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- Committer: Teddy Hogeborn
- Date: 2015-07-07 15:49:49 UTC
- Revision ID: teddy@recompile.se-20150707154949-vbuj4pc6wf3o1vgz
mandos.service: Use Type=dbus (implicitly).
mandos.service ([Service]/Type): Removed.
([Service]/BusName): Uncommented; set to
"se.recompile.Mandos".
mandos.service ([Service]/Type): Removed.
([Service]/BusName): Uncommented; set to
"se.recompile.Mandos".
- files added:
- debian/mandos-client.examples
- debian/upstream
- plugin-helpers
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
43
stdout, ferror() */
44
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
78
79
#include <iso646.h> /* not, or, and */
79
80
#include <argp.h> /* struct argp_option, error_t, struct
80
81
argp_state, struct argp,
88
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
90
WEXITSTATUS(), WTERMSIG() */
90
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
91
98
92
99
#ifdef __linux__
93
100
#include <sys/klog.h> /* klogctl() */
135
142
static const char sys_class_net[] = "/sys/class/net";
136
143
char *connect_to = NULL;
137
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
138
148
139
149
/* Doubly linked list that need to be circularly linked when used */
140
150
typedef struct server{
141
151
const char *ip;
142
uint16_t port;
152
in_port_t port;
143
153
AvahiIfIndex if_index;
144
154
int af;
145
155
struct timespec last_seen;
149
159
150
160
/* Used for passing in values through the Avahi callback functions */
151
161
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
162
AvahiServer *server;
154
163
gnutls_certificate_credentials_t cred;
155
164
unsigned int dh_bits;
157
166
const char *priority;
158
167
gpgme_ctx_t ctx;
159
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
160
171
} mandos_context;
161
172
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
167
175
168
176
sig_atomic_t quit_now = 0;
169
177
int signal_received = 0;
177
185
perror(print_text);
178
186
}
179
187
180
__attribute__((format (gnu_printf, 2, 3)))
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
181
189
int fprintf_plus(FILE *stream, const char *format, ...){
182
190
va_list ap;
183
191
va_start (ap, format);
184
192
185
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
194
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
196
}
189
197
190
198
/*
192
200
* bytes. "buffer_capacity" is how much is currently allocated,
193
201
* "buffer_length" is how much is already used.
194
202
*/
203
__attribute__((nonnull, warn_unused_result))
195
204
size_t incbuffer(char **buffer, size_t buffer_length,
196
205
size_t buffer_capacity){
197
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
198
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
200
213
return 0;
201
214
}
215
*buffer = new_buf;
202
216
buffer_capacity += BUFFER_SIZE;
203
217
}
204
218
return buffer_capacity;
205
219
}
206
220
207
221
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
210
225
int ret;
211
226
server *new_server = malloc(sizeof(server));
212
227
if(new_server == NULL){
219
234
.af = af };
220
235
if(new_server->ip == NULL){
221
236
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
222
252
return false;
223
253
}
224
254
/* Special case of first server */
225
if (mc.current_server == NULL){
255
if(*current_server == NULL){
226
256
new_server->next = new_server;
227
257
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
258
*current_server = new_server;
230
259
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
233
263
new_server->prev->next = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
264
(*current_server)->prev = new_server;
240
265
}
241
266
return true;
242
267
}
244
269
/*
245
270
* Initialize GPGME.
246
271
*/
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
249
277
gpgme_error_t rc;
250
278
gpgme_engine_info_t engine_info;
251
279
252
253
280
/*
254
281
* Helper function to insert pub and seckey to the engine keyring.
255
282
*/
256
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
257
284
int ret;
258
285
int fd;
259
286
gpgme_data_t pgp_data;
271
298
return false;
272
299
}
273
300
274
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
275
302
if(rc != GPG_ERR_NO_ERROR){
276
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
304
gpgme_strsource(rc), gpgme_strerror(rc));
321
348
}
322
349
323
350
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
325
352
if(rc != GPG_ERR_NO_ERROR){
326
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
340
367
* Decrypt OpenPGP data.
341
368
* Returns -1 on error
342
369
*/
370
__attribute__((nonnull, warn_unused_result))
343
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
372
size_t crypto_size,
345
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
346
375
gpgme_data_t dh_crypto, dh_plain;
347
376
gpgme_error_t rc;
348
377
ssize_t ret;
374
403
375
404
/* Decrypt data from the cryptotext data buffer to the plaintext
376
405
data buffer */
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
378
407
if(rc != GPG_ERR_NO_ERROR){
379
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
409
gpgme_strsource(rc), gpgme_strerror(rc));
381
410
plaintext_length = -1;
382
411
if(debug){
383
412
gpgme_decrypt_result_t result;
384
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
385
414
if(result == NULL){
386
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
387
416
} else {
464
493
return plaintext_length;
465
494
}
466
495
467
static const char * safer_gnutls_strerror(int value){
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
470
if(ret == NULL)
471
ret = "(unknown)";
472
return ret;
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
473
507
}
474
508
475
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
476
511
static void debuggnutls(__attribute__((unused)) int level,
477
512
const char* string){
478
513
fprintf_plus(stderr, "GnuTLS: %s", string);
479
514
}
480
515
516
__attribute__((nonnull, warn_unused_result))
481
517
static int init_gnutls_global(const char *pubkeyfilename,
482
const char *seckeyfilename){
518
const char *seckeyfilename,
519
mandos_context *mc){
483
520
int ret;
521
unsigned int uret;
484
522
485
523
if(debug){
486
524
fprintf_plus(stderr, "Initializing GnuTLS\n");
502
540
}
503
541
504
542
/* OpenPGP credentials */
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
506
544
if(ret != GNUTLS_E_SUCCESS){
507
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
546
safer_gnutls_strerror(ret));
518
556
}
519
557
520
558
ret = gnutls_certificate_set_openpgp_key_file
521
(mc.cred, pubkeyfilename, seckeyfilename,
559
(mc->cred, pubkeyfilename, seckeyfilename,
522
560
GNUTLS_OPENPGP_FMT_BASE64);
523
561
if(ret != GNUTLS_E_SUCCESS){
524
562
fprintf_plus(stderr,
530
568
}
531
569
532
570
/* GnuTLS server initialization */
533
ret = gnutls_dh_params_init(&mc.dh_params);
571
ret = gnutls_dh_params_init(&mc->dh_params);
534
572
if(ret != GNUTLS_E_SUCCESS){
535
573
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
574
" initialization: %s\n",
537
575
safer_gnutls_strerror(ret));
538
576
goto globalfail;
539
577
}
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
582
{
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
585
while(true){
586
buffer_capacity = incbuffer((char **)&buffer.data,
587
(size_t)buffer.size,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
590
perror_plus("incbuffer");
591
free(buffer.data);
592
buffer.data = NULL;
593
break;
594
}
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
596
BUFFER_SIZE);
597
/* EOF */
598
if(bytes_read == 0){
599
break;
600
}
601
/* check bytes_read for failure */
602
if(bytes_read < 0){
603
perror_plus("read");
604
free(buffer.data);
605
buffer.data = NULL;
606
break;
607
}
608
buffer.size += (unsigned int)bytes_read;
609
}
610
close(secfile);
611
}
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
615
{
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
621
free(buffer.data);
622
buffer.data = NULL;
623
} else {
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
626
"", 0);
627
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
629
safer_gnutls_strerror(ret));
630
privkey = NULL;
631
}
632
free(buffer.data);
633
buffer.data = NULL;
634
if(privkey != NULL){
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
638
if(debug){
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
642
(sec_param)));
643
}
644
}
645
}
646
}
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
650
if(debug){
651
fprintf_plus(stderr, "Falling back to security parameter"
652
" \"%s\"\n",
653
safe_string(gnutls_sec_param_get_name
654
(sec_param)));
655
}
656
}
657
}
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
659
if(uret != 0){
660
mc->dh_bits = uret;
661
if(debug){
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
664
safe_string(gnutls_sec_param_get_name
665
(sec_param)),
666
mc->dh_bits);
667
}
668
} else {
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
672
safer_gnutls_strerror(ret));
673
goto globalfail;
674
}
675
} else if(debug){
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
677
mc->dh_bits);
678
}
679
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
541
680
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
544
683
goto globalfail;
545
684
}
546
685
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
686
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
548
687
549
688
return 0;
550
689
551
690
globalfail:
552
691
553
gnutls_certificate_free_credentials(mc.cred);
692
gnutls_certificate_free_credentials(mc->cred);
554
693
