32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
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46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
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53
sockaddr_in6, PF_INET6,
156
170
const char *priority;
158
172
server *current_server;
174
size_t interfaces_size;
159
175
} 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 };
177
/* global so signal handler can reach it*/
178
AvahiSimplePoll *simple_poll;
167
180
sig_atomic_t quit_now = 0;
168
181
int signal_received = 0;
170
183
/* Function to use when printing errors */
171
184
void perror_plus(const char *print_text){
172
186
fprintf(stderr, "Mandos plugin %s: ",
173
187
program_invocation_short_name);
174
189
perror(print_text);
192
__attribute__((format (gnu_printf, 2, 3), nonnull))
193
int fprintf_plus(FILE *stream, const char *format, ...){
195
va_start (ap, format);
197
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
198
program_invocation_short_name));
199
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
178
203
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
204
* bytes. "buffer_capacity" is how much is currently allocated,
180
205
* "buffer_length" is how much is already used.
207
__attribute__((nonnull, warn_unused_result))
182
208
size_t incbuffer(char **buffer, size_t buffer_length,
183
209
size_t buffer_capacity){
184
210
if(buffer_length + BUFFER_SIZE > buffer_capacity){
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
211
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
int old_errno = errno;
189
220
buffer_capacity += BUFFER_SIZE;
191
222
return buffer_capacity;
194
225
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
226
__attribute__((nonnull, warn_unused_result))
227
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
228
int af, server **current_server){
198
230
server *new_server = malloc(sizeof(server));
199
231
if(new_server == NULL){
200
232
perror_plus("malloc");
203
235
*new_server = (server){ .ip = strdup(ip),
207
239
if(new_server->ip == NULL){
208
240
perror_plus("strdup");
244
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
246
perror_plus("clock_gettime");
248
#pragma GCC diagnostic push
249
#pragma GCC diagnostic ignored "-Wcast-qual"
251
free((char *)(new_server->ip));
253
#pragma GCC diagnostic pop
211
258
/* Special case of first server */
212
if (mc.current_server == NULL){
259
if(*current_server == NULL){
213
260
new_server->next = new_server;
214
261
new_server->prev = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
262
*current_server = new_server;
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
264
/* Place the new server last in the list */
265
new_server->next = *current_server;
266
new_server->prev = (*current_server)->prev;
220
267
new_server->prev->next = new_server;
221
mc.current_server->prev = new_server;
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
225
perror_plus("clock_gettime");
268
(*current_server)->prev = new_server;
232
274
* Initialize GPGME.
234
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
276
__attribute__((nonnull, warn_unused_result))
277
static bool init_gpgme(const char * const seckey,
278
const char * const pubkey,
279
const char * const tempdir,
236
281
gpgme_error_t rc;
237
282
gpgme_engine_info_t engine_info;
241
285
* Helper function to insert pub and seckey to the engine keyring.
243
bool import_key(const char *filename){
287
bool import_key(const char * const filename){
246
290
gpgme_data_t pgp_data;
342
383
ssize_t plaintext_length = 0;
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
386
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
349
389
/* Create new GPGME data buffer from memory cryptotext */
350
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rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
352
392
if(rc != GPG_ERR_NO_ERROR){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
355
gpgme_strsource(rc), gpgme_strerror(rc));
393
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
394
gpgme_strsource(rc), gpgme_strerror(rc));
359
398
/* Create new empty GPGME data buffer for the plaintext */
360
399
rc = gpgme_data_new(&dh_plain);
361
400
if(rc != GPG_ERR_NO_ERROR){
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
401
fprintf_plus(stderr, "Mandos plugin mandos-client: "
402
"bad gpgme_data_new: %s: %s\n",
403
gpgme_strsource(rc), gpgme_strerror(rc));
365
404
gpgme_data_release(dh_crypto);
369
408
/* Decrypt data from the cryptotext data buffer to the plaintext
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
410
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
372
411
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
412
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
413
gpgme_strsource(rc), gpgme_strerror(rc));
376
414
plaintext_length = -1;
378
416
gpgme_decrypt_result_t result;
379
result = gpgme_op_decrypt_result(mc.ctx);
417
result = gpgme_op_decrypt_result(mc->ctx);
380
418
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
419
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
389
result->wrong_key_usage);
421
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
422
result->unsupported_algorithm);
423
fprintf_plus(stderr, "Wrong key usage: %u\n",
424
result->wrong_key_usage);
390
425
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
426
fprintf_plus(stderr, "File name: %s\n", result->file_name);
394
428
gpgme_recipient_t recipient;
395
429
recipient = result->recipients;
396
430
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
431
fprintf_plus(stderr, "Public key algorithm: %s\n",
432
gpgme_pubkey_algo_name
433
(recipient->pubkey_algo));
434
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
435
fprintf_plus(stderr, "Secret key available: %s\n",
436
recipient->status == GPG_ERR_NO_SECKEY
406
438
recipient = recipient->next;
467
497
return plaintext_length;
470
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value); /* Spurious warning from
472
-Wunreachable-code */
500
__attribute__((warn_unused_result, const))
501
static const char *safe_string(const char *str){
507
__attribute__((warn_unused_result))
508
static const char *safer_gnutls_strerror(int value){
509
const char *ret = gnutls_strerror(value);
510
return safe_string(ret);
478
513
/* GnuTLS log function callback */
514
__attribute__((nonnull))
479
515
static void debuggnutls(__attribute__((unused)) int level,
480
516
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
517
fprintf_plus(stderr, "GnuTLS: %s", string);
520
__attribute__((nonnull(1, 2, 4), warn_unused_result))
484
521
static int init_gnutls_global(const char *pubkeyfilename,
485
const char *seckeyfilename){
522
const char *seckeyfilename,
