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- Committer: Teddy Hogeborn
- Date: 2016-02-29 22:51:57 UTC
- mfrom: (237.4.65 release)
- Revision ID: teddy@recompile.se-20160229225157-if6c17o8ziwncvro
Merge from release branch.
- files added:
- debian/mandos-client.examples
- debian/upstream
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
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;
170
182
171
183
/* Function to use when printing errors */
172
184
void perror_plus(const char *print_text){
185
int e = errno;
173
186
fprintf(stderr, "Mandos plugin %s: ",
174
187
program_invocation_short_name);
188
errno = e;
175
189
perror(print_text);
176
190
}
177
191
192
__attribute__((format (gnu_printf, 2, 3), nonnull))
178
193
int fprintf_plus(FILE *stream, const char *format, ...){
179
194
va_list ap;
180
195
va_start (ap, format);
181
196
182
197
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
198
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
199
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
200
}
186
201
187
202
/*
189
204
* bytes. "buffer_capacity" is how much is currently allocated,
190
205
* "buffer_length" is how much is already used.
191
206
*/
207
__attribute__((nonnull, warn_unused_result))
192
208
size_t incbuffer(char **buffer, size_t buffer_length,
193
209
size_t buffer_capacity){
194
210
if(buffer_length + BUFFER_SIZE > buffer_capacity){
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
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;
197
217
return 0;
198
218
}
219
*buffer = new_buf;
199
220
buffer_capacity += BUFFER_SIZE;
200
221
}
201
222
return buffer_capacity;
202
223
}
203
224
204
225
/* Add server to set of servers to retry periodically */
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
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){
207
229
int ret;
208
230
server *new_server = malloc(sizeof(server));
209
231
if(new_server == NULL){
210
232
perror_plus("malloc");
211
return -1;
233
return false;
212
234
}
213
235
*new_server = (server){ .ip = strdup(ip),
214
236
.port = port,
216
238
.af = af };
217
239
if(new_server->ip == NULL){
218
240
perror_plus("strdup");
219
return -1;
241
free(new_server);
242
return false;
243
}
244
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
245
if(ret == -1){
246
perror_plus("clock_gettime");
247
#ifdef __GNUC__
248
#pragma GCC diagnostic push
249
#pragma GCC diagnostic ignored "-Wcast-qual"
250
#endif
251
free((char *)(new_server->ip));
252
#ifdef __GNUC__
253
#pragma GCC diagnostic pop
254
#endif
255
free(new_server);
256
return false;
220
257
}
221
258
/* Special case of first server */
222
if (mc.current_server == NULL){
259
if(*current_server == NULL){
223
260
new_server->next = new_server;
224
261
new_server->prev = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
262
*current_server = new_server;
227
263
} else {
228
new_server->next = mc.current_server;
229
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;
230
267
new_server->prev->next = new_server;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return -1;
237
}
238
return 0;
268
(*current_server)->prev = new_server;
269
}
270
return true;
239
271
}
240
272
241
273
/*
242
274
* Initialize GPGME.
243
275
*/
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
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){
246
281
gpgme_error_t rc;
247
282
gpgme_engine_info_t engine_info;
248
283
249
250
284
/*
251
285
* Helper function to insert pub and seckey to the engine keyring.
252
286
*/
253
bool import_key(const char *filename){
287
bool import_key(const char * const filename){
254
288
int ret;
255
289
int fd;
256
290
gpgme_data_t pgp_data;
268
302
return false;
269
303
}
270
304
271
rc = gpgme_op_import(mc.ctx, pgp_data);
305
rc = gpgme_op_import(mc->ctx, pgp_data);
272
306
if(rc != GPG_ERR_NO_ERROR){
273
307
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
308
gpgme_strsource(rc), gpgme_strerror(rc));
275
309
return false;
276
310
}
277
311
278
ret = (int)TEMP_FAILURE_RETRY(close(fd));
312
ret = close(fd);
279
313
if(ret == -1){
280
314
perror_plus("close");
281
315
}
318
352
}
319
353
320
354
/* Create new GPGME "context" */
321
rc = gpgme_new(&(mc.ctx));
355
rc = gpgme_new(&(mc->ctx));
322
356
if(rc != GPG_ERR_NO_ERROR){
323
357
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
358
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
337
371
* Decrypt OpenPGP data.
338
372
* Returns -1 on error
339
373
*/
374
__attribute__((nonnull, warn_unused_result))
340
375
static ssize_t pgp_packet_decrypt(const char *cryptotext,
341
376
size_t crypto_size,
342
char **plaintext){
377
char **plaintext,
378
mandos_context *mc){
343
379
gpgme_data_t dh_crypto, dh_plain;
344
380
gpgme_error_t rc;
345
381
ssize_t ret;
371
407
372
408
/* Decrypt data from the cryptotext data buffer to the plaintext
373
409
data buffer */
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
410
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
375
411
if(rc != GPG_ERR_NO_ERROR){
376
412
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
413
gpgme_strsource(rc), gpgme_strerror(rc));
378
414
plaintext_length = -1;
379
415
if(debug){
380
416
gpgme_decrypt_result_t result;
381
result = gpgme_op_decrypt_result(mc.ctx);
417
result = gpgme_op_decrypt_result(mc->ctx);
382
418
if(result == NULL){
383
419
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
384
420
} else {
461
497
return plaintext_length;
462
498
}
463
499
464
static const char * safer_gnutls_strerror(int value){
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
467
if(ret == NULL)
468
ret = "(unknown)";
469
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);
470
511
}
471
512
472
513
/* GnuTLS log function callback */
514
__attribute__((nonnull))
473
515
static void debuggnutls(__attribute__((unused)) int level,
474
516
const char* string){
475
517
fprintf_plus(stderr, "GnuTLS: %s", string);
476
518
}
477
519
520
__attribute__((nonnull(1, 2, 4), warn_unused_result))
478
521
static int init_gnutls_global(const char *pubkeyfilename,
479
const char *seckeyfilename){
522
const char *seckeyfilename,
523
const char *dhparamsfilename,
524
mandos_context *mc){
480
525
int ret;
526
unsigned int uret;
481
527
482
528
if(debug){
483
529
fprintf_plus(stderr, "Initializing GnuTLS\n");
484
530
}
485
531
486
ret = gnutls_global_init();
487
if(ret != GNUTLS_E_SUCCESS){
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
490
return -1;
491
}
492
493
532
if(debug){
494
533
/* "Use a log level over 10 to enable all debugging options."
