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- Committer: Teddy Hogeborn
- Date: 2015-07-09 20:32:52 UTC
- Revision ID: teddy@recompile.se-20150709203252-u10p7trfsxc1a9yp
Install client Diffie-Hellman parameters into initramfs.
* debian/control (Package: mandos-client/Recommends): Added
"gnutls-bin | openssl" (to generate DH parameters).
* debian/mandos-client.postinst (create_dh_params): New function
called on package
configure.
* plugins.d/mandos-client.c (main): Bug fix: Work around Debian bug
#633582 also for the
"client-dhparams.pem" file.
* debian/control (Package: mandos-client/Recommends): Added
"gnutls-bin | openssl" (to generate DH parameters).
* debian/mandos-client.postinst (create_dh_params): New function
called on package
configure.
* plugins.d/mandos-client.c (main): Bug fix: Work around Debian bug
#633582 also for the
"client-dhparams.pem" file.
- files added:
- debian/mandos-client.examples
- debian/upstream
- network-hooks.d
- plugin-helpers
- 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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 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
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
211
253
}
212
254
/* Special case of first server */
213
if (mc.current_server == NULL){
255
if(*current_server == NULL){
214
256
new_server->next = new_server;
215
257
new_server->prev = new_server;
216
mc.current_server = new_server;
217
/* Place the new server last in the list */
258
*current_server = new_server;
218
259
} else {
219
new_server->next = mc.current_server;
220
new_server->prev = mc.current_server->prev;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
221
263
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;
264
(*current_server)->prev = new_server;
265
}
266
return true;
230
267
}
231
268
232
269
/*
233
270
* Initialize GPGME.
234
271
*/
235
static bool init_gpgme(const char *seckey,
236
const char *pubkey, const char *tempdir){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
237
277
gpgme_error_t rc;
238
278
gpgme_engine_info_t engine_info;
239
279
240
241
280
/*
242
281
* Helper function to insert pub and seckey to the engine keyring.
243
282
*/
244
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
245
284
int ret;
246
285
int fd;
247
286
gpgme_data_t pgp_data;
254
293
255
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
256
295
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));
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
260
298
return false;
261
299
}
262
300
263
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
264
302
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));
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
268
305
return false;
269
306
}
270
307
277
314
}
278
315
279
316
if(debug){
280
fprintf(stderr, "Mandos plugin mandos-client: "
281
"Initializing GPGME\n");
317
fprintf_plus(stderr, "Initializing GPGME\n");
282
318
}
283
319
284
320
/* Init GPGME */
285
321
gpgme_check_version(NULL);
286
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
287
323
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));
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
291
326
return false;
292
327
}
293
328
294
329
/* Set GPGME home directory for the OpenPGP engine only */
295
330
rc = gpgme_get_engine_info(&engine_info);
296
331
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));
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
300
334
return false;
301
335
}
302
336
while(engine_info != NULL){
308
342
engine_info = engine_info->next;
309
343
}
310
344
if(engine_info == NULL){
311
fprintf(stderr, "Mandos plugin mandos-client: "
312
"Could not set GPGME home dir to %s\n", tempdir);
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
313
347
return false;
314
348
}
315
349
316
350
/* Create new GPGME "context" */
317
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
318
352
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));
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
322
356
return false;
323
357
}
324
358
333
367
* Decrypt OpenPGP data.
334
368
* Returns -1 on error
335
369
*/
370
__attribute__((nonnull, warn_unused_result))
336
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
337
372
size_t crypto_size,
338
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
339
375
gpgme_data_t dh_crypto, dh_plain;
340
376
gpgme_error_t rc;
341
377
ssize_t ret;
343
379
ssize_t plaintext_length = 0;
344
380
345
381
if(debug){
346
fprintf(stderr, "Mandos plugin mandos-client: "
347
"Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
348
383
}
349
384
350
385
/* Create new GPGME data buffer from memory cryptotext */
351
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
352
387
0);
353
388
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));
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
357
391
return -1;
358
392
}
359
393
360
394
/* Create new empty GPGME data buffer for the plaintext */
361
395
rc = gpgme_data_new(&dh_plain);
362
396
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));
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
366
400
gpgme_data_release(dh_crypto);
367
401
return -1;
368
402
}
369
403
370
404
/* Decrypt data from the cryptotext data buffer to the plaintext
371
405
data buffer */
372
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
373
407
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));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
377
410
plaintext_length = -1;
378
411
if(debug){
379
412
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
381
414
if(result == NULL){
382
fprintf(stderr, "Mandos plugin mandos-client: "
383
"gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
384
416
} 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);
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
391
421
if(result->file_name != NULL){
392
fprintf(stderr, "Mandos plugin mandos-client: "
393
"File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
394
423
}
395
424
gpgme_recipient_t recipient;
396
425
recipient = result->recipients;
397
426
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");
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
407
434
recipient = recipient->next;
408
435
}
409
436
}
412
439
}
413
440
414
441
if(debug){
415
fprintf(stderr, "Mandos plugin mandos-client: "
416
"Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
417
443
}
418
444
419
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
426
452
*plaintext = NULL;
427
453
while(true){
428
454
plaintext_capacity = incbuffer(plaintext,
429
(size_t)plaintext_length,
430
plaintext_capacity);
455
(size_t)plaintext_length,
456
plaintext_capacity);
431
457
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
435
461
}
436
462
437
463
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
450
476
}
451
477
452
478
if(debug){
453
fprintf(stderr, "Mandos plugin mandos-client: "
454
"Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
455
480
for(ssize_t i = 0; i < plaintext_length; i++){
456
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
457
482
}
468
493
return plaintext_length;
469
494
}
470
495
471
static const char * safer_gnutls_strerror(int value){
472
const char *ret = gnutls_strerror(value); /* Spurious warning from
473
-Wunreachable-code */
474
if(ret == NULL)
475
ret = "(unknown)";
476
return ret;
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
477
507
}
478
508
479
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
480
511
static void debuggnutls(__attribute__((unused)) int level,
481
512
const char* string){
482
fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);
513
fprintf_plus(stderr, "GnuTLS: %s", string);
483
514
}
484
515
516
__attribute__((nonnull, warn_unused_result))
485
517
static int init_gnutls_global(const char *pubkeyfilename,
486
const char *seckeyfilename){
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
487
521
int ret;
522
unsigned int uret;
488
523
489
524
if(debug){
490
fprintf(stderr, "Mandos plugin mandos-client: "
491
"Initializing GnuTLS\n");
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
492
526
}
493
527
494
528
ret = gnutls_global_init();
495
529
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "Mandos plugin mandos-client: "
497
"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
530
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
531
safer_gnutls_strerror(ret));
498
532
return -1;
499
533
}
500
534
507
541
}
508
542
509
543
/* OpenPGP credentials */
510
ret = gnutls_certificate_allocate_credentials(&mc.cred);
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
511
545
if(ret != GNUTLS_E_SUCCESS){
512
fprintf(stderr, "Mandos plugin mandos-client: "
513
"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
safer_gnutls_strerror(ret));
514
548
gnutls_global_deinit();
515
549
return -1;
516
550
}
517
551
518
552
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);
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
555
pubkeyfilename,
556
seckeyfilename);
523
557
}
524
558
525
559
ret = gnutls_certificate_set_openpgp_key_file
526
(mc.cred, pubkeyfilename, seckeyfilename,
560
(mc->cred, pubkeyfilename, seckeyfilename,
527
561
GNUTLS_OPENPGP_FMT_BASE64);
528
562
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));
563
fprintf_plus(stderr,
564
"Error[%d] while reading the OpenPGP key pair ('%s',"
