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- Committer: Teddy Hogeborn
- Date: 2014-03-06 02:26:04 UTC
- Revision ID: teddy@recompile.se-20140306022604-4uc43taz25cflgi3
Bug fix: Free all memory and give better messages when memory is full.
* plugin-runner.c (add_to_char_array): Bug fix: If realloc fails, do
not change old array pointer.
(add_environment): Bug fix: If realloc fails, do not change old
environment pointer. Also rename "e" to "envdef"
for clarity.
(main): Bug fix: If realloc fails, do not change old pointers. Also
wrap "#pragma GCC" with "#ifdef ___GNUC___".
* plugins.d/mandos-client.c (incbuffer): Bug fix: if realloc fails,
free old buffer.
(run_network_hooks): Moved variables "directory" and "ret" to their
innermost possible scope.
(take_down_interface): Moved variables "sd", "ret_errno", and
"ret_setflags" to their innermost possible
scope.
(main): Removed variable "interfaces_hooks_size". Also, if argz_add
fails when adding all found interfaces, the error message
will now be correct. Also print error message if, after
having taken up an interface, argz_add fails to add
interface to list of interfaces to be taken down.
* plugins.d/mandos-client.xml (OPTIONS): Explain better what "none"
means as argument to
"--interface" by negating
sense.
* plugins.d/password-prompt.c (fprintf_plus): Removed (unused).
* plugin-runner.c (add_to_char_array): Bug fix: If realloc fails, do
not change old array pointer.
(add_environment): Bug fix: If realloc fails, do not change old
environment pointer. Also rename "e" to "envdef"
for clarity.
(main): Bug fix: If realloc fails, do not change old pointers. Also
wrap "#pragma GCC" with "#ifdef ___GNUC___".
* plugins.d/mandos-client.c (incbuffer): Bug fix: if realloc fails,
free old buffer.
(run_network_hooks): Moved variables "directory" and "ret" to their
innermost possible scope.
(take_down_interface): Moved variables "sd", "ret_errno", and
"ret_setflags" to their innermost possible
scope.
(main): Removed variable "interfaces_hooks_size". Also, if argz_add
fails when adding all found interfaces, the error message
will now be correct. Also print error message if, after
having taken up an interface, argz_add fails to add
interface to list of interfaces to be taken down.
* plugins.d/mandos-client.xml (OPTIONS): Explain better what "none"
means as argument to
"--interface" by negating
sense.
* plugins.d/password-prompt.c (fprintf_plus): Removed (unused).
- 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
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
if(buffer == NULL){
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;
183
207
return 0;
184
208
}
209
*buffer = new_buf;
185
210
buffer_capacity += BUFFER_SIZE;
186
211
}
187
212
return buffer_capacity;
188
213
}
189
214
190
215
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
216
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
217
int af, server **current_server){
194
218
int ret;
195
219
server *new_server = malloc(sizeof(server));
196
220
if(new_server == NULL){
197
221
perror_plus("malloc");
198
return -1;
222
return false;
199
223
}
200
224
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
225
.port = port,
226
.if_index = if_index,
227
.af = af };
204
228
if(new_server->ip == NULL){
205
229
perror_plus("strdup");
206
return -1;
230
return false;
207
231
}
208
232
/* Special case of first server */
209
if (mc.current_server == NULL){
233
if(*current_server == NULL){
210
234
new_server->next = new_server;
211
235
new_server->prev = new_server;
212
mc.current_server = new_server;
236
*current_server = new_server;
213
237
/* Place the new server last in the list */
214
238
} else {
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
239
new_server->next = *current_server;
240
new_server->prev = (*current_server)->prev;
217
241
new_server->prev->next = new_server;
218
mc.current_server->prev = new_server;
242
(*current_server)->prev = new_server;
219
243
}
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
244
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
221
245
if(ret == -1){
222
246
perror_plus("clock_gettime");
223
return -1;
247
return false;
224
248
}
225
return 0;
249
return true;
226
250
}
227
251
228
252
/*
229
253
* Initialize GPGME.
230
254
*/
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
255
static bool init_gpgme(const char *seckey, const char *pubkey,
256
const char *tempdir, mandos_context *mc){
233
257
gpgme_error_t rc;
234
258
gpgme_engine_info_t engine_info;
235
259
236
237
260
/*
238
261
* Helper function to insert pub and seckey to the engine keyring.
