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- Committer: Teddy Hogeborn
- Date: 2009-11-03 00:12:35 UTC
- Revision ID: teddy@fukt.bsnet.se-20091103001235-op9jfvtx6xvxch3h
* README (FAQ): Fix typo.
* mandos (main): Try to always do cleanup() before exit, since
otherwise the D-Bus bus name gets unregistered first.
* mandos (main): Try to always do cleanup() before exit, since
otherwise the D-Bus bus name gets unregistered first.
- files removed:
- DBUS-API
- debian/source
- 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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
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(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
79
77
#include <iso646.h> /* not, or, and */
80
78
#include <argp.h> /* struct argp_option, error_t, struct
81
79
argp_state, struct argp,
86
84
raise() */
87
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
86
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() */
98
87
99
88
#ifdef __linux__
100
89
#include <sys/klog.h> /* klogctl() */
118
107
init_gnutls_session(),
119
108
GNUTLS_* */
120
109
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
123
112
124
113
/* GPGME */
125
114
#include <gpgme.h> /* All GPGME types, constants and
133
122
#define PATHDIR "/conf/conf.d/mandos"
134
123
#define SECKEY "seckey.txt"
135
124
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
125
138
126
bool debug = false;
139
127
static const char mandos_protocol_version[] = "1";
140
128
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
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;
148
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
151
const char *ip;
152
in_port_t port;
153
AvahiIfIndex if_index;
154
int af;
155
struct timespec last_seen;
156
struct server *next;
157
struct server *prev;
158
} server;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
159
130
160
131
/* Used for passing in values through the Avahi callback functions */
161
132
typedef struct {
133
AvahiSimplePoll *simple_poll;
162
134
AvahiServer *server;
163
135
gnutls_certificate_credentials_t cred;
164
136
unsigned int dh_bits;
165
137
gnutls_dh_params_t dh_params;
166
138
const char *priority;
167
139
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
140
} mandos_context;
172
141
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
142
/* global context so signal handler can reach it*/
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
175
146
176
147
sig_atomic_t quit_now = 0;
177
148
int signal_received = 0;
178
149
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
181
int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
184
errno = e;
185
perror(print_text);
186
}
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
198
150
/*
199
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
152
* bytes. "buffer_capacity" is how much is currently allocated,
201
153
* "buffer_length" is how much is already used.
202
154
*/
203
__attribute__((nonnull, warn_unused_result))
204
155
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
156
size_t buffer_capacity){
206
157
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
159
if(buffer == NULL){
213
160
return 0;
214
161
}
215
*buffer = new_buf;
216
162
buffer_capacity += BUFFER_SIZE;
217
163
}
218
164
return buffer_capacity;
219
165
}
220
166
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
229
return false;
230
}
231
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
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;
253
}
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
259
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
267
}
268
269
167
/*
270
168
* Initialize GPGME.
271
169
*/
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){
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
277
172
gpgme_error_t rc;
278
173
gpgme_engine_info_t engine_info;
279
174
175
280
176
/*
281
177
* Helper function to insert pub and seckey to the engine keyring.
282
178
*/
283
bool import_key(const char * const filename){
179
bool import_key(const char *filename){
284
180
int ret;
285
181
int fd;
286
182
gpgme_data_t pgp_data;
287
183
288
184
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
289
185
if(fd == -1){
290
perror_plus("open");
186
perror("open");
291
187
return false;
292
188
}
293
189
294
190
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
191
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
gpgme_strsource(rc), gpgme_strerror(rc));
298
194
return false;
299
195
}
300
196
301
rc = gpgme_op_import(mc->ctx, pgp_data);
197
rc = gpgme_op_import(mc.ctx, pgp_data);
302
198
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
305
201
return false;
306
202
}
307
203
308
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
309
205
if(ret == -1){
310
perror_plus("close");
206
perror("close");
311
207
}
312
208
gpgme_data_release(pgp_data);
313
209
return true;
314
210
}
315
211
316
212
if(debug){
317
fprintf_plus(stderr, "Initializing GPGME\n");
213
fprintf(stderr, "Initializing GPGME\n");
318
214
}
319
215
320
216
/* Init GPGME */
321
217
gpgme_check_version(NULL);
322
218
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
219
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
gpgme_strsource(rc), gpgme_strerror(rc));
326
222
return false;
327
223
}
328
224
329
/* Set GPGME home directory for the OpenPGP engine only */
225
/* Set GPGME home directory for the OpenPGP engine only */
330
226
rc = gpgme_get_engine_info(&engine_info);
331
227
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
gpgme_strsource(rc), gpgme_strerror(rc));
334
230
return false;
335
231
}
336
232
while(engine_info != NULL){
342
238
engine_info = engine_info->next;
343
239
}
344
240
if(engine_info == NULL){
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
347
242
return false;
348
243
}
349
244
350
245
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
246
rc = gpgme_new(&(mc.ctx));
352
247
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
356
250
return false;
357
251
}
358
252
367
261
* Decrypt OpenPGP data.
368
262
* Returns -1 on error
369
263
*/
370
__attribute__((nonnull, warn_unused_result))
371
264
static ssize_t pgp_packet_decrypt(const char *cryptotext,
372
265
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
266
char **plaintext){
375
267
gpgme_data_t dh_crypto, dh_plain;
376
268
gpgme_error_t rc;
377
269
ssize_t ret;
379
271
ssize_t plaintext_length = 0;
380
272
381
273
if(debug){
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
383
275
}
384
276
385
277
/* Create new GPGME data buffer from memory cryptotext */
386
278
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
387
279
0);
388
280
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
391
283
return -1;
392
284
}
393
285
394
286
/* Create new empty GPGME data buffer for the plaintext */
395
287
rc = gpgme_data_new(&dh_plain);
396
288
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
400
291
gpgme_data_release(dh_crypto);
401
292
return -1;
402
293
}
403
294
404
295
/* Decrypt data from the cryptotext data buffer to the plaintext
405
296
data buffer */
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
298
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
410
301
plaintext_length = -1;
411
302
if(debug){
412
303
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
304
result = gpgme_op_decrypt_result(mc.ctx);
414
305
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
416
307
} else {
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);
308
fprintf(stderr, "Unsupported algorithm: %s\n",
309
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
311
result->wrong_key_usage);