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
694
gnutls_dh_params_deinit(mc->dh_params);
556
695
return -1;
557
696
}
558
697
559
static int init_gnutls_session(gnutls_session_t *session){
698
__attribute__((nonnull, warn_unused_result))
699
static int init_gnutls_session(gnutls_session_t *session,
700
mandos_context *mc){
560
701
int ret;
561
702
/* GnuTLS session creation */
562
703
do {
574
715
{
575
716
const char *err;
576
717
do {
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
718
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
578
719
if(quit_now){
579
720
gnutls_deinit(*session);
580
721
return -1;
591
732
592
733
do {
593
734
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
mc.cred);
735
mc->cred);
595
736
if(quit_now){
596
737
gnutls_deinit(*session);
597
738
return -1;
607
748
/* ignore client certificate if any. */
608
749
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
609
750
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
611
752
612
753
return 0;
613
754
}
616
757
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
617
758
__attribute__((unused)) const char *txt){}
618
759
760
/* Set effective uid to 0, return errno */
761
__attribute__((warn_unused_result))
762
error_t raise_privileges(void){
763
error_t old_errno = errno;
764
error_t ret_errno = 0;
765
if(seteuid(0) == -1){
766
ret_errno = errno;
767
}
768
errno = old_errno;
769
return ret_errno;
770
}
771
772
/* Set effective and real user ID to 0. Return errno. */
773
__attribute__((warn_unused_result))
774
error_t raise_privileges_permanently(void){
775
error_t old_errno = errno;
776
error_t ret_errno = raise_privileges();
777
if(ret_errno != 0){
778
errno = old_errno;
779
return ret_errno;
780
}
781
if(setuid(0) == -1){
782
ret_errno = errno;
783
}
784
errno = old_errno;
785
return ret_errno;
786
}
787
788
/* Set effective user ID to unprivileged saved user ID */
789
__attribute__((warn_unused_result))
790
error_t lower_privileges(void){
791
error_t old_errno = errno;
792
error_t ret_errno = 0;
793
if(seteuid(uid) == -1){
794
ret_errno = errno;
795
}
796
errno = old_errno;
797
return ret_errno;
798
}
799
800
/* Lower privileges permanently */
801
__attribute__((warn_unused_result))
802
error_t lower_privileges_permanently(void){
803
error_t old_errno = errno;
804
error_t ret_errno = 0;
805
if(setuid(uid) == -1){
806
ret_errno = errno;
807
}
808
errno = old_errno;
809
return ret_errno;
810
}
811
812
/* Helper function to add_local_route() and delete_local_route() */
813
__attribute__((nonnull, warn_unused_result))
814
static bool add_delete_local_route(const bool add,
815
const char *address,
816
AvahiIfIndex if_index){
817
int ret;
818
char helper[] = "mandos-client-iprouteadddel";
819
char add_arg[] = "add";
820
char delete_arg[] = "delete";
821
char debug_flag[] = "--debug";
822
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
823
if(pluginhelperdir == NULL){
824
if(debug){
825
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
826
" variable not set; cannot run helper\n");
827
}
828
return false;
829
}
830
831
char interface[IF_NAMESIZE];
832
if(if_indextoname((unsigned int)if_index, interface) == NULL){
833
perror_plus("if_indextoname");
834
return false;
835
}
836
837
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
838
if(devnull == -1){
839
perror_plus("open(\"/dev/null\", O_RDONLY)");
840
return false;
841
}
842
pid_t pid = fork();
843
if(pid == 0){
844
/* Child */
845
/* Raise privileges */
846
errno = raise_privileges_permanently();
847
if(errno != 0){
848
perror_plus("Failed to raise privileges");
849
/* _exit(EX_NOPERM); */
850
} else {
851
/* Set group */
852
errno = 0;
853
ret = setgid(0);
854
if(ret == -1){
855
perror_plus("setgid");
856
_exit(EX_NOPERM);
857
}
858
/* Reset supplementary groups */
859
errno = 0;
860
ret = setgroups(0, NULL);
861
if(ret == -1){
862
perror_plus("setgroups");
863
_exit(EX_NOPERM);
864
}
865
}
866
ret = dup2(devnull, STDIN_FILENO);
867
if(ret == -1){
868
perror_plus("dup2(devnull, STDIN_FILENO)");
869
_exit(EX_OSERR);
870
}
871
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
872
if(ret == -1){
873
perror_plus("close");
874
_exit(EX_OSERR);
875
}
876
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
877
if(ret == -1){
878
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
879
_exit(EX_OSERR);
880
}
881
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
882
O_RDONLY
883
| O_DIRECTORY
884
| O_PATH
885
| O_CLOEXEC));
886
if(helperdir_fd == -1){
887
perror_plus("open");
888
_exit(EX_UNAVAILABLE);
889
}
890
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
891
helper, O_RDONLY));
892
if(helper_fd == -1){
893
perror_plus("openat");
894
_exit(EX_UNAVAILABLE);
895
}
896
TEMP_FAILURE_RETRY(close(helperdir_fd));
897
#ifdef __GNUC__
898
#pragma GCC diagnostic push
899
#pragma GCC diagnostic ignored "-Wcast-qual"
900
#endif
901
if(fexecve(helper_fd, (char *const [])
902
{ helper, add ? add_arg : delete_arg, (char *)address,
903
interface, debug ? debug_flag : NULL, NULL },
904
environ) == -1){
905
#ifdef __GNUC__
906
#pragma GCC diagnostic pop
907
#endif
908
perror_plus("fexecve");
909
_exit(EXIT_FAILURE);
910
}
911
}
912
if(pid == -1){
913
perror_plus("fork");
914
return false;
915
}
916
int status;
917
pid_t pret = -1;
918
errno = 0;
919
do {
920
pret = waitpid(pid, &status, 0);
921
if(pret == -1 and errno == EINTR and quit_now){
922
int errno_raising = 0;
923
if((errno = raise_privileges()) != 0){
924
errno_raising = errno;
925
perror_plus("Failed to raise privileges in order to"
926
" kill helper program");
927
}
928
if(kill(pid, SIGTERM) == -1){
929
perror_plus("kill");
930
}
931
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
932
perror_plus("Failed to lower privileges after killing"
933
" helper program");
934
}
935
return false;
936
}
937
} while(pret == -1 and errno == EINTR);
938
if(pret == -1){
939
perror_plus("waitpid");
940
return false;
941
}
942
if(WIFEXITED(status)){
943
if(WEXITSTATUS(status) != 0){
944
fprintf_plus(stderr, "Error: iprouteadddel exited"
945
" with status %d\n", WEXITSTATUS(status));
946
return false;
947
}
948
return true;
949
}
950
if(WIFSIGNALED(status)){
951
fprintf_plus(stderr, "Error: iprouteadddel died by"
952
" signal %d\n", WTERMSIG(status));
953
return false;
954
}
955
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
956
return false;
957
}
958
959
__attribute__((nonnull, warn_unused_result))
960
static bool add_local_route(const char *address,
961
AvahiIfIndex if_index){
962
if(debug){
963
fprintf_plus(stderr, "Adding route to %s\n", address);
964
}
965
return add_delete_local_route(true, address, if_index);
966
}
967
968
__attribute__((nonnull, warn_unused_result))
969
static bool delete_local_route(const char *address,
970
AvahiIfIndex if_index){
971
if(debug){
972
fprintf_plus(stderr, "Removing route to %s\n", address);
973
}
974
return add_delete_local_route(false, address, if_index);
975
}
976
619
977
/* Called when a Mandos server is found */
620
static int start_mandos_communication(const char *ip, uint16_t port,
978
__attribute__((nonnull, warn_unused_result))
979
static int start_mandos_communication(const char *ip, in_port_t port,
621
980
AvahiIfIndex if_index,
622
int af){
981
int af, mandos_context *mc){
623
982
int ret, tcp_sd = -1;
624
983
ssize_t sret;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
984
struct sockaddr_storage to;
629
985
char *buffer = NULL;
630
986
char *decrypted_buffer = NULL;
631
987
size_t buffer_length = 0;
634
990
int retval = -1;
635
991
gnutls_session_t session;
636
992
int pf; /* Protocol family */
993
bool route_added = false;
637
994
638
995
errno = 0;
639
996
655
1012
return -1;
656
1013
}
657
1014
658
ret = init_gnutls_session(&session);
1015
/* If the interface is specified and we have a list of interfaces */
1016
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1017
/* Check if the interface is one of the interfaces we are using */
1018
bool match = false;
1019
{
1020
char *interface = NULL;
1021
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1022
interface))){
1023
if(if_nametoindex(interface) == (unsigned int)if_index){
1024
match = true;
1025
break;
1026
}
1027
}
1028
}
1029
if(not match){
1030
/* This interface does not match any in the list, so we don't
1031
connect to the server */
1032
if(debug){
1033
char interface[IF_NAMESIZE];
1034
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1035
perror_plus("if_indextoname");
1036
} else {
1037
fprintf_plus(stderr, "Skipping server on non-used interface"
1038
" \"%s\"\n",
1039
if_indextoname((unsigned int)if_index,
1040
interface));
1041
}
1042
}
1043
return -1;
1044
}
1045
}
1046
1047
ret = init_gnutls_session(&session, mc);
659
1048
if(ret != 0){
660
1049
return -1;
661
1050
}
662
1051
663
1052
if(debug){
664
1053
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
1054
PRIuMAX "\n", ip, (uintmax_t)port);
666
1055
}
667
1056
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
1057
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
669
1058
if(tcp_sd < 0){
670
1059
int e = errno;
671
1060
perror_plus("socket");
680
1069
681
1070
memset(&to, 0, sizeof(to));
682
1071
if(af == AF_INET6){
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1072
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1073
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
685
1074
} else { /* IPv4 */
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
1075
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1076
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
688
1077
}
689
1078
