112
82
#include <avahi-common/error.h>
115
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
85
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
118
87
init_gnutls_session(),
120
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
90
GNUTLS_OPENPGP_FMT_BASE64 */
125
#include <gpgme.h> /* All GPGME types, constants and
93
#include <gpgme.h> /* All GPGME types, constants and functions
128
95
GPGME_PROTOCOL_OpenPGP,
131
98
#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
100
bool debug = false;
101
static const char *keydir = "/conf/conf.d/mandos";
139
102
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;
103
const char *argp_program_version = "mandosclient 0.9";
104
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
160
106
/* Used for passing in values through the Avahi callback functions */
108
AvahiSimplePoll *simple_poll;
162
109
AvahiServer *server;
163
110
gnutls_certificate_credentials_t cred;
164
111
unsigned int dh_bits;
165
112
gnutls_dh_params_t dh_params;
166
113
const char *priority;
168
server *current_server;
170
size_t interfaces_size;
171
114
} 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,
117
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
118
* "buffer_capacity" is how much is currently allocated,
201
119
* "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;
121
size_t adjustbuffer(char **buffer, size_t buffer_length,
122
size_t buffer_capacity){
123
if (buffer_length + BUFFER_SIZE > buffer_capacity){
124
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
216
128
buffer_capacity += BUFFER_SIZE;
218
130
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;
134
* Decrypt OpenPGP data using keyrings in HOMEDIR.
135
* 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,
137
static ssize_t pgp_packet_decrypt (const char *cryptotext,
140
const char *homedir){
141
gpgme_data_t dh_crypto, dh_plain;
277
143
gpgme_error_t rc;
145
size_t plaintext_capacity = 0;
146
ssize_t plaintext_length = 0;
278
147
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");
150
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
321
154
gpgme_check_version(NULL);
322
155
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));
156
if (rc != GPG_ERR_NO_ERROR){
157
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
158
gpgme_strsource(rc), gpgme_strerror(rc));
329
162
/* 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));
163
rc = gpgme_get_engine_info (&engine_info);
164
if (rc != GPG_ERR_NO_ERROR){
165
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
166
gpgme_strsource(rc), gpgme_strerror(rc));
336
169
while(engine_info != NULL){
337
170
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
338
171
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
339
engine_info->file_name, tempdir);
172
engine_info->file_name, homedir);
342
175
engine_info = engine_info->next;
344
177
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");
178
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
385
182
/* Create new GPGME data buffer from memory cryptotext */
386
183
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));
185
if (rc != GPG_ERR_NO_ERROR){
186
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
187
gpgme_strsource(rc), gpgme_strerror(rc));
394
191
/* Create new empty GPGME data buffer for the plaintext */
395
192
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));
193
if (rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
400
196
gpgme_data_release(dh_crypto);
200
/* Create new GPGME "context" */
201
rc = gpgme_new(&ctx);
202
if (rc != GPG_ERR_NO_ERROR){
203
fprintf(stderr, "bad gpgme_new: %s: %s\n",
204
gpgme_strsource(rc), gpgme_strerror(rc));
205
plaintext_length = -1;
404
209
/* 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));
211
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
212
if (rc != GPG_ERR_NO_ERROR){
213
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
214
gpgme_strsource(rc), gpgme_strerror(rc));
410
215
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;
220
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
224
gpgme_decrypt_result_t result;
225
result = gpgme_op_decrypt_result(ctx);
227
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
229
fprintf(stderr, "Unsupported algorithm: %s\n",
230
result->unsupported_algorithm);
231
fprintf(stderr, "Wrong key usage: %d\n",
232
result->wrong_key_usage);
233
if(result->file_name != NULL){
234
fprintf(stderr, "File name: %s\n", result->file_name);
236
gpgme_recipient_t recipient;
237
recipient = result->recipients;
426
239
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
240
fprintf(stderr, "Public key algorithm: %s\n",
241
gpgme_pubkey_algo_name(recipient->pubkey_algo));
242
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
243
fprintf(stderr, "Secret key available: %s\n",
244
recipient->status == GPG_ERR_NO_SECKEY
434
246
recipient = recipient->next;
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
445
252
/* 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");
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
448
255
plaintext_length = -1;
449
256
goto decrypt_end;
452
259
*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;
261
plaintext_capacity = adjustbuffer(plaintext,
262
(size_t)plaintext_length,
264
if (plaintext_capacity == 0){
265
perror("adjustbuffer");
266
plaintext_length = -1;
463
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
465
272
/* Print the data, if any */
471
perror_plus("gpgme_data_read");
278
perror("gpgme_data_read");
472
279
plaintext_length = -1;
473
280
goto decrypt_end;
475
282
plaintext_length += ret;
479
fprintf_plus(stderr, "Decrypted password is: ");
286
fprintf(stderr, "Decrypted password is: ");
480
287
for(ssize_t i = 0; i < plaintext_length; i++){
481
288
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
543
340
/* 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();
341
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n",
344
safer_gnutls_strerror(ret));
345
gnutls_global_deinit ();
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
350
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
351
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
559
355
ret = gnutls_certificate_set_openpgp_key_file
560
(mc->cred, pubkeyfilename, seckeyfilename,
561
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));
356
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
357
if (ret != GNUTLS_E_SUCCESS) {
359
"Error[%d] while reading the OpenPGP key pair ('%s',"
360
" '%s')\n", ret, pubkeyfile, seckeyfile);
361
fprintf(stdout, "The GnuTLS error is: %s\n",
362
safer_gnutls_strerror(ret));
571
366
/* GnuTLS server initialization */
572
367
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));
368
if (ret != GNUTLS_E_SUCCESS) {
369
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
370
" %s\n", safer_gnutls_strerror(ret));
373
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
374
if (ret != GNUTLS_E_SUCCESS) {
375
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
376
safer_gnutls_strerror(ret));
751
380
