To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 196.1.1
- compare with another revision
- download diff
- download tarball
- view history from revision 196.1.1
- Committer: Björn Påhlsson
- Date: 2008-09-26 20:31:09 UTC
- mfrom: (214 mandos)
- mto: This revision was merged to the branch mainline in revision 400.
- Revision ID: belorn@angua-20080926203109-rsjtuxgnkyot5kpl
merge
- 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
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
108
#define PATHDIR "/conf/conf.d/mandos"
109
#define SECKEY "seckey.txt"
110
#define PUBKEY "pubkey.txt"
111
101
112
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
113
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
114
const char *argp_program_version = "mandos-client 1.0";
105
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
106
116
107
117
/* Used for passing in values through the Avahi callback functions */
112
122
unsigned int dh_bits;
113
123
gnutls_dh_params_t dh_params;
114
124
const char *priority;
125
gpgme_ctx_t ctx;
115
126
} mandos_context;
116
127
117
128
/*
132
143
}
133
144
134
145
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
146
* Initialize GPGME.
137
147
*/
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;
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
144
151
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
152
gpgme_engine_info_t engine_info;
149
153
154
155
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
157
*/
158
bool import_key(const char *filename){
159
int fd;
160
gpgme_data_t pgp_data;
161
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
if(fd == -1){
164
perror("open");
165
return false;
166
}
167
168
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
if (rc != GPG_ERR_NO_ERROR){
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
gpgme_strsource(rc), gpgme_strerror(rc));
172
return false;
173
}
174
175
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if (rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
179
return false;
180
}
181
182
ret = TEMP_FAILURE_RETRY(close(fd));
183
if(ret == -1){
184
perror("close");
185
}
186
gpgme_data_release(pgp_data);
187
return true;
188
}
189
150
190
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
191
fprintf(stderr, "Initialize gpgme\n");
152
192
}
153
193
154
194
/* Init GPGME */
157
197
if (rc != GPG_ERR_NO_ERROR){
158
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
199
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
200
return false;
161
201
}
162
202
163
/* Set GPGME home directory for the OpenPGP engine only */
203
/* Set GPGME home directory for the OpenPGP engine only */
164
204
rc = gpgme_get_engine_info (&engine_info);
165
205
if (rc != GPG_ERR_NO_ERROR){
166
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
207
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
208
return false;
169
209
}
170
210
while(engine_info != NULL){
171
211
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
212
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
213
engine_info->file_name, tempdir);
174
214
break;
175
215
}
176
216
engine_info = engine_info->next;
177
217
}
178
218
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
220
return false;
221
}
222
223
/* Create new GPGME "context" */
224
rc = gpgme_new(&(mc->ctx));
225
if (rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
228
return false;
229
}
230
231
if (not import_key(pubkey) or not import_key(seckey)){
232
return false;
233
}
234
235
return true;
236
}
237
238
/*
239
* Decrypt OpenPGP data.
240
* Returns -1 on error
241
*/
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
246
gpgme_data_t dh_crypto, dh_plain;
247
gpgme_error_t rc;
248
ssize_t ret;
249
size_t plaintext_capacity = 0;
250
ssize_t plaintext_length = 0;
251
252
if (debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
181
254
}
182
255
183
256
/* Create new GPGME data buffer from memory cryptotext */
198
271
return -1;
199
272
}
200
273
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
274
/* Decrypt data from the cryptotext data buffer to the plaintext
211
275
data buffer */
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
213
277
if (rc != GPG_ERR_NO_ERROR){
214
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
279
gpgme_strsource(rc), gpgme_strerror(rc));
216
280
plaintext_length = -1;
217
281
if (debug){
218
282
gpgme_decrypt_result_t result;
219
result = gpgme_op_decrypt_result(ctx);
283
result = gpgme_op_decrypt_result(mc->ctx);
220
284
if (result == NULL){
221
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
222
286
} else {
251
315
252
316
/* Seek back to the beginning of the GPGME plaintext data buffer */
253
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
