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237.2.68
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-02-09 02:13:58 UTC
- mto: (24.1.136 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: teddy@fukt.bsnet.se-20090209021358-6nrlc91oi08hn5hb
* initramfs-tools-hook: Whitespace change only.
- files removed:
- 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 © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
39
stdout, ferror(), sscanf(),
40
remove() */
41
#include <stdint.h> /* uint16_t, uint32_t */
45
42
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
48
45
#include <stdbool.h> /* bool, false, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
53
50
sockaddr_in6, PF_INET6,
54
51
SOCK_STREAM, uid_t, gid_t, open(),
55
52
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
53
#include <sys/stat.h> /* open() */
57
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
55
inet_pton(), connect() */
59
56
#include <fcntl.h> /* open() */
60
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
58
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
60
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
68
63
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
64
SIOCSIFFLAGS, if_indextoname(),
70
65
if_nametoindex(), IF_NAMESIZE */
72
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
68
*/
74
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
78
73
#include <iso646.h> /* not, or, and */
79
74
#include <argp.h> /* struct argp_option, error_t, struct
80
75
argp_state, struct argp,
81
76
argp_parse(), ARGP_KEY_ARG,
82
77
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
92
78
#ifdef __linux__
93
79
#include <sys/klog.h> /* klogctl() */
94
#endif /* __linux__ */
80
#endif
95
81
96
82
/* Avahi */
97
83
/* All Avahi types, constants and functions
111
97
init_gnutls_session(),
112
98
GNUTLS_* */
113
99
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
100
/* gnutls_certificate_set_openpgp_key_file(),
101
GNUTLS_OPENPGP_FMT_BASE64 */
116
102
117
103
/* GPGME */
118
104
#include <gpgme.h> /* All GPGME types, constants and
126
112
#define PATHDIR "/conf/conf.d/mandos"
127
113
#define SECKEY "seckey.txt"
128
114
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
115
131
116
bool debug = false;
132
117
static const char mandos_protocol_version[] = "1";
133
118
const char *argp_program_version = "mandos-client " VERSION;
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
139
/* Doubly linked list that need to be circularly linked when used */
140
typedef struct server{
141
const char *ip;
142
uint16_t port;
143
AvahiIfIndex if_index;
144
int af;
145
struct timespec last_seen;
146
struct server *next;
147
struct server *prev;
148
} server;
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
149
120
150
121
/* Used for passing in values through the Avahi callback functions */
151
122
typedef struct {
156
127
gnutls_dh_params_t dh_params;
157
128
const char *priority;
158
129
gpgme_ctx_t ctx;
159
server *current_server;
160
130
} mandos_context;
161
131
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
167
168
sig_atomic_t quit_now = 0;
169
int signal_received = 0;
170
171
/* Function to use when printing errors */
172
void perror_plus(const char *print_text){
173
int e = errno;
174
fprintf(stderr, "Mandos plugin %s: ",
175
program_invocation_short_name);
176
errno = e;
177
perror(print_text);
178
}
179
180
__attribute__((format (gnu_printf, 2, 3)))
181
int fprintf_plus(FILE *stream, const char *format, ...){
182
va_list ap;
183
va_start (ap, format);
184
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
}
189
190
132
/*
191
* Make additional room in "buffer" for at least BUFFER_SIZE more
192
* bytes. "buffer_capacity" is how much is currently allocated,
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
193
135
* "buffer_length" is how much is already used.
194
136
*/
195
size_t incbuffer(char **buffer, size_t buffer_length,
196
size_t buffer_capacity){
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
138
size_t buffer_capacity){
197
139
if(buffer_length + BUFFER_SIZE > buffer_capacity){
198
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
141
if(buffer == NULL){
204
146
return buffer_capacity;
205
147
}
206
148
207
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
210
int ret;
211
server *new_server = malloc(sizeof(server));
212
if(new_server == NULL){
213
perror_plus("malloc");
214
return false;
215
}
216
*new_server = (server){ .ip = strdup(ip),
217
.port = port,
218
.if_index = if_index,
219
.af = af };
220
if(new_server->ip == NULL){
221
perror_plus("strdup");
222
return false;
223
}
224
/* Special case of first server */
225
if (mc.current_server == NULL){
226
new_server->next = new_server;
227
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
230
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
233
new_server->prev->next = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
240
}
241
return true;
242
}
243
244
149
/*
245
150
* Initialize GPGME.
246
151
*/
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
153
const char *pubkey, const char *tempdir){
154
int ret;
249
155
gpgme_error_t rc;
250
156
gpgme_engine_info_t engine_info;
251
157
254
160
* Helper function to insert pub and seckey to the engine keyring.
255
161
*/
256
162
bool import_key(const char *filename){
257
int ret;
258
163
int fd;
259
164
gpgme_data_t pgp_data;
260
165
261
166
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
262
167
if(fd == -1){
263
perror_plus("open");
168
perror("open");
264
169
return false;
265
170
}
266
171
267
172
rc = gpgme_data_new_from_fd(&pgp_data, fd);
268
173
if(rc != GPG_ERR_NO_ERROR){
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
271
176
return false;
272
177
}
273
178
274
rc = gpgme_op_import(mc.ctx, pgp_data);
179
rc = gpgme_op_import(mc->ctx, pgp_data);
275
180
if(rc != GPG_ERR_NO_ERROR){
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
gpgme_strsource(rc), gpgme_strerror(rc));
278
183
return false;
279
184
}
280
185
281
186
ret = (int)TEMP_FAILURE_RETRY(close(fd));
282
187
if(ret == -1){
283
perror_plus("close");
188
perror("close");
284
189
}
285
190
gpgme_data_release(pgp_data);
286
191
return true;
287
192
}
288
193
289
194
if(debug){
290
fprintf_plus(stderr, "Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
291
196
}
292
197
293
198
/* Init GPGME */
294
199
gpgme_check_version(NULL);
295
200
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
296
201
if(rc != GPG_ERR_NO_ERROR){
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
299
204
return false;
300
205
}
301
206
302
/* Set GPGME home directory for the OpenPGP engine only */
207
/* Set GPGME home directory for the OpenPGP engine only */
303
208
rc = gpgme_get_engine_info(&engine_info);
304
209
if(rc != GPG_ERR_NO_ERROR){
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
211
gpgme_strsource(rc), gpgme_strerror(rc));
307
212
return false;
308
213
}
309
214
while(engine_info != NULL){
315
220
engine_info = engine_info->next;
316
221
}
317
222
if(engine_info == NULL){
318
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
319
tempdir);
223
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
320
224
return false;
321
225
}
322
226
323
227
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
228
rc = gpgme_new(&(mc->ctx));
325
229
if(rc != GPG_ERR_NO_ERROR){
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
329
232
return false;
330
233
}
331
234
333
236
return false;
334
237
}
335
238
336
return true;
239
return true;
337
240
}
338
241
339
242
/*
340
243
* Decrypt OpenPGP data.
