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- Committer: Teddy Hogeborn
- Date: 2012-06-07 21:00:57 UTC
- mto: This revision was merged to the branch mainline in revision 596.
- Revision ID: teddy@recompile.se-20120607210057-9k4mou58uht7sj2m
* plugins.d/mandos-client.c (bring_up_interface): Bug fix: Return
errno code. Don't
modify errno.
errno code. Don't
modify errno.
- files added:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
41
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
42
45
#include <stddef.h> /* NULL, size_t, ssize_t */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
45
48
#include <stdbool.h> /* bool, false, true */
46
49
#include <string.h> /* memset(), strcmp(), strlen(),
47
50
strerror(), asprintf(), strcpy() */
50
53
sockaddr_in6, PF_INET6,
51
54
SOCK_STREAM, uid_t, gid_t, open(),
52
55
opendir(), DIR */
53
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
54
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
58
inet_pton(), connect() */
56
59
#include <fcntl.h> /* open() */
57
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
58
61
*/
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
60
64
#include <assert.h> /* assert() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
63
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
64
69
SIOCSIFFLAGS, if_indextoname(),
65
70
if_nametoindex(), IF_NAMESIZE */
67
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
73
*/
69
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
73
78
#include <iso646.h> /* not, or, and */
74
79
#include <argp.h> /* struct argp_option, error_t, struct
75
80
argp_state, struct argp,
76
81
argp_parse(), ARGP_KEY_ARG,
77
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
78
92
#ifdef __linux__
79
93
#include <sys/klog.h> /* klogctl() */
80
#endif
94
#endif /* __linux__ */
81
95
82
96
/* Avahi */
83
97
/* All Avahi types, constants and functions
97
111
init_gnutls_session(),
98
112
GNUTLS_* */
99
113
#include <gnutls/openpgp.h>
100
/* gnutls_certificate_set_openpgp_key_file(),
101
GNUTLS_OPENPGP_FMT_BASE64 */
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
102
116
103
117
/* GPGME */
104
118
#include <gpgme.h> /* All GPGME types, constants and
112
126
#define PATHDIR "/conf/conf.d/mandos"
113
127
#define SECKEY "seckey.txt"
114
128
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
115
130
116
131
bool debug = false;
117
132
static const char mandos_protocol_version[] = "1";
118
133
const char *argp_program_version = "mandos-client " VERSION;
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
static const char sys_class_net[] = "/sys/class/net";
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
uid_t uid = 65534;
139
gid_t gid = 65534;
140
141
/* Doubly linked list that need to be circularly linked when used */
142
typedef struct server{
143
const char *ip;
144
uint16_t port;
145
AvahiIfIndex if_index;
146
int af;
147
struct timespec last_seen;
148
struct server *next;
149
struct server *prev;
150
} server;
120
151
121
152
/* Used for passing in values through the Avahi callback functions */
122
153
typedef struct {
127
158
gnutls_dh_params_t dh_params;
128
159
const char *priority;
129
160
gpgme_ctx_t ctx;
161
server *current_server;
130
162
} mandos_context;
131
163
164
/* global context so signal handler can reach it*/
165
mandos_context mc = { .simple_poll = NULL, .server = NULL,
166
.dh_bits = 1024, .priority = "SECURE256"
167
":!CTYPE-X.509:+CTYPE-OPENPGP",
168
.current_server = NULL };
169
170
sig_atomic_t quit_now = 0;
171
int signal_received = 0;
172
173
/* Function to use when printing errors */
174
void perror_plus(const char *print_text){
175
int e = errno;
176
fprintf(stderr, "Mandos plugin %s: ",
177
program_invocation_short_name);
178
errno = e;
179
perror(print_text);
180
}
181
182
__attribute__((format (gnu_printf, 2, 3)))
183
int fprintf_plus(FILE *stream, const char *format, ...){
184
va_list ap;
185
va_start (ap, format);
186
187
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
188
program_invocation_short_name));
189
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
190
}
191
132
192
/*
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
193
* Make additional room in "buffer" for at least BUFFER_SIZE more
194
* bytes. "buffer_capacity" is how much is currently allocated,
135
195
* "buffer_length" is how much is already used.
136
196
*/
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
138
size_t buffer_capacity){
197
size_t incbuffer(char **buffer, size_t buffer_length,
198
size_t buffer_capacity){
139
199
if(buffer_length + BUFFER_SIZE > buffer_capacity){
140
200
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
141
201
if(buffer == NULL){
146
206
return buffer_capacity;
147
207
}
148
208
209
/* Add server to set of servers to retry periodically */
210
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
211
int af){
212
int ret;
213
server *new_server = malloc(sizeof(server));
214
if(new_server == NULL){
215
perror_plus("malloc");
216
return false;
217
}
218
*new_server = (server){ .ip = strdup(ip),
219
.port = port,
220
.if_index = if_index,
221
.af = af };
222
if(new_server->ip == NULL){
223
perror_plus("strdup");
224
return false;
225
}
226
/* Special case of first server */
227
if (mc.current_server == NULL){
228
new_server->next = new_server;
229
new_server->prev = new_server;
230
mc.current_server = new_server;
231
/* Place the new server last in the list */
232
} else {
233
new_server->next = mc.current_server;
234
new_server->prev = mc.current_server->prev;
235
new_server->prev->next = new_server;
236
mc.current_server->prev = new_server;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
242
}
243
return true;
244
}
245
149
246
/*
150
247
* Initialize GPGME.
151
248
*/
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
153
const char *pubkey, const char *tempdir){
154
int ret;
249
static bool init_gpgme(const char *seckey, const char *pubkey,
250
const char *tempdir){
155
251
gpgme_error_t rc;
156
252
gpgme_engine_info_t engine_info;
157
253
160
256
* Helper function to insert pub and seckey to the engine keyring.
161
257
*/
162
258
bool import_key(const char *filename){
259
int ret;
163
260
int fd;
164
261
gpgme_data_t pgp_data;
165
262
166
263
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
167
264
if(fd == -1){
168
perror("open");
265
perror_plus("open");
169
266
return false;
170
267
}
171
268
172
269
rc = gpgme_data_new_from_fd(&pgp_data, fd);
173
270
if(rc != GPG_ERR_NO_ERROR){
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
176
273
return false;
177
274
}
178
275
179
rc = gpgme_op_import(mc->ctx, pgp_data);
276
rc = gpgme_op_import(mc.ctx, pgp_data);
180
277
if(rc != GPG_ERR_NO_ERROR){
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
gpgme_strsource(rc), gpgme_strerror(rc));
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
183
280
return false;
184
281
}
185
282
186
283
ret = (int)TEMP_FAILURE_RETRY(close(fd));
187
284
if(ret == -1){
188
perror("close");
285
perror_plus("close");
189
286
}
190
287
gpgme_data_release(pgp_data);
191
288
return true;
192
289
}
193
290
194
291
if(debug){
195
fprintf(stderr, "Initialize gpgme\n");
292
fprintf_plus(stderr, "Initializing GPGME\n");
196
293
}
197
294
198
295
/* Init GPGME */
199
296
gpgme_check_version(NULL);
200
297
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
201
298
if(rc != GPG_ERR_NO_ERROR){
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
204
301
return false;
205
302
}
206
303
207
/* Set GPGME home directory for the OpenPGP engine only */
304
/* Set GPGME home directory for the OpenPGP engine only */
208
305
rc = gpgme_get_engine_info(&engine_info);
209
306
if(rc != GPG_ERR_NO_ERROR){
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
211
gpgme_strsource(rc), gpgme_strerror(rc));
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
212
309
return false;
213
310
}
214
311
while(engine_info != NULL){
220
317
engine_info = engine_info->next;
221
318
}
222
319
if(engine_info == NULL){
223
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
224
322
return false;
225
323
}
226
324
227
325
/* Create new GPGME "context" */
228
rc = gpgme_new(&(mc->ctx));
326
rc = gpgme_new(&(mc.ctx));
229
327
if(rc != GPG_ERR_NO_ERROR){
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
232
331
return false;
233
332
}
234
333
236
335
return false;
237
336
}
238
337
239
return true;
338
return true;
240
339
}
241
340
242
341
/*
243
342
* Decrypt OpenPGP data.
