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(),
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
239
215
if(new_server->ip == NULL){
240
216
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
258
219
/* Special case of first server */
259
if(*current_server == NULL){
220
if (mc.current_server == NULL){
260
221
new_server->next = new_server;
261
222
new_server->prev = new_server;
262
*current_server = new_server;
223
mc.current_server = new_server;
224
/* Place the new server last in the list */
264
/* Place the new server last in the list */
265
new_server->next = *current_server;
266
new_server->prev = (*current_server)->prev;
226
new_server->next = mc.current_server;
227
new_server->prev = mc.current_server->prev;
267
228
new_server->prev->next = new_server;
268
(*current_server)->prev = new_server;
229
mc.current_server->prev = new_server;
231
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
233
perror_plus("clock_gettime");
274
240
* Initialize GPGME.
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,
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
const char *tempdir){
281
244
gpgme_error_t rc;
282
245
gpgme_engine_info_t engine_info;
285
249
* Helper function to insert pub and seckey to the engine keyring.
287
bool import_key(const char * const filename){
251
bool import_key(const char *filename){
290
254
gpgme_data_t pgp_data;
383
350
ssize_t plaintext_length = 0;
386
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"Trying to decrypt OpenPGP data\n");
389
357
/* Create new GPGME data buffer from memory cryptotext */
390
358
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
392
360
if(rc != GPG_ERR_NO_ERROR){
393
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
394
gpgme_strsource(rc), gpgme_strerror(rc));
361
fprintf(stderr, "Mandos plugin mandos-client: "
362
"bad gpgme_data_new_from_mem: %s: %s\n",
363
gpgme_strsource(rc), gpgme_strerror(rc));
398
367
/* Create new empty GPGME data buffer for the plaintext */
399
368
rc = gpgme_data_new(&dh_plain);
400
369
if(rc != GPG_ERR_NO_ERROR){
401
fprintf_plus(stderr, "Mandos plugin mandos-client: "
402
"bad gpgme_data_new: %s: %s\n",
403
gpgme_strsource(rc), gpgme_strerror(rc));
370
fprintf(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
404
373
gpgme_data_release(dh_crypto);
408
377
/* Decrypt data from the cryptotext data buffer to the plaintext
410
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
411
380
if(rc != GPG_ERR_NO_ERROR){
412
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
413
gpgme_strsource(rc), gpgme_strerror(rc));
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
414
384
plaintext_length = -1;
416
386
gpgme_decrypt_result_t result;
417
result = gpgme_op_decrypt_result(mc->ctx);
387
result = gpgme_op_decrypt_result(mc.ctx);
418
388
if(result == NULL){
419
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
389
fprintf(stderr, "Mandos plugin mandos-client: "
390
"gpgme_op_decrypt_result failed\n");
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);
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"Unsupported algorithm: %s\n",
394
result->unsupported_algorithm);
395
fprintf(stderr, "Mandos plugin mandos-client: "
396
"Wrong key usage: %u\n",
397
result->wrong_key_usage);
425
398
if(result->file_name != NULL){
426
fprintf_plus(stderr, "File name: %s\n", result->file_name);
399
fprintf(stderr, "Mandos plugin mandos-client: "
400
"File name: %s\n", result->file_name);
428
402
gpgme_recipient_t recipient;
429
403
recipient = result->recipients;
430
404
while(recipient != NULL){
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
405
fprintf(stderr, "Mandos plugin mandos-client: "
406
"Public key algorithm: %s\n",
407
gpgme_pubkey_algo_name(recipient->pubkey_algo));
408
fprintf(stderr, "Mandos plugin mandos-client: "
409
"Key ID: %s\n", recipient->keyid);
410
fprintf(stderr, "Mandos plugin mandos-client: "
411
"Secret key available: %s\n",
412
recipient->status == GPG_ERR_NO_SECKEY
438
414
recipient = recipient->next;
497
475
return plaintext_length;
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
static const char * safer_gnutls_strerror(int value){
479
const char *ret = gnutls_strerror(value); /* Spurious warning from
480
-Wunreachable-code */
513
486
/* GnuTLS log function callback */
514
__attribute__((nonnull))
515
487
static void debuggnutls(__attribute__((unused)) int level,
516
488
const char* string){
517
fprintf_plus(stderr, "GnuTLS: %s", string);
489
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
520
