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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:
- DBUS-API
- debian/source
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
67
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
68
SIOCSIFFLAGS, if_indextoname(),
69
69
if_nametoindex(), IF_NAMESIZE */
72
72
*/
73
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
77
#include <iso646.h> /* not, or, and */
78
78
#include <argp.h> /* struct argp_option, error_t, struct
79
79
argp_state, struct argp,
84
84
raise() */
85
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
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() */
87
94
88
95
#ifdef __linux__
89
96
#include <sys/klog.h> /* klogctl() */
107
114
init_gnutls_session(),
108
115
GNUTLS_* */
109
116
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
112
119
113
120
/* GPGME */
114
121
#include <gpgme.h> /* All GPGME types, constants and
122
129
#define PATHDIR "/conf/conf.d/mandos"
123
130
#define SECKEY "seckey.txt"
124
131
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
125
133
126
134
bool debug = false;
127
135
static const char mandos_protocol_version[] = "1";
128
136
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
138
static const char sys_class_net[] = "/sys/class/net";
139
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
144
/* Doubly linked list that need to be circularly linked when used */
145
typedef struct server{
146
const char *ip;
147
in_port_t port;
148
AvahiIfIndex if_index;
149
int af;
150
struct timespec last_seen;
151
struct server *next;
152
struct server *prev;
153
} server;
130
154
131
155
/* Used for passing in values through the Avahi callback functions */
132
156
typedef struct {
133
AvahiSimplePoll *simple_poll;
134
157
AvahiServer *server;
135
158
gnutls_certificate_credentials_t cred;
136
159
unsigned int dh_bits;
137
160
gnutls_dh_params_t dh_params;
138
161
const char *priority;
139
162
gpgme_ctx_t ctx;
163
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
140
166
} mandos_context;
141
167
142
/* global context so signal handler can reach it*/
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
146
170
147
171
sig_atomic_t quit_now = 0;
148
172
int signal_received = 0;
149
173
174
/* Function to use when printing errors */
175
void perror_plus(const char *print_text){
176
int e = errno;
177
fprintf(stderr, "Mandos plugin %s: ",
178
program_invocation_short_name);
179
errno = e;
180
perror(print_text);
181
}
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
150
193
/*
151
194
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
195
* bytes. "buffer_capacity" is how much is currently allocated,
153
196
* "buffer_length" is how much is already used.
154
197
*/
155
198
size_t incbuffer(char **buffer, size_t buffer_length,
156
size_t buffer_capacity){
199
size_t buffer_capacity){
157
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
159
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;
160
207
return 0;
161
208
}
209
*buffer = new_buf;
162
210
buffer_capacity += BUFFER_SIZE;
163
211
}
164
212
return buffer_capacity;
165
213
}
166
214
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){
218
int ret;
219
server *new_server = malloc(sizeof(server));
220
if(new_server == NULL){
221
perror_plus("malloc");
222
return false;
223
}
224
*new_server = (server){ .ip = strdup(ip),
225
.port = port,
226
.if_index = if_index,
227
.af = af };
228
if(new_server->ip == NULL){
229
perror_plus("strdup");
230
return false;
231
}
232
/* Special case of first server */
233
if(*current_server == NULL){
234
new_server->next = new_server;
235
new_server->prev = new_server;
236
*current_server = new_server;
237
/* Place the new server last in the list */
238
} else {
239
new_server->next = *current_server;
240
new_server->prev = (*current_server)->prev;
241
new_server->prev->next = new_server;
242
(*current_server)->prev = new_server;
243
}
244
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
245
if(ret == -1){
246
perror_plus("clock_gettime");
247
return false;
248
}
249
return true;
250
}
251
167
252
/*
168
253
* Initialize GPGME.
169
254
*/
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
255
static bool init_gpgme(const char *seckey, const char *pubkey,
256
const char *tempdir, mandos_context *mc){
172
257
gpgme_error_t rc;
173
258
gpgme_engine_info_t engine_info;
174
259
175
176
260
/*
177
261
* Helper function to insert pub and seckey to the engine keyring.
178
262
*/
183
267
184
268
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
185
269
if(fd == -1){
186
perror("open");
270
perror_plus("open");
187
271
return false;
188
272
}
189
273
190
274
rc = gpgme_data_new_from_fd(&pgp_data, fd);
191
275
if(rc != GPG_ERR_NO_ERROR){
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
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));
194
278
return false;
195
279
}
196
280
197
rc = gpgme_op_import(mc.ctx, pgp_data);
281
rc = gpgme_op_import(mc->ctx, pgp_data);
198
282
if(rc != GPG_ERR_NO_ERROR){
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
283
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
201
285
return false;
202
286
}
203
287
204
288
ret = (int)TEMP_FAILURE_RETRY(close(fd));
205
289
if(ret == -1){
206
perror("close");
290
perror_plus("close");
207
291
}
208
292
gpgme_data_release(pgp_data);
209
293
return true;
210
294
}
211
295
212
296
if(debug){
213
fprintf(stderr, "Initializing GPGME\n");
297
fprintf_plus(stderr, "Initializing GPGME\n");
214
298
}
215
299
216
300
/* Init GPGME */
217
301
gpgme_check_version(NULL);
218
302
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
219
303
if(rc != GPG_ERR_NO_ERROR){
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
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));
222
306
return false;
223
307
}
224
308
225
/* Set GPGME home directory for the OpenPGP engine only */
309
/* Set GPGME home directory for the OpenPGP engine only */
226
310
rc = gpgme_get_engine_info(&engine_info);
227
311
if(rc != GPG_ERR_NO_ERROR){
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
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));
230
314
return false;
231
315
}
232
316
while(engine_info != NULL){
238
322
engine_info = engine_info->next;
239
323
}
240
324
if(engine_info == NULL){
241
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);
242
327
return false;
243
328
}
244
329
245
330
/* Create new GPGME "context" */
246
rc = gpgme_new(&(mc.ctx));
331
rc = gpgme_new(&(mc->ctx));
247
332
if(rc != GPG_ERR_NO_ERROR){