318
perror("gpgme_data_seek");
255
319
plaintext_length = -1;
256
320
goto decrypt_end;
257
321
}
281
345
}
282
346
plaintext_length += ret;
283
347
}
284
348
285
349
if(debug){
286
350
fprintf(stderr, "Decrypted password is: ");
287
351
for(ssize_t i = 0; i < plaintext_length; i++){
348
412
}
349
413
350
414
if(debug){
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
353
417
seckeyfilename);
354
418
}
355
419
360
424
fprintf(stderr,
361
425
"Error[%d] while reading the OpenPGP key pair ('%s',"
362
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
363
fprintf(stdout, "The GnuTLS error is: %s\n",
427
fprintf(stderr, "The GnuTLS error is: %s\n",
364
428
safer_gnutls_strerror(ret));
365
429
goto globalfail;
366
430
}
380
444
}
381
445
382
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
383
447
384
448
return 0;
385
449
386
450
globalfail:
387
451
388
452
gnutls_certificate_free_credentials(mc->cred);
389
453
gnutls_global_deinit();
454
gnutls_dh_params_deinit(mc->dh_params);
390
455
return -1;
391
392
456
}
393
457
394
458
static int init_gnutls_session(mandos_context *mc,
466
530
perror("socket");
467
531
return -1;
468
532
}
469
533
470
534
if(debug){
471
535
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
536
perror("if_indextoname");
511
575
perror("connect");
512
576
return -1;
513
577
}
514
578
515
579
const char *out = mandos_protocol_version;
516
580
written = 0;
517
581
while (true){
535
599
}
536
600
}
537
601
}
538
602
539
603
if(debug){
540
604
fprintf(stderr, "Establishing TLS session with %s\n", ip);
541
605
}
542
606
543
607
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
608
545
609
do{
546
610
ret = gnutls_handshake (session);
547
611
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
561
625
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
562
626
ip);
563
627
}
564
628
565
629
while(true){
566
630
buffer_capacity = adjustbuffer(&buffer, buffer_length,
567
631
buffer_capacity);
611
675
gnutls_bye (session, GNUTLS_SHUT_RDWR);
612
676
613
677
if (buffer_length > 0){
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
678
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
615
679
buffer_length,
616
&decrypted_buffer,
617
keydir);
680
&decrypted_buffer);
618
681
if (decrypted_buffer_size >= 0){
619
682
written = 0;
620
683
while(written < (size_t) decrypted_buffer_size){
643
706
644
707
mandos_end:
645
708
free(buffer);
646
close(tcp_sd);
709
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
710
if(ret == -1){
711
perror("close");
712
}
647
713
gnutls_deinit (session);
648
714
return retval;
649
715
}
745
811
}
746
812
}
747
813
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
814
int main(int argc, char *argv[]){
761
815
AvahiSServiceBrowser *sb = NULL;
762
816
int error;
768
822
uid_t uid;
769
823
gid_t gid;
770
824
char *connect_to = NULL;
825
char tempdir[] = "/tmp/mandosXXXXXX";
771
826
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";
827
const char *seckey = PATHDIR "/" SECKEY;
828
const char *pubkey = PATHDIR "/" PUBKEY;
829
776
830
mandos_context mc = { .simple_poll = NULL, .server = NULL,
777
.dh_bits = 1024, .priority = "SECURE256"};
831
.dh_bits = 1024, .priority = "SECURE256"
832
":!CTYPE-X.509:+CTYPE-OPENPGP" };
778
833
bool gnutls_initalized = false;
834
bool gpgme_initalized = false;
779
835
780
836
{
781
837
struct argp_option options[] = {
782
838
{ .name = "debug", .key = 128,
783
839
.doc = "Debug mode", .group = 3 },
784
840
{ .name = "connect", .key = 'c',
785
.arg = "IP",
786
.doc = "Connect directly to a sepcified mandos server",
841
.arg = "ADDRESS:PORT",
842
.doc = "Connect directly to a specific Mandos server",
787
843
.group = 1 },
788
844
{ .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",
845
.arg = "NAME",
846
.doc = "Interface that will be used to search for Mandos"
847
" servers",
795
848
.group = 1 },
796
849
{ .name = "seckey", .key = 's',
797
.arg = "SECKEY",
798
.doc = "Secret openpgp key for gnutls authentication",
850
.arg = "FILE",
851
.doc = "OpenPGP secret key file base name",
799
852
.group = 1 },
800
853
{ .name = "pubkey", .key = 'p',
801
.arg = "PUBKEY",
802
.doc = "Public openpgp key for gnutls authentication",
854
.arg = "FILE",
855
.doc = "OpenPGP public key file base name",
803
856
.group = 2 },
804
857
{ .name = "dh-bits", .key = 129,
805
858
.arg = "BITS",
806
.doc = "dh-bits to use in gnutls communication",
859
.doc = "Bit length of the prime number used in the"
860
" Diffie-Hellman key exchange",
807
861
.group = 2 },
808
862
{ .name = "priority", .key = 130,
809
.arg = "PRIORITY",
810
.doc = "GNUTLS priority", .group = 1 },
863
.arg = "STRING",
864
.doc = "GnuTLS priority string for the TLS handshake",
865
.group = 1 },
811
866
{ .name = NULL }
