26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno, program_invocation_short_name */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
66
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
151
166
const char *priority;
153
168
server *current_server;
170
size_t interfaces_size;
154
171
} mandos_context;
156
/* global context so signal handler can reach it*/
157
mandos_context mc = { .simple_poll = NULL, .server = NULL,
158
.dh_bits = 1024, .priority = "SECURE256"
159
":!CTYPE-X.509:+CTYPE-OPENPGP", .current_server = NULL };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
161
176
sig_atomic_t quit_now = 0;
162
177
int signal_received = 0;
164
179
/* Function to use when printing errors */
165
180
void perror_plus(const char *print_text){
166
fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
167
185
perror(print_text);
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
191
va_start (ap, format);
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
171
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
172
200
* bytes. "buffer_capacity" is how much is currently allocated,
173
201
* "buffer_length" is how much is already used.
203
__attribute__((nonnull, warn_unused_result))
175
204
size_t incbuffer(char **buffer, size_t buffer_length,
176
size_t buffer_capacity){
205
size_t buffer_capacity){
177
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
178
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
209
int old_errno = errno;
182
216
buffer_capacity += BUFFER_SIZE;
184
218
return buffer_capacity;
187
int add_server(const char *ip, uint16_t port,
188
AvahiIfIndex if_index,
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
191
226
server *new_server = malloc(sizeof(server));
192
227
if(new_server == NULL){
193
228
perror_plus("malloc");
196
231
*new_server = (server){ .ip = strdup(ip),
198
.if_index = if_index,
233
.if_index = if_index,
200
235
if(new_server->ip == NULL){
201
236
perror_plus("strdup");
204
/* uniqe case of first server */
205
if (mc.current_server == NULL){
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
242
perror_plus("clock_gettime");
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
247
free((char *)(new_server->ip));
249
#pragma GCC diagnostic pop
254
/* Special case of first server */
255
if(*current_server == NULL){
206
256
new_server->next = new_server;
207
257
new_server->prev = new_server;
208
mc.current_server = new_server;
209
/* Placing the new server last in the list */
258
*current_server = new_server;
211
new_server->next = mc.current_server;
212
new_server->prev = mc.current_server->prev;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
213
263
new_server->prev->next = new_server;
214
mc.current_server->prev = new_server;
216
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
218
perror_plus("clock_gettime");
264
(*current_server)->prev = new_server;
225
270
* Initialize GPGME.
227
static bool init_gpgme(const char *seckey,
228
const char *pubkey, const char *tempdir){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
229
277
gpgme_error_t rc;
230
278
gpgme_engine_info_t engine_info;
234
281
* Helper function to insert pub and seckey to the engine keyring.
236
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
239
286
gpgme_data_t pgp_data;
328
379
ssize_t plaintext_length = 0;
331
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
334
385
/* Create new GPGME data buffer from memory cryptotext */
335
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
337
388
if(rc != GPG_ERR_NO_ERROR){
338
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
339
gpgme_strsource(rc), gpgme_strerror(rc));
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
343
394
/* Create new empty GPGME data buffer for the plaintext */
344
395
rc = gpgme_data_new(&dh_plain);
345
396
if(rc != GPG_ERR_NO_ERROR){
346
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
347
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
348
400
gpgme_data_release(dh_crypto);
352
404
/* Decrypt data from the cryptotext data buffer to the plaintext
354
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
355
407
if(rc != GPG_ERR_NO_ERROR){
356
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
357
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
358
410
plaintext_length = -1;
360
412
gpgme_decrypt_result_t result;
361
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
362
414
if(result == NULL){
363
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
365
fprintf(stderr, "Unsupported algorithm: %s\n",
366
result->unsupported_algorithm);
367
fprintf(stderr, "Wrong key usage: %u\n",
368
result->wrong_key_usage);
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
369
421
if(result->file_name != NULL){
370
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
372
424
gpgme_recipient_t recipient;
373
425
recipient = result->recipients;
374
426
while(recipient != NULL){
375
fprintf(stderr, "Public key algorithm: %s\n",
376
gpgme_pubkey_algo_name(recipient->pubkey_algo));
377
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
378
fprintf(stderr, "Secret key available: %s\n",
379
recipient->status == GPG_ERR_NO_SECKEY
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
381
434
recipient = recipient->next;
480
536
/* OpenPGP credentials */
481
gnutls_certificate_allocate_credentials(&mc.cred);
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
482
538
if(ret != GNUTLS_E_SUCCESS){
483
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
487
safer_gnutls_strerror(ret));
488
gnutls_global_deinit();
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
545
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
546
" secret key %s as GnuTLS credentials\n",
498
551
ret = gnutls_certificate_set_openpgp_key_file
499
(mc.cred, pubkeyfilename, seckeyfilename,
552
