9
9
* "browse_callback", and parts of "main".
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
20
* This program is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
15
* This file is part of Mandos.
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
22
* Mandos is distributed in the hope that it will be useful, but
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
29
30
* Contact the authors at <mandos@recompile.se>.
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
40
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
46
#include <stddef.h> /* NULL, size_t, ssize_t */
46
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
48
strtof(), abort() */
48
49
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
51
53
#include <sys/ioctl.h> /* ioctl */
52
54
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
55
sockaddr_in6, PF_INET6,
56
58
#include <sys/stat.h> /* open(), S_ISREG */
57
59
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
inet_pton(), connect(),
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
66
72
program_invocation_short_name */
67
73
#include <time.h> /* nanosleep(), time(), sleep() */
68
74
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
215
241
if(new_server->ip == NULL){
216
242
perror_plus("strdup");
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
248
perror_plus("clock_gettime");
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
253
free((char *)(new_server->ip));
255
#pragma GCC diagnostic pop
219
260
/* Special case of first server */
220
if (mc.current_server == NULL){
261
if(*current_server == NULL){
221
262
new_server->next = new_server;
222
263
new_server->prev = new_server;
223
mc.current_server = new_server;
224
/* Place the new server last in the list */
264
*current_server = new_server;
226
new_server->next = mc.current_server;
227
new_server->prev = mc.current_server->prev;
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
228
269
new_server->prev->next = 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");
270
(*current_server)->prev = new_server;
240
276
* Initialize GPGME.
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
const char *tempdir){
278
__attribute__((nonnull, warn_unused_result))
279
static bool init_gpgme(const char * const seckey,
280
const char * const pubkey,
281
const char * const tempdir,
244
283
gpgme_error_t rc;
245
284
gpgme_engine_info_t engine_info;
249
287
* Helper function to insert pub and seckey to the engine keyring.
251
bool import_key(const char *filename){
289
bool import_key(const char * const filename){
254
292
gpgme_data_t pgp_data;
350
385
ssize_t plaintext_length = 0;
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"Trying to decrypt OpenPGP data\n");
388
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
357
391
/* Create new GPGME data buffer from memory cryptotext */
358
392
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
360
394
if(rc != GPG_ERR_NO_ERROR){
361
fprintf(stderr, "Mandos plugin mandos-client: "
362
"bad gpgme_data_new_from_mem: %s: %s\n",
363
gpgme_strsource(rc), gpgme_strerror(rc));
395
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
396
gpgme_strsource(rc), gpgme_strerror(rc));
367
400
/* Create new empty GPGME data buffer for the plaintext */
368
401
rc = gpgme_data_new(&dh_plain);
369
402
if(rc != GPG_ERR_NO_ERROR){
370
fprintf(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
403
fprintf_plus(stderr, "Mandos plugin mandos-client: "
404
"bad gpgme_data_new: %s: %s\n",
405
gpgme_strsource(rc), gpgme_strerror(rc));
373
406
gpgme_data_release(dh_crypto);
377
410
/* Decrypt data from the cryptotext data buffer to the plaintext
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
380
413
if(rc != GPG_ERR_NO_ERROR){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
414
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
415
gpgme_strsource(rc), gpgme_strerror(rc));
384
416
plaintext_length = -1;
386
418
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc.ctx);
419
result = gpgme_op_decrypt_result(mc->ctx);
388
420
if(result == NULL){
389
fprintf(stderr, "Mandos plugin mandos-client: "
390
"gpgme_op_decrypt_result failed\n");
421
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
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);
423
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
424
result->unsupported_algorithm);
425
fprintf_plus(stderr, "Wrong key usage: %u\n",
426
result->wrong_key_usage);
398
427
if(result->file_name != NULL){
399
fprintf(stderr, "Mandos plugin mandos-client: "
400
"File name: %s\n", result->file_name);
428
fprintf_plus(stderr, "File name: %s\n", result->file_name);
402
430
gpgme_recipient_t recipient;
403
431
recipient = result->recipients;
404
432
while(recipient != NULL){
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
433
fprintf_plus(stderr, "Public key algorithm: %s\n",
434
gpgme_pubkey_algo_name
435
(recipient->pubkey_algo));
436
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
437
fprintf_plus(stderr, "Secret key available: %s\n",
438
recipient->status == GPG_ERR_NO_SECKEY
414
440
recipient = recipient->next;
475
499
return plaintext_length;
478
static const char * safer_gnutls_strerror(int value){
479
const char *ret = gnutls_strerror(value); /* Spurious warning from
480
-Wunreachable-code */
502
__attribute__((warn_unused_result, const))
503
static const char *safe_string(const char *str){
509
__attribute__((warn_unused_result))
510
static const char *safer_gnutls_strerror(int value){
511
const char *ret = gnutls_strerror(value);
512
return safe_string(ret);
486
515
/* GnuTLS log function callback */
516
__attribute__((nonnull))
487
517