244
343
* Returns -1 on error
245
344
*/
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
345
static ssize_t pgp_packet_decrypt(const char *cryptotext,
248
346
size_t crypto_size,
249
347
char **plaintext){
250
348
gpgme_data_t dh_crypto, dh_plain;
254
352
ssize_t plaintext_length = 0;
255
353
256
354
if(debug){
257
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
355
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
258
356
}
259
357
260
358
/* Create new GPGME data buffer from memory cryptotext */
261
359
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
262
360
0);
263
361
if(rc != GPG_ERR_NO_ERROR){
264
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
362
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
363
gpgme_strsource(rc), gpgme_strerror(rc));
266
364
return -1;
267
365
}
268
366
269
367
/* Create new empty GPGME data buffer for the plaintext */
270
368
rc = gpgme_data_new(&dh_plain);
271
369
if(rc != GPG_ERR_NO_ERROR){
272
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
370
fprintf_plus(stderr, "Mandos plugin mandos-client: "
371
"bad gpgme_data_new: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
274
373
gpgme_data_release(dh_crypto);
275
374
return -1;
276
375
}
277
376
278
377
/* Decrypt data from the cryptotext data buffer to the plaintext
279
378
data buffer */
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
379
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
281
380
if(rc != GPG_ERR_NO_ERROR){
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
381
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
382
gpgme_strsource(rc), gpgme_strerror(rc));
284
383
plaintext_length = -1;
285
384
if(debug){
286
385
gpgme_decrypt_result_t result;
287
result = gpgme_op_decrypt_result(mc->ctx);
386
result = gpgme_op_decrypt_result(mc.ctx);
288
387
if(result == NULL){
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
388
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
290
389
} else {
291
fprintf(stderr, "Unsupported algorithm: %s\n",
292
result->unsupported_algorithm);
293
fprintf(stderr, "Wrong key usage: %u\n",
294
result->wrong_key_usage);
390
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
391
result->unsupported_algorithm);
392
fprintf_plus(stderr, "Wrong key usage: %u\n",
393
result->wrong_key_usage);
295
394
if(result->file_name != NULL){
296
fprintf(stderr, "File name: %s\n", result->file_name);
395
fprintf_plus(stderr, "File name: %s\n", result->file_name);
297
396
}
298
397
gpgme_recipient_t recipient;
299
398
recipient = result->recipients;
300
if(recipient){
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
307
? "No" : "Yes");
308
recipient = recipient->next;
309
}
399
while(recipient != NULL){
400
fprintf_plus(stderr, "Public key algorithm: %s\n",
401
gpgme_pubkey_algo_name
402
(recipient->pubkey_algo));
403
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
404
fprintf_plus(stderr, "Secret key available: %s\n",
405
recipient->status == GPG_ERR_NO_SECKEY
406
? "No" : "Yes");
407
recipient = recipient->next;
310
408
}
311
409
}
312
410
}
314
412
}
315
413
316
414
if(debug){
317
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
415
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
318
416
}
319
417
320
418
/* Seek back to the beginning of the GPGME plaintext data buffer */
321
419
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
322
perror("gpgme_data_seek");
420
perror_plus("gpgme_data_seek");
323
421
plaintext_length = -1;
324
422
goto decrypt_end;
325
423
}
326
424
327
425
*plaintext = NULL;
328
426
while(true){
329
plaintext_capacity = adjustbuffer(plaintext,
330
(size_t)plaintext_length,
331
plaintext_capacity);
427
plaintext_capacity = incbuffer(plaintext,
428
(size_t)plaintext_length,
429
plaintext_capacity);
332
430
if(plaintext_capacity == 0){
333
perror("adjustbuffer");
334
plaintext_length = -1;
335
goto decrypt_end;
431
perror_plus("incbuffer");
432
plaintext_length = -1;
433
goto decrypt_end;
336
434
}
337
435
338
436
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
343
441
break;
344
442
}
345
443
if(ret < 0){
346
perror("gpgme_data_read");
444
perror_plus("gpgme_data_read");
347
445
plaintext_length = -1;
348
446
goto decrypt_end;
349
447
}
351
449
}
352
450
353
451
if(debug){
354
fprintf(stderr, "Decrypted password is: ");
452
fprintf_plus(stderr, "Decrypted password is: ");
355
453
for(ssize_t i = 0; i < plaintext_length; i++){
356
454
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
357
455
}
379
477
/* GnuTLS log function callback */
380
478
static void debuggnutls(__attribute__((unused)) int level,
381
479
const char* string){
382
fprintf(stderr, "GnuTLS: %s", string);
480
fprintf_plus(stderr, "GnuTLS: %s", string);
383
481
}
384
482
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
483
static int init_gnutls_global(const char *pubkeyfilename,
387
484
const char *seckeyfilename){
388
485
int ret;
389
486
390
487
if(debug){
391
fprintf(stderr, "Initializing GnuTLS\n");
488
fprintf_plus(stderr, "Initializing GnuTLS\n");
392
489
}
393
490
394
491
ret = gnutls_global_init();
395
492
if(ret != GNUTLS_E_SUCCESS){
396
fprintf(stderr, "GnuTLS global_init: %s\n",
397
safer_gnutls_strerror(ret));
493
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
494
safer_gnutls_strerror(ret));
398
495
return -1;
399
496
}
400
497
407
504
}
408
505
409
506
/* OpenPGP credentials */
410
gnutls_certificate_allocate_credentials(&mc->cred);
507
ret = gnutls_certificate_allocate_credentials(&mc.cred);
411
508
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
from
414
-Wunreachable-code
415
*/
416
safer_gnutls_strerror(ret));
509
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
510
safer_gnutls_strerror(ret));
417
511
gnutls_global_deinit();
418
512
return -1;
419
513
}
420
514
421
515
if(debug){
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
424
seckeyfilename);
516
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
517
" secret key %s as GnuTLS credentials\n",
518
pubkeyfilename,
519
seckeyfilename);
425
520
}
426
521
427
522
ret = gnutls_certificate_set_openpgp_key_file
428
(mc->cred, pubkeyfilename, seckeyfilename,
523
(mc.cred, pubkeyfilename, seckeyfilename,
429
524
GNUTLS_OPENPGP_FMT_BASE64);
430
525
if(ret != GNUTLS_E_SUCCESS){
431
fprintf(stderr,
432
"Error[%d] while reading the OpenPGP key pair ('%s',"
433
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
526
fprintf_plus(stderr,
527
"Error[%d] while reading the OpenPGP key pair ('%s',"
528
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
529
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
530
safer_gnutls_strerror(ret));
436
531
goto globalfail;
437
532
}
438
533
439
534
/* GnuTLS server initialization */
440
ret = gnutls_dh_params_init(&mc->dh_params);
535
ret = gnutls_dh_params_init(&mc.dh_params);
441
536
if(ret != GNUTLS_E_SUCCESS){
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
" %s\n", safer_gnutls_strerror(ret));
537
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
538
" initialization: %s\n",
539
safer_gnutls_strerror(ret));
444
540
goto globalfail;
445
541
}
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
542
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
447
543
if(ret != GNUTLS_E_SUCCESS){
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
safer_gnutls_strerror(ret));
544
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
545
safer_gnutls_strerror(ret));
450
546
goto globalfail;
451
547
}
452
548
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
549
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
454
550
455
551
return 0;
456
552
457
553
globalfail:
458
554
459
gnutls_certificate_free_credentials(mc->cred);
555
gnutls_certificate_free_credentials(mc.cred);
460
556
gnutls_global_deinit();
461
gnutls_dh_params_deinit(mc->dh_params);
557
gnutls_dh_params_deinit(mc.dh_params);
462
558
return -1;
463
559
}
464
560
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
561
static int init_gnutls_session(gnutls_session_t *session){
467
562
int ret;
468
563
/* GnuTLS session creation */
469
ret = gnutls_init(session, GNUTLS_SERVER);
564
do {
565
ret = gnutls_init(session, GNUTLS_SERVER);
566
if(quit_now){
567
return -1;
568
}
569
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
470
570
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
safer_gnutls_strerror(ret));
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
473
574
}
474
575
475
576
{
476
577
const char *err;
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
578
do {
579
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
580
if(quit_now){
581
gnutls_deinit(*session);
582
return -1;
583
}
584
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
478
585
if(ret != GNUTLS_E_SUCCESS){
479
fprintf(stderr, "Syntax error at: %s\n", err);
480
fprintf(stderr, "GnuTLS error: %s\n",
481
safer_gnutls_strerror(ret));
586
fprintf_plus(stderr, "Syntax error at: %s\n", err);
587
fprintf_plus(stderr, "GnuTLS error: %s\n",
588
safer_gnutls_strerror(ret));
482
589
gnutls_deinit(*session);
483
590
return -1;
484
591
}
485
592
}
486
593
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
594
do {
595
