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237.7.142
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2012-06-01 21:48:12 UTC
- mto: (237.7.144 trunk) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 302.
- Revision ID: teddy@recompile.se-20120601214812-g7685v5oeiuhi2qw
* debian/copyright (Copyright): Join the two lines to one line.
* debian/mandos-client.README.Debian: Refer to new location of example
network hooks.
* debian/mandos-client.docs (network-hooks.d): Removed.
* debian/mandos-client.examples: New; contains "network-hooks.d".
* debian/rules (binary-common): Added "dh_installexamples".
(binary-common/dh_fixperms): Changed to exclude new location of
"network-hooks.d".
* init.d-mandos (status): Support new "status" action.
* debian/mandos-client.README.Debian: Refer to new location of example
network hooks.
* debian/mandos-client.docs (network-hooks.d): Removed.
* debian/mandos-client.examples: New; contains "network-hooks.d".
* debian/rules (binary-common): Added "dh_installexamples".
(binary-common/dh_fixperms): Changed to exclude new location of
"network-hooks.d".
* init.d-mandos (status): Support new "status" action.
- files removed:
- debian/upstream
- plugin-helpers
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
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
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
78
#include <iso646.h> /* not, or, and */
80
79
#include <argp.h> /* struct argp_option, error_t, struct
81
80
argp_state, struct argp,
89
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
89
WEXITSTATUS(), WTERMSIG() */
91
90
#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() */
98
91
99
92
#ifdef __linux__
100
93
#include <sys/klog.h> /* klogctl() */
142
135
static const char sys_class_net[] = "/sys/class/net";
143
136
char *connect_to = NULL;
144
137
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
138
149
139
/* Doubly linked list that need to be circularly linked when used */
150
140
typedef struct server{
151
141
const char *ip;
152
in_port_t port;
142
uint16_t port;
153
143
AvahiIfIndex if_index;
154
144
int af;
155
145
struct timespec last_seen;
159
149
160
150
/* Used for passing in values through the Avahi callback functions */
161
151
typedef struct {
152
AvahiSimplePoll *simple_poll;
162
153
AvahiServer *server;
163
154
gnutls_certificate_credentials_t cred;
164
155
unsigned int dh_bits;
166
157
const char *priority;
167
158
gpgme_ctx_t ctx;
168
159
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
160
} mandos_context;
172
161
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
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 };
175
167
176
168
sig_atomic_t quit_now = 0;
177
169
int signal_received = 0;
185
177
perror(print_text);
186
178
}
187
179
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
180
__attribute__((format (gnu_printf, 2, 3)))
189
181
int fprintf_plus(FILE *stream, const char *format, ...){
190
182
va_list ap;
191
183
va_start (ap, format);
192
184
193
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
186
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
188
}
197
189
198
190
/*
200
192
* bytes. "buffer_capacity" is how much is currently allocated,
201
193
* "buffer_length" is how much is already used.
202
194
*/
203
__attribute__((nonnull, warn_unused_result))
204
195
size_t incbuffer(char **buffer, size_t buffer_length,
205
196
size_t buffer_capacity){
206
197
if(buffer_length + BUFFER_SIZE > buffer_capacity){
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;
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
213
200
return 0;
214
201
}
215
*buffer = new_buf;
216
202
buffer_capacity += BUFFER_SIZE;
217
203
}
218
204
return buffer_capacity;
219
205
}
220
206
221
207
/* Add server to set of servers to retry periodically */
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){
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
225
210
int ret;
226
211
server *new_server = malloc(sizeof(server));
227
212
if(new_server == NULL){
234
219
.af = af };
235
220
if(new_server->ip == NULL){
236
221
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);
252
222
return false;
253
223
}
254
224
/* Special case of first server */
255
if(*current_server == NULL){
225
if (mc.current_server == NULL){
256
226
new_server->next = new_server;
257
227
new_server->prev = new_server;
258
*current_server = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
259
230
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
263
233
new_server->prev->next = new_server;
264
(*current_server)->prev = 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;
265
240
}
266
241
return true;
267
242
}
269
244
/*
270
245
* Initialize GPGME.
271
246
*/
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){
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
277
249
gpgme_error_t rc;
278
250
gpgme_engine_info_t engine_info;
279
251
252
280
253
/*
281
254
* Helper function to insert pub and seckey to the engine keyring.
282
255
*/
283
bool import_key(const char * const filename){
256
bool import_key(const char *filename){
284
257
int ret;
285
258
int fd;
286
259
gpgme_data_t pgp_data;
298
271
return false;
299
272
}
300
273
301
rc = gpgme_op_import(mc->ctx, pgp_data);
274
rc = gpgme_op_import(mc.ctx, pgp_data);
302
275
if(rc != GPG_ERR_NO_ERROR){
303
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
277
gpgme_strsource(rc), gpgme_strerror(rc));
305
278
return false;
306
279
}
307
280
308
ret = close(fd);
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
309
282
if(ret == -1){
310
283
perror_plus("close");
311
284
}
348
321
}
349
322
350
323
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
324
rc = gpgme_new(&(mc.ctx));
352
325
if(rc != GPG_ERR_NO_ERROR){
353
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
367
340
* Decrypt OpenPGP data.
368
341
* Returns -1 on error
369
342
*/
370
__attribute__((nonnull, warn_unused_result))
371
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
344
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
345
char **plaintext){
375
346
gpgme_data_t dh_crypto, dh_plain;
376
347
gpgme_error_t rc;
377
348
ssize_t ret;
403
374
404
375
/* Decrypt data from the cryptotext data buffer to the plaintext
405
376
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
378
if(rc != GPG_ERR_NO_ERROR){
408
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
380
gpgme_strsource(rc), gpgme_strerror(rc));
410
381
plaintext_length = -1;
411
382
if(debug){
412
383
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
384
result = gpgme_op_decrypt_result(mc.ctx);
414
385
if(result == NULL){
415
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
416
387
} else {
493
464
return plaintext_length;
494
465
}
495
466
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);
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;
507
473
}
508
474
509
475
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
476
static void debuggnutls(__attribute__((unused)) int level,
512
477
const char* string){
513
478
fprintf_plus(stderr, "GnuTLS: %s", string);
514
479
}
515
480
516
__attribute__((nonnull(1, 2, 4), warn_unused_result))
517
481
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
482
const char *seckeyfilename){
521
483
int ret;
522
unsigned int uret;
523
484
524
485
if(debug){
525
486
fprintf_plus(stderr, "Initializing GnuTLS\n");
526
487
}
527
488
489
ret = gnutls_global_init();
490
if(ret != GNUTLS_E_SUCCESS){
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
493
return -1;
494
}
495
528
496
if(debug){
529
497
/* "Use a log level over 10 to enable all debugging options."
530
498
* - GnuTLS manual
534
502
}
535
503
536
504
/* OpenPGP credentials */
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
538
506
if(ret != GNUTLS_E_SUCCESS){
539
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
508
safer_gnutls_strerror(ret));
509
gnutls_global_deinit();
541
510
return -1;
542
511
}
543
512
549
518
}
550
519
551
520
ret = gnutls_certificate_set_openpgp_key_file
552
(mc->cred, pubkeyfilename, seckeyfilename,
521
(mc.cred, pubkeyfilename, seckeyfilename,
553
522
GNUTLS_OPENPGP_FMT_BASE64);
554
523
if(ret != GNUTLS_E_SUCCESS){
555
524
fprintf_plus(stderr,
561
530
}
562
531
563
532
/* GnuTLS server initialization */
564
ret = gnutls_dh_params_init(&mc->dh_params);
533
ret = gnutls_dh_params_init(&mc.dh_params);
565
534
if(ret != GNUTLS_E_SUCCESS){
566
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
567
536
" initialization: %s\n",
568
537
safer_gnutls_strerror(ret));
569
538
goto globalfail;
570
539
}
571
/* If a Diffie-Hellman parameters file was given, try to use it */
572
if(dhparamsfilename != NULL){
573
gnutls_datum_t params = { .data = NULL, .size = 0 };
574
do {
575
int dhpfile = open(dhparamsfilename, O_RDONLY);