static void debuggnutls(__attribute__((unused)) int level,
488
518
const char* string){
489
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
519
fprintf_plus(stderr, "GnuTLS: %s", string);
522
__attribute__((nonnull(1, 2, 4), warn_unused_result))
492
523
static int init_gnutls_global(const char *pubkeyfilename,
493
const char *seckeyfilename){
524
const char *seckeyfilename,
525
const char *dhparamsfilename,
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));
531
fprintf_plus(stderr, "Initializing GnuTLS\n");
516
542
/* OpenPGP credentials */
517
ret = gnutls_certificate_allocate_credentials(&mc.cred);
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
518
544
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
521
gnutls_global_deinit();
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
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,
551
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
552
" secret key %s as GnuTLS credentials\n",
532
557
ret = gnutls_certificate_set_openpgp_key_file
533
(mc.cred, pubkeyfilename, seckeyfilename,
558
(mc->cred, pubkeyfilename, seckeyfilename,
534
559
GNUTLS_OPENPGP_FMT_BASE64);
535
560
if(ret != GNUTLS_E_SUCCESS){
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));
562
"Error[%d] while reading the OpenPGP key pair ('%s',"
563
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
564
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
565
safer_gnutls_strerror(ret));
545
569
/* GnuTLS server initialization */
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);
570
ret = gnutls_dh_params_init(&mc->dh_params);
571
if(ret != GNUTLS_E_SUCCESS){
572
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
573
" initialization: %s\n",
574
safer_gnutls_strerror(ret));
577
/* If a Diffie-Hellman parameters file was given, try to use it */
578
if(dhparamsfilename != NULL){
579
gnutls_datum_t params = { .data = NULL, .size = 0 };
581
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
dhparamsfilename = NULL;
587
size_t params_capacity = 0;
589
params_capacity = incbuffer((char **)¶ms.data,
591
(size_t)params_capacity);
592
if(params_capacity == 0){
593
perror_plus("incbuffer");
596
dhparamsfilename = NULL;
599
ssize_t bytes_read = read(dhpfile,
600
params.data + params.size,
606
/* check bytes_read for failure */
611
dhparamsfilename = NULL;
614
params.size += (unsigned int)bytes_read;
616
if(params.data == NULL){
617
dhparamsfilename = NULL;
619
if(dhparamsfilename == NULL){
622
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
623
GNUTLS_X509_FMT_PEM);
624
if(ret != GNUTLS_E_SUCCESS){
625
fprintf_plus(stderr, "Failed to parse DH parameters in file"
626
" \"%s\": %s\n", dhparamsfilename,
627
safer_gnutls_strerror(ret));
628
dhparamsfilename = NULL;
633
if(dhparamsfilename == NULL){
634
if(mc->dh_bits == 0){
635
/* Find out the optimal number of DH bits */
636
/* Try to read the private key file */
637
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
int secfile = open(seckeyfilename, O_RDONLY);
644
size_t buffer_capacity = 0;
646
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer_capacity);
649
if(buffer_capacity == 0){
650
perror_plus("incbuffer");
655
ssize_t bytes_read = read(secfile,
656
buffer.data + buffer.size,
662
/* check bytes_read for failure */
669
buffer.size += (unsigned int)bytes_read;
673
/* If successful, use buffer to parse private key */
674
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
675
if(buffer.data != NULL){
677
gnutls_openpgp_privkey_t privkey = NULL;
678
ret = gnutls_openpgp_privkey_init(&privkey);
679
if(ret != GNUTLS_E_SUCCESS){
680
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
safer_gnutls_strerror(ret));
686
ret = gnutls_openpgp_privkey_import
687
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
688
if(ret != GNUTLS_E_SUCCESS){
689
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
690
safer_gnutls_strerror(ret));
696
/* Use private key to suggest an appropriate
698
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
699
gnutls_openpgp_privkey_deinit(privkey);
701
fprintf_plus(stderr, "This OpenPGP key implies using"
702
" a GnuTLS security parameter \"%s\".\n",
703
safe_string(gnutls_sec_param_get_name
709
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
710
/* Err on the side of caution */
711
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
fprintf_plus(stderr, "Falling back to security parameter"
715
safe_string(gnutls_sec_param_get_name
720
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
724
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
725
" implies %u DH bits; using that.\n",
726
safe_string(gnutls_sec_param_get_name
731
fprintf_plus(stderr, "Failed to get implied number of DH"
732
" bits for security parameter \"%s\"): %s\n",
733
safe_string(gnutls_sec_param_get_name
735
safer_gnutls_strerror(ret));
739
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
742
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
743
if(ret != GNUTLS_E_SUCCESS){
744
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
745
" bits): %s\n", mc->dh_bits,
746
safer_gnutls_strerror(ret));
750
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
567
gnutls_certificate_free_credentials(mc.cred);
568
gnutls_global_deinit();
569
gnutls_dh_params_deinit(mc.dh_params);
756
gnutls_certificate_free_credentials(mc->cred);
757
gnutls_dh_params_deinit(mc->dh_params);
573
static int init_gnutls_session(gnutls_session_t *session){
761
__attribute__((nonnull, warn_unused_result))
762
static int init_gnutls_session(gnutls_session_t *session,
575
765
/* GnuTLS session creation */
632
818
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
633
819