565
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
566
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
567
safer_gnutls_strerror(ret));
535
568
goto globalfail;
536
569
}
537
570
538
571
/* GnuTLS server initialization */
539
ret = gnutls_dh_params_init(&mc.dh_params);
540
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));
544
goto globalfail;
545
}
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
547
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));
551
goto globalfail;
552
}
553
554
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
572
ret = gnutls_dh_params_init(&mc->dh_params);
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
" initialization: %s\n",
576
safer_gnutls_strerror(ret));
577
goto globalfail;
578
}
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
if(params.data == NULL){
619
dhparamsfilename = NULL;
620
}
621
if(dhparamsfilename == NULL){
622
break;
623
}
624
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
625
GNUTLS_X509_FMT_PEM);
626
if(ret != GNUTLS_E_SUCCESS){
627
fprintf_plus(stderr, "Failed to parse DH parameters in file"
628
" \"%s\": %s\n", dhparamsfilename,
629
safer_gnutls_strerror(ret));
630
dhparamsfilename = NULL;
631
}
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
555
752
556
753
return 0;
557
754
558
755
globalfail:
559
756
560
gnutls_certificate_free_credentials(mc.cred);
757
gnutls_certificate_free_credentials(mc->cred);
561
758
gnutls_global_deinit();
562
gnutls_dh_params_deinit(mc.dh_params);
759
gnutls_dh_params_deinit(mc->dh_params);
563
760
return -1;
564
761
}
565
762
566
static int init_gnutls_session(gnutls_session_t *session){
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
765
mandos_context *mc){
567
766
int ret;
568
767
/* GnuTLS session creation */
569
768
do {
573
772
}
574
773
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
575
774
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));
775
fprintf_plus(stderr,
776
"Error in GnuTLS session initialization: %s\n",
777
safer_gnutls_strerror(ret));
579
778
}
580
779
581
780
{
582
781
const char *err;
583
782
do {
584
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
585
784
if(quit_now){
586
785
gnutls_deinit(*session);
587
786
return -1;
588
787
}
589
788
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
590
789
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));
790
fprintf_plus(stderr, "Syntax error at: %s\n", err);
791
fprintf_plus(stderr, "GnuTLS error: %s\n",
792
safer_gnutls_strerror(ret));
595
793
gnutls_deinit(*session);
596
794
return -1;
597
795
}
599
797
600
798
do {
601
799
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
602
mc.cred);
800
mc->cred);
603
801
if(quit_now){
604
802
gnutls_deinit(*session);
605
803
return -1;
606
804
}
607
805
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
608
806
if(ret != GNUTLS_E_SUCCESS){
609
fprintf(stderr, "Mandos plugin mandos-client: "
610
"Error setting GnuTLS credentials: %s\n",
611
safer_gnutls_strerror(ret));
807
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
808
safer_gnutls_strerror(ret));
612
809
gnutls_deinit(*session);
613
810
return -1;
614
811
}
616
813
/* ignore client certificate if any. */
617
814
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
618
815
619
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
620
621
816
return 0;
622
817
}
623
818
625
820
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
626
821
__attribute__((unused)) const char *txt){}
627
822
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
829
ret_errno = errno;
830
}
831
errno = old_errno;
832
return ret_errno;
833
}
834
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
841
errno = old_errno;
842
return ret_errno;
843
}
844
if(setuid(0) == -1){
845
ret_errno = errno;
846
}
847
errno = old_errno;
848
return ret_errno;
849
}
850
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
857
ret_errno = errno;
858
}
859
errno = old_errno;
860
return ret_errno;
861
}
862
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
869
ret_errno = errno;
870
}
871
errno = old_errno;
872
return ret_errno;
873
}
874
875
/* Helper function to add_local_route() and delete_local_route() */
876
__attribute__((nonnull, warn_unused_result))
877
static bool add_delete_local_route(const bool add,
878
const char *address,
879
AvahiIfIndex if_index){
880
int ret;
881
char helper[] = "mandos-client-iprouteadddel";
882
char add_arg[] = "add";
883
char delete_arg[] = "delete";
884
char debug_flag[] = "--debug";
885
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
886
if(pluginhelperdir == NULL){
887
if(debug){
888
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
889
" variable not set; cannot run helper\n");
890
}
891
return false;
892
}
893
894
char interface[IF_NAMESIZE];
895
if(if_indextoname((unsigned int)if_index, interface) == NULL){
896
perror_plus("if_indextoname");
897
return false;
898
}
899
900
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
901
if(devnull == -1){
902
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
return false;
904
}
905
pid_t pid = fork();
906
if(pid == 0){
907
/* Child */
908
/* Raise privileges */
909
errno = raise_privileges_permanently();
910
if(errno != 0){
911
perror_plus("Failed to raise privileges");
912
/* _exit(EX_NOPERM); */
913
} else {
914
/* Set group */
915
errno = 0;
916
ret = setgid(0);
917
if(ret == -1){
918
perror_plus("setgid");
919
_exit(EX_NOPERM);
920
}
921
/* Reset supplementary groups */
922
errno = 0;
923
ret = setgroups(0, NULL);
924
if(ret == -1){
925
perror_plus("setgroups");
926
_exit(EX_NOPERM);
927
}
928
}
929
ret = dup2(devnull, STDIN_FILENO);
930
if(ret == -1){
931
perror_plus("dup2(devnull, STDIN_FILENO)");
932
_exit(EX_OSERR);
933
}
934
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
935
if(ret == -1){
936
perror_plus("close");
937
_exit(EX_OSERR);
938
}
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
940
if(ret == -1){
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
942
_exit(EX_OSERR);
943
}
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
945
O_RDONLY
946
| O_DIRECTORY
947
| O_PATH
948
| O_CLOEXEC));
949
if(helperdir_fd == -1){
950
perror_plus("open");
951
_exit(EX_UNAVAILABLE);
952
}
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
954
helper, O_RDONLY));
955
if(helper_fd == -1){
956
perror_plus("openat");
957
_exit(EX_UNAVAILABLE);
958
}
959
TEMP_FAILURE_RETRY(close(helperdir_fd));
960
#ifdef __GNUC__
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
963
#endif
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
967
environ) == -1){
968
#ifdef __GNUC__
969
#pragma GCC diagnostic pop
970
#endif
971
perror_plus("fexecve");
972
_exit(EXIT_FAILURE);
973
}
974
}
975
if(pid == -1){
976
perror_plus("fork");
977
return false;
978
}
979
int status;
980
pid_t pret = -1;
981
errno = 0;
982
do {
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
990
}
991
if(kill(pid, SIGTERM) == -1){
992
perror_plus("kill");
993
}
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
996
" helper program");
997
}
998
return false;
999
}
1000
} while(pret == -1 and errno == EINTR);
1001
if(pret == -1){
1002
perror_plus("waitpid");
1003
return false;
1004
}
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1009
return false;
1010
}
1011
return true;
1012
}
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1016
return false;
1017
}
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1019
return false;
1020
}
1021
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1025
if(debug){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1027
}
1028
return add_delete_local_route(true, address, if_index);
1029
}
1030
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1034
if(debug){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1036
}
1037
return add_delete_local_route(false, address, if_index);
1038
}
1039
628
1040
/* Called when a Mandos server is found */
629
static int start_mandos_communication(const char *ip, uint16_t port,
1041
__attribute__((nonnull, warn_unused_result))
1042
static int start_mandos_communication(const char *ip, in_port_t port,
630
1043
AvahiIfIndex if_index,
631
int af){
1044
int af, mandos_context *mc){
632
1045
int ret, tcp_sd = -1;
633
1046
ssize_t sret;
634
union {
635
struct sockaddr_in in;
636
struct sockaddr_in6 in6;
637
} to;
1047
struct sockaddr_storage to;
638
1048
char *buffer = NULL;
639
1049
char *decrypted_buffer = NULL;
640
1050
size_t buffer_length = 0;
643
1053
int retval = -1;
644
1054
gnutls_session_t session;
645
1055
int pf; /* Protocol family */
1056
bool route_added = false;
646
1057
647
1058
errno = 0;
648
1059
659
1070
pf = PF_INET;
660
1071
break;
661
1072
default:
662
fprintf(stderr, "Mandos plugin mandos-client: "
663
"Bad address family: %d\n", af);
1073
fprintf_plus(stderr, "Bad address family: %d\n", af);
664
1074
errno = EINVAL;
665
1075
return -1;
666
1076
}
667
1077
668
ret = init_gnutls_session(&session);
1078
/* If the interface is specified and we have a list of interfaces */
1079
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1080
/* Check if the interface is one of the interfaces we are using */
1081
bool match = false;
1082
{
1083
char *interface = NULL;
1084
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1085
interface))){
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
