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- Committer: Teddy Hogeborn
- Date: 2008-09-19 00:00:51 UTC
- Revision ID: teddy@fukt.bsnet.se-20080919000051-tgm5erxuj0zhs867
* debian/mandos-client.README.Debian: Document "eth0" default and how
to change it.
* debian/mandos-client.postrm (update_initramfs): Use "type" instead
of "which".
* plugin-runner.c (handle_sigchld, print_out_password): Declared
static.
* plugin-runner.xml (SYNOPSIS, OPTIONS): Changed "VAR" to "ENV" in the
"--global-env" option to be
consistent with the
"--env-for" option.
to change it.
* debian/mandos-client.postrm (update_initramfs): Use "type" instead
of "which".
* plugin-runner.c (handle_sigchld, print_out_password): Declared
static.
* plugin-runner.xml (SYNOPSIS, OPTIONS): Changed "VAR" to "ENV" in the
"--global-env" option to be
consistent with the
"--env-for" option.
- files added:
- etc-plugins.d-README
- files removed:
- DBUS-API
- debian/po
- debian/source
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif
39
34
40
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
36
42
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
38
stdout, ferror() */
44
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
45
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
46
#include <sys/ioctl.h> /* ioctl */
52
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
48
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
56
51
#include <sys/stat.h> /* open() */
57
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
53
struct in6_addr, inet_pton(),
54
connect() */
59
55
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
64
58
#include <assert.h> /* assert() */
65
59
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time(), sleep() */
60
#include <time.h> /* time() */
67
61
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
62
SIOCSIFFLAGS, if_indextoname(),
69
63
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
64
#include <netinet/in.h>
73
65
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
66
getuid(), getgid(), setuid(),
67
setgid() */
76
68
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
69
#include <iso646.h> /* not, and */
78
70
#include <argp.h> /* struct argp_option, error_t, struct
79
71
argp_state, struct argp,
80
72
argp_parse(), ARGP_KEY_ARG,
81
73
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__ */
91
74
92
75
/* Avahi */
93
76
/* All Avahi types, constants and functions
106
89
gnutls_*
107
90
init_gnutls_session(),
108
91
GNUTLS_* */
109
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
111
93
GNUTLS_OPENPGP_FMT_BASE64 */
112
94
113
95
/* GPGME */
119
101
120
102
#define BUFFER_SIZE 256
121
103
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
122
108
#define PATHDIR "/conf/conf.d/mandos"
123
109
#define SECKEY "seckey.txt"
124
110
#define PUBKEY "pubkey.txt"
125
111
126
112
bool debug = false;
127
113
static const char mandos_protocol_version[] = "1";
128
const char *argp_program_version = "mandos-client " VERSION;
114
const char *argp_program_version = "mandos-client 1.0";
129
115
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;
132
116
133
117
/* Used for passing in values through the Avahi callback functions */
134
118
typedef struct {
141
125
gpgme_ctx_t ctx;
142
126
} mandos_context;
143
127
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
152
128
/*
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
154
* bytes. "buffer_capacity" is how much is currently allocated,
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
155
131
* "buffer_length" is how much is already used.
156
132
*/
157
size_t incbuffer(char **buffer, size_t buffer_length,
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
158
134
size_t buffer_capacity){
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
160
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
if(buffer == NULL){
137
if (buffer == NULL){
162
138
return 0;
163
139
}
164
140
buffer_capacity += BUFFER_SIZE;
169
145
/*
170
146
* Initialize GPGME.
171
147
*/
172
static bool init_gpgme(const char *seckey,
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
173
149
const char *pubkey, const char *tempdir){
150
int ret;
174
151
gpgme_error_t rc;
175
152
gpgme_engine_info_t engine_info;
176
153
177
154
178
155
/*
179
* Helper function to insert pub and seckey to the engine keyring.
156
* Helper function to insert pub and seckey to the enigne keyring.
180
157
*/
181
158
bool import_key(const char *filename){
182
int ret;
183
159
int fd;
184
160
gpgme_data_t pgp_data;
185
161
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
187
163
if(fd == -1){
188
164
perror("open");
189
165
return false;
190
166
}
191
167
192
168
rc = gpgme_data_new_from_fd(&pgp_data, fd);
193
if(rc != GPG_ERR_NO_ERROR){
169
if (rc != GPG_ERR_NO_ERROR){
194
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
171
gpgme_strsource(rc), gpgme_strerror(rc));
196
172
return false;
197
173
}
198
174
199
rc = gpgme_op_import(mc.ctx, pgp_data);
200
if(rc != GPG_ERR_NO_ERROR){
175
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if (rc != GPG_ERR_NO_ERROR){
201
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
178
gpgme_strsource(rc), gpgme_strerror(rc));
203
179
return false;
204
180
}
205
181
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
182
ret = TEMP_FAILURE_RETRY(close(fd));
207
183
if(ret == -1){
208
184
perror("close");
209
185
}
211
187
return true;
212
188
}
213
189
214
if(debug){
215
fprintf(stderr, "Initializing GPGME\n");
190
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
216
192
}
217
193
218
194
/* Init GPGME */
219
195
gpgme_check_version(NULL);
220
196
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
221
if(rc != GPG_ERR_NO_ERROR){
197
if (rc != GPG_ERR_NO_ERROR){
222
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
199
gpgme_strsource(rc), gpgme_strerror(rc));
224
200
return false;
225
201
}
226
202
227
203
/* Set GPGME home directory for the OpenPGP engine only */
228
rc = gpgme_get_engine_info(&engine_info);
229
if(rc != GPG_ERR_NO_ERROR){
204
rc = gpgme_get_engine_info (&engine_info);
205
if (rc != GPG_ERR_NO_ERROR){
230
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
207
gpgme_strsource(rc), gpgme_strerror(rc));
232
208
return false;
245
221
}
246
222
247
223
/* Create new GPGME "context" */
248
rc = gpgme_new(&(mc.ctx));
249
if(rc != GPG_ERR_NO_ERROR){
224
rc = gpgme_new(&(mc->ctx));
225
if (rc != GPG_ERR_NO_ERROR){
250
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
227
gpgme_strsource(rc), gpgme_strerror(rc));
252
228
return false;
253
229
}
254
230
255
if(not import_key(pubkey) or not import_key(seckey)){
231
if (not import_key(pubkey) or not import_key(seckey)){
256
232
return false;
257
233
}
258
234
259
return true;
235
return true;
260
236
}
261
237
262
238
/*
263
239
* Decrypt OpenPGP data.
