
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2073
direntry->d_name);
2074
}
2075
free(direntry);
2076
}
2077
free(direntries);
2078
if(close(hookdir_fd) == -1){
2079
perror_plus("close");
2080
} else {
2081
hookdir_fd = -1;
2082
}
2083
close(devnull);
2084
}
2085
2086
__attribute__((nonnull, warn_unused_result))
2087
int bring_up_interface(const char *const interface,
2088
const float delay){
2089
int old_errno = errno;
2090
int ret;
2091
struct ifreq network;
2092
unsigned int if_index = if_nametoindex(interface);
2093
if(if_index == 0){
2094
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2095
errno = old_errno;
2096
return ENXIO;
2097
}
2098
2099
if(quit_now){
2100
errno = old_errno;
2101
return EINTR;
2102
}
2103
2104
if(not interface_is_up(interface)){
2105
int ret_errno = 0;
2106
int ioctl_errno = 0;
2107
if(not get_flags(interface, &network)){
2108
ret_errno = errno;
2109
fprintf_plus(stderr, "Failed to get flags for interface "
2110
"\"%s\"\n", interface);
2111
errno = old_errno;
2112
return ret_errno;
2113
}
2114
network.ifr_flags |= IFF_UP; /* set flag */
2115
2116
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2117
if(sd == -1){
2118
ret_errno = errno;
2119
perror_plus("socket");
2120
errno = old_errno;
2121
return ret_errno;
2122
}
2123
2124
if(quit_now){
2125
ret = close(sd);
2126
if(ret == -1){
2127
perror_plus("close");
2128
}
2129
errno = old_errno;
2130
return EINTR;
2131
}
2132
2133
if(debug){
2134
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2135
interface);
2136
}
2137
2138
/* Raise privileges */
2139
ret_errno = raise_privileges();
2140
if(ret_errno != 0){
2141
errno = ret_errno;
2142
perror_plus("Failed to raise privileges");
2143
}
2144
2145
#ifdef __linux__
2146
int ret_linux;
2147
bool restore_loglevel = false;
2148
if(ret_errno == 0){
2149
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2150
messages about the network interface to mess up the prompt */
2151
ret_linux = klogctl(8, NULL, 5);
2152
if(ret_linux == -1){
2153
perror_plus("klogctl");
2154
} else {
2155
restore_loglevel = true;
2156
}
2157
}
2158
#endif /* __linux__ */
2159
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2160
ioctl_errno = errno;
2161
#ifdef __linux__
2162
if(restore_loglevel){
2163
ret_linux = klogctl(7, NULL, 0);
2164
if(ret_linux == -1){
2165
perror_plus("klogctl");
2166
}
2167
}
2168
#endif /* __linux__ */
2169
2170
/* If raise_privileges() succeeded above */
2171
if(ret_errno == 0){
2172
/* Lower privileges */
2173
ret_errno = lower_privileges();
2174
if(ret_errno != 0){
2175
errno = ret_errno;
2176
perror_plus("Failed to lower privileges");
2177
}
2178
}
2179
2180
/* Close the socket */
2181
ret = close(sd);
2182
if(ret == -1){
2183
perror_plus("close");
2184
}
2185
2186
if(ret_setflags == -1){
2187
errno = ioctl_errno;
2188
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2189
errno = old_errno;
2190
return ioctl_errno;
2191
}
2192
} else if(debug){
2193
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2194
interface);
2195
}
2196
2197
/* Sleep checking until interface is running.