if(ret < 0 ){
690
1079
int e = errno;
699
1088
goto mandos_end;
700
1089
}
701
1090
if(af == AF_INET6){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
1091
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1092
if(IN6_IS_ADDR_LINKLOCAL
1093
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
709
1094
if(if_index == AVAHI_IF_UNSPEC){
710
1095
fprintf_plus(stderr, "An IPv6 link-local address is"
711
1096
" incomplete without a network interface\n");
713
1098
goto mandos_end;
714
1099
}
715
1100
/* Set the network interface number as scope */
716
to.in6.sin6_scope_id = (uint32_t)if_index;
1101
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
717
1102
}
718
1103
} else {
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
1104
((struct sockaddr_in *)&to)->sin_port = htons(port);
722
1105
}
723
1106
724
1107
if(quit_now){
732
1115
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
1116
perror_plus("if_indextoname");
734
1117
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
1118
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1119
"\n", ip, interface, (uintmax_t)port);
737
1120
}
738
1121
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
1122
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1123
ip, (uintmax_t)port);
741
1124
}
742
1125
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
1126
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
744
const char *pcret;
745
if(af == AF_INET6){
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
sizeof(addrstr));
748
} else {
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
sizeof(addrstr));
751
}
752
if(pcret == NULL){
753
perror_plus("inet_ntop");
754
} else {
755
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
757
}
758
}
759
}
760
761
if(quit_now){
762
errno = EINTR;
763
goto mandos_end;
764
}
765
766
if(af == AF_INET6){
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
768
} else {
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
770
}
771
if(ret < 0){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
int e = errno;
774
perror_plus("connect");
775
errno = e;
776
}
777
goto mandos_end;
778
}
779
780
if(quit_now){
781
errno = EINTR;
782
goto mandos_end;
1127
if(af == AF_INET6){
1128
ret = getnameinfo((struct sockaddr *)&to,
1129
sizeof(struct sockaddr_in6),
1130
addrstr, sizeof(addrstr), NULL, 0,
1131
NI_NUMERICHOST);
1132
} else {
1133
ret = getnameinfo((struct sockaddr *)&to,
1134
sizeof(struct sockaddr_in),
1135
addrstr, sizeof(addrstr), NULL, 0,
1136
NI_NUMERICHOST);
1137
}
1138
if(ret == EAI_SYSTEM){
1139
perror_plus("getnameinfo");
1140
} else if(ret != 0) {
1141
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1142
} else if(strcmp(addrstr, ip) != 0){
1143
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1144
}
1145
}
1146
1147
if(quit_now){
1148
errno = EINTR;
1149
goto mandos_end;
1150
}
1151
1152
while(true){
1153
if(af == AF_INET6){
1154
ret = connect(tcp_sd, (struct sockaddr *)&to,
1155
sizeof(struct sockaddr_in6));
1156
} else {
1157
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1158
sizeof(struct sockaddr_in));
1159
}
1160
if(ret < 0){
1161
if(errno == ENETUNREACH
1162
and if_index != AVAHI_IF_UNSPEC
1163
and connect_to == NULL
1164
and not route_added and
1165
((af == AF_INET6 and not
1166
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1167
&to)->sin6_addr)))
1168
or (af == AF_INET and
1169
/* Not a a IPv4LL address */
1170
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1171
& 0xFFFF0000L) != 0xA9FE0000L))){
1172
/* Work around Avahi bug - Avahi does not announce link-local
1173
addresses if it has a global address, so local hosts with
1174
*only* a link-local address (e.g. Mandos clients) cannot
1175
connect to a Mandos server announced by Avahi on a server
1176
host with a global address. Work around this by retrying
1177
with an explicit route added with the server's address.
1178
1179
Avahi bug reference:
1180
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1181
https://bugs.debian.org/587961
1182
*/
1183
if(debug){
1184
fprintf_plus(stderr, "Mandos server unreachable, trying"
1185
" direct route\n");
1186
}
1187
int e = errno;
1188
route_added = add_local_route(ip, if_index);
1189
if(route_added){
1190
continue;
1191
}
1192
errno = e;
1193
}
1194
if(errno != ECONNREFUSED or debug){
1195
int e = errno;
1196
perror_plus("connect");
1197
errno = e;
1198
}
1199
goto mandos_end;
1200
}
1201
1202
if(quit_now){
1203
errno = EINTR;
1204
goto mandos_end;
1205
}
1206
break;
783
1207
}
784
1208
785
1209
const char *out = mandos_protocol_version;
936
1360
if(buffer_length > 0){
937
1361
ssize_t decrypted_buffer_size;
938
1362
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
939
&decrypted_buffer);
1363
&decrypted_buffer, mc);
940
1364
if(decrypted_buffer_size >= 0){
941
1365
942
1366
written = 0;
968
1392
969
1393
mandos_end:
970
1394
{
1395
if(route_added){
1396
if(not delete_local_route(ip, if_index)){
1397
fprintf_plus(stderr, "Failed to delete local route to %s on"
1398
" interface %d", ip, if_index);
1399
}
1400
}
971
1401
int e = errno;
972
1402
free(decrypted_buffer);
973
1403
free(buffer);
990
1420
return retval;
991
1421
}
992
1422
1423
__attribute__((nonnull))
993
1424
static void resolve_callback(AvahiSServiceResolver *r,
994
1425
AvahiIfIndex interface,
995
1426
AvahiProtocol proto,
1003
1434
AVAHI_GCC_UNUSED AvahiStringList *txt,
1004
1435
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1005
1436
flags,
1006
AVAHI_GCC_UNUSED void* userdata){
1007
assert(r);
1437
void *mc){
1438
if(r == NULL){
1439
return;
1440
}
1008
1441
1009
1442
/* Called whenever a service has been resolved successfully or
1010
1443
timed out */
1011
1444
1012
1445
if(quit_now){
1446
avahi_s_service_resolver_free(r);
1013
1447
return;
1014
1448
}
1015
1449
1019
1453
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1020
1454
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1021
1455
domain,
1022
avahi_strerror(avahi_server_errno(mc.server)));
1456
avahi_strerror(avahi_server_errno
1457
(((mandos_context*)mc)->server)));
1023
1458
break;
1024
1459
1025
1460
case AVAHI_RESOLVER_FOUND:
1031
1466
PRIdMAX ") on port %" PRIu16 "\n", name,
1032
1467
host_name, ip, (intmax_t)interface, port);
1033
1468
}
1034
int ret = start_mandos_communication(ip, port, interface,
1035
avahi_proto_to_af(proto));
1469
int ret = start_mandos_communication(ip, (in_port_t)port,
1470
interface,
1471
avahi_proto_to_af(proto),
1472
mc);
1036
1473
if(ret == 0){
1037
avahi_simple_poll_quit(mc.simple_poll);
1474
avahi_simple_poll_quit(simple_poll);
1038
1475
} else {
1039
if(not add_server(ip, port, interface,
1040
avahi_proto_to_af(proto))){
1476
if(not add_server(ip, (in_port_t)port, interface,
1477
avahi_proto_to_af(proto),
1478
&((mandos_context*)mc)->current_server)){
1041
1479
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1042
1480
" list\n", name);
1043
1481
}
1056
1494
const char *domain,
1057
1495
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1058
1496
flags,
1059
AVAHI_GCC_UNUSED void* userdata){
1060
assert(b);
1497
void *mc){
1498
if(b == NULL){
1499
return;
1500
}
1061
1501
1062
1502
/* Called whenever a new services becomes available on the LAN or
1063
1503
is removed from the LAN */
1071
1511
case AVAHI_BROWSER_FAILURE:
1072
1512
1073
1513
fprintf_plus(stderr, "(Avahi browser) %s\n",
1074
avahi_strerror(avahi_server_errno(mc.server)));
1075
avahi_simple_poll_quit(mc.simple_poll);
1514
avahi_strerror(avahi_server_errno
1515
(((mandos_context*)mc)->server)));
1516
avahi_simple_poll_quit(simple_poll);
1076
1517
return;
1077
1518
1078
1519
case AVAHI_BROWSER_NEW:
1081
1522
the callback function is called the Avahi server will free the
1082
1523
resolver for us. */
1083
1524
1084
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1085
name, type, domain, protocol, 0,
1086
resolve_callback, NULL) == NULL)
1525
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1526
interface, protocol, name, type,
1527
domain, protocol, 0,
1528
resolve_callback, mc) == NULL)
1087
1529
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1088
1530
" %s\n", name,
1089
avahi_strerror(avahi_server_errno(mc.server)));
1531
avahi_strerror(avahi_server_errno
1532
(((mandos_context*)mc)->server)));
1090
1533
break;
1091
1534
1092
1535
case AVAHI_BROWSER_REMOVE:
1111
1554
signal_received = sig;
1112
1555
int old_errno = errno;
1113
1556
/* set main loop to exit */
1114
if(mc.simple_poll != NULL){
1115
avahi_simple_poll_quit(mc.simple_poll);
1557
if(simple_poll != NULL){
1558
avahi_simple_poll_quit(simple_poll);
1116
1559
}
1117
1560
errno = old_errno;
1118
1561
}
1119
1562
1563
__attribute__((nonnull, warn_unused_result))
1120
1564
bool get_flags(const char *ifname, struct ifreq *ifr){
1121
1565
int ret;
1566
error_t ret_errno;
1122
1567
1123
1568
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1124
1569
if(s < 0){
1570
ret_errno = errno;
1125
1571
perror_plus("socket");
1572
errno = ret_errno;
1126
1573
return false;
1127
1574
}
1128
1575
strcpy(ifr->ifr_name, ifname);
1129
1576
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1130
1577
if(ret == -1){
1131
1578
if(debug){
1579
ret_errno = errno;
1132
1580
perror_plus("ioctl SIOCGIFFLAGS");
1581
errno = ret_errno;
1133
1582
}
1134
1583
return false;
1135
1584
}
1136
1585
return true;
1137
1586
}
1138
1587
1588
__attribute__((nonnull, warn_unused_result))
1139
1589
bool good_flags(const char *ifname, const struct ifreq *ifr){
1140
1590
1141
1591
/* Reject the loopback device */
1183
1633
* corresponds to an acceptable network device.
