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» Revision
237.16.3
(compared to revision 237.7.241)
: plugins.d/mandos-client.c
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- Committer: teddy at bsnet
- Date: 2011-11-12 16:24:19 UTC
- mto: (237.15.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 290.
- Revision ID: teddy@fukt.bsnet.se-20111112162419-pe83skogsctxuzw7
* plugins.d/mandos-client.c: Prefix all printouts with "Mandos plugin
mandos-client: ".
* plugins.d/mandos-client.c (main): Wait for network hooks and check
the completion status.
mandos-client: ".
* plugins.d/mandos-client.c (main): Wait for network hooks and check
the completion status.
- 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
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
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() */
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
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,
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
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
90
98
91
#ifdef __linux__
99
92
#include <sys/klog.h> /* klogctl() */
117
110
init_gnutls_session(),
118
111
GNUTLS_* */
119
112
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
122
115
123
116
/* GPGME */
124
117
#include <gpgme.h> /* All GPGME types, constants and
140
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
141
134
static const char sys_class_net[] = "/sys/class/net";
142
135
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
int hookdir_fd = -1;
145
uid_t uid = 65534;
146
gid_t gid = 65534;
147
136
148
137
/* Doubly linked list that need to be circularly linked when used */
149
138
typedef struct server{
150
139
const char *ip;
151
in_port_t port;
140
uint16_t port;
152
141
AvahiIfIndex if_index;
153
142
int af;
154
143
struct timespec last_seen;
158
147
159
148
/* Used for passing in values through the Avahi callback functions */
160
149
typedef struct {
150
AvahiSimplePoll *simple_poll;
161
151
AvahiServer *server;
162
152
gnutls_certificate_credentials_t cred;
163
153
unsigned int dh_bits;
165
155
const char *priority;
166
156
gpgme_ctx_t ctx;
167
157
server *current_server;
168
char *interfaces;
169
size_t interfaces_size;
170
158
} mandos_context;
171
159
172
/* global so signal handler can reach it*/
173
AvahiSimplePoll *simple_poll;
160
/* global context so signal handler can reach it*/
161
mandos_context mc = { .simple_poll = NULL, .server = NULL,
162
.dh_bits = 1024, .priority = "SECURE256"
163
":!CTYPE-X.509:+CTYPE-OPENPGP",
164
.current_server = NULL };
174
165
175
166
sig_atomic_t quit_now = 0;
176
167
int signal_received = 0;
177
168
178
169
/* Function to use when printing errors */
179
170
void perror_plus(const char *print_text){
180
int e = errno;
181
171
fprintf(stderr, "Mandos plugin %s: ",
182
172
program_invocation_short_name);
183
errno = e;
184
173
perror(print_text);
185
174
}
186
175
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
197
176
/*
198
177
* Make additional room in "buffer" for at least BUFFER_SIZE more
199
178
* bytes. "buffer_capacity" is how much is currently allocated,
200
179
* "buffer_length" is how much is already used.
201
180
*/
202
__attribute__((nonnull, warn_unused_result))
203
181
size_t incbuffer(char **buffer, size_t buffer_length,
204
size_t buffer_capacity){
182
size_t buffer_capacity){
205
183
if(buffer_length + BUFFER_SIZE > buffer_capacity){
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
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
185
if(buffer == NULL){
212
186
return 0;
213
187
}
214
*buffer = new_buf;
215
188
buffer_capacity += BUFFER_SIZE;
216
189
}
217
190
return buffer_capacity;
218
191
}
219
192
220
193
/* Add server to set of servers to retry periodically */
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){
194
int add_server(const char *ip, uint16_t port,
195
AvahiIfIndex if_index,
196
int af){
224
197
int ret;
225
198
server *new_server = malloc(sizeof(server));
226
199
if(new_server == NULL){
227
200
perror_plus("malloc");
228
return false;
201
return -1;
229
202
}
230
203
*new_server = (server){ .ip = strdup(ip),
231
.port = port,
232
.if_index = if_index,
233
.af = af };
204
.port = port,
205
.if_index = if_index,
206
.af = af };
234
207
if(new_server->ip == NULL){
235
208
perror_plus("strdup");
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;
209
return -1;
242
210
}
243
211
/* Special case of first server */
244
if(*current_server == NULL){
212
if (mc.current_server == NULL){
245
213
new_server->next = new_server;
246
214
new_server->prev = new_server;
247
*current_server = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
248
217
} else {
249
/* Place the new server last in the list */
250
new_server->next = *current_server;
251
new_server->prev = (*current_server)->prev;
218
new_server->next = mc.current_server;
219
new_server->prev = mc.current_server->prev;
252
220
new_server->prev->next = new_server;
253
(*current_server)->prev = new_server;
254
}
255
return true;
221
mc.current_server->prev = new_server;
222
}
223
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
224
if(ret == -1){
225
perror_plus("clock_gettime");
226
return -1;
227
}
228
return 0;
256
229
}
257
230
258
231
/*
259
232
* Initialize GPGME.
260
233
*/
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
static bool init_gpgme(const char *seckey,
235
const char *pubkey, const char *tempdir){
266
236
gpgme_error_t rc;
267
237
gpgme_engine_info_t engine_info;
268
238
239
269
240
/*
270
241
* Helper function to insert pub and seckey to the engine keyring.
271
242
*/
272
bool import_key(const char * const filename){
243
bool import_key(const char *filename){
273
244
int ret;
274
245
int fd;
275
246
gpgme_data_t pgp_data;
282
253
283
254
rc = gpgme_data_new_from_fd(&pgp_data, fd);
284
255
if(rc != GPG_ERR_NO_ERROR){
285
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
258
gpgme_strsource(rc), gpgme_strerror(rc));
287
259
return false;
288
260
}
289
261
290
rc = gpgme_op_import(mc->ctx, pgp_data);
262
rc = gpgme_op_import(mc.ctx, pgp_data);
291
263
if(rc != GPG_ERR_NO_ERROR){
292
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
293
gpgme_strsource(rc), gpgme_strerror(rc));
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
294
267
return false;
295
268
}
296
269
303
276
}
304
277
305
278
if(debug){
306
fprintf_plus(stderr, "Initializing GPGME\n");
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
307
281
}
308
282
309
283
/* Init GPGME */
310
284
gpgme_check_version(NULL);
311
285
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
312
286
if(rc != GPG_ERR_NO_ERROR){
313
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
314
gpgme_strsource(rc), gpgme_strerror(rc));
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
289
gpgme_strsource(rc), gpgme_strerror(rc));
315
290
return false;
316
291
}
317
292
318
293
/* Set GPGME home directory for the OpenPGP engine only */
319
294
rc = gpgme_get_engine_info(&engine_info);
320
295
if(rc != GPG_ERR_NO_ERROR){
321
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
322
gpgme_strsource(rc), gpgme_strerror(rc));
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
323
299
return false;
324
300
}
325
301
while(engine_info != NULL){
331
307
engine_info = engine_info->next;
332
308
}
333
309
if(engine_info == NULL){
334
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
335
tempdir);
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"Could not set GPGME home dir to %s\n", tempdir);
336
312
return false;
337
313
}
338
314
339
315
/* Create new GPGME "context" */
340
rc = gpgme_new(&(mc->ctx));
316
rc = gpgme_new(&(mc.ctx));
341
317
if(rc != GPG_ERR_NO_ERROR){
342
fprintf_plus(stderr, "Mandos plugin mandos-client: "
343
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
344
gpgme_strerror(rc));
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
gpgme_strerror(rc));
345
321
return false;
346
322
}
347
323
356
332
* Decrypt OpenPGP data.
