116
277
/* Create new empty GPGME data buffer for the plaintext */
117
278
rc = gpgme_data_new(&dh_plain);
118
if (rc != GPG_ERR_NO_ERROR){
279
if(rc != GPG_ERR_NO_ERROR){
119
280
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
120
281
gpgme_strsource(rc), gpgme_strerror(rc));
124
/* Create new GPGME "context" */
125
rc = gpgme_new(&ctx);
126
if (rc != GPG_ERR_NO_ERROR){
127
fprintf(stderr, "bad gpgme_new: %s: %s\n",
128
gpgme_strsource(rc), gpgme_strerror(rc));
132
/* Decrypt data from the FILE pointer to the plaintext data buffer */
133
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
134
if (rc != GPG_ERR_NO_ERROR){
282
gpgme_data_release(dh_crypto);
286
/* Decrypt data from the cryptotext data buffer to the plaintext
288
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
289
if(rc != GPG_ERR_NO_ERROR){
135
290
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
136
291
gpgme_strsource(rc), gpgme_strerror(rc));
292
plaintext_length = -1;
294
gpgme_decrypt_result_t result;
295
result = gpgme_op_decrypt_result(mc.ctx);
297
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
299
fprintf(stderr, "Unsupported algorithm: %s\n",
300
result->unsupported_algorithm);
301
fprintf(stderr, "Wrong key usage: %u\n",
302
result->wrong_key_usage);
303
if(result->file_name != NULL){
304
fprintf(stderr, "File name: %s\n", result->file_name);
306
gpgme_recipient_t recipient;
307
recipient = result->recipients;
309
while(recipient != NULL){
310
fprintf(stderr, "Public key algorithm: %s\n",
311
gpgme_pubkey_algo_name(recipient->pubkey_algo));
312
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
313
fprintf(stderr, "Secret key available: %s\n",
314
recipient->status == GPG_ERR_NO_SECKEY
316
recipient = recipient->next;
141
fprintf(stderr, "decryption of gpg packet succeeded\n");
145
gpgme_decrypt_result_t result;
146
result = gpgme_op_decrypt_result(ctx);
148
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
150
fprintf(stderr, "Unsupported algorithm: %s\n", result->unsupported_algorithm);
151
fprintf(stderr, "Wrong key usage: %d\n", result->wrong_key_usage);
152
if(result->file_name != NULL){
153
fprintf(stderr, "File name: %s\n", result->file_name);
155
gpgme_recipient_t recipient;
156
recipient = result->recipients;
158
while(recipient != NULL){
159
fprintf(stderr, "Public key algorithm: %s\n",
160
gpgme_pubkey_algo_name(recipient->pubkey_algo));
161
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
162
fprintf(stderr, "Secret key available: %s\n",
163
recipient->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
164
recipient = recipient->next;
170
/* Delete the GPGME FILE pointer cryptotext data buffer */
171
gpgme_data_release(dh_crypto);
325
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
173
328
/* Seek back to the beginning of the GPGME plaintext data buffer */
174
gpgme_data_seek(dh_plain, 0, SEEK_SET);
329
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
330
perror("gpgme_data_seek");
331
plaintext_length = -1;
178
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
179
*new_packet = realloc(*new_packet, new_packet_capacity + BUFFER_SIZE);
180
if (*new_packet == NULL){
184
new_packet_capacity += BUFFER_SIZE;
337
plaintext_capacity = incbuffer(plaintext,
338
(size_t)plaintext_length,
340
if(plaintext_capacity == 0){
342
plaintext_length = -1;
187
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length, BUFFER_SIZE);
346
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
188
348
/* Print the data, if any */
190
/* If password is empty, then a incorrect error will be printed */
194
354
perror("gpgme_data_read");
355
plaintext_length = -1;
197
new_packet_length += ret;
358
plaintext_length += ret;
201
fprintf(stderr, "decrypted password is: %s\n", *new_packet);
362
fprintf(stderr, "Decrypted password is: ");
