156
166
const char *priority;
158
168
server *current_server;
170
size_t interfaces_size;
159
171
} mandos_context;
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
167
176
sig_atomic_t quit_now = 0;
168
177
int signal_received = 0;
170
179
/* Function to use when printing errors */
171
180
void perror_plus(const char *print_text){
172
182
fprintf(stderr, "Mandos plugin %s: ",
173
183
program_invocation_short_name);
174
185
perror(print_text);
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
191
va_start (ap, format);
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
178
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
200
* bytes. "buffer_capacity" is how much is currently allocated,
180
201
* "buffer_length" is how much is already used.
203
__attribute__((nonnull, warn_unused_result))
182
204
size_t incbuffer(char **buffer, size_t buffer_length,
183
size_t buffer_capacity){
205
size_t buffer_capacity){
184
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
209
int old_errno = errno;
189
216
buffer_capacity += BUFFER_SIZE;
191
218
return buffer_capacity;
194
221
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port,
196
AvahiIfIndex if_index,
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
199
226
server *new_server = malloc(sizeof(server));
200
227
if(new_server == NULL){
201
228
perror_plus("malloc");
204
231
*new_server = (server){ .ip = strdup(ip),
206
.if_index = if_index,
233
.if_index = if_index,
208
235
if(new_server->ip == NULL){
209
236
perror_plus("strdup");
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
242
perror_plus("clock_gettime");
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
247
free((char *)(new_server->ip));
249
#pragma GCC diagnostic pop
212
254
/* Special case of first server */
213
if (mc.current_server == NULL){
255
if(*current_server == NULL){
214
256
new_server->next = new_server;
215
257
new_server->prev = new_server;
216
mc.current_server = new_server;
217
/* Place the new server last in the list */
258
*current_server = new_server;
219
new_server->next = mc.current_server;
220
new_server->prev = mc.current_server->prev;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
221
263
new_server->prev->next = new_server;
222
mc.current_server->prev = new_server;
224
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
226
perror_plus("clock_gettime");
264
(*current_server)->prev = new_server;
233
270
* Initialize GPGME.
235
static bool init_gpgme(const char *seckey,
236
const char *pubkey, const char *tempdir){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
237
277
gpgme_error_t rc;
238
278
gpgme_engine_info_t engine_info;
242
281
* Helper function to insert pub and seckey to the engine keyring.
244
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
247
286
gpgme_data_t pgp_data;
343
379
ssize_t plaintext_length = 0;
346
fprintf(stderr, "Mandos plugin mandos-client: "
347
"Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
350
385
/* Create new GPGME data buffer from memory cryptotext */
351
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
353
388
if(rc != GPG_ERR_NO_ERROR){
354
fprintf(stderr, "Mandos plugin mandos-client: "
355
"bad gpgme_data_new_from_mem: %s: %s\n",
356
gpgme_strsource(rc), gpgme_strerror(rc));
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
360
394
/* Create new empty GPGME data buffer for the plaintext */
361
395
rc = gpgme_data_new(&dh_plain);
362
396
if(rc != GPG_ERR_NO_ERROR){
363
fprintf(stderr, "Mandos plugin mandos-client: "
364
"bad gpgme_data_new: %s: %s\n",
365
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
366
400
gpgme_data_release(dh_crypto);
370
404
/* Decrypt data from the cryptotext data buffer to the plaintext
372
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
373
407
if(rc != GPG_ERR_NO_ERROR){
374
fprintf(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_op_decrypt: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
377
410
plaintext_length = -1;
379
412
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
381
414
if(result == NULL){
382
fprintf(stderr, "Mandos plugin mandos-client: "
383
"gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
385
fprintf(stderr, "Mandos plugin mandos-client: "
386
"Unsupported algorithm: %s\n",
387
result->unsupported_algorithm);
388
fprintf(stderr, "Mandos plugin mandos-client: "
389
"Wrong key usage: %u\n",
390
result->wrong_key_usage);
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
391
421
if(result->file_name != NULL){
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
395
424
gpgme_recipient_t recipient;
396
425
recipient = result->recipients;
397
426
while(recipient != NULL){
398
fprintf(stderr, "Mandos plugin mandos-client: "
399
"Public key algorithm: %s\n",
400
gpgme_pubkey_algo_name(recipient->pubkey_algo));
401
fprintf(stderr, "Mandos plugin mandos-client: "
402
"Key ID: %s\n", recipient->keyid);
403
fprintf(stderr, "Mandos plugin mandos-client: "
404
"Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
407
434
recipient = recipient->next;
509
536
/* OpenPGP credentials */
510
ret = gnutls_certificate_allocate_credentials(&mc.cred);
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
511
538
if(ret != GNUTLS_E_SUCCESS){
512
fprintf(stderr, "Mandos plugin mandos-client: "
513
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
514
541
gnutls_global_deinit();
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"Attempting to use OpenPGP public key %s and"
521
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
525
552
ret = gnutls_certificate_set_openpgp_key_file
526
(mc.cred, pubkeyfilename, seckeyfilename,
553
(mc->cred, pubkeyfilename, seckeyfilename,
527
554
GNUTLS_OPENPGP_FMT_BASE64);
528
555
if(ret != GNUTLS_E_SUCCESS){
530
"Mandos plugin mandos-client: "
531
"Error[%d] while reading the OpenPGP key pair ('%s',"
532
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
533
fprintf(stderr, "Mandos plugin mandos-client: "
534
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
558
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
559
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
safer_gnutls_strerror(ret));
538
564
/* GnuTLS server initialization */
539
ret = gnutls_dh_params_init(&mc.dh_params);
565
ret = gnutls_dh_params_init(&mc->dh_params);
540
566
if(ret != GNUTLS_E_SUCCESS){
541
fprintf(stderr, "Mandos plugin mandos-client: "
542