2198
Check every 0.25s, up to total time of delay */
2199
for(int i = 0; i < delay * 4; i++){
2200
if(interface_is_running(interface)){
2201
break;
2202
}
2203
struct timespec sleeptime = { .tv_nsec = 250000000 };
2204
ret = nanosleep(&sleeptime, NULL);
2205
if(ret == -1 and errno != EINTR){
2206
perror_plus("nanosleep");
2207
}
2208
}
2209
2210
errno = old_errno;
2211
return 0;
2212
}
2213
2214
__attribute__((nonnull, warn_unused_result))
2215
int take_down_interface(const char *const interface){
2216
int old_errno = errno;
2217
struct ifreq network;
2218
unsigned int if_index = if_nametoindex(interface);
2219
if(if_index == 0){
2220
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2221
errno = old_errno;
2222
return ENXIO;
2223
}
2224
if(interface_is_up(interface)){
2225
int ret_errno = 0;
2226
int ioctl_errno = 0;
2227
if(not get_flags(interface, &network) and debug){
2228
ret_errno = errno;
2229
fprintf_plus(stderr, "Failed to get flags for interface "
2230
"\"%s\"\n", interface);
2231
errno = old_errno;
2232
return ret_errno;
2233
}
2234
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2235
2236
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2237
if(sd == -1){
2238
ret_errno = errno;
2239
perror_plus("socket");
2240
errno = old_errno;
2241
return ret_errno;
2242
}
2243
2244
if(debug){
2245
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2246
interface);
2247
}
2248
2249
/* Raise privileges */
2250
ret_errno = raise_privileges();
2251
if(ret_errno != 0){
2252
errno = ret_errno;
2253
perror_plus("Failed to raise privileges");
2254
}
2255
2256
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2257
ioctl_errno = errno;
2258
2259
/* If raise_privileges() succeeded above */
2260
if(ret_errno == 0){
2261
/* Lower privileges */
2262
ret_errno = lower_privileges();
2263
if(ret_errno != 0){
2264
errno = ret_errno;
2265
perror_plus("Failed to lower privileges");
2266
}
2267
}
2268
2269
/* Close the socket */
2270
int ret = close(sd);
2271
if(ret == -1){
2272
perror_plus("close");
2273
}
2274
2275
if(ret_setflags == -1){
2276
errno = ioctl_errno;
2277
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2278
errno = old_errno;
2279
return ioctl_errno;
2280
}
2281
} else if(debug){
2282
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2283
interface);
2284
}
2285
2286
errno = old_errno;
2287
return 0;
1527
2288
}
1528
2289
1529
2290
int main(int argc, char *argv[]){
2291
mandos_context mc = { .server = NULL, .dh_bits = 0,
2292
.priority = "SECURE256:!CTYPE-X.509"
2293
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2294
.current_server = NULL, .interfaces = NULL,
2295
.interfaces_size = 0 };
1530
2296
AvahiSServiceBrowser *sb = NULL;
1531
int error;
2297
error_t ret_errno;
1532
2298
int ret;
1533
2299
intmax_t tmpmax;
1534
2300
char *tmp;
1535
2301
int exitcode = EXIT_SUCCESS;
1536
const char *interface = "";
1537
struct ifreq network;
1538
int sd = -1;
1539
bool take_down_interface = false;
1540
uid_t uid;
1541
gid_t gid;
1542
char tempdir[] = "/tmp/mandosXXXXXX";
1543
bool tempdir_created = false;
2302
char *interfaces_to_take_down = NULL;
2303
size_t interfaces_to_take_down_size = 0;
2304
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2305
char old_tempdir[] = "/tmp/mandosXXXXXX";
2306
char *tempdir = NULL;
1544
2307
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1545
2308
const char *seckey = PATHDIR "/" SECKEY;
1546
2309
const char *pubkey = PATHDIR "/" PUBKEY;
2310
const char *dh_params_file = NULL;
2311
char *interfaces_hooks = NULL;
1547
2312
1548
2313
bool gnutls_initialized = false;
1549
2314
bool gpgme_initialized = false;
1601
2366
.doc = "Bit length of the prime number used in the"
1602
2367
" Diffie-Hellman key exchange",
1603
2368
.group = 2 },
2369
{ .name = "dh-params", .key = 134,
2370
.arg = "FILE",
2371
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2372
" for the Diffie-Hellman key exchange",
2373
.group = 2 },
1604
2374
{ .name = "priority", .key = 130,