264
240
* Returns -1 on error
265
241
*/
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
267
size_t crypto_size,
268
char **plaintext){
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
269
246
gpgme_data_t dh_crypto, dh_plain;
270
247
gpgme_error_t rc;
271
248
ssize_t ret;
272
249
size_t plaintext_capacity = 0;
273
250
ssize_t plaintext_length = 0;
274
251
275
if(debug){
252
if (debug){
276
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
277
254
}
278
255
279
256
/* Create new GPGME data buffer from memory cryptotext */
280
257
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
281
258
0);
282
if(rc != GPG_ERR_NO_ERROR){
259
if (rc != GPG_ERR_NO_ERROR){
283
260
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
261
gpgme_strsource(rc), gpgme_strerror(rc));
285
262
return -1;
287
264
288
265
/* Create new empty GPGME data buffer for the plaintext */
289
266
rc = gpgme_data_new(&dh_plain);
290
if(rc != GPG_ERR_NO_ERROR){
267
if (rc != GPG_ERR_NO_ERROR){
291
268
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
269
gpgme_strsource(rc), gpgme_strerror(rc));
293
270
gpgme_data_release(dh_crypto);
296
273
297
274
/* Decrypt data from the cryptotext data buffer to the plaintext
298
275
data buffer */
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
300
if(rc != GPG_ERR_NO_ERROR){
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if (rc != GPG_ERR_NO_ERROR){
301
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
279
gpgme_strsource(rc), gpgme_strerror(rc));
303
280
plaintext_length = -1;
304
if(debug){
281
if (debug){
305
282
gpgme_decrypt_result_t result;
306
result = gpgme_op_decrypt_result(mc.ctx);
307
if(result == NULL){
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if (result == NULL){
308
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
309
286
} else {
310
287
fprintf(stderr, "Unsupported algorithm: %s\n",
316
293
}
317
294
gpgme_recipient_t recipient;
318
295
recipient = result->recipients;
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;
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
}
327
306
}
328
307
}
329
308
}
335
314
}
336
315
337
316
/* Seek back to the beginning of the GPGME plaintext data buffer */
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
339
318
perror("gpgme_data_seek");
340
319
plaintext_length = -1;
341
320
goto decrypt_end;
343
322
344
323
*plaintext = NULL;
345
324
while(true){
346
plaintext_capacity = incbuffer(plaintext,
325
plaintext_capacity = adjustbuffer(plaintext,
347
326
(size_t)plaintext_length,
348
327
plaintext_capacity);
349
if(plaintext_capacity == 0){
350
perror("incbuffer");
328
if (plaintext_capacity == 0){
329
perror("adjustbuffer");
351
330
plaintext_length = -1;
352
331
goto decrypt_end;
353
332
}
355
334
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
356
335
BUFFER_SIZE);
357
336
/* Print the data, if any */
358
if(ret == 0){
337
if (ret == 0){
359
338
/* EOF */
360
339
break;
361
340
}
385
364
return plaintext_length;
386
365
}
387
366
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)
367
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
369
if (ret == NULL)
392
370
ret = "(unknown)";
393
371
return ret;
394
372
}
399
377
fprintf(stderr, "GnuTLS: %s", string);
400
378
}
401
379
402
static int init_gnutls_global(const char *pubkeyfilename,
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
403
382
const char *seckeyfilename){
404
383
int ret;
405
384
408
387
}
409
388
410
389
ret = gnutls_global_init();
411
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
414
393
return -1;
415
394
}
416
395
417
if(debug){
396
if (debug){
418
397
/* "Use a log level over 10 to enable all debugging options."
419
398
* - GnuTLS manual
420
399
*/
423
402
}
424
403
425
404
/* OpenPGP credentials */
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();
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 ();
434
411
return -1;
435
412
}
436
413
441
418
}
442
419
443
420
ret = gnutls_certificate_set_openpgp_key_file
444
(mc.cred, pubkeyfilename, seckeyfilename,
421
(mc->cred, pubkeyfilename, seckeyfilename,
445
422
GNUTLS_OPENPGP_FMT_BASE64);
446
if(ret != GNUTLS_E_SUCCESS){
423
if (ret != GNUTLS_E_SUCCESS) {
447
424
fprintf(stderr,
448
425
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
453
430
}
454
431
455
432
/* GnuTLS server initialization */
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));
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));
460
437
goto globalfail;
461
438
}
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));
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));
466
443
goto globalfail;
467
444
}
468
445
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
470
447
471
448
return 0;
472
449
473
450
globalfail:
474
451
475
gnutls_certificate_free_credentials(mc.cred);
452
gnutls_certificate_free_credentials(mc->cred);
476
453
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
454
gnutls_dh_params_deinit(mc->dh_params);
478
455
return -1;
479
456
}
480
457
481
static int init_gnutls_session(gnutls_session_t *session){
458
static int init_gnutls_session(mandos_context *mc,
459
gnutls_session_t *session){
482
460
int ret;
483
461
/* GnuTLS session creation */
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){
462
ret = gnutls_init(session, GNUTLS_SERVER);
463
if (ret != GNUTLS_E_SUCCESS){
491
464
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
492
465
safer_gnutls_strerror(ret));
493
466
}
494
467
495
468
{
496
469
const char *err;
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){
470
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
471
if (ret != GNUTLS_E_SUCCESS) {
505
472
fprintf(stderr, "Syntax error at: %s\n", err);
506
473
fprintf(stderr, "GnuTLS error: %s\n",
507
474
safer_gnutls_strerror(ret));
508
gnutls_deinit(*session);
475
gnutls_deinit (*session);
509
476
return -1;
510
477
}
511
478
}
512
479
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){
480
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
481
mc->cred);
482
if (ret != GNUTLS_E_SUCCESS) {
