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- Committer: Teddy Hogeborn
- Date: 2016-02-28 20:34:59 UTC
- Revision ID: teddy@recompile.se-20160228203459-81vtqvr96yukyrok
Client: Remove calls to gnutls_global_init and gnutls_global_deinit
* plugins.d/mandos-client.c (init_gnutls_global, main): Don't call
gnutls_global_init or gnutls_global_deinit anymore; these are
unnecessary in GnuTLS 3.3.
* plugins.d/mandos-client.c (init_gnutls_global, main): Don't call
gnutls_global_init or gnutls_global_deinit anymore; these are
unnecessary in GnuTLS 3.3.
- files added:
- 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 © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 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(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
78
79
#include <iso646.h> /* not, or, and */
79
80
#include <argp.h> /* struct argp_option, error_t, struct
80
81
argp_state, struct argp,
92
93
argz_delete(), argz_append(),
93
94
argz_stringify(), argz_add(),
94
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
95
98
96
99
#ifdef __linux__
97
100
#include <sys/klog.h> /* klogctl() */
139
142
static const char sys_class_net[] = "/sys/class/net";
140
143
char *connect_to = NULL;
141
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
142
146
uid_t uid = 65534;
143
147
gid_t gid = 65534;
144
148
145
149
/* Doubly linked list that need to be circularly linked when used */
146
150
typedef struct server{
147
151
const char *ip;
148
uint16_t port;
152
in_port_t port;
149
153
AvahiIfIndex if_index;
150
154
int af;
151
155
struct timespec last_seen;
155
159
156
160
/* Used for passing in values through the Avahi callback functions */
157
161
typedef struct {
158
AvahiSimplePoll *simple_poll;
159
162
AvahiServer *server;
160
163
gnutls_certificate_credentials_t cred;
161
164
unsigned int dh_bits;
163
166
const char *priority;
164
167
gpgme_ctx_t ctx;
165
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
166
171
} mandos_context;
167
172
168
/* global context so signal handler can reach it*/
169
mandos_context mc = { .simple_poll = NULL, .server = NULL,
170
.dh_bits = 1024, .priority = "SECURE256"
171
":!CTYPE-X.509:+CTYPE-OPENPGP",
172
.current_server = NULL };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
173
175
174
176
sig_atomic_t quit_now = 0;
175
177
int signal_received = 0;
183
185
perror(print_text);
184
186
}
185
187
186
__attribute__((format (gnu_printf, 2, 3)))
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
189
int fprintf_plus(FILE *stream, const char *format, ...){
188
190
va_list ap;
189
191
va_start (ap, format);
190
192
191
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
194
program_invocation_short_name));
193
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
196
}
195
197
196
198
/*
198
200
* bytes. "buffer_capacity" is how much is currently allocated,
199
201
* "buffer_length" is how much is already used.
200
202
*/
203
__attribute__((nonnull, warn_unused_result))
201
204
size_t incbuffer(char **buffer, size_t buffer_length,
202
205
size_t buffer_capacity){
203
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
204
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
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;
206
213
return 0;
207
214
}
215
*buffer = new_buf;
208
216
buffer_capacity += BUFFER_SIZE;
209
217
}
210
218
return buffer_capacity;
211
219
}
212
220
213
221
/* Add server to set of servers to retry periodically */
214
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
215
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){
216
225
int ret;
217
226
server *new_server = malloc(sizeof(server));
218
227
if(new_server == NULL){
225
234
.af = af };
226
235
if(new_server->ip == NULL){
227
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);
228
252
return false;
229
253
}
230
254
/* Special case of first server */
231
if (mc.current_server == NULL){
255
if(*current_server == NULL){
232
256
new_server->next = new_server;
233
257
new_server->prev = new_server;
234
mc.current_server = new_server;
235
/* Place the new server last in the list */
258
*current_server = new_server;
236
259
} else {
237
new_server->next = mc.current_server;
238
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;
239
263
new_server->prev->next = new_server;
240
mc.current_server->prev = new_server;
241
}
242
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
243
if(ret == -1){
244
perror_plus("clock_gettime");
245
return false;
264
(*current_server)->prev = new_server;
246
265
}
247
266
return true;
248
267
}
250
269
/*
251
270
* Initialize GPGME.
252
271
*/
253
static bool init_gpgme(const char *seckey, const char *pubkey,
254
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){
255
277
gpgme_error_t rc;
256
278
gpgme_engine_info_t engine_info;
257
279
258
259
280
/*
260
281
* Helper function to insert pub and seckey to the engine keyring.
261
282
*/
262
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
263
284
int ret;
264
285
int fd;
265
286
gpgme_data_t pgp_data;
277
298
return false;
278
299
}
279
300
280
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
281
302
if(rc != GPG_ERR_NO_ERROR){
282
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
283
304
gpgme_strsource(rc), gpgme_strerror(rc));
284
305
return false;
285
306
}
286
307
287
ret = (int)TEMP_FAILURE_RETRY(close(fd));
308
ret = close(fd);
288
309
if(ret == -1){
289
310
perror_plus("close");
290
311
}
327
348
}
328
349
329
350
/* Create new GPGME "context" */
330
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
331
352
if(rc != GPG_ERR_NO_ERROR){
332
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
333
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
346
367
* Decrypt OpenPGP data.
347
368
* Returns -1 on error
348
369
*/
370
__attribute__((nonnull, warn_unused_result))
349
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
350
372
size_t crypto_size,
351
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
352
375
gpgme_data_t dh_crypto, dh_plain;
353
376
gpgme_error_t rc;
354
377
ssize_t ret;
380
403
381
404
/* Decrypt data from the cryptotext data buffer to the plaintext
382
405
data buffer */
383
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
384
407
if(rc != GPG_ERR_NO_ERROR){
385
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
386
409
gpgme_strsource(rc), gpgme_strerror(rc));
387
410
plaintext_length = -1;
388
411
if(debug){
389
412
gpgme_decrypt_result_t result;
390
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
391
414
if(result == NULL){
392
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
393
416
} else {
470
493
return plaintext_length;
471
494
}
472
495
473
static const char * safer_gnutls_strerror(int value){
474
const char *ret = gnutls_strerror(value); /* Spurious warning from
475
-Wunreachable-code */
476
if(ret == NULL)
477
ret = "(unknown)";
478
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);
479
507
}
480
508
481
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
482
511
static void debuggnutls(__attribute__((unused)) int level,
483
512
const char* string){
484
513
fprintf_plus(stderr, "GnuTLS: %s", string);
485
514
}
486
515
516
__attribute__((nonnull(1, 2, 4), warn_unused_result))
487
517
static int init_gnutls_global(const char *pubkeyfilename,
488
const char *seckeyfilename){
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
489
521
int ret;
522
unsigned int uret;
490
523
491
524
if(debug){
492
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
493
526
}
494
527
495
ret = gnutls_global_init();
496
if(ret != GNUTLS_E_SUCCESS){
497
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
498
safer_gnutls_strerror(ret));
499
return -1;
500
}
501
502
528
if(debug){
503
529
/* "Use a log level over 10 to enable all debugging options."