1605
2375
.arg = "STRING",
1606
2376
.doc = "GnuTLS priority string for the TLS handshake",
1640
2410
connect_to = arg;
1641
2411
break;
1642
2412
case 'i': /* --interface */
1643
interface = arg;
2413
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2414
arg, (int)',');
2415
if(ret_errno != 0){
2416
argp_error(state, "%s", strerror(ret_errno));
2417
}
1644
2418
break;
1645
2419
case 's': /* --seckey */
1646
2420
seckey = arg;
1657
2431
}
1658
2432
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1659
2433
break;
2434
case 134: /* --dh-params */
2435
dh_params_file = arg;
2436
break;
1660
2437
case 130: /* --priority */
1661
2438
mc.priority = arg;
1662
2439
break;
1702
2479
.args_doc = "",
1703
2480
.doc = "Mandos client -- Get and decrypt"
1704
2481
" passwords from a Mandos server" };
1705
ret = argp_parse(&argp, argc, argv,
1706
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1707
switch(ret){
2482
ret_errno = argp_parse(&argp, argc, argv,
2483
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2484
switch(ret_errno){
1708
2485
case 0:
1709
2486
break;
1710
2487
case ENOMEM:
1711
2488
default:
1712
errno = ret;
2489
errno = ret_errno;
1713
2490
perror_plus("argp_parse");
1714
2491
exitcode = EX_OSERR;
1715
2492
goto end;
1718
2495
goto end;
1719
2496
}
1720
2497
}
1721
2498
1722
2499
{
1723
2500
/* Work around Debian bug #633582:
1724
<http://bugs.debian.org/633582> */
2501
<https://bugs.debian.org/633582> */
1725
2502
1726
/* Re-raise priviliges */
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror_plus("seteuid");
2503
/* Re-raise privileges */
2504
ret = raise_privileges();
2505
if(ret != 0){
2506
errno = ret;
2507
perror_plus("Failed to raise privileges");
1731
2508
} else {
1732
2509
struct stat st;
1733
2510
1748
2525
}
1749
2526
}
1750
2527
}
1751
TEMP_FAILURE_RETRY(close(seckey_fd));
2528
close(seckey_fd);
1752
2529
}
1753
2530
}
1754
2531
1755
2532
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1756
2533
int pubkey_fd = open(pubkey, O_RDONLY);
1757
2534
if(pubkey_fd == -1){
1769
2546
}
1770
2547
}
1771
2548
}
1772
TEMP_FAILURE_RETRY(close(pubkey_fd));
1773
}
1774
}
1775
2549
close(pubkey_fd);
2550
}
2551
}
2552
2553
if(dh_params_file != NULL
2554
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2555
int dhparams_fd = open(dh_params_file, O_RDONLY);
2556
if(dhparams_fd == -1){
2557
perror_plus("open");
2558
} else {
2559
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2560
if(ret == -1){
2561
perror_plus("fstat");
2562
} else {
2563
if(S_ISREG(st.st_mode)
2564
and st.st_uid == 0 and st.st_gid == 0){
2565
ret = fchown(dhparams_fd, uid, gid);
2566
if(ret == -1){
2567
perror_plus("fchown");
2568
}
2569
}
2570
}
2571
close(dhparams_fd);
2572
}
2573
}
2574
1776
2575
/* Lower privileges */
1777
errno = 0;
1778
ret = seteuid(uid);
1779
if(ret == -1){
1780
perror_plus("seteuid");
2576
ret = lower_privileges();
2577
if(ret != 0){
2578
errno = ret;
2579
perror_plus("Failed to lower privileges");
2580
}
2581
}
2582
}
2583
2584
/* Remove invalid interface names (except "none") */
2585
{
2586
char *interface = NULL;
2587
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2588
interface))){
2589
if(strcmp(interface, "none") != 0
2590
and if_nametoindex(interface) == 0){
2591
if(interface[0] != '\0'){
2592
fprintf_plus(stderr, "Not using nonexisting interface"
2593
" \"%s\"\n", interface);
2594
}
2595
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2596
interface = NULL;
1781
2597
}
1782
2598
}
1783
2599
}
1784
2600
1785
2601
/* Run network hooks */
1786
if(not run_network_hooks("start", interface, delay)){
1787
goto end;
2602
{
2603
if(mc.interfaces != NULL){
2604
interfaces_hooks = malloc(mc.interfaces_size);
2605
if(interfaces_hooks == NULL){
2606
perror_plus("malloc");
2607
goto end;
2608
}
2609
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2610
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2611
}
2612
run_network_hooks("start", interfaces_hooks != NULL ?
