334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
194
/* Delete the GPGME FILE pointer cryptotext data buffer */
195
gpgme_data_release(dh_crypto);
337
197
/* Seek back to the beginning of the GPGME plaintext data buffer */
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
339
perror("gpgme_data_seek");
340
plaintext_length = -1;
198
gpgme_data_seek(dh_plain, 0, SEEK_SET);
346
plaintext_capacity = incbuffer(plaintext,
347
(size_t)plaintext_length,
349
if(plaintext_capacity == 0){
351
plaintext_length = -1;
202
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
203
*new_packet = realloc(*new_packet,
204
(unsigned int)new_packet_capacity
206
if (*new_packet == NULL){
210
new_packet_capacity += BUFFER_SIZE;
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
213
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
357
215
/* Print the data, if any */
363
220
perror("gpgme_data_read");
364
plaintext_length = -1;
367
plaintext_length += ret;
371
fprintf(stderr, "Decrypted password is: ");
372
for(ssize_t i = 0; i < plaintext_length; i++){
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
375
fprintf(stderr, "\n");
380
/* Delete the GPGME cryptotext data buffer */
381
gpgme_data_release(dh_crypto);
223
new_packet_length += ret;
226
/* FIXME: check characters before printing to screen so to not print
227
terminal control characters */
229
/* fprintf(stderr, "decrypted password is: "); */
230
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
231
/* fprintf(stderr, "\n"); */
383
234
/* Delete the GPGME plaintext data buffer */
384
235
gpgme_data_release(dh_plain);
385
return plaintext_length;
236
return new_packet_length;
388
static const char * safer_gnutls_strerror(int value){
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
239
static const char * safer_gnutls_strerror (int value) {
240
const char *ret = gnutls_strerror (value);
392
242
ret = "(unknown)";
396
/* GnuTLS log function callback */
397
static void debuggnutls(__attribute__((unused)) int level,
399
fprintf(stderr, "GnuTLS: %s", string);
246
void debuggnutls(__attribute__((unused)) int level,
248
fprintf(stderr, "%s", string);
402
static int init_gnutls_global(const char *pubkeyfilename,
403
const char *seckeyfilename){
251
int initgnutls(encrypted_session *es){
407
256
fprintf(stderr, "Initializing GnuTLS\n");
410
ret = gnutls_global_init();
411
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
259
if ((ret = gnutls_global_init ())
260
!= GNUTLS_E_SUCCESS) {
261
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
418
/* "Use a log level over 10 to enable all debugging options."
421
266
gnutls_global_set_log_level(11);
422
267
gnutls_global_set_log_function(debuggnutls);
425
/* OpenPGP credentials */
426
gnutls_certificate_allocate_credentials(&mc.cred);
427
if(ret != GNUTLS_E_SUCCESS){
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
432
safer_gnutls_strerror(ret));
433
gnutls_global_deinit();
270
/* openpgp credentials */
271
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
272
!= GNUTLS_E_SUCCESS) {
273
fprintf (stderr, "memory error: %s\n",
274
safer_gnutls_strerror(ret));
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
279
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
280
" and keyfile %s as GnuTLS credentials\n", CERTFILE,
443
284
ret = gnutls_certificate_set_openpgp_key_file
444
(mc.cred, pubkeyfilename, seckeyfilename,
445
GNUTLS_OPENPGP_FMT_BASE64);
446
if(ret != GNUTLS_E_SUCCESS){
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
455
/* GnuTLS server initialization */
456
ret = gnutls_dh_params_init(&mc.dh_params);
457
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
463
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
475
gnutls_certificate_free_credentials(mc.cred);
476
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
481
static int init_gnutls_session(gnutls_session_t *session){
483
/* GnuTLS session creation */
485
ret = gnutls_init(session, GNUTLS_SERVER);
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
if(ret != GNUTLS_E_SUCCESS){
285
(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
286
if (ret != GNUTLS_E_SUCCESS) {
288
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
290
ret, CERTFILE, KEYFILE);
291
fprintf(stdout, "The Error is: %s\n",
292
safer_gnutls_strerror(ret));
296
//GnuTLS server initialization
297
if ((ret = gnutls_dh_params_init (&es->dh_params))
