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- Committer: Teddy Hogeborn
- Date: 2009-05-17 00:50:09 UTC
- Revision ID: teddy@fukt.bsnet.se-20090517005009-c0iptxampo6nf177
* initramfs-tools-hook-conf: Security bug fix: Add code to handle
being called by "mkinitramfs-kpkg"
instead of "update-initramfs".
being called by "mkinitramfs-kpkg"
instead of "update-initramfs".
- files removed:
- DBUS-API
- debian/source
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
43
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
72
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
81
80
argp_parse(), ARGP_KEY_ARG,
82
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
82
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
88
85
89
86
#ifdef __linux__
90
87
#include <sys/klog.h> /* klogctl() */
123
120
#define PATHDIR "/conf/conf.d/mandos"
124
121
#define SECKEY "seckey.txt"
125
122
#define PUBKEY "pubkey.txt"
126
#define HOOKDIR "/lib/mandos/network-hooks.d"
127
123
128
124
bool debug = false;
129
125
static const char mandos_protocol_version[] = "1";
130
126
const char *argp_program_version = "mandos-client " VERSION;
131
const char *argp_program_bug_address = "<mandos@recompile.se>";
132
static const char sys_class_net[] = "/sys/class/net";
133
char *connect_to = NULL;
134
135
/* Doubly linked list that need to be circularly linked when used */
136
typedef struct server{
137
const char *ip;
138
uint16_t port;
139
AvahiIfIndex if_index;
140
int af;
141
struct timespec last_seen;
142
struct server *next;
143
struct server *prev;
144
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
145
128
146
129
/* Used for passing in values through the Avahi callback functions */
147
130
typedef struct {
152
135
gnutls_dh_params_t dh_params;
153
136
const char *priority;
154
137
gpgme_ctx_t ctx;
155
server *current_server;
156
138
} mandos_context;
157
139
158
140
/* global context so signal handler can reach it*/
159
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
142
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
163
164
sig_atomic_t quit_now = 0;
165
int signal_received = 0;
166
167
/* Function to use when printing errors */
168
void perror_plus(const char *print_text){
169
fprintf(stderr, "Mandos plugin %s: ",
170
program_invocation_short_name);
171
perror(print_text);
172
}
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
173
144
174
145
/*
175
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
188
159
return buffer_capacity;
189
160
}
190
161
191
/* Add server to set of servers to retry periodically */
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
194
int af){
195
int ret;
196
server *new_server = malloc(sizeof(server));
197
if(new_server == NULL){
198
perror_plus("malloc");
199
return -1;
200
}
201
*new_server = (server){ .ip = strdup(ip),
202
.port = port,
203
.if_index = if_index,
204
.af = af };
205
if(new_server->ip == NULL){
206
perror_plus("strdup");
207
return -1;
208
}
209
/* Special case of first server */
210
if (mc.current_server == NULL){
211
new_server->next = new_server;
212
new_server->prev = new_server;
213
mc.current_server = new_server;
214
/* Place the new server last in the list */
215
} else {
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
218
new_server->prev->next = new_server;
219
mc.current_server->prev = new_server;
220
}
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
222
if(ret == -1){
223
perror_plus("clock_gettime");
224
return -1;
225
}
226
return 0;
227
}
228
229
162
/*
230
163
* Initialize GPGME.
231
164
*/
232
165
static bool init_gpgme(const char *seckey,
233
166
const char *pubkey, const char *tempdir){
167
int ret;
234
168
gpgme_error_t rc;
235
169
gpgme_engine_info_t engine_info;
236
170
239
173
* Helper function to insert pub and seckey to the engine keyring.
240
174
*/
241
175
bool import_key(const char *filename){
242
int ret;
243
176
int fd;
244
177
gpgme_data_t pgp_data;
245
178
246
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
247
180
if(fd == -1){
248
perror_plus("open");
181
perror("open");
249
182
return false;
250
183
}
251
184
265
198
266
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
267
200
if(ret == -1){
268
perror_plus("close");
201
perror("close");
269
202
}
270
203
gpgme_data_release(pgp_data);
271
204
return true;
284
217
return false;
285
218
}
286
219
287
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
288
221
rc = gpgme_get_engine_info(&engine_info);
289
222
if(rc != GPG_ERR_NO_ERROR){
290
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
316
249
return false;
317
250
}
318
251
319
return true;
252
return true;
320
253
}
321
254
322
255
/*
376
309
}
377
310
gpgme_recipient_t recipient;
378
311
recipient = result->recipients;
379
while(recipient != NULL){
380
fprintf(stderr, "Public key algorithm: %s\n",
381
gpgme_pubkey_algo_name(recipient->pubkey_algo));
382
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
383
fprintf(stderr, "Secret key available: %s\n",
384
recipient->status == GPG_ERR_NO_SECKEY
385
? "No" : "Yes");
386
recipient = recipient->next;
312
if(recipient){
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
319
? "No" : "Yes");
320
recipient = recipient->next;
321
}
387
322
}
388
323
}
389
324
}
396
331
397
332
/* Seek back to the beginning of the GPGME plaintext data buffer */
398
333
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
399
perror_plus("gpgme_data_seek");
334
perror("gpgme_data_seek");
400
335
plaintext_length = -1;
401
336
goto decrypt_end;
402
337
}
407
342
(size_t)plaintext_length,
408
343
plaintext_capacity);
409
344
if(plaintext_capacity == 0){
410
perror_plus("incbuffer");
345
perror("incbuffer");
411
346
plaintext_length = -1;
412
347
goto decrypt_end;
413
348
}
420
355
break;
421
356
}
422
357
if(ret < 0){
423
perror_plus("gpgme_data_read");
358
perror("gpgme_data_read");
424
359
plaintext_length = -1;
425
360
goto decrypt_end;
426
361
}
483
418
}
484
419
485
420
/* OpenPGP credentials */
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
421
gnutls_certificate_allocate_credentials(&mc.cred);
487
422
