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- Committer: Teddy Hogeborn
- Date: 2015-07-05 21:38:01 UTC
- mto: This revision was merged to the branch mainline in revision 759.
- Revision ID: teddy@recompile.se-20150705213801-pi8vk0ovlumuj826
plugin-helpers/mandos-client-iprouteadddel.c: Fix #include lines.
(main): Fix minor typo in error message.
(main): Fix minor typo in error message.
- 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() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
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,
85
86
raise() */
86
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
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() */
88
98
89
99
#ifdef __linux__
90
100
#include <sys/klog.h> /* klogctl() */
108
118
init_gnutls_session(),
109
119
GNUTLS_* */
110
120
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
113
123
114
124
/* GPGME */
115
125
#include <gpgme.h> /* All GPGME types, constants and
123
133
#define PATHDIR "/conf/conf.d/mandos"
124
134
#define SECKEY "seckey.txt"
125
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
126
137
127
138
bool debug = false;
128
139
static const char mandos_protocol_version[] = "1";
130
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
131
142
static const char sys_class_net[] = "/sys/class/net";
132
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
133
148
134
149
/* Doubly linked list that need to be circularly linked when used */
135
150
typedef struct server{
136
151
const char *ip;
137
uint16_t port;
152
in_port_t port;
138
153
AvahiIfIndex if_index;
139
154
int af;
140
155
struct timespec last_seen;
144
159
145
160
/* Used for passing in values through the Avahi callback functions */
146
161
typedef struct {
147
AvahiSimplePoll *simple_poll;
148
162
AvahiServer *server;
149
163
gnutls_certificate_credentials_t cred;
150
164
unsigned int dh_bits;
152
166
const char *priority;
153
167
gpgme_ctx_t ctx;
154
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
155
171
} mandos_context;
156
172
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
162
175
163
176
sig_atomic_t quit_now = 0;
164
177
int signal_received = 0;
165
178
166
179
/* Function to use when printing errors */
167
180
void perror_plus(const char *print_text){
181
int e = errno;
168
182
fprintf(stderr, "Mandos plugin %s: ",
169
183
program_invocation_short_name);
184
errno = e;
170
185
perror(print_text);
171
186
}
172
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
173
198
/*
174
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
200
* bytes. "buffer_capacity" is how much is currently allocated,
176
201
* "buffer_length" is how much is already used.
177
202
*/
203
__attribute__((nonnull, warn_unused_result))
178
204
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
205
size_t buffer_capacity){
180
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
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;
183
213
return 0;
184
214
}
215
*buffer = new_buf;
185
216
buffer_capacity += BUFFER_SIZE;
186
217
}
187
218
return buffer_capacity;
188
219
}
189
220
190
221
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
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){
194
225
int ret;
195
226
server *new_server = malloc(sizeof(server));
196
227
if(new_server == NULL){
197
228
perror_plus("malloc");
198
return -1;
229
return false;
199
230
}
200
231
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
232
.port = port,
233
.if_index = if_index,
234
.af = af };
204
235
if(new_server->ip == NULL){
205
236
perror_plus("strdup");
206
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;
207
253
}
208
254
/* Special case of first server */
209
if (mc.current_server == NULL){
255
if(*current_server == NULL){
210
256
new_server->next = new_server;
211
257
new_server->prev = new_server;
212
mc.current_server = new_server;
213
/* Place the new server last in the list */
258
*current_server = new_server;
214
259
} else {
215
new_server->next = mc.current_server;
216
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;
217
263
new_server->prev->next = new_server;
218
mc.current_server->prev = new_server;
219
}
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
if(ret == -1){
222
perror_plus("clock_gettime");
223
return -1;
224
}
225
return 0;
264
(*current_server)->prev = new_server;
265
}
266
return true;
226
267
}
227
268
228
269
/*
229
270
* Initialize GPGME.
230
271
*/
231
static bool init_gpgme(const char *seckey,
232
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){
233
277
gpgme_error_t rc;
234
278
gpgme_engine_info_t engine_info;
235
279
236
237
280
/*
238
281
* Helper function to insert pub and seckey to the engine keyring.
239
282
*/
240
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
241
284
int ret;
242
285
int fd;
243
286
gpgme_data_t pgp_data;
250
293
251
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
252
295
if(rc != GPG_ERR_NO_ERROR){
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
254
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));
255
298
return false;
256
299
}
257
300
258
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
259
302
if(rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
262
305
return false;
263
306
}
264
307
271
314
}
272
315
273
316
if(debug){
274
fprintf(stderr, "Initializing GPGME\n");
317
fprintf_plus(stderr, "Initializing GPGME\n");
275
318
}
276
319
277
320
/* Init GPGME */
278
321
gpgme_check_version(NULL);
279
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
280
323
if(rc != GPG_ERR_NO_ERROR){
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
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));
283
326
return false;
284
327
}
285
328
286
329
/* Set GPGME home directory for the OpenPGP engine only */
287
330
rc = gpgme_get_engine_info(&engine_info);
288
331
if(rc != GPG_ERR_NO_ERROR){
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
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));
291
334
return false;
292
335
}
293
336
while(engine_info != NULL){
299
342
engine_info = engine_info->next;
300
343
}
301
344
if(engine_info == NULL){
302
fprintf(stderr, "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);
303
347
return false;
304
348
}
305
349
306
350
/* Create new GPGME "context" */
307
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
308
352
if(rc != GPG_ERR_NO_ERROR){
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), 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));
311
356
return false;
312
357
}
313
358
322
367
* Decrypt OpenPGP data.
323
368
* Returns -1 on error
324
369
*/
370
__attribute__((nonnull, warn_unused_result))
325
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
326
372
size_t crypto_size,
327
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
328
375
gpgme_data_t dh_crypto, dh_plain;
329
376
gpgme_error_t rc;
330
377
ssize_t ret;
332
379
ssize_t plaintext_length = 0;
333
380
334
381
if(debug){
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
336
383
}
337
384
338
385
/* Create new GPGME data buffer from memory cryptotext */
339
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
340
387
0);
341
388
if(rc != GPG_ERR_NO_ERROR){
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
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));
344
391
return -1;
345
392
}
346
393
347
394
/* Create new empty GPGME data buffer for the plaintext */
348
395
rc = gpgme_data_new(&dh_plain);
349
396
if(rc != GPG_ERR_NO_ERROR){
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
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));
352
400
gpgme_data_release(dh_crypto);
353
401
return -1;
354
402
}
355
403
356
404
/* Decrypt data from the cryptotext data buffer to the plaintext
357
405
data buffer */
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
359
407
if(rc != GPG_ERR_NO_ERROR){
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
362
410
plaintext_length = -1;
363
411
if(debug){
364
412
gpgme_decrypt_result_t result;
365
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
366
414
if(result == NULL){
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
416
} else {
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
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);
373
421
if(result->file_name != NULL){
374
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
423
}
376
424
gpgme_recipient_t recipient;
377
425
recipient = result->recipients;
378
426
while(recipient != NULL){
379
fprintf(stderr, "Public key algorithm: %s\n",
380
gpgme_pubkey_algo_name(recipient->pubkey_algo));
381
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
382
fprintf(stderr, "Secret key available: %s\n",
383
recipient->status == GPG_ERR_NO_SECKEY
384
? "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");
385
434
recipient = recipient->next;
386
435
}
387
436
}
390
439
}
391
440
392
441
if(debug){
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
394
443
}
395
444
396
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
403
452
*plaintext = NULL;
404
453
while(true){
405
454
plaintext_capacity = incbuffer(plaintext,
406
(size_t)plaintext_length,
407
plaintext_capacity);
455
(size_t)plaintext_length,
456
plaintext_capacity);
408
457
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
410
plaintext_length = -1;
411
goto decrypt_end;
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
412
461
}
413
462
414
463
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
427
476
}
428
477
429
478
if(debug){
430
fprintf(stderr, "Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
431
480
for(ssize_t i = 0; i < plaintext_length; i++){
432
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
433
482
}
444
493
return plaintext_length;
445
494
}
446
495
447
static const char * safer_gnutls_strerror(int value){
448
const char *ret = gnutls_strerror(value); /* Spurious warning from
449
-Wunreachable-code */
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
450
499
if(ret == NULL)
451
500
ret = "(unknown)";
452
501
return ret;
453
502
}
454
503
455
504
/* GnuTLS log function callback */
505
__attribute__((nonnull))
456
506
static void debuggnutls(__attribute__((unused)) int level,
457
507
const char* string){
458
fprintf(stderr, "GnuTLS: %s", string);
508
fprintf_plus(stderr, "GnuTLS: %s", string);
459
509
}
460
510
511
__attribute__((nonnull, warn_unused_result))
461
512