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
757
386
gnutls_certificate_free_credentials(mc->cred);
758
387
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,
392
static int init_gnutls_session(mandos_context *mc,
393
gnutls_session_t *session){
767
395
/* 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));
396
ret = gnutls_init(session, GNUTLS_SERVER);
397
if (ret != GNUTLS_E_SUCCESS){
398
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
399
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);
404
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
405
if (ret != GNUTLS_E_SUCCESS) {
406
fprintf(stderr, "Syntax error at: %s\n", err);
407
fprintf(stderr, "GnuTLS error: %s\n",
408
safer_gnutls_strerror(ret));
409
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);
414
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
416
if (ret != GNUTLS_E_SUCCESS) {
417
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
418
safer_gnutls_strerror(ret));
419
gnutls_deinit (*session);
813
423
/* ignore client certificate if any. */
814
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
424
gnutls_certificate_server_set_request (*session,
427
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
820
433
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
821
434
__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");
957
_exit(EX_UNAVAILABLE);
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
969
#pragma GCC diagnostic pop
971
perror_plus("fexecve");
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
991
if(kill(pid, SIGTERM) == -1){
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
1000
} while(pret == -1 and errno == EINTR);
1002
perror_plus("waitpid");
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1028
return add_delete_local_route(true, address, if_index);
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1037
return add_delete_local_route(false, address, if_index);
1040
436
/* Called when a Mandos server is found */
1041
__attribute__((nonnull, warn_unused_result))
1042
static int start_mandos_communication(const char *ip, in_port_t port,
437
static int start_mandos_communication(const char *ip, uint16_t port,
1043
438
AvahiIfIndex if_index,
1044
int af, mandos_context *mc){
1045
int ret, tcp_sd = -1;
1047
struct sockaddr_storage to;
441
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1048
442
char *buffer = NULL;
1049
char *decrypted_buffer = NULL;
443
char *decrypted_buffer;
1050
444
size_t buffer_length = 0;
1051
445
size_t buffer_capacity = 0;
446
ssize_t decrypted_buffer_size;
449
char interface[IF_NAMESIZE];
1054
450
gnutls_session_t session;
1055
int pf; /* Protocol family */
1056
bool route_added = false;
1073
fprintf_plus(stderr, "Bad address family: %d\n", af);
1078
/* If the interface is specified and we have a list of interfaces */
1079
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1080
/* Check if the interface is one of the interfaces we are using */
1083
char *interface = NULL;
1084
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
1093
/* This interface does not match any in the list, so we don't
1094
connect to the server */
1096
char interface[IF_NAMESIZE];
1097
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1098
perror_plus("if_indextoname");
1100
fprintf_plus(stderr, "Skipping server on non-used interface"
1102
if_indextoname((unsigned int)if_index,
452
ret = init_gnutls_session (mc, &session);
458
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
462
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
469
if(if_indextoname((unsigned int)if_index, interface) == NULL){
470
perror("if_indextoname");
473
fprintf(stderr, "Binding to interface %s\n", interface);
1110
ret = init_gnutls_session(&session, mc);
476
memset(&to,0,sizeof(to)); /* Spurious warning */
477
to.in6.sin6_family = AF_INET6;
478
/* It would be nice to have a way to detect if we were passed an
479
IPv4 address here. Now we assume an IPv6 address. */
480
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
1116
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1117
PRIuMAX "\n", ip, (uintmax_t)port);
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1123
perror_plus("socket");
1134
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1135
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to6->sin6_addr);
1138
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1139
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1140
ret = inet_pton(af, ip, &to4->sin_addr);
1144
perror_plus("inet_pton");
1150
fprintf_plus(stderr, "Bad address: %s\n", ip);
1155
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1156
if(IN6_IS_ADDR_LINKLOCAL
1157
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1158
if(if_index == AVAHI_IF_UNSPEC){
1159
fprintf_plus(stderr, "An IPv6 link-local address is"
1160
" incomplete without a network interface\n");
1164
/* Set the network interface number as scope */
1165
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1168
((struct sockaddr_in *)&to)->sin_port = htons(port);
486
fprintf(stderr, "Bad address: %s\n", ip);
489
to.in6.sin6_port = htons(port); /* Spurious warning */
491
to.in6.sin6_scope_id = (uint32_t)if_index;
1177
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1178
char interface[IF_NAMESIZE];
1179
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1180
perror_plus("if_indextoname");
1182
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1183
"\n", ip, interface, (uintmax_t)port);
1186
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1187
ip, (uintmax_t)port);
1189
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1190
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1192
ret = getnameinfo((struct sockaddr *)&to,
1193
sizeof(struct sockaddr_in6),
1194
addrstr, sizeof(addrstr), NULL, 0,
1197
ret = getnameinfo((struct sockaddr *)&to,
1198
sizeof(struct sockaddr_in),
1199
addrstr, sizeof(addrstr), NULL, 0,
1202
if(ret == EAI_SYSTEM){
1203
perror_plus("getnameinfo");
1204
} else if(ret != 0) {
1205
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1206
} else if(strcmp(addrstr, ip) != 0){
1207
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1218
ret = connect(tcp_sd, (struct sockaddr *)&to,
1219
sizeof(struct sockaddr_in6));
1221
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1222
sizeof(struct sockaddr_in));
1225
if(errno == ENETUNREACH
1226
and if_index != AVAHI_IF_UNSPEC
1227
and connect_to == NULL
1228
and not route_added and
1229
((af == AF_INET6 and not
1230
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1232
or (af == AF_INET and
1233
/* Not a a IPv4LL address */
1234
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1235
& 0xFFFF0000L) != 0xA9FE0000L))){
1236
/* Work around Avahi bug - Avahi does not announce link-local
1237
addresses if it has a global address, so local hosts with
1238
*only* a link-local address (e.g. Mandos clients) cannot
1239
connect to a Mandos server announced by Avahi on a server
1240
host with a global address. Work around this by retrying
1241
with an explicit route added with the server's address.