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
596
mc.cred);
597
if(quit_now){
598
gnutls_deinit(*session);
599
return -1;
600
}
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
489
602
if(ret != GNUTLS_E_SUCCESS){
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
safer_gnutls_strerror(ret));
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
492
605
gnutls_deinit(*session);
493
606
return -1;
494
607
}
495
608
496
609
/* ignore client certificate if any. */
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
610
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
499
611
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
612
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
501
613
502
614
return 0;
503
615
}
509
621
/* Called when a Mandos server is found */
510
622
static int start_mandos_communication(const char *ip, uint16_t port,
511
623
AvahiIfIndex if_index,
512
mandos_context *mc, int af){
513
int ret, tcp_sd;
624
int af){
625
int ret, tcp_sd = -1;
514
626
ssize_t sret;
515
627
union {
516
628
struct sockaddr_in in;
517
629
struct sockaddr_in6 in6;
518
630
} to;
519
631
char *buffer = NULL;
520
char *decrypted_buffer;
632
char *decrypted_buffer = NULL;
521
633
size_t buffer_length = 0;
522
634
size_t buffer_capacity = 0;
523
ssize_t decrypted_buffer_size;
524
635
size_t written;
525
int retval = 0;
636
int retval = -1;
526
637
gnutls_session_t session;
527
638
int pf; /* Protocol family */
528
639
640
errno = 0;
641
642
if(quit_now){
643
errno = EINTR;
644
return -1;
645
}
646
529
647
switch(af){
530
648
case AF_INET6:
531
649
pf = PF_INET6;
534
652
pf = PF_INET;
535
653
break;
536
654
default:
537
fprintf(stderr, "Bad address family: %d\n", af);
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
656
errno = EINVAL;
538
657
return -1;
539
658
}
540
659
541
ret = init_gnutls_session(mc, &session);
660
ret = init_gnutls_session(&session);
542
661
if(ret != 0){
543
662
return -1;
544
663
}
545
664
546
665
if(debug){
547
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
548
"\n", ip, port);
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIu16 "\n", ip, port);
549
668
}
550
669
551
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
552
671
if(tcp_sd < 0){
553
perror("socket");
554
return -1;
672
int e = errno;
673
perror_plus("socket");
674
errno = e;
675
goto mandos_end;
676
}
677
678
if(quit_now){
679
errno = EINTR;
680
goto mandos_end;
555
681
}
556
682
557
683
memset(&to, 0, sizeof(to));
558
684
if(af == AF_INET6){
559
to.in6.sin6_family = (uint16_t)af;
685
to.in6.sin6_family = (sa_family_t)af;
560
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
561
687
} else { /* IPv4 */
562
688
to.in.sin_family = (sa_family_t)af;
563
689
ret = inet_pton(af, ip, &to.in.sin_addr);
564
690
}
565
691
if(ret < 0 ){
566
perror("inet_pton");
567
return -1;
692
int e = errno;
693
perror_plus("inet_pton");
694
errno = e;
695
goto mandos_end;
568
696
}
569
697
if(ret == 0){
570
fprintf(stderr, "Bad address: %s\n", ip);
571
return -1;
698
int e = errno;
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
700
errno = e;
701
goto mandos_end;
572
702
}
573
703
if(af == AF_INET6){
574
704
to.in6.sin6_port = htons(port); /* Spurious warnings from
577
707
578
708
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
579
709
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
580
-Wunreachable-code*/
710
-Wunreachable-code*/
581
711
if(if_index == AVAHI_IF_UNSPEC){
582
fprintf(stderr, "An IPv6 link-local address is incomplete"
583
" without a network interface\n");
584
return -1;
712
fprintf_plus(stderr, "An IPv6 link-local address is"
713
" incomplete without a network interface\n");
714
errno = EINVAL;
715
goto mandos_end;
585
716
}
586
717
/* Set the network interface number as scope */
587
718
to.in6.sin6_scope_id = (uint32_t)if_index;
592
723
-Wunreachable-code */
593
724
}
594
725
726
if(quit_now){
727
errno = EINTR;
728
goto mandos_end;
729
}
730
595
731
if(debug){
596
732
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
597
733
char interface[IF_NAMESIZE];
598
734
if(if_indextoname((unsigned int)if_index, interface) == NULL){
599
perror("if_indextoname");
735
perror_plus("if_indextoname");
600
736
} else {
601
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
602
ip, interface, port);
737
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
738
"\n", ip, interface, port);
603
739
}
604
740
} else {
605
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
606
port);
741
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
742
ip, port);
607
743
}
608
744
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
609
745
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
616
752
sizeof(addrstr));
617
753
}
618
754
if(pcret == NULL){
619
perror("inet_ntop");
755
perror_plus("inet_ntop");
620
756
} else {
621
757
if(strcmp(addrstr, ip) != 0){
622
fprintf(stderr, "Canonical address form: %s\n", addrstr);
758
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
623
759
}
624
760
}
625
761
}
626
762
763
if(quit_now){
764
errno = EINTR;
765
goto mandos_end;
766
}
767
627
768
if(af == AF_INET6){
628
769
ret = connect(tcp_sd, &to.in6, sizeof(to));
629
770
} else {
630
771
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
631
772
}
632
773
if(ret < 0){
633
perror("connect");
634
return -1;
774
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
775
int e = errno;
776
perror_plus("connect");
777
errno = e;
778
}
779
goto mandos_end;
780
}
781
782
if(quit_now){
783
errno = EINTR;
784
goto mandos_end;
635
785
}
636
786
637
787
const char *out = mandos_protocol_version;
639
789
while(true){
640
790
size_t out_size = strlen(out);
641
791
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
642
out_size - written));
792
out_size - written));
643
793
if(ret == -1){
644
perror("write");
645
retval = -1;
794
int e = errno;
795
perror_plus("write");
796
errno = e;
646
797
goto mandos_end;
647
798
}
648
799
written += (size_t)ret;
656
807
break;
657
808
}
658
809
}
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
659
815
}
660
816
661
817
if(debug){
662
fprintf(stderr, "Establishing TLS session with %s\n", ip);
663
}
664
665
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
666
667
do{
818
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
819
}
820
821
if(quit_now){
822
errno = EINTR;
823
goto mandos_end;
824
}
825
826
/* This casting via intptr_t is to eliminate warning about casting
827
an int to a pointer type. This is exactly how the GnuTLS Guile
828
function "set-session-transport-fd!" does it. */
829
gnutls_transport_set_ptr(session,
830
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
831
832
if(quit_now){
833
errno = EINTR;
834
goto mandos_end;
835
}
836
837
do {
668
838
ret = gnutls_handshake(session);
839
if(quit_now){
840
errno = EINTR;
841
goto mandos_end;
842
}
669
843
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
670
844
671
845
if(ret != GNUTLS_E_SUCCESS){
672
846
if(debug){
673
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
847
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
674
848
gnutls_perror(ret);
675
849
}
676
retval = -1;
850
errno = EPROTO;
677
851
goto mandos_end;
678
852
}
679
853
680
854
/* Read OpenPGP packet that contains the wanted password */
681
855
682
856
if(debug){
683
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
684
ip);
857
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
858
" %s\n", ip);
685
859
}
686
860
687
861
while(true){
688
buffer_capacity = adjustbuffer(&buffer, buffer_length,
689
buffer_capacity);
862
863
if(quit_now){
864
errno = EINTR;
865
goto mandos_end;
866
}
867
868
buffer_capacity = incbuffer(&buffer, buffer_length,
869
buffer_capacity);
690
870
if(buffer_capacity == 0){
691
perror("adjustbuffer");
692
retval = -1;
871
int e = errno;
872
perror_plus("incbuffer");
873
errno = e;
874
goto mandos_end;
875
}
876
877
if(quit_now){
878
errno = EINTR;
693
879
goto mandos_end;
694
880
}
695
881
704
890
case GNUTLS_E_AGAIN:
705
891
break;
706
892
case GNUTLS_E_REHANDSHAKE:
707
do{
893
do {
708
894
ret = gnutls_handshake(session);
895
896
if(quit_now){
897
errno = EINTR;
898
goto mandos_end;
899
}
709
900
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
710
901
if(ret < 0){
711
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
902
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
903
"***\n");
712
904
gnutls_perror(ret);
713
retval = -1;
905
errno = EPROTO;
714
906
goto mandos_end;
715
907
}
716
908
break;
717
909
default:
718
fprintf(stderr, "Unknown error while reading data from"
719
" encrypted session with Mandos server\n");
720
retval = -1;
910
fprintf_plus(stderr, "Unknown error while reading data from"
911
" encrypted session with Mandos server\n");
721
912
gnutls_bye(session, GNUTLS_SHUT_RDWR);
913
errno = EIO;
722
914
goto mandos_end;
723
915
}
724
916
} else {
727
919
}
728
920
729
921
if(debug){
730
fprintf(stderr, "Closing TLS session\n");
731
}
732
733
gnutls_bye(session, GNUTLS_SHUT_RDWR);
922
fprintf_plus(stderr, "Closing TLS session\n");
923
}
924
925
if(quit_now){
926
errno = EINTR;
927
goto mandos_end;
928
}
929
930
do {
931
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