__attribute__((nonnull(1, 2, 4), warn_unused_result))
521
492
static int init_gnutls_global(const char *pubkeyfilename,
522
const char *seckeyfilename,
523
const char *dhparamsfilename,
493
const char *seckeyfilename){
529
fprintf_plus(stderr, "Initializing GnuTLS\n");
497
fprintf(stderr, "Mandos plugin mandos-client: "
498
"Initializing GnuTLS\n");
501
ret = gnutls_global_init();
502
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Mandos plugin mandos-client: "
504
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
540
516
/* OpenPGP credentials */
541
ret = gnutls_certificate_allocate_credentials(&mc->cred);
517
ret = gnutls_certificate_allocate_credentials(&mc.cred);
542
518
if(ret != GNUTLS_E_SUCCESS){
543
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
544
safer_gnutls_strerror(ret));
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
521
gnutls_global_deinit();
549
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
550
" secret key %s as GnuTLS credentials\n",
526
fprintf(stderr, "Mandos plugin mandos-client: "
527
"Attempting to use OpenPGP public key %s and"
528
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
555
532
ret = gnutls_certificate_set_openpgp_key_file
556
(mc->cred, pubkeyfilename, seckeyfilename,
533
(mc.cred, pubkeyfilename, seckeyfilename,
557
534
GNUTLS_OPENPGP_FMT_BASE64);
558
535
if(ret != GNUTLS_E_SUCCESS){
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
"Mandos plugin mandos-client: "
538
"Error[%d] while reading the OpenPGP key pair ('%s',"
539
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
567
545
/* GnuTLS server initialization */
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);
546
ret = gnutls_dh_params_init(&mc.dh_params);
547
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS DH parameter initialization:"
550
" %s\n", safer_gnutls_strerror(ret));
553
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
554
if(ret != GNUTLS_E_SUCCESS){
555
fprintf(stderr, "Mandos plugin mandos-client: "
556
"Error in GnuTLS prime generation: %s\n",
557
safer_gnutls_strerror(ret));
561
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
753
gnutls_certificate_free_credentials(mc->cred);
754
gnutls_dh_params_deinit(mc->dh_params);
567
gnutls_certificate_free_credentials(mc.cred);
568
gnutls_global_deinit();
569
gnutls_dh_params_deinit(mc.dh_params);
758
__attribute__((nonnull, warn_unused_result))
759
static int init_gnutls_session(gnutls_session_t *session,
573
static int init_gnutls_session(gnutls_session_t *session){
762
575
/* GnuTLS session creation */
815
632
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
816
633
__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);
1036
635
/* Called when a Mandos server is found */
1037
__attribute__((nonnull, warn_unused_result))
1038
static int start_mandos_communication(const char *ip, in_port_t port,
636
static int start_mandos_communication(const char *ip, uint16_t port,
1039
637
AvahiIfIndex if_index,
1040
int af, mandos_context *mc){
1041
639
int ret, tcp_sd = -1;
1043
struct sockaddr_storage to;
642
struct sockaddr_in in;
643
struct sockaddr_in6 in6;
1044
645
char *buffer = NULL;
1045
646
char *decrypted_buffer = NULL;
1046
647
size_t buffer_length = 0;
1069
fprintf_plus(stderr, "Bad address family: %d\n", af);
669
fprintf(stderr, "Mandos plugin mandos-client: "
670
"Bad address family: %d\n", af);
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);
675
ret = init_gnutls_session(&session);
1112
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1113
PRIuMAX "\n", ip, (uintmax_t)port);
681
fprintf(stderr, "Mandos plugin mandos-client: "
682
"Setting up a TCP connection to %s, port %" PRIu16
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
686
tcp_sd = socket(pf, SOCK_STREAM, 0);
1119
689
perror_plus("socket");
1175
752
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1176
753
perror_plus("if_indextoname");
1178
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1179
"\n", ip, interface, (uintmax_t)port);
755
fprintf(stderr, "Mandos plugin mandos-client: "
756
"Connection to: %s%%%s, port %" PRIu16 "\n",
757
ip, interface, port);
1182
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1183
ip, (uintmax_t)port);
760
fprintf(stderr, "Mandos plugin mandos-client: "
761
"Connection to: %s, port %" PRIu16 "\n", ip, port);
1185
763
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1186
764
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
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");
767
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