576
if(dhpfile == -1){
577
perror_plus("open");
578
dhparamsfilename = NULL;
579
break;
580
}
581
size_t params_capacity = 0;
582
while(true){
583
params_capacity = incbuffer((char **)¶ms.data,
584
(size_t)params.size,
585
(size_t)params_capacity);
586
if(params_capacity == 0){
587
perror_plus("incbuffer");
588
free(params.data);
589
params.data = NULL;
590
dhparamsfilename = NULL;
591
break;
592
}
593
ssize_t bytes_read = read(dhpfile,
594
params.data + params.size,
595
BUFFER_SIZE);
596
/* EOF */
597
if(bytes_read == 0){
598
break;
599
}
600
/* check bytes_read for failure */
601
if(bytes_read < 0){
602
perror_plus("read");
603
free(params.data);
604
params.data = NULL;
605
dhparamsfilename = NULL;
606
break;
607
}
608
params.size += (unsigned int)bytes_read;
609
}
610
if(params.data == NULL){
611
dhparamsfilename = NULL;
612
}
613
if(dhparamsfilename == NULL){
614
break;
615
}
616
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
617
GNUTLS_X509_FMT_PEM);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Failed to parse DH parameters in file"
620
" \"%s\": %s\n", dhparamsfilename,
621
safer_gnutls_strerror(ret));
622
dhparamsfilename = NULL;
623
}
624
} while(false);
625
}
626
if(dhparamsfilename == NULL){
627
if(mc->dh_bits == 0){
628
/* Find out the optimal number of DH bits */
629
/* Try to read the private key file */
630
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
631
do {
632
int secfile = open(seckeyfilename, O_RDONLY);
633
if(secfile == -1){
634
perror_plus("open");
635
break;
636
}
637
size_t buffer_capacity = 0;
638
while(true){
639
buffer_capacity = incbuffer((char **)&buffer.data,
640
(size_t)buffer.size,
641
(size_t)buffer_capacity);
642
if(buffer_capacity == 0){
643
perror_plus("incbuffer");
644
free(buffer.data);
645
buffer.data = NULL;
646
break;
647
}
648
ssize_t bytes_read = read(secfile,
649
buffer.data + buffer.size,
650
BUFFER_SIZE);
651
/* EOF */
652
if(bytes_read == 0){
653
break;
654
}
655
/* check bytes_read for failure */
656
if(bytes_read < 0){
657
perror_plus("read");
658
free(buffer.data);
659
buffer.data = NULL;
660
break;
661
}
662
buffer.size += (unsigned int)bytes_read;
663
}
664
close(secfile);
665
} while(false);
666
/* If successful, use buffer to parse private key */
667
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
668
if(buffer.data != NULL){
669
{
670
gnutls_openpgp_privkey_t privkey = NULL;
671
ret = gnutls_openpgp_privkey_init(&privkey);
672
if(ret != GNUTLS_E_SUCCESS){
673
fprintf_plus(stderr, "Error initializing OpenPGP key"
674
" structure: %s",
675
safer_gnutls_strerror(ret));
676
free(buffer.data);
677
buffer.data = NULL;
678
} else {
679
ret = gnutls_openpgp_privkey_import
680
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
681
if(ret != GNUTLS_E_SUCCESS){
682
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
683
safer_gnutls_strerror(ret));
684
privkey = NULL;
685
}
686
free(buffer.data);
687
buffer.data = NULL;
688
if(privkey != NULL){
689
/* Use private key to suggest an appropriate
690
sec_param */
691
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
692
gnutls_openpgp_privkey_deinit(privkey);
693
if(debug){
694
fprintf_plus(stderr, "This OpenPGP key implies using"
695
" a GnuTLS security parameter \"%s\".\n",
696
safe_string(gnutls_sec_param_get_name
697
(sec_param)));
698
}
699
}
700
}
701
}
702
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
703
/* Err on the side of caution */
704
sec_param = GNUTLS_SEC_PARAM_ULTRA;
705
if(debug){
706
fprintf_plus(stderr, "Falling back to security parameter"
707
" \"%s\"\n",
708
safe_string(gnutls_sec_param_get_name
709
(sec_param)));
710
}
711
}
712
}
713
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
714
if(uret != 0){
715
mc->dh_bits = uret;
716
if(debug){
717
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
718
" implies %u DH bits; using that.\n",
719
safe_string(gnutls_sec_param_get_name
720
(sec_param)),
721
mc->dh_bits);
722
}
723
} else {
724
fprintf_plus(stderr, "Failed to get implied number of DH"
725
" bits for security parameter \"%s\"): %s\n",
726
safe_string(gnutls_sec_param_get_name
727
(sec_param)),
728
safer_gnutls_strerror(ret));
729
goto globalfail;
730
}
731
} else if(debug){
732
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
733
mc->dh_bits);
734
}
735
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
736
if(ret != GNUTLS_E_SUCCESS){
737
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
738
" bits): %s\n", mc->dh_bits,
739
safer_gnutls_strerror(ret));
740
goto globalfail;
741
}
742
}
743
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
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);
744
548
745
549
return 0;
746
550
747
551
globalfail:
748
552
749
gnutls_certificate_free_credentials(mc->cred);
750
gnutls_dh_params_deinit(mc->dh_params);
553
gnutls_certificate_free_credentials(mc.cred);
554
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
751
556
return -1;
752
557
}
753
558
754
__attribute__((nonnull, warn_unused_result))
755
static int init_gnutls_session(gnutls_session_t *session,
756
mandos_context *mc){
559
static int init_gnutls_session(gnutls_session_t *session){
757
560
int ret;
758
561
/* GnuTLS session creation */
759
562
do {
771
574
{
772
575
const char *err;
773
576
do {
774
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
775
578
if(quit_now){
776
579
gnutls_deinit(*session);
777
580
return -1;
788
591
789
592
do {
790
593
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
791
mc->cred);
594
mc.cred);
792
595
if(quit_now){
793
596
gnutls_deinit(*session);
794
597
return -1;
804
607
/* ignore client certificate if any. */
805
608
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
806
609
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
611
807
612
return 0;
808
613
}
809
614
811
616
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
812
617
__attribute__((unused)) const char *txt){}
813
618
814
/* Set effective uid to 0, return errno */
815
__attribute__((warn_unused_result))
816
error_t raise_privileges(void){
817
error_t old_errno = errno;
818
error_t ret_errno = 0;
819
if(seteuid(0) == -1){
820
ret_errno = errno;
821
}
822
errno = old_errno;
823
return ret_errno;
824
}
825
826
/* Set effective and real user ID to 0. Return errno. */
827
__attribute__((warn_unused_result))
828
error_t raise_privileges_permanently(void){
829
error_t old_errno = errno;
830
error_t ret_errno = raise_privileges();
831
if(ret_errno != 0){
832
errno = old_errno;
833
return ret_errno;
834
}
835
if(setuid(0) == -1){
836
ret_errno = errno;
837
}
838
errno = old_errno;
839
return ret_errno;
840
}
841
842
/* Set effective user ID to unprivileged saved user ID */
843
__attribute__((warn_unused_result))
844
error_t lower_privileges(void){
845
error_t old_errno = errno;
846
error_t ret_errno = 0;
847
if(seteuid(uid) == -1){
848
ret_errno = errno;
849
}
850
errno = old_errno;
851
return ret_errno;
852
}
853
854
/* Lower privileges permanently */
855
__attribute__((warn_unused_result))
856
error_t lower_privileges_permanently(void){
857
error_t old_errno = errno;
858
error_t ret_errno = 0;
859
if(setuid(uid) == -1){
860
ret_errno = errno;
861
}
862
errno = old_errno;
863
return ret_errno;
864
}
865
866
/* Helper function to add_local_route() and delete_local_route() */
867
__attribute__((nonnull, warn_unused_result))
868
static bool add_delete_local_route(const bool add,
869
const char *address,
870
AvahiIfIndex if_index){
871
int ret;
872
char helper[] = "mandos-client-iprouteadddel";
873
char add_arg[] = "add";
874
char delete_arg[] = "delete";
875
char debug_flag[] = "--debug";
876
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
877
if(pluginhelperdir == NULL){
878
if(debug){
879
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
880
" variable not set; cannot run helper\n");
881
}
882
return false;
883
}
884
885
char interface[IF_NAMESIZE];
886
if(if_indextoname((unsigned int)if_index, interface) == NULL){
887
perror_plus("if_indextoname");
888
return false;
889
}
890
891
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
892
if(devnull == -1){
893
perror_plus("open(\"/dev/null\", O_RDONLY)");
894
return false;
895
}
896
pid_t pid = fork();
897
if(pid == 0){
898
/* Child */
899
/* Raise privileges */
900
errno = raise_privileges_permanently();
901
if(errno != 0){
902
perror_plus("Failed to raise privileges");
903
/* _exit(EX_NOPERM); */
904
} else {
905
/* Set group */
906
errno = 0;
907
ret = setgid(0);
908
if(ret == -1){
909
perror_plus("setgid");
910
_exit(EX_NOPERM);
911
}
912
/* Reset supplementary groups */
913
errno = 0;
914
ret = setgroups(0, NULL);
915
if(ret == -1){
916
perror_plus("setgroups");
917
_exit(EX_NOPERM);
918
}
919
}
920
ret = dup2(devnull, STDIN_FILENO);
921
if(ret == -1){
922
perror_plus("dup2(devnull, STDIN_FILENO)");