239
262
*/
250
273
251
274
rc = gpgme_data_new_from_fd(&pgp_data, fd);
252
275
if(rc != GPG_ERR_NO_ERROR){
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
254
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
255
278
return false;
256
279
}
257
280
258
rc = gpgme_op_import(mc.ctx, pgp_data);
281
rc = gpgme_op_import(mc->ctx, pgp_data);
259
282
if(rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
283
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
262
285
return false;
263
286
}
264
287
271
294
}
272
295
273
296
if(debug){
274
fprintf(stderr, "Initializing GPGME\n");
297
fprintf_plus(stderr, "Initializing GPGME\n");
275
298
}
276
299
277
300
/* Init GPGME */
278
301
gpgme_check_version(NULL);
279
302
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
280
303
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
304
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
305
gpgme_strsource(rc), gpgme_strerror(rc));
283
306
return false;
284
307
}
285
308
286
309
/* Set GPGME home directory for the OpenPGP engine only */
287
310
rc = gpgme_get_engine_info(&engine_info);
288
311
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
312
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
313
gpgme_strsource(rc), gpgme_strerror(rc));
291
314
return false;
292
315
}
293
316
while(engine_info != NULL){
299
322
engine_info = engine_info->next;
300
323
}
301
324
if(engine_info == NULL){
302
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
325
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
326
tempdir);
303
327
return false;
304
328
}
305
329
306
330
/* Create new GPGME "context" */
307
rc = gpgme_new(&(mc.ctx));
331
rc = gpgme_new(&(mc->ctx));
308
332
if(rc != GPG_ERR_NO_ERROR){
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
333
fprintf_plus(stderr, "Mandos plugin mandos-client: "
334
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
335
gpgme_strerror(rc));
311
336
return false;
312
337
}
313
338
324
349
*/
325
350
static ssize_t pgp_packet_decrypt(const char *cryptotext,
326
351
size_t crypto_size,
327
char **plaintext){
352
char **plaintext,
353
mandos_context *mc){
328
354
gpgme_data_t dh_crypto, dh_plain;
329
355
gpgme_error_t rc;
330
356
ssize_t ret;
332
358
ssize_t plaintext_length = 0;
333
359
334
360
if(debug){
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
361
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
362
}
337
363
338
364
/* Create new GPGME data buffer from memory cryptotext */
339
365
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
340
366
0);
341
367
if(rc != GPG_ERR_NO_ERROR){
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
gpgme_strsource(rc), gpgme_strerror(rc));
368
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
369
gpgme_strsource(rc), gpgme_strerror(rc));
344
370
return -1;
345
371
}
346
372
347
373
/* Create new empty GPGME data buffer for the plaintext */
348
374
rc = gpgme_data_new(&dh_plain);
349
375
if(rc != GPG_ERR_NO_ERROR){
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
gpgme_strsource(rc), gpgme_strerror(rc));
376
fprintf_plus(stderr, "Mandos plugin mandos-client: "
377
"bad gpgme_data_new: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
352
379
gpgme_data_release(dh_crypto);
353
380
return -1;
354
381
}
355
382
356
383
/* Decrypt data from the cryptotext data buffer to the plaintext
357
384
data buffer */
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
385
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
359
386
if(rc != GPG_ERR_NO_ERROR){
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
387
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
362
389
plaintext_length = -1;
363
390
if(debug){
364
391
gpgme_decrypt_result_t result;
365
result = gpgme_op_decrypt_result(mc.ctx);
392
result = gpgme_op_decrypt_result(mc->ctx);
366
393
if(result == NULL){
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
394
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
395
} else {
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
result->wrong_key_usage);
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);
373
400
if(result->file_name != NULL){
374
fprintf(stderr, "File name: %s\n", result->file_name);
401
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
402
}
376
403
gpgme_recipient_t recipient;
377
404
recipient = result->recipients;
378
405
while(recipient != NULL){
379
fprintf(stderr, "Public key algorithm: %s\n",
380
gpgme_pubkey_algo_name(recipient->pubkey_algo));
381
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
382
fprintf(stderr, "Secret key available: %s\n",
383
recipient->status == GPG_ERR_NO_SECKEY
384
? "No" : "Yes");
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");
385
413
recipient = recipient->next;
386
414
}
387
415
}
390
418
}
391
419
392
420
if(debug){
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
421
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
394
422
}
395
423
396
424
/* Seek back to the beginning of the GPGME plaintext data buffer */
403
431
*plaintext = NULL;
404
432
while(true){
405
433
plaintext_capacity = incbuffer(plaintext,
406
(size_t)plaintext_length,
407
plaintext_capacity);
434
(size_t)plaintext_length,
435
plaintext_capacity);
408
436
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
410
plaintext_length = -1;
411
goto decrypt_end;
437
perror_plus("incbuffer");
438
plaintext_length = -1;
439
goto decrypt_end;
412
440
}
413
441
414
442
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
427
455
}
428
456
429
457
if(debug){
430
fprintf(stderr, "Decrypted password is: ");
458
fprintf_plus(stderr, "Decrypted password is: ");
431
459
for(ssize_t i = 0; i < plaintext_length; i++){
432
460
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
433
461
}
445
473
}
446
474
447
475
static const char * safer_gnutls_strerror(int value){
448
const char *ret = gnutls_strerror(value); /* Spurious warning from
449
-Wunreachable-code */
476
const char *ret = gnutls_strerror(value);
450
477
if(ret == NULL)
451
478
ret = "(unknown)";
452
479
return ret;
455
482
/* GnuTLS log function callback */
456
483
static void debuggnutls(__attribute__((unused)) int level,
457
484
const char* string){
458
fprintf(stderr, "GnuTLS: %s", string);
485
fprintf_plus(stderr, "GnuTLS: %s", string);
459
486
}
460
487
461
488
static int init_gnutls_global(const char *pubkeyfilename,
462
const char *seckeyfilename){
489
const char *seckeyfilename,
490
mandos_context *mc){
463
491
int ret;
464
492
465
493
if(debug){
466
fprintf(stderr, "Initializing GnuTLS\n");
494
fprintf_plus(stderr, "Initializing GnuTLS\n");
467
495
}
468
496
469
497
ret = gnutls_global_init();
470
498
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
499
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
500
safer_gnutls_strerror(ret));
473
501
return -1;
474
502
}
475
503
482
510
}
483
511
484
512
/* OpenPGP credentials */
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
513
ret = gnutls_certificate_allocate_credentials(&mc->cred);
486
514
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
515
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
516
safer_gnutls_strerror(ret));
489
517
gnutls_global_deinit();
490
518
return -1;
491
519
}
492
520
493
521
