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- Committer: Björn Påhlsson
- Date: 2011-06-19 20:25:38 UTC
- mto: This revision was merged to the branch mainline in revision 485.
- Revision ID: belorn@fukt.bsnet.se-20110619202538-0js072v8fso12u07
prepended mandos plugin to error messages in each plugin. Added a better way in TODO.
- files added:
- DBUS-API
- debian/po
- debian/source
- files removed:
- etc-plugins.d-README
- 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
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 = "mandos-client 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
198
175
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if (rc != GPG_ERR_NO_ERROR){
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
205
182
ret = TEMP_FAILURE_RETRY(close(fd));
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;
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){
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
318
339
perror("gpgme_data_seek");
319
340
plaintext_length = -1;
320
341
goto decrypt_end;
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();
454
gnutls_dh_params_deinit(mc->dh_params);
477
gnutls_dh_params_deinit(mc.dh_params);
455
478
return -1;
456
479
}
457
480
458
static int init_gnutls_session(mandos_context *mc,
459
gnutls_session_t *session){
481
static int init_gnutls_session(gnutls_session_t *session){
460
482
int ret;
461
483
/* GnuTLS session creation */
462
ret = gnutls_init(session, GNUTLS_SERVER);
463
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){
464
491
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
465
492
safer_gnutls_strerror(ret));
466
493
}
467
494
468
495
{
469
496
const char *err;
470
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
471
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){
472
505
fprintf(stderr, "Syntax error at: %s\n", err);
473
506
fprintf(stderr, "GnuTLS error: %s\n",
474
507
safer_gnutls_strerror(ret));
475
gnutls_deinit (*session);
508
gnutls_deinit(*session);
476
509
return -1;
477
510
}
478
511
}
479
512
480
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
481
mc->cred);
482
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){
483
522
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
484
523
safer_gnutls_strerror(ret));
485
gnutls_deinit (*session);
524
gnutls_deinit(*session);
486
525
return -1;
487
526
}
488
527
489
528
/* ignore client certificate if any. */
490
gnutls_certificate_server_set_request (*session,
491
GNUTLS_CERT_IGNORE);
529
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
492
530
493
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
531
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
494
532
495
533
return 0;
496
534
}
502
540
/* Called when a Mandos server is found */
503
541
static int start_mandos_communication(const char *ip, uint16_t port,
504
542
AvahiIfIndex if_index,
505
mandos_context *mc){
506
int ret, tcp_sd;
507
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;
508
550
char *buffer = NULL;
509
char *decrypted_buffer;
551
char *decrypted_buffer = NULL;
510
552
size_t buffer_length = 0;
511
553
size_t buffer_capacity = 0;
512
ssize_t decrypted_buffer_size;
513
554
size_t written;
514
int retval = 0;
515
char interface[IF_NAMESIZE];
555
int retval = -1;
516
556
gnutls_session_t session;
517
518
ret = init_gnutls_session (mc, &session);
519
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){
520
581
return -1;
521
582
}
522
583
523
584
if(debug){
524
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
585
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
525
586
"\n", ip, port);
526
587
}
527
588
528
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
529
if(tcp_sd < 0) {
589
tcp_sd = socket(pf, SOCK_STREAM, 0);
590
if(tcp_sd < 0){
591
int e = errno;
530
592
perror("socket");
531
return -1;
593
errno = e;
594
goto mandos_end;
532
595
}
533
596
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);
597
if(quit_now){
598
errno = EINTR;
599
goto mandos_end;
540
600
}
541
601
542
602
memset(&to, 0, sizeof(to));
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 ){
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;
548
612
perror("inet_pton");
549
return -1;
613
errno = e;
614
goto mandos_end;
550
615
}
551
616
if(ret == 0){
617
int e = errno;
552
618
fprintf(stderr, "Bad address: %s\n", ip);
553
return -1;
554
}
555
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
}
556
644
557
to.in6.sin6_scope_id = (uint32_t)if_index;
645
if(quit_now){
646
errno = EINTR;
647
goto mandos_end;
648
}
558
649
559
650
if(debug){
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){
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){
565
674
perror("inet_ntop");
566
675
} else {
567
676
if(strcmp(addrstr, ip) != 0){
570
679
}
571
680
}
572
681
