116
269
/* Create new empty GPGME data buffer for the plaintext */
117
270
rc = gpgme_data_new(&dh_plain);
118
if (rc != GPG_ERR_NO_ERROR){
271
if(rc != GPG_ERR_NO_ERROR){
119
272
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
120
273
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){
274
gpgme_data_release(dh_crypto);
278
/* Decrypt data from the cryptotext data buffer to the plaintext
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
281
if(rc != GPG_ERR_NO_ERROR){
135
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
136
283
gpgme_strsource(rc), gpgme_strerror(rc));
284
plaintext_length = -1;
286
gpgme_decrypt_result_t result;
287
result = gpgme_op_decrypt_result(mc->ctx);
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
291
fprintf(stderr, "Unsupported algorithm: %s\n",
292
result->unsupported_algorithm);
293
fprintf(stderr, "Wrong key usage: %u\n",
294
result->wrong_key_usage);
295
if(result->file_name != NULL){
296
fprintf(stderr, "File name: %s\n", result->file_name);
298
gpgme_recipient_t recipient;
299
recipient = result->recipients;
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
308
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);
317
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
173
320
/* Seek back to the beginning of the GPGME plaintext data buffer */
174
gpgme_data_seek(dh_plain, 0, SEEK_SET);
321
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
322
perror("gpgme_data_seek");
323
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;
329
plaintext_capacity = adjustbuffer(plaintext,
330
(size_t)plaintext_length,
332
if(plaintext_capacity == 0){
333
perror("adjustbuffer");
334
plaintext_length = -1;
187
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length, BUFFER_SIZE);
338
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
188
340
/* Print the data, if any */
190
/* If password is empty, then a incorrect error will be printed */
194
346
perror("gpgme_data_read");
347
plaintext_length = -1;
197
new_packet_length += ret;
350
plaintext_length += ret;
201
fprintf(stderr, "decrypted password is: %s\n", *new_packet);
354
fprintf(stderr, "Decrypted password is: ");
355
for(ssize_t i = 0; i < plaintext_length; i++){
356
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
358
fprintf(stderr, "\n");
204
/* Delete the GPGME plaintext data buffer */
363
/* Delete the GPGME cryptotext data buffer */
364
gpgme_data_release(dh_crypto);
366
/* Delete the GPGME plaintext data buffer */
205
367
gpgme_data_release(dh_plain);
206
return new_packet_length;
368
return plaintext_length;
209
static const char * safer_gnutls_strerror (int value) {
210
const char *ret = gnutls_strerror (value);
371
static const char * safer_gnutls_strerror(int value){
372
const char *ret = gnutls_strerror(value); /* Spurious warning from
373
-Wunreachable-code */
212
375
ret = "(unknown)";
216
void debuggnutls(int level, const char* string){
217
fprintf(stderr, "%s", string);
379
/* GnuTLS log function callback */
380
static void debuggnutls(__attribute__((unused)) int level,
382
fprintf(stderr, "GnuTLS: %s", string);
220
int initgnutls(encrypted_session *es){
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
387
const char *seckeyfilename){
225
fprintf(stderr, "Initializing gnutls\n");
391
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));
394
ret = gnutls_global_init();
395
if(ret != GNUTLS_E_SUCCESS){
396
fprintf(stderr, "GnuTLS global_init: %s\n",
397
safer_gnutls_strerror(ret));
402
/* "Use a log level over 10 to enable all debugging options."
