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() */
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42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
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#include <stddef.h> /* NULL, size_t, ssize_t */
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46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
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47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy(), strsignal()
51
52
#include <sys/ioctl.h> /* ioctl */
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53
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
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sockaddr_in6, PF_INET6,
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#include <sys/stat.h> /* open(), S_ISREG */
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#include <sys/socket.h> /* socket(), struct sockaddr_in6,
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inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
59
inet_pton(), connect(),
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
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62
#include <dirent.h> /* opendir(), struct dirent, readdir()
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64
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
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EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
66
71
program_invocation_short_name */
67
72
#include <time.h> /* nanosleep(), time(), sleep() */
68
73
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
155
171
const char *priority;
157
173
server *current_server;
175
size_t interfaces_size;
158
176
} mandos_context;
160
/* global context so signal handler can reach it*/
161
mandos_context mc = { .simple_poll = NULL, .server = NULL,
162
.dh_bits = 1024, .priority = "SECURE256"
163
":!CTYPE-X.509:+CTYPE-OPENPGP",
164
.current_server = NULL };
178
/* global so signal handler can reach it*/
179
AvahiSimplePoll *simple_poll;
166
181
sig_atomic_t quit_now = 0;
167
182
int signal_received = 0;
169
184
/* Function to use when printing errors */
170
185
void perror_plus(const char *print_text){
171
187
fprintf(stderr, "Mandos plugin %s: ",
172
188
program_invocation_short_name);
173
190
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));
177
204
* Make additional room in "buffer" for at least BUFFER_SIZE more
178
205
* bytes. "buffer_capacity" is how much is currently allocated,
179
206
* "buffer_length" is how much is already used.
208
__attribute__((nonnull, warn_unused_result))
181
209
size_t incbuffer(char **buffer, size_t buffer_length,
182
size_t buffer_capacity){
210
size_t buffer_capacity){
183
211
if(buffer_length + BUFFER_SIZE > buffer_capacity){
184
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
212
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
int old_errno = errno;
188
221
buffer_capacity += BUFFER_SIZE;
190
223
return buffer_capacity;
193
226
/* Add server to set of servers to retry periodically */
194
int add_server(const char *ip, uint16_t port,
195
AvahiIfIndex if_index,
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){
198
231
server *new_server = malloc(sizeof(server));
199
232
if(new_server == NULL){
200
233
perror_plus("malloc");
203
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*new_server = (server){ .ip = strdup(ip),
205
.if_index = if_index,
238
.if_index = if_index,
207
240
if(new_server->ip == NULL){
208
241
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
211
259
/* Special case of first server */
212
if (mc.current_server == NULL){
260
if(*current_server == NULL){
213
261
new_server->next = new_server;
214
262
new_server->prev = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
263
*current_server = new_server;
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
265
/* Place the new server last in the list */
266
new_server->next = *current_server;
267
new_server->prev = (*current_server)->prev;
220
268
new_server->prev->next = new_server;
221
mc.current_server->prev = new_server;
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
225
perror_plus("clock_gettime");
269
(*current_server)->prev = new_server;
232
275
* Initialize GPGME.
234
static bool init_gpgme(const char *seckey,
235
const char *pubkey, const char *tempdir){
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,
236
282
gpgme_error_t rc;
237
283
gpgme_engine_info_t engine_info;
241
286
* Helper function to insert pub and seckey to the engine keyring.
243
bool import_key(const char *filename){
288
bool import_key(const char * const filename){
246
291
gpgme_data_t pgp_data;
342
384
ssize_t plaintext_length = 0;
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
387
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
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390
/* Create new GPGME data buffer from memory cryptotext */
350
391
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
352
393
if(rc != GPG_ERR_NO_ERROR){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
355
gpgme_strsource(rc), gpgme_strerror(rc));
394
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
395
gpgme_strsource(rc), gpgme_strerror(rc));
359
399
/* Create new empty GPGME data buffer for the plaintext */
360
400
rc = gpgme_data_new(&dh_plain);
361
401
if(rc != GPG_ERR_NO_ERROR){
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
402
fprintf_plus(stderr, "Mandos plugin mandos-client: "
403
"bad gpgme_data_new: %s: %s\n",
404
gpgme_strsource(rc), gpgme_strerror(rc));
365
405
gpgme_data_release(dh_crypto);
369
409
/* Decrypt data from the cryptotext data buffer to the plaintext
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
411
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
372
412
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
413
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
414
gpgme_strsource(rc), gpgme_strerror(rc));
376
415
plaintext_length = -1;
378
417
gpgme_decrypt_result_t result;
379
result = gpgme_op_decrypt_result(mc.ctx);
418
result = gpgme_op_decrypt_result(mc->ctx);
380
419
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
420
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
389
result->wrong_key_usage);
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);
390
426
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
427
fprintf_plus(stderr, "File name: %s\n", result->file_name);
394
429
gpgme_recipient_t recipient;
395
430
recipient = result->recipients;
