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- Committer: Teddy Hogeborn
- Date: 2011-11-29 18:19:31 UTC
- mto: (505.2.13 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111129181931-vctlij1omtu1qbnx
* initramfs-tools-hook: Set DEVICE for network hooks.
- files removed:
- debian/mandos-client.examples
- debian/upstream
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
78
#include <iso646.h> /* not, or, and */
80
79
#include <argp.h> /* struct argp_option, error_t, struct
81
80
argp_state, struct argp,
89
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
89
WEXITSTATUS(), WTERMSIG() */
91
90
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
91
99
92
#ifdef __linux__
100
93
#include <sys/klog.h> /* klogctl() */
142
135
static const char sys_class_net[] = "/sys/class/net";
143
136
char *connect_to = NULL;
144
137
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
138
149
139
/* Doubly linked list that need to be circularly linked when used */
150
140
typedef struct server{
151
141
const char *ip;
152
in_port_t port;
142
uint16_t port;
153
143
AvahiIfIndex if_index;
154
144
int af;
155
145
struct timespec last_seen;
159
149
160
150
/* Used for passing in values through the Avahi callback functions */
161
151
typedef struct {
152
AvahiSimplePoll *simple_poll;
162
153
AvahiServer *server;
163
154
gnutls_certificate_credentials_t cred;
164
155
unsigned int dh_bits;
166
157
const char *priority;
167
158
gpgme_ctx_t ctx;
168
159
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
160
} mandos_context;
172
161
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
175
167
176
168
sig_atomic_t quit_now = 0;
177
169
int signal_received = 0;
178
170
179
171
/* Function to use when printing errors */
180
172
void perror_plus(const char *print_text){
181
int e = errno;
182
173
fprintf(stderr, "Mandos plugin %s: ",
183
174
program_invocation_short_name);
184
errno = e;
185
175
perror(print_text);
186
176
}
187
177
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
178
int fprintf_plus(FILE *stream, const char *format, ...){
190
179
va_list ap;
191
180
va_start (ap, format);
192
181
193
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
183
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
185
}
197
186
198
187
/*
200
189
* bytes. "buffer_capacity" is how much is currently allocated,
201
190
* "buffer_length" is how much is already used.
202
191
*/
203
__attribute__((nonnull, warn_unused_result))
204
192
size_t incbuffer(char **buffer, size_t buffer_length,
205
193
size_t buffer_capacity){
206
194
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
if(buffer == NULL){
213
197
return 0;
214
198
}
215
*buffer = new_buf;
216
199
buffer_capacity += BUFFER_SIZE;
217
200
}
218
201
return buffer_capacity;
219
202
}
220
203
221
204
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
225
207
int ret;
226
208
server *new_server = malloc(sizeof(server));
227
209
if(new_server == NULL){
228
210
perror_plus("malloc");
229
return false;
211
return -1;
230
212
}
231
213
*new_server = (server){ .ip = strdup(ip),
232
214
.port = port,
234
216
.af = af };
235
217
if(new_server->ip == NULL){
236
218
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
219
return -1;
253
220
}
254
221
/* Special case of first server */
255
if(*current_server == NULL){
222
if (mc.current_server == NULL){
256
223
new_server->next = new_server;
257
224
new_server->prev = new_server;
258
*current_server = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
259
227
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
263
230
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return -1;
237
}
238
return 0;
267
239
}
268
240
269
241
/*
270
242
* Initialize GPGME.
271
243
*/
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){
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
277
246
gpgme_error_t rc;
278
247
gpgme_engine_info_t engine_info;
279
248
249
280
250
/*
281
251
* Helper function to insert pub and seckey to the engine keyring.
282
252
*/
283
bool import_key(const char * const filename){
253
bool import_key(const char *filename){
284
254
int ret;
285
255
int fd;
286
256
gpgme_data_t pgp_data;
298
268
return false;
299
269
}
300
270
301
rc = gpgme_op_import(mc->ctx, pgp_data);
271
rc = gpgme_op_import(mc.ctx, pgp_data);
302
272
if(rc != GPG_ERR_NO_ERROR){
303
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
274
gpgme_strsource(rc), gpgme_strerror(rc));
348
318
}
349
319
350
320
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
321
rc = gpgme_new(&(mc.ctx));
352
322
if(rc != GPG_ERR_NO_ERROR){
353
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
367
337
* Decrypt OpenPGP data.