421
312
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
313
fprintf(stderr, "File name: %s\n", result->file_name);
423
314
}
424
315
gpgme_recipient_t recipient;
425
316
recipient = result->recipients;
426
317
while(recipient != NULL){
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");
318
fprintf(stderr, "Public key algorithm: %s\n",
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
321
fprintf(stderr, "Secret key available: %s\n",
322
recipient->status == GPG_ERR_NO_SECKEY
323
? "No" : "Yes");
434
324
recipient = recipient->next;
435
325
}
436
326
}
439
329
}
440
330
441
331
if(debug){
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
443
333
}
444
334
445
335
/* Seek back to the beginning of the GPGME plaintext data buffer */
446
336
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
447
perror_plus("gpgme_data_seek");
337
perror("gpgme_data_seek");
448
338
plaintext_length = -1;
449
339
goto decrypt_end;
450
340
}
452
342
*plaintext = NULL;
453
343
while(true){
454
344
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
456
plaintext_capacity);
345
(size_t)plaintext_length,
346
plaintext_capacity);
457
347
if(plaintext_capacity == 0){
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
348
perror("incbuffer");
349
plaintext_length = -1;
350
goto decrypt_end;
461
351
}
462
352
463
353
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
468
358
break;
469
359
}
470
360
if(ret < 0){
471
perror_plus("gpgme_data_read");
361
perror("gpgme_data_read");
472
362
plaintext_length = -1;
473
363
goto decrypt_end;
474
364
}
476
366
}
477
367
478
368
if(debug){
479
fprintf_plus(stderr, "Decrypted password is: ");
369
fprintf(stderr, "Decrypted password is: ");
480
370
for(ssize_t i = 0; i < plaintext_length; i++){
481
371
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
482
372
}
493
383
return plaintext_length;
494
384
}
495
385
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);
386
static const char * safer_gnutls_strerror(int value){
387
const char *ret = gnutls_strerror(value); /* Spurious warning from
388
-Wunreachable-code */
389
if(ret == NULL)
390
ret = "(unknown)";
391
return ret;
507
392
}
508
393
509
394
/* GnuTLS log function callback */
510
__attribute__((nonnull))
511
395
static void debuggnutls(__attribute__((unused)) int level,
512
396
const char* string){
513
fprintf_plus(stderr, "GnuTLS: %s", string);
397
fprintf(stderr, "GnuTLS: %s", string);
514
398
}
515
399
516
__attribute__((nonnull, warn_unused_result))
517
400
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
401
const char *seckeyfilename){
521
402
int ret;
522
unsigned int uret;
523
403
524
404
if(debug){
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
405
fprintf(stderr, "Initializing GnuTLS\n");
526
406
}
527
407
528
408
ret = gnutls_global_init();
529
409
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
531
safer_gnutls_strerror(ret));
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
532
412
return -1;
533
413
}
534
414
541
421
}
542
422
543
423
/* OpenPGP credentials */
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
424
gnutls_certificate_allocate_credentials(&mc.cred);
545
425
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
safer_gnutls_strerror(ret));
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
548
431
gnutls_global_deinit();
549
432
return -1;
550
433
}
551
434
552
435
if(debug){
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
555
pubkeyfilename,
556
seckeyfilename);
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
438
seckeyfilename);
557
439
}
558
440
559
441
ret = gnutls_certificate_set_openpgp_key_file
560
(mc->cred, pubkeyfilename, seckeyfilename,
442
(mc.cred, pubkeyfilename, seckeyfilename,
561
443
GNUTLS_OPENPGP_FMT_BASE64);
562
444
if(ret != GNUTLS_E_SUCCESS){
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));
445
fprintf(stderr,
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
safer_gnutls_strerror(ret));
568
450
goto globalfail;
569
451
}
570
452
571
453
/* GnuTLS server initialization */
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);
454
ret = gnutls_dh_params_init(&mc.dh_params);
455
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
458
goto globalfail;
459
}
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
461
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
464
goto globalfail;
465
}
466
467
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
752
468
753
469
return 0;
754
470
755
471
globalfail:
756
472
757
gnutls_certificate_free_credentials(mc->cred);
473
gnutls_certificate_free_credentials(mc.cred);
758
474
gnutls_global_deinit();
759
gnutls_dh_params_deinit(mc->dh_params);
475
gnutls_dh_params_deinit(mc.dh_params);
760
476
return -1;
761
477
}
762
478
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
765
mandos_context *mc){
479
static int init_gnutls_session(gnutls_session_t *session){
766
480
int ret;
767
481
/* GnuTLS session creation */
768
482
do {
772
486
}
773
487
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
774
488
if(ret != GNUTLS_E_SUCCESS){
775
fprintf_plus(stderr,
776
"Error in GnuTLS session initialization: %s\n",
777
safer_gnutls_strerror(ret));
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
safer_gnutls_strerror(ret));
778
491
}
779
492
780
493
{
781
494
const char *err;
782
495
do {
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
784
497
if(quit_now){
785
498
gnutls_deinit(*session);
786
499
return -1;
787
500
}
788
501
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
789
502
if(ret != GNUTLS_E_SUCCESS){
790
fprintf_plus(stderr, "Syntax error at: %s\n", err);
791
fprintf_plus(stderr, "GnuTLS error: %s\n",
792
safer_gnutls_strerror(ret));
503
fprintf(stderr, "Syntax error at: %s\n", err);
504
fprintf(stderr, "GnuTLS error: %s\n",
505
safer_gnutls_strerror(ret));
793
506
gnutls_deinit(*session);
794
507
return -1;
795
508
}
797
510
798
511
do {
799
512
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
800
mc->cred);
513
mc.cred);
801
514
if(quit_now){
802
515
gnutls_deinit(*session);
803
516
return -1;
804
517
}
805
518
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
806
519
if(ret != GNUTLS_E_SUCCESS){
807
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
808
safer_gnutls_strerror(ret));
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
521
safer_gnutls_strerror(ret));
809
522
gnutls_deinit(*session);
810
523
return -1;
811
524
}
813
526
/* ignore client certificate if any. */
814
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
815
528
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
530
816
531
return 0;
817
532
}
818
533
820
535
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
821
536
__attribute__((unused)) const char *txt){}
822
537
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
1040
538
/* Called when a Mandos server is found */
1041
__attribute__((nonnull, warn_unused_result))
1042
static int start_mandos_communication(const char *ip, in_port_t port,
539
static int start_mandos_communication(const char *ip, uint16_t port,
1043
540
AvahiIfIndex if_index,
1044
int af, mandos_context *mc){
541
int af){
1045
542
int ret, tcp_sd = -1;
1046
543
ssize_t sret;
1047
struct sockaddr_storage to;
544
union {
545
struct sockaddr_in in;
546
struct sockaddr_in6 in6;
547
} to;
1048
548
char *buffer = NULL;
1049
549
char *decrypted_buffer = NULL;
1050
550
size_t buffer_length = 0;
1053
553
int retval = -1;
1054
554
gnutls_session_t session;
1055
555
int pf; /* Protocol family */
1056
bool route_added = false;
1057
556
1058
557
errno = 0;
1059
558
1070
569
pf = PF_INET;
1071
570
break;
1072
571
default:
1073
fprintf_plus(stderr, "Bad address family: %d\n", af);
