48
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
48
sockaddr_in6, PF_INET6,
50
49
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(),
53
#include <sys/stat.h> /* open() */
51
#include <inttypes.h> /* PRIu16 */
54
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
53
struct in6_addr, inet_pton(),
57
#include <fcntl.h> /* open() */
58
#include <dirent.h> /* opendir(), struct dirent, readdir()
60
#include <inttypes.h> /* PRIu16, SCNu16 */
61
55
#include <assert.h> /* assert() */
62
56
#include <errno.h> /* perror(), errno */
63
57
#include <time.h> /* time() */
64
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
65
59
SIOCSIFFLAGS, if_indextoname(),
66
60
if_nametoindex(), IF_NAMESIZE */
67
#include <netinet/in.h>
68
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
69
62
getuid(), getgid(), setuid(),
64
#include <netinet/in.h>
71
65
#include <arpa/inet.h> /* inet_pton(), htons */
72
#include <iso646.h> /* not, and, or */
66
#include <iso646.h> /* not, and */
73
67
#include <argp.h> /* struct argp_option, error_t, struct
74
68
argp_state, struct argp,
75
69
argp_parse(), ARGP_KEY_ARG,
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
151
144
gpgme_error_t rc;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
152
148
gpgme_engine_info_t engine_info;
156
* Helper function to insert pub and seckey to the enigne keyring.
158
bool import_key(const char *filename){
160
gpgme_data_t pgp_data;
162
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
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));
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));
182
ret = (int)TEMP_FAILURE_RETRY(close(fd));
186
gpgme_data_release(pgp_data);
191
fprintf(stderr, "Initialize gpgme\n");
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
195
155
gpgme_check_version(NULL);
196
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
if(rc != GPG_ERR_NO_ERROR){
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));
203
/* Set GPGME home directory for the OpenPGP engine only */
204
rc = gpgme_get_engine_info(&engine_info);
205
if(rc != GPG_ERR_NO_ERROR){
163
/* Set GPGME home directory for the OpenPGP engine only */
164
rc = gpgme_get_engine_info (&engine_info);
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));
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);
216
176
engine_info = engine_info->next;
218
178
if(engine_info == NULL){
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
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));
231
if(not import_key(pubkey) or not import_key(seckey)){
239
* Decrypt OpenPGP data.
240
* Returns -1 on error
242
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
243
const char *cryptotext,
246
gpgme_data_t dh_crypto, dh_plain;
249
size_t plaintext_capacity = 0;
250
ssize_t plaintext_length = 0;
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
256
183
/* Create new GPGME data buffer from memory cryptotext */
257
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
259
if(rc != GPG_ERR_NO_ERROR){
186
if (rc != GPG_ERR_NO_ERROR){
260
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
188
gpgme_strsource(rc), gpgme_strerror(rc));
265
192
/* Create new empty GPGME data buffer for the plaintext */
266
193
rc = gpgme_data_new(&dh_plain);
267
if(rc != GPG_ERR_NO_ERROR){
194
if (rc != GPG_ERR_NO_ERROR){
268
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
196
gpgme_strsource(rc), gpgme_strerror(rc));
270
197
gpgme_data_release(dh_crypto);
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;
274
210
/* Decrypt data from the cryptotext data buffer to the plaintext
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if(rc != GPG_ERR_NO_ERROR){
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
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;
282
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
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);
294
gpgme_recipient_t recipient;
295
recipient = result->recipients;
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
304
recipient = recipient->next;
309
217
goto decrypt_end;
313
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
225
gpgme_decrypt_result_t result;
226
result = gpgme_op_decrypt_result(ctx);
228
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
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);
237
gpgme_recipient_t recipient;
238
recipient = result->recipients;
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
247
recipient = recipient->next;
316
253
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
318
perror("gpgme_data_seek");
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
319
256
plaintext_length = -1;
320
257