923
_exit(EX_OSERR);
924
}
925
ret = close(devnull);
926
if(ret == -1){
927
perror_plus("close");
928
_exit(EX_OSERR);
929
}
930
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
931
if(ret == -1){
932
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
933
_exit(EX_OSERR);
934
}
935
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
936
O_RDONLY
937
| O_DIRECTORY
938
| O_PATH
939
| O_CLOEXEC));
940
if(helperdir_fd == -1){
941
perror_plus("open");
942
_exit(EX_UNAVAILABLE);
943
}
944
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
945
helper, O_RDONLY));
946
if(helper_fd == -1){
947
perror_plus("openat");
948
close(helperdir_fd);
949
_exit(EX_UNAVAILABLE);
950
}
951
close(helperdir_fd);
952
#ifdef __GNUC__
953
#pragma GCC diagnostic push
954
#pragma GCC diagnostic ignored "-Wcast-qual"
955
#endif
956
if(fexecve(helper_fd, (char *const [])
957
{ helper, add ? add_arg : delete_arg, (char *)address,
958
interface, debug ? debug_flag : NULL, NULL },
959
environ) == -1){
960
#ifdef __GNUC__
961
#pragma GCC diagnostic pop
962
#endif
963
perror_plus("fexecve");
964
_exit(EXIT_FAILURE);
965
}
966
}
967
if(pid == -1){
968
perror_plus("fork");
969
return false;
970
}
971
int status;
972
pid_t pret = -1;
973
errno = 0;
974
do {
975
pret = waitpid(pid, &status, 0);
976
if(pret == -1 and errno == EINTR and quit_now){
977
int errno_raising = 0;
978
if((errno = raise_privileges()) != 0){
979
errno_raising = errno;
980
perror_plus("Failed to raise privileges in order to"
981
" kill helper program");
982
}
983
if(kill(pid, SIGTERM) == -1){
984
perror_plus("kill");
985
}
986
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
987
perror_plus("Failed to lower privileges after killing"
988
" helper program");
989
}
990
return false;
991
}
992
} while(pret == -1 and errno == EINTR);
993
if(pret == -1){
994
perror_plus("waitpid");
995
return false;
996
}
997
if(WIFEXITED(status)){
998
if(WEXITSTATUS(status) != 0){
999
fprintf_plus(stderr, "Error: iprouteadddel exited"
1000
" with status %d\n", WEXITSTATUS(status));
1001
return false;
1002
}
1003
return true;
1004
}
1005
if(WIFSIGNALED(status)){
1006
fprintf_plus(stderr, "Error: iprouteadddel died by"
1007
" signal %d\n", WTERMSIG(status));
1008
return false;
1009
}
1010
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1011
return false;
1012
}
1013
1014
__attribute__((nonnull, warn_unused_result))
1015
static bool add_local_route(const char *address,
1016
AvahiIfIndex if_index){
1017
if(debug){
1018
fprintf_plus(stderr, "Adding route to %s\n", address);
1019
}
1020
return add_delete_local_route(true, address, if_index);
1021
}
1022
1023
__attribute__((nonnull, warn_unused_result))
1024
static bool delete_local_route(const char *address,
1025
AvahiIfIndex if_index){
1026
if(debug){
1027
fprintf_plus(stderr, "Removing route to %s\n", address);
1028
}
1029
return add_delete_local_route(false, address, if_index);
1030
}
1031
1032
619
/* Called when a Mandos server is found */
1033
__attribute__((nonnull, warn_unused_result))
1034
static int start_mandos_communication(const char *ip, in_port_t port,
620
static int start_mandos_communication(const char *ip, uint16_t port,
1035
621
AvahiIfIndex if_index,
1036
int af, mandos_context *mc){
622
int af){
1037
623
int ret, tcp_sd = -1;
1038
624
ssize_t sret;
1039
struct sockaddr_storage to;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
1040
629
char *buffer = NULL;
1041
630
char *decrypted_buffer = NULL;
1042
631
size_t buffer_length = 0;
1045
634
int retval = -1;
1046
635
gnutls_session_t session;
1047
636
int pf; /* Protocol family */
1048
bool route_added = false;
1049
637
1050
638
errno = 0;
1051
639
1067
655
return -1;
1068
656
}
1069
657
1070
/* If the interface is specified and we have a list of interfaces */
1071
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1072
/* Check if the interface is one of the interfaces we are using */
1073
bool match = false;
1074
{
1075
char *interface = NULL;
1076
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1077
interface))){
1078
if(if_nametoindex(interface) == (unsigned int)if_index){
1079
match = true;
1080
break;
1081
}
1082
}
1083
}
1084
if(not match){
1085
/* This interface does not match any in the list, so we don't
1086
connect to the server */
1087
if(debug){
1088
char interface[IF_NAMESIZE];
1089
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1090
perror_plus("if_indextoname");
1091
} else {
1092
fprintf_plus(stderr, "Skipping server on non-used interface"
1093
" \"%s\"\n",
1094
if_indextoname((unsigned int)if_index,
1095
interface));
1096
}
1097
}
1098
return -1;
1099
}
1100
}
1101
1102
ret = init_gnutls_session(&session, mc);
658
ret = init_gnutls_session(&session);
1103
659
if(ret != 0){
1104
660
return -1;
1105
661
}
1106
662
1107
663
if(debug){
1108
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1109
PRIuMAX "\n", ip, (uintmax_t)port);
665
PRIu16 "\n", ip, port);
1110
666
}
1111
667
1112
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
1113
669
if(tcp_sd < 0){
1114
670
int e = errno;
1115
671
perror_plus("socket");
1122
678
goto mandos_end;
1123
679
}
1124
680
681
memset(&to, 0, sizeof(to));
1125
682
if(af == AF_INET6){
1126
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1127
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1128
ret = inet_pton(af, ip, &to6->sin6_addr);
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1129
685
} else { /* IPv4 */
1130
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1131
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1132
ret = inet_pton(af, ip, &to4->sin_addr);
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
1133
688
}
1134
689
if(ret < 0 ){
1135
690
int e = errno;
1144
699
goto mandos_end;
1145
700
}
1146
701
if(af == AF_INET6){
1147
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1148
if(IN6_IS_ADDR_LINKLOCAL
1149
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
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*/
1150
709
if(if_index == AVAHI_IF_UNSPEC){
1151
710
fprintf_plus(stderr, "An IPv6 link-local address is"
1152
711
" incomplete without a network interface\n");
1154
713
goto mandos_end;
1155
714
}
1156
715
/* Set the network interface number as scope */
1157
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
716
to.in6.sin6_scope_id = (uint32_t)if_index;
1158
717
}
1159
718
} else {
1160
((struct sockaddr_in *)&to)->sin_port = htons(port);
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
1161
722
}
1162
723
1163
724
if(quit_now){
1171
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1172
733
perror_plus("if_indextoname");
1173
734
} else {
1174
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1175
"\n", ip, interface, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
1176
737
}
1177
738
} else {
1178
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1179
ip, (uintmax_t)port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
1180
741
}
1181
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1182
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1183
if(af == AF_INET6){
1184
ret = getnameinfo((struct sockaddr *)&to,
1185
sizeof(struct sockaddr_in6),
1186
addrstr, sizeof(addrstr), NULL, 0,
1187
NI_NUMERICHOST);
1188
} else {
1189
ret = getnameinfo((struct sockaddr *)&to,
1190
sizeof(struct sockaddr_in),
1191
addrstr, sizeof(addrstr), NULL, 0,
1192
NI_NUMERICHOST);
1193
}
1194
if(ret == EAI_SYSTEM){
1195
perror_plus("getnameinfo");
1196
} else if(ret != 0) {
1197
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1198
} else if(strcmp(addrstr, ip) != 0){
1199
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1200
}
1201
}
1202
1203
if(quit_now){
1204
errno = EINTR;
1205
goto mandos_end;
1206
}
1207
1208
while(true){
1209
if(af == AF_INET6){
1210
ret = connect(tcp_sd, (struct sockaddr *)&to,
1211
sizeof(struct sockaddr_in6));
1212
} else {
1213
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1214
sizeof(struct sockaddr_in));
1215
}
1216
if(ret < 0){
1217
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1218
and if_index != AVAHI_IF_UNSPEC
1219
and connect_to == NULL
1220
and not route_added and
1221
((af == AF_INET6 and not
1222
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1223
&to)->sin6_addr)))
1224
or (af == AF_INET and
1225
/* Not a a IPv4LL address */
1226
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1227
& 0xFFFF0000L) != 0xA9FE0000L))){
1228
/* Work around Avahi bug - Avahi does not announce link-local
1229
addresses if it has a global address, so local hosts with
1230
*only* a link-local address (e.g. Mandos clients) cannot
1231
connect to a Mandos server announced by Avahi on a server
1232
host with a global address. Work around this by retrying
1233
with an explicit route added with the server's address.
