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- Committer: Teddy Hogeborn
- Date: 2013-12-15 22:21:28 UTC
- Revision ID: teddy@recompile.se-20131215222128-k6f1wbl6lv4v0kd8
Suppress spurious warnings when needed.
* plugin-runner.c (main): Suppress warning by -Wsign-conversion
generated by FD_SET, FD_CLR and FD_ISSET in
GNU libc before version 2.16.
* plugins.d/mandos-client.c (start_mandos_communication): Suppress
warning by -Wstrict-aliasing generated by IN6_IS_ADDR_LINKLOCAL.
* plugin-runner.c (main): Suppress warning by -Wsign-conversion
generated by FD_SET, FD_CLR and FD_ISSET in
GNU libc before version 2.16.
* plugins.d/mandos-client.c (start_mandos_communication): Suppress
warning by -Wstrict-aliasing generated by IN6_IS_ADDR_LINKLOCAL.
- files added:
- debian/mandos-client.examples
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
64
#include <errno.h> /* perror(), errno,
66
65
program_invocation_short_name */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
75
setgid(), pause(), _exit() */
77
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
85
84
raise() */
86
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
88
94
89
95
#ifdef __linux__
90
96
#include <sys/klog.h> /* klogctl() */
108
114
init_gnutls_session(),
109
115
GNUTLS_* */
110
116
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
113
119
114
120
/* GPGME */
115
121
#include <gpgme.h> /* All GPGME types, constants and
123
129
#define PATHDIR "/conf/conf.d/mandos"
124
130
#define SECKEY "seckey.txt"
125
131
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
126
133
127
134
bool debug = false;
128
135
static const char mandos_protocol_version[] = "1";
129
136
const char *argp_program_version = "mandos-client " VERSION;
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
131
138
static const char sys_class_net[] = "/sys/class/net";
132
139
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
133
143
134
144
/* Doubly linked list that need to be circularly linked when used */
135
145
typedef struct server{
136
146
const char *ip;
137
uint16_t port;
147
in_port_t port;
138
148
AvahiIfIndex if_index;
139
149
int af;
140
150
struct timespec last_seen;
144
154
145
155
/* Used for passing in values through the Avahi callback functions */
146
156
typedef struct {
147
AvahiSimplePoll *simple_poll;
148
157
AvahiServer *server;
149
158
gnutls_certificate_credentials_t cred;
150
159
unsigned int dh_bits;
152
161
const char *priority;
153
162
gpgme_ctx_t ctx;
154
163
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
155
166
} mandos_context;
156
167
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
162
170
163
171
sig_atomic_t quit_now = 0;
164
172
int signal_received = 0;
165
173
166
174
/* Function to use when printing errors */
167
175
void perror_plus(const char *print_text){
176
int e = errno;
168
177
fprintf(stderr, "Mandos plugin %s: ",
169
178
program_invocation_short_name);
179
errno = e;
170
180
perror(print_text);
171
181
}
172
182
183
__attribute__((format (gnu_printf, 2, 3)))
184
int fprintf_plus(FILE *stream, const char *format, ...){
185
va_list ap;
186
va_start (ap, format);
187
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
program_invocation_short_name));
190
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
}
192
173
193
/*
174
194
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
195
* bytes. "buffer_capacity" is how much is currently allocated,
176
196
* "buffer_length" is how much is already used.
177
197
*/
178
198
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
199
size_t buffer_capacity){
180
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
202
if(buffer == NULL){
187
207
return buffer_capacity;
188
208
}
189
209
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
210
/* Add server to set of servers to retry periodically */
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
193
213
int ret;
194
214
server *new_server = malloc(sizeof(server));
195
215
if(new_server == NULL){
196
216
perror_plus("malloc");
197
return -1;
217
return false;
198
218
}
199
219
*new_server = (server){ .ip = strdup(ip),
200
.port = port,
201
.if_index = if_index,
202
.af = af };
220
.port = port,
221
.if_index = if_index,
222
.af = af };
203
223
if(new_server->ip == NULL){
204
224
perror_plus("strdup");
205
return -1;
225
return false;
206
226
}
207
/* unique case of first server */
208
if (mc.current_server == NULL){
227
/* Special case of first server */
228
if(*current_server == NULL){
209
229
new_server->next = new_server;
210
230
new_server->prev = new_server;
211
mc.current_server = new_server;
212
/* Placing the new server last in the list */
231
*current_server = new_server;
232
/* Place the new server last in the list */
213
233
} else {
214
new_server->next = mc.current_server;
215
new_server->prev = mc.current_server->prev;
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
216
236
new_server->prev->next = new_server;
217
mc.current_server->prev = new_server;
237
(*current_server)->prev = new_server;
218
238
}
219
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
220
240
if(ret == -1){
221
241
perror_plus("clock_gettime");
222
return -1;
242
return false;
223
243
}
224
return 0;
244
return true;
225
245
}
226
246
227
247
/*
228
248
* Initialize GPGME.
229
249
*/
230
static bool init_gpgme(const char *seckey,
231
const char *pubkey, const char *tempdir){
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
232
252
gpgme_error_t rc;
233
253
gpgme_engine_info_t engine_info;
234
254
235
236
255
/*
237
256
* Helper function to insert pub and seckey to the engine keyring.
238
257
*/
249
268
250
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
251
270
if(rc != GPG_ERR_NO_ERROR){
252
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
253
gpgme_strsource(rc), gpgme_strerror(rc));
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
254
273
return false;
255
274
}
256
275
257
rc = gpgme_op_import(mc.ctx, pgp_data);
276
rc = gpgme_op_import(mc->ctx, pgp_data);
258
277
if(rc != GPG_ERR_NO_ERROR){
259
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
260
gpgme_strsource(rc), gpgme_strerror(rc));
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
261
280
return false;
262
281
}
263
282
270
289
}
271
290
272
291
if(debug){
273
fprintf(stderr, "Initializing GPGME\n");
292
fprintf_plus(stderr, "Initializing GPGME\n");
274
293
}
275
294
276
295
/* Init GPGME */
277
296
gpgme_check_version(NULL);
278
297
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
279
298
if(rc != GPG_ERR_NO_ERROR){
280
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
282
301
return false;
283
302
}
284
303
285
/* Set GPGME home directory for the OpenPGP engine only */
304
/* Set GPGME home directory for the OpenPGP engine only */
286
305
rc = gpgme_get_engine_info(&engine_info);
287
306
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
290
309
return false;
291
310
}
292
311
while(engine_info != NULL){
298
317
engine_info = engine_info->next;
299
318
}
300
319
if(engine_info == NULL){
301
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
302
322
return false;
303
323
}
304
324
305
325
/* Create new GPGME "context" */
306
rc = gpgme_new(&(mc.ctx));
326
rc = gpgme_new(&(mc->ctx));
307
327
if(rc != GPG_ERR_NO_ERROR){
308
fprintf(stderr, "bad gpgme_new: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
310
331
return false;
311
332
}
312
333
323
344
*/
324
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
325
346
size_t crypto_size,
326
char **plaintext){
347
char **plaintext,
348
mandos_context *mc){
327
349
gpgme_data_t dh_crypto, dh_plain;
328
350
gpgme_error_t rc;
329
351
ssize_t ret;
331
353
ssize_t plaintext_length = 0;
332
354
333
355
if(debug){
334
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
335
357
}
336
358
337
359
/* Create new GPGME data buffer from memory cryptotext */
338
360
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
339
361
0);
340
362
if(rc != GPG_ERR_NO_ERROR){
341
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
342
gpgme_strsource(rc), gpgme_strerror(rc));
363
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
343
365
return -1;
344
366
}
345
367
346
368
/* Create new empty GPGME data buffer for the plaintext */
347
369
rc = gpgme_data_new(&dh_plain);
348
370
if(rc != GPG_ERR_NO_ERROR){
349
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
350
gpgme_strsource(rc), gpgme_strerror(rc));
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
373
gpgme_strsource(rc), gpgme_strerror(rc));
351
374
gpgme_data_release(dh_crypto);
352
375
return -1;
353
376
}
354
377
355
378
/* Decrypt data from the cryptotext data buffer to the plaintext
356
379
data buffer */
357
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
358
381
if(rc != GPG_ERR_NO_ERROR){
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
361
384
plaintext_length = -1;
362
385
if(debug){
363
386
gpgme_decrypt_result_t result;
364
result = gpgme_op_decrypt_result(mc.ctx);
387
result = gpgme_op_decrypt_result(mc->ctx);
365
388
if(result == NULL){
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
367
390
} else {
368
fprintf(stderr, "Unsupported algorithm: %s\n",
369
result->unsupported_algorithm);
370
fprintf(stderr, "Wrong key usage: %u\n",
371
result->wrong_key_usage);
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
result->wrong_key_usage);