932
if(quit_now){
933
errno = EINTR;
934
goto mandos_end;
935
}
936
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
734
937
735
938
if(buffer_length > 0){
736
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
737
buffer_length,
939
ssize_t decrypted_buffer_size;
940
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
738
941
&decrypted_buffer);
739
942
if(decrypted_buffer_size >= 0){
943
740
944
written = 0;
741
945
while(written < (size_t) decrypted_buffer_size){
946
if(quit_now){
947
errno = EINTR;
948
goto mandos_end;
949
}
950
742
951
ret = (int)fwrite(decrypted_buffer + written, 1,
743
952
(size_t)decrypted_buffer_size - written,
744
953
stdout);
745
954
if(ret == 0 and ferror(stdout)){
955
int e = errno;
746
956
if(debug){
747
fprintf(stderr, "Error writing encrypted data: %s\n",
748
strerror(errno));
957
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
958
strerror(errno));
749
959
}
750
retval = -1;
751
break;
960
errno = e;
961
goto mandos_end;
752
962
}
753
963
written += (size_t)ret;
754
964
}
755
free(decrypted_buffer);
756
} else {
757
retval = -1;
965
retval = 0;
758
966
}
759
} else {
760
retval = -1;
761
967
}
762
968
763
969
/* Shutdown procedure */
764
970
765
971
mandos_end:
766
free(buffer);
767
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
768
if(ret == -1){
769
perror("close");
972
{
973
int e = errno;
974
free(decrypted_buffer);
975
free(buffer);
976
if(tcp_sd >= 0){
977
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
978
}
979
if(ret == -1){
980
if(e == 0){
981
e = errno;
982
}
983
perror_plus("close");
984
}
985
gnutls_deinit(session);
986
errno = e;
987
if(quit_now){
988
errno = EINTR;
989
retval = -1;
990
}
770
991
}
771
gnutls_deinit(session);
772
992
return retval;
773
993
}
774
994
785
1005
AVAHI_GCC_UNUSED AvahiStringList *txt,
786
1006
AVAHI_GCC_UNUSED AvahiLookupResultFlags
787
1007
flags,
788
void* userdata){
789
mandos_context *mc = userdata;
1008
AVAHI_GCC_UNUSED void* userdata){
790
1009
assert(r);
791
1010
792
1011
/* Called whenever a service has been resolved successfully or
793
1012
timed out */
794
1013
1014
if(quit_now){
1015
return;
1016
}
1017
795
1018
switch(event){
796
1019
default:
797
1020
case AVAHI_RESOLVER_FAILURE:
798
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
799
" of type '%s' in domain '%s': %s\n", name, type, domain,
800
avahi_strerror(avahi_server_errno(mc->server)));
1021
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1022
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1023
domain,
1024
avahi_strerror(avahi_server_errno(mc.server)));
801
1025
break;
802
1026
803
1027
case AVAHI_RESOLVER_FOUND:
805
1029
char ip[AVAHI_ADDRESS_STR_MAX];
806
1030
avahi_address_snprint(ip, sizeof(ip), address);
807
1031
if(debug){
808
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
809
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
810
ip, (intmax_t)interface, port);
1032
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1033
PRIdMAX ") on port %" PRIu16 "\n", name,
1034
host_name, ip, (intmax_t)interface, port);
811
1035
}
812
int ret = start_mandos_communication(ip, port, interface, mc,
1036
int ret = start_mandos_communication(ip, port, interface,
813
1037
avahi_proto_to_af(proto));
814
1038
if(ret == 0){
815
avahi_simple_poll_quit(mc->simple_poll);
1039
avahi_simple_poll_quit(mc.simple_poll);
1040
} else {
1041
if(not add_server(ip, port, interface,
1042
avahi_proto_to_af(proto))){
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1044
" list\n", name);
1045
}
816
1046
}
817
1047
}
818
1048
}
828
1058
const char *domain,
829
1059
AVAHI_GCC_UNUSED AvahiLookupResultFlags
830
1060
flags,
831
void* userdata){
832
mandos_context *mc = userdata;
1061
AVAHI_GCC_UNUSED void* userdata){
833
1062
assert(b);
834
1063
835
1064
/* Called whenever a new services becomes available on the LAN or
836
1065
is removed from the LAN */
837
1066
1067
if(quit_now){
1068
return;
1069
}
1070
838
1071
switch(event){
839
1072
default:
840
1073
case AVAHI_BROWSER_FAILURE:
841
1074
842
fprintf(stderr, "(Avahi browser) %s\n",
843
avahi_strerror(avahi_server_errno(mc->server)));
844
avahi_simple_poll_quit(mc->simple_poll);
1075
fprintf_plus(stderr, "(Avahi browser) %s\n",
1076
avahi_strerror(avahi_server_errno(mc.server)));
1077
avahi_simple_poll_quit(mc.simple_poll);
845
1078
return;
846
1079
847
1080
case AVAHI_BROWSER_NEW:
850
1083
the callback function is called the Avahi server will free the
851
1084
resolver for us. */
852
1085
853
if(!(avahi_s_service_resolver_new(mc->server, interface,
854
protocol, name, type, domain,
855
AVAHI_PROTO_INET6, 0,
856
resolve_callback, mc)))
857
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
858
name, avahi_strerror(avahi_server_errno(mc->server)));
1086
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1087
name, type, domain, protocol, 0,
1088
resolve_callback, NULL) == NULL)
1089
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1090
" %s\n", name,
1091
avahi_strerror(avahi_server_errno(mc.server)));
859
1092
break;
860
1093
861
1094
case AVAHI_BROWSER_REMOVE:
864
1097
case AVAHI_BROWSER_ALL_FOR_NOW:
865
1098
case AVAHI_BROWSER_CACHE_EXHAUSTED:
866
1099
if(debug){
867
fprintf(stderr, "No Mandos server found, still searching...\n");
1100
fprintf_plus(stderr, "No Mandos server found, still"
1101
" searching...\n");
868
1102
}
869
1103
break;
870
1104
}
871
1105
}
872
1106
1107
/* Signal handler that stops main loop after SIGTERM */
1108
static void handle_sigterm(int sig){
1109
if(quit_now){
1110
return;
1111
}
1112
quit_now = 1;
1113
signal_received = sig;
1114
int old_errno = errno;
1115
/* set main loop to exit */
1116
if(mc.simple_poll != NULL){
1117
avahi_simple_poll_quit(mc.simple_poll);
1118
}
1119
errno = old_errno;
1120
}
1121
1122
bool get_flags(const char *ifname, struct ifreq *ifr){
1123
int ret;
1124
1125
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1126
if(s < 0){
1127
perror_plus("socket");
1128
return false;
1129
}
1130
strcpy(ifr->ifr_name, ifname);
1131
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1132
if(ret == -1){
1133
if(debug){
1134
perror_plus("ioctl SIOCGIFFLAGS");
1135
}
1136
return false;
1137
}
1138
return true;
1139
}
1140
1141
bool good_flags(const char *ifname, const struct ifreq *ifr){
1142
1143
/* Reject the loopback device */
1144
if(ifr->ifr_flags & IFF_LOOPBACK){
1145
if(debug){
1146
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1147
ifname);
1148
}
1149
return false;
1150
}
1151
/* Accept point-to-point devices only if connect_to is specified */
1152
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1153
if(debug){
1154
fprintf_plus(stderr, "Accepting point-to-point interface"
1155
" \"%s\"\n", ifname);
1156
}
1157
return true;
1158
}
1159
/* Otherwise, reject non-broadcast-capable devices */
1160
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1161
if(debug){
1162
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1163
" \"%s\"\n", ifname);
1164
}
1165
return false;
1166
}
1167
/* Reject non-ARP interfaces (including dummy interfaces) */
1168
if(ifr->ifr_flags & IFF_NOARP){
1169
if(debug){
1170
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1171
ifname);
1172
}
1173
return false;
1174
}
1175
1176
/* Accept this device */
1177
if(debug){
1178
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1179
}
1180
return true;
1181
}
1182
1183
/*
1184
* This function determines if a directory entry in /sys/class/net
1185
* corresponds to an acceptable network device.
1186
* (This function is passed to scandir(3) as a filter function.)
1187
*/
1188
int good_interface(const struct dirent *if_entry){
1189
if(if_entry->d_name[0] == '.'){
1190
return 0;
1191
}
1192
1193
struct ifreq ifr;
1194
if(not get_flags(if_entry->d_name, &ifr)){
1195
if(debug){
1196
fprintf_plus(stderr, "Failed to get flags for interface "
1197
"\"%s\"\n", if_entry->d_name);
1198
}
1199
return 0;
1200
}
1201
1202
if(not good_flags(if_entry->d_name, &ifr)){
1203
return 0;
1204
}
1205
return 1;
1206
}
1207
1208
/*
1209
* This function determines if a directory entry in /sys/class/net
1210
* corresponds to an acceptable network device which is up.
1211
* (This function is passed to scandir(3) as a filter function.)
1212
*/
1213
int up_interface(const struct dirent *if_entry){
1214
if(if_entry->d_name[0] == '.'){
1215
return 0;
1216
}
1217
1218
struct ifreq ifr;
1219
if(not get_flags(if_entry->d_name, &ifr)){
1220
if(debug){
1221
fprintf_plus(stderr, "Failed to get flags for interface "
1222
"\"%s\"\n", if_entry->d_name);
1223
}
1224
return 0;
1225
}
1226
1227
/* Reject down interfaces */
1228
if(not (ifr.ifr_flags & IFF_UP)){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1231
if_entry->d_name);
1232
}
1233
return 0;
1234
}
1235
1236
/* Reject non-running interfaces */
1237
if(not (ifr.ifr_flags & IFF_RUNNING)){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
if(not good_flags(if_entry->d_name, &ifr)){
1246
return 0;
1247
}
1248
return 1;
1249
}
1250
1251
int notdotentries(const struct dirent *direntry){
1252
/* Skip "." and ".." */
1253
if(direntry->d_name[0] == '.'
1254
and (direntry->d_name[1] == '\0'
1255
or (direntry->d_name[1] == '.'