(mc->cred, pubkeyfilename, seckeyfilename,
500
553
GNUTLS_OPENPGP_FMT_BASE64);
501
554
if(ret != GNUTLS_E_SUCCESS){
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
505
fprintf(stderr, "The GnuTLS error is: %s\n",
506
safer_gnutls_strerror(ret));
556
"Error[%d] while reading the OpenPGP key pair ('%s',"
557
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
558
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
559
safer_gnutls_strerror(ret));
510
563
/* GnuTLS server initialization */
511
ret = gnutls_dh_params_init(&mc.dh_params);
512
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
518
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
564
ret = gnutls_dh_params_init(&mc->dh_params);
565
if(ret != GNUTLS_E_SUCCESS){
566
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
567
" initialization: %s\n",
568
safer_gnutls_strerror(ret));
571
/* If a Diffie-Hellman parameters file was given, try to use it */
572
if(dhparamsfilename != NULL){
573
gnutls_datum_t params = { .data = NULL, .size = 0 };
575
int dhpfile = open(dhparamsfilename, O_RDONLY);
578
dhparamsfilename = NULL;
581
size_t params_capacity = 0;
583
params_capacity = incbuffer((char **)¶ms.data,
585
(size_t)params_capacity);
586
if(params_capacity == 0){
587
perror_plus("incbuffer");
590
dhparamsfilename = NULL;
593
ssize_t bytes_read = read(dhpfile,
594
params.data + params.size,
600
/* check bytes_read for failure */
605
dhparamsfilename = NULL;
608
params.size += (unsigned int)bytes_read;
610
if(params.data == NULL){
611
dhparamsfilename = NULL;
613
if(dhparamsfilename == NULL){
616
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
617
GNUTLS_X509_FMT_PEM);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Failed to parse DH parameters in file"
620
" \"%s\": %s\n", dhparamsfilename,
621
safer_gnutls_strerror(ret));
622
dhparamsfilename = NULL;
626
if(dhparamsfilename == NULL){
627
if(mc->dh_bits == 0){
628
/* Find out the optimal number of DH bits */
629
/* Try to read the private key file */
630
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
632
int secfile = open(seckeyfilename, O_RDONLY);
637
size_t buffer_capacity = 0;
639
buffer_capacity = incbuffer((char **)&buffer.data,
641
(size_t)buffer_capacity);
642
if(buffer_capacity == 0){
643
perror_plus("incbuffer");
648
ssize_t bytes_read = read(secfile,
649
buffer.data + buffer.size,
655
/* check bytes_read for failure */
662
buffer.size += (unsigned int)bytes_read;
666
/* If successful, use buffer to parse private key */
667
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
668
if(buffer.data != NULL){
670
gnutls_openpgp_privkey_t privkey = NULL;
671
ret = gnutls_openpgp_privkey_init(&privkey);
672
if(ret != GNUTLS_E_SUCCESS){
673
fprintf_plus(stderr, "Error initializing OpenPGP key"
675
safer_gnutls_strerror(ret));
679
ret = gnutls_openpgp_privkey_import
680
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
681
if(ret != GNUTLS_E_SUCCESS){
682
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
683
safer_gnutls_strerror(ret));
689
/* Use private key to suggest an appropriate
691
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
692
gnutls_openpgp_privkey_deinit(privkey);
694
fprintf_plus(stderr, "This OpenPGP key implies using"
695
" a GnuTLS security parameter \"%s\".\n",
696
safe_string(gnutls_sec_param_get_name
702
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
703
/* Err on the side of caution */
704
sec_param = GNUTLS_SEC_PARAM_ULTRA;
706
fprintf_plus(stderr, "Falling back to security parameter"
708
safe_string(gnutls_sec_param_get_name
713
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
717
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
718
" implies %u DH bits; using that.\n",
719
safe_string(gnutls_sec_param_get_name
724
fprintf_plus(stderr, "Failed to get implied number of DH"
725
" bits for security parameter \"%s\"): %s\n",
726
safe_string(gnutls_sec_param_get_name
728
safer_gnutls_strerror(ret));
732
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
735
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
736
if(ret != GNUTLS_E_SUCCESS){
737
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
738
" bits): %s\n", mc->dh_bits,
739
safer_gnutls_strerror(ret));
743
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
530
gnutls_certificate_free_credentials(mc.cred);
531
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
749
gnutls_certificate_free_credentials(mc->cred);
750
gnutls_dh_params_deinit(mc->dh_params);
536
static int init_gnutls_session(gnutls_session_t *session){
754
__attribute__((nonnull, warn_unused_result))
755
static int init_gnutls_session(gnutls_session_t *session,
538
758
/* GnuTLS session creation */
592
811
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
593
812
__attribute__((unused)) const char *txt){}
814
/* Set effective uid to 0, return errno */
815
__attribute__((warn_unused_result))
816
error_t raise_privileges(void){
817
error_t old_errno = errno;
818
error_t ret_errno = 0;
819
if(seteuid(0) == -1){
826
/* Set effective and real user ID to 0. Return errno. */
827
__attribute__((warn_unused_result))
828
error_t raise_privileges_permanently(void){
829
error_t old_errno = errno;
830
error_t ret_errno = raise_privileges();
842
/* Set effective user ID to unprivileged saved user ID */
843
__attribute__((warn_unused_result))
844
error_t lower_privileges(void){
845
error_t old_errno = errno;
846
error_t ret_errno = 0;
847
if(seteuid(uid) == -1){
854
/* Lower privileges permanently */
855
__attribute__((warn_unused_result))
856
error_t lower_privileges_permanently(void){
857
error_t old_errno = errno;
858
error_t ret_errno = 0;
859
if(setuid(uid) == -1){
866
/* Helper function to add_local_route() and delete_local_route() */
867
__attribute__((nonnull, warn_unused_result))
868
static bool add_delete_local_route(const bool add,
870