523
const char *dhparamsfilename,
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
493
ret = gnutls_global_init();
494
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
529
fprintf_plus(stderr, "Initializing GnuTLS\n");
508
540
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
541
ret = gnutls_certificate_allocate_credentials(&mc->cred);
510
542
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
513
gnutls_global_deinit();
543
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
544
safer_gnutls_strerror(ret));
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
549
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
550
" secret key %s as GnuTLS credentials\n",
524
555
ret = gnutls_certificate_set_openpgp_key_file
525
(mc.cred, pubkeyfilename, seckeyfilename,
556
(mc->cred, pubkeyfilename, seckeyfilename,
526
557
GNUTLS_OPENPGP_FMT_BASE64);
527
558
if(ret != GNUTLS_E_SUCCESS){
529
"Mandos plugin mandos-client: "
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
560
"Error[%d] while reading the OpenPGP key pair ('%s',"
561
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
562
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
563
safer_gnutls_strerror(ret));
537
567
/* GnuTLS server initialization */
538
ret = gnutls_dh_params_init(&mc.dh_params);
539
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
542
" %s\n", safer_gnutls_strerror(ret));
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
546
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
568
ret = gnutls_dh_params_init(&mc->dh_params);
569
if(ret != GNUTLS_E_SUCCESS){
570
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
571
" initialization: %s\n",
572
safer_gnutls_strerror(ret));
575
/* If a Diffie-Hellman parameters file was given, try to use it */
576
if(dhparamsfilename != NULL){
577
gnutls_datum_t params = { .data = NULL, .size = 0 };
579
int dhpfile = open(dhparamsfilename, O_RDONLY);
582
dhparamsfilename = NULL;
585
size_t params_capacity = 0;
587
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params_capacity);
590
if(params_capacity == 0){
591
perror_plus("incbuffer");
594
dhparamsfilename = NULL;
597
ssize_t bytes_read = read(dhpfile,
598
params.data + params.size,
604
/* check bytes_read for failure */
609
dhparamsfilename = NULL;
612
params.size += (unsigned int)bytes_read;
614
if(params.data == NULL){
615
dhparamsfilename = NULL;
617
if(dhparamsfilename == NULL){
620
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
621
GNUTLS_X509_FMT_PEM);
622
if(ret != GNUTLS_E_SUCCESS){
623
fprintf_plus(stderr, "Failed to parse DH parameters in file"
624
" \"%s\": %s\n", dhparamsfilename,
625
safer_gnutls_strerror(ret));
626
dhparamsfilename = NULL;
630
if(dhparamsfilename == NULL){
631
if(mc->dh_bits == 0){
632
/* Find out the optimal number of DH bits */
633
/* Try to read the private key file */
634
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
636
int secfile = open(seckeyfilename, O_RDONLY);
641
size_t buffer_capacity = 0;
643
buffer_capacity = incbuffer((char **)&buffer.data,
645
(size_t)buffer_capacity);
646
if(buffer_capacity == 0){
647
perror_plus("incbuffer");
652
ssize_t bytes_read = read(secfile,
653
buffer.data + buffer.size,
659
/* check bytes_read for failure */
666
buffer.size += (unsigned int)bytes_read;
670
/* If successful, use buffer to parse private key */
671
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
672
if(buffer.data != NULL){
674
gnutls_openpgp_privkey_t privkey = NULL;
675
ret = gnutls_openpgp_privkey_init(&privkey);
676
if(ret != GNUTLS_E_SUCCESS){
677
fprintf_plus(stderr, "Error initializing OpenPGP key"
679
safer_gnutls_strerror(ret));
683
ret = gnutls_openpgp_privkey_import
684
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
687
safer_gnutls_strerror(ret));
693
/* Use private key to suggest an appropriate
695
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
696
gnutls_openpgp_privkey_deinit(privkey);
698
fprintf_plus(stderr, "This OpenPGP key implies using"
699
" a GnuTLS security parameter \"%s\".\n",
700
safe_string(gnutls_sec_param_get_name
706
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
707
/* Err on the side of caution */
708
sec_param = GNUTLS_SEC_PARAM_ULTRA;
710
fprintf_plus(stderr, "Falling back to security parameter"
712
safe_string(gnutls_sec_param_get_name
717
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
721
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
722
" implies %u DH bits; using that.\n",
723
safe_string(gnutls_sec_param_get_name
728
fprintf_plus(stderr, "Failed to get implied number of DH"
729
" bits for security parameter \"%s\"): %s\n",
730
safe_string(gnutls_sec_param_get_name
732
safer_gnutls_strerror(ret));
736
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
739
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
740
if(ret != GNUTLS_E_SUCCESS){
741
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
742
" bits): %s\n", mc->dh_bits,
743
safer_gnutls_strerror(ret));
747
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
559
gnutls_certificate_free_credentials(mc.cred);
560
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
753
gnutls_certificate_free_credentials(mc->cred);
754
gnutls_dh_params_deinit(mc->dh_params);
565
static int init_gnutls_session(gnutls_session_t *session){
758
__attribute__((nonnull, warn_unused_result))
759
static int init_gnutls_session(gnutls_session_t *session,
567
762
/* GnuTLS session creation */
624
815
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
625
816
__attribute__((unused)) const char *txt){}
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
error_t raise_privileges(void){
821
error_t old_errno = errno;
822
error_t ret_errno = 0;
823
if(seteuid(0) == -1){
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
error_t raise_privileges_permanently(void){
833
error_t old_errno = errno;
834
error_t ret_errno = raise_privileges();
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
error_t lower_privileges(void){
849
error_t old_errno = errno;
850
error_t ret_errno = 0;
851
if(seteuid(uid) == -1){
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
error_t lower_privileges_permanently(void){
861
error_t old_errno = errno;
862
error_t ret_errno = 0;
863
if(setuid(uid) == -1){
870
/* Helper function to add_local_route() and delete_local_route() */
871
__attribute__((nonnull, warn_unused_result))
872
static bool add_delete_local_route(const bool add,
874
AvahiIfIndex if_index){
876
char helper[] = "mandos-client-iprouteadddel";
877
char add_arg[] = "add";
878
char delete_arg[] = "delete";
879
char debug_flag[] = "--debug";
880
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
881
if(pluginhelperdir == NULL){
