To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 237.7.28
- compare with another revision
- download diff
- download tarball
- view history from revision 237.7.28
- Committer: teddy at bsnet
- Date: 2011-03-21 19:22:27 UTC
- mto: (24.1.171 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 284.
- Revision ID: teddy@fukt.bsnet.se-20110321192227-y74ngvvcy9eq6shi
* plugins.d/mandos-client.c (good_interface): Check if the interface
name starts with "."
before anything else.
Bug fix: Fix memory
leak.
name starts with "."
before anything else.
Bug fix: Fix memory
leak.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
38
#endif
34
39
35
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
41
37
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
43
stdout, ferror(), remove() */
39
44
#include <stdint.h> /* uint16_t, uint32_t */
40
45
#include <stddef.h> /* NULL, size_t, ssize_t */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
44
49
#include <string.h> /* memset(), strcmp(), strlen(),
45
50
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
47
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
53
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
51
56
#include <sys/stat.h> /* open() */
52
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
58
inet_pton(), connect() */
55
59
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
58
64
#include <assert.h> /* assert() */
59
65
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
66
#include <time.h> /* nanosleep(), time(), sleep() */
61
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
62
68
SIOCSIFFLAGS, if_indextoname(),
63
69
if_nametoindex(), IF_NAMESIZE */
64
#include <netinet/in.h>
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
65
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
66
getuid(), getgid(), setuid(),
67
setgid() */
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
68
76
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
77
#include <iso646.h> /* not, or, and */
70
78
#include <argp.h> /* struct argp_option, error_t, struct
71
79
argp_state, struct argp,
72
80
argp_parse(), ARGP_KEY_ARG,
73
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
88
#ifdef __linux__
89
#include <sys/klog.h> /* klogctl() */
90
#endif /* __linux__ */
74
91
75
92
/* Avahi */
76
93
/* All Avahi types, constants and functions
89
106
gnutls_*
90
107
init_gnutls_session(),
91
108
GNUTLS_* */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
109
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
93
111
GNUTLS_OPENPGP_FMT_BASE64 */
94
112
95
113
/* GPGME */
101
119
102
120
#define BUFFER_SIZE 256
103
121
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
108
122
#define PATHDIR "/conf/conf.d/mandos"
109
123
#define SECKEY "seckey.txt"
110
#define PUBKEY "pupkey.txt"
124
#define PUBKEY "pubkey.txt"
111
125
112
126
bool debug = false;
113
127
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "password-request 1.0";
128
const char *argp_program_version = "mandos-client " VERSION;
115
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
130
static const char sys_class_net[] = "/sys/class/net";
131
char *connect_to = NULL;
116
132
117
133
/* Used for passing in values through the Avahi callback functions */
118
134
typedef struct {
125
141
gpgme_ctx_t ctx;
126
142
} mandos_context;
127
143
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" };
148
149
sig_atomic_t quit_now = 0;
150
int signal_received = 0;
151
128
152
/*
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
* bytes. "buffer_capacity" is how much is currently allocated,
131
155
* "buffer_length" is how much is already used.
132
156
*/
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
157
size_t incbuffer(char **buffer, size_t buffer_length,
134
158
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
136
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if (buffer == NULL){
161
if(buffer == NULL){
138
162
return 0;
139
163
}
140
164
buffer_capacity += BUFFER_SIZE;
145
169
/*
146
170
* Initialize GPGME.
147
171
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
172
static bool init_gpgme(const char *seckey,
149
173
const char *pubkey, const char *tempdir){
150
int ret;
151
174
gpgme_error_t rc;
152
175
gpgme_engine_info_t engine_info;
153
176
154
177
155
178
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
179
* Helper function to insert pub and seckey to the engine keyring.
157
180
*/
158
181
bool import_key(const char *filename){
182
int ret;
159
183
int fd;
160
184
gpgme_data_t pgp_data;
161
185
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
187
if(fd == -1){
164
188
perror("open");
165
189
return false;
166
190
}
167
191
168
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
if (rc != GPG_ERR_NO_ERROR){
193
if(rc != GPG_ERR_NO_ERROR){
170
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
195
gpgme_strsource(rc), gpgme_strerror(rc));
172
196
return false;
173
197
}
174
175
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if (rc != GPG_ERR_NO_ERROR){
198
199
rc = gpgme_op_import(mc.ctx, pgp_data);
200
if(rc != GPG_ERR_NO_ERROR){
177
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
202
gpgme_strsource(rc), gpgme_strerror(rc));
179
203
return false;
180
204
}
181
182
ret = TEMP_FAILURE_RETRY(close(fd));
205
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
183
207
if(ret == -1){
184
208
perror("close");
185
209
}
187
211
return true;
188
212
}
189
213
190
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
214
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
192
216
}
193
217
194
218
/* Init GPGME */
195
219
gpgme_check_version(NULL);
196
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
if (rc != GPG_ERR_NO_ERROR){
221
if(rc != GPG_ERR_NO_ERROR){
198
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
223
gpgme_strsource(rc), gpgme_strerror(rc));
200
224
return false;
201
225
}
202
226
203
227
/* Set GPGME home directory for the OpenPGP engine only */
204
rc = gpgme_get_engine_info (&engine_info);
205
if (rc != GPG_ERR_NO_ERROR){
228
rc = gpgme_get_engine_info(&engine_info);
229
if(rc != GPG_ERR_NO_ERROR){
206
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
231
gpgme_strsource(rc), gpgme_strerror(rc));
208
232
return false;
219
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
220
244
return false;
221
245
}
222
246
223
247
/* Create new GPGME "context" */
224
rc = gpgme_new(&(mc->ctx));
225
if (rc != GPG_ERR_NO_ERROR){
248
rc = gpgme_new(&(mc.ctx));
249
if(rc != GPG_ERR_NO_ERROR){
226
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
251
gpgme_strsource(rc), gpgme_strerror(rc));
228
252
return false;
229
253
}
230
254
231
if (not import_key(pubkey) or not import_key(seckey)){
255
if(not import_key(pubkey) or not import_key(seckey)){
232
256
return false;
233
257
}
234
258
235
return true;
259
return true;
236
260
}
237
261
238
262
/*
239
263
* Decrypt OpenPGP data.