if(debug){
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
seckeyfilename);
522
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
523
" secret key %s as GnuTLS credentials\n",
524
pubkeyfilename,
525
seckeyfilename);
497
526
}
498
527
499
528
ret = gnutls_certificate_set_openpgp_key_file
500
(mc.cred, pubkeyfilename, seckeyfilename,
529
(mc->cred, pubkeyfilename, seckeyfilename,
501
530
GNUTLS_OPENPGP_FMT_BASE64);
502
531
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr,
504
"Error[%d] while reading the OpenPGP key pair ('%s',"
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
506
fprintf(stderr, "The GnuTLS error is: %s\n",
507
safer_gnutls_strerror(ret));
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));
508
537
goto globalfail;
509
538
}
510
539
511
540
/* GnuTLS server initialization */
512
ret = gnutls_dh_params_init(&mc.dh_params);
541
ret = gnutls_dh_params_init(&mc->dh_params);
513
542
if(ret != GNUTLS_E_SUCCESS){
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
543
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
544
" initialization: %s\n",
545
safer_gnutls_strerror(ret));
516
546
goto globalfail;
517
547
}
518
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
548
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
519
549
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
550
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
551
safer_gnutls_strerror(ret));
522
552
goto globalfail;
523
553
}
524
554
525
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
555
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
526
556
527
557
return 0;
528
558
529
559
globalfail:
530
560
531
gnutls_certificate_free_credentials(mc.cred);
561
gnutls_certificate_free_credentials(mc->cred);
532
562
gnutls_global_deinit();
533
gnutls_dh_params_deinit(mc.dh_params);
563
gnutls_dh_params_deinit(mc->dh_params);
534
564
return -1;
535
565
}
536
566
537
static int init_gnutls_session(gnutls_session_t *session){
567
static int init_gnutls_session(gnutls_session_t *session,
568
mandos_context *mc){
538
569
int ret;
539
570
/* GnuTLS session creation */
540
571
do {
544
575
}
545
576
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
546
577
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
safer_gnutls_strerror(ret));
578
fprintf_plus(stderr,
579
"Error in GnuTLS session initialization: %s\n",
580
safer_gnutls_strerror(ret));
549
581
}
550
582
551
583
{
552
584
const char *err;
553
585
do {
554
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
586
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
555
587
if(quit_now){
556
588
gnutls_deinit(*session);
557
589
return -1;
558
590
}
559
591
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
560
592
if(ret != GNUTLS_E_SUCCESS){
561
fprintf(stderr, "Syntax error at: %s\n", err);
562
fprintf(stderr, "GnuTLS error: %s\n",
563
safer_gnutls_strerror(ret));
593
fprintf_plus(stderr, "Syntax error at: %s\n", err);
594
fprintf_plus(stderr, "GnuTLS error: %s\n",
595
safer_gnutls_strerror(ret));
564
596
gnutls_deinit(*session);
565
597
return -1;
566
598
}
568
600
569
601
do {
570
602
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
571
mc.cred);
603
mc->cred);
572
604
if(quit_now){
573
605
gnutls_deinit(*session);
574
606
return -1;
575
607
}
576
608
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
577
609
if(ret != GNUTLS_E_SUCCESS){
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
safer_gnutls_strerror(ret));
610
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
611
safer_gnutls_strerror(ret));
580
612
gnutls_deinit(*session);
581
613
return -1;
582
614
}
584
616
/* ignore client certificate if any. */
585
617
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
586
618
587
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
619
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
588
620
589
621
return 0;
590
622
}
594
626
__attribute__((unused)) const char *txt){}
595
627
596
628
/* Called when a Mandos server is found */
597
static int start_mandos_communication(const char *ip, uint16_t port,
629
static int start_mandos_communication(const char *ip, in_port_t port,
598
630
AvahiIfIndex if_index,
599
int af){
631
int af, mandos_context *mc){
600
632
int ret, tcp_sd = -1;
601
633
ssize_t sret;
602
634
union {
627
659
pf = PF_INET;
628
660
break;
629
661
default:
630
fprintf(stderr, "Bad address family: %d\n", af);
662
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
663
errno = EINVAL;
632
664
return -1;
633
665
}
634
666
635
ret = init_gnutls_session(&session);
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);
636
700
if(ret != 0){
637
701
return -1;
638
702
}
639
703
640
704
if(debug){
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
705
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
706
PRIuMAX "\n", ip, (uintmax_t)port);
643
707
}
644
708
645
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
735
}
672
736
if(ret == 0){
673
737
int e = errno;
674
fprintf(stderr, "Bad address: %s\n", ip);
738
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
739
errno = e;
676
740
goto mandos_end;
677
741
}
678
742
if(af == AF_INET6){
679
to.in6.sin6_port = htons(port); /* Spurious warnings from
680
-Wconversion and
681
-Wunreachable-code */
682
743
to.in6.sin6_port = htons(port);
744
#ifdef __GNUC__
745
#pragma GCC diagnostic push
746
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
747
#endif
683
748
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
684
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
685
-Wunreachable-code*/
749
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
750
#ifdef __GNUC__
751
#pragma GCC diagnostic pop
752
#endif
686
753
if(if_index == AVAHI_IF_UNSPEC){
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
754
fprintf_plus(stderr, "An IPv6 link-local address is"
755
" incomplete without a network interface\n");
689
756
errno = EINVAL;
690
757
goto mandos_end;
691
758
}
693
760
to.in6.sin6_scope_id = (uint32_t)if_index;
694
761
}
695
762
} else {
696
to.in.sin_port = htons(port); /* Spurious warnings from
697
-Wconversion and
698
-Wunreachable-code */
763
to.in.sin_port = htons(port);
699
764
}
700
765
701
766
if(quit_now){
709
774
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
775
perror_plus("if_indextoname");
711
776
} else {
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
777
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
778
"\n", ip, interface, (uintmax_t)port);
714
779
}
715
780
} else {
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
781
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
782
ip, (uintmax_t)port);
718
783
}
719
784
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
720
785
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
730
795
perror_plus("inet_ntop");
731
796
} else {
732
797
if(strcmp(addrstr, ip) != 0){
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
798
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
734
799
}
735
800
}
736
801
}
764
829
while(true){
765
830
size_t out_size = strlen(out);
766
831
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
out_size - written));
832
out_size - written));
768
833
if(ret == -1){
769
834
int e = errno;
770
835
perror_plus("write");
