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237.2.157
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-10-24 19:17:52 UTC
- mto: (24.1.146 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: teddy@fukt.bsnet.se-20091024191752-7g6xlf6wpp2pdexb
Convert some programs to use the exit codes from <sysexits.h>. Change
all programs using the "argp" parsing functions to use them correctly;
checking return value, using argp_error() to report parse errors etc.
* plugin-runner.c: Use <sysexits.h> exit codes. Always use fallback,
even on option errors, except for "--help", etc.
(getplugin): Make sure "errno" is set correctly on return.
(main): Declare our own "--help", "--usage", and "--version"
options which do not cause the fallback to be invoked.
In all other options, use fallback on any error.
(parse_opt, parse_opt_config_file): Reset errno at start and return
errno. No need to check "arg"
for NULL. New "--help",
"--usage", and "--version"
options.
(parse_opt): Accept empty string as global option. Do not print
errors which will be detected and reported later. Do
"argp_error()" on parse error or empty plugin names.
* plugins.d/mandos-client.c: Use <sysexits.h> exit codes. Do not
return successful exit code on "--help",
etc. since this would give the wrong
message to "plugin-runner".
(main): Declare our own "--help", "--usage", and "--version"
options which do not return a successful exit code.
(parse_opt): Reset errno at start and return errno. Do
"argp_error()" on parse errors. New "--help",
"--usage", and "--version" options.
* plugins.d/password-prompt.c: Use exit codes from <sysexits.h>. Do
not return successful exit code on
"--help", etc. since this would give
the wrong message to "plugin-runner".
(main): Declare our own "--help", "--usage", and "--version" options
which do not return a successful exit code. Do
close(STDOUT_FILENO) after writing to check its return code.
(parse_opt): Reset errno at start and return errno.
all programs using the "argp" parsing functions to use them correctly;
checking return value, using argp_error() to report parse errors etc.
* plugin-runner.c: Use <sysexits.h> exit codes. Always use fallback,
even on option errors, except for "--help", etc.
(getplugin): Make sure "errno" is set correctly on return.
(main): Declare our own "--help", "--usage", and "--version"
options which do not cause the fallback to be invoked.
In all other options, use fallback on any error.
(parse_opt, parse_opt_config_file): Reset errno at start and return
errno. No need to check "arg"
for NULL. New "--help",
"--usage", and "--version"
options.
(parse_opt): Accept empty string as global option. Do not print
errors which will be detected and reported later. Do
"argp_error()" on parse error or empty plugin names.
* plugins.d/mandos-client.c: Use <sysexits.h> exit codes. Do not
return successful exit code on "--help",
etc. since this would give the wrong
message to "plugin-runner".
(main): Declare our own "--help", "--usage", and "--version"
options which do not return a successful exit code.
(parse_opt): Reset errno at start and return errno. Do
"argp_error()" on parse errors. New "--help",
"--usage", and "--version" options.
* plugins.d/password-prompt.c: Use exit codes from <sysexits.h>. Do
not return successful exit code on
"--help", etc. since this would give
the wrong message to "plugin-runner".
(main): Declare our own "--help", "--usage", and "--version" options
which do not return a successful exit code. Do
close(STDOUT_FILENO) after writing to check its return code.
(parse_opt): Reset errno at start and return errno.
