49
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
48
sockaddr_in6, PF_INET6,
51
49
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
54
#include <sys/stat.h> /* open() */
51
#include <inttypes.h> /* PRIu16 */
55
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
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struct in6_addr, inet_pton(),
58
#include <fcntl.h> /* open() */
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
55
#include <assert.h> /* assert() */
63
56
#include <errno.h> /* perror(), errno */
64
57
#include <time.h> /* time() */
65
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
66
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SIOCSIFFLAGS, if_indextoname(),
67
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if_nametoindex(), IF_NAMESIZE */
68
#include <netinet/in.h>
69
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
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getuid(), getgid(), setuid(),
64
#include <netinet/in.h>
72
65
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
66
#include <iso646.h> /* not, and */
74
67
#include <argp.h> /* struct argp_option, error_t, struct
75
68
argp_state, struct argp,
76
69
argp_parse(), ARGP_KEY_ARG,
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
149
static bool init_gpgme(mandos_context *mc, const char *seckey,
150
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;
152
144
gpgme_error_t rc;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
153
148
gpgme_engine_info_t engine_info;
157
* Helper function to insert pub and seckey to the engine keyring.
159
bool import_key(const char *filename){
161
gpgme_data_t pgp_data;
163
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
169
rc = gpgme_data_new_from_fd(&pgp_data, fd);
170
if(rc != GPG_ERR_NO_ERROR){
171
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
172
gpgme_strsource(rc), gpgme_strerror(rc));
176
rc = gpgme_op_import(mc->ctx, pgp_data);
177
if(rc != GPG_ERR_NO_ERROR){
178
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
179
gpgme_strsource(rc), gpgme_strerror(rc));
183
ret = (int)TEMP_FAILURE_RETRY(close(fd));
187
gpgme_data_release(pgp_data);
192
fprintf(stderr, "Initialize gpgme\n");
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
196
155
gpgme_check_version(NULL);
197
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
198
if(rc != GPG_ERR_NO_ERROR){
157
if (rc != GPG_ERR_NO_ERROR){
199
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
200
159
gpgme_strsource(rc), gpgme_strerror(rc));
204
/* Set GPGME home directory for the OpenPGP engine only */
205
rc = gpgme_get_engine_info(&engine_info);
206
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){
207
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
208
167
gpgme_strsource(rc), gpgme_strerror(rc));
211
170
while(engine_info != NULL){
212
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
213
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
214
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
217
176
engine_info = engine_info->next;
219
178
if(engine_info == NULL){
220
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
224
/* Create new GPGME "context" */
225
rc = gpgme_new(&(mc->ctx));
226
if(rc != GPG_ERR_NO_ERROR){
227
fprintf(stderr, "bad gpgme_new: %s: %s\n",
228
gpgme_strsource(rc), gpgme_strerror(rc));
232
if(not import_key(pubkey) or not import_key(seckey)){
240
* Decrypt OpenPGP data.
