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- Committer: Teddy Hogeborn
- Date: 2011-07-16 00:29:19 UTC
- Revision ID: teddy@fukt.bsnet.se-20110716002919-r77yikuiulj42o40
* initramfs-tools-script: Abort if plugin-runner is missing. Removed
workaround for Debian bug #633582; the
workaround required getopt, which can not be
guaranteed.
* plugin-runner.c (main): Work around Debian bug #633582.
* plugins.d/mandos-client.c (main): - '' -
workaround for Debian bug #633582; the
workaround required getopt, which can not be
guaranteed.
* plugin-runner.c (main): Work around Debian bug #633582.
* plugins.d/mandos-client.c (main): - '' -
- files removed:
- 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 © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.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, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_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(), S_ISREG */
56
#include <sys/stat.h> /* open() */
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() */
64
65
#include <errno.h> /* perror(), errno,
65
66
program_invocation_short_name */
66
67
#include <time.h> /* nanosleep(), time(), sleep() */
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
setgid(), pause() */
76
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
84
85
raise() */
85
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
87
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() */
94
88
95
89
#ifdef __linux__
96
90
#include <sys/klog.h> /* klogctl() */
114
108
init_gnutls_session(),
115
109
GNUTLS_* */
116
110
#include <gnutls/openpgp.h>
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
119
113
120
114
/* GPGME */
121
115
#include <gpgme.h> /* All GPGME types, constants and
129
123
#define PATHDIR "/conf/conf.d/mandos"
130
124
#define SECKEY "seckey.txt"
131
125
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
133
126
134
127
bool debug = false;
135
128
static const char mandos_protocol_version[] = "1";
136
129
const char *argp_program_version = "mandos-client " VERSION;
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
138
131
static const char sys_class_net[] = "/sys/class/net";
139
132
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
133
144
134
/* Doubly linked list that need to be circularly linked when used */
145
135
typedef struct server{
146
136
const char *ip;
147
in_port_t port;
137
uint16_t port;
148
138
AvahiIfIndex if_index;
149
139
int af;
150
140
struct timespec last_seen;
154
144
155
145
/* Used for passing in values through the Avahi callback functions */
156
146
typedef struct {
147
AvahiSimplePoll *simple_poll;
157
148
AvahiServer *server;
158
149
gnutls_certificate_credentials_t cred;
159
150
unsigned int dh_bits;
161
152
const char *priority;
162
153
gpgme_ctx_t ctx;
163
154
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
166
155
} mandos_context;
167
156
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
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 };
170
162
171
163
sig_atomic_t quit_now = 0;
172
164
int signal_received = 0;
173
165
174
166
/* Function to use when printing errors */
175
167
void perror_plus(const char *print_text){
176
int e = errno;
177
168
fprintf(stderr, "Mandos plugin %s: ",
178
169
program_invocation_short_name);
179
errno = e;
180
170
perror(print_text);
181
171
}
182
172
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
193
173
/*
194
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
195
175
* bytes. "buffer_capacity" is how much is currently allocated,
196
176
* "buffer_length" is how much is already used.
197
177
*/
198
178
size_t incbuffer(char **buffer, size_t buffer_length,
199
size_t buffer_capacity){
179
size_t buffer_capacity){
200
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
201
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
if(new_buf == NULL){
203
int old_errno = errno;
204
free(*buffer);
205
errno = old_errno;
206
*buffer = NULL;
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
if(buffer == NULL){
207
183
return 0;
208
184
}
209
*buffer = new_buf;
210
185
buffer_capacity += BUFFER_SIZE;
211
186
}
212
187
return buffer_capacity;
213
188
}
214
189
215
/* Add server to set of servers to retry periodically */
216
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
217
int af, server **current_server){
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
218
193
int ret;
219
194
server *new_server = malloc(sizeof(server));
220
195
if(new_server == NULL){
221
196
perror_plus("malloc");
222
return false;
197
return -1;
223
198
}
224
199
*new_server = (server){ .ip = strdup(ip),
225
.port = port,
226
.if_index = if_index,
227
.af = af };
200
.port = port,
201
.if_index = if_index,
202
.af = af };
228
203
if(new_server->ip == NULL){
229
204
perror_plus("strdup");
230
return false;
205
return -1;
231
206
}
232
/* Special case of first server */
233
if(*current_server == NULL){
207
/* unique case of first server */
208
if (mc.current_server == NULL){
234
209
new_server->next = new_server;
235
210
new_server->prev = new_server;
236
*current_server = new_server;
237
/* Place the new server last in the list */
211
mc.current_server = new_server;
212
/* Placing the new server last in the list */
238
213
} else {
239
new_server->next = *current_server;
240
new_server->prev = (*current_server)->prev;
214
new_server->next = mc.current_server;
215
new_server->prev = mc.current_server->prev;
241
216
new_server->prev->next = new_server;
242
(*current_server)->prev = new_server;
217
mc.current_server->prev = new_server;
243
218
}
244
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
219
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
245
220
if(ret == -1){
246
221
perror_plus("clock_gettime");
247
return false;
222
return -1;
248
223
}
249
return true;
224
return 0;
250
225
}
251
226
252
227
/*
253
228
* Initialize GPGME.
254
229
*/
255
static bool init_gpgme(const char *seckey, const char *pubkey,
256
const char *tempdir, mandos_context *mc){
230
static bool init_gpgme(const char *seckey,
231
const char *pubkey, const char *tempdir){
257
232
gpgme_error_t rc;
258
233
gpgme_engine_info_t engine_info;
259
234
235
260
236
/*
261
237
* Helper function to insert pub and seckey to the engine keyring.