341
244
* Returns -1 on error
342
245
*/
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
344
248
size_t crypto_size,
345
249
char **plaintext){
346
250
gpgme_data_t dh_crypto, dh_plain;
350
254
ssize_t plaintext_length = 0;
351
255
352
256
if(debug){
353
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
257
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
354
258
}
355
259
356
260
/* Create new GPGME data buffer from memory cryptotext */
357
261
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
358
262
0);
359
263
if(rc != GPG_ERR_NO_ERROR){
360
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
264
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
362
266
return -1;
363
267
}
364
268
365
269
/* Create new empty GPGME data buffer for the plaintext */
366
270
rc = gpgme_data_new(&dh_plain);
367
271
if(rc != GPG_ERR_NO_ERROR){
368
fprintf_plus(stderr, "Mandos plugin mandos-client: "
369
"bad gpgme_data_new: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
272
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
371
274
gpgme_data_release(dh_crypto);
372
275
return -1;
373
276
}
374
277
375
278
/* Decrypt data from the cryptotext data buffer to the plaintext
376
279
data buffer */
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
378
281
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
381
284
plaintext_length = -1;
382
285
if(debug){
383
286
gpgme_decrypt_result_t result;
384
result = gpgme_op_decrypt_result(mc.ctx);
287
result = gpgme_op_decrypt_result(mc->ctx);
385
288
if(result == NULL){
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
387
290
} else {
388
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
389
result->unsupported_algorithm);
390
fprintf_plus(stderr, "Wrong key usage: %u\n",
391
result->wrong_key_usage);
291
fprintf(stderr, "Unsupported algorithm: %s\n",
292
result->unsupported_algorithm);
293
fprintf(stderr, "Wrong key usage: %u\n",
294
result->wrong_key_usage);
392
295
if(result->file_name != NULL){
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
296
fprintf(stderr, "File name: %s\n", result->file_name);
394
297
}
395
298
gpgme_recipient_t recipient;
396
299
recipient = result->recipients;
397
while(recipient != NULL){
398
fprintf_plus(stderr, "Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name
400
(recipient->pubkey_algo));
401
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
402
fprintf_plus(stderr, "Secret key available: %s\n",
403
recipient->status == GPG_ERR_NO_SECKEY
404
? "No" : "Yes");
405
recipient = recipient->next;
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
}
406
310
}
407
311
}
408
312
}
410
314
}
411
315
412
316
if(debug){
413
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
317
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
414
318
}
415
319
416
320
/* Seek back to the beginning of the GPGME plaintext data buffer */
417
321
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
418
perror_plus("gpgme_data_seek");
322
perror("gpgme_data_seek");
419
323
plaintext_length = -1;
420
324
goto decrypt_end;
421
325
}
422
326
423
327
*plaintext = NULL;
424
328
while(true){
425
plaintext_capacity = incbuffer(plaintext,
426
(size_t)plaintext_length,
427
plaintext_capacity);
329
plaintext_capacity = adjustbuffer(plaintext,
330
(size_t)plaintext_length,
331
plaintext_capacity);
428
332
if(plaintext_capacity == 0){
429
perror_plus("incbuffer");
430
plaintext_length = -1;
431
goto decrypt_end;
333
perror("adjustbuffer");
334
plaintext_length = -1;
335
goto decrypt_end;
432
336
}
433
337
434
338
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
439
343
break;
440
344
}
441
345
if(ret < 0){
442
perror_plus("gpgme_data_read");
346
perror("gpgme_data_read");
443
347
plaintext_length = -1;
444
348
goto decrypt_end;
445
349
}
447
351
}
448
352
449
353
if(debug){
450
fprintf_plus(stderr, "Decrypted password is: ");
354
fprintf(stderr, "Decrypted password is: ");
451
355
for(ssize_t i = 0; i < plaintext_length; i++){
452
356
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
453
357
}
475
379
/* GnuTLS log function callback */
476
380
static void debuggnutls(__attribute__((unused)) int level,
477
381
const char* string){
478
fprintf_plus(stderr, "GnuTLS: %s", string);
382
fprintf(stderr, "GnuTLS: %s", string);
479
383
}
480
384
481
static int init_gnutls_global(const char *pubkeyfilename,
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
482
387
const char *seckeyfilename){
483
388
int ret;
484
389
485
390
if(debug){
486
fprintf_plus(stderr, "Initializing GnuTLS\n");
391
fprintf(stderr, "Initializing GnuTLS\n");
487
392
}
488
393
489
394
ret = gnutls_global_init();
490
395
if(ret != GNUTLS_E_SUCCESS){
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
396
fprintf(stderr, "GnuTLS global_init: %s\n",
397
safer_gnutls_strerror(ret));
493
398
return -1;
494
399
}
495
400
502
407
}
503
408
504
409
/* OpenPGP credentials */
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
506
411
if(ret != GNUTLS_E_SUCCESS){
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
from
414
-Wunreachable-code
415
*/
416
safer_gnutls_strerror(ret));
509
417
gnutls_global_deinit();
510
418
return -1;
511
419
}
512
420
513
421
if(debug){
514
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
515
" secret key %s as GnuTLS credentials\n",
516
pubkeyfilename,
517
seckeyfilename);
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
424
seckeyfilename);
518
425
}
519
426
520
427
ret = gnutls_certificate_set_openpgp_key_file
521
(mc.cred, pubkeyfilename, seckeyfilename,
428
(mc->cred, pubkeyfilename, seckeyfilename,
522
429
GNUTLS_OPENPGP_FMT_BASE64);
523
430
if(ret != GNUTLS_E_SUCCESS){
524
fprintf_plus(stderr,
525
"Error[%d] while reading the OpenPGP key pair ('%s',"
526
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
527
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
528
safer_gnutls_strerror(ret));
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));
529
436
goto globalfail;
530
437
}
531
438
532
439
/* GnuTLS server initialization */
533
ret = gnutls_dh_params_init(&mc.dh_params);
440
ret = gnutls_dh_params_init(&mc->dh_params);
534
441
if(ret != GNUTLS_E_SUCCESS){
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
" initialization: %s\n",
537
safer_gnutls_strerror(ret));
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
" %s\n", safer_gnutls_strerror(ret));
538
444
goto globalfail;
539
445
}
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
541
447
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
safer_gnutls_strerror(ret));
544
450
goto globalfail;
545
451
}
546
452
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
548
454
549
455
return 0;
550
456
551
457
globalfail:
552
458
553
gnutls_certificate_free_credentials(mc.cred);
459
gnutls_certificate_free_credentials(mc->cred);
554
460
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
461
gnutls_dh_params_deinit(mc->dh_params);
556
462
return -1;
557
463
}
558
464
559
static int init_gnutls_session(gnutls_session_t *session){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
560
467
int ret;
561
468
/* GnuTLS session creation */
562
do {
563
ret = gnutls_init(session, GNUTLS_SERVER);
564
if(quit_now){
565
return -1;
566
}
567
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
469
ret = gnutls_init(session, GNUTLS_SERVER);
568
470
if(ret != GNUTLS_E_SUCCESS){
569
fprintf_plus(stderr,
570
"Error in GnuTLS session initialization: %s\n",
571
safer_gnutls_strerror(ret));
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
safer_gnutls_strerror(ret));
572
473
}
573
474
574
475
{
575
476
const char *err;
576
do {
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
578
if(quit_now){
579
gnutls_deinit(*session);
580
return -1;
581
}
582
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
583
478
if(ret != GNUTLS_E_SUCCESS){
584
fprintf_plus(stderr, "Syntax error at: %s\n", err);
585
fprintf_plus(stderr, "GnuTLS error: %s\n",
586
safer_gnutls_strerror(ret));
479
fprintf(stderr, "Syntax error at: %s\n", err);
480
fprintf(stderr, "GnuTLS error: %s\n",
481
safer_gnutls_strerror(ret));
587
482
gnutls_deinit(*session);
588
483
return -1;
589
484
}
590
485
}
591
486
592
do {
593
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
mc.cred);
595
if(quit_now){
596
gnutls_deinit(*session);
