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- Committer: teddy at bsnet
- Date: 2011-11-12 18:04:35 UTC
- mto: (505.2.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@fukt.bsnet.se-20111112180435-kdui7a6o7jfpgz9r
* plugins.d/mandos-client.c (SYNOPSIS, OPTIONS): Document
"--network-hook-dir"
option.
"--network-hook-dir"
option.
- 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
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
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() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
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
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
78
#include <iso646.h> /* not, or, and */
80
79
#include <argp.h> /* struct argp_option, error_t, struct
81
80
argp_state, struct argp,
88
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
89
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
90
99
91
#ifdef __linux__
100
92
#include <sys/klog.h> /* klogctl() */
118
110
init_gnutls_session(),
119
111
GNUTLS_* */
120
112
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
123
115
124
116
/* GPGME */
125
117
#include <gpgme.h> /* All GPGME types, constants and
142
134
static const char sys_class_net[] = "/sys/class/net";
143
135
char *connect_to = NULL;
144
136
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
137
149
138
/* Doubly linked list that need to be circularly linked when used */
150
139
typedef struct server{
151
140
const char *ip;
152
in_port_t port;
141
uint16_t port;
153
142
AvahiIfIndex if_index;
154
143
int af;
155
144
struct timespec last_seen;
159
148
160
149
/* Used for passing in values through the Avahi callback functions */
161
150
typedef struct {
151
AvahiSimplePoll *simple_poll;
162
152
AvahiServer *server;
163
153
gnutls_certificate_credentials_t cred;
164
154
unsigned int dh_bits;
166
156
const char *priority;
167
157
gpgme_ctx_t ctx;
168
158
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
159
} mandos_context;
172
160
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
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 };
175
166
176
167
sig_atomic_t quit_now = 0;
177
168
int signal_received = 0;
178
169
179
170
/* Function to use when printing errors */
180
171
void perror_plus(const char *print_text){
181
int e = errno;
182
172
fprintf(stderr, "Mandos plugin %s: ",
183
173
program_invocation_short_name);
184
errno = e;
185
174
perror(print_text);
186
175
}
187
176
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
198
177
/*
199
178
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
179
* bytes. "buffer_capacity" is how much is currently allocated,
201
180
* "buffer_length" is how much is already used.
202
181
*/
203
__attribute__((nonnull, warn_unused_result))
204
182
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
183
size_t buffer_capacity){
206
184
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
186
if(buffer == NULL){
213
187
return 0;
214
188
}
215
*buffer = new_buf;
216
189
buffer_capacity += BUFFER_SIZE;
217
190
}
218
191
return buffer_capacity;
219
192
}
220
193
221
194
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
195
int add_server(const char *ip, uint16_t port,
196
AvahiIfIndex if_index,
197
int af){
225
198
int ret;
226
199
server *new_server = malloc(sizeof(server));
227
200
if(new_server == NULL){
228
201
perror_plus("malloc");
229
return false;
202
return -1;
230
203
}
231
204
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
205
.port = port,
206
.if_index = if_index,
207
.af = af };
235
208
if(new_server->ip == NULL){
236
209
perror_plus("strdup");
237
return false;
238
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
210
return -1;
243
211
}
244
212
/* Special case of first server */
245
if(*current_server == NULL){
213
if (mc.current_server == NULL){
246
214
new_server->next = new_server;
247
215
new_server->prev = new_server;
248
*current_server = new_server;
216
mc.current_server = new_server;
217
/* Place the new server last in the list */
249
218
} else {
250
/* Place the new server last in the list */
251
new_server->next = *current_server;
252
new_server->prev = (*current_server)->prev;
219
new_server->next = mc.current_server;
220
new_server->prev = mc.current_server->prev;
253
221
new_server->prev->next = new_server;
254
(*current_server)->prev = new_server;
255
}
256
return true;
222
mc.current_server->prev = new_server;
223
}
224
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
225
if(ret == -1){
226
perror_plus("clock_gettime");
227
return -1;
228
}
229
return 0;
257
230
}
258
231
259
232
/*
260
233
* Initialize GPGME.
261
234
*/
262
__attribute__((nonnull, warn_unused_result))
263
static bool init_gpgme(const char * const seckey,
264
const char * const pubkey,
265
const char * const tempdir,
266
mandos_context *mc){
235
static bool init_gpgme(const char *seckey,
236
const char *pubkey, const char *tempdir){
267
237
gpgme_error_t rc;
268
238
gpgme_engine_info_t engine_info;
269
239
240
270
241
/*
271
242
* Helper function to insert pub and seckey to the engine keyring.
272
243
*/
273
bool import_key(const char * const filename){
244
bool import_key(const char *filename){
274
245
int ret;
275
246
int fd;
276
247
gpgme_data_t pgp_data;
283
254
284
255
rc = gpgme_data_new_from_fd(&pgp_data, fd);
285
256
if(rc != GPG_ERR_NO_ERROR){
286
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
257
fprintf(stderr, "Mandos plugin mandos-client: "
258
"bad gpgme_data_new_from_fd: %s: %s\n",
259
gpgme_strsource(rc), gpgme_strerror(rc));
288
260
return false;
289
261
}
290
262
291
rc = gpgme_op_import(mc->ctx, pgp_data);
263
rc = gpgme_op_import(mc.ctx, pgp_data);
292
264
if(rc != GPG_ERR_NO_ERROR){
293
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
265
fprintf(stderr, "Mandos plugin mandos-client: "
266
"bad gpgme_op_import: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
295
268
return false;
296
269
}
297
270
304
277
}
305
278
306
279
if(debug){
307
fprintf_plus(stderr, "Initializing GPGME\n");
280
fprintf(stderr, "Mandos plugin mandos-client: "
281
"Initializing GPGME\n");
308
282
}
309
283
310
284
/* Init GPGME */
311
285
gpgme_check_version(NULL);
312
286
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
313
287
if(rc != GPG_ERR_NO_ERROR){
314
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
315
gpgme_strsource(rc), gpgme_strerror(rc));
288
fprintf(stderr, "Mandos plugin mandos-client: "
289
"bad gpgme_engine_check_version: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
316
291
return false;
317
292
}
318
293
319
294
/* Set GPGME home directory for the OpenPGP engine only */
320
295
rc = gpgme_get_engine_info(&engine_info);
321
296
if(rc != GPG_ERR_NO_ERROR){
322
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
323
gpgme_strsource(rc), gpgme_strerror(rc));
297
fprintf(stderr, "Mandos plugin mandos-client: "
298
"bad gpgme_get_engine_info: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
324
300
return false;
325
301
}
326
302
while(engine_info != NULL){
332
308
engine_info = engine_info->next;
333
309
}
334
310
if(engine_info == NULL){
335
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
336
tempdir);
311
fprintf(stderr, "Mandos plugin mandos-client: "
312
"Could not set GPGME home dir to %s\n", tempdir);
337
313
return false;
338
314
}
339
315
340
316
/* Create new GPGME "context" */
341
rc = gpgme_new(&(mc->ctx));
317
rc = gpgme_new(&(mc.ctx));
342
318
if(rc != GPG_ERR_NO_ERROR){
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
345
gpgme_strerror(rc));
319
fprintf(stderr, "Mandos plugin mandos-client: "
320
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
321
gpgme_strerror(rc));
346
322
return false;
347
323
}
348
324
357
333
* Decrypt OpenPGP data.
358
334
* Returns -1 on error
359
335
*/
360
__attribute__((nonnull, warn_unused_result))
361
336
static ssize_t pgp_packet_decrypt(const char *cryptotext,
362
337
size_t crypto_size,
363
char **plaintext,
364
mandos_context *mc){
338
char **plaintext){
365
339
gpgme_data_t dh_crypto, dh_plain;
366
340
gpgme_error_t rc;
367
341
ssize_t ret;
369
343
ssize_t plaintext_length = 0;
370
344
371
345
if(debug){
372
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
346
fprintf(stderr, "Mandos plugin mandos-client: "
347
"Trying to decrypt OpenPGP data\n");
373
348
}
374
349
375
350
/* Create new GPGME data buffer from memory cryptotext */
376
351
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
377
352
0);
378
353
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
354
fprintf(stderr, "Mandos plugin mandos-client: "
355
"bad gpgme_data_new_from_mem: %s: %s\n",
356
gpgme_strsource(rc), gpgme_strerror(rc));
381
357
return -1;
382
358
}
383
359
384
360
/* Create new empty GPGME data buffer for the plaintext */
385
361
rc = gpgme_data_new(&dh_plain);
386
362
if(rc != GPG_ERR_NO_ERROR){
387
fprintf_plus(stderr, "Mandos plugin mandos-client: "
388
"bad gpgme_data_new: %s: %s\n",
389
gpgme_strsource(rc), gpgme_strerror(rc));
363
fprintf(stderr, "Mandos plugin mandos-client: "
364
"bad gpgme_data_new: %s: %s\n",
365
gpgme_strsource(rc), gpgme_strerror(rc));
390
366
gpgme_data_release(dh_crypto);
391
367
return -1;
392
368
}
393
369
394
370
/* Decrypt data from the cryptotext data buffer to the plaintext
395
371
data buffer */
396
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
372
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
397
373
if(rc != GPG_ERR_NO_ERROR){
398
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
374
fprintf(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_op_decrypt: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
400
377
plaintext_length = -1;
401
378
if(debug){
402
379
gpgme_decrypt_result_t result;
403
result = gpgme_op_decrypt_result(mc->ctx);
380
result = gpgme_op_decrypt_result(mc.ctx);
404
381
if(result == NULL){
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
382
fprintf(stderr, "Mandos plugin mandos-client: "
383
"gpgme_op_decrypt_result failed\n");
406
384
} else {
407
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
408
result->unsupported_algorithm);
409
fprintf_plus(stderr, "Wrong key usage: %u\n",
410
result->wrong_key_usage);
385
fprintf(stderr, "Mandos plugin mandos-client: "
386
"Unsupported algorithm: %s\n",
387
result->unsupported_algorithm);
388
fprintf(stderr, "Mandos plugin mandos-client: "
389
"Wrong key usage: %u\n",
390
result->wrong_key_usage);
411
391
if(result->file_name != NULL){
412
fprintf_plus(stderr, "File name: %s\n", result->file_name);
