133
120
#define PATHDIR "/conf/conf.d/mandos"
134
121
#define SECKEY "seckey.txt"
135
122
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
138
124
bool debug = false;
139
125
static const char mandos_protocol_version[] = "1";
140
126
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
153
AvahiIfIndex if_index;
155
struct timespec last_seen;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
160
129
/* Used for passing in values through the Avahi callback functions */
131
AvahiSimplePoll *simple_poll;
162
132
AvahiServer *server;
163
133
gnutls_certificate_credentials_t cred;
164
134
unsigned int dh_bits;
165
135
gnutls_dh_params_t dh_params;
166
136
const char *priority;
168
server *current_server;
170
size_t interfaces_size;
171
138
} mandos_context;
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
176
sig_atomic_t quit_now = 0;
177
int signal_received = 0;
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
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));
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
199
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
147
* bytes. "buffer_capacity" is how much is currently allocated,
201
148
* "buffer_length" is how much is already used.
203
__attribute__((nonnull, warn_unused_result))
204
150
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
151
size_t buffer_capacity){
206
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
209
int old_errno = errno;
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
216
157
buffer_capacity += BUFFER_SIZE;
218
159
return buffer_capacity;
221
/* Add server to set of servers to retry periodically */
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){
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
231
*new_server = (server){ .ip = strdup(ip),
233
.if_index = if_index,
235
if(new_server->ip == NULL){
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
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
270
163
* Initialize GPGME.
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,
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
277
168
gpgme_error_t rc;
278
169
gpgme_engine_info_t engine_info;
281
173
* Helper function to insert pub and seckey to the engine keyring.
283
bool import_key(const char * const filename){
175
bool import_key(const char *filename){
286
177
gpgme_data_t pgp_data;
288
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
294
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
186
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
301
rc = gpgme_op_import(mc->ctx, pgp_data);
192
rc = gpgme_op_import(mc.ctx, pgp_data);
302
193
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
308
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
310
perror_plus("close");
312
203
gpgme_data_release(pgp_data);
317
fprintf_plus(stderr, "Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
321
212
gpgme_check_version(NULL);
322
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
214
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
329
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
330
221
rc = gpgme_get_engine_info(&engine_info);
331
222
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
336
227
while(engine_info != NULL){
379
266
ssize_t plaintext_length = 0;
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
385
272
/* Create new GPGME data buffer from memory cryptotext */
386
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
388
275
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
394
281
/* Create new empty GPGME data buffer for the plaintext */
395
282
rc = gpgme_data_new(&dh_plain);
396
283
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
400
286
gpgme_data_release(dh_crypto);
404
290
/* Decrypt data from the cryptotext data buffer to the plaintext
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
293
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
410
296
plaintext_length = -1;
412
298
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
299
result = gpgme_op_decrypt_result(mc.ctx);
414
300
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
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);
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
421
307
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
424
310
gpgme_recipient_t recipient;
425
311
recipient = result->recipients;
426
312
while(recipient != NULL){
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
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
434
319
recipient = recipient->next;
536
418
/* OpenPGP credentials */
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
538
420
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
safer_gnutls_strerror(ret));
541
426
gnutls_global_deinit();
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
552
436
ret = gnutls_certificate_set_openpgp_key_file
553
(mc->cred, pubkeyfilename, seckeyfilename,
437
(mc.cred, pubkeyfilename, seckeyfilename,
554
438
GNUTLS_OPENPGP_FMT_BASE64);
555
439
if(ret != GNUTLS_E_SUCCESS){
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));
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
564
448
/* GnuTLS server initialization */
565
ret = gnutls_dh_params_init(&mc->dh_params);
449
ret = gnutls_dh_params_init(&mc.dh_params);
566
450
if(ret != GNUTLS_E_SUCCESS){
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
573
456
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
585
gnutls_certificate_free_credentials(mc->cred);
468
gnutls_certificate_free_credentials(mc.cred);
586
469
gnutls_global_deinit();
587
gnutls_dh_params_deinit(mc->dh_params);
470
gnutls_dh_params_deinit(mc.dh_params);
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
474
static int init_gnutls_session(gnutls_session_t *session){
595
476
/* GnuTLS session creation */
597
ret = gnutls_init(session, GNUTLS_SERVER);
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_init(session, GNUTLS_SERVER);
602
478
if(ret != GNUTLS_E_SUCCESS){
604