241
* Returns -1 on error
243
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
244
const char *cryptotext,
247
gpgme_data_t dh_crypto, dh_plain;
250
size_t plaintext_capacity = 0;
251
ssize_t plaintext_length = 0;
254
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
257
183
/* Create new GPGME data buffer from memory cryptotext */
258
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
260
if(rc != GPG_ERR_NO_ERROR){
186
if (rc != GPG_ERR_NO_ERROR){
261
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
262
188
gpgme_strsource(rc), gpgme_strerror(rc));
266
192
/* Create new empty GPGME data buffer for the plaintext */
267
193
rc = gpgme_data_new(&dh_plain);
268
if(rc != GPG_ERR_NO_ERROR){
194
if (rc != GPG_ERR_NO_ERROR){
269
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
270
196
gpgme_strsource(rc), gpgme_strerror(rc));
271
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;
275
210
/* Decrypt data from the cryptotext data buffer to the plaintext
277
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
278
if(rc != GPG_ERR_NO_ERROR){
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
279
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
280
215
gpgme_strsource(rc), gpgme_strerror(rc));
281
216
plaintext_length = -1;
283
218
gpgme_decrypt_result_t result;
284
result = gpgme_op_decrypt_result(mc->ctx);
219
result = gpgme_op_decrypt_result(ctx);
286
221
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
288
223
fprintf(stderr, "Unsupported algorithm: %s\n",
406
340
/* OpenPGP credentials */
407
341
gnutls_certificate_allocate_credentials(&mc->cred);
408
if(ret != GNUTLS_E_SUCCESS){
409
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
safer_gnutls_strerror(ret));
414
gnutls_global_deinit();
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
419
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
420
" 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,
424
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ret = gnutls_certificate_set_openpgp_key_file
425
357
(mc->cred, pubkeyfilename, seckeyfilename,
426
358
GNUTLS_OPENPGP_FMT_BASE64);
427
if(ret != GNUTLS_E_SUCCESS) {
359
if (ret != GNUTLS_E_SUCCESS) {
429
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
430
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
431
fprintf(stderr, "The GnuTLS error is: %s\n",
363
fprintf(stdout, "The GnuTLS error is: %s\n",
432
364
safer_gnutls_strerror(ret));
436
368
/* GnuTLS server initialization */
437
369
ret = gnutls_dh_params_init(&mc->dh_params);
438
if(ret != GNUTLS_E_SUCCESS) {
439
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
440
" %s\n", safer_gnutls_strerror(ret));
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
443
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
444
if(ret != GNUTLS_E_SUCCESS) {
445
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
446
safer_gnutls_strerror(ret));
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
474
405
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
475
if(ret != GNUTLS_E_SUCCESS) {
406
if (ret != GNUTLS_E_SUCCESS) {
476
407
fprintf(stderr, "Syntax error at: %s\n", err);
477
408
fprintf(stderr, "GnuTLS error: %s\n",
478
409
safer_gnutls_strerror(ret));
479
gnutls_deinit(*session);
410
gnutls_deinit (*session);
484
415
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
486
if(ret != GNUTLS_E_SUCCESS) {
417
if (ret != GNUTLS_E_SUCCESS) {
487
418
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
488
419
safer_gnutls_strerror(ret));
489
gnutls_deinit(*session);
420
gnutls_deinit (*session);
493
424
/* ignore client certificate if any. */
494
gnutls_certificate_server_set_request(*session,
425
gnutls_certificate_server_set_request (*session,
497
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
428
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
637
565
buffer_capacity = adjustbuffer(&buffer, buffer_length,
638
566
buffer_capacity);
639
if(buffer_capacity == 0){
567
if (buffer_capacity == 0){
640
568
perror("adjustbuffer");
645
sret = gnutls_record_recv(session, buffer+buffer_length,
573
ret = gnutls_record_recv(session, buffer+buffer_length,
652
580
case GNUTLS_E_INTERRUPTED:
653
581
case GNUTLS_E_AGAIN:
655
583
case GNUTLS_E_REHANDSHAKE:
657
ret = gnutls_handshake(session);
585
ret = gnutls_handshake (session);
658
586
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
660
588
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
679
607
fprintf(stderr, "Closing TLS session\n");
682
gnutls_bye(session, GNUTLS_SHUT_RDWR);