1234
1235
Avahi bug reference:
1236
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1237
https://bugs.debian.org/587961
1238
*/
1239
if(debug){
1240
fprintf_plus(stderr, "Mandos server unreachable, trying"
1241
" direct route\n");
1242
}
1243
int e = errno;
1244
route_added = add_local_route(ip, if_index);
1245
if(route_added){
1246
continue;
1247
}
1248
errno = e;
1249
}
1250
if(errno != ECONNREFUSED or debug){
1251
int e = errno;
1252
perror_plus("connect");
1253
errno = e;
1254
}
1255
goto mandos_end;
1256
}
1257
1258
if(quit_now){
1259
errno = EINTR;
1260
goto mandos_end;
1261
}
1262
break;
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;
1263
783
}
1264
784
1265
785
const char *out = mandos_protocol_version;
1416
936
if(buffer_length > 0){
1417
937
ssize_t decrypted_buffer_size;
1418
938
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1419
&decrypted_buffer, mc);
939
&decrypted_buffer);
1420
940
if(decrypted_buffer_size >= 0){
1421
941
1422
942
written = 0;
1448
968
1449
969
mandos_end:
1450
970
{
1451
if(route_added){
1452
if(not delete_local_route(ip, if_index)){
1453
fprintf_plus(stderr, "Failed to delete local route to %s on"
1454
" interface %d", ip, if_index);
1455
}
1456
}
1457
971
int e = errno;
1458
972
free(decrypted_buffer);
1459
973
free(buffer);
1460
974
if(tcp_sd >= 0){
1461
ret = close(tcp_sd);
975
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1462
976
}
1463
977
if(ret == -1){
1464
978
if(e == 0){
1476
990
return retval;
1477
991
}
1478
992
1479
__attribute__((nonnull))
1480
993
static void resolve_callback(AvahiSServiceResolver *r,
1481
994
AvahiIfIndex interface,
1482
995
AvahiProtocol proto,
1490
1003
AVAHI_GCC_UNUSED AvahiStringList *txt,
1491
1004
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1492
1005
flags,
1493
void *mc){
1494
if(r == NULL){
1495
return;
1496
}
1006
AVAHI_GCC_UNUSED void* userdata){
1007
assert(r);
1497
1008
1498
1009
/* Called whenever a service has been resolved successfully or
1499
1010
timed out */
1500
1011
1501
1012
if(quit_now){
1502
avahi_s_service_resolver_free(r);
1503
1013
return;
1504
1014
}
1505
1015
1509
1019
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1510
1020
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1511
1021
domain,
1512
avahi_strerror(avahi_server_errno
1513
(((mandos_context*)mc)->server)));
1022
avahi_strerror(avahi_server_errno(mc.server)));
1514
1023
break;
1515
1024
1516
1025
case AVAHI_RESOLVER_FOUND:
1522
1031
PRIdMAX ") on port %" PRIu16 "\n", name,
1523
1032
host_name, ip, (intmax_t)interface, port);
1524
1033
}
1525
int ret = start_mandos_communication(ip, (in_port_t)port,
1526
interface,
1527
avahi_proto_to_af(proto),
1528
mc);
1034
int ret = start_mandos_communication(ip, port, interface,
1035
avahi_proto_to_af(proto));
1529
1036
if(ret == 0){
1530
avahi_simple_poll_quit(simple_poll);
1037
avahi_simple_poll_quit(mc.simple_poll);
1531
1038
} else {
1532
if(not add_server(ip, (in_port_t)port, interface,
1533
avahi_proto_to_af(proto),
1534
&((mandos_context*)mc)->current_server)){
1039
if(not add_server(ip, port, interface,
1040
avahi_proto_to_af(proto))){
1535
1041
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1536
1042
" list\n", name);
1537
1043
}
1550
1056
const char *domain,
1551
1057
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1552
1058
flags,
1553
void *mc){
1554
if(b == NULL){
1555
return;
1556
}
1059
AVAHI_GCC_UNUSED void* userdata){
1060
assert(b);
1557
1061
1558
1062
/* Called whenever a new services becomes available on the LAN or
1559
1063
is removed from the LAN */
1567
1071
case AVAHI_BROWSER_FAILURE:
1568
1072
1569
1073
fprintf_plus(stderr, "(Avahi browser) %s\n",
1570
avahi_strerror(avahi_server_errno
1571
(((mandos_context*)mc)->server)));
1572
avahi_simple_poll_quit(simple_poll);
1074
avahi_strerror(avahi_server_errno(mc.server)));
1075
avahi_simple_poll_quit(mc.simple_poll);
1573
1076
return;
1574
1077
1575
1078
case AVAHI_BROWSER_NEW:
1578
1081
the callback function is called the Avahi server will free the
1579
1082
resolver for us. */
1580
1083
1581
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1582
interface, protocol, name, type,
1583
domain, protocol, 0,
1584
resolve_callback, mc) == NULL)
1084
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1085
name, type, domain, protocol, 0,
1086
resolve_callback, NULL) == NULL)
1585
1087
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1586
1088
" %s\n", name,
1587
avahi_strerror(avahi_server_errno
1588
(((mandos_context*)mc)->server)));
1089
avahi_strerror(avahi_server_errno(mc.server)));
1589
1090
break;
1590
1091
1591
1092
case AVAHI_BROWSER_REMOVE:
1610
1111
signal_received = sig;
1611
1112
int old_errno = errno;
1612
1113
/* set main loop to exit */
1613
if(simple_poll != NULL){
1614
avahi_simple_poll_quit(simple_poll);
1114
if(mc.simple_poll != NULL){
1115
avahi_simple_poll_quit(mc.simple_poll);
1615
1116
}
1616
1117
errno = old_errno;
1617
1118
}
1618
1119
1619
__attribute__((nonnull, warn_unused_result))
1620
1120
bool get_flags(const char *ifname, struct ifreq *ifr){
1621
1121
int ret;
1622
error_t ret_errno;
1623
1122
1624
1123
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1625
1124
if(s < 0){
1626
ret_errno = errno;
1627
1125
perror_plus("socket");
1628
errno = ret_errno;
1629
1126
return false;
1630
1127
}
1631
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1632
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1128
strcpy(ifr->ifr_name, ifname);
1633
1129
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1634
1130
if(ret == -1){
1635
1131
if(debug){
1636
ret_errno = errno;
1637
1132
perror_plus("ioctl SIOCGIFFLAGS");
1638
errno = ret_errno;
1639
1133
}
1640
1134
return false;
1641
1135
}
1642
1136
return true;
1643
1137
}
1644
1138
1645
__attribute__((nonnull, warn_unused_result))
1646
1139
bool good_flags(const char *ifname, const struct ifreq *ifr){
1647
1140
1648
1141
/* Reject the loopback device */
1690
1183
* corresponds to an acceptable network device.
1691
1184
* (This function is passed to scandir(3) as a filter function.)
1692
1185
*/
1693
__attribute__((nonnull, warn_unused_result))
1694
1186
int good_interface(const struct dirent *if_entry){
1695
1187
if(if_entry->d_name[0] == '.'){
1696
1188
return 0;
1712
1204
}
1713
1205
1714
1206
/*
1715
* This function determines if a network interface is up.
1716
*/
1717
__attribute__((nonnull, warn_unused_result))
1718
bool interface_is_up(const char *interface){
1719
struct ifreq ifr;
1720
if(not get_flags(interface, &ifr)){
1721
if(debug){
1722
fprintf_plus(stderr, "Failed to get flags for interface "
1723
"\"%s\"\n", interface);
1724
}
1725
return false;
1726
}
1727
1728
return (bool)(ifr.ifr_flags & IFF_UP);
1729
}
1730
1731
/*
1732
* This function determines if a network interface is running
1733
*/
1734
__attribute__((nonnull, warn_unused_result))
1735
bool interface_is_running(const char *interface){
1736
struct ifreq ifr;
1737
if(not get_flags(interface, &ifr)){
1738
if(debug){
1739
fprintf_plus(stderr, "Failed to get flags for interface "
1740
"\"%s\"\n", interface);
1741
}
1742
return false;
1743
}
1744
1745
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1746
}
1747
1748
__attribute__((nonnull, pure, warn_unused_result))
1207
* This function determines if a directory entry in /sys/class/net
1208
* corresponds to an acceptable network device which is up.
1209
* (This function is passed to scandir(3) as a filter function.)
1210
*/
1211
int up_interface(const struct dirent *if_entry){
1212
if(if_entry->d_name[0] == '.'){
1213
return 0;
1214
}
1215
1216
struct ifreq ifr;
1217
if(not get_flags(if_entry->d_name, &ifr)){
1218
if(debug){
1219
fprintf_plus(stderr, "Failed to get flags for interface "
1220
"\"%s\"\n", if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject down interfaces */
1226
if(not (ifr.ifr_flags & IFF_UP)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
/* Reject non-running interfaces */
1235
if(not (ifr.ifr_flags & IFF_RUNNING)){
1236
if(debug){
1237
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
if(not good_flags(if_entry->d_name, &ifr)){
1244
return 0;
1245
}
1246
return 1;
1247
}
1248
1749
1249
int notdotentries(const struct dirent *direntry){
1750
1250
/* Skip "." and ".." */
1751
1251
if(direntry->d_name[0] == '.'
1758
1258
}
1759
1259
1760
1260
/* Is this directory entry a runnable program? */
1761
__attribute__((nonnull, warn_unused_result))
1762
1261
int runnable_hook(const struct dirent *direntry){
1763
1262
int ret;
1764
1263
size_t sret;
1772
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1773
1272
"abcdefghijklmnopqrstuvwxyz"
1774
1273
"0123456789"
1775
"_.-");
1274
"_-");
1776
1275
if((direntry->d_name)[sret] != '\0'){
1777
1276
/* Contains non-allowed characters */
1778
1277
if(debug){
1782
1281
return 0;
1783
1282
}
1784
1283
1785
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1786
1292
if(ret == -1){
1787
1293
if(debug){
1788
1294
perror_plus("Could not stat hook");
1812
1318
return 1;
1813
1319
}
1814
1320
1815
__attribute__((nonnull, warn_unused_result))
1816
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1817
mandos_context *mc){
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1818
1322
int ret;
1819
1323
struct timespec now;
1820
1324
struct timespec waited_time;
1821
1325
intmax_t block_time;
1822
1326
1823
1327
while(true){
1824
if(mc->current_server == NULL){
1825
if(debug){
1328
if(mc.current_server == NULL){
1329
if (debug){
1826
1330
fprintf_plus(stderr, "Wait until first server is found."
1827
1331
" No timeout!\n");
1828
1332
}
1829
1333
ret = avahi_simple_poll_iterate(s, -1);
1830
1334
} else {
1831
if(debug){
1335
if (debug){
1832
1336
fprintf_plus(stderr, "Check current_server if we should run"
1833
1337
" it, or wait\n");
1834
1338
}
1841
1345
/* Calculating in ms how long time between now and server
1842
1346
who we visted longest time ago. Now - last seen. */
1843
1347
waited_time.tv_sec = (now.tv_sec
1844
- mc->current_server->last_seen.tv_sec);
1348
- mc.current_server->last_seen.tv_sec);
1845
1349
waited_time.tv_nsec = (now.tv_nsec
1846
- mc->current_server->last_seen.tv_nsec);
1350
- mc.current_server->last_seen.tv_nsec);
1847
1351
/* total time is 10s/10,000ms.