368
338
* Returns -1 on error
369
339
*/
370
__attribute__((nonnull, warn_unused_result))
371
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
341
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
342
char **plaintext){
375
343
gpgme_data_t dh_crypto, dh_plain;
376
344
gpgme_error_t rc;
377
345
ssize_t ret;
403
371
404
372
/* Decrypt data from the cryptotext data buffer to the plaintext
405
373
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
375
if(rc != GPG_ERR_NO_ERROR){
408
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
377
gpgme_strsource(rc), gpgme_strerror(rc));
410
378
plaintext_length = -1;
411
379
if(debug){
412
380
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
381
result = gpgme_op_decrypt_result(mc.ctx);
414
382
if(result == NULL){
415
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
416
384
} else {
493
461
return plaintext_length;
494
462
}
495
463
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);
464
static const char * safer_gnutls_strerror(int value){
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
467
if(ret == NULL)
468
ret = "(unknown)";
469
return ret;
507
470
}
508
471
509
472
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
473
static void debuggnutls(__attribute__((unused)) int level,
512
474
const char* string){
513
475
fprintf_plus(stderr, "GnuTLS: %s", string);
514
476
}
515
477
516
__attribute__((nonnull, warn_unused_result))
517
478
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
mandos_context *mc){
479
const char *seckeyfilename){
520
480
int ret;
521
unsigned int uret;
522
481
523
482
if(debug){
524
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
540
499
}
541
500
542
501
/* OpenPGP credentials */
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
544
503
if(ret != GNUTLS_E_SUCCESS){
545
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
505
safer_gnutls_strerror(ret));
556
515
}
557
516
558
517
ret = gnutls_certificate_set_openpgp_key_file
559
(mc->cred, pubkeyfilename, seckeyfilename,
518
(mc.cred, pubkeyfilename, seckeyfilename,
560
519
GNUTLS_OPENPGP_FMT_BASE64);
561
520
if(ret != GNUTLS_E_SUCCESS){
562
521
fprintf_plus(stderr,
568
527
}
569
528
570
529
/* GnuTLS server initialization */
571
ret = gnutls_dh_params_init(&mc->dh_params);
530
ret = gnutls_dh_params_init(&mc.dh_params);
572
531
if(ret != GNUTLS_E_SUCCESS){
573
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
574
533
" initialization: %s\n",
575
534
safer_gnutls_strerror(ret));
576
535
goto globalfail;
577
536
}
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);
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
680
538
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
683
541
goto globalfail;
684
542
}
685
543
686
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
687
545
688
546
return 0;
689
547
690
548
globalfail:
691
549
692
gnutls_certificate_free_credentials(mc->cred);
550
gnutls_certificate_free_credentials(mc.cred);
693
551
gnutls_global_deinit();
694
gnutls_dh_params_deinit(mc->dh_params);
552
gnutls_dh_params_deinit(mc.dh_params);
695
553
return -1;
696
554
}
697
555
698
__attribute__((nonnull, warn_unused_result))
699
static int init_gnutls_session(gnutls_session_t *session,
700
mandos_context *mc){
556
static int init_gnutls_session(gnutls_session_t *session){
701
557
int ret;
702
558
/* GnuTLS session creation */
703
559
do {
715
571
{
716
572
const char *err;
717
573
do {
718
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
719
575
if(quit_now){
720
576
gnutls_deinit(*session);
721
577
return -1;
732
588
733
589
do {
734
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
735
mc->cred);
591
mc.cred);
736
592
if(quit_now){
737
593
gnutls_deinit(*session);
738
594
return -1;
748
604
/* ignore client certificate if any. */
749
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
750
606
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
752
608
753
609
return 0;
754
610
}
757
613
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
758
614
__attribute__((unused)) const char *txt){}
759
615
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
977
616
/* Called when a Mandos server is found */
978
__attribute__((nonnull, warn_unused_result))
979
static int start_mandos_communication(const char *ip, in_port_t port,
617
static int start_mandos_communication(const char *ip, uint16_t port,
980
618
AvahiIfIndex if_index,
981
int af, mandos_context *mc){
619
int af){
982
620
int ret, tcp_sd = -1;
983
621
ssize_t sret;
984
struct sockaddr_storage to;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
985
626
char *buffer = NULL;
986
627
char *decrypted_buffer = NULL;
987
628
size_t buffer_length = 0;
990
631
int retval = -1;
991
632
gnutls_session_t session;
992
633
int pf; /* Protocol family */
993
bool route_added = false;
994
634
995
635
errno = 0;
996
636
1012
652
return -1;
1013
653
}
1014
654
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);
655
ret = init_gnutls_session(&session);
1048
656
if(ret != 0){
1049
657
return -1;
1050
658
}
1051
659
1052
660
if(debug){
1053
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1054
PRIuMAX "\n", ip, (uintmax_t)port);
662
PRIu16 "\n", ip, port);
1055
663
}
1056
664
1057
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
1058
666
if(tcp_sd < 0){
1059
667
int e = errno;
1060
668
perror_plus("socket");
1069
677
1070
678
memset(&to, 0, sizeof(to));
1071
679
if(af == AF_INET6){
1072
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1073
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
680
to.in6.sin6_family = (sa_family_t)af;
681
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1074
682
} else { /* IPv4 */
1075
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1076
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
683
to.in.sin_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in.sin_addr);
1077
685
}
1078
686
if(ret < 0 ){
1079
687
int e = errno;
1088
696
goto mandos_end;
1089
697
}
1090
698
if(af == AF_INET6){
1091
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1092
if(IN6_IS_ADDR_LINKLOCAL
1093
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
1094
706
if(if_index == AVAHI_IF_UNSPEC){
1095
707
fprintf_plus(stderr, "An IPv6 link-local address is"
1096
708
" incomplete without a network interface\n");
1098
710
goto mandos_end;
1099
711
}
1100
712
/* Set the network interface number as scope */
1101
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
713
to.in6.sin6_scope_id = (uint32_t)if_index;
1102
714
}
1103
715
} else {
1104
((struct sockaddr_in *)&to)->sin_port = htons(port);
716