363
for(ssize_t i = 0; i < plaintext_length; i++){
364
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
366
fprintf(stderr, "\n");
204
/* Delete the GPGME plaintext data buffer */
371
/* Delete the GPGME cryptotext data buffer */
372
gpgme_data_release(dh_crypto);
374
/* Delete the GPGME plaintext data buffer */
205
375
gpgme_data_release(dh_plain);
206
return new_packet_length;
376
return plaintext_length;
209
static const char * safer_gnutls_strerror (int value) {
210
const char *ret = gnutls_strerror (value);
379
static const char * safer_gnutls_strerror(int value){
380
const char *ret = gnutls_strerror(value); /* Spurious warning from
381
-Wunreachable-code */
212
383
ret = "(unknown)";
216
void debuggnutls(int level, const char* string){
217
fprintf(stderr, "%s", string);
387
/* GnuTLS log function callback */
388
static void debuggnutls(__attribute__((unused)) int level,
390
fprintf(stderr, "GnuTLS: %s", string);
220
int initgnutls(encrypted_session *es){
393
static int init_gnutls_global(const char *pubkeyfilename,
394
const char *seckeyfilename){
225
fprintf(stderr, "Initializing gnutls\n");
398
fprintf(stderr, "Initializing GnuTLS\n");
229
if ((ret = gnutls_global_init ())
230
!= GNUTLS_E_SUCCESS) {
231
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
401
ret = gnutls_global_init();
402
if(ret != GNUTLS_E_SUCCESS){
403
fprintf(stderr, "GnuTLS global_init: %s\n",
404
safer_gnutls_strerror(ret));
409
/* "Use a log level over 10 to enable all debugging options."
236
412
gnutls_global_set_log_level(11);
237
413
gnutls_global_set_log_function(debuggnutls);
241
/* openpgp credentials */
242
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
243
!= GNUTLS_E_SUCCESS) {
244
fprintf (stderr, "memory error: %s\n", safer_gnutls_strerror(ret));
416
/* OpenPGP credentials */
417
gnutls_certificate_allocate_credentials(&mc.cred);
418
if(ret != GNUTLS_E_SUCCESS){
419
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
423
safer_gnutls_strerror(ret));
424
gnutls_global_deinit();
249
fprintf(stderr, "Attempting to use openpgp certificate %s"
250
" and keyfile %s as gnutls credentials\n", CERTFILE, KEYFILE);
429
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
430
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
253
434
ret = gnutls_certificate_set_openpgp_key_file
254
(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
255
if (ret != GNUTLS_E_SUCCESS) {
257
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s', '%s')\n",
258
ret, CERTFILE, KEYFILE);
259
fprintf(stdout, "The Error is: %s\n",
260
safer_gnutls_strerror(ret));
264
//Gnutls server initialization
265
if ((ret = gnutls_dh_params_init (&es->dh_params))
266
!= GNUTLS_E_SUCCESS) {
267
fprintf (stderr, "Error in dh parameter initialization: %s\n",
268
safer_gnutls_strerror(ret));
272
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
273
!= GNUTLS_E_SUCCESS) {
274
fprintf (stderr, "Error in prime generation: %s\n",
275
safer_gnutls_strerror(ret));
279
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
281
// Gnutls session creation
282
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
283
!= GNUTLS_E_SUCCESS){
284
fprintf(stderr, "Error in gnutls session initialization: %s\n",
285
safer_gnutls_strerror(ret));
288
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
289
!= GNUTLS_E_SUCCESS) {
290
fprintf(stderr, "Syntax error at: %s\n", err);
291
fprintf(stderr, "Gnutls error: %s\n",
292
safer_gnutls_strerror(ret));
296
if ((ret = gnutls_credentials_set
297
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
298
!= GNUTLS_E_SUCCESS) {
299
fprintf(stderr, "Error setting a credentials set: %s\n",
300
safer_gnutls_strerror(ret));
435
(mc.cred, pubkeyfilename, seckeyfilename,
436
GNUTLS_OPENPGP_FMT_BASE64);
437
if(ret != GNUTLS_E_SUCCESS){
439
