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
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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 */
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45
#include <stddef.h> /* NULL, size_t, ssize_t */
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46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
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strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
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52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
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sockaddr_in6, PF_INET6,
56
56
#include <sys/stat.h> /* open(), S_ISREG */
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57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
60
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
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62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
65
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
66
EAI_SYSTEM, ENETUNREACH,
67
EHOSTUNREACH, ECONNREFUSED, EPROTO,
68
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
70
66
program_invocation_short_name */
71
67
#include <time.h> /* nanosleep(), time(), sleep() */
72
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
170
156
const char *priority;
172
158
server *current_server;
174
size_t interfaces_size;
175
159
} mandos_context;
177
/* global so signal handler can reach it*/
178
AvahiSimplePoll *simple_poll;
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
180
167
sig_atomic_t quit_now = 0;
181
168
int signal_received = 0;
183
170
/* Function to use when printing errors */
184
171
void perror_plus(const char *print_text){
186
172
fprintf(stderr, "Mandos plugin %s: ",
187
173
program_invocation_short_name);
189
174
perror(print_text);
192
__attribute__((format (gnu_printf, 2, 3), nonnull))
193
int fprintf_plus(FILE *stream, const char *format, ...){
195
va_start (ap, format);
197
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
198
program_invocation_short_name));
199
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
203
178
* Make additional room in "buffer" for at least BUFFER_SIZE more
204
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* bytes. "buffer_capacity" is how much is currently allocated,
205
180
* "buffer_length" is how much is already used.
207
__attribute__((nonnull, warn_unused_result))
208
182
size_t incbuffer(char **buffer, size_t buffer_length,
209
183
size_t buffer_capacity){
210
184
if(buffer_length + BUFFER_SIZE > buffer_capacity){
211
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
int old_errno = errno;
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
220
189
buffer_capacity += BUFFER_SIZE;
222
191
return buffer_capacity;
225
194
/* Add server to set of servers to retry periodically */
226
__attribute__((nonnull, warn_unused_result))
227
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
228
int af, server **current_server){
195
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
230
198
server *new_server = malloc(sizeof(server));
231
199
if(new_server == NULL){
232
200
perror_plus("malloc");
235
203
*new_server = (server){ .ip = strdup(ip),
239
207
if(new_server->ip == NULL){
240
208
perror_plus("strdup");
244
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
246
perror_plus("clock_gettime");
248
#pragma GCC diagnostic push
249
#pragma GCC diagnostic ignored "-Wcast-qual"
251
free((char *)(new_server->ip));
253
#pragma GCC diagnostic pop
258
211
/* Special case of first server */
259
if(*current_server == NULL){
212
if (mc.current_server == NULL){
260
213
new_server->next = new_server;
261
214
new_server->prev = new_server;
262
*current_server = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
264
/* Place the new server last in the list */
265
new_server->next = *current_server;
266
new_server->prev = (*current_server)->prev;
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
267
220
new_server->prev->next = new_server;
268
(*current_server)->prev = new_server;
221
mc.current_server->prev = new_server;
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
225
perror_plus("clock_gettime");
274
232
* Initialize GPGME.
276
__attribute__((nonnull, warn_unused_result))
277
static bool init_gpgme(const char * const seckey,
278
const char * const pubkey,
279
const char * const tempdir,
234
static bool init_gpgme(const char *seckey, const char *pubkey,
235
const char *tempdir){
281
236
gpgme_error_t rc;
282
237
gpgme_engine_info_t engine_info;
285
241
* Helper function to insert pub and seckey to the engine keyring.
287
bool import_key(const char * const filename){
243
bool import_key(const char *filename){
290
246
gpgme_data_t pgp_data;
383
342
ssize_t plaintext_length = 0;
386
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
389
349
/* Create new GPGME data buffer from memory cryptotext */
390
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rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
392
352
if(rc != GPG_ERR_NO_ERROR){
393
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
394
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
355
gpgme_strsource(rc), gpgme_strerror(rc));
398
359
/* Create new empty GPGME data buffer for the plaintext */
399
360
rc = gpgme_data_new(&dh_plain);
400
361
if(rc != GPG_ERR_NO_ERROR){
401
fprintf_plus(stderr, "Mandos plugin mandos-client: "
402
"bad gpgme_data_new: %s: %s\n",
403
gpgme_strsource(rc), gpgme_strerror(rc));
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
404
365
gpgme_data_release(dh_crypto);
408
369
/* Decrypt data from the cryptotext data buffer to the plaintext
410
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
411
372
if(rc != GPG_ERR_NO_ERROR){
412
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
413
gpgme_strsource(rc), gpgme_strerror(rc));
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
414
376
plaintext_length = -1;
416
378
gpgme_decrypt_result_t result;
417
result = gpgme_op_decrypt_result(mc->ctx);
379
result = gpgme_op_decrypt_result(mc.ctx);
418
380
if(result == NULL){
419
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
421
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
422
result->unsupported_algorithm);
423
fprintf_plus(stderr, "Wrong key usage: %u\n",
424
result->wrong_key_usage);
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
389
result->wrong_key_usage);
425
390
if(result->file_name != NULL){
426
fprintf_plus(stderr, "File name: %s\n", result->file_name);
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
428
394
gpgme_recipient_t recipient;
429
395
recipient = result->recipients;
430
396
while(recipient != NULL){
431
fprintf_plus(stderr, "Public key algorithm: %s\n",
432
gpgme_pubkey_algo_name
433
(recipient->pubkey_algo));
434
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
435
fprintf_plus(stderr, "Secret key available: %s\n",
436
recipient->status == GPG_ERR_NO_SECKEY