1256
and direntry->d_name[2] == '\0'))){
1257
return 0;
1258
}
1259
return 1;
1260
}
1261
1262
/* Is this directory entry a runnable program? */
1263
int runnable_hook(const struct dirent *direntry){
1264
int ret;
1265
size_t sret;
1266
struct stat st;
1267
1268
if((direntry->d_name)[0] == '\0'){
1269
/* Empty name? */
1270
return 0;
1271
}
1272
1273
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1274
"abcdefghijklmnopqrstuvwxyz"
1275
"0123456789"
1276
"_-");
1277
if((direntry->d_name)[sret] != '\0'){
1278
/* Contains non-allowed characters */
1279
if(debug){
1280
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1281
direntry->d_name);
1282
}
1283
return 0;
1284
}
1285
1286
char *fullname = NULL;
1287
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1288
if(ret < 0){
1289
perror_plus("asprintf");
1290
return 0;
1291
}
1292
1293
ret = stat(fullname, &st);
1294
if(ret == -1){
1295
if(debug){
1296
perror_plus("Could not stat hook");
1297
}
1298
return 0;
1299
}
1300
if(not (S_ISREG(st.st_mode))){
1301
/* Not a regular file */
1302
if(debug){
1303
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1304
direntry->d_name);
1305
}
1306
return 0;
1307
}
1308
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1309
/* Not executable */
1310
if(debug){
1311
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1312
direntry->d_name);
1313
}
1314
return 0;
1315
}
1316
if(debug){
1317
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1318
direntry->d_name);
1319
}
1320
return 1;
1321
}
1322
1323
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1324
int ret;
1325
struct timespec now;
1326
struct timespec waited_time;
1327
intmax_t block_time;
1328
1329
while(true){
1330
if(mc.current_server == NULL){
1331
if (debug){
1332
fprintf_plus(stderr, "Wait until first server is found."
1333
" No timeout!\n");
1334
}
1335
ret = avahi_simple_poll_iterate(s, -1);
1336
} else {
1337
if (debug){
1338
fprintf_plus(stderr, "Check current_server if we should run"
1339
" it, or wait\n");
1340
}
1341
/* the current time */
1342
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1343
if(ret == -1){
1344
perror_plus("clock_gettime");
1345
return -1;
1346
}
1347
/* Calculating in ms how long time between now and server
1348
who we visted longest time ago. Now - last seen. */
1349
waited_time.tv_sec = (now.tv_sec
1350
- mc.current_server->last_seen.tv_sec);
1351
waited_time.tv_nsec = (now.tv_nsec
1352
- mc.current_server->last_seen.tv_nsec);
1353
/* total time is 10s/10,000ms.
1354
Converting to s from ms by dividing by 1,000,
1355
and ns to ms by dividing by 1,000,000. */
1356
block_time = ((retry_interval
1357
- ((intmax_t)waited_time.tv_sec * 1000))
1358
- ((intmax_t)waited_time.tv_nsec / 1000000));
1359
1360
if (debug){
1361
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1362
block_time);
1363
}
1364
1365
if(block_time <= 0){
1366
ret = start_mandos_communication(mc.current_server->ip,
1367
mc.current_server->port,
1368
mc.current_server->if_index,
1369
mc.current_server->af);
1370
if(ret == 0){
1371
avahi_simple_poll_quit(mc.simple_poll);
1372
return 0;
1373
}
1374
ret = clock_gettime(CLOCK_MONOTONIC,
1375
&mc.current_server->last_seen);
1376
if(ret == -1){
1377
perror_plus("clock_gettime");
1378
return -1;
1379
}
1380
mc.current_server = mc.current_server->next;
1381
block_time = 0; /* Call avahi to find new Mandos
1382
servers, but don't block */
1383
}
1384
1385
ret = avahi_simple_poll_iterate(s, (int)block_time);
1386
}
1387
if(ret != 0){
1388
if (ret > 0 or errno != EINTR){
1389
return (ret != 1) ? ret : 0;
1390
}
1391
}
1392
}
1393
}
1394
1395
/* Set effective uid to 0, return errno */
1396
int raise_privileges(void){
1397
int old_errno = errno;
1398
int ret_errno = 0;
1399
errno = 0;
1400
if(seteuid(0) == -1){
1401
perror_plus("seteuid");
1402
}
1403
ret_errno = errno;
1404
errno = old_errno;
1405
return ret_errno;
1406
}
1407
1408
/* Set effective and real user ID to 0. Return errno. */
1409
int raise_privileges_permanently(void){
1410
int old_errno = errno;
1411
int ret_errno = raise_privileges();
1412
if(ret_errno != 0){
1413
errno = old_errno;
1414
return ret_errno;
1415
}
1416
errno = 0;
1417
if(setuid(0) == -1){
1418
perror_plus("seteuid");
1419
}
1420
ret_errno = errno;
1421
errno = old_errno;
1422
return ret_errno;
1423
}
1424
1425
/* Set effective user ID to unprivileged saved user ID */
1426
int lower_privileges(void){
1427
int old_errno = errno;
1428
int ret_errno = 0;
1429
errno = 0;
1430
if(seteuid(uid) == -1){
1431
perror_plus("seteuid");
1432
}
1433
ret_errno = errno;
1434
errno = old_errno;
1435
return ret_errno;
1436
}
1437
1438
bool run_network_hooks(const char *mode, const char *interface,
1439
const float delay){
1440
struct dirent **direntries;
1441
struct dirent *direntry;
1442
int ret;
1443
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1444
alphasort);
1445
if(numhooks == -1){
1446
perror_plus("scandir");
1447
} else {
1448
int devnull = open("/dev/null", O_RDONLY);
1449
for(int i = 0; i < numhooks; i++){
1450
direntry = direntries[i];
1451
char *fullname = NULL;
1452
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1453
if(ret < 0){
1454
perror_plus("asprintf");
1455
continue;
1456
}
1457
if(debug){
1458
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1459
direntry->d_name);
1460
}
1461
pid_t hook_pid = fork();
1462
if(hook_pid == 0){
1463
/* Child */
1464
/* Raise privileges */
1465
raise_privileges_permanently();
1466
/* Set group */
1467
errno = 0;
1468
ret = setgid(0);
1469
if(ret == -1){
1470
perror_plus("setgid");
1471
}
1472
/* Reset supplementary groups */
1473
errno = 0;
1474
ret = setgroups(0, NULL);
1475
if(ret == -1){
1476
perror_plus("setgroups");
1477
}
1478
dup2(devnull, STDIN_FILENO);
1479
close(devnull);
1480
dup2(STDERR_FILENO, STDOUT_FILENO);
1481
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1482
if(ret == -1){
1483
perror_plus("setenv");
1484
_exit(EX_OSERR);
1485
}
1486
ret = setenv("DEVICE", interface, 1);
1487
if(ret == -1){
1488
perror_plus("setenv");
1489
_exit(EX_OSERR);
1490
}
1491
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1492
if(ret == -1){
1493
perror_plus("setenv");
1494
_exit(EX_OSERR);
1495
}
1496
ret = setenv("MODE", mode, 1);
1497
if(ret == -1){
1498
perror_plus("setenv");
1499
_exit(EX_OSERR);
1500
}
1501
char *delaystring;
1502
ret = asprintf(&delaystring, "%f", delay);
1503
if(ret == -1){
1504
perror_plus("asprintf");
1505
_exit(EX_OSERR);
1506
}
1507
ret = setenv("DELAY", delaystring, 1);
1508
if(ret == -1){
1509
free(delaystring);
1510
perror_plus("setenv");
1511
_exit(EX_OSERR);
1512
}
1513
free(delaystring);
1514
if(connect_to != NULL){
1515
ret = setenv("CONNECT", connect_to, 1);
1516
if(ret == -1){
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
}
1521
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1522
perror_plus("execl");
1523
_exit(EXIT_FAILURE);
1524
}
1525
} else {
1526
int status;
1527
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1528
perror_plus("waitpid");
1529
free(fullname);
1530
continue;
1531
}
1532
if(WIFEXITED(status)){
1533
if(WEXITSTATUS(status) != 0){
1534
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1535
" with status %d\n", direntry->d_name,
1536
WEXITSTATUS(status));
1537
free(fullname);
1538
continue;
1539
}
1540
} else if(WIFSIGNALED(status)){
1541
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1542
" signal %d\n", direntry->d_name,
1543
WTERMSIG(status));
1544
free(fullname);
1545
continue;
1546
} else {
1547
fprintf_plus(stderr, "Warning: network hook \"%s\""
1548
" crashed\n", direntry->d_name);
1549
free(fullname);
1550
continue;
1551
}
1552
}
1553
free(fullname);
1554
if(debug){
1555
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1556
direntry->d_name);
1557
}
1558
}
1559
close(devnull);
1560
}
1561
return true;
1562
}
1563
1564
int bring_up_interface(const char * const interface, const float delay){
1565
int sd = -1;
1566
int old_errno = errno;
1567
int ret_errno = 0;
1568
int ret;
1569
struct ifreq network;
1570
AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);
1571
if(if_index == 0){
1572
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1573
errno = old_errno;
1574
return ENXIO;
1575
}
1576
1577
if(quit_now){
1578
errno = old_errno;
1579
return EINTR;
1580
}
1581
1582
/* Re-raise priviliges */
1583
raise_privileges();
1584
1585
#ifdef __linux__
1586
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1587
messages about the network interface to mess up the prompt */
1588
ret = klogctl(8, NULL, 5);
1589
bool restore_loglevel = true;
1590
if(ret == -1){
1591
restore_loglevel = false;
1592
perror_plus("klogctl");
1593
}
1594
#endif /* __linux__ */
1595
1596
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1597
if(sd < 0){
1598
ret_errno = errno;
1599
perror_plus("socket");
1600
#ifdef __linux__
1601
if(restore_loglevel){
1602
ret = klogctl(7, NULL, 0);
1603
if(ret == -1){
1604
perror_plus("klogctl");
1605
}
1606
}
1607
#endif /* __linux__ */
1608
/* Lower privileges */
1609
lower_privileges();
1610
errno = old_errno;
1611
return ret_errno;
1612
}
1613
strcpy(network.ifr_name, interface);
1614
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1615
if(ret == -1){
1616
ret_errno = errno;
1617
perror_plus("ioctl SIOCGIFFLAGS");
1618
#ifdef __linux__
1619
if(restore_loglevel){
1620
ret = klogctl(7, NULL, 0);
1621
if(ret == -1){
1622
perror_plus("klogctl");
1623
}
1624
}
1625
#endif /* __linux__ */
1626
/* Lower privileges */
1627
lower_privileges();
1628
errno = old_errno;
1629
return ret_errno;
1630
}
1631
if((network.ifr_flags & IFF_UP) == 0){
1632
network.ifr_flags |= IFF_UP;
1633
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1634
if(ret == -1){
1635
ret_errno = errno;
1636
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1637
#ifdef __linux__
1638
if(restore_loglevel){
1639
ret = klogctl(7, NULL, 0);
1640
if(ret == -1){
1641
perror_plus("klogctl");
1642
}
1643
}
1644
#endif /* __linux__ */
1645
/* Lower privileges */
1646
lower_privileges();
1647
errno = old_errno;
1648
return ret_errno;
1649
}
1650
}
1651
/* Sleep checking until interface is running.