396
431
while(recipient != NULL){
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
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
406
439
recipient = recipient->next;
467
498
return plaintext_length;
470
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value); /* Spurious warning from
472
-Wunreachable-code */
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);
478
514
/* GnuTLS log function callback */
515
__attribute__((nonnull))
479
516
static void debuggnutls(__attribute__((unused)) int level,
480
517
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
518
fprintf_plus(stderr, "GnuTLS: %s", string);
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
484
522
static int init_gnutls_global(const char *pubkeyfilename,
485
const char *seckeyfilename){
523
const char *seckeyfilename,
524
const char *dhparamsfilename,
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
493
ret = gnutls_global_init();
494
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
530
fprintf_plus(stderr, "Initializing GnuTLS\n");
508
541
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
542
ret = gnutls_certificate_allocate_credentials(&mc->cred);
510
543
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
513
gnutls_global_deinit();
544
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
safer_gnutls_strerror(ret));
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
550
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
551
" secret key %s as GnuTLS credentials\n",
524
556
ret = gnutls_certificate_set_openpgp_key_file
525
(mc.cred, pubkeyfilename, seckeyfilename,
557
(mc->cred, pubkeyfilename, seckeyfilename,
526
558
GNUTLS_OPENPGP_FMT_BASE64);
527
559
if(ret != GNUTLS_E_SUCCESS){
529
"Mandos plugin mandos-client: "
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
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));
537
568
/* GnuTLS server initialization */
538
ret = gnutls_dh_params_init(&mc.dh_params);
539
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
542
" %s\n", safer_gnutls_strerror(ret));
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
546
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
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;
631
if(dhparamsfilename == NULL){
632
if(mc->dh_bits == 0){
633
/* Find out the optimal number of DH bits */
634
/* Try to read the private key file */
635
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
637
int secfile = open(seckeyfilename, O_RDONLY);
642
size_t buffer_capacity = 0;
644
buffer_capacity = incbuffer((char **)&buffer.data,
646
(size_t)buffer_capacity);
647
if(buffer_capacity == 0){
648
perror_plus("incbuffer");
653
ssize_t bytes_read = read(secfile,
654
buffer.data + buffer.size,
660
/* check bytes_read for failure */
667
buffer.size += (unsigned int)bytes_read;
671
/* If successful, use buffer to parse private key */
672
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
673
if(buffer.data != NULL){
675
gnutls_openpgp_privkey_t privkey = NULL;
676
ret = gnutls_openpgp_privkey_init(&privkey);
677
if(ret != GNUTLS_E_SUCCESS){
678
fprintf_plus(stderr, "Error initializing OpenPGP key"
680
safer_gnutls_strerror(ret));
684
ret = gnutls_openpgp_privkey_import
685
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
686
if(ret != GNUTLS_E_SUCCESS){
687
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
688
safer_gnutls_strerror(ret));
694
/* Use private key to suggest an appropriate
696
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
697
gnutls_openpgp_privkey_deinit(privkey);
699
fprintf_plus(stderr, "This OpenPGP key implies using"
700
" a GnuTLS security parameter \"%s\".\n",
701
safe_string(gnutls_sec_param_get_name
707
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
708
/* Err on the side of caution */
709
sec_param = GNUTLS_SEC_PARAM_ULTRA;
711
fprintf_plus(stderr, "Falling back to security parameter"
713
safe_string(gnutls_sec_param_get_name
718
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
723
" implies %u DH bits; using that.\n",
724
safe_string(gnutls_sec_param_get_name
729
fprintf_plus(stderr, "Failed to get implied number of DH"
730
" bits for security parameter \"%s\"): %s\n",
731
safe_string(gnutls_sec_param_get_name
733
safer_gnutls_strerror(ret));
737
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
740
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
741
if(ret != GNUTLS_E_SUCCESS){
742
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
743
" bits): %s\n", mc->dh_bits,
744
safer_gnutls_strerror(ret));
748
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
559
gnutls_certificate_free_credentials(mc.cred);
560
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
754
gnutls_certificate_free_credentials(mc->cred);
755
gnutls_dh_params_deinit(mc->dh_params);
565
static int init_gnutls_session(gnutls_session_t *session){
759
__attribute__((nonnull, warn_unused_result))
760
static int init_gnutls_session(gnutls_session_t *session,
567
763
/* GnuTLS session creation */
624
816
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
625
817
__attribute__((unused)) const char *txt){}
819
/* Set effective uid to 0, return errno */
820
__attribute__((warn_unused_result))
821
int raise_privileges(void){
822
int old_errno = errno;
824
if(seteuid(0) == -1){
831
/* Set effective and real user ID to 0. Return errno. */
832
__attribute__((warn_unused_result))
833
int raise_privileges_permanently(void){
834
int old_errno = errno;
835
int ret = raise_privileges();
847
/* Set effective user ID to unprivileged saved user ID */
848
__attribute__((warn_unused_result))
849
int lower_privileges(void){
850
int old_errno = errno;
852
if(seteuid(uid) == -1){
859
/* Lower privileges permanently */
860
__attribute__((warn_unused_result))
861
int lower_privileges_permanently(void){
862
int old_errno = errno;
864
if(setuid(uid) == -1){
871
/* Helper function to add_local_route() and delete_local_route() */
872
__attribute__((nonnull, warn_unused_result))
873
static bool add_delete_local_route(const bool add,
875
AvahiIfIndex if_index){
877
char helper[] = "mandos-client-iprouteadddel";
878
char add_arg[] = "add";
879
char delete_arg[] = "delete";
880
char debug_flag[] = "--debug";
881
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
882
if(pluginhelperdir == NULL){
884
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
885
" variable not set; cannot run helper\n");
890
char interface[IF_NAMESIZE];
891
if(if_indextoname((unsigned int)if_index, interface) == NULL){
892