572
fprintf(stderr, "Bad address family: %d\n", af);
1074
573
errno = EINVAL;
1075
574
return -1;
1076
575
}
1077
576
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);
577
ret = init_gnutls_session(&session);
1111
578
if(ret != 0){
1112
579
return -1;
1113
580
}
1114
581
1115
582
if(debug){
1116
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1117
PRIuMAX "\n", ip, (uintmax_t)port);
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
584
"\n", ip, port);
1118
585
}
1119
586
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
588
if(tcp_sd < 0){
1122
589
int e = errno;
1123
perror_plus("socket");
590
perror("socket");
1124
591
errno = e;
1125
592
goto mandos_end;
1126
593
}
1132
599
1133
600
memset(&to, 0, sizeof(to));
1134
601
if(af == AF_INET6){
1135
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1136
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
602
to.in6.sin6_family = (sa_family_t)af;
603
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1137
604
} else { /* IPv4 */
1138
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1139
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
605
to.in.sin_family = (sa_family_t)af;
606
ret = inet_pton(af, ip, &to.in.sin_addr);
1140
607
}
1141
608
if(ret < 0 ){
1142
609
int e = errno;
1143
perror_plus("inet_pton");
610
perror("inet_pton");
1144
611
errno = e;
1145
612
goto mandos_end;
1146
613
}
1147
614
if(ret == 0){
1148
615
int e = errno;
1149
fprintf_plus(stderr, "Bad address: %s\n", ip);
616
fprintf(stderr, "Bad address: %s\n", ip);
1150
617
errno = e;
1151
618
goto mandos_end;
1152
619
}
1153
620
if(af == AF_INET6){
1154
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1155
if(IN6_IS_ADDR_LINKLOCAL
1156
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
621
to.in6.sin6_port = htons(port); /* Spurious warnings from
622
-Wconversion and
623
-Wunreachable-code */
624
625
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
626
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
627
-Wunreachable-code*/
1157
628
if(if_index == AVAHI_IF_UNSPEC){
1158
fprintf_plus(stderr, "An IPv6 link-local address is"
1159
" incomplete without a network interface\n");
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
630
" without a network interface\n");
1160
631
errno = EINVAL;
1161
632
goto mandos_end;
1162
633
}
1163
634
/* Set the network interface number as scope */
1164
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
635
to.in6.sin6_scope_id = (uint32_t)if_index;
1165
636
}
1166
637
} else {
1167
((struct sockaddr_in *)&to)->sin_port = htons(port);
638
to.in.sin_port = htons(port); /* Spurious warnings from
639
-Wconversion and
640
-Wunreachable-code */
1168
641
}
1169
642
1170
643
if(quit_now){
1176
649
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1177
650
char interface[IF_NAMESIZE];
1178
651
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1179
perror_plus("if_indextoname");
652
perror("if_indextoname");
1180
653
} else {
1181
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1182
"\n", ip, interface, (uintmax_t)port);
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
655
ip, interface, port);
1183
656
}
1184
657
} else {
1185
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1186
ip, (uintmax_t)port);
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
1187
660
}
1188
661
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1189
662
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
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;
663
const char *pcret;
664
if(af == AF_INET6){
665
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
666
sizeof(addrstr));
667
} else {
668
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
669
sizeof(addrstr));
670
}
671
if(pcret == NULL){
672
perror("inet_ntop");
673
} else {
674
if(strcmp(addrstr, ip) != 0){
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
676
}
677
}
678
}
679
680
if(quit_now){
681
errno = EINTR;
682
goto mandos_end;
683
}
684
685
if(af == AF_INET6){
686
ret = connect(tcp_sd, &to.in6, sizeof(to));
687
} else {
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
689
}
690
if(ret < 0){
691
int e = errno;
692
perror("connect");
693
errno = e;
694
goto mandos_end;
695
}
696
697
if(quit_now){
698
errno = EINTR;
699
goto mandos_end;
1270
700
}
1271
701
1272
702
const char *out = mandos_protocol_version;
1274
704
while(true){
1275
705
size_t out_size = strlen(out);
1276
706
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1277
out_size - written));
707
out_size - written));
1278
708
if(ret == -1){
1279
709
int e = errno;
1280
perror_plus("write");
710
perror("write");
1281
711
errno = e;
1282
712
goto mandos_end;
1283
713
}
1300
730
}
1301
731
1302
732
if(debug){
1303
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1304
734
}
1305
735
1306
736
if(quit_now){
1308
738
goto mandos_end;
1309
739
}
1310
740
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);
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1316
742
1317
743
if(quit_now){
1318
744
errno = EINTR;
1329
755
1330
756
if(ret != GNUTLS_E_SUCCESS){
1331
757
if(debug){
1332
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1333
759
gnutls_perror(ret);
1334
760
}
1335
761
errno = EPROTO;
1339
765
/* Read OpenPGP packet that contains the wanted password */
1340
766
1341
767
if(debug){
1342
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1343
" %s\n", ip);
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
769
ip);
1344
770
}
1345
771
1346
772
while(true){
1351
777
}
1352
778
1353
779
buffer_capacity = incbuffer(&buffer, buffer_length,
1354
buffer_capacity);
780
buffer_capacity);
1355
781
if(buffer_capacity == 0){
1356
782
int e = errno;
1357
perror_plus("incbuffer");
783
perror("incbuffer");
1358
784
errno = e;
1359
785
goto mandos_end;
1360
786
}
1384
810
}
1385
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1386
812
if(ret < 0){
1387
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1388
"***\n");
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1389
814
gnutls_perror(ret);
1390
815
errno = EPROTO;
1391
816
goto mandos_end;
1392
817
}
1393
818
break;
1394
819
default:
1395
fprintf_plus(stderr, "Unknown error while reading data from"
1396
" encrypted session with Mandos server\n");
820
fprintf(stderr, "Unknown error while reading data from"
821
" encrypted session with Mandos server\n");
1397
822
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1398
823
errno = EIO;
1399
824
goto mandos_end;
1404
829
}
1405
830
1406
831
if(debug){
1407
fprintf_plus(stderr, "Closing TLS session\n");
832
fprintf(stderr, "Closing TLS session\n");
1408
833
}
1409
834
1410
835
if(quit_now){
1422
847
1423
848
if(buffer_length > 0){
1424
849
ssize_t decrypted_buffer_size;
1425
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1426
&decrypted_buffer, mc);
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
851
buffer_length,
852
&decrypted_buffer);
1427
853
if(decrypted_buffer_size >= 0){
1428
854
1429
855
written = 0;
1439
865
if(ret == 0 and ferror(stdout)){
1440
866
int e = errno;
1441
867
if(debug){
1442
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1443
strerror(errno));
868
fprintf(stderr, "Error writing encrypted data: %s\n",
869
strerror(errno));
1444
870
}
1445
871
errno = e;
1446
872
goto mandos_end;
1455
881
1456
882
mandos_end:
1457
883
{
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
}
1464
884
int e = errno;
1465
885
free(decrypted_buffer);
1466
886
free(buffer);
1471
891
if(e == 0){
1472
892
e = errno;
1473
893
}
1474
perror_plus("close");
894
perror("close");
1475
895
}
1476
896
gnutls_deinit(session);
1477
errno = e;
1478