883
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
884
" variable not set; cannot run helper\n");
889
char interface[IF_NAMESIZE];
890
if(if_indextoname((unsigned int)if_index, interface) == NULL){
891
perror_plus("if_indextoname");
895
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
897
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
/* Raise privileges */
904
errno = raise_privileges_permanently();
906
perror_plus("Failed to raise privileges");
907
/* _exit(EX_NOPERM); */
913
perror_plus("setgid");
916
/* Reset supplementary groups */
918
ret = setgroups(0, NULL);
920
perror_plus("setgroups");
924
ret = dup2(devnull, STDIN_FILENO);
926
perror_plus("dup2(devnull, STDIN_FILENO)");
929
ret = close(devnull);
931
perror_plus("close");
934
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
936
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
939
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
944
if(helperdir_fd == -1){
946
_exit(EX_UNAVAILABLE);
948
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
951
perror_plus("openat");
953
_exit(EX_UNAVAILABLE);
957
#pragma GCC diagnostic push
958
#pragma GCC diagnostic ignored "-Wcast-qual"
960
if(fexecve(helper_fd, (char *const [])
961
{ helper, add ? add_arg : delete_arg, (char *)address,
962
interface, debug ? debug_flag : NULL, NULL },
965
#pragma GCC diagnostic pop
967
perror_plus("fexecve");
979
pret = waitpid(pid, &status, 0);
980
if(pret == -1 and errno == EINTR and quit_now){
981
int errno_raising = 0;
982
if((errno = raise_privileges()) != 0){
983
errno_raising = errno;
984
perror_plus("Failed to raise privileges in order to"
985
" kill helper program");
987
if(kill(pid, SIGTERM) == -1){
990
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
991
perror_plus("Failed to lower privileges after killing"
996
} while(pret == -1 and errno == EINTR);
998
perror_plus("waitpid");
1001
if(WIFEXITED(status)){
1002
if(WEXITSTATUS(status) != 0){
1003
fprintf_plus(stderr, "Error: iprouteadddel exited"
1004
" with status %d\n", WEXITSTATUS(status));
1009
if(WIFSIGNALED(status)){
1010
fprintf_plus(stderr, "Error: iprouteadddel died by"
1011
" signal %d\n", WTERMSIG(status));
1014
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1018
__attribute__((nonnull, warn_unused_result))
1019
static bool add_local_route(const char *address,
1020
AvahiIfIndex if_index){
1022
fprintf_plus(stderr, "Adding route to %s\n", address);
1024
return add_delete_local_route(true, address, if_index);
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool delete_local_route(const char *address,
1029
AvahiIfIndex if_index){
1031
fprintf_plus(stderr, "Removing route to %s\n", address);
1033
return add_delete_local_route(false, address, if_index);
627
1036
/* Called when a Mandos server is found */
628
static int start_mandos_communication(const char *ip, uint16_t port,
1037
__attribute__((nonnull, warn_unused_result))
1038
static int start_mandos_communication(const char *ip, in_port_t port,
629
1039
AvahiIfIndex if_index,
1040
int af, mandos_context *mc){
631
1041
int ret, tcp_sd = -1;
634
struct sockaddr_in in;
635
struct sockaddr_in6 in6;
1043
struct sockaddr_storage to;
637
1044
char *buffer = NULL;
638
1045
char *decrypted_buffer = NULL;
639
1046
size_t buffer_length = 0;
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
1069
fprintf_plus(stderr, "Bad address family: %d\n", af);
667
ret = init_gnutls_session(&session);
1074
/* If the interface is specified and we have a list of interfaces */
1075
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1076
/* Check if the interface is one of the interfaces we are using */
1079
char *interface = NULL;
1080
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1082
if(if_nametoindex(interface) == (unsigned int)if_index){
1089
/* This interface does not match any in the list, so we don't
1090
connect to the server */
1092
char interface[IF_NAMESIZE];
1093
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1094
perror_plus("if_indextoname");
1096
fprintf_plus(stderr, "Skipping server on non-used interface"
1098
if_indextoname((unsigned int)if_index,
1106
ret = init_gnutls_session(&session, mc);
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
1112
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1113
PRIuMAX "\n", ip, (uintmax_t)port);
678
tcp_sd = socket(pf, SOCK_STREAM, 0);
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
681
1119
perror_plus("socket");
744
1175
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
1176
perror_plus("if_indextoname");
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
1178
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1179
"\n", ip, interface, (uintmax_t)port);
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
1182
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1183
ip, (uintmax_t)port);
755
1185
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
1186
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
759
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
762
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
766
perror_plus("inet_ntop");
768
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
781
ret = connect(tcp_sd, &to.in6, sizeof(to));
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
788
perror_plus("connect");
1188
ret = getnameinfo((struct sockaddr *)&to,
1189
sizeof(struct sockaddr_in6),
1190
addrstr, sizeof(addrstr), NULL, 0,
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in),
1195
addrstr, sizeof(addrstr), NULL, 0,
1198
if(ret == EAI_SYSTEM){
1199
perror_plus("getnameinfo");
1200
} else if(ret != 0) {
1201
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1202
} else if(strcmp(addrstr, ip) != 0){
1203
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1214
ret = connect(tcp_sd, (struct sockaddr *)&to,
1215
sizeof(struct sockaddr_in6));
1217
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1218
sizeof(struct sockaddr_in));
1221
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1222
and if_index != AVAHI_IF_UNSPEC
1223
and connect_to == NULL
1224
and not route_added and
1225
((af == AF_INET6 and not
1226
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1228
or (af == AF_INET and
1229
/* Not a a IPv4LL address */
1230
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1231
& 0xFFFF0000L) != 0xA9FE0000L))){
1232
/* Work around Avahi bug - Avahi does not announce link-local
1233
addresses if it has a global address, so local hosts with
1234
*only* a link-local address (e.g. Mandos clients) cannot
1235
connect to a Mandos server announced by Avahi on a server
1236
host with a global address. Work around this by retrying
1237
with an explicit route added with the server's address.
