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(), strsignal()
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
52
51
#include <sys/ioctl.h> /* ioctl */
53
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
54
53
sockaddr_in6, PF_INET6,
57
56
#include <sys/stat.h> /* open(), S_ISREG */
58
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
59
inet_pton(), connect(),
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
62
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
71
66
program_invocation_short_name */
72
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
171
153
const char *priority;
173
155
server *current_server;
175
size_t interfaces_size;
176
156
} mandos_context;
178
/* global so signal handler can reach it*/
179
AvahiSimplePoll *simple_poll;
158
/* global context so signal handler can reach it*/
159
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
181
164
sig_atomic_t quit_now = 0;
182
165
int signal_received = 0;
184
167
/* Function to use when printing errors */
185
168
void perror_plus(const char *print_text){
187
169
fprintf(stderr, "Mandos plugin %s: ",
188
170
program_invocation_short_name);
190
171
perror(print_text);
193
__attribute__((format (gnu_printf, 2, 3), nonnull))
194
int fprintf_plus(FILE *stream, const char *format, ...){
196
va_start (ap, format);
198
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
199
program_invocation_short_name));
200
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
204
175
* Make additional room in "buffer" for at least BUFFER_SIZE more
205
176
* bytes. "buffer_capacity" is how much is currently allocated,
206
177
* "buffer_length" is how much is already used.
208
__attribute__((nonnull, warn_unused_result))
209
179
size_t incbuffer(char **buffer, size_t buffer_length,
210
size_t buffer_capacity){
180
size_t buffer_capacity){
211
181
if(buffer_length + BUFFER_SIZE > buffer_capacity){
212
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
int old_errno = errno;
182
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
221
186
buffer_capacity += BUFFER_SIZE;
223
188
return buffer_capacity;
226
191
/* Add server to set of servers to retry periodically */
227
__attribute__((nonnull, warn_unused_result))
228
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
229
int af, server **current_server){
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
231
196
server *new_server = malloc(sizeof(server));
232
197
if(new_server == NULL){
233
198
perror_plus("malloc");
236
201
*new_server = (server){ .ip = strdup(ip),
238
.if_index = if_index,
203
.if_index = if_index,
240
205
if(new_server->ip == NULL){
241
206
perror_plus("strdup");
245
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
perror_plus("clock_gettime");
249
#pragma GCC diagnostic push
250
#pragma GCC diagnostic ignored "-Wcast-qual"
252
free((char *)(new_server->ip));
254
#pragma GCC diagnostic pop
259
209
/* Special case of first server */
260
if(*current_server == NULL){
210
if (mc.current_server == NULL){
261
211
new_server->next = new_server;
262
212
new_server->prev = new_server;
263
*current_server = new_server;
213
mc.current_server = new_server;
214
/* Place the new server last in the list */
265
/* Place the new server last in the list */
266
new_server->next = *current_server;
267
new_server->prev = (*current_server)->prev;
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
268
218
new_server->prev->next = new_server;
269
(*current_server)->prev = new_server;
219
mc.current_server->prev = new_server;
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
223
perror_plus("clock_gettime");
275
230
* Initialize GPGME.
277
__attribute__((nonnull, warn_unused_result))
278
static bool init_gpgme(const char * const seckey,
279
const char * const pubkey,
280
const char * const tempdir,
232
static bool init_gpgme(const char *seckey,
233
const char *pubkey, const char *tempdir){
282
234
gpgme_error_t rc;
283
235
gpgme_engine_info_t engine_info;
286
239
* Helper function to insert pub and seckey to the engine keyring.
288
bool import_key(const char * const filename){
241
bool import_key(const char *filename){
291
244
gpgme_data_t pgp_data;
384
333
ssize_t plaintext_length = 0;
387
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
390
339
/* Create new GPGME data buffer from memory cryptotext */
391
340
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
393
342
if(rc != GPG_ERR_NO_ERROR){
394
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
395
gpgme_strsource(rc), gpgme_strerror(rc));
343
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
344
gpgme_strsource(rc), gpgme_strerror(rc));
399
348
/* Create new empty GPGME data buffer for the plaintext */
400
349
rc = gpgme_data_new(&dh_plain);
401
350
if(rc != GPG_ERR_NO_ERROR){
402
fprintf_plus(stderr, "Mandos plugin mandos-client: "
403
"bad gpgme_data_new: %s: %s\n",
404
gpgme_strsource(rc), gpgme_strerror(rc));
351
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
405
353
gpgme_data_release(dh_crypto);
409
357
/* Decrypt data from the cryptotext data buffer to the plaintext
411
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
412
360
if(rc != GPG_ERR_NO_ERROR){
413
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
414
gpgme_strsource(rc), gpgme_strerror(rc));
361
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
415
363
plaintext_length = -1;
417
365
gpgme_decrypt_result_t result;
418
result = gpgme_op_decrypt_result(mc->ctx);
366
result = gpgme_op_decrypt_result(mc.ctx);
419
367
if(result == NULL){
420
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
422
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
423
result->unsupported_algorithm);
424
fprintf_plus(stderr, "Wrong key usage: %u\n",
425
result->wrong_key_usage);
370
fprintf(stderr, "Unsupported algorithm: %s\n",
371
result->unsupported_algorithm);
372
fprintf(stderr, "Wrong key usage: %u\n",
373
result->wrong_key_usage);
426
374
if(result->file_name != NULL){
427
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
fprintf(stderr, "File name: %s\n", result->file_name);
429
377
gpgme_recipient_t recipient;
430
378
recipient = result->recipients;
431
379
while(recipient != NULL){
432
fprintf_plus(stderr, "Public key algorithm: %s\n",
433
gpgme_pubkey_algo_name
434
(recipient->pubkey_algo));
435
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
436
fprintf_plus(stderr, "Secret key available: %s\n",
437
recipient->status == GPG_ERR_NO_SECKEY
380
fprintf(stderr, "Public key algorithm: %s\n",
381
gpgme_pubkey_algo_name(recipient->pubkey_algo));
382
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
383
fprintf(stderr, "Secret key available: %s\n",
384
recipient->status == GPG_ERR_NO_SECKEY
439
386
recipient = recipient->next;
498
445
return plaintext_length;
501
__attribute__((warn_unused_result, const))
502
static const char *safe_string(const char *str){
508
__attribute__((warn_unused_result))
509
static const char *safer_gnutls_strerror(int value){
510
const char *ret = gnutls_strerror(value);
511
return safe_string(ret);
448