2613
interfaces_hooks : "", delay);
1788
2614
}
1789
2615
1790
2616
if(not debug){
1791
2617
avahi_set_log_function(empty_log);
1792
2618
}
1793
2619
1794
if(interface[0] == '\0'){
1795
struct dirent **direntries;
1796
/* First look for interfaces that are up */
1797
ret = scandir(sys_class_net, &direntries, up_interface,
1798
alphasort);
1799
if(ret == 0){
1800
/* No up interfaces, look for any good interfaces */
1801
free(direntries);
1802
ret = scandir(sys_class_net, &direntries, good_interface,
1803
alphasort);
1804
}
1805
if(ret >= 1){
1806
/* Pick the first interface returned */
1807
interface = strdup(direntries[0]->d_name);
1808
if(debug){
1809
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1810
}
1811
if(interface == NULL){
1812
perror_plus("malloc");
1813
free(direntries);
1814
exitcode = EXIT_FAILURE;
1815
goto end;
1816
}
1817
free(direntries);
1818
} else {
1819
free(direntries);
1820
fprintf_plus(stderr, "Could not find a network interface\n");
1821
exitcode = EXIT_FAILURE;
1822
goto end;
1823
}
1824
}
1825
1826
2620
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1827
2621
from the signal handler */
1828
2622
/* Initialize the pseudo-RNG for Avahi */
1829
2623
srand((unsigned int) time(NULL));
1830
mc.simple_poll = avahi_simple_poll_new();
1831
if(mc.simple_poll == NULL){
2624
simple_poll = avahi_simple_poll_new();
2625
if(simple_poll == NULL){
1832
2626
fprintf_plus(stderr,
1833
2627
"Avahi: Failed to create simple poll object.\n");
1834
2628
exitcode = EX_UNAVAILABLE;
1898
2692
}
1899
2693
}
1900
2694
1901
/* If the interface is down, bring it up */
1902
if(strcmp(interface, "none") != 0){
1903
if_index = (AvahiIfIndex) if_nametoindex(interface);
1904
if(if_index == 0){
1905
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1906
exitcode = EX_UNAVAILABLE;
1907
goto end;
1908
}
1909
1910
if(quit_now){
1911
goto end;
1912
}
1913
1914
/* Re-raise priviliges */
1915
errno = 0;
1916
ret = seteuid(0);
1917
if(ret == -1){
1918
perror_plus("seteuid");
1919
}
1920
1921
#ifdef __linux__
1922
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1923
messages about the network interface to mess up the prompt */
1924
ret = klogctl(8, NULL, 5);
1925
bool restore_loglevel = true;
1926
if(ret == -1){
1927
restore_loglevel = false;
1928
perror_plus("klogctl");
1929
}
1930
#endif /* __linux__ */
1931
1932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
if(sd < 0){
1934
perror_plus("socket");
1935
exitcode = EX_OSERR;
1936
#ifdef __linux__
1937
if(restore_loglevel){
1938
ret = klogctl(7, NULL, 0);
1939
if(ret == -1){
1940
perror_plus("klogctl");
1941
}
1942
}
1943
#endif /* __linux__ */
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1950
goto end;
1951
}
1952
strcpy(network.ifr_name, interface);
1953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1954
if(ret == -1){
1955
perror_plus("ioctl SIOCGIFFLAGS");
1956
#ifdef __linux__
1957
if(restore_loglevel){
1958
ret = klogctl(7, NULL, 0);
1959
if(ret == -1){
1960
perror_plus("klogctl");
1961
}
1962
}
1963
#endif /* __linux__ */
1964
exitcode = EX_OSERR;
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1971
goto end;
1972
}
1973
if((network.ifr_flags & IFF_UP) == 0){
1974
network.ifr_flags |= IFF_UP;
1975
take_down_interface = true;
1976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1977
