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» Revision
237.7.255
(compared to revision 237.16.5)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2014-06-15 02:48:49 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 317.
- Revision ID: teddy@recompile.se-20140615024849-68x3q8g4yzadl33s
mandos: New "--no-zeroconf" option. Also make "--socket=0" work.
* mandos (main): New "--no-zeroconf" option. Also do not interpret
socket=0 as no socket.
* mandos-options.xml (zeroconf): New.
* mandos.conf (socket, zeroconf): New.
* mandos.xml (SYNOPSIS, OPTIONS): Added "--no-zeroconf".
* mandos (main): New "--no-zeroconf" option. Also do not interpret
socket=0 as no socket.
* mandos-options.xml (zeroconf): New.
* mandos.conf (socket, zeroconf): New.
* mandos.xml (SYNOPSIS, OPTIONS): Added "--no-zeroconf".
- files added:
- debian/mandos-client.examples
- debian/upstream
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_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
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
78
79
#include <iso646.h> /* not, or, and */
79
80
#include <argp.h> /* struct argp_option, error_t, struct
80
81
argp_state, struct argp,
87
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
90
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() */
90
98
91
99
#ifdef __linux__
92
100
#include <sys/klog.h> /* klogctl() */
110
118
init_gnutls_session(),
111
119
GNUTLS_* */
112
120
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
115
123
116
124
/* GPGME */
117
125
#include <gpgme.h> /* All GPGME types, constants and
134
142
static const char sys_class_net[] = "/sys/class/net";
135
143
char *connect_to = NULL;
136
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
137
148
138
149
/* Doubly linked list that need to be circularly linked when used */
139
150
typedef struct server{
140
151
const char *ip;
141
uint16_t port;
152
in_port_t port;
142
153
AvahiIfIndex if_index;
143
154
int af;
144
155
struct timespec last_seen;
148
159
149
160
/* Used for passing in values through the Avahi callback functions */
150
161
typedef struct {
151
AvahiSimplePoll *simple_poll;
152
162
AvahiServer *server;
153
163
gnutls_certificate_credentials_t cred;
154
164
unsigned int dh_bits;
156
166
const char *priority;
157
167
gpgme_ctx_t ctx;
158
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
159
171
} mandos_context;
160
172
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 };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
166
175
167
176
sig_atomic_t quit_now = 0;
168
177
int signal_received = 0;
169
178
170
179
/* Function to use when printing errors */
171
180
void perror_plus(const char *print_text){
181
int e = errno;
172
182
fprintf(stderr, "Mandos plugin %s: ",
173
183
program_invocation_short_name);
184
errno = e;
174
185
perror(print_text);
175
186
}
176
187
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
177
198
/*
178
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
179
200
* bytes. "buffer_capacity" is how much is currently allocated,
180
201
* "buffer_length" is how much is already used.
181
202
*/
203
__attribute__((nonnull, warn_unused_result))
182
204
size_t incbuffer(char **buffer, size_t buffer_length,
183
size_t buffer_capacity){
205
size_t buffer_capacity){
184
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
185
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
186
if(buffer == NULL){
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;
187
213
return 0;
188
214
}
215
*buffer = new_buf;
189
216
buffer_capacity += BUFFER_SIZE;
190
217
}
191
218
return buffer_capacity;
192
219
}
193
220
194
221
/* Add server to set of servers to retry periodically */
195
int add_server(const char *ip, uint16_t port,
196
AvahiIfIndex if_index,
197
int af){
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){
198
225
int ret;
199
226
server *new_server = malloc(sizeof(server));
200
227
if(new_server == NULL){
201
228
perror_plus("malloc");
202
return -1;
229
return false;
203
230
}
204
231
*new_server = (server){ .ip = strdup(ip),
205
.port = port,
206
.if_index = if_index,
207
.af = af };
232
.port = port,
233
.if_index = if_index,
234
.af = af };
208
235
if(new_server->ip == NULL){
209
236
perror_plus("strdup");
210
return -1;
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;
211
243
}
212
244
/* Special case of first server */
213
if (mc.current_server == NULL){
245
if(*current_server == NULL){
214
246
new_server->next = new_server;
215
247
new_server->prev = new_server;
216
mc.current_server = new_server;
217
/* Place the new server last in the list */
248
*current_server = new_server;
218
249
} else {
219
new_server->next = mc.current_server;
220
new_server->prev = mc.current_server->prev;
250
/* Place the new server last in the list */
251
new_server->next = *current_server;
252
new_server->prev = (*current_server)->prev;
221
253
new_server->prev->next = new_server;
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;
254
(*current_server)->prev = new_server;
255
}
256
return true;
230
257
}
231
258
232
259
/*
233
260
* Initialize GPGME.
234
261
*/
235
static bool init_gpgme(const char *seckey,
236
const char *pubkey, const char *tempdir){
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){
237
267
gpgme_error_t rc;
238
268
gpgme_engine_info_t engine_info;
239
269
240
241
270
/*
242
271
* Helper function to insert pub and seckey to the engine keyring.
243
272
*/
244
bool import_key(const char *filename){
273
bool import_key(const char * const filename){
245
274
int ret;
246
275
int fd;
247
276
gpgme_data_t pgp_data;
254
283
255
284
rc = gpgme_data_new_from_fd(&pgp_data, fd);
256
285
if(rc != GPG_ERR_NO_ERROR){
257
fprintf(stderr, "Mandos plugin mandos-client: "
258
"bad gpgme_data_new_from_fd: %s: %s\n",
259
gpgme_strsource(rc), gpgme_strerror(rc));
286
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
260
288
return false;
261
289
}
262
290
263
rc = gpgme_op_import(mc.ctx, pgp_data);
291
rc = gpgme_op_import(mc->ctx, pgp_data);
264
292
if(rc != GPG_ERR_NO_ERROR){
265
fprintf(stderr, "Mandos plugin mandos-client: "
266
"bad gpgme_op_import: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
293
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
268
295
return false;
269
296
}
270
297
277
304
}
278
305
279
306
if(debug){
280
fprintf(stderr, "Mandos plugin mandos-client: "
281
"Initializing GPGME\n");
307
fprintf_plus(stderr, "Initializing GPGME\n");
282
308
}
283
309
284
310
/* Init GPGME */
285
311
gpgme_check_version(NULL);
286
312
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
287
313
if(rc != GPG_ERR_NO_ERROR){
288
fprintf(stderr, "Mandos plugin mandos-client: "
289
"bad gpgme_engine_check_version: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
314
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
315
gpgme_strsource(rc), gpgme_strerror(rc));
291
316
return false;
292
317
}
293
318
294
319
/* Set GPGME home directory for the OpenPGP engine only */
295
320
rc = gpgme_get_engine_info(&engine_info);
296
321
if(rc != GPG_ERR_NO_ERROR){
297
fprintf(stderr, "Mandos plugin mandos-client: "
298
"bad gpgme_get_engine_info: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
322
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
323
gpgme_strsource(rc), gpgme_strerror(rc));
300
324
return false;
301
325
}
302
326
while(engine_info != NULL){
308
332
engine_info = engine_info->next;
309
333
}
310
334
if(engine_info == NULL){
311
fprintf(stderr, "Mandos plugin mandos-client: "
312
"Could not set GPGME home dir to %s\n", tempdir);
335
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
336
tempdir);
313
337
return false;
314
338
}
315
339
316
340
/* Create new GPGME "context" */
317
rc = gpgme_new(&(mc.ctx));
341
rc = gpgme_new(&(mc->ctx));
318
342
if(rc != GPG_ERR_NO_ERROR){
319
fprintf(stderr, "Mandos plugin mandos-client: "
320
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
321
gpgme_strerror(rc));
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
345
gpgme_strerror(rc));
322
346
return false;
323
347
}
324
348
333
357
* Decrypt OpenPGP data.