372
395
if(result->file_name != NULL){
373
fprintf(stderr, "File name: %s\n", result->file_name);
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
374
397
}
375
398
gpgme_recipient_t recipient;
376
399
recipient = result->recipients;
377
400
while(recipient != NULL){
378
fprintf(stderr, "Public key algorithm: %s\n",
379
gpgme_pubkey_algo_name(recipient->pubkey_algo));
380
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
381
fprintf(stderr, "Secret key available: %s\n",
382
recipient->status == GPG_ERR_NO_SECKEY
383
? "No" : "Yes");
401
fprintf_plus(stderr, "Public key algorithm: %s\n",
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
405
fprintf_plus(stderr, "Secret key available: %s\n",
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
384
408
recipient = recipient->next;
385
409
}
386
410
}
389
413
}
390
414
391
415
if(debug){
392
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
416
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
393
417
}
394
418
395
419
/* Seek back to the beginning of the GPGME plaintext data buffer */
402
426
*plaintext = NULL;
403
427
while(true){
404
428
plaintext_capacity = incbuffer(plaintext,
405
(size_t)plaintext_length,
406
plaintext_capacity);
429
(size_t)plaintext_length,
430
plaintext_capacity);
407
431
if(plaintext_capacity == 0){
408
perror_plus("incbuffer");
409
plaintext_length = -1;
410
goto decrypt_end;
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
411
435
}
412
436
413
437
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
426
450
}
427
451
428
452
if(debug){
429
fprintf(stderr, "Decrypted password is: ");
453
fprintf_plus(stderr, "Decrypted password is: ");
430
454
for(ssize_t i = 0; i < plaintext_length; i++){
431
455
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
432
456
}
444
468
}
445
469
446
470
static const char * safer_gnutls_strerror(int value){
447
const char *ret = gnutls_strerror(value); /* Spurious warning from
448
-Wunreachable-code */
471
const char *ret = gnutls_strerror(value);
449
472
if(ret == NULL)
450
473
ret = "(unknown)";
451
474
return ret;
454
477
/* GnuTLS log function callback */
455
478
static void debuggnutls(__attribute__((unused)) int level,
456
479
const char* string){
457
fprintf(stderr, "GnuTLS: %s", string);
480
fprintf_plus(stderr, "GnuTLS: %s", string);
458
481
}
459
482
460
483
static int init_gnutls_global(const char *pubkeyfilename,
461
const char *seckeyfilename){
484
const char *seckeyfilename,
485
mandos_context *mc){
462
486
int ret;
463
487
464
488
if(debug){
465
fprintf(stderr, "Initializing GnuTLS\n");
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
466
490
}
467
491
468
492
ret = gnutls_global_init();
469
493
if(ret != GNUTLS_E_SUCCESS){
470
fprintf(stderr, "GnuTLS global_init: %s\n",
471
safer_gnutls_strerror(ret));
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
472
496
return -1;
473
497
}
474
498
481
505
}
482
506
483
507
/* OpenPGP credentials */
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
485
509
if(ret != GNUTLS_E_SUCCESS){
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
safer_gnutls_strerror(ret));
488
512
gnutls_global_deinit();
489
513
return -1;
490
514
}
491
515
492
516
if(debug){
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
519
pubkeyfilename,
520
seckeyfilename);
496
521
}
497
522
498
523
ret = gnutls_certificate_set_openpgp_key_file
499
(mc.cred, pubkeyfilename, seckeyfilename,
524
(mc->cred, pubkeyfilename, seckeyfilename,
500
525
GNUTLS_OPENPGP_FMT_BASE64);
501
526
if(ret != GNUTLS_E_SUCCESS){
502
fprintf(stderr,
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
505
fprintf(stderr, "The GnuTLS error is: %s\n",
506
safer_gnutls_strerror(ret));
527
fprintf_plus(stderr,
528
"Error[%d] while reading the OpenPGP key pair ('%s',"
529
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
530
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
531
safer_gnutls_strerror(ret));
507
532
goto globalfail;
508
533
}
509
534
510
535
/* GnuTLS server initialization */
511
ret = gnutls_dh_params_init(&mc.dh_params);
536
ret = gnutls_dh_params_init(&mc->dh_params);
512
537
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
" initialization: %s\n",
540
safer_gnutls_strerror(ret));
515
541
goto globalfail;
516
542
}
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
518
544
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
521
547
goto globalfail;
522
548
}
523
549
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
525
551
526
552
return 0;
527
553
528
554
globalfail:
529
555
530
gnutls_certificate_free_credentials(mc.cred);
556
gnutls_certificate_free_credentials(mc->cred);
531
557
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
558
gnutls_dh_params_deinit(mc->dh_params);
533
559
return -1;
534
560
}
535
561
536
static int init_gnutls_session(gnutls_session_t *session){
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
537
564
int ret;
538
565
/* GnuTLS session creation */
539
566
do {
543
570
}
544
571
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
545
572
if(ret != GNUTLS_E_SUCCESS){
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
548
576
}
549
577
550
578
{
551
579
const char *err;
552
580
do {
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
554
582
if(quit_now){
555
583
gnutls_deinit(*session);
556
584
return -1;
557
585
}
558
586
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
559
587
if(ret != GNUTLS_E_SUCCESS){
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
safer_gnutls_strerror(ret));
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
563
591
gnutls_deinit(*session);
564
592
return -1;
565
593
}
567
595
568
596
do {
569
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
570
mc.cred);
598
mc->cred);
571
599
if(quit_now){
572
600
gnutls_deinit(*session);
573
601
return -1;
574
602
}
575
603
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
576
604
if(ret != GNUTLS_E_SUCCESS){
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
579
607
gnutls_deinit(*session);
580
608
return -1;
581
609
}
583
611
/* ignore client certificate if any. */
584
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
585
613
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
587
615
588
616
return 0;
589
617
}
593
621
__attribute__((unused)) const char *txt){}
594
622
595
623
/* Called when a Mandos server is found */
596
static int start_mandos_communication(const char *ip, uint16_t port,
624
static int start_mandos_communication(const char *ip, in_port_t port,
597
625
AvahiIfIndex if_index,
598
int af){
626
int af, mandos_context *mc){
599
627
int ret, tcp_sd = -1;
600
628
ssize_t sret;
601
629
union {
626
654
pf = PF_INET;
627
655
break;
628
656
default:
629
fprintf(stderr, "Bad address family: %d\n", af);
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
658
errno = EINVAL;
631
659
return -1;
632
660
}
633
661
634
ret = init_gnutls_session(&session);
662
/* If the interface is specified and we have a list of interfaces */
663
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
664
/* Check if the interface is one of the interfaces we are using */
665
bool match = false;
666
{
667
char *interface = NULL;
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
670
if(if_nametoindex(interface) == (unsigned int)if_index){
671
match = true;
672
break;
673
}
674
}
675
}
676
if(not match){
677
/* This interface does not match any in the list, so we don't
678
connect to the server */
679
if(debug){
680
char interface[IF_NAMESIZE];
681
if(if_indextoname((unsigned int)if_index, interface) == NULL){
682
perror_plus("if_indextoname");
683
} else {
684
fprintf_plus(stderr, "Skipping server on non-used interface"
685
" \"%s\"\n",
686
if_indextoname((unsigned int)if_index,
687
interface));
688
}
689
}
690
return -1;
691
}
692
}
693
694
ret = init_gnutls_session(&session, mc);
635
695
if(ret != 0){
636
696
return -1;
637
697
}
638
698
639
699
if(debug){
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
700
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
701
PRIuMAX "\n", ip, (uintmax_t)port);
642
702
}
643
703
644
704
tcp_sd = socket(pf, SOCK_STREAM, 0);
670
730
}
671
731
if(ret == 0){
672
732
int e = errno;
673
fprintf(stderr, "Bad address: %s\n", ip);
733
fprintf_plus(stderr, "Bad address: %s\n", ip);
674
734
errno = e;
675
735
goto mandos_end;
676
736
}
677
737
if(af == AF_INET6){
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
-Wconversion and
680
-Wunreachable-code */
681
738
to.in6.sin6_port = htons(port);
739
#ifdef __GNUC__
740
#pragma GCC diagnostic push
741
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
742
#endif
682
743
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
744
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
745
#ifdef __GNUC__
746
#pragma GCC diagnostic pop
747
#endif
685
748
if(if_index == AVAHI_IF_UNSPEC){
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
749
fprintf_plus(stderr, "An IPv6 link-local address is"
750
" incomplete without a network interface\n");
688
751
errno = EINVAL;
689
752
goto mandos_end;
690
753
}
692
755
to.in6.sin6_scope_id = (uint32_t)if_index;
693
756
}
694
757
} else {
695
to.in.sin_port = htons(port); /* Spurious warnings from
696
-Wconversion and
697
-Wunreachable-code */
758
to.in.sin_port = htons(port);
698
759
}
699
760
700
761
if(quit_now){
708
769
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
