145
105
#define PATHDIR "/conf/conf.d/mandos"
146
106
#define SECKEY "seckey.txt"
147
107
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
150
#define HOOKDIR "/lib/mandos/network-hooks.d"
152
109
bool debug = false;
153
110
static const char mandos_protocol_version[] = "1";
154
111
const char *argp_program_version = "mandos-client " VERSION;
155
const char *argp_program_bug_address = "<mandos@recompile.se>";
156
static const char sys_class_net[] = "/sys/class/net";
157
char *connect_to = NULL;
158
const char *hookdir = HOOKDIR;
163
/* Doubly linked list that need to be circularly linked when used */
164
typedef struct server{
167
AvahiIfIndex if_index;
169
struct timespec last_seen;
112
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
174
114
/* Used for passing in values through the Avahi callback functions */
116
AvahiSimplePoll *simple_poll;
176
117
AvahiServer *server;
177
118
gnutls_certificate_credentials_t cred;
178
119
unsigned int dh_bits;
179
120
gnutls_dh_params_t dh_params;
180
121
const char *priority;
182
server *current_server;
184
size_t interfaces_size;
185
123
} mandos_context;
187
/* global so signal handler can reach it*/
188
AvahiSimplePoll *simple_poll;
190
sig_atomic_t quit_now = 0;
191
int signal_received = 0;
193
/* Function to use when printing errors */
194
void perror_plus(const char *print_text){
196
fprintf(stderr, "Mandos plugin %s: ",
197
program_invocation_short_name);
202
__attribute__((format (gnu_printf, 2, 3), nonnull))
203
int fprintf_plus(FILE *stream, const char *format, ...){
205
va_start (ap, format);
207
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
208
program_invocation_short_name));
209
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
213
* Make additional room in "buffer" for at least BUFFER_SIZE more
214
* bytes. "buffer_capacity" is how much is currently allocated,
126
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
127
* "buffer_capacity" is how much is currently allocated,
215
128
* "buffer_length" is how much is already used.
217
__attribute__((nonnull, warn_unused_result))
218
size_t incbuffer(char **buffer, size_t buffer_length,
219
size_t buffer_capacity){
220
if(buffer_length + BUFFER_SIZE > buffer_capacity){
221
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
223
int old_errno = errno;
130
size_t adjustbuffer(char **buffer, size_t buffer_length,
131
size_t buffer_capacity){
132
if (buffer_length + BUFFER_SIZE > buffer_capacity){
133
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
230
137
buffer_capacity += BUFFER_SIZE;
232
139
return buffer_capacity;
235
/* Add server to set of servers to retry periodically */
236
__attribute__((nonnull, warn_unused_result))
237
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
238
int af, server **current_server){
240
server *new_server = malloc(sizeof(server));
241
if(new_server == NULL){
242
perror_plus("malloc");
245
*new_server = (server){ .ip = strdup(ip),
247
.if_index = if_index,
249
if(new_server->ip == NULL){
250
perror_plus("strdup");
254
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
256
perror_plus("clock_gettime");
258
#pragma GCC diagnostic push
259
#pragma GCC diagnostic ignored "-Wcast-qual"
261
free((char *)(new_server->ip));
263
#pragma GCC diagnostic pop
268
/* Special case of first server */
269
if(*current_server == NULL){
270
new_server->next = new_server;
271
new_server->prev = new_server;
272
*current_server = new_server;
274
/* Place the new server last in the list */
275
new_server->next = *current_server;
276
new_server->prev = (*current_server)->prev;
277
new_server->prev->next = new_server;
278
(*current_server)->prev = new_server;
283
/* Set effective uid to 0, return errno */
284
__attribute__((warn_unused_result))
285
int raise_privileges(void){
286
int old_errno = errno;
288
if(seteuid(0) == -1){
295
/* Set effective and real user ID to 0. Return errno. */
296
__attribute__((warn_unused_result))
297
int raise_privileges_permanently(void){
298
int old_errno = errno;
299
int ret = raise_privileges();
311
/* Set effective user ID to unprivileged saved user ID */
312
__attribute__((warn_unused_result))
313
int lower_privileges(void){
314
int old_errno = errno;
316
if(seteuid(uid) == -1){
323
/* Lower privileges permanently */
324
__attribute__((warn_unused_result))
325
int lower_privileges_permanently(void){
326
int old_errno = errno;
328
if(setuid(uid) == -1){
336
143
* Initialize GPGME.
338
__attribute__((nonnull, warn_unused_result))
339
static bool init_gpgme(const char * const seckey,
340
const char * const pubkey,
341
const char * const tempdir,
145
static bool init_gpgme(mandos_context *mc, const char *seckey,
146
const char *pubkey, const char *tempdir){
343
148
gpgme_error_t rc;
344
149
gpgme_engine_info_t engine_info;
347
* Helper function to insert pub and seckey to the engine keyring.
153
* Helper function to insert pub and seckey to the enigne keyring.
349
bool import_key(const char * const filename){
155
bool import_key(const char *filename){
352
157
gpgme_data_t pgp_data;
354
159
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
360
/* Workaround for systems without a real-time clock; see also
361
Debian bug #894495: <https://bugs.debian.org/894495> */
364
time_t currtime = time(NULL);
365
if(currtime != (time_t)-1){
367
if(gmtime_r(&currtime, &tm) == NULL) {
368
perror_plus("gmtime_r");
371
if(tm.tm_year != 70 or tm.tm_mon != 0){
375
fprintf_plus(stderr, "System clock is January 1970");
379
fprintf_plus(stderr, "System clock is invalid");
384
ret = fstat(fd, &keystat);
386
perror_plus("fstat");
389
ret = raise_privileges();
392
perror_plus("Failed to raise privileges");
397
"Setting system clock to key file mtime");
399
if(clock_settime(CLOCK_REALTIME, &keystat.st_mtim) != 0){
400
perror_plus("clock_settime");
402
ret = lower_privileges();
405
perror_plus("Failed to lower privileges");
409
165
rc = gpgme_data_new_from_fd(&pgp_data, fd);
410
if(rc != GPG_ERR_NO_ERROR){
411
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
412
gpgme_strsource(rc), gpgme_strerror(rc));
166
if (rc != GPG_ERR_NO_ERROR){
167
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
168
gpgme_strsource(rc), gpgme_strerror(rc));
416
172
rc = gpgme_op_import(mc->ctx, pgp_data);
417
if(rc != GPG_ERR_NO_ERROR){
418
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
419
gpgme_strsource(rc), gpgme_strerror(rc));
173
if (rc != GPG_ERR_NO_ERROR){
174
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
423
gpgme_import_result_t import_result
424
= gpgme_op_import_result(mc->ctx);
425
if((import_result->imported < 1
426
or import_result->not_imported > 0)
427
and import_result->unchanged == 0){
428
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
430
"The total number of considered keys: %d\n",
431
import_result->considered);
433
"The number of keys without user ID: %d\n",
434
import_result->no_user_id);
436
"The total number of imported keys: %d\n",
437
import_result->imported);
438
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
439
import_result->imported_rsa);
440
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
441
import_result->unchanged);
442
fprintf_plus(stderr, "The number of new user IDs: %d\n",
443
import_result->new_user_ids);
444
fprintf_plus(stderr, "The number of new sub keys: %d\n",
445
import_result->new_sub_keys);
446
fprintf_plus(stderr, "The number of new signatures: %d\n",
447
import_result->new_signatures);
448
fprintf_plus(stderr, "The number of new revocations: %d\n",
449
import_result->new_revocations);
451
"The total number of secret keys read: %d\n",
452
import_result->secret_read);
454
"The number of imported secret keys: %d\n",
455
import_result->secret_imported);
457
"The number of unchanged secret keys: %d\n",
458
import_result->secret_unchanged);
459
fprintf_plus(stderr, "The number of keys not imported: %d\n",
460
import_result->not_imported);
461
for(gpgme_import_status_t import_status
462
= import_result->imports;
463
import_status != NULL;
464
import_status = import_status->next){
465
fprintf_plus(stderr, "Import status for key: %s\n",
467
if(import_status->result != GPG_ERR_NO_ERROR){
468
fprintf_plus(stderr, "Import result: %s: %s\n",
469
gpgme_strsource(import_status->result),
470
gpgme_strerror(import_status->result));
472
fprintf_plus(stderr, "Key status:\n");
474
import_status->status & GPGME_IMPORT_NEW
475
? "The key was new.\n"
476
: "The key was not new.\n");
478
import_status->status & GPGME_IMPORT_UID
479
? "The key contained new user IDs.\n"
480
: "The key did not contain new user IDs.\n");
482
import_status->status & GPGME_IMPORT_SIG
483
? "The key contained new signatures.\n"
484
: "The key did not contain new signatures.\n");
486
import_status->status & GPGME_IMPORT_SUBKEY
487
? "The key contained new sub keys.\n"
488
: "The key did not contain new sub keys.\n");
490
import_status->status & GPGME_IMPORT_SECRET
491
? "The key contained a secret key.\n"
492
: "The key did not contain a secret key.\n");
179