236
405
gnutls_global_set_log_level(11);
237
406
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));
409
/* OpenPGP credentials */
410
gnutls_certificate_allocate_credentials(&mc->cred);
411
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
416
safer_gnutls_strerror(ret));
417
gnutls_global_deinit();
249
fprintf(stderr, "Attempting to use openpgp certificate %s"
250
" and keyfile %s as gnutls credentials\n", CERTFILE, KEYFILE);
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
253
427
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));
428
(mc->cred, pubkeyfilename, seckeyfilename,
429
GNUTLS_OPENPGP_FMT_BASE64);
430
if(ret != GNUTLS_E_SUCCESS){
432
"Error[%d] while reading the OpenPGP key pair ('%s',"
433
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
439
/* GnuTLS server initialization */
440
ret = gnutls_dh_params_init(&mc->dh_params);
441
if(ret != GNUTLS_E_SUCCESS){
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
" %s\n", safer_gnutls_strerror(ret));
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
447
if(ret != GNUTLS_E_SUCCESS){
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
safer_gnutls_strerror(ret));
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
459
gnutls_certificate_free_credentials(mc->cred);
460
gnutls_global_deinit();
461
gnutls_dh_params_deinit(mc->dh_params);
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
468
/* GnuTLS session creation */
469
ret = gnutls_init(session, GNUTLS_SERVER);
470
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
safer_gnutls_strerror(ret));
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
478
if(ret != GNUTLS_E_SUCCESS){
479
fprintf(stderr, "Syntax error at: %s\n", err);
480
fprintf(stderr, "GnuTLS error: %s\n",
481
safer_gnutls_strerror(ret));
482
gnutls_deinit(*session);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
489
if(ret != GNUTLS_E_SUCCESS){
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
safer_gnutls_strerror(ret));
492
gnutls_deinit(*session);
304
496
/* ignore client certificate if any. */
305
gnutls_certificate_server_set_request (es->session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
307
gnutls_dh_set_prime_bits (es->session, DH_BITS);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
312
void empty_log(AvahiLogLevel level, const char *txt){}
505
/* Avahi log function callback */
506
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
507
__attribute__((unused)) const char *txt){}
314
int start_mandos_communcation(char *ip, uint16_t port){
509
/* Called when a Mandos server is found */
510
static int start_mandos_communication(const char *ip, uint16_t port,
511
AvahiIfIndex if_index,
512
mandos_context *mc, int af){
316
struct sockaddr_in6 to;
317
encrypted_session es;
516
struct sockaddr_in in;
517
struct sockaddr_in6 in6;
318
519
char *buffer = NULL;
319
520
char *decrypted_buffer;
320
521
size_t buffer_length = 0;
321
522
size_t buffer_capacity = 0;
322
523
ssize_t decrypted_buffer_size;
324
const char interface[] = "eth0";
526
gnutls_session_t session;
527
int pf; /* Protocol family */
537
fprintf(stderr, "Bad address family: %d\n", af);
541
ret = init_gnutls_session(mc, &session);
327
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
547
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
330
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
551
tcp_sd = socket(pf, SOCK_STREAM, 0);
332
553
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);
557
memset(&to, 0, sizeof(to));
559
to.in6.sin6_family = (uint16_t)af;
560
ret = inet_pton(af, ip, &to.in6.sin6_addr);
562
to.in.sin_family = (sa_family_t)af;
563
ret = inet_pton(af, ip, &to.in.sin_addr);
350
566
perror("inet_pton");
354
570
fprintf(stderr, "Bad address: %s\n", ip);
357
to.sin6_port = htons(port);
358
to.sin6_scope_id = if_nametoindex(interface);
574
to.in6.sin6_port = htons(port); /* Spurious warnings from
576
-Wunreachable-code */
578
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
579
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
581
if(if_index == AVAHI_IF_UNSPEC){
582
fprintf(stderr, "An IPv6 link-local address is incomplete"
583
" without a network interface\n");
586
/* Set the network interface number as scope */
587
to.in6.sin6_scope_id = (uint32_t)if_index;
590
to.in.sin_port = htons(port); /* Spurious warnings from
592
-Wunreachable-code */
361
fprintf(stderr, "Connection to: %s\n", ip);
596
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
597
char interface[IF_NAMESIZE];
598
if(if_indextoname((unsigned int)if_index, interface) == NULL){