790
855
}
791
856
792
857
if(debug){
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
858
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
859
}
795
860
796
861
if(quit_now){
798
863
goto mandos_end;
799
864
}
800
865
801
/* Spurious warning from -Wint-to-pointer-cast */
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
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);
803
871
804
872
if(quit_now){
805
873
errno = EINTR;
816
884
817
885
if(ret != GNUTLS_E_SUCCESS){
818
886
if(debug){
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
887
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
888
gnutls_perror(ret);
821
889
}
822
890
errno = EPROTO;
826
894
/* Read OpenPGP packet that contains the wanted password */
827
895
828
896
if(debug){
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
830
ip);
897
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
898
" %s\n", ip);
831
899
}
832
900
833
901
while(true){
838
906
}
839
907
840
908
buffer_capacity = incbuffer(&buffer, buffer_length,
841
buffer_capacity);
909
buffer_capacity);
842
910
if(buffer_capacity == 0){
843
911
int e = errno;
844
912
perror_plus("incbuffer");
871
939
}
872
940
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
873
941
if(ret < 0){
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
942
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
943
"***\n");
875
944
gnutls_perror(ret);
876
945
errno = EPROTO;
877
946
goto mandos_end;
878
947
}
879
948
break;
880
949
default:
881
fprintf(stderr, "Unknown error while reading data from"
882
" encrypted session with Mandos server\n");
950
fprintf_plus(stderr, "Unknown error while reading data from"
951
" encrypted session with Mandos server\n");
883
952
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
953
errno = EIO;
885
954
goto mandos_end;
890
959
}
891
960
892
961
if(debug){
893
fprintf(stderr, "Closing TLS session\n");
962
fprintf_plus(stderr, "Closing TLS session\n");
894
963
}
895
964
896
965
if(quit_now){
908
977
909
978
if(buffer_length > 0){
910
979
ssize_t decrypted_buffer_size;
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
buffer_length,
913
&decrypted_buffer);
980
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
981
&decrypted_buffer, mc);
914
982
if(decrypted_buffer_size >= 0){
915
983
916
984
written = 0;
926
994
if(ret == 0 and ferror(stdout)){
927
995
int e = errno;
928
996
if(debug){
929
fprintf(stderr, "Error writing encrypted data: %s\n",
930
strerror(errno));
997
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
998
strerror(errno));
931
999
}
932
1000
errno = e;
933
1001
goto mandos_end;
977
1045
AVAHI_GCC_UNUSED AvahiStringList *txt,
978
1046
AVAHI_GCC_UNUSED AvahiLookupResultFlags
979
1047
flags,
980
AVAHI_GCC_UNUSED void* userdata){
981
assert(r);
1048
void* mc){
1049
if(r == NULL){
1050
return;
1051
}
982
1052
983
1053
/* Called whenever a service has been resolved successfully or
984
1054
timed out */
990
1060
switch(event){
991
1061
default:
992
1062
case AVAHI_RESOLVER_FAILURE:
993
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
994
" of type '%s' in domain '%s': %s\n", name, type, domain,
995
avahi_strerror(avahi_server_errno(mc.server)));
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)));
996
1068
break;
997
1069
998
1070
case AVAHI_RESOLVER_FOUND:
1000
1072
char ip[AVAHI_ADDRESS_STR_MAX];
1001
1073
avahi_address_snprint(ip, sizeof(ip), address);
1002
1074
if(debug){
1003
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1005
ip, (intmax_t)interface, port);
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);
1006
1078
}
1007
int ret = start_mandos_communication(ip, port, interface,
1008
avahi_proto_to_af(proto));
1079
int ret = start_mandos_communication(ip, (in_port_t)port,
1080
interface,
1081
avahi_proto_to_af(proto),
1082
mc);
1009
1083
if(ret == 0){
1010
avahi_simple_poll_quit(mc.simple_poll);
1084
avahi_simple_poll_quit(simple_poll);
1011
1085
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
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
}
1014
1092
}
1015
1093
}
1016
1094
}
1026
1104
const char *domain,
1027
1105
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1028
1106
flags,
1029
AVAHI_GCC_UNUSED void* userdata){
1030
assert(b);
1107
void* mc){
1108
if(b == NULL){
1109
return;
1110
}
1031
1111
1032
1112
/* Called whenever a new services becomes available on the LAN or
1033
1113
is removed from the LAN */
1040
1120
default:
1041
1121
case AVAHI_BROWSER_FAILURE:
1042
1122
1043
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1045
avahi_simple_poll_quit(mc.simple_poll);
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);
1046
1127
return;
1047
1128
1048
1129
case AVAHI_BROWSER_NEW:
1051
1132
the callback function is called the Avahi server will free the
1052
1133
resolver for us. */
1053
1134
1054
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1055
name, type, domain, protocol, 0,
1056
resolve_callback, NULL) == NULL)
1057
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
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)));
1059
1143
break;
1060
1144
1061
1145
case AVAHI_BROWSER_REMOVE:
1064
1148
case AVAHI_BROWSER_ALL_FOR_NOW:
1065
1149
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1066
1150
if(debug){
1067
fprintf(stderr, "No Mandos server found, still searching...\n");
1151
fprintf_plus(stderr, "No Mandos server found, still"
1152
" searching...\n");
1068
1153
}
1069
1154
break;
1070
1155
}
1079
1164
signal_received = sig;
1080
1165
int old_errno = errno;
1081
1166
/* set main loop to exit */
1082
if(mc.simple_poll != NULL){
1083
avahi_simple_poll_quit(mc.simple_poll);
1167
if(simple_poll != NULL){
1168
avahi_simple_poll_quit(simple_poll);
1084
1169
}
1085
1170
errno = old_errno;
1086
1171
}
1087
1172
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){
1187
if(debug){
1188
ret_errno = errno;
1189
perror_plus("ioctl SIOCGIFFLAGS");
1190
errno = ret_errno;
1191
}
1192
return false;
1193
}
1194
return true;
1195
}
1196
1197
bool good_flags(const char *ifname, const struct ifreq *ifr){
1198
1199
/* Reject the loopback device */
1200
if(ifr->ifr_flags & IFF_LOOPBACK){
1201
if(debug){
1202
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1203
ifname);
1204
}
1205
return false;
1206
}
1207
/* Accept point-to-point devices only if connect_to is specified */
1208
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1209
if(debug){
1210
fprintf_plus(stderr, "Accepting point-to-point interface"
1211
" \"%s\"\n", ifname);
1212
}
1213
return true;
1214
}
1215
/* Otherwise, reject non-broadcast-capable devices */
1216
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1219
" \"%s\"\n", ifname);
1220
}
1221
return false;
1222
}
1223
/* Reject non-ARP interfaces (including dummy interfaces) */
1224
if(ifr->ifr_flags & IFF_NOARP){
1225
if(debug){
1226
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1227
ifname);
1228
}
1229
return false;
1230
}
1231
1232
/* Accept this device */
1233
if(debug){
1234
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1235
}
1236
return true;
1237
}
1238
1088
1239
/*
1089
1240
* This function determines if a directory entry in /sys/class/net
1090
1241
* corresponds to an acceptable network device.
