131
99
#define BUFFER_SIZE 256
133
#define PATHDIR "/conf/conf.d/mandos"
134
#define SECKEY "seckey.txt"
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
138
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
139
103
static const char mandos_protocol_version[] = "1";
140
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
153
AvahiIfIndex if_index;
155
struct timespec last_seen;
104
const char *argp_program_version = "password-request 1.0";
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
160
107
/* Used for passing in values through the Avahi callback functions */
109
AvahiSimplePoll *simple_poll;
162
110
AvahiServer *server;
163
111
gnutls_certificate_credentials_t cred;
164
112
unsigned int dh_bits;
165
113
gnutls_dh_params_t dh_params;
166
114
const char *priority;
168
server *current_server;
170
size_t interfaces_size;
171
115
} mandos_context;
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
176
sig_atomic_t quit_now = 0;
177
int signal_received = 0;
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
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));
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* bytes. "buffer_capacity" is how much is currently allocated,
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
201
120
* "buffer_length" is how much is already used.
203
__attribute__((nonnull, warn_unused_result))
204
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
209
int old_errno = errno;
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
216
129
buffer_capacity += BUFFER_SIZE;
218
131
return buffer_capacity;
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){
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
231
*new_server = (server){ .ip = strdup(ip),
233
.if_index = if_index,
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
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){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
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,
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
277
144
gpgme_error_t rc;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
278
148
gpgme_engine_info_t engine_info;
281
* Helper function to insert pub and seckey to the engine keyring.
283
bool import_key(const char * const filename){
286
gpgme_data_t pgp_data;
288
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
301
rc = gpgme_op_import(mc->ctx, pgp_data);
302
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
310
perror_plus("close");
312
gpgme_data_release(pgp_data);
317
fprintf_plus(stderr, "Initializing GPGME\n");
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
321
155
gpgme_check_version(NULL);
322
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
157
if (rc != GPG_ERR_NO_ERROR){
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
gpgme_strsource(rc), gpgme_strerror(rc));
329
163
/* Set GPGME home directory for the OpenPGP engine only */
330
rc = gpgme_get_engine_info(&engine_info);
331
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
gpgme_strsource(rc), gpgme_strerror(rc));
336
170
while(engine_info != NULL){
337
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
338
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
339
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
342
176
engine_info = engine_info->next;
344
178
if(engine_info == NULL){
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
350
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
352
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
359
if(not import_key(pubkey) or not import_key(seckey)){
367
* Decrypt OpenPGP data.
368
* Returns -1 on error
370
__attribute__((nonnull, warn_unused_result))
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
375
gpgme_data_t dh_crypto, dh_plain;
378
size_t plaintext_capacity = 0;
379
ssize_t plaintext_length = 0;
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
385
183
/* Create new GPGME data buffer from memory cryptotext */
386
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
388
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
186
if (rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
394
192
/* Create new empty GPGME data buffer for the plaintext */
395
193
rc = gpgme_data_new(&dh_plain);
396
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
gpgme_strsource(rc), gpgme_strerror(rc));
400
197
gpgme_data_release(dh_crypto);
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
404
210
/* Decrypt data from the cryptotext data buffer to the plaintext
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
407
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
gpgme_strsource(rc), gpgme_strerror(rc));
410
216
plaintext_length = -1;
412
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
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);
421
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
424
gpgme_recipient_t recipient;
425
recipient = result->recipients;
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
225
gpgme_decrypt_result_t result;
226
result = gpgme_op_decrypt_result(ctx);
228
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
230
fprintf(stderr, "Unsupported algorithm: %s\n",
231
result->unsupported_algorithm);
232
fprintf(stderr, "Wrong key usage: %u\n",
233
result->wrong_key_usage);
234
if(result->file_name != NULL){
235
fprintf(stderr, "File name: %s\n", result->file_name);
237
gpgme_recipient_t recipient;
238
recipient = result->recipients;
426
240
while(recipient != NULL){
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
241
fprintf(stderr, "Public key algorithm: %s\n",
242
gpgme_pubkey_algo_name(recipient->pubkey_algo));
243
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
244
fprintf(stderr, "Secret key available: %s\n",
245
recipient->status == GPG_ERR_NO_SECKEY
434
247
recipient = recipient->next;
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
445
253
/* Seek back to the beginning of the GPGME plaintext data buffer */
446
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
447
perror_plus("gpgme_data_seek");
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
448
256
plaintext_length = -1;
449
257
goto decrypt_end;
452
260
*plaintext = NULL;
454
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
457
if(plaintext_capacity == 0){
458
perror_plus("incbuffer");
459
plaintext_length = -1;
262
plaintext_capacity = adjustbuffer(plaintext,
263
(size_t)plaintext_length,
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
267
plaintext_length = -1;
463
271
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
465
273
/* Print the data, if any */
471
perror_plus("gpgme_data_read");
279
perror("gpgme_data_read");
472
280
plaintext_length = -1;
473
281
goto decrypt_end;
475
283
plaintext_length += ret;
479
fprintf_plus(stderr, "Decrypted password is: ");
287
fprintf(stderr, "Decrypted password is: ");
480
288
for(ssize_t i = 0; i < plaintext_length; i++){
481
289
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
543
341
/* OpenPGP credentials */
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
545
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
safer_gnutls_strerror(ret));
548
gnutls_global_deinit();
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
346
safer_gnutls_strerror(ret));
347
gnutls_global_deinit ();
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
352
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
353
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
559
357
ret = gnutls_certificate_set_openpgp_key_file
560
358
(mc->cred, pubkeyfilename, seckeyfilename,
561
359
GNUTLS_OPENPGP_FMT_BASE64);
562
if(ret != GNUTLS_E_SUCCESS){
564
"Error[%d] while reading the OpenPGP key pair ('%s',"
565
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
566
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
567
safer_gnutls_strerror(ret));
360
if (ret != GNUTLS_E_SUCCESS) {
362
"Error[%d] while reading the OpenPGP key pair ('%s',"
363
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
364
fprintf(stdout, "The GnuTLS error is: %s\n",
365
safer_gnutls_strerror(ret));
571
369
/* GnuTLS server initialization */
572
370
ret = gnutls_dh_params_init(&mc->dh_params);
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
" initialization: %s\n",
576
safer_gnutls_strerror(ret));
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
586
dhparamsfilename = NULL;
589
size_t params_capacity = 0;
591
params_capacity = incbuffer((char **)¶ms.data,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
598
dhparamsfilename = NULL;
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
608
/* check bytes_read for failure */