1243
Avahi bug reference:
1244
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1245
https://bugs.debian.org/587961
1248
fprintf_plus(stderr, "Mandos server unreachable, trying"
1252
route_added = add_local_route(ip, if_index);
1258
if(errno != ECONNREFUSED or debug){
1260
perror_plus("connect");
494
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
495
char addrstr[INET6_ADDRSTRLEN] = "";
496
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
497
sizeof(addrstr)) == NULL){
500
if(strcmp(addrstr, ip) != 0){
501
fprintf(stderr, "Canonical address form: %s\n", addrstr);
506
ret = connect(tcp_sd, &to.in, sizeof(to));
1273
512
const char *out = mandos_protocol_version;
1276
515
size_t out_size = strlen(out);
1277
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1278
out_size - written));
1281
perror_plus("write");
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
517
out_size - written));
1283
521
goto mandos_end;
1285
523
written += (size_t)ret;
1286
524
if(written < out_size){
1289
if(out == mandos_protocol_version){
527
if (out == mandos_protocol_version){
1304
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1312
/* This casting via intptr_t is to eliminate warning about casting
1313
an int to a pointer type. This is exactly how the GnuTLS Guile
1314
function "set-session-transport-fd!" does it. */
1315
gnutls_transport_set_ptr(session,
1316
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1324
ret = gnutls_handshake(session);
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
543
ret = gnutls_handshake (session);
1329
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1331
if(ret != GNUTLS_E_SUCCESS){
546
if (ret != GNUTLS_E_SUCCESS){
1333
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1337
552
goto mandos_end;
1340
555
/* Read OpenPGP packet that contains the wanted password */
1343
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
1354
buffer_capacity = incbuffer(&buffer, buffer_length,
1356
if(buffer_capacity == 0){
1358
perror_plus("incbuffer");
1368
sret = gnutls_record_recv(session, buffer+buffer_length,
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
565
if (buffer_capacity == 0){
566
perror("adjustbuffer");
571
ret = gnutls_record_recv(session, buffer+buffer_length,
1375
578
case GNUTLS_E_INTERRUPTED:
1376
579
case GNUTLS_E_AGAIN:
1378
581
case GNUTLS_E_REHANDSHAKE:
1380
ret = gnutls_handshake(session);
583
ret = gnutls_handshake (session);
1386
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1388
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1392
589
goto mandos_end;
1396
fprintf_plus(stderr, "Unknown error while reading data from"
1397
" encrypted session with Mandos server\n");
1398
gnutls_bye(session, GNUTLS_SHUT_RDWR);
593
fprintf(stderr, "Unknown error while reading data from"
594
" encrypted session with Mandos server\n");
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
1400
597
goto mandos_end;
1403
buffer_length += (size_t) sret;
600
buffer_length += (size_t) ret;
1408
fprintf_plus(stderr, "Closing TLS session\n");
1417
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1422
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1424
if(buffer_length > 0){
1425
ssize_t decrypted_buffer_size;
1426
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1427
&decrypted_buffer, mc);
1428
if(decrypted_buffer_size >= 0){
605
fprintf(stderr, "Closing TLS session\n");
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
610
if (buffer_length > 0){
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
615
if (decrypted_buffer_size >= 0){
1431
617
while(written < (size_t) decrypted_buffer_size){
1437
ret = (int)fwrite(decrypted_buffer + written, 1,
1438
(size_t)decrypted_buffer_size - written,
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
1440
621
if(ret == 0 and ferror(stdout)){
1443
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
623
fprintf(stderr, "Error writing encrypted data: %s\n",
1449
629
written += (size_t)ret;
631
free(decrypted_buffer);
1455
637
/* Shutdown procedure */
1460
if(not delete_local_route(ip, if_index)){
1461
fprintf_plus(stderr, "Failed to delete local route to %s on"
1462
" interface %d", ip, if_index);
1466
free(decrypted_buffer);
1469
ret = close(tcp_sd);
1475
perror_plus("close");
1477
gnutls_deinit(session);
642
gnutls_deinit (session);
1487
__attribute__((nonnull))
1488
646
static void resolve_callback(AvahiSServiceResolver *r,
1489
647
AvahiIfIndex interface,
1490
AvahiProtocol proto,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1491
649
AvahiResolverEvent event,
1492
650
const char *name,
1493
651
const char *type,
1602
733
case AVAHI_BROWSER_ALL_FOR_NOW:
1603
734
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1605
fprintf_plus(stderr, "No Mandos server found, still"
736
fprintf(stderr, "No Mandos server found, still searching...\n");
1612
/* Signal handler that stops main loop after SIGTERM */
1613
static void handle_sigterm(int sig){
1618
signal_received = sig;
1619
int old_errno = errno;
1620
/* set main loop to exit */
1621
if(simple_poll != NULL){
1622
avahi_simple_poll_quit(simple_poll);
1627
__attribute__((nonnull, warn_unused_result))
1628
bool get_flags(const char *ifname, struct ifreq *ifr){
1632
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1635
perror_plus("socket");
1639
strcpy(ifr->ifr_name, ifname);
1640
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1644
perror_plus("ioctl SIOCGIFFLAGS");
1652
__attribute__((nonnull, warn_unused_result))
1653
bool good_flags(const char *ifname, const struct ifreq *ifr){
1655
/* Reject the loopback device */
1656
if(ifr->ifr_flags & IFF_LOOPBACK){
1658
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1663
/* Accept point-to-point devices only if connect_to is specified */
1664
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1666
fprintf_plus(stderr, "Accepting point-to-point interface"
1667
" \"%s\"\n", ifname);
1671
/* Otherwise, reject non-broadcast-capable devices */
1672
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1674
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1675
" \"%s\"\n", ifname);
1679
/* Reject non-ARP interfaces (including dummy interfaces) */
1680
if(ifr->ifr_flags & IFF_NOARP){
1682
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1688
/* Accept this device */
1690
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1696
* This function determines if a directory entry in /sys/class/net
1697
* corresponds to an acceptable network device.
1698
* (This function is passed to scandir(3) as a filter function.)
1700
__attribute__((nonnull, warn_unused_result))
1701
int good_interface(const struct dirent *if_entry){
1702
if(if_entry->d_name[0] == '.'){
1707
if(not get_flags(if_entry->d_name, &ifr)){
1709
fprintf_plus(stderr, "Failed to get flags for interface "
1710
"\"%s\"\n", if_entry->d_name);
1715
if(not good_flags(if_entry->d_name, &ifr)){
1722
* This function determines if a network interface is up.
1724
__attribute__((nonnull, warn_unused_result))
1725
bool interface_is_up(const char *interface){
1727
if(not get_flags(interface, &ifr)){
1729
fprintf_plus(stderr, "Failed to get flags for interface "
1730
"\"%s\"\n", interface);
1735
return (bool)(ifr.ifr_flags & IFF_UP);
1739
* This function determines if a network interface is running
1741
__attribute__((nonnull, warn_unused_result))
1742
bool interface_is_running(const char *interface){
1744
if(not get_flags(interface, &ifr)){
1746
fprintf_plus(stderr, "Failed to get flags for interface "
1747
"\"%s\"\n", interface);
1752
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1755
__attribute__((nonnull, pure, warn_unused_result))
1756
int notdotentries(const struct dirent *direntry){
1757
/* Skip "." and ".." */
1758
if(direntry->d_name[0] == '.'