1184
1634
* (This function is passed to scandir(3) as a filter function.)
1185
1635
*/
1636
__attribute__((nonnull, warn_unused_result))
1186
1637
int good_interface(const struct dirent *if_entry){
1187
1638
if(if_entry->d_name[0] == '.'){
1188
1639
return 0;
1204
1655
}
1205
1656
1206
1657
/*
1207
* This function determines if a directory entry in /sys/class/net
1208
* corresponds to an acceptable network device which is up.
1209
* (This function is passed to scandir(3) as a filter function.)
1210
*/
1211
int up_interface(const struct dirent *if_entry){
1212
if(if_entry->d_name[0] == '.'){
1213
return 0;
1214
}
1215
1216
struct ifreq ifr;
1217
if(not get_flags(if_entry->d_name, &ifr)){
1218
if(debug){
1219
fprintf_plus(stderr, "Failed to get flags for interface "
1220
"\"%s\"\n", if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject down interfaces */
1226
if(not (ifr.ifr_flags & IFF_UP)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
/* Reject non-running interfaces */
1235
if(not (ifr.ifr_flags & IFF_RUNNING)){
1236
if(debug){
1237
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
if(not good_flags(if_entry->d_name, &ifr)){
1244
return 0;
1245
}
1246
return 1;
1247
}
1248
1658
* This function determines if a network interface is up.
1659
*/
1660
__attribute__((nonnull, warn_unused_result))
1661
bool interface_is_up(const char *interface){
1662
struct ifreq ifr;
1663
if(not get_flags(interface, &ifr)){
1664
if(debug){
1665
fprintf_plus(stderr, "Failed to get flags for interface "
1666
"\"%s\"\n", interface);
1667
}
1668
return false;
1669
}
1670
1671
return (bool)(ifr.ifr_flags & IFF_UP);
1672
}
1673
1674
/*
1675
* This function determines if a network interface is running
1676
*/
1677
__attribute__((nonnull, warn_unused_result))
1678
bool interface_is_running(const char *interface){
1679
struct ifreq ifr;
1680
if(not get_flags(interface, &ifr)){
1681
if(debug){
1682
fprintf_plus(stderr, "Failed to get flags for interface "
1683
"\"%s\"\n", interface);
1684
}
1685
return false;
1686
}
1687
1688
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1689
}
1690
1691
__attribute__((nonnull, pure, warn_unused_result))
1249
1692
int notdotentries(const struct dirent *direntry){
1250
1693
/* Skip "." and ".." */
1251
1694
if(direntry->d_name[0] == '.'
1258
1701
}
1259
1702
1260
1703
/* Is this directory entry a runnable program? */
1704
__attribute__((nonnull, warn_unused_result))
1261
1705
int runnable_hook(const struct dirent *direntry){
1262
1706
int ret;
1263
1707
size_t sret;
1271
1715
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
1716
"abcdefghijklmnopqrstuvwxyz"
1273
1717
"0123456789"
1274
"_-");
1718
"_.-");
1275
1719
if((direntry->d_name)[sret] != '\0'){
1276
1720
/* Contains non-allowed characters */
1277
1721
if(debug){
1281
1725
return 0;
1282
1726
}
1283
1727
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1728
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1292
1729
if(ret == -1){
1293
1730
if(debug){
1294
1731
perror_plus("Could not stat hook");
1318
1755
return 1;
1319
1756
}
1320
1757
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1758
__attribute__((nonnull, warn_unused_result))
1759
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1760
mandos_context *mc){
1322
1761
int ret;
1323
1762
struct timespec now;
1324
1763
struct timespec waited_time;
1325
1764
intmax_t block_time;
1326
1765
1327
1766
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1767
if(mc->current_server == NULL){
1768
if(debug){
1330
1769
fprintf_plus(stderr, "Wait until first server is found."
1331
1770
" No timeout!\n");
1332
1771
}
1333
1772
ret = avahi_simple_poll_iterate(s, -1);
1334
1773
} else {
1335
if (debug){
1774
if(debug){
1336
1775
fprintf_plus(stderr, "Check current_server if we should run"
1337
1776
" it, or wait\n");
1338
1777
}
1345
1784
/* Calculating in ms how long time between now and server
1346
1785
who we visted longest time ago. Now - last seen. */
1347
1786
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1787
- mc->current_server->last_seen.tv_sec);
1349
1788
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1789
- mc->current_server->last_seen.tv_nsec);
1351
1790
/* total time is 10s/10,000ms.
1352
1791
Converting to s from ms by dividing by 1,000,
1353
1792
and ns to ms by dividing by 1,000,000. */
1355
1794
- ((intmax_t)waited_time.tv_sec * 1000))
1356
1795
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1796
1358
if (debug){
1797
if(debug){
1359
1798
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
1799
block_time);
1361
1800
}
1362
1801
1363
1802
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1803
ret = start_mandos_communication(mc->current_server->ip,
1804
mc->current_server->port,
1805
mc->current_server->if_index,
1806
mc->current_server->af, mc);
1368
1807
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1808
avahi_simple_poll_quit(s);
1370
1809
return 0;
1371
1810
}
1372
1811
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1812
&mc->current_server->last_seen);
1374
1813
if(ret == -1){
1375
1814
perror_plus("clock_gettime");
1376
1815
return -1;
1377
1816
}
1378
mc.current_server = mc.current_server->next;
1817
mc->current_server = mc->current_server->next;
1379
1818
block_time = 0; /* Call avahi to find new Mandos
1380
1819
servers, but don't block */
1381
1820
}
1383
1822
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
1823
}
1385
1824
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1825
if(ret > 0 or errno != EINTR){
1387
1826
return (ret != 1) ? ret : 0;
1388
1827
}
1389
1828
}
1390
1829
}
1391
1830
}
1392
1831
1393
bool run_network_hooks(const char *mode, const char *interface,
1832
__attribute__((nonnull))
1833
void run_network_hooks(const char *mode, const char *interface,
1394
1834
const float delay){
1395
struct dirent **direntries;
1396
struct dirent *direntry;
1397
int ret;
1398
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1399
alphasort);
1835
struct dirent **direntries = NULL;
1836
if(hookdir_fd == -1){
1837
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1838
| O_CLOEXEC);
1839
if(hookdir_fd == -1){
1840
if(errno == ENOENT){
1841
if(debug){
1842
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1843
" found\n", hookdir);
1844
}
1845
} else {
1846
perror_plus("open");
1847
}
1848
return;
1849
}
1850
}
1851
#ifdef __GLIBC__
1852
#if __GLIBC_PREREQ(2, 15)
1853
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1854
runnable_hook, alphasort);
1855
#else /* not __GLIBC_PREREQ(2, 15) */
1856
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1857
alphasort);
1858
#endif /* not __GLIBC_PREREQ(2, 15) */
1859
#else /* not __GLIBC__ */
1860
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1861
alphasort);
1862
#endif /* not __GLIBC__ */
1400
1863
if(numhooks == -1){
1401
1864
perror_plus("scandir");
1402
} else {
1403
int devnull = open("/dev/null", O_RDONLY);
1404
for(int i = 0; i < numhooks; i++){
1405
direntry = direntries[i];
1406
char *fullname = NULL;
1407
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1408
if(ret < 0){
1865
return;
1866
}
1867
struct dirent *direntry;
1868
int ret;
1869
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1870
if(devnull == -1){
1871
perror_plus("open(\"/dev/null\", O_RDONLY)");
1872
return;
1873
}
1874
for(int i = 0; i < numhooks; i++){
1875
direntry = direntries[i];
1876
if(debug){
1877
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1878
direntry->d_name);
1879
}
1880
pid_t hook_pid = fork();
1881
if(hook_pid == 0){
1882
/* Child */
1883
/* Raise privileges */
1884
errno = raise_privileges_permanently();
1885
if(errno != 0){
1886
perror_plus("Failed to raise privileges");
1887
_exit(EX_NOPERM);
1888
}
1889
/* Set group */
1890
errno = 0;
1891
ret = setgid(0);
1892
if(ret == -1){
1893
perror_plus("setgid");
1894
_exit(EX_NOPERM);
1895
}
1896
/* Reset supplementary groups */
1897
errno = 0;
1898
ret = setgroups(0, NULL);
1899
if(ret == -1){
1900
perror_plus("setgroups");
1901
_exit(EX_NOPERM);
1902
}
1903
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1904
if(ret == -1){
1905
perror_plus("setenv");
1906
_exit(EX_OSERR);
1907
}
1908
ret = setenv("DEVICE", interface, 1);
1909
if(ret == -1){
1910