"Error in GnuTLS DH parameter initialization:"
543
" %s\n", safer_gnutls_strerror(ret));
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
547
573
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS prime generation: %s\n",
550
safer_gnutls_strerror(ret));
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
554
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
560
gnutls_certificate_free_credentials(mc.cred);
585
gnutls_certificate_free_credentials(mc->cred);
561
586
gnutls_global_deinit();
562
gnutls_dh_params_deinit(mc.dh_params);
587
gnutls_dh_params_deinit(mc->dh_params);
566
static int init_gnutls_session(gnutls_session_t *session){
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
568
595
/* GnuTLS session creation */
625
650
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
626
651
__attribute__((unused)) const char *txt){}
653
/* Set effective uid to 0, return errno */
654
__attribute__((warn_unused_result))
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
658
if(seteuid(0) == -1){
665
/* Set effective and real user ID to 0. Return errno. */
666
__attribute__((warn_unused_result))
667
error_t raise_privileges_permanently(void){
668
error_t old_errno = errno;
669
error_t ret_errno = raise_privileges();
681
/* Set effective user ID to unprivileged saved user ID */
682
__attribute__((warn_unused_result))
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
686
if(seteuid(uid) == -1){
693
/* Lower privileges permanently */
694
__attribute__((warn_unused_result))
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
698
if(setuid(uid) == -1){
705
/* Helper function to add_local_route() and remove_local_route() */
706
__attribute__((nonnull, warn_unused_result))
707
static bool add_remove_local_route(const bool add,
709
AvahiIfIndex if_index){
711
char helper[] = "mandos-client-iprouteadddel";
712
char add_arg[] = "add";
713
char delete_arg[] = "delete";
714
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
715
if(pluginhelperdir == NULL){
717
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
718
" variable not set; cannot run helper\n");
723
char interface[IF_NAMESIZE];
724
if(if_indextoname((unsigned int)if_index, interface) == NULL){
725
perror_plus("if_indextoname");
729
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
731
perror_plus("open(\"/dev/null\", O_RDONLY)");
737
/* Raise privileges */
738
errno = raise_privileges_permanently();
740
perror_plus("Failed to raise privileges");
741
/* _exit(EX_NOPERM); */
747
perror_plus("setgid");
750
/* Reset supplementary groups */
752
ret = setgroups(0, NULL);
754
perror_plus("setgroups");
758
ret = dup2(devnull, STDIN_FILENO);
760
perror_plus("dup2(devnull, STDIN_FILENO)");
763
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
765
perror_plus("close");
768
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
770
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
773
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
778
if(helperdir_fd == -1){
780
_exit(EX_UNAVAILABLE);
782
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
785
perror_plus("openat");
786
_exit(EX_UNAVAILABLE);
788
TEMP_FAILURE_RETRY(close(helperdir_fd));
790
#pragma GCC diagnostic push
791
#pragma GCC diagnostic ignored "-Wcast-qual"
793
if(fexecve(helper_fd, (char *const [])
794
{ helper, add ? add_arg : delete_arg, (char *)address,
795
interface, NULL }, environ) == -1){
797
#pragma GCC diagnostic pop
799
perror_plus("fexecve");
811
pret = waitpid(pid, &status, 0);
812
if(pret == -1 and errno == EINTR and quit_now){
813
int errno_raising = 0;
814
if((errno = raise_privileges()) != 0){
815
errno_raising = errno;
816
perror_plus("Failed to raise privileges in order to"
817
" kill helper program");
819
if(kill(pid, SIGTERM) == -1){
822
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
823
perror_plus("Failed to lower privileges after killing"
828
} while(pret == -1 and errno == EINTR);
830
perror_plus("waitpid");
833
if(WIFEXITED(status)){
834
if(WEXITSTATUS(status) != 0){
835
fprintf_plus(stderr, "Error: iprouteadddel exited"
836
" with status %d\n", WEXITSTATUS(status));
841
if(WIFSIGNALED(status)){
842
fprintf_plus(stderr, "Error: iprouteadddel died by"
843
" signal %d\n", WTERMSIG(status));
846
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
850
__attribute__((nonnull, warn_unused_result))
851
static bool add_local_route(const char *address,
852
AvahiIfIndex if_index){
853
return add_remove_local_route(true, address, if_index);
856
__attribute__((nonnull, warn_unused_result))
857
static bool remove_local_route(const char *address,
858
AvahiIfIndex if_index){
859
return add_remove_local_route(false, address, if_index);
628
862
/* Called when a Mandos server is found */
629
static int start_mandos_communication(const char *ip, uint16_t port,
863
__attribute__((nonnull, warn_unused_result))
864
static int start_mandos_communication(const char *ip, in_port_t port,
630
865
AvahiIfIndex if_index,
866
int af, mandos_context *mc){
632
867
int ret, tcp_sd = -1;
635
struct sockaddr_in in;
636
struct sockaddr_in6 in6;
869
struct sockaddr_storage to;
638
870
char *buffer = NULL;
639
871
char *decrypted_buffer = NULL;
640
872
size_t buffer_length = 0;
662
fprintf(stderr, "Mandos plugin mandos-client: "
663
"Bad address family: %d\n", af);
895
fprintf_plus(stderr, "Bad address family: %d\n", af);
668
ret = init_gnutls_session(&session);
900
/* If the interface is specified and we have a list of interfaces */
901
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
902
/* Check if the interface is one of the interfaces we are using */
905
char *interface = NULL;
906
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
908
if(if_nametoindex(interface) == (unsigned int)if_index){
915
/* This interface does not match any in the list, so we don't
916
connect to the server */
918
char interface[IF_NAMESIZE];
919
if(if_indextoname((unsigned int)if_index, interface) == NULL){
920
perror_plus("if_indextoname");
922
fprintf_plus(stderr, "Skipping server on non-used interface"
924
if_indextoname((unsigned int)if_index,
932
ret = init_gnutls_session(&session, mc);
674
fprintf(stderr, "Mandos plugin mandos-client: "
675
"Setting up a TCP connection to %s, port %" PRIu16
938
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
939
PRIuMAX "\n", ip, (uintmax_t)port);
679
tcp_sd = socket(pf, SOCK_STREAM, 0);
942
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