1759
and (direntry->d_name[1] == '\0'
1760
or (direntry->d_name[1] == '.'
1761
and direntry->d_name[2] == '\0'))){
1767
/* Is this directory entry a runnable program? */
1768
__attribute__((nonnull, warn_unused_result))
1769
int runnable_hook(const struct dirent *direntry){
1774
if((direntry->d_name)[0] == '\0'){
1779
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1780
"abcdefghijklmnopqrstuvwxyz"
1783
if((direntry->d_name)[sret] != '\0'){
1784
/* Contains non-allowed characters */
1786
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1792
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1795
perror_plus("Could not stat hook");
1799
if(not (S_ISREG(st.st_mode))){
1800
/* Not a regular file */
1802
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1807
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1808
/* Not executable */
1810
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1816
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1822
__attribute__((nonnull, warn_unused_result))
1823
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1824
mandos_context *mc){
1826
struct timespec now;
1827
struct timespec waited_time;
1828
intmax_t block_time;
1831
if(mc->current_server == NULL){
1833
fprintf_plus(stderr, "Wait until first server is found."
1836
ret = avahi_simple_poll_iterate(s, -1);
1839
fprintf_plus(stderr, "Check current_server if we should run"
1842
/* the current time */
1843
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1845
perror_plus("clock_gettime");
1848
/* Calculating in ms how long time between now and server
1849
who we visted longest time ago. Now - last seen. */
1850
waited_time.tv_sec = (now.tv_sec
1851
- mc->current_server->last_seen.tv_sec);
1852
waited_time.tv_nsec = (now.tv_nsec
1853
- mc->current_server->last_seen.tv_nsec);
1854
/* total time is 10s/10,000ms.
1855
Converting to s from ms by dividing by 1,000,
1856
and ns to ms by dividing by 1,000,000. */
1857
block_time = ((retry_interval
1858
- ((intmax_t)waited_time.tv_sec * 1000))
1859
- ((intmax_t)waited_time.tv_nsec / 1000000));
1862
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1866
if(block_time <= 0){
1867
ret = start_mandos_communication(mc->current_server->ip,
1868
mc->current_server->port,
1869
mc->current_server->if_index,
1870
mc->current_server->af, mc);
1872
avahi_simple_poll_quit(s);
1875
ret = clock_gettime(CLOCK_MONOTONIC,
1876
&mc->current_server->last_seen);
1878
perror_plus("clock_gettime");
1881
mc->current_server = mc->current_server->next;
1882
block_time = 0; /* Call avahi to find new Mandos
1883
servers, but don't block */
1886
ret = avahi_simple_poll_iterate(s, (int)block_time);
1889
if(ret > 0 or errno != EINTR){
1890
return (ret != 1) ? ret : 0;
1896
__attribute__((nonnull))
1897
void run_network_hooks(const char *mode, const char *interface,
1899
struct dirent **direntries = NULL;
1900
if(hookdir_fd == -1){
1901
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1903
if(hookdir_fd == -1){
1904
if(errno == ENOENT){
1906
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1907
" found\n", hookdir);
1910
perror_plus("open");
1916
#if __GLIBC_PREREQ(2, 15)
1917
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1918
runnable_hook, alphasort);
1919
#else /* not __GLIBC_PREREQ(2, 15) */
1920
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1922
#endif /* not __GLIBC_PREREQ(2, 15) */
1923
#else /* not __GLIBC__ */
1924
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1926
#endif /* not __GLIBC__ */
1928
perror_plus("scandir");
1931
struct dirent *direntry;
1933
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1935
perror_plus("open(\"/dev/null\", O_RDONLY)");
1938
for(int i = 0; i < numhooks; i++){
1939
direntry = direntries[i];
1941
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1944
pid_t hook_pid = fork();
1947
/* Raise privileges */
1948
errno = raise_privileges_permanently();
1950
perror_plus("Failed to raise privileges");
1957
perror_plus("setgid");
1960
/* Reset supplementary groups */
1962
ret = setgroups(0, NULL);
1964
perror_plus("setgroups");
1967
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1969
perror_plus("setenv");
1972
ret = setenv("DEVICE", interface, 1);
1974
perror_plus("setenv");
1977
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1979
perror_plus("setenv");
1982
ret = setenv("MODE", mode, 1);
1984
perror_plus("setenv");
1988
ret = asprintf(&delaystring, "%f", (double)delay);
1990
perror_plus("asprintf");
1993
ret = setenv("DELAY", delaystring, 1);
1996
perror_plus("setenv");
2000
if(connect_to != NULL){
2001
ret = setenv("CONNECT", connect_to, 1);
2003
perror_plus("setenv");
2007
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2011
perror_plus("openat");
2012
_exit(EXIT_FAILURE);
2014
if(close(hookdir_fd) == -1){
2015
perror_plus("close");
2016
_exit(EXIT_FAILURE);
2018
ret = dup2(devnull, STDIN_FILENO);
2020
perror_plus("dup2(devnull, STDIN_FILENO)");
2023
ret = close(devnull);
2025
perror_plus("close");
2028
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2030
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2033
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2035
perror_plus("fexecve");
2036
_exit(EXIT_FAILURE);
2040
perror_plus("fork");
2045
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2046
perror_plus("waitpid");
2050
if(WIFEXITED(status)){
2051
if(WEXITSTATUS(status) != 0){
2052
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2053
" with status %d\n", direntry->d_name,
2054
WEXITSTATUS(status));
2058
} else if(WIFSIGNALED(status)){
2059
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2060
" signal %d\n", direntry->d_name,
2065
fprintf_plus(stderr, "Warning: network hook \"%s\""
2066
" crashed\n", direntry->d_name);
2072
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2078
if(close(hookdir_fd) == -1){
2079
perror_plus("close");
2086
__attribute__((nonnull, warn_unused_result))
2087
error_t bring_up_interface(const char *const interface,
2089
error_t old_errno = errno;
2091
struct ifreq network;
2092
unsigned int if_index = if_nametoindex(interface);
2094
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2104
if(not interface_is_up(interface)){
2105
error_t ret_errno = 0, ioctl_errno = 0;
2106
if(not get_flags(interface, &network)){
2108
fprintf_plus(stderr, "Failed to get flags for interface "
2109
"\"%s\"\n", interface);
2113
network.ifr_flags |= IFF_UP; /* set flag */
2115
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2118
perror_plus("socket");
2126
perror_plus("close");
2133
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2137
/* Raise privileges */
2138
ret_errno = raise_privileges();
2141
perror_plus("Failed to raise privileges");
2146
bool restore_loglevel = false;
2148
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2149
messages about the network interface to mess up the prompt */
2150
ret_linux = klogctl(8, NULL, 5);
2151
if(ret_linux == -1){
2152
perror_plus("klogctl");
2154
restore_loglevel = true;
2157
#endif /* __linux__ */
2158
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2159
ioctl_errno = errno;
2161
if(restore_loglevel){
2162
ret_linux = klogctl(7, NULL, 0);
2163
if(ret_linux == -1){
2164
perror_plus("klogctl");
2167
#endif /* __linux__ */
2169
/* If raise_privileges() succeeded above */
2171
/* Lower privileges */
2172
ret_errno = lower_privileges();
2175
perror_plus("Failed to lower privileges");
2179
/* Close the socket */
2182
perror_plus("close");
2185
if(ret_setflags == -1){
2186
errno = ioctl_errno;
2187
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2192
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2196
/* Sleep checking until interface is running.