613
dhparamsfilename = NULL;
616
params.size += (unsigned int)bytes_read;
618
if(params.data == NULL){
619
dhparamsfilename = NULL;
621
if(dhparamsfilename == NULL){
624
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
625
GNUTLS_X509_FMT_PEM);
626
if(ret != GNUTLS_E_SUCCESS){
627
fprintf_plus(stderr, "Failed to parse DH parameters in file"
628
" \"%s\": %s\n", dhparamsfilename,
629
safer_gnutls_strerror(ret));
630
dhparamsfilename = NULL;
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
640
int secfile = open(seckeyfilename, O_RDONLY);
645
size_t buffer_capacity = 0;
647
buffer_capacity = incbuffer((char **)&buffer.data,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
663
/* check bytes_read for failure */
670
buffer.size += (unsigned int)bytes_read;
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
683
safer_gnutls_strerror(ret));
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
697
/* Use private key to suggest an appropriate
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
714
fprintf_plus(stderr, "Falling back to security parameter"
716
safe_string(gnutls_sec_param_get_name
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
736
safer_gnutls_strerror(ret));
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
371
if (ret != GNUTLS_E_SUCCESS) {
372
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
373
" %s\n", safer_gnutls_strerror(ret));
376
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
377
if (ret != GNUTLS_E_SUCCESS) {
378
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
379
safer_gnutls_strerror(ret));
751
383
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
757
389
gnutls_certificate_free_credentials(mc->cred);
758
390
gnutls_global_deinit();
759
gnutls_dh_params_deinit(mc->dh_params);
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
395
static int init_gnutls_session(mandos_context *mc,
396
gnutls_session_t *session){
767
398
/* GnuTLS session creation */
769
ret = gnutls_init(session, GNUTLS_SERVER);
773
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
774
if(ret != GNUTLS_E_SUCCESS){
776
"Error in GnuTLS session initialization: %s\n",
777
safer_gnutls_strerror(ret));
399
ret = gnutls_init(session, GNUTLS_SERVER);
400
if (ret != GNUTLS_E_SUCCESS){
401
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
402
safer_gnutls_strerror(ret));
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
785
gnutls_deinit(*session);
788
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
789
if(ret != GNUTLS_E_SUCCESS){
790
fprintf_plus(stderr, "Syntax error at: %s\n", err);
791
fprintf_plus(stderr, "GnuTLS error: %s\n",
792
safer_gnutls_strerror(ret));
793
gnutls_deinit(*session);
407
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
408
if (ret != GNUTLS_E_SUCCESS) {
409
fprintf(stderr, "Syntax error at: %s\n", err);
410
fprintf(stderr, "GnuTLS error: %s\n",
411
safer_gnutls_strerror(ret));
412
gnutls_deinit (*session);
799
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
802
gnutls_deinit(*session);
805
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
806
if(ret != GNUTLS_E_SUCCESS){
807
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
808
safer_gnutls_strerror(ret));
809
gnutls_deinit(*session);
417
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
419
if (ret != GNUTLS_E_SUCCESS) {
420
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
421
safer_gnutls_strerror(ret));
422
gnutls_deinit (*session);
813
426
/* ignore client certificate if any. */
814
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
427
gnutls_certificate_server_set_request (*session,
430
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
820
436
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
821
437
__attribute__((unused)) const char *txt){}
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
875
/* Helper function to add_local_route() and delete_local_route() */
876
__attribute__((nonnull, warn_unused_result))
877
static bool add_delete_local_route(const bool add,
879
AvahiIfIndex if_index){
881
char helper[] = "mandos-client-iprouteadddel";
882
char add_arg[] = "add";
883
char delete_arg[] = "delete";
884
char debug_flag[] = "--debug";
885
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
886
if(pluginhelperdir == NULL){
888
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
889
" variable not set; cannot run helper\n");
894
char interface[IF_NAMESIZE];
895
if(if_indextoname((unsigned int)if_index, interface) == NULL){
896
perror_plus("if_indextoname");
900
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
902
perror_plus("open(\"/dev/null\", O_RDONLY)");
908
/* Raise privileges */
909
errno = raise_privileges_permanently();
911
perror_plus("Failed to raise privileges");
912
/* _exit(EX_NOPERM); */
918
perror_plus("setgid");
921
/* Reset supplementary groups */
923
ret = setgroups(0, NULL);
925
perror_plus("setgroups");
929
ret = dup2(devnull, STDIN_FILENO);
931
perror_plus("dup2(devnull, STDIN_FILENO)");
934
ret = close(devnull);
936
perror_plus("close");
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
949
if(helperdir_fd == -1){
951
_exit(EX_UNAVAILABLE);
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
956
perror_plus("openat");
958
_exit(EX_UNAVAILABLE);
962
#pragma GCC diagnostic push
963
#pragma GCC diagnostic ignored "-Wcast-qual"
965
if(fexecve(helper_fd, (char *const [])
966
{ helper, add ? add_arg : delete_arg, (char *)address,
967
interface, debug ? debug_flag : NULL, NULL },
970
#pragma GCC diagnostic pop
972
perror_plus("fexecve");
984
pret = waitpid(pid, &status, 0);
985
if(pret == -1 and errno == EINTR and quit_now){
986
int errno_raising = 0;
987
if((errno = raise_privileges()) != 0){
988
errno_raising = errno;
989
perror_plus("Failed to raise privileges in order to"
990
" kill helper program");
992
if(kill(pid, SIGTERM) == -1){
995
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
996
perror_plus("Failed to lower privileges after killing"
1001
} while(pret == -1 and errno == EINTR);
1003
perror_plus("waitpid");
1006
if(WIFEXITED(status)){
1007
if(WEXITSTATUS(status) != 0){
1008
fprintf_plus(stderr, "Error: iprouteadddel exited"
1009
" with status %d\n", WEXITSTATUS(status));
1014
if(WIFSIGNALED(status)){
1015
fprintf_plus(stderr, "Error: iprouteadddel died by"
1016
" signal %d\n", WTERMSIG(status));
1019
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1023
__attribute__((nonnull, warn_unused_result))
1024
static bool add_local_route(const char *address,
1025
AvahiIfIndex if_index){
1027
fprintf_plus(stderr, "Adding route to %s\n", address);
1029
return add_delete_local_route(true, address, if_index);
1032
__attribute__((nonnull, warn_unused_result))
1033
static bool delete_local_route(const char *address,
1034
AvahiIfIndex if_index){
1036
fprintf_plus(stderr, "Removing route to %s\n", address);
1038
return add_delete_local_route(false, address, if_index);
1041
439
/* Called when a Mandos server is found */
1042
__attribute__((nonnull, warn_unused_result))
1043
static int start_mandos_communication(const char *ip, in_port_t port,
440
static int start_mandos_communication(const char *ip, uint16_t port,
1044
441
AvahiIfIndex if_index,
1045
int af, mandos_context *mc){
1046
int ret, tcp_sd = -1;
1048
struct sockaddr_storage to;
444
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1049
445
char *buffer = NULL;
1050
char *decrypted_buffer = NULL;
446
char *decrypted_buffer;
1051
447
size_t buffer_length = 0;
1052
448
size_t buffer_capacity = 0;
449
ssize_t decrypted_buffer_size;
452
char interface[IF_NAMESIZE];
1055
453
gnutls_session_t session;
1056
int pf; /* Protocol family */
1057
bool route_added = false;
1074
fprintf_plus(stderr, "Bad address family: %d\n", af);
1079
/* If the interface is specified and we have a list of interfaces */
1080
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1081
/* Check if the interface is one of the interfaces we are using */
1084
char *interface = NULL;
1085
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1094
/* This interface does not match any in the list, so we don't
1095
connect to the server */
1097
char interface[IF_NAMESIZE];
1098
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1099
perror_plus("if_indextoname");
1101
fprintf_plus(stderr, "Skipping server on non-used interface"
1103
if_indextoname((unsigned int)if_index,
455
ret = init_gnutls_session (mc, &session);
461
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
465
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
472
if(if_indextoname((unsigned int)if_index, interface) == NULL){
473
perror("if_indextoname");
476