334
358
* Returns -1 on error
335
359
*/
360
__attribute__((nonnull, warn_unused_result))
336
361
static ssize_t pgp_packet_decrypt(const char *cryptotext,
337
362
size_t crypto_size,
338
char **plaintext){
363
char **plaintext,
364
mandos_context *mc){
339
365
gpgme_data_t dh_crypto, dh_plain;
340
366
gpgme_error_t rc;
341
367
ssize_t ret;
343
369
ssize_t plaintext_length = 0;
344
370
345
371
if(debug){
346
fprintf(stderr, "Mandos plugin mandos-client: "
347
"Trying to decrypt OpenPGP data\n");
372
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
348
373
}
349
374
350
375
/* Create new GPGME data buffer from memory cryptotext */
351
376
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
352
377
0);
353
378
if(rc != GPG_ERR_NO_ERROR){
354
fprintf(stderr, "Mandos plugin mandos-client: "
355
"bad gpgme_data_new_from_mem: %s: %s\n",
356
gpgme_strsource(rc), gpgme_strerror(rc));
379
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
357
381
return -1;
358
382
}
359
383
360
384
/* Create new empty GPGME data buffer for the plaintext */
361
385
rc = gpgme_data_new(&dh_plain);
362
386
if(rc != GPG_ERR_NO_ERROR){
363
fprintf(stderr, "Mandos plugin mandos-client: "
364
"bad gpgme_data_new: %s: %s\n",
365
gpgme_strsource(rc), gpgme_strerror(rc));
387
fprintf_plus(stderr, "Mandos plugin mandos-client: "
388
"bad gpgme_data_new: %s: %s\n",
389
gpgme_strsource(rc), gpgme_strerror(rc));
366
390
gpgme_data_release(dh_crypto);
367
391
return -1;
368
392
}
369
393
370
394
/* Decrypt data from the cryptotext data buffer to the plaintext
371
395
data buffer */
372
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
396
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
373
397
if(rc != GPG_ERR_NO_ERROR){
374
fprintf(stderr, "Mandos plugin mandos-client: "
375
"bad gpgme_op_decrypt: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
398
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
377
400
plaintext_length = -1;
378
401
if(debug){
379
402
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
403
result = gpgme_op_decrypt_result(mc->ctx);
381
404
if(result == NULL){
382
fprintf(stderr, "Mandos plugin mandos-client: "
383
"gpgme_op_decrypt_result failed\n");
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
384
406
} else {
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);
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);
391
411
if(result->file_name != NULL){
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"File name: %s\n", result->file_name);
412
fprintf_plus(stderr, "File name: %s\n", result->file_name);
394
413
}
395
414
gpgme_recipient_t recipient;
396
415
recipient = result->recipients;
397
416
while(recipient != NULL){
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");
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");
407
424
recipient = recipient->next;
408
425
}
409
426
}
412
429
}
413
430
414
431
if(debug){
415
fprintf(stderr, "Mandos plugin mandos-client: "
416
"Decryption of OpenPGP data succeeded\n");
432
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
417
433
}
418
434
419
435
/* Seek back to the beginning of the GPGME plaintext data buffer */
426
442
*plaintext = NULL;
427
443
while(true){
428
444
plaintext_capacity = incbuffer(plaintext,
429
(size_t)plaintext_length,
430
plaintext_capacity);
445
(size_t)plaintext_length,
446
plaintext_capacity);
431
447
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
448
perror_plus("incbuffer");
449
plaintext_length = -1;
450
goto decrypt_end;
435
451
}
436
452
437
453
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
450
466
}
451
467
452
468
if(debug){
453
fprintf(stderr, "Mandos plugin mandos-client: "
454
"Decrypted password is: ");
469
fprintf_plus(stderr, "Decrypted password is: ");
455
470
for(ssize_t i = 0; i < plaintext_length; i++){
456
471
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
457
472
}
468
483
return plaintext_length;
469
484
}
470
485
471
static const char * safer_gnutls_strerror(int value){
472
const char *ret = gnutls_strerror(value); /* Spurious warning from
473
-Wunreachable-code */
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
488
const char *ret = gnutls_strerror(value);
474
489
if(ret == NULL)
475
490
ret = "(unknown)";
476
491
return ret;
477
492
}
478
493
479
494
/* GnuTLS log function callback */
495
__attribute__((nonnull))
480
496
static void debuggnutls(__attribute__((unused)) int level,
481
497
const char* string){
482
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
498
fprintf_plus(stderr, "GnuTLS: %s", string);
483
499
}
484
500
501
__attribute__((nonnull, warn_unused_result))
485
502
static int init_gnutls_global(const char *pubkeyfilename,
486
const char *seckeyfilename){
503
const char *seckeyfilename,
504
mandos_context *mc){
487
505
int ret;
488
506
489
507
if(debug){
490
fprintf(stderr, "Mandos plugin mandos-client: "
491
"Initializing GnuTLS\n");
508
fprintf_plus(stderr, "Initializing GnuTLS\n");
492
509
}
493
510
494
511
ret = gnutls_global_init();
495
512
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "Mandos plugin mandos-client: "
497
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
513
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
514
safer_gnutls_strerror(ret));
498
515
return -1;
499
516
}
500
517
507
524
}
508
525
509
526
/* OpenPGP credentials */
510
ret = gnutls_certificate_allocate_credentials(&mc.cred);
527
ret = gnutls_certificate_allocate_credentials(&mc->cred);
511
528
if(ret != GNUTLS_E_SUCCESS){
512
fprintf(stderr, "Mandos plugin mandos-client: "
513
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
530
safer_gnutls_strerror(ret));
514
531
gnutls_global_deinit();
515
532
return -1;
516
533
}
517
534
518
535
if(debug){
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);
536
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
537
" secret key %s as GnuTLS credentials\n",
538
pubkeyfilename,
539
seckeyfilename);
523
540
}
524
541
525
542
ret = gnutls_certificate_set_openpgp_key_file
526
(mc.cred, pubkeyfilename, seckeyfilename,
543
(mc->cred, pubkeyfilename, seckeyfilename,
527
544
GNUTLS_OPENPGP_FMT_BASE64);
528
545
if(ret != GNUTLS_E_SUCCESS){
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));
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));
535
551
goto globalfail;
536
552
}
537
553
538
554
/* GnuTLS server initialization */
539
ret = gnutls_dh_params_init(&mc.dh_params);
555
ret = gnutls_dh_params_init(&mc->dh_params);
540
556
if(ret != GNUTLS_E_SUCCESS){
541
fprintf(stderr, "Mandos plugin mandos-client: "
542
"Error in GnuTLS DH parameter initialization:"
543
" %s\n", safer_gnutls_strerror(ret));
557
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
558
" initialization: %s\n",
559
safer_gnutls_strerror(ret));
544
560
goto globalfail;
545
561
}
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
547
563
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Mandos plugin mandos-client: "
549
"Error in GnuTLS prime generation: %s\n",
550
safer_gnutls_strerror(ret));
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
safer_gnutls_strerror(ret));
551
566
goto globalfail;
552
567
}
553
568
554
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
555
570
556
571
return 0;
557
572
558
573
globalfail:
559
574
560
gnutls_certificate_free_credentials(mc.cred);
575
gnutls_certificate_free_credentials(mc->cred);
561
576
gnutls_global_deinit();
562
gnutls_dh_params_deinit(mc.dh_params);
577
gnutls_dh_params_deinit(mc->dh_params);
563
578
return -1;
564
579
}
565
580
566
static int init_gnutls_session(gnutls_session_t *session){
581
__attribute__((nonnull, warn_unused_result))
582
static int init_gnutls_session(gnutls_session_t *session,
583
mandos_context *mc){
567
584
int ret;
568
585
/* GnuTLS session creation */
569
586
do {
573
590
}
574
591
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
575
592
if(ret != GNUTLS_E_SUCCESS){
576
fprintf(stderr, "Mandos plugin mandos-client: "
577
"Error in GnuTLS session initialization: %s\n",
578
safer_gnutls_strerror(ret));
593
fprintf_plus(stderr,
594
"Error in GnuTLS session initialization: %s\n",
595
safer_gnutls_strerror(ret));
579
596
}
580
597
581
598
{
582
599
const char *err;
583
600
do {
584
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
601
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
585
602
if(quit_now){
586
603
gnutls_deinit(*session);
587
604
return -1;
588
605
}
589
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