573
ret = connect(tcp_sd, &to.in, sizeof(to));
574
if (ret < 0){
575
perror("connect");
576
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;
577
704
}
578
705
579
706
const char *out = mandos_protocol_version;
580
707
written = 0;
581
while (true){
708
while(true){
582
709
size_t out_size = strlen(out);
583
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
710
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
584
711
out_size - written));
585
if (ret == -1){
712
if(ret == -1){
713
int e = errno;
586
714
perror("write");
587
retval = -1;
715
errno = e;
588
716
goto mandos_end;
589
717
}
590
718
written += (size_t)ret;
591
719
if(written < out_size){
592
720
continue;
593
721
} else {
594
if (out == mandos_protocol_version){
722
if(out == mandos_protocol_version){
595
723
written = 0;
596
724
out = "\r\n";
597
725
} else {
598
726
break;
599
727
}
600
728
}
729
730
if(quit_now){
731
errno = EINTR;
732
goto mandos_end;
733
}
601
734
}
602
735
603
736
if(debug){
604
737
fprintf(stderr, "Establishing TLS session with %s\n", ip);
605
738
}
606
739
607
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
608
609
do{
610
ret = gnutls_handshake (session);
740
if(quit_now){
741
errno = EINTR;
742
goto mandos_end;
743
}
744
745
/* Spurious warnings from -Wint-to-pointer-cast */
746
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
747
748
if(quit_now){
749
errno = EINTR;
750
goto mandos_end;
751
}
752
753
do {
754
ret = gnutls_handshake(session);
755
if(quit_now){
756
errno = EINTR;
757
goto mandos_end;
758
}
611
759
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
612
760
613
if (ret != GNUTLS_E_SUCCESS){
761
if(ret != GNUTLS_E_SUCCESS){
614
762
if(debug){
615
763
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
616
gnutls_perror (ret);
764
gnutls_perror(ret);
617
765
}
618
retval = -1;
766
errno = EPROTO;
619
767
goto mandos_end;
620
768
}
621
769
622
770
/* Read OpenPGP packet that contains the wanted password */
623
771
624
772
if(debug){
625
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
773
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
626
774
ip);
627
775
}
628
776
629
777
while(true){
630
buffer_capacity = adjustbuffer(&buffer, buffer_length,
778
779
if(quit_now){
780
errno = EINTR;
781
goto mandos_end;
782
}
783
784
buffer_capacity = incbuffer(&buffer, buffer_length,
631
785
buffer_capacity);
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){
786
if(buffer_capacity == 0){
787
int e = errno;
788
perror("incbuffer");
789
errno = e;
790
goto mandos_end;
791
}
792
793
if(quit_now){
794
errno = EINTR;
795
goto mandos_end;
796
}
797
798
sret = gnutls_record_recv(session, buffer+buffer_length,
799
BUFFER_SIZE);
800
if(sret == 0){
641
801
break;
642
802
}
643
if (ret < 0){
644
switch(ret){
803
if(sret < 0){
804
switch(sret){
645
805
case GNUTLS_E_INTERRUPTED:
646
806
case GNUTLS_E_AGAIN:
647
807
break;
648
808
case GNUTLS_E_REHANDSHAKE:
649
do{
650
ret = gnutls_handshake (session);
809
do {
810
ret = gnutls_handshake(session);
811
812
if(quit_now){
813
errno = EINTR;
814
goto mandos_end;
815
}
651
816
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
652
if (ret < 0){
817
if(ret < 0){
653
818
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
654
gnutls_perror (ret);
655
retval = -1;
819
gnutls_perror(ret);
820
errno = EPROTO;
656
821
goto mandos_end;
657
822
}
658
823
break;
659
824
default:
660
825
fprintf(stderr, "Unknown error while reading data from"
661
826
" encrypted session with Mandos server\n");
662
retval = -1;
663
gnutls_bye (session, GNUTLS_SHUT_RDWR);
827
gnutls_bye(session, GNUTLS_SHUT_RDWR);
828
errno = EIO;
664
829
goto mandos_end;
665
830
}
666
831
} else {
667
buffer_length += (size_t) ret;
832
buffer_length += (size_t) sret;
668
833
}
669
834
}
670
835
672
837
fprintf(stderr, "Closing TLS session\n");
673
838
}
674
839
675
gnutls_bye (session, GNUTLS_SHUT_RDWR);
676
677
if (buffer_length > 0){
678
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
840
if(quit_now){
841
errno = EINTR;
842
goto mandos_end;
843
}
844
845
do {
846
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
847
if(quit_now){
848
errno = EINTR;
849
goto mandos_end;
850
}
851
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
852
853
if(buffer_length > 0){
854
ssize_t decrypted_buffer_size;
855
decrypted_buffer_size = pgp_packet_decrypt(buffer,
679
856
buffer_length,
680
857
&decrypted_buffer);
681
if (decrypted_buffer_size >= 0){
858
if(decrypted_buffer_size >= 0){
859
682
860
written = 0;
683
861
while(written < (size_t) decrypted_buffer_size){
684
ret = (int)fwrite (decrypted_buffer + written, 1,
685
(size_t)decrypted_buffer_size - written,
686
stdout);
862
if(quit_now){
863
errno = EINTR;
864
goto mandos_end;
865
}
866
867
ret = (int)fwrite(decrypted_buffer + written, 1,
868
