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- Committer: Teddy Hogeborn
- Date: 2011-08-08 21:12:37 UTC
- Revision ID: teddy@fukt.bsnet.se-20110808211237-jejsz5brjytrjot8
* Makefile (DOCS): Added "intro.8mandos".
(intro.8mandos, intro.8mandos.xhtml): New.
* README: Replaced text with link, reference and short summary.
* intro.xml: New.
* mandos-clients.conf.xml (SEE ALSO): Added "intro(8mandos)".
* mandos-ctl.xml (SEE ALSO): - '' -
* mandos-keygen.xml (SEE ALSO): - '' -
* mandos-monitor.xml (SEE ALSO): - '' -
* mandos.conf.xml (SEE ALSO): - '' -
* mandos.xml (SEE ALSO): - '' -
* plugin-runner.xml (SEE ALSO): - '' -
* plugins.d/askpass-fifo.xml (SEE ALSO): - '' -
* plugins.d/mandos-client.xml (SEE ALSO): - '' -
* plugins.d/password-prompt.xml (SEE ALSO): - '' -
* plugins.d/plymouth.xml (SEE ALSO): - '' -
* plugins.d/splashy.xml (SEE ALSO): - '' -
* plugins.d/usplash.xml (SEE ALSO): - '' -
(intro.8mandos, intro.8mandos.xhtml): New.
* README: Replaced text with link, reference and short summary.
* intro.xml: New.
* mandos-clients.conf.xml (SEE ALSO): Added "intro(8mandos)".
* mandos-ctl.xml (SEE ALSO): - '' -
* mandos-keygen.xml (SEE ALSO): - '' -
* mandos-monitor.xml (SEE ALSO): - '' -
* mandos.conf.xml (SEE ALSO): - '' -
* mandos.xml (SEE ALSO): - '' -
* plugin-runner.xml (SEE ALSO): - '' -
* plugins.d/askpass-fifo.xml (SEE ALSO): - '' -
* plugins.d/mandos-client.xml (SEE ALSO): - '' -
* plugins.d/password-prompt.xml (SEE ALSO): - '' -
* plugins.d/plymouth.xml (SEE ALSO): - '' -
* plugins.d/splashy.xml (SEE ALSO): - '' -
* plugins.d/usplash.xml (SEE ALSO): - '' -
- files removed:
- debian/mandos-client.examples
- debian/upstream
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
58
inet_pton(), connect() */
60
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
80
80
argp_state, struct argp,
85
85
raise() */
86
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
97
88
98
89
#ifdef __linux__
99
90
#include <sys/klog.h> /* klogctl() */
117
108
init_gnutls_session(),
118
109
GNUTLS_* */
119
110
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
122
113
123
114
/* GPGME */
124
115
#include <gpgme.h> /* All GPGME types, constants and
132
123
#define PATHDIR "/conf/conf.d/mandos"
133
124
#define SECKEY "seckey.txt"
134
125
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
136
126
137
127
bool debug = false;
138
128
static const char mandos_protocol_version[] = "1";
139
129
const char *argp_program_version = "mandos-client " VERSION;
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
141
131
static const char sys_class_net[] = "/sys/class/net";
142
132
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
146
133
147
134
/* Doubly linked list that need to be circularly linked when used */
148
135
typedef struct server{
149
136
const char *ip;
150
in_port_t port;
137
uint16_t port;
151
138
AvahiIfIndex if_index;
152
139
int af;
153
140
struct timespec last_seen;
157
144
158
145
/* Used for passing in values through the Avahi callback functions */
159
146
typedef struct {
147
AvahiSimplePoll *simple_poll;
160
148
AvahiServer *server;
161
149
gnutls_certificate_credentials_t cred;
162
150
unsigned int dh_bits;
164
152
const char *priority;
165
153
gpgme_ctx_t ctx;
166
154
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
155
} mandos_context;
170
156
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
173
162
174
163
sig_atomic_t quit_now = 0;
175
164
int signal_received = 0;
176
165
177
166
/* Function to use when printing errors */
178
167
void perror_plus(const char *print_text){
179
int e = errno;
180
168
fprintf(stderr, "Mandos plugin %s: ",
181
169
program_invocation_short_name);
182
errno = e;
183
170
perror(print_text);
184
171
}
185
172
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
195
196
173
/*
197
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
175
* bytes. "buffer_capacity" is how much is currently allocated,
199
176
* "buffer_length" is how much is already used.
200
177
*/
201
__attribute__((nonnull, warn_unused_result))
202
178
size_t incbuffer(char **buffer, size_t buffer_length,
203
size_t buffer_capacity){
179
size_t buffer_capacity){
204
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
if(new_buf == NULL){
207
int old_errno = errno;
208
free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
if(buffer == NULL){
211
183
return 0;
212
184
}
213
*buffer = new_buf;
214
185
buffer_capacity += BUFFER_SIZE;
215
186
}
216
187
return buffer_capacity;
217
188
}
218
189
219
190
/* Add server to set of servers to retry periodically */
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
223
194
int ret;
224
195
server *new_server = malloc(sizeof(server));
225
196
if(new_server == NULL){
226
197
perror_plus("malloc");
227
return false;
198
return -1;
228
199
}
229
200
*new_server = (server){ .ip = strdup(ip),
230
.port = port,
231
.if_index = if_index,
232
.af = af };
201
.port = port,
202
.if_index = if_index,
203
.af = af };
233
204
if(new_server->ip == NULL){
234
205
perror_plus("strdup");
235
return false;
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
206
return -1;
241
207
}
242
208
/* Special case of first server */
243
if(*current_server == NULL){
209
if (mc.current_server == NULL){
244
210
new_server->next = new_server;
245
211
new_server->prev = new_server;
246
*current_server = new_server;
212
mc.current_server = new_server;
213
/* Place the new server last in the list */
247
214
} else {
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
251
217
new_server->prev->next = new_server;
252
(*current_server)->prev = new_server;
253
}
254
return true;
218
mc.current_server->prev = new_server;
219
}
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
if(ret == -1){
222
perror_plus("clock_gettime");
223
return -1;
224
}
225
return 0;
255
226
}
256
227
257
228
/*
258
229
* Initialize GPGME.
259
230
*/
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char * const seckey,
262
const char * const pubkey,
263
const char * const tempdir,
264
mandos_context *mc){
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
265
233
gpgme_error_t rc;
266
234
gpgme_engine_info_t engine_info;
267
235
236
268
237
/*
269
238
* Helper function to insert pub and seckey to the engine keyring.
270
239
*/
271
bool import_key(const char * const filename){
240
bool import_key(const char *filename){
272
241
int ret;
273
242
int fd;
274
243
gpgme_data_t pgp_data;
281
250
282
251
rc = gpgme_data_new_from_fd(&pgp_data, fd);
283
252
if(rc != GPG_ERR_NO_ERROR){
284
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
254
gpgme_strsource(rc), gpgme_strerror(rc));
286
255
return false;
287
256
}
288
257
289
rc = gpgme_op_import(mc->ctx, pgp_data);
258
rc = gpgme_op_import(mc.ctx, pgp_data);
290
259
if(rc != GPG_ERR_NO_ERROR){
291
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
293
262
return false;
294
263
}
295
264
302
271
}
303
272
304
273
if(debug){
305
fprintf_plus(stderr, "Initializing GPGME\n");
274
fprintf(stderr, "Initializing GPGME\n");
306
275
}
307
276
308
277
/* Init GPGME */
309
278
gpgme_check_version(NULL);
310
279
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
311
280
if(rc != GPG_ERR_NO_ERROR){
312
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
313
gpgme_strsource(rc), gpgme_strerror(rc));
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
314
283
return false;
315
284
}
316
285
317
286
/* Set GPGME home directory for the OpenPGP engine only */
318
287
rc = gpgme_get_engine_info(&engine_info);
319
288
if(rc != GPG_ERR_NO_ERROR){
320
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
321
gpgme_strsource(rc), gpgme_strerror(rc));
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
322
291
return false;
323
292
}
324
293
while(engine_info != NULL){
330
299
engine_info = engine_info->next;
331
300
}
332
301
if(engine_info == NULL){
333
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
334
tempdir);
302
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
335
303
return false;
336
304
}
337
305
338
306
/* Create new GPGME "context" */
339
rc = gpgme_new(&(mc->ctx));
307
rc = gpgme_new(&(mc.ctx));
340
308
if(rc != GPG_ERR_NO_ERROR){
341
fprintf_plus(stderr, "Mandos plugin mandos-client: "
342
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
343
gpgme_strerror(rc));
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
344
311
return false;
345
312
}
346
313
355
322
* Decrypt OpenPGP data.