522
483
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
523
484
safer_gnutls_strerror(ret));
524
gnutls_deinit(*session);
485
gnutls_deinit (*session);
525
486
return -1;
526
487
}
527
488
528
489
/* ignore client certificate if any. */
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
490
gnutls_certificate_server_set_request (*session,
491
GNUTLS_CERT_IGNORE);
530
492
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
493
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
532
494
533
495
return 0;
534
496
}
540
502
/* Called when a Mandos server is found */
541
503
static int start_mandos_communication(const char *ip, uint16_t port,
542
504
AvahiIfIndex if_index,
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;
505
mandos_context *mc){
506
int ret, tcp_sd;
507
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
550
508
char *buffer = NULL;
551
char *decrypted_buffer = NULL;
509
char *decrypted_buffer;
552
510
size_t buffer_length = 0;
553
511
size_t buffer_capacity = 0;
512
ssize_t decrypted_buffer_size;
554
513
size_t written;
555
int retval = -1;
514
int retval = 0;
515
char interface[IF_NAMESIZE];
556
516
gnutls_session_t session;
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){
517
518
ret = init_gnutls_session (mc, &session);
519
if (ret != 0){
581
520
return -1;
582
521
}
583
522
584
523
if(debug){
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
524
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
586
525
"\n", ip, port);
587
526
}
588
527
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
if(tcp_sd < 0){
591
int e = errno;
528
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
529
if(tcp_sd < 0) {
592
530
perror("socket");
593
errno = e;
594
goto mandos_end;
531
return -1;
595
532
}
596
533
597
if(quit_now){
598
errno = EINTR;
599
goto mandos_end;
534
if(debug){
535
if(if_indextoname((unsigned int)if_index, interface) == NULL){
536
perror("if_indextoname");
537
return -1;
538
}
539
fprintf(stderr, "Binding to interface %s\n", interface);
600
540
}
601
541
602
542
memset(&to, 0, sizeof(to));
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;
543
to.in6.sin6_family = AF_INET6;
544
/* It would be nice to have a way to detect if we were passed an
545
IPv4 address here. Now we assume an IPv6 address. */
546
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
547
if (ret < 0 ){
612
548
perror("inet_pton");
613
errno = e;
614
goto mandos_end;
549
return -1;
615
550
}
616
551
if(ret == 0){
617
int e = errno;
618
552
fprintf(stderr, "Bad address: %s\n", ip);
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
}
553
return -1;
554
}
555
to.in6.sin6_port = htons(port); /* Spurious warning */
644
556
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
557
to.in6.sin6_scope_id = (uint32_t)if_index;
649
558
650
559
if(debug){
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){
560
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
561
port);
562
char addrstr[INET6_ADDRSTRLEN] = "";
563
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
564
sizeof(addrstr)) == NULL){
674
565
perror("inet_ntop");
675
566
} else {
676
567
if(strcmp(addrstr, ip) != 0){
679
570
}
680
571
}
681
572
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;
573
ret = connect(tcp_sd, &to.in, sizeof(to));
574
if (ret < 0){
575
perror("connect");
576
return -1;
704
577
}
705
578
706
579
const char *out = mandos_protocol_version;
707
580
written = 0;
708
while(true){
581
while (true){
709
582
size_t out_size = strlen(out);
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
583
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
711
584
out_size - written));
712
if(ret == -1){
713
int e = errno;
585
if (ret == -1){
714
586
perror("write");
715
errno = e;
587
retval = -1;
716
588
goto mandos_end;
717
589
}
718
590
written += (size_t)ret;
719
591
if(written < out_size){
720
592
continue;
721
593
} else {
722
if(out == mandos_protocol_version){
594
if (out == mandos_protocol_version){
723
595
written = 0;
724
596
out = "\r\n";
725
597
} else {
726
598
break;
727
599
}
728
600
}
729
730
if(quit_now){
731
errno = EINTR;
732
goto mandos_end;
733
}
734
601
}
735
602
736
603
if(debug){
737
604
fprintf(stderr, "Establishing TLS session with %s\n", ip);
738
605
}
739
606
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
}
607
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
608
609
do{
610
ret = gnutls_handshake (session);
758
611
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
759
612
760
if(ret != GNUTLS_E_SUCCESS){
613
if (ret != GNUTLS_E_SUCCESS){
761
614
if(debug){
762
615
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
763
gnutls_perror(ret);
616
gnutls_perror (ret);
764
617
}
765
errno = EPROTO;
618
retval = -1;
766
619
goto mandos_end;
767
620
}
768
621
769
622
/* Read OpenPGP packet that contains the wanted password */
770
623
771
624
if(debug){
772
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
625
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
773
626
ip);
774
627
}
775
628
776
629
while(true){
777
778
if(quit_now){
779
errno = EINTR;
780
goto mandos_end;
781
}
782
783
buffer_capacity = incbuffer(&buffer, buffer_length,
630
buffer_capacity = adjustbuffer(&buffer, buffer_length,
784
631
buffer_capacity);
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){
632
if (buffer_capacity == 0){
633
perror("adjustbuffer");
634
retval = -1;
635
goto mandos_end;
636
}
637
638
ret = gnutls_record_recv(session, buffer+buffer_length,
639
BUFFER_SIZE);
640
if (ret == 0){
800
641
break;
801
642
}
802
if(sret < 0){
803
switch(sret){
643
if (ret < 0){
644
switch(ret){
804
645
case GNUTLS_E_INTERRUPTED:
805
646
case GNUTLS_E_AGAIN:
806
647
break;
807
648
case GNUTLS_E_REHANDSHAKE:
808
do {
809
ret = gnutls_handshake(session);
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
649
do{
650
ret = gnutls_handshake (session);
815
651
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
if(ret < 0){
652
if (ret < 0){
817
653
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
818
gnutls_perror(ret);
