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- Committer: Teddy Hogeborn
- Date: 2010-09-12 03:00:40 UTC
- Revision ID: teddy@fukt.bsnet.se-20100912030040-b0uopyennste9fdh
Documentation changes:
* DBUS-API: New file documenting the server D-Bus interface.
* clients.conf: Add examples of new approval settings.
* debian/mandos.docs: Added "DBUS-API".
* mandos-clients.conf.xml (OPTIONS): Added "approved_by_default",
"approval_delay", and
"approval_duration".
* mandos.xml (D-BUS INTERFACE): Refer to the "DBUS-API" file.
(BUGS): Remove mention of lack of a remote query interface.
* DBUS-API: New file documenting the server D-Bus interface.
* clients.conf: Add examples of new approval settings.
* debian/mandos.docs: Added "DBUS-API".
* mandos-clients.conf.xml (OPTIONS): Added "approved_by_default",
"approval_delay", and
"approval_duration".
* mandos.xml (D-BUS INTERFACE): Refer to the "DBUS-API" file.
(BUGS): Remove mention of lack of a remote query interface.
- files removed:
- debian/mandos-client.examples
- 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() */
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 */
66
#include <time.h> /* nanosleep(), time(), sleep() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
67
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
68
SIOCSIFFLAGS, if_indextoname(),
69
69
if_nametoindex(), IF_NAMESIZE */
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
144
/* Doubly linked list that need to be circularly linked when used */
145
typedef struct server{
146
const char *ip;
147
in_port_t port;
148
AvahiIfIndex if_index;
149
int af;
150
struct timespec last_seen;
151
struct server *next;
152
struct server *prev;
153
} server;
154
132
155
133
/* Used for passing in values through the Avahi callback functions */
156
134
typedef struct {
135
AvahiSimplePoll *simple_poll;
157
136
AvahiServer *server;
158
137
gnutls_certificate_credentials_t cred;
159
138
unsigned int dh_bits;
160
139
gnutls_dh_params_t dh_params;
161
140
const char *priority;
162
141
gpgme_ctx_t ctx;
163
server *current_server;
164
142
} mandos_context;
165
143
166
/* global so signal handler can reach it*/
167
AvahiSimplePoll *simple_poll;
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
168
148
169
149
sig_atomic_t quit_now = 0;
170
150
int signal_received = 0;
171
151
172
/* Function to use when printing errors */
173
void perror_plus(const char *print_text){
174
int e = errno;
175
fprintf(stderr, "Mandos plugin %s: ",
176
program_invocation_short_name);
177
errno = e;
178
perror(print_text);
179
}
180
181
__attribute__((format (gnu_printf, 2, 3)))
182
int fprintf_plus(FILE *stream, const char *format, ...){
183
va_list ap;
184
va_start (ap, format);
185
186
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
187
program_invocation_short_name));
188
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
189
}
190
191
152
/*
192
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
193
154
* bytes. "buffer_capacity" is how much is currently allocated,
194
155
* "buffer_length" is how much is already used.
195
156
*/
196
157
size_t incbuffer(char **buffer, size_t buffer_length,
197
size_t buffer_capacity){
158
size_t buffer_capacity){
198
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
199
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
200
161
if(buffer == NULL){
205
166
return buffer_capacity;
206
167
}
207
168
208
/* Add server to set of servers to retry periodically */
209
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
210
int af, server **current_server){
211
int ret;
212
server *new_server = malloc(sizeof(server));
213
if(new_server == NULL){
214
perror_plus("malloc");
215
return false;
216
}
217
*new_server = (server){ .ip = strdup(ip),
218
.port = port,
219
.if_index = if_index,
220
.af = af };
221
if(new_server->ip == NULL){
222
perror_plus("strdup");
223
return false;
224
}
225
/* Special case of first server */
226
if(*current_server == NULL){
227
new_server->next = new_server;
228
new_server->prev = new_server;
229
*current_server = new_server;
230
/* Place the new server last in the list */
231
} else {
232
new_server->next = *current_server;
233
new_server->prev = (*current_server)->prev;
234
new_server->prev->next = new_server;
235
(*current_server)->prev = new_server;
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
242
return true;
243
}
244
245
169
/*
246
170
* Initialize GPGME.
247
171
*/
248
static bool init_gpgme(const char *seckey, const char *pubkey,
249
const char *tempdir, mandos_context *mc){
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
250
174
gpgme_error_t rc;
251
175
gpgme_engine_info_t engine_info;
252
176
177
253
178
/*
254
179
* Helper function to insert pub and seckey to the engine keyring.
255
180
*/
260
185
261
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
262
187
if(fd == -1){
263
perror_plus("open");
188
perror("open");
264
189
return false;
265
190
}
266
191
267
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
268
193
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));
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
271
196
return false;
272
197
}
273
198
274
rc = gpgme_op_import(mc->ctx, pgp_data);
199
rc = gpgme_op_import(mc.ctx, pgp_data);
275
200
if(rc != GPG_ERR_NO_ERROR){
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
278
203
return false;
279
204
}
280
205
281
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
282
207
if(ret == -1){
283
perror_plus("close");
208
perror("close");
284
209
}
285
210
gpgme_data_release(pgp_data);
286
211
return true;
287
212
}
288
213
289
214
if(debug){
290
fprintf_plus(stderr, "Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
291
216
}
292
217
293
218
/* Init GPGME */
294
219
gpgme_check_version(NULL);
295
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
296
221
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));
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
299
224
return false;
300
225
}
301
226
302
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
303
228
rc = gpgme_get_engine_info(&engine_info);
304
229
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));
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
307
232
return false;
308
233
}
309
234
while(engine_info != NULL){
315
240
engine_info = engine_info->next;
316
241
}
317
242
if(engine_info == NULL){
318
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
319
tempdir);
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
320
244
return false;
321
245
}
322
246
323
247
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc->ctx));
248
rc = gpgme_new(&(mc.ctx));
325
249
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));
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
329
252
return false;
330
253
}
331
254
342
265
*/
343
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
267
size_t crypto_size,
345
char **plaintext,
346
mandos_context *mc){
268
char **plaintext){
347
269
gpgme_data_t dh_crypto, dh_plain;
348
270
gpgme_error_t rc;
349
271
ssize_t ret;
351
273
ssize_t plaintext_length = 0;
352
274
353
275
if(debug){
354
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
355
277
}
356
278
357
279
/* Create new GPGME data buffer from memory cryptotext */
358
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
359
281
0);
360
282
if(rc != GPG_ERR_NO_ERROR){
361
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
363
285
return -1;
364
286
}
365
287
366
288
/* Create new empty GPGME data buffer for the plaintext */
367
289
rc = gpgme_data_new(&dh_plain);
368
290
if(rc != GPG_ERR_NO_ERROR){
369
fprintf_plus(stderr, "Mandos plugin mandos-client: "
370
"bad gpgme_data_new: %s: %s\n",
371
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
372
293
gpgme_data_release(dh_crypto);
373
294
return -1;
374
295
}
375
296
376
297
/* Decrypt data from the cryptotext data buffer to the plaintext
377
298
data buffer */
378
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
379
300
if(rc != GPG_ERR_NO_ERROR){
380
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
381
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
382
303
plaintext_length = -1;
383
304
if(debug){
384
305
gpgme_decrypt_result_t result;
385
result = gpgme_op_decrypt_result(mc->ctx);
306
result = gpgme_op_decrypt_result(mc.ctx);
386
307
if(result == NULL){
387
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
388
309
} else {
389
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
390
result->unsupported_algorithm);
391
fprintf_plus(stderr, "Wrong key usage: %u\n",
392
result->wrong_key_usage);
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
393
314
if(result->file_name != NULL){
394
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
395
316
}
396
317
gpgme_recipient_t recipient;
397
318
recipient = result->recipients;
398
319
while(recipient != NULL){
399
fprintf_plus(stderr, "Public key algorithm: %s\n",
400
gpgme_pubkey_algo_name
401
(recipient->pubkey_algo));
402
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
403
fprintf_plus(stderr, "Secret key available: %s\n",
404
recipient->status == GPG_ERR_NO_SECKEY
405
? "No" : "Yes");
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
406
326
recipient = recipient->next;
407
327
}
408
328
}
411
331
}
412
332
413
333
if(debug){
414
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
415
335
}
416
336
417
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
418
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
419
perror_plus("gpgme_data_seek");
339
perror("gpgme_data_seek");
420
340
plaintext_length = -1;