356
323
* Returns -1 on error
357
324
*/
358
__attribute__((nonnull, warn_unused_result))
359
325
static ssize_t pgp_packet_decrypt(const char *cryptotext,
360
326
size_t crypto_size,
361
char **plaintext,
362
mandos_context *mc){
327
char **plaintext){
363
328
gpgme_data_t dh_crypto, dh_plain;
364
329
gpgme_error_t rc;
365
330
ssize_t ret;
367
332
ssize_t plaintext_length = 0;
368
333
369
334
if(debug){
370
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
371
336
}
372
337
373
338
/* Create new GPGME data buffer from memory cryptotext */
374
339
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
375
340
0);
376
341
if(rc != GPG_ERR_NO_ERROR){
377
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
gpgme_strsource(rc), gpgme_strerror(rc));
379
344
return -1;
380
345
}
381
346
382
347
/* Create new empty GPGME data buffer for the plaintext */
383
348
rc = gpgme_data_new(&dh_plain);
384
349
if(rc != GPG_ERR_NO_ERROR){
385
fprintf_plus(stderr, "Mandos plugin mandos-client: "
386
"bad gpgme_data_new: %s: %s\n",
387
gpgme_strsource(rc), gpgme_strerror(rc));
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
gpgme_strsource(rc), gpgme_strerror(rc));
388
352
gpgme_data_release(dh_crypto);
389
353
return -1;
390
354
}
391
355
392
356
/* Decrypt data from the cryptotext data buffer to the plaintext
393
357
data buffer */
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
395
359
if(rc != GPG_ERR_NO_ERROR){
396
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
397
gpgme_strsource(rc), gpgme_strerror(rc));
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
398
362
plaintext_length = -1;
399
363
if(debug){
400
364
gpgme_decrypt_result_t result;
401
result = gpgme_op_decrypt_result(mc->ctx);
365
result = gpgme_op_decrypt_result(mc.ctx);
402
366
if(result == NULL){
403
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
404
368
} else {
405
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
406
result->unsupported_algorithm);
407
fprintf_plus(stderr, "Wrong key usage: %u\n",
408
result->wrong_key_usage);
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
result->wrong_key_usage);
409
373
if(result->file_name != NULL){
410
fprintf_plus(stderr, "File name: %s\n", result->file_name);
374
fprintf(stderr, "File name: %s\n", result->file_name);
411
375
}
412
376
gpgme_recipient_t recipient;
413
377
recipient = result->recipients;
414
378
while(recipient != NULL){
415
fprintf_plus(stderr, "Public key algorithm: %s\n",
416
gpgme_pubkey_algo_name
417
(recipient->pubkey_algo));
418
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
419
fprintf_plus(stderr, "Secret key available: %s\n",
420
recipient->status == GPG_ERR_NO_SECKEY
421
? "No" : "Yes");
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");
422
385
recipient = recipient->next;
423
386
}
424
387
}
427
390
}
428
391
429
392
if(debug){
430
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
431
394
}
432
395
433
396
/* Seek back to the beginning of the GPGME plaintext data buffer */
440
403
*plaintext = NULL;
441
404
while(true){
442
405
plaintext_capacity = incbuffer(plaintext,
443
(size_t)plaintext_length,
444
plaintext_capacity);
406
(size_t)plaintext_length,
407
plaintext_capacity);
445
408
if(plaintext_capacity == 0){
446
perror_plus("incbuffer");
447
plaintext_length = -1;
448
goto decrypt_end;
409
perror_plus("incbuffer");
410
plaintext_length = -1;
411
goto decrypt_end;
449
412
}
450
413
451
414
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
464
427
}
465
428
466
429
if(debug){
467
fprintf_plus(stderr, "Decrypted password is: ");
430
fprintf(stderr, "Decrypted password is: ");
468
431
for(ssize_t i = 0; i < plaintext_length; i++){
469
432
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
470
433
}
481
444
return plaintext_length;
482
445
}
483
446
484
__attribute__((warn_unused_result))
485
static const char *safer_gnutls_strerror(int value){
486
const char *ret = gnutls_strerror(value);
447
static const char * safer_gnutls_strerror(int value){
448
const char *ret = gnutls_strerror(value); /* Spurious warning from
449
-Wunreachable-code */
487
450
if(ret == NULL)
488
451
ret = "(unknown)";
489
452
return ret;
490
453
}
491
454
492
455
/* GnuTLS log function callback */
493
__attribute__((nonnull))
494
456
static void debuggnutls(__attribute__((unused)) int level,
495
457
const char* string){
496
fprintf_plus(stderr, "GnuTLS: %s", string);
458
fprintf(stderr, "GnuTLS: %s", string);
497
459
}
498
460
499
__attribute__((nonnull, warn_unused_result))
500
461
static int init_gnutls_global(const char *pubkeyfilename,
501
const char *seckeyfilename,
502
mandos_context *mc){
462
const char *seckeyfilename){
503
463
int ret;
504
464
505
465
if(debug){
506
fprintf_plus(stderr, "Initializing GnuTLS\n");
466
fprintf(stderr, "Initializing GnuTLS\n");
507
467
}
508
468
509
469
ret = gnutls_global_init();
510
470
if(ret != GNUTLS_E_SUCCESS){
511
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
512
safer_gnutls_strerror(ret));
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
513
473
return -1;
514
474
}
515
475
522
482
}
523
483
524
484
/* OpenPGP credentials */
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
526
486
if(ret != GNUTLS_E_SUCCESS){
527
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
528
safer_gnutls_strerror(ret));
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
529
489
gnutls_global_deinit();
530
490
return -1;
531
491
}
532
492
533
493
if(debug){
534
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
535
" secret key %s as GnuTLS credentials\n",
536
pubkeyfilename,
537
seckeyfilename);
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
seckeyfilename);
538
497
}
539
498
540
499
ret = gnutls_certificate_set_openpgp_key_file
541
(mc->cred, pubkeyfilename, seckeyfilename,
500
(mc.cred, pubkeyfilename, seckeyfilename,
542
501
GNUTLS_OPENPGP_FMT_BASE64);
543
502
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr,
545
"Error[%d] while reading the OpenPGP key pair ('%s',"
546
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
547
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
548
safer_gnutls_strerror(ret));
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));
549
508
goto globalfail;
550
509
}
551
510
552
511
/* GnuTLS server initialization */
553
ret = gnutls_dh_params_init(&mc->dh_params);
512
ret = gnutls_dh_params_init(&mc.dh_params);
554
513
if(ret != GNUTLS_E_SUCCESS){
555
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
556
" initialization: %s\n",
557
safer_gnutls_strerror(ret));
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
558
516
goto globalfail;
559
517
}
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
518
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
561
519
if(ret != GNUTLS_E_SUCCESS){
562
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
563
safer_gnutls_strerror(ret));
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
564
522
goto globalfail;
565
523
}
566
524
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
525
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
568
526
569
527
return 0;
570
528
571
529
globalfail:
572
530
573
gnutls_certificate_free_credentials(mc->cred);
531
gnutls_certificate_free_credentials(mc.cred);
574
532
gnutls_global_deinit();
575
gnutls_dh_params_deinit(mc->dh_params);
533
gnutls_dh_params_deinit(mc.dh_params);
576
534
return -1;
577
535
}
578
536
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
581
mandos_context *mc){
537
static int init_gnutls_session(gnutls_session_t *session){
582
538
int ret;
583
539
/* GnuTLS session creation */
584
540
do {
588
544
}
589
545
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
590
546
if(ret != GNUTLS_E_SUCCESS){
591
fprintf_plus(stderr,
592
"Error in GnuTLS session initialization: %s\n",
593
safer_gnutls_strerror(ret));
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
safer_gnutls_strerror(ret));
594
549
}
595
550
596
551
{
597
552
const char *err;
598
553
do {
599
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
554
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
600
555
if(quit_now){
601
556
gnutls_deinit(*session);
602
557
return -1;
603
558
}
604
559
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
605
560
if(ret != GNUTLS_E_SUCCESS){
606
fprintf_plus(stderr, "Syntax error at: %s\n", err);
607
fprintf_plus(stderr, "GnuTLS error: %s\n",
608
safer_gnutls_strerror(ret));
561
fprintf(stderr, "Syntax error at: %s\n", err);
562
fprintf(stderr, "GnuTLS error: %s\n",
563
safer_gnutls_strerror(ret));
609
564
gnutls_deinit(*session);
610
565
return -1;
611
566
}
613
568
614
569
do {
615
570
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
616
mc->cred);
571
mc.cred);
617
572
if(quit_now){
618
573
gnutls_deinit(*session);
619
574
return -1;
620
575