perror_plus("if_indextoname");
896
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
898
perror_plus("open(\"/dev/null\", O_RDONLY)");
904
/* Raise privileges */
905
errno = raise_privileges_permanently();
907
perror_plus("Failed to raise privileges");
908
/* _exit(EX_NOPERM); */
914
perror_plus("setgid");
917
/* Reset supplementary groups */
919
ret = setgroups(0, NULL);
921
perror_plus("setgroups");
925
ret = dup2(devnull, STDIN_FILENO);
927
perror_plus("dup2(devnull, STDIN_FILENO)");
930
ret = close(devnull);
932
perror_plus("close");
935
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
937
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
940
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
945
if(helperdir_fd == -1){
947
_exit(EX_UNAVAILABLE);
949
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
952
perror_plus("openat");
954
_exit(EX_UNAVAILABLE);
958
#pragma GCC diagnostic push
959
#pragma GCC diagnostic ignored "-Wcast-qual"
961
if(fexecve(helper_fd, (char *const [])
962
{ helper, add ? add_arg : delete_arg, (char *)address,
963
interface, debug ? debug_flag : NULL, NULL },
966
#pragma GCC diagnostic pop
968
perror_plus("fexecve");
980
pret = waitpid(pid, &status, 0);
981
if(pret == -1 and errno == EINTR and quit_now){
982
int errno_raising = 0;
983
if((errno = raise_privileges()) != 0){
984
errno_raising = errno;
985
perror_plus("Failed to raise privileges in order to"
986
" kill helper program");
988
if(kill(pid, SIGTERM) == -1){
991
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
992
perror_plus("Failed to lower privileges after killing"
997
} while(pret == -1 and errno == EINTR);
999
perror_plus("waitpid");
1002
if(WIFEXITED(status)){
1003
if(WEXITSTATUS(status) != 0){
1004
fprintf_plus(stderr, "Error: iprouteadddel exited"
1005
" with status %d\n", WEXITSTATUS(status));
1010
if(WIFSIGNALED(status)){
1011
fprintf_plus(stderr, "Error: iprouteadddel died by"
1012
" signal %d\n", WTERMSIG(status));
1015
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1019
__attribute__((nonnull, warn_unused_result))
1020
static bool add_local_route(const char *address,
1021
AvahiIfIndex if_index){
1023
fprintf_plus(stderr, "Adding route to %s\n", address);
1025
return add_delete_local_route(true, address, if_index);
1028
__attribute__((nonnull, warn_unused_result))
1029
static bool delete_local_route(const char *address,
1030
AvahiIfIndex if_index){
1032
fprintf_plus(stderr, "Removing route to %s\n", address);
1034
return add_delete_local_route(false, address, if_index);
627
1037
/* Called when a Mandos server is found */
628
static int start_mandos_communication(const char *ip, uint16_t port,
1038
__attribute__((nonnull, warn_unused_result))
1039
static int start_mandos_communication(const char *ip, in_port_t port,
629
1040
AvahiIfIndex if_index,
1041
int af, mandos_context *mc){
631
1042
int ret, tcp_sd = -1;
634
struct sockaddr_in in;
635
struct sockaddr_in6 in6;
1044
struct sockaddr_storage to;
637
1045
char *buffer = NULL;
638
1046
char *decrypted_buffer = NULL;
639
1047
size_t buffer_length = 0;
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
1070
fprintf_plus(stderr, "Bad address family: %d\n", af);
667
ret = init_gnutls_session(&session);
1075
/* If the interface is specified and we have a list of interfaces */
1076
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1077
/* Check if the interface is one of the interfaces we are using */
1080
char *interface = NULL;
1081
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1083
if(if_nametoindex(interface) == (unsigned int)if_index){
1090
/* This interface does not match any in the list, so we don't
1091
connect to the server */
1093
char interface[IF_NAMESIZE];
1094
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1095
perror_plus("if_indextoname");
1097
fprintf_plus(stderr, "Skipping server on non-used interface"
1099
if_indextoname((unsigned int)if_index,
1107
ret = init_gnutls_session(&session, mc);
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
1113
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1114
PRIuMAX "\n", ip, (uintmax_t)port);
678
tcp_sd = socket(pf, SOCK_STREAM, 0);
1117
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
681
1120
perror_plus("socket");
744
1176
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
1177
perror_plus("if_indextoname");
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
1179
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1180
"\n", ip, interface, (uintmax_t)port);
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
1183
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1184
ip, (uintmax_t)port);
755
1186
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
1187
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
759
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
762
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
766
perror_plus("inet_ntop");
768
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
781
ret = connect(tcp_sd, &to.in6, sizeof(to));
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
788
perror_plus("connect");
1189
ret = getnameinfo((struct sockaddr *)&to,
1190
sizeof(struct sockaddr_in6),
1191
addrstr, sizeof(addrstr), NULL, 0,
1194
ret = getnameinfo((struct sockaddr *)&to,
1195
sizeof(struct sockaddr_in),
1196
addrstr, sizeof(addrstr), NULL, 0,
1199
if(ret == EAI_SYSTEM){
1200
perror_plus("getnameinfo");
1201
} else if(ret != 0) {
1202
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1203
} else if(strcmp(addrstr, ip) != 0){
1204
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1215
ret = connect(tcp_sd, (struct sockaddr *)&to,
1216
sizeof(struct sockaddr_in6));
1218
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1219
sizeof(struct sockaddr_in));
1222
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1223
and if_index != AVAHI_IF_UNSPEC
1224
and connect_to == NULL
1225
and not route_added and
1226
((af == AF_INET6 and not
1227
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1229
or (af == AF_INET and
1230
/* Not a a IPv4LL address */
1231
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1232
& 0xFFFF0000L) != 0xA9FE0000L))){
1233
/* Work around Avahi bug - Avahi does not announce link-local
1234
addresses if it has a global address, so local hosts with
1235
*only* a link-local address (e.g. Mandos clients) cannot
1236
connect to a Mandos server announced by Avahi on a server
1237
host with a global address. Work around this by retrying
1238
with an explicit route added with the server's address.
