118
83
#include <avahi-common/error.h>
121
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
86
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
124
88
init_gnutls_session(),
126
#include <gnutls/openpgp.h>
127
/* gnutls_certificate_set_openpgp_key_file(),
128
GNUTLS_OPENPGP_FMT_BASE64 */
90
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
91
GNUTLS_OPENPGP_FMT_BASE64 */
131
#include <gpgme.h> /* All GPGME types, constants and
94
#include <gpgme.h> /* All GPGME types, constants and functions
134
96
GPGME_PROTOCOL_OpenPGP,
137
99
#define BUFFER_SIZE 256
139
#define PATHDIR "/conf/conf.d/mandos"
140
#define SECKEY "seckey.txt"
141
#define PUBKEY "pubkey.txt"
142
#define HOOKDIR "/lib/mandos/network-hooks.d"
144
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
145
103
static const char mandos_protocol_version[] = "1";
146
const char *argp_program_version = "mandos-client " VERSION;
147
const char *argp_program_bug_address = "<mandos@recompile.se>";
148
static const char sys_class_net[] = "/sys/class/net";
149
char *connect_to = NULL;
150
const char *hookdir = HOOKDIR;
155
/* Doubly linked list that need to be circularly linked when used */
156
typedef struct server{
159
AvahiIfIndex if_index;
161
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>";
166
107
/* Used for passing in values through the Avahi callback functions */
109
AvahiSimplePoll *simple_poll;
168
110
AvahiServer *server;
169
111
gnutls_certificate_credentials_t cred;
170
112
unsigned int dh_bits;
171
113
gnutls_dh_params_t dh_params;
172
114
const char *priority;
174
server *current_server;
176
size_t interfaces_size;
177
115
} mandos_context;
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
182
sig_atomic_t quit_now = 0;
183
int signal_received = 0;
185
/* Function to use when printing errors */
186
void perror_plus(const char *print_text){
188
fprintf(stderr, "Mandos plugin %s: ",
189
program_invocation_short_name);
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
int fprintf_plus(FILE *stream, const char *format, ...){
197
va_start (ap, format);
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
205
* Make additional room in "buffer" for at least BUFFER_SIZE more
206
* 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,
207
120
* "buffer_length" is how much is already used.
209
__attribute__((nonnull, warn_unused_result))
210
size_t incbuffer(char **buffer, size_t buffer_length,
211
size_t buffer_capacity){
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
215
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);
222
129
buffer_capacity += BUFFER_SIZE;
224
131
return buffer_capacity;
227
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
int af, server **current_server){
232
server *new_server = malloc(sizeof(server));
233
if(new_server == NULL){
234
perror_plus("malloc");
237
*new_server = (server){ .ip = strdup(ip),
239
.if_index = if_index,
241
if(new_server->ip == NULL){
242
perror_plus("strdup");
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
248
perror_plus("clock_gettime");
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
253
free((char *)(new_server->ip));
255
#pragma GCC diagnostic pop
260
/* Special case of first server */
261
if(*current_server == NULL){
262
new_server->next = new_server;
263
new_server->prev = new_server;
264
*current_server = new_server;
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
269
new_server->prev->next = new_server;
270
(*current_server)->prev = new_server;
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
278
__attribute__((nonnull, warn_unused_result))
279
static bool init_gpgme(const char * const seckey,
280
const char * const pubkey,
281
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;
283
144
gpgme_error_t rc;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
284
148
gpgme_engine_info_t engine_info;
287
* Helper function to insert pub and seckey to the engine keyring.
289
bool import_key(const char * const filename){
292
gpgme_data_t pgp_data;
294
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
300
rc = gpgme_data_new_from_fd(&pgp_data, fd);
301
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
307
rc = gpgme_op_import(mc->ctx, pgp_data);
308
if(rc != GPG_ERR_NO_ERROR){
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
314
gpgme_import_result_t import_result
315
= gpgme_op_import_result(mc->ctx);
316
if((import_result->imported < 1
317
or import_result->not_imported > 0)
318
and import_result->unchanged == 0){
319
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
321
"The total number of considered keys: %d\n",
322
import_result->considered);
324
"The number of keys without user ID: %d\n",
325
import_result->no_user_id);
327
"The total number of imported keys: %d\n",
328
import_result->imported);
329
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
330
import_result->imported_rsa);
331
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
332
import_result->unchanged);
333
fprintf_plus(stderr, "The number of new user IDs: %d\n",
334
import_result->new_user_ids);
335
fprintf_plus(stderr, "The number of new sub keys: %d\n",
336
import_result->new_sub_keys);
337
fprintf_plus(stderr, "The number of new signatures: %d\n",
338
import_result->new_signatures);
339
fprintf_plus(stderr, "The number of new revocations: %d\n",
340
import_result->new_revocations);
342
"The total number of secret keys read: %d\n",
343
import_result->secret_read);
345
"The number of imported secret keys: %d\n",
346
import_result->secret_imported);
348
"The number of unchanged secret keys: %d\n",
349
import_result->secret_unchanged);
350
fprintf_plus(stderr, "The number of keys not imported: %d\n",
351
import_result->not_imported);
352
for(gpgme_import_status_t import_status
353
= import_result->imports;
354
import_status != NULL;
355
import_status = import_status->next){
356
fprintf_plus(stderr, "Import status for key: %s\n",
358
if(import_status->result != GPG_ERR_NO_ERROR){
359
fprintf_plus(stderr, "Import result: %s: %s\n",
360
gpgme_strsource(import_status->result),
361
gpgme_strerror(import_status->result));
363
fprintf_plus(stderr, "Key status:\n");
365
import_status->status & GPGME_IMPORT_NEW
366
? "The key was new.\n"
367
: "The key was not new.\n");
369
import_status->status & GPGME_IMPORT_UID
370
? "The key contained new user IDs.\n"
371
: "The key did not contain new user IDs.\n");
373
import_status->status & GPGME_IMPORT_SIG
374
? "The key contained new signatures.\n"
375
: "The key did not contain new signatures.\n");
377
import_status->status & GPGME_IMPORT_SUBKEY
378
? "The key contained new sub keys.\n"
379
: "The key did not contain new sub keys.\n");
381
import_status->status & GPGME_IMPORT_SECRET
382
? "The key contained a secret key.\n"
383
: "The key did not contain a secret key.\n");
391
perror_plus("close");
393
gpgme_data_release(pgp_data);
398
fprintf_plus(stderr, "Initializing GPGME\n");
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
402
155
gpgme_check_version(NULL);
403
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
404
if(rc != GPG_ERR_NO_ERROR){
405
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
406
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));
410
163
/* Set GPGME home directory for the OpenPGP engine only */
411
rc = gpgme_get_engine_info(&engine_info);
412
if(rc != GPG_ERR_NO_ERROR){
413
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
414
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));
417
170
while(engine_info != NULL){
418
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
419
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
420
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
423
176
engine_info = engine_info->next;
425
178
if(engine_info == NULL){
426
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
431
/* Create new GPGME "context" */
432
rc = gpgme_new(&(mc->ctx));
433
if(rc != GPG_ERR_NO_ERROR){
434
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
435
gpgme_strsource(rc), gpgme_strerror(rc));
439
if(not import_key(pubkey) or not import_key(seckey)){
447
* Decrypt OpenPGP data.