770
perror_plus("if_indextoname");
710
771
} else {
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
772
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
773
"\n", ip, interface, (uintmax_t)port);
713
774
}
714
775
} else {
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
776
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
777
ip, (uintmax_t)port);
717
778
}
718
779
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
780
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
729
790
perror_plus("inet_ntop");
730
791
} else {
731
792
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
793
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
733
794
}
734
795
}
735
796
}
763
824
while(true){
764
825
size_t out_size = strlen(out);
765
826
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
out_size - written));
827
out_size - written));
767
828
if(ret == -1){
768
829
int e = errno;
769
830
perror_plus("write");
789
850
}
790
851
791
852
if(debug){
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
853
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
793
854
}
794
855
795
856
if(quit_now){
797
858
goto mandos_end;
798
859
}
799
860
800
/* Spurious warning from -Wint-to-pointer-cast */
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
861
/* This casting via intptr_t is to eliminate warning about casting
862
an int to a pointer type. This is exactly how the GnuTLS Guile
863
function "set-session-transport-fd!" does it. */
864
gnutls_transport_set_ptr(session,
865
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
802
866
803
867
if(quit_now){
804
868
errno = EINTR;
815
879
816
880
if(ret != GNUTLS_E_SUCCESS){
817
881
if(debug){
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
882
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
819
883
gnutls_perror(ret);
820
884
}
821
885
errno = EPROTO;
825
889
/* Read OpenPGP packet that contains the wanted password */
826
890
827
891
if(debug){
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
892
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
893
" %s\n", ip);
830
894
}
831
895
832
896
while(true){
837
901
}
838
902
839
903
buffer_capacity = incbuffer(&buffer, buffer_length,
840
buffer_capacity);
904
buffer_capacity);
841
905
if(buffer_capacity == 0){
842
906
int e = errno;
843
907
perror_plus("incbuffer");
870
934
}
871
935
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
872
936
if(ret < 0){
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
937
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
938
"***\n");
874
939
gnutls_perror(ret);
875
940
errno = EPROTO;
876
941
goto mandos_end;
877
942
}
878
943
break;
879
944
default:
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
945
fprintf_plus(stderr, "Unknown error while reading data from"
946
" encrypted session with Mandos server\n");
882
947
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
948
errno = EIO;
884
949
goto mandos_end;
889
954
}
890
955
891
956
if(debug){
892
fprintf(stderr, "Closing TLS session\n");
957
fprintf_plus(stderr, "Closing TLS session\n");
893
958
}
894
959
895
960
if(quit_now){
907
972
908
973
if(buffer_length > 0){
909
974
ssize_t decrypted_buffer_size;
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
912
&decrypted_buffer);
975
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
976
&decrypted_buffer, mc);
913
977
if(decrypted_buffer_size >= 0){
914
978
915
979
written = 0;
925
989
if(ret == 0 and ferror(stdout)){
926
990
int e = errno;
927
991
if(debug){
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
992
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
993
strerror(errno));
930
994
}
931
995
errno = e;
932
996
goto mandos_end;
976
1040
AVAHI_GCC_UNUSED AvahiStringList *txt,
977
1041
AVAHI_GCC_UNUSED AvahiLookupResultFlags
978
1042
flags,
979
AVAHI_GCC_UNUSED void* userdata){
980
assert(r);
1043
void* mc){
1044
if(r == NULL){
1045
return;
1046
}
981
1047
982
1048
/* Called whenever a service has been resolved successfully or
983
1049
timed out */
989
1055
switch(event){
990
1056
default:
991
1057
case AVAHI_RESOLVER_FAILURE:
992
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
993
" of type '%s' in domain '%s': %s\n", name, type, domain,
994
avahi_strerror(avahi_server_errno(mc.server)));
1058
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1059
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1060
domain,
1061
avahi_strerror(avahi_server_errno
1062
(((mandos_context*)mc)->server)));
995
1063
break;
996
1064
997
1065
case AVAHI_RESOLVER_FOUND:
999
1067
char ip[AVAHI_ADDRESS_STR_MAX];
1000
1068
avahi_address_snprint(ip, sizeof(ip), address);
1001
1069
if(debug){
1002
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
ip, (intmax_t)interface, port);
1070
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1071
PRIdMAX ") on port %" PRIu16 "\n", name,
1072
host_name, ip, (intmax_t)interface, port);
1005
1073
}
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
1074
int ret = start_mandos_communication(ip, (in_port_t)port,
1075
interface,
1076
avahi_proto_to_af(proto),
1077
mc);
1008
1078
if(ret == 0){
1009
avahi_simple_poll_quit(mc.simple_poll);
1079
avahi_simple_poll_quit(simple_poll);
1010
1080
} else {
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1081
if(not add_server(ip, (in_port_t)port, interface,
1082
avahi_proto_to_af(proto),
1083
&((mandos_context*)mc)->current_server)){
1084
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1085
" list\n", name);
1086
}
1013
1087
}
1014
1088
}
1015
1089
}
1025
1099
const char *domain,
1026
1100
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1027
1101
flags,
1028
AVAHI_GCC_UNUSED void* userdata){
1029
assert(b);
1102
void* mc){
1103
if(b == NULL){
1104
return;
1105
}
1030
1106
1031
1107
/* Called whenever a new services becomes available on the LAN or
1032
1108
is removed from the LAN */
1039
1115
default:
1040
1116
case AVAHI_BROWSER_FAILURE:
1041
1117
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
1118
fprintf_plus(stderr, "(Avahi browser) %s\n",
1119
avahi_strerror(avahi_server_errno
1120
(((mandos_context*)mc)->server)));
1121
avahi_simple_poll_quit(simple_poll);
1045
1122
return;
1046
1123
1047
1124
case AVAHI_BROWSER_NEW:
1050
1127
the callback function is called the Avahi server will free the
1051
1128
resolver for us. */
1052
1129
1053
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
name, type, domain, protocol, 0,
1055
resolve_callback, NULL) == NULL)
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
1130
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1131
interface, protocol, name, type,
1132
domain, protocol, 0,
1133
resolve_callback, mc) == NULL)
1134
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1135
" %s\n", name,
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1058
1138
break;
1059
1139
1060
1140
case AVAHI_BROWSER_REMOVE:
1063
1143
case AVAHI_BROWSER_ALL_FOR_NOW:
1064
1144
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1065
1145
if(debug){
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1146
fprintf_plus(stderr, "No Mandos server found, still"
1147
" searching...\n");
1067
1148
}
1068
1149
break;
1069
1150
}
1078
1159
signal_received = sig;
1079
1160
int old_errno = errno;
1080
1161
/* set main loop to exit */
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1162
if(simple_poll != NULL){
1163
avahi_simple_poll_quit(simple_poll);
1083
1164
}
1084
1165
errno = old_errno;
1085
1166
}
1086
1167
1168
bool get_flags(const char *ifname, struct ifreq *ifr){
1169
int ret;
1170
error_t ret_errno;
1171
1172
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1173
if(s < 0){
1174
ret_errno = errno;
1175
perror_plus("socket");
1176
errno = ret_errno;
1177
return false;
1178
}
1179
strcpy(ifr->ifr_name, ifname);
1180
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1181
if(ret == -1){
1182
if(debug){
1183
ret_errno = errno;
1184
perror_plus("ioctl SIOCGIFFLAGS");
1185
errno = ret_errno;
1186
}
1187
return false;
1188
}
1189
return true;
1190
}
1191
1192
bool good_flags(const char *ifname, const struct ifreq *ifr){
1193
1194
/* Reject the loopback device */
1195
if(ifr->ifr_flags & IFF_LOOPBACK){
1196
if(debug){
1197
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1198
ifname);
1199
}
1200
return false;
1201
}
1202
/* Accept point-to-point devices only if connect_to is specified */
1203
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1204
if(debug){
1205
fprintf_plus(stderr, "Accepting point-to-point interface"
1206
" \"%s\"\n", ifname);
1207
}
1208
return true;
1209
}
1210
/* Otherwise, reject non-broadcast-capable devices */
1211
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1212
if(debug){
1213
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1214
" \"%s\"\n", ifname);
1215
}
1216
return false;
1217
}
1218
/* Reject non-ARP interfaces (including dummy interfaces) */
1219
if(ifr->ifr_flags & IFF_NOARP){
1220
if(debug){
1221
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1222
ifname);
1223
}
1224
return false;
1225
}
1226
1227
/* Accept this device */
1228
if(debug){
1229
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1230
}
1231
return true;
1232
}
1233
1087
1234
/*
1088
1235
* This function determines if a directory entry in /sys/class/net
1089
1236
* corresponds to an acceptable network device.