421
341
goto decrypt_end;
422
342
}
424
344
*plaintext = NULL;
425
345
while(true){
426
346
plaintext_capacity = incbuffer(plaintext,
427
(size_t)plaintext_length,
428
plaintext_capacity);
347
(size_t)plaintext_length,
348
plaintext_capacity);
429
349
if(plaintext_capacity == 0){
430
perror_plus("incbuffer");
431
plaintext_length = -1;
432
goto decrypt_end;
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
433
353
}
434
354
435
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
440
360
break;
441
361
}
442
362
if(ret < 0){
443
perror_plus("gpgme_data_read");
363
perror("gpgme_data_read");
444
364
plaintext_length = -1;
445
365
goto decrypt_end;
446
366
}
448
368
}
449
369
450
370
if(debug){
451
fprintf_plus(stderr, "Decrypted password is: ");
371
fprintf(stderr, "Decrypted password is: ");
452
372
for(ssize_t i = 0; i < plaintext_length; i++){
453
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
454
374
}
466
386
}
467
387
468
388
static const char * safer_gnutls_strerror(int value){
469
const char *ret = gnutls_strerror(value);
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
470
391
if(ret == NULL)
471
392
ret = "(unknown)";
472
393
return ret;
475
396
/* GnuTLS log function callback */
476
397
static void debuggnutls(__attribute__((unused)) int level,
477
398
const char* string){
478
fprintf_plus(stderr, "GnuTLS: %s", string);
399
fprintf(stderr, "GnuTLS: %s", string);
479
400
}
480
401
481
402
static int init_gnutls_global(const char *pubkeyfilename,
482
const char *seckeyfilename,
483
mandos_context *mc){
403
const char *seckeyfilename){
484
404
int ret;
485
405
486
406
if(debug){
487
fprintf_plus(stderr, "Initializing GnuTLS\n");
407
fprintf(stderr, "Initializing GnuTLS\n");
488
408
}
489
409
490
410
ret = gnutls_global_init();
491
411
if(ret != GNUTLS_E_SUCCESS){
492
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
493
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
494
414
return -1;
495
415
}
496
416
503
423
}
504
424
505
425
/* OpenPGP credentials */
506
ret = gnutls_certificate_allocate_credentials(&mc->cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
507
427
if(ret != GNUTLS_E_SUCCESS){
508
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
509
safer_gnutls_strerror(ret));
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
510
433
gnutls_global_deinit();
511
434
return -1;
512
435
}
513
436
514
437
if(debug){
515
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
516
" secret key %s as GnuTLS credentials\n",
517
pubkeyfilename,
518
seckeyfilename);
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
440
seckeyfilename);
519
441
}
520
442
521
443
ret = gnutls_certificate_set_openpgp_key_file
522
(mc->cred, pubkeyfilename, seckeyfilename,
444
(mc.cred, pubkeyfilename, seckeyfilename,
523
445
GNUTLS_OPENPGP_FMT_BASE64);
524
446
if(ret != GNUTLS_E_SUCCESS){
525
fprintf_plus(stderr,
526
"Error[%d] while reading the OpenPGP key pair ('%s',"
527
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
528
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
529
safer_gnutls_strerror(ret));
447
fprintf(stderr,
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
530
452
goto globalfail;
531
453
}
532
454
533
455
/* GnuTLS server initialization */
534
ret = gnutls_dh_params_init(&mc->dh_params);
456
ret = gnutls_dh_params_init(&mc.dh_params);
535
457
if(ret != GNUTLS_E_SUCCESS){
536
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
537
" initialization: %s\n",
538
safer_gnutls_strerror(ret));
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
539
460
goto globalfail;
540
461
}
541
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
542
463
if(ret != GNUTLS_E_SUCCESS){
543
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
544
safer_gnutls_strerror(ret));
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
545
466
goto globalfail;
546
467
}
547
468
548
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
549
470
550
471
return 0;
551
472
552
473
globalfail:
553
474
554
gnutls_certificate_free_credentials(mc->cred);
475
gnutls_certificate_free_credentials(mc.cred);
555
476
gnutls_global_deinit();
556
gnutls_dh_params_deinit(mc->dh_params);
477
gnutls_dh_params_deinit(mc.dh_params);
557
478
return -1;
558
479
}
559
480
560
static int init_gnutls_session(gnutls_session_t *session,
561
mandos_context *mc){
481
static int init_gnutls_session(gnutls_session_t *session){
562
482
int ret;
563
483
/* GnuTLS session creation */
564
484
do {
568
488
}
569
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
570
490
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr,
572
"Error in GnuTLS session initialization: %s\n",
573
safer_gnutls_strerror(ret));
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
safer_gnutls_strerror(ret));
574
493
}
575
494
576
495
{
577
496
const char *err;
578
497
do {
579
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
580
499
if(quit_now){
581
500
gnutls_deinit(*session);
582
501
return -1;
583
502
}
584
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
585
504
if(ret != GNUTLS_E_SUCCESS){
586
fprintf_plus(stderr, "Syntax error at: %s\n", err);
587
fprintf_plus(stderr, "GnuTLS error: %s\n",
588
safer_gnutls_strerror(ret));
505
fprintf(stderr, "Syntax error at: %s\n", err);
506
fprintf(stderr, "GnuTLS error: %s\n",
507
safer_gnutls_strerror(ret));
589
508
gnutls_deinit(*session);
590
509
return -1;
591
510
}
593
512
594
513
do {
595
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
596
mc->cred);
515
mc.cred);
597
516
if(quit_now){
598
517
gnutls_deinit(*session);
599
518
return -1;
600
519
}
601
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
602
521
if(ret != GNUTLS_E_SUCCESS){
603
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
604
safer_gnutls_strerror(ret));
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
safer_gnutls_strerror(ret));
605
524
gnutls_deinit(*session);
606
525
return -1;
607
526
}
609
528
/* ignore client certificate if any. */
610
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
611
530
612
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
613
532
614
533
return 0;
615
534
}
619
538
__attribute__((unused)) const char *txt){}
620
539
621
540
/* Called when a Mandos server is found */
622
static int start_mandos_communication(const char *ip, in_port_t port,
541
static int start_mandos_communication(const char *ip, uint16_t port,
623
542
AvahiIfIndex if_index,
624
int af, mandos_context *mc){
543
int af){
625
544
int ret, tcp_sd = -1;
626
545
ssize_t sret;
627
546
union {
652
571
pf = PF_INET;
653
572
break;
654
573
default:
655
fprintf_plus(stderr, "Bad address family: %d\n", af);
574
fprintf(stderr, "Bad address family: %d\n", af);
656
575
errno = EINVAL;
657
576
return -1;
658
577
}
659
578
660
ret = init_gnutls_session(&session, mc);
579
ret = init_gnutls_session(&session);
661
580
if(ret != 0){
662
581
return -1;
663
582
}
664
583
665
584
if(debug){
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
667
PRIuMAX "\n", ip, (uintmax_t)port);
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
586
"\n", ip, port);
668
587
}
669
588
670
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
671
590
if(tcp_sd < 0){
672
591
int e = errno;
673
perror_plus("socket");
592
perror("socket");
674
593
errno = e;
675
594
goto mandos_end;
676
595
}
690
609
}
691
610
if(ret < 0 ){
692
611
int e = errno;
693
perror_plus("inet_pton");
612
perror("inet_pton");
694
613
errno = e;
695
614
goto mandos_end;
696
615
}
697
616
if(ret == 0){
698
617
int e = errno;
699
fprintf_plus(stderr, "Bad address: %s\n", ip);
618
fprintf(stderr, "Bad address: %s\n", ip);
700
619
errno = e;
701
620
goto mandos_end;
702
621
}
703
622
if(af == AF_INET6){
704
to.in6.sin6_port = htons(port);
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
705
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
706
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
707
-Wunreachable-code*/
629
-Wunreachable-code*/
708
630
if(if_index == AVAHI_IF_UNSPEC){
709
fprintf_plus(stderr, "An IPv6 link-local address is"
710
" incomplete without a network interface\n");
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
711
633
errno = EINVAL;
712
634
goto mandos_end;
713
635
}
729
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
730
652
char interface[IF_NAMESIZE];
731
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
732
perror_plus("if_indextoname");
654
perror("if_indextoname");
733
655
} else {
734
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
735
"\n", ip, interface, (uintmax_t)port);
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
736
658
}
737
659
} else {
738
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
739
ip, (uintmax_t)port);
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
740
662
}
741
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
742
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
749
671
sizeof(addrstr));
750
672
}
751
673
if(pcret == NULL){
752
perror_plus("inet_ntop");
674
perror("inet_ntop");
753
675
} else {
754
676
if(strcmp(addrstr, ip) != 0){
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
756
678
}
757
679
}
758
680
}
768
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
769
691
}
770
692
if(ret < 0){
771
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
772
int e = errno;
773
perror_plus("connect");
774
errno = e;
775
}
693
int e = errno;
694
perror("connect");
695
errno = e;
776
696
goto mandos_end;
777
697
}
778
698
786
706
while(true){
787
707
size_t out_size = strlen(out);
788
708
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