AvahiIfIndex if_index){
872
char helper[] = "mandos-client-iprouteadddel";
873
char add_arg[] = "add";
874
char delete_arg[] = "delete";
875
char debug_flag[] = "--debug";
876
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
877
if(pluginhelperdir == NULL){
879
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
880
" variable not set; cannot run helper\n");
885
char interface[IF_NAMESIZE];
886
if(if_indextoname((unsigned int)if_index, interface) == NULL){
887
perror_plus("if_indextoname");
891
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
893
perror_plus("open(\"/dev/null\", O_RDONLY)");
899
/* Raise privileges */
900
errno = raise_privileges_permanently();
902
perror_plus("Failed to raise privileges");
903
/* _exit(EX_NOPERM); */
909
perror_plus("setgid");
912
/* Reset supplementary groups */
914
ret = setgroups(0, NULL);
916
perror_plus("setgroups");
920
ret = dup2(devnull, STDIN_FILENO);
922
perror_plus("dup2(devnull, STDIN_FILENO)");
925
ret = close(devnull);
927
perror_plus("close");
930
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
932
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
935
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
940
if(helperdir_fd == -1){
942
_exit(EX_UNAVAILABLE);
944
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
947
perror_plus("openat");
949
_exit(EX_UNAVAILABLE);
953
#pragma GCC diagnostic push
954
#pragma GCC diagnostic ignored "-Wcast-qual"
956
if(fexecve(helper_fd, (char *const [])
957
{ helper, add ? add_arg : delete_arg, (char *)address,
958
interface, debug ? debug_flag : NULL, NULL },
961
#pragma GCC diagnostic pop
963
perror_plus("fexecve");
975
pret = waitpid(pid, &status, 0);
976
if(pret == -1 and errno == EINTR and quit_now){
977
int errno_raising = 0;
978
if((errno = raise_privileges()) != 0){
979
errno_raising = errno;
980
perror_plus("Failed to raise privileges in order to"
981
" kill helper program");
983
if(kill(pid, SIGTERM) == -1){
986
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
987
perror_plus("Failed to lower privileges after killing"
992
} while(pret == -1 and errno == EINTR);
994
perror_plus("waitpid");
997
if(WIFEXITED(status)){
998
if(WEXITSTATUS(status) != 0){
999
fprintf_plus(stderr, "Error: iprouteadddel exited"
1000
" with status %d\n", WEXITSTATUS(status));
1005
if(WIFSIGNALED(status)){
1006
fprintf_plus(stderr, "Error: iprouteadddel died by"
1007
" signal %d\n", WTERMSIG(status));
1010
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1014
__attribute__((nonnull, warn_unused_result))
1015
static bool add_local_route(const char *address,
1016
AvahiIfIndex if_index){
1018
fprintf_plus(stderr, "Adding route to %s\n", address);
1020
return add_delete_local_route(true, address, if_index);
1023
__attribute__((nonnull, warn_unused_result))
1024
static bool delete_local_route(const char *address,
1025
AvahiIfIndex if_index){
1027
fprintf_plus(stderr, "Removing route to %s\n", address);
1029
return add_delete_local_route(false, address, if_index);
595
1032
/* Called when a Mandos server is found */
596
static int start_mandos_communication(const char *ip, uint16_t port,
1033
__attribute__((nonnull, warn_unused_result))
1034
static int start_mandos_communication(const char *ip, in_port_t port,
597
1035
AvahiIfIndex if_index,
1036
int af, mandos_context *mc){
599
1037
int ret, tcp_sd = -1;
602
struct sockaddr_in in;
603
struct sockaddr_in6 in6;
1039
struct sockaddr_storage to;
605
1040
char *buffer = NULL;
606
1041
char *decrypted_buffer = NULL;
607
1042
size_t buffer_length = 0;
708
1171
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
1172
perror_plus("if_indextoname");
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
1174
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1175
"\n", ip, interface, (uintmax_t)port);
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
1178
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1179
ip, (uintmax_t)port);
718
1181
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
1182
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
722
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
725
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
729
perror_plus("inet_ntop");
731
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
743
ret = connect(tcp_sd, &to.in6, sizeof(to));
745
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
750
perror_plus("connect");
1184
ret = getnameinfo((struct sockaddr *)&to,
1185
sizeof(struct sockaddr_in6),
1186
addrstr, sizeof(addrstr), NULL, 0,
1189
ret = getnameinfo((struct sockaddr *)&to,
1190
sizeof(struct sockaddr_in),
1191
addrstr, sizeof(addrstr), NULL, 0,
1194
if(ret == EAI_SYSTEM){
1195
perror_plus("getnameinfo");
1196
} else if(ret != 0) {
1197
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1198
} else if(strcmp(addrstr, ip) != 0){
1199
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1210
ret = connect(tcp_sd, (struct sockaddr *)&to,
1211
sizeof(struct sockaddr_in6));
1213
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1214
sizeof(struct sockaddr_in));
1217
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1218
and if_index != AVAHI_IF_UNSPEC
1219
and connect_to == NULL
1220
and not route_added and
1221
((af == AF_INET6 and not
1222
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1224
or (af == AF_INET and
1225
/* Not a a IPv4LL address */
1226
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1227
& 0xFFFF0000L) != 0xA9FE0000L))){
1228
/* Work around Avahi bug - Avahi does not announce link-local
1229
addresses if it has a global address, so local hosts with
1230
*only* a link-local address (e.g. Mandos clients) cannot
1231
connect to a Mandos server announced by Avahi on a server
1232
host with a global address. Work around this by retrying
1233
with an explicit route added with the server's address.