- files modified:
- INSTALL
added
removed
plugins.d/mandos-client.c
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
43
stdout, ferror(), remove() */
41
44
#include <stdint.h> /* uint16_t, uint32_t */
42
45
#include <stddef.h> /* NULL, size_t, ssize_t */
43
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
47
srand(), strtof(), abort() */
45
48
#include <stdbool.h> /* bool, false, true */
46
49
#include <string.h> /* memset(), strcmp(), strlen(),
47
50
strerror(), asprintf(), strcpy() */
56
59
#include <fcntl.h> /* open() */
57
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
58
61
*/
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
60
64
#include <assert.h> /* assert() */
61
65
#include <errno.h> /* perror(), errno */
62
66
#include <time.h> /* nanosleep(), time() */
67
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
72
*/
69
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
72
76
#include <arpa/inet.h> /* inet_pton(), htons */
73
77
#include <iso646.h> /* not, or, and */
74
78
#include <argp.h> /* struct argp_option, error_t, struct
76
80
argp_parse(), ARGP_KEY_ARG,
77
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
82
#include <signal.h> /* sigemptyset(), sigaddset(),
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
81
86
82
87
#ifdef __linux__
83
88
#include <sys/klog.h> /* klogctl() */
134
139
} mandos_context;
135
140
136
141
/* global context so signal handler can reach it*/
137
mandos_context mc;
142
mandos_context mc = { .simple_poll = NULL, .server = NULL,
143
.dh_bits = 1024, .priority = "SECURE256"
144
":!CTYPE-X.509:+CTYPE-OPENPGP" };
145
146
sig_atomic_t quit_now = 0;
147
int signal_received = 0;
138
148
139
149
/*
140
150
* Make additional room in "buffer" for at least BUFFER_SIZE more
158
168
*/
159
169
static bool init_gpgme(const char *seckey,
160
170
const char *pubkey, const char *tempdir){
161
int ret;
162
171
gpgme_error_t rc;
163
172
gpgme_engine_info_t engine_info;
164
173
167
176
* Helper function to insert pub and seckey to the engine keyring.
168
177
*/
169
178
bool import_key(const char *filename){
179
int ret;
170
180
int fd;
171
181
gpgme_data_t pgp_data;
172
182
243
253
return false;
244
254
}
245
255
246
return true;
256
return true;
247
257
}
248
258
249
259
/*
303
313
}
304
314
gpgme_recipient_t recipient;
305
315
recipient = result->recipients;
306
if(recipient){
307
while(recipient != NULL){
308
fprintf(stderr, "Public key algorithm: %s\n",
309
gpgme_pubkey_algo_name(recipient->pubkey_algo));
310
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
311
fprintf(stderr, "Secret key available: %s\n",
312
recipient->status == GPG_ERR_NO_SECKEY
313
? "No" : "Yes");
314
recipient = recipient->next;
315
}
316
while(recipient != NULL){
317
fprintf(stderr, "Public key algorithm: %s\n",
318
gpgme_pubkey_algo_name(recipient->pubkey_algo));
319
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
320
fprintf(stderr, "Secret key available: %s\n",
321
recipient->status == GPG_ERR_NO_SECKEY
322
? "No" : "Yes");
323
recipient = recipient->next;
316
324
}
317
325
}
318
326
}
470
478
static int init_gnutls_session(gnutls_session_t *session){
471
479
int ret;
472
480
/* GnuTLS session creation */
473
ret = gnutls_init(session, GNUTLS_SERVER);
481
do {
482
ret = gnutls_init(session, GNUTLS_SERVER);
483
if(quit_now){
484
return -1;
485
}
486
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
474
487
if(ret != GNUTLS_E_SUCCESS){
475
488
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
476
489
safer_gnutls_strerror(ret));
478
491
479
492
{
480
493
const char *err;
481
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
494
do {
495
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
496
if(quit_now){
497
gnutls_deinit(*session);
498
return -1;
499
}
500