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
438
406
recipient = recipient->next;
497
467
return plaintext_length;
500
__attribute__((warn_unused_result, const))
501
static const char *safe_string(const char *str){
507
__attribute__((warn_unused_result))
508
static const char *safer_gnutls_strerror(int value){
509
const char *ret = gnutls_strerror(value);
510
return safe_string(ret);
470
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value); /* Spurious warning from
472
-Wunreachable-code */
513
478
/* GnuTLS log function callback */
514
__attribute__((nonnull))
515
479
static void debuggnutls(__attribute__((unused)) int level,
516
480
const char* string){
517
fprintf_plus(stderr, "GnuTLS: %s", string);
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
520
__attribute__((nonnull(1, 2, 4), warn_unused_result))
521
484
static int init_gnutls_global(const char *pubkeyfilename,
522
const char *seckeyfilename,
523
const char *dhparamsfilename,
485
const char *seckeyfilename){
529
fprintf_plus(stderr, "Initializing GnuTLS\n");
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
493
ret = gnutls_global_init();
494
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
540
508
/* OpenPGP credentials */
541
ret = gnutls_certificate_allocate_credentials(&mc->cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
542
510
if(ret != GNUTLS_E_SUCCESS){
543
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
544
safer_gnutls_strerror(ret));
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
513
gnutls_global_deinit();
549
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
550
" secret key %s as GnuTLS credentials\n",
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
555
524
ret = gnutls_certificate_set_openpgp_key_file
556
(mc->cred, pubkeyfilename, seckeyfilename,
525
(mc.cred, pubkeyfilename, seckeyfilename,
557
526
GNUTLS_OPENPGP_FMT_BASE64);
558
527
if(ret != GNUTLS_E_SUCCESS){
560
"Error[%d] while reading the OpenPGP key pair ('%s',"
561
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
562
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
563
safer_gnutls_strerror(ret));
529
"Mandos plugin mandos-client: "
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
567
537
/* GnuTLS server initialization */
568
ret = gnutls_dh_params_init(&mc->dh_params);
569
if(ret != GNUTLS_E_SUCCESS){
570
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
571
" initialization: %s\n",
572
safer_gnutls_strerror(ret));
575
/* If a Diffie-Hellman parameters file was given, try to use it */
576
if(dhparamsfilename != NULL){
577
gnutls_datum_t params = { .data = NULL, .size = 0 };
579
int dhpfile = open(dhparamsfilename, O_RDONLY);
582
dhparamsfilename = NULL;
585
size_t params_capacity = 0;
587
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params_capacity);
590
if(params_capacity == 0){
591
perror_plus("incbuffer");
594
dhparamsfilename = NULL;
597
ssize_t bytes_read = read(dhpfile,
598
params.data + params.size,
604
/* check bytes_read for failure */
609
dhparamsfilename = NULL;
612
params.size += (unsigned int)bytes_read;
614
if(params.data == NULL){
615
dhparamsfilename = NULL;
617
if(dhparamsfilename == NULL){
620
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
621
GNUTLS_X509_FMT_PEM);
622
if(ret != GNUTLS_E_SUCCESS){
623
fprintf_plus(stderr, "Failed to parse DH parameters in file"
624
" \"%s\": %s\n", dhparamsfilename,
625
safer_gnutls_strerror(ret));
626
dhparamsfilename = NULL;
630
if(dhparamsfilename == NULL){
631
if(mc->dh_bits == 0){
632
/* Find out the optimal number of DH bits */
633
/* Try to read the private key file */
634
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
636
int secfile = open(seckeyfilename, O_RDONLY);
641
size_t buffer_capacity = 0;
643
buffer_capacity = incbuffer((char **)&buffer.data,
645
(size_t)buffer_capacity);
646
if(buffer_capacity == 0){
647
perror_plus("incbuffer");
652
ssize_t bytes_read = read(secfile,
653
buffer.data + buffer.size,
659
/* check bytes_read for failure */
666
buffer.size += (unsigned int)bytes_read;
670
/* If successful, use buffer to parse private key */
671
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
672
if(buffer.data != NULL){
674
gnutls_openpgp_privkey_t privkey = NULL;
675
ret = gnutls_openpgp_privkey_init(&privkey);
676
if(ret != GNUTLS_E_SUCCESS){
677
fprintf_plus(stderr, "Error initializing OpenPGP key"
679
safer_gnutls_strerror(ret));
683
ret = gnutls_openpgp_privkey_import
684
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
687
safer_gnutls_strerror(ret));
693
/* Use private key to suggest an appropriate
695
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
696
gnutls_openpgp_privkey_deinit(privkey);
698
fprintf_plus(stderr, "This OpenPGP key implies using"
699
" a GnuTLS security parameter \"%s\".\n",
700
safe_string(gnutls_sec_param_get_name
706
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
707
/* Err on the side of caution */
708
sec_param = GNUTLS_SEC_PARAM_ULTRA;
710
fprintf_plus(stderr, "Falling back to security parameter"
712
safe_string(gnutls_sec_param_get_name
717
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
721
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
722
" implies %u DH bits; using that.\n",
723
safe_string(gnutls_sec_param_get_name
728
fprintf_plus(stderr, "Failed to get implied number of DH"
729
" bits for security parameter \"%s\"): %s\n",
730
safe_string(gnutls_sec_param_get_name
732
safer_gnutls_strerror(ret));
736
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
739
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
740
if(ret != GNUTLS_E_SUCCESS){
741
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
742
" bits): %s\n", mc->dh_bits,
743
safer_gnutls_strerror(ret));
747
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
538
ret = gnutls_dh_params_init(&mc.dh_params);
539
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
542
" %s\n", safer_gnutls_strerror(ret));
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
546
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
753
gnutls_certificate_free_credentials(mc->cred);
754
gnutls_dh_params_deinit(mc->dh_params);
559
gnutls_certificate_free_credentials(mc.cred);
560
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
758
__attribute__((nonnull, warn_unused_result))
759
static int init_gnutls_session(gnutls_session_t *session,
565
static int init_gnutls_session(gnutls_session_t *session){
762
567
/* GnuTLS session creation */
815
624
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
816
625
__attribute__((unused)) const char *txt){}
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
int raise_privileges(void){
821
int old_errno = errno;
823
if(seteuid(0) == -1){
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
int raise_privileges_permanently(void){
833
int old_errno = errno;
834
int ret = raise_privileges();
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
int lower_privileges(void){
