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- Committer: Teddy Hogeborn
- Date: 2014-06-07 22:37:22 UTC
- Revision ID: teddy@recompile.se-20140607223722-55qmdr3n9x39pvx4
Make mandos-client use fstatat().
* plugins.d/mandos-client.d (runnable_hook): Use fstatat().
* plugins.d/mandos-client.d (runnable_hook): Use fstatat().
- 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
*
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* 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
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#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
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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
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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(),
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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() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
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#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
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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
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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() */
90
97
91
98
#ifdef __linux__
92
99
#include <sys/klog.h> /* klogctl() */
134
141
static const char sys_class_net[] = "/sys/class/net";
135
142
char *connect_to = NULL;
136
143
const char *hookdir = HOOKDIR;
144
int hookdir_fd = -1;
145
uid_t uid = 65534;
146
gid_t gid = 65534;
137
147
138
148
/* Doubly linked list that need to be circularly linked when used */
139
149
typedef struct server{
140
150
const char *ip;
141
uint16_t port;
151
in_port_t port;
142
152
AvahiIfIndex if_index;
143
153
int af;
144
154
struct timespec last_seen;
148
158
149
159
/* Used for passing in values through the Avahi callback functions */
150
160
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
161
AvahiServer *server;
153
162
gnutls_certificate_credentials_t cred;
154
163
unsigned int dh_bits;
156
165
const char *priority;
157
166
gpgme_ctx_t ctx;
158
167
server *current_server;
168
char *interfaces;
169
size_t interfaces_size;
159
170
} mandos_context;
160
171
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
172
/* global so signal handler can reach it*/
173
AvahiSimplePoll *simple_poll;
166
174
167
175
sig_atomic_t quit_now = 0;
168
176
int signal_received = 0;
169
177
170
178
/* Function to use when printing errors */
171
179
void perror_plus(const char *print_text){
180
int e = errno;
172
181
fprintf(stderr, "Mandos plugin %s: ",
173
182
program_invocation_short_name);
183
errno = e;
174
184
perror(print_text);
175
185
}
176
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
177
197
/*
178
198
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
199
* bytes. "buffer_capacity" is how much is currently allocated,
180
200
* "buffer_length" is how much is already used.
181
201
*/
202
__attribute__((nonnull, warn_unused_result))
182
203
size_t incbuffer(char **buffer, size_t buffer_length,
183
204
size_t buffer_capacity){
184
205
if(buffer_length + BUFFER_SIZE > buffer_capacity){
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
186
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;
187
212
return 0;
188
213
}
214
*buffer = new_buf;
189
215
buffer_capacity += BUFFER_SIZE;
190
216
}
191
217
return buffer_capacity;
192
218
}
193
219
194
220
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
196
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){
197
224
int ret;
198
225
server *new_server = malloc(sizeof(server));
199
226
if(new_server == NULL){
200
227
perror_plus("malloc");
201
return -1;
228
return false;
202
229
}
203
230
*new_server = (server){ .ip = strdup(ip),
204
231
.port = port,
206
233
.af = af };
207
234
if(new_server->ip == NULL){
208
235
perror_plus("strdup");
209
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;
210
242
}
211
243
/* Special case of first server */
212
if (mc.current_server == NULL){
244
if(*current_server == NULL){
213
245
new_server->next = new_server;
214
246
new_server->prev = new_server;
215
mc.current_server = new_server;
216
/* Place the new server last in the list */
247
*current_server = new_server;
217
248
} else {
218
new_server->next = mc.current_server;
219
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;
220
252
new_server->prev->next = new_server;
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;
253
(*current_server)->prev = new_server;
254
}
255
return true;
229
256
}
230
257
231
258
/*
232
259
* Initialize GPGME.
233
260
*/
234
static bool init_gpgme(const char *seckey, const char *pubkey,
235
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){
236
266
gpgme_error_t rc;
237
267
gpgme_engine_info_t engine_info;
238
268
239
240
269
/*
241
270
* Helper function to insert pub and seckey to the engine keyring.
242
271
*/
243
bool import_key(const char *filename){
272
bool import_key(const char * const filename){
244
273
int ret;
245
274
int fd;
246
275
gpgme_data_t pgp_data;
253
282
254
283
rc = gpgme_data_new_from_fd(&pgp_data, fd);
255
284
if(rc != GPG_ERR_NO_ERROR){
256
fprintf(stderr, "Mandos plugin mandos-client: "
257
"bad gpgme_data_new_from_fd: %s: %s\n",
258
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));
259
287
return false;
260
288
}
261
289
262
rc = gpgme_op_import(mc.ctx, pgp_data);
290
rc = gpgme_op_import(mc->ctx, pgp_data);
263
291
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "Mandos plugin mandos-client: "
265
"bad gpgme_op_import: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
292
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
293
gpgme_strsource(rc), gpgme_strerror(rc));
267
294
return false;
268
295
}
269
296
276
303
}
277
304
278
305
if(debug){
279
fprintf(stderr, "Mandos plugin mandos-client: "
280
"Initializing GPGME\n");
306
fprintf_plus(stderr, "Initializing GPGME\n");
281
307
}
282
308
283
309
/* Init GPGME */
284
310
gpgme_check_version(NULL);
285
311
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
286
312
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "Mandos plugin mandos-client: "
288
"bad gpgme_engine_check_version: %s: %s\n",
289
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));
290
315
return false;
291
316
}
292
317
293
318
/* Set GPGME home directory for the OpenPGP engine only */
294
319
rc = gpgme_get_engine_info(&engine_info);
295
320
if(rc != GPG_ERR_NO_ERROR){
296
fprintf(stderr, "Mandos plugin mandos-client: "
297
"bad gpgme_get_engine_info: %s: %s\n",
298
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));
299
323
return false;
300
324
}
301
325
while(engine_info != NULL){
307
331
engine_info = engine_info->next;
308
332
}
309
333
if(engine_info == NULL){
310
fprintf(stderr, "Mandos plugin mandos-client: "
311
"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);
312
336
return false;
313
337
}
314
338
315
339
/* Create new GPGME "context" */
316
rc = gpgme_new(&(mc.ctx));
340
rc = gpgme_new(&(mc->ctx));
317
341
if(rc != GPG_ERR_NO_ERROR){
318
fprintf(stderr, "Mandos plugin mandos-client: "
319
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
320
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));
321
345
return false;
322
346
}
323
347
332
356
* Decrypt OpenPGP data.