597
return -1;
598
}
599
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
600
489
if(ret != GNUTLS_E_SUCCESS){
601
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
602
safer_gnutls_strerror(ret));
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
safer_gnutls_strerror(ret));
603
492
gnutls_deinit(*session);
604
493
return -1;
605
494
}
606
495
607
496
/* ignore client certificate if any. */
608
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
609
499
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
611
501
612
502
return 0;
613
503
}
619
509
/* Called when a Mandos server is found */
620
510
static int start_mandos_communication(const char *ip, uint16_t port,
621
511
AvahiIfIndex if_index,
622
int af){
623
int ret, tcp_sd = -1;
512
mandos_context *mc, int af){
513
int ret, tcp_sd;
624
514
ssize_t sret;
625
515
union {
626
516
struct sockaddr_in in;
627
517
struct sockaddr_in6 in6;
628
518
} to;
629
519
char *buffer = NULL;
630
char *decrypted_buffer = NULL;
520
char *decrypted_buffer;
631
521
size_t buffer_length = 0;
632
522
size_t buffer_capacity = 0;
523
ssize_t decrypted_buffer_size;
633
524
size_t written;
634
int retval = -1;
525
int retval = 0;
635
526
gnutls_session_t session;
636
527
int pf; /* Protocol family */
637
528
638
errno = 0;
639
640
if(quit_now){
641
errno = EINTR;
642
return -1;
643
}
644
645
529
switch(af){
646
530
case AF_INET6:
647
531
pf = PF_INET6;
650
534
pf = PF_INET;
651
535
break;
652
536
default:
653
fprintf_plus(stderr, "Bad address family: %d\n", af);
654
errno = EINVAL;
537
fprintf(stderr, "Bad address family: %d\n", af);
655
538
return -1;
656
539
}
657
540
658
ret = init_gnutls_session(&session);
541
ret = init_gnutls_session(mc, &session);
659
542
if(ret != 0){
660
543
return -1;
661
544
}
662
545
663
546
if(debug){
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
547
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
548
"\n", ip, port);
666
549
}
667
550
668
551
tcp_sd = socket(pf, SOCK_STREAM, 0);
669
552
if(tcp_sd < 0){
670
int e = errno;
671
perror_plus("socket");
672
errno = e;
673
goto mandos_end;
674
}
675
676
if(quit_now){
677
errno = EINTR;
678
goto mandos_end;
553
perror("socket");
554
return -1;
679
555
}
680
556
681
557
memset(&to, 0, sizeof(to));
682
558
if(af == AF_INET6){
683
to.in6.sin6_family = (sa_family_t)af;
559
to.in6.sin6_family = (uint16_t)af;
684
560
ret = inet_pton(af, ip, &to.in6.sin6_addr);
685
561
} else { /* IPv4 */
686
562
to.in.sin_family = (sa_family_t)af;
687
563
ret = inet_pton(af, ip, &to.in.sin_addr);
688
564
}
689
565
if(ret < 0 ){
690
int e = errno;
691
perror_plus("inet_pton");
692
errno = e;
693
goto mandos_end;
566
perror("inet_pton");
567
return -1;
694
568
}
695
569
if(ret == 0){
696
int e = errno;
697
fprintf_plus(stderr, "Bad address: %s\n", ip);
698
errno = e;
699
goto mandos_end;
570
fprintf(stderr, "Bad address: %s\n", ip);
571
return -1;
700
572
}
701
573
if(af == AF_INET6){
702
574
to.in6.sin6_port = htons(port); /* Spurious warnings from
705
577
706
578
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
579
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
580
-Wunreachable-code*/
709
581
if(if_index == AVAHI_IF_UNSPEC){
710
fprintf_plus(stderr, "An IPv6 link-local address is"
711
" incomplete without a network interface\n");
712
errno = EINVAL;
713
goto mandos_end;
582
fprintf(stderr, "An IPv6 link-local address is incomplete"
583
" without a network interface\n");
584
return -1;
714
585
}
715
586
/* Set the network interface number as scope */
716
587
to.in6.sin6_scope_id = (uint32_t)if_index;
721
592
-Wunreachable-code */
722
593
}
723
594
724
if(quit_now){
725
errno = EINTR;
726
goto mandos_end;
727
}
728
729
595
if(debug){
730
596
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
731
597
char interface[IF_NAMESIZE];
732
598
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
perror_plus("if_indextoname");
599
perror("if_indextoname");
734
600
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
601
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
602
ip, interface, port);
737
603
}
738
604
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
605
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
606
port);
741
607
}
742
608
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
609
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
750
616
sizeof(addrstr));
751
617
}
752
618
if(pcret == NULL){
753
perror_plus("inet_ntop");
619
perror("inet_ntop");
754
620
} else {
755
621
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
622
fprintf(stderr, "Canonical address form: %s\n", addrstr);
757
623
}
758
624
}
759
625
}
760
626
761
if(quit_now){
762
errno = EINTR;
763
goto mandos_end;
764
}
765
766
627
if(af == AF_INET6){
767
628
ret = connect(tcp_sd, &to.in6, sizeof(to));
768
629
} else {
769
630
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
770
631
}
771
632
if(ret < 0){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
int e = errno;
774
perror_plus("connect");
775
errno = e;
776
}
777
goto mandos_end;
778
}
779
780
if(quit_now){
781
errno = EINTR;
782
goto mandos_end;
633
perror("connect");
634
return -1;
783
635
}
784
636
785
637
const char *out = mandos_protocol_version;
787
639
while(true){
788
640
size_t out_size = strlen(out);
789
641
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
790
out_size - written));
642
out_size - written));
791
643
if(ret == -1){
792
int e = errno;
793
perror_plus("write");
794
errno = e;
644
perror("write");
645
retval = -1;
795
646
goto mandos_end;
796
647
}
797
648
written += (size_t)ret;
805
656
break;
806
657
}
807
658
}
808
809
if(quit_now){
810
errno = EINTR;
811
goto mandos_end;
812
}
813
659
}
814
660
815
661
if(debug){
816
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
817
}
818
819
if(quit_now){
820
errno = EINTR;
821
goto mandos_end;
822
}
823
824
/* This casting via intptr_t is to eliminate warning about casting
825
an int to a pointer type. This is exactly how the GnuTLS Guile
826
function "set-session-transport-fd!" does it. */
827
gnutls_transport_set_ptr(session,
828
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
829
830
if(quit_now){
831
errno = EINTR;
832
goto mandos_end;
833
}
834
835
do {
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{
836
668
ret = gnutls_handshake(session);
837
if(quit_now){
838
errno = EINTR;
839
goto mandos_end;
840
}
841
669
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
842
670
843
671
if(ret != GNUTLS_E_SUCCESS){
844
672
if(debug){
845
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
673
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
846
674
gnutls_perror(ret);
847
675
}
848
errno = EPROTO;
676
retval = -1;
849
677
goto mandos_end;
850
678
}
851
679
852
680
/* Read OpenPGP packet that contains the wanted password */
853
681
854
682
if(debug){
855
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
856
" %s\n", ip);
683
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
684
ip);
857
685
}
858
686
859
687
while(true){
860
861
if(quit_now){
862
errno = EINTR;
863
goto mandos_end;
864
}
865
866
buffer_capacity = incbuffer(&buffer, buffer_length,
867
buffer_capacity);
688
buffer_capacity = adjustbuffer(&buffer, buffer_length,
689
buffer_capacity);
868
690
if(buffer_capacity == 0){
869
int e = errno;
870
perror_plus("incbuffer");
871
errno = e;
872
goto mandos_end;
873
}
874
875
if(quit_now){
876
errno = EINTR;
691
perror("adjustbuffer");
692
retval = -1;
877
693
goto mandos_end;
878
694
}
879
695
888
704
case GNUTLS_E_AGAIN:
889
705
break;
890
706
case GNUTLS_E_REHANDSHAKE:
891
do {
707
do{
892
708
ret = gnutls_handshake(session);
893
894
if(quit_now){
895
errno = EINTR;
896
goto mandos_end;
897
}
898
709
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
899
710
if(ret < 0){
900
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
901
"***\n");
711
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
902
712
gnutls_perror(ret);
903
errno = EPROTO;
713
retval = -1;
904
714
goto mandos_end;
905
715
}
906
716
break;
907
717
default:
908
fprintf_plus(stderr, "Unknown error while reading data from"
909
" encrypted session with Mandos server\n");
718
fprintf(stderr, "Unknown error while reading data from"
719
" encrypted session with Mandos server\n");
720
retval = -1;