682
945
perror_plus("socket");
745
1000
if(if_indextoname((unsigned int)if_index, interface) == NULL){
746
1001
perror_plus("if_indextoname");
748
fprintf(stderr, "Mandos plugin mandos-client: "
749
"Connection to: %s%%%s, port %" PRIu16 "\n",
750
ip, interface, port);
1003
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1004
"\n", ip, interface, (uintmax_t)port);
753
fprintf(stderr, "Mandos plugin mandos-client: "
754
"Connection to: %s, port %" PRIu16 "\n", ip, port);
1007
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1008
ip, (uintmax_t)port);
756
1010
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
757
1011
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
760
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
763
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
767
perror_plus("inet_ntop");
769
if(strcmp(addrstr, ip) != 0){
770
fprintf(stderr, "Mandos plugin mandos-client: "
771
"Canonical address form: %s\n", addrstr);
782
ret = connect(tcp_sd, &to.in6, sizeof(to));
784
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
787
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
789
perror_plus("connect");
1013
ret = getnameinfo((struct sockaddr *)&to,
1014
sizeof(struct sockaddr_in6),
1015
addrstr, sizeof(addrstr), NULL, 0,
1018
ret = getnameinfo((struct sockaddr *)&to,
1019
sizeof(struct sockaddr_in),
1020
addrstr, sizeof(addrstr), NULL, 0,
1023
if(ret == EAI_SYSTEM){
1024
perror_plus("getnameinfo");
1025
} else if(ret != 0) {
1026
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1027
} else if(strcmp(addrstr, ip) != 0){
1028
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1039
ret = connect(tcp_sd, (struct sockaddr *)&to,
1040
sizeof(struct sockaddr_in6));
1042
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1043
sizeof(struct sockaddr_in));
1046
if(errno == ENETUNREACH
1047
and if_index != AVAHI_IF_UNSPEC
1048
and connect_to == NULL
1049
and not route_added and
1050
((af == AF_INET6 and not
1051
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1053
or (af == AF_INET and
1054
/* Not a a IPv4LL address */
1055
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1056
& 0xFFFF0000L) != 0xA9FE0000L))){
1057
/* Work around Avahi bug - Avahi does not announce link-local
1058
addresses if it has a global address, so local hosts with
1059
*only* a link-local address (e.g. Mandos clients) cannot
1060
connect to a Mandos server announced by Avahi on a server
1061
host with a global address. Work around this by retrying
1062
with an explicit route added with the server's address.
1064
Avahi bug reference:
1065
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1066
https://bugs.debian.org/587961
1069
route_added = add_local_route(ip, if_index);
1075
if(errno != ECONNREFUSED or debug){
1077
perror_plus("connect");
800
1090
const char *out = mandos_protocol_version;
1045
1343
char ip[AVAHI_ADDRESS_STR_MAX];
1046
1344
avahi_address_snprint(ip, sizeof(ip), address);
1048
fprintf(stderr, "Mandos plugin mandos-client: "
1049
"Mandos server \"%s\" found on %s (%s, %"
1050
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1051
ip, (intmax_t)interface, port);
1346
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1347
PRIdMAX ") on port %" PRIu16 "\n", name,
1348
host_name, ip, (intmax_t)interface, port);
1053
int ret = start_mandos_communication(ip, port, interface,
1054
avahi_proto_to_af(proto));
1350
int ret = start_mandos_communication(ip, (in_port_t)port,
1352
avahi_proto_to_af(proto),
1056
avahi_simple_poll_quit(mc.simple_poll);
1355
avahi_simple_poll_quit(simple_poll);
1058
ret = add_server(ip, port, interface,
1059
avahi_proto_to_af(proto));
1357
if(not add_server(ip, (in_port_t)port, interface,
1358
avahi_proto_to_af(proto),
1359
&((mandos_context*)mc)->current_server)){
1360
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1128
1435
signal_received = sig;
1129
1436
int old_errno = errno;
1130
1437
/* set main loop to exit */
1131
if(mc.simple_poll != NULL){
1132
avahi_simple_poll_quit(mc.simple_poll);
1438
if(simple_poll != NULL){
1439
avahi_simple_poll_quit(simple_poll);
1134
1441
errno = old_errno;
1444
__attribute__((nonnull, warn_unused_result))
1137
1445
bool get_flags(const char *ifname, struct ifreq *ifr){
1140
1449
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1142
1452
perror_plus("socket");
1145
1456
strcpy(ifr->ifr_name, ifname);
1146
1457
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1149
1461
perror_plus("ioctl SIOCGIFFLAGS");
1469
__attribute__((nonnull, warn_unused_result))
1156
1470
bool good_flags(const char *ifname, const struct ifreq *ifr){
1158
1472
/* Reject the loopback device */
1159
1473
if(ifr->ifr_flags & IFF_LOOPBACK){
1161
fprintf(stderr, "Mandos plugin mandos-client: "
1162
"Rejecting loopback interface \"%s\"\n", ifname);
1475
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1166
1480
/* Accept point-to-point devices only if connect_to is specified */
1167
1481
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1169
fprintf(stderr, "Mandos plugin mandos-client: "
1170
"Accepting point-to-point interface \"%s\"\n", ifname);
1483
fprintf_plus(stderr, "Accepting point-to-point interface"
1484
" \"%s\"\n", ifname);
1174
1488
/* Otherwise, reject non-broadcast-capable devices */
1175
1489
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1177
fprintf(stderr, "Mandos plugin mandos-client: "
1178
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1491
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1492
" \"%s\"\n", ifname);
1182
1496
/* Reject non-ARP interfaces (including dummy interfaces) */
1183
1497
if(ifr->ifr_flags & IFF_NOARP){
1185
fprintf(stderr, "Mandos plugin mandos-client: "
1186
"Rejecting non-ARP interface \"%s\"\n", ifname);
1499
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1191
1505
/* Accept this device */
1193
fprintf(stderr, "Mandos plugin mandos-client: "
1194
"Interface \"%s\" is good\n", ifname);
1507
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1209
1523
struct ifreq ifr;
1210
1524
if(not get_flags(if_entry->d_name, &ifr)){
1212
fprintf(stderr, "Mandos plugin mandos-client: "
1213
"Failed to get flags for interface \"%s\"\n",
1219
if(not good_flags(if_entry->d_name, &ifr)){
1226
* This function determines if a directory entry in /sys/class/net
1227
* corresponds to an acceptable network device which is up.