599
perror("if_indextoname");
601
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
602
ip, interface, port);
605
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
608
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
609
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
612
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
615
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
621
if(strcmp(addrstr, ip) != 0){
622
fprintf(stderr, "Canonical address form: %s\n", addrstr);
364
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
628
ret = connect(tcp_sd, &to.in6, sizeof(to));
630
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
366
633
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);
637
const char *out = mandos_protocol_version;
400
if (buffer_length + BUFFER_SIZE > buffer_capacity){
401
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
640
size_t out_size = strlen(out);
641
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
642
out_size - written));
648
written += (size_t)ret;
649
if(written < out_size){
652
if(out == mandos_protocol_version){
406
buffer_capacity += BUFFER_SIZE;
662
fprintf(stderr, "Establishing TLS session with %s\n", ip);
665
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
668
ret = gnutls_handshake(session);
669
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
671
if(ret != GNUTLS_E_SUCCESS){
673
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
680
/* Read OpenPGP packet that contains the wanted password */
683
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
688
buffer_capacity = adjustbuffer(&buffer, buffer_length,
690
if(buffer_capacity == 0){
691
perror("adjustbuffer");
409
ret = gnutls_record_recv
410
(es.session, buffer+buffer_length, BUFFER_SIZE);
696
sret = gnutls_record_recv(session, buffer+buffer_length,
416
703
case GNUTLS_E_INTERRUPTED:
417
704
case GNUTLS_E_AGAIN:
419
706
case GNUTLS_E_REHANDSHAKE:
420
ret = gnutls_handshake (es.session);
422
fprintf(stderr, "\n*** Handshake failed ***\n");
708
ret = gnutls_handshake(session);
709
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
711
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
429
fprintf(stderr, "Unknown error while reading data from encrypted session with mandos server\n");
718
fprintf(stderr, "Unknown error while reading data from"
719
" encrypted session with Mandos server\n");
431
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
721
gnutls_bye(session, GNUTLS_SHUT_RDWR);
435
buffer_length += ret;
725
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);
730
fprintf(stderr, "Closing TLS session\n");
733
gnutls_bye(session, GNUTLS_SHUT_RDWR);
735
if(buffer_length > 0){
736
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
739
if(decrypted_buffer_size >= 0){
741
while(written < (size_t) decrypted_buffer_size){
742
ret = (int)fwrite(decrypted_buffer + written, 1,
743
(size_t)decrypted_buffer_size - written,
745
if(ret == 0 and ferror(stdout)){
747
fprintf(stderr, "Error writing encrypted data: %s\n",
753
written += (size_t)ret;
442
755
free(decrypted_buffer);
451
fprintf(stderr, "Closing tls session\n");
763
/* 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 ();
767
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
771
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[]) {
775
static void resolve_callback(AvahiSServiceResolver *r,
776
AvahiIfIndex interface,
778
AvahiResolverEvent event,
782
const char *host_name,
783
const AvahiAddress *address,
785
AVAHI_GCC_UNUSED AvahiStringList *txt,
786
AVAHI_GCC_UNUSED AvahiLookupResultFlags
789
mandos_context *mc = userdata;
792
/* Called whenever a service has been resolved successfully or
797
case AVAHI_RESOLVER_FAILURE:
798
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
799
" of type '%s' in domain '%s': %s\n", name, type, domain,
800
avahi_strerror(avahi_server_errno(mc->server)));
803
case AVAHI_RESOLVER_FOUND:
805
char ip[AVAHI_ADDRESS_STR_MAX];
806
avahi_address_snprint(ip, sizeof(ip), address);
808
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
809
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
810
ip, (intmax_t)interface, port);
812
int ret = start_mandos_communication(ip, port, interface, mc,
813
avahi_proto_to_af(proto));
815
avahi_simple_poll_quit(mc->simple_poll);
819
avahi_s_service_resolver_free(r);
822
static void browse_callback(AvahiSServiceBrowser *b,
823
AvahiIfIndex interface,
824
AvahiProtocol protocol,
825
AvahiBrowserEvent event,
829
AVAHI_GCC_UNUSED AvahiLookupResultFlags