2197
Check every 0.25s, up to total time of delay */
2198
for(int i=0; i < delay * 4; i++){
2199
if(interface_is_running(interface)){
2202
struct timespec sleeptime = { .tv_nsec = 250000000 };
2203
ret = nanosleep(&sleeptime, NULL);
2204
if(ret == -1 and errno != EINTR){
2205
perror_plus("nanosleep");
2213
__attribute__((nonnull, warn_unused_result))
2214
error_t take_down_interface(const char *const interface){
2215
error_t old_errno = errno;
2216
struct ifreq network;
2217
unsigned int if_index = if_nametoindex(interface);
2219
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2223
if(interface_is_up(interface)){
2224
error_t ret_errno = 0, ioctl_errno = 0;
2225
if(not get_flags(interface, &network) and debug){
2227
fprintf_plus(stderr, "Failed to get flags for interface "
2228
"\"%s\"\n", interface);
2232
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2234
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2237
perror_plus("socket");
2243
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2247
/* Raise privileges */
2248
ret_errno = raise_privileges();
2251
perror_plus("Failed to raise privileges");
2254
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2255
ioctl_errno = errno;
2257
/* If raise_privileges() succeeded above */
2259
/* Lower privileges */
2260
ret_errno = lower_privileges();
2263
perror_plus("Failed to lower privileges");
2267
/* Close the socket */
2268
int ret = close(sd);
2270
perror_plus("close");
2273
if(ret_setflags == -1){
2274
errno = ioctl_errno;
2275
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2280
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
742
/* Combines file name and path and returns the malloced new
743
string. some sane checks could/should be added */
744
static const char *combinepath(const char *first, const char *second){
745
size_t f_len = strlen(first);
746
size_t s_len = strlen(second);
747
char *tmp = malloc(f_len + s_len + 2);
752
memcpy(tmp, first, f_len); /* Spurious warning */
756
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
758
tmp[f_len + 1 + s_len] = '\0';
2288
763
int main(int argc, char *argv[]){
2289
mandos_context mc = { .server = NULL, .dh_bits = 0,
2290
.priority = "SECURE256:!CTYPE-X.509:"
2291
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2292
.interfaces = NULL, .interfaces_size = 0 };
2293
AvahiSServiceBrowser *sb = NULL;
2298
int exitcode = EXIT_SUCCESS;
2299
char *interfaces_to_take_down = NULL;
2300
size_t interfaces_to_take_down_size = 0;
2301
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2302
char old_tempdir[] = "/tmp/mandosXXXXXX";
2303
char *tempdir = NULL;
2304
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2305
const char *seckey = PATHDIR "/" SECKEY;
2306
const char *pubkey = PATHDIR "/" PUBKEY;
2307
const char *dh_params_file = NULL;
2308
char *interfaces_hooks = NULL;
2310
bool gnutls_initialized = false;
2311
bool gpgme_initialized = false;
2313
double retry_interval = 10; /* 10s between trying a server and
2314
retrying the same server again */
2316
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2317
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2322
/* Lower any group privileges we might have, just to be safe */
2326
perror_plus("setgid");
2329
/* Lower user privileges (temporarily) */
2333
perror_plus("seteuid");
2341
struct argp_option options[] = {
2342
{ .name = "debug", .key = 128,
2343
.doc = "Debug mode", .group = 3 },
2344
{ .name = "connect", .key = 'c',
2345
.arg = "ADDRESS:PORT",
2346
.doc = "Connect directly to a specific Mandos server",
2348
{ .name = "interface", .key = 'i',
2350
.doc = "Network interface that will be used to search for"
2353
{ .name = "seckey", .key = 's',
2355
.doc = "OpenPGP secret key file base name",
2357
{ .name = "pubkey", .key = 'p',
2359
.doc = "OpenPGP public key file base name",
2361
{ .name = "dh-bits", .key = 129,
2363
.doc = "Bit length of the prime number used in the"
2364
" Diffie-Hellman key exchange",
2366
{ .name = "dh-params", .key = 134,
2368
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2369
" for the Diffie-Hellman key exchange",
2371
{ .name = "priority", .key = 130,
2373
.doc = "GnuTLS priority string for the TLS handshake",
2375
{ .name = "delay", .key = 131,
2377
.doc = "Maximum delay to wait for interface startup",
2379
{ .name = "retry", .key = 132,
2381
.doc = "Retry interval used when denied by the Mandos server",
2383
{ .name = "network-hook-dir", .key = 133,
2385
.doc = "Directory where network hooks are located",
2388
* These reproduce what we would get without ARGP_NO_HELP
2390
{ .name = "help", .key = '?',
2391
.doc = "Give this help list", .group = -1 },
2392
{ .name = "usage", .key = -3,
2393
.doc = "Give a short usage message", .group = -1 },
2394
{ .name = "version", .key = 'V',
2395
.doc = "Print program version", .group = -1 },
2399
error_t parse_opt(int key, char *arg,
