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- Committer: Teddy Hogeborn
- Date: 2009-01-10 05:41:16 UTC
- mfrom: (237.2.23 mandos)
- Revision ID: teddy@fukt.bsnet.se-20090110054116-uu1tbhe33sl5zg31
Merge from trunk; fix compilation error on AMD64.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- 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 © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
47
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
49
sockaddr_in6, PF_INET6,
49
50
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
51
uid_t, gid_t, open(), opendir(), DIR */
52
#include <sys/stat.h> /* open() */
52
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
54
struct in6_addr, inet_pton(),
54
55
connect() */
56
#include <fcntl.h> /* open() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir() */
58
#include <inttypes.h> /* PRIu16 */
55
59
#include <assert.h> /* assert() */
56
60
#include <errno.h> /* perror(), errno */
57
61
#include <time.h> /* time() */
58
62
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
63
SIOCSIFFLAGS, if_indextoname(),
60
64
if_nametoindex(), IF_NAMESIZE */
65
#include <netinet/in.h>
61
66
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
67
getuid(), getgid(), setuid(),
63
68
setgid() */
64
#include <netinet/in.h>
65
69
#include <arpa/inet.h> /* inet_pton(), htons */
66
70
#include <iso646.h> /* not, and */
67
71
#include <argp.h> /* struct argp_option, error_t, struct
98
102
99
103
#define BUFFER_SIZE 256
100
104
105
#define PATHDIR "/conf/conf.d/mandos"
106
#define SECKEY "seckey.txt"
107
#define PUBKEY "pubkey.txt"
108
101
109
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
110
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
111
const char *argp_program_version = "mandos-client " VERSION;
105
112
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
106
113
107
114
/* Used for passing in values through the Avahi callback functions */
112
119
unsigned int dh_bits;
113
120
gnutls_dh_params_t dh_params;
114
121
const char *priority;
122
gpgme_ctx_t ctx;
115
123
} mandos_context;
116
124
117
125
/*
132
140
}
133
141
134
142
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
143
* Initialize GPGME.
137
144
*/
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
143
gpgme_ctx_t ctx;
145
static bool init_gpgme(mandos_context *mc, const char *seckey,
146
const char *pubkey, const char *tempdir){
147
int ret;
144
148
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
149
gpgme_engine_info_t engine_info;
149
150
151
152
/*
153
* Helper function to insert pub and seckey to the enigne keyring.
154
*/
155
bool import_key(const char *filename){
156
int fd;
157
gpgme_data_t pgp_data;
158
159
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
160
if(fd == -1){
161
perror("open");
162
return false;
163
}
164
165
rc = gpgme_data_new_from_fd(&pgp_data, fd);
166
if (rc != GPG_ERR_NO_ERROR){
167
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
168
gpgme_strsource(rc), gpgme_strerror(rc));
169
return false;
170
}
171
172
rc = gpgme_op_import(mc->ctx, pgp_data);
173
if (rc != GPG_ERR_NO_ERROR){
174
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
176
return false;
177
}
178
179
ret = (int)TEMP_FAILURE_RETRY(close(fd));
180
if(ret == -1){
181
perror("close");
182
}
183
gpgme_data_release(pgp_data);
184
return true;
185
}
186
150
187
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
188
fprintf(stderr, "Initialize gpgme\n");
152
189
}
153
190
154
191
/* Init GPGME */
157
194
if (rc != GPG_ERR_NO_ERROR){
158
195
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
196
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
197
return false;
161
198
}
162
199
163
/* Set GPGME home directory for the OpenPGP engine only */
200
/* Set GPGME home directory for the OpenPGP engine only */
164
201
rc = gpgme_get_engine_info (&engine_info);
165
202
if (rc != GPG_ERR_NO_ERROR){
166
203
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
204
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
205
return false;
169
206
}
170
207
while(engine_info != NULL){
171
208
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
209
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
210
engine_info->file_name, tempdir);
174
211
break;
175
212
}
176
213
engine_info = engine_info->next;
177
214
}
178
215
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
216
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
217
return false;
218
}
219
220
/* Create new GPGME "context" */
221
rc = gpgme_new(&(mc->ctx));
222
if (rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_new: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
225
return false;
226
}
227
228
if (not import_key(pubkey) or not import_key(seckey)){
229
return false;
230
}
231
232
return true;
233
}
234
235
/*
236
* Decrypt OpenPGP data.