590
607
if(ret != GNUTLS_E_SUCCESS){
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));
608
fprintf_plus(stderr, "Syntax error at: %s\n", err);
609
fprintf_plus(stderr, "GnuTLS error: %s\n",
610
safer_gnutls_strerror(ret));
595
611
gnutls_deinit(*session);
596
612
return -1;
597
613
}
599
615
600
616
do {
601
617
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
602
mc.cred);
618
mc->cred);
603
619
if(quit_now){
604
620
gnutls_deinit(*session);
605
621
return -1;
606
622
}
607
623
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
608
624
if(ret != GNUTLS_E_SUCCESS){
609
fprintf(stderr, "Mandos plugin mandos-client: "
610
"Error setting GnuTLS credentials: %s\n",
611
safer_gnutls_strerror(ret));
625
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
626
safer_gnutls_strerror(ret));
612
627
gnutls_deinit(*session);
613
628
return -1;
614
629
}
616
631
/* ignore client certificate if any. */
617
632
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
618
633
619
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
620
635
621
636
return 0;
622
637
}
626
641
__attribute__((unused)) const char *txt){}
627
642
628
643
/* Called when a Mandos server is found */
629
static int start_mandos_communication(const char *ip, uint16_t port,
644
__attribute__((nonnull, warn_unused_result))
645
static int start_mandos_communication(const char *ip, in_port_t port,
630
646
AvahiIfIndex if_index,
631
int af){
647
int af, mandos_context *mc){
632
648
int ret, tcp_sd = -1;
633
649
ssize_t sret;
634
union {
635
struct sockaddr_in in;
636
struct sockaddr_in6 in6;
637
} to;
650
struct sockaddr_storage to;
638
651
char *buffer = NULL;
639
652
char *decrypted_buffer = NULL;
640
653
size_t buffer_length = 0;
659
672
pf = PF_INET;
660
673
break;
661
674
default:
662
fprintf(stderr, "Mandos plugin mandos-client: "
663
"Bad address family: %d\n", af);
675
fprintf_plus(stderr, "Bad address family: %d\n", af);
664
676
errno = EINVAL;
665
677
return -1;
666
678
}
667
679
668
ret = init_gnutls_session(&session);
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);
669
713
if(ret != 0){
670
714
return -1;
671
715
}
672
716
673
717
if(debug){
674
fprintf(stderr, "Mandos plugin mandos-client: "
675
"Setting up a TCP connection to %s, port %" PRIu16
676
"\n", ip, port);
718
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
719
PRIuMAX "\n", ip, (uintmax_t)port);
677
720
}
678
721
679
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
691
734
692
735
memset(&to, 0, sizeof(to));
693
736
if(af == AF_INET6){
694
to.in6.sin6_family = (sa_family_t)af;
695
ret = inet_pton(af, ip, &to.in6.sin6_addr);
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
696
739
} else { /* IPv4 */
697
to.in.sin_family = (sa_family_t)af;
698
ret = inet_pton(af, ip, &to.in.sin_addr);
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
699
742
}
700
743
if(ret < 0 ){
701
744
int e = errno;
705
748
}
706
749
if(ret == 0){
707
750
int e = errno;
708
fprintf(stderr, "Mandos plugin mandos-client: "
709
"Bad address: %s\n", ip);
751
fprintf_plus(stderr, "Bad address: %s\n", ip);
710
752
errno = e;
711
753
goto mandos_end;
712
754
}
713
755
if(af == AF_INET6){
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*/
756
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
757
if(IN6_IS_ADDR_LINKLOCAL
758
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
721
759
if(if_index == AVAHI_IF_UNSPEC){
722
fprintf(stderr, "Mandos plugin mandos-client: "
723
"An IPv6 link-local address is incomplete"
724
" without a network interface\n");
760
fprintf_plus(stderr, "An IPv6 link-local address is"
761
" incomplete without a network interface\n");
725
762
errno = EINVAL;
726
763
goto mandos_end;
727
764
}
728
765
/* Set the network interface number as scope */
729
to.in6.sin6_scope_id = (uint32_t)if_index;
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
730
767
}
731
768
} else {
732
to.in.sin_port = htons(port); /* Spurious warnings from
733
-Wconversion and
734
-Wunreachable-code */
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
735
770
}
736
771
737
772
if(quit_now){
745
780
if(if_indextoname((unsigned int)if_index, interface) == NULL){
746
781
perror_plus("if_indextoname");
747
782
} else {
748
fprintf(stderr, "Mandos plugin mandos-client: "
749
"Connection to: %s%%%s, port %" PRIu16 "\n",
750
ip, interface, port);
783
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
784
"\n", ip, interface, (uintmax_t)port);
751
785
}
752
786
} else {
753
fprintf(stderr, "Mandos plugin mandos-client: "
754
"Connection to: %s, port %" PRIu16 "\n", ip, port);
787
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
788
ip, (uintmax_t)port);
755
789
}
756
790
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
757
791
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
758
const char *pcret;
759
792
if(af == AF_INET6){
760
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
761
sizeof(addrstr));
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
762
797
} else {
763
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
764
sizeof(addrstr));
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
765
802
}
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
}
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);
773
809
}
774
810
}
775
811
779
815
}
780
816
781
817
if(af == AF_INET6){
782
ret = connect(tcp_sd, &to.in6, sizeof(to));
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
783
820
} else {
784
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
785
823
}
786
824
if(ret < 0){
787
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
788
826
int e = errno;
789
827
perror_plus("connect");
790
828
errno = e;
802
840
while(true){
803
841
size_t out_size = strlen(out);
804
842
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
805
out_size - written));
843
out_size - written));
806
844
if(ret == -1){
807
845
int e = errno;
808
846
perror_plus("write");
828
866
}
829
867
830
868
if(debug){
831
fprintf(stderr, "Mandos plugin mandos-client: "
832
"Establishing TLS session with %s\n", ip);
869
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
833
870
}
834
871
835
872
if(quit_now){
837
874
goto mandos_end;
838
875
}
839
876
840
/* Spurious warning from -Wint-to-pointer-cast */
841
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
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);
842
882
843
883
if(quit_now){
844
884
errno = EINTR;
855
895
856
896
if(ret != GNUTLS_E_SUCCESS){
857
897
if(debug){
858
fprintf(stderr, "Mandos plugin mandos-client: "
859
"*** GnuTLS Handshake failed ***\n");
898
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
860
899
gnutls_perror(ret);
861
900
}
862
901
errno = EPROTO;
866
905
/* Read OpenPGP packet that contains the wanted password */
867
906
868
907
if(debug){
869
fprintf(stderr, "Mandos plugin mandos-client: "
870
"Retrieving OpenPGP encrypted password from %s\n", ip);
908
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
909
" %s\n", ip);
871
910
}
872
911
873
912
while(true){
878
917
}
879
918
880
919
buffer_capacity = incbuffer(&buffer, buffer_length,
881
buffer_capacity);
920
buffer_capacity);
882
921
if(buffer_capacity == 0){
883
922
int e = errno;
884
923
perror_plus("incbuffer");
911
950
}
912
951
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
913
952
if(ret < 0){
914
fprintf(stderr, "Mandos plugin mandos-client: "
915
"*** GnuTLS Re-handshake failed ***\n");
953
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
954
"***\n");
916
955
gnutls_perror(ret);
917
956
errno = EPROTO;
918
957
goto mandos_end;
919
958
}
920
959
break;
921
960
default:
922
fprintf(stderr, "Mandos plugin mandos-client: "
923
"Unknown error while reading data from"
924
" encrypted session with Mandos server\n");
961
fprintf_plus(stderr, "Unknown error while reading data from"
962
" encrypted session with Mandos server\n");
925
963
gnutls_bye(session, GNUTLS_SHUT_RDWR);
926
964
errno = EIO;
927
965
goto mandos_end;
932
970
}
933
971
934
972
if(debug){
935
fprintf(stderr, "Mandos plugin mandos-client: "
936
"Closing TLS session\n");
973
fprintf_plus(stderr, "Closing TLS session\n");
937
974
}
938
975
939
976
if(quit_now){
951
988
952
989
if(buffer_length > 0){
953
990
ssize_t decrypted_buffer_size;
954
decrypted_buffer_size = pgp_packet_decrypt(buffer,
955
buffer_length,
956
&decrypted_buffer);
991
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
992
&decrypted_buffer, mc);
957
993