"Error in GnuTLS session initialization: %s\n",
605
safer_gnutls_strerror(ret));
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
safer_gnutls_strerror(ret));
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
613
gnutls_deinit(*session);
616
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
617
486
if(ret != GNUTLS_E_SUCCESS){
618
fprintf_plus(stderr, "Syntax error at: %s\n", err);
619
fprintf_plus(stderr, "GnuTLS error: %s\n",
620
safer_gnutls_strerror(ret));
487
fprintf(stderr, "Syntax error at: %s\n", err);
488
fprintf(stderr, "GnuTLS error: %s\n",
489
safer_gnutls_strerror(ret));
621
490
gnutls_deinit(*session);
627
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
630
gnutls_deinit(*session);
633
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
634
497
if(ret != GNUTLS_E_SUCCESS){
635
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
636
safer_gnutls_strerror(ret));
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
safer_gnutls_strerror(ret));
637
500
gnutls_deinit(*session);
641
504
/* ignore client certificate if any. */
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
650
514
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
651
515
__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 remove_arg[] = "remove";
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 = 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
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
780
TEMP_FAILURE_RETRY(close(helperdir_fd));
782
#pragma GCC diagnostic push
783
#pragma GCC diagnostic ignored "-Wcast-qual"
785
if(fexecve(helper_fd, (char *const [])
786
{ helper, add ? add_arg : remove_arg, (char *)address,
787
interface, NULL }, environ) == -1){
789
#pragma GCC diagnostic pop
791
perror_plus("fexecve");
803
pret = waitpid(pid, &status, 0);
804
if(pret == -1 and errno == EINTR and quit_now){
805
int errno_raising = 0;
806
if((errno = raise_privileges()) != 0){
807
errno_raising = errno;
808
perror_plus("Failed to raise privileges in order to"
809
" kill helper program");
811
if(kill(pid, SIGTERM) == -1){
814
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
815
perror_plus("Failed to lower privileges after killing"
820
} while(pret == -1 and errno == EINTR);
822
perror_plus("waitpid");
825
if(WIFEXITED(status)){
826
if(WEXITSTATUS(status) != 0){
827
fprintf_plus(stderr, "Error: iprouteadddel exited"
828
" with status %d\n", WEXITSTATUS(status));
833
if(WIFSIGNALED(status)){
834
fprintf_plus(stderr, "Error: iprouteadddel died by"
835
" signal %d\n", WTERMSIG(status));
838
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
842
__attribute__((nonnull, warn_unused_result))
843
static bool add_local_route(const char *address,
844
AvahiIfIndex if_index){
845
return add_remove_local_route(true, address, if_index);
848
__attribute__((nonnull, warn_unused_result))
849
static bool remove_local_route(const char *address,
850
AvahiIfIndex if_index){
851
return add_remove_local_route(false, address, if_index);
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
854
520
/* Called when a Mandos server is found */
855
__attribute__((nonnull, warn_unused_result))
856
static int start_mandos_communication(const char *ip, in_port_t port,
521
static int start_mandos_communication(const char *ip, uint16_t port,
857
522
AvahiIfIndex if_index,
858
int af, mandos_context *mc){
859
int ret, tcp_sd = -1;
861
struct sockaddr_storage to;
527
struct sockaddr_in in;
528
struct sockaddr_in6 in6;
862
530
char *buffer = NULL;
863
char *decrypted_buffer = NULL;
531
char *decrypted_buffer;
864
532
size_t buffer_length = 0;
865
533
size_t buffer_capacity = 0;
534
ssize_t decrypted_buffer_size;
868
537
gnutls_session_t session;
869
538
int pf; /* Protocol family */
870
bool route_added = false;
887
fprintf_plus(stderr, "Bad address family: %d\n", af);
548
fprintf(stderr, "Bad address family: %d\n", af);
892
/* If the interface is specified and we have a list of interfaces */
893
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
894
/* Check if the interface is one of the interfaces we are using */
897
char *interface = NULL;
898
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
900
if(if_nametoindex(interface) == (unsigned int)if_index){
907
/* This interface does not match any in the list, so we don't
908
connect to the server */
910
char interface[IF_NAMESIZE];
911
if(if_indextoname((unsigned int)if_index, interface) == NULL){
912
perror_plus("if_indextoname");
914
fprintf_plus(stderr, "Skipping server on non-used interface"
916
if_indextoname((unsigned int)if_index,
924
ret = init_gnutls_session(&session, mc);
552
ret = init_gnutls_session(&session);
930
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
931
PRIuMAX "\n", ip, (uintmax_t)port);
558
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
934
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
562
tcp_sd = socket(pf, SOCK_STREAM, 0);
937
perror_plus("socket");
947
568
memset(&to, 0, sizeof(to));
948
569
if(af == AF_INET6){
949
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
950
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
570
to.in6.sin6_family = (sa_family_t)af;
571
ret = inet_pton(af, ip, &to.in6.sin6_addr);
951
572
} else { /* IPv4 */
952
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
953
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
573
to.in.sin_family = (sa_family_t)af;
574
ret = inet_pton(af, ip, &to.in.sin_addr);
957
perror_plus("inet_pton");
963
fprintf_plus(stderr, "Bad address: %s\n", ip);
581
fprintf(stderr, "Bad address: %s\n", ip);
967
584
if(af == AF_INET6){
968
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
969
if(IN6_IS_ADDR_LINKLOCAL
970
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
585
to.in6.sin6_port = htons(port); /* Spurious warnings from
587
-Wunreachable-code */
589
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
590
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
971
592
if(if_index == AVAHI_IF_UNSPEC){
972
fprintf_plus(stderr, "An IPv6 link-local address is"