448
* Returns -1 on error
450
__attribute__((nonnull, warn_unused_result))
451
static ssize_t pgp_packet_decrypt(const char *cryptotext,
455
gpgme_data_t dh_crypto, dh_plain;
458
size_t plaintext_capacity = 0;
459
ssize_t plaintext_length = 0;
462
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
465
183
/* Create new GPGME data buffer from memory cryptotext */
466
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
468
if(rc != GPG_ERR_NO_ERROR){
469
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
470
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));
474
192
/* Create new empty GPGME data buffer for the plaintext */
475
193
rc = gpgme_data_new(&dh_plain);
476
if(rc != GPG_ERR_NO_ERROR){
477
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
478
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));
479
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;
483
210
/* Decrypt data from the cryptotext data buffer to the plaintext
485
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
486
if(rc != GPG_ERR_NO_ERROR){
487
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
488
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));
489
216
plaintext_length = -1;
491
gpgme_decrypt_result_t result;
492
result = gpgme_op_decrypt_result(mc->ctx);
494
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
496
if(result->unsupported_algorithm != NULL) {
497
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
498
result->unsupported_algorithm);
500
fprintf_plus(stderr, "Wrong key usage: %s\n",
501
result->wrong_key_usage ? "Yes" : "No");
502
if(result->file_name != NULL){
503
fprintf_plus(stderr, "File name: %s\n", result->file_name);
506
for(gpgme_recipient_t r = result->recipients; r != NULL;
508
fprintf_plus(stderr, "Public key algorithm: %s\n",
509
gpgme_pubkey_algo_name(r->pubkey_algo));
510
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
511
fprintf_plus(stderr, "Secret key available: %s\n",
512
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
516
217
goto decrypt_end;
520
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
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;
240
while(recipient != NULL){
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
247
recipient = recipient->next;
523
253
/* Seek back to the beginning of the GPGME plaintext data buffer */
524
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
525
perror_plus("gpgme_data_seek");
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
526
256
plaintext_length = -1;
527
257
goto decrypt_end;
530
260
*plaintext = NULL;
532
plaintext_capacity = incbuffer(plaintext,
533
(size_t)plaintext_length,
535
if(plaintext_capacity == 0){
536
perror_plus("incbuffer");
537
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;
541
271
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
543
273
/* Print the data, if any */
549
perror_plus("gpgme_data_read");
279
perror("gpgme_data_read");
550
280
plaintext_length = -1;
551
281
goto decrypt_end;
553
283
plaintext_length += ret;
557
fprintf_plus(stderr, "Decrypted password is: ");
287
fprintf(stderr, "Decrypted password is: ");
558
288
for(ssize_t i = 0; i < plaintext_length; i++){
559
289
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
614
341
/* OpenPGP credentials */
615
ret = gnutls_certificate_allocate_credentials(&mc->cred);
616
if(ret != GNUTLS_E_SUCCESS){
617
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
618
safer_gnutls_strerror(ret));
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
623
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
624
" secret key %s as GnuTLS credentials\n",
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
629
356
ret = gnutls_certificate_set_openpgp_key_file
630
(mc->cred, pubkeyfilename, seckeyfilename,
631
GNUTLS_OPENPGP_FMT_BASE64);
632
if(ret != GNUTLS_E_SUCCESS){
634
"Error[%d] while reading the OpenPGP key pair ('%s',"
635
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
636
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
637
safer_gnutls_strerror(ret));
357
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
358
if (ret != GNUTLS_E_SUCCESS) {
360
"Error[%d] while reading the OpenPGP key pair ('%s',"
361
" '%s')\n", ret, pubkeyfile, seckeyfile);
362
fprintf(stdout, "The GnuTLS error is: %s\n",
363
safer_gnutls_strerror(ret));
641
367
/* GnuTLS server initialization */
642
368
ret = gnutls_dh_params_init(&mc->dh_params);
643
if(ret != GNUTLS_E_SUCCESS){
644
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
645
" initialization: %s\n",
646
safer_gnutls_strerror(ret));
649
/* If a Diffie-Hellman parameters file was given, try to use it */
650
if(dhparamsfilename != NULL){
651
gnutls_datum_t params = { .data = NULL, .size = 0 };
653
int dhpfile = open(dhparamsfilename, O_RDONLY);
656
dhparamsfilename = NULL;
659
size_t params_capacity = 0;
661
params_capacity = incbuffer((char **)¶ms.data,
663
(size_t)params_capacity);
664
if(params_capacity == 0){
665
perror_plus("incbuffer");
668
dhparamsfilename = NULL;
671
ssize_t bytes_read = read(dhpfile,
672
params.data + params.size,
678
/* check bytes_read for failure */
683
dhparamsfilename = NULL;
686
params.size += (unsigned int)bytes_read;
688
ret = close(dhpfile);
690
perror_plus("close");
692
if(params.data == NULL){
693
dhparamsfilename = NULL;
695
if(dhparamsfilename == NULL){
698
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
699
GNUTLS_X509_FMT_PEM);
700
if(ret != GNUTLS_E_SUCCESS){
701
fprintf_plus(stderr, "Failed to parse DH parameters in file"
702
" \"%s\": %s\n", dhparamsfilename,
703
safer_gnutls_strerror(ret));
704
dhparamsfilename = NULL;
709
if(dhparamsfilename == NULL){
710
if(mc->dh_bits == 0){
711
/* Find out the optimal number of DH bits */
712
/* Try to read the private key file */
713
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
715
int secfile = open(seckeyfilename, O_RDONLY);
720
size_t buffer_capacity = 0;
722
buffer_capacity = incbuffer((char **)&buffer.data,
724
(size_t)buffer_capacity);
725
if(buffer_capacity == 0){
726
perror_plus("incbuffer");
731
ssize_t bytes_read = read(secfile,
732
buffer.data + buffer.size,
738
/* check bytes_read for failure */
745
buffer.size += (unsigned int)bytes_read;
749
/* If successful, use buffer to parse private key */
750
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
751
if(buffer.data != NULL){
753
gnutls_openpgp_privkey_t privkey = NULL;
754
ret = gnutls_openpgp_privkey_init(&privkey);
755
if(ret != GNUTLS_E_SUCCESS){
756
fprintf_plus(stderr, "Error initializing OpenPGP key"
758
safer_gnutls_strerror(ret));
762
ret = gnutls_openpgp_privkey_import
763
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
764
if(ret != GNUTLS_E_SUCCESS){
765
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
766
safer_gnutls_strerror(ret));
772
/* Use private key to suggest an appropriate
774
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
775
gnutls_openpgp_privkey_deinit(privkey);
777
fprintf_plus(stderr, "This OpenPGP key implies using"
778
" a GnuTLS security parameter \"%s\".\n",
779
safe_string(gnutls_sec_param_get_name
785
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
786
/* Err on the side of caution */
787
sec_param = GNUTLS_SEC_PARAM_ULTRA;
789
fprintf_plus(stderr, "Falling back to security parameter"
791
safe_string(gnutls_sec_param_get_name
796
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
800
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
801
" implies %u DH bits; using that.\n",
802
safe_string(gnutls_sec_param_get_name
807
fprintf_plus(stderr, "Failed to get implied number of DH"
808
" bits for security parameter \"%s\"): %s\n",
809
safe_string(gnutls_sec_param_get_name
811
safer_gnutls_strerror(ret));
815
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
818
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
819
if(ret != GNUTLS_E_SUCCESS){
820
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
821
" bits): %s\n", mc->dh_bits,
822
safer_gnutls_strerror(ret));
369
if (ret != GNUTLS_E_SUCCESS) {
370
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
371
" %s\n", safer_gnutls_strerror(ret));
374
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
375
if (ret != GNUTLS_E_SUCCESS) {
376
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
377
safer_gnutls_strerror(ret));
826
381
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
832
387
gnutls_certificate_free_credentials(mc->cred);
833
gnutls_dh_params_deinit(mc->dh_params);
388
gnutls_global_deinit();
837
__attribute__((nonnull, warn_unused_result))
838
static int init_gnutls_session(gnutls_session_t *session,
393
static int init_gnutls_session(mandos_context *mc,
394
gnutls_session_t *session){
841
396
/* GnuTLS session creation */
843
ret = gnutls_init(session, GNUTLS_SERVER);
847
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
848
if(ret != GNUTLS_E_SUCCESS){
850
"Error in GnuTLS session initialization: %s\n",
851
safer_gnutls_strerror(ret));
397
ret = gnutls_init(session, GNUTLS_SERVER);
398
if (ret != GNUTLS_E_SUCCESS){
399
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
400
safer_gnutls_strerror(ret));
857
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
859
gnutls_deinit(*session);
862
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
863
if(ret != GNUTLS_E_SUCCESS){
864
fprintf_plus(stderr, "Syntax error at: %s\n", err);
865
fprintf_plus(stderr, "GnuTLS error: %s\n",
866
safer_gnutls_strerror(ret));
867
gnutls_deinit(*session);
405
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
406
if (ret != GNUTLS_E_SUCCESS) {
407
fprintf(stderr, "Syntax error at: %s\n", err);
408
fprintf(stderr, "GnuTLS error: %s\n",
409
safer_gnutls_strerror(ret));
410
gnutls_deinit (*session);
873
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
876
gnutls_deinit(*session);
879
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
880
if(ret != GNUTLS_E_SUCCESS){
881
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
882
safer_gnutls_strerror(ret));
883