495
534
* - GnuTLS manual
499
538
}
500
539
501
540
/* OpenPGP credentials */
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
541
ret = gnutls_certificate_allocate_credentials(&mc->cred);
503
542
if(ret != GNUTLS_E_SUCCESS){
504
543
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
544
safer_gnutls_strerror(ret));
506
gnutls_global_deinit();
507
545
return -1;
508
546
}
509
547
515
553
}
516
554
517
555
ret = gnutls_certificate_set_openpgp_key_file
518
(mc.cred, pubkeyfilename, seckeyfilename,
556
(mc->cred, pubkeyfilename, seckeyfilename,
519
557
GNUTLS_OPENPGP_FMT_BASE64);
520
558
if(ret != GNUTLS_E_SUCCESS){
521
559
fprintf_plus(stderr,
527
565
}
528
566
529
567
/* GnuTLS server initialization */
530
ret = gnutls_dh_params_init(&mc.dh_params);
568
ret = gnutls_dh_params_init(&mc->dh_params);
531
569
if(ret != GNUTLS_E_SUCCESS){
532
570
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
571
" initialization: %s\n",
534
572
safer_gnutls_strerror(ret));
535
573
goto globalfail;
536
574
}
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
538
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
541
goto globalfail;
542
}
543
544
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);
545
748
546
749
return 0;
547
750
548
751
globalfail:
549
752
550
gnutls_certificate_free_credentials(mc.cred);
551
gnutls_global_deinit();
552
gnutls_dh_params_deinit(mc.dh_params);
753
gnutls_certificate_free_credentials(mc->cred);
754
gnutls_dh_params_deinit(mc->dh_params);
553
755
return -1;
554
756
}
555
757
556
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){
557
761
int ret;
558
762
/* GnuTLS session creation */
559
763
do {
571
775
{
572
776
const char *err;
573
777
do {
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
778
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
575
779
if(quit_now){
576
780
gnutls_deinit(*session);
577
781
return -1;
588
792
589
793
do {
590
794
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
591
mc.cred);
795
mc->cred);
592
796
if(quit_now){
593
797
gnutls_deinit(*session);
594
798
return -1;
604
808
/* ignore client certificate if any. */
605
809
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
606
810
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
608
609
811
return 0;
610
812
}
611
813
613
815
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
614
816
__attribute__((unused)) const char *txt){}
615
817
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
error_t raise_privileges(void){
821
error_t old_errno = errno;
822
error_t ret_errno = 0;
823
if(seteuid(0) == -1){
824
ret_errno = errno;
825
}
826
errno = old_errno;
827
return ret_errno;
828
}
829
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
error_t raise_privileges_permanently(void){
833
error_t old_errno = errno;
834
error_t ret_errno = raise_privileges();
835
if(ret_errno != 0){
836
errno = old_errno;
837
return ret_errno;
838
}
839
if(setuid(0) == -1){
840
ret_errno = errno;
841
}
842
errno = old_errno;
843
return ret_errno;
844
}
845
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
error_t lower_privileges(void){
849
error_t old_errno = errno;
850
error_t ret_errno = 0;
851
if(seteuid(uid) == -1){
852
ret_errno = errno;
853
}
854
errno = old_errno;
855
return ret_errno;
856
}
857
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
error_t lower_privileges_permanently(void){
861
error_t old_errno = errno;
862
error_t ret_errno = 0;
863
if(setuid(uid) == -1){
864
ret_errno = errno;
865
}
866
errno = old_errno;
867
return ret_errno;
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
616
1036
/* Called when a Mandos server is found */
617
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,
618
1039
AvahiIfIndex if_index,
619
int af){
1040
int af, mandos_context *mc){
620
1041
int ret, tcp_sd = -1;
621
1042
ssize_t sret;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
1043
struct sockaddr_storage to;
626
1044
char *buffer = NULL;
627
1045
char *decrypted_buffer = NULL;
628
1046
size_t buffer_length = 0;
631
1049
int retval = -1;
632
1050
gnutls_session_t session;
633
1051
int pf; /* Protocol family */
1052
bool route_added = false;
634
1053
635
1054
errno = 0;
636
1055
652
1071
return -1;
653
1072
}
654
1073
655
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);
656
1107
if(ret != 0){
657
1108
return -1;
658
1109
}
659
1110
660
1111
if(debug){
661
1112
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
1113
PRIuMAX "\n", ip, (uintmax_t)port);
663
1114
}
664
1115
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
666
1117
if(tcp_sd < 0){
667
1118
int e = errno;
668
1119
perror_plus("socket");
675
1126
goto mandos_end;
676
1127
}
677
1128
678
memset(&to, 0, sizeof(to));
679
1129
if(af == AF_INET6){
680
to.in6.sin6_family = (sa_family_t)af;
681
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);
682
1133
} else { /* IPv4 */
683
to.in.sin_family = (sa_family_t)af;
684
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);
685
1137
}
686
1138
if(ret < 0 ){
687
1139
int e = errno;
696
1148
goto mandos_end;
697
1149
}
698
1150
if(af == AF_INET6){
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
1151
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1152
if(IN6_IS_ADDR_LINKLOCAL
1153
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
706
1154
if(if_index == AVAHI_IF_UNSPEC){
707
1155
fprintf_plus(stderr, "An IPv6 link-local address is"
708
1156
" incomplete without a network interface\n");
710
1158
goto mandos_end;
711
1159
}
712
1160
/* Set the network interface number as scope */
713
to.in6.sin6_scope_id = (uint32_t)if_index;
1161
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
714
1162
}
715
1163
} else {
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
1164
((struct sockaddr_in *)&to)->sin_port = htons(port);
719
1165
}
720
1166
721
1167
if(quit_now){
729
1175
if(if_indextoname((unsigned int)if_index, interface) == NULL){
730
1176
perror_plus("if_indextoname");
731
1177
} else {
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
1178
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1179
"\n", ip, interface, (uintmax_t)port);
734
1180
}
735
1181
} else {
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
1182
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1183
ip, (uintmax_t)port);
738
1184
}
739
1185
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
740
1186
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
741
const char *pcret;
742
if(af == AF_INET6){
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
745
} else {
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
748
}
749
if(pcret == NULL){
750
perror_plus("inet_ntop");
751
} else {
752
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
754
}
755
}
756
}
757
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
761
}
762
763
if(af == AF_INET6){
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
765
} else {
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
767
}
768
if(ret < 0){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
int e = errno;
771
perror_plus("connect");
772
errno = e;
773
}
774
goto mandos_end;
775
}
776
777
if(quit_now){
778
errno = EINTR;
779
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
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1241
https://bugs.debian.org/587961
1242
*/
1243
if(debug){
1244
fprintf_plus(stderr, "Mandos server unreachable, trying"
1245
" direct route\n");
1246
}
1247
int e = errno;
1248
route_added = add_local_route(ip, if_index);
1249
if(route_added){
1250
continue;
1251
}
1252
errno = e;
1253
}
1254
if(errno != ECONNREFUSED or debug){
1255
int e = errno;
1256
perror_plus("connect");
1257
errno = e;
1258
}
1259
goto mandos_end;
1260
}
1261
1262
if(quit_now){
1263
errno = EINTR;
1264
goto mandos_end;
1265
}
1266
break;
780
1267
}
781
1268
782
1269
const char *out = mandos_protocol_version;
818
1305
goto mandos_end;
819
1306
}
820
1307
821
/* Spurious warning from -Wint-to-pointer-cast */
822
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);
823
1313
824
1314
if(quit_now){
825
1315
errno = EINTR;
930
1420
if(buffer_length > 0){
931
1421
ssize_t decrypted_buffer_size;
932
1422
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
933
&decrypted_buffer);
1423
&decrypted_buffer, mc);
934
1424
if(decrypted_buffer_size >= 0){
935
1425