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "GnuTLS memory error: %s\n",
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
489
427
safer_gnutls_strerror(ret));
490
428
gnutls_global_deinit();
491
429
return -1;
538
476
static int init_gnutls_session(gnutls_session_t *session){
539
477
int ret;
540
478
/* GnuTLS session creation */
541
do {
542
ret = gnutls_init(session, GNUTLS_SERVER);
543
if(quit_now){
544
return -1;
545
}
546
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
479
ret = gnutls_init(session, GNUTLS_SERVER);
547
480
if(ret != GNUTLS_E_SUCCESS){
548
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
549
482
safer_gnutls_strerror(ret));
551
484
552
485
{
553
486
const char *err;
554
do {
555
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
556
if(quit_now){
557
gnutls_deinit(*session);
558
return -1;
559
}
560
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
561
488
if(ret != GNUTLS_E_SUCCESS){
562
489
fprintf(stderr, "Syntax error at: %s\n", err);
563
490
fprintf(stderr, "GnuTLS error: %s\n",
567
494
}
568
495
}
569
496
570
do {
571
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
572
mc.cred);
573
if(quit_now){
574
gnutls_deinit(*session);
575
return -1;
576
}
577
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
578
499
if(ret != GNUTLS_E_SUCCESS){
579
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
580
501
safer_gnutls_strerror(ret));
583
504
}
584
505
585
506
/* ignore client certificate if any. */
586
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
587
509
588
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
589
511
598
520
static int start_mandos_communication(const char *ip, uint16_t port,
599
521
AvahiIfIndex if_index,
600
522
int af){
601
int ret, tcp_sd = -1;
523
int ret, tcp_sd;
602
524
ssize_t sret;
603
525
union {
604
526
struct sockaddr_in in;
605
527
struct sockaddr_in6 in6;
606
528
} to;
607
529
char *buffer = NULL;
608
char *decrypted_buffer = NULL;
530
char *decrypted_buffer;
609
531
size_t buffer_length = 0;
610
532
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
611
534
size_t written;
612
int retval = -1;
535
int retval = 0;
613
536
gnutls_session_t session;
614
537
int pf; /* Protocol family */
615
538
616
errno = 0;
617
618
if(quit_now){
619
errno = EINTR;
620
return -1;
621
}
622
623
539
switch(af){
624
540
case AF_INET6:
625
541
pf = PF_INET6;
629
545
break;
630
546
default:
631
547
fprintf(stderr, "Bad address family: %d\n", af);
632
errno = EINVAL;
633
548
return -1;
634
549
}
635
550
645
560
646
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
647
562
if(tcp_sd < 0){
648
int e = errno;
649
perror_plus("socket");
650
errno = e;
651
goto mandos_end;
652
}
653
654
if(quit_now){
655
errno = EINTR;
656
goto mandos_end;
563
perror("socket");
564
return -1;
657
565
}
658
566
659
567
memset(&to, 0, sizeof(to));
660
568
if(af == AF_INET6){
661
to.in6.sin6_family = (sa_family_t)af;
569
to.in6.sin6_family = (uint16_t)af;
662
570
ret = inet_pton(af, ip, &to.in6.sin6_addr);
663
571
} else { /* IPv4 */
664
572
to.in.sin_family = (sa_family_t)af;
665
573
ret = inet_pton(af, ip, &to.in.sin_addr);
666
574
}
667
575
if(ret < 0 ){
668
int e = errno;
669
perror_plus("inet_pton");
670
errno = e;
671
goto mandos_end;
576
perror("inet_pton");
577
return -1;
672
578
}
673
579
if(ret == 0){
674
int e = errno;
675
580
fprintf(stderr, "Bad address: %s\n", ip);
676
errno = e;
677
goto mandos_end;
581
return -1;
678
582
}
679
583
if(af == AF_INET6){
680
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
687
591
if(if_index == AVAHI_IF_UNSPEC){
688
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
593
" without a network interface\n");
690
errno = EINVAL;
691
goto mandos_end;
594
return -1;
692
595
}
693
596
/* Set the network interface number as scope */
694
597
to.in6.sin6_scope_id = (uint32_t)if_index;
699
602
-Wunreachable-code */
700
603
}
701
604
702
if(quit_now){
703
errno = EINTR;
704
goto mandos_end;
705
}
706
707
605
if(debug){
708
606
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
709
607
char interface[IF_NAMESIZE];
710
608
if(if_indextoname((unsigned int)if_index, interface) == NULL){
711
perror_plus("if_indextoname");
609
perror("if_indextoname");
712
610
} else {
713
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
612
ip, interface, port);
728
626
sizeof(addrstr));
729
627
}
730
628
if(pcret == NULL){
731
perror_plus("inet_ntop");
629
perror("inet_ntop");
732
630
} else {
733
631
if(strcmp(addrstr, ip) != 0){
734
632
fprintf(stderr, "Canonical address form: %s\n", addrstr);
736
634
}
737
635
}
738
636
739
if(quit_now){
740
errno = EINTR;
741
goto mandos_end;
742
}
743
744
637
if(af == AF_INET6){
745
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
746
639
} else {
747
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
748
641
}
749
642
if(ret < 0){
750
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
751
int e = errno;
752
perror_plus("connect");
753
errno = e;
754
}
755
goto mandos_end;
756
}
757
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
643
perror("connect");
644
return -1;
761
645
}
762
646
763
647
const char *out = mandos_protocol_version;
767
651
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
768
652
out_size - written));
769
653
if(ret == -1){
770
int e = errno;
771
perror_plus("write");
772
errno = e;
654
perror("write");
655
retval = -1;
773
656
goto mandos_end;
774
657
}
775
658
written += (size_t)ret;
783
666
break;
784
667
}
785
668
}
786
787
if(quit_now){
788
errno = EINTR;
789
goto mandos_end;
790
}
791
669
}
792
670
793
671
if(debug){
794
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
795
673
}
796
674
797
if(quit_now){
798
errno = EINTR;
799
goto mandos_end;
800
}
801
802
/* Spurious warning from -Wint-to-pointer-cast */
803
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
804
676
805
if(quit_now){
806
errno = EINTR;
807
goto mandos_end;
808
}
809
810
do {
677
do{
811
678
ret = gnutls_handshake(session);
812
if(quit_now){
813
errno = EINTR;
814
goto mandos_end;
815
}
816
679
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