832
mandos_context *mc = userdata;
835
/* Called whenever a new services becomes available on the LAN or
836
is removed from the LAN */
840
case AVAHI_BROWSER_FAILURE:
842
fprintf(stderr, "(Avahi browser) %s\n",
843
avahi_strerror(avahi_server_errno(mc->server)));
844
avahi_simple_poll_quit(mc->simple_poll);
847
case AVAHI_BROWSER_NEW:
848
/* We ignore the returned Avahi resolver object. In the callback
849
function we free it. If the Avahi server is terminated before
850
the callback function is called the Avahi server will free the
853
if(!(avahi_s_service_resolver_new(mc->server, interface,
854
protocol, name, type, domain,
855
AVAHI_PROTO_INET6, 0,
856
resolve_callback, mc)))
857
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
858
name, avahi_strerror(avahi_server_errno(mc->server)));
861
case AVAHI_BROWSER_REMOVE:
864
case AVAHI_BROWSER_ALL_FOR_NOW:
865
case AVAHI_BROWSER_CACHE_EXHAUSTED:
867
fprintf(stderr, "No Mandos server found, still searching...\n");
873
int main(int argc, char *argv[]){
874
AvahiSServiceBrowser *sb = NULL;
879
int exitcode = EXIT_SUCCESS;
880
const char *interface = "eth0";
881
struct ifreq network;
885
char *connect_to = NULL;
886
char tempdir[] = "/tmp/mandosXXXXXX";
887
bool tempdir_created = false;
888
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
889
const char *seckey = PATHDIR "/" SECKEY;
890
const char *pubkey = PATHDIR "/" PUBKEY;
892
mandos_context mc = { .simple_poll = NULL, .server = NULL,
893
.dh_bits = 1024, .priority = "SECURE256"
894
":!CTYPE-X.509:+CTYPE-OPENPGP" };
895
bool gnutls_initialized = false;
896
bool gpgme_initialized = false;
900
struct argp_option options[] = {
901
{ .name = "debug", .key = 128,
902
.doc = "Debug mode", .group = 3 },
903
{ .name = "connect", .key = 'c',
904
.arg = "ADDRESS:PORT",
905
.doc = "Connect directly to a specific Mandos server",
907
{ .name = "interface", .key = 'i',
909
.doc = "Network interface that will be used to search for"
912
{ .name = "seckey", .key = 's',
914
.doc = "OpenPGP secret key file base name",
916
{ .name = "pubkey", .key = 'p',
918
.doc = "OpenPGP public key file base name",
920
{ .name = "dh-bits", .key = 129,
922
.doc = "Bit length of the prime number used in the"
923
" Diffie-Hellman key exchange",
925
{ .name = "priority", .key = 130,
927
.doc = "GnuTLS priority string for the TLS handshake",
929
{ .name = "delay", .key = 131,
931
.doc = "Maximum delay to wait for interface startup",
936
error_t parse_opt(int key, char *arg,
937
struct argp_state *state){
939
case 128: /* --debug */
942
case 'c': /* --connect */
945
case 'i': /* --interface */
948
case 's': /* --seckey */
951
case 'p': /* --pubkey */
954
case 129: /* --dh-bits */
955
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
956
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
957
or arg[numchars] != '\0'){
958
fprintf(stderr, "Bad number of DH bits\n");
961
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
963
case 130: /* --priority */
966
case 131: /* --delay */
967
ret = sscanf(arg, "%lf%n", &delay, &numchars);
968
if(ret < 1 or arg[numchars] != '\0'){
969
fprintf(stderr, "Bad delay\n");
978
return ARGP_ERR_UNKNOWN;
983
struct argp argp = { .options = options, .parser = parse_opt,
985
.doc = "Mandos client -- Get and decrypt"
986
" passwords from a Mandos server" };
987
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
988
if(ret == ARGP_ERR_UNKNOWN){
989
fprintf(stderr, "Unknown error while parsing arguments\n");
990
exitcode = EXIT_FAILURE;
995
/* If the interface is down, bring it up */
996
if(interface[0] != '\0'){
998
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
999
messages to mess up the prompt */
1000
ret = klogctl(8, NULL, 5);
1001
bool restore_loglevel = true;
1003
restore_loglevel = false;
1008
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1011
exitcode = EXIT_FAILURE;
1013
if(restore_loglevel){
1014
ret = klogctl(7, NULL, 0);
1022
strcpy(network.ifr_name, interface);
1023
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1025
perror("ioctl SIOCGIFFLAGS");
1027
if(restore_loglevel){
1028
ret = klogctl(7, NULL, 0);
1034
exitcode = EXIT_FAILURE;
1037
if((network.ifr_flags & IFF_UP) == 0){
1038
network.ifr_flags |= IFF_UP;
1039
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1041
perror("ioctl SIOCSIFFLAGS");
1042
exitcode = EXIT_FAILURE;
1044
if(restore_loglevel){
1045
ret = klogctl(7, NULL, 0);
1054
/* sleep checking until interface is running */
1055
for(int i=0; i < delay * 4; i++){
1056