357
333
* Returns -1 on error
358
334
*/
359
__attribute__((nonnull, warn_unused_result))
360
335
static ssize_t pgp_packet_decrypt(const char *cryptotext,
361
336
size_t crypto_size,
362
char **plaintext,
363
mandos_context *mc){
337
char **plaintext){
364
338
gpgme_data_t dh_crypto, dh_plain;
365
339
gpgme_error_t rc;
366
340
ssize_t ret;
368
342
ssize_t plaintext_length = 0;
369
343
370
344
if(debug){
371
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
372
347
}
373
348
374
349
/* Create new GPGME data buffer from memory cryptotext */
375
350
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
376
351
0);
377
352
if(rc != GPG_ERR_NO_ERROR){
378
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
379
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
355
gpgme_strsource(rc), gpgme_strerror(rc));
380
356
return -1;
381
357
}
382
358
383
359
/* Create new empty GPGME data buffer for the plaintext */
384
360
rc = gpgme_data_new(&dh_plain);
385
361
if(rc != GPG_ERR_NO_ERROR){
386
fprintf_plus(stderr, "Mandos plugin mandos-client: "
387
"bad gpgme_data_new: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
389
365
gpgme_data_release(dh_crypto);
390
366
return -1;
391
367
}
392
368
393
369
/* Decrypt data from the cryptotext data buffer to the plaintext
394
370
data buffer */
395
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
396
372
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
398
gpgme_strsource(rc), gpgme_strerror(rc));
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
399
376
plaintext_length = -1;
400
377
if(debug){
401
378
gpgme_decrypt_result_t result;
402
result = gpgme_op_decrypt_result(mc->ctx);
379
result = gpgme_op_decrypt_result(mc.ctx);
403
380
if(result == NULL){
404
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
405
383
} else {
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);
384
fprintf(stderr, "Mandos plugin mandos-client: "
385
"Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf(stderr, "Mandos plugin mandos-client: "
388
"Wrong key usage: %u\n",
389
result->wrong_key_usage);
410
390
if(result->file_name != NULL){
411
fprintf_plus(stderr, "File name: %s\n", result->file_name);
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
412
393
}
413
394
gpgme_recipient_t recipient;
414
395
recipient = result->recipients;
415
396
while(recipient != NULL){
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");
397
fprintf(stderr, "Mandos plugin mandos-client: "
398
"Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name(recipient->pubkey_algo));
400
fprintf(stderr, "Mandos plugin mandos-client: "
401
"Key ID: %s\n", recipient->keyid);
402
fprintf(stderr, "Mandos plugin mandos-client: "
403
"Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
405
? "No" : "Yes");
423
406
recipient = recipient->next;
424
407
}
425
408
}
428
411
}
429
412
430
413
if(debug){
431
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
432
416
}
433
417
434
418
/* Seek back to the beginning of the GPGME plaintext data buffer */
441
425
*plaintext = NULL;
442
426
while(true){
443
427
plaintext_capacity = incbuffer(plaintext,
444
(size_t)plaintext_length,
445
plaintext_capacity);
428
(size_t)plaintext_length,
429
plaintext_capacity);
446
430
if(plaintext_capacity == 0){
447
perror_plus("incbuffer");
448
plaintext_length = -1;
449
goto decrypt_end;
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
450
434
}
451
435
452
436
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
465
449
}
466
450
467
451
if(debug){
468
fprintf_plus(stderr, "Decrypted password is: ");
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
469
454
for(ssize_t i = 0; i < plaintext_length; i++){
470
455
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
471
456
}
482
467
return plaintext_length;
483
468
}
484
469
485
__attribute__((warn_unused_result))
486
static const char *safer_gnutls_strerror(int value){
487
const char *ret = gnutls_strerror(value);
470
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value); /* Spurious warning from
472
-Wunreachable-code */
488
473
if(ret == NULL)
489
474
ret = "(unknown)";
490
475
return ret;
491
476
}
492
477
493
478
/* GnuTLS log function callback */
494
__attribute__((nonnull))
495
479
static void debuggnutls(__attribute__((unused)) int level,
496
480
const char* string){
497
fprintf_plus(stderr, "GnuTLS: %s", string);
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
498
482
}
499
483
500
__attribute__((nonnull, warn_unused_result))
501
484
static int init_gnutls_global(const char *pubkeyfilename,
502
const char *seckeyfilename,
503
mandos_context *mc){
485
const char *seckeyfilename){
504
486
int ret;
505
487
506
488
if(debug){
507
fprintf_plus(stderr, "Initializing GnuTLS\n");
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
508
491
}
509
492
510
493
ret = gnutls_global_init();
511
494
if(ret != GNUTLS_E_SUCCESS){
512
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
513
safer_gnutls_strerror(ret));
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
514
497
return -1;
515
498
}
516
499
523
506
}
524
507
525
508
/* OpenPGP credentials */
526
ret = gnutls_certificate_allocate_credentials(&mc->cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
527
510
if(ret != GNUTLS_E_SUCCESS){
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
529
safer_gnutls_strerror(ret));
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
530
513
gnutls_global_deinit();
531
514
return -1;
532
515
}
533
516
534
517
if(debug){
535
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
536
" secret key %s as GnuTLS credentials\n",
537
pubkeyfilename,
538
seckeyfilename);
518
fprintf(stderr, "Mandos plugin mandos-client: "
519
"Attempting to use OpenPGP public key %s and"
520
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
521
seckeyfilename);
539
522
}
540
523
541
524
ret = gnutls_certificate_set_openpgp_key_file
542
(mc->cred, pubkeyfilename, seckeyfilename,
525
(mc.cred, pubkeyfilename, seckeyfilename,
543
526
GNUTLS_OPENPGP_FMT_BASE64);
544
527
if(ret != GNUTLS_E_SUCCESS){
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));
528
fprintf(stderr,
529
"Mandos plugin mandos-client: "
530
"Error[%d] while reading the OpenPGP key pair ('%s',"
531
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
532
fprintf(stderr, "Mandos plugin mandos-client: "
533
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
550
534
goto globalfail;
551
535
}
552
536
553
537
/* GnuTLS server initialization */
554
ret = gnutls_dh_params_init(&mc->dh_params);
538
ret = gnutls_dh_params_init(&mc.dh_params);
555
539
if(ret != GNUTLS_E_SUCCESS){
556
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
557
" initialization: %s\n",
558
safer_gnutls_strerror(ret));
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
542
" %s\n", safer_gnutls_strerror(ret));
559
543
goto globalfail;
560
544
}
561
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
562
546
if(ret != GNUTLS_E_SUCCESS){
563
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
564
safer_gnutls_strerror(ret));
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
565
550
goto globalfail;
566
551
}
567
552
568
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
569
554
570
555
return 0;
571
556
572
557
globalfail:
573
558
574
gnutls_certificate_free_credentials(mc->cred);
559
gnutls_certificate_free_credentials(mc.cred);
575
560
gnutls_global_deinit();
576
gnutls_dh_params_deinit(mc->dh_params);
561
gnutls_dh_params_deinit(mc.dh_params);
577
562
return -1;
578
563
}
579
564
580
__attribute__((nonnull, warn_unused_result))
581
static int init_gnutls_session(gnutls_session_t *session,
582
mandos_context *mc){
565
static int init_gnutls_session(gnutls_session_t *session){
583
566
int ret;
584
567
/* GnuTLS session creation */
585
568
do {
589
572
}
590
573
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
591
574
if(ret != GNUTLS_E_SUCCESS){
592
fprintf_plus(stderr,
593
"Error in GnuTLS session initialization: %s\n",
594
safer_gnutls_strerror(ret));
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
577
safer_gnutls_strerror(ret));
595
578
}
596
579
597
580
{
598
581
const char *err;
599
582
do {
600
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
601
584
if(quit_now){
602
585
gnutls_deinit(*session);
603
586
return -1;
604
587
}
605
588
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
606
589
if(ret != GNUTLS_E_SUCCESS){
607
fprintf_plus(stderr, "Syntax error at: %s\n", err);
608
fprintf_plus(stderr, "GnuTLS error: %s\n",
609
safer_gnutls_strerror(ret));
590
fprintf(stderr, "Mandos plugin mandos-client: "
591
"Syntax error at: %s\n", err);
592
fprintf(stderr, "Mandos plugin mandos-client: "
593
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
610
594
gnutls_deinit(*session);
611
595
return -1;
612
596
}
614
598
615
599
do {
616
600
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
617
mc->cred);
601
mc.cred);
618
602
if(quit_now){
619
603
gnutls_deinit(*session);
620
604
return -1;
621
605
}
622
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
623
607
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
625
safer_gnutls_strerror(ret));
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
610
safer_gnutls_strerror(ret));
626
611
gnutls_deinit(*session);
627
612
return -1;
628
613
}
630
615
/* ignore client certificate if any. */
631
616
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
632
617
633
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
634
619
635
620
return 0;
636
621
}
640
625
__attribute__((unused)) const char *txt){}
641
626
642
627
/* Called when a Mandos server is found */
643
__attribute__((nonnull, warn_unused_result))
644
static int start_mandos_communication(const char *ip, in_port_t port,
628
static int start_mandos_communication(const char *ip, uint16_t port,
645
629
AvahiIfIndex if_index,
646
int af, mandos_context *mc){
630
int af){
647
631
int ret, tcp_sd = -1;
648
632
ssize_t sret;
649
struct sockaddr_storage to;
633
union {
634
struct sockaddr_in in;
635
struct sockaddr_in6 in6;
636
} to;
650
637
char *buffer = NULL;
651
638
char *decrypted_buffer = NULL;
652
639
size_t buffer_length = 0;
671
658
pf = PF_INET;
672
659
break;
673
660
default:
674
fprintf_plus(stderr, "Bad address family: %d\n", af);
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
675
663
errno = EINVAL;
676
664
return -1;
677
665
}
678
666
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);
667
ret = init_gnutls_session(&session);
712
668
if(ret != 0){
713
669
return -1;
714
670
}
715
671
716
672
if(debug){
717
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
718
PRIuMAX "\n", ip, (uintmax_t)port);
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
675
"\n", ip, port);
719
676
}
720
677
721
678
tcp_sd = socket(pf, SOCK_STREAM, 0);
733
690
734
691
memset(&to, 0, sizeof(to));
735
692
if(af == AF_INET6){
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
693
to.in6.sin6_family = (sa_family_t)af;
694
ret = inet_pton(af, ip, &to.in6.sin6_addr);
738
695
} else { /* IPv4 */
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
696
to.in.sin_family = (sa_family_t)af;
697
ret = inet_pton(af, ip, &to.in.sin_addr);
741
698
}
742
699
if(ret < 0 ){
743
700
int e = errno;
747
704
}
748
705
if(ret == 0){
749
706
int e = errno;
750
fprintf_plus(stderr, "Bad address: %s\n", ip);
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
751
709
errno = e;
752
710
goto mandos_end;
753
711
}
754
712
if(af == AF_INET6){
755
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
756
if(IN6_IS_ADDR_LINKLOCAL
757
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
713
to.in6.sin6_port = htons(port); /* Spurious warnings from
714
-Wconversion and
715
-Wunreachable-code */
716
717
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
