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- Committer: teddy at bsnet
- Date: 2011-12-24 23:17:02 UTC
- Revision ID: teddy@fukt.bsnet.se-20111224231702-1ffgu6r02p0bz9co
* plugins.d/splashy.c (error_plus): Check format string.
* plugins.d/askpass-fifo.c (error_plus): - '' -
* plugins.d/plymouth.c (error_plus): - '' -
* plugins.d/password-prompt.c (error_plus): - '' -
* plugins.d/usplash.c (error_plus): - '' -
* plugins.d/askpass-fifo.c (error_plus): - '' -
* plugins.d/plymouth.c (error_plus): - '' -
* plugins.d/password-prompt.c (error_plus): - '' -
* plugins.d/usplash.c (error_plus): - '' -
- files removed:
- 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 © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_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;
178
170
179
171
/* Function to use when printing errors */
180
172
void perror_plus(const char *print_text){
181
int e = errno;
182
173
fprintf(stderr, "Mandos plugin %s: ",
183
174
program_invocation_short_name);
184
errno = e;
185
175
perror(print_text);
186
176
}
187
177
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
178
__attribute__((format (gnu_printf, 2, 3)))
189
179
int fprintf_plus(FILE *stream, const char *format, ...){
190
180
va_list ap;
191
181
va_start (ap, format);
192
182
193
183
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
184
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
186
}
197
187
198
188
/*
200
190
* bytes. "buffer_capacity" is how much is currently allocated,
201
191
* "buffer_length" is how much is already used.
202
192
*/
203
__attribute__((nonnull, warn_unused_result))
204
193
size_t incbuffer(char **buffer, size_t buffer_length,
205
194
size_t buffer_capacity){
206
195
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;
196
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
197
if(buffer == NULL){
213
198
return 0;
214
199
}
215
*buffer = new_buf;
216
200
buffer_capacity += BUFFER_SIZE;
217
201
}
218
202
return buffer_capacity;
219
203
}
220
204
221
205
/* 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){
206
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
207
int af){
225
208
int ret;
226
209
server *new_server = malloc(sizeof(server));
227
210
if(new_server == NULL){
234
217
.af = af };
235
218
if(new_server->ip == NULL){
236
219
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
220
return false;
253
221
}
254
222
/* Special case of first server */
255
if(*current_server == NULL){
223
if (mc.current_server == NULL){
256
224
new_server->next = new_server;
257
225
new_server->prev = new_server;
258
*current_server = new_server;
226
mc.current_server = new_server;
227
/* Place the new server last in the list */
259
228
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
229
new_server->next = mc.current_server;
230
new_server->prev = mc.current_server->prev;
263
231
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
232
mc.current_server->prev = new_server;
233
}
234
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
235
if(ret == -1){
236
perror_plus("clock_gettime");
237
return false;
265
238
}
266
239
return true;
267
240
}
269
242
/*
270
243
* Initialize GPGME.
271
244
*/
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){
245
static bool init_gpgme(const char *seckey, const char *pubkey,
246
const char *tempdir){
277
247
gpgme_error_t rc;
278
248
gpgme_engine_info_t engine_info;
279
249
250
280
251
/*
281
252
* Helper function to insert pub and seckey to the engine keyring.
282
253
*/
283
bool import_key(const char * const filename){
254
bool import_key(const char *filename){
284
255
int ret;
285
256
int fd;
286
257
gpgme_data_t pgp_data;
298
269
return false;
299
270
}
300
271
301
rc = gpgme_op_import(mc->ctx, pgp_data);
272
rc = gpgme_op_import(mc.ctx, pgp_data);
302
273
if(rc != GPG_ERR_NO_ERROR){
303
274
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
275
gpgme_strsource(rc), gpgme_strerror(rc));
305
276
return false;
306
277
}
307
278
308
ret = close(fd);
279
ret = (int)TEMP_FAILURE_RETRY(close(fd));
309
280
if(ret == -1){
310
281
perror_plus("close");
311
282
}
348
319
}
349
320
350
321
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
322
rc = gpgme_new(&(mc.ctx));
352
323
if(rc != GPG_ERR_NO_ERROR){
353
324
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
325
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
367
338
* Decrypt OpenPGP data.