static int init_gnutls_global(const char *pubkeyfilename,
462
const char *seckeyfilename){
513
const char *seckeyfilename,
514
mandos_context *mc){
463
515
int ret;
464
516
465
517
if(debug){
466
fprintf(stderr, "Initializing GnuTLS\n");
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
467
519
}
468
520
469
521
ret = gnutls_global_init();
470
522
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
473
525
return -1;
474
526
}
475
527
482
534
}
483
535
484
536
/* OpenPGP credentials */
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
486
538
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
489
541
gnutls_global_deinit();
490
542
return -1;
491
543
}
492
544
493
545
if(debug){
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
seckeyfilename);
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
548
pubkeyfilename,
549
seckeyfilename);
497
550
}
498
551
499
552
ret = gnutls_certificate_set_openpgp_key_file
500
(mc.cred, pubkeyfilename, seckeyfilename,
553
(mc->cred, pubkeyfilename, seckeyfilename,
501
554
GNUTLS_OPENPGP_FMT_BASE64);
502
555
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr,
504
"Error[%d] while reading the OpenPGP key pair ('%s',"
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
506
fprintf(stderr, "The GnuTLS error is: %s\n",
507
safer_gnutls_strerror(ret));
556
fprintf_plus(stderr,
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
558
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
559
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
safer_gnutls_strerror(ret));
508
561
goto globalfail;
509
562
}
510
563
511
564
/* GnuTLS server initialization */
512
ret = gnutls_dh_params_init(&mc.dh_params);
565
ret = gnutls_dh_params_init(&mc->dh_params);
513
566
if(ret != GNUTLS_E_SUCCESS){
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
516
570
goto globalfail;
517
571
}
518
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
519
573
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
522
576
goto globalfail;
523
577
}
524
578
525
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
526
580
527
581
return 0;
528
582
529
583
globalfail:
530
584
531
gnutls_certificate_free_credentials(mc.cred);
585
gnutls_certificate_free_credentials(mc->cred);
532
586
gnutls_global_deinit();
533
gnutls_dh_params_deinit(mc.dh_params);
587
gnutls_dh_params_deinit(mc->dh_params);
534
588
return -1;
535
589
}
536
590
537
static int init_gnutls_session(gnutls_session_t *session){
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
538
594
int ret;
539
595
/* GnuTLS session creation */
540
596
do {
544
600
}
545
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
546
602
if(ret != GNUTLS_E_SUCCESS){
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
safer_gnutls_strerror(ret));
603
fprintf_plus(stderr,
604
"Error in GnuTLS session initialization: %s\n",
605
safer_gnutls_strerror(ret));
549
606
}
550
607
551
608
{
552
609
const char *err;
553
610
do {
554
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
555
612
if(quit_now){
556
613
gnutls_deinit(*session);
557
614
return -1;
558
615
}
559
616
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
560
617
if(ret != GNUTLS_E_SUCCESS){
561
fprintf(stderr, "Syntax error at: %s\n", err);
562
fprintf(stderr, "GnuTLS error: %s\n",
563
safer_gnutls_strerror(ret));
618
fprintf_plus(stderr, "Syntax error at: %s\n", err);
619
fprintf_plus(stderr, "GnuTLS error: %s\n",
620
safer_gnutls_strerror(ret));
564
621
gnutls_deinit(*session);
565
622
return -1;
566
623
}
568
625
569
626
do {
570
627
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
571
mc.cred);
628
mc->cred);
572
629
if(quit_now){
573
630
gnutls_deinit(*session);
574
631
return -1;
575
632
}
576
633
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
577
634
if(ret != GNUTLS_E_SUCCESS){
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
safer_gnutls_strerror(ret));
635
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
636
safer_gnutls_strerror(ret));
580
637
gnutls_deinit(*session);
581
638
return -1;
582
639
}
584
641
/* ignore client certificate if any. */
585
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
586
643
587
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
588
645
589
646
return 0;
590
647
}
593
650
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
594
651
__attribute__((unused)) const char *txt){}
595
652
653
/* Set effective uid to 0, return errno */
654
__attribute__((warn_unused_result))
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
658
if(seteuid(0) == -1){
659
ret_errno = errno;
660
}
661
errno = old_errno;
662
return ret_errno;
663
}
664
665
/* Set effective and real user ID to 0. Return errno. */
666
__attribute__((warn_unused_result))
667
error_t raise_privileges_permanently(void){
668
error_t old_errno = errno;
669
error_t ret_errno = raise_privileges();
670
if(ret_errno != 0){
671
errno = old_errno;
672
return ret_errno;
673
}
674
if(setuid(0) == -1){
675
ret_errno = errno;
676
}
677
errno = old_errno;
678
return ret_errno;
679
}
680
681
/* Set effective user ID to unprivileged saved user ID */
682
__attribute__((warn_unused_result))
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
686
if(seteuid(uid) == -1){
687
ret_errno = errno;
688
}
689
errno = old_errno;
690
return ret_errno;
691
}
692
693
/* Lower privileges permanently */
694
__attribute__((warn_unused_result))
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
698
if(setuid(uid) == -1){
699
ret_errno = errno;
700
}
701
errno = old_errno;
702
return ret_errno;
703
}
704
705
/* Helper function to add_local_route() and remove_local_route() */
706
__attribute__((nonnull, warn_unused_result))
707
static bool add_remove_local_route(const bool add,
708
const char *address,
709
AvahiIfIndex if_index){
710
int ret;
711
char helper[] = "mandos-client-iprouteadddel";
712
char add_arg[] = "add";
713
char delete_arg[] = "delete";
714
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
715
if(pluginhelperdir == NULL){
716
if(debug){
717
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
718
" variable not set; cannot run helper\n");
719
}
720
return false;
721
}
722
723
char interface[IF_NAMESIZE];
724
if(if_indextoname((unsigned int)if_index, interface) == NULL){
725
perror_plus("if_indextoname");
726
return false;
727
}
728
729
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
730
if(devnull == -1){
731
perror_plus("open(\"/dev/null\", O_RDONLY)");
732
return false;
733
}
734
pid_t pid = fork();
735
if(pid == 0){
736
/* Child */
737
/* Raise privileges */
738
errno = raise_privileges_permanently();
739
if(errno != 0){
740
perror_plus("Failed to raise privileges");
741
/* _exit(EX_NOPERM); */
742
} else {
743
/* Set group */
744
errno = 0;
745
ret = setgid(0);
746
if(ret == -1){
747
perror_plus("setgid");
748
_exit(EX_NOPERM);
749
}
750
/* Reset supplementary groups */
751
errno = 0;
752
ret = setgroups(0, NULL);
753
if(ret == -1){
754
perror_plus("setgroups");
755
_exit(EX_NOPERM);
756
}
757
}
758
ret = dup2(devnull, STDIN_FILENO);
759
if(ret == -1){
760
perror_plus("dup2(devnull, STDIN_FILENO)");
761
_exit(EX_OSERR);
762
}
763
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
764
if(ret == -1){
765
perror_plus("close");
766
_exit(EX_OSERR);
767
}
768
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
769
if(ret == -1){
770
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
771
_exit(EX_OSERR);
772
}
773
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
774
O_RDONLY
775
| O_DIRECTORY
776
| O_PATH
777
| O_CLOEXEC));
778
if(helperdir_fd == -1){
779
perror_plus("open");
780
_exit(EX_UNAVAILABLE);
781
}
782
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
783
helper, O_RDONLY));
784
if(helper_fd == -1){
785
perror_plus("openat");
786
_exit(EX_UNAVAILABLE);
787
}
788
TEMP_FAILURE_RETRY(close(helperdir_fd));
789
#ifdef __GNUC__
790
#pragma GCC diagnostic push
791
#pragma GCC diagnostic ignored "-Wcast-qual"
792
#endif
793
if(fexecve(helper_fd, (char *const [])
794
{ helper, add ? add_arg : delete_arg, (char *)address,
795
interface, NULL }, environ) == -1){
796
#ifdef __GNUC__
797
#pragma GCC diagnostic pop
798
#endif
799
perror_plus("fexecve");
800
_exit(EXIT_FAILURE);
801
}
802
}
803
if(pid == -1){
804
perror_plus("fork");
805
return false;
806
}
807
int status;
808
pid_t pret = -1;
809
errno = 0;
810
do {
811
pret = waitpid(pid, &status, 0);
812
if(pret == -1 and errno == EINTR and quit_now){
813
int errno_raising = 0;
814
if((errno = raise_privileges()) != 0){
815
errno_raising = errno;
816
perror_plus("Failed to raise privileges in order to"
817
" kill helper program");
818
}
819
if(kill(pid, SIGTERM) == -1){
820
perror_plus("kill");
821
}
822
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
823
perror_plus("Failed to lower privileges after killing"
824
" helper program");
825
}
826
return false;
827
}
828
} while(pret == -1 and errno == EINTR);
829
if(pret == -1){
830
perror_plus("waitpid");
831
return false;
832
}
833
if(WIFEXITED(status)){
834
if(WEXITSTATUS(status) != 0){
835
fprintf_plus(stderr, "Error: iprouteadddel exited"
836
" with status %d\n", WEXITSTATUS(status));
837
return false;
838
}
839
return true;
840
}
841
if(WIFSIGNALED(status)){
842
fprintf_plus(stderr, "Error: iprouteadddel died by"
843
" signal %d\n", WTERMSIG(status));
844
return false;
845
}
846
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
847
return false;
848
}
849
850
__attribute__((nonnull, warn_unused_result))
851
static bool add_local_route(const char *address,
852
AvahiIfIndex if_index){
853
return add_remove_local_route(true, address, if_index);
854
}
855
856
__attribute__((nonnull, warn_unused_result))
857
static bool remove_local_route(const char *address,
858
AvahiIfIndex if_index){
859
return add_remove_local_route(false, address, if_index);
860
}
861
596
862
/* Called when a Mandos server is found */
597
static int start_mandos_communication(const char *ip, uint16_t port,
863
__attribute__((nonnull, warn_unused_result))
864
static int start_mandos_communication(const char *ip, in_port_t port,
598
865
AvahiIfIndex if_index,
599
int af){
866
int af, mandos_context *mc){
600
867
int ret, tcp_sd = -1;
601
868
ssize_t sret;
602
union {
603
struct sockaddr_in in;
604
struct sockaddr_in6 in6;
605
} to;
869
struct sockaddr_storage to;
606
870
char *buffer = NULL;
607
871
char *decrypted_buffer = NULL;
608
872
size_t buffer_length = 0;
611
875
int retval = -1;