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wconversion and
718
-Wunreachable-code */
1105
719
}
1106
720
1107
721
if(quit_now){
1115
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1116
730
perror_plus("if_indextoname");
1117
731
} else {
1118
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1119
"\n", ip, interface, (uintmax_t)port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
1120
734
}
1121
735
} else {
1122
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1123
ip, (uintmax_t)port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
1124
738
}
1125
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1126
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
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;
741
const char *pcret;
742
if(af == AF_INET6){
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
745
} else {
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
748
}
749
if(pcret == NULL){
750
perror_plus("inet_ntop");
751
} else {
752
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
754
}
755
}
756
}
757
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
761
}
762
763
if(af == AF_INET6){
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
765
} else {
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
767
}
768
if(ret < 0){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
int e = errno;
771
perror_plus("connect");
772
errno = e;
773
}
774
goto mandos_end;
775
}
776
777
if(quit_now){
778
errno = EINTR;
779
goto mandos_end;
1207
780
}
1208
781
1209
782
const char *out = mandos_protocol_version;
1245
818
goto mandos_end;
1246
819
}
1247
820
1248
/* This casting via intptr_t is to eliminate warning about casting
1249
an int to a pointer type. This is exactly how the GnuTLS Guile
1250
function "set-session-transport-fd!" does it. */
1251
gnutls_transport_set_ptr(session,
1252
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
821
/* Spurious warning from -Wint-to-pointer-cast */
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1253
823
1254
824
if(quit_now){
1255
825
errno = EINTR;
1360
930
if(buffer_length > 0){
1361
931
ssize_t decrypted_buffer_size;
1362
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1363
&decrypted_buffer, mc);
933
&decrypted_buffer);
1364
934
if(decrypted_buffer_size >= 0){
1365
935
1366
936
written = 0;
1392
962
1393
963
mandos_end:
1394
964
{
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
}
1401
965
int e = errno;
1402
966
free(decrypted_buffer);
1403
967
free(buffer);
1420
984
return retval;
1421
985
}
1422
986
1423
__attribute__((nonnull))
1424
987
static void resolve_callback(AvahiSServiceResolver *r,
1425
988
AvahiIfIndex interface,
1426
989
AvahiProtocol proto,
1434
997
AVAHI_GCC_UNUSED AvahiStringList *txt,
1435
998
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1436
999
flags,
1437
void *mc){
1438
if(r == NULL){
1439
return;
1440
}
1000
AVAHI_GCC_UNUSED void* userdata){
1001
assert(r);
1441
1002
1442
1003
/* Called whenever a service has been resolved successfully or
1443
1004
timed out */
1444
1005
1445
1006
if(quit_now){
1446
avahi_s_service_resolver_free(r);
1447
1007
return;
1448
1008
}
1449
1009
1453
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1454
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1455
1015
domain,
1456
avahi_strerror(avahi_server_errno
1457
(((mandos_context*)mc)->server)));
1016
avahi_strerror(avahi_server_errno(mc.server)));
1458
1017
break;
1459
1018
1460
1019
case AVAHI_RESOLVER_FOUND:
1466
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1467
1026
host_name, ip, (intmax_t)interface, port);
1468
1027
}
1469
int ret = start_mandos_communication(ip, (in_port_t)port,
1470
interface,
1471
avahi_proto_to_af(proto),
1472
mc);
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1473
1030
if(ret == 0){
1474
avahi_simple_poll_quit(simple_poll);
1031
avahi_simple_poll_quit(mc.simple_poll);
1475
1032
} else {
1476
if(not add_server(ip, (in_port_t)port, interface,
1477
avahi_proto_to_af(proto),
1478
&((mandos_context*)mc)->current_server)){
1479
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1480
" list\n", name);
1481
}
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1482
1035
}
1483
1036
}
1484
1037
}
1494
1047
const char *domain,
1495
1048
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1496
1049
flags,
1497
void *mc){
1498
if(b == NULL){
1499
return;
1500
}
1050
AVAHI_GCC_UNUSED void* userdata){
1051
assert(b);
1501
1052
1502
1053
/* Called whenever a new services becomes available on the LAN or
1503
1054
is removed from the LAN */
1511
1062
case AVAHI_BROWSER_FAILURE:
1512
1063
1513
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1514
avahi_strerror(avahi_server_errno
1515
(((mandos_context*)mc)->server)));
1516
avahi_simple_poll_quit(simple_poll);
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1517
1067
return;
1518
1068
1519
1069
case AVAHI_BROWSER_NEW:
1522
1072
the callback function is called the Avahi server will free the
1523
1073
resolver for us. */
1524
1074
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)
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1529
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1530
1079
" %s\n", name,
1531
avahi_strerror(avahi_server_errno
1532
(((mandos_context*)mc)->server)));
1080
avahi_strerror(avahi_server_errno(mc.server)));
1533
1081
break;
1534
1082
1535
1083
case AVAHI_BROWSER_REMOVE:
1554
1102
signal_received = sig;
1555
1103
int old_errno = errno;
1556
1104
/* set main loop to exit */
1557
if(simple_poll != NULL){
1558
avahi_simple_poll_quit(simple_poll);
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1559
1107
}
1560
1108
errno = old_errno;
1561
1109
}
1562
1110
1563
__attribute__((nonnull, warn_unused_result))
1564
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1565
1112
int ret;
1566
error_t ret_errno;
1567
1113
1568
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1569
1115
if(s < 0){
1570
ret_errno = errno;
1571
1116
perror_plus("socket");
1572
errno = ret_errno;
1573
1117
return false;
1574
1118
}
1575
1119
strcpy(ifr->ifr_name, ifname);
1576
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1577
1121
if(ret == -1){
1578
1122
if(debug){
1579
ret_errno = errno;
1580
1123
perror_plus("ioctl SIOCGIFFLAGS");
1581
errno = ret_errno;
1582
1124
}
1583
1125
return false;
1584
1126
}
1585
1127
return true;
1586
1128
}
1587
1129
1588
__attribute__((nonnull, warn_unused_result))
1589
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1590
1131
1591
1132
/* Reject the loopback device */
1633
1174
* corresponds to an acceptable network device.