1848
1352
Converting to s from ms by dividing by 1,000,
1849
1353
and ns to ms by dividing by 1,000,000. */
1851
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1852
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1853
1357
1854
if(debug){
1358
if (debug){
1855
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1856
1360
block_time);
1857
1361
}
1858
1362
1859
1363
if(block_time <= 0){
1860
ret = start_mandos_communication(mc->current_server->ip,
1861
mc->current_server->port,
1862
mc->current_server->if_index,
1863
mc->current_server->af, mc);
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1864
1368
if(ret == 0){
1865
avahi_simple_poll_quit(s);
1369
avahi_simple_poll_quit(mc.simple_poll);
1866
1370
return 0;
1867
1371
}
1868
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1869
&mc->current_server->last_seen);
1373
&mc.current_server->last_seen);
1870
1374
if(ret == -1){
1871
1375
perror_plus("clock_gettime");
1872
1376
return -1;
1873
1377
}
1874
mc->current_server = mc->current_server->next;
1378
mc.current_server = mc.current_server->next;
1875
1379
block_time = 0; /* Call avahi to find new Mandos
1876
1380
servers, but don't block */
1877
1381
}
1879
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1880
1384
}
1881
1385
if(ret != 0){
1882
if(ret > 0 or errno != EINTR){
1386
if (ret > 0 or errno != EINTR){
1883
1387
return (ret != 1) ? ret : 0;
1884
1388
}
1885
1389
}
1886
1390
}
1887
1391
}
1888
1392
1889
__attribute__((nonnull))
1890
void run_network_hooks(const char *mode, const char *interface,
1393
bool run_network_hooks(const char *mode, const char *interface,
1891
1394
const float delay){
1892
struct dirent **direntries = NULL;
1893
if(hookdir_fd == -1){
1894
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1895
| O_CLOEXEC);
1896
if(hookdir_fd == -1){
1897
if(errno == ENOENT){
1898
if(debug){
1899
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1900
" found\n", hookdir);
1901
}
1902
} else {
1903
perror_plus("open");
1904
}
1905
return;
1906
}
1907
}
1908
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1909
runnable_hook, alphasort);
1395
struct dirent **direntries;
1396
struct dirent *direntry;
1397
int ret;
1398
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1399
alphasort);
1910
1400
if(numhooks == -1){
1911
1401
perror_plus("scandir");
1912
return;
1913
}
1914
struct dirent *direntry;
1915
int ret;
1916
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1917
if(devnull == -1){
1918
perror_plus("open(\"/dev/null\", O_RDONLY)");
1919
return;
1920
}
1921
for(int i = 0; i < numhooks; i++){
1922
direntry = direntries[i];
1923
if(debug){
1924
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1925
direntry->d_name);
1926
}
1927
pid_t hook_pid = fork();
1928
if(hook_pid == 0){
1929
/* Child */
1930
/* Raise privileges */
1931
errno = raise_privileges_permanently();
1932
if(errno != 0){
1933
perror_plus("Failed to raise privileges");
1934
_exit(EX_NOPERM);
1935
}
1936
/* Set group */
1937
errno = 0;
1938
ret = setgid(0);
1939
if(ret == -1){
1940
perror_plus("setgid");
1941
_exit(EX_NOPERM);
1942
}
1943
/* Reset supplementary groups */
1944
errno = 0;
1945
ret = setgroups(0, NULL);
1946
if(ret == -1){
1947
perror_plus("setgroups");
1948
_exit(EX_NOPERM);
1949
}
1950
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1951
if(ret == -1){
1952
perror_plus("setenv");
1953
_exit(EX_OSERR);
1954
}
1955
ret = setenv("DEVICE", interface, 1);
1956
if(ret == -1){
1957
perror_plus("setenv");
1958
_exit(EX_OSERR);
1959
}
1960
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1961
if(ret == -1){
1962
perror_plus("setenv");
1963
_exit(EX_OSERR);
1964
}
1965
ret = setenv("MODE", mode, 1);
1966
if(ret == -1){
1967
perror_plus("setenv");
1968
_exit(EX_OSERR);
1969
}
1970
char *delaystring;
1971
ret = asprintf(&delaystring, "%f", (double)delay);
1972
if(ret == -1){
1402
} else {
1403
int devnull = open("/dev/null", O_RDONLY);
1404
for(int i = 0; i < numhooks; i++){
1405
direntry = direntries[i];
1406
char *fullname = NULL;
1407
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1408
if(ret < 0){
1973
1409
perror_plus("asprintf");
1974
_exit(EX_OSERR);
1975
}
1976
ret = setenv("DELAY", delaystring, 1);
1977
if(ret == -1){
1410
continue;
1411
}
1412
if(debug){
1413
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1414
direntry->d_name);
1415
}
1416
pid_t hook_pid = fork();
1417
if(hook_pid == 0){
1418
/* Child */
1419
/* Raise privileges */
1420
errno = 0;
1421
ret = seteuid(0);
1422
if(ret == -1){
1423
perror_plus("seteuid");
1424
}
1425
/* Raise privileges even more */
1426
errno = 0;
1427
ret = setuid(0);
1428
if(ret == -1){
1429
perror_plus("setuid");
1430
}
1431
/* Set group */
1432
errno = 0;
1433
ret = setgid(0);
1434
if(ret == -1){
1435
perror_plus("setgid");
1436
}
1437
/* Reset supplementary groups */
1438
errno = 0;
1439
ret = setgroups(0, NULL);
1440
if(ret == -1){
1441
perror_plus("setgroups");
1442
}
1443
dup2(devnull, STDIN_FILENO);
1444
close(devnull);
1445
dup2(STDERR_FILENO, STDOUT_FILENO);
1446
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("DEVICE", interface, 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
ret = setenv("MODE", mode, 1);
1462
if(ret == -1){
1463
perror_plus("setenv");
1464
_exit(EX_OSERR);
1465
}
1466
char *delaystring;
1467
ret = asprintf(&delaystring, "%f", delay);
1468
if(ret == -1){
1469
perror_plus("asprintf");
1470
_exit(EX_OSERR);
1471
}
1472
ret = setenv("DELAY", delaystring, 1);
1473
if(ret == -1){
1474
free(delaystring);
1475
perror_plus("setenv");
1476
_exit(EX_OSERR);
1477
}
1978
1478
free(delaystring);
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
free(delaystring);
1983
if(connect_to != NULL){
1984
ret = setenv("CONNECT", connect_to, 1);
1985
if(ret == -1){
1986
perror_plus("setenv");
1987
_exit(EX_OSERR);
1988
}
1989
}
1990
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1991
direntry->d_name,
1992
O_RDONLY));
1993
if(hook_fd == -1){
1994
perror_plus("openat");
1995
_exit(EXIT_FAILURE);
1996
}
1997
if(close(hookdir_fd) == -1){
1998
perror_plus("close");
1999
_exit(EXIT_FAILURE);
2000
}
2001
ret = dup2(devnull, STDIN_FILENO);
2002
if(ret == -1){
2003
perror_plus("dup2(devnull, STDIN_FILENO)");
2004
_exit(EX_OSERR);
2005
}
2006
ret = close(devnull);
2007
if(ret == -1){
2008
perror_plus("close");
2009
_exit(EX_OSERR);
2010
}
2011
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2012
if(ret == -1){
2013
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2014
_exit(EX_OSERR);
2015
}
2016
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2017
environ) == -1){
2018
perror_plus("fexecve");
2019
_exit(EXIT_FAILURE);
2020
}
2021
} else {
2022
if(hook_pid == -1){
2023
perror_plus("fork");
2024
free(direntry);
2025
continue;
2026
}
2027
int status;
2028
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2029
perror_plus("waitpid");
2030
free(direntry);
2031
continue;
2032
}
2033
if(WIFEXITED(status)){
2034
if(WEXITSTATUS(status) != 0){
2035
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2036
" with status %d\n", direntry->d_name,
2037
WEXITSTATUS(status));
2038
free(direntry);
2039
continue;
2040
}
2041
} else if(WIFSIGNALED(status)){
2042
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2043
" signal %d\n", direntry->d_name,
2044
WTERMSIG(status));
2045
free(direntry);
2046
continue;
2047
} else {
2048
fprintf_plus(stderr, "Warning: network hook \"%s\""
2049
" crashed\n", direntry->d_name);
2050
free(direntry);
2051
continue;
2052
}
2053
}
2054
if(debug){
2055
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2056
direntry->d_name);
2057
}
2058
free(direntry);
2059
}
2060
free(direntries);
2061
if(close(hookdir_fd) == -1){
2062
perror_plus("close");
2063
} else {
2064
hookdir_fd = -1;
2065
}
2066
close(devnull);
2067
}
2068
2069
__attribute__((nonnull, warn_unused_result))
2070
error_t bring_up_interface(const char *const interface,
2071
const float delay){
2072
error_t old_errno = errno;
2073
int ret;
2074
struct ifreq network;
2075
unsigned int if_index = if_nametoindex(interface);
2076
if(if_index == 0){
2077
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2078
errno = old_errno;
2079
return ENXIO;
2080
}
2081
2082
if(quit_now){
2083
errno = old_errno;
2084
return EINTR;
2085
}
2086
2087
if(not interface_is_up(interface)){
2088
error_t ret_errno = 0, ioctl_errno = 0;
2089
if(not get_flags(interface, &network)){
2090
ret_errno = errno;
2091
fprintf_plus(stderr, "Failed to get flags for interface "
2092
"\"%s\"\n", interface);
2093
errno = old_errno;
2094
return ret_errno;
2095
}
2096
network.ifr_flags |= IFF_UP; /* set flag */
2097
2098
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2099
if(sd == -1){
2100
ret_errno = errno;
2101
perror_plus("socket");
2102
errno = old_errno;
2103
return ret_errno;
2104
}
2105
2106
if(quit_now){
2107
ret = close(sd);
2108
if(ret == -1){
2109
perror_plus("close");
2110
}
2111
errno = old_errno;
2112
return EINTR;
2113
}
2114
2115
if(debug){
2116
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2117
interface);
2118
}
2119
2120
/* Raise privileges */
2121
ret_errno = raise_privileges();
2122
if(ret_errno != 0){
2123
errno = ret_errno;
2124
perror_plus("Failed to raise privileges");
2125
}
2126
2127
#ifdef __linux__
2128
int ret_linux;
2129
bool restore_loglevel = false;
2130
if(ret_errno == 0){
2131
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2132
messages about the network interface to mess up the prompt */
2133
ret_linux = klogctl(8, NULL, 5);
2134
if(ret_linux == -1){
2135
perror_plus("klogctl");
2136
} else {
2137
restore_loglevel = true;
2138
}
2139
}
2140
#endif /* __linux__ */
2141
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2142
ioctl_errno = errno;
2143
#ifdef __linux__
2144
if(restore_loglevel){
2145
ret_linux = klogctl(7, NULL, 0);
2146
if(ret_linux == -1){
2147
perror_plus("klogctl");
2148
}
2149
}
2150
#endif /* __linux__ */
2151
2152
/* If raise_privileges() succeeded above */
2153
if(ret_errno == 0){
2154
/* Lower privileges */
2155
ret_errno = lower_privileges();
2156
if(ret_errno != 0){
2157
errno = ret_errno;
2158
perror_plus("Failed to lower privileges");
2159
}
2160
}
2161
2162
/* Close the socket */
2163
ret = close(sd);
2164
if(ret == -1){
2165
perror_plus("close");
2166
}
2167
2168
if(ret_setflags == -1){
2169
errno = ioctl_errno;
2170
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2171
errno = old_errno;
2172
return ioctl_errno;
2173
}
2174
} else if(debug){
2175
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2176
interface);
2177
}
2178
2179
/* Sleep checking until interface is running.