"Error[%d] while reading the OpenPGP key pair ('%s',"
440
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
441
fprintf(stderr, "The GnuTLS error is: %s\n",
442
safer_gnutls_strerror(ret));
446
/* GnuTLS server initialization */
447
ret = gnutls_dh_params_init(&mc.dh_params);
448
if(ret != GNUTLS_E_SUCCESS){
449
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
450
" %s\n", safer_gnutls_strerror(ret));
453
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
454
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
456
safer_gnutls_strerror(ret));
460
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
466
gnutls_certificate_free_credentials(mc.cred);
467
gnutls_global_deinit();
468
gnutls_dh_params_deinit(mc.dh_params);
472
static int init_gnutls_session(gnutls_session_t *session){
474
/* GnuTLS session creation */
475
ret = gnutls_init(session, GNUTLS_SERVER);
476
if(ret != GNUTLS_E_SUCCESS){
477
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
478
safer_gnutls_strerror(ret));
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
484
if(ret != GNUTLS_E_SUCCESS){
485
fprintf(stderr, "Syntax error at: %s\n", err);
486
fprintf(stderr, "GnuTLS error: %s\n",
487
safer_gnutls_strerror(ret));
488
gnutls_deinit(*session);
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
495
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
497
safer_gnutls_strerror(ret));
498
gnutls_deinit(*session);
304
502
/* ignore client certificate if any. */
305
gnutls_certificate_server_set_request (es->session, GNUTLS_CERT_IGNORE);
503
gnutls_certificate_server_set_request(*session,
307
gnutls_dh_set_prime_bits (es->session, DH_BITS);
506
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
312
void empty_log(AvahiLogLevel level, const char *txt){}
511
/* Avahi log function callback */
512
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
513
__attribute__((unused)) const char *txt){}
314
int start_mandos_communcation(char *ip, uint16_t port){
515
/* Called when a Mandos server is found */
516
static int start_mandos_communication(const char *ip, uint16_t port,
517
AvahiIfIndex if_index,
316
struct sockaddr_in6 to;
317
encrypted_session es;
522
struct sockaddr_in in;
523
struct sockaddr_in6 in6;
318
525
char *buffer = NULL;
319
526
char *decrypted_buffer;
320
527
size_t buffer_length = 0;
321
528
size_t buffer_capacity = 0;
322
529
ssize_t decrypted_buffer_size;
324
const char interface[] = "eth0";
532
gnutls_session_t session;
533
int pf; /* Protocol family */
543
fprintf(stderr, "Bad address family: %d\n", af);
547
ret = init_gnutls_session(&session);
327
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
553
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
330
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
557
tcp_sd = socket(pf, SOCK_STREAM, 0);
332
559
perror("socket");
337
fprintf(stderr, "Binding to interface %s\n", interface);
340
ret = setsockopt(tcp_sd, SOL_SOCKET, SO_BINDTODEVICE, interface, 5);
342
perror("setsockopt bindtodevice");
346
memset(&to,0,sizeof(to));
347
to.sin6_family = AF_INET6;
348
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
563
memset(&to, 0, sizeof(to));
565
to.in6.sin6_family = (uint16_t)af;
566
ret = inet_pton(af, ip, &to.in6.sin6_addr);
568
to.in.sin_family = (sa_family_t)af;
569
ret = inet_pton(af, ip, &to.in.sin_addr);
350
572
perror("inet_pton");
354
576
fprintf(stderr, "Bad address: %s\n", ip);
357
to.sin6_port = htons(port);
358
to.sin6_scope_id = if_nametoindex(interface);
580
to.in6.sin6_port = htons(port); /* Spurious warnings from
582
-Wunreachable-code */
584
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
585
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
587
if(if_index == AVAHI_IF_UNSPEC){
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
589
" without a network interface\n");