1634
1175
* (This function is passed to scandir(3) as a filter function.)
1635
1176
*/
1636
__attribute__((nonnull, warn_unused_result))
1637
1177
int good_interface(const struct dirent *if_entry){
1638
1178
if(if_entry->d_name[0] == '.'){
1639
1179
return 0;
1655
1195
}
1656
1196
1657
1197
/*
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))
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1201
*/
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1204
return 0;
1205
}
1206
1207
struct ifreq ifr;
1208
if(not get_flags(if_entry->d_name, &ifr)){
1209
if(debug){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1212
}
1213
return 0;
1214
}
1215
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1218
if(debug){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1220
if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
if(not good_flags(if_entry->d_name, &ifr)){
1235
return 0;
1236
}
1237
return 1;
1238
}
1239
1692
1240
int notdotentries(const struct dirent *direntry){
1693
1241
/* Skip "." and ".." */
1694
1242
if(direntry->d_name[0] == '.'
1701
1249
}
1702
1250
1703
1251
/* Is this directory entry a runnable program? */
1704
__attribute__((nonnull, warn_unused_result))
1705
1252
int runnable_hook(const struct dirent *direntry){
1706
1253
int ret;
1707
1254
size_t sret;
1715
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1716
1263
"abcdefghijklmnopqrstuvwxyz"
1717
1264
"0123456789"
1718
"_.-");
1265
"_-");
1719
1266
if((direntry->d_name)[sret] != '\0'){
1720
1267
/* Contains non-allowed characters */
1721
1268
if(debug){
1725
1272
return 0;
1726
1273
}
1727
1274
1728
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
if(ret < 0){
1278
perror_plus("asprintf");
1279
return 0;
1280
}
1281
1282
ret = stat(fullname, &st);
1729
1283
if(ret == -1){
1730
1284
if(debug){
1731
1285
perror_plus("Could not stat hook");
1755
1309
return 1;
1756
1310
}
1757
1311
1758
__attribute__((nonnull, warn_unused_result))
1759
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1760
mandos_context *mc){
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1761
1313
int ret;
1762
1314
struct timespec now;
1763
1315
struct timespec waited_time;
1764
1316
intmax_t block_time;
1765
1317
1766
1318
while(true){
1767
if(mc->current_server == NULL){
1768
if(debug){
1319
if(mc.current_server == NULL){
1320
if (debug){
1769
1321
fprintf_plus(stderr, "Wait until first server is found."
1770
1322
" No timeout!\n");
1771
1323
}
1772
1324
ret = avahi_simple_poll_iterate(s, -1);
1773
1325
} else {
1774
if(debug){
1326
if (debug){
1775
1327
fprintf_plus(stderr, "Check current_server if we should run"
1776
1328
" it, or wait\n");
1777
1329
}
1784
1336
/* Calculating in ms how long time between now and server
1785
1337
who we visted longest time ago. Now - last seen. */
1786
1338
waited_time.tv_sec = (now.tv_sec
1787
- mc->current_server->last_seen.tv_sec);
1339
- mc.current_server->last_seen.tv_sec);
1788
1340
waited_time.tv_nsec = (now.tv_nsec
1789
- mc->current_server->last_seen.tv_nsec);
1341
- mc.current_server->last_seen.tv_nsec);
1790
1342
/* total time is 10s/10,000ms.