(size_t)decrypted_buffer_size - written,
869
stdout);
687
870
if(ret == 0 and ferror(stdout)){
871
int e = errno;
688
872
if(debug){
689
873
fprintf(stderr, "Error writing encrypted data: %s\n",
690
874
strerror(errno));
691
875
}
692
retval = -1;
693
break;
876
errno = e;
877
goto mandos_end;
694
878
}
695
879
written += (size_t)ret;
696
880
}
697
free(decrypted_buffer);
698
} else {
699
retval = -1;
881
retval = 0;
700
882
}
701
} else {
702
retval = -1;
703
883
}
704
884
705
885
/* Shutdown procedure */
706
886
707
887
mandos_end:
708
free(buffer);
709
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
710
if(ret == -1){
711
perror("close");
888
{
889
int e = errno;
890
free(decrypted_buffer);
891
free(buffer);
892
if(tcp_sd >= 0){
893
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
894
}
895
if(ret == -1){
896
if(e == 0){
897
e = errno;
898
}
899
perror("close");
900
}
901
gnutls_deinit(session);
902
if(quit_now){
903
e = EINTR;
904
retval = -1;
905
}
906
errno = e;
712
907
}
713
gnutls_deinit (session);
714
908
return retval;
715
909
}
716
910
717
911
static void resolve_callback(AvahiSServiceResolver *r,
718
912
AvahiIfIndex interface,
719
AVAHI_GCC_UNUSED AvahiProtocol protocol,
913
AvahiProtocol proto,
720
914
AvahiResolverEvent event,
721
915
const char *name,
722
916
const char *type,
727
921
AVAHI_GCC_UNUSED AvahiStringList *txt,
728
922
AVAHI_GCC_UNUSED AvahiLookupResultFlags
729
923
flags,
730
void* userdata) {
731
mandos_context *mc = userdata;
924
AVAHI_GCC_UNUSED void* userdata){
732
925
assert(r);
733
926
734
927
/* Called whenever a service has been resolved successfully or
735
928
timed out */
736
929
737
switch (event) {
930
if(quit_now){
931
return;
932
}
933
934
switch(event){
738
935
default:
739
936
case AVAHI_RESOLVER_FAILURE:
740
937
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
741
938
" of type '%s' in domain '%s': %s\n", name, type, domain,
742
avahi_strerror(avahi_server_errno(mc->server)));
939
avahi_strerror(avahi_server_errno(mc.server)));
743
940
break;
744
941
745
942
case AVAHI_RESOLVER_FOUND:
748
945
avahi_address_snprint(ip, sizeof(ip), address);
749
946
if(debug){
750
947
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
751
PRIu16 ") on port %d\n", name, host_name, ip,
752
interface, port);
948
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
949
ip, (intmax_t)interface, port);
753
950
}
754
int ret = start_mandos_communication(ip, port, interface, mc);
755
if (ret == 0){
756
avahi_simple_poll_quit(mc->simple_poll);
951
int ret = start_mandos_communication(ip, port, interface,
952
avahi_proto_to_af(proto));
953
if(ret == 0){
954
avahi_simple_poll_quit(mc.simple_poll);
757
955
}
758
956
}
759
957
}
760
958
avahi_s_service_resolver_free(r);
761
959
}
762
960
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;
961
static void browse_callback(AvahiSServiceBrowser *b,
962
AvahiIfIndex interface,
963
AvahiProtocol protocol,
964
AvahiBrowserEvent event,
965
const char *name,
966
const char *type,
967
const char *domain,
968
AVAHI_GCC_UNUSED AvahiLookupResultFlags
969
flags,
970
AVAHI_GCC_UNUSED void* userdata){
774
971
assert(b);
775
972
776
973
/* Called whenever a new services becomes available on the LAN or
777
974
is removed from the LAN */
778
975
779
switch (event) {
976
if(quit_now){
977
return;
978
}
979
980
switch(event){
780
981
default:
781
982
case AVAHI_BROWSER_FAILURE:
782
983
783
984
fprintf(stderr, "(Avahi browser) %s\n",
784
avahi_strerror(avahi_server_errno(mc->server)));
785
avahi_simple_poll_quit(mc->simple_poll);
985
avahi_strerror(avahi_server_errno(mc.server)));
986
avahi_simple_poll_quit(mc.simple_poll);
786
987
return;
787
988
788
989
case AVAHI_BROWSER_NEW:
791
992
the callback function is called the Avahi server will free the
792
993
resolver for us. */
793
994
794
if (!(avahi_s_service_resolver_new(mc->server, interface,
795
protocol, name, type, domain,
796
AVAHI_PROTO_INET6, 0,
797
resolve_callback, mc)))
995
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
996
name, type, domain, protocol, 0,
997
resolve_callback, NULL) == NULL)
798
998
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
799
name, avahi_strerror(avahi_server_errno(mc->server)));
999
name, avahi_strerror(avahi_server_errno(mc.server)));
800
1000
break;
801
1001
802
1002
case AVAHI_BROWSER_REMOVE:
811
1011
}
812
1012
}
813
1013
1014
/* stop main loop after sigterm has been called */
1015
static void handle_sigterm(int sig){
1016
if(quit_now){
1017
return;
1018
}
1019
quit_now = 1;
1020
signal_received = sig;
1021
int old_errno = errno;
1022
if(mc.simple_poll != NULL){
1023
avahi_simple_poll_quit(mc.simple_poll);
1024
}
1025
errno = old_errno;
1026
}
1027
1028
/*
1029
* This function determines if a directory entry in /sys/class/net
1030
* corresponds to an acceptable network device.