368
339
* Returns -1 on error
369
340
*/
370
__attribute__((nonnull, warn_unused_result))
371
341
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
342
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
343
char **plaintext){
375
344
gpgme_data_t dh_crypto, dh_plain;
376
345
gpgme_error_t rc;
377
346
ssize_t ret;
403
372
404
373
/* Decrypt data from the cryptotext data buffer to the plaintext
405
374
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
375
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
376
if(rc != GPG_ERR_NO_ERROR){
408
377
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
378
gpgme_strsource(rc), gpgme_strerror(rc));
410
379
plaintext_length = -1;
411
380
if(debug){
412
381
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
382
result = gpgme_op_decrypt_result(mc.ctx);
414
383
if(result == NULL){
415
384
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
416
385
} else {
493
462
return plaintext_length;
494
463
}
495
464
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);
465
static const char * safer_gnutls_strerror(int value){
466
const char *ret = gnutls_strerror(value); /* Spurious warning from
467
-Wunreachable-code */
468
if(ret == NULL)
469
ret = "(unknown)";
470
return ret;
507
471
}
508
472
509
473
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
474
static void debuggnutls(__attribute__((unused)) int level,
512
475
const char* string){
513
476
fprintf_plus(stderr, "GnuTLS: %s", string);
514
477
}
515
478
516
__attribute__((nonnull, warn_unused_result))
517
479
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
480
const char *seckeyfilename){
521
481
int ret;
522
unsigned int uret;
523
482
524
483
if(debug){
525
484
fprintf_plus(stderr, "Initializing GnuTLS\n");
541
500
}
542
501
543
502
/* OpenPGP credentials */
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
503
ret = gnutls_certificate_allocate_credentials(&mc.cred);
545
504
if(ret != GNUTLS_E_SUCCESS){
546
505
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
506
safer_gnutls_strerror(ret));
557
516
}
558
517
559
518
ret = gnutls_certificate_set_openpgp_key_file
560
(mc->cred, pubkeyfilename, seckeyfilename,
519
(mc.cred, pubkeyfilename, seckeyfilename,
561
520
GNUTLS_OPENPGP_FMT_BASE64);
562
521
if(ret != GNUTLS_E_SUCCESS){
563
522
fprintf_plus(stderr,
569
528
}
570
529
571
530
/* GnuTLS server initialization */
572
ret = gnutls_dh_params_init(&mc->dh_params);
531
ret = gnutls_dh_params_init(&mc.dh_params);
573
532
if(ret != GNUTLS_E_SUCCESS){
574
533
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
534
" initialization: %s\n",
576
535
safer_gnutls_strerror(ret));
577
536
goto globalfail;
578
537
}
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);
538
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
539
if(ret != GNUTLS_E_SUCCESS){
540
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
541
safer_gnutls_strerror(ret));
542
goto globalfail;
543
}
544
545
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
752
546
753
547
return 0;
754
548
755
549
globalfail:
756
550
757
gnutls_certificate_free_credentials(mc->cred);
551
gnutls_certificate_free_credentials(mc.cred);
758
552
gnutls_global_deinit();
759
gnutls_dh_params_deinit(mc->dh_params);
553
gnutls_dh_params_deinit(mc.dh_params);
760
554
return -1;
761
555
}
762
556
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
765
mandos_context *mc){
557
static int init_gnutls_session(gnutls_session_t *session){
766
558
int ret;
767
559
/* GnuTLS session creation */
768
560
do {
780
572
{
781
573
const char *err;
782
574
do {
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
575
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
784
576
if(quit_now){
785
577
gnutls_deinit(*session);
786
578
return -1;
797
589
798
590
do {
799
591
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
800
mc->cred);
592
mc.cred);
801
593
if(quit_now){
802
594
gnutls_deinit(*session);
803
595
return -1;
813
605
/* ignore client certificate if any. */
814
606
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
815
607
608
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
609
816
610
return 0;
817
611
}
818
612
820
614
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
821
615
__attribute__((unused)) const char *txt){}
822
616
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
1041
617
/* Called when a Mandos server is found */
1042
__attribute__((nonnull, warn_unused_result))
1043
static int start_mandos_communication(const char *ip, in_port_t port,
618
static int start_mandos_communication(const char *ip, uint16_t port,
1044
619
AvahiIfIndex if_index,
1045
int af, mandos_context *mc){
620
int af){
1046
621
int ret, tcp_sd = -1;
1047
622
ssize_t sret;
1048
struct sockaddr_storage to;
623
union {
624
struct sockaddr_in in;
625
struct sockaddr_in6 in6;
626
} to;
1049
627
char *buffer = NULL;
1050
628
char *decrypted_buffer = NULL;
1051
629
size_t buffer_length = 0;
1054
632
int retval = -1;
1055
633
gnutls_session_t session;
1056
634
int pf; /* Protocol family */
1057
bool route_added = false;
1058
635
1059
636
errno = 0;
1060
637
1076
653
return -1;
1077
654
}
1078
655
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);
656
ret = init_gnutls_session(&session);
1112
657
if(ret != 0){
1113
658
return -1;
1114
659
}
1115
660
1116
661
if(debug){
1117
662
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1118
PRIuMAX "\n", ip, (uintmax_t)port);
663
PRIu16 "\n", ip, port);
1119
664
}
1120
665
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
666
tcp_sd = socket(pf, SOCK_STREAM, 0);
1122
667
if(tcp_sd < 0){
1123
668
int e = errno;
1124
669
perror_plus("socket");
1131
676
goto mandos_end;
1132
677
}
1133
678
679
memset(&to, 0, sizeof(to));
1134
680
if(af == AF_INET6){
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);
681
to.in6.sin6_family = (sa_family_t)af;
682
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1138
683
} else { /* IPv4 */
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);
684
to.in.sin_family = (sa_family_t)af;
685
ret = inet_pton(af, ip, &to.in.sin_addr);
1142
686
}
1143
687
if(ret < 0 ){
1144
688
int e = errno;
1153
697
goto mandos_end;
1154
698
}
1155
699
if(af == AF_INET6){
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
700
to.in6.sin6_port = htons(port); /* Spurious warnings from
701
-Wconversion and
702
-Wunreachable-code */
703
704
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
705
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
706
-Wunreachable-code*/
1159
707
if(if_index == AVAHI_IF_UNSPEC){
1160
708
fprintf_plus(stderr, "An IPv6 link-local address is"
1161
709
" incomplete without a network interface\n");
1163
711
goto mandos_end;
1164
712
}
1165
713
/* Set the network interface number as scope */
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
714
to.in6.sin6_scope_id = (uint32_t)if_index;
1167
715
}
1168
716
} else {
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
717