gnutls_deinit(*session);
415
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
417
if (ret != GNUTLS_E_SUCCESS) {
418
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
419
safer_gnutls_strerror(ret));
420
gnutls_deinit (*session);
887
424
/* ignore client certificate if any. */
888
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
425
gnutls_certificate_server_set_request (*session,
428
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
894
434
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
895
435
__attribute__((unused)) const char *txt){}
897
/* Set effective uid to 0, return errno */
898
__attribute__((warn_unused_result))
899
int raise_privileges(void){
900
int old_errno = errno;
902
if(seteuid(0) == -1){
909
/* Set effective and real user ID to 0. Return errno. */
910
__attribute__((warn_unused_result))
911
int raise_privileges_permanently(void){
912
int old_errno = errno;
913
int ret = raise_privileges();
925
/* Set effective user ID to unprivileged saved user ID */
926
__attribute__((warn_unused_result))
927
int lower_privileges(void){
928
int old_errno = errno;
930
if(seteuid(uid) == -1){
937
/* Lower privileges permanently */
938
__attribute__((warn_unused_result))
939
int lower_privileges_permanently(void){
940
int old_errno = errno;
942
if(setuid(uid) == -1){
949
/* Helper function to add_local_route() and delete_local_route() */
950
__attribute__((nonnull, warn_unused_result))
951
static bool add_delete_local_route(const bool add,
953
AvahiIfIndex if_index){
955
char helper[] = "mandos-client-iprouteadddel";
956
char add_arg[] = "add";
957
char delete_arg[] = "delete";
958
char debug_flag[] = "--debug";
959
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
960
if(pluginhelperdir == NULL){
962
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
963
" variable not set; cannot run helper\n");
968
char interface[IF_NAMESIZE];
969
if(if_indextoname((unsigned int)if_index, interface) == NULL){
970
perror_plus("if_indextoname");
974
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
976
perror_plus("open(\"/dev/null\", O_RDONLY)");
982
/* Raise privileges */
983
errno = raise_privileges_permanently();
985
perror_plus("Failed to raise privileges");
986
/* _exit(EX_NOPERM); */
992
perror_plus("setgid");
995
/* Reset supplementary groups */
997
ret = setgroups(0, NULL);
999
perror_plus("setgroups");
1003
ret = dup2(devnull, STDIN_FILENO);
1005
perror_plus("dup2(devnull, STDIN_FILENO)");
1008
ret = close(devnull);
1010
perror_plus("close");
1013
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1015
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1018
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1023
if(helperdir_fd == -1){
1024
perror_plus("open");
1025
_exit(EX_UNAVAILABLE);
1027
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1029
if(helper_fd == -1){
1030
perror_plus("openat");
1031
close(helperdir_fd);
1032
_exit(EX_UNAVAILABLE);
1034
close(helperdir_fd);
1036
#pragma GCC diagnostic push
1037
#pragma GCC diagnostic ignored "-Wcast-qual"
1039
if(fexecve(helper_fd, (char *const [])
1040
{ helper, add ? add_arg : delete_arg, (char *)address,
1041
interface, debug ? debug_flag : NULL, NULL },
1044
#pragma GCC diagnostic pop
1046
perror_plus("fexecve");
1047
_exit(EXIT_FAILURE);
1051
perror_plus("fork");
1058
pret = waitpid(pid, &status, 0);
1059
if(pret == -1 and errno == EINTR and quit_now){
1060
int errno_raising = 0;
1061
if((errno = raise_privileges()) != 0){
1062
errno_raising = errno;
1063
perror_plus("Failed to raise privileges in order to"
1064
" kill helper program");
1066
if(kill(pid, SIGTERM) == -1){
1067
perror_plus("kill");
1069
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1070
perror_plus("Failed to lower privileges after killing"
1075
} while(pret == -1 and errno == EINTR);
1077
perror_plus("waitpid");
1080
if(WIFEXITED(status)){
1081
if(WEXITSTATUS(status) != 0){
1082
fprintf_plus(stderr, "Error: iprouteadddel exited"
1083
" with status %d\n", WEXITSTATUS(status));
1088
if(WIFSIGNALED(status)){
1089
fprintf_plus(stderr, "Error: iprouteadddel died by"
1090
" signal %d\n", WTERMSIG(status));
1093
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1097
__attribute__((nonnull, warn_unused_result))
1098
static bool add_local_route(const char *address,
1099
AvahiIfIndex if_index){
1101
fprintf_plus(stderr, "Adding route to %s\n", address);
1103
return add_delete_local_route(true, address, if_index);
1106
__attribute__((nonnull, warn_unused_result))
1107
static bool delete_local_route(const char *address,
1108
AvahiIfIndex if_index){
1110
fprintf_plus(stderr, "Removing route to %s\n", address);
1112
return add_delete_local_route(false, address, if_index);
1115
437
/* Called when a Mandos server is found */
1116
__attribute__((nonnull, warn_unused_result))
1117
static int start_mandos_communication(const char *ip, in_port_t port,
438
static int start_mandos_communication(const char *ip, uint16_t port,
1118
439
AvahiIfIndex if_index,
1119
int af, mandos_context *mc){
1120
int ret, tcp_sd = -1;
1122
struct sockaddr_storage to;
442
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1123
443
char *buffer = NULL;
1124
char *decrypted_buffer = NULL;
444
char *decrypted_buffer;
1125
445
size_t buffer_length = 0;
1126
446
size_t buffer_capacity = 0;
447
ssize_t decrypted_buffer_size;
450
char interface[IF_NAMESIZE];
1129
451
gnutls_session_t session;
1130
int pf; /* Protocol family */
1131
bool route_added = false;
1148
fprintf_plus(stderr, "Bad address family: %d\n", af);
1153
/* If the interface is specified and we have a list of interfaces */
1154
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1155
/* Check if the interface is one of the interfaces we are using */
1158
char *interface = NULL;
1159
while((interface = argz_next(mc->interfaces,
1160
mc->interfaces_size,
1162
if(if_nametoindex(interface) == (unsigned int)if_index){
1169
/* This interface does not match any in the list, so we don't
1170
connect to the server */
1172
char interface[IF_NAMESIZE];
1173
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1174
perror_plus("if_indextoname");
1176
fprintf_plus(stderr, "Skipping server on non-used interface"
1178
if_indextoname((unsigned int)if_index,
453
ret = init_gnutls_session (mc, &session);
459
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
463
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
470
if(if_indextoname((unsigned int)if_index, interface) == NULL){
471
perror("if_indextoname");
474
fprintf(stderr, "Binding to interface %s\n", interface);
1186
ret = init_gnutls_session(&session, mc);
477
memset(&to,0,sizeof(to)); /* Spurious warning */
478
to.in6.sin6_family = AF_INET6;
479
/* It would be nice to have a way to detect if we were passed an
480
IPv4 address here. Now we assume an IPv6 address. */
481
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
1192
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1193
PRIuMAX "\n", ip, (uintmax_t)port);
1196
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1199
perror_plus("socket");
1210
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1211
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1212
ret = inet_pton(af, ip, &to6->sin6_addr);
1214
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1215
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1216
ret = inet_pton(af, ip, &to4->sin_addr);
1220
perror_plus("inet_pton");
1226
fprintf_plus(stderr, "Bad address: %s\n", ip);
1231
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1232
if(IN6_IS_ADDR_LINKLOCAL
1233
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1234
if(if_index == AVAHI_IF_UNSPEC){
1235
fprintf_plus(stderr, "An IPv6 link-local address is"
1236
" incomplete without a network interface\n");
1240
/* Set the network interface number as scope */
1241
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1244
((struct sockaddr_in *)&to)->sin_port = htons(port);
487
fprintf(stderr, "Bad address: %s\n", ip);
490
to.in6.sin6_port = htons(port); /* Spurious warning */
492
to.in6.sin6_scope_id = (uint32_t)if_index;
1253
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1254
char interface[IF_NAMESIZE];
1255
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1256
perror_plus("if_indextoname");
1258
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1259
"\n", ip, interface, (uintmax_t)port);
1262
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1263
ip, (uintmax_t)port);
1265
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1266
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1268
ret = getnameinfo((struct sockaddr *)&to,
1269
sizeof(struct sockaddr_in6),
1270
addrstr, sizeof(addrstr), NULL, 0,
1273
ret = getnameinfo((struct sockaddr *)&to,
1274
sizeof(struct sockaddr_in),
1275
addrstr, sizeof(addrstr), NULL, 0,
1278
if(ret == EAI_SYSTEM){
1279
perror_plus("getnameinfo");
1280
} else if(ret != 0) {
1281
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1282
} else if(strcmp(addrstr, ip) != 0){
1283
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1294
ret = connect(tcp_sd, (struct sockaddr *)&to,
1295
sizeof(struct sockaddr_in6));
1297
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1298
sizeof(struct sockaddr_in));
1301
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1302
and if_index != AVAHI_IF_UNSPEC
1303
and connect_to == NULL
1304
and not route_added and
1305
((af == AF_INET6 and not
1306
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1308
or (af == AF_INET and
1309
/* Not a a IPv4LL address */
1310
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1311
& 0xFFFF0000L) != 0xA9FE0000L))){
1312
/* Work around Avahi bug - Avahi does not announce link-local
1313
addresses if it has a global address, so local hosts with
1314
*only* a link-local address (e.g. Mandos clients) cannot
1315
connect to a Mandos server announced by Avahi on a server
1316
host with a global address. Work around this by retrying
1317
with an explicit route added with the server's address.