1031
* (This function is passed to scandir(3) as a filter function.)
1032
*/
1033
int good_interface(const struct dirent *if_entry){
1034
ssize_t ssret;
1035
char *flagname = NULL;
1036
if(if_entry->d_name[0] == '.'){
1037
return 0;
1038
}
1039
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1040
if_entry->d_name);
1041
if(ret < 0){
1042
perror("asprintf");
1043
return 0;
1044
}
1045
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1046
if(flags_fd == -1){
1047
perror("open");
1048
free(flagname);
1049
return 0;
1050
}
1051
free(flagname);
1052
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1053
/* read line from flags_fd */
1054
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1055
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1056
flagstring[(size_t)to_read] = '\0';
1057
if(flagstring == NULL){
1058
perror("malloc");
1059
close(flags_fd);
1060
return 0;
1061
}
1062
while(to_read > 0){
1063
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1064
(size_t)to_read));
1065
if(ssret == -1){
1066
perror("read");
1067
free(flagstring);
1068
close(flags_fd);
1069
return 0;
1070
}
1071
to_read -= ssret;
1072
if(ssret == 0){
1073
break;
1074
}
1075
}
1076
close(flags_fd);
1077
intmax_t tmpmax;
1078
char *tmp;
1079
errno = 0;
1080
tmpmax = strtoimax(flagstring, &tmp, 0);
1081
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1082
and not (isspace(*tmp)))
1083
or tmpmax != (ifreq_flags)tmpmax){
1084
if(debug){
1085
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1086
flagstring, if_entry->d_name);
1087
}
1088
free(flagstring);
1089
return 0;
1090
}
1091
free(flagstring);
1092
ifreq_flags flags = (ifreq_flags)tmpmax;
1093
/* Reject the loopback device */
1094
if(flags & IFF_LOOPBACK){
1095
if(debug){
1096
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1097
if_entry->d_name);
1098
}
1099
return 0;
1100
}
1101
/* Accept point-to-point devices only if connect_to is specified */
1102
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1103
if(debug){
1104
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1105
if_entry->d_name);
1106
}
1107
return 1;
1108
}
1109
/* Otherwise, reject non-broadcast-capable devices */
1110
if(not (flags & IFF_BROADCAST)){
1111
if(debug){
1112
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1113
if_entry->d_name);
1114
}
1115
return 0;
1116
}
1117
/* Reject non-ARP interfaces (including dummy interfaces) */
1118
if(flags & IFF_NOARP){
1119
if(debug){
1120
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1121
if_entry->d_name);
1122
}
1123
return 0;
1124
}
1125
/* Accept this device */
1126
if(debug){
1127
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1128
if_entry->d_name);
1129
}
1130
return 1;
1131
}
1132
1133
int notdotentries(const struct dirent *direntry){
1134
/* Skip "." and ".." */
1135
if(direntry->d_name[0] == '.'
1136
and (direntry->d_name[1] == '\0'
1137
or (direntry->d_name[1] == '.'
