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- Committer: Teddy Hogeborn
- Date: 2016-02-28 03:01:43 UTC
- Revision ID: teddy@recompile.se-20160228030143-i6w90r7wzkvlx9kq
Stop using python-gnutls. Use GnuTLS 3.3 or later directly.
* INSTALL: Document dependency on GnuTLS 3.3 and remove dependency on
Python-GnuTLS.
* debian/control (Source: mandos/Build-Depends): Add (>= 3.3.0) to
"libgnutls28-dev" and
"gnutls-dev".
(Source: mandos/Build-Depends-Indep): Remove "python2.7-gnutls".
(Package: mandos/Depends): Remove "python-gnutls" and
"python2.7-gnutls", add "libgnutls28-dev
(>= 3.3.0) | libgnutls30 (>= 3.3.0)"
* mandos: Remove imports of "gnutls" and all submodules.
(GnuTLS, gnutls): New; simulate a "gnutls" module. Change all
callers to match new shorter names.
* INSTALL: Document dependency on GnuTLS 3.3 and remove dependency on
Python-GnuTLS.
* debian/control (Source: mandos/Build-Depends): Add (>= 3.3.0) to
"libgnutls28-dev" and
"gnutls-dev".
(Source: mandos/Build-Depends-Indep): Remove "python2.7-gnutls".
(Package: mandos/Depends): Remove "python-gnutls" and
"python2.7-gnutls", add "libgnutls28-dev
(>= 3.3.0) | libgnutls30 (>= 3.3.0)"
* mandos: Remove imports of "gnutls" and all submodules.
(GnuTLS, gnutls): New; simulate a "gnutls" module. Change all
callers to match new shorter names.
- 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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 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() */
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
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
78
79
#include <iso646.h> /* not, or, and */
79
80
#include <argp.h> /* struct argp_option, error_t, struct
80
81
argp_state, struct argp,
88
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
90
WEXITSTATUS(), WTERMSIG() */
90
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
91
98
92
99
#ifdef __linux__
93
100
#include <sys/klog.h> /* klogctl() */
135
142
static const char sys_class_net[] = "/sys/class/net";
136
143
char *connect_to = NULL;
137
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
138
148
139
149
/* Doubly linked list that need to be circularly linked when used */
140
150
typedef struct server{
141
151
const char *ip;
142
uint16_t port;
152
in_port_t port;
143
153
AvahiIfIndex if_index;
144
154
int af;
145
155
struct timespec last_seen;
149
159
150
160
/* Used for passing in values through the Avahi callback functions */
151
161
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
162
AvahiServer *server;
154
163
gnutls_certificate_credentials_t cred;
155
164
unsigned int dh_bits;
157
166
const char *priority;
158
167
gpgme_ctx_t ctx;
159
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
160
171
} mandos_context;
161
172
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 };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
167
175
168
176
sig_atomic_t quit_now = 0;
169
177
int signal_received = 0;
177
185
perror(print_text);
178
186
}
179
187
180
__attribute__((format (gnu_printf, 2, 3)))
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
181
189
int fprintf_plus(FILE *stream, const char *format, ...){
182
190
va_list ap;
183
191
va_start (ap, format);
184
192
185
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
194
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
196
}
189
197
190
198
/*
192
200
* bytes. "buffer_capacity" is how much is currently allocated,
193
201
* "buffer_length" is how much is already used.
194
202
*/
203
__attribute__((nonnull, warn_unused_result))
195
204
size_t incbuffer(char **buffer, size_t buffer_length,
196
205
size_t buffer_capacity){
197
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
200
213
return 0;
201
214
}
215
*buffer = new_buf;
202
216
buffer_capacity += BUFFER_SIZE;
203
217
}
204
218
return buffer_capacity;
205
219
}
206
220
207
221
/* 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){
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
210
225
int ret;
211
226
server *new_server = malloc(sizeof(server));
212
227
if(new_server == NULL){
219
234
.af = af };
220
235
if(new_server->ip == NULL){
221
236
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
222
252
return false;
223
253
}
224
254
/* Special case of first server */
225
if (mc.current_server == NULL){
255
if(*current_server == NULL){
226
256
new_server->next = new_server;
227
257
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
258
*current_server = new_server;
230
259
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
233
263
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;
264
(*current_server)->prev = new_server;
240
265
}
241
266
return true;
242
267
}
244
269
/*
245
270
* Initialize GPGME.
246
271
*/
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
249
277
gpgme_error_t rc;
250
278
gpgme_engine_info_t engine_info;
251
279
252
253
280
/*
254
281
* Helper function to insert pub and seckey to the engine keyring.
255
282
*/
256
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
257
284
int ret;
258
285
int fd;
259
286
gpgme_data_t pgp_data;
271
298
return false;
272
299
}
273
300
274
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
275
302
if(rc != GPG_ERR_NO_ERROR){
276
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
304
gpgme_strsource(rc), gpgme_strerror(rc));
278
305
return false;
279
306
}
280
307
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
308
ret = close(fd);
282
309
if(ret == -1){
283
310
perror_plus("close");
284
311
}
321
348
}
322
349
323
350
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
325
352
if(rc != GPG_ERR_NO_ERROR){
326
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
340
367
* Decrypt OpenPGP data.
341
368
* Returns -1 on error
342
369
*/
370
__attribute__((nonnull, warn_unused_result))
343
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
372
size_t crypto_size,
345
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
346
375
gpgme_data_t dh_crypto, dh_plain;
347
376
gpgme_error_t rc;
348
377
ssize_t ret;
374
403
375
404
/* Decrypt data from the cryptotext data buffer to the plaintext
376
405
data buffer */
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
378
407
if(rc != GPG_ERR_NO_ERROR){
379
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
409
gpgme_strsource(rc), gpgme_strerror(rc));
381
410
plaintext_length = -1;
382
411
if(debug){
383
412
gpgme_decrypt_result_t result;
384
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
385
414
if(result == NULL){
386
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
387
416
} else {
464
493
return plaintext_length;
465
494
}
466
495
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;
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
473
507
}
474
508
475
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
476
511
static void debuggnutls(__attribute__((unused)) int level,
477
512
const char* string){
478
513
fprintf_plus(stderr, "GnuTLS: %s", string);
479
514
}
480
515
516
__attribute__((nonnull, warn_unused_result))
481
517
static int init_gnutls_global(const char *pubkeyfilename,
482
const char *seckeyfilename){
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
483
521
int ret;
522
unsigned int uret;
484
523
485
524
if(debug){
486
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
502
541
}
503
542
504
543
/* OpenPGP credentials */
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
506
545
if(ret != GNUTLS_E_SUCCESS){
507
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
547
safer_gnutls_strerror(ret));
518
557
}
519
558
520
559
ret = gnutls_certificate_set_openpgp_key_file
521
(mc.cred, pubkeyfilename, seckeyfilename,
560
(mc->cred, pubkeyfilename, seckeyfilename,
522
561
GNUTLS_OPENPGP_FMT_BASE64);
523
562
if(ret != GNUTLS_E_SUCCESS){
524
563
fprintf_plus(stderr,
530
569
}
531
570
532
571
/* GnuTLS server initialization */
533
ret = gnutls_dh_params_init(&mc.dh_params);
572
ret = gnutls_dh_params_init(&mc->dh_params);
534
573
if(ret != GNUTLS_E_SUCCESS){
535
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
575
" initialization: %s\n",
537
576
safer_gnutls_strerror(ret));
538
577
goto globalfail;
539
578
}
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);
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
if(params.data == NULL){
619
dhparamsfilename = NULL;
620
}
621
if(dhparamsfilename == NULL){
622
break;
623
}
624
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
625
GNUTLS_X509_FMT_PEM);
626
if(ret != GNUTLS_E_SUCCESS){
627
fprintf_plus(stderr, "Failed to parse DH parameters in file"