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
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));
250
336
return false;
251
337
}
252
338
263
349
*/
264
350
static ssize_t pgp_packet_decrypt(const char *cryptotext,
265
351
size_t crypto_size,
266
char **plaintext){
352
char **plaintext,
353
mandos_context *mc){
267
354
gpgme_data_t dh_crypto, dh_plain;
268
355
gpgme_error_t rc;
269
356
ssize_t ret;
271
358
ssize_t plaintext_length = 0;
272
359
273
360
if(debug){
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
361
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
275
362
}
276
363
277
364
/* Create new GPGME data buffer from memory cryptotext */
278
365
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
279
366
0);
280
367
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
282
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));
283
370
return -1;
284
371
}
285
372
286
373
/* Create new empty GPGME data buffer for the plaintext */
287
374
rc = gpgme_data_new(&dh_plain);
288
375
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
290
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));
291
379
gpgme_data_release(dh_crypto);
292
380
return -1;
293
381
}
294
382
295
383
/* Decrypt data from the cryptotext data buffer to the plaintext
296
384
data buffer */
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
385
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
298
386
if(rc != GPG_ERR_NO_ERROR){
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
387
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
301
389
plaintext_length = -1;
302
390
if(debug){
303
391
gpgme_decrypt_result_t result;
304
result = gpgme_op_decrypt_result(mc.ctx);
392
result = gpgme_op_decrypt_result(mc->ctx);
305
393
if(result == NULL){
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
394
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
307
395
} else {
308
fprintf(stderr, "Unsupported algorithm: %s\n",
309
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
311
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);
312
400
if(result->file_name != NULL){
313
fprintf(stderr, "File name: %s\n", result->file_name);
401
fprintf_plus(stderr, "File name: %s\n", result->file_name);
314
402
}
315
403
gpgme_recipient_t recipient;
316
404
recipient = result->recipients;
317
405
while(recipient != NULL){
318
fprintf(stderr, "Public key algorithm: %s\n",
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
322
recipient->status == GPG_ERR_NO_SECKEY
323
? "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");
324
413
recipient = recipient->next;
325
414
}
326
415
}
329
418
}
330
419
331
420
if(debug){
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
421
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
333
422
}
334
423
335
424
/* Seek back to the beginning of the GPGME plaintext data buffer */
336
425
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
337
perror("gpgme_data_seek");
426
perror_plus("gpgme_data_seek");
338
427
plaintext_length = -1;
339
428
goto decrypt_end;
340
429
}
342
431
*plaintext = NULL;
343
432
while(true){
344
433
plaintext_capacity = incbuffer(plaintext,
345
(size_t)plaintext_length,
346
plaintext_capacity);
434
(size_t)plaintext_length,
435
plaintext_capacity);
347
436
if(plaintext_capacity == 0){
348
perror("incbuffer");
349
plaintext_length = -1;
350
goto decrypt_end;
437
perror_plus("incbuffer");
438
plaintext_length = -1;
439
goto decrypt_end;
351
440
}
352
441
353
442
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
358
447
break;
359
448
}
360
449
if(ret < 0){
361
perror("gpgme_data_read");
450
perror_plus("gpgme_data_read");
362
451
plaintext_length = -1;
363
452
goto decrypt_end;
364
453
}
366
455
}
367
456
368
457
if(debug){
369
fprintf(stderr, "Decrypted password is: ");
458
fprintf_plus(stderr, "Decrypted password is: ");
370
459
for(ssize_t i = 0; i < plaintext_length; i++){
371
460
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
372
461
}
384
473
}
385
474
386
475
static const char * safer_gnutls_strerror(int value){
387
const char *ret = gnutls_strerror(value); /* Spurious warning from
388
-Wunreachable-code */
476
const char *ret = gnutls_strerror(value);
389
477
if(ret == NULL)
390
478
ret = "(unknown)";
391
479
return ret;
394
482
/* GnuTLS log function callback */
395
483
static void debuggnutls(__attribute__((unused)) int level,
396
484
const char* string){
397
fprintf(stderr, "GnuTLS: %s", string);
485
fprintf_plus(stderr, "GnuTLS: %s", string);
398
486
}
399
487
400
488
static int init_gnutls_global(const char *pubkeyfilename,
401
const char *seckeyfilename){
489
const char *seckeyfilename,
490
mandos_context *mc){
402
491
int ret;
403
492
404
493
if(debug){
405
fprintf(stderr, "Initializing GnuTLS\n");
494
fprintf_plus(stderr, "Initializing GnuTLS\n");
406
495
}
407
496
408
497
ret = gnutls_global_init();
409
498
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
499
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
500
safer_gnutls_strerror(ret));
412
501
return -1;
413
502
}
414
503
421
510
}
422
511
423
512
/* OpenPGP credentials */
424
gnutls_certificate_allocate_credentials(&mc.cred);
513
ret = gnutls_certificate_allocate_credentials(&mc->cred);
425
514
if(ret != GNUTLS_E_SUCCESS){
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
515
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
516
safer_gnutls_strerror(ret));
431
517
gnutls_global_deinit();
432
518
return -1;
433
519
}
434
520
435
521
if(debug){
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
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);
439
526
}
440
527
441
528
ret = gnutls_certificate_set_openpgp_key_file
442
(mc.cred, pubkeyfilename, seckeyfilename,
529
(mc->cred, pubkeyfilename, seckeyfilename,
443
530
GNUTLS_OPENPGP_FMT_BASE64);
444
531
if(ret != GNUTLS_E_SUCCESS){
445
fprintf(stderr,
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
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));
450
537
goto globalfail;
451
538
}
452
539
453
540
/* GnuTLS server initialization */
454
ret = gnutls_dh_params_init(&mc.dh_params);
541
ret = gnutls_dh_params_init(&mc->dh_params);
455
542
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
543
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
544
" initialization: %s\n",
545
safer_gnutls_strerror(ret));
458
546
goto globalfail;
459
547
}
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
548
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
461
549