}
621
576
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
622
577
if(ret != GNUTLS_E_SUCCESS){
623
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
624
safer_gnutls_strerror(ret));
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
safer_gnutls_strerror(ret));
625
580
gnutls_deinit(*session);
626
581
return -1;
627
582
}
629
584
/* ignore client certificate if any. */
630
585
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
631
586
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
587
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
633
588
634
589
return 0;
635
590
}
639
594
__attribute__((unused)) const char *txt){}
640
595
641
596
/* Called when a Mandos server is found */
642
__attribute__((nonnull, warn_unused_result))
643
static int start_mandos_communication(const char *ip, in_port_t port,
597
static int start_mandos_communication(const char *ip, uint16_t port,
644
598
AvahiIfIndex if_index,
645
int af, mandos_context *mc){
599
int af){
646
600
int ret, tcp_sd = -1;
647
601
ssize_t sret;
648
struct sockaddr_storage to;
602
union {
603
struct sockaddr_in in;
604
struct sockaddr_in6 in6;
605
} to;
649
606
char *buffer = NULL;
650
607
char *decrypted_buffer = NULL;
651
608
size_t buffer_length = 0;
670
627
pf = PF_INET;
671
628
break;
672
629
default:
673
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
fprintf(stderr, "Bad address family: %d\n", af);
674
631
errno = EINVAL;
675
632
return -1;
676
633
}
677
634
678
/* If the interface is specified and we have a list of interfaces */
679
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
680
/* Check if the interface is one of the interfaces we are using */
681
bool match = false;
682
{
683
char *interface = NULL;
684
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
685
interface))){
686
if(if_nametoindex(interface) == (unsigned int)if_index){
687
match = true;
688
break;
689
}
690
}
691
}
692
if(not match){
693
/* This interface does not match any in the list, so we don't
694
connect to the server */
695
if(debug){
696
char interface[IF_NAMESIZE];
697
if(if_indextoname((unsigned int)if_index, interface) == NULL){
698
perror_plus("if_indextoname");
699
} else {
700
fprintf_plus(stderr, "Skipping server on non-used interface"
701
" \"%s\"\n",
702
if_indextoname((unsigned int)if_index,
703
interface));
704
}
705
}
706
return -1;
707
}
708
}
709
710
ret = init_gnutls_session(&session, mc);
635
ret = init_gnutls_session(&session);
711
636
if(ret != 0){
712
637
return -1;
713
638
}
714
639
715
640
if(debug){
716
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
717
PRIuMAX "\n", ip, (uintmax_t)port);
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
718
643
}
719
644
720
645
tcp_sd = socket(pf, SOCK_STREAM, 0);
732
657
733
658
memset(&to, 0, sizeof(to));
734
659
if(af == AF_INET6){
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
660
to.in6.sin6_family = (sa_family_t)af;
661
ret = inet_pton(af, ip, &to.in6.sin6_addr);
737
662
} else { /* IPv4 */
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
663
to.in.sin_family = (sa_family_t)af;
664
ret = inet_pton(af, ip, &to.in.sin_addr);
740
665
}
741
666
if(ret < 0 ){
742
667
int e = errno;
746
671
}
747
672
if(ret == 0){
748
673
int e = errno;
749
fprintf_plus(stderr, "Bad address: %s\n", ip);
674
fprintf(stderr, "Bad address: %s\n", ip);
750
675
errno = e;
751
676
goto mandos_end;
752
677
}
753
678
if(af == AF_INET6){
754
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
755
if(IN6_IS_ADDR_LINKLOCAL
756
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
679
to.in6.sin6_port = htons(port); /* Spurious warnings from
680
-Wconversion and
681
-Wunreachable-code */
682
683
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
684
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
685
-Wunreachable-code*/
757
686
if(if_index == AVAHI_IF_UNSPEC){
758
fprintf_plus(stderr, "An IPv6 link-local address is"
759
" incomplete without a network interface\n");
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
760
689
errno = EINVAL;
761
690
goto mandos_end;
762
691
}
763
692
/* Set the network interface number as scope */
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
693
to.in6.sin6_scope_id = (uint32_t)if_index;
765
694
}
766
695
} else {
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
696
to.in.sin_port = htons(port); /* Spurious warnings from
697
-Wconversion and
698
-Wunreachable-code */
768
699
}
769
700
770
701
if(quit_now){
778
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
779
710
perror_plus("if_indextoname");
780
711
} else {
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
783
714
}
784
715
} else {
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
787
718
}
788
719
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
789
720
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
721
const char *pcret;
790
722
if(af == AF_INET6){
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
794
NI_NUMERICHOST);
723
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
724
sizeof(addrstr));
795
725
} else {
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
726
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
727
sizeof(addrstr));
800
728
}
801
if(ret == EAI_SYSTEM){
802
perror_plus("getnameinfo");
803
} else if(ret != 0) {
804
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
805
} else if(strcmp(addrstr, ip) != 0){
806
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
729
if(pcret == NULL){
730
perror_plus("inet_ntop");
731
} else {
732
if(strcmp(addrstr, ip) != 0){
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
734
}
807
735
}
808
736
}
809
737
813
741
}
814
742
815
743
if(af == AF_INET6){
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
744
ret = connect(tcp_sd, &to.in6, sizeof(to));
818
745
} else {
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
746
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
821
747
}
822
748
if(ret < 0){
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
824
750
int e = errno;
825
751
perror_plus("connect");
826
752
errno = e;
838
764
while(true){
839
765
size_t out_size = strlen(out);
840
766
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
841
out_size - written));
767
out_size - written));
842
768
if(ret == -1){
843
769
int e = errno;
844
770
perror_plus("write");
864
790
}
865
791
866
792
if(debug){
867
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
868
794
}
869
795
870
796
if(quit_now){
872
798
goto mandos_end;
873
799
}
874
800
875
/* This casting via intptr_t is to eliminate warning about casting
876
an int to a pointer type. This is exactly how the GnuTLS Guile
877
function "set-session-transport-fd!" does it. */
878
gnutls_transport_set_ptr(session,
879
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
801
/* Spurious warning from -Wint-to-pointer-cast */
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
880
803
881
804
if(quit_now){
882
805
errno = EINTR;
893
816
894
817
if(ret != GNUTLS_E_SUCCESS){
895
818
if(debug){
896
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
897
820
gnutls_perror(ret);
898
821
}
899
822
errno = EPROTO;
903
826
/* Read OpenPGP packet that contains the wanted password */
904
827
905
828
if(debug){
906
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
907
" %s\n", ip);
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
830
ip);
908
831
}
909
832
910
833
while(true){
915
838
}
916
839
917
840
buffer_capacity = incbuffer(&buffer, buffer_length,
918
buffer_capacity);
841
buffer_capacity);
919
842
if(buffer_capacity == 0){
920
843
int e = errno;
921
844
perror_plus("incbuffer");
948
871
}
949
872
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
950
873
if(ret < 0){
951
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
952
"***\n");
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
953
875
gnutls_perror(ret);
954
876
errno = EPROTO;
955
877
goto mandos_end;
956
878
}
957
879
break;
958
880
default:
959
fprintf_plus(stderr, "Unknown error while reading data from"
960
" encrypted session with Mandos server\n");
881
fprintf(stderr, "Unknown error while reading data from"
882
" encrypted session with Mandos server\n");
961
883
gnutls_bye(session, GNUTLS_SHUT_RDWR);
962
884
errno = EIO;
963
885
goto mandos_end;
968
890
}
969
891
970
892
if(debug){
971
fprintf_plus(stderr, "Closing TLS session\n");
893
fprintf(stderr, "Closing TLS session\n");
972
894
}
973
895
974
896
if(quit_now){
986
908
987
909
if(buffer_length > 0){
988
910
ssize_t decrypted_buffer_size;
989
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
990
&decrypted_buffer, mc);
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
buffer_length,
913
&decrypted_buffer);
991
914
if(decrypted_buffer_size >= 0){
992
915
993
916
written = 0;
1003
926