2400
struct argp_state *state){
2403
case 128: /* --debug */
2406
case 'c': /* --connect */
2409
case 'i': /* --interface */
2410
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2413
argp_error(state, "%s", strerror(ret_errno));
2416
case 's': /* --seckey */
2419
case 'p': /* --pubkey */
2422
case 129: /* --dh-bits */
2424
tmpmax = strtoimax(arg, &tmp, 10);
2425
if(errno != 0 or tmp == arg or *tmp != '\0'
2426
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2427
argp_error(state, "Bad number of DH bits");
2429
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2431
case 134: /* --dh-params */
2432
dh_params_file = arg;
2434
case 130: /* --priority */
2437
case 131: /* --delay */
2439
delay = strtof(arg, &tmp);
2440
if(errno != 0 or tmp == arg or *tmp != '\0'){
2441
argp_error(state, "Bad delay");
2443
case 132: /* --retry */
2445
retry_interval = strtod(arg, &tmp);
2446
if(errno != 0 or tmp == arg or *tmp != '\0'
2447
or (retry_interval * 1000) > INT_MAX
2448
or retry_interval < 0){
2449
argp_error(state, "Bad retry interval");
2452
case 133: /* --network-hook-dir */
2456
* These reproduce what we would get without ARGP_NO_HELP
2458
case '?': /* --help */
2459
argp_state_help(state, state->out_stream,
2460
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2461
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2462
case -3: /* --usage */
2463
argp_state_help(state, state->out_stream,
2464
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2465
case 'V': /* --version */
2466
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2467
exit(argp_err_exit_status);
2470
return ARGP_ERR_UNKNOWN;
2475
struct argp argp = { .options = options, .parser = parse_opt,
2477
.doc = "Mandos client -- Get and decrypt"
2478
" passwords from a Mandos server" };
2479
ret = argp_parse(&argp, argc, argv,
2480
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2487
perror_plus("argp_parse");
2488
exitcode = EX_OSERR;
2491
exitcode = EX_USAGE;
2497
/* Work around Debian bug #633582:
2498
<http://bugs.debian.org/633582> */
2500
/* Re-raise privileges */
2501
ret_errno = raise_privileges();
2504
perror_plus("Failed to raise privileges");
2508
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2509
int seckey_fd = open(seckey, O_RDONLY);
2510
if(seckey_fd == -1){
2511
perror_plus("open");
2513
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2515
perror_plus("fstat");
2517
if(S_ISREG(st.st_mode)
2518
and st.st_uid == 0 and st.st_gid == 0){
2519
ret = fchown(seckey_fd, uid, gid);
2521
perror_plus("fchown");
2529
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2530
int pubkey_fd = open(pubkey, O_RDONLY);
2531
if(pubkey_fd == -1){
2532
perror_plus("open");
2534
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2536
perror_plus("fstat");
2538
if(S_ISREG(st.st_mode)
2539
and st.st_uid == 0 and st.st_gid == 0){
2540
ret = fchown(pubkey_fd, uid, gid);
2542
perror_plus("fchown");
2550
if(strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2551
int dhparams_fd = open(dh_params_file, O_RDONLY);
2552
if(dhparams_fd == -1){
2553
perror_plus("open");
2555
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2557
perror_plus("fstat");
2559
if(S_ISREG(st.st_mode)
2560
and st.st_uid == 0 and st.st_gid == 0){
2561
ret = fchown(dhparams_fd, uid, gid);
2563
perror_plus("fchown");
2571
/* Lower privileges */
2572
ret_errno = lower_privileges();
2575
perror_plus("Failed to lower privileges");
2580
/* Remove invalid interface names (except "none") */
2582
char *interface = NULL;
2583
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2585
if(strcmp(interface, "none") != 0
2586
and if_nametoindex(interface) == 0){
2587
if(interface[0] != '\0'){
2588
fprintf_plus(stderr, "Not using nonexisting interface"
2589
" \"%s\"\n", interface);
2591
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2597
/* Run network hooks */
2599
if(mc.interfaces != NULL){
2600
interfaces_hooks = malloc(mc.interfaces_size);
2601
if(interfaces_hooks == NULL){
2602
perror_plus("malloc");
764
AvahiSServiceBrowser *sb = NULL;
767
int exitcode = EXIT_SUCCESS;
768
const char *interface = "eth0";
769
struct ifreq network;
773
char *connect_to = NULL;
774
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
775
const char *pubkeyfile = "pubkey.txt";
776
const char *seckeyfile = "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);
856
return ARGP_ERR_UNKNOWN;
861
struct argp argp = { .options = options, .parser = parse_opt,
863
.doc = "Mandos client -- Get and decrypt"
864
" passwords from mandos server" };
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
867
fprintf(stderr, "Unkown error while parsing arguments\n");
868
exitcode = EXIT_FAILURE;
2605
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2606
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2608
run_network_hooks("start", interfaces_hooks != NULL ?