ret = (int)TEMP_FAILURE_RETRY(close(fd));
500
perror_plus("close");
502
183
gpgme_data_release(pgp_data);
507
fprintf_plus(stderr, "Initializing GPGME\n");
188
fprintf(stderr, "Initialize gpgme\n");
511
192
gpgme_check_version(NULL);
512
193
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
513
if(rc != GPG_ERR_NO_ERROR){
514
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
515
gpgme_strsource(rc), gpgme_strerror(rc));
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
196
gpgme_strsource(rc), gpgme_strerror(rc));
519
/* Set GPGME home directory for the OpenPGP engine only */
520
rc = gpgme_get_engine_info(&engine_info);
521
if(rc != GPG_ERR_NO_ERROR){
522
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
523
gpgme_strsource(rc), gpgme_strerror(rc));
200
/* Set GPGME home directory for the OpenPGP engine only */
201
rc = gpgme_get_engine_info (&engine_info);
202
if (rc != GPG_ERR_NO_ERROR){
203
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
204
gpgme_strsource(rc), gpgme_strerror(rc));
526
207
while(engine_info != NULL){
722
401
/* OpenPGP credentials */
723
ret = gnutls_certificate_allocate_credentials(&mc->cred);
724
if(ret != GNUTLS_E_SUCCESS){
725
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
726
safer_gnutls_strerror(ret));
402
gnutls_certificate_allocate_credentials(&mc->cred);
403
if (ret != GNUTLS_E_SUCCESS){
404
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
406
safer_gnutls_strerror(ret));
407
gnutls_global_deinit ();
731
fprintf_plus(stderr, "Attempting to use public key %s and"
732
" private key %s as GnuTLS credentials\n",
412
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
413
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
737
#if GNUTLS_VERSION_NUMBER >= 0x030606
738
ret = gnutls_certificate_set_rawpk_key_file
739
(mc->cred, pubkeyfilename, seckeyfilename,
740
GNUTLS_X509_FMT_PEM, /* format */
743
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
745
0, /* names_length */
747
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
748
0); /* pkcs11_flags */
749
#elif GNUTLS_VERSION_NUMBER < 0x030600
750
417
ret = gnutls_certificate_set_openpgp_key_file
751
418
(mc->cred, pubkeyfilename, seckeyfilename,
752
419
GNUTLS_OPENPGP_FMT_BASE64);
754
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
756
if(ret != GNUTLS_E_SUCCESS){
758
"Error[%d] while reading the key pair ('%s',"
759
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
760
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
761
safer_gnutls_strerror(ret));
420
if (ret != GNUTLS_E_SUCCESS) {
422
"Error[%d] while reading the OpenPGP key pair ('%s',"
423
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
424
fprintf(stderr, "The GnuTLS error is: %s\n",
425
safer_gnutls_strerror(ret));
765
429
/* GnuTLS server initialization */
766
430
ret = gnutls_dh_params_init(&mc->dh_params);
767
if(ret != GNUTLS_E_SUCCESS){
768
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
769
" initialization: %s\n",
770
safer_gnutls_strerror(ret));
773
/* If a Diffie-Hellman parameters file was given, try to use it */
774
if(dhparamsfilename != NULL){
775
gnutls_datum_t params = { .data = NULL, .size = 0 };
777
int dhpfile = open(dhparamsfilename, O_RDONLY);
780
dhparamsfilename = NULL;
783
size_t params_capacity = 0;
785
params_capacity = incbuffer((char **)¶ms.data,
787
(size_t)params_capacity);
788
if(params_capacity == 0){
789
perror_plus("incbuffer");
792
dhparamsfilename = NULL;
795
ssize_t bytes_read = read(dhpfile,
796
params.data + params.size,
802
/* check bytes_read for failure */
807
dhparamsfilename = NULL;
810
params.size += (unsigned int)bytes_read;
812
ret = close(dhpfile);
814
perror_plus("close");
816
if(params.data == NULL){
817
dhparamsfilename = NULL;
819
if(dhparamsfilename == NULL){
822
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
823
GNUTLS_X509_FMT_PEM);
824
if(ret != GNUTLS_E_SUCCESS){
825
fprintf_plus(stderr, "Failed to parse DH parameters in file"
826
" \"%s\": %s\n", dhparamsfilename,
827
safer_gnutls_strerror(ret));
828
dhparamsfilename = NULL;
833
if(dhparamsfilename == NULL){
834
if(mc->dh_bits == 0){
835
#if GNUTLS_VERSION_NUMBER < 0x030600
836
/* Find out the optimal number of DH bits */
837
/* Try to read the private key file */
838
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
840
int secfile = open(seckeyfilename, O_RDONLY);
845
size_t buffer_capacity = 0;
847
buffer_capacity = incbuffer((char **)&buffer.data,
849
(size_t)buffer_capacity);
850
if(buffer_capacity == 0){
851
perror_plus("incbuffer");
856
ssize_t bytes_read = read(secfile,
857
buffer.data + buffer.size,
863
/* check bytes_read for failure */
870
buffer.size += (unsigned int)bytes_read;
874
/* If successful, use buffer to parse private key */
875
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
876
if(buffer.data != NULL){
878
gnutls_openpgp_privkey_t privkey = NULL;
879
ret = gnutls_openpgp_privkey_init(&privkey);
880
if(ret != GNUTLS_E_SUCCESS){
881
fprintf_plus(stderr, "Error initializing OpenPGP key"
883
safer_gnutls_strerror(ret));
887
ret = gnutls_openpgp_privkey_import
888
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
889
if(ret != GNUTLS_E_SUCCESS){
890
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
891
safer_gnutls_strerror(ret));
897
/* Use private key to suggest an appropriate
899
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
900
gnutls_openpgp_privkey_deinit(privkey);
902
fprintf_plus(stderr, "This OpenPGP key implies using"
903
" a GnuTLS security parameter \"%s\".\n",
904
safe_string(gnutls_sec_param_get_name
910
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
911
/* Err on the side of caution */
912
sec_param = GNUTLS_SEC_PARAM_ULTRA;
914
fprintf_plus(stderr, "Falling back to security parameter"
916
safe_string(gnutls_sec_param_get_name
921
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
925
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
926
" implies %u DH bits; using that.\n",
927
safe_string(gnutls_sec_param_get_name
932
fprintf_plus(stderr, "Failed to get implied number of DH"
933
" bits for security parameter \"%s\"): %s\n",
934
safe_string(gnutls_sec_param_get_name
936
safer_gnutls_strerror(ret));
940
} else { /* dh_bits != 0 */
942
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
945
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
946
if(ret != GNUTLS_E_SUCCESS){
947
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
948
" bits): %s\n", mc->dh_bits,
949
safer_gnutls_strerror(ret));
952
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
431
if (ret != GNUTLS_E_SUCCESS) {
432
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
433
" %s\n", safer_gnutls_strerror(ret));
436
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
437
if (ret != GNUTLS_E_SUCCESS) {
438
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
439
safer_gnutls_strerror(ret));
443
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
960
449
gnutls_certificate_free_credentials(mc->cred);
450
gnutls_global_deinit();
961
451
gnutls_dh_params_deinit(mc->dh_params);
965
__attribute__((nonnull, warn_unused_result))
966
static int init_gnutls_session(gnutls_session_t *session,
455
static int init_gnutls_session(mandos_context *mc,
456
gnutls_session_t *session){
969
458
/* GnuTLS session creation */
971
ret = gnutls_init(session, (GNUTLS_SERVER
972
#if GNUTLS_VERSION_NUMBER >= 0x030506
975
#if GNUTLS_VERSION_NUMBER >= 0x030606
976
| GNUTLS_ENABLE_RAWPK
982
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
983
if(ret != GNUTLS_E_SUCCESS){
985
"Error in GnuTLS session initialization: %s\n",
986
safer_gnutls_strerror(ret));
459
ret = gnutls_init(session, GNUTLS_SERVER);
460
if (ret != GNUTLS_E_SUCCESS){
461
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
462
safer_gnutls_strerror(ret));
992
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
994
gnutls_deinit(*session);
997
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
998
if(ret != GNUTLS_E_SUCCESS){
999
fprintf_plus(stderr, "Syntax error at: %s\n", err);
1000
fprintf_plus(stderr, "GnuTLS error: %s\n",
1001
safer_gnutls_strerror(ret));
1002
gnutls_deinit(*session);
467
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
468
if (ret != GNUTLS_E_SUCCESS) {
469
fprintf(stderr, "Syntax error at: %s\n", err);
470
fprintf(stderr, "GnuTLS error: %s\n",
471
safer_gnutls_strerror(ret));
472
gnutls_deinit (*session);
1008
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
1011
gnutls_deinit(*session);
1014
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
1015
if(ret != GNUTLS_E_SUCCESS){
1016
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
1017
safer_gnutls_strerror(ret));
1018
gnutls_deinit(*session);
477
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
479
if (ret != GNUTLS_E_SUCCESS) {
480
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
481
safer_gnutls_strerror(ret));
482
gnutls_deinit (*session);
1022
486
/* ignore client certificate if any. */
1023
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