262
238
*/
273
249
274
250
rc = gpgme_data_new_from_fd(&pgp_data, fd);
275
251
if(rc != GPG_ERR_NO_ERROR){
276
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
252
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
253
gpgme_strsource(rc), gpgme_strerror(rc));
278
254
return false;
279
255
}
280
256
281
rc = gpgme_op_import(mc->ctx, pgp_data);
257
rc = gpgme_op_import(mc.ctx, pgp_data);
282
258
if(rc != GPG_ERR_NO_ERROR){
283
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
259
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
260
gpgme_strsource(rc), gpgme_strerror(rc));
285
261
return false;
286
262
}
287
263
294
270
}
295
271
296
272
if(debug){
297
fprintf_plus(stderr, "Initializing GPGME\n");
273
fprintf(stderr, "Initializing GPGME\n");
298
274
}
299
275
300
276
/* Init GPGME */
301
277
gpgme_check_version(NULL);
302
278
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
303
279
if(rc != GPG_ERR_NO_ERROR){
304
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
305
gpgme_strsource(rc), gpgme_strerror(rc));
280
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
306
282
return false;
307
283
}
308
284
309
/* Set GPGME home directory for the OpenPGP engine only */
285
/* Set GPGME home directory for the OpenPGP engine only */
310
286
rc = gpgme_get_engine_info(&engine_info);
311
287
if(rc != GPG_ERR_NO_ERROR){
312
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
313
gpgme_strsource(rc), gpgme_strerror(rc));
288
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
314
290
return false;
315
291
}
316
292
while(engine_info != NULL){
322
298
engine_info = engine_info->next;
323
299
}
324
300
if(engine_info == NULL){
325
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
326
tempdir);
301
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
327
302
return false;
328
303
}
329
304
330
305
/* Create new GPGME "context" */
331
rc = gpgme_new(&(mc->ctx));
306
rc = gpgme_new(&(mc.ctx));
332
307
if(rc != GPG_ERR_NO_ERROR){
333
fprintf_plus(stderr, "Mandos plugin mandos-client: "
334
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
335
gpgme_strerror(rc));
308
fprintf(stderr, "bad gpgme_new: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
336
310
return false;
337
311
}
338
312
349
323
*/
350
324
static ssize_t pgp_packet_decrypt(const char *cryptotext,
351
325
size_t crypto_size,
352
char **plaintext,
353
mandos_context *mc){
326
char **plaintext){
354
327
gpgme_data_t dh_crypto, dh_plain;
355
328
gpgme_error_t rc;
356
329
ssize_t ret;
358
331
ssize_t plaintext_length = 0;
359
332
360
333
if(debug){
361
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
334
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
362
335
}
363
336
364
337
/* Create new GPGME data buffer from memory cryptotext */
365
338
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
366
339
0);
367
340
if(rc != GPG_ERR_NO_ERROR){
368
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
369
gpgme_strsource(rc), gpgme_strerror(rc));
341
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
342
gpgme_strsource(rc), gpgme_strerror(rc));
370
343
return -1;
371
344
}
372
345
373
346
/* Create new empty GPGME data buffer for the plaintext */
374
347
rc = gpgme_data_new(&dh_plain);
375
348
if(rc != GPG_ERR_NO_ERROR){
376
fprintf_plus(stderr, "Mandos plugin mandos-client: "
377
"bad gpgme_data_new: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
349
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
350
gpgme_strsource(rc), gpgme_strerror(rc));
379
351
gpgme_data_release(dh_crypto);
380
352
return -1;
381
353
}
382
354
383
355
/* Decrypt data from the cryptotext data buffer to the plaintext
384
356
data buffer */
385
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
357
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
386
358
if(rc != GPG_ERR_NO_ERROR){
387
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
389
361
plaintext_length = -1;
390
362
if(debug){
391
363
gpgme_decrypt_result_t result;
392
result = gpgme_op_decrypt_result(mc->ctx);
364
result = gpgme_op_decrypt_result(mc.ctx);
393
365
if(result == NULL){
394
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
395
367
} else {
396
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
397
result->unsupported_algorithm);
398
fprintf_plus(stderr, "Wrong key usage: %u\n",
399
result->wrong_key_usage);
368
fprintf(stderr, "Unsupported algorithm: %s\n",
369
result->unsupported_algorithm);
370
fprintf(stderr, "Wrong key usage: %u\n",
371
result->wrong_key_usage);
400
372
if(result->file_name != NULL){
401
fprintf_plus(stderr, "File name: %s\n", result->file_name);
373
fprintf(stderr, "File name: %s\n", result->file_name);
402
374
}
403
375
gpgme_recipient_t recipient;
404
376
recipient = result->recipients;
405
377
while(recipient != NULL){
406
fprintf_plus(stderr, "Public key algorithm: %s\n",
407
gpgme_pubkey_algo_name
408
(recipient->pubkey_algo));
409
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
410
fprintf_plus(stderr, "Secret key available: %s\n",
411
recipient->status == GPG_ERR_NO_SECKEY
412
? "No" : "Yes");
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");
413
384
recipient = recipient->next;
414
385
}
415
386
}
418
389
}
419
390
420
391
if(debug){
421
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
392
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
422
393
}
423
394
424
395
/* Seek back to the beginning of the GPGME plaintext data buffer */
431
402
*plaintext = NULL;
432
403
while(true){
433
404
plaintext_capacity = incbuffer(plaintext,
434
(size_t)plaintext_length,
435
plaintext_capacity);
405
(size_t)plaintext_length,
406
plaintext_capacity);
436
407
if(plaintext_capacity == 0){
437
perror_plus("incbuffer");
438
plaintext_length = -1;
439
goto decrypt_end;
408
perror_plus("incbuffer");
409
plaintext_length = -1;
410
goto decrypt_end;
440
411
}
441
412
442
413
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
455
426
}
456
427
457
428
if(debug){
458
fprintf_plus(stderr, "Decrypted password is: ");
429
fprintf(stderr, "Decrypted password is: ");
459
430
for(ssize_t i = 0; i < plaintext_length; i++){
460
431
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
461
432
}
473
444
}
474
445
475
446
static const char * safer_gnutls_strerror(int value){
476
const char *ret = gnutls_strerror(value);
447
const char *ret = gnutls_strerror(value); /* Spurious warning from
448
-Wunreachable-code */
477
449
if(ret == NULL)
478
450
ret = "(unknown)";
479
451
return ret;
482
454
/* GnuTLS log function callback */
483
455
static void debuggnutls(__attribute__((unused)) int level,
484
456
const char* string){
485
fprintf_plus(stderr, "GnuTLS: %s", string);
457
fprintf(stderr, "GnuTLS: %s", string);
486
458
}
487
459
488
460
static int init_gnutls_global(const char *pubkeyfilename,
489
const char *seckeyfilename,
490
mandos_context *mc){
461
const char *seckeyfilename){
491
462
int ret;
492
463
493
464
if(debug){
494
fprintf_plus(stderr, "Initializing GnuTLS\n");
465
fprintf(stderr, "Initializing GnuTLS\n");
495
466
}
496
467
497
468
ret = gnutls_global_init();
498
469
if(ret != GNUTLS_E_SUCCESS){
499
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
500
safer_gnutls_strerror(ret));
470
fprintf(stderr, "GnuTLS global_init: %s\n",
471
safer_gnutls_strerror(ret));
501
472
return -1;
502
473
}
503
474
510
481
}
511
482
512
483
/* OpenPGP credentials */
513
ret = gnutls_certificate_allocate_credentials(&mc->cred);
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
514
485
if(ret != GNUTLS_E_SUCCESS){
515
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
516
safer_gnutls_strerror(ret));
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
517
488
gnutls_global_deinit();
518
489
return -1;
519
490
}
520
491
521
492
if(debug){
522
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
523
" secret key %s as GnuTLS credentials\n",
524
pubkeyfilename,
525
seckeyfilename);
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
526
496
}
527
497
528
498
ret = gnutls_certificate_set_openpgp_key_file
529
(mc->cred, pubkeyfilename, seckeyfilename,
499
(mc.cred, pubkeyfilename, seckeyfilename,
530
500
GNUTLS_OPENPGP_FMT_BASE64);
531
501
if(ret != GNUTLS_E_SUCCESS){
532
fprintf_plus(stderr,
533
"Error[%d] while reading the OpenPGP key pair ('%s',"
534
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
535
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
536
safer_gnutls_strerror(ret));
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));
537
507
goto globalfail;
538
508
}
539
509
540
510
/* GnuTLS server initialization */
541
ret = gnutls_dh_params_init(&mc->dh_params);