592
/* Set the network interface number as scope */
593
to.in6.sin6_scope_id = (uint32_t)if_index;
596
to.in.sin_port = htons(port); /* Spurious warnings from
598
-Wunreachable-code */
361
fprintf(stderr, "Connection to: %s\n", ip);
602
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
603
char interface[IF_NAMESIZE];
604
if(if_indextoname((unsigned int)if_index, interface) == NULL){
605
perror("if_indextoname");
607
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
608
ip, interface, port);
611
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
614
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
615
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
618
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
621
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
627
if(strcmp(addrstr, ip) != 0){
628
fprintf(stderr, "Canonical address form: %s\n", addrstr);
364
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
634
ret = connect(tcp_sd, &to.in6, sizeof(to));
636
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
366
639
perror("connect");
370
ret = initgnutls (&es);
377
gnutls_transport_set_ptr (es.session, (gnutls_transport_ptr_t) tcp_sd);
380
fprintf(stderr, "Establishing tls session with %s\n", ip);
384
ret = gnutls_handshake (es.session);
386
if (ret != GNUTLS_E_SUCCESS){
387
fprintf(stderr, "\n*** Handshake failed ***\n");
393
//Retrieve gpg packet that contains the wanted password
396
fprintf(stderr, "Retrieving pgp encrypted password from %s\n", ip);
643
const char *out = mandos_protocol_version;
400
if (buffer_length + BUFFER_SIZE > buffer_capacity){
401
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
646
size_t out_size = strlen(out);
647
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
648
out_size - written));
654
written += (size_t)ret;
655
if(written < out_size){
658
if(out == mandos_protocol_version){
406
buffer_capacity += BUFFER_SIZE;
668
fprintf(stderr, "Establishing TLS session with %s\n", ip);
671
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
674
ret = gnutls_handshake(session);
675
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
677
if(ret != GNUTLS_E_SUCCESS){
679
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
686
/* Read OpenPGP packet that contains the wanted password */
689
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
694
buffer_capacity = incbuffer(&buffer, buffer_length,
696
if(buffer_capacity == 0){
409
ret = gnutls_record_recv
410
(es.session, buffer+buffer_length, BUFFER_SIZE);
702
sret = gnutls_record_recv(session, buffer+buffer_length,
416
709
case GNUTLS_E_INTERRUPTED:
417
710
case GNUTLS_E_AGAIN:
419
712
case GNUTLS_E_REHANDSHAKE:
420
ret = gnutls_handshake (es.session);
422
fprintf(stderr, "\n*** Handshake failed ***\n");
714
ret = gnutls_handshake(session);
715
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
717
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
429
fprintf(stderr, "Unknown error while reading data from encrypted session with mandos server\n");
724
fprintf(stderr, "Unknown error while reading data from"
725
" encrypted session with Mandos server\n");
431
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
727
gnutls_bye(session, GNUTLS_SHUT_RDWR);
435
buffer_length += ret;
731
buffer_length += (size_t) sret;
439
if (buffer_length > 0){
440
if ((decrypted_buffer_size = gpg_packet_decrypt(buffer, buffer_length, &decrypted_buffer, CERT_ROOT)) >= 0){
441
fwrite (decrypted_buffer, 1, decrypted_buffer_size, stdout);
736
fprintf(stderr, "Closing TLS session\n");
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
741
if(buffer_length > 0){
742
decrypted_buffer_size = pgp_packet_decrypt(buffer,
745
if(decrypted_buffer_size >= 0){
747
while(written < (size_t) decrypted_buffer_size){
748
ret = (int)fwrite(decrypted_buffer + written, 1,