if(ret == -1){
1978
take_down_interface = false;
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1980
exitcode = EX_OSERR;
1981
#ifdef __linux__
1982
if(restore_loglevel){
1983
ret = klogctl(7, NULL, 0);
1984
if(ret == -1){
1985
perror_plus("klogctl");
2695
/* If no interfaces were specified, make a list */
2696
if(mc.interfaces == NULL){
2697
struct dirent **direntries = NULL;
2698
/* Look for any good interfaces */
2699
ret = scandir(sys_class_net, &direntries, good_interface,
2700
alphasort);
2701
if(ret >= 1){
2702
/* Add all found interfaces to interfaces list */
2703
for(int i = 0; i < ret; ++i){
2704
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2705
direntries[i]->d_name);
2706
if(ret_errno != 0){
2707
errno = ret_errno;
2708
perror_plus("argz_add");
2709
free(direntries[i]);
2710
continue;
2711
}
2712
if(debug){
2713
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2714
direntries[i]->d_name);
2715
}
2716
free(direntries[i]);
2717
}
2718
free(direntries);
2719
} else {
2720
if(ret == 0){
2721
free(direntries);
2722
}
2723
fprintf_plus(stderr, "Could not find a network interface\n");
2724
exitcode = EXIT_FAILURE;
2725
goto end;
2726
}
2727
}
2728
2729
/* Bring up interfaces which are down, and remove any "none"s */
2730
{
2731
char *interface = NULL;
2732
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2733
interface))){
2734
/* If interface name is "none", stop bringing up interfaces.
2735
Also remove all instances of "none" from the list */
2736
if(strcmp(interface, "none") == 0){
2737
argz_delete(&mc.interfaces, &mc.interfaces_size,
2738
interface);
2739
interface = NULL;
2740
while((interface = argz_next(mc.interfaces,
2741
mc.interfaces_size, interface))){
2742
if(strcmp(interface, "none") == 0){
2743
argz_delete(&mc.interfaces, &mc.interfaces_size,
2744
interface);
2745
interface = NULL;
1986
2746
}
1987
2747
}
1988
#endif /* __linux__ */
1989
/* Lower privileges */
1990
errno = 0;
1991
ret = seteuid(uid);
1992
if(ret == -1){
1993
perror_plus("seteuid");
1994
}
1995
goto end;
1996
}
1997
}
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
2000
for(int i=0; i < delay * 4; i++){
2001
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2002
if(ret == -1){
2003
perror_plus("ioctl SIOCGIFFLAGS");
2004
} else if(network.ifr_flags & IFF_RUNNING){
2005
2748
break;
2006
2749
}
2007
struct timespec sleeptime = { .tv_nsec = 250000000 };
2008
ret = nanosleep(&sleeptime, NULL);
2009
if(ret == -1 and errno != EINTR){
2010
perror_plus("nanosleep");
2011
}
2012
}
2013
if(not take_down_interface){
2014
/* We won't need the socket anymore */
2015
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2016
if(ret == -1){
2017
perror_plus("close");
2018
}
2019
}
2020
#ifdef __linux__
2021
if(restore_loglevel){
2022
/* Restores kernel loglevel to default */
2023
ret = klogctl(7, NULL, 0);
2024
if(ret == -1){
2025
perror_plus("klogctl");
2026
}
2027
}
2028
#endif /* __linux__ */
2029
/* Lower privileges */
2030
errno = 0;
2031
/* Lower privileges */
2032
ret = seteuid(uid);
2033
if(ret == -1){
2034
perror_plus("seteuid");
2035
}
2750
bool interface_was_up = interface_is_up(interface);
2751
errno = bring_up_interface(interface, delay);
2752
if(not interface_was_up){
2753
if(errno != 0){
2754