1319
Avahi bug reference:
1320
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1321
https://bugs.debian.org/587961
1324
fprintf_plus(stderr, "Mandos server unreachable, trying"
1328
route_added = add_local_route(ip, if_index);
1334
if(errno != ECONNREFUSED or debug){
1336
perror_plus("connect");
495
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
497
char addrstr[INET6_ADDRSTRLEN] = "";
498
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
499
sizeof(addrstr)) == NULL){
502
if(strcmp(addrstr, ip) != 0){
503
fprintf(stderr, "Canonical address form: %s\n", addrstr);
508
ret = connect(tcp_sd, &to.in, sizeof(to));
1349
514
const char *out = mandos_protocol_version;
1352
517
size_t out_size = strlen(out);
1353
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1354
out_size - written));
1357
perror_plus("write");
518
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
out_size - written));
1359
523
goto mandos_end;
1361
525
written += (size_t)ret;
1362
526
if(written < out_size){
1365
if(out == mandos_protocol_version){
529
if (out == mandos_protocol_version){
1380
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1388
/* This casting via intptr_t is to eliminate warning about casting
1389
an int to a pointer type. This is exactly how the GnuTLS Guile
1390
function "set-session-transport-fd!" does it. */
1391
gnutls_transport_set_ptr(session,
1392
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1400
ret = gnutls_handshake(session);
539
fprintf(stderr, "Establishing TLS session with %s\n", ip);
542
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
545
ret = gnutls_handshake (session);
1405
546
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1407
if(ret != GNUTLS_E_SUCCESS){
548
if (ret != GNUTLS_E_SUCCESS){
1409
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
550
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1413
554
goto mandos_end;
1416
557
/* Read OpenPGP packet that contains the wanted password */
1419
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
560
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
1430
buffer_capacity = incbuffer(&buffer, buffer_length,
1432
if(buffer_capacity == 0){
1434
perror_plus("incbuffer");
1444
sret = gnutls_record_recv(session, buffer+buffer_length,
565
buffer_capacity = adjustbuffer(&buffer, buffer_length,
567
if (buffer_capacity == 0){
568
perror("adjustbuffer");
573
ret = gnutls_record_recv(session, buffer+buffer_length,
1451
580
case GNUTLS_E_INTERRUPTED:
1452
581
case GNUTLS_E_AGAIN:
1454
583
case GNUTLS_E_REHANDSHAKE:
1456
ret = gnutls_handshake(session);
585
ret = gnutls_handshake (session);
1462
586
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1464
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
588
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1468
591
goto mandos_end;
1472
fprintf_plus(stderr, "Unknown error while reading data from"
1473
" encrypted session with Mandos server\n");
1474
gnutls_bye(session, GNUTLS_SHUT_RDWR);
595
fprintf(stderr, "Unknown error while reading data from"
596
" encrypted session with Mandos server\n");
598
gnutls_bye (session, GNUTLS_SHUT_RDWR);
1476
599
goto mandos_end;
1479
buffer_length += (size_t) sret;
602
buffer_length += (size_t) ret;
1484
fprintf_plus(stderr, "Closing TLS session\n");
1493
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1498
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1500
if(buffer_length > 0){
1501
ssize_t decrypted_buffer_size;
1502
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1503
&decrypted_buffer, mc);
1504
if(decrypted_buffer_size >= 0){
607
fprintf(stderr, "Closing TLS session\n");
610
gnutls_bye (session, GNUTLS_SHUT_RDWR);
612
if (buffer_length > 0){
613
decrypted_buffer_size = pgp_packet_decrypt(buffer,
617
if (decrypted_buffer_size >= 0){
1508
619
while(written < (size_t) decrypted_buffer_size){
1514
ret = (int)fwrite(decrypted_buffer + written, 1,
1515
(size_t)decrypted_buffer_size - written,
620
ret = (int)fwrite (decrypted_buffer + written, 1,
621
(size_t)decrypted_buffer_size - written,
1517
623
if(ret == 0 and ferror(stdout)){
1520
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
625
fprintf(stderr, "Error writing encrypted data: %s\n",
1526
631
written += (size_t)ret;
1528
ret = fflush(stdout);
1532
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
633
free(decrypted_buffer);
1542
639
/* Shutdown procedure */
1547
if(not delete_local_route(ip, if_index)){
1548
fprintf_plus(stderr, "Failed to delete local route to %s on"
1549
" interface %d", ip, if_index);
1553
free(decrypted_buffer);
1556
ret = close(tcp_sd);
1562
perror_plus("close");
1564
gnutls_deinit(session);
644
gnutls_deinit (session);
1574
648
static void resolve_callback(AvahiSServiceResolver *r,
1575
649
AvahiIfIndex interface,
1576
AvahiProtocol proto,
650
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1577
651
AvahiResolverEvent event,
1578
652
const char *name,
1579
653
const char *type,
1688
736
case AVAHI_BROWSER_ALL_FOR_NOW:
1689
737
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1691
fprintf_plus(stderr, "No Mandos server found, still"
739
fprintf(stderr, "No Mandos server found, still searching...\n");
1698
/* Signal handler that stops main loop after SIGTERM */
1699
static void handle_sigterm(int sig){
1704
signal_received = sig;
1705
int old_errno = errno;
1706
/* set main loop to exit */
1707
if(simple_poll != NULL){
1708
avahi_simple_poll_quit(simple_poll);
1713
__attribute__((nonnull, warn_unused_result))
1714
bool get_flags(const char *ifname, struct ifreq *ifr){
1718
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1721
perror_plus("socket");
1725
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1726
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1727
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1731
perror_plus("ioctl SIOCGIFFLAGS");
1734
if((close(s) == -1) and debug){
1736
perror_plus("close");
1741
if((close(s) == -1) and debug){
1743
perror_plus("close");
1749
__attribute__((nonnull, warn_unused_result))
1750
bool good_flags(const char *ifname, const struct ifreq *ifr){
1752
/* Reject the loopback device */
1753
if(ifr->ifr_flags & IFF_LOOPBACK){
1755
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1760
/* Accept point-to-point devices only if connect_to is specified */
1761
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1763
fprintf_plus(stderr, "Accepting point-to-point interface"
1764
" \"%s\"\n", ifname);
1768
/* Otherwise, reject non-broadcast-capable devices */
1769
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1771
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1772
" \"%s\"\n", ifname);
1776
/* Reject non-ARP interfaces (including dummy interfaces) */
1777
if(ifr->ifr_flags & IFF_NOARP){
1779
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1785
/* Accept this device */
1787
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1793
* This function determines if a directory entry in /sys/class/net
1794
* corresponds to an acceptable network device.
1795
* (This function is passed to scandir(3) as a filter function.)
1797
__attribute__((nonnull, warn_unused_result))
1798
int good_interface(const struct dirent *if_entry){
1799
if(if_entry->d_name[0] == '.'){
1804
if(not get_flags(if_entry->d_name, &ifr)){
1806
fprintf_plus(stderr, "Failed to get flags for interface "
1807
"\"%s\"\n", if_entry->d_name);
1812
if(not good_flags(if_entry->d_name, &ifr)){
1819
* This function determines if a network interface is up.