897
if(quit_now){
1479
errno = EINTR;
898
e = EINTR;
1480
899
retval = -1;
1481
900
}
901
errno = e;
1482
902
}
1483
903
return retval;
1484
904
}
1485
905
1486
__attribute__((nonnull))
1487
906
static void resolve_callback(AvahiSServiceResolver *r,
1488
907
AvahiIfIndex interface,
1489
908
AvahiProtocol proto,
1497
916
AVAHI_GCC_UNUSED AvahiStringList *txt,
1498
917
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1499
918
flags,
1500
void *mc){
1501
if(r == NULL){
1502
return;
1503
}
919
AVAHI_GCC_UNUSED void* userdata){
920
assert(r);
1504
921
1505
922
/* Called whenever a service has been resolved successfully or
1506
923
timed out */
1507
924
1508
925
if(quit_now){
1509
avahi_s_service_resolver_free(r);
1510
926
return;
1511
927
}
1512
928
1513
929
switch(event){
1514
930
default:
1515
931
case AVAHI_RESOLVER_FAILURE:
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)));
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
934
avahi_strerror(avahi_server_errno(mc.server)));
1521
935
break;
1522
936
1523
937
case AVAHI_RESOLVER_FOUND:
1525
939
char ip[AVAHI_ADDRESS_STR_MAX];
1526
940
avahi_address_snprint(ip, sizeof(ip), address);
1527
941
if(debug){
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);
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
944
ip, (intmax_t)interface, port);
1531
945
}
1532
int ret = start_mandos_communication(ip, (in_port_t)port,
1533
interface,
1534
avahi_proto_to_af(proto),
1535
mc);
946
int ret = start_mandos_communication(ip, port, interface,
947
avahi_proto_to_af(proto));
1536
948
if(ret == 0){
1537
avahi_simple_poll_quit(simple_poll);
1538
} else {
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
}
949
avahi_simple_poll_quit(mc.simple_poll);
1545
950
}
1546
951
}
1547
952
}
1557
962
const char *domain,
1558
963
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1559
964
flags,
1560
void *mc){
1561
if(b == NULL){
1562
return;
1563
}
965
AVAHI_GCC_UNUSED void* userdata){
966
assert(b);
1564
967
1565
968
/* Called whenever a new services becomes available on the LAN or
1566
969
is removed from the LAN */
1573
976
default:
1574
977
case AVAHI_BROWSER_FAILURE:
1575
978
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);
979
fprintf(stderr, "(Avahi browser) %s\n",
980
avahi_strerror(avahi_server_errno(mc.server)));
981
avahi_simple_poll_quit(mc.simple_poll);
1580
982
return;
1581
983
1582
984
case AVAHI_BROWSER_NEW:
1585
987
the callback function is called the Avahi server will free the
1586
988
resolver for us. */
1587
989
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)));
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
name, type, domain, protocol, 0,
992
resolve_callback, NULL) == NULL)
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
994
name, avahi_strerror(avahi_server_errno(mc.server)));
1596
995
break;
1597
996
1598
997
case AVAHI_BROWSER_REMOVE:
1601
1000
case AVAHI_BROWSER_ALL_FOR_NOW:
1602
1001
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1603
1002
if(debug){
1604
fprintf_plus(stderr, "No Mandos server found, still"
1605
" searching...\n");
1003
fprintf(stderr, "No Mandos server found, still searching...\n");
1606
1004
}
1607
1005
break;
1608
1006
}
1609
1007
}
1610
1008
1611
/* Signal handler that stops main loop after SIGTERM */
1009
/* stop main loop after sigterm has been called */
1612
1010
static void handle_sigterm(int sig){
1613
1011
if(quit_now){
1614
1012
return;
1616
1014
quit_now = 1;
1617
1015
signal_received = sig;
1618
1016
int old_errno = errno;
1619
/* set main loop to exit */
1620
if(simple_poll != NULL){
1621
avahi_simple_poll_quit(simple_poll);
1622
}
1623
errno = old_errno;
1624
}
1625
1626
__attribute__((nonnull, warn_unused_result))
1627
bool get_flags(const char *ifname, struct ifreq *ifr){
1628
int ret;
1629
error_t ret_errno;
1630
1631
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1632
if(s < 0){
1633
ret_errno = errno;
1634
perror_plus("socket");
1635
errno = ret_errno;
1636
return false;
1637
}
1638
strcpy(ifr->ifr_name, ifname);
1639
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1640
if(ret == -1){
1641
if(debug){
1642
ret_errno = errno;
1643
perror_plus("ioctl SIOCGIFFLAGS");
1644
errno = ret_errno;
1645
}
1646
return false;
1647
}
1648
return true;
1649
}
1650
1651
__attribute__((nonnull, warn_unused_result))
1652
bool good_flags(const char *ifname, const struct ifreq *ifr){
1653
1654
/* Reject the loopback device */
1655
if(ifr->ifr_flags & IFF_LOOPBACK){
1656
if(debug){
1657
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1658
ifname);
1659
}
1660
return false;
1661
}
1662
/* Accept point-to-point devices only if connect_to is specified */
1663
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1664
if(debug){
1665
fprintf_plus(stderr, "Accepting point-to-point interface"
1666
" \"%s\"\n", ifname);
1667
}
1668
return true;
1669
}
1670
/* Otherwise, reject non-broadcast-capable devices */
1671
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1672
if(debug){
1673
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1674
" \"%s\"\n", ifname);
1675
}
1676
return false;
1677
}
1678
/* Reject non-ARP interfaces (including dummy interfaces) */
1679
if(ifr->ifr_flags & IFF_NOARP){
1680
if(debug){
1681
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1682
ifname);
1683
}
1684
return false;
1685
}
1686
1687
/* Accept this device */
1688
if(debug){
1689
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1690
}
1691
return true;
1692
}
1693
1694
/*
1695
* This function determines if a directory entry in /sys/class/net
1696
* corresponds to an acceptable network device.
1697
* (This function is passed to scandir(3) as a filter function.)
1698
*/
1699
__attribute__((nonnull, warn_unused_result))
1700
int good_interface(const struct dirent *if_entry){
1701
if(if_entry->d_name[0] == '.'){
1702
return 0;
1703
}
1704
1705
struct ifreq ifr;
1706
if(not get_flags(if_entry->d_name, &ifr)){
1707
if(debug){
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))
1755
int notdotentries(const struct dirent *direntry){
1756
/* Skip "." and ".." */
1757
if(direntry->d_name[0] == '.'
1758
and (direntry->d_name[1] == '\0'
1759
or (direntry->d_name[1] == '.'
1760
and direntry->d_name[2] == '\0'))){
1761
return 0;
1762
}
1763
return 1;
1764
}
1765
1766
/* Is this directory entry a runnable program? */
1767
__attribute__((nonnull, warn_unused_result))
1768
int runnable_hook(const struct dirent *direntry){
1769
int ret;
1770
size_t sret;
1771
struct stat st;
1772
1773
if((direntry->d_name)[0] == '\0'){
1774
/* Empty name? */
1775
return 0;
1776
}
1777
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);
1792
if(ret == -1){
1793
if(debug){
1794
perror_plus("Could not stat hook");
1795
}
1796
return 0;
1797
}
1798
if(not (S_ISREG(st.st_mode))){
1799
/* Not a regular file */
1800
if(debug){
1801
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1802
direntry->d_name);
1803
}
1804
return 0;
1805
}
1806
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1807
/* Not executable */
1808
if(debug){
1809
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1810
direntry->d_name);
1811
}
1812
return 0;
1813
}
1814
if(debug){
1815
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1816
direntry->d_name);
1817
}
1818
return 1;
1819
}
1820
1821
__attribute__((nonnull, warn_unused_result))
1822
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1823
mandos_context *mc){
1824
int ret;
1825
struct timespec now;
1826
struct timespec waited_time;
1827
intmax_t block_time;
1828
1829
while(true){
1830
if(mc->current_server == NULL){
1831
if(debug){
1832
fprintf_plus(stderr, "Wait until first server is found."