511
ret = gnutls_dh_params_init(&mc.dh_params);
542
512
if(ret != GNUTLS_E_SUCCESS){
543
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
544
" initialization: %s\n",
545
safer_gnutls_strerror(ret));
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
546
515
goto globalfail;
547
516
}
548
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
549
518
if(ret != GNUTLS_E_SUCCESS){
550
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
551
safer_gnutls_strerror(ret));
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
552
521
goto globalfail;
553
522
}
554
523
555
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
556
525
557
526
return 0;
558
527
559
528
globalfail:
560
529
561
gnutls_certificate_free_credentials(mc->cred);
530
gnutls_certificate_free_credentials(mc.cred);
562
531
gnutls_global_deinit();
563
gnutls_dh_params_deinit(mc->dh_params);
532
gnutls_dh_params_deinit(mc.dh_params);
564
533
return -1;
565
534
}
566
535
567
static int init_gnutls_session(gnutls_session_t *session,
568
mandos_context *mc){
536
static int init_gnutls_session(gnutls_session_t *session){
569
537
int ret;
570
538
/* GnuTLS session creation */
571
539
do {
575
543
}
576
544
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
577
545
if(ret != GNUTLS_E_SUCCESS){
578
fprintf_plus(stderr,
579
"Error in GnuTLS session initialization: %s\n",
580
safer_gnutls_strerror(ret));
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
581
548
}
582
549
583
550
{
584
551
const char *err;
585
552
do {
586
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
587
554
if(quit_now){
588
555
gnutls_deinit(*session);
589
556
return -1;
590
557
}
591
558
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
592
559
if(ret != GNUTLS_E_SUCCESS){
593
fprintf_plus(stderr, "Syntax error at: %s\n", err);
594
fprintf_plus(stderr, "GnuTLS error: %s\n",
595
safer_gnutls_strerror(ret));
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
safer_gnutls_strerror(ret));
596
563
gnutls_deinit(*session);
597
564
return -1;
598
565
}
600
567
601
568
do {
602
569
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
603
mc->cred);
570
mc.cred);
604
571
if(quit_now){
605
572
gnutls_deinit(*session);
606
573
return -1;
607
574
}
608
575
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
609
576
if(ret != GNUTLS_E_SUCCESS){
610
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
611
safer_gnutls_strerror(ret));
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
612
579
gnutls_deinit(*session);
613
580
return -1;
614
581
}
616
583
/* ignore client certificate if any. */
617
584
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
618
585
619
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
620
587
621
588
return 0;
622
589
}
626
593
__attribute__((unused)) const char *txt){}
627
594
628
595
/* Called when a Mandos server is found */
629
static int start_mandos_communication(const char *ip, in_port_t port,
596
static int start_mandos_communication(const char *ip, uint16_t port,
630
597
AvahiIfIndex if_index,
631
int af, mandos_context *mc){
598
int af){
632
599
int ret, tcp_sd = -1;
633
600
ssize_t sret;
634
601
union {
659
626
pf = PF_INET;
660
627
break;
661
628
default:
662
fprintf_plus(stderr, "Bad address family: %d\n", af);
629
fprintf(stderr, "Bad address family: %d\n", af);
663
630
errno = EINVAL;
664
631
return -1;
665
632
}
666
633
667
/* If the interface is specified and we have a list of interfaces */
668
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
669
/* Check if the interface is one of the interfaces we are using */
670
bool match = false;
671
{
672
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
674
interface))){
675
if(if_nametoindex(interface) == (unsigned int)if_index){
676
match = true;
677
break;
678
}
679
}
680
}
681
if(not match){
682
/* This interface does not match any in the list, so we don't
683
connect to the server */
684
if(debug){
685
char interface[IF_NAMESIZE];
686
if(if_indextoname((unsigned int)if_index, interface) == NULL){
687
perror_plus("if_indextoname");
688
} else {
689
fprintf_plus(stderr, "Skipping server on non-used interface"
690
" \"%s\"\n",
691
if_indextoname((unsigned int)if_index,
692
interface));
693
}
694
}
695
return -1;
696
}
697
}
698
699
ret = init_gnutls_session(&session, mc);
634
ret = init_gnutls_session(&session);
700
635
if(ret != 0){
701
636
return -1;
702
637
}
703
638
704
639
if(debug){
705
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
706
PRIuMAX "\n", ip, (uintmax_t)port);
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
707
642
}
708
643
709
644
tcp_sd = socket(pf, SOCK_STREAM, 0);
735
670
}
736
671
if(ret == 0){
737
672
int e = errno;
738
fprintf_plus(stderr, "Bad address: %s\n", ip);
673
fprintf(stderr, "Bad address: %s\n", ip);
739
674
errno = e;
740
675
goto mandos_end;
741
676
}
742
677
if(af == AF_INET6){
743
to.in6.sin6_port = htons(port);
744
#ifdef __GNUC__
745
#pragma GCC diagnostic push
746
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
747
#endif
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
-Wconversion and
680
-Wunreachable-code */
681
748
682
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
749
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
750
#ifdef __GNUC__
751
#pragma GCC diagnostic pop
752
#endif
683
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
753
685
if(if_index == AVAHI_IF_UNSPEC){
754
fprintf_plus(stderr, "An IPv6 link-local address is"
755
" incomplete without a network interface\n");
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
756
688
errno = EINVAL;
757
689
goto mandos_end;
758
690
}
760
692
to.in6.sin6_scope_id = (uint32_t)if_index;
761
693
}
762
694
} else {
763
to.in.sin_port = htons(port);
695
to.in.sin_port = htons(port); /* Spurious warnings from
696
-Wconversion and
697
-Wunreachable-code */
764
698
}
765
699
766
700
if(quit_now){
774
708
if(if_indextoname((unsigned int)if_index, interface) == NULL){
775
709
perror_plus("if_indextoname");
776
710
} else {
777
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
778
"\n", ip, interface, (uintmax_t)port);
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
779
713
}
780
714
} else {
781
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
782
ip, (uintmax_t)port);
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
783
717
}
784
718
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
785
719
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
795
729
perror_plus("inet_ntop");
796
730
} else {
797
731
if(strcmp(addrstr, ip) != 0){
798
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
799
733
}
800
734
}
801
735
}
829
763
while(true){
830
764
size_t out_size = strlen(out);
831
765
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
832
out_size - written));
766
out_size - written));
833
767
if(ret == -1){
834
768
int e = errno;
835
769
perror_plus("write");
855
789
}
856
790
857
791
if(debug){
858
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
859
793
}
860
794
861
795
if(quit_now){
863
797
goto mandos_end;
864
798
}
865
799
866
/* This casting via intptr_t is to eliminate warning about casting
867
an int to a pointer type. This is exactly how the GnuTLS Guile
868
function "set-session-transport-fd!" does it. */
869
gnutls_transport_set_ptr(session,
870
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
800
/* Spurious warning from -Wint-to-pointer-cast */
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
871
802
872
803
if(quit_now){
873
804
errno = EINTR;
884
815
885
816
if(ret != GNUTLS_E_SUCCESS){
886
817
if(debug){
887
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
888
819
gnutls_perror(ret);
889
820
}
890
821
errno = EPROTO;
894
825
/* Read OpenPGP packet that contains the wanted password */
895
826
896
827
if(debug){
897
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
898
" %s\n", ip);
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
899
830
}
900
831
901
832
while(true){
906
837
}
907
838
908
839
buffer_capacity = incbuffer(&buffer, buffer_length,
909
buffer_capacity);
840
buffer_capacity);
910
841
if(buffer_capacity == 0){
911
842
int e = errno;
912
843
perror_plus("incbuffer");
939
870
}
940
871
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
941
872
if(ret < 0){
942
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
943
"***\n");
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
944
874
gnutls_perror(ret);
945
875
errno = EPROTO;
946
876
goto mandos_end;
947
877
}
948
878
break;
949
879
default:
950
fprintf_plus(stderr, "Unknown error while reading data from"
951