718
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
719
-Wunreachable-code*/
758
720
if(if_index == AVAHI_IF_UNSPEC){
759
fprintf_plus(stderr, "An IPv6 link-local address is"
760
" incomplete without a network interface\n");
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
723
" without a network interface\n");
761
724
errno = EINVAL;
762
725
goto mandos_end;
763
726
}
764
727
/* Set the network interface number as scope */
765
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
728
to.in6.sin6_scope_id = (uint32_t)if_index;
766
729
}
767
730
} else {
768
((struct sockaddr_in *)&to)->sin_port = htons(port);
731
to.in.sin_port = htons(port); /* Spurious warnings from
732
-Wconversion and
733
-Wunreachable-code */
769
734
}
770
735
771
736
if(quit_now){
779
744
if(if_indextoname((unsigned int)if_index, interface) == NULL){
780
745
perror_plus("if_indextoname");
781
746
} else {
782
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
783
"\n", ip, interface, (uintmax_t)port);
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
784
750
}
785
751
} else {
786
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
787
ip, (uintmax_t)port);
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
788
754
}
789
755
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
790
756
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
757
const char *pcret;
791
758
if(af == AF_INET6){
792
ret = getnameinfo((struct sockaddr *)&to,
793
sizeof(struct sockaddr_in6),
794
addrstr, sizeof(addrstr), NULL, 0,
795
NI_NUMERICHOST);
759
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
760
sizeof(addrstr));
796
761
} else {
797
ret = getnameinfo((struct sockaddr *)&to,
798
sizeof(struct sockaddr_in),
799
addrstr, sizeof(addrstr), NULL, 0,
800
NI_NUMERICHOST);
762
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
763
sizeof(addrstr));
801
764
}
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);
765
if(pcret == NULL){
766
perror_plus("inet_ntop");
767
} else {
768
if(strcmp(addrstr, ip) != 0){
769
fprintf(stderr, "Mandos plugin mandos-client: "
770
"Canonical address form: %s\n", addrstr);
771
}
808
772
}
809
773
}
810
774
814
778
}
815
779
816
780
if(af == AF_INET6){
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
781
ret = connect(tcp_sd, &to.in6, sizeof(to));
819
782
} else {
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
822
784
}
823
785
if(ret < 0){
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
787
int e = errno;
826
788
perror_plus("connect");
827
789
errno = e;
839
801
while(true){
840
802
size_t out_size = strlen(out);
841
803
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
842
out_size - written));
804
out_size - written));
843
805
if(ret == -1){
844
806
int e = errno;
845
807
perror_plus("write");
865
827
}
866
828
867
829
if(debug){
868
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
869
832
}
870
833
871
834
if(quit_now){
873
836
goto mandos_end;
874
837
}
875
838
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);
839
/* Spurious warning from -Wint-to-pointer-cast */
840
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
881
841
882
842
if(quit_now){
883
843
errno = EINTR;
894
854
895
855
if(ret != GNUTLS_E_SUCCESS){
896
856
if(debug){
897
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
898
859
gnutls_perror(ret);
899
860
}
900
861
errno = EPROTO;
904
865
/* Read OpenPGP packet that contains the wanted password */
905
866
906
867
if(debug){
907
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
908
" %s\n", ip);
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
909
870
}
910
871
911
872
while(true){
916
877
}
917
878
918
879
buffer_capacity = incbuffer(&buffer, buffer_length,
919
buffer_capacity);
880
buffer_capacity);
920
881
if(buffer_capacity == 0){
921
882
int e = errno;
922
883
perror_plus("incbuffer");
949
910
}
950
911
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
951
912
if(ret < 0){
952
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
953
"***\n");
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
954
915
gnutls_perror(ret);
955
916
errno = EPROTO;
956
917
goto mandos_end;
957
918
}
958
919
break;
959
920
default:
960
fprintf_plus(stderr, "Unknown error while reading data from"
961
" encrypted session with Mandos server\n");
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
923
" encrypted session with Mandos server\n");
962
924
gnutls_bye(session, GNUTLS_SHUT_RDWR);
963
925
errno = EIO;
964
926
goto mandos_end;
969
931
}
970
932
971
933
if(debug){
972
fprintf_plus(stderr, "Closing TLS session\n");
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
973
936
}
974
937
975
938
if(quit_now){
987
950
988
951
if(buffer_length > 0){
989
952
ssize_t decrypted_buffer_size;
990
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
991
&decrypted_buffer, mc);
953
decrypted_buffer_size = pgp_packet_decrypt(buffer,
954
buffer_length,
955
&decrypted_buffer);
992
956
if(decrypted_buffer_size >= 0){
993
957
994
958
written = 0;
1004
968
if(ret == 0 and ferror(stdout)){
1005
969
int e = errno;
1006
970
if(debug){
1007
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1008
strerror(errno));
971
fprintf(stderr, "Mandos plugin mandos-client: "
972
"Error writing encrypted data: %s\n",
973
strerror(errno));
1009
974
}
1010
975
errno = e;
1011
976
goto mandos_end;
1042
1007
return retval;
1043
1008
}
1044
1009
1045
__attribute__((nonnull))
1046
1010
static void resolve_callback(AvahiSServiceResolver *r,
1047
1011
AvahiIfIndex interface,
1048
1012
AvahiProtocol proto,
1056
1020
AVAHI_GCC_UNUSED AvahiStringList *txt,
1057
1021
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1058
1022
flags,
1059
void *mc){
1060
if(r == NULL){
1061
return;
1062
}
1023
AVAHI_GCC_UNUSED void* userdata){
1024
assert(r);
1063
1025
1064
1026
/* Called whenever a service has been resolved successfully or
1065
1027
timed out */
1071
1033
switch(event){
1072
1034
default:
1073
1035
case AVAHI_RESOLVER_FAILURE:
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)));
1036
fprintf(stderr, "Mandos plugin mandos-client: "
1037
"(Avahi Resolver) Failed to resolve service '%s'"
1038
" of type '%s' in domain '%s': %s\n", name, type, domain,
1039
avahi_strerror(avahi_server_errno(mc.server)));
1079
1040
break;
1080
1041
1081
1042
case AVAHI_RESOLVER_FOUND:
1083
1044
char ip[AVAHI_ADDRESS_STR_MAX];
1084
1045
avahi_address_snprint(ip, sizeof(ip), address);
1085
1046
if(debug){
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);
1047
fprintf(stderr, "Mandos plugin mandos-client: "
1048
"Mandos server \"%s\" found on %s (%s, %"
1049
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1050
ip, (intmax_t)interface, port);
1089
1051
}
1090
int ret = start_mandos_communication(ip, (in_port_t)port,
1091
interface,
1092
avahi_proto_to_af(proto),
1093
mc);
1052
int ret = start_mandos_communication(ip, port, interface,
1053
avahi_proto_to_af(proto));
1094
1054
if(ret == 0){
1095
avahi_simple_poll_quit(simple_poll);
1055
avahi_simple_poll_quit(mc.simple_poll);
1096
1056
} else {
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
}
1057
ret = add_server(ip, port, interface,
1058
avahi_proto_to_af(proto));
1103
1059
}
1104
1060
}
1105
1061
}
1115
1071
const char *domain,
1116
1072
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1117
1073
flags,
1118
void *mc){
1119
if(b == NULL){
1120
return;
1121
}
1074
AVAHI_GCC_UNUSED void* userdata){
1075
assert(b);
1122
1076
1123
1077
/* Called whenever a new services becomes available on the LAN or
1124
1078
is removed from the LAN */
1131
1085
default:
1132
1086
case AVAHI_BROWSER_FAILURE:
1133
1087
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);
1088
fprintf(stderr, "Mandos plugin mandos-client: "
1089
"(Avahi browser) %s\n",
1090
avahi_strerror(avahi_server_errno(mc.server)));
1091
avahi_simple_poll_quit(mc.simple_poll);
1138
1092
return;
1139
1093
1140
1094
case AVAHI_BROWSER_NEW:
1143
1097
the callback function is called the Avahi server will free the
1144
1098
resolver for us. */
1145
1099
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)));
1100
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1101
name, type, domain, protocol, 0,
1102
resolve_callback, NULL) == NULL)
1103
fprintf(stderr, "Mandos plugin mandos-client: "
1104
"Avahi: Failed to resolve service '%s': %s\n",
1105
name, avahi_strerror(avahi_server_errno(mc.server)));
1154
1106
break;
1155
1107
1156
1108
case AVAHI_BROWSER_REMOVE:
1159
1111
case AVAHI_BROWSER_ALL_FOR_NOW:
1160
1112
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1161
1113
if(debug){
1162
fprintf_plus(stderr, "No Mandos server found, still"
1163
" searching...\n");
1114
fprintf(stderr, "Mandos plugin mandos-client: "
1115
"No Mandos server found, still searching...\n");
1164
1116
}
1165
1117
break;
1166
1118
}
1175
1127
signal_received = sig;
1176
1128
int old_errno = errno;
1177
1129
/* set main loop to exit */
1178
if(simple_poll != NULL){
1179
avahi_simple_poll_quit(simple_poll);
1130
if(mc.simple_poll != NULL){
1131
avahi_simple_poll_quit(mc.simple_poll);
1180
1132
}
1181
1133
errno = old_errno;
1182
1134
}
1183
1135
1184
__attribute__((nonnull, warn_unused_result))
1185
1136
bool get_flags(const char *ifname, struct ifreq *ifr){
1186
1137
int ret;
1187
error_t ret_errno;
1188
1138
1189
1139
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1190
1140
if(s < 0){
1191
ret_errno = errno;
1192
1141
perror_plus("socket");
1193
errno = ret_errno;
1194
1142
return false;
1195
1143
}
1196
1144
strcpy(ifr->ifr_name, ifname);
1197
1145
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1198
1146
if(ret == -1){
1199
1147
if(debug){
1200
ret_errno = errno;
1201
1148
perror_plus("ioctl SIOCGIFFLAGS");
1202
errno = ret_errno;
1203
1149
}
1204
1150
return false;
1205
1151
}
1206
1152
return true;
1207
1153
}
1208
1154
1209
__attribute__((nonnull, warn_unused_result))
1210
1155
bool good_flags(const char *ifname, const struct ifreq *ifr){
1211
1156
1212
1157
/* Reject the loopback device */
1213
1158
if(ifr->ifr_flags & IFF_LOOPBACK){
1214
1159
if(debug){
1215
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1216
ifname);
1160
fprintf(stderr, "Mandos plugin mandos-client: "
1161
"Rejecting loopback interface \"%s\"\n", ifname);
1217
1162
}
1218
1163
return false;
1219
1164
}
1220
1165
/* Accept point-to-point devices only if connect_to is specified */
1221
1166
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1222
1167
if(debug){
1223
fprintf_plus(stderr, "Accepting point-to-point interface"
1224
" \"%s\"\n", ifname);
1168
fprintf(stderr, "Mandos plugin mandos-client: "
1169
"Accepting point-to-point interface \"%s\"\n", ifname);
1225
1170
}
1226
1171
return true;
1227
1172
}
1228
1173
/* Otherwise, reject non-broadcast-capable devices */
1229
1174
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1230
1175
if(debug){
1231
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1232
" \"%s\"\n", ifname);
1176
fprintf(stderr, "Mandos plugin mandos-client: "
1177
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1233
1178
}
1234
1179
return false;
1235
1180
}
1236
1181
/* Reject non-ARP interfaces (including dummy interfaces) */
1237
1182
if(ifr->ifr_flags & IFF_NOARP){
1238
1183
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1240
ifname);
1184
fprintf(stderr, "Mandos plugin mandos-client: "
1185
"Rejecting non-ARP interface \"%s\"\n", ifname);
1241
1186
}
1242
1187
return false;
1243
1188
}
1244
1189
1245
1190
/* Accept this device */
1246
1191
if(debug){
1247
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1192
fprintf(stderr, "Mandos plugin mandos-client: "
1193
"Interface \"%s\" is good\n", ifname);
1248
1194
}
1249
1195
return true;
1250
1196
}
1254
1200
* corresponds to an acceptable network device.