973
" incomplete without a network interface\n");
593
fprintf(stderr, "An IPv6 link-local address is incomplete"
594
" without a network interface\n");
977
597
/* Set the network interface number as scope */
978
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
598
to.in6.sin6_scope_id = (uint32_t)if_index;
981
((struct sockaddr_in *)&to)->sin_port = htons(port);
601
to.in.sin_port = htons(port); /* Spurious warnings from
603
-Wunreachable-code */
990
607
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
991
608
char interface[IF_NAMESIZE];
992
609
if(if_indextoname((unsigned int)if_index, interface) == NULL){
993
perror_plus("if_indextoname");
610
perror("if_indextoname");
995
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
996
"\n", ip, interface, (uintmax_t)port);
612
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
613
ip, interface, port);
999
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1000
ip, (uintmax_t)port);
616
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
1002
619
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1003
620
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1005
ret = getnameinfo((struct sockaddr *)&to,
1006
sizeof(struct sockaddr_in6),
1007
addrstr, sizeof(addrstr), NULL, 0,
1010
ret = getnameinfo((struct sockaddr *)&to,
1011
sizeof(struct sockaddr_in),
1012
addrstr, sizeof(addrstr), NULL, 0,
1015
if(ret == EAI_SYSTEM){
1016
perror_plus("getnameinfo");
1017
} else if(ret != 0) {
1018
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1019
} else if(strcmp(addrstr, ip) != 0){
1020
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1031
ret = connect(tcp_sd, (struct sockaddr *)&to,
1032
sizeof(struct sockaddr_in6));
1034
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1035
sizeof(struct sockaddr_in));
1038
if(errno == ENETUNREACH
1039
and if_index != AVAHI_IF_UNSPEC
1040
and connect_to == NULL
1041
and not route_added and
1042
((af == AF_INET6 and not
1043
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1045
or (af == AF_INET and
1046
/* Not a a IPv4LL address */
1047
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1048
& 0xFFFF0000L) != 0xA9FE0000L))){
1049
/* Work around Avahi bug - Avahi does not announce link-local
1050
addresses if it has a global address, so local hosts with
1051
*only* a link-local address (e.g. Mandos clients) cannot
1052
connect to a Mandos server announced by Avahi on a server
1053
host with a global address. Work around this by retrying
1054
with an explicit route added with the server's address.
1056
Avahi bug reference:
1057
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1058
https://bugs.debian.org/587961
1061
route_added = add_local_route(ip, if_index);
1067
if(errno != ECONNREFUSED or debug){
1069
perror_plus("connect");
623
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
626
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
632
if(strcmp(addrstr, ip) != 0){
633
fprintf(stderr, "Canonical address form: %s\n", addrstr);
639
ret = connect(tcp_sd, &to.in6, sizeof(to));
641
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
1082
648
const char *out = mandos_protocol_version;
1427
891
signal_received = sig;
1428
892
int old_errno = errno;
1429
/* set main loop to exit */
1430
if(simple_poll != NULL){
1431
avahi_simple_poll_quit(simple_poll);
1436
__attribute__((nonnull, warn_unused_result))
1437
bool get_flags(const char *ifname, struct ifreq *ifr){
1441
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1444
perror_plus("socket");
1448
strcpy(ifr->ifr_name, ifname);
1449
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1453
perror_plus("ioctl SIOCGIFFLAGS");
1461
__attribute__((nonnull, warn_unused_result))
1462
bool good_flags(const char *ifname, const struct ifreq *ifr){
1464
/* Reject the loopback device */
1465
if(ifr->ifr_flags & IFF_LOOPBACK){
1467
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1472
/* Accept point-to-point devices only if connect_to is specified */
1473
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1475
fprintf_plus(stderr, "Accepting point-to-point interface"
1476
" \"%s\"\n", ifname);
1480
/* Otherwise, reject non-broadcast-capable devices */
1481
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1483
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1484
" \"%s\"\n", ifname);
1488
/* Reject non-ARP interfaces (including dummy interfaces) */
1489
if(ifr->ifr_flags & IFF_NOARP){
1491
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1497
/* Accept this device */
1499
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1505
* This function determines if a directory entry in /sys/class/net
1506
* corresponds to an acceptable network device.
1507
* (This function is passed to scandir(3) as a filter function.)
1509
__attribute__((nonnull, warn_unused_result))
1510
int good_interface(const struct dirent *if_entry){
1511
if(if_entry->d_name[0] == '.'){
1516
if(not get_flags(if_entry->d_name, &ifr)){
1518
fprintf_plus(stderr, "Failed to get flags for interface "
1519
"\"%s\"\n", if_entry->d_name);
1524
if(not good_flags(if_entry->d_name, &ifr)){
1531
* This function determines if a network interface is up.
1533
__attribute__((nonnull, warn_unused_result))
1534
bool interface_is_up(const char *interface){
1536
if(not get_flags(interface, &ifr)){
1538
fprintf_plus(stderr, "Failed to get flags for interface "
1539
"\"%s\"\n", interface);
1544
return (bool)(ifr.ifr_flags & IFF_UP);
1548
* This function determines if a network interface is running
1550
__attribute__((nonnull, warn_unused_result))
1551
bool interface_is_running(const char *interface){
1553
if(not get_flags(interface, &ifr)){
1555
fprintf_plus(stderr, "Failed to get flags for interface "
1556
"\"%s\"\n", interface);
1561
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1564
__attribute__((nonnull, pure, warn_unused_result))
1565
int notdotentries(const struct dirent *direntry){
1566
/* Skip "." and ".." */
1567
if(direntry->d_name[0] == '.'