487
gnutls_certificate_server_set_request (*session,
490
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
1029
496
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1030
497
__attribute__((unused)) const char *txt){}
1032
/* Helper function to add_local_route() and delete_local_route() */
1033
__attribute__((nonnull, warn_unused_result))
1034
static bool add_delete_local_route(const bool add,
1035
const char *address,
1036
AvahiIfIndex if_index){
1038
char helper[] = "mandos-client-iprouteadddel";
1039
char add_arg[] = "add";
1040
char delete_arg[] = "delete";
1041
char debug_flag[] = "--debug";
1042
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1043
if(pluginhelperdir == NULL){
1045
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1046
" variable not set; cannot run helper\n");
1051
char interface[IF_NAMESIZE];
1052
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1053
perror_plus("if_indextoname");
1057
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1059
perror_plus("open(\"/dev/null\", O_RDONLY)");
1065
/* Raise privileges */
1066
errno = raise_privileges_permanently();
1068
perror_plus("Failed to raise privileges");
1069
/* _exit(EX_NOPERM); */
1075
perror_plus("setgid");
1079
/* Reset supplementary groups */
1081
ret = setgroups(0, NULL);
1083
perror_plus("setgroups");
1088
ret = dup2(devnull, STDIN_FILENO);
1090
perror_plus("dup2(devnull, STDIN_FILENO)");
1094
ret = close(devnull);
1096
perror_plus("close");
1098
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1100
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1103
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1108
if(helperdir_fd == -1){
1109
perror_plus("open");
1110
_exit(EX_UNAVAILABLE);
1112
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1114
if(helper_fd == -1){
1115
perror_plus("openat");
1116
close(helperdir_fd);
1117
_exit(EX_UNAVAILABLE);
1119
close(helperdir_fd);
1121
#pragma GCC diagnostic push
1122
#pragma GCC diagnostic ignored "-Wcast-qual"
1124
if(fexecve(helper_fd, (char *const [])
1125
{ helper, add ? add_arg : delete_arg, (char *)address,
1126
interface, debug ? debug_flag : NULL, NULL },
1129
#pragma GCC diagnostic pop
1131
perror_plus("fexecve");
1132
_exit(EXIT_FAILURE);
1136
perror_plus("fork");
1140
ret = close(devnull);
1142
perror_plus("close");
1148
pret = waitpid(pid, &status, 0);
1149
if(pret == -1 and errno == EINTR and quit_now){
1150
int errno_raising = 0;
1151
if((errno = raise_privileges()) != 0){
1152
errno_raising = errno;
1153
perror_plus("Failed to raise privileges in order to"
1154
" kill helper program");
1156
if(kill(pid, SIGTERM) == -1){
1157
perror_plus("kill");
1159
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1160
perror_plus("Failed to lower privileges after killing"
1165
} while(pret == -1 and errno == EINTR);
1167
perror_plus("waitpid");
1170
if(WIFEXITED(status)){
1171
if(WEXITSTATUS(status) != 0){
1172
fprintf_plus(stderr, "Error: iprouteadddel exited"
1173
" with status %d\n", WEXITSTATUS(status));
1178
if(WIFSIGNALED(status)){
1179
fprintf_plus(stderr, "Error: iprouteadddel died by"
1180
" signal %d\n", WTERMSIG(status));
1183
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1187
__attribute__((nonnull, warn_unused_result))
1188
static bool add_local_route(const char *address,
1189
AvahiIfIndex if_index){
1191
fprintf_plus(stderr, "Adding route to %s\n", address);
1193
return add_delete_local_route(true, address, if_index);
1196
__attribute__((nonnull, warn_unused_result))
1197
static bool delete_local_route(const char *address,
1198
AvahiIfIndex if_index){
1200
fprintf_plus(stderr, "Removing route to %s\n", address);
1202
return add_delete_local_route(false, address, if_index);
1205
499
/* Called when a Mandos server is found */
1206
__attribute__((nonnull, warn_unused_result))
1207
static int start_mandos_communication(const char *ip, in_port_t port,
500
static int start_mandos_communication(const char *ip, uint16_t port,
1208
501
AvahiIfIndex if_index,
1209
int af, mandos_context *mc){
1210
int ret, tcp_sd = -1;
1212
struct sockaddr_storage to;
505
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1213
506
char *buffer = NULL;
1214
char *decrypted_buffer = NULL;
507
char *decrypted_buffer;
1215
508
size_t buffer_length = 0;
1216
509
size_t buffer_capacity = 0;
510
ssize_t decrypted_buffer_size;
513
char interface[IF_NAMESIZE];
1219
514
gnutls_session_t session;
1220
int pf; /* Protocol family */
1221
bool route_added = false;
1238
fprintf_plus(stderr, "Bad address family: %d\n", af);
1243
/* If the interface is specified and we have a list of interfaces */
1244
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1245
/* Check if the interface is one of the interfaces we are using */
1248
char *interface = NULL;
1249
while((interface = argz_next(mc->interfaces,
1250
mc->interfaces_size,
1252
if(if_nametoindex(interface) == (unsigned int)if_index){
1259
/* This interface does not match any in the list, so we don't
1260
connect to the server */
1262
char interface[IF_NAMESIZE];
1263
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1264
perror_plus("if_indextoname");
1266
fprintf_plus(stderr, "Skipping server on non-used interface"
1268
if_indextoname((unsigned int)if_index,
516
ret = init_gnutls_session (mc, &session);
522
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
526
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
533
if(if_indextoname((unsigned int)if_index, interface) == NULL){
534
perror("if_indextoname");
537
fprintf(stderr, "Binding to interface %s\n", interface);
1276
ret = init_gnutls_session(&session, mc);
540
memset(&to, 0, sizeof(to));
541
to.in6.sin6_family = AF_INET6;
542
/* It would be nice to have a way to detect if we were passed an
543
IPv4 address here. Now we assume an IPv6 address. */
544
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
1282
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1283
PRIuMAX "\n", ip, (uintmax_t)port);
1286
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1289
perror_plus("socket");
1300
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1301
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1302
ret = inet_pton(af, ip, &to6->sin6_addr);
1304
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1305
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1306
ret = inet_pton(af, ip, &to4->sin_addr);
1310
perror_plus("inet_pton");
1316
fprintf_plus(stderr, "Bad address: %s\n", ip);
1321
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1322
if(IN6_IS_ADDR_LINKLOCAL
1323
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1324
if(if_index == AVAHI_IF_UNSPEC){
1325
fprintf_plus(stderr, "An IPv6 link-local address is"
1326
" incomplete without a network interface\n");
1330
/* Set the network interface number as scope */
1331
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1334
((struct sockaddr_in *)&to)->sin_port = htons(port);
550
fprintf(stderr, "Bad address: %s\n", ip);
553
to.in6.sin6_port = htons(port); /* Spurious warning */
555
to.in6.sin6_scope_id = (uint32_t)if_index;
1343
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1344
char interface[IF_NAMESIZE];
1345
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1346
perror_plus("if_indextoname");
1348
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1349
"\n", ip, interface, (uintmax_t)port);
1352
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1353
ip, (uintmax_t)port);
1355
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1356
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1358
ret = getnameinfo((struct sockaddr *)&to,
1359
sizeof(struct sockaddr_in6),
1360
addrstr, sizeof(addrstr), NULL, 0,
1363
ret = getnameinfo((struct sockaddr *)&to,
1364
sizeof(struct sockaddr_in),
1365
addrstr, sizeof(addrstr), NULL, 0,
1368
if(ret == EAI_SYSTEM){
1369
perror_plus("getnameinfo");
1370
} else if(ret != 0) {
1371
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1372
} else if(strcmp(addrstr, ip) != 0){
1373
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1384
ret = connect(tcp_sd, (struct sockaddr *)&to,
1385
sizeof(struct sockaddr_in6));
1387
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1388
sizeof(struct sockaddr_in));
1391
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1392
and if_index != AVAHI_IF_UNSPEC
1393
and connect_to == NULL
1394
and not route_added and
1395
((af == AF_INET6 and not
1396
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1398
or (af == AF_INET and
1399
/* Not a a IPv4LL address */
1400
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1401
& 0xFFFF0000L) != 0xA9FE0000L))){
1402
/* Work around Avahi bug - Avahi does not announce link-local
1403
addresses if it has a global address, so local hosts with
1404
*only* a link-local address (e.g. Mandos clients) cannot
1405
connect to a Mandos server announced by Avahi on a server
1406
host with a global address. Work around this by retrying
1407
with an explicit route added with the server's address.