__attribute__((unused)) const char *txt){}
821
/* Set effective uid to 0, return errno */
822
__attribute__((warn_unused_result))
823
int raise_privileges(void){
824
int old_errno = errno;
826
if(seteuid(0) == -1){
833
/* Set effective and real user ID to 0. Return errno. */
834
__attribute__((warn_unused_result))
835
int raise_privileges_permanently(void){
836
int old_errno = errno;
837
int ret = raise_privileges();
849
/* Set effective user ID to unprivileged saved user ID */
850
__attribute__((warn_unused_result))
851
int lower_privileges(void){
852
int old_errno = errno;
854
if(seteuid(uid) == -1){
861
/* Lower privileges permanently */
862
__attribute__((warn_unused_result))
863
int lower_privileges_permanently(void){
864
int old_errno = errno;
866
if(setuid(uid) == -1){
873
/* Helper function to add_local_route() and delete_local_route() */
874
__attribute__((nonnull, warn_unused_result))
875
static bool add_delete_local_route(const bool add,
877
AvahiIfIndex if_index){
879
char helper[] = "mandos-client-iprouteadddel";
880
char add_arg[] = "add";
881
char delete_arg[] = "delete";
882
char debug_flag[] = "--debug";
883
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
884
if(pluginhelperdir == NULL){
886
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
887
" variable not set; cannot run helper\n");
892
char interface[IF_NAMESIZE];
893
if(if_indextoname((unsigned int)if_index, interface) == NULL){
894
perror_plus("if_indextoname");
898
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
900
perror_plus("open(\"/dev/null\", O_RDONLY)");
906
/* Raise privileges */
907
errno = raise_privileges_permanently();
909
perror_plus("Failed to raise privileges");
910
/* _exit(EX_NOPERM); */
916
perror_plus("setgid");
919
/* Reset supplementary groups */
921
ret = setgroups(0, NULL);
923
perror_plus("setgroups");
927
ret = dup2(devnull, STDIN_FILENO);
929
perror_plus("dup2(devnull, STDIN_FILENO)");
932
ret = close(devnull);
934
perror_plus("close");
937
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
939
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
942
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
947
if(helperdir_fd == -1){
949
_exit(EX_UNAVAILABLE);
951
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
954
perror_plus("openat");
956
_exit(EX_UNAVAILABLE);
960
#pragma GCC diagnostic push
961
#pragma GCC diagnostic ignored "-Wcast-qual"
963
if(fexecve(helper_fd, (char *const [])
964
{ helper, add ? add_arg : delete_arg, (char *)address,
965
interface, debug ? debug_flag : NULL, NULL },
968
#pragma GCC diagnostic pop
970
perror_plus("fexecve");
982
pret = waitpid(pid, &status, 0);
983
if(pret == -1 and errno == EINTR and quit_now){
984
int errno_raising = 0;
985
if((errno = raise_privileges()) != 0){
986
errno_raising = errno;
987
perror_plus("Failed to raise privileges in order to"
988
" kill helper program");
990
if(kill(pid, SIGTERM) == -1){
993
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
994
perror_plus("Failed to lower privileges after killing"
999
} while(pret == -1 and errno == EINTR);
1001
perror_plus("waitpid");
1004
if(WIFEXITED(status)){
1005
if(WEXITSTATUS(status) != 0){
1006
fprintf_plus(stderr, "Error: iprouteadddel exited"
1007
" with status %d\n", WEXITSTATUS(status));
1012
if(WIFSIGNALED(status)){
1013
fprintf_plus(stderr, "Error: iprouteadddel died by"
1014
" signal %d\n", WTERMSIG(status));
1017
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1021
__attribute__((nonnull, warn_unused_result))
1022
static bool add_local_route(const char *address,
1023
AvahiIfIndex if_index){
1025
fprintf_plus(stderr, "Adding route to %s\n", address);
1027
return add_delete_local_route(true, address, if_index);
1030
__attribute__((nonnull, warn_unused_result))
1031
static bool delete_local_route(const char *address,
1032
AvahiIfIndex if_index){
1034
fprintf_plus(stderr, "Removing route to %s\n", address);
1036
return add_delete_local_route(false, address, if_index);
635
1039
/* Called when a Mandos server is found */
636
static int start_mandos_communication(const char *ip, uint16_t port,
1040
__attribute__((nonnull, warn_unused_result))
1041
static int start_mandos_communication(const char *ip, in_port_t port,
637
1042
AvahiIfIndex if_index,
1043
int af, mandos_context *mc){
639
1044
int ret, tcp_sd = -1;
642
struct sockaddr_in in;
643
struct sockaddr_in6 in6;
1046
struct sockaddr_storage to;
645
1047
char *buffer = NULL;
646
1048
char *decrypted_buffer = NULL;
647
1049
size_t buffer_length = 0;
669
fprintf(stderr, "Mandos plugin mandos-client: "
670
"Bad address family: %d\n", af);
1072
fprintf_plus(stderr, "Bad address family: %d\n", af);
675
ret = init_gnutls_session(&session);
1077
/* If the interface is specified and we have a list of interfaces */
1078
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1079
/* Check if the interface is one of the interfaces we are using */
1082
char *interface = NULL;
1083
while((interface = argz_next(mc->interfaces,
1084
mc->interfaces_size,
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
1093
/* This interface does not match any in the list, so we don't
1094
connect to the server */
1096
char interface[IF_NAMESIZE];
1097
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1098
perror_plus("if_indextoname");
1100
fprintf_plus(stderr, "Skipping server on non-used interface"
1102
if_indextoname((unsigned int)if_index,
1110
ret = init_gnutls_session(&session, mc);
681
fprintf(stderr, "Mandos plugin mandos-client: "
682
"Setting up a TCP connection to %s, port %" PRIu16
1116
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1117
PRIuMAX "\n", ip, (uintmax_t)port);
686
tcp_sd = socket(pf, SOCK_STREAM, 0);