1228
* (This function is passed to scandir(3) as a filter function.)
1230
int up_interface(const struct dirent *if_entry){
1231
if(if_entry->d_name[0] == '.'){
1236
if(not get_flags(if_entry->d_name, &ifr)){
1238
fprintf(stderr, "Mandos plugin mandos-client: "
1239
"Failed to get flags for interface \"%s\"\n",
1245
/* Reject down interfaces */
1246
if(not (ifr.ifr_flags & IFF_UP)){
1248
fprintf(stderr, "Mandos plugin mandos-client: "
1249
"Rejecting down interface \"%s\"\n",
1255
/* Reject non-running interfaces */
1256
if(not (ifr.ifr_flags & IFF_RUNNING)){
1258
fprintf(stderr, "Mandos plugin mandos-client: "
1259
"Rejecting non-running interface \"%s\"\n",
1265
if(not good_flags(if_entry->d_name, &ifr)){
1526
fprintf_plus(stderr, "Failed to get flags for interface "
1527
"\"%s\"\n", if_entry->d_name);
1532
if(not good_flags(if_entry->d_name, &ifr)){
1539
* This function determines if a network interface is up.
1541
__attribute__((nonnull, warn_unused_result))
1542
bool interface_is_up(const char *interface){
1544
if(not get_flags(interface, &ifr)){
1546
fprintf_plus(stderr, "Failed to get flags for interface "
1547
"\"%s\"\n", interface);
1552
return (bool)(ifr.ifr_flags & IFF_UP);
1556
* This function determines if a network interface is running
1558
__attribute__((nonnull, warn_unused_result))
1559
bool interface_is_running(const char *interface){
1561
if(not get_flags(interface, &ifr)){
1563
fprintf_plus(stderr, "Failed to get flags for interface "
1564
"\"%s\"\n", interface);
1569
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1572
__attribute__((nonnull, pure, warn_unused_result))
1271
1573
int notdotentries(const struct dirent *direntry){
1272
1574
/* Skip "." and ".." */
1273
1575
if(direntry->d_name[0] == '.'
1292
/* Save pointer to last character */
1293
char *end = strchr(direntry->d_name, '\0')-1;
1300
if(((direntry->d_name)[0] == '#')
1302
/* Temporary #name# */
1306
/* XXX more rules here */
1308
char *fullname = NULL;
1309
ret = asprintf(&fullname, "%s/%s", hookdir,
1312
perror_plus("asprintf");
1316
ret = stat(fullname, &st);
1596
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1597
"abcdefghijklmnopqrstuvwxyz"
1600
if((direntry->d_name)[sret] != '\0'){
1601
/* Contains non-allowed characters */
1603
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1609
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1319
perror_plus("Could not stat plugin");
1612
perror_plus("Could not stat hook");
1323
1616
if(not (S_ISREG(st.st_mode))){
1324
1617
/* Not a regular file */
1619
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1327
1624
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1328
1625
/* Not executable */
1627
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1633
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1334
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1639
__attribute__((nonnull, warn_unused_result))
1640
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1641
mandos_context *mc){
1336
1643
struct timespec now;
1337
1644
struct timespec waited_time;
1338
1645
intmax_t block_time;
1341
if(mc.current_server == NULL){
1343
fprintf(stderr, "Mandos plugin mandos-client: "
1344
"Wait until first server is found. No timeout!\n");
1648
if(mc->current_server == NULL){
1650
fprintf_plus(stderr, "Wait until first server is found."