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
482
501
if(ret != GNUTLS_E_SUCCESS){
483
502
fprintf(stderr, "Syntax error at: %s\n", err);
484
503
fprintf(stderr, "GnuTLS error: %s\n",
488
507
}
489
508
}
490
509
491
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
492
mc.cred);
510
do {
511
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
512
mc.cred);
513
if(quit_now){
514
gnutls_deinit(*session);
515
return -1;
516
}
517
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
493
518
if(ret != GNUTLS_E_SUCCESS){
494
519
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
495
520
safer_gnutls_strerror(ret));
498
523
}
499
524
500
525
/* ignore client certificate if any. */
501
gnutls_certificate_server_set_request(*session,
502
GNUTLS_CERT_IGNORE);
526
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
503
527
504
528
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
505
529
514
538
static int start_mandos_communication(const char *ip, uint16_t port,
515
539
AvahiIfIndex if_index,
516
540
int af){
517
int ret, tcp_sd;
541
int ret, tcp_sd = -1;
518
542
ssize_t sret;
519
543
union {
520
544
struct sockaddr_in in;
521
545
struct sockaddr_in6 in6;
522
546
} to;
523
547
char *buffer = NULL;
524
char *decrypted_buffer;
548
char *decrypted_buffer = NULL;
525
549
size_t buffer_length = 0;
526
550
size_t buffer_capacity = 0;
527
ssize_t decrypted_buffer_size;
528
551
size_t written;
529
int retval = 0;
552
int retval = -1;
530
553
gnutls_session_t session;
531
554
int pf; /* Protocol family */
532
555
556
if(quit_now){
557
return -1;
558
}
559
533
560
switch(af){
534
561
case AF_INET6:
535
562
pf = PF_INET6;
555
582
tcp_sd = socket(pf, SOCK_STREAM, 0);
556
583
if(tcp_sd < 0){
557
584
perror("socket");
558
return -1;
585
goto mandos_end;
586
}
587
588
if(quit_now){
589
goto mandos_end;
559
590
}
560
591
561
592
memset(&to, 0, sizeof(to));
562
593
if(af == AF_INET6){
563
to.in6.sin6_family = (uint16_t)af;
594
to.in6.sin6_family = (sa_family_t)af;
564
595
ret = inet_pton(af, ip, &to.in6.sin6_addr);
565
596
} else { /* IPv4 */
566
597
to.in.sin_family = (sa_family_t)af;
568
599
}
569
600
if(ret < 0 ){
570
601
perror("inet_pton");
571
return -1;
602
goto mandos_end;
572
603
}
573
604
if(ret == 0){
574
605
fprintf(stderr, "Bad address: %s\n", ip);
575
return -1;
606
goto mandos_end;
576
607
}
577
608
if(af == AF_INET6){
578
609
to.in6.sin6_port = htons(port); /* Spurious warnings from
585
616
if(if_index == AVAHI_IF_UNSPEC){
586
617
fprintf(stderr, "An IPv6 link-local address is incomplete"
587
618
" without a network interface\n");
588
return -1;
619
goto mandos_end;
589
620
}
590
621
/* Set the network interface number as scope */
591
622
to.in6.sin6_scope_id = (uint32_t)if_index;
596
627
-Wunreachable-code */
597
628
}
598
629
630
if(quit_now){
631
goto mandos_end;
632
}
633
599
634
if(debug){
600
635
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
601
636
char interface[IF_NAMESIZE];
628
663
}
629
664
}
630
665
666
if(quit_now){
667
goto mandos_end;
668
}
669
631
670
if(af == AF_INET6){
632
671
ret = connect(tcp_sd, &to.in6, sizeof(to));
633
672
} else {
635
674
}
636
675
if(ret < 0){
637
676
perror("connect");
638
return -1;
677
goto mandos_end;
678
}
679
680
if(quit_now){
681
goto mandos_end;
639
682
}
640
683
641
684
const char *out = mandos_protocol_version;
646
689
out_size - written));
647
690
if(ret == -1){
648
691
perror("write");
649
retval = -1;
650
692
goto mandos_end;
651
693
}
652
694
written += (size_t)ret;
660
702
break;
661
703
}
662
704
}
705
706
if(quit_now){
707
goto mandos_end;
708
}
663
709
}
664
710
665
711
if(debug){
666
712
fprintf(stderr, "Establishing TLS session with %s\n", ip);
667
713
}
668
714
715
if(quit_now){
716
goto mandos_end;
717
}
718
669
719
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