to.in.sin_port = htons(port); /* Spurious warnings from
718
-Wconversion and
719
-Wunreachable-code */
1170
720
}
1171
721
1172
722
if(quit_now){
1180
730
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1181
731
perror_plus("if_indextoname");
1182
732
} else {
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
733
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
734
"\n", ip, interface, port);
1185
735
}
1186
736
} else {
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
737
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
738
ip, port);
1189
739
}
1190
740
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1191
741
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
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;
742
const char *pcret;
743
if(af == AF_INET6){
744
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
745
sizeof(addrstr));
746
} else {
747
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
748
sizeof(addrstr));
749
}
750
if(pcret == NULL){
751
perror_plus("inet_ntop");
752
} else {
753
if(strcmp(addrstr, ip) != 0){
754
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
755
}
756
}
757
}
758
759
if(quit_now){
760
errno = EINTR;
761
goto mandos_end;
762
}
763
764
if(af == AF_INET6){
765
ret = connect(tcp_sd, &to.in6, sizeof(to));
766
} else {
767
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
768
}
769
if(ret < 0){
770
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
771
int e = errno;
772
perror_plus("connect");
773
errno = e;
774
}
775
goto mandos_end;
776
}
777
778
if(quit_now){
779
errno = EINTR;
780
goto mandos_end;
1272
781
}
1273
782
1274
783
const char *out = mandos_protocol_version;
1310
819
goto mandos_end;
1311
820
}
1312
821
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);
822
/* Spurious warning from -Wint-to-pointer-cast */
823
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1318
824
1319
825
if(quit_now){
1320
826
errno = EINTR;
1425
931
if(buffer_length > 0){
1426
932
ssize_t decrypted_buffer_size;
1427
933
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1428
&decrypted_buffer, mc);
934
&decrypted_buffer);
1429
935
if(decrypted_buffer_size >= 0){
1430
936
1431
937
written = 0;
1457
963
1458
964
mandos_end:
1459
965
{
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
}
1466
966
int e = errno;
1467
967
free(decrypted_buffer);
1468
968
free(buffer);
1469
969
if(tcp_sd >= 0){
1470
ret = close(tcp_sd);
970
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1471
971
}
1472
972
if(ret == -1){
1473
973
if(e == 0){
1485
985
return retval;
1486
986
}
1487
987
1488
__attribute__((nonnull))
1489
988
static void resolve_callback(AvahiSServiceResolver *r,
1490
989
AvahiIfIndex interface,
1491
990
AvahiProtocol proto,
1499
998
AVAHI_GCC_UNUSED AvahiStringList *txt,
1500
999
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1501
1000
flags,
1502
void *mc){
1503
if(r == NULL){
1504
return;
1505
}
1001
AVAHI_GCC_UNUSED void* userdata){
1002
assert(r);
1506
1003
1507
1004
/* Called whenever a service has been resolved successfully or
1508
1005
timed out */
1509
1006
1510
1007
if(quit_now){
1511
avahi_s_service_resolver_free(r);
1512
1008
return;
1513
1009
}
1514
1010
1518
1014
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1519
1015
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1520
1016
domain,
1521
avahi_strerror(avahi_server_errno
1522
(((mandos_context*)mc)->server)));
1017
avahi_strerror(avahi_server_errno(mc.server)));
1523
1018
break;
1524
1019
1525
1020
case AVAHI_RESOLVER_FOUND:
1531
1026
PRIdMAX ") on port %" PRIu16 "\n", name,
1532
1027
host_name, ip, (intmax_t)interface, port);
1533
1028
}
1534
int ret = start_mandos_communication(ip, (in_port_t)port,
1535
interface,
1536
avahi_proto_to_af(proto),
1537
mc);
1029
int ret = start_mandos_communication(ip, port, interface,
1030
avahi_proto_to_af(proto));
1538
1031
if(ret == 0){
1539
avahi_simple_poll_quit(simple_poll);
1032
avahi_simple_poll_quit(mc.simple_poll);
1540
1033
} else {
1541
if(not add_server(ip, (in_port_t)port, interface,
1542
avahi_proto_to_af(proto),
1543
&((mandos_context*)mc)->current_server)){
1034
if(not add_server(ip, port, interface,
1035
avahi_proto_to_af(proto))){
1544
1036
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1545
1037
" list\n", name);
1546
1038
}
1559
1051
const char *domain,
1560
1052
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1561
1053
flags,
1562
void *mc){
1563
if(b == NULL){
1564
return;
1565
}
1054
AVAHI_GCC_UNUSED void* userdata){
1055
assert(b);
1566
1056
1567
1057
/* Called whenever a new services becomes available on the LAN or
1568
1058
is removed from the LAN */
1576
1066
case AVAHI_BROWSER_FAILURE:
1577
1067
1578
1068
fprintf_plus(stderr, "(Avahi browser) %s\n",
1579
avahi_strerror(avahi_server_errno
1580
(((mandos_context*)mc)->server)));
1581
avahi_simple_poll_quit(simple_poll);
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
avahi_simple_poll_quit(mc.simple_poll);
1582
1071
return;
1583
1072
1584
1073
case AVAHI_BROWSER_NEW:
1587
1076
the callback function is called the Avahi server will free the
1588
1077
resolver for us. */
1589
1078
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)
1079
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1080
name, type, domain, protocol, 0,
1081
resolve_callback, NULL) == NULL)
1594
1082
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1595
1083
" %s\n", name,
1596
avahi_strerror(avahi_server_errno
1597
(((mandos_context*)mc)->server)));
1084
avahi_strerror(avahi_server_errno(mc.server)));
1598
1085
break;
1599
1086
1600
1087
case AVAHI_BROWSER_REMOVE:
1619
1106
signal_received = sig;
1620
1107
int old_errno = errno;
1621
1108
/* set main loop to exit */
1622
if(simple_poll != NULL){
1623
avahi_simple_poll_quit(simple_poll);
1109
if(mc.simple_poll != NULL){
1110
avahi_simple_poll_quit(mc.simple_poll);
1624
1111
}
1625
1112
errno = old_errno;
1626
1113
}
1627
1114
1628
__attribute__((nonnull, warn_unused_result))
1629
1115
bool get_flags(const char *ifname, struct ifreq *ifr){
1630
1116
int ret;
1631
error_t ret_errno;
1632
1117
1633
1118
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1634
1119
if(s < 0){
1635
ret_errno = errno;
1636
1120
perror_plus("socket");
1637
errno = ret_errno;
1638
1121
return false;
1639
1122
}
1640
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1641
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1123
strcpy(ifr->ifr_name, ifname);
1642
1124
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1643
1125
if(ret == -1){
1644
1126
if(debug){
1645
ret_errno = errno;
1646
1127
perror_plus("ioctl SIOCGIFFLAGS");
1647
errno = ret_errno;
1648
1128
}
1649
1129
return false;
1650
1130
}
1651
1131
return true;
1652
1132
}
1653
1133
1654
__attribute__((nonnull, warn_unused_result))
1655
1134
bool good_flags(const char *ifname, const struct ifreq *ifr){
1656
1135
1657
1136
/* Reject the loopback device */
1699
1178
* corresponds to an acceptable network device.