749
(size_t)decrypted_buffer_size - written,
751
if(ret == 0 and ferror(stdout)){
753
fprintf(stderr, "Error writing encrypted data: %s\n",
759
written += (size_t)ret;
442
761
free(decrypted_buffer);
451
fprintf(stderr, "Closing tls session\n");
769
/* Shutdown procedure */
455
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
458
gnutls_deinit (es.session);
459
gnutls_certificate_free_credentials (es.cred);
460
gnutls_global_deinit ();
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
777
gnutls_deinit(session);
464
static AvahiSimplePoll *simple_poll = NULL;
465
static AvahiServer *server = NULL;
467
static void resolve_callback(
468
AvahiSServiceResolver *r,
469
AVAHI_GCC_UNUSED AvahiIfIndex interface,
470
AVAHI_GCC_UNUSED AvahiProtocol protocol,
471
AvahiResolverEvent event,
475
const char *host_name,
476
const AvahiAddress *address,
478
AvahiStringList *txt,
479
AvahiLookupResultFlags flags,
480
AVAHI_GCC_UNUSED void* userdata) {
484
/* Called whenever a service has been resolved successfully or timed out */
487
case AVAHI_RESOLVER_FAILURE:
488
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of type '%s' in domain '%s': %s\n", name, type, domain, avahi_strerror(avahi_server_errno(server)));
491
case AVAHI_RESOLVER_FOUND: {
492
char ip[AVAHI_ADDRESS_STR_MAX];
493
avahi_address_snprint(ip, sizeof(ip), address);
495
fprintf(stderr, "Mandos server found at %s on port %d\n", ip, port);
497
int ret = start_mandos_communcation(ip, port);
505
avahi_s_service_resolver_free(r);
508
static void browse_callback(
509
AvahiSServiceBrowser *b,
510
AvahiIfIndex interface,
511
AvahiProtocol protocol,
512
AvahiBrowserEvent event,
516
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
519
AvahiServer *s = userdata;
522
/* Called whenever a new services becomes available on the LAN or is removed from the LAN */
526
case AVAHI_BROWSER_FAILURE:
528
fprintf(stderr, "(Browser) %s\n", avahi_strerror(avahi_server_errno(server)));
529
avahi_simple_poll_quit(simple_poll);
532
case AVAHI_BROWSER_NEW:
533
/* We ignore the returned resolver object. In the callback
534
function we free it. If the server is terminated before
535
the callback function is called the server will free
536
the resolver for us. */
538
if (!(avahi_s_service_resolver_new(s, interface, protocol, name, type, domain, AVAHI_PROTO_INET6, 0, resolve_callback, s)))
539
fprintf(stderr, "Failed to resolve service '%s': %s\n", name, avahi_strerror(avahi_server_errno(s)));
543
case AVAHI_BROWSER_REMOVE:
546
case AVAHI_BROWSER_ALL_FOR_NOW:
547
case AVAHI_BROWSER_CACHE_EXHAUSTED:
552
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
781
static void resolve_callback(AvahiSServiceResolver *r,
782
AvahiIfIndex interface,
784
AvahiResolverEvent event,
788
const char *host_name,
789
const AvahiAddress *address,
791
AVAHI_GCC_UNUSED AvahiStringList *txt,
792
AVAHI_GCC_UNUSED AvahiLookupResultFlags
794
AVAHI_GCC_UNUSED void* userdata){
797
/* Called whenever a service has been resolved successfully or
802
case AVAHI_RESOLVER_FAILURE:
803
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
804
" of type '%s' in domain '%s': %s\n", name, type, domain,
805
avahi_strerror(avahi_server_errno(mc.server)));
808
case AVAHI_RESOLVER_FOUND:
810
char ip[AVAHI_ADDRESS_STR_MAX];
811
avahi_address_snprint(ip, sizeof(ip), address);
813
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
814
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
815
ip, (intmax_t)interface, port);
817
int ret = start_mandos_communication(ip, port, interface,
818
avahi_proto_to_af(proto));
820
avahi_simple_poll_quit(mc.simple_poll);
824
avahi_s_service_resolver_free(r);
827
static void browse_callback(AvahiSServiceBrowser *b,
828
AvahiIfIndex interface,
829
AvahiProtocol protocol,
830
AvahiBrowserEvent event,
834