1346
1653
ret = avahi_simple_poll_iterate(s, -1);
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Check current_server if we should run it,"
1656
fprintf_plus(stderr, "Check current_server if we should run"
1353
1659
/* the current time */
1354
1660
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1397
1703
ret = avahi_simple_poll_iterate(s, (int)block_time);
1400
if (ret > 0 or errno != EINTR){
1706
if(ret > 0 or errno != EINTR){
1401
1707
return (ret != 1) ? ret : 0;
1713
__attribute__((nonnull))
1714
void run_network_hooks(const char *mode, const char *interface,
1716
struct dirent **direntries = NULL;
1717
if(hookdir_fd == -1){
1718
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1720
if(hookdir_fd == -1){
1721
if(errno == ENOENT){
1723
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1724
" found\n", hookdir);
1727
perror_plus("open");
1733
#if __GLIBC_PREREQ(2, 15)
1734
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1735
runnable_hook, alphasort);
1736
#else /* not __GLIBC_PREREQ(2, 15) */
1737
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1739
#endif /* not __GLIBC_PREREQ(2, 15) */
1740
#else /* not __GLIBC__ */
1741
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1743
#endif /* not __GLIBC__ */
1745
perror_plus("scandir");
1748
struct dirent *direntry;
1750
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1752
perror_plus("open(\"/dev/null\", O_RDONLY)");
1755
for(int i = 0; i < numhooks; i++){
1756
direntry = direntries[i];
1758
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1761
pid_t hook_pid = fork();
1764
/* Raise privileges */
1765
errno = raise_privileges_permanently();
1767
perror_plus("Failed to raise privileges");
1774
perror_plus("setgid");
1777
/* Reset supplementary groups */
1779
ret = setgroups(0, NULL);
1781
perror_plus("setgroups");
1784
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1786
perror_plus("setenv");
1789
ret = setenv("DEVICE", interface, 1);
1791
perror_plus("setenv");
1794
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1796
perror_plus("setenv");
1799
ret = setenv("MODE", mode, 1);
1801
perror_plus("setenv");
1805
ret = asprintf(&delaystring, "%f", (double)delay);
1807
perror_plus("asprintf");
1810
ret = setenv("DELAY", delaystring, 1);
1813
perror_plus("setenv");
1817
if(connect_to != NULL){
1818
ret = setenv("CONNECT", connect_to, 1);
1820
perror_plus("setenv");
1824
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1828
perror_plus("openat");
1829
_exit(EXIT_FAILURE);
1831
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1832
perror_plus("close");
1833
_exit(EXIT_FAILURE);
1835
ret = dup2(devnull, STDIN_FILENO);
1837
perror_plus("dup2(devnull, STDIN_FILENO)");
1840
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1842
perror_plus("close");
1845
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1847
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1850
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1852
perror_plus("fexecve");
1853
_exit(EXIT_FAILURE);
1857
perror_plus("fork");
1862
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1863
perror_plus("waitpid");
1867
if(WIFEXITED(status)){
1868
if(WEXITSTATUS(status) != 0){
1869
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1870
" with status %d\n", direntry->d_name,
1871
WEXITSTATUS(status));
1875
} else if(WIFSIGNALED(status)){
1876
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1877
" signal %d\n", direntry->d_name,
1882
fprintf_plus(stderr, "Warning: network hook \"%s\""
1883
" crashed\n", direntry->d_name);
1889
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1895
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1896
perror_plus("close");
1903
__attribute__((nonnull, warn_unused_result))
1904
error_t bring_up_interface(const char *const interface,
1906
error_t old_errno = errno;
1908
struct ifreq network;
1909
unsigned int if_index = if_nametoindex(interface);
1911
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1921
if(not interface_is_up(interface)){
1922
error_t ret_errno = 0, ioctl_errno = 0;
1923
if(not get_flags(interface, &network)){
1925
fprintf_plus(stderr, "Failed to get flags for interface "
1926
"\"%s\"\n", interface);
1930
network.ifr_flags |= IFF_UP; /* set flag */
1932
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1935
perror_plus("socket");
1941
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1943
perror_plus("close");
1950
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1954
/* Raise privileges */
1955
ret_errno = raise_privileges();
1958
perror_plus("Failed to raise privileges");
1963
bool restore_loglevel = false;
1965
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1966
messages about the network interface to mess up the prompt */
1967
ret_linux = klogctl(8, NULL, 5);
1968
if(ret_linux == -1){
1969
perror_plus("klogctl");
1971
restore_loglevel = true;
1974
#endif /* __linux__ */
1975
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1976
ioctl_errno = errno;
1978
if(restore_loglevel){
1979
ret_linux = klogctl(7, NULL, 0);
1980
if(ret_linux == -1){
1981
perror_plus("klogctl");
1984
#endif /* __linux__ */
1986
/* If raise_privileges() succeeded above */
1988
/* Lower privileges */
1989
ret_errno = lower_privileges();
1992
perror_plus("Failed to lower privileges");
1996
/* Close the socket */
1997
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1999
perror_plus("close");
2002
if(ret_setflags == -1){
2003
errno = ioctl_errno;
2004
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2009
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2013
/* Sleep checking until interface is running.