1255
1201
* (This function is passed to scandir(3) as a filter function.)
1256
1202
*/
1257
__attribute__((nonnull, warn_unused_result))
1258
1203
int good_interface(const struct dirent *if_entry){
1259
1204
if(if_entry->d_name[0] == '.'){
1260
1205
return 0;
1263
1208
struct ifreq ifr;
1264
1209
if(not get_flags(if_entry->d_name, &ifr)){
1265
1210
if(debug){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", if_entry->d_name);
1268
}
1269
return 0;
1270
}
1271
1272
if(not good_flags(if_entry->d_name, &ifr)){
1273
return 0;
1274
}
1275
return 1;
1276
}
1277
1278
/*
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))
1211
fprintf(stderr, "Mandos plugin mandos-client: "
1212
"Failed to get flags for interface \"%s\"\n",
1213
if_entry->d_name);
1214
}
1215
return 0;
1216
}
1217
1218
if(not good_flags(if_entry->d_name, &ifr)){
1219
return 0;
1220
}
1221
return 1;
1222
}
1223
1224
/*
1225
* This function determines if a directory entry in /sys/class/net
1226
* corresponds to an acceptable network device which is up.
1227
* (This function is passed to scandir(3) as a filter function.)
1228
*/
1229
int up_interface(const struct dirent *if_entry){
1230
if(if_entry->d_name[0] == '.'){
1231
return 0;
1232
}
1233
1234
struct ifreq ifr;
1235
if(not get_flags(if_entry->d_name, &ifr)){
1236
if(debug){
1237
fprintf(stderr, "Mandos plugin mandos-client: "
1238
"Failed to get flags for interface \"%s\"\n",
1239
if_entry->d_name);
1240
}
1241
return 0;
1242
}
1243
1244
/* Reject down interfaces */
1245
if(not (ifr.ifr_flags & IFF_UP)){
1246
if(debug){
1247
fprintf(stderr, "Mandos plugin mandos-client: "
1248
"Rejecting down interface \"%s\"\n",
1249
if_entry->d_name);
1250
}
1251
return 0;
1252
}
1253
1254
/* Reject non-running interfaces */
1255
if(not (ifr.ifr_flags & IFF_RUNNING)){
1256
if(debug){
1257
fprintf(stderr, "Mandos plugin mandos-client: "
1258
"Rejecting non-running interface \"%s\"\n",
1259
if_entry->d_name);
1260
}
1261
return 0;
1262
}
1263
1264
if(not good_flags(if_entry->d_name, &ifr)){
1265
return 0;
1266
}
1267
return 1;
1268
}
1269
1313
1270
int notdotentries(const struct dirent *direntry){
1314
1271
/* Skip "." and ".." */
1315
1272
if(direntry->d_name[0] == '.'
1322
1279
}
1323
1280
1324
1281
/* Is this directory entry a runnable program? */
1325
__attribute__((nonnull, warn_unused_result))
1326
1282
int runnable_hook(const struct dirent *direntry){
1327
1283
int ret;
1328
size_t sret;
1329
1284
struct stat st;
1330
1285
1331
1286
if((direntry->d_name)[0] == '\0'){
1333
1288
return 0;
1334
1289
}
1335
1290
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
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1291
/* Save pointer to last character */
1292
char *end = strchr(direntry->d_name, '\0')-1;
1293
1294
if(*end == '~'){
1295
/* Backup name~ */
1296
return 0;
1297
}
1298
1299
if(((direntry->d_name)[0] == '#')
1300
and (*end == '#')){
1301
/* Temporary #name# */
1302
return 0;
1303
}
1304
1305
/* XXX more rules here */
1306
1307
ret = stat(direntry->d_name, &st);
1350
1308
if(ret == -1){
1351
1309
if(debug){
1352
perror_plus("Could not stat hook");
1310
perror_plus("Could not stat plugin");
1353
1311
}
1354
1312
return 0;
1355
1313
}
1356
1314
if(not (S_ISREG(st.st_mode))){
1357
1315
/* Not a regular file */
1358
if(debug){
1359
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1360
direntry->d_name);
1361
}
1362
1316
return 0;
1363
1317
}
1364
1318
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1365
1319
/* Not executable */
1366
if(debug){
1367
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1368
direntry->d_name);
1369
}
1370
1320
return 0;
1371
1321
}
1372
if(debug){
1373
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1374
direntry->d_name);
1375
}
1376
1322
return 1;
1377
1323
}
1378
1324
1379
__attribute__((nonnull, warn_unused_result))
1380
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1381
mandos_context *mc){
1325
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1382
1326
int ret;
1383
1327
struct timespec now;
1384
1328
struct timespec waited_time;
1385
1329
intmax_t block_time;
1386
1330
1387
1331
while(true){
1388
if(mc->current_server == NULL){
1389
if(debug){
1390
fprintf_plus(stderr, "Wait until first server is found."
1391
" No timeout!\n");
1332
if(mc.current_server == NULL){
1333
if (debug){
1334
fprintf(stderr, "Mandos plugin mandos-client: "
1335
"Wait until first server is found. No timeout!\n");
1392
1336
}
1393
1337
ret = avahi_simple_poll_iterate(s, -1);
1394
1338
} else {
1395
if(debug){
1396
fprintf_plus(stderr, "Check current_server if we should run"
1397
" it, or wait\n");
1339
if (debug){
1340
fprintf(stderr, "Mandos plugin mandos-client: "
1341
"Check current_server if we should run it,"
1342
" or wait\n");
1398
1343
}
1399
1344
/* the current time */
1400
1345
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1405
1350
/* Calculating in ms how long time between now and server
1406
1351
who we visted longest time ago. Now - last seen. */
1407
1352
waited_time.tv_sec = (now.tv_sec
1408
- mc->current_server->last_seen.tv_sec);
1353
- mc.current_server->last_seen.tv_sec);
1409
1354
waited_time.tv_nsec = (now.tv_nsec
1410
- mc->current_server->last_seen.tv_nsec);
1355
- mc.current_server->last_seen.tv_nsec);
1411
1356
/* total time is 10s/10,000ms.
1412
1357
Converting to s from ms by dividing by 1,000,
1413
1358
and ns to ms by dividing by 1,000,000. */
1415
1360
- ((intmax_t)waited_time.tv_sec * 1000))
1416
1361
- ((intmax_t)waited_time.tv_nsec / 1000000));
1417
1362
1418
if(debug){
1419
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1420
block_time);
1363
if (debug){
1364
fprintf(stderr, "Mandos plugin mandos-client: "
1365
"Blocking for %" PRIdMAX " ms\n", block_time);
1421
1366
}
1422
1367
1423
1368
if(block_time <= 0){
1424
ret = start_mandos_communication(mc->current_server->ip,
1425
mc->current_server->port,
1426
mc->current_server->if_index,
1427
mc->current_server->af, mc);
1369
ret = start_mandos_communication(mc.current_server->ip,
1370
mc.current_server->port,
1371
mc.current_server->if_index,
1372
mc.current_server->af);
1428
1373
if(ret == 0){
1429
avahi_simple_poll_quit(s);
1374
avahi_simple_poll_quit(mc.simple_poll);
1430
1375
return 0;
1431
1376
}
1432
1377
ret = clock_gettime(CLOCK_MONOTONIC,
1433
&mc->current_server->last_seen);
1378
&mc.current_server->last_seen);
1434
1379
if(ret == -1){
1435
1380
perror_plus("clock_gettime");
1436
1381
return -1;
1437
1382
}
1438
mc->current_server = mc->current_server->next;
1383
mc.current_server = mc.current_server->next;
1439
1384
block_time = 0; /* Call avahi to find new Mandos
1440
1385
servers, but don't block */
1441
1386
}
1443
1388
ret = avahi_simple_poll_iterate(s, (int)block_time);
1444
1389
}
1445
1390
if(ret != 0){
1446
if(ret > 0 or errno != EINTR){
1391
if (ret > 0 or errno != EINTR){
1447
1392
return (ret != 1) ? ret : 0;
1448
1393
}
1449
1394
}
1450
1395
}
1451
1396
}
1452
1397
1453
/* Set effective uid to 0, return errno */
1454
__attribute__((warn_unused_result))
1455
error_t raise_privileges(void){
1456
error_t old_errno = errno;
1457
error_t ret_errno = 0;
1458
if(seteuid(0) == -1){
1459
ret_errno = errno;
1460
perror_plus("seteuid");
1461
}
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
1466
/* Set effective and real user ID to 0. Return errno. */
1467
__attribute__((warn_unused_result))
1468
error_t raise_privileges_permanently(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = raise_privileges();
1471
if(ret_errno != 0){
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
if(setuid(0) == -1){
1476
ret_errno = errno;
1477
perror_plus("seteuid");
1478
}
1479
errno = old_errno;
1480
return ret_errno;
1481
}
1482
1483
/* Set effective user ID to unprivileged saved user ID */
1484
__attribute__((warn_unused_result))
1485
error_t lower_privileges(void){
1486
error_t old_errno = errno;
1487
error_t ret_errno = 0;
1488
if(seteuid(uid) == -1){
1489
ret_errno = errno;
1490
perror_plus("seteuid");
1491
}
1492
errno = old_errno;
1493
return ret_errno;
1494
}
1495
1496
/* Lower privileges permanently */
1497
__attribute__((warn_unused_result))
1498
error_t lower_privileges_permanently(void){
1499
error_t old_errno = errno;
1500
error_t ret_errno = 0;
1501
if(setuid(uid) == -1){
1502
ret_errno = errno;
1503
perror_plus("setuid");
1504
}
1505
errno = old_errno;
1506
return ret_errno;
1507
}
1508
1509
#ifndef O_CLOEXEC
1510
/*
1511
* Based on the example in the GNU LibC manual chapter 13.13 "File
1512
* Descriptor Flags".