1239
Avahi bug reference:
1240
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1241
https://bugs.debian.org/587961
1244
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
route_added = add_local_route(ip, if_index);
1254
if(errno != ECONNREFUSED or debug){
1256
perror_plus("connect");
799
1269
const char *out = mandos_protocol_version;
1043
1522
char ip[AVAHI_ADDRESS_STR_MAX];
1044
1523
avahi_address_snprint(ip, sizeof(ip), address);
1046
fprintf(stderr, "Mandos plugin mandos-client: "
1047
"Mandos server \"%s\" found on %s (%s, %"
1048
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1049
ip, (intmax_t)interface, port);
1525
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1526
PRIdMAX ") on port %" PRIu16 "\n", name,
1527
host_name, ip, (intmax_t)interface, port);
1051
int ret = start_mandos_communication(ip, port, interface,
1052
avahi_proto_to_af(proto));
1529
int ret = start_mandos_communication(ip, (in_port_t)port,
1531
avahi_proto_to_af(proto),
1054
avahi_simple_poll_quit(mc.simple_poll);
1534
avahi_simple_poll_quit(simple_poll);
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
1536
if(not add_server(ip, (in_port_t)port, interface,
1537
avahi_proto_to_af(proto),
1538
&((mandos_context*)mc)->current_server)){
1539
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1126
1614
signal_received = sig;
1127
1615
int old_errno = errno;
1128
1616
/* set main loop to exit */
1129
if(mc.simple_poll != NULL){
1130
avahi_simple_poll_quit(mc.simple_poll);
1617
if(simple_poll != NULL){
1618
avahi_simple_poll_quit(simple_poll);
1132
1620
errno = old_errno;
1623
__attribute__((nonnull, warn_unused_result))
1135
1624
bool get_flags(const char *ifname, struct ifreq *ifr){
1138
1628
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1140
1631
perror_plus("socket");
1143
strcpy(ifr->ifr_name, ifname);
1635
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1636
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1144
1637
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1147
1641
perror_plus("ioctl SIOCGIFFLAGS");
1649
__attribute__((nonnull, warn_unused_result))
1154
1650
bool good_flags(const char *ifname, const struct ifreq *ifr){
1156
1652
/* Reject the loopback device */
1157
1653
if(ifr->ifr_flags & IFF_LOOPBACK){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1655
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1164
1660
/* Accept point-to-point devices only if connect_to is specified */
1165
1661
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1663
fprintf_plus(stderr, "Accepting point-to-point interface"
1664
" \"%s\"\n", ifname);
1172
1668
/* Otherwise, reject non-broadcast-capable devices */
1173
1669
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1671
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1672
" \"%s\"\n", ifname);
1180
1676
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
1677
if(ifr->ifr_flags & IFF_NOARP){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1679
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1189
1685
/* Accept this device */
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1687
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1207
1703
struct ifreq ifr;
1208
1704
if(not get_flags(if_entry->d_name, &ifr)){
1210
fprintf(stderr, "Mandos plugin mandos-client: "
1211
"Failed to get flags for interface \"%s\"\n",
1217
if(not good_flags(if_entry->d_name, &ifr)){
1224
* This function determines if a directory entry in /sys/class/net
1225
* corresponds to an acceptable network device which is up.
1226
* (This function is passed to scandir(3) as a filter function.)
1228
int up_interface(const struct dirent *if_entry){
1229
if(if_entry->d_name[0] == '.'){
1234
if(not get_flags(if_entry->d_name, &ifr)){
1236
fprintf(stderr, "Mandos plugin mandos-client: "
1237
"Failed to get flags for interface \"%s\"\n",
1243
/* Reject down interfaces */
1244
if(not (ifr.ifr_flags & IFF_UP)){
1246
fprintf(stderr, "Mandos plugin mandos-client: "
1247
"Rejecting down interface \"%s\"\n",
1253
/* Reject non-running interfaces */
1254
if(not (ifr.ifr_flags & IFF_RUNNING)){
1256
fprintf(stderr, "Mandos plugin mandos-client: "
1257
"Rejecting non-running interface \"%s\"\n",
1263
if(not good_flags(if_entry->d_name, &ifr)){
1706
fprintf_plus(stderr, "Failed to get flags for interface "
1707
"\"%s\"\n", if_entry->d_name);
1712
if(not good_flags(if_entry->d_name, &ifr)){
1719
* This function determines if a network interface is up.
1721
__attribute__((nonnull, warn_unused_result))
1722
bool interface_is_up(const char *interface){
1724
if(not get_flags(interface, &ifr)){
1726
fprintf_plus(stderr, "Failed to get flags for interface "
1727
"\"%s\"\n", interface);
1732
return (bool)(ifr.ifr_flags & IFF_UP);
1736
* This function determines if a network interface is running
1738
__attribute__((nonnull, warn_unused_result))
1739
bool interface_is_running(const char *interface){
1741
if(not get_flags(interface, &ifr)){
1743
fprintf_plus(stderr, "Failed to get flags for interface "
1744
"\"%s\"\n", interface);
1749
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1752
__attribute__((nonnull, pure, warn_unused_result))
1269
1753
int notdotentries(const struct dirent *direntry){
1270
1754
/* Skip "." and ".." */
1271
1755
if(direntry->d_name[0] == '.'
1319
1796
if(not (S_ISREG(st.st_mode))){
1320
1797
/* Not a regular file */
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1799
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1328
1804
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1329
1805
/* Not executable */
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1807
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1813
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1819
__attribute__((nonnull, warn_unused_result))
1820
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1821
mandos_context *mc){
1342
1823
struct timespec now;
1343
1824
struct timespec waited_time;
1344
1825
intmax_t block_time;
1347
if(mc.current_server == NULL){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1828
if(mc->current_server == NULL){
1830
fprintf_plus(stderr, "Wait until first server is found."