237
* Returns -1 on error
238
*/
239
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
240
const char *cryptotext,
241
size_t crypto_size,
242
char **plaintext){
243
gpgme_data_t dh_crypto, dh_plain;
244
gpgme_error_t rc;
245
ssize_t ret;
246
size_t plaintext_capacity = 0;
247
ssize_t plaintext_length = 0;
248
249
if (debug){
250
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
181
251
}
182
252
183
253
/* Create new GPGME data buffer from memory cryptotext */
198
268
return -1;
199
269
}
200
270
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
207
goto decrypt_end;
208
}
209
210
271
/* Decrypt data from the cryptotext data buffer to the plaintext
211
272
data buffer */
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
273
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
213
274
if (rc != GPG_ERR_NO_ERROR){
214
275
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
276
gpgme_strsource(rc), gpgme_strerror(rc));
216
277
plaintext_length = -1;
217
278
if (debug){
218
279
gpgme_decrypt_result_t result;
219
result = gpgme_op_decrypt_result(ctx);
280
result = gpgme_op_decrypt_result(mc->ctx);
220
281
if (result == NULL){
221
282
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
222
283
} else {
251
312
252
313
/* Seek back to the beginning of the GPGME plaintext data buffer */
253
314
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
315
perror("gpgme_data_seek");
255
316
plaintext_length = -1;
256
317
goto decrypt_end;
257
318
}
281
342
}
282
343
plaintext_length += ret;
283
344
}
284
345
285
346
if(debug){
286
347
fprintf(stderr, "Decrypted password is: ");
287
348
for(ssize_t i = 0; i < plaintext_length; i++){
348
409
}
349
410
350
411
if(debug){
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
412
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
413
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
353
414
seckeyfilename);
354
415
}
355
416
360
421
fprintf(stderr,
361
422
"Error[%d] while reading the OpenPGP key pair ('%s',"
362
423
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
363
fprintf(stdout, "The GnuTLS error is: %s\n",
424
fprintf(stderr, "The GnuTLS error is: %s\n",
364
425
safer_gnutls_strerror(ret));
365
426
goto globalfail;
366
427
}
380
441
}
381
442
382
443
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
383
444
384
445
return 0;
385
446
386
447
globalfail:
387
448
388
449
gnutls_certificate_free_credentials(mc->cred);
389
450
gnutls_global_deinit();
451
gnutls_dh_params_deinit(mc->dh_params);
390
452
return -1;
391
392
453
}
393
454
394
455
static int init_gnutls_session(mandos_context *mc,
440
501
AvahiIfIndex if_index,
441
502
mandos_context *mc){
442
503
int ret, tcp_sd;
504
ssize_t sret;
443
505
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
444
506
char *buffer = NULL;
445
507
char *decrypted_buffer;
466
528
perror("socket");
467
529
return -1;
468
530
}
469
531
470
532
if(debug){
471
533
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
534
perror("if_indextoname");
511
573
perror("connect");
512
574
return -1;
513
575
}
514
576
515
577
const char *out = mandos_protocol_version;
516
578
written = 0;
517
579
while (true){
518
580
size_t out_size = strlen(out);
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
581
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