628
" \"%s\": %s\n", dhparamsfilename,
629
safer_gnutls_strerror(ret));
630
dhparamsfilename = NULL;
631
}
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
548
752
549
753
return 0;
550
754
551
755
globalfail:
552
756
553
gnutls_certificate_free_credentials(mc.cred);
757
gnutls_certificate_free_credentials(mc->cred);
554
758
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
759
gnutls_dh_params_deinit(mc->dh_params);
556
760
return -1;
557
761
}
558
762
559
static int init_gnutls_session(gnutls_session_t *session){
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
765
mandos_context *mc){
560
766
int ret;
561
767
/* GnuTLS session creation */
562
768
do {
574
780
{
575
781
const char *err;
576
782
do {
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
578
784
if(quit_now){
579
785
gnutls_deinit(*session);
580
786
return -1;
591
797
592
798
do {
593
799
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
mc.cred);
800
mc->cred);
595
801
if(quit_now){
596
802
gnutls_deinit(*session);
597
803
return -1;
607
813
/* ignore client certificate if any. */
608
814
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
609
815
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
611
612
816
return 0;
613
817
}
614
818
616
820
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
617
821
__attribute__((unused)) const char *txt){}
618
822
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
829
ret_errno = errno;
830
}
831
errno = old_errno;
832
return ret_errno;
833
}
834
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
841
errno = old_errno;
842
return ret_errno;
843
}
844
if(setuid(0) == -1){
845
ret_errno = errno;
846
}
847
errno = old_errno;
848
return ret_errno;
849
}
850
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
857
ret_errno = errno;
858
}
859
errno = old_errno;
860
return ret_errno;
861
}
862
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
869
ret_errno = errno;
870
}
871
errno = old_errno;
872
return ret_errno;
873
}
874
875
/* Helper function to add_local_route() and delete_local_route() */
876
__attribute__((nonnull, warn_unused_result))
877
static bool add_delete_local_route(const bool add,
878
const char *address,
879
AvahiIfIndex if_index){
880
int ret;
881
char helper[] = "mandos-client-iprouteadddel";
882
char add_arg[] = "add";
883
char delete_arg[] = "delete";
884
char debug_flag[] = "--debug";
885
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
886
if(pluginhelperdir == NULL){
887
if(debug){
888
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
889
" variable not set; cannot run helper\n");
890
}
891
return false;
892
}
893
894
char interface[IF_NAMESIZE];
895
if(if_indextoname((unsigned int)if_index, interface) == NULL){
896
perror_plus("if_indextoname");
897
return false;
898
}
899
900
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
901
if(devnull == -1){
902
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
return false;
904
}
905
pid_t pid = fork();
906
if(pid == 0){
907
/* Child */
908
/* Raise privileges */
909
errno = raise_privileges_permanently();
910
if(errno != 0){
911
perror_plus("Failed to raise privileges");
912
/* _exit(EX_NOPERM); */
913
} else {
914
/* Set group */
915
errno = 0;
916
ret = setgid(0);
917
if(ret == -1){
918
perror_plus("setgid");
919
_exit(EX_NOPERM);
920
}
921
/* Reset supplementary groups */
922
errno = 0;
923
ret = setgroups(0, NULL);
924
if(ret == -1){
925
perror_plus("setgroups");
926
_exit(EX_NOPERM);
927
}
928
}
929
ret = dup2(devnull, STDIN_FILENO);
930
if(ret == -1){
931
perror_plus("dup2(devnull, STDIN_FILENO)");
932
_exit(EX_OSERR);
933
}
934
ret = close(devnull);
935
if(ret == -1){
936
perror_plus("close");
937
_exit(EX_OSERR);
938
}
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
940
if(ret == -1){
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
942
_exit(EX_OSERR);
943
}
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
945
O_RDONLY
946
| O_DIRECTORY
947
| O_PATH
948
| O_CLOEXEC));
949
if(helperdir_fd == -1){
950
perror_plus("open");
951
_exit(EX_UNAVAILABLE);
952
}
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
954
helper, O_RDONLY));
955
if(helper_fd == -1){
956
perror_plus("openat");
957
close(helperdir_fd);
958
_exit(EX_UNAVAILABLE);
959
}
960
close(helperdir_fd);
961
#ifdef __GNUC__
962
#pragma GCC diagnostic push
963
#pragma GCC diagnostic ignored "-Wcast-qual"
964
#endif
965
if(fexecve(helper_fd, (char *const [])
966
{ helper, add ? add_arg : delete_arg, (char *)address,
967
interface, debug ? debug_flag : NULL, NULL },
968
environ) == -1){
969
#ifdef __GNUC__
970
#pragma GCC diagnostic pop
971
#endif
972
perror_plus("fexecve");
973
_exit(EXIT_FAILURE);
974
}
975
}
976
if(pid == -1){
977
perror_plus("fork");
978
return false;
979
}
980
int status;
981
pid_t pret = -1;
982
errno = 0;
983
do {
984
pret = waitpid(pid, &status, 0);
985
if(pret == -1 and errno == EINTR and quit_now){
986
int errno_raising = 0;
987
if((errno = raise_privileges()) != 0){
988
errno_raising = errno;
989
perror_plus("Failed to raise privileges in order to"
990
" kill helper program");
991
}
992
if(kill(pid, SIGTERM) == -1){
993
perror_plus("kill");
994
}
995
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
996
perror_plus("Failed to lower privileges after killing"
997
" helper program");
998
}
999
return false;
1000
}
1001
} while(pret == -1 and errno == EINTR);
1002
if(pret == -1){
1003
perror_plus("waitpid");
1004
return false;
1005
}
1006
if(WIFEXITED(status)){
1007
if(WEXITSTATUS(status) != 0){
1008
fprintf_plus(stderr, "Error: iprouteadddel exited"
1009
" with status %d\n", WEXITSTATUS(status));
1010
return false;
1011
}
1012
return true;
1013
}
1014
if(WIFSIGNALED(status)){
1015
fprintf_plus(stderr, "Error: iprouteadddel died by"
1016
" signal %d\n", WTERMSIG(status));
1017
return false;
1018
}
1019
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1020
return false;
1021
}
1022
1023
__attribute__((nonnull, warn_unused_result))
1024
static bool add_local_route(const char *address,
1025
AvahiIfIndex if_index){
1026
if(debug){
1027
fprintf_plus(stderr, "Adding route to %s\n", address);
1028
}
1029
return add_delete_local_route(true, address, if_index);
1030
}
1031
1032
__attribute__((nonnull, warn_unused_result))
1033
static bool delete_local_route(const char *address,
1034
AvahiIfIndex if_index){
1035
if(debug){
1036
fprintf_plus(stderr, "Removing route to %s\n", address);
1037
}
1038
return add_delete_local_route(false, address, if_index);
1039
}
1040
619
1041
/* Called when a Mandos server is found */
620
static int start_mandos_communication(const char *ip, uint16_t port,
1042
__attribute__((nonnull, warn_unused_result))
1043
static int start_mandos_communication(const char *ip, in_port_t port,
621
1044
AvahiIfIndex if_index,
622
int af){
1045
int af, mandos_context *mc){
623
1046
int ret, tcp_sd = -1;
624
1047
ssize_t sret;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
1048
struct sockaddr_storage to;
629
1049
char *buffer = NULL;
630
1050
char *decrypted_buffer = NULL;
631
1051
size_t buffer_length = 0;
634
1054
int retval = -1;
635
1055
gnutls_session_t session;
636
1056
int pf; /* Protocol family */
1057
bool route_added = false;
637
1058
638
1059
errno = 0;
639
1060
655
1076
return -1;
656
1077
}
657
1078
658
ret = init_gnutls_session(&session);
1079
/* If the interface is specified and we have a list of interfaces */
1080
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1081
/* Check if the interface is one of the interfaces we are using */
1082
bool match = false;
1083
{
1084
char *interface = NULL;
1085
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1086
interface))){
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1088
match = true;
1089
break;
1090
}
1091
}
1092
}
1093
if(not match){
1094
/* This interface does not match any in the list, so we don't
1095
connect to the server */
1096
if(debug){
1097
char interface[IF_NAMESIZE];
1098
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1099
perror_plus("if_indextoname");
1100
} else {
1101
fprintf_plus(stderr, "Skipping server on non-used interface"
1102
" \"%s\"\n",
1103
if_indextoname((unsigned int)if_index,
1104
interface));
1105
}
1106
}
1107
return -1;
1108
}
1109
}
1110
1111
ret = init_gnutls_session(&session, mc);
659
1112
if(ret != 0){
660
1113
return -1;
661
1114
}
662
1115
663
1116
if(debug){
664
1117
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
1118
PRIuMAX "\n", ip, (uintmax_t)port);
666
1119
}
667
1120