1821
__attribute__((nonnull, warn_unused_result))
1822
bool interface_is_up(const char *interface){
1824
if(not get_flags(interface, &ifr)){
1826
fprintf_plus(stderr, "Failed to get flags for interface "
1827
"\"%s\"\n", interface);
1832
return (bool)(ifr.ifr_flags & IFF_UP);
1836
* This function determines if a network interface is running
1838
__attribute__((nonnull, warn_unused_result))
1839
bool interface_is_running(const char *interface){
1841
if(not get_flags(interface, &ifr)){
1843
fprintf_plus(stderr, "Failed to get flags for interface "
1844
"\"%s\"\n", interface);
1849
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1852
__attribute__((nonnull, pure, warn_unused_result))
1853
int notdotentries(const struct dirent *direntry){
1854
/* Skip "." and ".." */
1855
if(direntry->d_name[0] == '.'
1856
and (direntry->d_name[1] == '\0'
1857
or (direntry->d_name[1] == '.'
1858
and direntry->d_name[2] == '\0'))){
1864
/* Is this directory entry a runnable program? */
1865
__attribute__((nonnull, warn_unused_result))
1866
int runnable_hook(const struct dirent *direntry){
1871
if((direntry->d_name)[0] == '\0'){
1876
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1877
"abcdefghijklmnopqrstuvwxyz"
1880
if((direntry->d_name)[sret] != '\0'){
1881
/* Contains non-allowed characters */
1883
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1889
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1892
perror_plus("Could not stat hook");
1896
if(not (S_ISREG(st.st_mode))){
1897
/* Not a regular file */
1899
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1904
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1905
/* Not executable */
1907
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1913
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1919
__attribute__((nonnull, warn_unused_result))
1920
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1921
mandos_context *mc){
1923
struct timespec now;
1924
struct timespec waited_time;
1925
intmax_t block_time;
1928
if(mc->current_server == NULL){
1930
fprintf_plus(stderr, "Wait until first server is found."
1933
ret = avahi_simple_poll_iterate(s, -1);
1936
fprintf_plus(stderr, "Check current_server if we should run"
1939
/* the current time */
1940
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1942
perror_plus("clock_gettime");
1945
/* Calculating in ms how long time between now and server
1946
who we visted longest time ago. Now - last seen. */
1947
waited_time.tv_sec = (now.tv_sec
1948
- mc->current_server->last_seen.tv_sec);
1949
waited_time.tv_nsec = (now.tv_nsec
1950
- mc->current_server->last_seen.tv_nsec);
1951
/* total time is 10s/10,000ms.
1952
Converting to s from ms by dividing by 1,000,
1953
and ns to ms by dividing by 1,000,000. */
1954
block_time = ((retry_interval
1955
- ((intmax_t)waited_time.tv_sec * 1000))
1956
- ((intmax_t)waited_time.tv_nsec / 1000000));
1959
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1963
if(block_time <= 0){
1964
ret = start_mandos_communication(mc->current_server->ip,
1965
mc->current_server->port,
1966
mc->current_server->if_index,
1967
mc->current_server->af, mc);
1969
avahi_simple_poll_quit(s);
1972
ret = clock_gettime(CLOCK_MONOTONIC,
1973
&mc->current_server->last_seen);
1975
perror_plus("clock_gettime");
1978
mc->current_server = mc->current_server->next;
1979
block_time = 0; /* Call avahi to find new Mandos
1980
servers, but don't block */
1983
ret = avahi_simple_poll_iterate(s, (int)block_time);
1986
if(ret > 0 or errno != EINTR){
1987
return (ret != 1) ? ret : 0;
1993
__attribute__((nonnull))
1994
void run_network_hooks(const char *mode, const char *interface,
1996
struct dirent **direntries = NULL;
1997
if(hookdir_fd == -1){
1998
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2000
if(hookdir_fd == -1){
2001
if(errno == ENOENT){
2003
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2004
" found\n", hookdir);
2007
perror_plus("open");
2012
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2014
perror_plus("open(\"/dev/null\", O_RDONLY)");
2017
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2018
runnable_hook, alphasort);
2020
perror_plus("scandir");
2024
struct dirent *direntry;
2026
for(int i = 0; i < numhooks; i++){
2027
direntry = direntries[i];
2029
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2032
pid_t hook_pid = fork();
2035
/* Raise privileges */
2036
errno = raise_privileges_permanently();
2038
perror_plus("Failed to raise privileges");
2045
perror_plus("setgid");
2048
/* Reset supplementary groups */
2050
ret = setgroups(0, NULL);
2052
perror_plus("setgroups");
2055
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2057
perror_plus("setenv");
2060
ret = setenv("DEVICE", interface, 1);
2062
perror_plus("setenv");
2065
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2067
perror_plus("setenv");
2070
ret = setenv("MODE", mode, 1);
2072
perror_plus("setenv");
2076
ret = asprintf(&delaystring, "%f", (double)delay);
2078
perror_plus("asprintf");
2081
ret = setenv("DELAY", delaystring, 1);
2084
perror_plus("setenv");
2088
if(connect_to != NULL){
2089
ret = setenv("CONNECT", connect_to, 1);
2091
perror_plus("setenv");
2095
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2099
perror_plus("openat");
2100
_exit(EXIT_FAILURE);
2102
if(close(hookdir_fd) == -1){
2103
perror_plus("close");
2104
_exit(EXIT_FAILURE);
2106
ret = dup2(devnull, STDIN_FILENO);
2108
perror_plus("dup2(devnull, STDIN_FILENO)");
2111
ret = close(devnull);
2113
perror_plus("close");
2116
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2118
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2121
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2123
perror_plus("fexecve");
2124
_exit(EXIT_FAILURE);
2128
perror_plus("fork");
2133
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2134
perror_plus("waitpid");
2138
if(WIFEXITED(status)){
2139
if(WEXITSTATUS(status) != 0){
2140
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2141
" with status %d\n", direntry->d_name,
2142
WEXITSTATUS(status));
2146
} else if(WIFSIGNALED(status)){
2147
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2148
" signal %d\n", direntry->d_name,
2153
fprintf_plus(stderr, "Warning: network hook \"%s\""
2154
" crashed\n", direntry->d_name);
2160
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2166
if(close(hookdir_fd) == -1){
2167
perror_plus("close");
2174
__attribute__((nonnull, warn_unused_result))
2175
int bring_up_interface(const char *const interface,
2177
int old_errno = errno;
2179
struct ifreq network;
2180
unsigned int if_index = if_nametoindex(interface);
2182
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2192
if(not interface_is_up(interface)){
2194
int ioctl_errno = 0;
2195
if(not get_flags(interface, &network)){
2197
fprintf_plus(stderr, "Failed to get flags for interface "
2198
"\"%s\"\n", interface);
2202
network.ifr_flags |= IFF_UP; /* set flag */
2204
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2207
perror_plus("socket");
2215
perror_plus("close");
2222
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2226
/* Raise privileges */
2227
ret_errno = raise_privileges();
2230
perror_plus("Failed to raise privileges");
2235
bool restore_loglevel = false;
2237
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2238
messages about the network interface to mess up the prompt */
2239
ret_linux = klogctl(8, NULL, 5);
2240
if(ret_linux == -1){
2241
perror_plus("klogctl");
2243
restore_loglevel = true;
2246
#endif /* __linux__ */
2247
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2248
ioctl_errno = errno;
2250
if(restore_loglevel){
2251
ret_linux = klogctl(7, NULL, 0);
2252
if(ret_linux == -1){
2253
perror_plus("klogctl");
2256
#endif /* __linux__ */
2258
/* If raise_privileges() succeeded above */
2260
/* Lower privileges */
2261
ret_errno = lower_privileges();
2264
perror_plus("Failed to lower privileges");
2268
/* Close the socket */
2271
perror_plus("close");
2274
if(ret_setflags == -1){
2275
errno = ioctl_errno;
2276
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2281
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2285
/* Sleep checking until interface is running.