static const char * safer_gnutls_strerror(int value){
449
const char *ret = gnutls_strerror(value); /* Spurious warning from
450
-Wunreachable-code */
514
456
/* GnuTLS log function callback */
515
__attribute__((nonnull))
516
457
static void debuggnutls(__attribute__((unused)) int level,
517
458
const char* string){
518
fprintf_plus(stderr, "GnuTLS: %s", string);
459
fprintf(stderr, "GnuTLS: %s", string);
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
522
462
static int init_gnutls_global(const char *pubkeyfilename,
523
const char *seckeyfilename,
524
const char *dhparamsfilename,
463
const char *seckeyfilename){
530
fprintf_plus(stderr, "Initializing GnuTLS\n");
467
fprintf(stderr, "Initializing GnuTLS\n");
470
ret = gnutls_global_init();
471
if(ret != GNUTLS_E_SUCCESS){
472
fprintf(stderr, "GnuTLS global_init: %s\n",
473
safer_gnutls_strerror(ret));
541
485
/* OpenPGP credentials */
542
ret = gnutls_certificate_allocate_credentials(&mc->cred);
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
543
487
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
safer_gnutls_strerror(ret));
488
fprintf(stderr, "GnuTLS memory error: %s\n",
489
safer_gnutls_strerror(ret));
490
gnutls_global_deinit();
550
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
551
" secret key %s as GnuTLS credentials\n",
495
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
496
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
556
500
ret = gnutls_certificate_set_openpgp_key_file
557
(mc->cred, pubkeyfilename, seckeyfilename,
501
(mc.cred, pubkeyfilename, seckeyfilename,
558
502
GNUTLS_OPENPGP_FMT_BASE64);
559
503
if(ret != GNUTLS_E_SUCCESS){
561
"Error[%d] while reading the OpenPGP key pair ('%s',"
562
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
563
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
564
safer_gnutls_strerror(ret));
505
"Error[%d] while reading the OpenPGP key pair ('%s',"
506
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
507
fprintf(stderr, "The GnuTLS error is: %s\n",
508
safer_gnutls_strerror(ret));
568
512
/* GnuTLS server initialization */
569
ret = gnutls_dh_params_init(&mc->dh_params);
570
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
572
" initialization: %s\n",
573
safer_gnutls_strerror(ret));
576
/* If a Diffie-Hellman parameters file was given, try to use it */
577
if(dhparamsfilename != NULL){
578
gnutls_datum_t params = { .data = NULL, .size = 0 };
580
int dhpfile = open(dhparamsfilename, O_RDONLY);
583
dhparamsfilename = NULL;
586
size_t params_capacity = 0;
588
params_capacity = incbuffer((char **)¶ms.data,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
592
perror_plus("incbuffer");
595
dhparamsfilename = NULL;
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
605
/* check bytes_read for failure */
610
dhparamsfilename = NULL;
613
params.size += (unsigned int)bytes_read;
615
if(params.data == NULL){
616
dhparamsfilename = NULL;
618
if(dhparamsfilename == NULL){
621
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
622
GNUTLS_X509_FMT_PEM);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Failed to parse DH parameters in file"
625
" \"%s\": %s\n", dhparamsfilename,
626
safer_gnutls_strerror(ret));
627
dhparamsfilename = NULL;
632
if(dhparamsfilename == NULL){
633
if(mc->dh_bits == 0){
634
/* Find out the optimal number of DH bits */
635
/* Try to read the private key file */
636
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
638
int secfile = open(seckeyfilename, O_RDONLY);
643
size_t buffer_capacity = 0;
645
buffer_capacity = incbuffer((char **)&buffer.data,
647
(size_t)buffer_capacity);
648
if(buffer_capacity == 0){
649
perror_plus("incbuffer");
654
ssize_t bytes_read = read(secfile,
655
buffer.data + buffer.size,
661
/* check bytes_read for failure */
668
buffer.size += (unsigned int)bytes_read;
672
/* If successful, use buffer to parse private key */
673
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
674
if(buffer.data != NULL){
676
gnutls_openpgp_privkey_t privkey = NULL;
677
ret = gnutls_openpgp_privkey_init(&privkey);
678
if(ret != GNUTLS_E_SUCCESS){
679
fprintf_plus(stderr, "Error initializing OpenPGP key"
681
safer_gnutls_strerror(ret));
685
ret = gnutls_openpgp_privkey_import
686
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
687
if(ret != GNUTLS_E_SUCCESS){
688
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
689
safer_gnutls_strerror(ret));
695
/* Use private key to suggest an appropriate
697
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
698
gnutls_openpgp_privkey_deinit(privkey);
700
fprintf_plus(stderr, "This OpenPGP key implies using"
701
" a GnuTLS security parameter \"%s\".\n",
702
safe_string(gnutls_sec_param_get_name
708
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
709
/* Err on the side of caution */
710
sec_param = GNUTLS_SEC_PARAM_ULTRA;
712
fprintf_plus(stderr, "Falling back to security parameter"
714
safe_string(gnutls_sec_param_get_name
719
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
723
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
724
" implies %u DH bits; using that.\n",
725
safe_string(gnutls_sec_param_get_name
730
fprintf_plus(stderr, "Failed to get implied number of DH"
731
" bits for security parameter \"%s\"): %s\n",
732
safe_string(gnutls_sec_param_get_name
734
safer_gnutls_strerror(ret));
738
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
742
if(ret != GNUTLS_E_SUCCESS){
743
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
744
" bits): %s\n", mc->dh_bits,
745
safer_gnutls_strerror(ret));
749
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
513
ret = gnutls_dh_params_init(&mc.dh_params);
514
if(ret != GNUTLS_E_SUCCESS){
515
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
516
" %s\n", safer_gnutls_strerror(ret));
519
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
520
if(ret != GNUTLS_E_SUCCESS){
521
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
522
safer_gnutls_strerror(ret));
526
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
755
gnutls_certificate_free_credentials(mc->cred);
756
gnutls_dh_params_deinit(mc->dh_params);
532
gnutls_certificate_free_credentials(mc.cred);
533
gnutls_global_deinit();
534
gnutls_dh_params_deinit(mc.dh_params);
760
__attribute__((nonnull, warn_unused_result))
761
static int init_gnutls_session(gnutls_session_t *session,
538
static int init_gnutls_session(gnutls_session_t *session){
764
540
/* GnuTLS session creation */
817
594
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
818
595
__attribute__((unused)) const char *txt){}
820
/* Set effective uid to 0, return errno */
821
__attribute__((warn_unused_result))
822
int raise_privileges(void){
823
int old_errno = errno;
825
if(seteuid(0) == -1){
832
/* Set effective and real user ID to 0. Return errno. */
833
__attribute__((warn_unused_result))
834
int raise_privileges_permanently(void){
835
int old_errno = errno;
836
int ret = raise_privileges();
848
/* Set effective user ID to unprivileged saved user ID */
849
__attribute__((warn_unused_result))
850
int lower_privileges(void){
851
int old_errno = errno;