if(ret == 0 and ferror(stdout)){
1004
927
int e = errno;
1005
928
if(debug){
1006
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1007
strerror(errno));
929
fprintf(stderr, "Error writing encrypted data: %s\n",
930
strerror(errno));
1008
931
}
1009
932
errno = e;
1010
933
goto mandos_end;
1041
964
return retval;
1042
965
}
1043
966
1044
__attribute__((nonnull))
1045
967
static void resolve_callback(AvahiSServiceResolver *r,
1046
968
AvahiIfIndex interface,
1047
969
AvahiProtocol proto,
1055
977
AVAHI_GCC_UNUSED AvahiStringList *txt,
1056
978
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1057
979
flags,
1058
void *mc){
1059
if(r == NULL){
1060
return;
1061
}
980
AVAHI_GCC_UNUSED void* userdata){
981
assert(r);
1062
982
1063
983
/* Called whenever a service has been resolved successfully or
1064
984
timed out */
1070
990
switch(event){
1071
991
default:
1072
992
case AVAHI_RESOLVER_FAILURE:
1073
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1074
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1075
domain,
1076
avahi_strerror(avahi_server_errno
1077
(((mandos_context*)mc)->server)));
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)));
1078
996
break;
1079
997
1080
998
case AVAHI_RESOLVER_FOUND:
1082
1000
char ip[AVAHI_ADDRESS_STR_MAX];
1083
1001
avahi_address_snprint(ip, sizeof(ip), address);
1084
1002
if(debug){
1085
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1086
PRIdMAX ") on port %" PRIu16 "\n", name,
1087
host_name, ip, (intmax_t)interface, port);
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);
1088
1006
}
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1090
interface,
1091
avahi_proto_to_af(proto),
1092
mc);
1007
int ret = start_mandos_communication(ip, port, interface,
1008
avahi_proto_to_af(proto));
1093
1009
if(ret == 0){
1094
avahi_simple_poll_quit(simple_poll);
1010
avahi_simple_poll_quit(mc.simple_poll);
1095
1011
} else {
1096
if(not add_server(ip, (in_port_t)port, interface,
1097
avahi_proto_to_af(proto),
1098
&((mandos_context*)mc)->current_server)){
1099
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1100
" list\n", name);
1101
}
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1102
1014
}
1103
1015
}
1104
1016
}
1114
1026
const char *domain,
1115
1027
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1116
1028
flags,
1117
void *mc){
1118
if(b == NULL){
1119
return;
1120
}
1029
AVAHI_GCC_UNUSED void* userdata){
1030
assert(b);
1121
1031
1122
1032
/* Called whenever a new services becomes available on the LAN or
1123
1033
is removed from the LAN */
1130
1040
default:
1131
1041
case AVAHI_BROWSER_FAILURE:
1132
1042
1133
fprintf_plus(stderr, "(Avahi browser) %s\n",
1134
avahi_strerror(avahi_server_errno
1135
(((mandos_context*)mc)->server)));
1136
avahi_simple_poll_quit(simple_poll);
1043
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1045
avahi_simple_poll_quit(mc.simple_poll);
1137
1046
return;
1138
1047
1139
1048
case AVAHI_BROWSER_NEW:
1142
1051
the callback function is called the Avahi server will free the
1143
1052
resolver for us. */
1144
1053
1145
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1146
interface, protocol, name, type,
1147
domain, protocol, 0,
1148
resolve_callback, mc) == NULL)
1149
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1150
" %s\n", name,
1151
avahi_strerror(avahi_server_errno
1152
(((mandos_context*)mc)->server)));
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)));
1153
1059
break;
1154
1060
1155
1061
case AVAHI_BROWSER_REMOVE:
1158
1064
case AVAHI_BROWSER_ALL_FOR_NOW:
1159
1065
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1160
1066
if(debug){
1161
fprintf_plus(stderr, "No Mandos server found, still"
1162
" searching...\n");
1067
fprintf(stderr, "No Mandos server found, still searching...\n");
1163
1068
}
1164
1069
break;
1165
1070
}
1174
1079
signal_received = sig;
1175
1080
int old_errno = errno;
1176
1081
/* set main loop to exit */
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1082
if(mc.simple_poll != NULL){
1083
avahi_simple_poll_quit(mc.simple_poll);
1179
1084
}
1180
1085
errno = old_errno;
1181
1086
}
1182
1087
1183
__attribute__((nonnull, warn_unused_result))
1184
bool get_flags(const char *ifname, struct ifreq *ifr){
1185
int ret;
1186
error_t ret_errno;
1187
1188
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1189
if(s < 0){
1190
ret_errno = errno;
1191
perror_plus("socket");
1192
errno = ret_errno;
1193
return false;
1194
}
1195
strcpy(ifr->ifr_name, ifname);
1196
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1197
if(ret == -1){
1088
/*
1089
* This function determines if a directory entry in /sys/class/net
1090
* corresponds to an acceptable network device.
1091
* (This function is passed to scandir(3) as a filter function.)
1092
*/
1093
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
char *flagname = NULL;
1096
if(if_entry->d_name[0] == '.'){
1097
return 0;
1098
}
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){
1198
1144
if(debug){
1199
ret_errno = errno;
1200
perror_plus("ioctl SIOCGIFFLAGS");
1201
errno = ret_errno;
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1202
1147
}
1203
return false;
1148
free(flagstring);
1149
return 0;
1204
1150
}
1205
return true;
1206
}
1207
1208
__attribute__((nonnull, warn_unused_result))
1209
bool good_flags(const char *ifname, const struct ifreq *ifr){
1210
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1211
1153
/* Reject the loopback device */
1212
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
if(flags & IFF_LOOPBACK){
1213
1155
if(debug){
1214
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1215
ifname);
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1216
1158
}
1217
return false;
1159
return 0;
1218
1160
}
1219
1161
/* Accept point-to-point devices only if connect_to is specified */
1220
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1221
1163
if(debug){
1222
fprintf_plus(stderr, "Accepting point-to-point interface"
1223
" \"%s\"\n", ifname);
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1224
1166
}
1225
return true;
1167
return 1;
1226
1168
}
1227
1169
/* Otherwise, reject non-broadcast-capable devices */
1228
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
if(not (flags & IFF_BROADCAST)){
1229
1171
if(debug){
1230
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1231
" \"%s\"\n", ifname);
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1232
1174
}
1233
return false;
1175
return 0;
1234
1176
}
1235
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1236
if(ifr->ifr_flags & IFF_NOARP){
1178
if(flags & IFF_NOARP){
1237
1179
if(debug){
1238
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1239
ifname);
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1240
1182
}
1241
return false;
1183
return 0;
1242
1184
}
1243
1244
1185
/* Accept this device */
1245
1186
if(debug){
1246
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1247
}
1248
return true;
1249
}
1250
1251
/*
1252
* This function determines if a directory entry in /sys/class/net
1253
* corresponds to an acceptable network device.
1254
* (This function is passed to scandir(3) as a filter function.)
1255
*/
1256
__attribute__((nonnull, warn_unused_result))
1257
int good_interface(const struct dirent *if_entry){
1258
if(if_entry->d_name[0] == '.'){
1259
return 0;
1260
}
1261
1262
struct ifreq ifr;
1263
if(not get_flags(if_entry->d_name, &ifr)){
1264
if(debug){
1265
fprintf_plus(stderr, "Failed to get flags for interface "
1266
"\"%s\"\n", if_entry->d_name);
1267
}
1268
return 0;
1269
}
1270
1271
if(not good_flags(if_entry->d_name, &ifr)){
1272
return 0;
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
1273
1189
}
1274
1190
return 1;
1275
1191
}
1276
1192
1277
/*
1278
* This function determines if a network interface is up.
1279
*/
1280
__attribute__((nonnull, warn_unused_result))
1281
bool interface_is_up(const char *interface){
1282
struct ifreq ifr;
1283
if(not get_flags(interface, &ifr)){
1284
if(debug){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1287
}
1288
return false;
1289
}
1290
1291
return (bool)(ifr.ifr_flags & IFF_UP);
1292
}
1293
1294
/*
1295
* This function determines if a network interface is running
1296
*/
1297
__attribute__((nonnull, warn_unused_result))
1298
bool interface_is_running(const char *interface){
1299
struct ifreq ifr;
1300
if(not get_flags(interface, &ifr)){
1301
if(debug){
1302
fprintf_plus(stderr, "Failed to get flags for interface "
1303
"\"%s\"\n", interface);
1304
}
1305
return false;
1306
}
1307
1308
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1309
}
1310
1311
__attribute__((nonnull, pure, warn_unused_result))
1312
1193
int notdotentries(const struct dirent *direntry){
1313
1194
/* Skip "." and ".." */
1314
1195
if(direntry->d_name[0] == '.'