if(decrypted_buffer_size >= 0){
958
994
959
995
written = 0;
969
1005
if(ret == 0 and ferror(stdout)){
970
1006
int e = errno;
971
1007
if(debug){
972
fprintf(stderr, "Mandos plugin mandos-client: "
973
"Error writing encrypted data: %s\n",
974
strerror(errno));
1008
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1009
strerror(errno));
975
1010
}
976
1011
errno = e;
977
1012
goto mandos_end;
1008
1043
return retval;
1009
1044
}
1010
1045
1046
__attribute__((nonnull))
1011
1047
static void resolve_callback(AvahiSServiceResolver *r,
1012
1048
AvahiIfIndex interface,
1013
1049
AvahiProtocol proto,
1021
1057
AVAHI_GCC_UNUSED AvahiStringList *txt,
1022
1058
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1023
1059
flags,
1024
AVAHI_GCC_UNUSED void* userdata){
1025
assert(r);
1060
void *mc){
1061
if(r == NULL){
1062
return;
1063
}
1026
1064
1027
1065
/* Called whenever a service has been resolved successfully or
1028
1066
timed out */
1034
1072
switch(event){
1035
1073
default:
1036
1074
case AVAHI_RESOLVER_FAILURE:
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)));
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)));
1041
1080
break;
1042
1081
1043
1082
case AVAHI_RESOLVER_FOUND:
1045
1084
char ip[AVAHI_ADDRESS_STR_MAX];
1046
1085
avahi_address_snprint(ip, sizeof(ip), address);
1047
1086
if(debug){
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);
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);
1052
1090
}
1053
int ret = start_mandos_communication(ip, port, interface,
1054
avahi_proto_to_af(proto));
1091
int ret = start_mandos_communication(ip, (in_port_t)port,
1092
interface,
1093
avahi_proto_to_af(proto),
1094
mc);
1055
1095
if(ret == 0){
1056
avahi_simple_poll_quit(mc.simple_poll);
1096
avahi_simple_poll_quit(simple_poll);
1057
1097
} else {
1058
ret = add_server(ip, port, interface,
1059
avahi_proto_to_af(proto));
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
}
1060
1104
}
1061
1105
}
1062
1106
}
1072
1116
const char *domain,
1073
1117
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1074
1118
flags,
1075
AVAHI_GCC_UNUSED void* userdata){
1076
assert(b);
1119
void *mc){
1120
if(b == NULL){
1121
return;
1122
}
1077
1123
1078
1124
/* Called whenever a new services becomes available on the LAN or
1079
1125
is removed from the LAN */
1086
1132
default:
1087
1133
case AVAHI_BROWSER_FAILURE:
1088
1134
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);
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);
1093
1139
return;
1094
1140
1095
1141
case AVAHI_BROWSER_NEW:
1098
1144
the callback function is called the Avahi server will free the
1099
1145
resolver for us. */
1100
1146
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)));
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)));
1107
1155
break;
1108
1156
1109
1157
case AVAHI_BROWSER_REMOVE:
1112
1160
case AVAHI_BROWSER_ALL_FOR_NOW:
1113
1161
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1114
1162
if(debug){
1115
fprintf(stderr, "Mandos plugin mandos-client: "
1116
"No Mandos server found, still searching...\n");
1163
fprintf_plus(stderr, "No Mandos server found, still"
1164
" searching...\n");
1117
1165
}
1118
1166
break;
1119
1167
}
1128
1176
signal_received = sig;
1129
1177
int old_errno = errno;
1130
1178
/* set main loop to exit */
1131
if(mc.simple_poll != NULL){
1132
avahi_simple_poll_quit(mc.simple_poll);
1179
if(simple_poll != NULL){
1180
avahi_simple_poll_quit(simple_poll);
1133
1181
}
1134
1182
errno = old_errno;
1135
1183
}
1136
1184
1185
__attribute__((nonnull, warn_unused_result))
1137
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1138
1187
int ret;
1188
error_t ret_errno;
1139
1189
1140
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1141
1191
if(s < 0){
1192
ret_errno = errno;
1142
1193
perror_plus("socket");
1194
errno = ret_errno;
1143
1195
return false;
1144
1196
}
1145
1197
strcpy(ifr->ifr_name, ifname);
1146
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1147
1199
if(ret == -1){
1148
1200
if(debug){
1201
ret_errno = errno;
1149
1202
perror_plus("ioctl SIOCGIFFLAGS");
1203
errno = ret_errno;
1150
1204
}
1151
1205
return false;
1152
1206
}
1153
1207
return true;
1154
1208
}
1155
1209
1210
__attribute__((nonnull, warn_unused_result))
1156
1211
bool good_flags(const char *ifname, const struct ifreq *ifr){
1157
1212
1158
1213
/* Reject the loopback device */
1159
1214
if(ifr->ifr_flags & IFF_LOOPBACK){
1160
1215
if(debug){
1161
fprintf(stderr, "Mandos plugin mandos-client: "
1162
"Rejecting loopback interface \"%s\"\n", ifname);
1216
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1217
ifname);
1163
1218
}
1164
1219
return false;
1165
1220
}
1166
1221
/* Accept point-to-point devices only if connect_to is specified */
1167
1222
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1168
1223
if(debug){
1169
fprintf(stderr, "Mandos plugin mandos-client: "
1170
"Accepting point-to-point interface \"%s\"\n", ifname);
1224
fprintf_plus(stderr, "Accepting point-to-point interface"
1225
" \"%s\"\n", ifname);
1171
1226
}
1172
1227
return true;
1173
1228
}
1174
1229
/* Otherwise, reject non-broadcast-capable devices */
1175
1230
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1176
1231
if(debug){
1177
fprintf(stderr, "Mandos plugin mandos-client: "
1178
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1232
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1233
" \"%s\"\n", ifname);
1179
1234
}
1180
1235
return false;
1181
1236
}
1182
1237
/* Reject non-ARP interfaces (including dummy interfaces) */
1183
1238
if(ifr->ifr_flags & IFF_NOARP){
1184
1239
if(debug){
1185
fprintf(stderr, "Mandos plugin mandos-client: "
1186
"Rejecting non-ARP interface \"%s\"\n", ifname);
1240
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1241
ifname);
1187
1242
}
1188
1243
return false;
1189
1244
}
1190
1245
1191
1246
/* Accept this device */
1192
1247
if(debug){
1193
fprintf(stderr, "Mandos plugin mandos-client: "
1194
"Interface \"%s\" is good\n", ifname);
1248
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1195
1249
}
1196
1250
return true;
1197
1251
}
1201
1255
* corresponds to an acceptable network device.
1202
1256
* (This function is passed to scandir(3) as a filter function.)
1203
1257
*/
1258
__attribute__((nonnull, warn_unused_result))
1204
1259
int good_interface(const struct dirent *if_entry){
1205
1260
if(if_entry->d_name[0] == '.'){
1206
1261
return 0;
1209
1264
struct ifreq ifr;
1210
1265
if(not get_flags(if_entry->d_name, &ifr)){
1211
1266
if(debug){
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
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))
1271
1314
int notdotentries(const struct dirent *direntry){
1272
1315
/* Skip "." and ".." */
1273
1316
if(direntry->d_name[0] == '.'
1280
1323
}
1281
1324
1282
1325
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1283
1327
int runnable_hook(const struct dirent *direntry){
1284
1328
int ret;
1329
size_t sret;
1285
1330
struct stat st;
1286
1331
1287
1332
if((direntry->d_name)[0] == '\0'){
1289
1334
return 0;
1290
1335
}
1291
1336
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);
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);
1317
1351
if(ret == -1){
1318
1352
if(debug){
1319
perror_plus("Could not stat plugin");
1353
perror_plus("Could not stat hook");
1320
1354
}
1321
1355
return 0;
1322
1356
}
1323
1357
if(not (S_ISREG(st.st_mode))){
1324
1358
/* Not a regular file */
1359
if(debug){
1360
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1361
direntry->d_name);
1362
}
1325
1363
return 0;
1326
1364
}
1327
1365
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1328
1366
/* Not executable */
1367
if(debug){
1368
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1369
direntry->d_name);
1370
}
1329
1371
return 0;
1330
1372
}
1373
if(debug){
1374
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1375
direntry->d_name);
1376
}
1331
1377
return 1;
1332
1378
}
1333
1379
1334
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1380
__attribute__((nonnull, warn_unused_result))
1381
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1382
mandos_context *mc){
1335
1383
int ret;
1336
1384
struct timespec now;
1337
1385
struct timespec waited_time;
1338
1386
intmax_t block_time;
1339
1387
1340
1388
while(true){
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");
1389
if(mc->current_server == NULL){
1390
if(debug){
1391
fprintf_plus(stderr, "Wait until first server is found."