1700
1179
* (This function is passed to scandir(3) as a filter function.)
1701
1180
*/
1702
__attribute__((nonnull, warn_unused_result))
1703
1181
int good_interface(const struct dirent *if_entry){
1704
1182
if(if_entry->d_name[0] == '.'){
1705
1183
return 0;
1721
1199
}
1722
1200
1723
1201
/*
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))
1202
* This function determines if a directory entry in /sys/class/net
1203
* corresponds to an acceptable network device which is up.
1204
* (This function is passed to scandir(3) as a filter function.)
1205
*/
1206
int up_interface(const struct dirent *if_entry){
1207
if(if_entry->d_name[0] == '.'){
1208
return 0;
1209
}
1210
1211
struct ifreq ifr;
1212
if(not get_flags(if_entry->d_name, &ifr)){
1213
if(debug){
1214
fprintf_plus(stderr, "Failed to get flags for interface "
1215
"\"%s\"\n", if_entry->d_name);
1216
}
1217
return 0;
1218
}
1219
1220
/* Reject down interfaces */
1221
if(not (ifr.ifr_flags & IFF_UP)){
1222
if(debug){
1223
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1224
if_entry->d_name);
1225
}
1226
return 0;
1227
}
1228
1229
/* Reject non-running interfaces */
1230
if(not (ifr.ifr_flags & IFF_RUNNING)){
1231
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1233
if_entry->d_name);
1234
}
1235
return 0;
1236
}
1237
1238
if(not good_flags(if_entry->d_name, &ifr)){
1239
return 0;
1240
}
1241
return 1;
1242
}
1243
1758
1244
int notdotentries(const struct dirent *direntry){
1759
1245
/* Skip "." and ".." */
1760
1246
if(direntry->d_name[0] == '.'
1767
1253
}
1768
1254
1769
1255
/* Is this directory entry a runnable program? */
1770
__attribute__((nonnull, warn_unused_result))
1771
1256
int runnable_hook(const struct dirent *direntry){
1772
1257
int ret;
1773
1258
size_t sret;
1781
1266
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1782
1267
"abcdefghijklmnopqrstuvwxyz"
1783
1268
"0123456789"
1784
"_.-");
1269
"_-");
1785
1270
if((direntry->d_name)[sret] != '\0'){
1786
1271
/* Contains non-allowed characters */
1787
1272
if(debug){
1791
1276
return 0;
1792
1277
}
1793
1278
1794
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1279
char *fullname = NULL;
1280
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1281
if(ret < 0){
1282
perror_plus("asprintf");
1283
return 0;
1284
}
1285
1286
ret = stat(fullname, &st);
1795
1287
if(ret == -1){
1796
1288
if(debug){
1797
1289
perror_plus("Could not stat hook");
1821
1313
return 1;
1822
1314
}
1823
1315
1824
__attribute__((nonnull, warn_unused_result))
1825
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1826
mandos_context *mc){
1316
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1827
1317
int ret;
1828
1318
struct timespec now;
1829
1319
struct timespec waited_time;
1830
1320
intmax_t block_time;
1831
1321
1832
1322
while(true){
1833
if(mc->current_server == NULL){
1834
if(debug){
1323
if(mc.current_server == NULL){
1324
if (debug){
1835
1325
fprintf_plus(stderr, "Wait until first server is found."
1836
1326
" No timeout!\n");
1837
1327
}
1838
1328
ret = avahi_simple_poll_iterate(s, -1);
1839
1329
} else {
1840
if(debug){
1330
if (debug){
1841
1331
fprintf_plus(stderr, "Check current_server if we should run"
1842
1332
" it, or wait\n");
1843
1333
}
1850
1340
/* Calculating in ms how long time between now and server
1851
1341
who we visted longest time ago. Now - last seen. */
1852
1342
waited_time.tv_sec = (now.tv_sec
1853
- mc->current_server->last_seen.tv_sec);
1343
- mc.current_server->last_seen.tv_sec);
1854
1344
waited_time.tv_nsec = (now.tv_nsec
1855
- mc->current_server->last_seen.tv_nsec);
1345
- mc.current_server->last_seen.tv_nsec);
1856
1346
/* total time is 10s/10,000ms.