298
!= GNUTLS_E_SUCCESS) {
299
fprintf (stderr, "Error in dh parameter initialization: %s\n",
300
safer_gnutls_strerror(ret));
304
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
305
!= GNUTLS_E_SUCCESS) {
306
fprintf (stderr, "Error in prime generation: %s\n",
307
safer_gnutls_strerror(ret));
311
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
313
// GnuTLS session creation
314
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
315
!= GNUTLS_E_SUCCESS){
491
316
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
317
safer_gnutls_strerror(ret));
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
500
gnutls_deinit(*session);
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
504
if(ret != GNUTLS_E_SUCCESS){
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
508
gnutls_deinit(*session);
320
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
321
!= GNUTLS_E_SUCCESS) {
322
fprintf(stderr, "Syntax error at: %s\n", err);
323
fprintf(stderr, "GnuTLS error: %s\n",
324
safer_gnutls_strerror(ret));
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
517
gnutls_deinit(*session);
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
521
if(ret != GNUTLS_E_SUCCESS){
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
328
if ((ret = gnutls_credentials_set
329
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
330
!= GNUTLS_E_SUCCESS) {
331
fprintf(stderr, "Error setting a credentials set: %s\n",
523
332
safer_gnutls_strerror(ret));
524
gnutls_deinit(*session);
528
336
/* ignore client certificate if any. */
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
337
gnutls_certificate_server_set_request (es->session,
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
340
gnutls_dh_set_prime_bits (es->session, DH_BITS);
536
/* Avahi log function callback */
537
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
538
__attribute__((unused)) const char *txt){}
345
void empty_log(__attribute__((unused)) AvahiLogLevel level,
346
__attribute__((unused)) const char *txt){}
540
/* Called when a Mandos server is found */
541
static int start_mandos_communication(const char *ip, uint16_t port,
542
AvahiIfIndex if_index,
544
int ret, tcp_sd = -1;
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
348
int start_mandos_communication(char *ip, uint16_t port,
349
unsigned int if_index){
351
struct sockaddr_in6 to;
352
encrypted_session es;
550
353
char *buffer = NULL;
551
char *decrypted_buffer = NULL;
354
char *decrypted_buffer;
552
355
size_t buffer_length = 0;
553
356
size_t buffer_capacity = 0;
556
gnutls_session_t session;
557
int pf; /* Protocol family */
574
fprintf(stderr, "Bad address family: %d\n", af);
579
ret = init_gnutls_session(&session);
357
ssize_t decrypted_buffer_size;
359
char interface[IF_NAMESIZE];
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
362
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
365
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
592
367
perror("socket");
602
memset(&to, 0, sizeof(to));
604
to.in6.sin6_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
607
to.in.sin_family = (sa_family_t)af;
608
ret = inet_pton(af, ip, &to.in.sin_addr);
371
if(if_indextoname(if_index, interface) == NULL){
373
perror("if_indextoname");
379
fprintf(stderr, "Binding to interface %s\n", interface);
382
ret = setsockopt(tcp_sd, SOL_SOCKET, SO_BINDTODEVICE, interface, 5);
384
perror("setsockopt bindtodevice");
388
memset(&to,0,sizeof(to));
389
to.sin6_family = AF_INET6;
390
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
612
392
perror("inet_pton");
618
396
fprintf(stderr, "Bad address: %s\n", ip);
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
625
-Wunreachable-code */
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
630
if(if_index == AVAHI_IF_UNSPEC){
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
636
/* Set the network interface number as scope */
637
to.in6.sin6_scope_id = (uint32_t)if_index;
640
to.in.sin_port = htons(port); /* Spurious warnings from
642
-Wunreachable-code */
399
/* Spurious warnings for the next line, see for instance
400
<http://bugs.debian.org/488884> */
401
to.sin6_port = htons(port);
403
to.sin6_scope_id = (uint32_t)if_index;
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
char interface[IF_NAMESIZE];
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
667
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