1090
1237
* (This function is passed to scandir(3) as a filter function.)
1091
1238
*/
1092
1239
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
1240
if(if_entry->d_name[0] == '.'){
1096
1241
return 0;
1097
1242
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1143
if(debug){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1146
}
1147
free(flagstring);
1148
return 0;
1149
}
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1152
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1157
}
1158
return 0;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1165
}
1166
return 1;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1173
}
1174
return 0;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1178
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1181
}
1182
return 0;
1183
}
1184
/* Accept this device */
1185
if(debug){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1243
1244
struct ifreq ifr;
1245
if(not get_flags(if_entry->d_name, &ifr)){
1246
if(debug){
1247
fprintf_plus(stderr, "Failed to get flags for interface "
1248
"\"%s\"\n", if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
if(not good_flags(if_entry->d_name, &ifr)){
1254
return 0;
1188
1255
}
1189
1256
return 1;
1190
1257
}
1191
1258
1259
/*
1260
* This function determines if a network interface is up.
1261
*/
1262
bool interface_is_up(const char *interface){
1263
struct ifreq ifr;
1264
if(not get_flags(interface, &ifr)){
1265
if(debug){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", interface);
1268
}
1269
return false;
1270
}
1271
1272
return (bool)(ifr.ifr_flags & IFF_UP);
1273
}
1274
1275
/*
1276
* This function determines if a network interface is running
1277
*/
1278
bool interface_is_running(const char *interface){
1279
struct ifreq ifr;
1280
if(not get_flags(interface, &ifr)){
1281
if(debug){
1282
fprintf_plus(stderr, "Failed to get flags for interface "
1283
"\"%s\"\n", interface);
1284
}
1285
return false;
1286
}
1287
1288
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1289
}
1290
1192
1291
int notdotentries(const struct dirent *direntry){
1193
1292
/* Skip "." and ".." */
1194
1293
if(direntry->d_name[0] == '.'
1200
1299
return 1;
1201
1300
}
1202
1301
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1302
/* Is this directory entry a runnable program? */
1303
int runnable_hook(const struct dirent *direntry){
1304
int ret;
1305
size_t sret;
1306
struct stat st;
1307
1308
if((direntry->d_name)[0] == '\0'){
1309
/* Empty name? */
1310
return 0;
1311
}
1312
1313
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1314
"abcdefghijklmnopqrstuvwxyz"
1315
"0123456789"
1316
"_-");
1317
if((direntry->d_name)[sret] != '\0'){
1318
/* Contains non-allowed characters */
1319
if(debug){
1320
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1321
direntry->d_name);
1322
}
1323
return 0;
1324
}
1325
1326
char *fullname = NULL;
1327
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1328
if(ret < 0){
1329
perror_plus("asprintf");
1330
return 0;
1331
}
1332
1333
ret = stat(fullname, &st);
1334
if(ret == -1){
1335
if(debug){
1336
perror_plus("Could not stat hook");
1337
}
1338
return 0;
1339
}
1340
if(not (S_ISREG(st.st_mode))){
1341
/* Not a regular file */
1342
if(debug){
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1344
direntry->d_name);
1345
}
1346
return 0;
1347
}
1348
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1349
/* Not executable */
1350
if(debug){
1351
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1352
direntry->d_name);
1353
}
1354
return 0;
1355
}
1356
if(debug){
1357
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1358
direntry->d_name);
1359
}
1360
return 1;
1361
}
1362
1363
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1364
mandos_context *mc){
1204
1365
int ret;
1205
1366
struct timespec now;
1206
1367
struct timespec waited_time;
1207
1368
intmax_t block_time;
1208
1369
1209
1370
while(true){
1210
if(mc.current_server == NULL){
1371
if(mc->current_server == NULL){
1211
1372
if (debug){
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1373
fprintf_plus(stderr, "Wait until first server is found."
1374
" No timeout!\n");
1214
1375
}
1215
1376
ret = avahi_simple_poll_iterate(s, -1);
1216
1377
} else {
1217
1378
if (debug){
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1379
fprintf_plus(stderr, "Check current_server if we should run"
1380
" it, or wait\n");
1220
1381
}
1221
1382
/* the current time */
1222
1383
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1227
1388
/* Calculating in ms how long time between now and server
1228
1389
who we visted longest time ago. Now - last seen. */
1229
1390
waited_time.tv_sec = (now.tv_sec
1230
- mc.current_server->last_seen.tv_sec);
1391
- mc->current_server->last_seen.tv_sec);
1231
1392
waited_time.tv_nsec = (now.tv_nsec
1232
- mc.current_server->last_seen.tv_nsec);
1393
- mc->current_server->last_seen.tv_nsec);
1233
1394
/* total time is 10s/10,000ms.
1234
1395
Converting to s from ms by dividing by 1,000,
1235
1396
and ns to ms by dividing by 1,000,000. */
1236
1397
block_time = ((retry_interval
1237
1398
- ((intmax_t)waited_time.tv_sec * 1000))
1238
1399
- ((intmax_t)waited_time.tv_nsec / 1000000));
1239
1400
1240
1401
if (debug){
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1402
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1403
block_time);
1242
1404
}
1243
1405
1244
1406
if(block_time <= 0){
1245
ret = start_mandos_communication(mc.current_server->ip,
1246
mc.current_server->port,
1247
mc.current_server->if_index,
1248
mc.current_server->af);
1407
ret = start_mandos_communication(mc->current_server->ip,
1408
mc->current_server->port,
1409
mc->current_server->if_index,
1410
mc->current_server->af, mc);
1249
1411
if(ret == 0){
1250
avahi_simple_poll_quit(mc.simple_poll);
1412
avahi_simple_poll_quit(s);
1251
1413
return 0;
1252
1414
}
1253
1415
ret = clock_gettime(CLOCK_MONOTONIC,
1254
&mc.current_server->last_seen);
1416
&mc->current_server->last_seen);
1255
1417
if(ret == -1){
1256
1418
perror_plus("clock_gettime");
1257
1419
return -1;
1258
1420
}
1259
mc.current_server = mc.current_server->next;
1421
mc->current_server = mc->current_server->next;
1260
1422
block_time = 0; /* Call avahi to find new Mandos
1261
1423
servers, but don't block */
1262
1424
}
1264
1426
ret = avahi_simple_poll_iterate(s, (int)block_time);
1265
1427
}
1266
1428
if(ret != 0){
1267
if (ret > 0 or errno != EINTR) {
1429
if (ret > 0 or errno != EINTR){
1268
1430
return (ret != 1) ? ret : 0;
1269
1431
}
1270
1432
}
1271
1433
}
1272
1434
}
1273
1435
1436
/* Set effective uid to 0, return errno */
1437
error_t raise_privileges(void){
1438
error_t old_errno = errno;
1439
error_t ret_errno = 0;
1440
if(seteuid(0) == -1){
1441
ret_errno = errno;
1442