1240
Avahi bug reference:
1241
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1242
https://bugs.debian.org/587961
1245
fprintf_plus(stderr, "Mandos server unreachable, trying"
1249
route_added = add_local_route(ip, if_index);
1255
if(errno != ECONNREFUSED or debug){
1257
perror_plus("connect");
799
1270
const char *out = mandos_protocol_version;
1044
1534
char ip[AVAHI_ADDRESS_STR_MAX];
1045
1535
avahi_address_snprint(ip, sizeof(ip), address);
1047
fprintf(stderr, "Mandos plugin mandos-client: "
1048
"Mandos server \"%s\" found on %s (%s, %"
1049
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1050
ip, (intmax_t)interface, port);
1537
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1538
PRIdMAX ") on port %" PRIu16 "\n", name,
1539
host_name, ip, (intmax_t)interface, port);
1052
int ret = start_mandos_communication(ip, port, interface,
1053
avahi_proto_to_af(proto));
1541
int ret = start_mandos_communication(ip, (in_port_t)port,
1543
avahi_proto_to_af(proto),
1055
avahi_simple_poll_quit(mc.simple_poll);
1546
avahi_simple_poll_quit(simple_poll);
1057
ret = add_server(ip, port, interface,
1058
avahi_proto_to_af(proto));
1548
if(not add_server(ip, (in_port_t)port, interface,
1549
avahi_proto_to_af(proto),
1550
&((mandos_context*)mc)->current_server)){
1551
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1127
1626
signal_received = sig;
1128
1627
int old_errno = errno;
1129
1628
/* set main loop to exit */
1130
if(mc.simple_poll != NULL){
1131
avahi_simple_poll_quit(mc.simple_poll);
1629
if(simple_poll != NULL){
1630
avahi_simple_poll_quit(simple_poll);
1133
1632
errno = old_errno;
1635
__attribute__((nonnull, warn_unused_result))
1136
1636
bool get_flags(const char *ifname, struct ifreq *ifr){
1139
1640
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1141
1643
perror_plus("socket");
1144
strcpy(ifr->ifr_name, ifname);
1647
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1648
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1145
1649
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1148
1653
perror_plus("ioctl SIOCGIFFLAGS");
1661
__attribute__((nonnull, warn_unused_result))
1155
1662
bool good_flags(const char *ifname, const struct ifreq *ifr){
1157
1664
/* Reject the loopback device */
1158
1665
if(ifr->ifr_flags & IFF_LOOPBACK){
1160
fprintf(stderr, "Mandos plugin mandos-client: "
1161
"Rejecting loopback interface \"%s\"\n", ifname);
1667
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1165
1672
/* Accept point-to-point devices only if connect_to is specified */
1166
1673
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1168
fprintf(stderr, "Mandos plugin mandos-client: "
1169
"Accepting point-to-point interface \"%s\"\n", ifname);
1675
fprintf_plus(stderr, "Accepting point-to-point interface"
1676
" \"%s\"\n", ifname);
1173
1680
/* Otherwise, reject non-broadcast-capable devices */
1174
1681
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1176
fprintf(stderr, "Mandos plugin mandos-client: "
1177
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1683
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1684
" \"%s\"\n", ifname);
1181
1688
/* Reject non-ARP interfaces (including dummy interfaces) */
1182
1689
if(ifr->ifr_flags & IFF_NOARP){
1184
fprintf(stderr, "Mandos plugin mandos-client: "
1185
"Rejecting non-ARP interface \"%s\"\n", ifname);
1691
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1190
1697
/* Accept this device */
1192
fprintf(stderr, "Mandos plugin mandos-client: "
1193
"Interface \"%s\" is good\n", ifname);
1699
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1208
1715
struct ifreq ifr;
1209
1716
if(not get_flags(if_entry->d_name, &ifr)){
1211
fprintf(stderr, "Mandos plugin mandos-client: "
1212
"Failed to get flags for interface \"%s\"\n",
1218
if(not good_flags(if_entry->d_name, &ifr)){
1225
* This function determines if a directory entry in /sys/class/net
1226
* corresponds to an acceptable network device which is up.
1227
* (This function is passed to scandir(3) as a filter function.)
1229
int up_interface(const struct dirent *if_entry){
1230
if(if_entry->d_name[0] == '.'){
1235
if(not get_flags(if_entry->d_name, &ifr)){
1237
fprintf(stderr, "Mandos plugin mandos-client: "
1238
"Failed to get flags for interface \"%s\"\n",
1244
/* Reject down interfaces */
1245
if(not (ifr.ifr_flags & IFF_UP)){
1247
fprintf(stderr, "Mandos plugin mandos-client: "
1248
"Rejecting down interface \"%s\"\n",
1254
/* Reject non-running interfaces */
1255
if(not (ifr.ifr_flags & IFF_RUNNING)){
1257
fprintf(stderr, "Mandos plugin mandos-client: "
1258
"Rejecting non-running interface \"%s\"\n",
1264
if(not good_flags(if_entry->d_name, &ifr)){
1718
fprintf_plus(stderr, "Failed to get flags for interface "
1719
"\"%s\"\n", if_entry->d_name);
1724
if(not good_flags(if_entry->d_name, &ifr)){
1731
* This function determines if a network interface is up.
1733
__attribute__((nonnull, warn_unused_result))
1734
bool interface_is_up(const char *interface){
1736
if(not get_flags(interface, &ifr)){
1738
fprintf_plus(stderr, "Failed to get flags for interface "
1739
"\"%s\"\n", interface);
1744
return (bool)(ifr.ifr_flags & IFF_UP);
1748
* This function determines if a network interface is running
1750
__attribute__((nonnull, warn_unused_result))
1751
bool interface_is_running(const char *interface){
1753
if(not get_flags(interface, &ifr)){
1755
fprintf_plus(stderr, "Failed to get flags for interface "
1756
"\"%s\"\n", interface);
1761
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1764
__attribute__((nonnull, pure, warn_unused_result))
1270
1765
int notdotentries(const struct dirent *direntry){
1271
1766
/* Skip "." and ".." */
1272
1767
if(direntry->d_name[0] == '.'
1291
/* Save pointer to last character */
1292
char *end = strchr(direntry->d_name, '\0')-1;
1299
if(((direntry->d_name)[0] == '#')
1301
/* Temporary #name# */
1305
/* XXX more rules here */
1307
ret = stat(direntry->d_name, &st);
1788
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1789
"abcdefghijklmnopqrstuvwxyz"
1792
if((direntry->d_name)[sret] != '\0'){
1793
/* Contains non-allowed characters */
1795
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1801
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1310
perror_plus("Could not stat plugin");
1804
perror_plus("Could not stat hook");
1314
1808
if(not (S_ISREG(st.st_mode))){
1315
1809
/* Not a regular file */
1811
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1318
1816
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1319
1817
/* Not executable */
1819
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1825
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1325
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1831
__attribute__((nonnull, warn_unused_result))
1832
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1833
mandos_context *mc){
1327
1835
struct timespec now;
1328
1836
struct timespec waited_time;
1329
1837
intmax_t block_time;
1332
if(mc.current_server == NULL){
1334
fprintf(stderr, "Mandos plugin mandos-client: "
1335
"Wait until first server is found. No timeout!\n");
1840
if(mc->current_server == NULL){
1842
fprintf_plus(stderr, "Wait until first server is found."