1320
1201
return 1;
1321
1202
}
1322
1203
1323
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1325
int runnable_hook(const struct dirent *direntry){
1326
int ret;
1327
size_t sret;
1328
struct stat st;
1329
1330
if((direntry->d_name)[0] == '\0'){
1331
/* Empty name? */
1332
return 0;
1333
}
1334
1335
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1336
"abcdefghijklmnopqrstuvwxyz"
1337
"0123456789"
1338
"_-");
1339
if((direntry->d_name)[sret] != '\0'){
1340
/* Contains non-allowed characters */
1341
if(debug){
1342
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1343
direntry->d_name);
1344
}
1345
return 0;
1346
}
1347
1348
char *fullname = NULL;
1349
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1350
if(ret < 0){
1351
perror_plus("asprintf");
1352
return 0;
1353
}
1354
1355
ret = stat(fullname, &st);
1356
if(ret == -1){
1357
if(debug){
1358
perror_plus("Could not stat hook");
1359
}
1360
return 0;
1361
}
1362
if(not (S_ISREG(st.st_mode))){
1363
/* Not a regular file */
1364
if(debug){
1365
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1366
direntry->d_name);
1367
}
1368
return 0;
1369
}
1370
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1371
/* Not executable */
1372
if(debug){
1373
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1374
direntry->d_name);
1375
}
1376
return 0;
1377
}
1378
if(debug){
1379
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1380
direntry->d_name);
1381
}
1382
return 1;
1383
}
1384
1385
__attribute__((nonnull, warn_unused_result))
1386
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1387
mandos_context *mc){
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1388
1205
int ret;
1389
1206
struct timespec now;
1390
1207
struct timespec waited_time;
1391
1208
intmax_t block_time;
1392
1209
1393
1210
while(true){
1394
if(mc->current_server == NULL){
1395
if(debug){
1396
fprintf_plus(stderr, "Wait until first server is found."
1397
" No timeout!\n");
1211
if(mc.current_server == NULL){
1212
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1398
1215
}
1399
1216
ret = avahi_simple_poll_iterate(s, -1);
1400
1217
} else {
1401
if(debug){
1402
fprintf_plus(stderr, "Check current_server if we should run"
1403
" it, or wait\n");
1218
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1404
1221
}
1405
1222
/* the current time */
1406
1223
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1411
1228
/* Calculating in ms how long time between now and server
1412
1229
who we visted longest time ago. Now - last seen. */
1413
1230
waited_time.tv_sec = (now.tv_sec
1414
- mc->current_server->last_seen.tv_sec);
1231
- mc.current_server->last_seen.tv_sec);
1415
1232
waited_time.tv_nsec = (now.tv_nsec
1416
- mc->current_server->last_seen.tv_nsec);
1233
- mc.current_server->last_seen.tv_nsec);
1417
1234
/* total time is 10s/10,000ms.
1418
1235
Converting to s from ms by dividing by 1,000,
1419
1236
and ns to ms by dividing by 1,000,000. */
1421
1238
- ((intmax_t)waited_time.tv_sec * 1000))
1422
1239
- ((intmax_t)waited_time.tv_nsec / 1000000));
1423
1240
1424
if(debug){
1425
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1426
block_time);
1241
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1427
1243
}
1428
1244
1429
1245
if(block_time <= 0){
1430
ret = start_mandos_communication(mc->current_server->ip,
1431
mc->current_server->port,
1432
mc->current_server->if_index,
1433
mc->current_server->af, mc);
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);
1434
1250
if(ret == 0){
1435
avahi_simple_poll_quit(s);
1251
avahi_simple_poll_quit(mc.simple_poll);
1436
1252
return 0;
1437
1253
}
1438
1254
ret = clock_gettime(CLOCK_MONOTONIC,
1439
&mc->current_server->last_seen);
1255
&mc.current_server->last_seen);
1440
1256
if(ret == -1){
1441
1257
perror_plus("clock_gettime");
1442
1258
return -1;
1443
1259
}
1444
mc->current_server = mc->current_server->next;
1260
mc.current_server = mc.current_server->next;
1445
1261
block_time = 0; /* Call avahi to find new Mandos
1446
1262
servers, but don't block */
1447
1263
}
1449
1265
ret = avahi_simple_poll_iterate(s, (int)block_time);
1450
1266
}
1451
1267
if(ret != 0){
1452
if(ret > 0 or errno != EINTR){
1268
if (ret > 0 or errno != EINTR) {
1453
1269
return (ret != 1) ? ret : 0;
1454
1270
}
1455
1271
}
1456
1272
}
1457
1273
}
1458
1274
1459
/* Set effective uid to 0, return errno */
1460
__attribute__((warn_unused_result))
1461
error_t raise_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(0) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Set effective and real user ID to 0. Return errno. */
1473
__attribute__((warn_unused_result))
1474
error_t raise_privileges_permanently(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = raise_privileges();
1477
if(ret_errno != 0){
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
if(setuid(0) == -1){
1482
ret_errno = errno;
1483
perror_plus("seteuid");
1484
}
1485
errno = old_errno;
1486
return ret_errno;
1487
}
1488
1489
/* Set effective user ID to unprivileged saved user ID */
1490
__attribute__((warn_unused_result))
1491
error_t lower_privileges(void){
1492
error_t old_errno = errno;
1493
error_t ret_errno = 0;
1494
if(seteuid(uid) == -1){
1495
ret_errno = errno;
1496
perror_plus("seteuid");
1497
}
1498
errno = old_errno;
1499
return ret_errno;
1500
}
1501
1502
/* Lower privileges permanently */
1503
__attribute__((warn_unused_result))
1504
error_t lower_privileges_permanently(void){
1505
error_t old_errno = errno;
1506
error_t ret_errno = 0;
1507
if(setuid(uid) == -1){
1508
ret_errno = errno;
1509
perror_plus("setuid");
1510
}
1511
errno = old_errno;
1512
return ret_errno;
1513
}
1514
1515
__attribute__((nonnull))
1516
void run_network_hooks(const char *mode, const char *interface,
1517
const float delay){
1518
struct dirent **direntries;
1519
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1520
alphasort);
1521
if(numhooks == -1){
1522
if(errno == ENOENT){
1523
if(debug){
1524
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1525
" found\n", hookdir);
1526
}
1527
} else {
1528
perror_plus("scandir");
1529
}
1530
} else {
1531
struct dirent *direntry;
1532
int ret;
1533
int devnull = open("/dev/null", O_RDONLY);
1534
for(int i = 0; i < numhooks; i++){
1535
direntry = direntries[i];
1536
char *fullname = NULL;
1537
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1538
if(ret < 0){
1539
perror_plus("asprintf");
1540
continue;
1541
}
1542
if(debug){
1543
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1544
direntry->d_name);
1545
}
1546
pid_t hook_pid = fork();
1547
if(hook_pid == 0){
1548
/* Child */
1549
/* Raise privileges */
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1552
_exit(EX_NOPERM);
1553
}
1554
/* Set group */
1555
errno = 0;
1556
ret = setgid(0);
1557
if(ret == -1){
1558
perror_plus("setgid");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Reset supplementary groups */
1562
errno = 0;
1563
ret = setgroups(0, NULL);
1564
if(ret == -1){
1565
perror_plus("setgroups");
1566
_exit(EX_NOPERM);
1567
}
1568
ret = dup2(devnull, STDIN_FILENO);
1569
if(ret == -1){
1570
perror_plus("dup2(devnull, STDIN_FILENO)");
1571
_exit(EX_OSERR);
1572
}
1573
ret = close(devnull);
1574
if(ret == -1){
1575