2286
Check every 0.25s, up to total time of delay */
2287
for(int i = 0; i < delay * 4; i++){
2288
if(interface_is_running(interface)){
2291
struct timespec sleeptime = { .tv_nsec = 250000000 };
2292
ret = nanosleep(&sleeptime, NULL);
2293
if(ret == -1 and errno != EINTR){
2294
perror_plus("nanosleep");
2302
__attribute__((nonnull, warn_unused_result))
2303
int take_down_interface(const char *const interface){
2304
int old_errno = errno;
2305
struct ifreq network;
2306
unsigned int if_index = if_nametoindex(interface);
2308
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2312
if(interface_is_up(interface)){
2314
int ioctl_errno = 0;
2315
if(not get_flags(interface, &network) and debug){
2317
fprintf_plus(stderr, "Failed to get flags for interface "
2318
"\"%s\"\n", interface);
2322
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2324
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2327
perror_plus("socket");
2333
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2337
/* Raise privileges */
2338
ret_errno = raise_privileges();
2341
perror_plus("Failed to raise privileges");
2344
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2345
ioctl_errno = errno;
2347
/* If raise_privileges() succeeded above */
2349
/* Lower privileges */
2350
ret_errno = lower_privileges();
2353
perror_plus("Failed to lower privileges");
2357
/* Close the socket */
2358
int ret = close(sd);
2360
perror_plus("close");
2363
if(ret_setflags == -1){
2364
errno = ioctl_errno;
2365
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2370
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
745
/* Combines file name and path and returns the malloced new
746
string. some sane checks could/should be added */
747
static const char *combinepath(const char *first, const char *second){
748
size_t f_len = strlen(first);
749
size_t s_len = strlen(second);
750
char *tmp = malloc(f_len + s_len + 2);
755
memcpy(tmp, first, f_len); /* Spurious warning */
759
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
761
tmp[f_len + 1 + s_len] = '\0';
2378
766
int main(int argc, char *argv[]){
2379
mandos_context mc = { .server = NULL, .dh_bits = 0,
2380
.priority = "SECURE256:!CTYPE-X.509"
2381
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2382
.current_server = NULL, .interfaces = NULL,
2383
.interfaces_size = 0 };
2384
AvahiSServiceBrowser *sb = NULL;
2389
int exitcode = EXIT_SUCCESS;
2390
char *interfaces_to_take_down = NULL;
2391
size_t interfaces_to_take_down_size = 0;
2392
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2393
char old_tempdir[] = "/tmp/mandosXXXXXX";
2394
char *tempdir = NULL;
2395
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2396
const char *seckey = PATHDIR "/" SECKEY;
2397
const char *pubkey = PATHDIR "/" PUBKEY;
2398
const char *dh_params_file = NULL;
2399
char *interfaces_hooks = NULL;
2401
bool gnutls_initialized = false;
2402
bool gpgme_initialized = false;
2404
double retry_interval = 10; /* 10s between trying a server and
2405
retrying the same server again */
2407
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2408
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2413
/* Lower any group privileges we might have, just to be safe */
2417
perror_plus("setgid");
2420
/* Lower user privileges (temporarily) */
2424
perror_plus("seteuid");
2432
struct argp_option options[] = {
2433
{ .name = "debug", .key = 128,
2434
.doc = "Debug mode", .group = 3 },
2435
{ .name = "connect", .key = 'c',
2436
.arg = "ADDRESS:PORT",
2437
.doc = "Connect directly to a specific Mandos server",
2439
{ .name = "interface", .key = 'i',
2441
.doc = "Network interface that will be used to search for"
2444
{ .name = "seckey", .key = 's',
2446
.doc = "OpenPGP secret key file base name",
2448
{ .name = "pubkey", .key = 'p',
2450
.doc = "OpenPGP public key file base name",
2452
{ .name = "dh-bits", .key = 129,
2454
.doc = "Bit length of the prime number used in the"
2455
" Diffie-Hellman key exchange",
2457
{ .name = "dh-params", .key = 134,
2459
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2460
" for the Diffie-Hellman key exchange",
2462
{ .name = "priority", .key = 130,
2464
.doc = "GnuTLS priority string for the TLS handshake",
2466
{ .name = "delay", .key = 131,
2468
.doc = "Maximum delay to wait for interface startup",
2470
{ .name = "retry", .key = 132,
2472
.doc = "Retry interval used when denied by the Mandos server",
2474
{ .name = "network-hook-dir", .key = 133,
2476
.doc = "Directory where network hooks are located",
2479
* These reproduce what we would get without ARGP_NO_HELP
2481
{ .name = "help", .key = '?',
2482
.doc = "Give this help list", .group = -1 },
2483
{ .name = "usage", .key = -3,
2484
.doc = "Give a short usage message", .group = -1 },
2485
{ .name = "version", .key = 'V',
2486
.doc = "Print program version", .group = -1 },
2490
error_t parse_opt(int key, char *arg,
2491
struct argp_state *state){
2494
case 128: /* --debug */
2497
case 'c': /* --connect */
2500
case 'i': /* --interface */
2501
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2504
argp_error(state, "%s", strerror(ret_errno));
2507
case 's': /* --seckey */
2510
case 'p': /* --pubkey */
2513
case 129: /* --dh-bits */
2515
tmpmax = strtoimax(arg, &tmp, 10);
2516
if(errno != 0 or tmp == arg or *tmp != '\0'
2517
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2518
argp_error(state, "Bad number of DH bits");
2520
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2522
case 134: /* --dh-params */
2523
dh_params_file = arg;
2525
case 130: /* --priority */
2528
case 131: /* --delay */
2530
delay = strtof(arg, &tmp);
2531
if(errno != 0 or tmp == arg or *tmp != '\0'){
2532
argp_error(state, "Bad delay");
2534
case 132: /* --retry */
2536
retry_interval = strtod(arg, &tmp);
2537
if(errno != 0 or tmp == arg or *tmp != '\0'
2538
or (retry_interval * 1000) > INT_MAX
2539
or retry_interval < 0){
2540
argp_error(state, "Bad retry interval");
2543
case 133: /* --network-hook-dir */
2547
* These reproduce what we would get without ARGP_NO_HELP
2549
case '?': /* --help */
2550
argp_state_help(state, state->out_stream,
2551
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2552
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2553
case -3: /* --usage */
2554
argp_state_help(state, state->out_stream,
2555
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2556
case 'V': /* --version */
2557
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2558
exit(argp_err_exit_status);
2561
return ARGP_ERR_UNKNOWN;
2566
struct argp argp = { .options = options, .parser = parse_opt,
2568
.doc = "Mandos client -- Get and decrypt"
2569
" passwords from a Mandos server" };
2570
ret_errno = argp_parse(&argp, argc, argv,
2571
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2578
perror_plus("argp_parse");
2579
exitcode = EX_OSERR;
2582
exitcode = EX_USAGE;
2588
/* Work around Debian bug #633582:
2589
<https://bugs.debian.org/633582> */
2591
/* Re-raise privileges */
2592
ret = raise_privileges();
2595
perror_plus("Failed to raise privileges");
2599
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2600
int seckey_fd = open(seckey, O_RDONLY);
2601
if(seckey_fd == -1){
2602
perror_plus("open");
2604
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2606
perror_plus("fstat");
2608
if(S_ISREG(st.st_mode)
2609
and st.st_uid == 0 and st.st_gid == 0){
2610
ret = fchown(seckey_fd, uid, gid);
2612
perror_plus("fchown");
2620
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2621
int pubkey_fd = open(pubkey, O_RDONLY);
2622
if(pubkey_fd == -1){
2623
perror_plus("open");
2625
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2627
perror_plus("fstat");
2629
if(S_ISREG(st.st_mode)
2630
and st.st_uid == 0 and st.st_gid == 0){
2631
ret = fchown(pubkey_fd, uid, gid);
2633
perror_plus("fchown");
2641
if(dh_params_file != NULL
2642
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2643
int dhparams_fd = open(dh_params_file, O_RDONLY);
2644
if(dhparams_fd == -1){
2645
perror_plus("open");
2647
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2649
perror_plus("fstat");
2651
if(S_ISREG(st.st_mode)
2652
and st.st_uid == 0 and st.st_gid == 0){
2653
ret = fchown(dhparams_fd, uid, gid);
2655
perror_plus("fchown");
2663
/* Lower privileges */
2664
ret = lower_privileges();
2667
perror_plus("Failed to lower privileges");
2672
/* Remove invalid interface names (except "none") */
2674
char *interface = NULL;
2675
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2677
if(strcmp(interface, "none") != 0
2678
and if_nametoindex(interface) == 0){
2679
if(interface[0] != '\0'){
2680
fprintf_plus(stderr, "Not using nonexisting interface"
2681
" \"%s\"\n", interface);
2683
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2689
/* Run network hooks */
2691
if(mc.interfaces != NULL){
2692
interfaces_hooks = malloc(mc.interfaces_size);
2693
if(interfaces_hooks == NULL){
2694
perror_plus("malloc");
767
AvahiSServiceBrowser *sb = NULL;
770
int exitcode = EXIT_SUCCESS;
771
const char *interface = "eth0";
772
struct ifreq network;
776
char *connect_to = NULL;
777
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
778
const char *pubkeyfile = "pubkey.txt";
779
const char *seckeyfile = "seckey.txt";
780
mandos_context mc = { .simple_poll = NULL, .server = NULL,
781
.dh_bits = 1024, .priority = "SECURE256"};
782
bool gnutls_initalized = false;
785
struct argp_option options[] = {
786
{ .name = "debug", .key = 128,
787
.doc = "Debug mode", .group = 3 },
788
{ .name = "connect", .key = 'c',
790
.doc = "Connect directly to a sepcified mandos server",
792
{ .name = "interface", .key = 'i',
794
.doc = "Interface that Avahi will conntect through",
796
{ .name = "keydir", .key = 'd',
798
.doc = "Directory where the openpgp keyring is",
800
{ .name = "seckey", .key = 's',
802
.doc = "Secret openpgp key for gnutls authentication",
804
{ .name = "pubkey", .key = 'p',
806
.doc = "Public openpgp key for gnutls authentication",
808
{ .name = "dh-bits", .key = 129,
810
.doc = "dh-bits to use in gnutls communication",
812
{ .name = "priority", .key = 130,
814
.doc = "GNUTLS priority", .group = 1 },
819
error_t parse_opt (int key, char *arg,
820
struct argp_state *state) {
821
/* Get the INPUT argument from `argp_parse', which we know is
822
a pointer to our plugin list pointer. */
844
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
859
return ARGP_ERR_UNKNOWN;
864
struct argp argp = { .options = options, .parser = parse_opt,
866
.doc = "Mandos client -- Get and decrypt"
867
" passwords from mandos server" };
868
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
869
if (ret == ARGP_ERR_UNKNOWN){
870
fprintf(stderr, "Unkown error while parsing arguments\n");
871
exitcode = EXIT_FAILURE;
2697
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2698
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2700
run_network_hooks("start", interfaces_hooks != NULL ?
