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- Committer: Björn Påhlsson
- Date: 2011-06-23 22:27:15 UTC
- mto: This revision was merged to the branch mainline in revision 485.
- Revision ID: belorn@fukt.bsnet.se-20110623222715-q5wro9ma9iyjl367
* Makefile (CFLAGS): Added "-lrt" to include real time library.
* plugins.d/mandos-client.c: use scandir(3) instead of readdir(3)
Prefix all debug output with "Mandos plugin " + program_invocation_short_name
Retry servers that failed to provide password.
New option --retry SECONDS that sets the interval between rechecking.
--retry also controls how often it retries a server when using --connect.
* plugins.d/splashy.c: Prefix all debug output with "Mandos plugin " + program_invocation_short_name
* plugins.d/usplash.c: --||--
* plugins.d/askpass-fifo.c: --||--
* plugins.d/password-prompt.c: --||--
* plugins.d/plymouth.c: --||--
* mandos: Lower logger level from warning to info on failed client requests because client was disabled or unknown fingerprint.
* plugins.d/plymouth.c (get_pid): bug fix. Was not calling free on direntries.
* plugins.d/mandos-client.c: use scandir(3) instead of readdir(3)
Prefix all debug output with "Mandos plugin " + program_invocation_short_name
Retry servers that failed to provide password.
New option --retry SECONDS that sets the interval between rechecking.
--retry also controls how often it retries a server when using --connect.
* plugins.d/splashy.c: Prefix all debug output with "Mandos plugin " + program_invocation_short_name
* plugins.d/usplash.c: --||--
* plugins.d/askpass-fifo.c: --||--
* plugins.d/password-prompt.c: --||--
* plugins.d/plymouth.c: --||--
* mandos: Lower logger level from warning to info on failed client requests because client was disabled or unknown fingerprint.
* plugins.d/plymouth.c (get_pid): bug fix. Was not calling free on direntries.
- files removed:
- debian/mandos-client.examples
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
58
inet_pton(), connect() */
59
59
#include <fcntl.h> /* open() */
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno, program_invocation_short_name */
66
66
#include <time.h> /* nanosleep(), time(), sleep() */
67
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
68
SIOCSIFFLAGS, if_indextoname(),
72
72
*/
73
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
74
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
77
#include <iso646.h> /* not, or, and */
78
78
#include <argp.h> /* struct argp_option, error_t, struct
79
79
argp_state, struct argp,
84
84
raise() */
85
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
94
87
95
88
#ifdef __linux__
96
89
#include <sys/klog.h> /* klogctl() */
114
107
init_gnutls_session(),
115
108
GNUTLS_* */
116
109
#include <gnutls/openpgp.h>
117
/* gnutls_certificate_set_openpgp_key_file(),
118
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
119
112
120
113
/* GPGME */
121
114
#include <gpgme.h> /* All GPGME types, constants and
129
122
#define PATHDIR "/conf/conf.d/mandos"
130
123
#define SECKEY "seckey.txt"
131
124
#define PUBKEY "pubkey.txt"
132
#define HOOKDIR "/lib/mandos/network-hooks.d"
133
125
134
126
bool debug = false;
135
127
static const char mandos_protocol_version[] = "1";
136
128
const char *argp_program_version = "mandos-client " VERSION;
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
138
130
static const char sys_class_net[] = "/sys/class/net";
139
131
char *connect_to = NULL;
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
143
132
144
/* Doubly linked list that need to be circularly linked when used */
133
/* Doubly linked list that need to be circular linked when ever used */
145
134
typedef struct server{
146
135
const char *ip;
147
in_port_t port;
136
uint16_t port;
148
137
AvahiIfIndex if_index;
149
138
int af;
150
139
struct timespec last_seen;
154
143
155
144
/* Used for passing in values through the Avahi callback functions */
156
145
typedef struct {
146
AvahiSimplePoll *simple_poll;
157
147
AvahiServer *server;
158
148
gnutls_certificate_credentials_t cred;
159
149
unsigned int dh_bits;
161
151
const char *priority;
162
152
gpgme_ctx_t ctx;
163
153
server *current_server;
164
char *interfaces;
165
size_t interfaces_size;
166
154
} mandos_context;
167
155
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
156
/* global context so signal handler can reach it*/
157
mandos_context mc = { .simple_poll = NULL, .server = NULL,
158
.dh_bits = 1024, .priority = "SECURE256"
159
":!CTYPE-X.509:+CTYPE-OPENPGP", .current_server = NULL };
170
160
171
161
sig_atomic_t quit_now = 0;
172
162
int signal_received = 0;
173
163
174
164
/* Function to use when printing errors */
175
165
void perror_plus(const char *print_text){
176
int e = errno;
177
fprintf(stderr, "Mandos plugin %s: ",
178
program_invocation_short_name);
179
errno = e;
166
fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);
180
167
perror(print_text);
181
168
}
182
169
183
__attribute__((format (gnu_printf, 2, 3)))
184
int fprintf_plus(FILE *stream, const char *format, ...){
185
va_list ap;
186
va_start (ap, format);
187
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
program_invocation_short_name));
190
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
191
}
192
193
170
/*
194
171
* Make additional room in "buffer" for at least BUFFER_SIZE more
195
172
* bytes. "buffer_capacity" is how much is currently allocated,
196
173
* "buffer_length" is how much is already used.
197
174
*/
198
175
size_t incbuffer(char **buffer, size_t buffer_length,
199
size_t buffer_capacity){
176
size_t buffer_capacity){
200
177
if(buffer_length + BUFFER_SIZE > buffer_capacity){
201
178
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
202
179
if(buffer == NULL){
207
184
return buffer_capacity;
208
185
}
209
186
210
/* Add server to set of servers to retry periodically */
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
187
int add_server(const char *ip, uint16_t port,
188
AvahiIfIndex if_index,
189
int af){
213
190
int ret;
214
191
server *new_server = malloc(sizeof(server));
215
192
if(new_server == NULL){
216
193
perror_plus("malloc");
217
return false;
194
return -1;
218
195
}
219
196
*new_server = (server){ .ip = strdup(ip),
220
.port = port,
221
.if_index = if_index,
222
.af = af };
197
.port = port,
198
.if_index = if_index,
199
.af = af };
223
200
if(new_server->ip == NULL){
224
201
perror_plus("strdup");
225
return false;
202
return -1;
226
203
}
227
/* Special case of first server */
228
if(*current_server == NULL){
204
/* uniqe case of first server */
205
if (mc.current_server == NULL){
229
206
new_server->next = new_server;
230
207
new_server->prev = new_server;
231
*current_server = new_server;
232
/* Place the new server last in the list */
208
mc.current_server = new_server;
209
/* Placing the new server last in the list */
233
210
} else {
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
211
new_server->next = mc.current_server;
212
new_server->prev = mc.current_server->prev;
236
213
new_server->prev->next = new_server;
237
(*current_server)->prev = new_server;
214
mc.current_server->prev = new_server;
238
215
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
216
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
240
217
if(ret == -1){
241
218
perror_plus("clock_gettime");
242
return false;
219
return -1;
243
220
}
244
return true;
221
return 0;
245
222
}
246
223
247
224
/*
248
225
* Initialize GPGME.
249
226
*/
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
227
static bool init_gpgme(const char *seckey,
228
const char *pubkey, const char *tempdir){
252
229
gpgme_error_t rc;
253
230
gpgme_engine_info_t engine_info;
254
231
232
255
233
/*
256
234
* Helper function to insert pub and seckey to the engine keyring.