670
720
671
do{
721
if(quit_now){
722
goto mandos_end;
723
}
724
725
do {
672
726
ret = gnutls_handshake(session);
727
if(quit_now){
728
goto mandos_end;
729
}
673
730
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
674
731
675
732
if(ret != GNUTLS_E_SUCCESS){
677
734
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
678
735
gnutls_perror(ret);
679
736
}
680
retval = -1;
681
737
goto mandos_end;
682
738
}
683
739
689
745
}
690
746
691
747
while(true){
748
749
if(quit_now){
750
goto mandos_end;
751
}
752
692
753
buffer_capacity = incbuffer(&buffer, buffer_length,
693
754
buffer_capacity);
694
755
if(buffer_capacity == 0){
695
756
perror("incbuffer");
696
retval = -1;
757
goto mandos_end;
758
}
759
760
if(quit_now){
697
761
goto mandos_end;
698
762
}
699
763
708
772
case GNUTLS_E_AGAIN:
709
773
break;
710
774
case GNUTLS_E_REHANDSHAKE:
711
do{
775
do {
712
776
ret = gnutls_handshake(session);
777
778
if(quit_now){
779
goto mandos_end;
780
}
713
781
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
714
782
if(ret < 0){
715
783
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
716
784
gnutls_perror(ret);
717
retval = -1;
718
785
goto mandos_end;
719
786
}
720
787
break;
721
788
default:
722
789
fprintf(stderr, "Unknown error while reading data from"
723
790
" encrypted session with Mandos server\n");
724
retval = -1;
725
791
gnutls_bye(session, GNUTLS_SHUT_RDWR);
726
792
goto mandos_end;
727
793
}
734
800
fprintf(stderr, "Closing TLS session\n");
735
801
}
736
802
737
gnutls_bye(session, GNUTLS_SHUT_RDWR);
803
if(quit_now){
804
goto mandos_end;
805
}
806
807
do {
808
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
809
if(quit_now){
810
goto mandos_end;
811
}
812
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
738
813
739
814
if(buffer_length > 0){
815
ssize_t decrypted_buffer_size;
740
816
decrypted_buffer_size = pgp_packet_decrypt(buffer,
741
817
buffer_length,
742
818
&decrypted_buffer);
743
819
if(decrypted_buffer_size >= 0){
820
744
821
written = 0;
745
822
while(written < (size_t) decrypted_buffer_size){
823
if(quit_now){
824
goto mandos_end;
825
}
826
746
827
ret = (int)fwrite(decrypted_buffer + written, 1,
747
828
(size_t)decrypted_buffer_size - written,
748
829
stdout);
751
832
fprintf(stderr, "Error writing encrypted data: %s\n",
752
833
strerror(errno));
753
834
}
754
retval = -1;
755
break;
835
goto mandos_end;
756
836
}
757
837
written += (size_t)ret;
758
838
}
759
free(decrypted_buffer);
760
} else {
761
retval = -1;
839
retval = 0;
762
840
}
763
} else {
764
retval = -1;
765
841
}
766
842
767
843
/* Shutdown procedure */
768
844
769
845
mandos_end:
846
free(decrypted_buffer);
770
847
free(buffer);
771
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
848
if(tcp_sd >= 0){
849
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
850
}
772
851
if(ret == -1){
773
852
perror("close");
774
853
}
775
854
gnutls_deinit(session);
855
if(quit_now){
856
retval = -1;
857
}
776
858
return retval;
777
859
}
778
860
795
877
/* Called whenever a service has been resolved successfully or
796
878
timed out */
797
879
880
if(quit_now){
881
return;
882
}
883
798
884
switch(event){
799
885
default:
800
886
case AVAHI_RESOLVER_FAILURE:
837
923
/* Called whenever a new services becomes available on the LAN or
838
924
is removed from the LAN */
839
925
926
if(quit_now){
927
return;
928
}
929
840
930
switch(event){
841
931
default:
842
932
case AVAHI_BROWSER_FAILURE:
852
942
the callback function is called the Avahi server will free the
853
943
resolver for us. */
854
944
855
if(!(avahi_s_service_resolver_new(mc.server, interface,
856
protocol, name, type, domain,
857
AVAHI_PROTO_INET6, 0,
858
resolve_callback, NULL)))
945
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
946
name, type, domain, protocol, 0,