2701
interfaces_hooks : "", delay);
2705
avahi_set_log_function(empty_log);
2708
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2709
from the signal handler */
2710
/* Initialize the pseudo-RNG for Avahi */
2711
srand((unsigned int) time(NULL));
2712
simple_poll = avahi_simple_poll_new();
2713
if(simple_poll == NULL){
2714
fprintf_plus(stderr,
2715
"Avahi: Failed to create simple poll object.\n");
2716
exitcode = EX_UNAVAILABLE;
2720
sigemptyset(&sigterm_action.sa_mask);
2721
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2723
perror_plus("sigaddset");
2724
exitcode = EX_OSERR;
2727
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2729
perror_plus("sigaddset");
2730
exitcode = EX_OSERR;
2733
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2735
perror_plus("sigaddset");
2736
exitcode = EX_OSERR;
2739
/* Need to check if the handler is SIG_IGN before handling:
2740
| [[info:libc:Initial Signal Actions]] |
2741
| [[info:libc:Basic Signal Handling]] |
2743
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2745
perror_plus("sigaction");
2748
if(old_sigterm_action.sa_handler != SIG_IGN){
2749
ret = sigaction(SIGINT, &sigterm_action, NULL);
2751
perror_plus("sigaction");
2752
exitcode = EX_OSERR;
2756
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2758
perror_plus("sigaction");
2761
if(old_sigterm_action.sa_handler != SIG_IGN){
2762
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2764
perror_plus("sigaction");
2765
exitcode = EX_OSERR;
2769
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2771
perror_plus("sigaction");
2774
if(old_sigterm_action.sa_handler != SIG_IGN){
2775
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2777
perror_plus("sigaction");
2778
exitcode = EX_OSERR;
2783
/* If no interfaces were specified, make a list */
2784
if(mc.interfaces == NULL){
2785
struct dirent **direntries = NULL;
2786
/* Look for any good interfaces */
2787
ret = scandir(sys_class_net, &direntries, good_interface,
2790
/* Add all found interfaces to interfaces list */
2791
for(int i = 0; i < ret; ++i){
2792
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2793
direntries[i]->d_name);
2796
perror_plus("argz_add");
2797
free(direntries[i]);
2801
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2802
direntries[i]->d_name);
2804
free(direntries[i]);
2811
fprintf_plus(stderr, "Could not find a network interface\n");
876
pubkeyfile = combinepath(keydir, pubkeyfile);
877
if (pubkeyfile == NULL){
878
perror("combinepath");
2812
879
exitcode = EXIT_FAILURE;
2817
/* Bring up interfaces which are down, and remove any "none"s */
2819
char *interface = NULL;
2820
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2822
/* If interface name is "none", stop bringing up interfaces.
2823
Also remove all instances of "none" from the list */
2824
if(strcmp(interface, "none") == 0){
2825
argz_delete(&mc.interfaces, &mc.interfaces_size,
2828
while((interface = argz_next(mc.interfaces,
2829
mc.interfaces_size, interface))){
2830
if(strcmp(interface, "none") == 0){
2831
argz_delete(&mc.interfaces, &mc.interfaces_size,
2838
bool interface_was_up = interface_is_up(interface);
2839
errno = bring_up_interface(interface, delay);
2840
if(not interface_was_up){
2842
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2843
" %s\n", interface, strerror(errno));
2845
errno = argz_add(&interfaces_to_take_down,
2846
&interfaces_to_take_down_size,
2849
perror_plus("argz_add");
2854
if(debug and (interfaces_to_take_down == NULL)){
2855
fprintf_plus(stderr, "No interfaces were brought up\n");
2859
/* If we only got one interface, explicitly use only that one */
2860
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2862
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2865
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2872
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2874
fprintf_plus(stderr, "init_gnutls_global failed\n");
2875
exitcode = EX_UNAVAILABLE;
2878
gnutls_initialized = true;
2885
/* Try /run/tmp before /tmp */
2886
tempdir = mkdtemp(run_tempdir);
2887
if(tempdir == NULL and errno == ENOENT){
2889
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2890
run_tempdir, old_tempdir);
2892
tempdir = mkdtemp(old_tempdir);
2894
if(tempdir == NULL){
2895
perror_plus("mkdtemp");
2903
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2904
fprintf_plus(stderr, "init_gpgme failed\n");
2905
exitcode = EX_UNAVAILABLE;
2908
gpgme_initialized = true;
2915
if(connect_to != NULL){
2916
/* Connect directly, do not use Zeroconf */
2917
/* (Mainly meant for debugging) */
2918
char *address = strrchr(connect_to, ':');
2920
if(address == NULL){
2921
fprintf_plus(stderr, "No colon in address\n");
2922
exitcode = EX_USAGE;
2932
tmpmax = strtoimax(address+1, &tmp, 10);
2933
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2934
or tmpmax != (in_port_t)tmpmax){
2935
fprintf_plus(stderr, "Bad port number\n");
2936
exitcode = EX_USAGE;
2944
port = (in_port_t)tmpmax;
2946
/* Colon in address indicates IPv6 */
2948
if(strchr(connect_to, ':') != NULL){
2950
/* Accept [] around IPv6 address - see RFC 5952 */
2951
if(connect_to[0] == '[' and address[-1] == ']')
883
seckeyfile = combinepath(keydir, seckeyfile);
884
if (seckeyfile == NULL){
885
perror("combinepath");
889
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
891
fprintf(stderr, "init_gnutls_global\n");
2959
address = connect_to;
894
gnutls_initalized = true;
910
if_index = (AvahiIfIndex) if_nametoindex(interface);
912
fprintf(stderr, "No such interface: \"%s\"\n", interface);
916
if(connect_to != NULL){
917
/* Connect directly, do not use Zeroconf */
918
/* (Mainly meant for debugging) */
919
char *address = strrchr(connect_to, ':');
921
fprintf(stderr, "No colon in address\n");
922
exitcode = EXIT_FAILURE;
926
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
928
perror("Bad port number");
929
exitcode = EXIT_FAILURE;
933
address = connect_to;
934
ret = start_mandos_communication(address, port, if_index, &mc);
936
exitcode = EXIT_FAILURE;
938
exitcode = EXIT_SUCCESS;
2965
while(not quit_now){
2966
ret = start_mandos_communication(address, port, if_index, af,
2968
if(quit_now or ret == 0){
2972
fprintf_plus(stderr, "Retrying in %d seconds\n",
2973
(int)retry_interval);
2975
sleep((unsigned int)retry_interval);
2979
exitcode = EXIT_SUCCESS;
2990
AvahiServerConfig config;
2991
/* Do not publish any local Zeroconf records */
2992
avahi_server_config_init(&config);
2993
config.publish_hinfo = 0;
2994
config.publish_addresses = 0;
2995
config.publish_workstation = 0;
2996
config.publish_domain = 0;
2998
/* Allocate a new server */
2999
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3000
&config, NULL, NULL, &ret);
3002
/* Free the Avahi configuration data */