1652
Check every 0.25s, up to total time of delay */
1653
for(int i=0; i < delay * 4; i++){
1654
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1655
if(ret == -1){
1656
perror_plus("ioctl SIOCGIFFLAGS");
1657
} else if(network.ifr_flags & IFF_RUNNING){
1658
break;
1659
}
1660
struct timespec sleeptime = { .tv_nsec = 250000000 };
1661
ret = nanosleep(&sleeptime, NULL);
1662
if(ret == -1 and errno != EINTR){
1663
perror_plus("nanosleep");
1664
}
1665
}
1666
/* Close the socket */
1667
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1668
if(ret == -1){
1669
perror_plus("close");
1670
}
1671
#ifdef __linux__
1672
if(restore_loglevel){
1673
/* Restores kernel loglevel to default */
1674
ret = klogctl(7, NULL, 0);
1675
if(ret == -1){
1676
perror_plus("klogctl");
1677
}
1678
}
1679
#endif /* __linux__ */
1680
/* Lower privileges */
1681
lower_privileges();
1682
errno = old_errno;
1683
return 0;
1684
}
1685
873
1686
int main(int argc, char *argv[]){
874
1687
AvahiSServiceBrowser *sb = NULL;
875
1688
int error;
876
1689
int ret;
877
1690
intmax_t tmpmax;
878
int numchars;
1691
char *tmp;
879
1692
int exitcode = EXIT_SUCCESS;
880
const char *interface = "eth0";
1693
const char *interface = "";
881
1694
struct ifreq network;
882
int sd;
883
uid_t uid;
884
gid_t gid;
885
char *connect_to = NULL;
1695
int sd = -1;
1696
bool take_down_interface = false;
886
1697
char tempdir[] = "/tmp/mandosXXXXXX";
887
1698
bool tempdir_created = false;
888
1699
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
889
1700
const char *seckey = PATHDIR "/" SECKEY;
890
1701
const char *pubkey = PATHDIR "/" PUBKEY;
891
1702
892
mandos_context mc = { .simple_poll = NULL, .server = NULL,
893
.dh_bits = 1024, .priority = "SECURE256"
894
":!CTYPE-X.509:+CTYPE-OPENPGP" };
895
1703
bool gnutls_initialized = false;
896
1704
bool gpgme_initialized = false;
897
double delay = 2.5;
1705
float delay = 2.5f;
1706
double retry_interval = 10; /* 10s between trying a server and
1707
retrying the same server again */
1708
1709
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1710
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1711
1712
uid = getuid();
1713
gid = getgid();
1714
1715
/* Lower any group privileges we might have, just to be safe */
1716
errno = 0;
1717
ret = setgid(gid);
1718
if(ret == -1){
1719
perror_plus("setgid");
1720
}
1721
1722
/* Lower user privileges (temporarily) */
1723
errno = 0;
1724
ret = seteuid(uid);
1725
if(ret == -1){
1726
perror_plus("seteuid");
1727
}
1728
1729
if(quit_now){
1730
goto end;
1731
}
898
1732
899
1733
{
900
1734
struct argp_option options[] = {
930
1764
.arg = "SECONDS",
931
1765
.doc = "Maximum delay to wait for interface startup",
932
1766
.group = 2 },
1767
{ .name = "retry", .key = 132,
1768
.arg = "SECONDS",
1769
.doc = "Retry interval used when denied by the Mandos server",
1770
.group = 2 },
1771
{ .name = "network-hook-dir", .key = 133,
1772
.arg = "DIR",
1773
.doc = "Directory where network hooks are located",
1774
.group = 2 },
1775
/*
1776
* These reproduce what we would get without ARGP_NO_HELP
1777
*/
1778
{ .name = "help", .key = '?',
1779
.doc = "Give this help list", .group = -1 },
1780
{ .name = "usage", .key = -3,
1781
.doc = "Give a short usage message", .group = -1 },
1782
{ .name = "version", .key = 'V',
1783
.doc = "Print program version", .group = -1 },
933
1784
{ .name = NULL }
934
1785
};
935
1786
936
1787
error_t parse_opt(int key, char *arg,
937
1788
struct argp_state *state){
1789
errno = 0;
938
1790
switch(key){
939
1791
case 128: /* --debug */
940
1792
debug = true;
952
1804
pubkey = arg;
953
1805
break;
954
1806
case 129: /* --dh-bits */
955
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
956
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
957
or arg[numchars] != '\0'){
958
fprintf(stderr, "Bad number of DH bits\n");
959
exit(EXIT_FAILURE);
1807
errno = 0;
1808
tmpmax = strtoimax(arg, &tmp, 10);
1809
if(errno != 0 or tmp == arg or *tmp != '\0'
1810
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1811
argp_error(state, "Bad number of DH bits");
960
1812
}
961
1813
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
962
1814
break;
964
1816
mc.priority = arg;
965
1817
break;
966
1818
case 131: /* --delay */
967
ret = sscanf(arg, "%lf%n", &delay, &numchars);
968
if(ret < 1 or arg[numchars] != '\0'){
969
fprintf(stderr, "Bad delay\n");
970
exit(EXIT_FAILURE);
971
}
972
break;
973
case ARGP_KEY_ARG:
974
argp_usage(state);
975
case ARGP_KEY_END:
1819
errno = 0;
1820
delay = strtof(arg, &tmp);
1821
if(errno != 0 or tmp == arg or *tmp != '\0'){
1822
argp_error(state, "Bad delay");
1823
}
1824
case 132: /* --retry */
1825
errno = 0;
1826
retry_interval = strtod(arg, &tmp);
1827
if(errno != 0 or tmp == arg or *tmp != '\0'
1828
or (retry_interval * 1000) > INT_MAX
1829
or retry_interval < 0){
1830
argp_error(state, "Bad retry interval");
1831
}
1832
break;
1833
case 133: /* --network-hook-dir */
1834
hookdir = arg;
1835
break;
1836
/*
1837
* These reproduce what we would get without ARGP_NO_HELP
1838
*/
1839
case '?': /* --help */
1840
argp_state_help(state, state->out_stream,
1841
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1842
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1843
case -3: /* --usage */
1844
argp_state_help(state, state->out_stream,
1845
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1846
case 'V': /* --version */
1847
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1848
exit(argp_err_exit_status);
976
1849
break;
977
1850
default:
978
1851
return ARGP_ERR_UNKNOWN;
979
1852
}
980
return 0;
1853
return errno;
981
1854
}
982
1855
983
1856
struct argp argp = { .options = options, .parser = parse_opt,
984
1857
.args_doc = "",
985
1858
.doc = "Mandos client -- Get and decrypt"
986
1859
" passwords from a Mandos server" };
987
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
988
if(ret == ARGP_ERR_UNKNOWN){
989
fprintf(stderr, "Unknown error while parsing arguments\n");
990
exitcode = EXIT_FAILURE;
1860
ret = argp_parse(&argp, argc, argv,
1861
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1862
switch(ret){
1863
case 0:
1864
break;
1865
case ENOMEM:
1866
default:
1867
errno = ret;
1868
perror_plus("argp_parse");
1869
exitcode = EX_OSERR;
1870
goto end;
1871
case EINVAL:
1872
exitcode = EX_USAGE;
991
1873
goto end;
992
1874
}
993
1875
}
994
995
/* If the interface is down, bring it up */
996
if(interface[0] != '\0'){
997
#ifdef __linux__
998
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
999
messages to mess up the prompt */
1000
ret = klogctl(8, NULL, 5);
1001
bool restore_loglevel = true;
1002
if(ret == -1){
1003
restore_loglevel = false;
1004
perror("klogctl");
1005
}
1006
#endif
1007
1008
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1009
if(sd < 0){
1010
perror("socket");
1011
exitcode = EXIT_FAILURE;
1012
#ifdef __linux__
1013
if(restore_loglevel){
1014
ret = klogctl(7, NULL, 0);
1015
if(ret == -1){
1016
perror("klogctl");
1017
}
1018
}
1019
#endif
1020
goto end;
1021
}
1022
strcpy(network.ifr_name, interface);
1023
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1024
if(ret == -1){
1025
perror("ioctl SIOCGIFFLAGS");
1026
#ifdef __linux__
1027
if(restore_loglevel){
1028
ret = klogctl(7, NULL, 0);
1029
if(ret == -1){
1030
perror("klogctl");
1031
}
1032
}
1033
#endif
1034
exitcode = EXIT_FAILURE;
1035
goto end;
1036
}
1037
if((network.ifr_flags & IFF_UP) == 0){
1038
network.ifr_flags |= IFF_UP;
1039
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1876
1877
{
1878
/* Work around Debian bug #633582:
1879
<http://bugs.debian.org/633582> */
1880
1881
