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- Committer: Teddy Hogeborn
- Date: 2009-01-06 22:51:38 UTC
- Revision ID: teddy@fukt.bsnet.se-20090106225138-0tomnv9w18qlmvnz
* Makefile (mandos.lsm): Also update file name using version number.
- 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 = 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 = 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,
466
527
perror("socket");
467
528
return -1;
468
529
}
469
530
470
531
if(debug){
471
532
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
533
perror("if_indextoname");
511
572
perror("connect");
512
573
return -1;
513
574
}
514
575
515
576
const char *out = mandos_protocol_version;
516
577
written = 0;
517
578
while (true){
535
596
}
536
597
}
537
598
}
538
599
539
600
if(debug){
540
601
fprintf(stderr, "Establishing TLS session with %s\n", ip);
541
602
}
542
603
543
604
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
605
545
606
do{
546
607
ret = gnutls_handshake (session);
547
608
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
561
622
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
562
623
ip);
563
624
}
564
625
565
626
while(true){
566
627
buffer_capacity = adjustbuffer(&buffer, buffer_length,
567
628
buffer_capacity);
611
672
gnutls_bye (session, GNUTLS_SHUT_RDWR);
612
673
613
674
if (buffer_length > 0){
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
675
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
615
676
buffer_length,
616
&decrypted_buffer,
617
keydir);
677
&decrypted_buffer);
618
678
if (decrypted_buffer_size >= 0){
619
679
written = 0;
620
680
while(written < (size_t) decrypted_buffer_size){
643
703
644
704
mandos_end:
645
705
free(buffer);
646
close(tcp_sd);
706
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
707
if(ret == -1){
708
perror("close");
709
}
647
710
gnutls_deinit (session);
648
711
return retval;
649
712
}
745
808
}
746
809
}
747
810
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
811
int main(int argc, char *argv[]){
761
812
AvahiSServiceBrowser *sb = NULL;
762
813
int error;
768
819
uid_t uid;
769
820
gid_t gid;
770
821
char *connect_to = NULL;
822
char tempdir[] = "/tmp/mandosXXXXXX";
771
823
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";
824
const char *seckey = PATHDIR "/" SECKEY;
825
const char *pubkey = PATHDIR "/" PUBKEY;
826
776
827
mandos_context mc = { .simple_poll = NULL, .server = NULL,
777
.dh_bits = 1024, .priority = "SECURE256"};
828
.dh_bits = 1024, .priority = "SECURE256"
829
":!CTYPE-X.509:+CTYPE-OPENPGP" };
778
830
bool gnutls_initalized = false;
831
bool gpgme_initalized = false;
779
832
780
833
{
781
834
struct argp_option options[] = {
782
835
{ .name = "debug", .key = 128,
783
836
.doc = "Debug mode", .group = 3 },
784
837
{ .name = "connect", .key = 'c',
785
.arg = "IP",
786
.doc = "Connect directly to a sepcified mandos server",
838
.arg = "ADDRESS:PORT",
839
.doc = "Connect directly to a specific Mandos server",
787
840
.group = 1 },
788
841
{ .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",
842
.arg = "NAME",
843
.doc = "Interface that will be used to search for Mandos"
844
" servers",
795
845
.group = 1 },
796
846
{ .name = "seckey", .key = 's',
797
.arg = "SECKEY",
798
.doc = "Secret openpgp key for gnutls authentication",
847
.arg = "FILE",
848
.doc = "OpenPGP secret key file base name",
799
849
.group = 1 },
800
850
{ .name = "pubkey", .key = 'p',
801
.arg = "PUBKEY",
802
.doc = "Public openpgp key for gnutls authentication",
851
.arg = "FILE",
852
.doc = "OpenPGP public key file base name",
803
853
.group = 2 },
804
854
{ .name = "dh-bits", .key = 129,
805
855
.arg = "BITS",
806
.doc = "dh-bits to use in gnutls communication",
856
.doc = "Bit length of the prime number used in the"
857
" Diffie-Hellman key exchange",
807
858
.group = 2 },
808
859
{ .name = "priority", .key = 130,
809
.arg = "PRIORITY",
810
.doc = "GNUTLS priority", .group = 1 },
860
.arg = "STRING",
861
.doc = "GnuTLS priority string for the TLS handshake",
862
.group = 1 },
811
863
{ .name = NULL }
812
864
};
813
814
865
815
866
error_t parse_opt (int key, char *arg,
816
867
struct argp_state *state) {
817
868
/* Get the INPUT argument from `argp_parse', which we know is
818
869
a pointer to our plugin list pointer. */
819
870
switch (key) {
820
case 128:
871
case 128: /* --debug */
821
872
debug = true;
822
873
break;
823
case 'c':