789
out_size - written));
709
out_size - written));
790
710
if(ret == -1){
791
711
int e = errno;
792
perror_plus("write");
712
perror("write");
793
713
errno = e;
794
714
goto mandos_end;
795
715
}
812
732
}
813
733
814
734
if(debug){
815
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
735
fprintf(stderr, "Establishing TLS session with %s\n", ip);
816
736
}
817
737
818
738
if(quit_now){
820
740
goto mandos_end;
821
741
}
822
742
823
/* This casting via intptr_t is to eliminate warning about casting
824
an int to a pointer type. This is exactly how the GnuTLS Guile
825
function "set-session-transport-fd!" does it. */
826
gnutls_transport_set_ptr(session,
827
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
743
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
828
744
829
745
if(quit_now){
830
746
errno = EINTR;
841
757
842
758
if(ret != GNUTLS_E_SUCCESS){
843
759
if(debug){
844
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
760
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
845
761
gnutls_perror(ret);
846
762
}
847
763
errno = EPROTO;
851
767
/* Read OpenPGP packet that contains the wanted password */
852
768
853
769
if(debug){
854
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
855
" %s\n", ip);
770
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
771
ip);
856
772
}
857
773
858
774
while(true){
863
779
}
864
780
865
781
buffer_capacity = incbuffer(&buffer, buffer_length,
866
buffer_capacity);
782
buffer_capacity);
867
783
if(buffer_capacity == 0){
868
784
int e = errno;
869
perror_plus("incbuffer");
785
perror("incbuffer");
870
786
errno = e;
871
787
goto mandos_end;
872
788
}
896
812
}
897
813
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
898
814
if(ret < 0){
899
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
900
"***\n");
815
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
901
816
gnutls_perror(ret);
902
817
errno = EPROTO;
903
818
goto mandos_end;
904
819
}
905
820
break;
906
821
default:
907
fprintf_plus(stderr, "Unknown error while reading data from"
908
" encrypted session with Mandos server\n");
822
fprintf(stderr, "Unknown error while reading data from"
823
" encrypted session with Mandos server\n");
909
824
gnutls_bye(session, GNUTLS_SHUT_RDWR);
910
825
errno = EIO;
911
826
goto mandos_end;
916
831
}
917
832
918
833
if(debug){
919
fprintf_plus(stderr, "Closing TLS session\n");
834
fprintf(stderr, "Closing TLS session\n");
920
835
}
921
836
922
837
if(quit_now){
934
849
935
850
if(buffer_length > 0){
936
851
ssize_t decrypted_buffer_size;
937
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
938
&decrypted_buffer, mc);
852
decrypted_buffer_size = pgp_packet_decrypt(buffer,
853
buffer_length,
854
&decrypted_buffer);
939
855
if(decrypted_buffer_size >= 0){
940
856
941
857
written = 0;
951
867
if(ret == 0 and ferror(stdout)){
952
868
int e = errno;
953
869
if(debug){
954
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
955
strerror(errno));
870
fprintf(stderr, "Error writing encrypted data: %s\n",
871
strerror(errno));
956
872
}
957
873
errno = e;
958
874
goto mandos_end;
977
893
if(e == 0){
978
894
e = errno;
979
895
}
980
perror_plus("close");
896
perror("close");
981
897
}
982
898
gnutls_deinit(session);
983
errno = e;
984
899
if(quit_now){
985
errno = EINTR;
900
e = EINTR;
986
901
retval = -1;
987
902
}
903
errno = e;
988
904
}
989
905
return retval;
990
906
}
1002
918
AVAHI_GCC_UNUSED AvahiStringList *txt,
1003
919
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1004
920
flags,
1005
void* mc){
1006
if(r == NULL){
1007
return;
1008
}
921
AVAHI_GCC_UNUSED void* userdata){
922
assert(r);
1009
923
1010
924
/* Called whenever a service has been resolved successfully or
1011
925
timed out */
1017
931
switch(event){
1018
932
default:
1019
933
case AVAHI_RESOLVER_FAILURE:
1020
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1021
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1022
domain,
1023
avahi_strerror(avahi_server_errno
1024
(((mandos_context*)mc)->server)));
934
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
935
" of type '%s' in domain '%s': %s\n", name, type, domain,
936
avahi_strerror(avahi_server_errno(mc.server)));
1025
937
break;
1026
938
1027
939
case AVAHI_RESOLVER_FOUND:
1029
941
char ip[AVAHI_ADDRESS_STR_MAX];
1030
942
avahi_address_snprint(ip, sizeof(ip), address);
1031
943
if(debug){
1032
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1033
PRIdMAX ") on port %" PRIu16 "\n", name,
1034
host_name, ip, (intmax_t)interface, port);
944
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
945
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
946
ip, (intmax_t)interface, port);
1035
947
}
1036
int ret = start_mandos_communication(ip, (in_port_t)port,
1037
interface,
1038
avahi_proto_to_af(proto),
1039
mc);
948
int ret = start_mandos_communication(ip, port, interface,
949
avahi_proto_to_af(proto));
1040
950
if(ret == 0){
1041
avahi_simple_poll_quit(simple_poll);
1042
} else {
1043
if(not add_server(ip, (in_port_t)port, interface,
1044
avahi_proto_to_af(proto),
1045
&((mandos_context*)mc)->current_server)){
1046
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1047
" list\n", name);
1048
}
951
avahi_simple_poll_quit(mc.simple_poll);
1049
952
}
1050
953
}
1051
954
}
1061
964
const char *domain,
1062
965
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1063
966
flags,
1064
void* mc){
1065
if(b == NULL){
1066
return;
1067
}
967
AVAHI_GCC_UNUSED void* userdata){
968
assert(b);
1068
969
1069
970
/* Called whenever a new services becomes available on the LAN or
1070
971
is removed from the LAN */
1077
978
default:
1078
979
case AVAHI_BROWSER_FAILURE:
1079
980
1080
fprintf_plus(stderr, "(Avahi browser) %s\n",
1081
avahi_strerror(avahi_server_errno
1082
(((mandos_context*)mc)->server)));
1083
avahi_simple_poll_quit(simple_poll);
981
fprintf(stderr, "(Avahi browser) %s\n",
982
avahi_strerror(avahi_server_errno(mc.server)));
983
avahi_simple_poll_quit(mc.simple_poll);
1084
984
return;
1085
985
1086
986
case AVAHI_BROWSER_NEW:
1089
989
the callback function is called the Avahi server will free the
1090
990
resolver for us. */
1091
991
1092
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1093
interface, protocol, name, type,
1094
domain, protocol, 0,
1095
resolve_callback, mc) == NULL)
1096
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1097
" %s\n", name,
1098
avahi_strerror(avahi_server_errno
1099
(((mandos_context*)mc)->server)));
992
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
993
name, type, domain, protocol, 0,
994
resolve_callback, NULL) == NULL)
995
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
996
name, avahi_strerror(avahi_server_errno(mc.server)));
1100
997
break;
1101
998
1102
999
case AVAHI_BROWSER_REMOVE:
1105
1002
case AVAHI_BROWSER_ALL_FOR_NOW:
1106
1003
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1107
1004
if(debug){
1108
fprintf_plus(stderr, "No Mandos server found, still"
1109
" searching...\n");
1005
fprintf(stderr, "No Mandos server found, still searching...\n");
1110
1006
}
1111
1007
break;
1112
1008
}
1113
1009
}
1114
1010
1115
/* Signal handler that stops main loop after SIGTERM */
1011
/* stop main loop after sigterm has been called */
1116
1012
static void handle_sigterm(int sig){
1117
1013
if(quit_now){
1118
1014
return;
1120
1016
quit_now = 1;
1121
1017
signal_received = sig;
1122
1018
int old_errno = errno;
1123
/* set main loop to exit */
1124
if(simple_poll != NULL){
1125
avahi_simple_poll_quit(simple_poll);
1019
if(mc.simple_poll != NULL){
1020
avahi_simple_poll_quit(mc.simple_poll);
1126
1021
}
1127
1022
errno = old_errno;
1128
1023
}
1129
1024
1130
bool get_flags(const char *ifname, struct ifreq *ifr){
1131
int ret;
1132
error_t ret_errno;
1133
1134
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1135
if(s < 0){
1136
ret_errno = errno;
1137
perror_plus("socket");
1138
errno = ret_errno;
1139
return false;
1140
}
1141
strcpy(ifr->ifr_name, ifname);
1142
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1143
if(ret == -1){
1144
if(debug){
1145
ret_errno = errno;
1146
perror_plus("ioctl SIOCGIFFLAGS");
1147
errno = ret_errno;
1148
}
1149
return false;
1150
}
1151
return true;
1152
}
1153
1154
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1156
/* Reject the loopback device */
1157
if(ifr->ifr_flags & IFF_LOOPBACK){
1158
if(debug){
1159
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1160
ifname);
1161
}
1162
return false;
1163
}
1164
/* Accept point-to-point devices only if connect_to is specified */
1165
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1166
if(debug){
1167
fprintf_plus(stderr, "Accepting point-to-point interface"
1168
" \"%s\"\n", ifname);
1169
}
1170
return true;
1171
}
1172
/* Otherwise, reject non-broadcast-capable devices */
1173
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1174
if(debug){
1175
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1176
" \"%s\"\n", ifname);
1177
}
1178
return false;
1179
}
1180
/* Reject non-ARP interfaces (including dummy interfaces) */
1181
if(ifr->ifr_flags & IFF_NOARP){
1182
if(debug){
1183
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1184
ifname);
1185
}
1186
return false;
1187
}
1188
1189
/* Accept this device */
1190
if(debug){
1191
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1192
}
1193
return true;
1194
}
1195
1196
1025
/*
1197
1026
* This function determines if a directory entry in /sys/class/net
1198
1027
* corresponds to an acceptable network device.
1199
1028
* (This function is passed to scandir(3) as a filter function.)