240
264
* Returns -1 on error
241
265
*/
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
267
size_t crypto_size,
268
char **plaintext){
246
269
gpgme_data_t dh_crypto, dh_plain;
247
270
gpgme_error_t rc;
248
271
ssize_t ret;
249
272
size_t plaintext_capacity = 0;
250
273
ssize_t plaintext_length = 0;
251
274
252
if (debug){
275
if(debug){
253
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
254
277
}
255
278
256
279
/* Create new GPGME data buffer from memory cryptotext */
257
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
281
0);
259
if (rc != GPG_ERR_NO_ERROR){
282
if(rc != GPG_ERR_NO_ERROR){
260
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
284
gpgme_strsource(rc), gpgme_strerror(rc));
262
285
return -1;
264
287
265
288
/* Create new empty GPGME data buffer for the plaintext */
266
289
rc = gpgme_data_new(&dh_plain);
267
if (rc != GPG_ERR_NO_ERROR){
290
if(rc != GPG_ERR_NO_ERROR){
268
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
292
gpgme_strsource(rc), gpgme_strerror(rc));
270
293
gpgme_data_release(dh_crypto);
273
296
274
297
/* Decrypt data from the cryptotext data buffer to the plaintext
275
298
data buffer */
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if (rc != GPG_ERR_NO_ERROR){
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
300
if(rc != GPG_ERR_NO_ERROR){
278
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
302
gpgme_strsource(rc), gpgme_strerror(rc));
280
303
plaintext_length = -1;
281
if (debug){
304
if(debug){
282
305
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if (result == NULL){
306
result = gpgme_op_decrypt_result(mc.ctx);
307
if(result == NULL){
285
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
309
} else {
287
310
fprintf(stderr, "Unsupported algorithm: %s\n",
293
316
}
294
317
gpgme_recipient_t recipient;
295
318
recipient = result->recipients;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
319
while(recipient != NULL){
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");
326
recipient = recipient->next;
306
327
}
307
328
}
308
329
}
314
335
}
315
336
316
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
318
perror("pgpme_data_seek");
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
339
perror("gpgme_data_seek");
319
340
plaintext_length = -1;
320
341
goto decrypt_end;
321
342
}
322
343
323
344
*plaintext = NULL;
324
345
while(true){
325
plaintext_capacity = adjustbuffer(plaintext,
346
plaintext_capacity = incbuffer(plaintext,
326
347
(size_t)plaintext_length,
327
348
plaintext_capacity);
328
if (plaintext_capacity == 0){
329
perror("adjustbuffer");
349
if(plaintext_capacity == 0){
350
perror("incbuffer");
330
351
plaintext_length = -1;
331
352
goto decrypt_end;
332
353
}
334
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
335
356
BUFFER_SIZE);
336
357
/* Print the data, if any */
337
if (ret == 0){
358
if(ret == 0){
338
359
/* EOF */
339
360
break;
340
361
}
364
385
return plaintext_length;
365
386
}
366
387
367
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
369
if (ret == NULL)
388
static const char * safer_gnutls_strerror(int value){
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
391
if(ret == NULL)
370
392
ret = "(unknown)";
371
393
return ret;
372
394
}
377
399
fprintf(stderr, "GnuTLS: %s", string);
378
400
}
379
401
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
402
static int init_gnutls_global(const char *pubkeyfilename,
382
403
const char *seckeyfilename){
383
404
int ret;
384
405
387
408
}
388
409
389
410
ret = gnutls_global_init();
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
411
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
393
414
return -1;
394
415
}
395
416
396
if (debug){
417
if(debug){
397
418
/* "Use a log level over 10 to enable all debugging options."
398
419
* - GnuTLS manual
399
420
*/
402
423
}
403
424
404
425
/* OpenPGP credentials */
405
gnutls_certificate_allocate_credentials(&mc->cred);
406
if (ret != GNUTLS_E_SUCCESS){
407
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
408
warning */
409
safer_gnutls_strerror(ret));
410
gnutls_global_deinit ();
426
gnutls_certificate_allocate_credentials(&mc.cred);
427
if(ret != GNUTLS_E_SUCCESS){
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
429
from
430
-Wunreachable-code
431
*/
432
safer_gnutls_strerror(ret));
433
gnutls_global_deinit();
411
434
return -1;
412
435
}
413
436
418
441
}
419
442
420
443
ret = gnutls_certificate_set_openpgp_key_file
421
(mc->cred, pubkeyfilename, seckeyfilename,
444
(mc.cred, pubkeyfilename, seckeyfilename,
422
445
GNUTLS_OPENPGP_FMT_BASE64);
423
if (ret != GNUTLS_E_SUCCESS) {
446
if(ret != GNUTLS_E_SUCCESS){
424
447
fprintf(stderr,
425
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
430
453
}
431
454
432
455
/* GnuTLS server initialization */
433
ret = gnutls_dh_params_init(&mc->dh_params);
434
if (ret != GNUTLS_E_SUCCESS) {
435
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
436
" %s\n", safer_gnutls_strerror(ret));
456
ret = gnutls_dh_params_init(&mc.dh_params);
457
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
437
460
goto globalfail;
438
461
}
439
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
440
if (ret != GNUTLS_E_SUCCESS) {
441
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
442
safer_gnutls_strerror(ret));
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
463
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
443
466
goto globalfail;
444
467
}
445
468
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
447
470
448
471
return 0;
449
472
450
473
globalfail:
451
474
452
gnutls_certificate_free_credentials(mc->cred);
475
gnutls_certificate_free_credentials(mc.cred);
453
476
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
454
478
return -1;
455
479
}
456
480
457
static int init_gnutls_session(mandos_context *mc,
458
gnutls_session_t *session){
481
static int init_gnutls_session(gnutls_session_t *session){
459
482
int ret;
460
483
/* GnuTLS session creation */
461
ret = gnutls_init(session, GNUTLS_SERVER);
462
if (ret != GNUTLS_E_SUCCESS){
484
do {
485
ret = gnutls_init(session, GNUTLS_SERVER);
486
if(quit_now){
487
return -1;
488
}
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
if(ret != GNUTLS_E_SUCCESS){
463
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
464
492
safer_gnutls_strerror(ret));
465
493
}
466
494
467
495
{
468
496
const char *err;
469
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
470
if (ret != GNUTLS_E_SUCCESS) {
497
do {
498
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
499
if(quit_now){
500
gnutls_deinit(*session);
501
return -1;
502
}
503
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
504
if(ret != GNUTLS_E_SUCCESS){
471
505
fprintf(stderr, "Syntax error at: %s\n", err);
472
506
fprintf(stderr, "GnuTLS error: %s\n",
473
507
safer_gnutls_strerror(ret));
474
gnutls_deinit (*session);
508
gnutls_deinit(*session);
475
509
return -1;
476
510
}
477
511
}
478
512
479
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
480
mc->cred);
481
if (ret != GNUTLS_E_SUCCESS) {
513
do {
514
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
515
mc.cred);
516
if(quit_now){
517
gnutls_deinit(*session);
518
return -1;
519
}
520
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
521
if(ret != GNUTLS_E_SUCCESS){
482
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
483
523
safer_gnutls_strerror(ret));
484
gnutls_deinit (*session);
524
gnutls_deinit(*session);
485
525
return -1;
486
526
}