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
689
1123
perror_plus("socket");
752
1179
if(if_indextoname((unsigned int)if_index, interface) == NULL){
753
1180
perror_plus("if_indextoname");
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%%%s, port %" PRIuMAX
1183
"\n", ip, interface, (uintmax_t)port);
760
fprintf(stderr, "Mandos plugin mandos-client: "
761
"Connection to: %s, port %" PRIu16 "\n", ip, port);
1186
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1187
ip, (uintmax_t)port);
763
1189
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
764
1190
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
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");
1192
ret = getnameinfo((struct sockaddr *)&to,
1193
sizeof(struct sockaddr_in6),
1194
addrstr, sizeof(addrstr), NULL, 0,
1197
ret = getnameinfo((struct sockaddr *)&to,
1198
sizeof(struct sockaddr_in),
1199
addrstr, sizeof(addrstr), NULL, 0,
1202
if(ret == EAI_SYSTEM){
1203
perror_plus("getnameinfo");
1204
} else if(ret != 0) {
1205
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1206
} else if(strcmp(addrstr, ip) != 0){
1207
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1218
ret = connect(tcp_sd, (struct sockaddr *)&to,
1219
sizeof(struct sockaddr_in6));
1221
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1222
sizeof(struct sockaddr_in));
1225
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1226
and if_index != AVAHI_IF_UNSPEC
1227
and connect_to == NULL
1228
and not route_added and
1229
((af == AF_INET6 and not
1230
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1232
or (af == AF_INET and
1233
/* Not a a IPv4LL address */
1234
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1235
& 0xFFFF0000L) != 0xA9FE0000L))){
1236
/* Work around Avahi bug - Avahi does not announce link-local
1237
addresses if it has a global address, so local hosts with
1238
*only* a link-local address (e.g. Mandos clients) cannot
1239
connect to a Mandos server announced by Avahi on a server
1240
host with a global address. Work around this by retrying
1241
with an explicit route added with the server's address.
1243
Avahi bug reference:
1244
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
https://bugs.debian.org/587961
1248
fprintf_plus(stderr, "Mandos server unreachable, trying"
1252
route_added = add_local_route(ip, if_index);
1258
if(errno != ECONNREFUSED or debug){
1260
perror_plus("connect");
807
1273
const char *out = mandos_protocol_version;
1051
1536
char ip[AVAHI_ADDRESS_STR_MAX];
1052
1537
avahi_address_snprint(ip, sizeof(ip), address);
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);
1539
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1540
PRIdMAX ") on port %" PRIu16 "\n", name,
1541
host_name, ip, (intmax_t)interface, port);
1059
int ret = start_mandos_communication(ip, port, interface,
1060
avahi_proto_to_af(proto));
1543
int ret = start_mandos_communication(ip, (in_port_t)port,
1545
avahi_proto_to_af(proto),
1062
avahi_simple_poll_quit(mc.simple_poll);
1548
avahi_simple_poll_quit(simple_poll);
1064
ret = add_server(ip, port, interface,
1065
avahi_proto_to_af(proto));
1550
if(not add_server(ip, (in_port_t)port, interface,
1551
avahi_proto_to_af(proto),
1552
&((mandos_context*)mc)->current_server)){
1553
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1134
1628
signal_received = sig;
1135
1629
int old_errno = errno;
1136
1630
/* set main loop to exit */
1137
if(mc.simple_poll != NULL){
1138
avahi_simple_poll_quit(mc.simple_poll);
1631
if(simple_poll != NULL){
1632
avahi_simple_poll_quit(simple_poll);
1140
1634
errno = old_errno;
1637
__attribute__((nonnull, warn_unused_result))
1143
1638
bool get_flags(const char *ifname, struct ifreq *ifr){
1146
1642
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1148
1645
perror_plus("socket");
1151
strcpy(ifr->ifr_name, ifname);
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1152
1651
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1155
1655
perror_plus("ioctl SIOCGIFFLAGS");
1663
__attribute__((nonnull, warn_unused_result))
1162
1664
bool good_flags(const char *ifname, const struct ifreq *ifr){
1164
1666
/* Reject the loopback device */
1165
1667
if(ifr->ifr_flags & IFF_LOOPBACK){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Rejecting loopback interface \"%s\"\n", ifname);
1669
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1172
1674
/* Accept point-to-point devices only if connect_to is specified */
1173
1675
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Accepting point-to-point interface \"%s\"\n", ifname);
1677
fprintf_plus(stderr, "Accepting point-to-point interface"
1678
" \"%s\"\n", ifname);
1180
1682
/* Otherwise, reject non-broadcast-capable devices */
1181
1683
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1685
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1686
" \"%s\"\n", ifname);
1188
1690
/* Reject non-ARP interfaces (including dummy interfaces) */
1189
1691
if(ifr->ifr_flags & IFF_NOARP){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Rejecting non-ARP interface \"%s\"\n", ifname);
1693
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1197
1699
/* Accept this device */
1199
fprintf(stderr, "Mandos plugin mandos-client: "
1200
"Interface \"%s\" is good\n", ifname);
1701
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1215
1717
struct ifreq ifr;
1216
1718
if(not get_flags(if_entry->d_name, &ifr)){
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)){
1720
fprintf_plus(stderr, "Failed to get flags for interface "
1721
"\"%s\"\n", if_entry->d_name);
1726
if(not good_flags(if_entry->d_name, &ifr)){
1733
* This function determines if a network interface is up.