1568
and (direntry->d_name[1] == '\0'
1569
or (direntry->d_name[1] == '.'
1570
and direntry->d_name[2] == '\0'))){
1576
/* Is this directory entry a runnable program? */
1577
__attribute__((nonnull, warn_unused_result))
1578
int runnable_hook(const struct dirent *direntry){
1583
if((direntry->d_name)[0] == '\0'){
1588
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1589
"abcdefghijklmnopqrstuvwxyz"
1592
if((direntry->d_name)[sret] != '\0'){
1593
/* Contains non-allowed characters */
1595
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1601
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1604
perror_plus("Could not stat hook");
1608
if(not (S_ISREG(st.st_mode))){
1609
/* Not a regular file */
1611
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1616
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1617
/* Not executable */
1619
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1625
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1631
__attribute__((nonnull, warn_unused_result))
1632
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1633
mandos_context *mc){
1635
struct timespec now;
1636
struct timespec waited_time;
1637
intmax_t block_time;
1640
if(mc->current_server == NULL){
1642
fprintf_plus(stderr, "Wait until first server is found."
1645
ret = avahi_simple_poll_iterate(s, -1);
1648
fprintf_plus(stderr, "Check current_server if we should run"
1651
/* the current time */
1652
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1654
perror_plus("clock_gettime");
1657
/* Calculating in ms how long time between now and server
1658
who we visted longest time ago. Now - last seen. */
1659
waited_time.tv_sec = (now.tv_sec
1660
- mc->current_server->last_seen.tv_sec);
1661
waited_time.tv_nsec = (now.tv_nsec
1662
- mc->current_server->last_seen.tv_nsec);
1663
/* total time is 10s/10,000ms.
1664
Converting to s from ms by dividing by 1,000,
1665
and ns to ms by dividing by 1,000,000. */
1666
block_time = ((retry_interval
1667
- ((intmax_t)waited_time.tv_sec * 1000))
1668
- ((intmax_t)waited_time.tv_nsec / 1000000));
1671
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1675
if(block_time <= 0){
1676
ret = start_mandos_communication(mc->current_server->ip,
1677
mc->current_server->port,
1678
mc->current_server->if_index,
1679
mc->current_server->af, mc);
1681
avahi_simple_poll_quit(s);
1684
ret = clock_gettime(CLOCK_MONOTONIC,
1685
&mc->current_server->last_seen);
1687
perror_plus("clock_gettime");
1690
mc->current_server = mc->current_server->next;
1691
block_time = 0; /* Call avahi to find new Mandos
1692
servers, but don't block */
1695
ret = avahi_simple_poll_iterate(s, (int)block_time);
1698
if(ret > 0 or errno != EINTR){
1699
return (ret != 1) ? ret : 0;
1705
__attribute__((nonnull))
1706
void run_network_hooks(const char *mode, const char *interface,
1708
struct dirent **direntries = NULL;
1709
if(hookdir_fd == -1){
1710
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1712
if(hookdir_fd == -1){
1713
if(errno == ENOENT){
1715
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1716
" found\n", hookdir);
1719
perror_plus("open");
1725
#if __GLIBC_PREREQ(2, 15)
1726
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1727
runnable_hook, alphasort);
1728
#else /* not __GLIBC_PREREQ(2, 15) */
1729
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1731
#endif /* not __GLIBC_PREREQ(2, 15) */
1732
#else /* not __GLIBC__ */
1733
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1735
#endif /* not __GLIBC__ */
1737
perror_plus("scandir");
1740
struct dirent *direntry;
1742
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1744
perror_plus("open(\"/dev/null\", O_RDONLY)");
1747
for(int i = 0; i < numhooks; i++){
1748
direntry = direntries[i];
1750
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1753
pid_t hook_pid = fork();
1756
/* Raise privileges */
1757
errno = raise_privileges_permanently();
1759
perror_plus("Failed to raise privileges");
1766
perror_plus("setgid");
1769
/* Reset supplementary groups */
1771
ret = setgroups(0, NULL);
1773
perror_plus("setgroups");
1776
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1778
perror_plus("setenv");
1781
ret = setenv("DEVICE", interface, 1);
1783
perror_plus("setenv");
1786
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1788
perror_plus("setenv");
1791
ret = setenv("MODE", mode, 1);
1793
perror_plus("setenv");
1797
ret = asprintf(&delaystring, "%f", (double)delay);
1799
perror_plus("asprintf");
1802
ret = setenv("DELAY", delaystring, 1);
1805
perror_plus("setenv");
1809
if(connect_to != NULL){
1810
ret = setenv("CONNECT", connect_to, 1);
1812
perror_plus("setenv");
1816
int hook_fd = TEMP_FAILURE_RETRY(openat(hookdir_fd,
1820
perror_plus("openat");
1821
_exit(EXIT_FAILURE);
1823
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1824