487
527
488
528
/* ignore client certificate if any. */
489
gnutls_certificate_server_set_request (*session,
490
GNUTLS_CERT_IGNORE);
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
491
530
492
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
493
532
494
533
return 0;
495
534
}
501
540
/* Called when a Mandos server is found */
502
541
static int start_mandos_communication(const char *ip, uint16_t port,
503
542
AvahiIfIndex if_index,
504
mandos_context *mc){
505
int ret, tcp_sd;
506
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
543
int af){
544
int ret, tcp_sd = -1;
545
ssize_t sret;
546
union {
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
549
} to;
507
550
char *buffer = NULL;
508
char *decrypted_buffer;
551
char *decrypted_buffer = NULL;
509
552
size_t buffer_length = 0;
510
553
size_t buffer_capacity = 0;
511
ssize_t decrypted_buffer_size;
512
554
size_t written;
513
int retval = 0;
514
char interface[IF_NAMESIZE];
555
int retval = -1;
515
556
gnutls_session_t session;
516
517
ret = init_gnutls_session (mc, &session);
518
if (ret != 0){
557
int pf; /* Protocol family */
558
559
errno = 0;
560
561
if(quit_now){
562
errno = EINTR;
563
return -1;
564
}
565
566
switch(af){
567
case AF_INET6:
568
pf = PF_INET6;
569
break;
570
case AF_INET:
571
pf = PF_INET;
572
break;
573
default:
574
fprintf(stderr, "Bad address family: %d\n", af);
575
errno = EINVAL;
576
return -1;
577
}
578
579
ret = init_gnutls_session(&session);
580
if(ret != 0){
519
581
return -1;
520
582
}
521
583
522
584
if(debug){
523
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
524
586
"\n", ip, port);
525
587
}
526
588
527
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
528
if(tcp_sd < 0) {
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
if(tcp_sd < 0){
591
int e = errno;
529
592
perror("socket");
530
return -1;
593
errno = e;
594
goto mandos_end;
531
595
}
532
596
533
if(debug){
534
if(if_indextoname((unsigned int)if_index, interface) == NULL){
535
perror("if_indextoname");
536
return -1;
537
}
538
fprintf(stderr, "Binding to interface %s\n", interface);
597
if(quit_now){
598
errno = EINTR;
599
goto mandos_end;
539
600
}
540
601
541
602
memset(&to, 0, sizeof(to));
542
to.in6.sin6_family = AF_INET6;
543
/* It would be nice to have a way to detect if we were passed an
544
IPv4 address here. Now we assume an IPv6 address. */
545
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
546
if (ret < 0 ){
603
if(af == AF_INET6){
604
to.in6.sin6_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in6.sin6_addr);
606
} else { /* IPv4 */
607
to.in.sin_family = (sa_family_t)af;
608
ret = inet_pton(af, ip, &to.in.sin_addr);
609
}
610
if(ret < 0 ){
611
int e = errno;
547
612
perror("inet_pton");
548
return -1;
613
errno = e;
614
goto mandos_end;
549
615
}
550
616
if(ret == 0){
617
int e = errno;
551
618
fprintf(stderr, "Bad address: %s\n", ip);
552
return -1;
553
}
554
to.in6.sin6_port = htons(port); /* Spurious warning */
619
errno = e;
620
goto mandos_end;
621
}
622
if(af == AF_INET6){
623
to.in6.sin6_port = htons(port); /* Spurious warnings from
624
-Wconversion and
625
-Wunreachable-code */
626
627
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
628
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
629
-Wunreachable-code*/
630
if(if_index == AVAHI_IF_UNSPEC){
631
fprintf(stderr, "An IPv6 link-local address is incomplete"
632
" without a network interface\n");
633
errno = EINVAL;
634
goto mandos_end;
635
}
636
/* Set the network interface number as scope */
637
to.in6.sin6_scope_id = (uint32_t)if_index;
638
}
639
} else {
640
to.in.sin_port = htons(port); /* Spurious warnings from
641
-Wconversion and
642
-Wunreachable-code */
643
}
555
644
556
to.in6.sin6_scope_id = (uint32_t)if_index;
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
557
649
558
650
if(debug){
559
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
560
port);
561
char addrstr[INET6_ADDRSTRLEN] = "";
562
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
563
sizeof(addrstr)) == NULL){
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
652
char interface[IF_NAMESIZE];
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
654
perror("if_indextoname");
655
} else {
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
658
}
659
} else {
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
port);
662
}
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
665
const char *pcret;
666
if(af == AF_INET6){
667
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
668
sizeof(addrstr));
669
} else {
670
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
671
sizeof(addrstr));
672
}
673
if(pcret == NULL){
564
674
perror("inet_ntop");
565
675
} else {
566
676
if(strcmp(addrstr, ip) != 0){
569
679
}
570
680
}
571
681
572
ret = connect(tcp_sd, &to.in, sizeof(to));
573
if (ret < 0){
574
perror("connect");
575
return -1;
682
if(quit_now){
683
errno = EINTR;
684
goto mandos_end;
685
}
686
687
if(af == AF_INET6){
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
689
} else {
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
691
}
692
if(ret < 0){
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
694
int e = errno;
695
perror("connect");
696
errno = e;
697
}
698
goto mandos_end;
699
}
700
701
if(quit_now){
702
errno = EINTR;
703
goto mandos_end;
576
704
}
577
705
578
706
const char *out = mandos_protocol_version;
579
707
written = 0;
580
while (true){
708
while(true){
581
709
size_t out_size = strlen(out);
582
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
583
711
out_size - written));
584
if (ret == -1){
712
if(ret == -1){
713
int e = errno;
585
714
perror("write");
586
retval = -1;
715
errno = e;
587
716
goto mandos_end;
588
717
}
589
718
written += (size_t)ret;
590
719
if(written < out_size){
591
720
continue;
592
721
} else {
593
if (out == mandos_protocol_version){
722
if(out == mandos_protocol_version){
594
723
written = 0;
595
724
out = "\r\n";
596
725
} else {
597
726
break;
598
727
}
599
728
}
729
730
if(quit_now){
731
errno = EINTR;
732
goto mandos_end;
733
}
600
734
}
601
735
602
736
if(debug){
603
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
604
738
}
605
739
606
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
607
608
do{
609
ret = gnutls_handshake (session);
740
if(quit_now){
741
errno = EINTR;
742
goto mandos_end;
743
}
744
745
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
746
747
if(quit_now){
748
errno = EINTR;
749
goto mandos_end;
750
}
751
752
do {
753
ret = gnutls_handshake(session);
754
if(quit_now){
755
errno = EINTR;
756
goto mandos_end;
757
}
610
758
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
611
759
612
if (ret != GNUTLS_E_SUCCESS){
760
if(ret != GNUTLS_E_SUCCESS){
613
761
if(debug){
614
762
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
615
gnutls_perror (ret);
763
gnutls_perror(ret);
616
764
}
617
retval = -1;
765
errno = EPROTO;
618
766
goto mandos_end;
619
767
}
620
768
621
769
/* Read OpenPGP packet that contains the wanted password */
622
770
623
771
if(debug){
624
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
625
773
ip);
626
774
}
627
775
628
776
while(true){
629
buffer_capacity = adjustbuffer(&buffer, buffer_length,
777
778
if(quit_now){
779
errno = EINTR;
780
goto mandos_end;
781
}
782
783
buffer_capacity = incbuffer(&buffer, buffer_length,
630
784
buffer_capacity);
631
if (buffer_capacity == 0){
632
perror("adjustbuffer");
633
retval = -1;
634
goto mandos_end;
635
}
636
637