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
550
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
551
safer_gnutls_strerror(ret));
464
552
goto globalfail;
465
553
}
466
554
467
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
555
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
468
556
469
557
return 0;
470
558
471
559
globalfail:
472
560
473
gnutls_certificate_free_credentials(mc.cred);
561
gnutls_certificate_free_credentials(mc->cred);
474
562
gnutls_global_deinit();
475
gnutls_dh_params_deinit(mc.dh_params);
563
gnutls_dh_params_deinit(mc->dh_params);
476
564
return -1;
477
565
}
478
566
479
static int init_gnutls_session(gnutls_session_t *session){
567
static int init_gnutls_session(gnutls_session_t *session,
568
mandos_context *mc){
480
569
int ret;
481
570
/* GnuTLS session creation */
482
571
do {
486
575
}
487
576
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
577
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
safer_gnutls_strerror(ret));
578
fprintf_plus(stderr,
579
"Error in GnuTLS session initialization: %s\n",
580
safer_gnutls_strerror(ret));
491
581
}
492
582
493
583
{
494
584
const char *err;
495
585
do {
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
586
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
497
587
if(quit_now){
498
588
gnutls_deinit(*session);
499
589
return -1;
500
590
}
501
591
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
502
592
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Syntax error at: %s\n", err);
504
fprintf(stderr, "GnuTLS error: %s\n",
505
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));
506
596
gnutls_deinit(*session);
507
597
return -1;
508
598
}
510
600
511
601
do {
512
602
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
513
mc.cred);
603
mc->cred);
514
604
if(quit_now){
515
605
gnutls_deinit(*session);
516
606
return -1;
517
607
}
518
608
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
519
609
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
safer_gnutls_strerror(ret));
610
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
611
safer_gnutls_strerror(ret));
522
612
gnutls_deinit(*session);
523
613
return -1;
524
614
}
526
616
/* ignore client certificate if any. */
527
617
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
528
618
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
619
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
530
620
531
621
return 0;
532
622
}
536
626
__attribute__((unused)) const char *txt){}
537
627
538
628
/* Called when a Mandos server is found */
539
static int start_mandos_communication(const char *ip, uint16_t port,
629
static int start_mandos_communication(const char *ip, in_port_t port,
540
630
AvahiIfIndex if_index,
541
int af){
631
int af, mandos_context *mc){
542
632
int ret, tcp_sd = -1;
543
633
ssize_t sret;
544
634
union {
569
659
pf = PF_INET;
570
660
break;
571
661
default:
572
fprintf(stderr, "Bad address family: %d\n", af);
662
fprintf_plus(stderr, "Bad address family: %d\n", af);
573
663
errno = EINVAL;
574
664
return -1;
575
665
}
576
666
577
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);
578
700
if(ret != 0){
579
701
return -1;
580
702
}
581
703
582
704
if(debug){
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
584
"\n", ip, port);
705
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
706
PRIuMAX "\n", ip, (uintmax_t)port);
585
707
}
586
708
587
709
tcp_sd = socket(pf, SOCK_STREAM, 0);
588
710
if(tcp_sd < 0){
589
711
int e = errno;
590
perror("socket");
712
perror_plus("socket");
591
713
errno = e;
592
714
goto mandos_end;
593
715
}
607
729
}
608
730
if(ret < 0 ){
609
731
int e = errno;
610
perror("inet_pton");
732
perror_plus("inet_pton");
611
733
errno = e;
612
734
goto mandos_end;
613
735
}
614
736
if(ret == 0){
615
737
int e = errno;
616
fprintf(stderr, "Bad address: %s\n", ip);
738
fprintf_plus(stderr, "Bad address: %s\n", ip);
617
739
errno = e;
618
740
goto mandos_end;
619
741
}
620
742
if(af == AF_INET6){
621
to.in6.sin6_port = htons(port); /* Spurious warnings from
622
-Wconversion and
623
-Wunreachable-code */
624
743
to.in6.sin6_port = htons(port);
744
#ifdef __GNUC__
745
#pragma GCC diagnostic push
746
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
747
#endif
625
748
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
626
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
627
-Wunreachable-code*/
749
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
750
#ifdef __GNUC__
751
#pragma GCC diagnostic pop
752
#endif
628
753
if(if_index == AVAHI_IF_UNSPEC){
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
630
" without a network interface\n");
754
fprintf_plus(stderr, "An IPv6 link-local address is"
755
" incomplete without a network interface\n");
631
756
errno = EINVAL;
632
757
goto mandos_end;
633
758
}
635
760
to.in6.sin6_scope_id = (uint32_t)if_index;
636
761
}
637
762
} else {
638
to.in.sin_port = htons(port); /* Spurious warnings from
639
-Wconversion and
640
-Wunreachable-code */
763
to.in.sin_port = htons(port);
641
764
}
642
765
643
766
if(quit_now){
649
772
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
650
773
char interface[IF_NAMESIZE];
651
774
if(if_indextoname((unsigned int)if_index, interface) == NULL){
652
perror("if_indextoname");
775
perror_plus("if_indextoname");
653
776
} else {
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
655
ip, interface, port);
777
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
778
"\n", ip, interface, (uintmax_t)port);
656
779
}
657
780
} else {
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
781
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
782
ip, (uintmax_t)port);
660
783
}
661
784
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
662
785
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
669
792
sizeof(addrstr));
670
793
}
671
794
if(pcret == NULL){
672
perror("inet_ntop");
795
perror_plus("inet_ntop");
673
796
} else {
674
797
if(strcmp(addrstr, ip) != 0){
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
798
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
676
799
}
677
800
}
678
801
}
688
811
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
689
812
}
690
813
if(ret < 0){
691
int e = errno;
692
perror("connect");
693
errno = e;
814
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
815
int e = errno;
816
perror_plus("connect");
817
errno = e;
818
}
694
819
goto mandos_end;
695
820
}
696
821
704
829
while(true){
705
830
size_t out_size = strlen(out);
706
831
