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» Revision
237.7.239
(compared to revision 237.15.3)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2014-06-07 21:58:56 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 317.
- Revision ID: teddy@recompile.se-20140607215856-9q31dfsc68uuvzo4
Make mandos-client use scandirat() if it exists.
* plugins.d/mandos-client.d (hookdir_fd): File descriptor for hookdir.
(set_cloexec_flag): Define this function if O_CLOEXEC is undefined.
(run_network_hooks): Open hookdir_fd. Use scandirat() if it exists.
* plugins.d/mandos-client.d (hookdir_fd): File descriptor for hookdir.
(set_cloexec_flag): Define this function if O_CLOEXEC is undefined.
(run_network_hooks): Open hookdir_fd. Use scandirat() if it exists.
- files added:
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
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42
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#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
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#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
inet_pton(), connect() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
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() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
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() */
88
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89
98
#ifdef __linux__
90
99
#include <sys/klog.h> /* klogctl() */
108
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init_gnutls_session(),
109
118
GNUTLS_* */
110
119
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
113
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/* GPGME */
115
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#include <gpgme.h> /* All GPGME types, constants and
131
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
132
141
static const char sys_class_net[] = "/sys/class/net";
133
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
int hookdir_fd = -1;
145
uid_t uid = 65534;
146
gid_t gid = 65534;
134
147
135
148
/* Doubly linked list that need to be circularly linked when used */
136
149
typedef struct server{
137
150
const char *ip;
138
uint16_t port;
151
in_port_t port;
139
152
AvahiIfIndex if_index;
140
153
int af;
141
154
struct timespec last_seen;
145
158
146
159
/* Used for passing in values through the Avahi callback functions */
147
160
typedef struct {
148
AvahiSimplePoll *simple_poll;
149
161
AvahiServer *server;
150
162
gnutls_certificate_credentials_t cred;
151
163
unsigned int dh_bits;
153
165
const char *priority;
154
166
gpgme_ctx_t ctx;
155
167
server *current_server;
168
char *interfaces;
169
size_t interfaces_size;
156
170
} mandos_context;
157
171
158
/* global context so signal handler can reach it*/
159
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
172
/* global so signal handler can reach it*/
173
AvahiSimplePoll *simple_poll;
163
174
164
175
sig_atomic_t quit_now = 0;
165
176
int signal_received = 0;
166
177
167
178
/* Function to use when printing errors */
168
179
void perror_plus(const char *print_text){
180
int e = errno;
169
181
fprintf(stderr, "Mandos plugin %s: ",
170
182
program_invocation_short_name);
183
errno = e;
171
184
perror(print_text);
172
185
}
173
186
187
__attribute__((format (gnu_printf, 2, 3), nonnull))
188
int fprintf_plus(FILE *stream, const char *format, ...){
189
va_list ap;
190
va_start (ap, format);
191
192
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
193
program_invocation_short_name));
194
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
}
196
174
197
/*
175
198
* Make additional room in "buffer" for at least BUFFER_SIZE more
176
199
* bytes. "buffer_capacity" is how much is currently allocated,
177
200
* "buffer_length" is how much is already used.
178
201
*/
202
__attribute__((nonnull, warn_unused_result))
179
203
size_t incbuffer(char **buffer, size_t buffer_length,
180
size_t buffer_capacity){
204
size_t buffer_capacity){
181
205
if(buffer_length + BUFFER_SIZE > buffer_capacity){
182
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
183
if(buffer == NULL){
206
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
207
if(new_buf == NULL){
208
int old_errno = errno;
209
free(*buffer);
210
errno = old_errno;
211
*buffer = NULL;
184
212
return 0;
185
213
}
214
*buffer = new_buf;
186
215
buffer_capacity += BUFFER_SIZE;
187
216
}
188
217
return buffer_capacity;
189
218
}
190
219
191
220
/* Add server to set of servers to retry periodically */
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
194
int af){
221
__attribute__((nonnull, warn_unused_result))
222
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
223
int af, server **current_server){
195
224
int ret;
196
225
server *new_server = malloc(sizeof(server));
197
226
if(new_server == NULL){
198
227
perror_plus("malloc");
199
return -1;
228
return false;
200
229
}
201
230
*new_server = (server){ .ip = strdup(ip),
202
.port = port,
203
.if_index = if_index,
204
.af = af };
231
.port = port,
232
.if_index = if_index,
233
.af = af };
205
234
if(new_server->ip == NULL){
206
235
perror_plus("strdup");
207
return -1;
236
return false;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
208
242
}
209
243
/* Special case of first server */
210
if (mc.current_server == NULL){
244
if(*current_server == NULL){
211
245
new_server->next = new_server;
212
246
new_server->prev = new_server;
213
mc.current_server = new_server;
214
/* Place the new server last in the list */
247
*current_server = new_server;
215
248
} else {
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
249
/* Place the new server last in the list */
250
new_server->next = *current_server;
251
new_server->prev = (*current_server)->prev;
218
252
new_server->prev->next = new_server;
219
mc.current_server->prev = new_server;
220
}
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
222
if(ret == -1){
223
perror_plus("clock_gettime");
224
return -1;
225
}
226
return 0;
253
(*current_server)->prev = new_server;
254
}
255
return true;
227
256
}
228
257
229
258
/*
230
259
* Initialize GPGME.
231
260
*/
232
static bool init_gpgme(const char *seckey,
233
const char *pubkey, const char *tempdir){
261
__attribute__((nonnull, warn_unused_result))
262
static bool init_gpgme(const char * const seckey,
263
const char * const pubkey,
264
const char * const tempdir,
265
mandos_context *mc){
234
266
gpgme_error_t rc;
235
267
gpgme_engine_info_t engine_info;
236
268
237
238
269
/*
239
270
* Helper function to insert pub and seckey to the engine keyring.
240
271
*/
241
bool import_key(const char *filename){
272
bool import_key(const char * const filename){
242
273
int ret;
243
274
int fd;
244
275
gpgme_data_t pgp_data;
251
282
252
283
rc = gpgme_data_new_from_fd(&pgp_data, fd);
253
284
if(rc != GPG_ERR_NO_ERROR){
254
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
255
gpgme_strsource(rc), gpgme_strerror(rc));
285
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
256
287
return false;
257
288
}
258
289
259
rc = gpgme_op_import(mc.ctx, pgp_data);
290
rc = gpgme_op_import(mc->ctx, pgp_data);
260
291
if(rc != GPG_ERR_NO_ERROR){
261
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
262
gpgme_strsource(rc), gpgme_strerror(rc));
292
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
293
gpgme_strsource(rc), gpgme_strerror(rc));
263
294
return false;
264
295
}
265
296
272
303
}
273
304
274
305
if(debug){
275
fprintf(stderr, "Initializing GPGME\n");
306
fprintf_plus(stderr, "Initializing GPGME\n");
276
307
}
277
308
278
309
/* Init GPGME */
279
310
gpgme_check_version(NULL);
280
311
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
281
312
if(rc != GPG_ERR_NO_ERROR){
282
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
313
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
314
gpgme_strsource(rc), gpgme_strerror(rc));
284
315
return false;
285
316
}
286
317
287
318
/* Set GPGME home directory for the OpenPGP engine only */
288
319
rc = gpgme_get_engine_info(&engine_info);
289
320
if(rc != GPG_ERR_NO_ERROR){
290
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
321
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
322
gpgme_strsource(rc), gpgme_strerror(rc));
292
323
return false;
293
324
}
294
325
while(engine_info != NULL){
300
331
engine_info = engine_info->next;
301
332
}
302
333
if(engine_info == NULL){
303
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
334
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
335
tempdir);
304
336
return false;
305
337
}
306
338
307
339
/* Create new GPGME "context" */
308
rc = gpgme_new(&(mc.ctx));
340
rc = gpgme_new(&(mc->ctx));
309
341
if(rc != GPG_ERR_NO_ERROR){
310
fprintf(stderr, "bad gpgme_new: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
342
fprintf_plus(stderr, "Mandos plugin mandos-client: "
343
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
344
gpgme_strerror(rc));
312
345
return false;
313
346
}
314
347
323
356
* Decrypt OpenPGP data.