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
669
1122
if(tcp_sd < 0){
670
1123
int e = errno;
671
1124
perror_plus("socket");
678
1131
goto mandos_end;
679
1132
}
680
1133
681
memset(&to, 0, sizeof(to));
682
1134
if(af == AF_INET6){
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
685
1138
} else { /* IPv4 */
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
688
1142
}
689
1143
if(ret < 0 ){
690
1144
int e = errno;
699
1153
goto mandos_end;
700
1154
}
701
1155
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*/
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
709
1159
if(if_index == AVAHI_IF_UNSPEC){
710
1160
fprintf_plus(stderr, "An IPv6 link-local address is"
711
1161
" incomplete without a network interface\n");
713
1163
goto mandos_end;
714
1164
}
715
1165
/* Set the network interface number as scope */
716
to.in6.sin6_scope_id = (uint32_t)if_index;
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
717
1167
}
718
1168
} else {
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
722
1170
}
723
1171
724
1172
if(quit_now){
732
1180
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
1181
perror_plus("if_indextoname");
734
1182
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
737
1185
}
738
1186
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
741
1189
}
742
1190
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
1191
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;
1192
if(af == AF_INET6){
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
} else {
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
}
1203
if(ret == EAI_SYSTEM){
1204
perror_plus("getnameinfo");
1205
} else if(ret != 0) {
1206
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1207
} else if(strcmp(addrstr, ip) != 0){
1208
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1209
}
1210
}
1211
1212
if(quit_now){
1213
errno = EINTR;
1214
goto mandos_end;
1215
}
1216
1217
while(true){
1218
if(af == AF_INET6){
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1221
} else {
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1224
}
1225
if(ret < 0){
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1232
&to)->sin6_addr)))
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1243
1244
Avahi bug reference:
1245
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1247
*/
1248
if(debug){
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1250
" direct route\n");
1251
}
1252
int e = errno;
1253
route_added = add_local_route(ip, if_index);
1254
if(route_added){
1255
continue;
1256
}
1257
errno = e;
1258
}
1259
if(errno != ECONNREFUSED or debug){
1260
int e = errno;
1261
perror_plus("connect");
1262
errno = e;
1263
}
1264
goto mandos_end;
1265
}
1266
1267
if(quit_now){
1268
errno = EINTR;
1269
goto mandos_end;
1270
}
1271
break;
783
1272
}
784
1273
785
1274
const char *out = mandos_protocol_version;
821
1310
goto mandos_end;
822
1311
}
823
1312
824
/* Spurious warning from -Wint-to-pointer-cast */
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1313
/* This casting via intptr_t is to eliminate warning about casting
1314
an int to a pointer type. This is exactly how the GnuTLS Guile
1315
function "set-session-transport-fd!" does it. */
1316
gnutls_transport_set_ptr(session,
1317
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
826
1318
827
1319
if(quit_now){
828
1320
errno = EINTR;
933
1425
if(buffer_length > 0){
934
1426
ssize_t decrypted_buffer_size;
935
1427
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
936
&decrypted_buffer);
1428
&decrypted_buffer, mc);
937
1429
if(decrypted_buffer_size >= 0){
938
1430
939
1431
written = 0;
965
1457
966
1458
mandos_end:
967
1459
{
1460
if(route_added){
1461
if(not delete_local_route(ip, if_index)){
1462
fprintf_plus(stderr, "Failed to delete local route to %s on"
1463
" interface %d", ip, if_index);
1464
}
1465
}
968
1466
int e = errno;
969
1467
free(decrypted_buffer);
970
1468
free(buffer);
971
1469
if(tcp_sd >= 0){
972
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1470
ret = close(tcp_sd);
973
1471
}
974
1472
if(ret == -1){
975
1473
if(e == 0){
987
1485
return retval;
988
1486
}
989
1487
1488
__attribute__((nonnull))
990
1489
static void resolve_callback(AvahiSServiceResolver *r,
991
1490
AvahiIfIndex interface,
992
1491
AvahiProtocol proto,
1000
1499
AVAHI_GCC_UNUSED AvahiStringList *txt,
1001
1500
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1002
1501
flags,
1003
AVAHI_GCC_UNUSED void* userdata){
1004
assert(r);
1502
void *mc){
1503
if(r == NULL){
1504
return;
1505
}
1005
1506
1006
1507
/* Called whenever a service has been resolved successfully or
1007
1508
timed out */
1008
1509
1009
1510
if(quit_now){
1511
avahi_s_service_resolver_free(r);
1010
1512
return;
1011
1513
}
1012
1514
1016
1518
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1017
1519
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1018
1520
domain,
1019
avahi_strerror(avahi_server_errno(mc.server)));
1521
avahi_strerror(avahi_server_errno
1522
(((mandos_context*)mc)->server)));
1020
1523
break;
1021
1524
1022
1525
case AVAHI_RESOLVER_FOUND:
1028
1531
PRIdMAX ") on port %" PRIu16 "\n", name,
1029
1532
host_name, ip, (intmax_t)interface, port);
1030
1533
}
1031
int ret = start_mandos_communication(ip, port, interface,
1032
avahi_proto_to_af(proto));
1534
int ret = start_mandos_communication(ip, (in_port_t)port,
1535
interface,
1536
avahi_proto_to_af(proto),
1537
mc);
1033
1538
if(ret == 0){
1034
avahi_simple_poll_quit(mc.simple_poll);
1539
avahi_simple_poll_quit(simple_poll);
1035
1540
} else {
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1541
if(not add_server(ip, (in_port_t)port, interface,
1542
avahi_proto_to_af(proto),
1543
&((mandos_context*)mc)->current_server)){
1038
1544
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
1545
" list\n", name);
1040
1546
}
1053
1559
const char *domain,
1054
1560
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1055
1561
flags,
1056
AVAHI_GCC_UNUSED void* userdata){
1057
assert(b);
1562
void *mc){
1563
if(b == NULL){
1564
return;
1565
}
1058
1566
1059
1567
/* Called whenever a new services becomes available on the LAN or
1060
1568
is removed from the LAN */
1068
1576
case AVAHI_BROWSER_FAILURE:
1069
1577
1070
1578
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
1072
avahi_simple_poll_quit(mc.simple_poll);
1579
avahi_strerror(avahi_server_errno
1580
(((mandos_context*)mc)->server)));
1581
avahi_simple_poll_quit(simple_poll);
1073
1582
return;
1074
1583
1075
1584
case AVAHI_BROWSER_NEW:
1078
1587
the callback function is called the Avahi server will free the
1079
1588
resolver for us. */
1080
1589
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
name, type, domain, protocol, 0,
1083
resolve_callback, NULL) == NULL)
1590
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1591
interface, protocol, name, type,
1592
domain, protocol, 0,
1593
resolve_callback, mc) == NULL)
1084
1594
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
1595
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
1596
avahi_strerror(avahi_server_errno
1597
(((mandos_context*)mc)->server)));
1087
1598
break;
1088
1599
1089
1600
case AVAHI_BROWSER_REMOVE:
1108
1619
signal_received = sig;
1109
1620
int old_errno = errno;
1110
1621
/* set main loop to exit */
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
1622
if(simple_poll != NULL){
1623
avahi_simple_poll_quit(simple_poll);
1113
1624
}
1114
1625
errno = old_errno;
1115
1626
}
1116
1627
1628
__attribute__((nonnull, warn_unused_result))
1117
1629
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
1630
int ret;
1631
error_t ret_errno;
1119
1632
1120
1633
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1121
1634
if(s < 0){
1635
ret_errno = errno;
1122
1636
perror_plus("socket");
1637
errno = ret_errno;
1123
1638
return false;
1124
1639
}
1125
strcpy(ifr->ifr_name, ifname);
1640
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1641
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1126
1642
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
1643
if(ret == -1){
1128
1644
if(debug){
1645
ret_errno = errno;
1129
1646
perror_plus("ioctl SIOCGIFFLAGS");
1647
errno = ret_errno;
1130
1648
}
1131
1649
return false;
1132
1650
}
1133
1651
return true;
1134
1652
}
1135
1653
1654
__attribute__((nonnull, warn_unused_result))
1136
1655
bool good_flags(const char *ifname, const struct ifreq *ifr){
1137
1656
1138
1657
/* Reject the loopback device */
1180
1699
* corresponds to an acceptable network device.