849
int old_errno = errno;
851
if(seteuid(uid) == -1){
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
int lower_privileges_permanently(void){
861
int old_errno = errno;
863
if(setuid(uid) == -1){
870
/* Helper function to add_local_route() and delete_local_route() */
871
__attribute__((nonnull, warn_unused_result))
872
static bool add_delete_local_route(const bool add,
874
AvahiIfIndex if_index){
876
char helper[] = "mandos-client-iprouteadddel";
877
char add_arg[] = "add";
878
char delete_arg[] = "delete";
879
char debug_flag[] = "--debug";
880
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
881
if(pluginhelperdir == NULL){
883
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
884
" variable not set; cannot run helper\n");
889
char interface[IF_NAMESIZE];
890
if(if_indextoname((unsigned int)if_index, interface) == NULL){
891
perror_plus("if_indextoname");
895
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
897
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
/* Raise privileges */
904
errno = raise_privileges_permanently();
906
perror_plus("Failed to raise privileges");
907
/* _exit(EX_NOPERM); */
913
perror_plus("setgid");
916
/* Reset supplementary groups */
918
ret = setgroups(0, NULL);
920
perror_plus("setgroups");
924
ret = dup2(devnull, STDIN_FILENO);
926
perror_plus("dup2(devnull, STDIN_FILENO)");
929
ret = close(devnull);
931
perror_plus("close");
934
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
936
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
939
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
944
if(helperdir_fd == -1){
946
_exit(EX_UNAVAILABLE);
948
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
951
perror_plus("openat");
953
_exit(EX_UNAVAILABLE);
957
#pragma GCC diagnostic push
958
#pragma GCC diagnostic ignored "-Wcast-qual"
960
if(fexecve(helper_fd, (char *const [])
961
{ helper, add ? add_arg : delete_arg, (char *)address,
962
interface, debug ? debug_flag : NULL, NULL },
965
#pragma GCC diagnostic pop
967
perror_plus("fexecve");
979
pret = waitpid(pid, &status, 0);
980
if(pret == -1 and errno == EINTR and quit_now){
981
int errno_raising = 0;
982
if((errno = raise_privileges()) != 0){
983
errno_raising = errno;
984
perror_plus("Failed to raise privileges in order to"
985
" kill helper program");
987
if(kill(pid, SIGTERM) == -1){
990
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
991
perror_plus("Failed to lower privileges after killing"
996
} while(pret == -1 and errno == EINTR);
998
perror_plus("waitpid");
1001
if(WIFEXITED(status)){
1002
if(WEXITSTATUS(status) != 0){
1003
fprintf_plus(stderr, "Error: iprouteadddel exited"
1004
" with status %d\n", WEXITSTATUS(status));
1009
if(WIFSIGNALED(status)){
1010
fprintf_plus(stderr, "Error: iprouteadddel died by"
1011
" signal %d\n", WTERMSIG(status));
1014
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1018
__attribute__((nonnull, warn_unused_result))
1019
static bool add_local_route(const char *address,
1020
AvahiIfIndex if_index){
1022
fprintf_plus(stderr, "Adding route to %s\n", address);
1024
return add_delete_local_route(true, address, if_index);
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool delete_local_route(const char *address,
1029
AvahiIfIndex if_index){
1031
fprintf_plus(stderr, "Removing route to %s\n", address);
1033
return add_delete_local_route(false, address, if_index);
1036
627
/* Called when a Mandos server is found */
1037
__attribute__((nonnull, warn_unused_result))
1038
static int start_mandos_communication(const char *ip, in_port_t port,
628
static int start_mandos_communication(const char *ip, uint16_t port,
1039
629
AvahiIfIndex if_index,
1040
int af, mandos_context *mc){
1041
631
int ret, tcp_sd = -1;
1043
struct sockaddr_storage to;
634
struct sockaddr_in in;
635
struct sockaddr_in6 in6;
1044
637
char *buffer = NULL;
1045
638
char *decrypted_buffer = NULL;
1046
639
size_t buffer_length = 0;
1069
fprintf_plus(stderr, "Bad address family: %d\n", af);
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
1074
/* If the interface is specified and we have a list of interfaces */
1075
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1076
/* Check if the interface is one of the interfaces we are using */
1079
char *interface = NULL;
1080
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1082
if(if_nametoindex(interface) == (unsigned int)if_index){
1089
/* This interface does not match any in the list, so we don't
1090
connect to the server */
1092
char interface[IF_NAMESIZE];
1093
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1094
perror_plus("if_indextoname");
1096
fprintf_plus(stderr, "Skipping server on non-used interface"
1098
if_indextoname((unsigned int)if_index,
1106
ret = init_gnutls_session(&session, mc);
667
ret = init_gnutls_session(&session);
1112
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1113
PRIuMAX "\n", ip, (uintmax_t)port);
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
678
tcp_sd = socket(pf, SOCK_STREAM, 0);
1119
681
perror_plus("socket");
1175
744
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1176
745
perror_plus("if_indextoname");
1178
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1179
"\n", ip, interface, (uintmax_t)port);
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
1182
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1183
ip, (uintmax_t)port);
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
1185
755
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1186
756
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1188
ret = getnameinfo((struct sockaddr *)&to,
1189
sizeof(struct sockaddr_in6),
1190
addrstr, sizeof(addrstr), NULL, 0,
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in),
1195
addrstr, sizeof(addrstr), NULL, 0,
1198
if(ret == EAI_SYSTEM){
1199
perror_plus("getnameinfo");
1200
} else if(ret != 0) {
1201
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1202
} else if(strcmp(addrstr, ip) != 0){
1203
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1214
ret = connect(tcp_sd, (struct sockaddr *)&to,
1215
sizeof(struct sockaddr_in6));
1217
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1218
sizeof(struct sockaddr_in));
1221
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1222
and if_index != AVAHI_IF_UNSPEC
1223
and connect_to == NULL
1224
and not route_added and
1225
((af == AF_INET6 and not
1226
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1228
or (af == AF_INET and
1229
/* Not a a IPv4LL address */
1230
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1231
& 0xFFFF0000L) != 0xA9FE0000L))){
1232
/* Work around Avahi bug - Avahi does not announce link-local
1233
addresses if it has a global address, so local hosts with
1234
*only* a link-local address (e.g. Mandos clients) cannot
1235
connect to a Mandos server announced by Avahi on a server
1236
host with a global address. Work around this by retrying
1237
with an explicit route added with the server's address.
