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- Committer: Björn Påhlsson
- Date: 2008-08-24 10:19:59 UTC
- mfrom: (98 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 99.
- Revision ID: belorn@braxen-20080824101959-cbs6x05jwgqrlp2s
merge + fallback bugg
- files removed:
- .bzrignore
- files modified:
- Makefile
added
removed
plugins.d/password-request.c
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, open(), opendir(), DIR */
51
#include <sys/stat.h> /* open() */
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
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 */
58
55
#include <assert.h> /* assert() */
59
56
#include <errno.h> /* perror(), errno */
60
57
#include <time.h> /* time() */
61
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
62
59
SIOCSIFFLAGS, if_indextoname(),
63
60
if_nametoindex(), IF_NAMESIZE */
64
#include <netinet/in.h>
65
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
66
62
getuid(), getgid(), setuid(),
67
63
setgid() */
64
#include <netinet/in.h>
68
65
#include <arpa/inet.h> /* inet_pton(), htons */
69
66
#include <iso646.h> /* not, and */
70
67
#include <argp.h> /* struct argp_option, error_t, struct
101
98
102
99
#define BUFFER_SIZE 256
103
100
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 "pupkey.txt"
111
112
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
113
103
static const char mandos_protocol_version[] = "1";
114
104
const char *argp_program_version = "password-request 1.0";
115
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
122
112
unsigned int dh_bits;
123
113
gnutls_dh_params_t dh_params;
124
114
const char *priority;
125
gpgme_ctx_t ctx;
126
115
} mandos_context;
127
116
128
117
/*
143
132
}
144
133
145
134
/*
146
* Initialize GPGME.
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
147
137
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
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;
151
144
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
152
148
gpgme_engine_info_t engine_info;
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
149
190
150
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
192
152
}
193
153
194
154
/* Init GPGME */
195
155
gpgme_check_version(NULL);
196
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
157
if (rc != GPG_ERR_NO_ERROR){
198
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
159
gpgme_strsource(rc), gpgme_strerror(rc));
200
return false;
160
return -1;
201
161
}
202
203
/* Set GPGME home directory for the OpenPGP engine only */
162
163
/* Set GPGME home directory for the OpenPGP engine only */
204
164
rc = gpgme_get_engine_info (&engine_info);
205
165
if (rc != GPG_ERR_NO_ERROR){
206
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
167
gpgme_strsource(rc), gpgme_strerror(rc));
208
return false;
168
return -1;
209
169
}
210
170
while(engine_info != NULL){
211
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
212
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
213
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
214
174
break;
215
175
}
216
176
engine_info = engine_info->next;
217
177
}
218
178
if(engine_info == NULL){
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");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
254
181
}
255
182
256
183
/* Create new GPGME data buffer from memory cryptotext */
271
198
return -1;
272
199
}
273
200
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
274
210
/* Decrypt data from the cryptotext data buffer to the plaintext
275
211
data buffer */
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
277
213
if (rc != GPG_ERR_NO_ERROR){
278
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
215
gpgme_strsource(rc), gpgme_strerror(rc));
280
216
plaintext_length = -1;