1091
1242
* (This function is passed to scandir(3) as a filter function.)
1092
1243
*/
1093
1244
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
char *flagname = NULL;
1096
1245
if(if_entry->d_name[0] == '.'){
1097
1246
return 0;
1098
1247
}
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1100
if_entry->d_name);
1101
if(ret < 0){
1102
perror_plus("asprintf");
1103
return 0;
1104
}
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
if(flags_fd == -1){
1107
perror_plus("open");
1108
free(flagname);
1109
return 0;
1110
}
1111
free(flagname);
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
flagstring[(size_t)to_read] = '\0';
1117
if(flagstring == NULL){
1118
perror_plus("malloc");
1119
close(flags_fd);
1120
return 0;
1121
}
1122
while(to_read > 0){
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1124
(size_t)to_read));
1125
if(ssret == -1){
1126
perror_plus("read");
1127
free(flagstring);
1128
close(flags_fd);
1129
return 0;
1130
}
1131
to_read -= ssret;
1132
if(ssret == 0){
1133
break;
1134
}
1135
}
1136
close(flags_fd);
1137
intmax_t tmpmax;
1138
char *tmp;
1139
errno = 0;
1140
tmpmax = strtoimax(flagstring, &tmp, 0);
1141
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1142
and not (isspace(*tmp)))
1143
or tmpmax != (ifreq_flags)tmpmax){
1144
if(debug){
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1147
}
1148
free(flagstring);
1149
return 0;
1150
}
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1153
/* Reject the loopback device */
1154
if(flags & IFF_LOOPBACK){
1155
if(debug){
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1158
}
1159
return 0;
1160
}
1161
/* Accept point-to-point devices only if connect_to is specified */
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1163
if(debug){
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 1;
1168
}
1169
/* Otherwise, reject non-broadcast-capable devices */
1170
if(not (flags & IFF_BROADCAST)){
1171
if(debug){
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1174
}
1175
return 0;
1176
}
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1178
if(flags & IFF_NOARP){
1179
if(debug){
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1182
}
1183
return 0;
1184
}
1185
/* Accept this device */
1186
if(debug){
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
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;
1189
1260
}
1190
1261
return 1;
1191
1262
}
1192
1263
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
1193
1296
int notdotentries(const struct dirent *direntry){
1194
1297
/* Skip "." and ".." */
1195
1298
if(direntry->d_name[0] == '.'
1201
1304
return 1;
1202
1305
}
1203
1306
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
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){
1205
1370
int ret;
1206
1371
struct timespec now;
1207
1372
struct timespec waited_time;
1208
1373
intmax_t block_time;
1209
1374
1210
1375
while(true){
1211
if(mc.current_server == NULL){
1376
if(mc->current_server == NULL){
1212
1377
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1378
fprintf_plus(stderr, "Wait until first server is found."
1379
" No timeout!\n");
1215
1380
}
1216
1381
ret = avahi_simple_poll_iterate(s, -1);
1217
1382
} else {
1218
1383
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1384
fprintf_plus(stderr, "Check current_server if we should run"
1385
" it, or wait\n");
1221
1386
}
1222
1387
/* the current time */
1223
1388
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1228
1393
/* Calculating in ms how long time between now and server
1229
1394
who we visted longest time ago. Now - last seen. */
1230
1395
waited_time.tv_sec = (now.tv_sec
1231
- mc.current_server->last_seen.tv_sec);
1396
- mc->current_server->last_seen.tv_sec);
1232
1397
waited_time.tv_nsec = (now.tv_nsec
1233
- mc.current_server->last_seen.tv_nsec);
1398
- mc->current_server->last_seen.tv_nsec);
1234
1399
/* total time is 10s/10,000ms.