2014
Check every 0.25s, up to total time of delay */
2015
for(int i=0; i < delay * 4; i++){
2016
if(interface_is_running(interface)){
2019
struct timespec sleeptime = { .tv_nsec = 250000000 };
2020
ret = nanosleep(&sleeptime, NULL);
2021
if(ret == -1 and errno != EINTR){
2022
perror_plus("nanosleep");
2030
__attribute__((nonnull, warn_unused_result))
2031
error_t take_down_interface(const char *const interface){
2032
error_t old_errno = errno;
2033
struct ifreq network;
2034
unsigned int if_index = if_nametoindex(interface);
2036
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2040
if(interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2042
if(not get_flags(interface, &network) and debug){
2044
fprintf_plus(stderr, "Failed to get flags for interface "
2045
"\"%s\"\n", interface);
2049
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2051
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2054
perror_plus("socket");
2060
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2064
/* Raise privileges */
2065
ret_errno = raise_privileges();
2068
perror_plus("Failed to raise privileges");
2071
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2072
ioctl_errno = errno;
2074
/* If raise_privileges() succeeded above */
2076
/* Lower privileges */
2077
ret_errno = lower_privileges();
2080
perror_plus("Failed to lower privileges");
2084
/* Close the socket */
2085
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2087
perror_plus("close");
2090
if(ret_setflags == -1){
2091
errno = ioctl_errno;
2092
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2097
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1407
2105
int main(int argc, char *argv[]){
2106
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2107
.priority = "SECURE256:!CTYPE-X.509:"
2108
"+CTYPE-OPENPGP", .current_server = NULL,
2109
.interfaces = NULL, .interfaces_size = 0 };
1408
2110
AvahiSServiceBrowser *sb = NULL;
1411
2113
intmax_t tmpmax;
1413
2115
int exitcode = EXIT_SUCCESS;
1414
const char *interface = "";
1415
struct ifreq network;
1417
bool take_down_interface = false;
1420
char tempdir[] = "/tmp/mandosXXXXXX";
1421
bool tempdir_created = false;
2116
char *interfaces_to_take_down = NULL;
2117
size_t interfaces_to_take_down_size = 0;
2118
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2119
char old_tempdir[] = "/tmp/mandosXXXXXX";
2120
char *tempdir = NULL;
1422
2121
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1423
2122
const char *seckey = PATHDIR "/" SECKEY;
1424
2123
const char *pubkey = PATHDIR "/" PUBKEY;
2124
char *interfaces_hooks = NULL;
1426
2126
bool gnutls_initialized = false;
1427
2127
bool gpgme_initialized = false;
1602
2305
/* Work around Debian bug #633582:
1603
2306
<http://bugs.debian.org/633582> */
1606
/* Re-raise priviliges */
1610
perror_plus("seteuid");
1613
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1614
int seckey_fd = open(seckey, O_RDONLY);
1615
if(seckey_fd == -1){
1616
perror_plus("open");
1618
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1620
perror_plus("fstat");
1622
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1623
ret = fchown(seckey_fd, uid, gid);
1625
perror_plus("fchown");
1629
TEMP_FAILURE_RETRY(close(seckey_fd));
1633
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1634
int pubkey_fd = open(pubkey, O_RDONLY);
1635
if(pubkey_fd == -1){
1636
perror_plus("open");
1638
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1640
perror_plus("fstat");
1642
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1643
ret = fchown(pubkey_fd, uid, gid);
1645
perror_plus("fchown");
1649
TEMP_FAILURE_RETRY(close(pubkey_fd));
1653
/* Lower privileges */
1657
perror_plus("seteuid");
1661
/* Find network hooks and run them */
1663
struct dirent **direntries;
1664
struct dirent *direntry;
1665
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1668
perror_plus("scandir");
2308
/* Re-raise privileges */
2309
ret_errno = raise_privileges();
2312
perror_plus("Failed to raise privileges");
1670
int devnull = open("/dev/null", O_RDONLY);
1671
for(int i = 0; i < numhooks; i++){
1672
direntry = direntries[0];
1673
char *fullname = NULL;
1674
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1676
perror_plus("asprintf");
1679
pid_t hook_pid = fork();
1682
dup2(devnull, STDIN_FILENO);
1684
dup2(STDERR_FILENO, STDOUT_FILENO);
1685
ret = setenv("DEVICE", interface, 1);
1687
perror_plus("setenv");
1690
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1692
perror_plus("setenv");
1695
ret = setenv("MODE", "start", 1);
1697
perror_plus("setenv");
1701
ret = asprintf(&delaystring, "%f", delay);
1703
perror_plus("asprintf");
1706
ret = setenv("DELAY", delaystring, 1);
1709
perror_plus("setenv");
1713
ret = execl(fullname, direntry->d_name, "start", NULL);
1714
perror_plus("execl");
1717
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1718
perror_plus("waitpid");
1722
if(WIFEXITED(status)){
1723
if(WEXITSTATUS(status) != 0){
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" exited"
1726
" with status %d\n", direntry->d_name,
1727
WEXITSTATUS(status));
1731
} else if(WIFSIGNALED(status)){
1732
fprintf(stderr, "Mandos plugin mandos-client: "
1733
"Warning: network hook \"%s\" died by"
1734
" signal %d\n", direntry->d_name,
1739
fprintf(stderr, "Mandos plugin mandos-client: "
1740
"Warning: network hook \"%s\" crashed\n",
2316
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2317
int seckey_fd = open(seckey, O_RDONLY);
2318
if(seckey_fd == -1){
2319
perror_plus("open");
2321
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2323
perror_plus("fstat");
2325
if(S_ISREG(st.st_mode)
2326
and st.st_uid == 0 and st.st_gid == 0){
2327
ret = fchown(seckey_fd, uid, gid);
2329
perror_plus("fchown");
2333
TEMP_FAILURE_RETRY(close(seckey_fd));
2337
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2338
int pubkey_fd = open(pubkey, O_RDONLY);
2339
if(pubkey_fd == -1){
2340
perror_plus("open");
2342
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2344
perror_plus("fstat");
2346
if(S_ISREG(st.st_mode)
2347
and st.st_uid == 0 and st.st_gid == 0){
2348
ret = fchown(pubkey_fd, uid, gid);
2350
perror_plus("fchown");
2354
TEMP_FAILURE_RETRY(close(pubkey_fd));
2358
/* Lower privileges */
2359
ret_errno = lower_privileges();
2362
perror_plus("Failed to lower privileges");
2367
/* Remove invalid interface names (except "none") */
2369
char *interface = NULL;
2370
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2372
if(strcmp(interface, "none") != 0
2373
and if_nametoindex(interface) == 0){
2374
if(interface[0] != '\0'){
2375
fprintf_plus(stderr, "Not using nonexisting interface"
2376
" \"%s\"\n", interface);
2378
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2384
/* Run network hooks */
2386
if(mc.interfaces != NULL){
2387
interfaces_hooks = malloc(mc.interfaces_size);
2388
if(interfaces_hooks == NULL){
2389
perror_plus("malloc");
2392
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2393
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2395
run_network_hooks("start", interfaces_hooks != NULL ?