1235
Avahi bug reference:
1236
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1237
https://bugs.debian.org/587961
1240
fprintf_plus(stderr, "Mandos server unreachable, trying"
1244
route_added = add_local_route(ip, if_index);
1250
if(errno != ECONNREFUSED or debug){
1252
perror_plus("connect");
761
1265
const char *out = mandos_protocol_version;
1078
1610
signal_received = sig;
1079
1611
int old_errno = errno;
1080
1612
/* set main loop to exit */
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1613
if(simple_poll != NULL){
1614
avahi_simple_poll_quit(simple_poll);
1084
1616
errno = old_errno;
1619
__attribute__((nonnull, warn_unused_result))
1620
bool get_flags(const char *ifname, struct ifreq *ifr){
1624
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1627
perror_plus("socket");
1631
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1632
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1633
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1637
perror_plus("ioctl SIOCGIFFLAGS");
1645
__attribute__((nonnull, warn_unused_result))
1646
bool good_flags(const char *ifname, const struct ifreq *ifr){
1648
/* Reject the loopback device */
1649
if(ifr->ifr_flags & IFF_LOOPBACK){
1651
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1656
/* Accept point-to-point devices only if connect_to is specified */
1657
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1659
fprintf_plus(stderr, "Accepting point-to-point interface"
1660
" \"%s\"\n", ifname);
1664
/* Otherwise, reject non-broadcast-capable devices */
1665
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1667
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1668
" \"%s\"\n", ifname);
1672
/* Reject non-ARP interfaces (including dummy interfaces) */
1673
if(ifr->ifr_flags & IFF_NOARP){
1675
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1681
/* Accept this device */
1683
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1088
1689
* This function determines if a directory entry in /sys/class/net
1089
1690
* corresponds to an acceptable network device.
1090
1691
* (This function is passed to scandir(3) as a filter function.)
1693
__attribute__((nonnull, warn_unused_result))
1092
1694
int good_interface(const struct dirent *if_entry){
1094
char *flagname = NULL;
1095
1695
if(if_entry->d_name[0] == '.'){
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1101
perror_plus("asprintf");
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
perror_plus("open");
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1125
perror_plus("read");
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1152
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1184
/* Accept this device */
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1700
if(not get_flags(if_entry->d_name, &ifr)){
1702
fprintf_plus(stderr, "Failed to get flags for interface "
1703
"\"%s\"\n", if_entry->d_name);
1708
if(not good_flags(if_entry->d_name, &ifr)){
1715
* This function determines if a network interface is up.
1717
__attribute__((nonnull, warn_unused_result))
1718
bool interface_is_up(const char *interface){
1720
if(not get_flags(interface, &ifr)){
1722
fprintf_plus(stderr, "Failed to get flags for interface "
1723
"\"%s\"\n", interface);
1728
return (bool)(ifr.ifr_flags & IFF_UP);
1732
* This function determines if a network interface is running
1734
__attribute__((nonnull, warn_unused_result))
1735
bool interface_is_running(const char *interface){
1737
if(not get_flags(interface, &ifr)){
1739
fprintf_plus(stderr, "Failed to get flags for interface "
1740
"\"%s\"\n", interface);
1745
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1748
__attribute__((nonnull, pure, warn_unused_result))
1192
1749
int notdotentries(const struct dirent *direntry){
1193
1750
/* Skip "." and ".." */
1194
1751
if(direntry->d_name[0] == '.'
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1760
/* Is this directory entry a runnable program? */
1761
__attribute__((nonnull, warn_unused_result))
1762
int runnable_hook(const struct dirent *direntry){
1767
if((direntry->d_name)[0] == '\0'){
1772
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1773
"abcdefghijklmnopqrstuvwxyz"
1776
if((direntry->d_name)[sret] != '\0'){
1777
/* Contains non-allowed characters */
1779
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1785
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1788
perror_plus("Could not stat hook");
1792
if(not (S_ISREG(st.st_mode))){
1793
/* Not a regular file */
1795
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1800
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1801
/* Not executable */
1803
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1809
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1815
__attribute__((nonnull, warn_unused_result))
1816
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1817
mandos_context *mc){
1205
1819
struct timespec now;
1206
1820
struct timespec waited_time;
1207
1821
intmax_t block_time;
1210
if(mc.current_server == NULL){
1212
fprintf(stderr, "Wait until first server is found. No timeout!\n");
1824
if(mc->current_server == NULL){
1826
fprintf_plus(stderr, "Wait until first server is found."
1214
1829
ret = avahi_simple_poll_iterate(s, -1);
1217
fprintf(stderr, "Check current_server if we should run it, or wait\n");
1832
fprintf_plus(stderr, "Check current_server if we should run"
1219
1835
/* the current time */
1220
1836
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1225
1841
/* Calculating in ms how long time between now and server
1226
1842
who we visted longest time ago. Now - last seen. */
1227
waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;
1228
waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;
1229
/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */
1230
block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);
1233
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1843
waited_time.tv_sec = (now.tv_sec
1844
- mc->current_server->last_seen.tv_sec);
1845
waited_time.tv_nsec = (now.tv_nsec
1846
- mc->current_server->last_seen.tv_nsec);
1847
/* total time is 10s/10,000ms.