perror_plus("setenv");
1911
_exit(EX_OSERR);
1912
}
1913
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1914
if(ret == -1){
1915
perror_plus("setenv");
1916
_exit(EX_OSERR);
1917
}
1918
ret = setenv("MODE", mode, 1);
1919
if(ret == -1){
1920
perror_plus("setenv");
1921
_exit(EX_OSERR);
1922
}
1923
char *delaystring;
1924
ret = asprintf(&delaystring, "%f", (double)delay);
1925
if(ret == -1){
1409
1926
perror_plus("asprintf");
1410
continue;
1411
}
1412
if(debug){
1413
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1414
direntry->d_name);
1415
}
1416
pid_t hook_pid = fork();
1417
if(hook_pid == 0){
1418
/* Child */
1419
/* Raise privileges */
1420
errno = 0;
1421
ret = seteuid(0);
1422
if(ret == -1){
1423
perror_plus("seteuid");
1424
}
1425
/* Raise privileges even more */
1426
errno = 0;
1427
ret = setuid(0);
1428
if(ret == -1){
1429
perror_plus("setuid");
1430
}
1431
/* Set group */
1432
errno = 0;
1433
ret = setgid(0);
1434
if(ret == -1){
1435
perror_plus("setgid");
1436
}
1437
/* Reset supplementary groups */
1438
errno = 0;
1439
ret = setgroups(0, NULL);
1440
if(ret == -1){
1441
perror_plus("setgroups");
1442
}
1443
dup2(devnull, STDIN_FILENO);
1444
close(devnull);
1445
dup2(STDERR_FILENO, STDOUT_FILENO);
1446
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("DEVICE", interface, 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
ret = setenv("MODE", mode, 1);
1462
if(ret == -1){
1463
perror_plus("setenv");
1464
_exit(EX_OSERR);
1465
}
1466
char *delaystring;
1467
ret = asprintf(&delaystring, "%f", delay);
1468
if(ret == -1){
1469
perror_plus("asprintf");
1470
_exit(EX_OSERR);
1471
}
1472
ret = setenv("DELAY", delaystring, 1);
1473
if(ret == -1){
1474
free(delaystring);
1475
perror_plus("setenv");
1476
_exit(EX_OSERR);
1477
}
1927
_exit(EX_OSERR);
1928
}
1929
ret = setenv("DELAY", delaystring, 1);
1930
if(ret == -1){
1478
1931
free(delaystring);
1479
if(connect_to != NULL){
1480
ret = setenv("CONNECT", connect_to, 1);
1481
if(ret == -1){
1482
perror_plus("setenv");
1483
_exit(EX_OSERR);
1484
}
1485
}
1486
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1487
perror_plus("execl");
1488
_exit(EXIT_FAILURE);
1489
}
1490
} else {
1491
int status;
1492
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1493
perror_plus("waitpid");
1494
free(fullname);
1495
continue;
1496
}
1497
if(WIFEXITED(status)){
1498
if(WEXITSTATUS(status) != 0){
1499
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1500
" with status %d\n", direntry->d_name,
1501
WEXITSTATUS(status));
1502
free(fullname);
1503
continue;
1504
}
1505
} else if(WIFSIGNALED(status)){
1506
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1507
" signal %d\n", direntry->d_name,
1508
WTERMSIG(status));
1509
free(fullname);
1510
continue;
1511
} else {
1512
fprintf_plus(stderr, "Warning: network hook \"%s\""
1513
" crashed\n", direntry->d_name);
1514
free(fullname);
1515
continue;
1516
}
1517
}
1518
free(fullname);
1519
if(debug){
1520
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1521
direntry->d_name);
1522
}
1523
}
1524
close(devnull);
1525
}
1526
return true;
1932
perror_plus("setenv");
1933
_exit(EX_OSERR);
1934
}
1935
free(delaystring);
1936
if(connect_to != NULL){
1937
ret = setenv("CONNECT", connect_to, 1);
1938
if(ret == -1){
1939
perror_plus("setenv");
1940
_exit(EX_OSERR);
1941
}
1942
}
1943
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1944
direntry->d_name,
1945
O_RDONLY));
1946
if(hook_fd == -1){
1947
perror_plus("openat");
1948
_exit(EXIT_FAILURE);
1949
}
1950
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1951
perror_plus("close");
1952
_exit(EXIT_FAILURE);
1953
}
1954
ret = dup2(devnull, STDIN_FILENO);
1955
if(ret == -1){
1956
perror_plus("dup2(devnull, STDIN_FILENO)");
1957
_exit(EX_OSERR);
1958
}
1959
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1960
if(ret == -1){
1961
perror_plus("close");
1962
_exit(EX_OSERR);
1963
}
1964
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1965
if(ret == -1){
1966
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1967
_exit(EX_OSERR);
1968
}
1969
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1970
environ) == -1){
1971
perror_plus("fexecve");
1972
_exit(EXIT_FAILURE);
1973
}
1974
} else {
1975
if(hook_pid == -1){
1976
perror_plus("fork");
1977
free(direntry);
1978
continue;
1979
}
1980
int status;
1981
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1982
perror_plus("waitpid");
1983
free(direntry);
1984
continue;
1985
}
1986
if(WIFEXITED(status)){
1987
if(WEXITSTATUS(status) != 0){
1988
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1989
" with status %d\n", direntry->d_name,
1990
WEXITSTATUS(status));
1991
free(direntry);
1992
continue;
1993
}
1994
} else if(WIFSIGNALED(status)){
1995
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1996
" signal %d\n", direntry->d_name,
1997
WTERMSIG(status));
1998
free(direntry);
1999
continue;
2000
} else {
2001
fprintf_plus(stderr, "Warning: network hook \"%s\""
2002
" crashed\n", direntry->d_name);
2003
free(direntry);
2004
continue;
2005
}
2006
}
2007
if(debug){
2008
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2009
direntry->d_name);
2010
}
2011
free(direntry);
2012
}
2013
free(direntries);
2014
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2015
perror_plus("close");
2016
} else {
2017
hookdir_fd = -1;
2018
}
2019
close(devnull);
2020
}
2021
2022
__attribute__((nonnull, warn_unused_result))
2023
error_t bring_up_interface(const char *const interface,
2024
const float delay){
2025
error_t old_errno = errno;
2026
int ret;
2027
struct ifreq network;
2028
unsigned int if_index = if_nametoindex(interface);
2029
if(if_index == 0){
2030
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2031
errno = old_errno;
2032
return ENXIO;
2033
}
2034
2035
if(quit_now){
2036
errno = old_errno;
2037
return EINTR;
2038
}
2039
2040
if(not interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2042
if(not get_flags(interface, &network)){
2043
ret_errno = errno;
2044
fprintf_plus(stderr, "Failed to get flags for interface "
2045
"\"%s\"\n", interface);
2046
errno = old_errno;
2047
return ret_errno;
2048
}
2049
network.ifr_flags |= IFF_UP; /* set flag */
2050
2051
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2052
if(sd == -1){
2053
ret_errno = errno;
2054
perror_plus("socket");
2055
errno = old_errno;
2056
return ret_errno;
2057
}
2058
2059
if(quit_now){
2060
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2061
if(ret == -1){
2062
perror_plus("close");
2063
}
2064
errno = old_errno;
2065
return EINTR;
2066
}
2067
2068
if(debug){
2069
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2070
interface);
2071
}
2072
2073
/* Raise privileges */
2074
ret_errno = raise_privileges();
2075
if(ret_errno != 0){
2076
errno = ret_errno;
2077
perror_plus("Failed to raise privileges");
2078
}
2079
2080
#ifdef __linux__
2081
int ret_linux;
2082
bool restore_loglevel = false;
2083
if(ret_errno == 0){
2084
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2085
messages about the network interface to mess up the prompt */
2086
ret_linux = klogctl(8, NULL, 5);
2087
if(ret_linux == -1){
2088
perror_plus("klogctl");
2089
} else {
2090
restore_loglevel = true;
2091
}
2092
}
2093
#endif /* __linux__ */
2094
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2095
ioctl_errno = errno;
2096
#ifdef __linux__
2097
if(restore_loglevel){
2098
ret_linux = klogctl(7, NULL, 0);
2099
if(ret_linux == -1){
2100
perror_plus("klogctl");
2101
}
2102
}
2103
#endif /* __linux__ */
2104
2105
/* If raise_privileges() succeeded above */
2106
if(ret_errno == 0){
2107
/* Lower privileges */
2108
ret_errno = lower_privileges();
2109
if(ret_errno != 0){
2110
errno = ret_errno;
2111
perror_plus("Failed to lower privileges");
2112
}
2113
}
2114
2115
/* Close the socket */
2116
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2117
if(ret == -1){
2118
perror_plus("close");
2119
}
2120
2121
if(ret_setflags == -1){
2122
errno = ioctl_errno;
2123
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2124
errno = old_errno;
2125
return ioctl_errno;
2126
}
2127
} else if(debug){
2128
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2129
interface);
2130
}
2131
2132
/* Sleep checking until interface is running.