1791
1343
Converting to s from ms by dividing by 1,000,
1792
1344
and ns to ms by dividing by 1,000,000. */
1794
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1795
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1796
1348
1797
if(debug){
1349
if (debug){
1798
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1799
1351
block_time);
1800
1352
}
1801
1353
1802
1354
if(block_time <= 0){
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);
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1807
1359
if(ret == 0){
1808
avahi_simple_poll_quit(s);
1360
avahi_simple_poll_quit(mc.simple_poll);
1809
1361
return 0;
1810
1362
}
1811
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1812
&mc->current_server->last_seen);
1364
&mc.current_server->last_seen);
1813
1365
if(ret == -1){
1814
1366
perror_plus("clock_gettime");
1815
1367
return -1;
1816
1368
}
1817
mc->current_server = mc->current_server->next;
1369
mc.current_server = mc.current_server->next;
1818
1370
block_time = 0; /* Call avahi to find new Mandos
1819
1371
servers, but don't block */
1820
1372
}
1822
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1823
1375
}
1824
1376
if(ret != 0){
1825
if(ret > 0 or errno != EINTR){
1377
if (ret > 0 or errno != EINTR){
1826
1378
return (ret != 1) ? ret : 0;
1827
1379
}
1828
1380
}
1829
1381
}
1830
1382
}
1831
1383
1832
__attribute__((nonnull))
1833
void run_network_hooks(const char *mode, const char *interface,
1384
bool run_network_hooks(const char *mode, const char *interface,
1834
1385
const float delay){
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__ */
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1388
int ret;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1390
alphasort);
1863
1391
if(numhooks == -1){
1864
1392
perror_plus("scandir");
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){
1393
} else {
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
if(ret < 0){
1926
1400
perror_plus("asprintf");
1927
_exit(EX_OSERR);
1928
}
1929
ret = setenv("DELAY", delaystring, 1);
1930
if(ret == -1){
1401
continue;
1402
}
1403
if(debug){
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1405
direntry->d_name);
1406
}
1407
pid_t hook_pid = fork();
1408
if(hook_pid == 0){
1409
/* Child */
1410
/* Raise privileges */
1411
errno = 0;
1412
ret = seteuid(0);
1413
if(ret == -1){
1414
perror_plus("seteuid");
1415
}
1416
/* Raise privileges even more */
1417
errno = 0;
1418
ret = setuid(0);
1419
if(ret == -1){
1420
perror_plus("setuid");
1421
}
1422
/* Set group */
1423
errno = 0;
1424
ret = setgid(0);
1425
if(ret == -1){
1426
perror_plus("setgid");
1427
}
1428
/* Reset supplementary groups */
1429
errno = 0;
1430
ret = setgroups(0, NULL);
1431
if(ret == -1){
1432
perror_plus("setgroups");
1433
}
1434
dup2(devnull, STDIN_FILENO);
1435
close(devnull);
1436
dup2(STDERR_FILENO, STDOUT_FILENO);
1437
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1438
if(ret == -1){
1439
perror_plus("setenv");
1440
_exit(EX_OSERR);
1441
}
1442
ret = setenv("DEVICE", interface, 1);
1443
if(ret == -1){
1444
perror_plus("setenv");
1445
_exit(EX_OSERR);
1446
}
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1448
if(ret == -1){
1449
perror_plus("setenv");
1450
_exit(EX_OSERR);
1451
}
1452
ret = setenv("MODE", mode, 1);
1453
if(ret == -1){
1454
perror_plus("setenv");
1455
_exit(EX_OSERR);
1456
}
1457
char *delaystring;
1458
ret = asprintf(&delaystring, "%f", delay);
1459
if(ret == -1){
1460
perror_plus("asprintf");
1461
_exit(EX_OSERR);
1462
}
1463
ret = setenv("DELAY", delaystring, 1);
1464
if(ret == -1){
1465
free(delaystring);
1466
perror_plus("setenv");
1467
_exit(EX_OSERR);
1468
}
1931
1469
free(delaystring);
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;
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1472
} else {
1473
int status;
1474
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1475
perror_plus("waitpid");
1476
free(fullname);
1477
continue;
1478
}
1479
if(WIFEXITED(status)){
1480
if(WEXITSTATUS(status) != 0){
1481
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1482
" with status %d\n", direntry->d_name,
1483
WEXITSTATUS(status));
1484
free(fullname);
1485
continue;
1486
}
1487
} else if(WIFSIGNALED(status)){
1488
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1489
" signal %d\n", direntry->d_name,
1490
WTERMSIG(status));
1491
free(fullname);
1492
continue;
1493
} else {
1494
fprintf_plus(stderr, "Warning: network hook \"%s\""
1495
" crashed\n", direntry->d_name);
1496
free(fullname);
1497
continue;
1498
}
1499
}
1500
free(fullname);
1501
if(debug){
1502
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1503
direntry->d_name);
1504
}
1505
}
1506
close(devnull);
1507
}
1508
return true;
2222
1509
}
2223
1510
2224
1511
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 };
2229
1512
AvahiSServiceBrowser *sb = NULL;
2230
error_t ret_errno;
1513
int error;
2231
1514
int ret;
2232
1515
intmax_t tmpmax;
2233
1516
char *tmp;
2234
1517
int exitcode = EXIT_SUCCESS;
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;
1518
const char *interface = "";
1519
struct ifreq network;
1520
int sd = -1;
1521
bool take_down_interface = false;
1522
uid_t uid;
1523
gid_t gid;
1524
char tempdir[] = "/tmp/mandosXXXXXX";
1525
bool tempdir_created = false;
2240
1526
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2241
1527
const char *seckey = PATHDIR "/" SECKEY;
2242
1528
const char *pubkey = PATHDIR "/" PUBKEY;
2243
char *interfaces_hooks = NULL;
2244
1529
2245
1530
bool gnutls_initialized = false;
2246
1531
bool gpgme_initialized = false;
2308
1593
.group = 2 },
2309
1594
{ .name = "retry", .key = 132,
2310
1595
.arg = "SECONDS",
2311
.doc = "Retry interval used when denied by the Mandos server",
