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- Committer: teddy at bsnet
- Date: 2011-12-24 19:43:48 UTC
- mfrom: (505.1.27 teddy)
- Revision ID: teddy@fukt.bsnet.se-20111224194348-0buonmve2dnwcnzw
Merge from Teddy
- files removed:
- bugs.xml
- 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 © 2008-2017 Teddy Hogeborn
13
* Copyright © 2008-2017 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(), strsignal()
51
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
52
51
#include <sys/ioctl.h> /* ioctl */
53
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
54
53
sockaddr_in6, PF_INET6,
56
55
opendir(), DIR */
57
56
#include <sys/stat.h> /* open(), S_ISREG */
58
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
59
inet_pton(), connect(),
60
getnameinfo() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
62
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
63
61
*/
64
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
65
63
strtoimax() */
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
71
66
program_invocation_short_name */
72
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
78
73
*/
79
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
80
75
getuid(), getgid(), seteuid(),
81
setgid(), pause(), _exit(),
82
unlinkat() */
83
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
84
78
#include <iso646.h> /* not, or, and */
85
79
#include <argp.h> /* struct argp_option, error_t, struct
86
80
argp_state, struct argp,
94
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
95
89
WEXITSTATUS(), WTERMSIG() */
96
90
#include <grp.h> /* setgroups() */
97
#include <argz.h> /* argz_add_sep(), argz_next(),
98
argz_delete(), argz_append(),
99
argz_stringify(), argz_add(),
100
argz_count() */
101
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
102
EAI_SYSTEM, gai_strerror() */
103
91
104
92
#ifdef __linux__
105
93
#include <sys/klog.h> /* klogctl() */
147
135
static const char sys_class_net[] = "/sys/class/net";
148
136
char *connect_to = NULL;
149
137
const char *hookdir = HOOKDIR;
150
int hookdir_fd = -1;
151
uid_t uid = 65534;
152
gid_t gid = 65534;
153
138
154
139
/* Doubly linked list that need to be circularly linked when used */
155
140
typedef struct server{
156
141
const char *ip;
157
in_port_t port;
142
uint16_t port;
158
143
AvahiIfIndex if_index;
159
144
int af;
160
145
struct timespec last_seen;
164
149
165
150
/* Used for passing in values through the Avahi callback functions */
166
151
typedef struct {
152
AvahiSimplePoll *simple_poll;
167
153
AvahiServer *server;
168
154
gnutls_certificate_credentials_t cred;
169
155
unsigned int dh_bits;
171
157
const char *priority;
172
158
gpgme_ctx_t ctx;
173
159
server *current_server;
174
char *interfaces;
175
size_t interfaces_size;
176
160
} mandos_context;
177
161
178
/* global so signal handler can reach it*/
179
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 };
180
167
181
168
sig_atomic_t quit_now = 0;
182
169
int signal_received = 0;
183
170
184
171
/* Function to use when printing errors */
185
172
void perror_plus(const char *print_text){
186
int e = errno;
187
173
fprintf(stderr, "Mandos plugin %s: ",
188
174
program_invocation_short_name);
189
errno = e;
190
175
perror(print_text);
191
176
}
192
177
193
__attribute__((format (gnu_printf, 2, 3), nonnull))
194
178
int fprintf_plus(FILE *stream, const char *format, ...){
195
179
va_list ap;
196
180
va_start (ap, format);
197
181
198
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
199
183
program_invocation_short_name));
200
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
201
185
}
202
186
203
187
/*
205
189
* bytes. "buffer_capacity" is how much is currently allocated,
206
190
* "buffer_length" is how much is already used.
207
191
*/
208
__attribute__((nonnull, warn_unused_result))
209
192
size_t incbuffer(char **buffer, size_t buffer_length,
210
193
size_t buffer_capacity){
211
194
if(buffer_length + BUFFER_SIZE > buffer_capacity){
212
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
if(new_buf == NULL){
214
int old_errno = errno;
215
free(*buffer);
216
errno = old_errno;
217
*buffer = NULL;
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
if(buffer == NULL){
218
197
return 0;
219
198
}
220
*buffer = new_buf;
221
199
buffer_capacity += BUFFER_SIZE;
222
200
}
223
201
return buffer_capacity;
224
202
}
225
203
226
204
/* Add server to set of servers to retry periodically */
227
__attribute__((nonnull, warn_unused_result))
228
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
229
int af, server **current_server){
205
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
230
207
int ret;
231
208
server *new_server = malloc(sizeof(server));
232
209
if(new_server == NULL){
239
216
.af = af };
240
217
if(new_server->ip == NULL){
241
218
perror_plus("strdup");
242
free(new_server);
243
return false;
244
}
245
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
246
if(ret == -1){
247
perror_plus("clock_gettime");
248
#ifdef __GNUC__
249
#pragma GCC diagnostic push
250
#pragma GCC diagnostic ignored "-Wcast-qual"
251
#endif
252
free((char *)(new_server->ip));
253
#ifdef __GNUC__
254
#pragma GCC diagnostic pop
255
#endif
256
free(new_server);
257
219
return false;
258
220
}
259
221
/* Special case of first server */
260
if(*current_server == NULL){
222
if (mc.current_server == NULL){
261
223
new_server->next = new_server;
262
224
new_server->prev = new_server;
263
*current_server = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
264
227
} else {
265
/* Place the new server last in the list */
266
new_server->next = *current_server;
267
new_server->prev = (*current_server)->prev;
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
268
230
new_server->prev->next = new_server;
269
(*current_server)->prev = new_server;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return false;
270
237
}
271
238
return true;
272
239
}
274
241
/*
275
242
* Initialize GPGME.
276
243
*/
277
__attribute__((nonnull, warn_unused_result))
278
static bool init_gpgme(const char * const seckey,
279
const char * const pubkey,
280
const char * const tempdir,
281
mandos_context *mc){
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
282
246
gpgme_error_t rc;
283
247
gpgme_engine_info_t engine_info;
284
248
249
285
250
/*
286
251
* Helper function to insert pub and seckey to the engine keyring.
287
252
*/
288
bool import_key(const char * const filename){
253
bool import_key(const char *filename){
289
254
int ret;
290
255
int fd;
291
256
gpgme_data_t pgp_data;
303
268
return false;
304
269
}
305
270
306
rc = gpgme_op_import(mc->ctx, pgp_data);
271
rc = gpgme_op_import(mc.ctx, pgp_data);
307
272
if(rc != GPG_ERR_NO_ERROR){
308
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
309
274
gpgme_strsource(rc), gpgme_strerror(rc));
310
275
return false;
311
276
}
312
277
313
ret = close(fd);
278
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
279
if(ret == -1){
315
280
perror_plus("close");
316
281
}
353
318
}
354
319
355
320
/* Create new GPGME "context" */
356
rc = gpgme_new(&(mc->ctx));
321
rc = gpgme_new(&(mc.ctx));
357
322
if(rc != GPG_ERR_NO_ERROR){
358
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
359
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
372
337
* Decrypt OpenPGP data.
373
338
* Returns -1 on error
374
339
*/
375
__attribute__((nonnull, warn_unused_result))
376
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
377
341
size_t crypto_size,
378
char **plaintext,
379
mandos_context *mc){
342
char **plaintext){
380
343
gpgme_data_t dh_crypto, dh_plain;
381
344
gpgme_error_t rc;
382
345
ssize_t ret;
408
371
409
372
/* Decrypt data from the cryptotext data buffer to the plaintext
410
373
data buffer */
411
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
412
375
if(rc != GPG_ERR_NO_ERROR){
413
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
414
377
gpgme_strsource(rc), gpgme_strerror(rc));
415
378
plaintext_length = -1;
416
379
if(debug){
417
380
gpgme_decrypt_result_t result;
418
result = gpgme_op_decrypt_result(mc->ctx);
381
result = gpgme_op_decrypt_result(mc.ctx);
419
382
if(result == NULL){
420
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
421
384
} else {
498
461
return plaintext_length;
499
462
}
500
463
501
__attribute__((warn_unused_result, const))
502
static const char *safe_string(const char *str){
503
if(str == NULL)
504
return "(unknown)";
505
return str;
506
}
507
508
__attribute__((warn_unused_result))
509
static const char *safer_gnutls_strerror(int value){
510
const char *ret = gnutls_strerror(value);
511
return safe_string(ret);
464
static const char * safer_gnutls_strerror(int value){
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
467
if(ret == NULL)
468
ret = "(unknown)";
469
return ret;
512
470
}
513
471
514
472
/* GnuTLS log function callback */
515
__attribute__((nonnull))
516
473
static void debuggnutls(__attribute__((unused)) int level,
517
474
const char* string){
518
475
fprintf_plus(stderr, "GnuTLS: %s", string);
519
476
}
520
477
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
522
478
static int init_gnutls_global(const char *pubkeyfilename,
523
const char *seckeyfilename,
524
const char *dhparamsfilename,
525
mandos_context *mc){
479
const char *seckeyfilename){
526
480
int ret;
527
unsigned int uret;
528
481
529
482
if(debug){
530
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
531
484
}
532
485
486
ret = gnutls_global_init();
487
if(ret != GNUTLS_E_SUCCESS){
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
490
return -1;
491
}
492
533
493
if(debug){
534
494
/* "Use a log level over 10 to enable all debugging options."