853
if(seteuid(uid) == -1){
860
/* Lower privileges permanently */
861
__attribute__((warn_unused_result))
862
int lower_privileges_permanently(void){
863
int old_errno = errno;
865
if(setuid(uid) == -1){
872
/* Helper function to add_local_route() and delete_local_route() */
873
__attribute__((nonnull, warn_unused_result))
874
static bool add_delete_local_route(const bool add,
876
AvahiIfIndex if_index){
878
char helper[] = "mandos-client-iprouteadddel";
879
char add_arg[] = "add";
880
char delete_arg[] = "delete";
881
char debug_flag[] = "--debug";
882
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
883
if(pluginhelperdir == NULL){
885
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
886
" variable not set; cannot run helper\n");
891
char interface[IF_NAMESIZE];
892
if(if_indextoname((unsigned int)if_index, interface) == NULL){
893
perror_plus("if_indextoname");
897
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
899
perror_plus("open(\"/dev/null\", O_RDONLY)");
905
/* Raise privileges */
906
errno = raise_privileges_permanently();
908
perror_plus("Failed to raise privileges");
909
/* _exit(EX_NOPERM); */
915
perror_plus("setgid");
918
/* Reset supplementary groups */
920
ret = setgroups(0, NULL);
922
perror_plus("setgroups");
926
ret = dup2(devnull, STDIN_FILENO);
928
perror_plus("dup2(devnull, STDIN_FILENO)");
931
ret = close(devnull);
933
perror_plus("close");
936
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
938
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
941
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
946
if(helperdir_fd == -1){
948
_exit(EX_UNAVAILABLE);
950
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
953
perror_plus("openat");
955
_exit(EX_UNAVAILABLE);
959
#pragma GCC diagnostic push
960
#pragma GCC diagnostic ignored "-Wcast-qual"
962
if(fexecve(helper_fd, (char *const [])
963
{ helper, add ? add_arg : delete_arg, (char *)address,
964
interface, debug ? debug_flag : NULL, NULL },
967
#pragma GCC diagnostic pop
969
perror_plus("fexecve");
981
pret = waitpid(pid, &status, 0);
982
if(pret == -1 and errno == EINTR and quit_now){
983
int errno_raising = 0;
984
if((errno = raise_privileges()) != 0){
985
errno_raising = errno;
986
perror_plus("Failed to raise privileges in order to"
987
" kill helper program");
989
if(kill(pid, SIGTERM) == -1){
992
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
993
perror_plus("Failed to lower privileges after killing"
998
} while(pret == -1 and errno == EINTR);
1000
perror_plus("waitpid");
1003
if(WIFEXITED(status)){
1004
if(WEXITSTATUS(status) != 0){
1005
fprintf_plus(stderr, "Error: iprouteadddel exited"
1006
" with status %d\n", WEXITSTATUS(status));
1011
if(WIFSIGNALED(status)){
1012
fprintf_plus(stderr, "Error: iprouteadddel died by"
1013
" signal %d\n", WTERMSIG(status));
1016
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1020
__attribute__((nonnull, warn_unused_result))
1021
static bool add_local_route(const char *address,
1022
AvahiIfIndex if_index){
1024
fprintf_plus(stderr, "Adding route to %s\n", address);
1026
return add_delete_local_route(true, address, if_index);
1029
__attribute__((nonnull, warn_unused_result))
1030
static bool delete_local_route(const char *address,
1031
AvahiIfIndex if_index){
1033
fprintf_plus(stderr, "Removing route to %s\n", address);
1035
return add_delete_local_route(false, address, if_index);
1038
597
/* Called when a Mandos server is found */
1039
__attribute__((nonnull, warn_unused_result))
1040
static int start_mandos_communication(const char *ip, in_port_t port,
598
static int start_mandos_communication(const char *ip, uint16_t port,
1041
599
AvahiIfIndex if_index,
1042
int af, mandos_context *mc){
1043
601
int ret, tcp_sd = -1;
1045
struct sockaddr_storage to;
604
struct sockaddr_in in;
605
struct sockaddr_in6 in6;
1046
607
char *buffer = NULL;
1047
608
char *decrypted_buffer = NULL;
1048
609
size_t buffer_length = 0;
1071
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
fprintf(stderr, "Bad address family: %d\n", af);
1076
/* If the interface is specified and we have a list of interfaces */
1077
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1078
/* Check if the interface is one of the interfaces we are using */
1081
char *interface = NULL;
1082
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1084
if(if_nametoindex(interface) == (unsigned int)if_index){
1091
/* This interface does not match any in the list, so we don't
1092
connect to the server */
1094
char interface[IF_NAMESIZE];
1095
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1096
perror_plus("if_indextoname");
1098
fprintf_plus(stderr, "Skipping server on non-used interface"
1100
if_indextoname((unsigned int)if_index,
1108
ret = init_gnutls_session(&session, mc);
636
ret = init_gnutls_session(&session);
1114
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1115
PRIuMAX "\n", ip, (uintmax_t)port);
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
1118
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
646
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
649
perror_plus("socket");
1177
710
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1178
711
perror_plus("if_indextoname");
1180
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1181
"\n", ip, interface, (uintmax_t)port);
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
1184
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1185
ip, (uintmax_t)port);
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
1187
720
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1188
721
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1190
ret = getnameinfo((struct sockaddr *)&to,
1191
sizeof(struct sockaddr_in6),
1192
addrstr, sizeof(addrstr), NULL, 0,
1195
ret = getnameinfo((struct sockaddr *)&to,
1196
sizeof(struct sockaddr_in),
1197
addrstr, sizeof(addrstr), NULL, 0,
1200
if(ret == EAI_SYSTEM){
1201
perror_plus("getnameinfo");
1202
} else if(ret != 0) {
1203
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1204
} else if(strcmp(addrstr, ip) != 0){
1205
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1216
ret = connect(tcp_sd, (struct sockaddr *)&to,
1217
sizeof(struct sockaddr_in6));
1219
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1220
sizeof(struct sockaddr_in));
1223
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1224
and if_index != AVAHI_IF_UNSPEC
1225
and connect_to == NULL
1226
and not route_added and
1227
((af == AF_INET6 and not
1228
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1230
or (af == AF_INET and
1231
/* Not a a IPv4LL address */
1232
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1233
& 0xFFFF0000L) != 0xA9FE0000L))){
1234
/* Work around Avahi bug - Avahi does not announce link-local
1235
addresses if it has a global address, so local hosts with
1236
*only* a link-local address (e.g. Mandos clients) cannot
1237
connect to a Mandos server announced by Avahi on a server
1238
host with a global address. Work around this by retrying
1239
with an explicit route added with the server's address.