670
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
676
if(strcmp(addrstr, ip) != 0){
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
706
const char *out = mandos_protocol_version;
709
size_t out_size = strlen(out);
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
711
out_size - written));
718
written += (size_t)ret;
719
if(written < out_size){
722
if(out == mandos_protocol_version){
406
fprintf(stderr, "Connection to: %s\n", ip);
409
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
415
ret = initgnutls (&es);
421
gnutls_transport_set_ptr (es.session,
422
(gnutls_transport_ptr_t) tcp_sd);
737
425
fprintf(stderr, "Establishing TLS session with %s\n", ip);
745
/* Spurious warnings from -Wint-to-pointer-cast */
746
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
754
ret = gnutls_handshake(session);
759
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
761
if(ret != GNUTLS_E_SUCCESS){
763
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
770
/* Read OpenPGP packet that contains the wanted password */
428
ret = gnutls_handshake (es.session);
430
if (ret != GNUTLS_E_SUCCESS){
431
fprintf(stderr, "\n*** Handshake failed ***\n");
437
//Retrieve OpenPGP packet that contains the wanted password
773
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
440
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
784
buffer_capacity = incbuffer(&buffer, buffer_length,
786
if(buffer_capacity == 0){
798
sret = gnutls_record_recv(session, buffer+buffer_length,
445
if (buffer_length + BUFFER_SIZE > buffer_capacity){
446
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
451
buffer_capacity += BUFFER_SIZE;
454
ret = gnutls_record_recv
455
(es.session, buffer+buffer_length, BUFFER_SIZE);
805
461
case GNUTLS_E_INTERRUPTED:
806
462
case GNUTLS_E_AGAIN:
808
464
case GNUTLS_E_REHANDSHAKE:
810
ret = gnutls_handshake(session);
816
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
818
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
465
ret = gnutls_handshake (es.session);
467
fprintf(stderr, "\n*** Handshake failed ***\n");
825
474
fprintf(stderr, "Unknown error while reading data from"
826
" encrypted session with Mandos server\n");
827
gnutls_bye(session, GNUTLS_SHUT_RDWR);
475
" encrypted session with mandos server\n");
477
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
832
buffer_length += (size_t) sret;
837
fprintf(stderr, "Closing TLS session\n");
846
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
851
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
853
if(buffer_length > 0){
854
ssize_t decrypted_buffer_size;
481
buffer_length += (size_t) ret;
485
if (buffer_length > 0){
855
486
decrypted_buffer_size = pgp_packet_decrypt(buffer,
858
if(decrypted_buffer_size >= 0){
861
while(written < (size_t) decrypted_buffer_size){
867
ret = (int)fwrite(decrypted_buffer + written, 1,
868
(size_t)decrypted_buffer_size - written,
490
if (decrypted_buffer_size >= 0){
491
while(decrypted_buffer_size > 0){
492
ret = fwrite (decrypted_buffer, 1, (size_t)decrypted_buffer_size,
870
494
if(ret == 0 and ferror(stdout)){
873
496
fprintf(stderr, "Error writing encrypted data: %s\n",
874
497
strerror(errno));
879
written += (size_t)ret;
885
/* Shutdown procedure */
890
free(decrypted_buffer);
893
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
901
gnutls_deinit(session);
502
decrypted_buffer += ret;
503
decrypted_buffer_size -= ret;
505
free(decrypted_buffer);
514
fprintf(stderr, "Closing TLS session\n");
518
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
521
gnutls_deinit (es.session);
522
gnutls_certificate_free_credentials (es.cred);
523
gnutls_global_deinit ();
911
static void resolve_callback(AvahiSServiceResolver *r,
912
AvahiIfIndex interface,
914
AvahiResolverEvent event,
918
const char *host_name,
919
const AvahiAddress *address,
921
AVAHI_GCC_UNUSED AvahiStringList *txt,
922
AVAHI_GCC_UNUSED AvahiLookupResultFlags
924
AVAHI_GCC_UNUSED void* userdata){
527
static AvahiSimplePoll *simple_poll = NULL;
528
static AvahiServer *server = NULL;
530
static void resolve_callback(
531
AvahiSServiceResolver *r,
532
AVAHI_GCC_UNUSED AvahiIfIndex interface,
533
AVAHI_GCC_UNUSED AvahiProtocol protocol,
534
AvahiResolverEvent event,
538
const char *host_name,
539
const AvahiAddress *address,
541
AVAHI_GCC_UNUSED AvahiStringList *txt,
542
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
543