504
530
* - GnuTLS manual
508
534
}
509
535
510
536
/* OpenPGP credentials */
511
ret = gnutls_certificate_allocate_credentials(&mc.cred);
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
512
538
if(ret != GNUTLS_E_SUCCESS){
513
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
514
540
safer_gnutls_strerror(ret));
515
gnutls_global_deinit();
516
541
return -1;
517
542
}
518
543
524
549
}
525
550
526
551
ret = gnutls_certificate_set_openpgp_key_file
527
(mc.cred, pubkeyfilename, seckeyfilename,
552
(mc->cred, pubkeyfilename, seckeyfilename,
528
553
GNUTLS_OPENPGP_FMT_BASE64);
529
554
if(ret != GNUTLS_E_SUCCESS){
530
555
fprintf_plus(stderr,
536
561
}
537
562
538
563
/* GnuTLS server initialization */
539
ret = gnutls_dh_params_init(&mc.dh_params);
564
ret = gnutls_dh_params_init(&mc->dh_params);
540
565
if(ret != GNUTLS_E_SUCCESS){
541
566
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
542
567
" initialization: %s\n",
543
568
safer_gnutls_strerror(ret));
544
569
goto globalfail;
545
570
}
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
547
if(ret != GNUTLS_E_SUCCESS){
548
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
550
goto globalfail;
551
}
552
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
571
/* If a Diffie-Hellman parameters file was given, try to use it */
572
if(dhparamsfilename != NULL){
573
gnutls_datum_t params = { .data = NULL, .size = 0 };
574
do {
575
int dhpfile = open(dhparamsfilename, O_RDONLY);
576
if(dhpfile == -1){
577
perror_plus("open");
578
dhparamsfilename = NULL;
579
break;
580
}
581
size_t params_capacity = 0;
582
while(true){
583
params_capacity = incbuffer((char **)¶ms.data,
584
(size_t)params.size,
585
(size_t)params_capacity);
586
if(params_capacity == 0){
587
perror_plus("incbuffer");
588
free(params.data);
589
params.data = NULL;
590
dhparamsfilename = NULL;
591
break;
592
}
593
ssize_t bytes_read = read(dhpfile,
594
params.data + params.size,
595
BUFFER_SIZE);
596
/* EOF */
597
if(bytes_read == 0){
598
break;
599
}
600
/* check bytes_read for failure */
601
if(bytes_read < 0){
602
perror_plus("read");
603
free(params.data);
604
params.data = NULL;
605
dhparamsfilename = NULL;
606
break;
607
}
608
params.size += (unsigned int)bytes_read;
609
}
610
if(params.data == NULL){
611
dhparamsfilename = NULL;
612
}
613
if(dhparamsfilename == NULL){
614
break;
615
}
616
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
617
GNUTLS_X509_FMT_PEM);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Failed to parse DH parameters in file"
620
" \"%s\": %s\n", dhparamsfilename,
621
safer_gnutls_strerror(ret));
622
dhparamsfilename = NULL;
623
}
624
} while(false);
625
}
626
if(dhparamsfilename == NULL){
627
if(mc->dh_bits == 0){
628
/* Find out the optimal number of DH bits */
629
/* Try to read the private key file */
630
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
631
do {
632
int secfile = open(seckeyfilename, O_RDONLY);
633
if(secfile == -1){
634
perror_plus("open");
635
break;
636
}
637
size_t buffer_capacity = 0;
638
while(true){
639
buffer_capacity = incbuffer((char **)&buffer.data,
640
(size_t)buffer.size,
641
(size_t)buffer_capacity);
642
if(buffer_capacity == 0){
643
perror_plus("incbuffer");
644
free(buffer.data);
645
buffer.data = NULL;
646
break;
647
}
648
ssize_t bytes_read = read(secfile,
649
buffer.data + buffer.size,
650
BUFFER_SIZE);
651
/* EOF */
652
if(bytes_read == 0){
653
break;
654
}
655
/* check bytes_read for failure */
656
if(bytes_read < 0){
657
perror_plus("read");
658
free(buffer.data);
659
buffer.data = NULL;
660
break;
661
}
662
buffer.size += (unsigned int)bytes_read;
663
}
664
close(secfile);
665
} while(false);
666
/* If successful, use buffer to parse private key */
667
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
668
if(buffer.data != NULL){
669
{
670
gnutls_openpgp_privkey_t privkey = NULL;
671
ret = gnutls_openpgp_privkey_init(&privkey);
672
if(ret != GNUTLS_E_SUCCESS){
673
fprintf_plus(stderr, "Error initializing OpenPGP key"
674
" structure: %s",
675
safer_gnutls_strerror(ret));
676
free(buffer.data);
677
buffer.data = NULL;
678
} else {
679
ret = gnutls_openpgp_privkey_import
680
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
681
if(ret != GNUTLS_E_SUCCESS){
682
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
683
safer_gnutls_strerror(ret));
684
privkey = NULL;
685
}
686
free(buffer.data);
687
buffer.data = NULL;
688
if(privkey != NULL){
689
/* Use private key to suggest an appropriate
690
sec_param */
691
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
692
gnutls_openpgp_privkey_deinit(privkey);
693
if(debug){
694
fprintf_plus(stderr, "This OpenPGP key implies using"
695
" a GnuTLS security parameter \"%s\".\n",
696
safe_string(gnutls_sec_param_get_name
697
(sec_param)));
698
}
699
}
700
}
701
}
702
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
703
/* Err on the side of caution */
704
sec_param = GNUTLS_SEC_PARAM_ULTRA;
705
if(debug){
706
fprintf_plus(stderr, "Falling back to security parameter"
707
" \"%s\"\n",
708
safe_string(gnutls_sec_param_get_name
709
(sec_param)));
710
}
711
}
712
}
713
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
714
if(uret != 0){
715
mc->dh_bits = uret;
716
if(debug){
717
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
718
" implies %u DH bits; using that.\n",
719
safe_string(gnutls_sec_param_get_name
720
(sec_param)),
721
mc->dh_bits);
722
}
723
} else {
724
fprintf_plus(stderr, "Failed to get implied number of DH"
725
" bits for security parameter \"%s\"): %s\n",
726
safe_string(gnutls_sec_param_get_name
727
(sec_param)),
728
safer_gnutls_strerror(ret));
729
goto globalfail;
730
}
731
} else if(debug){
732
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
733
mc->dh_bits);
734
}
735
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
736
if(ret != GNUTLS_E_SUCCESS){
737
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
738
" bits): %s\n", mc->dh_bits,
739
safer_gnutls_strerror(ret));
740
goto globalfail;
741
}
742
}
743
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
554
744
555
745
return 0;
556
746
557
747
globalfail:
558
748
559
gnutls_certificate_free_credentials(mc.cred);
560
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
749
gnutls_certificate_free_credentials(mc->cred);
750
gnutls_dh_params_deinit(mc->dh_params);
562
751
return -1;
563
752
}
564
753
565
static int init_gnutls_session(gnutls_session_t *session){
754
__attribute__((nonnull, warn_unused_result))
755
static int init_gnutls_session(gnutls_session_t *session,
756
mandos_context *mc){
566
757
int ret;
567
758
/* GnuTLS session creation */
568
759
do {
580
771
{
581
772
const char *err;
582
773
do {
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
774
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
584
775
if(quit_now){
585
776
gnutls_deinit(*session);
586
777
return -1;
597
788
598
789
do {
599
790
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
600
mc.cred);
791
mc->cred);
601
792
if(quit_now){
602
793
gnutls_deinit(*session);
603
794
return -1;
613
804
/* ignore client certificate if any. */
614
805
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
615
806
616
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
617
618
807
return 0;
619
808
}
620
809
622
811
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
623
812
__attribute__((unused)) const char *txt){}
624
813
814
/* Set effective uid to 0, return errno */
815
__attribute__((warn_unused_result))
816
error_t raise_privileges(void){
817
error_t old_errno = errno;
818
error_t ret_errno = 0;
819
if(seteuid(0) == -1){
820
ret_errno = errno;
821
}
822
errno = old_errno;
823
return ret_errno;
824
}
825
826
/* Set effective and real user ID to 0. Return errno. */
827
__attribute__((warn_unused_result))
828
error_t raise_privileges_permanently(void){
829
error_t old_errno = errno;
830
error_t ret_errno = raise_privileges();
831
if(ret_errno != 0){
832
errno = old_errno;
833
return ret_errno;
834
}
835
if(setuid(0) == -1){
836
ret_errno = errno;
837
}
838
errno = old_errno;
839
return ret_errno;
840
}
841
842
/* Set effective user ID to unprivileged saved user ID */
843
__attribute__((warn_unused_result))
844
error_t lower_privileges(void){
845
error_t old_errno = errno;
846
error_t ret_errno = 0;
847
if(seteuid(uid) == -1){
848
ret_errno = errno;
849
}
850
errno = old_errno;
851
return ret_errno;
852
}
853
854
/* Lower privileges permanently */
855
__attribute__((warn_unused_result))
856
error_t lower_privileges_permanently(void){
857
error_t old_errno = errno;
858
error_t ret_errno = 0;
859
if(setuid(uid) == -1){
860
ret_errno = errno;
861
}
862
errno = old_errno;
863
return ret_errno;
864
}
865
866
/* Helper function to add_local_route() and delete_local_route() */
867
__attribute__((nonnull, warn_unused_result))
868
static bool add_delete_local_route(const bool add,
869
const char *address,
870
AvahiIfIndex if_index){
871
int ret;
872
char helper[] = "mandos-client-iprouteadddel";
873
char add_arg[] = "add";
874
char delete_arg[] = "delete";
875
char debug_flag[] = "--debug";
876
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
877
if(pluginhelperdir == NULL){
878
if(debug){
879
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
880
" variable not set; cannot run helper\n");
881
}
882
return false;
883
}
884
885
char interface[IF_NAMESIZE];
886
if(if_indextoname((unsigned int)if_index, interface) == NULL){
887
perror_plus("if_indextoname");
888
return false;
889
}
890
891
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
892
if(devnull == -1){
893
perror_plus("open(\"/dev/null\", O_RDONLY)");
894
return false;
895
}
896
pid_t pid = fork();
897
if(pid == 0){
898
/* Child */
899
/* Raise privileges */
900
errno = raise_privileges_permanently();
901
if(errno != 0){
902
perror_plus("Failed to raise privileges");
903
/* _exit(EX_NOPERM); */
904
} else {
905
/* Set group */
906
errno = 0;
907
ret = setgid(0);
908
if(ret == -1){
909
perror_plus("setgid");
910
_exit(EX_NOPERM);
911
}
912
/* Reset supplementary groups */
913
errno = 0;
914
ret = setgroups(0, NULL);
915
if(ret == -1){
916
perror_plus("setgroups");
917
_exit(EX_NOPERM);
918
}
919
}
920
ret = dup2(devnull, STDIN_FILENO);