257
235
*/
268
246
269
247
rc = gpgme_data_new_from_fd(&pgp_data, fd);
270
248
if(rc != GPG_ERR_NO_ERROR){
271
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
249
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
250
gpgme_strsource(rc), gpgme_strerror(rc));
273
251
return false;
274
252
}
275
253
276
rc = gpgme_op_import(mc->ctx, pgp_data);
254
rc = gpgme_op_import(mc.ctx, pgp_data);
277
255
if(rc != GPG_ERR_NO_ERROR){
278
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
256
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
257
gpgme_strsource(rc), gpgme_strerror(rc));
280
258
return false;
281
259
}
282
260
289
267
}
290
268
291
269
if(debug){
292
fprintf_plus(stderr, "Initializing GPGME\n");
270
fprintf(stderr, "Initializing GPGME\n");
293
271
}
294
272
295
273
/* Init GPGME */
296
274
gpgme_check_version(NULL);
297
275
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
298
276
if(rc != GPG_ERR_NO_ERROR){
299
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
300
gpgme_strsource(rc), gpgme_strerror(rc));
277
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
278
gpgme_strsource(rc), gpgme_strerror(rc));
301
279
return false;
302
280
}
303
281
304
/* Set GPGME home directory for the OpenPGP engine only */
282
/* Set GPGME home directory for the OpenPGP engine only */
305
283
rc = gpgme_get_engine_info(&engine_info);
306
284
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
285
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
309
287
return false;
310
288
}
311
289
while(engine_info != NULL){
317
295
engine_info = engine_info->next;
318
296
}
319
297
if(engine_info == NULL){
320
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
321
tempdir);
298
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
322
299
return false;
323
300
}
324
301
325
302
/* Create new GPGME "context" */
326
rc = gpgme_new(&(mc->ctx));
303
rc = gpgme_new(&(mc.ctx));
327
304
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
330
gpgme_strerror(rc));
305
fprintf(stderr, "bad gpgme_new: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
331
307
return false;
332
308
}
333
309
344
320
*/
345
321
static ssize_t pgp_packet_decrypt(const char *cryptotext,
346
322
size_t crypto_size,
347
char **plaintext,
348
mandos_context *mc){
323
char **plaintext){
349
324
gpgme_data_t dh_crypto, dh_plain;
350
325
gpgme_error_t rc;
351
326
ssize_t ret;
353
328
ssize_t plaintext_length = 0;
354
329
355
330
if(debug){
356
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
331
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
357
332
}
358
333
359
334
/* Create new GPGME data buffer from memory cryptotext */
360
335
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
361
336
0);
362
337
if(rc != GPG_ERR_NO_ERROR){
363
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
364
gpgme_strsource(rc), gpgme_strerror(rc));
338
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
339
gpgme_strsource(rc), gpgme_strerror(rc));
365
340
return -1;
366
341
}
367
342
368
343
/* Create new empty GPGME data buffer for the plaintext */
369
344
rc = gpgme_data_new(&dh_plain);
370
345
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "Mandos plugin mandos-client: "
372
"bad gpgme_data_new: %s: %s\n",
373
gpgme_strsource(rc), gpgme_strerror(rc));
346
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
347
gpgme_strsource(rc), gpgme_strerror(rc));
374
348
gpgme_data_release(dh_crypto);
375
349
return -1;
376
350
}
377
351
378
352
/* Decrypt data from the cryptotext data buffer to the plaintext
379
353
data buffer */
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
354
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
381
355
if(rc != GPG_ERR_NO_ERROR){
382
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
356
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
357
gpgme_strsource(rc), gpgme_strerror(rc));
384
358
plaintext_length = -1;
385
359
if(debug){
386
360
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc->ctx);
361
result = gpgme_op_decrypt_result(mc.ctx);
388
362
if(result == NULL){
389
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
363
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
390
364
} else {
391
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
392
result->unsupported_algorithm);
393
fprintf_plus(stderr, "Wrong key usage: %u\n",
394
result->wrong_key_usage);
365
fprintf(stderr, "Unsupported algorithm: %s\n",
366
result->unsupported_algorithm);
367
fprintf(stderr, "Wrong key usage: %u\n",
368
result->wrong_key_usage);
395
369
if(result->file_name != NULL){
396
fprintf_plus(stderr, "File name: %s\n", result->file_name);
370
fprintf(stderr, "File name: %s\n", result->file_name);
397
371
}
398
372
gpgme_recipient_t recipient;
399
373
recipient = result->recipients;
400
374
while(recipient != NULL){
401
fprintf_plus(stderr, "Public key algorithm: %s\n",
402
gpgme_pubkey_algo_name
403
(recipient->pubkey_algo));
404
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
405
fprintf_plus(stderr, "Secret key available: %s\n",
406
recipient->status == GPG_ERR_NO_SECKEY
407
? "No" : "Yes");
375
fprintf(stderr, "Public key algorithm: %s\n",
376
gpgme_pubkey_algo_name(recipient->pubkey_algo));
377
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
378
fprintf(stderr, "Secret key available: %s\n",
379
recipient->status == GPG_ERR_NO_SECKEY
380
? "No" : "Yes");
408
381
recipient = recipient->next;
409
382
}
410
383
}
413
386
}
414
387
415
388
if(debug){
416
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
389
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
417
390
}
418
391
419
392
/* Seek back to the beginning of the GPGME plaintext data buffer */
426
399
*plaintext = NULL;
427
400
while(true){
428
401
plaintext_capacity = incbuffer(plaintext,
429
(size_t)plaintext_length,
430
plaintext_capacity);
402
(size_t)plaintext_length,
403
plaintext_capacity);
431
404
if(plaintext_capacity == 0){
432
perror_plus("incbuffer");
433
plaintext_length = -1;
434
goto decrypt_end;
405
perror_plus("incbuffer");
406
plaintext_length = -1;
407
goto decrypt_end;
435
408
}
436
409
437
410
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
450
423
}
451
424
452
425
if(debug){
453
fprintf_plus(stderr, "Decrypted password is: ");
426
fprintf(stderr, "Decrypted password is: ");
454
427
for(ssize_t i = 0; i < plaintext_length; i++){
455
428
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
456
429
}
468
441
}
469
442
470
443
static const char * safer_gnutls_strerror(int value){
471
const char *ret = gnutls_strerror(value);
444
const char *ret = gnutls_strerror(value); /* Spurious warning from
445
-Wunreachable-code */
472
446
if(ret == NULL)
473
447
ret = "(unknown)";
474
448
return ret;
477
451
/* GnuTLS log function callback */
478
452
static void debuggnutls(__attribute__((unused)) int level,
479
453
const char* string){
480
fprintf_plus(stderr, "GnuTLS: %s", string);
454
fprintf(stderr, "GnuTLS: %s", string);
481
455
}
482
456
483
457
static int init_gnutls_global(const char *pubkeyfilename,
484
const char *seckeyfilename,
485
mandos_context *mc){
458
const char *seckeyfilename){
486
459
int ret;
487
460
488
461
if(debug){
489
fprintf_plus(stderr, "Initializing GnuTLS\n");
462
fprintf(stderr, "Initializing GnuTLS\n");
490
463
}
491
464
492
465
ret = gnutls_global_init();
493
466
if(ret != GNUTLS_E_SUCCESS){
494
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
495
safer_gnutls_strerror(ret));
467
fprintf(stderr, "GnuTLS global_init: %s\n",
468
safer_gnutls_strerror(ret));
496
469
return -1;
497
470
}
498
471
505
478
}
506
479
507
480
/* OpenPGP credentials */
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
481
gnutls_certificate_allocate_credentials(&mc.cred);
509
482
if(ret != GNUTLS_E_SUCCESS){
510
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
safer_gnutls_strerror(ret));
483
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
484
from
485
-Wunreachable-code
486
*/
487
safer_gnutls_strerror(ret));
512
488
gnutls_global_deinit();
513
489
return -1;
514
490
}
515
491
516
492
if(debug){
517
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
518
" secret key %s as GnuTLS credentials\n",
519
pubkeyfilename,
520
seckeyfilename);
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
495
seckeyfilename);
521
496
}
522
497
523
498
ret = gnutls_certificate_set_openpgp_key_file
524
(mc->cred, pubkeyfilename, seckeyfilename,
499
(mc.cred, pubkeyfilename, seckeyfilename,
525
500
GNUTLS_OPENPGP_FMT_BASE64);
526
501
if(ret != GNUTLS_E_SUCCESS){
527
fprintf_plus(stderr,
528
"Error[%d] while reading the OpenPGP key pair ('%s',"
529
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
530
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
531
safer_gnutls_strerror(ret));
502
fprintf(stderr,
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
505
fprintf(stderr, "The GnuTLS error is: %s\n",
506
safer_gnutls_strerror(ret));
532
507
goto globalfail;
533
508
}
534
509
535
510
/* GnuTLS server initialization */
536
ret = gnutls_dh_params_init(&mc->dh_params);
511
ret = gnutls_dh_params_init(&mc.dh_params);
537
512
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
" initialization: %s\n",
540
safer_gnutls_strerror(ret));
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
541
515
goto globalfail;
542
516
}
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
544
518
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
safer_gnutls_strerror(ret));
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
547
521
goto globalfail;
548
522
}
549
523
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
551
525
552
526
return 0;
553
527
554
528
globalfail:
555
529
556
gnutls_certificate_free_credentials(mc->cred);
530
gnutls_certificate_free_credentials(mc.cred);
557
531