1087
match = true;
1088
break;
1089
}
1090
}
1091
}
1092
if(not match){
1093
/* This interface does not match any in the list, so we don't
1094
connect to the server */
1095
if(debug){
1096
char interface[IF_NAMESIZE];
1097
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1098
perror_plus("if_indextoname");
1099
} else {
1100
fprintf_plus(stderr, "Skipping server on non-used interface"
1101
" \"%s\"\n",
1102
if_indextoname((unsigned int)if_index,
1103
interface));
1104
}
1105
}
1106
return -1;
1107
}
1108
}
1109
1110
ret = init_gnutls_session(&session, mc);
669
1111
if(ret != 0){
670
1112
return -1;
671
1113
}
672
1114
673
1115
if(debug){
674
fprintf(stderr, "Mandos plugin mandos-client: "
675
"Setting up a TCP connection to %s, port %" PRIu16
676
"\n", ip, port);
1116
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1117
PRIuMAX "\n", ip, (uintmax_t)port);
677
1118
}
678
1119
679
tcp_sd = socket(pf, SOCK_STREAM, 0);
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
680
1121
if(tcp_sd < 0){
681
1122
int e = errno;
682
1123
perror_plus("socket");
691
1132
692
1133
memset(&to, 0, sizeof(to));
693
1134
if(af == AF_INET6){
694
to.in6.sin6_family = (sa_family_t)af;
695
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1135
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1136
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
696
1137
} else { /* IPv4 */
697
to.in.sin_family = (sa_family_t)af;
698
ret = inet_pton(af, ip, &to.in.sin_addr);
1138
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1139
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
699
1140
}
700
1141
if(ret < 0 ){
701
1142
int e = errno;
705
1146
}
706
1147
if(ret == 0){
707
1148
int e = errno;
708
fprintf(stderr, "Mandos plugin mandos-client: "
709
"Bad address: %s\n", ip);
1149
fprintf_plus(stderr, "Bad address: %s\n", ip);
710
1150
errno = e;
711
1151
goto mandos_end;
712
1152
}
713
1153
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*/
1154
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1155
if(IN6_IS_ADDR_LINKLOCAL
1156
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
721
1157
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");
1158
fprintf_plus(stderr, "An IPv6 link-local address is"
1159
" incomplete without a network interface\n");
725
1160
errno = EINVAL;
726
1161
goto mandos_end;
727
1162
}
728
1163
/* Set the network interface number as scope */
729
to.in6.sin6_scope_id = (uint32_t)if_index;
1164
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
730
1165
}
731
1166
} else {
732
to.in.sin_port = htons(port); /* Spurious warnings from
733
-Wconversion and
734
-Wunreachable-code */
1167
((struct sockaddr_in *)&to)->sin_port = htons(port);
735
1168
}
736
1169
737
1170
if(quit_now){
745
1178
if(if_indextoname((unsigned int)if_index, interface) == NULL){
746
1179
perror_plus("if_indextoname");
747
1180
} else {
748
fprintf(stderr, "Mandos plugin mandos-client: "
749
"Connection to: %s%%%s, port %" PRIu16 "\n",
750
ip, interface, port);
1181
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1182
"\n", ip, interface, (uintmax_t)port);
751
1183
}
752
1184
} else {
753
fprintf(stderr, "Mandos plugin mandos-client: "
754
"Connection to: %s, port %" PRIu16 "\n", ip, port);
1185
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1186
ip, (uintmax_t)port);
755
1187
}
756
1188
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
757
1189
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
758
const char *pcret;
759
if(af == AF_INET6){
760
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
761
sizeof(addrstr));
762
} else {
763
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
764
sizeof(addrstr));
765
}
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
}
773
}
774
}
775
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
779
}
780
781
if(af == AF_INET6){
782
ret = connect(tcp_sd, &to.in6, sizeof(to));
783
} else {
784
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
785
}
786
if(ret < 0){
787
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
788
int e = errno;
789
perror_plus("connect");
790
errno = e;
791
}
792
goto mandos_end;
793
}
794
795
if(quit_now){
796
errno = EINTR;
797
goto mandos_end;
1190
if(af == AF_INET6){
1191
ret = getnameinfo((struct sockaddr *)&to,
1192
sizeof(struct sockaddr_in6),
1193
addrstr, sizeof(addrstr), NULL, 0,
1194
NI_NUMERICHOST);
1195
} else {
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in),
1198
addrstr, sizeof(addrstr), NULL, 0,
1199
NI_NUMERICHOST);
1200
}
1201
if(ret == EAI_SYSTEM){
1202
perror_plus("getnameinfo");
1203
} else if(ret != 0) {
1204
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1205
} else if(strcmp(addrstr, ip) != 0){
1206
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1207
}
1208
}
1209
1210
if(quit_now){
1211
errno = EINTR;
1212
goto mandos_end;
1213
}
1214
1215
while(true){
1216
if(af == AF_INET6){
1217
ret = connect(tcp_sd, (struct sockaddr *)&to,
1218
sizeof(struct sockaddr_in6));
1219
} else {
1220
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1221
sizeof(struct sockaddr_in));
1222
}
1223
if(ret < 0){
1224
if(errno == ENETUNREACH
1225
and if_index != AVAHI_IF_UNSPEC
1226
and connect_to == NULL
1227
and not route_added and
1228
((af == AF_INET6 and not
1229
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1230
&to)->sin6_addr)))
1231
or (af == AF_INET and
1232
/* Not a a IPv4LL address */
1233
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1234
& 0xFFFF0000L) != 0xA9FE0000L))){
1235
/* Work around Avahi bug - Avahi does not announce link-local
1236
addresses if it has a global address, so local hosts with
1237
*only* a link-local address (e.g. Mandos clients) cannot
1238
connect to a Mandos server announced by Avahi on a server
1239
host with a global address. Work around this by retrying
1240
with an explicit route added with the server's address.
1241
1242
Avahi bug reference:
1243
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://bugs.debian.org/587961
1245
*/
1246
if(debug){
1247
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
" direct route\n");
1249
}
1250
int e = errno;
1251
route_added = add_local_route(ip, if_index);
1252
if(route_added){
1253
continue;
1254
}
1255
errno = e;
1256
}
1257
if(errno != ECONNREFUSED or debug){
1258
int e = errno;
1259
perror_plus("connect");
1260
errno = e;
1261
}
1262
goto mandos_end;
1263
}
1264
1265
if(quit_now){
1266
errno = EINTR;
1267
goto mandos_end;
1268
}
1269
break;
798
1270
}
799
1271
800
1272
const char *out = mandos_protocol_version;
802
1274
while(true){
803
1275
size_t out_size = strlen(out);
804
1276
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
805
out_size - written));
1277
out_size - written));
806
1278
if(ret == -1){
807
1279
int e = errno;
808
1280
perror_plus("write");
828
1300
}
829
1301
830
1302
if(debug){
831
fprintf(stderr, "Mandos plugin mandos-client: "
832
"Establishing TLS session with %s\n", ip);
1303
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
833
1304
}
834
1305
835
1306
if(quit_now){
837
1308
goto mandos_end;
838
1309
}
839
1310
840
/* Spurious warning from -Wint-to-pointer-cast */
841
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1311
/* This casting via intptr_t is to eliminate warning about casting
1312
an int to a pointer type. This is exactly how the GnuTLS Guile
1313
function "set-session-transport-fd!" does it. */
1314
gnutls_transport_set_ptr(session,
1315
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
842
1316
843
1317
if(quit_now){
844
1318
errno = EINTR;
855
1329
856
1330
if(ret != GNUTLS_E_SUCCESS){
857
1331
if(debug){
858
fprintf(stderr, "Mandos plugin mandos-client: "
859
"*** GnuTLS Handshake failed ***\n");
1332
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
860
1333
gnutls_perror(ret);
861
1334
}
862
1335
errno = EPROTO;
866
1339
/* Read OpenPGP packet that contains the wanted password */
867
1340
868
1341
if(debug){
869
fprintf(stderr, "Mandos plugin mandos-client: "
870
"Retrieving OpenPGP encrypted password from %s\n", ip);
1342
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1343
" %s\n", ip);
871
1344
}
872
1345
873
1346
while(true){
878
1351
}
879
1352
880
1353
buffer_capacity = incbuffer(&buffer, buffer_length,
881
buffer_capacity);
1354
buffer_capacity);
882
1355
if(buffer_capacity == 0){
883
1356
int e = errno;
884
1357
perror_plus("incbuffer");
911
1384
}
912
1385
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
913
1386
if(ret < 0){
914
fprintf(stderr, "Mandos plugin mandos-client: "
915
"*** GnuTLS Re-handshake failed ***\n");
1387
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1388
"***\n");
916
1389
gnutls_perror(ret);
917
1390
errno = EPROTO;
918
1391
goto mandos_end;
919
1392
}
920
1393
break;
921
1394
default:
922
fprintf(stderr, "Mandos plugin mandos-client: "
923
"Unknown error while reading data from"
924
" encrypted session with Mandos server\n");
1395
fprintf_plus(stderr, "Unknown error while reading data from"
1396
" encrypted session with Mandos server\n");
925
1397
gnutls_bye(session, GNUTLS_SHUT_RDWR);
926
1398
errno = EIO;
927
1399
goto mandos_end;
932
1404
}
933
1405
934
1406
if(debug){
935
fprintf(stderr, "Mandos plugin mandos-client: "
936
"Closing TLS session\n");
1407
fprintf_plus(stderr, "Closing TLS session\n");
937
1408
}
938
1409
939
1410
if(quit_now){