goto decrypt_end;
404
341
/* OpenPGP credentials */
405
342
gnutls_certificate_allocate_credentials(&mc->cred);
406
if(ret != GNUTLS_E_SUCCESS){
407
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious
409
safer_gnutls_strerror(ret));
410
gnutls_global_deinit();
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
346
safer_gnutls_strerror(ret));
347
gnutls_global_deinit ();
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,
420
357
ret = gnutls_certificate_set_openpgp_key_file
421
358
(mc->cred, pubkeyfilename, seckeyfilename,
422
359
GNUTLS_OPENPGP_FMT_BASE64);
423
if(ret != GNUTLS_E_SUCCESS) {
360
if (ret != GNUTLS_E_SUCCESS) {
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));
432
369
/* GnuTLS server initialization */
433
370
ret = gnutls_dh_params_init(&mc->dh_params);
434
if(ret != GNUTLS_E_SUCCESS) {
435
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
436
" %s\n", safer_gnutls_strerror(ret));
371
if (ret != GNUTLS_E_SUCCESS) {
372
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
373
" %s\n", safer_gnutls_strerror(ret));
439
376
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
440
if(ret != GNUTLS_E_SUCCESS) {
441
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
442
safer_gnutls_strerror(ret));
377
if (ret != GNUTLS_E_SUCCESS) {
378
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
379
safer_gnutls_strerror(ret));
446
383
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
452
389
gnutls_certificate_free_credentials(mc->cred);
453
390
gnutls_global_deinit();
454
gnutls_dh_params_deinit(mc->dh_params);
458
395
static int init_gnutls_session(mandos_context *mc,
470
407
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
471
if(ret != GNUTLS_E_SUCCESS) {
408
if (ret != GNUTLS_E_SUCCESS) {
472
409
fprintf(stderr, "Syntax error at: %s\n", err);
473
410
fprintf(stderr, "GnuTLS error: %s\n",
474
411
safer_gnutls_strerror(ret));
475
gnutls_deinit(*session);
412
gnutls_deinit (*session);
480
417
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
482
if(ret != GNUTLS_E_SUCCESS) {
419
if (ret != GNUTLS_E_SUCCESS) {
483
420
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
484
421
safer_gnutls_strerror(ret));
485
gnutls_deinit(*session);
422
gnutls_deinit (*session);
489
426
/* ignore client certificate if any. */
490
gnutls_certificate_server_set_request(*session,
427
gnutls_certificate_server_set_request (*session,
493
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
430
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
626
562
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
631
567
buffer_capacity = adjustbuffer(&buffer, buffer_length,
632
568
buffer_capacity);
633
if(buffer_capacity == 0){
569
if (buffer_capacity == 0){
634
570
perror("adjustbuffer");
639
sret = gnutls_record_recv(session, buffer+buffer_length,
575
ret = gnutls_record_recv(session, buffer+buffer_length,
646
582
case GNUTLS_E_INTERRUPTED:
647
583
case GNUTLS_E_AGAIN:
649
585
case GNUTLS_E_REHANDSHAKE:
651
ret = gnutls_handshake(session);
587
ret = gnutls_handshake (session);
652
588
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
654
590
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
673
609
fprintf(stderr, "Closing TLS session\n");
676
gnutls_bye(session, GNUTLS_SHUT_RDWR);
612
gnutls_bye (session, GNUTLS_SHUT_RDWR);
678
if(buffer_length > 0){
679
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
614
if (buffer_length > 0){
615
decrypted_buffer_size = pgp_packet_decrypt(buffer,
682
if(decrypted_buffer_size >= 0){
619
if (decrypted_buffer_size >= 0){
684
621
while(written < (size_t) decrypted_buffer_size){
685
ret = (int)fwrite(decrypted_buffer + written, 1,
686
(size_t)decrypted_buffer_size - written,
622
ret = (int)fwrite (decrypted_buffer + written, 1,
623
(size_t)decrypted_buffer_size - written,
688
625
if(ret == 0 and ferror(stdout)){
690
627
fprintf(stderr, "Error writing encrypted data: %s\n",
825
769
char *connect_to = NULL;
826
char tempdir[] = "/tmp/mandosXXXXXX";
827
770
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
828
const char *seckey = PATHDIR "/" SECKEY;
829
const char *pubkey = PATHDIR "/" PUBKEY;
771
char *pubkeyfilename = NULL;
772
char *seckeyfilename = NULL;
773
const char *pubkeyname = "pubkey.txt";
774
const char *seckeyname = "seckey.txt";
831
775
mandos_context mc = { .simple_poll = NULL, .server = NULL,
832
.dh_bits = 1024, .priority = "SECURE256"
833
":!CTYPE-X.509:+CTYPE-OPENPGP" };
776
.dh_bits = 1024, .priority = "SECURE256"};
834
777
bool gnutls_initalized = false;
835
bool gpgme_initalized = false;
838
780
struct argp_option options[] = {
839
781
{ .name = "debug", .key = 128,
840
782
.doc = "Debug mode", .group = 3 },