1392
" No timeout!\n");
1345
1393
}
1346
1394
ret = avahi_simple_poll_iterate(s, -1);
1347
1395
} else {
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Check current_server if we should run it,"
1351
" or wait\n");
1396
if(debug){
1397
fprintf_plus(stderr, "Check current_server if we should run"
1398
" it, or wait\n");
1352
1399
}
1353
1400
/* the current time */
1354
1401
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1359
1406
/* Calculating in ms how long time between now and server
1360
1407
who we visted longest time ago. Now - last seen. */
1361
1408
waited_time.tv_sec = (now.tv_sec
1362
- mc.current_server->last_seen.tv_sec);
1409
- mc->current_server->last_seen.tv_sec);
1363
1410
waited_time.tv_nsec = (now.tv_nsec
1364
- mc.current_server->last_seen.tv_nsec);
1411
- mc->current_server->last_seen.tv_nsec);
1365
1412
/* total time is 10s/10,000ms.
1366
1413
Converting to s from ms by dividing by 1,000,
1367
1414
and ns to ms by dividing by 1,000,000. */
1369
1416
- ((intmax_t)waited_time.tv_sec * 1000))
1370
1417
- ((intmax_t)waited_time.tv_nsec / 1000000));
1371
1418
1372
if (debug){
1373
fprintf(stderr, "Mandos plugin mandos-client: "
1374
"Blocking for %" PRIdMAX " ms\n", block_time);
1419
if(debug){
1420
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1421
block_time);
1375
1422
}
1376
1423
1377
1424
if(block_time <= 0){
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);
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);
1382
1429
if(ret == 0){
1383
avahi_simple_poll_quit(mc.simple_poll);
1430
avahi_simple_poll_quit(s);
1384
1431
return 0;
1385
1432
}
1386
1433
ret = clock_gettime(CLOCK_MONOTONIC,
1387
&mc.current_server->last_seen);
1434
&mc->current_server->last_seen);
1388
1435
if(ret == -1){
1389
1436
perror_plus("clock_gettime");
1390
1437
return -1;
1391
1438
}
1392
mc.current_server = mc.current_server->next;
1439
mc->current_server = mc->current_server->next;
1393
1440
block_time = 0; /* Call avahi to find new Mandos
1394
1441
servers, but don't block */
1395
1442
}
1397
1444
ret = avahi_simple_poll_iterate(s, (int)block_time);
1398
1445
}
1399
1446
if(ret != 0){
1400
if (ret > 0 or errno != EINTR){
1447
if(ret > 0 or errno != EINTR){
1401
1448
return (ret != 1) ? ret : 0;
1402
1449
}
1403
1450
}
1404
1451
}
1405
1452
}
1406
1453
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
}
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
}
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
1482
/* Set effective user ID to unprivileged saved user ID */
1483
__attribute__((warn_unused_result))
1484
error_t lower_privileges(void){
1485
error_t old_errno = errno;
1486
error_t ret_errno = 0;
1487
if(seteuid(uid) == -1){
1488
ret_errno = errno;
1489
}
1490
errno = old_errno;
1491
return ret_errno;
1492
}
1493
1494
/* Lower privileges permanently */
1495
__attribute__((warn_unused_result))
1496
error_t lower_privileges_permanently(void){
1497
error_t old_errno = errno;
1498
error_t ret_errno = 0;
1499
if(setuid(uid) == -1){
1500
ret_errno = errno;
1501
}
1502
errno = old_errno;
1503
return ret_errno;
1504
}
1505
1506
__attribute__((nonnull))
1507
void run_network_hooks(const char *mode, const char *interface,
1508
const float delay){
1509
struct dirent **direntries = NULL;
1510
if(hookdir_fd == -1){
1511
hookdir_fd = open(hookdir, O_RDONLY);
1512
if(hookdir_fd == -1){
1513
if(errno == ENOENT){
1514
if(debug){
1515
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1516
" found\n", hookdir);
1517
}
1518
} else {
1519
perror_plus("open");
1520
}
1521
return;
1522
}
1523
}
1524
#ifdef __GLIBC__
1525
#if __GLIBC_PREREQ(2, 15)
1526
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1527
runnable_hook, alphasort);
1528
#else /* not __GLIBC_PREREQ(2, 15) */
1529
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1530
alphasort);
1531
#endif /* not __GLIBC_PREREQ(2, 15) */
1532
#else /* not __GLIBC__ */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC__ */
1536
if(numhooks == -1){
1537
perror_plus("scandir");
1538
return;
1539
}
1540
struct dirent *direntry;
1541
int ret;
1542
int devnull = open("/dev/null", O_RDONLY);
1543
for(int i = 0; i < numhooks; i++){
1544
direntry = direntries[i];
1545
if(debug){
1546
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1547
direntry->d_name);
1548
}
1549
pid_t hook_pid = fork();
1550
if(hook_pid == 0){
1551
/* Child */
1552
/* Raise privileges */
1553
errno = raise_privileges_permanently();
1554
if(errno != 0){
1555
perror_plus("Failed to raise privileges");
1556
_exit(EX_NOPERM);
1557
}
1558
/* Set group */
1559
errno = 0;
1560
ret = setgid(0);
1561
if(ret == -1){
1562
perror_plus("setgid");
1563
_exit(EX_NOPERM);
1564
}
1565
/* Reset supplementary groups */
1566
errno = 0;
1567
ret = setgroups(0, NULL);
1568
if(ret == -1){
1569
perror_plus("setgroups");
1570
_exit(EX_NOPERM);
1571
}
1572
ret = dup2(devnull, STDIN_FILENO);
1573
if(ret == -1){
1574
perror_plus("dup2(devnull, STDIN_FILENO)");
1575
_exit(EX_OSERR);
1576
}
1577
ret = close(devnull);
1578
if(ret == -1){
1579
perror_plus("close");
1580
_exit(EX_OSERR);
1581
}
1582
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1583
if(ret == -1){
1584
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1585
_exit(EX_OSERR);
1586
}
1587
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1588
if(ret == -1){
1589
perror_plus("setenv");
1590
_exit(EX_OSERR);
1591
}
1592
ret = setenv("DEVICE", interface, 1);
1593
if(ret == -1){
1594
perror_plus("setenv");
1595
_exit(EX_OSERR);
1596
}
1597
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1598
if(ret == -1){
1599
perror_plus("setenv");
1600
_exit(EX_OSERR);
1601
}
1602
ret = setenv("MODE", mode, 1);
1603
if(ret == -1){
1604
perror_plus("setenv");
1605
_exit(EX_OSERR);
1606
}
1607
char *delaystring;
1608
ret = asprintf(&delaystring, "%f", (double)delay);
1609
if(ret == -1){
1610
perror_plus("asprintf");
1611
_exit(EX_OSERR);
1612
}
1613
ret = setenv("DELAY", delaystring, 1);
1614
if(ret == -1){
1615
free(delaystring);
1616
perror_plus("setenv");
1617
_exit(EX_OSERR);
1618
}
1619
free(delaystring);
1620
if(connect_to != NULL){
1621
ret = setenv("CONNECT", connect_to, 1);
1622
if(ret == -1){
1623
perror_plus("setenv");
1624
_exit(EX_OSERR);
1625
}
1626
}
1627
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1628
if(hook_fd == -1){
1629
perror_plus("openat");
1630
_exit(EXIT_FAILURE);
1631
}
1632
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1633
perror_plus("close");
1634
_exit(EXIT_FAILURE);
1635
}
1636
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1637
environ) == -1){
1638
perror_plus("fexecve");
1639
_exit(EXIT_FAILURE);
1640
}
1641
} else {
1642
int status;
1643
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1644
perror_plus("waitpid");
1645
continue;
1646
}
1647
if(WIFEXITED(status)){
1648
if(WEXITSTATUS(status) != 0){
1649
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1650
" with status %d\n", direntry->d_name,
1651
WEXITSTATUS(status));
1652
continue;
1653
}
1654
} else if(WIFSIGNALED(status)){
1655
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1656
" signal %d\n", direntry->d_name,
1657
WTERMSIG(status));
1658
continue;
1659
} else {
1660
fprintf_plus(stderr, "Warning: network hook \"%s\""
1661
" crashed\n", direntry->d_name);
1662