gnutls_global_deinit();
558
gnutls_dh_params_deinit(mc->dh_params);
532
gnutls_dh_params_deinit(mc.dh_params);
559
533
return -1;
560
534
}
561
535
562
static int init_gnutls_session(gnutls_session_t *session,
563
mandos_context *mc){
536
static int init_gnutls_session(gnutls_session_t *session){
564
537
int ret;
565
538
/* GnuTLS session creation */
566
539
do {
570
543
}
571
544
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
572
545
if(ret != GNUTLS_E_SUCCESS){
573
fprintf_plus(stderr,
574
"Error in GnuTLS session initialization: %s\n",
575
safer_gnutls_strerror(ret));
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
safer_gnutls_strerror(ret));
576
548
}
577
549
578
550
{
579
551
const char *err;
580
552
do {
581
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
582
554
if(quit_now){
583
555
gnutls_deinit(*session);
584
556
return -1;
585
557
}
586
558
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
587
559
if(ret != GNUTLS_E_SUCCESS){
588
fprintf_plus(stderr, "Syntax error at: %s\n", err);
589
fprintf_plus(stderr, "GnuTLS error: %s\n",
590
safer_gnutls_strerror(ret));
560
fprintf(stderr, "Syntax error at: %s\n", err);
561
fprintf(stderr, "GnuTLS error: %s\n",
562
safer_gnutls_strerror(ret));
591
563
gnutls_deinit(*session);
592
564
return -1;
593
565
}
595
567
596
568
do {
597
569
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
598
mc->cred);
570
mc.cred);
599
571
if(quit_now){
600
572
gnutls_deinit(*session);
601
573
return -1;
602
574
}
603
575
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
604
576
if(ret != GNUTLS_E_SUCCESS){
605
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
606
safer_gnutls_strerror(ret));
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
safer_gnutls_strerror(ret));
607
579
gnutls_deinit(*session);
608
580
return -1;
609
581
}
611
583
/* ignore client certificate if any. */
612
584
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
613
585
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
615
587
616
588
return 0;
617
589
}
621
593
__attribute__((unused)) const char *txt){}
622
594
623
595
/* Called when a Mandos server is found */
624
static int start_mandos_communication(const char *ip, in_port_t port,
596
static int start_mandos_communication(const char *ip, uint16_t port,
625
597
AvahiIfIndex if_index,
626
int af, mandos_context *mc){
598
int af){
627
599
int ret, tcp_sd = -1;
628
600
ssize_t sret;
629
601
union {
654
626
pf = PF_INET;
655
627
break;
656
628
default:
657
fprintf_plus(stderr, "Bad address family: %d\n", af);
629
fprintf(stderr, "Bad address family: %d\n", af);
658
630
errno = EINVAL;
659
631
return -1;
660
632
}
661
633
662
/* If the interface is specified and we have a list of interfaces */
663
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
664
/* Check if the interface is one of the interfaces we are using */
665
bool match = false;
666
{
667
char *interface = NULL;
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
669
interface))){
670
if(if_nametoindex(interface) == (unsigned int)if_index){
671
match = true;
672
break;
673
}
674
}
675
}
676
if(not match){
677
/* This interface does not match any in the list, so we don't
678
connect to the server */
679
if(debug){
680
char interface[IF_NAMESIZE];
681
if(if_indextoname((unsigned int)if_index, interface) == NULL){
682
perror_plus("if_indextoname");
683
} else {
684
fprintf_plus(stderr, "Skipping server on non-used interface"
685
" \"%s\"\n",
686
if_indextoname((unsigned int)if_index,
687
interface));
688
}
689
}
690
return -1;
691
}
692
}
693
694
ret = init_gnutls_session(&session, mc);
634
ret = init_gnutls_session(&session);
695
635
if(ret != 0){
696
636
return -1;
697
637
}
698
638
699
639
if(debug){
700
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
701
PRIuMAX "\n", ip, (uintmax_t)port);
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
641
"\n", ip, port);
702
642
}
703
643
704
644
tcp_sd = socket(pf, SOCK_STREAM, 0);
730
670
}
731
671
if(ret == 0){
732
672
int e = errno;
733
fprintf_plus(stderr, "Bad address: %s\n", ip);
673
fprintf(stderr, "Bad address: %s\n", ip);
734
674
errno = e;
735
675
goto mandos_end;
736
676
}
737
677
if(af == AF_INET6){
738
to.in6.sin6_port = htons(port);
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
-Wconversion and
680
-Wunreachable-code */
681
739
682
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
740
683
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
741
-Wunreachable-code*/
684
-Wunreachable-code*/
742
685
if(if_index == AVAHI_IF_UNSPEC){
743
fprintf_plus(stderr, "An IPv6 link-local address is"
744
" incomplete without a network interface\n");
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
745
688
errno = EINVAL;
746
689
goto mandos_end;
747
690
}
765
708
if(if_indextoname((unsigned int)if_index, interface) == NULL){
766
709
perror_plus("if_indextoname");
767
710
} else {
768
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
769
"\n", ip, interface, (uintmax_t)port);
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
770
713
}
771
714
} else {
772
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
773
ip, (uintmax_t)port);
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
774
717
}
775
718
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
776
719
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
786
729
perror_plus("inet_ntop");
787
730
} else {
788
731
if(strcmp(addrstr, ip) != 0){
789
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
790
733
}
791
734
}
792
735
}
820
763
while(true){
821
764
size_t out_size = strlen(out);
822
765
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
823
out_size - written));
766
out_size - written));
824
767
if(ret == -1){
825
768
int e = errno;
826
769
perror_plus("write");
846
789
}
847
790
848
791
if(debug){
849
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
850
793
}
851
794
852
795
if(quit_now){
853
796
errno = EINTR;
854
797
goto mandos_end;
855
798
}
856
857
/* This casting via intptr_t is to eliminate warning about casting
858
an int to a pointer type. This is exactly how the GnuTLS Guile
859
function "set-session-transport-fd!" does it. */
860
gnutls_transport_set_ptr(session,
861
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
799
800
/* Spurious warnings from -Wint-to-pointer-cast */
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
862
802
863
803
if(quit_now){
864
804
errno = EINTR;
875
815
876
816
if(ret != GNUTLS_E_SUCCESS){
877
817
if(debug){
878
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
879
819
gnutls_perror(ret);
880
820
}
881
821
errno = EPROTO;
885
825
/* Read OpenPGP packet that contains the wanted password */
886
826
887
827
if(debug){
888
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
889
" %s\n", ip);
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
829
ip);
890
830
}
891
831
892
832
while(true){
897
837
}
898
838
899
839
buffer_capacity = incbuffer(&buffer, buffer_length,
900
buffer_capacity);
840
buffer_capacity);
901
841
if(buffer_capacity == 0){
902
842
int e = errno;
903
843
perror_plus("incbuffer");
930
870
}
931
871
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
932
872
if(ret < 0){
933
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
934
"***\n");
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
935
874
gnutls_perror(ret);
936
875
errno = EPROTO;
937
876
goto mandos_end;
938
877
}
939
878
break;
940
879
default:
941
fprintf_plus(stderr, "Unknown error while reading data from"
942
" encrypted session with Mandos server\n");
880
fprintf(stderr, "Unknown error while reading data from"
881
" encrypted session with Mandos server\n");
943
882
gnutls_bye(session, GNUTLS_SHUT_RDWR);
944
883
errno = EIO;
945
884
goto mandos_end;
950
889
}
951
890
952
891
if(debug){
953
fprintf_plus(stderr, "Closing TLS session\n");
892
fprintf(stderr, "Closing TLS session\n");
954
893
}
955
894
956
895
if(quit_now){
968
907
969
908
if(buffer_length > 0){
970
909
ssize_t decrypted_buffer_size;
971
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
972
&decrypted_buffer, mc);
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
911
buffer_length,
912
&decrypted_buffer);
973
913
if(decrypted_buffer_size >= 0){
974
914
975
915
written = 0;
985
925
if(ret == 0 and ferror(stdout)){
986
926
int e = errno;
987
927
if(debug){
988
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
989
strerror(errno));
928
fprintf(stderr, "Error writing encrypted data: %s\n",
929
strerror(errno));
990
930
}
991
931
errno = e;
992
932
goto mandos_end;
1036
976
AVAHI_GCC_UNUSED AvahiStringList *txt,
1037
977
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1038
978
flags,
1039
void* mc){
1040
if(r == NULL){
1041
return;
1042
}
979
AVAHI_GCC_UNUSED void* userdata){
980
assert(r);
1043
981
1044
982
/* Called whenever a service has been resolved successfully or
1045
983
timed out */
1051
989
switch(event){
1052
990
default:
1053
991
case AVAHI_RESOLVER_FAILURE:
1054
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1055
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1056
domain,
1057
avahi_strerror(avahi_server_errno
1058
(((mandos_context*)mc)->server)));
992
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
993
" of type '%s' in domain '%s': %s\n", name, type, domain,
994
avahi_strerror(avahi_server_errno(mc.server)));
1059
995
break;
1060
996
1061
997
case AVAHI_RESOLVER_FOUND:
1063
999
char ip[AVAHI_ADDRESS_STR_MAX];
1064
1000
avahi_address_snprint(ip, sizeof(ip), address);
1065
1001
if(debug){
1066
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1067
PRIdMAX ") on port %" PRIu16 "\n", name,
1068
host_name, ip, (intmax_t)interface, port);
1002
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
ip, (intmax_t)interface, port);
1069
1005
}