841
783
{ .name = "connect", .key = 'c',
842
.arg = "ADDRESS:PORT",
843
.doc = "Connect directly to a specific Mandos server",
785
.doc = "Connect directly to a sepcified mandos server",
845
787
{ .name = "interface", .key = 'i',
847
.doc = "Interface that will be used to search for Mandos"
789
.doc = "Interface that Avahi will conntect through",
791
{ .name = "keydir", .key = 'd',
793
.doc = "Directory where the openpgp keyring is",
850
795
{ .name = "seckey", .key = 's',
852
.doc = "OpenPGP secret key file base name",
797
.doc = "Secret openpgp key for gnutls authentication",
854
799
{ .name = "pubkey", .key = 'p',
856
.doc = "OpenPGP public key file base name",
801
.doc = "Public openpgp key for gnutls authentication",
858
803
{ .name = "dh-bits", .key = 129,
860
.doc = "Bit length of the prime number used in the"
861
" Diffie-Hellman key exchange",
805
.doc = "dh-bits to use in gnutls communication",
863
807
{ .name = "priority", .key = 130,
865
.doc = "GnuTLS priority string for the TLS handshake",
809
.doc = "GNUTLS priority", .group = 1 },
870
error_t parse_opt(int key, char *arg,
871
struct argp_state *state) {
873
case 128: /* --debug */
814
error_t parse_opt (int key, char *arg,
815
struct argp_state *state) {
816
/* Get the INPUT argument from `argp_parse', which we know is
817
a pointer to our plugin list pointer. */
876
case 'c': /* --connect */
877
823
connect_to = arg;
879
case 'i': /* --interface */
882
case 's': /* --seckey */
885
case 'p': /* --pubkey */
888
case 129: /* --dh-bits */
889
ret = sscanf(arg, "%u", &mc.dh_bits);
891
fprintf(stderr, "Bad number of DH bits\n");
839
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
892
842
exit(EXIT_FAILURE);
895
case 130: /* --priority */
896
846
mc.priority = arg;
898
848
case ARGP_KEY_ARG:
900
850
case ARGP_KEY_END:
908
858
struct argp argp = { .options = options, .parser = parse_opt,
910
860
.doc = "Mandos client -- Get and decrypt"
911
" passwords from a Mandos server" };
912
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
913
if(ret == ARGP_ERR_UNKNOWN){
861
" passwords from mandos server" };
862
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
863
if (ret == ARGP_ERR_UNKNOWN){
914
864
fprintf(stderr, "Unknown error while parsing arguments\n");
915
865
exitcode = EXIT_FAILURE;
870
pubkeyfilename = combinepath(keydir, pubkeyname);
871
if (pubkeyfilename == NULL){
872
perror("combinepath");
873
exitcode = EXIT_FAILURE;
877
seckeyfilename = combinepath(keydir, seckeyname);
878
if (seckeyfilename == NULL){
879
perror("combinepath");
880
exitcode = EXIT_FAILURE;
884
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
886
fprintf(stderr, "init_gnutls_global failed\n");
887
exitcode = EXIT_FAILURE;
890
gnutls_initalized = true;
920
893
/* If the interface is down, bring it up */
944
ret = (int)TEMP_FAILURE_RETRY(close(sd));
953
923
ret = setuid(uid);
955
925
perror("setuid");
960
930
perror("setgid");
963
ret = init_gnutls_global(&mc, pubkey, seckey);
965
fprintf(stderr, "init_gnutls_global failed\n");
966
exitcode = EXIT_FAILURE;
969
gnutls_initalized = true;
972
if(mkdtemp(tempdir) == NULL){
978
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
979
fprintf(stderr, "gpgme_initalized failed\n");
980
exitcode = EXIT_FAILURE;
983
gpgme_initalized = true;
986
933
if_index = (AvahiIfIndex) if_nametoindex(interface);
987
934
if(if_index == 0){
988
935
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1073
1020
/* Run the main loop */
1076
1023
fprintf(stderr, "Starting Avahi loop search\n");
1079
1026
avahi_simple_poll_loop(mc.simple_poll);
1084
1031
fprintf(stderr, "%s exiting\n", argv[0]);
1087
1034
/* Cleanup things */
1089
1036
avahi_s_service_browser_free(sb);
1091
if(mc.server != NULL)
1038
if (mc.server != NULL)
1092
1039
avahi_server_free(mc.server);
1094
if(mc.simple_poll != NULL)
1041
if (mc.simple_poll != NULL)
1095
1042
avahi_simple_poll_free(mc.simple_poll);
1097
if(gnutls_initalized){
1043
free(pubkeyfilename);
1044
free(seckeyfilename);
1046
if (gnutls_initalized){
1098
1047
gnutls_certificate_free_credentials(mc.cred);
1099
gnutls_global_deinit();
1100
gnutls_dh_params_deinit(mc.dh_params);
1103
if(gpgme_initalized){
1104
gpgme_release(mc.ctx);
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1113
if(errno != ENOENT){
1118
direntry = readdir(d);
1119
if(direntry == NULL){
1122
if(direntry->d_type == DT_REG){
1123
char *fullname = NULL;
1124
ret = asprintf(&fullname, "%s/%s", tempdir,
1130
ret = unlink(fullname);
1132
fprintf(stderr, "unlink(\"%s\"): %s",
1133
fullname, strerror(errno));
1140
ret = rmdir(tempdir);
1141
if(ret == -1 and errno != ENOENT){
1048
gnutls_global_deinit ();
1146
1051
return exitcode;