1241
Avahi bug reference:
1242
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1243
https://bugs.debian.org/587961
1246
fprintf_plus(stderr, "Mandos server unreachable, trying"
1250
route_added = add_local_route(ip, if_index);
1256
if(errno != ECONNREFUSED or debug){
1258
perror_plus("connect");
724
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
727
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
731
perror_plus("inet_ntop");
733
if(strcmp(addrstr, ip) != 0){
734
fprintf(stderr, "Canonical address form: %s\n", addrstr);
745
ret = connect(tcp_sd, &to.in6, sizeof(to));
747
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
750
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
752
perror_plus("connect");
1271
763
const char *out = mandos_protocol_version;
1535
1001
char ip[AVAHI_ADDRESS_STR_MAX];
1536
1002
avahi_address_snprint(ip, sizeof(ip), address);
1538
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1539
PRIdMAX ") on port %" PRIu16 "\n", name,
1540
host_name, ip, (intmax_t)interface, port);
1004
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1005
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1006
ip, (intmax_t)interface, port);
1542
int ret = start_mandos_communication(ip, (in_port_t)port,
1544
avahi_proto_to_af(proto),
1008
int ret = start_mandos_communication(ip, port, interface,
1009
avahi_proto_to_af(proto));
1547
avahi_simple_poll_quit(simple_poll);
1011
avahi_simple_poll_quit(mc.simple_poll);
1549
if(not add_server(ip, (in_port_t)port, interface,
1550
avahi_proto_to_af(proto),
1551
&((mandos_context*)mc)->current_server)){
1552
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1627
1080
signal_received = sig;
1628
1081
int old_errno = errno;
1629
1082
/* set main loop to exit */
1630
if(simple_poll != NULL){
1631
avahi_simple_poll_quit(simple_poll);
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1633
1086
errno = old_errno;
1636
__attribute__((nonnull, warn_unused_result))
1637
1089
bool get_flags(const char *ifname, struct ifreq *ifr){
1641
1092
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1644
1094
perror_plus("socket");
1648
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1649
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1097
strcpy(ifr->ifr_name, ifname);
1650
1098
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1654
1101
perror_plus("ioctl SIOCGIFFLAGS");
1662
__attribute__((nonnull, warn_unused_result))
1663
1108
bool good_flags(const char *ifname, const struct ifreq *ifr){
1665
1110
/* Reject the loopback device */
1666
1111
if(ifr->ifr_flags & IFF_LOOPBACK){
1668
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1673
1118
/* Accept point-to-point devices only if connect_to is specified */
1674
1119
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1676
fprintf_plus(stderr, "Accepting point-to-point interface"
1677
" \"%s\"\n", ifname);
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1681
1126
/* Otherwise, reject non-broadcast-capable devices */
1682
1127
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1684
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1685
" \"%s\"\n", ifname);
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1689
1134
/* Reject non-ARP interfaces (including dummy interfaces) */
1690
1135
if(ifr->ifr_flags & IFF_NOARP){
1692
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1698
1142
/* Accept this device */
1700
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1716
1159
struct ifreq ifr;
1717
1160
if(not get_flags(if_entry->d_name, &ifr)){
1719
fprintf_plus(stderr, "Failed to get flags for interface "
1720
"\"%s\"\n", if_entry->d_name);
1725
if(not good_flags(if_entry->d_name, &ifr)){
1732
* This function determines if a network interface is up.
1734
__attribute__((nonnull, warn_unused_result))
1735
bool interface_is_up(const char *interface){
1737
if(not get_flags(interface, &ifr)){
1739
fprintf_plus(stderr, "Failed to get flags for interface "
1740
"\"%s\"\n", interface);
1745
return (bool)(ifr.ifr_flags & IFF_UP);
1749
* This function determines if a network interface is running
1751
__attribute__((nonnull, warn_unused_result))
1752
bool interface_is_running(const char *interface){
1754
if(not get_flags(interface, &ifr)){
1756
fprintf_plus(stderr, "Failed to get flags for interface "
1757
"\"%s\"\n", interface);
1762
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1765
__attribute__((nonnull, pure, warn_unused_result))
1162
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1168
if(not good_flags(if_entry->d_name, &ifr)){
1175
* This function determines if a directory entry in /sys/class/net
1176
* corresponds to an acceptable network device which is up.
1177
* (This function is passed to scandir(3) as a filter function.)
1179
int up_interface(const struct dirent *if_entry){
1180
if(if_entry->d_name[0] == '.'){
1185
if(not get_flags(if_entry->d_name, &ifr)){
1187
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1193
/* Reject down interfaces */
1194
if(not (ifr.ifr_flags & IFF_UP)){
1196
fprintf(stderr, "Rejecting down interface \"%s\"\n",
1202
/* Reject non-running interfaces */
1203
if(not (ifr.ifr_flags & IFF_RUNNING)){
1205
fprintf(stderr, "Rejecting non-running interface \"%s\"\n",
1211
if(not good_flags(if_entry->d_name, &ifr)){
1766
1217
int notdotentries(const struct dirent *direntry){
1767
1218
/* Skip "." and ".." */
1768
1219
if(direntry->d_name[0] == '.'