520
582
out_size - written));
521
583
if (ret == -1){
522
584
perror("write");
535
597
}
536
598
}
537
599
}
538
600
539
601
if(debug){
540
602
fprintf(stderr, "Establishing TLS session with %s\n", ip);
541
603
}
542
604
543
605
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
606
545
607
do{
546
608
ret = gnutls_handshake (session);
547
609
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
561
623
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
562
624
ip);
563
625
}
564
626
565
627
while(true){
566
628
buffer_capacity = adjustbuffer(&buffer, buffer_length,
567
629
buffer_capacity);
571
633
goto mandos_end;
572
634
}
573
635
574
ret = gnutls_record_recv(session, buffer+buffer_length,
575
BUFFER_SIZE);
576
if (ret == 0){
636
sret = gnutls_record_recv(session, buffer+buffer_length,
637
BUFFER_SIZE);
638
if (sret == 0){
577
639
break;
578
640
}
579
if (ret < 0){
580
switch(ret){
641
if (sret < 0){
642
switch(sret){
581
643
case GNUTLS_E_INTERRUPTED:
582
644
case GNUTLS_E_AGAIN:
583
645
break;
600
662
goto mandos_end;
601
663
}
602
664
} else {
603
buffer_length += (size_t) ret;
665
buffer_length += (size_t) sret;
604
666
}
605
667
}
606
668
611
673
gnutls_bye (session, GNUTLS_SHUT_RDWR);
612
674
613
675
if (buffer_length > 0){
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
676
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
615
677
buffer_length,
616
&decrypted_buffer,
617
keydir);
678
&decrypted_buffer);
618
679
if (decrypted_buffer_size >= 0){
619
680
written = 0;
620
681
while(written < (size_t) decrypted_buffer_size){
643
704
644
705
mandos_end:
645
706
free(buffer);
646
close(tcp_sd);
707
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
708
if(ret == -1){
709
perror("close");
710
}
647
711
gnutls_deinit (session);
648
712
return retval;
649
713
}
745
809
}
746
810
}
747
811
748
/* Combines file name and path and returns the malloced new
749
string. some sane checks could/should be added */
750
static char *combinepath(const char *first, const char *second){
751
char *tmp;
752
int ret = asprintf(&tmp, "%s/%s", first, second);
753
if(ret < 0){
754
return NULL;
755
}
756
return tmp;
757
}
758
759
760
812
int main(int argc, char *argv[]){
761
813
AvahiSServiceBrowser *sb = NULL;
762
814
int error;
768
820
uid_t uid;
769
821
gid_t gid;
770
822
char *connect_to = NULL;
823
char tempdir[] = "/tmp/mandosXXXXXX";
771
824
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
772
char *pubkeyfilename = NULL;
773
char *seckeyfilename = NULL;
774
const char *pubkeyname = "pubkey.txt";
775
const char *seckeyname = "seckey.txt";
825
const char *seckey = PATHDIR "/" SECKEY;
826
const char *pubkey = PATHDIR "/" PUBKEY;
827
776
828
mandos_context mc = { .simple_poll = NULL, .server = NULL,
777
.dh_bits = 1024, .priority = "SECURE256"};
829
.dh_bits = 1024, .priority = "SECURE256"
830
":!CTYPE-X.509:+CTYPE-OPENPGP" };
778
831
bool gnutls_initalized = false;
832
bool gpgme_initalized = false;
779
833
780
834
{
781
835
struct argp_option options[] = {
782
836
{ .name = "debug", .key = 128,
783
837
.doc = "Debug mode", .group = 3 },
784
838
{ .name = "connect", .key = 'c',
785
.arg = "IP",
786
.doc = "Connect directly to a sepcified mandos server",
839
.arg = "ADDRESS:PORT",
840
.doc = "Connect directly to a specific Mandos server",