1833
" No timeout!\n");
1834
}
1835
ret = avahi_simple_poll_iterate(s, -1);
1836
} else {
1837
if(debug){
1838
fprintf_plus(stderr, "Check current_server if we should run"
1839
" it, or wait\n");
1840
}
1841
/* the current time */
1842
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1843
if(ret == -1){
1844
perror_plus("clock_gettime");
1845
return -1;
1846
}
1847
/* Calculating in ms how long time between now and server
1848
who we visted longest time ago. Now - last seen. */
1849
waited_time.tv_sec = (now.tv_sec
1850
- mc->current_server->last_seen.tv_sec);
1851
waited_time.tv_nsec = (now.tv_nsec
1852
- mc->current_server->last_seen.tv_nsec);
1853
/* total time is 10s/10,000ms.
1854
Converting to s from ms by dividing by 1,000,
1855
and ns to ms by dividing by 1,000,000. */
1856
block_time = ((retry_interval
1857
- ((intmax_t)waited_time.tv_sec * 1000))
1858
- ((intmax_t)waited_time.tv_nsec / 1000000));
1859
1860
if(debug){
1861
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1862
block_time);
1863
}
1864
1865
if(block_time <= 0){
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);
1870
if(ret == 0){
1871
avahi_simple_poll_quit(s);
1872
return 0;
1873
}
1874
ret = clock_gettime(CLOCK_MONOTONIC,
1875
&mc->current_server->last_seen);
1876
if(ret == -1){
1877
perror_plus("clock_gettime");
1878
return -1;
1879
}
1880
mc->current_server = mc->current_server->next;
1881
block_time = 0; /* Call avahi to find new Mandos
1882
servers, but don't block */
1883
}
1884
1885
ret = avahi_simple_poll_iterate(s, (int)block_time);
1886
}
1887
if(ret != 0){
1888
if(ret > 0 or errno != EINTR){
1889
return (ret != 1) ? ret : 0;
1890
}
1891
}
1892
}
1893
}
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;
1017
if(mc.simple_poll != NULL){
1018
avahi_simple_poll_quit(mc.simple_poll);
1019
}
1020
errno = old_errno;
2285
1021
}
2286
1022
2287
1023
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 };
2292
1024
AvahiSServiceBrowser *sb = NULL;
2293
error_t ret_errno;
1025
int error;
2294
1026
int ret;
2295
1027
intmax_t tmpmax;
2296
1028
char *tmp;
2297
1029
int exitcode = EXIT_SUCCESS;
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;
1030
const char *interface = "eth0";
1031
struct ifreq network;
1032
int sd = -1;
1033
bool take_down_interface = false;
1034
uid_t uid;
1035
gid_t gid;
1036
char *connect_to = NULL;
1037
char tempdir[] = "/tmp/mandosXXXXXX";
1038
bool tempdir_created = false;
2303
1039
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2304
1040
const char *seckey = PATHDIR "/" SECKEY;
2305
1041
const char *pubkey = PATHDIR "/" PUBKEY;
2306
const char *dh_params_file = NULL;
2307
char *interfaces_hooks = NULL;
2308
1042
2309
1043
bool gnutls_initialized = false;
2310
1044
bool gpgme_initialized = false;
2311
1045
float delay = 2.5f;
2312
double retry_interval = 10; /* 10s between trying a server and
2313
retrying the same server again */
2314
1046
2315
1047
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2316
1048
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2322
1054
errno = 0;
2323
1055
ret = setgid(gid);
2324
1056
if(ret == -1){
2325
perror_plus("setgid");
1057
perror("setgid");
2326
1058
}
2327
1059
2328
1060
/* Lower user privileges (temporarily) */
2329
1061
errno = 0;
2330
1062
ret = seteuid(uid);
2331
1063
if(ret == -1){
2332
perror_plus("seteuid");
1064
perror("seteuid");
2333
1065
}
2334
1066
2335
1067
if(quit_now){
2362
1094
.doc = "Bit length of the prime number used in the"
2363
1095
" Diffie-Hellman key exchange",
2364
1096
.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 },
2370
1097
{ .name = "priority", .key = 130,
2371
1098
.arg = "STRING",
2372
1099
.doc = "GnuTLS priority string for the TLS handshake",
2375
1102
.arg = "SECONDS",
2376
1103
.doc = "Maximum delay to wait for interface startup",
2377
1104
.group = 2 },
2378
{ .name = "retry", .key = 132,
2379
.arg = "SECONDS",
2380
.doc = "Retry interval used when denied by the Mandos server",
2381
.group = 2 },
2382
{ .name = "network-hook-dir", .key = 133,
2383
.arg = "DIR",
2384
.doc = "Directory where network hooks are located",
2385
.group = 2 },
2386
1105
/*
2387
1106
* These reproduce what we would get without ARGP_NO_HELP
2388
1107
*/
2406
1125
connect_to = arg;
2407
1126
break;
2408
1127
case 'i': /* --interface */
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
}
1128
interface = arg;
2414
1129
break;
2415
1130
case 's': /* --seckey */
2416
1131
seckey = arg;
2427
1142
}
2428
1143
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2429
1144
break;
2430
case 134: /* --dh-params */
2431
dh_params_file = arg;
2432
break;
2433
1145
case 130: /* --priority */
2434
1146
mc.priority = arg;
2435
1147
break;
2439
1151
if(errno != 0 or tmp == arg or *tmp != '\0'){
2440
1152
argp_error(state, "Bad delay");
2441
1153
}
2442
case 132: /* --retry */
2443
errno = 0;
2444
retry_interval = strtod(arg, &tmp);
2445
if(errno != 0 or tmp == arg or *tmp != '\0'
2446
or (retry_interval * 1000) > INT_MAX
2447
or retry_interval < 0){
2448
argp_error(state, "Bad retry interval");
2449
}
2450
break;
2451
case 133: /* --network-hook-dir */
2452
hookdir = arg;
2453
1154
break;
2454
1155
/*
2455
1156
* These reproduce what we would get without ARGP_NO_HELP
2462
1163
argp_state_help(state, state->out_stream,
2463
1164
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2464
1165
case 'V': /* --version */
2465
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
2466
1167
exit(argp_err_exit_status);
2467
1168
break;
2468
1169
default:
2483
1184
case ENOMEM:
2484
1185
default:
2485
1186
errno = ret;
2486
perror_plus("argp_parse");
1187
perror("argp_parse");
2487
1188
exitcode = EX_OSERR;
2488
1189
goto end;
2489
1190
case EINVAL:
2492
1193
}
2493
1194
}
2494
1195
2495
{
2496
/* Work around Debian bug #633582:
2497
<http://bugs.debian.org/633582> */
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");
2504
} else {
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
/* Lower privileges */
2550
ret_errno = lower_privileges();
2551
if(ret_errno != 0){
2552
errno = ret_errno;
2553
perror_plus("Failed to lower privileges");
2554
}
2555
}
2556
}
2557
2558
/* Remove invalid interface names (except "none") */
2559
{
2560
char *interface = NULL;
2561
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2562
interface))){
2563
if(strcmp(interface, "none") != 0
2564
and if_nametoindex(interface) == 0){
2565
if(interface[0] != '\0'){
2566
fprintf_plus(stderr, "Not using nonexisting interface"
2567
" \"%s\"\n", interface);
2568
}
2569
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2570
interface = NULL;
2571
}
2572
}
2573
}
2574
2575
/* Run network hooks */
2576
{
2577
if(mc.interfaces != NULL){
2578
interfaces_hooks = malloc(mc.interfaces_size);
2579
if(interfaces_hooks == NULL){
2580
perror_plus("malloc");
2581
goto end;
2582
}
2583
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2584
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2585
}
2586
run_network_hooks("start", interfaces_hooks != NULL ?