910
721
gnutls_bye(session, GNUTLS_SHUT_RDWR);
911
errno = EIO;
912
722
goto mandos_end;
913
723
}
914
724
} else {
917
727
}
918
728
919
729
if(debug){
920
fprintf_plus(stderr, "Closing TLS session\n");
921
}
922
923
if(quit_now){
924
errno = EINTR;
925
goto mandos_end;
926
}
927
928
do {
929
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
930
if(quit_now){
931
errno = EINTR;
932
goto mandos_end;
933
}
934
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
730
fprintf(stderr, "Closing TLS session\n");
731
}
732
733
gnutls_bye(session, GNUTLS_SHUT_RDWR);
935
734
936
735
if(buffer_length > 0){
937
ssize_t decrypted_buffer_size;
938
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
736
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
737
buffer_length,
939
738
&decrypted_buffer);
940
739
if(decrypted_buffer_size >= 0){
941
942
740
written = 0;
943
741
while(written < (size_t) decrypted_buffer_size){
944
if(quit_now){
945
errno = EINTR;
946
goto mandos_end;
947
}
948
949
742
ret = (int)fwrite(decrypted_buffer + written, 1,
950
743
(size_t)decrypted_buffer_size - written,
951
744
stdout);
952
745
if(ret == 0 and ferror(stdout)){
953
int e = errno;
954
746
if(debug){
955
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
956
strerror(errno));
747
fprintf(stderr, "Error writing encrypted data: %s\n",
748
strerror(errno));
957
749
}
958
errno = e;
959
goto mandos_end;
750
retval = -1;
751
break;
960
752
}
961
753
written += (size_t)ret;
962
754
}
963
retval = 0;
755
free(decrypted_buffer);
756
} else {
757
retval = -1;
964
758
}
759
} else {
760
retval = -1;
965
761
}
966
762
967
763
/* Shutdown procedure */
968
764
969
765
mandos_end:
970
{
971
int e = errno;
972
free(decrypted_buffer);
973
free(buffer);
974
if(tcp_sd >= 0){
975
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
976
}
977
if(ret == -1){
978
if(e == 0){
979
e = errno;
980
}
981
perror_plus("close");
982
}
983
gnutls_deinit(session);
984
errno = e;
985
if(quit_now){
986
errno = EINTR;
987
retval = -1;
988
}
766
free(buffer);
767
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
768
if(ret == -1){
769
perror("close");
989
770
}
771
gnutls_deinit(session);
990
772
return retval;
991
773
}
992
774
1003
785
AVAHI_GCC_UNUSED AvahiStringList *txt,
1004
786
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1005
787
flags,
1006
AVAHI_GCC_UNUSED void* userdata){
788
void* userdata){
789
mandos_context *mc = userdata;
1007
790
assert(r);
1008
791
1009
792
/* Called whenever a service has been resolved successfully or
1010
793
timed out */
1011
794
1012
if(quit_now){
1013
return;
1014
}
1015
1016
795
switch(event){
1017
796
default:
1018
797
case AVAHI_RESOLVER_FAILURE:
1019
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1020
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1021
domain,
1022
avahi_strerror(avahi_server_errno(mc.server)));
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)));
1023
801
break;
1024
802
1025
803
case AVAHI_RESOLVER_FOUND:
1027
805
char ip[AVAHI_ADDRESS_STR_MAX];
1028
806
avahi_address_snprint(ip, sizeof(ip), address);
1029
807
if(debug){
1030
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1031
PRIdMAX ") on port %" PRIu16 "\n", name,
1032
host_name, ip, (intmax_t)interface, port);
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);
1033
811
}
1034
int ret = start_mandos_communication(ip, port, interface,
812
int ret = start_mandos_communication(ip, port, interface, mc,
1035
813
avahi_proto_to_af(proto));
1036
814
if(ret == 0){
1037
avahi_simple_poll_quit(mc.simple_poll);
1038
} else {
1039
if(not add_server(ip, port, interface,
1040
avahi_proto_to_af(proto))){
1041
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1042
" list\n", name);
1043
}
815
avahi_simple_poll_quit(mc->simple_poll);
1044
816
}
1045
817
}
1046
818
}
1056
828
const char *domain,
1057
829
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1058
830
flags,
1059
AVAHI_GCC_UNUSED void* userdata){
831
void* userdata){
832
mandos_context *mc = userdata;
1060
833
assert(b);
1061
834
1062
835
/* Called whenever a new services becomes available on the LAN or
1063
836
is removed from the LAN */
1064
837
1065
if(quit_now){
1066
return;
1067
}
1068
1069
838
switch(event){
1070
839
default:
1071
840
case AVAHI_BROWSER_FAILURE:
1072
841
1073
fprintf_plus(stderr, "(Avahi browser) %s\n",
1074
avahi_strerror(avahi_server_errno(mc.server)));
1075
avahi_simple_poll_quit(mc.simple_poll);
842
fprintf(stderr, "(Avahi browser) %s\n",
843
avahi_strerror(avahi_server_errno(mc->server)));
844
avahi_simple_poll_quit(mc->simple_poll);
1076
845
return;
1077
846
1078
847
case AVAHI_BROWSER_NEW:
1081
850
the callback function is called the Avahi server will free the
1082
851
resolver for us. */
1083
852
1084
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1085
name, type, domain, protocol, 0,
1086
resolve_callback, NULL) == NULL)
1087
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1088
" %s\n", name,
1089
avahi_strerror(avahi_server_errno(mc.server)));
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)));
1090
859
break;
1091
860
1092
861
case AVAHI_BROWSER_REMOVE:
1095
864
case AVAHI_BROWSER_ALL_FOR_NOW:
1096
865
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1097
866
if(debug){
1098
fprintf_plus(stderr, "No Mandos server found, still"
1099
" searching...\n");
867
fprintf(stderr, "No Mandos server found, still searching...\n");
1100
868
}
1101
869
break;
1102
870
}
1103
871
}
1104
872
1105
/* Signal handler that stops main loop after SIGTERM */
1106
static void handle_sigterm(int sig){
1107
if(quit_now){
1108
return;
1109
}
1110
quit_now = 1;
1111
signal_received = sig;
1112
int old_errno = errno;
1113
/* set main loop to exit */
1114
if(mc.simple_poll != NULL){
1115
avahi_simple_poll_quit(mc.simple_poll);
1116
}
1117
errno = old_errno;
1118
}
1119
1120
bool get_flags(const char *ifname, struct ifreq *ifr){
1121
int ret;
1122
1123
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1124
if(s < 0){
1125
perror_plus("socket");
1126
return false;
1127
}
1128
strcpy(ifr->ifr_name, ifname);
1129
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1130
if(ret == -1){
1131
if(debug){
1132
perror_plus("ioctl SIOCGIFFLAGS");
1133
}
1134
return false;
1135
}
1136
return true;
1137
}
1138
1139
bool good_flags(const char *ifname, const struct ifreq *ifr){
1140
1141
/* Reject the loopback device */
1142
if(ifr->ifr_flags & IFF_LOOPBACK){
1143
if(debug){
1144
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1145
ifname);
1146
}
1147
return false;
1148
}
1149
/* Accept point-to-point devices only if connect_to is specified */
1150
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1151
if(debug){
1152
fprintf_plus(stderr, "Accepting point-to-point interface"
1153
" \"%s\"\n", ifname);
1154
}
1155
return true;
1156
}
1157
/* Otherwise, reject non-broadcast-capable devices */
1158
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1159
if(debug){
1160
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1161
" \"%s\"\n", ifname);
1162
}
1163
return false;
1164
}
1165
/* Reject non-ARP interfaces (including dummy interfaces) */
1166
if(ifr->ifr_flags & IFF_NOARP){
1167
if(debug){
1168
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1169
ifname);
1170
}
1171
return false;
1172
}
1173
1174
/* Accept this device */
1175
if(debug){
1176
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1177
}
1178
return true;
1179
}
1180
1181
/*
1182
* This function determines if a directory entry in /sys/class/net
1183
* corresponds to an acceptable network device.
1184
* (This function is passed to scandir(3) as a filter function.)
1185
*/
1186
int good_interface(const struct dirent *if_entry){
1187
if(if_entry->d_name[0] == '.'){
1188
return 0;
1189
}
1190
1191
struct ifreq ifr;
1192
if(not get_flags(if_entry->d_name, &ifr)){
1193
if(debug){
1194
fprintf_plus(stderr, "Failed to get flags for interface "
1195
"\"%s\"\n", if_entry->d_name);
1196
}
1197
return 0;
1198
}
1199
1200
if(not good_flags(if_entry->d_name, &ifr)){
1201
return 0;
1202
}
1203
return 1;
1204
}
1205
1206
/*
1207
* This function determines if a directory entry in /sys/class/net
1208
* corresponds to an acceptable network device which is up.
1209
* (This function is passed to scandir(3) as a filter function.)