1239
Avahi bug reference:
1240
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1241
https://bugs.debian.org/587961
1244
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
route_added = add_local_route(ip, if_index);
1254
if(errno != ECONNREFUSED or debug){
1256
perror_plus("connect");
759
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
762
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
766
perror_plus("inet_ntop");
768
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
781
ret = connect(tcp_sd, &to.in6, sizeof(to));
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
788
perror_plus("connect");
1269
799
const char *out = mandos_protocol_version;
1533
1043
char ip[AVAHI_ADDRESS_STR_MAX];
1534
1044
avahi_address_snprint(ip, sizeof(ip), address);
1536
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1537
PRIdMAX ") on port %" PRIu16 "\n", name,
1538
host_name, ip, (intmax_t)interface, port);
1046
fprintf(stderr, "Mandos plugin mandos-client: "
1047
"Mandos server \"%s\" found on %s (%s, %"
1048
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1049
ip, (intmax_t)interface, port);
1540
int ret = start_mandos_communication(ip, (in_port_t)port,
1542
avahi_proto_to_af(proto),
1051
int ret = start_mandos_communication(ip, port, interface,
1052
avahi_proto_to_af(proto));
1545
avahi_simple_poll_quit(simple_poll);
1054
avahi_simple_poll_quit(mc.simple_poll);
1547
if(not add_server(ip, (in_port_t)port, interface,
1548
avahi_proto_to_af(proto),
1549
&((mandos_context*)mc)->current_server)){
1550
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1056
ret = add_server(ip, port, interface,
1057
avahi_proto_to_af(proto));
1625
1126
signal_received = sig;
1626
1127
int old_errno = errno;
1627
1128
/* set main loop to exit */
1628
if(simple_poll != NULL){
1629
avahi_simple_poll_quit(simple_poll);
1129
if(mc.simple_poll != NULL){
1130
avahi_simple_poll_quit(mc.simple_poll);
1631
1132
errno = old_errno;
1634
__attribute__((nonnull, warn_unused_result))
1635
1135
bool get_flags(const char *ifname, struct ifreq *ifr){
1639
1138
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1642
1140
perror_plus("socket");
1646
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1647
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1143
strcpy(ifr->ifr_name, ifname);
1648
1144
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1652
1147
perror_plus("ioctl SIOCGIFFLAGS");
1660
__attribute__((nonnull, warn_unused_result))
1661
1154
bool good_flags(const char *ifname, const struct ifreq *ifr){
1663
1156
/* Reject the loopback device */
1664
1157
if(ifr->ifr_flags & IFF_LOOPBACK){
1666
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1671
1164
/* Accept point-to-point devices only if connect_to is specified */
1672
1165
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1674
fprintf_plus(stderr, "Accepting point-to-point interface"
1675
" \"%s\"\n", ifname);
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1679
1172
/* Otherwise, reject non-broadcast-capable devices */
1680
1173
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1682
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1683
" \"%s\"\n", ifname);
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1687
1180
/* Reject non-ARP interfaces (including dummy interfaces) */
1688
1181
if(ifr->ifr_flags & IFF_NOARP){
1690
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1696
1189
/* Accept this device */
1698
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1714
1207
struct ifreq ifr;
1715
1208
if(not get_flags(if_entry->d_name, &ifr)){
1717
fprintf_plus(stderr, "Failed to get flags for interface "
1718
"\"%s\"\n", if_entry->d_name);
1723
if(not good_flags(if_entry->d_name, &ifr)){
1730
* This function determines if a network interface is up.
1732
__attribute__((nonnull, warn_unused_result))
1733
bool interface_is_up(const char *interface){
1735
if(not get_flags(interface, &ifr)){
1737
fprintf_plus(stderr, "Failed to get flags for interface "
1738
"\"%s\"\n", interface);
1743
return (bool)(ifr.ifr_flags & IFF_UP);
1747
* This function determines if a network interface is running
1749
__attribute__((nonnull, warn_unused_result))
1750
bool interface_is_running(const char *interface){
1752
if(not get_flags(interface, &ifr)){
1754
fprintf_plus(stderr, "Failed to get flags for interface "
1755
"\"%s\"\n", interface);
1760
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1763
__attribute__((nonnull, pure, warn_unused_result))
1210
fprintf(stderr, "Mandos plugin mandos-client: "
1211
"Failed to get flags for interface \"%s\"\n",
1217
if(not good_flags(if_entry->d_name, &ifr)){
1224
* This function determines if a directory entry in /sys/class/net
1225
* corresponds to an acceptable network device which is up.
1226
* (This function is passed to scandir(3) as a filter function.)
1228
int up_interface(const struct dirent *if_entry){
1229
if(if_entry->d_name[0] == '.'){
1234
if(not get_flags(if_entry->d_name, &ifr)){
1236
fprintf(stderr, "Mandos plugin mandos-client: "
1237
"Failed to get flags for interface \"%s\"\n",
1243
/* Reject down interfaces */
1244
if(not (ifr.ifr_flags & IFF_UP)){
1246
fprintf(stderr, "Mandos plugin mandos-client: "
1247
"Rejecting down interface \"%s\"\n",
1253
/* Reject non-running interfaces */
1254
if(not (ifr.ifr_flags & IFF_RUNNING)){
1256
fprintf(stderr, "Mandos plugin mandos-client: "
1257
"Rejecting non-running interface \"%s\"\n",
1263
if(not good_flags(if_entry->d_name, &ifr)){
1764
1269
int notdotentries(const struct dirent *direntry){
1765
1270
/* Skip "." and ".." */
1766
1271
if(direntry->d_name[0] == '.'
1807
1319
if(not (S_ISREG(st.st_mode))){
1808
1320
/* Not a regular file */
1810
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1815
1328
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1816
1329
/* Not executable */
1818
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1824
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1830
__attribute__((nonnull, warn_unused_result))
1831
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1832
mandos_context *mc){
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1834
1342
struct timespec now;
1835
1343
struct timespec waited_time;
1836
1344
intmax_t block_time;
1839
if(mc->current_server == NULL){
1841
fprintf_plus(stderr, "Wait until first server is found."