" encrypted session with Mandos server\n");
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
952
882
gnutls_bye(session, GNUTLS_SHUT_RDWR);
953
883
errno = EIO;
954
884
goto mandos_end;
959
889
}
960
890
961
891
if(debug){
962
fprintf_plus(stderr, "Closing TLS session\n");
892
fprintf(stderr, "Closing TLS session\n");
963
893
}
964
894
965
895
if(quit_now){
977
907
978
908
if(buffer_length > 0){
979
909
ssize_t decrypted_buffer_size;
980
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
981
&decrypted_buffer, mc);
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
912
&decrypted_buffer);
982
913
if(decrypted_buffer_size >= 0){
983
914
984
915
written = 0;
994
925
if(ret == 0 and ferror(stdout)){
995
926
int e = errno;
996
927
if(debug){
997
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
998
strerror(errno));
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
999
930
}
1000
931
errno = e;
1001
932
goto mandos_end;
1045
976
AVAHI_GCC_UNUSED AvahiStringList *txt,
1046
977
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1047
978
flags,
1048
void* mc){
1049
if(r == NULL){
1050
return;
1051
}
979
AVAHI_GCC_UNUSED void* userdata){
980
assert(r);
1052
981
1053
982
/* Called whenever a service has been resolved successfully or
1054
983
timed out */
1060
989
switch(event){
1061
990
default:
1062
991
case AVAHI_RESOLVER_FAILURE:
1063
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1064
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1065
domain,
1066
avahi_strerror(avahi_server_errno
1067
(((mandos_context*)mc)->server)));
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)));
1068
995
break;
1069
996
1070
997
case AVAHI_RESOLVER_FOUND:
1072
999
char ip[AVAHI_ADDRESS_STR_MAX];
1073
1000
avahi_address_snprint(ip, sizeof(ip), address);
1074
1001
if(debug){
1075
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1076
PRIdMAX ") on port %" PRIu16 "\n", name,
1077
host_name, ip, (intmax_t)interface, port);
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);
1078
1005
}
1079
int ret = start_mandos_communication(ip, (in_port_t)port,
1080
interface,
1081
avahi_proto_to_af(proto),
1082
mc);
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
1083
1008
if(ret == 0){
1084
avahi_simple_poll_quit(simple_poll);
1009
avahi_simple_poll_quit(mc.simple_poll);
1085
1010
} else {
1086
if(not add_server(ip, (in_port_t)port, interface,
1087
avahi_proto_to_af(proto),
1088
&((mandos_context*)mc)->current_server)){
1089
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1090
" list\n", name);
1091
}
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1092
1013
}
1093
1014
}
1094
1015
}
1104
1025
const char *domain,
1105
1026
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1106
1027
flags,
1107
void* mc){
1108
if(b == NULL){
1109
return;
1110
}
1028
AVAHI_GCC_UNUSED void* userdata){
1029
assert(b);
1111
1030
1112
1031
/* Called whenever a new services becomes available on the LAN or
1113
1032
is removed from the LAN */
1120
1039
default:
1121
1040
case AVAHI_BROWSER_FAILURE:
1122
1041
1123
fprintf_plus(stderr, "(Avahi browser) %s\n",
1124
avahi_strerror(avahi_server_errno
1125
(((mandos_context*)mc)->server)));
1126
avahi_simple_poll_quit(simple_poll);
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
1127
1045
return;
1128
1046
1129
1047
case AVAHI_BROWSER_NEW:
1132
1050
the callback function is called the Avahi server will free the
1133
1051
resolver for us. */
1134
1052
1135
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1136
interface, protocol, name, type,
1137
domain, protocol, 0,
1138
resolve_callback, mc) == NULL)
1139
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1140
" %s\n", name,
1141
avahi_strerror(avahi_server_errno
1142
(((mandos_context*)mc)->server)));
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)));
1143
1058
break;
1144
1059
1145
1060
case AVAHI_BROWSER_REMOVE:
1148
1063
case AVAHI_BROWSER_ALL_FOR_NOW:
1149
1064
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1150
1065
if(debug){
1151
fprintf_plus(stderr, "No Mandos server found, still"
1152
" searching...\n");
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1153
1067
}
1154
1068
break;
1155
1069
}
1164
1078
signal_received = sig;
1165
1079
int old_errno = errno;
1166
1080
/* set main loop to exit */
1167
if(simple_poll != NULL){
1168
avahi_simple_poll_quit(simple_poll);
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1169
1083
}
1170
1084
errno = old_errno;
1171
1085
}
1172
1086
1173
bool get_flags(const char *ifname, struct ifreq *ifr){
1174
int ret;
1175
error_t ret_errno;
1176
1177
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1178
if(s < 0){
1179
ret_errno = errno;
1180
perror_plus("socket");
1181
errno = ret_errno;
1182
return false;
1183
}
1184
strcpy(ifr->ifr_name, ifname);
1185
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1186
if(ret == -1){
1087
/*
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1091
*/
1092
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1096
return 0;
1097
}
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){
1187
1143
if(debug){
1188
ret_errno = errno;
1189
perror_plus("ioctl SIOCGIFFLAGS");
1190
errno = ret_errno;
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1191
1146
}
1192
return false;
1147
free(flagstring);
1148
return 0;
1193
1149
}
1194
return true;
1195
}
1196
1197
bool good_flags(const char *ifname, const struct ifreq *ifr){
1198
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1199
1152
/* Reject the loopback device */
1200
if(ifr->ifr_flags & IFF_LOOPBACK){
1153
if(flags & IFF_LOOPBACK){
1201
1154
if(debug){
1202
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1203
ifname);
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1204
1157
}
1205
return false;
1158
return 0;
1206
1159
}
1207
1160
/* Accept point-to-point devices only if connect_to is specified */
1208
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1209
1162
if(debug){
1210
fprintf_plus(stderr, "Accepting point-to-point interface"
1211
" \"%s\"\n", ifname);
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1212
1165
}
1213
return true;
1166
return 1;
1214
1167
}
1215
1168
/* Otherwise, reject non-broadcast-capable devices */
1216
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1169
if(not (flags & IFF_BROADCAST)){
1217
1170
if(debug){
1218
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1219
" \"%s\"\n", ifname);
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1220
1173
}
1221
return false;
1174
return 0;
1222
1175
}
1223
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1224
if(ifr->ifr_flags & IFF_NOARP){
1177
if(flags & IFF_NOARP){
1225
1178
if(debug){
1226
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1227
ifname);
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1228
1181
}
1229
return false;
1182
return 0;
1230
1183
}
1231
1232
1184
/* Accept this device */
1233
1185
if(debug){
1234
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1235
}
1236
return true;
1237
}
1238
1239
/*
1240
* This function determines if a directory entry in /sys/class/net
1241
* corresponds to an acceptable network device.
1242
* (This function is passed to scandir(3) as a filter function.)
1243
*/
1244
int good_interface(const struct dirent *if_entry){
1245
if(if_entry->d_name[0] == '.'){
1246
return 0;
1247
}
1248
1249
struct ifreq ifr;
1250
if(not get_flags(if_entry->d_name, &ifr)){
1251
if(debug){
1252
fprintf_plus(stderr, "Failed to get flags for interface "
1253
"\"%s\"\n", if_entry->d_name);
1254
}
1255
return 0;
1256
}
1257
1258
if(not good_flags(if_entry->d_name, &ifr)){
1259
return 0;
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1260
1188
}
1261
1189
return 1;
1262
1190
}
1263
1191
1264
/*
1265
* This function determines if a network interface is up.
1266
*/
1267
bool interface_is_up(const char *interface){
1268
struct ifreq ifr;
1269
if(not get_flags(interface, &ifr)){
1270
if(debug){
1271
fprintf_plus(stderr, "Failed to get flags for interface "
1272
"\"%s\"\n", interface);
1273
}
1274
return false;
1275
}
1276
1277
return (bool)(ifr.ifr_flags & IFF_UP);
1278
}
1279
1280
/*
1281
* This function determines if a network interface is running
1282
*/
1283
bool interface_is_running(const char *interface){
1284
struct ifreq ifr;
1285
if(not get_flags(interface, &ifr)){
1286
if(debug){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1289
}
1290
return false;
1291
}
1292
1293
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1294
}
1295
1296
1192
int notdotentries(const struct dirent *direntry){
1297
1193
/* Skip "." and ".." */
1298
1194
if(direntry->d_name[0] == '.'