612
876
gnutls_session_t session;
613
877
int pf; /* Protocol family */
878
bool route_added = false;
614
879
615
880
errno = 0;
616
881
627
892
pf = PF_INET;
628
893
break;
629
894
default:
630
fprintf(stderr, "Bad address family: %d\n", af);
895
fprintf_plus(stderr, "Bad address family: %d\n", af);
631
896
errno = EINVAL;
632
897
return -1;
633
898
}
634
899
635
ret = init_gnutls_session(&session);
900
/* If the interface is specified and we have a list of interfaces */
901
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
902
/* Check if the interface is one of the interfaces we are using */
903
bool match = false;
904
{
905
char *interface = NULL;
906
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
907
interface))){
908
if(if_nametoindex(interface) == (unsigned int)if_index){
909
match = true;
910
break;
911
}
912
}
913
}
914
if(not match){
915
/* This interface does not match any in the list, so we don't
916
connect to the server */
917
if(debug){
918
char interface[IF_NAMESIZE];
919
if(if_indextoname((unsigned int)if_index, interface) == NULL){
920
perror_plus("if_indextoname");
921
} else {
922
fprintf_plus(stderr, "Skipping server on non-used interface"
923
" \"%s\"\n",
924
if_indextoname((unsigned int)if_index,
925
interface));
926
}
927
}
928
return -1;
929
}
930
}
931
932
ret = init_gnutls_session(&session, mc);
636
933
if(ret != 0){
637
934
return -1;
638
935
}
639
936
640
937
if(debug){
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
938
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
939
PRIuMAX "\n", ip, (uintmax_t)port);
643
940
}
644
941
645
tcp_sd = socket(pf, SOCK_STREAM, 0);
942
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
646
943
if(tcp_sd < 0){
647
944
int e = errno;
648
945
perror_plus("socket");
657
954
658
955
memset(&to, 0, sizeof(to));
659
956
if(af == AF_INET6){
660
to.in6.sin6_family = (sa_family_t)af;
661
ret = inet_pton(af, ip, &to.in6.sin6_addr);
957
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
958
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
662
959
} else { /* IPv4 */
663
to.in.sin_family = (sa_family_t)af;
664
ret = inet_pton(af, ip, &to.in.sin_addr);
960
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
961
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
665
962
}
666
963
if(ret < 0 ){
667
964
int e = errno;
671
968
}
672
969
if(ret == 0){
673
970
int e = errno;
674
fprintf(stderr, "Bad address: %s\n", ip);
971
fprintf_plus(stderr, "Bad address: %s\n", ip);
675
972
errno = e;
676
973
goto mandos_end;
677
974
}
678
975
if(af == AF_INET6){
679
to.in6.sin6_port = htons(port); /* Spurious warnings from
680
-Wconversion and
681
-Wunreachable-code */
682
683
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
684
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
685
-Wunreachable-code*/
976
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
977
if(IN6_IS_ADDR_LINKLOCAL
978
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
686
979
if(if_index == AVAHI_IF_UNSPEC){
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
980
fprintf_plus(stderr, "An IPv6 link-local address is"
981
" incomplete without a network interface\n");
689
982
errno = EINVAL;
690
983
goto mandos_end;
691
984
}
692
985
/* Set the network interface number as scope */
693
to.in6.sin6_scope_id = (uint32_t)if_index;
986
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
694
987
}
695
988
} else {
696
to.in.sin_port = htons(port); /* Spurious warnings from
697
-Wconversion and
698
-Wunreachable-code */
989
((struct sockaddr_in *)&to)->sin_port = htons(port);
699
990
}
700
991
701
992
if(quit_now){
709
1000
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
1001
perror_plus("if_indextoname");
711
1002
} else {
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
1003
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1004
"\n", ip, interface, (uintmax_t)port);
714
1005
}
715
1006
} else {
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
1007
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1008
ip, (uintmax_t)port);
718
1009
}
719
1010
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
720
1011
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
721
const char *pcret;
722
if(af == AF_INET6){
723
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
724
sizeof(addrstr));
725
} else {
726
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
727
sizeof(addrstr));
728
}
729
if(pcret == NULL){
730
perror_plus("inet_ntop");
731
} else {
732
if(strcmp(addrstr, ip) != 0){
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
734
}
735
}
736
}
737
738
if(quit_now){
739
errno = EINTR;
740
goto mandos_end;
741
}
742
743
if(af == AF_INET6){
744
ret = connect(tcp_sd, &to.in6, sizeof(to));
745
} else {
746
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
747
}
748
if(ret < 0){
749
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
750
int e = errno;
751
perror_plus("connect");
752
errno = e;
753
}
754
goto mandos_end;
755
}
756
757
if(quit_now){
758
errno = EINTR;
759
goto mandos_end;
1012
if(af == AF_INET6){
1013
ret = getnameinfo((struct sockaddr *)&to,
1014
sizeof(struct sockaddr_in6),
1015
addrstr, sizeof(addrstr), NULL, 0,
1016
NI_NUMERICHOST);
1017
} else {
1018
ret = getnameinfo((struct sockaddr *)&to,
1019
sizeof(struct sockaddr_in),
1020
addrstr, sizeof(addrstr), NULL, 0,
1021
NI_NUMERICHOST);
1022
}
1023
if(ret == EAI_SYSTEM){
1024
perror_plus("getnameinfo");
1025
} else if(ret != 0) {
1026
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1027
} else if(strcmp(addrstr, ip) != 0){
1028
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1029
}
1030
}
1031
1032
if(quit_now){
1033
errno = EINTR;
1034
goto mandos_end;
1035
}
1036
1037
while(true){
1038
if(af == AF_INET6){
1039
ret = connect(tcp_sd, (struct sockaddr *)&to,
1040
sizeof(struct sockaddr_in6));
1041
} else {
1042
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1043
sizeof(struct sockaddr_in));
1044
}
1045
if(ret < 0){
1046
if(errno == ENETUNREACH
1047
and if_index != AVAHI_IF_UNSPEC
1048
and connect_to == NULL
1049
and not route_added and
1050
((af == AF_INET6 and not
1051
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1052
&to)->sin6_addr)))
1053
or (af == AF_INET and
1054
/* Not a a IPv4LL address */
1055
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1056
& 0xFFFF0000L) != 0xA9FE0000L))){
1057
/* Work around Avahi bug - Avahi does not announce link-local
1058
addresses if it has a global address, so local hosts with
1059
*only* a link-local address (e.g. Mandos clients) cannot
1060
connect to a Mandos server announced by Avahi on a server
1061
host with a global address. Work around this by retrying
1062
with an explicit route added with the server's address.
1063
1064
Avahi bug reference:
1065
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1066
https://bugs.debian.org/587961
1067
*/
1068
int e = errno;
1069
route_added = add_local_route(ip, if_index);
1070
if(route_added){
1071
continue;
1072
}
1073
errno = e;
1074
}
1075
if(errno != ECONNREFUSED or debug){
1076
int e = errno;
1077
perror_plus("connect");
1078
errno = e;
1079
}
1080
goto mandos_end;
1081
}
1082
1083
if(quit_now){
1084
errno = EINTR;
1085
goto mandos_end;
1086
}
1087
break;
760
1088
}
761
1089
762
1090
const char *out = mandos_protocol_version;
764
1092
while(true){
765
1093
size_t out_size = strlen(out);
766
1094
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
out_size - written));
1095
out_size - written));
768
1096
if(ret == -1){
769
1097
int e = errno;
770
1098
perror_plus("write");
790
1118
}
791
1119
792
1120
if(debug){
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1121
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
794
1122
}
795
1123
796
1124
if(quit_now){
798
1126
goto mandos_end;
799
1127
}
800
1128
801
/* Spurious warning from -Wint-to-pointer-cast */
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1129
/* This casting via intptr_t is to eliminate warning about casting
1130
an int to a pointer type. This is exactly how the GnuTLS Guile
1131
function "set-session-transport-fd!" does it. */
1132
gnutls_transport_set_ptr(session,
1133
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
803
1134
804
1135
if(quit_now){
805
1136
errno = EINTR;
816
1147
817
1148
if(ret != GNUTLS_E_SUCCESS){
818
1149
if(debug){
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1150
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
820
1151
gnutls_perror(ret);
821
1152
}
822
1153
errno = EPROTO;
826
1157
/* Read OpenPGP packet that contains the wanted password */
827
1158
828
1159
if(debug){
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
830
ip);
1160
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1161
" %s\n", ip);
831
1162
}
832
1163
833
1164
while(true){
838
1169
}
839
1170
840
1171
buffer_capacity = incbuffer(&buffer, buffer_length,
841
buffer_capacity);
1172
buffer_capacity);
842
1173
if(buffer_capacity == 0){
843
1174
int e = errno;
844
1175
perror_plus("incbuffer");
871
1202
}
872
1203
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
873
1204
if(ret < 0){
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1205
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1206
"***\n");
875
1207
gnutls_perror(ret);
876
1208
errno = EPROTO;
877
1209
goto mandos_end;
878
1210
}
879
1211
break;
880
1212
default:
881
fprintf(stderr, "Unknown error while reading data from"
882
" encrypted session with Mandos server\n");
1213
fprintf_plus(stderr, "Unknown error while reading data from"
1214
" encrypted session with Mandos server\n");
883
1215
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
1216
errno = EIO;
885
1217
goto mandos_end;
890
1222
}
891
1223
892
1224
if(debug){
893
fprintf(stderr, "Closing TLS session\n");
1225
fprintf_plus(stderr, "Closing TLS session\n");
894
1226
}
895
1227
896
1228
if(quit_now){
908
1240
909
1241
if(buffer_length > 0){
910
1242
ssize_t decrypted_buffer_size;
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
buffer_length,
913
&decrypted_buffer);
1243
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1244
&decrypted_buffer, mc);
914
1245
if(decrypted_buffer_size >= 0){
915
1246
916
1247
written = 0;
926
1257
if(ret == 0 and ferror(stdout)){
927
1258
int e = errno;
928
1259
if(debug){
929
fprintf(stderr, "Error writing encrypted data: %s\n",
930
strerror(errno));
1260
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1261