1347
if(mc.current_server == NULL){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1844
1352
ret = avahi_simple_poll_iterate(s, -1);
1847
fprintf_plus(stderr, "Check current_server if we should run"
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1850
1359
/* the current time */
1851
1360
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1894
1403
ret = avahi_simple_poll_iterate(s, (int)block_time);
1897
if(ret > 0 or errno != EINTR){
1406
if (ret > 0 or errno != EINTR){
1898
1407
return (ret != 1) ? ret : 0;
1904
__attribute__((nonnull))
1905
void run_network_hooks(const char *mode, const char *interface,
1907
struct dirent **direntries = NULL;
1908
if(hookdir_fd == -1){
1909
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1911
if(hookdir_fd == -1){
1912
if(errno == ENOENT){
1914
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1915
" found\n", hookdir);
1918
perror_plus("open");
1923
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1924
runnable_hook, alphasort);
1926
perror_plus("scandir");
1929
struct dirent *direntry;
1931
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1933
perror_plus("open(\"/dev/null\", O_RDONLY)");
1936
for(int i = 0; i < numhooks; i++){
1937
direntry = direntries[i];
1939
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1942
pid_t hook_pid = fork();
1945
/* Raise privileges */
1946
errno = raise_privileges_permanently();
1948
perror_plus("Failed to raise privileges");
1955
perror_plus("setgid");
1958
/* Reset supplementary groups */
1960
ret = setgroups(0, NULL);
1962
perror_plus("setgroups");
1965
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1967
perror_plus("setenv");
1970
ret = setenv("DEVICE", interface, 1);
1972
perror_plus("setenv");
1975
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1977
perror_plus("setenv");
1980
ret = setenv("MODE", mode, 1);
1982
perror_plus("setenv");
1986
ret = asprintf(&delaystring, "%f", (double)delay);
1988
perror_plus("asprintf");
1991
ret = setenv("DELAY", delaystring, 1);
1994
perror_plus("setenv");
1998
if(connect_to != NULL){
1999
ret = setenv("CONNECT", connect_to, 1);
2001
perror_plus("setenv");
2005
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
perror_plus("openat");
2010
_exit(EXIT_FAILURE);
2012
if(close(hookdir_fd) == -1){
2013
perror_plus("close");
2014
_exit(EXIT_FAILURE);
2016
ret = dup2(devnull, STDIN_FILENO);
2018
perror_plus("dup2(devnull, STDIN_FILENO)");
2021
ret = close(devnull);
2023
perror_plus("close");
2026
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2028
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2031
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2033
perror_plus("fexecve");
2034
_exit(EXIT_FAILURE);
2038
perror_plus("fork");
2043
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2044
perror_plus("waitpid");
2048
if(WIFEXITED(status)){
2049
if(WEXITSTATUS(status) != 0){
2050
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2051
" with status %d\n", direntry->d_name,
2052
WEXITSTATUS(status));
2056
} else if(WIFSIGNALED(status)){
2057
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2058
" signal %d\n", direntry->d_name,
2063
fprintf_plus(stderr, "Warning: network hook \"%s\""
2064
" crashed\n", direntry->d_name);
2070
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2076
if(close(hookdir_fd) == -1){
2077
perror_plus("close");
2084
__attribute__((nonnull, warn_unused_result))
2085
int bring_up_interface(const char *const interface,
2087
int old_errno = errno;
2089
struct ifreq network;
2090
unsigned int if_index = if_nametoindex(interface);
2092
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2102
if(not interface_is_up(interface)){
2104
int ioctl_errno = 0;
2105
if(not get_flags(interface, &network)){
2107
fprintf_plus(stderr, "Failed to get flags for interface "
2108
"\"%s\"\n", interface);
2112
network.ifr_flags |= IFF_UP; /* set flag */
2114
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2117
perror_plus("socket");
2125
perror_plus("close");
2132
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2136
/* Raise privileges */
2137
ret_errno = raise_privileges();
2140
perror_plus("Failed to raise privileges");
2145
bool restore_loglevel = false;
2147
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2148
messages about the network interface to mess up the prompt */
2149
ret_linux = klogctl(8, NULL, 5);
2150
if(ret_linux == -1){
2151
perror_plus("klogctl");
2153
restore_loglevel = true;
2156
#endif /* __linux__ */
2157
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2158
ioctl_errno = errno;
2160
if(restore_loglevel){
2161
ret_linux = klogctl(7, NULL, 0);
2162
if(ret_linux == -1){
2163
perror_plus("klogctl");
2166
#endif /* __linux__ */
2168
/* If raise_privileges() succeeded above */
2170
/* Lower privileges */
2171
ret_errno = lower_privileges();
2174
perror_plus("Failed to lower privileges");
2178
/* Close the socket */
2181
perror_plus("close");
2184
if(ret_setflags == -1){
2185
errno = ioctl_errno;
2186
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2191
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2195
/* Sleep checking until interface is running.