perror_plus("close");
1825
_exit(EXIT_FAILURE);
1827
ret = dup2(devnull, STDIN_FILENO);
1829
perror_plus("dup2(devnull, STDIN_FILENO)");
1832
ret = close(devnull);
1834
perror_plus("close");
1837
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1839
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1842
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1844
perror_plus("fexecve");
1845
_exit(EXIT_FAILURE);
1849
perror_plus("fork");
1854
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1855
perror_plus("waitpid");
1859
if(WIFEXITED(status)){
1860
if(WEXITSTATUS(status) != 0){
1861
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1862
" with status %d\n", direntry->d_name,
1863
WEXITSTATUS(status));
1867
} else if(WIFSIGNALED(status)){
1868
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1869
" signal %d\n", direntry->d_name,
1874
fprintf_plus(stderr, "Warning: network hook \"%s\""
1875
" crashed\n", direntry->d_name);
1881
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1887
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1888
perror_plus("close");
1895
__attribute__((nonnull, warn_unused_result))
1896
error_t bring_up_interface(const char *const interface,
1898
error_t old_errno = errno;
1900
struct ifreq network;
1901
unsigned int if_index = if_nametoindex(interface);
1903
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1913
if(not interface_is_up(interface)){
1914
error_t ret_errno = 0, ioctl_errno = 0;
1915
if(not get_flags(interface, &network)){
1917
fprintf_plus(stderr, "Failed to get flags for interface "
1918
"\"%s\"\n", interface);
1922
network.ifr_flags |= IFF_UP; /* set flag */
1924
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1927
perror_plus("socket");
1933
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1935
perror_plus("close");
1942
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1946
/* Raise privileges */
1947
ret_errno = raise_privileges();
1950
perror_plus("Failed to raise privileges");
1955
bool restore_loglevel = false;
1957
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1958
messages about the network interface to mess up the prompt */
1959
ret_linux = klogctl(8, NULL, 5);
1960
if(ret_linux == -1){
1961
perror_plus("klogctl");
1963
restore_loglevel = true;
1966
#endif /* __linux__ */
1967
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1968
ioctl_errno = errno;
1970
if(restore_loglevel){
1971
ret_linux = klogctl(7, NULL, 0);
1972
if(ret_linux == -1){
1973
perror_plus("klogctl");
1976
#endif /* __linux__ */
1978
/* If raise_privileges() succeeded above */
1980
/* Lower privileges */
1981
ret_errno = lower_privileges();
1984
perror_plus("Failed to lower privileges");
1988
/* Close the socket */
1989
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1991
perror_plus("close");
1994
if(ret_setflags == -1){
1995
errno = ioctl_errno;
1996
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2001
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2005
/* Sleep checking until interface is running.
2006
Check every 0.25s, up to total time of delay */
2007
for(int i=0; i < delay * 4; i++){
2008
if(interface_is_running(interface)){
2011
struct timespec sleeptime = { .tv_nsec = 250000000 };
2012
ret = nanosleep(&sleeptime, NULL);
2013
if(ret == -1 and errno != EINTR){
2014
perror_plus("nanosleep");
2022
__attribute__((nonnull, warn_unused_result))
2023
error_t take_down_interface(const char *const interface){
2024
error_t old_errno = errno;
2025
struct ifreq network;
2026
unsigned int if_index = if_nametoindex(interface);
2028
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2032
if(interface_is_up(interface)){
2033
error_t ret_errno = 0, ioctl_errno = 0;
2034
if(not get_flags(interface, &network) and debug){
2036
fprintf_plus(stderr, "Failed to get flags for interface "
2037
"\"%s\"\n", interface);
2041
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2043
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2046
perror_plus("socket");
2052
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2056
/* Raise privileges */
2057
ret_errno = raise_privileges();
2060
perror_plus("Failed to raise privileges");
2063
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2064
ioctl_errno = errno;
2066
/* If raise_privileges() succeeded above */
2068
/* Lower privileges */
2069
ret_errno = lower_privileges();
2072
perror_plus("Failed to lower privileges");
2076
/* Close the socket */
2077
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2079
perror_plus("close");
2082
if(ret_setflags == -1){
2083
errno = ioctl_errno;
2084
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2089
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
893
if(mc.simple_poll != NULL){
894
avahi_simple_poll_quit(mc.simple_poll);
2097
899
int main(int argc, char *argv[]){
2098