2133
Check every 0.25s, up to total time of delay */
2134
for(int i=0; i < delay * 4; i++){
2135
if(interface_is_running(interface)){
2136
break;
2137
}
2138
struct timespec sleeptime = { .tv_nsec = 250000000 };
2139
ret = nanosleep(&sleeptime, NULL);
2140
if(ret == -1 and errno != EINTR){
2141
perror_plus("nanosleep");
2142
}
2143
}
2144
2145
errno = old_errno;
2146
return 0;
2147
}
2148
2149
__attribute__((nonnull, warn_unused_result))
2150
error_t take_down_interface(const char *const interface){
2151
error_t old_errno = errno;
2152
struct ifreq network;
2153
unsigned int if_index = if_nametoindex(interface);
2154
if(if_index == 0){
2155
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2156
errno = old_errno;
2157
return ENXIO;
2158
}
2159
if(interface_is_up(interface)){
2160
error_t ret_errno = 0, ioctl_errno = 0;
2161
if(not get_flags(interface, &network) and debug){
2162
ret_errno = errno;
2163
fprintf_plus(stderr, "Failed to get flags for interface "
2164
"\"%s\"\n", interface);
2165
errno = old_errno;
2166
return ret_errno;
2167
}
2168
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2169
2170
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2171
if(sd == -1){
2172
ret_errno = errno;
2173
perror_plus("socket");
2174
errno = old_errno;
2175
return ret_errno;
2176
}
2177
2178
if(debug){
2179
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2180
interface);
2181
}
2182
2183
/* Raise privileges */
2184
ret_errno = raise_privileges();
2185
if(ret_errno != 0){
2186
errno = ret_errno;
2187
perror_plus("Failed to raise privileges");
2188
}
2189
2190
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2191
ioctl_errno = errno;
2192
2193
/* If raise_privileges() succeeded above */
2194
if(ret_errno == 0){
2195
/* Lower privileges */
2196
ret_errno = lower_privileges();
2197
if(ret_errno != 0){
2198
errno = ret_errno;
2199
perror_plus("Failed to lower privileges");
2200
}
2201
}
2202
2203
/* Close the socket */
2204
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2205
if(ret == -1){
2206
perror_plus("close");
2207
}
2208
2209
if(ret_setflags == -1){
2210
errno = ioctl_errno;
2211
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2212
errno = old_errno;
2213
return ioctl_errno;
2214
}
2215
} else if(debug){
2216
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2217
interface);
2218
}
2219
2220
errno = old_errno;
2221
return 0;
1527
2222
}
1528
2223
1529
2224
int main(int argc, char *argv[]){
2225
mandos_context mc = { .server = NULL, .dh_bits = 0,
2226
.priority = "SECURE256:!CTYPE-X.509:"
2227
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2228
.interfaces = NULL, .interfaces_size = 0 };
1530
2229
AvahiSServiceBrowser *sb = NULL;
1531
int error;
2230
error_t ret_errno;
1532
2231
int ret;
1533
2232
intmax_t tmpmax;
1534
2233
char *tmp;
1535
2234
int exitcode = EXIT_SUCCESS;
1536
const char *interface = "";
1537
struct ifreq network;
1538
int sd = -1;
1539
bool take_down_interface = false;
1540
uid_t uid;
1541
gid_t gid;
1542
char tempdir[] = "/tmp/mandosXXXXXX";
1543
bool tempdir_created = false;
2235
char *interfaces_to_take_down = NULL;
2236
size_t interfaces_to_take_down_size = 0;
2237
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2238
char old_tempdir[] = "/tmp/mandosXXXXXX";
2239
char *tempdir = NULL;
1544
2240
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1545
2241
const char *seckey = PATHDIR "/" SECKEY;
1546
2242
const char *pubkey = PATHDIR "/" PUBKEY;
2243
char *interfaces_hooks = NULL;
1547
2244
1548
2245
bool gnutls_initialized = false;
1549
2246
bool gpgme_initialized = false;
1640
2337
connect_to = arg;
1641
2338
break;
1642
2339
case 'i': /* --interface */
1643
interface = arg;
2340
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2341
arg, (int)',');
2342
if(ret_errno != 0){
2343
argp_error(state, "%s", strerror(ret_errno));
2344
}
1644
2345
break;
1645
2346
case 's': /* --seckey */
1646
2347
seckey = arg;
1718
2419
goto end;
1719
2420
}
1720
2421
}
1721
2422
1722
2423
{
1723
2424
/* Work around Debian bug #633582:
1724
2425
<http://bugs.debian.org/633582> */
1725
2426
1726
/* Re-raise priviliges */
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror_plus("seteuid");
2427
/* Re-raise privileges */
2428
ret_errno = raise_privileges();
2429
if(ret_errno != 0){
2430
errno = ret_errno;
2431
perror_plus("Failed to raise privileges");
1731
2432
} else {
1732
2433
struct stat st;
1733
2434
1751
2452
TEMP_FAILURE_RETRY(close(seckey_fd));
1752
2453
}
1753
2454
}
1754
2455
1755
2456
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1756
2457
int pubkey_fd = open(pubkey, O_RDONLY);
1757
2458
if(pubkey_fd == -1){
1772
2473
TEMP_FAILURE_RETRY(close(pubkey_fd));
1773
2474
}
1774
2475
}
1775
2476
1776
2477
/* Lower privileges */
1777
errno = 0;
1778
ret = seteuid(uid);
1779
if(ret == -1){
1780
perror_plus("seteuid");
2478
ret_errno = lower_privileges();
2479
if(ret_errno != 0){
2480
errno = ret_errno;
2481
perror_plus("Failed to lower privileges");
2482
}
2483
}
2484
}
2485
2486
/* Remove invalid interface names (except "none") */
2487
{
2488
char *interface = NULL;
2489
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2490
interface))){
2491
if(strcmp(interface, "none") != 0
2492
and if_nametoindex(interface) == 0){
2493
if(interface[0] != '\0'){
2494
fprintf_plus(stderr, "Not using nonexisting interface"
2495
" \"%s\"\n", interface);
2496
}
2497
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2498
interface = NULL;
1781
2499
}
1782
2500
}
1783
2501
}
1784
2502
1785
2503
/* Run network hooks */
1786
if(not run_network_hooks("start", interface, delay)){
1787
goto end;
2504
{
2505
if(mc.interfaces != NULL){
2506
interfaces_hooks = malloc(mc.interfaces_size);
2507
if(interfaces_hooks == NULL){
2508
perror_plus("malloc");
2509
goto end;
2510
}
2511
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2512
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2513
}
2514
run_network_hooks("start", interfaces_hooks != NULL ?