951
1422
952
1423
if(buffer_length > 0){
953
1424
ssize_t decrypted_buffer_size;
954
decrypted_buffer_size = pgp_packet_decrypt(buffer,
955
buffer_length,
956
&decrypted_buffer);
1425
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1426
&decrypted_buffer, mc);
957
1427
if(decrypted_buffer_size >= 0){
958
1428
959
1429
written = 0;
969
1439
if(ret == 0 and ferror(stdout)){
970
1440
int e = errno;
971
1441
if(debug){
972
fprintf(stderr, "Mandos plugin mandos-client: "
973
"Error writing encrypted data: %s\n",
974
strerror(errno));
1442
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1443
strerror(errno));
975
1444
}
976
1445
errno = e;
977
1446
goto mandos_end;
986
1455
987
1456
mandos_end:
988
1457
{
1458
if(route_added){
1459
if(not delete_local_route(ip, if_index)){
1460
fprintf_plus(stderr, "Failed to delete local route to %s on"
1461
" interface %d", ip, if_index);
1462
}
1463
}
989
1464
int e = errno;
990
1465
free(decrypted_buffer);
991
1466
free(buffer);
1008
1483
return retval;
1009
1484
}
1010
1485
1486
__attribute__((nonnull))
1011
1487
static void resolve_callback(AvahiSServiceResolver *r,
1012
1488
AvahiIfIndex interface,
1013
1489
AvahiProtocol proto,
1021
1497
AVAHI_GCC_UNUSED AvahiStringList *txt,
1022
1498
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1023
1499
flags,
1024
AVAHI_GCC_UNUSED void* userdata){
1025
assert(r);
1500
void *mc){
1501
if(r == NULL){
1502
return;
1503
}
1026
1504
1027
1505
/* Called whenever a service has been resolved successfully or
1028
1506
timed out */
1029
1507
1030
1508
if(quit_now){
1509
avahi_s_service_resolver_free(r);
1031
1510
return;
1032
1511
}
1033
1512
1034
1513
switch(event){
1035
1514
default:
1036
1515
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)));
1516
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1517
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1518
domain,
1519
avahi_strerror(avahi_server_errno
1520
(((mandos_context*)mc)->server)));
1041
1521
break;
1042
1522
1043
1523
case AVAHI_RESOLVER_FOUND:
1045
1525
char ip[AVAHI_ADDRESS_STR_MAX];
1046
1526
avahi_address_snprint(ip, sizeof(ip), address);
1047
1527
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);
1528
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1529
PRIdMAX ") on port %" PRIu16 "\n", name,
1530
host_name, ip, (intmax_t)interface, port);
1052
1531
}
1053
int ret = start_mandos_communication(ip, port, interface,
1054
avahi_proto_to_af(proto));
1532
int ret = start_mandos_communication(ip, (in_port_t)port,
1533
interface,
1534
avahi_proto_to_af(proto),
1535
mc);
1055
1536
if(ret == 0){
1056
avahi_simple_poll_quit(mc.simple_poll);
1537
avahi_simple_poll_quit(simple_poll);
1057
1538
} else {
1058
ret = add_server(ip, port, interface,
1059
avahi_proto_to_af(proto));
1539
if(not add_server(ip, (in_port_t)port, interface,
1540
avahi_proto_to_af(proto),
1541
&((mandos_context*)mc)->current_server)){
1542
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1543
" list\n", name);
1544
}
1060
1545
}
1061
1546
}
1062
1547
}
1072
1557
const char *domain,
1073
1558
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1074
1559
flags,
1075
AVAHI_GCC_UNUSED void* userdata){
1076
assert(b);
1560
void *mc){
1561
if(b == NULL){
1562
return;
1563
}
1077
1564
1078
1565
/* Called whenever a new services becomes available on the LAN or
1079
1566
is removed from the LAN */
1086
1573
default:
1087
1574
case AVAHI_BROWSER_FAILURE:
1088
1575
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);
1576
fprintf_plus(stderr, "(Avahi browser) %s\n",
1577
avahi_strerror(avahi_server_errno
1578
(((mandos_context*)mc)->server)));
1579
avahi_simple_poll_quit(simple_poll);
1093
1580
return;
1094
1581
1095
1582
case AVAHI_BROWSER_NEW:
1098
1585
the callback function is called the Avahi server will free the
1099
1586
resolver for us. */
1100
1587
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)));
1588
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1589
interface, protocol, name, type,
1590
domain, protocol, 0,
1591
resolve_callback, mc) == NULL)
1592
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1593
" %s\n", name,
1594
avahi_strerror(avahi_server_errno
1595
(((mandos_context*)mc)->server)));
1107
1596
break;
1108
1597
1109
1598
case AVAHI_BROWSER_REMOVE:
1112
1601
case AVAHI_BROWSER_ALL_FOR_NOW:
1113
1602
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1114
1603
if(debug){
1115
fprintf(stderr, "Mandos plugin mandos-client: "
1116
"No Mandos server found, still searching...\n");
1604
fprintf_plus(stderr, "No Mandos server found, still"
1605
" searching...\n");
1117
1606
}
1118
1607
break;
1119
1608
}
1128
1617
signal_received = sig;
1129
1618
int old_errno = errno;
1130
1619
/* set main loop to exit */
1131
if(mc.simple_poll != NULL){
1132
avahi_simple_poll_quit(mc.simple_poll);
1620
if(simple_poll != NULL){
1621
avahi_simple_poll_quit(simple_poll);
1133
1622
}
1134
1623
errno = old_errno;
1135
1624
}
1136
1625
1626
__attribute__((nonnull, warn_unused_result))
1137
1627
bool get_flags(const char *ifname, struct ifreq *ifr){
1138
1628
int ret;
1629
error_t ret_errno;
1139
1630
1140
1631
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1141
1632
if(s < 0){
1633
ret_errno = errno;
1142
1634
perror_plus("socket");
1635
errno = ret_errno;
1143
1636
return false;
1144
1637
}
1145
1638
strcpy(ifr->ifr_name, ifname);
1146
1639
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1147
1640
if(ret == -1){
1148
1641
if(debug){
1642
ret_errno = errno;
1149
1643
perror_plus("ioctl SIOCGIFFLAGS");
1644
errno = ret_errno;
1150
1645
}
1151
1646
return false;
1152
1647
}
1153
1648
return true;
1154
1649
}
1155
1650
1651
__attribute__((nonnull, warn_unused_result))
1156
1652
bool good_flags(const char *ifname, const struct ifreq *ifr){
1157
1653
1158
1654
/* Reject the loopback device */
1159
1655
if(ifr->ifr_flags & IFF_LOOPBACK){
1160
1656
if(debug){
1161
fprintf(stderr, "Mandos plugin mandos-client: "
1162
"Rejecting loopback interface \"%s\"\n", ifname);
1657
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1658
ifname);
1163
1659
}
1164
1660
return false;
1165
1661
}
1166
1662
/* Accept point-to-point devices only if connect_to is specified */
1167
1663
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1168
1664
if(debug){
1169
fprintf(stderr, "Mandos plugin mandos-client: "
1170
"Accepting point-to-point interface \"%s\"\n", ifname);
1665
fprintf_plus(stderr, "Accepting point-to-point interface"
1666
" \"%s\"\n", ifname);
1171
1667
}
1172
1668
return true;
1173
1669
}
1174
1670
/* Otherwise, reject non-broadcast-capable devices */
1175
1671
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1176
1672
if(debug){
1177
fprintf(stderr, "Mandos plugin mandos-client: "
1178
"Rejecting non-broadcast interface \"%s\"\n", ifname);
1673
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1674
" \"%s\"\n", ifname);
1179
1675
}
1180
1676
return false;
1181
1677
}
1182
1678
/* Reject non-ARP interfaces (including dummy interfaces) */
1183
1679
if(ifr->ifr_flags & IFF_NOARP){
1184
1680
if(debug){
1185
fprintf(stderr, "Mandos plugin mandos-client: "
1186
"Rejecting non-ARP interface \"%s\"\n", ifname);
1681
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1682
ifname);
1187
1683
}
1188
1684
return false;
1189
1685
}
1190
1686
1191
1687
/* Accept this device */
1192
1688
if(debug){
1193
fprintf(stderr, "Mandos plugin mandos-client: "
1194
"Interface \"%s\" is good\n", ifname);
1689
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1195
1690
}
1196
1691
return true;
1197
1692
}
1201
1696
* corresponds to an acceptable network device.
1202
1697
* (This function is passed to scandir(3) as a filter function.)
1203
1698
*/
1699
__attribute__((nonnull, warn_unused_result))
1204
1700
int good_interface(const struct dirent *if_entry){
1205
1701
if(if_entry->d_name[0] == '.'){
1206
1702
return 0;
1209
1705
struct ifreq ifr;
1210
1706
if(not get_flags(if_entry->d_name, &ifr)){
1211
1707
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
1708
fprintf_plus(stderr, "Failed to get flags for interface "
1709
"\"%s\"\n", if_entry->d_name);
1710
}
1711
return 0;
1712
}
1713
1714
if(not good_flags(if_entry->d_name, &ifr)){
1715
return 0;
1716
}
1717
return 1;
1718
}
1719
1720
/*
1721
* This function determines if a network interface is up.
1722
*/
1723
__attribute__((nonnull, warn_unused_result))
1724
bool interface_is_up(const char *interface){
1725
struct ifreq ifr;
1726
if(not get_flags(interface, &ifr)){
1727
if(debug){
1728
fprintf_plus(stderr, "Failed to get flags for interface "
1729
"\"%s\"\n", interface);
1730
}
1731
return false;
1732
}
1733
1734
return (bool)(ifr.ifr_flags & IFF_UP);
1735
}
1736
1737
/*
1738
* This function determines if a network interface is running
1739
*/
1740
__attribute__((nonnull, warn_unused_result))
1741
bool interface_is_running(const char *interface){
1742
struct ifreq ifr;
1743
if(not get_flags(interface, &ifr)){
1744
if(debug){
1745
fprintf_plus(stderr, "Failed to get flags for interface "
1746
"\"%s\"\n", interface);
1747
}
1748
return false;
1749
}
1750
1751
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1752
}
1753
1754
__attribute__((nonnull, pure, warn_unused_result))
1271
1755
int notdotentries(const struct dirent *direntry){
1272
1756
/* Skip "." and ".." */
1273
1757
if(direntry->d_name[0] == '.'