1304
1200
return 1;
1305
1201
}
1306
1202
1307
/* Is this directory entry a runnable program? */
1308
int runnable_hook(const struct dirent *direntry){
1309
int ret;
1310
size_t sret;
1311
struct stat st;
1312
1313
if((direntry->d_name)[0] == '\0'){
1314
/* Empty name? */
1315
return 0;
1316
}
1317
1318
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1319
"abcdefghijklmnopqrstuvwxyz"
1320
"0123456789"
1321
"_-");
1322
if((direntry->d_name)[sret] != '\0'){
1323
/* Contains non-allowed characters */
1324
if(debug){
1325
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1326
direntry->d_name);
1327
}
1328
return 0;
1329
}
1330
1331
char *fullname = NULL;
1332
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1333
if(ret < 0){
1334
perror_plus("asprintf");
1335
return 0;
1336
}
1337
1338
ret = stat(fullname, &st);
1339
if(ret == -1){
1340
if(debug){
1341
perror_plus("Could not stat hook");
1342
}
1343
return 0;
1344
}
1345
if(not (S_ISREG(st.st_mode))){
1346
/* Not a regular file */
1347
if(debug){
1348
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1349
direntry->d_name);
1350
}
1351
return 0;
1352
}
1353
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1354
/* Not executable */
1355
if(debug){
1356
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1357
direntry->d_name);
1358
}
1359
return 0;
1360
}
1361
if(debug){
1362
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1363
direntry->d_name);
1364
}
1365
return 1;
1366
}
1367
1368
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1369
mandos_context *mc){
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1370
1204
int ret;
1371
1205
struct timespec now;
1372
1206
struct timespec waited_time;
1373
1207
intmax_t block_time;
1374
1208
1375
1209
while(true){
1376
if(mc->current_server == NULL){
1210
if(mc.current_server == NULL){
1377
1211
if (debug){
1378
fprintf_plus(stderr, "Wait until first server is found."
1379
" No timeout!\n");
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1380
1214
}
1381
1215
ret = avahi_simple_poll_iterate(s, -1);
1382
1216
} else {
1383
1217
if (debug){
1384
fprintf_plus(stderr, "Check current_server if we should run"
1385
" it, or wait\n");
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1386
1220
}
1387
1221
/* the current time */
1388
1222
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1393
1227
/* Calculating in ms how long time between now and server
1394
1228
who we visted longest time ago. Now - last seen. */
1395
1229
waited_time.tv_sec = (now.tv_sec
1396
- mc->current_server->last_seen.tv_sec);
1230
- mc.current_server->last_seen.tv_sec);
1397
1231
waited_time.tv_nsec = (now.tv_nsec
1398
- mc->current_server->last_seen.tv_nsec);
1232
- mc.current_server->last_seen.tv_nsec);
1399
1233
/* total time is 10s/10,000ms.
1400
1234
Converting to s from ms by dividing by 1,000,
1401
1235
and ns to ms by dividing by 1,000,000. */
1402
1236
block_time = ((retry_interval
1403
1237
- ((intmax_t)waited_time.tv_sec * 1000))
1404
1238
- ((intmax_t)waited_time.tv_nsec / 1000000));
1405
1239
1406
1240
if (debug){
1407
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1408
block_time);
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1409
1242
}
1410
1243
1411
1244
if(block_time <= 0){
1412
ret = start_mandos_communication(mc->current_server->ip,
1413
mc->current_server->port,
1414
mc->current_server->if_index,
1415
mc->current_server->af, mc);
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);
1416
1249
if(ret == 0){
1417
avahi_simple_poll_quit(s);
1250
avahi_simple_poll_quit(mc.simple_poll);
1418
1251
return 0;
1419
1252
}
1420
1253
ret = clock_gettime(CLOCK_MONOTONIC,
1421
&mc->current_server->last_seen);
1254
&mc.current_server->last_seen);
1422
1255
if(ret == -1){
1423
1256
perror_plus("clock_gettime");
1424
1257
return -1;
1425
1258
}
1426
mc->current_server = mc->current_server->next;
1259
mc.current_server = mc.current_server->next;
1427
1260
block_time = 0; /* Call avahi to find new Mandos
1428
1261
servers, but don't block */
1429
1262
}
1431
1264
ret = avahi_simple_poll_iterate(s, (int)block_time);
1432
1265
}
1433
1266
if(ret != 0){
1434
if (ret > 0 or errno != EINTR){
1267
if (ret > 0 or errno != EINTR) {
1435
1268
return (ret != 1) ? ret : 0;
1436
1269
}
1437
1270
}
1438
1271
}
1439
1272
}
1440
1273
1441
/* Set effective uid to 0, return errno */
1442
error_t raise_privileges(void){
1443
error_t old_errno = errno;
1444
error_t ret_errno = 0;
1445
if(seteuid(0) == -1){
1446
ret_errno = errno;
1447
perror_plus("seteuid");
1448
}
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
1453
/* Set effective and real user ID to 0. Return errno. */
1454
error_t raise_privileges_permanently(void){
1455
error_t old_errno = errno;
1456
error_t ret_errno = raise_privileges();
1457
if(ret_errno != 0){
1458
errno = old_errno;
1459
return ret_errno;
1460
}
1461
if(setuid(0) == -1){
1462
ret_errno = errno;
1463
perror_plus("seteuid");
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Set effective user ID to unprivileged saved user ID */
1470
error_t lower_privileges(void){
1471
error_t old_errno = errno;
1472
error_t ret_errno = 0;
1473
if(seteuid(uid) == -1){
1474
ret_errno = errno;
1475
perror_plus("seteuid");
1476
}
1477
errno = old_errno;
1478
return ret_errno;
1479
}
1480
1481
/* Lower privileges permanently */
1482
error_t lower_privileges_permanently(void){
1483
error_t old_errno = errno;
1484
error_t ret_errno = 0;
1485
if(setuid(uid) == -1){
1486
ret_errno = errno;
1487
perror_plus("setuid");
1488
}
1489
errno = old_errno;
1490
return ret_errno;
1491
}
1492
1493
bool run_network_hooks(const char *mode, const char *interface,
1494
const float delay){
1495
struct dirent **direntries;
1496
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1497
alphasort);
1498
if(numhooks == -1){
1499
if(errno == ENOENT){
1500
if(debug){
1501
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1502
" found\n", hookdir);
1503
}
1504
} else {
1505
perror_plus("scandir");
1506
}
1507
} else {
1508
struct dirent *direntry;
1509
int ret;
1510
int devnull = open("/dev/null", O_RDONLY);
1511
for(int i = 0; i < numhooks; i++){
1512
direntry = direntries[i];
1513
char *fullname = NULL;
1514
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1515
if(ret < 0){
1516
perror_plus("asprintf");
1517
continue;
1518
}
1519
if(debug){
1520
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1521
direntry->d_name);
1522
}
1523
pid_t hook_pid = fork();
1524
if(hook_pid == 0){
1525
/* Child */
1526
/* Raise privileges */
1527
raise_privileges_permanently();
1528
/* Set group */
1529
errno = 0;
1530
ret = setgid(0);
1531
if(ret == -1){
1532
perror_plus("setgid");
1533
}
1534
/* Reset supplementary groups */
1535
errno = 0;
1536
ret = setgroups(0, NULL);
1537
if(ret == -1){
1538
perror_plus("setgroups");
1539
}
1540
dup2(devnull, STDIN_FILENO);
1541
close(devnull);
1542
dup2(STDERR_FILENO, STDOUT_FILENO);
1543
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1544
if(ret == -1){
1545
perror_plus("setenv");
1546
_exit(EX_OSERR);
1547
}
1548
ret = setenv("DEVICE", interface, 1);
1549
if(ret == -1){
1550
perror_plus("setenv");
1551
_exit(EX_OSERR);
1552
}
1553