perror_plus("seteuid");
1443
}
1444
errno = old_errno;
1445
return ret_errno;
1446
}
1447
1448
/* Set effective and real user ID to 0. Return errno. */
1449
error_t raise_privileges_permanently(void){
1450
error_t old_errno = errno;
1451
error_t ret_errno = raise_privileges();
1452
if(ret_errno != 0){
1453
errno = old_errno;
1454
return ret_errno;
1455
}
1456
if(setuid(0) == -1){
1457
ret_errno = errno;
1458
perror_plus("seteuid");
1459
}
1460
errno = old_errno;
1461
return ret_errno;
1462
}
1463
1464
/* Set effective user ID to unprivileged saved user ID */
1465
error_t lower_privileges(void){
1466
error_t old_errno = errno;
1467
error_t ret_errno = 0;
1468
if(seteuid(uid) == -1){
1469
ret_errno = errno;
1470
perror_plus("seteuid");
1471
}
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
1476
/* Lower privileges permanently */
1477
error_t lower_privileges_permanently(void){
1478
error_t old_errno = errno;
1479
error_t ret_errno = 0;
1480
if(setuid(uid) == -1){
1481
ret_errno = errno;
1482
perror_plus("setuid");
1483
}
1484
errno = old_errno;
1485
return ret_errno;
1486
}
1487
1488
bool run_network_hooks(const char *mode, const char *interface,
1489
const float delay){
1490
struct dirent **direntries;
1491
struct dirent *direntry;
1492
int ret;
1493
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1494
alphasort);
1495
if(numhooks == -1){
1496
if(errno == ENOENT){
1497
if(debug){
1498
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1499
" found\n", hookdir);
1500
}
1501
} else {
1502
perror_plus("scandir");
1503
}
1504
} else {
1505
int devnull = open("/dev/null", O_RDONLY);
1506
for(int i = 0; i < numhooks; i++){
1507
direntry = direntries[i];
1508
char *fullname = NULL;
1509
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1510
if(ret < 0){
1511
perror_plus("asprintf");
1512
continue;
1513
}
1514
if(debug){
1515
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1516
direntry->d_name);
1517
}
1518
pid_t hook_pid = fork();
1519
if(hook_pid == 0){
1520
/* Child */
1521
/* Raise privileges */
1522
raise_privileges_permanently();
1523
/* Set group */
1524
errno = 0;
1525
ret = setgid(0);
1526
if(ret == -1){
1527
perror_plus("setgid");
1528
}
1529
/* Reset supplementary groups */
1530
errno = 0;
1531
ret = setgroups(0, NULL);
1532
if(ret == -1){
1533
perror_plus("setgroups");
1534
}
1535
dup2(devnull, STDIN_FILENO);
1536
close(devnull);
1537
dup2(STDERR_FILENO, STDOUT_FILENO);
1538
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1539
if(ret == -1){
1540
perror_plus("setenv");
1541
_exit(EX_OSERR);
1542
}
1543
ret = setenv("DEVICE", interface, 1);
1544
if(ret == -1){
1545
perror_plus("setenv");
1546
_exit(EX_OSERR);
1547
}
1548
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1549
if(ret == -1){
1550
perror_plus("setenv");
1551
_exit(EX_OSERR);
1552
}
1553
ret = setenv("MODE", mode, 1);
1554
if(ret == -1){
1555
perror_plus("setenv");
1556
_exit(EX_OSERR);
1557
}
1558
char *delaystring;
1559
ret = asprintf(&delaystring, "%f", delay);
1560
if(ret == -1){
1561
perror_plus("asprintf");
1562
_exit(EX_OSERR);
1563
}
1564
ret = setenv("DELAY", delaystring, 1);
1565
if(ret == -1){
1566
free(delaystring);
1567
perror_plus("setenv");
1568
_exit(EX_OSERR);
1569
}
1570
free(delaystring);
1571
if(connect_to != NULL){
1572
ret = setenv("CONNECT", connect_to, 1);
1573
if(ret == -1){
1574
perror_plus("setenv");
1575
_exit(EX_OSERR);
1576
}
1577
}
1578
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1579
perror_plus("execl");
1580
_exit(EXIT_FAILURE);
1581
}
1582
} else {
1583
int status;
1584
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1585
perror_plus("waitpid");
1586
free(fullname);
1587
continue;
1588
}
1589
if(WIFEXITED(status)){
1590
if(WEXITSTATUS(status) != 0){
1591
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1592
" with status %d\n", direntry->d_name,
1593
WEXITSTATUS(status));
1594
free(fullname);
1595
continue;
1596
}
1597
} else if(WIFSIGNALED(status)){
1598
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1599
" signal %d\n", direntry->d_name,
1600
WTERMSIG(status));
1601
free(fullname);
1602
continue;
1603
} else {
1604
fprintf_plus(stderr, "Warning: network hook \"%s\""
1605
" crashed\n", direntry->d_name);
1606
free(fullname);
1607
continue;
1608
}
1609
}
1610
free(fullname);
1611
if(debug){
1612
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1613
direntry->d_name);
1614
}
1615
}
1616
close(devnull);
1617
}
1618
return true;
1619
}
1620
1621
error_t bring_up_interface(const char *const interface,
1622
const float delay){
1623
int sd = -1;
1624
error_t old_errno = errno;
1625
error_t ret_errno = 0;
1626
int ret, ret_setflags;
1627
struct ifreq network;
1628
unsigned int if_index = if_nametoindex(interface);
1629
if(if_index == 0){
1630
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1631
errno = old_errno;
1632
return ENXIO;
1633
}
1634
1635
if(quit_now){
1636
errno = old_errno;
1637
return EINTR;
1638
}
1639
1640
if(not interface_is_up(interface)){
1641
if(not get_flags(interface, &network) and debug){
1642
ret_errno = errno;
1643
fprintf_plus(stderr, "Failed to get flags for interface "
1644
"\"%s\"\n", interface);
1645
return ret_errno;
1646
}
1647
network.ifr_flags |= IFF_UP;
1648
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1651
ret_errno = errno;
1652
perror_plus("socket");
1653
errno = old_errno;
1654
return ret_errno;
1655
}
1656
1657
if(quit_now){
1658
close(sd);
1659
errno = old_errno;
1660
return EINTR;
1661
}
1662
1663
if(debug){
1664
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1665
interface);
1666
}
1667
1668
/* Raise priviliges */
1669
raise_privileges();
1670
1671
#ifdef __linux__
1672
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1673
messages about the network interface to mess up the prompt */
1674
int ret_linux = klogctl(8, NULL, 5);
1675
bool restore_loglevel = true;
1676
if(ret_linux == -1){
1677
restore_loglevel = false;
1678
perror_plus("klogctl");
1679
}
1680
#endif /* __linux__ */
1681
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1682
ret_errno = errno;
1683
#ifdef __linux__
1684
if(restore_loglevel){
1685
ret_linux = klogctl(7, NULL, 0);
1686
if(ret_linux == -1){
1687
perror_plus("klogctl");
1688
}
1689
}
1690
#endif /* __linux__ */
1691
1692
/* Lower privileges */
1693
lower_privileges();
1694
1695
/* Close the socket */
1696
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1697
if(ret == -1){
1698
perror_plus("close");
1699
}
1700
1701
if(ret_setflags == -1){
1702
errno = ret_errno;
1703
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1704
errno = old_errno;
1705
return ret_errno;
1706
}
1707
} else if(debug){
1708
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1709
interface);
1710
}
1711
1712
/* Sleep checking until interface is running.