2196
Check every 0.25s, up to total time of delay */
2197
for(int i=0; i < delay * 4; i++){
2198
if(interface_is_running(interface)){
2201
struct timespec sleeptime = { .tv_nsec = 250000000 };
2202
ret = nanosleep(&sleeptime, NULL);
2203
if(ret == -1 and errno != EINTR){
2204
perror_plus("nanosleep");
2212
__attribute__((nonnull, warn_unused_result))
2213
int take_down_interface(const char *const interface){
2214
int old_errno = errno;
2215
struct ifreq network;
2216
unsigned int if_index = if_nametoindex(interface);
2218
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2222
if(interface_is_up(interface)){
2224
int ioctl_errno = 0;
2225
if(not get_flags(interface, &network) and debug){
2227
fprintf_plus(stderr, "Failed to get flags for interface "
2228
"\"%s\"\n", interface);
2232
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2234
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2237
perror_plus("socket");
2243
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2247
/* Raise privileges */
2248
ret_errno = raise_privileges();
2251
perror_plus("Failed to raise privileges");
2254
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2255
ioctl_errno = errno;
2257
/* If raise_privileges() succeeded above */
2259
/* Lower privileges */
2260
ret_errno = lower_privileges();
2263
perror_plus("Failed to lower privileges");
2267
/* Close the socket */
2268
int ret = close(sd);
2270
perror_plus("close");
2273
if(ret_setflags == -1){
2274
errno = ioctl_errno;
2275
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2280
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2288
1413
int main(int argc, char *argv[]){
2289
mandos_context mc = { .server = NULL, .dh_bits = 0,
2290
.priority = "SECURE256:!CTYPE-X.509"
2291
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2292
.current_server = NULL, .interfaces = NULL,
2293
.interfaces_size = 0 };
2294
1414
AvahiSServiceBrowser *sb = NULL;
2297
1417
intmax_t tmpmax;
2299
1419
int exitcode = EXIT_SUCCESS;
2300
char *interfaces_to_take_down = NULL;
2301
size_t interfaces_to_take_down_size = 0;
2302
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2303
char old_tempdir[] = "/tmp/mandosXXXXXX";
2304
char *tempdir = NULL;
1420
const char *interface = "";
1421
struct ifreq network;
1423
bool take_down_interface = false;
1426
char tempdir[] = "/tmp/mandosXXXXXX";
1427
bool tempdir_created = false;
2305
1428
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2306
1429
const char *seckey = PATHDIR "/" SECKEY;
2307
1430
const char *pubkey = PATHDIR "/" PUBKEY;
2308
const char *dh_params_file = NULL;
2309
char *interfaces_hooks = NULL;
2311
1432
bool gnutls_initialized = false;
2312
1433
bool gpgme_initialized = false;
2498
1608
/* Work around Debian bug #633582:
2499
<https://bugs.debian.org/633582> */
2501
/* Re-raise privileges */
2502
ret = raise_privileges();
2505
perror_plus("Failed to raise privileges");
1609
<http://bugs.debian.org/633582> */
1612
/* Re-raise priviliges */
1616
perror_plus("seteuid");
1619
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1620
int seckey_fd = open(seckey, O_RDONLY);
1621
if(seckey_fd == -1){
1622
perror_plus("open");
1624
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1626
perror_plus("fstat");
1628
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1629
ret = fchown(seckey_fd, uid, gid);
1631
perror_plus("fchown");
1635
TEMP_FAILURE_RETRY(close(seckey_fd));
1639
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1640
int pubkey_fd = open(pubkey, O_RDONLY);
1641
if(pubkey_fd == -1){
1642
perror_plus("open");
1644
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1646
perror_plus("fstat");
1648
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1649
ret = fchown(pubkey_fd, uid, gid);
1651
perror_plus("fchown");
1655
TEMP_FAILURE_RETRY(close(pubkey_fd));
1659
/* Lower privileges */
1663
perror_plus("seteuid");
1667
/* Find network hooks and run them */
1669
struct dirent **direntries;
1670
struct dirent *direntry;
1671
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1674
perror_plus("scandir");
2509
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2510
int seckey_fd = open(seckey, O_RDONLY);
2511
if(seckey_fd == -1){
2512
perror_plus("open");
2514
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2516
perror_plus("fstat");
2518
if(S_ISREG(st.st_mode)
2519
and st.st_uid == 0 and st.st_gid == 0){
2520
ret = fchown(seckey_fd, uid, gid);
2522
perror_plus("fchown");
2530
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2531
int pubkey_fd = open(pubkey, O_RDONLY);
2532
if(pubkey_fd == -1){
2533
perror_plus("open");
2535
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2537
perror_plus("fstat");
2539
if(S_ISREG(st.st_mode)
2540
and st.st_uid == 0 and st.st_gid == 0){
2541
ret = fchown(pubkey_fd, uid, gid);
2543
perror_plus("fchown");
2551
if(dh_params_file != NULL
2552
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2553
int dhparams_fd = open(dh_params_file, O_RDONLY);
2554
if(dhparams_fd == -1){
2555
perror_plus("open");
2557
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2559
perror_plus("fstat");
2561
if(S_ISREG(st.st_mode)
2562
and st.st_uid == 0 and st.st_gid == 0){
2563
ret = fchown(dhparams_fd, uid, gid);
2565
perror_plus("fchown");
2573
/* Lower privileges */
2574
ret = lower_privileges();
2577
perror_plus("Failed to lower privileges");
2582
/* Remove invalid interface names (except "none") */
2584
char *interface = NULL;
2585
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2587
if(strcmp(interface, "none") != 0
2588
and if_nametoindex(interface) == 0){
2589
if(interface[0] != '\0'){
2590
fprintf_plus(stderr, "Not using nonexisting interface"
2591
" \"%s\"\n", interface);
2593
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2599
/* Run network hooks */
2601
if(mc.interfaces != NULL){
2602
interfaces_hooks = malloc(mc.interfaces_size);
2603
if(interfaces_hooks == NULL){
2604
perror_plus("malloc");
2607
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2608
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2610
run_network_hooks("start", interfaces_hooks != NULL ?