ret = gnutls_record_recv(session, buffer+buffer_length,
638
BUFFER_SIZE);
639
if (ret == 0){
785
if(buffer_capacity == 0){
786
int e = errno;
787
perror("incbuffer");
788
errno = e;
789
goto mandos_end;
790
}
791
792
if(quit_now){
793
errno = EINTR;
794
goto mandos_end;
795
}
796
797
sret = gnutls_record_recv(session, buffer+buffer_length,
798
BUFFER_SIZE);
799
if(sret == 0){
640
800
break;
641
801
}
642
if (ret < 0){
643
switch(ret){
802
if(sret < 0){
803
switch(sret){
644
804
case GNUTLS_E_INTERRUPTED:
645
805
case GNUTLS_E_AGAIN:
646
806
break;
647
807
case GNUTLS_E_REHANDSHAKE:
648
do{
649
ret = gnutls_handshake (session);
808
do {
809
ret = gnutls_handshake(session);
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
650
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
651
if (ret < 0){
816
if(ret < 0){
652
817
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
653
gnutls_perror (ret);
654
retval = -1;
818
gnutls_perror(ret);
819
errno = EPROTO;
655
820
goto mandos_end;
656
821
}
657
822
break;
658
823
default:
659
824
fprintf(stderr, "Unknown error while reading data from"
660
825
" encrypted session with Mandos server\n");
661
retval = -1;
662
gnutls_bye (session, GNUTLS_SHUT_RDWR);
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
errno = EIO;
663
828
goto mandos_end;
664
829
}
665
830
} else {
666
buffer_length += (size_t) ret;
831
buffer_length += (size_t) sret;
667
832
}
668
833
}
669
834
671
836
fprintf(stderr, "Closing TLS session\n");
672
837
}
673
838
674
gnutls_bye (session, GNUTLS_SHUT_RDWR);
675
676
if (buffer_length > 0){
677
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
839
if(quit_now){
840
errno = EINTR;
841
goto mandos_end;
842
}
843
844
do {
845
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
846
if(quit_now){
847
errno = EINTR;
848
goto mandos_end;
849
}
850
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
851
852
if(buffer_length > 0){
853
ssize_t decrypted_buffer_size;
854
decrypted_buffer_size = pgp_packet_decrypt(buffer,
678
855
buffer_length,
679
856
&decrypted_buffer);
680
if (decrypted_buffer_size >= 0){
857
if(decrypted_buffer_size >= 0){
858
681
859
written = 0;
682
860
while(written < (size_t) decrypted_buffer_size){
683
ret = (int)fwrite (decrypted_buffer + written, 1,
684
(size_t)decrypted_buffer_size - written,
685
stdout);
861
if(quit_now){
862
errno = EINTR;
863
goto mandos_end;
864
}
865
866
ret = (int)fwrite(decrypted_buffer + written, 1,
867
(size_t)decrypted_buffer_size - written,
868
stdout);
686
869
if(ret == 0 and ferror(stdout)){
870
int e = errno;
687
871
if(debug){
688
872
fprintf(stderr, "Error writing encrypted data: %s\n",
689
873
strerror(errno));
690
874
}
691
retval = -1;
692
break;
875
errno = e;
876
goto mandos_end;
693
877
}
694
878
written += (size_t)ret;
695
879
}
696
free(decrypted_buffer);
697
} else {
698
retval = -1;
880
retval = 0;
699
881
}
700
} else {
701
retval = -1;
702
882
}
703
883
704
884
/* Shutdown procedure */
705
885
706
886
mandos_end:
707
free(buffer);
708
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
709
if(ret == -1){
710
perror("close");
887
{
888
int e = errno;
889
free(decrypted_buffer);
890
free(buffer);
891
if(tcp_sd >= 0){
892
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
893
}
894
if(ret == -1){
895
if(e == 0){
896
e = errno;
897
}
898
perror("close");
899
}
900
gnutls_deinit(session);
901
if(quit_now){
902
e = EINTR;
903
retval = -1;
904
}
905
errno = e;
711
906
}
712
gnutls_deinit (session);
713
907
return retval;
714
908
}
715
909
716
910
static void resolve_callback(AvahiSServiceResolver *r,
717
911
AvahiIfIndex interface,
718
AVAHI_GCC_UNUSED AvahiProtocol protocol,
912
AvahiProtocol proto,
719
913
AvahiResolverEvent event,
720
914
const char *name,
721
915
const char *type,
726
920
AVAHI_GCC_UNUSED AvahiStringList *txt,
727
921
AVAHI_GCC_UNUSED AvahiLookupResultFlags
728
922
flags,
729
void* userdata) {
730
mandos_context *mc = userdata;
923
AVAHI_GCC_UNUSED void* userdata){
731
924
assert(r);
732
925
733
926
/* Called whenever a service has been resolved successfully or
734
927
timed out */
735
928
736
switch (event) {
929
if(quit_now){
930
return;
931
}
932
933
switch(event){
737
934
default:
738
935
case AVAHI_RESOLVER_FAILURE:
739
936
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
740
937
" of type '%s' in domain '%s': %s\n", name, type, domain,
741
avahi_strerror(avahi_server_errno(mc->server)));
938
avahi_strerror(avahi_server_errno(mc.server)));
742
939
break;
743
940
744
941
case AVAHI_RESOLVER_FOUND:
747
944
avahi_address_snprint(ip, sizeof(ip), address);
748
945
if(debug){
749
946
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
750
PRIu16 ") on port %d\n", name, host_name, ip,
751
interface, port);
947
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
948
ip, (intmax_t)interface, port);
752
949
}
753
int ret = start_mandos_communication(ip, port, interface, mc);
754
if (ret == 0){
755
avahi_simple_poll_quit(mc->simple_poll);
950
int ret = start_mandos_communication(ip, port, interface,
951
avahi_proto_to_af(proto));
952
if(ret == 0){
953
avahi_simple_poll_quit(mc.simple_poll);
756
954
}
757
955
}
758
956
}
759
957
avahi_s_service_resolver_free(r);
760
958
}
761
959
762
static void browse_callback( AvahiSServiceBrowser *b,
763
AvahiIfIndex interface,
764
AvahiProtocol protocol,
765
AvahiBrowserEvent event,
766
const char *name,
767
const char *type,
768
const char *domain,
769
AVAHI_GCC_UNUSED AvahiLookupResultFlags
770
flags,
771
void* userdata) {
772
mandos_context *mc = userdata;
960
static void browse_callback(AvahiSServiceBrowser *b,
961
AvahiIfIndex interface,
962
AvahiProtocol protocol,
963
AvahiBrowserEvent event,
964
const char *name,
965
const char *type,
966
const char *domain,
967
AVAHI_GCC_UNUSED AvahiLookupResultFlags
968
flags,
969
AVAHI_GCC_UNUSED void* userdata){
773
970
assert(b);
774
971
775
972
/* Called whenever a new services becomes available on the LAN or
776
973
is removed from the LAN */
777
974
778
switch (event) {
975
if(quit_now){
976
return;
977
}
978
979
switch(event){
779
980
default:
780
981
case AVAHI_BROWSER_FAILURE:
781
982
782
983
fprintf(stderr, "(Avahi browser) %s\n",
783
avahi_strerror(avahi_server_errno(mc->server)));
784
avahi_simple_poll_quit(mc->simple_poll);
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
785
986
return;
786
987
787
988
case AVAHI_BROWSER_NEW:
790
991
the callback function is called the Avahi server will free the
791
992
resolver for us. */
792
993
793
if (!(avahi_s_service_resolver_new(mc->server, interface,
794
protocol, name, type, domain,
795
AVAHI_PROTO_INET6, 0,
796
resolve_callback, mc)))
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
797
997
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
798
name, avahi_strerror(avahi_server_errno(mc->server)));
998
name, avahi_strerror(avahi_server_errno(mc.server)));
799
999
break;
800
1000
801
1001
case AVAHI_BROWSER_REMOVE:
810
1010
}
811
1011
}
812
1012
1013
/* stop main loop after sigterm has been called */
1014
static void handle_sigterm(int sig){
1015
if(quit_now){
1016
return;
1017
}
1018
quit_now = 1;
1019
signal_received = sig;
1020
int old_errno = errno;
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1023
}
1024
errno = old_errno;
1025
}
1026
1027
/*
1028
* This function determines if a directory entry in /sys/class/net
1029
* corresponds to an acceptable network device.
1030
* (This function is passed to scandir(3) as a filter function.)
