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- Committer: Teddy Hogeborn
- Date: 2008-09-05 18:37:28 UTC
- Revision ID: teddy@fukt.bsnet.se-20080905183728-l0m8v3vqa302uwrw
* mandos (main): Use EAFP with pidfile.
- files added:
- .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 */
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 "pupkey.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
114
const char *argp_program_version = "password-request 1.0";
105
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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;
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
}
149
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 */
155
195
gpgme_check_version(NULL);
156
196
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
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
163
/* Set GPGME home directory for the OpenPGP engine only */
202
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;
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
}
217
309
goto decrypt_end;
218
310
}
219
311
221
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
222
314
}
223
315
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
253
316
/* Seek back to the beginning of the GPGME plaintext data buffer */
254
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
318
perror("pgpme_data_seek");
282
345
}
283
346
plaintext_length += ret;
284
347
}
285
348
286
349
if(debug){
287
350
fprintf(stderr, "Decrypted password is: ");
288
351
for(ssize_t i = 0; i < plaintext_length; i++){
349
412
}
350
413
351
414
if(debug){
352
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
353
" 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,
354
417
seckeyfilename);
355
418
}
356
419
361
424
fprintf(stderr,
362
425
"Error[%d] while reading the OpenPGP key pair ('%s',"
363
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
364
fprintf(stdout, "The GnuTLS error is: %s\n",
427
fprintf(stderr, "The GnuTLS error is: %s\n",
365
428
safer_gnutls_strerror(ret));
366
429
goto globalfail;
367
430
}
381
444
}
382
445
383
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
384
447
385
448
return 0;
386
449
387
450
globalfail:
388
451
389
452
gnutls_certificate_free_credentials(mc->cred);
390
453
gnutls_global_deinit();
391
454
return -1;
392
393
455
}
394
456
395
457
static int init_gnutls_session(mandos_context *mc,
467
529
perror("socket");
468
530
return -1;
469
531
}
470
532
471
533
if(debug){
472
534
if(if_indextoname((unsigned int)if_index, interface) == NULL){
473
535
perror("if_indextoname");
512
574
perror("connect");
513
575
return -1;
514
576
}
515
577
516
578
const char *out = mandos_protocol_version;
517
579
written = 0;
518
580
while (true){
536
598
}
537
599
}
538
600
}
539
601
540
602
if(debug){
541
603
fprintf(stderr, "Establishing TLS session with %s\n", ip);
542
604
}
543
605
544
606
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
545
607
546
608
do{
547
609
ret = gnutls_handshake (session);
548
610
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
562
624
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
563
625
ip);
564
626
}
565
627
566
628
while(true){
567
629
buffer_capacity = adjustbuffer(&buffer, buffer_length,
568
630
buffer_capacity);
612
674
gnutls_bye (session, GNUTLS_SHUT_RDWR);
613
675
614
676
if (buffer_length > 0){
615
decrypted_buffer_size = pgp_packet_decrypt(buffer,
677
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
616
678
buffer_length,
617
&decrypted_buffer,
618
keydir);
679
&decrypted_buffer);
619
680