1409
Avahi bug reference:
1410
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1411
https://bugs.debian.org/587961
1414
fprintf_plus(stderr, "Mandos server unreachable, trying"
1418
route_added = add_local_route(ip, if_index);
1424
if(errno != ECONNREFUSED or debug){
1426
perror_plus("connect");
558
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
560
char addrstr[INET6_ADDRSTRLEN] = "";
561
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
562
sizeof(addrstr)) == NULL){
565
if(strcmp(addrstr, ip) != 0){
566
fprintf(stderr, "Canonical address form: %s\n", addrstr);
571
ret = connect(tcp_sd, &to.in, sizeof(to));
1439
577
const char *out = mandos_protocol_version;
1442
580
size_t out_size = strlen(out);
1443
581
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1444
out_size - written));
1447
perror_plus("write");
582
out_size - written));
1449
586
goto mandos_end;
1451
588
written += (size_t)ret;
1452
589
if(written < out_size){
1455
if(out == mandos_protocol_version){
592
if (out == mandos_protocol_version){
1470
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1478
/* This casting via intptr_t is to eliminate warning about casting
1479
an int to a pointer type. This is exactly how the GnuTLS Guile
1480
function "set-session-transport-fd!" does it. */
1481
gnutls_transport_set_ptr(session,
1482
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1490
ret = gnutls_handshake(session);
602
fprintf(stderr, "Establishing TLS session with %s\n", ip);
605
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
608
ret = gnutls_handshake (session);
1495
609
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1497
if(ret != GNUTLS_E_SUCCESS){
611
if (ret != GNUTLS_E_SUCCESS){
1499
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
613
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1503
617
goto mandos_end;
1506
620
/* Read OpenPGP packet that contains the wanted password */
1509
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
623
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
1520
buffer_capacity = incbuffer(&buffer, buffer_length,
1522
if(buffer_capacity == 0){
1524
perror_plus("incbuffer");
628
buffer_capacity = adjustbuffer(&buffer, buffer_length,
630
if (buffer_capacity == 0){
631
perror("adjustbuffer");
1531
633
goto mandos_end;
1534
636
sret = gnutls_record_recv(session, buffer+buffer_length,
1541
643
case GNUTLS_E_INTERRUPTED:
1542
644
case GNUTLS_E_AGAIN:
1544
646
case GNUTLS_E_REHANDSHAKE:
1546
ret = gnutls_handshake(session);
648
ret = gnutls_handshake (session);
1552
649
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1554
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
651
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1558
654
goto mandos_end;
1562
fprintf_plus(stderr, "Unknown error while reading data from"
1563
" encrypted session with Mandos server\n");
1564
gnutls_bye(session, GNUTLS_SHUT_RDWR);
658
fprintf(stderr, "Unknown error while reading data from"
659
" encrypted session with Mandos server\n");
661
gnutls_bye (session, GNUTLS_SHUT_RDWR);
1566
662
goto mandos_end;
1778
803
case AVAHI_BROWSER_ALL_FOR_NOW:
1779
804
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1781
fprintf_plus(stderr, "No Mandos server found, still"
806
fprintf(stderr, "No Mandos server found, still searching...\n");
1788
/* Signal handler that stops main loop after SIGTERM */
1789
static void handle_sigterm(int sig){
1794
signal_received = sig;
1795
int old_errno = errno;
1796
/* set main loop to exit */
1797
if(simple_poll != NULL){
1798
avahi_simple_poll_quit(simple_poll);
1803
__attribute__((nonnull, warn_unused_result))
1804
bool get_flags(const char *ifname, struct ifreq *ifr){
1808
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1811
perror_plus("socket");
1815
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1816
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1817
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1821
perror_plus("ioctl SIOCGIFFLAGS");
1824
if((close(s) == -1) and debug){
1826
perror_plus("close");
1831
if((close(s) == -1) and debug){
1833
perror_plus("close");
1839
__attribute__((nonnull, warn_unused_result))
1840
bool good_flags(const char *ifname, const struct ifreq *ifr){
1842
/* Reject the loopback device */
1843
if(ifr->ifr_flags & IFF_LOOPBACK){
1845
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1850
/* Accept point-to-point devices only if connect_to is specified */
1851
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1853
fprintf_plus(stderr, "Accepting point-to-point interface"
1854
" \"%s\"\n", ifname);
1858
/* Otherwise, reject non-broadcast-capable devices */
1859
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1861
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1862
" \"%s\"\n", ifname);
1866
/* Reject non-ARP interfaces (including dummy interfaces) */
1867
if(ifr->ifr_flags & IFF_NOARP){
1869
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1875
/* Accept this device */
1877
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1883
* This function determines if a directory entry in /sys/class/net
1884
* corresponds to an acceptable network device.
1885
* (This function is passed to scandir(3) as a filter function.)
1887
__attribute__((nonnull, warn_unused_result))
1888
int good_interface(const struct dirent *if_entry){
1889
if(if_entry->d_name[0] == '.'){
1894
if(not get_flags(if_entry->d_name, &ifr)){
1896
fprintf_plus(stderr, "Failed to get flags for interface "
1897
"\"%s\"\n", if_entry->d_name);
1902
if(not good_flags(if_entry->d_name, &ifr)){
1909
* This function determines if a network interface is up.
1911
__attribute__((nonnull, warn_unused_result))
1912
bool interface_is_up(const char *interface){
1914
if(not get_flags(interface, &ifr)){
1916
fprintf_plus(stderr, "Failed to get flags for interface "
1917
"\"%s\"\n", interface);
1922
return (bool)(ifr.ifr_flags & IFF_UP);
1926
* This function determines if a network interface is running
1928
__attribute__((nonnull, warn_unused_result))
1929
bool interface_is_running(const char *interface){
1931
if(not get_flags(interface, &ifr)){
1933
fprintf_plus(stderr, "Failed to get flags for interface "
1934
"\"%s\"\n", interface);
1939
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1942
__attribute__((nonnull, pure, warn_unused_result))
1943
int notdotentries(const struct dirent *direntry){
1944
/* Skip "." and ".." */
1945
if(direntry->d_name[0] == '.'
1946
and (direntry->d_name[1] == '\0'
1947
or (direntry->d_name[1] == '.'
1948
and direntry->d_name[2] == '\0'))){
1954
/* Is this directory entry a runnable program? */
1955
__attribute__((nonnull, warn_unused_result))
1956
int runnable_hook(const struct dirent *direntry){
1961
if((direntry->d_name)[0] == '\0'){
1966
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1967
"abcdefghijklmnopqrstuvwxyz"
1970
if((direntry->d_name)[sret] != '\0'){
1971
/* Contains non-allowed characters */
1973
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1979
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1982
perror_plus("Could not stat hook");
1986
if(not (S_ISREG(st.st_mode))){
1987
/* Not a regular file */
1989
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1994
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1995
/* Not executable */
1997
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
2003
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
2009
__attribute__((nonnull, warn_unused_result))
2010
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2011
mandos_context *mc){
2013
struct timespec now;
2014
struct timespec waited_time;
2015
intmax_t block_time;
2018
if(mc->current_server == NULL){
2020
fprintf_plus(stderr, "Wait until first server is found."