1513
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1514
*/
1515
__attribute__((warn_unused_result))
1516
static int set_cloexec_flag(int fd){
1517
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1518
/* If reading the flags failed, return error indication now. */
1519
if(ret < 0){
1520
return ret;
1521
}
1522
/* Store modified flag word in the descriptor. */
1523
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1524
ret | FD_CLOEXEC));
1525
}
1526
#endif /* not O_CLOEXEC */
1527
1528
__attribute__((nonnull))
1529
void run_network_hooks(const char *mode, const char *interface,
1530
const float delay){
1531
struct dirent **direntries;
1532
if(hookdir_fd == -1){
1533
hookdir_fd = open(hookdir, O_RDONLY |
1534
#ifdef O_CLOEXEC
1535
O_CLOEXEC
1536
#else /* not O_CLOEXEC */
1537
0
1538
#endif /* not O_CLOEXEC */
1539
);
1540
if(hookdir_fd == -1){
1541
if(errno == ENOENT){
1542
if(debug){
1543
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1544
" found\n", hookdir);
1545
}
1546
} else {
1547
perror_plus("open");
1548
}
1549
return;
1550
}
1551
#ifndef O_CLOEXEC
1552
if(set_cloexec_flag(hookdir_fd) < 0){
1553
perror_plus("set_cloexec_flag");
1554
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1555
perror_plus("close");
1556
} else {
1557
hookdir_fd = -1;
1558
}
1559
return;
1560
}
1561
#endif /* not O_CLOEXEC */
1562
}
1563
#ifdef __GLIBC__
1564
#if __GLIBC_PREREQ(2, 15)
1565
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1566
runnable_hook, alphasort);
1567
#else /* not __GLIBC_PREREQ(2, 15) */
1568
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1569
alphasort);
1570
#endif /* not __GLIBC_PREREQ(2, 15) */
1571
#else /* not __GLIBC__ */
1572
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1573
alphasort);
1574
#endif /* not __GLIBC__ */
1575
if(numhooks == -1){
1576
perror_plus("scandir");
1577
return;
1578
}
1579
struct dirent *direntry;
1580
int ret;
1581
int devnull = open("/dev/null", O_RDONLY);
1582
for(int i = 0; i < numhooks; i++){
1583
direntry = direntries[i];
1584
if(debug){
1585
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1586
direntry->d_name);
1587
}
1588
pid_t hook_pid = fork();
1589
if(hook_pid == 0){
1590
/* Child */
1591
/* Raise privileges */
1592
if(raise_privileges_permanently() != 0){
1593
perror_plus("Failed to raise privileges");
1594
_exit(EX_NOPERM);
1595
}
1596
/* Set group */
1597
errno = 0;
1598
ret = setgid(0);
1599
if(ret == -1){
1600
perror_plus("setgid");
1601
_exit(EX_NOPERM);
1602
}
1603
/* Reset supplementary groups */
1604
errno = 0;
1605
ret = setgroups(0, NULL);
1606
if(ret == -1){
1607
perror_plus("setgroups");
1608
_exit(EX_NOPERM);
1609
}
1610
ret = dup2(devnull, STDIN_FILENO);
1611
if(ret == -1){
1612
perror_plus("dup2(devnull, STDIN_FILENO)");
1613
_exit(EX_OSERR);
1614
}
1615
ret = close(devnull);
1616
if(ret == -1){
1617
perror_plus("close");
1618
_exit(EX_OSERR);
1619
}
1620
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1621
if(ret == -1){
1622
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1623
_exit(EX_OSERR);
1624
}
1625
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1626
if(ret == -1){
1627
perror_plus("setenv");
1628
_exit(EX_OSERR);
1629
}
1630
ret = setenv("DEVICE", interface, 1);
1631
if(ret == -1){
1632
perror_plus("setenv");
1633
_exit(EX_OSERR);
1634
}
1635
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1636
if(ret == -1){
1637
perror_plus("setenv");
1638
_exit(EX_OSERR);
1639
}
1640
ret = setenv("MODE", mode, 1);
1641
if(ret == -1){
1642
perror_plus("setenv");
1643
_exit(EX_OSERR);
1644
}
1645
char *delaystring;
1646
ret = asprintf(&delaystring, "%f", (double)delay);
1647
if(ret == -1){
1648
perror_plus("asprintf");
1649
_exit(EX_OSERR);
1650
}
1651
ret = setenv("DELAY", delaystring, 1);
1652
if(ret == -1){
1653
free(delaystring);
1654
perror_plus("setenv");
1655
_exit(EX_OSERR);
1656
}
1657
free(delaystring);
1658
if(connect_to != NULL){
1659
ret = setenv("CONNECT", connect_to, 1);
1660
if(ret == -1){
1661
perror_plus("setenv");
1662
_exit(EX_OSERR);
1663
}
1664
}
1665
if(fexecve(hookdir_fd, (char *const [])
1666
{ direntry->d_name, NULL }, environ) == -1){
1667
perror_plus("fexecve");
1668
_exit(EXIT_FAILURE);
1669
}
1670
} else {
1671
int status;
1672
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1673
perror_plus("waitpid");
1674
continue;
1675
}
1676
if(WIFEXITED(status)){
1677
if(WEXITSTATUS(status) != 0){
1678
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1679
" with status %d\n", direntry->d_name,
1680
WEXITSTATUS(status));
1681
continue;
1682
}
1683
} else if(WIFSIGNALED(status)){
1684
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1685
" signal %d\n", direntry->d_name,
1686
WTERMSIG(status));
1687
continue;
1688
} else {
1689
fprintf_plus(stderr, "Warning: network hook \"%s\""
1690
" crashed\n", direntry->d_name);
1691
continue;
1692
}
1693
}
1694
if(debug){
1695
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1696
direntry->d_name);
1697
}
1698
}
1699
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1700
perror_plus("close");
1701
} else {
1702
hookdir_fd = -1;
1703
}
1704
close(devnull);
1705
}
1706
1707
__attribute__((nonnull, warn_unused_result))
1708
error_t bring_up_interface(const char *const interface,
1709
const float delay){
1710
error_t old_errno = errno;
1711
int ret;
1712
struct ifreq network;
1713
unsigned int if_index = if_nametoindex(interface);
1714
if(if_index == 0){
1715
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1716
errno = old_errno;
1717
return ENXIO;
1718
}
1719
1720
if(quit_now){
1721
errno = old_errno;
1722
return EINTR;
1723
}
1724
1725
if(not interface_is_up(interface)){
1726
error_t ret_errno = 0, ioctl_errno = 0;
1727
if(not get_flags(interface, &network)){
1728
ret_errno = errno;
1729
fprintf_plus(stderr, "Failed to get flags for interface "
1730
"\"%s\"\n", interface);
1731
errno = old_errno;
1732
return ret_errno;
1733
}
1734
network.ifr_flags |= IFF_UP; /* set flag */
1735
1736
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1737
if(sd == -1){
1738
ret_errno = errno;
1739
perror_plus("socket");
1740
errno = old_errno;
1741
return ret_errno;
1742
}
1743
1744
if(quit_now){
1745
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1746
if(ret == -1){
1747
perror_plus("close");
1748
}
1749
errno = old_errno;
1750
return EINTR;
1751
}
1752
1753
if(debug){
1754
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1755
interface);
1756
}
1757
1758
/* Raise privileges */
1759
ret_errno = raise_privileges();
1760
if(ret_errno != 0){
1761
perror_plus("Failed to raise privileges");
1762
}
1763
1764
#ifdef __linux__
1765
int ret_linux;
1766
bool restore_loglevel = false;
1767
if(ret_errno == 0){
1768
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1769
messages about the network interface to mess up the prompt */
1770
ret_linux = klogctl(8, NULL, 5);
1771
if(ret_linux == -1){
1772
perror_plus("klogctl");
1773
} else {
1774
restore_loglevel = true;
1775
}
1776
}
1777
#endif /* __linux__ */
1778
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1779
ioctl_errno = errno;
1780
#ifdef __linux__
1781
if(restore_loglevel){
1782
ret_linux = klogctl(7, NULL, 0);
1783
if(ret_linux == -1){
1784
perror_plus("klogctl");
1785
}
1786
}
1787
#endif /* __linux__ */
1788
1789
/* If raise_privileges() succeeded above */
1790
if(ret_errno == 0){
1791
/* Lower privileges */
1792
ret_errno = lower_privileges();
1793
if(ret_errno != 0){
1794
errno = ret_errno;
1795
perror_plus("Failed to lower privileges");
1796
}
1797
}
1798
1799
/* Close the socket */
1800
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1801
if(ret == -1){
1802
perror_plus("close");
1803
}
1804
1805
if(ret_setflags == -1){
1806
errno = ioctl_errno;
1807
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1808
errno = old_errno;
1809
return ioctl_errno;
1810
}
1811
} else if(debug){
1812
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1813
interface);
1814
}
1815
1816
/* Sleep checking until interface is running.