fprintf(stderr, "Binding to interface %s\n", interface);
1111
ret = init_gnutls_session(&session, mc);
479
memset(&to, 0, sizeof(to));
480
to.in6.sin6_family = AF_INET6;
481
/* It would be nice to have a way to detect if we were passed an
482
IPv4 address here. Now we assume an IPv6 address. */
483
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
1117
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1118
PRIuMAX "\n", ip, (uintmax_t)port);
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1124
perror_plus("socket");
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
1145
perror_plus("inet_pton");
1151
fprintf_plus(stderr, "Bad address: %s\n", ip);
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1159
if(if_index == AVAHI_IF_UNSPEC){
1160
fprintf_plus(stderr, "An IPv6 link-local address is"
1161
" incomplete without a network interface\n");
1165
/* Set the network interface number as scope */
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
489
fprintf(stderr, "Bad address: %s\n", ip);
492
to.in6.sin6_port = htons(port); /* Spurious warning */
494
to.in6.sin6_scope_id = (uint32_t)if_index;
1178
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1179
char interface[IF_NAMESIZE];
1180
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1181
perror_plus("if_indextoname");
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
1190
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1191
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
1195
addrstr, sizeof(addrstr), NULL, 0,
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
1200
addrstr, sizeof(addrstr), NULL, 0,
1203
if(ret == EAI_SYSTEM){
1204
perror_plus("getnameinfo");
1205
} else if(ret != 0) {
1206
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1207
} else if(strcmp(addrstr, ip) != 0){
1208
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1244
Avahi bug reference:
1245
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1253
route_added = add_local_route(ip, if_index);
1259
if(errno != ECONNREFUSED or debug){
1261
perror_plus("connect");
497
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
499
char addrstr[INET6_ADDRSTRLEN] = "";
500
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
501
sizeof(addrstr)) == NULL){
504
if(strcmp(addrstr, ip) != 0){
505
fprintf(stderr, "Canonical address form: %s\n", addrstr);
510
ret = connect(tcp_sd, &to.in, sizeof(to));
1274
516
const char *out = mandos_protocol_version;
1277
519
size_t out_size = strlen(out);
1278
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1279
out_size - written));
1282
perror_plus("write");
520
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
521
out_size - written));
1284
525
goto mandos_end;
1286
527
written += (size_t)ret;
1287
528
if(written < out_size){
1290
if(out == mandos_protocol_version){
531
if (out == mandos_protocol_version){
1305
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1313
/* This casting via intptr_t is to eliminate warning about casting
1314
an int to a pointer type. This is exactly how the GnuTLS Guile
1315
function "set-session-transport-fd!" does it. */
1316
gnutls_transport_set_ptr(session,
1317
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1325
ret = gnutls_handshake(session);
541
fprintf(stderr, "Establishing TLS session with %s\n", ip);
544
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
547
ret = gnutls_handshake (session);
1330
548
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1332
if(ret != GNUTLS_E_SUCCESS){
550
if (ret != GNUTLS_E_SUCCESS){
1334
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
552
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1338
556
goto mandos_end;
1341
559
/* Read OpenPGP packet that contains the wanted password */
1344
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
562
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
1355
buffer_capacity = incbuffer(&buffer, buffer_length,
1357
if(buffer_capacity == 0){
1359
perror_plus("incbuffer");
1369
sret = gnutls_record_recv(session, buffer+buffer_length,
567
buffer_capacity = adjustbuffer(&buffer, buffer_length,
569
if (buffer_capacity == 0){
570
perror("adjustbuffer");
575
ret = gnutls_record_recv(session, buffer+buffer_length,
1376
582
case GNUTLS_E_INTERRUPTED:
1377
583
case GNUTLS_E_AGAIN:
1379
585
case GNUTLS_E_REHANDSHAKE:
1381
ret = gnutls_handshake(session);
587
ret = gnutls_handshake (session);
1387
588
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1389
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
590
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1393
593
goto mandos_end;
1397
fprintf_plus(stderr, "Unknown error while reading data from"
1398
" encrypted session with Mandos server\n");
1399
gnutls_bye(session, GNUTLS_SHUT_RDWR);
597
fprintf(stderr, "Unknown error while reading data from"
598
" encrypted session with Mandos server\n");
600
gnutls_bye (session, GNUTLS_SHUT_RDWR);
1401
601
goto mandos_end;
1404
buffer_length += (size_t) sret;
604
buffer_length += (size_t) ret;
1409
fprintf_plus(stderr, "Closing TLS session\n");
1418
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1423
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1425
if(buffer_length > 0){
1426
ssize_t decrypted_buffer_size;
1427
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1428
&decrypted_buffer, mc);
1429
if(decrypted_buffer_size >= 0){
609
fprintf(stderr, "Closing TLS session\n");
612
gnutls_bye (session, GNUTLS_SHUT_RDWR);
614
if (buffer_length > 0){
615
decrypted_buffer_size = pgp_packet_decrypt(buffer,
619
if (decrypted_buffer_size >= 0){
1432
621
while(written < (size_t) decrypted_buffer_size){
1438
ret = (int)fwrite(decrypted_buffer + written, 1,
1439
(size_t)decrypted_buffer_size - written,
622
ret = (int)fwrite (decrypted_buffer + written, 1,
623
(size_t)decrypted_buffer_size - written,
1441
625
if(ret == 0 and ferror(stdout)){
1444
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
627
fprintf(stderr, "Error writing encrypted data: %s\n",
1450
633
written += (size_t)ret;
635
free(decrypted_buffer);
1456
643
/* Shutdown procedure */
1461
if(not delete_local_route(ip, if_index)){
1462
fprintf_plus(stderr, "Failed to delete local route to %s on"
1463
" interface %d", ip, if_index);
1467
free(decrypted_buffer);
1470
ret = close(tcp_sd);
1476
perror_plus("close");
1478
gnutls_deinit(session);
648
gnutls_deinit (session);
1488
__attribute__((nonnull))
1489
652
static void resolve_callback(AvahiSServiceResolver *r,
1490
653
AvahiIfIndex interface,
1491
AvahiProtocol proto,
654
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1492
655
AvahiResolverEvent event,
1493
656
const char *name,
1494
657
const char *type,
1603
740
case AVAHI_BROWSER_ALL_FOR_NOW:
1604
741
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1606
fprintf_plus(stderr, "No Mandos server found, still"
743
fprintf(stderr, "No Mandos server found, still searching...\n");
1613
/* Signal handler that stops main loop after SIGTERM */
1614
static void handle_sigterm(int sig){
1619
signal_received = sig;
1620
int old_errno = errno;
1621
/* set main loop to exit */
1622
if(simple_poll != NULL){
1623
avahi_simple_poll_quit(simple_poll);
1628
__attribute__((nonnull, warn_unused_result))
1629
bool get_flags(const char *ifname, struct ifreq *ifr){
1633
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1636
perror_plus("socket");
1640
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1641
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1642
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1646
perror_plus("ioctl SIOCGIFFLAGS");
1654
__attribute__((nonnull, warn_unused_result))
1655
bool good_flags(const char *ifname, const struct ifreq *ifr){
1657
/* Reject the loopback device */
1658
if(ifr->ifr_flags & IFF_LOOPBACK){
1660
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1665
/* Accept point-to-point devices only if connect_to is specified */
1666
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1668
fprintf_plus(stderr, "Accepting point-to-point interface"
1669
" \"%s\"\n", ifname);
1673
/* Otherwise, reject non-broadcast-capable devices */
1674
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1676
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1677
" \"%s\"\n", ifname);
1681
/* Reject non-ARP interfaces (including dummy interfaces) */
1682
if(ifr->ifr_flags & IFF_NOARP){
1684
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1690
/* Accept this device */
1692
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1698
* This function determines if a directory entry in /sys/class/net
1699
* corresponds to an acceptable network device.