333
357
* Returns -1 on error
334
358
*/
359
__attribute__((nonnull, warn_unused_result))
335
360
static ssize_t pgp_packet_decrypt(const char *cryptotext,
336
361
size_t crypto_size,
337
char **plaintext){
362
char **plaintext,
363
mandos_context *mc){
338
364
gpgme_data_t dh_crypto, dh_plain;
339
365
gpgme_error_t rc;
340
366
ssize_t ret;
342
368
ssize_t plaintext_length = 0;
343
369
344
370
if(debug){
345
fprintf(stderr, "Mandos plugin mandos-client: "
346
"Trying to decrypt OpenPGP data\n");
371
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
347
372
}
348
373
349
374
/* Create new GPGME data buffer from memory cryptotext */
350
375
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
351
376
0);
352
377
if(rc != GPG_ERR_NO_ERROR){
353
fprintf(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_data_new_from_mem: %s: %s\n",
355
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));
356
380
return -1;
357
381
}
358
382
359
383
/* Create new empty GPGME data buffer for the plaintext */
360
384
rc = gpgme_data_new(&dh_plain);
361
385
if(rc != GPG_ERR_NO_ERROR){
362
fprintf(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
364
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));
365
389
gpgme_data_release(dh_crypto);
366
390
return -1;
367
391
}
368
392
369
393
/* Decrypt data from the cryptotext data buffer to the plaintext
370
394
data buffer */
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
395
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
372
396
if(rc != GPG_ERR_NO_ERROR){
373
fprintf(stderr, "Mandos plugin mandos-client: "
374
"bad gpgme_op_decrypt: %s: %s\n",
375
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
398
gpgme_strsource(rc), gpgme_strerror(rc));
376
399
plaintext_length = -1;
377
400
if(debug){
378
401
gpgme_decrypt_result_t result;
379
result = gpgme_op_decrypt_result(mc.ctx);
402
result = gpgme_op_decrypt_result(mc->ctx);
380
403
if(result == NULL){
381
fprintf(stderr, "Mandos plugin mandos-client: "
382
"gpgme_op_decrypt_result failed\n");
404
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
383
405
} else {
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);
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);
390
410
if(result->file_name != NULL){
391
fprintf(stderr, "Mandos plugin mandos-client: "
392
"File name: %s\n", result->file_name);
411
fprintf_plus(stderr, "File name: %s\n", result->file_name);
393
412
}
394
413
gpgme_recipient_t recipient;
395
414
recipient = result->recipients;
396
415
while(recipient != NULL){
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");
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");
406
423
recipient = recipient->next;
407
424
}
408
425
}
411
428
}
412
429
413
430
if(debug){
414
fprintf(stderr, "Mandos plugin mandos-client: "
415
"Decryption of OpenPGP data succeeded\n");
431
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
416
432
}
417
433
418
434
/* Seek back to the beginning of the GPGME plaintext data buffer */
449
465
}
450
466
451
467
if(debug){
452
fprintf(stderr, "Mandos plugin mandos-client: "
453
"Decrypted password is: ");
468
fprintf_plus(stderr, "Decrypted password is: ");
454
469
for(ssize_t i = 0; i < plaintext_length; i++){
455
470
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
471
}
467
482
return plaintext_length;
468
483
}
469
484
470
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value); /* Spurious warning from
472
-Wunreachable-code */
485
__attribute__((warn_unused_result))
486
static const char *safer_gnutls_strerror(int value){
487
const char *ret = gnutls_strerror(value);
473
488
if(ret == NULL)
474
489
ret = "(unknown)";
475
490
return ret;
476
491
}
477
492
478
493
/* GnuTLS log function callback */
494
__attribute__((nonnull))
479
495
static void debuggnutls(__attribute__((unused)) int level,
480
496
const char* string){
481
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
497
fprintf_plus(stderr, "GnuTLS: %s", string);
482
498
}
483
499
500
__attribute__((nonnull, warn_unused_result))
484
501
static int init_gnutls_global(const char *pubkeyfilename,
485
const char *seckeyfilename){
502
const char *seckeyfilename,
503
mandos_context *mc){
486
504
int ret;
487
505
488
506
if(debug){
489
fprintf(stderr, "Mandos plugin mandos-client: "
490
"Initializing GnuTLS\n");
507
fprintf_plus(stderr, "Initializing GnuTLS\n");
491
508
}
492
509
493
510
ret = gnutls_global_init();
494
511
if(ret != GNUTLS_E_SUCCESS){
495
fprintf(stderr, "Mandos plugin mandos-client: "
496
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
512
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
513
safer_gnutls_strerror(ret));
497
514
return -1;
498
515
}
499
516
506
523
}
507
524
508
525
/* OpenPGP credentials */
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
526
ret = gnutls_certificate_allocate_credentials(&mc->cred);
510
527
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "Mandos plugin mandos-client: "
512
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
529
safer_gnutls_strerror(ret));
513
530
gnutls_global_deinit();
514
531
return -1;
515
532
}
516
533
517
534
if(debug){
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);
535
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
536
" secret key %s as GnuTLS credentials\n",
537
pubkeyfilename,
538
seckeyfilename);
522
539
}
523
540
524
541
ret = gnutls_certificate_set_openpgp_key_file
525
(mc.cred, pubkeyfilename, seckeyfilename,
542
(mc->cred, pubkeyfilename, seckeyfilename,
526
543
GNUTLS_OPENPGP_FMT_BASE64);
527
544
if(ret != GNUTLS_E_SUCCESS){
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));
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));
534
550
goto globalfail;
535
551
}
536
552
537
553
/* GnuTLS server initialization */
538
ret = gnutls_dh_params_init(&mc.dh_params);
554
ret = gnutls_dh_params_init(&mc->dh_params);
539
555
if(ret != GNUTLS_E_SUCCESS){
540
fprintf(stderr, "Mandos plugin mandos-client: "
541
"Error in GnuTLS DH parameter initialization:"
542
" %s\n", safer_gnutls_strerror(ret));
556
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
557
" initialization: %s\n",
558
safer_gnutls_strerror(ret));
543
559
goto globalfail;
544
560
}
545
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
561
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
546
562
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Mandos plugin mandos-client: "
548
"Error in GnuTLS prime generation: %s\n",
549
safer_gnutls_strerror(ret));
563
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
564
safer_gnutls_strerror(ret));
550
565
goto globalfail;
551
566
}
552
567
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
568
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
554
569
555
570
return 0;
556
571
557
572
globalfail:
558
573
559
gnutls_certificate_free_credentials(mc.cred);
574
gnutls_certificate_free_credentials(mc->cred);
560
575
gnutls_global_deinit();
561
gnutls_dh_params_deinit(mc.dh_params);
576
gnutls_dh_params_deinit(mc->dh_params);
562
577
return -1;
563
578
}
564
579
565
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){
566
583
int ret;
567
584
/* GnuTLS session creation */
568
585
do {
572
589
}
573
590
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
574
591
if(ret != GNUTLS_E_SUCCESS){
575
fprintf(stderr, "Mandos plugin mandos-client: "
576
"Error in GnuTLS session initialization: %s\n",
577
safer_gnutls_strerror(ret));