2023
ret = avahi_simple_poll_iterate(s, -1);
2026
fprintf_plus(stderr, "Check current_server if we should run"
2029
/* the current time */
2030
ret = clock_gettime(CLOCK_MONOTONIC, &now);
2032
perror_plus("clock_gettime");
2035
/* Calculating in ms how long time between now and server
2036
who we visted longest time ago. Now - last seen. */
2037
waited_time.tv_sec = (now.tv_sec
2038
- mc->current_server->last_seen.tv_sec);
2039
waited_time.tv_nsec = (now.tv_nsec
2040
- mc->current_server->last_seen.tv_nsec);
2041
/* total time is 10s/10,000ms.
2042
Converting to s from ms by dividing by 1,000,
2043
and ns to ms by dividing by 1,000,000. */
2044
block_time = ((retry_interval
2045
- ((intmax_t)waited_time.tv_sec * 1000))
2046
- ((intmax_t)waited_time.tv_nsec / 1000000));
2049
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2053
if(block_time <= 0){
2054
ret = start_mandos_communication(mc->current_server->ip,
2055
mc->current_server->port,
2056
mc->current_server->if_index,
2057
mc->current_server->af, mc);
2059
avahi_simple_poll_quit(s);
2062
ret = clock_gettime(CLOCK_MONOTONIC,
2063
&mc->current_server->last_seen);
2065
perror_plus("clock_gettime");
2068
mc->current_server = mc->current_server->next;
2069
block_time = 0; /* Call avahi to find new Mandos
2070
servers, but don't block */
2073
ret = avahi_simple_poll_iterate(s, (int)block_time);
2076
if(ret > 0 or errno != EINTR){
2077
return (ret != 1) ? ret : 0;
2083
__attribute__((nonnull))
2084
void run_network_hooks(const char *mode, const char *interface,
2086
struct dirent **direntries = NULL;
2087
if(hookdir_fd == -1){
2088
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2090
if(hookdir_fd == -1){
2091
if(errno == ENOENT){
2093
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2094
" found\n", hookdir);
2097
perror_plus("open");
2102
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2104
perror_plus("open(\"/dev/null\", O_RDONLY)");
2107
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2108
runnable_hook, alphasort);
2110
perror_plus("scandir");
2114
struct dirent *direntry;
2116
for(int i = 0; i < numhooks; i++){
2117
direntry = direntries[i];
2119
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2122
pid_t hook_pid = fork();
2125
/* Raise privileges */
2126
errno = raise_privileges_permanently();
2128
perror_plus("Failed to raise privileges");
2135
perror_plus("setgid");
2138
/* Reset supplementary groups */
2140
ret = setgroups(0, NULL);
2142
perror_plus("setgroups");
2145
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2147
perror_plus("setenv");
2150
ret = setenv("DEVICE", interface, 1);
2152
perror_plus("setenv");
2155
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2157
perror_plus("setenv");
2160
ret = setenv("MODE", mode, 1);
2162
perror_plus("setenv");
2166
ret = asprintf(&delaystring, "%f", (double)delay);
2168
perror_plus("asprintf");
2171
ret = setenv("DELAY", delaystring, 1);
2174
perror_plus("setenv");
2178
if(connect_to != NULL){
2179
ret = setenv("CONNECT", connect_to, 1);
2181
perror_plus("setenv");
2185
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2189
perror_plus("openat");
2190
_exit(EXIT_FAILURE);
2192
if(close(hookdir_fd) == -1){
2193
perror_plus("close");
2194
_exit(EXIT_FAILURE);
2196
ret = dup2(devnull, STDIN_FILENO);
2198
perror_plus("dup2(devnull, STDIN_FILENO)");
2201
ret = close(devnull);
2203
perror_plus("close");
2206
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2208
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2211
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2213
perror_plus("fexecve");
2214
_exit(EXIT_FAILURE);
2218
perror_plus("fork");
2223
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2224
perror_plus("waitpid");
2228
if(WIFEXITED(status)){
2229
if(WEXITSTATUS(status) != 0){
2230
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2231
" with status %d\n", direntry->d_name,
2232
WEXITSTATUS(status));
2236
} else if(WIFSIGNALED(status)){
2237
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2238
" signal %d\n", direntry->d_name,
2243
fprintf_plus(stderr, "Warning: network hook \"%s\""
2244
" crashed\n", direntry->d_name);
2250
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2256
if(close(hookdir_fd) == -1){
2257
perror_plus("close");
2264
__attribute__((nonnull, warn_unused_result))
2265
int bring_up_interface(const char *const interface,
2267
int old_errno = errno;
2269
struct ifreq network;
2270
unsigned int if_index = if_nametoindex(interface);
2272
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2282
if(not interface_is_up(interface)){
2284
int ioctl_errno = 0;
2285
if(not get_flags(interface, &network)){
2287
fprintf_plus(stderr, "Failed to get flags for interface "
2288
"\"%s\"\n", interface);
2292
network.ifr_flags |= IFF_UP; /* set flag */
2294
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2297
perror_plus("socket");
2305
perror_plus("close");
2312
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2316
/* Raise privileges */
2317
ret_errno = raise_privileges();
2320
perror_plus("Failed to raise privileges");
2325
bool restore_loglevel = false;
2327
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2328
messages about the network interface to mess up the prompt */
2329
ret_linux = klogctl(8, NULL, 5);
2330
if(ret_linux == -1){
2331
perror_plus("klogctl");
2333
restore_loglevel = true;
2336
#endif /* __linux__ */
2337
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2338
ioctl_errno = errno;
2340
if(restore_loglevel){
2341
ret_linux = klogctl(7, NULL, 0);
2342
if(ret_linux == -1){
2343
perror_plus("klogctl");
2346
#endif /* __linux__ */
2348
/* If raise_privileges() succeeded above */
2350
/* Lower privileges */
2351
ret_errno = lower_privileges();
2354
perror_plus("Failed to lower privileges");
2358
/* Close the socket */
2361
perror_plus("close");
2364
if(ret_setflags == -1){
2365
errno = ioctl_errno;
2366
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2371
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2375
/* Sleep checking until interface is running.