1700
* (This function is passed to scandir(3) as a filter function.)
1702
__attribute__((nonnull, warn_unused_result))
1703
int good_interface(const struct dirent *if_entry){
1704
if(if_entry->d_name[0] == '.'){
1709
if(not get_flags(if_entry->d_name, &ifr)){
1711
fprintf_plus(stderr, "Failed to get flags for interface "
1712
"\"%s\"\n", if_entry->d_name);
1717
if(not good_flags(if_entry->d_name, &ifr)){
1724
* This function determines if a network interface is up.
1726
__attribute__((nonnull, warn_unused_result))
1727
bool interface_is_up(const char *interface){
1729
if(not get_flags(interface, &ifr)){
1731
fprintf_plus(stderr, "Failed to get flags for interface "
1732
"\"%s\"\n", interface);
1737
return (bool)(ifr.ifr_flags & IFF_UP);
1741
* This function determines if a network interface is running
1743
__attribute__((nonnull, warn_unused_result))
1744
bool interface_is_running(const char *interface){
1746
if(not get_flags(interface, &ifr)){
1748
fprintf_plus(stderr, "Failed to get flags for interface "
1749
"\"%s\"\n", interface);
1754
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1757
__attribute__((nonnull, pure, warn_unused_result))
1758
int notdotentries(const struct dirent *direntry){
1759
/* Skip "." and ".." */
1760
if(direntry->d_name[0] == '.'
1761
and (direntry->d_name[1] == '\0'
1762
or (direntry->d_name[1] == '.'
1763
and direntry->d_name[2] == '\0'))){
1769
/* Is this directory entry a runnable program? */
1770
__attribute__((nonnull, warn_unused_result))
1771
int runnable_hook(const struct dirent *direntry){
1776
if((direntry->d_name)[0] == '\0'){
1781
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1782
"abcdefghijklmnopqrstuvwxyz"
1785
if((direntry->d_name)[sret] != '\0'){
1786
/* Contains non-allowed characters */
1788
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1794
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1797
perror_plus("Could not stat hook");
1801
if(not (S_ISREG(st.st_mode))){
1802
/* Not a regular file */
1804
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1809
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1810
/* Not executable */
1812
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1818
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1824
__attribute__((nonnull, warn_unused_result))
1825
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1826
mandos_context *mc){
1828
struct timespec now;
1829
struct timespec waited_time;
1830
intmax_t block_time;
1833
if(mc->current_server == NULL){
1835
fprintf_plus(stderr, "Wait until first server is found."
1838
ret = avahi_simple_poll_iterate(s, -1);
1841
fprintf_plus(stderr, "Check current_server if we should run"
1844
/* the current time */
1845
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1847
perror_plus("clock_gettime");
1850
/* Calculating in ms how long time between now and server
1851
who we visted longest time ago. Now - last seen. */
1852
waited_time.tv_sec = (now.tv_sec
1853
- mc->current_server->last_seen.tv_sec);
1854
waited_time.tv_nsec = (now.tv_nsec
1855
- mc->current_server->last_seen.tv_nsec);
1856
/* total time is 10s/10,000ms.
1857
Converting to s from ms by dividing by 1,000,
1858
and ns to ms by dividing by 1,000,000. */
1859
block_time = ((retry_interval
1860
- ((intmax_t)waited_time.tv_sec * 1000))
1861
- ((intmax_t)waited_time.tv_nsec / 1000000));
1864
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1868
if(block_time <= 0){
1869
ret = start_mandos_communication(mc->current_server->ip,
1870
mc->current_server->port,
1871
mc->current_server->if_index,
1872
mc->current_server->af, mc);
1874
avahi_simple_poll_quit(s);
1877
ret = clock_gettime(CLOCK_MONOTONIC,
1878
&mc->current_server->last_seen);
1880
perror_plus("clock_gettime");
1883
mc->current_server = mc->current_server->next;
1884
block_time = 0; /* Call avahi to find new Mandos
1885
servers, but don't block */
1888
ret = avahi_simple_poll_iterate(s, (int)block_time);
1891
if(ret > 0 or errno != EINTR){
1892
return (ret != 1) ? ret : 0;
1898
__attribute__((nonnull))
1899
void run_network_hooks(const char *mode, const char *interface,
1901
struct dirent **direntries = NULL;
1902
if(hookdir_fd == -1){
1903
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1905
if(hookdir_fd == -1){
1906
if(errno == ENOENT){
1908
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1909
" found\n", hookdir);
1912
perror_plus("open");
1918
#if __GLIBC_PREREQ(2, 15)
1919
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1920
runnable_hook, alphasort);
1921
#else /* not __GLIBC_PREREQ(2, 15) */
1922
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1924
#endif /* not __GLIBC_PREREQ(2, 15) */
1925
#else /* not __GLIBC__ */
1926
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1928
#endif /* not __GLIBC__ */
1930
perror_plus("scandir");
1933
struct dirent *direntry;
1935
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1937
perror_plus("open(\"/dev/null\", O_RDONLY)");
1940
for(int i = 0; i < numhooks; i++){
1941
direntry = direntries[i];
1943
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1946
pid_t hook_pid = fork();
1949
/* Raise privileges */
1950
errno = raise_privileges_permanently();
1952
perror_plus("Failed to raise privileges");
1959
perror_plus("setgid");
1962
/* Reset supplementary groups */
1964
ret = setgroups(0, NULL);
1966
perror_plus("setgroups");
1969
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1971
perror_plus("setenv");
1974
ret = setenv("DEVICE", interface, 1);
1976
perror_plus("setenv");
1979
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1981
perror_plus("setenv");
1984
ret = setenv("MODE", mode, 1);
1986
perror_plus("setenv");
1990
ret = asprintf(&delaystring, "%f", (double)delay);
1992
perror_plus("asprintf");
1995
ret = setenv("DELAY", delaystring, 1);
1998
perror_plus("setenv");
2002
if(connect_to != NULL){
2003
ret = setenv("CONNECT", connect_to, 1);
2005
perror_plus("setenv");
2009
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2013
perror_plus("openat");
2014
_exit(EXIT_FAILURE);
2016
if(close(hookdir_fd) == -1){
2017
perror_plus("close");
2018
_exit(EXIT_FAILURE);
2020
ret = dup2(devnull, STDIN_FILENO);
2022
perror_plus("dup2(devnull, STDIN_FILENO)");
2025
ret = close(devnull);
2027
perror_plus("close");
2030
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2032
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2035
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2037
perror_plus("fexecve");
2038
_exit(EXIT_FAILURE);
2042
perror_plus("fork");
2047
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2048
perror_plus("waitpid");
2052
if(WIFEXITED(status)){
2053
if(WEXITSTATUS(status) != 0){
2054
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2055
" with status %d\n", direntry->d_name,
2056
WEXITSTATUS(status));
2060
} else if(WIFSIGNALED(status)){
2061
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2062
" signal %d\n", direntry->d_name,
2067
fprintf_plus(stderr, "Warning: network hook \"%s\""
2068
" crashed\n", direntry->d_name);
2074