592
fprintf_plus(stderr,
593
"Error in GnuTLS session initialization: %s\n",
594
safer_gnutls_strerror(ret));
578
595
}
579
596
580
597
{
581
598
const char *err;
582
599
do {
583
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
600
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
584
601
if(quit_now){
585
602
gnutls_deinit(*session);
586
603
return -1;
587
604
}
588
605
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
589
606
if(ret != GNUTLS_E_SUCCESS){
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));
607
fprintf_plus(stderr, "Syntax error at: %s\n", err);
608
fprintf_plus(stderr, "GnuTLS error: %s\n",
609
safer_gnutls_strerror(ret));
594
610
gnutls_deinit(*session);
595
611
return -1;
596
612
}
598
614
599
615
do {
600
616
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
601
mc.cred);
617
mc->cred);
602
618
if(quit_now){
603
619
gnutls_deinit(*session);
604
620
return -1;
605
621
}
606
622
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
623
if(ret != GNUTLS_E_SUCCESS){
608
fprintf(stderr, "Mandos plugin mandos-client: "
609
"Error setting GnuTLS credentials: %s\n",
610
safer_gnutls_strerror(ret));
624
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
625
safer_gnutls_strerror(ret));
611
626
gnutls_deinit(*session);
612
627
return -1;
613
628
}
615
630
/* ignore client certificate if any. */
616
631
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
617
632
618
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
633
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
619
634
620
635
return 0;
621
636
}
625
640
__attribute__((unused)) const char *txt){}
626
641
627
642
/* Called when a Mandos server is found */
628
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,
629
645
AvahiIfIndex if_index,
630
int af){
646
int af, mandos_context *mc){
631
647
int ret, tcp_sd = -1;
632
648
ssize_t sret;
633
union {
634
struct sockaddr_in in;
635
struct sockaddr_in6 in6;
636
} to;
649
struct sockaddr_storage to;
637
650
char *buffer = NULL;
638
651
char *decrypted_buffer = NULL;
639
652
size_t buffer_length = 0;
658
671
pf = PF_INET;
659
672
break;
660
673
default:
661
fprintf(stderr, "Mandos plugin mandos-client: "
662
"Bad address family: %d\n", af);
674
fprintf_plus(stderr, "Bad address family: %d\n", af);
663
675
errno = EINVAL;
664
676
return -1;
665
677
}
666
678
667
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);
668
712
if(ret != 0){
669
713
return -1;
670
714
}
671
715
672
716
if(debug){
673
fprintf(stderr, "Mandos plugin mandos-client: "
674
"Setting up a TCP connection to %s, port %" PRIu16
675
"\n", ip, port);
717
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
718
PRIuMAX "\n", ip, (uintmax_t)port);
676
719
}
677
720
678
721
tcp_sd = socket(pf, SOCK_STREAM, 0);
690
733
691
734
memset(&to, 0, sizeof(to));
692
735
if(af == AF_INET6){
693
to.in6.sin6_family = (sa_family_t)af;
694
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);
695
738
} else { /* IPv4 */
696
to.in.sin_family = (sa_family_t)af;
697
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);
698
741
}
699
742
if(ret < 0 ){
700
743
int e = errno;
704
747
}
705
748
if(ret == 0){
706
749
int e = errno;
707
fprintf(stderr, "Mandos plugin mandos-client: "
708
"Bad address: %s\n", ip);
750
fprintf_plus(stderr, "Bad address: %s\n", ip);
709
751
errno = e;
710
752
goto mandos_end;
711
753
}
712
754
if(af == AF_INET6){
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*/
755
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
756
if(IN6_IS_ADDR_LINKLOCAL
757
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
720
758
if(if_index == AVAHI_IF_UNSPEC){
721
fprintf(stderr, "Mandos plugin mandos-client: "
722
"An IPv6 link-local address is incomplete"
723
" without a network interface\n");
759
fprintf_plus(stderr, "An IPv6 link-local address is"
760
" incomplete without a network interface\n");
724
761
errno = EINVAL;
725
762
goto mandos_end;
726
763
}
727
764
/* Set the network interface number as scope */
728
to.in6.sin6_scope_id = (uint32_t)if_index;
765
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
729
766
}
730
767
} else {
731
to.in.sin_port = htons(port); /* Spurious warnings from
732
-Wconversion and
733
-Wunreachable-code */
768
((struct sockaddr_in *)&to)->sin_port = htons(port);
734
769
}
735
770
736
771
if(quit_now){
744
779
if(if_indextoname((unsigned int)if_index, interface) == NULL){
745
780
perror_plus("if_indextoname");
746
781
} else {
747
fprintf(stderr, "Mandos plugin mandos-client: "
748
"Connection to: %s%%%s, port %" PRIu16 "\n",
749
ip, interface, port);
782
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
783
"\n", ip, interface, (uintmax_t)port);
750
784
}
751
785
} else {
752
fprintf(stderr, "Mandos plugin mandos-client: "
753
"Connection to: %s, port %" PRIu16 "\n", ip, port);
786
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
787
ip, (uintmax_t)port);
754
788
}
755
789
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
756
790
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
757
const char *pcret;
758
791
if(af == AF_INET6){
759
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
760
sizeof(addrstr));
792
ret = getnameinfo((struct sockaddr *)&to,
793
sizeof(struct sockaddr_in6),
794
addrstr, sizeof(addrstr), NULL, 0,
795
NI_NUMERICHOST);
761
796
} else {
762
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
763
sizeof(addrstr));
797
ret = getnameinfo((struct sockaddr *)&to,
798
sizeof(struct sockaddr_in),
799
addrstr, sizeof(addrstr), NULL, 0,
800
NI_NUMERICHOST);
764
801
}
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
}
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);
772
808
}
773
809
}
774
810
778
814
}
779
815
780
816
if(af == AF_INET6){
781
ret = connect(tcp_sd, &to.in6, sizeof(to));
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
782
819
} else {
783
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
784
822
}
785
823
if(ret < 0){
786
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
787
825
int e = errno;
788
826
perror_plus("connect");
789
827
errno = e;
827
865
}
828
866
829
867
if(debug){
830
fprintf(stderr, "Mandos plugin mandos-client: "
831
"Establishing TLS session with %s\n", ip);
868
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
832
869
}
833
870
834
871
if(quit_now){
836
873
goto mandos_end;
837
874
}
838
875
839
/* Spurious warning from -Wint-to-pointer-cast */
840
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);
841
881
842
882
if(quit_now){
843
883
errno = EINTR;
854
894
855
895
if(ret != GNUTLS_E_SUCCESS){
856
896
if(debug){
857
fprintf(stderr, "Mandos plugin mandos-client: "
858
"*** GnuTLS Handshake failed ***\n");
897
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
859
898
gnutls_perror(ret);
860
899
}
861
900
errno = EPROTO;
865
904
/* Read OpenPGP packet that contains the wanted password */
866
905
867
906
if(debug){
868
fprintf(stderr, "Mandos plugin mandos-client: "
869
"Retrieving OpenPGP encrypted password from %s\n", ip);
907
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
908
" %s\n", ip);
870
909
}
871
910
872
911
while(true){
910
949
}
911
950
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
912
951
if(ret < 0){
913
fprintf(stderr, "Mandos plugin mandos-client: "
914
"*** GnuTLS Re-handshake failed ***\n");
952
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
953
"***\n");
915
954
gnutls_perror(ret);
916
955