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"File name: %s\n", result->file_name);
413
394
}
414
395
gpgme_recipient_t recipient;
415
396
recipient = result->recipients;
416
397
while(recipient != NULL){
417
fprintf_plus(stderr, "Public key algorithm: %s\n",
418
gpgme_pubkey_algo_name
419
(recipient->pubkey_algo));
420
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
421
fprintf_plus(stderr, "Secret key available: %s\n",
422
recipient->status == GPG_ERR_NO_SECKEY
423
? "No" : "Yes");
398
fprintf(stderr, "Mandos plugin mandos-client: "
399
"Public key algorithm: %s\n",
400
gpgme_pubkey_algo_name(recipient->pubkey_algo));
401
fprintf(stderr, "Mandos plugin mandos-client: "
402
"Key ID: %s\n", recipient->keyid);
403
fprintf(stderr, "Mandos plugin mandos-client: "
404
"Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
406
? "No" : "Yes");
424
407
recipient = recipient->next;
425
408
}
426
409
}
429
412
}
430
413
431
414
if(debug){
432
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
415
fprintf(stderr, "Mandos plugin mandos-client: "
416
"Decryption of OpenPGP data succeeded\n");
433
417
}
434
418
435
419
/* Seek back to the beginning of the GPGME plaintext data buffer */
442
426
*plaintext = NULL;
443
427
while(true){
444
428
plaintext_capacity = incbuffer(plaintext,
445
(size_t)plaintext_length,
446
plaintext_capacity);
429
(size_t)plaintext_length,
430
plaintext_capacity);
447
431
if(plaintext_capacity == 0){
448
perror_plus("incbuffer");
449
plaintext_length = -1;
450
goto decrypt_end;
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
451
435
}
452
436
453
437
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
466
450
}
467
451
468
452
if(debug){
469
fprintf_plus(stderr, "Decrypted password is: ");
453
fprintf(stderr, "Mandos plugin mandos-client: "
454
"Decrypted password is: ");
470
455
for(ssize_t i = 0; i < plaintext_length; i++){
471
456
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
472
457
}
483
468
return plaintext_length;
484
469
}
485
470
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
488
const char *ret = gnutls_strerror(value);
471
static const char * safer_gnutls_strerror(int value){
472
const char *ret = gnutls_strerror(value); /* Spurious warning from
473
-Wunreachable-code */
489
474
if(ret == NULL)
490
475
ret = "(unknown)";
491
476
return ret;
492
477
}
493
478
494
479
/* GnuTLS log function callback */
495
__attribute__((nonnull))
496
480
static void debuggnutls(__attribute__((unused)) int level,
497
481
const char* string){
498
fprintf_plus(stderr, "GnuTLS: %s", string);
482
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
499
483
}
500
484
501
__attribute__((nonnull, warn_unused_result))
502
485
static int init_gnutls_global(const char *pubkeyfilename,
503
const char *seckeyfilename,
504
mandos_context *mc){
486
const char *seckeyfilename){
505
487
int ret;
506
488
507
489
if(debug){
508
fprintf_plus(stderr, "Initializing GnuTLS\n");
490
fprintf(stderr, "Mandos plugin mandos-client: "
491
"Initializing GnuTLS\n");
509
492
}
510
493
511
494
ret = gnutls_global_init();
512
495
if(ret != GNUTLS_E_SUCCESS){
513
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
514
safer_gnutls_strerror(ret));
496
fprintf(stderr, "Mandos plugin mandos-client: "
497
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
515
498
return -1;
516
499
}
517
500
524
507
}
525
508
526
509
/* OpenPGP credentials */
527
ret = gnutls_certificate_allocate_credentials(&mc->cred);
510
ret = gnutls_certificate_allocate_credentials(&mc.cred);
528
511
if(ret != GNUTLS_E_SUCCESS){
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
530
safer_gnutls_strerror(ret));
512
fprintf(stderr, "Mandos plugin mandos-client: "
513
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
531
514
gnutls_global_deinit();
532
515
return -1;
533
516
}
534
517
535
518
if(debug){
536
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
537
" secret key %s as GnuTLS credentials\n",
538
pubkeyfilename,
539
seckeyfilename);
519
fprintf(stderr, "Mandos plugin mandos-client: "
520
"Attempting to use OpenPGP public key %s and"
521
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
522
seckeyfilename);
540
523
}
541
524
542
525
ret = gnutls_certificate_set_openpgp_key_file
543
(mc->cred, pubkeyfilename, seckeyfilename,
526
(mc.cred, pubkeyfilename, seckeyfilename,
544
527
GNUTLS_OPENPGP_FMT_BASE64);
545
528
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr,
547
"Error[%d] while reading the OpenPGP key pair ('%s',"
548
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
549
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
550
safer_gnutls_strerror(ret));
529
fprintf(stderr,
530
"Mandos plugin mandos-client: "
531
"Error[%d] while reading the OpenPGP key pair ('%s',"
532
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
533
fprintf(stderr, "Mandos plugin mandos-client: "
534
"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
551
535
goto globalfail;
552
536
}
553
537
554
538
/* GnuTLS server initialization */
555
ret = gnutls_dh_params_init(&mc->dh_params);
539
ret = gnutls_dh_params_init(&mc.dh_params);
556
540
if(ret != GNUTLS_E_SUCCESS){
557
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
558
" initialization: %s\n",
559
safer_gnutls_strerror(ret));
541
fprintf(stderr, "Mandos plugin mandos-client: "
542
"Error in GnuTLS DH parameter initialization:"
543
" %s\n", safer_gnutls_strerror(ret));
560
544
goto globalfail;
561
545
}
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
563
547
if(ret != GNUTLS_E_SUCCESS){
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
safer_gnutls_strerror(ret));
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS prime generation: %s\n",
550
safer_gnutls_strerror(ret));
566
551
goto globalfail;
567
552
}
568
553
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
554
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
570
555
571
556
return 0;
572
557
573
558
globalfail:
574
559
575
gnutls_certificate_free_credentials(mc->cred);
560
gnutls_certificate_free_credentials(mc.cred);
576
561
gnutls_global_deinit();
577
gnutls_dh_params_deinit(mc->dh_params);
562
gnutls_dh_params_deinit(mc.dh_params);
578
563
return -1;
579
564
}
580
565
581
__attribute__((nonnull, warn_unused_result))
582
static int init_gnutls_session(gnutls_session_t *session,
583
mandos_context *mc){
566
static int init_gnutls_session(gnutls_session_t *session){
584
567
int ret;
585
568
/* GnuTLS session creation */
586
569
do {
590
573
}
591
574
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
592
575
if(ret != GNUTLS_E_SUCCESS){
593
fprintf_plus(stderr,
594
"Error in GnuTLS session initialization: %s\n",
595
safer_gnutls_strerror(ret));
576
fprintf(stderr, "Mandos plugin mandos-client: "
577
"Error in GnuTLS session initialization: %s\n",
578
safer_gnutls_strerror(ret));
596
579
}
597
580
598
581
{
599
582
const char *err;
600
583
do {
601
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
584
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
602
585
if(quit_now){
603
586
gnutls_deinit(*session);
604
587
return -1;
605
588
}
606
589
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
607
590
if(ret != GNUTLS_E_SUCCESS){
608
fprintf_plus(stderr, "Syntax error at: %s\n", err);
609
fprintf_plus(stderr, "GnuTLS error: %s\n",
610
safer_gnutls_strerror(ret));
591
fprintf(stderr, "Mandos plugin mandos-client: "
592
"Syntax error at: %s\n", err);
593
fprintf(stderr, "Mandos plugin mandos-client: "
594
"GnuTLS error: %s\n", safer_gnutls_strerror(ret));
611
595
gnutls_deinit(*session);
612
596
return -1;
613
597
}
615
599
616
600
do {
617
601
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
618
mc->cred);
602
mc.cred);
619
603
if(quit_now){
620
604
gnutls_deinit(*session);
621
605
return -1;
622
606
}
623
607
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
624
608
if(ret != GNUTLS_E_SUCCESS){
625
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
626
safer_gnutls_strerror(ret));
609
fprintf(stderr, "Mandos plugin mandos-client: "
610
"Error setting GnuTLS credentials: %s\n",
611
safer_gnutls_strerror(ret));
627
612
gnutls_deinit(*session);
628
613
return -1;
629
614
}
631
616
/* ignore client certificate if any. */
632
617
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
633
618
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
619
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
635
620
636
621
return 0;
637
622
}
641
626
__attribute__((unused)) const char *txt){}
642
627
643
628
/* Called when a Mandos server is found */
644
__attribute__((nonnull, warn_unused_result))
645
static int start_mandos_communication(const char *ip, in_port_t port,
629
static int start_mandos_communication(const char *ip, uint16_t port,
646
630
AvahiIfIndex if_index,
647
int af, mandos_context *mc){
631
int af){
648
632
int ret, tcp_sd = -1;
649
633
ssize_t sret;
650
struct sockaddr_storage to;
634
union {
635
struct sockaddr_in in;
636
struct sockaddr_in6 in6;
637
} to;
651
638
char *buffer = NULL;
652
639
char *decrypted_buffer = NULL;
653
640
size_t buffer_length = 0;
672
659
pf = PF_INET;
673
660
break;
674
661
default:
675
fprintf_plus(stderr, "Bad address family: %d\n", af);
662
fprintf(stderr, "Mandos plugin mandos-client: "
663
"Bad address family: %d\n", af);
676
664
errno = EINVAL;
677
665
return -1;
678
666
}
679
667
680
/* If the interface is specified and we have a list of interfaces */
681
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
682
/* Check if the interface is one of the interfaces we are using */
683
bool match = false;
684
{
685
char *interface = NULL;
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
688
if(if_nametoindex(interface) == (unsigned int)if_index){
689
match = true;
690
break;
691
}
692
}
693
}
694
if(not match){
695
/* This interface does not match any in the list, so we don't
696
connect to the server */
697
if(debug){
698
char interface[IF_NAMESIZE];
699
if(if_indextoname((unsigned int)if_index, interface) == NULL){
700
perror_plus("if_indextoname");
701
} else {
702
fprintf_plus(stderr, "Skipping server on non-used interface"
703
" \"%s\"\n",
704
if_indextoname((unsigned int)if_index,
705
interface));
706
}
707
}
708
return -1;
709
}
710
}
711
712
ret = init_gnutls_session(&session, mc);
668
ret = init_gnutls_session(&session);
713
669
if(ret != 0){
714
670
return -1;
715
671
}
716
672
717
673
if(debug){
718
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
719
PRIuMAX "\n", ip, (uintmax_t)port);
674
fprintf(stderr, "Mandos plugin mandos-client: "
675
"Setting up a TCP connection to %s, port %" PRIu16