1070
int ret = start_mandos_communication(ip, (in_port_t)port,
1071
interface,
1072
avahi_proto_to_af(proto),
1073
mc);
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
1074
1008
if(ret == 0){
1075
avahi_simple_poll_quit(simple_poll);
1009
avahi_simple_poll_quit(mc.simple_poll);
1076
1010
} else {
1077
if(not add_server(ip, (in_port_t)port, interface,
1078
avahi_proto_to_af(proto),
1079
&((mandos_context*)mc)->current_server)){
1080
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1081
" list\n", name);
1082
}
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1083
1013
}
1084
1014
}
1085
1015
}
1095
1025
const char *domain,
1096
1026
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1097
1027
flags,
1098
void* mc){
1099
if(b == NULL){
1100
return;
1101
}
1028
AVAHI_GCC_UNUSED void* userdata){
1029
assert(b);
1102
1030
1103
1031
/* Called whenever a new services becomes available on the LAN or
1104
1032
is removed from the LAN */
1111
1039
default:
1112
1040
case AVAHI_BROWSER_FAILURE:
1113
1041
1114
fprintf_plus(stderr, "(Avahi browser) %s\n",
1115
avahi_strerror(avahi_server_errno
1116
(((mandos_context*)mc)->server)));
1117
avahi_simple_poll_quit(simple_poll);
1042
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
1118
1045
return;
1119
1046
1120
1047
case AVAHI_BROWSER_NEW:
1123
1050
the callback function is called the Avahi server will free the
1124
1051
resolver for us. */
1125
1052
1126
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1127
interface, protocol, name, type,
1128
domain, protocol, 0,
1129
resolve_callback, mc) == NULL)
1130
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1131
" %s\n", name,
1132
avahi_strerror(avahi_server_errno
1133
(((mandos_context*)mc)->server)));
1053
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
name, type, domain, protocol, 0,
1055
resolve_callback, NULL) == NULL)
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
1134
1058
break;
1135
1059
1136
1060
case AVAHI_BROWSER_REMOVE:
1139
1063
case AVAHI_BROWSER_ALL_FOR_NOW:
1140
1064
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1141
1065
if(debug){
1142
fprintf_plus(stderr, "No Mandos server found, still"
1143
" searching...\n");
1066
fprintf(stderr, "No Mandos server found, still searching...\n");
1144
1067
}
1145
1068
break;
1146
1069
}
1147
1070
}
1148
1071
1149
/* Signal handler that stops main loop after SIGTERM */
1072
/* Signal handler that stops main loop after sigterm has been called */
1150
1073
static void handle_sigterm(int sig){
1151
1074
if(quit_now){
1152
1075
return;
1155
1078
signal_received = sig;
1156
1079
int old_errno = errno;
1157
1080
/* set main loop to exit */
1158
if(simple_poll != NULL){
1159
avahi_simple_poll_quit(simple_poll);
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1160
1083
}
1161
1084
errno = old_errno;
1162
1085
}
1163
1086
1164
bool get_flags(const char *ifname, struct ifreq *ifr){
1165
int ret;
1166
error_t ret_errno;
1167
1168
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1169
if(s < 0){
1170
ret_errno = errno;
1171
perror_plus("socket");
1172
errno = ret_errno;
1173
return false;
1174
}
1175
strcpy(ifr->ifr_name, ifname);
1176
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1177
if(ret == -1){
1087
/*
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1091
*/
1092
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1096
return 0;
1097
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1178
1143
if(debug){
1179
ret_errno = errno;
1180
perror_plus("ioctl SIOCGIFFLAGS");
1181
errno = ret_errno;
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1182
1146
}
1183
return false;
1147
free(flagstring);
1148
return 0;
1184
1149
}
1185
return true;
1186
}
1187
1188
bool good_flags(const char *ifname, const struct ifreq *ifr){
1189
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1190
1152
/* Reject the loopback device */
1191
if(ifr->ifr_flags & IFF_LOOPBACK){
1153
if(flags & IFF_LOOPBACK){
1192
1154
if(debug){
1193
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1194
ifname);
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1195
1157
}
1196
return false;
1158
return 0;
1197
1159
}
1198
1160
/* Accept point-to-point devices only if connect_to is specified */
1199
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1200
1162
if(debug){
1201
fprintf_plus(stderr, "Accepting point-to-point interface"
1202
" \"%s\"\n", ifname);
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1203
1165
}
1204
return true;
1166
return 1;
1205
1167
}
1206
1168
/* Otherwise, reject non-broadcast-capable devices */
1207
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1169
if(not (flags & IFF_BROADCAST)){
1208
1170
if(debug){
1209
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1210
" \"%s\"\n", ifname);
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1211
1173
}
1212
return false;
1174
return 0;
1213
1175
}
1214
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1215
if(ifr->ifr_flags & IFF_NOARP){
1177
if(flags & IFF_NOARP){
1216
1178
if(debug){
1217
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1218
ifname);
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1219
1181
}
1220
return false;
1182
return 0;
1221
1183
}
1222
1223
1184
/* Accept this device */
1224
1185
if(debug){
1225
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1226
}
1227
return true;
1228
}
1229
1230
/*
1231
* This function determines if a directory entry in /sys/class/net
1232
* corresponds to an acceptable network device.
1233
* (This function is passed to scandir(3) as a filter function.)
1234
*/
1235
int good_interface(const struct dirent *if_entry){
1236
if(if_entry->d_name[0] == '.'){
1237
return 0;
1238
}
1239
1240
struct ifreq ifr;
1241
if(not get_flags(if_entry->d_name, &ifr)){
1242
if(debug){
1243
fprintf_plus(stderr, "Failed to get flags for interface "
1244
"\"%s\"\n", if_entry->d_name);
1245
}
1246
return 0;
1247
}
1248
1249
if(not good_flags(if_entry->d_name, &ifr)){
1250
return 0;
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1251
1188
}
1252
1189
return 1;
1253
1190
}
1254
1191
1255
/*
1256
* This function determines if a network interface is up.
1257
*/
1258
bool interface_is_up(const char *interface){
1259
struct ifreq ifr;
1260
if(not get_flags(interface, &ifr)){
1261
if(debug){
1262
fprintf_plus(stderr, "Failed to get flags for interface "
1263
"\"%s\"\n", interface);
1264
}
1265
return false;
1266
}
1267
1268
return (bool)(ifr.ifr_flags & IFF_UP);
1269
}
1270
1271
/*
1272
* This function determines if a network interface is running
1273
*/
1274
bool interface_is_running(const char *interface){
1275
struct ifreq ifr;
1276
if(not get_flags(interface, &ifr)){
1277
if(debug){
1278
fprintf_plus(stderr, "Failed to get flags for interface "
1279
"\"%s\"\n", interface);
1280
}
1281
return false;
1282
}
1283
1284
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1285
}
1286
1287
1192
int notdotentries(const struct dirent *direntry){
1288
1193
/* Skip "." and ".." */
1289
1194
if(direntry->d_name[0] == '.'
1295
1200
return 1;
1296
1201
}
1297
1202
1298
/* Is this directory entry a runnable program? */
1299
int runnable_hook(const struct dirent *direntry){
1300
int ret;
1301
size_t sret;
1302
struct stat st;
1303
1304
if((direntry->d_name)[0] == '\0'){
1305
/* Empty name? */
1306
return 0;
1307
}
1308
1309
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1310
"abcdefghijklmnopqrstuvwxyz"
1311
"0123456789"
1312
"_-");
1313
if((direntry->d_name)[sret] != '\0'){
1314
/* Contains non-allowed characters */
1315
if(debug){
1316
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1317
direntry->d_name);
1318
}
1319
return 0;
1320
}
1321
1322
char *fullname = NULL;
1323
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1324
if(ret < 0){
1325
perror_plus("asprintf");
1326
return 0;
1327
}
1328
1329
ret = stat(fullname, &st);
1330
if(ret == -1){
1331
if(debug){
1332
perror_plus("Could not stat hook");
1333
}
1334
return 0;
1335
}
1336
if(not (S_ISREG(st.st_mode))){
1337
/* Not a regular file */
1338
if(debug){
1339
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1340
direntry->d_name);
1341
}
1342
return 0;
1343
}
1344
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1345
/* Not executable */
1346
if(debug){
1347
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1348
direntry->d_name);
1349
}
1350
return 0;
1351
}
1352
if(debug){
1353
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1354
direntry->d_name);
1355
}
1356
return 1;
1357
}
1358
1359
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1360
mandos_context *mc){
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1361
1204
int ret;
1362
1205
struct timespec now;
1363
1206
struct timespec waited_time;
1364
1207
intmax_t block_time;
1365
1208
1366
1209
while(true){
1367
if(mc->current_server == NULL){
1210
if(mc.current_server == NULL){
1368
1211
if (debug){
1369
fprintf_plus(stderr, "Wait until first server is found."
1370
" No timeout!\n");
1212
fprintf(stderr, "Wait until first server is found. No timeout!\n");
1371
1213
}
1372
1214
ret = avahi_simple_poll_iterate(s, -1);
1373
1215
} else {
1374
1216
if (debug){
1375
fprintf_plus(stderr, "Check current_server if we should run"
1376
" it, or wait\n");
1217
fprintf(stderr, "Check current_server if we should run it, or wait\n");
1377
1218
}
1378
1219
/* the current time */
1379
1220
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1383
1224
}
1384
1225
/* Calculating in ms how long time between now and server
1385
1226
who we visted longest time ago. Now - last seen. */
1386
waited_time.tv_sec = (now.tv_sec
1387
- mc->current_server->last_seen.tv_sec);
1388
waited_time.tv_nsec = (now.tv_nsec
1389
- mc->current_server->last_seen.tv_nsec);
1390
/* total time is 10s/10,000ms.