1789
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1790
"abcdefghijklmnopqrstuvwxyz"
1793
if((direntry->d_name)[sret] != '\0'){
1794
/* Contains non-allowed characters */
1796
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1802
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1238
/* Save pointer to last character */
1239
char *end = strchr(direntry->d_name, '\0')-1;
1246
if(((direntry->d_name)[0] == '#')
1248
/* Temporary #name# */
1252
/* XXX more rules here */
1254
ret = stat(direntry->d_name, &st);
1805
perror_plus("Could not stat hook");
1257
perror_plus("Could not stat plugin");
1809
1261
if(not (S_ISREG(st.st_mode))){
1810
1262
/* Not a regular file */
1812
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1817
1265
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1818
1266
/* Not executable */
1820
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1826
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1832
__attribute__((nonnull, warn_unused_result))
1833
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1834
mandos_context *mc){
1272
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1836
1274
struct timespec now;
1837
1275
struct timespec waited_time;
1838
1276
intmax_t block_time;
1841
if(mc->current_server == NULL){
1843
fprintf_plus(stderr, "Wait until first server is found."
1279
if(mc.current_server == NULL){
1282
"Wait until first server is found. No timeout!\n");
1846
1284
ret = avahi_simple_poll_iterate(s, -1);
1849
fprintf_plus(stderr, "Check current_server if we should run"
1287
fprintf(stderr, "Check current_server if we should run it,"
1852
1290
/* the current time */
1853
1291
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1896
1333
ret = avahi_simple_poll_iterate(s, (int)block_time);
1899
if(ret > 0 or errno != EINTR){
1336
if (ret > 0 or errno != EINTR) {
1900
1337
return (ret != 1) ? ret : 0;
1906
__attribute__((nonnull))
1907
void run_network_hooks(const char *mode, const char *interface,
1909
struct dirent **direntries = NULL;
1910
if(hookdir_fd == -1){
1911
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1913
if(hookdir_fd == -1){
1914
if(errno == ENOENT){
1916
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1917
" found\n", hookdir);
1920
perror_plus("open");
1925
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1926
runnable_hook, alphasort);
1928
perror_plus("scandir");
1931
struct dirent *direntry;
1933
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1935
perror_plus("open(\"/dev/null\", O_RDONLY)");
1938
for(int i = 0; i < numhooks; i++){
1939
direntry = direntries[i];
1941
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1944
pid_t hook_pid = fork();
1947
/* Raise privileges */
1948
errno = raise_privileges_permanently();
1950
perror_plus("Failed to raise privileges");
1957
perror_plus("setgid");
1960
/* Reset supplementary groups */
1962
ret = setgroups(0, NULL);
1964
perror_plus("setgroups");
1967
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1969
perror_plus("setenv");
1972
ret = setenv("DEVICE", interface, 1);
1974
perror_plus("setenv");
1977
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1979
perror_plus("setenv");
1982
ret = setenv("MODE", mode, 1);
1984
perror_plus("setenv");
1988
ret = asprintf(&delaystring, "%f", (double)delay);
1990
perror_plus("asprintf");
1993
ret = setenv("DELAY", delaystring, 1);
1996
perror_plus("setenv");
2000
if(connect_to != NULL){
2001
ret = setenv("CONNECT", connect_to, 1);
2003
perror_plus("setenv");
2007
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2011
perror_plus("openat");
2012
_exit(EXIT_FAILURE);
2014
if(close(hookdir_fd) == -1){
2015
perror_plus("close");
2016
_exit(EXIT_FAILURE);
2018
ret = dup2(devnull, STDIN_FILENO);
2020
perror_plus("dup2(devnull, STDIN_FILENO)");
2023
ret = close(devnull);
2025
perror_plus("close");
2028
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2030
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2033
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2035
perror_plus("fexecve");
2036
_exit(EXIT_FAILURE);
2040
perror_plus("fork");
2045
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2046
perror_plus("waitpid");
2050
if(WIFEXITED(status)){
2051
if(WEXITSTATUS(status) != 0){
2052
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2053
" with status %d\n", direntry->d_name,
2054
WEXITSTATUS(status));
2058
} else if(WIFSIGNALED(status)){
2059
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2060
" signal %d\n", direntry->d_name,
2065
fprintf_plus(stderr, "Warning: network hook \"%s\""
2066
" crashed\n", direntry->d_name);
2072
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2078
if(close(hookdir_fd) == -1){
2079
perror_plus("close");
2086
__attribute__((nonnull, warn_unused_result))
2087
int bring_up_interface(const char *const interface,
2089
int old_errno = errno;
2091
struct ifreq network;
2092
unsigned int if_index = if_nametoindex(interface);
2094
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2104
if(not interface_is_up(interface)){
2106
int ioctl_errno = 0;
2107
if(not get_flags(interface, &network)){
2109
fprintf_plus(stderr, "Failed to get flags for interface "
2110
"\"%s\"\n", interface);
2114
network.ifr_flags |= IFF_UP; /* set flag */
2116
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2119
perror_plus("socket");
2127
perror_plus("close");
2134
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2138
/* Raise privileges */
2139
ret_errno = raise_privileges();
2142
perror_plus("Failed to raise privileges");
2147
bool restore_loglevel = false;
2149
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2150
messages about the network interface to mess up the prompt */
2151
ret_linux = klogctl(8, NULL, 5);
2152
if(ret_linux == -1){
2153
perror_plus("klogctl");
2155
restore_loglevel = true;
2158
#endif /* __linux__ */
2159
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2160
ioctl_errno = errno;
2162
if(restore_loglevel){
2163
ret_linux = klogctl(7, NULL, 0);
2164
if(ret_linux == -1){
2165
perror_plus("klogctl");
2168
#endif /* __linux__ */
2170
/* If raise_privileges() succeeded above */
2172
/* Lower privileges */
2173
ret_errno = lower_privileges();
2176
perror_plus("Failed to lower privileges");
2180
/* Close the socket */
2183
perror_plus("close");
2186
if(ret_setflags == -1){
2187
errno = ioctl_errno;
2188
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2193
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2197
/* Sleep checking until interface is running.