2376
Check every 0.25s, up to total time of delay */
2377
for(int i = 0; i < delay * 4; i++){
2378
if(interface_is_running(interface)){
2381
struct timespec sleeptime = { .tv_nsec = 250000000 };
2382
ret = nanosleep(&sleeptime, NULL);
2383
if(ret == -1 and errno != EINTR){
2384
perror_plus("nanosleep");
2392
__attribute__((nonnull, warn_unused_result))
2393
int take_down_interface(const char *const interface){
2394
int old_errno = errno;
2395
struct ifreq network;
2396
unsigned int if_index = if_nametoindex(interface);
2398
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2402
if(interface_is_up(interface)){
2404
int ioctl_errno = 0;
2405
if(not get_flags(interface, &network) and debug){
2407
fprintf_plus(stderr, "Failed to get flags for interface "
2408
"\"%s\"\n", interface);
2412
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2414
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2417
perror_plus("socket");
2423
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2427
/* Raise privileges */
2428
ret_errno = raise_privileges();
2431
perror_plus("Failed to raise privileges");
2434
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2435
ioctl_errno = errno;
2437
/* If raise_privileges() succeeded above */
2439
/* Lower privileges */
2440
ret_errno = lower_privileges();
2443
perror_plus("Failed to lower privileges");
2447
/* Close the socket */
2448
int ret = close(sd);
2450
perror_plus("close");
2453
if(ret_setflags == -1){
2454
errno = ioctl_errno;
2455
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2460
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2468
812
int main(int argc, char *argv[]){
2469
mandos_context mc = { .server = NULL, .dh_bits = 0,
2470
#if GNUTLS_VERSION_NUMBER >= 0x030606
2471
.priority = "SECURE128:!CTYPE-X.509"
2472
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2474
#elif GNUTLS_VERSION_NUMBER < 0x030600
2475
.priority = "SECURE256:!CTYPE-X.509"
2476
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2478
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2480
.current_server = NULL, .interfaces = NULL,
2481
.interfaces_size = 0 };
2482
AvahiSServiceBrowser *sb = NULL;
2487
int exitcode = EXIT_SUCCESS;
2488
char *interfaces_to_take_down = NULL;
2489
size_t interfaces_to_take_down_size = 0;
2490
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2491
char old_tempdir[] = "/tmp/mandosXXXXXX";
2492
char *tempdir = NULL;
2493
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2494
const char *seckey = PATHDIR "/" SECKEY;
2495
const char *pubkey = PATHDIR "/" PUBKEY;
2496
#if GNUTLS_VERSION_NUMBER >= 0x030606
2497
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2498
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2500
const char *dh_params_file = NULL;
2501
char *interfaces_hooks = NULL;
2503
bool gnutls_initialized = false;
2504
bool gpgme_initialized = false;
2506
double retry_interval = 10; /* 10s between trying a server and
2507
retrying the same server again */
2509
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2510
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2515
/* Lower any group privileges we might have, just to be safe */
2519
perror_plus("setgid");
2522
/* Lower user privileges (temporarily) */
2526
perror_plus("seteuid");
2534
struct argp_option options[] = {
2535
{ .name = "debug", .key = 128,
2536
.doc = "Debug mode", .group = 3 },
2537
{ .name = "connect", .key = 'c',
2538
.arg = "ADDRESS:PORT",
2539
.doc = "Connect directly to a specific Mandos server",
2541
{ .name = "interface", .key = 'i',
2543
.doc = "Network interface that will be used to search for"
2546
{ .name = "seckey", .key = 's',
2548
.doc = "OpenPGP secret key file base name",
2550
{ .name = "pubkey", .key = 'p',
2552
.doc = "OpenPGP public key file base name",
2554
{ .name = "tls-privkey", .key = 't',
2556
#if GNUTLS_VERSION_NUMBER >= 0x030606
2557
.doc = "TLS private key file base name",
2559
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2562
{ .name = "tls-pubkey", .key = 'T',
2564
#if GNUTLS_VERSION_NUMBER >= 0x030606
2565
.doc = "TLS public key file base name",
2567
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2570
{ .name = "dh-bits", .key = 129,
2572
.doc = "Bit length of the prime number used in the"
2573
" Diffie-Hellman key exchange",
2575
{ .name = "dh-params", .key = 134,
2577
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2578
" for the Diffie-Hellman key exchange",
2580
{ .name = "priority", .key = 130,
2582
.doc = "GnuTLS priority string for the TLS handshake",
2584
{ .name = "delay", .key = 131,
2586
.doc = "Maximum delay to wait for interface startup",
2588
{ .name = "retry", .key = 132,
2590
.doc = "Retry interval used when denied by the Mandos server",
2592
{ .name = "network-hook-dir", .key = 133,
2594
.doc = "Directory where network hooks are located",
2597
* These reproduce what we would get without ARGP_NO_HELP
2599
{ .name = "help", .key = '?',
2600
.doc = "Give this help list", .group = -1 },
2601
{ .name = "usage", .key = -3,
2602
.doc = "Give a short usage message", .group = -1 },
2603
{ .name = "version", .key = 'V',
2604
.doc = "Print program version", .group = -1 },
2608
error_t parse_opt(int key, char *arg,
2609
struct argp_state *state){
2612
case 128: /* --debug */
2615
case 'c': /* --connect */
2618
case 'i': /* --interface */
2619
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2622
argp_error(state, "%s", strerror(ret_errno));
2625
case 's': /* --seckey */
2628
case 'p': /* --pubkey */
2631
case 't': /* --tls-privkey */
2632
#if GNUTLS_VERSION_NUMBER >= 0x030606
2636
case 'T': /* --tls-pubkey */
2637
#if GNUTLS_VERSION_NUMBER >= 0x030606
2641
case 129: /* --dh-bits */
2643
tmpmax = strtoimax(arg, &tmp, 10);
2644
if(errno != 0 or tmp == arg or *tmp != '\0'
2645
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2646
argp_error(state, "Bad number of DH bits");
2648
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2650
case 134: /* --dh-params */
2651
dh_params_file = arg;
2653
case 130: /* --priority */
2656
case 131: /* --delay */
2658
delay = strtof(arg, &tmp);
2659
if(errno != 0 or tmp == arg or *tmp != '\0'){
2660
argp_error(state, "Bad delay");
2662
case 132: /* --retry */
2664
retry_interval = strtod(arg, &tmp);
2665
if(errno != 0 or tmp == arg or *tmp != '\0'
2666
or (retry_interval * 1000) > INT_MAX
2667
or retry_interval < 0){
2668
argp_error(state, "Bad retry interval");
2671
case 133: /* --network-hook-dir */
2675
* These reproduce what we would get without ARGP_NO_HELP
2677
case '?': /* --help */
2678
argp_state_help(state, state->out_stream,
2679
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2680
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2681
__builtin_unreachable();
2682
case -3: /* --usage */
2683
argp_state_help(state, state->out_stream,
2684
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2685
__builtin_unreachable();
2686
case 'V': /* --version */
2687
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2688
exit(argp_err_exit_status);
2691
return ARGP_ERR_UNKNOWN;
2696
struct argp argp = { .options = options, .parser = parse_opt,
2698
.doc = "Mandos client -- Get and decrypt"
2699
" passwords from a Mandos server" };
2700
ret_errno = argp_parse(&argp, argc, argv,
2701
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2708
perror_plus("argp_parse");
2709
exitcode = EX_OSERR;
2712
exitcode = EX_USAGE;
2718
/* Work around Debian bug #633582:
2719
<https://bugs.debian.org/633582> */
2721
/* Re-raise privileges */
2722
ret = raise_privileges();
2725
perror_plus("Failed to raise privileges");
2729
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2730
int seckey_fd = open(seckey, O_RDONLY);
2731
if(seckey_fd == -1){
2732
perror_plus("open");
2734
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2736
perror_plus("fstat");
2738
if(S_ISREG(st.st_mode)
2739
and st.st_uid == 0 and st.st_gid == 0){
2740
ret = fchown(seckey_fd, uid, gid);
2742
perror_plus("fchown");
2750
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2751
int pubkey_fd = open(pubkey, O_RDONLY);
2752
if(pubkey_fd == -1){
2753
perror_plus("open");
2755
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2757
perror_plus("fstat");
2759
if(S_ISREG(st.st_mode)
2760
and st.st_uid == 0 and st.st_gid == 0){
2761
ret = fchown(pubkey_fd, uid, gid);
2763
perror_plus("fchown");
2771
if(dh_params_file != NULL
2772
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2773
int dhparams_fd = open(dh_params_file, O_RDONLY);
2774
if(dhparams_fd == -1){
2775
perror_plus("open");
2777
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2779
perror_plus("fstat");
2781
if(S_ISREG(st.st_mode)
2782
and st.st_uid == 0 and st.st_gid == 0){
2783
ret = fchown(dhparams_fd, uid, gid);
2785
perror_plus("fchown");
2793
/* Lower privileges */
2794
ret = lower_privileges();
2797
perror_plus("Failed to lower privileges");
2802
/* Remove invalid interface names (except "none") */
2804
char *interface = NULL;
2805
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2807
if(strcmp(interface, "none") != 0
2808
and if_nametoindex(interface) == 0){
2809
if(interface[0] != '\0'){
2810
fprintf_plus(stderr, "Not using nonexisting interface"
2811
" \"%s\"\n", interface);
2813
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2819
/* Run network hooks */
2821
if(mc.interfaces != NULL){
2822
interfaces_hooks = malloc(mc.interfaces_size);
2823
if(interfaces_hooks == NULL){
2824
perror_plus("malloc");
2827
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2828
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2830
run_network_hooks("start", interfaces_hooks != NULL ?