/* Re-raise priviliges */
1882
if(raise_privileges() == 0){
1883
struct stat st;
1884
1885
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1886
int seckey_fd = open(seckey, O_RDONLY);
1887
if(seckey_fd == -1){
1888
perror_plus("open");
1889
} else {
1890
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1891
if(ret == -1){
1892
perror_plus("fstat");
1893
} else {
1894
if(S_ISREG(st.st_mode)
1895
and st.st_uid == 0 and st.st_gid == 0){
1896
ret = fchown(seckey_fd, uid, gid);
1897
if(ret == -1){
1898
perror_plus("fchown");
1899
}
1900
}
1901
}
1902
TEMP_FAILURE_RETRY(close(seckey_fd));
1903
}
1904
}
1905
1906
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1907
int pubkey_fd = open(pubkey, O_RDONLY);
1908
if(pubkey_fd == -1){
1909
perror_plus("open");
1910
} else {
1911
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1912
if(ret == -1){
1913
perror_plus("fstat");
1914
} else {
1915
if(S_ISREG(st.st_mode)
1916
and st.st_uid == 0 and st.st_gid == 0){
1917
ret = fchown(pubkey_fd, uid, gid);
1918
if(ret == -1){
1919
perror_plus("fchown");
1920
}
1921
}
1922
}
1923
TEMP_FAILURE_RETRY(close(pubkey_fd));
1924
}
1925
}
1926
1927
/* Lower privileges */
1928
errno = 0;
1929
ret = seteuid(uid);
1040
1930
if(ret == -1){
1041
perror("ioctl SIOCSIFFLAGS");
1931
perror_plus("seteuid");
1932
}
1933
}
1934
}
1935
1936
/* Run network hooks */
1937
if(not run_network_hooks("start", interface, delay)){
1938
goto end;
1939
}
1940
1941
if(not debug){
1942
avahi_set_log_function(empty_log);
1943
}
1944
1945
if(interface[0] == '\0'){
1946
struct dirent **direntries;
1947
/* First look for interfaces that are up */
1948
ret = scandir(sys_class_net, &direntries, up_interface,
1949
alphasort);
1950
if(ret == 0){
1951
/* No up interfaces, look for any good interfaces */
1952
free(direntries);
1953
ret = scandir(sys_class_net, &direntries, good_interface,
1954
alphasort);
1955
}
1956
if(ret >= 1){
1957
/* Pick the first interface returned */
1958
interface = strdup(direntries[0]->d_name);
1959
if(debug){
1960
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1961
}
1962
if(interface == NULL){
1963
perror_plus("malloc");
1964
free(direntries);
1042
1965
exitcode = EXIT_FAILURE;
1043
#ifdef __linux__
1044
if(restore_loglevel){
1045
ret = klogctl(7, NULL, 0);
1046
if(ret == -1){
1047
perror("klogctl");
1048
}
1049
}
1050
#endif
1051
1966
goto end;
1052
1967
}
1053
}
1054
/* sleep checking until interface is running */
1055
for(int i=0; i < delay * 4; i++){
1056
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1057
if(ret == -1){
1058
perror("ioctl SIOCGIFFLAGS");
1059
} else if(network.ifr_flags & IFF_RUNNING){
1060
break;
1061
}
1062
struct timespec sleeptime = { .tv_nsec = 250000000 };
1063
ret = nanosleep(&sleeptime, NULL);
1064
if(ret == -1 and errno != EINTR){
1065
perror("nanosleep");
1066
}
1067
}
1068
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1069
if(ret == -1){
1070
perror("close");
1071
}
1072
#ifdef __linux__
1073
if(restore_loglevel){
1074
/* Restores kernel loglevel to default */
1075
ret = klogctl(7, NULL, 0);
1076
if(ret == -1){
1077
perror("klogctl");
1078
}
1079
}
1080
#endif
1081
}
1082
1083
uid = getuid();
1084
gid = getgid();
1085
1086
errno = 0;
1087
setgid(gid);
1088
if(ret == -1){
1089
perror("setgid");
1090
}
1091
1092
ret = setuid(uid);
1093
if(ret == -1){
1094
perror("setuid");
1095
}
1096
1097
ret = init_gnutls_global(&mc, pubkey, seckey);
1098
if(ret == -1){
1099
fprintf(stderr, "init_gnutls_global failed\n");
1100
exitcode = EXIT_FAILURE;
1968
free(direntries);
1969
} else {
1970
free(direntries);
1971
fprintf_plus(stderr, "Could not find a network interface\n");
1972
exitcode = EXIT_FAILURE;
1973
goto end;
1974
}
1975
}
1976
1977
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1978
from the signal handler */
1979
/* Initialize the pseudo-RNG for Avahi */
1980
srand((unsigned int) time(NULL));
1981
mc.simple_poll = avahi_simple_poll_new();
1982
if(mc.simple_poll == NULL){
1983
fprintf_plus(stderr,
1984
"Avahi: Failed to create simple poll object.\n");
1985
exitcode = EX_UNAVAILABLE;
1986
goto end;
1987
}
1988
1989
sigemptyset(&sigterm_action.sa_mask);
1990
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1991
if(ret == -1){
1992
perror_plus("sigaddset");
1993
exitcode = EX_OSERR;
1994
goto end;
1995
}
1996
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1997
if(ret == -1){
1998
perror_plus("sigaddset");
1999
exitcode = EX_OSERR;
2000
goto end;
2001
}
2002
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2003
if(ret == -1){
2004
perror_plus("sigaddset");
2005
exitcode = EX_OSERR;
2006
goto end;
2007
}
2008
/* Need to check if the handler is SIG_IGN before handling:
2009
| [[info:libc:Initial Signal Actions]] |
2010
| [[info:libc:Basic Signal Handling]] |
2011
*/
2012
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2013
if(ret == -1){
2014
perror_plus("sigaction");
2015
return EX_OSERR;
2016
}
2017
if(old_sigterm_action.sa_handler != SIG_IGN){
2018
ret = sigaction(SIGINT, &sigterm_action, NULL);
2019
if(ret == -1){
2020
perror_plus("sigaction");
2021
exitcode = EX_OSERR;
2022
goto end;
2023
}
2024
}
2025
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2026
if(ret == -1){
2027
perror_plus("sigaction");
2028
return EX_OSERR;
2029
}
2030
if(old_sigterm_action.sa_handler != SIG_IGN){
2031
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2032
if(ret == -1){
2033
perror_plus("sigaction");
2034
exitcode = EX_OSERR;
2035
goto end;
2036
}
2037
}
2038
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2039
if(ret == -1){
2040
perror_plus("sigaction");
2041
return EX_OSERR;
2042
}
2043
if(old_sigterm_action.sa_handler != SIG_IGN){
2044
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2045
if(ret == -1){
2046
perror_plus("sigaction");
2047
exitcode = EX_OSERR;
2048
goto end;
2049
}
2050
}
2051
2052
/* If the interface is down, bring it up */
2053
if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){
2054
ret = bring_up_interface(interface, delay);
2055
if(ret != 0){
2056
errno = ret;
2057
perror_plus("Failed to bring up interface");
2058
}
2059
}
2060
2061
if(quit_now){
2062
goto end;
2063
}
2064
2065
ret = init_gnutls_global(pubkey, seckey);
2066
if(ret == -1){
2067
fprintf_plus(stderr, "init_gnutls_global failed\n");
2068
exitcode = EX_UNAVAILABLE;
1101
2069
goto end;
1102
2070
} else {
1103
2071
gnutls_initialized = true;
1104
2072
}
1105
2073
2074
if(quit_now){
2075
goto end;
2076
}
2077
1106
2078
if(mkdtemp(tempdir) == NULL){
1107
perror("mkdtemp");
2079
perror_plus("mkdtemp");
1108
2080
goto end;
1109
2081
}
1110
2082
tempdir_created = true;
1111
2083
1112
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1113
fprintf(stderr, "init_gpgme failed\n");
1114
exitcode = EXIT_FAILURE;
2084
if(quit_now){
2085
goto end;
2086
}
2087
2088
if(not init_gpgme(pubkey, seckey, tempdir)){
2089
fprintf_plus(stderr, "init_gpgme failed\n");
2090
exitcode = EX_UNAVAILABLE;
1115
2091
goto end;
1116
2092
} else {
1117
2093
gpgme_initialized = true;
1118
2094
}
1119
2095
1120
if(interface[0] != '\0'){
1121
if_index = (AvahiIfIndex) if_nametoindex(interface);
1122
if(if_index == 0){
1123
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1124
exitcode = EXIT_FAILURE;
1125
goto end;
1126
}
2096
if(quit_now){
2097
goto end;
1127
2098
}
1128
2099
1129
2100
if(connect_to != NULL){
1130
2101
/* Connect directly, do not use Zeroconf */
1131
2102
/* (Mainly meant for debugging) */
1132
2103
char *address = strrchr(connect_to, ':');
2104
1133
2105
if(address == NULL){
1134
fprintf(stderr, "No colon in address\n");
1135
exitcode = EXIT_FAILURE;