817
680
818
681
if(ret != GNUTLS_E_SUCCESS){
820
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
821
684
gnutls_perror(ret);
822
685
}
823
errno = EPROTO;
686
retval = -1;
824
687
goto mandos_end;
825
688
}
826
689
832
695
}
833
696
834
697
while(true){
835
836
if(quit_now){
837
errno = EINTR;
838
goto mandos_end;
839
}
840
841
698
buffer_capacity = incbuffer(&buffer, buffer_length,
842
699
buffer_capacity);
843
700
if(buffer_capacity == 0){
844
int e = errno;
845
perror_plus("incbuffer");
846
errno = e;
847
goto mandos_end;
848
}
849
850
if(quit_now){
851
errno = EINTR;
701
perror("incbuffer");
702
retval = -1;
852
703
goto mandos_end;
853
704
}
854
705
863
714
case GNUTLS_E_AGAIN:
864
715
break;
865
716
case GNUTLS_E_REHANDSHAKE:
866
do {
717
do{
867
718
ret = gnutls_handshake(session);
868
869
if(quit_now){
870
errno = EINTR;
871
goto mandos_end;
872
}
873
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
874
720
if(ret < 0){
875
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
876
722
gnutls_perror(ret);
877
errno = EPROTO;
723
retval = -1;
878
724
goto mandos_end;
879
725
}
880
726
break;
881
727
default:
882
728
fprintf(stderr, "Unknown error while reading data from"
883
729
" encrypted session with Mandos server\n");
730
retval = -1;
884
731
gnutls_bye(session, GNUTLS_SHUT_RDWR);
885
errno = EIO;
886
732
goto mandos_end;
887
733
}
888
734
} else {
894
740
fprintf(stderr, "Closing TLS session\n");
895
741
}
896
742
897
if(quit_now){
898
errno = EINTR;
899
goto mandos_end;
900
}
901
902
do {
903
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
904
if(quit_now){
905
errno = EINTR;
906
goto mandos_end;
907
}
908
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
909
744
910
745
if(buffer_length > 0){
911
ssize_t decrypted_buffer_size;
912
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
913
747
buffer_length,
914
748
&decrypted_buffer);
915
749
if(decrypted_buffer_size >= 0){
916
917
750
written = 0;
918
751
while(written < (size_t) decrypted_buffer_size){
919
if(quit_now){
920
errno = EINTR;
921
goto mandos_end;
922
}
923
924
752
ret = (int)fwrite(decrypted_buffer + written, 1,
925
753
(size_t)decrypted_buffer_size - written,
926
754
stdout);
927
755
if(ret == 0 and ferror(stdout)){
928
int e = errno;
929
756
if(debug){
930
757
fprintf(stderr, "Error writing encrypted data: %s\n",
931
758
strerror(errno));
932
759
}
933
errno = e;
934
goto mandos_end;
760
retval = -1;
761
break;
935
762
}
936
763
written += (size_t)ret;
937
764
}
938
retval = 0;
765
free(decrypted_buffer);
766
} else {
767
retval = -1;
939
768
}
769
} else {
770
retval = -1;
940
771
}
941
772
942
773
/* Shutdown procedure */
943
774
944
775
mandos_end:
945
{
946
int e = errno;
947
free(decrypted_buffer);
948
free(buffer);
949
if(tcp_sd >= 0){
950
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
951
}
952
if(ret == -1){
953
if(e == 0){
954
e = errno;
955
}
956
perror_plus("close");
957
}
958
gnutls_deinit(session);
959
errno = e;
960
if(quit_now){
961
errno = EINTR;
962
retval = -1;
963
}
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
964
780
}
781
gnutls_deinit(session);
965
782
return retval;
966
783
}
967
784
984
801
/* Called whenever a service has been resolved successfully or
985
802
timed out */
986
803
987
if(quit_now){
988
return;
989
}
990
991
804
switch(event){
992
805
default:
993
806
case AVAHI_RESOLVER_FAILURE:
1009
822
avahi_proto_to_af(proto));
1010
823
if(ret == 0){
1011
824
avahi_simple_poll_quit(mc.simple_poll);
1012
} else {
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1015
825
}
1016
826
}
1017
827
}
1033
843
/* Called whenever a new services becomes available on the LAN or
1034
844
is removed from the LAN */
1035
845
1036
if(quit_now){
1037
return;
1038
}
1039
1040
846
switch(event){
1041
847
default:
1042
848
case AVAHI_BROWSER_FAILURE:
1071
877
}
1072
878
}
1073
879
1074
/* Signal handler that stops main loop after SIGTERM */
1075
static void handle_sigterm(int sig){
880
sig_atomic_t quit_now = 0;
881
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
1076
884
if(quit_now){
1077
885
return;
1078
886
}
1079
887
quit_now = 1;
1080
signal_received = sig;
1081
888
int old_errno = errno;
1082
/* set main loop to exit */
1083
889
if(mc.simple_poll != NULL){
1084
890
avahi_simple_poll_quit(mc.simple_poll);
1085
891
}
1086
892
errno = old_errno;
1087
893
}
1088
894
1089
bool get_flags(const char *ifname, struct ifreq *ifr){
1090
int ret;
1091
1092
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1093
if(s < 0){
1094
perror_plus("socket");
1095
return false;
1096
}
1097
strcpy(ifr->ifr_name, ifname);
1098
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1099
if(ret == -1){
1100
if(debug){
1101
perror_plus("ioctl SIOCGIFFLAGS");
1102
}
1103
return false;
1104
}
1105
return true;
1106
}
1107
1108
bool good_flags(const char *ifname, const struct ifreq *ifr){
1109
1110
/* Reject the loopback device */
1111
if(ifr->ifr_flags & IFF_LOOPBACK){
1112
if(debug){
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1115
}
1116
return false;
1117
}
1118
/* Accept point-to-point devices only if connect_to is specified */
1119
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1120
if(debug){
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1123
}
1124
return true;
1125
}
1126
/* Otherwise, reject non-broadcast-capable devices */
1127
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1128
if(debug){
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1131
}
1132
return false;
1133
}
1134
/* Reject non-ARP interfaces (including dummy interfaces) */
1135
if(ifr->ifr_flags & IFF_NOARP){
1136
if(debug){
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1138
}
1139
return false;
1140
}
1141
1142
/* Accept this device */
1143
if(debug){
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1145
}
1146
return true;
1147
}
1148
1149
/*
1150
* This function determines if a directory entry in /sys/class/net
1151
* corresponds to an acceptable network device.
1152
* (This function is passed to scandir(3) as a filter function.)