324
357
* Returns -1 on error
325
358
*/
359
__attribute__((nonnull, warn_unused_result))
326
360
static ssize_t pgp_packet_decrypt(const char *cryptotext,
327
361
size_t crypto_size,
328
char **plaintext){
362
char **plaintext,
363
mandos_context *mc){
329
364
gpgme_data_t dh_crypto, dh_plain;
330
365
gpgme_error_t rc;
331
366
ssize_t ret;
333
368
ssize_t plaintext_length = 0;
334
369
335
370
if(debug){
336
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
371
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
337
372
}
338
373
339
374
/* Create new GPGME data buffer from memory cryptotext */
340
375
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
341
376
0);
342
377
if(rc != GPG_ERR_NO_ERROR){
343
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
344
gpgme_strsource(rc), gpgme_strerror(rc));
378
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
379
gpgme_strsource(rc), gpgme_strerror(rc));
345
380
return -1;
346
381
}
347
382
348
383
/* Create new empty GPGME data buffer for the plaintext */
349
384
rc = gpgme_data_new(&dh_plain);
350
385
if(rc != GPG_ERR_NO_ERROR){
351
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
386
fprintf_plus(stderr, "Mandos plugin mandos-client: "
387
"bad gpgme_data_new: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
353
389
gpgme_data_release(dh_crypto);
354
390
return -1;
355
391
}
356
392
357
393
/* Decrypt data from the cryptotext data buffer to the plaintext
358
394
data buffer */
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
395
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
360
396
if(rc != GPG_ERR_NO_ERROR){
361
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
398
gpgme_strsource(rc), gpgme_strerror(rc));
363
399
plaintext_length = -1;
364
400
if(debug){
365
401
gpgme_decrypt_result_t result;
366
result = gpgme_op_decrypt_result(mc.ctx);
402
result = gpgme_op_decrypt_result(mc->ctx);
367
403
if(result == NULL){
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
404
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
369
405
} else {
370
fprintf(stderr, "Unsupported algorithm: %s\n",
371
result->unsupported_algorithm);
372
fprintf(stderr, "Wrong key usage: %u\n",
373
result->wrong_key_usage);
406
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
407
result->unsupported_algorithm);
408
fprintf_plus(stderr, "Wrong key usage: %u\n",
409
result->wrong_key_usage);
374
410
if(result->file_name != NULL){
375
fprintf(stderr, "File name: %s\n", result->file_name);
411
fprintf_plus(stderr, "File name: %s\n", result->file_name);
376
412
}
377
413
gpgme_recipient_t recipient;
378
414
recipient = result->recipients;
379
415
while(recipient != NULL){
380
fprintf(stderr, "Public key algorithm: %s\n",
381
gpgme_pubkey_algo_name(recipient->pubkey_algo));
382
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
383
fprintf(stderr, "Secret key available: %s\n",
384
recipient->status == GPG_ERR_NO_SECKEY
385
? "No" : "Yes");
416
fprintf_plus(stderr, "Public key algorithm: %s\n",
417
gpgme_pubkey_algo_name
418
(recipient->pubkey_algo));
419
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
420
fprintf_plus(stderr, "Secret key available: %s\n",
421
recipient->status == GPG_ERR_NO_SECKEY
422
? "No" : "Yes");
386
423
recipient = recipient->next;
387
424
}
388
425
}
391
428
}
392
429
393
430
if(debug){
394
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
431
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
395
432
}
396
433
397
434
/* Seek back to the beginning of the GPGME plaintext data buffer */
404
441
*plaintext = NULL;
405
442
while(true){
406
443
plaintext_capacity = incbuffer(plaintext,
407
(size_t)plaintext_length,
408
plaintext_capacity);
444
(size_t)plaintext_length,
445
plaintext_capacity);
409
446
if(plaintext_capacity == 0){
410
perror_plus("incbuffer");
411
plaintext_length = -1;
412
goto decrypt_end;
447
perror_plus("incbuffer");
448
plaintext_length = -1;
449
goto decrypt_end;
413
450
}
414
451
415
452
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
428
465
}
429
466
430
467
if(debug){
431
fprintf(stderr, "Decrypted password is: ");
468
fprintf_plus(stderr, "Decrypted password is: ");
432
469
for(ssize_t i = 0; i < plaintext_length; i++){
433
470
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
434
471
}
445
482
return plaintext_length;
446
483
}
447
484
448
static const char * safer_gnutls_strerror(int value){
449
const char *ret = gnutls_strerror(value); /* Spurious warning from
450
-Wunreachable-code */
485
__attribute__((warn_unused_result))
486
static const char *safer_gnutls_strerror(int value){
487
const char *ret = gnutls_strerror(value);
451
488
if(ret == NULL)
452
489
ret = "(unknown)";
453
490
return ret;
454
491
}
455
492
456
493
/* GnuTLS log function callback */
494
__attribute__((nonnull))
457
495
static void debuggnutls(__attribute__((unused)) int level,
458
496
const char* string){
459
fprintf(stderr, "GnuTLS: %s", string);
497
fprintf_plus(stderr, "GnuTLS: %s", string);
460
498
}
461
499
500
__attribute__((nonnull, warn_unused_result))
462
501
static int init_gnutls_global(const char *pubkeyfilename,
463
const char *seckeyfilename){
502
const char *seckeyfilename,
503
mandos_context *mc){
464
504
int ret;
465
505
466
506
if(debug){
467
fprintf(stderr, "Initializing GnuTLS\n");
507
fprintf_plus(stderr, "Initializing GnuTLS\n");
468
508
}
469
509
470
510
ret = gnutls_global_init();
471
511
if(ret != GNUTLS_E_SUCCESS){
472
fprintf(stderr, "GnuTLS global_init: %s\n",
473
safer_gnutls_strerror(ret));
512
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
513
safer_gnutls_strerror(ret));
474
514
return -1;
475
515
}
476
516
483
523
}
484
524
485
525
/* OpenPGP credentials */
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
526
ret = gnutls_certificate_allocate_credentials(&mc->cred);
487
527
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "GnuTLS memory error: %s\n",
489
safer_gnutls_strerror(ret));
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
529
safer_gnutls_strerror(ret));
490
530
gnutls_global_deinit();
491
531
return -1;
492
532
}
493
533
494
534
if(debug){
495
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
496
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
497
seckeyfilename);
535
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
536
" secret key %s as GnuTLS credentials\n",
537
pubkeyfilename,
538
seckeyfilename);
498
539
}
499
540
500
541
ret = gnutls_certificate_set_openpgp_key_file
501
(mc.cred, pubkeyfilename, seckeyfilename,
542
(mc->cred, pubkeyfilename, seckeyfilename,
502
543
GNUTLS_OPENPGP_FMT_BASE64);
503
544
if(ret != GNUTLS_E_SUCCESS){
504
fprintf(stderr,
505
"Error[%d] while reading the OpenPGP key pair ('%s',"
506
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
507
fprintf(stderr, "The GnuTLS error is: %s\n",
508
safer_gnutls_strerror(ret));
545
fprintf_plus(stderr,
546
"Error[%d] while reading the OpenPGP key pair ('%s',"
547
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
548
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
549
safer_gnutls_strerror(ret));
509
550
goto globalfail;
510
551
}
511
552
512
553
/* GnuTLS server initialization */
513
ret = gnutls_dh_params_init(&mc.dh_params);
554
ret = gnutls_dh_params_init(&mc->dh_params);
514
555
if(ret != GNUTLS_E_SUCCESS){
515
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
516
" %s\n", safer_gnutls_strerror(ret));
556
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
557
" initialization: %s\n",
558
safer_gnutls_strerror(ret));
517
559
goto globalfail;
518
560
}
519
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
561
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
520
562
if(ret != GNUTLS_E_SUCCESS){
521
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
522
safer_gnutls_strerror(ret));
563
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
564
safer_gnutls_strerror(ret));
523
565
goto globalfail;
524
566
}
525
567
526
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
568
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
527
569
528
570
return 0;
529
571
530
572
globalfail:
531
573
532
gnutls_certificate_free_credentials(mc.cred);
574
gnutls_certificate_free_credentials(mc->cred);
533
575
gnutls_global_deinit();
534
gnutls_dh_params_deinit(mc.dh_params);
576
gnutls_dh_params_deinit(mc->dh_params);
535
577
return -1;
536
578
}
537
579
538
static int init_gnutls_session(gnutls_session_t *session){
580
__attribute__((nonnull, warn_unused_result))
581
static int init_gnutls_session(gnutls_session_t *session,
582
mandos_context *mc){
539
583
int ret;
540
584
/* GnuTLS session creation */
541
585
do {
545
589
}
546
590
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
547
591
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
549
safer_gnutls_strerror(ret));
592
fprintf_plus(stderr,
593
"Error in GnuTLS session initialization: %s\n",
594
safer_gnutls_strerror(ret));
550
595
}
551
596
552
597
{
553
598
const char *err;
554
599
do {
555
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
600
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
556
601
if(quit_now){
557
602
gnutls_deinit(*session);
558
603
return -1;
559
604
}
560
605
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
561
606
if(ret != GNUTLS_E_SUCCESS){
562
fprintf(stderr, "Syntax error at: %s\n", err);
563
fprintf(stderr, "GnuTLS error: %s\n",
564
safer_gnutls_strerror(ret));
607
fprintf_plus(stderr, "Syntax error at: %s\n", err);
608
fprintf_plus(stderr, "GnuTLS error: %s\n",
609
safer_gnutls_strerror(ret));
565
610
gnutls_deinit(*session);
566
611
return -1;
567
612
}
569
614
570
615
do {
571
616
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
572
mc.cred);
617
mc->cred);
573
618
if(quit_now){
574
619
gnutls_deinit(*session);
575
620
return -1;
576
621
}
577
622
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
578
623
if(ret != GNUTLS_E_SUCCESS){
579
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
580
safer_gnutls_strerror(ret));
624
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
625
safer_gnutls_strerror(ret));
581
626
gnutls_deinit(*session);
582
627
return -1;
583
628
}
585
630
/* ignore client certificate if any. */
586
631
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
587
632
588
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
633
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
589
634
590
635
return 0;
591
636
}
595
640
__attribute__((unused)) const char *txt){}
596
641
597
642
/* Called when a Mandos server is found */
598
static int start_mandos_communication(const char *ip, uint16_t port,
643
__attribute__((nonnull, warn_unused_result))
644
static int start_mandos_communication(const char *ip, in_port_t port,
599
645
AvahiIfIndex if_index,
600
int af){
646
int af, mandos_context *mc){
601
647
int ret, tcp_sd = -1;
602
648
ssize_t sret;
603
union {
604
struct sockaddr_in in;
605
struct sockaddr_in6 in6;
606
} to;
649
struct sockaddr_storage to;
607
650
char *buffer = NULL;
608
651
char *decrypted_buffer = NULL;
609
652
size_t buffer_length = 0;
628
671
pf = PF_INET;
629
672
break;
630
673
default:
631
fprintf(stderr, "Bad address family: %d\n", af);
674
fprintf_plus(stderr, "Bad address family: %d\n", af);
632
675
errno = EINVAL;
633
676
return -1;
634
677
}
635
678
636
ret = init_gnutls_session(&session);
679
/* If the interface is specified and we have a list of interfaces */
680
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
681
/* Check if the interface is one of the interfaces we are using */
682
bool match = false;
683
{
684
char *interface = NULL;
685
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
686
interface))){
687
if(if_nametoindex(interface) == (unsigned int)if_index){
688
match = true;
689
break;
690
}
691
}
692
}
693
if(not match){
694
/* This interface does not match any in the list, so we don't
695
connect to the server */
696
if(debug){
697
char interface[IF_NAMESIZE];
698
if(if_indextoname((unsigned int)if_index, interface) == NULL){
699
perror_plus("if_indextoname");
700
} else {
701
fprintf_plus(stderr, "Skipping server on non-used interface"
702
" \"%s\"\n",
703
if_indextoname((unsigned int)if_index,
704
interface));
705
}
706
}
707
return -1;
708
}
709
}
710
711
ret = init_gnutls_session(&session, mc);
637
712
if(ret != 0){
638
713
return -1;
639
714
}
640
715
641
716
if(debug){
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
643
"\n", ip, port);
717
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
718
PRIuMAX "\n", ip, (uintmax_t)port);
644
719
}
645
720
646
721
tcp_sd = socket(pf, SOCK_STREAM, 0);
658
733
659
734
memset(&to, 0, sizeof(to));
660
735
if(af == AF_INET6){
661
to.in6.sin6_family = (sa_family_t)af;
662
ret = inet_pton(af, ip, &to.in6.sin6_addr);
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
663
738
} else { /* IPv4 */
664
to.in.sin_family = (sa_family_t)af;
665
ret = inet_pton(af, ip, &to.in.sin_addr);
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
666
741
}
667
742
if(ret < 0 ){
668
743
int e = errno;
672
747