281
if (debug){
282
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if (result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
} else {
287
fprintf(stderr, "Unsupported algorithm: %s\n",
288
result->unsupported_algorithm);
289
fprintf(stderr, "Wrong key usage: %u\n",
290
result->wrong_key_usage);
291
if(result->file_name != NULL){
292
fprintf(stderr, "File name: %s\n", result->file_name);
293
}
294
gpgme_recipient_t recipient;
295
recipient = result->recipients;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
306
}
307
}
308
}
309
217
goto decrypt_end;
310
218
}
311
219
313
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
314
222
}
315
223
224
if (debug){
225
gpgme_decrypt_result_t result;
226
result = gpgme_op_decrypt_result(ctx);
227
if (result == NULL){
228
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
229
} else {
230
fprintf(stderr, "Unsupported algorithm: %s\n",
231
result->unsupported_algorithm);
232
fprintf(stderr, "Wrong key usage: %u\n",
233
result->wrong_key_usage);
234
if(result->file_name != NULL){
235
fprintf(stderr, "File name: %s\n", result->file_name);
236
}
237
gpgme_recipient_t recipient;
238
recipient = result->recipients;
239
if(recipient){
240
while(recipient != NULL){
241
fprintf(stderr, "Public key algorithm: %s\n",
242
gpgme_pubkey_algo_name(recipient->pubkey_algo));
243
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
244
fprintf(stderr, "Secret key available: %s\n",
245
recipient->status == GPG_ERR_NO_SECKEY
246
? "No" : "Yes");
247
recipient = recipient->next;
248
}
249
}
250
}
251
}
252
316
253
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
318
255
perror("pgpme_data_seek");
345
282
}
346
283
plaintext_length += ret;
347
284
}
348
285
349
286
if(debug){
350
287
fprintf(stderr, "Decrypted password is: ");
351
288
for(ssize_t i = 0; i < plaintext_length; i++){
412
349
}
413
350
414
351
if(debug){
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
352
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
353
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
417
354
seckeyfilename);
418
355
}
419
356
424
361
fprintf(stderr,
425
362
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
363
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
364
fprintf(stdout, "The GnuTLS error is: %s\n",
428
365
safer_gnutls_strerror(ret));
429
366
goto globalfail;
430
367
}
444
381
}
445
382
446
383
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
447
384
448
385
return 0;
449
386
450
387
globalfail:
451
388
452
389
gnutls_certificate_free_credentials(mc->cred);
453
390
gnutls_global_deinit();
454
391
return -1;
392
455
393
}
456
394
457
395
static int init_gnutls_session(mandos_context *mc,
529
467
perror("socket");
530
468
return -1;
531
469
}
532
470
533
471
if(debug){
534
472
if(if_indextoname((unsigned int)if_index, interface) == NULL){
535
473
perror("if_indextoname");
574
512
perror("connect");
575
513
return -1;
576
514
}
577
515
578
516
const char *out = mandos_protocol_version;
579
517
written = 0;
580
518
while (true){
598
536
}
599
537
}
600
538
}
601
539
602
540
if(debug){
603
541
fprintf(stderr, "Establishing TLS session with %s\n", ip);
604
542
}
605
543
606
544
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
607
545
608
546
do{
609
547
ret = gnutls_handshake (session);
610
548
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
624
562
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
625
563
ip);
626
564
}
627
565
628
566
while(true){
629
567
buffer_capacity = adjustbuffer(&buffer, buffer_length,
630
568
buffer_capacity);
674
612
gnutls_bye (session, GNUTLS_SHUT_RDWR);
675
613
676
614
if (buffer_length > 0){
677
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
615