936
1426
written = 0;
962
1452
963
1453
mandos_end:
964
1454
{
1455
if(route_added){
1456
if(not delete_local_route(ip, if_index)){
1457
fprintf_plus(stderr, "Failed to delete local route to %s on"
1458
" interface %d", ip, if_index);
1459
}
1460
}
965
1461
int e = errno;
966
1462
free(decrypted_buffer);
967
1463
free(buffer);
968
1464
if(tcp_sd >= 0){
969
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1465
ret = close(tcp_sd);
970
1466
}
971
1467
if(ret == -1){
972
1468
if(e == 0){
984
1480
return retval;
985
1481
}
986
1482
1483
__attribute__((nonnull))
987
1484
static void resolve_callback(AvahiSServiceResolver *r,
988
1485
AvahiIfIndex interface,
989
1486
AvahiProtocol proto,
997
1494
AVAHI_GCC_UNUSED AvahiStringList *txt,
998
1495
AVAHI_GCC_UNUSED AvahiLookupResultFlags
999
1496
flags,
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1497
void *mc){
1498
if(r == NULL){
1499
return;
1500
}
1002
1501
1003
1502
/* Called whenever a service has been resolved successfully or
1004
1503
timed out */
1005
1504
1006
1505
if(quit_now){
1506
avahi_s_service_resolver_free(r);
1007
1507
return;
1008
1508
}
1009
1509
1013
1513
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
1514
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
1515
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
1516
avahi_strerror(avahi_server_errno
1517
(((mandos_context*)mc)->server)));
1017
1518
break;
1018
1519
1019
1520
case AVAHI_RESOLVER_FOUND:
1025
1526
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
1527
host_name, ip, (intmax_t)interface, port);
1027
1528
}
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1529
int ret = start_mandos_communication(ip, (in_port_t)port,
1530
interface,
1531
avahi_proto_to_af(proto),
1532
mc);
1030
1533
if(ret == 0){
1031
avahi_simple_poll_quit(mc.simple_poll);
1534
avahi_simple_poll_quit(simple_poll);
1032
1535
} else {
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1536
if(not add_server(ip, (in_port_t)port, interface,
1537
avahi_proto_to_af(proto),
1538
&((mandos_context*)mc)->current_server)){
1539
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1540
" list\n", name);
1541
}
1035
1542
}
1036
1543
}
1037
1544
}
1047
1554
const char *domain,
1048
1555
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1049
1556
flags,
1050
AVAHI_GCC_UNUSED void* userdata){
1051
assert(b);
1557
void *mc){
1558
if(b == NULL){
1559
return;
1560
}
1052
1561
1053
1562
/* Called whenever a new services becomes available on the LAN or
1054
1563
is removed from the LAN */
1062
1571
case AVAHI_BROWSER_FAILURE:
1063
1572
1064
1573
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1574
avahi_strerror(avahi_server_errno
1575
(((mandos_context*)mc)->server)));
1576
avahi_simple_poll_quit(simple_poll);
1067
1577
return;
1068
1578
1069
1579
case AVAHI_BROWSER_NEW:
1072
1582
the callback function is called the Avahi server will free the
1073
1583
resolver for us. */
1074
1584
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1585
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1586
interface, protocol, name, type,
1587
domain, protocol, 0,
1588
resolve_callback, mc) == NULL)
1078
1589
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1079
1590
" %s\n", name,
1080
avahi_strerror(avahi_server_errno(mc.server)));
1591
avahi_strerror(avahi_server_errno
1592
(((mandos_context*)mc)->server)));
1081
1593
break;
1082
1594
1083
1595
case AVAHI_BROWSER_REMOVE:
1102
1614
signal_received = sig;
1103
1615
int old_errno = errno;
1104
1616
/* set main loop to exit */
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1617
if(simple_poll != NULL){
1618
avahi_simple_poll_quit(simple_poll);
1107
1619
}
1108
1620
errno = old_errno;
1109
1621
}
1110
1622
1623
__attribute__((nonnull, warn_unused_result))
1111
1624
bool get_flags(const char *ifname, struct ifreq *ifr){
1112
1625
int ret;
1626
error_t ret_errno;
1113
1627
1114
1628
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
1629
if(s < 0){
1630
ret_errno = errno;
1116
1631
perror_plus("socket");
1632
errno = ret_errno;
1117
1633
return false;
1118
1634
}
1119
strcpy(ifr->ifr_name, ifname);
1635
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1636
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1120
1637
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1121
1638
if(ret == -1){
1122
1639
if(debug){
1640
ret_errno = errno;
1123
1641
perror_plus("ioctl SIOCGIFFLAGS");
1642
errno = ret_errno;
1124
1643
}
1125
1644
return false;
1126
1645
}
1127
1646
return true;
1128
1647
}
1129
1648
1649
__attribute__((nonnull, warn_unused_result))
1130
1650
bool good_flags(const char *ifname, const struct ifreq *ifr){
1131
1651
1132
1652
/* Reject the loopback device */
1174
1694
* corresponds to an acceptable network device.
1175
1695
* (This function is passed to scandir(3) as a filter function.)
1176
1696
*/
1697
__attribute__((nonnull, warn_unused_result))
1177
1698
int good_interface(const struct dirent *if_entry){
1178
1699
if(if_entry->d_name[0] == '.'){
1179
1700
return 0;
1195
1716
}
1196
1717
1197
1718
/*
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1238
}
1239
1719
* This function determines if a network interface is up.
1720
*/
1721
__attribute__((nonnull, warn_unused_result))
1722
bool interface_is_up(const char *interface){
1723
struct ifreq ifr;
1724
if(not get_flags(interface, &ifr)){
1725
if(debug){
1726
fprintf_plus(stderr, "Failed to get flags for interface "
1727
"\"%s\"\n", interface);
1728
}
1729
return false;
1730
}
1731
1732
return (bool)(ifr.ifr_flags & IFF_UP);
1733
}
1734
1735
/*
1736
* This function determines if a network interface is running
1737
*/
1738
__attribute__((nonnull, warn_unused_result))
1739
bool interface_is_running(const char *interface){
1740
struct ifreq ifr;
1741
if(not get_flags(interface, &ifr)){
1742
if(debug){
1743
fprintf_plus(stderr, "Failed to get flags for interface "
1744
"\"%s\"\n", interface);
1745
}
1746
return false;
1747
}
1748
1749
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1750
}
1751
1752
__attribute__((nonnull, pure, warn_unused_result))
1240
1753
int notdotentries(const struct dirent *direntry){
1241
1754
/* Skip "." and ".." */
1242
1755
if(direntry->d_name[0] == '.'
1249
1762
}
1250
1763
1251
1764
/* Is this directory entry a runnable program? */
1765
__attribute__((nonnull, warn_unused_result))
1252
1766
int runnable_hook(const struct dirent *direntry){
1253
1767
int ret;
1254
1768
size_t sret;
1262
1776
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
1777
"abcdefghijklmnopqrstuvwxyz"
1264
1778
"0123456789"
1265
"_-");
1779
"_.-");
1266
1780
if((direntry->d_name)[sret] != '\0'){
1267
1781
/* Contains non-allowed characters */
1268
1782
if(debug){
1272
1786
return 0;
1273
1787
}
1274
1788
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
if(ret < 0){
1278
perror_plus("asprintf");
1279
return 0;
1280
}
1281
1282
ret = stat(fullname, &st);
1789
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1283
1790
if(ret == -1){
1284
1791
if(debug){
1285
1792
perror_plus("Could not stat hook");
1309
1816
return 1;
1310
1817
}
1311
1818
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1819
__attribute__((nonnull, warn_unused_result))
1820
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1821
mandos_context *mc){
1313
1822
int ret;
1314
1823
struct timespec now;
1315
1824
struct timespec waited_time;
1316
1825
intmax_t block_time;
1317
1826
1318
1827
while(true){
1319
if(mc.current_server == NULL){
1320
if (debug){
1828
if(mc->current_server == NULL){
1829
if(debug){
1321
1830
fprintf_plus(stderr, "Wait until first server is found."
1322
1831
" No timeout!\n");
1323
1832
}
1324
1833
ret = avahi_simple_poll_iterate(s, -1);
1325
1834
} else {
1326
if (debug){
1835
if(debug){
1327
1836
fprintf_plus(stderr, "Check current_server if we should run"
1328
1837
" it, or wait\n");
1329
1838
}
1336
1845
/* Calculating in ms how long time between now and server
1337
1846
who we visted longest time ago. Now - last seen. */
1338
1847
waited_time.tv_sec = (now.tv_sec
1339
- mc.current_server->last_seen.tv_sec);
1848
- mc->current_server->last_seen.tv_sec);
1340
1849
waited_time.tv_nsec = (now.tv_nsec
1341
- mc.current_server->last_seen.tv_nsec);
1850
- mc->current_server->last_seen.tv_nsec);
1342
1851
/* total time is 10s/10,000ms.