676
"\n", ip, port);
720
677
}
721
678
722
679
tcp_sd = socket(pf, SOCK_STREAM, 0);
734
691
735
692
memset(&to, 0, sizeof(to));
736
693
if(af == AF_INET6){
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
694
to.in6.sin6_family = (sa_family_t)af;
695
ret = inet_pton(af, ip, &to.in6.sin6_addr);
739
696
} else { /* IPv4 */
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
697
to.in.sin_family = (sa_family_t)af;
698
ret = inet_pton(af, ip, &to.in.sin_addr);
742
699
}
743
700
if(ret < 0 ){
744
701
int e = errno;
748
705
}
749
706
if(ret == 0){
750
707
int e = errno;
751
fprintf_plus(stderr, "Bad address: %s\n", ip);
708
fprintf(stderr, "Mandos plugin mandos-client: "
709
"Bad address: %s\n", ip);
752
710
errno = e;
753
711
goto mandos_end;
754
712
}
755
713
if(af == AF_INET6){
756
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
757
if(IN6_IS_ADDR_LINKLOCAL
758
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
714
to.in6.sin6_port = htons(port); /* Spurious warnings from
715
-Wconversion and
716
-Wunreachable-code */
717
718
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
719
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
720
-Wunreachable-code*/
759
721
if(if_index == AVAHI_IF_UNSPEC){
760
fprintf_plus(stderr, "An IPv6 link-local address is"
761
" incomplete without a network interface\n");
722
fprintf(stderr, "Mandos plugin mandos-client: "
723
"An IPv6 link-local address is incomplete"
724
" without a network interface\n");
762
725
errno = EINVAL;
763
726
goto mandos_end;
764
727
}
765
728
/* Set the network interface number as scope */
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
729
to.in6.sin6_scope_id = (uint32_t)if_index;
767
730
}
768
731
} else {
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
732
to.in.sin_port = htons(port); /* Spurious warnings from
733
-Wconversion and
734
-Wunreachable-code */
770
735
}
771
736
772
737
if(quit_now){
780
745
if(if_indextoname((unsigned int)if_index, interface) == NULL){
781
746
perror_plus("if_indextoname");
782
747
} else {
783
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
784
"\n", ip, interface, (uintmax_t)port);
748
fprintf(stderr, "Mandos plugin mandos-client: "
749
"Connection to: %s%%%s, port %" PRIu16 "\n",
750
ip, interface, port);
785
751
}
786
752
} else {
787
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
788
ip, (uintmax_t)port);
753
fprintf(stderr, "Mandos plugin mandos-client: "
754
"Connection to: %s, port %" PRIu16 "\n", ip, port);
789
755
}
790
756
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
791
757
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
758
const char *pcret;
792
759
if(af == AF_INET6){
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
760
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
761
sizeof(addrstr));
797
762
} else {
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
763
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
764
sizeof(addrstr));
802
765
}
803
if(ret == EAI_SYSTEM){
804
perror_plus("getnameinfo");
805
} else if(ret != 0) {
806
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
807
} else if(strcmp(addrstr, ip) != 0){
808
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
766
if(pcret == NULL){
767
perror_plus("inet_ntop");
768
} else {
769
if(strcmp(addrstr, ip) != 0){
770
fprintf(stderr, "Mandos plugin mandos-client: "
771
"Canonical address form: %s\n", addrstr);
772
}
809
773
}
810
774
}
811
775
815
779
}
816
780
817
781
if(af == AF_INET6){
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
782
ret = connect(tcp_sd, &to.in6, sizeof(to));
820
783
} else {
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
784
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
823
785
}
824
786
if(ret < 0){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
787
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
788
int e = errno;
827
789
perror_plus("connect");
828
790
errno = e;
840
802
while(true){
841
803
size_t out_size = strlen(out);
842
804
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
843
out_size - written));
805
out_size - written));
844
806
if(ret == -1){
845
807
int e = errno;
846
808
perror_plus("write");
866
828
}
867
829
868
830
if(debug){
869
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
831
fprintf(stderr, "Mandos plugin mandos-client: "
832
"Establishing TLS session with %s\n", ip);
870
833
}
871
834
872
835
if(quit_now){
874
837
goto mandos_end;
875
838
}
876
839
877
/* This casting via intptr_t is to eliminate warning about casting
878
an int to a pointer type. This is exactly how the GnuTLS Guile
879
function "set-session-transport-fd!" does it. */
880
gnutls_transport_set_ptr(session,
881
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
840
/* Spurious warning from -Wint-to-pointer-cast */
841
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
882
842
883
843
if(quit_now){
884
844
errno = EINTR;
895
855
896
856
if(ret != GNUTLS_E_SUCCESS){
897
857
if(debug){
898
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
858
fprintf(stderr, "Mandos plugin mandos-client: "
859
"*** GnuTLS Handshake failed ***\n");
899
860
gnutls_perror(ret);
900
861
}
901
862
errno = EPROTO;
905
866
/* Read OpenPGP packet that contains the wanted password */
906
867
907
868
if(debug){
908
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
909
" %s\n", ip);
869
fprintf(stderr, "Mandos plugin mandos-client: "
870
"Retrieving OpenPGP encrypted password from %s\n", ip);
910
871
}
911
872
912
873
while(true){
917
878
}
918
879
919
880
buffer_capacity = incbuffer(&buffer, buffer_length,
920
buffer_capacity);
881
buffer_capacity);
921
882
if(buffer_capacity == 0){
922
883
int e = errno;
923
884
perror_plus("incbuffer");
950
911
}
951
912
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
952
913
if(ret < 0){
953
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
954
"***\n");
914
fprintf(stderr, "Mandos plugin mandos-client: "
915
"*** GnuTLS Re-handshake failed ***\n");
955
916
gnutls_perror(ret);
956
917
errno = EPROTO;
957
918
goto mandos_end;
958
919
}
959
920
break;
960
921
default:
961
fprintf_plus(stderr, "Unknown error while reading data from"
962
" encrypted session with Mandos server\n");
922
fprintf(stderr, "Mandos plugin mandos-client: "
923
"Unknown error while reading data from"
924
" encrypted session with Mandos server\n");
963
925
gnutls_bye(session, GNUTLS_SHUT_RDWR);
964
926
errno = EIO;
965
927
goto mandos_end;
970
932
}
971
933
972
934
if(debug){
973
fprintf_plus(stderr, "Closing TLS session\n");
935
fprintf(stderr, "Mandos plugin mandos-client: "
936
"Closing TLS session\n");
974
937
}
975
938
976
939
if(quit_now){
988
951
989
952
if(buffer_length > 0){
990
953
ssize_t decrypted_buffer_size;
991
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
992
&decrypted_buffer, mc);
954
decrypted_buffer_size = pgp_packet_decrypt(buffer,
955
buffer_length,
956
&decrypted_buffer);
993
957
if(decrypted_buffer_size >= 0){
994
958
995
959
written = 0;
1005
969
if(ret == 0 and ferror(stdout)){
1006
970
int e = errno;
1007
971
if(debug){
1008
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1009
strerror(errno));
972
fprintf(stderr, "Mandos plugin mandos-client: "
973
"Error writing encrypted data: %s\n",
974
strerror(errno));
1010
975
}
1011
976
errno = e;
1012
977
goto mandos_end;
1043
1008
return retval;
1044
1009
}
1045
1010
1046
__attribute__((nonnull))
1047
1011
static void resolve_callback(AvahiSServiceResolver *r,
1048
1012
AvahiIfIndex interface,
1049
1013
AvahiProtocol proto,
1057
1021
AVAHI_GCC_UNUSED AvahiStringList *txt,
1058
1022
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1059
1023
flags,
1060
void *mc){
1061
if(r == NULL){
1062
return;
1063
}
1024
AVAHI_GCC_UNUSED void* userdata){
1025
assert(r);
1064
1026
1065
1027
/* Called whenever a service has been resolved successfully or
1066
1028
timed out */
1072
1034
switch(event){
1073
1035
default:
1074
1036
case AVAHI_RESOLVER_FAILURE:
1075
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1076
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1077
domain,
1078
avahi_strerror(avahi_server_errno
1079
(((mandos_context*)mc)->server)));
1037
fprintf(stderr, "Mandos plugin mandos-client: "
1038
"(Avahi Resolver) Failed to resolve service '%s'"
1039
" of type '%s' in domain '%s': %s\n", name, type, domain,
1040
avahi_strerror(avahi_server_errno(mc.server)));
1080
1041
break;
1081
1042
1082
1043
case AVAHI_RESOLVER_FOUND:
1084
1045
char ip[AVAHI_ADDRESS_STR_MAX];
1085
1046
avahi_address_snprint(ip, sizeof(ip), address);
1086
1047
if(debug){
1087
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1088
PRIdMAX ") on port %" PRIu16 "\n", name,
1089
host_name, ip, (intmax_t)interface, port);
1048
fprintf(stderr, "Mandos plugin mandos-client: "
1049
"Mandos server \"%s\" found on %s (%s, %"
1050
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1051
ip, (intmax_t)interface, port);
1090
1052
}
1091
int ret = start_mandos_communication(ip, (in_port_t)port,
1092
interface,
1093
avahi_proto_to_af(proto),
1094
mc);
1053
int ret = start_mandos_communication(ip, port, interface,
1054
avahi_proto_to_af(proto));
1095
1055
if(ret == 0){
1096
avahi_simple_poll_quit(simple_poll);
1056
avahi_simple_poll_quit(mc.simple_poll);
1097
1057
} else {
1098
if(not add_server(ip, (in_port_t)port, interface,
1099
avahi_proto_to_af(proto),
1100
&((mandos_context*)mc)->current_server)){
1101
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1102
" list\n", name);
1103
}
1058
ret = add_server(ip, port, interface,
1059
avahi_proto_to_af(proto));
1104
1060
}
1105
1061
}
1106
1062
}
1116
1072
const char *domain,
1117
1073
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1118
1074
flags,
1119
void *mc){
1120
if(b == NULL){
1121
return;
1122
}
1075
AVAHI_GCC_UNUSED void* userdata){
1076
assert(b);
1123
1077
1124
1078
/* Called whenever a new services becomes available on the LAN or
1125
1079
is removed from the LAN */
1132
1086
default:
1133
1087
case AVAHI_BROWSER_FAILURE:
1134
1088
1135
fprintf_plus(stderr, "(Avahi browser) %s\n",
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1138
avahi_simple_poll_quit(simple_poll);
1089
fprintf(stderr, "Mandos plugin mandos-client: "
1090
"(Avahi browser) %s\n",
1091
avahi_strerror(avahi_server_errno(mc.server)));
1092
avahi_simple_poll_quit(mc.simple_poll);
1139
1093
return;
1140
1094
1141
1095
case AVAHI_BROWSER_NEW:
1144
1098
the callback function is called the Avahi server will free the
1145
1099
resolver for us. */
1146
1100
1147