535
495
* - GnuTLS manual
539
499
}
540
500
541
501
/* OpenPGP credentials */
542
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
543
503
if(ret != GNUTLS_E_SUCCESS){
544
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
505
safer_gnutls_strerror(ret));
506
gnutls_global_deinit();
546
507
return -1;
547
508
}
548
509
554
515
}
555
516
556
517
ret = gnutls_certificate_set_openpgp_key_file
557
(mc->cred, pubkeyfilename, seckeyfilename,
518
(mc.cred, pubkeyfilename, seckeyfilename,
558
519
GNUTLS_OPENPGP_FMT_BASE64);
559
520
if(ret != GNUTLS_E_SUCCESS){
560
521
fprintf_plus(stderr,
566
527
}
567
528
568
529
/* GnuTLS server initialization */
569
ret = gnutls_dh_params_init(&mc->dh_params);
530
ret = gnutls_dh_params_init(&mc.dh_params);
570
531
if(ret != GNUTLS_E_SUCCESS){
571
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
572
533
" initialization: %s\n",
573
534
safer_gnutls_strerror(ret));
574
535
goto globalfail;
575
536
}
576
/* If a Diffie-Hellman parameters file was given, try to use it */
577
if(dhparamsfilename != NULL){
578
gnutls_datum_t params = { .data = NULL, .size = 0 };
579
do {
580
int dhpfile = open(dhparamsfilename, O_RDONLY);
581
if(dhpfile == -1){
582
perror_plus("open");
583
dhparamsfilename = NULL;
584
break;
585
}
586
size_t params_capacity = 0;
587
while(true){
588
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params.size,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
592
perror_plus("incbuffer");
593
free(params.data);
594
params.data = NULL;
595
dhparamsfilename = NULL;
596
break;
597
}
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
600
BUFFER_SIZE);
601
/* EOF */
602
if(bytes_read == 0){
603
break;
604
}
605
/* check bytes_read for failure */
606
if(bytes_read < 0){
607
perror_plus("read");
608
free(params.data);
609
params.data = NULL;
610
dhparamsfilename = NULL;
611
break;
612
}
613
params.size += (unsigned int)bytes_read;
614
}
615
if(params.data == NULL){
616
dhparamsfilename = NULL;
617
}
618
if(dhparamsfilename == NULL){
619
break;
620
}
621
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
622
GNUTLS_X509_FMT_PEM);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Failed to parse DH parameters in file"
625
" \"%s\": %s\n", dhparamsfilename,
626
safer_gnutls_strerror(ret));
627
dhparamsfilename = NULL;
628
}
629
free(params.data);
630
} while(false);
631
}
632
if(dhparamsfilename == NULL){
633
if(mc->dh_bits == 0){
634
/* Find out the optimal number of DH bits */
635
/* Try to read the private key file */
636
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
637
do {
638
int secfile = open(seckeyfilename, O_RDONLY);
639
if(secfile == -1){
640
perror_plus("open");
641
break;
642
}
643
size_t buffer_capacity = 0;
644
while(true){
645
buffer_capacity = incbuffer((char **)&buffer.data,
646
(size_t)buffer.size,
647
(size_t)buffer_capacity);
648
if(buffer_capacity == 0){
649
perror_plus("incbuffer");
650
free(buffer.data);
651
buffer.data = NULL;
652
break;
653
}
654
ssize_t bytes_read = read(secfile,
655
buffer.data + buffer.size,
656
BUFFER_SIZE);
657
/* EOF */
658
if(bytes_read == 0){
659
break;
660
}
661
/* check bytes_read for failure */
662
if(bytes_read < 0){
663
perror_plus("read");
664
free(buffer.data);
665
buffer.data = NULL;
666
break;
667
}
668
buffer.size += (unsigned int)bytes_read;
669
}
670
close(secfile);
671
} while(false);
672
/* If successful, use buffer to parse private key */
673
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
674
if(buffer.data != NULL){
675
{
676
gnutls_openpgp_privkey_t privkey = NULL;
677
ret = gnutls_openpgp_privkey_init(&privkey);
678
if(ret != GNUTLS_E_SUCCESS){
679
fprintf_plus(stderr, "Error initializing OpenPGP key"
680
" structure: %s",
681
safer_gnutls_strerror(ret));
682
free(buffer.data);
683
buffer.data = NULL;
684
} else {
685
ret = gnutls_openpgp_privkey_import
686
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
687
if(ret != GNUTLS_E_SUCCESS){
688
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
689
safer_gnutls_strerror(ret));
690
privkey = NULL;
691
}
692
free(buffer.data);
693
buffer.data = NULL;
694
if(privkey != NULL){
695
/* Use private key to suggest an appropriate
696
sec_param */
697
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
698
gnutls_openpgp_privkey_deinit(privkey);
699
if(debug){
700
fprintf_plus(stderr, "This OpenPGP key implies using"
701
" a GnuTLS security parameter \"%s\".\n",
702
safe_string(gnutls_sec_param_get_name
703
(sec_param)));
704
}
705
}
706
}
707
}
708
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
709
/* Err on the side of caution */
710
sec_param = GNUTLS_SEC_PARAM_ULTRA;
711
if(debug){
712
fprintf_plus(stderr, "Falling back to security parameter"
713
" \"%s\"\n",
714
safe_string(gnutls_sec_param_get_name
715
(sec_param)));
716
}
717
}
718
}
719
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
720
if(uret != 0){
721
mc->dh_bits = uret;
722
if(debug){
723
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
724
" implies %u DH bits; using that.\n",
725
safe_string(gnutls_sec_param_get_name
726
(sec_param)),
727
mc->dh_bits);
728
}
729
} else {
730
fprintf_plus(stderr, "Failed to get implied number of DH"
731
" bits for security parameter \"%s\"): %s\n",
732
safe_string(gnutls_sec_param_get_name
733
(sec_param)),
734
safer_gnutls_strerror(ret));
735
goto globalfail;
736
}
737
} else if(debug){
738
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
739
mc->dh_bits);
740
}
741
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
742
if(ret != GNUTLS_E_SUCCESS){
743
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
744
" bits): %s\n", mc->dh_bits,
745
safer_gnutls_strerror(ret));
746
goto globalfail;
747
}
748
}
749
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
538
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
541
goto globalfail;
542
}
543
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
750
545
751
546
return 0;
752
547
753
548
globalfail:
754
549
755
gnutls_certificate_free_credentials(mc->cred);
756
gnutls_dh_params_deinit(mc->dh_params);
550
gnutls_certificate_free_credentials(mc.cred);
551
gnutls_global_deinit();
552
gnutls_dh_params_deinit(mc.dh_params);
757
553
return -1;
758
554
}
759
555
760
__attribute__((nonnull, warn_unused_result))
761
static int init_gnutls_session(gnutls_session_t *session,
762
mandos_context *mc){
556
static int init_gnutls_session(gnutls_session_t *session){
763
557
int ret;
764
558
/* GnuTLS session creation */
765
559
do {
777
571
{
778
572
const char *err;
779
573
do {
780
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
781
575
if(quit_now){
782
576
gnutls_deinit(*session);
783
577
return -1;
794
588
795
589
do {
796
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
797
mc->cred);
591
mc.cred);
798
592
if(quit_now){
799
593
gnutls_deinit(*session);
800
594
return -1;
810
604
/* ignore client certificate if any. */
811
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
812
606
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
608
813
609
return 0;
814
610
}
815
611
817
613
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
818
614
__attribute__((unused)) const char *txt){}
819
615
820
/* Set effective uid to 0, return errno */
821
__attribute__((warn_unused_result))
822
int raise_privileges(void){
823
int old_errno = errno;
824
int ret = 0;
825
if(seteuid(0) == -1){
826
ret = errno;
827
}
828
errno = old_errno;
829
return ret;
830
}
831
832
/* Set effective and real user ID to 0. Return errno. */
833
__attribute__((warn_unused_result))
834
int raise_privileges_permanently(void){
835
int old_errno = errno;
836
int ret = raise_privileges();
837
if(ret != 0){
838
errno = old_errno;
839
return ret;
840
}
841
if(setuid(0) == -1){
842
ret = errno;
843
}
844
errno = old_errno;
845
return ret;
846
}
847
848
/* Set effective user ID to unprivileged saved user ID */
849
__attribute__((warn_unused_result))
850
int lower_privileges(void){
851
int old_errno = errno;
852
int ret = 0;
853
if(seteuid(uid) == -1){
854
ret = errno;
855
}
856
errno = old_errno;
857
return ret;
858
}
859
860
/* Lower privileges permanently */
861
__attribute__((warn_unused_result))
862
int lower_privileges_permanently(void){
863
int old_errno = errno;
864
int ret = 0;
865
if(setuid(uid) == -1){
866
ret = errno;
867
}
868
errno = old_errno;
869
return ret;
870
}
871
872
/* Helper function to add_local_route() and delete_local_route() */
873
__attribute__((nonnull, warn_unused_result))
874
static bool add_delete_local_route(const bool add,
875
const char *address,
876
AvahiIfIndex if_index){
877
int ret;
878
char helper[] = "mandos-client-iprouteadddel";
879
char add_arg[] = "add";
880
char delete_arg[] = "delete";
881
char debug_flag[] = "--debug";
882
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
883
if(pluginhelperdir == NULL){
884
if(debug){
885
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
886
" variable not set; cannot run helper\n");
887
}
888
return false;
889
}
890
891
char interface[IF_NAMESIZE];
892
if(if_indextoname((unsigned int)if_index, interface) == NULL){
893
perror_plus("if_indextoname");
894
return false;
895
}
896
897
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
898
if(devnull == -1){
899
perror_plus("open(\"/dev/null\", O_RDONLY)");
900
return false;
901
}
902
pid_t pid = fork();
903
if(pid == 0){
904
/* Child */
905
/* Raise privileges */