947
resolve_callback, NULL) == NULL)
859
948
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
860
949
name, avahi_strerror(avahi_server_errno(mc.server)));
861
950
break;
872
961
}
873
962
}
874
963
875
sig_atomic_t quit_now = 0;
876
877
static void handle_sigterm(__attribute__((unused)) int sig){
964
/* stop main loop after sigterm has been called */
965
static void handle_sigterm(int sig){
878
966
if(quit_now){
879
967
return;
880
968
}
881
969
quit_now = 1;
970
signal_received = sig;
882
971
int old_errno = errno;
883
972
if(mc.simple_poll != NULL){
884
973
avahi_simple_poll_quit(mc.simple_poll);
891
980
int error;
892
981
int ret;
893
982
intmax_t tmpmax;
894
int numchars;
983
char *tmp;
895
984
int exitcode = EXIT_SUCCESS;
896
985
const char *interface = "eth0";
897
986
struct ifreq network;
898
int sd;
987
int sd = -1;
988
bool take_down_interface = false;
899
989
uid_t uid;
900
990
gid_t gid;
901
991
char *connect_to = NULL;
905
995
const char *seckey = PATHDIR "/" SECKEY;
906
996
const char *pubkey = PATHDIR "/" PUBKEY;
907
997
908
/* Initialize Mandos context */
909
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
910
.dh_bits = 1024, .priority = "SECURE256"
911
":!CTYPE-X.509:+CTYPE-OPENPGP" };
912
998
bool gnutls_initialized = false;
913
999
bool gpgme_initialized = false;
914
double delay = 2.5;
915
916
struct sigaction old_sigterm_action;
1000
float delay = 2.5f;
1001
1002
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
917
1003
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
918
1004
1005
uid = getuid();
1006
gid = getgid();
1007
1008
/* Lower any group privileges we might have, just to be safe */
1009
errno = 0;
1010
ret = setgid(gid);
1011
if(ret == -1){
1012
perror("setgid");
1013
}
1014
1015
/* Lower user privileges (temporarily) */
1016
errno = 0;
1017
ret = seteuid(uid);
1018
if(ret == -1){
1019
perror("seteuid");
1020
}
1021
1022
if(quit_now){
1023
goto end;
1024
}
1025
919
1026
{
920
1027
struct argp_option options[] = {
921
1028
{ .name = "debug", .key = 128,
950
1057
.arg = "SECONDS",
951
1058
.doc = "Maximum delay to wait for interface startup",
952
1059
.group = 2 },
1060
/*
1061
* These reproduce what we would get without ARGP_NO_HELP
1062
*/
1063
{ .name = "help", .key = '?',
1064
.doc = "Give this help list", .group = -1 },
1065
{ .name = "usage", .key = -3,
1066
.doc = "Give a short usage message", .group = -1 },
1067
{ .name = "version", .key = 'V',
1068
.doc = "Print program version", .group = -1 },
953
1069
{ .name = NULL }
954
1070
};
955
1071
956
1072
error_t parse_opt(int key, char *arg,
957
1073
struct argp_state *state){
1074
errno = 0;
958
1075
switch(key){
959
1076
case 128: /* --debug */
960
1077
debug = true;
972
1089
pubkey = arg;
973
1090
break;
974
1091
case 129: /* --dh-bits */
975
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
976
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
977
or arg[numchars] != '\0'){
978
fprintf(stderr, "Bad number of DH bits\n");
979
exit(EXIT_FAILURE);
1092
errno = 0;
1093
tmpmax = strtoimax(arg, &tmp, 10);
1094
if(errno != 0 or tmp == arg or *tmp != '\0'
1095
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1096
argp_error(state, "Bad number of DH bits");
980
1097
}
981
1098
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
982
1099
break;
984
1101
mc.priority = arg;
985
1102
break;
986
1103
case 131: /* --delay */
987
ret = sscanf(arg, "%lf%n", &delay, &numchars);
988
if(ret < 1 or arg[numchars] != '\0'){
989
fprintf(stderr, "Bad delay\n");
990
exit(EXIT_FAILURE);
1104
errno = 0;
1105
delay = strtof(arg, &tmp);
1106
if(errno != 0 or tmp == arg or *tmp != '\0'){
1107
argp_error(state, "Bad delay");
991
1108
}
992
1109
break;
993
case ARGP_KEY_ARG:
994
argp_usage(state);
995
case ARGP_KEY_END:
1110
/*