1596
.doc = "Retry interval used when denied by the mandos server",
2312
1597
.group = 2 },
2313
1598
{ .name = "network-hook-dir", .key = 133,
2314
1599
.arg = "DIR",
2337
1622
connect_to = arg;
2338
1623
break;
2339
1624
case 'i': /* --interface */
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
}
1625
interface = arg;
2345
1626
break;
2346
1627
case 's': /* --seckey */
2347
1628
seckey = arg;
2390
1671
argp_state_help(state, state->out_stream,
2391
1672
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2392
1673
case 'V': /* --version */
1674
fprintf_plus(state->out_stream,
1675
"Mandos plugin mandos-client: ");
2393
1676
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2394
1677
exit(argp_err_exit_status);
2395
1678
break;
2419
1702
goto end;
2420
1703
}
2421
1704
}
2422
1705
2423
1706
{
2424
1707
/* Work around Debian bug #633582:
2425
1708
<http://bugs.debian.org/633582> */
2426
1709
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");
1710
/* Re-raise priviliges */
1711
errno = 0;
1712
ret = seteuid(0);
1713
if(ret == -1){
1714
perror_plus("seteuid");
2432
1715
} else {
2433
1716
struct stat st;
2434
1717
2452
1735
TEMP_FAILURE_RETRY(close(seckey_fd));
2453
1736
}
2454
1737
}
2455
1738
2456
1739
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2457
1740
int pubkey_fd = open(pubkey, O_RDONLY);
2458
1741
if(pubkey_fd == -1){
2473
1756
TEMP_FAILURE_RETRY(close(pubkey_fd));
2474
1757
}
2475
1758
}
2476
1759
2477
1760
/* Lower privileges */
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;
1761
errno = 0;
1762
ret = seteuid(uid);
1763
if(ret == -1){
1764
perror_plus("seteuid");
2499
1765
}
2500
1766
}
2501
1767
}
2502
1768
2503
1769
/* Run network hooks */
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);
1770
if(not run_network_hooks("start", interface, delay)){
1771
goto end;
2516
1772
}
2517
1773
2518
1774
if(not debug){
2519
1775
avahi_set_log_function(empty_log);
2520
1776
}
2521
1777
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1782
alphasort);
1783
if(ret == 0){
1784
/* No up interfaces, look for any good interfaces */
1785
free(direntries);
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1787
alphasort);
1788
}
1789
if(ret >= 1){
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1792
if(debug){
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1794
}
1795
if(interface == NULL){
1796
perror_plus("malloc");
1797
free(direntries);
1798
exitcode = EXIT_FAILURE;
1799
goto end;
1800
}
1801
free(direntries);
1802
} else {
1803
free(direntries);
1804
fprintf_plus(stderr, "Could not find a network interface\n");
1805
exitcode = EXIT_FAILURE;
1806
goto end;
1807
}
1808
}
1809
2522
1810
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2523
1811
from the signal handler */
2524
1812
/* Initialize the pseudo-RNG for Avahi */
2525
1813
srand((unsigned int) time(NULL));
2526
simple_poll = avahi_simple_poll_new();
2527
if(simple_poll == NULL){
1814
mc.simple_poll = avahi_simple_poll_new();
1815
if(mc.simple_poll == NULL){
2528
1816
fprintf_plus(stderr,
2529
1817
"Avahi: Failed to create simple poll object.\n");
2530
1818
exitcode = EX_UNAVAILABLE;
2594
1882
}
2595
1883
}
2596
1884
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;
1885
/* If the interface is down, bring it up */
1886
if(strcmp(interface, "none") != 0){
1887
if_index = (AvahiIfIndex) if_nametoindex(interface);
1888
if(if_index == 0){
1889
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1890
exitcode = EX_UNAVAILABLE;
1891
goto end;
1892
}
1893
1894
if(quit_now){
1895
goto end;
1896
}
1897
1898
/* Re-raise priviliges */
1899
errno = 0;
1900
ret = seteuid(0);
1901
if(ret == -1){
1902
perror_plus("seteuid");
1903
}
1904
1905
#ifdef __linux__
1906
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1907
messages about the network interface to mess up the prompt */
1908
ret = klogctl(8, NULL, 5);
1909
bool restore_loglevel = true;
1910
if(ret == -1){
1911
restore_loglevel = false;
1912
perror_plus("klogctl");
1913
}
1914
#endif /* __linux__ */
1915
1916
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1917
if(sd < 0){
1918
perror_plus("socket");
1919
exitcode = EX_OSERR;
1920
#ifdef __linux__
1921
if(restore_loglevel){
1922
ret = klogctl(7, NULL, 0);
1923
if(ret == -1){
1924
perror_plus("klogctl");
1925
}
1926
}
1927
#endif /* __linux__ */
1928
/* Lower privileges */
1929
errno = 0;
1930
ret = seteuid(uid);
1931
if(ret == -1){
1932
perror_plus("seteuid");
1933
}
1934
goto end;
1935
}
1936
strcpy(network.ifr_name, interface);
1937
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1938
if(ret == -1){
1939
perror_plus("ioctl SIOCGIFFLAGS");
1940
#ifdef __linux__
1941
if(restore_loglevel){
1942
ret = klogctl(7, NULL, 0);
1943
if(ret == -1){
1944
perror_plus("klogctl");
1945
}
1946
}
1947
#endif /* __linux__ */
1948
exitcode = EX_OSERR;
1949
/* Lower privileges */
1950
errno = 0;
1951
ret = seteuid(uid);
1952
if(ret == -1){
1953
perror_plus("seteuid");
1954
}
1955
goto end;
1956
}
1957
if((network.ifr_flags & IFF_UP) == 0){
1958
network.ifr_flags |= IFF_UP;
1959
take_down_interface = true;
1960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1961
if(ret == -1){
1962
take_down_interface = false;
1963
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1964
exitcode = EX_OSERR;
1965
#ifdef __linux__
1966
if(restore_loglevel){
1967
ret = klogctl(7, NULL, 0);
1968
if(ret == -1){
1969
perror_plus("klogctl");
2648
1970
}
2649
1971
}
1972
#endif /* __linux__ */
1973
/* Lower privileges */
1974
errno = 0;
1975
ret = seteuid(uid);
1976
if(ret == -1){
1977
perror_plus("seteuid");
1978
}
1979
goto end;
1980
}
1981
}
1982
/* Sleep checking until interface is running.