1848
Converting to s from ms by dividing by 1,000,
1849
and ns to ms by dividing by 1,000,000. */
1850
block_time = ((retry_interval
1851
- ((intmax_t)waited_time.tv_sec * 1000))
1852
- ((intmax_t)waited_time.tv_nsec / 1000000));
1855
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1236
1859
if(block_time <= 0){
1237
ret = start_mandos_communication(mc.current_server->ip,
1238
mc.current_server->port,
1239
mc.current_server->if_index,
1240
mc.current_server->af);
1860
ret = start_mandos_communication(mc->current_server->ip,
1861
mc->current_server->port,
1862
mc->current_server->if_index,
1863
mc->current_server->af, mc);
1242
avahi_simple_poll_quit(mc.simple_poll);
1865
avahi_simple_poll_quit(s);
1245
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
1868
ret = clock_gettime(CLOCK_MONOTONIC,
1869
&mc->current_server->last_seen);
1247
1871
perror_plus("clock_gettime");
1250
mc.current_server = mc.current_server->next;
1251
block_time = 0; /* call avahi to find new mandos servers, but dont block */
1874
mc->current_server = mc->current_server->next;
1875
block_time = 0; /* Call avahi to find new Mandos
1876
servers, but don't block */
1254
1879
ret = avahi_simple_poll_iterate(s, (int)block_time);
1257
if (ret > 0 or errno != EINTR) {
1882
if(ret > 0 or errno != EINTR){
1258
1883
return (ret != 1) ? ret : 0;
1889
__attribute__((nonnull))
1890
void run_network_hooks(const char *mode, const char *interface,
1892
struct dirent **direntries = NULL;
1893
if(hookdir_fd == -1){
1894
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1896
if(hookdir_fd == -1){
1897
if(errno == ENOENT){
1899
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1900
" found\n", hookdir);
1903
perror_plus("open");
1908
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1909
runnable_hook, alphasort);
1911
perror_plus("scandir");
1914
struct dirent *direntry;
1916
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1918
perror_plus("open(\"/dev/null\", O_RDONLY)");
1921
for(int i = 0; i < numhooks; i++){
1922
direntry = direntries[i];
1924
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1927
pid_t hook_pid = fork();
1930
/* Raise privileges */
1931
errno = raise_privileges_permanently();
1933
perror_plus("Failed to raise privileges");
1940
perror_plus("setgid");
1943
/* Reset supplementary groups */
1945
ret = setgroups(0, NULL);
1947
perror_plus("setgroups");
1950
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1952
perror_plus("setenv");
1955
ret = setenv("DEVICE", interface, 1);
1957
perror_plus("setenv");
1960
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1962
perror_plus("setenv");
1965
ret = setenv("MODE", mode, 1);
1967
perror_plus("setenv");
1971
ret = asprintf(&delaystring, "%f", (double)delay);
1973
perror_plus("asprintf");
1976
ret = setenv("DELAY", delaystring, 1);
1979
perror_plus("setenv");
1983
if(connect_to != NULL){
1984
ret = setenv("CONNECT", connect_to, 1);
1986
perror_plus("setenv");
1990
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1994
perror_plus("openat");
1995
_exit(EXIT_FAILURE);
1997
if(close(hookdir_fd) == -1){
1998
perror_plus("close");
1999
_exit(EXIT_FAILURE);
2001
ret = dup2(devnull, STDIN_FILENO);
2003
perror_plus("dup2(devnull, STDIN_FILENO)");
2006
ret = close(devnull);
2008
perror_plus("close");
2011
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2013
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2016
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2018
perror_plus("fexecve");
2019
_exit(EXIT_FAILURE);
2023
perror_plus("fork");
2028
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2029
perror_plus("waitpid");
2033
if(WIFEXITED(status)){
2034
if(WEXITSTATUS(status) != 0){
2035
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2036
" with status %d\n", direntry->d_name,
2037
WEXITSTATUS(status));
2041
} else if(WIFSIGNALED(status)){
2042
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2043
" signal %d\n", direntry->d_name,
2048
fprintf_plus(stderr, "Warning: network hook \"%s\""
2049
" crashed\n", direntry->d_name);
2055
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2061
if(close(hookdir_fd) == -1){
2062
perror_plus("close");
2069
__attribute__((nonnull, warn_unused_result))
2070
error_t bring_up_interface(const char *const interface,
2072
error_t old_errno = errno;
2074
struct ifreq network;
2075
unsigned int if_index = if_nametoindex(interface);
2077
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2087
if(not interface_is_up(interface)){
2088
error_t ret_errno = 0, ioctl_errno = 0;
2089
if(not get_flags(interface, &network)){
2091
fprintf_plus(stderr, "Failed to get flags for interface "
2092
"\"%s\"\n", interface);
2096
network.ifr_flags |= IFF_UP; /* set flag */
2098
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2101
perror_plus("socket");
2109
perror_plus("close");
2116
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2120
/* Raise privileges */
2121
ret_errno = raise_privileges();
2124
perror_plus("Failed to raise privileges");
2129
bool restore_loglevel = false;
2131
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2132
messages about the network interface to mess up the prompt */
2133
ret_linux = klogctl(8, NULL, 5);
2134
if(ret_linux == -1){
2135
perror_plus("klogctl");
2137
restore_loglevel = true;
2140
#endif /* __linux__ */
2141
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2142
ioctl_errno = errno;
2144
if(restore_loglevel){
2145
ret_linux = klogctl(7, NULL, 0);
2146
if(ret_linux == -1){
2147
perror_plus("klogctl");
2150
#endif /* __linux__ */
2152
/* If raise_privileges() succeeded above */
2154
/* Lower privileges */
2155
ret_errno = lower_privileges();
2158
perror_plus("Failed to lower privileges");
2162
/* Close the socket */
2165
perror_plus("close");
2168
if(ret_setflags == -1){
2169
errno = ioctl_errno;
2170
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2175
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2179
/* Sleep checking until interface is running.