if (decrypted_buffer_size >= 0){
620
681
written = 0;
621
682
while(written < (size_t) decrypted_buffer_size){
636
697
} else {
637
698
retval = -1;
638
699
}
700
} else {
701
retval = -1;
639
702
}
640
703
641
704
/* Shutdown procedure */
642
705
643
706
mandos_end:
644
707
free(buffer);
645
close(tcp_sd);
708
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
709
if(ret == -1){
710
perror("close");
711
}
646
712
gnutls_deinit (session);
647
713
return retval;
648
714
}
744
810
}
745
811
}
746
812
747
/* Combines file name and path and returns the malloced new
748
string. some sane checks could/should be added */
749
static char *combinepath(const char *first, const char *second){
750
char *tmp;
751
int ret = asprintf(&tmp, "%s/%s", first, second);
752
if(ret < 0){
753
return NULL;
754
}
755
return tmp;
756
}
757
758
759
813
int main(int argc, char *argv[]){
760
814
AvahiSServiceBrowser *sb = NULL;
761
815
int error;
767
821
uid_t uid;
768
822
gid_t gid;
769
823
char *connect_to = NULL;
824
char tempdir[] = "/tmp/mandosXXXXXX";
770
825
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
771
char *pubkeyfilename = NULL;
772
char *seckeyfilename = NULL;
773
const char *pubkeyname = "pubkey.txt";
774
const char *seckeyname = "seckey.txt";
826
const char *seckey = PATHDIR "/" SECKEY;
827
const char *pubkey = PATHDIR "/" PUBKEY;
828
775
829
mandos_context mc = { .simple_poll = NULL, .server = NULL,
776
.dh_bits = 1024, .priority = "SECURE256"};
830
.dh_bits = 1024, .priority = "SECURE256"
831
":!CTYPE-X.509:+CTYPE-OPENPGP" };
777
832
bool gnutls_initalized = false;
833
bool pgpme_initalized = false;
778
834
779
835
{
780
836
struct argp_option options[] = {
781
837
{ .name = "debug", .key = 128,
782
838
.doc = "Debug mode", .group = 3 },
783
839
{ .name = "connect", .key = 'c',
784
.arg = "IP",
785
.doc = "Connect directly to a sepcified mandos server",
840
.arg = "ADDRESS:PORT",
841
.doc = "Connect directly to a specific Mandos server",
786
842
.group = 1 },
787
843
{ .name = "interface", .key = 'i',
788
.arg = "INTERFACE",
789
.doc = "Interface that Avahi will conntect through",
790
.group = 1 },
791
{ .name = "keydir", .key = 'd',
792
.arg = "KEYDIR",
793
.doc = "Directory where the openpgp keyring is",
844
.arg = "NAME",
845
.doc = "Interface that will be used to search for Mandos"
846
" servers",
794
847
.group = 1 },
795
848
{ .name = "seckey", .key = 's',
796
.arg = "SECKEY",
797
.doc = "Secret openpgp key for gnutls authentication",
849
.arg = "FILE",
850
.doc = "OpenPGP secret key file base name",
798
851
.group = 1 },
799
852
{ .name = "pubkey", .key = 'p',
800
.arg = "PUBKEY",
801
.doc = "Public openpgp key for gnutls authentication",
853
.arg = "FILE",
854
.doc = "OpenPGP public key file base name",
802
855
.group = 2 },
803
856
{ .name = "dh-bits", .key = 129,
804
857
.arg = "BITS",
805
.doc = "dh-bits to use in gnutls communication",
858
.doc = "Bit length of the prime number used in the"
859
" Diffie-Hellman key exchange",
806
860
.group = 2 },
807
861
{ .name = "priority", .key = 130,
808
.arg = "PRIORITY",
809
.doc = "GNUTLS priority", .group = 1 },
862
.arg = "STRING",
863
.doc = "GnuTLS priority string for the TLS handshake",
864
.group = 1 },
810
865
{ .name = NULL }
811
866
};
812
813
867
814
868
error_t parse_opt (int key, char *arg,
815
869
struct argp_state *state) {
816
870
/* Get the INPUT argument from `argp_parse', which we know is
817
871
a pointer to our plugin list pointer. */
818
872
switch (key) {
819
case 128:
873
case 128: /* --debug */
820
874
debug = true;
821
875
break;
822
case 'c':