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2755
" %s\n", interface, strerror(errno));
2756
} else {
2757
errno = argz_add(&interfaces_to_take_down,
2758
&interfaces_to_take_down_size,
2759
interface);
2760
if(errno != 0){
2761
perror_plus("argz_add");
2762
}
2763
}
2764
}
2765
}
2766
if(debug and (interfaces_to_take_down == NULL)){
2767
fprintf_plus(stderr, "No interfaces were brought up\n");
2768
}
2769
}
2770
2771
/* If we only got one interface, explicitly use only that one */
2772
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2773
if(debug){
2774
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2775
mc.interfaces);
2776
}
2777
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2036
2778
}
2037
2779
2038
2780
if(quit_now){
2039
2781
goto end;
2040
2782
}
2041
2783
2042
ret = init_gnutls_global(pubkey, seckey);
2784
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2043
2785
if(ret == -1){
2044
2786
fprintf_plus(stderr, "init_gnutls_global failed\n");
2045
2787
exitcode = EX_UNAVAILABLE;
2052
2794
goto end;
2053
2795
}
2054
2796
2055
if(mkdtemp(tempdir) == NULL){
2797
/* Try /run/tmp before /tmp */
2798
tempdir = mkdtemp(run_tempdir);
2799
if(tempdir == NULL and errno == ENOENT){
2800
if(debug){
2801
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2802
run_tempdir, old_tempdir);
2803
}
2804
tempdir = mkdtemp(old_tempdir);
2805
}
2806
if(tempdir == NULL){
2056
2807
perror_plus("mkdtemp");
2057
2808
goto end;
2058
2809
}
2059
tempdir_created = true;
2060
2810
2061
2811
if(quit_now){
2062
2812
goto end;
2063
2813
}
2064
2814
2065
if(not init_gpgme(pubkey, seckey, tempdir)){
2815
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2066
2816
fprintf_plus(stderr, "init_gpgme failed\n");
2067
2817
exitcode = EX_UNAVAILABLE;
2068
2818
goto end;
2078
2828
/* Connect directly, do not use Zeroconf */
2079
2829
/* (Mainly meant for debugging) */
2080
2830
char *address = strrchr(connect_to, ':');
2831
2081
2832
if(address == NULL){
2082
2833
fprintf_plus(stderr, "No colon in address\n");
2083
2834
exitcode = EX_USAGE;
2088
2839
goto end;
2089
2840
}
2090
2841
2091
uint16_t port;
2842
in_port_t port;
2092
2843
errno = 0;
2093
2844
tmpmax = strtoimax(address+1, &tmp, 10);
2094
2845
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2095
or tmpmax != (uint16_t)tmpmax){
2846
or tmpmax != (in_port_t)tmpmax){
2096
2847
fprintf_plus(stderr, "Bad port number\n");
2097
2848
exitcode = EX_USAGE;
2098
2849
goto end;
2099
2850
}
2100
2851
2101
2852
if(quit_now){
2102
2853
goto end;
2103
2854
}
2104
2855
2105
port = (uint16_t)tmpmax;
2856
port = (in_port_t)tmpmax;
2106
2857
*address = '\0';
2107
2858
/* Colon in address indicates IPv6 */
2108
2859
int af;
2124
2875
}
2125
2876
2126
2877
while(not quit_now){
2127
ret = start_mandos_communication(address, port, if_index, af);
2878
ret = start_mandos_communication(address, port, if_index, af,
2879
&mc);
2128
2880
if(quit_now or ret == 0){
2129
2881
break;
2130
2882
}
2132
2884
fprintf_plus(stderr, "Retrying in %d seconds\n",
2133
2885
(int)retry_interval);
2134
2886
}
2135
sleep((int)retry_interval);
2887
sleep((unsigned int)retry_interval);
2136
2888
}
2137
2889
2138
if (not quit_now){
2890
if(not quit_now){
2139
2891
exitcode = EXIT_SUCCESS;
2140
2892
}
2141
2893
2156
2908
config.publish_domain = 0;