610
gnutls_bye (session, GNUTLS_SHUT_RDWR);
684
if(buffer_length > 0){
685
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
612
if (buffer_length > 0){
613
decrypted_buffer_size = pgp_packet_decrypt(buffer,
688
if(decrypted_buffer_size >= 0){
617
if (decrypted_buffer_size >= 0){
690
619
while(written < (size_t) decrypted_buffer_size){
691
ret = (int)fwrite(decrypted_buffer + written, 1,
692
(size_t)decrypted_buffer_size - written,
620
ret = (int)fwrite (decrypted_buffer + written, 1,
621
(size_t)decrypted_buffer_size - written,
694
623
if(ret == 0 and ferror(stdout)){
696
625
fprintf(stderr, "Error writing encrypted data: %s\n",
755
681
avahi_address_snprint(ip, sizeof(ip), address);
757
683
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
758
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
759
ip, (intmax_t)interface, port);
684
PRIu16 ") on port %d\n", name, host_name, ip,
761
687
int ret = start_mandos_communication(ip, port, interface, mc);
763
689
avahi_simple_poll_quit(mc->simple_poll);
833
769
char *connect_to = NULL;
834
char tempdir[] = "/tmp/mandosXXXXXX";
835
bool tempdir_created = false;
836
770
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
837
const char *seckey = PATHDIR "/" SECKEY;
838
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";
840
775
mandos_context mc = { .simple_poll = NULL, .server = NULL,
841
776
.dh_bits = 1024, .priority = "SECURE256"
842
777
":!CTYPE-X.509:+CTYPE-OPENPGP" };
843
bool gnutls_initialized = false;
844
bool gpgme_initialized = false;
778
bool gnutls_initalized = false;
847
781
struct argp_option options[] = {
921
863
.doc = "Mandos client -- Get and decrypt"
922
864
" passwords from a Mandos server" };
923
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
924
if(ret == ARGP_ERR_UNKNOWN){
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
925
867
fprintf(stderr, "Unknown error while parsing arguments\n");
926
868
exitcode = EXIT_FAILURE;
873
pubkeyfilename = combinepath(keydir, pubkeyname);
874
if (pubkeyfilename == NULL){
875
perror("combinepath");
876
exitcode = EXIT_FAILURE;
880
seckeyfilename = combinepath(keydir, seckeyname);
881
if (seckeyfilename == NULL){
882
perror("combinepath");
883
exitcode = EXIT_FAILURE;
887
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
889
fprintf(stderr, "init_gnutls_global failed\n");
890
exitcode = EXIT_FAILURE;
893
gnutls_initalized = true;
931
896
/* If the interface is down, bring it up */
933
898
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
955
ret = (int)TEMP_FAILURE_RETRY(close(sd));
966
933
perror("setgid");
974
ret = init_gnutls_global(&mc, pubkey, seckey);
976
fprintf(stderr, "init_gnutls_global failed\n");
977
exitcode = EXIT_FAILURE;
980
gnutls_initialized = true;
983
if(mkdtemp(tempdir) == NULL){
987
tempdir_created = true;
989
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
990
fprintf(stderr, "init_gpgme failed\n");
991
exitcode = EXIT_FAILURE;
994
gpgme_initialized = true;
997
936
if_index = (AvahiIfIndex) if_nametoindex(interface);
998
937
if(if_index == 0){
999
938
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1000
exitcode = EXIT_FAILURE;
1004
942
if(connect_to != NULL){
1098
1034
fprintf(stderr, "%s exiting\n", argv[0]);
1101
1037
/* Cleanup things */
1103
1039
avahi_s_service_browser_free(sb);
1105
if(mc.server != NULL)
1041
if (mc.server != NULL)
1106
1042
avahi_server_free(mc.server);
1108
if(mc.simple_poll != NULL)
1044
if (mc.simple_poll != NULL)
1109
1045
avahi_simple_poll_free(mc.simple_poll);
1046
free(pubkeyfilename);
1047
free(seckeyfilename);
1111
if(gnutls_initialized){
1049
if (gnutls_initalized){
1112
1050
gnutls_certificate_free_credentials(mc.cred);
1113
gnutls_global_deinit();
1114
gnutls_dh_params_deinit(mc.dh_params);
1117
if(gpgme_initialized){
1118
gpgme_release(mc.ctx);
1121
/* Removes the temp directory used by GPGME */
1122
if(tempdir_created){
1124
struct dirent *direntry;
1125
d = opendir(tempdir);
1127
if(errno != ENOENT){
1132
direntry = readdir(d);
1133
if(direntry == NULL){
1136
/* Skip "." and ".." */
1137
if(direntry->d_name[0] == '.'
1138
and (direntry->d_name[1] == '\0'
1139
or (direntry->d_name[1] == '.'
1140
and direntry->d_name[2] == '\0'))){
1143
char *fullname = NULL;
1144
ret = asprintf(&fullname, "%s/%s", tempdir,
1150
ret = remove(fullname);
1152
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1159
ret = rmdir(tempdir);
1160
if(ret == -1 and errno != ENOENT){
1051
gnutls_global_deinit ();
1165
1054
return exitcode;