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1554
if(ret == -1){
1555
perror_plus("setenv");
1556
_exit(EX_OSERR);
1557
}
1558
ret = setenv("MODE", mode, 1);
1559
if(ret == -1){
1560
perror_plus("setenv");
1561
_exit(EX_OSERR);
1562
}
1563
char *delaystring;
1564
ret = asprintf(&delaystring, "%f", delay);
1565
if(ret == -1){
1566
perror_plus("asprintf");
1567
_exit(EX_OSERR);
1568
}
1569
ret = setenv("DELAY", delaystring, 1);
1570
if(ret == -1){
1571
free(delaystring);
1572
perror_plus("setenv");
1573
_exit(EX_OSERR);
1574
}
1575
free(delaystring);
1576
if(connect_to != NULL){
1577
ret = setenv("CONNECT", connect_to, 1);
1578
if(ret == -1){
1579
perror_plus("setenv");
1580
_exit(EX_OSERR);
1581
}
1582
}
1583
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1584
perror_plus("execl");
1585
_exit(EXIT_FAILURE);
1586
}
1587
} else {
1588
int status;
1589
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1590
perror_plus("waitpid");
1591
free(fullname);
1592
continue;
1593
}
1594
if(WIFEXITED(status)){
1595
if(WEXITSTATUS(status) != 0){
1596
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1597
" with status %d\n", direntry->d_name,
1598
WEXITSTATUS(status));
1599
free(fullname);
1600
continue;
1601
}
1602
} else if(WIFSIGNALED(status)){
1603
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1604
" signal %d\n", direntry->d_name,
1605
WTERMSIG(status));
1606
free(fullname);
1607
continue;
1608
} else {
1609
fprintf_plus(stderr, "Warning: network hook \"%s\""
1610
" crashed\n", direntry->d_name);
1611
free(fullname);
1612
continue;
1613
}
1614
}
1615
free(fullname);
1616
if(debug){
1617
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1618
direntry->d_name);
1619
}
1620
}
1621
close(devnull);
1622
}
1623
return true;
1624
}
1625
1626
error_t bring_up_interface(const char *const interface,
1627
const float delay){
1628
int sd = -1;
1629
error_t old_errno = errno;
1630
error_t ret_errno = 0;
1631
int ret, ret_setflags;
1632
struct ifreq network;
1633
unsigned int if_index = if_nametoindex(interface);
1634
if(if_index == 0){
1635
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1636
errno = old_errno;
1637
return ENXIO;
1638
}
1639
1640
if(quit_now){
1641
errno = old_errno;
1642
return EINTR;
1643
}
1644
1645
if(not interface_is_up(interface)){
1646
if(not get_flags(interface, &network) and debug){
1647
ret_errno = errno;
1648
fprintf_plus(stderr, "Failed to get flags for interface "
1649
"\"%s\"\n", interface);
1650
return ret_errno;
1651
}
1652
network.ifr_flags |= IFF_UP;
1653
1654
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1655
if(sd < 0){
1656
ret_errno = errno;
1657
perror_plus("socket");
1658
errno = old_errno;
1659
return ret_errno;
1660
}
1661
1662
if(quit_now){
1663
close(sd);
1664
errno = old_errno;
1665
return EINTR;
1666
}
1667
1668
if(debug){
1669
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1670
interface);
1671
}
1672
1673
/* Raise priviliges */
1674
raise_privileges();
1675
1676
#ifdef __linux__
1677
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1678
messages about the network interface to mess up the prompt */
1679
int ret_linux = klogctl(8, NULL, 5);
1680
bool restore_loglevel = true;
1681
if(ret_linux == -1){
1682
restore_loglevel = false;
1683
perror_plus("klogctl");
1684
}
1685
#endif /* __linux__ */
1686
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1687
ret_errno = errno;
1688
#ifdef __linux__
1689
if(restore_loglevel){
1690
ret_linux = klogctl(7, NULL, 0);
1691
if(ret_linux == -1){
1692
perror_plus("klogctl");
1693
}
1694
}
1695
#endif /* __linux__ */
1696
1697
/* Lower privileges */
1698
lower_privileges();
1699
1700
/* Close the socket */
1701
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1702
if(ret == -1){
1703
perror_plus("close");
1704
}
1705
1706
if(ret_setflags == -1){
1707
errno = ret_errno;
1708
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1709
errno = old_errno;
1710
return ret_errno;
1711
}
1712
} else if(debug){
1713
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1714
interface);
1715
}
1716
1717
/* Sleep checking until interface is running.
1718
Check every 0.25s, up to total time of delay */
1719
for(int i=0; i < delay * 4; i++){
1720
if(interface_is_running(interface)){
1721
break;
1722
}
1723
struct timespec sleeptime = { .tv_nsec = 250000000 };
1724
ret = nanosleep(&sleeptime, NULL);
1725
if(ret == -1 and errno != EINTR){
1726
perror_plus("nanosleep");
1727
}
1728
}
1729
1730
errno = old_errno;
1731
return 0;
1732
}
1733
1734
error_t take_down_interface(const char *const interface){
1735
error_t old_errno = errno;
1736
struct ifreq network;
1737
unsigned int if_index = if_nametoindex(interface);
1738
if(if_index == 0){
1739
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1740
errno = old_errno;
1741
return ENXIO;
1742
}
1743
if(interface_is_up(interface)){
1744
error_t ret_errno = 0;
1745
if(not get_flags(interface, &network) and debug){
1746
ret_errno = errno;
1747
fprintf_plus(stderr, "Failed to get flags for interface "
1748
"\"%s\"\n", interface);
1749
return ret_errno;
1750
}
1751
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1752
1753
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1754
if(sd < 0){
1755
ret_errno = errno;
1756
perror_plus("socket");
1757
errno = old_errno;
1758
return ret_errno;
1759
}
1760
1761
if(debug){
1762
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1763
interface);
1764
}
1765
1766
/* Raise priviliges */
1767
raise_privileges();
1768
1769
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1770
ret_errno = errno;
1771
1772
/* Lower privileges */
1773
lower_privileges();
1774
1775
/* Close the socket */
1776
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1777
if(ret == -1){
1778
perror_plus("close");
1779
}
1780
1781
if(ret_setflags == -1){
1782
errno = ret_errno;
1783
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1784
errno = old_errno;
1785
return ret_errno;
1786
}
1787
} else if(debug){
1788
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1789
interface);
1790
}
1791
1792
errno = old_errno;
1793
return 0;
1794
}
1795
1796
1274
int main(int argc, char *argv[]){
1797
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1798
.priority = "SECURE256:!CTYPE-X.509:"
1799
"+CTYPE-OPENPGP", .current_server = NULL,
1800
.interfaces = NULL, .interfaces_size = 0 };
1801
1275
AvahiSServiceBrowser *sb = NULL;
1802
error_t ret_errno;
1276
int error;
1803
1277
int ret;
1804
1278
intmax_t tmpmax;
1805
1279
char *tmp;
1806
1280
int exitcode = EXIT_SUCCESS;
1807
char *interfaces_to_take_down = NULL;
1808
size_t interfaces_to_take_down_size = 0;
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;
1809
1287
char tempdir[] = "/tmp/mandosXXXXXX";
1810
1288
bool tempdir_created = false;
1811
1289
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1812
1290
const char *seckey = PATHDIR "/" SECKEY;
1813
1291
const char *pubkey = PATHDIR "/" PUBKEY;
1814
char *interfaces_hooks = NULL;
1815
1292
1816
1293
bool gnutls_initialized = false;
1817
1294
bool gpgme_initialized = false;
1879
1356
.group = 2 },
1880
1357
{ .name = "retry", .key = 132,
1881
1358
.arg = "SECONDS",
1882
.doc = "Retry interval used when denied by the Mandos server",
1883