906
errno = raise_privileges_permanently();
907
if(errno != 0){
908
perror_plus("Failed to raise privileges");
909
/* _exit(EX_NOPERM); */
910
} else {
911
/* Set group */
912
errno = 0;
913
ret = setgid(0);
914
if(ret == -1){
915
perror_plus("setgid");
916
_exit(EX_NOPERM);
917
}
918
/* Reset supplementary groups */
919
errno = 0;
920
ret = setgroups(0, NULL);
921
if(ret == -1){
922
perror_plus("setgroups");
923
_exit(EX_NOPERM);
924
}
925
}
926
ret = dup2(devnull, STDIN_FILENO);
927
if(ret == -1){
928
perror_plus("dup2(devnull, STDIN_FILENO)");
929
_exit(EX_OSERR);
930
}
931
ret = close(devnull);
932
if(ret == -1){
933
perror_plus("close");
934
_exit(EX_OSERR);
935
}
936
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
937
if(ret == -1){
938
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
939
_exit(EX_OSERR);
940
}
941
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
942
O_RDONLY
943
| O_DIRECTORY
944
| O_PATH
945
| O_CLOEXEC));
946
if(helperdir_fd == -1){
947
perror_plus("open");
948
_exit(EX_UNAVAILABLE);
949
}
950
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
951
helper, O_RDONLY));
952
if(helper_fd == -1){
953
perror_plus("openat");
954
close(helperdir_fd);
955
_exit(EX_UNAVAILABLE);
956
}
957
close(helperdir_fd);
958
#ifdef __GNUC__
959
#pragma GCC diagnostic push
960
#pragma GCC diagnostic ignored "-Wcast-qual"
961
#endif
962
if(fexecve(helper_fd, (char *const [])
963
{ helper, add ? add_arg : delete_arg, (char *)address,
964
interface, debug ? debug_flag : NULL, NULL },
965
environ) == -1){
966
#ifdef __GNUC__
967
#pragma GCC diagnostic pop
968
#endif
969
perror_plus("fexecve");
970
_exit(EXIT_FAILURE);
971
}
972
}
973
if(pid == -1){
974
perror_plus("fork");
975
return false;
976
}
977
int status;
978
pid_t pret = -1;
979
errno = 0;
980
do {
981
pret = waitpid(pid, &status, 0);
982
if(pret == -1 and errno == EINTR and quit_now){
983
int errno_raising = 0;
984
if((errno = raise_privileges()) != 0){
985
errno_raising = errno;
986
perror_plus("Failed to raise privileges in order to"
987
" kill helper program");
988
}
989
if(kill(pid, SIGTERM) == -1){
990
perror_plus("kill");
991
}
992
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
993
perror_plus("Failed to lower privileges after killing"
994
" helper program");
995
}
996
return false;
997
}
998
} while(pret == -1 and errno == EINTR);
999
if(pret == -1){
1000
perror_plus("waitpid");
1001
return false;
1002
}
1003
if(WIFEXITED(status)){
1004
if(WEXITSTATUS(status) != 0){
1005
fprintf_plus(stderr, "Error: iprouteadddel exited"
1006
" with status %d\n", WEXITSTATUS(status));
1007
return false;
1008
}
1009
return true;
1010
}
1011
if(WIFSIGNALED(status)){
1012
fprintf_plus(stderr, "Error: iprouteadddel died by"
1013
" signal %d\n", WTERMSIG(status));
1014
return false;
1015
}
1016
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1017
return false;
1018
}
1019
1020
__attribute__((nonnull, warn_unused_result))
1021
static bool add_local_route(const char *address,
1022
AvahiIfIndex if_index){
1023
if(debug){
1024
fprintf_plus(stderr, "Adding route to %s\n", address);
1025
}
1026
return add_delete_local_route(true, address, if_index);
1027
}
1028
1029
__attribute__((nonnull, warn_unused_result))
1030
static bool delete_local_route(const char *address,
1031
AvahiIfIndex if_index){
1032
if(debug){
1033
fprintf_plus(stderr, "Removing route to %s\n", address);
1034
}
1035
return add_delete_local_route(false, address, if_index);
1036
}
1037
1038
616
/* Called when a Mandos server is found */
1039
__attribute__((nonnull, warn_unused_result))
1040
static int start_mandos_communication(const char *ip, in_port_t port,
617
static int start_mandos_communication(const char *ip, uint16_t port,
1041
618
AvahiIfIndex if_index,
1042
int af, mandos_context *mc){
619
int af){
1043
620
int ret, tcp_sd = -1;
1044
621
ssize_t sret;
1045
struct sockaddr_storage to;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
1046
626
char *buffer = NULL;
1047
627
char *decrypted_buffer = NULL;
1048
628
size_t buffer_length = 0;
1051
631
int retval = -1;
1052
632
gnutls_session_t session;
1053
633
int pf; /* Protocol family */
1054
bool route_added = false;
1055
634
1056
635
errno = 0;
1057
636
1073
652
return -1;
1074
653
}
1075
654
1076
/* If the interface is specified and we have a list of interfaces */
1077
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1078
/* Check if the interface is one of the interfaces we are using */
1079
bool match = false;
1080
{
1081
char *interface = NULL;
1082
while((interface = argz_next(mc->interfaces,
1083
mc->interfaces_size,
1084
interface))){
1085
if(if_nametoindex(interface) == (unsigned int)if_index){
1086
match = true;
1087
break;
1088
}
1089
}
1090
}
1091
if(not match){
1092
/* This interface does not match any in the list, so we don't
1093
connect to the server */
1094
if(debug){
1095
char interface[IF_NAMESIZE];
1096
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1097
perror_plus("if_indextoname");
1098
} else {
1099
fprintf_plus(stderr, "Skipping server on non-used interface"
1100
" \"%s\"\n",
1101
if_indextoname((unsigned int)if_index,
1102
interface));
1103
}
1104
}
1105
return -1;
1106
}
1107
}
1108
1109
ret = init_gnutls_session(&session, mc);
655
ret = init_gnutls_session(&session);
1110
656
if(ret != 0){
1111
657
return -1;
1112
658
}
1113
659
1114
660
if(debug){
1115
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1116
PRIuMAX "\n", ip, (uintmax_t)port);
662
PRIu16 "\n", ip, port);
1117
663
}
1118
664
1119
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
1120
666
if(tcp_sd < 0){
1121
667
int e = errno;
1122
668
perror_plus("socket");
1129
675
goto mandos_end;
1130
676
}
1131
677
678
memset(&to, 0, sizeof(to));
1132
679
if(af == AF_INET6){
1133
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1134
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1135
ret = inet_pton(af, ip, &to6->sin6_addr);
680
to.in6.sin6_family = (sa_family_t)af;
681
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1136
682
} else { /* IPv4 */
1137
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1138
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1139
ret = inet_pton(af, ip, &to4->sin_addr);
683
to.in.sin_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in.sin_addr);
1140
685
}
1141
686
if(ret < 0 ){
1142
687
int e = errno;
1151
696
goto mandos_end;
1152
697
}
1153
698
if(af == AF_INET6){
1154
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1155
if(IN6_IS_ADDR_LINKLOCAL
1156
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
1157
706
if(if_index == AVAHI_IF_UNSPEC){
1158
707
fprintf_plus(stderr, "An IPv6 link-local address is"
1159
708
" incomplete without a network interface\n");
1161
710
goto mandos_end;
1162
711
}
1163
712
/* Set the network interface number as scope */
1164
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
713
to.in6.sin6_scope_id = (uint32_t)if_index;
1165
714
}
1166
715
} else {
1167
((struct sockaddr_in *)&to)->sin_port = htons(port);
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
1168
719
}
1169
720
1170
721
if(quit_now){
1178
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1179
730
perror_plus("if_indextoname");
1180
731
} else {
1181
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1182
"\n", ip, interface, (uintmax_t)port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
1183
734
}
1184
735
} else {
1185
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1186
ip, (uintmax_t)port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
1187
738
}
1188
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1189
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1190
if(af == AF_INET6){
1191
ret = getnameinfo((struct sockaddr *)&to,
1192
sizeof(struct sockaddr_in6),
1193
addrstr, sizeof(addrstr), NULL, 0,
1194
NI_NUMERICHOST);
1195
} else {
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in),
1198
addrstr, sizeof(addrstr), NULL, 0,
1199
NI_NUMERICHOST);
1200
}
1201
if(ret == EAI_SYSTEM){
1202
perror_plus("getnameinfo");
1203
} else if(ret != 0) {
1204
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1205
} else if(strcmp(addrstr, ip) != 0){
1206
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1207
}
1208
}
1209
1210
if(quit_now){
1211
errno = EINTR;
1212
goto mandos_end;
1213
}
1214
1215
while(true){
1216
if(af == AF_INET6){
1217
ret = connect(tcp_sd, (struct sockaddr *)&to,
1218
sizeof(struct sockaddr_in6));
1219
} else {
1220
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1221
sizeof(struct sockaddr_in));
1222
}
1223
if(ret < 0){
1224
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1225
and if_index != AVAHI_IF_UNSPEC
1226
and connect_to == NULL
1227
and not route_added and
1228
((af == AF_INET6 and not
1229
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1230
&to)->sin6_addr)))
1231
or (af == AF_INET and
1232
/* Not a a IPv4LL address */
1233
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1234
& 0xFFFF0000L) != 0xA9FE0000L))){
1235
/* Work around Avahi bug - Avahi does not announce link-local
1236
addresses if it has a global address, so local hosts with
1237
*only* a link-local address (e.g. Mandos clients) cannot
1238
connect to a Mandos server announced by Avahi on a server
1239
host with a global address. Work around this by retrying
1240
with an explicit route added with the server's address.