2180
Check every 0.25s, up to total time of delay */
2181
for(int i=0; i < delay * 4; i++){
2182
if(interface_is_running(interface)){
2183
break;
2184
}
2185
struct timespec sleeptime = { .tv_nsec = 250000000 };
2186
ret = nanosleep(&sleeptime, NULL);
2187
if(ret == -1 and errno != EINTR){
2188
perror_plus("nanosleep");
2189
}
2190
}
2191
2192
errno = old_errno;
2193
return 0;
2194
}
2195
2196
__attribute__((nonnull, warn_unused_result))
2197
error_t take_down_interface(const char *const interface){
2198
error_t old_errno = errno;
2199
struct ifreq network;
2200
unsigned int if_index = if_nametoindex(interface);
2201
if(if_index == 0){
2202
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2203
errno = old_errno;
2204
return ENXIO;
2205
}
2206
if(interface_is_up(interface)){
2207
error_t ret_errno = 0, ioctl_errno = 0;
2208
if(not get_flags(interface, &network) and debug){
2209
ret_errno = errno;
2210
fprintf_plus(stderr, "Failed to get flags for interface "
2211
"\"%s\"\n", interface);
2212
errno = old_errno;
2213
return ret_errno;
2214
}
2215
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2216
2217
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2218
if(sd == -1){
2219
ret_errno = errno;
2220
perror_plus("socket");
2221
errno = old_errno;
2222
return ret_errno;
2223
}
2224
2225
if(debug){
2226
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2227
interface);
2228
}
2229
2230
/* Raise privileges */
2231
ret_errno = raise_privileges();
2232
if(ret_errno != 0){
2233
errno = ret_errno;
2234
perror_plus("Failed to raise privileges");
2235
}
2236
2237
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2238
ioctl_errno = errno;
2239
2240
/* If raise_privileges() succeeded above */
2241
if(ret_errno == 0){
2242
/* Lower privileges */
2243
ret_errno = lower_privileges();
2244
if(ret_errno != 0){
2245
errno = ret_errno;
2246
perror_plus("Failed to lower privileges");
2247
}
2248
}
2249
2250
/* Close the socket */
2251
int ret = close(sd);
2252
if(ret == -1){
2253
perror_plus("close");
2254
}
2255
2256
if(ret_setflags == -1){
2257
errno = ioctl_errno;
2258
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2259
errno = old_errno;
2260
return ioctl_errno;
2261
}
2262
} else if(debug){
2263
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2264
interface);
2265
}
2266
2267
errno = old_errno;
2268
return 0;
1479
if(connect_to != NULL){
1480
ret = setenv("CONNECT", connect_to, 1);
1481
if(ret == -1){
1482
perror_plus("setenv");
1483
_exit(EX_OSERR);
1484
}
1485
}
1486
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1487
perror_plus("execl");
1488
_exit(EXIT_FAILURE);
1489
}
1490
} else {
1491
int status;
1492
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1493
perror_plus("waitpid");
1494
free(fullname);
1495
continue;
1496
}
1497
if(WIFEXITED(status)){
1498
if(WEXITSTATUS(status) != 0){
1499
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1500
" with status %d\n", direntry->d_name,
1501
WEXITSTATUS(status));
1502
free(fullname);
1503
continue;
1504
}
1505
} else if(WIFSIGNALED(status)){
1506
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1507
" signal %d\n", direntry->d_name,
1508
WTERMSIG(status));
1509
free(fullname);
1510
continue;
1511
} else {
1512
fprintf_plus(stderr, "Warning: network hook \"%s\""
1513
" crashed\n", direntry->d_name);
1514
free(fullname);
1515
continue;
1516
}
1517
}
1518
free(fullname);
1519
if(debug){
1520
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1521
direntry->d_name);
1522
}
1523
}
1524
close(devnull);
1525
}
1526
return true;
2269
1527
}
2270
1528
2271
1529
int main(int argc, char *argv[]){
2272
mandos_context mc = { .server = NULL, .dh_bits = 0,
2273
.priority = "SECURE256:!CTYPE-X.509"
2274
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2275
.current_server = NULL, .interfaces = NULL,
2276
.interfaces_size = 0 };
2277
1530
AvahiSServiceBrowser *sb = NULL;
2278
error_t ret_errno;
1531
int error;
2279
1532
int ret;
2280
1533
intmax_t tmpmax;
2281
1534
char *tmp;
2282
1535
int exitcode = EXIT_SUCCESS;
2283
char *interfaces_to_take_down = NULL;
2284
size_t interfaces_to_take_down_size = 0;
2285
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2286
char old_tempdir[] = "/tmp/mandosXXXXXX";
2287
char *tempdir = NULL;
1536
const char *interface = "";
1537
struct ifreq network;
1538
int sd = -1;
1539
bool take_down_interface = false;
1540
uid_t uid;
1541
gid_t gid;
1542
char tempdir[] = "/tmp/mandosXXXXXX";
1543
bool tempdir_created = false;
2288
1544
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2289
1545
const char *seckey = PATHDIR "/" SECKEY;
2290
1546
const char *pubkey = PATHDIR "/" PUBKEY;
2291
const char *dh_params_file = NULL;
2292
char *interfaces_hooks = NULL;
2293
1547
2294
1548
bool gnutls_initialized = false;
2295
1549
bool gpgme_initialized = false;
2347
1601
.doc = "Bit length of the prime number used in the"
2348
1602
" Diffie-Hellman key exchange",
2349
1603
.group = 2 },
2350
{ .name = "dh-params", .key = 134,
2351
.arg = "FILE",
2352
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2353
" for the Diffie-Hellman key exchange",
2354
.group = 2 },
2355
1604
{ .name = "priority", .key = 130,
2356
1605
.arg = "STRING",
2357
1606
.doc = "GnuTLS priority string for the TLS handshake",
2391
1640
connect_to = arg;
2392
1641
break;
2393
1642
case 'i': /* --interface */
2394
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2395
arg, (int)',');
2396
if(ret_errno != 0){
2397
argp_error(state, "%s", strerror(ret_errno));
2398
}
1643
interface = arg;
2399
1644
break;
2400
1645
case 's': /* --seckey */
2401
1646
seckey = arg;
2412
1657
}
2413
1658
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2414
1659
break;
2415
case 134: /* --dh-params */
2416
dh_params_file = arg;
2417
break;
2418
1660
case 130: /* --priority */
2419
1661
mc.priority = arg;
2420
1662
break;
2476
1718
goto end;
2477
1719
}
2478
1720
}
2479
1721
2480
1722
{
2481
1723
/* Work around Debian bug #633582:
2482
1724
<http://bugs.debian.org/633582> */
2483
1725
2484
/* Re-raise privileges */
2485
ret_errno = raise_privileges();
2486
if(ret_errno != 0){
2487
errno = ret_errno;
2488
perror_plus("Failed to raise privileges");
1726
/* Re-raise priviliges */
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror_plus("seteuid");
2489
1731
} else {
2490
1732
struct stat st;
2491
1733
2506
1748
}
2507
1749
}
2508
1750
}
2509
close(seckey_fd);
1751
TEMP_FAILURE_RETRY(close(seckey_fd));
2510
1752
}
2511
1753
}
2512
1754
2513
1755
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2514
1756
int pubkey_fd = open(pubkey, O_RDONLY);
2515
1757
if(pubkey_fd == -1){
2527
1769
}
2528
1770
}
2529
1771
}
2530
close(pubkey_fd);
2531
}
2532
}
2533
2534
if(dh_params_file != NULL
2535
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2536
int dhparams_fd = open(dh_params_file, O_RDONLY);
2537
if(dhparams_fd == -1){
2538
perror_plus("open");
2539
} else {
2540
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2541
if(ret == -1){
2542
perror_plus("fstat");
2543
} else {
2544
if(S_ISREG(st.st_mode)
2545
and st.st_uid == 0 and st.st_gid == 0){
2546
ret = fchown(dhparams_fd, uid, gid);
2547
if(ret == -1){
2548
perror_plus("fchown");
2549
}
2550
}
2551
}
2552
close(dhparams_fd);
2553
}
2554
}
2555
1772
TEMP_FAILURE_RETRY(close(pubkey_fd));
1773
}
1774
}
1775
2556
1776
/* Lower privileges */
2557
ret_errno = lower_privileges();
2558
if(ret_errno != 0){
2559
errno = ret_errno;
2560
perror_plus("Failed to lower privileges");
2561
}
2562
}
2563
}
2564
2565
/* Remove invalid interface names (except "none") */
2566
{
2567
char *interface = NULL;
2568
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2569
interface))){
2570
if(strcmp(interface, "none") != 0
2571
and if_nametoindex(interface) == 0){
2572
if(interface[0] != '\0'){
2573
fprintf_plus(stderr, "Not using nonexisting interface"
2574
" \"%s\"\n", interface);
2575
}
2576
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2577
interface = NULL;
1777
errno = 0;
1778
ret = seteuid(uid);
1779
if(ret == -1){
1780
perror_plus("seteuid");
2578
1781
}
2579
1782
}
2580
1783
}
2581
1784
2582
1785
/* Run network hooks */
2583
{
2584
if(mc.interfaces != NULL){
2585
interfaces_hooks = malloc(mc.interfaces_size);
2586
if(interfaces_hooks == NULL){
2587
perror_plus("malloc");
2588
goto end;
2589
}
2590
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2591
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2592
}
2593
run_network_hooks("start", interfaces_hooks != NULL ?