1280
1764
}
1281
1765
1282
1766
/* Is this directory entry a runnable program? */
1767
__attribute__((nonnull, warn_unused_result))
1283
1768
int runnable_hook(const struct dirent *direntry){
1284
1769
int ret;
1770
size_t sret;
1285
1771
struct stat st;
1286
1772
1287
1773
if((direntry->d_name)[0] == '\0'){
1289
1775
return 0;
1290
1776
}
1291
1777
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);
1778
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1779
"abcdefghijklmnopqrstuvwxyz"
1780
"0123456789"
1781
"_.-");
1782
if((direntry->d_name)[sret] != '\0'){
1783
/* Contains non-allowed characters */
1784
if(debug){
1785
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1786
direntry->d_name);
1787
}
1788
return 0;
1789
}
1790
1791
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1317
1792
if(ret == -1){
1318
1793
if(debug){
1319
perror_plus("Could not stat plugin");
1794
perror_plus("Could not stat hook");
1320
1795
}
1321
1796
return 0;
1322
1797
}
1323
1798
if(not (S_ISREG(st.st_mode))){
1324
1799
/* Not a regular file */
1800
if(debug){
1801
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1802
direntry->d_name);
1803
}
1325
1804
return 0;
1326
1805
}
1327
1806
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1328
1807
/* Not executable */
1808
if(debug){
1809
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1810
direntry->d_name);
1811
}
1329
1812
return 0;
1330
1813
}
1814
if(debug){
1815
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1816
direntry->d_name);
1817
}
1331
1818
return 1;
1332
1819
}
1333
1820
1334
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1821
__attribute__((nonnull, warn_unused_result))
1822
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1823
mandos_context *mc){
1335
1824
int ret;
1336
1825
struct timespec now;
1337
1826
struct timespec waited_time;
1338
1827
intmax_t block_time;
1339
1828
1340
1829
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");
1830
if(mc->current_server == NULL){
1831
if(debug){
1832
fprintf_plus(stderr, "Wait until first server is found."
1833
" No timeout!\n");
1345
1834
}
1346
1835
ret = avahi_simple_poll_iterate(s, -1);
1347
1836
} else {
1348
if (debug){
1349
fprintf(stderr, "Mandos plugin mandos-client: "
1350
"Check current_server if we should run it,"
1351
" or wait\n");
1837
if(debug){
1838
fprintf_plus(stderr, "Check current_server if we should run"
1839
" it, or wait\n");
1352
1840
}
1353
1841
/* the current time */
1354
1842
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1359
1847
/* Calculating in ms how long time between now and server
1360
1848
who we visted longest time ago. Now - last seen. */
1361
1849
waited_time.tv_sec = (now.tv_sec
1362
- mc.current_server->last_seen.tv_sec);
1850
- mc->current_server->last_seen.tv_sec);
1363
1851
waited_time.tv_nsec = (now.tv_nsec
1364
- mc.current_server->last_seen.tv_nsec);
1852
- mc->current_server->last_seen.tv_nsec);
1365
1853
/* total time is 10s/10,000ms.
1366
1854
Converting to s from ms by dividing by 1,000,
1367
1855
and ns to ms by dividing by 1,000,000. */
1369
1857
- ((intmax_t)waited_time.tv_sec * 1000))
1370
1858
- ((intmax_t)waited_time.tv_nsec / 1000000));
1371
1859
1372
if (debug){
1373
fprintf(stderr, "Mandos plugin mandos-client: "
1374
"Blocking for %" PRIdMAX " ms\n", block_time);
1860
if(debug){
1861
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1862
block_time);
1375
1863
}
1376
1864
1377
1865
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);
1866
ret = start_mandos_communication(mc->current_server->ip,
1867
mc->current_server->port,
1868
mc->current_server->if_index,
1869
mc->current_server->af, mc);
1382
1870
if(ret == 0){
1383
avahi_simple_poll_quit(mc.simple_poll);
1871
avahi_simple_poll_quit(s);
1384
1872
return 0;
1385
1873
}
1386
1874
ret = clock_gettime(CLOCK_MONOTONIC,
1387
&mc.current_server->last_seen);
1875
&mc->current_server->last_seen);
1388
1876
if(ret == -1){
1389
1877
perror_plus("clock_gettime");
1390
1878
return -1;
1391
1879
}
1392
mc.current_server = mc.current_server->next;
1880
mc->current_server = mc->current_server->next;
1393
1881
block_time = 0; /* Call avahi to find new Mandos
1394
1882
servers, but don't block */
1395
1883
}
1397
1885
ret = avahi_simple_poll_iterate(s, (int)block_time);
1398
1886
}
1399
1887
if(ret != 0){
1400
if (ret > 0 or errno != EINTR){
1888
if(ret > 0 or errno != EINTR){
1401
1889
return (ret != 1) ? ret : 0;
1402
1890
}
1403
1891
}
1404
1892
}
1405
1893
}
1406
1894
1895
__attribute__((nonnull))
1896
void run_network_hooks(const char *mode, const char *interface,
1897
const float delay){
1898
struct dirent **direntries = NULL;
1899
if(hookdir_fd == -1){
1900
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1901
| O_CLOEXEC);
1902
if(hookdir_fd == -1){
1903
if(errno == ENOENT){
1904
if(debug){
1905
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1906
" found\n", hookdir);
1907
}
1908
} else {
1909
perror_plus("open");
1910
}
1911
return;
1912
}
1913
}
1914
#ifdef __GLIBC__
1915
#if __GLIBC_PREREQ(2, 15)
1916
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1917
runnable_hook, alphasort);
1918
#else /* not __GLIBC_PREREQ(2, 15) */
1919
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1920
alphasort);
1921
#endif /* not __GLIBC_PREREQ(2, 15) */
1922
#else /* not __GLIBC__ */
1923
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1924
alphasort);
1925
#endif /* not __GLIBC__ */
1926
if(numhooks == -1){
1927
perror_plus("scandir");
1928
return;
1929
}
1930
struct dirent *direntry;
1931
int ret;
1932
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1933
if(devnull == -1){
1934
perror_plus("open(\"/dev/null\", O_RDONLY)");
1935
return;
1936
}
1937
for(int i = 0; i < numhooks; i++){
1938
direntry = direntries[i];
1939
if(debug){
1940
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1941
direntry->d_name);
1942
}
1943
pid_t hook_pid = fork();
1944
if(hook_pid == 0){
1945
/* Child */
1946
/* Raise privileges */
1947
errno = raise_privileges_permanently();
1948
if(errno != 0){
1949
perror_plus("Failed to raise privileges");
1950
_exit(EX_NOPERM);
1951
}
1952
/* Set group */
1953
errno = 0;
1954
ret = setgid(0);
1955
if(ret == -1){
1956
perror_plus("setgid");
1957
_exit(EX_NOPERM);
1958
}
1959
/* Reset supplementary groups */
1960
errno = 0;
1961
ret = setgroups(0, NULL);
1962
if(ret == -1){
1963
perror_plus("setgroups");
1964
_exit(EX_NOPERM);
1965
}
1966
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1967
if(ret == -1){
1968
perror_plus("setenv");
1969
_exit(EX_OSERR);
1970
}
1971
ret = setenv("DEVICE", interface, 1);
1972
if(ret == -1){
1973
perror_plus("setenv");
1974
_exit(EX_OSERR);
1975
}
1976
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1977
if(ret == -1){
1978
perror_plus("setenv");
1979
_exit(EX_OSERR);
1980
}
1981
ret = setenv("MODE", mode, 1);
1982
if(ret == -1){
1983
perror_plus("setenv");
1984
_exit(EX_OSERR);
1985
}
1986
char *delaystring;
1987
ret = asprintf(&delaystring, "%f", (double)delay);
1988
if(ret == -1){
1989
perror_plus("asprintf");
1990
_exit(EX_OSERR);
1991
}
1992
ret = setenv("DELAY", delaystring, 1);
1993
if(ret == -1){
1994
free(delaystring);
1995
perror_plus("setenv");
1996
_exit(EX_OSERR);
1997
}
1998
free(delaystring);
1999
if(connect_to != NULL){
2000
ret = setenv("CONNECT", connect_to, 1);
2001
if(ret == -1){
2002
perror_plus("setenv");
2003
_exit(EX_OSERR);
2004
}
2005
}
2006
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2007
direntry->d_name,
2008
O_RDONLY));
2009
if(hook_fd == -1){
2010
perror_plus("openat");
2011
_exit(EXIT_FAILURE);
2012
}
2013
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2014
perror_plus("close");
2015
_exit(EXIT_FAILURE);
2016
}
2017
ret = dup2(devnull, STDIN_FILENO);
2018
if(ret == -1){
2019
perror_plus("dup2(devnull, STDIN_FILENO)");
2020
_exit(EX_OSERR);
2021
}
2022
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2023
if(ret == -1){
2024
perror_plus("close");
2025
_exit(EX_OSERR);
2026
}
2027
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2028
if(ret == -1){
2029
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2030
_exit(EX_OSERR);
2031
}
2032
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2033
environ) == -1){
2034
perror_plus("fexecve");
2035
_exit(EXIT_FAILURE);
2036