3003
avahi_server_config_free(&config);
3006
/* Check if creating the Avahi server object succeeded */
3007
if(mc.server == NULL){
3008
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3009
avahi_strerror(ret));
3010
exitcode = EX_UNAVAILABLE;
3018
/* Create the Avahi service browser */
3019
sb = avahi_s_service_browser_new(mc.server, if_index,
3020
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
3021
NULL, 0, browse_callback,
3024
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3025
avahi_strerror(avahi_server_errno(mc.server)));
3026
exitcode = EX_UNAVAILABLE;
3034
/* Run the main loop */
3037
fprintf_plus(stderr, "Starting Avahi loop search\n");
3040
ret = avahi_loop_with_timeout(simple_poll,
3041
(int)(retry_interval * 1000), &mc);
3043
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3044
(ret == 0) ? "successfully" : "with error");
943
/* If the interface is down, bring it up */
945
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
948
exitcode = EXIT_FAILURE;
951
strcpy(network.ifr_name, interface); /* Spurious warning */
952
ret = ioctl(sd, SIOCGIFFLAGS, &network);
954
perror("ioctl SIOCGIFFLAGS");
955
exitcode = EXIT_FAILURE;
958
if((network.ifr_flags & IFF_UP) == 0){
959
network.ifr_flags |= IFF_UP;
960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
962
perror("ioctl SIOCSIFFLAGS");
963
exitcode = EXIT_FAILURE;
971
avahi_set_log_function(empty_log);
974
/* Initialize the pseudo-RNG for Avahi */
975
srand((unsigned int) time(NULL));
977
/* Allocate main Avahi loop object */
978
mc.simple_poll = avahi_simple_poll_new();
979
if (mc.simple_poll == NULL) {
980
fprintf(stderr, "Avahi: Failed to create simple poll"
982
exitcode = EXIT_FAILURE;
987
AvahiServerConfig config;
988
/* Do not publish any local Zeroconf records */
989
avahi_server_config_init(&config);
990
config.publish_hinfo = 0;
991
config.publish_addresses = 0;
992
config.publish_workstation = 0;
993
config.publish_domain = 0;
995
/* Allocate a new server */
996
mc.server = avahi_server_new(avahi_simple_poll_get
997
(mc.simple_poll), &config, NULL,
1000
/* Free the Avahi configuration data */
1001
avahi_server_config_free(&config);
1004
/* Check if creating the Avahi server object succeeded */
1005
if (mc.server == NULL) {
1006
fprintf(stderr, "Failed to create Avahi server: %s\n",
1007
avahi_strerror(error));
1008
exitcode = EXIT_FAILURE;
1012
/* Create the Avahi service browser */
1013
sb = avahi_s_service_browser_new(mc.server, if_index,
1015
"_mandos._tcp", NULL, 0,
1016
browse_callback, &mc);
1018
fprintf(stderr, "Failed to create service browser: %s\n",
1019
avahi_strerror(avahi_server_errno(mc.server)));
1020
exitcode = EXIT_FAILURE;
1024
/* Run the main loop */
1027
fprintf(stderr, "Starting Avahi loop search\n");
1030
avahi_simple_poll_loop(mc.simple_poll);
3050
if(signal_received){
3051
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3052
argv[0], signal_received,
3053
strsignal(signal_received));
3055
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3059
/* Cleanup things */
3060
free(mc.interfaces);
3063
avahi_s_service_browser_free(sb);
3065
if(mc.server != NULL)
3066
avahi_server_free(mc.server);
3068
if(simple_poll != NULL)
3069
avahi_simple_poll_free(simple_poll);
3071
if(gnutls_initialized){
3072
gnutls_certificate_free_credentials(mc.cred);
3073
gnutls_dh_params_deinit(mc.dh_params);
3076
if(gpgme_initialized){
3077
gpgme_release(mc.ctx);
3080
/* Cleans up the circular linked list of Mandos servers the client
3082
if(mc.current_server != NULL){
3083
mc.current_server->prev->next = NULL;
3084
while(mc.current_server != NULL){
3085
server *next = mc.current_server->next;
3087
#pragma GCC diagnostic push
3088
#pragma GCC diagnostic ignored "-Wcast-qual"
3090
free((char *)(mc.current_server->ip));
3092
#pragma GCC diagnostic pop
3094
free(mc.current_server);
3095
mc.current_server = next;
3099
/* Re-raise privileges */
3101
ret = raise_privileges();
3104
perror_plus("Failed to raise privileges");
3107
/* Run network hooks */
3108
run_network_hooks("stop", interfaces_hooks != NULL ?
3109
interfaces_hooks : "", delay);
3111
/* Take down the network interfaces which were brought up */
3113
char *interface = NULL;
3114
while((interface = argz_next(interfaces_to_take_down,
3115
interfaces_to_take_down_size,
3117
ret = take_down_interface(interface);
3120
perror_plus("Failed to take down interface");
3123
if(debug and (interfaces_to_take_down == NULL)){
3124
fprintf_plus(stderr, "No interfaces needed to be taken"
3130
ret = lower_privileges_permanently();
3133
perror_plus("Failed to lower privileges permanently");
3137
free(interfaces_to_take_down);
3138
free(interfaces_hooks);
3140
void clean_dir_at(int base, const char * const dirname,
3142
struct dirent **direntries = NULL;
3144
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3150
perror_plus("open");
3153
int numentries = scandirat(dir_fd, ".", &direntries,
3154
notdotentries, alphasort);
3155
if(numentries >= 0){
3156
for(int i = 0; i < numentries; i++){
3158
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3159
dirname, direntries[i]->d_name);
3161
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3163
if(errno == EISDIR){
3164
dret = unlinkat(dir_fd, direntries[i]->d_name,
3167
if((dret == -1) and (errno == ENOTEMPTY)
3168
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3169
== 0) and (level == 0)){
3170
/* Recurse only in this special case */
3171
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3174
if((dret == -1) and (errno != ENOENT)){
3175
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3176
direntries[i]->d_name, strerror(errno));
3179
free(direntries[i]);
3182
/* need to clean even if 0 because man page doesn't specify */
3184
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3185
if(dret == -1 and errno != ENOENT){
3186
perror_plus("rmdir");
3189
perror_plus("scandirat");
3194
/* Removes the GPGME temp directory and all files inside */
3195
if(tempdir != NULL){
3196
clean_dir_at(-1, tempdir, 0);
3200
sigemptyset(&old_sigterm_action.sa_mask);
3201
old_sigterm_action.sa_handler = SIG_DFL;
3202
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3203
&old_sigterm_action,
3206
perror_plus("sigaction");
3209
ret = raise(signal_received);
3210
} while(ret != 0 and errno == EINTR);
3212
perror_plus("raise");
3215
TEMP_FAILURE_RETRY(pause());
1035
fprintf(stderr, "%s exiting\n", argv[0]);
1038
/* Cleanup things */
1040
avahi_s_service_browser_free(sb);
1042
if (mc.server != NULL)
1043
avahi_server_free(mc.server);
1045
if (mc.simple_poll != NULL)
1046
avahi_simple_poll_free(mc.simple_poll);
1050
if (gnutls_initalized){
1051
gnutls_certificate_free_credentials(mc.cred);
1052
gnutls_global_deinit ();