1337
1845
ret = avahi_simple_poll_iterate(s, -1);
1340
fprintf(stderr, "Mandos plugin mandos-client: "
1341
"Check current_server if we should run it,"
1848
fprintf_plus(stderr, "Check current_server if we should run"
1344
1851
/* the current time */
1345
1852
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1388
1895
ret = avahi_simple_poll_iterate(s, (int)block_time);
1391
if (ret > 0 or errno != EINTR){
1898
if(ret > 0 or errno != EINTR){
1392
1899
return (ret != 1) ? ret : 0;
1905
__attribute__((nonnull))
1906
void run_network_hooks(const char *mode, const char *interface,
1908
struct dirent **direntries = NULL;
1909
if(hookdir_fd == -1){
1910
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1912
if(hookdir_fd == -1){
1913
if(errno == ENOENT){
1915
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1916
" found\n", hookdir);
1919
perror_plus("open");
1924
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1925
runnable_hook, alphasort);
1927
perror_plus("scandir");
1930
struct dirent *direntry;
1932
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1934
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
for(int i = 0; i < numhooks; i++){
1938
direntry = direntries[i];
1940
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1943
pid_t hook_pid = fork();
1946
/* Raise privileges */
1947
errno = raise_privileges_permanently();
1949
perror_plus("Failed to raise privileges");
1956
perror_plus("setgid");
1959
/* Reset supplementary groups */
1961
ret = setgroups(0, NULL);
1963
perror_plus("setgroups");
1966
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1968
perror_plus("setenv");
1971
ret = setenv("DEVICE", interface, 1);
1973
perror_plus("setenv");
1976
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1978
perror_plus("setenv");
1981
ret = setenv("MODE", mode, 1);
1983
perror_plus("setenv");
1987
ret = asprintf(&delaystring, "%f", (double)delay);
1989
perror_plus("asprintf");
1992
ret = setenv("DELAY", delaystring, 1);
1995
perror_plus("setenv");
1999
if(connect_to != NULL){
2000
ret = setenv("CONNECT", connect_to, 1);
2002
perror_plus("setenv");
2006
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2010
perror_plus("openat");
2011
_exit(EXIT_FAILURE);
2013
if(close(hookdir_fd) == -1){
2014
perror_plus("close");
2015
_exit(EXIT_FAILURE);
2017
ret = dup2(devnull, STDIN_FILENO);
2019
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
ret = close(devnull);
2024
perror_plus("close");
2027
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2029
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2032
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2034
perror_plus("fexecve");
2035
_exit(EXIT_FAILURE);
2039
perror_plus("fork");
2044
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2045
perror_plus("waitpid");
2049
if(WIFEXITED(status)){
2050
if(WEXITSTATUS(status) != 0){
2051
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2052
" with status %d\n", direntry->d_name,
2053
WEXITSTATUS(status));
2057
} else if(WIFSIGNALED(status)){
2058
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2059
" signal %d\n", direntry->d_name,
2064
fprintf_plus(stderr, "Warning: network hook \"%s\""
2065
" crashed\n", direntry->d_name);
2071
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2077
if(close(hookdir_fd) == -1){
2078
perror_plus("close");
2085
__attribute__((nonnull, warn_unused_result))
2086
int bring_up_interface(const char *const interface,
2088
int old_errno = errno;
2090
struct ifreq network;
2091
unsigned int if_index = if_nametoindex(interface);
2093
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2103
if(not interface_is_up(interface)){
2105
int ioctl_errno = 0;
2106
if(not get_flags(interface, &network)){
2108
fprintf_plus(stderr, "Failed to get flags for interface "
2109
"\"%s\"\n", interface);
2113
network.ifr_flags |= IFF_UP; /* set flag */
2115
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2118
perror_plus("socket");
2126
perror_plus("close");
2133
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2137
/* Raise privileges */
2138
ret_errno = raise_privileges();
2141
perror_plus("Failed to raise privileges");
2146
bool restore_loglevel = false;
2148
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2149
messages about the network interface to mess up the prompt */
2150
ret_linux = klogctl(8, NULL, 5);
2151
if(ret_linux == -1){
2152
perror_plus("klogctl");
2154
restore_loglevel = true;
2157
#endif /* __linux__ */
2158
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2159
ioctl_errno = errno;
2161
if(restore_loglevel){
2162
ret_linux = klogctl(7, NULL, 0);
2163
if(ret_linux == -1){
2164
perror_plus("klogctl");
2167
#endif /* __linux__ */
2169
/* If raise_privileges() succeeded above */
2171
/* Lower privileges */
2172
ret_errno = lower_privileges();
2175
perror_plus("Failed to lower privileges");
2179
/* Close the socket */
2182
perror_plus("close");
2185
if(ret_setflags == -1){
2186
errno = ioctl_errno;
2187
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2192
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2196
/* Sleep checking until interface is running.