770
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
774
perror_plus("inet_ntop");
776
if(strcmp(addrstr, ip) != 0){
777
fprintf(stderr, "Mandos plugin mandos-client: "
778
"Canonical address form: %s\n", addrstr);
789
ret = connect(tcp_sd, &to.in6, sizeof(to));
791
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
794
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
796
perror_plus("connect");
1269
807
const char *out = mandos_protocol_version;
1522
1051
char ip[AVAHI_ADDRESS_STR_MAX];
1523
1052
avahi_address_snprint(ip, sizeof(ip), address);
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);
1054
fprintf(stderr, "Mandos plugin mandos-client: "
1055
"Mandos server \"%s\" found on %s (%s, %"
1056
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1057
ip, (intmax_t)interface, port);
1529
int ret = start_mandos_communication(ip, (in_port_t)port,
1531
avahi_proto_to_af(proto),
1059
int ret = start_mandos_communication(ip, port, interface,
1060
avahi_proto_to_af(proto));
1534
avahi_simple_poll_quit(simple_poll);
1062
avahi_simple_poll_quit(mc.simple_poll);
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"
1064
ret = add_server(ip, port, interface,
1065
avahi_proto_to_af(proto));
1614
1134
signal_received = sig;
1615
1135
int old_errno = errno;
1616
1136
/* set main loop to exit */
1617
if(simple_poll != NULL){
1618
avahi_simple_poll_quit(simple_poll);
1137
if(mc.simple_poll != NULL){
1138
avahi_simple_poll_quit(mc.simple_poll);
1620
1140
errno = old_errno;
1623
__attribute__((nonnull, warn_unused_result))
1624
1143
bool get_flags(const char *ifname, struct ifreq *ifr){
1628
1146
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1631
1148
perror_plus("socket");
1635
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1636
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1151
strcpy(ifr->ifr_name, ifname);
1637
1152
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1641
1155
perror_plus("ioctl SIOCGIFFLAGS");
1649
__attribute__((nonnull, warn_unused_result))
1650
1162
bool good_flags(const char *ifname, const struct ifreq *ifr){
1652
1164
/* Reject the loopback device */
1653
1165
if(ifr->ifr_flags & IFF_LOOPBACK){
1655
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Rejecting loopback interface \"%s\"\n", ifname);
1660
1172
/* Accept point-to-point devices only if connect_to is specified */
1661
1173
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1663
fprintf_plus(stderr, "Accepting point-to-point interface"
1664
" \"%s\"\n", ifname);
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Accepting point-to-point interface \"%s\"\n", ifname);
1668
1180
/* Otherwise, reject non-broadcast-capable devices */
1669
1181
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1671
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1672
" \"%s\"\n", ifname);
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1676
1188
/* Reject non-ARP interfaces (including dummy interfaces) */
1677
1189
if(ifr->ifr_flags & IFF_NOARP){
1679
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Rejecting non-ARP interface \"%s\"\n", ifname);
1685
1197
/* Accept this device */
1687
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1199
fprintf(stderr, "Mandos plugin mandos-client: "
1200
"Interface \"%s\" is good\n", ifname);
1703
1215
struct ifreq ifr;
1704
1216
if(not get_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))
1218
fprintf(stderr, "Mandos plugin mandos-client: "
1219
"Failed to get flags for interface \"%s\"\n",
1225
if(not good_flags(if_entry->d_name, &ifr)){
1232
* This function determines if a directory entry in /sys/class/net
1233
* corresponds to an acceptable network device which is up.
1234
* (This function is passed to scandir(3) as a filter function.)
1236
int up_interface(const struct dirent *if_entry){
1237
if(if_entry->d_name[0] == '.'){
1242
if(not get_flags(if_entry->d_name, &ifr)){
1244
fprintf(stderr, "Mandos plugin mandos-client: "
1245
"Failed to get flags for interface \"%s\"\n",
1251
/* Reject down interfaces */
1252
if(not (ifr.ifr_flags & IFF_UP)){
1254
fprintf(stderr, "Mandos plugin mandos-client: "
1255
"Rejecting down interface \"%s\"\n",
1261
/* Reject non-running interfaces */
1262
if(not (ifr.ifr_flags & IFF_RUNNING)){
1264
fprintf(stderr, "Mandos plugin mandos-client: "
1265
"Rejecting non-running interface \"%s\"\n",
1271
if(not good_flags(if_entry->d_name, &ifr)){
1753
1277
int notdotentries(const struct dirent *direntry){
1754
1278
/* Skip "." and ".." */
1755
1279
if(direntry->d_name[0] == '.'