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
707
out_size - written));
832
out_size - written));
708
833
if(ret == -1){
709
834
int e = errno;
710
perror("write");
835
perror_plus("write");
711
836
errno = e;
712
837
goto mandos_end;
713
838
}
730
855
}
731
856
732
857
if(debug){
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
858
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
734
859
}
735
860
736
861
if(quit_now){
738
863
goto mandos_end;
739
864
}
740
865
741
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);
742
871
743
872
if(quit_now){
744
873
errno = EINTR;
755
884
756
885
if(ret != GNUTLS_E_SUCCESS){
757
886
if(debug){
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
887
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
759
888
gnutls_perror(ret);
760
889
}
761
890
errno = EPROTO;
765
894
/* Read OpenPGP packet that contains the wanted password */
766
895
767
896
if(debug){
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
769
ip);
897
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
898
" %s\n", ip);
770
899
}
771
900
772
901
while(true){
777
906
}
778
907
779
908
buffer_capacity = incbuffer(&buffer, buffer_length,
780
buffer_capacity);
909
buffer_capacity);
781
910
if(buffer_capacity == 0){
782
911
int e = errno;
783
perror("incbuffer");
912
perror_plus("incbuffer");
784
913
errno = e;
785
914
goto mandos_end;
786
915
}
810
939
}
811
940
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
941
if(ret < 0){
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
942
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
943
"***\n");
814
944
gnutls_perror(ret);
815
945
errno = EPROTO;
816
946
goto mandos_end;
817
947
}
818
948
break;
819
949
default:
820
fprintf(stderr, "Unknown error while reading data from"
821
" encrypted session with Mandos server\n");
950
fprintf_plus(stderr, "Unknown error while reading data from"
951
" encrypted session with Mandos server\n");
822
952
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
953
errno = EIO;
824
954
goto mandos_end;
829
959
}
830
960
831
961
if(debug){
832
fprintf(stderr, "Closing TLS session\n");
962
fprintf_plus(stderr, "Closing TLS session\n");
833
963
}
834
964
835
965
if(quit_now){
847
977
848
978
if(buffer_length > 0){
849
979
ssize_t decrypted_buffer_size;
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
851
buffer_length,
852
&decrypted_buffer);
980
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
981
&decrypted_buffer, mc);
853
982
if(decrypted_buffer_size >= 0){
854
983
855
984
written = 0;
865
994
if(ret == 0 and ferror(stdout)){
866
995
int e = errno;
867
996
if(debug){
868
fprintf(stderr, "Error writing encrypted data: %s\n",
869
strerror(errno));
997
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
998
strerror(errno));
870
999
}
871
1000
errno = e;
872
1001
goto mandos_end;
891
1020
if(e == 0){
892
1021
e = errno;
893
1022
}
894
perror("close");
1023
perror_plus("close");
895
1024
}
896
1025
gnutls_deinit(session);
1026
errno = e;
897
1027
if(quit_now){
898
e = EINTR;
1028
errno = EINTR;
899
1029
retval = -1;
900
1030
}
901
errno = e;
902
1031
}
903
1032
return retval;
904
1033
}
916
1045
AVAHI_GCC_UNUSED AvahiStringList *txt,
917
1046
AVAHI_GCC_UNUSED AvahiLookupResultFlags
918
1047
flags,
919
AVAHI_GCC_UNUSED void* userdata){
920
assert(r);
1048
void* mc){
1049
if(r == NULL){
1050
return;
1051
}
921
1052
922
1053
/* Called whenever a service has been resolved successfully or
923
1054
timed out */
929
1060
switch(event){
930
1061
default:
931
1062
case AVAHI_RESOLVER_FAILURE:
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
934
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)));
935
1068
break;
936
1069
937
1070
case AVAHI_RESOLVER_FOUND:
939
1072
char ip[AVAHI_ADDRESS_STR_MAX];
940
1073
avahi_address_snprint(ip, sizeof(ip), address);
941
1074
if(debug){
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
944
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);
945
1078
}
946
int ret = start_mandos_communication(ip, port, interface,
947
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);
948
1083
if(ret == 0){
949
avahi_simple_poll_quit(mc.simple_poll);
1084
avahi_simple_poll_quit(simple_poll);
1085
} 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
}
950
1092
}
951
1093
}
952
1094
}
962
1104
const char *domain,
963
1105
AVAHI_GCC_UNUSED AvahiLookupResultFlags
964
1106
flags,
965
AVAHI_GCC_UNUSED void* userdata){
966
assert(b);
1107
void* mc){
1108
if(b == NULL){
1109
return;
1110
}
967
1111
968
1112
/* Called whenever a new services becomes available on the LAN or
969
1113
is removed from the LAN */
976
1120
default:
977
1121
case AVAHI_BROWSER_FAILURE:
978
1122
979
fprintf(stderr, "(Avahi browser) %s\n",
980
avahi_strerror(avahi_server_errno(mc.server)));
981
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);
982
1127
return;
983
1128
984
1129
case AVAHI_BROWSER_NEW:
987
1132
the callback function is called the Avahi server will free the
988
1133
resolver for us. */
989
1134
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
name, type, domain, protocol, 0,
992
resolve_callback, NULL) == NULL)
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
994
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)));
995
1143
break;
996
1144
997
1145
case AVAHI_BROWSER_REMOVE:
1000
1148
case AVAHI_BROWSER_ALL_FOR_NOW:
1001
1149
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1002
1150
if(debug){
1003
fprintf(stderr, "No Mandos server found, still searching...\n");
1151
fprintf_plus(stderr, "No Mandos server found, still"
1152
" searching...\n");
1004
1153
}
1005
1154
break;
1006
1155
}
1007
1156
}
1008
1157
1009
/* stop main loop after sigterm has been called */
1158
/* Signal handler that stops main loop after SIGTERM */
1010
1159
static void handle_sigterm(int sig){
1011
1160
if(quit_now){
1012
1161
return;
1014
1163
quit_now = 1;
1015
1164
signal_received = sig;
1016
1165
int old_errno = errno;
1017
if(mc.simple_poll != NULL){
1018
avahi_simple_poll_quit(mc.simple_poll);
1019
}
1020
errno = old_errno;
1166
/* set main loop to exit */
1167
if(simple_poll != NULL){
1168
avahi_simple_poll_quit(simple_poll);
1169
}
1170
errno = old_errno;
1171
}
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
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;
1260
}
1261
return 1;
1262
}
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
1296
int notdotentries(const struct dirent *direntry){
1297
/* Skip "." and ".." */
1298
if(direntry->d_name[0] == '.'