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2080
if(close(hookdir_fd) == -1){
2081
perror_plus("close");
2088
__attribute__((nonnull, warn_unused_result))
2089
error_t bring_up_interface(const char *const interface,
2091
error_t old_errno = errno;
2093
struct ifreq network;
2094
unsigned int if_index = if_nametoindex(interface);
2096
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2106
if(not interface_is_up(interface)){
2107
error_t ret_errno = 0, ioctl_errno = 0;
2108
if(not get_flags(interface, &network)){
2110
fprintf_plus(stderr, "Failed to get flags for interface "
2111
"\"%s\"\n", interface);
2115
network.ifr_flags |= IFF_UP; /* set flag */
2117
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2120
perror_plus("socket");
2128
perror_plus("close");
2135
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2139
/* Raise privileges */
2140
ret_errno = raise_privileges();
2143
perror_plus("Failed to raise privileges");
2148
bool restore_loglevel = false;
2150
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2151
messages about the network interface to mess up the prompt */
2152
ret_linux = klogctl(8, NULL, 5);
2153
if(ret_linux == -1){
2154
perror_plus("klogctl");
2156
restore_loglevel = true;
2159
#endif /* __linux__ */
2160
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2161
ioctl_errno = errno;
2163
if(restore_loglevel){
2164
ret_linux = klogctl(7, NULL, 0);
2165
if(ret_linux == -1){
2166
perror_plus("klogctl");
2169
#endif /* __linux__ */
2171
/* If raise_privileges() succeeded above */
2173
/* Lower privileges */
2174
ret_errno = lower_privileges();
2177
perror_plus("Failed to lower privileges");
2181
/* Close the socket */
2184
perror_plus("close");
2187
if(ret_setflags == -1){
2188
errno = ioctl_errno;
2189
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2194
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2198
/* Sleep checking until interface is running.
2199
Check every 0.25s, up to total time of delay */
2200
for(int i=0; i < delay * 4; i++){
2201
if(interface_is_running(interface)){
2204
struct timespec sleeptime = { .tv_nsec = 250000000 };
2205
ret = nanosleep(&sleeptime, NULL);
2206
if(ret == -1 and errno != EINTR){
2207
perror_plus("nanosleep");
2215
__attribute__((nonnull, warn_unused_result))
2216
error_t take_down_interface(const char *const interface){
2217
error_t old_errno = errno;
2218
struct ifreq network;
2219
unsigned int if_index = if_nametoindex(interface);
2221
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2225
if(interface_is_up(interface)){
2226
error_t ret_errno = 0, ioctl_errno = 0;
2227
if(not get_flags(interface, &network) and debug){
2229
fprintf_plus(stderr, "Failed to get flags for interface "
2230
"\"%s\"\n", interface);
2234
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2236
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2239
perror_plus("socket");
2245
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2249
/* Raise privileges */
2250
ret_errno = raise_privileges();
2253
perror_plus("Failed to raise privileges");
2256
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2257
ioctl_errno = errno;
2259
/* If raise_privileges() succeeded above */
2261
/* Lower privileges */
2262
ret_errno = lower_privileges();
2265
perror_plus("Failed to lower privileges");
2269
/* Close the socket */
2270
int ret = close(sd);
2272
perror_plus("close");
2275
if(ret_setflags == -1){
2276
errno = ioctl_errno;
2277
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2282
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
749
/* Combines file name and path and returns the malloced new
750
string. some sane checks could/should be added */
751
static char *combinepath(const char *first, const char *second){
753
int ret = asprintf(&tmp, "%s/%s", first, second);
2290
761
int main(int argc, char *argv[]){
2291
mandos_context mc = { .server = NULL, .dh_bits = 0,
2292
.priority = "SECURE256:!CTYPE-X.509"
2293
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2294
.current_server = NULL, .interfaces = NULL,
2295
.interfaces_size = 0 };
2296
AvahiSServiceBrowser *sb = NULL;
2301
int exitcode = EXIT_SUCCESS;
2302
char *interfaces_to_take_down = NULL;
2303
size_t interfaces_to_take_down_size = 0;
2304
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2305
char old_tempdir[] = "/tmp/mandosXXXXXX";
2306
char *tempdir = NULL;
2307
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2308
const char *seckey = PATHDIR "/" SECKEY;
2309
const char *pubkey = PATHDIR "/" PUBKEY;
2310
const char *dh_params_file = NULL;
2311
char *interfaces_hooks = NULL;
2313
bool gnutls_initialized = false;
2314
bool gpgme_initialized = false;
2316
double retry_interval = 10; /* 10s between trying a server and
2317
retrying the same server again */
2319
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2320
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2325
/* Lower any group privileges we might have, just to be safe */
2329
perror_plus("setgid");
2332
/* Lower user privileges (temporarily) */
2336
perror_plus("seteuid");
2344
struct argp_option options[] = {
2345
{ .name = "debug", .key = 128,
2346
.doc = "Debug mode", .group = 3 },
2347
{ .name = "connect", .key = 'c',
2348
.arg = "ADDRESS:PORT",
2349
.doc = "Connect directly to a specific Mandos server",
2351
{ .name = "interface", .key = 'i',
2353
.doc = "Network interface that will be used to search for"
2356
{ .name = "seckey", .key = 's',
2358
.doc = "OpenPGP secret key file base name",
2360
{ .name = "pubkey", .key = 'p',
2362
.doc = "OpenPGP public key file base name",
2364
{ .name = "dh-bits", .key = 129,
2366
.doc = "Bit length of the prime number used in the"
2367
" Diffie-Hellman key exchange",
2369
{ .name = "dh-params", .key = 134,
2371
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2372
" for the Diffie-Hellman key exchange",
2374
{ .name = "priority", .key = 130,
2376
.doc = "GnuTLS priority string for the TLS handshake",
2378
{ .name = "delay", .key = 131,
2380
.doc = "Maximum delay to wait for interface startup",
2382
{ .name = "retry", .key = 132,
2384
.doc = "Retry interval used when denied by the Mandos server",
2386
{ .name = "network-hook-dir", .key = 133,
2388
.doc = "Directory where network hooks are located",
2391
* These reproduce what we would get without ARGP_NO_HELP
2393
{ .name = "help", .key = '?',
2394
.doc = "Give this help list", .group = -1 },
2395
{ .name = "usage", .key = -3,
2396
.doc = "Give a short usage message", .group = -1 },
2397
{ .name = "version", .key = 'V',
2398
.doc = "Print program version", .group = -1 },
2402
error_t parse_opt(int key, char *arg,
2403
struct argp_state *state){
762
AvahiSServiceBrowser *sb = NULL;
765
int exitcode = EXIT_SUCCESS;
766
const char *interface = "eth0";
767
struct ifreq network;
771
char *connect_to = NULL;
772
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
773
char *pubkeyfilename = NULL;
774
char *seckeyfilename = NULL;
775
const char *pubkeyname = "pubkey.txt";
776
const char *seckeyname = "seckey.txt";
777
mandos_context mc = { .simple_poll = NULL, .server = NULL,