strerror(errno));
931
1262
}
932
1263
errno = e;
933
1264
goto mandos_end;
942
1273
943
1274
mandos_end:
944
1275
{
1276
if(route_added){
1277
if(not remove_local_route(ip, if_index)){
1278
fprintf_plus(stderr, "Failed to remove local route to %s on"
1279
" interface %d", ip, if_index);
1280
}
1281
}
945
1282
int e = errno;
946
1283
free(decrypted_buffer);
947
1284
free(buffer);
964
1301
return retval;
965
1302
}
966
1303
1304
__attribute__((nonnull))
967
1305
static void resolve_callback(AvahiSServiceResolver *r,
968
1306
AvahiIfIndex interface,
969
1307
AvahiProtocol proto,
977
1315
AVAHI_GCC_UNUSED AvahiStringList *txt,
978
1316
AVAHI_GCC_UNUSED AvahiLookupResultFlags
979
1317
flags,
980
AVAHI_GCC_UNUSED void* userdata){
981
assert(r);
1318
void *mc){
1319
if(r == NULL){
1320
return;
1321
}
982
1322
983
1323
/* Called whenever a service has been resolved successfully or
984
1324
timed out */
985
1325
986
1326
if(quit_now){
1327
avahi_s_service_resolver_free(r);
987
1328
return;
988
1329
}
989
1330
990
1331
switch(event){
991
1332
default:
992
1333
case AVAHI_RESOLVER_FAILURE:
993
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
994
" of type '%s' in domain '%s': %s\n", name, type, domain,
995
avahi_strerror(avahi_server_errno(mc.server)));
1334
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1335
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1336
domain,
1337
avahi_strerror(avahi_server_errno
1338
(((mandos_context*)mc)->server)));
996
1339
break;
997
1340
998
1341
case AVAHI_RESOLVER_FOUND:
1000
1343
char ip[AVAHI_ADDRESS_STR_MAX];
1001
1344
avahi_address_snprint(ip, sizeof(ip), address);
1002
1345
if(debug){
1003
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1005
ip, (intmax_t)interface, port);
1346
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1347
PRIdMAX ") on port %" PRIu16 "\n", name,
1348
host_name, ip, (intmax_t)interface, port);
1006
1349
}
1007
int ret = start_mandos_communication(ip, port, interface,
1008
avahi_proto_to_af(proto));
1350
int ret = start_mandos_communication(ip, (in_port_t)port,
1351
interface,
1352
avahi_proto_to_af(proto),
1353
mc);
1009
1354
if(ret == 0){
1010
avahi_simple_poll_quit(mc.simple_poll);
1355
avahi_simple_poll_quit(simple_poll);
1011
1356
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1357
if(not add_server(ip, (in_port_t)port, interface,
1358
avahi_proto_to_af(proto),
1359
&((mandos_context*)mc)->current_server)){
1360
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1361
" list\n", name);
1362
}
1014
1363
}
1015
1364
}
1016
1365
}
1026
1375
const char *domain,
1027
1376
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1028
1377
flags,
1029
AVAHI_GCC_UNUSED void* userdata){
1030
assert(b);
1378
void *mc){
1379
if(b == NULL){
1380
return;
1381
}
1031
1382
1032
1383
/* Called whenever a new services becomes available on the LAN or
1033
1384
is removed from the LAN */
1040
1391
default:
1041
1392
case AVAHI_BROWSER_FAILURE:
1042
1393
1043
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1045
avahi_simple_poll_quit(mc.simple_poll);
1394
fprintf_plus(stderr, "(Avahi browser) %s\n",
1395
avahi_strerror(avahi_server_errno
1396
(((mandos_context*)mc)->server)));
1397
avahi_simple_poll_quit(simple_poll);
1046
1398
return;
1047
1399
1048
1400
case AVAHI_BROWSER_NEW:
1051
1403
the callback function is called the Avahi server will free the
1052
1404
resolver for us. */
1053
1405
1054
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1055
name, type, domain, protocol, 0,
1056
resolve_callback, NULL) == NULL)
1057
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
1406
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1407
interface, protocol, name, type,
1408
domain, protocol, 0,
1409
resolve_callback, mc) == NULL)
1410
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1411
" %s\n", name,
1412
avahi_strerror(avahi_server_errno
1413
(((mandos_context*)mc)->server)));
1059
1414
break;
1060
1415
1061
1416
case AVAHI_BROWSER_REMOVE:
1064
1419
case AVAHI_BROWSER_ALL_FOR_NOW:
1065
1420
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1066
1421
if(debug){
1067
fprintf(stderr, "No Mandos server found, still searching...\n");
1422
fprintf_plus(stderr, "No Mandos server found, still"
1423
" searching...\n");
1068
1424
}
1069
1425
break;
1070
1426
}
1079
1435
signal_received = sig;
1080
1436
int old_errno = errno;
1081
1437
/* set main loop to exit */
1082
if(mc.simple_poll != NULL){
1083
avahi_simple_poll_quit(mc.simple_poll);
1438
if(simple_poll != NULL){
1439
avahi_simple_poll_quit(simple_poll);
1084
1440
}
1085
1441
errno = old_errno;
1086
1442
}
1087
1443
1444
__attribute__((nonnull, warn_unused_result))
1445
bool get_flags(const char *ifname, struct ifreq *ifr){
1446
int ret;
1447
error_t ret_errno;
1448
1449
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1450
if(s < 0){
1451
ret_errno = errno;
1452
perror_plus("socket");
1453
errno = ret_errno;
1454
return false;
1455
}
1456
strcpy(ifr->ifr_name, ifname);
1457
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1458
if(ret == -1){
1459
if(debug){
1460
ret_errno = errno;
1461
perror_plus("ioctl SIOCGIFFLAGS");
1462
errno = ret_errno;
1463
}
1464
return false;
1465
}
1466
return true;
1467
}
1468
1469
__attribute__((nonnull, warn_unused_result))
1470
bool good_flags(const char *ifname, const struct ifreq *ifr){
1471
1472
/* Reject the loopback device */
1473
if(ifr->ifr_flags & IFF_LOOPBACK){
1474
if(debug){
1475
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1476
ifname);
1477
}
1478
return false;
1479
}
1480
/* Accept point-to-point devices only if connect_to is specified */
1481
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1482
if(debug){
1483
fprintf_plus(stderr, "Accepting point-to-point interface"
1484
" \"%s\"\n", ifname);
1485
}
1486
return true;
1487
}
1488
/* Otherwise, reject non-broadcast-capable devices */
1489
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1490
if(debug){
1491
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1492
" \"%s\"\n", ifname);
1493
}
1494
return false;
1495
}
1496
/* Reject non-ARP interfaces (including dummy interfaces) */
1497
if(ifr->ifr_flags & IFF_NOARP){
1498
if(debug){
1499
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1500
ifname);
1501
}
1502
return false;
1503
}
1504
1505
/* Accept this device */
1506
if(debug){
1507
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1508
}
1509
return true;
1510
}
1511
1088
1512
/*
1089
1513
* This function determines if a directory entry in /sys/class/net
1090
1514
* corresponds to an acceptable network device.
1091
1515
* (This function is passed to scandir(3) as a filter function.)
1092
1516
*/
1517
__attribute__((nonnull, warn_unused_result))
1093
1518
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
char *flagname = NULL;
1096
1519
if(if_entry->d_name[0] == '.'){
1097
1520
return 0;
1098
1521
}
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1100
if_entry->d_name);
1101
if(ret < 0){
1102
perror_plus("asprintf");
1103
return 0;
1104
}
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
if(flags_fd == -1){
1107
perror_plus("open");
1108
free(flagname);
1109
return 0;
1110
}
1111
free(flagname);
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
flagstring[(size_t)to_read] = '\0';
1117
if(flagstring == NULL){
1118
perror_plus("malloc");
1119
close(flags_fd);
1120
return 0;
1121
}
1122
while(to_read > 0){
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1124
(size_t)to_read));
1125
if(ssret == -1){
1126
perror_plus("read");
1127
free(flagstring);
1128
close(flags_fd);
1129
return 0;
1130
}
1131
to_read -= ssret;
1132
if(ssret == 0){
1133
break;
1134
}
1135
}
1136
close(flags_fd);
1137
intmax_t tmpmax;
1138
char *tmp;
1139
errno = 0;
1140
tmpmax = strtoimax(flagstring, &tmp, 0);
1141
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1142
and not (isspace(*tmp)))
1143
or tmpmax != (ifreq_flags)tmpmax){
1144
if(debug){
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1147
}
1148
free(flagstring);
1149
return 0;
1150
}
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1153
/* Reject the loopback device */
1154
if(flags & IFF_LOOPBACK){
1155
if(debug){
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1158
}
1159
return 0;
1160
}
1161
/* Accept point-to-point devices only if connect_to is specified */
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1163
if(debug){
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 1;
1168
}
1169
/* Otherwise, reject non-broadcast-capable devices */
1170
if(not (flags & IFF_BROADCAST)){
1171
if(debug){
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1174
}
1175
return 0;
1176
}
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1178
if(flags & IFF_NOARP){
1179
if(debug){
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1182
}
1183
return 0;
1184
}
1185
/* Accept this device */
1186
if(debug){
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
1522
1523
struct ifreq ifr;
1524
if(not get_flags(if_entry->d_name, &ifr)){
1525
if(debug){
1526
fprintf_plus(stderr, "Failed to get flags for interface "
1527
"\"%s\"\n", if_entry->d_name);
1528
}
1529
return 0;
1530
}
1531
1532
if(not good_flags(if_entry->d_name, &ifr)){
1533
return 0;
1189
1534
}
1190
1535
return 1;
1191
1536
}
1192
1537
1538
/*
1539
* This function determines if a network interface is up.
1540
*/
1541
__attribute__((nonnull, warn_unused_result))
1542
bool interface_is_up(const char *interface){
1543
struct ifreq ifr;
1544
if(not get_flags(interface, &ifr)){
1545
if(debug){
1546
fprintf_plus(stderr, "Failed to get flags for interface "
1547
"\"%s\"\n", interface);
1548
}
1549
return false;
1550
}
1551
1552
return (bool)(ifr.ifr_flags & IFF_UP);
1553
}
1554
1555
/*
1556
* This function determines if a network interface is running
1557
*/
1558
__attribute__((nonnull, warn_unused_result))
1559
bool interface_is_running(const char *interface){
1560
struct ifreq ifr;
1561
if(not get_flags(interface, &ifr)){
1562
if(debug){
1563
fprintf_plus(stderr, "Failed to get flags for interface "
1564
"\"%s\"\n", interface);
1565
}
1566
return false;
1567
}
1568
1569
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1570
}
1571
1572
__attribute__((nonnull, pure, warn_unused_result))
1193
1573
int notdotentries(const struct dirent *direntry){
1194
1574
/* Skip "." and ".." */
1195
1575
if(direntry->d_name[0] == '.'