1857
1347
Converting to s from ms by dividing by 1,000,
1858
1348
and ns to ms by dividing by 1,000,000. */
1860
1350
- ((intmax_t)waited_time.tv_sec * 1000))
1861
1351
- ((intmax_t)waited_time.tv_nsec / 1000000));
1862
1352
1863
if(debug){
1353
if (debug){
1864
1354
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1865
1355
block_time);
1866
1356
}
1867
1357
1868
1358
if(block_time <= 0){
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);
1359
ret = start_mandos_communication(mc.current_server->ip,
1360
mc.current_server->port,
1361
mc.current_server->if_index,
1362
mc.current_server->af);
1873
1363
if(ret == 0){
1874
avahi_simple_poll_quit(s);
1364
avahi_simple_poll_quit(mc.simple_poll);
1875
1365
return 0;
1876
1366
}
1877
1367
ret = clock_gettime(CLOCK_MONOTONIC,
1878
&mc->current_server->last_seen);
1368
&mc.current_server->last_seen);
1879
1369
if(ret == -1){
1880
1370
perror_plus("clock_gettime");
1881
1371
return -1;
1882
1372
}
1883
mc->current_server = mc->current_server->next;
1373
mc.current_server = mc.current_server->next;
1884
1374
block_time = 0; /* Call avahi to find new Mandos
1885
1375
servers, but don't block */
1886
1376
}
1888
1378
ret = avahi_simple_poll_iterate(s, (int)block_time);
1889
1379
}
1890
1380
if(ret != 0){
1891
if(ret > 0 or errno != EINTR){
1381
if (ret > 0 or errno != EINTR){
1892
1382
return (ret != 1) ? ret : 0;
1893
1383
}
1894
1384
}
1895
1385
}
1896
1386
}
1897
1387
1898
__attribute__((nonnull))
1899
void run_network_hooks(const char *mode, const char *interface,
1388
bool run_network_hooks(const char *mode, const char *interface,
1900
1389
const float delay){
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__ */
1390
struct dirent **direntries;
1391
struct dirent *direntry;
1392
int ret;
1393
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1394
alphasort);
1929
1395
if(numhooks == -1){
1930
1396
perror_plus("scandir");
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){
1397
} else {
1398
int devnull = open("/dev/null", O_RDONLY);
1399
for(int i = 0; i < numhooks; i++){
1400
direntry = direntries[i];
1401
char *fullname = NULL;
1402
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1403
if(ret < 0){
1992
1404
perror_plus("asprintf");
1993
_exit(EX_OSERR);
1994
}
1995
ret = setenv("DELAY", delaystring, 1);
1996
if(ret == -1){
1405
continue;
1406
}
1407
if(debug){
1408
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1409
direntry->d_name);
1410
}
1411
pid_t hook_pid = fork();
1412
if(hook_pid == 0){
1413
/* Child */
1414
/* Raise privileges */
1415
errno = 0;
1416
ret = seteuid(0);
1417
if(ret == -1){
1418
perror_plus("seteuid");
1419
}
1420
/* Raise privileges even more */
1421
errno = 0;
1422
ret = setuid(0);
1423
if(ret == -1){
1424
perror_plus("setuid");
1425
}
1426
/* Set group */
1427
errno = 0;
1428
ret = setgid(0);
1429
if(ret == -1){
1430
perror_plus("setgid");
1431
}
1432
/* Reset supplementary groups */
1433
errno = 0;
1434
ret = setgroups(0, NULL);
1435
if(ret == -1){
1436
perror_plus("setgroups");
1437
}
1438
dup2(devnull, STDIN_FILENO);
1439
close(devnull);
1440
dup2(STDERR_FILENO, STDOUT_FILENO);
1441
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1442
if(ret == -1){
1443
perror_plus("setenv");
1444
_exit(EX_OSERR);
1445
}
1446
ret = setenv("DEVICE", interface, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("MODE", mode, 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
char *delaystring;
1462
ret = asprintf(&delaystring, "%f", delay);
1463
if(ret == -1){
1464
perror_plus("asprintf");
1465
_exit(EX_OSERR);
1466
}
1467
ret = setenv("DELAY", delaystring, 1);
1468
if(ret == -1){
1469
free(delaystring);
1470
perror_plus("setenv");
1471
_exit(EX_OSERR);
1472
}
1997
1473
free(delaystring);
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;
1474
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1475
perror_plus("execl");
1476
_exit(EXIT_FAILURE);
1477
}
1478
} else {
1479
int status;
1480
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1481
perror_plus("waitpid");
1482
free(fullname);
1483
continue;
1484
}
1485
if(WIFEXITED(status)){
1486
if(WEXITSTATUS(status) != 0){
1487
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1488
" with status %d\n", direntry->d_name,
1489
WEXITSTATUS(status));
1490
free(fullname);
1491
continue;
1492
}
1493
} else if(WIFSIGNALED(status)){
1494
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1495
" signal %d\n", direntry->d_name,
1496
WTERMSIG(status));
1497
free(fullname);
1498
continue;
1499
} else {
1500
fprintf_plus(stderr, "Warning: network hook \"%s\""
1501
" crashed\n", direntry->d_name);
1502
free(fullname);
1503
continue;
1504
}
1505
}
1506
free(fullname);
1507
if(debug){
1508
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1509
direntry->d_name);
1510
}
1511
}
1512
close(devnull);
1513
}
1514
return true;
2288
1515
}
2289
1516
2290
1517
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 };
2296
1518
AvahiSServiceBrowser *sb = NULL;
2297
error_t ret_errno;
1519
int error;
2298
1520
int ret;
2299
1521
