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- Committer: Teddy Hogeborn
- Date: 2008-10-01 18:41:06 UTC
- Revision ID: teddy@fukt.bsnet.se-20081001184106-r728au6iv0lq8orm
Tags: version-1.0-2
* debian/changelog: Add Debian revision number to old revision too.
- 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:
- Makefile
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 Teddy Hogeborn & Björn Påhlsson
13
13
*
14
14
* This program is free software: you can redistribute it and/or
15
15
* modify it under the terms of the GNU General Public License as
47
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
48
sockaddr_in6, PF_INET6,
49
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
50
uid_t, gid_t, open(), opendir(), DIR */
51
#include <sys/stat.h> /* open() */
52
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
53
struct in6_addr, inet_pton(),
54
54
connect() */
55
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
55
58
#include <assert.h> /* assert() */
56
59
#include <errno.h> /* perror(), errno */
57
60
#include <time.h> /* time() */
58
61
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
62
SIOCSIFFLAGS, if_indextoname(),
60
63
if_nametoindex(), IF_NAMESIZE */
64
#include <netinet/in.h>
61
65
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
66
getuid(), getgid(), setuid(),
63
67
setgid() */
64
#include <netinet/in.h>
65
68
#include <arpa/inet.h> /* inet_pton(), htons */
66
69
#include <iso646.h> /* not, and */
67
70
#include <argp.h> /* struct argp_option, error_t, struct
98
101
99
102
#define BUFFER_SIZE 256
100
103
104
#define PATHDIR "/conf/conf.d/mandos"
105
#define SECKEY "seckey.txt"
106
#define PUBKEY "pubkey.txt"
107
101
108
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
109
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
110
const char *argp_program_version = "mandos-client " VERSION;
105
111
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
106
112
107
113
/* Used for passing in values through the Avahi callback functions */
112
118
unsigned int dh_bits;
113
119
gnutls_dh_params_t dh_params;
114
120
const char *priority;
121
gpgme_ctx_t ctx;
115
122
} mandos_context;
116
123
117
124
/*
132
139
}
133
140
134
141
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
142
* Initialize GPGME.
137
143
*/
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;
144
static bool init_gpgme(mandos_context *mc, const char *seckey,
145
const char *pubkey, const char *tempdir){
146
int ret;
144
147
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
148
gpgme_engine_info_t engine_info;
149
149
150
151
/*
152
* Helper function to insert pub and seckey to the enigne keyring.
153
*/
154
bool import_key(const char *filename){
155
int fd;
156
gpgme_data_t pgp_data;
157
158
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
159
if(fd == -1){
160
perror("open");
161
return false;
162
}
163
164
rc = gpgme_data_new_from_fd(&pgp_data, fd);
165
if (rc != GPG_ERR_NO_ERROR){
166
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
167
gpgme_strsource(rc), gpgme_strerror(rc));
168
return false;
169
}
170
171
rc = gpgme_op_import(mc->ctx, pgp_data);
172
if (rc != GPG_ERR_NO_ERROR){
173
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
174
gpgme_strsource(rc), gpgme_strerror(rc));
175
return false;
176
}
177
178
ret = TEMP_FAILURE_RETRY(close(fd));
179
if(ret == -1){
180
perror("close");
181
}
182
gpgme_data_release(pgp_data);
183
return true;
184
}
185
150
186
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
187
fprintf(stderr, "Initialize gpgme\n");
152
188
}
153
189
154
190
/* Init GPGME */
157
193
if (rc != GPG_ERR_NO_ERROR){
158
194
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
195
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
196
return false;
161
197
}
162
198
163
/* Set GPGME home directory for the OpenPGP engine only */
199
/* Set GPGME home directory for the OpenPGP engine only */
164
200
rc = gpgme_get_engine_info (&engine_info);
165
201
if (rc != GPG_ERR_NO_ERROR){
166
202
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
203
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
204
return false;
169
205
}
170
206
while(engine_info != NULL){
171
207
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
208
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
209
engine_info->file_name, tempdir);
174
210
break;
175
211
}
176
212
engine_info = engine_info->next;
177
213
}
178
214
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
215
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
216
return false;
217
}
218
219
/* Create new GPGME "context" */
220
rc = gpgme_new(&(mc->ctx));
221
if (rc != GPG_ERR_NO_ERROR){
222
fprintf(stderr, "bad gpgme_new: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
224
return false;
225
}
226
227
if (not import_key(pubkey) or not import_key(seckey)){
228
return false;
229
}
230
231
return true;
232
}
233
234
/*
235
* Decrypt OpenPGP data.