2515
interfaces_hooks : "", delay);
1788
2516
}
1789
2517
1790
2518
if(not debug){
1791
2519
avahi_set_log_function(empty_log);
1792
2520
}
1793
2521
1794
if(interface[0] == '\0'){
1795
struct dirent **direntries;
1796
/* First look for interfaces that are up */
1797
ret = scandir(sys_class_net, &direntries, up_interface,
1798
alphasort);
1799
if(ret == 0){
1800
/* No up interfaces, look for any good interfaces */
1801
free(direntries);
1802
ret = scandir(sys_class_net, &direntries, good_interface,
1803
alphasort);
1804
}
1805
if(ret >= 1){
1806
/* Pick the first interface returned */
1807
interface = strdup(direntries[0]->d_name);
1808
if(debug){
1809
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1810
}
1811
if(interface == NULL){
1812
perror_plus("malloc");
1813
free(direntries);
1814
exitcode = EXIT_FAILURE;
1815
goto end;
1816
}
1817
free(direntries);
1818
} else {
1819
free(direntries);
1820
fprintf_plus(stderr, "Could not find a network interface\n");
1821
exitcode = EXIT_FAILURE;
1822
goto end;
1823
}
1824
}
1825
1826
2522
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1827
2523
from the signal handler */
1828
2524
/* Initialize the pseudo-RNG for Avahi */
1829
2525
srand((unsigned int) time(NULL));
1830
mc.simple_poll = avahi_simple_poll_new();
1831
if(mc.simple_poll == NULL){
2526
simple_poll = avahi_simple_poll_new();
2527
if(simple_poll == NULL){
1832
2528
fprintf_plus(stderr,
1833
2529
"Avahi: Failed to create simple poll object.\n");
1834
2530
exitcode = EX_UNAVAILABLE;
1898
2594
}
1899
2595
}
1900
2596
1901
/* If the interface is down, bring it up */
1902
if(strcmp(interface, "none") != 0){
1903
if_index = (AvahiIfIndex) if_nametoindex(interface);
1904
if(if_index == 0){
1905
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1906
exitcode = EX_UNAVAILABLE;
1907
goto end;
1908
}
1909
1910
if(quit_now){
1911
goto end;
1912
}
1913
1914
/* Re-raise priviliges */
1915
errno = 0;
1916
ret = seteuid(0);
1917
if(ret == -1){
1918
perror_plus("seteuid");
1919
}
1920
1921
#ifdef __linux__
1922
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1923
messages about the network interface to mess up the prompt */
1924
ret = klogctl(8, NULL, 5);
1925
bool restore_loglevel = true;
1926
if(ret == -1){
1927
restore_loglevel = false;
1928
perror_plus("klogctl");
1929
}
1930
#endif /* __linux__ */
1931
1932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
if(sd < 0){
1934
perror_plus("socket");
1935
exitcode = EX_OSERR;
1936
#ifdef __linux__
1937
if(restore_loglevel){
1938
ret = klogctl(7, NULL, 0);
1939
if(ret == -1){
1940
perror_plus("klogctl");
1941
}
1942
}
1943
#endif /* __linux__ */
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1950
goto end;
1951
}
1952
strcpy(network.ifr_name, interface);
1953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1954
if(ret == -1){
1955
perror_plus("ioctl SIOCGIFFLAGS");
1956
#ifdef __linux__
1957
if(restore_loglevel){
1958
ret = klogctl(7, NULL, 0);
1959
if(ret == -1){
1960
perror_plus("klogctl");
1961
}
1962
}
1963
#endif /* __linux__ */
1964
exitcode = EX_OSERR;
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1971
goto end;
1972
}
1973
if((network.ifr_flags & IFF_UP) == 0){
1974
network.ifr_flags |= IFF_UP;
1975
take_down_interface = true;
1976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1977
if(ret == -1){
1978
take_down_interface = false;
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1980
exitcode = EX_OSERR;
1981
#ifdef __linux__
1982
if(restore_loglevel){
1983
ret = klogctl(7, NULL, 0);
1984
if(ret == -1){
1985
perror_plus("klogctl");
2597
/* If no interfaces were specified, make a list */
2598
if(mc.interfaces == NULL){
2599
struct dirent **direntries = NULL;
2600
/* Look for any good interfaces */
2601
ret = scandir(sys_class_net, &direntries, good_interface,
2602
alphasort);
2603
if(ret >= 1){
2604
/* Add all found interfaces to interfaces list */
2605
for(int i = 0; i < ret; ++i){
2606
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2607
direntries[i]->d_name);
2608
if(ret_errno != 0){
2609
errno = ret_errno;
2610
perror_plus("argz_add");
2611
free(direntries[i]);
2612
continue;
2613
}
2614
if(debug){
2615
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2616
direntries[i]->d_name);
2617
}
2618
free(direntries[i]);
2619
}
2620
free(direntries);
2621
} else {
2622
if(ret == 0){
2623
free(direntries);
2624
}
2625
fprintf_plus(stderr, "Could not find a network interface\n");
2626
exitcode = EXIT_FAILURE;
2627
goto end;
2628
}
2629
}
2630
2631
/* Bring up interfaces which are down, and remove any "none"s */
2632
{
2633
char *interface = NULL;
2634
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2635
interface))){
2636
/* If interface name is "none", stop bringing up interfaces.
2637
Also remove all instances of "none" from the list */
2638
if(strcmp(interface, "none") == 0){
2639
argz_delete(&mc.interfaces, &mc.interfaces_size,
2640
interface);
2641
interface = NULL;
2642
while((interface = argz_next(mc.interfaces,
2643
mc.interfaces_size, interface))){
2644
if(strcmp(interface, "none") == 0){
2645
argz_delete(&mc.interfaces, &mc.interfaces_size,
2646
interface);
2647
interface = NULL;
1986
2648
}
1987
2649
}
1988
#endif /* __linux__ */
1989
/* Lower privileges */
1990
errno = 0;
1991
ret = seteuid(uid);
1992
if(ret == -1){
1993
perror_plus("seteuid");
1994
}
1995
goto end;
1996
}
1997
}
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
2000
for(int i=0; i < delay * 4; i++){
2001
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2002
if(ret == -1){
2003
perror_plus("ioctl SIOCGIFFLAGS");
2004
} else if(network.ifr_flags & IFF_RUNNING){
2005
2650
break;
2006
2651
}
2007
struct timespec sleeptime = { .tv_nsec = 250000000 };
2008
ret = nanosleep(&sleeptime, NULL);
2009
if(ret == -1 and errno != EINTR){
2010
perror_plus("nanosleep");
2011
}
2012
}
2013
if(not take_down_interface){
2014
/* We won't need the socket anymore */
2015
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2016
if(ret == -1){
2017
perror_plus("close");
2018
}
2019
}
2020
#ifdef __linux__
2021
if(restore_loglevel){
2022
/* Restores kernel loglevel to default */
2023
ret = klogctl(7, NULL, 0);
2024
if(ret == -1){
2025
perror_plus("klogctl");
2026
}
2027
}
2028
#endif /* __linux__ */
2029
/* Lower privileges */
2030
errno = 0;
2031
/* Lower privileges */
2032
ret = seteuid(uid);
2033
if(ret == -1){
2034
perror_plus("seteuid");
2035
}
2652
bool interface_was_up = interface_is_up(interface);
2653
errno = bring_up_interface(interface, delay);
2654
if(not interface_was_up){
2655
if(errno != 0){
2656
perror_plus("Failed to bring up interface");
2657
} else {
2658
errno = argz_add(&interfaces_to_take_down,
2659
&interfaces_to_take_down_size,
2660
interface);
2661
if(errno != 0){
2662
perror_plus("argz_add");
2663
}
2664
}
2665
}
2666
}
2667
if(debug and (interfaces_to_take_down == NULL)){
2668
fprintf_plus(stderr, "No interfaces were brought up\n");
2669
}
2670
}
2671
2672
/* If we only got one interface, explicitly use only that one */
2673
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2674
if(debug){
2675
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2676
mc.interfaces);
2677
}
2678
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2036
2679
}
2037
2680
2038
2681
if(quit_now){
2039
2682
goto end;
2040
2683
}
2041
2684
2042
ret = init_gnutls_global(pubkey, seckey);
2685
ret = init_gnutls_global(pubkey, seckey, &mc);
2043
2686
if(ret == -1){
2044
2687
fprintf_plus(stderr, "init_gnutls_global failed\n");
2045
2688
exitcode = EX_UNAVAILABLE;
2052
2695
goto end;
2053
2696
}
2054
2697
2055
if(mkdtemp(tempdir) == NULL){
2698
/* Try /run/tmp before /tmp */
2699
tempdir = mkdtemp(run_tempdir);
2700
if(tempdir == NULL and errno == ENOENT){
2701
if(debug){
2702
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2703
run_tempdir, old_tempdir);
2704
}
2705
tempdir = mkdtemp(old_tempdir);
2706
}
2707
if(tempdir == NULL){
2056
2708
perror_plus("mkdtemp");
2057
2709
goto end;
2058
2710
}
2059
tempdir_created = true;
2060
2711
2061
2712
if(quit_now){
2062
2713
goto end;
2063
2714
}
2064
2715
2065
if(not init_gpgme(pubkey, seckey, tempdir)){
2716
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2066
2717
fprintf_plus(stderr, "init_gpgme failed\n");