921
if(ret == -1){
922
perror_plus("dup2(devnull, STDIN_FILENO)");
923
_exit(EX_OSERR);
924
}
925
ret = close(devnull);
926
if(ret == -1){
927
perror_plus("close");
928
_exit(EX_OSERR);
929
}
930
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
931
if(ret == -1){
932
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
933
_exit(EX_OSERR);
934
}
935
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
936
O_RDONLY
937
| O_DIRECTORY
938
| O_PATH
939
| O_CLOEXEC));
940
if(helperdir_fd == -1){
941
perror_plus("open");
942
_exit(EX_UNAVAILABLE);
943
}
944
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
945
helper, O_RDONLY));
946
if(helper_fd == -1){
947
perror_plus("openat");
948
close(helperdir_fd);
949
_exit(EX_UNAVAILABLE);
950
}
951
close(helperdir_fd);
952
#ifdef __GNUC__
953
#pragma GCC diagnostic push
954
#pragma GCC diagnostic ignored "-Wcast-qual"
955
#endif
956
if(fexecve(helper_fd, (char *const [])
957
{ helper, add ? add_arg : delete_arg, (char *)address,
958
interface, debug ? debug_flag : NULL, NULL },
959
environ) == -1){
960
#ifdef __GNUC__
961
#pragma GCC diagnostic pop
962
#endif
963
perror_plus("fexecve");
964
_exit(EXIT_FAILURE);
965
}
966
}
967
if(pid == -1){
968
perror_plus("fork");
969
return false;
970
}
971
int status;
972
pid_t pret = -1;
973
errno = 0;
974
do {
975
pret = waitpid(pid, &status, 0);
976
if(pret == -1 and errno == EINTR and quit_now){
977
int errno_raising = 0;
978
if((errno = raise_privileges()) != 0){
979
errno_raising = errno;
980
perror_plus("Failed to raise privileges in order to"
981
" kill helper program");
982
}
983
if(kill(pid, SIGTERM) == -1){
984
perror_plus("kill");
985
}
986
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
987
perror_plus("Failed to lower privileges after killing"
988
" helper program");
989
}
990
return false;
991
}
992
} while(pret == -1 and errno == EINTR);
993
if(pret == -1){
994
perror_plus("waitpid");
995
return false;
996
}
997
if(WIFEXITED(status)){
998
if(WEXITSTATUS(status) != 0){
999
fprintf_plus(stderr, "Error: iprouteadddel exited"
1000
" with status %d\n", WEXITSTATUS(status));
1001
return false;
1002
}
1003
return true;
1004
}
1005
if(WIFSIGNALED(status)){
1006
fprintf_plus(stderr, "Error: iprouteadddel died by"
1007
" signal %d\n", WTERMSIG(status));
1008
return false;
1009
}
1010
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1011
return false;
1012
}
1013
1014
__attribute__((nonnull, warn_unused_result))
1015
static bool add_local_route(const char *address,
1016
AvahiIfIndex if_index){
1017
if(debug){
1018
fprintf_plus(stderr, "Adding route to %s\n", address);
1019
}
1020
return add_delete_local_route(true, address, if_index);
1021
}
1022
1023
__attribute__((nonnull, warn_unused_result))
1024
static bool delete_local_route(const char *address,
1025
AvahiIfIndex if_index){
1026
if(debug){
1027
fprintf_plus(stderr, "Removing route to %s\n", address);
1028
}
1029
return add_delete_local_route(false, address, if_index);
1030
}
1031
625
1032
/* Called when a Mandos server is found */
626
static int start_mandos_communication(const char *ip, uint16_t port,
1033
__attribute__((nonnull, warn_unused_result))
1034
static int start_mandos_communication(const char *ip, in_port_t port,
627
1035
AvahiIfIndex if_index,
628
int af){
1036
int af, mandos_context *mc){
629
1037
int ret, tcp_sd = -1;
630
1038
ssize_t sret;
631
union {
632
struct sockaddr_in in;
633
struct sockaddr_in6 in6;
634
} to;
1039
struct sockaddr_storage to;
635
1040
char *buffer = NULL;
636
1041
char *decrypted_buffer = NULL;
637
1042
size_t buffer_length = 0;
640
1045
int retval = -1;
641
1046
gnutls_session_t session;
642
1047
int pf; /* Protocol family */
1048
bool route_added = false;
643
1049
644
1050
errno = 0;
645
1051
661
1067
return -1;
662
1068
}
663
1069
664
ret = init_gnutls_session(&session);
1070
/* If the interface is specified and we have a list of interfaces */
1071
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1072
/* Check if the interface is one of the interfaces we are using */
1073
bool match = false;
1074
{
1075
char *interface = NULL;
1076
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1077
interface))){
1078
if(if_nametoindex(interface) == (unsigned int)if_index){
1079
match = true;
1080
break;
1081
}
1082
}
1083
}
1084
if(not match){
1085
/* This interface does not match any in the list, so we don't
1086
connect to the server */
1087
if(debug){
1088
char interface[IF_NAMESIZE];
1089
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1090
perror_plus("if_indextoname");
1091
} else {
1092
fprintf_plus(stderr, "Skipping server on non-used interface"
1093
" \"%s\"\n",
1094
if_indextoname((unsigned int)if_index,
1095
interface));
1096
}
1097
}
1098
return -1;
1099
}
1100
}
1101
1102
ret = init_gnutls_session(&session, mc);
665
1103
if(ret != 0){
666
1104
return -1;
667
1105
}
668
1106
669
1107
if(debug){
670
1108
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
671
PRIu16 "\n", ip, port);
1109
PRIuMAX "\n", ip, (uintmax_t)port);
672
1110
}
673
1111
674
tcp_sd = socket(pf, SOCK_STREAM, 0);
1112
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
675
1113
if(tcp_sd < 0){
676
1114
int e = errno;
677
1115
perror_plus("socket");
684
1122
goto mandos_end;
685
1123
}
686
1124
687
memset(&to, 0, sizeof(to));
688
1125
if(af == AF_INET6){
689
to.in6.sin6_family = (sa_family_t)af;
690
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1126
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1127
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1128
ret = inet_pton(af, ip, &to6->sin6_addr);
691
1129
} else { /* IPv4 */
692
to.in.sin_family = (sa_family_t)af;
693
ret = inet_pton(af, ip, &to.in.sin_addr);
1130
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1131
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1132
ret = inet_pton(af, ip, &to4->sin_addr);
694
1133
}
695
1134
if(ret < 0 ){
696
1135
int e = errno;
705
1144
goto mandos_end;
706
1145
}
707
1146
if(af == AF_INET6){
708
to.in6.sin6_port = htons(port); /* Spurious warnings from
709
-Wconversion and
710
-Wunreachable-code */
711
712
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
713
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
714
-Wunreachable-code*/
1147
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1148
if(IN6_IS_ADDR_LINKLOCAL
1149
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
715
1150
if(if_index == AVAHI_IF_UNSPEC){
716
1151
fprintf_plus(stderr, "An IPv6 link-local address is"
717
1152
" incomplete without a network interface\n");
719
1154
goto mandos_end;
720
1155
}
721
1156
/* Set the network interface number as scope */
722
to.in6.sin6_scope_id = (uint32_t)if_index;
1157
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
723
1158
}
724
1159
} else {
725
to.in.sin_port = htons(port); /* Spurious warnings from
726
-Wconversion and
727
-Wunreachable-code */
1160
((struct sockaddr_in *)&to)->sin_port = htons(port);
728
1161
}
729
1162
730
1163
if(quit_now){
738
1171
if(if_indextoname((unsigned int)if_index, interface) == NULL){
739
1172
perror_plus("if_indextoname");
740
1173
} else {
741
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
742
"\n", ip, interface, port);
1174
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1175
"\n", ip, interface, (uintmax_t)port);
743
1176
}
744
1177
} else {
745
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
746
ip, port);
1178
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1179
ip, (uintmax_t)port);
747
1180
}
748
1181
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
749
1182
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
750
const char *pcret;
751
if(af == AF_INET6){
752
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
753
sizeof(addrstr));
754
} else {
755
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
756
sizeof(addrstr));
757
}
758
if(pcret == NULL){
759
perror_plus("inet_ntop");
760
} else {
761
if(strcmp(addrstr, ip) != 0){
762
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
763
}
764
}
765
}
766
767
if(quit_now){
768
errno = EINTR;
769
goto mandos_end;
770
}
771
772
if(af == AF_INET6){
773
ret = connect(tcp_sd, &to.in6, sizeof(to));
774
} else {
775
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
776
}
777
if(ret < 0){
778
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
779
int e = errno;
780
perror_plus("connect");
781
errno = e;
782
}
783
goto mandos_end;
784
}
785
786
if(quit_now){
787
errno = EINTR;
788
goto mandos_end;
1183
if(af == AF_INET6){
1184
ret = getnameinfo((struct sockaddr *)&to,
1185
sizeof(struct sockaddr_in6),
1186
addrstr, sizeof(addrstr), NULL, 0,
1187
NI_NUMERICHOST);
1188
} else {
1189
ret = getnameinfo((struct sockaddr *)&to,
1190
sizeof(struct sockaddr_in),
1191
addrstr, sizeof(addrstr), NULL, 0,
1192
NI_NUMERICHOST);
1193
}
1194
if(ret == EAI_SYSTEM){
1195
perror_plus("getnameinfo");
1196
} else if(ret != 0) {
1197
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1198
} else if(strcmp(addrstr, ip) != 0){
1199
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1200
}
1201
}
1202
1203
if(quit_now){
1204
errno = EINTR;
1205
goto mandos_end;
1206
}
1207
1208
while(true){
1209
if(af == AF_INET6){
1210
ret = connect(tcp_sd, (struct sockaddr *)&to,
1211
sizeof(struct sockaddr_in6));
1212
} else {
1213
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1214
sizeof(struct sockaddr_in));
1215
}
1216
if(ret < 0){
1217
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1218
and if_index != AVAHI_IF_UNSPEC
1219
and connect_to == NULL
1220
and not route_added and
1221
((af == AF_INET6 and not
1222
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1223
&to)->sin6_addr)))
1224
or (af == AF_INET and
1225
/* Not a a IPv4LL address */
1226
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1227
& 0xFFFF0000L) != 0xA9FE0000L))){
1228
/* Work around Avahi bug - Avahi does not announce link-local
1229
addresses if it has a global address, so local hosts with
1230
*only* a link-local address (e.g. Mandos clients) cannot
1231
connect to a Mandos server announced by Avahi on a server
1232
host with a global address. Work around this by retrying
1233
with an explicit route added with the server's address.