AVAHI_GCC_UNUSED void* userdata) {
927
547
/* Called whenever a service has been resolved successfully or
936
552
case AVAHI_RESOLVER_FAILURE:
937
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
938
" of type '%s' in domain '%s': %s\n", name, type, domain,
939
avahi_strerror(avahi_server_errno(mc.server)));
553
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
554
" type '%s' in domain '%s': %s\n", name, type, domain,
555
avahi_strerror(avahi_server_errno(server)));
942
558
case AVAHI_RESOLVER_FOUND:
944
560
char ip[AVAHI_ADDRESS_STR_MAX];
945
561
avahi_address_snprint(ip, sizeof(ip), address);
947
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
948
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
949
ip, (intmax_t)interface, port);
563
fprintf(stderr, "Mandos server found on %s (%s) on port %d\n",
564
host_name, ip, port);
951
int ret = start_mandos_communication(ip, port, interface,
952
avahi_proto_to_af(proto));
954
avahi_simple_poll_quit(mc.simple_poll);
566
int ret = start_mandos_communication(ip, port,
958
576
avahi_s_service_resolver_free(r);
961
static void browse_callback(AvahiSServiceBrowser *b,
962
AvahiIfIndex interface,
963
AvahiProtocol protocol,
964
AvahiBrowserEvent event,
968
AVAHI_GCC_UNUSED AvahiLookupResultFlags
970
AVAHI_GCC_UNUSED void* userdata){
973
/* Called whenever a new services becomes available on the LAN or
974
is removed from the LAN */
982
case AVAHI_BROWSER_FAILURE:
984
fprintf(stderr, "(Avahi browser) %s\n",
985
avahi_strerror(avahi_server_errno(mc.server)));
986
avahi_simple_poll_quit(mc.simple_poll);
989
case AVAHI_BROWSER_NEW:
990
/* We ignore the returned Avahi resolver object. In the callback
991
function we free it. If the Avahi server is terminated before
992
the callback function is called the Avahi server will free the
995
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
996
name, type, domain, protocol, 0,
997
resolve_callback, NULL) == NULL)
998
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
999
name, avahi_strerror(avahi_server_errno(mc.server)));
1002
case AVAHI_BROWSER_REMOVE:
1005
case AVAHI_BROWSER_ALL_FOR_NOW:
1006
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1008
fprintf(stderr, "No Mandos server found, still searching...\n");
1014
/* stop main loop after sigterm has been called */
1015
static void handle_sigterm(int sig){
1020
signal_received = sig;
1021
int old_errno = errno;
1022
if(mc.simple_poll != NULL){
1023
avahi_simple_poll_quit(mc.simple_poll);
1029
* This function determines if a directory entry in /sys/class/net
1030
* corresponds to an acceptable network device.
1031
* (This function is passed to scandir(3) as a filter function.)
1033
int good_interface(const struct dirent *if_entry){
1035
char *flagname = NULL;
1036
if(if_entry->d_name[0] == '.'){
1039
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1045
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1052
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1053
/* read line from flags_fd */
1054
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1055
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1056
flagstring[(size_t)to_read] = '\0';
1057
if(flagstring == NULL){
1063
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1080
tmpmax = strtoimax(flagstring, &tmp, 0);
1081
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1082
and not (isspace(*tmp)))
1083
or tmpmax != (ifreq_flags)tmpmax){
1085
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1086
flagstring, if_entry->d_name);
1092
ifreq_flags flags = (ifreq_flags)tmpmax;
1093
/* Reject the loopback device */
1094
if(flags & IFF_LOOPBACK){
1096
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1101
/* Accept point-to-point devices only if connect_to is specified */
1102
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1104
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1109
/* Otherwise, reject non-broadcast-capable devices */
1110
if(not (flags & IFF_BROADCAST)){
1112
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1117
/* Reject non-ARP interfaces (including dummy interfaces) */
1118
if(flags & IFF_NOARP){
1120
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1125
/* Accept this device */
1127
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1133
int notdotentries(const struct dirent *direntry){
1134
/* Skip "." and ".." */
1135
if(direntry->d_name[0] == '.'