2198
Check every 0.25s, up to total time of delay */
2199
for(int i=0; i < delay * 4; i++){
2200
if(interface_is_running(interface)){
2203
struct timespec sleeptime = { .tv_nsec = 250000000 };
2204
ret = nanosleep(&sleeptime, NULL);
2205
if(ret == -1 and errno != EINTR){
2206
perror_plus("nanosleep");
2214
__attribute__((nonnull, warn_unused_result))
2215
int take_down_interface(const char *const interface){
2216
int old_errno = errno;
2217
struct ifreq network;
2218
unsigned int if_index = if_nametoindex(interface);
2220
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2224
if(interface_is_up(interface)){
2226
int ioctl_errno = 0;
2227
if(not get_flags(interface, &network) and debug){
2229
fprintf_plus(stderr, "Failed to get flags for interface "
2230
"\"%s\"\n", interface);
2234
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2236
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2239
perror_plus("socket");
2245
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2249
/* Raise privileges */
2250
ret_errno = raise_privileges();
2253
perror_plus("Failed to raise privileges");
2256
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2257
ioctl_errno = errno;
2259
/* If raise_privileges() succeeded above */
2261
/* Lower privileges */
2262
ret_errno = lower_privileges();
2265
perror_plus("Failed to lower privileges");
2269
/* Close the socket */
2270
int ret = close(sd);
2272
perror_plus("close");
2275
if(ret_setflags == -1){
2276
errno = ioctl_errno;
2277
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2282
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2290
1343
int main(int argc, char *argv[]){
2291
mandos_context mc = { .server = NULL, .dh_bits = 0,
2292
.priority = "SECURE256:!CTYPE-X.509"
2293
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2294
.current_server = NULL, .interfaces = NULL,
2295
.interfaces_size = 0 };
2296
1344
AvahiSServiceBrowser *sb = NULL;
2299
1347
intmax_t tmpmax;
2301
1349
int exitcode = EXIT_SUCCESS;
2302
char *interfaces_to_take_down = NULL;
2303
size_t interfaces_to_take_down_size = 0;
2304
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2305
char old_tempdir[] = "/tmp/mandosXXXXXX";
2306
char *tempdir = NULL;
1350
const char *interface = "";
1351
struct ifreq network;
1353
bool take_down_interface = false;
1356
char tempdir[] = "/tmp/mandosXXXXXX";
1357
bool tempdir_created = false;
2307
1358
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2308
1359
const char *seckey = PATHDIR "/" SECKEY;
2309
1360
const char *pubkey = PATHDIR "/" PUBKEY;
2310
const char *dh_params_file = NULL;
2311
char *interfaces_hooks = NULL;
2313
1362
bool gnutls_initialized = false;
2314
1363
bool gpgme_initialized = false;
2500
1530
/* Work around Debian bug #633582:
2501
<https://bugs.debian.org/633582> */
2503
/* Re-raise privileges */
2504
ret = raise_privileges();
2507
perror_plus("Failed to raise privileges");
2511
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2512
int seckey_fd = open(seckey, O_RDONLY);
2513
if(seckey_fd == -1){
2514
perror_plus("open");
2516
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2518
perror_plus("fstat");
2520
if(S_ISREG(st.st_mode)
2521
and st.st_uid == 0 and st.st_gid == 0){
2522
ret = fchown(seckey_fd, uid, gid);
2524
perror_plus("fchown");
2532
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2533
int pubkey_fd = open(pubkey, O_RDONLY);
2534
if(pubkey_fd == -1){
2535
perror_plus("open");
2537
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2539
perror_plus("fstat");
2541
if(S_ISREG(st.st_mode)
2542
and st.st_uid == 0 and st.st_gid == 0){
2543
ret = fchown(pubkey_fd, uid, gid);
2545
perror_plus("fchown");
2553
if(dh_params_file != NULL
2554
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2555
int dhparams_fd = open(dh_params_file, O_RDONLY);
2556
if(dhparams_fd == -1){
2557
perror_plus("open");
2559
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2561
perror_plus("fstat");
2563
if(S_ISREG(st.st_mode)
2564
and st.st_uid == 0 and st.st_gid == 0){
2565
ret = fchown(dhparams_fd, uid, gid);
2567
perror_plus("fchown");
2575
/* Lower privileges */
2576
ret = lower_privileges();
2579
perror_plus("Failed to lower privileges");
2584
/* Remove invalid interface names (except "none") */
2586
char *interface = NULL;
2587
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2589
if(strcmp(interface, "none") != 0
2590
and if_nametoindex(interface) == 0){
2591
if(interface[0] != '\0'){
2592
fprintf_plus(stderr, "Not using nonexisting interface"
2593
" \"%s\"\n", interface);
2595
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2601
/* Run network hooks */
2603
if(mc.interfaces != NULL){
2604
interfaces_hooks = malloc(mc.interfaces_size);
2605
if(interfaces_hooks == NULL){
2606
perror_plus("malloc");
1531
<http://bugs.debian.org/633582> */
1534
/* Re-raise priviliges */
1538
perror_plus("seteuid");
1541
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1542
int seckey_fd = open(seckey, O_RDONLY);
1543
if(seckey_fd == -1){
1544
perror_plus("open");
1546
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1548
perror_plus("fstat");
1550
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1551
ret = fchown(seckey_fd, uid, gid);
1553
perror_plus("fchown");
1557
TEMP_FAILURE_RETRY(close(seckey_fd));
1561
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1562
int pubkey_fd = open(pubkey, O_RDONLY);
1563
if(pubkey_fd == -1){
1564
perror_plus("open");
1566
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1568
perror_plus("fstat");
1570
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1571
ret = fchown(pubkey_fd, uid, gid);
1573
perror_plus("fchown");
1577
TEMP_FAILURE_RETRY(close(pubkey_fd));
1581
/* Lower privileges */
1585
perror_plus("seteuid");
1589
/* Find network hooks and run them */
1591
struct dirent **direntries;
1592
struct dirent *direntry;
1593
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1595
int devnull = open("/dev/null", O_RDONLY);
1596
for(int i = 0; i < numhooks; i++){
1597
direntry = direntries[0];
1598
char *fullname = NULL;
1599
ret = asprintf(&fullname, "%s/%s", tempdir,
1602
perror_plus("asprintf");
1605
pid_t hook_pid = fork();
1608
dup2(devnull, STDIN_FILENO);
1610
dup2(STDERR_FILENO, STDOUT_FILENO);
1611
ret = setenv("DEVICE", interface, 1);
1613
perror_plus("setenv");
1616
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1618
perror_plus("setenv");
1621
ret = setenv("MODE", "start", 1);
1623
perror_plus("setenv");
1627
ret = asprintf(&delaystring, "%f", delay);
1629
perror_plus("asprintf");
1632
ret = setenv("DELAY", delaystring, 1);
1635
perror_plus("setenv");
1639
ret = execl(fullname, direntry->d_name, "start", NULL);
1640
perror_plus("execl");
2609
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2610
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2612
run_network_hooks("start", interfaces_hooks != NULL ?