1181
1700
* (This function is passed to scandir(3) as a filter function.)
1182
1701
*/
1702
__attribute__((nonnull, warn_unused_result))
1183
1703
int good_interface(const struct dirent *if_entry){
1184
1704
if(if_entry->d_name[0] == '.'){
1185
1705
return 0;
1201
1721
}
1202
1722
1203
1723
/*
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1242
}
1243
return 1;
1244
}
1245
1724
* This function determines if a network interface is up.
1725
*/
1726
__attribute__((nonnull, warn_unused_result))
1727
bool interface_is_up(const char *interface){
1728
struct ifreq ifr;
1729
if(not get_flags(interface, &ifr)){
1730
if(debug){
1731
fprintf_plus(stderr, "Failed to get flags for interface "
1732
"\"%s\"\n", interface);
1733
}
1734
return false;
1735
}
1736
1737
return (bool)(ifr.ifr_flags & IFF_UP);
1738
}
1739
1740
/*
1741
* This function determines if a network interface is running
1742
*/
1743
__attribute__((nonnull, warn_unused_result))
1744
bool interface_is_running(const char *interface){
1745
struct ifreq ifr;
1746
if(not get_flags(interface, &ifr)){
1747
if(debug){
1748
fprintf_plus(stderr, "Failed to get flags for interface "
1749
"\"%s\"\n", interface);
1750
}
1751
return false;
1752
}
1753
1754
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1755
}
1756
1757
__attribute__((nonnull, pure, warn_unused_result))
1246
1758
int notdotentries(const struct dirent *direntry){
1247
1759
/* Skip "." and ".." */
1248
1760
if(direntry->d_name[0] == '.'
1255
1767
}
1256
1768
1257
1769
/* Is this directory entry a runnable program? */
1770
__attribute__((nonnull, warn_unused_result))
1258
1771
int runnable_hook(const struct dirent *direntry){
1259
1772
int ret;
1260
1773
size_t sret;
1268
1781
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1269
1782
"abcdefghijklmnopqrstuvwxyz"
1270
1783
"0123456789"
1271
"_-");
1784
"_.-");
1272
1785
if((direntry->d_name)[sret] != '\0'){
1273
1786
/* Contains non-allowed characters */
1274
1787
if(debug){
1278
1791
return 0;
1279
1792
}
1280
1793
1281
char *fullname = NULL;
1282
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1283
if(ret < 0){
1284
perror_plus("asprintf");
1285
return 0;
1286
}
1287
1288
ret = stat(fullname, &st);
1794
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1289
1795
if(ret == -1){
1290
1796
if(debug){
1291
1797
perror_plus("Could not stat hook");
1315
1821
return 1;
1316
1822
}
1317
1823
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1824
__attribute__((nonnull, warn_unused_result))
1825
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1826
mandos_context *mc){
1319
1827
int ret;
1320
1828
struct timespec now;
1321
1829
struct timespec waited_time;
1322
1830
intmax_t block_time;
1323
1831
1324
1832
while(true){
1325
if(mc.current_server == NULL){
1326
if (debug){
1833
if(mc->current_server == NULL){
1834
if(debug){
1327
1835
fprintf_plus(stderr, "Wait until first server is found."
1328
1836
" No timeout!\n");
1329
1837
}
1330
1838
ret = avahi_simple_poll_iterate(s, -1);
1331
1839
} else {
1332
if (debug){
1840
if(debug){
1333
1841
fprintf_plus(stderr, "Check current_server if we should run"
1334
1842
" it, or wait\n");
1335
1843
}
1342
1850
/* Calculating in ms how long time between now and server
1343
1851
who we visted longest time ago. Now - last seen. */
1344
1852
waited_time.tv_sec = (now.tv_sec
1345
- mc.current_server->last_seen.tv_sec);
1853
- mc->current_server->last_seen.tv_sec);
1346
1854
waited_time.tv_nsec = (now.tv_nsec
1347
- mc.current_server->last_seen.tv_nsec);
1855
- mc->current_server->last_seen.tv_nsec);
1348
1856
/* total time is 10s/10,000ms.
1349
1857
Converting to s from ms by dividing by 1,000,
1350
1858
and ns to ms by dividing by 1,000,000. */
1352
1860
- ((intmax_t)waited_time.tv_sec * 1000))
1353
1861
- ((intmax_t)waited_time.tv_nsec / 1000000));
1354
1862
1355
if (debug){
1863
if(debug){
1356
1864
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
1865
block_time);
1358
1866
}
1359
1867
1360
1868
if(block_time <= 0){
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
1869
ret = start_mandos_communication(mc->current_server->ip,
1870
mc->current_server->port,
1871
mc->current_server->if_index,
1872
mc->current_server->af, mc);
1365
1873
if(ret == 0){
1366
avahi_simple_poll_quit(mc.simple_poll);
1874
avahi_simple_poll_quit(s);
1367
1875
return 0;
1368
1876
}
1369
1877
ret = clock_gettime(CLOCK_MONOTONIC,
1370
&mc.current_server->last_seen);
1878
&mc->current_server->last_seen);
1371
1879
if(ret == -1){
1372
1880
perror_plus("clock_gettime");
1373
1881
return -1;
1374
1882
}
1375
mc.current_server = mc.current_server->next;
1883
mc->current_server = mc->current_server->next;
1376
1884
block_time = 0; /* Call avahi to find new Mandos
1377
1885
servers, but don't block */
1378
1886
}
1380
1888
ret = avahi_simple_poll_iterate(s, (int)block_time);
1381
1889
}
1382
1890
if(ret != 0){
1383
if (ret > 0 or errno != EINTR){
1891
if(ret > 0 or errno != EINTR){
1384
1892
return (ret != 1) ? ret : 0;
1385
1893
}
1386
1894
}
1387
1895
}
1388
1896
}
1389
1897
1390
bool run_network_hooks(const char *mode, const char *interface,
1898
__attribute__((nonnull))
1899
void run_network_hooks(const char *mode, const char *interface,
1391
1900
const float delay){
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
alphasort);
1901
struct dirent **direntries = NULL;
1902
if(hookdir_fd == -1){
1903
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1904
| O_CLOEXEC);
1905
if(hookdir_fd == -1){
1906
if(errno == ENOENT){
1907
if(debug){
1908
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1909
" found\n", hookdir);
1910
}
1911
} else {
1912
perror_plus("open");
1913
}
1914
return;
1915
}
1916
}
1917
#ifdef __GLIBC__
1918
#if __GLIBC_PREREQ(2, 15)
1919
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1920
runnable_hook, alphasort);
1921
#else /* not __GLIBC_PREREQ(2, 15) */
1922
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1923
alphasort);
1924
#endif /* not __GLIBC_PREREQ(2, 15) */
1925
#else /* not __GLIBC__ */
1926
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1927
alphasort);
1928
#endif /* not __GLIBC__ */
1397
1929
if(numhooks == -1){
1398
1930
perror_plus("scandir");
1399
} else {
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1405
if(ret < 0){
1931
return;
1932
}
1933
struct dirent *direntry;
1934
int ret;
1935
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1936
if(devnull == -1){
1937
perror_plus("open(\"/dev/null\", O_RDONLY)");
1938
return;
1939
}
1940
for(int i = 0; i < numhooks; i++){
1941
direntry = direntries[i];
1942
if(debug){
1943
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1944
direntry->d_name);
1945
}
1946
pid_t hook_pid = fork();
1947
if(hook_pid == 0){
1948
/* Child */
1949
/* Raise privileges */