1210
*/
1211
int up_interface(const struct dirent *if_entry){
1212
if(if_entry->d_name[0] == '.'){
1213
return 0;
1214
}
1215
1216
struct ifreq ifr;
1217
if(not get_flags(if_entry->d_name, &ifr)){
1218
if(debug){
1219
fprintf_plus(stderr, "Failed to get flags for interface "
1220
"\"%s\"\n", if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject down interfaces */
1226
if(not (ifr.ifr_flags & IFF_UP)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
/* Reject non-running interfaces */
1235
if(not (ifr.ifr_flags & IFF_RUNNING)){
1236
if(debug){
1237
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
if(not good_flags(if_entry->d_name, &ifr)){
1244
return 0;
1245
}
1246
return 1;
1247
}
1248
1249
int notdotentries(const struct dirent *direntry){
1250
/* Skip "." and ".." */
1251
if(direntry->d_name[0] == '.'
1252
and (direntry->d_name[1] == '\0'
1253
or (direntry->d_name[1] == '.'
1254
and direntry->d_name[2] == '\0'))){
1255
return 0;
1256
}
1257
return 1;
1258
}
1259
1260
/* Is this directory entry a runnable program? */
1261
int runnable_hook(const struct dirent *direntry){
1262
int ret;
1263
size_t sret;
1264
struct stat st;
1265
1266
if((direntry->d_name)[0] == '\0'){
1267
/* Empty name? */
1268
return 0;
1269
}
1270
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1272
"abcdefghijklmnopqrstuvwxyz"
1273
"0123456789"
1274
"_-");
1275
if((direntry->d_name)[sret] != '\0'){
1276
/* Contains non-allowed characters */
1277
if(debug){
1278
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1279
direntry->d_name);
1280
}
1281
return 0;
1282
}
1283
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1292
if(ret == -1){
1293
if(debug){
1294
perror_plus("Could not stat hook");
1295
}
1296
return 0;
1297
}
1298
if(not (S_ISREG(st.st_mode))){
1299
/* Not a regular file */
1300
if(debug){
1301
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1302
direntry->d_name);
1303
}
1304
return 0;
1305
}
1306
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1307
/* Not executable */
1308
if(debug){
1309
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1310
direntry->d_name);
1311
}
1312
return 0;
1313
}
1314
if(debug){
1315
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1316
direntry->d_name);
1317
}
1318
return 1;
1319
}
1320
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1322
int ret;
1323
struct timespec now;
1324
struct timespec waited_time;
1325
intmax_t block_time;
1326
1327
while(true){
1328
if(mc.current_server == NULL){
1329
if (debug){
1330
fprintf_plus(stderr, "Wait until first server is found."
1331
" No timeout!\n");
1332
}
1333
ret = avahi_simple_poll_iterate(s, -1);
1334
} else {
1335
if (debug){
1336
fprintf_plus(stderr, "Check current_server if we should run"
1337
" it, or wait\n");
1338
}
1339
/* the current time */
1340
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1341
if(ret == -1){
1342
perror_plus("clock_gettime");
1343
return -1;
1344
}
1345
/* Calculating in ms how long time between now and server
1346
who we visted longest time ago. Now - last seen. */
1347
waited_time.tv_sec = (now.tv_sec
1348
- mc.current_server->last_seen.tv_sec);
1349
waited_time.tv_nsec = (now.tv_nsec
1350
- mc.current_server->last_seen.tv_nsec);
1351
/* total time is 10s/10,000ms.
1352
Converting to s from ms by dividing by 1,000,
1353
and ns to ms by dividing by 1,000,000. */
1354
block_time = ((retry_interval
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1357
1358
if (debug){
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1360
block_time);
1361
}
1362
1363
if(block_time <= 0){
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1368
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1370
return 0;
1371
}
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1373
&mc.current_server->last_seen);
1374
if(ret == -1){
1375
perror_plus("clock_gettime");
1376
return -1;
1377
}
1378
mc.current_server = mc.current_server->next;
1379
block_time = 0; /* Call avahi to find new Mandos
1380
servers, but don't block */
1381
}
1382
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1384
}
1385
if(ret != 0){
1386
if (ret > 0 or errno != EINTR){
1387
return (ret != 1) ? ret : 0;
1388
}
1389
}
1390
}
1391
}
1392
1393
bool run_network_hooks(const char *mode, const char *interface,
1394
const float delay){
1395
struct dirent **direntries;
1396
struct dirent *direntry;
1397
int ret;
1398
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1399
alphasort);
1400
if(numhooks == -1){
1401
perror_plus("scandir");
1402
} else {
1403
int devnull = open("/dev/null", O_RDONLY);
1404
for(int i = 0; i < numhooks; i++){
1405
direntry = direntries[i];
1406
char *fullname = NULL;
1407
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1408
if(ret < 0){
1409
perror_plus("asprintf");
1410
continue;
1411
}
1412
if(debug){
1413
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1414
direntry->d_name);
1415
}
1416
pid_t hook_pid = fork();
1417
if(hook_pid == 0){
1418
/* Child */
1419
/* Raise privileges */
1420
errno = 0;
1421
ret = seteuid(0);
1422
if(ret == -1){
1423
perror_plus("seteuid");
1424
}
1425
/* Raise privileges even more */
1426
errno = 0;
1427
ret = setuid(0);
1428
if(ret == -1){
1429
perror_plus("setuid");
1430
}
1431
/* Set group */
1432
errno = 0;
1433
ret = setgid(0);
1434
if(ret == -1){
1435
perror_plus("setgid");
1436
}
1437
/* Reset supplementary groups */
1438
errno = 0;
1439
ret = setgroups(0, NULL);
1440
if(ret == -1){
1441
perror_plus("setgroups");
1442
}
1443
dup2(devnull, STDIN_FILENO);
1444
close(devnull);
1445
dup2(STDERR_FILENO, STDOUT_FILENO);
1446
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1447
if(ret == -1){
1448
perror_plus("setenv");
1449
_exit(EX_OSERR);
1450
}
1451
ret = setenv("DEVICE", interface, 1);
1452
if(ret == -1){
1453
perror_plus("setenv");
1454
_exit(EX_OSERR);
1455
}
1456
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1457
if(ret == -1){
1458
perror_plus("setenv");
1459
_exit(EX_OSERR);
1460
}
1461
ret = setenv("MODE", mode, 1);
1462
if(ret == -1){
1463
perror_plus("setenv");
1464
_exit(EX_OSERR);
1465
}
1466
char *delaystring;
1467
ret = asprintf(&delaystring, "%f", delay);
1468
if(ret == -1){
1469
perror_plus("asprintf");
1470
_exit(EX_OSERR);
1471
}
1472
ret = setenv("DELAY", delaystring, 1);
1473
if(ret == -1){
1474
free(delaystring);
1475
perror_plus("setenv");
1476
_exit(EX_OSERR);
1477
}
1478
free(delaystring);
1479
if(connect_to != NULL){
1480
ret = setenv("CONNECT", connect_to, 1);
1481
if(ret == -1){
1482
perror_plus("setenv");
1483
_exit(EX_OSERR);
1484
}
1485
}
1486
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1487
perror_plus("execl");
1488
_exit(EXIT_FAILURE);
1489
}
1490
} else {
1491
int status;
1492
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1493
perror_plus("waitpid");
1494
free(fullname);
1495
continue;
1496
}
1497
if(WIFEXITED(status)){
1498
if(WEXITSTATUS(status) != 0){
1499
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1500
" with status %d\n", direntry->d_name,
1501
WEXITSTATUS(status));
1502
free(fullname);
1503
continue;
1504
}
1505
} else if(WIFSIGNALED(status)){
1506
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1507
" signal %d\n", direntry->d_name,
1508
WTERMSIG(status));
1509
free(fullname);
1510
continue;
1511
} else {
1512
fprintf_plus(stderr, "Warning: network hook \"%s\""
1513