778
.dh_bits = 1024, .priority = "SECURE256"};
779
bool gnutls_initalized = false;
782
struct argp_option options[] = {
783
{ .name = "debug", .key = 128,
784
.doc = "Debug mode", .group = 3 },
785
{ .name = "connect", .key = 'c',
787
.doc = "Connect directly to a sepcified mandos server",
789
{ .name = "interface", .key = 'i',
791
.doc = "Interface that Avahi will conntect through",
793
{ .name = "keydir", .key = 'd',
795
.doc = "Directory where the openpgp keyring is",
797
{ .name = "seckey", .key = 's',
799
.doc = "Secret openpgp key for gnutls authentication",
801
{ .name = "pubkey", .key = 'p',
803
.doc = "Public openpgp key for gnutls authentication",
805
{ .name = "dh-bits", .key = 129,
807
.doc = "dh-bits to use in gnutls communication",
809
{ .name = "priority", .key = 130,
811
.doc = "GNUTLS priority", .group = 1 },
816
error_t parse_opt (int key, char *arg,
817
struct argp_state *state) {
818
/* Get the INPUT argument from `argp_parse', which we know is
819
a pointer to our plugin list pointer. */
841
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
855
return ARGP_ERR_UNKNOWN;
860
struct argp argp = { .options = options, .parser = parse_opt,
862
.doc = "Mandos client -- Get and decrypt"
863
" passwords from mandos server" };
864
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
865
if (ret == ARGP_ERR_UNKNOWN){
866
fprintf(stderr, "Unknown error while parsing arguments\n");
867
exitcode = EXIT_FAILURE;
872
pubkeyfilename = combinepath(keydir, pubkeyname);
873
if (pubkeyfilename == NULL){
874
perror("combinepath");
875
exitcode = EXIT_FAILURE;
879
seckeyfilename = combinepath(keydir, seckeyname);
880
if (seckeyfilename == NULL){
881
perror("combinepath");
882
exitcode = EXIT_FAILURE;
886
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
888
fprintf(stderr, "init_gnutls_global failed\n");
889
exitcode = EXIT_FAILURE;
892
gnutls_initalized = true;
895
/* If the interface is down, bring it up */
897
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
900
exitcode = EXIT_FAILURE;
903
strcpy(network.ifr_name, interface);
904
ret = ioctl(sd, SIOCGIFFLAGS, &network);
906
perror("ioctl SIOCGIFFLAGS");
907
exitcode = EXIT_FAILURE;
910
if((network.ifr_flags & IFF_UP) == 0){
911
network.ifr_flags |= IFF_UP;
912
ret = ioctl(sd, SIOCSIFFLAGS, &network);
914
perror("ioctl SIOCSIFFLAGS");
915
exitcode = EXIT_FAILURE;
935
if_index = (AvahiIfIndex) if_nametoindex(interface);
937
fprintf(stderr, "No such interface: \"%s\"\n", interface);
941
if(connect_to != NULL){
942
/* Connect directly, do not use Zeroconf */
943
/* (Mainly meant for debugging) */
944
char *address = strrchr(connect_to, ':');
946
fprintf(stderr, "No colon in address\n");
947
exitcode = EXIT_FAILURE;
2406
case 128: /* --debug */
2409
case 'c': /* --connect */
2412
case 'i': /* --interface */
2413
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2416
argp_error(state, "%s", strerror(ret_errno));
2419
case 's': /* --seckey */
2422
case 'p': /* --pubkey */
2425
case 129: /* --dh-bits */
2427
tmpmax = strtoimax(arg, &tmp, 10);
2428
if(errno != 0 or tmp == arg or *tmp != '\0'
2429
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2430
argp_error(state, "Bad number of DH bits");
2432
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2434
case 134: /* --dh-params */
2435
dh_params_file = arg;
2437
case 130: /* --priority */
2440
case 131: /* --delay */
2442
delay = strtof(arg, &tmp);
2443
if(errno != 0 or tmp == arg or *tmp != '\0'){
2444
argp_error(state, "Bad delay");
2446
case 132: /* --retry */
2448
retry_interval = strtod(arg, &tmp);
2449
if(errno != 0 or tmp == arg or *tmp != '\0'
2450
or (retry_interval * 1000) > INT_MAX
2451
or retry_interval < 0){
2452
argp_error(state, "Bad retry interval");
2455
case 133: /* --network-hook-dir */
2459
* These reproduce what we would get without ARGP_NO_HELP
2461
case '?': /* --help */
2462
argp_state_help(state, state->out_stream,
2463
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2464
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2465
case -3: /* --usage */
2466
argp_state_help(state, state->out_stream,
2467
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2468
case 'V': /* --version */
2469
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2470
exit(argp_err_exit_status);
2473
return ARGP_ERR_UNKNOWN;
2478
struct argp argp = { .options = options, .parser = parse_opt,
2480
.doc = "Mandos client -- Get and decrypt"
2481
" passwords from a Mandos server" };
2482
ret = argp_parse(&argp, argc, argv,
2483
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2490
perror_plus("argp_parse");
2491
exitcode = EX_OSERR;
2494
exitcode = EX_USAGE;
2500
/* Work around Debian bug #633582:
2501
<http://bugs.debian.org/633582> */
2503
/* Re-raise privileges */
2504
ret_errno = raise_privileges();
2507
perror_plus("Failed to raise privileges");
2511
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2512
int seckey_fd = open(seckey, O_RDONLY);
2513
if(seckey_fd == -1){
2514
perror_plus("open");
2516
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2518
perror_plus("fstat");
2520
if(S_ISREG(st.st_mode)
2521
and st.st_uid == 0 and st.st_gid == 0){
2522
ret = fchown(seckey_fd, uid, gid);
2524
perror_plus("fchown");
2532
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2533
int pubkey_fd = open(pubkey, O_RDONLY);
2534
if(pubkey_fd == -1){
2535
perror_plus("open");
2537
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2539
perror_plus("fstat");
2541
if(S_ISREG(st.st_mode)
2542
and st.st_uid == 0 and st.st_gid == 0){
2543
ret = fchown(pubkey_fd, uid, gid);
2545
perror_plus("fchown");
2553
if(dh_params_file != NULL
2554
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2555
int dhparams_fd = open(dh_params_file, O_RDONLY);
2556
if(dhparams_fd == -1){
2557
perror_plus("open");
2559
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2561
perror_plus("fstat");
2563
if(S_ISREG(st.st_mode)
2564
and st.st_uid == 0 and st.st_gid == 0){
2565
ret = fchown(dhparams_fd, uid, gid);
2567
perror_plus("fchown");
2575
/* Lower privileges */
2576
ret_errno = lower_privileges();
2579
perror_plus("Failed to lower privileges");
2584
/* Remove invalid interface names (except "none") */
2586
char *interface = NULL;
2587
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2589
if(strcmp(interface, "none") != 0
2590
and if_nametoindex(interface) == 0){
2591
if(interface[0] != '\0'){
2592
fprintf_plus(stderr, "Not using nonexisting interface"
2593
" \"%s\"\n", interface);
2595
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2601
/* Run network hooks */
2603
if(mc.interfaces != NULL){
2604
interfaces_hooks = malloc(mc.interfaces_size);
2605
if(interfaces_hooks == NULL){
2606
perror_plus("malloc");
951
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
953
perror("Bad port number");
954
exitcode = EXIT_FAILURE;
2609
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2610
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2612
run_network_hooks("start", interfaces_hooks != NULL ?