}
673
748
if(ret == 0){
674
749
int e = errno;
675
fprintf(stderr, "Bad address: %s\n", ip);
750
fprintf_plus(stderr, "Bad address: %s\n", ip);
676
751
errno = e;
677
752
goto mandos_end;
678
753
}
679
754
if(af == AF_INET6){
680
to.in6.sin6_port = htons(port); /* Spurious warnings from
681
-Wconversion and
682
-Wunreachable-code */
683
684
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
685
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
686
-Wunreachable-code*/
755
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
756
if(IN6_IS_ADDR_LINKLOCAL
757
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
687
758
if(if_index == AVAHI_IF_UNSPEC){
688
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
" without a network interface\n");
759
fprintf_plus(stderr, "An IPv6 link-local address is"
760
" incomplete without a network interface\n");
690
761
errno = EINVAL;
691
762
goto mandos_end;
692
763
}
693
764
/* Set the network interface number as scope */
694
to.in6.sin6_scope_id = (uint32_t)if_index;
765
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
695
766
}
696
767
} else {
697
to.in.sin_port = htons(port); /* Spurious warnings from
698
-Wconversion and
699
-Wunreachable-code */
768
((struct sockaddr_in *)&to)->sin_port = htons(port);
700
769
}
701
770
702
771
if(quit_now){
710
779
if(if_indextoname((unsigned int)if_index, interface) == NULL){
711
780
perror_plus("if_indextoname");
712
781
} else {
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
782
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
783
"\n", ip, interface, (uintmax_t)port);
715
784
}
716
785
} else {
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
718
port);
786
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
787
ip, (uintmax_t)port);
719
788
}
720
789
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
721
790
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
722
const char *pcret;
723
791
if(af == AF_INET6){
724
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
725
sizeof(addrstr));
792
ret = getnameinfo((struct sockaddr *)&to,
793
sizeof(struct sockaddr_in6),
794
addrstr, sizeof(addrstr), NULL, 0,
795
NI_NUMERICHOST);
726
796
} else {
727
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
728
sizeof(addrstr));
797
ret = getnameinfo((struct sockaddr *)&to,
798
sizeof(struct sockaddr_in),
799
addrstr, sizeof(addrstr), NULL, 0,
800
NI_NUMERICHOST);
729
801
}
730
if(pcret == NULL){
731
perror_plus("inet_ntop");
732
} else {
733
if(strcmp(addrstr, ip) != 0){
734
fprintf(stderr, "Canonical address form: %s\n", addrstr);
735
}
802
if(ret == EAI_SYSTEM){
803
perror_plus("getnameinfo");
804
} else if(ret != 0) {
805
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
806
} else if(strcmp(addrstr, ip) != 0){
807
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
736
808
}
737
809
}
738
810
742
814
}
743
815
744
816
if(af == AF_INET6){
745
ret = connect(tcp_sd, &to.in6, sizeof(to));
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
746
819
} else {
747
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
748
822
}
749
823
if(ret < 0){
750
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
751
825
int e = errno;
752
826
perror_plus("connect");
753
827
errno = e;
765
839
while(true){
766
840
size_t out_size = strlen(out);
767
841
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
768
out_size - written));
842
out_size - written));
769
843
if(ret == -1){
770
844
int e = errno;
771
845
perror_plus("write");
791
865
}
792
866
793
867
if(debug){
794
fprintf(stderr, "Establishing TLS session with %s\n", ip);
868
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
795
869
}
796
870
797
871
if(quit_now){
799
873
goto mandos_end;
800
874
}
801
875
802
/* Spurious warning from -Wint-to-pointer-cast */
803
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
876
/* This casting via intptr_t is to eliminate warning about casting
877
an int to a pointer type. This is exactly how the GnuTLS Guile
878
function "set-session-transport-fd!" does it. */
879
gnutls_transport_set_ptr(session,
880
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
804
881
805
882
if(quit_now){
806
883
errno = EINTR;
817
894
818
895
if(ret != GNUTLS_E_SUCCESS){
819
896
if(debug){
820
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
897
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
821
898
gnutls_perror(ret);
822
899
}
823
900
errno = EPROTO;
827
904
/* Read OpenPGP packet that contains the wanted password */
828
905
829
906
if(debug){
830
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
831
ip);
907
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
908
" %s\n", ip);
832
909
}
833
910
834
911
while(true){
839
916
}
840
917
841
918
buffer_capacity = incbuffer(&buffer, buffer_length,
842
buffer_capacity);
919
buffer_capacity);
843
920
if(buffer_capacity == 0){
844
921
int e = errno;
845
922
perror_plus("incbuffer");
872
949
}
873
950
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
874
951
if(ret < 0){
875
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
952
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
953
"***\n");
876
954
gnutls_perror(ret);
877
955
errno = EPROTO;
878
956
goto mandos_end;
879
957
}
880
958
break;
881
959
default:
882
fprintf(stderr, "Unknown error while reading data from"
883
" encrypted session with Mandos server\n");
960
fprintf_plus(stderr, "Unknown error while reading data from"
961
" encrypted session with Mandos server\n");
884
962
gnutls_bye(session, GNUTLS_SHUT_RDWR);
885
963
errno = EIO;
886
964
goto mandos_end;
891
969
}
892
970
893
971
if(debug){
894
fprintf(stderr, "Closing TLS session\n");
972
fprintf_plus(stderr, "Closing TLS session\n");
895
973
}
896
974
897
975
if(quit_now){
909
987
910
988
if(buffer_length > 0){
911
989
ssize_t decrypted_buffer_size;
912
decrypted_buffer_size = pgp_packet_decrypt(buffer,
913
buffer_length,
914
&decrypted_buffer);
990
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
991
&decrypted_buffer, mc);
915
992
if(decrypted_buffer_size >= 0){
916
993
917
994
written = 0;
927
1004
if(ret == 0 and ferror(stdout)){
928
1005
int e = errno;
929
1006
if(debug){
930
fprintf(stderr, "Error writing encrypted data: %s\n",
931
strerror(errno));
1007
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1008
strerror(errno));
932
1009
}
933
1010
errno = e;
934
1011
goto mandos_end;
965
1042
return retval;
966
1043
}
967
1044
1045
__attribute__((nonnull))
968
1046
static void resolve_callback(AvahiSServiceResolver *r,
969
1047
AvahiIfIndex interface,
970
1048
AvahiProtocol proto,
978
1056
AVAHI_GCC_UNUSED AvahiStringList *txt,
979
1057
AVAHI_GCC_UNUSED AvahiLookupResultFlags
980
1058
flags,
981
AVAHI_GCC_UNUSED void* userdata){
982
assert(r);
1059
void *mc){
1060
if(r == NULL){
1061
return;
1062
}
983
1063
984
1064
/* Called whenever a service has been resolved successfully or
985
1065
timed out */
991
1071
switch(event){
992
1072
default:
993
1073
case AVAHI_RESOLVER_FAILURE:
994
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
995
" of type '%s' in domain '%s': %s\n", name, type, domain,
996
avahi_strerror(avahi_server_errno(mc.server)));
1074
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1075
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1076
domain,
1077
avahi_strerror(avahi_server_errno
1078
(((mandos_context*)mc)->server)));
997
1079
break;
998
1080
999
1081
case AVAHI_RESOLVER_FOUND:
1001
1083
char ip[AVAHI_ADDRESS_STR_MAX];
1002
1084
avahi_address_snprint(ip, sizeof(ip), address);
1003
1085
if(debug){
1004
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1005
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1006
ip, (intmax_t)interface, port);
1086
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1087
PRIdMAX ") on port %" PRIu16 "\n", name,
1088
host_name, ip, (intmax_t)interface, port);
1007
1089
}
1008
int ret = start_mandos_communication(ip, port, interface,
1009
avahi_proto_to_af(proto));
1090
int ret = start_mandos_communication(ip, (in_port_t)port,
1091
interface,
1092
avahi_proto_to_af(proto),
1093
mc);
1010
1094
if(ret == 0){
1011
avahi_simple_poll_quit(mc.simple_poll);
1095
avahi_simple_poll_quit(simple_poll);
1012
1096
} else {
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1097
if(not add_server(ip, (in_port_t)port, interface,
1098
avahi_proto_to_af(proto),
1099
&((mandos_context*)mc)->current_server)){
1100
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1101
" list\n", name);
1102
}
1015
1103
}
1016
1104
}
1017
1105
}
1027
1115
const char *domain,
1028
1116
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1029
1117
flags,
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(b);
1118
void *mc){
1119
if(b == NULL){
1120
return;
1121
}
1032
1122
1033
1123
/* Called whenever a new services becomes available on the LAN or
1034
1124
is removed from the LAN */
1041
1131
default:
1042
1132
case AVAHI_BROWSER_FAILURE:
1043
1133
1044
fprintf(stderr, "(Avahi browser) %s\n",
1045
avahi_strerror(avahi_server_errno(mc.server)));
1046
avahi_simple_poll_quit(mc.simple_poll);
1134
fprintf_plus(stderr, "(Avahi browser) %s\n",
1135
avahi_strerror(avahi_server_errno
1136
(((mandos_context*)mc)->server)));
1137
avahi_simple_poll_quit(simple_poll);
1047
1138
return;
1048
1139
1049
1140
case AVAHI_BROWSER_NEW:
1052
1143
the callback function is called the Avahi server will free the
1053
1144
resolver for us. */
1054
1145
1055
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1056
name, type, domain, protocol, 0,
1057
resolve_callback, NULL) == NULL)
1058
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1059
name, avahi_strerror(avahi_server_errno(mc.server)));
1146
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1147
interface, protocol, name, type,
1148
domain, protocol, 0,
1149
resolve_callback, mc) == NULL)
1150
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1151
" %s\n", name,
1152
avahi_strerror(avahi_server_errno
1153
(((mandos_context*)mc)->server)));
1060
1154
break;
1061
1155
1062
1156
case AVAHI_BROWSER_REMOVE:
1065
1159
case AVAHI_BROWSER_ALL_FOR_NOW:
1066
1160
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1067
1161
if(debug){
1068
fprintf(stderr, "No Mandos server found, still searching...\n");
1162
fprintf_plus(stderr, "No Mandos server found, still"
1163
" searching...\n");
1069
1164
}
1070
1165
break;
1071
1166
}
1080
1175
signal_received = sig;
1081
1176
int old_errno = errno;
1082
1177
/* set main loop to exit */
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1178
if(simple_poll != NULL){
1179
avahi_simple_poll_quit(simple_poll);
1085
1180
}
1086
1181
errno = old_errno;
1087
1182
}
1088
1183
1184
__attribute__((nonnull, warn_unused_result))
1089
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1090
1186
int ret;
1187
error_t ret_errno;
1091
1188
1092
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1093
1190
if(s < 0){
1191
ret_errno = errno;
1094
1192
perror_plus("socket");
1193
errno = ret_errno;
1095
1194
return false;
1096
1195
}
1097
1196
strcpy(ifr->ifr_name, ifname);
1098
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1099
1198
if(ret == -1){
1100
1199
if(debug){
1200
ret_errno = errno;
1101
1201
perror_plus("ioctl SIOCGIFFLAGS");
1202
errno = ret_errno;
1102
1203
}
1103
1204
return false;
1104
1205
}
1105
1206
return true;
1106
1207
}
1107
1208
1209
__attribute__((nonnull, warn_unused_result))
1108
1210
bool good_flags(const char *ifname, const struct ifreq *ifr){
1109
1211
1110
1212
/* Reject the loopback device */
1111
1213
if(ifr->ifr_flags & IFF_LOOPBACK){
1112
1214
if(debug){
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1215
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1216
ifname);
1115
1217
}
1116
1218
return false;
1117
1219
}
1118
1220
/* Accept point-to-point devices only if connect_to is specified */
1119
1221
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1120
1222
if(debug){
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1223
fprintf_plus(stderr, "Accepting point-to-point interface"
1224
" \"%s\"\n", ifname);
1123
1225
}
1124
1226
return true;
1125
1227
}
1126
1228
/* Otherwise, reject non-broadcast-capable devices */
1127
1229
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1128
1230
if(debug){
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1231
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1232
" \"%s\"\n", ifname);
1131
1233
}
1132
1234
return false;
1133
1235
}
1134
1236
/* Reject non-ARP interfaces (including dummy interfaces) */
1135
1237
if(ifr->ifr_flags & IFF_NOARP){
1136
1238
if(debug){
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1239
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1240
ifname);
1138
1241
}
1139
1242
return false;
1140
1243
}
1141
1244
1142
1245
/* Accept this device */
1143
1246
if(debug){
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1247
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1145
1248
}
1146
1249
return true;
1147
1250
}
1151
1254
* corresponds to an acceptable network device.