1136
and (direntry->d_name[1] == '\0'
1137
or (direntry->d_name[1] == '.'
1138
and direntry->d_name[2] == '\0'))){
1144
int main(int argc, char *argv[]){
1145
AvahiSServiceBrowser *sb = NULL;
1150
int exitcode = EXIT_SUCCESS;
1151
const char *interface = "";
1152
struct ifreq network;
1154
bool take_down_interface = false;
1157
char tempdir[] = "/tmp/mandosXXXXXX";
1158
bool tempdir_created = false;
1159
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1160
const char *seckey = PATHDIR "/" SECKEY;
1161
const char *pubkey = PATHDIR "/" PUBKEY;
1163
bool gnutls_initialized = false;
1164
bool gpgme_initialized = false;
1167
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1168
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1173
/* Lower any group privileges we might have, just to be safe */
1180
/* Lower user privileges (temporarily) */
1192
struct argp_option options[] = {
1193
{ .name = "debug", .key = 128,
1194
.doc = "Debug mode", .group = 3 },
1195
{ .name = "connect", .key = 'c',
1196
.arg = "ADDRESS:PORT",
1197
.doc = "Connect directly to a specific Mandos server",
1199
{ .name = "interface", .key = 'i',
1201
.doc = "Network interface that will be used to search for"
1204
{ .name = "seckey", .key = 's',
1206
.doc = "OpenPGP secret key file base name",
1208
{ .name = "pubkey", .key = 'p',
1210
.doc = "OpenPGP public key file base name",
1212
{ .name = "dh-bits", .key = 129,
1214
.doc = "Bit length of the prime number used in the"
1215
" Diffie-Hellman key exchange",
1217
{ .name = "priority", .key = 130,
1219
.doc = "GnuTLS priority string for the TLS handshake",
1221
{ .name = "delay", .key = 131,
1223
.doc = "Maximum delay to wait for interface startup",
1226
* These reproduce what we would get without ARGP_NO_HELP
1228
{ .name = "help", .key = '?',
1229
.doc = "Give this help list", .group = -1 },
1230
{ .name = "usage", .key = -3,
1231
.doc = "Give a short usage message", .group = -1 },
1232
{ .name = "version", .key = 'V',
1233
.doc = "Print program version", .group = -1 },
1237
error_t parse_opt(int key, char *arg,
1238
struct argp_state *state){
1241
case 128: /* --debug */
1244
case 'c': /* --connect */
1247
case 'i': /* --interface */
1250
case 's': /* --seckey */
1253
case 'p': /* --pubkey */
1256
case 129: /* --dh-bits */
1258
tmpmax = strtoimax(arg, &tmp, 10);
1259
if(errno != 0 or tmp == arg or *tmp != '\0'
1260
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1261
argp_error(state, "Bad number of DH bits");
1263
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1265
case 130: /* --priority */
1268
case 131: /* --delay */
1270
delay = strtof(arg, &tmp);
1271
if(errno != 0 or tmp == arg or *tmp != '\0'){
1272
argp_error(state, "Bad delay");
1276
* These reproduce what we would get without ARGP_NO_HELP
1278
case '?': /* --help */
1279
argp_state_help(state, state->out_stream,
1280
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1281
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1282
case -3: /* --usage */
1283
argp_state_help(state, state->out_stream,
1284
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1285
case 'V': /* --version */
1286
fprintf(state->out_stream, "%s\n", argp_program_version);
1287
exit(argp_err_exit_status);
1290
return ARGP_ERR_UNKNOWN;
1295
struct argp argp = { .options = options, .parser = parse_opt,
1297
.doc = "Mandos client -- Get and decrypt"
1298
" passwords from a Mandos server" };
1299
ret = argp_parse(&argp, argc, argv,
1300
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
579
static void browse_callback(
580
AvahiSServiceBrowser *b,
581
AvahiIfIndex interface,
582
AvahiProtocol protocol,
583
AvahiBrowserEvent event,
587