AVAHI_GCC_UNUSED AvahiLookupResultFlags
836
AVAHI_GCC_UNUSED void* userdata){
839
/* Called whenever a new services becomes available on the LAN or
840
is removed from the LAN */
844
case AVAHI_BROWSER_FAILURE:
846
fprintf(stderr, "(Avahi browser) %s\n",
847
avahi_strerror(avahi_server_errno(mc.server)));
848
avahi_simple_poll_quit(mc.simple_poll);
851
case AVAHI_BROWSER_NEW:
852
/* We ignore the returned Avahi resolver object. In the callback
853
function we free it. If the Avahi server is terminated before
854
the callback function is called the Avahi server will free the
857
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
858
name, type, domain, protocol, 0,
859
resolve_callback, NULL) == NULL)
860
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
861
name, avahi_strerror(avahi_server_errno(mc.server)));
864
case AVAHI_BROWSER_REMOVE:
867
case AVAHI_BROWSER_ALL_FOR_NOW:
868
case AVAHI_BROWSER_CACHE_EXHAUSTED:
870
fprintf(stderr, "No Mandos server found, still searching...\n");
876
sig_atomic_t quit_now = 0;
878
/* stop main loop after sigterm has been called */
879
static void handle_sigterm(__attribute__((unused)) int sig){
884
int old_errno = errno;
885
if(mc.simple_poll != NULL){
886
avahi_simple_poll_quit(mc.simple_poll);
891
int main(int argc, char *argv[]){
892
AvahiSServiceBrowser *sb = NULL;
897
int exitcode = EXIT_SUCCESS;
898
const char *interface = "eth0";
899
struct ifreq network;
903
char *connect_to = NULL;
904
char tempdir[] = "/tmp/mandosXXXXXX";
905
bool tempdir_created = false;
906
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
907
const char *seckey = PATHDIR "/" SECKEY;
908
const char *pubkey = PATHDIR "/" PUBKEY;
910
bool gnutls_initialized = false;
911
bool gpgme_initialized = false;
914
struct sigaction old_sigterm_action;
915
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
918
struct argp_option options[] = {
919
{ .name = "debug", .key = 128,
920
.doc = "Debug mode", .group = 3 },
921
{ .name = "connect", .key = 'c',
922
.arg = "ADDRESS:PORT",
923
.doc = "Connect directly to a specific Mandos server",
925
{ .name = "interface", .key = 'i',
927
.doc = "Network interface that will be used to search for"
930
{ .name = "seckey", .key = 's',
932
.doc = "OpenPGP secret key file base name",
934
{ .name = "pubkey", .key = 'p',
936
.doc = "OpenPGP public key file base name",
938
{ .name = "dh-bits", .key = 129,
940
.doc = "Bit length of the prime number used in the"
941
" Diffie-Hellman key exchange",
943
{ .name = "priority", .key = 130,
945
.doc = "GnuTLS priority string for the TLS handshake",
947
{ .name = "delay", .key = 131,
949
.doc = "Maximum delay to wait for interface startup",
954
error_t parse_opt(int key, char *arg,
955
struct argp_state *state){
957
case 128: /* --debug */
960
case 'c': /* --connect */
963
case 'i': /* --interface */
966
case 's': /* --seckey */
969
case 'p': /* --pubkey */
972
case 129: /* --dh-bits */
974
tmpmax = strtoimax(arg, &tmp, 10);
975
if(errno != 0 or tmp == arg or *tmp != '\0'
976
or tmpmax != (typeof(mc.dh_bits))tmpmax){
977
fprintf(stderr, "Bad number of DH bits\n");
980
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
982
case 130: /* --priority */
985
case 131: /* --delay */
987
delay = strtof(arg, &tmp);
988
if(errno != 0 or tmp == arg or *tmp != '\0'){
989
fprintf(stderr, "Bad delay\n");
998
return ARGP_ERR_UNKNOWN;
1003
struct argp argp = { .options = options, .parser = parse_opt,
1005
.doc = "Mandos client -- Get and decrypt"
1006
" passwords from a Mandos server" };
1007
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1008
if(ret == ARGP_ERR_UNKNOWN){
1009
fprintf(stderr, "Unknown error while parsing arguments\n");
1010
exitcode = EXIT_FAILURE;
1016
avahi_set_log_function(empty_log);
1019
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1020