errno = EPROTO;
917
956
goto mandos_end;
918
957
}
919
958
break;
920
959
default:
921
fprintf(stderr, "Mandos plugin mandos-client: "
922
"Unknown error while reading data from"
923
" encrypted session with Mandos server\n");
960
fprintf_plus(stderr, "Unknown error while reading data from"
961
" encrypted session with Mandos server\n");
924
962
gnutls_bye(session, GNUTLS_SHUT_RDWR);
925
963
errno = EIO;
926
964
goto mandos_end;
931
969
}
932
970
933
971
if(debug){
934
fprintf(stderr, "Mandos plugin mandos-client: "
935
"Closing TLS session\n");
972
fprintf_plus(stderr, "Closing TLS session\n");
936
973
}
937
974
938
975
if(quit_now){
951
988
if(buffer_length > 0){
952
989
ssize_t decrypted_buffer_size;
953
990
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
954
&decrypted_buffer);
991
&decrypted_buffer, mc);
955
992
if(decrypted_buffer_size >= 0){
956
993
957
994
written = 0;
967
1004
if(ret == 0 and ferror(stdout)){
968
1005
int e = errno;
969
1006
if(debug){
970
fprintf(stderr, "Mandos plugin mandos-client: "
971
"Error writing encrypted data: %s\n",
972
strerror(errno));
1007
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1008
strerror(errno));
973
1009
}
974
1010
errno = e;
975
1011
goto mandos_end;
1006
1042
return retval;
1007
1043
}
1008
1044
1045
__attribute__((nonnull))
1009
1046
static void resolve_callback(AvahiSServiceResolver *r,
1010
1047
AvahiIfIndex interface,
1011
1048
AvahiProtocol proto,
1019
1056
AVAHI_GCC_UNUSED AvahiStringList *txt,
1020
1057
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1021
1058
flags,
1022
AVAHI_GCC_UNUSED void* userdata){
1023
assert(r);
1059
void *mc){
1060
if(r == NULL){
1061
return;
1062
}
1024
1063
1025
1064
/* Called whenever a service has been resolved successfully or
1026
1065
timed out */
1032
1071
switch(event){
1033
1072
default:
1034
1073
case AVAHI_RESOLVER_FAILURE:
1035
fprintf(stderr, "Mandos plugin mandos-client: "
1036
"(Avahi Resolver) Failed to resolve service '%s'"
1037
" of type '%s' in domain '%s': %s\n", name, type, domain,
1038
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)));
1039
1079
break;
1040
1080
1041
1081
case AVAHI_RESOLVER_FOUND:
1043
1083
char ip[AVAHI_ADDRESS_STR_MAX];
1044
1084
avahi_address_snprint(ip, sizeof(ip), address);
1045
1085
if(debug){
1046
fprintf(stderr, "Mandos plugin mandos-client: "
1047
"Mandos server \"%s\" found on %s (%s, %"
1048
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1049
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);
1050
1089
}
1051
int ret = start_mandos_communication(ip, port, interface,
1052
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);
1053
1094
if(ret == 0){
1054
avahi_simple_poll_quit(mc.simple_poll);
1095
avahi_simple_poll_quit(simple_poll);
1055
1096
} else {
1056
ret = add_server(ip, port, interface,
1057
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
}
1058
1103
}
1059
1104
}
1060
1105
}
1070
1115
const char *domain,
1071
1116
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1072
1117
flags,
1073
AVAHI_GCC_UNUSED void* userdata){
1074
assert(b);
1118
void *mc){
1119
if(b == NULL){
1120
return;
1121
}
1075
1122
1076
1123
/* Called whenever a new services becomes available on the LAN or
1077
1124
is removed from the LAN */
1084
1131
default:
1085
1132
case AVAHI_BROWSER_FAILURE:
1086
1133
1087
fprintf(stderr, "Mandos plugin mandos-client: "
1088
"(Avahi browser) %s\n",
1089
avahi_strerror(avahi_server_errno(mc.server)));
1090
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);
1091
1138
return;
1092
1139
1093
1140
case AVAHI_BROWSER_NEW:
1096
1143
the callback function is called the Avahi server will free the
1097
1144
resolver for us. */
1098
1145
1099
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1100
name, type, domain, protocol, 0,
1101
resolve_callback, NULL) == NULL)
1102
fprintf(stderr, "Mandos plugin mandos-client: "
1103
"Avahi: Failed to resolve service '%s': %s\n",
1104
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)));
1105
1154
break;
1106
1155
1107
1156
case AVAHI_BROWSER_REMOVE:
1110
1159
case AVAHI_BROWSER_ALL_FOR_NOW:
1111
1160
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1112
1161
if(debug){
1113
fprintf(stderr, "Mandos plugin mandos-client: "
1114
"No Mandos server found, still searching...\n");
1162
fprintf_plus(stderr, "No Mandos server found, still"
1163
" searching...\n");
1115
1164
}
1116
1165
break;
1117
1166
}
1126
1175
signal_received = sig;
1127
1176
int old_errno = errno;
1128
1177
/* set main loop to exit */
1129
if(mc.simple_poll != NULL){
1130
avahi_simple_poll_quit(mc.simple_poll);
1178
if(simple_poll != NULL){
1179
avahi_simple_poll_quit(simple_poll);
1131
1180
}
1132
1181
errno = old_errno;
1133
1182
}
1134
1183
1184
__attribute__((nonnull, warn_unused_result))
1135
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1136
1186
int ret;
1187
error_t ret_errno;
1137
1188
1138
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1139
1190
if(s < 0){
1191
ret_errno = errno;
1140
1192
perror_plus("socket");
1193
errno = ret_errno;
1141
1194
return false;
1142
1195
}
1143
1196
strcpy(ifr->ifr_name, ifname);
1144
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1145
1198
if(ret == -1){
1146
1199
if(debug){
1200
ret_errno = errno;
1147
1201
perror_plus("ioctl SIOCGIFFLAGS");
1202
errno = ret_errno;
1148
1203
}
1149
1204
return false;
1150
1205
}
1151
1206
return true;
1152
1207
}
1153
1208
1209
__attribute__((nonnull, warn_unused_result))
1154
1210
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1211
1156
1212
/* Reject the loopback device */
1157
1213
if(ifr->ifr_flags & IFF_LOOPBACK){
1158
1214
if(debug){
1159
fprintf(stderr, "Mandos plugin mandos-client: "
1160
"Rejecting loopback interface \"%s\"\n", ifname);
1215
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1216
ifname);
1161
1217
}
1162
1218
return false;
1163
1219
}
1164
1220
/* Accept point-to-point devices only if connect_to is specified */
1165
1221
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1166
1222
if(debug){
1167
fprintf(stderr, "Mandos plugin mandos-client: "
1168
"Accepting point-to-point interface \"%s\"\n", ifname);
1223
fprintf_plus(stderr, "Accepting point-to-point interface"
1224
" \"%s\"\n", ifname);
1169
1225
}
1170
1226
return true;
1171
1227
}
1172
1228
/* Otherwise, reject non-broadcast-capable devices */
1173
1229
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1174
1230
if(debug){
1175
fprintf(stderr, "Mandos plugin mandos-client: "
1176
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1231
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1232
" \"%s\"\n", ifname);
1177
1233
}
1178
1234
return false;
1179
1235
}
1180
1236
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
1237
if(ifr->ifr_flags & IFF_NOARP){
1182
1238
if(debug){
1183
fprintf(stderr, "Mandos plugin mandos-client: "
1184
"Rejecting non-ARP interface \"%s\"\n", ifname);
1239
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1240
ifname);
1185
1241
}
1186
1242
return false;
1187
1243
}
1188
1244
1189
1245
/* Accept this device */
1190
1246
if(debug){
1191
fprintf(stderr, "Mandos plugin mandos-client: "
1192
"Interface \"%s\" is good\n", ifname);
1247
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1193
1248
}
1194
1249
return true;
1195
1250
}
1199
1254
* corresponds to an acceptable network device.
1200
1255
* (This function is passed to scandir(3) as a filter function.)