1735
__attribute__((nonnull, warn_unused_result))
1736
bool interface_is_up(const char *interface){
1738
if(not get_flags(interface, &ifr)){
1740
fprintf_plus(stderr, "Failed to get flags for interface "
1741
"\"%s\"\n", interface);
1746
return (bool)(ifr.ifr_flags & IFF_UP);
1750
* This function determines if a network interface is running
1752
__attribute__((nonnull, warn_unused_result))
1753
bool interface_is_running(const char *interface){
1755
if(not get_flags(interface, &ifr)){
1757
fprintf_plus(stderr, "Failed to get flags for interface "
1758
"\"%s\"\n", interface);
1763
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1766
__attribute__((nonnull, pure, warn_unused_result))
1277
1767
int notdotentries(const struct dirent *direntry){
1278
1768
/* Skip "." and ".." */
1279
1769
if(direntry->d_name[0] == '.'
1327
1810
if(not (S_ISREG(st.st_mode))){
1328
1811
/* Not a regular file */
1330
fprintf(stderr, "Mandos plugin mandos-client: "
1331
"Ignoring hook \"%s\" - not a file\n",
1813
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1336
1818
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1337
1819
/* Not executable */
1339
fprintf(stderr, "Mandos plugin mandos-client: "
1340
"Ignoring hook \"%s\" - not executable\n",
1821
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1827
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1348
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1833
__attribute__((nonnull, warn_unused_result))
1834
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1835
mandos_context *mc){
1350
1837
struct timespec now;
1351
1838
struct timespec waited_time;
1352
1839
intmax_t block_time;
1355
if(mc.current_server == NULL){
1357
fprintf(stderr, "Mandos plugin mandos-client: "
1358
"Wait until first server is found. No timeout!\n");
1842
if(mc->current_server == NULL){
1844
fprintf_plus(stderr, "Wait until first server is found."
1360
1847
ret = avahi_simple_poll_iterate(s, -1);
1363
fprintf(stderr, "Mandos plugin mandos-client: "
1364
"Check current_server if we should run it,"
1850
fprintf_plus(stderr, "Check current_server if we should run"
1367
1853
/* the current time */
1368
1854
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1411
1897
ret = avahi_simple_poll_iterate(s, (int)block_time);
1414
if (ret > 0 or errno != EINTR){
1900
if(ret > 0 or errno != EINTR){
1415
1901
return (ret != 1) ? ret : 0;
1907
__attribute__((nonnull))
1908
void run_network_hooks(const char *mode, const char *interface,
1910
struct dirent **direntries = NULL;
1911
if(hookdir_fd == -1){
1912
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1914
if(hookdir_fd == -1){
1915
if(errno == ENOENT){
1917
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1918
" found\n", hookdir);
1921
perror_plus("open");
1926
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1927
runnable_hook, alphasort);
1929
perror_plus("scandir");
1932
struct dirent *direntry;
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1939
for(int i = 0; i < numhooks; i++){
1940
direntry = direntries[i];
1942
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1945
pid_t hook_pid = fork();
1948
/* Raise privileges */
1949
errno = raise_privileges_permanently();
1951
perror_plus("Failed to raise privileges");
1958
perror_plus("setgid");
1961
/* Reset supplementary groups */
1963
ret = setgroups(0, NULL);
1965
perror_plus("setgroups");
1968
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1970
perror_plus("setenv");
1973
ret = setenv("DEVICE", interface, 1);
1975
perror_plus("setenv");
1978
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1980
perror_plus("setenv");
1983
ret = setenv("MODE", mode, 1);
1985
perror_plus("setenv");
1989
ret = asprintf(&delaystring, "%f", (double)delay);
1991
perror_plus("asprintf");
1994
ret = setenv("DELAY", delaystring, 1);
1997
perror_plus("setenv");
2001
if(connect_to != NULL){
2002
ret = setenv("CONNECT", connect_to, 1);
2004
perror_plus("setenv");
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2012
perror_plus("openat");
2013
_exit(EXIT_FAILURE);
2015
if(close(hookdir_fd) == -1){
2016
perror_plus("close");
2017
_exit(EXIT_FAILURE);
2019
ret = dup2(devnull, STDIN_FILENO);
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
2024
ret = close(devnull);
2026
perror_plus("close");
2029
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2031
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2034
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2036
perror_plus("fexecve");
2037
_exit(EXIT_FAILURE);