1201
1581
return 1;
1202
1582
}
1203
1583
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1584
/* Is this directory entry a runnable program? */
1585
__attribute__((nonnull, warn_unused_result))
1586
int runnable_hook(const struct dirent *direntry){
1587
int ret;
1588
size_t sret;
1589
struct stat st;
1590
1591
if((direntry->d_name)[0] == '\0'){
1592
/* Empty name? */
1593
return 0;
1594
}
1595
1596
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1597
"abcdefghijklmnopqrstuvwxyz"
1598
"0123456789"
1599
"_.-");
1600
if((direntry->d_name)[sret] != '\0'){
1601
/* Contains non-allowed characters */
1602
if(debug){
1603
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1604
direntry->d_name);
1605
}
1606
return 0;
1607
}
1608
1609
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1610
if(ret == -1){
1611
if(debug){
1612
perror_plus("Could not stat hook");
1613
}
1614
return 0;
1615
}
1616
if(not (S_ISREG(st.st_mode))){
1617
/* Not a regular file */
1618
if(debug){
1619
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1620
direntry->d_name);
1621
}
1622
return 0;
1623
}
1624
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1625
/* Not executable */
1626
if(debug){
1627
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1628
direntry->d_name);
1629
}
1630
return 0;
1631
}
1632
if(debug){
1633
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1634
direntry->d_name);
1635
}
1636
return 1;
1637
}
1638
1639
__attribute__((nonnull, warn_unused_result))
1640
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1641
mandos_context *mc){
1205
1642
int ret;
1206
1643
struct timespec now;
1207
1644
struct timespec waited_time;
1208
1645
intmax_t block_time;
1209
1646
1210
1647
while(true){
1211
if(mc.current_server == NULL){
1212
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1648
if(mc->current_server == NULL){
1649
if(debug){
1650
fprintf_plus(stderr, "Wait until first server is found."
1651
" No timeout!\n");
1215
1652
}
1216
1653
ret = avahi_simple_poll_iterate(s, -1);
1217
1654
} else {
1218
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1655
if(debug){
1656
fprintf_plus(stderr, "Check current_server if we should run"
1657
" it, or wait\n");
1221
1658
}
1222
1659
/* the current time */
1223
1660
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1228
1665
/* Calculating in ms how long time between now and server
1229
1666
who we visted longest time ago. Now - last seen. */
1230
1667
waited_time.tv_sec = (now.tv_sec
1231
- mc.current_server->last_seen.tv_sec);
1668
- mc->current_server->last_seen.tv_sec);
1232
1669
waited_time.tv_nsec = (now.tv_nsec
1233
- mc.current_server->last_seen.tv_nsec);
1670
- mc->current_server->last_seen.tv_nsec);
1234
1671
/* total time is 10s/10,000ms.
1235
1672
Converting to s from ms by dividing by 1,000,
1236
1673
and ns to ms by dividing by 1,000,000. */
1238
1675
- ((intmax_t)waited_time.tv_sec * 1000))
1239
1676
- ((intmax_t)waited_time.tv_nsec / 1000000));
1240
1677
1241
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1678
if(debug){
1679
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1680
block_time);
1243
1681
}
1244
1682
1245
1683
if(block_time <= 0){
1246
ret = start_mandos_communication(mc.current_server->ip,
1247
mc.current_server->port,
1248
mc.current_server->if_index,
1249
mc.current_server->af);
1684
ret = start_mandos_communication(mc->current_server->ip,
1685
mc->current_server->port,
1686
mc->current_server->if_index,
1687
mc->current_server->af, mc);
1250
1688
if(ret == 0){
1251
avahi_simple_poll_quit(mc.simple_poll);
1689
avahi_simple_poll_quit(s);
1252
1690
return 0;
1253
1691
}
1254
1692
ret = clock_gettime(CLOCK_MONOTONIC,
1255
&mc.current_server->last_seen);
1693
&mc->current_server->last_seen);
1256
1694
if(ret == -1){
1257
1695
perror_plus("clock_gettime");
1258
1696
return -1;
1259
1697
}
1260
mc.current_server = mc.current_server->next;
1698
mc->current_server = mc->current_server->next;
1261
1699
block_time = 0; /* Call avahi to find new Mandos
1262
1700
servers, but don't block */
1263
1701
}
1265
1703
ret = avahi_simple_poll_iterate(s, (int)block_time);
1266
1704
}
1267
1705
if(ret != 0){
1268
if (ret > 0 or errno != EINTR) {
1706
if(ret > 0 or errno != EINTR){
1269
1707
return (ret != 1) ? ret : 0;
1270
1708
}
1271
1709
}
1272
1710
}
1273
1711
}
1274
1712
1713
__attribute__((nonnull))
1714
void run_network_hooks(const char *mode, const char *interface,
1715
const float delay){
1716
struct dirent **direntries = NULL;
1717
if(hookdir_fd == -1){
1718
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1719
| O_CLOEXEC);
1720
if(hookdir_fd == -1){
1721
if(errno == ENOENT){
1722
if(debug){
1723
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1724
" found\n", hookdir);
1725
}
1726
} else {
1727
perror_plus("open");
1728
}
1729
return;
1730
}
1731
}
1732
#ifdef __GLIBC__
1733
#if __GLIBC_PREREQ(2, 15)
1734
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1735
runnable_hook, alphasort);
1736
#else /* not __GLIBC_PREREQ(2, 15) */
1737
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1738
alphasort);
1739
#endif /* not __GLIBC_PREREQ(2, 15) */
1740
#else /* not __GLIBC__ */
1741
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1742
alphasort);
1743
#endif /* not __GLIBC__ */
1744
if(numhooks == -1){
1745
perror_plus("scandir");
1746
return;
1747
}
1748
struct dirent *direntry;
1749
int ret;
1750
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1751
if(devnull == -1){
1752
perror_plus("open(\"/dev/null\", O_RDONLY)");
1753
return;
1754
}
1755
for(int i = 0; i < numhooks; i++){
1756
direntry = direntries[i];
1757
if(debug){
1758
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1759
direntry->d_name);
1760
}
1761
pid_t hook_pid = fork();
1762
if(hook_pid == 0){
1763
/* Child */
1764
/* Raise privileges */
1765
errno = raise_privileges_permanently();
1766
if(errno != 0){
1767
perror_plus("Failed to raise privileges");
1768
_exit(EX_NOPERM);
1769
}
1770
/* Set group */
1771
errno = 0;
1772
ret = setgid(0);
1773
if(ret == -1){
1774
perror_plus("setgid");
1775
_exit(EX_NOPERM);
1776
}
1777
/* Reset supplementary groups */
1778
errno = 0;
1779
ret = setgroups(0, NULL);
1780
if(ret == -1){
1781
perror_plus("setgroups");
1782
_exit(EX_NOPERM);
1783
}
1784
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1785
if(ret == -1){
1786
perror_plus("setenv");
1787
_exit(EX_OSERR);
1788
}
1789
ret = setenv("DEVICE", interface, 1);
1790
if(ret == -1){
1791
perror_plus("setenv");
1792
_exit(EX_OSERR);
1793
}
1794
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1795
if(ret == -1){
1796
perror_plus("setenv");
1797
_exit(EX_OSERR);
1798
}
1799
ret = setenv("MODE", mode, 1);
1800
if(ret == -1){
1801
perror_plus("setenv");
1802
_exit(EX_OSERR);
1803
}
1804
char *delaystring;
1805
ret = asprintf(&delaystring, "%f", (double)delay);
1806
if(ret == -1){
1807
perror_plus("asprintf");
1808
_exit(EX_OSERR);
1809
}
1810
ret = setenv("DELAY", delaystring, 1);
1811
if(ret == -1){
1812
free(delaystring);
1813
perror_plus("setenv");
1814
_exit(EX_OSERR);
1815
}
1816
free(delaystring);
1817
if(connect_to != NULL){
1818
ret = setenv("CONNECT", connect_to, 1);
1819
if(ret == -1){
1820
perror_plus("setenv");
1821
_exit(EX_OSERR);
1822
}
1823
}
1824
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1825
direntry->d_name,
1826
O_RDONLY));
1827
if(hook_fd == -1){
1828
perror_plus("openat");
1829
_exit(EXIT_FAILURE);
1830
}
1831
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1832
perror_plus("close");
1833
_exit(EXIT_FAILURE);
1834
}
1835
ret = dup2(devnull, STDIN_FILENO);
1836
if(ret == -1){
1837
perror_plus("dup2(devnull, STDIN_FILENO)");
1838
_exit(EX_OSERR);
1839
}
1840
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1841
if(ret == -1){
1842
perror_plus("close");
1843
_exit(EX_OSERR);
1844
}
1845
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1846
if(ret == -1){
1847
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1848
_exit(EX_OSERR);
1849
}
1850
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1851
environ) == -1){
1852
perror_plus("fexecve");
1853
_exit(EXIT_FAILURE);
1854
}
1855
} else {
1856
if(hook_pid == -1){
1857
perror_plus("fork");
1858
free(direntry);
1859
continue;
1860
}
1861
int status;
1862
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1863
perror_plus("waitpid");
1864
free(direntry);
1865
continue;
1866
}
1867
if(WIFEXITED(status)){
1868
if(WEXITSTATUS(status) != 0){
1869
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1870
" with status %d\n", direntry->d_name,
1871
WEXITSTATUS(status));
1872
free(direntry);
1873
continue;
1874
}
1875
} else if(WIFSIGNALED(status)){
1876
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1877
" signal %d\n", direntry->d_name,
1878
WTERMSIG(status));
1879
free(direntry);
1880
continue;
1881
} else {
1882
fprintf_plus(stderr, "Warning: network hook \"%s\""
1883
" crashed\n", direntry->d_name);
1884
free(direntry);
1885
continue;
1886
}
1887
}
1888
if(debug){
1889
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1890
direntry->d_name);
1891
}
1892
free(direntry);
1893
}
1894
free(direntries);
1895
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1896
perror_plus("close");
1897
} else {
1898
hookdir_fd = -1;
1899
}
1900
close(devnull);
1901
}
1902
1903
__attribute__((nonnull, warn_unused_result))
1904
error_t bring_up_interface(const char *const interface,
1905
const float delay){
1906
error_t old_errno = errno;
1907
int ret;
1908
struct ifreq network;
1909
unsigned int if_index = if_nametoindex(interface);
1910
if(if_index == 0){
1911
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1912
errno = old_errno;
1913
return ENXIO;
1914
}
1915
1916
if(quit_now){
1917
errno = old_errno;
1918
return EINTR;
1919
}
1920
1921
if(not interface_is_up(interface)){
1922
error_t ret_errno = 0, ioctl_errno = 0;
1923
if(not get_flags(interface, &network)){
1924
ret_errno = errno;
1925
fprintf_plus(stderr, "Failed to get flags for interface "
1926
"\"%s\"\n", interface);
1927
errno = old_errno;
1928
return ret_errno;
1929
}
1930
network.ifr_flags |= IFF_UP; /* set flag */
1931
1932
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
if(sd == -1){
1934
ret_errno = errno;
1935
perror_plus("socket");
1936
errno = old_errno;
1937
return ret_errno;
1938
}
1939
1940
if(quit_now){
1941
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1942
if(ret == -1){
1943
perror_plus("close");
1944
}
1945
errno = old_errno;
1946
return EINTR;
1947
}
1948
1949
if(debug){
1950
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1951
interface);
1952
}
1953
1954
/* Raise privileges */
1955
ret_errno = raise_privileges();
1956
if(ret_errno != 0){
1957
errno = ret_errno;
1958
perror_plus("Failed to raise privileges");
1959
}
1960
1961
#ifdef __linux__
1962
int ret_linux;
1963
bool restore_loglevel = false;
1964
if(ret_errno == 0){
1965
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1966
messages about the network interface to mess up the prompt */
1967
ret_linux = klogctl(8, NULL, 5);
1968
if(ret_linux == -1){
1969
perror_plus("klogctl");
1970
} else {
1971
restore_loglevel = true;
1972
}
1973
}
1974
#endif /* __linux__ */
1975
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1976
ioctl_errno = errno;
1977
#ifdef __linux__
1978
if(restore_loglevel){
1979
ret_linux = klogctl(7, NULL, 0);
1980
if(ret_linux == -1){
1981
perror_plus("klogctl");
1982
}
1983
}
1984
#endif /* __linux__ */
1985
1986
/* If raise_privileges() succeeded above */
1987
if(ret_errno == 0){
1988
/* Lower privileges */
1989
ret_errno = lower_privileges();
1990
if(ret_errno != 0){
1991
errno = ret_errno;
1992
perror_plus("Failed to lower privileges");
1993
}
1994
}
1995
1996
/* Close the socket */
1997
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1998
if(ret == -1){
1999
perror_plus("close");
2000
}
2001
2002
if(ret_setflags == -1){
2003
errno = ioctl_errno;
2004
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2005
errno = old_errno;
2006
return ioctl_errno;
2007
}
2008
} else if(debug){
2009
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2010
interface);
2011
}
2012
2013
/* Sleep checking until interface is running.