2609
interfaces_hooks : "", delay);
2613
avahi_set_log_function(empty_log);
2616
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2617
from the signal handler */
2618
/* Initialize the pseudo-RNG for Avahi */
2619
srand((unsigned int) time(NULL));
2620
simple_poll = avahi_simple_poll_new();
2621
if(simple_poll == NULL){
2622
fprintf_plus(stderr,
2623
"Avahi: Failed to create simple poll object.\n");
2624
exitcode = EX_UNAVAILABLE;
2628
sigemptyset(&sigterm_action.sa_mask);
2629
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2631
perror_plus("sigaddset");
2632
exitcode = EX_OSERR;
2635
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2637
perror_plus("sigaddset");
2638
exitcode = EX_OSERR;
2641
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2643
perror_plus("sigaddset");
2644
exitcode = EX_OSERR;
2647
/* Need to check if the handler is SIG_IGN before handling:
2648
| [[info:libc:Initial Signal Actions]] |
2649
| [[info:libc:Basic Signal Handling]] |
2651
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2653
perror_plus("sigaction");
2656
if(old_sigterm_action.sa_handler != SIG_IGN){
2657
ret = sigaction(SIGINT, &sigterm_action, NULL);
2659
perror_plus("sigaction");
2660
exitcode = EX_OSERR;
2664
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2666
perror_plus("sigaction");
2669
if(old_sigterm_action.sa_handler != SIG_IGN){
2670
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2672
perror_plus("sigaction");
2673
exitcode = EX_OSERR;
2677
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2679
perror_plus("sigaction");
2682
if(old_sigterm_action.sa_handler != SIG_IGN){
2683
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2685
perror_plus("sigaction");
2686
exitcode = EX_OSERR;
2691
/* If no interfaces were specified, make a list */
2692
if(mc.interfaces == NULL){
2693
struct dirent **direntries = NULL;
2694
/* Look for any good interfaces */
2695
ret = scandir(sys_class_net, &direntries, good_interface,
2698
/* Add all found interfaces to interfaces list */
2699
for(int i = 0; i < ret; ++i){
2700
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2701
direntries[i]->d_name);
2704
perror_plus("argz_add");
2705
free(direntries[i]);
2709
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2710
direntries[i]->d_name);
2712
free(direntries[i]);
2719
fprintf_plus(stderr, "Could not find a network interface\n");
873
pubkeyfile = combinepath(keydir, pubkeyfile);
874
if (pubkeyfile == NULL){
875
perror("combinepath");
2720
876
exitcode = EXIT_FAILURE;
2725
/* Bring up interfaces which are down, and remove any "none"s */
2727
char *interface = NULL;
2728
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2730
/* If interface name is "none", stop bringing up interfaces.
2731
Also remove all instances of "none" from the list */
2732
if(strcmp(interface, "none") == 0){
2733
argz_delete(&mc.interfaces, &mc.interfaces_size,
2736
while((interface = argz_next(mc.interfaces,
2737
mc.interfaces_size, interface))){
2738
if(strcmp(interface, "none") == 0){
2739
argz_delete(&mc.interfaces, &mc.interfaces_size,
2746
bool interface_was_up = interface_is_up(interface);
2747
errno = bring_up_interface(interface, delay);
2748
if(not interface_was_up){
2750
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2751
" %s\n", interface, strerror(errno));
2753
errno = argz_add(&interfaces_to_take_down,
2754
&interfaces_to_take_down_size,
2757
perror_plus("argz_add");
2762
if(debug and (interfaces_to_take_down == NULL)){
2763
fprintf_plus(stderr, "No interfaces were brought up\n");
2767
/* If we only got one interface, explicitly use only that one */
2768
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2770
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2773
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2780
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2782
fprintf_plus(stderr, "init_gnutls_global failed\n");
2783
exitcode = EX_UNAVAILABLE;
2786
gnutls_initialized = true;
2793
/* Try /run/tmp before /tmp */
2794
tempdir = mkdtemp(run_tempdir);
2795
if(tempdir == NULL and errno == ENOENT){
2797
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2798
run_tempdir, old_tempdir);
2800
tempdir = mkdtemp(old_tempdir);
2802
if(tempdir == NULL){
2803
perror_plus("mkdtemp");
2811
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2812
fprintf_plus(stderr, "init_gpgme failed\n");
2813
exitcode = EX_UNAVAILABLE;
2816
gpgme_initialized = true;
2823
if(connect_to != NULL){
2824
/* Connect directly, do not use Zeroconf */
2825
/* (Mainly meant for debugging) */
2826
char *address = strrchr(connect_to, ':');
2828
if(address == NULL){
2829
fprintf_plus(stderr, "No colon in address\n");
2830
exitcode = EX_USAGE;
2840
tmpmax = strtoimax(address+1, &tmp, 10);
2841
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2842
or tmpmax != (in_port_t)tmpmax){
2843
fprintf_plus(stderr, "Bad port number\n");
2844
exitcode = EX_USAGE;
2852
port = (in_port_t)tmpmax;
2854
/* Colon in address indicates IPv6 */
2856
if(strchr(connect_to, ':') != NULL){
2858
/* Accept [] around IPv6 address - see RFC 5952 */
2859
if(connect_to[0] == '[' and address[-1] == ']')
880
seckeyfile = combinepath(keydir, seckeyfile);
881
if (seckeyfile == NULL){
882
perror("combinepath");
886
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
888
fprintf(stderr, "init_gnutls_global\n");
2867
address = connect_to;
891
gnutls_initalized = true;
907
if_index = (AvahiIfIndex) if_nametoindex(interface);
909
fprintf(stderr, "No such interface: \"%s\"\n", interface);
913
if(connect_to != NULL){
914
/* Connect directly, do not use Zeroconf */
915
/* (Mainly meant for debugging) */
916
char *address = strrchr(connect_to, ':');
918
fprintf(stderr, "No colon in address\n");
919
exitcode = EXIT_FAILURE;
923
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
925
perror("Bad port number");
926
exitcode = EXIT_FAILURE;
930
address = connect_to;
931
ret = start_mandos_communication(address, port, if_index, &mc);
933
exitcode = EXIT_FAILURE;
935
exitcode = EXIT_SUCCESS;
2873
while(not quit_now){
2874
ret = start_mandos_communication(address, port, if_index, af,
2876
if(quit_now or ret == 0){
2880
fprintf_plus(stderr, "Retrying in %d seconds\n",
2881
(int)retry_interval);
2883
sleep((unsigned int)retry_interval);
2887
exitcode = EXIT_SUCCESS;
2898
AvahiServerConfig config;
2899
/* Do not publish any local Zeroconf records */
2900
avahi_server_config_init(&config);
2901
config.publish_hinfo = 0;
2902
config.publish_addresses = 0;