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1148
interface, protocol, name, type,
1149
domain, protocol, 0,
1150
resolve_callback, mc) == NULL)
1151
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1152
" %s\n", name,
1153
avahi_strerror(avahi_server_errno
1154
(((mandos_context*)mc)->server)));
1101
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1102
name, type, domain, protocol, 0,
1103
resolve_callback, NULL) == NULL)
1104
fprintf(stderr, "Mandos plugin mandos-client: "
1105
"Avahi: Failed to resolve service '%s': %s\n",
1106
name, avahi_strerror(avahi_server_errno(mc.server)));
1155
1107
break;
1156
1108
1157
1109
case AVAHI_BROWSER_REMOVE:
1160
1112
case AVAHI_BROWSER_ALL_FOR_NOW:
1161
1113
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1162
1114
if(debug){
1163
fprintf_plus(stderr, "No Mandos server found, still"
1164
" searching...\n");
1115
fprintf(stderr, "Mandos plugin mandos-client: "
1116
"No Mandos server found, still searching...\n");
1165
1117
}
1166
1118
break;
1167
1119
}
1176
1128
signal_received = sig;
1177
1129
int old_errno = errno;
1178
1130
/* set main loop to exit */
1179
if(simple_poll != NULL){
1180
avahi_simple_poll_quit(simple_poll);
1131
if(mc.simple_poll != NULL){
1132
avahi_simple_poll_quit(mc.simple_poll);
1181
1133
}
1182
1134
errno = old_errno;
1183
1135
}
1184
1136
1185
__attribute__((nonnull, warn_unused_result))
1186
1137
bool get_flags(const char *ifname, struct ifreq *ifr){
1187
1138
int ret;
1188
error_t ret_errno;
1189
1139
1190
1140
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1191
1141
if(s < 0){
1192
ret_errno = errno;
1193
1142
perror_plus("socket");
1194
errno = ret_errno;
1195
1143
return false;
1196
1144
}
1197
1145
strcpy(ifr->ifr_name, ifname);
1198
1146
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1199
1147
if(ret == -1){
1200
1148
if(debug){
1201
ret_errno = errno;
1202
1149
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1204
1150
}
1205
1151
return false;
1206
1152
}
1207
1153
return true;
1208
1154
}
1209
1155
1210
__attribute__((nonnull, warn_unused_result))
1211
1156
bool good_flags(const char *ifname, const struct ifreq *ifr){
1212
1157
1213
1158
/* Reject the loopback device */
1214
1159
if(ifr->ifr_flags & IFF_LOOPBACK){
1215
1160
if(debug){
1216
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1217
ifname);
1161
fprintf(stderr, "Mandos plugin mandos-client: "
1162
"Rejecting loopback interface \"%s\"\n", ifname);
1218
1163
}
1219
1164
return false;
1220
1165
}
1221
1166
/* Accept point-to-point devices only if connect_to is specified */
1222
1167
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1223
1168
if(debug){
1224
fprintf_plus(stderr, "Accepting point-to-point interface"
1225
" \"%s\"\n", ifname);
1169
fprintf(stderr, "Mandos plugin mandos-client: "
1170
"Accepting point-to-point interface \"%s\"\n", ifname);
1226
1171
}
1227
1172
return true;
1228
1173
}
1229
1174
/* Otherwise, reject non-broadcast-capable devices */
1230
1175
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1231
1176
if(debug){
1232
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1233
" \"%s\"\n", ifname);
1177
fprintf(stderr, "Mandos plugin mandos-client: "
1178
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1234
1179
}
1235
1180
return false;
1236
1181
}
1237
1182
/* Reject non-ARP interfaces (including dummy interfaces) */
1238
1183
if(ifr->ifr_flags & IFF_NOARP){
1239
1184
if(debug){
1240
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1241
ifname);
1185
fprintf(stderr, "Mandos plugin mandos-client: "
1186
"Rejecting non-ARP interface \"%s\"\n", ifname);
1242
1187
}
1243
1188
return false;
1244
1189
}
1245
1190
1246
1191
/* Accept this device */
1247
1192
if(debug){
1248
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1193
fprintf(stderr, "Mandos plugin mandos-client: "
1194
"Interface \"%s\" is good\n", ifname);
1249
1195
}
1250
1196
return true;
1251
1197
}
1255
1201
* corresponds to an acceptable network device.
1256
1202
* (This function is passed to scandir(3) as a filter function.)
1257
1203
*/
1258
__attribute__((nonnull, warn_unused_result))
1259
1204
int good_interface(const struct dirent *if_entry){
1260
1205
if(if_entry->d_name[0] == '.'){
1261
1206
return 0;
1264
1209
struct ifreq ifr;
1265
1210
if(not get_flags(if_entry->d_name, &ifr)){
1266
1211
if(debug){
1267
fprintf_plus(stderr, "Failed to get flags for interface "
1268
"\"%s\"\n", if_entry->d_name);
1269
}
1270
return 0;
1271
}
1272
1273
if(not good_flags(if_entry->d_name, &ifr)){
1274
return 0;
1275
}
1276
return 1;
1277
}
1278
1279
/*
1280
* This function determines if a network interface is up.
1281
*/
1282
__attribute__((nonnull, warn_unused_result))
1283
bool interface_is_up(const char *interface){
1284
struct ifreq ifr;
1285
if(not get_flags(interface, &ifr)){
1286
if(debug){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1289
}
1290
return false;
1291
}
1292
1293
return (bool)(ifr.ifr_flags & IFF_UP);
1294
}
1295
1296
/*
1297
* This function determines if a network interface is running
1298
*/
1299
__attribute__((nonnull, warn_unused_result))
1300
bool interface_is_running(const char *interface){
1301
struct ifreq ifr;
1302
if(not get_flags(interface, &ifr)){
1303
if(debug){
1304
fprintf_plus(stderr, "Failed to get flags for interface "
1305
"\"%s\"\n", interface);
1306
}
1307
return false;
1308
}
1309
1310
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1311
}
1312
1313
__attribute__((nonnull, pure, warn_unused_result))
1212
fprintf(stderr, "Mandos plugin mandos-client: "
1213
"Failed to get flags for interface \"%s\"\n",
1214
if_entry->d_name);
1215
}
1216
return 0;
1217
}
1218
1219
if(not good_flags(if_entry->d_name, &ifr)){
1220
return 0;
1221
}
1222
return 1;
1223
}
1224
1225
/*
1226
* This function determines if a directory entry in /sys/class/net
1227
* corresponds to an acceptable network device which is up.
1228
* (This function is passed to scandir(3) as a filter function.)
1229
*/
1230
int up_interface(const struct dirent *if_entry){
1231
if(if_entry->d_name[0] == '.'){
1232
return 0;
1233
}
1234
1235
struct ifreq ifr;
1236
if(not get_flags(if_entry->d_name, &ifr)){
1237
if(debug){
1238
fprintf(stderr, "Mandos plugin mandos-client: "
1239
"Failed to get flags for interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
/* Reject down interfaces */
1246
if(not (ifr.ifr_flags & IFF_UP)){
1247
if(debug){
1248
fprintf(stderr, "Mandos plugin mandos-client: "
1249
"Rejecting down interface \"%s\"\n",
1250
if_entry->d_name);
1251
}
1252
return 0;
1253
}
1254
1255
/* Reject non-running interfaces */
1256
if(not (ifr.ifr_flags & IFF_RUNNING)){
1257
if(debug){
1258
fprintf(stderr, "Mandos plugin mandos-client: "
1259
"Rejecting non-running interface \"%s\"\n",
1260
if_entry->d_name);
1261
}
1262
return 0;
1263
}
1264
1265
if(not good_flags(if_entry->d_name, &ifr)){
1266
return 0;
1267
}
1268
return 1;
1269
}
1270
1314
1271
int notdotentries(const struct dirent *direntry){
1315
1272
/* Skip "." and ".." */
1316
1273
if(direntry->d_name[0] == '.'
1323
1280
}
1324
1281
1325
1282
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1327
1283
int runnable_hook(const struct dirent *direntry){
1328
1284
int ret;
1329
size_t sret;
1330
1285
struct stat st;
1331
1286
1332
1287
if((direntry->d_name)[0] == '\0'){
1334
1289
return 0;
1335
1290
}
1336
1291
1337
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1338
"abcdefghijklmnopqrstuvwxyz"
1339
"0123456789"
1340
"_.-");
1341
if((direntry->d_name)[sret] != '\0'){
1342
/* Contains non-allowed characters */
1343
if(debug){
1344
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1345
direntry->d_name);
1346
}
1347
return 0;
1348
}
1349
1350
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1292
/* Save pointer to last character */
1293
char *end = strchr(direntry->d_name, '\0')-1;
1294
1295
if(*end == '~'){
1296
/* Backup name~ */
1297
return 0;
1298
}
1299
1300
if(((direntry->d_name)[0] == '#')
1301
and (*end == '#')){
1302
/* Temporary #name# */
1303
return 0;
1304
}
1305
1306
/* XXX more rules here */
1307
1308
char *fullname = NULL;
1309
ret = asprintf(&fullname, "%s/%s", hookdir,
1310
direntry->d_name);
1311
if(ret < 0){
1312
perror_plus("asprintf");
1313
return 0;
1314
}
1315
1316
ret = stat(fullname, &st);
1351
1317
if(ret == -1){
1352
1318
if(debug){
1353
perror_plus("Could not stat hook");
1319
perror_plus("Could not stat plugin");
1354
1320
}
1355
1321
return 0;
1356
1322
}
1357
1323
if(not (S_ISREG(st.st_mode))){
1358
1324
/* Not a regular file */
1359
if(debug){
1360
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1361
direntry->d_name);
1362
}
1363
1325
return 0;
1364
1326
}
1365
1327
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1366
1328
/* Not executable */
1367
if(debug){
1368
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1369
direntry->d_name);
1370
}
1371
1329
return 0;
1372
1330
}
1373
if(debug){
1374
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1375
direntry->d_name);
1376
}
1377
1331
return 1;
1378
1332
}
1379
1333
1380
__attribute__((nonnull, warn_unused_result))
1381
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1382
mandos_context *mc){
1334
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1383
1335
int ret;
1384
1336
struct timespec now;
1385
1337
struct timespec waited_time;
1386
1338
intmax_t block_time;
1387
1339
1388
1340
while(true){
1389
if(mc->current_server == NULL){
1390
if(debug){
1391
fprintf_plus(stderr, "Wait until first server is found."
1392
" No timeout!\n");
1341
if(mc.current_server == NULL){
1342
if (debug){
1343
fprintf(stderr, "Mandos plugin mandos-client: "
1344
"Wait until first server is found. No timeout!\n");
1393
1345
}
1394
1346
ret = avahi_simple_poll_iterate(s, -1);
1395
1347
} else {
1396
if(debug){
1397
fprintf_plus(stderr, "Check current_server if we should run"
1398
" it, or wait\n");
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Check current_server if we should run it,"
1351
" or wait\n");
1399
1352
}
1400
1353
/* the current time */
1401
1354
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1406
1359
/* Calculating in ms how long time between now and server
1407
1360
who we visted longest time ago. Now - last seen. */
1408
1361
waited_time.tv_sec = (now.tv_sec
1409
- mc->current_server->last_seen.tv_sec);
1362
- mc.current_server->last_seen.tv_sec);
1410
1363
waited_time.tv_nsec = (now.tv_nsec
1411
- mc->current_server->last_seen.tv_nsec);
1364
- mc.current_server->last_seen.tv_nsec);
1412
1365
/* total time is 10s/10,000ms.