1152
1255
* (This function is passed to scandir(3) as a filter function.)
1153
1256
*/
1257
__attribute__((nonnull, warn_unused_result))
1154
1258
int good_interface(const struct dirent *if_entry){
1155
int ret;
1156
1259
if(if_entry->d_name[0] == '.'){
1157
1260
return 0;
1158
1261
}
1262
1159
1263
struct ifreq ifr;
1160
1161
1264
if(not get_flags(if_entry->d_name, &ifr)){
1265
if(debug){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", if_entry->d_name);
1268
}
1162
1269
return 0;
1163
1270
}
1164
1271
1169
1276
}
1170
1277
1171
1278
/*
1172
* This function determines if a directory entry in /sys/class/net
1173
* corresponds to an acceptable network device which is up.
1174
* (This function is passed to scandir(3) as a filter function.)
1175
*/
1176
int up_interface(const struct dirent *if_entry){
1177
ssize_t ssret;
1178
char *flagname = NULL;
1179
if(if_entry->d_name[0] == '.'){
1180
return 0;
1181
}
1182
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1183
if_entry->d_name);
1184
if(ret < 0){
1185
perror_plus("asprintf");
1186
return 0;
1187
}
1188
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1189
if(flags_fd == -1){
1190
perror_plus("open");
1191
free(flagname);
1192
return 0;
1193
}
1194
free(flagname);
1195
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1196
/* read line from flags_fd */
1197
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1198
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1199
flagstring[(size_t)to_read] = '\0';
1200
if(flagstring == NULL){
1201
perror_plus("malloc");
1202
close(flags_fd);
1203
return 0;
1204
}
1205
while(to_read > 0){
1206
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1207
(size_t)to_read));
1208
if(ssret == -1){
1209
perror_plus("read");
1210
free(flagstring);
1211
close(flags_fd);
1212
return 0;
1213
}
1214
to_read -= ssret;
1215
if(ssret == 0){
1216
break;
1217
}
1218
}
1219
close(flags_fd);
1220
intmax_t tmpmax;
1221
char *tmp;
1222
errno = 0;
1223
tmpmax = strtoimax(flagstring, &tmp, 0);
1224
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1225
and not (isspace(*tmp)))
1226
or tmpmax != (ifreq_flags)tmpmax){
1227
if(debug){
1228
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1229
flagstring, if_entry->d_name);
1230
}
1231
free(flagstring);
1232
return 0;
1233
}
1234
free(flagstring);
1235
ifreq_flags flags = (ifreq_flags)tmpmax;
1236
/* Reject the loopback device */
1237
if(flags & IFF_LOOPBACK){
1238
if(debug){
1239
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
/* Reject down interfaces */
1246
if(not (flags & IFF_UP)){
1247
return 0;
1248
}
1249
1250
/* Accept point-to-point devices only if connect_to is specified */
1251
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1252
if(debug){
1253
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1254
if_entry->d_name);
1255
}
1256
return 1;
1257
}
1258
/* Otherwise, reject non-broadcast-capable devices */
1259
if(not (flags & IFF_BROADCAST)){
1260
if(debug){
1261
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1262
if_entry->d_name);
1263
}
1264
return 0;
1265
}
1266
/* Reject non-ARP interfaces (including dummy interfaces) */
1267
if(flags & IFF_NOARP){
1268
if(debug){
1269
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1270
if_entry->d_name);
1271
}
1272
return 0;
1273
}
1274
/* Accept this device */
1275
if(debug){
1276
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1277
if_entry->d_name);
1278
}
1279
return 1;
1280
}
1281
1279
* This function determines if a network interface is up.
1280
*/
1281
__attribute__((nonnull, warn_unused_result))
1282
bool interface_is_up(const char *interface){
1283
struct ifreq ifr;
1284
if(not get_flags(interface, &ifr)){
1285
if(debug){
1286
fprintf_plus(stderr, "Failed to get flags for interface "
1287
"\"%s\"\n", interface);
1288
}
1289
return false;
1290
}
1291
1292
return (bool)(ifr.ifr_flags & IFF_UP);
1293
}
1294
1295
/*
1296
* This function determines if a network interface is running
1297
*/
1298
__attribute__((nonnull, warn_unused_result))
1299
bool interface_is_running(const char *interface){
1300
struct ifreq ifr;
1301
if(not get_flags(interface, &ifr)){
1302
if(debug){
1303
fprintf_plus(stderr, "Failed to get flags for interface "
1304
"\"%s\"\n", interface);
1305
}
1306
return false;
1307
}
1308
1309
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1310
}
1311
1312
__attribute__((nonnull, pure, warn_unused_result))
1282
1313
int notdotentries(const struct dirent *direntry){
1283
1314
/* Skip "." and ".." */
1284
1315
if(direntry->d_name[0] == '.'
1291
1322
}
1292
1323
1293
1324
/* Is this directory entry a runnable program? */
1325
__attribute__((nonnull, warn_unused_result))
1294
1326
int runnable_hook(const struct dirent *direntry){
1295
1327
int ret;
1328
size_t sret;
1296
1329
struct stat st;
1297
1330
1298
1331
if((direntry->d_name)[0] == '\0'){
1300
1333
return 0;
1301
1334
}
1302
1335
1303
/* Save pointer to last character */
1304
char *end = strchr(direntry->d_name, '\0')-1;
1305
1306
if(*end == '~'){
1307
/* Backup name~ */
1308
return 0;
1309
}
1310
1311
if(((direntry->d_name)[0] == '#')
1312
and (*end == '#')){
1313
/* Temporary #name# */
1314
return 0;
1315
}
1316
1317
/* XXX more rules here */
1318
1319
ret = stat(direntry->d_name, &st);
1336
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1337
"abcdefghijklmnopqrstuvwxyz"
1338
"0123456789"
1339
"_.-");
1340
if((direntry->d_name)[sret] != '\0'){
1341
/* Contains non-allowed characters */
1342
if(debug){
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1344
direntry->d_name);
1345
}
1346
return 0;
1347
}
1348
1349
char *fullname = NULL;
1350
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1351
if(ret < 0){
1352
perror_plus("asprintf");
1353
return 0;
1354
}
1355
1356
ret = stat(fullname, &st);
1320
1357
if(ret == -1){
1321
1358
if(debug){
1322
perror_plus("Could not stat plugin");
1359
perror_plus("Could not stat hook");
1323
1360
}
1324
1361
return 0;
1325
1362
}
1326
if(not (st.st_mode & S_ISREG)){
1363
free(fullname);
1364
if(not (S_ISREG(st.st_mode))){
1327
1365
/* Not a regular file */
1366
if(debug){
1367
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1368
direntry->d_name);
1369
}
1328
1370
return 0;
1329
1371
}
1330
1372
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1331
1373
/* Not executable */
1374
if(debug){
1375
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1376
direntry->d_name);
1377
}
1332
1378
return 0;
1333
1379
}
1380
if(debug){
1381
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1382
direntry->d_name);
1383
}
1334
1384
return 1;
1335
1385
}
1336
1386
1337
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1387
__attribute__((nonnull, warn_unused_result))
1388
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1389
mandos_context *mc){
1338
1390
int ret;
1339
1391
struct timespec now;
1340
1392
struct timespec waited_time;
1341
1393
intmax_t block_time;
1342
1394
1343
1395
while(true){
1344
if(mc.current_server == NULL){
1345
if (debug){
1346
fprintf(stderr,
1347
"Wait until first server is found. No timeout!\n");
1396
if(mc->current_server == NULL){
1397
if(debug){
1398
fprintf_plus(stderr, "Wait until first server is found."
1399
" No timeout!\n");
1348
1400
}
1349
1401
ret = avahi_simple_poll_iterate(s, -1);
1350
1402
} else {
1351
if (debug){
1352
fprintf(stderr, "Check current_server if we should run it,"
1353
" or wait\n");
1403
if(debug){
1404
fprintf_plus(stderr, "Check current_server if we should run"
1405
" it, or wait\n");
1354
1406
}
1355
1407
/* the current time */
1356
1408
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1361
1413
/* Calculating in ms how long time between now and server
1362
1414
who we visted longest time ago. Now - last seen. */
1363
1415
waited_time.tv_sec = (now.tv_sec
1364
- mc.current_server->last_seen.tv_sec);
1416
- mc->current_server->last_seen.tv_sec);
1365
1417
waited_time.tv_nsec = (now.tv_nsec
1366
- mc.current_server->last_seen.tv_nsec);
1418
- mc->current_server->last_seen.tv_nsec);
1367
1419
/* total time is 10s/10,000ms.