2613
interfaces_hooks : "", delay);
2617
avahi_set_log_function(empty_log);
2620
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2621
from the signal handler */
2622
/* Initialize the pseudo-RNG for Avahi */
2623
srand((unsigned int) time(NULL));
2624
simple_poll = avahi_simple_poll_new();
2625
if(simple_poll == NULL){
2626
fprintf_plus(stderr,
2627
"Avahi: Failed to create simple poll object.\n");
2628
exitcode = EX_UNAVAILABLE;
2632
sigemptyset(&sigterm_action.sa_mask);
2633
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2635
perror_plus("sigaddset");
2636
exitcode = EX_OSERR;
2639
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2641
perror_plus("sigaddset");
2642
exitcode = EX_OSERR;
2645
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2647
perror_plus("sigaddset");
2648
exitcode = EX_OSERR;
2651
/* Need to check if the handler is SIG_IGN before handling:
2652
| [[info:libc:Initial Signal Actions]] |
2653
| [[info:libc:Basic Signal Handling]] |
2655
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2657
perror_plus("sigaction");
2660
if(old_sigterm_action.sa_handler != SIG_IGN){
2661
ret = sigaction(SIGINT, &sigterm_action, NULL);
2663
perror_plus("sigaction");
2664
exitcode = EX_OSERR;
2668
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2670
perror_plus("sigaction");
2673
if(old_sigterm_action.sa_handler != SIG_IGN){
2674
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2676
perror_plus("sigaction");
2677
exitcode = EX_OSERR;
2681
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2683
perror_plus("sigaction");
2686
if(old_sigterm_action.sa_handler != SIG_IGN){
2687
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2689
perror_plus("sigaction");
2690
exitcode = EX_OSERR;
2695
/* If no interfaces were specified, make a list */
2696
if(mc.interfaces == NULL){
2697
struct dirent **direntries = NULL;
2698
/* Look for any good interfaces */
2699
ret = scandir(sys_class_net, &direntries, good_interface,
2702
/* Add all found interfaces to interfaces list */
2703
for(int i = 0; i < ret; ++i){
2704
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2705
direntries[i]->d_name);
2708
perror_plus("argz_add");
2709
free(direntries[i]);
2713
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2714
direntries[i]->d_name);
2716
free(direntries[i]);
2723
fprintf_plus(stderr, "Could not find a network interface\n");
2724
exitcode = EXIT_FAILURE;
2729
/* Bring up interfaces which are down, and remove any "none"s */
2731
char *interface = NULL;
2732
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2734
/* If interface name is "none", stop bringing up interfaces.
2735
Also remove all instances of "none" from the list */
2736
if(strcmp(interface, "none") == 0){
2737
argz_delete(&mc.interfaces, &mc.interfaces_size,
2740
while((interface = argz_next(mc.interfaces,
2741
mc.interfaces_size, interface))){
2742
if(strcmp(interface, "none") == 0){
2743
argz_delete(&mc.interfaces, &mc.interfaces_size,
2750
bool interface_was_up = interface_is_up(interface);
2751
errno = bring_up_interface(interface, delay);
2752
if(not interface_was_up){
2754
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2755
" %s\n", interface, strerror(errno));
2757
errno = argz_add(&interfaces_to_take_down,
2758
&interfaces_to_take_down_size,
2761
perror_plus("argz_add");
2766
if(debug and (interfaces_to_take_down == NULL)){
2767
fprintf_plus(stderr, "No interfaces were brought up\n");
2771
/* If we only got one interface, explicitly use only that one */
2772
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2774
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2777
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2784
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2786
fprintf_plus(stderr, "init_gnutls_global failed\n");
2787
exitcode = EX_UNAVAILABLE;
2790
gnutls_initialized = true;
2797
/* Try /run/tmp before /tmp */
2798
tempdir = mkdtemp(run_tempdir);
2799
if(tempdir == NULL and errno == ENOENT){
2801
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2802
run_tempdir, old_tempdir);
2804
tempdir = mkdtemp(old_tempdir);
2806
if(tempdir == NULL){
2807
perror_plus("mkdtemp");
2815
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2816
fprintf_plus(stderr, "init_gpgme failed\n");
2817
exitcode = EX_UNAVAILABLE;
2820
gpgme_initialized = true;
2827
if(connect_to != NULL){
2828
/* Connect directly, do not use Zeroconf */
2829
/* (Mainly meant for debugging) */
2830
char *address = strrchr(connect_to, ':');
2832
if(address == NULL){
2833
fprintf_plus(stderr, "No colon in address\n");
2834
exitcode = EX_USAGE;
2844
tmpmax = strtoimax(address+1, &tmp, 10);
2845
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2846
or tmpmax != (in_port_t)tmpmax){
2847
fprintf_plus(stderr, "Bad port number\n");
2848
exitcode = EX_USAGE;
2856
port = (in_port_t)tmpmax;
2858
/* Colon in address indicates IPv6 */
2860
if(strchr(connect_to, ':') != NULL){
2862
/* Accept [] around IPv6 address - see RFC 5952 */
2863
if(connect_to[0] == '[' and address[-1] == ']')
2871
address = connect_to;
2877
while(not quit_now){
2878
ret = start_mandos_communication(address, port, if_index, af,
2880
if(quit_now or ret == 0){
2884
fprintf_plus(stderr, "Retrying in %d seconds\n",
2885
(int)retry_interval);
2887
sleep((unsigned int)retry_interval);
2891
exitcode = EXIT_SUCCESS;
2902
AvahiServerConfig config;
2903
/* Do not publish any local Zeroconf records */
2904
avahi_server_config_init(&config);
2905
config.publish_hinfo = 0;
2906
config.publish_addresses = 0;
2907
config.publish_workstation = 0;
2908
config.publish_domain = 0;
2910
/* Allocate a new server */
2911
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2912
&config, NULL, NULL, &ret_errno);
2914
/* Free the Avahi configuration data */
2915
avahi_server_config_free(&config);
2918
/* Check if creating the Avahi server object succeeded */
2919
if(mc.server == NULL){
2920
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2921