1111
* These reproduce what we would get without ARGP_NO_HELP
1112
*/
1113
case '?': /* --help */
1114
argp_state_help(state, state->out_stream,
1115
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1116
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1117
case -3: /* --usage */
1118
argp_state_help(state, state->out_stream,
1119
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1120
case 'V': /* --version */
1121
fprintf(state->out_stream, "%s\n", argp_program_version);
1122
exit(argp_err_exit_status);
996
1123
break;
997
1124
default:
998
1125
return ARGP_ERR_UNKNOWN;
999
1126
}
1000
return 0;
1127
return errno;
1001
1128
}
1002
1129
1003
1130
struct argp argp = { .options = options, .parser = parse_opt,
1004
1131
.args_doc = "",
1005
1132
.doc = "Mandos client -- Get and decrypt"
1006
1133
" passwords from a Mandos server" };
1007
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1008
if(ret == ARGP_ERR_UNKNOWN){
1009
fprintf(stderr, "Unknown error while parsing arguments\n");
1134
ret = argp_parse(&argp, argc, argv,
1135
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1136
switch(ret){
1137
case 0:
1138
break;
1139
case ENOMEM:
1140
default:
1141
errno = ret;
1142
perror("argp_parse");
1143
exitcode = EX_OSERR;
1144
goto end;
1145
case EINVAL:
1146
exitcode = EX_USAGE;
1147
goto end;
1148
}
1149
}
1150
1151
if(not debug){
1152
avahi_set_log_function(empty_log);
1153
}
1154
1155
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1156
from the signal handler */
1157
/* Initialize the pseudo-RNG for Avahi */
1158
srand((unsigned int) time(NULL));
1159
mc.simple_poll = avahi_simple_poll_new();
1160
if(mc.simple_poll == NULL){
1161
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1162
exitcode = EXIT_FAILURE;
1163
goto end;
1164
}
1165
1166
sigemptyset(&sigterm_action.sa_mask);
1167
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1168
if(ret == -1){
1169
perror("sigaddset");
1170
exitcode = EXIT_FAILURE;
1171
goto end;
1172
}
1173
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1174
if(ret == -1){
1175
perror("sigaddset");
1176
exitcode = EXIT_FAILURE;
1177
goto end;
1178
}
1179
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1180
if(ret == -1){
1181
perror("sigaddset");
1182
exitcode = EXIT_FAILURE;
1183
goto end;
1184
}
1185
/* Need to check if the handler is SIG_IGN before handling:
1186
| [[info:libc:Initial Signal Actions]] |
1187
| [[info:libc:Basic Signal Handling]] |
1188
*/
1189
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1190
if(ret == -1){
1191
perror("sigaction");
1192
return EXIT_FAILURE;
1193
}
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
ret = sigaction(SIGINT, &sigterm_action, NULL);
1196
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1199
goto end;
1200
}
1201
}
1202
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1203
if(ret == -1){
1204
perror("sigaction");
1205
return EXIT_FAILURE;
1206
}
1207
if(old_sigterm_action.sa_handler != SIG_IGN){
1208
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1209
if(ret == -1){
1210
perror("sigaction");
1211
exitcode = EXIT_FAILURE;
1212
goto end;
1213
}
1214
}
1215
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1216
if(ret == -1){
1217
perror("sigaction");
1218
return EXIT_FAILURE;
1219
}
1220
if(old_sigterm_action.sa_handler != SIG_IGN){
1221
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1222
if(ret == -1){
1223
perror("sigaction");
1010
1224
exitcode = EXIT_FAILURE;
1011
1225
goto end;
1012
1226
}
1014
1228
1015
1229
/* If the interface is down, bring it up */
1016
1230
if(interface[0] != '\0'){
1231
if_index = (AvahiIfIndex) if_nametoindex(interface);
1232
if(if_index == 0){
1233
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1234
exitcode = EXIT_FAILURE;
1235
goto end;
1236
}
1237