1368
1420
Converting to s from ms by dividing by 1,000,
1369
1421
and ns to ms by dividing by 1,000,000. */
1371
1423
- ((intmax_t)waited_time.tv_sec * 1000))
1372
1424
- ((intmax_t)waited_time.tv_nsec / 1000000));
1373
1425
1374
if (debug){
1375
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1426
if(debug){
1427
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1428
block_time);
1376
1429
}
1377
1430
1378
1431
if(block_time <= 0){
1379
ret = start_mandos_communication(mc.current_server->ip,
1380
mc.current_server->port,
1381
mc.current_server->if_index,
1382
mc.current_server->af);
1432
ret = start_mandos_communication(mc->current_server->ip,
1433
mc->current_server->port,
1434
mc->current_server->if_index,
1435
mc->current_server->af, mc);
1383
1436
if(ret == 0){
1384
avahi_simple_poll_quit(mc.simple_poll);
1437
avahi_simple_poll_quit(s);
1385
1438
return 0;
1386
1439
}
1387
1440
ret = clock_gettime(CLOCK_MONOTONIC,
1388
&mc.current_server->last_seen);
1441
&mc->current_server->last_seen);
1389
1442
if(ret == -1){
1390
1443
perror_plus("clock_gettime");
1391
1444
return -1;
1392
1445
}
1393
mc.current_server = mc.current_server->next;
1446
mc->current_server = mc->current_server->next;
1394
1447
block_time = 0; /* Call avahi to find new Mandos
1395
1448
servers, but don't block */
1396
1449
}
1398
1451
ret = avahi_simple_poll_iterate(s, (int)block_time);
1399
1452
}
1400
1453
if(ret != 0){
1401
if (ret > 0 or errno != EINTR) {
1454
if(ret > 0 or errno != EINTR){
1402
1455
return (ret != 1) ? ret : 0;
1403
1456
}
1404
1457
}
1405
1458
}
1406
1459
}
1407
1460
1461
/* Set effective uid to 0, return errno */
1462
__attribute__((warn_unused_result))
1463
error_t raise_privileges(void){
1464
error_t old_errno = errno;
1465
error_t ret_errno = 0;
1466
if(seteuid(0) == -1){
1467
ret_errno = errno;
1468
perror_plus("seteuid");
1469
}
1470
errno = old_errno;
1471
return ret_errno;
1472
}
1473
1474
/* Set effective and real user ID to 0. Return errno. */
1475
__attribute__((warn_unused_result))
1476
error_t raise_privileges_permanently(void){
1477
error_t old_errno = errno;
1478
error_t ret_errno = raise_privileges();
1479
if(ret_errno != 0){
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
if(setuid(0) == -1){
1484
ret_errno = errno;
1485
perror_plus("seteuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
/* Set effective user ID to unprivileged saved user ID */
1492
__attribute__((warn_unused_result))
1493
error_t lower_privileges(void){
1494
error_t old_errno = errno;
1495
error_t ret_errno = 0;
1496
if(seteuid(uid) == -1){
1497
ret_errno = errno;
1498
perror_plus("seteuid");
1499
}
1500
errno = old_errno;
1501
return ret_errno;
1502
}
1503
1504
/* Lower privileges permanently */
1505
__attribute__((warn_unused_result))
1506
error_t lower_privileges_permanently(void){
1507
error_t old_errno = errno;
1508
error_t ret_errno = 0;
1509
if(setuid(uid) == -1){
1510
ret_errno = errno;
1511
perror_plus("setuid");
1512
}
1513
errno = old_errno;
1514
return ret_errno;
1515
}
1516
1517
#ifndef O_CLOEXEC
1518
/*
1519
* Based on the example in the GNU LibC manual chapter 13.13 "File
1520
* Descriptor Flags".
1521
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1522
*/
1523
__attribute__((warn_unused_result))
1524
static int set_cloexec_flag(int fd){
1525
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1526
/* If reading the flags failed, return error indication now. */
1527
if(ret < 0){
1528
return ret;
1529
}
1530
/* Store modified flag word in the descriptor. */
1531
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1532
ret | FD_CLOEXEC));
1533
}
1534
#endif /* not O_CLOEXEC */
1535
1536
__attribute__((nonnull))
1537
void run_network_hooks(const char *mode, const char *interface,
1538
const float delay){
1539
struct dirent **direntries;
1540
if(hookdir_fd == -1){
1541
hookdir_fd = open(hookdir, O_RDONLY |
1542
#ifdef O_CLOEXEC
1543
O_CLOEXEC
1544
#else /* not O_CLOEXEC */
1545
0
1546
#endif /* not O_CLOEXEC */
1547
);
1548
if(hookdir_fd == -1){
1549
if(errno == ENOENT){
1550
if(debug){
1551
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1552
" found\n", hookdir);
1553
}
1554
} else {
1555
perror_plus("open");
1556
}
1557
return;
1558
}
1559
#ifndef O_CLOEXEC
1560
if(set_cloexec_flag(hookdir_fd) < 0){
1561
perror_plus("set_cloexec_flag");
1562
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1563
perror_plus("close");
1564
} else {
1565
hookdir_fd = -1;
1566
}
1567
return;
1568
}
1569
#endif /* not O_CLOEXEC */
1570
}
1571
#ifdef __GLIBC__
1572
#if __GLIBC_PREREQ(2, 15)
1573
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1574
runnable_hook, alphasort);
1575
#else /* not __GLIBC_PREREQ(2, 15) */
1576
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1577
alphasort);
1578
#endif /* not __GLIBC_PREREQ(2, 15) */
1579
#else /* not __GLIBC__ */
1580
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1581
alphasort);
1582
#endif /* not __GLIBC__ */
1583
if(numhooks == -1){
1584
perror_plus("scandir");
1585
return;
1586
}
1587
struct dirent *direntry;
1588
int ret;
1589
int devnull = open("/dev/null", O_RDONLY);
1590
for(int i = 0; i < numhooks; i++){
1591
direntry = direntries[i];
1592
char *fullname = NULL;
1593
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1594
if(ret < 0){
1595
perror_plus("asprintf");
1596
continue;
1597
}
1598
if(debug){
1599
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1600
direntry->d_name);
1601
}
1602
pid_t hook_pid = fork();
1603
if(hook_pid == 0){
1604
/* Child */
1605
/* Raise privileges */
1606
if(raise_privileges_permanently() != 0){
1607
perror_plus("Failed to raise privileges");
1608
_exit(EX_NOPERM);
1609
}
1610
/* Set group */
1611
errno = 0;
1612
ret = setgid(0);
1613
if(ret == -1){
1614
perror_plus("setgid");
1615
_exit(EX_NOPERM);
1616
}
1617
/* Reset supplementary groups */
1618
errno = 0;
1619
ret = setgroups(0, NULL);
1620
if(ret == -1){
1621
perror_plus("setgroups");
1622
_exit(EX_NOPERM);
1623
}
1624
ret = dup2(devnull, STDIN_FILENO);
1625
if(ret == -1){
1626
perror_plus("dup2(devnull, STDIN_FILENO)");
1627
_exit(EX_OSERR);
1628
}
1629
ret = close(devnull);
1630
if(ret == -1){
1631
perror_plus("close");
1632
_exit(EX_OSERR);
1633
}
1634
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1635
if(ret == -1){
1636
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1637
_exit(EX_OSERR);
1638
}
1639
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1640
if(ret == -1){
1641
perror_plus("setenv");
1642
_exit(EX_OSERR);
1643
}
1644
ret = setenv("DEVICE", interface, 1);
1645
if(ret == -1){
1646
perror_plus("setenv");
1647
_exit(EX_OSERR);
1648
}
1649
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1650
if(ret == -1){
1651
perror_plus("setenv");
1652
_exit(EX_OSERR);
1653
}
1654
ret = setenv("MODE", mode, 1);
1655
if(ret == -1){
1656
perror_plus("setenv");
1657
_exit(EX_OSERR);
1658
}
1659
char *delaystring;
1660
ret = asprintf(&delaystring, "%f", (double)delay);
1661
if(ret == -1){
1662
perror_plus("asprintf");
1663
_exit(EX_OSERR);
1664
}
1665
ret = setenv("DELAY", delaystring, 1);
1666
if(ret == -1){
1667
free(delaystring);
1668
perror_plus("setenv");
1669
_exit(EX_OSERR);
1670
}
1671
free(delaystring);
1672
if(connect_to != NULL){
1673
ret = setenv("CONNECT", connect_to, 1);
1674
if(ret == -1){
1675
perror_plus("setenv");
1676
_exit(EX_OSERR);
1677
}
1678
}
1679
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1680
perror_plus("execl");
1681
_exit(EXIT_FAILURE);
1682
}
1683
} else {
1684
int status;
1685
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1686
perror_plus("waitpid");
1687
free(fullname);
1688
continue;
1689
}
1690
if(WIFEXITED(status)){
1691
if(WEXITSTATUS(status) != 0){
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1693
" with status %d\n", direntry->d_name,
1694
WEXITSTATUS(status));
1695
free(fullname);
1696
continue;
1697
}
1698
} else if(WIFSIGNALED(status)){
1699
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1700
" signal %d\n", direntry->d_name,
1701
WTERMSIG(status));
1702
free(fullname);
1703
continue;
1704
} else {
1705
fprintf_plus(stderr, "Warning: network hook \"%s\""
1706
" crashed\n", direntry->d_name);
1707
free(fullname);
1708
continue;
1709
}
1710
}
1711
free(fullname);
1712
if(debug){
1713
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1714
direntry->d_name);
1715
}
1716
}
1717
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1718
perror_plus("close");
1719
} else {
1720
hookdir_fd = -1;
1721
}
1722
close(devnull);
1723
}
1724
1725
__attribute__((nonnull, warn_unused_result))
1726
error_t bring_up_interface(const char *const interface,
1727
const float delay){
1728
error_t old_errno = errno;
1729
int ret;
1730
struct ifreq network;
1731
unsigned int if_index = if_nametoindex(interface);
1732
if(if_index == 0){
1733
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1734
errno = old_errno;
1735
return ENXIO;
1736
}
1737
1738
if(quit_now){
1739
errno = old_errno;
1740
return EINTR;
1741
}
1742
1743
if(not interface_is_up(interface)){
1744
error_t ret_errno = 0, ioctl_errno = 0;
1745
if(not get_flags(interface, &network)){
1746
ret_errno = errno;
1747
fprintf_plus(stderr, "Failed to get flags for interface "
1748
"\"%s\"\n", interface);
1749
errno = old_errno;
1750
return ret_errno;
1751
}
1752
network.ifr_flags |= IFF_UP; /* set flag */
1753
1754
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1755
if(sd == -1){
1756
ret_errno = errno;
1757
perror_plus("socket");
1758
errno = old_errno;
1759
return ret_errno;
1760
}
1761
1762
if(quit_now){
1763
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1764
if(ret == -1){
1765
perror_plus("close");
1766
}
1767
errno = old_errno;
1768
return EINTR;
1769
}
1770
1771
if(debug){
1772
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1773
interface);
1774
}
1775
1776
/* Raise privileges */
1777
ret_errno = raise_privileges();
1778
if(ret_errno != 0){
1779
perror_plus("Failed to raise privileges");
1780
}
1781
1782
#ifdef __linux__
1783
int ret_linux;
1784
bool restore_loglevel = false;
1785
if(ret_errno == 0){
1786
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1787
messages about the network interface to mess up the prompt */
1788
ret_linux = klogctl(8, NULL, 5);
1789
if(ret_linux == -1){
1790
perror_plus("klogctl");
1791
} else {
1792
restore_loglevel = true;
1793
}
1794
}
1795
#endif /* __linux__ */
1796
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1797
ioctl_errno = errno;
1798
#ifdef __linux__
1799
if(restore_loglevel){
1800
ret_linux = klogctl(7, NULL, 0);
1801
if(ret_linux == -1){
1802
perror_plus("klogctl");
1803
}
1804
}
1805
#endif /* __linux__ */
1806
1807
/* If raise_privileges() succeeded above */
1808
if(ret_errno == 0){
1809
/* Lower privileges */
1810
ret_errno = lower_privileges();
1811
if(ret_errno != 0){
1812
errno = ret_errno;
1813
perror_plus("Failed to lower privileges");
1814
}
1815
}
1816
1817
/* Close the socket */
1818
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1819
if(ret == -1){
1820
perror_plus("close");
1821
}
1822
1823
if(ret_setflags == -1){
1824
errno = ioctl_errno;
1825
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1826
errno = old_errno;
1827
return ioctl_errno;
1828
}
1829
} else if(debug){
1830
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1831
interface);
1832
}
1833
1834
/* Sleep checking until interface is running.