.group = 2 },
1884
{ .name = "network-hook-dir", .key = 133,
1885
.arg = "DIR",
1886
.doc = "Directory where network hooks are located",
1359
.doc = "Retry interval used when denied by the mandos server",
1887
1360
.group = 2 },
1888
1361
/*
1889
1362
* These reproduce what we would get without ARGP_NO_HELP
1908
1381
connect_to = arg;
1909
1382
break;
1910
1383
case 'i': /* --interface */
1911
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1912
arg, (int)',');
1913
if(ret_errno != 0){
1914
argp_error(state, "%s", strerror(ret_errno));
1915
}
1384
interface = arg;
1916
1385
break;
1917
1386
case 's': /* --seckey */
1918
1387
seckey = arg;
1942
1411
errno = 0;
1943
1412
retry_interval = strtod(arg, &tmp);
1944
1413
if(errno != 0 or tmp == arg or *tmp != '\0'
1945
or (retry_interval * 1000) > INT_MAX
1946
or retry_interval < 0){
1414
or (retry_interval * 1000) > INT_MAX){
1947
1415
argp_error(state, "Bad retry interval");
1948
1416
}
1949
1417
break;
1950
case 133: /* --network-hook-dir */
1951
hookdir = arg;
1952
break;
1953
1418
/*
1954
1419
* These reproduce what we would get without ARGP_NO_HELP
1955
1420
*/
1961
1426
argp_state_help(state, state->out_stream,
1962
1427
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1963
1428
case 'V': /* --version */
1964
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
1965
1430
exit(argp_err_exit_status);
1966
1431
break;
1967
1432
default:
1994
1459
{
1995
1460
/* Work around Debian bug #633582:
1996
1461
<http://bugs.debian.org/633582> */
1462
struct stat st;
1997
1463
1998
1464
/* Re-raise priviliges */
1999
if(raise_privileges() == 0){
2000
struct stat st;
2001
2002
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2003
int seckey_fd = open(seckey, O_RDONLY);
2004
if(seckey_fd == -1){
2005
perror_plus("open");
2006
} else {
2007
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2008
if(ret == -1){
2009
perror_plus("fstat");
2010
} else {
2011
if(S_ISREG(st.st_mode)
2012
and st.st_uid == 0 and st.st_gid == 0){
2013
ret = fchown(seckey_fd, uid, gid);
2014
if(ret == -1){
2015
perror_plus("fchown");
2016
}
2017
}
2018
}
2019
TEMP_FAILURE_RETRY(close(seckey_fd));
2020
}
2021
}
2022
2023
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2024
int pubkey_fd = open(pubkey, O_RDONLY);
2025
if(pubkey_fd == -1){
2026
perror_plus("open");
2027
} else {
2028
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2029
if(ret == -1){
2030
perror_plus("fstat");
2031
} else {
2032
if(S_ISREG(st.st_mode)
2033
and st.st_uid == 0 and st.st_gid == 0){
2034
ret = fchown(pubkey_fd, uid, gid);
2035
if(ret == -1){
2036
perror_plus("fchown");
2037
}
2038
}
2039
}
2040
TEMP_FAILURE_RETRY(close(pubkey_fd));
2041
}
2042
}
2043
2044
/* Lower privileges */
2045
lower_privileges();
2046
}
2047
}
2048
2049
/* Remove invalid interface names (except "none") */
2050
{
2051
char *interface = NULL;
2052
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2053
interface))){
2054
if(strcmp(interface, "none") != 0
2055
and if_nametoindex(interface) == 0){
2056
if(interface[0] != '\0'){
2057
fprintf_plus(stderr, "Not using nonexisting interface"
2058
" \"%s\"\n", interface);
2059
}
2060
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2061
interface = NULL;
2062
}
2063
}
2064
}
2065
2066
/* Run network hooks */
2067
{
2068
if(mc.interfaces != NULL){
2069
interfaces_hooks = malloc(mc.interfaces_size);
2070
if(interfaces_hooks == NULL){
2071
perror_plus("malloc");
2072
goto end;
2073
}
2074
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2075
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2076
}
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2079
goto end;
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");
2080
1512
}
2081
1513
}
2082
1514
2083
1515
if(not debug){
2084
1516
avahi_set_log_function(empty_log);
2085
1517
}
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
}
2086
1543
2087
1544
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2088
1545
from the signal handler */
2089
1546
/* Initialize the pseudo-RNG for Avahi */
2090
1547
srand((unsigned int) time(NULL));
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");
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");
2095
1551
exitcode = EX_UNAVAILABLE;
2096
1552
goto end;
2097
1553
}
2159
1615
}
2160
1616
}
2161
1617
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
errno = ret_errno;
2175
perror_plus("argz_add");
2176
continue;
2177
}
2178
if(debug){
2179
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2180
direntries[i]->d_name);
2181
}
2182
}
2183
free(direntries);
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");
1703
}
1704
}
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
break;
1723
}
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
}
2184
1754
} else {
2185
free(direntries);
2186
fprintf_plus(stderr, "Could not find a network interface\n");
2187
exitcode = EXIT_FAILURE;
2188
goto end;
2189
}
2190
}
2191
2192
/* Bring up interfaces which are down, and remove any "none"s */
2193
{
2194
char *interface = NULL;
2195
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2196
interface))){
2197
/* If interface name is "none", stop bringing up interfaces.
2198
Also remove all instances of "none" from the list */
2199
if(strcmp(interface, "none") == 0){
2200
argz_delete(&mc.interfaces, &mc.interfaces_size,
2201
interface);
2202
interface = NULL;
2203
while((interface = argz_next(mc.interfaces,
2204
mc.interfaces_size, interface))){
2205
if(strcmp(interface, "none") == 0){
2206
argz_delete(&mc.interfaces, &mc.interfaces_size,
2207
interface);
2208
interface = NULL;
2209
}
2210
}
2211
break;
2212
}
2213
bool interface_was_up = interface_is_up(interface);
2214
ret = bring_up_interface(interface, delay);
2215
if(not interface_was_up){
2216
if(ret != 0){
2217
errno = ret;
2218
perror_plus("Failed to bring up interface");
2219
} else {
2220
ret_errno = argz_add(&interfaces_to_take_down,
2221
&interfaces_to_take_down_size,
2222
interface);
2223
if(ret_errno != 0){
2224
errno = ret_errno;
2225
perror_plus("argz_add");
2226
}
2227
}
2228
}
2229
}
2230
if(debug and (interfaces_to_take_down == NULL)){
2231
fprintf_plus(stderr, "No interfaces were brought up\n");
2232
}
2233
}
2234
2235
/* If we only got one interface, explicitly use only that one */
2236
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2237
if(debug){
2238
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2239
mc.interfaces);
2240
}
2241
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1755
/* Lower privileges permanently */
1756
ret = setuid(uid);
1757
if(ret == -1){
1758
perror_plus("setuid");
1759
}
1760
}
2242
1761
}
2243
1762
2244
1763
if(quit_now){
2245
1764
goto end;
2246
1765
}
2247
1766
2248
ret = init_gnutls_global(pubkey, seckey, &mc);
1767
ret = init_gnutls_global(pubkey, seckey);
2249
1768
if(ret == -1){
2250
fprintf_plus(stderr, "init_gnutls_global failed\n");
1769
fprintf(stderr, "init_gnutls_global failed\n");
2251
1770
exitcode = EX_UNAVAILABLE;
2252
1771
goto end;
2253
1772
} else {
2268
1787
goto end;
2269
1788
}
2270
1789
2271
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2272
fprintf_plus(stderr, "init_gpgme failed\n");
1790
if(not init_gpgme(pubkey, seckey, tempdir)){