1200
1029
*/
1201
1030
int good_interface(const struct dirent *if_entry){
1031
ssize_t ssret;
1032
char *flagname = NULL;
1033
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1034
if_entry->d_name);
1035
if(ret < 0){
1036
perror("asprintf");
1037
return 0;
1038
}
1202
1039
if(if_entry->d_name[0] == '.'){
1203
1040
return 0;
1204
1041
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
if(not good_flags(if_entry->d_name, &ifr)){
1216
return 0;
1217
}
1218
return 1;
1219
}
1220
1221
/*
1222
* This function determines if a network interface is up.
1223
*/
1224
bool interface_is_up(const char *interface){
1225
struct ifreq ifr;
1226
if(not get_flags(interface, &ifr)){
1227
if(debug){
1228
fprintf_plus(stderr, "Failed to get flags for interface "
1229
"\"%s\"\n", interface);
1230
}
1231
return false;
1232
}
1233
1234
return (bool)(ifr.ifr_flags & IFF_UP);
1235
}
1236
1237
/*
1238
* This function determines if a network interface is running
1239
*/
1240
bool interface_is_running(const char *interface){
1241
struct ifreq ifr;
1242
if(not get_flags(interface, &ifr)){
1243
if(debug){
1244
fprintf_plus(stderr, "Failed to get flags for interface "
1245
"\"%s\"\n", interface);
1246
}
1247
return false;
1248
}
1249
1250
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1251
}
1252
1253
int notdotentries(const struct dirent *direntry){
1254
/* Skip "." and ".." */
1255
if(direntry->d_name[0] == '.'
1256
and (direntry->d_name[1] == '\0'
1257
or (direntry->d_name[1] == '.'
1258
and direntry->d_name[2] == '\0'))){
1259
return 0;
1260
}
1261
return 1;
1262
}
1263
1264
/* Is this directory entry a runnable program? */
1265
int runnable_hook(const struct dirent *direntry){
1266
int ret;
1267
size_t sret;
1268
struct stat st;
1269
1270
if((direntry->d_name)[0] == '\0'){
1271
/* Empty name? */
1272
return 0;
1273
}
1274
1275
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1276
"abcdefghijklmnopqrstuvwxyz"
1277
"0123456789"
1278
"_-");
1279
if((direntry->d_name)[sret] != '\0'){
1280
/* Contains non-allowed characters */
1281
if(debug){
1282
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1283
direntry->d_name);
1284
}
1285
return 0;
1286
}
1287
1288
char *fullname = NULL;
1289
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1290
if(ret < 0){
1291
perror_plus("asprintf");
1292
return 0;
1293
}
1294
1295
ret = stat(fullname, &st);
1296
if(ret == -1){
1297
if(debug){
1298
perror_plus("Could not stat hook");
1299
}
1300
return 0;
1301
}
1302
if(not (S_ISREG(st.st_mode))){
1303
/* Not a regular file */
1304
if(debug){
1305
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1306
direntry->d_name);
1307
}
1308
return 0;
1309
}
1310
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1311
/* Not executable */
1312
if(debug){
1313
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1314
direntry->d_name);
1315
}
1316
return 0;
1317
}
1042
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1043
if(flags_fd == -1){
1044
perror("open");
1045
return 0;
1046
}
1047
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1048
/* read line from flags_fd */
1049
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1050
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1051
flagstring[(size_t)to_read] = '\0';
1052
if(flagstring == NULL){
1053
perror("malloc");
1054
close(flags_fd);
1055
return 0;
1056
}
1057
while(to_read > 0){
1058
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1059
(size_t)to_read));
1060
if(ssret == -1){
1061
perror("read");
1062
free(flagstring);
1063
close(flags_fd);
1064
return 0;
1065
}
1066
to_read -= ssret;
1067
if(ssret == 0){
1068
break;
1069
}
1070
}
1071
close(flags_fd);
1072
intmax_t tmpmax;
1073
char *tmp;
1074
errno = 0;
1075
tmpmax = strtoimax(flagstring, &tmp, 0);
1076
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1077
and not (isspace(*tmp)))
1078
or tmpmax != (ifreq_flags)tmpmax){
1079
if(debug){
1080
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1081
flagstring, if_entry->d_name);
1082
}
1083
free(flagstring);
1084
return 0;
1085
}
1086
free(flagstring);
1087
ifreq_flags flags = (ifreq_flags)tmpmax;
1088
/* Reject the loopback device */
1089
if(flags & IFF_LOOPBACK){
1090
if(debug){
1091
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1092
if_entry->d_name);
1093
}
1094
return 0;
1095
}
1096
/* Accept point-to-point devices only if connect_to is specified */
1097
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1098
if(debug){
1099
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1100
if_entry->d_name);
1101
}
1102
return 1;
1103
}
1104
/* Otherwise, reject non-broadcast-capable devices */
1105
if(not (flags & IFF_BROADCAST)){
1106
if(debug){
1107
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1108
if_entry->d_name);
1109
}
1110
return 0;
1111
}
1112
/* Accept this device */
1318
1113
if(debug){
1319
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1320
direntry->d_name);
1114
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1115
if_entry->d_name);
1321
1116
}
1322
1117
return 1;
1323
1118
}
1324
1119
1325
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1326
mandos_context *mc){
1327
int ret;
1328
struct timespec now;
1329
struct timespec waited_time;
1330
intmax_t block_time;
1331
1332
while(true){
1333
if(mc->current_server == NULL){
1334
if (debug){
1335
fprintf_plus(stderr, "Wait until first server is found."
1336
" No timeout!\n");
1337
}
1338
ret = avahi_simple_poll_iterate(s, -1);
1339
} else {
1340
if (debug){
1341
fprintf_plus(stderr, "Check current_server if we should run"
1342
" it, or wait\n");
1343
}
1344
/* the current time */
1345
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1346
if(ret == -1){
1347
perror_plus("clock_gettime");
1348
return -1;
1349
}
1350
/* Calculating in ms how long time between now and server
1351
who we visted longest time ago. Now - last seen. */
1352
waited_time.tv_sec = (now.tv_sec
1353
- mc->current_server->last_seen.tv_sec);
1354
waited_time.tv_nsec = (now.tv_nsec
1355
- mc->current_server->last_seen.tv_nsec);
1356
/* total time is 10s/10,000ms.
1357
Converting to s from ms by dividing by 1,000,
1358
and ns to ms by dividing by 1,000,000. */
1359
block_time = ((retry_interval
1360
- ((intmax_t)waited_time.tv_sec * 1000))
1361
- ((intmax_t)waited_time.tv_nsec / 1000000));
1362
1363
if (debug){
1364
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1365
block_time);
1366
}
1367
1368
if(block_time <= 0){
1369
ret = start_mandos_communication(mc->current_server->ip,
1370
mc->current_server->port,
1371
mc->current_server->if_index,
1372
mc->current_server->af, mc);
1373
if(ret == 0){
1374
avahi_simple_poll_quit(s);
1375
return 0;
1376
}
1377
ret = clock_gettime(CLOCK_MONOTONIC,
1378
&mc->current_server->last_seen);
1379
if(ret == -1){
1380
perror_plus("clock_gettime");
1381
return -1;
1382
}
1383
mc->current_server = mc->current_server->next;
1384
block_time = 0; /* Call avahi to find new Mandos
1385
servers, but don't block */
1386
}
1387
1388
ret = avahi_simple_poll_iterate(s, (int)block_time);
1389
}
1390
if(ret != 0){
1391
if (ret > 0 or errno != EINTR){
1392
return (ret != 1) ? ret : 0;
1393
}
1394
}
1395
}
1396
}
1397
1398
/* Set effective uid to 0, return errno */
1399
error_t raise_privileges(void){
1400
error_t old_errno = errno;
1401
error_t ret_errno = 0;
1402
if(seteuid(0) == -1){
1403
ret_errno = errno;
1404
perror_plus("seteuid");
1405
}
1406
errno = old_errno;
1407
return ret_errno;
1408
}
1409
1410
/* Set effective and real user ID to 0. Return errno. */
1411
error_t raise_privileges_permanently(void){
1412
error_t old_errno = errno;
1413
error_t ret_errno = raise_privileges();
1414
if(ret_errno != 0){
1415
errno = old_errno;
1416
return ret_errno;
1417
}
1418
if(setuid(0) == -1){
1419
ret_errno = errno;
1420
perror_plus("seteuid");
1421
}
1422
errno = old_errno;
1423
return ret_errno;
1424
}
1425
1426
/* Set effective user ID to unprivileged saved user ID */
1427
error_t lower_privileges(void){
1428
error_t old_errno = errno;
1429
error_t ret_errno = 0;
1430
if(seteuid(uid) == -1){
1431
ret_errno = errno;
1432
perror_plus("seteuid");
1433
}
1434
errno = old_errno;
1435
return ret_errno;
1436