1817
Check every 0.25s, up to total time of delay */
1818
for(int i=0; i < delay * 4; i++){
1819
if(interface_is_running(interface)){
1820
break;
1821
}
1822
struct timespec sleeptime = { .tv_nsec = 250000000 };
1823
ret = nanosleep(&sleeptime, NULL);
1824
if(ret == -1 and errno != EINTR){
1825
perror_plus("nanosleep");
1826
}
1827
}
1828
1829
errno = old_errno;
1830
return 0;
1831
}
1832
1833
__attribute__((nonnull, warn_unused_result))
1834
error_t take_down_interface(const char *const interface){
1835
error_t old_errno = errno;
1836
struct ifreq network;
1837
unsigned int if_index = if_nametoindex(interface);
1838
if(if_index == 0){
1839
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1840
errno = old_errno;
1841
return ENXIO;
1842
}
1843
if(interface_is_up(interface)){
1844
error_t ret_errno = 0, ioctl_errno = 0;
1845
if(not get_flags(interface, &network) and debug){
1846
ret_errno = errno;
1847
fprintf_plus(stderr, "Failed to get flags for interface "
1848
"\"%s\"\n", interface);
1849
errno = old_errno;
1850
return ret_errno;
1851
}
1852
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1853
1854
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1855
if(sd == -1){
1856
ret_errno = errno;
1857
perror_plus("socket");
1858
errno = old_errno;
1859
return ret_errno;
1860
}
1861
1862
if(debug){
1863
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1864
interface);
1865
}
1866
1867
/* Raise privileges */
1868
ret_errno = raise_privileges();
1869
if(ret_errno != 0){
1870
perror_plus("Failed to raise privileges");
1871
}
1872
1873
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1874
ioctl_errno = errno;
1875
1876
/* If raise_privileges() succeeded above */
1877
if(ret_errno == 0){
1878
/* Lower privileges */
1879
ret_errno = lower_privileges();
1880
if(ret_errno != 0){
1881
errno = ret_errno;
1882
perror_plus("Failed to lower privileges");
1883
}
1884
}
1885
1886
/* Close the socket */
1887
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1888
if(ret == -1){
1889
perror_plus("close");
1890
}
1891
1892
if(ret_setflags == -1){
1893
errno = ioctl_errno;
1894
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1895
errno = old_errno;
1896
return ioctl_errno;
1897
}
1898
} else if(debug){
1899
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1900
interface);
1901
}
1902
1903
errno = old_errno;
1904
return 0;
1905
}
1906
1907
1398
int main(int argc, char *argv[]){
1908
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1909
.priority = "SECURE256:!CTYPE-X.509:"
1910
"+CTYPE-OPENPGP", .current_server = NULL,
1911
.interfaces = NULL, .interfaces_size = 0 };
1912
1399
AvahiSServiceBrowser *sb = NULL;
1913
error_t ret_errno;
1400
int error;
1914
1401
int ret;
1915
1402
intmax_t tmpmax;
1916
1403
char *tmp;
1917
1404
int exitcode = EXIT_SUCCESS;
1918
char *interfaces_to_take_down = NULL;
1919
size_t interfaces_to_take_down_size = 0;
1920
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1921
char old_tempdir[] = "/tmp/mandosXXXXXX";
1922
char *tempdir = NULL;
1405
const char *interface = "";
1406
struct ifreq network;
1407
int sd = -1;
1408
bool take_down_interface = false;
1409
uid_t uid;
1410
gid_t gid;
1411
char tempdir[] = "/tmp/mandosXXXXXX";
1412
bool tempdir_created = false;
1923
1413
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1924
1414
const char *seckey = PATHDIR "/" SECKEY;
1925
1415
const char *pubkey = PATHDIR "/" PUBKEY;
1926
char *interfaces_hooks = NULL;
1927
1416
1928
1417
bool gnutls_initialized = false;
1929
1418
bool gpgme_initialized = false;
1991
1480
.group = 2 },
1992
1481
{ .name = "retry", .key = 132,
1993
1482
.arg = "SECONDS",
1994
.doc = "Retry interval used when denied by the Mandos server",
1995
.group = 2 },
1996
{ .name = "network-hook-dir", .key = 133,
1997
.arg = "DIR",
1998
.doc = "Directory where network hooks are located",
1483
.doc = "Retry interval used when denied by the mandos server",
1999
1484
.group = 2 },
2000
1485
/*
2001
1486
* These reproduce what we would get without ARGP_NO_HELP
2020
1505
connect_to = arg;
2021
1506
break;
2022
1507
case 'i': /* --interface */
2023
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2024
arg, (int)',');
2025
if(ret_errno != 0){
2026
argp_error(state, "%s", strerror(ret_errno));
2027
}
1508
interface = arg;
2028
1509
break;
2029
1510
case 's': /* --seckey */
2030
1511
seckey = arg;
2059
1540
argp_error(state, "Bad retry interval");
2060
1541
}
2061
1542
break;
2062
case 133: /* --network-hook-dir */
2063
hookdir = arg;
2064
break;
2065
1543
/*
2066
1544
* These reproduce what we would get without ARGP_NO_HELP
2067
1545
*/
2073
1551
argp_state_help(state, state->out_stream,
2074
1552
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2075
1553
case 'V': /* --version */
2076
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1554
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1555
fprintf(state->out_stream, "%s\n", argp_program_version);
2077
1556
exit(argp_err_exit_status);
2078
1557
break;
2079
1558
default:
2106
1585
{
2107
1586
/* Work around Debian bug #633582:
2108
1587
<http://bugs.debian.org/633582> */
2109
2110
/* Re-raise privileges */
2111
ret_errno = raise_privileges();
2112
if(ret_errno != 0){
2113
errno = ret_errno;
2114
perror_plus("Failed to raise privileges");
1588
struct stat st;
1589
1590
/* Re-raise priviliges */
1591
errno = 0;
1592
ret = seteuid(0);
1593
if(ret == -1){
1594
perror_plus("seteuid");
1595
}
1596
1597
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1598
int seckey_fd = open(seckey, O_RDONLY);
1599
if(seckey_fd == -1){
1600
perror_plus("open");
1601
} else {
1602
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1603
if(ret == -1){
1604
perror_plus("fstat");
1605
} else {
1606
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1607
ret = fchown(seckey_fd, uid, gid);
1608
if(ret == -1){
1609
perror_plus("fchown");
1610
}
1611
}
1612
}
1613
TEMP_FAILURE_RETRY(close(seckey_fd));
1614
}
1615
}
1616
1617
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1618
int pubkey_fd = open(pubkey, O_RDONLY);
1619
if(pubkey_fd == -1){
1620
perror_plus("open");
1621
} else {
1622
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1623
if(ret == -1){
1624
perror_plus("fstat");
1625
} else {
1626
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1627
ret = fchown(pubkey_fd, uid, gid);
1628
if(ret == -1){
1629
perror_plus("fchown");
1630
}
1631
}
1632
}
1633
TEMP_FAILURE_RETRY(close(pubkey_fd));
1634
}
1635
}
1636
1637
/* Lower privileges */
1638
errno = 0;
1639
ret = seteuid(uid);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
}
1644
1645
/* Find network hooks and run them */
1646
{
1647
struct dirent **direntries;
1648
struct dirent *direntry;
1649
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1650
alphasort);
1651
if(numhooks == -1){
1652
perror_plus("scandir");
2115
1653
} else {
2116
struct stat st;
2117
2118
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2119
int seckey_fd = open(seckey, O_RDONLY);
2120
if(seckey_fd == -1){
2121
perror_plus("open");
2122
} else {
2123
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2124
if(ret == -1){
2125
perror_plus("fstat");
2126
} else {
2127
if(S_ISREG(st.st_mode)
2128
and st.st_uid == 0 and st.st_gid == 0){
2129
ret = fchown(seckey_fd, uid, gid);
2130
if(ret == -1){
2131
perror_plus("fchown");
2132
}
2133
}
2134
}
2135
TEMP_FAILURE_RETRY(close(seckey_fd));
2136
}
2137
}
2138
2139
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2140
int pubkey_fd = open(pubkey, O_RDONLY);
2141
if(pubkey_fd == -1){
2142
perror_plus("open");
2143
} else {
2144
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2145
if(ret == -1){
2146
perror_plus("fstat");
2147
} else {
2148
if(S_ISREG(st.st_mode)
2149
and st.st_uid == 0 and st.st_gid == 0){
2150
ret = fchown(pubkey_fd, uid, gid);
2151
if(ret == -1){
2152
perror_plus("fchown");
2153
}
2154
}
2155
}
2156
TEMP_FAILURE_RETRY(close(pubkey_fd));
2157
}
2158
}
2159
2160
/* Lower privileges */
2161
ret_errno = lower_privileges();
2162
if(ret_errno != 0){
2163
errno = ret_errno;
2164
perror_plus("Failed to lower privileges");
2165
}
2166
}
2167
}
2168
2169
/* Remove invalid interface names (except "none") */
2170
{
2171
char *interface = NULL;
2172
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2173
interface))){
2174
if(strcmp(interface, "none") != 0
2175
and if_nametoindex(interface) == 0){
2176
if(interface[0] != '\0'){
2177
fprintf_plus(stderr, "Not using nonexisting interface"
2178
" \"%s\"\n", interface);
2179
}
2180
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2181
interface = NULL;
2182
}
2183
}
2184
}
2185
2186
/* Run network hooks */
2187
{
2188
if(mc.interfaces != NULL){
2189
interfaces_hooks = malloc(mc.interfaces_size);
2190
if(interfaces_hooks == NULL){
2191
perror_plus("malloc");
2192
goto end;
2193
}
2194
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2195
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2196
}
2197
run_network_hooks("start", interfaces_hooks != NULL ?