1343
1852
Converting to s from ms by dividing by 1,000,
1344
1853
and ns to ms by dividing by 1,000,000. */
1346
1855
- ((intmax_t)waited_time.tv_sec * 1000))
1347
1856
- ((intmax_t)waited_time.tv_nsec / 1000000));
1348
1857
1349
if (debug){
1858
if(debug){
1350
1859
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1351
1860
block_time);
1352
1861
}
1353
1862
1354
1863
if(block_time <= 0){
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1864
ret = start_mandos_communication(mc->current_server->ip,
1865
mc->current_server->port,
1866
mc->current_server->if_index,
1867
mc->current_server->af, mc);
1359
1868
if(ret == 0){
1360
avahi_simple_poll_quit(mc.simple_poll);
1869
avahi_simple_poll_quit(s);
1361
1870
return 0;
1362
1871
}
1363
1872
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1873
&mc->current_server->last_seen);
1365
1874
if(ret == -1){
1366
1875
perror_plus("clock_gettime");
1367
1876
return -1;
1368
1877
}
1369
mc.current_server = mc.current_server->next;
1878
mc->current_server = mc->current_server->next;
1370
1879
block_time = 0; /* Call avahi to find new Mandos
1371
1880
servers, but don't block */
1372
1881
}
1374
1883
ret = avahi_simple_poll_iterate(s, (int)block_time);
1375
1884
}
1376
1885
if(ret != 0){
1377
if (ret > 0 or errno != EINTR){
1886
if(ret > 0 or errno != EINTR){
1378
1887
return (ret != 1) ? ret : 0;
1379
1888
}
1380
1889
}
1381
1890
}
1382
1891
}
1383
1892
1384
bool run_network_hooks(const char *mode, const char *interface,
1893
__attribute__((nonnull))
1894
void run_network_hooks(const char *mode, const char *interface,
1385
1895
const float delay){
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
1896
struct dirent **direntries = NULL;
1897
if(hookdir_fd == -1){
1898
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1899
| O_CLOEXEC);
1900
if(hookdir_fd == -1){
1901
if(errno == ENOENT){
1902
if(debug){
1903
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1904
" found\n", hookdir);
1905
}
1906
} else {
1907
perror_plus("open");
1908
}
1909
return;
1910
}
1911
}
1912
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1913
runnable_hook, alphasort);
1391
1914
if(numhooks == -1){
1392
1915
perror_plus("scandir");
1393
} else {
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
if(ret < 0){
1916
return;
1917
}
1918
struct dirent *direntry;
1919
int ret;
1920
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1921
if(devnull == -1){
1922
perror_plus("open(\"/dev/null\", O_RDONLY)");
1923
return;
1924
}
1925
for(int i = 0; i < numhooks; i++){
1926
direntry = direntries[i];
1927
if(debug){
1928
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1929
direntry->d_name);
1930
}
1931
pid_t hook_pid = fork();
1932
if(hook_pid == 0){
1933
/* Child */
1934
/* Raise privileges */
1935
errno = raise_privileges_permanently();
1936
if(errno != 0){
1937
perror_plus("Failed to raise privileges");
1938
_exit(EX_NOPERM);
1939
}
1940
/* Set group */
1941
errno = 0;
1942
ret = setgid(0);
1943
if(ret == -1){
1944
perror_plus("setgid");
1945
_exit(EX_NOPERM);
1946
}
1947
/* Reset supplementary groups */
1948
errno = 0;
1949
ret = setgroups(0, NULL);
1950
if(ret == -1){
1951
perror_plus("setgroups");
1952
_exit(EX_NOPERM);
1953
}
1954
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1955
if(ret == -1){
1956
perror_plus("setenv");
1957
_exit(EX_OSERR);
1958
}
1959
ret = setenv("DEVICE", interface, 1);
1960
if(ret == -1){
1961
perror_plus("setenv");
1962
_exit(EX_OSERR);
1963
}
1964
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1965
if(ret == -1){
1966
perror_plus("setenv");
1967
_exit(EX_OSERR);
1968
}
1969
ret = setenv("MODE", mode, 1);
1970
if(ret == -1){
1971
perror_plus("setenv");
1972
_exit(EX_OSERR);
1973
}
1974
char *delaystring;
1975
ret = asprintf(&delaystring, "%f", (double)delay);
1976
if(ret == -1){
1400
1977
perror_plus("asprintf");
1401
continue;
1402
}
1403
if(debug){
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1405
direntry->d_name);
1406
}
1407
pid_t hook_pid = fork();
1408
if(hook_pid == 0){
1409
/* Child */
1410
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1422
/* Set group */
1423
errno = 0;
1424
ret = setgid(0);
1425
if(ret == -1){
1426
perror_plus("setgid");
1427
}
1428
/* Reset supplementary groups */
1429
errno = 0;
1430
ret = setgroups(0, NULL);
1431
if(ret == -1){
1432
perror_plus("setgroups");
1433
}
1434
dup2(devnull, STDIN_FILENO);
1435
close(devnull);
1436
dup2(STDERR_FILENO, STDOUT_FILENO);
1437
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1438
if(ret == -1){
1439
perror_plus("setenv");
1440
_exit(EX_OSERR);
1441
}
1442
ret = setenv("DEVICE", interface, 1);
1443
if(ret == -1){
1444
perror_plus("setenv");
1445
_exit(EX_OSERR);
1446
}
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1448
if(ret == -1){
1449
perror_plus("setenv");
1450
_exit(EX_OSERR);
1451
}
1452
ret = setenv("MODE", mode, 1);
1453
if(ret == -1){
1454
perror_plus("setenv");
1455
_exit(EX_OSERR);
1456
}
1457
char *delaystring;
1458
ret = asprintf(&delaystring, "%f", delay);
1459
if(ret == -1){
1460
perror_plus("asprintf");
1461
_exit(EX_OSERR);
1462
}
1463
ret = setenv("DELAY", delaystring, 1);
1464
if(ret == -1){
1465
free(delaystring);
1466
perror_plus("setenv");
1467
_exit(EX_OSERR);
1468
}
1978
_exit(EX_OSERR);
1979
}
1980
ret = setenv("DELAY", delaystring, 1);
1981
if(ret == -1){
1469
1982
free(delaystring);
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1472
} else {
1473
int status;
1474
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1475
perror_plus("waitpid");
1476
free(fullname);
1477
continue;
1478
}
1479
if(WIFEXITED(status)){
1480
if(WEXITSTATUS(status) != 0){
1481
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1482
" with status %d\n", direntry->d_name,
1483
WEXITSTATUS(status));
1484
free(fullname);
1485
continue;
1486
}
1487
} else if(WIFSIGNALED(status)){
1488
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1489
" signal %d\n", direntry->d_name,
1490
WTERMSIG(status));
1491
free(fullname);
1492
continue;
1493
} else {
1494
fprintf_plus(stderr, "Warning: network hook \"%s\""
1495
" crashed\n", direntry->d_name);
1496
free(fullname);
1497
continue;
1498
}
1499
}
1500
free(fullname);
1501
if(debug){
1502
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1503
direntry->d_name);
1504
}
1505
}
1506
close(devnull);
1507
}
1508
return true;
1983
perror_plus("setenv");
1984
_exit(EX_OSERR);
1985
}
1986
free(delaystring);
1987
if(connect_to != NULL){
1988
ret = setenv("CONNECT", connect_to, 1);
1989
if(ret == -1){
1990
perror_plus("setenv");
1991
_exit(EX_OSERR);
1992
}
1993
}
1994
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1995
direntry->d_name,
1996
O_RDONLY));
1997
if(hook_fd == -1){
1998
perror_plus("openat");
1999
_exit(EXIT_FAILURE);
2000
}
2001
if(close(hookdir_fd) == -1){
2002
perror_plus("close");
2003
_exit(EXIT_FAILURE);
2004
}
2005
ret = dup2(devnull, STDIN_FILENO);
2006
if(ret == -1){
2007
perror_plus("dup2(devnull, STDIN_FILENO)");
2008
_exit(EX_OSERR);
2009
}
2010
ret = close(devnull);
2011
if(ret == -1){
2012
perror_plus("close");
2013
_exit(EX_OSERR);
2014
}
2015
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2016
if(ret == -1){
2017
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2018
_exit(EX_OSERR);
2019
}
2020
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2021
environ) == -1){
2022
perror_plus("fexecve");
2023
_exit(EXIT_FAILURE);
2024
}
2025
} else {
2026
if(hook_pid == -1){
2027
perror_plus("fork");
2028
free(direntry);
2029
continue;
2030
}
2031
int status;
2032
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2033
perror_plus("waitpid");
2034
free(direntry);
2035
continue;
2036
}
2037
if(WIFEXITED(status)){
2038
if(WEXITSTATUS(status) != 0){
2039
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2040
" with status %d\n", direntry->d_name,
2041
WEXITSTATUS(status));
2042
free(direntry);
2043
continue;
2044
}
2045
} else if(WIFSIGNALED(status)){
2046