1238
if(quit_now){
1239
goto end;
1240
}
1241
1242
/* Re-raise priviliges */
1243
errno = 0;
1244
ret = seteuid(0);
1245
if(ret == -1){
1246
perror("seteuid");
1247
}
1248
1017
1249
#ifdef __linux__
1018
1250
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1019
messages to mess up the prompt */
1251
messages about the network interface to mess up the prompt */
1020
1252
ret = klogctl(8, NULL, 5);
1021
1253
bool restore_loglevel = true;
1022
1254
if(ret == -1){
1037
1269
}
1038
1270
}
1039
1271
#endif /* __linux__ */
1272
/* Lower privileges */
1273
errno = 0;
1274
ret = seteuid(uid);
1275
if(ret == -1){
1276
perror("seteuid");
1277
}
1040
1278
goto end;
1041
1279
}
1042
1280
strcpy(network.ifr_name, interface);
1052
1290
}
1053
1291
#endif /* __linux__ */
1054
1292
exitcode = EXIT_FAILURE;
1293
/* Lower privileges */
1294
errno = 0;
1295
ret = seteuid(uid);
1296
if(ret == -1){
1297
perror("seteuid");
1298
}
1055
1299
goto end;
1056
1300
}
1057
1301
if((network.ifr_flags & IFF_UP) == 0){
1058
1302
network.ifr_flags |= IFF_UP;
1303
take_down_interface = true;
1059
1304
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1060
1305
if(ret == -1){
1306
take_down_interface = false;
1061
1307
perror("ioctl SIOCSIFFLAGS");
1062
1308
exitcode = EXIT_FAILURE;
1063
1309
#ifdef __linux__
1068
1314
}
1069
1315
}
1070
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1071
1323
goto end;
1072
1324
}
1073
1325
}
1085
1337
perror("nanosleep");
1086
1338
}
1087
1339
}
1088
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1089
if(ret == -1){
1090
perror("close");
1340
if(not take_down_interface){
1341
/* We won't need the socket anymore */
1342
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1343
if(ret == -1){
1344
perror("close");
1345
}
1091
1346
}
1092
1347
#ifdef __linux__
1093
1348
if(restore_loglevel){
1098
1353
}
1099
1354
}
1100
1355
#endif /* __linux__ */
1101
}
1102
1103
uid = getuid();
1104
gid = getgid();
1105
1106
errno = 0;
1107
setgid(gid);
1108
if(ret == -1){
1109
perror("setgid");
1110
}
1111
1112
ret = setuid(uid);
1113
if(ret == -1){
1114
perror("setuid");
1356
/* Lower privileges */
1357
errno = 0;
1358
if(take_down_interface){
1359
/* Lower privileges */
1360
ret = seteuid(uid);
1361
if(ret == -1){
1362
perror("seteuid");
1363
}
1364
} else {
1365
/* Lower privileges permanently */
1366
ret = setuid(uid);
1367
if(ret == -1){
1368
perror("setuid");
1369
}
1370
}
1371
}
1372
1373
if(quit_now){
1374
goto end;
1115
1375
}
1116
1376
1117
1377
ret = init_gnutls_global(pubkey, seckey);
1123
1383
gnutls_initialized = true;
1124
1384
}
1125
1385
1386
if(quit_now){
1387
goto end;
1388
}
1389
1390
tempdir_created = true;
1126
1391
if(mkdtemp(tempdir) == NULL){
1392
tempdir_created = false;
1127
1393
perror("mkdtemp");
1128
1394
goto end;
1129
1395
}
1130
tempdir_created = true;
1396
1397
if(quit_now){
1398
goto end;
1399
}
1131
1400
1132
1401
if(not init_gpgme(pubkey, seckey, tempdir)){
1133
1402
fprintf(stderr, "init_gpgme failed\n");
1137
1406
gpgme_initialized = true;
1138
1407
}
1139
1408
1140
if(interface[0] != '\0'){
1141
if_index = (AvahiIfIndex) if_nametoindex(interface);
1142
if(if_index == 0){
1143
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1144
exitcode = EXIT_FAILURE;
1145
goto end;
1146
}
1409
if(quit_now){
1410
goto end;
1147
1411
}
1148
1412
1149
1413
if(connect_to != NULL){
1155
1419
exitcode = EXIT_FAILURE;
1156
1420
goto end;
1157
1421
}
1422
1423
if(quit_now){
1424
goto end;
1425
}
1426
1158
1427
uint16_t port;
1159
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1160
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1161
or address[numchars+1] != '\0'){
1428
errno = 0;
1429
tmpmax = strtoimax(address+1, &tmp, 10);
1430
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1431