1413
1366
Converting to s from ms by dividing by 1,000,
1414
1367
and ns to ms by dividing by 1,000,000. */
1416
1369
- ((intmax_t)waited_time.tv_sec * 1000))
1417
1370
- ((intmax_t)waited_time.tv_nsec / 1000000));
1418
1371
1419
if(debug){
1420
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1421
block_time);
1372
if (debug){
1373
fprintf(stderr, "Mandos plugin mandos-client: "
1374
"Blocking for %" PRIdMAX " ms\n", block_time);
1422
1375
}
1423
1376
1424
1377
if(block_time <= 0){
1425
ret = start_mandos_communication(mc->current_server->ip,
1426
mc->current_server->port,
1427
mc->current_server->if_index,
1428
mc->current_server->af, mc);
1378
ret = start_mandos_communication(mc.current_server->ip,
1379
mc.current_server->port,
1380
mc.current_server->if_index,
1381
mc.current_server->af);
1429
1382
if(ret == 0){
1430
avahi_simple_poll_quit(s);
1383
avahi_simple_poll_quit(mc.simple_poll);
1431
1384
return 0;
1432
1385
}
1433
1386
ret = clock_gettime(CLOCK_MONOTONIC,
1434
&mc->current_server->last_seen);
1387
&mc.current_server->last_seen);
1435
1388
if(ret == -1){
1436
1389
perror_plus("clock_gettime");
1437
1390
return -1;
1438
1391
}
1439
mc->current_server = mc->current_server->next;
1392
mc.current_server = mc.current_server->next;
1440
1393
block_time = 0; /* Call avahi to find new Mandos
1441
1394
servers, but don't block */
1442
1395
}
1444
1397
ret = avahi_simple_poll_iterate(s, (int)block_time);
1445
1398
}
1446
1399
if(ret != 0){
1447
if(ret > 0 or errno != EINTR){
1400
if (ret > 0 or errno != EINTR){
1448
1401
return (ret != 1) ? ret : 0;
1449
1402
}
1450
1403
}
1451
1404
}
1452
1405
}
1453
1406
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective and real user ID to 0. Return errno. */
1468
__attribute__((warn_unused_result))
1469
error_t raise_privileges_permanently(void){
1470
error_t old_errno = errno;
1471
error_t ret_errno = raise_privileges();
1472
if(ret_errno != 0){
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
if(setuid(0) == -1){
1477
ret_errno = errno;
1478
perror_plus("seteuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
/* Set effective user ID to unprivileged saved user ID */
1485
__attribute__((warn_unused_result))
1486
error_t lower_privileges(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(seteuid(uid) == -1){
1490
ret_errno = errno;
1491
perror_plus("seteuid");
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1503
ret_errno = errno;
1504
perror_plus("setuid");
1505
}
1506
errno = old_errno;
1507
return ret_errno;
1508
}
1509
1510
__attribute__((nonnull))
1511
void run_network_hooks(const char *mode, const char *interface,
1512
const float delay){
1513
struct dirent **direntries = NULL;
1514
if(hookdir_fd == -1){
1515
hookdir_fd = open(hookdir, O_RDONLY);
1516
if(hookdir_fd == -1){
1517
if(errno == ENOENT){
1518
if(debug){
1519
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1520
" found\n", hookdir);
1521
}
1522
} else {
1523
perror_plus("open");
1524
}
1525
return;
1526
}
1527
}
1528
#ifdef __GLIBC__
1529
#if __GLIBC_PREREQ(2, 15)
1530
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1531
runnable_hook, alphasort);
1532
#else /* not __GLIBC_PREREQ(2, 15) */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC_PREREQ(2, 15) */
1536
#else /* not __GLIBC__ */
1537
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1538
alphasort);
1539
#endif /* not __GLIBC__ */
1540
if(numhooks == -1){
1541
perror_plus("scandir");
1542
return;
1543
}
1544
struct dirent *direntry;
1545
int ret;
1546
int devnull = open("/dev/null", O_RDONLY);
1547
for(int i = 0; i < numhooks; i++){
1548
direntry = direntries[i];
1549
if(debug){
1550
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1551
direntry->d_name);
1552
}
1553
pid_t hook_pid = fork();
1554
if(hook_pid == 0){
1555
/* Child */
1556
/* Raise privileges */
1557
if(raise_privileges_permanently() != 0){
1558
perror_plus("Failed to raise privileges");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Set group */
1562
errno = 0;
1563
ret = setgid(0);
1564
if(ret == -1){
1565
perror_plus("setgid");
1566
_exit(EX_NOPERM);
1567
}
1568
/* Reset supplementary groups */
1569
errno = 0;
1570
ret = setgroups(0, NULL);
1571
if(ret == -1){
1572
perror_plus("setgroups");
1573
_exit(EX_NOPERM);
1574
}
1575
ret = dup2(devnull, STDIN_FILENO);
1576
if(ret == -1){
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1578
_exit(EX_OSERR);
1579
}
1580
ret = close(devnull);
1581
if(ret == -1){
1582
perror_plus("close");
1583
_exit(EX_OSERR);
1584
}
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1586
if(ret == -1){
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1588
_exit(EX_OSERR);
1589
}
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1591
if(ret == -1){
1592
perror_plus("setenv");
1593
_exit(EX_OSERR);
1594
}
1595
ret = setenv("DEVICE", interface, 1);
1596
if(ret == -1){
1597
perror_plus("setenv");
1598
_exit(EX_OSERR);
1599
}
1600
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1601
if(ret == -1){
1602
perror_plus("setenv");
1603
_exit(EX_OSERR);
1604
}
1605
ret = setenv("MODE", mode, 1);
1606
if(ret == -1){
1607
perror_plus("setenv");
1608
_exit(EX_OSERR);
1609
}
1610
char *delaystring;
1611
ret = asprintf(&delaystring, "%f", (double)delay);
1612
if(ret == -1){
1613
perror_plus("asprintf");
1614
_exit(EX_OSERR);
1615
}
1616
ret = setenv("DELAY", delaystring, 1);
1617
if(ret == -1){
1618
free(delaystring);
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
free(delaystring);
1623
if(connect_to != NULL){
1624
ret = setenv("CONNECT", connect_to, 1);
1625
if(ret == -1){
1626
perror_plus("setenv");
1627
_exit(EX_OSERR);
1628
}
1629
}
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1631
if(hook_fd == -1){
1632
perror_plus("openat");
1633
_exit(EXIT_FAILURE);
1634
}
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1636
perror_plus("close");
1637
_exit(EXIT_FAILURE);
1638
}
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1640
environ) == -1){
1641
perror_plus("fexecve");
1642
_exit(EXIT_FAILURE);
1643
}
1644
} else {
1645
int status;
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
perror_plus("waitpid");
1648
continue;
1649
}
1650
if(WIFEXITED(status)){
1651
if(WEXITSTATUS(status) != 0){
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
" with status %d\n", direntry->d_name,
1654
WEXITSTATUS(status));
1655
continue;
1656
}
1657
} else if(WIFSIGNALED(status)){
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
" signal %d\n", direntry->d_name,
1660
WTERMSIG(status));
1661
continue;
1662
} else {
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
" crashed\n", direntry->d_name);
1665
continue;
1666
}
1667
}
1668
if(debug){
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1670
direntry->d_name);
1671
}
1672
}
1673
free(direntries);
1674
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1675
perror_plus("close");
1676
} else {
1677
hookdir_fd = -1;
1678
}
1679
close(devnull);
1680
}
1681
1682
__attribute__((nonnull, warn_unused_result))
1683
error_t bring_up_interface(const char *const interface,
1684
const float delay){
1685
error_t old_errno = errno;
1686
int ret;
1687
struct ifreq network;
1688
unsigned int if_index = if_nametoindex(interface);
1689
if(if_index == 0){
1690
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1691
errno = old_errno;
1692
return ENXIO;
1693
}
1694
1695
if(quit_now){
1696
errno = old_errno;
1697
return EINTR;
1698
}
1699
1700
if(not interface_is_up(interface)){
1701
error_t ret_errno = 0, ioctl_errno = 0;
1702
if(not get_flags(interface, &network)){
1703
ret_errno = errno;
1704
fprintf_plus(stderr, "Failed to get flags for interface "
1705
"\"%s\"\n", interface);
1706
errno = old_errno;
1707
return ret_errno;
1708
}
1709
network.ifr_flags |= IFF_UP; /* set flag */
1710
1711
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1712
if(sd == -1){
1713
ret_errno = errno;
1714
perror_plus("socket");
1715
errno = old_errno;
1716
return ret_errno;
1717
}
1718
1719
if(quit_now){
1720
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1721
if(ret == -1){
1722
perror_plus("close");
1723
}
1724
errno = old_errno;
1725
return EINTR;
1726
}
1727
1728
if(debug){
1729
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1730
interface);
1731
}
1732
1733
/* Raise privileges */
1734
ret_errno = raise_privileges();
1735
if(ret_errno != 0){
1736
perror_plus("Failed to raise privileges");
1737
}
1738
1739
#ifdef __linux__
1740
int ret_linux;
1741
bool restore_loglevel = false;
1742
if(ret_errno == 0){
1743
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1744
messages about the network interface to mess up the prompt */
1745
ret_linux = klogctl(8, NULL, 5);
1746
if(ret_linux == -1){
1747
perror_plus("klogctl");
1748
} else {
1749
restore_loglevel = true;
1750
}
1751
}
1752
#endif /* __linux__ */
1753
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1754
ioctl_errno = errno;
1755
#ifdef __linux__
1756
if(restore_loglevel){
1757
ret_linux = klogctl(7, NULL, 0);
1758
if(ret_linux == -1){
1759
perror_plus("klogctl");
1760
}
1761
}
1762
#endif /* __linux__ */
1763
1764
/* If raise_privileges() succeeded above */
1765
if(ret_errno == 0){
1766
/* Lower privileges */
1767
ret_errno = lower_privileges();
1768
if(ret_errno != 0){
1769
errno = ret_errno;
1770
perror_plus("Failed to lower privileges");
1771
}
1772
}
1773
1774
/* Close the socket */
1775
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1776
if(ret == -1){
1777
perror_plus("close");
1778
}
1779
1780
if(ret_setflags == -1){
1781
errno = ioctl_errno;
1782
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1783
errno = old_errno;
1784
return ioctl_errno;
1785
}
1786
} else if(debug){
1787
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1788
interface);
1789
}
1790
1791
/* Sleep checking until interface is running.