812
867
};
813
814
868
815
869
error_t parse_opt (int key, char *arg,
816
870
struct argp_state *state) {
817
871
/* Get the INPUT argument from `argp_parse', which we know is
818
872
a pointer to our plugin list pointer. */
819
873
switch (key) {
820
case 128:
874
case 128: /* --debug */
821
875
debug = true;
822
876
break;
823
case 'c':
877
case 'c': /* --connect */
824
878
connect_to = arg;
825
879
break;
826
case 'i':
880
case 'i': /* --interface */
827
881
interface = arg;
828
882
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:
883
case 's': /* --seckey */
884
seckey = arg;
885
break;
886
case 'p': /* --pubkey */
887
pubkey = arg;
888
break;
889
case 129: /* --dh-bits */
839
890
errno = 0;
840
891
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
841
892
if (errno){
843
894
exit(EXIT_FAILURE);
844
895
}
845
896
break;
846
case 130:
897
case 130: /* --priority */
847
898
mc.priority = arg;
848
899
break;
849
900
case ARGP_KEY_ARG:
855
906
}
856
907
return 0;
857
908
}
858
909
859
910
struct argp argp = { .options = options, .parser = parse_opt,
860
911
.args_doc = "",
861
912
.doc = "Mandos client -- Get and decrypt"
862
" passwords from mandos server" };
913
" passwords from a Mandos server" };
863
914
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
864
915
if (ret == ARGP_ERR_UNKNOWN){
865
916
fprintf(stderr, "Unknown error while parsing arguments\n");
867
918
goto end;
868
919
}
869
920
}
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
921
894
922
/* If the interface is down, bring it up */
895
923
{
915
943
goto end;
916
944
}
917
945
}
918
close(sd);
946
ret = TEMP_FAILURE_RETRY(close(sd));
947
if(ret == -1){
948
perror("close");
949
}
919
950
}
920
951
921
952
uid = getuid();
931
962
perror("setgid");
932
963
}
933
964
965
ret = init_gnutls_global(&mc, pubkey, seckey);
966
if (ret == -1){
967
fprintf(stderr, "init_gnutls_global failed\n");
968
exitcode = EXIT_FAILURE;
969
goto end;
970
} else {
971
gnutls_initalized = true;
972
}
973
974
if(mkdtemp(tempdir) == NULL){
975
perror("mkdtemp");
976
tempdir[0] = '\0';
977
goto end;
978
}
979
980
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
981
fprintf(stderr, "gpgme_initalized failed\n");
982
exitcode = EXIT_FAILURE;
983
goto end;
984
} else {
985
gpgme_initalized = true;
986
}
987
934
988
if_index = (AvahiIfIndex) if_nametoindex(interface);
935
989
if(if_index == 0){
936
990
fprintf(stderr, "No such interface: \"%s\"\n", interface);
979
1033
exitcode = EXIT_FAILURE;
980
1034
goto end;
981
1035
}
982
1036
983
1037
{
984
1038
AvahiServerConfig config;
985
1039
/* Do not publish any local Zeroconf records */
988
1042
config.publish_addresses = 0;
989
1043
config.publish_workstation = 0;
990
1044
config.publish_domain = 0;
991
1045
992
1046
/* Allocate a new server */
993
1047
mc.server = avahi_server_new(avahi_simple_poll_get
994
1048
(mc.simple_poll), &config, NULL,
995
1049
NULL, &error);
996
1050
997
1051
/* Free the Avahi configuration data */
998
1052
avahi_server_config_free(&config);
999
1053
}
1019
1073
}
1020
1074
1021
1075
/* Run the main loop */
1022
1076
1023
1077
if (debug){
1024
1078
fprintf(stderr, "Starting Avahi loop search\n");
1025
1079
}
1027
1081
avahi_simple_poll_loop(mc.simple_poll);
1028
1082
1029
1083
end:
1030
1084
1031
1085
if (debug){
1032
1086
fprintf(stderr, "%s exiting\n", argv[0]);
1033
1087
}
1038
1092
1039
1093
if (mc.server != NULL)
1040
1094
avahi_server_free(mc.server);
1041
1095
1042
1096
if (mc.simple_poll != NULL)
1043
1097
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfilename);
1045
free(seckeyfilename);
1046
1098
1047
1099
if (gnutls_initalized){
1048
1100
gnutls_certificate_free_credentials(mc.cred);
1049
1101
gnutls_global_deinit ();
1050
}
1051
1102
gnutls_dh_params_deinit(mc.dh_params);
1103
}
1104
1105
if(gpgme_initalized){
1106
gpgme_release(mc.ctx);
1107
}
1108
1109
/* Removes the temp directory used by GPGME */
1110
if(tempdir[0] != '\0'){
1111
DIR *d;
1112
struct dirent *direntry;
1113
d = opendir(tempdir);
1114
if(d == NULL){
1115
perror("opendir");
1116
} else {
1117
while(true){
1118
direntry = readdir(d);
1119
if(direntry == NULL){
1120
break;
1121
}
1122
if (direntry->d_type == DT_REG){
1123
char *fullname = NULL;
1124
ret = asprintf(&fullname, "%s/%s", tempdir,
1125
direntry->d_name);
1126
if(ret < 0){
1127
perror("asprintf");
1128
continue;
1129
}
1130
ret = unlink(fullname);
1131
if(ret == -1){
1132
fprintf(stderr, "unlink(\"%s\"): %s",
1133
fullname, strerror(errno));
1134
}
1135
free(fullname);
1136
}
1137
}
1138
closedir(d);
1139
}
1140
ret = rmdir(tempdir);
1141
if(ret == -1){
1142
perror("rmdir");
1143
}
1144
}
1145
1052
1146
return exitcode;
1053
1147
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0