1791
fprintf(stderr, "init_gpgme failed\n");
2273
1792
exitcode = EX_UNAVAILABLE;
2274
1793
goto end;
2275
1794
} else {
2284
1803
/* Connect directly, do not use Zeroconf */
2285
1804
/* (Mainly meant for debugging) */
2286
1805
char *address = strrchr(connect_to, ':');
2287
2288
1806
if(address == NULL){
2289
fprintf_plus(stderr, "No colon in address\n");
1807
fprintf(stderr, "No colon in address\n");
2290
1808
exitcode = EX_USAGE;
2291
1809
goto end;
2292
1810
}
2295
1813
goto end;
2296
1814
}
2297
1815
2298
in_port_t port;
1816
uint16_t port;
2299
1817
errno = 0;
2300
1818
tmpmax = strtoimax(address+1, &tmp, 10);
2301
1819
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2302
or tmpmax != (in_port_t)tmpmax){
2303
fprintf_plus(stderr, "Bad port number\n");
1820
or tmpmax != (uint16_t)tmpmax){
1821
fprintf(stderr, "Bad port number\n");
2304
1822
exitcode = EX_USAGE;
2305
1823
goto end;
2306
1824
}
2307
1825
2308
1826
if(quit_now){
2309
1827
goto end;
2310
1828
}
2311
1829
2312
port = (in_port_t)tmpmax;
1830
port = (uint16_t)tmpmax;
2313
1831
*address = '\0';
1832
address = connect_to;
2314
1833
/* Colon in address indicates IPv6 */
2315
1834
int af;
2316
if(strchr(connect_to, ':') != NULL){
1835
if(strchr(address, ':') != NULL){
2317
1836
af = AF_INET6;
2318
/* Accept [] around IPv6 address - see RFC 5952 */
2319
if(connect_to[0] == '[' and address[-1] == ']')
2320
{
2321
connect_to++;
2322
address[-1] = '\0';
2323
}
2324
1837
} else {
2325
1838
af = AF_INET;
2326
1839
}
2327
address = connect_to;
2328
1840
2329
1841
if(quit_now){
2330
1842
goto end;
2331
1843
}
2332
1844
2333
1845
while(not quit_now){
2334
ret = start_mandos_communication(address, port, if_index, af,
2335
&mc);
1846
ret = start_mandos_communication(address, port, if_index, af);
2336
1847
if(quit_now or ret == 0){
2337
1848
break;
2338
1849
}
2339
if(debug){
2340
fprintf_plus(stderr, "Retrying in %d seconds\n",
2341
(int)retry_interval);
2342
}
2343
sleep((unsigned int)retry_interval);
2344
}
2345
1850
sleep((int)retry_interval or 1);
1851
};
1852
2346
1853
if (not quit_now){
2347
1854
exitcode = EXIT_SUCCESS;
2348
1855
}
2349
1856
2350
1857
goto end;
2351
1858
}
2352
1859
2364
1871
config.publish_domain = 0;
2365
1872
2366
1873
/* Allocate a new server */
2367
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2368
&config, NULL, NULL, &ret_errno);
1874
mc.server = avahi_server_new(avahi_simple_poll_get
1875
(mc.simple_poll), &config, NULL,
1876
NULL, &error);
2369
1877
2370
1878
/* Free the Avahi configuration data */
2371
1879
avahi_server_config_free(&config);
2373
1881
2374
1882
/* Check if creating the Avahi server object succeeded */
2375
1883
if(mc.server == NULL){
2376
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2377
avahi_strerror(ret_errno));
1884
fprintf(stderr, "Failed to create Avahi server: %s\n",
1885
avahi_strerror(error));
2378
1886
exitcode = EX_UNAVAILABLE;
2379
1887
goto end;
2380
1888
}
2386
1894
/* Create the Avahi service browser */
2387
1895
sb = avahi_s_service_browser_new(mc.server, if_index,
2388
1896
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2389
NULL, 0, browse_callback,
2390
(void *)&mc);
1897
NULL, 0, browse_callback, NULL);
2391
1898
if(sb == NULL){
2392
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2393
avahi_strerror(avahi_server_errno(mc.server)));
1899
fprintf(stderr, "Failed to create service browser: %s\n",
1900
avahi_strerror(avahi_server_errno(mc.server)));
2394
1901
exitcode = EX_UNAVAILABLE;
2395
1902
goto end;
2396
1903
}
2402
1909
/* Run the main loop */
2403
1910
2404
1911
if(debug){
2405
fprintf_plus(stderr, "Starting Avahi loop search\n");
1912
fprintf(stderr, "Starting Avahi loop search\n");
2406
1913
}
2407
1914
2408
ret = avahi_loop_with_timeout(simple_poll,
2409
(int)(retry_interval * 1000), &mc);
1915
ret = avahi_loop_with_timeout(mc.simple_poll,
1916
(int)(retry_interval * 1000));
2410
1917
if(debug){
2411
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2412
(ret == 0) ? "successfully" : "with error");
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
2413
1920
}
2414
1921
2415
1922
end:
2416
1923
2417
1924
if(debug){
2418
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1925
fprintf(stderr, "%s exiting\n", argv[0]);
2419
1926
}
2420
1927
2421
1928
/* Cleanup things */
2422
free(mc.interfaces);
2423
2424
1929
if(sb != NULL)
2425
1930
avahi_s_service_browser_free(sb);
2426
1931
2427
1932
if(mc.server != NULL)
2428
1933
avahi_server_free(mc.server);
2429
1934
2430
if(simple_poll != NULL)
2431
avahi_simple_poll_free(simple_poll);
1935
if(mc.simple_poll != NULL)
1936
avahi_simple_poll_free(mc.simple_poll);
2432
1937
2433
1938
if(gnutls_initialized){
2434
1939
gnutls_certificate_free_credentials(mc.cred);
2439
1944
if(gpgme_initialized){
2440
1945
gpgme_release(mc.ctx);
2441
1946
}
2442
1947
2443
1948
/* Cleans up the circular linked list of Mandos servers the client
2444
1949
has seen */
2445
1950
if(mc.current_server != NULL){
2451
1956
}
2452
1957
}
2453
1958
2454
/* Re-raise priviliges */
2455
{
2456
raise_privileges();
2457
2458
/* Run network hooks */
2459
run_network_hooks("stop", interfaces_hooks != NULL ?
2460
interfaces_hooks : "", delay);
2461
2462
/* Take down the network interfaces which were brought up */
2463
{
2464
char *interface = NULL;
2465
while((interface=argz_next(interfaces_to_take_down,
2466
interfaces_to_take_down_size,
2467
interface))){
2468
ret_errno = take_down_interface(interface);
2469
if(ret_errno != 0){
2470
errno = ret_errno;
2471
perror_plus("Failed to take down interface");
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");
2472
1976
}
2473
1977
}
2474
if(debug and (interfaces_to_take_down == NULL)){
2475
fprintf_plus(stderr, "No interfaces needed to be taken"
2476
" down\n");
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");
2477
1987
}
2478
1988
}
2479
2480
lower_privileges_permanently();
2481
1989
}
2482
1990
2483
free(interfaces_to_take_down);
2484
free(interfaces_hooks);
2485
2486
1991
/* Removes the GPGME temp directory and all files inside */
2487
1992
if(tempdir_created){
2488
1993
struct dirent **direntries = NULL;
2489
1994
struct dirent *direntry = NULL;
2490
int numentries = scandir(tempdir, &direntries, notdotentries,
2491
alphasort);
2492
if (numentries > 0){
2493
for(int i = 0; i < numentries; i++){
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1996
if (ret > 0){
1997
for(int i = 0; i < ret; i++){
2494
1998
direntry = direntries[i];
2495
1999
char *fullname = NULL;
2496
2000
ret = asprintf(&fullname, "%s/%s", tempdir,
2501
2005
}
2502
2006
ret = remove(fullname);
2503
2007
if(ret == -1){
2504
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2505
strerror(errno));
2008
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2009
strerror(errno));
2506
2010
}
2507
2011
free(fullname);
2508
2012
}
2509
2013
}
2510
2014
2511
/* need to clean even if 0 because man page doesn't specify */
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2016
specify */
2512
2017
free(direntries);
2513
if (numentries == -1){
2018
if (ret == -1){
2514
2019
perror_plus("scandir");
2515
2020
}
2516
2021
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0