}
2037
} else {
2038
if(hook_pid == -1){
2039
perror_plus("fork");
2040
free(direntry);
2041
continue;
2042
}
2043
int status;
2044
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2045
perror_plus("waitpid");
2046
free(direntry);
2047
continue;
2048
}
2049
if(WIFEXITED(status)){
2050
if(WEXITSTATUS(status) != 0){
2051
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2052
" with status %d\n", direntry->d_name,
2053
WEXITSTATUS(status));
2054
free(direntry);
2055
continue;
2056
}
2057
} else if(WIFSIGNALED(status)){
2058
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2059
" signal %d\n", direntry->d_name,
2060
WTERMSIG(status));
2061
free(direntry);
2062
continue;
2063
} else {
2064
fprintf_plus(stderr, "Warning: network hook \"%s\""
2065
" crashed\n", direntry->d_name);
2066
free(direntry);
2067
continue;
2068
}
2069
}
2070
if(debug){
2071
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2072
direntry->d_name);
2073
}
2074
free(direntry);
2075
}
2076
free(direntries);
2077
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2078
perror_plus("close");
2079
} else {
2080
hookdir_fd = -1;
2081
}
2082
close(devnull);
2083
}
2084
2085
__attribute__((nonnull, warn_unused_result))
2086
error_t bring_up_interface(const char *const interface,
2087
const float delay){
2088
error_t old_errno = errno;
2089
int ret;
2090
struct ifreq network;
2091
unsigned int if_index = if_nametoindex(interface);
2092
if(if_index == 0){
2093
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2094
errno = old_errno;
2095
return ENXIO;
2096
}
2097
2098
if(quit_now){
2099
errno = old_errno;
2100
return EINTR;
2101
}
2102
2103
if(not interface_is_up(interface)){
2104
error_t ret_errno = 0, ioctl_errno = 0;
2105
if(not get_flags(interface, &network)){
2106
ret_errno = errno;
2107
fprintf_plus(stderr, "Failed to get flags for interface "
2108
"\"%s\"\n", interface);
2109
errno = old_errno;
2110
return ret_errno;
2111
}
2112
network.ifr_flags |= IFF_UP; /* set flag */
2113
2114
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2115
if(sd == -1){
2116
ret_errno = errno;
2117
perror_plus("socket");
2118
errno = old_errno;
2119
return ret_errno;
2120
}
2121
2122
if(quit_now){
2123
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2124
if(ret == -1){
2125
perror_plus("close");
2126
}
2127
errno = old_errno;
2128
return EINTR;
2129
}
2130
2131
if(debug){
2132
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2133
interface);
2134
}
2135
2136
/* Raise privileges */
2137
ret_errno = raise_privileges();
2138
if(ret_errno != 0){
2139
errno = ret_errno;
2140
perror_plus("Failed to raise privileges");
2141
}
2142
2143
#ifdef __linux__
2144
int ret_linux;
2145
bool restore_loglevel = false;
2146
if(ret_errno == 0){
2147
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2148
messages about the network interface to mess up the prompt */
2149
ret_linux = klogctl(8, NULL, 5);
2150
if(ret_linux == -1){
2151
perror_plus("klogctl");
2152
} else {
2153
restore_loglevel = true;
2154
}
2155
}
2156
#endif /* __linux__ */
2157
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2158
ioctl_errno = errno;
2159
#ifdef __linux__
2160
if(restore_loglevel){
2161
ret_linux = klogctl(7, NULL, 0);
2162
if(ret_linux == -1){
2163
perror_plus("klogctl");
2164
}
2165
}
2166
#endif /* __linux__ */
2167
2168
/* If raise_privileges() succeeded above */
2169
if(ret_errno == 0){
2170
/* Lower privileges */
2171
ret_errno = lower_privileges();
2172
if(ret_errno != 0){
2173
errno = ret_errno;
2174
perror_plus("Failed to lower privileges");
2175
}
2176
}
2177
2178
/* Close the socket */
2179
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2180
if(ret == -1){
2181
perror_plus("close");
2182
}
2183
2184
if(ret_setflags == -1){
2185
errno = ioctl_errno;
2186
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2187
errno = old_errno;
2188
return ioctl_errno;
2189
}
2190
} else if(debug){
2191
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2192
interface);
2193
}
2194
2195
/* Sleep checking until interface is running.
2196
Check every 0.25s, up to total time of delay */
2197
for(int i=0; i < delay * 4; i++){
2198
if(interface_is_running(interface)){
2199
break;
2200
}
2201
struct timespec sleeptime = { .tv_nsec = 250000000 };
2202
ret = nanosleep(&sleeptime, NULL);
2203
if(ret == -1 and errno != EINTR){
2204
perror_plus("nanosleep");
2205
}
2206
}
2207
2208
errno = old_errno;
2209
return 0;
2210
}
2211
2212
__attribute__((nonnull, warn_unused_result))
2213
error_t take_down_interface(const char *const interface){
2214
error_t old_errno = errno;
2215
struct ifreq network;
2216
unsigned int if_index = if_nametoindex(interface);
2217
if(if_index == 0){
2218
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2219
errno = old_errno;
2220
return ENXIO;
2221
}
2222
if(interface_is_up(interface)){
2223
error_t ret_errno = 0, ioctl_errno = 0;
2224
if(not get_flags(interface, &network) and debug){
2225
ret_errno = errno;
2226
fprintf_plus(stderr, "Failed to get flags for interface "
2227
"\"%s\"\n", interface);
2228
errno = old_errno;
2229
return ret_errno;
2230
}
2231
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2232
2233
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2234
if(sd == -1){
2235
ret_errno = errno;
2236
perror_plus("socket");
2237
errno = old_errno;
2238
return ret_errno;
2239
}
2240
2241
if(debug){
2242
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2243
interface);
2244
}
2245
2246
/* Raise privileges */
2247
ret_errno = raise_privileges();
2248
if(ret_errno != 0){
2249
errno = ret_errno;
2250
perror_plus("Failed to raise privileges");
2251
}
2252
2253
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2254
ioctl_errno = errno;
2255
2256
/* If raise_privileges() succeeded above */
2257
if(ret_errno == 0){
2258
/* Lower privileges */
2259
ret_errno = lower_privileges();
2260
if(ret_errno != 0){
2261
errno = ret_errno;
2262
perror_plus("Failed to lower privileges");
2263
}
2264
}
2265
2266
/* Close the socket */
2267
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
if(ret == -1){
2269
perror_plus("close");
2270
}
2271
2272
if(ret_setflags == -1){
2273
errno = ioctl_errno;
2274
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2275
errno = old_errno;
2276
return ioctl_errno;
2277
}
2278
} else if(debug){
2279
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2280
interface);
2281
}
2282
2283
errno = old_errno;
2284
return 0;
2285
}
2286
1407
2287
int main(int argc, char *argv[]){
2288
mandos_context mc = { .server = NULL, .dh_bits = 0,
2289
.priority = "SECURE256:!CTYPE-X.509:"
2290
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2291
.interfaces = NULL, .interfaces_size = 0 };
1408
2292
AvahiSServiceBrowser *sb = NULL;
1409
int error;
2293
error_t ret_errno;
1410
2294
int ret;
1411
2295
intmax_t tmpmax;
1412
2296
char *tmp;
1413
2297
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;
2298
char *interfaces_to_take_down = NULL;
2299
size_t interfaces_to_take_down_size = 0;
2300
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2301
char old_tempdir[] = "/tmp/mandosXXXXXX";
2302
char *tempdir = NULL;
1422
2303
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1423
2304
const char *seckey = PATHDIR "/" SECKEY;
1424
2305
const char *pubkey = PATHDIR "/" PUBKEY;
2306
const char *dh_params_file = NULL;
2307
char *interfaces_hooks = NULL;
1425
2308
1426
2309
bool gnutls_initialized = false;
1427
2310
bool gpgme_initialized = false;
1479
2362
.doc = "Bit length of the prime number used in the"
1480
2363
" Diffie-Hellman key exchange",
1481
2364
.group = 2 },
2365
{ .name = "dh-params", .key = 134,
2366
.arg = "FILE",
2367
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2368
" for the Diffie-Hellman key exchange",
2369
.group = 2 },
1482
2370
{ .name = "priority", .key = 130,
1483
2371
.arg = "STRING",
1484
2372
.doc = "GnuTLS priority string for the TLS handshake",
1489
2377
.group = 2 },
1490
2378
{ .name = "retry", .key = 132,
1491
2379
.arg = "SECONDS",
1492
.doc = "Retry interval used when denied by the mandos server",
2380
.doc = "Retry interval used when denied by the Mandos server",
1493
2381
.group = 2 },
1494
2382
{ .name = "network-hook-dir", .key = 133,
1495
2383
.arg = "DIR",
1518
2406
connect_to = arg;
1519
2407
break;