1201
1256
*/
1257
__attribute__((nonnull, warn_unused_result))
1202
1258
int good_interface(const struct dirent *if_entry){
1203
1259
if(if_entry->d_name[0] == '.'){
1204
1260
return 0;
1207
1263
struct ifreq ifr;
1208
1264
if(not get_flags(if_entry->d_name, &ifr)){
1209
1265
if(debug){
1210
fprintf(stderr, "Mandos plugin mandos-client: "
1211
"Failed to get flags for interface \"%s\"\n",
1212
if_entry->d_name);
1213
}
1214
return 0;
1215
}
1216
1217
if(not good_flags(if_entry->d_name, &ifr)){
1218
return 0;
1219
}
1220
return 1;
1221
}
1222
1223
/*
1224
* This function determines if a directory entry in /sys/class/net
1225
* corresponds to an acceptable network device which is up.
1226
* (This function is passed to scandir(3) as a filter function.)
1227
*/
1228
int up_interface(const struct dirent *if_entry){
1229
if(if_entry->d_name[0] == '.'){
1230
return 0;
1231
}
1232
1233
struct ifreq ifr;
1234
if(not get_flags(if_entry->d_name, &ifr)){
1235
if(debug){
1236
fprintf(stderr, "Mandos plugin mandos-client: "
1237
"Failed to get flags for interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
/* Reject down interfaces */
1244
if(not (ifr.ifr_flags & IFF_UP)){
1245
if(debug){
1246
fprintf(stderr, "Mandos plugin mandos-client: "
1247
"Rejecting down interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
/* Reject non-running interfaces */
1254
if(not (ifr.ifr_flags & IFF_RUNNING)){
1255
if(debug){
1256
fprintf(stderr, "Mandos plugin mandos-client: "
1257
"Rejecting non-running interface \"%s\"\n",
1258
if_entry->d_name);
1259
}
1260
return 0;
1261
}
1262
1263
if(not good_flags(if_entry->d_name, &ifr)){
1264
return 0;
1265
}
1266
return 1;
1267
}
1268
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))
1269
1313
int notdotentries(const struct dirent *direntry){
1270
1314
/* Skip "." and ".." */
1271
1315
if(direntry->d_name[0] == '.'
1278
1322
}
1279
1323
1280
1324
/* Is this directory entry a runnable program? */
1325
__attribute__((nonnull, warn_unused_result))
1281
1326
int runnable_hook(const struct dirent *direntry){
1282
1327
int ret;
1283
1328
size_t sret;
1291
1336
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1292
1337
"abcdefghijklmnopqrstuvwxyz"
1293
1338
"0123456789"
1294
"_-");
1339
"_.-");
1295
1340
if((direntry->d_name)[sret] != '\0'){
1296
1341
/* Contains non-allowed characters */
1297
1342
if(debug){
1298
fprintf(stderr, "Mandos plugin mandos-client: "
1299
"Ignoring hook \"%s\" with bad name\n",
1300
direntry->d_name);
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1344
direntry->d_name);
1301
1345
}
1302
1346
return 0;
1303
1347
}
1304
1348
1305
char *fullname = NULL;
1306
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1307
if(ret < 0){
1308
perror_plus("asprintf");
1309
return 0;
1310
}
1311
1312
ret = stat(fullname, &st);
1349
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1313
1350
if(ret == -1){
1314
1351
if(debug){
1315
1352
perror_plus("Could not stat hook");
1319
1356
if(not (S_ISREG(st.st_mode))){
1320
1357
/* Not a regular file */
1321
1358
if(debug){
1322
fprintf(stderr, "Mandos plugin mandos-client: "
1323
"Ignoring hook \"%s\" - not a file\n",
1324
direntry->d_name);
1359
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1360
direntry->d_name);
1325
1361
}
1326
1362
return 0;
1327
1363
}
1328
1364
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1329
1365
/* Not executable */
1330
1366
if(debug){
1331
fprintf(stderr, "Mandos plugin mandos-client: "
1332
"Ignoring hook \"%s\" - not executable\n",
1333
direntry->d_name);
1367
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1368
direntry->d_name);
1334
1369
}
1335
1370
return 0;
1336
1371
}
1372
if(debug){
1373
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1374
direntry->d_name);
1375
}
1337
1376
return 1;
1338
1377
}
1339
1378
1340
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1379
__attribute__((nonnull, warn_unused_result))
1380
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1381
mandos_context *mc){
1341
1382
int ret;
1342
1383
struct timespec now;
1343
1384
struct timespec waited_time;
1344
1385
intmax_t block_time;
1345
1386
1346
1387
while(true){
1347
if(mc.current_server == NULL){
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Wait until first server is found. No timeout!\n");
1388
if(mc->current_server == NULL){
1389
if(debug){
1390
fprintf_plus(stderr, "Wait until first server is found."
1391
" No timeout!\n");
1351
1392
}
1352
1393
ret = avahi_simple_poll_iterate(s, -1);
1353
1394
} else {
1354
if (debug){
1355
fprintf(stderr, "Mandos plugin mandos-client: "
1356
"Check current_server if we should run it,"
1357
" or wait\n");
1395
if(debug){
1396
fprintf_plus(stderr, "Check current_server if we should run"
1397
" it, or wait\n");
1358
1398
}
1359
1399
/* the current time */
1360
1400
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1365
1405
/* Calculating in ms how long time between now and server
1366
1406
who we visted longest time ago. Now - last seen. */
1367
1407
waited_time.tv_sec = (now.tv_sec
1368
- mc.current_server->last_seen.tv_sec);
1408
- mc->current_server->last_seen.tv_sec);
1369
1409
waited_time.tv_nsec = (now.tv_nsec
1370
- mc.current_server->last_seen.tv_nsec);
1410
- mc->current_server->last_seen.tv_nsec);
1371
1411
/* total time is 10s/10,000ms.