" crashed\n", direntry->d_name);
1514
free(fullname);
1515
continue;
1516
}
1517
}
1518
free(fullname);
1519
if(debug){
1520
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1521
direntry->d_name);
1522
}
1523
}
1524
close(devnull);
1525
}
1526
return true;
1527
}
1528
1529
873
int main(int argc, char *argv[]){
1530
874
AvahiSServiceBrowser *sb = NULL;
1531
875
int error;
1532
876
int ret;
1533
877
intmax_t tmpmax;
1534
char *tmp;
878
int numchars;
1535
879
int exitcode = EXIT_SUCCESS;
1536
const char *interface = "";
880
const char *interface = "eth0";
1537
881
struct ifreq network;
1538
int sd = -1;
1539
bool take_down_interface = false;
882
int sd;
1540
883
uid_t uid;
1541
884
gid_t gid;
885
char *connect_to = NULL;
1542
886
char tempdir[] = "/tmp/mandosXXXXXX";
1543
887
bool tempdir_created = false;
1544
888
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1545
889
const char *seckey = PATHDIR "/" SECKEY;
1546
890
const char *pubkey = PATHDIR "/" PUBKEY;
1547
891
892
mandos_context mc = { .simple_poll = NULL, .server = NULL,
893
.dh_bits = 1024, .priority = "SECURE256"
894
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1548
895
bool gnutls_initialized = false;
1549
896
bool gpgme_initialized = false;
1550
float delay = 2.5f;
1551
double retry_interval = 10; /* 10s between trying a server and
1552
retrying the same server again */
1553
1554
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1555
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1556
1557
uid = getuid();
1558
gid = getgid();
1559
1560
/* Lower any group privileges we might have, just to be safe */
1561
errno = 0;
1562
ret = setgid(gid);
1563
if(ret == -1){
1564
perror_plus("setgid");
1565
}
1566
1567
/* Lower user privileges (temporarily) */
1568
errno = 0;
1569
ret = seteuid(uid);
1570
if(ret == -1){
1571
perror_plus("seteuid");
1572
}
1573
1574
if(quit_now){
1575
goto end;
1576
}
897
double delay = 2.5;
1577
898
1578
899
{
1579
900
struct argp_option options[] = {
1609
930
.arg = "SECONDS",
1610
931
.doc = "Maximum delay to wait for interface startup",
1611
932
.group = 2 },
1612
{ .name = "retry", .key = 132,
1613
.arg = "SECONDS",
1614
.doc = "Retry interval used when denied by the Mandos server",
1615
.group = 2 },
1616
{ .name = "network-hook-dir", .key = 133,
1617
.arg = "DIR",
1618
.doc = "Directory where network hooks are located",
1619
.group = 2 },
1620
/*
1621
* These reproduce what we would get without ARGP_NO_HELP
1622
*/
1623
{ .name = "help", .key = '?',
1624
.doc = "Give this help list", .group = -1 },
1625
{ .name = "usage", .key = -3,
1626
.doc = "Give a short usage message", .group = -1 },
1627
{ .name = "version", .key = 'V',
1628
.doc = "Print program version", .group = -1 },
1629
933
{ .name = NULL }
1630
934
};
1631
935
1632
936
error_t parse_opt(int key, char *arg,
1633
937
struct argp_state *state){
1634
errno = 0;
1635
938
switch(key){
1636
939
case 128: /* --debug */
1637
940
debug = true;
1649
952
pubkey = arg;
1650
953
break;
1651
954
case 129: /* --dh-bits */
1652
errno = 0;
1653
tmpmax = strtoimax(arg, &tmp, 10);
1654
if(errno != 0 or tmp == arg or *tmp != '\0'
1655
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1656
argp_error(state, "Bad number of 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);
1657
960
}
1658
961
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1659
962
break;
1661
964
mc.priority = arg;
1662
965
break;
1663
966
case 131: /* --delay */
1664
errno = 0;
1665
delay = strtof(arg, &tmp);
1666
if(errno != 0 or tmp == arg or *tmp != '\0'){
1667
argp_error(state, "Bad delay");
1668
}
1669
case 132: /* --retry */
1670
errno = 0;
1671
retry_interval = strtod(arg, &tmp);
1672
if(errno != 0 or tmp == arg or *tmp != '\0'
1673
or (retry_interval * 1000) > INT_MAX
1674
or retry_interval < 0){
1675
argp_error(state, "Bad retry interval");
1676
}
1677
break;
1678
case 133: /* --network-hook-dir */
1679
hookdir = arg;
1680
break;
1681
/*
1682
* These reproduce what we would get without ARGP_NO_HELP
1683
*/
1684
case '?': /* --help */
1685
argp_state_help(state, state->out_stream,
1686
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1687
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1688
case -3: /* --usage */
1689
argp_state_help(state, state->out_stream,
1690
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1691
case 'V': /* --version */
1692
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1693
exit(argp_err_exit_status);
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:
1694
976
break;
1695
977
default:
1696
978
return ARGP_ERR_UNKNOWN;
1697
979
}
1698
return errno;
980
return 0;
1699
981
}
1700
982
1701
983
struct argp argp = { .options = options, .parser = parse_opt,
1702
984
.args_doc = "",
1703
985
.doc = "Mandos client -- Get and decrypt"
1704
986
" passwords from a Mandos server" };
1705
ret = argp_parse(&argp, argc, argv,
1706
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1707
switch(ret){
1708
case 0:
1709
break;
1710
case ENOMEM:
1711
default:
1712
errno = ret;
1713
perror_plus("argp_parse");
1714
exitcode = EX_OSERR;
1715
goto end;
1716
case EINVAL:
1717
exitcode = EX_USAGE;
1718
goto end;
1719
}
1720
}
1721
1722
{
1723
/* Work around Debian bug #633582:
1724
<http://bugs.debian.org/633582> */
1725
1726
/* Re-raise priviliges */
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror_plus("seteuid");
1731
} else {
1732
struct stat st;
1733
1734
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1735
int seckey_fd = open(seckey, O_RDONLY);
1736
if(seckey_fd == -1){
1737
perror_plus("open");
1738
} else {
1739
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1740
if(ret == -1){
1741
perror_plus("fstat");
1742
} else {
1743
if(S_ISREG(st.st_mode)
1744
and st.st_uid == 0 and st.st_gid == 0){
1745
ret = fchown(seckey_fd, uid, gid);
1746
if(ret == -1){
1747
perror_plus("fchown");
1748
}
1749
}
1750
}
1751
TEMP_FAILURE_RETRY(close(seckey_fd));
1752
}
1753
}
1754
1755
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1756
int pubkey_fd = open(pubkey, O_RDONLY);
1757
if(pubkey_fd == -1){
1758
perror_plus("open");
1759
} else {
1760
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1761
if(ret == -1){
1762
perror_plus("fstat");
1763
} else {
1764
if(S_ISREG(st.st_mode)
1765
and st.st_uid == 0 and st.st_gid == 0){
1766
ret = fchown(pubkey_fd, uid, gid);
1767
if(ret == -1){
1768
perror_plus("fchown");
1769
}
1770
}
1771
}
1772
TEMP_FAILURE_RETRY(close(pubkey_fd));
1773
}
1774
}
1775
1776
/* Lower privileges */
1777
errno = 0;
1778
ret = seteuid(uid);
1779
if(ret == -1){
1780
perror_plus("seteuid");
1781
}
1782
}
1783
}
1784
1785
/* Run network hooks */
1786
if(not run_network_hooks("start", interface, delay)){
1787
goto end;
1788
}
1789
1790
if(not debug){
1791
avahi_set_log_function(empty_log);
1792
}
1793
1794
if(interface[0] == '\0'){
1795
struct dirent **direntries;
1796
/* First look for interfaces that are up */
1797
ret = scandir(sys_class_net, &direntries, up_interface,
1798
alphasort);
1799
if(ret == 0){
1800
/* No up interfaces, look for any good interfaces */
1801
free(direntries);
1802
ret = scandir(sys_class_net, &direntries, good_interface,
1803
alphasort);
1804
}
1805
if(ret >= 1){
1806
/* Pick the first interface returned */
1807
interface = strdup(direntries[0]->d_name);
1808
if(debug){
1809
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1810