2198
interfaces_hooks : "", delay);
1654
int devnull = open("/dev/null", O_RDONLY);
1655
for(int i = 0; i < numhooks; i++){
1656
direntry = direntries[0];
1657
char *fullname = NULL;
1658
ret = asprintf(&fullname, "%s/%s", tempdir,
1659
direntry->d_name);
1660
if(ret < 0){
1661
perror_plus("asprintf");
1662
continue;
1663
}
1664
pid_t hook_pid = fork();
1665
if(hook_pid == 0){
1666
/* Child */
1667
dup2(devnull, STDIN_FILENO);
1668
close(devnull);
1669
dup2(STDERR_FILENO, STDOUT_FILENO);
1670
ret = setenv("DEVICE", interface, 1);
1671
if(ret == -1){
1672
perror_plus("setenv");
1673
exit(1);
1674
}
1675
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1676
if(ret == -1){
1677
perror_plus("setenv");
1678
exit(1);
1679
}
1680
ret = setenv("MODE", "start", 1);
1681
if(ret == -1){
1682
perror_plus("setenv");
1683
exit(1);
1684
}
1685
char *delaystring;
1686
ret = asprintf(&delaystring, "%f", delay);
1687
if(ret == -1){
1688
perror_plus("asprintf");
1689
exit(1);
1690
}
1691
ret = setenv("DELAY", delaystring, 1);
1692
if(ret == -1){
1693
free(delaystring);
1694
perror_plus("setenv");
1695
exit(1);
1696
}
1697
free(delaystring);
1698
ret = execl(fullname, direntry->d_name, "start", NULL);
1699
perror_plus("execl");
1700
} else {
1701
int status;
1702
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1703
perror_plus("waitpid");
1704
free(fullname);
1705
continue;
1706
}
1707
if(WIFEXITED(status)){
1708
if(WEXITSTATUS(status) != 0){
1709
fprintf(stderr, "Mandos plugin mandos-client: "
1710
"Warning: network hook \"%s\" exited"
1711
" with status %d\n", direntry->d_name,
1712
WEXITSTATUS(status));
1713
free(fullname);
1714
continue;
1715
}
1716
} else if(WIFSIGNALED(status)){
1717
fprintf(stderr, "Mandos plugin mandos-client: "
1718
"Warning: network hook \"%s\" died by"
1719
" signal %d\n", direntry->d_name,
1720
WTERMSIG(status));
1721
free(fullname);
1722
continue;
1723
} else {
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" crashed\n",
1726
direntry->d_name);
1727
free(fullname);
1728
continue;
1729
}
1730
}
1731
free(fullname);
1732
if(quit_now){
1733
goto end;
1734
}
1735
}
1736
close(devnull);
1737
}
2199
1738
}
2200
1739
2201
1740
if(not debug){
2202
1741
avahi_set_log_function(empty_log);
2203
1742
}
2204
1743
1744
if(interface[0] == '\0'){
1745
struct dirent **direntries;
1746
/* First look for interfaces that are up */
1747
ret = scandir(sys_class_net, &direntries, up_interface,
1748
alphasort);
1749
if(ret == 0){
1750
/* No up interfaces, look for any good interfaces */
1751
free(direntries);
1752
ret = scandir(sys_class_net, &direntries, good_interface,
1753
alphasort);
1754
}
1755
if(ret >= 1){
1756
/* Pick the first interface returned */
1757
interface = strdup(direntries[0]->d_name);
1758
if(debug){
1759
fprintf(stderr, "Mandos plugin mandos-client: "
1760
"Using interface \"%s\"\n", interface);
1761
}
1762
if(interface == NULL){
1763
perror_plus("malloc");
1764
free(direntries);
1765
exitcode = EXIT_FAILURE;
1766
goto end;
1767
}
1768
free(direntries);
1769
} else {
1770
free(direntries);
1771
fprintf(stderr, "Mandos plugin mandos-client: "
1772
"Could not find a network interface\n");
1773
exitcode = EXIT_FAILURE;
1774
goto end;
1775
}
1776
}
1777
2205
1778
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2206
1779
from the signal handler */
2207
1780
/* Initialize the pseudo-RNG for Avahi */
2208
1781
srand((unsigned int) time(NULL));
2209
simple_poll = avahi_simple_poll_new();
2210
if(simple_poll == NULL){
2211
fprintf_plus(stderr,
2212
"Avahi: Failed to create simple poll object.\n");
1782
mc.simple_poll = avahi_simple_poll_new();
1783
if(mc.simple_poll == NULL){
1784
fprintf(stderr, "Mandos plugin mandos-client: "
1785
"Avahi: Failed to create simple poll object.\n");
2213
1786
exitcode = EX_UNAVAILABLE;
2214
1787
goto end;
2215
1788
}
2277
1850
}
2278
1851
}
2279
1852
2280
/* If no interfaces were specified, make a list */
2281
if(mc.interfaces == NULL){
2282
struct dirent **direntries;
2283
/* Look for any good interfaces */
2284
ret = scandir(sys_class_net, &direntries, good_interface,
2285
alphasort);
2286
if(ret >= 1){
2287
/* Add all found interfaces to interfaces list */
2288
for(int i = 0; i < ret; ++i){
2289
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2290
direntries[i]->d_name);
2291
if(ret_errno != 0){
2292
errno = ret_errno;
2293
perror_plus("argz_add");
2294
continue;
2295
}
2296
if(debug){
2297
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2298
direntries[i]->d_name);
2299
}
2300
}
2301
free(direntries);
1853
/* If the interface is down, bring it up */
1854
if(strcmp(interface, "none") != 0){
1855
if_index = (AvahiIfIndex) if_nametoindex(interface);
1856
if(if_index == 0){
1857
fprintf(stderr, "Mandos plugin mandos-client: "
1858
"No such interface: \"%s\"\n", interface);
1859
exitcode = EX_UNAVAILABLE;
1860
goto end;
1861
}
1862
1863
if(quit_now){
1864
goto end;
1865
}
1866
1867
/* Re-raise priviliges */
1868
errno = 0;
1869
ret = seteuid(0);
1870
if(ret == -1){
1871
perror_plus("seteuid");
1872
}
1873
1874
#ifdef __linux__
1875
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1876
messages about the network interface to mess up the prompt */
1877
ret = klogctl(8, NULL, 5);
1878
bool restore_loglevel = true;
1879
if(ret == -1){
1880
restore_loglevel = false;
1881
perror_plus("klogctl");
1882
}
1883
#endif /* __linux__ */
1884
1885
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1886
if(sd < 0){
1887
perror_plus("socket");
1888
exitcode = EX_OSERR;
1889
#ifdef __linux__
1890
if(restore_loglevel){
1891
ret = klogctl(7, NULL, 0);
1892
if(ret == -1){
1893
perror_plus("klogctl");
1894
}
1895
}
1896
#endif /* __linux__ */
1897
/* Lower privileges */
1898
errno = 0;
1899
ret = seteuid(uid);
1900
if(ret == -1){
1901
perror_plus("seteuid");
1902
}
1903
goto end;
1904
}
1905
strcpy(network.ifr_name, interface);
1906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1907
if(ret == -1){
1908
perror_plus("ioctl SIOCGIFFLAGS");
1909
#ifdef __linux__
1910
if(restore_loglevel){
1911
ret = klogctl(7, NULL, 0);
1912
if(ret == -1){
1913
perror_plus("klogctl");
1914
}
1915
}
1916
#endif /* __linux__ */
1917
exitcode = EX_OSERR;
1918
/* Lower privileges */
1919
errno = 0;
1920
ret = seteuid(uid);
1921
if(ret == -1){
1922
perror_plus("seteuid");
1923
}
1924
goto end;
1925
}
1926
if((network.ifr_flags & IFF_UP) == 0){
1927
network.ifr_flags |= IFF_UP;
1928
take_down_interface = true;
1929
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1930
if(ret == -1){
1931
take_down_interface = false;
1932
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1933
exitcode = EX_OSERR;
1934
#ifdef __linux__
1935
if(restore_loglevel){
1936
ret = klogctl(7, NULL, 0);
1937
if(ret == -1){
1938
perror_plus("klogctl");
1939
}
1940
}
1941
#endif /* __linux__ */
1942
/* Lower privileges */
1943
errno = 0;
1944
ret = seteuid(uid);
1945
if(ret == -1){
1946
perror_plus("seteuid");
1947
}
1948
goto end;
1949
}
1950
}
1951
/* Sleep checking until interface is running.
1952
Check every 0.25s, up to total time of delay */
1953
for(int i=0; i < delay * 4; i++){
1954
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1955
if(ret == -1){
1956
perror_plus("ioctl SIOCGIFFLAGS");
1957
} else if(network.ifr_flags & IFF_RUNNING){
1958
break;
1959
}
1960
struct timespec sleeptime = { .tv_nsec = 250000000 };
1961
ret = nanosleep(&sleeptime, NULL);
1962
if(ret == -1 and errno != EINTR){
1963
perror_plus("nanosleep");
1964
}
1965
}
1966
if(not take_down_interface){
1967
/* We won't need the socket anymore */
1968
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1969
if(ret == -1){
1970
perror_plus("close");
1971
}
1972
}
1973
#ifdef __linux__
1974
if(restore_loglevel){
1975
/* Restores kernel loglevel to default */
1976
ret = klogctl(7, NULL, 0);
1977
if(ret == -1){
1978
perror_plus("klogctl");
1979
}
1980
}
1981
#endif /* __linux__ */
1982
/* Lower privileges */
1983
errno = 0;
1984
if(take_down_interface){
1985
/* Lower privileges */
1986
ret = seteuid(uid);
1987
if(ret == -1){
1988
perror_plus("seteuid");
1989
}
2302
1990
} else {
2303
free(direntries);
2304
fprintf_plus(stderr, "Could not find a network interface\n");
2305
exitcode = EXIT_FAILURE;
2306
goto end;
2307
}
2308
}
2309
2310
/* Bring up interfaces which are down, and remove any "none"s */
2311
{
2312
char *interface = NULL;
2313
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2314
interface))){
2315
/* If interface name is "none", stop bringing up interfaces.