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2047
" signal %d\n", direntry->d_name,
2048
WTERMSIG(status));
2049
free(direntry);
2050
continue;
2051
} else {
2052
fprintf_plus(stderr, "Warning: network hook \"%s\""
2053
" crashed\n", direntry->d_name);
2054
free(direntry);
2055
continue;
2056
}
2057
}
2058
if(debug){
2059
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2060
direntry->d_name);
2061
}
2062
free(direntry);
2063
}
2064
free(direntries);
2065
if(close(hookdir_fd) == -1){
2066
perror_plus("close");
2067
} else {
2068
hookdir_fd = -1;
2069
}
2070
close(devnull);
2071
}
2072
2073
__attribute__((nonnull, warn_unused_result))
2074
error_t bring_up_interface(const char *const interface,
2075
const float delay){
2076
error_t old_errno = errno;
2077
int ret;
2078
struct ifreq network;
2079
unsigned int if_index = if_nametoindex(interface);
2080
if(if_index == 0){
2081
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2082
errno = old_errno;
2083
return ENXIO;
2084
}
2085
2086
if(quit_now){
2087
errno = old_errno;
2088
return EINTR;
2089
}
2090
2091
if(not interface_is_up(interface)){
2092
error_t ret_errno = 0, ioctl_errno = 0;
2093
if(not get_flags(interface, &network)){
2094
ret_errno = errno;
2095
fprintf_plus(stderr, "Failed to get flags for interface "
2096
"\"%s\"\n", interface);
2097
errno = old_errno;
2098
return ret_errno;
2099
}
2100
network.ifr_flags |= IFF_UP; /* set flag */
2101
2102
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2103
if(sd == -1){
2104
ret_errno = errno;
2105
perror_plus("socket");
2106
errno = old_errno;
2107
return ret_errno;
2108
}
2109
2110
if(quit_now){
2111
ret = close(sd);
2112
if(ret == -1){
2113
perror_plus("close");
2114
}
2115
errno = old_errno;
2116
return EINTR;
2117
}
2118
2119
if(debug){
2120
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2121
interface);
2122
}
2123
2124
/* Raise privileges */
2125
ret_errno = raise_privileges();
2126
if(ret_errno != 0){
2127
errno = ret_errno;
2128
perror_plus("Failed to raise privileges");
2129
}
2130
2131
#ifdef __linux__
2132
int ret_linux;
2133
bool restore_loglevel = false;
2134
if(ret_errno == 0){
2135
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2136
messages about the network interface to mess up the prompt */
2137
ret_linux = klogctl(8, NULL, 5);
2138
if(ret_linux == -1){
2139
perror_plus("klogctl");
2140
} else {
2141
restore_loglevel = true;
2142
}
2143
}
2144
#endif /* __linux__ */
2145
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2146
ioctl_errno = errno;
2147
#ifdef __linux__
2148
if(restore_loglevel){
2149
ret_linux = klogctl(7, NULL, 0);
2150
if(ret_linux == -1){
2151
perror_plus("klogctl");
2152
}
2153
}
2154
#endif /* __linux__ */
2155
2156
/* If raise_privileges() succeeded above */
2157
if(ret_errno == 0){
2158
/* Lower privileges */
2159
ret_errno = lower_privileges();
2160
if(ret_errno != 0){
2161
errno = ret_errno;
2162
perror_plus("Failed to lower privileges");
2163
}
2164
}
2165
2166
/* Close the socket */
2167
ret = close(sd);
2168
if(ret == -1){
2169
perror_plus("close");
2170
}
2171
2172
if(ret_setflags == -1){
2173
errno = ioctl_errno;
2174
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2175
errno = old_errno;
2176
return ioctl_errno;
2177
}
2178
} else if(debug){
2179
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2180
interface);
2181
}
2182
2183
/* Sleep checking until interface is running.
2184
Check every 0.25s, up to total time of delay */
2185
for(int i=0; i < delay * 4; i++){
2186
if(interface_is_running(interface)){
2187
break;
2188
}
2189
struct timespec sleeptime = { .tv_nsec = 250000000 };
2190
ret = nanosleep(&sleeptime, NULL);
2191
if(ret == -1 and errno != EINTR){
2192
perror_plus("nanosleep");
2193
}
2194
}
2195
2196
errno = old_errno;
2197
return 0;
2198
}
2199
2200
__attribute__((nonnull, warn_unused_result))
2201
error_t take_down_interface(const char *const interface){
2202
error_t old_errno = errno;
2203
struct ifreq network;
2204
unsigned int if_index = if_nametoindex(interface);
2205
if(if_index == 0){
2206
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2207
errno = old_errno;
2208
return ENXIO;
2209
}
2210
if(interface_is_up(interface)){
2211
error_t ret_errno = 0, ioctl_errno = 0;
2212
if(not get_flags(interface, &network) and debug){
2213
ret_errno = errno;
2214
fprintf_plus(stderr, "Failed to get flags for interface "
2215
"\"%s\"\n", interface);
2216
errno = old_errno;
2217
return ret_errno;
2218
}
2219
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2220
2221
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2222
if(sd == -1){
2223
ret_errno = errno;
2224
perror_plus("socket");
2225
errno = old_errno;
2226
return ret_errno;
2227
}
2228
2229
if(debug){
2230
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2231
interface);
2232
}
2233
2234
/* Raise privileges */
2235
ret_errno = raise_privileges();
2236
if(ret_errno != 0){
2237
errno = ret_errno;
2238
perror_plus("Failed to raise privileges");
2239
}
2240
2241
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2242
ioctl_errno = errno;
2243
2244
/* If raise_privileges() succeeded above */
2245
if(ret_errno == 0){
2246
/* Lower privileges */
2247
ret_errno = lower_privileges();
2248
if(ret_errno != 0){
2249
errno = ret_errno;
2250
perror_plus("Failed to lower privileges");
2251
}
2252
}
2253
2254
/* Close the socket */
2255
int ret = close(sd);
2256
if(ret == -1){
2257
perror_plus("close");
2258
}
2259
2260
if(ret_setflags == -1){
2261
errno = ioctl_errno;
2262
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2263
errno = old_errno;
2264
return ioctl_errno;
2265
}
2266
} else if(debug){
2267
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2268
interface);
2269
}
2270
2271
errno = old_errno;
2272
return 0;
1509
2273
}
1510
2274
1511
2275
int main(int argc, char *argv[]){
2276
mandos_context mc = { .server = NULL, .dh_bits = 0,
2277
.priority = "SECURE256:!CTYPE-X.509"
2278
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2279
.current_server = NULL, .interfaces = NULL,
2280
.interfaces_size = 0 };
1512
2281
AvahiSServiceBrowser *sb = NULL;
1513
int error;
2282
error_t ret_errno;
1514
2283
int ret;
1515
2284
intmax_t tmpmax;
1516
2285
char *tmp;
1517
2286
int exitcode = EXIT_SUCCESS;
1518
const char *interface = "";
1519
struct ifreq network;
1520
int sd = -1;
1521
bool take_down_interface = false;
1522
uid_t uid;
1523
gid_t gid;
1524
char tempdir[] = "/tmp/mandosXXXXXX";
1525
bool tempdir_created = false;
2287
char *interfaces_to_take_down = NULL;
2288
size_t interfaces_to_take_down_size = 0;
2289
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2290
char old_tempdir[] = "/tmp/mandosXXXXXX";
2291
char *tempdir = NULL;
1526
2292
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1527
2293
const char *seckey = PATHDIR "/" SECKEY;
1528
2294
const char *pubkey = PATHDIR "/" PUBKEY;
2295
const char *dh_params_file = NULL;
2296
char *interfaces_hooks = NULL;
1529
2297
1530
2298
bool gnutls_initialized = false;
1531
2299
bool gpgme_initialized = false;
1583
2351
.doc = "Bit length of the prime number used in the"
1584
2352
" Diffie-Hellman key exchange",
1585
2353
.group = 2 },
2354
{ .name = "dh-params", .key = 134,
2355
.arg = "FILE",
2356
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2357
" for the Diffie-Hellman key exchange",
2358
.group = 2 },
1586
2359
{ .name = "priority", .key = 130,
1587
2360
.arg = "STRING",
1588
2361
.doc = "GnuTLS priority string for the TLS handshake",
1593
2366
.group = 2 },
1594
2367
{ .name = "retry", .key = 132,
1595
2368
.arg = "SECONDS",
1596
.doc = "Retry interval used when denied by the mandos server",
2369
.doc = "Retry interval used when denied by the Mandos server",
1597
2370
.group = 2 },
1598
2371
{ .name = "network-hook-dir", .key = 133,
1599
2372
.arg = "DIR",
1622
2395
connect_to = arg;
1623
2396
break;
1624
2397
case 'i': /* --interface */
1625
interface = arg;
2398
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2399