1835
Check every 0.25s, up to total time of delay */
1836
for(int i=0; i < delay * 4; i++){
1837
if(interface_is_running(interface)){
1838
break;
1839
}
1840
struct timespec sleeptime = { .tv_nsec = 250000000 };
1841
ret = nanosleep(&sleeptime, NULL);
1842
if(ret == -1 and errno != EINTR){
1843
perror_plus("nanosleep");
1844
}
1845
}
1846
1847
errno = old_errno;
1848
return 0;
1849
}
1850
1851
__attribute__((nonnull, warn_unused_result))
1852
error_t take_down_interface(const char *const interface){
1853
error_t old_errno = errno;
1854
struct ifreq network;
1855
unsigned int if_index = if_nametoindex(interface);
1856
if(if_index == 0){
1857
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1858
errno = old_errno;
1859
return ENXIO;
1860
}
1861
if(interface_is_up(interface)){
1862
error_t ret_errno = 0, ioctl_errno = 0;
1863
if(not get_flags(interface, &network) and debug){
1864
ret_errno = errno;
1865
fprintf_plus(stderr, "Failed to get flags for interface "
1866
"\"%s\"\n", interface);
1867
errno = old_errno;
1868
return ret_errno;
1869
}
1870
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1871
1872
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1873
if(sd == -1){
1874
ret_errno = errno;
1875
perror_plus("socket");
1876
errno = old_errno;
1877
return ret_errno;
1878
}
1879
1880
if(debug){
1881
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1882
interface);
1883
}
1884
1885
/* Raise privileges */
1886
ret_errno = raise_privileges();
1887
if(ret_errno != 0){
1888
perror_plus("Failed to raise privileges");
1889
}
1890
1891
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1892
ioctl_errno = errno;
1893
1894
/* If raise_privileges() succeeded above */
1895
if(ret_errno == 0){
1896
/* Lower privileges */
1897
ret_errno = lower_privileges();
1898
if(ret_errno != 0){
1899
errno = ret_errno;
1900
perror_plus("Failed to lower privileges");
1901
}
1902
}
1903
1904
/* Close the socket */
1905
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1906
if(ret == -1){
1907
perror_plus("close");
1908
}
1909
1910
if(ret_setflags == -1){
1911
errno = ioctl_errno;
1912
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1913
errno = old_errno;
1914
return ioctl_errno;
1915
}
1916
} else if(debug){
1917
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1918
interface);
1919
}
1920
1921
errno = old_errno;
1922
return 0;
1923
}
1924
1408
1925
int main(int argc, char *argv[]){
1926
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1927
.priority = "SECURE256:!CTYPE-X.509:"
1928
"+CTYPE-OPENPGP", .current_server = NULL,
1929
.interfaces = NULL, .interfaces_size = 0 };
1409
1930
AvahiSServiceBrowser *sb = NULL;
1410
int error;
1931
error_t ret_errno;
1411
1932
int ret;
1412
1933
intmax_t tmpmax;
1413
1934
char *tmp;
1414
1935
int exitcode = EXIT_SUCCESS;
1415
const char *interface = "";
1416
struct ifreq network;
1417
int sd = -1;
1418
bool take_down_interface = false;
1419
uid_t uid;
1420
gid_t gid;
1421
char tempdir[] = "/tmp/mandosXXXXXX";
1422
bool tempdir_created = false;
1936
char *interfaces_to_take_down = NULL;
1937
size_t interfaces_to_take_down_size = 0;
1938
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1939
char old_tempdir[] = "/tmp/mandosXXXXXX";
1940
char *tempdir = NULL;
1423
1941
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1424
1942
const char *seckey = PATHDIR "/" SECKEY;
1425
1943
const char *pubkey = PATHDIR "/" PUBKEY;
1944
char *interfaces_hooks = NULL;
1426
1945
1427
1946
bool gnutls_initialized = false;
1428
1947
bool gpgme_initialized = false;
1490
2009
.group = 2 },
1491
2010
{ .name = "retry", .key = 132,
1492
2011
.arg = "SECONDS",
1493
.doc = "Retry interval used when denied by the mandos server",
2012
.doc = "Retry interval used when denied by the Mandos server",
2013
.group = 2 },
2014
{ .name = "network-hook-dir", .key = 133,
2015
.arg = "DIR",
2016
.doc = "Directory where network hooks are located",
1494
2017
.group = 2 },
1495
2018
/*
1496
2019
* These reproduce what we would get without ARGP_NO_HELP
1515
2038
connect_to = arg;
1516
2039
break;
1517
2040
case 'i': /* --interface */
1518
interface = arg;
2041
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2042
arg, (int)',');
2043
if(ret_errno != 0){
2044
argp_error(state, "%s", strerror(ret_errno));
2045
}
1519
2046
break;
1520
2047
case 's': /* --seckey */
1521
2048
seckey = arg;
1550
2077
argp_error(state, "Bad retry interval");
1551
2078
}
1552
2079
break;
2080
case 133: /* --network-hook-dir */
2081
hookdir = arg;
2082
break;
1553
2083
/*
1554
2084
* These reproduce what we would get without ARGP_NO_HELP
1555
2085
*/
1561
2091
argp_state_help(state, state->out_stream,
1562
2092
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1563
2093
case 'V': /* --version */
1564
fprintf(state->out_stream, "%s\n", argp_program_version);
2094
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1565
2095
exit(argp_err_exit_status);
1566
2096
break;
1567
2097
default:
1594
2124
{
1595
2125
/* Work around Debian bug #633582:
1596
2126
<http://bugs.debian.org/633582> */
1597
struct stat st;
1598
1599
/* Re-raise priviliges */
1600
errno = 0;
1601
ret = seteuid(0);
1602
if(ret == -1){
1603
perror_plus("seteuid");
1604
}
1605
1606
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1607
int seckey_fd = open(seckey, O_RDONLY);
1608
if(seckey_fd == -1){
1609
perror_plus("open");
1610
} else {
1611
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1612
if(ret == -1){
1613
perror_plus("fstat");
1614
} else {
1615
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1616
ret = fchown(seckey_fd, uid, gid);
1617
if(ret == -1){
1618
perror_plus("fchown");
1619
}
1620
}
1621
}
1622
TEMP_FAILURE_RETRY(close(seckey_fd));
1623
}
1624
}
1625
1626
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1627
int pubkey_fd = open(pubkey, O_RDONLY);
1628
if(pubkey_fd == -1){
1629
perror_plus("open");
1630
} else {
1631
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1632
if(ret == -1){
1633
perror_plus("fstat");
1634
} else {
1635
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1636
ret = fchown(pubkey_fd, uid, gid);
1637
if(ret == -1){
1638
perror_plus("fchown");
1639
}
1640
}
1641
}
1642
TEMP_FAILURE_RETRY(close(pubkey_fd));
1643
}
1644
}
1645
1646
/* Lower privileges */
1647
errno = 0;
1648
ret = seteuid(uid);
1649
if(ret == -1){
1650
perror_plus("seteuid");
1651
}
1652
}
1653
1654
/* Find network hooks and run them */
1655
{
1656
struct dirent **direntries;
1657
struct dirent *direntry;
1658
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1659
alphasort);
1660
int devnull = open("/dev/null", O_RDONLY);
1661
for(int i = 0; i < numhooks; i++){
1662
direntry = direntries[0];
1663
char *fullname = NULL;
1664
ret = asprintf(&fullname, "%s/%s", tempdir,
1665
direntry->d_name);
1666
if(ret < 0){
1667
perror_plus("asprintf");
1668
continue;
1669
}
1670
pid_t hook_pid = fork();
1671
if(hook_pid == 0){
1672
/* Child */
1673
dup2(devnull, STDIN_FILENO);
1674
close(devnull);
1675
dup2(STDERR_FILENO, STDOUT_FILENO);
1676
setenv("DEVICE", interface, 1);
1677
setenv("VERBOSE", debug ? "1" : "0", 1);
1678
setenv("MODE", "start", 1);
1679
/* setenv( XXX more here */
1680
ret = execl(fullname, direntry->d_name, "start");
1681
perror_plus("execl");
1682
}
1683
free(fullname);
1684
if(quit_now){
2127
2128
/* Re-raise privileges */
2129
ret_errno = raise_privileges();
2130
if(ret_errno != 0){
2131
errno = ret_errno;
2132
perror_plus("Failed to raise privileges");
2133
} else {
2134
struct stat st;
2135
2136
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2137
int seckey_fd = open(seckey, O_RDONLY);
2138
if(seckey_fd == -1){
2139
perror_plus("open");
2140
} else {
2141
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2142
if(ret == -1){
2143
perror_plus("fstat");
2144
} else {
2145
if(S_ISREG(st.st_mode)
2146
and st.st_uid == 0 and st.st_gid == 0){
2147
ret = fchown(seckey_fd, uid, gid);
2148
if(ret == -1){
2149
perror_plus("fchown");
2150
}
2151
}
2152
}
2153
TEMP_FAILURE_RETRY(close(seckey_fd));
2154
}
2155
}
2156
2157
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2158
int pubkey_fd = open(pubkey, O_RDONLY);
2159
if(pubkey_fd == -1){
2160
perror_plus("open");
2161
} else {
2162
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2163
if(ret == -1){
2164
perror_plus("fstat");
2165
} else {
2166
if(S_ISREG(st.st_mode)
2167
and st.st_uid == 0 and st.st_gid == 0){
2168
ret = fchown(pubkey_fd, uid, gid);
2169
if(ret == -1){
2170
perror_plus("fchown");
2171
}
2172
}
2173
}
2174
TEMP_FAILURE_RETRY(close(pubkey_fd));
2175
}
2176
}
2177
2178
/* Lower privileges */
2179
ret_errno = lower_privileges();
2180
if(ret_errno != 0){
2181
errno = ret_errno;
2182
perror_plus("Failed to lower privileges");
2183
}
2184
}
2185
}
2186
2187
/* Remove invalid interface names (except "none") */
2188
{
2189
char *interface = NULL;
2190
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2191
interface))){
2192
if(strcmp(interface, "none") != 0
2193
and if_nametoindex(interface) == 0){
2194
if(interface[0] != '\0'){
2195
fprintf_plus(stderr, "Not using nonexisting interface"
2196
" \"%s\"\n", interface);
2197
}
2198
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2199
interface = NULL;
2200
}
2201
}
2202
}
2203
2204
/* Run network hooks */
2205
{
2206
if(mc.interfaces != NULL){
2207
interfaces_hooks = malloc(mc.interfaces_size);
2208
if(interfaces_hooks == NULL){
2209
perror_plus("malloc");
1685
2210
goto end;
1686
2211
}
2212
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2213
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
1687
2214
}
1688
close(devnull);
2215
run_network_hooks("start", interfaces_hooks != NULL ?