2180
Check every 0.25s, up to total time of delay */
2181
for(int i=0; i < delay * 4; i++){
2182
if(interface_is_running(interface)){
2185
struct timespec sleeptime = { .tv_nsec = 250000000 };
2186
ret = nanosleep(&sleeptime, NULL);
2187
if(ret == -1 and errno != EINTR){
2188
perror_plus("nanosleep");
2196
__attribute__((nonnull, warn_unused_result))
2197
error_t take_down_interface(const char *const interface){
2198
error_t old_errno = errno;
2199
struct ifreq network;
2200
unsigned int if_index = if_nametoindex(interface);
2202
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2206
if(interface_is_up(interface)){
2207
error_t ret_errno = 0, ioctl_errno = 0;
2208
if(not get_flags(interface, &network) and debug){
2210
fprintf_plus(stderr, "Failed to get flags for interface "
2211
"\"%s\"\n", interface);
2215
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2217
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2220
perror_plus("socket");
2226
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2230
/* Raise privileges */
2231
ret_errno = raise_privileges();
2234
perror_plus("Failed to raise privileges");
2237
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2238
ioctl_errno = errno;
2240
/* If raise_privileges() succeeded above */
2242
/* Lower privileges */
2243
ret_errno = lower_privileges();
2246
perror_plus("Failed to lower privileges");
2250
/* Close the socket */
2251
int ret = close(sd);
2253
perror_plus("close");
2256
if(ret_setflags == -1){
2257
errno = ioctl_errno;
2258
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2263
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1264
2271
int main(int argc, char *argv[]){
2272
mandos_context mc = { .server = NULL, .dh_bits = 0,
2273
.priority = "SECURE256:!CTYPE-X.509"
2274
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2275
.current_server = NULL, .interfaces = NULL,
2276
.interfaces_size = 0 };
1265
2277
AvahiSServiceBrowser *sb = NULL;
1268
2280
intmax_t tmpmax;
1270
2282
int exitcode = EXIT_SUCCESS;
1271
const char *interface = "";
1272
struct ifreq network;
1274
bool take_down_interface = false;
1277
char tempdir[] = "/tmp/mandosXXXXXX";
1278
bool tempdir_created = false;
2283
char *interfaces_to_take_down = NULL;
2284
size_t interfaces_to_take_down_size = 0;
2285
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2286
char old_tempdir[] = "/tmp/mandosXXXXXX";
2287
char *tempdir = NULL;
1279
2288
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1280
2289
const char *seckey = PATHDIR "/" SECKEY;
1281
2290
const char *pubkey = PATHDIR "/" PUBKEY;
2291
const char *dh_params_file = NULL;
2292
char *interfaces_hooks = NULL;
1283
2294
bool gnutls_initialized = false;
1284
2295
bool gpgme_initialized = false;
1285
2296
float delay = 2.5f;
1286
double retry_interval = 10; /* 10s between retrying a server and checking again*/
2297
double retry_interval = 10; /* 10s between trying a server and
2298
retrying the same server again */
1288
2300
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1289
2301
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2481
/* Work around Debian bug #633582:
2482
<http://bugs.debian.org/633582> */
2484
/* Re-raise privileges */
2485
ret_errno = raise_privileges();
2488
perror_plus("Failed to raise privileges");
2492
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2493
int seckey_fd = open(seckey, O_RDONLY);
2494
if(seckey_fd == -1){
2495
perror_plus("open");
2497
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2499
perror_plus("fstat");
2501
if(S_ISREG(st.st_mode)
2502
and st.st_uid == 0 and st.st_gid == 0){
2503
ret = fchown(seckey_fd, uid, gid);
2505
perror_plus("fchown");
2513
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2514
int pubkey_fd = open(pubkey, O_RDONLY);
2515
if(pubkey_fd == -1){
2516
perror_plus("open");
2518
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2520
perror_plus("fstat");
2522
if(S_ISREG(st.st_mode)
2523
and st.st_uid == 0 and st.st_gid == 0){
2524
ret = fchown(pubkey_fd, uid, gid);
2526
perror_plus("fchown");
2534
if(dh_params_file != NULL
2535
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2536
int dhparams_fd = open(dh_params_file, O_RDONLY);
2537
if(dhparams_fd == -1){
2538
perror_plus("open");
2540
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2542
perror_plus("fstat");
2544
if(S_ISREG(st.st_mode)
2545
and st.st_uid == 0 and st.st_gid == 0){
2546
ret = fchown(dhparams_fd, uid, gid);
2548
perror_plus("fchown");
2556
/* Lower privileges */
2557
ret_errno = lower_privileges();
2560
perror_plus("Failed to lower privileges");
2565
/* Remove invalid interface names (except "none") */
2567
char *interface = NULL;
2568
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2570
if(strcmp(interface, "none") != 0
2571
and if_nametoindex(interface) == 0){
2572
if(interface[0] != '\0'){
2573
fprintf_plus(stderr, "Not using nonexisting interface"
2574
" \"%s\"\n", interface);
2576
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2582
/* Run network hooks */
2584
if(mc.interfaces != NULL){
2585
interfaces_hooks = malloc(mc.interfaces_size);
2586
if(interfaces_hooks == NULL){
2587
perror_plus("malloc");
2590
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2591
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2593
run_network_hooks("start", interfaces_hooks != NULL ?