1234
1235
Avahi bug reference:
1236
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1237
https://bugs.debian.org/587961
1238
*/
1239
if(debug){
1240
fprintf_plus(stderr, "Mandos server unreachable, trying"
1241
" direct route\n");
1242
}
1243
int e = errno;
1244
route_added = add_local_route(ip, if_index);
1245
if(route_added){
1246
continue;
1247
}
1248
errno = e;
1249
}
1250
if(errno != ECONNREFUSED or debug){
1251
int e = errno;
1252
perror_plus("connect");
1253
errno = e;
1254
}
1255
goto mandos_end;
1256
}
1257
1258
if(quit_now){
1259
errno = EINTR;
1260
goto mandos_end;
1261
}
1262
break;
789
1263
}
790
1264
791
1265
const char *out = mandos_protocol_version;
942
1416
if(buffer_length > 0){
943
1417
ssize_t decrypted_buffer_size;
944
1418
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
945
&decrypted_buffer);
1419
&decrypted_buffer, mc);
946
1420
if(decrypted_buffer_size >= 0){
947
1421
948
1422
written = 0;
974
1448
975
1449
mandos_end:
976
1450
{
1451
if(route_added){
1452
if(not delete_local_route(ip, if_index)){
1453
fprintf_plus(stderr, "Failed to delete local route to %s on"
1454
" interface %d", ip, if_index);
1455
}
1456
}
977
1457
int e = errno;
978
1458
free(decrypted_buffer);
979
1459
free(buffer);
980
1460
if(tcp_sd >= 0){
981
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1461
ret = close(tcp_sd);
982
1462
}
983
1463
if(ret == -1){
984
1464
if(e == 0){
996
1476
return retval;
997
1477
}
998
1478
1479
__attribute__((nonnull))
999
1480
static void resolve_callback(AvahiSServiceResolver *r,
1000
1481
AvahiIfIndex interface,
1001
1482
AvahiProtocol proto,
1009
1490
AVAHI_GCC_UNUSED AvahiStringList *txt,
1010
1491
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1011
1492
flags,
1012
AVAHI_GCC_UNUSED void* userdata){
1013
assert(r);
1493
void *mc){
1494
if(r == NULL){
1495
return;
1496
}
1014
1497
1015
1498
/* Called whenever a service has been resolved successfully or
1016
1499
timed out */
1017
1500
1018
1501
if(quit_now){
1502
avahi_s_service_resolver_free(r);
1019
1503
return;
1020
1504
}
1021
1505
1025
1509
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1026
1510
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1027
1511
domain,
1028
avahi_strerror(avahi_server_errno(mc.server)));
1512
avahi_strerror(avahi_server_errno
1513
(((mandos_context*)mc)->server)));
1029
1514
break;
1030
1515
1031
1516
case AVAHI_RESOLVER_FOUND:
1037
1522
PRIdMAX ") on port %" PRIu16 "\n", name,
1038
1523
host_name, ip, (intmax_t)interface, port);
1039
1524
}
1040
int ret = start_mandos_communication(ip, port, interface,
1041
avahi_proto_to_af(proto));
1525
int ret = start_mandos_communication(ip, (in_port_t)port,
1526
interface,
1527
avahi_proto_to_af(proto),
1528
mc);
1042
1529
if(ret == 0){
1043
avahi_simple_poll_quit(mc.simple_poll);
1530
avahi_simple_poll_quit(simple_poll);
1044
1531
} else {
1045
if(not add_server(ip, port, interface,
1046
avahi_proto_to_af(proto))){
1532
if(not add_server(ip, (in_port_t)port, interface,
1533
avahi_proto_to_af(proto),
1534
&((mandos_context*)mc)->current_server)){
1047
1535
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1048
1536
" list\n", name);
1049
1537
}
1062
1550
const char *domain,
1063
1551
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1064
1552
flags,
1065
AVAHI_GCC_UNUSED void* userdata){
1066
assert(b);
1553
void *mc){
1554
if(b == NULL){
1555
return;
1556
}
1067
1557
1068
1558
/* Called whenever a new services becomes available on the LAN or
1069
1559
is removed from the LAN */
1077
1567
case AVAHI_BROWSER_FAILURE:
1078
1568
1079
1569
fprintf_plus(stderr, "(Avahi browser) %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
1081
avahi_simple_poll_quit(mc.simple_poll);
1570
avahi_strerror(avahi_server_errno
1571
(((mandos_context*)mc)->server)));
1572
avahi_simple_poll_quit(simple_poll);
1082
1573
return;
1083
1574
1084
1575
case AVAHI_BROWSER_NEW:
1087
1578
the callback function is called the Avahi server will free the
1088
1579
resolver for us. */
1089
1580
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
name, type, domain, protocol, 0,
1092
resolve_callback, NULL) == NULL)
1581
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1582
interface, protocol, name, type,
1583
domain, protocol, 0,
1584
resolve_callback, mc) == NULL)
1093
1585
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1094
1586
" %s\n", name,
1095
avahi_strerror(avahi_server_errno(mc.server)));
1587
avahi_strerror(avahi_server_errno
1588
(((mandos_context*)mc)->server)));
1096
1589
break;
1097
1590
1098
1591
case AVAHI_BROWSER_REMOVE:
1117
1610
signal_received = sig;
1118
1611
int old_errno = errno;
1119
1612
/* set main loop to exit */
1120
if(mc.simple_poll != NULL){
1121
avahi_simple_poll_quit(mc.simple_poll);
1613
if(simple_poll != NULL){
1614
avahi_simple_poll_quit(simple_poll);
1122
1615
}
1123
1616
errno = old_errno;
1124
1617
}
1125
1618
1619
__attribute__((nonnull, warn_unused_result))
1126
1620
bool get_flags(const char *ifname, struct ifreq *ifr){
1127
1621
int ret;
1128
1622
error_t ret_errno;
1134
1628
errno = ret_errno;
1135
1629
return false;
1136
1630
}
1137
strcpy(ifr->ifr_name, ifname);
1631
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1632
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1138
1633
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1139
1634
if(ret == -1){
1140
1635
if(debug){
1147
1642
return true;
1148
1643
}
1149
1644
1645
__attribute__((nonnull, warn_unused_result))
1150
1646
bool good_flags(const char *ifname, const struct ifreq *ifr){
1151
1647
1152
1648
/* Reject the loopback device */
1194
1690
* corresponds to an acceptable network device.
1195
1691
* (This function is passed to scandir(3) as a filter function.)
1196
1692
*/
1693
__attribute__((nonnull, warn_unused_result))
1197
1694
int good_interface(const struct dirent *if_entry){
1198
1695
if(if_entry->d_name[0] == '.'){
1199
1696
return 0;
1217
1714
/*
1218
1715
* This function determines if a network interface is up.
1219
1716
*/
1717
__attribute__((nonnull, warn_unused_result))
1220
1718
bool interface_is_up(const char *interface){
1221
1719
struct ifreq ifr;
1222
1720
if(not get_flags(interface, &ifr)){
1233
1731
/*
1234
1732
* This function determines if a network interface is running
1235
1733
*/
1734
__attribute__((nonnull, warn_unused_result))
1236
1735
bool interface_is_running(const char *interface){
1237
1736
struct ifreq ifr;
1238
1737
if(not get_flags(interface, &ifr)){
1246
1745
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1247
1746
}
1248
1747
1748
__attribute__((nonnull, pure, warn_unused_result))
1249
1749
int notdotentries(const struct dirent *direntry){
1250
1750
/* Skip "." and ".." */
1251
1751
if(direntry->d_name[0] == '.'
1258
1758
}
1259
1759
1260
1760
/* Is this directory entry a runnable program? */
1761
__attribute__((nonnull, warn_unused_result))
1261
1762
int runnable_hook(const struct dirent *direntry){
1262
1763
int ret;
1263
1764
size_t sret;
1271
1772
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
1773
"abcdefghijklmnopqrstuvwxyz"
1273
1774
"0123456789"
1274
"_-");
1775
"_.-");
1275
1776
if((direntry->d_name)[sret] != '\0'){
1276
1777
/* Contains non-allowed characters */
1277
1778
if(debug){
1281
1782
return 0;
1282
1783
}
1283
1784
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);
1785
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1292
1786
if(ret == -1){
1293
1787
if(debug){
1294
1788
perror_plus("Could not stat hook");
1318
1812
return 1;
1319
1813
}
1320
1814
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1815
__attribute__((nonnull, warn_unused_result))
1816
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1817
mandos_context *mc){
1322
1818
int ret;
1323
1819
struct timespec now;
1324
1820
struct timespec waited_time;
1325
1821
intmax_t block_time;
1326
1822
1327
1823
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1824
if(mc->current_server == NULL){
1825
if(debug){
1330
1826
fprintf_plus(stderr, "Wait until first server is found."
1331
1827
" No timeout!\n");
1332
1828
}
1333
1829
ret = avahi_simple_poll_iterate(s, -1);
1334
1830
} else {
1335
if (debug){
1831
if(debug){
1336
1832
fprintf_plus(stderr, "Check current_server if we should run"
1337
1833
" it, or wait\n");
1338
1834
}
1345
1841
/* Calculating in ms how long time between now and server
1346
1842
who we visted longest time ago. Now - last seen. */
1347
1843
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1844
- mc->current_server->last_seen.tv_sec);
1349
1845
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1846
- mc->current_server->last_seen.tv_nsec);
1351
1847
/* total time is 10s/10,000ms.