perror_plus("close");
1576
_exit(EX_OSERR);
1577
}
1578
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1579
if(ret == -1){
1580
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1581
_exit(EX_OSERR);
1582
}
1583
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1584
if(ret == -1){
1585
perror_plus("setenv");
1586
_exit(EX_OSERR);
1587
}
1588
ret = setenv("DEVICE", interface, 1);
1589
if(ret == -1){
1590
perror_plus("setenv");
1591
_exit(EX_OSERR);
1592
}
1593
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1594
if(ret == -1){
1595
perror_plus("setenv");
1596
_exit(EX_OSERR);
1597
}
1598
ret = setenv("MODE", mode, 1);
1599
if(ret == -1){
1600
perror_plus("setenv");
1601
_exit(EX_OSERR);
1602
}
1603
char *delaystring;
1604
ret = asprintf(&delaystring, "%f", (double)delay);
1605
if(ret == -1){
1606
perror_plus("asprintf");
1607
_exit(EX_OSERR);
1608
}
1609
ret = setenv("DELAY", delaystring, 1);
1610
if(ret == -1){
1611
free(delaystring);
1612
perror_plus("setenv");
1613
_exit(EX_OSERR);
1614
}
1615
free(delaystring);
1616
if(connect_to != NULL){
1617
ret = setenv("CONNECT", connect_to, 1);
1618
if(ret == -1){
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
}
1623
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1624
perror_plus("execl");
1625
_exit(EXIT_FAILURE);
1626
}
1627
} else {
1628
int status;
1629
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1630
perror_plus("waitpid");
1631
free(fullname);
1632
continue;
1633
}
1634
if(WIFEXITED(status)){
1635
if(WEXITSTATUS(status) != 0){
1636
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1637
" with status %d\n", direntry->d_name,
1638
WEXITSTATUS(status));
1639
free(fullname);
1640
continue;
1641
}
1642
} else if(WIFSIGNALED(status)){
1643
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1644
" signal %d\n", direntry->d_name,
1645
WTERMSIG(status));
1646
free(fullname);
1647
continue;
1648
} else {
1649
fprintf_plus(stderr, "Warning: network hook \"%s\""
1650
" crashed\n", direntry->d_name);
1651
free(fullname);
1652
continue;
1653
}
1654
}
1655
free(fullname);
1656
if(debug){
1657
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1658
direntry->d_name);
1659
}
1660
}
1661
close(devnull);
1662
}
1663
}
1664
1665
__attribute__((nonnull, warn_unused_result))
1666
error_t bring_up_interface(const char *const interface,
1667
const float delay){
1668
error_t old_errno = errno;
1669
int ret;
1670
struct ifreq network;
1671
unsigned int if_index = if_nametoindex(interface);
1672
if(if_index == 0){
1673
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1674
errno = old_errno;
1675
return ENXIO;
1676
}
1677
1678
if(quit_now){
1679
errno = old_errno;
1680
return EINTR;
1681
}
1682
1683
if(not interface_is_up(interface)){
1684
error_t ret_errno = 0, ioctl_errno = 0;
1685
if(not get_flags(interface, &network)){
1686
ret_errno = errno;
1687
fprintf_plus(stderr, "Failed to get flags for interface "
1688
"\"%s\"\n", interface);
1689
errno = old_errno;
1690
return ret_errno;
1691
}
1692
network.ifr_flags |= IFF_UP; /* set flag */
1693
1694
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1695
if(sd == -1){
1696
ret_errno = errno;
1697
perror_plus("socket");
1698
errno = old_errno;
1699
return ret_errno;
1700
}
1701
1702
if(quit_now){
1703
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1704
if(ret == -1){
1705
perror_plus("close");
1706
}
1707
errno = old_errno;
1708
return EINTR;
1709
}
1710
1711
if(debug){
1712
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1713
interface);
1714
}
1715
1716
/* Raise privileges */
1717
ret_errno = raise_privileges();
1718
if(ret_errno != 0){
1719
perror_plus("Failed to raise privileges");
1720
}
1721
1722
#ifdef __linux__
1723
int ret_linux;
1724
bool restore_loglevel = false;
1725
if(ret_errno == 0){
1726
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1727
messages about the network interface to mess up the prompt */
1728
ret_linux = klogctl(8, NULL, 5);
1729
if(ret_linux == -1){
1730
perror_plus("klogctl");
1731
} else {
1732
restore_loglevel = true;
1733
}
1734
}
1735
#endif /* __linux__ */
1736
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1737
ioctl_errno = errno;
1738
#ifdef __linux__
1739
if(restore_loglevel){
1740
ret_linux = klogctl(7, NULL, 0);
1741
if(ret_linux == -1){
1742
perror_plus("klogctl");
1743
}
1744
}
1745
#endif /* __linux__ */
1746
1747
/* If raise_privileges() succeeded above */
1748
if(ret_errno == 0){
1749
/* Lower privileges */
1750
ret_errno = lower_privileges();
1751
if(ret_errno != 0){
1752
errno = ret_errno;
1753
perror_plus("Failed to lower privileges");
1754
}
1755
}
1756
1757
/* Close the socket */
1758
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1759
if(ret == -1){
1760
perror_plus("close");
1761
}
1762
1763
if(ret_setflags == -1){
1764
errno = ioctl_errno;
1765
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1766
errno = old_errno;
1767
return ioctl_errno;
1768
}
1769
} else if(debug){
1770
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1771
interface);
1772
}
1773
1774
/* Sleep checking until interface is running.
1775
Check every 0.25s, up to total time of delay */
1776
for(int i=0; i < delay * 4; i++){
1777
if(interface_is_running(interface)){
1778
break;
1779
}
1780
struct timespec sleeptime = { .tv_nsec = 250000000 };
1781
ret = nanosleep(&sleeptime, NULL);
1782
if(ret == -1 and errno != EINTR){
1783
perror_plus("nanosleep");
1784
}
1785
}
1786
1787
errno = old_errno;
1788
return 0;
1789
}
1790
1791
__attribute__((nonnull, warn_unused_result))
1792
error_t take_down_interface(const char *const interface){
1793
error_t old_errno = errno;
1794
struct ifreq network;
1795
unsigned int if_index = if_nametoindex(interface);
1796
if(if_index == 0){
1797
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1798
errno = old_errno;
1799
return ENXIO;
1800
}
1801
if(interface_is_up(interface)){
1802
error_t ret_errno = 0, ioctl_errno = 0;
1803
if(not get_flags(interface, &network) and debug){
1804
ret_errno = errno;
1805
fprintf_plus(stderr, "Failed to get flags for interface "
1806
"\"%s\"\n", interface);
1807
errno = old_errno;
1808
return ret_errno;
1809
}
1810
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1811
1812
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1813
if(sd == -1){
1814
ret_errno = errno;
1815
perror_plus("socket");
1816
errno = old_errno;
1817
return ret_errno;
1818
}
1819
1820
if(debug){
1821
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1822
interface);
1823
}
1824
1825
/* Raise privileges */
1826
ret_errno = raise_privileges();
1827
if(ret_errno != 0){
1828
perror_plus("Failed to raise privileges");
1829
}
1830
1831
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1832
ioctl_errno = errno;
1833
1834
/* If raise_privileges() succeeded above */
1835
if(ret_errno == 0){
1836
/* Lower privileges */
1837
ret_errno = lower_privileges();
1838
if(ret_errno != 0){
1839
errno = ret_errno;
1840
perror_plus("Failed to lower privileges");
1841
}
1842
}
1843
1844
/* Close the socket */
1845
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1846
if(ret == -1){
1847
perror_plus("close");
1848
}
1849
1850
if(ret_setflags == -1){
1851
errno = ioctl_errno;
1852