819
errno = EPROTO;
654
gnutls_perror (ret);
655
retval = -1;
820
656
goto mandos_end;
821
657
}
822
658
break;
823
659
default:
824
660
fprintf(stderr, "Unknown error while reading data from"
825
661
" encrypted session with Mandos server\n");
826
gnutls_bye(session, GNUTLS_SHUT_RDWR);
827
errno = EIO;
662
retval = -1;
663
gnutls_bye (session, GNUTLS_SHUT_RDWR);
828
664
goto mandos_end;
829
665
}
830
666
} else {
831
buffer_length += (size_t) sret;
667
buffer_length += (size_t) ret;
832
668
}
833
669
}
834
670
836
672
fprintf(stderr, "Closing TLS session\n");
837
673
}
838
674
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,
675
gnutls_bye (session, GNUTLS_SHUT_RDWR);
676
677
if (buffer_length > 0){
678
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
855
679
buffer_length,
856
680
&decrypted_buffer);
857
if(decrypted_buffer_size >= 0){
858
681
if (decrypted_buffer_size >= 0){
859
682
written = 0;
860
683
while(written < (size_t) decrypted_buffer_size){
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);
684
ret = (int)fwrite (decrypted_buffer + written, 1,
685
(size_t)decrypted_buffer_size - written,
686
stdout);
869
687
if(ret == 0 and ferror(stdout)){
870
int e = errno;
871
688
if(debug){
872
689
fprintf(stderr, "Error writing encrypted data: %s\n",
873
690
strerror(errno));
874
691
}
875
errno = e;
876
goto mandos_end;
692
retval = -1;
693
break;
877
694
}
878
695
written += (size_t)ret;
879
696
}
880
retval = 0;
697
free(decrypted_buffer);
698
} else {
699
retval = -1;
881
700
}
701
} else {
702
retval = -1;
882
703
}
883
704
884
705
/* Shutdown procedure */
885
706
886
707
mandos_end:
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;
708
free(buffer);
709
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
710
if(ret == -1){
711
perror("close");
906
712
}
713
gnutls_deinit (session);
907
714
return retval;
908
715
}
909
716
910
717
static void resolve_callback(AvahiSServiceResolver *r,
911
718
AvahiIfIndex interface,
912
AvahiProtocol proto,
719
AVAHI_GCC_UNUSED AvahiProtocol protocol,
913
720
AvahiResolverEvent event,
914
721
const char *name,
915
722
const char *type,
920
727
AVAHI_GCC_UNUSED AvahiStringList *txt,
921
728
AVAHI_GCC_UNUSED AvahiLookupResultFlags
922
729
flags,
923
AVAHI_GCC_UNUSED void* userdata){
730
void* userdata) {
731
mandos_context *mc = userdata;
924
732
assert(r);
925
733
926
734
/* Called whenever a service has been resolved successfully or
927
735
timed out */
928
736
929
if(quit_now){
930
return;
931
}
932
933
switch(event){
737
switch (event) {
934
738
default:
935
739
case AVAHI_RESOLVER_FAILURE:
936
740
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
937
741
" of type '%s' in domain '%s': %s\n", name, type, domain,
938
avahi_strerror(avahi_server_errno(mc.server)));
742
avahi_strerror(avahi_server_errno(mc->server)));
939
743
break;
940
744
941
745
case AVAHI_RESOLVER_FOUND:
944
748
avahi_address_snprint(ip, sizeof(ip), address);
945
749
if(debug){
946
750
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
947
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
948
ip, (intmax_t)interface, port);
751
PRIu16 ") on port %d\n", name, host_name, ip,
752
interface, port);
949
753
}
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);
754
int ret = start_mandos_communication(ip, port, interface, mc);
755
if (ret == 0){
756
avahi_simple_poll_quit(mc->simple_poll);
954
757
}
955
758
}
956
759
}
957
760
avahi_s_service_resolver_free(r);
958
761
}
959
762
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){
763
static void browse_callback( AvahiSServiceBrowser *b,
764
AvahiIfIndex interface,
765
AvahiProtocol protocol,
766
AvahiBrowserEvent event,
767
const char *name,
768
const char *type,
769
const char *domain,
770
AVAHI_GCC_UNUSED AvahiLookupResultFlags
771
flags,
772
void* userdata) {
773
mandos_context *mc = userdata;
970
774
assert(b);
971
775
972
776
/* Called whenever a new services becomes available on the LAN or
973
777
is removed from the LAN */
974
778
975
if(quit_now){
976
return;
977
}
978
979
switch(event){
779
switch (event) {
980
780
default:
981
781
case AVAHI_BROWSER_FAILURE:
982
782
983
783
fprintf(stderr, "(Avahi browser) %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
avahi_simple_poll_quit(mc.simple_poll);
784
avahi_strerror(avahi_server_errno(mc->server)));
785
avahi_simple_poll_quit(mc->simple_poll);
986
786
return;
987
787
988
788
case AVAHI_BROWSER_NEW:
991
791
the callback function is called the Avahi server will free the
992
792
resolver for us. */
993
793
994
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
995
name, type, domain, protocol, 0,
996
resolve_callback, NULL) == NULL)
794
if (!(avahi_s_service_resolver_new(mc->server, interface,
795
protocol, name, type, domain,
796
AVAHI_PROTO_INET6, 0,
797
resolve_callback, mc)))
997
798
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
998
name, avahi_strerror(avahi_server_errno(mc.server)));
799
name, avahi_strerror(avahi_server_errno(mc->server)));
999
800
break;
1000
801
1001
802
case AVAHI_BROWSER_REMOVE:
1010
811
}
1011
812
}
1012
813
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
/* Reject non-ARP interfaces (including dummy interfaces) */
1117
if(flags & IFF_NOARP){
1118
if(debug){
1119
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1120
if_entry->d_name);
1121
}
1122
return 0;
1123
}
1124
/* Accept this device */
1125
if(debug){
1126
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1127
if_entry->d_name);
1128
}
1129
return 1;
1130
}
1131
1132
814
int main(int argc, char *argv[]){
1133
AvahiSServiceBrowser *sb = NULL;
1134
int error;
1135
int ret;
1136
intmax_t tmpmax;
1137
char *tmp;
1138
int exitcode = EXIT_SUCCESS;
1139
const char *interface = "";
1140
struct ifreq network;
1141
int sd = -1;
1142
bool take_down_interface = false;
1143
uid_t uid;
1144
gid_t gid;
1145
char tempdir[] = "/tmp/mandosXXXXXX";
1146
bool tempdir_created = false;
1147
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1148
const char *seckey = PATHDIR "/" SECKEY;
1149