1138
and direntry->d_name[2] == '\0'))){
1139
return 0;
1140
}
1141
return 1;
1142
}
1143
814
1144
int main(int argc, char *argv[]){
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
1145
AvahiSServiceBrowser *sb = NULL;
1146
int error;
1147
int ret;
1148
intmax_t tmpmax;
1149
char *tmp;
1150
int exitcode = EXIT_SUCCESS;
1151
const char *interface = "";
1152
struct ifreq network;
1153
int sd = -1;
1154
bool take_down_interface = false;
1155
uid_t uid;
1156
gid_t gid;
1157
char tempdir[] = "/tmp/mandosXXXXXX";
1158
bool tempdir_created = false;
1159
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1160
const char *seckey = PATHDIR "/" SECKEY;
1161
const char *pubkey = PATHDIR "/" PUBKEY;
1162
1163
bool gnutls_initialized = false;
1164
bool gpgme_initialized = false;
1165
float delay = 2.5f;
1166
1167
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1168
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1169
1170
uid = getuid();
1171
gid = getgid();
1172
1173
/* Lower any group privileges we might have, just to be safe */
1174
errno = 0;
1175
ret = setgid(gid);
1176
if(ret == -1){
1177
perror("setgid");
1178
}
1179
1180
/* Lower user privileges (temporarily) */
1181
errno = 0;
1182
ret = seteuid(uid);
1183
if(ret == -1){
1184
perror("seteuid");
1185
}
1186
1187
if(quit_now){
1188
goto end;
1189
}
1190
1191
{
1192
struct argp_option options[] = {
1193
{ .name = "debug", .key = 128,
1194
.doc = "Debug mode", .group = 3 },
1195
{ .name = "connect", .key = 'c',
1196
.arg = "ADDRESS:PORT",
1197
.doc = "Connect directly to a specific Mandos server",
1198
.group = 1 },
1199
{ .name = "interface", .key = 'i',
1200
.arg = "NAME",
1201
.doc = "Network interface that will be used to search for"
1202
" Mandos servers",
1203
.group = 1 },
1204
{ .name = "seckey", .key = 's',
1205
.arg = "FILE",
1206
.doc = "OpenPGP secret key file base name",
1207
.group = 1 },
1208
{ .name = "pubkey", .key = 'p',
1209
.arg = "FILE",
1210
.doc = "OpenPGP public key file base name",
1211
.group = 2 },
1212
{ .name = "dh-bits", .key = 129,
1213
.arg = "BITS",
1214
.doc = "Bit length of the prime number used in the"
1215
" Diffie-Hellman key exchange",
1216
.group = 2 },
1217
{ .name = "priority", .key = 130,
1218
.arg = "STRING",
1219
.doc = "GnuTLS priority string for the TLS handshake",
1220
.group = 1 },
1221
{ .name = "delay", .key = 131,
1222
.arg = "SECONDS",
1223
.doc = "Maximum delay to wait for interface startup",
1224
.group = 2 },
1225
/*
1226
* These reproduce what we would get without ARGP_NO_HELP
1227
*/
1228
{ .name = "help", .key = '?',
1229
.doc = "Give this help list", .group = -1 },
1230
{ .name = "usage", .key = -3,
1231
.doc = "Give a short usage message", .group = -1 },
1232
{ .name = "version", .key = 'V',
1233
.doc = "Print program version", .group = -1 },
1234
{ .name = NULL }
1235
};
1236
1237
error_t parse_opt(int key, char *arg,
1238
struct argp_state *state){
1239
errno = 0;
1240
switch(key){
1241
case 128: /* --debug */
1242
debug = true;
1243
break;
1244
case 'c': /* --connect */
1245
connect_to = arg;
1246
break;
1247
case 'i': /* --interface */
1248
interface = arg;
1249
break;
1250
case 's': /* --seckey */
1251
seckey = arg;
1252
break;
1253
case 'p': /* --pubkey */
1254
pubkey = arg;
1255
break;
1256
case 129: /* --dh-bits */
1257
errno = 0;
1258
tmpmax = strtoimax(arg, &tmp, 10);
1259
if(errno != 0 or tmp == arg or *tmp != '\0'
1260
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1261
argp_error(state, "Bad number of DH bits");
1262
}
1263
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1264
break;
1265
case 130: /* --priority */
1266
mc.priority = arg;
1267
break;
1268
case 131: /* --delay */
1269
errno = 0;
1270
delay = strtof(arg, &tmp);
1271
if(errno != 0 or tmp == arg or *tmp != '\0'){
1272
argp_error(state, "Bad delay");
1273
}
1274
break;
1275
/*
1276
* These reproduce what we would get without ARGP_NO_HELP
1277
*/
1278
case '?': /* --help */
1279
argp_state_help(state, state->out_stream,
1280
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1281
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1282
case -3: /* --usage */
1283
argp_state_help(state, state->out_stream,
1284
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1285
case 'V': /* --version */
1286
fprintf(state->out_stream, "%s\n", argp_program_version);
1287
exit(argp_err_exit_status);
1288
break;
1289
default:
1290