2396
interfaces_hooks : "", delay);
1756
2400
avahi_set_log_function(empty_log);
1759
if(interface[0] == '\0'){
1760
struct dirent **direntries;
1761
/* First look for interfaces that are up */
1762
ret = scandir(sys_class_net, &direntries, up_interface,
1765
/* No up interfaces, look for any good interfaces */
1767
ret = scandir(sys_class_net, &direntries, good_interface,
1771
/* Pick the first interface returned */
1772
interface = strdup(direntries[0]->d_name);
1774
fprintf(stderr, "Mandos plugin mandos-client: "
1775
"Using interface \"%s\"\n", interface);
1777
if(interface == NULL){
1778
perror_plus("malloc");
1780
exitcode = EXIT_FAILURE;
1786
fprintf(stderr, "Mandos plugin mandos-client: "
1787
"Could not find a network interface\n");
1788
exitcode = EXIT_FAILURE;
1793
2403
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1794
2404
from the signal handler */
1795
2405
/* Initialize the pseudo-RNG for Avahi */
1796
2406
srand((unsigned int) time(NULL));
1797
mc.simple_poll = avahi_simple_poll_new();
1798
if(mc.simple_poll == NULL){
1799
fprintf(stderr, "Mandos plugin mandos-client: "
1800
"Avahi: Failed to create simple poll object.\n");
2407
simple_poll = avahi_simple_poll_new();
2408
if(simple_poll == NULL){
2409
fprintf_plus(stderr,
2410
"Avahi: Failed to create simple poll object.\n");
1801
2411
exitcode = EX_UNAVAILABLE;
1868
/* If the interface is down, bring it up */
1869
if(strcmp(interface, "none") != 0){
1870
if_index = (AvahiIfIndex) if_nametoindex(interface);
1872
fprintf(stderr, "Mandos plugin mandos-client: "
1873
"No such interface: \"%s\"\n", interface);
1874
exitcode = EX_UNAVAILABLE;
1882
/* Re-raise priviliges */
1886
perror_plus("seteuid");
1890
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1891
messages about the network interface to mess up the prompt */
1892
ret = klogctl(8, NULL, 5);
1893
bool restore_loglevel = true;
1895
restore_loglevel = false;
1896
perror_plus("klogctl");
1898
#endif /* __linux__ */
1900
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1902
perror_plus("socket");
1903
exitcode = EX_OSERR;
1905
if(restore_loglevel){
1906
ret = klogctl(7, NULL, 0);
1908
perror_plus("klogctl");
1911
#endif /* __linux__ */
1912
/* Lower privileges */
1916
perror_plus("seteuid");
1920
strcpy(network.ifr_name, interface);
1921
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1923
perror_plus("ioctl SIOCGIFFLAGS");
1925
if(restore_loglevel){
1926
ret = klogctl(7, NULL, 0);
1928
perror_plus("klogctl");
1931
#endif /* __linux__ */
1932
exitcode = EX_OSERR;
1933
/* Lower privileges */
1937
perror_plus("seteuid");
1941
if((network.ifr_flags & IFF_UP) == 0){
1942
network.ifr_flags |= IFF_UP;
1943
take_down_interface = true;
1944
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1946
take_down_interface = false;
1947
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1948
exitcode = EX_OSERR;
1950
if(restore_loglevel){
1951
ret = klogctl(7, NULL, 0);
1953
perror_plus("klogctl");
2478
/* If no interfaces were specified, make a list */
2479
if(mc.interfaces == NULL){
2480
struct dirent **direntries = NULL;
2481
/* Look for any good interfaces */
2482
ret = scandir(sys_class_net, &direntries, good_interface,
2485
/* Add all found interfaces to interfaces list */
2486
for(int i = 0; i < ret; ++i){
2487
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2488
direntries[i]->d_name);
2491
perror_plus("argz_add");
2492
free(direntries[i]);
2496
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2497
direntries[i]->d_name);
2499
free(direntries[i]);
2506
fprintf_plus(stderr, "Could not find a network interface\n");
2507
exitcode = EXIT_FAILURE;
2512
/* Bring up interfaces which are down, and remove any "none"s */
2514
char *interface = NULL;
2515
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2517
/* If interface name is "none", stop bringing up interfaces.
2518
Also remove all instances of "none" from the list */
2519
if(strcmp(interface, "none") == 0){
2520
argz_delete(&mc.interfaces, &mc.interfaces_size,
2523
while((interface = argz_next(mc.interfaces,
2524
mc.interfaces_size, interface))){
2525
if(strcmp(interface, "none") == 0){
2526
argz_delete(&mc.interfaces, &mc.interfaces_size,
1956
#endif /* __linux__ */
1957
/* Lower privileges */
1961
perror_plus("seteuid");
1966
/* Sleep checking until interface is running.