intmax_t tmpmax;
2300
1522
char *tmp;
2301
1523
int exitcode = EXIT_SUCCESS;
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;
1524
const char *interface = "";
1525
struct ifreq network;
1526
int sd = -1;
1527
bool take_down_interface = false;
1528
uid_t uid;
1529
gid_t gid;
1530
char tempdir[] = "/tmp/mandosXXXXXX";
1531
bool tempdir_created = false;
2307
1532
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2308
1533
const char *seckey = PATHDIR "/" SECKEY;
2309
1534
const char *pubkey = PATHDIR "/" PUBKEY;
2310
const char *dh_params_file = NULL;
2311
char *interfaces_hooks = NULL;
2312
1535
2313
1536
bool gnutls_initialized = false;
2314
1537
bool gpgme_initialized = false;
2366
1589
.doc = "Bit length of the prime number used in the"
2367
1590
" Diffie-Hellman key exchange",
2368
1591
.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 },
2374
1592
{ .name = "priority", .key = 130,
2375
1593
.arg = "STRING",
2376
1594
.doc = "GnuTLS priority string for the TLS handshake",
2381
1599
.group = 2 },
2382
1600
{ .name = "retry", .key = 132,
2383
1601
.arg = "SECONDS",
2384
.doc = "Retry interval used when denied by the Mandos server",
1602
.doc = "Retry interval used when denied by the mandos server",
2385
1603
.group = 2 },
2386
1604
{ .name = "network-hook-dir", .key = 133,
2387
1605
.arg = "DIR",
2410
1628
connect_to = arg;
2411
1629
break;
2412
1630
case 'i': /* --interface */
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
}
1631
interface = arg;
2418
1632
break;
2419
1633
case 's': /* --seckey */
2420
1634
seckey = arg;
2431
1645
}
2432
1646
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2433
1647
break;
2434
case 134: /* --dh-params */
2435
dh_params_file = arg;
2436
break;
2437
1648
case 130: /* --priority */
2438
1649
mc.priority = arg;
2439
1650
break;
2495
1706
goto end;
2496
1707
}
2497
1708
}
2498
1709
2499
1710
{
2500
1711
/* Work around Debian bug #633582:
2501
1712
<http://bugs.debian.org/633582> */
2502
1713
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");
1714
/* Re-raise priviliges */
1715
errno = 0;
1716
ret = seteuid(0);
1717
if(ret == -1){
1718
perror_plus("seteuid");
2508
1719
} else {
2509
1720
struct stat st;
2510
1721
2525
1736
}
2526
1737
}
2527
1738
}
2528
close(seckey_fd);
1739
TEMP_FAILURE_RETRY(close(seckey_fd));
2529
1740
}
2530
1741
}
2531
1742
2532
1743
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2533
1744
int pubkey_fd = open(pubkey, O_RDONLY);
2534
1745
if(pubkey_fd == -1){
2546
1757
}
2547
1758
}
2548
1759
}
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
1760
TEMP_FAILURE_RETRY(close(pubkey_fd));
1761
}
1762
}
1763
2575
1764
/* Lower privileges */
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;
1765
errno = 0;
1766
ret = seteuid(uid);
1767
if(ret == -1){
1768
perror_plus("seteuid");
2597
1769
}
2598
1770
}
2599
1771
}
2600
1772
2601
1773
/* Run network hooks */
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);
1774
if(not run_network_hooks("start", interface, delay)){
1775
goto end;
2614
1776
}
2615
1777
2616
1778
if(not debug){
2617
1779
avahi_set_log_function(empty_log);
2618
1780
}
2619
1781
1782
if(interface[0] == '\0'){
1783
struct dirent **direntries;
1784
/* First look for interfaces that are up */
1785
ret = scandir(sys_class_net, &direntries, up_interface,
1786
alphasort);
1787
if(ret == 0){
1788
/* No up interfaces, look for any good interfaces */
1789
free(direntries);
1790
ret = scandir(sys_class_net, &direntries, good_interface,
1791
alphasort);
1792
}
1793
if(ret >= 1){
1794
/* Pick the first interface returned */
1795
interface = strdup(direntries[0]->d_name);
1796
if(debug){
1797
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1798
}
1799
if(interface == NULL){
1800
perror_plus("malloc");
1801
free(direntries);
1802
exitcode = EXIT_FAILURE;
1803
goto end;
1804
}
1805
free(direntries);
1806
} else {
1807
free(direntries);
1808
fprintf_plus(stderr, "Could not find a network interface\n");
1809
exitcode = EXIT_FAILURE;
1810
goto end;
1811
}
1812
}
1813
2620
1814
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2621
1815
from the signal handler */
2622
1816
/* Initialize the pseudo-RNG for Avahi */
2623
1817
srand((unsigned int) time(NULL));
2624
simple_poll = avahi_simple_poll_new();
2625
if(simple_poll == NULL){
1818
mc.simple_poll = avahi_simple_poll_new();
1819
if(mc.simple_poll == NULL){
2626
1820
fprintf_plus(stderr,
2627
1821
"Avahi: Failed to create simple poll object.\n");
2628
1822
exitcode = EX_UNAVAILABLE;
2692
1886
}
2693
1887
}
2694
1888
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;
1889
/* If the interface is down, bring it up */
1890
if(strcmp(interface, "none") != 0){
1891
if_index = (AvahiIfIndex) if_nametoindex(interface);
1892
if(if_index == 0){
1893
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1894
exitcode = EX_UNAVAILABLE;
1895
goto end;
1896
}
1897
1898
if(quit_now){
1899
goto end;
1900
}
1901
1902
/* Re-raise priviliges */
1903
errno = 0;
1904
ret = seteuid(0);
1905
if(ret == -1){
1906
perror_plus("seteuid");