const char *pubkey = PATHDIR "/" PUBKEY;
1150
1151
bool gnutls_initialized = false;
1152
bool gpgme_initialized = false;
1153
float delay = 2.5f;
1154
1155
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1156
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1157
1158
uid = getuid();
1159
gid = getgid();
1160
1161
/* Lower any group privileges we might have, just to be safe */
1162
errno = 0;
1163
ret = setgid(gid);
1164
if(ret == -1){
1165
perror("setgid");
1166
}
1167
1168
/* Lower user privileges (temporarily) */
1169
errno = 0;
1170
ret = seteuid(uid);
1171
if(ret == -1){
1172
perror("seteuid");
1173
}
1174
1175
if(quit_now){
1176
goto end;
1177
}
1178
1179
{
1180
struct argp_option options[] = {
1181
{ .name = "debug", .key = 128,
1182
.doc = "Debug mode", .group = 3 },
1183
{ .name = "connect", .key = 'c',
1184
.arg = "ADDRESS:PORT",
1185
.doc = "Connect directly to a specific Mandos server",
1186
.group = 1 },
1187
{ .name = "interface", .key = 'i',
1188
.arg = "NAME",
1189
.doc = "Network interface that will be used to search for"
1190
" Mandos servers",
1191
.group = 1 },
1192
{ .name = "seckey", .key = 's',
1193
.arg = "FILE",
1194
.doc = "OpenPGP secret key file base name",
1195
.group = 1 },
1196
{ .name = "pubkey", .key = 'p',
1197
.arg = "FILE",
1198
.doc = "OpenPGP public key file base name",
1199
.group = 2 },
1200
{ .name = "dh-bits", .key = 129,
1201
.arg = "BITS",
1202
.doc = "Bit length of the prime number used in the"
1203
" Diffie-Hellman key exchange",
1204
.group = 2 },
1205
{ .name = "priority", .key = 130,
1206
.arg = "STRING",
1207
.doc = "GnuTLS priority string for the TLS handshake",
1208
.group = 1 },
1209
{ .name = "delay", .key = 131,
1210
.arg = "SECONDS",
1211
.doc = "Maximum delay to wait for interface startup",
1212
.group = 2 },
1213
/*
1214
* These reproduce what we would get without ARGP_NO_HELP
1215
*/
1216
{ .name = "help", .key = '?',
1217
.doc = "Give this help list", .group = -1 },
1218
{ .name = "usage", .key = -3,
1219
.doc = "Give a short usage message", .group = -1 },
1220
{ .name = "version", .key = 'V',
1221
.doc = "Print program version", .group = -1 },
1222
{ .name = NULL }
1223
};
1224
1225
error_t parse_opt(int key, char *arg,
1226
struct argp_state *state){
1227
errno = 0;
1228
switch(key){
1229
case 128: /* --debug */
1230
debug = true;
1231
break;
1232
case 'c': /* --connect */
1233
connect_to = arg;
1234
break;
1235
case 'i': /* --interface */
1236
interface = arg;
1237
break;
1238
case 's': /* --seckey */
1239
seckey = arg;
1240
break;
1241
case 'p': /* --pubkey */
1242
pubkey = arg;
1243
break;
1244
case 129: /* --dh-bits */
1245
errno = 0;
1246
tmpmax = strtoimax(arg, &tmp, 10);
1247
if(errno != 0 or tmp == arg or *tmp != '\0'
1248
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1249
argp_error(state, "Bad number of DH bits");
1250
}
1251
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1252
break;
1253
case 130: /* --priority */
1254
mc.priority = arg;
1255
break;
1256
case 131: /* --delay */
1257
errno = 0;
1258
delay = strtof(arg, &tmp);
1259
if(errno != 0 or tmp == arg or *tmp != '\0'){
1260
argp_error(state, "Bad delay");
1261
}
1262
break;
1263
/*
1264
* These reproduce what we would get without ARGP_NO_HELP
1265
*/
1266
case '?': /* --help */
1267
argp_state_help(state, state->out_stream,
1268
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1269
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1270
case -3: /* --usage */
1271
argp_state_help(state, state->out_stream,
1272
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1273
case 'V': /* --version */
1274
fprintf(state->out_stream, "%s\n", argp_program_version);
1275
exit(argp_err_exit_status);
1276
break;
1277
default:
1278
return ARGP_ERR_UNKNOWN;
1279
}
1280
return errno;
1281
}
1282
1283
struct argp argp = { .options = options, .parser = parse_opt,
1284
.args_doc = "",
1285
.doc = "Mandos client -- Get and decrypt"
1286
" passwords from a Mandos server" };
1287
ret = argp_parse(&argp, argc, argv,
1288
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1289
switch(ret){
1290
case 0:
1291
break;
1292
case ENOMEM:
1293
default:
1294
errno = ret;
1295
perror("argp_parse");
1296
exitcode = EX_OSERR;
1297
goto end;
1298
case EINVAL:
1299
exitcode = EX_USAGE;
1300
goto end;
1301
}
1302
}
1303
1304
if(not debug){
1305
avahi_set_log_function(empty_log);
1306
}
1307
1308
if(interface[0] == '\0'){
1309
struct dirent **direntries;
1310
ret = scandir(sys_class_net, &direntries, good_interface,
1311
alphasort);
1312
if(ret >= 1){
1313
/* Pick the first good interface */
1314
interface = strdup(direntries[0]->d_name);
1315
if(debug){
1316
fprintf(stderr, "Using interface \"%s\"\n", interface);
1317
}
1318
if(interface == NULL){
1319
perror("malloc");
1320
free(direntries);
1321
exitcode = EXIT_FAILURE;
1322
goto end;
1323
}
1324
free(direntries);
1325
} else {
1326
free(direntries);
1327
fprintf(stderr, "Could not find a network interface\n");
1328
exitcode = EXIT_FAILURE;
1329
goto end;
1330
}
1331
}
1332
1333
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1334
from the signal handler */
1335
/* Initialize the pseudo-RNG for Avahi */
1336
srand((unsigned int) time(NULL));
1337
mc.simple_poll = avahi_simple_poll_new();
1338
if(mc.simple_poll == NULL){
1339
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1340
exitcode = EX_UNAVAILABLE;
1341
goto end;
1342
}
1343
1344
sigemptyset(&sigterm_action.sa_mask);
1345
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1346
if(ret == -1){
1347
perror("sigaddset");
1348
exitcode = EX_OSERR;
1349
goto end;
1350
}
1351
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1352
if(ret == -1){
1353
perror("sigaddset");
1354
exitcode = EX_OSERR;
1355
goto end;
1356
}
1357
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1358
if(ret == -1){
1359
perror("sigaddset");
1360
exitcode = EX_OSERR;
1361
goto end;
1362
}
1363
/* Need to check if the handler is SIG_IGN before handling:
1364
| [[info:libc:Initial Signal Actions]] |
1365
| [[info:libc:Basic Signal Handling]] |
1366
*/
1367