1235
1400
Converting to s from ms by dividing by 1,000,
1236
1401
and ns to ms by dividing by 1,000,000. */
1239
1404
- ((intmax_t)waited_time.tv_nsec / 1000000));
1240
1405
1241
1406
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1407
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1408
block_time);
1243
1409
}
1244
1410
1245
1411
if(block_time <= 0){
1246
ret = start_mandos_communication(mc.current_server->ip,
1247
mc.current_server->port,
1248
mc.current_server->if_index,
1249
mc.current_server->af);
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);
1250
1416
if(ret == 0){
1251
avahi_simple_poll_quit(mc.simple_poll);
1417
avahi_simple_poll_quit(s);
1252
1418
return 0;
1253
1419
}
1254
1420
ret = clock_gettime(CLOCK_MONOTONIC,
1255
&mc.current_server->last_seen);
1421
&mc->current_server->last_seen);
1256
1422
if(ret == -1){
1257
1423
perror_plus("clock_gettime");
1258
1424
return -1;
1259
1425
}
1260
mc.current_server = mc.current_server->next;
1426
mc->current_server = mc->current_server->next;
1261
1427
block_time = 0; /* Call avahi to find new Mandos
1262
1428
servers, but don't block */
1263
1429
}
1265
1431
ret = avahi_simple_poll_iterate(s, (int)block_time);
1266
1432
}
1267
1433
if(ret != 0){
1268
if (ret > 0 or errno != EINTR) {
1434
if (ret > 0 or errno != EINTR){
1269
1435
return (ret != 1) ? ret : 0;
1270
1436
}
1271
1437
}
1272
1438
}
1273
1439
}
1274
1440
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
1275
1796
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 };
1276
1801
AvahiSServiceBrowser *sb = NULL;
1277
int error;
1802
error_t ret_errno;
1278
1803
int ret;
1279
1804
intmax_t tmpmax;
1280
1805
char *tmp;
1281
1806
int exitcode = EXIT_SUCCESS;
1282
const char *interface = "";
1283
struct ifreq network;
1284
int sd = -1;
1285
bool take_down_interface = false;
1286
uid_t uid;
1287
gid_t gid;
1807
char *interfaces_to_take_down = NULL;
1808
size_t interfaces_to_take_down_size = 0;
1288
1809
char tempdir[] = "/tmp/mandosXXXXXX";
1289
1810
bool tempdir_created = false;
1290
1811
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1291
1812
const char *seckey = PATHDIR "/" SECKEY;
1292
1813
const char *pubkey = PATHDIR "/" PUBKEY;
1814
char *interfaces_hooks = NULL;
1293
1815
1294
1816
bool gnutls_initialized = false;
1295
1817
bool gpgme_initialized = false;
1357
1879
.group = 2 },
1358
1880
{ .name = "retry", .key = 132,
1359
1881
.arg = "SECONDS",
1360
.doc = "Retry interval used when denied by the mandos server",
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",
1361
1887
.group = 2 },
1362
1888
/*
1363
1889
* These reproduce what we would get without ARGP_NO_HELP
1382
1908
connect_to = arg;
1383
1909
break;
1384
1910
case 'i': /* --interface */
1385
interface = arg;
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
}
1386
1916
break;
1387
1917
case 's': /* --seckey */
1388
1918
seckey = arg;
1417
1947
argp_error(state, "Bad retry interval");
1418
1948
}
1419
1949
break;
1950
case 133: /* --network-hook-dir */
1951
hookdir = arg;
1952
break;
1420
1953
/*
1421
1954
* These reproduce what we would get without ARGP_NO_HELP
1422
1955
*/
1428
1961
argp_state_help(state, state->out_stream,
1429
1962
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1430
1963
case 'V': /* --version */
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
1964
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1432
1965
exit(argp_err_exit_status);
1433
1966
break;
1434
1967
default:
1461
1994
{
1462
1995
/* Work around Debian bug #633582:
1463
1996
<http://bugs.debian.org/633582> */
1464
struct stat st;
1465
1997
1466
1998
/* Re-raise priviliges */
1467
errno = 0;
1468
ret = seteuid(0);
1469
if(ret == -1){
1470
perror_plus("seteuid");
1471
}
1472
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1477
} else {
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
if(ret == -1){
1480
perror_plus("fstat");
1481
} else {
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1484
if(ret == -1){
1485
perror_plus("fchown");
1486
}
1487
}
1488
}
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1490
}
1491
}
1492
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1497
} else {
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1499
if(ret == -1){
1500
perror_plus("fstat");
1501
} else {
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1504
if(ret == -1){
1505
perror_plus("fchown");
1506
}
1507
}
1508
}
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1510
}
1511
}
1512
1513
/* Lower privileges */
1514
errno = 0;
1515
ret = seteuid(uid);
1516
if(ret == -1){
1517
perror_plus("seteuid");
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;
1518
2080
}
1519
2081
}
1520
2082
1521
2083
if(not debug){
1522
2084
avahi_set_log_function(empty_log);
1523
2085
}
1524
1525
if(interface[0] == '\0'){
1526
struct dirent **direntries;
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1528
alphasort);
1529
if(ret >= 1){
1530
/* Pick the first good interface */
1531
interface = strdup(direntries[0]->d_name);
1532
if(debug){
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1534
}
1535
if(interface == NULL){
1536
perror_plus("malloc");
1537
free(direntries);
1538
exitcode = EXIT_FAILURE;
1539
goto end;
1540
}
1541
free(direntries);
1542
} else {
1543
free(direntries);
1544
fprintf(stderr, "Could not find a network interface\n");
1545
exitcode = EXIT_FAILURE;
1546
goto end;
1547
}
1548
}
1549
2086
1550
2087