1352
1848
Converting to s from ms by dividing by 1,000,
1353
1849
and ns to ms by dividing by 1,000,000. */
1355
1851
- ((intmax_t)waited_time.tv_sec * 1000))
1356
1852
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1853
1358
if (debug){
1854
if(debug){
1359
1855
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
1856
block_time);
1361
1857
}
1362
1858
1363
1859
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);
1860
ret = start_mandos_communication(mc->current_server->ip,
1861
mc->current_server->port,
1862
mc->current_server->if_index,
1863
mc->current_server->af, mc);
1368
1864
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1865
avahi_simple_poll_quit(s);
1370
1866
return 0;
1371
1867
}
1372
1868
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1869
&mc->current_server->last_seen);
1374
1870
if(ret == -1){
1375
1871
perror_plus("clock_gettime");
1376
1872
return -1;
1377
1873
}
1378
mc.current_server = mc.current_server->next;
1874
mc->current_server = mc->current_server->next;
1379
1875
block_time = 0; /* Call avahi to find new Mandos
1380
1876
servers, but don't block */
1381
1877
}
1383
1879
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
1880
}
1385
1881
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1882
if(ret > 0 or errno != EINTR){
1387
1883
return (ret != 1) ? ret : 0;
1388
1884
}
1389
1885
}
1390
1886
}
1391
1887
}
1392
1888
1393
/* Set effective uid to 0, return errno */
1394
error_t raise_privileges(void){
1395
error_t old_errno = errno;
1396
error_t ret_errno = 0;
1397
if(seteuid(0) == -1){
1398
ret_errno = errno;
1399
perror_plus("seteuid");
1400
}
1401
errno = old_errno;
1402
return ret_errno;
1403
}
1404
1405
/* Set effective and real user ID to 0. Return errno. */
1406
error_t raise_privileges_permanently(void){
1407
error_t old_errno = errno;
1408
error_t ret_errno = raise_privileges();
1409
if(ret_errno != 0){
1410
errno = old_errno;
1411
return ret_errno;
1412
}
1413
if(setuid(0) == -1){
1414
ret_errno = errno;
1415
perror_plus("seteuid");
1416
}
1417
errno = old_errno;
1418
return ret_errno;
1419
}
1420
1421
/* Set effective user ID to unprivileged saved user ID */
1422
error_t lower_privileges(void){
1423
error_t old_errno = errno;
1424
error_t ret_errno = 0;
1425
if(seteuid(uid) == -1){
1426
ret_errno = errno;
1427
perror_plus("seteuid");
1428
}
1429
errno = old_errno;
1430
return ret_errno;
1431
}
1432
1433
/* Lower privileges permanently */
1434
error_t lower_privileges_permanently(void){
1435
error_t old_errno = errno;
1436
error_t ret_errno = 0;
1437
if(setuid(uid) == -1){
1438
ret_errno = errno;
1439
perror_plus("setuid");
1440
}
1441
errno = old_errno;
1442
return ret_errno;
1443
}
1444
1445
bool run_network_hooks(const char *mode, const char *interface,
1889
__attribute__((nonnull))
1890
void run_network_hooks(const char *mode, const char *interface,
1446
1891
const float delay){
1447
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1892
struct dirent **direntries = NULL;
1893
if(hookdir_fd == -1){
1894
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1895
| O_CLOEXEC);
1896
if(hookdir_fd == -1){
1897
if(errno == ENOENT){
1898
if(debug){
1899
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1900
" found\n", hookdir);
1901
}
1902
} else {
1903
perror_plus("open");
1904
}
1905
return;
1906
}
1907
}
1908
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1909
runnable_hook, alphasort);
1452
1910
if(numhooks == -1){
1453
1911
perror_plus("scandir");
1454
} else {
1455
int devnull = open("/dev/null", O_RDONLY);
1456
for(int i = 0; i < numhooks; i++){
1457
direntry = direntries[i];
1458
char *fullname = NULL;
1459
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1460
if(ret < 0){
1912
return;
1913
}
1914
struct dirent *direntry;
1915
int ret;
1916
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1917
if(devnull == -1){
1918
perror_plus("open(\"/dev/null\", O_RDONLY)");
1919
return;
1920
}
1921
for(int i = 0; i < numhooks; i++){
1922
direntry = direntries[i];
1923
if(debug){
1924
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1925
direntry->d_name);
1926
}
1927
pid_t hook_pid = fork();
1928
if(hook_pid == 0){
1929
/* Child */
1930
/* Raise privileges */
1931
errno = raise_privileges_permanently();
1932
if(errno != 0){
1933
perror_plus("Failed to raise privileges");
1934
_exit(EX_NOPERM);
1935
}
1936
/* Set group */
1937
errno = 0;
1938
ret = setgid(0);
1939
if(ret == -1){
1940
perror_plus("setgid");
1941
_exit(EX_NOPERM);
1942
}
1943
/* Reset supplementary groups */
1944
errno = 0;
1945
ret = setgroups(0, NULL);
1946
if(ret == -1){
1947
perror_plus("setgroups");
1948
_exit(EX_NOPERM);
1949
}
1950
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1951
if(ret == -1){
1952
perror_plus("setenv");
1953
_exit(EX_OSERR);
1954
}
1955
ret = setenv("DEVICE", interface, 1);
1956
if(ret == -1){
1957
perror_plus("setenv");
1958
_exit(EX_OSERR);
1959
}
1960
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1961
if(ret == -1){
1962
perror_plus("setenv");
1963
_exit(EX_OSERR);
1964
}
1965
ret = setenv("MODE", mode, 1);
1966
if(ret == -1){
1967
perror_plus("setenv");
1968
_exit(EX_OSERR);
1969
}
1970
char *delaystring;
1971
ret = asprintf(&delaystring, "%f", (double)delay);
1972
if(ret == -1){
1461
1973
perror_plus("asprintf");
1462
continue;
1463
}
1464
if(debug){
1465
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1466
direntry->d_name);
1467
}
1468
pid_t hook_pid = fork();
1469
if(hook_pid == 0){
1470
/* Child */
1471
/* Raise privileges */
1472
raise_privileges_permanently();
1473
/* Set group */
1474
errno = 0;
1475
ret = setgid(0);
1476
if(ret == -1){
1477
perror_plus("setgid");
1478
}
1479
/* Reset supplementary groups */
1480
errno = 0;
1481
ret = setgroups(0, NULL);
1482
if(ret == -1){
1483
perror_plus("setgroups");
1484
}
1485
dup2(devnull, STDIN_FILENO);
1486
close(devnull);
1487
dup2(STDERR_FILENO, STDOUT_FILENO);
1488
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1489
if(ret == -1){
1490
perror_plus("setenv");
1491
_exit(EX_OSERR);
1492
}
1493
ret = setenv("DEVICE", interface, 1);
1494
if(ret == -1){
1495
perror_plus("setenv");
1496
_exit(EX_OSERR);
1497
}
1498
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1499
if(ret == -1){
1500
perror_plus("setenv");
1501
_exit(EX_OSERR);
1502
}
1503
ret = setenv("MODE", mode, 1);
1504
if(ret == -1){
1505
perror_plus("setenv");
1506
_exit(EX_OSERR);
1507
}
1508
char *delaystring;
1509
ret = asprintf(&delaystring, "%f", delay);
1510
if(ret == -1){
1511
perror_plus("asprintf");
1512
_exit(EX_OSERR);
1513
}
1514
ret = setenv("DELAY", delaystring, 1);
1515
if(ret == -1){
1516
free(delaystring);
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1974
_exit(EX_OSERR);
1975
}
1976
ret = setenv("DELAY", delaystring, 1);
1977
if(ret == -1){
1520
1978
free(delaystring);
1521
if(connect_to != NULL){
1522
ret = setenv("CONNECT", connect_to, 1);
1523
if(ret == -1){
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1527
}
1528
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1529
perror_plus("execl");
1530
_exit(EXIT_FAILURE);
1531
}
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
free(delaystring);
1983
if(connect_to != NULL){
1984
ret = setenv("CONNECT", connect_to, 1);
1985
if(ret == -1){
1986
perror_plus("setenv");
1987
_exit(EX_OSERR);
1988
}
1989
}
1990
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1991
direntry->d_name,
1992
O_RDONLY));
1993
if(hook_fd == -1){
1994
perror_plus("openat");
1995
_exit(EXIT_FAILURE);
1996
}
1997
if(close(hookdir_fd) == -1){
1998
perror_plus("close");
1999
_exit(EXIT_FAILURE);
2000
}
2001
ret = dup2(devnull, STDIN_FILENO);
2002
if(ret == -1){
2003
perror_plus("dup2(devnull, STDIN_FILENO)");
2004
_exit(EX_OSERR);
2005
}
2006
ret = close(devnull);
2007
if(ret == -1){
2008
perror_plus("close");
2009
_exit(EX_OSERR);
2010
}
2011
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2012
if(ret == -1){
2013
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2014
_exit(EX_OSERR);
2015
}
2016
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2017