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1368
if(ret == -1){
1369
perror("sigaction");
1370
return EX_OSERR;
1371
}
1372
if(old_sigterm_action.sa_handler != SIG_IGN){
1373
ret = sigaction(SIGINT, &sigterm_action, NULL);
1374
if(ret == -1){
1375
perror("sigaction");
1376
exitcode = EX_OSERR;
1377
goto end;
1378
}
1379
}
1380
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1381
if(ret == -1){
1382
perror("sigaction");
1383
return EX_OSERR;
1384
}
1385
if(old_sigterm_action.sa_handler != SIG_IGN){
1386
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1387
if(ret == -1){
1388
perror("sigaction");
1389
exitcode = EX_OSERR;
1390
goto end;
1391
}
1392
}
1393
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1394
if(ret == -1){
1395
perror("sigaction");
1396
return EX_OSERR;
1397
}
1398
if(old_sigterm_action.sa_handler != SIG_IGN){
1399
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1400
if(ret == -1){
1401
perror("sigaction");
1402
exitcode = EX_OSERR;
1403
goto end;
1404
}
1405
}
1406
1407
/* If the interface is down, bring it up */
1408
if(strcmp(interface, "none") != 0){
815
AvahiSServiceBrowser *sb = NULL;
816
int error;
817
int ret;
818
int exitcode = EXIT_SUCCESS;
819
const char *interface = "eth0";
820
struct ifreq network;
821
int sd;
822
uid_t uid;
823
gid_t gid;
824
char *connect_to = NULL;
825
char tempdir[] = "/tmp/mandosXXXXXX";
826
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
827
const char *seckey = PATHDIR "/" SECKEY;
828
const char *pubkey = PATHDIR "/" PUBKEY;
829
830
mandos_context mc = { .simple_poll = NULL, .server = NULL,
831
.dh_bits = 1024, .priority = "SECURE256"
832
":!CTYPE-X.509:+CTYPE-OPENPGP" };
833
bool gnutls_initalized = false;
834
bool gpgme_initalized = false;
835
836
{
837
struct argp_option options[] = {
838
{ .name = "debug", .key = 128,
839
.doc = "Debug mode", .group = 3 },
840
{ .name = "connect", .key = 'c',
841
.arg = "ADDRESS:PORT",
842
.doc = "Connect directly to a specific Mandos server",
843
.group = 1 },
844
{ .name = "interface", .key = 'i',
845
.arg = "NAME",
846
.doc = "Interface that will be used to search for Mandos"
847
" servers",
848
.group = 1 },
849
{ .name = "seckey", .key = 's',
850
.arg = "FILE",
851
.doc = "OpenPGP secret key file base name",
852
.group = 1 },
853
{ .name = "pubkey", .key = 'p',
854
.arg = "FILE",
855
.doc = "OpenPGP public key file base name",
856
.group = 2 },
857
{ .name = "dh-bits", .key = 129,
858
.arg = "BITS",
859
.doc = "Bit length of the prime number used in the"
860
" Diffie-Hellman key exchange",
861
.group = 2 },
862
{ .name = "priority", .key = 130,
863
.arg = "STRING",
864
.doc = "GnuTLS priority string for the TLS handshake",
865
.group = 1 },
866
{ .name = NULL }
867
};
868
869
error_t parse_opt (int key, char *arg,
870
struct argp_state *state) {
871
/* Get the INPUT argument from `argp_parse', which we know is
872
a pointer to our plugin list pointer. */
873
switch (key) {
874
case 128: /* --debug */
875
debug = true;
876
break;
877
case 'c': /* --connect */
878
connect_to = arg;
879
break;
880
case 'i': /* --interface */
881
interface = arg;
882
break;
883
case 's': /* --seckey */
884
seckey = arg;
885
break;
886
case 'p': /* --pubkey */
887
pubkey = arg;
888
break;
889
case 129: /* --dh-bits */
890
errno = 0;
891
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
892
if (errno){
893
perror("strtol");
894
exit(EXIT_FAILURE);
895
}
896
break;
897
case 130: /* --priority */
898
mc.priority = arg;
899
break;
900
case ARGP_KEY_ARG:
901
argp_usage (state);
902
case ARGP_KEY_END:
903
break;
904
default:
905
return ARGP_ERR_UNKNOWN;
906
}
907
return 0;
908
}
909
910
struct argp argp = { .options = options, .parser = parse_opt,
911
.args_doc = "",
912
.doc = "Mandos client -- Get and decrypt"
913
" passwords from a Mandos server" };
914
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
915
if (ret == ARGP_ERR_UNKNOWN){
916
fprintf(stderr, "Unknown error while parsing arguments\n");
917
exitcode = EXIT_FAILURE;
918
goto end;
919
}
920
}
921
922
/* If the interface is down, bring it up */
923
{
924
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
925
if(sd < 0) {
926
perror("socket");
927
exitcode = EXIT_FAILURE;
928
goto end;
929
}
930
strcpy(network.ifr_name, interface);
931
ret = ioctl(sd, SIOCGIFFLAGS, &network);
932
if(ret == -1){
933
perror("ioctl SIOCGIFFLAGS");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
if((network.ifr_flags & IFF_UP) == 0){
938
network.ifr_flags |= IFF_UP;
939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
940
if(ret == -1){
941
perror("ioctl SIOCSIFFLAGS");
942
exitcode = EXIT_FAILURE;
943
goto end;
944
}
945
}
946
ret = TEMP_FAILURE_RETRY(close(sd));
947
if(ret == -1){
948
perror("close");
949
}
950
}
951
952
uid = getuid();
953
gid = getgid();
954
955
ret = setuid(uid);
956
if (ret == -1){
957
perror("setuid");
958
}
959
960
setgid(gid);
961
if (ret == -1){
962
perror("setgid");
963
}
964
965
ret = init_gnutls_global(&mc, pubkey, seckey);
966
if (ret == -1){
967
fprintf(stderr, "init_gnutls_global failed\n");
968
exitcode = EXIT_FAILURE;
969
goto end;
970
} else {
971
gnutls_initalized = true;
972
}
973
974
if(mkdtemp(tempdir) == NULL){
975
perror("mkdtemp");
976
tempdir[0] = '\0';
977
goto end;
978
}
979
980
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
981
fprintf(stderr, "gpgme_initalized failed\n");
982
exitcode = EXIT_FAILURE;
983
goto end;
984
} else {
985
gpgme_initalized = true;
986
}
987
1409
988
if_index = (AvahiIfIndex) if_nametoindex(interface);
1410
989
if(if_index == 0){
1411
990
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1412
exitcode = EX_UNAVAILABLE;
1413
goto end;
1414
}
1415
1416
if(quit_now){
1417
goto end;
1418
}
1419
1420
/* Re-raise priviliges */
1421
errno = 0;
1422
ret = seteuid(0);
1423
if(ret == -1){
1424
perror("seteuid");
1425
}
1426
1427
#ifdef __linux__
1428
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1429
messages about the network interface to mess up the prompt */
1430
ret = klogctl(8, NULL, 5);
1431
bool restore_loglevel = true;