2903
config.publish_workstation = 0;
2904
config.publish_domain = 0;
2906
/* Allocate a new server */
2907
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2908
&config, NULL, NULL, &ret_errno);
2910
/* Free the Avahi configuration data */
2911
avahi_server_config_free(&config);
2914
/* Check if creating the Avahi server object succeeded */
2915
if(mc.server == NULL){
2916
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2917
avahi_strerror(ret_errno));
2918
exitcode = EX_UNAVAILABLE;
2926
/* Create the Avahi service browser */
2927
sb = avahi_s_service_browser_new(mc.server, if_index,
2928
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2929
NULL, 0, browse_callback,
2932
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2933
avahi_strerror(avahi_server_errno(mc.server)));
2934
exitcode = EX_UNAVAILABLE;
2942
/* Run the main loop */
2945
fprintf_plus(stderr, "Starting Avahi loop search\n");
2948
ret = avahi_loop_with_timeout(simple_poll,
2949
(int)(retry_interval * 1000), &mc);
2951
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2952
(ret == 0) ? "successfully" : "with error");
940
/* If the interface is down, bring it up */
942
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
945
exitcode = EXIT_FAILURE;
948
strcpy(network.ifr_name, interface); /* Spurious warning */
949
ret = ioctl(sd, SIOCGIFFLAGS, &network);
951
perror("ioctl SIOCGIFFLAGS");
952
exitcode = EXIT_FAILURE;
955
if((network.ifr_flags & IFF_UP) == 0){
956
network.ifr_flags |= IFF_UP;
957
ret = ioctl(sd, SIOCSIFFLAGS, &network);
959
perror("ioctl SIOCSIFFLAGS");
960
exitcode = EXIT_FAILURE;
968
avahi_set_log_function(empty_log);
971
/* Initialize the pseudo-RNG for Avahi */
972
srand((unsigned int) time(NULL));
974
/* Allocate main Avahi loop object */
975
mc.simple_poll = avahi_simple_poll_new();
976
if (mc.simple_poll == NULL) {
977
fprintf(stderr, "Avahi: Failed to create simple poll"
979
exitcode = EXIT_FAILURE;
984
AvahiServerConfig config;
985
/* Do not publish any local Zeroconf records */
986
avahi_server_config_init(&config);
987
config.publish_hinfo = 0;
988
config.publish_addresses = 0;
989
config.publish_workstation = 0;
990
config.publish_domain = 0;
992
/* Allocate a new server */
993
mc.server = avahi_server_new(avahi_simple_poll_get
994
(mc.simple_poll), &config, NULL,
997
/* Free the Avahi configuration data */
998
avahi_server_config_free(&config);
1001
/* Check if creating the Avahi server object succeeded */
1002
if (mc.server == NULL) {
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1004
avahi_strerror(error));
1005
exitcode = EXIT_FAILURE;
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
1012
"_mandos._tcp", NULL, 0,
1013
browse_callback, &mc);
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1021
/* Run the main loop */
1024
fprintf(stderr, "Starting Avahi loop search\n");
1027
avahi_simple_poll_loop(mc.simple_poll);
2958
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2961
/* Cleanup things */
2962
free(mc.interfaces);
2965
avahi_s_service_browser_free(sb);
2967
if(mc.server != NULL)
2968
avahi_server_free(mc.server);
2970
if(simple_poll != NULL)
2971
avahi_simple_poll_free(simple_poll);
2973
if(gnutls_initialized){
2974
gnutls_certificate_free_credentials(mc.cred);
2975
gnutls_global_deinit();
2976
gnutls_dh_params_deinit(mc.dh_params);
2979
if(gpgme_initialized){
2980
gpgme_release(mc.ctx);
2983
/* Cleans up the circular linked list of Mandos servers the client
2985
if(mc.current_server != NULL){
2986
mc.current_server->prev->next = NULL;
2987
while(mc.current_server != NULL){
2988
server *next = mc.current_server->next;
2990
#pragma GCC diagnostic push
2991
#pragma GCC diagnostic ignored "-Wcast-qual"
2993
free((char *)(mc.current_server->ip));
2995
#pragma GCC diagnostic pop
2997
free(mc.current_server);
2998
mc.current_server = next;
3002
/* Re-raise privileges */
3004
ret_errno = raise_privileges();
3007
perror_plus("Failed to raise privileges");
3010
/* Run network hooks */
3011
run_network_hooks("stop", interfaces_hooks != NULL ?
3012
interfaces_hooks : "", delay);
3014
/* Take down the network interfaces which were brought up */
3016
char *interface = NULL;
3017
while((interface=argz_next(interfaces_to_take_down,
3018
interfaces_to_take_down_size,
3020
ret_errno = take_down_interface(interface);
3023
perror_plus("Failed to take down interface");
3026
if(debug and (interfaces_to_take_down == NULL)){
3027
fprintf_plus(stderr, "No interfaces needed to be taken"
3033
ret_errno = lower_privileges_permanently();
3036
perror_plus("Failed to lower privileges permanently");
3040
free(interfaces_to_take_down);
3041
free(interfaces_hooks);
3043
/* Removes the GPGME temp directory and all files inside */
3044
if(tempdir != NULL){
3045
struct dirent **direntries = NULL;
3046
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3050
if(tempdir_fd == -1){
3051
perror_plus("open");
3054
#if __GLIBC_PREREQ(2, 15)
3055
int numentries = scandirat(tempdir_fd, ".", &direntries,
3056
notdotentries, alphasort);
3057
#else /* not __GLIBC_PREREQ(2, 15) */
3058
int numentries = scandir(tempdir, &direntries, notdotentries,
3060
#endif /* not __GLIBC_PREREQ(2, 15) */
3061
#else /* not __GLIBC__ */
3062
int numentries = scandir(tempdir, &direntries, notdotentries,
3064
#endif /* not __GLIBC__ */
3065
if(numentries >= 0){
3066
for(int i = 0; i < numentries; i++){
3067
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3069
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3070
" \"%s\", 0): %s\n", tempdir,
3071
direntries[i]->d_name, strerror(errno));
3073
free(direntries[i]);
3076
/* need to clean even if 0 because man page doesn't specify */
3078
if(numentries == -1){
3079
perror_plus("scandir");
3081
ret = rmdir(tempdir);
3082
if(ret == -1 and errno != ENOENT){
3083
perror_plus("rmdir");
3091
sigemptyset(&old_sigterm_action.sa_mask);
3092
old_sigterm_action.sa_handler = SIG_DFL;
3093
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3094
&old_sigterm_action,
3097
perror_plus("sigaction");
3100
ret = raise(signal_received);
3101
} while(ret != 0 and errno == EINTR);
3103
perror_plus("raise");
3106
TEMP_FAILURE_RETRY(pause());
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1035
/* Cleanup things */
1037
avahi_s_service_browser_free(sb);
1039
if (mc.server != NULL)
1040
avahi_server_free(mc.server);
1042
if (mc.simple_poll != NULL)
1043
avahi_simple_poll_free(mc.simple_poll);
1047
if (gnutls_initalized){
1048
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();