1950
errno = raise_privileges_permanently();
1951
if(errno != 0){
1952
perror_plus("Failed to raise privileges");
1953
_exit(EX_NOPERM);
1954
}
1955
/* Set group */
1956
errno = 0;
1957
ret = setgid(0);
1958
if(ret == -1){
1959
perror_plus("setgid");
1960
_exit(EX_NOPERM);
1961
}
1962
/* Reset supplementary groups */
1963
errno = 0;
1964
ret = setgroups(0, NULL);
1965
if(ret == -1){
1966
perror_plus("setgroups");
1967
_exit(EX_NOPERM);
1968
}
1969
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1970
if(ret == -1){
1971
perror_plus("setenv");
1972
_exit(EX_OSERR);
1973
}
1974
ret = setenv("DEVICE", interface, 1);
1975
if(ret == -1){
1976
perror_plus("setenv");
1977
_exit(EX_OSERR);
1978
}
1979
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1980
if(ret == -1){
1981
perror_plus("setenv");
1982
_exit(EX_OSERR);
1983
}
1984
ret = setenv("MODE", mode, 1);
1985
if(ret == -1){
1986
perror_plus("setenv");
1987
_exit(EX_OSERR);
1988
}
1989
char *delaystring;
1990
ret = asprintf(&delaystring, "%f", (double)delay);
1991
if(ret == -1){
1406
1992
perror_plus("asprintf");
1407
continue;
1408
}
1409
if(debug){
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1411
direntry->d_name);
1412
}
1413
pid_t hook_pid = fork();
1414
if(hook_pid == 0){
1415
/* Child */
1416
/* Raise privileges */
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1428
/* Set group */
1429
errno = 0;
1430
ret = setgid(0);
1431
if(ret == -1){
1432
perror_plus("setgid");
1433
}
1434
/* Reset supplementary groups */
1435
errno = 0;
1436
ret = setgroups(0, NULL);
1437
if(ret == -1){
1438
perror_plus("setgroups");
1439
}
1440
dup2(devnull, STDIN_FILENO);
1441
close(devnull);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1444
if(ret == -1){
1445
perror_plus("setenv");
1446
_exit(EX_OSERR);
1447
}
1448
ret = setenv("DEVICE", interface, 1);
1449
if(ret == -1){
1450
perror_plus("setenv");
1451
_exit(EX_OSERR);
1452
}
1453
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1454
if(ret == -1){
1455
perror_plus("setenv");
1456
_exit(EX_OSERR);
1457
}
1458
ret = setenv("MODE", mode, 1);
1459
if(ret == -1){
1460
perror_plus("setenv");
1461
_exit(EX_OSERR);
1462
}
1463
char *delaystring;
1464
ret = asprintf(&delaystring, "%f", delay);
1465
if(ret == -1){
1466
perror_plus("asprintf");
1467
_exit(EX_OSERR);
1468
}
1469
ret = setenv("DELAY", delaystring, 1);
1470
if(ret == -1){
1471
free(delaystring);
1472
perror_plus("setenv");
1473
_exit(EX_OSERR);
1474
}
1993
_exit(EX_OSERR);
1994
}
1995
ret = setenv("DELAY", delaystring, 1);
1996
if(ret == -1){
1475
1997
free(delaystring);
1476
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1477
perror_plus("execl");
1478
_exit(EXIT_FAILURE);
1479
}
1480
} else {
1481
int status;
1482
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1483
perror_plus("waitpid");
1484
free(fullname);
1485
continue;
1486
}
1487
if(WIFEXITED(status)){
1488
if(WEXITSTATUS(status) != 0){
1489
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1490
" with status %d\n", direntry->d_name,
1491
WEXITSTATUS(status));
1492
free(fullname);
1493
continue;
1494
}
1495
} else if(WIFSIGNALED(status)){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1497
" signal %d\n", direntry->d_name,
1498
WTERMSIG(status));
1499
free(fullname);
1500
continue;
1501
} else {
1502
fprintf_plus(stderr, "Warning: network hook \"%s\""
1503
" crashed\n", direntry->d_name);
1504
free(fullname);
1505
continue;
1506
}
1507
}
1508
free(fullname);
1509
if(debug){
1510
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1511
direntry->d_name);
1512
}
1513
}
1514
close(devnull);
1515
}
1516
return true;
1998
perror_plus("setenv");
1999
_exit(EX_OSERR);
2000
}
2001
free(delaystring);
2002
if(connect_to != NULL){
2003
ret = setenv("CONNECT", connect_to, 1);
2004
if(ret == -1){
2005
perror_plus("setenv");
2006
_exit(EX_OSERR);
2007
}
2008
}
2009
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2010
direntry->d_name,
2011
O_RDONLY));
2012
if(hook_fd == -1){
2013
perror_plus("openat");
2014
_exit(EXIT_FAILURE);
2015
}
2016
if(close(hookdir_fd) == -1){
2017
perror_plus("close");
2018
_exit(EXIT_FAILURE);
2019
}
2020
ret = dup2(devnull, STDIN_FILENO);
2021
if(ret == -1){
2022
perror_plus("dup2(devnull, STDIN_FILENO)");
2023
_exit(EX_OSERR);
2024
}
2025
ret = close(devnull);
2026
if(ret == -1){
2027
perror_plus("close");
2028
_exit(EX_OSERR);
2029
}
2030
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2031
if(ret == -1){
2032
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2033
_exit(EX_OSERR);
2034
}
2035
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2036
environ) == -1){
2037
perror_plus("fexecve");
2038
_exit(EXIT_FAILURE);
2039
}
2040
} else {
2041
if(hook_pid == -1){
2042
perror_plus("fork");
2043
free(direntry);
2044
continue;
2045
}
2046
int status;
2047
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2048
perror_plus("waitpid");
2049
free(direntry);
2050
continue;
2051
}
2052
if(WIFEXITED(status)){
2053
if(WEXITSTATUS(status) != 0){
2054
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2055
" with status %d\n", direntry->d_name,
2056
WEXITSTATUS(status));
2057
free(direntry);
2058
continue;
2059
}
2060
} else if(WIFSIGNALED(status)){
2061
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2062
" signal %d\n", direntry->d_name,
2063
WTERMSIG(status));
2064
free(direntry);
2065
continue;
2066
} else {
2067
fprintf_plus(stderr, "Warning: network hook \"%s\""
2068
" crashed\n", direntry->d_name);
2069
free(direntry);
2070
continue;
2071
}
2072
}
2073
if(debug){
2074
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2075
direntry->d_name);
2076
}
2077
free(direntry);
2078
}
2079
free(direntries);
2080
if(close(hookdir_fd) == -1){
2081
perror_plus("close");
2082
} else {
2083
hookdir_fd = -1;
2084
}
2085
close(devnull);
2086
}
2087
2088
__attribute__((nonnull, warn_unused_result))
2089
error_t bring_up_interface(const char *const interface,
2090
const float delay){
2091
error_t old_errno = errno;
2092
int ret;
2093
struct ifreq network;
2094
unsigned int if_index = if_nametoindex(interface);
2095
if(if_index == 0){
2096
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2097
errno = old_errno;
2098
return ENXIO;
2099
}
2100
2101
if(quit_now){
2102
errno = old_errno;
2103
return EINTR;
2104
}
2105
2106
if(not interface_is_up(interface)){
2107
error_t ret_errno = 0, ioctl_errno = 0;
2108
if(not get_flags(interface, &network)){
2109
ret_errno = errno;
2110
fprintf_plus(stderr, "Failed to get flags for interface "
2111
"\"%s\"\n", interface);
2112
errno = old_errno;
2113
return ret_errno;
2114
}
2115
network.ifr_flags |= IFF_UP; /* set flag */
2116
2117
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2118
if(sd == -1){
2119
ret_errno = errno;
2120
perror_plus("socket");