1520
2408
case 'i': /* --interface */
1521
interface = arg;
2409
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2410
arg, (int)',');
2411
if(ret_errno != 0){
2412
argp_error(state, "%s", strerror(ret_errno));
2413
}
1522
2414
break;
1523
2415
case 's': /* --seckey */
1524
2416
seckey = arg;
1535
2427
}
1536
2428
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1537
2429
break;
2430
case 134: /* --dh-params */
2431
dh_params_file = arg;
2432
break;
1538
2433
case 130: /* --priority */
1539
2434
mc.priority = arg;
1540
2435
break;
1567
2462
argp_state_help(state, state->out_stream,
1568
2463
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1569
2464
case 'V': /* --version */
1570
fprintf(state->out_stream, "Mandos plugin mandos-client: ");
1571
fprintf(state->out_stream, "%s\n", argp_program_version);
2465
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1572
2466
exit(argp_err_exit_status);
1573
2467
break;
1574
2468
default:
1597
2491
goto end;
1598
2492
}
1599
2493
}
1600
2494
1601
2495
{
1602
2496
/* Work around Debian bug #633582:
1603
2497
<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");
2498
2499
/* Re-raise privileges */
2500
ret_errno = raise_privileges();
2501
if(ret_errno != 0){
2502
errno = ret_errno;
2503
perror_plus("Failed to raise privileges");
1669
2504
} 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
}
2505
struct stat st;
2506
2507
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2508
int seckey_fd = open(seckey, O_RDONLY);
2509
if(seckey_fd == -1){
2510
perror_plus("open");
2511
} else {
2512
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2513
if(ret == -1){
2514
perror_plus("fstat");
2515
} else {
2516
if(S_ISREG(st.st_mode)
2517
and st.st_uid == 0 and st.st_gid == 0){
2518
ret = fchown(seckey_fd, uid, gid);
2519
if(ret == -1){
2520
perror_plus("fchown");
2521
}
2522
}
2523
}
2524
TEMP_FAILURE_RETRY(close(seckey_fd));
2525
}
2526
}
2527
2528
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2529
int pubkey_fd = open(pubkey, O_RDONLY);
2530
if(pubkey_fd == -1){
2531
perror_plus("open");
2532
} else {
2533
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2534
if(ret == -1){
2535
perror_plus("fstat");
2536
} else {
2537
if(S_ISREG(st.st_mode)
2538
and st.st_uid == 0 and st.st_gid == 0){
2539
ret = fchown(pubkey_fd, uid, gid);
2540
if(ret == -1){
2541
perror_plus("fchown");
2542
}
2543
}
2544
}
2545
TEMP_FAILURE_RETRY(close(pubkey_fd));
2546
}
2547
}
2548
2549
if(strcmp(dh_params_file, PATHDIR "/client-dhparams.pem" )
2550
== 0){
2551
int dhparams_fd = open(dh_params_file, O_RDONLY);
2552
if(dhparams_fd == -1){
2553
perror_plus("open");
2554
} else {
2555
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2556
if(ret == -1){
2557
perror_plus("fstat");
2558
} else {
2559
if(S_ISREG(st.st_mode)
2560
and st.st_uid == 0 and st.st_gid == 0){
2561
ret = fchown(dhparams_fd, uid, gid);
2562
if(ret == -1){
2563
perror_plus("fchown");
2564
}
2565
}
2566
}
2567
TEMP_FAILURE_RETRY(close(dhparams_fd));
2568
}
2569
}
2570
2571
/* Lower privileges */
2572
ret_errno = lower_privileges();
2573
if(ret_errno != 0){
2574
errno = ret_errno;
2575
perror_plus("Failed to lower privileges");
2576
}
2577
}
2578
}
2579
2580
/* Remove invalid interface names (except "none") */
2581
{
2582
char *interface = NULL;
2583
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2584
interface))){
2585
if(strcmp(interface, "none") != 0
2586
and if_nametoindex(interface) == 0){
2587
if(interface[0] != '\0'){
2588
fprintf_plus(stderr, "Not using nonexisting interface"
2589
" \"%s\"\n", interface);
2590
}
2591
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2592
interface = NULL;
2593
}
2594
}
2595
}
2596
2597
/* Run network hooks */
2598
{
2599
if(mc.interfaces != NULL){
2600
interfaces_hooks = malloc(mc.interfaces_size);
2601
if(interfaces_hooks == NULL){
2602
perror_plus("malloc");
2603
goto end;
2604
}
2605
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2606
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2607
}
2608
run_network_hooks("start", interfaces_hooks != NULL ?
2609
interfaces_hooks : "", delay);
1753
2610
}
1754
2611
1755
2612
if(not debug){
1756
2613
avahi_set_log_function(empty_log);
1757
2614
}
1758
2615
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
2616
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1794
2617
from the signal handler */
1795
2618
/* Initialize the pseudo-RNG for Avahi */
1796
2619
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");
2620
simple_poll = avahi_simple_poll_new();
2621
if(simple_poll == NULL){
2622
fprintf_plus(stderr,
2623
"Avahi: Failed to create simple poll object.\n");
1801
2624
exitcode = EX_UNAVAILABLE;
1802
2625
goto end;
1803
2626
}
1865
2688
}
1866
2689
}
1867
2690
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");
2691
/* If no interfaces were specified, make a list */
2692
if(mc.interfaces == NULL){
2693
struct dirent **direntries = NULL;
2694
/* Look for any good interfaces */
2695
ret = scandir(sys_class_net, &direntries, good_interface,
2696
alphasort);
2697
if(ret >= 1){
2698
/* Add all found interfaces to interfaces list */
2699
for(int i = 0; i < ret; ++i){
2700
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2701
direntries[i]->d_name);
2702
if(ret_errno != 0){
2703
errno = ret_errno;
2704
perror_plus("argz_add");
2705
free(direntries[i]);
2706
continue;
2707
}
2708
if(debug){
2709
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2710
direntries[i]->d_name);
2711
}
2712
free(direntries[i]);
2713
}
2714
free(direntries);
2715
} else {
2716
if(ret == 0){
2717
free(direntries);
2718
}
2719
fprintf_plus(stderr, "Could not find a network interface\n");
2720
exitcode = EXIT_FAILURE;
2721
goto end;
2722
}
2723
}
2724
2725
/* Bring up interfaces which are down, and remove any "none"s */
2726
{
2727
char *interface = NULL;
2728
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2729
interface))){
2730
/* If interface name is "none", stop bringing up interfaces.
2731
Also remove all instances of "none" from the list */
2732
if(strcmp(interface, "none") == 0){
2733
argz_delete(&mc.interfaces, &mc.interfaces_size,
2734
interface);
2735
interface = NULL;
2736
while((interface = argz_next(mc.interfaces,
2737
mc.interfaces_size, interface))){
2738
if(strcmp(interface, "none") == 0){
2739
argz_delete(&mc.interfaces, &mc.interfaces_size,
2740
interface);
2741
interface = NULL;
1954
2742
}
1955
2743
}
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
2744
break;
1974
2745
}
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
}
2746
bool interface_was_up = interface_is_up(interface);
2747
errno = bring_up_interface(interface, delay);
2748
if(not interface_was_up){
2749
if(errno != 0){
2750
perror_plus("Failed to bring up interface");
2751
} else {
2752
errno = argz_add(&interfaces_to_take_down,
2753
&interfaces_to_take_down_size,
2754
interface);
2755
if(errno != 0){
2756
perror_plus("argz_add");
2757
}
2758
}
2759
}
2760
}
2761
if(debug and (interfaces_to_take_down == NULL)){
2762
fprintf_plus(stderr, "No interfaces were brought up\n");
2763
}
2764
}
2765
2766
/* If we only got one interface, explicitly use only that one */
2767
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2768
if(debug){
2769
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2770
mc.interfaces);
2771
}
2772
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2012
2773
}
2013
2774
2014
2775
if(quit_now){
2015
2776
goto end;
2016
2777
}
2017
2778
2018
ret = init_gnutls_global(pubkey, seckey);
2779
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2019
2780
if(ret == -1){
2020
fprintf(stderr, "Mandos plugin mandos-client: "
2021
"init_gnutls_global failed\n");
2781
fprintf_plus(stderr, "init_gnutls_global failed\n");
2022
2782
exitcode = EX_UNAVAILABLE;
2023
2783
goto end;
2024
2784
} else {
2029
2789
goto end;
2030
2790
}
2031
2791
2032
if(mkdtemp(tempdir) == NULL){
2792
/* Try /run/tmp before /tmp */
2793
tempdir = mkdtemp(run_tempdir);
2794
if(tempdir == NULL and errno == ENOENT){
2795
if(debug){
2796
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2797
run_tempdir, old_tempdir);
2798
}
2799
tempdir = mkdtemp(old_tempdir);
2800
}
2801
if(tempdir == NULL){
2033
2802
perror_plus("mkdtemp");
2034
2803
goto end;
2035
2804
}
2036