return ARGP_ERR_UNKNOWN;
1291
}
1292
return errno;
1293
}
1294
1295
struct argp argp = { .options = options, .parser = parse_opt,
1296
.args_doc = "",
1297
.doc = "Mandos client -- Get and decrypt"
1298
" passwords from a Mandos server" };
1299
ret = argp_parse(&argp, argc, argv,
1300
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1301
switch(ret){
1302
case 0:
1303
break;
1304
case ENOMEM:
1305
default:
1306
errno = ret;
1307
perror("argp_parse");
1308
exitcode = EX_OSERR;
1309
goto end;
1310
case EINVAL:
1311
exitcode = EX_USAGE;
1312
goto end;
1313
}
1314
}
1315
1316
if(not debug){
1317
avahi_set_log_function(empty_log);
1318
}
1319
1320
if(interface[0] == '\0'){
1321
struct dirent **direntries;
1322
ret = scandir(sys_class_net, &direntries, good_interface,
1323
alphasort);
1324
if(ret >= 1){
1325
/* Pick the first good interface */
1326
interface = strdup(direntries[0]->d_name);
1327
if(debug){
1328
fprintf(stderr, "Using interface \"%s\"\n", interface);
1329
}
1330
if(interface == NULL){
1331
perror("malloc");
1332
free(direntries);
1333
exitcode = EXIT_FAILURE;
1334
goto end;
1335
}
1336
free(direntries);
1337
} else {
1338
free(direntries);
1339
fprintf(stderr, "Could not find a network interface\n");
1340
exitcode = EXIT_FAILURE;
1341
goto end;
1342
}
1343
}
1344
1345
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1346
from the signal handler */
1347
/* Initialize the pseudo-RNG for Avahi */
1348
srand((unsigned int) time(NULL));
1349
mc.simple_poll = avahi_simple_poll_new();
1350
if(mc.simple_poll == NULL){
1351
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1352
exitcode = EX_UNAVAILABLE;
1353
goto end;
1354
}
1355
1356
sigemptyset(&sigterm_action.sa_mask);
1357
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1358
if(ret == -1){
1359
perror("sigaddset");
1360
exitcode = EX_OSERR;
1361
goto end;
1362
}
1363
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1364
if(ret == -1){
1365
perror("sigaddset");
1366
exitcode = EX_OSERR;
1367
goto end;
1368
}
1369
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1370
if(ret == -1){
1371
perror("sigaddset");
1372
exitcode = EX_OSERR;
1373
goto end;
1374
}
1375
/* Need to check if the handler is SIG_IGN before handling:
1376
| [[info:libc:Initial Signal Actions]] |
1377
| [[info:libc:Basic Signal Handling]] |
1378
*/
1379
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1380
if(ret == -1){
1381
perror("sigaction");
1382
return EX_OSERR;
1383
}
1384
if(old_sigterm_action.sa_handler != SIG_IGN){
1385
ret = sigaction(SIGINT, &sigterm_action, NULL);
1386
if(ret == -1){
1387
perror("sigaction");
1388
exitcode = EX_OSERR;
1389
goto end;
1390
}
1391
}
1392
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1393
if(ret == -1){
1394
perror("sigaction");
1395
return EX_OSERR;
1396
}
1397
if(old_sigterm_action.sa_handler != SIG_IGN){
1398
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1399
if(ret == -1){
1400
perror("sigaction");
1401
exitcode = EX_OSERR;
1402
goto end;
1403
}
1404
}
1405
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1406
if(ret == -1){
1407
perror("sigaction");
1408
return EX_OSERR;
1409
}
1410
if(old_sigterm_action.sa_handler != SIG_IGN){
1411
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1412
if(ret == -1){
1413
perror("sigaction");
1414
exitcode = EX_OSERR;
1415
goto end;
1416
}
1417
}
1418
1419
/* If the interface is down, bring it up */
1420
if(strcmp(interface, "none") != 0){
988
1421
if_index = (AvahiIfIndex) if_nametoindex(interface);
989
1422
if(if_index == 0){
990
1423
fprintf(stderr, "No such interface: \"%s\"\n", interface);
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
1424
exitcode = EX_UNAVAILABLE;
1425
goto end;
1426
}
1427
1428
if(quit_now){
1429
goto end;
1430
}
1431
1432
/* Re-raise priviliges */
1433
errno = 0;
1434
ret = seteuid(0);
1435
if(ret == -1){
1436
perror("seteuid");
1437
}
1438
1439
#ifdef __linux__
1440
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1441
messages about the network interface to mess up the prompt */
1442
ret = klogctl(8, NULL, 5);
1443
bool restore_loglevel = true;
1444
if(ret == -1){
1445
restore_loglevel = false;
1446
perror("klogctl");
1447
}
1448
#endif /* __linux__ */
1449
1450
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1451
if(sd < 0){
1452
perror("socket");
1453
exitcode = EX_OSERR;
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