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2099
.priority = "SECURE256:!CTYPE-X.509:"
2100
"+CTYPE-OPENPGP", .current_server = NULL,
2101
.interfaces = NULL, .interfaces_size = 0 };
2102
900
AvahiSServiceBrowser *sb = NULL;
2105
903
intmax_t tmpmax;
2107
905
int exitcode = EXIT_SUCCESS;
2108
char *interfaces_to_take_down = NULL;
2109
size_t interfaces_to_take_down_size = 0;
2110
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2111
char old_tempdir[] = "/tmp/mandosXXXXXX";
2112
char *tempdir = NULL;
906
const char *interface = "eth0";
907
struct ifreq network;
909
bool take_down_interface = false;
912
char *connect_to = NULL;
913
char tempdir[] = "/tmp/mandosXXXXXX";
914
bool tempdir_created = false;
2113
915
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2114
916
const char *seckey = PATHDIR "/" SECKEY;
2115
917
const char *pubkey = PATHDIR "/" PUBKEY;
2116
char *interfaces_hooks = NULL;
2118
919
bool gnutls_initialized = false;
2119
920
bool gpgme_initialized = false;
2120
921
float delay = 2.5f;
2121
double retry_interval = 10; /* 10s between trying a server and
2122
retrying the same server again */
2124
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
923
struct sigaction old_sigterm_action;
2125
924
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2130
/* Lower any group privileges we might have, just to be safe */
2134
perror_plus("setgid");
2137
/* Lower user privileges (temporarily) */
2141
perror_plus("seteuid");
2149
927
struct argp_option options[] = {
2150
928
{ .name = "debug", .key = 128,
2239
996
delay = strtof(arg, &tmp);
2240
997
if(errno != 0 or tmp == arg or *tmp != '\0'){
2241
argp_error(state, "Bad delay");
2243
case 132: /* --retry */
2245
retry_interval = strtod(arg, &tmp);
2246
if(errno != 0 or tmp == arg or *tmp != '\0'
2247
or (retry_interval * 1000) > INT_MAX
2248
or retry_interval < 0){
2249
argp_error(state, "Bad retry interval");
2252
case 133: /* --network-hook-dir */
2256
* These reproduce what we would get without ARGP_NO_HELP
2258
case '?': /* --help */
2259
argp_state_help(state, state->out_stream,
2260
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2261
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2262
case -3: /* --usage */
2263
argp_state_help(state, state->out_stream,
2264
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2265
case 'V': /* --version */
2266
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2267
exit(argp_err_exit_status);
998
fprintf(stderr, "Bad delay\n");
2270
1007
return ARGP_ERR_UNKNOWN;
2275
1012
struct argp argp = { .options = options, .parser = parse_opt,
2276
1013
.args_doc = "",
2277
1014
.doc = "Mandos client -- Get and decrypt"
2278
1015
" passwords from a Mandos server" };
2279
ret = argp_parse(&argp, argc, argv,
2280
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2287
perror_plus("argp_parse");
2288
exitcode = EX_OSERR;
2291
exitcode = EX_USAGE;
2297
/* Work around Debian bug #633582:
2298
<http://bugs.debian.org/633582> */
2300
/* Re-raise privileges */
2301
ret_errno = raise_privileges();
2304
perror_plus("Failed to raise privileges");
2308
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2309
int seckey_fd = open(seckey, O_RDONLY);
2310
if(seckey_fd == -1){
2311
perror_plus("open");
2313
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2315
perror_plus("fstat");
2317
if(S_ISREG(st.st_mode)
2318
and st.st_uid == 0 and st.st_gid == 0){
2319
ret = fchown(seckey_fd, uid, gid);
2321
perror_plus("fchown");
2325
TEMP_FAILURE_RETRY(close(seckey_fd));
2329
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2330
int pubkey_fd = open(pubkey, O_RDONLY);
2331
if(pubkey_fd == -1){
2332
perror_plus("open");
2334
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2336
perror_plus("fstat");
2338
if(S_ISREG(st.st_mode)
2339
and st.st_uid == 0 and st.st_gid == 0){
2340
ret = fchown(pubkey_fd, uid, gid);
2342
perror_plus("fchown");
2346
TEMP_FAILURE_RETRY(close(pubkey_fd));
2350
/* Lower privileges */
2351
ret_errno = lower_privileges();
2354
perror_plus("Failed to lower privileges");
2359
/* Remove invalid interface names (except "none") */
2361
char *interface = NULL;
2362
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2364
if(strcmp(interface, "none") != 0
2365
and if_nametoindex(interface) == 0){
2366
if(interface[0] != '\0'){
2367
fprintf_plus(stderr, "Not using nonexisting interface"
2368
" \"%s\"\n", interface);
2370
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2376
/* Run network hooks */
2378
if(mc.interfaces != NULL){
2379
interfaces_hooks = malloc(mc.interfaces_size);
2380
if(interfaces_hooks == NULL){
2381
perror_plus("malloc");
2384
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2385
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2387
run_network_hooks("start", interfaces_hooks != NULL ?