tempdir_created = true;
2037
2805
2038
2806
if(quit_now){
2039
2807
goto end;
2040
2808
}
2041
2809
2042
if(not init_gpgme(pubkey, seckey, tempdir)){
2043
fprintf(stderr, "Mandos plugin mandos-client: "
2044
"init_gpgme failed\n");
2810
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2811
fprintf_plus(stderr, "init_gpgme failed\n");
2045
2812
exitcode = EX_UNAVAILABLE;
2046
2813
goto end;
2047
2814
} else {
2056
2823
/* Connect directly, do not use Zeroconf */
2057
2824
/* (Mainly meant for debugging) */
2058
2825
char *address = strrchr(connect_to, ':');
2826
2059
2827
if(address == NULL){
2060
fprintf(stderr, "Mandos plugin mandos-client: "
2061
"No colon in address\n");
2828
fprintf_plus(stderr, "No colon in address\n");
2062
2829
exitcode = EX_USAGE;
2063
2830
goto end;
2064
2831
}
2067
2834
goto end;
2068
2835
}
2069
2836
2070
uint16_t port;
2837
in_port_t port;
2071
2838
errno = 0;
2072
2839
tmpmax = strtoimax(address+1, &tmp, 10);
2073
2840
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");
2841
or tmpmax != (in_port_t)tmpmax){
2842
fprintf_plus(stderr, "Bad port number\n");
2077
2843
exitcode = EX_USAGE;
2078
2844
goto end;
2079
2845
}
2080
2846
2081
2847
if(quit_now){
2082
2848
goto end;
2083
2849
}
2084
2850
2085
port = (uint16_t)tmpmax;
2851
port = (in_port_t)tmpmax;
2086
2852
*address = '\0';
2087
2853
/* Colon in address indicates IPv6 */
2088
2854
int af;
2104
2870
}
2105
2871
2106
2872
while(not quit_now){
2107
ret = start_mandos_communication(address, port, if_index, af);
2873
ret = start_mandos_communication(address, port, if_index, af,
2874
&mc);
2108
2875
if(quit_now or ret == 0){
2109
2876
break;
2110
2877
}
2111
2878
if(debug){
2112
fprintf(stderr, "Mandos plugin mandos-client: "
2113
"Retrying in %d seconds\n", (int)retry_interval);
2879
fprintf_plus(stderr, "Retrying in %d seconds\n",
2880
(int)retry_interval);
2114
2881
}
2115
sleep((int)retry_interval);
2882
sleep((unsigned int)retry_interval);
2116
2883
}
2117
2884
2118
if (not quit_now){
2885
if(not quit_now){
2119
2886
exitcode = EXIT_SUCCESS;
2120
2887
}
2121
2888
2136
2903
config.publish_domain = 0;
2137
2904
2138
2905
/* Allocate a new server */
2139
mc.server = avahi_server_new(avahi_simple_poll_get
2140
(mc.simple_poll), &config, NULL,
2141
NULL, &error);
2906
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2907
&config, NULL, NULL, &ret_errno);
2142
2908
2143
2909
/* Free the Avahi configuration data */
2144
2910
avahi_server_config_free(&config);
2146
2912
2147
2913
/* Check if creating the Avahi server object succeeded */
2148
2914
if(mc.server == NULL){
2149
fprintf(stderr, "Mandos plugin mandos-client: "
2150
"Failed to create Avahi server: %s\n",
2151
avahi_strerror(error));
2915
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2916
avahi_strerror(ret_errno));
2152
2917
exitcode = EX_UNAVAILABLE;
2153
2918
goto end;
2154
2919
}
2160
2925
/* Create the Avahi service browser */
2161
2926
sb = avahi_s_service_browser_new(mc.server, if_index,
2162
2927
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2163
NULL, 0, browse_callback, NULL);
2928
NULL, 0, browse_callback,
2929
(void *)&mc);
2164
2930
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)));
2931
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2932
avahi_strerror(avahi_server_errno(mc.server)));
2168
2933
exitcode = EX_UNAVAILABLE;
2169
2934
goto end;
2170
2935
}
2176
2941
/* Run the main loop */
2177
2942
2178
2943
if(debug){
2179
fprintf(stderr, "Mandos plugin mandos-client: "
2180
"Starting Avahi loop search\n");
2944
fprintf_plus(stderr, "Starting Avahi loop search\n");
2181
2945
}
2182
2183
ret = avahi_loop_with_timeout(mc.simple_poll,
2184
(int)(retry_interval * 1000));
2946
2947
ret = avahi_loop_with_timeout(simple_poll,
2948
(int)(retry_interval * 1000), &mc);
2185
2949
if(debug){
2186
fprintf(stderr, "Mandos plugin mandos-client: "
2187
"avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2950
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2951
(ret == 0) ? "successfully" : "with error");
2189
2952
}
2190
2953
2191
2954
end:
2192
2955
2193
2956
if(debug){
2194
fprintf(stderr, "Mandos plugin mandos-client: "
2195
"%s exiting\n", argv[0]);
2957
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2196
2958
}
2197
2959
2198
2960
/* Cleanup things */
2961
free(mc.interfaces);
2962
2199
2963
if(sb != NULL)
2200
2964
avahi_s_service_browser_free(sb);
2201
2965
2202
2966
if(mc.server != NULL)
2203
2967
avahi_server_free(mc.server);
2204
2968
2205
if(mc.simple_poll != NULL)
2206
avahi_simple_poll_free(mc.simple_poll);
2969
if(simple_poll != NULL)
2970
avahi_simple_poll_free(simple_poll);
2207
2971
2208
2972
if(gnutls_initialized){
2209
2973
gnutls_certificate_free_credentials(mc.cred);
2214
2978
if(gpgme_initialized){
2215
2979
gpgme_release(mc.ctx);
2216
2980
}
2217
2981
2218
2982
/* Cleans up the circular linked list of Mandos servers the client
2219
2983
has seen */
2220
2984
if(mc.current_server != NULL){
2221
2985
mc.current_server->prev->next = NULL;
2222
2986
while(mc.current_server != NULL){
2223
2987
server *next = mc.current_server->next;
2988
#ifdef __GNUC__
2989
#pragma GCC diagnostic push
2990
#pragma GCC diagnostic ignored "-Wcast-qual"
2991
#endif
2992
free((char *)(mc.current_server->ip));
2993
#ifdef __GNUC__
2994
#pragma GCC diagnostic pop
2995
#endif
2224
2996
free(mc.current_server);
2225
2997
mc.current_server = next;
2226
2998
}
2227
2999
}
2228
3000
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");
3001
/* Re-raise privileges */
3002
{
3003
ret_errno = raise_privileges();
3004
if(ret_errno != 0){
3005
errno = ret_errno;
3006
perror_plus("Failed to raise privileges");
3007
} else {
3008
3009
/* Run network hooks */
3010
run_network_hooks("stop", interfaces_hooks != NULL ?
3011
interfaces_hooks : "", delay);
3012
3013
/* Take down the network interfaces which were brought up */
3014
{
3015
char *interface = NULL;
3016
while((interface=argz_next(interfaces_to_take_down,
3017
interfaces_to_take_down_size,
3018
interface))){
3019
ret_errno = take_down_interface(interface);
3020
if(ret_errno != 0){
3021
errno = ret_errno;
3022
perror_plus("Failed to take down interface");
3023
}
3024
}
3025
if(debug and (interfaces_to_take_down == NULL)){
3026
fprintf_plus(stderr, "No interfaces needed to be taken"
3027
" down\n");
3028
}
3029
}
2238
3030
}
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
}
3031
3032
ret_errno = lower_privileges_permanently();
3033
if(ret_errno != 0){
3034
errno = ret_errno;
3035
perror_plus("Failed to lower privileges permanently");
2260
3036
}
2261
3037
}
2262
3038
3039
free(interfaces_to_take_down);
3040
free(interfaces_hooks);
3041
2263
3042
/* Removes the GPGME temp directory and all files inside */
2264
if(tempdir_created){
3043
if(tempdir != NULL){
2265
3044
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);
3045
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3046
| O_NOFOLLOW
3047
| O_DIRECTORY
3048
| O_PATH));
3049
if(tempdir_fd == -1){
3050
perror_plus("open");
3051
} else {
3052
#ifdef __GLIBC__
3053
#if __GLIBC_PREREQ(2, 15)
3054
int numentries = scandirat(tempdir_fd, ".", &direntries,
3055
notdotentries, alphasort);
3056
#else /* not __GLIBC_PREREQ(2, 15) */
3057
int numentries = scandir(tempdir, &direntries, notdotentries,
3058
alphasort);
3059
#endif /* not __GLIBC_PREREQ(2, 15) */
3060
#else /* not __GLIBC__ */
3061
int numentries = scandir(tempdir, &direntries, notdotentries,
3062
alphasort);
3063
#endif /* not __GLIBC__ */
3064
if(numentries >= 0){
3065
for(int i = 0; i < numentries; i++){
3066
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3067
if(ret == -1){
3068
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3069
" \"%s\", 0): %s\n", tempdir,
3070
direntries[i]->d_name, strerror(errno));
3071
}
3072
free(direntries[i]);
3073
}
3074
3075
/* need to clean even if 0 because man page doesn't specify */
3076
free(direntries);
3077
if(numentries == -1){
3078
perror_plus("scandir");
3079
}
3080
ret = rmdir(tempdir);
3081
if(ret == -1 and errno != ENOENT){
3082
perror_plus("rmdir");
3083
}
2285
3084
}
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");
3085
TEMP_FAILURE_RETRY(close(tempdir_fd));
2296
3086
}
2297
3087
}
2298
3088
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0