1241
1242
Avahi bug reference:
1243
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://bugs.debian.org/587961
1245
*/
1246
if(debug){
1247
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
" direct route\n");
1249
}
1250
int e = errno;
1251
route_added = add_local_route(ip, if_index);
1252
if(route_added){
1253
continue;
1254
}
1255
errno = e;
1256
}
1257
if(errno != ECONNREFUSED or debug){
1258
int e = errno;
1259
perror_plus("connect");
1260
errno = e;
1261
}
1262
goto mandos_end;
1263
}
1264
1265
if(quit_now){
1266
errno = EINTR;
1267
goto mandos_end;
1268
}
1269
break;
741
const char *pcret;
742
if(af == AF_INET6){
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
745
} else {
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
748
}
749
if(pcret == NULL){
750
perror_plus("inet_ntop");
751
} else {
752
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
754
}
755
}
756
}
757
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
761
}
762
763
if(af == AF_INET6){
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
765
} else {
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
767
}
768
if(ret < 0){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
int e = errno;
771
perror_plus("connect");
772
errno = e;
773
}
774
goto mandos_end;
775
}
776
777
if(quit_now){
778
errno = EINTR;
779
goto mandos_end;
1270
780
}
1271
781
1272
782
const char *out = mandos_protocol_version;
1308
818
goto mandos_end;
1309
819
}
1310
820
1311
/* This casting via intptr_t is to eliminate warning about casting
1312
an int to a pointer type. This is exactly how the GnuTLS Guile
1313
function "set-session-transport-fd!" does it. */
1314
gnutls_transport_set_ptr(session,
1315
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
821
/* Spurious warning from -Wint-to-pointer-cast */
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1316
823
1317
824
if(quit_now){
1318
825
errno = EINTR;
1423
930
if(buffer_length > 0){
1424
931
ssize_t decrypted_buffer_size;
1425
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1426
&decrypted_buffer, mc);
933
&decrypted_buffer);
1427
934
if(decrypted_buffer_size >= 0){
1428
935
1429
clearerr(stdout);
1430
936
written = 0;
1431
937
while(written < (size_t) decrypted_buffer_size){
1432
938
if(quit_now){
1448
954
}
1449
955
written += (size_t)ret;
1450
956
}
1451
ret = fflush(stdout);
1452
if(ret != 0){
1453
int e = errno;
1454
if(debug){
1455
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1456
strerror(errno));
1457
}
1458
errno = e;
1459
goto mandos_end;
1460
}
1461
957
retval = 0;
1462
958
}
1463
959
}
1466
962
1467
963
mandos_end:
1468
964
{
1469
if(route_added){
1470
if(not delete_local_route(ip, if_index)){
1471
fprintf_plus(stderr, "Failed to delete local route to %s on"
1472
" interface %d", ip, if_index);
1473
}
1474
}
1475
965
int e = errno;
1476
966
free(decrypted_buffer);
1477
967
free(buffer);
1478
968
if(tcp_sd >= 0){
1479
ret = close(tcp_sd);
969
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1480
970
}
1481
971
if(ret == -1){
1482
972
if(e == 0){
1507
997
AVAHI_GCC_UNUSED AvahiStringList *txt,
1508
998
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1509
999
flags,
1510
void *mc){
1511
if(r == NULL){
1512
return;
1513
}
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1514
1002
1515
1003
/* Called whenever a service has been resolved successfully or
1516
1004
timed out */
1517
1005
1518
1006
if(quit_now){
1519
avahi_s_service_resolver_free(r);
1520
1007
return;
1521
1008
}
1522
1009
1526
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1527
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1528
1015
domain,
1529
avahi_strerror(avahi_server_errno
1530
(((mandos_context*)mc)->server)));
1016
avahi_strerror(avahi_server_errno(mc.server)));
1531
1017
break;
1532
1018
1533
1019
case AVAHI_RESOLVER_FOUND:
1539
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1540
1026
host_name, ip, (intmax_t)interface, port);
1541
1027
}
1542
int ret = start_mandos_communication(ip, (in_port_t)port,
1543
interface,
1544
avahi_proto_to_af(proto),
1545
mc);
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1546
1030
if(ret == 0){
1547
avahi_simple_poll_quit(simple_poll);
1031
avahi_simple_poll_quit(mc.simple_poll);
1548
1032
} else {
1549
if(not add_server(ip, (in_port_t)port, interface,
1550
avahi_proto_to_af(proto),
1551
&((mandos_context*)mc)->current_server)){
1033
if(not add_server(ip, port, interface,
1034
avahi_proto_to_af(proto))){
1552
1035
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1553
1036
" list\n", name);
1554
1037
}
1567
1050
const char *domain,
1568
1051
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1569
1052
flags,
1570
void *mc){
1571
if(b == NULL){
1572
return;
1573
}
1053
AVAHI_GCC_UNUSED void* userdata){
1054
assert(b);
1574
1055
1575
1056
/* Called whenever a new services becomes available on the LAN or
1576
1057
is removed from the LAN */
1584
1065
case AVAHI_BROWSER_FAILURE:
1585
1066
1586
1067
fprintf_plus(stderr, "(Avahi browser) %s\n",
1587
avahi_strerror(avahi_server_errno
1588
(((mandos_context*)mc)->server)));
1589
avahi_simple_poll_quit(simple_poll);
1068
avahi_strerror(avahi_server_errno(mc.server)));
1069
avahi_simple_poll_quit(mc.simple_poll);
1590
1070
return;
1591
1071
1592
1072
case AVAHI_BROWSER_NEW:
1595
1075
the callback function is called the Avahi server will free the
1596
1076
resolver for us. */
1597
1077
1598
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1599
interface, protocol, name, type,
1600
domain, protocol, 0,
1601
resolve_callback, mc) == NULL)
1078
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1079
name, type, domain, protocol, 0,
1080
resolve_callback, NULL) == NULL)
1602
1081
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1603
1082
" %s\n", name,
1604
avahi_strerror(avahi_server_errno
1605
(((mandos_context*)mc)->server)));
1083
avahi_strerror(avahi_server_errno(mc.server)));
1606
1084
break;
1607
1085
1608
1086
case AVAHI_BROWSER_REMOVE:
1627
1105
signal_received = sig;
1628
1106
int old_errno = errno;
1629
1107
/* set main loop to exit */
1630
if(simple_poll != NULL){
1631
avahi_simple_poll_quit(simple_poll);
1108
if(mc.simple_poll != NULL){
1109
avahi_simple_poll_quit(mc.simple_poll);
1632
1110
}
1633
1111
errno = old_errno;
1634
1112
}
1635
1113
1636
__attribute__((nonnull, warn_unused_result))
1637
1114
bool get_flags(const char *ifname, struct ifreq *ifr){
1638
1115
int ret;
1639
int old_errno;
1640
1116
1641
1117
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1642
1118
if(s < 0){
1643
old_errno = errno;
1644
1119
perror_plus("socket");
1645
errno = old_errno;
1646
1120
return false;
1647
1121
}
1648
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1649
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1122
strcpy(ifr->ifr_name, ifname);
1650
1123
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1651
1124
if(ret == -1){
1652
1125
if(debug){
1653
old_errno = errno;
1654
1126
perror_plus("ioctl SIOCGIFFLAGS");
1655
errno = old_errno;
1656
1127
}
1657
1128
return false;
1658
1129
}
1659
1130
return true;
1660
1131
}
1661
1132
1662
__attribute__((nonnull, warn_unused_result))
1663
1133
bool good_flags(const char *ifname, const struct ifreq *ifr){
1664
1134
1665
1135
/* Reject the loopback device */
1707
1177
* corresponds to an acceptable network device.
1708
1178
* (This function is passed to scandir(3) as a filter function.)
1709
1179
*/
1710
__attribute__((nonnull, warn_unused_result))
1711
1180
int good_interface(const struct dirent *if_entry){
1712
1181
if(if_entry->d_name[0] == '.'){
1713
1182
return 0;
1729
1198
}
1730
1199
1731
1200
/*
1732
* This function determines if a network interface is up.
1733
*/
1734
__attribute__((nonnull, warn_unused_result))
1735
bool interface_is_up(const char *interface){
1736
struct ifreq ifr;
1737
if(not get_flags(interface, &ifr)){
1738
if(debug){
1739
fprintf_plus(stderr, "Failed to get flags for interface "
1740
"\"%s\"\n", interface);
1741
}
1742
return false;
1743
}
1744
1745
return (bool)(ifr.ifr_flags & IFF_UP);
1746
}
1747
1748
/*
1749
* This function determines if a network interface is running
1750
*/
1751
__attribute__((nonnull, warn_unused_result))
1752
bool interface_is_running(const char *interface){
1753
struct ifreq ifr;
1754
if(not get_flags(interface, &ifr)){
1755
if(debug){
1756
fprintf_plus(stderr, "Failed to get flags for interface "
1757
"\"%s\"\n", interface);
1758
}
1759
return false;
1760
}
1761
1762
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1763
}
1764
1765
__attribute__((nonnull, pure, warn_unused_result))
1201
* This function determines if a directory entry in /sys/class/net
1202
* corresponds to an acceptable network device which is up.
1203
* (This function is passed to scandir(3) as a filter function.)
1204
*/
1205
int up_interface(const struct dirent *if_entry){
1206
if(if_entry->d_name[0] == '.'){
1207
return 0;
1208
}
1209
1210
struct ifreq ifr;
1211
if(not get_flags(if_entry->d_name, &ifr)){
1212
if(debug){
1213
fprintf_plus(stderr, "Failed to get flags for interface "
1214
"\"%s\"\n", if_entry->d_name);
1215
}
1216
return 0;
1217
}
1218
1219
/* Reject down interfaces */
1220
if(not (ifr.ifr_flags & IFF_UP)){
1221
if(debug){
1222
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1223
if_entry->d_name);
1224
}
1225
return 0;
1226
}
1227
1228
/* Reject non-running interfaces */
1229
if(not (ifr.ifr_flags & IFF_RUNNING)){
1230
if(debug){
1231
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1232
if_entry->d_name);
1233
}
1234
return 0;
1235
}
1236
1237
if(not good_flags(if_entry->d_name, &ifr)){
1238
return 0;
1239
}
1240
return 1;
1241
}
1242
1766
1243
int notdotentries(const struct dirent *direntry){
1767
1244
/* Skip "." and ".." */
1768
1245
if(direntry->d_name[0] == '.'