}
1811
if(interface == NULL){
1812
perror_plus("malloc");
1813
free(direntries);
1814
exitcode = EXIT_FAILURE;
1815
goto end;
1816
}
1817
free(direntries);
1818
} else {
1819
free(direntries);
1820
fprintf_plus(stderr, "Could not find a network interface\n");
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");
1821
990
exitcode = EXIT_FAILURE;
1822
991
goto end;
1823
992
}
1824
993
}
1825
994
1826
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1827
from the signal handler */
1828
/* Initialize the pseudo-RNG for Avahi */
1829
srand((unsigned int) time(NULL));
1830
mc.simple_poll = avahi_simple_poll_new();
1831
if(mc.simple_poll == NULL){
1832
fprintf_plus(stderr,
1833
"Avahi: Failed to create simple poll object.\n");
1834
exitcode = EX_UNAVAILABLE;
1835
goto end;
1836
}
1837
1838
sigemptyset(&sigterm_action.sa_mask);
1839
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1840
if(ret == -1){
1841
perror_plus("sigaddset");
1842
exitcode = EX_OSERR;
1843
goto end;
1844
}
1845
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1846
if(ret == -1){
1847
perror_plus("sigaddset");
1848
exitcode = EX_OSERR;
1849
goto end;
1850
}
1851
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1852
if(ret == -1){
1853
perror_plus("sigaddset");
1854
exitcode = EX_OSERR;
1855
goto end;
1856
}
1857
/* Need to check if the handler is SIG_IGN before handling:
1858
| [[info:libc:Initial Signal Actions]] |
1859
| [[info:libc:Basic Signal Handling]] |
1860
*/
1861
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1862
if(ret == -1){
1863
perror_plus("sigaction");
1864
return EX_OSERR;
1865
}
1866
if(old_sigterm_action.sa_handler != SIG_IGN){
1867
ret = sigaction(SIGINT, &sigterm_action, NULL);
1868
if(ret == -1){
1869
perror_plus("sigaction");
1870
exitcode = EX_OSERR;
1871
goto end;
1872
}
1873
}
1874
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1875
if(ret == -1){
1876
perror_plus("sigaction");
1877
return EX_OSERR;
1878
}
1879
if(old_sigterm_action.sa_handler != SIG_IGN){
1880
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1881
if(ret == -1){
1882
perror_plus("sigaction");
1883
exitcode = EX_OSERR;
1884
goto end;
1885
}
1886
}
1887
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1888
if(ret == -1){
1889
perror_plus("sigaction");
1890
return EX_OSERR;
1891
}
1892
if(old_sigterm_action.sa_handler != SIG_IGN){
1893
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1894
if(ret == -1){
1895
perror_plus("sigaction");
1896
exitcode = EX_OSERR;
1897
goto end;
1898
}
1899
}
1900
1901
995
/* If the interface is down, bring it up */
1902
if(strcmp(interface, "none") != 0){
1903
if_index = (AvahiIfIndex) if_nametoindex(interface);
1904
if(if_index == 0){
1905
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1906
exitcode = EX_UNAVAILABLE;
1907
goto end;
1908
}
1909
1910
if(quit_now){
1911
goto end;
1912
}
1913
1914
/* Re-raise priviliges */
1915
errno = 0;
1916
ret = seteuid(0);
1917
if(ret == -1){
1918
perror_plus("seteuid");
1919
}
1920
996
if(interface[0] != '\0'){
1921
997
#ifdef __linux__
1922
998
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1923
messages about the network interface to mess up the prompt */
999
messages to mess up the prompt */
1924
1000
ret = klogctl(8, NULL, 5);
1925
1001
bool restore_loglevel = true;
1926
1002
if(ret == -1){
1927
1003
restore_loglevel = false;
1928
perror_plus("klogctl");
1004
perror("klogctl");
1929
1005
}
1930
#endif /* __linux__ */
1006
#endif
1931
1007
1932
1008
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
1009
if(sd < 0){
1934
perror_plus("socket");
1935
exitcode = EX_OSERR;
1010
perror("socket");
1011
exitcode = EXIT_FAILURE;
1936
1012
#ifdef __linux__
1937
1013
if(restore_loglevel){
1938
1014
ret = klogctl(7, NULL, 0);
1939
1015
if(ret == -1){
1940
perror_plus("klogctl");
1016
perror("klogctl");
1941
1017
}
1942
1018
}
1943
#endif /* __linux__ */
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1019
#endif
1950
1020
goto end;
1951
1021
}
1952
1022
strcpy(network.ifr_name, interface);
1953
1023
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1954
1024
if(ret == -1){
1955
perror_plus("ioctl SIOCGIFFLAGS");
1025
perror("ioctl SIOCGIFFLAGS");
1956
1026
#ifdef __linux__
1957
1027
if(restore_loglevel){
1958
1028
ret = klogctl(7, NULL, 0);
1959
1029
if(ret == -1){
1960
perror_plus("klogctl");
1030
perror("klogctl");
1961
1031
}
1962
1032
}
1963
#endif /* __linux__ */
1964
exitcode = EX_OSERR;
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1033
#endif
1034
exitcode = EXIT_FAILURE;
1971
1035
goto end;
1972
1036
}
1973
1037
if((network.ifr_flags & IFF_UP) == 0){
1974
1038
network.ifr_flags |= IFF_UP;
1975
take_down_interface = true;
1976
1039
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1977
1040
if(ret == -1){
1978
take_down_interface = false;
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1980
exitcode = EX_OSERR;
1041
perror("ioctl SIOCSIFFLAGS");
1042
exitcode = EXIT_FAILURE;
1981
1043
#ifdef __linux__
1982
1044
if(restore_loglevel){
1983
1045
ret = klogctl(7, NULL, 0);
1984
1046
if(ret == -1){
1985
perror_plus("klogctl");
1047
perror("klogctl");
1986
1048
}
1987
1049
}
1988
#endif /* __linux__ */
1989
/* Lower privileges */
1990
errno = 0;
1991
ret = seteuid(uid);
1992
if(ret == -1){
1993
perror_plus("seteuid");
1994
}
1050
#endif
1995
1051
goto end;
1996
1052
}
1997
1053
}
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
1054
/* sleep checking until interface is running */
2000
1055
for(int i=0; i < delay * 4; i++){
2001
1056
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2002
1057
if(ret == -1){
2003
perror_plus("ioctl SIOCGIFFLAGS");
1058
perror("ioctl SIOCGIFFLAGS");
2004
1059
} else if(network.ifr_flags & IFF_RUNNING){
2005
1060
break;
2006
1061
}
2007
1062
struct timespec sleeptime = { .tv_nsec = 250000000 };
2008
1063
ret = nanosleep(&sleeptime, NULL);
2009
1064
if(ret == -1 and errno != EINTR){
2010
perror_plus("nanosleep");
1065
perror("nanosleep");
2011
1066
}
2012
1067
}
2013
if(not take_down_interface){
2014
/* We won't need the socket anymore */
2015
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2016
if(ret == -1){
2017
perror_plus("close");
2018
}
1068
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1069
if(ret == -1){
1070
perror("close");
2019
1071
}
2020
1072
#ifdef __linux__
2021
1073
if(restore_loglevel){
2022
1074
/* Restores kernel loglevel to default */
2023
1075
ret = klogctl(7, NULL, 0);
2024
1076
if(ret == -1){
2025
perror_plus("klogctl");
1077
perror("klogctl");
2026
1078
}
2027
1079
}
2028
#endif /* __linux__ */
2029
/* Lower privileges */
2030
errno = 0;
2031
/* Lower privileges */
2032
ret = seteuid(uid);
2033
if(ret == -1){
2034
perror_plus("seteuid");
2035
}
2036
}
2037
2038
if(quit_now){
2039
goto end;
2040
}
2041
2042
ret = init_gnutls_global(pubkey, seckey);
2043
if(ret == -1){
2044
fprintf_plus(stderr, "init_gnutls_global failed\n");
2045
exitcode = EX_UNAVAILABLE;
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;
2046
1101
goto end;
2047
1102
} else {
2048
1103
gnutls_initialized = true;
2049
1104
}
2050
1105
2051
if(quit_now){
2052
goto end;
2053
}
2054
2055
1106
if(mkdtemp(tempdir) == NULL){
2056
perror_plus("mkdtemp");
1107
perror("mkdtemp");
2057
1108
goto end;
2058
1109
}
2059
1110
tempdir_created = true;
2060
1111
2061
if(quit_now){
2062