1153
*/
1154
int good_interface(const struct dirent *if_entry){
1155
if(if_entry->d_name[0] == '.'){
1156
return 0;
1157
}
1158
1159
struct ifreq ifr;
1160
if(not get_flags(if_entry->d_name, &ifr)){
1161
if(debug){
1162
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1163
if_entry->d_name);
1164
}
1165
return 0;
1166
}
1167
1168
if(not good_flags(if_entry->d_name, &ifr)){
1169
return 0;
1170
}
1171
return 1;
1172
}
1173
1174
/*
1175
* This function determines if a directory entry in /sys/class/net
1176
* corresponds to an acceptable network device which is up.
1177
* (This function is passed to scandir(3) as a filter function.)
1178
*/
1179
int up_interface(const struct dirent *if_entry){
1180
if(if_entry->d_name[0] == '.'){
1181
return 0;
1182
}
1183
1184
struct ifreq ifr;
1185
if(not get_flags(if_entry->d_name, &ifr)){
1186
if(debug){
1187
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1188
if_entry->d_name);
1189
}
1190
return 0;
1191
}
1192
1193
/* Reject down interfaces */
1194
if(not (ifr.ifr_flags & IFF_UP)){
1195
if(debug){
1196
fprintf(stderr, "Rejecting down interface \"%s\"\n",
1197
if_entry->d_name);
1198
}
1199
return 0;
1200
}
1201
1202
/* Reject non-running interfaces */
1203
if(not (ifr.ifr_flags & IFF_RUNNING)){
1204
if(debug){
1205
fprintf(stderr, "Rejecting non-running interface \"%s\"\n",
1206
if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1215
}
1216
1217
int notdotentries(const struct dirent *direntry){
1218
/* Skip "." and ".." */
1219
if(direntry->d_name[0] == '.'
1220
and (direntry->d_name[1] == '\0'
1221
or (direntry->d_name[1] == '.'
1222
and direntry->d_name[2] == '\0'))){
1223
return 0;
1224
}
1225
return 1;
1226
}
1227
1228
/* Is this directory entry a runnable program? */
1229
int runnable_hook(const struct dirent *direntry){
1230
int ret;
1231
struct stat st;
1232
1233
if((direntry->d_name)[0] == '\0'){
1234
/* Empty name? */
1235
return 0;
1236
}
1237
1238
/* Save pointer to last character */
1239
char *end = strchr(direntry->d_name, '\0')-1;
1240
1241
if(*end == '~'){
1242
/* Backup name~ */
1243
return 0;
1244
}
1245
1246
if(((direntry->d_name)[0] == '#')
1247
and (*end == '#')){
1248
/* Temporary #name# */
1249
return 0;
1250
}
1251
1252
/* XXX more rules here */
1253
1254
ret = stat(direntry->d_name, &st);
1255
if(ret == -1){
1256
if(debug){
1257
perror_plus("Could not stat plugin");
1258
}
1259
return 0;
1260
}
1261
if(not (S_ISREG(st.st_mode))){
1262
/* Not a regular file */
1263
return 0;
1264
}
1265
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1266
/* Not executable */
1267
return 0;
1268
}
1269
return 1;
1270
}
1271
1272
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1273
int ret;
1274
struct timespec now;
1275
struct timespec waited_time;
1276
intmax_t block_time;
1277
1278
while(true){
1279
if(mc.current_server == NULL){
1280
if (debug){
1281
fprintf(stderr,
1282
"Wait until first server is found. No timeout!\n");
1283
}
1284
ret = avahi_simple_poll_iterate(s, -1);
1285
} else {
1286
if (debug){
1287
fprintf(stderr, "Check current_server if we should run it,"
1288
" or wait\n");
1289
}
1290
/* the current time */
1291
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1292
if(ret == -1){
1293
perror_plus("clock_gettime");
1294
return -1;
1295
}
1296
/* Calculating in ms how long time between now and server
1297
who we visted longest time ago. Now - last seen. */
1298
waited_time.tv_sec = (now.tv_sec
1299
- mc.current_server->last_seen.tv_sec);
1300
waited_time.tv_nsec = (now.tv_nsec
1301
- mc.current_server->last_seen.tv_nsec);
1302
/* total time is 10s/10,000ms.
1303
Converting to s from ms by dividing by 1,000,
1304
and ns to ms by dividing by 1,000,000. */
1305
block_time = ((retry_interval
1306
- ((intmax_t)waited_time.tv_sec * 1000))
1307
- ((intmax_t)waited_time.tv_nsec / 1000000));
1308
1309
if (debug){
1310
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1311
}
1312
1313
if(block_time <= 0){
1314
ret = start_mandos_communication(mc.current_server->ip,
1315
mc.current_server->port,
1316
mc.current_server->if_index,
1317
mc.current_server->af);
1318
if(ret == 0){
1319
avahi_simple_poll_quit(mc.simple_poll);
1320
return 0;
1321
}
1322
ret = clock_gettime(CLOCK_MONOTONIC,
1323
&mc.current_server->last_seen);
1324
if(ret == -1){
1325
perror_plus("clock_gettime");
1326
return -1;
1327
}
1328
mc.current_server = mc.current_server->next;
1329
block_time = 0; /* Call avahi to find new Mandos
1330
servers, but don't block */
1331
}
1332
1333
ret = avahi_simple_poll_iterate(s, (int)block_time);
1334
}
1335
if(ret != 0){
1336
if (ret > 0 or errno != EINTR) {
1337
return (ret != 1) ? ret : 0;
1338
}
1339
}
1340
}
1341
}
1342
1343
895
int main(int argc, char *argv[]){
1344
896
AvahiSServiceBrowser *sb = NULL;
1345
897
int error;
1347
899
intmax_t tmpmax;
1348
900
char *tmp;
1349
901
int exitcode = EXIT_SUCCESS;
1350
const char *interface = "";
902
const char *interface = "eth0";
1351
903
struct ifreq network;
1352
int sd = -1;
1353
bool take_down_interface = false;
904
int sd;
1354
905
uid_t uid;
1355
906
gid_t gid;
907
char *connect_to = NULL;
1356
908
char tempdir[] = "/tmp/mandosXXXXXX";
1357
909
bool tempdir_created = false;
1358
910
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1362
914
bool gnutls_initialized = false;
1363
915
bool gpgme_initialized = false;
1364
916
float delay = 2.5f;
1365
double retry_interval = 10; /* 10s between trying a server and
1366
retrying the same server again */
1367
917
1368