2197
Check every 0.25s, up to total time of delay */
2198
for(int i=0; i < delay * 4; i++){
2199
if(interface_is_running(interface)){
2202
struct timespec sleeptime = { .tv_nsec = 250000000 };
2203
ret = nanosleep(&sleeptime, NULL);
2204
if(ret == -1 and errno != EINTR){
2205
perror_plus("nanosleep");
2213
__attribute__((nonnull, warn_unused_result))
2214
int take_down_interface(const char *const interface){
2215
int old_errno = errno;
2216
struct ifreq network;
2217
unsigned int if_index = if_nametoindex(interface);
2219
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2223
if(interface_is_up(interface)){
2225
int ioctl_errno = 0;
2226
if(not get_flags(interface, &network) and debug){
2228
fprintf_plus(stderr, "Failed to get flags for interface "
2229
"\"%s\"\n", interface);
2233
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2235
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2238
perror_plus("socket");
2244
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2248
/* Raise privileges */
2249
ret_errno = raise_privileges();
2252
perror_plus("Failed to raise privileges");
2255
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2256
ioctl_errno = errno;
2258
/* If raise_privileges() succeeded above */
2260
/* Lower privileges */
2261
ret_errno = lower_privileges();
2264
perror_plus("Failed to lower privileges");
2268
/* Close the socket */
2269
int ret = close(sd);
2271
perror_plus("close");
2274
if(ret_setflags == -1){
2275
errno = ioctl_errno;
2276
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2281
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1398
2289
int main(int argc, char *argv[]){
2290
mandos_context mc = { .server = NULL, .dh_bits = 0,
2291
.priority = "SECURE256:!CTYPE-X.509"
2292
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2293
.current_server = NULL, .interfaces = NULL,
2294
.interfaces_size = 0 };
1399
2295
AvahiSServiceBrowser *sb = NULL;
1402
2298
intmax_t tmpmax;
1404
2300
int exitcode = EXIT_SUCCESS;
1405
const char *interface = "";
1406
struct ifreq network;
1408
bool take_down_interface = false;
1411
char tempdir[] = "/tmp/mandosXXXXXX";
1412
bool tempdir_created = false;
2301
char *interfaces_to_take_down = NULL;
2302
size_t interfaces_to_take_down_size = 0;
2303
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2304
char old_tempdir[] = "/tmp/mandosXXXXXX";
2305
char *tempdir = NULL;
1413
2306
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1414
2307
const char *seckey = PATHDIR "/" SECKEY;
1415
2308
const char *pubkey = PATHDIR "/" PUBKEY;
2309
const char *dh_params_file = NULL;
2310
char *interfaces_hooks = NULL;
1417
2312
bool gnutls_initialized = false;
1418
2313
bool gpgme_initialized = false;
1586
2499
/* Work around Debian bug #633582:
1587
<http://bugs.debian.org/633582> */
1590
/* Re-raise priviliges */
1594
perror_plus("seteuid");
1597
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1598
int seckey_fd = open(seckey, O_RDONLY);
1599
if(seckey_fd == -1){
1600
perror_plus("open");
1602
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1604
perror_plus("fstat");
1606
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1607
ret = fchown(seckey_fd, uid, gid);
1609
perror_plus("fchown");
1613
TEMP_FAILURE_RETRY(close(seckey_fd));
1617
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1618
int pubkey_fd = open(pubkey, O_RDONLY);
1619
if(pubkey_fd == -1){
1620
perror_plus("open");
1622
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1624
perror_plus("fstat");
1626
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1627
ret = fchown(pubkey_fd, uid, gid);
1629
perror_plus("fchown");
1633
TEMP_FAILURE_RETRY(close(pubkey_fd));
1637
/* Lower privileges */
1641
perror_plus("seteuid");
1645
/* Find network hooks and run them */
1647
struct dirent **direntries;
1648
struct dirent *direntry;
1649
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1652
perror_plus("scandir");
2500
<https://bugs.debian.org/633582> */
2502
/* Re-raise privileges */
2503
ret = raise_privileges();
2506
perror_plus("Failed to raise privileges");
1654
int devnull = open("/dev/null", O_RDONLY);
1655
for(int i = 0; i < numhooks; i++){
1656
direntry = direntries[0];
1657
char *fullname = NULL;
1658
ret = asprintf(&fullname, "%s/%s", tempdir,
1661
perror_plus("asprintf");
1664
pid_t hook_pid = fork();
1667
dup2(devnull, STDIN_FILENO);
1669
dup2(STDERR_FILENO, STDOUT_FILENO);
1670
ret = setenv("DEVICE", interface, 1);
1672
perror_plus("setenv");
1675
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1677
perror_plus("setenv");
1680
ret = setenv("MODE", "start", 1);
1682
perror_plus("setenv");
1686
ret = asprintf(&delaystring, "%f", delay);
1688
perror_plus("asprintf");
1691
ret = setenv("DELAY", delaystring, 1);
1694
perror_plus("setenv");
1698
ret = execl(fullname, direntry->d_name, "start", NULL);
1699
perror_plus("execl");
1702
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1703
perror_plus("waitpid");
1707
if(WIFEXITED(status)){
1708
if(WEXITSTATUS(status) != 0){
1709
fprintf(stderr, "Mandos plugin mandos-client: "
1710
"Warning: network hook \"%s\" exited"
1711
" with status %d\n", direntry->d_name,
1712
WEXITSTATUS(status));
1716
} else if(WIFSIGNALED(status)){
1717
fprintf(stderr, "Mandos plugin mandos-client: "
1718
"Warning: network hook \"%s\" died by"
1719
" signal %d\n", direntry->d_name,
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" crashed\n",
2510
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2511
int seckey_fd = open(seckey, O_RDONLY);
2512
if(seckey_fd == -1){
2513
perror_plus("open");
2515
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2517
perror_plus("fstat");
2519
if(S_ISREG(st.st_mode)
2520
and st.st_uid == 0 and st.st_gid == 0){
2521
ret = fchown(seckey_fd, uid, gid);
2523
perror_plus("fchown");
2531
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2532
int pubkey_fd = open(pubkey, O_RDONLY);
2533
if(pubkey_fd == -1){
2534
perror_plus("open");
2536
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2538
perror_plus("fstat");
2540
if(S_ISREG(st.st_mode)
2541
and st.st_uid == 0 and st.st_gid == 0){
2542
ret = fchown(pubkey_fd, uid, gid);
2544
perror_plus("fchown");
2552
if(dh_params_file != NULL
2553
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2554
int dhparams_fd = open(dh_params_file, O_RDONLY);
2555
if(dhparams_fd == -1){
2556
perror_plus("open");
2558
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2560
perror_plus("fstat");
2562
if(S_ISREG(st.st_mode)
2563
and st.st_uid == 0 and st.st_gid == 0){
2564
ret = fchown(dhparams_fd, uid, gid);
2566
perror_plus("fchown");
2574
/* Lower privileges */
2575
ret = lower_privileges();
2578
perror_plus("Failed to lower privileges");
2583
/* Remove invalid interface names (except "none") */
2585
char *interface = NULL;
2586
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2588
if(strcmp(interface, "none") != 0
2589
and if_nametoindex(interface) == 0){
2590
if(interface[0] != '\0'){
2591
fprintf_plus(stderr, "Not using nonexisting interface"
2592
" \"%s\"\n", interface);
2594
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2600
/* Run network hooks */
2602
if(mc.interfaces != NULL){
2603
interfaces_hooks = malloc(mc.interfaces_size);
2604
if(interfaces_hooks == NULL){
2605
perror_plus("malloc");
2608
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2609
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2611
run_network_hooks("start", interfaces_hooks != NULL ?