continue;
1663
}
1664
}
1665
if(debug){
1666
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1667
direntry->d_name);
1668
}
1669
}
1670
free(direntries);
1671
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1672
perror_plus("close");
1673
} else {
1674
hookdir_fd = -1;
1675
}
1676
close(devnull);
1677
}
1678
1679
__attribute__((nonnull, warn_unused_result))
1680
error_t bring_up_interface(const char *const interface,
1681
const float delay){
1682
error_t old_errno = errno;
1683
int ret;
1684
struct ifreq network;
1685
unsigned int if_index = if_nametoindex(interface);
1686
if(if_index == 0){
1687
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1688
errno = old_errno;
1689
return ENXIO;
1690
}
1691
1692
if(quit_now){
1693
errno = old_errno;
1694
return EINTR;
1695
}
1696
1697
if(not interface_is_up(interface)){
1698
error_t ret_errno = 0, ioctl_errno = 0;
1699
if(not get_flags(interface, &network)){
1700
ret_errno = errno;
1701
fprintf_plus(stderr, "Failed to get flags for interface "
1702
"\"%s\"\n", interface);
1703
errno = old_errno;
1704
return ret_errno;
1705
}
1706
network.ifr_flags |= IFF_UP; /* set flag */
1707
1708
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1709
if(sd == -1){
1710
ret_errno = errno;
1711
perror_plus("socket");
1712
errno = old_errno;
1713
return ret_errno;
1714
}
1715
1716
if(quit_now){
1717
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1718
if(ret == -1){
1719
perror_plus("close");
1720
}
1721
errno = old_errno;
1722
return EINTR;
1723
}
1724
1725
if(debug){
1726
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1727
interface);
1728
}
1729
1730
/* Raise privileges */
1731
ret_errno = raise_privileges();
1732
if(ret_errno != 0){
1733
errno = ret_errno;
1734
perror_plus("Failed to raise privileges");
1735
}
1736
1737
#ifdef __linux__
1738
int ret_linux;
1739
bool restore_loglevel = false;
1740
if(ret_errno == 0){
1741
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1742
messages about the network interface to mess up the prompt */
1743
ret_linux = klogctl(8, NULL, 5);
1744
if(ret_linux == -1){
1745
perror_plus("klogctl");
1746
} else {
1747
restore_loglevel = true;
1748
}
1749
}
1750
#endif /* __linux__ */
1751
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1752
ioctl_errno = errno;
1753
#ifdef __linux__
1754
if(restore_loglevel){
1755
ret_linux = klogctl(7, NULL, 0);
1756
if(ret_linux == -1){
1757
perror_plus("klogctl");
1758
}
1759
}
1760
#endif /* __linux__ */
1761
1762
/* If raise_privileges() succeeded above */
1763
if(ret_errno == 0){
1764
/* Lower privileges */
1765
ret_errno = lower_privileges();
1766
if(ret_errno != 0){
1767
errno = ret_errno;
1768
perror_plus("Failed to lower privileges");
1769
}
1770
}
1771
1772
/* Close the socket */
1773
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1774
if(ret == -1){
1775
perror_plus("close");
1776
}
1777
1778
if(ret_setflags == -1){
1779
errno = ioctl_errno;
1780
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1781
errno = old_errno;
1782
return ioctl_errno;
1783
}
1784
} else if(debug){
1785
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1786
interface);
1787
}
1788
1789
/* Sleep checking until interface is running.
1790
Check every 0.25s, up to total time of delay */
1791
for(int i=0; i < delay * 4; i++){
1792
if(interface_is_running(interface)){
1793
break;
1794
}
1795
struct timespec sleeptime = { .tv_nsec = 250000000 };
1796
ret = nanosleep(&sleeptime, NULL);
1797
if(ret == -1 and errno != EINTR){
1798
perror_plus("nanosleep");
1799
}
1800
}
1801
1802
errno = old_errno;
1803
return 0;
1804
}
1805
1806
__attribute__((nonnull, warn_unused_result))
1807
error_t take_down_interface(const char *const interface){
1808
error_t old_errno = errno;
1809
struct ifreq network;
1810
unsigned int if_index = if_nametoindex(interface);
1811
if(if_index == 0){
1812
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1813
errno = old_errno;
1814
return ENXIO;
1815
}
1816
if(interface_is_up(interface)){
1817
error_t ret_errno = 0, ioctl_errno = 0;
1818
if(not get_flags(interface, &network) and debug){
1819
ret_errno = errno;
1820
fprintf_plus(stderr, "Failed to get flags for interface "
1821
"\"%s\"\n", interface);
1822
errno = old_errno;
1823
return ret_errno;
1824
}
1825
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1826
1827
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1828
if(sd == -1){
1829
ret_errno = errno;
1830
perror_plus("socket");
1831
errno = old_errno;
1832
return ret_errno;
1833
}
1834
1835
if(debug){
1836
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1837
interface);
1838
}
1839
1840
/* Raise privileges */
1841
ret_errno = raise_privileges();
1842
if(ret_errno != 0){
1843
errno = ret_errno;
1844
perror_plus("Failed to raise privileges");
1845
}
1846
1847
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1848
ioctl_errno = errno;
1849
1850
/* If raise_privileges() succeeded above */
1851
if(ret_errno == 0){
1852
/* Lower privileges */
1853
ret_errno = lower_privileges();
1854
if(ret_errno != 0){
1855
errno = ret_errno;
1856
perror_plus("Failed to lower privileges");
1857
}
1858
}
1859
1860
/* Close the socket */
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1862
if(ret == -1){
1863
perror_plus("close");
1864
}
1865
1866
if(ret_setflags == -1){
1867
errno = ioctl_errno;
1868
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1869
errno = old_errno;
1870
return ioctl_errno;
1871
}
1872
} else if(debug){
1873
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1874
interface);
1875
}
1876
1877
errno = old_errno;
1878
return 0;
1879
}
1880
1407
1881
int main(int argc, char *argv[]){
1882
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1883
.priority = "SECURE256:!CTYPE-X.509:"
1884
"+CTYPE-OPENPGP", .current_server = NULL,
1885
.interfaces = NULL, .interfaces_size = 0 };
1408
1886
AvahiSServiceBrowser *sb = NULL;
1409
int error;
1887
error_t ret_errno;
1410
1888
int ret;
1411
1889
intmax_t tmpmax;
1412
1890
char *tmp;
1413
1891
int exitcode = EXIT_SUCCESS;
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;
1892
char *interfaces_to_take_down = NULL;
1893
size_t interfaces_to_take_down_size = 0;
1894
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1895
char old_tempdir[] = "/tmp/mandosXXXXXX";
1896
char *tempdir = NULL;
1422
1897
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1423
1898
const char *seckey = PATHDIR "/" SECKEY;
1424
1899
const char *pubkey = PATHDIR "/" PUBKEY;
1900
char *interfaces_hooks = NULL;
1425
1901
1426
1902
bool gnutls_initialized = false;
1427
1903
bool gpgme_initialized = false;
1489
1965
.group = 2 },
1490
1966
{ .name = "retry", .key = 132,
1491
1967
.arg = "SECONDS",
1492
.doc = "Retry interval used when denied by the mandos server",
1968
.doc = "Retry interval used when denied by the Mandos server",
1493
1969
.group = 2 },
1494
1970
{ .name = "network-hook-dir", .key = 133,
1495
1971
.arg = "DIR",
1518
1994
connect_to = arg;
1519
1995
break;
1520
1996
case 'i': /* --interface */
1521
interface = arg;
1997
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1998
arg, (int)',');
1999
if(ret_errno != 0){
2000
argp_error(state, "%s", strerror(ret_errno));
2001
}
1522
2002
break;
1523
2003
case 's': /* --seckey */
1524
2004
seckey = arg;
1567
2047