2613
interfaces_hooks : "", delay);
2617
1651
avahi_set_log_function(empty_log);
1654
if(interface[0] == '\0'){
1655
struct dirent **direntries;
1656
/* First look for interfaces that are up */
1657
ret = scandir(sys_class_net, &direntries, up_interface,
1660
/* No up interfaces, look for any good interfaces */
1662
ret = scandir(sys_class_net, &direntries, good_interface,
1666
/* Pick the first interface returned */
1667
interface = strdup(direntries[0]->d_name);
1669
fprintf(stderr, "Using interface \"%s\"\n", interface);
1671
if(interface == NULL){
1672
perror_plus("malloc");
1674
exitcode = EXIT_FAILURE;
1680
fprintf(stderr, "Could not find a network interface\n");
1681
exitcode = EXIT_FAILURE;
2620
1686
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2621
1687
from the signal handler */
2622
1688
/* Initialize the pseudo-RNG for Avahi */
2623
1689
srand((unsigned int) time(NULL));
2624
simple_poll = avahi_simple_poll_new();
2625
if(simple_poll == NULL){
2626
fprintf_plus(stderr,
2627
"Avahi: Failed to create simple poll object.\n");
1690
mc.simple_poll = avahi_simple_poll_new();
1691
if(mc.simple_poll == NULL){
1692
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2628
1693
exitcode = EX_UNAVAILABLE;
2695
/* If no interfaces were specified, make a list */
2696
if(mc.interfaces == NULL){
2697
struct dirent **direntries = NULL;
2698
/* Look for any good interfaces */
2699
ret = scandir(sys_class_net, &direntries, good_interface,
2702
/* Add all found interfaces to interfaces list */
2703
for(int i = 0; i < ret; ++i){
2704
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2705
direntries[i]->d_name);
2708
perror_plus("argz_add");
2709
free(direntries[i]);
2713
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2714
direntries[i]->d_name);
2716
free(direntries[i]);
1760
/* If the interface is down, bring it up */
1761
if(strcmp(interface, "none") != 0){
1762
if_index = (AvahiIfIndex) if_nametoindex(interface);
1764
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1765
exitcode = EX_UNAVAILABLE;
1773
/* Re-raise priviliges */
1777
perror_plus("seteuid");
1781
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1782
messages about the network interface to mess up the prompt */
1783
ret = klogctl(8, NULL, 5);
1784
bool restore_loglevel = true;
1786
restore_loglevel = false;
1787
perror_plus("klogctl");
1789
#endif /* __linux__ */
1791
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1793
perror_plus("socket");
1794
exitcode = EX_OSERR;
1796
if(restore_loglevel){
1797
ret = klogctl(7, NULL, 0);
1799
perror_plus("klogctl");
1802
#endif /* __linux__ */
1803
/* Lower privileges */
1807
perror_plus("seteuid");
1811
strcpy(network.ifr_name, interface);
1812
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1814
perror_plus("ioctl SIOCGIFFLAGS");
1816
if(restore_loglevel){
1817
ret = klogctl(7, NULL, 0);
1819
perror_plus("klogctl");
1822
#endif /* __linux__ */
1823
exitcode = EX_OSERR;
1824
/* Lower privileges */
1828
perror_plus("seteuid");
1832
if((network.ifr_flags & IFF_UP) == 0){
1833
network.ifr_flags |= IFF_UP;
1834
take_down_interface = true;
1835
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1837
take_down_interface = false;
1838
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1839
exitcode = EX_OSERR;
1841
if(restore_loglevel){
1842
ret = klogctl(7, NULL, 0);
1844
perror_plus("klogctl");
1847
#endif /* __linux__ */
1848
/* Lower privileges */
1852
perror_plus("seteuid");
1857
/* Sleep checking until interface is running.
1858
Check every 0.25s, up to total time of delay */
1859
for(int i=0; i < delay * 4; i++){
1860
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1862
perror_plus("ioctl SIOCGIFFLAGS");
1863
} else if(network.ifr_flags & IFF_RUNNING){
1866
struct timespec sleeptime = { .tv_nsec = 250000000 };
1867
ret = nanosleep(&sleeptime, NULL);
1868
if(ret == -1 and errno != EINTR){
1869
perror_plus("nanosleep");
1872
if(not take_down_interface){
1873
/* We won't need the socket anymore */
1874
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1876
perror_plus("close");
1880
if(restore_loglevel){
1881
/* Restores kernel loglevel to default */
1882
ret = klogctl(7, NULL, 0);
1884
perror_plus("klogctl");
1887
#endif /* __linux__ */
1888
/* Lower privileges */
1890
if(take_down_interface){
1891
/* Lower privileges */
1894
perror_plus("seteuid");
2723
fprintf_plus(stderr, "Could not find a network interface\n");
2724
exitcode = EXIT_FAILURE;
2729
/* Bring up interfaces which are down, and remove any "none"s */
2731
char *interface = NULL;
2732
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2734
/* If interface name is "none", stop bringing up interfaces.