from the signal handler */
1021
/* Initialize the pseudo-RNG for Avahi */
1022
srand((unsigned int) time(NULL));
1023
mc.simple_poll = avahi_simple_poll_new();
1024
if(mc.simple_poll == NULL){
1025
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1026
exitcode = EXIT_FAILURE;
1030
sigemptyset(&sigterm_action.sa_mask);
1031
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1033
perror("sigaddset");
1034
exitcode = EXIT_FAILURE;
1037
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1039
perror("sigaddset");
1040
exitcode = EXIT_FAILURE;
1043
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1045
perror("sigaddset");
1046
exitcode = EXIT_FAILURE;
1049
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1051
perror("sigaction");
1052
exitcode = EXIT_FAILURE;
1056
/* If the interface is down, bring it up */
1057
if(interface[0] != '\0'){
1059
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1060
messages to mess up the prompt */
1061
ret = klogctl(8, NULL, 5);
1062
bool restore_loglevel = true;
1064
restore_loglevel = false;
1067
#endif /* __linux__ */
1069
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1072
exitcode = EXIT_FAILURE;
1074
if(restore_loglevel){
1075
ret = klogctl(7, NULL, 0);
1080
#endif /* __linux__ */
1083
strcpy(network.ifr_name, interface);
1084
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1086
perror("ioctl SIOCGIFFLAGS");
1088
if(restore_loglevel){
1089
ret = klogctl(7, NULL, 0);
1094
#endif /* __linux__ */
1095
exitcode = EXIT_FAILURE;
1098
if((network.ifr_flags & IFF_UP) == 0){
1099
network.ifr_flags |= IFF_UP;
1100
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1102
perror("ioctl SIOCSIFFLAGS");
1103
exitcode = EXIT_FAILURE;
1105
if(restore_loglevel){
1106
ret = klogctl(7, NULL, 0);
1111
#endif /* __linux__ */
1115
/* sleep checking until interface is running */
1116
for(int i=0; i < delay * 4; i++){
1117
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1119
perror("ioctl SIOCGIFFLAGS");
1120
} else if(network.ifr_flags & IFF_RUNNING){
1123
struct timespec sleeptime = { .tv_nsec = 250000000 };
1124
ret = nanosleep(&sleeptime, NULL);
1125
if(ret == -1 and errno != EINTR){
1126
perror("nanosleep");
1129
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(restore_loglevel){
1135
/* Restores kernel loglevel to default */
1136
ret = klogctl(7, NULL, 0);
1141
#endif /* __linux__ */
1158
ret = init_gnutls_global(pubkey, seckey);
1160
fprintf(stderr, "init_gnutls_global failed\n");
1161
exitcode = EXIT_FAILURE;
1164
gnutls_initialized = true;
1167
if(mkdtemp(tempdir) == NULL){
1171
tempdir_created = true;
1173
if(not init_gpgme(pubkey, seckey, tempdir)){
1174
fprintf(stderr, "init_gpgme failed\n");
1175
exitcode = EXIT_FAILURE;
1178
gpgme_initialized = true;
1181
if(interface[0] != '\0'){
1182
if_index = (AvahiIfIndex) if_nametoindex(interface);
1184
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1185
exitcode = EXIT_FAILURE;
1190
if(connect_to != NULL){
1191
/* Connect directly, do not use Zeroconf */
1192
/* (Mainly meant for debugging) */
1193
char *address = strrchr(connect_to, ':');
1194
if(address == NULL){
1195
fprintf(stderr, "No colon in address\n");
1196
exitcode = EXIT_FAILURE;
1201
tmpmax = strtoimax(address+1, &tmp, 10);
1202
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1203
or tmpmax != (uint16_t)tmpmax){
1204
fprintf(stderr, "Bad port number\n");
1205
exitcode = EXIT_FAILURE;
1208
port = (uint16_t)tmpmax;
1210
address = connect_to;
1211
/* Colon in address indicates IPv6 */
1213
if(strchr(address, ':') != NULL){
1218
ret = start_mandos_communication(address, port, if_index, af);
1220
exitcode = EXIT_FAILURE;
1222
exitcode = EXIT_SUCCESS;
553
1228
AvahiServerConfig config;
554
AvahiSServiceBrowser *sb = NULL;
555
const char db[] = "--debug";
558
int returncode = EXIT_SUCCESS;