2388
interfaces_hooks : "", delay);
1016
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1017
if(ret == ARGP_ERR_UNKNOWN){
1018
fprintf(stderr, "Unknown error while parsing arguments\n");
1019
exitcode = EXIT_FAILURE;
2396
1029
from the signal handler */
2397
1030
/* Initialize the pseudo-RNG for Avahi */
2398
1031
srand((unsigned int) time(NULL));
2399
simple_poll = avahi_simple_poll_new();
2400
if(simple_poll == NULL){
2401
fprintf_plus(stderr,
2402
"Avahi: Failed to create simple poll object.\n");
2403
exitcode = EX_UNAVAILABLE;
1032
mc.simple_poll = avahi_simple_poll_new();
1033
if(mc.simple_poll == NULL){
1034
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1035
exitcode = EXIT_FAILURE;
2407
1039
sigemptyset(&sigterm_action.sa_mask);
2408
1040
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2410
perror_plus("sigaddset");
2411
exitcode = EX_OSERR;
1042
perror("sigaddset");
1043
exitcode = EXIT_FAILURE;
2414
1046
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2416
perror_plus("sigaddset");
2417
exitcode = EX_OSERR;
1048
perror("sigaddset");
1049
exitcode = EXIT_FAILURE;
2420
1052
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2422
perror_plus("sigaddset");
2423
exitcode = EX_OSERR;
2426
/* Need to check if the handler is SIG_IGN before handling:
2427
| [[info:libc:Initial Signal Actions]] |
2428
| [[info:libc:Basic Signal Handling]] |
2430
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2432
perror_plus("sigaction");
2435
if(old_sigterm_action.sa_handler != SIG_IGN){
2436
ret = sigaction(SIGINT, &sigterm_action, NULL);
2438
perror_plus("sigaction");
2439
exitcode = EX_OSERR;
2443
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2445
perror_plus("sigaction");
2448
if(old_sigterm_action.sa_handler != SIG_IGN){
2449
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2451
perror_plus("sigaction");
2452
exitcode = EX_OSERR;
2456
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2458
perror_plus("sigaction");
2461
if(old_sigterm_action.sa_handler != SIG_IGN){
2462
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2464
perror_plus("sigaction");
2465
exitcode = EX_OSERR;
2470
/* If no interfaces were specified, make a list */
2471
if(mc.interfaces == NULL){
2472
struct dirent **direntries = NULL;
2473
/* Look for any good interfaces */
2474
ret = scandir(sys_class_net, &direntries, good_interface,
2477
/* Add all found interfaces to interfaces list */
2478
for(int i = 0; i < ret; ++i){
2479
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2480
direntries[i]->d_name);
2483
perror_plus("argz_add");
2484
free(direntries[i]);
2488
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2489
direntries[i]->d_name);
2491
free(direntries[i]);
2498
fprintf_plus(stderr, "Could not find a network interface\n");
2499
exitcode = EXIT_FAILURE;
2504
/* Bring up interfaces which are down, and remove any "none"s */
2506
char *interface = NULL;
2507
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2509
/* If interface name is "none", stop bringing up interfaces.
2510
Also remove all instances of "none" from the list */
2511
if(strcmp(interface, "none") == 0){
2512
argz_delete(&mc.interfaces, &mc.interfaces_size,
2515
while((interface = argz_next(mc.interfaces,
2516
mc.interfaces_size, interface))){
2517
if(strcmp(interface, "none") == 0){
2518
argz_delete(&mc.interfaces, &mc.interfaces_size,
1054
perror("sigaddset");
1055
exitcode = EXIT_FAILURE;
1058
ret = sigaction(SIGINT, &sigterm_action, &old_sigterm_action);
1060
perror("sigaction");
1061
exitcode = EXIT_FAILURE;
1064
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1066
perror("sigaction");
1067
exitcode = EXIT_FAILURE;
1070
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1072
perror("sigaction");
1073
exitcode = EXIT_FAILURE;
1077
/* If the interface is down, bring it up */
1078
if(interface[0] != '\0'){
1079
if_index = (AvahiIfIndex) if_nametoindex(interface);
1081
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1082
exitcode = EXIT_FAILURE;
1091
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1092
messages to mess up the prompt */
1093
ret = klogctl(8, NULL, 5);
1094
bool restore_loglevel = true;
1096
restore_loglevel = false;
1099
#endif /* __linux__ */
1101
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1104
exitcode = EXIT_FAILURE;
1106
if(restore_loglevel){
1107
ret = klogctl(7, NULL, 0);
1112
#endif /* __linux__ */
1115
strcpy(network.ifr_name, interface);
1116
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1118
perror("ioctl SIOCGIFFLAGS");
1120
if(restore_loglevel){
1121
ret = klogctl(7, NULL, 0);
1126
#endif /* __linux__ */
1127
exitcode = EXIT_FAILURE;
1130
if((network.ifr_flags & IFF_UP) == 0){
1131
network.ifr_flags |= IFF_UP;
1132
take_down_interface = true;
1133
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1135
take_down_interface = false;
1136
perror("ioctl SIOCSIFFLAGS");
1137
exitcode = EXIT_FAILURE;
1139
if(restore_loglevel){
1140
ret = klogctl(7, NULL, 0);
1145
#endif /* __linux__ */
1149
/* sleep checking until interface is running */
1150
for(int i=0; i < delay * 4; i++){
1151
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1153
perror("ioctl SIOCGIFFLAGS");
1154
} else if(network.ifr_flags & IFF_RUNNING){
2525
bool interface_was_up = interface_is_up(interface);
2526
errno = bring_up_interface(interface, delay);
2527
if(not interface_was_up){
2529
perror_plus("Failed to bring up interface");
2531
errno = argz_add(&interfaces_to_take_down,
2532
&interfaces_to_take_down_size,
2535
perror_plus("argz_add");
2540
if(debug and (interfaces_to_take_down == NULL)){
2541
fprintf_plus(stderr, "No interfaces were brought up\n");
2545
/* If we only got one interface, explicitly use only that one */
2546
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2548
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2551
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2558
ret = init_gnutls_global(pubkey, seckey, &mc);
2560
fprintf_plus(stderr, "init_gnutls_global failed\n");
2561
exitcode = EX_UNAVAILABLE;
1157
struct timespec sleeptime = { .tv_nsec = 250000000 };
1158
ret = nanosleep(&sleeptime, NULL);
1159
if(ret == -1 and errno != EINTR){
1160
perror("nanosleep");
1163
if(not take_down_interface){
1164
/* We won't need the socket anymore */
1165
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1171
if(restore_loglevel){
1172
/* Restores kernel loglevel to default */
1173
ret = klogctl(7, NULL, 0);
1178
#endif /* __linux__ */
1203
ret = init_gnutls_global(pubkey, seckey);
1205
fprintf(stderr, "init_gnutls_global failed\n");
1206
exitcode = EXIT_FAILURE;
2564
1209
gnutls_initialized = true;
2758
1371
gpgme_release(mc.ctx);
2761
/* Cleans up the circular linked list of Mandos servers the client
2763
if(mc.current_server != NULL){
2764
mc.current_server->prev->next = NULL;
2765
while(mc.current_server != NULL){
2766
server *next = mc.current_server->next;
2768
#pragma GCC diagnostic push
2769
#pragma GCC diagnostic ignored "-Wcast-qual"
2771
free((char *)(mc.current_server->ip));
2773
#pragma GCC diagnostic pop
2775
free(mc.current_server);
2776
mc.current_server = next;
2780
/* Re-raise privileges */
2782
ret_errno = raise_privileges();
2785
perror_plus("Failed to raise privileges");
2788
/* Run network hooks */
2789
run_network_hooks("stop", interfaces_hooks != NULL ?