2831
interfaces_hooks : "", delay);
2835
avahi_set_log_function(empty_log);
2838
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2839
from the signal handler */
2840
/* Initialize the pseudo-RNG for Avahi */
2841
srand((unsigned int) time(NULL));
2842
simple_poll = avahi_simple_poll_new();
2843
if(simple_poll == NULL){
2844
fprintf_plus(stderr,
2845
"Avahi: Failed to create simple poll object.\n");
2846
exitcode = EX_UNAVAILABLE;
2850
sigemptyset(&sigterm_action.sa_mask);
2851
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2853
perror_plus("sigaddset");
2854
exitcode = EX_OSERR;
2857
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2859
perror_plus("sigaddset");
2860
exitcode = EX_OSERR;
2863
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2865
perror_plus("sigaddset");
2866
exitcode = EX_OSERR;
2869
/* Need to check if the handler is SIG_IGN before handling:
2870
| [[info:libc:Initial Signal Actions]] |
2871
| [[info:libc:Basic Signal Handling]] |
2873
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2875
perror_plus("sigaction");
2878
if(old_sigterm_action.sa_handler != SIG_IGN){
2879
ret = sigaction(SIGINT, &sigterm_action, NULL);
2881
perror_plus("sigaction");
2882
exitcode = EX_OSERR;
2886
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2888
perror_plus("sigaction");
2891
if(old_sigterm_action.sa_handler != SIG_IGN){
2892
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2894
perror_plus("sigaction");
2895
exitcode = EX_OSERR;
2899
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2901
perror_plus("sigaction");
2904
if(old_sigterm_action.sa_handler != SIG_IGN){
2905
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2907
perror_plus("sigaction");
2908
exitcode = EX_OSERR;
2913
/* If no interfaces were specified, make a list */
2914
if(mc.interfaces == NULL){
2915
struct dirent **direntries = NULL;
2916
/* Look for any good interfaces */
2917
ret = scandir(sys_class_net, &direntries, good_interface,
2920
/* Add all found interfaces to interfaces list */
2921
for(int i = 0; i < ret; ++i){
2922
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2923
direntries[i]->d_name);
2926
perror_plus("argz_add");
2927
free(direntries[i]);
2931
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2932
direntries[i]->d_name);
2934
free(direntries[i]);
2941
fprintf_plus(stderr, "Could not find a network interface\n");
2942
exitcode = EXIT_FAILURE;
2947
/* Bring up interfaces which are down, and remove any "none"s */
2949
char *interface = NULL;
2950
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2952
/* If interface name is "none", stop bringing up interfaces.
2953
Also remove all instances of "none" from the list */
2954
if(strcmp(interface, "none") == 0){
2955
argz_delete(&mc.interfaces, &mc.interfaces_size,
2958
while((interface = argz_next(mc.interfaces,
2959
mc.interfaces_size, interface))){
2960
if(strcmp(interface, "none") == 0){
2961
argz_delete(&mc.interfaces, &mc.interfaces_size,
2968
bool interface_was_up = interface_is_up(interface);
2969
errno = bring_up_interface(interface, delay);
2970
if(not interface_was_up){
2972
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2973
" %s\n", interface, strerror(errno));
2975
errno = argz_add(&interfaces_to_take_down,
2976
&interfaces_to_take_down_size,
2979
perror_plus("argz_add");
2984
if(debug and (interfaces_to_take_down == NULL)){
2985
fprintf_plus(stderr, "No interfaces were brought up\n");
2989
/* If we only got one interface, explicitly use only that one */
2990
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2992
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2995
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
3002
#if GNUTLS_VERSION_NUMBER >= 0x030606
3003
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3004
#elif GNUTLS_VERSION_NUMBER < 0x030600
3005
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3007
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3010
fprintf_plus(stderr, "init_gnutls_global failed\n");
3011
exitcode = EX_UNAVAILABLE;
3014
gnutls_initialized = true;
3021
/* Try /run/tmp before /tmp */
3022
tempdir = mkdtemp(run_tempdir);
3023
if(tempdir == NULL and errno == ENOENT){
3025
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
3026
run_tempdir, old_tempdir);
3028
tempdir = mkdtemp(old_tempdir);
3030
if(tempdir == NULL){
3031
perror_plus("mkdtemp");
3039
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
3040
fprintf_plus(stderr, "init_gpgme failed\n");
3041
exitcode = EX_UNAVAILABLE;
3044
gpgme_initialized = true;
3051
if(connect_to != NULL){
3052
/* Connect directly, do not use Zeroconf */
3053
/* (Mainly meant for debugging) */
3054
char *address = strrchr(connect_to, ':');
3056
if(address == NULL){
3057
fprintf_plus(stderr, "No colon in address\n");
3058
exitcode = EX_USAGE;
3068
tmpmax = strtoimax(address+1, &tmp, 10);
3069
if(errno != 0 or tmp == address+1 or *tmp != '\0'
3070
or tmpmax != (in_port_t)tmpmax){
3071
fprintf_plus(stderr, "Bad port number\n");
3072
exitcode = EX_USAGE;
3080
port = (in_port_t)tmpmax;
3082
/* Colon in address indicates IPv6 */
3084
if(strchr(connect_to, ':') != NULL){
3086
/* Accept [] around IPv6 address - see RFC 5952 */
3087
if(connect_to[0] == '[' and address[-1] == ']')
3095
address = connect_to;
3101
while(not quit_now){
3102
ret = start_mandos_communication(address, port, if_index, af,
3104
if(quit_now or ret == 0){
3108
fprintf_plus(stderr, "Retrying in %d seconds\n",
3109
(int)retry_interval);
3111
sleep((unsigned int)retry_interval);
3115
exitcode = EXIT_SUCCESS;
3126
AvahiServerConfig config;
3127
/* Do not publish any local Zeroconf records */
3128
avahi_server_config_init(&config);
3129
config.publish_hinfo = 0;
3130
config.publish_addresses = 0;
3131
config.publish_workstation = 0;
3132
config.publish_domain = 0;
3134
/* Allocate a new server */
3135
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3136
&config, NULL, NULL, &ret);
3138
/* Free the Avahi configuration data */
3139
avahi_server_config_free(&config);
3142
/* Check if creating the Avahi server object succeeded */
3143
if(mc.server == NULL){
3144
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3145
avahi_strerror(ret));
3146
exitcode = EX_UNAVAILABLE;
3154
/* Create the Avahi service browser */
3155
sb = avahi_s_service_browser_new(mc.server, if_index,
3156
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
3157
NULL, 0, browse_callback,
3160
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3161
avahi_strerror(avahi_server_errno(mc.server)));
3162
exitcode = EX_UNAVAILABLE;
3170
/* Run the main loop */
3173
fprintf_plus(stderr, "Starting Avahi loop search\n");
3176
ret = avahi_loop_with_timeout(simple_poll,
3177
(int)(retry_interval * 1000), &mc);
3179
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3180
(ret == 0) ? "successfully" : "with error");
813
AvahiSServiceBrowser *sb = NULL;
816
int exitcode = EXIT_SUCCESS;
817
const char *interface = "eth0";
818
struct ifreq network;
822
char *connect_to = NULL;
823
char tempdir[] = "/tmp/mandosXXXXXX";
824
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
825
const char *seckey = PATHDIR "/" SECKEY;
826
const char *pubkey = PATHDIR "/" PUBKEY;
828
mandos_context mc = { .simple_poll = NULL, .server = NULL,
829
.dh_bits = 1024, .priority = "SECURE256"
830
":!CTYPE-X.509:+CTYPE-OPENPGP" };
831
bool gnutls_initalized = false;
832
bool gpgme_initalized = false;
835
struct argp_option options[] = {
836
{ .name = "debug", .key = 128,
837
.doc = "Debug mode", .group = 3 },
838
{ .name = "connect", .key = 'c',
839
.arg = "ADDRESS:PORT",
840
.doc = "Connect directly to a specific Mandos server",
842
{ .name = "interface", .key = 'i',
844
.doc = "Interface that will be used to search for Mandos"
847
{ .name = "seckey", .key = 's',
849
.doc = "OpenPGP secret key file base name",
851
{ .name = "pubkey", .key = 'p',
853
.doc = "OpenPGP public key file base name",
855
{ .name = "dh-bits", .key = 129,
857
.doc = "Bit length of the prime number used in the"
858
" Diffie-Hellman key exchange",
860
{ .name = "priority", .key = 130,
862
.doc = "GnuTLS priority string for the TLS handshake",
867
error_t parse_opt (int key, char *arg,
868
struct argp_state *state) {
