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- Committer: Teddy Hogeborn
- Date: 2008-09-03 05:08:24 UTC
- Revision ID: teddy@fukt.bsnet.se-20080903050824-x38ghzu01vkfrpb4
* plugins.d/password-request.xml (OVERVIEW): Improved wording.
(EXIT STATUS): Fixed typos.
(EXIT STATUS): Fixed typos.
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
217
if (debug){
282
218
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
219
result = gpgme_op_decrypt_result(ctx);
284
220
if (result == NULL){
285
221
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
222
} else {
412
348
}
413
349
414
350
if(debug){
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
417
353
seckeyfilename);
418
354
}
419
355
424
360
fprintf(stderr,
425
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
363
fprintf(stdout, "The GnuTLS error is: %s\n",
428
364
safer_gnutls_strerror(ret));
429
365
goto globalfail;
430
366
}
674
610
gnutls_bye (session, GNUTLS_SHUT_RDWR);
675
611
676
612
if (buffer_length > 0){
677
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
613
decrypted_buffer_size = pgp_packet_decrypt(buffer,
678
614
buffer_length,
679
&decrypted_buffer);
615
&decrypted_buffer,
616
keydir);
680
617
if (decrypted_buffer_size >= 0){
681
618
written = 0;
682
619
while(written < (size_t) decrypted_buffer_size){
705
642
706
643
mandos_end:
707
644
free(buffer);
708
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
709
if(ret == -1){
710
perror("close");
711
}
645
close(tcp_sd);
712
646
gnutls_deinit (session);
713
647
return retval;
714
648
}
810
744
}
811
745
}
812
746
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
813
759
int main(int argc, char *argv[]){
814
760
AvahiSServiceBrowser *sb = NULL;
815
761
int error;
821
767
uid_t uid;
822
768
gid_t gid;
823
769
char *connect_to = NULL;
824
char tempdir[] = "/tmp/mandosXXXXXX";
825
770
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
826
const char *seckey = PATHDIR "/" SECKEY;
827
const char *pubkey = PATHDIR "/" PUBKEY;
828
771
char *pubkeyfilename = NULL;
772
char *seckeyfilename = NULL;
773
const char *pubkeyname = "pubkey.txt";
774
const char *seckeyname = "seckey.txt";
829
775
mandos_context mc = { .simple_poll = NULL, .server = NULL,
830
776
.dh_bits = 1024, .priority = "SECURE256"
831
777
":!CTYPE-X.509:+CTYPE-OPENPGP" };
832
778
bool gnutls_initalized = false;
833
bool pgpme_initalized = false;
834
779
835
780
{
836
781
struct argp_option options[] = {
845
790
.doc = "Interface that will be used to search for Mandos"
846
791
" servers",
847
792
.group = 1 },
793
{ .name = "keydir", .key = 'd',
794
.arg = "DIRECTORY",
795
.doc = "Directory to read the OpenPGP key files from",
796
.group = 1 },
848
797
{ .name = "seckey", .key = 's',
849
798
.arg = "FILE",
850
799
.doc = "OpenPGP secret key file base name",
879
828
case 'i': /* --interface */
880
829
interface = arg;
881
830
break;
831
case 'd': /* --keydir */
832
keydir = arg;
833
break;
882
834
case 's': /* --seckey */
883
seckey = arg;
835
seckeyname = arg;
884
836
break;
885
837
case 'p': /* --pubkey */
886
pubkey = arg;
838
pubkeyname = arg;
887
839
break;
888
840
case 129: /* --dh-bits */
889
841
errno = 0;
918
870
}
919
871
}
920
872
921
ret = init_gnutls_global(&mc, pubkey, seckey);
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);
922
888
if (ret == -1){
923
889
fprintf(stderr, "init_gnutls_global failed\n");
924
890
exitcode = EXIT_FAILURE;
926
892
} else {
927
893
gnutls_initalized = true;
928
894
}
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
895
944
896
/* If the interface is down, bring it up */
945
897
{
965
917
goto end;
966
918
}
967
919
}
968
ret = TEMP_FAILURE_RETRY(close(sd));
969
if(ret == -1){
970
perror("close");
971
}
920
close(sd);
972
921
}
973
922
974
923
uid = getuid();
1094
1043
1095
1044
if (mc.simple_poll != NULL)
1096
1045
avahi_simple_poll_free(mc.simple_poll);
1046
free(pubkeyfilename);
1047
free(seckeyfilename);
1097
1048
1098
1049
if (gnutls_initalized){
1099
1050
gnutls_certificate_free_credentials(mc.cred);
1100
1051
gnutls_global_deinit ();
1101
1052
}
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
1053
1143
1054
return exitcode;
1144
1055
}
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Version: 2.0.2.dev0