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1551
2088
from the signal handler */
1552
2089
/* Initialize the pseudo-RNG for Avahi */
1553
2090
srand((unsigned int) time(NULL));
1554
mc.simple_poll = avahi_simple_poll_new();
1555
if(mc.simple_poll == NULL){
1556
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");
1557
2095
exitcode = EX_UNAVAILABLE;
1558
2096
goto end;
1559
2097
}
1621
2159
}
1622
2160
}
1623
2161
1624
/* If the interface is down, bring it up */
1625
if(strcmp(interface, "none") != 0){
1626
if_index = (AvahiIfIndex) if_nametoindex(interface);
1627
if(if_index == 0){
1628
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1629
exitcode = EX_UNAVAILABLE;
1630
goto end;
1631
}
1632
1633
if(quit_now){
1634
goto end;
1635
}
1636
1637
/* Re-raise priviliges */
1638
errno = 0;
1639
ret = seteuid(0);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
1644
#ifdef __linux__
1645
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1646
messages about the network interface to mess up the prompt */
1647
ret = klogctl(8, NULL, 5);
1648
bool restore_loglevel = true;
1649
if(ret == -1){
1650
restore_loglevel = false;
1651
perror_plus("klogctl");
1652
}
1653
#endif /* __linux__ */
1654
1655
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1656
if(sd < 0){
1657
perror_plus("socket");
1658
exitcode = EX_OSERR;
1659
#ifdef __linux__
1660
if(restore_loglevel){
1661
ret = klogctl(7, NULL, 0);
1662
if(ret == -1){
1663
perror_plus("klogctl");
1664
}
1665
}
1666
#endif /* __linux__ */
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
goto end;
1674
}
1675
strcpy(network.ifr_name, interface);
1676
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1677
if(ret == -1){
1678
perror_plus("ioctl SIOCGIFFLAGS");
1679
#ifdef __linux__
1680
if(restore_loglevel){
1681
ret = klogctl(7, NULL, 0);
1682
if(ret == -1){
1683
perror_plus("klogctl");
1684
}
1685
}
1686
#endif /* __linux__ */
1687
exitcode = EX_OSERR;
1688
/* Lower privileges */
1689
errno = 0;
1690
ret = seteuid(uid);
1691
if(ret == -1){
1692
perror_plus("seteuid");
1693
}
1694
goto end;
1695
}
1696
if((network.ifr_flags & IFF_UP) == 0){
1697
network.ifr_flags |= IFF_UP;
1698
take_down_interface = true;
1699
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1700
if(ret == -1){
1701
take_down_interface = false;
1702
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1703
exitcode = EX_OSERR;
1704
#ifdef __linux__
1705
if(restore_loglevel){
1706
ret = klogctl(7, NULL, 0);
1707
if(ret == -1){
1708
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
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);
2184
} 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;
1709
2209
}
1710
2210
}
1711
#endif /* __linux__ */
1712
/* Lower privileges */
1713
errno = 0;
1714
ret = seteuid(uid);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
}
1718
goto end;
1719
}
1720
}
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
1724
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1725
if(ret == -1){
1726
perror_plus("ioctl SIOCGIFFLAGS");
1727
} else if(network.ifr_flags & IFF_RUNNING){
1728
2211
break;
1729
2212
}
1730
struct timespec sleeptime = { .tv_nsec = 250000000 };
1731
ret = nanosleep(&sleeptime, NULL);
1732
if(ret == -1 and errno != EINTR){
1733
perror_plus("nanosleep");
1734
}
1735
}
1736
if(not take_down_interface){
1737
/* We won't need the socket anymore */
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
if(ret == -1){
1740
perror_plus("close");
1741
}
1742
}
1743
#ifdef __linux__
1744
if(restore_loglevel){
1745
/* Restores kernel loglevel to default */
1746
ret = klogctl(7, NULL, 0);
1747
if(ret == -1){
1748
perror_plus("klogctl");
1749
}
1750
}
1751
#endif /* __linux__ */
1752
/* Lower privileges */
1753
errno = 0;
1754
if(take_down_interface){
1755
/* Lower privileges */
1756
ret = seteuid(uid);
1757
if(ret == -1){
1758
perror_plus("seteuid");
1759
}
1760
} else {
1761
/* Lower privileges permanently */
1762
ret = setuid(uid);
1763
if(ret == -1){
1764
perror_plus("setuid");
1765
}
1766
}
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);
1767
2242
}
1768
2243
1769
2244
if(quit_now){
1770
2245
goto end;
1771
2246
}
1772
2247
1773
ret = init_gnutls_global(pubkey, seckey);
2248
ret = init_gnutls_global(pubkey, seckey, &mc);
1774
2249
if(ret == -1){
1775
fprintf(stderr, "init_gnutls_global failed\n");
2250
fprintf_plus(stderr, "init_gnutls_global failed\n");
1776
2251
exitcode = EX_UNAVAILABLE;
1777
2252
goto end;
1778
2253
} else {
1793
2268
goto end;
1794
2269
}
1795
2270
1796
if(not init_gpgme(pubkey, seckey, tempdir)){
1797
fprintf(stderr, "init_gpgme failed\n");
2271
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2272
fprintf_plus(stderr, "init_gpgme failed\n");
1798
2273
exitcode = EX_UNAVAILABLE;
1799
2274
goto end;
1800
2275
} else {
1809
2284
/* Connect directly, do not use Zeroconf */
1810
2285
/* (Mainly meant for debugging) */
1811
2286
char *address = strrchr(connect_to, ':');
2287
1812
2288
if(address == NULL){
1813
fprintf(stderr, "No colon in address\n");
2289
fprintf_plus(stderr, "No colon in address\n");
1814
2290
exitcode = EX_USAGE;
1815
2291
goto end;
1816
2292
}
1819
2295
goto end;
1820
2296
}
1821
2297
1822
uint16_t port;
2298
in_port_t port;
1823
2299
errno = 0;
1824
2300
tmpmax = strtoimax(address+1, &tmp, 10);
1825
2301
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1826
or tmpmax != (uint16_t)tmpmax){
1827
fprintf(stderr, "Bad port number\n");
2302