1983
Check every 0.25s, up to total time of delay */
1984
for(int i=0; i < delay * 4; i++){
1985
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1986
if(ret == -1){
1987
perror_plus("ioctl SIOCGIFFLAGS");
1988
} else if(network.ifr_flags & IFF_RUNNING){
2650
1989
break;
2651
1990
}
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);
1991
struct timespec sleeptime = { .tv_nsec = 250000000 };
1992
ret = nanosleep(&sleeptime, NULL);
1993
if(ret == -1 and errno != EINTR){
1994
perror_plus("nanosleep");
1995
}
1996
}
1997
if(not take_down_interface){
1998
/* We won't need the socket anymore */
1999
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2000
if(ret == -1){
2001
perror_plus("close");
2002
}
2003
}
2004
#ifdef __linux__
2005
if(restore_loglevel){
2006
/* Restores kernel loglevel to default */
2007
ret = klogctl(7, NULL, 0);
2008
if(ret == -1){
2009
perror_plus("klogctl");
2010
}
2011
}
2012
#endif /* __linux__ */
2013
/* Lower privileges */
2014
errno = 0;
2015
/* Lower privileges */
2016
ret = seteuid(uid);
2017
if(ret == -1){
2018
perror_plus("seteuid");
2019
}
2679
2020
}
2680
2021
2681
2022
if(quit_now){
2682
2023
goto end;
2683
2024
}
2684
2025
2685
ret = init_gnutls_global(pubkey, seckey, &mc);
2026
ret = init_gnutls_global(pubkey, seckey);
2686
2027
if(ret == -1){
2687
2028
fprintf_plus(stderr, "init_gnutls_global failed\n");
2688
2029
exitcode = EX_UNAVAILABLE;
2695
2036
goto end;
2696
2037
}
2697
2038
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){
2039
if(mkdtemp(tempdir) == NULL){
2708
2040
perror_plus("mkdtemp");
2709
2041
goto end;
2710
2042
}
2043
tempdir_created = true;
2711
2044
2712
2045
if(quit_now){
2713
2046
goto end;
2714
2047
}
2715
2048
2716
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2049
if(not init_gpgme(pubkey, seckey, tempdir)){
2717
2050
fprintf_plus(stderr, "init_gpgme failed\n");
2718
2051
exitcode = EX_UNAVAILABLE;
2719
2052
goto end;
2729
2062
/* Connect directly, do not use Zeroconf */
2730
2063
/* (Mainly meant for debugging) */
2731
2064
char *address = strrchr(connect_to, ':');
2732
2733
2065
if(address == NULL){
2734
2066
fprintf_plus(stderr, "No colon in address\n");
2735
2067
exitcode = EX_USAGE;
2740
2072
goto end;
2741
2073
}
2742
2074
2743
in_port_t port;
2075
uint16_t port;
2744
2076
errno = 0;
2745
2077
tmpmax = strtoimax(address+1, &tmp, 10);
2746
2078
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2747
or tmpmax != (in_port_t)tmpmax){
2079
or tmpmax != (uint16_t)tmpmax){
2748
2080
fprintf_plus(stderr, "Bad port number\n");
2749
2081
exitcode = EX_USAGE;
2750
2082
goto end;
2751
2083
}
2752
2084
2753
2085
if(quit_now){
2754
2086
goto end;
2755
2087
}
2756
2088
2757
port = (in_port_t)tmpmax;
2089
port = (uint16_t)tmpmax;
2758
2090
*address = '\0';
2759
2091
/* Colon in address indicates IPv6 */
2760
2092
int af;
2776
2108
}
2777
2109
2778
2110
while(not quit_now){
2779
ret = start_mandos_communication(address, port, if_index, af,
2780
&mc);
2111
ret = start_mandos_communication(address, port, if_index, af);
2781
2112
if(quit_now or ret == 0){
2782
2113
break;
2783
2114
}
2785
2116
fprintf_plus(stderr, "Retrying in %d seconds\n",
2786
2117
(int)retry_interval);
2787
2118
}
2788
sleep((unsigned int)retry_interval);
2119
sleep((int)retry_interval);
2789
2120
}
2790
2121
2791
if(not quit_now){
2122
if (not quit_now){
2792
2123
exitcode = EXIT_SUCCESS;
2793
2124
}
2794
2125
2809
2140
config.publish_domain = 0;
2810
2141
2811
2142
/* Allocate a new server */
2812
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2813
&config, NULL, NULL, &ret_errno);
2143
mc.server = avahi_server_new(avahi_simple_poll_get
2144
(mc.simple_poll), &config, NULL,
2145
NULL, &error);
2814
2146
2815
2147
/* Free the Avahi configuration data */
2816
2148
avahi_server_config_free(&config);
2819
2151
/* Check if creating the Avahi server object succeeded */
2820
2152
if(mc.server == NULL){
2821
2153
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2822
avahi_strerror(ret_errno));
2154
avahi_strerror(error));
2823
2155