decrypted_buffer_size = pgp_packet_decrypt(buffer,
678
616
buffer_length,
679
&decrypted_buffer);
617
&decrypted_buffer,
618
keydir);
680
619
if (decrypted_buffer_size >= 0){
681
620
written = 0;
682
621
while(written < (size_t) decrypted_buffer_size){
705
644
706
645
mandos_end:
707
646
free(buffer);
708
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
709
if(ret == -1){
710
perror("close");
711
}
647
close(tcp_sd);
712
648
gnutls_deinit (session);
713
649
return retval;
714
650
}
810
746
}
811
747
}
812
748
749
/* Combines file name and path and returns the malloced new
750
string. some sane checks could/should be added */
751
static char *combinepath(const char *first, const char *second){
752
char *tmp;
753
int ret = asprintf(&tmp, "%s/%s", first, second);
754
if(ret < 0){
755
return NULL;
756
}
757
return tmp;
758
}
759
760
813
761
int main(int argc, char *argv[]){
814
762
AvahiSServiceBrowser *sb = NULL;
815
763
int error;
821
769
uid_t uid;
822
770
gid_t gid;
823
771
char *connect_to = NULL;
824
char tempdir[] = "/tmp/mandosXXXXXX";
825
772
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
826
const char *seckey = PATHDIR "/" SECKEY;
827
const char *pubkey = PATHDIR "/" PUBKEY;
828
773
char *pubkeyfilename = NULL;
774
char *seckeyfilename = NULL;
775
const char *pubkeyname = "pubkey.txt";
776
const char *seckeyname = "seckey.txt";
829
777
mandos_context mc = { .simple_poll = NULL, .server = NULL,
830
.dh_bits = 1024, .priority = "SECURE256"
831
":!CTYPE-X.509:+CTYPE-OPENPGP" };
778
.dh_bits = 1024, .priority = "SECURE256"};
832
779
bool gnutls_initalized = false;
833
bool pgpme_initalized = false;
834
780
835
781
{
836
782
struct argp_option options[] = {
837
783
{ .name = "debug", .key = 128,
838
784
.doc = "Debug mode", .group = 3 },
839
785
{ .name = "connect", .key = 'c',
840
.arg = "ADDRESS:PORT",
841
.doc = "Connect directly to a specific Mandos server",
786
.arg = "IP",
787
.doc = "Connect directly to a sepcified mandos server",
842
788
.group = 1 },
843
789
{ .name = "interface", .key = 'i',
844
.arg = "NAME",
845
.doc = "Interface that will be used to search for Mandos"
846
" servers",
790
.arg = "INTERFACE",
791
.doc = "Interface that Avahi will conntect through",
792
.group = 1 },
793
{ .name = "keydir", .key = 'd',
794
.arg = "KEYDIR",
795
.doc = "Directory where the openpgp keyring is",
847
796
.group = 1 },
848
797
{ .name = "seckey", .key = 's',
849
.arg = "FILE",
850
.doc = "OpenPGP secret key file base name",
798
.arg = "SECKEY",
799
.doc = "Secret openpgp key for gnutls authentication",
851
800
.group = 1 },
852
801
{ .name = "pubkey", .key = 'p',
853
.arg = "FILE",
854
.doc = "OpenPGP public key file base name",
802
.arg = "PUBKEY",
803
.doc = "Public openpgp key for gnutls authentication",
855
804
.group = 2 },
856
805
{ .name = "dh-bits", .key = 129,
857
806
.arg = "BITS",
858
.doc = "Bit length of the prime number used in the"
859
" Diffie-Hellman key exchange",
807
.doc = "dh-bits to use in gnutls communication",
860
808
.group = 2 },
861
809
{ .name = "priority", .key = 130,
862
.arg = "STRING",
863
.doc = "GnuTLS priority string for the TLS handshake",
864
.group = 1 },
810
.arg = "PRIORITY",
811
.doc = "GNUTLS priority", .group = 1 },
865
812
{ .name = NULL }
866
813
};
814
867
815
868
816
error_t parse_opt (int key, char *arg,
869
817
struct argp_state *state) {
870
818
/* Get the INPUT argument from `argp_parse', which we know is
871
819
a pointer to our plugin list pointer. */
872
820
switch (key) {
873
case 128: /* --debug */
821
case 128:
874
822
debug = true;
875
823
break;
876
case 'c': /* --connect */
824
case 'c':
877
825
connect_to = arg;
878
826
break;
879
case 'i': /* --interface */
827
case 'i':
880
828
interface = arg;
881
829
break;
882
case 's': /* --seckey */