or tmpmax != (in_port_t)tmpmax){
2303
fprintf_plus(stderr, "Bad port number\n");
1828
2304
exitcode = EX_USAGE;
1829
2305
goto end;
1830
2306
}
1831
2307
1832
2308
if(quit_now){
1833
2309
goto end;
1834
2310
}
1835
2311
1836
port = (uint16_t)tmpmax;
2312
port = (in_port_t)tmpmax;
1837
2313
*address = '\0';
1838
2314
/* Colon in address indicates IPv6 */
1839
2315
int af;
1855
2331
}
1856
2332
1857
2333
while(not quit_now){
1858
ret = start_mandos_communication(address, port, if_index, af);
2334
ret = start_mandos_communication(address, port, if_index, af,
2335
&mc);
1859
2336
if(quit_now or ret == 0){
1860
2337
break;
1861
2338
}
1862
2339
if(debug){
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
2340
fprintf_plus(stderr, "Retrying in %d seconds\n",
2341
(int)retry_interval);
1865
2342
}
1866
sleep((int)retry_interval);
2343
sleep((unsigned int)retry_interval);
1867
2344
}
1868
2345
1869
2346
if (not quit_now){
1870
2347
exitcode = EXIT_SUCCESS;
1871
2348
}
1872
2349
1873
2350
goto end;
1874
2351
}
1875
2352
1887
2364
config.publish_domain = 0;
1888
2365
1889
2366
/* Allocate a new server */
1890
mc.server = avahi_server_new(avahi_simple_poll_get
1891
(mc.simple_poll), &config, NULL,
1892
NULL, &error);
2367
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2368
&config, NULL, NULL, &ret_errno);
1893
2369
1894
2370
/* Free the Avahi configuration data */
1895
2371
avahi_server_config_free(&config);
1897
2373
1898
2374
/* Check if creating the Avahi server object succeeded */
1899
2375
if(mc.server == NULL){
1900
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
avahi_strerror(error));
2376
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2377
avahi_strerror(ret_errno));
1902
2378
exitcode = EX_UNAVAILABLE;
1903
2379
goto end;
1904
2380
}
1910
2386
/* Create the Avahi service browser */
1911
2387
sb = avahi_s_service_browser_new(mc.server, if_index,
1912
2388
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1913
NULL, 0, browse_callback, NULL);
2389
NULL, 0, browse_callback,
2390
(void *)&mc);
1914
2391
if(sb == NULL){
1915
fprintf(stderr, "Failed to create service browser: %s\n",
1916
avahi_strerror(avahi_server_errno(mc.server)));
2392
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2393
avahi_strerror(avahi_server_errno(mc.server)));
1917
2394
exitcode = EX_UNAVAILABLE;
1918
2395
goto end;
1919
2396
}
1925
2402
/* Run the main loop */
1926
2403
1927
2404
if(debug){
1928
fprintf(stderr, "Starting Avahi loop search\n");
2405
fprintf_plus(stderr, "Starting Avahi loop search\n");
1929
2406
}
1930
2407
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
(int)(retry_interval * 1000));
2408
ret = avahi_loop_with_timeout(simple_poll,
2409
(int)(retry_interval * 1000), &mc);
1933
2410
if(debug){
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
2411
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2412
(ret == 0) ? "successfully" : "with error");
1936
2413
}
1937
2414
1938
2415
end:
1939
2416
1940
2417
if(debug){
1941
fprintf(stderr, "%s exiting\n", argv[0]);
2418
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1942
2419
}
1943
2420
1944
2421
/* Cleanup things */
2422
free(mc.interfaces);
2423
1945
2424
if(sb != NULL)
1946
2425
avahi_s_service_browser_free(sb);
1947
2426
1948
2427
if(mc.server != NULL)
1949
2428
avahi_server_free(mc.server);
1950
2429
1951
if(mc.simple_poll != NULL)
1952
avahi_simple_poll_free(mc.simple_poll);
2430
if(simple_poll != NULL)
2431
avahi_simple_poll_free(simple_poll);
1953
2432
1954
2433
if(gnutls_initialized){
1955
2434
gnutls_certificate_free_credentials(mc.cred);
1960
2439
if(gpgme_initialized){
1961
2440
gpgme_release(mc.ctx);
1962
2441
}
1963
2442
1964
2443
/* Cleans up the circular linked list of Mandos servers the client
1965
2444
has seen */
1966
2445
if(mc.current_server != NULL){
1972
2451
}
1973
2452
}
1974
2453
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
1978
errno = 0;
1979
ret = seteuid(0);
1980
if(ret == -1){
1981
perror_plus("seteuid");
1982
}
1983
if(geteuid() == 0){
1984
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1985
if(ret == -1){
1986
perror_plus("ioctl SIOCGIFFLAGS");
1987
} else if(network.ifr_flags & IFF_UP) {
1988
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1989
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1990
if(ret == -1){
1991
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
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");
1992
2472
}
1993
2473
}
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
if(ret == -1){
1996
perror_plus("close");
1997
}
1998
/* Lower privileges permanently */
1999
errno = 0;
2000
ret = setuid(uid);
2001
if(ret == -1){
2002
perror_plus("setuid");
2474
if(debug and (interfaces_to_take_down == NULL)){
2475
fprintf_plus(stderr, "No interfaces needed to be taken"
2476
" down\n");
2003
2477
}
2004
2478
}
2479
2480
lower_privileges_permanently();
2005
2481
}
2006
2482
2483
free(interfaces_to_take_down);
2484
free(interfaces_hooks);
2485
2007
2486
/* Removes the GPGME temp directory and all files inside */
2008
2487
if(tempdir_created){
2009
2488
struct dirent **direntries = NULL;
2022
2501
}
2023
2502
ret = remove(fullname);
2024
2503
if(ret == -1){
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2026
strerror(errno));
2504
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2505
strerror(errno));
2027
2506
}
2028
2507
free(fullname);
2029
2508
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0