2121
errno = old_errno;
2122
return ret_errno;
2123
}
2124
2125
if(quit_now){
2126
ret = close(sd);
2127
if(ret == -1){
2128
perror_plus("close");
2129
}
2130
errno = old_errno;
2131
return EINTR;
2132
}
2133
2134
if(debug){
2135
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2136
interface);
2137
}
2138
2139
/* Raise privileges */
2140
ret_errno = raise_privileges();
2141
if(ret_errno != 0){
2142
errno = ret_errno;
2143
perror_plus("Failed to raise privileges");
2144
}
2145
2146
#ifdef __linux__
2147
int ret_linux;
2148
bool restore_loglevel = false;
2149
if(ret_errno == 0){
2150
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2151
messages about the network interface to mess up the prompt */
2152
ret_linux = klogctl(8, NULL, 5);
2153
if(ret_linux == -1){
2154
perror_plus("klogctl");
2155
} else {
2156
restore_loglevel = true;
2157
}
2158
}
2159
#endif /* __linux__ */
2160
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2161
ioctl_errno = errno;
2162
#ifdef __linux__
2163
if(restore_loglevel){
2164
ret_linux = klogctl(7, NULL, 0);
2165
if(ret_linux == -1){
2166
perror_plus("klogctl");
2167
}
2168
}
2169
#endif /* __linux__ */
2170
2171
/* If raise_privileges() succeeded above */
2172
if(ret_errno == 0){
2173
/* Lower privileges */
2174
ret_errno = lower_privileges();
2175
if(ret_errno != 0){
2176
errno = ret_errno;
2177
perror_plus("Failed to lower privileges");
2178
}
2179
}
2180
2181
/* Close the socket */
2182
ret = close(sd);
2183
if(ret == -1){
2184
perror_plus("close");
2185
}
2186
2187
if(ret_setflags == -1){
2188
errno = ioctl_errno;
2189
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2190
errno = old_errno;
2191
return ioctl_errno;
2192
}
2193
} else if(debug){
2194
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2195
interface);
2196
}
2197
2198
/* Sleep checking until interface is running.
2199
Check every 0.25s, up to total time of delay */
2200
for(int i=0; i < delay * 4; i++){
2201
if(interface_is_running(interface)){
2202
break;
2203
}
2204
struct timespec sleeptime = { .tv_nsec = 250000000 };
2205
ret = nanosleep(&sleeptime, NULL);
2206
if(ret == -1 and errno != EINTR){
2207
perror_plus("nanosleep");
2208
}
2209
}
2210
2211
errno = old_errno;
2212
return 0;
2213
}
2214
2215
__attribute__((nonnull, warn_unused_result))
2216
error_t take_down_interface(const char *const interface){
2217
error_t old_errno = errno;
2218
struct ifreq network;
2219
unsigned int if_index = if_nametoindex(interface);
2220
if(if_index == 0){
2221
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2222
errno = old_errno;
2223
return ENXIO;
2224
}
2225
if(interface_is_up(interface)){
2226
error_t ret_errno = 0, 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;
1517
2288
}
1518
2289
1519
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 };
1520
2296
AvahiSServiceBrowser *sb = NULL;
1521
int error;
2297
error_t ret_errno;
1522
2298
int ret;
1523
2299
intmax_t tmpmax;
1524
2300
char *tmp;
1525
2301
int exitcode = EXIT_SUCCESS;
1526
const char *interface = "";
1527
struct ifreq network;
1528
int sd = -1;
1529
bool take_down_interface = false;
1530
uid_t uid;
1531
gid_t gid;
1532
char tempdir[] = "/tmp/mandosXXXXXX";
1533
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;
1534
2307
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1535
2308
const char *seckey = PATHDIR "/" SECKEY;
1536
2309
const char *pubkey = PATHDIR "/" PUBKEY;
2310
const char *dh_params_file = NULL;
2311
char *interfaces_hooks = NULL;
1537
2312
1538
2313
bool gnutls_initialized = false;
1539
2314
bool gpgme_initialized = false;
1591
2366
.doc = "Bit length of the prime number used in the"
1592
2367
" Diffie-Hellman key exchange",
1593
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 },
1594
2374
{ .name = "priority", .key = 130,
1595
2375
.arg = "STRING",
1596
2376
.doc = "GnuTLS priority string for the TLS handshake",
1601
2381
.group = 2 },
1602
2382
{ .name = "retry", .key = 132,
1603
2383
.arg = "SECONDS",
1604
.doc = "Retry interval used when denied by the mandos server",
2384
.doc = "Retry interval used when denied by the Mandos server",
1605
2385
.group = 2 },
1606
2386
{ .name = "network-hook-dir", .key = 133,
1607
2387
.arg = "DIR",
1630
2410
connect_to = arg;
1631
2411
break;
1632
2412
case 'i': /* --interface */
1633
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
}
1634
2418
break;
1635
2419
case 's': /* --seckey */
1636
2420
seckey = arg;
1647
2431
}
1648
2432
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1649
2433
break;
2434
case 134: /* --dh-params */
2435
dh_params_file = arg;
2436
break;
1650
2437
case 130: /* --priority */
1651
2438
mc.priority = arg;
1652
2439
break;
1708
2495
goto end;
1709
2496
}
1710
2497
}
1711
2498
1712
2499
{
1713
2500
/* Work around Debian bug #633582:
1714
2501
<http://bugs.debian.org/633582> */
1715
2502
1716
/* Re-raise priviliges */
1717
errno = 0;
1718
ret = seteuid(0);
1719
if(ret == -1){
1720
perror_plus("seteuid");
2503
/* Re-raise privileges */
2504
ret_errno = raise_privileges();
2505
if(ret_errno != 0){
2506
errno = ret_errno;
2507
perror_plus("Failed to raise privileges");
1721
2508
} else {
1722
2509
struct stat st;
1723
2510
1738
2525
}
1739
2526
}
1740
2527
}
1741
TEMP_FAILURE_RETRY(close(seckey_fd));
2528
close(seckey_fd);
1742
2529
}
1743
2530
}
1744
2531
1745
2532
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1746
2533
int pubkey_fd = open(pubkey, O_RDONLY);
1747
2534
if(pubkey_fd == -1){
1759
2546
}
1760
2547
}
1761
2548
}
1762
TEMP_FAILURE_RETRY(close(pubkey_fd));
1763
}
1764
}
1765
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
1766
2575
/* Lower privileges */
1767
errno = 0;
1768
ret = seteuid(uid);
1769
if(ret == -1){
1770
perror_plus("seteuid");
2576
ret_errno = lower_privileges();
2577
if(ret_errno != 0){
2578
errno = ret_errno;
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;
1771
2597
}
1772
2598
}
1773
2599
}
1774
2600
1775
2601
/* Run network hooks */
1776
if(not run_network_hooks("start", interface, delay)){
1777
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);
1778
2614
}
1779
2615
1780
2616
if(not debug){
1781
2617
avahi_set_log_function(empty_log);
1782
2618
}
1783
2619
1784
if(interface[0] == '\0'){
1785
struct dirent **direntries;
1786
/* First look for interfaces that are up */
1787
ret = scandir(sys_class_net, &direntries, up_interface,
1788
alphasort);
1789
if(ret == 0){
1790
/* No up interfaces, look for any good interfaces */
1791
free(direntries);
1792
ret = scandir(sys_class_net, &direntries, good_interface,
1793
alphasort);
1794
}
1795
if(ret >= 1){
1796
/* Pick the first interface returned */
1797
interface = strdup(direntries[0]->d_name);
1798
if(debug){
1799
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1800
}