2735
Also remove all instances of "none" from the list */
2736
if(strcmp(interface, "none") == 0){
2737
argz_delete(&mc.interfaces, &mc.interfaces_size,
2740
while((interface = argz_next(mc.interfaces,
2741
mc.interfaces_size, interface))){
2742
if(strcmp(interface, "none") == 0){
2743
argz_delete(&mc.interfaces, &mc.interfaces_size,
2750
bool interface_was_up = interface_is_up(interface);
2751
errno = bring_up_interface(interface, delay);
2752
if(not interface_was_up){
2754
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2755
" %s\n", interface, strerror(errno));
2757
errno = argz_add(&interfaces_to_take_down,
2758
&interfaces_to_take_down_size,
2761
perror_plus("argz_add");
2766
if(debug and (interfaces_to_take_down == NULL)){
2767
fprintf_plus(stderr, "No interfaces were brought up\n");
2771
/* If we only got one interface, explicitly use only that one */
2772
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2774
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2777
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1897
/* Lower privileges permanently */
1900
perror_plus("setuid");
2784
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1909
ret = init_gnutls_global(pubkey, seckey);
2786
fprintf_plus(stderr, "init_gnutls_global failed\n");
1911
fprintf(stderr, "init_gnutls_global failed\n");
2787
1912
exitcode = EX_UNAVAILABLE;
2946
2061
/* Run the main loop */
2949
fprintf_plus(stderr, "Starting Avahi loop search\n");
2064
fprintf(stderr, "Starting Avahi loop search\n");
2952
ret = avahi_loop_with_timeout(simple_poll,
2953
(int)(retry_interval * 1000), &mc);
2067
ret = avahi_loop_with_timeout(mc.simple_poll,
2068
(int)(retry_interval * 1000));
2955
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2956
(ret == 0) ? "successfully" : "with error");
2070
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2071
(ret == 0) ? "successfully" : "with error");
2962
if(signal_received){
2963
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2964
argv[0], signal_received,
2965
strsignal(signal_received));
2967
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2077
fprintf(stderr, "%s exiting\n", argv[0]);
2971
2080
/* Cleanup things */
2972
free(mc.interfaces);
2975
2082
avahi_s_service_browser_free(sb);
2977
2084
if(mc.server != NULL)
2978
2085
avahi_server_free(mc.server);
2980
if(simple_poll != NULL)
2981
avahi_simple_poll_free(simple_poll);
2087
if(mc.simple_poll != NULL)
2088
avahi_simple_poll_free(mc.simple_poll);
2983
2090
if(gnutls_initialized){
2984
2091
gnutls_certificate_free_credentials(mc.cred);
2092
gnutls_global_deinit();
2985
2093
gnutls_dh_params_deinit(mc.dh_params);
2988
2096
if(gpgme_initialized){
2989
2097
gpgme_release(mc.ctx);
2992
2100
/* Cleans up the circular linked list of Mandos servers the client
2994
2102
if(mc.current_server != NULL){
2995
2103
mc.current_server->prev->next = NULL;
2996
2104
while(mc.current_server != NULL){
2997
2105
server *next = mc.current_server->next;
2999
#pragma GCC diagnostic push
3000
#pragma GCC diagnostic ignored "-Wcast-qual"
3002
free((char *)(mc.current_server->ip));
3004
#pragma GCC diagnostic pop
3006
2106
free(mc.current_server);
3007
2107
mc.current_server = next;
3011
/* Re-raise privileges */
3013
ret = raise_privileges();
3016
perror_plus("Failed to raise privileges");
3019
/* Run network hooks */
3020
run_network_hooks("stop", interfaces_hooks != NULL ?
3021
interfaces_hooks : "", delay);
3023
/* Take down the network interfaces which were brought up */
3025
char *interface = NULL;
3026
while((interface=argz_next(interfaces_to_take_down,
3027
interfaces_to_take_down_size,
3029
ret = take_down_interface(interface);
3032
perror_plus("Failed to take down interface");
3035
if(debug and (interfaces_to_take_down == NULL)){
3036
fprintf_plus(stderr, "No interfaces needed to be taken"
2111
/* XXX run network hooks "stop" here */
2113
/* Take down the network interface */
2114
if(take_down_interface){
2115
/* Re-raise priviliges */
2119
perror_plus("seteuid");
3042
ret = lower_privileges_permanently();
3045
perror_plus("Failed to lower privileges permanently");
2122
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2124
perror_plus("ioctl SIOCGIFFLAGS");
2125
} else if(network.ifr_flags & IFF_UP) {
2126
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2127
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2129
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2132
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2134
perror_plus("close");
2136
/* Lower privileges permanently */
2140
perror_plus("setuid");
3049
free(interfaces_to_take_down);
3050
free(interfaces_hooks);
3052
void clean_dir_at(int base, const char * const dirname,
2145
/* Removes the GPGME temp directory and all files inside */
2146
if(tempdir_created){
3054
2147
struct dirent **direntries = NULL;
3056
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3062
perror_plus("open");
3064
int numentries = scandirat(dir_fd, ".", &direntries,
3065
notdotentries, alphasort);
3066
if(numentries >= 0){
2148
struct dirent *direntry = NULL;
2149
int numentries = scandir(tempdir, &direntries, notdotentries,
2151
if (numentries > 0){
3067
2152
for(int i = 0; i < numentries; i++){
3069
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3070
dirname, direntries[i]->d_name);
3072
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3074
if(errno == EISDIR){
3075
dret = unlinkat(dir_fd, direntries[i]->d_name,
3078
if((dret == -1) and (errno == ENOTEMPTY)
3079
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3080
== 0) and (level == 0)){
3081
/* Recurse only in this special case */
3082
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3086
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3087
direntries[i]->d_name, strerror(errno));
3090
free(direntries[i]);
3093
/* need to clean even if 0 because man page doesn't specify */
3095
if(numentries == -1){
3096
perror_plus("scandirat");
3098
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3099
if(dret == -1 and errno != ENOENT){
3100
perror_plus("rmdir");
3103
perror_plus("scandirat");
3108
/* Removes the GPGME temp directory and all files inside */
3109
if(tempdir != NULL){
3110
clean_dir_at(-1, tempdir, 0);
2153
direntry = direntries[i];
2154
char *fullname = NULL;
2155
ret = asprintf(&fullname, "%s/%s", tempdir,
2158
perror_plus("asprintf");
2161
ret = remove(fullname);
2163
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2170
/* need to clean even if 0 because man page doesn't specify */
2172
if (numentries == -1){
2173
perror_plus("scandir");
2175
ret = rmdir(tempdir);
2176
if(ret == -1 and errno != ENOENT){
2177
perror_plus("rmdir");