876
case 'c': /* --connect */
823
877
connect_to = arg;
824
878
break;
825
case 'i':
879
case 'i': /* --interface */
826
880
interface = arg;
827
881
break;
828
case 'd':
829
keydir = arg;
830
break;
831
case 's':
832
seckeyname = arg;
833
break;
834
case 'p':
835
pubkeyname = arg;
836
break;
837
case 129:
882
case 's': /* --seckey */
883
seckey = arg;
884
break;
885
case 'p': /* --pubkey */
886
pubkey = arg;
887
break;
888
case 129: /* --dh-bits */
838
889
errno = 0;
839
890
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
840
891
if (errno){
842
893
exit(EXIT_FAILURE);
843
894
}
844
895
break;
845
case 130:
896
case 130: /* --priority */
846
897
mc.priority = arg;
847
898
break;
848
899
case ARGP_KEY_ARG:
854
905
}
855
906
return 0;
856
907
}
857
908
858
909
struct argp argp = { .options = options, .parser = parse_opt,
859
910
.args_doc = "",
860
911
.doc = "Mandos client -- Get and decrypt"
861
" passwords from mandos server" };
912
" passwords from a Mandos server" };
862
913
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
863
914
if (ret == ARGP_ERR_UNKNOWN){
864
915
fprintf(stderr, "Unknown error while parsing arguments\n");
866
917
goto end;
867
918
}
868
919
}
869
870
pubkeyfilename = combinepath(keydir, pubkeyname);
871
if (pubkeyfilename == NULL){
872
perror("combinepath");
873
exitcode = EXIT_FAILURE;
874
goto end;
875
}
876
920
877
seckeyfilename = combinepath(keydir, seckeyname);
878
if (seckeyfilename == NULL){
879
perror("combinepath");
880
exitcode = EXIT_FAILURE;
881
goto end;
882
}
883
884
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
921
ret = init_gnutls_global(&mc, pubkey, seckey);
885
922
if (ret == -1){
886
923
fprintf(stderr, "init_gnutls_global failed\n");
887
924
exitcode = EXIT_FAILURE;
889
926
} else {
890
927
gnutls_initalized = true;
891
928
}
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
}
892
943
893
944
/* If the interface is down, bring it up */
894
945
{
914
965
goto end;
915
966
}
916
967
}
917
close(sd);
968
ret = TEMP_FAILURE_RETRY(close(sd));
969
if(ret == -1){
970
perror("close");
971
}
918
972
}
919
973
920
974
uid = getuid();
978
1032
exitcode = EXIT_FAILURE;
979
1033
goto end;
980
1034
}
981
1035
982
1036
{
983
1037
AvahiServerConfig config;
984
1038
/* Do not publish any local Zeroconf records */
987
1041
config.publish_addresses = 0;
988
1042
config.publish_workstation = 0;
989
1043
config.publish_domain = 0;
990
1044
991
1045
/* Allocate a new server */
992
1046
mc.server = avahi_server_new(avahi_simple_poll_get
993
1047
(mc.simple_poll), &config, NULL,
994
1048
NULL, &error);
995
1049
996
1050
/* Free the Avahi configuration data */
997
1051
avahi_server_config_free(&config);
998
1052
}
1018
1072
}
1019
1073
1020
1074
/* Run the main loop */
1021
1075
1022
1076
if (debug){
1023
1077
fprintf(stderr, "Starting Avahi loop search\n");
1024
1078
}
1026
1080
avahi_simple_poll_loop(mc.simple_poll);
1027
1081
1028
1082
end:
1029
1083
1030
1084
if (debug){
1031
1085
fprintf(stderr, "%s exiting\n", argv[0]);
1032
1086
}
1037
1091
1038
1092
if (mc.server != NULL)
1039
1093
avahi_server_free(mc.server);
1040
1094
1041
1095
if (mc.simple_poll != NULL)
1042
1096
avahi_simple_poll_free(mc.simple_poll);
1043
free(pubkeyfilename);
1044
free(seckeyfilename);
1045
1097
1046
1098
if (gnutls_initalized){
1047
1099
gnutls_certificate_free_credentials(mc.cred);
1048
1100
gnutls_global_deinit ();
1049
1101
}
1050
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
1051
1143
return exitcode;
1052
1144
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0