1299
and (direntry->d_name[1] == '\0'
1300
or (direntry->d_name[1] == '.'
1301
and direntry->d_name[2] == '\0'))){
1302
return 0;
1303
}
1304
return 1;
1305
}
1306
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){
1370
int ret;
1371
struct timespec now;
1372
struct timespec waited_time;
1373
intmax_t block_time;
1374
1375
while(true){
1376
if(mc->current_server == NULL){
1377
if (debug){
1378
fprintf_plus(stderr, "Wait until first server is found."
1379
" No timeout!\n");
1380
}
1381
ret = avahi_simple_poll_iterate(s, -1);
1382
} else {
1383
if (debug){
1384
fprintf_plus(stderr, "Check current_server if we should run"
1385
" it, or wait\n");
1386
}
1387
/* the current time */
1388
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1389
if(ret == -1){
1390
perror_plus("clock_gettime");
1391
return -1;
1392
}
1393
/* Calculating in ms how long time between now and server
1394
who we visted longest time ago. Now - last seen. */
1395
waited_time.tv_sec = (now.tv_sec
1396
- mc->current_server->last_seen.tv_sec);
1397
waited_time.tv_nsec = (now.tv_nsec
1398
- mc->current_server->last_seen.tv_nsec);
1399
/* total time is 10s/10,000ms.
1400
Converting to s from ms by dividing by 1,000,
1401
and ns to ms by dividing by 1,000,000. */
1402
block_time = ((retry_interval
1403
- ((intmax_t)waited_time.tv_sec * 1000))
1404
- ((intmax_t)waited_time.tv_nsec / 1000000));
1405
1406
if (debug){
1407
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1408
block_time);
1409
}
1410
1411
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);
1416
if(ret == 0){
1417
avahi_simple_poll_quit(s);
1418
return 0;
1419
}
1420
ret = clock_gettime(CLOCK_MONOTONIC,
1421
&mc->current_server->last_seen);
1422
if(ret == -1){
1423
perror_plus("clock_gettime");
1424
return -1;
1425
}
1426
mc->current_server = mc->current_server->next;
1427
block_time = 0; /* Call avahi to find new Mandos
1428
servers, but don't block */
1429
}
1430
1431
ret = avahi_simple_poll_iterate(s, (int)block_time);
1432
}
1433
if(ret != 0){
1434
if (ret > 0 or errno != EINTR){
1435
return (ret != 1) ? ret : 0;
1436
}
1437
}
1438
}
1439
}
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;
1021
1794
}
1022
1795
1023
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 };
1024
1801
AvahiSServiceBrowser *sb = NULL;
1025
int error;
1802
error_t ret_errno;
1026
1803
int ret;
1027
1804
intmax_t tmpmax;
1028
1805
char *tmp;
1029
1806
int exitcode = EXIT_SUCCESS;
1030
const char *interface = "eth0";
1031
struct ifreq network;
1032
int sd = -1;
1033
bool take_down_interface = false;
1034
uid_t uid;
1035
gid_t gid;
1036
char *connect_to = NULL;
1807
char *interfaces_to_take_down = NULL;
1808
size_t interfaces_to_take_down_size = 0;
1037
1809
char tempdir[] = "/tmp/mandosXXXXXX";
1038
1810
bool tempdir_created = false;
1039
1811
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1040
1812
const char *seckey = PATHDIR "/" SECKEY;
1041
1813
const char *pubkey = PATHDIR "/" PUBKEY;
1814
char *interfaces_hooks = NULL;
1042
1815
1043
1816
bool gnutls_initialized = false;
1044
1817
bool gpgme_initialized = false;
1045
1818
float delay = 2.5f;
1819
double retry_interval = 10; /* 10s between trying a server and
1820
retrying the same server again */
1046
1821
1047
1822
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1048
1823
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1054
1829
errno = 0;
1055
1830
ret = setgid(gid);
1056
1831
if(ret == -1){
1057
perror("setgid");
1832
perror_plus("setgid");
1058
1833
}
1059
1834
1060
1835
/* Lower user privileges (temporarily) */
1061
1836
errno = 0;
1062
1837
ret = seteuid(uid);
1063
1838
if(ret == -1){
1064
perror("seteuid");
1839
perror_plus("seteuid");
1065
1840
}
1066
1841
1067
1842
if(quit_now){
1102
1877
.arg = "SECONDS",
1103
1878
.doc = "Maximum delay to wait for interface startup",
1104
1879
.group = 2 },
1880
{ .name = "retry", .key = 132,
1881
.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",
1887
.group = 2 },
1105
1888
/*
1106
1889
* These reproduce what we would get without ARGP_NO_HELP
1107
1890
*/
1125
1908
connect_to = arg;
1126
1909
break;
1127
1910
case 'i': /* --interface */
1128
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
}
1129
1916
break;
1130
1917
case 's': /* --seckey */
1131
1918
seckey = arg;
1151
1938
if(errno != 0 or tmp == arg or *tmp != '\0'){
1152
1939
argp_error(state, "Bad delay");
1153
1940
}
1941
case 132: /* --retry */
1942
errno = 0;
1943
retry_interval = strtod(arg, &tmp);
1944
if(errno != 0 or tmp == arg or *tmp != '\0'
1945
or (retry_interval * 1000) > INT_MAX
1946
or retry_interval < 0){
1947
argp_error(state, "Bad retry interval");
1948
}
1949
break;
1950
case 133: /* --network-hook-dir */
1951
hookdir = arg;
1154
1952
break;
1155
1953
/*
1156
1954
* These reproduce what we would get without ARGP_NO_HELP
1163
1961
argp_state_help(state, state->out_stream,
1164
1962