883
seckey = arg;
884
break;
885
case 'p': /* --pubkey */
886
pubkey = arg;
887
break;
888
case 129: /* --dh-bits */
830
case 'd':
831
keydir = arg;
832
break;
833
case 's':
834
seckeyname = arg;
835
break;
836
case 'p':
837
pubkeyname = arg;
838
break;
839
case 129:
889
840
errno = 0;
890
841
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
891
842
if (errno){
893
844
exit(EXIT_FAILURE);
894
845
}
895
846
break;
896
case 130: /* --priority */
847
case 130:
897
848
mc.priority = arg;
898
849
break;
899
850
case ARGP_KEY_ARG:
905
856
}
906
857
return 0;
907
858
}
908
859
909
860
struct argp argp = { .options = options, .parser = parse_opt,
910
861
.args_doc = "",
911
862
.doc = "Mandos client -- Get and decrypt"
912
" passwords from a Mandos server" };
863
" passwords from mandos server" };
913
864
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
914
865
if (ret == ARGP_ERR_UNKNOWN){
915
866
fprintf(stderr, "Unknown error while parsing arguments\n");
917
868
goto end;
918
869
}
919
870
}
871
872
pubkeyfilename = combinepath(keydir, pubkeyname);
873
if (pubkeyfilename == NULL){
874
perror("combinepath");
875
exitcode = EXIT_FAILURE;
876
goto end;
877
}
920
878
921
ret = init_gnutls_global(&mc, pubkey, seckey);
879
seckeyfilename = combinepath(keydir, seckeyname);
880
if (seckeyfilename == NULL){
881
perror("combinepath");
882
exitcode = EXIT_FAILURE;
883
goto end;
884
}
885
886
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
922
887
if (ret == -1){
923
888
fprintf(stderr, "init_gnutls_global failed\n");
924
889
exitcode = EXIT_FAILURE;
926
891
} else {
927
892
gnutls_initalized = true;
928
893
}
929
930
if(mkdtemp(tempdir) == NULL){
931
perror("mkdtemp");
932
tempdir[0] = '\0';
933
goto end;
934
}
935
936
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
937
fprintf(stderr, "pgpme_initalized failed\n");
938
exitcode = EXIT_FAILURE;
939
goto end;
940
} else {
941
pgpme_initalized = true;
942
}
943
894
944
895
/* If the interface is down, bring it up */
945
896
{
965
916
goto end;
966
917
}
967
918
}
968
ret = TEMP_FAILURE_RETRY(close(sd));
969
if(ret == -1){
970
perror("close");
971
}
919
close(sd);
972
920
}
973
921
974
922
uid = getuid();
1032
980
exitcode = EXIT_FAILURE;
1033
981
goto end;
1034
982
}
1035
983
1036
984
{
1037
985
AvahiServerConfig config;
1038
986
/* Do not publish any local Zeroconf records */
1041
989
config.publish_addresses = 0;
1042
990
config.publish_workstation = 0;
1043
991
config.publish_domain = 0;
1044
992
1045
993
/* Allocate a new server */
1046
994
mc.server = avahi_server_new(avahi_simple_poll_get
1047
995
(mc.simple_poll), &config, NULL,
1048
996
NULL, &error);
1049
997
1050
998
/* Free the Avahi configuration data */
1051
999
avahi_server_config_free(&config);
1052
1000
}
1072
1020
}
1073
1021
1074
1022
/* Run the main loop */
1075
1023
1076
1024
if (debug){
1077
1025
fprintf(stderr, "Starting Avahi loop search\n");
1078
1026
}
1080
1028
avahi_simple_poll_loop(mc.simple_poll);
1081
1029
1082
1030
end:
1083
1031
1084
1032
if (debug){
1085
1033
fprintf(stderr, "%s exiting\n", argv[0]);
1086
1034
}
1091
1039
1092
1040
if (mc.server != NULL)
1093
1041
avahi_server_free(mc.server);
1094
1042
1095
1043
if (mc.simple_poll != NULL)
1096
1044
avahi_simple_poll_free(mc.simple_poll);
1097
1045
free(pubkeyfilename);
1046
free(seckeyfilename);
1047
1098
1048
if (gnutls_initalized){
1099
1049
gnutls_certificate_free_credentials(mc.cred);
1100
1050
gnutls_global_deinit ();
1101
1051
}
1102
1103
if(pgpme_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
}
1137
ret = rmdir(tempdir);
1138
if(ret == -1){
1139
perror("rmdir");
1140
}
1141
}
1142
1052
1143
1053
return exitcode;
1144
1054
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0