2612
interfaces_hooks : "", delay);
1741
2616
avahi_set_log_function(empty_log);
1744
if(interface[0] == '\0'){
1745
struct dirent **direntries;
1746
/* First look for interfaces that are up */
1747
ret = scandir(sys_class_net, &direntries, up_interface,
1750
/* No up interfaces, look for any good interfaces */
1752
ret = scandir(sys_class_net, &direntries, good_interface,
1756
/* Pick the first interface returned */
1757
interface = strdup(direntries[0]->d_name);
1759
fprintf(stderr, "Mandos plugin mandos-client: "
1760
"Using interface \"%s\"\n", interface);
1762
if(interface == NULL){
1763
perror_plus("malloc");
1765
exitcode = EXIT_FAILURE;
1771
fprintf(stderr, "Mandos plugin mandos-client: "
1772
"Could not find a network interface\n");
1773
exitcode = EXIT_FAILURE;
1778
2619
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1779
2620
from the signal handler */
1780
2621
/* Initialize the pseudo-RNG for Avahi */
1781
2622
srand((unsigned int) time(NULL));
1782
mc.simple_poll = avahi_simple_poll_new();
1783
if(mc.simple_poll == NULL){
1784
fprintf(stderr, "Mandos plugin mandos-client: "
1785
"Avahi: Failed to create simple poll object.\n");
2623
simple_poll = avahi_simple_poll_new();
2624
if(simple_poll == NULL){
2625
fprintf_plus(stderr,
2626
"Avahi: Failed to create simple poll object.\n");
1786
2627
exitcode = EX_UNAVAILABLE;
1853
/* If the interface is down, bring it up */
1854
if(strcmp(interface, "none") != 0){
1855
if_index = (AvahiIfIndex) if_nametoindex(interface);
1857
fprintf(stderr, "Mandos plugin mandos-client: "
1858
"No such interface: \"%s\"\n", interface);
1859
exitcode = EX_UNAVAILABLE;
1867
/* Re-raise priviliges */
1871
perror_plus("seteuid");
1875
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1876
messages about the network interface to mess up the prompt */
1877
ret = klogctl(8, NULL, 5);
1878
bool restore_loglevel = true;
1880
restore_loglevel = false;
1881
perror_plus("klogctl");
1883
#endif /* __linux__ */
1885
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1887
perror_plus("socket");
1888
exitcode = EX_OSERR;
1890
if(restore_loglevel){
1891
ret = klogctl(7, NULL, 0);
1893
perror_plus("klogctl");
1896
#endif /* __linux__ */
1897
/* Lower privileges */
1901
perror_plus("seteuid");
1905
strcpy(network.ifr_name, interface);
1906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1908
perror_plus("ioctl SIOCGIFFLAGS");
1910
if(restore_loglevel){
1911
ret = klogctl(7, NULL, 0);
1913
perror_plus("klogctl");
1916
#endif /* __linux__ */
1917
exitcode = EX_OSERR;
1918
/* Lower privileges */
1922
perror_plus("seteuid");
1926
if((network.ifr_flags & IFF_UP) == 0){
1927
network.ifr_flags |= IFF_UP;
1928
take_down_interface = true;
1929
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1931
take_down_interface = false;
1932
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1933
exitcode = EX_OSERR;
1935
if(restore_loglevel){
1936
ret = klogctl(7, NULL, 0);
1938
perror_plus("klogctl");
2694
/* If no interfaces were specified, make a list */
2695
if(mc.interfaces == NULL){
2696
struct dirent **direntries = NULL;
2697
/* Look for any good interfaces */
2698
ret = scandir(sys_class_net, &direntries, good_interface,
2701
/* Add all found interfaces to interfaces list */
2702
for(int i = 0; i < ret; ++i){
2703
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2704
direntries[i]->d_name);
2707
perror_plus("argz_add");
2708
free(direntries[i]);
2712
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2713
direntries[i]->d_name);
2715
free(direntries[i]);
2722
fprintf_plus(stderr, "Could not find a network interface\n");
2723
exitcode = EXIT_FAILURE;
2728
/* Bring up interfaces which are down, and remove any "none"s */
2730
char *interface = NULL;
2731
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2733
/* If interface name is "none", stop bringing up interfaces.
2734
Also remove all instances of "none" from the list */
2735
if(strcmp(interface, "none") == 0){
2736
argz_delete(&mc.interfaces, &mc.interfaces_size,
2739
while((interface = argz_next(mc.interfaces,
2740
mc.interfaces_size, interface))){
2741
if(strcmp(interface, "none") == 0){
2742
argz_delete(&mc.interfaces, &mc.interfaces_size,
1941
#endif /* __linux__ */
1942
/* Lower privileges */
1946
perror_plus("seteuid");
1951
/* Sleep checking until interface is running.