1031
*/
1032
int good_interface(const struct dirent *if_entry){
1033
ssize_t ssret;
1034
char *flagname = NULL;
1035
if(if_entry->d_name[0] == '.'){
1036
return 0;
1037
}
1038
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1039
if_entry->d_name);
1040
if(ret < 0){
1041
perror("asprintf");
1042
return 0;
1043
}
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1045
if(flags_fd == -1){
1046
perror("open");
1047
free(flagname);
1048
return 0;
1049
}
1050
free(flagname);
1051
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1052
/* read line from flags_fd */
1053
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1054
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1055
flagstring[(size_t)to_read] = '\0';
1056
if(flagstring == NULL){
1057
perror("malloc");
1058
close(flags_fd);
1059
return 0;
1060
}
1061
while(to_read > 0){
1062
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1063
(size_t)to_read));
1064
if(ssret == -1){
1065
perror("read");
1066
free(flagstring);
1067
close(flags_fd);
1068
return 0;
1069
}
1070
to_read -= ssret;
1071
if(ssret == 0){
1072
break;
1073
}
1074
}
1075
close(flags_fd);
1076
intmax_t tmpmax;
1077
char *tmp;
1078
errno = 0;
1079
tmpmax = strtoimax(flagstring, &tmp, 0);
1080
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1081
and not (isspace(*tmp)))
1082
or tmpmax != (ifreq_flags)tmpmax){
1083
if(debug){
1084
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1085
flagstring, if_entry->d_name);
1086
}
1087
free(flagstring);
1088
return 0;
1089
}
1090
free(flagstring);
1091
ifreq_flags flags = (ifreq_flags)tmpmax;
1092
/* Reject the loopback device */
1093
if(flags & IFF_LOOPBACK){
1094
if(debug){
1095
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1096
if_entry->d_name);
1097
}
1098
return 0;
1099
}
1100
/* Accept point-to-point devices only if connect_to is specified */
1101
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1102
if(debug){
1103
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1104
if_entry->d_name);
1105
}
1106
return 1;
1107
}
1108
/* Otherwise, reject non-broadcast-capable devices */
1109
if(not (flags & IFF_BROADCAST)){
1110
if(debug){
1111
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1112
if_entry->d_name);
1113
}
1114
return 0;
1115
}
1116
/* Accept this device */
1117
if(debug){
1118
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1119
if_entry->d_name);
1120
}
1121
return 1;
1122
}
1123
813
1124
int main(int argc, char *argv[]){
814
AvahiSServiceBrowser *sb = NULL;
815
int error;
816
int ret;
817
int exitcode = EXIT_SUCCESS;
818
const char *interface = "eth0";
819
struct ifreq network;
820
int sd;
821
uid_t uid;
822
gid_t gid;
823
char *connect_to = NULL;
824
char tempdir[] = "/tmp/mandosXXXXXX";
825
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
826
const char *seckey = PATHDIR "/" SECKEY;
827
const char *pubkey = PATHDIR "/" PUBKEY;
828
829
mandos_context mc = { .simple_poll = NULL, .server = NULL,
830
.dh_bits = 1024, .priority = "SECURE256"
831
":!CTYPE-X.509:+CTYPE-OPENPGP" };
832
bool gnutls_initalized = false;
833
bool pgpme_initalized = false;
834
835
{
836
struct argp_option options[] = {
837
{ .name = "debug", .key = 128,
838
.doc = "Debug mode", .group = 3 },
839
{ .name = "connect", .key = 'c',
840
.arg = "ADDRESS:PORT",
841
.doc = "Connect directly to a specific Mandos server",
842
.group = 1 },
843
{ .name = "interface", .key = 'i',
844
.arg = "NAME",
845
.doc = "Interface that will be used to search for Mandos"
846
" servers",
847
.group = 1 },
848
{ .name = "seckey", .key = 's',
849
.arg = "FILE",
850
.doc = "OpenPGP secret key file base name",
851
.group = 1 },
852
{ .name = "pubkey", .key = 'p',
853
.arg = "FILE",
854
.doc = "OpenPGP public key file base name",
855
.group = 2 },
856
{ .name = "dh-bits", .key = 129,
857
.arg = "BITS",
858
.doc = "Bit length of the prime number used in the"
859
" Diffie-Hellman key exchange",
860
.group = 2 },
861
{ .name = "priority", .key = 130,
862
.arg = "STRING",
863
.doc = "GnuTLS priority string for the TLS handshake",
864
.group = 1 },
865
{ .name = NULL }
866
};
867
868
error_t parse_opt (int key, char *arg,
869
struct argp_state *state) {
870
/* Get the INPUT argument from `argp_parse', which we know is
871
a pointer to our plugin list pointer. */
872
switch (key) {
873
case 128: /* --debug */
874
debug = true;
875
break;
876
case 'c': /* --connect */
877
connect_to = arg;
878
break;
879
case 'i': /* --interface */
880
interface = arg;
881
break;
882
case 's': /* --seckey */
883
seckey = arg;
884
break;
885
case 'p': /* --pubkey */
886
pubkey = arg;
887
break;
888
case 129: /* --dh-bits */
889
errno = 0;
890
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
891
if (errno){
892
perror("strtol");
893
exit(EXIT_FAILURE);
894
}
895
break;
896
case 130: /* --priority */
897
mc.priority = arg;
898
break;
899
case ARGP_KEY_ARG:
900
argp_usage (state);
901
case ARGP_KEY_END:
902
break;
903
default:
904
return ARGP_ERR_UNKNOWN;
905
}
906
return 0;
907
}
908
909
struct argp argp = { .options = options, .parser = parse_opt,
910
.args_doc = "",
911
.doc = "Mandos client -- Get and decrypt"
912
" passwords from a Mandos server" };
913
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
914
if (ret == ARGP_ERR_UNKNOWN){
915
fprintf(stderr, "Unknown error while parsing arguments\n");
916
exitcode = EXIT_FAILURE;
917
goto end;
918
}
919
}
920
921
ret = init_gnutls_global(&mc, pubkey, seckey);
922
if (ret == -1){
923
fprintf(stderr, "init_gnutls_global failed\n");
924
exitcode = EXIT_FAILURE;
925
goto end;
926
} else {
927
gnutls_initalized = true;
928
}
1125
AvahiSServiceBrowser *sb = NULL;
1126
int error;
1127
int ret;
1128
intmax_t tmpmax;
1129
char *tmp;
1130
int exitcode = EXIT_SUCCESS;
1131
const char *interface = "";
1132
struct ifreq network;
1133
int sd = -1;
1134
bool take_down_interface = false;
1135
uid_t uid;
1136
gid_t gid;
1137
char tempdir[] = "/tmp/mandosXXXXXX";
1138
bool tempdir_created = false;
1139
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1140
const char *seckey = PATHDIR "/" SECKEY;
1141
const char *pubkey = PATHDIR "/" PUBKEY;
1142
1143
bool gnutls_initialized = false;
1144
bool gpgme_initialized = false;
1145
float delay = 2.5f;
1146
1147
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1148
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1149
1150
uid = getuid();
1151
gid = getgid();
1152
1153
/* Lower any group privileges we might have, just to be safe */
1154
errno = 0;
1155
ret = setgid(gid);
1156
if(ret == -1){
1157
perror("setgid");
1158
}
1159
1160
/* Lower user privileges (temporarily) */
1161
errno = 0;
1162
ret = seteuid(uid);
1163
if(ret == -1){
1164
perror("seteuid");
1165
}
1166
1167
if(quit_now){
1168
goto end;
1169
}
1170
1171
{
1172
struct argp_option options[] = {
1173
{ .name = "debug", .key = 128,
1174
.doc = "Debug mode", .group = 3 },
1175
{ .name = "connect", .key = 'c',
1176
.arg = "ADDRESS:PORT",
1177
.doc = "Connect directly to a specific Mandos server",