2041
perror_plus("fork");
2046
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2047
perror_plus("waitpid");
2051
if(WIFEXITED(status)){
2052
if(WEXITSTATUS(status) != 0){
2053
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2054
" with status %d\n", direntry->d_name,
2055
WEXITSTATUS(status));
2059
} else if(WIFSIGNALED(status)){
2060
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2061
" signal %d\n", direntry->d_name,
2066
fprintf_plus(stderr, "Warning: network hook \"%s\""
2067
" crashed\n", direntry->d_name);
2073
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2079
if(close(hookdir_fd) == -1){
2080
perror_plus("close");
2087
__attribute__((nonnull, warn_unused_result))
2088
int bring_up_interface(const char *const interface,
2090
int old_errno = errno;
2092
struct ifreq network;
2093
unsigned int if_index = if_nametoindex(interface);
2095
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2105
if(not interface_is_up(interface)){
2107
int ioctl_errno = 0;
2108
if(not get_flags(interface, &network)){
2110
fprintf_plus(stderr, "Failed to get flags for interface "
2111
"\"%s\"\n", interface);
2115
network.ifr_flags |= IFF_UP; /* set flag */
2117
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2120
perror_plus("socket");
2128
perror_plus("close");
2135
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2139
/* Raise privileges */
2140
ret_errno = raise_privileges();
2143
perror_plus("Failed to raise privileges");
2148
bool restore_loglevel = false;
2150
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2151
messages about the network interface to mess up the prompt */
2152
ret_linux = klogctl(8, NULL, 5);
2153
if(ret_linux == -1){
2154
perror_plus("klogctl");
2156
restore_loglevel = true;
2159
#endif /* __linux__ */
2160
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2161
ioctl_errno = errno;
2163
if(restore_loglevel){
2164
ret_linux = klogctl(7, NULL, 0);
2165
if(ret_linux == -1){
2166
perror_plus("klogctl");
2169
#endif /* __linux__ */
2171
/* If raise_privileges() succeeded above */
2173
/* Lower privileges */
2174
ret_errno = lower_privileges();
2177
perror_plus("Failed to lower privileges");
2181
/* Close the socket */
2184
perror_plus("close");
2187
if(ret_setflags == -1){
2188
errno = ioctl_errno;
2189
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2194
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2198
/* Sleep checking until interface is running.
2199
Check every 0.25s, up to total time of delay */
2200
for(int i = 0; i < delay * 4; i++){
2201
if(interface_is_running(interface)){
2204
struct timespec sleeptime = { .tv_nsec = 250000000 };
2205
ret = nanosleep(&sleeptime, NULL);
2206
if(ret == -1 and errno != EINTR){
2207
perror_plus("nanosleep");
2215
__attribute__((nonnull, warn_unused_result))
2216
int take_down_interface(const char *const interface){
2217
int old_errno = errno;
2218
struct ifreq network;
2219
unsigned int if_index = if_nametoindex(interface);
2221
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2225
if(interface_is_up(interface)){
2227
int ioctl_errno = 0;
2228
if(not get_flags(interface, &network) and debug){
2230
fprintf_plus(stderr, "Failed to get flags for interface "
2231
"\"%s\"\n", interface);
2235
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2237
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2240
perror_plus("socket");
2246
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2250
/* Raise privileges */
2251
ret_errno = raise_privileges();
2254
perror_plus("Failed to raise privileges");
2257
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2258
ioctl_errno = errno;
2260
/* If raise_privileges() succeeded above */
2262
/* Lower privileges */
2263
ret_errno = lower_privileges();
2266
perror_plus("Failed to lower privileges");
2270
/* Close the socket */
2271
int ret = close(sd);
2273
perror_plus("close");
2276
if(ret_setflags == -1){
2277
errno = ioctl_errno;
2278
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2283
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1421
2291
int main(int argc, char *argv[]){
2292
mandos_context mc = { .server = NULL, .dh_bits = 0,
2293
.priority = "SECURE256:!CTYPE-X.509"
2294
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2295
.current_server = NULL, .interfaces = NULL,
2296
.interfaces_size = 0 };
1422
2297
AvahiSServiceBrowser *sb = NULL;
1425
2300
intmax_t tmpmax;
1427
2302
int exitcode = EXIT_SUCCESS;
1428
const char *interface = "";
1429
struct ifreq network;
1431
bool take_down_interface = false;
