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- Committer: Teddy Hogeborn
- Date: 2008-10-18 11:17:22 UTC
- Revision ID: teddy@fukt.bsnet.se-20081018111722-jtbz35c031lxuuc9
* debian/mandos-client.docs (NEWS): Added.
* debian/mandos.docs (NEWS): - '' -
* debian/mandos.docs (NEWS): - '' -
- 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 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
}
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
}
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
452
}
392
453
610
671
gnutls_bye (session, GNUTLS_SHUT_RDWR);
611
672
612
673
if (buffer_length > 0){
613
decrypted_buffer_size = pgp_packet_decrypt(buffer,
674
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
614
675
buffer_length,
615
&decrypted_buffer,
616
keydir);
676
&decrypted_buffer);
617
677
if (decrypted_buffer_size >= 0){
618
678
written = 0;
619
679
while(written < (size_t) decrypted_buffer_size){
642
702
643
703
mandos_end:
644
704
free(buffer);
645
close(tcp_sd);
705
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
706
if(ret == -1){
707
perror("close");
708
}
646
709
gnutls_deinit (session);
647
710
return retval;
648
711
}
744
807
}
745
808
}
746
809
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
810
int main(int argc, char *argv[]){
760
811
AvahiSServiceBrowser *sb = NULL;
761
812
int error;
767
818
uid_t uid;
768
819
gid_t gid;
769
820
char *connect_to = NULL;
821
char tempdir[] = "/tmp/mandosXXXXXX";
770
822
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";
823
const char *seckey = PATHDIR "/" SECKEY;
824
const char *pubkey = PATHDIR "/" PUBKEY;
825
775
826
mandos_context mc = { .simple_poll = NULL, .server = NULL,
776
827
.dh_bits = 1024, .priority = "SECURE256"
777
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[] = {
790
842
.doc = "Interface that will be used to search for Mandos"
791
843
" servers",
792
844
.group = 1 },
793
{ .name = "keydir", .key = 'd',
794
.arg = "DIRECTORY",
795
.doc = "Directory to read the OpenPGP key files from",
796
.group = 1 },
797
845
{ .name = "seckey", .key = 's',
798
846
.arg = "FILE",
799
847
.doc = "OpenPGP secret key file base name",
828
876
case 'i': /* --interface */
829
877
interface = arg;
830
878
break;
831
case 'd': /* --keydir */
832
keydir = arg;
833
break;
834
879
case 's': /* --seckey */
835
seckeyname = arg;
880
seckey = arg;
836
881
break;
837
882
case 'p': /* --pubkey */
838
pubkeyname = arg;
883
pubkey = arg;
839
884
break;
840
885
case 129: /* --dh-bits */
841
886
errno = 0;
870
915
}
871
916
}
872
917
873
pubkeyfilename = combinepath(keydir, pubkeyname);
874
if (pubkeyfilename == NULL){
875
perror("combinepath");
876
exitcode = EXIT_FAILURE;
877
goto end;
878
}
879
880
seckeyfilename = combinepath(keydir, seckeyname);
881
if (seckeyfilename == NULL){
882
perror("combinepath");
883
exitcode = EXIT_FAILURE;
884
goto end;
885
}
886
887
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
888
if (ret == -1){
889
fprintf(stderr, "init_gnutls_global failed\n");
890
exitcode = EXIT_FAILURE;
891
goto end;
892
} else {
893
gnutls_initalized = true;
894
}
895
896
918
/* If the interface is down, bring it up */
897
919
{
898
920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
917
939
goto end;
918
940
}
919
941
}
920
close(sd);
942
ret = TEMP_FAILURE_RETRY(close(sd));
943
if(ret == -1){
944
perror("close");
945
}
921
946
}
922
947
923
948
uid = getuid();
933
958
perror("setgid");
934
959
}
935
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
936
984
if_index = (AvahiIfIndex) if_nametoindex(interface);
937
985
if(if_index == 0){
938
986
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1043
1091
1044
1092
if (mc.simple_poll != NULL)
1045
1093
avahi_simple_poll_free(mc.simple_poll);
1046
free(pubkeyfilename);
1047
free(seckeyfilename);
1048
1094
1049
1095
if (gnutls_initalized){
1050
1096
gnutls_certificate_free_credentials(mc.cred);
1051
1097
gnutls_global_deinit ();
1052
}
1053
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
1054
1142
return exitcode;
1055
1143
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0