1775
1252
}
1776
1253
1777
1254
/* Is this directory entry a runnable program? */
1778
__attribute__((nonnull, warn_unused_result))
1779
1255
int runnable_hook(const struct dirent *direntry){
1780
1256
int ret;
1781
1257
size_t sret;
1789
1265
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1790
1266
"abcdefghijklmnopqrstuvwxyz"
1791
1267
"0123456789"
1792
"_.-");
1268
"_-");
1793
1269
if((direntry->d_name)[sret] != '\0'){
1794
1270
/* Contains non-allowed characters */
1795
1271
if(debug){
1799
1275
return 0;
1800
1276
}
1801
1277
1802
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1278
char *fullname = NULL;
1279
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1280
if(ret < 0){
1281
perror_plus("asprintf");
1282
return 0;
1283
}
1284
1285
ret = stat(fullname, &st);
1803
1286
if(ret == -1){
1804
1287
if(debug){
1805
1288
perror_plus("Could not stat hook");
1829
1312
return 1;
1830
1313
}
1831
1314
1832
__attribute__((nonnull, warn_unused_result))
1833
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1834
mandos_context *mc){
1315
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1835
1316
int ret;
1836
1317
struct timespec now;
1837
1318
struct timespec waited_time;
1838
1319
intmax_t block_time;
1839
1320
1840
1321
while(true){
1841
if(mc->current_server == NULL){
1842
if(debug){
1322
if(mc.current_server == NULL){
1323
if (debug){
1843
1324
fprintf_plus(stderr, "Wait until first server is found."
1844
1325
" No timeout!\n");
1845
1326
}
1846
1327
ret = avahi_simple_poll_iterate(s, -1);
1847
1328
} else {
1848
if(debug){
1329
if (debug){
1849
1330
fprintf_plus(stderr, "Check current_server if we should run"
1850
1331
" it, or wait\n");
1851
1332
}
1858
1339
/* Calculating in ms how long time between now and server
1859
1340
who we visted longest time ago. Now - last seen. */
1860
1341
waited_time.tv_sec = (now.tv_sec
1861
- mc->current_server->last_seen.tv_sec);
1342
- mc.current_server->last_seen.tv_sec);
1862
1343
waited_time.tv_nsec = (now.tv_nsec
1863
- mc->current_server->last_seen.tv_nsec);
1344
- mc.current_server->last_seen.tv_nsec);
1864
1345
/* total time is 10s/10,000ms.
1865
1346
Converting to s from ms by dividing by 1,000,
1866
1347
and ns to ms by dividing by 1,000,000. */
1868
1349
- ((intmax_t)waited_time.tv_sec * 1000))
1869
1350
- ((intmax_t)waited_time.tv_nsec / 1000000));
1870
1351
1871
if(debug){
1352
if (debug){
1872
1353
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1873
1354
block_time);
1874
1355
}
1875
1356
1876
1357
if(block_time <= 0){
1877
ret = start_mandos_communication(mc->current_server->ip,
1878
mc->current_server->port,
1879
mc->current_server->if_index,
1880
mc->current_server->af, mc);
1358
ret = start_mandos_communication(mc.current_server->ip,
1359
mc.current_server->port,
1360
mc.current_server->if_index,
1361
mc.current_server->af);
1881
1362
if(ret == 0){
1882
avahi_simple_poll_quit(s);
1363
avahi_simple_poll_quit(mc.simple_poll);
1883
1364
return 0;
1884
1365
}
1885
1366
ret = clock_gettime(CLOCK_MONOTONIC,
1886
&mc->current_server->last_seen);
1367
&mc.current_server->last_seen);
1887
1368
if(ret == -1){
1888
1369
perror_plus("clock_gettime");
1889
1370
return -1;
1890
1371
}
1891
mc->current_server = mc->current_server->next;
1372
mc.current_server = mc.current_server->next;
1892
1373
block_time = 0; /* Call avahi to find new Mandos
1893
1374
servers, but don't block */
1894
1375
}
1896
1377
ret = avahi_simple_poll_iterate(s, (int)block_time);
1897
1378
}
1898
1379
if(ret != 0){
1899
if(ret > 0 or errno != EINTR){
1380
if (ret > 0 or errno != EINTR){
1900
1381
return (ret != 1) ? ret : 0;
1901
1382
}
1902
1383
}
1903
1384
}
1904
1385
}
1905
1386
1906
__attribute__((nonnull))
1907
void run_network_hooks(const char *mode, const char *interface,
1387
bool run_network_hooks(const char *mode, const char *interface,
1908
1388
const float delay){
1909
struct dirent **direntries = NULL;
1910
if(hookdir_fd == -1){
1911
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1912
| O_CLOEXEC);
1913
if(hookdir_fd == -1){
1914
if(errno == ENOENT){
1915
if(debug){
1916
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1917
" found\n", hookdir);
1918
}
1919
} else {
1920
perror_plus("open");
1921
}
1922
return;
1923
}
1924
}
1925
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1926
runnable_hook, alphasort);
1389
struct dirent **direntries;
1390
struct dirent *direntry;
1391
int ret;
1392
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1393
alphasort);
1927
1394
if(numhooks == -1){
1928
1395
perror_plus("scandir");
1929
return;
1930
}
1931
struct dirent *direntry;
1932
int ret;
1933
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1934
if(devnull == -1){
1935
perror_plus("open(\"/dev/null\", O_RDONLY)");
1936
return;
1937
}
1938
for(int i = 0; i < numhooks; i++){
1939
direntry = direntries[i];
1940
if(debug){
1941
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1942
direntry->d_name);
1943
}
1944
pid_t hook_pid = fork();
1945
if(hook_pid == 0){
1946
/* Child */
1947
/* Raise privileges */
1948
errno = raise_privileges_permanently();
1949
if(errno != 0){
1950
perror_plus("Failed to raise privileges");
1951
_exit(EX_NOPERM);
1952
}
1953
/* Set group */
1954
errno = 0;
1955
ret = setgid(0);
1956
if(ret == -1){
1957
perror_plus("setgid");
1958
_exit(EX_NOPERM);
1959
}
1960
/* Reset supplementary groups */
1961
errno = 0;
1962
ret = setgroups(0, NULL);
1963
if(ret == -1){
1964
perror_plus("setgroups");
1965
_exit(EX_NOPERM);
1966
}
1967
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1968
if(ret == -1){
1969
perror_plus("setenv");
1970
_exit(EX_OSERR);
1971
}
1972
ret = setenv("DEVICE", interface, 1);
1973
if(ret == -1){
1974
perror_plus("setenv");
1975
_exit(EX_OSERR);
1976
}
1977
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1978
if(ret == -1){
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
ret = setenv("MODE", mode, 1);
1983
if(ret == -1){
1984
perror_plus("setenv");
1985
_exit(EX_OSERR);
1986
}
1987
char *delaystring;
1988
ret = asprintf(&delaystring, "%f", (double)delay);
1989
if(ret == -1){
1396
} else {
1397
int devnull = open("/dev/null", O_RDONLY);
1398
for(int i = 0; i < numhooks; i++){
1399
direntry = direntries[i];
1400
char *fullname = NULL;
1401
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1402
if(ret < 0){
1990
1403
perror_plus("asprintf");
1991
_exit(EX_OSERR);
1992
}
1993
ret = setenv("DELAY", delaystring, 1);
1994
if(ret == -1){
1404
continue;
1405
}
1406
if(debug){
1407
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1408
direntry->d_name);
1409
}
1410
pid_t hook_pid = fork();
1411
if(hook_pid == 0){
1412
/* Child */
1413
/* Raise privileges */
1414
errno = 0;
1415
ret = seteuid(0);
1416
if(ret == -1){
1417
perror_plus("seteuid");
1418
}
1419
/* Raise privileges even more */
1420
errno = 0;
1421
ret = setuid(0);
1422
if(ret == -1){
1423
perror_plus("setuid");
1424
}
1425
/* Set group */
1426
errno = 0;
1427
ret = setgid(0);
1428
if(ret == -1){
1429
perror_plus("setgid");
1430
}
1431
/* Reset supplementary groups */
1432
errno = 0;
1433
ret = setgroups(0, NULL);
1434
if(ret == -1){
1435
perror_plus("setgroups");
1436
}
1437
dup2(devnull, STDIN_FILENO);
1438
close(devnull);
1439
dup2(STDERR_FILENO, STDOUT_FILENO);
1440
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1441
if(ret == -1){
1442
perror_plus("setenv");
1443
_exit(EX_OSERR);
1444
}
1445
ret = setenv("DEVICE", interface, 1);
1446
if(ret == -1){
1447
perror_plus("setenv");
1448
_exit(EX_OSERR);
1449
}
1450
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1451
if(ret == -1){
1452
perror_plus("setenv");
1453
_exit(EX_OSERR);
1454
}
1455
ret = setenv("MODE", mode, 1);
1456
if(ret == -1){
1457
perror_plus("setenv");
1458
_exit(EX_OSERR);
1459
}
1460
char *delaystring;
1461
ret = asprintf(&delaystring, "%f", delay);
1462
if(ret == -1){
1463
perror_plus("asprintf");
1464
_exit(EX_OSERR);
1465
}
1466
ret = setenv("DELAY", delaystring, 1);
1467
if(ret == -1){
1468
free(delaystring);
1469
perror_plus("setenv");
1470
_exit(EX_OSERR);
1471
}
1995
1472
free(delaystring);
1996
perror_plus("setenv");
1997
_exit(EX_OSERR);
1998
}
1999
free(delaystring);
2000
if(connect_to != NULL){
2001
ret = setenv("CONNECT", connect_to, 1);
2002
if(ret == -1){
2003
perror_plus("setenv");