1713
Check every 0.25s, up to total time of delay */
1714
for(int i=0; i < delay * 4; i++){
1715
if(interface_is_running(interface)){
1716
break;
1717
}
1718
struct timespec sleeptime = { .tv_nsec = 250000000 };
1719
ret = nanosleep(&sleeptime, NULL);
1720
if(ret == -1 and errno != EINTR){
1721
perror_plus("nanosleep");
1722
}
1723
}
1724
1725
errno = old_errno;
1726
return 0;
1727
}
1728
1729
error_t take_down_interface(const char *const interface){
1730
int sd = -1;
1731
error_t old_errno = errno;
1732
error_t ret_errno = 0;
1733
int ret, ret_setflags;
1734
struct ifreq network;
1735
unsigned int if_index = if_nametoindex(interface);
1736
if(if_index == 0){
1737
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1738
errno = old_errno;
1739
return ENXIO;
1740
}
1741
if(interface_is_up(interface)){
1742
if(not get_flags(interface, &network) and debug){
1743
ret_errno = errno;
1744
fprintf_plus(stderr, "Failed to get flags for interface "
1745
"\"%s\"\n", interface);
1746
return ret_errno;
1747
}
1748
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1749
1750
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1751
if(sd < 0){
1752
ret_errno = errno;
1753
perror_plus("socket");
1754
errno = old_errno;
1755
return ret_errno;
1756
}
1757
1758
if(debug){
1759
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1760
interface);
1761
}
1762
1763
/* Raise priviliges */
1764
raise_privileges();
1765
1766
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1767
ret_errno = errno;
1768
1769
/* Lower privileges */
1770
lower_privileges();
1771
1772
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1774
if(ret == -1){
1775
perror_plus("close");
1776
}
1777
1778
if(ret_setflags == -1){
1779
errno = ret_errno;
1780
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1781
errno = old_errno;
1782
return ret_errno;
1783
}
1784
} else if(debug){
1785
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1786
interface);
1787
}
1788
1789
errno = old_errno;
1790
return 0;
1791
}
1792
1274
1793
int main(int argc, char *argv[]){
1794
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1795
.priority = "SECURE256:!CTYPE-X.509:"
1796
"+CTYPE-OPENPGP", .current_server = NULL,
1797
.interfaces = NULL, .interfaces_size = 0 };
1275
1798
AvahiSServiceBrowser *sb = NULL;
1276
int error;
1799
error_t ret_errno;
1277
1800
int ret;
1278
1801
intmax_t tmpmax;
1279
1802
char *tmp;
1280
1803
int exitcode = EXIT_SUCCESS;
1281
const char *interface = "";
1282
struct ifreq network;
1283
int sd = -1;
1284
bool take_down_interface = false;
1285
uid_t uid;
1286
gid_t gid;
1804
char *interfaces_to_take_down = NULL;
1805
size_t interfaces_to_take_down_size = 0;
1287
1806
char tempdir[] = "/tmp/mandosXXXXXX";
1288
1807
bool tempdir_created = false;
1289
1808
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1290
1809
const char *seckey = PATHDIR "/" SECKEY;
1291
1810
const char *pubkey = PATHDIR "/" PUBKEY;
1811
char *interfaces_hooks = NULL;
1812
size_t interfaces_hooks_size = 0;
1292
1813
1293
1814
bool gnutls_initialized = false;
1294
1815
bool gpgme_initialized = false;
1356
1877
.group = 2 },
1357
1878
{ .name = "retry", .key = 132,
1358
1879
.arg = "SECONDS",
1359
.doc = "Retry interval used when denied by the mandos server",
1880
.doc = "Retry interval used when denied by the Mandos server",
1881
.group = 2 },
1882
{ .name = "network-hook-dir", .key = 133,
1883
.arg = "DIR",
1884
.doc = "Directory where network hooks are located",
1360
1885
.group = 2 },
1361
1886
/*
1362
1887
* These reproduce what we would get without ARGP_NO_HELP
1381
1906
connect_to = arg;
1382
1907
break;
1383
1908
case 'i': /* --interface */
1384
interface = arg;
1909
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1910
arg, (int)',');
1911
if(ret_errno != 0){
1912
argp_error(state, "%s", strerror(ret_errno));
1913
}
1385
1914
break;
1386
1915
case 's': /* --seckey */
1387
1916
seckey = arg;
1411
1940
errno = 0;
1412
1941
retry_interval = strtod(arg, &tmp);
1413
1942
if(errno != 0 or tmp == arg or *tmp != '\0'
1414
or (retry_interval * 1000) > INT_MAX){
1943
or (retry_interval * 1000) > INT_MAX
1944
or retry_interval < 0){
1415
1945
argp_error(state, "Bad retry interval");
1416
1946
}
1417
1947
break;
1948
case 133: /* --network-hook-dir */
1949
hookdir = arg;
1950
break;
1418
1951
/*
1419
1952
* These reproduce what we would get without ARGP_NO_HELP
1420
1953
*/
1426
1959
argp_state_help(state, state->out_stream,
1427
1960
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1428
1961
case 'V': /* --version */
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
1962
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1430
1963
exit(argp_err_exit_status);
1431
1964
break;
1432
1965
default:
1459
1992
{
1460
1993
/* Work around Debian bug #633582:
1461
1994
<http://bugs.debian.org/633582> */
1462
struct stat st;
1463
1995
1464
1996
/* Re-raise priviliges */
1465
errno = 0;
1466
ret = seteuid(0);
1467
if(ret == -1){
1468
perror_plus("seteuid");
1469
}
1470
1471
int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1472
if(seckey_fd == -1){
1473
perror_plus("open");
1474
} else {
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1476
if(ret == -1){
1477
perror_plus("fstat");
1478
} else {
1479
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1480
ret = fchown(seckey_fd, uid, gid);
1481
if(ret == -1){
1482
perror_plus("fchown");
1483
}
1484
}
1485
}
1486
TEMP_FAILURE_RETRY(close(seckey_fd));
1487
}
1488
1489
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1490
if(pubkey_fd == -1){
1491
perror_plus("open");
1492
} else {
1493
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1494
if(ret == -1){
1495
perror_plus("fstat");
1496
} else {
1497
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1498
ret = fchown(pubkey_fd, uid, gid);
1499
if(ret == -1){
1500
perror_plus("fchown");
1501
}
1502
}
1503
}
1504
TEMP_FAILURE_RETRY(close(pubkey_fd));
1505
}
1506
1507
/* Lower privileges */
1508
errno = 0;
1509
ret = seteuid(uid);
1510
if(ret == -1){
1511
perror_plus("seteuid");
1997
if(raise_privileges() == 0){
1998
struct stat st;
1999
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2001
int seckey_fd = open(seckey, O_RDONLY);
2002
if(seckey_fd == -1){
2003
perror_plus("open");
2004
} else {
2005
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2006
if(ret == -1){
2007
perror_plus("fstat");
2008
} else {
2009
if(S_ISREG(st.st_mode)
2010
and st.st_uid == 0 and st.st_gid == 0){
2011
ret = fchown(seckey_fd, uid, gid);
2012
if(ret == -1){
2013
perror_plus("fchown");
2014
}
2015
}
2016
}
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2018
}
2019
}
2020
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2023
if(pubkey_fd == -1){
2024
perror_plus("open");
2025
} else {
2026
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2027
if(ret == -1){
2028
perror_plus("fstat");
2029
} else {
2030
if(S_ISREG(st.st_mode)
2031
and st.st_uid == 0 and st.st_gid == 0){
2032
ret = fchown(pubkey_fd, uid, gid);
2033
if(ret == -1){
2034
perror_plus("fchown");
2035
}
2036
}
2037
}
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2042
/* Lower privileges */
2043
lower_privileges();
2044
}
2045
}
2046
2047
/* Remove invalid interface names (except "none") */
2048
{
2049
char *interface = NULL;
2050
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2051
interface))){
2052
if(strcmp(interface, "none") != 0
2053
and if_nametoindex(interface) == 0){
2054
if(interface[0] != '\0'){
2055
fprintf_plus(stderr, "Not using nonexisting interface"
2056
" \"%s\"\n", interface);
2057
}
2058
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2059
interface = NULL;
2060
}
2061
}
2062
}
2063
2064
/* Run network hooks */
2065
{
2066
if(mc.interfaces != NULL){
2067
interfaces_hooks = malloc(mc.interfaces_size);
2068
if(interfaces_hooks == NULL){