787
841
.group = 1 },
788
842
{ .name = "interface", .key = 'i',
789
.arg = "INTERFACE",
790
.doc = "Interface that Avahi will conntect through",
791
.group = 1 },
792
{ .name = "keydir", .key = 'd',
793
.arg = "KEYDIR",
794
.doc = "Directory where the openpgp keyring is",
843
.arg = "NAME",
844
.doc = "Interface that will be used to search for Mandos"
845
" servers",
795
846
.group = 1 },
796
847
{ .name = "seckey", .key = 's',
797
.arg = "SECKEY",
798
.doc = "Secret openpgp key for gnutls authentication",
848
.arg = "FILE",
849
.doc = "OpenPGP secret key file base name",
799
850
.group = 1 },
800
851
{ .name = "pubkey", .key = 'p',
801
.arg = "PUBKEY",
802
.doc = "Public openpgp key for gnutls authentication",
852
.arg = "FILE",
853
.doc = "OpenPGP public key file base name",
803
854
.group = 2 },
804
855
{ .name = "dh-bits", .key = 129,
805
856
.arg = "BITS",
806
.doc = "dh-bits to use in gnutls communication",
857
.doc = "Bit length of the prime number used in the"
858
" Diffie-Hellman key exchange",
807
859
.group = 2 },
808
860
{ .name = "priority", .key = 130,
809
.arg = "PRIORITY",
810
.doc = "GNUTLS priority", .group = 1 },
861
.arg = "STRING",
862
.doc = "GnuTLS priority string for the TLS handshake",
863
.group = 1 },
811
864
{ .name = NULL }
812
865
};
813
814
866
815
867
error_t parse_opt (int key, char *arg,
816
868
struct argp_state *state) {
817
869
/* Get the INPUT argument from `argp_parse', which we know is
818
870
a pointer to our plugin list pointer. */
819
871
switch (key) {
820
case 128:
872
case 128: /* --debug */
821
873
debug = true;
822
874
break;
823
case 'c':
875
case 'c': /* --connect */
824
876
connect_to = arg;
825
877
break;
826
case 'i':
878
case 'i': /* --interface */
827
879
interface = arg;
828
880
break;
829
case 'd':
830
keydir = arg;
831
break;
832
case 's':
833
seckeyname = arg;
834
break;
835
case 'p':
836
pubkeyname = arg;
837
break;
838
case 129:
881
case 's': /* --seckey */
882
seckey = arg;
883
break;
884
case 'p': /* --pubkey */
885
pubkey = arg;
886
break;
887
case 129: /* --dh-bits */
839
888
errno = 0;
840
889
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
841
890
if (errno){
843
892
exit(EXIT_FAILURE);
844
893
}
845
894
break;
846
case 130:
895
case 130: /* --priority */
847
896
mc.priority = arg;
848
897
break;
849
898
case ARGP_KEY_ARG:
855
904
}
856
905
return 0;
857
906
}
858
907
859
908
struct argp argp = { .options = options, .parser = parse_opt,
860
909
.args_doc = "",
861
910
.doc = "Mandos client -- Get and decrypt"
862
" passwords from mandos server" };
911
" passwords from a Mandos server" };
863
912
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
864
913
if (ret == ARGP_ERR_UNKNOWN){
865
914
fprintf(stderr, "Unknown error while parsing arguments\n");
867
916
goto end;
868
917
}
869
918
}
870
871
pubkeyfilename = combinepath(keydir, pubkeyname);
872
if (pubkeyfilename == NULL){
873
perror("combinepath");
874
exitcode = EXIT_FAILURE;
875
goto end;
876
}
877
878
seckeyfilename = combinepath(keydir, seckeyname);
879
if (seckeyfilename == NULL){
880
perror("combinepath");
881
exitcode = EXIT_FAILURE;
882
goto end;
883
}
884
885
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
886
if (ret == -1){
887
fprintf(stderr, "init_gnutls_global failed\n");
888
exitcode = EXIT_FAILURE;