1178
.group = 1 },
1179
{ .name = "interface", .key = 'i',
1180
.arg = "NAME",
1181
.doc = "Network interface that will be used to search for"
1182
" Mandos servers",
1183
.group = 1 },
1184
{ .name = "seckey", .key = 's',
1185
.arg = "FILE",
1186
.doc = "OpenPGP secret key file base name",
1187
.group = 1 },
1188
{ .name = "pubkey", .key = 'p',
1189
.arg = "FILE",
1190
.doc = "OpenPGP public key file base name",
1191
.group = 2 },
1192
{ .name = "dh-bits", .key = 129,
1193
.arg = "BITS",
1194
.doc = "Bit length of the prime number used in the"
1195
" Diffie-Hellman key exchange",
1196
.group = 2 },
1197
{ .name = "priority", .key = 130,
1198
.arg = "STRING",
1199
.doc = "GnuTLS priority string for the TLS handshake",
1200
.group = 1 },
1201
{ .name = "delay", .key = 131,
1202
.arg = "SECONDS",
1203
.doc = "Maximum delay to wait for interface startup",
1204
.group = 2 },
1205
/*
1206
* These reproduce what we would get without ARGP_NO_HELP
1207
*/
1208
{ .name = "help", .key = '?',
1209
.doc = "Give this help list", .group = -1 },
1210
{ .name = "usage", .key = -3,
1211
.doc = "Give a short usage message", .group = -1 },
1212
{ .name = "version", .key = 'V',
1213
.doc = "Print program version", .group = -1 },
1214
{ .name = NULL }
1215
};
1216
1217
error_t parse_opt(int key, char *arg,
1218
struct argp_state *state){
1219
errno = 0;
1220
switch(key){
1221
case 128: /* --debug */
1222
debug = true;
1223
break;
1224
case 'c': /* --connect */
1225
connect_to = arg;
1226
break;
1227
case 'i': /* --interface */
1228
interface = arg;
1229
break;
1230
case 's': /* --seckey */
1231
seckey = arg;
1232
break;
1233
case 'p': /* --pubkey */
1234
pubkey = arg;
1235
break;
1236
case 129: /* --dh-bits */
1237
errno = 0;
1238
tmpmax = strtoimax(arg, &tmp, 10);
1239
if(errno != 0 or tmp == arg or *tmp != '\0'
1240
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1241
argp_error(state, "Bad number of DH bits");
1242
}
1243
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1244
break;
1245
case 130: /* --priority */
1246
mc.priority = arg;
1247
break;
1248
case 131: /* --delay */
1249
errno = 0;
1250
delay = strtof(arg, &tmp);
1251
if(errno != 0 or tmp == arg or *tmp != '\0'){
1252
argp_error(state, "Bad delay");
1253
}
1254
break;
1255
/*
1256
* These reproduce what we would get without ARGP_NO_HELP
1257
*/
1258
case '?': /* --help */
1259
argp_state_help(state, state->out_stream,
1260
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1261
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1262
case -3: /* --usage */
1263
argp_state_help(state, state->out_stream,
1264
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1265
case 'V': /* --version */
1266
fprintf(state->out_stream, "%s\n", argp_program_version);
1267
exit(argp_err_exit_status);
1268
break;
1269
default:
1270
return ARGP_ERR_UNKNOWN;
1271
}
1272
return errno;
1273
}
1274
1275
struct argp argp = { .options = options, .parser = parse_opt,
1276
.args_doc = "",
1277
.doc = "Mandos client -- Get and decrypt"
1278
" passwords from a Mandos server" };
1279
ret = argp_parse(&argp, argc, argv,
1280
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1281
switch(ret){
1282
case 0:
1283
break;
1284
case ENOMEM:
1285
default:
1286
errno = ret;
1287
perror("argp_parse");
1288
exitcode = EX_OSERR;
1289
goto end;
1290
case EINVAL:
1291
exitcode = EX_USAGE;
1292
goto end;
1293
}
1294
}
1295
1296
if(not debug){
1297
avahi_set_log_function(empty_log);
1298
}
929
1299
930
if(mkdtemp(tempdir) == NULL){
931
perror("mkdtemp");
932
tempdir[0] = '\0';
933
goto end;
934
}
935
936
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
937
fprintf(stderr, "pgpme_initalized failed\n");
1300
if(interface[0] == '\0'){
1301
struct dirent **direntries;
1302
ret = scandir(sys_class_net, &direntries, good_interface,
1303
alphasort);
1304
if(ret >= 1){
1305
/* Pick the first good interface */
1306
interface = strdup(direntries[0]->d_name);
1307
if(debug){
1308
fprintf(stderr, "Using interface \"%s\"\n", interface);
1309
}
1310
if(interface == NULL){
1311
perror("malloc");
1312
free(direntries);
1313
exitcode = EXIT_FAILURE;
1314
goto end;
1315
}
1316
free(direntries);
1317
} else {
1318
free(direntries);
1319
fprintf(stderr, "Could not find a network interface\n");
938
1320
exitcode = EXIT_FAILURE;
939
1321
goto end;
940
} else {
941
pgpme_initalized = true;
942
}
943
944
/* If the interface is down, bring it up */
945
{
946
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
947
if(sd < 0) {
948
perror("socket");
949
exitcode = EXIT_FAILURE;
950
goto end;
951
}
952
strcpy(network.ifr_name, interface);
953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
954
if(ret == -1){
955
perror("ioctl SIOCGIFFLAGS");
956
exitcode = EXIT_FAILURE;
957
goto end;
958
}
959
if((network.ifr_flags & IFF_UP) == 0){
960
network.ifr_flags |= IFF_UP;
961
ret = ioctl(sd, SIOCSIFFLAGS, &network);
962
if(ret == -1){
963
perror("ioctl SIOCSIFFLAGS");
964
exitcode = EXIT_FAILURE;
965
goto end;
966
}
967
}
968
ret = TEMP_FAILURE_RETRY(close(sd));
969
if(ret == -1){
970
perror("close");
971
}
972
}
973
974
uid = getuid();
975
gid = getgid();
976
977
ret = setuid(uid);
978
if (ret == -1){
979
perror("setuid");
980
}
981
982
setgid(gid);
983
if (ret == -1){
984
perror("setgid");
985
}
986
1322
}
1323
}
1324
1325
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1326
from the signal handler */
1327
/* Initialize the pseudo-RNG for Avahi */
1328
srand((unsigned int) time(NULL));
1329
mc.simple_poll = avahi_simple_poll_new();
1330
if(mc.simple_poll == NULL){
1331
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1332
exitcode = EX_UNAVAILABLE;
1333
goto end;
1334
}
1335
1336
sigemptyset(&sigterm_action.sa_mask);
1337
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1338
if(ret == -1){
1339
perror("sigaddset");
1340
exitcode = EX_OSERR;
1341
goto end;
1342
}
1343
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1344
if(ret == -1){
1345
perror("sigaddset");
1346
exitcode = EX_OSERR;
1347
goto end;
1348
}
1349
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1350
if(ret == -1){
1351
perror("sigaddset");
1352
exitcode = EX_OSERR;
1353
goto end;
1354
}
1355
/* Need to check if the handler is SIG_IGN before handling:
1356
| [[info:libc:Initial Signal Actions]] |
1357
| [[info:libc:Basic Signal Handling]] |
1358
*/
1359
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1360
if(ret == -1){
1361
perror("sigaction");
1362
return EX_OSERR;
1363
}
1364
if(old_sigterm_action.sa_handler != SIG_IGN){
1365
ret = sigaction(SIGINT, &sigterm_action, NULL);
1366
if(ret == -1){
1367
perror("sigaction");
1368
exitcode = EX_OSERR;
1369
goto end;
1370
}
1371
}
1372
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1373
if(ret == -1){
1374
perror("sigaction");
1375
return EX_OSERR;
1376
}
1377
if(old_sigterm_action.sa_handler != SIG_IGN){
1378
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1379
if(ret == -1){
1380
perror("sigaction");
1381