2157
2909
2158
2910
/* Allocate a new server */
2159
mc.server = avahi_server_new(avahi_simple_poll_get
2160
(mc.simple_poll), &config, NULL,
2161
NULL, &error);
2911
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2912
&config, NULL, NULL, &ret);
2162
2913
2163
2914
/* Free the Avahi configuration data */
2164
2915
avahi_server_config_free(&config);
2167
2918
/* Check if creating the Avahi server object succeeded */
2168
2919
if(mc.server == NULL){
2169
2920
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
2921
avahi_strerror(ret));
2171
2922
exitcode = EX_UNAVAILABLE;
2172
2923
goto end;
2173
2924
}
2179
2930
/* Create the Avahi service browser */
2180
2931
sb = avahi_s_service_browser_new(mc.server, if_index,
2181
2932
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2182
NULL, 0, browse_callback, NULL);
2933
NULL, 0, browse_callback,
2934
(void *)&mc);
2183
2935
if(sb == NULL){
2184
2936
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2185
2937
avahi_strerror(avahi_server_errno(mc.server)));
2196
2948
if(debug){
2197
2949
fprintf_plus(stderr, "Starting Avahi loop search\n");
2198
2950
}
2199
2200
ret = avahi_loop_with_timeout(mc.simple_poll,
2201
(int)(retry_interval * 1000));
2951
2952
ret = avahi_loop_with_timeout(simple_poll,
2953
(int)(retry_interval * 1000), &mc);
2202
2954
if(debug){
2203
2955
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2204
2956
(ret == 0) ? "successfully" : "with error");
2207
2959
end:
2208
2960
2209
2961
if(debug){
2210
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2962
if(signal_received){
2963
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2964
argv[0], signal_received,
2965
strsignal(signal_received));
2966
} else {
2967
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2968
}
2211
2969
}
2212
2970
2213
2971
/* Cleanup things */
2972
free(mc.interfaces);
2973
2214
2974
if(sb != NULL)
2215
2975
avahi_s_service_browser_free(sb);
2216
2976
2217
2977
if(mc.server != NULL)
2218
2978
avahi_server_free(mc.server);
2219
2979
2220
if(mc.simple_poll != NULL)
2221
avahi_simple_poll_free(mc.simple_poll);
2980
if(simple_poll != NULL)
2981
avahi_simple_poll_free(simple_poll);
2222
2982
2223
2983
if(gnutls_initialized){
2224
2984
gnutls_certificate_free_credentials(mc.cred);
2225
gnutls_global_deinit();
2226
2985
gnutls_dh_params_deinit(mc.dh_params);
2227
2986
}
2228
2987
2236
2995
mc.current_server->prev->next = NULL;
2237
2996
while(mc.current_server != NULL){
2238
2997
server *next = mc.current_server->next;
2998
#ifdef __GNUC__
2999
#pragma GCC diagnostic push
3000
#pragma GCC diagnostic ignored "-Wcast-qual"
3001
#endif
3002
free((char *)(mc.current_server->ip));
3003
#ifdef __GNUC__
3004
#pragma GCC diagnostic pop
3005
#endif
2239
3006
free(mc.current_server);
2240
3007
mc.current_server = next;
2241
3008
}
2242
3009
}
2243
3010
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2246
2247
/* Re-raise priviliges */
3011
/* Re-raise privileges */
2248
3012
{
2249
errno = 0;
2250
ret = seteuid(0);
2251
if(ret == -1){
2252
perror_plus("seteuid");
3013
ret = raise_privileges();
3014
if(ret != 0){
3015
errno = ret;
3016
perror_plus("Failed to raise privileges");
3017
} else {
3018
3019
/* Run network hooks */
3020
run_network_hooks("stop", interfaces_hooks != NULL ?