2216
interfaces_hooks : "", delay);
1689
2217
}
1690
2218
1691
2219
if(not debug){
1692
2220
avahi_set_log_function(empty_log);
1693
2221
}
1694
2222
1695
if(interface[0] == '\0'){
1696
struct dirent **direntries;
1697
ret = scandir(sys_class_net, &direntries, good_interface,
1698
alphasort);
1699
if(ret >= 1){
1700
/* Pick the first good interface */
1701
interface = strdup(direntries[0]->d_name);
1702
if(debug){
1703
fprintf(stderr, "Using interface \"%s\"\n", interface);
1704
}
1705
if(interface == NULL){
1706
perror_plus("malloc");
1707
free(direntries);
1708
exitcode = EXIT_FAILURE;
1709
goto end;
1710
}
1711
free(direntries);
1712
} else {
1713
free(direntries);
1714
fprintf(stderr, "Could not find a network interface\n");
1715
exitcode = EXIT_FAILURE;
1716
goto end;
1717
}
1718
}
1719
1720
2223
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1721
2224
from the signal handler */
1722
2225
/* Initialize the pseudo-RNG for Avahi */
1723
2226
srand((unsigned int) time(NULL));
1724
mc.simple_poll = avahi_simple_poll_new();
1725
if(mc.simple_poll == NULL){
1726
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2227
simple_poll = avahi_simple_poll_new();
2228
if(simple_poll == NULL){
2229
fprintf_plus(stderr,
2230
"Avahi: Failed to create simple poll object.\n");
1727
2231
exitcode = EX_UNAVAILABLE;
1728
2232
goto end;
1729
2233
}
1791
2295
}
1792
2296
}
1793
2297
1794
/* If the interface is down, bring it up */
1795
if(strcmp(interface, "none") != 0){
1796
if_index = (AvahiIfIndex) if_nametoindex(interface);
1797
if(if_index == 0){
1798
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1799
exitcode = EX_UNAVAILABLE;
1800
goto end;
1801
}
1802
1803
if(quit_now){
1804
goto end;
1805
}
1806
1807
/* Re-raise priviliges */
1808
errno = 0;
1809
ret = seteuid(0);
1810
if(ret == -1){
1811
perror_plus("seteuid");
1812
}
1813
1814
#ifdef __linux__
1815
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1816
messages about the network interface to mess up the prompt */
1817
ret = klogctl(8, NULL, 5);
1818
bool restore_loglevel = true;
1819
if(ret == -1){
1820
restore_loglevel = false;
1821
perror_plus("klogctl");
1822
}
1823
#endif /* __linux__ */
1824
1825
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1826
if(sd < 0){
1827
perror_plus("socket");
1828
exitcode = EX_OSERR;
1829
#ifdef __linux__
1830
if(restore_loglevel){
1831
ret = klogctl(7, NULL, 0);
1832
if(ret == -1){
1833
perror_plus("klogctl");
1834
}
1835
}
1836
#endif /* __linux__ */
1837
/* Lower privileges */
1838
errno = 0;
1839
ret = seteuid(uid);
1840
if(ret == -1){
1841
perror_plus("seteuid");
1842
}
1843
goto end;
1844
}
1845
strcpy(network.ifr_name, interface);
1846
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1847
if(ret == -1){
1848
perror_plus("ioctl SIOCGIFFLAGS");
1849
#ifdef __linux__
1850
if(restore_loglevel){
1851
ret = klogctl(7, NULL, 0);
1852
if(ret == -1){
1853
perror_plus("klogctl");
1854
}
1855
}
1856
#endif /* __linux__ */
1857
exitcode = EX_OSERR;
1858
/* Lower privileges */
1859
errno = 0;
1860
ret = seteuid(uid);
1861
if(ret == -1){
1862
perror_plus("seteuid");
1863
}
1864
goto end;
1865
}
1866
if((network.ifr_flags & IFF_UP) == 0){
1867
network.ifr_flags |= IFF_UP;
1868
take_down_interface = true;
1869
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1870
if(ret == -1){
1871
take_down_interface = false;
1872
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1873
exitcode = EX_OSERR;
1874
#ifdef __linux__
1875
if(restore_loglevel){
1876
ret = klogctl(7, NULL, 0);
1877
if(ret == -1){
1878
perror_plus("klogctl");
2298
/* If no interfaces were specified, make a list */
2299
if(mc.interfaces == NULL){
2300
struct dirent **direntries;
2301
/* Look for any good interfaces */
2302
ret = scandir(sys_class_net, &direntries, good_interface,
2303
alphasort);
2304
if(ret >= 1){
2305
/* Add all found interfaces to interfaces list */
2306
for(int i = 0; i < ret; ++i){
2307
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2308
direntries[i]->d_name);
2309
if(ret_errno != 0){
2310
errno = ret_errno;
2311
perror_plus("argz_add");
2312
continue;
2313
}
2314
if(debug){
2315
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2316
direntries[i]->d_name);
2317
}
2318
}
2319
free(direntries);
2320
} else {
2321
free(direntries);
2322
fprintf_plus(stderr, "Could not find a network interface\n");
2323
exitcode = EXIT_FAILURE;
2324
goto end;
2325
}
2326
}
2327
2328
/* Bring up interfaces which are down, and remove any "none"s */
2329
{
2330
char *interface = NULL;
2331
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2332
interface))){
2333
/* If interface name is "none", stop bringing up interfaces.
2334
Also remove all instances of "none" from the list */
2335
if(strcmp(interface, "none") == 0){
2336
argz_delete(&mc.interfaces, &mc.interfaces_size,
2337
interface);
2338
interface = NULL;
2339
while((interface = argz_next(mc.interfaces,
2340
mc.interfaces_size, interface))){
2341
if(strcmp(interface, "none") == 0){
2342
argz_delete(&mc.interfaces, &mc.interfaces_size,
2343
interface);
2344
interface = NULL;
1879
2345
}
1880
2346
}
1881
#endif /* __linux__ */
1882
/* Lower privileges */
1883
errno = 0;
1884
ret = seteuid(uid);
1885
if(ret == -1){
1886
perror_plus("seteuid");
1887
}
1888
goto end;
1889
}
1890
}
1891
/* Sleep checking until interface is running.