2316
Also remove all instances of "none" from the list */
2317
if(strcmp(interface, "none") == 0){
2318
argz_delete(&mc.interfaces, &mc.interfaces_size,
2319
interface);
2320
interface = NULL;
2321
while((interface = argz_next(mc.interfaces,
2322
mc.interfaces_size, interface))){
2323
if(strcmp(interface, "none") == 0){
2324
argz_delete(&mc.interfaces, &mc.interfaces_size,
2325
interface);
2326
interface = NULL;
2327
}
2328
}
2329
break;
2330
}
2331
bool interface_was_up = interface_is_up(interface);
2332
errno = bring_up_interface(interface, delay);
2333
if(not interface_was_up){
2334
if(errno != 0){
2335
perror_plus("Failed to bring up interface");
2336
} else {
2337
errno = argz_add(&interfaces_to_take_down,
2338
&interfaces_to_take_down_size,
2339
interface);
2340
if(errno != 0){
2341
perror_plus("argz_add");
2342
}
2343
}
2344
}
2345
}
2346
if(debug and (interfaces_to_take_down == NULL)){
2347
fprintf_plus(stderr, "No interfaces were brought up\n");
2348
}
2349
}
2350
2351
/* If we only got one interface, explicitly use only that one */
2352
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2353
if(debug){
2354
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2355
mc.interfaces);
2356
}
2357
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1991
/* Lower privileges permanently */
1992
ret = setuid(uid);
1993
if(ret == -1){
1994
perror_plus("setuid");
1995
}
1996
}
2358
1997
}
2359
1998
2360
1999
if(quit_now){
2361
2000
goto end;
2362
2001
}
2363
2002
2364
ret = init_gnutls_global(pubkey, seckey, &mc);
2003
ret = init_gnutls_global(pubkey, seckey);
2365
2004
if(ret == -1){
2366
fprintf_plus(stderr, "init_gnutls_global failed\n");
2005
fprintf(stderr, "Mandos plugin mandos-client: "
2006
"init_gnutls_global failed\n");
2367
2007
exitcode = EX_UNAVAILABLE;
2368
2008
goto end;
2369
2009
} else {
2374
2014
goto end;
2375
2015
}
2376
2016
2377
/* Try /run/tmp before /tmp */
2378
tempdir = mkdtemp(run_tempdir);
2379
if(tempdir == NULL and errno == ENOENT){
2380
if(debug){
2381
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2382
run_tempdir, old_tempdir);
2383
}
2384
tempdir = mkdtemp(old_tempdir);
2385
}
2386
if(tempdir == NULL){
2017
if(mkdtemp(tempdir) == NULL){
2387
2018
perror_plus("mkdtemp");
2388
2019
goto end;
2389
2020
}
2021
tempdir_created = true;
2390
2022
2391
2023
if(quit_now){
2392
2024
goto end;
2393
2025
}
2394
2026
2395
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2396
fprintf_plus(stderr, "init_gpgme failed\n");
2027
if(not init_gpgme(pubkey, seckey, tempdir)){
2028
fprintf(stderr, "Mandos plugin mandos-client: "
2029
"init_gpgme failed\n");
2397
2030
exitcode = EX_UNAVAILABLE;
2398
2031
goto end;
2399
2032
} else {
2408
2041
/* Connect directly, do not use Zeroconf */
2409
2042
/* (Mainly meant for debugging) */
2410
2043
char *address = strrchr(connect_to, ':');
2411
2412
2044
if(address == NULL){
2413
fprintf_plus(stderr, "No colon in address\n");
2045
fprintf(stderr, "Mandos plugin mandos-client: "
2046
"No colon in address\n");
2414
2047
exitcode = EX_USAGE;
2415
2048
goto end;
2416
2049
}
2419
2052
goto end;
2420
2053
}
2421
2054
2422
in_port_t port;
2055
uint16_t port;
2423
2056
errno = 0;
2424
2057
tmpmax = strtoimax(address+1, &tmp, 10);
2425
2058
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2426
or tmpmax != (in_port_t)tmpmax){
2427
fprintf_plus(stderr, "Bad port number\n");
2059
or tmpmax != (uint16_t)tmpmax){
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"Bad port number\n");
2428
2062
exitcode = EX_USAGE;
2429
2063
goto end;
2430
2064
}
2431
2065
2432
2066
if(quit_now){
2433
2067
goto end;
2434
2068
}
2435
2069
2436
port = (in_port_t)tmpmax;
2070
port = (uint16_t)tmpmax;
2437
2071
*address = '\0';
2438
2072
/* Colon in address indicates IPv6 */
2439
2073
int af;
2455
2089
}
2456
2090
2457
2091
while(not quit_now){
2458
ret = start_mandos_communication(address, port, if_index, af,
2459
&mc);
2092
ret = start_mandos_communication(address, port, if_index, af);
2460
2093
if(quit_now or ret == 0){
2461
2094
break;
2462
2095
}
2463
2096
if(debug){
2464
fprintf_plus(stderr, "Retrying in %d seconds\n",
2465
(int)retry_interval);
2097
fprintf(stderr, "Mandos plugin mandos-client: "
2098
"Retrying in %d seconds\n", (int)retry_interval);
2466
2099
}
2467
sleep((unsigned int)retry_interval);
2100
sleep((int)retry_interval);
2468
2101
}
2469
2102
2470
if(not quit_now){
2103
if (not quit_now){
2471
2104
exitcode = EXIT_SUCCESS;
2472
2105
}
2473
2106
2488
2121
config.publish_domain = 0;
2489
2122
2490
2123
/* Allocate a new server */
2491
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2492
&config, NULL, NULL, &ret_errno);
2124
mc.server = avahi_server_new(avahi_simple_poll_get
2125
(mc.simple_poll), &config, NULL,
2126
NULL, &error);
2493
2127
2494
2128
/* Free the Avahi configuration data */
2495
2129
avahi_server_config_free(&config);
2497
2131
2498
2132
/* Check if creating the Avahi server object succeeded */
2499
2133
if(mc.server == NULL){
2500
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2501
avahi_strerror(ret_errno));
2134
fprintf(stderr, "Mandos plugin mandos-client: "
2135
"Failed to create Avahi server: %s\n",
2136
avahi_strerror(error));
2502
2137
exitcode = EX_UNAVAILABLE;
2503
2138
goto end;
2504
2139
}
2510
2145
/* Create the Avahi service browser */
2511
2146
sb = avahi_s_service_browser_new(mc.server, if_index,
2512
2147
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2513
NULL, 0, browse_callback,
2514
(void *)&mc);
2148
NULL, 0, browse_callback, NULL);
2515
2149
if(sb == NULL){
2516
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2517
avahi_strerror(avahi_server_errno(mc.server)));
2150
fprintf(stderr, "Mandos plugin mandos-client: "
2151
"Failed to create service browser: %s\n",
2152
avahi_strerror(avahi_server_errno(mc.server)));
2518
2153
exitcode = EX_UNAVAILABLE;
2519
2154
goto end;
2520
2155
}
2526
2161
/* Run the main loop */
2527
2162
2528
2163
if(debug){
2529
fprintf_plus(stderr, "Starting Avahi loop search\n");
2164
fprintf(stderr, "Mandos plugin mandos-client: "
2165
"Starting Avahi loop search\n");
2530
2166
}
2531
2532
ret = avahi_loop_with_timeout(simple_poll,
2533
(int)(retry_interval * 1000), &mc);
2167
2168
ret = avahi_loop_with_timeout(mc.simple_poll,
2169
(int)(retry_interval * 1000));
2534
2170
if(debug){
2535
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2536
(ret == 0) ? "successfully" : "with error");
2171
fprintf(stderr, "Mandos plugin mandos-client: "
2172
"avahi_loop_with_timeout exited %s\n",
2173
(ret == 0) ? "successfully" : "with error");
2537
2174
}
2538
2175
2539
2176
end:
2540
2177
2541
2178
if(debug){
2542
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"%s exiting\n", argv[0]);
2543
2181
}
2544
2182
2545
2183
/* Cleanup things */
2546
free(mc.interfaces);
2547
2548
2184
if(sb != NULL)
2549
2185
avahi_s_service_browser_free(sb);
2550
2186
2551
2187
if(mc.server != NULL)
2552
2188
avahi_server_free(mc.server);
2553
2189
2554
if(simple_poll != NULL)
2555
avahi_simple_poll_free(simple_poll);
2190
if(mc.simple_poll != NULL)
2191
avahi_simple_poll_free(mc.simple_poll);
2556
2192
2557
2193
if(gnutls_initialized){
2558
2194
gnutls_certificate_free_credentials(mc.cred);
2563
2199
if(gpgme_initialized){
2564
2200
gpgme_release(mc.ctx);
2565
2201
}
2566
2202
2567
2203
/* Cleans up the circular linked list of Mandos servers the client
2568
2204
has seen */
2569
2205
if(mc.current_server != NULL){
2575
2211
}
2576
2212
}
2577
2213
2578
/* Re-raise privileges */
2579
{
2580
ret_errno = raise_privileges();
2581
if(ret_errno != 0){
2582
perror_plus("Failed to raise privileges");
2583
} else {
2584
2585
/* Run network hooks */
2586
run_network_hooks("stop", interfaces_hooks != NULL ?
2587
interfaces_hooks : "", delay);
2588
2589
/* Take down the network interfaces which were brought up */
2590
{
2591
char *interface = NULL;
2592
while((interface=argz_next(interfaces_to_take_down,
2593
interfaces_to_take_down_size,
2594
interface))){
2595
ret_errno = take_down_interface(interface);
2596
if(ret_errno != 0){
2597
errno = ret_errno;
2598
perror_plus("Failed to take down interface");
2599
}
2600
}
2601
if(debug and (interfaces_to_take_down == NULL)){
2602
fprintf_plus(stderr, "No interfaces needed to be taken"
2603
" down\n");
2604
}
2605
}
2214
/* XXX run network hooks "stop" here */
2215
2216
/* Take down the network interface */
2217
if(take_down_interface){
2218
/* Re-raise priviliges */
2219
errno = 0;
2220
ret = seteuid(0);
2221
if(ret == -1){
2222
perror_plus("seteuid");
2606
2223
}
2607
2608
ret_errno = lower_privileges_permanently();
2609
if(ret_errno != 0){
2610
perror_plus("Failed to lower privileges permanently");
2224
if(geteuid() == 0){
2225
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2226
if(ret == -1){
2227
perror_plus("ioctl SIOCGIFFLAGS");
2228
} else if(network.ifr_flags & IFF_UP){
2229
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2230
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2231
if(ret == -1){
2232
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2233
}
2234
}
2235
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2236
if(ret == -1){
2237
perror_plus("close");
2238
}
2239
/* Lower privileges permanently */
2240
errno = 0;
2241
ret = setuid(uid);
2242
if(ret == -1){
2243
perror_plus("setuid");
2244
}
2611
2245
}
2612
2246
}
2613
2247
2614
free(interfaces_to_take_down);
2615
free(interfaces_hooks);
2616
2617
2248
/* Removes the GPGME temp directory and all files inside */
2618
if(tempdir != NULL){
2249
if(tempdir_created){
2619
2250
struct dirent **direntries = NULL;
2620
2251
struct dirent *direntry = NULL;
2621
2252
int numentries = scandir(tempdir, &direntries, notdotentries,
2622
2253
alphasort);
2623
if(numentries > 0){
2254
if (numentries > 0){
2624
2255
for(int i = 0; i < numentries; i++){
2625
2256
direntry = direntries[i];
2626
2257
char *fullname = NULL;
2632
2263
}
2633
2264
ret = remove(fullname);
2634
2265
if(ret == -1){
2635
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2636
strerror(errno));
2266
fprintf(stderr, "Mandos plugin mandos-client: "
2267
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2637
2268
}
2638
2269
free(fullname);
2639
2270
}
2640
2271
}
2641
2272
2642
2273
/* need to clean even if 0 because man page doesn't specify */
2643
2274
free(direntries);
2644
if(numentries == -1){
2275
if (numentries == -1){
2645
2276
perror_plus("scandir");
2646
2277
}
2647
2278
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0