}
1437
1438
/* Lower privileges permanently */
1439
error_t lower_privileges_permanently(void){
1440
error_t old_errno = errno;
1441
error_t ret_errno = 0;
1442
if(setuid(uid) == -1){
1443
ret_errno = errno;
1444
perror_plus("setuid");
1445
}
1446
errno = old_errno;
1447
return ret_errno;
1448
}
1449
1450
bool run_network_hooks(const char *mode, const char *interface,
1451
const float delay){
1452
struct dirent **direntries;
1453
struct dirent *direntry;
1454
int ret;
1455
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1456
alphasort);
1457
if(numhooks == -1){
1458
if(errno == ENOENT){
1459
if(debug){
1460
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1461
" found\n", hookdir);
1462
}
1463
} else {
1464
perror_plus("scandir");
1465
}
1466
} else {
1467
int devnull = open("/dev/null", O_RDONLY);
1468
for(int i = 0; i < numhooks; i++){
1469
direntry = direntries[i];
1470
char *fullname = NULL;
1471
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1472
if(ret < 0){
1473
perror_plus("asprintf");
1474
continue;
1475
}
1476
if(debug){
1477
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1478
direntry->d_name);
1479
}
1480
pid_t hook_pid = fork();
1481
if(hook_pid == 0){
1482
/* Child */
1483
/* Raise privileges */
1484
raise_privileges_permanently();
1485
/* Set group */
1486
errno = 0;
1487
ret = setgid(0);
1488
if(ret == -1){
1489
perror_plus("setgid");
1490
}
1491
/* Reset supplementary groups */
1492
errno = 0;
1493
ret = setgroups(0, NULL);
1494
if(ret == -1){
1495
perror_plus("setgroups");
1496
}
1497
dup2(devnull, STDIN_FILENO);
1498
close(devnull);
1499
dup2(STDERR_FILENO, STDOUT_FILENO);
1500
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1501
if(ret == -1){
1502
perror_plus("setenv");
1503
_exit(EX_OSERR);
1504
}
1505
ret = setenv("DEVICE", interface, 1);
1506
if(ret == -1){
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1511
if(ret == -1){
1512
perror_plus("setenv");
1513
_exit(EX_OSERR);
1514
}
1515
ret = setenv("MODE", mode, 1);
1516
if(ret == -1){
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
char *delaystring;
1521
ret = asprintf(&delaystring, "%f", delay);
1522
if(ret == -1){
1523
perror_plus("asprintf");
1524
_exit(EX_OSERR);
1525
}
1526
ret = setenv("DELAY", delaystring, 1);
1527
if(ret == -1){
1528
free(delaystring);
1529
perror_plus("setenv");
1530
_exit(EX_OSERR);
1531
}
1532
free(delaystring);
1533
if(connect_to != NULL){
1534
ret = setenv("CONNECT", connect_to, 1);
1535
if(ret == -1){
1536
perror_plus("setenv");
1537
_exit(EX_OSERR);
1538
}
1539
}
1540
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1541
perror_plus("execl");
1542
_exit(EXIT_FAILURE);
1543
}
1544
} else {
1545
int status;
1546
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1547
perror_plus("waitpid");
1548
free(fullname);
1549
continue;
1550
}
1551
if(WIFEXITED(status)){
1552
if(WEXITSTATUS(status) != 0){
1553
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1554
" with status %d\n", direntry->d_name,
1555
WEXITSTATUS(status));
1556
free(fullname);
1557
continue;
1558
}
1559
} else if(WIFSIGNALED(status)){
1560
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1561
" signal %d\n", direntry->d_name,
1562
WTERMSIG(status));
1563
free(fullname);
1564
continue;
1565
} else {
1566
fprintf_plus(stderr, "Warning: network hook \"%s\""
1567
" crashed\n", direntry->d_name);
1568
free(fullname);
1569
continue;
1570
}
1571
}
1572
free(fullname);
1573
if(debug){
1574
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1575
direntry->d_name);
1576
}
1577
}
1578
close(devnull);
1579
}
1580
return true;
1581
}
1582
1583
error_t bring_up_interface(const char *const interface,
1584
const float delay){
1585
int sd = -1;
1586
error_t old_errno = errno;
1587
error_t ret_errno = 0;
1588
int ret, ret_setflags;
1589
struct ifreq network;
1590
unsigned int if_index = if_nametoindex(interface);
1591
if(if_index == 0){
1592
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1593
errno = old_errno;
1594
return ENXIO;
1595
}
1596
1597
if(quit_now){
1598
errno = old_errno;
1599
return EINTR;
1600
}
1601
1602
if(not interface_is_up(interface)){
1603
if(not get_flags(interface, &network) and debug){
1604
ret_errno = errno;
1605
fprintf_plus(stderr, "Failed to get flags for interface "
1606
"\"%s\"\n", interface);
1607
return ret_errno;
1608
}
1609
network.ifr_flags |= IFF_UP;
1610
1611
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1612
if(sd < 0){
1613
ret_errno = errno;
1614
perror_plus("socket");
1615
errno = old_errno;
1616
return ret_errno;
1617
}
1618
1619
if(quit_now){
1620
close(sd);
1621
errno = old_errno;
1622
return EINTR;
1623
}
1624
1625
if(debug){
1626
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1627
interface);
1628
}
1629
1630
/* Raise priviliges */
1631
raise_privileges();
1632
1633
#ifdef __linux__
1634
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1635
messages about the network interface to mess up the prompt */
1636
int ret_linux = klogctl(8, NULL, 5);
1637
bool restore_loglevel = true;
1638
if(ret_linux == -1){
1639
restore_loglevel = false;
1640
perror_plus("klogctl");
1641
}
1642
#endif /* __linux__ */
1643
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1644
ret_errno = errno;
1645
#ifdef __linux__
1646
if(restore_loglevel){
1647
ret_linux = klogctl(7, NULL, 0);
1648
if(ret_linux == -1){
1649
perror_plus("klogctl");
1650
}
1651
}
1652
#endif /* __linux__ */
1653
1654
/* Lower privileges */
1655
lower_privileges();
1656
1657
/* Close the socket */
1658
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1659
if(ret == -1){
1660
perror_plus("close");
1661
}
1662
1663
if(ret_setflags == -1){
1664
errno = ret_errno;
1665
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1666
errno = old_errno;
1667
return ret_errno;
1668
}
1669
} else if(debug){
1670
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1671
interface);
1672
}
1673
1674
/* Sleep checking until interface is running.
1675
Check every 0.25s, up to total time of delay */
1676
for(int i=0; i < delay * 4; i++){
1677
if(interface_is_running(interface)){
1678
break;
1679
}
1680
struct timespec sleeptime = { .tv_nsec = 250000000 };
1681
ret = nanosleep(&sleeptime, NULL);
1682
if(ret == -1 and errno != EINTR){
1683
perror_plus("nanosleep");
1684
}
1685
}
1686
1687
errno = old_errno;
1688
return 0;
1689
}
1690
1691
error_t take_down_interface(const char *const interface){
1692
int sd = -1;
1693
error_t old_errno = errno;
1694
error_t ret_errno = 0;
1695
int ret, ret_setflags;
1696
struct ifreq network;
1697
unsigned int if_index = if_nametoindex(interface);
1698
if(if_index == 0){
1699
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1700
errno = old_errno;
1701
return ENXIO;
1702
}
1703
if(interface_is_up(interface)){
1704
if(not get_flags(interface, &network) and debug){
1705
ret_errno = errno;
1706
fprintf_plus(stderr, "Failed to get flags for interface "
1707
"\"%s\"\n", interface);
1708
return ret_errno;
1709
}
1710
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1711
1712
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1713
if(sd < 0){
1714
ret_errno = errno;
1715
perror_plus("socket");
1716
errno = old_errno;
1717
return ret_errno;
1718
}
1719
1720
if(debug){
1721
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1722
interface);
1723
}
1724
1725
/* Raise priviliges */
1726
raise_privileges();
1727
1728
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1729
ret_errno = errno;
1730
1731
/* Lower privileges */
1732
lower_privileges();
1733
1734
/* Close the socket */
1735
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1736
if(ret == -1){
1737
perror_plus("close");
1738
}
1739
1740
if(ret_setflags == -1){
1741
errno = ret_errno;
1742
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1743
errno = old_errno;
1744
return ret_errno;
1745
}
1746
} else if(debug){
1747
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1748
interface);
1749
}
1750
1751
errno = old_errno;
1752
return 0;
1753
}
1754
1755
1120
int main(int argc, char *argv[]){
1756
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1757
.priority = "SECURE256:!CTYPE-X.509:"
1758
"+CTYPE-OPENPGP", .current_server = NULL };