1352
1833
ret = avahi_simple_poll_iterate(s, -1);
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1836
fprintf_plus(stderr, "Check current_server if we should run"
1359
1839
/* the current time */
1360
1840
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1403
1883
ret = avahi_simple_poll_iterate(s, (int)block_time);
1406
if (ret > 0 or errno != EINTR){
1886
if(ret > 0 or errno != EINTR){
1407
1887
return (ret != 1) ? ret : 0;
1893
__attribute__((nonnull))
1894
void run_network_hooks(const char *mode, const char *interface,
1896
struct dirent **direntries = NULL;
1897
if(hookdir_fd == -1){
1898
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1900
if(hookdir_fd == -1){
1901
if(errno == ENOENT){
1903
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1904
" found\n", hookdir);
1907
perror_plus("open");
1912
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1913
runnable_hook, alphasort);
1915
perror_plus("scandir");
1918
struct dirent *direntry;
1920
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1922
perror_plus("open(\"/dev/null\", O_RDONLY)");
1925
for(int i = 0; i < numhooks; i++){
1926
direntry = direntries[i];
1928
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1931
pid_t hook_pid = fork();
1934
/* Raise privileges */
1935
errno = raise_privileges_permanently();
1937
perror_plus("Failed to raise privileges");
1944
perror_plus("setgid");
1947
/* Reset supplementary groups */
1949
ret = setgroups(0, NULL);
1951
perror_plus("setgroups");
1954
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1956
perror_plus("setenv");
1959
ret = setenv("DEVICE", interface, 1);
1961
perror_plus("setenv");
1964
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1966
perror_plus("setenv");
1969
ret = setenv("MODE", mode, 1);
1971
perror_plus("setenv");
1975
ret = asprintf(&delaystring, "%f", (double)delay);
1977
perror_plus("asprintf");
1980
ret = setenv("DELAY", delaystring, 1);
1983
perror_plus("setenv");
1987
if(connect_to != NULL){
1988
ret = setenv("CONNECT", connect_to, 1);
1990
perror_plus("setenv");
1994
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1998
perror_plus("openat");
1999
_exit(EXIT_FAILURE);
2001
if(close(hookdir_fd) == -1){
2002
perror_plus("close");
2003
_exit(EXIT_FAILURE);
2005
ret = dup2(devnull, STDIN_FILENO);
2007
perror_plus("dup2(devnull, STDIN_FILENO)");
2010
ret = close(devnull);
2012
perror_plus("close");
2015
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2017
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2020
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2022
perror_plus("fexecve");
2023
_exit(EXIT_FAILURE);
2027
perror_plus("fork");
2032
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2033
perror_plus("waitpid");
2037
if(WIFEXITED(status)){
2038
if(WEXITSTATUS(status) != 0){
2039
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2040
" with status %d\n", direntry->d_name,
2041
WEXITSTATUS(status));
2045
} else if(WIFSIGNALED(status)){
2046
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2047
" signal %d\n", direntry->d_name,
2052
fprintf_plus(stderr, "Warning: network hook \"%s\""
2053
" crashed\n", direntry->d_name);
2059
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2065
if(close(hookdir_fd) == -1){
2066
perror_plus("close");
2073
__attribute__((nonnull, warn_unused_result))
2074
error_t bring_up_interface(const char *const interface,
2076
error_t old_errno = errno;
2078
struct ifreq network;
2079
unsigned int if_index = if_nametoindex(interface);
2081
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2091
if(not interface_is_up(interface)){
2092
error_t ret_errno = 0, ioctl_errno = 0;
2093
if(not get_flags(interface, &network)){
2095
fprintf_plus(stderr, "Failed to get flags for interface "
2096
"\"%s\"\n", interface);
2100
network.ifr_flags |= IFF_UP; /* set flag */
2102
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2105
perror_plus("socket");
2113
perror_plus("close");
2120
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2124
/* Raise privileges */
2125
ret_errno = raise_privileges();
2128
perror_plus("Failed to raise privileges");
2133
bool restore_loglevel = false;
2135
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2136
messages about the network interface to mess up the prompt */
2137
ret_linux = klogctl(8, NULL, 5);
2138
if(ret_linux == -1){
2139
perror_plus("klogctl");
2141
restore_loglevel = true;
2144
#endif /* __linux__ */
2145
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2146
ioctl_errno = errno;
2148
if(restore_loglevel){
2149
ret_linux = klogctl(7, NULL, 0);
2150
if(ret_linux == -1){
2151
perror_plus("klogctl");
2154
#endif /* __linux__ */
2156
/* If raise_privileges() succeeded above */
2158
/* Lower privileges */
2159
ret_errno = lower_privileges();
2162
perror_plus("Failed to lower privileges");
2166
/* Close the socket */
2169
perror_plus("close");
2172
if(ret_setflags == -1){
2173
errno = ioctl_errno;
2174
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2179
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2183
/* Sleep checking until interface is running.