1792
Check every 0.25s, up to total time of delay */
1793
for(int i=0; i < delay * 4; i++){
1794
if(interface_is_running(interface)){
1795
break;
1796
}
1797
struct timespec sleeptime = { .tv_nsec = 250000000 };
1798
ret = nanosleep(&sleeptime, NULL);
1799
if(ret == -1 and errno != EINTR){
1800
perror_plus("nanosleep");
1801
}
1802
}
1803
1804
errno = old_errno;
1805
return 0;
1806
}
1807
1808
__attribute__((nonnull, warn_unused_result))
1809
error_t take_down_interface(const char *const interface){
1810
error_t old_errno = errno;
1811
struct ifreq network;
1812
unsigned int if_index = if_nametoindex(interface);
1813
if(if_index == 0){
1814
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1815
errno = old_errno;
1816
return ENXIO;
1817
}
1818
if(interface_is_up(interface)){
1819
error_t ret_errno = 0, ioctl_errno = 0;
1820
if(not get_flags(interface, &network) and debug){
1821
ret_errno = errno;
1822
fprintf_plus(stderr, "Failed to get flags for interface "
1823
"\"%s\"\n", interface);
1824
errno = old_errno;
1825
return ret_errno;
1826
}
1827
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1828
1829
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1830
if(sd == -1){
1831
ret_errno = errno;
1832
perror_plus("socket");
1833
errno = old_errno;
1834
return ret_errno;
1835
}
1836
1837
if(debug){
1838
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1839
interface);
1840
}
1841
1842
/* Raise privileges */
1843
ret_errno = raise_privileges();
1844
if(ret_errno != 0){
1845
perror_plus("Failed to raise privileges");
1846
}
1847
1848
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1849
ioctl_errno = errno;
1850
1851
/* If raise_privileges() succeeded above */
1852
if(ret_errno == 0){
1853
/* Lower privileges */
1854
ret_errno = lower_privileges();
1855
if(ret_errno != 0){
1856
errno = ret_errno;
1857
perror_plus("Failed to lower privileges");
1858
}
1859
}
1860
1861
/* Close the socket */
1862
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1863
if(ret == -1){
1864
perror_plus("close");
1865
}
1866
1867
if(ret_setflags == -1){
1868
errno = ioctl_errno;
1869
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1870
errno = old_errno;
1871
return ioctl_errno;
1872
}
1873
} else if(debug){
1874
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1875
interface);
1876
}
1877
1878
errno = old_errno;
1879
return 0;
1880
}
1881
1882
1407
int main(int argc, char *argv[]){
1883
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1884
.priority = "SECURE256:!CTYPE-X.509:"
1885
"+CTYPE-OPENPGP", .current_server = NULL,
1886
.interfaces = NULL, .interfaces_size = 0 };
1887
1408
AvahiSServiceBrowser *sb = NULL;
1888
error_t ret_errno;
1409
int error;
1889
1410
int ret;
1890
1411
intmax_t tmpmax;
1891
1412
char *tmp;
1892
1413
int exitcode = EXIT_SUCCESS;
1893
char *interfaces_to_take_down = NULL;
1894
size_t interfaces_to_take_down_size = 0;
1895
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1896
char old_tempdir[] = "/tmp/mandosXXXXXX";
1897
char *tempdir = NULL;
1414
const char *interface = "";
1415
struct ifreq network;
1416
int sd = -1;
1417
bool take_down_interface = false;
1418
uid_t uid;
1419
gid_t gid;
1420
char tempdir[] = "/tmp/mandosXXXXXX";
1421
bool tempdir_created = false;
1898
1422
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1899
1423
const char *seckey = PATHDIR "/" SECKEY;
1900
1424
const char *pubkey = PATHDIR "/" PUBKEY;
1901
char *interfaces_hooks = NULL;
1902
1425
1903
1426
bool gnutls_initialized = false;
1904
1427
bool gpgme_initialized = false;
1966
1489
.group = 2 },
1967
1490
{ .name = "retry", .key = 132,
1968
1491
.arg = "SECONDS",
1969
.doc = "Retry interval used when denied by the Mandos server",
1492
.doc = "Retry interval used when denied by the mandos server",
1970
1493
.group = 2 },
1971
1494
{ .name = "network-hook-dir", .key = 133,
1972
1495
.arg = "DIR",
1995
1518
connect_to = arg;
1996
1519
break;
1997
1520
case 'i': /* --interface */
1998
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1999
arg, (int)',');
2000
if(ret_errno != 0){
2001
argp_error(state, "%s", strerror(ret_errno));
2002
}
1521
interface = arg;
2003
1522
break;
2004
1523
case 's': /* --seckey */
2005
1524
seckey = arg;
2048
1567
argp_state_help(state, state->out_stream,
2049
1568
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2050
1569
case 'V': /* --version */
2051
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1570
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1571
fprintf(state->out_stream, "%s\n", argp_program_version);
2052
1572
exit(argp_err_exit_status);
2053
1573
break;
2054
1574
default:
2081
1601
{
2082
1602
/* Work around Debian bug #633582:
2083
1603
<http://bugs.debian.org/633582> */
2084
2085
/* Re-raise privileges */
2086
ret_errno = raise_privileges();
2087
if(ret_errno != 0){
2088
errno = ret_errno;
2089
perror_plus("Failed to raise privileges");
1604
struct stat st;
1605
1606
/* Re-raise priviliges */
1607
errno = 0;
1608
ret = seteuid(0);
1609
if(ret == -1){
1610
perror_plus("seteuid");
1611
}
1612
1613
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1614
int seckey_fd = open(seckey, O_RDONLY);
1615
if(seckey_fd == -1){
1616
perror_plus("open");
1617
} else {
1618
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1619
if(ret == -1){
1620
perror_plus("fstat");
1621
} else {
1622
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1623
ret = fchown(seckey_fd, uid, gid);
1624
if(ret == -1){
1625
perror_plus("fchown");
1626
}
1627
}
1628
}
1629
TEMP_FAILURE_RETRY(close(seckey_fd));
1630
}
1631
}
1632
1633
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1634
int pubkey_fd = open(pubkey, O_RDONLY);
1635
if(pubkey_fd == -1){
1636
perror_plus("open");
1637
} else {
1638
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1639
if(ret == -1){
1640
perror_plus("fstat");
1641
} else {
1642
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1643
ret = fchown(pubkey_fd, uid, gid);
1644
if(ret == -1){
1645
perror_plus("fchown");
1646
}
1647
}
1648
}
1649
TEMP_FAILURE_RETRY(close(pubkey_fd));
1650
}
1651
}
1652
1653
/* Lower privileges */
1654
errno = 0;
1655
ret = seteuid(uid);
1656
if(ret == -1){
1657
perror_plus("seteuid");
1658
}
1659
}
1660
1661
/* Find network hooks and run them */
1662
{
1663
struct dirent **direntries;
1664
struct dirent *direntry;
1665
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1666
alphasort);
1667
if(numhooks == -1){
1668
perror_plus("scandir");
2090
1669
} else {
2091
struct stat st;
2092
2093
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2094
int seckey_fd = open(seckey, O_RDONLY);
2095
if(seckey_fd == -1){
2096
perror_plus("open");
2097
} else {
2098
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2099
if(ret == -1){
2100
perror_plus("fstat");
2101
} else {
2102
if(S_ISREG(st.st_mode)
2103
and st.st_uid == 0 and st.st_gid == 0){
2104
ret = fchown(seckey_fd, uid, gid);
2105
if(ret == -1){
2106
perror_plus("fchown");
2107
}
2108
}
2109
}
2110
TEMP_FAILURE_RETRY(close(seckey_fd));
2111
}
2112
}
2113
2114
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2115
int pubkey_fd = open(pubkey, O_RDONLY);
2116
if(pubkey_fd == -1){
2117
perror_plus("open");
2118
} else {
2119
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2120
if(ret == -1){
2121
perror_plus("fstat");
2122
} else {
2123
if(S_ISREG(st.st_mode)
2124
and st.st_uid == 0 and st.st_gid == 0){
2125
ret = fchown(pubkey_fd, uid, gid);
2126
if(ret == -1){
2127
perror_plus("fchown");
2128
}
2129
}
2130
}
2131
TEMP_FAILURE_RETRY(close(pubkey_fd));
2132
}
2133
}
2134
2135
/* Lower privileges */
2136
ret_errno = lower_privileges();
2137
if(ret_errno != 0){
2138
errno = ret_errno;
2139
perror_plus("Failed to lower privileges");
2140
}
2141
}
2142
}
2143
2144
/* Remove invalid interface names (except "none") */
2145
{
2146
char *interface = NULL;
2147
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2148
interface))){
2149
if(strcmp(interface, "none") != 0
2150
and if_nametoindex(interface) == 0){
2151
if(interface[0] != '\0'){
2152
fprintf_plus(stderr, "Not using nonexisting interface"
2153
" \"%s\"\n", interface);
2154
}
2155
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2156
interface = NULL;
2157
}
2158
}
2159
}
2160
2161
/* Run network hooks */
2162
{
2163
if(mc.interfaces != NULL){
2164
interfaces_hooks = malloc(mc.interfaces_size);
2165
if(interfaces_hooks == NULL){
2166
perror_plus("malloc");
2167
goto end;
2168
}
2169
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2170
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2171
}
2172
run_network_hooks("start", interfaces_hooks != NULL ?