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
590
AvahiServer *s = userdata;
593
/* Called whenever a new services becomes available on the LAN or
594
is removed from the LAN */
1307
perror("argp_parse");
1308
exitcode = EX_OSERR;
1311
exitcode = EX_USAGE;
1317
avahi_set_log_function(empty_log);
1320
if(interface[0] == '\0'){
1321
struct dirent **direntries;
1322
ret = scandir(sys_class_net, &direntries, good_interface,
1325
/* Pick the first good interface */
1326
interface = strdup(direntries[0]->d_name);
1328
fprintf(stderr, "Using interface \"%s\"\n", interface);
1330
if(interface == NULL){
1333
exitcode = EXIT_FAILURE;
1339
fprintf(stderr, "Could not find a network interface\n");
1340
exitcode = EXIT_FAILURE;
1345
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1346
from the signal handler */
1347
/* Initialize the pseudo-RNG for Avahi */
1348
srand((unsigned int) time(NULL));
1349
mc.simple_poll = avahi_simple_poll_new();
1350
if(mc.simple_poll == NULL){
1351
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1352
exitcode = EX_UNAVAILABLE;
1356
sigemptyset(&sigterm_action.sa_mask);
1357
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1359
perror("sigaddset");
1360
exitcode = EX_OSERR;
1363
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1365
perror("sigaddset");
1366
exitcode = EX_OSERR;
1369
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1371
perror("sigaddset");
1372
exitcode = EX_OSERR;
1375
/* Need to check if the handler is SIG_IGN before handling:
1376
| [[info:libc:Initial Signal Actions]] |
1377
| [[info:libc:Basic Signal Handling]] |
1379
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1381
perror("sigaction");
1384
if(old_sigterm_action.sa_handler != SIG_IGN){
1385
ret = sigaction(SIGINT, &sigterm_action, NULL);
1387
perror("sigaction");
1388
exitcode = EX_OSERR;
1392
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1394
perror("sigaction");
1397
if(old_sigterm_action.sa_handler != SIG_IGN){
1398
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1400
perror("sigaction");
1401
exitcode = EX_OSERR;
1405
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1407
perror("sigaction");
1410
if(old_sigterm_action.sa_handler != SIG_IGN){
1411
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1413
perror("sigaction");
1414
exitcode = EX_OSERR;
1419
/* If the interface is down, bring it up */
1420
if(strcmp(interface, "none") != 0){
1421
if_index = (AvahiIfIndex) if_nametoindex(interface);
1423
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1424
exitcode = EX_UNAVAILABLE;
1432
/* Re-raise priviliges */
1440
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1441
messages about the network interface to mess up the prompt */
1442
ret = klogctl(8, NULL, 5);
1443
bool restore_loglevel = true;
1445
restore_loglevel = false;
1448
#endif /* __linux__ */
1450
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1453
exitcode = EX_OSERR;
1455
if(restore_loglevel){
1456
ret = klogctl(7, NULL, 0);
1461
#endif /* __linux__ */
1462
/* Lower privileges */
1470
strcpy(network.ifr_name, interface);
1471
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1473
perror("ioctl SIOCGIFFLAGS");
1475
if(restore_loglevel){
1476
ret = klogctl(7, NULL, 0);
1481
#endif /* __linux__ */
1482
exitcode = EX_OSERR;
1483
/* Lower privileges */
1491
if((network.ifr_flags & IFF_UP) == 0){
1492
network.ifr_flags |= IFF_UP;
1493
take_down_interface = true;
1494
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1496
take_down_interface = false;
1497
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1498
exitcode = EX_OSERR;
1500
if(restore_loglevel){
1501
ret = klogctl(7, NULL, 0);
1506