1391
Converting to s from ms by dividing by 1,000,
1392
and ns to ms by dividing by 1,000,000. */
1393
block_time = ((retry_interval
1394
- ((intmax_t)waited_time.tv_sec * 1000))
1395
- ((intmax_t)waited_time.tv_nsec / 1000000));
1396
1227
waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;
1228
waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;
1229
/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */
1230
block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);
1231
1397
1232
if (debug){
1398
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1399
block_time);
1233
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1400
1234
}
1401
1235
1402
1236
if(block_time <= 0){
1403
ret = start_mandos_communication(mc->current_server->ip,
1404
mc->current_server->port,
1405
mc->current_server->if_index,
1406
mc->current_server->af, mc);
1237
ret = start_mandos_communication(mc.current_server->ip,
1238
mc.current_server->port,
1239
mc.current_server->if_index,
1240
mc.current_server->af);
1407
1241
if(ret == 0){
1408
avahi_simple_poll_quit(s);
1242
avahi_simple_poll_quit(mc.simple_poll);
1409
1243
return 0;
1410
1244
}
1411
ret = clock_gettime(CLOCK_MONOTONIC,
1412
&mc->current_server->last_seen);
1245
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
1413
1246
if(ret == -1){
1414
1247
perror_plus("clock_gettime");
1415
1248
return -1;
1416
1249
}
1417
mc->current_server = mc->current_server->next;
1418
block_time = 0; /* Call avahi to find new Mandos
1419
servers, but don't block */
1250
mc.current_server = mc.current_server->next;
1251
block_time = 0; /* call avahi to find new mandos servers, but dont block */
1420
1252
}
1421
1253
1422
1254
ret = avahi_simple_poll_iterate(s, (int)block_time);
1423
1255
}
1424
1256
if(ret != 0){
1425
if (ret > 0 or errno != EINTR){
1257
if (ret > 0 or errno != EINTR) {
1426
1258
return (ret != 1) ? ret : 0;
1427
1259
}
1428
1260
}
1429
1261
}
1430
1262
}
1431
1263
1432
/* Set effective uid to 0, return errno */
1433
error_t raise_privileges(void){
1434
error_t old_errno = errno;
1435
error_t ret_errno = 0;
1436
if(seteuid(0) == -1){
1437
ret_errno = errno;
1438
perror_plus("seteuid");
1439
}
1440
errno = old_errno;
1441
return ret_errno;
1442
}
1443
1444
/* Set effective and real user ID to 0. Return errno. */
1445
error_t raise_privileges_permanently(void){
1446
error_t old_errno = errno;
1447
error_t ret_errno = raise_privileges();
1448
if(ret_errno != 0){
1449
errno = old_errno;
1450
return ret_errno;
1451
}
1452
if(setuid(0) == -1){
1453
ret_errno = errno;
1454
perror_plus("seteuid");
1455
}
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
1460
/* Set effective user ID to unprivileged saved user ID */
1461
error_t lower_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(uid) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Lower privileges permanently */
1473
error_t lower_privileges_permanently(void){
1474
error_t old_errno = errno;
1475
error_t ret_errno = 0;
1476
if(setuid(uid) == -1){
1477
ret_errno = errno;
1478
perror_plus("setuid");
1479
}
1480
errno = old_errno;
1481
return ret_errno;
1482
}
1483
1484
bool run_network_hooks(const char *mode, const char *interface,
1485
const float delay){
1486
struct dirent **direntries;
1487
struct dirent *direntry;
1488
int ret;
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1490
alphasort);
1491
if(numhooks == -1){
1492
if(errno == ENOENT){
1493
if(debug){
1494
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1495
" found\n", hookdir);
1496
}
1497
} else {
1498
perror_plus("scandir");
1499
}
1500
} else {
1501
int devnull = open("/dev/null", O_RDONLY);
1502
for(int i = 0; i < numhooks; i++){
1503
direntry = direntries[i];
1504
char *fullname = NULL;
1505
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1506
if(ret < 0){
1507
perror_plus("asprintf");
1508
continue;
1509
}
1510
if(debug){
1511
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1512
direntry->d_name);
1513
}
1514
pid_t hook_pid = fork();
1515
if(hook_pid == 0){
1516
/* Child */
1517
/* Raise privileges */
1518
raise_privileges_permanently();
1519
/* Set group */
1520
errno = 0;
1521
ret = setgid(0);
1522
if(ret == -1){
1523
perror_plus("setgid");
1524
}
1525
/* Reset supplementary groups */
1526
errno = 0;
1527
ret = setgroups(0, NULL);
1528
if(ret == -1){
1529
perror_plus("setgroups");
1530
}
1531
dup2(devnull, STDIN_FILENO);
1532
close(devnull);
1533
dup2(STDERR_FILENO, STDOUT_FILENO);
1534
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1535
if(ret == -1){
1536
perror_plus("setenv");
1537
_exit(EX_OSERR);
1538
}
1539
ret = setenv("DEVICE", interface, 1);
1540
if(ret == -1){
1541
perror_plus("setenv");
1542
_exit(EX_OSERR);
1543
}
1544
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1545
if(ret == -1){
1546
perror_plus("setenv");
1547
_exit(EX_OSERR);
1548
}
1549
ret = setenv("MODE", mode, 1);
1550
if(ret == -1){
1551
perror_plus("setenv");
1552
_exit(EX_OSERR);
1553
}
1554
char *delaystring;
1555
ret = asprintf(&delaystring, "%f", delay);
1556
if(ret == -1){
1557
perror_plus("asprintf");
1558
_exit(EX_OSERR);
1559
}
1560
ret = setenv("DELAY", delaystring, 1);
1561
if(ret == -1){
1562
free(delaystring);
1563
perror_plus("setenv");
1564
_exit(EX_OSERR);
1565
}
1566
free(delaystring);
1567
if(connect_to != NULL){
1568
ret = setenv("CONNECT", connect_to, 1);
1569
if(ret == -1){
1570
perror_plus("setenv");
1571
_exit(EX_OSERR);
1572
}
1573
}
1574
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1575
perror_plus("execl");
1576
_exit(EXIT_FAILURE);
1577
}
1578
} else {
1579
int status;
1580
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1581
perror_plus("waitpid");
1582
free(fullname);
1583
continue;
1584
}
1585
if(WIFEXITED(status)){
1586
if(WEXITSTATUS(status) != 0){
1587
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1588
" with status %d\n", direntry->d_name,
1589
WEXITSTATUS(status));
1590
free(fullname);
1591
continue;
1592
}
1593
} else if(WIFSIGNALED(status)){
1594
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1595
" signal %d\n", direntry->d_name,
1596
WTERMSIG(status));
1597
free(fullname);
1598
continue;
1599
} else {
1600
fprintf_plus(stderr, "Warning: network hook \"%s\""
1601
" crashed\n", direntry->d_name);
1602
free(fullname);
1603
continue;
1604
}
1605
}
1606
free(fullname);
1607
if(debug){
1608
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1609
direntry->d_name);
1610
}
1611
}
1612
close(devnull);
1613
}
1614
return true;
1615
}
1616
1617
error_t bring_up_interface(const char *const interface,
1618
const float delay){
1619
int sd = -1;
1620
error_t old_errno = errno;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
1623
struct ifreq network;
1624
unsigned int if_index = if_nametoindex(interface);
1625
if(if_index == 0){
1626
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1627
errno = old_errno;
1628
return ENXIO;
1629
}
1630
1631
if(quit_now){
1632
errno = old_errno;
1633
return EINTR;
1634
}
1635
1636
if(not interface_is_up(interface)){
1637
if(not get_flags(interface, &network) and debug){
1638
ret_errno = errno;
1639
fprintf_plus(stderr, "Failed to get flags for interface "
1640
"\"%s\"\n", interface);
1641
return ret_errno;
1642
}
1643
network.ifr_flags |= IFF_UP;
1644
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1646
if(sd < 0){
1647
ret_errno = errno;
1648
perror_plus("socket");
1649
errno = old_errno;
1650
return ret_errno;
1651
}
1652
1653
if(quit_now){
1654
close(sd);
1655
errno = old_errno;
1656
return EINTR;
1657
}
1658
1659
if(debug){
1660
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1661
interface);
1662
}
1663
1664
/* Raise priviliges */
1665
raise_privileges();
1666
1667
#ifdef __linux__
1668
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1669
messages about the network interface to mess up the prompt */
1670
int ret_linux = klogctl(8, NULL, 5);
1671
bool restore_loglevel = true;
1672
if(ret_linux == -1){
1673
restore_loglevel = false;
1674
perror_plus("klogctl");
1675
}
1676
#endif /* __linux__ */
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1678
ret_errno = errno;
1679
#ifdef __linux__
1680
if(restore_loglevel){
1681
ret_linux = klogctl(7, NULL, 0);
1682
if(ret_linux == -1){
1683
perror_plus("klogctl");
1684
}
1685
}
1686
#endif /* __linux__ */
1687
1688
/* Lower privileges */
1689
lower_privileges();
1690
1691
/* Close the socket */
1692
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1693
if(ret == -1){
1694
perror_plus("close");
1695
}
1696
1697
if(ret_setflags == -1){
1698
errno = ret_errno;
1699
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1700
errno = old_errno;
1701
return ret_errno;
1702
}
1703
} else if(debug){
1704
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1705
interface);
1706
}
1707
1708
/* Sleep checking until interface is running.