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
918
struct sigaction old_sigterm_action;
1369
919
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1370
920
1371
uid = getuid();
1372
gid = getgid();
1373
1374
/* Lower any group privileges we might have, just to be safe */
1375
errno = 0;
1376
ret = setgid(gid);
1377
if(ret == -1){
1378
perror_plus("setgid");
1379
}
1380
1381
/* Lower user privileges (temporarily) */
1382
errno = 0;
1383
ret = seteuid(uid);
1384
if(ret == -1){
1385
perror_plus("seteuid");
1386
}
1387
1388
if(quit_now){
1389
goto end;
1390
}
1391
1392
921
{
1393
922
struct argp_option options[] = {
1394
923
{ .name = "debug", .key = 128,
1423
952
.arg = "SECONDS",
1424
953
.doc = "Maximum delay to wait for interface startup",
1425
954
.group = 2 },
1426
{ .name = "retry", .key = 132,
1427
.arg = "SECONDS",
1428
.doc = "Retry interval used when denied by the mandos server",
1429
.group = 2 },
1430
/*
1431
* These reproduce what we would get without ARGP_NO_HELP
1432
*/
1433
{ .name = "help", .key = '?',
1434
.doc = "Give this help list", .group = -1 },
1435
{ .name = "usage", .key = -3,
1436
.doc = "Give a short usage message", .group = -1 },
1437
{ .name = "version", .key = 'V',
1438
.doc = "Print program version", .group = -1 },
1439
955
{ .name = NULL }
1440
956
};
1441
957
1442
958
error_t parse_opt(int key, char *arg,
1443
959
struct argp_state *state){
1444
errno = 0;
1445
960
switch(key){
1446
961
case 128: /* --debug */
1447
962
debug = true;
1463
978
tmpmax = strtoimax(arg, &tmp, 10);
1464
979
if(errno != 0 or tmp == arg or *tmp != '\0'
1465
980
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1466
argp_error(state, "Bad number of DH bits");
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
1467
983
}
1468
984
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1469
985
break;
1474
990
errno = 0;
1475
991
delay = strtof(arg, &tmp);
1476
992
if(errno != 0 or tmp == arg or *tmp != '\0'){
1477
argp_error(state, "Bad delay");
1478
}
1479
case 132: /* --retry */
1480
errno = 0;
1481
retry_interval = strtod(arg, &tmp);
1482
if(errno != 0 or tmp == arg or *tmp != '\0'
1483
or (retry_interval * 1000) > INT_MAX
1484
or retry_interval < 0){
1485
argp_error(state, "Bad retry interval");
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
1486
995
}
1487
996
break;
1488
/*
1489
* These reproduce what we would get without ARGP_NO_HELP
1490
*/
1491
case '?': /* --help */
1492
argp_state_help(state, state->out_stream,
1493
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1494
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1495
case -3: /* --usage */
1496
argp_state_help(state, state->out_stream,
1497
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1498
case 'V': /* --version */
1499
fprintf(state->out_stream, "%s\n", argp_program_version);
1500
exit(argp_err_exit_status);
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
1501
1000
break;
1502
1001
default:
1503
1002
return ARGP_ERR_UNKNOWN;
1504
1003
}
1505
return errno;
1004
return 0;
1506
1005
}
1507
1006
1508
1007
struct argp argp = { .options = options, .parser = parse_opt,
1509
1008
.args_doc = "",
1510
1009
.doc = "Mandos client -- Get and decrypt"
1511
1010
" passwords from a Mandos server" };
1512
ret = argp_parse(&argp, argc, argv,
1513
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1514
switch(ret){
1515
case 0:
1516
break;
1517
case ENOMEM:
1518
default:
1519
errno = ret;
1520
perror_plus("argp_parse");
1521
exitcode = EX_OSERR;
1522
goto end;
1523
case EINVAL:
1524
exitcode = EX_USAGE;
1525
goto end;
1526
}
1527
}
1528
1529
{
1530
/* Work around Debian bug #633582:
1531
<http://bugs.debian.org/633582> */
1532
struct stat st;
1533
1534
/* Re-raise priviliges */
1535
errno = 0;
1536
ret = seteuid(0);
1537
if(ret == -1){
1538
perror_plus("seteuid");
1539
}
1540
1541
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1542
int seckey_fd = open(seckey, O_RDONLY);
1543
if(seckey_fd == -1){
1544
perror_plus("open");
1545
} else {
1546
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1547
if(ret == -1){
1548
perror_plus("fstat");
1549
} else {
1550
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1551
ret = fchown(seckey_fd, uid, gid);
1552
if(ret == -1){
1553
perror_plus("fchown");
1554
}
1555
}
1556
}
1557
TEMP_FAILURE_RETRY(close(seckey_fd));
1558
}
1559
}
1560
1561
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1562
int pubkey_fd = open(pubkey, O_RDONLY);
1563
if(pubkey_fd == -1){
1564
perror_plus("open");
1565
} else {
1566
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1567
if(ret == -1){
1568
perror_plus("fstat");
1569
} else {
1570
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1571
ret = fchown(pubkey_fd, uid, gid);
1572
if(ret == -1){
1573
perror_plus("fchown");
1574
}
1575
}
1576
}
1577
TEMP_FAILURE_RETRY(close(pubkey_fd));
1578
}
1579
}
1580
1581
/* Lower privileges */
1582
errno = 0;
1583
ret = seteuid(uid);
1584
if(ret == -1){
1585
perror_plus("seteuid");
1586
}
1587
}
1588
1589
/* Find network hooks and run them */
1590
{
1591
struct dirent **direntries;
1592
struct dirent *direntry;
1593
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1594
alphasort);
1595
int devnull = open("/dev/null", O_RDONLY);
1596
for(int i = 0; i < numhooks; i++){
1597
direntry = direntries[0];
1598
char *fullname = NULL;
1599
ret = asprintf(&fullname, "%s/%s", tempdir,
1600
direntry->d_name);
1601
if(ret < 0){
1602
perror_plus("asprintf");
1603
continue;
1604
}
1605
pid_t hook_pid = fork();