2069
perror_plus("malloc");
2070
goto end;
2071
}
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
interfaces_hooks_size = mc.interfaces_size;
2074
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2075
(int)',');
2076
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2079
goto end;
1512
2080
}
1513
2081
}
1514
2082
1515
2083
if(not debug){
1516
2084
avahi_set_log_function(empty_log);
1517
2085
}
1518
1519
if(interface[0] == '\0'){
1520
struct dirent **direntries;
1521
ret = scandir(sys_class_net, &direntries, good_interface,
1522
alphasort);
1523
if(ret >= 1){
1524
/* Pick the first good interface */
1525
interface = strdup(direntries[0]->d_name);
1526
if(debug){
1527
fprintf(stderr, "Using interface \"%s\"\n", interface);
1528
}
1529
if(interface == NULL){
1530
perror_plus("malloc");
1531
free(direntries);
1532
exitcode = EXIT_FAILURE;
1533
goto end;
1534
}
1535
free(direntries);
1536
} else {
1537
free(direntries);
1538
fprintf(stderr, "Could not find a network interface\n");
1539
exitcode = EXIT_FAILURE;
1540
goto end;
1541
}
1542
}
1543
2086
1544
2087
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1545
2088
from the signal handler */
1546
2089
/* Initialize the pseudo-RNG for Avahi */
1547
2090
srand((unsigned int) time(NULL));
1548
mc.simple_poll = avahi_simple_poll_new();
1549
if(mc.simple_poll == NULL){
1550
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
2093
fprintf_plus(stderr,
2094
"Avahi: Failed to create simple poll object.\n");
1551
2095
exitcode = EX_UNAVAILABLE;
1552
2096
goto end;
1553
2097
}
1615
2159
}
1616
2160
}
1617
2161
1618
/* If the interface is down, bring it up */
1619
if(strcmp(interface, "none") != 0){
1620
if_index = (AvahiIfIndex) if_nametoindex(interface);
1621
if(if_index == 0){
1622
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1623
exitcode = EX_UNAVAILABLE;
1624
goto end;
1625
}
1626
1627
if(quit_now){
1628
goto end;
1629
}
1630
1631
/* Re-raise priviliges */
1632
errno = 0;
1633
ret = seteuid(0);
1634
if(ret == -1){
1635
perror_plus("seteuid");
1636
}
1637
1638
#ifdef __linux__
1639
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1640
messages about the network interface to mess up the prompt */
1641
ret = klogctl(8, NULL, 5);
1642
bool restore_loglevel = true;
1643
if(ret == -1){
1644
restore_loglevel = false;
1645
perror_plus("klogctl");
1646
}
1647
#endif /* __linux__ */
1648
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1651
perror_plus("socket");
1652
exitcode = EX_OSERR;
1653
#ifdef __linux__
1654
if(restore_loglevel){
1655
ret = klogctl(7, NULL, 0);
1656
if(ret == -1){
1657
perror_plus("klogctl");
1658
}
1659
}
1660
#endif /* __linux__ */
1661
/* Lower privileges */
1662
errno = 0;
1663
ret = seteuid(uid);
1664
if(ret == -1){
1665
perror_plus("seteuid");
1666
}
1667
goto end;
1668
}
1669
strcpy(network.ifr_name, interface);
1670
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1671
if(ret == -1){
1672
perror_plus("ioctl SIOCGIFFLAGS");
1673
#ifdef __linux__
1674
if(restore_loglevel){
1675
ret = klogctl(7, NULL, 0);
1676
if(ret == -1){
1677
perror_plus("klogctl");
1678
}
1679
}
1680
#endif /* __linux__ */
1681
exitcode = EX_OSERR;
1682
/* Lower privileges */
1683
errno = 0;
1684
ret = seteuid(uid);
1685
if(ret == -1){
1686
perror_plus("seteuid");
1687
}
1688
goto end;
1689
}
1690
if((network.ifr_flags & IFF_UP) == 0){
1691
network.ifr_flags |= IFF_UP;
1692
take_down_interface = true;
1693
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1694
if(ret == -1){
1695
take_down_interface = false;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
exitcode = EX_OSERR;
1698
#ifdef __linux__
1699
if(restore_loglevel){
1700
ret = klogctl(7, NULL, 0);
1701
if(ret == -1){
1702
perror_plus("klogctl");
2162
/* If no interfaces were specified, make a list */
2163
if(mc.interfaces == NULL){
2164
struct dirent **direntries;
2165
/* Look for any good interfaces */
2166
ret = scandir(sys_class_net, &direntries, good_interface,
2167
alphasort);
2168
if(ret >= 1){
2169
/* Add all found interfaces to interfaces list */
2170
for(int i = 0; i < ret; ++i){
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2172
direntries[i]->d_name);
2173
if(ret_errno != 0){
2174
perror_plus("argz_add");
2175
continue;
2176
}
2177
if(debug){
2178
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2179
direntries[i]->d_name);
2180
}
2181
}
2182
free(direntries);
2183
} else {
2184
free(direntries);
2185
fprintf_plus(stderr, "Could not find a network interface\n");
2186
exitcode = EXIT_FAILURE;
2187
goto end;
2188
}
2189
}
2190
2191
/* Bring up interfaces which are down, and remove any "none"s */
2192
{
2193
char *interface = NULL;
2194
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2195
interface))){
2196
/* If interface name is "none", stop bringing up interfaces.
2197
Also remove all instances of "none" from the list */
2198
if(strcmp(interface, "none") == 0){
2199
argz_delete(&mc.interfaces, &mc.interfaces_size,
2200
interface);
2201
interface = NULL;
2202
while((interface = argz_next(mc.interfaces,
2203
mc.interfaces_size, interface))){
2204
if(strcmp(interface, "none") == 0){
2205
argz_delete(&mc.interfaces, &mc.interfaces_size,
2206
interface);
2207
interface = NULL;
1703
2208
}
1704
2209
}
1705
#endif /* __linux__ */
1706
/* Lower privileges */
1707
errno = 0;
1708
ret = seteuid(uid);
1709
if(ret == -1){
1710
perror_plus("seteuid");
1711
}
1712
goto end;
1713
}
1714
}
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1719
if(ret == -1){
1720
perror_plus("ioctl SIOCGIFFLAGS");
1721
} else if(network.ifr_flags & IFF_RUNNING){
1722
2210
break;
1723
2211
}
1724
struct timespec sleeptime = { .tv_nsec = 250000000 };
1725
ret = nanosleep(&sleeptime, NULL);
1726
if(ret == -1 and errno != EINTR){
1727
perror_plus("nanosleep");
1728
}
1729
}
1730
if(not take_down_interface){
1731
/* We won't need the socket anymore */
1732
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1733
if(ret == -1){
1734
perror_plus("close");
1735
}
1736
}
1737
#ifdef __linux__
1738
if(restore_loglevel){
1739
/* Restores kernel loglevel to default */
1740
ret = klogctl(7, NULL, 0);
1741
if(ret == -1){
1742
perror_plus("klogctl");
1743
}
1744
}
1745
#endif /* __linux__ */
1746
/* Lower privileges */
1747
errno = 0;
1748
if(take_down_interface){
1749
/* Lower privileges */
1750
ret = seteuid(uid);
1751
if(ret == -1){
1752
perror_plus("seteuid");
1753
}
1754
} else {
1755
/* Lower privileges permanently */
1756
ret = setuid(uid);
1757
if(ret == -1){
1758
perror_plus("setuid");
1759
}
1760
}
2212
bool interface_was_up = interface_is_up(interface);
2213
ret = bring_up_interface(interface, delay);
2214
if(not interface_was_up){
2215
if(ret != 0){
2216
errno = ret;
2217
perror_plus("Failed to bring up interface");
2218
} else {
2219
ret_errno = argz_add(&interfaces_to_take_down,
2220
&interfaces_to_take_down_size,
2221
interface);
2222
}
2223
}
2224
}
2225
if(debug and (interfaces_to_take_down == NULL)){
2226
fprintf_plus(stderr, "No interfaces were brought up\n");
2227
}
2228
}
2229
2230
/* If we only got one interface, explicitly use only that one */
2231
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2232
if(debug){
2233
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2234
mc.interfaces);
2235
}
2236
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1761
2237
}
1762
2238
1763
2239
if(quit_now){
1764
2240
goto end;
1765
2241
}
1766
2242
1767
ret = init_gnutls_global(pubkey, seckey);
2243
ret = init_gnutls_global(pubkey, seckey, &mc);
1768
2244
if(ret == -1){
1769
fprintf(stderr, "init_gnutls_global failed\n");
2245
fprintf_plus(stderr, "init_gnutls_global failed\n");
1770
2246
exitcode = EX_UNAVAILABLE;
1771
2247
goto end;
1772
2248
} else {
1787
2263
goto end;
1788
2264
}
1789
2265
1790
if(not init_gpgme(pubkey, seckey, tempdir)){