1907
}
1908
1909
#ifdef __linux__
1910
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1911
messages about the network interface to mess up the prompt */
1912
ret = klogctl(8, NULL, 5);
1913
bool restore_loglevel = true;
1914
if(ret == -1){
1915
restore_loglevel = false;
1916
perror_plus("klogctl");
1917
}
1918
#endif /* __linux__ */
1919
1920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1921
if(sd < 0){
1922
perror_plus("socket");
1923
exitcode = EX_OSERR;
1924
#ifdef __linux__
1925
if(restore_loglevel){
1926
ret = klogctl(7, NULL, 0);
1927
if(ret == -1){
1928
perror_plus("klogctl");
1929
}
1930
}
1931
#endif /* __linux__ */
1932
/* Lower privileges */
1933
errno = 0;
1934
ret = seteuid(uid);
1935
if(ret == -1){
1936
perror_plus("seteuid");
1937
}
1938
goto end;
1939
}
1940
strcpy(network.ifr_name, interface);
1941
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1942
if(ret == -1){
1943
perror_plus("ioctl SIOCGIFFLAGS");
1944
#ifdef __linux__
1945
if(restore_loglevel){
1946
ret = klogctl(7, NULL, 0);
1947
if(ret == -1){
1948
perror_plus("klogctl");
1949
}
1950
}
1951
#endif /* __linux__ */
1952
exitcode = EX_OSERR;
1953
/* Lower privileges */
1954
errno = 0;
1955
ret = seteuid(uid);
1956
if(ret == -1){
1957
perror_plus("seteuid");
1958
}
1959
goto end;
1960
}
1961
if((network.ifr_flags & IFF_UP) == 0){
1962
network.ifr_flags |= IFF_UP;
1963
take_down_interface = true;
1964
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1965
if(ret == -1){
1966
take_down_interface = false;
1967
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1968
exitcode = EX_OSERR;
1969
#ifdef __linux__
1970
if(restore_loglevel){
1971
ret = klogctl(7, NULL, 0);
1972
if(ret == -1){
1973
perror_plus("klogctl");
2746
1974
}
2747
1975
}
1976
#endif /* __linux__ */
1977
/* Lower privileges */
1978
errno = 0;
1979
ret = seteuid(uid);
1980
if(ret == -1){
1981
perror_plus("seteuid");
1982
}
1983
goto end;
1984
}
1985
}
1986
/* Sleep checking until interface is running.
1987
Check every 0.25s, up to total time of delay */
1988
for(int i=0; i < delay * 4; i++){
1989
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1990
if(ret == -1){
1991
perror_plus("ioctl SIOCGIFFLAGS");
1992
} else if(network.ifr_flags & IFF_RUNNING){
2748
1993
break;
2749
1994
}
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);
1995
struct timespec sleeptime = { .tv_nsec = 250000000 };
1996
ret = nanosleep(&sleeptime, NULL);
1997
if(ret == -1 and errno != EINTR){
1998
perror_plus("nanosleep");
1999
}
2000
}
2001
if(not take_down_interface){
2002
/* We won't need the socket anymore */
2003
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2004
if(ret == -1){
2005
perror_plus("close");
2006
}
2007
}
2008
#ifdef __linux__
2009
if(restore_loglevel){
2010
/* Restores kernel loglevel to default */
2011
ret = klogctl(7, NULL, 0);
2012
if(ret == -1){
2013
perror_plus("klogctl");
2014
}
2015
}
2016
#endif /* __linux__ */
2017
/* Lower privileges */
2018
errno = 0;
2019
/* Lower privileges */
2020
ret = seteuid(uid);
2021
if(ret == -1){
2022
perror_plus("seteuid");
2023
}
2778
2024
}
2779
2025
2780
2026
if(quit_now){
2781
2027
goto end;
2782
2028
}
2783
2029
2784
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2030
ret = init_gnutls_global(pubkey, seckey);
2785
2031
if(ret == -1){
2786
2032
fprintf_plus(stderr, "init_gnutls_global failed\n");
2787
2033
exitcode = EX_UNAVAILABLE;
2794
2040
goto end;
2795
2041
}
2796
2042
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){
2043
if(mkdtemp(tempdir) == NULL){
2807
2044
perror_plus("mkdtemp");
2808
2045
goto end;
2809
2046
}
2047
tempdir_created = true;
2810
2048
2811
2049
if(quit_now){
2812
2050
goto end;
2813
2051
}
2814
2052
2815
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
2816
2054
fprintf_plus(stderr, "init_gpgme failed\n");
2817
2055
exitcode = EX_UNAVAILABLE;
2818
2056
goto end;
2828
2066
/* Connect directly, do not use Zeroconf */
2829
2067
/* (Mainly meant for debugging) */
2830
2068
char *address = strrchr(connect_to, ':');
2831
2832
2069
if(address == NULL){
2833
2070
fprintf_plus(stderr, "No colon in address\n");
2834
2071
exitcode = EX_USAGE;
2839
2076
goto end;
2840
2077
}
2841
2078
2842
in_port_t port;
2079
uint16_t port;
2843
2080
errno = 0;
2844
2081
tmpmax = strtoimax(address+1, &tmp, 10);
2845
2082
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2846
or tmpmax != (in_port_t)tmpmax){
2083
or tmpmax != (uint16_t)tmpmax){
2847
2084
fprintf_plus(stderr, "Bad port number\n");
2848
2085
exitcode = EX_USAGE;
2849
2086
goto end;
2850
2087
}
2851
2088
2852
2089
if(quit_now){
2853
2090
goto end;
2854
2091
}
2855
2092
2856
port = (in_port_t)tmpmax;
2093
port = (uint16_t)tmpmax;
2857
2094
*address = '\0';
2858
2095
/* Colon in address indicates IPv6 */
2859
2096
int af;
2875
2112
}
2876
2113
2877
2114
while(not quit_now){
2878
ret = start_mandos_communication(address, port, if_index, af,
2879
&mc);
2115
ret = start_mandos_communication(address, port, if_index, af);
2880
2116
if(quit_now or ret == 0){
2881
2117
break;