1606
if(hook_pid == 0){
1607
/* Child */
1608
dup2(devnull, STDIN_FILENO);
1609
close(devnull);
1610
dup2(STDERR_FILENO, STDOUT_FILENO);
1611
ret = setenv("DEVICE", interface, 1);
1612
if(ret == -1){
1613
perror_plus("setenv");
1614
exit(1);
1615
}
1616
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1617
if(ret == -1){
1618
perror_plus("setenv");
1619
exit(1);
1620
}
1621
ret = setenv("MODE", "start", 1);
1622
if(ret == -1){
1623
perror_plus("setenv");
1624
exit(1);
1625
}
1626
char *delaystring;
1627
ret = asprintf(&delaystring, "%f", delay);
1628
if(ret == -1){
1629
perror_plus("asprintf");
1630
exit(1);
1631
}
1632
ret = setenv("DELAY", delaystring, 1);
1633
if(ret == -1){
1634
free(delaystring);
1635
perror_plus("setenv");
1636
exit(1);
1637
}
1638
free(delaystring);
1639
ret = execl(fullname, direntry->d_name, "start", NULL);
1640
perror_plus("execl");
1641
}
1642
free(fullname);
1643
if(quit_now){
1644
goto end;
1645
}
1646
}
1647
close(devnull);
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1015
goto end;
1016
}
1648
1017
}
1649
1018
1650
1019
if(not debug){
1651
1020
avahi_set_log_function(empty_log);
1652
1021
}
1653
1022
1654
if(interface[0] == '\0'){
1655
struct dirent **direntries;
1656
/* First look for interfaces that are up */
1657
ret = scandir(sys_class_net, &direntries, up_interface,
1658
alphasort);
1659
if(ret == 0){
1660
/* No up interfaces, look for any good interfaces */
1661
free(direntries);
1662
ret = scandir(sys_class_net, &direntries, good_interface,
1663
alphasort);
1664
}
1665
if(ret >= 1){
1666
/* Pick the first interface returned */
1667
interface = strdup(direntries[0]->d_name);
1668
if(debug){
1669
fprintf(stderr, "Using interface \"%s\"\n", interface);
1670
}
1671
if(interface == NULL){
1672
perror_plus("malloc");
1673
free(direntries);
1674
exitcode = EXIT_FAILURE;
1675
goto end;
1676
}
1677
free(direntries);
1678
} else {
1679
free(direntries);
1680
fprintf(stderr, "Could not find a network interface\n");
1681
exitcode = EXIT_FAILURE;
1682
goto end;
1683
}
1684
}
1685
1686
1023
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1687
1024
from the signal handler */
1688
1025
/* Initialize the pseudo-RNG for Avahi */
1690
1027
mc.simple_poll = avahi_simple_poll_new();
1691
1028
if(mc.simple_poll == NULL){
1692
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1693
exitcode = EX_UNAVAILABLE;
1030
exitcode = EXIT_FAILURE;
1694
1031
goto end;
1695
1032
}
1696
1033
1697
1034
sigemptyset(&sigterm_action.sa_mask);
1698
1035
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1699
1036
if(ret == -1){
1700
perror_plus("sigaddset");
1701
exitcode = EX_OSERR;
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
1702
1039
goto end;
1703
1040
}
1704
1041
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1705
1042
if(ret == -1){
1706
perror_plus("sigaddset");
1707
exitcode = EX_OSERR;
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
1708
1045
goto end;
1709
1046
}
1710
1047
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1711
1048
if(ret == -1){
1712
perror_plus("sigaddset");
1713
exitcode = EX_OSERR;
1714
goto end;
1715
}
1716
/* Need to check if the handler is SIG_IGN before handling:
1717
| [[info:libc:Initial Signal Actions]] |
1718
| [[info:libc:Basic Signal Handling]] |
1719
*/
1720
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1721
if(ret == -1){
1722
perror_plus("sigaction");
1723
return EX_OSERR;
1724
}
1725
if(old_sigterm_action.sa_handler != SIG_IGN){
1726
ret = sigaction(SIGINT, &sigterm_action, NULL);
1727
if(ret == -1){
1728
perror_plus("sigaction");
1729
exitcode = EX_OSERR;
1730
goto end;
1731
}
1732
}
1733
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1734
if(ret == -1){
1735
perror_plus("sigaction");
1736
return EX_OSERR;
1737
}
1738
if(old_sigterm_action.sa_handler != SIG_IGN){
1739
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1740
if(ret == -1){
1741
perror_plus("sigaction");
1742
exitcode = EX_OSERR;
1743
goto end;
1744
}
1745
}
1746
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1747
if(ret == -1){
1748
perror_plus("sigaction");
1749
return EX_OSERR;
1750
}
1751
if(old_sigterm_action.sa_handler != SIG_IGN){
1752
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1753
if(ret == -1){
1754
perror_plus("sigaction");
1755
exitcode = EX_OSERR;
1756
goto end;
1757
}
1758
}
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1051
goto end;
1052
}
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
if(ret == -1){
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1759
1059
1760
1060
/* If the interface is down, bring it up */
1761
if(strcmp(interface, "none") != 0){
1762
if_index = (AvahiIfIndex) if_nametoindex(interface);
1763
if(if_index == 0){
1764
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1765
exitcode = EX_UNAVAILABLE;
1766
goto end;
1767
}
1768
1769
if(quit_now){
1770
goto end;
1771
}
1772
1773
/* Re-raise priviliges */
1774
errno = 0;
1775
ret = seteuid(0);
1776
if(ret == -1){
1777
perror_plus("seteuid");
1778
}
1779
1061
if(interface[0] != '\0'){
1780
1062
#ifdef __linux__
1781
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1782
messages about the network interface to mess up the prompt */
1064
messages to mess up the prompt */
1783
1065
ret = klogctl(8, NULL, 5);
1784
1066
bool restore_loglevel = true;
1785
1067
if(ret == -1){
1786
1068
restore_loglevel = false;
1787
perror_plus("klogctl");
1069
perror("klogctl");
1788
1070
}
1789
1071
#endif /* __linux__ */
1790