2014
Check every 0.25s, up to total time of delay */
2015
for(int i=0; i < delay * 4; i++){
2016
if(interface_is_running(interface)){
2017
break;
2018
}
2019
struct timespec sleeptime = { .tv_nsec = 250000000 };
2020
ret = nanosleep(&sleeptime, NULL);
2021
if(ret == -1 and errno != EINTR){
2022
perror_plus("nanosleep");
2023
}
2024
}
2025
2026
errno = old_errno;
2027
return 0;
2028
}
2029
2030
__attribute__((nonnull, warn_unused_result))
2031
error_t take_down_interface(const char *const interface){
2032
error_t old_errno = errno;
2033
struct ifreq network;
2034
unsigned int if_index = if_nametoindex(interface);
2035
if(if_index == 0){
2036
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2037
errno = old_errno;
2038
return ENXIO;
2039
}
2040
if(interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2042
if(not get_flags(interface, &network) and debug){
2043
ret_errno = errno;
2044
fprintf_plus(stderr, "Failed to get flags for interface "
2045
"\"%s\"\n", interface);
2046
errno = old_errno;
2047
return ret_errno;
2048
}
2049
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2050
2051
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2052
if(sd == -1){
2053
ret_errno = errno;
2054
perror_plus("socket");
2055
errno = old_errno;
2056
return ret_errno;
2057
}
2058
2059
if(debug){
2060
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2061
interface);
2062
}
2063
2064
/* Raise privileges */
2065
ret_errno = raise_privileges();
2066
if(ret_errno != 0){
2067
errno = ret_errno;
2068
perror_plus("Failed to raise privileges");
2069
}
2070
2071
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2072
ioctl_errno = errno;
2073
2074
/* If raise_privileges() succeeded above */
2075
if(ret_errno == 0){
2076
/* Lower privileges */
2077
ret_errno = lower_privileges();
2078
if(ret_errno != 0){
2079
errno = ret_errno;
2080
perror_plus("Failed to lower privileges");
2081
}
2082
}
2083
2084
/* Close the socket */
2085
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2086
if(ret == -1){
2087
perror_plus("close");
2088
}
2089
2090
if(ret_setflags == -1){
2091
errno = ioctl_errno;
2092
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2093
errno = old_errno;
2094
return ioctl_errno;
2095
}
2096
} else if(debug){
2097
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2098
interface);
2099
}
2100
2101
errno = old_errno;
2102
return 0;
2103
}
2104
1275
2105
int main(int argc, char *argv[]){
2106
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2107
.priority = "SECURE256:!CTYPE-X.509:"
2108
"+CTYPE-OPENPGP", .current_server = NULL,
2109
.interfaces = NULL, .interfaces_size = 0 };
1276
2110
AvahiSServiceBrowser *sb = NULL;
1277
int error;
2111
error_t ret_errno;
1278
2112
int ret;
1279
2113
intmax_t tmpmax;
1280
2114
char *tmp;
1281
2115
int exitcode = EXIT_SUCCESS;
1282
const char *interface = "";
1283
struct ifreq network;
1284
int sd = -1;
1285
bool take_down_interface = false;
1286
uid_t uid;
1287
gid_t gid;
1288
char tempdir[] = "/tmp/mandosXXXXXX";
1289
bool tempdir_created = false;
2116
char *interfaces_to_take_down = NULL;
2117
size_t interfaces_to_take_down_size = 0;
2118
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2119
char old_tempdir[] = "/tmp/mandosXXXXXX";
2120
char *tempdir = NULL;
1290
2121
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1291
2122
const char *seckey = PATHDIR "/" SECKEY;
1292
2123
const char *pubkey = PATHDIR "/" PUBKEY;
2124
char *interfaces_hooks = NULL;
1293
2125
1294
2126
bool gnutls_initialized = false;
1295
2127
bool gpgme_initialized = false;
1357
2189
.group = 2 },
1358
2190
{ .name = "retry", .key = 132,
1359
2191
.arg = "SECONDS",
1360
.doc = "Retry interval used when denied by the mandos server",
2192
.doc = "Retry interval used when denied by the Mandos server",
2193
.group = 2 },
2194
{ .name = "network-hook-dir", .key = 133,
2195
.arg = "DIR",
2196
.doc = "Directory where network hooks are located",
1361
2197
.group = 2 },
1362
2198
/*
1363
2199
* These reproduce what we would get without ARGP_NO_HELP
1382
2218
connect_to = arg;
1383
2219
break;
1384
2220
case 'i': /* --interface */
1385
interface = arg;
2221
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2222
arg, (int)',');
2223
if(ret_errno != 0){
2224
argp_error(state, "%s", strerror(ret_errno));
2225
}
1386
2226
break;
1387
2227
case 's': /* --seckey */
1388
2228
seckey = arg;
1417
2257
argp_error(state, "Bad retry interval");
1418
2258
}
1419
2259
break;
2260
case 133: /* --network-hook-dir */
2261
hookdir = arg;
2262
break;
1420
2263
/*
1421
2264
* These reproduce what we would get without ARGP_NO_HELP
1422
2265
*/
1428
2271
argp_state_help(state, state->out_stream,
1429
2272
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1430
2273
case 'V': /* --version */
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
2274
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1432
2275
exit(argp_err_exit_status);
1433
2276
break;
1434
2277
default:
1457
2300
goto end;
1458
2301
}
1459
2302
}
1460
2303
1461
2304
{
1462
2305
/* Work around Debian bug #633582:
1463
2306
<http://bugs.debian.org/633582> */
1464
struct stat st;
1465
1466
/* Re-raise priviliges */
1467
errno = 0;
1468
ret = seteuid(0);
1469
if(ret == -1){
1470
perror_plus("seteuid");
1471
}
1472
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1477
} else {
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
if(ret == -1){
1480
perror_plus("fstat");
1481
} else {
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1484
if(ret == -1){
1485
perror_plus("fchown");
1486
}
1487
}
1488
}
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1490
}
1491
}
1492
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1497
} else {
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1499
if(ret == -1){
1500
perror_plus("fstat");
1501
} else {
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1504
if(ret == -1){
1505
perror_plus("fchown");
1506
}
1507
}
1508
}
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1510
}
1511
}
1512
1513
/* Lower privileges */
1514
errno = 0;
1515
ret = seteuid(uid);
1516
if(ret == -1){
1517
perror_plus("seteuid");
1518
}
2307
2308
/* Re-raise privileges */
2309
ret_errno = raise_privileges();
2310
if(ret_errno != 0){
2311
errno = ret_errno;
2312
perror_plus("Failed to raise privileges");
2313
} else {
2314
struct stat st;
2315
2316
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2317
int seckey_fd = open(seckey, O_RDONLY);
2318
if(seckey_fd == -1){
2319
perror_plus("open");
2320
} else {
2321
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2322
if(ret == -1){
2323
perror_plus("fstat");
2324
} else {
2325
if(S_ISREG(st.st_mode)
2326
and st.st_uid == 0 and st.st_gid == 0){
2327
ret = fchown(seckey_fd, uid, gid);
2328
if(ret == -1){
2329
perror_plus("fchown");
2330
}
2331
}
2332
}
2333
TEMP_FAILURE_RETRY(close(seckey_fd));
2334
}
2335
}
2336
2337
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2338
int pubkey_fd = open(pubkey, O_RDONLY);
2339
if(pubkey_fd == -1){
2340
perror_plus("open");
2341
} else {
2342
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2343
if(ret == -1){
2344
perror_plus("fstat");
2345
} else {
2346
if(S_ISREG(st.st_mode)
2347
and st.st_uid == 0 and st.st_gid == 0){
2348
ret = fchown(pubkey_fd, uid, gid);
2349
if(ret == -1){
2350
perror_plus("fchown");
2351
}
2352
}
2353
}
2354
TEMP_FAILURE_RETRY(close(pubkey_fd));
2355
}
2356
}
2357
2358
/* Lower privileges */
2359
ret_errno = lower_privileges();
2360
if(ret_errno != 0){
2361
errno = ret_errno;
2362
perror_plus("Failed to lower privileges");
2363
}
2364
}
2365
}
2366
2367
/* Remove invalid interface names (except "none") */
2368
{
2369
char *interface = NULL;
2370
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2371
interface))){
2372
if(strcmp(interface, "none") != 0
2373
and if_nametoindex(interface) == 0){
2374
if(interface[0] != '\0'){
2375
fprintf_plus(stderr, "Not using nonexisting interface"
2376
" \"%s\"\n", interface);
2377
}
2378
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2379
interface = NULL;
2380
}
2381
}
2382
}
2383
2384
/* Run network hooks */
2385
{
2386
if(mc.interfaces != NULL){
2387
interfaces_hooks = malloc(mc.interfaces_size);
2388
if(interfaces_hooks == NULL){
2389
perror_plus("malloc");
2390
goto end;
2391
}
2392
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2393
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2394
}
2395
run_network_hooks("start", interfaces_hooks != NULL ?