1791
fprintf(stderr, "init_gpgme failed\n");
2266
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2267
fprintf_plus(stderr, "init_gpgme failed\n");
1792
2268
exitcode = EX_UNAVAILABLE;
1793
2269
goto end;
1794
2270
} else {
1803
2279
/* Connect directly, do not use Zeroconf */
1804
2280
/* (Mainly meant for debugging) */
1805
2281
char *address = strrchr(connect_to, ':');
2282
1806
2283
if(address == NULL){
1807
fprintf(stderr, "No colon in address\n");
2284
fprintf_plus(stderr, "No colon in address\n");
1808
2285
exitcode = EX_USAGE;
1809
2286
goto end;
1810
2287
}
1813
2290
goto end;
1814
2291
}
1815
2292
1816
uint16_t port;
2293
in_port_t port;
1817
2294
errno = 0;
1818
2295
tmpmax = strtoimax(address+1, &tmp, 10);
1819
2296
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1820
or tmpmax != (uint16_t)tmpmax){
1821
fprintf(stderr, "Bad port number\n");
2297
or tmpmax != (in_port_t)tmpmax){
2298
fprintf_plus(stderr, "Bad port number\n");
1822
2299
exitcode = EX_USAGE;
1823
2300
goto end;
1824
2301
}
1825
2302
1826
2303
if(quit_now){
1827
2304
goto end;
1828
2305
}
1829
2306
1830
port = (uint16_t)tmpmax;
2307
port = (in_port_t)tmpmax;
1831
2308
*address = '\0';
1832
address = connect_to;
1833
2309
/* Colon in address indicates IPv6 */
1834
2310
int af;
1835
if(strchr(address, ':') != NULL){
2311
if(strchr(connect_to, ':') != NULL){
1836
2312
af = AF_INET6;
2313
/* Accept [] around IPv6 address - see RFC 5952 */
2314
if(connect_to[0] == '[' and address[-1] == ']')
2315
{
2316
connect_to++;
2317
address[-1] = '\0';
2318
}
1837
2319
} else {
1838
2320
af = AF_INET;
1839
2321
}
2322
address = connect_to;
1840
2323
1841
2324
if(quit_now){
1842
2325
goto end;
1843
2326
}
1844
2327
1845
2328
while(not quit_now){
1846
ret = start_mandos_communication(address, port, if_index, af);
2329
ret = start_mandos_communication(address, port, if_index, af,
2330
&mc);
1847
2331
if(quit_now or ret == 0){
1848
2332
break;
1849
2333
}
1850
sleep((int)retry_interval or 1);
1851
};
1852
2334
if(debug){
2335
fprintf_plus(stderr, "Retrying in %d seconds\n",
2336
(int)retry_interval);
2337
}
2338
sleep((unsigned int)retry_interval);
2339
}
2340
1853
2341
if (not quit_now){
1854
2342
exitcode = EXIT_SUCCESS;
1855
2343
}
1856
2344
1857
2345
goto end;
1858
2346
}
1859
2347
1871
2359
config.publish_domain = 0;
1872
2360
1873
2361
/* Allocate a new server */
1874
mc.server = avahi_server_new(avahi_simple_poll_get
1875
(mc.simple_poll), &config, NULL,
1876
NULL, &error);
2362
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2363
&config, NULL, NULL, &ret_errno);
1877
2364
1878
2365
/* Free the Avahi configuration data */
1879
2366
avahi_server_config_free(&config);
1881
2368
1882
2369
/* Check if creating the Avahi server object succeeded */
1883
2370
if(mc.server == NULL){
1884
fprintf(stderr, "Failed to create Avahi server: %s\n",
1885
avahi_strerror(error));
2371
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2372
avahi_strerror(ret_errno));
1886
2373
exitcode = EX_UNAVAILABLE;
1887
2374
goto end;
1888
2375
}
1894
2381
/* Create the Avahi service browser */
1895
2382
sb = avahi_s_service_browser_new(mc.server, if_index,
1896
2383
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1897
NULL, 0, browse_callback, NULL);
2384
NULL, 0, browse_callback,
2385
(void *)&mc);
1898
2386
if(sb == NULL){
1899
fprintf(stderr, "Failed to create service browser: %s\n",
1900
avahi_strerror(avahi_server_errno(mc.server)));
2387
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2388
avahi_strerror(avahi_server_errno(mc.server)));
1901
2389
exitcode = EX_UNAVAILABLE;
1902
2390
goto end;
1903
2391
}
1909
2397
/* Run the main loop */
1910
2398
1911
2399
if(debug){
1912
fprintf(stderr, "Starting Avahi loop search\n");
2400
fprintf_plus(stderr, "Starting Avahi loop search\n");
1913
2401
}
1914
2402
1915
ret = avahi_loop_with_timeout(mc.simple_poll,
1916
(int)(retry_interval * 1000));
2403
ret = avahi_loop_with_timeout(simple_poll,
2404
(int)(retry_interval * 1000), &mc);
1917
2405
if(debug){
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
2406
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2407
(ret == 0) ? "successfully" : "with error");
1920
2408
}
1921
2409
1922
2410
end:
1923
2411
1924
2412
if(debug){
1925
fprintf(stderr, "%s exiting\n", argv[0]);
2413
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1926
2414
}
1927
2415
1928
2416
/* Cleanup things */
2417
free(mc.interfaces);
2418
1929
2419
if(sb != NULL)
1930
2420
avahi_s_service_browser_free(sb);
1931
2421
1932
2422
if(mc.server != NULL)
1933
2423
avahi_server_free(mc.server);
1934
2424
1935
if(mc.simple_poll != NULL)
1936
avahi_simple_poll_free(mc.simple_poll);
2425
if(simple_poll != NULL)
2426
avahi_simple_poll_free(simple_poll);
1937
2427
1938
2428
if(gnutls_initialized){
1939
2429
gnutls_certificate_free_credentials(mc.cred);
1944
2434
if(gpgme_initialized){
1945
2435
gpgme_release(mc.ctx);
1946
2436
}
1947
2437
1948
2438
/* Cleans up the circular linked list of Mandos servers the client
1949
2439
has seen */
1950
2440
if(mc.current_server != NULL){
1956
2446
}
1957
2447
}
1958
2448
1959
/* Take down the network interface */
1960
if(take_down_interface){
1961
/* Re-raise priviliges */
1962
errno = 0;
1963
ret = seteuid(0);
1964
if(ret == -1){
1965
perror_plus("seteuid");
1966
}
1967
if(geteuid() == 0){
1968
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1969
if(ret == -1){
1970
perror_plus("ioctl SIOCGIFFLAGS");
1971
} else if(network.ifr_flags & IFF_UP) {
1972
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2449
/* Re-raise priviliges */
2450
{
2451
raise_privileges();
2452
2453
/* Run network hooks */
2454
run_network_hooks("stop", interfaces_hooks != NULL ?
2455
interfaces_hooks : "", delay);
2456
2457
/* Take down the network interfaces which were brought up */
2458
{
2459
char *interface = NULL;
2460
while((interface=argz_next(interfaces_to_take_down,
2461
interfaces_to_take_down_size,
2462
interface))){
2463
ret_errno = take_down_interface(interface);
2464
if(ret_errno != 0){
2465
errno = ret_errno;
2466
perror_plus("Failed to take down interface");
1976
2467
}
1977
2468
}
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1982
/* Lower privileges permanently */
1983
errno = 0;
1984
ret = setuid(uid);
1985
if(ret == -1){
1986
perror_plus("setuid");
2469
if(debug and (interfaces_to_take_down == NULL)){
2470
fprintf_plus(stderr, "No interfaces needed to be taken"
2471
" down\n");
1987
2472
}
1988
2473
}
2474
2475
lower_privileges_permanently();
1989
2476
}
1990
2477
2478
free(interfaces_to_take_down);
2479
free(interfaces_hooks);
2480
1991
2481
/* Removes the GPGME temp directory and all files inside */
1992
2482
if(tempdir_created){
1993
2483
struct dirent **direntries = NULL;
1994
2484
struct dirent *direntry = NULL;
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1996
if (ret > 0){
1997
for(int i = 0; i < ret; i++){
2485
int numentries = scandir(tempdir, &direntries, notdotentries,
2486
alphasort);
2487
if (numentries > 0){
2488
for(int i = 0; i < numentries; i++){
1998
2489
direntry = direntries[i];
1999
2490
char *fullname = NULL;
2000
2491
ret = asprintf(&fullname, "%s/%s", tempdir,
2005
2496
}
2006
2497
ret = remove(fullname);
2007
2498
if(ret == -1){
2008
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2009
strerror(errno));
2499
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2500
strerror(errno));
2010
2501
}
2011
2502
free(fullname);
2012
2503
}
2013
2504
}
2014
2505
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2016
specify */
2506
/* need to clean even if 0 because man page doesn't specify */
2017
2507
free(direntries);
2018
if (ret == -1){
2508
if (numentries == -1){
2019
2509
perror_plus("scandir");
2020
2510
}
2021
2511
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0