2594
interfaces_hooks : "", delay);
1449
2598
avahi_set_log_function(empty_log);
1452
if(interface[0] == '\0'){
1453
struct dirent **direntries;
1454
ret = scandir(sys_class_net, &direntries, good_interface,
1457
/* Pick the first good interface */
1458
interface = strdup(direntries[0]->d_name);
1460
fprintf(stderr, "Using interface \"%s\"\n", interface);
1462
if(interface == NULL){
1463
perror_plus("malloc");
1465
exitcode = EXIT_FAILURE;
1471
fprintf(stderr, "Could not find a network interface\n");
1472
exitcode = EXIT_FAILURE;
1477
2601
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1478
2602
from the signal handler */
1479
2603
/* Initialize the pseudo-RNG for Avahi */
1480
2604
srand((unsigned int) time(NULL));
1481
mc.simple_poll = avahi_simple_poll_new();
1482
if(mc.simple_poll == NULL){
1483
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2605
simple_poll = avahi_simple_poll_new();
2606
if(simple_poll == NULL){
2607
fprintf_plus(stderr,
2608
"Avahi: Failed to create simple poll object.\n");
1484
2609
exitcode = EX_UNAVAILABLE;
1551
/* If the interface is down, bring it up */
1552
if(strcmp(interface, "none") != 0){
1553
if_index = (AvahiIfIndex) if_nametoindex(interface);
1555
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1556
exitcode = EX_UNAVAILABLE;
1564
/* Re-raise priviliges */
1568
perror_plus("seteuid");
1572
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1573
messages about the network interface to mess up the prompt */
1574
ret = klogctl(8, NULL, 5);
1575
bool restore_loglevel = true;
1577
restore_loglevel = false;
1578
perror_plus("klogctl");
1580
#endif /* __linux__ */
1582
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1584
perror_plus("socket");
1585
exitcode = EX_OSERR;
1587
if(restore_loglevel){
1588
ret = klogctl(7, NULL, 0);
1590
perror_plus("klogctl");
1593
#endif /* __linux__ */
1594
/* Lower privileges */
1598
perror_plus("seteuid");
1602
strcpy(network.ifr_name, interface);
1603
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1605
perror_plus("ioctl SIOCGIFFLAGS");
1607
if(restore_loglevel){
1608
ret = klogctl(7, NULL, 0);
1610
perror_plus("klogctl");
1613
#endif /* __linux__ */
1614
exitcode = EX_OSERR;
1615
/* Lower privileges */
1619
perror_plus("seteuid");
1623
if((network.ifr_flags & IFF_UP) == 0){
1624
network.ifr_flags |= IFF_UP;
1625
take_down_interface = true;
1626
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1628
take_down_interface = false;
1629
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1630
exitcode = EX_OSERR;
1632
if(restore_loglevel){
1633
ret = klogctl(7, NULL, 0);
1635
perror_plus("klogctl");
2676
/* If no interfaces were specified, make a list */
2677
if(mc.interfaces == NULL){
2678
struct dirent **direntries = NULL;
2679
/* Look for any good interfaces */
2680
ret = scandir(sys_class_net, &direntries, good_interface,
2683
/* Add all found interfaces to interfaces list */
2684
for(int i = 0; i < ret; ++i){
2685
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2686
direntries[i]->d_name);
2689
perror_plus("argz_add");
2690
free(direntries[i]);
2694
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2695
direntries[i]->d_name);
2697
free(direntries[i]);
2704
fprintf_plus(stderr, "Could not find a network interface\n");
2705
exitcode = EXIT_FAILURE;
2710
/* Bring up interfaces which are down, and remove any "none"s */
2712
char *interface = NULL;
2713
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2715
/* If interface name is "none", stop bringing up interfaces.
2716
Also remove all instances of "none" from the list */
2717
if(strcmp(interface, "none") == 0){
2718
argz_delete(&mc.interfaces, &mc.interfaces_size,
2721
while((interface = argz_next(mc.interfaces,
2722
mc.interfaces_size, interface))){
2723
if(strcmp(interface, "none") == 0){
2724
argz_delete(&mc.interfaces, &mc.interfaces_size,
1638
#endif /* __linux__ */
1639
/* Lower privileges */
1643
perror_plus("seteuid");
1648
/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */
1649
for(int i=0; i < delay * 4; i++){
1650
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1652
perror_plus("ioctl SIOCGIFFLAGS");
1653
} else if(network.ifr_flags & IFF_RUNNING){
1656
struct timespec sleeptime = { .tv_nsec = 250000000 };
1657
ret = nanosleep(&sleeptime, NULL);
1658
if(ret == -1 and errno != EINTR){
1659
perror_plus("nanosleep");
1662
if(not take_down_interface){
1663
/* We won't need the socket anymore */
1664
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1666
perror_plus("close");
1670
if(restore_loglevel){
1671
/* Restores kernel loglevel to default */
1672
ret = klogctl(7, NULL, 0);
1674
perror_plus("klogctl");
1677
#endif /* __linux__ */
1678
/* Lower privileges */
1680
if(take_down_interface){
1681
/* Lower privileges */
1684
perror_plus("seteuid");
1687
/* Lower privileges permanently */
1690
perror_plus("setuid");
2731
bool interface_was_up = interface_is_up(interface);
2732
errno = bring_up_interface(interface, delay);
2733
if(not interface_was_up){
2735
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2736
" %s\n", interface, strerror(errno));
2738
errno = argz_add(&interfaces_to_take_down,
2739
&interfaces_to_take_down_size,
2742