1796
1327
if(not (S_ISREG(st.st_mode))){
1797
1328
/* Not a regular file */
1799
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1330
fprintf(stderr, "Mandos plugin mandos-client: "
1331
"Ignoring hook \"%s\" - not a file\n",
1804
1336
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1805
1337
/* Not executable */
1807
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1339
fprintf(stderr, "Mandos plugin mandos-client: "
1340
"Ignoring hook \"%s\" - not executable\n",
1813
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1819
__attribute__((nonnull, warn_unused_result))
1820
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1821
mandos_context *mc){
1348
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1823
1350
struct timespec now;
1824
1351
struct timespec waited_time;
1825
1352
intmax_t block_time;
1828
if(mc->current_server == NULL){
1830
fprintf_plus(stderr, "Wait until first server is found."
1355
if(mc.current_server == NULL){
1357
fprintf(stderr, "Mandos plugin mandos-client: "
1358
"Wait until first server is found. No timeout!\n");
1833
1360
ret = avahi_simple_poll_iterate(s, -1);
1836
fprintf_plus(stderr, "Check current_server if we should run"
1363
fprintf(stderr, "Mandos plugin mandos-client: "
1364
"Check current_server if we should run it,"
1839
1367
/* the current time */
1840
1368
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1883
1411
ret = avahi_simple_poll_iterate(s, (int)block_time);
1886
if(ret > 0 or errno != EINTR){
1414
if (ret > 0 or errno != EINTR){
1887
1415
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",
2275
1421
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 };
2281
1422
AvahiSServiceBrowser *sb = NULL;
2284
1425
intmax_t tmpmax;
2286
1427
int exitcode = EXIT_SUCCESS;
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
const char *interface = "";
1429
struct ifreq network;
1431
bool take_down_interface = false;
1434
char tempdir[] = "/tmp/mandosXXXXXX";
1435
bool tempdir_created = false;
2292
1436
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2293
1437
const char *seckey = PATHDIR "/" SECKEY;
2294
1438
const char *pubkey = PATHDIR "/" PUBKEY;
2295
const char *dh_params_file = NULL;
2296
char *interfaces_hooks = NULL;
2298
1440
bool gnutls_initialized = false;
2299
1441
bool gpgme_initialized = false;
2485
1616
/* Work around Debian bug #633582:
2486
1617
<http://bugs.debian.org/633582> */
2488
/* Re-raise privileges */
2489
ret_errno = raise_privileges();
2492
perror_plus("Failed to raise privileges");
1620
/* Re-raise priviliges */
1624
perror_plus("seteuid");
1627
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1628
int seckey_fd = open(seckey, O_RDONLY);
1629
if(seckey_fd == -1){
1630
perror_plus("open");
1632
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1634
perror_plus("fstat");
1636
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1637
ret = fchown(seckey_fd, uid, gid);
1639
perror_plus("fchown");
1643
TEMP_FAILURE_RETRY(close(seckey_fd));
1647
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1648
int pubkey_fd = open(pubkey, O_RDONLY);
1649
if(pubkey_fd == -1){
1650
perror_plus("open");
1652
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1654
perror_plus("fstat");
1656
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1657
ret = fchown(pubkey_fd, uid, gid);
1659
perror_plus("fchown");
1663
TEMP_FAILURE_RETRY(close(pubkey_fd));
1667
/* Lower privileges */
1671
perror_plus("seteuid");
1675
/* Find network hooks and run them */
1677
struct dirent **direntries;
1678
struct dirent *direntry;
1679
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1682
perror_plus("scandir");
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);
1684
int devnull = open("/dev/null", O_RDONLY);
1685
for(int i = 0; i < numhooks; i++){
1686
direntry = direntries[0];
1687
char *fullname = NULL;
1688
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1690