1892
Check every 0.25s, up to total time of delay */
1893
for(int i=0; i < delay * 4; i++){
1894
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1895
if(ret == -1){
1896
perror_plus("ioctl SIOCGIFFLAGS");
1897
} else if(network.ifr_flags & IFF_RUNNING){
1898
2347
break;
1899
2348
}
1900
struct timespec sleeptime = { .tv_nsec = 250000000 };
1901
ret = nanosleep(&sleeptime, NULL);
1902
if(ret == -1 and errno != EINTR){
1903
perror_plus("nanosleep");
1904
}
1905
}
1906
if(not take_down_interface){
1907
/* We won't need the socket anymore */
1908
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1909
if(ret == -1){
1910
perror_plus("close");
1911
}
1912
}
1913
#ifdef __linux__
1914
if(restore_loglevel){
1915
/* Restores kernel loglevel to default */
1916
ret = klogctl(7, NULL, 0);
1917
if(ret == -1){
1918
perror_plus("klogctl");
1919
}
1920
}
1921
#endif /* __linux__ */
1922
/* Lower privileges */
1923
errno = 0;
1924
if(take_down_interface){
1925
/* Lower privileges */
1926
ret = seteuid(uid);
1927
if(ret == -1){
1928
perror_plus("seteuid");
1929
}
1930
} else {
1931
/* Lower privileges permanently */
1932
ret = setuid(uid);
1933
if(ret == -1){
1934
perror_plus("setuid");
1935
}
1936
}
2349
bool interface_was_up = interface_is_up(interface);
2350
errno = bring_up_interface(interface, delay);
2351
if(not interface_was_up){
2352
if(errno != 0){
2353
perror_plus("Failed to bring up interface");
2354
} else {
2355
errno = argz_add(&interfaces_to_take_down,
2356
&interfaces_to_take_down_size,
2357
interface);
2358
if(errno != 0){
2359
perror_plus("argz_add");
2360
}
2361
}
2362
}
2363
}
2364
if(debug and (interfaces_to_take_down == NULL)){
2365
fprintf_plus(stderr, "No interfaces were brought up\n");
2366
}
2367
}
2368
2369
/* If we only got one interface, explicitly use only that one */
2370
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2371
if(debug){
2372
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2373
mc.interfaces);
2374
}
2375
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1937
2376
}
1938
2377
1939
2378
if(quit_now){
1940
2379
goto end;
1941
2380
}
1942
2381
1943
ret = init_gnutls_global(pubkey, seckey);
2382
ret = init_gnutls_global(pubkey, seckey, &mc);
1944
2383
if(ret == -1){
1945
fprintf(stderr, "init_gnutls_global failed\n");
2384
fprintf_plus(stderr, "init_gnutls_global failed\n");
1946
2385
exitcode = EX_UNAVAILABLE;
1947
2386
goto end;
1948
2387
} else {
1953
2392
goto end;
1954
2393
}
1955
2394
1956
if(mkdtemp(tempdir) == NULL){
2395
/* Try /run/tmp before /tmp */
2396
tempdir = mkdtemp(run_tempdir);
2397
if(tempdir == NULL and errno == ENOENT){
2398
if(debug){
2399
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2400
run_tempdir, old_tempdir);
2401
}
2402
tempdir = mkdtemp(old_tempdir);
2403
}
2404
if(tempdir == NULL){
1957
2405
perror_plus("mkdtemp");
1958
2406
goto end;
1959
2407
}
1960
tempdir_created = true;
1961
2408
1962
2409
if(quit_now){
1963
2410
goto end;
1964
2411
}
1965
2412
1966
if(not init_gpgme(pubkey, seckey, tempdir)){
1967
fprintf(stderr, "init_gpgme failed\n");
2413
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2414
fprintf_plus(stderr, "init_gpgme failed\n");
1968
2415
exitcode = EX_UNAVAILABLE;
1969
2416
goto end;
1970
2417
} else {
1979
2426
/* Connect directly, do not use Zeroconf */
1980
2427
/* (Mainly meant for debugging) */
1981
2428
char *address = strrchr(connect_to, ':');
2429
1982
2430
if(address == NULL){
1983
fprintf(stderr, "No colon in address\n");
2431
fprintf_plus(stderr, "No colon in address\n");
1984
2432
exitcode = EX_USAGE;
1985
2433
goto end;
1986
2434
}
1989
2437
goto end;
1990
2438
}
1991
2439
1992
uint16_t port;
2440
in_port_t port;
1993
2441
errno = 0;
1994
2442
tmpmax = strtoimax(address+1, &tmp, 10);
1995
2443
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1996
or tmpmax != (uint16_t)tmpmax){
1997
fprintf(stderr, "Bad port number\n");
2444
or tmpmax != (in_port_t)tmpmax){
2445
fprintf_plus(stderr, "Bad port number\n");
1998
2446
exitcode = EX_USAGE;
1999
2447
goto end;
2000
2448
}
2001
2449
2002
2450
if(quit_now){
2003
2451
goto end;
2004
2452
}
2005
2453
2006
port = (uint16_t)tmpmax;
2454
port = (in_port_t)tmpmax;
2007
2455
*address = '\0';
2008
2456
/* Colon in address indicates IPv6 */
2009
2457
int af;
2025
2473
}
2026
2474
2027
2475
while(not quit_now){
2028
ret = start_mandos_communication(address, port, if_index, af);
2476
ret = start_mandos_communication(address, port, if_index, af,
2477
&mc);
2029
2478
if(quit_now or ret == 0){
2030
2479
break;
2031
2480
}
2032
2481
if(debug){
2033
fprintf(stderr, "Retrying in %d seconds\n",
2034
(int)retry_interval);
2482
fprintf_plus(stderr, "Retrying in %d seconds\n",
2483
(int)retry_interval);
2035
2484
}
2036
sleep((int)retry_interval);
2485
sleep((unsigned int)retry_interval);
2037
2486
}
2038
2487
2039
if (not quit_now){
2488
if(not quit_now){
2040
2489
exitcode = EXIT_SUCCESS;
2041
2490
}
2042
2491
2057
2506
config.publish_domain = 0;
2058
2507
2059
2508
/* Allocate a new server */
2060
mc.server = avahi_server_new(avahi_simple_poll_get
2061
(mc.simple_poll), &config, NULL,
2062
NULL, &error);
2509
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2510
&config, NULL, NULL, &ret_errno);
2063
2511
2064
2512
/* Free the Avahi configuration data */
2065
2513
avahi_server_config_free(&config);
2067
2515
2068
2516
/* Check if creating the Avahi server object succeeded */
2069
2517
if(mc.server == NULL){
2070
fprintf(stderr, "Failed to create Avahi server: %s\n",
2071
avahi_strerror(error));
2518
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2519
avahi_strerror(ret_errno));
2072
2520
exitcode = EX_UNAVAILABLE;
2073
2521
goto end;
2074
2522
}
2080
2528
/* Create the Avahi service browser */
2081
2529
sb = avahi_s_service_browser_new(mc.server, if_index,
2082
2530
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2083
NULL, 0, browse_callback, NULL);
2531
NULL, 0, browse_callback,
2532
(void *)&mc);
2084
2533
if(sb == NULL){
2085
fprintf(stderr, "Failed to create service browser: %s\n",
2086
avahi_strerror(avahi_server_errno(mc.server)));
2534
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2535
avahi_strerror(avahi_server_errno(mc.server)));
2087
2536
exitcode = EX_UNAVAILABLE;
2088
2537
goto end;
2089
2538
}
2095
2544
/* Run the main loop */
2096
2545
2097
2546
if(debug){
2098
fprintf(stderr, "Starting Avahi loop search\n");
2547
fprintf_plus(stderr, "Starting Avahi loop search\n");
2099
2548
}
2100
2101
ret = avahi_loop_with_timeout(mc.simple_poll,
2102
(int)(retry_interval * 1000));
2549
2550
ret = avahi_loop_with_timeout(simple_poll,
2551
(int)(retry_interval * 1000), &mc);
2103
2552
if(debug){
2104
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2105
(ret == 0) ? "successfully" : "with error");
2553
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2554
(ret == 0) ? "successfully" : "with error");
2106
2555
}
2107
2556
2108
2557
end:
2109
2558
2110
2559
if(debug){
2111
fprintf(stderr, "%s exiting\n", argv[0]);
2560
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2112
2561
}
2113
2562
2114
2563
/* Cleanup things */
2564
free(mc.interfaces);
2565
2115
2566
if(sb != NULL)
2116
2567
avahi_s_service_browser_free(sb);
2117
2568
2118
2569
if(mc.server != NULL)
2119
2570
avahi_server_free(mc.server);
2120
2571
2121
if(mc.simple_poll != NULL)
2122
avahi_simple_poll_free(mc.simple_poll);
2572
if(simple_poll != NULL)
2573
avahi_simple_poll_free(simple_poll);
2123
2574
2124
2575
if(gnutls_initialized){
2125
2576
gnutls_certificate_free_credentials(mc.cred);
2130
2581
if(gpgme_initialized){
2131
2582
gpgme_release(mc.ctx);
2132
2583
}
2133
2584
2134
2585
/* Cleans up the circular linked list of Mandos servers the client
2135
2586
has seen */
2136
2587
if(mc.current_server != NULL){
2142
2593
}
2143
2594
}
2144
2595
2145
/* XXX run network hooks "stop" here */
2146
2147
/* Take down the network interface */
2148
if(take_down_interface){
2149
/* Re-raise priviliges */
2150
errno = 0;
2151
ret = seteuid(0);
2152
if(ret == -1){
2153
perror_plus("seteuid");
2596
/* Re-raise privileges */
2597
{
2598
ret_errno = raise_privileges();
2599
if(ret_errno != 0){
2600
perror_plus("Failed to raise privileges");
2601
} else {
2602
2603
/* Run network hooks */
2604
run_network_hooks("stop", interfaces_hooks != NULL ?
2605
interfaces_hooks : "", delay);
2606
2607
/* Take down the network interfaces which were brought up */
2608
{
2609
char *interface = NULL;
2610
while((interface=argz_next(interfaces_to_take_down,
2611
interfaces_to_take_down_size,
2612
interface))){
2613
ret_errno = take_down_interface(interface);
2614
if(ret_errno != 0){
2615
errno = ret_errno;
2616
perror_plus("Failed to take down interface");
2617
}
2618
}
2619
if(debug and (interfaces_to_take_down == NULL)){
2620
fprintf_plus(stderr, "No interfaces needed to be taken"
2621
" down\n");
2622
}
2623
}
2154
2624
}
2155
if(geteuid() == 0){
2156
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2157
if(ret == -1){
2158
perror_plus("ioctl SIOCGIFFLAGS");
2159
} else if(network.ifr_flags & IFF_UP) {
2160
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2161
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2162
if(ret == -1){
2163
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2164
}
2165
}
2166
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2167
if(ret == -1){
2168
perror_plus("close");
2169
}
2170
/* Lower privileges permanently */
2171
errno = 0;
2172
ret = setuid(uid);
2173
if(ret == -1){
2174
perror_plus("setuid");
2175
}
2625
2626
ret_errno = lower_privileges_permanently();
2627
if(ret_errno != 0){
2628
perror_plus("Failed to lower privileges permanently");
2176
2629
}
2177
2630
}
2178
2631
2632
free(interfaces_to_take_down);
2633
free(interfaces_hooks);
2634
2179
2635
/* Removes the GPGME temp directory and all files inside */
2180
if(tempdir_created){
2636
if(tempdir != NULL){
2181
2637
struct dirent **direntries = NULL;
2182
2638
struct dirent *direntry = NULL;
2183
2639
int numentries = scandir(tempdir, &direntries, notdotentries,
2184
2640
alphasort);
2185
if (numentries > 0){
2641
if(numentries > 0){
2186
2642
for(int i = 0; i < numentries; i++){
2187
2643
direntry = direntries[i];
2188
2644
char *fullname = NULL;
2194
2650
}
2195
2651
ret = remove(fullname);
2196
2652
if(ret == -1){
2197
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2198
strerror(errno));
2653
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2654
strerror(errno));
2199
2655
}
2200
2656
free(fullname);
2201
2657
}
2202
2658
}
2203
2659
2204
2660
/* need to clean even if 0 because man page doesn't specify */
2205
2661
free(direntries);
2206
if (numentries == -1){
2662
if(numentries == -1){
2207
2663
perror_plus("scandir");
2208
2664
}
2209
2665
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0