1434
char tempdir[] = "/tmp/mandosXXXXXX";
1435
bool tempdir_created = false;
2303
char *interfaces_to_take_down = NULL;
2304
size_t interfaces_to_take_down_size = 0;
2305
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2306
char old_tempdir[] = "/tmp/mandosXXXXXX";
2307
char *tempdir = NULL;
1436
2308
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1437
2309
const char *seckey = PATHDIR "/" SECKEY;
1438
2310
const char *pubkey = PATHDIR "/" PUBKEY;
2311
const char *dh_params_file = NULL;
2312
char *interfaces_hooks = NULL;
1440
2314
bool gnutls_initialized = false;
1441
2315
bool gpgme_initialized = false;
1616
2501
/* Work around Debian bug #633582:
1617
<http://bugs.debian.org/633582> */
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");
2502
<https://bugs.debian.org/633582> */
2504
/* Re-raise privileges */
2505
ret = raise_privileges();
2508
perror_plus("Failed to raise privileges");
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",
2512
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2513
int seckey_fd = open(seckey, O_RDONLY);
2514
if(seckey_fd == -1){
2515
perror_plus("open");
2517
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2519
perror_plus("fstat");
2521
if(S_ISREG(st.st_mode)
2522
and st.st_uid == 0 and st.st_gid == 0){
2523
ret = fchown(seckey_fd, uid, gid);
2525
perror_plus("fchown");
2533
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2534
int pubkey_fd = open(pubkey, O_RDONLY);
2535
if(pubkey_fd == -1){
2536
perror_plus("open");
2538
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2540
perror_plus("fstat");
2542
if(S_ISREG(st.st_mode)
2543
and st.st_uid == 0 and st.st_gid == 0){
2544
ret = fchown(pubkey_fd, uid, gid);
2546
perror_plus("fchown");
2554
if(dh_params_file != NULL
2555
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2556
int dhparams_fd = open(dh_params_file, O_RDONLY);
2557
if(dhparams_fd == -1){
2558
perror_plus("open");
2560
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2562
perror_plus("fstat");
2564
if(S_ISREG(st.st_mode)
2565
and st.st_uid == 0 and st.st_gid == 0){
2566
ret = fchown(dhparams_fd, uid, gid);
2568
perror_plus("fchown");
2576
/* Lower privileges */
2577
ret = lower_privileges();
2580
perror_plus("Failed to lower privileges");
2585
/* Remove invalid interface names (except "none") */
2587
char *interface = NULL;
2588
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2590
if(strcmp(interface, "none") != 0
2591
and if_nametoindex(interface) == 0){
2592
if(interface[0] != '\0'){
2593
fprintf_plus(stderr, "Not using nonexisting interface"
2594
" \"%s\"\n", interface);
2596
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2602
/* Run network hooks */
2604
if(mc.interfaces != NULL){
2605
interfaces_hooks = malloc(mc.interfaces_size);
2606
if(interfaces_hooks == NULL){
2607
perror_plus("malloc");
2610
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2611
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2613
run_network_hooks("start", interfaces_hooks != NULL ?
2614
interfaces_hooks : "", delay);
1775
2618
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;
1812
2621
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1813
2622
from the signal handler */
1814
2623
/* Initialize the pseudo-RNG for Avahi */
1815
2624
srand((unsigned int) time(NULL));
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");
2625
simple_poll = avahi_simple_poll_new();
2626
if(simple_poll == NULL){
2627
fprintf_plus(stderr,
2628
"Avahi: Failed to create simple poll object.\n");
1820
2629
exitcode = EX_UNAVAILABLE;
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");
2696
/* If no interfaces were specified, make a list */
2697
if(mc.interfaces == NULL){
2698
struct dirent **direntries = NULL;
2699
/* Look for any good interfaces */
2700
ret = scandir(sys_class_net, &direntries, good_interface,
2703
/* Add all found interfaces to interfaces list */
2704
for(int i = 0; i < ret; ++i){
2705
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2706
direntries[i]->d_name);
2709
perror_plus("argz_add");
2710
free(direntries[i]);
2714
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2715
direntries[i]->d_name);
2717
free(direntries[i]);
2724
fprintf_plus(stderr, "Could not find a network interface\n");
2725
exitcode = EXIT_FAILURE;
2730
/* Bring up interfaces which are down, and remove any "none"s */
2732
char *interface = NULL;
2733
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2735
/* If interface name is "none", stop bringing up interfaces.