perror_plus("asprintf");
1693
pid_t hook_pid = fork();
1696
dup2(devnull, STDIN_FILENO);
1698
dup2(STDERR_FILENO, STDOUT_FILENO);
1699
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1701
perror_plus("setenv");
1704
ret = setenv("DEVICE", interface, 1);
1706
perror_plus("setenv");
1709
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1711
perror_plus("setenv");
1714
ret = setenv("MODE", "start", 1);
1716
perror_plus("setenv");
1720
ret = asprintf(&delaystring, "%f", delay);
1722
perror_plus("asprintf");
1725
ret = setenv("DELAY", delaystring, 1);
1728
perror_plus("setenv");
1732
ret = execl(fullname, direntry->d_name, "start", NULL);
1733
perror_plus("execl");
1736
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1737
perror_plus("waitpid");
1741
if(WIFEXITED(status)){
1742
if(WEXITSTATUS(status) != 0){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" exited"
1745
" with status %d\n", direntry->d_name,
1746
WEXITSTATUS(status));
1750
} else if(WIFSIGNALED(status)){
1751
fprintf(stderr, "Mandos plugin mandos-client: "
1752
"Warning: network hook \"%s\" died by"
1753
" signal %d\n", direntry->d_name,
1758
fprintf(stderr, "Mandos plugin mandos-client: "
1759
"Warning: network hook \"%s\" crashed\n",
2602
1775
avahi_set_log_function(empty_log);
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1784
/* No up interfaces, look for any good interfaces */
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1793
fprintf(stderr, "Mandos plugin mandos-client: "
1794
"Using interface \"%s\"\n", interface);
1796
if(interface == NULL){
1797
perror_plus("malloc");
1799
exitcode = EXIT_FAILURE;
1805
fprintf(stderr, "Mandos plugin mandos-client: "
1806
"Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
2605
1812
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2606
1813
from the signal handler */
2607
1814
/* Initialize the pseudo-RNG for Avahi */
2608
1815
srand((unsigned int) time(NULL));
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");
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
1818
fprintf(stderr, "Mandos plugin mandos-client: "
1819
"Avahi: Failed to create simple poll object.\n");
2613
1820
exitcode = EX_UNAVAILABLE;
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]);
1887
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1891
fprintf(stderr, "Mandos plugin mandos-client: "
1892
"No such interface: \"%s\"\n", interface);
1893
exitcode = EX_UNAVAILABLE;
1901
/* Re-raise priviliges */
1905
perror_plus("seteuid");
1909
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1910
messages about the network interface to mess up the prompt */
1911
ret = klogctl(8, NULL, 5);
1912
bool restore_loglevel = true;
1914
restore_loglevel = false;
1915
perror_plus("klogctl");
1917
#endif /* __linux__ */
1919
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1921
perror_plus("socket");
1922
exitcode = EX_OSERR;
1924
if(restore_loglevel){
1925
ret = klogctl(7, NULL, 0);
1927
perror_plus("klogctl");
1930
#endif /* __linux__ */
1931
/* Lower privileges */
1935
perror_plus("seteuid");
1939
strcpy(network.ifr_name, interface);
1940
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1942
perror_plus("ioctl SIOCGIFFLAGS");
1944
if(restore_loglevel){
1945
ret = klogctl(7, NULL, 0);
1947
perror_plus("klogctl");
1950
#endif /* __linux__ */
1951
exitcode = EX_OSERR;
1952
/* Lower privileges */
1956
perror_plus("seteuid");
1960
if((network.ifr_flags & IFF_UP) == 0){
1961
network.ifr_flags |= IFF_UP;
1962
take_down_interface = true;
1963
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1965
take_down_interface = false;
1966
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1967
exitcode = EX_OSERR;
1969
if(restore_loglevel){
1970
ret = klogctl(7, NULL, 0);
1972
perror_plus("klogctl");
1975
#endif /* __linux__ */
1976
/* Lower privileges */
1980
perror_plus("seteuid");
1985
/* Sleep checking until interface is running.