2184
Check every 0.25s, up to total time of delay */
2185
for(int i=0; i < delay * 4; i++){
2186
if(interface_is_running(interface)){
2189
struct timespec sleeptime = { .tv_nsec = 250000000 };
2190
ret = nanosleep(&sleeptime, NULL);
2191
if(ret == -1 and errno != EINTR){
2192
perror_plus("nanosleep");
2200
__attribute__((nonnull, warn_unused_result))
2201
error_t take_down_interface(const char *const interface){
2202
error_t old_errno = errno;
2203
struct ifreq network;
2204
unsigned int if_index = if_nametoindex(interface);
2206
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2210
if(interface_is_up(interface)){
2211
error_t ret_errno = 0, ioctl_errno = 0;
2212
if(not get_flags(interface, &network) and debug){
2214
fprintf_plus(stderr, "Failed to get flags for interface "
2215
"\"%s\"\n", interface);
2219
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2221
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2224
perror_plus("socket");
2230
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2234
/* Raise privileges */
2235
ret_errno = raise_privileges();
2238
perror_plus("Failed to raise privileges");
2241
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2242
ioctl_errno = errno;
2244
/* If raise_privileges() succeeded above */
2246
/* Lower privileges */
2247
ret_errno = lower_privileges();
2250
perror_plus("Failed to lower privileges");
2254
/* Close the socket */
2255
int ret = close(sd);
2257
perror_plus("close");
2260
if(ret_setflags == -1){
2261
errno = ioctl_errno;
2262
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2267
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1413
2275
int main(int argc, char *argv[]){
2276
mandos_context mc = { .server = NULL, .dh_bits = 0,
2277
.priority = "SECURE256:!CTYPE-X.509"
2278
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2279
.current_server = NULL, .interfaces = NULL,
2280
.interfaces_size = 0 };
1414
2281
AvahiSServiceBrowser *sb = NULL;
1417
2284
intmax_t tmpmax;
1419
2286
int exitcode = EXIT_SUCCESS;
1420
const char *interface = "";
1421
struct ifreq network;
1423
bool take_down_interface = false;
1426
char tempdir[] = "/tmp/mandosXXXXXX";
1427
bool tempdir_created = false;
2287
char *interfaces_to_take_down = NULL;
2288
size_t interfaces_to_take_down_size = 0;
2289
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2290
char old_tempdir[] = "/tmp/mandosXXXXXX";
2291
char *tempdir = NULL;
1428
2292
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1429
2293
const char *seckey = PATHDIR "/" SECKEY;
1430
2294
const char *pubkey = PATHDIR "/" PUBKEY;
2295
const char *dh_params_file = NULL;
2296
char *interfaces_hooks = NULL;
1432
2298
bool gnutls_initialized = false;
1433
2299
bool gpgme_initialized = false;
1608
2485
/* Work around Debian bug #633582:
1609
2486
<http://bugs.debian.org/633582> */
1612
/* Re-raise priviliges */
1616
perror_plus("seteuid");
1619
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1620
int seckey_fd = open(seckey, O_RDONLY);
1621
if(seckey_fd == -1){
1622
perror_plus("open");
1624
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1626
perror_plus("fstat");
1628
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1629
ret = fchown(seckey_fd, uid, gid);
1631
perror_plus("fchown");
1635
TEMP_FAILURE_RETRY(close(seckey_fd));
1639
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1640
int pubkey_fd = open(pubkey, O_RDONLY);
1641
if(pubkey_fd == -1){
1642
perror_plus("open");
1644
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1646
perror_plus("fstat");
1648
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1649
ret = fchown(pubkey_fd, uid, gid);
1651
perror_plus("fchown");
1655
TEMP_FAILURE_RETRY(close(pubkey_fd));
1659
/* Lower privileges */
1663
perror_plus("seteuid");
1667
/* Find network hooks and run them */
1669
struct dirent **direntries;
1670
struct dirent *direntry;
1671
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1674
perror_plus("scandir");
2488
/* Re-raise privileges */
2489
ret_errno = raise_privileges();
2492
perror_plus("Failed to raise privileges");
1676
int devnull = open("/dev/null", O_RDONLY);
1677
for(int i = 0; i < numhooks; i++){
1678
direntry = direntries[0];
1679
char *fullname = NULL;
1680
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1682
perror_plus("asprintf");
1685
pid_t hook_pid = fork();
1688
dup2(devnull, STDIN_FILENO);
1690
dup2(STDERR_FILENO, STDOUT_FILENO);
1691
ret = setenv("DEVICE", interface, 1);
1693
perror_plus("setenv");
1696
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1698
perror_plus("setenv");
1701
ret = setenv("MODE", "start", 1);
1703
perror_plus("setenv");
1707
ret = asprintf(&delaystring, "%f", delay);
1709
perror_plus("asprintf");
1712
ret = setenv("DELAY", delaystring, 1);
1715
perror_plus("setenv");
1719
ret = execl(fullname, direntry->d_name, "start", NULL);
1720
perror_plus("execl");
1723
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1724
perror_plus("waitpid");
1728
if(WIFEXITED(status)){
1729
if(WEXITSTATUS(status) != 0){
1730
fprintf(stderr, "Mandos plugin mandos-client: "
1731
"Warning: network hook \"%s\" exited"
1732
" with status %d\n", direntry->d_name,
1733
WEXITSTATUS(status));
1737
} else if(WIFSIGNALED(status)){
1738
fprintf(stderr, "Mandos plugin mandos-client: "
1739
"Warning: network hook \"%s\" died by"
1740
" signal %d\n", direntry->d_name,
1745
fprintf(stderr, "Mandos plugin mandos-client: "
1746
"Warning: network hook \"%s\" crashed\n",
2496
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2497
int seckey_fd = open(seckey, O_RDONLY);
2498
if(seckey_fd == -1){
2499
perror_plus("open");
2501
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2503
perror_plus("fstat");
2505
if(S_ISREG(st.st_mode)
2506
and st.st_uid == 0 and st.st_gid == 0){
2507
ret = fchown(seckey_fd, uid, gid);
2509
perror_plus("fchown");
2517
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2518
int pubkey_fd = open(pubkey, O_RDONLY);
2519
if(pubkey_fd == -1){
2520
perror_plus("open");
2522
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2524
perror_plus("fstat");
2526
if(S_ISREG(st.st_mode)
2527
and st.st_uid == 0 and st.st_gid == 0){
2528
ret = fchown(pubkey_fd, uid, gid);
2530
perror_plus("fchown");
2538
if(dh_params_file != NULL
2539
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2540
int dhparams_fd = open(dh_params_file, O_RDONLY);
2541
if(dhparams_fd == -1){
2542
perror_plus("open");
2544
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2546
perror_plus("fstat");
2548
if(S_ISREG(st.st_mode)
2549
and st.st_uid == 0 and st.st_gid == 0){
2550
ret = fchown(dhparams_fd, uid, gid);
2552
perror_plus("fchown");
2560
/* Lower privileges */
2561
ret_errno = lower_privileges();
2564
perror_plus("Failed to lower privileges");
2569
/* Remove invalid interface names (except "none") */
2571
char *interface = NULL;
2572
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2574
if(strcmp(interface, "none") != 0
2575
and if_nametoindex(interface) == 0){
2576
if(interface[0] != '\0'){
2577
fprintf_plus(stderr, "Not using nonexisting interface"
2578
" \"%s\"\n", interface);
2580
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2586
/* Run network hooks */
2588
if(mc.interfaces != NULL){
2589
interfaces_hooks = malloc(mc.interfaces_size);
2590
if(interfaces_hooks == NULL){
2591
perror_plus("malloc");
2594
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2595
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2597
run_network_hooks("start", interfaces_hooks != NULL ?