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1165
1963
case 'V': /* --version */
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1964
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1167
1965
exit(argp_err_exit_status);
1168
1966
break;
1169
1967
default:
1184
1982
case ENOMEM:
1185
1983
default:
1186
1984
errno = ret;
1187
perror("argp_parse");
1985
perror_plus("argp_parse");
1188
1986
exitcode = EX_OSERR;
1189
1987
goto end;
1190
1988
case EINVAL:
1192
1990
goto end;
1193
1991
}
1194
1992
}
1993
1994
{
1995
/* Work around Debian bug #633582:
1996
<http://bugs.debian.org/633582> */
1997
1998
/* 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;
2080
}
2081
}
1195
2082
1196
2083
if(not debug){
1197
2084
avahi_set_log_function(empty_log);
1201
2088
from the signal handler */
1202
2089
/* Initialize the pseudo-RNG for Avahi */
1203
2090
srand((unsigned int) time(NULL));
1204
mc.simple_poll = avahi_simple_poll_new();
1205
if(mc.simple_poll == NULL){
1206
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");
1207
2095
exitcode = EX_UNAVAILABLE;
1208
2096
goto end;
1209
2097
}
1211
2099
sigemptyset(&sigterm_action.sa_mask);
1212
2100
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1213
2101
if(ret == -1){
1214
perror("sigaddset");
2102
perror_plus("sigaddset");
1215
2103
exitcode = EX_OSERR;
1216
2104
goto end;
1217
2105
}
1218
2106
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1219
2107
if(ret == -1){
1220
perror("sigaddset");
2108
perror_plus("sigaddset");
1221
2109
exitcode = EX_OSERR;
1222
2110
goto end;
1223
2111
}
1224
2112
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1225
2113
if(ret == -1){
1226
perror("sigaddset");
2114
perror_plus("sigaddset");
1227
2115
exitcode = EX_OSERR;
1228
2116
goto end;
1229
2117
}
1233
2121
*/
1234
2122
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1235
2123
if(ret == -1){
1236
perror("sigaction");
2124
perror_plus("sigaction");
1237
2125
return EX_OSERR;
1238
2126
}
1239
2127
if(old_sigterm_action.sa_handler != SIG_IGN){
1240
2128
ret = sigaction(SIGINT, &sigterm_action, NULL);
1241
2129
if(ret == -1){
1242
perror("sigaction");
2130
perror_plus("sigaction");
1243
2131
exitcode = EX_OSERR;
1244
2132
goto end;
1245
2133
}
1246
2134
}
1247
2135
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1248
2136
if(ret == -1){
1249
perror("sigaction");
2137
perror_plus("sigaction");
1250
2138
return EX_OSERR;
1251
2139
}
1252
2140
if(old_sigterm_action.sa_handler != SIG_IGN){
1253
2141
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1254
2142
if(ret == -1){
1255
perror("sigaction");
2143
perror_plus("sigaction");
1256
2144
exitcode = EX_OSERR;
1257
2145
goto end;
1258
2146
}
1259
2147
}
1260
2148
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1261
2149
if(ret == -1){
1262
perror("sigaction");
2150
perror_plus("sigaction");
1263
2151
return EX_OSERR;
1264
2152
}
1265
2153
if(old_sigterm_action.sa_handler != SIG_IGN){
1266
2154
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1267
2155
if(ret == -1){
1268
perror("sigaction");
1269
exitcode = EX_OSERR;
1270
goto end;
1271
}
1272
}
1273
1274
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1279
exitcode = EX_UNAVAILABLE;
1280
goto end;
1281
}
1282
1283
if(quit_now){
1284
goto end;
1285
}
1286
1287
/* Re-raise priviliges */
1288
errno = 0;
1289
ret = seteuid(0);
1290
if(ret == -1){
1291
perror("seteuid");
1292
}
1293
1294
#ifdef __linux__
1295
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1296
messages about the network interface to mess up the prompt */
1297
ret = klogctl(8, NULL, 5);
1298
bool restore_loglevel = true;
1299
if(ret == -1){
1300
restore_loglevel = false;
1301
perror("klogctl");
1302
}
1303
#endif /* __linux__ */
1304
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1306
if(sd < 0){
1307
perror("socket");
1308
exitcode = EX_OSERR;
1309
#ifdef __linux__
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1312
if(ret == -1){
1313
perror("klogctl");
1314
}
1315
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1323
goto end;
1324
}
1325
strcpy(network.ifr_name, interface);
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1327
if(ret == -1){
1328
perror("ioctl SIOCGIFFLAGS");
1329
#ifdef __linux__
1330
if(restore_loglevel){
1331
ret = klogctl(7, NULL, 0);
1332
if(ret == -1){
1333
perror("klogctl");
1334
}
1335
}
1336
#endif /* __linux__ */
1337
exitcode = EX_OSERR;
1338
/* Lower privileges */
1339
errno = 0;
1340
ret = seteuid(uid);
1341
if(ret == -1){
1342
perror("seteuid");
1343
}
1344
goto end;
1345
}
1346
if((network.ifr_flags & IFF_UP) == 0){
1347
network.ifr_flags |= IFF_UP;
1348
take_down_interface = true;
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
if(ret == -1){
1351
take_down_interface = false;
1352
perror("ioctl SIOCSIFFLAGS");
1353
exitcode = EX_OSERR;
1354
#ifdef __linux__
1355
if(restore_loglevel){
1356
ret = klogctl(7, NULL, 0);