exitcode = EX_OSERR;
1382
goto end;
1383
}
1384
}
1385
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1386
if(ret == -1){
1387
perror("sigaction");
1388
return EX_OSERR;
1389
}
1390
if(old_sigterm_action.sa_handler != SIG_IGN){
1391
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1392
if(ret == -1){
1393
perror("sigaction");
1394
exitcode = EX_OSERR;
1395
goto end;
1396
}
1397
}
1398
1399
/* If the interface is down, bring it up */
1400
if(strcmp(interface, "none") != 0){
987
1401
if_index = (AvahiIfIndex) if_nametoindex(interface);
988
1402
if(if_index == 0){
989
1403
fprintf(stderr, "No such interface: \"%s\"\n", interface);
990
exit(EXIT_FAILURE);
991
}
992
993
if(connect_to != NULL){
994
/* Connect directly, do not use Zeroconf */
995
/* (Mainly meant for debugging) */
996
char *address = strrchr(connect_to, ':');
997
if(address == NULL){
998
fprintf(stderr, "No colon in address\n");
999
exitcode = EXIT_FAILURE;
1000
goto end;
1001
}
1002
errno = 0;
1003
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1004
if(errno){
1005
perror("Bad port number");
1006
exitcode = EXIT_FAILURE;
1007
goto end;
1008
}
1009
*address = '\0';
1010
address = connect_to;
1011
ret = start_mandos_communication(address, port, if_index, &mc);
1012
if(ret < 0){
1013
exitcode = EXIT_FAILURE;
1014
} else {
1015
exitcode = EXIT_SUCCESS;
1016
}
1017
goto end;
1018
}
1019
1020
if (not debug){
1021
avahi_set_log_function(empty_log);
1022
}
1023
1024
/* Initialize the pseudo-RNG for Avahi */
1025
srand((unsigned int) time(NULL));
1026
1027
/* Allocate main Avahi loop object */
1028
mc.simple_poll = avahi_simple_poll_new();
1029
if (mc.simple_poll == NULL) {
1030
fprintf(stderr, "Avahi: Failed to create simple poll"
1031
" object.\n");
1032
exitcode = EXIT_FAILURE;
1033
goto end;
1034
}
1035
1036
{
1037
AvahiServerConfig config;
1038
/* Do not publish any local Zeroconf records */
1039
avahi_server_config_init(&config);
1040
config.publish_hinfo = 0;
1041
config.publish_addresses = 0;
1042
config.publish_workstation = 0;
1043
config.publish_domain = 0;
1044
1045
/* Allocate a new server */
1046
mc.server = avahi_server_new(avahi_simple_poll_get
1047
(mc.simple_poll), &config, NULL,
1048
NULL, &error);
1049
1050
/* Free the Avahi configuration data */
1051
avahi_server_config_free(&config);
1052
}
1053
1054
/* Check if creating the Avahi server object succeeded */
1055
if (mc.server == NULL) {
1056
fprintf(stderr, "Failed to create Avahi server: %s\n",
1057
avahi_strerror(error));
1058
exitcode = EXIT_FAILURE;
1059
goto end;
1060
}
1061
1062
/* Create the Avahi service browser */
1063
sb = avahi_s_service_browser_new(mc.server, if_index,
1064
AVAHI_PROTO_INET6,
1065
"_mandos._tcp", NULL, 0,
1066
browse_callback, &mc);
1067
if (sb == NULL) {
1068
fprintf(stderr, "Failed to create service browser: %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
exitcode = EXIT_FAILURE;
1071
goto end;
1072
}
1073
1074
/* Run the main loop */
1075
1076
if (debug){
1077
fprintf(stderr, "Starting Avahi loop search\n");
1078
}
1079
1080
avahi_simple_poll_loop(mc.simple_poll);
1081
1404
exitcode = EX_UNAVAILABLE;
1405
goto end;
1406
}
1407
1408
if(quit_now){
1409
goto end;
1410
}
1411
1412
/* Re-raise priviliges */
1413
errno = 0;
1414
ret = seteuid(0);
1415
if(ret == -1){
1416
perror("seteuid");
1417
}
1418
1419
#ifdef __linux__
1420
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1421
messages about the network interface to mess up the prompt */
1422
ret = klogctl(8, NULL, 5);
1423
bool restore_loglevel = true;
1424
if(ret == -1){
1425
restore_loglevel = false;
1426
perror("klogctl");
1427
}
1428
#endif /* __linux__ */
1429
1430
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1431
if(sd < 0){
1432
perror("socket");
1433
exitcode = EX_OSERR;
1434
#ifdef __linux__
1435
if(restore_loglevel){
1436
ret = klogctl(7, NULL, 0);
1437
if(ret == -1){
1438
perror("klogctl");
1439
}
1440
}
1441
#endif /* __linux__ */
1442
/* Lower privileges */
1443
errno = 0;
1444
ret = seteuid(uid);
1445
if(ret == -1){
1446
perror("seteuid");
1447
}
1448
goto end;
1449
}
1450
strcpy(network.ifr_name, interface);
1451
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1452
if(ret == -1){
1453
perror("ioctl SIOCGIFFLAGS");
1454
#ifdef __linux__
1455
if(restore_loglevel){
1456
ret = klogctl(7, NULL, 0);
1457
if(ret == -1){
1458
perror("klogctl");
1459
}
1460
}
1461
#endif /* __linux__ */
1462
exitcode = EX_OSERR;
1463
/* Lower privileges */
1464
errno = 0;
1465
ret = seteuid(uid);
1466
if(ret == -1){
1467
perror("seteuid");
1468
}
1469
goto end;
1470
}
1471
if((network.ifr_flags & IFF_UP) == 0){
1472
network.ifr_flags |= IFF_UP;
1473
take_down_interface = true;
1474
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1475
if(ret == -1){
1476
take_down_interface = false;
1477
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1478
exitcode = EX_OSERR;
1479
#ifdef __linux__
1480
if(restore_loglevel){
1481
ret = klogctl(7, NULL, 0);
1482
if(ret == -1){
1483
perror("klogctl");
1484
}
1485
}
1486
#endif /* __linux__ */
1487
/* Lower privileges */
1488
errno = 0;
1489
ret = seteuid(uid);
1490
if(ret == -1){
1491
perror("seteuid");
1492
}
1493
goto end;
1494
}
1495
}
1496
/* sleep checking until interface is running */
1497
for(int i=0; i < delay * 4; i++){
1498
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1499
if(ret == -1){
1500
perror("ioctl SIOCGIFFLAGS");
1501
} else if(network.ifr_flags & IFF_RUNNING){
1502
break;
1503
}
1504
struct timespec sleeptime = { .tv_nsec = 250000000 };
1505
ret = nanosleep(&sleeptime, NULL);
1506
if(ret == -1 and errno != EINTR){
1507
perror("nanosleep");
1508
}
1509
}
1510
if(not take_down_interface){
1511
/* We won't need the socket anymore */
1512
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1513
if(ret == -1){
1514
perror("close");
1515
}
1516
}
1517
#ifdef __linux__
1518
if(restore_loglevel){
1519
/* Restores kernel loglevel to default */
1520
ret = klogctl(7, NULL, 0);
1521
if(ret == -1){
1522
perror("klogctl");
1523
}
1524
}
1525
#endif /* __linux__ */
1526
/* Lower privileges */
1527
errno = 0;
1528
if(take_down_interface){
1529
/* Lower privileges */
1530
ret = seteuid(uid);
1531
if(ret == -1){
1532
perror("seteuid");
1533
}
1534
} else {
1535
/* Lower privileges permanently */
1536
ret = setuid(uid);
1537
if(ret == -1){
1538
perror("setuid");
1539
}
1540
}
1541
}
1542
1543
if(quit_now){
1544
goto end;
1545
}
1546
1547
ret = init_gnutls_global(pubkey, seckey);
1548
if(ret == -1){
1549
fprintf(stderr, "init_gnutls_global failed\n");
1550
exitcode = EX_UNAVAILABLE;
1551
goto end;
1552
} else {
1553
gnutls_initialized = true;
1554
}
1555
1556
if(quit_now){
1557
goto end;
1558
}
1559
1560
tempdir_created = true;
1561
if(mkdtemp(tempdir) == NULL){
1562
tempdir_created = false;
1563
perror("mkdtemp");
1564
goto end;
1565
}
1566
1567
if(quit_now){
1568
goto end;
1569
}
1570
1571
if(not init_gpgme(pubkey, seckey, tempdir)){
1572
fprintf(stderr, "init_gpgme failed\n");
1573