2598
interfaces_hooks : "", delay);
1762
2602
avahi_set_log_function(empty_log);
1765
if(interface[0] == '\0'){
1766
struct dirent **direntries;
1767
/* First look for interfaces that are up */
1768
ret = scandir(sys_class_net, &direntries, up_interface,
1771
/* No up interfaces, look for any good interfaces */
1773
ret = scandir(sys_class_net, &direntries, good_interface,
1777
/* Pick the first interface returned */
1778
interface = strdup(direntries[0]->d_name);
1780
fprintf(stderr, "Mandos plugin mandos-client: "
1781
"Using interface \"%s\"\n", interface);
1783
if(interface == NULL){
1784
perror_plus("malloc");
1786
exitcode = EXIT_FAILURE;
1792
fprintf(stderr, "Mandos plugin mandos-client: "
1793
"Could not find a network interface\n");
1794
exitcode = EXIT_FAILURE;
1799
2605
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1800
2606
from the signal handler */
1801
2607
/* Initialize the pseudo-RNG for Avahi */
1802
2608
srand((unsigned int) time(NULL));
1803
mc.simple_poll = avahi_simple_poll_new();
1804
if(mc.simple_poll == NULL){
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Avahi: Failed to create simple poll object.\n");
2609
simple_poll = avahi_simple_poll_new();
2610
if(simple_poll == NULL){
2611
fprintf_plus(stderr,
2612
"Avahi: Failed to create simple poll object.\n");
1807
2613
exitcode = EX_UNAVAILABLE;
1874
/* If the interface is down, bring it up */
1875
if(strcmp(interface, "none") != 0){
1876
if_index = (AvahiIfIndex) if_nametoindex(interface);
1878
fprintf(stderr, "Mandos plugin mandos-client: "
1879
"No such interface: \"%s\"\n", interface);
1880
exitcode = EX_UNAVAILABLE;
1888
/* Re-raise priviliges */
1892
perror_plus("seteuid");
1896
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1897
messages about the network interface to mess up the prompt */
1898
ret = klogctl(8, NULL, 5);
1899
bool restore_loglevel = true;
1901
restore_loglevel = false;
1902
perror_plus("klogctl");
1904
#endif /* __linux__ */
1906
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1908
perror_plus("socket");
1909
exitcode = EX_OSERR;
1911
if(restore_loglevel){
1912
ret = klogctl(7, NULL, 0);
1914
perror_plus("klogctl");
1917
#endif /* __linux__ */
1918
/* Lower privileges */
1922
perror_plus("seteuid");
1926
strcpy(network.ifr_name, interface);
1927
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1929
perror_plus("ioctl SIOCGIFFLAGS");
1931
if(restore_loglevel){
1932
ret = klogctl(7, NULL, 0);
1934
perror_plus("klogctl");
1937
#endif /* __linux__ */
1938
exitcode = EX_OSERR;
1939
/* Lower privileges */
1943
perror_plus("seteuid");
1947
if((network.ifr_flags & IFF_UP) == 0){
1948
network.ifr_flags |= IFF_UP;
1949
take_down_interface = true;
1950
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1952
take_down_interface = false;
1953
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1954
exitcode = EX_OSERR;
1956
if(restore_loglevel){
1957
ret = klogctl(7, NULL, 0);
1959
perror_plus("klogctl");
2680
/* If no interfaces were specified, make a list */
2681
if(mc.interfaces == NULL){
2682
struct dirent **direntries = NULL;
2683
/* Look for any good interfaces */
2684
ret = scandir(sys_class_net, &direntries, good_interface,
2687
/* Add all found interfaces to interfaces list */
2688
for(int i = 0; i < ret; ++i){
2689
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2690
direntries[i]->d_name);
2693
perror_plus("argz_add");
2694
free(direntries[i]);
2698
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2699
direntries[i]->d_name);
2701
free(direntries[i]);
2708
fprintf_plus(stderr, "Could not find a network interface\n");
2709
exitcode = EXIT_FAILURE;
2714
/* Bring up interfaces which are down, and remove any "none"s */
2716
char *interface = NULL;
2717
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2719
/* If interface name is "none", stop bringing up interfaces.
2720
Also remove all instances of "none" from the list */
2721
if(strcmp(interface, "none") == 0){
2722
argz_delete(&mc.interfaces, &mc.interfaces_size,
2725
while((interface = argz_next(mc.interfaces,
2726
mc.interfaces_size, interface))){
2727
if(strcmp(interface, "none") == 0){
2728
argz_delete(&mc.interfaces, &mc.interfaces_size,
1962
#endif /* __linux__ */
1963
/* Lower privileges */
1967
perror_plus("seteuid");
1972
/* Sleep checking until interface is running.