2736
Also remove all instances of "none" from the list */
2737
if(strcmp(interface, "none") == 0){
2738
argz_delete(&mc.interfaces, &mc.interfaces_size,
2741
while((interface = argz_next(mc.interfaces,
2742
mc.interfaces_size, interface))){
2743
if(strcmp(interface, "none") == 0){
2744
argz_delete(&mc.interfaces, &mc.interfaces_size,
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");
2025
/* Lower privileges permanently */
2028
perror_plus("setuid");
2751
bool interface_was_up = interface_is_up(interface);
2752
errno = bring_up_interface(interface, delay);
2753
if(not interface_was_up){
2755
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2756
" %s\n", interface, strerror(errno));
2758
errno = argz_add(&interfaces_to_take_down,
2759
&interfaces_to_take_down_size,
2762
perror_plus("argz_add");
2767
if(debug and (interfaces_to_take_down == NULL)){
2768
fprintf_plus(stderr, "No interfaces were brought up\n");
2772
/* If we only got one interface, explicitly use only that one */
2773
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2775
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2778
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2037
ret = init_gnutls_global(pubkey, seckey);
2785
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2039
fprintf(stderr, "Mandos plugin mandos-client: "
2040
"init_gnutls_global failed\n");
2787
fprintf_plus(stderr, "init_gnutls_global failed\n");
2041
2788
exitcode = EX_UNAVAILABLE;
2195
2947
/* Run the main loop */
2198
fprintf(stderr, "Mandos plugin mandos-client: "
2199
"Starting Avahi loop search\n");
2950
fprintf_plus(stderr, "Starting Avahi loop search\n");
2202
ret = avahi_loop_with_timeout(mc.simple_poll,
2203
(int)(retry_interval * 1000));
2953
ret = avahi_loop_with_timeout(simple_poll,
2954
(int)(retry_interval * 1000), &mc);
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"avahi_loop_with_timeout exited %s\n",
2207
(ret == 0) ? "successfully" : "with error");
2956
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2957
(ret == 0) ? "successfully" : "with error");
2213
fprintf(stderr, "Mandos plugin mandos-client: "
2214
"%s exiting\n", argv[0]);
2963
if(signal_received){
2964
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2965
argv[0], signal_received,
2966
strsignal(signal_received));
2968
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2217
2972
/* Cleanup things */
2973
free(mc.interfaces);
2219
2976
avahi_s_service_browser_free(sb);
2221
2978
if(mc.server != NULL)
2222
2979
avahi_server_free(mc.server);
2224
if(mc.simple_poll != NULL)
2225
avahi_simple_poll_free(mc.simple_poll);
2981
if(simple_poll != NULL)
2982
avahi_simple_poll_free(simple_poll);
2227
2984
if(gnutls_initialized){
2228
2985
gnutls_certificate_free_credentials(mc.cred);
2229
gnutls_global_deinit();
2230
2986
gnutls_dh_params_deinit(mc.dh_params);
2233
2989
if(gpgme_initialized){
2234
2990
gpgme_release(mc.ctx);
2237
2993
/* Cleans up the circular linked list of Mandos servers the client
2239
2995
if(mc.current_server != NULL){
2240
2996
mc.current_server->prev->next = NULL;
2241
2997
while(mc.current_server != NULL){
2242
2998
server *next = mc.current_server->next;
3000
#pragma GCC diagnostic push
3001
#pragma GCC diagnostic ignored "-Wcast-qual"
3003
free((char *)(mc.current_server->ip));
3005
#pragma GCC diagnostic pop
2243
3007
free(mc.current_server);
2244
3008
mc.current_server = next;
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");
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");
3012
/* Re-raise privileges */
3014
ret = raise_privileges();
3017
perror_plus("Failed to raise privileges");
3020
/* Run network hooks */
3021
run_network_hooks("stop", interfaces_hooks != NULL ?
3022
interfaces_hooks : "", delay);
3024
/* Take down the network interfaces which were brought up */
3026
char *interface = NULL;
3027
while((interface = argz_next(interfaces_to_take_down,
3028
interfaces_to_take_down_size,
3030
ret = take_down_interface(interface);
3033
perror_plus("Failed to take down interface");
3036
if(debug and (interfaces_to_take_down == NULL)){
3037
fprintf_plus(stderr, "No interfaces needed to be taken"
3043
ret = lower_privileges_permanently();
3046
perror_plus("Failed to lower privileges permanently");
3050
free(interfaces_to_take_down);
3051
free(interfaces_hooks);
3053
void clean_dir_at(int base, const char * const dirname,
3055
struct dirent **direntries = NULL;
3057
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3063
perror_plus("open");
3065
int numentries = scandirat(dir_fd, ".", &direntries,
3066
notdotentries, alphasort);
3067
if(numentries >= 0){
3068
for(int i = 0; i < numentries; i++){
3070
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3071
dirname, direntries[i]->d_name);
3073
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3075
if(errno == EISDIR){
3076
dret = unlinkat(dir_fd, direntries[i]->d_name,
3079
if((dret == -1) and (errno == ENOTEMPTY)
3080
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3081
== 0) and (level == 0)){
3082
/* Recurse only in this special case */
3083
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3087
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3088
direntries[i]->d_name, strerror(errno));
3091
free(direntries[i]);
3094
/* need to clean even if 0 because man page doesn't specify */
3096
if(numentries == -1){
3097
perror_plus("scandirat");
3099
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3100
if(dret == -1 and errno != ENOENT){
3101
perror_plus("rmdir");
3104
perror_plus("scandirat");
2282
3109
/* Removes the GPGME temp directory and all files inside */
2283
if(tempdir_created){
2284
struct dirent **direntries = NULL;
2285
struct dirent *direntry = NULL;
2286
int numentries = scandir(tempdir, &direntries, notdotentries,
2288
if (numentries > 0){
2289
for(int i = 0; i < numentries; i++){
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");
3110
if(tempdir != NULL){
3111
clean_dir_at(-1, tempdir, 0);