environ) == -1){
2018
perror_plus("fexecve");
2019
_exit(EXIT_FAILURE);
2020
}
2021
} else {
2022
if(hook_pid == -1){
2023
perror_plus("fork");
2024
free(direntry);
2025
continue;
2026
}
2027
int status;
2028
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2029
perror_plus("waitpid");
2030
free(direntry);
2031
continue;
2032
}
2033
if(WIFEXITED(status)){
2034
if(WEXITSTATUS(status) != 0){
2035
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2036
" with status %d\n", direntry->d_name,
2037
WEXITSTATUS(status));
2038
free(direntry);
2039
continue;
2040
}
2041
} else if(WIFSIGNALED(status)){
2042
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2043
" signal %d\n", direntry->d_name,
2044
WTERMSIG(status));
2045
free(direntry);
2046
continue;
1532
2047
} else {
1533
int status;
1534
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1535
perror_plus("waitpid");
1536
free(fullname);
1537
continue;
1538
}
1539
if(WIFEXITED(status)){
1540
if(WEXITSTATUS(status) != 0){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1542
" with status %d\n", direntry->d_name,
1543
WEXITSTATUS(status));
1544
free(fullname);
1545
continue;
1546
}
1547
} else if(WIFSIGNALED(status)){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1549
" signal %d\n", direntry->d_name,
1550
WTERMSIG(status));
1551
free(fullname);
1552
continue;
1553
} else {
1554
fprintf_plus(stderr, "Warning: network hook \"%s\""
1555
" crashed\n", direntry->d_name);
1556
free(fullname);
1557
continue;
1558
}
1559
}
1560
free(fullname);
1561
if(debug){
1562
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1563
direntry->d_name);
1564
}
1565
}
1566
close(devnull);
1567
}
1568
return true;
2048
fprintf_plus(stderr, "Warning: network hook \"%s\""
2049
" crashed\n", direntry->d_name);
2050
free(direntry);
2051
continue;
2052
}
2053
}
2054
if(debug){
2055
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2056
direntry->d_name);
2057
}
2058
free(direntry);
2059
}
2060
free(direntries);
2061
if(close(hookdir_fd) == -1){
2062
perror_plus("close");
2063
} else {
2064
hookdir_fd = -1;
2065
}
2066
close(devnull);
1569
2067
}
1570
2068
2069
__attribute__((nonnull, warn_unused_result))
1571
2070
error_t bring_up_interface(const char *const interface,
1572
2071
const float delay){
1573
int sd = -1;
1574
2072
error_t old_errno = errno;
1575
error_t ret_errno = 0;
1576
int ret, ret_setflags;
2073
int ret;
1577
2074
struct ifreq network;
1578
2075
unsigned int if_index = if_nametoindex(interface);
1579
2076
if(if_index == 0){
1588
2085
}
1589
2086
1590
2087
if(not interface_is_up(interface)){
1591
if(not get_flags(interface, &network) and debug){
2088
error_t ret_errno = 0, ioctl_errno = 0;
2089
if(not get_flags(interface, &network)){
1592
2090
ret_errno = errno;
1593
2091
fprintf_plus(stderr, "Failed to get flags for interface "
1594
2092
"\"%s\"\n", interface);
2093
errno = old_errno;
1595
2094
return ret_errno;
1596
2095
}
1597
network.ifr_flags |= IFF_UP;
2096
network.ifr_flags |= IFF_UP; /* set flag */
1598
2097
1599
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1600
if(sd < 0){
2098
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2099
if(sd == -1){
1601
2100
ret_errno = errno;
1602
2101
perror_plus("socket");
1603
2102
errno = old_errno;
1604
2103
return ret_errno;
1605
2104
}
1606
2105
1607
2106
if(quit_now){
1608
close(sd);
2107
ret = close(sd);
2108
if(ret == -1){
2109
perror_plus("close");
2110
}
1609
2111
errno = old_errno;
1610
2112
return EINTR;
1611
2113
}
1615
2117
interface);
1616
2118
}
1617
2119
1618
/* Raise priviliges */
1619
raise_privileges();
2120
/* Raise privileges */
2121
ret_errno = raise_privileges();
2122
if(ret_errno != 0){
2123
errno = ret_errno;
2124
perror_plus("Failed to raise privileges");
2125
}
1620
2126
1621
2127
#ifdef __linux__
1622
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1623
messages about the network interface to mess up the prompt */
1624
int ret_linux = klogctl(8, NULL, 5);
1625
bool restore_loglevel = true;
1626
if(ret_linux == -1){
1627
restore_loglevel = false;
1628
perror_plus("klogctl");
2128
int ret_linux;
2129
bool restore_loglevel = false;
2130
if(ret_errno == 0){
2131
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2132
messages about the network interface to mess up the prompt */
2133
ret_linux = klogctl(8, NULL, 5);
2134
if(ret_linux == -1){
2135
perror_plus("klogctl");
2136
} else {
2137
restore_loglevel = true;
2138
}
1629
2139
}
1630
2140
#endif /* __linux__ */
1631
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1632
ret_errno = errno;
2141
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2142
ioctl_errno = errno;
1633
2143
#ifdef __linux__
1634
2144
if(restore_loglevel){
1635
2145
ret_linux = klogctl(7, NULL, 0);
1639
2149
}
1640
2150
#endif /* __linux__ */
1641
2151
1642
/* Lower privileges */
1643
lower_privileges();
2152
/* If raise_privileges() succeeded above */
2153
if(ret_errno == 0){
2154
/* Lower privileges */
2155
ret_errno = lower_privileges();
2156
if(ret_errno != 0){
2157
errno = ret_errno;
2158
perror_plus("Failed to lower privileges");
2159
}
2160
}
1644
2161
1645
2162
/* Close the socket */
1646
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2163
ret = close(sd);
1647
2164
if(ret == -1){
1648
2165
perror_plus("close");
1649
2166
}
1650
2167
1651
2168
if(ret_setflags == -1){
1652
errno = ret_errno;
2169
errno = ioctl_errno;
1653
2170
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1654
2171
errno = old_errno;
1655
return ret_errno;
2172
return ioctl_errno;
1656
2173
}
1657
2174
} else if(debug){
1658
2175
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1676
2193
return 0;
1677
2194
}
1678
2195
2196
__attribute__((nonnull, warn_unused_result))
1679
2197
error_t take_down_interface(const char *const interface){
1680
int sd = -1;
1681
2198
error_t old_errno = errno;
1682
error_t ret_errno = 0;
1683
int ret, ret_setflags;
1684
2199
struct ifreq network;
1685
2200
unsigned int if_index = if_nametoindex(interface);
1686
2201
if(if_index == 0){
1689
2204
return ENXIO;
1690
2205
}
1691
2206
if(interface_is_up(interface)){
2207
error_t ret_errno = 0, ioctl_errno = 0;
1692
2208
if(not get_flags(interface, &network) and debug){
1693
2209
ret_errno = errno;
1694
2210
fprintf_plus(stderr, "Failed to get flags for interface "
1695
2211
"\"%s\"\n", interface);
2212
errno = old_errno;
1696
2213
return ret_errno;
1697
2214
}
1698
2215
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1699
2216
1700
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1701
if(sd < 0){
2217
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2218
if(sd == -1){
1702
2219
ret_errno = errno;
1703
2220
perror_plus("socket");
1704
2221
errno = old_errno;
1710
2227
interface);
1711
2228
}
1712
2229
1713
/* Raise priviliges */
1714
raise_privileges();
1715
1716
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1717
ret_errno = errno;
1718
1719
/* Lower privileges */
1720
lower_privileges();
2230
/* Raise privileges */
2231
ret_errno = raise_privileges();
2232
if(ret_errno != 0){
2233
errno = ret_errno;
2234
perror_plus("Failed to raise privileges");
2235
}
2236
2237
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2238
ioctl_errno = errno;
2239
2240
/* If raise_privileges() succeeded above */
2241
if(ret_errno == 0){
2242
/* Lower privileges */
2243
ret_errno = lower_privileges();
2244
if(ret_errno != 0){
2245
errno = ret_errno;
2246
perror_plus("Failed to lower privileges");
2247
}
2248
}
1721
2249
1722
2250
/* Close the socket */
1723
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2251
int ret = close(sd);
1724
2252
if(ret == -1){
1725
2253
perror_plus("close");
1726
2254
}
1727
2255
1728
2256
if(ret_setflags == -1){
1729
errno = ret_errno;
2257
errno = ioctl_errno;
1730
2258
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1731
2259
errno = old_errno;
1732
return ret_errno;
2260
return ioctl_errno;
1733
2261
}
1734
2262
} else if(debug){
1735
2263
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1741
2269
}