1072
1791
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1792
1074
if(sd < 0){
1793
perror_plus("socket");
1794
exitcode = EX_OSERR;
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1795
1077
#ifdef __linux__
1796
1078
if(restore_loglevel){
1797
1079
ret = klogctl(7, NULL, 0);
1798
1080
if(ret == -1){
1799
perror_plus("klogctl");
1081
perror("klogctl");
1800
1082
}
1801
1083
}
1802
1084
#endif /* __linux__ */
1803
/* Lower privileges */
1804
errno = 0;
1805
ret = seteuid(uid);
1806
if(ret == -1){
1807
perror_plus("seteuid");
1808
}
1809
1085
goto end;
1810
1086
}
1811
1087
strcpy(network.ifr_name, interface);
1812
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1813
1089
if(ret == -1){
1814
perror_plus("ioctl SIOCGIFFLAGS");
1090
perror("ioctl SIOCGIFFLAGS");
1815
1091
#ifdef __linux__
1816
1092
if(restore_loglevel){
1817
1093
ret = klogctl(7, NULL, 0);
1818
1094
if(ret == -1){
1819
perror_plus("klogctl");
1095
perror("klogctl");
1820
1096
}
1821
1097
}
1822
1098
#endif /* __linux__ */
1823
exitcode = EX_OSERR;
1824
/* Lower privileges */
1825
errno = 0;
1826
ret = seteuid(uid);
1827
if(ret == -1){
1828
perror_plus("seteuid");
1829
}
1099
exitcode = EXIT_FAILURE;
1830
1100
goto end;
1831
1101
}
1832
1102
if((network.ifr_flags & IFF_UP) == 0){
1833
1103
network.ifr_flags |= IFF_UP;
1834
take_down_interface = true;
1835
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1836
1105
if(ret == -1){
1837
take_down_interface = false;
1838
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1839
exitcode = EX_OSERR;
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1840
1108
#ifdef __linux__
1841
1109
if(restore_loglevel){
1842
1110
ret = klogctl(7, NULL, 0);
1843
1111
if(ret == -1){
1844
perror_plus("klogctl");
1112
perror("klogctl");
1845
1113
}
1846
1114
}
1847
1115
#endif /* __linux__ */
1848
/* Lower privileges */
1849
errno = 0;
1850
ret = seteuid(uid);
1851
if(ret == -1){
1852
perror_plus("seteuid");
1853
}
1854
1116
goto end;
1855
1117
}
1856
1118
}
1857
/* Sleep checking until interface is running.
1858
Check every 0.25s, up to total time of delay */
1119
/* sleep checking until interface is running */
1859
1120
for(int i=0; i < delay * 4; i++){
1860
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1861
1122
if(ret == -1){
1862
perror_plus("ioctl SIOCGIFFLAGS");
1123
perror("ioctl SIOCGIFFLAGS");
1863
1124
} else if(network.ifr_flags & IFF_RUNNING){
1864
1125
break;
1865
1126
}
1866
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1867
1128
ret = nanosleep(&sleeptime, NULL);
1868
1129
if(ret == -1 and errno != EINTR){
1869
perror_plus("nanosleep");
1130
perror("nanosleep");
1870
1131
}
1871
1132
}
1872
if(not take_down_interface){
1873
/* We won't need the socket anymore */
1874
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1875
if(ret == -1){
1876
perror_plus("close");
1877
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1878
1136
}
1879
1137
#ifdef __linux__
1880
1138
if(restore_loglevel){
1881
1139
/* Restores kernel loglevel to default */
1882
1140
ret = klogctl(7, NULL, 0);
1883
1141
if(ret == -1){
1884
perror_plus("klogctl");
1142
perror("klogctl");
1885
1143
}
1886
1144
}
1887
1145
#endif /* __linux__ */
1888
/* Lower privileges */
1889
errno = 0;
1890
if(take_down_interface){
1891
/* Lower privileges */
1892
ret = seteuid(uid);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
} else {
1897
/* Lower privileges permanently */
1898
ret = setuid(uid);
1899
if(ret == -1){
1900
perror_plus("setuid");
1901
}
1902
}
1903
}
1904
1905
if(quit_now){
1906
goto end;
1146
}
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
errno = 0;
1152
setgid(gid);
1153
if(ret == -1){
1154
perror("setgid");
1155
}
1156
1157
ret = setuid(uid);
1158
if(ret == -1){
1159
perror("setuid");
1907
1160
}
1908
1161
1909
1162
ret = init_gnutls_global(pubkey, seckey);
1910
1163
if(ret == -1){
1911
1164
fprintf(stderr, "init_gnutls_global failed\n");
1912
exitcode = EX_UNAVAILABLE;
1165
exitcode = EXIT_FAILURE;
1913
1166
goto end;
1914
1167
} else {
1915
1168
gnutls_initialized = true;
1916
1169
}
1917
1170
1918
if(quit_now){
1919
goto end;
1920
}
1921
1922
1171
if(mkdtemp(tempdir) == NULL){
1923
perror_plus("mkdtemp");
1172
perror("mkdtemp");
1924
1173
goto end;
1925
1174
}
1926
1175
tempdir_created = true;
1927
1176
1928
if(quit_now){
1929
goto end;
1930
}
1931
1932
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
1933
1178
fprintf(stderr, "init_gpgme failed\n");
1934
exitcode = EX_UNAVAILABLE;
1179
exitcode = EXIT_FAILURE;
1935
1180
goto end;
1936
1181
} else {
1937
1182
gpgme_initialized = true;
1938
1183
}
1939
1184
1940
if(quit_now){
1941
goto end;
1185
if(interface[0] != '\0'){
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
1187
if(if_index == 0){
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1190
goto end;
1191
}
1942
1192
}
1943
1193
1944
1194
if(connect_to != NULL){
1947
1197
char *address = strrchr(connect_to, ':');
1948
1198
if(address == NULL){
1949
1199
fprintf(stderr, "No colon in address\n");
1950
exitcode = EX_USAGE;
1951
goto end;
1952
}
1953
1954
if(quit_now){
1955
goto end;
1956
}
1957
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
1958
1203
uint16_t port;
1959
1204
errno = 0;
1960
1205
tmpmax = strtoimax(address+1, &tmp, 10);
1961
1206
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1962
1207
or tmpmax != (uint16_t)tmpmax){
1963
1208
fprintf(stderr, "Bad port number\n");
1964
exitcode = EX_USAGE;
1965
goto end;
1966
}
1967
1968
if(quit_now){