/* Lower privileges */
1463
errno = 0;
1464
ret = seteuid(uid);
1465
if(ret == -1){
1466
perror("seteuid");
1467
}
1468
goto end;
1469
}
1470
strcpy(network.ifr_name, interface);
1471
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1472
if(ret == -1){
1473
perror("ioctl SIOCGIFFLAGS");
1474
#ifdef __linux__
1475
if(restore_loglevel){
1476
ret = klogctl(7, NULL, 0);
1477
if(ret == -1){
1478
perror("klogctl");
1479
}
1480
}
1481
#endif /* __linux__ */
1482
exitcode = EX_OSERR;
1483
/* Lower privileges */
1484
errno = 0;
1485
ret = seteuid(uid);
1486
if(ret == -1){
1487
perror("seteuid");
1488
}
1489
goto end;
1490
}
1491
if((network.ifr_flags & IFF_UP) == 0){
1492
network.ifr_flags |= IFF_UP;
1493
take_down_interface = true;
1494
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1495
if(ret == -1){
1496
take_down_interface = false;
1497
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1498
exitcode = EX_OSERR;
1499
#ifdef __linux__
1500
if(restore_loglevel){
1501
ret = klogctl(7, NULL, 0);
1502
if(ret == -1){
1503
perror("klogctl");
1504
}
1505
}
1506
#endif /* __linux__ */
1507
/* Lower privileges */
1508
errno = 0;
1509
ret = seteuid(uid);
1510
if(ret == -1){
1511
perror("seteuid");
1512
}
1513
goto end;
1514
}
1515
}
1516
/* sleep checking until interface is running */
1517
for(int i=0; i < delay * 4; i++){
1518
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1519
if(ret == -1){
1520
perror("ioctl SIOCGIFFLAGS");
1521
} else if(network.ifr_flags & IFF_RUNNING){
1522
break;
1523
}
1524
struct timespec sleeptime = { .tv_nsec = 250000000 };
1525
ret = nanosleep(&sleeptime, NULL);
1526
if(ret == -1 and errno != EINTR){
1527
perror("nanosleep");
1528
}
1529
}
1530
if(not take_down_interface){
1531
/* We won't need the socket anymore */
1532
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1533
if(ret == -1){
1534
perror("close");
1535
}
1536
}
1537
#ifdef __linux__
1538
if(restore_loglevel){
1539
/* Restores kernel loglevel to default */
1540
ret = klogctl(7, NULL, 0);
1541
if(ret == -1){
1542
perror("klogctl");
1543
}
1544
}
1545
#endif /* __linux__ */
1546
/* Lower privileges */
1547
errno = 0;
1548
if(take_down_interface){
1549
/* Lower privileges */
1550
ret = seteuid(uid);
1551
if(ret == -1){
1552
perror("seteuid");
1553
}
1554
} else {
1555
/* Lower privileges permanently */
1556
ret = setuid(uid);
1557
if(ret == -1){
1558
perror("setuid");
1559
}
1560
}
1561
}
1562
1563
if(quit_now){
1564
goto end;
1565
}
1566
1567
ret = init_gnutls_global(pubkey, seckey);
1568
if(ret == -1){
1569
fprintf(stderr, "init_gnutls_global failed\n");
1570
exitcode = EX_UNAVAILABLE;
1571
goto end;
1572
} else {
1573
gnutls_initialized = true;
1574
}
1575
1576
if(quit_now){
1577
goto end;
1578
}
1579
1580
if(mkdtemp(tempdir) == NULL){
1581
perror("mkdtemp");
1582
goto end;
1583
}
1584
tempdir_created = true;
1585
1586
if(quit_now){
1587
goto end;
1588
}
1589
1590
if(not init_gpgme(pubkey, seckey, tempdir)){
1591
fprintf(stderr, "init_gpgme failed\n");
1592
exitcode = EX_UNAVAILABLE;
1593
goto end;
1594
} else {
1595
gpgme_initialized = true;
1596
}
1597
1598
if(quit_now){
1599
goto end;
1600
}
1601
1602
if(connect_to != NULL){
1603
/* Connect directly, do not use Zeroconf */
1604
/* (Mainly meant for debugging) */
1605
char *address = strrchr(connect_to, ':');
1606
if(address == NULL){
1607
fprintf(stderr, "No colon in address\n");
1608
exitcode = EX_USAGE;
1609
goto end;
1610
}
1611
1612
if(quit_now){
1613
goto end;
1614
}
1615
1616
uint16_t port;
1617
errno = 0;
1618
tmpmax = strtoimax(address+1, &tmp, 10);
1619
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1620
or tmpmax != (uint16_t)tmpmax){
1621
fprintf(stderr, "Bad port number\n");
1622
exitcode = EX_USAGE;
1623
goto end;
1624
}
1625
1626
if(quit_now){
1627
goto end;
1628
}
1629
1630
port = (uint16_t)tmpmax;
1631
*address = '\0';
1632
address = connect_to;
1633
/* Colon in address indicates IPv6 */
1634
int af;
1635
if(strchr(address, ':') != NULL){
1636
af = AF_INET6;
1637
} else {
1638
af = AF_INET;
1639
}
1640
1641
if(quit_now){
1642
goto end;
1643
}
1644
1645
while(not quit_now){
1646
ret = start_mandos_communication(address, port, if_index, af);
1647
if(quit_now or ret == 0){
1648
break;
1649
}
1650
sleep(15);
1651
};
1652
1653
if (not quit_now){
1654
exitcode = EXIT_SUCCESS;
1655
}
1656
1657
goto end;
1658
}
1659
1660
if(quit_now){
1661
goto end;
1662
}
1663
1664
{