argp_state_help(state, state->out_stream,
1568
2048
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1569
2049
case 'V': /* --version */
1570
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1571
fprintf(state->out_stream, "%s\n", argp_program_version);
2050
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1572
2051
exit(argp_err_exit_status);
1573
2052
break;
1574
2053
default:
1601
2080
{
1602
2081
/* Work around Debian bug #633582:
1603
2082
<http://bugs.debian.org/633582> */
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");
2083
2084
/* Re-raise privileges */
2085
ret_errno = raise_privileges();
2086
if(ret_errno != 0){
2087
errno = ret_errno;
2088
perror_plus("Failed to raise privileges");
1669
2089
} else {
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
}
2090
struct stat st;
2091
2092
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2093
int seckey_fd = open(seckey, O_RDONLY);
2094
if(seckey_fd == -1){
2095
perror_plus("open");
2096
} else {
2097
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2098
if(ret == -1){
2099
perror_plus("fstat");
2100
} else {
2101
if(S_ISREG(st.st_mode)
2102
and st.st_uid == 0 and st.st_gid == 0){
2103
ret = fchown(seckey_fd, uid, gid);
2104
if(ret == -1){
2105
perror_plus("fchown");
2106
}
2107
}
2108
}
2109
TEMP_FAILURE_RETRY(close(seckey_fd));
2110
}
2111
}
2112
2113
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2114
int pubkey_fd = open(pubkey, O_RDONLY);
2115
if(pubkey_fd == -1){
2116
perror_plus("open");
2117
} else {
2118
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2119
if(ret == -1){
2120
perror_plus("fstat");
2121
} else {
2122
if(S_ISREG(st.st_mode)
2123
and st.st_uid == 0 and st.st_gid == 0){
2124
ret = fchown(pubkey_fd, uid, gid);
2125
if(ret == -1){
2126
perror_plus("fchown");
2127
}
2128
}
2129
}
2130
TEMP_FAILURE_RETRY(close(pubkey_fd));
2131
}
2132
}
2133
2134
/* Lower privileges */
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2138
perror_plus("Failed to lower privileges");
2139
}
2140
}
2141
}
2142
2143
/* Remove invalid interface names (except "none") */
2144
{
2145
char *interface = NULL;
2146
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2147
interface))){
2148
if(strcmp(interface, "none") != 0
2149
and if_nametoindex(interface) == 0){
2150
if(interface[0] != '\0'){
2151
fprintf_plus(stderr, "Not using nonexisting interface"
2152
" \"%s\"\n", interface);
2153
}
2154
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2155
interface = NULL;
2156
}
2157
}
2158
}
2159
2160
/* Run network hooks */
2161
{
2162
if(mc.interfaces != NULL){
2163
interfaces_hooks = malloc(mc.interfaces_size);
2164
if(interfaces_hooks == NULL){
2165
perror_plus("malloc");
2166
goto end;
2167
}
2168
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2169
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2170
}
2171
run_network_hooks("start", interfaces_hooks != NULL ?
2172
interfaces_hooks : "", delay);
1753
2173
}
1754
2174
1755
2175
if(not debug){
1756
2176
avahi_set_log_function(empty_log);
1757
2177
}
1758
2178
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
1793
2179
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1794
2180
from the signal handler */
1795
2181
/* Initialize the pseudo-RNG for Avahi */
1796
2182
srand((unsigned int) time(NULL));
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");
2183
simple_poll = avahi_simple_poll_new();
2184
if(simple_poll == NULL){
2185
fprintf_plus(stderr,
2186
"Avahi: Failed to create simple poll object.\n");
1801
2187
exitcode = EX_UNAVAILABLE;
1802
2188
goto end;
1803
2189
}
1865
2251
}
1866
2252
}
1867
2253
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");
2254
/* If no interfaces were specified, make a list */
2255
if(mc.interfaces == NULL){
2256
struct dirent **direntries = NULL;
2257
/* Look for any good interfaces */
2258
ret = scandir(sys_class_net, &direntries, good_interface,
2259
alphasort);
2260
if(ret >= 1){
2261
/* Add all found interfaces to interfaces list */
2262
for(int i = 0; i < ret; ++i){
2263
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2264
direntries[i]->d_name);
2265
if(ret_errno != 0){
2266
errno = ret_errno;
2267
perror_plus("argz_add");
2268
continue;
2269
}
2270
if(debug){
2271
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2272
direntries[i]->d_name);
2273
}
2274
}
2275
free(direntries);
2276
} else {
2277
if(ret == 0){
2278
free(direntries);
2279
}
2280
fprintf_plus(stderr, "Could not find a network interface\n");
2281
exitcode = EXIT_FAILURE;
2282
goto end;
2283
}
2284
}
2285
2286
/* Bring up interfaces which are down, and remove any "none"s */
2287
{
2288
char *interface = NULL;
2289
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2290
interface))){
2291
/* If interface name is "none", stop bringing up interfaces.
2292
Also remove all instances of "none" from the list */
2293
if(strcmp(interface, "none") == 0){
2294
argz_delete(&mc.interfaces, &mc.interfaces_size,
2295
interface);
2296
interface = NULL;
2297
while((interface = argz_next(mc.interfaces,
2298
mc.interfaces_size, interface))){
2299
if(strcmp(interface, "none") == 0){
2300
argz_delete(&mc.interfaces, &mc.interfaces_size,
2301
interface);
2302
interface = NULL;
1954
2303
}
1955
2304
}
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
2305
break;
1974
2306
}
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
}
2005
} else {
2006
/* Lower privileges permanently */
2007
ret = setuid(uid);
2008
if(ret == -1){
2009
perror_plus("setuid");
2010
}
2011
}
2307
bool interface_was_up = interface_is_up(interface);
2308
errno = bring_up_interface(interface, delay);
2309
if(not interface_was_up){
2310
if(errno != 0){
2311
perror_plus("Failed to bring up interface");
2312
} else {
2313
errno = argz_add(&interfaces_to_take_down,
2314
&interfaces_to_take_down_size,
2315
interface);
2316
if(errno != 0){
2317
perror_plus("argz_add");
2318
}
2319
}
2320
}
2321
}
2322
if(debug and (interfaces_to_take_down == NULL)){
2323
fprintf_plus(stderr, "No interfaces were brought up\n");
2324
}
2325
}
2326
2327
/* If we only got one interface, explicitly use only that one */
2328
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2329
if(debug){
2330
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2331
mc.interfaces);
2332
}
2333
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2012
2334
}
2013
2335
2014
2336
if(quit_now){
2015
2337
goto end;
2016
2338
}
2017
2339
2018
ret = init_gnutls_global(pubkey, seckey);
2340
ret = init_gnutls_global(pubkey, seckey, &mc);
2019
2341
if(ret == -1){
2020
fprintf(stderr, "Mandos plugin mandos-client: "
2021
"init_gnutls_global failed\n");
2342
fprintf_plus(stderr, "init_gnutls_global failed\n");
2022
2343
exitcode = EX_UNAVAILABLE;
2023
2344
goto end;
2024
2345
} else {
2029
2350
goto end;
2030
2351
}
2031
2352
2032
if(mkdtemp(tempdir) == NULL){
2353
/* Try /run/tmp before /tmp */
2354
tempdir = mkdtemp(run_tempdir);
2355
if(tempdir == NULL and errno == ENOENT){
2356
if(debug){
2357
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2358
run_tempdir, old_tempdir);
2359
}
2360
tempdir = mkdtemp(old_tempdir);
2361
}
2362
if(tempdir == NULL){
2033
2363
perror_plus("mkdtemp");
2034
2364
goto end;
2035
2365
}
2036
tempdir_created = true;
2037
2366
2038
2367
if(quit_now){
2039
2368
goto end;