2790
interfaces_hooks : "", delay);
2792
/* Take down the network interfaces which were brought up */
2794
char *interface = NULL;
2795
while((interface=argz_next(interfaces_to_take_down,
2796
interfaces_to_take_down_size,
2798
ret_errno = take_down_interface(interface);
2801
perror_plus("Failed to take down interface");
2804
if(debug and (interfaces_to_take_down == NULL)){
2805
fprintf_plus(stderr, "No interfaces needed to be taken"
2811
ret_errno = lower_privileges_permanently();
2814
perror_plus("Failed to lower privileges permanently");
2818
free(interfaces_to_take_down);
2819
free(interfaces_hooks);
2821
/* Removes the GPGME temp directory and all files inside */
2822
if(tempdir != NULL){
2823
struct dirent **direntries = NULL;
2824
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2828
if(tempdir_fd == -1){
2829
perror_plus("open");
2832
#if __GLIBC_PREREQ(2, 15)
2833
int numentries = scandirat(tempdir_fd, ".", &direntries,
2834
notdotentries, alphasort);
2835
#else /* not __GLIBC_PREREQ(2, 15) */
2836
int numentries = scandir(tempdir, &direntries, notdotentries,
2838
#endif /* not __GLIBC_PREREQ(2, 15) */
2839
#else /* not __GLIBC__ */
2840
int numentries = scandir(tempdir, &direntries, notdotentries,
2842
#endif /* not __GLIBC__ */
2843
if(numentries >= 0){
2844
for(int i = 0; i < numentries; i++){
2845
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2847
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2848
" \"%s\", 0): %s\n", tempdir,
2849
direntries[i]->d_name, strerror(errno));
2851
free(direntries[i]);
2854
/* need to clean even if 0 because man page doesn't specify */
2856
if(numentries == -1){
2857
perror_plus("scandir");
2859
ret = rmdir(tempdir);
2860
if(ret == -1 and errno != ENOENT){
2861
perror_plus("rmdir");
2864
TEMP_FAILURE_RETRY(close(tempdir_fd));
1374
/* Take down the network interface */
1375
if(take_down_interface){
1376
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1378
perror("ioctl SIOCGIFFLAGS");
1379
} else if(network.ifr_flags & IFF_UP) {
1380
network.ifr_flags &= ~IFF_UP; /* clear flag */
1381
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1383
perror("ioctl SIOCSIFFLAGS");
1386
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1392
/* Removes the temp directory used by GPGME */
1393
if(tempdir_created){
1395
struct dirent *direntry;
1396
d = opendir(tempdir);
1398
if(errno != ENOENT){
1403
direntry = readdir(d);
1404
if(direntry == NULL){
1407
/* Skip "." and ".." */
1408
if(direntry->d_name[0] == '.'
1409
and (direntry->d_name[1] == '\0'
1410
or (direntry->d_name[1] == '.'
1411
and direntry->d_name[2] == '\0'))){
1414
char *fullname = NULL;
1415
ret = asprintf(&fullname, "%s/%s", tempdir,
1421
ret = remove(fullname);
1423
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1430
ret = rmdir(tempdir);
1431
if(ret == -1 and errno != ENOENT){
2869
sigemptyset(&old_sigterm_action.sa_mask);
2870
old_sigterm_action.sa_handler = SIG_DFL;
2871
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2872
&old_sigterm_action,
1437
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2875
perror_plus("sigaction");
2878
ret = raise(signal_received);
2879
} while(ret != 0 and errno == EINTR);
2881
perror_plus("raise");
2884
TEMP_FAILURE_RETRY(pause());
1439
perror("sigaction");
1441
raise(signal_received);
2887
1444
return exitcode;