#endif /* __linux__ */
1507
/* Lower privileges */
1516
/* sleep checking until interface is running */
1517
for(int i=0; i < delay * 4; i++){
1518
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1520
perror("ioctl SIOCGIFFLAGS");
1521
} else if(network.ifr_flags & IFF_RUNNING){
1524
struct timespec sleeptime = { .tv_nsec = 250000000 };
1525
ret = nanosleep(&sleeptime, NULL);
1526
if(ret == -1 and errno != EINTR){
1527
perror("nanosleep");
1530
if(not take_down_interface){
1531
/* We won't need the socket anymore */
1532
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1538
if(restore_loglevel){
1539
/* Restores kernel loglevel to default */
1540
ret = klogctl(7, NULL, 0);
1545
#endif /* __linux__ */
1546
/* Lower privileges */
1548
if(take_down_interface){
1549
/* Lower privileges */
1555
/* Lower privileges permanently */
1567
ret = init_gnutls_global(pubkey, seckey);
1569
fprintf(stderr, "init_gnutls_global failed\n");
1570
exitcode = EX_UNAVAILABLE;
1573
gnutls_initialized = true;
1580
if(mkdtemp(tempdir) == NULL){
1584
tempdir_created = true;
1590
if(not init_gpgme(pubkey, seckey, tempdir)){
1591
fprintf(stderr, "init_gpgme failed\n");
1592
exitcode = EX_UNAVAILABLE;
1595
gpgme_initialized = true;
1602
if(connect_to != NULL){
1603
/* Connect directly, do not use Zeroconf */
1604
/* (Mainly meant for debugging) */
1605
char *address = strrchr(connect_to, ':');
1606
if(address == NULL){
1607
fprintf(stderr, "No colon in address\n");
1608
exitcode = EX_USAGE;
1618
tmpmax = strtoimax(address+1, &tmp, 10);
1619
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1620
or tmpmax != (uint16_t)tmpmax){
1621
fprintf(stderr, "Bad port number\n");
1622
exitcode = EX_USAGE;
1630
port = (uint16_t)tmpmax;
1632
address = connect_to;
1633
/* Colon in address indicates IPv6 */
1635
if(strchr(address, ':') != NULL){
1645
while(not quit_now){
1646
ret = start_mandos_communication(address, port, if_index, af);
1647
if(quit_now or ret == 0){
1654
exitcode = EXIT_SUCCESS;
598
case AVAHI_BROWSER_FAILURE:
600
fprintf(stderr, "(Browser) %s\n",
601
avahi_strerror(avahi_server_errno(server)));
602
avahi_simple_poll_quit(simple_poll);
605
case AVAHI_BROWSER_NEW:
606
/* We ignore the returned resolver object. In the callback
607
function we free it. If the server is terminated before
608
the callback function is called the server will free
609
the resolver for us. */
611
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
613
AVAHI_PROTO_INET6, 0,
614
resolve_callback, s)))
615
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
616
avahi_strerror(avahi_server_errno(s)));
619
case AVAHI_BROWSER_REMOVE:
622
case AVAHI_BROWSER_ALL_FOR_NOW:
623
case AVAHI_BROWSER_CACHE_EXHAUSTED:
628
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
1665
629
AvahiServerConfig config;
1666
/* Do not publish any local Zeroconf records */
630
AvahiSServiceBrowser *sb = NULL;
633
int returncode = EXIT_SUCCESS;
634
const char *interface = "eth0";
637
static struct option long_options[] = {
638
{"debug", no_argument, (int *)&debug, 1},
639
{"interface", required_argument, 0, 'i'},
642
int option_index = 0;
643
ret = getopt_long (argc, argv, "i:", long_options,
662
avahi_set_log_function(empty_log);
665
/* Initialize the psuedo-RNG */
666
srand((unsigned int) time(NULL));
668
/* Allocate main loop object */
669
if (!(simple_poll = avahi_simple_poll_new())) {
670
fprintf(stderr, "Failed to create simple poll object.\n");
675
/* Do not publish any local records */
1667
676
avahi_server_config_init(&config);
1668
677
config.publish_hinfo = 0;
1669
678
config.publish_addresses = 0;
1670
679
config.publish_workstation = 0;
1671
680
config.publish_domain = 0;