1357
if(ret == -1){
1358
perror("klogctl");
2156
perror_plus("sigaction");
2157
exitcode = EX_OSERR;
2158
goto end;
2159
}
2160
}
2161
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;
1359
2209
}
1360
2210
}
1361
#endif /* __linux__ */
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1368
goto end;
1369
}
1370
}
1371
/* sleep checking until interface is running */
1372
for(int i=0; i < delay * 4; i++){
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1374
if(ret == -1){
1375
perror("ioctl SIOCGIFFLAGS");
1376
} else if(network.ifr_flags & IFF_RUNNING){
1377
2211
break;
1378
2212
}
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1380
ret = nanosleep(&sleeptime, NULL);
1381
if(ret == -1 and errno != EINTR){
1382
perror("nanosleep");
1383
}
1384
}
1385
if(not take_down_interface){
1386
/* We won't need the socket anymore */
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1388
if(ret == -1){
1389
perror("close");
1390
}
1391
}
1392
#ifdef __linux__
1393
if(restore_loglevel){
1394
/* Restores kernel loglevel to default */
1395
ret = klogctl(7, NULL, 0);
1396
if(ret == -1){
1397
perror("klogctl");
1398
}
1399
}
1400
#endif /* __linux__ */
1401
/* Lower privileges */
1402
errno = 0;
1403
if(take_down_interface){
1404
/* Lower privileges */
1405
ret = seteuid(uid);
1406
if(ret == -1){
1407
perror("seteuid");
1408
}
1409
} else {
1410
/* Lower privileges permanently */
1411
ret = setuid(uid);
1412
if(ret == -1){
1413
perror("setuid");
1414
}
1415
}
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);
1416
2242
}
1417
2243
1418
2244
if(quit_now){
1419
2245
goto end;
1420
2246
}
1421
2247
1422
ret = init_gnutls_global(pubkey, seckey);
2248
ret = init_gnutls_global(pubkey, seckey, &mc);
1423
2249
if(ret == -1){
1424
fprintf(stderr, "init_gnutls_global failed\n");
2250
fprintf_plus(stderr, "init_gnutls_global failed\n");
1425
2251
exitcode = EX_UNAVAILABLE;
1426
2252
goto end;
1427
2253
} else {
1432
2258
goto end;
1433
2259
}
1434
2260
2261
if(mkdtemp(tempdir) == NULL){
2262
perror_plus("mkdtemp");
2263
goto end;
2264
}
1435
2265
tempdir_created = true;
1436
if(mkdtemp(tempdir) == NULL){
1437
tempdir_created = false;
1438
perror("mkdtemp");
1439
goto end;
1440
}
1441
2266
1442
2267
if(quit_now){
1443
2268
goto end;
1444
2269
}
1445
2270
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
1447
fprintf(stderr, "init_gpgme failed\n");
2271
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2272
fprintf_plus(stderr, "init_gpgme failed\n");
1448
2273
exitcode = EX_UNAVAILABLE;
1449
2274
goto end;
1450
2275
} else {
1459
2284
/* Connect directly, do not use Zeroconf */
1460
2285
/* (Mainly meant for debugging) */
1461
2286
char *address = strrchr(connect_to, ':');
2287
1462
2288
if(address == NULL){
1463
fprintf(stderr, "No colon in address\n");
2289
fprintf_plus(stderr, "No colon in address\n");
1464
2290
exitcode = EX_USAGE;
1465
2291
goto end;
1466
2292
}
1469
2295
goto end;
1470
2296
}
1471
2297
1472
uint16_t port;
2298
in_port_t port;
1473
2299
errno = 0;
1474
2300
tmpmax = strtoimax(address+1, &tmp, 10);
1475
2301
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1476
or tmpmax != (uint16_t)tmpmax){
1477
fprintf(stderr, "Bad port number\n");
2302
or tmpmax != (in_port_t)tmpmax){
2303
fprintf_plus(stderr, "Bad port number\n");
1478
2304
exitcode = EX_USAGE;
1479
2305
goto end;
1480
2306
}
1481
2307
1482
2308
if(quit_now){
1483
2309
goto end;
1484
2310
}
1485
2311
1486
port = (uint16_t)tmpmax;
2312
port = (in_port_t)tmpmax;
1487
2313
*address = '\0';
1488
address = connect_to;
1489
2314
/* Colon in address indicates IPv6 */
1490
2315
int af;
1491
if(strchr(address, ':') != NULL){
2316
if(strchr(connect_to, ':') != NULL){
1492
2317
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
}
1493
2324
} else {
1494
2325
af = AF_INET;
1495
2326
}
2327
address = connect_to;
1496
2328
1497
2329
if(quit_now){
1498
2330
goto end;
1499
2331
}
1500
2332
1501
ret = start_mandos_communication(address, port, if_index, af);
1502
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1522
} else {
2333
while(not quit_now){
2334
ret = start_mandos_communication(address, port, if_index, af,
2335
&mc);
2336
if(quit_now or ret == 0){
2337
break;
2338
}
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
2346
if (not quit_now){
1523
2347
exitcode = EXIT_SUCCESS;
1524
2348
}
2349
1525
2350
goto end;
1526
2351
}
1527
2352
1539
2364
config.publish_domain = 0;
1540
2365
1541
2366
/* Allocate a new server */
1542
mc.server = avahi_server_new(avahi_simple_poll_get
1543
(mc.simple_poll), &config, NULL,
1544
NULL, &error);
2367
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2368
&config, NULL, NULL, &ret_errno);
1545
2369
1546
2370
/* Free the Avahi configuration data */
1547
2371
avahi_server_config_free(&config);
1549
2373
1550
2374
/* Check if creating the Avahi server object succeeded */
1551
2375