2004
_exit(EX_OSERR);
2005
}
2006
}
2007
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2008
direntry->d_name,
2009
O_RDONLY));
2010
if(hook_fd == -1){
2011
perror_plus("openat");
2012
_exit(EXIT_FAILURE);
2013
}
2014
if(close(hookdir_fd) == -1){
2015
perror_plus("close");
2016
_exit(EXIT_FAILURE);
2017
}
2018
ret = dup2(devnull, STDIN_FILENO);
2019
if(ret == -1){
2020
perror_plus("dup2(devnull, STDIN_FILENO)");
2021
_exit(EX_OSERR);
2022
}
2023
ret = close(devnull);
2024
if(ret == -1){
2025
perror_plus("close");
2026
_exit(EX_OSERR);
2027
}
2028
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2029
if(ret == -1){
2030
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2031
_exit(EX_OSERR);
2032
}
2033
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2034
environ) == -1){
2035
perror_plus("fexecve");
2036
_exit(EXIT_FAILURE);
2037
}
2038
} else {
2039
if(hook_pid == -1){
2040
perror_plus("fork");
2041
free(direntry);
2042
continue;
2043
}
2044
int status;
2045
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2046
perror_plus("waitpid");
2047
free(direntry);
2048
continue;
2049
}
2050
if(WIFEXITED(status)){
2051
if(WEXITSTATUS(status) != 0){
2052
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2053
" with status %d\n", direntry->d_name,
2054
WEXITSTATUS(status));
2055
free(direntry);
2056
continue;
2057
}
2058
} else if(WIFSIGNALED(status)){
2059
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2060
" signal %d\n", direntry->d_name,
2061
WTERMSIG(status));
2062
free(direntry);
2063
continue;
2064
} else {
2065
fprintf_plus(stderr, "Warning: network hook \"%s\""
2066
" crashed\n", direntry->d_name);
2067
free(direntry);
2068
continue;
2069
}
2070
}
2071
if(debug){
2072
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2073
direntry->d_name);
2074
}
2075
free(direntry);
2076
}
2077
free(direntries);
2078
if(close(hookdir_fd) == -1){
2079
perror_plus("close");
2080
} else {
2081
hookdir_fd = -1;
2082
}
2083
close(devnull);
2084
}
2085
2086
__attribute__((nonnull, warn_unused_result))
2087
int bring_up_interface(const char *const interface,
2088
const float delay){
2089
int old_errno = errno;
2090
int ret;
2091
struct ifreq network;
2092
unsigned int if_index = if_nametoindex(interface);
2093
if(if_index == 0){
2094
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2095
errno = old_errno;
2096
return ENXIO;
2097
}
2098
2099
if(quit_now){
2100
errno = old_errno;
2101
return EINTR;
2102
}
2103
2104
if(not interface_is_up(interface)){
2105
int ret_errno = 0;
2106
int ioctl_errno = 0;
2107
if(not get_flags(interface, &network)){
2108
ret_errno = errno;
2109
fprintf_plus(stderr, "Failed to get flags for interface "
2110
"\"%s\"\n", interface);
2111
errno = old_errno;
2112
return ret_errno;
2113
}
2114
network.ifr_flags |= IFF_UP; /* set flag */
2115
2116
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2117
if(sd == -1){
2118
ret_errno = errno;
2119
perror_plus("socket");
2120
errno = old_errno;
2121
return ret_errno;
2122
}
2123
2124
if(quit_now){
2125
ret = close(sd);
2126
if(ret == -1){
2127
perror_plus("close");
2128
}
2129
errno = old_errno;
2130
return EINTR;
2131
}
2132
2133
if(debug){
2134
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2135
interface);
2136
}
2137
2138
/* Raise privileges */
2139
ret_errno = raise_privileges();
2140
if(ret_errno != 0){
2141
errno = ret_errno;
2142
perror_plus("Failed to raise privileges");
2143
}
2144
2145
#ifdef __linux__
2146
int ret_linux;
2147
bool restore_loglevel = false;
2148
if(ret_errno == 0){
2149
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2150
messages about the network interface to mess up the prompt */
2151
ret_linux = klogctl(8, NULL, 5);
2152
if(ret_linux == -1){
2153
perror_plus("klogctl");
2154
} else {
2155
restore_loglevel = true;
2156
}
2157
}
2158
#endif /* __linux__ */
2159
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2160
ioctl_errno = errno;
2161
#ifdef __linux__
2162
if(restore_loglevel){
2163
ret_linux = klogctl(7, NULL, 0);
2164
if(ret_linux == -1){
2165
perror_plus("klogctl");
2166
}
2167
}
2168
#endif /* __linux__ */
2169
2170
/* If raise_privileges() succeeded above */
2171
if(ret_errno == 0){
2172
/* Lower privileges */
2173
ret_errno = lower_privileges();
2174
if(ret_errno != 0){
2175
errno = ret_errno;
2176
perror_plus("Failed to lower privileges");
2177
}
2178
}
2179
2180
/* Close the socket */
2181
ret = close(sd);
2182
if(ret == -1){
2183
perror_plus("close");
2184
}
2185
2186
if(ret_setflags == -1){
2187
errno = ioctl_errno;
2188
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2189
errno = old_errno;
2190
return ioctl_errno;
2191
}
2192
} else if(debug){
2193
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2194
interface);
2195
}
2196
2197
/* Sleep checking until interface is running.
2198
Check every 0.25s, up to total time of delay */
2199
for(int i = 0; i < delay * 4; i++){
2200
if(interface_is_running(interface)){
2201
break;
2202
}
2203
struct timespec sleeptime = { .tv_nsec = 250000000 };
2204
ret = nanosleep(&sleeptime, NULL);
2205
if(ret == -1 and errno != EINTR){
2206
perror_plus("nanosleep");
2207
}
2208
}
2209
2210
errno = old_errno;
2211
return 0;
2212
}
2213
2214
__attribute__((nonnull, warn_unused_result))
2215
int take_down_interface(const char *const interface){
2216
int old_errno = errno;
2217
struct ifreq network;
2218
unsigned int if_index = if_nametoindex(interface);
2219
if(if_index == 0){
2220
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2221
errno = old_errno;
2222
return ENXIO;
2223
}
2224
if(interface_is_up(interface)){
2225
int ret_errno = 0;
2226
int ioctl_errno = 0;
2227
if(not get_flags(interface, &network) and debug){
2228
ret_errno = errno;
2229
fprintf_plus(stderr, "Failed to get flags for interface "
2230
"\"%s\"\n", interface);
2231
errno = old_errno;
2232
return ret_errno;
2233
}
2234
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2235
2236
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2237
if(sd == -1){
2238
ret_errno = errno;
2239
perror_plus("socket");
2240
errno = old_errno;
2241
return ret_errno;
2242
}
2243
2244
if(debug){
2245
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2246
interface);
2247
}
2248
2249
/* Raise privileges */
2250
ret_errno = raise_privileges();
2251
if(ret_errno != 0){
2252
errno = ret_errno;
2253
perror_plus("Failed to raise privileges");
2254
}
2255
2256
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2257
ioctl_errno = errno;
2258
2259
/* If raise_privileges() succeeded above */
2260
if(ret_errno == 0){
2261
/* Lower privileges */
2262
ret_errno = lower_privileges();
2263
if(ret_errno != 0){
2264
errno = ret_errno;
2265
perror_plus("Failed to lower privileges");
2266
}
2267
}
2268
2269
/* Close the socket */
2270
int ret = close(sd);
2271
if(ret == -1){
2272
perror_plus("close");
2273
}
2274
2275
if(ret_setflags == -1){
2276
errno = ioctl_errno;
2277
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2278
errno = old_errno;
2279
return ioctl_errno;
2280
}
2281
} else if(debug){
2282
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2283
interface);
2284
}
2285
2286
errno = old_errno;
2287
return 0;
1473
ret = execl(fullname, direntry->d_name, mode, NULL);
1474
perror_plus("execl");
1475
} else {
1476
int status;
1477
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1478
perror_plus("waitpid");
1479
free(fullname);
1480
continue;
1481
}
1482
if(WIFEXITED(status)){
1483
if(WEXITSTATUS(status) != 0){
1484
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1485
" with status %d\n", direntry->d_name,
1486
WEXITSTATUS(status));
1487
free(fullname);
1488
continue;
1489
}
1490
} else if(WIFSIGNALED(status)){
1491
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1492
" signal %d\n", direntry->d_name,
1493
WTERMSIG(status));
1494
free(fullname);
1495
continue;
1496
} else {
1497
fprintf_plus(stderr, "Warning: network hook \"%s\""
1498
" crashed\n", direntry->d_name);
1499
free(fullname);
1500
continue;
1501
}
1502
}
1503
free(fullname);
1504
if(debug){
1505
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1506
direntry->d_name);
1507
}
1508
}
1509
close(devnull);
1510
}
1511
return true;
2288
1512
}
2289
1513
2290
1514
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
1515
AvahiSServiceBrowser *sb = NULL;