236
* Returns -1 on error
237
*/
238
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
239
const char *cryptotext,
240
size_t crypto_size,
241
char **plaintext){
242
gpgme_data_t dh_crypto, dh_plain;
243
gpgme_error_t rc;
244
ssize_t ret;
245
size_t plaintext_capacity = 0;
246
ssize_t plaintext_length = 0;
247
248
if (debug){
249
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
181
250
}
182
251
183
252
/* Create new GPGME data buffer from memory cryptotext */
198
267
return -1;
199
268
}
200
269
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
270
/* Decrypt data from the cryptotext data buffer to the plaintext
211
271
data buffer */
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
272
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
213
273
if (rc != GPG_ERR_NO_ERROR){
214
274
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
275
gpgme_strsource(rc), gpgme_strerror(rc));
216
276
plaintext_length = -1;
217
277
if (debug){
218
278
gpgme_decrypt_result_t result;
219
result = gpgme_op_decrypt_result(ctx);
279
result = gpgme_op_decrypt_result(mc->ctx);
220
280
if (result == NULL){
221
281
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
222
282
} else {
251
311
252
312
/* Seek back to the beginning of the GPGME plaintext data buffer */
253
313
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
314
perror("gpgme_data_seek");
255
315
plaintext_length = -1;
256
316
goto decrypt_end;
257
317
}
281
341
}
282
342
plaintext_length += ret;
283
343
}
284
344
285
345
if(debug){
286
346
fprintf(stderr, "Decrypted password is: ");
287
347
for(ssize_t i = 0; i < plaintext_length; i++){
348
408
}
349
409
350
410
if(debug){
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
411
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
412
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
353
413
seckeyfilename);
354
414
}
355
415
360
420
fprintf(stderr,
361
421
"Error[%d] while reading the OpenPGP key pair ('%s',"
362
422
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
363
fprintf(stdout, "The GnuTLS error is: %s\n",
423
fprintf(stderr, "The GnuTLS error is: %s\n",
364
424
safer_gnutls_strerror(ret));
365
425
goto globalfail;
366
426
}
380
440
}
381
441
382
442
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
383
443
384
444
return 0;
385
445
386
446
globalfail:
387
447
388
448
gnutls_certificate_free_credentials(mc->cred);
389
449
gnutls_global_deinit();
450
gnutls_dh_params_deinit(mc->dh_params);
390
451
return -1;
391
392
452
}
393
453
394
454
static int init_gnutls_session(mandos_context *mc,
466
526
perror("socket");
467
527
return -1;
468
528
}
469
529
470
530
if(debug){
471
531
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
532
perror("if_indextoname");
511
571
perror("connect");
512
572
return -1;
513
573
}
514
574
515
575
const char *out = mandos_protocol_version;
516
576
written = 0;
517
577
while (true){
535
595
}
536
596
}
537
597
}
538
598
539
599
if(debug){
540
600
fprintf(stderr, "Establishing TLS session with %s\n", ip);
541
601
}
542
602
543
603
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
604
545
605
do{
546
606
ret = gnutls_handshake (session);
547
607
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
561
621
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
562
622
ip);
563
623
}
564
624
565
625
while(true){
566
626
buffer_capacity = adjustbuffer(&buffer, buffer_length,
567
627
buffer_capacity);
611
671
gnutls_bye (session, GNUTLS_SHUT_RDWR);
612
672
613
673
if (buffer_length > 0){
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
674
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
615
675
buffer_length,
616