1136
goto end;
1137
}
2106
fprintf_plus(stderr, "No colon in address\n");
2107
exitcode = EX_USAGE;
2108
goto end;
2109
}
2110
2111
if(quit_now){
2112
goto end;
2113
}
2114
1138
2115
uint16_t port;
1139
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1140
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1141
or address[numchars+1] != '\0'){
1142
fprintf(stderr, "Bad port number\n");
1143
exitcode = EXIT_FAILURE;
1144
goto end;
1145
}
2116
errno = 0;
2117
tmpmax = strtoimax(address+1, &tmp, 10);
2118
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2119
or tmpmax != (uint16_t)tmpmax){
2120
fprintf_plus(stderr, "Bad port number\n");
2121
exitcode = EX_USAGE;
2122
goto end;
2123
}
2124
2125
if(quit_now){
2126
goto end;
2127
}
2128
1146
2129
port = (uint16_t)tmpmax;
1147
2130
*address = '\0';
1148
address = connect_to;
1149
2131
/* Colon in address indicates IPv6 */
1150
2132
int af;
1151
if(strchr(address, ':') != NULL){
2133
if(strchr(connect_to, ':') != NULL){
1152
2134
af = AF_INET6;
2135
/* Accept [] around IPv6 address - see RFC 5952 */
2136
if(connect_to[0] == '[' and address[-1] == ']')
2137
{
2138
connect_to++;
2139
address[-1] = '\0';
2140
}
1153
2141
} else {
1154
2142
af = AF_INET;
1155
2143
}
1156
ret = start_mandos_communication(address, port, if_index, &mc,
1157
af);
1158
if(ret < 0){
1159
exitcode = EXIT_FAILURE;
1160
} else {
2144
address = connect_to;
2145
2146
if(quit_now){
2147
goto end;
2148
}
2149
2150
while(not quit_now){
2151
ret = start_mandos_communication(address, port, if_index, af);
2152
if(quit_now or ret == 0){
2153
break;
2154
}
2155
if(debug){
2156
fprintf_plus(stderr, "Retrying in %d seconds\n",
2157
(int)retry_interval);
2158
}
2159
sleep((int)retry_interval);
2160
}
2161
2162
if (not quit_now){
1161
2163
exitcode = EXIT_SUCCESS;
1162
2164
}
2165
1163
2166
goto end;
1164
2167
}
1165
2168
1166
if(not debug){
1167
avahi_set_log_function(empty_log);
1168
}
1169
1170
/* Initialize the pseudo-RNG for Avahi */
1171
srand((unsigned int) time(NULL));
1172
1173
/* Allocate main Avahi loop object */
1174
mc.simple_poll = avahi_simple_poll_new();
1175
if(mc.simple_poll == NULL){
1176
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1177
exitcode = EXIT_FAILURE;
2169
if(quit_now){
1178
2170
goto end;
1179
2171
}
1180
2172
1198
2190
1199
2191
/* Check if creating the Avahi server object succeeded */
1200
2192
if(mc.server == NULL){
1201
fprintf(stderr, "Failed to create Avahi server: %s\n",
1202
avahi_strerror(error));
1203
exitcode = EXIT_FAILURE;
2193
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2194
avahi_strerror(error));
2195
exitcode = EX_UNAVAILABLE;
2196
goto end;
2197
}
2198
2199
if(quit_now){
1204
2200
goto end;
1205
2201
}
1206
2202
1207
2203
/* Create the Avahi service browser */
1208
2204
sb = avahi_s_service_browser_new(mc.server, if_index,
1209
AVAHI_PROTO_INET6, "_mandos._tcp",
1210
NULL, 0, browse_callback, &mc);
2205
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2206
NULL, 0, browse_callback, NULL);
1211
2207
if(sb == NULL){
1212
fprintf(stderr, "Failed to create service browser: %s\n",
1213
avahi_strerror(avahi_server_errno(mc.server)));
1214
exitcode = EXIT_FAILURE;
2208
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2209
avahi_strerror(avahi_server_errno(mc.server)));
2210
exitcode = EX_UNAVAILABLE;
2211
goto end;
2212
}
2213
2214
if(quit_now){
1215
2215
goto end;
1216
2216
}
1217
2217
1218
2218
/* Run the main loop */
1219
2219
1220
2220
if(debug){
1221
fprintf(stderr, "Starting Avahi loop search\n");
1222
}
1223
1224
avahi_simple_poll_loop(mc.simple_poll);
2221
fprintf_plus(stderr, "Starting Avahi loop search\n");
2222
}
2223
2224
ret = avahi_loop_with_timeout(mc.simple_poll,
2225
(int)(retry_interval * 1000));
2226
if(debug){
2227
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2228
(ret == 0) ? "successfully" : "with error");
2229
}
1225
2230
1226
2231
end:
1227
2232
1228
2233
if(debug){
1229
fprintf(stderr, "%s exiting\n", argv[0]);
2234
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1230
2235
}
1231
2236
1232
2237
/* Cleanup things */
1249
2254
gpgme_release(mc.ctx);
1250
2255
}
1251
2256
1252
/* Removes the temp directory used by GPGME */
2257
/* Cleans up the circular linked list of Mandos servers the client
2258
has seen */
2259
if(mc.current_server != NULL){
2260
mc.current_server->prev->next = NULL;
2261
while(mc.current_server != NULL){
2262
server *next = mc.current_server->next;
2263
free(mc.current_server);
2264
mc.current_server = next;
2265
}
2266
}
2267
2268
/* Run network hooks */
2269
run_network_hooks("stop", interface, delay);
2270
2271
/* Re-raise priviliges */
2272
{
2273
raise_privileges();
2274
2275
/* Take down the network interface */
2276
if(take_down_interface and geteuid() == 0){
2277
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2278
if(ret == -1){
2279
perror_plus("ioctl SIOCGIFFLAGS");
2280
} else if(network.ifr_flags & IFF_UP){
2281
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2282
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2283
if(ret == -1){
2284
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2285
}
2286
}
2287
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2288
if(ret == -1){
2289
perror_plus("close");
2290
}
2291
}
2292
}
2293
/* Lower privileges permanently */
2294
errno = 0;
2295
ret = setuid(uid);
2296
if(ret == -1){
2297
perror_plus("setuid");
2298
}
2299
2300
/* Removes the GPGME temp directory and all files inside */
1253
2301
if(tempdir_created){
1254
DIR *d;
1255
struct dirent *direntry;
1256
d = opendir(tempdir);
1257
if(d == NULL){
1258
if(errno != ENOENT){
1259
perror("opendir");
1260
}
1261
} else {
1262
while(true){
1263
direntry = readdir(d);
1264
if(direntry == NULL){
1265
break;
1266
}
1267
/* Skip "." and ".." */
1268
if(direntry->d_name[0] == '.'
1269
and (direntry->d_name[1] == '\0'
1270
or (direntry->d_name[1] == '.'
1271
and direntry->d_name[2] == '\0'))){
1272
continue;
1273
}
2302
struct dirent **direntries = NULL;
2303
struct dirent *direntry = NULL;
2304
int numentries = scandir(tempdir, &direntries, notdotentries,
2305
alphasort);
2306
if (numentries > 0){
2307
for(int i = 0; i < numentries; i++){
2308
direntry = direntries[i];
1274
2309
char *fullname = NULL;
1275
2310
ret = asprintf(&fullname, "%s/%s", tempdir,
1276
2311
direntry->d_name);
1277
2312
if(ret < 0){
1278
perror("asprintf");
2313
perror_plus("asprintf");
1279
2314
continue;
1280
2315
}
1281
2316
ret = remove(fullname);
1282
2317
if(ret == -1){
1283
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1284
strerror(errno));
2318
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2319
strerror(errno));
1285
2320
}
1286
2321
free(fullname);
1287
2322
}
1288
closedir(d);
2323
}
2324
2325
/* need to clean even if 0 because man page doesn't specify */
2326
free(direntries);
2327
if (numentries == -1){
2328
perror_plus("scandir");
1289
2329
}
1290
2330
ret = rmdir(tempdir);
1291
2331
if(ret == -1 and errno != ENOENT){
1292
perror("rmdir");
1293
}
2332
perror_plus("rmdir");
2333
}
2334
}
2335
2336
if(quit_now){
2337
sigemptyset(&old_sigterm_action.sa_mask);
2338
old_sigterm_action.sa_handler = SIG_DFL;
2339
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2340
&old_sigterm_action,
2341
NULL));
2342
if(ret == -1){
2343
perror_plus("sigaction");
2344
}
2345
do {
2346
ret = raise(signal_received);
2347
} while(ret != 0 and errno == EINTR);
2348
if(ret != 0){
2349
perror_plus("raise");
2350
abort();
2351
}
2352
TEMP_FAILURE_RETRY(pause());
1294
2353
}
1295
2354
1296
2355
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0