1759
1121
AvahiSServiceBrowser *sb = NULL;
1760
error_t ret_errno;
1122
int error;
1761
1123
int ret;
1762
1124
intmax_t tmpmax;
1763
1125
char *tmp;
1764
1126
int exitcode = EXIT_SUCCESS;
1765
char *interfaces = NULL;
1766
size_t interfaces_size = 0;
1767
char *interfaces_to_take_down = NULL;
1768
size_t interfaces_to_take_down_size = 0;
1127
const char *interface = "";
1128
struct ifreq network;
1129
int sd = -1;
1130
bool take_down_interface = false;
1131
uid_t uid;
1132
gid_t gid;
1769
1133
char tempdir[] = "/tmp/mandosXXXXXX";
1770
1134
bool tempdir_created = false;
1771
1135
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1772
1136
const char *seckey = PATHDIR "/" SECKEY;
1773
1137
const char *pubkey = PATHDIR "/" PUBKEY;
1774
char *interfaces_hooks = NULL;
1775
size_t interfaces_hooks_size = 0;
1776
1138
1777
1139
bool gnutls_initialized = false;
1778
1140
bool gpgme_initialized = false;
1779
1141
float delay = 2.5f;
1780
double retry_interval = 10; /* 10s between trying a server and
1781
retrying the same server again */
1782
1142
1783
1143
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1784
1144
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1790
1150
errno = 0;
1791
1151
ret = setgid(gid);
1792
1152
if(ret == -1){
1793
perror_plus("setgid");
1153
perror("setgid");
1794
1154
}
1795
1155
1796
1156
/* Lower user privileges (temporarily) */
1797
1157
errno = 0;
1798
1158
ret = seteuid(uid);
1799
1159
if(ret == -1){
1800
perror_plus("seteuid");
1160
perror("seteuid");
1801
1161
}
1802
1162
1803
1163
if(quit_now){
1838
1198
.arg = "SECONDS",
1839
1199
.doc = "Maximum delay to wait for interface startup",
1840
1200
.group = 2 },
1841
{ .name = "retry", .key = 132,
1842
.arg = "SECONDS",
1843
.doc = "Retry interval used when denied by the Mandos server",
1844
.group = 2 },
1845
{ .name = "network-hook-dir", .key = 133,
1846
.arg = "DIR",
1847
.doc = "Directory where network hooks are located",
1848
.group = 2 },
1849
1201
/*
1850
1202
* These reproduce what we would get without ARGP_NO_HELP
1851
1203
*/
1869
1221
connect_to = arg;
1870
1222
break;
1871
1223
case 'i': /* --interface */
1872
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1873
(int)',');
1874
if(ret_errno != 0){
1875
argp_error(state, "%s", strerror(ret_errno));
1876
}
1224
interface = arg;
1877
1225
break;
1878
1226
case 's': /* --seckey */
1879
1227
seckey = arg;
1899
1247
if(errno != 0 or tmp == arg or *tmp != '\0'){
1900
1248
argp_error(state, "Bad delay");
1901
1249
}
1902
case 132: /* --retry */
1903
errno = 0;
1904
retry_interval = strtod(arg, &tmp);
1905
if(errno != 0 or tmp == arg or *tmp != '\0'
1906
or (retry_interval * 1000) > INT_MAX
1907
or retry_interval < 0){
1908
argp_error(state, "Bad retry interval");
1909
}
1910
break;
1911
case 133: /* --network-hook-dir */
1912
hookdir = arg;
1913
1250
break;
1914
1251
/*
1915
1252
* These reproduce what we would get without ARGP_NO_HELP
1922
1259
argp_state_help(state, state->out_stream,
1923
1260
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1924
1261
case 'V': /* --version */
1925
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1262
fprintf(state->out_stream, "%s\n", argp_program_version);
1926
1263
exit(argp_err_exit_status);
1927
1264
break;
1928
1265
default:
1943
1280
case ENOMEM:
1944
1281
default:
1945
1282
errno = ret;
1946
perror_plus("argp_parse");
1283
perror("argp_parse");
1947
1284
exitcode = EX_OSERR;
1948
1285
goto end;
1949
1286
case EINVAL:
1951
1288
goto end;
1952
1289
}
1953
1290
}
1954
1955
{
1956
/* Work around Debian bug #633582:
1957
<http://bugs.debian.org/633582> */
1958
1959
/* Re-raise priviliges */
1960
if(raise_privileges() == 0){
1961
struct stat st;
1962
1963
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1964
int seckey_fd = open(seckey, O_RDONLY);
1965
if(seckey_fd == -1){
1966
perror_plus("open");
1967
} else {
1968
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1969
if(ret == -1){
1970
perror_plus("fstat");
1971
} else {
1972
if(S_ISREG(st.st_mode)
1973
and st.st_uid == 0 and st.st_gid == 0){
1974
ret = fchown(seckey_fd, uid, gid);
1975
if(ret == -1){
1976
perror_plus("fchown");
1977
}
1978
}
1979
}
1980
TEMP_FAILURE_RETRY(close(seckey_fd));
1981
}
1982
}
1983
1984
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1985
int pubkey_fd = open(pubkey, O_RDONLY);
1986
if(pubkey_fd == -1){
1987
perror_plus("open");
1988
} else {
1989
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1990
if(ret == -1){
1991
perror_plus("fstat");
1992
} else {
1993
if(S_ISREG(st.st_mode)
1994
and st.st_uid == 0 and st.st_gid == 0){
1995
ret = fchown(pubkey_fd, uid, gid);
1996
if(ret == -1){
1997
perror_plus("fchown");
1998
}
1999
}
2000
}
2001
TEMP_FAILURE_RETRY(close(pubkey_fd));
2002
}
2003
}
2004
2005
/* Lower privileges */
2006
errno = 0;
2007
ret = seteuid(uid);
2008
if(ret == -1){
2009
perror_plus("seteuid");
2010
}
2011
}
2012
}
2013
2014
/* Remove empty interface names */
2015
{
2016
char *interface = NULL;
2017
while((interface = argz_next(interfaces, interfaces_size,
2018
interface))){
2019
if(if_nametoindex(interface) == 0){
2020
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2021
fprintf_plus(stderr, "Not using nonexisting interface"
2022
" \"%s\"\n", interface);
2023
}
2024
argz_delete(&interfaces, &interfaces_size, interface);
2025
interface = NULL;
2026
}
2027
}
2028
}
2029
2030
/* Run network hooks */
2031
{
2032
2033
if(interfaces != NULL){
2034
interfaces_hooks = malloc(interfaces_size);
2035
if(interfaces_hooks == NULL){
2036
perror_plus("malloc");
2037
goto end;
2038
}
2039
memcpy(interfaces_hooks, interfaces, interfaces_size);
2040
interfaces_hooks_size = interfaces_size;
2041
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2042
(int)',');
2043
}
2044
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2045
interfaces_hooks : "", delay)){
2046
goto end;
2047
}
2048
}
2049
1291
2050
1292
if(not debug){
2051
1293
avahi_set_log_function(empty_log);
2052
1294
}
1295
1296
if(interface[0] == '\0'){
1297
struct dirent **direntries;
1298
ret = scandir(sys_class_net, &direntries, good_interface,
1299
alphasort);
1300
if(ret >= 1){
1301
/* Pick the first good interface */
1302
interface = strdup(direntries[0]->d_name);
1303
if(debug){
1304
fprintf(stderr, "Using interface \"%s\"\n", interface);
1305
}
1306
if(interface == NULL){
1307
perror("malloc");
1308
free(direntries);
1309
exitcode = EXIT_FAILURE;
1310
goto end;
1311
}
1312
free(direntries);
1313
} else {
1314
free(direntries);
1315
fprintf(stderr, "Could not find a network interface\n");
1316
exitcode = EXIT_FAILURE;
1317
goto end;
1318
}
1319
}
2053
1320
2054
1321
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2055
1322
from the signal handler */
2056
1323
/* Initialize the pseudo-RNG for Avahi */
2057
1324
srand((unsigned int) time(NULL));
2058
simple_poll = avahi_simple_poll_new();
2059
if(simple_poll == NULL){
2060
fprintf_plus(stderr,
2061
"Avahi: Failed to create simple poll object.\n");
1325
mc.simple_poll = avahi_simple_poll_new();
1326
if(mc.simple_poll == NULL){
1327
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2062
1328
exitcode = EX_UNAVAILABLE;
2063
1329
goto end;
2064
1330
}
2066
1332
sigemptyset(&sigterm_action.sa_mask);
2067
1333
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2068
1334
if(ret == -1){
2069
perror_plus("sigaddset");
1335
perror("sigaddset");
2070
1336
exitcode = EX_OSERR;
2071
1337
goto end;
2072
1338
}
2073
1339
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2074
1340
if(ret == -1){
2075
perror_plus("sigaddset");
1341
perror("sigaddset");
2076
1342
exitcode = EX_OSERR;
2077
1343
goto end;
2078
1344
}
2079
1345
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2080
1346
if(ret == -1){
2081
perror_plus("sigaddset");
1347
perror("sigaddset");
2082
1348
exitcode = EX_OSERR;
2083
1349
goto end;
2084
1350
}
2088
1354
*/
2089
1355
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2090
1356
if(ret == -1){
2091
perror_plus("sigaction");
1357
perror("sigaction");
2092
1358
return EX_OSERR;
2093
1359
}
2094
1360
if(old_sigterm_action.sa_handler != SIG_IGN){
2095
1361
ret = sigaction(SIGINT, &sigterm_action, NULL);