perror_plus("argz_add");
2747
if(debug and (interfaces_to_take_down == NULL)){
2748
fprintf_plus(stderr, "No interfaces were brought up\n");
2752
/* If we only got one interface, explicitly use only that one */
2753
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2755
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2758
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1699
ret = init_gnutls_global(pubkey, seckey);
2765
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1701
fprintf(stderr, "init_gnutls_global failed\n");
2767
fprintf_plus(stderr, "init_gnutls_global failed\n");
1702
2768
exitcode = EX_UNAVAILABLE;
1841
2927
/* Run the main loop */
1844
fprintf(stderr, "Starting Avahi loop search\n");
2930
fprintf_plus(stderr, "Starting Avahi loop search\n");
1847
ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));
2933
ret = avahi_loop_with_timeout(simple_poll,
2934
(int)(retry_interval * 1000), &mc);
1849
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1850
(ret == 0) ? "successfully" : "with error");
2936
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2937
(ret == 0) ? "successfully" : "with error");
1856
fprintf(stderr, "%s exiting\n", argv[0]);
2943
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1859
2946
/* Cleanup things */
2947
free(mc.interfaces);
1861
2950
avahi_s_service_browser_free(sb);
1863
2952
if(mc.server != NULL)
1864
2953
avahi_server_free(mc.server);
1866
if(mc.simple_poll != NULL)
1867
avahi_simple_poll_free(mc.simple_poll);
2955
if(simple_poll != NULL)
2956
avahi_simple_poll_free(simple_poll);
1869
2958
if(gnutls_initialized){
1870
2959
gnutls_certificate_free_credentials(mc.cred);
1871
gnutls_global_deinit();
1872
2960
gnutls_dh_params_deinit(mc.dh_params);
1875
2963
if(gpgme_initialized){
1876
2964
gpgme_release(mc.ctx);
1879
/* cleans up the circular linked list of mandos servers the client has seen */
2967
/* Cleans up the circular linked list of Mandos servers the client
1880
2969
if(mc.current_server != NULL){
1881
2970
mc.current_server->prev->next = NULL;
1882
2971
while(mc.current_server != NULL){
1883
2972
server *next = mc.current_server->next;
2974
#pragma GCC diagnostic push
2975
#pragma GCC diagnostic ignored "-Wcast-qual"
2977
free((char *)(mc.current_server->ip));
2979
#pragma GCC diagnostic pop
1884
2981
free(mc.current_server);
1885
2982
mc.current_server = next;
1889
/* Take down the network interface */
1890
if(take_down_interface){
1891
/* Re-raise priviliges */
1895
perror_plus("seteuid");
2986
/* Re-raise privileges */
2988
ret_errno = raise_privileges();
2991
perror_plus("Failed to raise privileges");
2994
/* Run network hooks */
2995
run_network_hooks("stop", interfaces_hooks != NULL ?
2996
interfaces_hooks : "", delay);
2998
/* Take down the network interfaces which were brought up */
3000
char *interface = NULL;
3001
while((interface=argz_next(interfaces_to_take_down,
3002
interfaces_to_take_down_size,
3004
ret_errno = take_down_interface(interface);
3007
perror_plus("Failed to take down interface");
3010
if(debug and (interfaces_to_take_down == NULL)){
3011
fprintf_plus(stderr, "No interfaces needed to be taken"
1898
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1900
perror_plus("ioctl SIOCGIFFLAGS");
1901
} else if(network.ifr_flags & IFF_UP) {
1902
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1903
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1905
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1908
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1910
perror_plus("close");
1912
/* Lower privileges permanently */
1916
perror_plus("setuid");
3017
ret_errno = lower_privileges_permanently();
3020
perror_plus("Failed to lower privileges permanently");
3024
free(interfaces_to_take_down);
3025
free(interfaces_hooks);
1921
3027
/* Removes the GPGME temp directory and all files inside */
1922
if(tempdir_created){
3028
if(tempdir != NULL){
1923
3029
struct dirent **direntries = NULL;
1924
struct dirent *direntry = NULL;
1925
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1927
for(int i = 0; i < ret; i++){
1928
direntry = direntries[i];
1929
char *fullname = NULL;
1930
ret = asprintf(&fullname, "%s/%s", tempdir,
1933
perror_plus("asprintf");
1936
ret = remove(fullname);
1938
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
3030
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3034
if(tempdir_fd == -1){
3035
perror_plus("open");
3037
int numentries = scandirat(tempdir_fd, ".", &direntries,
3038
notdotentries, alphasort);
3039
if(numentries >= 0){
3040
for(int i = 0; i < numentries; i++){
3041
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3043
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3044
" \"%s\", 0): %s\n", tempdir,
3045
direntries[i]->d_name, strerror(errno));
3047
free(direntries[i]);
3050
/* need to clean even if 0 because man page doesn't specify */
3052
if(numentries == -1){
3053
perror_plus("scandir");
3055
ret = rmdir(tempdir);
3056
if(ret == -1 and errno != ENOENT){
3057
perror_plus("rmdir");
1945
/* need to be cleaned even if ret == 0 because man page dont specify */
1948
perror_plus("scandir");
1950
ret = rmdir(tempdir);
1951
if(ret == -1 and errno != ENOENT){
1952
perror_plus("rmdir");