2396
interfaces_hooks : "", delay);
1519
2397
}
1520
2398
1521
2399
if(not debug){
1522
2400
avahi_set_log_function(empty_log);
1523
2401
}
1524
1525
if(interface[0] == '\0'){
1526
struct dirent **direntries;
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1528
alphasort);
1529
if(ret >= 1){
1530
/* Pick the first good interface */
1531
interface = strdup(direntries[0]->d_name);
1532
if(debug){
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1534
}
1535
if(interface == NULL){
1536
perror_plus("malloc");
1537
free(direntries);
1538
exitcode = EXIT_FAILURE;
1539
goto end;
1540
}
1541
free(direntries);
1542
} else {
1543
free(direntries);
1544
fprintf(stderr, "Could not find a network interface\n");
1545
exitcode = EXIT_FAILURE;
1546
goto end;
1547
}
1548
}
1549
2402
1550
2403
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1551
2404
from the signal handler */
1552
2405
/* Initialize the pseudo-RNG for Avahi */
1553
2406
srand((unsigned int) time(NULL));
1554
mc.simple_poll = avahi_simple_poll_new();
1555
if(mc.simple_poll == NULL){
1556
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2407
simple_poll = avahi_simple_poll_new();
2408
if(simple_poll == NULL){
2409
fprintf_plus(stderr,
2410
"Avahi: Failed to create simple poll object.\n");
1557
2411
exitcode = EX_UNAVAILABLE;
1558
2412
goto end;
1559
2413
}
1621
2475
}
1622
2476
}
1623
2477
1624
/* If the interface is down, bring it up */
1625
if(strcmp(interface, "none") != 0){
1626
if_index = (AvahiIfIndex) if_nametoindex(interface);
1627
if(if_index == 0){
1628
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1629
exitcode = EX_UNAVAILABLE;
1630
goto end;
1631
}
1632
1633
if(quit_now){
1634
goto end;
1635
}
1636
1637
/* Re-raise priviliges */
1638
errno = 0;
1639
ret = seteuid(0);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
1644
#ifdef __linux__
1645
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1646
messages about the network interface to mess up the prompt */
1647
ret = klogctl(8, NULL, 5);
1648
bool restore_loglevel = true;
1649
if(ret == -1){
1650
restore_loglevel = false;
1651
perror_plus("klogctl");
1652
}
1653
#endif /* __linux__ */
1654
1655
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1656
if(sd < 0){
1657
perror_plus("socket");
1658
exitcode = EX_OSERR;
1659
#ifdef __linux__
1660
if(restore_loglevel){
1661
ret = klogctl(7, NULL, 0);
1662
if(ret == -1){
1663
perror_plus("klogctl");
1664
}
1665
}
1666
#endif /* __linux__ */
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
goto end;
1674
}
1675
strcpy(network.ifr_name, interface);
1676
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1677
if(ret == -1){
1678
perror_plus("ioctl SIOCGIFFLAGS");
1679
#ifdef __linux__
1680
if(restore_loglevel){
1681
ret = klogctl(7, NULL, 0);
1682
if(ret == -1){
1683
perror_plus("klogctl");
1684
}
1685
}
1686
#endif /* __linux__ */
1687
exitcode = EX_OSERR;
1688
/* Lower privileges */
1689
errno = 0;
1690
ret = seteuid(uid);
1691
if(ret == -1){
1692
perror_plus("seteuid");
1693
}
1694
goto end;
1695
}
1696
if((network.ifr_flags & IFF_UP) == 0){
1697
network.ifr_flags |= IFF_UP;
1698
take_down_interface = true;
1699
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1700
if(ret == -1){
1701
take_down_interface = false;
1702
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1703
exitcode = EX_OSERR;
1704
#ifdef __linux__
1705
if(restore_loglevel){
1706
ret = klogctl(7, NULL, 0);
1707
if(ret == -1){
1708
perror_plus("klogctl");
2478
/* If no interfaces were specified, make a list */
2479
if(mc.interfaces == NULL){
2480
struct dirent **direntries = NULL;
2481
/* Look for any good interfaces */
2482
ret = scandir(sys_class_net, &direntries, good_interface,
2483
alphasort);
2484
if(ret >= 1){
2485
/* Add all found interfaces to interfaces list */
2486
for(int i = 0; i < ret; ++i){
2487
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2488
direntries[i]->d_name);
2489
if(ret_errno != 0){
2490
errno = ret_errno;
2491
perror_plus("argz_add");
2492
free(direntries[i]);
2493
continue;
2494
}
2495
if(debug){
2496
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2497
direntries[i]->d_name);
2498
}
2499
free(direntries[i]);
2500
}
2501
free(direntries);
2502
} else {
2503
if(ret == 0){
2504
free(direntries);
2505
}
2506
fprintf_plus(stderr, "Could not find a network interface\n");
2507
exitcode = EXIT_FAILURE;
2508
goto end;
2509
}
2510
}
2511
2512
/* Bring up interfaces which are down, and remove any "none"s */
2513
{
2514
char *interface = NULL;
2515
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2516
interface))){
2517
/* If interface name is "none", stop bringing up interfaces.
2518
Also remove all instances of "none" from the list */
2519
if(strcmp(interface, "none") == 0){
2520
argz_delete(&mc.interfaces, &mc.interfaces_size,
2521
interface);
2522
interface = NULL;
2523
while((interface = argz_next(mc.interfaces,
2524
mc.interfaces_size, interface))){
2525
if(strcmp(interface, "none") == 0){
2526
argz_delete(&mc.interfaces, &mc.interfaces_size,
2527
interface);
2528
interface = NULL;
1709
2529
}
1710
2530
}
1711
#endif /* __linux__ */
1712
/* Lower privileges */
1713
errno = 0;
1714
ret = seteuid(uid);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
}
1718
goto end;
1719
}
1720
}
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
1724
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1725
if(ret == -1){
1726
perror_plus("ioctl SIOCGIFFLAGS");
1727
} else if(network.ifr_flags & IFF_RUNNING){
1728
2531
break;
1729
2532
}
1730
struct timespec sleeptime = { .tv_nsec = 250000000 };
1731
ret = nanosleep(&sleeptime, NULL);
1732
if(ret == -1 and errno != EINTR){
1733
perror_plus("nanosleep");
1734
}
1735
}
1736
if(not take_down_interface){
1737
/* We won't need the socket anymore */
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
if(ret == -1){
1740
perror_plus("close");
1741
}
1742
}
1743
#ifdef __linux__
1744
if(restore_loglevel){
1745
/* Restores kernel loglevel to default */
1746
ret = klogctl(7, NULL, 0);
1747
if(ret == -1){
1748
perror_plus("klogctl");
1749
}
1750
}
1751
#endif /* __linux__ */
1752
/* Lower privileges */
1753
errno = 0;
1754
if(take_down_interface){
1755
/* Lower privileges */
1756
ret = seteuid(uid);
1757
if(ret == -1){
1758
perror_plus("seteuid");
1759
}
1760
} else {
1761
/* Lower privileges permanently */
1762
ret = setuid(uid);
1763
if(ret == -1){
1764
perror_plus("setuid");
1765
}
1766
}
2533
bool interface_was_up = interface_is_up(interface);
2534
errno = bring_up_interface(interface, delay);
2535
if(not interface_was_up){
2536
if(errno != 0){
2537
perror_plus("Failed to bring up interface");
2538
} else {
2539
errno = argz_add(&interfaces_to_take_down,
2540
&interfaces_to_take_down_size,
2541
interface);
2542
if(errno != 0){
2543
perror_plus("argz_add");
2544
}
2545
}
2546
}
2547
}
2548
if(debug and (interfaces_to_take_down == NULL)){
2549
fprintf_plus(stderr, "No interfaces were brought up\n");
2550
}
2551
}
2552
2553
/* If we only got one interface, explicitly use only that one */
2554
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2555
if(debug){
2556
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2557
mc.interfaces);
2558
}
2559
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1767
2560
}
1768
2561
1769
2562
if(quit_now){
1770
2563
goto end;
1771
2564
}
1772
2565
1773
ret = init_gnutls_global(pubkey, seckey);
2566
ret = init_gnutls_global(pubkey, seckey, &mc);
1774
2567
if(ret == -1){
1775
fprintf(stderr, "init_gnutls_global failed\n");
2568
fprintf_plus(stderr, "init_gnutls_global failed\n");
1776
2569
exitcode = EX_UNAVAILABLE;
1777
2570
goto end;
1778
2571
} else {
1783
2576
goto end;
1784
2577
}
1785
2578
1786
if(mkdtemp(tempdir) == NULL){
2579
/* Try /run/tmp before /tmp */
2580
tempdir = mkdtemp(run_tempdir);
2581
if(tempdir == NULL and errno == ENOENT){
2582
if(debug){
2583
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2584
run_tempdir, old_tempdir);
2585
}
2586
tempdir = mkdtemp(old_tempdir);
2587
}
2588
if(tempdir == NULL){
1787
2589
perror_plus("mkdtemp");
1788
2590
goto end;
1789
2591
}
1790
tempdir_created = true;
1791
2592
1792
2593
if(quit_now){
1793
2594
goto end;
1794
2595
}
1795
2596
1796
if(not init_gpgme(pubkey, seckey, tempdir)){
1797
fprintf(stderr, "init_gpgme failed\n");
2597
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2598
fprintf_plus(stderr, "init_gpgme failed\n");
1798
2599
exitcode = EX_UNAVAILABLE;
1799
2600
goto end;
1800
2601
} else {
1809
2610
/* Connect directly, do not use Zeroconf */
1810
2611
/* (Mainly meant for debugging) */
1811
2612
char *address = strrchr(connect_to, ':');
2613
1812
2614
if(address == NULL){
1813
fprintf(stderr, "No colon in address\n");
2615
fprintf_plus(stderr, "No colon in address\n");
1814
2616
exitcode = EX_USAGE;
1815
2617
goto end;
1816
2618
}
1819