2611
interfaces_hooks : "", delay);
1676
int devnull = open("/dev/null", O_RDONLY);
1677
for(int i = 0; i < numhooks; i++){
1678
direntry = direntries[0];
1679
char *fullname = NULL;
1680
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1682
perror_plus("asprintf");
1685
pid_t hook_pid = fork();
1688
dup2(devnull, STDIN_FILENO);
1690
dup2(STDERR_FILENO, STDOUT_FILENO);
1691
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1693
perror_plus("setenv");
1696
ret = setenv("DEVICE", interface, 1);
1698
perror_plus("setenv");
1701
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1703
perror_plus("setenv");
1706
ret = setenv("MODE", "start", 1);
1708
perror_plus("setenv");
1712
ret = asprintf(&delaystring, "%f", delay);
1714
perror_plus("asprintf");
1717
ret = setenv("DELAY", delaystring, 1);
1720
perror_plus("setenv");
1724
ret = execl(fullname, direntry->d_name, "start", NULL);
1725
perror_plus("execl");
1728
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1729
perror_plus("waitpid");
1733
if(WIFEXITED(status)){
1734
if(WEXITSTATUS(status) != 0){
1735
fprintf(stderr, "Mandos plugin mandos-client: "
1736
"Warning: network hook \"%s\" exited"
1737
" with status %d\n", direntry->d_name,
1738
WEXITSTATUS(status));
1742
} else if(WIFSIGNALED(status)){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" died by"
1745
" signal %d\n", direntry->d_name,
1750
fprintf(stderr, "Mandos plugin mandos-client: "
1751
"Warning: network hook \"%s\" crashed\n",
2615
1767
avahi_set_log_function(empty_log);
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1776
/* No up interfaces, look for any good interfaces */
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1785
fprintf(stderr, "Mandos plugin mandos-client: "
1786
"Using interface \"%s\"\n", interface);
1788
if(interface == NULL){
1789
perror_plus("malloc");
1791
exitcode = EXIT_FAILURE;
1797
fprintf(stderr, "Mandos plugin mandos-client: "
1798
"Could not find a network interface\n");
1799
exitcode = EXIT_FAILURE;
2618
1804
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2619
1805
from the signal handler */
2620
1806
/* Initialize the pseudo-RNG for Avahi */
2621
1807
srand((unsigned int) time(NULL));
2622
simple_poll = avahi_simple_poll_new();
2623
if(simple_poll == NULL){
2624
fprintf_plus(stderr,
2625
"Avahi: Failed to create simple poll object.\n");
1808
mc.simple_poll = avahi_simple_poll_new();
1809
if(mc.simple_poll == NULL){
1810
fprintf(stderr, "Mandos plugin mandos-client: "
1811
"Avahi: Failed to create simple poll object.\n");
2626
1812
exitcode = EX_UNAVAILABLE;
2693
/* If no interfaces were specified, make a list */
2694
if(mc.interfaces == NULL){
2695
struct dirent **direntries = NULL;
2696
/* Look for any good interfaces */
2697
ret = scandir(sys_class_net, &direntries, good_interface,
2700
/* Add all found interfaces to interfaces list */
2701
for(int i = 0; i < ret; ++i){
2702
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2703
direntries[i]->d_name);
2706
perror_plus("argz_add");
2707
free(direntries[i]);
2711
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2712
direntries[i]->d_name);
2714
free(direntries[i]);
1879
/* If the interface is down, bring it up */
1880
if(strcmp(interface, "none") != 0){
1881
if_index = (AvahiIfIndex) if_nametoindex(interface);
1883
fprintf(stderr, "Mandos plugin mandos-client: "
1884
"No such interface: \"%s\"\n", interface);
1885
exitcode = EX_UNAVAILABLE;
1893
/* Re-raise priviliges */
1897
perror_plus("seteuid");
1901
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1902
messages about the network interface to mess up the prompt */
1903
ret = klogctl(8, NULL, 5);
1904
bool restore_loglevel = true;
1906
restore_loglevel = false;
1907
perror_plus("klogctl");
1909
#endif /* __linux__ */
1911
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1913
perror_plus("socket");
1914
exitcode = EX_OSERR;
1916
if(restore_loglevel){
1917
ret = klogctl(7, NULL, 0);
1919
perror_plus("klogctl");
1922
#endif /* __linux__ */
1923
/* Lower privileges */
1927
perror_plus("seteuid");
1931
strcpy(network.ifr_name, interface);
1932
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1934
perror_plus("ioctl SIOCGIFFLAGS");
1936
if(restore_loglevel){
1937
ret = klogctl(7, NULL, 0);
1939
perror_plus("klogctl");
1942
#endif /* __linux__ */
1943
exitcode = EX_OSERR;
1944
/* Lower privileges */
1948
perror_plus("seteuid");
1952
if((network.ifr_flags & IFF_UP) == 0){
1953
network.ifr_flags |= IFF_UP;
1954
take_down_interface = true;
1955
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1957
take_down_interface = false;
1958
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1959
exitcode = EX_OSERR;
1961
if(restore_loglevel){
1962
ret = klogctl(7, NULL, 0);
1964
perror_plus("klogctl");
1967
#endif /* __linux__ */
1968
/* Lower privileges */
1972
perror_plus("seteuid");
1977
/* Sleep checking until interface is running.
1978
Check every 0.25s, up to total time of delay */
1979
for(int i=0; i < delay * 4; i++){
1980
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1982
perror_plus("ioctl SIOCGIFFLAGS");
1983
} else if(network.ifr_flags & IFF_RUNNING){
1986
struct timespec sleeptime = { .tv_nsec = 250000000 };
1987
ret = nanosleep(&sleeptime, NULL);
1988
if(ret == -1 and errno != EINTR){
1989
perror_plus("nanosleep");
1992
if(not take_down_interface){
1993
/* We won't need the socket anymore */
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1996
perror_plus("close");
2000
if(restore_loglevel){
2001
/* Restores kernel loglevel to default */
2002
ret = klogctl(7, NULL, 0);
2004
perror_plus("klogctl");
2007
#endif /* __linux__ */
2008
/* Lower privileges */
2010
if(take_down_interface){
2011
/* Lower privileges */
2014
perror_plus("seteuid");
2721
fprintf_plus(stderr, "Could not find a network interface\n");
2722
exitcode = EXIT_FAILURE;
2727
/* Bring up interfaces which are down, and remove any "none"s */
2729
char *interface = NULL;
2730
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2732
/* If interface name is "none", stop bringing up interfaces.