avahi_strerror(ret_errno));
2922
exitcode = EX_UNAVAILABLE;
2930
/* Create the Avahi service browser */
2931
sb = avahi_s_service_browser_new(mc.server, if_index,
2932
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2933
NULL, 0, browse_callback,
2936
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2937
avahi_strerror(avahi_server_errno(mc.server)));
2938
exitcode = EX_UNAVAILABLE;
2946
/* Run the main loop */
2949
fprintf_plus(stderr, "Starting Avahi loop search\n");
2952
ret = avahi_loop_with_timeout(simple_poll,
2953
(int)(retry_interval * 1000), &mc);
2955
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2956
(ret == 0) ? "successfully" : "with error");
958
address = connect_to;
959
ret = start_mandos_communication(address, port, if_index, &mc);
961
exitcode = EXIT_FAILURE;
963
exitcode = EXIT_SUCCESS;
969
avahi_set_log_function(empty_log);
972
/* Initialize the pseudo-RNG for Avahi */
973
srand((unsigned int) time(NULL));
975
/* Allocate main Avahi loop object */
976
mc.simple_poll = avahi_simple_poll_new();
977
if (mc.simple_poll == NULL) {
978
fprintf(stderr, "Avahi: Failed to create simple poll"
980
exitcode = EXIT_FAILURE;
985
AvahiServerConfig config;
986
/* Do not publish any local Zeroconf records */
987
avahi_server_config_init(&config);
988
config.publish_hinfo = 0;
989
config.publish_addresses = 0;
990
config.publish_workstation = 0;
991
config.publish_domain = 0;
993
/* Allocate a new server */
994
mc.server = avahi_server_new(avahi_simple_poll_get
995
(mc.simple_poll), &config, NULL,
998
/* Free the Avahi configuration data */
999
avahi_server_config_free(&config);
1002
/* Check if creating the Avahi server object succeeded */
1003
if (mc.server == NULL) {
1004
fprintf(stderr, "Failed to create Avahi server: %s\n",
1005
avahi_strerror(error));
1006
exitcode = EXIT_FAILURE;
1010
/* Create the Avahi service browser */
1011
sb = avahi_s_service_browser_new(mc.server, if_index,
1013
"_mandos._tcp", NULL, 0,
1014
browse_callback, &mc);
1016
fprintf(stderr, "Failed to create service browser: %s\n",
1017
avahi_strerror(avahi_server_errno(mc.server)));
1018
exitcode = EXIT_FAILURE;
1022
/* Run the main loop */
1025
fprintf(stderr, "Starting Avahi loop search\n");
1028
avahi_simple_poll_loop(mc.simple_poll);
2962
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2965
/* Cleanup things */
2966
free(mc.interfaces);
2969
avahi_s_service_browser_free(sb);
2971
if(mc.server != NULL)
2972
avahi_server_free(mc.server);
2974
if(simple_poll != NULL)
2975
avahi_simple_poll_free(simple_poll);
2977
if(gnutls_initialized){
2978
gnutls_certificate_free_credentials(mc.cred);
2979
gnutls_global_deinit();
2980
gnutls_dh_params_deinit(mc.dh_params);
2983
if(gpgme_initialized){
2984
gpgme_release(mc.ctx);
2987
/* Cleans up the circular linked list of Mandos servers the client
2989
if(mc.current_server != NULL){
2990
mc.current_server->prev->next = NULL;
2991
while(mc.current_server != NULL){
2992
server *next = mc.current_server->next;
2994
#pragma GCC diagnostic push
2995
#pragma GCC diagnostic ignored "-Wcast-qual"
2997
free((char *)(mc.current_server->ip));
2999
#pragma GCC diagnostic pop
3001
free(mc.current_server);
3002
mc.current_server = next;
3006
/* Re-raise privileges */
3008
ret_errno = raise_privileges();
3011
perror_plus("Failed to raise privileges");
3014
/* Run network hooks */
3015
run_network_hooks("stop", interfaces_hooks != NULL ?
3016
interfaces_hooks : "", delay);
3018
/* Take down the network interfaces which were brought up */
3020
char *interface = NULL;
3021
while((interface=argz_next(interfaces_to_take_down,
3022
interfaces_to_take_down_size,
3024
ret_errno = take_down_interface(interface);
3027
perror_plus("Failed to take down interface");
3030
if(debug and (interfaces_to_take_down == NULL)){
3031
fprintf_plus(stderr, "No interfaces needed to be taken"
3037
ret_errno = lower_privileges_permanently();
3040
perror_plus("Failed to lower privileges permanently");
3044
free(interfaces_to_take_down);
3045
free(interfaces_hooks);
3047
/* Removes the GPGME temp directory and all files inside */
3048
if(tempdir != NULL){
3049
struct dirent **direntries = NULL;
3050
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3054
if(tempdir_fd == -1){
3055
perror_plus("open");
3058
#if __GLIBC_PREREQ(2, 15)
3059
int numentries = scandirat(tempdir_fd, ".", &direntries,
3060
notdotentries, alphasort);
3061
#else /* not __GLIBC_PREREQ(2, 15) */
3062
int numentries = scandir(tempdir, &direntries, notdotentries,
3064
#endif /* not __GLIBC_PREREQ(2, 15) */
3065
#else /* not __GLIBC__ */
3066
int numentries = scandir(tempdir, &direntries, notdotentries,
3068
#endif /* not __GLIBC__ */
3069
if(numentries >= 0){
3070
for(int i = 0; i < numentries; i++){
3071
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3073
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3074
" \"%s\", 0): %s\n", tempdir,
3075
direntries[i]->d_name, strerror(errno));
3077
free(direntries[i]);
3080
/* need to clean even if 0 because man page doesn't specify */
3082
if(numentries == -1){
3083
perror_plus("scandir");
3085
ret = rmdir(tempdir);
3086
if(ret == -1 and errno != ENOENT){
3087
perror_plus("rmdir");
3095
sigemptyset(&old_sigterm_action.sa_mask);
3096
old_sigterm_action.sa_handler = SIG_DFL;
3097
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3098
&old_sigterm_action,
3101
perror_plus("sigaction");
3104
ret = raise(signal_received);
3105
} while(ret != 0 and errno == EINTR);
3107
perror_plus("raise");
3110
TEMP_FAILURE_RETRY(pause());
1033
fprintf(stderr, "%s exiting\n", argv[0]);
1036
/* Cleanup things */
1038
avahi_s_service_browser_free(sb);
1040
if (mc.server != NULL)
1041
avahi_server_free(mc.server);
1043
if (mc.simple_poll != NULL)
1044
avahi_simple_poll_free(mc.simple_poll);
1045
free(pubkeyfilename);
1046
free(seckeyfilename);
1048
if (gnutls_initalized){
1049
gnutls_certificate_free_credentials(mc.cred);
1050
gnutls_global_deinit ();