1973
Check every 0.25s, up to total time of delay */
1974
for(int i=0; i < delay * 4; i++){
1975
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1977
perror_plus("ioctl SIOCGIFFLAGS");
1978
} else if(network.ifr_flags & IFF_RUNNING){
1981
struct timespec sleeptime = { .tv_nsec = 250000000 };
1982
ret = nanosleep(&sleeptime, NULL);
1983
if(ret == -1 and errno != EINTR){
1984
perror_plus("nanosleep");
1987
if(not take_down_interface){
1988
/* We won't need the socket anymore */
1989
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1991
perror_plus("close");
1995
if(restore_loglevel){
1996
/* Restores kernel loglevel to default */
1997
ret = klogctl(7, NULL, 0);
1999
perror_plus("klogctl");
2002
#endif /* __linux__ */
2003
/* Lower privileges */
2005
if(take_down_interface){
2006
/* Lower privileges */
2009
perror_plus("seteuid");
2012
/* Lower privileges permanently */
2015
perror_plus("setuid");
2735
bool interface_was_up = interface_is_up(interface);
2736
errno = bring_up_interface(interface, delay);
2737
if(not interface_was_up){
2739
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2740
" %s\n", interface, strerror(errno));
2742
errno = argz_add(&interfaces_to_take_down,
2743
&interfaces_to_take_down_size,
2746
perror_plus("argz_add");
2751
if(debug and (interfaces_to_take_down == NULL)){
2752
fprintf_plus(stderr, "No interfaces were brought up\n");
2756
/* If we only got one interface, explicitly use only that one */
2757
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2759
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2762
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2024
ret = init_gnutls_global(pubkey, seckey);
2769
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2026
fprintf(stderr, "Mandos plugin mandos-client: "
2027
"init_gnutls_global failed\n");
2771
fprintf_plus(stderr, "init_gnutls_global failed\n");
2028
2772
exitcode = EX_UNAVAILABLE;
2182
2931
/* Run the main loop */
2185
fprintf(stderr, "Mandos plugin mandos-client: "
2186
"Starting Avahi loop search\n");
2934
fprintf_plus(stderr, "Starting Avahi loop search\n");
2189
ret = avahi_loop_with_timeout(mc.simple_poll,
2190
(int)(retry_interval * 1000));
2937
ret = avahi_loop_with_timeout(simple_poll,
2938
(int)(retry_interval * 1000), &mc);
2192
fprintf(stderr, "Mandos plugin mandos-client: "
2193
"avahi_loop_with_timeout exited %s\n",
2194
(ret == 0) ? "successfully" : "with error");
2940
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2941
(ret == 0) ? "successfully" : "with error");
2200
fprintf(stderr, "Mandos plugin mandos-client: "
2201
"%s exiting\n", argv[0]);
2947
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2204
2950
/* Cleanup things */
2951
free(mc.interfaces);
2206
2954
avahi_s_service_browser_free(sb);
2208
2956
if(mc.server != NULL)
2209
2957
avahi_server_free(mc.server);
2211
if(mc.simple_poll != NULL)
2212
avahi_simple_poll_free(mc.simple_poll);
2959
if(simple_poll != NULL)
2960
avahi_simple_poll_free(simple_poll);
2214
2962
if(gnutls_initialized){
2215
2963
gnutls_certificate_free_credentials(mc.cred);
2216
gnutls_global_deinit();
2217
2964
gnutls_dh_params_deinit(mc.dh_params);
2220
2967
if(gpgme_initialized){
2221
2968
gpgme_release(mc.ctx);
2224
2971
/* Cleans up the circular linked list of Mandos servers the client
2226
2973
if(mc.current_server != NULL){
2227
2974
mc.current_server->prev->next = NULL;
2228
2975
while(mc.current_server != NULL){
2229
2976
server *next = mc.current_server->next;
2978
#pragma GCC diagnostic push
2979
#pragma GCC diagnostic ignored "-Wcast-qual"
2981
free((char *)(mc.current_server->ip));
2983
#pragma GCC diagnostic pop
2230
2985
free(mc.current_server);
2231
2986
mc.current_server = next;
2235
/* XXX run network hooks "stop" here */
2237
/* Take down the network interface */
2238
if(take_down_interface){
2239
/* Re-raise priviliges */
2243
perror_plus("seteuid");
2246
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2248
perror_plus("ioctl SIOCGIFFLAGS");
2249
} else if(network.ifr_flags & IFF_UP){
2250
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2251
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2253
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2256
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2258
perror_plus("close");
2260
/* Lower privileges permanently */
2264
perror_plus("setuid");
2990
/* Re-raise privileges */
2992
ret_errno = raise_privileges();
2995
perror_plus("Failed to raise privileges");
2998
/* Run network hooks */
2999
run_network_hooks("stop", interfaces_hooks != NULL ?
3000
interfaces_hooks : "", delay);
3002
/* Take down the network interfaces which were brought up */
3004
char *interface = NULL;
3005
while((interface=argz_next(interfaces_to_take_down,
3006
interfaces_to_take_down_size,
3008
ret_errno = take_down_interface(interface);
3011
perror_plus("Failed to take down interface");
3014
if(debug and (interfaces_to_take_down == NULL)){
3015
fprintf_plus(stderr, "No interfaces needed to be taken"
3021
ret_errno = lower_privileges_permanently();
3024
perror_plus("Failed to lower privileges permanently");
3028
free(interfaces_to_take_down);
3029
free(interfaces_hooks);
3031
void clean_dir_at(int base, const char * const dirname,
3033
struct dirent **direntries = NULL;
3035
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3041
perror_plus("open");
3043
int numentries = scandirat(dir_fd, ".", &direntries,
3044
notdotentries, alphasort);
3045
if(numentries >= 0){
3046
for(int i = 0; i < numentries; i++){
3048
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3049
dirname, direntries[i]->d_name);
3051
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3053
if(errno == EISDIR){
3054
dret = unlinkat(dir_fd, direntries[i]->d_name,
3057
if((dret == -1) and (errno == ENOTEMPTY)
3058
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3059
== 0) and (level == 0)){
3060
/* Recurse only in this special case */
3061
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3065
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3066
direntries[i]->d_name, strerror(errno));
3069
free(direntries[i]);
3072
/* need to clean even if 0 because man page doesn't specify */
3074
if(numentries == -1){
3075
perror_plus("scandirat");
3077
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3078
if(dret == -1 and errno != ENOENT){
3079
perror_plus("rmdir");
3082
perror_plus("scandirat");
2269
3087
/* Removes the GPGME temp directory and all files inside */
2270
if(tempdir_created){
2271
struct dirent **direntries = NULL;
2272
struct dirent *direntry = NULL;
2273
int numentries = scandir(tempdir, &direntries, notdotentries,
2275
if (numentries > 0){
2276
for(int i = 0; i < numentries; i++){
2277
direntry = direntries[i];
2278
char *fullname = NULL;
2279
ret = asprintf(&fullname, "%s/%s", tempdir,
2282
perror_plus("asprintf");
2285
ret = remove(fullname);
2287
fprintf(stderr, "Mandos plugin mandos-client: "
2288
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2294
/* need to clean even if 0 because man page doesn't specify */
2296
if (numentries == -1){
2297
perror_plus("scandir");
2299
ret = rmdir(tempdir);
2300
if(ret == -1 and errno != ENOENT){
2301
perror_plus("rmdir");
3088
if(tempdir != NULL){
3089
clean_dir_at(-1, tempdir, 0);