2733
Also remove all instances of "none" from the list */
2734
if(strcmp(interface, "none") == 0){
2735
argz_delete(&mc.interfaces, &mc.interfaces_size,
2738
while((interface = argz_next(mc.interfaces,
2739
mc.interfaces_size, interface))){
2740
if(strcmp(interface, "none") == 0){
2741
argz_delete(&mc.interfaces, &mc.interfaces_size,
2748
bool interface_was_up = interface_is_up(interface);
2749
errno = bring_up_interface(interface, delay);
2750
if(not interface_was_up){
2752
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2753
" %s\n", interface, strerror(errno));
2755
errno = argz_add(&interfaces_to_take_down,
2756
&interfaces_to_take_down_size,
2759
perror_plus("argz_add");
2764
if(debug and (interfaces_to_take_down == NULL)){
2765
fprintf_plus(stderr, "No interfaces were brought up\n");
2769
/* If we only got one interface, explicitly use only that one */
2770
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2772
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2775
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2017
/* Lower privileges permanently */
2020
perror_plus("setuid");
2782
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2029
ret = init_gnutls_global(pubkey, seckey);
2784
fprintf_plus(stderr, "init_gnutls_global failed\n");
2031
fprintf(stderr, "Mandos plugin mandos-client: "
2032
"init_gnutls_global failed\n");
2785
2033
exitcode = EX_UNAVAILABLE;
2944
2187
/* Run the main loop */
2947
fprintf_plus(stderr, "Starting Avahi loop search\n");
2190
fprintf(stderr, "Mandos plugin mandos-client: "
2191
"Starting Avahi loop search\n");
2950
ret = avahi_loop_with_timeout(simple_poll,
2951
(int)(retry_interval * 1000), &mc);
2194
ret = avahi_loop_with_timeout(mc.simple_poll,
2195
(int)(retry_interval * 1000));
2953
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2954
(ret == 0) ? "successfully" : "with error");
2197
fprintf(stderr, "Mandos plugin mandos-client: "
2198
"avahi_loop_with_timeout exited %s\n",
2199
(ret == 0) ? "successfully" : "with error");
2960
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"%s exiting\n", argv[0]);
2963
2209
/* Cleanup things */
2964
free(mc.interfaces);
2967
2211
avahi_s_service_browser_free(sb);
2969
2213
if(mc.server != NULL)
2970
2214
avahi_server_free(mc.server);
2972
if(simple_poll != NULL)
2973
avahi_simple_poll_free(simple_poll);
2216
if(mc.simple_poll != NULL)
2217
avahi_simple_poll_free(mc.simple_poll);
2975
2219
if(gnutls_initialized){
2976
2220
gnutls_certificate_free_credentials(mc.cred);
2221
gnutls_global_deinit();
2977
2222
gnutls_dh_params_deinit(mc.dh_params);
2980
2225
if(gpgme_initialized){
2981
2226
gpgme_release(mc.ctx);
2984
2229
/* Cleans up the circular linked list of Mandos servers the client
2986
2231
if(mc.current_server != NULL){
2987
2232
mc.current_server->prev->next = NULL;
2988
2233
while(mc.current_server != NULL){
2989
2234
server *next = mc.current_server->next;
2991
#pragma GCC diagnostic push
2992
#pragma GCC diagnostic ignored "-Wcast-qual"
2994
free((char *)(mc.current_server->ip));
2996
#pragma GCC diagnostic pop
2998
2235
free(mc.current_server);
2999
2236
mc.current_server = next;
3003
/* Re-raise privileges */
3005
ret = raise_privileges();
3008
perror_plus("Failed to raise privileges");
3011
/* Run network hooks */
3012
run_network_hooks("stop", interfaces_hooks != NULL ?
3013
interfaces_hooks : "", delay);
3015
/* Take down the network interfaces which were brought up */
3017
char *interface = NULL;
3018
while((interface=argz_next(interfaces_to_take_down,
3019
interfaces_to_take_down_size,
3021
ret = take_down_interface(interface);
3024
perror_plus("Failed to take down interface");
3027
if(debug and (interfaces_to_take_down == NULL)){
3028
fprintf_plus(stderr, "No interfaces needed to be taken"
2240
/* XXX run network hooks "stop" here */
2242
/* Take down the network interface */
2243
if(take_down_interface){
2244
/* Re-raise priviliges */
2248
perror_plus("seteuid");
3034
ret = lower_privileges_permanently();
3037
perror_plus("Failed to lower privileges permanently");
2251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2253
perror_plus("ioctl SIOCGIFFLAGS");
2254
} else if(network.ifr_flags & IFF_UP){
2255
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2256
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2258
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2261
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2263
perror_plus("close");
2265
/* Lower privileges permanently */
2269
perror_plus("setuid");
3041
free(interfaces_to_take_down);
3042
free(interfaces_hooks);
3044
void clean_dir_at(int base, const char * const dirname,
2274
/* Removes the GPGME temp directory and all files inside */
2275
if(tempdir_created){
3046
2276
struct dirent **direntries = NULL;
3048
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3054
perror_plus("open");
3056
int numentries = scandirat(dir_fd, ".", &direntries,
3057
notdotentries, alphasort);
3058
if(numentries >= 0){
2277
struct dirent *direntry = NULL;
2278
int numentries = scandir(tempdir, &direntries, notdotentries,
2280
if (numentries > 0){
3059
2281
for(int i = 0; i < numentries; i++){
3061
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3062
dirname, direntries[i]->d_name);
3064
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3066
if(errno == EISDIR){
3067
dret = unlinkat(dir_fd, direntries[i]->d_name,
3070
if((dret == -1) and (errno == ENOTEMPTY)
3071
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3072
== 0) and (level == 0)){
3073
/* Recurse only in this special case */
3074
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3078
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3079
direntries[i]->d_name, strerror(errno));
3082
free(direntries[i]);
3085
/* need to clean even if 0 because man page doesn't specify */
3087
if(numentries == -1){
3088
perror_plus("scandirat");
3090
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3091
if(dret == -1 and errno != ENOENT){
3092
perror_plus("rmdir");
3095
perror_plus("scandirat");
3100
/* Removes the GPGME temp directory and all files inside */
3101
if(tempdir != NULL){
3102
clean_dir_at(-1, tempdir, 0);
2282
direntry = direntries[i];
2283
char *fullname = NULL;
2284
ret = asprintf(&fullname, "%s/%s", tempdir,
2287
perror_plus("asprintf");
2290
ret = remove(fullname);
2292
fprintf(stderr, "Mandos plugin mandos-client: "
2293
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2299
/* need to clean even if 0 because man page doesn't specify */
2301
if (numentries == -1){
2302
perror_plus("scandir");
2304
ret = rmdir(tempdir);
2305
if(ret == -1 and errno != ENOENT){
2306
perror_plus("rmdir");