1709
Check every 0.25s, up to total time of delay */
1710
for(int i=0; i < delay * 4; i++){
1711
if(interface_is_running(interface)){
1712
break;
1713
}
1714
struct timespec sleeptime = { .tv_nsec = 250000000 };
1715
ret = nanosleep(&sleeptime, NULL);
1716
if(ret == -1 and errno != EINTR){
1717
perror_plus("nanosleep");
1718
}
1719
}
1720
1721
errno = old_errno;
1722
return 0;
1723
}
1724
1725
error_t take_down_interface(const char *const interface){
1726
int sd = -1;
1727
error_t old_errno = errno;
1728
error_t ret_errno = 0;
1729
int ret, ret_setflags;
1730
struct ifreq network;
1731
unsigned int if_index = if_nametoindex(interface);
1732
if(if_index == 0){
1733
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1734
errno = old_errno;
1735
return ENXIO;
1736
}
1737
if(interface_is_up(interface)){
1738
if(not get_flags(interface, &network) and debug){
1739
ret_errno = errno;
1740
fprintf_plus(stderr, "Failed to get flags for interface "
1741
"\"%s\"\n", interface);
1742
return ret_errno;
1743
}
1744
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1745
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
if(sd < 0){
1748
ret_errno = errno;
1749
perror_plus("socket");
1750
errno = old_errno;
1751
return ret_errno;
1752
}
1753
1754
if(debug){
1755
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1756
interface);
1757
}
1758
1759
/* Raise priviliges */
1760
raise_privileges();
1761
1762
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1763
ret_errno = errno;
1764
1765
/* Lower privileges */
1766
lower_privileges();
1767
1768
/* Close the socket */
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1770
if(ret == -1){
1771
perror_plus("close");
1772
}
1773
1774
if(ret_setflags == -1){
1775
errno = ret_errno;
1776
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1777
errno = old_errno;
1778
return ret_errno;
1779
}
1780
} else if(debug){
1781
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1782
interface);
1783
}
1784
1785
errno = old_errno;
1786
return 0;
1787
}
1788
1789
1264
int main(int argc, char *argv[]){
1790
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1791
.priority = "SECURE256:!CTYPE-X.509:"
1792
"+CTYPE-OPENPGP", .current_server = NULL,
1793
.interfaces = NULL, .interfaces_size = 0 };
1794
1265
AvahiSServiceBrowser *sb = NULL;
1795
error_t ret_errno;
1266
int error;
1796
1267
int ret;
1797
1268
intmax_t tmpmax;
1798
1269
char *tmp;
1799
1270
int exitcode = EXIT_SUCCESS;
1800
char *interfaces_to_take_down = NULL;
1801
size_t interfaces_to_take_down_size = 0;
1271
const char *interface = "";
1272
struct ifreq network;
1273
int sd = -1;
1274
bool take_down_interface = false;
1275
uid_t uid;
1276
gid_t gid;
1802
1277
char tempdir[] = "/tmp/mandosXXXXXX";
1803
1278
bool tempdir_created = false;
1804
1279
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1805
1280
const char *seckey = PATHDIR "/" SECKEY;
1806
1281
const char *pubkey = PATHDIR "/" PUBKEY;
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1809
1282
1810
1283
bool gnutls_initialized = false;
1811
1284
bool gpgme_initialized = false;
1812
1285
float delay = 2.5f;
1813
double retry_interval = 10; /* 10s between trying a server and
1814
retrying the same server again */
1286
double retry_interval = 10; /* 10s between retrying a server and checking again*/
1815
1287
1816
1288
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1817
1289
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1873
1345
.group = 2 },
1874
1346
{ .name = "retry", .key = 132,
1875
1347
.arg = "SECONDS",
1876
.doc = "Retry interval used when denied by the Mandos server",
1877
.group = 2 },
1878
{ .name = "network-hook-dir", .key = 133,
1879
.arg = "DIR",
1880
.doc = "Directory where network hooks are located",
1348
.doc = "Retry interval used when denied by the mandos server",
1881
1349
.group = 2 },
1882
1350
/*
1883
1351
* These reproduce what we would get without ARGP_NO_HELP
1902
1370
connect_to = arg;
1903
1371
break;
1904
1372
case 'i': /* --interface */
1905
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1906
arg, (int)',');
1907
if(ret_errno != 0){
1908
argp_error(state, "%s", strerror(ret_errno));
1909
}
1373
interface = arg;
1910
1374
break;
1911
1375
case 's': /* --seckey */
1912
1376
seckey = arg;
1936
1400
errno = 0;
1937
1401
retry_interval = strtod(arg, &tmp);
1938
1402
if(errno != 0 or tmp == arg or *tmp != '\0'
1939
or (retry_interval * 1000) > INT_MAX
1940
or retry_interval < 0){
1403
or (retry_interval * 1000) > INT_MAX){
1941
1404
argp_error(state, "Bad retry interval");
1942
1405
}
1943
1406
break;
1944
case 133: /* --network-hook-dir */
1945
hookdir = arg;
1946
break;
1947
1407
/*
1948
1408
* These reproduce what we would get without ARGP_NO_HELP
1949
1409
*/
1955
1415
argp_state_help(state, state->out_stream,
1956
1416
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1957
1417
case 'V': /* --version */
1958
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1418
fprintf(state->out_stream, "%s\n", argp_program_version);
1959
1419
exit(argp_err_exit_status);
1960
1420
break;
1961
1421
default:
1984
1444
goto end;
1985
1445
}
1986
1446
}
1987
1988
{
1989
/* Work around Debian bug #633582:
1990
<http://bugs.debian.org/633582> */
1991
1992
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
1994
struct stat st;
1995
1996
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1997
int seckey_fd = open(seckey, O_RDONLY);
1998
if(seckey_fd == -1){
1999
perror_plus("open");
2000
} else {
2001
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2002
if(ret == -1){
2003
perror_plus("fstat");
2004
} else {
2005
if(S_ISREG(st.st_mode)
2006
and st.st_uid == 0 and st.st_gid == 0){
2007
ret = fchown(seckey_fd, uid, gid);
2008
if(ret == -1){
2009
perror_plus("fchown");
2010
}
2011
}
2012
}
2013
TEMP_FAILURE_RETRY(close(seckey_fd));
2014
}
2015
}
2016
2017
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2018
int pubkey_fd = open(pubkey, O_RDONLY);
2019
if(pubkey_fd == -1){
2020
perror_plus("open");
2021
} else {
2022
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2023
if(ret == -1){
2024
perror_plus("fstat");
2025
} else {
2026
if(S_ISREG(st.st_mode)
2027
and st.st_uid == 0 and st.st_gid == 0){
2028
ret = fchown(pubkey_fd, uid, gid);
2029
if(ret == -1){
2030
perror_plus("fchown");
2031
}
2032
}
2033
}
2034
TEMP_FAILURE_RETRY(close(pubkey_fd));
2035
}
2036
}
2037
2038
/* Lower privileges */
2039
lower_privileges();
2040
}
2041
}
2042
2043
/* Remove invalid interface names (except "none") */
2044
{
2045
char *interface = NULL;
2046
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2047
interface))){
2048
if(strcmp(interface, "none") != 0
2049
and if_nametoindex(interface) == 0){
2050
if(interface[0] != '\0'){
2051
fprintf_plus(stderr, "Not using nonexisting interface"
2052
" \"%s\"\n", interface);
2053
}
2054
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2055
interface = NULL;
2056
}
2057
}
2058
}
2059
2060
/* Run network hooks */
2061
{
2062
if(mc.interfaces != NULL){
2063
interfaces_hooks = malloc(mc.interfaces_size);
2064
if(interfaces_hooks == NULL){
2065
perror_plus("malloc");
2066
goto end;
2067
}
2068
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2069
interfaces_hooks_size = mc.interfaces_size;
2070
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2071
(int)',');
2072
}
2073
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2074
interfaces_hooks : "", delay)){
2075
goto end;
2076
}
2077
}
2078
1447
2079
1448
if(not debug){
2080
1449
avahi_set_log_function(empty_log);
2081
1450
}
1451
1452
if(interface[0] == '\0'){
1453
struct dirent **direntries;
1454
ret = scandir(sys_class_net, &direntries, good_interface,
1455
alphasort);
1456
if(ret >= 1){
1457
/* Pick the first good interface */
1458
interface = strdup(direntries[0]->d_name);
1459
if(debug){
1460
fprintf(stderr, "Using interface \"%s\"\n", interface);
1461
}
1462
if(interface == NULL){
1463
perror_plus("malloc");
1464
free(direntries);
1465
exitcode = EXIT_FAILURE;
1466
goto end;
1467
}
1468
free(direntries);
1469
} else {
1470
free(direntries);
1471
fprintf(stderr, "Could not find a network interface\n");
1472
exitcode = EXIT_FAILURE;
1473
goto end;
1474
}
1475
}
2082
1476
2083
1477
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2084
1478
from the signal handler */
2085
1479
/* Initialize the pseudo-RNG for Avahi */
2086
1480
srand((unsigned int) time(NULL));
2087
simple_poll = avahi_simple_poll_new();
2088
if(simple_poll == NULL){
2089
fprintf_plus(stderr,
2090
"Avahi: Failed to create simple poll object.\n");
1481
mc.simple_poll = avahi_simple_poll_new();
1482
if(mc.simple_poll == NULL){
1483
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2091
1484
exitcode = EX_UNAVAILABLE;
2092
1485
goto end;
2093
1486
}
2155
1548
}
2156
1549
}
2157
1550
2158
/* If no interfaces were specified, make a list */
2159
if(mc.interfaces == NULL){
2160
struct dirent **direntries;
2161
/* Look for any good interfaces */
2162
ret = scandir(sys_class_net, &direntries, good_interface,
2163
alphasort);
2164
if(ret >= 1){
2165
/* Add all found interfaces to interfaces list */
2166
for(int i = 0; i < ret; ++i){
2167
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2168
direntries[i]->d_name);
2169
if(ret_errno != 0){
2170
perror_plus("argz_add");
2171
continue;
2172
}
2173
if(debug){
2174
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2175
direntries[i]->d_name);
2176
}
2177
}
2178
free(direntries);
2179
} else {
2180
free(direntries);
2181
fprintf_plus(stderr, "Could not find a network interface\n");
2182
exitcode = EXIT_FAILURE;
2183
goto end;
2184
}
2185
}
2186
2187
/* Bring up interfaces which are down, and remove any "none"s */
2188
{
2189
char *interface = NULL;
2190
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2191
interface))){
2192
/* If interface name is "none", stop bringing up interfaces.