1742
2270
1743
2271
int main(int argc, char *argv[]){
2272
mandos_context mc = { .server = NULL, .dh_bits = 0,
2273
.priority = "SECURE256:!CTYPE-X.509"
2274
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2275
.current_server = NULL, .interfaces = NULL,
2276
.interfaces_size = 0 };
1744
2277
AvahiSServiceBrowser *sb = NULL;
1745
2278
error_t ret_errno;
1746
2279
int ret;
1747
2280
intmax_t tmpmax;
1748
2281
char *tmp;
1749
2282
int exitcode = EXIT_SUCCESS;
1750
char *interfaces = NULL;
1751
size_t interfaces_size = 0;
1752
2283
char *interfaces_to_take_down = NULL;
1753
2284
size_t interfaces_to_take_down_size = 0;
1754
char tempdir[] = "/tmp/mandosXXXXXX";
1755
bool tempdir_created = false;
2285
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2286
char old_tempdir[] = "/tmp/mandosXXXXXX";
2287
char *tempdir = NULL;
1756
2288
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1757
2289
const char *seckey = PATHDIR "/" SECKEY;
1758
2290
const char *pubkey = PATHDIR "/" PUBKEY;
2291
const char *dh_params_file = NULL;
1759
2292
char *interfaces_hooks = NULL;
1760
size_t interfaces_hooks_size = 0;
1761
2293
1762
2294
bool gnutls_initialized = false;
1763
2295
bool gpgme_initialized = false;
1815
2347
.doc = "Bit length of the prime number used in the"
1816
2348
" Diffie-Hellman key exchange",
1817
2349
.group = 2 },
2350
{ .name = "dh-params", .key = 134,
2351
.arg = "FILE",
2352
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2353
" for the Diffie-Hellman key exchange",
2354
.group = 2 },
1818
2355
{ .name = "priority", .key = 130,
1819
2356
.arg = "STRING",
1820
2357
.doc = "GnuTLS priority string for the TLS handshake",
1854
2391
connect_to = arg;
1855
2392
break;
1856
2393
case 'i': /* --interface */
1857
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1858
(int)',');
2394
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2395
arg, (int)',');
1859
2396
if(ret_errno != 0){
1860
2397
argp_error(state, "%s", strerror(ret_errno));
1861
2398
}
1875
2412
}
1876
2413
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1877
2414
break;
2415
case 134: /* --dh-params */
2416
dh_params_file = arg;
2417
break;
1878
2418
case 130: /* --priority */
1879
2419
mc.priority = arg;
1880
2420
break;
1936
2476
goto end;
1937
2477
}
1938
2478
}
1939
2479
1940
2480
{
1941
2481
/* Work around Debian bug #633582:
1942
2482
<http://bugs.debian.org/633582> */
1943
2483
1944
/* Re-raise priviliges */
1945
if(raise_privileges() == 0){
2484
/* Re-raise privileges */
2485
ret_errno = raise_privileges();
2486
if(ret_errno != 0){
2487
errno = ret_errno;
2488
perror_plus("Failed to raise privileges");
2489
} else {
1946
2490
struct stat st;
1947
2491
1948
2492
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1962
2506
}
1963
2507
}
1964
2508
}
1965
TEMP_FAILURE_RETRY(close(seckey_fd));
2509
close(seckey_fd);
1966
2510
}
1967
2511
}
1968
2512
1969
2513
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1970
2514
int pubkey_fd = open(pubkey, O_RDONLY);
1971
2515
if(pubkey_fd == -1){
1983
2527
}
1984
2528
}
1985
2529
}
1986
TEMP_FAILURE_RETRY(close(pubkey_fd));
1987
}
1988
}
1989
2530
close(pubkey_fd);
2531
}
2532
}
2533
2534
if(dh_params_file != NULL
2535
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2536
int dhparams_fd = open(dh_params_file, O_RDONLY);
2537
if(dhparams_fd == -1){
2538
perror_plus("open");
2539
} else {
2540
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2541
if(ret == -1){
2542
perror_plus("fstat");
2543
} else {
2544
if(S_ISREG(st.st_mode)
2545
and st.st_uid == 0 and st.st_gid == 0){
2546
ret = fchown(dhparams_fd, uid, gid);
2547
if(ret == -1){
2548
perror_plus("fchown");
2549
}
2550
}
2551
}
2552
close(dhparams_fd);
2553
}
2554
}
2555
1990
2556
/* Lower privileges */
1991
errno = 0;
1992
ret = seteuid(uid);
1993
if(ret == -1){
1994
perror_plus("seteuid");
2557
ret_errno = lower_privileges();
2558
if(ret_errno != 0){
2559
errno = ret_errno;
2560
perror_plus("Failed to lower privileges");
1995
2561
}
1996
2562
}
1997
2563
}
1998
2564
1999
/* Remove empty interface names */
2565
/* Remove invalid interface names (except "none") */
2000
2566
{
2001
2567
char *interface = NULL;
2002
while((interface = argz_next(interfaces, interfaces_size,
2568
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2003
2569
interface))){
2004
if(if_nametoindex(interface) == 0){
2005
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2570
if(strcmp(interface, "none") != 0
2571
and if_nametoindex(interface) == 0){
2572
if(interface[0] != '\0'){
2006
2573
fprintf_plus(stderr, "Not using nonexisting interface"
2007
2574
" \"%s\"\n", interface);
2008
2575
}
2009
argz_delete(&interfaces, &interfaces_size, interface);
2576
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2010
2577
interface = NULL;
2011
2578
}
2012
2579
}
2014
2581
2015
2582
/* Run network hooks */
2016
2583
{
2017
ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,
2018
interfaces, interfaces_size);
2019
if(ret_errno != 0){
2020
errno = ret_errno;
2021
perror_plus("argz_append");
2022
goto end;
2023
}
2024
argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');
2025
if(not run_network_hooks("start", interfaces_hooks, delay)){
2026
goto end;
2027
}
2584
if(mc.interfaces != NULL){
2585
interfaces_hooks = malloc(mc.interfaces_size);
2586
if(interfaces_hooks == NULL){
2587
perror_plus("malloc");
2588
goto end;
2589
}
2590
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2591
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2592
}
2593
run_network_hooks("start", interfaces_hooks != NULL ?
2594
interfaces_hooks : "", delay);
2028
2595
}
2029
2596
2030
2597
if(not debug){
2035
2602
from the signal handler */
2036
2603
/* Initialize the pseudo-RNG for Avahi */
2037
2604
srand((unsigned int) time(NULL));
2038
mc.simple_poll = avahi_simple_poll_new();
2039
if(mc.simple_poll == NULL){
2605
simple_poll = avahi_simple_poll_new();
2606
if(simple_poll == NULL){
2040
2607
fprintf_plus(stderr,
2041
2608
"Avahi: Failed to create simple poll object.\n");
2042
2609
exitcode = EX_UNAVAILABLE;
2107
2674
}
2108
2675
2109
2676
/* If no interfaces were specified, make a list */
2110
if(interfaces == NULL){
2111
struct dirent **direntries;
2677
if(mc.interfaces == NULL){
2678
struct dirent **direntries = NULL;
2112
2679
/* Look for any good interfaces */
2113
2680
ret = scandir(sys_class_net, &direntries, good_interface,
2114
2681
alphasort);
2115
2682
if(ret >= 1){
2116
2683
/* Add all found interfaces to interfaces list */
2117
2684
for(int i = 0; i < ret; ++i){
2118
ret_errno = argz_add(&interfaces, &interfaces_size,
2685
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2119
2686
direntries[i]->d_name);
2120
2687
if(ret_errno != 0){
2688
errno = ret_errno;
2121
2689
perror_plus("argz_add");
2690
free(direntries[i]);
2122
2691
continue;
2123
2692
}
2124
2693
if(debug){
2125
2694
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2126
2695
direntries[i]->d_name);
2127
2696
}
2697
free(direntries[i]);
2128
2698
}
2129
2699
free(direntries);
2130
2700
} else {
2131
free(direntries);
2701
if(ret == 0){
2702
free(direntries);
2703
}
2132
2704
fprintf_plus(stderr, "Could not find a network interface\n");
2133
2705
exitcode = EXIT_FAILURE;
2134
2706
goto end;
2135
2707
}
2136
2708
}
2137
2709
2138
/* If we only got one interface, explicitly use only that one */
2139
if(argz_count(interfaces, interfaces_size) == 1){
2140
if(debug){
2141
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2142
interfaces);
2143
}
2144
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2145
}
2146
2147
/* Bring up interfaces which are down */
2148
if(not (argz_count(interfaces, interfaces_size) == 1
2149
and strcmp(interfaces, "none") == 0)){
2710
/* Bring up interfaces which are down, and remove any "none"s */
2711
{
2150
2712
char *interface = NULL;
2151
while((interface = argz_next(interfaces, interfaces_size,
2713
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2152
2714
interface))){
2715
/* If interface name is "none", stop bringing up interfaces.