3021
interfaces_hooks : "", delay);
3022
3023
/* Take down the network interfaces which were brought up */
3024
{
3025
char *interface = NULL;
3026
while((interface = argz_next(interfaces_to_take_down,
3027
interfaces_to_take_down_size,
3028
interface))){
3029
ret = take_down_interface(interface);
3030
if(ret != 0){
3031
errno = ret;
3032
perror_plus("Failed to take down interface");
3033
}
3034
}
3035
if(debug and (interfaces_to_take_down == NULL)){
3036
fprintf_plus(stderr, "No interfaces needed to be taken"
3037
" down\n");
3038
}
3039
}
2253
3040
}
2254
3041
2255
/* Take down the network interface */
2256
if(take_down_interface and geteuid() == 0){
2257
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2258
if(ret == -1){
2259
perror_plus("ioctl SIOCGIFFLAGS");
2260
} else if(network.ifr_flags & IFF_UP){
2261
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2262
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2263
if(ret == -1){
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2265
}
2266
}
2267
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
if(ret == -1){
2269
perror_plus("close");
2270
}
3042
ret = lower_privileges_permanently();
3043
if(ret != 0){
3044
errno = ret;
3045
perror_plus("Failed to lower privileges permanently");
2271
3046
}
2272
3047
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
3048
3049
free(interfaces_to_take_down);
3050
free(interfaces_hooks);
3051
3052
void clean_dir_at(int base, const char * const dirname,
3053
uintmax_t level){
3054
struct dirent **direntries = NULL;
3055
int dret;
3056
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3057
O_RDONLY
3058
| O_NOFOLLOW
3059
| O_DIRECTORY
3060
| O_PATH));
3061
if(dir_fd == -1){
3062
perror_plus("open");
3063
}
3064
int numentries = scandirat(dir_fd, ".", &direntries,
3065
notdotentries, alphasort);
3066
if(numentries >= 0){
3067
for(int i = 0; i < numentries; i++){
3068
if(debug){
3069
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3070
dirname, direntries[i]->d_name);
3071
}
3072
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3073
if(dret == -1){
3074
if(errno == EISDIR){
3075
dret = unlinkat(dir_fd, direntries[i]->d_name,
3076
AT_REMOVEDIR);
3077
}
3078
if((dret == -1) and (errno == ENOTEMPTY)
3079
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3080
== 0) and (level == 0)){
3081
/* Recurse only in this special case */
3082
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3083
dret = 0;
3084
}
3085
if(dret == -1){
3086
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3087
direntries[i]->d_name, strerror(errno));
3088
}
3089
}
3090
free(direntries[i]);
3091
}
3092
3093
/* need to clean even if 0 because man page doesn't specify */
3094
free(direntries);
3095
if(numentries == -1){
3096
perror_plus("scandirat");
3097
}
3098
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3099
if(dret == -1 and errno != ENOENT){
3100
perror_plus("rmdir");
3101
}
3102
} else {
3103
perror_plus("scandirat");
3104
}
3105
close(dir_fd);
2278
3106
}
2279
3107
2280
3108
/* Removes the GPGME temp directory and all files inside */
2281
if(tempdir_created){
2282
struct dirent **direntries = NULL;
2283
struct dirent *direntry = NULL;
2284
int numentries = scandir(tempdir, &direntries, notdotentries,
2285
alphasort);
2286
if (numentries > 0){
2287
for(int i = 0; i < numentries; i++){
2288
direntry = direntries[i];
2289
char *fullname = NULL;
2290
ret = asprintf(&fullname, "%s/%s", tempdir,
2291
direntry->d_name);
2292
if(ret < 0){
2293
perror_plus("asprintf");
2294
continue;
2295
}
2296
ret = remove(fullname);
2297
if(ret == -1){
2298
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2299
strerror(errno));
2300
}
2301
free(fullname);
2302
}
2303
}
2304
2305
/* need to clean even if 0 because man page doesn't specify */
2306
free(direntries);
2307
if (numentries == -1){
2308
perror_plus("scandir");
2309
}
2310
ret = rmdir(tempdir);
2311
if(ret == -1 and errno != ENOENT){
2312
perror_plus("rmdir");
2313
}
3109
if(tempdir != NULL){
3110
clean_dir_at(-1, tempdir, 0);
2314
3111
}
2315
3112
2316
3113
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0