exitcode = EX_UNAVAILABLE;
1574
goto end;
1575
} else {
1576
gpgme_initialized = true;
1577
}
1578
1579
if(quit_now){
1580
goto end;
1581
}
1582
1583
if(connect_to != NULL){
1584
/* Connect directly, do not use Zeroconf */
1585
/* (Mainly meant for debugging) */
1586
char *address = strrchr(connect_to, ':');
1587
if(address == NULL){
1588
fprintf(stderr, "No colon in address\n");
1589
exitcode = EX_USAGE;
1590
goto end;
1591
}
1592
1593
if(quit_now){
1594
goto end;
1595
}
1596
1597
uint16_t port;
1598
errno = 0;
1599
tmpmax = strtoimax(address+1, &tmp, 10);
1600
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1601
or tmpmax != (uint16_t)tmpmax){
1602
fprintf(stderr, "Bad port number\n");
1603
exitcode = EX_USAGE;
1604
goto end;
1605
}
1606
1607
if(quit_now){
1608
goto end;
1609
}
1610
1611
port = (uint16_t)tmpmax;
1612
*address = '\0';
1613
address = connect_to;
1614
/* Colon in address indicates IPv6 */
1615
int af;
1616
if(strchr(address, ':') != NULL){
1617
af = AF_INET6;
1618
} else {
1619
af = AF_INET;
1620
}
1621
1622
if(quit_now){
1623
goto end;
1624
}
1625
1626
while(not quit_now){
1627
ret = start_mandos_communication(address, port, if_index, af);
1628
if(quit_now or ret == 0){
1629
break;
1630
}
1631
sleep(15);
1632
};
1633
1634
if (not quit_now){
1635
exitcode = EXIT_SUCCESS;
1636
}
1637
1638
goto end;
1639
}
1640
1641
if(quit_now){
1642
goto end;
1643
}
1644
1645
{
1646
AvahiServerConfig config;
1647
/* Do not publish any local Zeroconf records */
1648
avahi_server_config_init(&config);
1649
config.publish_hinfo = 0;
1650
config.publish_addresses = 0;
1651
config.publish_workstation = 0;
1652
config.publish_domain = 0;
1653
1654
/* Allocate a new server */
1655
mc.server = avahi_server_new(avahi_simple_poll_get
1656
(mc.simple_poll), &config, NULL,
1657
NULL, &error);
1658
1659
/* Free the Avahi configuration data */
1660
avahi_server_config_free(&config);
1661
}
1662
1663
/* Check if creating the Avahi server object succeeded */
1664
if(mc.server == NULL){
1665
fprintf(stderr, "Failed to create Avahi server: %s\n",
1666
avahi_strerror(error));
1667
exitcode = EX_UNAVAILABLE;
1668
goto end;
1669
}
1670
1671
if(quit_now){
1672
goto end;
1673
}
1674
1675
/* Create the Avahi service browser */
1676
sb = avahi_s_service_browser_new(mc.server, if_index,
1677
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1678
NULL, 0, browse_callback, NULL);
1679
if(sb == NULL){
1680
fprintf(stderr, "Failed to create service browser: %s\n",
1681
avahi_strerror(avahi_server_errno(mc.server)));
1682
exitcode = EX_UNAVAILABLE;
1683
goto end;
1684
}
1685
1686
if(quit_now){
1687
goto end;
1688
}
1689
1690
/* Run the main loop */
1691
1692
if(debug){
1693
fprintf(stderr, "Starting Avahi loop search\n");
1694
}
1695
1696
avahi_simple_poll_loop(mc.simple_poll);
1697
1082
1698
end:
1083
1084
if (debug){
1085
fprintf(stderr, "%s exiting\n", argv[0]);
1086
}
1087
1088
/* Cleanup things */
1089
if (sb != NULL)
1090
avahi_s_service_browser_free(sb);
1091
1092
if (mc.server != NULL)
1093
avahi_server_free(mc.server);
1094
1095
if (mc.simple_poll != NULL)
1096
avahi_simple_poll_free(mc.simple_poll);
1097
1098
if (gnutls_initalized){
1099
gnutls_certificate_free_credentials(mc.cred);
1100
gnutls_global_deinit ();
1101
}
1102
1103
if(pgpme_initalized){
1104
gpgme_release(mc.ctx);
1105
}
1106
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1109
DIR *d;
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1112
if(d == NULL){
1699
1700
if(debug){
1701
fprintf(stderr, "%s exiting\n", argv[0]);
1702
}
1703
1704
/* Cleanup things */
1705
if(sb != NULL)
1706
avahi_s_service_browser_free(sb);
1707
1708
if(mc.server != NULL)
1709
avahi_server_free(mc.server);
1710
1711
if(mc.simple_poll != NULL)
1712
avahi_simple_poll_free(mc.simple_poll);
1713
1714
if(gnutls_initialized){
1715
gnutls_certificate_free_credentials(mc.cred);
1716
gnutls_global_deinit();
1717
gnutls_dh_params_deinit(mc.dh_params);
1718
}
1719
1720
if(gpgme_initialized){
1721
gpgme_release(mc.ctx);
1722
}
1723
1724
/* Take down the network interface */
1725
if(take_down_interface){
1726
/* Re-raise priviliges */
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror("seteuid");
1731
}
1732
if(geteuid() == 0){
1733
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1734
if(ret == -1){
1735
perror("ioctl SIOCGIFFLAGS");
1736
} else if(network.ifr_flags & IFF_UP) {
1737
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1738
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1739
if(ret == -1){
1740
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1741
}
1742
}
1743
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1744
if(ret == -1){
1745
perror("close");
1746
}
1747
/* Lower privileges permanently */
1748
errno = 0;
1749
ret = setuid(uid);
1750
if(ret == -1){
1751
perror("setuid");
1752
}
1753
}
1754
}
1755
1756
/* Removes the temp directory used by GPGME */
1757
if(tempdir_created){
1758
DIR *d;
1759
struct dirent *direntry;
1760
d = opendir(tempdir);
1761
if(d == NULL){
1762
if(errno != ENOENT){
1113
1763
perror("opendir");
1114
} else {
1115
while(true){
1116
direntry = readdir(d);
1117
if(direntry == NULL){
1118
break;
1119
}
1120
if (direntry->d_type == DT_REG){
1121
char *fullname = NULL;
1122
ret = asprintf(&fullname, "%s/%s", tempdir,
1123
direntry->d_name);
1124
if(ret < 0){
1125
perror("asprintf");
1126
continue;
1127
}
1128
ret = unlink(fullname);
1129
if(ret == -1){
1130
fprintf(stderr, "unlink(\"%s\"): %s",
1131
fullname, strerror(errno));
1132
}
1133
free(fullname);
1134
}
1135
}
1136
}
1137
ret = rmdir(tempdir);
1138
if(ret == -1){
1139
perror("rmdir");
1140
}
1141
}
1142
1143
return exitcode;
1764
}
1765
} else {
1766
while(true){
1767
direntry = readdir(d);
1768
if(direntry == NULL){
1769
break;
1770
}
1771
/* Skip "." and ".." */
1772
if(direntry->d_name[0] == '.'
1773
and (direntry->d_name[1] == '\0'
1774
or (direntry->d_name[1] == '.'
1775
and direntry->d_name[2] == '\0'))){
1776
continue;
1777
}
1778
char *fullname = NULL;
1779
ret = asprintf(&fullname, "%s/%s", tempdir,
1780
direntry->d_name);
1781
if(ret < 0){
1782
perror("asprintf");
1783
continue;
1784
}
1785
ret = remove(fullname);
1786
if(ret == -1){
1787
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1788
strerror(errno));
1789
}
1790
free(fullname);
1791
}
1792
closedir(d);
1793
}
1794
ret = rmdir(tempdir);
1795
if(ret == -1 and errno != ENOENT){
1796
perror("rmdir");
1797
}
1798
}
1799
1800
if(quit_now){
1801
sigemptyset(&old_sigterm_action.sa_mask);
1802
old_sigterm_action.sa_handler = SIG_DFL;
1803
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1804
&old_sigterm_action,
1805
NULL));
1806
if(ret == -1){
1807
perror("sigaction");
1808
}
1809
do {
1810
ret = raise(signal_received);
1811
} while(ret != 0 and errno == EINTR);
1812
if(ret != 0){
1813
perror("raise");
1814
abort();
1815
}
1816
TEMP_FAILURE_RETRY(pause());
1817
}
1818
1819
return exitcode;
1144
1820
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0