2594
interfaces_hooks : "", delay);
1786
if(not run_network_hooks("start", interface, delay)){
1787
goto end;
2595
1788
}
2596
1789
2597
1790
if(not debug){
2598
1791
avahi_set_log_function(empty_log);
2599
1792
}
2600
1793
1794
if(interface[0] == '\0'){
1795
struct dirent **direntries;
1796
/* First look for interfaces that are up */
1797
ret = scandir(sys_class_net, &direntries, up_interface,
1798
alphasort);
1799
if(ret == 0){
1800
/* No up interfaces, look for any good interfaces */
1801
free(direntries);
1802
ret = scandir(sys_class_net, &direntries, good_interface,
1803
alphasort);
1804
}
1805
if(ret >= 1){
1806
/* Pick the first interface returned */
1807
interface = strdup(direntries[0]->d_name);
1808
if(debug){
1809
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1810
}
1811
if(interface == NULL){
1812
perror_plus("malloc");
1813
free(direntries);
1814
exitcode = EXIT_FAILURE;
1815
goto end;
1816
}
1817
free(direntries);
1818
} else {
1819
free(direntries);
1820
fprintf_plus(stderr, "Could not find a network interface\n");
1821
exitcode = EXIT_FAILURE;
1822
goto end;
1823
}
1824
}
1825
2601
1826
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2602
1827
from the signal handler */
2603
1828
/* Initialize the pseudo-RNG for Avahi */
2604
1829
srand((unsigned int) time(NULL));
2605
simple_poll = avahi_simple_poll_new();
2606
if(simple_poll == NULL){
1830
mc.simple_poll = avahi_simple_poll_new();
1831
if(mc.simple_poll == NULL){
2607
1832
fprintf_plus(stderr,
2608
1833
"Avahi: Failed to create simple poll object.\n");
2609
1834
exitcode = EX_UNAVAILABLE;
2673
1898
}
2674
1899
}
2675
1900
2676
/* If no interfaces were specified, make a list */
2677
if(mc.interfaces == NULL){
2678
struct dirent **direntries = NULL;
2679
/* Look for any good interfaces */
2680
ret = scandir(sys_class_net, &direntries, good_interface,
2681
alphasort);
2682
if(ret >= 1){
2683
/* Add all found interfaces to interfaces list */
2684
for(int i = 0; i < ret; ++i){
2685
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2686
direntries[i]->d_name);
2687
if(ret_errno != 0){
2688
errno = ret_errno;
2689
perror_plus("argz_add");
2690
free(direntries[i]);
2691
continue;
2692
}
2693
if(debug){
2694
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2695
direntries[i]->d_name);
2696
}
2697
free(direntries[i]);
2698
}
2699
free(direntries);
2700
} else {
2701
if(ret == 0){
2702
free(direntries);
2703
}
2704
fprintf_plus(stderr, "Could not find a network interface\n");
2705
exitcode = EXIT_FAILURE;
2706
goto end;
2707
}
2708
}
2709
2710
/* Bring up interfaces which are down, and remove any "none"s */
2711
{
2712
char *interface = NULL;
2713
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2714
interface))){
2715
/* If interface name is "none", stop bringing up interfaces.
2716
Also remove all instances of "none" from the list */
2717
if(strcmp(interface, "none") == 0){
2718
argz_delete(&mc.interfaces, &mc.interfaces_size,
2719
interface);
2720
interface = NULL;
2721
while((interface = argz_next(mc.interfaces,
2722
mc.interfaces_size, interface))){
2723
if(strcmp(interface, "none") == 0){
2724
argz_delete(&mc.interfaces, &mc.interfaces_size,
2725
interface);
2726
interface = NULL;
1901
/* If the interface is down, bring it up */
1902
if(strcmp(interface, "none") != 0){
1903
if_index = (AvahiIfIndex) if_nametoindex(interface);
1904
if(if_index == 0){
1905
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1906
exitcode = EX_UNAVAILABLE;
1907
goto end;
1908
}
1909
1910
if(quit_now){
1911
goto end;
1912
}
1913
1914
/* Re-raise priviliges */
1915
errno = 0;
1916
ret = seteuid(0);
1917
if(ret == -1){
1918
perror_plus("seteuid");
1919
}
1920
1921
#ifdef __linux__
1922
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1923
messages about the network interface to mess up the prompt */
1924
ret = klogctl(8, NULL, 5);
1925
bool restore_loglevel = true;
1926
if(ret == -1){
1927
restore_loglevel = false;
1928
perror_plus("klogctl");
1929
}
1930
#endif /* __linux__ */
1931
1932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
if(sd < 0){
1934
perror_plus("socket");
1935
exitcode = EX_OSERR;
1936
#ifdef __linux__
1937
if(restore_loglevel){
1938
ret = klogctl(7, NULL, 0);
1939
if(ret == -1){
1940
perror_plus("klogctl");
1941
}
1942
}
1943
#endif /* __linux__ */
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1950
goto end;
1951
}
1952
strcpy(network.ifr_name, interface);
1953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1954
if(ret == -1){
1955
perror_plus("ioctl SIOCGIFFLAGS");
1956
#ifdef __linux__
1957
if(restore_loglevel){
1958
ret = klogctl(7, NULL, 0);
1959
if(ret == -1){
1960
perror_plus("klogctl");
1961
}
1962
}
1963
#endif /* __linux__ */
1964
exitcode = EX_OSERR;
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1971
goto end;
1972
}
1973
if((network.ifr_flags & IFF_UP) == 0){
1974
network.ifr_flags |= IFF_UP;
1975
take_down_interface = true;
1976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1977
if(ret == -1){
1978
take_down_interface = false;
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1980
exitcode = EX_OSERR;
1981
#ifdef __linux__
1982
if(restore_loglevel){
1983
ret = klogctl(7, NULL, 0);
1984
if(ret == -1){
1985
perror_plus("klogctl");
2727
1986
}
2728
1987
}
1988
#endif /* __linux__ */
1989
/* Lower privileges */
1990
errno = 0;
1991
ret = seteuid(uid);
1992
if(ret == -1){
1993
perror_plus("seteuid");
1994
}
1995
goto end;
1996
}
1997
}
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
2000
for(int i=0; i < delay * 4; i++){
2001
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2002
if(ret == -1){
2003
perror_plus("ioctl SIOCGIFFLAGS");
2004
} else if(network.ifr_flags & IFF_RUNNING){
2729
2005
break;
2730
2006
}
2731
bool interface_was_up = interface_is_up(interface);
2732
errno = bring_up_interface(interface, delay);
2733
if(not interface_was_up){
2734
if(errno != 0){
2735
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2736
" %s\n", interface, strerror(errno));
2737
} else {
2738
errno = argz_add(&interfaces_to_take_down,
2739
&interfaces_to_take_down_size,
2740
interface);
2741
if(errno != 0){
2742
perror_plus("argz_add");
2743
}
2744
}
2745
}
2746
}
2747
if(debug and (interfaces_to_take_down == NULL)){
2748
fprintf_plus(stderr, "No interfaces were brought up\n");
2749
}
2750
}
2751
2752
/* If we only got one interface, explicitly use only that one */
2753
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2754
if(debug){
2755
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2756
mc.interfaces);
2757
}
2758
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2007
struct timespec sleeptime = { .tv_nsec = 250000000 };
2008
ret = nanosleep(&sleeptime, NULL);
2009
if(ret == -1 and errno != EINTR){
2010
perror_plus("nanosleep");
2011
}
2012
}
2013
if(not take_down_interface){
2014
/* We won't need the socket anymore */
2015
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2016
if(ret == -1){
2017
perror_plus("close");
2018
}
2019
}
2020
#ifdef __linux__
2021
if(restore_loglevel){
2022
/* Restores kernel loglevel to default */
2023
ret = klogctl(7, NULL, 0);
2024
if(ret == -1){
2025
perror_plus("klogctl");
2026
}
2027
}
2028
#endif /* __linux__ */
2029
/* Lower privileges */
2030
errno = 0;
2031
/* Lower privileges */
2032
ret = seteuid(uid);
2033
if(ret == -1){
2034
perror_plus("seteuid");
2035
}
2759
2036
}
2760
2037
2761
2038
if(quit_now){
2762
2039
goto end;
2763
2040
}
2764
2041
2765
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2042
ret = init_gnutls_global(pubkey, seckey);
2766
2043
if(ret == -1){
2767
2044
fprintf_plus(stderr, "init_gnutls_global failed\n");
2768
2045
exitcode = EX_UNAVAILABLE;
2775
2052
goto end;
2776
2053
}
2777
2054
2778
/* Try /run/tmp before /tmp */
2779
tempdir = mkdtemp(run_tempdir);
2780
if(tempdir == NULL and errno == ENOENT){
2781
if(debug){
2782
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2783
run_tempdir, old_tempdir);
2784
}
2785
tempdir = mkdtemp(old_tempdir);
2786
}
2787
if(tempdir == NULL){
2055
if(mkdtemp(tempdir) == NULL){
2788
2056
perror_plus("mkdtemp");
2789
2057
goto end;
2790
2058
}
2059
tempdir_created = true;
2791
2060
2792
2061
if(quit_now){
2793