2067
2718
exitcode = EX_UNAVAILABLE;
2068
2719
goto end;
2078
2729
/* Connect directly, do not use Zeroconf */
2079
2730
/* (Mainly meant for debugging) */
2080
2731
char *address = strrchr(connect_to, ':');
2732
2081
2733
if(address == NULL){
2082
2734
fprintf_plus(stderr, "No colon in address\n");
2083
2735
exitcode = EX_USAGE;
2088
2740
goto end;
2089
2741
}
2090
2742
2091
uint16_t port;
2743
in_port_t port;
2092
2744
errno = 0;
2093
2745
tmpmax = strtoimax(address+1, &tmp, 10);
2094
2746
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2095
or tmpmax != (uint16_t)tmpmax){
2747
or tmpmax != (in_port_t)tmpmax){
2096
2748
fprintf_plus(stderr, "Bad port number\n");
2097
2749
exitcode = EX_USAGE;
2098
2750
goto end;
2099
2751
}
2100
2752
2101
2753
if(quit_now){
2102
2754
goto end;
2103
2755
}
2104
2756
2105
port = (uint16_t)tmpmax;
2757
port = (in_port_t)tmpmax;
2106
2758
*address = '\0';
2107
2759
/* Colon in address indicates IPv6 */
2108
2760
int af;
2124
2776
}
2125
2777
2126
2778
while(not quit_now){
2127
ret = start_mandos_communication(address, port, if_index, af);
2779
ret = start_mandos_communication(address, port, if_index, af,
2780
&mc);
2128
2781
if(quit_now or ret == 0){
2129
2782
break;
2130
2783
}
2132
2785
fprintf_plus(stderr, "Retrying in %d seconds\n",
2133
2786
(int)retry_interval);
2134
2787
}
2135
sleep((int)retry_interval);
2788
sleep((unsigned int)retry_interval);
2136
2789
}
2137
2790
2138
if (not quit_now){
2791
if(not quit_now){
2139
2792
exitcode = EXIT_SUCCESS;
2140
2793
}
2141
2794
2156
2809
config.publish_domain = 0;
2157
2810
2158
2811
/* Allocate a new server */
2159
mc.server = avahi_server_new(avahi_simple_poll_get
2160
(mc.simple_poll), &config, NULL,
2161
NULL, &error);
2812
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2813
&config, NULL, NULL, &ret_errno);
2162
2814
2163
2815
/* Free the Avahi configuration data */
2164
2816
avahi_server_config_free(&config);
2167
2819
/* Check if creating the Avahi server object succeeded */
2168
2820
if(mc.server == NULL){
2169
2821
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
2822
avahi_strerror(ret_errno));
2171
2823
exitcode = EX_UNAVAILABLE;
2172
2824
goto end;
2173
2825
}
2179
2831
/* Create the Avahi service browser */
2180
2832
sb = avahi_s_service_browser_new(mc.server, if_index,
2181
2833
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2182
NULL, 0, browse_callback, NULL);
2834
NULL, 0, browse_callback,
2835
(void *)&mc);
2183
2836
if(sb == NULL){
2184
2837
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2185
2838
avahi_strerror(avahi_server_errno(mc.server)));
2196
2849
if(debug){
2197
2850
fprintf_plus(stderr, "Starting Avahi loop search\n");
2198
2851
}
2199
2200
ret = avahi_loop_with_timeout(mc.simple_poll,
2201
(int)(retry_interval * 1000));
2852
2853
ret = avahi_loop_with_timeout(simple_poll,
2854
(int)(retry_interval * 1000), &mc);
2202
2855
if(debug){
2203
2856
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2204
2857
(ret == 0) ? "successfully" : "with error");
2211
2864
}
2212
2865
2213
2866
/* Cleanup things */
2867
free(mc.interfaces);
2868
2214
2869
if(sb != NULL)
2215
2870
avahi_s_service_browser_free(sb);
2216
2871
2217
2872
if(mc.server != NULL)
2218
2873
avahi_server_free(mc.server);
2219
2874
2220
if(mc.simple_poll != NULL)
2221
avahi_simple_poll_free(mc.simple_poll);
2875
if(simple_poll != NULL)
2876
avahi_simple_poll_free(simple_poll);
2222
2877
2223
2878
if(gnutls_initialized){
2224
2879
gnutls_certificate_free_credentials(mc.cred);
2236
2891
mc.current_server->prev->next = NULL;
2237
2892
while(mc.current_server != NULL){
2238
2893
server *next = mc.current_server->next;
2894
#ifdef __GNUC__
2895
#pragma GCC diagnostic push
2896
#pragma GCC diagnostic ignored "-Wcast-qual"
2897
#endif
2898
free((char *)(mc.current_server->ip));
2899
#ifdef __GNUC__
2900
#pragma GCC diagnostic pop
2901
#endif
2239
2902
free(mc.current_server);
2240
2903
mc.current_server = next;
2241
2904
}
2242
2905
}
2243
2906
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2246
2247
/* Re-raise priviliges */
2907
/* Re-raise privileges */
2248
2908
{
2249
errno = 0;
2250
ret = seteuid(0);
2251
if(ret == -1){
2252
perror_plus("seteuid");
2909
ret_errno = raise_privileges();
2910
if(ret_errno != 0){
2911
errno = ret_errno;
2912
perror_plus("Failed to raise privileges");
2913
} else {
2914
2915
/* Run network hooks */
2916
run_network_hooks("stop", interfaces_hooks != NULL ?
2917
interfaces_hooks : "", delay);
2918
2919
/* Take down the network interfaces which were brought up */
2920
{
2921
char *interface = NULL;
2922
while((interface=argz_next(interfaces_to_take_down,
2923
interfaces_to_take_down_size,
2924
interface))){
2925
ret_errno = take_down_interface(interface);
2926
if(ret_errno != 0){
2927
errno = ret_errno;
2928
perror_plus("Failed to take down interface");
2929
}
2930
}
2931
if(debug and (interfaces_to_take_down == NULL)){
2932
fprintf_plus(stderr, "No interfaces needed to be taken"
2933
" down\n");
2934
}
2935
}
2253
2936
}
2254
2937
2255
/* Take down the network interface */
2256
if(take_down_interface and geteuid() == 0){
2257
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2258
if(ret == -1){
2259
perror_plus("ioctl SIOCGIFFLAGS");
2260
} else if(network.ifr_flags & IFF_UP){
2261
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2262
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2263
if(ret == -1){
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2265
}
2266
}
2267
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
if(ret == -1){
2269
perror_plus("close");
2270
}
2938
ret_errno = lower_privileges_permanently();
2939
if(ret_errno != 0){
2940
errno = ret_errno;
2941
perror_plus("Failed to lower privileges permanently");
2271
2942
}
2272
2943
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
2944
2945
free(interfaces_to_take_down);
2946
free(interfaces_hooks);
2279
2947
2280
2948
/* Removes the GPGME temp directory and all files inside */
2281
if(tempdir_created){
2949
if(tempdir != NULL){
2282
2950
struct dirent **direntries = NULL;
2283
struct dirent *direntry = NULL;
2284
int numentries = scandir(tempdir, &direntries, notdotentries,
2285
alphasort);
2286
if (numentries > 0){
2287
for(int i = 0; i < numentries; i++){
2288
direntry = direntries[i];
2289
char *fullname = NULL;
2290
ret = asprintf(&fullname, "%s/%s", tempdir,
2291
direntry->d_name);
2292
if(ret < 0){
2293
perror_plus("asprintf");
2294
continue;
2295
}
2296
ret = remove(fullname);
2297
if(ret == -1){
2298
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2299
strerror(errno));
2300
}
2301
free(fullname);
2951
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2952
| O_NOFOLLOW
2953
| O_DIRECTORY
2954
| O_PATH));
2955
if(tempdir_fd == -1){
2956
perror_plus("open");
2957
} else {
2958
#ifdef __GLIBC__
2959
#if __GLIBC_PREREQ(2, 15)
2960
int numentries = scandirat(tempdir_fd, ".", &direntries,
2961
notdotentries, alphasort);
2962
#else /* not __GLIBC_PREREQ(2, 15) */
2963
int numentries = scandir(tempdir, &direntries, notdotentries,
2964
alphasort);
2965
#endif /* not __GLIBC_PREREQ(2, 15) */
2966
#else /* not __GLIBC__ */
2967
int numentries = scandir(tempdir, &direntries, notdotentries,
2968
alphasort);
2969
#endif /* not __GLIBC__ */
2970
if(numentries >= 0){
2971
for(int i = 0; i < numentries; i++){
2972
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2973
if(ret == -1){
2974
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2975
" \"%s\", 0): %s\n", tempdir,
2976
direntries[i]->d_name, strerror(errno));
2977
}
2978
free(direntries[i]);
2979
}
2980
2981
/* need to clean even if 0 because man page doesn't specify */
2982
free(direntries);
2983
if(numentries == -1){
2984
perror_plus("scandir");
2985
}
2986
ret = rmdir(tempdir);
2987
if(ret == -1 and errno != ENOENT){
2988
perror_plus("rmdir");
2989
}
2302
2990
}
2303
}
2304
2305
/* need to clean even if 0 because man page doesn't specify */
2306
free(direntries);
2307
if (numentries == -1){
2308
perror_plus("scandir");
2309
}
2310
ret = rmdir(tempdir);
2311
if(ret == -1 and errno != ENOENT){
2312
perror_plus("rmdir");
2991
TEMP_FAILURE_RETRY(close(tempdir_fd));
2313
2992
}
2314
2993
}
2315
2994
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0