874
case 'c': /* --connect */
824
875
connect_to = arg;
825
876
break;
826
case 'i':
877
case 'i': /* --interface */
827
878
interface = arg;
828
879
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:
880
case 's': /* --seckey */
881
seckey = arg;
882
break;
883
case 'p': /* --pubkey */
884
pubkey = arg;
885
break;
886
case 129: /* --dh-bits */
839
887
errno = 0;
840
888
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
841
889
if (errno){
843
891
exit(EXIT_FAILURE);
844
892
}
845
893
break;
846
case 130:
894
case 130: /* --priority */
847
895
mc.priority = arg;
848
896
break;
849
897
case ARGP_KEY_ARG:
855
903
}
856
904
return 0;
857
905
}
858
906
859
907
struct argp argp = { .options = options, .parser = parse_opt,
860
908
.args_doc = "",
861
909
.doc = "Mandos client -- Get and decrypt"
862
" passwords from mandos server" };
910
" passwords from a Mandos server" };
863
911
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
864
912
if (ret == ARGP_ERR_UNKNOWN){
865
913
fprintf(stderr, "Unknown error while parsing arguments\n");
867
915
goto end;
868
916
}
869
917
}
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
918
894
919
/* If the interface is down, bring it up */
895
920
{
915
940
goto end;
916
941
}
917
942
}
918
close(sd);
943
ret = TEMP_FAILURE_RETRY(close(sd));
944
if(ret == -1){
945
perror("close");
946
}
919
947
}
920
948
921
949
uid = getuid();
931
959
perror("setgid");
932
960
}
933
961
962
ret = init_gnutls_global(&mc, pubkey, seckey);
963
if (ret == -1){
964
fprintf(stderr, "init_gnutls_global failed\n");
965
exitcode = EXIT_FAILURE;
966
goto end;
967
} else {
968
gnutls_initalized = true;
969
}
970
971
if(mkdtemp(tempdir) == NULL){
972
perror("mkdtemp");
973
tempdir[0] = '\0';
974
goto end;
975
}
976
977
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
978
fprintf(stderr, "gpgme_initalized failed\n");
979
exitcode = EXIT_FAILURE;
980
goto end;
981
} else {
982
gpgme_initalized = true;
983
}
984
934
985
if_index = (AvahiIfIndex) if_nametoindex(interface);
935
986
if(if_index == 0){
936
987
fprintf(stderr, "No such interface: \"%s\"\n", interface);
979
1030
exitcode = EXIT_FAILURE;
980
1031
goto end;
981
1032
}
982
1033
983
1034
{
984
1035
AvahiServerConfig config;
985
1036
/* Do not publish any local Zeroconf records */
988
1039
config.publish_addresses = 0;
989
1040
config.publish_workstation = 0;
990
1041
config.publish_domain = 0;
991
1042
992
1043
/* Allocate a new server */
993
1044
mc.server = avahi_server_new(avahi_simple_poll_get
994
1045
(mc.simple_poll), &config, NULL,
995
1046
NULL, &error);
996
1047
997
1048
/* Free the Avahi configuration data */
998
1049
avahi_server_config_free(&config);
999
1050
}
1019
1070
}
1020
1071
1021
1072
/* Run the main loop */
1022
1073
1023
1074
if (debug){
1024
1075
fprintf(stderr, "Starting Avahi loop search\n");
1025
1076
}
1027
1078
avahi_simple_poll_loop(mc.simple_poll);
1028
1079
1029
1080
end:
1030
1081
1031
1082
if (debug){
1032
1083
fprintf(stderr, "%s exiting\n", argv[0]);
1033
1084
}
1038
1089
1039
1090
if (mc.server != NULL)
1040
1091
avahi_server_free(mc.server);
1041
1092
1042
1093
if (mc.simple_poll != NULL)
1043
1094
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfilename);
1045
free(seckeyfilename);
1046
1095
1047
1096
if (gnutls_initalized){
1048
1097
gnutls_certificate_free_credentials(mc.cred);
1049
1098
gnutls_global_deinit ();
1050
}
1051
1099
gnutls_dh_params_deinit(mc.dh_params);
1100
}
1101
1102
if(gpgme_initalized){
1103
gpgme_release(mc.ctx);
1104
}
1105
1106
/* Removes the temp directory used by GPGME */
1107
if(tempdir[0] != '\0'){
1108
DIR *d;
1109
struct dirent *direntry;
1110
d = opendir(tempdir);
1111
if(d == NULL){
1112
perror("opendir");
1113
} else {
1114
while(true){
1115
direntry = readdir(d);
1116
if(direntry == NULL){
1117
break;
1118
}
1119
if (direntry->d_type == DT_REG){
1120
char *fullname = NULL;
1121
ret = asprintf(&fullname, "%s/%s", tempdir,
1122
direntry->d_name);
1123
if(ret < 0){
1124
perror("asprintf");
1125
continue;
1126
}
1127
ret = unlink(fullname);
1128
if(ret == -1){
1129
fprintf(stderr, "unlink(\"%s\"): %s",
1130
fullname, strerror(errno));
1131
}
1132
free(fullname);
1133
}
1134
}
1135
closedir(d);
1136
}
1137
ret = rmdir(tempdir);
1138
if(ret == -1){
1139
perror("rmdir");
1140
}
1141
}
1142
1052
1143
return exitcode;
1053
1144
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0