559
char *basename = rindex(argv[0], '/');
560
if(basename == NULL){
566
char *program_name = malloc(strlen(basename) + sizeof(db));
568
if (program_name == NULL){
573
program_name[0] = '\0';
575
for (int i = 1; i < argc; i++){
576
if (not strncmp(argv[i], db, 5)){
577
strcat(strcat(strcat(program_name, db ), "="), basename);
578
if(not strcmp(argv[i], db) or not strcmp(argv[i], program_name)){
586
avahi_set_log_function(empty_log);
589
/* Initialize the psuedo-RNG */
592
/* Allocate main loop object */
593
if (!(simple_poll = avahi_simple_poll_new())) {
594
fprintf(stderr, "Failed to create simple poll object.\n");
599
/* Do not publish any local records */
1229
/* Do not publish any local Zeroconf records */
600
1230
avahi_server_config_init(&config);
601
1231
config.publish_hinfo = 0;
602
1232
config.publish_addresses = 0;
603
1233
config.publish_workstation = 0;
604
1234
config.publish_domain = 0;
606
1236
/* Allocate a new server */
607
server = avahi_server_new(avahi_simple_poll_get(simple_poll), &config, NULL, NULL, &error);
609
/* Free the configuration data */
1237
mc.server = avahi_server_new(avahi_simple_poll_get
1238
(mc.simple_poll), &config, NULL,
1241
/* Free the Avahi configuration data */
610
1242
avahi_server_config_free(&config);
612
/* Check if creating the server object succeeded */
614
fprintf(stderr, "Failed to create server: %s\n", avahi_strerror(error));
615
returncode = EXIT_FAILURE;
619
/* Create the service browser */
620
if (!(sb = avahi_s_service_browser_new(server, if_nametoindex("eth0"), AVAHI_PROTO_INET6, "_mandos._tcp", NULL, 0, browse_callback, server))) {
621
fprintf(stderr, "Failed to create service browser: %s\n", avahi_strerror(avahi_server_errno(server)));
622
returncode = EXIT_FAILURE;
626
/* Run the main loop */
629
fprintf(stderr, "Starting avahi loop search\n");
632
avahi_simple_poll_loop(simple_poll);
637
fprintf(stderr, "%s exiting\n", argv[0]);
642
avahi_s_service_browser_free(sb);
645
avahi_server_free(server);
648
avahi_simple_poll_free(simple_poll);
1245
/* Check if creating the Avahi server object succeeded */
1246
if(mc.server == NULL){
1247
fprintf(stderr, "Failed to create Avahi server: %s\n",
1248
avahi_strerror(error));
1249
exitcode = EXIT_FAILURE;
1253
/* Create the Avahi service browser */
1254
sb = avahi_s_service_browser_new(mc.server, if_index,
1255
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1256
NULL, 0, browse_callback, NULL);
1258
fprintf(stderr, "Failed to create service browser: %s\n",
1259
avahi_strerror(avahi_server_errno(mc.server)));
1260
exitcode = EXIT_FAILURE;
1264
/* Run the main loop */
1267
fprintf(stderr, "Starting Avahi loop search\n");
1270
avahi_simple_poll_loop(mc.simple_poll);
1275
fprintf(stderr, "%s exiting\n", argv[0]);
1278
/* Cleanup things */
1280
avahi_s_service_browser_free(sb);
1282
if(mc.server != NULL)
1283
avahi_server_free(mc.server);
1285
if(mc.simple_poll != NULL)
1286
avahi_simple_poll_free(mc.simple_poll);
1288
if(gnutls_initialized){
1289
gnutls_certificate_free_credentials(mc.cred);
1290
gnutls_global_deinit();
1291
gnutls_dh_params_deinit(mc.dh_params);
1294
if(gpgme_initialized){
1295
gpgme_release(mc.ctx);
1298
/* Removes the temp directory used by GPGME */
1299
if(tempdir_created){
1301
struct dirent *direntry;
1302
d = opendir(tempdir);
1304
if(errno != ENOENT){
1309
direntry = readdir(d);
1310
if(direntry == NULL){
1313
/* Skip "." and ".." */
1314
if(direntry->d_name[0] == '.'
1315
and (direntry->d_name[1] == '\0'
1316
or (direntry->d_name[1] == '.'
1317
and direntry->d_name[2] == '\0'))){
1320
char *fullname = NULL;
1321
ret = asprintf(&fullname, "%s/%s", tempdir,
1327
ret = remove(fullname);
1329
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1336
ret = rmdir(tempdir);
1337
if(ret == -1 and errno != ENOENT){