1801
if(interface == NULL){
1802
perror_plus("malloc");
1803
free(direntries);
1804
exitcode = EXIT_FAILURE;
1805
goto end;
1806
}
1807
free(direntries);
1808
} else {
1809
free(direntries);
1810
fprintf_plus(stderr, "Could not find a network interface\n");
1811
exitcode = EXIT_FAILURE;
1812
goto end;
1813
}
1814
}
1815
1816
2620
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1817
2621
from the signal handler */
1818
2622
/* Initialize the pseudo-RNG for Avahi */
1819
2623
srand((unsigned int) time(NULL));
1820
mc.simple_poll = avahi_simple_poll_new();
1821
if(mc.simple_poll == NULL){
2624
simple_poll = avahi_simple_poll_new();
2625
if(simple_poll == NULL){
1822
2626
fprintf_plus(stderr,
1823
2627
"Avahi: Failed to create simple poll object.\n");
1824
2628
exitcode = EX_UNAVAILABLE;
1888
2692
}
1889
2693
}
1890
2694
1891
/* If the interface is down, bring it up */
1892
if(strcmp(interface, "none") != 0){
1893
if_index = (AvahiIfIndex) if_nametoindex(interface);
1894
if(if_index == 0){
1895
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1896
exitcode = EX_UNAVAILABLE;
1897
goto end;
1898
}
1899
1900
if(quit_now){
1901
goto end;
1902
}
1903
1904
/* Re-raise priviliges */
1905
errno = 0;
1906
ret = seteuid(0);
1907
if(ret == -1){
1908
perror_plus("seteuid");
1909
}
1910
1911
#ifdef __linux__
1912
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1913
messages about the network interface to mess up the prompt */
1914
ret = klogctl(8, NULL, 5);
1915
bool restore_loglevel = true;
1916
if(ret == -1){
1917
restore_loglevel = false;
1918
perror_plus("klogctl");
1919
}
1920
#endif /* __linux__ */
1921
1922
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1923
if(sd < 0){
1924
perror_plus("socket");
1925
exitcode = EX_OSERR;
1926
#ifdef __linux__
1927
if(restore_loglevel){
1928
ret = klogctl(7, NULL, 0);
1929
if(ret == -1){
1930
perror_plus("klogctl");
1931
}
1932
}
1933
#endif /* __linux__ */
1934
/* Lower privileges */
1935
errno = 0;
1936
ret = seteuid(uid);
1937
if(ret == -1){
1938
perror_plus("seteuid");
1939
}
1940
goto end;
1941
}
1942
strcpy(network.ifr_name, interface);
1943
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1944
if(ret == -1){
1945
perror_plus("ioctl SIOCGIFFLAGS");
1946
#ifdef __linux__
1947
if(restore_loglevel){
1948
ret = klogctl(7, NULL, 0);
1949
if(ret == -1){
1950
perror_plus("klogctl");
1951
}
1952
}
1953
#endif /* __linux__ */
1954
exitcode = EX_OSERR;
1955
/* Lower privileges */
1956
errno = 0;
1957
ret = seteuid(uid);
1958
if(ret == -1){
1959
perror_plus("seteuid");
1960
}
1961
goto end;
1962
}
1963
if((network.ifr_flags & IFF_UP) == 0){
1964
network.ifr_flags |= IFF_UP;
1965
take_down_interface = true;
1966
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1967
if(ret == -1){
1968
take_down_interface = false;
1969
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1970
exitcode = EX_OSERR;
1971
#ifdef __linux__
1972
if(restore_loglevel){
1973
ret = klogctl(7, NULL, 0);
1974
if(ret == -1){
1975
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;
1976
2746
}
1977
2747
}
1978
#endif /* __linux__ */
1979
/* Lower privileges */
1980
errno = 0;
1981
ret = seteuid(uid);
1982
if(ret == -1){
1983
perror_plus("seteuid");
1984
}
1985
goto end;
1986
}
1987
}
1988
/* Sleep checking until interface is running.
1989
Check every 0.25s, up to total time of delay */
1990
for(int i=0; i < delay * 4; i++){
1991
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1992
if(ret == -1){
1993
perror_plus("ioctl SIOCGIFFLAGS");
1994
} else if(network.ifr_flags & IFF_RUNNING){
1995
2748
break;
1996
2749
}
1997
struct timespec sleeptime = { .tv_nsec = 250000000 };
1998
ret = nanosleep(&sleeptime, NULL);
1999
if(ret == -1 and errno != EINTR){
2000
perror_plus("nanosleep");
2001
}
2002
}
2003
if(not take_down_interface){
2004
/* We won't need the socket anymore */
2005
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2006
if(ret == -1){
2007
perror_plus("close");
2008
}
2009
}
2010
#ifdef __linux__
2011
if(restore_loglevel){
2012
/* Restores kernel loglevel to default */
2013
ret = klogctl(7, NULL, 0);
2014
if(ret == -1){
2015
perror_plus("klogctl");
2016
}
2017
}
2018
#endif /* __linux__ */
2019
/* Lower privileges */
2020
errno = 0;
2021
/* Lower privileges */
2022
ret = seteuid(uid);
2023
if(ret == -1){
2024
perror_plus("seteuid");
2025
}
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);
2026
2778
}
2027
2779
2028
2780
if(quit_now){
2029
2781
goto end;
2030
2782
}
2031
2783
2032
ret = init_gnutls_global(pubkey, seckey);
2784
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2033
2785
if(ret == -1){
2034
2786
fprintf_plus(stderr, "init_gnutls_global failed\n");
2035
2787
exitcode = EX_UNAVAILABLE;
2042
2794
goto end;
2043
2795
}
2044
2796
2045
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){
2046
2807
perror_plus("mkdtemp");
2047
2808
goto end;
2048
2809
}
2049
tempdir_created = true;
2050
2810
2051
2811
if(quit_now){
2052
2812
goto end;
2053
2813
}
2054
2814
2055
if(not init_gpgme(pubkey, seckey, tempdir)){
2815
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2056
2816
fprintf_plus(stderr, "init_gpgme failed\n");
2057
2817
exitcode = EX_UNAVAILABLE;
2058
2818
goto end;
2068
2828
/* Connect directly, do not use Zeroconf */
2069
2829
/* (Mainly meant for debugging) */
2070
2830
char *address = strrchr(connect_to, ':');
2831
2071
2832
if(address == NULL){
2072
2833
fprintf_plus(stderr, "No colon in address\n");
2073
2834
exitcode = EX_USAGE;
2078
2839
goto end;
2079
2840
}
2080
2841
2081
uint16_t port;
2842
in_port_t port;
2082
2843
errno = 0;
2083
2844
tmpmax = strtoimax(address+1, &tmp, 10);
2084
2845
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2085
or tmpmax != (uint16_t)tmpmax){
2846
or tmpmax != (in_port_t)tmpmax){
2086
2847
fprintf_plus(stderr, "Bad port number\n");
2087
2848
exitcode = EX_USAGE;
2088
2849
goto end;
2089
2850
}
2090
2851
2091
2852
if(quit_now){
2092
2853
goto end;
2093
2854
}
2094
2855
2095
port = (uint16_t)tmpmax;
2856
port = (in_port_t)tmpmax;
2096
2857
*address = '\0';
2097
2858
/* Colon in address indicates IPv6 */
2098
2859
int af;
2114
2875
}
2115
2876
2116
2877
while(not quit_now){
2117
ret = start_mandos_communication(address, port, if_index, af);
2878
ret = start_mandos_communication(address, port, if_index, af,
2879
&mc);
2118
2880
if(quit_now or ret == 0){
2119
2881
break;
2120
2882
}
2122
2884
fprintf_plus(stderr, "Retrying in %d seconds\n",
2123
2885
(int)retry_interval);
2124
2886
}
2125
sleep((int)retry_interval);
2887
sleep((unsigned int)retry_interval);
2126
2888
}
2127
2889
2128
if (not quit_now){
2890
if(not quit_now){
2129
2891
exitcode = EXIT_SUCCESS;
2130
2892
}
2131
2893
2146
2908
config.publish_domain = 0;
2147
2909
2148
2910
/* Allocate a new server */