2096
1362
if(ret == -1){
2097
perror_plus("sigaction");
1363
perror("sigaction");
2098
1364
exitcode = EX_OSERR;
2099
1365
goto end;
2100
1366
}
2101
1367
}
2102
1368
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2103
1369
if(ret == -1){
2104
perror_plus("sigaction");
1370
perror("sigaction");
2105
1371
return EX_OSERR;
2106
1372
}
2107
1373
if(old_sigterm_action.sa_handler != SIG_IGN){
2108
1374
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2109
1375
if(ret == -1){
2110
perror_plus("sigaction");
1376
perror("sigaction");
2111
1377
exitcode = EX_OSERR;
2112
1378
goto end;
2113
1379
}
2114
1380
}
2115
1381
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2116
1382
if(ret == -1){
2117
perror_plus("sigaction");
1383
perror("sigaction");
2118
1384
return EX_OSERR;
2119
1385
}
2120
1386
if(old_sigterm_action.sa_handler != SIG_IGN){
2121
1387
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2122
1388
if(ret == -1){
2123
perror_plus("sigaction");
1389
perror("sigaction");
2124
1390
exitcode = EX_OSERR;
2125
1391
goto end;
2126
1392
}
2127
1393
}
2128
1394
2129
/* If no interfaces were specified, make a list */
2130
if(interfaces == NULL){
2131
struct dirent **direntries;
2132
/* Look for any good interfaces */
2133
ret = scandir(sys_class_net, &direntries, good_interface,
2134
alphasort);
2135
if(ret >= 1){
2136
/* Add all found interfaces to interfaces list */
2137
for(int i = 0; i < ret; ++i){
2138
ret_errno = argz_add(&interfaces, &interfaces_size,
2139
direntries[i]->d_name);
2140
if(ret_errno != 0){
2141
perror_plus("argz_add");
2142
continue;
2143
}
2144
if(debug){
2145
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2146
direntries[i]->d_name);
2147
}
2148
}
2149
free(direntries);
1395
/* If the interface is down, bring it up */
1396
if(strcmp(interface, "none") != 0){
1397
if_index = (AvahiIfIndex) if_nametoindex(interface);
1398
if(if_index == 0){
1399
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1400
exitcode = EX_UNAVAILABLE;
1401
goto end;
1402
}
1403
1404
if(quit_now){
1405
goto end;
1406
}
1407
1408
/* Re-raise priviliges */
1409
errno = 0;
1410
ret = seteuid(0);
1411
if(ret == -1){
1412
perror("seteuid");
1413
}
1414
1415
#ifdef __linux__
1416
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1417
messages about the network interface to mess up the prompt */
1418
ret = klogctl(8, NULL, 5);
1419
bool restore_loglevel = true;
1420
if(ret == -1){
1421
restore_loglevel = false;
1422
perror("klogctl");
1423
}
1424
#endif /* __linux__ */
1425
1426
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1427
if(sd < 0){
1428
perror("socket");
1429
exitcode = EX_OSERR;
1430
#ifdef __linux__
1431
if(restore_loglevel){
1432
ret = klogctl(7, NULL, 0);
1433
if(ret == -1){
1434
perror("klogctl");
1435
}
1436
}
1437
#endif /* __linux__ */
1438
/* Lower privileges */
1439
errno = 0;
1440
ret = seteuid(uid);
1441
if(ret == -1){
1442
perror("seteuid");
1443
}
1444
goto end;
1445
}
1446
strcpy(network.ifr_name, interface);
1447
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1448
if(ret == -1){
1449
perror("ioctl SIOCGIFFLAGS");
1450
#ifdef __linux__
1451
if(restore_loglevel){
1452
ret = klogctl(7, NULL, 0);
1453
if(ret == -1){
1454
perror("klogctl");
1455
}
1456
}
1457
#endif /* __linux__ */
1458
exitcode = EX_OSERR;
1459
/* Lower privileges */
1460
errno = 0;
1461
ret = seteuid(uid);
1462
if(ret == -1){
1463
perror("seteuid");
1464
}
1465
goto end;
1466
}
1467
if((network.ifr_flags & IFF_UP) == 0){
1468
network.ifr_flags |= IFF_UP;
1469
take_down_interface = true;
1470
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1471
if(ret == -1){
1472
take_down_interface = false;
1473
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1474
exitcode = EX_OSERR;
1475
#ifdef __linux__
1476
if(restore_loglevel){
1477
ret = klogctl(7, NULL, 0);
1478
if(ret == -1){
1479
perror("klogctl");
1480
}
1481
}
1482
#endif /* __linux__ */
1483
/* Lower privileges */
1484
errno = 0;
1485
ret = seteuid(uid);
1486
if(ret == -1){
1487
perror("seteuid");
1488
}
1489
goto end;
1490
}
1491
}
1492
/* sleep checking until interface is running */
1493
for(int i=0; i < delay * 4; i++){
1494
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1495
if(ret == -1){
1496
perror("ioctl SIOCGIFFLAGS");
1497
} else if(network.ifr_flags & IFF_RUNNING){
1498
break;
1499
}
1500
struct timespec sleeptime = { .tv_nsec = 250000000 };
1501
ret = nanosleep(&sleeptime, NULL);
1502
if(ret == -1 and errno != EINTR){
1503
perror("nanosleep");
1504
}
1505
}
1506
if(not take_down_interface){
1507
/* We won't need the socket anymore */
1508
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1509
if(ret == -1){
1510
perror("close");
1511
}
1512
}
1513
#ifdef __linux__
1514
if(restore_loglevel){
1515
/* Restores kernel loglevel to default */
1516
ret = klogctl(7, NULL, 0);
1517
if(ret == -1){
1518
perror("klogctl");
1519
}
1520
}
1521
#endif /* __linux__ */
1522
/* Lower privileges */
1523
errno = 0;
1524
if(take_down_interface){
1525
/* Lower privileges */
1526
ret = seteuid(uid);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
2150
1530
} else {
2151
free(direntries);
2152
fprintf_plus(stderr, "Could not find a network interface\n");
2153
exitcode = EXIT_FAILURE;
2154
goto end;
2155
}
2156
}
2157
2158
/* If we only got one interface, explicitly use only that one */
2159
if(argz_count(interfaces, interfaces_size) == 1){
2160
if(debug){
2161
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2162
interfaces);
2163
}
2164
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2165
}
2166
2167
/* Bring up interfaces which are down */
2168
if(not (argz_count(interfaces, interfaces_size) == 1
2169
and strcmp(interfaces, "none") == 0)){
2170
char *interface = NULL;
2171
while((interface = argz_next(interfaces, interfaces_size,
2172
interface))){
2173
bool interface_was_up = interface_is_up(interface);
2174
ret = bring_up_interface(interface, delay);
2175
if(not interface_was_up){
2176
if(ret != 0){
2177
errno = ret;
2178
perror_plus("Failed to bring up interface");
2179
} else {
2180
ret_errno = argz_add(&interfaces_to_take_down,
2181
&interfaces_to_take_down_size,
2182
interface);
2183
}
1531
/* Lower privileges permanently */
1532
ret = setuid(uid);
1533
if(ret == -1){
1534
perror("setuid");
2184
1535
}
2185
1536
}
2186
free(interfaces);
2187
interfaces = NULL;
2188
interfaces_size = 0;
2189
if(debug and (interfaces_to_take_down == NULL)){
2190
fprintf_plus(stderr, "No interfaces were brought up\n");
2191
}
2192
1537
}
2193
1538
2194
1539
if(quit_now){
2195
1540
goto end;
2196
1541
}
2197
1542
2198
ret = init_gnutls_global(pubkey, seckey, &mc);
1543
ret = init_gnutls_global(pubkey, seckey);
2199
1544
if(ret == -1){
2200
fprintf_plus(stderr, "init_gnutls_global failed\n");
1545
fprintf(stderr, "init_gnutls_global failed\n");
2201
1546
exitcode = EX_UNAVAILABLE;
2202
1547
goto end;
2203
1548
} else {
2208
1553
goto end;
2209
1554
}
2210
1555
1556
tempdir_created = true;
2211
1557
if(mkdtemp(tempdir) == NULL){
2212
perror_plus("mkdtemp");
1558
tempdir_created = false;
1559
perror("mkdtemp");
2213
1560
goto end;
2214
1561
}
2215
tempdir_created = true;
2216
1562
2217
1563
if(quit_now){
2218
1564
goto end;
2219
1565
}
2220
1566
2221
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2222
fprintf_plus(stderr, "init_gpgme failed\n");
1567
if(not init_gpgme(pubkey, seckey, tempdir)){
1568
fprintf(stderr, "init_gpgme failed\n");
2223
1569
exitcode = EX_UNAVAILABLE;
2224
1570
goto end;
2225
1571
} else {
2234
1580
/* Connect directly, do not use Zeroconf */
2235
1581
/* (Mainly meant for debugging) */
2236
1582
char *address = strrchr(connect_to, ':');
2237
2238
1583
if(address == NULL){
2239
fprintf_plus(stderr, "No colon in address\n");
1584
fprintf(stderr, "No colon in address\n");
2240
1585
exitcode = EX_USAGE;
2241
1586
goto end;
2242
1587
}
2245
1590
goto end;
2246
1591
}
2247
1592
2248
in_port_t port;
1593
uint16_t port;
2249
1594
errno = 0;
2250
1595
tmpmax = strtoimax(address+1, &tmp, 10);
2251
1596
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2252
or tmpmax != (in_port_t)tmpmax){
2253
fprintf_plus(stderr, "Bad port number\n");
1597