arg, (int)',');
2400
if(ret_errno != 0){
2401
argp_error(state, "%s", strerror(ret_errno));
2402
}
1626
2403
break;
1627
2404
case 's': /* --seckey */
1628
2405
seckey = arg;
1639
2416
}
1640
2417
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1641
2418
break;
2419
case 134: /* --dh-params */
2420
dh_params_file = arg;
2421
break;
1642
2422
case 130: /* --priority */
1643
2423
mc.priority = arg;
1644
2424
break;
1671
2451
argp_state_help(state, state->out_stream,
1672
2452
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1673
2453
case 'V': /* --version */
1674
fprintf_plus(state->out_stream,
1675
"Mandos plugin mandos-client: ");
1676
2454
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1677
2455
exit(argp_err_exit_status);
1678
2456
break;
1702
2480
goto end;
1703
2481
}
1704
2482
}
1705
2483
1706
2484
{
1707
2485
/* Work around Debian bug #633582:
1708
2486
<http://bugs.debian.org/633582> */
1709
2487
1710
/* Re-raise priviliges */
1711
errno = 0;
1712
ret = seteuid(0);
1713
if(ret == -1){
1714
perror_plus("seteuid");
2488
/* Re-raise privileges */
2489
ret_errno = raise_privileges();
2490
if(ret_errno != 0){
2491
errno = ret_errno;
2492
perror_plus("Failed to raise privileges");
1715
2493
} else {
1716
2494
struct stat st;
1717
2495
1732
2510
}
1733
2511
}
1734
2512
}
1735
TEMP_FAILURE_RETRY(close(seckey_fd));
2513
close(seckey_fd);
1736
2514
}
1737
2515
}
1738
2516
1739
2517
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1740
2518
int pubkey_fd = open(pubkey, O_RDONLY);
1741
2519
if(pubkey_fd == -1){
1753
2531
}
1754
2532
}
1755
2533
}
1756
TEMP_FAILURE_RETRY(close(pubkey_fd));
1757
}
1758
}
1759
2534
close(pubkey_fd);
2535
}
2536
}
2537
2538
if(dh_params_file != NULL
2539
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2540
int dhparams_fd = open(dh_params_file, O_RDONLY);
2541
if(dhparams_fd == -1){
2542
perror_plus("open");
2543
} else {
2544
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2545
if(ret == -1){
2546
perror_plus("fstat");
2547
} else {
2548
if(S_ISREG(st.st_mode)
2549
and st.st_uid == 0 and st.st_gid == 0){
2550
ret = fchown(dhparams_fd, uid, gid);
2551
if(ret == -1){
2552
perror_plus("fchown");
2553
}
2554
}
2555
}
2556
close(dhparams_fd);
2557
}
2558
}
2559
1760
2560
/* Lower privileges */
1761
errno = 0;
1762
ret = seteuid(uid);
1763
if(ret == -1){
1764
perror_plus("seteuid");
2561
ret_errno = lower_privileges();
2562
if(ret_errno != 0){
2563
errno = ret_errno;
2564
perror_plus("Failed to lower privileges");
2565
}
2566
}
2567
}
2568
2569
/* Remove invalid interface names (except "none") */
2570
{
2571
char *interface = NULL;
2572
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2573
interface))){
2574
if(strcmp(interface, "none") != 0
2575
and if_nametoindex(interface) == 0){
2576
if(interface[0] != '\0'){
2577
fprintf_plus(stderr, "Not using nonexisting interface"
2578
" \"%s\"\n", interface);
2579
}
2580
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2581
interface = NULL;
1765
2582
}
1766
2583
}
1767
2584
}
1768
2585
1769
2586
/* Run network hooks */
1770
if(not run_network_hooks("start", interface, delay)){
1771
goto end;
2587
{
2588
if(mc.interfaces != NULL){
2589
interfaces_hooks = malloc(mc.interfaces_size);
2590
if(interfaces_hooks == NULL){
2591
perror_plus("malloc");
2592
goto end;
2593
}
2594
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2595
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2596
}
2597
run_network_hooks("start", interfaces_hooks != NULL ?
2598
interfaces_hooks : "", delay);
1772
2599
}
1773
2600
1774
2601
if(not debug){
1775
2602
avahi_set_log_function(empty_log);
1776
2603
}
1777
2604
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
if(ret >= 1){
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1792
if(debug){
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1794
}
1795
if(interface == NULL){
1796
perror_plus("malloc");
1797
free(direntries);
1798
exitcode = EXIT_FAILURE;
1799
goto end;
1800
}
1801
free(direntries);
1802
} else {
1803
free(direntries);
1804
fprintf_plus(stderr, "Could not find a network interface\n");
1805
exitcode = EXIT_FAILURE;
1806
goto end;
1807
}
1808
}
1809
1810
2605
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1811
2606
from the signal handler */
1812
2607
/* Initialize the pseudo-RNG for Avahi */
1813
2608
srand((unsigned int) time(NULL));
1814
mc.simple_poll = avahi_simple_poll_new();
1815
if(mc.simple_poll == NULL){
2609
simple_poll = avahi_simple_poll_new();
2610
if(simple_poll == NULL){
1816
2611
fprintf_plus(stderr,
1817
2612
"Avahi: Failed to create simple poll object.\n");
1818
2613
exitcode = EX_UNAVAILABLE;
1882
2677
}
1883
2678
}
1884
2679
1885
/* If the interface is down, bring it up */
1886
if(strcmp(interface, "none") != 0){
1887
if_index = (AvahiIfIndex) if_nametoindex(interface);
1888
if(if_index == 0){
1889
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1890
exitcode = EX_UNAVAILABLE;
1891
goto end;
1892
}
1893
1894
if(quit_now){
1895
goto end;
1896
}
1897
1898
/* Re-raise priviliges */
1899
errno = 0;
1900
ret = seteuid(0);
1901
if(ret == -1){
1902
perror_plus("seteuid");
1903
}
1904
1905
#ifdef __linux__
1906
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1907
messages about the network interface to mess up the prompt */
1908
ret = klogctl(8, NULL, 5);
1909
bool restore_loglevel = true;
1910
if(ret == -1){
1911
restore_loglevel = false;
1912
perror_plus("klogctl");
1913
}
1914
#endif /* __linux__ */
1915
1916
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1917
if(sd < 0){
1918
perror_plus("socket");
1919
exitcode = EX_OSERR;
1920
#ifdef __linux__
1921
if(restore_loglevel){
1922
ret = klogctl(7, NULL, 0);
1923
if(ret == -1){
1924
perror_plus("klogctl");
1925
}
1926
}
1927
#endif /* __linux__ */
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1934
goto end;
1935
}
1936
strcpy(network.ifr_name, interface);
1937
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1938
if(ret == -1){
1939
perror_plus("ioctl SIOCGIFFLAGS");
1940
#ifdef __linux__
1941
if(restore_loglevel){
1942
ret = klogctl(7, NULL, 0);
1943
if(ret == -1){
1944
perror_plus("klogctl");
1945
}
1946
}
1947
#endif /* __linux__ */
1948
exitcode = EX_OSERR;
1949
/* Lower privileges */
1950
errno = 0;
1951
ret = seteuid(uid);
1952
if(ret == -1){
1953
perror_plus("seteuid");
1954
}
1955
goto end;
1956
}
1957
if((network.ifr_flags & IFF_UP) == 0){
1958
network.ifr_flags |= IFF_UP;
1959
take_down_interface = true;
1960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1961
if(ret == -1){
1962
take_down_interface = false;
1963
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1964
exitcode = EX_OSERR;
1965
#ifdef __linux__
1966
if(restore_loglevel){
1967
ret = klogctl(7, NULL, 0);
1968
if(ret == -1){
1969
perror_plus("klogctl");
2680
/* If no interfaces were specified, make a list */
2681
if(mc.interfaces == NULL){
2682
struct dirent **direntries = NULL;
2683
/* Look for any good interfaces */
2684
ret = scandir(sys_class_net, &direntries, good_interface,
2685
alphasort);
2686
if(ret >= 1){
2687
/* Add all found interfaces to interfaces list */
2688
for(int i = 0; i < ret; ++i){
2689
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2690
direntries[i]->d_name);
2691
if(ret_errno != 0){
2692
errno = ret_errno;
2693
perror_plus("argz_add");
2694
free(direntries[i]);
2695
continue;
2696
}
2697
if(debug){
2698
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2699
direntries[i]->d_name);
2700
}
2701
free(direntries[i]);
2702
}
2703
free(direntries);
2704
} else {
2705
if(ret == 0){
2706
free(direntries);
2707
}
2708
fprintf_plus(stderr, "Could not find a network interface\n");
2709
exitcode = EXIT_FAILURE;
2710
goto end;
2711
}
2712
}
2713
2714
/* Bring up interfaces which are down, and remove any "none"s */
2715
{
2716
char *interface = NULL;
2717
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2718
interface))){
2719
/* If interface name is "none", stop bringing up interfaces.