1432
if(ret == -1){
1433
restore_loglevel = false;
1434
perror("klogctl");
1435
}
1436
#endif /* __linux__ */
1437
1438
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1439
if(sd < 0){
1440
perror("socket");
1441
exitcode = EX_OSERR;
1442
#ifdef __linux__
1443
if(restore_loglevel){
1444
ret = klogctl(7, NULL, 0);
1445
if(ret == -1){
1446
perror("klogctl");
1447
}
1448
}
1449
#endif /* __linux__ */
1450
/* Lower privileges */
1451
errno = 0;
1452
ret = seteuid(uid);
1453
if(ret == -1){
1454
perror("seteuid");
1455
}
1456
goto end;
1457
}
1458
strcpy(network.ifr_name, interface);
1459
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1460
if(ret == -1){
1461
perror("ioctl SIOCGIFFLAGS");
1462
#ifdef __linux__
1463
if(restore_loglevel){
1464
ret = klogctl(7, NULL, 0);
1465
if(ret == -1){
1466
perror("klogctl");
1467
}
1468
}
1469
#endif /* __linux__ */
1470
exitcode = EX_OSERR;
1471
/* Lower privileges */
1472
errno = 0;
1473
ret = seteuid(uid);
1474
if(ret == -1){
1475
perror("seteuid");
1476
}
1477
goto end;
1478
}
1479
if((network.ifr_flags & IFF_UP) == 0){
1480
network.ifr_flags |= IFF_UP;
1481
take_down_interface = true;
1482
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1483
if(ret == -1){
1484
take_down_interface = false;
1485
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1486
exitcode = EX_OSERR;
1487
#ifdef __linux__
1488
if(restore_loglevel){
1489
ret = klogctl(7, NULL, 0);
1490
if(ret == -1){
1491
perror("klogctl");
1492
}
1493
}
1494
#endif /* __linux__ */
1495
/* Lower privileges */
1496
errno = 0;
1497
ret = seteuid(uid);
1498
if(ret == -1){
1499
perror("seteuid");
1500
}
1501
goto end;
1502
}
1503
}
1504
/* sleep checking until interface is running */
1505
for(int i=0; i < delay * 4; i++){
1506
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1507
if(ret == -1){
1508
perror("ioctl SIOCGIFFLAGS");
1509
} else if(network.ifr_flags & IFF_RUNNING){
1510
break;
1511
}
1512
struct timespec sleeptime = { .tv_nsec = 250000000 };
1513
ret = nanosleep(&sleeptime, NULL);
1514
if(ret == -1 and errno != EINTR){
1515
perror("nanosleep");
1516
}
1517
}
1518
if(not take_down_interface){
1519
/* We won't need the socket anymore */
1520
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1521
if(ret == -1){
1522
perror("close");
1523
}
1524
}
1525
#ifdef __linux__
1526
if(restore_loglevel){
1527
/* Restores kernel loglevel to default */
1528
ret = klogctl(7, NULL, 0);
1529
if(ret == -1){
1530
perror("klogctl");
1531
}
1532
}
1533
#endif /* __linux__ */
1534
/* Lower privileges */
1535
errno = 0;
1536
if(take_down_interface){
1537
/* Lower privileges */
1538
ret = seteuid(uid);
1539
if(ret == -1){
1540
perror("seteuid");
1541
}
1542
} else {
1543
/* Lower privileges permanently */
1544
ret = setuid(uid);
1545
if(ret == -1){
1546
perror("setuid");
1547
}
1548
}
1549
}
1550
1551
if(quit_now){
1552
goto end;
1553
}
1554
1555
ret = init_gnutls_global(pubkey, seckey);
1556
if(ret == -1){
1557
fprintf(stderr, "init_gnutls_global failed\n");
1558
exitcode = EX_UNAVAILABLE;
1559
goto end;
1560
} else {
1561
gnutls_initialized = true;
1562
}
1563
1564
if(quit_now){
1565
goto end;
1566
}
1567
1568
tempdir_created = true;
1569
if(mkdtemp(tempdir) == NULL){
1570
tempdir_created = false;
1571
perror("mkdtemp");
1572
goto end;
1573
}
1574
1575
if(quit_now){
1576
goto end;
1577
}
1578
1579
if(not init_gpgme(pubkey, seckey, tempdir)){
1580
fprintf(stderr, "init_gpgme failed\n");
1581
exitcode = EX_UNAVAILABLE;
1582
goto end;
1583
} else {
1584
gpgme_initialized = true;
1585
}
1586
1587
if(quit_now){
1588
goto end;
1589
}
1590
1591
if(connect_to != NULL){
1592
/* Connect directly, do not use Zeroconf */
1593
/* (Mainly meant for debugging) */
1594
char *address = strrchr(connect_to, ':');
1595
if(address == NULL){
1596
fprintf(stderr, "No colon in address\n");
1597
exitcode = EX_USAGE;
1598
goto end;
1599
}
1600
1601
if(quit_now){
1602
goto end;
1603
}
1604
1605
uint16_t port;
1606
errno = 0;
1607
tmpmax = strtoimax(address+1, &tmp, 10);
1608
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1609
or tmpmax != (uint16_t)tmpmax){
1610
fprintf(stderr, "Bad port number\n");
1611
exitcode = EX_USAGE;
1612
goto end;
1613
}
1614
1615
if(quit_now){
1616
goto end;
1617
}
1618
1619
port = (uint16_t)tmpmax;
1620
*address = '\0';
1621
address = connect_to;
1622
/* Colon in address indicates IPv6 */
1623
int af;
1624
if(strchr(address, ':') != NULL){
1625
af = AF_INET6;
1626
} else {
1627
af = AF_INET;
1628
}
1629
1630
if(quit_now){
1631
goto end;
1632
}
1633
1634
while(not quit_now){
1635
ret = start_mandos_communication(address, port, if_index, af);
1636
if(quit_now or ret == 0){
1637
break;
1638
}
1639
sleep(15);
1640
};
1641
1642
if (not quit_now){
1643
exitcode = EXIT_SUCCESS;
1644
}
1645
1646
goto end;
1647
}
1648
1649
if(quit_now){
1650
goto end;
1651
}
1652
1653
{
1654
AvahiServerConfig config;
1655
/* Do not publish any local Zeroconf records */
1656
avahi_server_config_init(&config);
1657
config.publish_hinfo = 0;
1658
config.publish_addresses = 0;
1659
config.publish_workstation = 0;
1660
config.publish_domain = 0;
1661
1662
/* Allocate a new server */
1663
mc.server = avahi_server_new(avahi_simple_poll_get
1664
(mc.simple_poll), &config, NULL,
1665
NULL, &error);
1666
1667
/* Free the Avahi configuration data */
1668
avahi_server_config_free(&config);
1669
}
1670
1671
/* Check if creating the Avahi server object succeeded */
1672
if(mc.server == NULL){
1673
fprintf(stderr, "Failed to create Avahi server: %s\n",
1674
avahi_strerror(error));
1675
exitcode = EX_UNAVAILABLE;
1676
goto end;
1677
}
1678
1679
if(quit_now){
1680
goto end;
1681
}
1682
1683
/* Create the Avahi service browser */
1684
sb = avahi_s_service_browser_new(mc.server, if_index,
1685
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1686
NULL, 0, browse_callback, NULL);
1687
if(sb == NULL){
1688
fprintf(stderr, "Failed to create service browser: %s\n",
1689
avahi_strerror(avahi_server_errno(mc.server)));
1690
exitcode = EX_UNAVAILABLE;
1691
goto end;
1692
}
1693
1694