1673
682
/* Allocate a new server */
1674
mc.server = avahi_server_new(avahi_simple_poll_get
1675
(mc.simple_poll), &config, NULL,
1678
/* Free the Avahi configuration data */
683
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
684
&config, NULL, NULL, &error);
686
/* Free the configuration data */
1679
687
avahi_server_config_free(&config);
1682
/* Check if creating the Avahi server object succeeded */
1683
if(mc.server == NULL){
1684
fprintf(stderr, "Failed to create Avahi server: %s\n",
1685
avahi_strerror(error));
1686
exitcode = EX_UNAVAILABLE;
1694
/* Create the Avahi service browser */
1695
sb = avahi_s_service_browser_new(mc.server, if_index,
1696
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1697
NULL, 0, browse_callback, NULL);
1699
fprintf(stderr, "Failed to create service browser: %s\n",
1700
avahi_strerror(avahi_server_errno(mc.server)));
1701
exitcode = EX_UNAVAILABLE;
1709
/* Run the main loop */
1712
fprintf(stderr, "Starting Avahi loop search\n");
1715
avahi_simple_poll_loop(mc.simple_poll);
1720
fprintf(stderr, "%s exiting\n", argv[0]);
1723
/* Cleanup things */
1725
avahi_s_service_browser_free(sb);
1727
if(mc.server != NULL)
1728
avahi_server_free(mc.server);
1730
if(mc.simple_poll != NULL)
1731
avahi_simple_poll_free(mc.simple_poll);
1733
if(gnutls_initialized){
1734
gnutls_certificate_free_credentials(mc.cred);
1735
gnutls_global_deinit();
1736
gnutls_dh_params_deinit(mc.dh_params);
1739
if(gpgme_initialized){
1740
gpgme_release(mc.ctx);
1743
/* Take down the network interface */
1744
if(take_down_interface){
1745
/* Re-raise priviliges */
1752
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1754
perror("ioctl SIOCGIFFLAGS");
1755
} else if(network.ifr_flags & IFF_UP) {
1756
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1757
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1759
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1762
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1766
/* Lower privileges permanently */
1775
/* Removes the GPGME temp directory and all files inside */
1776
if(tempdir_created){
1777
struct dirent **direntries = NULL;
1778
struct dirent *direntry = NULL;
1779
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1781
for(int i = 0; i < ret; i++){
1782
direntry = direntries[i];
1783
char *fullname = NULL;
1784
ret = asprintf(&fullname, "%s/%s", tempdir,
1790
ret = remove(fullname);
1792
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1799
/* need to be cleaned even if ret == 0 because man page dont specify */
1804
ret = rmdir(tempdir);
1805
if(ret == -1 and errno != ENOENT){
1811
sigemptyset(&old_sigterm_action.sa_mask);
1812
old_sigterm_action.sa_handler = SIG_DFL;
1813
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1814
&old_sigterm_action,
1817
perror("sigaction");
1820
ret = raise(signal_received);
1821
} while(ret != 0 and errno == EINTR);
1826
TEMP_FAILURE_RETRY(pause());
689
/* Check if creating the server object succeeded */
691
fprintf(stderr, "Failed to create server: %s\n",
692
avahi_strerror(error));
693
returncode = EXIT_FAILURE;
697
/* Create the service browser */
698
sb = avahi_s_service_browser_new(server,
700
if_nametoindex(interface),
702
"_mandos._tcp", NULL, 0,
703
browse_callback, server);
705
fprintf(stderr, "Failed to create service browser: %s\n",
706
avahi_strerror(avahi_server_errno(server)));
707
returncode = EXIT_FAILURE;
711
/* Run the main loop */
714
fprintf(stderr, "Starting avahi loop search\n");
717
avahi_simple_poll_loop(simple_poll);
722
fprintf(stderr, "%s exiting\n", argv[0]);
727
avahi_s_service_browser_free(sb);
730
avahi_server_free(server);
733
avahi_simple_poll_free(simple_poll);