2297
error_t ret_errno;
1516
int error;
2298
1517
int ret;
2299
1518
intmax_t tmpmax;
2300
1519
char *tmp;
2301
1520
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;
1521
const char *interface = "";
1522
struct ifreq network;
1523
int sd = -1;
1524
bool take_down_interface = false;
1525
uid_t uid;
1526
gid_t gid;
1527
char tempdir[] = "/tmp/mandosXXXXXX";
1528
bool tempdir_created = false;
2307
1529
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2308
1530
const char *seckey = PATHDIR "/" SECKEY;
2309
1531
const char *pubkey = PATHDIR "/" PUBKEY;
2310
const char *dh_params_file = NULL;
2311
char *interfaces_hooks = NULL;
2312
1532
2313
1533
bool gnutls_initialized = false;
2314
1534
bool gpgme_initialized = false;
2366
1586
.doc = "Bit length of the prime number used in the"
2367
1587
" Diffie-Hellman key exchange",
2368
1588
.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
1589
{ .name = "priority", .key = 130,
2375
1590
.arg = "STRING",
2376
1591
.doc = "GnuTLS priority string for the TLS handshake",
2381
1596
.group = 2 },
2382
1597
{ .name = "retry", .key = 132,
2383
1598
.arg = "SECONDS",
2384
.doc = "Retry interval used when denied by the Mandos server",
1599
.doc = "Retry interval used when denied by the mandos server",
2385
1600
.group = 2 },
2386
1601
{ .name = "network-hook-dir", .key = 133,
2387
1602
.arg = "DIR",
2410
1625
connect_to = arg;
2411
1626
break;
2412
1627
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
}
1628
interface = arg;
2418
1629
break;
2419
1630
case 's': /* --seckey */
2420
1631
seckey = arg;
2431
1642
}
2432
1643
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2433
1644
break;
2434
case 134: /* --dh-params */
2435
dh_params_file = arg;
2436
break;
2437
1645
case 130: /* --priority */
2438
1646
mc.priority = arg;
2439
1647
break;
2479
1687
.args_doc = "",
2480
1688
.doc = "Mandos client -- Get and decrypt"
2481
1689
" passwords from a Mandos server" };
2482
ret_errno = argp_parse(&argp, argc, argv,
2483
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2484
switch(ret_errno){
1690
ret = argp_parse(&argp, argc, argv,
1691
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1692
switch(ret){
2485
1693
case 0:
2486
1694
break;
2487
1695
case ENOMEM:
2488
1696
default:
2489
errno = ret_errno;
1697
errno = ret;
2490
1698
perror_plus("argp_parse");
2491
1699
exitcode = EX_OSERR;
2492
1700
goto end;
2495
1703
goto end;
2496
1704
}
2497
1705
}
2498
1706
2499
1707
{
2500
1708
/* Work around Debian bug #633582:
2501
<https://bugs.debian.org/633582> */
1709
<http://bugs.debian.org/633582> */
2502
1710
2503
/* Re-raise privileges */
2504
ret = raise_privileges();
2505
if(ret != 0){
2506
errno = ret;
2507
perror_plus("Failed to raise privileges");
1711
/* Re-raise priviliges */
1712
errno = 0;
1713
ret = seteuid(0);
1714
if(ret == -1){
1715
perror_plus("seteuid");
2508
1716
} else {
2509
1717
struct stat st;
2510
1718
2525
1733
}
2526
1734
}
2527
1735
}
2528
close(seckey_fd);
1736
TEMP_FAILURE_RETRY(close(seckey_fd));
2529
1737
}
2530
1738
}
2531
1739
2532
1740
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2533
1741
int pubkey_fd = open(pubkey, O_RDONLY);
2534
1742
if(pubkey_fd == -1){
2546
1754
}
2547
1755
}
2548
1756
}
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
1757
TEMP_FAILURE_RETRY(close(pubkey_fd));
1758
}
1759
}
1760
2575
1761
/* Lower privileges */
2576
ret = lower_privileges();
2577
if(ret != 0){
2578
errno = ret;
2579
perror_plus("Failed to lower privileges");
2580
}
2581
}
2582
}
2583
2584
/* Remove invalid interface names (except "none") */
2585
{
2586
char *interface = NULL;
2587
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2588
interface))){
2589
if(strcmp(interface, "none") != 0
2590
and if_nametoindex(interface) == 0){
2591
if(interface[0] != '\0'){
2592
fprintf_plus(stderr, "Not using nonexisting interface"
2593
" \"%s\"\n", interface);
2594
}
2595
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2596
interface = NULL;
1762
errno = 0;
1763
ret = seteuid(uid);
1764
if(ret == -1){
1765
perror_plus("seteuid");
2597
1766
}
2598
1767
}
2599
1768
}
2600
1769
2601
1770
/* 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);
1771
if(not run_network_hooks("start", interface, delay)){
1772
goto end;
2614
1773
}
2615
1774
2616
1775
if(not debug){
2617
1776
avahi_set_log_function(empty_log);
2618
1777
}
2619
1778
1779
if(interface[0] == '\0'){
1780
struct dirent **direntries;
1781
/* First look for interfaces that are up */
1782
ret = scandir(sys_class_net, &direntries, up_interface,
1783
alphasort);
1784
if(ret == 0){
1785
/* No up interfaces, look for any good interfaces */
1786
free(direntries);
1787
ret = scandir(sys_class_net, &direntries, good_interface,
1788
alphasort);
1789
}
1790
if(ret >= 1){
1791
/* Pick the first interface returned */
1792
interface = strdup(direntries[0]->d_name);
1793
if(debug){
1794
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1795
}
1796
if(interface == NULL){
1797
perror_plus("malloc");
1798
free(direntries);
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
free(direntries);
1803
} else {
1804
free(direntries);
1805
fprintf_plus(stderr, "Could not find a network interface\n");
1806
exitcode = EXIT_FAILURE;
1807
goto end;
1808
}
1809
}
1810
2620
1811
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2621
1812
from the signal handler */
2622
1813
/* Initialize the pseudo-RNG for Avahi */
2623
1814
srand((unsigned int) time(NULL));
2624
simple_poll = avahi_simple_poll_new();
2625
if(simple_poll == NULL){
1815
mc.simple_poll = avahi_simple_poll_new();
1816
if(mc.simple_poll == NULL){
2626
1817
fprintf_plus(stderr,
2627
1818
"Avahi: Failed to create simple poll object.\n");
2628
1819
exitcode = EX_UNAVAILABLE;
2692
1883
}
2693
1884
}
2694
1885
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;
1886
/* If the interface is down, bring it up */
1887
if(strcmp(interface, "none") != 0){
1888
if_index = (AvahiIfIndex) if_nametoindex(interface);
1889
if(if_index == 0){
1890
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1891
exitcode = EX_UNAVAILABLE;
1892
goto end;
1893
}
1894
1895
if(quit_now){
1896
goto end;
1897
}
1898
1899
/* Re-raise priviliges */
1900
errno = 0;
1901
ret = seteuid(0);
1902
if(ret == -1){
1903
perror_plus("seteuid");
1904
}
1905
1906
#ifdef __linux__
1907
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1908
messages about the network interface to mess up the prompt */
1909
ret = klogctl(8, NULL, 5);
1910
bool restore_loglevel = true;
1911
if(ret == -1){
1912
restore_loglevel = false;
1913
perror_plus("klogctl");
1914
}
1915
#endif /* __linux__ */
1916
1917
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1918
if(sd < 0){
1919
perror_plus("socket");
1920
exitcode = EX_OSERR;
1921
#ifdef __linux__
1922
if(restore_loglevel){
1923
ret = klogctl(7, NULL, 0);
1924
if(ret == -1){
1925
perror_plus("klogctl");
1926
}
1927
}
1928
#endif /* __linux__ */
1929
/* Lower privileges */
1930
errno = 0;
1931
ret = seteuid(uid);
1932
if(ret == -1){
1933
perror_plus("seteuid");
1934
}
1935
goto end;
1936
}
1937
strcpy(network.ifr_name, interface);
1938
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1939
if(ret == -1){
1940
perror_plus("ioctl SIOCGIFFLAGS");
1941
#ifdef __linux__
1942
if(restore_loglevel){
1943
ret = klogctl(7, NULL, 0);
1944
if(ret == -1){
1945
perror_plus("klogctl");
1946
}
1947
}
1948
#endif /* __linux__ */
1949
exitcode = EX_OSERR;
1950
/* Lower privileges */
1951
errno = 0;
1952
ret = seteuid(uid);
1953
if(ret == -1){
1954
perror_plus("seteuid");
1955
}
1956
goto end;
1957
}
1958
if((network.ifr_flags & IFF_UP) == 0){
1959
network.ifr_flags |= IFF_UP;
1960
take_down_interface = true;
1961
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1962
if(ret == -1){
1963
take_down_interface = false;
1964
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1965
exitcode = EX_OSERR;
1966
#ifdef __linux__
1967
if(restore_loglevel){
1968
ret = klogctl(7, NULL, 0);
1969
if(ret == -1){
1970
perror_plus("klogctl");
2746
1971
}
2747
1972
}
1973
#endif /* __linux__ */
1974
/* Lower privileges */
1975
errno = 0;
1976
ret = seteuid(uid);
1977
if(ret == -1){
1978
perror_plus("seteuid");
1979
}
1980
goto end;
1981
}
1982
}
1983
/* Sleep checking until interface is running.