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1058
perror("ioctl SIOCGIFFLAGS");
1059
} else if(network.ifr_flags & IFF_RUNNING){
1062
struct timespec sleeptime = { .tv_nsec = 250000000 };
1063
ret = nanosleep(&sleeptime, NULL);
1064
if(ret == -1 and errno != EINTR){
1065
perror("nanosleep");
1068
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1073
if(restore_loglevel){
1074
/* Restores kernel loglevel to default */
1075
ret = klogctl(7, NULL, 0);
1097
ret = init_gnutls_global(&mc, pubkey, seckey);
1099
fprintf(stderr, "init_gnutls_global failed\n");
1100
exitcode = EXIT_FAILURE;
1103
gnutls_initialized = true;
1106
if(mkdtemp(tempdir) == NULL){
1110
tempdir_created = true;
1112
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1113
fprintf(stderr, "init_gpgme failed\n");
1114
exitcode = EXIT_FAILURE;
1117
gpgme_initialized = true;
1120
if(interface[0] != '\0'){
1121
if_index = (AvahiIfIndex) if_nametoindex(interface);
1123
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1124
exitcode = EXIT_FAILURE;
1129
if(connect_to != NULL){
1130
/* Connect directly, do not use Zeroconf */
1131
/* (Mainly meant for debugging) */
1132
char *address = strrchr(connect_to, ':');
1133
if(address == NULL){
1134
fprintf(stderr, "No colon in address\n");
1135
exitcode = EXIT_FAILURE;
1139
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1140
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1141
or address[numchars+1] != '\0'){
1142
fprintf(stderr, "Bad port number\n");
1143
exitcode = EXIT_FAILURE;
1146
port = (uint16_t)tmpmax;
1148
address = connect_to;
1149
/* Colon in address indicates IPv6 */
1151
if(strchr(address, ':') != NULL){
1156
ret = start_mandos_communication(address, port, if_index, &mc,
1159
exitcode = EXIT_FAILURE;
1161
exitcode = EXIT_SUCCESS;
1167
avahi_set_log_function(empty_log);
1170
/* Initialize the pseudo-RNG for Avahi */
1171
srand((unsigned int) time(NULL));
1173
/* Allocate main Avahi loop object */
1174
mc.simple_poll = avahi_simple_poll_new();
1175
if(mc.simple_poll == NULL){
1176
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1177
exitcode = EXIT_FAILURE;
553
1182
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 */
1183
/* Do not publish any local Zeroconf records */
600
1184
avahi_server_config_init(&config);
601
1185
config.publish_hinfo = 0;
602
1186
config.publish_addresses = 0;
603
1187
config.publish_workstation = 0;
604
1188
config.publish_domain = 0;
606
1190
/* Allocate a new server */
607
server = avahi_server_new(avahi_simple_poll_get(simple_poll), &config, NULL, NULL, &error);
609
/* Free the configuration data */
1191
mc.server = avahi_server_new(avahi_simple_poll_get
1192
(mc.simple_poll), &config, NULL,
1195
/* Free the Avahi configuration data */
610
1196
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);
1199
/* Check if creating the Avahi server object succeeded */
1200
if(mc.server == NULL){
1201
fprintf(stderr, "Failed to create Avahi server: %s\n",
1202
avahi_strerror(error));
1203
exitcode = EXIT_FAILURE;
1207
/* Create the Avahi service browser */
1208
sb = avahi_s_service_browser_new(mc.server, if_index,
1209
AVAHI_PROTO_INET6, "_mandos._tcp",
1210
NULL, 0, browse_callback, &mc);
1212
fprintf(stderr, "Failed to create service browser: %s\n",
1213
avahi_strerror(avahi_server_errno(mc.server)));
1214
exitcode = EXIT_FAILURE;
1218
/* Run the main loop */
1221
fprintf(stderr, "Starting Avahi loop search\n");
1224
avahi_simple_poll_loop(mc.simple_poll);
1229
fprintf(stderr, "%s exiting\n", argv[0]);
1232
/* Cleanup things */
1234
avahi_s_service_browser_free(sb);
1236
if(mc.server != NULL)
1237
avahi_server_free(mc.server);
1239
if(mc.simple_poll != NULL)
1240
avahi_simple_poll_free(mc.simple_poll);
1242
if(gnutls_initialized){
1243
gnutls_certificate_free_credentials(mc.cred);
1244
gnutls_global_deinit();
1245
gnutls_dh_params_deinit(mc.dh_params);
1248
if(gpgme_initialized){
1249
gpgme_release(mc.ctx);
1252
/* Removes the temp directory used by GPGME */
1253
if(tempdir_created){
1255
struct dirent *direntry;
1256
d = opendir(tempdir);
1258
if(errno != ENOENT){
1263
direntry = readdir(d);
1264
if(direntry == NULL){
1267
/* Skip "." and ".." */
1268
if(direntry->d_name[0] == '.'
1269
and (direntry->d_name[1] == '\0'
1270
or (direntry->d_name[1] == '.'
1271
and direntry->d_name[2] == '\0'))){
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", tempdir,
1281
ret = remove(fullname);
1283
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1290
ret = rmdir(tempdir);
1291
if(ret == -1 and errno != ENOENT){