2193
Also remove all instances of "none" from the list */
2194
if(strcmp(interface, "none") == 0){
2195
argz_delete(&mc.interfaces, &mc.interfaces_size,
2196
interface);
2197
interface = NULL;
2198
while((interface = argz_next(mc.interfaces,
2199
mc.interfaces_size, interface))){
2200
if(strcmp(interface, "none") == 0){
2201
argz_delete(&mc.interfaces, &mc.interfaces_size,
2202
interface);
2203
interface = NULL;
1551
/* If the interface is down, bring it up */
1552
if(strcmp(interface, "none") != 0){
1553
if_index = (AvahiIfIndex) if_nametoindex(interface);
1554
if(if_index == 0){
1555
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1556
exitcode = EX_UNAVAILABLE;
1557
goto end;
1558
}
1559
1560
if(quit_now){
1561
goto end;
1562
}
1563
1564
/* Re-raise priviliges */
1565
errno = 0;
1566
ret = seteuid(0);
1567
if(ret == -1){
1568
perror_plus("seteuid");
1569
}
1570
1571
#ifdef __linux__
1572
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1573
messages about the network interface to mess up the prompt */
1574
ret = klogctl(8, NULL, 5);
1575
bool restore_loglevel = true;
1576
if(ret == -1){
1577
restore_loglevel = false;
1578
perror_plus("klogctl");
1579
}
1580
#endif /* __linux__ */
1581
1582
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1583
if(sd < 0){
1584
perror_plus("socket");
1585
exitcode = EX_OSERR;
1586
#ifdef __linux__
1587
if(restore_loglevel){
1588
ret = klogctl(7, NULL, 0);
1589
if(ret == -1){
1590
perror_plus("klogctl");
1591
}
1592
}
1593
#endif /* __linux__ */
1594
/* Lower privileges */
1595
errno = 0;
1596
ret = seteuid(uid);
1597
if(ret == -1){
1598
perror_plus("seteuid");
1599
}
1600
goto end;
1601
}
1602
strcpy(network.ifr_name, interface);
1603
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1604
if(ret == -1){
1605
perror_plus("ioctl SIOCGIFFLAGS");
1606
#ifdef __linux__
1607
if(restore_loglevel){
1608
ret = klogctl(7, NULL, 0);
1609
if(ret == -1){
1610
perror_plus("klogctl");
1611
}
1612
}
1613
#endif /* __linux__ */
1614
exitcode = EX_OSERR;
1615
/* Lower privileges */
1616
errno = 0;
1617
ret = seteuid(uid);
1618
if(ret == -1){
1619
perror_plus("seteuid");
1620
}
1621
goto end;
1622
}
1623
if((network.ifr_flags & IFF_UP) == 0){
1624
network.ifr_flags |= IFF_UP;
1625
take_down_interface = true;
1626
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1627
if(ret == -1){
1628
take_down_interface = false;
1629
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1630
exitcode = EX_OSERR;
1631
#ifdef __linux__
1632
if(restore_loglevel){
1633
ret = klogctl(7, NULL, 0);
1634
if(ret == -1){
1635
perror_plus("klogctl");
2204
1636
}
2205
1637
}
1638
#endif /* __linux__ */
1639
/* Lower privileges */
1640
errno = 0;
1641
ret = seteuid(uid);
1642
if(ret == -1){
1643
perror_plus("seteuid");
1644
}
1645
goto end;
1646
}
1647
}
1648
/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */
1649
for(int i=0; i < delay * 4; i++){
1650
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1651
if(ret == -1){
1652
perror_plus("ioctl SIOCGIFFLAGS");
1653
} else if(network.ifr_flags & IFF_RUNNING){
2206
1654
break;
2207
1655
}
2208
bool interface_was_up = interface_is_up(interface);
2209
ret = bring_up_interface(interface, delay);
2210
if(not interface_was_up){
2211
if(ret != 0){
2212
errno = ret;
2213
perror_plus("Failed to bring up interface");
2214
} else {
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2217
interface);
2218
}
2219
}
2220
}
2221
if(debug and (interfaces_to_take_down == NULL)){
2222
fprintf_plus(stderr, "No interfaces were brought up\n");
2223
}
2224
}
2225
2226
/* If we only got one interface, explicitly use only that one */
2227
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2228
if(debug){
2229
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2230
mc.interfaces);
2231
}
2232
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1656
struct timespec sleeptime = { .tv_nsec = 250000000 };
1657
ret = nanosleep(&sleeptime, NULL);
1658
if(ret == -1 and errno != EINTR){
1659
perror_plus("nanosleep");
1660
}
1661
}
1662
if(not take_down_interface){
1663
/* We won't need the socket anymore */
1664
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1665
if(ret == -1){
1666
perror_plus("close");
1667
}
1668
}
1669
#ifdef __linux__
1670
if(restore_loglevel){
1671
/* Restores kernel loglevel to default */
1672
ret = klogctl(7, NULL, 0);
1673
if(ret == -1){
1674
perror_plus("klogctl");
1675
}
1676
}
1677
#endif /* __linux__ */
1678
/* Lower privileges */
1679
errno = 0;
1680
if(take_down_interface){
1681
/* Lower privileges */
1682
ret = seteuid(uid);
1683
if(ret == -1){
1684
perror_plus("seteuid");
1685
}
1686
} else {
1687
/* Lower privileges permanently */
1688
ret = setuid(uid);
1689
if(ret == -1){
1690
perror_plus("setuid");
1691
}
1692
}
2233
1693
}
2234
1694
2235
1695
if(quit_now){
2236
1696
goto end;
2237
1697
}
2238
1698
2239
ret = init_gnutls_global(pubkey, seckey, &mc);
1699
ret = init_gnutls_global(pubkey, seckey);
2240
1700
if(ret == -1){
2241
fprintf_plus(stderr, "init_gnutls_global failed\n");
1701
fprintf(stderr, "init_gnutls_global failed\n");
2242
1702
exitcode = EX_UNAVAILABLE;
2243
1703
goto end;
2244
1704
} else {
2259
1719
goto end;
2260
1720
}
2261
1721
2262
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2263
fprintf_plus(stderr, "init_gpgme failed\n");
1722
if(not init_gpgme(pubkey, seckey, tempdir)){
1723
fprintf(stderr, "init_gpgme failed\n");
2264
1724
exitcode = EX_UNAVAILABLE;
2265
1725
goto end;
2266
1726
} else {
2275
1735
/* Connect directly, do not use Zeroconf */
2276
1736
/* (Mainly meant for debugging) */
2277
1737
char *address = strrchr(connect_to, ':');
2278
2279
1738
if(address == NULL){
2280
fprintf_plus(stderr, "No colon in address\n");
1739
fprintf(stderr, "No colon in address\n");
2281
1740
exitcode = EX_USAGE;
2282
1741
goto end;
2283
1742
}
2286
1745
goto end;
2287
1746
}
2288
1747
2289
in_port_t port;
1748
uint16_t port;
2290
1749
errno = 0;
2291
1750
tmpmax = strtoimax(address+1, &tmp, 10);
2292
1751
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2293
or tmpmax != (in_port_t)tmpmax){
2294
fprintf_plus(stderr, "Bad port number\n");
1752
or tmpmax != (uint16_t)tmpmax){
1753
fprintf(stderr, "Bad port number\n");
2295
1754
exitcode = EX_USAGE;
2296
1755
goto end;
2297
1756
}
2298
1757
2299
1758
if(quit_now){
2300
1759
goto end;
2301
1760
}
2302
1761
2303
port = (in_port_t)tmpmax;
1762
port = (uint16_t)tmpmax;
2304
1763
*address = '\0';
1764
address = connect_to;
2305
1765
/* Colon in address indicates IPv6 */
2306
1766
int af;
2307
if(strchr(connect_to, ':') != NULL){
1767
if(strchr(address, ':') != NULL){
2308
1768
af = AF_INET6;
2309
/* Accept [] around IPv6 address - see RFC 5952 */
2310