if(quit_now){
1695
goto end;
1696
}
1697
1698
/* Run the main loop */
1699
1700
if(debug){
1701
fprintf(stderr, "Starting Avahi loop search\n");
1702
}
1703
1704
avahi_simple_poll_loop(mc.simple_poll);
1705
991
exit(EXIT_FAILURE);
992
}
993
994
if(connect_to != NULL){
995
/* Connect directly, do not use Zeroconf */
996
/* (Mainly meant for debugging) */
997
char *address = strrchr(connect_to, ':');
998
if(address == NULL){
999
fprintf(stderr, "No colon in address\n");
1000
exitcode = EXIT_FAILURE;
1001
goto end;
1002
}
1003
errno = 0;
1004
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1005
if(errno){
1006
perror("Bad port number");
1007
exitcode = EXIT_FAILURE;
1008
goto end;
1009
}
1010
*address = '\0';
1011
address = connect_to;
1012
ret = start_mandos_communication(address, port, if_index, &mc);
1013
if(ret < 0){
1014
exitcode = EXIT_FAILURE;
1015
} else {
1016
exitcode = EXIT_SUCCESS;
1017
}
1018
goto end;
1019
}
1020
1021
if (not debug){
1022
avahi_set_log_function(empty_log);
1023
}
1024
1025
/* Initialize the pseudo-RNG for Avahi */
1026
srand((unsigned int) time(NULL));
1027
1028
/* Allocate main Avahi loop object */
1029
mc.simple_poll = avahi_simple_poll_new();
1030
if (mc.simple_poll == NULL) {
1031
fprintf(stderr, "Avahi: Failed to create simple poll"
1032
" object.\n");
1033
exitcode = EXIT_FAILURE;
1034
goto end;
1035
}
1036
1037
{
1038
AvahiServerConfig config;
1039
/* Do not publish any local Zeroconf records */
1040
avahi_server_config_init(&config);
1041
config.publish_hinfo = 0;
1042
config.publish_addresses = 0;
1043
config.publish_workstation = 0;
1044
config.publish_domain = 0;
1045
1046
/* Allocate a new server */
1047
mc.server = avahi_server_new(avahi_simple_poll_get
1048
(mc.simple_poll), &config, NULL,
1049
NULL, &error);
1050
1051
/* Free the Avahi configuration data */
1052
avahi_server_config_free(&config);
1053
}
1054
1055
/* Check if creating the Avahi server object succeeded */
1056
if (mc.server == NULL) {
1057
fprintf(stderr, "Failed to create Avahi server: %s\n",
1058
avahi_strerror(error));
1059
exitcode = EXIT_FAILURE;
1060
goto end;
1061
}
1062
1063
/* Create the Avahi service browser */
1064
sb = avahi_s_service_browser_new(mc.server, if_index,
1065
AVAHI_PROTO_INET6,
1066
"_mandos._tcp", NULL, 0,
1067
browse_callback, &mc);
1068
if (sb == NULL) {
1069
fprintf(stderr, "Failed to create service browser: %s\n",
1070
avahi_strerror(avahi_server_errno(mc.server)));
1071
exitcode = EXIT_FAILURE;
1072
goto end;
1073
}
1074
1075
/* Run the main loop */
1076
1077
if (debug){
1078
fprintf(stderr, "Starting Avahi loop search\n");
1079
}
1080
1081
avahi_simple_poll_loop(mc.simple_poll);
1082
1706
1083
end:
1707
1708
if(debug){
1709
fprintf(stderr, "%s exiting\n", argv[0]);
1710
}
1711
1712
/* Cleanup things */
1713
if(sb != NULL)
1714
avahi_s_service_browser_free(sb);
1715
1716
if(mc.server != NULL)
1717
avahi_server_free(mc.server);
1718
1719
if(mc.simple_poll != NULL)
1720
avahi_simple_poll_free(mc.simple_poll);
1721
1722
if(gnutls_initialized){
1723
gnutls_certificate_free_credentials(mc.cred);
1724
gnutls_global_deinit();
1725
gnutls_dh_params_deinit(mc.dh_params);
1726
}
1727
1728
if(gpgme_initialized){
1729
gpgme_release(mc.ctx);
1730
}
1731
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");
1739
}
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");
1749
}
1750
}
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");
1760
}
1761
}
1762
}
1763
1764
/* Removes the temp directory used by GPGME */
1765
if(tempdir_created){
1766
DIR *d;
1767
struct dirent *direntry;
1768
d = opendir(tempdir);
1769
if(d == NULL){
1770
if(errno != ENOENT){
1084
1085
if (debug){
1086
fprintf(stderr, "%s exiting\n", argv[0]);
1087
}
1088
1089
/* Cleanup things */
1090
if (sb != NULL)
1091
avahi_s_service_browser_free(sb);
1092
1093
if (mc.server != NULL)
1094
avahi_server_free(mc.server);
1095
1096
if (mc.simple_poll != NULL)
1097
avahi_simple_poll_free(mc.simple_poll);
1098
1099
if (gnutls_initalized){
1100
gnutls_certificate_free_credentials(mc.cred);
1101
gnutls_global_deinit ();
1102
gnutls_dh_params_deinit(mc.dh_params);
1103
}
1104
1105
if(gpgme_initalized){
1106
gpgme_release(mc.ctx);
1107
}
1108
1109
/* Removes the temp directory used by GPGME */
1110
if(tempdir[0] != '\0'){
1111
DIR *d;
1112
struct dirent *direntry;
1113
d = opendir(tempdir);
1114
if(d == NULL){
1771
1115
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
}
1786
char *fullname = NULL;
1787
ret = asprintf(&fullname, "%s/%s", tempdir,
1788
direntry->d_name);
1789
if(ret < 0){
1790
perror("asprintf");
1791
continue;
1792
}
1793
ret = remove(fullname);
1794
if(ret == -1){
1795
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1796
strerror(errno));
1797
}
1798
free(fullname);
1799
}
1800
closedir(d);
1801
}
1802
ret = rmdir(tempdir);
1803
if(ret == -1 and errno != ENOENT){
1804
perror("rmdir");
1805
}
1806
}
1807
1808
if(quit_now){
1809
sigemptyset(&old_sigterm_action.sa_mask);
1810
old_sigterm_action.sa_handler = SIG_DFL;
1811
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1812
&old_sigterm_action,
1813
NULL));
1814
if(ret == -1){
1815
perror("sigaction");
1816
}
1817
do {
1818
ret = raise(signal_received);
1819
} while(ret != 0 and errno == EINTR);
1820
if(ret != 0){
1821
perror("raise");
1822
abort();
1823
}
1824
TEMP_FAILURE_RETRY(pause());
1825
}
1826
1827
return exitcode;
1116
} else {
1117
while(true){
1118
direntry = readdir(d);
1119
if(direntry == NULL){
1120
break;
1121
}
1122
if (direntry->d_type == DT_REG){
1123
char *fullname = NULL;
1124
ret = asprintf(&fullname, "%s/%s", tempdir,
1125
direntry->d_name);
1126
if(ret < 0){
1127
perror("asprintf");
1128
continue;
1129
}
1130
ret = unlink(fullname);
1131
if(ret == -1){
1132
fprintf(stderr, "unlink(\"%s\"): %s",
1133
fullname, strerror(errno));
1134
}
1135
free(fullname);
1136
}
1137
}
1138
closedir(d);
1139
}
1140
ret = rmdir(tempdir);
1141
if(ret == -1){
1142
perror("rmdir");
1143
}
1144
}
1145
1146
return exitcode;
1828
1147
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0