2173
interfaces_hooks : "", delay);
1670
int devnull = open("/dev/null", O_RDONLY);
1671
for(int i = 0; i < numhooks; i++){
1672
direntry = direntries[0];
1673
char *fullname = NULL;
1674
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1675
if(ret < 0){
1676
perror_plus("asprintf");
1677
continue;
1678
}
1679
pid_t hook_pid = fork();
1680
if(hook_pid == 0){
1681
/* Child */
1682
dup2(devnull, STDIN_FILENO);
1683
close(devnull);
1684
dup2(STDERR_FILENO, STDOUT_FILENO);
1685
ret = setenv("DEVICE", interface, 1);
1686
if(ret == -1){
1687
perror_plus("setenv");
1688
exit(1);
1689
}
1690
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1691
if(ret == -1){
1692
perror_plus("setenv");
1693
exit(1);
1694
}
1695
ret = setenv("MODE", "start", 1);
1696
if(ret == -1){
1697
perror_plus("setenv");
1698
exit(1);
1699
}
1700
char *delaystring;
1701
ret = asprintf(&delaystring, "%f", delay);
1702
if(ret == -1){
1703
perror_plus("asprintf");
1704
exit(1);
1705
}
1706
ret = setenv("DELAY", delaystring, 1);
1707
if(ret == -1){
1708
free(delaystring);
1709
perror_plus("setenv");
1710
exit(1);
1711
}
1712
free(delaystring);
1713
ret = execl(fullname, direntry->d_name, "start", NULL);
1714
perror_plus("execl");
1715
} else {
1716
int status;
1717
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1718
perror_plus("waitpid");
1719
free(fullname);
1720
continue;
1721
}
1722
if(WIFEXITED(status)){
1723
if(WEXITSTATUS(status) != 0){
1724
fprintf(stderr, "Mandos plugin mandos-client: "
1725
"Warning: network hook \"%s\" exited"
1726
" with status %d\n", direntry->d_name,
1727
WEXITSTATUS(status));
1728
free(fullname);
1729
continue;
1730
}
1731
} else if(WIFSIGNALED(status)){
1732
fprintf(stderr, "Mandos plugin mandos-client: "
1733
"Warning: network hook \"%s\" died by"
1734
" signal %d\n", direntry->d_name,
1735
WTERMSIG(status));
1736
free(fullname);
1737
continue;
1738
} else {
1739
fprintf(stderr, "Mandos plugin mandos-client: "
1740
"Warning: network hook \"%s\" crashed\n",
1741
direntry->d_name);
1742
free(fullname);
1743
continue;
1744
}
1745
}
1746
free(fullname);
1747
if(quit_now){
1748
goto end;
1749
}
1750
}
1751
close(devnull);
1752
}
2174
1753
}
2175
1754
2176
1755
if(not debug){
2177
1756
avahi_set_log_function(empty_log);
2178
1757
}
2179
1758
1759
if(interface[0] == '\0'){
1760
struct dirent **direntries;
1761
/* First look for interfaces that are up */
1762
ret = scandir(sys_class_net, &direntries, up_interface,
1763
alphasort);
1764
if(ret == 0){
1765
/* No up interfaces, look for any good interfaces */
1766
free(direntries);
1767
ret = scandir(sys_class_net, &direntries, good_interface,
1768
alphasort);
1769
}
1770
if(ret >= 1){
1771
/* Pick the first interface returned */
1772
interface = strdup(direntries[0]->d_name);
1773
if(debug){
1774
fprintf(stderr, "Mandos plugin mandos-client: "
1775
"Using interface \"%s\"\n", interface);
1776
}
1777
if(interface == NULL){
1778
perror_plus("malloc");
1779
free(direntries);
1780
exitcode = EXIT_FAILURE;
1781
goto end;
1782
}
1783
free(direntries);
1784
} else {
1785
free(direntries);
1786
fprintf(stderr, "Mandos plugin mandos-client: "
1787
"Could not find a network interface\n");
1788
exitcode = EXIT_FAILURE;
1789
goto end;
1790
}
1791
}
1792
2180
1793
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2181
1794
from the signal handler */
2182
1795
/* Initialize the pseudo-RNG for Avahi */
2183
1796
srand((unsigned int) time(NULL));
2184
simple_poll = avahi_simple_poll_new();
2185
if(simple_poll == NULL){
2186
fprintf_plus(stderr,
2187
"Avahi: Failed to create simple poll object.\n");
1797
mc.simple_poll = avahi_simple_poll_new();
1798
if(mc.simple_poll == NULL){
1799
fprintf(stderr, "Mandos plugin mandos-client: "
1800
"Avahi: Failed to create simple poll object.\n");
2188
1801
exitcode = EX_UNAVAILABLE;
2189
1802
goto end;
2190
1803
}
2252
1865
}
2253
1866
}
2254
1867
2255
/* If no interfaces were specified, make a list */
2256
if(mc.interfaces == NULL){
2257
struct dirent **direntries = NULL;
2258
/* Look for any good interfaces */
2259
ret = scandir(sys_class_net, &direntries, good_interface,
2260
alphasort);
2261
if(ret >= 1){
2262
/* Add all found interfaces to interfaces list */
2263
for(int i = 0; i < ret; ++i){
2264
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2265
direntries[i]->d_name);
2266
if(ret_errno != 0){
2267
errno = ret_errno;
2268
perror_plus("argz_add");
2269
continue;
2270
}
2271
if(debug){
2272
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2273
direntries[i]->d_name);
2274
}
2275
}
2276
free(direntries);
1868
/* If the interface is down, bring it up */
1869
if(strcmp(interface, "none") != 0){
1870
if_index = (AvahiIfIndex) if_nametoindex(interface);
1871
if(if_index == 0){
1872
fprintf(stderr, "Mandos plugin mandos-client: "
1873
"No such interface: \"%s\"\n", interface);
1874
exitcode = EX_UNAVAILABLE;
1875
goto end;
1876
}
1877
1878
if(quit_now){
1879
goto end;
1880
}
1881
1882
/* Re-raise priviliges */
1883
errno = 0;
1884
ret = seteuid(0);
1885
if(ret == -1){
1886
perror_plus("seteuid");
1887
}
1888
1889
#ifdef __linux__
1890
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1891
messages about the network interface to mess up the prompt */
1892
ret = klogctl(8, NULL, 5);
1893
bool restore_loglevel = true;
1894
if(ret == -1){
1895
restore_loglevel = false;
1896
perror_plus("klogctl");
1897
}
1898
#endif /* __linux__ */
1899
1900
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1901
if(sd < 0){
1902
perror_plus("socket");
1903
exitcode = EX_OSERR;
1904
#ifdef __linux__
1905
if(restore_loglevel){
1906
ret = klogctl(7, NULL, 0);
1907
if(ret == -1){
1908
perror_plus("klogctl");
1909
}
1910
}
1911
#endif /* __linux__ */
1912
/* Lower privileges */
1913
errno = 0;
1914
ret = seteuid(uid);
1915
if(ret == -1){
1916
perror_plus("seteuid");
1917
}
1918
goto end;
1919
}
1920
strcpy(network.ifr_name, interface);
1921
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1922
if(ret == -1){
1923
perror_plus("ioctl SIOCGIFFLAGS");
1924
#ifdef __linux__
1925
if(restore_loglevel){
1926
ret = klogctl(7, NULL, 0);
1927
if(ret == -1){
1928
perror_plus("klogctl");
1929
}
1930
}
1931
#endif /* __linux__ */
1932
exitcode = EX_OSERR;
1933
/* Lower privileges */
1934
errno = 0;
1935
ret = seteuid(uid);
1936
if(ret == -1){
1937
perror_plus("seteuid");
1938
}
1939
goto end;
1940
}
1941
if((network.ifr_flags & IFF_UP) == 0){
1942
network.ifr_flags |= IFF_UP;
1943
take_down_interface = true;
1944
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1945
if(ret == -1){
1946
take_down_interface = false;
1947
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1948
exitcode = EX_OSERR;
1949
#ifdef __linux__
1950
if(restore_loglevel){
1951
ret = klogctl(7, NULL, 0);
1952
if(ret == -1){
1953
perror_plus("klogctl");
1954
}
1955
}
1956
#endif /* __linux__ */
1957
/* Lower privileges */
1958
errno = 0;
1959
ret = seteuid(uid);
1960
if(ret == -1){
1961
perror_plus("seteuid");
1962
}
1963
goto end;
1964
}
1965
}
1966
/* Sleep checking until interface is running.
1967
Check every 0.25s, up to total time of delay */
1968
for(int i=0; i < delay * 4; i++){
1969
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1970
if(ret == -1){
1971
perror_plus("ioctl SIOCGIFFLAGS");
1972
} else if(network.ifr_flags & IFF_RUNNING){
1973
break;
1974
}
1975
struct timespec sleeptime = { .tv_nsec = 250000000 };
1976
ret = nanosleep(&sleeptime, NULL);
1977
if(ret == -1 and errno != EINTR){
1978
perror_plus("nanosleep");
1979
}
1980
}
1981
if(not take_down_interface){
1982
/* We won't need the socket anymore */
1983
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1984
if(ret == -1){
1985
perror_plus("close");
1986
}
1987
}
1988
#ifdef __linux__
1989
if(restore_loglevel){
1990
/* Restores kernel loglevel to default */
1991
ret = klogctl(7, NULL, 0);
1992
if(ret == -1){
1993
perror_plus("klogctl");
1994
}
1995
}
1996
#endif /* __linux__ */
1997
/* Lower privileges */
1998
errno = 0;
1999
if(take_down_interface){
2000
/* Lower privileges */
2001
ret = seteuid(uid);
2002
if(ret == -1){
2003
perror_plus("seteuid");
2004
}
2277
2005
} else {
2278
if(ret == 0){
2279
free(direntries);
2280
}
2281
fprintf_plus(stderr, "Could not find a network interface\n");
2282
exitcode = EXIT_FAILURE;
2283
goto end;
2284
}
2285
}
2286
2287
/* Bring up interfaces which are down, and remove any "none"s */
2288
{
2289
char *interface = NULL;
2290
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2291
interface))){
2292
/* If interface name is "none", stop bringing up interfaces.