&decrypted_buffer,
617
keydir);
676
&decrypted_buffer);
618
677
if (decrypted_buffer_size >= 0){
619
678
written = 0;
620
679
while(written < (size_t) decrypted_buffer_size){
643
702
644
703
mandos_end:
645
704
free(buffer);
646
close(tcp_sd);
705
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
706
if(ret == -1){
707
perror("close");
708
}
647
709
gnutls_deinit (session);
648
710
return retval;
649
711
}
745
807
}
746
808
}
747
809
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
810
int main(int argc, char *argv[]){
761
811
AvahiSServiceBrowser *sb = NULL;
762
812
int error;
768
818
uid_t uid;
769
819
gid_t gid;
770
820
char *connect_to = NULL;
821
char tempdir[] = "/tmp/mandosXXXXXX";
771
822
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";
823
const char *seckey = PATHDIR "/" SECKEY;
824
const char *pubkey = PATHDIR "/" PUBKEY;
825
776
826
mandos_context mc = { .simple_poll = NULL, .server = NULL,
777
.dh_bits = 1024, .priority = "SECURE256"};
827
.dh_bits = 1024, .priority = "SECURE256"
828
":!CTYPE-X.509:+CTYPE-OPENPGP" };
778
829
bool gnutls_initalized = false;
830
bool gpgme_initalized = false;
779
831
780
832
{
781
833
struct argp_option options[] = {
782
834
{ .name = "debug", .key = 128,
783
835
.doc = "Debug mode", .group = 3 },
784
836
{ .name = "connect", .key = 'c',
785
.arg = "IP",
786
.doc = "Connect directly to a sepcified mandos server",
837
.arg = "ADDRESS:PORT",
838
.doc = "Connect directly to a specific Mandos server",
787
839
.group = 1 },
788
840
{ .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",
841
.arg = "NAME",
842
.doc = "Interface that will be used to search for Mandos"
843
" servers",
795
844
.group = 1 },
796
845
{ .name = "seckey", .key = 's',
797
.arg = "SECKEY",
798
.doc = "Secret openpgp key for gnutls authentication",
846
.arg = "FILE",
847
.doc = "OpenPGP secret key file base name",
799
848
.group = 1 },
800
849
{ .name = "pubkey", .key = 'p',
801
.arg = "PUBKEY",
802
.doc = "Public openpgp key for gnutls authentication",
850
.arg = "FILE",
851
.doc = "OpenPGP public key file base name",
803
852
.group = 2 },
804
853
{ .name = "dh-bits", .key = 129,
805
854
.arg = "BITS",
806
.doc = "dh-bits to use in gnutls communication",
855
.doc = "Bit length of the prime number used in the"
856
" Diffie-Hellman key exchange",
807
857
.group = 2 },
808
858
{ .name = "priority", .key = 130,
809
.arg = "PRIORITY",
810
.doc = "GNUTLS priority", .group = 1 },
859
.arg = "STRING",
860
.doc = "GnuTLS priority string for the TLS handshake",
861
.group = 1 },
811
862
{ .name = NULL }
812
863
};
813
814
864
815
865
error_t parse_opt (int key, char *arg,
816
866
struct argp_state *state) {
817
867
/* Get the INPUT argument from `argp_parse', which we know is
818
868
a pointer to our plugin list pointer. */
819
869
switch (key) {
820
case 128:
870
case 128: /* --debug */
821
871
debug = true;
822
872
break;
823
case 'c':
873
case 'c': /* --connect */
824
874
connect_to = arg;
825
875
break;
826
case 'i':
876
case 'i': /* --interface */
827
877
interface = arg;
828
878
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:
879
case 's': /* --seckey */
880
seckey = arg;
881
break;
882
case 'p': /* --pubkey */
883
pubkey = arg;
884
break;
885
case 129: /* --dh-bits */
839
886
errno = 0;
840
887
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
841
888
if (errno){
843
890
exit(EXIT_FAILURE);
844
891
}
845
892
break;
846
case 130:
893
case 130: /* --priority */
847
894
mc.priority = arg;
848
895
break;
849
896
case ARGP_KEY_ARG:
855
902
}
856
903
return 0;
857
904
}
858
905
859
906
struct argp argp = { .options = options, .parser = parse_opt,
860
907