2587
interfaces_hooks : "", delay);
2588
}
2589
2590
1196
if(not debug){
2591
1197
avahi_set_log_function(empty_log);
2592
1198
}
2595
1201
from the signal handler */
2596
1202
/* Initialize the pseudo-RNG for Avahi */
2597
1203
srand((unsigned int) time(NULL));
2598
simple_poll = avahi_simple_poll_new();
2599
if(simple_poll == NULL){
2600
fprintf_plus(stderr,
2601
"Avahi: Failed to create simple poll object.\n");
1204
mc.simple_poll = avahi_simple_poll_new();
1205
if(mc.simple_poll == NULL){
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2602
1207
exitcode = EX_UNAVAILABLE;
2603
1208
goto end;
2604
1209
}
2606
1211
sigemptyset(&sigterm_action.sa_mask);
2607
1212
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2608
1213
if(ret == -1){
2609
perror_plus("sigaddset");
1214
perror("sigaddset");
2610
1215
exitcode = EX_OSERR;
2611
1216
goto end;
2612
1217
}
2613
1218
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2614
1219
if(ret == -1){
2615
perror_plus("sigaddset");
1220
perror("sigaddset");
2616
1221
exitcode = EX_OSERR;
2617
1222
goto end;
2618
1223
}
2619
1224
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2620
1225
if(ret == -1){
2621
perror_plus("sigaddset");
1226
perror("sigaddset");
2622
1227
exitcode = EX_OSERR;
2623
1228
goto end;
2624
1229
}
2628
1233
*/
2629
1234
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2630
1235
if(ret == -1){
2631
perror_plus("sigaction");
1236
perror("sigaction");
2632
1237
return EX_OSERR;
2633
1238
}
2634
1239
if(old_sigterm_action.sa_handler != SIG_IGN){
2635
1240
ret = sigaction(SIGINT, &sigterm_action, NULL);
2636
1241
if(ret == -1){
2637
perror_plus("sigaction");
1242
perror("sigaction");
2638
1243
exitcode = EX_OSERR;
2639
1244
goto end;
2640
1245
}
2641
1246
}
2642
1247
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2643
1248
if(ret == -1){
2644
perror_plus("sigaction");
1249
perror("sigaction");
2645
1250
return EX_OSERR;
2646
1251
}
2647
1252
if(old_sigterm_action.sa_handler != SIG_IGN){
2648
1253
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2649
1254
if(ret == -1){
2650
perror_plus("sigaction");
1255
perror("sigaction");
2651
1256
exitcode = EX_OSERR;
2652
1257
goto end;
2653
1258
}
2654
1259
}
2655
1260
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2656
1261
if(ret == -1){
2657
perror_plus("sigaction");
1262
perror("sigaction");
2658
1263
return EX_OSERR;
2659
1264
}
2660
1265
if(old_sigterm_action.sa_handler != SIG_IGN){
2661
1266
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2662
1267
if(ret == -1){
2663
perror_plus("sigaction");
1268
perror("sigaction");
2664
1269
exitcode = EX_OSERR;
2665
1270
goto end;
2666
1271
}
2667
1272
}
2668
1273
2669
/* If no interfaces were specified, make a list */
2670
if(mc.interfaces == NULL){
2671
struct dirent **direntries = NULL;
2672
/* Look for any good interfaces */
2673
ret = scandir(sys_class_net, &direntries, good_interface,
2674
alphasort);
2675
if(ret >= 1){
2676
/* Add all found interfaces to interfaces list */
2677
for(int i = 0; i < ret; ++i){
2678
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2679
direntries[i]->d_name);
2680
if(ret_errno != 0){
2681
errno = ret_errno;
2682
perror_plus("argz_add");
2683
free(direntries[i]);
2684
continue;
2685
}
2686
if(debug){
2687
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2688
direntries[i]->d_name);
2689
}
2690
free(direntries[i]);
2691
}
2692
free(direntries);
1274
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
if(if_index == 0){
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1279
exitcode = EX_UNAVAILABLE;
1280
goto end;
1281
}
1282
1283
if(quit_now){
1284
goto end;
1285
}
1286
1287
/* Re-raise priviliges */
1288
errno = 0;
1289
ret = seteuid(0);
1290
if(ret == -1){
1291
perror("seteuid");
1292
}
1293
1294
#ifdef __linux__
1295
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1296
messages about the network interface to mess up the prompt */
1297
ret = klogctl(8, NULL, 5);
1298
bool restore_loglevel = true;
1299
if(ret == -1){
1300
restore_loglevel = false;
1301
perror("klogctl");
1302
}
1303
#endif /* __linux__ */
1304
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1306
if(sd < 0){
1307
perror("socket");
1308
exitcode = EX_OSERR;
1309
#ifdef __linux__
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1312
if(ret == -1){
1313
perror("klogctl");
1314
}
1315
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1323
goto end;
1324
}
1325
strcpy(network.ifr_name, interface);
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1327
if(ret == -1){
1328
perror("ioctl SIOCGIFFLAGS");
1329
#ifdef __linux__
1330
if(restore_loglevel){
1331
ret = klogctl(7, NULL, 0);
1332
if(ret == -1){
1333
perror("klogctl");
1334
}
1335
}
1336
#endif /* __linux__ */
1337
exitcode = EX_OSERR;
1338
/* Lower privileges */
1339
errno = 0;
1340
ret = seteuid(uid);
1341
if(ret == -1){
1342
perror("seteuid");
1343
}
1344
goto end;
1345
}
1346
if((network.ifr_flags & IFF_UP) == 0){
1347
network.ifr_flags |= IFF_UP;
1348
take_down_interface = true;
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
if(ret == -1){
1351
take_down_interface = false;
1352
perror("ioctl SIOCSIFFLAGS");
1353
exitcode = EX_OSERR;
1354
#ifdef __linux__
1355
if(restore_loglevel){
1356
ret = klogctl(7, NULL, 0);
1357
if(ret == -1){
1358
perror("klogctl");
1359
}
1360
}
1361
#endif /* __linux__ */
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1368
goto end;
1369
}
1370
}
1371
/* sleep checking until interface is running */
1372
for(int i=0; i < delay * 4; i++){
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1374
if(ret == -1){
1375
perror("ioctl SIOCGIFFLAGS");
1376
} else if(network.ifr_flags & IFF_RUNNING){
1377
break;
1378
}
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1380
ret = nanosleep(&sleeptime, NULL);
1381
if(ret == -1 and errno != EINTR){
1382
perror("nanosleep");
1383
}
1384
}
1385
if(not take_down_interface){
1386
/* We won't need the socket anymore */
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1388
if(ret == -1){
1389
perror("close");
1390
}
1391
}
1392
#ifdef __linux__
1393
if(restore_loglevel){
1394
/* Restores kernel loglevel to default */
1395
ret = klogctl(7, NULL, 0);
1396
if(ret == -1){
1397
perror("klogctl");
1398
}
1399
}
1400
#endif /* __linux__ */
1401
/* Lower privileges */
1402
errno = 0;
1403
if(take_down_interface){
1404
/* Lower privileges */
1405
ret = seteuid(uid);
1406
if(ret == -1){
1407
perror("seteuid");
1408
}
2693
1409
} else {
2694
if(ret == 0){
2695
free(direntries);
2696
}
2697
fprintf_plus(stderr, "Could not find a network interface\n");
2698
exitcode = EXIT_FAILURE;
2699
goto end;
2700
}
2701
}
2702
2703
/* Bring up interfaces which are down, and remove any "none"s */
2704
{
2705
char *interface = NULL;
2706
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2707
interface))){
2708
/* If interface name is "none", stop bringing up interfaces.