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1853
errno = old_errno;
1854
return ioctl_errno;
1855
}
1856
} else if(debug){
1857
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1858
interface);
1859
}
1860
1861
errno = old_errno;
1862
return 0;
1863
}
1864
1865
1275
int main(int argc, char *argv[]){
1866
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1867
.priority = "SECURE256:!CTYPE-X.509:"
1868
"+CTYPE-OPENPGP", .current_server = NULL,
1869
.interfaces = NULL, .interfaces_size = 0 };
1870
1276
AvahiSServiceBrowser *sb = NULL;
1871
error_t ret_errno;
1277
int error;
1872
1278
int ret;
1873
1279
intmax_t tmpmax;
1874
1280
char *tmp;
1875
1281
int exitcode = EXIT_SUCCESS;
1876
char *interfaces_to_take_down = NULL;
1877
size_t interfaces_to_take_down_size = 0;
1878
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1879
char old_tempdir[] = "/tmp/mandosXXXXXX";
1880
char *tempdir = NULL;
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;
1288
char tempdir[] = "/tmp/mandosXXXXXX";
1289
bool tempdir_created = false;
1881
1290
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1882
1291
const char *seckey = PATHDIR "/" SECKEY;
1883
1292
const char *pubkey = PATHDIR "/" PUBKEY;
1884
char *interfaces_hooks = NULL;
1885
1293
1886
1294
bool gnutls_initialized = false;
1887
1295
bool gpgme_initialized = false;
1949
1357
.group = 2 },
1950
1358
{ .name = "retry", .key = 132,
1951
1359
.arg = "SECONDS",
1952
.doc = "Retry interval used when denied by the Mandos server",
1953
.group = 2 },
1954
{ .name = "network-hook-dir", .key = 133,
1955
.arg = "DIR",
1956
.doc = "Directory where network hooks are located",
1360
.doc = "Retry interval used when denied by the mandos server",
1957
1361
.group = 2 },
1958
1362
/*
1959
1363
* These reproduce what we would get without ARGP_NO_HELP
1978
1382
connect_to = arg;
1979
1383
break;
1980
1384
case 'i': /* --interface */
1981
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1982
arg, (int)',');
1983
if(ret_errno != 0){
1984
argp_error(state, "%s", strerror(ret_errno));
1985
}
1385
interface = arg;
1986
1386
break;
1987
1387
case 's': /* --seckey */
1988
1388
seckey = arg;
2017
1417
argp_error(state, "Bad retry interval");
2018
1418
}
2019
1419
break;
2020
case 133: /* --network-hook-dir */
2021
hookdir = arg;
2022
break;
2023
1420
/*
2024
1421
* These reproduce what we would get without ARGP_NO_HELP
2025
1422
*/
2031
1428
argp_state_help(state, state->out_stream,
2032
1429
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2033
1430
case 'V': /* --version */
2034
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
2035
1432
exit(argp_err_exit_status);
2036
1433
break;
2037
1434
default:
2064
1461
{
2065
1462
/* Work around Debian bug #633582:
2066
1463
<http://bugs.debian.org/633582> */
2067
2068
/* Re-raise privileges */
2069
ret_errno = raise_privileges();
2070
if(ret_errno != 0){
2071
errno = ret_errno;
2072
perror_plus("Failed to raise privileges");
2073
} else {
2074
struct stat st;
2075
2076
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2077
int seckey_fd = open(seckey, O_RDONLY);
2078
if(seckey_fd == -1){
2079
perror_plus("open");
2080
} else {
2081
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2082
if(ret == -1){
2083
perror_plus("fstat");
2084
} else {
2085
if(S_ISREG(st.st_mode)
2086
and st.st_uid == 0 and st.st_gid == 0){
2087
ret = fchown(seckey_fd, uid, gid);
2088
if(ret == -1){
2089
perror_plus("fchown");
2090
}
2091
}
2092
}
2093
TEMP_FAILURE_RETRY(close(seckey_fd));
2094
}
2095
}
2096
2097
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2098
int pubkey_fd = open(pubkey, O_RDONLY);
2099
if(pubkey_fd == -1){
2100
perror_plus("open");
2101
} else {
2102
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2103
if(ret == -1){
2104
perror_plus("fstat");
2105
} else {
2106
if(S_ISREG(st.st_mode)
2107
and st.st_uid == 0 and st.st_gid == 0){
2108
ret = fchown(pubkey_fd, uid, gid);
2109
if(ret == -1){
2110
perror_plus("fchown");
2111
}
2112
}
2113
}
2114
TEMP_FAILURE_RETRY(close(pubkey_fd));
2115
}
2116
}
2117
2118
/* Lower privileges */
2119
ret_errno = lower_privileges();
2120
if(ret_errno != 0){
2121
errno = ret_errno;
2122
perror_plus("Failed to lower privileges");
2123
}
2124
}
2125
}
2126
2127
/* Remove invalid interface names (except "none") */
2128
{
2129
char *interface = NULL;
2130
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2131
interface))){
2132
if(strcmp(interface, "none") != 0
2133
and if_nametoindex(interface) == 0){
2134
if(interface[0] != '\0'){
2135
fprintf_plus(stderr, "Not using nonexisting interface"
2136
" \"%s\"\n", interface);
2137
}
2138
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2139
interface = NULL;
2140
}
2141
}
2142
}
2143
2144
/* Run network hooks */
2145
{
2146
if(mc.interfaces != NULL){
2147
interfaces_hooks = malloc(mc.interfaces_size);
2148
if(interfaces_hooks == NULL){
2149
perror_plus("malloc");
2150
goto end;
2151
}
2152
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2153
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2154
}
2155
run_network_hooks("start", interfaces_hooks != NULL ?
2156
interfaces_hooks : "", delay);
1464
struct stat st;
1465
1466
/* 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");
1518
}
2157
1519
}
2158
1520
2159
1521
if(not debug){
2160
1522
avahi_set_log_function(empty_log);
2161
1523
}
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
}
2162
1549
2163
1550
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2164
1551
from the signal handler */
2165
1552
/* Initialize the pseudo-RNG for Avahi */
2166
1553
srand((unsigned int) time(NULL));
2167
simple_poll = avahi_simple_poll_new();
2168
if(simple_poll == NULL){
2169
fprintf_plus(stderr,
2170
"Avahi: Failed to create simple poll object.\n");
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");
2171
1557
exitcode = EX_UNAVAILABLE;
2172
1558
goto end;
2173
1559
}
2235
1621
}
2236
1622
}
2237
1623
2238
/* If no interfaces were specified, make a list */
2239
if(mc.interfaces == NULL){
2240
struct dirent **direntries;
2241
/* Look for any good interfaces */
2242
ret = scandir(sys_class_net, &direntries, good_interface,
2243
alphasort);
2244
if(ret >= 1){
2245
/* Add all found interfaces to interfaces list */
2246
for(int i = 0; i < ret; ++i){
2247
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2248
direntries[i]->d_name);
2249
if(ret_errno != 0){
2250
errno = ret_errno;
2251
perror_plus("argz_add");
2252
continue;
2253
}
2254
if(debug){
2255
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2256
direntries[i]->d_name);
2257
}
2258
}
2259
free(direntries);
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");
1709
}
1710
}
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
break;
1729
}
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
}
2260
1760
} else {
2261
free(direntries);
2262
fprintf_plus(stderr, "Could not find a network interface\n");
2263
exitcode = EXIT_FAILURE;
2264
goto end;
2265
}
2266
}
2267
2268
/* Bring up interfaces which are down, and remove any "none"s */
2269
{
2270
char *interface = NULL;
2271
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2272
interface))){
2273
/* If interface name is "none", stop bringing up interfaces.