.args_doc = "",
861
908
.doc = "Mandos client -- Get and decrypt"
862
" passwords from mandos server" };
909
" passwords from a Mandos server" };
863
910
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
864
911
if (ret == ARGP_ERR_UNKNOWN){
865
912
fprintf(stderr, "Unknown error while parsing arguments\n");
867
914
goto end;
868
915
}
869
916
}
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
917
894
918
/* If the interface is down, bring it up */
895
919
{
915
939
goto end;
916
940
}
917
941
}
918
close(sd);
942
ret = TEMP_FAILURE_RETRY(close(sd));
943
if(ret == -1){
944
perror("close");
945
}
919
946
}
920
947
921
948
uid = getuid();
931
958
perror("setgid");
932
959
}
933
960
961
ret = init_gnutls_global(&mc, pubkey, seckey);
962
if (ret == -1){
963
fprintf(stderr, "init_gnutls_global failed\n");
964
exitcode = EXIT_FAILURE;
965
goto end;
966
} else {
967
gnutls_initalized = true;
968
}
969
970
if(mkdtemp(tempdir) == NULL){
971
perror("mkdtemp");
972
tempdir[0] = '\0';
973
goto end;
974
}
975
976
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
977
fprintf(stderr, "gpgme_initalized failed\n");
978
exitcode = EXIT_FAILURE;
979
goto end;
980
} else {
981
gpgme_initalized = true;
982
}
983
934
984
if_index = (AvahiIfIndex) if_nametoindex(interface);
935
985
if(if_index == 0){
936
986
fprintf(stderr, "No such interface: \"%s\"\n", interface);
979
1029
exitcode = EXIT_FAILURE;
980
1030
goto end;
981
1031
}
982
1032
983
1033
{
984
1034
AvahiServerConfig config;
985
1035
/* Do not publish any local Zeroconf records */
988
1038
config.publish_addresses = 0;
989
1039
config.publish_workstation = 0;
990
1040
config.publish_domain = 0;
991
1041
992
1042
/* Allocate a new server */
993
1043
mc.server = avahi_server_new(avahi_simple_poll_get
994
1044
(mc.simple_poll), &config, NULL,
995
1045
NULL, &error);
996
1046
997
1047
/* Free the Avahi configuration data */
998
1048
avahi_server_config_free(&config);
999
1049
}
1019
1069
}
1020
1070
1021
1071
/* Run the main loop */
1022
1072
1023
1073
if (debug){
1024
1074
fprintf(stderr, "Starting Avahi loop search\n");
1025
1075
}
1027
1077
avahi_simple_poll_loop(mc.simple_poll);
1028
1078
1029
1079
end:
1030
1080
1031
1081
if (debug){
1032
1082
fprintf(stderr, "%s exiting\n", argv[0]);
1033
1083
}
1038
1088
1039
1089
if (mc.server != NULL)
1040
1090
avahi_server_free(mc.server);
1041
1091
1042
1092
if (mc.simple_poll != NULL)
1043
1093
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfilename);
1045
free(seckeyfilename);
1046
1094
1047
1095
if (gnutls_initalized){
1048
1096
gnutls_certificate_free_credentials(mc.cred);
1049
1097
gnutls_global_deinit ();
1050
}
1051
1098
gnutls_dh_params_deinit(mc.dh_params);
1099
}
1100
1101
if(gpgme_initalized){
1102
gpgme_release(mc.ctx);
1103
}
1104
1105
/* Removes the temp directory used by GPGME */
1106
if(tempdir[0] != '\0'){
1107
DIR *d;
1108
struct dirent *direntry;
1109
d = opendir(tempdir);
1110
if(d == NULL){
1111
perror("opendir");
1112
} else {
1113
while(true){
1114
direntry = readdir(d);
1115
if(direntry == NULL){
1116
break;
1117
}
1118
if (direntry->d_type == DT_REG){
1119
char *fullname = NULL;
1120
ret = asprintf(&fullname, "%s/%s", tempdir,
1121
direntry->d_name);
1122
if(ret < 0){
1123
perror("asprintf");
1124
continue;
1125
}
1126
ret = unlink(fullname);
1127
if(ret == -1){
1128
fprintf(stderr, "unlink(\"%s\"): %s",
1129
fullname, strerror(errno));
1130
}
1131
free(fullname);
1132
}
1133
}
1134
closedir(d);
1135
}
1136
ret = rmdir(tempdir);
1137
if(ret == -1){
1138
perror("rmdir");
1139
}
1140
}
1141
1052
1142
return exitcode;
1053
1143
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0