2621
goto end;
1820
2622
}
1821
2623
1822
uint16_t port;
2624
in_port_t port;
1823
2625
errno = 0;
1824
2626
tmpmax = strtoimax(address+1, &tmp, 10);
1825
2627
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1826
or tmpmax != (uint16_t)tmpmax){
1827
fprintf(stderr, "Bad port number\n");
2628
or tmpmax != (in_port_t)tmpmax){
2629
fprintf_plus(stderr, "Bad port number\n");
1828
2630
exitcode = EX_USAGE;
1829
2631
goto end;
1830
2632
}
1831
2633
1832
2634
if(quit_now){
1833
2635
goto end;
1834
2636
}
1835
2637
1836
port = (uint16_t)tmpmax;
2638
port = (in_port_t)tmpmax;
1837
2639
*address = '\0';
1838
2640
/* Colon in address indicates IPv6 */
1839
2641
int af;
1855
2657
}
1856
2658
1857
2659
while(not quit_now){
1858
ret = start_mandos_communication(address, port, if_index, af);
2660
ret = start_mandos_communication(address, port, if_index, af,
2661
&mc);
1859
2662
if(quit_now or ret == 0){
1860
2663
break;
1861
2664
}
1862
2665
if(debug){
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
2666
fprintf_plus(stderr, "Retrying in %d seconds\n",
2667
(int)retry_interval);
1865
2668
}
1866
sleep((int)retry_interval);
2669
sleep((unsigned int)retry_interval);
1867
2670
}
1868
2671
1869
if (not quit_now){
2672
if(not quit_now){
1870
2673
exitcode = EXIT_SUCCESS;
1871
2674
}
1872
2675
1873
2676
goto end;
1874
2677
}
1875
2678
1887
2690
config.publish_domain = 0;
1888
2691
1889
2692
/* Allocate a new server */
1890
mc.server = avahi_server_new(avahi_simple_poll_get
1891
(mc.simple_poll), &config, NULL,
1892
NULL, &error);
2693
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2694
&config, NULL, NULL, &ret_errno);
1893
2695
1894
2696
/* Free the Avahi configuration data */
1895
2697
avahi_server_config_free(&config);
1897
2699
1898
2700
/* Check if creating the Avahi server object succeeded */
1899
2701
if(mc.server == NULL){
1900
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
avahi_strerror(error));
2702
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2703
avahi_strerror(ret_errno));
1902
2704
exitcode = EX_UNAVAILABLE;
1903
2705
goto end;
1904
2706
}
1910
2712
/* Create the Avahi service browser */
1911
2713
sb = avahi_s_service_browser_new(mc.server, if_index,
1912
2714
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1913
NULL, 0, browse_callback, NULL);
2715
NULL, 0, browse_callback,
2716
(void *)&mc);
1914
2717
if(sb == NULL){
1915
fprintf(stderr, "Failed to create service browser: %s\n",
1916
avahi_strerror(avahi_server_errno(mc.server)));
2718
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2719
avahi_strerror(avahi_server_errno(mc.server)));
1917
2720
exitcode = EX_UNAVAILABLE;
1918
2721
goto end;
1919
2722
}
1925
2728
/* Run the main loop */
1926
2729
1927
2730
if(debug){
1928
fprintf(stderr, "Starting Avahi loop search\n");
2731
fprintf_plus(stderr, "Starting Avahi loop search\n");
1929
2732
}
1930
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
(int)(retry_interval * 1000));
2733
2734
ret = avahi_loop_with_timeout(simple_poll,
2735
(int)(retry_interval * 1000), &mc);
1933
2736
if(debug){
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
2737
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2738
(ret == 0) ? "successfully" : "with error");
1936
2739
}
1937
2740
1938
2741
end:
1939
2742
1940
2743
if(debug){
1941
fprintf(stderr, "%s exiting\n", argv[0]);
2744
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1942
2745
}
1943
2746
1944
2747
/* Cleanup things */
2748
free(mc.interfaces);
2749
1945
2750
if(sb != NULL)
1946
2751
avahi_s_service_browser_free(sb);
1947
2752
1948
2753
if(mc.server != NULL)
1949
2754
avahi_server_free(mc.server);
1950
2755
1951
if(mc.simple_poll != NULL)
1952
avahi_simple_poll_free(mc.simple_poll);
2756
if(simple_poll != NULL)
2757
avahi_simple_poll_free(simple_poll);
1953
2758
1954
2759
if(gnutls_initialized){
1955
2760
gnutls_certificate_free_credentials(mc.cred);
1960
2765
if(gpgme_initialized){
1961
2766
gpgme_release(mc.ctx);
1962
2767
}
1963
2768
1964
2769
/* Cleans up the circular linked list of Mandos servers the client
1965
2770
has seen */
1966
2771
if(mc.current_server != NULL){
1967
2772
mc.current_server->prev->next = NULL;
1968
2773
while(mc.current_server != NULL){
1969
2774
server *next = mc.current_server->next;
2775
#ifdef __GNUC__
2776
#pragma GCC diagnostic push
2777
#pragma GCC diagnostic ignored "-Wcast-qual"
2778
#endif
2779
free((char *)(mc.current_server->ip));
2780
#ifdef __GNUC__
2781
#pragma GCC diagnostic pop
2782
#endif
1970
2783
free(mc.current_server);
1971
2784
mc.current_server = next;
1972
2785
}
1973
2786
}
1974
2787
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
1978
errno = 0;
1979
ret = seteuid(0);
1980
if(ret == -1){
1981
perror_plus("seteuid");
2788
/* Re-raise privileges */
2789
{
2790
ret_errno = raise_privileges();
2791
if(ret_errno != 0){
2792
errno = ret_errno;
2793
perror_plus("Failed to raise privileges");
2794
} else {
2795
2796
/* Run network hooks */
2797
run_network_hooks("stop", interfaces_hooks != NULL ?
2798
interfaces_hooks : "", delay);
2799
2800
/* Take down the network interfaces which were brought up */
2801
{
2802
char *interface = NULL;
2803
while((interface=argz_next(interfaces_to_take_down,
2804
interfaces_to_take_down_size,
2805
interface))){
2806
ret_errno = take_down_interface(interface);
2807
if(ret_errno != 0){
2808
errno = ret_errno;
2809
perror_plus("Failed to take down interface");
2810
}
2811
}
2812
if(debug and (interfaces_to_take_down == NULL)){
2813
fprintf_plus(stderr, "No interfaces needed to be taken"
2814
" down\n");
2815
}
2816
}
1982
2817
}
1983
if(geteuid() == 0){
1984
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1985
if(ret == -1){
1986
perror_plus("ioctl SIOCGIFFLAGS");
1987
} else if(network.ifr_flags & IFF_UP) {
1988
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1989
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1990
if(ret == -1){
1991
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1992
}
1993
}
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
if(ret == -1){
1996
perror_plus("close");
1997
}
1998
/* Lower privileges permanently */
1999
errno = 0;
2000
ret = setuid(uid);
2001
if(ret == -1){
2002
perror_plus("setuid");
2003
}
2818
2819
ret_errno = lower_privileges_permanently();
2820
if(ret_errno != 0){
2821
errno = ret_errno;
2822
perror_plus("Failed to lower privileges permanently");
2004
2823
}
2005
2824
}
2006
2825
2826
free(interfaces_to_take_down);
2827
free(interfaces_hooks);
2828
2007
2829
/* Removes the GPGME temp directory and all files inside */
2008
if(tempdir_created){
2830
if(tempdir != NULL){
2009
2831
struct dirent **direntries = NULL;
2010
struct dirent *direntry = NULL;
2011
int numentries = scandir(tempdir, &direntries, notdotentries,
2012
alphasort);
2013
if (numentries > 0){
2014
for(int i = 0; i < numentries; i++){
2015
direntry = direntries[i];
2016
char *fullname = NULL;
2017
ret = asprintf(&fullname, "%s/%s", tempdir,
2018
direntry->d_name);
2019
if(ret < 0){
2020
perror_plus("asprintf");
2021
continue;
2022
}
2023
ret = remove(fullname);
2024
if(ret == -1){
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2026
strerror(errno));
2027
}
2028
free(fullname);
2832
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2833
| O_NOFOLLOW
2834
| O_DIRECTORY
2835
| O_PATH));
2836
if(tempdir_fd == -1){
2837
perror_plus("open");
2838
} else {
2839
#ifdef __GLIBC__
2840
#if __GLIBC_PREREQ(2, 15)
2841
int numentries = scandirat(tempdir_fd, ".", &direntries,
2842
notdotentries, alphasort);
2843
#else /* not __GLIBC_PREREQ(2, 15) */
2844
int numentries = scandir(tempdir, &direntries, notdotentries,
2845
alphasort);
2846
#endif /* not __GLIBC_PREREQ(2, 15) */
2847
#else /* not __GLIBC__ */
2848
int numentries = scandir(tempdir, &direntries, notdotentries,
2849
alphasort);
2850
#endif /* not __GLIBC__ */
2851
if(numentries >= 0){
2852
for(int i = 0; i < numentries; i++){
2853
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2854
if(ret == -1){
2855
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2856
" \"%s\", 0): %s\n", tempdir,
2857
direntries[i]->d_name, strerror(errno));
2858
}
2859
free(direntries[i]);
2860
}
2861
2862
/* need to clean even if 0 because man page doesn't specify */
2863
free(direntries);
2864
if(numentries == -1){
2865
perror_plus("scandir");
2866
}
2867
ret = rmdir(tempdir);
2868
if(ret == -1 and errno != ENOENT){
2869
perror_plus("rmdir");
2870
}
2029
2871
}
2030
}
2031
2032
/* need to clean even if 0 because man page doesn't specify */
2033
free(direntries);
2034
if (numentries == -1){
2035
perror_plus("scandir");
2036
}
2037
ret = rmdir(tempdir);
2038
if(ret == -1 and errno != ENOENT){
2039
perror_plus("rmdir");
2872
TEMP_FAILURE_RETRY(close(tempdir_fd));
2040
2873
}
2041
2874
}
2042
2875
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0