if(mc.server == NULL){
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
1553
avahi_strerror(error));
2376
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2377
avahi_strerror(ret_errno));
1554
2378
exitcode = EX_UNAVAILABLE;
1555
2379
goto end;
1556
2380
}
1562
2386
/* Create the Avahi service browser */
1563
2387
sb = avahi_s_service_browser_new(mc.server, if_index,
1564
2388
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1565
NULL, 0, browse_callback, NULL);
2389
NULL, 0, browse_callback,
2390
(void *)&mc);
1566
2391
if(sb == NULL){
1567
fprintf(stderr, "Failed to create service browser: %s\n",
1568
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)));
1569
2394
exitcode = EX_UNAVAILABLE;
1570
2395
goto end;
1571
2396
}
1577
2402
/* Run the main loop */
1578
2403
1579
2404
if(debug){
1580
fprintf(stderr, "Starting Avahi loop search\n");
1581
}
1582
1583
avahi_simple_poll_loop(mc.simple_poll);
2405
fprintf_plus(stderr, "Starting Avahi loop search\n");
2406
}
2407
2408
ret = avahi_loop_with_timeout(simple_poll,
2409
(int)(retry_interval * 1000), &mc);
2410
if(debug){
2411
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2412
(ret == 0) ? "successfully" : "with error");
2413
}
1584
2414
1585
2415
end:
1586
2416
1587
2417
if(debug){
1588
fprintf(stderr, "%s exiting\n", argv[0]);
2418
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1589
2419
}
1590
2420
1591
2421
/* Cleanup things */
2422
free(mc.interfaces);
2423
1592
2424
if(sb != NULL)
1593
2425
avahi_s_service_browser_free(sb);
1594
2426
1595
2427
if(mc.server != NULL)
1596
2428
avahi_server_free(mc.server);
1597
2429
1598
if(mc.simple_poll != NULL)
1599
avahi_simple_poll_free(mc.simple_poll);
2430
if(simple_poll != NULL)
2431
avahi_simple_poll_free(simple_poll);
1600
2432
1601
2433
if(gnutls_initialized){
1602
2434
gnutls_certificate_free_credentials(mc.cred);
1608
2440
gpgme_release(mc.ctx);
1609
2441
}
1610
2442
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
1614
errno = 0;
1615
ret = seteuid(0);
1616
if(ret == -1){
1617
perror("seteuid");
2443
/* Cleans up the circular linked list of Mandos servers the client
2444
has seen */
2445
if(mc.current_server != NULL){
2446
mc.current_server->prev->next = NULL;
2447
while(mc.current_server != NULL){
2448
server *next = mc.current_server->next;
2449
free(mc.current_server);
2450
mc.current_server = next;
1618
2451
}
1619
if(geteuid() == 0){
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
2452
}
2453
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");
1628
2472
}
1629
2473
}
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
if(ret == -1){
1632
perror("close");
1633
}
1634
/* Lower privileges permanently */
1635
errno = 0;
1636
ret = setuid(uid);
1637
if(ret == -1){
1638
perror("setuid");
2474
if(debug and (interfaces_to_take_down == NULL)){
2475
fprintf_plus(stderr, "No interfaces needed to be taken"
2476
" down\n");
1639
2477
}
1640
2478
}
2479
2480
lower_privileges_permanently();
1641
2481
}
1642
2482
1643
/* Removes the temp directory used by GPGME */
2483
free(interfaces_to_take_down);
2484
free(interfaces_hooks);
2485
2486
/* Removes the GPGME temp directory and all files inside */
1644
2487
if(tempdir_created){
1645
DIR *d;
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1648
if(d == NULL){
1649
if(errno != ENOENT){
1650
perror("opendir");
1651
}
1652
} else {
1653
while(true){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1656
break;
1657
}
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
1663
continue;
1664
}
2488
struct dirent **direntries = NULL;
2489
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++){
2494
direntry = direntries[i];
1665
2495
char *fullname = NULL;
1666
2496
ret = asprintf(&fullname, "%s/%s", tempdir,
1667
2497
direntry->d_name);
1668
2498
if(ret < 0){
1669
perror("asprintf");
2499
perror_plus("asprintf");
1670
2500
continue;
1671
2501
}
1672
2502
ret = remove(fullname);
1673
2503
if(ret == -1){
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
2504
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2505
strerror(errno));
1676
2506
}
1677
2507
free(fullname);
1678
2508
}
1679
closedir(d);
2509
}
2510
2511
/* need to clean even if 0 because man page doesn't specify */
2512
free(direntries);
2513
if (numentries == -1){
2514
perror_plus("scandir");
1680
2515
}
1681
2516
ret = rmdir(tempdir);
1682
2517
if(ret == -1 and errno != ENOENT){
1683
perror("rmdir");
2518
perror_plus("rmdir");
1684
2519
}
1685
2520
}
1686
2521
1691
2526
&old_sigterm_action,
1692
2527
NULL));
1693
2528
if(ret == -1){
1694
perror("sigaction");
2529
perror_plus("sigaction");
1695
2530
}
1696
2531
do {
1697
2532
ret = raise(signal_received);
1698
2533
} while(ret != 0 and errno == EINTR);
1699
2534
if(ret != 0){
1700
perror("raise");
2535
perror_plus("raise");
1701
2536
abort();
1702
2537
}
1703
2538
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0