2062
goto end;
2794
2063
}
2795
2064
2796
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2065
if(not init_gpgme(pubkey, seckey, tempdir)){
2797
2066
fprintf_plus(stderr, "init_gpgme failed\n");
2798
2067
exitcode = EX_UNAVAILABLE;
2799
2068
goto end;
2809
2078
/* Connect directly, do not use Zeroconf */
2810
2079
/* (Mainly meant for debugging) */
2811
2080
char *address = strrchr(connect_to, ':');
2812
2813
2081
if(address == NULL){
2814
2082
fprintf_plus(stderr, "No colon in address\n");
2815
2083
exitcode = EX_USAGE;
2820
2088
goto end;
2821
2089
}
2822
2090
2823
in_port_t port;
2091
uint16_t port;
2824
2092
errno = 0;
2825
2093
tmpmax = strtoimax(address+1, &tmp, 10);
2826
2094
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2827
or tmpmax != (in_port_t)tmpmax){
2095
or tmpmax != (uint16_t)tmpmax){
2828
2096
fprintf_plus(stderr, "Bad port number\n");
2829
2097
exitcode = EX_USAGE;
2830
2098
goto end;
2831
2099
}
2832
2100
2833
2101
if(quit_now){
2834
2102
goto end;
2835
2103
}
2836
2104
2837
port = (in_port_t)tmpmax;
2105
port = (uint16_t)tmpmax;
2838
2106
*address = '\0';
2839
2107
/* Colon in address indicates IPv6 */
2840
2108
int af;
2856
2124
}
2857
2125
2858
2126
while(not quit_now){
2859
ret = start_mandos_communication(address, port, if_index, af,
2860
&mc);
2127
ret = start_mandos_communication(address, port, if_index, af);
2861
2128
if(quit_now or ret == 0){
2862
2129
break;
2863
2130
}
2865
2132
fprintf_plus(stderr, "Retrying in %d seconds\n",
2866
2133
(int)retry_interval);
2867
2134
}
2868
sleep((unsigned int)retry_interval);
2135
sleep((int)retry_interval);
2869
2136
}
2870
2137
2871
if(not quit_now){
2138
if (not quit_now){
2872
2139
exitcode = EXIT_SUCCESS;
2873
2140
}
2874
2141
2889
2156
config.publish_domain = 0;
2890
2157
2891
2158
/* Allocate a new server */
2892
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2893
&config, NULL, NULL, &ret_errno);
2159
mc.server = avahi_server_new(avahi_simple_poll_get
2160
(mc.simple_poll), &config, NULL,
2161
NULL, &error);
2894
2162
2895
2163
/* Free the Avahi configuration data */
2896
2164
avahi_server_config_free(&config);
2899
2167
/* Check if creating the Avahi server object succeeded */
2900
2168
if(mc.server == NULL){
2901
2169
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2902
avahi_strerror(ret_errno));
2170
avahi_strerror(error));
2903
2171
exitcode = EX_UNAVAILABLE;
2904
2172
goto end;
2905
2173
}
2911
2179
/* Create the Avahi service browser */
2912
2180
sb = avahi_s_service_browser_new(mc.server, if_index,
2913
2181
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2914
NULL, 0, browse_callback,
2915
(void *)&mc);
2182
NULL, 0, browse_callback, NULL);
2916
2183
if(sb == NULL){
2917
2184
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2918
2185
avahi_strerror(avahi_server_errno(mc.server)));
2929
2196
if(debug){
2930
2197
fprintf_plus(stderr, "Starting Avahi loop search\n");
2931
2198
}
2932
2933
ret = avahi_loop_with_timeout(simple_poll,
2934
(int)(retry_interval * 1000), &mc);
2199
2200
ret = avahi_loop_with_timeout(mc.simple_poll,
2201
(int)(retry_interval * 1000));
2935
2202
if(debug){
2936
2203
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2937
2204
(ret == 0) ? "successfully" : "with error");
2944
2211
}
2945
2212
2946
2213
/* Cleanup things */
2947
free(mc.interfaces);
2948
2949
2214
if(sb != NULL)
2950
2215
avahi_s_service_browser_free(sb);
2951
2216
2952
2217
if(mc.server != NULL)
2953
2218
avahi_server_free(mc.server);
2954
2219
2955
if(simple_poll != NULL)
2956
avahi_simple_poll_free(simple_poll);
2220
if(mc.simple_poll != NULL)
2221
avahi_simple_poll_free(mc.simple_poll);
2957
2222
2958
2223
if(gnutls_initialized){
2959
2224
gnutls_certificate_free_credentials(mc.cred);
2225
gnutls_global_deinit();
2960
2226
gnutls_dh_params_deinit(mc.dh_params);
2961
2227
}
2962
2228
2970
2236
mc.current_server->prev->next = NULL;
2971
2237
while(mc.current_server != NULL){
2972
2238
server *next = mc.current_server->next;
2973
#ifdef __GNUC__
2974
#pragma GCC diagnostic push
2975
#pragma GCC diagnostic ignored "-Wcast-qual"
2976
#endif
2977
free((char *)(mc.current_server->ip));
2978
#ifdef __GNUC__
2979
#pragma GCC diagnostic pop
2980
#endif
2981
2239
free(mc.current_server);
2982
2240
mc.current_server = next;
2983
2241
}
2984
2242
}
2985
2243
2986
/* Re-raise privileges */
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2246
2247
/* Re-raise priviliges */
2987
2248
{
2988
ret_errno = raise_privileges();
2989
if(ret_errno != 0){
2990
errno = ret_errno;
2991
perror_plus("Failed to raise privileges");
2992
} else {
2993
2994
/* Run network hooks */
2995
run_network_hooks("stop", interfaces_hooks != NULL ?
2996
interfaces_hooks : "", delay);
2997
2998
/* Take down the network interfaces which were brought up */
2999
{
3000
char *interface = NULL;
3001
while((interface=argz_next(interfaces_to_take_down,
3002
interfaces_to_take_down_size,
3003
interface))){
3004
ret_errno = take_down_interface(interface);
3005
if(ret_errno != 0){
3006
errno = ret_errno;
3007
perror_plus("Failed to take down interface");
3008
}
3009
}
3010
if(debug and (interfaces_to_take_down == NULL)){
3011
fprintf_plus(stderr, "No interfaces needed to be taken"
3012
" down\n");
3013
}
3014
}
2249
errno = 0;
2250
ret = seteuid(0);
2251
if(ret == -1){
2252
perror_plus("seteuid");
3015
2253
}
3016
2254
3017
ret_errno = lower_privileges_permanently();
3018
if(ret_errno != 0){
3019
errno = ret_errno;
3020
perror_plus("Failed to lower privileges permanently");
2255
/* Take down the network interface */
2256
if(take_down_interface and geteuid() == 0){
2257
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2258
if(ret == -1){
2259
perror_plus("ioctl SIOCGIFFLAGS");
2260
} else if(network.ifr_flags & IFF_UP){
2261
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2262
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2263
if(ret == -1){
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2265
}
2266
}
2267
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
if(ret == -1){
2269
perror_plus("close");
2270
}
3021
2271
}
3022
2272
}
3023
3024
free(interfaces_to_take_down);
3025
free(interfaces_hooks);
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
3026
2279
3027
2280
/* Removes the GPGME temp directory and all files inside */
3028
if(tempdir != NULL){
2281
if(tempdir_created){
3029
2282
struct dirent **direntries = NULL;
3030
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3031
| O_NOFOLLOW
3032
| O_DIRECTORY
3033
| O_PATH));
3034
if(tempdir_fd == -1){
3035
perror_plus("open");
3036
} else {
3037
int numentries = scandirat(tempdir_fd, ".", &direntries,
3038
notdotentries, alphasort);
3039
if(numentries >= 0){
3040
for(int i = 0; i < numentries; i++){
3041
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3042
if(ret == -1){
3043
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3044
" \"%s\", 0): %s\n", tempdir,
3045
direntries[i]->d_name, strerror(errno));
3046
}
3047
free(direntries[i]);
3048
}
3049
3050
/* need to clean even if 0 because man page doesn't specify */
3051
free(direntries);
3052
if(numentries == -1){
3053
perror_plus("scandir");
3054
}
3055
ret = rmdir(tempdir);
3056
if(ret == -1 and errno != ENOENT){
3057
perror_plus("rmdir");
3058
}
2283
struct dirent *direntry = NULL;
2284
int numentries = scandir(tempdir, &direntries, notdotentries,
2285
alphasort);
2286
if (numentries > 0){
2287
for(int i = 0; i < numentries; i++){
2288
direntry = direntries[i];
2289
char *fullname = NULL;
2290
ret = asprintf(&fullname, "%s/%s", tempdir,
2291
direntry->d_name);
2292
if(ret < 0){
2293
perror_plus("asprintf");
2294
continue;
2295
}
2296
ret = remove(fullname);
2297
if(ret == -1){
2298
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2299
strerror(errno));
2300
}
2301
free(fullname);
3059
2302
}
3060
close(tempdir_fd);
2303
}
2304
2305
/* need to clean even if 0 because man page doesn't specify */
2306
free(direntries);
2307
if (numentries == -1){
2308
perror_plus("scandir");
2309
}
2310
ret = rmdir(tempdir);
2311
if(ret == -1 and errno != ENOENT){
2312
perror_plus("rmdir");
3061
2313
}
3062
2314
}
3063
2315
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0