if(connect_to[0] == '[' and address[-1] == ']')
2311
{
2312
connect_to++;
2313
address[-1] = '\0';
2314
}
2315
1769
} else {
2316
1770
af = AF_INET;
2317
1771
}
2318
address = connect_to;
2319
1772
2320
1773
if(quit_now){
2321
1774
goto end;
2322
1775
}
2323
1776
2324
1777
while(not quit_now){
2325
ret = start_mandos_communication(address, port, if_index, af,
2326
&mc);
1778
ret = start_mandos_communication(address, port, if_index, af);
2327
1779
if(quit_now or ret == 0){
2328
1780
break;
2329
1781
}
2330
if(debug){
2331
fprintf_plus(stderr, "Retrying in %d seconds\n",
2332
(int)retry_interval);
2333
}
2334
sleep((unsigned int)retry_interval);
2335
}
2336
1782
sleep((int)retry_interval or 1);
1783
};
1784
2337
1785
if (not quit_now){
2338
1786
exitcode = EXIT_SUCCESS;
2339
1787
}
2340
1788
2341
1789
goto end;
2342
1790
}
2343
1791
2355
1803
config.publish_domain = 0;
2356
1804
2357
1805
/* Allocate a new server */
2358
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2359
&config, NULL, NULL, &ret_errno);
1806
mc.server = avahi_server_new(avahi_simple_poll_get
1807
(mc.simple_poll), &config, NULL,
1808
NULL, &error);
2360
1809
2361
1810
/* Free the Avahi configuration data */
2362
1811
avahi_server_config_free(&config);
2364
1813
2365
1814
/* Check if creating the Avahi server object succeeded */
2366
1815
if(mc.server == NULL){
2367
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2368
avahi_strerror(ret_errno));
1816
fprintf(stderr, "Failed to create Avahi server: %s\n",
1817
avahi_strerror(error));
2369
1818
exitcode = EX_UNAVAILABLE;
2370
1819
goto end;
2371
1820
}
2377
1826
/* Create the Avahi service browser */
2378
1827
sb = avahi_s_service_browser_new(mc.server, if_index,
2379
1828
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2380
NULL, 0, browse_callback,
2381
(void *)&mc);
1829
NULL, 0, browse_callback, NULL);
2382
1830
if(sb == NULL){
2383
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2384
avahi_strerror(avahi_server_errno(mc.server)));
1831
fprintf(stderr, "Failed to create service browser: %s\n",
1832
avahi_strerror(avahi_server_errno(mc.server)));
2385
1833
exitcode = EX_UNAVAILABLE;
2386
1834
goto end;
2387
1835
}
2393
1841
/* Run the main loop */
2394
1842
2395
1843
if(debug){
2396
fprintf_plus(stderr, "Starting Avahi loop search\n");
1844
fprintf(stderr, "Starting Avahi loop search\n");
2397
1845
}
2398
1846
2399
ret = avahi_loop_with_timeout(simple_poll,
2400
(int)(retry_interval * 1000), &mc);
1847
ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));
2401
1848
if(debug){
2402
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2403
(ret == 0) ? "successfully" : "with error");
1849
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1850
(ret == 0) ? "successfully" : "with error");
2404
1851
}
2405
1852
2406
1853
end:
2407
1854
2408
1855
if(debug){
2409
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1856
fprintf(stderr, "%s exiting\n", argv[0]);
2410
1857
}
2411
1858
2412
1859
/* Cleanup things */
2413
free(mc.interfaces);
2414
2415
1860
if(sb != NULL)
2416
1861
avahi_s_service_browser_free(sb);
2417
1862
2418
1863
if(mc.server != NULL)
2419
1864
avahi_server_free(mc.server);
2420
1865
2421
if(simple_poll != NULL)
2422
avahi_simple_poll_free(simple_poll);
1866
if(mc.simple_poll != NULL)
1867
avahi_simple_poll_free(mc.simple_poll);
2423
1868
2424
1869
if(gnutls_initialized){
2425
1870
gnutls_certificate_free_credentials(mc.cred);
2430
1875
if(gpgme_initialized){
2431
1876
gpgme_release(mc.ctx);
2432
1877
}
2433
2434
/* Cleans up the circular linked list of Mandos servers the client
2435
has seen */
1878
1879
/* cleans up the circular linked list of mandos servers the client has seen */
2436
1880
if(mc.current_server != NULL){
2437
1881
mc.current_server->prev->next = NULL;
2438
1882
while(mc.current_server != NULL){
2442
1886
}
2443
1887
}
2444
1888
2445
/* Re-raise priviliges */
2446
{
2447
raise_privileges();
2448
2449
/* Run network hooks */
2450
run_network_hooks("stop", interfaces_hooks != NULL ?
2451
interfaces_hooks : "", delay);
2452
2453
/* Take down the network interfaces which were brought up */
2454
{
2455
char *interface = NULL;
2456
while((interface=argz_next(interfaces_to_take_down,
2457
interfaces_to_take_down_size,
2458
interface))){
2459
ret_errno = take_down_interface(interface);
2460
if(ret_errno != 0){
2461
errno = ret_errno;
2462
perror_plus("Failed to take down interface");
1889
/* Take down the network interface */
1890
if(take_down_interface){
1891
/* Re-raise priviliges */
1892
errno = 0;
1893
ret = seteuid(0);
1894
if(ret == -1){
1895
perror_plus("seteuid");
1896
}
1897
if(geteuid() == 0){
1898
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1899
if(ret == -1){
1900
perror_plus("ioctl SIOCGIFFLAGS");
1901
} else if(network.ifr_flags & IFF_UP) {
1902
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1903
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1904
if(ret == -1){
1905
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2463
1906
}
2464
1907
}
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2467
" down\n");
1908
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1909
if(ret == -1){
1910
perror_plus("close");
1911
}
1912
/* Lower privileges permanently */
1913
errno = 0;
1914
ret = setuid(uid);
1915
if(ret == -1){
1916
perror_plus("setuid");
2468
1917
}
2469
1918
}
2470
2471
lower_privileges_permanently();
2472
1919
}
2473
1920
2474
free(interfaces_to_take_down);
2475
free(interfaces_hooks);
2476
2477
1921
/* Removes the GPGME temp directory and all files inside */
2478
1922
if(tempdir_created){
2479
1923
struct dirent **direntries = NULL;
2480
1924
struct dirent *direntry = NULL;
2481
int numentries = scandir(tempdir, &direntries, notdotentries,
2482
alphasort);
2483
if (numentries > 0){
2484
for(int i = 0; i < numentries; i++){
1925
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1926
if (ret > 0){
1927
for(int i = 0; i < ret; i++){
2485
1928
direntry = direntries[i];
2486
1929
char *fullname = NULL;
2487
1930
ret = asprintf(&fullname, "%s/%s", tempdir,
2492
1935
}
2493
1936
ret = remove(fullname);
2494
1937
if(ret == -1){
2495
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2496
strerror(errno));
1938
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1939
strerror(errno));
2497
1940
}
2498
1941
free(fullname);
2499
1942
}
2500
1943
}
2501
1944
2502
/* need to clean even if 0 because man page doesn't specify */
1945
/* need to be cleaned even if ret == 0 because man page dont specify */
2503
1946
free(direntries);
2504
if (numentries == -1){
1947
if (ret == -1){
2505
1948
perror_plus("scandir");
2506
1949
}
2507
1950
ret = rmdir(tempdir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0