2720
Also remove all instances of "none" from the list */
2721
if(strcmp(interface, "none") == 0){
2722
argz_delete(&mc.interfaces, &mc.interfaces_size,
2723
interface);
2724
interface = NULL;
2725
while((interface = argz_next(mc.interfaces,
2726
mc.interfaces_size, interface))){
2727
if(strcmp(interface, "none") == 0){
2728
argz_delete(&mc.interfaces, &mc.interfaces_size,
2729
interface);
2730
interface = NULL;
1970
2731
}
1971
2732
}
1972
#endif /* __linux__ */
1973
/* Lower privileges */
1974
errno = 0;
1975
ret = seteuid(uid);
1976
if(ret == -1){
1977
perror_plus("seteuid");
1978
}
1979
goto end;
1980
}
1981
}
1982
/* Sleep checking until interface is running.
1983
Check every 0.25s, up to total time of delay */
1984
for(int i=0; i < delay * 4; i++){
1985
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1986
if(ret == -1){
1987
perror_plus("ioctl SIOCGIFFLAGS");
1988
} else if(network.ifr_flags & IFF_RUNNING){
1989
2733
break;
1990
2734
}
1991
struct timespec sleeptime = { .tv_nsec = 250000000 };
1992
ret = nanosleep(&sleeptime, NULL);
1993
if(ret == -1 and errno != EINTR){
1994
perror_plus("nanosleep");
1995
}
1996
}
1997
if(not take_down_interface){
1998
/* We won't need the socket anymore */
1999
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2000
if(ret == -1){
2001
perror_plus("close");
2002
}
2003
}
2004
#ifdef __linux__
2005
if(restore_loglevel){
2006
/* Restores kernel loglevel to default */
2007
ret = klogctl(7, NULL, 0);
2008
if(ret == -1){
2009
perror_plus("klogctl");
2010
}
2011
}
2012
#endif /* __linux__ */
2013
/* Lower privileges */
2014
errno = 0;
2015
/* Lower privileges */
2016
ret = seteuid(uid);
2017
if(ret == -1){
2018
perror_plus("seteuid");
2019
}
2735
bool interface_was_up = interface_is_up(interface);
2736
errno = bring_up_interface(interface, delay);
2737
if(not interface_was_up){
2738
if(errno != 0){
2739
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2740
" %s\n", interface, strerror(errno));
2741
} else {
2742
errno = argz_add(&interfaces_to_take_down,
2743
&interfaces_to_take_down_size,
2744
interface);
2745
if(errno != 0){
2746
perror_plus("argz_add");
2747
}
2748
}
2749
}
2750
}
2751
if(debug and (interfaces_to_take_down == NULL)){
2752
fprintf_plus(stderr, "No interfaces were brought up\n");
2753
}
2754
}
2755
2756
/* If we only got one interface, explicitly use only that one */
2757
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2758
if(debug){
2759
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2760
mc.interfaces);
2761
}
2762
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2020
2763
}
2021
2764
2022
2765
if(quit_now){
2023
2766
goto end;
2024
2767
}
2025
2768
2026
ret = init_gnutls_global(pubkey, seckey);
2769
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2027
2770
if(ret == -1){
2028
2771
fprintf_plus(stderr, "init_gnutls_global failed\n");
2029
2772
exitcode = EX_UNAVAILABLE;
2036
2779
goto end;
2037
2780
}
2038
2781
2039
if(mkdtemp(tempdir) == NULL){
2782
/* Try /run/tmp before /tmp */
2783
tempdir = mkdtemp(run_tempdir);
2784
if(tempdir == NULL and errno == ENOENT){
2785
if(debug){
2786
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2787
run_tempdir, old_tempdir);
2788
}
2789
tempdir = mkdtemp(old_tempdir);
2790
}
2791
if(tempdir == NULL){
2040
2792
perror_plus("mkdtemp");
2041
2793
goto end;
2042
2794
}
2043
tempdir_created = true;
2044
2795
2045
2796
if(quit_now){
2046
2797
goto end;
2047
2798
}
2048
2799
2049
if(not init_gpgme(pubkey, seckey, tempdir)){
2800
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2050
2801
fprintf_plus(stderr, "init_gpgme failed\n");
2051
2802
exitcode = EX_UNAVAILABLE;
2052
2803
goto end;
2062
2813
/* Connect directly, do not use Zeroconf */
2063
2814
/* (Mainly meant for debugging) */
2064
2815
char *address = strrchr(connect_to, ':');
2816
2065
2817
if(address == NULL){
2066
2818
fprintf_plus(stderr, "No colon in address\n");
2067
2819
exitcode = EX_USAGE;
2072
2824
goto end;
2073
2825
}
2074
2826
2075
uint16_t port;
2827
in_port_t port;
2076
2828
errno = 0;
2077
2829
tmpmax = strtoimax(address+1, &tmp, 10);
2078
2830
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2079
or tmpmax != (uint16_t)tmpmax){
2831
or tmpmax != (in_port_t)tmpmax){
2080
2832
fprintf_plus(stderr, "Bad port number\n");
2081
2833
exitcode = EX_USAGE;
2082
2834
goto end;
2083
2835
}
2084
2836
2085
2837
if(quit_now){
2086
2838
goto end;
2087
2839
}
2088
2840
2089
port = (uint16_t)tmpmax;
2841
port = (in_port_t)tmpmax;
2090
2842
*address = '\0';
2091
2843
/* Colon in address indicates IPv6 */
2092
2844
int af;
2108
2860
}
2109
2861
2110
2862
while(not quit_now){
2111
ret = start_mandos_communication(address, port, if_index, af);
2863
ret = start_mandos_communication(address, port, if_index, af,
2864
&mc);
2112
2865
if(quit_now or ret == 0){
2113
2866
break;
2114
2867
}
2116
2869
fprintf_plus(stderr, "Retrying in %d seconds\n",
2117
2870
(int)retry_interval);
2118
2871
}
2119
sleep((int)retry_interval);
2872
sleep((unsigned int)retry_interval);
2120
2873
}
2121
2874
2122
if (not quit_now){
2875
if(not quit_now){
2123
2876
exitcode = EXIT_SUCCESS;
2124
2877
}
2125
2878
2140
2893
config.publish_domain = 0;
2141
2894
2142
2895
/* Allocate a new server */
2143
mc.server = avahi_server_new(avahi_simple_poll_get
2144
(mc.simple_poll), &config, NULL,
2145
NULL, &error);
2896
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2897
&config, NULL, NULL, &ret_errno);
2146
2898
2147
2899
/* Free the Avahi configuration data */
2148
2900
avahi_server_config_free(&config);
2151
2903
/* Check if creating the Avahi server object succeeded */
2152
2904
if(mc.server == NULL){
2153
2905
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2154
avahi_strerror(error));
2906
avahi_strerror(ret_errno));
2155
2907
exitcode = EX_UNAVAILABLE;
2156
2908
goto end;
2157
2909
}
2163
2915
/* Create the Avahi service browser */
2164
2916
sb = avahi_s_service_browser_new(mc.server, if_index,
2165
2917
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2166
NULL, 0, browse_callback, NULL);
2918
NULL, 0, browse_callback,
2919
(void *)&mc);
2167
2920
if(sb == NULL){
2168
2921
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2169