1372
1412
Converting to s from ms by dividing by 1,000,
1373
1413
and ns to ms by dividing by 1,000,000. */
1375
1415
- ((intmax_t)waited_time.tv_sec * 1000))
1376
1416
- ((intmax_t)waited_time.tv_nsec / 1000000));
1377
1417
1378
if (debug){
1379
fprintf(stderr, "Mandos plugin mandos-client: "
1380
"Blocking for %" PRIdMAX " ms\n", block_time);
1418
if(debug){
1419
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1420
block_time);
1381
1421
}
1382
1422
1383
1423
if(block_time <= 0){
1384
ret = start_mandos_communication(mc.current_server->ip,
1385
mc.current_server->port,
1386
mc.current_server->if_index,
1387
mc.current_server->af);
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);
1388
1428
if(ret == 0){
1389
avahi_simple_poll_quit(mc.simple_poll);
1429
avahi_simple_poll_quit(s);
1390
1430
return 0;
1391
1431
}
1392
1432
ret = clock_gettime(CLOCK_MONOTONIC,
1393
&mc.current_server->last_seen);
1433
&mc->current_server->last_seen);
1394
1434
if(ret == -1){
1395
1435
perror_plus("clock_gettime");
1396
1436
return -1;
1397
1437
}
1398
mc.current_server = mc.current_server->next;
1438
mc->current_server = mc->current_server->next;
1399
1439
block_time = 0; /* Call avahi to find new Mandos
1400
1440
servers, but don't block */
1401
1441
}
1403
1443
ret = avahi_simple_poll_iterate(s, (int)block_time);
1404
1444
}
1405
1445
if(ret != 0){
1406
if (ret > 0 or errno != EINTR){
1446
if(ret > 0 or errno != EINTR){
1407
1447
return (ret != 1) ? ret : 0;
1408
1448
}
1409
1449
}
1410
1450
}
1411
1451
}
1412
1452
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
1413
1907
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 };
1414
1912
AvahiSServiceBrowser *sb = NULL;
1415
int error;
1913
error_t ret_errno;
1416
1914
int ret;
1417
1915
intmax_t tmpmax;
1418
1916
char *tmp;
1419
1917
int exitcode = EXIT_SUCCESS;
1420
const char *interface = "";
1421
struct ifreq network;
1422
int sd = -1;
1423
bool take_down_interface = false;
1424
uid_t uid;
1425
gid_t gid;
1426
char tempdir[] = "/tmp/mandosXXXXXX";
1427
bool tempdir_created = false;
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;
1428
1923
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1429
1924
const char *seckey = PATHDIR "/" SECKEY;
1430
1925
const char *pubkey = PATHDIR "/" PUBKEY;
1926
char *interfaces_hooks = NULL;
1431
1927
1432
1928
bool gnutls_initialized = false;
1433
1929
bool gpgme_initialized = false;
1495
1991
.group = 2 },
1496
1992
{ .name = "retry", .key = 132,
1497
1993
.arg = "SECONDS",
1498
.doc = "Retry interval used when denied by the mandos server",
1994
.doc = "Retry interval used when denied by the Mandos server",
1499
1995
.group = 2 },
1500
1996
{ .name = "network-hook-dir", .key = 133,
1501
1997
.arg = "DIR",
1524
2020
connect_to = arg;
1525
2021
break;
1526
2022
case 'i': /* --interface */
1527
interface = arg;
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
}
1528
2028
break;
1529
2029
case 's': /* --seckey */
1530
2030
seckey = arg;
1573
2073
argp_state_help(state, state->out_stream,
1574
2074
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1575
2075
case 'V': /* --version */
1576
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1577
fprintf(state->out_stream, "%s\n", argp_program_version);
2076
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1578
2077
exit(argp_err_exit_status);
1579
2078
break;
1580
2079
default:
1607
2106
{
1608
2107
/* Work around Debian bug #633582:
1609
2108
<http://bugs.debian.org/633582> */
1610
struct stat st;
1611
1612
/* Re-raise priviliges */
1613
errno = 0;
1614
ret = seteuid(0);
1615
if(ret == -1){
1616
perror_plus("seteuid");
1617
}
1618
1619
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1620
int seckey_fd = open(seckey, O_RDONLY);
1621
if(seckey_fd == -1){
1622
perror_plus("open");
1623
} else {
1624
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1625
if(ret == -1){
1626
perror_plus("fstat");
1627
} else {
1628
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1629
ret = fchown(seckey_fd, uid, gid);
1630
if(ret == -1){
1631
perror_plus("fchown");
1632
}
1633
}
1634
}
1635
TEMP_FAILURE_RETRY(close(seckey_fd));
1636
}
1637
}
1638
1639
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1640
int pubkey_fd = open(pubkey, O_RDONLY);
1641
if(pubkey_fd == -1){
1642
perror_plus("open");
1643
} else {
1644
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1645
if(ret == -1){
1646
perror_plus("fstat");
1647
} else {
1648
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1649
ret = fchown(pubkey_fd, uid, gid);
1650
if(ret == -1){
1651
perror_plus("fchown");
1652
}
1653
}
1654
}
1655
TEMP_FAILURE_RETRY(close(pubkey_fd));
1656
}
1657
}
1658
1659
/* Lower privileges */
1660
errno = 0;
1661
ret = seteuid(uid);
1662
if(ret == -1){
1663
perror_plus("seteuid");
1664
}
1665
}
1666
1667
/* Find network hooks and run them */
1668
{
1669
struct dirent **direntries;
1670
struct dirent *direntry;
1671
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1672
alphasort);
1673
if(numhooks == -1){
1674
perror_plus("scandir");
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");
1675
2115
} else {
1676
int devnull = open("/dev/null", O_RDONLY);
1677
for(int i = 0; i < numhooks; i++){
1678
direntry = direntries[0];
1679
char *fullname = NULL;
1680
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1681
if(ret < 0){
1682
perror_plus("asprintf");
1683
continue;
1684
}
1685
pid_t hook_pid = fork();
1686
if(hook_pid == 0){
1687
/* Child */
1688
dup2(devnull, STDIN_FILENO);
1689
close(devnull);
1690
dup2(STDERR_FILENO, STDOUT_FILENO);
1691
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1692
if(ret == -1){
1693
perror_plus("setenv");
1694
exit(1);
1695
}
1696
ret = setenv("DEVICE", interface, 1);
1697
if(ret == -1){
1698
perror_plus("setenv");
1699
exit(1);
1700
}
1701
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1702
if(ret == -1){
1703
perror_plus("setenv");
1704
exit(1);
1705
}
1706
ret = setenv("MODE", "start", 1);
1707
if(ret == -1){
1708
perror_plus("setenv");
1709
exit(1);
1710
}
1711
char *delaystring;
1712
ret = asprintf(&delaystring, "%f", delay);
1713
if(ret == -1){
1714
perror_plus("asprintf");
1715
exit(1);
1716
}
1717
ret = setenv("DELAY", delaystring, 1);
1718
if(ret == -1){
1719
free(delaystring);
1720
perror_plus("setenv");
1721
exit(1);
1722
}
1723
free(delaystring);
1724
ret = execl(fullname, direntry->d_name, "start", NULL);
1725
perror_plus("execl");
1726
} else {
1727
int status;
1728
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1729
perror_plus("waitpid");
1730
free(fullname);
1731
continue;
1732
}
1733
if(WIFEXITED(status)){
1734
if(WEXITSTATUS(status) != 0){
1735
fprintf(stderr, "Mandos plugin mandos-client: "
1736
"Warning: network hook \"%s\" exited"
1737
" with status %d\n", direntry->d_name,
1738
WEXITSTATUS(status));
1739
free(fullname);
1740
continue;
1741
}
1742
} else if(WIFSIGNALED(status)){
1743
fprintf(stderr, "Mandos plugin mandos-client: "