2709
Also remove all instances of "none" from the list */
2710
if(strcmp(interface, "none") == 0){
2711
argz_delete(&mc.interfaces, &mc.interfaces_size,
2712
interface);
2713
interface = NULL;
2714
while((interface = argz_next(mc.interfaces,
2715
mc.interfaces_size, interface))){
2716
if(strcmp(interface, "none") == 0){
2717
argz_delete(&mc.interfaces, &mc.interfaces_size,
2718
interface);
2719
interface = NULL;
2720
}
2721
}
2722
break;
2723
}
2724
bool interface_was_up = interface_is_up(interface);
2725
errno = bring_up_interface(interface, delay);
2726
if(not interface_was_up){
2727
if(errno != 0){
2728
perror_plus("Failed to bring up interface");
2729
} else {
2730
errno = argz_add(&interfaces_to_take_down,
2731
&interfaces_to_take_down_size,
2732
interface);
2733
if(errno != 0){
2734
perror_plus("argz_add");
2735
}
2736
}
2737
}
2738
}
2739
if(debug and (interfaces_to_take_down == NULL)){
2740
fprintf_plus(stderr, "No interfaces were brought up\n");
2741
}
2742
}
2743
2744
/* If we only got one interface, explicitly use only that one */
2745
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2746
if(debug){
2747
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2748
mc.interfaces);
2749
}
2750
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1410
/* Lower privileges permanently */
1411
ret = setuid(uid);
1412
if(ret == -1){
1413
perror("setuid");
1414
}
1415
}
2751
1416
}
2752
1417
2753
1418
if(quit_now){
2754
1419
goto end;
2755
1420
}
2756
1421
2757
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1422
ret = init_gnutls_global(pubkey, seckey);
2758
1423
if(ret == -1){
2759
fprintf_plus(stderr, "init_gnutls_global failed\n");
1424
fprintf(stderr, "init_gnutls_global failed\n");
2760
1425
exitcode = EX_UNAVAILABLE;
2761
1426
goto end;
2762
1427
} else {
2767
1432
goto end;
2768
1433
}
2769
1434
2770
/* Try /run/tmp before /tmp */
2771
tempdir = mkdtemp(run_tempdir);
2772
if(tempdir == NULL and errno == ENOENT){
2773
if(debug){
2774
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2775
run_tempdir, old_tempdir);
2776
}
2777
tempdir = mkdtemp(old_tempdir);
2778
}
2779
if(tempdir == NULL){
2780
perror_plus("mkdtemp");
1435
tempdir_created = true;
1436
if(mkdtemp(tempdir) == NULL){
1437
tempdir_created = false;
1438
perror("mkdtemp");
2781
1439
goto end;
2782
1440
}
2783
1441
2785
1443
goto end;
2786
1444
}
2787
1445
2788
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2789
fprintf_plus(stderr, "init_gpgme failed\n");
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
1447
fprintf(stderr, "init_gpgme failed\n");
2790
1448
exitcode = EX_UNAVAILABLE;
2791
1449
goto end;
2792
1450
} else {
2801
1459
/* Connect directly, do not use Zeroconf */
2802
1460
/* (Mainly meant for debugging) */
2803
1461
char *address = strrchr(connect_to, ':');
2804
2805
1462
if(address == NULL){
2806
fprintf_plus(stderr, "No colon in address\n");
1463
fprintf(stderr, "No colon in address\n");
2807
1464
exitcode = EX_USAGE;
2808
1465
goto end;
2809
1466
}
2812
1469
goto end;
2813
1470
}
2814
1471
2815
in_port_t port;
1472
uint16_t port;
2816
1473
errno = 0;
2817
1474
tmpmax = strtoimax(address+1, &tmp, 10);
2818
1475
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2819
or tmpmax != (in_port_t)tmpmax){
2820
fprintf_plus(stderr, "Bad port number\n");
1476
or tmpmax != (uint16_t)tmpmax){
1477
fprintf(stderr, "Bad port number\n");
2821
1478
exitcode = EX_USAGE;
2822
1479
goto end;
2823
1480
}
2824
1481
2825
1482
if(quit_now){
2826
1483
goto end;
2827
1484
}
2828
1485
2829
port = (in_port_t)tmpmax;
1486
port = (uint16_t)tmpmax;
2830
1487
*address = '\0';
1488
address = connect_to;
2831
1489
/* Colon in address indicates IPv6 */
2832
1490
int af;
2833
if(strchr(connect_to, ':') != NULL){
1491
if(strchr(address, ':') != NULL){
2834
1492
af = AF_INET6;
2835
/* Accept [] around IPv6 address - see RFC 5952 */
2836
if(connect_to[0] == '[' and address[-1] == ']')
2837
{
2838
connect_to++;
2839
address[-1] = '\0';
2840
}
2841
1493
} else {
2842
1494
af = AF_INET;
2843
1495
}
2844
address = connect_to;
2845
1496
2846
1497
if(quit_now){
2847
1498
goto end;
2848
1499
}
2849
1500
2850
while(not quit_now){
2851
ret = start_mandos_communication(address, port, if_index, af,
2852
&mc);
2853
if(quit_now or ret == 0){
2854
break;
2855
}
2856
if(debug){
2857
fprintf_plus(stderr, "Retrying in %d seconds\n",
2858
(int)retry_interval);
2859
}
2860
sleep((unsigned int)retry_interval);
2861
}
2862
2863
if(not quit_now){
1501
ret = start_mandos_communication(address, port, if_index, af);
1502
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1522
} else {
2864
1523
exitcode = EXIT_SUCCESS;
2865
1524
}
2866
2867
1525
goto end;
2868
1526
}
2869
1527
2881
1539
config.publish_domain = 0;
2882
1540
2883
1541
/* Allocate a new server */
2884
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2885
&config, NULL, NULL, &ret_errno);
1542
mc.server = avahi_server_new(avahi_simple_poll_get
1543
(mc.simple_poll), &config, NULL,
1544
NULL, &error);
2886
1545
2887
1546
/* Free the Avahi configuration data */
2888
1547
avahi_server_config_free(&config);
2890
1549
2891
1550
/* Check if creating the Avahi server object succeeded */
2892
1551
if(mc.server == NULL){
2893
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2894
avahi_strerror(ret_errno));
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
1553
avahi_strerror(error));
2895
1554
exitcode = EX_UNAVAILABLE;
2896
1555
goto end;
2897
1556
}
2903
1562
/* Create the Avahi service browser */
2904
1563
sb = avahi_s_service_browser_new(mc.server, if_index,
2905
1564
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2906
NULL, 0, browse_callback,
2907
(void *)&mc);
1565
NULL, 0, browse_callback, NULL);
2908
1566
if(sb == NULL){
2909
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2910
avahi_strerror(avahi_server_errno(mc.server)));
1567
fprintf(stderr, "Failed to create service browser: %s\n",
1568
avahi_strerror(avahi_server_errno(mc.server)));
2911
1569
exitcode = EX_UNAVAILABLE;