1969
goto end;
1970
}
1971
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
1972
1212
port = (uint16_t)tmpmax;
1973
1213
*address = '\0';
1214
address = connect_to;
1974
1215
/* Colon in address indicates IPv6 */
1975
1216
int af;
1976
if(strchr(connect_to, ':') != NULL){
1217
if(strchr(address, ':') != NULL){
1977
1218
af = AF_INET6;
1978
/* Accept [] around IPv6 address - see RFC 5952 */
1979
if(connect_to[0] == '[' and address[-1] == ']')
1980
{
1981
connect_to++;
1982
address[-1] = '\0';
1983
}
1984
1219
} else {
1985
1220
af = AF_INET;
1986
1221
}
1987
address = connect_to;
1988
1989
if(quit_now){
1990
goto end;
1991
}
1992
1993
while(not quit_now){
1994
ret = start_mandos_communication(address, port, if_index, af);
1995
if(quit_now or ret == 0){
1996
break;
1997
}
1998
if(debug){
1999
fprintf(stderr, "Retrying in %d seconds\n",
2000
(int)retry_interval);
2001
}
2002
sleep((int)retry_interval);
2003
}
2004
2005
if (not quit_now){
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
2006
1226
exitcode = EXIT_SUCCESS;
2007
1227
}
1228
goto end;
1229
}
2008
1230
2009
goto end;
2010
}
2011
2012
if(quit_now){
2013
goto end;
2014
}
2015
2016
1231
{
2017
1232
AvahiServerConfig config;
2018
1233
/* Do not publish any local Zeroconf records */
2035
1250
if(mc.server == NULL){
2036
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
2037
1252
avahi_strerror(error));
2038
exitcode = EX_UNAVAILABLE;
2039
goto end;
2040
}
2041
2042
if(quit_now){
1253
exitcode = EXIT_FAILURE;
2043
1254
goto end;
2044
1255
}
2045
1256
2050
1261
if(sb == NULL){
2051
1262
fprintf(stderr, "Failed to create service browser: %s\n",
2052
1263
avahi_strerror(avahi_server_errno(mc.server)));
2053
exitcode = EX_UNAVAILABLE;
2054
goto end;
2055
}
2056
2057
if(quit_now){
1264
exitcode = EXIT_FAILURE;
2058
1265
goto end;
2059
1266
}
2060
1267
2063
1270
if(debug){
2064
1271
fprintf(stderr, "Starting Avahi loop search\n");
2065
1272
}
2066
2067
ret = avahi_loop_with_timeout(mc.simple_poll,
2068
(int)(retry_interval * 1000));
2069
if(debug){
2070
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2071
(ret == 0) ? "successfully" : "with error");
2072
}
1273
1274
avahi_simple_poll_loop(mc.simple_poll);
2073
1275
2074
1276
end:
2075
1277
2096
1298
if(gpgme_initialized){
2097
1299
gpgme_release(mc.ctx);
2098
1300
}
2099
2100
/* Cleans up the circular linked list of Mandos servers the client
2101
has seen */
2102
if(mc.current_server != NULL){
2103
mc.current_server->prev->next = NULL;
2104
while(mc.current_server != NULL){
2105
server *next = mc.current_server->next;
2106
free(mc.current_server);
2107
mc.current_server = next;
2108
}
2109
}
2110
2111
/* XXX run network hooks "stop" here */
2112
2113
/* Take down the network interface */
2114
if(take_down_interface){
2115
/* Re-raise priviliges */
2116
errno = 0;
2117
ret = seteuid(0);
2118
if(ret == -1){
2119
perror_plus("seteuid");
2120
}
2121
if(geteuid() == 0){
2122
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2123
if(ret == -1){
2124
perror_plus("ioctl SIOCGIFFLAGS");
2125
} else if(network.ifr_flags & IFF_UP) {
2126
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2127
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2128
if(ret == -1){
2129
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2130
}
2131
}
2132
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2133
if(ret == -1){
2134
perror_plus("close");
2135
}
2136
/* Lower privileges permanently */
2137
errno = 0;
2138
ret = setuid(uid);
2139
if(ret == -1){
2140
perror_plus("setuid");
2141
}
2142
}
2143
}
2144
2145
/* Removes the GPGME temp directory and all files inside */
1301
1302
/* Removes the temp directory used by GPGME */
2146
1303
if(tempdir_created){
2147
struct dirent **direntries = NULL;
2148
struct dirent *direntry = NULL;
2149
int numentries = scandir(tempdir, &direntries, notdotentries,
2150
alphasort);
2151
if (numentries > 0){
2152
for(int i = 0; i < numentries; i++){
2153
direntry = direntries[i];
1304
DIR *d;
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1307
if(d == NULL){
1308
if(errno != ENOENT){
1309
perror("opendir");
1310
}
1311
} else {
1312
while(true){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1315
break;
1316
}
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1322
continue;
1323
}
2154
1324
char *fullname = NULL;
2155
1325
ret = asprintf(&fullname, "%s/%s", tempdir,
2156
1326
direntry->d_name);
2157
1327
if(ret < 0){
2158
perror_plus("asprintf");
1328
perror("asprintf");
2159
1329
continue;
2160
1330
}
2161
1331
ret = remove(fullname);
2165
1335
}
2166
1336
free(fullname);
2167
1337
}
2168
}
2169
2170
/* need to clean even if 0 because man page doesn't specify */
2171
free(direntries);
2172
if (numentries == -1){
2173
perror_plus("scandir");
1338
closedir(d);
2174
1339
}
2175
1340
ret = rmdir(tempdir);
2176
1341
if(ret == -1 and errno != ENOENT){
2177
perror_plus("rmdir");
2178
}
2179
}
2180
2181
if(quit_now){
2182
sigemptyset(&old_sigterm_action.sa_mask);
2183
old_sigterm_action.sa_handler = SIG_DFL;
2184
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2185
&old_sigterm_action,
2186
NULL));
2187
if(ret == -1){
2188
perror_plus("sigaction");
2189
}
2190
do {
2191
ret = raise(signal_received);
2192
} while(ret != 0 and errno == EINTR);
2193
if(ret != 0){
2194
perror_plus("raise");
2195
abort();
2196
}
2197
TEMP_FAILURE_RETRY(pause());
1342
perror("rmdir");
1343
}
2198
1344
}
2199
1345
2200
1346
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0