1665
AvahiServerConfig config;
1666
/* Do not publish any local Zeroconf records */
1667
avahi_server_config_init(&config);
1668
config.publish_hinfo = 0;
1669
config.publish_addresses = 0;
1670
config.publish_workstation = 0;
1671
config.publish_domain = 0;
1672
1673
/* Allocate a new server */
1674
mc.server = avahi_server_new(avahi_simple_poll_get
1675
(mc.simple_poll), &config, NULL,
1676
NULL, &error);
1677
1678
/* Free the Avahi configuration data */
1679
avahi_server_config_free(&config);
1680
}
1681
1682
/* Check if creating the Avahi server object succeeded */
1683
if(mc.server == NULL){
1684
fprintf(stderr, "Failed to create Avahi server: %s\n",
1685
avahi_strerror(error));
1686
exitcode = EX_UNAVAILABLE;
1687
goto end;
1688
}
1689
1690
if(quit_now){
1691
goto end;
1692
}
1693
1694
/* Create the Avahi service browser */
1695
sb = avahi_s_service_browser_new(mc.server, if_index,
1696
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1697
NULL, 0, browse_callback, NULL);
1698
if(sb == NULL){
1699
fprintf(stderr, "Failed to create service browser: %s\n",
1700
avahi_strerror(avahi_server_errno(mc.server)));
1701
exitcode = EX_UNAVAILABLE;
1702
goto end;
1703
}
1704
1705
if(quit_now){
1706
goto end;
1707
}
1708
1709
/* Run the main loop */
1710
1711
if(debug){
1712
fprintf(stderr, "Starting Avahi loop search\n");
1713
}
1714
1715
avahi_simple_poll_loop(mc.simple_poll);
1716
1083
1717
end:
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){
1115
perror("opendir");
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;
1718
1719
if(debug){
1720
fprintf(stderr, "%s exiting\n", argv[0]);
1721
}
1722
1723
/* Cleanup things */
1724
if(sb != NULL)
1725
avahi_s_service_browser_free(sb);
1726
1727
if(mc.server != NULL)
1728
avahi_server_free(mc.server);
1729
1730
if(mc.simple_poll != NULL)
1731
avahi_simple_poll_free(mc.simple_poll);
1732
1733
if(gnutls_initialized){
1734
gnutls_certificate_free_credentials(mc.cred);
1735
gnutls_global_deinit();
1736
gnutls_dh_params_deinit(mc.dh_params);
1737
}
1738
1739
if(gpgme_initialized){
1740
gpgme_release(mc.ctx);
1741
}
1742
1743
/* Take down the network interface */
1744
if(take_down_interface){
1745
/* Re-raise priviliges */
1746
errno = 0;
1747
ret = seteuid(0);
1748
if(ret == -1){
1749
perror("seteuid");
1750
}
1751
if(geteuid() == 0){
1752
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1753
if(ret == -1){
1754
perror("ioctl SIOCGIFFLAGS");
1755
} else if(network.ifr_flags & IFF_UP) {
1756
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1757
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1758
if(ret == -1){
1759
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1760
}
1761
}
1762
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1763
if(ret == -1){
1764
perror("close");
1765
}
1766
/* Lower privileges permanently */
1767
errno = 0;
1768
ret = setuid(uid);
1769
if(ret == -1){
1770
perror("setuid");
1771
}
1772
}
1773
}
1774
1775
/* Removes the GPGME temp directory and all files inside */
1776
if(tempdir_created){
1777
struct dirent **direntries = NULL;
1778
struct dirent *direntry = NULL;
1779
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1780
if (ret > 0){
1781
for(int i = 0; i < ret; i++){
1782
direntry = direntries[i];
1783
char *fullname = NULL;
1784
ret = asprintf(&fullname, "%s/%s", tempdir,
1785
direntry->d_name);
1786
if(ret < 0){
1787
perror("asprintf");
1788
continue;
1789
}
1790
ret = remove(fullname);
1791
if(ret == -1){
1792
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1793
strerror(errno));
1794
}
1795
free(fullname);
1796
}
1797
}
1798
1799
/* need to be cleaned even if ret == 0 because man page dont specify */
1800
free(direntries);
1801
if (ret == -1){
1802
perror("scandir");
1803
}
1804
ret = rmdir(tempdir);
1805
if(ret == -1 and errno != ENOENT){
1806
perror("rmdir");
1807
}
1808
}
1809
1810
if(quit_now){
1811
sigemptyset(&old_sigterm_action.sa_mask);
1812
old_sigterm_action.sa_handler = SIG_DFL;
1813
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1814
&old_sigterm_action,
1815
NULL));
1816
if(ret == -1){
1817
perror("sigaction");
1818
}
1819
do {
1820
ret = raise(signal_received);
1821
} while(ret != 0 and errno == EINTR);
1822
if(ret != 0){
1823
perror("raise");
1824
abort();
1825
}
1826
TEMP_FAILURE_RETRY(pause());
1827
}
1828
1829
return exitcode;
1147
1830
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0