2274
Also remove all instances of "none" from the list */
2275
if(strcmp(interface, "none") == 0){
2276
argz_delete(&mc.interfaces, &mc.interfaces_size,
2277
interface);
2278
interface = NULL;
2279
while((interface = argz_next(mc.interfaces,
2280
mc.interfaces_size, interface))){
2281
if(strcmp(interface, "none") == 0){
2282
argz_delete(&mc.interfaces, &mc.interfaces_size,
2283
interface);
2284
interface = NULL;
2285
}
2286
}
2287
break;
2288
}
2289
bool interface_was_up = interface_is_up(interface);
2290
errno = bring_up_interface(interface, delay);
2291
if(not interface_was_up){
2292
if(errno != 0){
2293
perror_plus("Failed to bring up interface");
2294
} else {
2295
errno = argz_add(&interfaces_to_take_down,
2296
&interfaces_to_take_down_size,
2297
interface);
2298
if(errno != 0){
2299
perror_plus("argz_add");
2300
}
2301
}
2302
}
2303
}
2304
if(debug and (interfaces_to_take_down == NULL)){
2305
fprintf_plus(stderr, "No interfaces were brought up\n");
2306
}
2307
}
2308
2309
/* If we only got one interface, explicitly use only that one */
2310
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2311
if(debug){
2312
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2313
mc.interfaces);
2314
}
2315
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1761
/* Lower privileges permanently */
1762
ret = setuid(uid);
1763
if(ret == -1){
1764
perror_plus("setuid");
1765
}
1766
}
2316
1767
}
2317
1768
2318
1769
if(quit_now){
2319
1770
goto end;
2320
1771
}
2321
1772
2322
ret = init_gnutls_global(pubkey, seckey, &mc);
1773
ret = init_gnutls_global(pubkey, seckey);
2323
1774
if(ret == -1){
2324
fprintf_plus(stderr, "init_gnutls_global failed\n");
1775
fprintf(stderr, "init_gnutls_global failed\n");
2325
1776
exitcode = EX_UNAVAILABLE;
2326
1777
goto end;
2327
1778
} else {
2332
1783
goto end;
2333
1784
}
2334
1785
2335
/* Try /run/tmp before /tmp */
2336
tempdir = mkdtemp(run_tempdir);
2337
if(tempdir == NULL and errno == ENOENT){
2338
if(debug){
2339
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2340
run_tempdir, old_tempdir);
2341
}
2342
tempdir = mkdtemp(old_tempdir);
2343
}
2344
if(tempdir == NULL){
1786
if(mkdtemp(tempdir) == NULL){
2345
1787
perror_plus("mkdtemp");
2346
1788
goto end;
2347
1789
}
1790
tempdir_created = true;
2348
1791
2349
1792
if(quit_now){
2350
1793
goto end;
2351
1794
}
2352
1795
2353
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2354
fprintf_plus(stderr, "init_gpgme failed\n");
1796
if(not init_gpgme(pubkey, seckey, tempdir)){
1797
fprintf(stderr, "init_gpgme failed\n");
2355
1798
exitcode = EX_UNAVAILABLE;
2356
1799
goto end;
2357
1800
} else {
2366
1809
/* Connect directly, do not use Zeroconf */
2367
1810
/* (Mainly meant for debugging) */
2368
1811
char *address = strrchr(connect_to, ':');
2369
2370
1812
if(address == NULL){
2371
fprintf_plus(stderr, "No colon in address\n");
1813
fprintf(stderr, "No colon in address\n");
2372
1814
exitcode = EX_USAGE;
2373
1815
goto end;
2374
1816
}
2377
1819
goto end;
2378
1820
}
2379
1821
2380
in_port_t port;
1822
uint16_t port;
2381
1823
errno = 0;
2382
1824
tmpmax = strtoimax(address+1, &tmp, 10);
2383
1825
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2384
or tmpmax != (in_port_t)tmpmax){
2385
fprintf_plus(stderr, "Bad port number\n");
1826
or tmpmax != (uint16_t)tmpmax){
1827
fprintf(stderr, "Bad port number\n");
2386
1828
exitcode = EX_USAGE;
2387
1829
goto end;
2388
1830
}
2389
1831
2390
1832
if(quit_now){
2391
1833
goto end;
2392
1834
}
2393
1835
2394
port = (in_port_t)tmpmax;
1836
port = (uint16_t)tmpmax;
2395
1837
*address = '\0';
2396
1838
/* Colon in address indicates IPv6 */
2397
1839
int af;
2413
1855
}
2414
1856
2415
1857
while(not quit_now){
2416
ret = start_mandos_communication(address, port, if_index, af,
2417
&mc);
1858
ret = start_mandos_communication(address, port, if_index, af);
2418
1859
if(quit_now or ret == 0){
2419
1860
break;
2420
1861
}
2421
1862
if(debug){
2422
fprintf_plus(stderr, "Retrying in %d seconds\n",
2423
(int)retry_interval);
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
2424
1865
}
2425
sleep((unsigned int)retry_interval);
1866
sleep((int)retry_interval);
2426
1867
}
2427
1868
2428
if(not quit_now){
1869
if (not quit_now){
2429
1870
exitcode = EXIT_SUCCESS;
2430
1871
}
2431
1872
2432
1873
goto end;
2433
1874
}
2434
1875
2446
1887
config.publish_domain = 0;
2447
1888
2448
1889
/* Allocate a new server */
2449
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2450
&config, NULL, NULL, &ret_errno);
1890
mc.server = avahi_server_new(avahi_simple_poll_get
1891
(mc.simple_poll), &config, NULL,
1892
NULL, &error);
2451
1893
2452
1894
/* Free the Avahi configuration data */
2453
1895
avahi_server_config_free(&config);
2455
1897
2456
1898
/* Check if creating the Avahi server object succeeded */
2457
1899
if(mc.server == NULL){
2458
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2459
avahi_strerror(ret_errno));
1900
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
avahi_strerror(error));
2460
1902
exitcode = EX_UNAVAILABLE;
2461
1903
goto end;
2462
1904
}
2468
1910
/* Create the Avahi service browser */
2469
1911
sb = avahi_s_service_browser_new(mc.server, if_index,
2470
1912
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2471
NULL, 0, browse_callback,
2472
(void *)&mc);
1913
NULL, 0, browse_callback, NULL);
2473
1914
if(sb == NULL){
2474
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2475
avahi_strerror(avahi_server_errno(mc.server)));
1915
fprintf(stderr, "Failed to create service browser: %s\n",
1916
avahi_strerror(avahi_server_errno(mc.server)));
2476
1917
exitcode = EX_UNAVAILABLE;
2477
1918
goto end;
2478
1919
}
2484
1925
/* Run the main loop */
2485
1926
2486
1927
if(debug){
2487
fprintf_plus(stderr, "Starting Avahi loop search\n");
1928
fprintf(stderr, "Starting Avahi loop search\n");
2488
1929
}
2489
2490
ret = avahi_loop_with_timeout(simple_poll,
2491
(int)(retry_interval * 1000), &mc);
1930
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
(int)(retry_interval * 1000));
2492
1933
if(debug){
2493
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2494
(ret == 0) ? "successfully" : "with error");
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
2495
1936
}
2496
1937
2497
1938
end:
2498
1939
2499
1940
if(debug){
2500
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1941
fprintf(stderr, "%s exiting\n", argv[0]);
2501
1942
}
2502
1943
2503
1944
/* Cleanup things */
2504
free(mc.interfaces);
2505
2506
1945
if(sb != NULL)
2507
1946
avahi_s_service_browser_free(sb);
2508
1947
2509
1948
if(mc.server != NULL)
2510
1949
avahi_server_free(mc.server);
2511
1950
2512
if(simple_poll != NULL)
2513
avahi_simple_poll_free(simple_poll);
1951
if(mc.simple_poll != NULL)
1952
avahi_simple_poll_free(mc.simple_poll);
2514
1953
2515
1954
if(gnutls_initialized){
2516
1955
gnutls_certificate_free_credentials(mc.cred);
2521
1960
if(gpgme_initialized){
2522
1961
gpgme_release(mc.ctx);
2523
1962
}
2524
1963
2525
1964
/* Cleans up the circular linked list of Mandos servers the client
2526
1965
has seen */
2527
1966
if(mc.current_server != NULL){
2533
1972
}
2534
1973
}
2535
1974
2536
/* Re-raise privileges */
2537
{
2538
ret_errno = raise_privileges();
2539
if(ret_errno != 0){
2540
perror_plus("Failed to raise privileges");
2541
} else {
2542
2543
/* Run network hooks */
2544
run_network_hooks("stop", interfaces_hooks != NULL ?
2545
interfaces_hooks : "", delay);
2546
2547
/* Take down the network interfaces which were brought up */
2548
{
2549
char *interface = NULL;
2550
while((interface=argz_next(interfaces_to_take_down,
2551
interfaces_to_take_down_size,
2552
interface))){
2553
ret_errno = take_down_interface(interface);
2554
if(ret_errno != 0){
2555
errno = ret_errno;
2556
perror_plus("Failed to take down interface");
2557
}
2558
}
2559
if(debug and (interfaces_to_take_down == NULL)){
2560
fprintf_plus(stderr, "No interfaces needed to be taken"
2561
" down\n");
2562
}
2563
}
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");
2564
1982
}
2565
2566
ret_errno = lower_privileges_permanently();
2567
if(ret_errno != 0){
2568
perror_plus("Failed to lower privileges permanently");
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");
1992
}
1993
}
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");
2003
}
2569
2004
}
2570
2005
}
2571
2006
2572
free(interfaces_to_take_down);
2573
free(interfaces_hooks);
2574
2575
2007
/* Removes the GPGME temp directory and all files inside */
2576
if(tempdir != NULL){
2008
if(tempdir_created){
2577
2009
struct dirent **direntries = NULL;
2578
2010
struct dirent *direntry = NULL;
2579
2011
int numentries = scandir(tempdir, &direntries, notdotentries,
2580
2012
alphasort);
2581
if(numentries > 0){
2013
if (numentries > 0){
2582
2014
for(int i = 0; i < numentries; i++){
2583
2015
direntry = direntries[i];
2584
2016
char *fullname = NULL;
2590
2022
}
2591
2023
ret = remove(fullname);
2592
2024
if(ret == -1){
2593
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2594
strerror(errno));
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2026
strerror(errno));
2595
2027
}
2596
2028
free(fullname);
2597
2029
}
2598
2030
}
2599
2031
2600
2032
/* need to clean even if 0 because man page doesn't specify */
2601
2033
free(direntries);
2602
if(numentries == -1){
2034
if (numentries == -1){
2603
2035
perror_plus("scandir");
2604
2036
}
2605
2037
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0