exitcode = EX_UNAVAILABLE;
2824
2156
goto end;
2825
2157
}
2831
2163
/* Create the Avahi service browser */
2832
2164
sb = avahi_s_service_browser_new(mc.server, if_index,
2833
2165
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2834
NULL, 0, browse_callback,
2835
(void *)&mc);
2166
NULL, 0, browse_callback, NULL);
2836
2167
if(sb == NULL){
2837
2168
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2838
2169
avahi_strerror(avahi_server_errno(mc.server)));
2849
2180
if(debug){
2850
2181
fprintf_plus(stderr, "Starting Avahi loop search\n");
2851
2182
}
2852
2853
ret = avahi_loop_with_timeout(simple_poll,
2854
(int)(retry_interval * 1000), &mc);
2183
2184
ret = avahi_loop_with_timeout(mc.simple_poll,
2185
(int)(retry_interval * 1000));
2855
2186
if(debug){
2856
2187
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2857
2188
(ret == 0) ? "successfully" : "with error");
2864
2195
}
2865
2196
2866
2197
/* Cleanup things */
2867
free(mc.interfaces);
2868
2869
2198
if(sb != NULL)
2870
2199
avahi_s_service_browser_free(sb);
2871
2200
2872
2201
if(mc.server != NULL)
2873
2202
avahi_server_free(mc.server);
2874
2203
2875
if(simple_poll != NULL)
2876
avahi_simple_poll_free(simple_poll);
2204
if(mc.simple_poll != NULL)
2205
avahi_simple_poll_free(mc.simple_poll);
2877
2206
2878
2207
if(gnutls_initialized){
2879
2208
gnutls_certificate_free_credentials(mc.cred);
2891
2220
mc.current_server->prev->next = NULL;
2892
2221
while(mc.current_server != NULL){
2893
2222
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
2902
2223
free(mc.current_server);
2903
2224
mc.current_server = next;
2904
2225
}
2905
2226
}
2906
2227
2907
/* Re-raise privileges */
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2230
2231
/* Re-raise priviliges */
2908
2232
{
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
}
2233
errno = 0;
2234
ret = seteuid(0);
2235
if(ret == -1){
2236
perror_plus("seteuid");
2936
2237
}
2937
2238
2938
ret_errno = lower_privileges_permanently();
2939
if(ret_errno != 0){
2940
errno = ret_errno;
2941
perror_plus("Failed to lower privileges permanently");
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
2241
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2242
if(ret == -1){
2243
perror_plus("ioctl SIOCGIFFLAGS");
2244
} else if(network.ifr_flags & IFF_UP){
2245
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2246
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2247
if(ret == -1){
2248
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2249
}
2250
}
2251
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2252
if(ret == -1){
2253
perror_plus("close");
2254
}
2942
2255
}
2943
2256
}
2944
2945
free(interfaces_to_take_down);
2946
free(interfaces_hooks);
2257
/* Lower privileges permanently */
2258
errno = 0;
2259
ret = setuid(uid);
2260
if(ret == -1){
2261
perror_plus("setuid");
2262
}
2947
2263
2948
2264
/* Removes the GPGME temp directory and all files inside */
2949
if(tempdir != NULL){
2265
if(tempdir_created){
2950
2266
struct dirent **direntries = NULL;
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
}
2267
struct dirent *direntry = NULL;
2268
int numentries = scandir(tempdir, &direntries, notdotentries,
2269
alphasort);
2270
if (numentries > 0){
2271
for(int i = 0; i < numentries; i++){
2272
direntry = direntries[i];
2273
char *fullname = NULL;
2274
ret = asprintf(&fullname, "%s/%s", tempdir,
2275
direntry->d_name);
2276
if(ret < 0){
2277
perror_plus("asprintf");
2278
continue;
2279
}
2280
ret = remove(fullname);
2281
if(ret == -1){
2282
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2283
strerror(errno));
2284
}
2285
free(fullname);
2990
2286
}
2991
TEMP_FAILURE_RETRY(close(tempdir_fd));
2287
}
2288
2289
/* need to clean even if 0 because man page doesn't specify */
2290
free(direntries);
2291
if (numentries == -1){
2292
perror_plus("scandir");
2293
}
2294
ret = rmdir(tempdir);
2295
if(ret == -1 and errno != ENOENT){
2296
perror_plus("rmdir");
2992
2297
}
2993
2298
}
2994
2299
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0