889
goto end;
890
} else {
891
gnutls_initalized = true;
892
}
893
919
894
920
/* If the interface is down, bring it up */
895
921
{
915
941
goto end;
916
942
}
917
943
}
918
close(sd);
944
ret = (int)TEMP_FAILURE_RETRY(close(sd));
945
if(ret == -1){
946
perror("close");
947
}
919
948
}
920
949
921
950
uid = getuid();
931
960
perror("setgid");
932
961
}
933
962
963
ret = init_gnutls_global(&mc, pubkey, seckey);
964
if (ret == -1){
965
fprintf(stderr, "init_gnutls_global failed\n");
966
exitcode = EXIT_FAILURE;
967
goto end;
968
} else {
969
gnutls_initalized = true;
970
}
971
972
if(mkdtemp(tempdir) == NULL){
973
perror("mkdtemp");
974
tempdir[0] = '\0';
975
goto end;
976
}
977
978
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
979
fprintf(stderr, "gpgme_initalized failed\n");
980
exitcode = EXIT_FAILURE;
981
goto end;
982
} else {
983
gpgme_initalized = true;
984
}
985
934
986
if_index = (AvahiIfIndex) if_nametoindex(interface);
935
987
if(if_index == 0){
936
988
fprintf(stderr, "No such interface: \"%s\"\n", interface);
979
1031
exitcode = EXIT_FAILURE;
980
1032
goto end;
981
1033
}
982
1034
983
1035
{
984
1036
AvahiServerConfig config;
985
1037
/* Do not publish any local Zeroconf records */
988
1040
config.publish_addresses = 0;
989
1041
config.publish_workstation = 0;
990
1042
config.publish_domain = 0;
991
1043
992
1044
/* Allocate a new server */
993
1045
mc.server = avahi_server_new(avahi_simple_poll_get
994
1046
(mc.simple_poll), &config, NULL,
995
1047
NULL, &error);
996
1048
997
1049
/* Free the Avahi configuration data */
998
1050
avahi_server_config_free(&config);
999
1051
}
1019
1071
}
1020
1072
1021
1073
/* Run the main loop */
1022
1074
1023
1075
if (debug){
1024
1076
fprintf(stderr, "Starting Avahi loop search\n");
1025
1077
}
1027
1079
avahi_simple_poll_loop(mc.simple_poll);
1028
1080
1029
1081
end:
1030
1082
1031
1083
if (debug){
1032
1084
fprintf(stderr, "%s exiting\n", argv[0]);
1033
1085
}
1038
1090
1039
1091
if (mc.server != NULL)
1040
1092
avahi_server_free(mc.server);
1041
1093
1042
1094
if (mc.simple_poll != NULL)
1043
1095
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfilename);
1045
free(seckeyfilename);
1046
1096
1047
1097
if (gnutls_initalized){
1048
1098
gnutls_certificate_free_credentials(mc.cred);
1049
1099
gnutls_global_deinit ();
1050
}
1051
1100
gnutls_dh_params_deinit(mc.dh_params);
1101
}
1102
1103
if(gpgme_initalized){
1104
gpgme_release(mc.ctx);
1105
}
1106
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1109
DIR *d;
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1112
if(d == NULL){
1113
perror("opendir");
1114
} else {
1115
while(true){
1116
direntry = readdir(d);
1117
if(direntry == NULL){
1118
break;
1119
}
1120
if (direntry->d_type == DT_REG){
1121
char *fullname = NULL;
1122
ret = asprintf(&fullname, "%s/%s", tempdir,
1123
direntry->d_name);
1124
if(ret < 0){
1125
perror("asprintf");
1126
continue;
1127
}
1128
ret = unlink(fullname);
1129
if(ret == -1){
1130
fprintf(stderr, "unlink(\"%s\"): %s",
1131
fullname, strerror(errno));
1132
}
1133
free(fullname);
1134
}
1135
}
1136
closedir(d);
1137
}
1138
ret = rmdir(tempdir);
1139
if(ret == -1){
1140
perror("rmdir");
1141
}
1142
}
1143
1052
1144
return exitcode;
1053
1145
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0