2882
2118
}
2884
2120
fprintf_plus(stderr, "Retrying in %d seconds\n",
2885
2121
(int)retry_interval);
2886
2122
}
2887
sleep((unsigned int)retry_interval);
2123
sleep((int)retry_interval);
2888
2124
}
2889
2125
2890
if(not quit_now){
2126
if (not quit_now){
2891
2127
exitcode = EXIT_SUCCESS;
2892
2128
}
2893
2129
2908
2144
config.publish_domain = 0;
2909
2145
2910
2146
/* Allocate a new server */
2911
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2912
&config, NULL, NULL, &ret_errno);
2147
mc.server = avahi_server_new(avahi_simple_poll_get
2148
(mc.simple_poll), &config, NULL,
2149
NULL, &error);
2913
2150
2914
2151
/* Free the Avahi configuration data */
2915
2152
avahi_server_config_free(&config);
2918
2155
/* Check if creating the Avahi server object succeeded */
2919
2156
if(mc.server == NULL){
2920
2157
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2921
avahi_strerror(ret_errno));
2158
avahi_strerror(error));
2922
2159
exitcode = EX_UNAVAILABLE;
2923
2160
goto end;
2924
2161
}
2930
2167
/* Create the Avahi service browser */
2931
2168
sb = avahi_s_service_browser_new(mc.server, if_index,
2932
2169
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2933
NULL, 0, browse_callback,
2934
(void *)&mc);
2170
NULL, 0, browse_callback, NULL);
2935
2171
if(sb == NULL){
2936
2172
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2937
2173
avahi_strerror(avahi_server_errno(mc.server)));
2948
2184
if(debug){
2949
2185
fprintf_plus(stderr, "Starting Avahi loop search\n");
2950
2186
}
2951
2952
ret = avahi_loop_with_timeout(simple_poll,
2953
(int)(retry_interval * 1000), &mc);
2187
2188
ret = avahi_loop_with_timeout(mc.simple_poll,
2189
(int)(retry_interval * 1000));
2954
2190
if(debug){
2955
2191
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2956
2192
(ret == 0) ? "successfully" : "with error");
2963
2199
}
2964
2200
2965
2201
/* Cleanup things */
2966
free(mc.interfaces);
2967
2968
2202
if(sb != NULL)
2969
2203
avahi_s_service_browser_free(sb);
2970
2204
2971
2205
if(mc.server != NULL)
2972
2206
avahi_server_free(mc.server);
2973
2207
2974
if(simple_poll != NULL)
2975
avahi_simple_poll_free(simple_poll);
2208
if(mc.simple_poll != NULL)
2209
avahi_simple_poll_free(mc.simple_poll);
2976
2210
2977
2211
if(gnutls_initialized){
2978
2212
gnutls_certificate_free_credentials(mc.cred);
2990
2224
mc.current_server->prev->next = NULL;
2991
2225
while(mc.current_server != NULL){
2992
2226
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
3001
2227
free(mc.current_server);
3002
2228
mc.current_server = next;
3003
2229
}
3004
2230
}
3005
2231
3006
/* Re-raise privileges */
2232
/* Run network hooks */
2233
run_network_hooks("stop", interface, delay);
2234
2235
/* Re-raise priviliges */
3007
2236
{
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
}
2237
errno = 0;
2238
ret = seteuid(0);
2239
if(ret == -1){
2240
perror_plus("seteuid");
3035
2241
}
3036
2242
3037
ret_errno = lower_privileges_permanently();
3038
if(ret_errno != 0){
3039
errno = ret_errno;
3040
perror_plus("Failed to lower privileges permanently");
2243
/* Take down the network interface */
2244
if(take_down_interface and geteuid() == 0){
2245
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2246
if(ret == -1){
2247
perror_plus("ioctl SIOCGIFFLAGS");
2248
} else if(network.ifr_flags & IFF_UP){
2249
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2250
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2251
if(ret == -1){
2252
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2253
}
2254
}
2255
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2256
if(ret == -1){
2257
perror_plus("close");
2258
}
3041
2259
}
3042
2260
}
3043
3044
free(interfaces_to_take_down);
3045
free(interfaces_hooks);
2261
/* Lower privileges permanently */
2262
errno = 0;
2263
ret = setuid(uid);
2264
if(ret == -1){
2265
perror_plus("setuid");
2266
}
3046
2267
3047
2268
/* Removes the GPGME temp directory and all files inside */
3048
if(tempdir != NULL){
2269
if(tempdir_created){
3049
2270
struct dirent **direntries = NULL;
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
}
2271
struct dirent *direntry = NULL;
2272
int numentries = scandir(tempdir, &direntries, notdotentries,
2273
alphasort);
2274
if (numentries > 0){
2275
for(int i = 0; i < numentries; i++){
2276
direntry = direntries[i];
2277
char *fullname = NULL;
2278
ret = asprintf(&fullname, "%s/%s", tempdir,
2279
direntry->d_name);
2280
if(ret < 0){
2281
perror_plus("asprintf");
2282
continue;
2283
}
2284
ret = remove(fullname);
2285
if(ret == -1){
2286
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2287
strerror(errno));
2288
}
2289
free(fullname);
3089
2290
}
3090
close(tempdir_fd);
2291
}
2292
2293
/* need to clean even if 0 because man page doesn't specify */
2294
free(direntries);
2295
if (numentries == -1){
2296
perror_plus("scandir");
2297
}
2298
ret = rmdir(tempdir);
2299
if(ret == -1 and errno != ENOENT){
2300
perror_plus("rmdir");
3091
2301
}
3092
2302
}
3093
2303
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0