goto end;
2063
}
2064
2065
if(not init_gpgme(pubkey, seckey, tempdir)){
2066
fprintf_plus(stderr, "init_gpgme failed\n");
2067
exitcode = EX_UNAVAILABLE;
1112
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1113
fprintf(stderr, "init_gpgme failed\n");
1114
exitcode = EXIT_FAILURE;
2068
1115
goto end;
2069
1116
} else {
2070
1117
gpgme_initialized = true;
2071
1118
}
2072
1119
2073
if(quit_now){
2074
goto end;
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
}
2075
1127
}
2076
1128
2077
1129
if(connect_to != NULL){
2079
1131
/* (Mainly meant for debugging) */
2080
1132
char *address = strrchr(connect_to, ':');
2081
1133
if(address == NULL){
2082
fprintf_plus(stderr, "No colon in address\n");
2083
exitcode = EX_USAGE;
2084
goto end;
2085
}
2086
2087
if(quit_now){
2088
goto end;
2089
}
2090
1134
fprintf(stderr, "No colon in address\n");
1135
exitcode = EXIT_FAILURE;
1136
goto end;
1137
}
2091
1138
uint16_t port;
2092
errno = 0;
2093
tmpmax = strtoimax(address+1, &tmp, 10);
2094
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2095
or tmpmax != (uint16_t)tmpmax){
2096
fprintf_plus(stderr, "Bad port number\n");
2097
exitcode = EX_USAGE;
2098
goto end;
2099
}
2100
2101
if(quit_now){
2102
goto end;
2103
}
2104
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
}
2105
1146
port = (uint16_t)tmpmax;
2106
1147
*address = '\0';
1148
address = connect_to;
2107
1149
/* Colon in address indicates IPv6 */
2108
1150
int af;
2109
if(strchr(connect_to, ':') != NULL){
1151
if(strchr(address, ':') != NULL){
2110
1152
af = AF_INET6;
2111
/* Accept [] around IPv6 address - see RFC 5952 */
2112
if(connect_to[0] == '[' and address[-1] == ']')
2113
{
2114
connect_to++;
2115
address[-1] = '\0';
2116
}
2117
1153
} else {
2118
1154
af = AF_INET;
2119
1155
}
2120
address = connect_to;
2121
2122
if(quit_now){
2123
goto end;
2124
}
2125
2126
while(not quit_now){
2127
ret = start_mandos_communication(address, port, if_index, af);
2128
if(quit_now or ret == 0){
2129
break;
2130
}
2131
if(debug){
2132
fprintf_plus(stderr, "Retrying in %d seconds\n",
2133
(int)retry_interval);
2134
}
2135
sleep((int)retry_interval);
2136
}
2137
2138
if (not quit_now){
1156
ret = start_mandos_communication(address, port, if_index, &mc,
1157
af);
1158
if(ret < 0){
1159
exitcode = EXIT_FAILURE;
1160
} else {
2139
1161
exitcode = EXIT_SUCCESS;
2140
1162
}
2141
2142
1163
goto end;
2143
1164
}
2144
1165
2145
if(quit_now){
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;
2146
1178
goto end;
2147
1179
}
2148
1180
2166
1198
2167
1199
/* Check if creating the Avahi server object succeeded */
2168
1200
if(mc.server == NULL){
2169
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
2171
exitcode = EX_UNAVAILABLE;
2172
goto end;
2173
}
2174
2175
if(quit_now){
1201
fprintf(stderr, "Failed to create Avahi server: %s\n",
1202
avahi_strerror(error));
1203
exitcode = EXIT_FAILURE;
2176
1204
goto end;
2177
1205
}
2178
1206
2179
1207
/* Create the Avahi service browser */
2180
1208
sb = avahi_s_service_browser_new(mc.server, if_index,
2181
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2182
NULL, 0, browse_callback, NULL);
1209
AVAHI_PROTO_INET6, "_mandos._tcp",
1210
NULL, 0, browse_callback, &mc);
2183
1211
if(sb == NULL){
2184
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2185
avahi_strerror(avahi_server_errno(mc.server)));
2186
exitcode = EX_UNAVAILABLE;
2187
goto end;
2188
}
2189
2190
if(quit_now){
1212
fprintf(stderr, "Failed to create service browser: %s\n",
1213
avahi_strerror(avahi_server_errno(mc.server)));
1214
exitcode = EXIT_FAILURE;
2191
1215
goto end;
2192
1216
}
2193
1217
2194
1218
/* Run the main loop */
2195
1219
2196
1220
if(debug){
2197
fprintf_plus(stderr, "Starting Avahi loop search\n");
2198
}
2199
2200
ret = avahi_loop_with_timeout(mc.simple_poll,
2201
(int)(retry_interval * 1000));
2202
if(debug){
2203
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2204
(ret == 0) ? "successfully" : "with error");
2205
}
1221
fprintf(stderr, "Starting Avahi loop search\n");
1222
}
1223
1224
avahi_simple_poll_loop(mc.simple_poll);
2206
1225
2207
1226
end:
2208
1227
2209
1228
if(debug){
2210
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1229
fprintf(stderr, "%s exiting\n", argv[0]);
2211
1230
}
2212
1231
2213
1232
/* Cleanup things */
2230
1249
gpgme_release(mc.ctx);
2231
1250
}
2232
1251
2233
/* Cleans up the circular linked list of Mandos servers the client
2234
has seen */
2235
if(mc.current_server != NULL){
2236
mc.current_server->prev->next = NULL;
2237
while(mc.current_server != NULL){
2238
server *next = mc.current_server->next;
2239
free(mc.current_server);
2240
mc.current_server = next;
2241
}
2242
}
2243
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2246
2247
/* Re-raise priviliges */
2248
{
2249
errno = 0;
2250
ret = seteuid(0);
2251
if(ret == -1){
2252
perror_plus("seteuid");
2253
}
2254
2255
/* Take down the network interface */
2256
if(take_down_interface and geteuid() == 0){
2257
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2258
if(ret == -1){
2259
perror_plus("ioctl SIOCGIFFLAGS");
2260
} else if(network.ifr_flags & IFF_UP){
2261
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2262
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2263
if(ret == -1){
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2265
}
2266
}
2267
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
if(ret == -1){
2269
perror_plus("close");
2270
}
2271
}
2272
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
2279
2280
/* Removes the GPGME temp directory and all files inside */
1252
/* Removes the temp directory used by GPGME */
2281
1253
if(tempdir_created){
2282
struct dirent **direntries = NULL;
2283
struct dirent *direntry = NULL;
2284
int numentries = scandir(tempdir, &direntries, notdotentries,
2285
alphasort);
2286
if (numentries > 0){
2287
for(int i = 0; i < numentries; i++){
2288
direntry = direntries[i];
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
}
2289
1274
char *fullname = NULL;
2290
1275
ret = asprintf(&fullname, "%s/%s", tempdir,
2291
1276
direntry->d_name);
2292
1277
if(ret < 0){
2293
perror_plus("asprintf");
1278
perror("asprintf");
2294
1279
continue;
2295
1280
}
2296
1281
ret = remove(fullname);
2297
1282
if(ret == -1){
2298
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2299
strerror(errno));
1283
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1284
strerror(errno));
2300
1285
}
2301
1286
free(fullname);
2302
1287
}
2303
}
2304
2305
/* need to clean even if 0 because man page doesn't specify */
2306
free(direntries);
2307
if (numentries == -1){
2308
perror_plus("scandir");
1288
closedir(d);
2309
1289
}
2310
1290
ret = rmdir(tempdir);
2311
1291
if(ret == -1 and errno != ENOENT){
2312
perror_plus("rmdir");
2313
}
2314
}
2315
2316
if(quit_now){
2317
sigemptyset(&old_sigterm_action.sa_mask);
2318
old_sigterm_action.sa_handler = SIG_DFL;
2319
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2320
&old_sigterm_action,
2321
NULL));
2322
if(ret == -1){
2323
perror_plus("sigaction");
2324
}
2325
do {
2326
ret = raise(signal_received);
2327
} while(ret != 0 and errno == EINTR);
2328
if(ret != 0){
2329
perror_plus("raise");
2330
abort();
2331
}
2332
TEMP_FAILURE_RETRY(pause());
1292
perror("rmdir");
1293
}
2333
1294
}
2334
1295
2335
1296
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0