or tmpmax != (uint16_t)tmpmax){
1162
1432
fprintf(stderr, "Bad port number\n");
1163
1433
exitcode = EXIT_FAILURE;
1164
1434
goto end;
1165
1435
}
1436
1437
if(quit_now){
1438
goto end;
1439
}
1440
1166
1441
port = (uint16_t)tmpmax;
1167
1442
*address = '\0';
1168
1443
address = connect_to;
1173
1448
} else {
1174
1449
af = AF_INET;
1175
1450
}
1451
1452
if(quit_now){
1453
goto end;
1454
}
1455
1176
1456
ret = start_mandos_communication(address, port, if_index, af);
1177
1457
if(ret < 0){
1178
1458
exitcode = EXIT_FAILURE;
1182
1462
goto end;
1183
1463
}
1184
1464
1185
if(not debug){
1186
avahi_set_log_function(empty_log);
1187
}
1188
1189
/* Initialize the pseudo-RNG for Avahi */
1190
srand((unsigned int) time(NULL));
1191
1192
/* Allocate main Avahi loop object */
1193
mc.simple_poll = avahi_simple_poll_new();
1194
if(mc.simple_poll == NULL){
1195
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1196
exitcode = EXIT_FAILURE;
1465
if(quit_now){
1197
1466
goto end;
1198
1467
}
1199
1468
1223
1492
goto end;
1224
1493
}
1225
1494
1495
if(quit_now){
1496
goto end;
1497
}
1498
1226
1499
/* Create the Avahi service browser */
1227
1500
sb = avahi_s_service_browser_new(mc.server, if_index,
1228
AVAHI_PROTO_INET6, "_mandos._tcp",
1501
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1229
1502
NULL, 0, browse_callback, NULL);
1230
1503
if(sb == NULL){
1231
1504
fprintf(stderr, "Failed to create service browser: %s\n",
1234
1507
goto end;
1235
1508
}
1236
1509
1237
sigemptyset(&sigterm_action.sa_mask);
1238
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1239
if(ret == -1){
1240
perror("sigaddset");
1241
exitcode = EXIT_FAILURE;
1242
goto end;
1243
}
1244
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1245
if(ret == -1){
1246
perror("sigaddset");
1247
exitcode = EXIT_FAILURE;
1248
goto end;
1249
}
1250
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1251
if(ret == -1){
1252
perror("sigaddset");
1253
exitcode = EXIT_FAILURE;
1254
goto end;
1255
}
1256
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1257
if(ret == -1){
1258
perror("sigaction");
1259
exitcode = EXIT_FAILURE;
1260
goto end;
1261
}
1510
if(quit_now){
1511
goto end;
1512
}
1262
1513
1263
1514
/* Run the main loop */
1264
1515
1294
1545
gpgme_release(mc.ctx);
1295
1546
}
1296
1547
1548
/* Take down the network interface */
1549
if(take_down_interface){
1550
/* Re-raise priviliges */
1551
errno = 0;
1552
ret = seteuid(0);
1553
if(ret == -1){
1554
perror("seteuid");
1555
}
1556
if(geteuid() == 0){
1557
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1558
if(ret == -1){
1559
perror("ioctl SIOCGIFFLAGS");
1560
} else if(network.ifr_flags & IFF_UP) {
1561
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1562
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1563
if(ret == -1){
1564
perror("ioctl SIOCSIFFLAGS");
1565
}
1566
}
1567
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1568
if(ret == -1){
1569
perror("close");
1570
}
1571
/* Lower privileges permanently */
1572
errno = 0;
1573
ret = setuid(uid);
1574
if(ret == -1){
1575
perror("setuid");
1576
}
1577
}
1578
}
1579
1297
1580
/* Removes the temp directory used by GPGME */
1298
1581
if(tempdir_created){
1299
1582
DIR *d;
1338
1621
}
1339
1622
}
1340
1623
1624
if(quit_now){
1625
sigemptyset(&old_sigterm_action.sa_mask);
1626
old_sigterm_action.sa_handler = SIG_DFL;
1627
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1628
&old_sigterm_action,
1629
NULL));
1630
if(ret == -1){
1631
perror("sigaction");
1632
}
1633
do {
1634
ret = raise(signal_received);
1635
} while(ret != 0 and errno == EINTR);
1636
if(ret != 0){
1637
perror("raise");
1638
abort();
1639
}
1640
TEMP_FAILURE_RETRY(pause());
1641
}
1642
1341
1643
return exitcode;
1342
1644
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0