870
case 128: /* --debug */
873
case 'c': /* --connect */
876
case 'i': /* --interface */
879
case 's': /* --seckey */
882
case 'p': /* --pubkey */
885
case 129: /* --dh-bits */
886
ret = sscanf(arg, "%u", &mc.dh_bits);
887
if(ret == 0 or mc.dh_bits == 0){
888
fprintf(stderr, "Bad number of DH bits\n");
892
case 130: /* --priority */
900
return ARGP_ERR_UNKNOWN;
905
struct argp argp = { .options = options, .parser = parse_opt,
907
.doc = "Mandos client -- Get and decrypt"
908
" passwords from a Mandos server" };
909
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
910
if (ret == ARGP_ERR_UNKNOWN){
911
fprintf(stderr, "Unknown error while parsing arguments\n");
912
exitcode = EXIT_FAILURE;
917
/* If the interface is down, bring it up */
919
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
922
exitcode = EXIT_FAILURE;
925
strcpy(network.ifr_name, interface);
926
ret = ioctl(sd, SIOCGIFFLAGS, &network);
928
perror("ioctl SIOCGIFFLAGS");
929
exitcode = EXIT_FAILURE;
932
if((network.ifr_flags & IFF_UP) == 0){
933
network.ifr_flags |= IFF_UP;
934
ret = ioctl(sd, SIOCSIFFLAGS, &network);
936
perror("ioctl SIOCSIFFLAGS");
937
exitcode = EXIT_FAILURE;
941
ret = (int)TEMP_FAILURE_RETRY(close(sd));
960
ret = init_gnutls_global(&mc, pubkey, seckey);
962
fprintf(stderr, "init_gnutls_global failed\n");
963
exitcode = EXIT_FAILURE;
966
gnutls_initalized = true;
969
if(mkdtemp(tempdir) == NULL){
975
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
976
fprintf(stderr, "gpgme_initalized failed\n");
977
exitcode = EXIT_FAILURE;
980
gpgme_initalized = true;
983
if_index = (AvahiIfIndex) if_nametoindex(interface);
985
fprintf(stderr, "No such interface: \"%s\"\n", interface);
989
if(connect_to != NULL){
990
/* Connect directly, do not use Zeroconf */
991
/* (Mainly meant for debugging) */
992
char *address = strrchr(connect_to, ':');
994
fprintf(stderr, "No colon in address\n");
995
exitcode = EXIT_FAILURE;
999
ret = sscanf(address+1, "%" SCNu16, &port);
1000
if(ret == 0 or port == 0){
1001
fprintf(stderr, "Bad port number\n");
1002
exitcode = EXIT_FAILURE;
1006
address = connect_to;
1007
ret = start_mandos_communication(address, port, if_index, &mc);
1009
exitcode = EXIT_FAILURE;
1011
exitcode = EXIT_SUCCESS;
1017
avahi_set_log_function(empty_log);
1020
/* Initialize the pseudo-RNG for Avahi */
1021
srand((unsigned int) time(NULL));
1023
/* Allocate main Avahi loop object */
1024
mc.simple_poll = avahi_simple_poll_new();
1025
if (mc.simple_poll == NULL) {
1026
fprintf(stderr, "Avahi: Failed to create simple poll"
1028
exitcode = EXIT_FAILURE;
1033
AvahiServerConfig config;
1034
/* Do not publish any local Zeroconf records */
1035
avahi_server_config_init(&config);
1036
config.publish_hinfo = 0;
1037
config.publish_addresses = 0;
1038
config.publish_workstation = 0;
1039
config.publish_domain = 0;
1041
/* Allocate a new server */
1042
mc.server = avahi_server_new(avahi_simple_poll_get
1043
(mc.simple_poll), &config, NULL,
1046
/* Free the Avahi configuration data */
1047
avahi_server_config_free(&config);
1050
/* Check if creating the Avahi server object succeeded */
1051
if (mc.server == NULL) {
1052
fprintf(stderr, "Failed to create Avahi server: %s\n",
1053
avahi_strerror(error));
1054
exitcode = EXIT_FAILURE;
1058
/* Create the Avahi service browser */
1059
sb = avahi_s_service_browser_new(mc.server, if_index,
1061
"_mandos._tcp", NULL, 0,
1062
browse_callback, &mc);
1064
fprintf(stderr, "Failed to create service browser: %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
exitcode = EXIT_FAILURE;
1070
/* Run the main loop */
1073
fprintf(stderr, "Starting Avahi loop search\n");
1076
avahi_simple_poll_loop(mc.simple_poll);
3186
if(signal_received){
3187
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3188
argv[0], signal_received,
3189
strsignal(signal_received));
3191
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3195
/* Cleanup things */
3196
free(mc.interfaces);
3199
avahi_s_service_browser_free(sb);
3201
if(mc.server != NULL)
3202
avahi_server_free(mc.server);
3204
if(simple_poll != NULL)
3205
avahi_simple_poll_free(simple_poll);
3207
if(gnutls_initialized){
3208
gnutls_certificate_free_credentials(mc.cred);
3209
gnutls_dh_params_deinit(mc.dh_params);
3212
if(gpgme_initialized){
3213
gpgme_release(mc.ctx);
3216
/* Cleans up the circular linked list of Mandos servers the client
3218
if(mc.current_server != NULL){
3219
mc.current_server->prev->next = NULL;
3220
while(mc.current_server != NULL){
3221
server *next = mc.current_server->next;
3223
#pragma GCC diagnostic push
3224
#pragma GCC diagnostic ignored "-Wcast-qual"
3226
free((char *)(mc.current_server->ip));
3228
#pragma GCC diagnostic pop
3230
free(mc.current_server);
3231
mc.current_server = next;
3235
/* Re-raise privileges */
3237
ret = raise_privileges();
3240
perror_plus("Failed to raise privileges");
3243
/* Run network hooks */
3244
run_network_hooks("stop", interfaces_hooks != NULL ?
3245
interfaces_hooks : "", delay);
3247
/* Take down the network interfaces which were brought up */
3249
char *interface = NULL;
3250
while((interface = argz_next(interfaces_to_take_down,
3251
interfaces_to_take_down_size,
3253
ret = take_down_interface(interface);
3256
perror_plus("Failed to take down interface");
3259
if(debug and (interfaces_to_take_down == NULL)){
3260
fprintf_plus(stderr, "No interfaces needed to be taken"
3266
ret = lower_privileges_permanently();
3269
perror_plus("Failed to lower privileges permanently");
3273
free(interfaces_to_take_down);
3274
free(interfaces_hooks);
3276
void clean_dir_at(int base, const char * const dirname,
3278
struct dirent **direntries = NULL;
3280
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3286
perror_plus("open");
3289
int numentries = scandirat(dir_fd, ".", &direntries,
3290
notdotentries, alphasort);
3291
if(numentries >= 0){
3292
for(int i = 0; i < numentries; i++){
3294
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3295
dirname, direntries[i]->d_name);
3297
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3299
if(errno == EISDIR){
3300
dret = unlinkat(dir_fd, direntries[i]->d_name,
3303
if((dret == -1) and (errno == ENOTEMPTY)
3304
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3305
== 0) and (level == 0)){
3306
/* Recurse only in this special case */
3307
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3310
if((dret == -1) and (errno != ENOENT)){
3311
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3312
direntries[i]->d_name, strerror(errno));
3315
free(direntries[i]);
3318
/* need to clean even if 0 because man page doesn't specify */
3320
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3321
if(dret == -1 and errno != ENOENT){
3322
perror_plus("rmdir");
3325
perror_plus("scandirat");
3330
/* Removes the GPGME temp directory and all files inside */
3331
if(tempdir != NULL){
3332
clean_dir_at(-1, tempdir, 0);
3336
sigemptyset(&old_sigterm_action.sa_mask);
3337
old_sigterm_action.sa_handler = SIG_DFL;
3338
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3339
&old_sigterm_action,
3342
perror_plus("sigaction");
3345
ret = raise(signal_received);
3346
} while(ret != 0 and errno == EINTR);
3348
perror_plus("raise");
3351
TEMP_FAILURE_RETRY(pause());
1081
fprintf(stderr, "%s exiting\n", argv[0]);
1084
/* Cleanup things */
1086
avahi_s_service_browser_free(sb);
1088
if (mc.server != NULL)
1089
avahi_server_free(mc.server);
1091
if (mc.simple_poll != NULL)
1092
avahi_simple_poll_free(mc.simple_poll);
1094
if (gnutls_initalized){
1095
gnutls_certificate_free_credentials(mc.cred);
1096
gnutls_global_deinit ();
1097
gnutls_dh_params_deinit(mc.dh_params);
1100
if(gpgme_initalized){
1101
gpgme_release(mc.ctx);
1104
/* Removes the temp directory used by GPGME */
1105
if(tempdir[0] != '\0'){
1107
struct dirent *direntry;
1108
d = opendir(tempdir);
1110
if(errno != ENOENT){
1115
direntry = readdir(d);
1116
if(direntry == NULL){
1119
if (direntry->d_type == DT_REG){
1120
char *fullname = NULL;
1121
ret = asprintf(&fullname, "%s/%s", tempdir,
1127
ret = unlink(fullname);
1129
fprintf(stderr, "unlink(\"%s\"): %s",
1130
fullname, strerror(errno));
1137
ret = rmdir(tempdir);
1138
if(ret == -1 and errno != ENOENT){