2716
Also remove all instances of "none" from the list */
2717
if(strcmp(interface, "none") == 0){
2718
argz_delete(&mc.interfaces, &mc.interfaces_size,
2719
interface);
2720
interface = NULL;
2721
while((interface = argz_next(mc.interfaces,
2722
mc.interfaces_size, interface))){
2723
if(strcmp(interface, "none") == 0){
2724
argz_delete(&mc.interfaces, &mc.interfaces_size,
2725
interface);
2726
interface = NULL;
2727
}
2728
}
2729
break;
2730
}
2153
2731
bool interface_was_up = interface_is_up(interface);
2154
ret = bring_up_interface(interface, delay);
2732
errno = bring_up_interface(interface, delay);
2155
2733
if(not interface_was_up){
2156
if(ret != 0){
2157
errno = ret;
2158
perror_plus("Failed to bring up interface");
2734
if(errno != 0){
2735
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2736
" %s\n", interface, strerror(errno));
2159
2737
} else {
2160
ret_errno = argz_add(&interfaces_to_take_down,
2161
&interfaces_to_take_down_size,
2162
interface);
2738
errno = argz_add(&interfaces_to_take_down,
2739
&interfaces_to_take_down_size,
2740
interface);
2741
if(errno != 0){
2742
perror_plus("argz_add");
2743
}
2163
2744
}
2164
2745
}
2165
2746
}
2166
free(interfaces);
2167
interfaces = NULL;
2168
interfaces_size = 0;
2169
2747
if(debug and (interfaces_to_take_down == NULL)){
2170
2748
fprintf_plus(stderr, "No interfaces were brought up\n");
2171
2749
}
2172
2750
}
2173
2751
2752
/* If we only got one interface, explicitly use only that one */
2753
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2754
if(debug){
2755
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2756
mc.interfaces);
2757
}
2758
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2759
}
2760
2174
2761
if(quit_now){
2175
2762
goto end;
2176
2763
}
2177
2764
2178
ret = init_gnutls_global(pubkey, seckey);
2765
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2179
2766
if(ret == -1){
2180
2767
fprintf_plus(stderr, "init_gnutls_global failed\n");
2181
2768
exitcode = EX_UNAVAILABLE;
2188
2775
goto end;
2189
2776
}
2190
2777
2191
if(mkdtemp(tempdir) == NULL){
2778
/* Try /run/tmp before /tmp */
2779
tempdir = mkdtemp(run_tempdir);
2780
if(tempdir == NULL and errno == ENOENT){
2781
if(debug){
2782
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2783
run_tempdir, old_tempdir);
2784
}
2785
tempdir = mkdtemp(old_tempdir);
2786
}
2787
if(tempdir == NULL){
2192
2788
perror_plus("mkdtemp");
2193
2789
goto end;
2194
2790
}
2195
tempdir_created = true;
2196
2791
2197
2792
if(quit_now){
2198
2793
goto end;
2199
2794
}
2200
2795
2201
if(not init_gpgme(pubkey, seckey, tempdir)){
2796
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2202
2797
fprintf_plus(stderr, "init_gpgme failed\n");
2203
2798
exitcode = EX_UNAVAILABLE;
2204
2799
goto end;
2225
2820
goto end;
2226
2821
}
2227
2822
2228
uint16_t port;
2823
in_port_t port;
2229
2824
errno = 0;
2230
2825
tmpmax = strtoimax(address+1, &tmp, 10);
2231
2826
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2232
or tmpmax != (uint16_t)tmpmax){
2827
or tmpmax != (in_port_t)tmpmax){
2233
2828
fprintf_plus(stderr, "Bad port number\n");
2234
2829
exitcode = EX_USAGE;
2235
2830
goto end;
2236
2831
}
2237
2832
2238
2833
if(quit_now){
2239
2834
goto end;
2240
2835
}
2241
2836
2242
port = (uint16_t)tmpmax;
2837
port = (in_port_t)tmpmax;
2243
2838
*address = '\0';
2244
2839
/* Colon in address indicates IPv6 */
2245
2840
int af;
2261
2856
}
2262
2857
2263
2858
while(not quit_now){
2264
ret = start_mandos_communication(address, port, if_index, af);
2859
ret = start_mandos_communication(address, port, if_index, af,
2860
&mc);
2265
2861
if(quit_now or ret == 0){
2266
2862
break;
2267
2863
}
2269
2865
fprintf_plus(stderr, "Retrying in %d seconds\n",
2270
2866
(int)retry_interval);
2271
2867
}
2272
sleep((int)retry_interval);
2868
sleep((unsigned int)retry_interval);
2273
2869
}
2274
2870
2275
if (not quit_now){
2871
if(not quit_now){
2276
2872
exitcode = EXIT_SUCCESS;
2277
2873
}
2278
2874
2293
2889
config.publish_domain = 0;
2294
2890
2295
2891
/* Allocate a new server */
2296
mc.server = avahi_server_new(avahi_simple_poll_get
2297
(mc.simple_poll), &config, NULL,
2298
NULL, &ret_errno);
2892
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2893
&config, NULL, NULL, &ret_errno);
2299
2894
2300
2895
/* Free the Avahi configuration data */
2301
2896
avahi_server_config_free(&config);
2316
2911
/* Create the Avahi service browser */
2317
2912
sb = avahi_s_service_browser_new(mc.server, if_index,
2318
2913
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2319
NULL, 0, browse_callback, NULL);
2914
NULL, 0, browse_callback,
2915
(void *)&mc);
2320
2916
if(sb == NULL){
2321
2917
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2322
2918
avahi_strerror(avahi_server_errno(mc.server)));
2333
2929
if(debug){
2334
2930
fprintf_plus(stderr, "Starting Avahi loop search\n");
2335
2931
}
2336
2337
ret = avahi_loop_with_timeout(mc.simple_poll,
2338
(int)(retry_interval * 1000));
2932
2933
ret = avahi_loop_with_timeout(simple_poll,
2934
(int)(retry_interval * 1000), &mc);
2339
2935
if(debug){
2340
2936
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2341
2937
(ret == 0) ? "successfully" : "with error");
2348
2944
}
2349
2945
2350
2946
/* Cleanup things */
2947
free(mc.interfaces);
2948
2351
2949
if(sb != NULL)
2352
2950
avahi_s_service_browser_free(sb);
2353
2951
2354
2952
if(mc.server != NULL)
2355
2953
avahi_server_free(mc.server);
2356
2954
2357
if(mc.simple_poll != NULL)
2358
avahi_simple_poll_free(mc.simple_poll);
2955
if(simple_poll != NULL)
2956
avahi_simple_poll_free(simple_poll);
2359
2957
2360
2958
if(gnutls_initialized){
2361
2959
gnutls_certificate_free_credentials(mc.cred);
2362
gnutls_global_deinit();
2363
2960
gnutls_dh_params_deinit(mc.dh_params);
2364
2961
}
2365
2962
2373
2970
mc.current_server->prev->next = NULL;
2374
2971
while(mc.current_server != NULL){
2375
2972
server *next = mc.current_server->next;
2973
#ifdef __GNUC__
2974
#pragma GCC diagnostic push
2975
#pragma GCC diagnostic ignored "-Wcast-qual"
2976
#endif
2977
free((char *)(mc.current_server->ip));
2978
#ifdef __GNUC__
2979
#pragma GCC diagnostic pop
2980
#endif
2376
2981
free(mc.current_server);
2377
2982
mc.current_server = next;
2378
2983
}
2379
2984
}
2380
2985
2381
/* Re-raise priviliges */
2986
/* Re-raise privileges */
2382
2987
{
2383
raise_privileges();
2384
2385
/* Run network hooks */
2386
run_network_hooks("stop", interfaces_hooks, delay);
2387
2388
/* Take down the network interfaces which were brought up */
2389
{
2390
char *interface = NULL;
2391
while((interface=argz_next(interfaces_to_take_down,
2392
interfaces_to_take_down_size,
2393
interface))){
2394
ret_errno = take_down_interface(interface);
2395
if(ret_errno != 0){
2396
errno = ret_errno;
2397
perror_plus("Failed to take down interface");
2398
}
2399
}
2400
if(debug and (interfaces_to_take_down == NULL)){
2401
fprintf_plus(stderr, "No interfaces needed to be taken"
2402
" down\n");
2403
}
2404
}
2405
2406
lower_privileges_permanently();
2988
ret_errno = raise_privileges();
2989
if(ret_errno != 0){
2990
errno = ret_errno;
2991
perror_plus("Failed to raise privileges");
2992
} else {
2993
2994
/* Run network hooks */
2995
run_network_hooks("stop", interfaces_hooks != NULL ?
2996
interfaces_hooks : "", delay);
2997
2998
/* Take down the network interfaces which were brought up */
2999
{
3000
char *interface = NULL;
3001
while((interface=argz_next(interfaces_to_take_down,
3002
interfaces_to_take_down_size,
3003
interface))){
3004
ret_errno = take_down_interface(interface);
3005
if(ret_errno != 0){
3006
errno = ret_errno;
3007
perror_plus("Failed to take down interface");
3008
}
3009
}
3010
if(debug and (interfaces_to_take_down == NULL)){
3011
fprintf_plus(stderr, "No interfaces needed to be taken"
3012
" down\n");
3013
}
3014
}
3015
}
3016
3017
ret_errno = lower_privileges_permanently();
3018
if(ret_errno != 0){
3019
errno = ret_errno;
3020
perror_plus("Failed to lower privileges permanently");
3021
}
2407
3022
}
2408
3023
2409
3024
free(interfaces_to_take_down);
2410
3025
free(interfaces_hooks);
2411
3026
2412
3027
/* Removes the GPGME temp directory and all files inside */
2413
if(tempdir_created){
3028
if(tempdir != NULL){
2414
3029
struct dirent **direntries = NULL;
2415
struct dirent *direntry = NULL;
2416
int numentries = scandir(tempdir, &direntries, notdotentries,
2417
alphasort);
2418
if (numentries > 0){
2419
for(int i = 0; i < numentries; i++){
2420
direntry = direntries[i];
2421
char *fullname = NULL;
2422
ret = asprintf(&fullname, "%s/%s", tempdir,
2423
direntry->d_name);
2424
if(ret < 0){
2425
perror_plus("asprintf");
2426
continue;
2427
}
2428
ret = remove(fullname);
2429
if(ret == -1){
2430
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2431
strerror(errno));
2432
}
2433
free(fullname);
3030
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3031
| O_NOFOLLOW
3032
| O_DIRECTORY
3033
| O_PATH));
3034
if(tempdir_fd == -1){
3035
perror_plus("open");
3036
} else {
3037
int numentries = scandirat(tempdir_fd, ".", &direntries,
3038
notdotentries, alphasort);
3039
if(numentries >= 0){
3040
for(int i = 0; i < numentries; i++){
3041
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3042
if(ret == -1){
3043
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3044
" \"%s\", 0): %s\n", tempdir,
3045
direntries[i]->d_name, strerror(errno));
3046
}
3047
free(direntries[i]);
3048
}
3049
3050
/* need to clean even if 0 because man page doesn't specify */
3051
free(direntries);
3052
if(numentries == -1){
3053
perror_plus("scandir");
3054
}
3055
ret = rmdir(tempdir);
3056
if(ret == -1 and errno != ENOENT){
3057
perror_plus("rmdir");
3058
}
2434
3059
}
2435
}
2436
2437
/* need to clean even if 0 because man page doesn't specify */
2438
free(direntries);
2439
if (numentries == -1){
2440
perror_plus("scandir");
2441
}
2442
ret = rmdir(tempdir);
2443
if(ret == -1 and errno != ENOENT){
2444
perror_plus("rmdir");
3060
close(tempdir_fd);
2445
3061
}
2446
3062
}
2447
3063
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0