1744
"Warning: network hook \"%s\" died by"
1745
" signal %d\n", direntry->d_name,
1746
WTERMSIG(status));
1747
free(fullname);
1748
continue;
1749
} else {
1750
fprintf(stderr, "Mandos plugin mandos-client: "
1751
"Warning: network hook \"%s\" crashed\n",
1752
direntry->d_name);
1753
free(fullname);
1754
continue;
1755
}
1756
}
1757
free(fullname);
1758
if(quit_now){
1759
goto end;
1760
}
1761
}
1762
close(devnull);
1763
}
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);
1764
2199
}
1765
2200
1766
2201
if(not debug){
1767
2202
avahi_set_log_function(empty_log);
1768
2203
}
1769
2204
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1774
alphasort);
1775
if(ret == 0){
1776
/* No up interfaces, look for any good interfaces */
1777
free(direntries);
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1779
alphasort);
1780
}
1781
if(ret >= 1){
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1784
if(debug){
1785
fprintf(stderr, "Mandos plugin mandos-client: "
1786
"Using interface \"%s\"\n", interface);
1787
}
1788
if(interface == NULL){
1789
perror_plus("malloc");
1790
free(direntries);
1791
exitcode = EXIT_FAILURE;
1792
goto end;
1793
}
1794
free(direntries);
1795
} else {
1796
free(direntries);
1797
fprintf(stderr, "Mandos plugin mandos-client: "
1798
"Could not find a network interface\n");
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
}
1803
1804
2205
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1805
2206
from the signal handler */
1806
2207
/* Initialize the pseudo-RNG for Avahi */
1807
2208
srand((unsigned int) time(NULL));
1808
mc.simple_poll = avahi_simple_poll_new();
1809
if(mc.simple_poll == NULL){
1810
fprintf(stderr, "Mandos plugin mandos-client: "
1811
"Avahi: Failed to create simple poll object.\n");
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");
1812
2213
exitcode = EX_UNAVAILABLE;
1813
2214
goto end;
1814
2215
}
1876
2277
}
1877
2278
}
1878
2279
1879
/* If the interface is down, bring it up */
1880
if(strcmp(interface, "none") != 0){
1881
if_index = (AvahiIfIndex) if_nametoindex(interface);
1882
if(if_index == 0){
1883
fprintf(stderr, "Mandos plugin mandos-client: "
1884
"No such interface: \"%s\"\n", interface);
1885
exitcode = EX_UNAVAILABLE;
1886
goto end;
1887
}
1888
1889
if(quit_now){
1890
goto end;
1891
}
1892
1893
/* Re-raise priviliges */
1894
errno = 0;
1895
ret = seteuid(0);
1896
if(ret == -1){
1897
perror_plus("seteuid");
1898
}
1899
1900
#ifdef __linux__
1901
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1902
messages about the network interface to mess up the prompt */
1903
ret = klogctl(8, NULL, 5);
1904
bool restore_loglevel = true;
1905
if(ret == -1){
1906
restore_loglevel = false;
1907
perror_plus("klogctl");
1908
}
1909
#endif /* __linux__ */
1910
1911
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1912
if(sd < 0){
1913
perror_plus("socket");
1914
exitcode = EX_OSERR;
1915
#ifdef __linux__
1916
if(restore_loglevel){
1917
ret = klogctl(7, NULL, 0);
1918
if(ret == -1){
1919
perror_plus("klogctl");
1920
}
1921
}
1922
#endif /* __linux__ */
1923
/* Lower privileges */
1924
errno = 0;
1925
ret = seteuid(uid);
1926
if(ret == -1){
1927
perror_plus("seteuid");
1928
}
1929
goto end;
1930
}
1931
strcpy(network.ifr_name, interface);
1932
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1933
if(ret == -1){
1934
perror_plus("ioctl SIOCGIFFLAGS");
1935
#ifdef __linux__
1936
if(restore_loglevel){
1937
ret = klogctl(7, NULL, 0);
1938
if(ret == -1){
1939
perror_plus("klogctl");
1940
}
1941
}
1942
#endif /* __linux__ */
1943
exitcode = EX_OSERR;
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1950
goto end;
1951
}
1952
if((network.ifr_flags & IFF_UP) == 0){
1953
network.ifr_flags |= IFF_UP;
1954
take_down_interface = true;
1955
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1956
if(ret == -1){
1957
take_down_interface = false;
1958
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1959
exitcode = EX_OSERR;
1960
#ifdef __linux__
1961
if(restore_loglevel){
1962
ret = klogctl(7, NULL, 0);
1963
if(ret == -1){
1964
perror_plus("klogctl");
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);
2302
} 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;
1965
2327
}
1966
2328
}
1967
#endif /* __linux__ */
1968
/* Lower privileges */
1969
errno = 0;
1970
ret = seteuid(uid);
1971
if(ret == -1){
1972
perror_plus("seteuid");
1973
}
1974
goto end;
1975
}
1976
}
1977
/* Sleep checking until interface is running.
1978
Check every 0.25s, up to total time of delay */
1979
for(int i=0; i < delay * 4; i++){
1980
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1981
if(ret == -1){
1982
perror_plus("ioctl SIOCGIFFLAGS");
1983
} else if(network.ifr_flags & IFF_RUNNING){
1984
2329
break;
1985
2330
}
1986
struct timespec sleeptime = { .tv_nsec = 250000000 };
1987
ret = nanosleep(&sleeptime, NULL);
1988
if(ret == -1 and errno != EINTR){
1989
perror_plus("nanosleep");
1990
}
1991
}
1992
if(not take_down_interface){
1993
/* We won't need the socket anymore */
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
if(ret == -1){
1996
perror_plus("close");
1997
}
1998
}
1999
#ifdef __linux__
2000
if(restore_loglevel){
2001
/* Restores kernel loglevel to default */
2002
ret = klogctl(7, NULL, 0);
2003
if(ret == -1){
2004
perror_plus("klogctl");
2005
}
2006
}
2007
#endif /* __linux__ */
2008
/* Lower privileges */
2009
errno = 0;
2010
if(take_down_interface){
2011
/* Lower privileges */
2012
ret = seteuid(uid);
2013
if(ret == -1){
2014
perror_plus("seteuid");
2015
}
2016
} else {
2017
/* Lower privileges permanently */
2018
ret = setuid(uid);
2019
if(ret == -1){
2020
perror_plus("setuid");
2021
}
2022
}
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);
2023
2358
}
2024
2359
2025
2360
if(quit_now){
2026
2361
goto end;
2027
2362
}
2028
2363
2029
ret = init_gnutls_global(pubkey, seckey);
2364
ret = init_gnutls_global(pubkey, seckey, &mc);
2030
2365
if(ret == -1){
2031
fprintf(stderr, "Mandos plugin mandos-client: "
2032
"init_gnutls_global failed\n");
2366
fprintf_plus(stderr, "init_gnutls_global failed\n");
2033
2367
exitcode = EX_UNAVAILABLE;
2034
2368
goto end;
2035
2369
} else {
2040
2374
goto end;
2041
2375
}
2042
2376
2043
if(mkdtemp(tempdir) == NULL){
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){
2044
2387
perror_plus("mkdtemp");
2045
2388
goto end;
2046
2389
}
2047
tempdir_created = true;
2048
2390
2049
2391
if(quit_now){
2050
2392
goto end;
2051
2393
}
2052
2394
2053
if(not init_gpgme(pubkey, seckey, tempdir)){
2054
fprintf(stderr, "Mandos plugin mandos-client: "
2055
"init_gpgme failed\n");
2395
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2396
fprintf_plus(stderr, "init_gpgme failed\n");
2056
2397
exitcode = EX_UNAVAILABLE;
2057
2398
goto end;
2058
2399
} else {
2067
2408
/* Connect directly, do not use Zeroconf */
2068
2409
/* (Mainly meant for debugging) */
2069
2410
char *address = strrchr(connect_to, ':');
2411
2070
2412
if(address == NULL){
2071