2912
1570
goto end;
2913
1571
}
2919
1577
/* Run the main loop */
2920
1578
2921
1579
if(debug){
2922
fprintf_plus(stderr, "Starting Avahi loop search\n");
1580
fprintf(stderr, "Starting Avahi loop search\n");
2923
1581
}
2924
1582
2925
ret = avahi_loop_with_timeout(simple_poll,
2926
(int)(retry_interval * 1000), &mc);
2927
if(debug){
2928
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2929
(ret == 0) ? "successfully" : "with error");
2930
}
1583
avahi_simple_poll_loop(mc.simple_poll);
2931
1584
2932
1585
end:
2933
1586
2934
1587
if(debug){
2935
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1588
fprintf(stderr, "%s exiting\n", argv[0]);
2936
1589
}
2937
1590
2938
1591
/* Cleanup things */
2939
free(mc.interfaces);
2940
2941
1592
if(sb != NULL)
2942
1593
avahi_s_service_browser_free(sb);
2943
1594
2944
1595
if(mc.server != NULL)
2945
1596
avahi_server_free(mc.server);
2946
1597
2947
if(simple_poll != NULL)
2948
avahi_simple_poll_free(simple_poll);
1598
if(mc.simple_poll != NULL)
1599
avahi_simple_poll_free(mc.simple_poll);
2949
1600
2950
1601
if(gnutls_initialized){
2951
1602
gnutls_certificate_free_credentials(mc.cred);
2957
1608
gpgme_release(mc.ctx);
2958
1609
}
2959
1610
2960
/* Cleans up the circular linked list of Mandos servers the client
2961
has seen */
2962
if(mc.current_server != NULL){
2963
mc.current_server->prev->next = NULL;
2964
while(mc.current_server != NULL){
2965
server *next = mc.current_server->next;
2966
#ifdef __GNUC__
2967
#pragma GCC diagnostic push
2968
#pragma GCC diagnostic ignored "-Wcast-qual"
2969
#endif
2970
free((char *)(mc.current_server->ip));
2971
#ifdef __GNUC__
2972
#pragma GCC diagnostic pop
2973
#endif
2974
free(mc.current_server);
2975
mc.current_server = next;
2976
}
2977
}
2978
2979
/* Re-raise privileges */
2980
{
2981
ret_errno = raise_privileges();
2982
if(ret_errno != 0){
2983
errno = ret_errno;
2984
perror_plus("Failed to raise privileges");
2985
} else {
2986
2987
/* Run network hooks */
2988
run_network_hooks("stop", interfaces_hooks != NULL ?
2989
interfaces_hooks : "", delay);
2990
2991
/* Take down the network interfaces which were brought up */
2992
{
2993
char *interface = NULL;
2994
while((interface=argz_next(interfaces_to_take_down,
2995
interfaces_to_take_down_size,
2996
interface))){
2997
ret_errno = take_down_interface(interface);
2998
if(ret_errno != 0){
2999
errno = ret_errno;
3000
perror_plus("Failed to take down interface");
3001
}
3002
}
3003
if(debug and (interfaces_to_take_down == NULL)){
3004
fprintf_plus(stderr, "No interfaces needed to be taken"
3005
" down\n");
3006
}
3007
}
3008
}
3009
3010
ret_errno = lower_privileges_permanently();
3011
if(ret_errno != 0){
3012
errno = ret_errno;
3013
perror_plus("Failed to lower privileges permanently");
3014
}
3015
}
3016
3017
free(interfaces_to_take_down);
3018
free(interfaces_hooks);
3019
3020
/* Removes the GPGME temp directory and all files inside */
3021
if(tempdir != NULL){
3022
struct dirent **direntries = NULL;
3023
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3024
| O_NOFOLLOW
3025
| O_DIRECTORY
3026
| O_PATH));
3027
if(tempdir_fd == -1){
3028
perror_plus("open");
3029
} else {
3030
#ifdef __GLIBC__
3031
#if __GLIBC_PREREQ(2, 15)
3032
int numentries = scandirat(tempdir_fd, ".", &direntries,
3033
notdotentries, alphasort);
3034
#else /* not __GLIBC_PREREQ(2, 15) */
3035
int numentries = scandir(tempdir, &direntries, notdotentries,
3036
alphasort);
3037
#endif /* not __GLIBC_PREREQ(2, 15) */
3038
#else /* not __GLIBC__ */
3039
int numentries = scandir(tempdir, &direntries, notdotentries,
3040
alphasort);
3041
#endif /* not __GLIBC__ */
3042
if(numentries >= 0){
3043
for(int i = 0; i < numentries; i++){
3044
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3045
if(ret == -1){
3046
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3047
" \"%s\", 0): %s\n", tempdir,
3048
direntries[i]->d_name, strerror(errno));
3049
}
3050
free(direntries[i]);
3051
}
3052
3053
/* need to clean even if 0 because man page doesn't specify */
3054
free(direntries);
3055
if(numentries == -1){
3056
perror_plus("scandir");
3057
}
3058
ret = rmdir(tempdir);
3059
if(ret == -1 and errno != ENOENT){
3060
perror_plus("rmdir");
3061
}
3062
}
3063
TEMP_FAILURE_RETRY(close(tempdir_fd));
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
1614
errno = 0;
1615
ret = seteuid(0);
1616
if(ret == -1){
1617
perror("seteuid");
1618
}
1619
if(geteuid() == 0){
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
1628
}
1629
}
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
if(ret == -1){
1632
perror("close");
1633
}
1634
/* Lower privileges permanently */
1635
errno = 0;
1636
ret = setuid(uid);
1637
if(ret == -1){
1638
perror("setuid");
1639
}
1640
}
1641
}
1642
1643
/* Removes the temp directory used by GPGME */
1644
if(tempdir_created){
1645
DIR *d;
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1648
if(d == NULL){
1649
if(errno != ENOENT){
1650
perror("opendir");
1651
}
1652
} else {
1653
while(true){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1656
break;
1657
}
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
1663
continue;
1664
}
1665
char *fullname = NULL;
1666
ret = asprintf(&fullname, "%s/%s", tempdir,
1667
direntry->d_name);
1668
if(ret < 0){
1669
perror("asprintf");
1670
continue;
1671
}
1672
ret = remove(fullname);
1673
if(ret == -1){
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
1676
}
1677
free(fullname);
1678
}
1679
closedir(d);
1680
}
1681
ret = rmdir(tempdir);
1682
if(ret == -1 and errno != ENOENT){
1683
perror("rmdir");
3064
1684
}
3065
1685
}
3066
1686
3071
1691
&old_sigterm_action,
3072
1692
NULL));
3073
1693
if(ret == -1){
3074
perror_plus("sigaction");
1694
perror("sigaction");
3075
1695
}
3076
1696
do {
3077
1697
ret = raise(signal_received);
3078
1698
} while(ret != 0 and errno == EINTR);
3079
1699
if(ret != 0){
3080
perror_plus("raise");
1700
perror("raise");
3081
1701
abort();
3082
1702
}
3083
1703
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0