1967
Check every 0.25s, up to total time of delay */
1968
for(int i=0; i < delay * 4; i++){
1969
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1971
perror_plus("ioctl SIOCGIFFLAGS");
1972
} else if(network.ifr_flags & IFF_RUNNING){
1975
struct timespec sleeptime = { .tv_nsec = 250000000 };
1976
ret = nanosleep(&sleeptime, NULL);
1977
if(ret == -1 and errno != EINTR){
1978
perror_plus("nanosleep");
1981
if(not take_down_interface){
1982
/* We won't need the socket anymore */
1983
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1985
perror_plus("close");
1989
if(restore_loglevel){
1990
/* Restores kernel loglevel to default */
1991
ret = klogctl(7, NULL, 0);
1993
perror_plus("klogctl");
1996
#endif /* __linux__ */
1997
/* Lower privileges */
1999
if(take_down_interface){
2000
/* Lower privileges */
2003
perror_plus("seteuid");
2006
/* Lower privileges permanently */
2009
perror_plus("setuid");
2533
bool interface_was_up = interface_is_up(interface);
2534
errno = bring_up_interface(interface, delay);
2535
if(not interface_was_up){
2537
perror_plus("Failed to bring up interface");
2539
errno = argz_add(&interfaces_to_take_down,
2540
&interfaces_to_take_down_size,
2543
perror_plus("argz_add");
2548
if(debug and (interfaces_to_take_down == NULL)){
2549
fprintf_plus(stderr, "No interfaces were brought up\n");
2553
/* If we only got one interface, explicitly use only that one */
2554
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2556
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2559
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2018
ret = init_gnutls_global(pubkey, seckey);
2566
ret = init_gnutls_global(pubkey, seckey, &mc);
2020
fprintf(stderr, "Mandos plugin mandos-client: "
2021
"init_gnutls_global failed\n");
2568
fprintf_plus(stderr, "init_gnutls_global failed\n");
2022
2569
exitcode = EX_UNAVAILABLE;
2214
2765
if(gpgme_initialized){
2215
2766
gpgme_release(mc.ctx);
2218
2769
/* Cleans up the circular linked list of Mandos servers the client
2220
2771
if(mc.current_server != NULL){
2221
2772
mc.current_server->prev->next = NULL;
2222
2773
while(mc.current_server != NULL){
2223
2774
server *next = mc.current_server->next;
2776
#pragma GCC diagnostic push
2777
#pragma GCC diagnostic ignored "-Wcast-qual"
2779
free((char *)(mc.current_server->ip));
2781
#pragma GCC diagnostic pop
2224
2783
free(mc.current_server);
2225
2784
mc.current_server = next;
2229
/* XXX run network hooks "stop" here */
2231
/* Take down the network interface */
2232
if(take_down_interface){
2233
/* Re-raise priviliges */
2237
perror_plus("seteuid");
2788
/* Re-raise privileges */
2790
ret_errno = raise_privileges();
2793
perror_plus("Failed to raise privileges");
2796
/* Run network hooks */
2797
run_network_hooks("stop", interfaces_hooks != NULL ?
2798
interfaces_hooks : "", delay);
2800
/* Take down the network interfaces which were brought up */
2802
char *interface = NULL;
2803
while((interface=argz_next(interfaces_to_take_down,
2804
interfaces_to_take_down_size,
2806
ret_errno = take_down_interface(interface);
2809
perror_plus("Failed to take down interface");
2812
if(debug and (interfaces_to_take_down == NULL)){
2813
fprintf_plus(stderr, "No interfaces needed to be taken"
2240
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2242
perror_plus("ioctl SIOCGIFFLAGS");
2243
} else if(network.ifr_flags & IFF_UP){
2244
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2245
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2247
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2250
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2252
perror_plus("close");
2254
/* Lower privileges permanently */
2258
perror_plus("setuid");
2819
ret_errno = lower_privileges_permanently();
2822
perror_plus("Failed to lower privileges permanently");
2826
free(interfaces_to_take_down);
2827
free(interfaces_hooks);
2263
2829
/* Removes the GPGME temp directory and all files inside */
2264
if(tempdir_created){
2830
if(tempdir != NULL){
2265
2831
struct dirent **direntries = NULL;
2266
struct dirent *direntry = NULL;
2267
int numentries = scandir(tempdir, &direntries, notdotentries,
2269
if (numentries > 0){
2270
for(int i = 0; i < numentries; i++){
2271
direntry = direntries[i];
2272
char *fullname = NULL;
2273
ret = asprintf(&fullname, "%s/%s", tempdir,
2276
perror_plus("asprintf");
2279
ret = remove(fullname);
2281
fprintf(stderr, "Mandos plugin mandos-client: "
2282
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2832
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2836
if(tempdir_fd == -1){
2837
perror_plus("open");
2840
#if __GLIBC_PREREQ(2, 15)
2841
int numentries = scandirat(tempdir_fd, ".", &direntries,
2842
notdotentries, alphasort);
2843
#else /* not __GLIBC_PREREQ(2, 15) */
2844
int numentries = scandir(tempdir, &direntries, notdotentries,
2846
#endif /* not __GLIBC_PREREQ(2, 15) */
2847
#else /* not __GLIBC__ */
2848
int numentries = scandir(tempdir, &direntries, notdotentries,
2850
#endif /* not __GLIBC__ */
2851
if(numentries >= 0){
2852
for(int i = 0; i < numentries; i++){
2853
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2855
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2856
" \"%s\", 0): %s\n", tempdir,
2857
direntries[i]->d_name, strerror(errno));
2859
free(direntries[i]);
2862
/* need to clean even if 0 because man page doesn't specify */
2864
if(numentries == -1){
2865
perror_plus("scandir");
2867
ret = rmdir(tempdir);
2868
if(ret == -1 and errno != ENOENT){
2869
perror_plus("rmdir");
2288
/* need to clean even if 0 because man page doesn't specify */
2290
if (numentries == -1){
2291
perror_plus("scandir");
2293
ret = rmdir(tempdir);
2294
if(ret == -1 and errno != ENOENT){
2295
perror_plus("rmdir");
2872
TEMP_FAILURE_RETRY(close(tempdir_fd));