2293
Also remove all instances of "none" from the list */
2294
if(strcmp(interface, "none") == 0){
2295
argz_delete(&mc.interfaces, &mc.interfaces_size,
2296
interface);
2297
interface = NULL;
2298
while((interface = argz_next(mc.interfaces,
2299
mc.interfaces_size, interface))){
2300
if(strcmp(interface, "none") == 0){
2301
argz_delete(&mc.interfaces, &mc.interfaces_size,
2302
interface);
2303
interface = NULL;
2304
}
2305
}
2306
break;
2307
}
2308
bool interface_was_up = interface_is_up(interface);
2309
errno = bring_up_interface(interface, delay);
2310
if(not interface_was_up){
2311
if(errno != 0){
2312
perror_plus("Failed to bring up interface");
2313
} else {
2314
errno = argz_add(&interfaces_to_take_down,
2315
&interfaces_to_take_down_size,
2316
interface);
2317
if(errno != 0){
2318
perror_plus("argz_add");
2319
}
2320
}
2321
}
2322
}
2323
if(debug and (interfaces_to_take_down == NULL)){
2324
fprintf_plus(stderr, "No interfaces were brought up\n");
2325
}
2326
}
2327
2328
/* If we only got one interface, explicitly use only that one */
2329
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2330
if(debug){
2331
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2332
mc.interfaces);
2333
}
2334
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2006
/* Lower privileges permanently */
2007
ret = setuid(uid);
2008
if(ret == -1){
2009
perror_plus("setuid");
2010
}
2011
}
2335
2012
}
2336
2013
2337
2014
if(quit_now){
2338
2015
goto end;
2339
2016
}
2340
2017
2341
ret = init_gnutls_global(pubkey, seckey, &mc);
2018
ret = init_gnutls_global(pubkey, seckey);
2342
2019
if(ret == -1){
2343
fprintf_plus(stderr, "init_gnutls_global failed\n");
2020
fprintf(stderr, "Mandos plugin mandos-client: "
2021
"init_gnutls_global failed\n");
2344
2022
exitcode = EX_UNAVAILABLE;
2345
2023
goto end;
2346
2024
} else {
2351
2029
goto end;
2352
2030
}
2353
2031
2354
/* Try /run/tmp before /tmp */
2355
tempdir = mkdtemp(run_tempdir);
2356
if(tempdir == NULL and errno == ENOENT){
2357
if(debug){
2358
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2359
run_tempdir, old_tempdir);
2360
}
2361
tempdir = mkdtemp(old_tempdir);
2362
}
2363
if(tempdir == NULL){
2032
if(mkdtemp(tempdir) == NULL){
2364
2033
perror_plus("mkdtemp");
2365
2034
goto end;
2366
2035
}
2036
tempdir_created = true;
2367
2037
2368
2038
if(quit_now){
2369
2039
goto end;
2370
2040
}
2371
2041
2372
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2373
fprintf_plus(stderr, "init_gpgme failed\n");
2042
if(not init_gpgme(pubkey, seckey, tempdir)){
2043
fprintf(stderr, "Mandos plugin mandos-client: "
2044
"init_gpgme failed\n");
2374
2045
exitcode = EX_UNAVAILABLE;
2375
2046
goto end;
2376
2047
} else {
2385
2056
/* Connect directly, do not use Zeroconf */
2386
2057
/* (Mainly meant for debugging) */
2387
2058
char *address = strrchr(connect_to, ':');
2388
2389
2059
if(address == NULL){
2390
fprintf_plus(stderr, "No colon in address\n");
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"No colon in address\n");
2391
2062
exitcode = EX_USAGE;
2392
2063
goto end;
2393
2064
}
2396
2067
goto end;
2397
2068
}
2398
2069
2399
in_port_t port;
2070
uint16_t port;
2400
2071
errno = 0;
2401
2072
tmpmax = strtoimax(address+1, &tmp, 10);
2402
2073
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2403
or tmpmax != (in_port_t)tmpmax){
2404
fprintf_plus(stderr, "Bad port number\n");
2074
or tmpmax != (uint16_t)tmpmax){
2075
fprintf(stderr, "Mandos plugin mandos-client: "
2076
"Bad port number\n");
2405
2077
exitcode = EX_USAGE;
2406
2078
goto end;
2407
2079
}
2408
2080
2409
2081
if(quit_now){
2410
2082
goto end;
2411
2083
}
2412
2084
2413
port = (in_port_t)tmpmax;
2085
port = (uint16_t)tmpmax;
2414
2086
*address = '\0';
2415
2087
/* Colon in address indicates IPv6 */
2416
2088
int af;
2432
2104
}
2433
2105
2434
2106
while(not quit_now){
2435
ret = start_mandos_communication(address, port, if_index, af,
2436
&mc);
2107
ret = start_mandos_communication(address, port, if_index, af);
2437
2108
if(quit_now or ret == 0){
2438
2109
break;
2439
2110
}
2440
2111
if(debug){
2441
fprintf_plus(stderr, "Retrying in %d seconds\n",
2442
(int)retry_interval);
2112
fprintf(stderr, "Mandos plugin mandos-client: "
2113
"Retrying in %d seconds\n", (int)retry_interval);
2443
2114
}
2444
sleep((unsigned int)retry_interval);
2115
sleep((int)retry_interval);
2445
2116
}
2446
2117
2447
if(not quit_now){
2118
if (not quit_now){
2448
2119
exitcode = EXIT_SUCCESS;
2449
2120
}
2450
2121
2465
2136
config.publish_domain = 0;
2466
2137
2467
2138
/* Allocate a new server */
2468
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2469
&config, NULL, NULL, &ret_errno);
2139
mc.server = avahi_server_new(avahi_simple_poll_get
2140
(mc.simple_poll), &config, NULL,
2141
NULL, &error);
2470
2142
2471
2143
/* Free the Avahi configuration data */
2472
2144
avahi_server_config_free(&config);
2474
2146
2475
2147
/* Check if creating the Avahi server object succeeded */
2476
2148
if(mc.server == NULL){
2477
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2478
avahi_strerror(ret_errno));
2149
fprintf(stderr, "Mandos plugin mandos-client: "
2150
"Failed to create Avahi server: %s\n",
2151
avahi_strerror(error));
2479
2152
exitcode = EX_UNAVAILABLE;
2480
2153
goto end;
2481
2154
}
2487
2160
/* Create the Avahi service browser */
2488
2161
sb = avahi_s_service_browser_new(mc.server, if_index,
2489
2162
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2490
NULL, 0, browse_callback,
2491
(void *)&mc);
2163
NULL, 0, browse_callback, NULL);
2492
2164
if(sb == NULL){
2493
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2494
avahi_strerror(avahi_server_errno(mc.server)));
2165
fprintf(stderr, "Mandos plugin mandos-client: "
2166
"Failed to create service browser: %s\n",
2167
avahi_strerror(avahi_server_errno(mc.server)));
2495
2168
exitcode = EX_UNAVAILABLE;
2496
2169
goto end;
2497
2170
}
2503
2176
/* Run the main loop */
2504
2177
2505
2178
if(debug){
2506
fprintf_plus(stderr, "Starting Avahi loop search\n");
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"Starting Avahi loop search\n");
2507
2181
}
2508
2509
ret = avahi_loop_with_timeout(simple_poll,
2510
(int)(retry_interval * 1000), &mc);
2182
2183
ret = avahi_loop_with_timeout(mc.simple_poll,
2184
(int)(retry_interval * 1000));
2511
2185
if(debug){
2512
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2513
(ret == 0) ? "successfully" : "with error");
2186
fprintf(stderr, "Mandos plugin mandos-client: "
2187
"avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2514
2189
}
2515
2190
2516
2191
end:
2517
2192
2518
2193
if(debug){
2519
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2194
fprintf(stderr, "Mandos plugin mandos-client: "
2195
"%s exiting\n", argv[0]);
2520
2196
}
2521
2197
2522
2198
/* Cleanup things */
2523
free(mc.interfaces);
2524
2525
2199
if(sb != NULL)
2526
2200
avahi_s_service_browser_free(sb);
2527
2201
2528
2202
if(mc.server != NULL)
2529
2203
avahi_server_free(mc.server);
2530
2204
2531
if(simple_poll != NULL)
2532
avahi_simple_poll_free(simple_poll);
2205
if(mc.simple_poll != NULL)
2206
avahi_simple_poll_free(mc.simple_poll);
2533
2207
2534
2208
if(gnutls_initialized){
2535
2209
gnutls_certificate_free_credentials(mc.cred);
2540
2214
if(gpgme_initialized){
2541
2215
gpgme_release(mc.ctx);
2542
2216
}
2543
2217
2544
2218
/* Cleans up the circular linked list of Mandos servers the client
2545
2219
has seen */
2546
2220
if(mc.current_server != NULL){
2552
2226
}
2553
2227
}
2554
2228
2555
/* Re-raise privileges */
2556
{
2557
ret_errno = raise_privileges();
2558
if(ret_errno != 0){
2559
perror_plus("Failed to raise privileges");
2560
} else {
2561
2562
/* Run network hooks */
2563
run_network_hooks("stop", interfaces_hooks != NULL ?
2564
interfaces_hooks : "", delay);
2565
2566
/* Take down the network interfaces which were brought up */
2567
{
2568
char *interface = NULL;
2569
while((interface=argz_next(interfaces_to_take_down,
2570
interfaces_to_take_down_size,
2571
interface))){
2572
ret_errno = take_down_interface(interface);
2573
if(ret_errno != 0){
2574
errno = ret_errno;
2575
perror_plus("Failed to take down interface");
2576
}
2577
}
2578
if(debug and (interfaces_to_take_down == NULL)){
2579
fprintf_plus(stderr, "No interfaces needed to be taken"
2580
" down\n");
2581
}
2582
}
2229
/* XXX run network hooks "stop" here */
2230
2231
/* Take down the network interface */
2232
if(take_down_interface){
2233
/* Re-raise priviliges */
2234
errno = 0;
2235
ret = seteuid(0);
2236
if(ret == -1){
2237
perror_plus("seteuid");
2583
2238
}
2584
2585
ret_errno = lower_privileges_permanently();
2586
if(ret_errno != 0){
2587
perror_plus("Failed to lower privileges permanently");
2239
if(geteuid() == 0){
2240
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2241
if(ret == -1){
2242
perror_plus("ioctl SIOCGIFFLAGS");
2243
} else if(network.ifr_flags & IFF_UP){
2244
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2245
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2246
if(ret == -1){
2247
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2248
}
2249
}
2250
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2251
if(ret == -1){
2252
perror_plus("close");
2253
}
2254
/* Lower privileges permanently */
2255
errno = 0;
2256
ret = setuid(uid);
2257
if(ret == -1){
2258
perror_plus("setuid");
2259
}
2588
2260
}
2589
2261
}
2590
2262
2591
free(interfaces_to_take_down);
2592
free(interfaces_hooks);
2593
2594
2263
/* Removes the GPGME temp directory and all files inside */
2595
if(tempdir != NULL){
2264
if(tempdir_created){
2596
2265
struct dirent **direntries = NULL;
2597
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2598
O_NOFOLLOW));
2599
if(tempdir_fd == -1){
2600
perror_plus("open");
2601
} else {
2602
#ifdef __GLIBC__
2603
#if __GLIBC_PREREQ(2, 15)
2604
int numentries = scandirat(tempdir_fd, ".", &direntries,
2605
notdotentries, alphasort);
2606
#else /* not __GLIBC_PREREQ(2, 15) */
2607
int numentries = scandir(tempdir, &direntries, notdotentries,
2608
alphasort);
2609
#endif /* not __GLIBC_PREREQ(2, 15) */
2610
#else /* not __GLIBC__ */
2611
int numentries = scandir(tempdir, &direntries, notdotentries,
2612
alphasort);
2613
#endif /* not __GLIBC__ */
2614
if(numentries >= 0){
2615
for(int i = 0; i < numentries; i++){
2616
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2617
if(ret == -1){
2618
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2619
" \"%s\", 0): %s\n", tempdir,
2620
direntries[i]->d_name, strerror(errno));
2621
}
2622
}
2623
2624
/* need to clean even if 0 because man page doesn't specify */
2625
free(direntries);
2626
if(numentries == -1){
2627
perror_plus("scandir");
2628
}
2629
ret = rmdir(tempdir);
2630
if(ret == -1 and errno != ENOENT){
2631
perror_plus("rmdir");
2632
}
2266
struct dirent *direntry = NULL;
2267
int numentries = scandir(tempdir, &direntries, notdotentries,
2268
alphasort);
2269
if (numentries > 0){
2270
for(int i = 0; i < numentries; i++){
2271
direntry = direntries[i];
2272
char *fullname = NULL;
2273
ret = asprintf(&fullname, "%s/%s", tempdir,
2274
direntry->d_name);
2275
if(ret < 0){
2276
perror_plus("asprintf");
2277
continue;
2278
}
2279
ret = remove(fullname);
2280
if(ret == -1){
2281
fprintf(stderr, "Mandos plugin mandos-client: "
2282
"remove(\"%s\"): %s\n", fullname, strerror(errno));
2283
}
2284
free(fullname);
2633
2285
}
2634
TEMP_FAILURE_RETRY(close(tempdir_fd));
2286
}
2287
2288
/* need to clean even if 0 because man page doesn't specify */
2289
free(direntries);
2290
if (numentries == -1){
2291
perror_plus("scandir");
2292
}
2293
ret = rmdir(tempdir);
2294
if(ret == -1 and errno != ENOENT){
2295
perror_plus("rmdir");
2635
2296
}
2636
2297
}
2637
2298
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0