2040
2369
}
2041
2370
2042
if(not init_gpgme(pubkey, seckey, tempdir)){
2043
fprintf(stderr, "Mandos plugin mandos-client: "
2044
"init_gpgme failed\n");
2371
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2372
fprintf_plus(stderr, "init_gpgme failed\n");
2045
2373
exitcode = EX_UNAVAILABLE;
2046
2374
goto end;
2047
2375
} else {
2056
2384
/* Connect directly, do not use Zeroconf */
2057
2385
/* (Mainly meant for debugging) */
2058
2386
char *address = strrchr(connect_to, ':');
2387
2059
2388
if(address == NULL){
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"No colon in address\n");
2389
fprintf_plus(stderr, "No colon in address\n");
2062
2390
exitcode = EX_USAGE;
2063
2391
goto end;
2064
2392
}
2067
2395
goto end;
2068
2396
}
2069
2397
2070
uint16_t port;
2398
in_port_t port;
2071
2399
errno = 0;
2072
2400
tmpmax = strtoimax(address+1, &tmp, 10);
2073
2401
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2074
or tmpmax != (uint16_t)tmpmax){
2075
fprintf(stderr, "Mandos plugin mandos-client: "
2076
"Bad port number\n");
2402
or tmpmax != (in_port_t)tmpmax){
2403
fprintf_plus(stderr, "Bad port number\n");
2077
2404
exitcode = EX_USAGE;
2078
2405
goto end;
2079
2406
}
2080
2407
2081
2408
if(quit_now){
2082
2409
goto end;
2083
2410
}
2084
2411
2085
port = (uint16_t)tmpmax;
2412
port = (in_port_t)tmpmax;
2086
2413
*address = '\0';
2087
2414
/* Colon in address indicates IPv6 */
2088
2415
int af;
2104
2431
}
2105
2432
2106
2433
while(not quit_now){
2107
ret = start_mandos_communication(address, port, if_index, af);
2434
ret = start_mandos_communication(address, port, if_index, af,
2435
&mc);
2108
2436
if(quit_now or ret == 0){
2109
2437
break;
2110
2438
}
2111
2439
if(debug){
2112
fprintf(stderr, "Mandos plugin mandos-client: "
2113
"Retrying in %d seconds\n", (int)retry_interval);
2440
fprintf_plus(stderr, "Retrying in %d seconds\n",
2441
(int)retry_interval);
2114
2442
}
2115
sleep((int)retry_interval);
2443
sleep((unsigned int)retry_interval);
2116
2444
}
2117
2445
2118
if (not quit_now){
2446
if(not quit_now){
2119
2447
exitcode = EXIT_SUCCESS;
2120
2448
}
2121
2449
2136
2464
config.publish_domain = 0;
2137
2465
2138
2466
/* Allocate a new server */
2139
mc.server = avahi_server_new(avahi_simple_poll_get
2140
(mc.simple_poll), &config, NULL,
2141
NULL, &error);
2467
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2468
&config, NULL, NULL, &ret_errno);
2142
2469
2143
2470
/* Free the Avahi configuration data */
2144
2471
avahi_server_config_free(&config);
2146
2473
2147
2474
/* Check if creating the Avahi server object succeeded */
2148
2475
if(mc.server == NULL){
2149
fprintf(stderr, "Mandos plugin mandos-client: "
2150
"Failed to create Avahi server: %s\n",
2151
avahi_strerror(error));
2476
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2477
avahi_strerror(ret_errno));
2152
2478
exitcode = EX_UNAVAILABLE;
2153
2479
goto end;
2154
2480
}
2160
2486
/* Create the Avahi service browser */
2161
2487
sb = avahi_s_service_browser_new(mc.server, if_index,
2162
2488
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2163
NULL, 0, browse_callback, NULL);
2489
NULL, 0, browse_callback,
2490
(void *)&mc);
2164
2491
if(sb == NULL){
2165
fprintf(stderr, "Mandos plugin mandos-client: "
2166
"Failed to create service browser: %s\n",
2167
avahi_strerror(avahi_server_errno(mc.server)));
2492
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2493
avahi_strerror(avahi_server_errno(mc.server)));
2168
2494
exitcode = EX_UNAVAILABLE;
2169
2495
goto end;
2170
2496
}
2176
2502
/* Run the main loop */
2177
2503
2178
2504
if(debug){
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"Starting Avahi loop search\n");
2505
fprintf_plus(stderr, "Starting Avahi loop search\n");
2181
2506
}
2182
2183
ret = avahi_loop_with_timeout(mc.simple_poll,
2184
(int)(retry_interval * 1000));
2507
2508
ret = avahi_loop_with_timeout(simple_poll,
2509
(int)(retry_interval * 1000), &mc);
2185
2510
if(debug){
2186
fprintf(stderr, "Mandos plugin mandos-client: "
2187
"avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2511
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2512
(ret == 0) ? "successfully" : "with error");
2189
2513
}
2190
2514
2191
2515
end:
2192
2516
2193
2517
if(debug){
2194
fprintf(stderr, "Mandos plugin mandos-client: "
2195
"%s exiting\n", argv[0]);
2518
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2196
2519
}
2197
2520
2198
2521
/* Cleanup things */
2522
free(mc.interfaces);
2523
2199
2524
if(sb != NULL)
2200
2525
avahi_s_service_browser_free(sb);
2201
2526
2202
2527
if(mc.server != NULL)
2203
2528
avahi_server_free(mc.server);
2204
2529
2205
if(mc.simple_poll != NULL)
2206
avahi_simple_poll_free(mc.simple_poll);
2530
if(simple_poll != NULL)
2531
avahi_simple_poll_free(simple_poll);
2207
2532
2208
2533
if(gnutls_initialized){
2209
2534
gnutls_certificate_free_credentials(mc.cred);
2214
2539
if(gpgme_initialized){
2215
2540
gpgme_release(mc.ctx);
2216
2541
}
2217
2542
2218
2543
/* Cleans up the circular linked list of Mandos servers the client
2219
2544
has seen */
2220
2545
if(mc.current_server != NULL){
2226
2551
}
2227
2552
}
2228
2553
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");
2554
/* Re-raise privileges */
2555
{
2556
ret_errno = raise_privileges();
2557
if(ret_errno != 0){
2558
errno = ret_errno;
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
}
2238
2583
}
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
}
2584
2585
ret_errno = lower_privileges_permanently();
2586
if(ret_errno != 0){
2587
errno = ret_errno;
2588
perror_plus("Failed to lower privileges permanently");
2260
2589
}
2261
2590
}
2262
2591
2592
free(interfaces_to_take_down);
2593
free(interfaces_hooks);
2594
2263
2595
/* Removes the GPGME temp directory and all files inside */
2264
if(tempdir_created){
2596
if(tempdir != NULL){
2265
2597
struct dirent **direntries = NULL;
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);
2598
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2599
O_NOFOLLOW));
2600
if(tempdir_fd == -1){
2601
perror_plus("open");
2602
} else {
2603
#ifdef __GLIBC__
2604
#if __GLIBC_PREREQ(2, 15)
2605
int numentries = scandirat(tempdir_fd, ".", &direntries,
2606
notdotentries, alphasort);
2607
#else /* not __GLIBC_PREREQ(2, 15) */
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
2609
alphasort);
2610
#endif /* not __GLIBC_PREREQ(2, 15) */
2611
#else /* not __GLIBC__ */
2612
int numentries = scandir(tempdir, &direntries, notdotentries,
2613
alphasort);
2614
#endif /* not __GLIBC__ */
2615
if(numentries >= 0){
2616
for(int i = 0; i < numentries; i++){
2617
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2618
if(ret == -1){
2619
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2620
" \"%s\", 0): %s\n", tempdir,
2621
direntries[i]->d_name, strerror(errno));
2622
}
2623
}
2624
2625
/* need to clean even if 0 because man page doesn't specify */
2626
free(direntries);
2627
if(numentries == -1){
2628
perror_plus("scandir");
2629
}
2630
ret = rmdir(tempdir);
2631
if(ret == -1 and errno != ENOENT){
2632
perror_plus("rmdir");
2633
}
2285
2634
}
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
TEMP_FAILURE_RETRY(close(tempdir_fd));
2296
2636
}
2297
2637
}
2298
2638
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0