2149
mc.server = avahi_server_new(avahi_simple_poll_get
2150
(mc.simple_poll), &config, NULL,
2151
NULL, &error);
2911
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2912
&config, NULL, NULL, &ret_errno);
2152
2913
2153
2914
/* Free the Avahi configuration data */
2154
2915
avahi_server_config_free(&config);
2157
2918
/* Check if creating the Avahi server object succeeded */
2158
2919
if(mc.server == NULL){
2159
2920
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2160
avahi_strerror(error));
2921
avahi_strerror(ret_errno));
2161
2922
exitcode = EX_UNAVAILABLE;
2162
2923
goto end;
2163
2924
}
2169
2930
/* Create the Avahi service browser */
2170
2931
sb = avahi_s_service_browser_new(mc.server, if_index,
2171
2932
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2172
NULL, 0, browse_callback, NULL);
2933
NULL, 0, browse_callback,
2934
(void *)&mc);
2173
2935
if(sb == NULL){
2174
2936
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2175
2937
avahi_strerror(avahi_server_errno(mc.server)));
2186
2948
if(debug){
2187
2949
fprintf_plus(stderr, "Starting Avahi loop search\n");
2188
2950
}
2189
2190
ret = avahi_loop_with_timeout(mc.simple_poll,
2191
(int)(retry_interval * 1000));
2951
2952
ret = avahi_loop_with_timeout(simple_poll,
2953
(int)(retry_interval * 1000), &mc);
2192
2954
if(debug){
2193
2955
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2194
2956
(ret == 0) ? "successfully" : "with error");
2201
2963
}
2202
2964
2203
2965
/* Cleanup things */
2966
free(mc.interfaces);
2967
2204
2968
if(sb != NULL)
2205
2969
avahi_s_service_browser_free(sb);
2206
2970
2207
2971
if(mc.server != NULL)
2208
2972
avahi_server_free(mc.server);
2209
2973
2210
if(mc.simple_poll != NULL)
2211
avahi_simple_poll_free(mc.simple_poll);
2974
if(simple_poll != NULL)
2975
avahi_simple_poll_free(simple_poll);
2212
2976
2213
2977
if(gnutls_initialized){
2214
2978
gnutls_certificate_free_credentials(mc.cred);
2226
2990
mc.current_server->prev->next = NULL;
2227
2991
while(mc.current_server != NULL){
2228
2992
server *next = mc.current_server->next;
2993
#ifdef __GNUC__
2994
#pragma GCC diagnostic push
2995
#pragma GCC diagnostic ignored "-Wcast-qual"
2996
#endif
2997
free((char *)(mc.current_server->ip));
2998
#ifdef __GNUC__
2999
#pragma GCC diagnostic pop
3000
#endif
2229
3001
free(mc.current_server);
2230
3002
mc.current_server = next;
2231
3003
}
2232
3004
}
2233
3005
2234
/* Run network hooks */
2235
run_network_hooks("stop", interface, delay);
2236
2237
/* Re-raise priviliges */
3006
/* Re-raise privileges */
2238
3007
{
2239
errno = 0;
2240
ret = seteuid(0);
2241
if(ret == -1){
2242
perror_plus("seteuid");
3008
ret_errno = raise_privileges();
3009
if(ret_errno != 0){
3010
errno = ret_errno;
3011
perror_plus("Failed to raise privileges");
3012
} else {
3013
3014
/* Run network hooks */
3015
run_network_hooks("stop", interfaces_hooks != NULL ?
3016
interfaces_hooks : "", delay);
3017
3018
/* Take down the network interfaces which were brought up */
3019
{
3020
char *interface = NULL;
3021
while((interface=argz_next(interfaces_to_take_down,
3022
interfaces_to_take_down_size,
3023
interface))){
3024
ret_errno = take_down_interface(interface);
3025
if(ret_errno != 0){
3026
errno = ret_errno;
3027
perror_plus("Failed to take down interface");
3028
}
3029
}
3030
if(debug and (interfaces_to_take_down == NULL)){
3031
fprintf_plus(stderr, "No interfaces needed to be taken"
3032
" down\n");
3033
}
3034
}
2243
3035
}
2244
3036
2245
/* Take down the network interface */
2246
if(take_down_interface and geteuid() == 0){
2247
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2248
if(ret == -1){
2249
perror_plus("ioctl SIOCGIFFLAGS");
2250
} else if(network.ifr_flags & IFF_UP){
2251
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2252
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2253
if(ret == -1){
2254
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2255
}
2256
}
2257
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2258
if(ret == -1){
2259
perror_plus("close");
2260
}
3037
ret_errno = lower_privileges_permanently();
3038
if(ret_errno != 0){
3039
errno = ret_errno;
3040
perror_plus("Failed to lower privileges permanently");
2261
3041
}
2262
3042
}
2263
/* Lower privileges permanently */
2264
errno = 0;
2265
ret = setuid(uid);
2266
if(ret == -1){
2267
perror_plus("setuid");
2268
}
3043
3044
free(interfaces_to_take_down);
3045
free(interfaces_hooks);
2269
3046
2270
3047
/* Removes the GPGME temp directory and all files inside */
2271
if(tempdir_created){
3048
if(tempdir != NULL){
2272
3049
struct dirent **direntries = NULL;
2273
struct dirent *direntry = NULL;
2274
int numentries = scandir(tempdir, &direntries, notdotentries,
2275
alphasort);
2276
if (numentries > 0){
2277
for(int i = 0; i < numentries; i++){
2278
direntry = direntries[i];
2279
char *fullname = NULL;
2280
ret = asprintf(&fullname, "%s/%s", tempdir,
2281
direntry->d_name);
2282
if(ret < 0){
2283
perror_plus("asprintf");
2284
continue;
2285
}
2286
ret = remove(fullname);
2287
if(ret == -1){
2288
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2289
strerror(errno));
2290
}
2291
free(fullname);
3050
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3051
| O_NOFOLLOW
3052
| O_DIRECTORY
3053
| O_PATH));
3054
if(tempdir_fd == -1){
3055
perror_plus("open");
3056
} else {
3057
#ifdef __GLIBC__
3058
#if __GLIBC_PREREQ(2, 15)
3059
int numentries = scandirat(tempdir_fd, ".", &direntries,
3060
notdotentries, alphasort);
3061
#else /* not __GLIBC_PREREQ(2, 15) */
3062
int numentries = scandir(tempdir, &direntries, notdotentries,
3063
alphasort);
3064
#endif /* not __GLIBC_PREREQ(2, 15) */
3065
#else /* not __GLIBC__ */
3066
int numentries = scandir(tempdir, &direntries, notdotentries,
3067
alphasort);
3068
#endif /* not __GLIBC__ */
3069
if(numentries >= 0){
3070
for(int i = 0; i < numentries; i++){
3071
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3072
if(ret == -1){
3073
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3074
" \"%s\", 0): %s\n", tempdir,
3075
direntries[i]->d_name, strerror(errno));
3076
}
3077
free(direntries[i]);
3078
}
3079
3080
/* need to clean even if 0 because man page doesn't specify */
3081
free(direntries);
3082
if(numentries == -1){
3083
perror_plus("scandir");
3084
}
3085
ret = rmdir(tempdir);
3086
if(ret == -1 and errno != ENOENT){
3087
perror_plus("rmdir");
3088
}
2292
3089
}
2293
}
2294
2295
/* need to clean even if 0 because man page doesn't specify */
2296
free(direntries);
2297
if (numentries == -1){
2298
perror_plus("scandir");
2299
}
2300
ret = rmdir(tempdir);
2301
if(ret == -1 and errno != ENOENT){
2302
perror_plus("rmdir");
3090
close(tempdir_fd);
2303
3091
}
2304
3092
}
2305
3093
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0