1984
Check every 0.25s, up to total time of delay */
1985
for(int i=0; i < delay * 4; i++){
1986
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1987
if(ret == -1){
1988
perror_plus("ioctl SIOCGIFFLAGS");
1989
} else if(network.ifr_flags & IFF_RUNNING){
2748
1990
break;
2749
1991
}
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);
1992
struct timespec sleeptime = { .tv_nsec = 250000000 };
1993
ret = nanosleep(&sleeptime, NULL);
1994
if(ret == -1 and errno != EINTR){
1995
perror_plus("nanosleep");
1996
}
1997
}
1998
if(not take_down_interface){
1999
/* We won't need the socket anymore */
2000
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2001
if(ret == -1){
2002
perror_plus("close");
2003
}
2004
}
2005
#ifdef __linux__
2006
if(restore_loglevel){
2007
/* Restores kernel loglevel to default */
2008
ret = klogctl(7, NULL, 0);
2009
if(ret == -1){
2010
perror_plus("klogctl");
2011
}
2012
}
2013
#endif /* __linux__ */
2014
/* Lower privileges */
2015
errno = 0;
2016
/* Lower privileges */
2017
ret = seteuid(uid);
2018
if(ret == -1){
2019
perror_plus("seteuid");
2020
}
2778
2021
}
2779
2022
2780
2023
if(quit_now){
2781
2024
goto end;
2782
2025
}
2783
2026
2784
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2027
ret = init_gnutls_global(pubkey, seckey);
2785
2028
if(ret == -1){
2786
2029
fprintf_plus(stderr, "init_gnutls_global failed\n");
2787
2030
exitcode = EX_UNAVAILABLE;
2794
2037
goto end;
2795
2038
}
2796
2039
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){
2040
if(mkdtemp(tempdir) == NULL){
2807
2041
perror_plus("mkdtemp");
2808
2042
goto end;
2809
2043
}
2044
tempdir_created = true;
2810
2045
2811
2046
if(quit_now){
2812
2047
goto end;
2813
2048
}
2814
2049
2815
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2050
if(not init_gpgme(pubkey, seckey, tempdir)){
2816
2051
fprintf_plus(stderr, "init_gpgme failed\n");
2817
2052
exitcode = EX_UNAVAILABLE;
2818
2053
goto end;
2828
2063
/* Connect directly, do not use Zeroconf */
2829
2064
/* (Mainly meant for debugging) */
2830
2065
char *address = strrchr(connect_to, ':');
2831
2832
2066
if(address == NULL){
2833
2067
fprintf_plus(stderr, "No colon in address\n");
2834
2068
exitcode = EX_USAGE;
2839
2073
goto end;
2840
2074
}
2841
2075
2842
in_port_t port;
2076
uint16_t port;
2843
2077
errno = 0;
2844
2078
tmpmax = strtoimax(address+1, &tmp, 10);
2845
2079
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2846
or tmpmax != (in_port_t)tmpmax){
2080
or tmpmax != (uint16_t)tmpmax){
2847
2081
fprintf_plus(stderr, "Bad port number\n");
2848
2082
exitcode = EX_USAGE;
2849
2083
goto end;
2850
2084
}
2851
2085
2852
2086
if(quit_now){
2853
2087
goto end;
2854
2088
}
2855
2089
2856
port = (in_port_t)tmpmax;
2090
port = (uint16_t)tmpmax;
2857
2091
*address = '\0';
2858
2092
/* Colon in address indicates IPv6 */
2859
2093
int af;
2875
2109
}
2876
2110
2877
2111
while(not quit_now){
2878
ret = start_mandos_communication(address, port, if_index, af,
2879
&mc);
2112
ret = start_mandos_communication(address, port, if_index, af);
2880
2113
if(quit_now or ret == 0){
2881
2114
break;
2882
2115
}
2884
2117
fprintf_plus(stderr, "Retrying in %d seconds\n",
2885
2118
(int)retry_interval);
2886
2119
}
2887
sleep((unsigned int)retry_interval);
2120
sleep((int)retry_interval);
2888
2121
}
2889
2122
2890
if(not quit_now){
2123
if (not quit_now){
2891
2124
exitcode = EXIT_SUCCESS;
2892
2125
}
2893
2126
2908
2141
config.publish_domain = 0;
2909
2142
2910
2143
/* Allocate a new server */
2911
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2912
&config, NULL, NULL, &ret);
2144
mc.server = avahi_server_new(avahi_simple_poll_get
2145
(mc.simple_poll), &config, NULL,
2146
NULL, &error);
2913
2147
2914
2148
/* Free the Avahi configuration data */
2915
2149
avahi_server_config_free(&config);
2918
2152
/* Check if creating the Avahi server object succeeded */
2919
2153
if(mc.server == NULL){
2920
2154
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2921
avahi_strerror(ret));
2155
avahi_strerror(error));
2922
2156
exitcode = EX_UNAVAILABLE;
2923
2157
goto end;
2924
2158
}
2930
2164
/* Create the Avahi service browser */
2931
2165
sb = avahi_s_service_browser_new(mc.server, if_index,
2932
2166
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2933
NULL, 0, browse_callback,
2934
(void *)&mc);
2167
NULL, 0, browse_callback, NULL);
2935
2168
if(sb == NULL){
2936
2169
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2937
2170
avahi_strerror(avahi_server_errno(mc.server)));
2948
2181
if(debug){
2949
2182
fprintf_plus(stderr, "Starting Avahi loop search\n");
2950
2183
}
2951
2952
ret = avahi_loop_with_timeout(simple_poll,
2953
(int)(retry_interval * 1000), &mc);
2184
2185
ret = avahi_loop_with_timeout(mc.simple_poll,
2186
(int)(retry_interval * 1000));
2954
2187
if(debug){
2955
2188
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2956
2189
(ret == 0) ? "successfully" : "with error");
2959
2192
end:
2960
2193
2961
2194
if(debug){
2962
if(signal_received){
2963
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2964
argv[0], signal_received,
2965
strsignal(signal_received));
2966
} else {
2967
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2968
}
2195
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
2196
}
2970
2197
2971
2198
/* Cleanup things */
2972
free(mc.interfaces);
2973
2974
2199
if(sb != NULL)
2975
2200
avahi_s_service_browser_free(sb);
2976
2201
2977
2202
if(mc.server != NULL)
2978
2203
avahi_server_free(mc.server);
2979
2204
2980
if(simple_poll != NULL)
2981
avahi_simple_poll_free(simple_poll);
2205
if(mc.simple_poll != NULL)
2206
avahi_simple_poll_free(mc.simple_poll);
2982
2207
2983
2208
if(gnutls_initialized){
2984
2209
gnutls_certificate_free_credentials(mc.cred);
2210
gnutls_global_deinit();
2985
2211
gnutls_dh_params_deinit(mc.dh_params);
2986
2212
}
2987
2213
2995
2221
mc.current_server->prev->next = NULL;
2996
2222
while(mc.current_server != NULL){
2997
2223
server *next = mc.current_server->next;
2998
#ifdef __GNUC__
2999
#pragma GCC diagnostic push
3000
#pragma GCC diagnostic ignored "-Wcast-qual"
3001
#endif
3002
free((char *)(mc.current_server->ip));
3003
#ifdef __GNUC__
3004
#pragma GCC diagnostic pop
3005
#endif
3006
2224
free(mc.current_server);
3007
2225
mc.current_server = next;
3008
2226
}
3009
2227
}
3010
2228
3011
/* Re-raise privileges */
2229
/* Run network hooks */
2230
run_network_hooks("stop", interface, delay);
2231
2232
/* Re-raise priviliges */
3012
2233
{
3013
ret = raise_privileges();
3014
if(ret != 0){
3015
errno = ret;
3016
perror_plus("Failed to raise privileges");
3017
} else {
3018
3019
/* Run network hooks */
3020
run_network_hooks("stop", interfaces_hooks != NULL ?
3021
interfaces_hooks : "", delay);
3022
3023
/* Take down the network interfaces which were brought up */
3024
{
3025
char *interface = NULL;
3026
while((interface = argz_next(interfaces_to_take_down,
3027
interfaces_to_take_down_size,
3028
interface))){
3029
ret = take_down_interface(interface);
3030
if(ret != 0){
3031
errno = ret;
3032
perror_plus("Failed to take down interface");
3033
}
3034
}
3035
if(debug and (interfaces_to_take_down == NULL)){
3036
fprintf_plus(stderr, "No interfaces needed to be taken"
3037
" down\n");
3038
}
3039
}
2234
errno = 0;
2235
ret = seteuid(0);
2236
if(ret == -1){
2237
perror_plus("seteuid");
3040
2238
}
3041
2239
3042
ret = lower_privileges_permanently();
3043
if(ret != 0){
3044
errno = ret;
3045
perror_plus("Failed to lower privileges permanently");
2240
/* Take down the network interface */
2241
if(take_down_interface and geteuid() == 0){
2242
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2243
if(ret == -1){
2244
perror_plus("ioctl SIOCGIFFLAGS");
2245
} else if(network.ifr_flags & IFF_UP){
2246
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2247
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2248
if(ret == -1){
2249
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2250
}
2251
}
2252
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2253
if(ret == -1){
2254
perror_plus("close");
2255
}
3046
2256
}
3047
2257
}
3048
3049
free(interfaces_to_take_down);
3050
free(interfaces_hooks);
3051
3052
void clean_dir_at(int base, const char * const dirname,
3053
uintmax_t level){
2258
/* Lower privileges permanently */
2259
errno = 0;
2260
ret = setuid(uid);
2261
if(ret == -1){
2262
perror_plus("setuid");
2263
}
2264
2265
/* Removes the GPGME temp directory and all files inside */
2266
if(tempdir_created){
3054
2267
struct dirent **direntries = NULL;
3055
int dret;
3056
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3057
O_RDONLY
3058
| O_NOFOLLOW
3059
| O_DIRECTORY
3060
| O_PATH));
3061
if(dir_fd == -1){
3062
perror_plus("open");
3063
}
3064
int numentries = scandirat(dir_fd, ".", &direntries,
3065
notdotentries, alphasort);
3066
if(numentries >= 0){
2268
struct dirent *direntry = NULL;
2269
int numentries = scandir(tempdir, &direntries, notdotentries,
2270
alphasort);
2271
if (numentries > 0){
3067
2272
for(int i = 0; i < numentries; i++){
3068
if(debug){
3069
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3070
dirname, direntries[i]->d_name);
3071
}
3072
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3073
if(dret == -1){
3074
if(errno == EISDIR){
3075
dret = unlinkat(dir_fd, direntries[i]->d_name,
3076
AT_REMOVEDIR);
3077
}
3078
if((dret == -1) and (errno == ENOTEMPTY)
3079
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3080
== 0) and (level == 0)){
3081
/* Recurse only in this special case */
3082
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3083
dret = 0;
3084
}
3085
if(dret == -1){
3086
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3087
direntries[i]->d_name, strerror(errno));
3088
}
3089
}
3090
free(direntries[i]);
3091
}
3092
3093
/* need to clean even if 0 because man page doesn't specify */
3094
free(direntries);
3095
if(numentries == -1){
3096
perror_plus("scandirat");
3097
}
3098
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3099
if(dret == -1 and errno != ENOENT){
3100
perror_plus("rmdir");
3101
}
3102
} else {
3103
perror_plus("scandirat");
3104
}
3105
close(dir_fd);
3106
}
3107
3108
/* Removes the GPGME temp directory and all files inside */
3109
if(tempdir != NULL){
3110
clean_dir_at(-1, tempdir, 0);
2273
direntry = direntries[i];
2274
char *fullname = NULL;
2275
ret = asprintf(&fullname, "%s/%s", tempdir,
2276
direntry->d_name);
2277
if(ret < 0){
2278
perror_plus("asprintf");
2279
continue;
2280
}
2281
ret = remove(fullname);
2282
if(ret == -1){
2283
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2284
strerror(errno));
2285
}
2286
free(fullname);
2287
}
2288
}
2289
2290
/* need to clean even if 0 because man page doesn't specify */
2291
free(direntries);
2292
if (numentries == -1){
2293
perror_plus("scandir");
2294
}
2295
ret = rmdir(tempdir);
2296
if(ret == -1 and errno != ENOENT){
2297
perror_plus("rmdir");
2298
}
3111
2299
}
3112
2300
3113
2301
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0