or tmpmax != (uint16_t)tmpmax){
1598
fprintf(stderr, "Bad port number\n");
2254
1599
exitcode = EX_USAGE;
2255
1600
goto end;
2256
1601
}
2259
1604
goto end;
2260
1605
}
2261
1606
2262
port = (in_port_t)tmpmax;
1607
port = (uint16_t)tmpmax;
2263
1608
*address = '\0';
1609
address = connect_to;
2264
1610
/* Colon in address indicates IPv6 */
2265
1611
int af;
2266
if(strchr(connect_to, ':') != NULL){
1612
if(strchr(address, ':') != NULL){
2267
1613
af = AF_INET6;
2268
/* Accept [] around IPv6 address - see RFC 5952 */
2269
if(connect_to[0] == '[' and address[-1] == ']')
2270
{
2271
connect_to++;
2272
address[-1] = '\0';
2273
}
2274
1614
} else {
2275
1615
af = AF_INET;
2276
1616
}
2277
address = connect_to;
2278
1617
2279
1618
if(quit_now){
2280
1619
goto end;
2281
1620
}
2282
1621
2283
while(not quit_now){
2284
ret = start_mandos_communication(address, port, if_index, af,
2285
&mc);
2286
if(quit_now or ret == 0){
2287
break;
2288
}
2289
if(debug){
2290
fprintf_plus(stderr, "Retrying in %d seconds\n",
2291
(int)retry_interval);
2292
}
2293
sleep((int)retry_interval);
2294
}
2295
2296
if (not quit_now){
1622
ret = start_mandos_communication(address, port, if_index, af);
1623
if(ret < 0){
1624
switch(errno){
1625
case ENETUNREACH:
1626
case EHOSTDOWN:
1627
case EHOSTUNREACH:
1628
exitcode = EX_NOHOST;
1629
break;
1630
case EINVAL:
1631
exitcode = EX_USAGE;
1632
break;
1633
case EIO:
1634
exitcode = EX_IOERR;
1635
break;
1636
case EPROTO:
1637
exitcode = EX_PROTOCOL;
1638
break;
1639
default:
1640
exitcode = EX_OSERR;
1641
break;
1642
}
1643
} else {
2297
1644
exitcode = EXIT_SUCCESS;
2298
1645
}
2299
2300
1646
goto end;
2301
1647
}
2302
1648
2314
1660
config.publish_domain = 0;
2315
1661
2316
1662
/* Allocate a new server */
2317
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2318
&config, NULL, NULL, &ret_errno);
1663
mc.server = avahi_server_new(avahi_simple_poll_get
1664
(mc.simple_poll), &config, NULL,
1665
NULL, &error);
2319
1666
2320
1667
/* Free the Avahi configuration data */
2321
1668
avahi_server_config_free(&config);
2323
1670
2324
1671
/* Check if creating the Avahi server object succeeded */
2325
1672
if(mc.server == NULL){
2326
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2327
avahi_strerror(ret_errno));
1673
fprintf(stderr, "Failed to create Avahi server: %s\n",
1674
avahi_strerror(error));
2328
1675
exitcode = EX_UNAVAILABLE;
2329
1676
goto end;
2330
1677
}
2336
1683
/* Create the Avahi service browser */
2337
1684
sb = avahi_s_service_browser_new(mc.server, if_index,
2338
1685
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2339
NULL, 0, browse_callback,
2340
(void *)&mc);
1686
NULL, 0, browse_callback, NULL);
2341
1687
if(sb == NULL){
2342
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2343
avahi_strerror(avahi_server_errno(mc.server)));
1688
fprintf(stderr, "Failed to create service browser: %s\n",
1689
avahi_strerror(avahi_server_errno(mc.server)));
2344
1690
exitcode = EX_UNAVAILABLE;
2345
1691
goto end;
2346
1692
}
2352
1698
/* Run the main loop */
2353
1699
2354
1700
if(debug){
2355
fprintf_plus(stderr, "Starting Avahi loop search\n");
2356
}
2357
2358
ret = avahi_loop_with_timeout(simple_poll,
2359
(int)(retry_interval * 1000), &mc);
2360
if(debug){
2361
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2362
(ret == 0) ? "successfully" : "with error");
2363
}
1701
fprintf(stderr, "Starting Avahi loop search\n");
1702
}
1703
1704
avahi_simple_poll_loop(mc.simple_poll);
2364
1705
2365
1706
end:
2366
1707
2367
1708
if(debug){
2368
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1709
fprintf(stderr, "%s exiting\n", argv[0]);
2369
1710
}
2370
1711
2371
1712
/* Cleanup things */
2375
1716
if(mc.server != NULL)
2376
1717
avahi_server_free(mc.server);
2377
1718
2378
if(simple_poll != NULL)
2379
avahi_simple_poll_free(simple_poll);
1719
if(mc.simple_poll != NULL)
1720
avahi_simple_poll_free(mc.simple_poll);
2380
1721
2381
1722
if(gnutls_initialized){
2382
1723
gnutls_certificate_free_credentials(mc.cred);
2388
1729
gpgme_release(mc.ctx);
2389
1730
}
2390
1731
2391
/* Cleans up the circular linked list of Mandos servers the client
2392
has seen */
2393
if(mc.current_server != NULL){
2394
mc.current_server->prev->next = NULL;
2395
while(mc.current_server != NULL){
2396
server *next = mc.current_server->next;
2397
free(mc.current_server);
2398
mc.current_server = next;
1732
/* Take down the network interface */
1733
if(take_down_interface){
1734
/* Re-raise priviliges */
1735
errno = 0;
1736
ret = seteuid(0);
1737
if(ret == -1){
1738
perror("seteuid");
2399
1739
}
2400
}
2401
2402
/* Re-raise priviliges */
2403
{
2404
raise_privileges();
2405
2406
/* Run network hooks */
2407
run_network_hooks("stop", interfaces_hooks != NULL ?
2408
interfaces_hooks : "", delay);
2409
2410
/* Take down the network interfaces which were brought up */
2411
{
2412
char *interface = NULL;
2413
while((interface=argz_next(interfaces_to_take_down,
2414
interfaces_to_take_down_size,
2415
interface))){
2416
ret_errno = take_down_interface(interface);
2417
if(ret_errno != 0){
2418
errno = ret_errno;
2419
perror_plus("Failed to take down interface");
1740
if(geteuid() == 0){
1741
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1742
if(ret == -1){
1743
perror("ioctl SIOCGIFFLAGS");
1744
} else if(network.ifr_flags & IFF_UP) {
1745
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1746
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1747
if(ret == -1){
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
2420
1749
}
2421
1750
}
2422
if(debug and (interfaces_to_take_down == NULL)){
2423
fprintf_plus(stderr, "No interfaces needed to be taken"
2424
" down\n");
1751
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1752
if(ret == -1){
1753
perror("close");
1754
}
1755
/* Lower privileges permanently */
1756
errno = 0;
1757
ret = setuid(uid);
1758
if(ret == -1){
1759
perror("setuid");
2425
1760
}
2426
1761
}
2427
2428
lower_privileges_permanently();
2429
1762
}
2430
1763
2431
free(interfaces_to_take_down);
2432
free(interfaces_hooks);
2433
2434
/* Removes the GPGME temp directory and all files inside */
1764
/* Removes the temp directory used by GPGME */
2435
1765
if(tempdir_created){
2436
struct dirent **direntries = NULL;
2437
struct dirent *direntry = NULL;
2438
int numentries = scandir(tempdir, &direntries, notdotentries,
2439
alphasort);
2440
if (numentries > 0){
2441
for(int i = 0; i < numentries; i++){
2442
direntry = direntries[i];
1766
DIR *d;
1767
struct dirent *direntry;
1768
d = opendir(tempdir);
1769
if(d == NULL){
1770
if(errno != ENOENT){
1771
perror("opendir");
1772
}
1773
} else {
1774
while(true){
1775
direntry = readdir(d);
1776
if(direntry == NULL){
1777
break;
1778
}
1779
/* Skip "." and ".." */
1780
if(direntry->d_name[0] == '.'
1781
and (direntry->d_name[1] == '\0'
1782
or (direntry->d_name[1] == '.'
1783
and direntry->d_name[2] == '\0'))){
1784
continue;
1785
}
2443
1786
char *fullname = NULL;
2444
1787
ret = asprintf(&fullname, "%s/%s", tempdir,
2445
1788
direntry->d_name);
2446
1789
if(ret < 0){
2447
perror_plus("asprintf");
1790
perror("asprintf");
2448
1791
continue;
2449
1792
}
2450
1793
ret = remove(fullname);
2451
1794
if(ret == -1){
2452
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2453
strerror(errno));
1795
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1796
strerror(errno));
2454
1797
}
2455
1798
free(fullname);
2456
1799
}
2457
}
2458
2459
/* need to clean even if 0 because man page doesn't specify */
2460
free(direntries);
2461
if (numentries == -1){
2462
perror_plus("scandir");
1800
closedir(d);
2463
1801
}
2464
1802
ret = rmdir(tempdir);
2465
1803
if(ret == -1 and errno != ENOENT){
2466
perror_plus("rmdir");
1804
perror("rmdir");
2467
1805
}
2468
1806
}
2469
1807
2474
1812
&old_sigterm_action,
2475
1813
NULL));
2476
1814
if(ret == -1){
2477
perror_plus("sigaction");
1815
perror("sigaction");
2478
1816
}
2479
1817
do {
2480
1818
ret = raise(signal_received);
2481
1819
} while(ret != 0 and errno == EINTR);
2482
1820
if(ret != 0){
2483
perror_plus("raise");
1821
perror("raise");
2484
1822
abort();
2485
1823
}
2486
1824
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0