1952
Check every 0.25s, up to total time of delay */
1953
for(int i=0; i < delay * 4; i++){
1954
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1956
perror_plus("ioctl SIOCGIFFLAGS");
1957
} else if(network.ifr_flags & IFF_RUNNING){
1960
struct timespec sleeptime = { .tv_nsec = 250000000 };
1961
ret = nanosleep(&sleeptime, NULL);
1962
if(ret == -1 and errno != EINTR){
1963
perror_plus("nanosleep");
1966
if(not take_down_interface){
1967
/* We won't need the socket anymore */
1968
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1970
perror_plus("close");
1974
if(restore_loglevel){
1975
/* Restores kernel loglevel to default */
1976
ret = klogctl(7, NULL, 0);
1978
perror_plus("klogctl");
1981
#endif /* __linux__ */
1982
/* Lower privileges */
1984
if(take_down_interface){
1985
/* Lower privileges */
1988
perror_plus("seteuid");
1991
/* Lower privileges permanently */
1994
perror_plus("setuid");
2749
bool interface_was_up = interface_is_up(interface);
2750
errno = bring_up_interface(interface, delay);
2751
if(not interface_was_up){
2753
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2754
" %s\n", interface, strerror(errno));
2756
errno = argz_add(&interfaces_to_take_down,
2757
&interfaces_to_take_down_size,
2760
perror_plus("argz_add");
2765
if(debug and (interfaces_to_take_down == NULL)){
2766
fprintf_plus(stderr, "No interfaces were brought up\n");
2770
/* If we only got one interface, explicitly use only that one */
2771
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2773
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2776
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2003
ret = init_gnutls_global(pubkey, seckey);
2783
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2005
fprintf(stderr, "Mandos plugin mandos-client: "
2006
"init_gnutls_global failed\n");
2785
fprintf_plus(stderr, "init_gnutls_global failed\n");
2007
2786
exitcode = EX_UNAVAILABLE;
2161
2945
/* Run the main loop */
2164
fprintf(stderr, "Mandos plugin mandos-client: "
2165
"Starting Avahi loop search\n");
2948
fprintf_plus(stderr, "Starting Avahi loop search\n");
2168
ret = avahi_loop_with_timeout(mc.simple_poll,
2169
(int)(retry_interval * 1000));
2951
ret = avahi_loop_with_timeout(simple_poll,
2952
(int)(retry_interval * 1000), &mc);
2171
fprintf(stderr, "Mandos plugin mandos-client: "
2172
"avahi_loop_with_timeout exited %s\n",
2173
(ret == 0) ? "successfully" : "with error");
2954
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2955
(ret == 0) ? "successfully" : "with error");
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"%s exiting\n", argv[0]);
2961
if(signal_received){
2962
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2963
argv[0], signal_received,
2964
strsignal(signal_received));
2966
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2183
2970
/* Cleanup things */
2971
free(mc.interfaces);
2185
2974
avahi_s_service_browser_free(sb);
2187
2976
if(mc.server != NULL)
2188
2977
avahi_server_free(mc.server);
2190
if(mc.simple_poll != NULL)
2191
avahi_simple_poll_free(mc.simple_poll);
2979
if(simple_poll != NULL)
2980
avahi_simple_poll_free(simple_poll);
2193
2982
if(gnutls_initialized){
2194
2983
gnutls_certificate_free_credentials(mc.cred);
2195
gnutls_global_deinit();
2196
2984
gnutls_dh_params_deinit(mc.dh_params);
2199
2987
if(gpgme_initialized){
2200
2988
gpgme_release(mc.ctx);
2203
2991
/* Cleans up the circular linked list of Mandos servers the client
2205
2993
if(mc.current_server != NULL){
2206
2994
mc.current_server->prev->next = NULL;
2207
2995
while(mc.current_server != NULL){
2208
2996
server *next = mc.current_server->next;
2998
#pragma GCC diagnostic push
2999
#pragma GCC diagnostic ignored "-Wcast-qual"
3001
free((char *)(mc.current_server->ip));
3003
#pragma GCC diagnostic pop
2209
3005
free(mc.current_server);
2210
3006
mc.current_server = next;
2214
/* XXX run network hooks "stop" here */
2216
/* Take down the network interface */
2217
if(take_down_interface){
2218
/* Re-raise priviliges */
2222
perror_plus("seteuid");
2225
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2227
perror_plus("ioctl SIOCGIFFLAGS");
2228
} else if(network.ifr_flags & IFF_UP){
2229
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2230
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2232
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2235
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2237
perror_plus("close");
2239
/* Lower privileges permanently */
2243
perror_plus("setuid");
3010
/* Re-raise privileges */
3012
ret = raise_privileges();
3015
perror_plus("Failed to raise privileges");
3018
/* Run network hooks */
3019
run_network_hooks("stop", interfaces_hooks != NULL ?
3020
interfaces_hooks : "", delay);
3022
/* Take down the network interfaces which were brought up */
3024
char *interface = NULL;
3025
while((interface=argz_next(interfaces_to_take_down,
3026
interfaces_to_take_down_size,
3028
ret = take_down_interface(interface);
3031
perror_plus("Failed to take down interface");
3034
if(debug and (interfaces_to_take_down == NULL)){
3035
fprintf_plus(stderr, "No interfaces needed to be taken"
3041
ret = lower_privileges_permanently();
3044
perror_plus("Failed to lower privileges permanently");
3048
free(interfaces_to_take_down);
3049
free(interfaces_hooks);
3051
void clean_dir_at(int base, const char * const dirname,
3053
struct dirent **direntries = NULL;
3055
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3061
perror_plus("open");
3063
int numentries = scandirat(dir_fd, ".", &direntries,
3064
notdotentries, alphasort);
3065
if(numentries >= 0){
3066
for(int i = 0; i < numentries; i++){
3068
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3069
dirname, direntries[i]->d_name);
3071
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3073
if(errno == EISDIR){
3074
dret = unlinkat(dir_fd, direntries[i]->d_name,
3077
if((dret == -1) and (errno == ENOTEMPTY)
3078
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3079
== 0) and (level == 0)){
3080
/* Recurse only in this special case */
3081
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3085
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3086
direntries[i]->d_name, strerror(errno));
3089
free(direntries[i]);
3092
/* need to clean even if 0 because man page doesn't specify */
3094
if(numentries == -1){
3095
perror_plus("scandirat");
3097
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3098
if(dret == -1 and errno != ENOENT){
3099
perror_plus("rmdir");
3102
perror_plus("scandirat");
2248
3107
/* Removes the GPGME temp directory and all files inside */
2249
if(tempdir_created){
2250
struct dirent **direntries = NULL;
2251
struct dirent *direntry = NULL;
2252
int numentries = scandir(tempdir, &direntries, notdotentries,
2254
if (numentries > 0){
2255
for(int i = 0; i < numentries; i++){
2256
direntry = direntries[i];
2257
char *fullname = NULL;
2258
ret = asprintf(&fullname, "%s/%s", tempdir,
2261
perror_plus("asprintf");
2264
ret = remove(fullname);
2266
fprintf(stderr, "Mandos plugin mandos-client: "
2267
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2273
/* need to clean even if 0 because man page doesn't specify */
2275
if (numentries == -1){
2276
perror_plus("scandir");
2278
ret = rmdir(tempdir);
2279
if(ret == -1 and errno != ENOENT){
2280
perror_plus("rmdir");
3108
if(tempdir != NULL){
3109
clean_dir_at(-1, tempdir, 0);