2922
avahi_strerror(avahi_server_errno(mc.server)));
2180
2933
if(debug){
2181
2934
fprintf_plus(stderr, "Starting Avahi loop search\n");
2182
2935
}
2183
2184
ret = avahi_loop_with_timeout(mc.simple_poll,
2185
(int)(retry_interval * 1000));
2936
2937
ret = avahi_loop_with_timeout(simple_poll,
2938
(int)(retry_interval * 1000), &mc);
2186
2939
if(debug){
2187
2940
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2188
2941
(ret == 0) ? "successfully" : "with error");
2195
2948
}
2196
2949
2197
2950
/* Cleanup things */
2951
free(mc.interfaces);
2952
2198
2953
if(sb != NULL)
2199
2954
avahi_s_service_browser_free(sb);
2200
2955
2201
2956
if(mc.server != NULL)
2202
2957
avahi_server_free(mc.server);
2203
2958
2204
if(mc.simple_poll != NULL)
2205
avahi_simple_poll_free(mc.simple_poll);
2959
if(simple_poll != NULL)
2960
avahi_simple_poll_free(simple_poll);
2206
2961
2207
2962
if(gnutls_initialized){
2208
2963
gnutls_certificate_free_credentials(mc.cred);
2209
gnutls_global_deinit();
2210
2964
gnutls_dh_params_deinit(mc.dh_params);
2211
2965
}
2212
2966
2220
2974
mc.current_server->prev->next = NULL;
2221
2975
while(mc.current_server != NULL){
2222
2976
server *next = mc.current_server->next;
2977
#ifdef __GNUC__
2978
#pragma GCC diagnostic push
2979
#pragma GCC diagnostic ignored "-Wcast-qual"
2980
#endif
2981
free((char *)(mc.current_server->ip));
2982
#ifdef __GNUC__
2983
#pragma GCC diagnostic pop
2984
#endif
2223
2985
free(mc.current_server);
2224
2986
mc.current_server = next;
2225
2987
}
2226
2988
}
2227
2989
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2230
2231
/* Re-raise priviliges */
2990
/* Re-raise privileges */
2232
2991
{
2233
errno = 0;
2234
ret = seteuid(0);
2235
if(ret == -1){
2236
perror_plus("seteuid");
2992
ret_errno = raise_privileges();
2993
if(ret_errno != 0){
2994
errno = ret_errno;
2995
perror_plus("Failed to raise privileges");
2996
} else {
2997
2998
/* Run network hooks */
2999
run_network_hooks("stop", interfaces_hooks != NULL ?
3000
interfaces_hooks : "", delay);
3001
3002
/* Take down the network interfaces which were brought up */
3003
{
3004
char *interface = NULL;
3005
while((interface=argz_next(interfaces_to_take_down,
3006
interfaces_to_take_down_size,
3007
interface))){
3008
ret_errno = take_down_interface(interface);
3009
if(ret_errno != 0){
3010
errno = ret_errno;
3011
perror_plus("Failed to take down interface");
3012
}
3013
}
3014
if(debug and (interfaces_to_take_down == NULL)){
3015
fprintf_plus(stderr, "No interfaces needed to be taken"
3016
" down\n");
3017
}
3018
}
2237
3019
}
2238
3020
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
2241
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2242
if(ret == -1){
2243
perror_plus("ioctl SIOCGIFFLAGS");
2244
} else if(network.ifr_flags & IFF_UP){
2245
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2246
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2247
if(ret == -1){
2248
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2249
}
2250
}
2251
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2252
if(ret == -1){
2253
perror_plus("close");
2254
}
3021
ret_errno = lower_privileges_permanently();
3022
if(ret_errno != 0){
3023
errno = ret_errno;
3024
perror_plus("Failed to lower privileges permanently");
2255
3025
}
2256
3026
}
2257
/* Lower privileges permanently */
2258
errno = 0;
2259
ret = setuid(uid);
2260
if(ret == -1){
2261
perror_plus("setuid");
3027
3028
free(interfaces_to_take_down);
3029
free(interfaces_hooks);
3030
3031
void clean_dir_at(int base, const char * const dirname,
3032
uintmax_t level){
3033
struct dirent **direntries = NULL;
3034
int dret;
3035
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3036
O_RDONLY
3037
| O_NOFOLLOW
3038
| O_DIRECTORY
3039
| O_PATH));
3040
if(dir_fd == -1){
3041
perror_plus("open");
3042
}
3043
int numentries = scandirat(dir_fd, ".", &direntries,
3044
notdotentries, alphasort);
3045
if(numentries >= 0){
3046
for(int i = 0; i < numentries; i++){
3047
if(debug){
3048
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3049
dirname, direntries[i]->d_name);
3050
}
3051
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3052
if(dret == -1){
3053
if(errno == EISDIR){
3054
dret = unlinkat(dir_fd, direntries[i]->d_name,
3055
AT_REMOVEDIR);
3056
}
3057
if((dret == -1) and (errno == ENOTEMPTY)
3058
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3059
== 0) and (level == 0)){
3060
/* Recurse only in this special case */
3061
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3062
dret = 0;
3063
}
3064
if(dret == -1){
3065
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3066
direntries[i]->d_name, strerror(errno));
3067
}
3068
}
3069
free(direntries[i]);
3070
}
3071
3072
/* need to clean even if 0 because man page doesn't specify */
3073
free(direntries);
3074
if(numentries == -1){
3075
perror_plus("scandirat");
3076
}
3077
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3078
if(dret == -1 and errno != ENOENT){
3079
perror_plus("rmdir");
3080
}
3081
} else {
3082
perror_plus("scandirat");
3083
}
3084
close(dir_fd);
2262
3085
}
2263
3086
2264
3087
/* Removes the GPGME temp directory and all files inside */
2265
if(tempdir_created){
2266
struct dirent **direntries = NULL;
2267
struct dirent *direntry = NULL;
2268
int numentries = scandir(tempdir, &direntries, notdotentries,
2269
alphasort);
2270
if (numentries > 0){
2271
for(int i = 0; i < numentries; i++){
2272
direntry = direntries[i];
2273
char *fullname = NULL;
2274
ret = asprintf(&fullname, "%s/%s", tempdir,
2275
direntry->d_name);
2276
if(ret < 0){
2277
perror_plus("asprintf");
2278
continue;
2279
}
2280
ret = remove(fullname);
2281
if(ret == -1){
2282
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2283
strerror(errno));
2284
}
2285
free(fullname);
2286
}
2287
}
2288
2289
/* need to clean even if 0 because man page doesn't specify */
2290
free(direntries);
2291
if (numentries == -1){
2292
perror_plus("scandir");
2293
}
2294
ret = rmdir(tempdir);
2295
if(ret == -1 and errno != ENOENT){
2296
perror_plus("rmdir");
2297
}
3088
if(tempdir != NULL){
3089
clean_dir_at(-1, tempdir, 0);
2298
3090
}
2299
3091
2300
3092
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0