fprintf(stderr, "Mandos plugin mandos-client: "
2072
"No colon in address\n");
2413
fprintf_plus(stderr, "No colon in address\n");
2073
2414
exitcode = EX_USAGE;
2074
2415
goto end;
2075
2416
}
2078
2419
goto end;
2079
2420
}
2080
2421
2081
uint16_t port;
2422
in_port_t port;
2082
2423
errno = 0;
2083
2424
tmpmax = strtoimax(address+1, &tmp, 10);
2084
2425
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2085
or tmpmax != (uint16_t)tmpmax){
2086
fprintf(stderr, "Mandos plugin mandos-client: "
2087
"Bad port number\n");
2426
or tmpmax != (in_port_t)tmpmax){
2427
fprintf_plus(stderr, "Bad port number\n");
2088
2428
exitcode = EX_USAGE;
2089
2429
goto end;
2090
2430
}
2091
2431
2092
2432
if(quit_now){
2093
2433
goto end;
2094
2434
}
2095
2435
2096
port = (uint16_t)tmpmax;
2436
port = (in_port_t)tmpmax;
2097
2437
*address = '\0';
2098
2438
/* Colon in address indicates IPv6 */
2099
2439
int af;
2115
2455
}
2116
2456
2117
2457
while(not quit_now){
2118
ret = start_mandos_communication(address, port, if_index, af);
2458
ret = start_mandos_communication(address, port, if_index, af,
2459
&mc);
2119
2460
if(quit_now or ret == 0){
2120
2461
break;
2121
2462
}
2122
2463
if(debug){
2123
fprintf(stderr, "Mandos plugin mandos-client: "
2124
"Retrying in %d seconds\n", (int)retry_interval);
2464
fprintf_plus(stderr, "Retrying in %d seconds\n",
2465
(int)retry_interval);
2125
2466
}
2126
sleep((int)retry_interval);
2467
sleep((unsigned int)retry_interval);
2127
2468
}
2128
2469
2129
if (not quit_now){
2470
if(not quit_now){
2130
2471
exitcode = EXIT_SUCCESS;
2131
2472
}
2132
2473
2147
2488
config.publish_domain = 0;
2148
2489
2149
2490
/* Allocate a new server */
2150
mc.server = avahi_server_new(avahi_simple_poll_get
2151
(mc.simple_poll), &config, NULL,
2152
NULL, &error);
2491
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2492
&config, NULL, NULL, &ret_errno);
2153
2493
2154
2494
/* Free the Avahi configuration data */
2155
2495
avahi_server_config_free(&config);
2157
2497
2158
2498
/* Check if creating the Avahi server object succeeded */
2159
2499
if(mc.server == NULL){
2160
fprintf(stderr, "Mandos plugin mandos-client: "
2161
"Failed to create Avahi server: %s\n",
2162
avahi_strerror(error));
2500
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2501
avahi_strerror(ret_errno));
2163
2502
exitcode = EX_UNAVAILABLE;
2164
2503
goto end;
2165
2504
}
2171
2510
/* Create the Avahi service browser */
2172
2511
sb = avahi_s_service_browser_new(mc.server, if_index,
2173
2512
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2174
NULL, 0, browse_callback, NULL);
2513
NULL, 0, browse_callback,
2514
(void *)&mc);
2175
2515
if(sb == NULL){
2176
fprintf(stderr, "Mandos plugin mandos-client: "
2177
"Failed to create service browser: %s\n",
2178
avahi_strerror(avahi_server_errno(mc.server)));
2516
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2517
avahi_strerror(avahi_server_errno(mc.server)));
2179
2518
exitcode = EX_UNAVAILABLE;
2180
2519
goto end;
2181
2520
}
2187
2526
/* Run the main loop */
2188
2527
2189
2528
if(debug){
2190
fprintf(stderr, "Mandos plugin mandos-client: "
2191
"Starting Avahi loop search\n");
2529
fprintf_plus(stderr, "Starting Avahi loop search\n");
2192
2530
}
2193
2194
ret = avahi_loop_with_timeout(mc.simple_poll,
2195
(int)(retry_interval * 1000));
2531
2532
ret = avahi_loop_with_timeout(simple_poll,
2533
(int)(retry_interval * 1000), &mc);
2196
2534
if(debug){
2197
fprintf(stderr, "Mandos plugin mandos-client: "
2198
"avahi_loop_with_timeout exited %s\n",
2199
(ret == 0) ? "successfully" : "with error");
2535
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2536
(ret == 0) ? "successfully" : "with error");
2200
2537
}
2201
2538
2202
2539
end:
2203
2540
2204
2541
if(debug){
2205
fprintf(stderr, "Mandos plugin mandos-client: "
2206
"%s exiting\n", argv[0]);
2542
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2207
2543
}
2208
2544
2209
2545
/* Cleanup things */
2546
free(mc.interfaces);
2547
2210
2548
if(sb != NULL)
2211
2549
avahi_s_service_browser_free(sb);
2212
2550
2213
2551
if(mc.server != NULL)
2214
2552
avahi_server_free(mc.server);
2215
2553
2216
if(mc.simple_poll != NULL)
2217
avahi_simple_poll_free(mc.simple_poll);
2554
if(simple_poll != NULL)
2555
avahi_simple_poll_free(simple_poll);
2218
2556
2219
2557
if(gnutls_initialized){
2220
2558
gnutls_certificate_free_credentials(mc.cred);
2225
2563
if(gpgme_initialized){
2226
2564
gpgme_release(mc.ctx);
2227
2565
}
2228
2566
2229
2567
/* Cleans up the circular linked list of Mandos servers the client
2230
2568
has seen */
2231
2569
if(mc.current_server != NULL){
2237
2575
}
2238
2576
}
2239
2577
2240
/* XXX run network hooks "stop" here */
2241
2242
/* Take down the network interface */
2243
if(take_down_interface){
2244
/* Re-raise priviliges */
2245
errno = 0;
2246
ret = seteuid(0);
2247
if(ret == -1){
2248
perror_plus("seteuid");
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
}
2249
2606
}
2250
if(geteuid() == 0){
2251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2252
if(ret == -1){
2253
perror_plus("ioctl SIOCGIFFLAGS");
2254
} else if(network.ifr_flags & IFF_UP){
2255
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2256
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2257
if(ret == -1){
2258
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2259
}
2260
}
2261
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2262
if(ret == -1){
2263
perror_plus("close");
2264
}
2265
/* Lower privileges permanently */
2266
errno = 0;
2267
ret = setuid(uid);
2268
if(ret == -1){
2269
perror_plus("setuid");
2270
}
2607
2608
ret_errno = lower_privileges_permanently();
2609
if(ret_errno != 0){
2610
perror_plus("Failed to lower privileges permanently");
2271
2611
}
2272
2612
}
2273
2613
2614
free(interfaces_to_take_down);
2615
free(interfaces_hooks);
2616
2274
2617
/* Removes the GPGME temp directory and all files inside */
2275
if(tempdir_created){
2618
if(tempdir != NULL){
2276
2619
struct dirent **direntries = NULL;
2277
2620
struct dirent *direntry = NULL;
2278
2621
int numentries = scandir(tempdir, &direntries, notdotentries,
2279
2622
alphasort);
2280
if (numentries > 0){
2623
if(numentries > 0){
2281
2624
for(int i = 0; i < numentries; i++){
2282
2625
direntry = direntries[i];
2283
2626
char *fullname = NULL;
2289
2632
}
2290
2633
ret = remove(fullname);
2291
2634
if(ret == -1){
2292
fprintf(stderr, "Mandos plugin mandos-client: "
2293
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2635
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2636
strerror(errno));
2294
2637
}
2295
2638
free(fullname);
2296
2639
}
2297
2640
}
2298
2641
2299
2642
/* need to clean even if 0 because man page doesn't specify */
2300
2643
free(direntries);
2301
if (numentries == -1){
2644
if(numentries == -1){
2302
2645
perror_plus("scandir");
2303
2646
}
2304
2647
ret = rmdir(tempdir);
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Version: 2.0.2.dev0