1986
Check every 0.25s, up to total time of delay */
1987
for(int i=0; i < delay * 4; i++){
1988
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1990
perror_plus("ioctl SIOCGIFFLAGS");
1991
} else if(network.ifr_flags & IFF_RUNNING){
1994
struct timespec sleeptime = { .tv_nsec = 250000000 };
1995
ret = nanosleep(&sleeptime, NULL);
1996
if(ret == -1 and errno != EINTR){
1997
perror_plus("nanosleep");
2000
if(not take_down_interface){
2001
/* We won't need the socket anymore */
2002
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2004
perror_plus("close");
2008
if(restore_loglevel){
2009
/* Restores kernel loglevel to default */
2010
ret = klogctl(7, NULL, 0);
2012
perror_plus("klogctl");
2015
#endif /* __linux__ */
2016
/* Lower privileges */
2018
if(take_down_interface){
2019
/* Lower privileges */
2022
perror_plus("seteuid");
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,
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);
2025
/* Lower privileges permanently */
2028
perror_plus("setuid");
2769
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2037
ret = init_gnutls_global(pubkey, seckey);
2771
fprintf_plus(stderr, "init_gnutls_global failed\n");
2039
fprintf(stderr, "Mandos plugin mandos-client: "
2040
"init_gnutls_global failed\n");
2772
2041
exitcode = EX_UNAVAILABLE;
2931
2195
/* Run the main loop */
2934
fprintf_plus(stderr, "Starting Avahi loop search\n");
2198
fprintf(stderr, "Mandos plugin mandos-client: "
2199
"Starting Avahi loop search\n");
2937
ret = avahi_loop_with_timeout(simple_poll,
2938
(int)(retry_interval * 1000), &mc);
2202
ret = avahi_loop_with_timeout(mc.simple_poll,
2203
(int)(retry_interval * 1000));
2940
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2941
(ret == 0) ? "successfully" : "with error");
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"avahi_loop_with_timeout exited %s\n",
2207
(ret == 0) ? "successfully" : "with error");
2947
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2213
fprintf(stderr, "Mandos plugin mandos-client: "
2214
"%s exiting\n", argv[0]);
2950
2217
/* Cleanup things */
2951
free(mc.interfaces);
2954
2219
avahi_s_service_browser_free(sb);
2956
2221
if(mc.server != NULL)
2957
2222
avahi_server_free(mc.server);
2959
if(simple_poll != NULL)
2960
avahi_simple_poll_free(simple_poll);
2224
if(mc.simple_poll != NULL)
2225
avahi_simple_poll_free(mc.simple_poll);
2962
2227
if(gnutls_initialized){
2963
2228
gnutls_certificate_free_credentials(mc.cred);
2229
gnutls_global_deinit();
2964
2230
gnutls_dh_params_deinit(mc.dh_params);
2967
2233
if(gpgme_initialized){
2968
2234
gpgme_release(mc.ctx);
2971
2237
/* Cleans up the circular linked list of Mandos servers the client
2973
2239
if(mc.current_server != NULL){
2974
2240
mc.current_server->prev->next = NULL;
2975
2241
while(mc.current_server != NULL){
2976
2242
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
2985
2243
free(mc.current_server);
2986
2244
mc.current_server = next;
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"
2248
/* XXX run network hooks "stop" here */
2250
/* Take down the network interface */
2251
if(take_down_interface){
2252
/* Re-raise priviliges */
2256
perror_plus("seteuid");
3021
ret_errno = lower_privileges_permanently();
3024
perror_plus("Failed to lower privileges permanently");
2259
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2261
perror_plus("ioctl SIOCGIFFLAGS");
2262
} else if(network.ifr_flags & IFF_UP){
2263
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2264
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2266
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2269
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2271
perror_plus("close");
2273
/* Lower privileges permanently */
2277
perror_plus("setuid");
3028
free(interfaces_to_take_down);
3029
free(interfaces_hooks);
3031
void clean_dir_at(int base, const char * const dirname,
2282
/* Removes the GPGME temp directory and all files inside */
2283
if(tempdir_created){
3033
2284
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){
2285
struct dirent *direntry = NULL;
2286
int numentries = scandir(tempdir, &direntries, notdotentries,
2288
if (numentries > 0){
3046
2289
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");
3087
/* Removes the GPGME temp directory and all files inside */
3088
if(tempdir != NULL){
3089
clean_dir_at(-1, tempdir, 0);
2290
direntry = direntries[i];
2291
char *fullname = NULL;
2292
ret = asprintf(&fullname, "%s/%s", tempdir,
2295
perror_plus("asprintf");
2298
ret = remove(fullname);
2300
fprintf(stderr, "Mandos plugin mandos-client: "
2301
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2307
/* need to clean even if 0 because man page doesn't specify */
2309
if (numentries == -1){
2310
perror_plus("scandir");
2312
ret = rmdir(tempdir);
2313
if(ret == -1 and errno != ENOENT){
2314
perror_plus("rmdir");