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- Committer: Teddy Hogeborn
- Date: 2009-08-30 03:10:29 UTC
- Revision ID: teddy@fukt.bsnet.se-20090830031029-cj8po3rc4g1cux1d
* mandos: White-space fixes only.
* mandos-ctl: - '' -
* plugin-runner.c: - '' -
* plugins.d/askpass-fifo.c: - '' -
* plugins.d/mandos-client.c: - '' -
* plugins.d/password-prompt.c: - '' -
* mandos-ctl: - '' -
* plugin-runner.c: - '' -
* plugins.d/askpass-fifo.c: - '' -
* plugins.d/mandos-client.c: - '' -
* plugins.d/password-prompt.c: - '' -
- files added:
- debian/watch
- files removed:
- debian/mandos-client.config
- files modified:
- INSTALL
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 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
47
srand(), strtof() */
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() */
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
74
getuid(), getgid(), setuid(),
67
75
setgid() */
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
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
74
89
75
90
/* Avahi */
76
91
/* All Avahi types, constants and functions
89
104
gnutls_*
90
105
init_gnutls_session(),
91
106
GNUTLS_* */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
93
109
GNUTLS_OPENPGP_FMT_BASE64 */
94
110
95
111
/* GPGME */
121
137
gpgme_ctx_t ctx;
122
138
} mandos_context;
123
139
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
144
124
145
/*
125
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
126
* "buffer_capacity" is how much is currently allocated,
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
127
148
* "buffer_length" is how much is already used.
128
149
*/
129
size_t adjustbuffer(char **buffer, size_t buffer_length,
150
size_t incbuffer(char **buffer, size_t buffer_length,
130
151
size_t buffer_capacity){
131
if (buffer_length + BUFFER_SIZE > buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
132
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
133
if (buffer == NULL){
154
if(buffer == NULL){
134
155
return 0;
135
156
}
136
157
buffer_capacity += BUFFER_SIZE;
141
162
/*
142
163
* Initialize GPGME.
143
164
*/
144
static bool init_gpgme(mandos_context *mc, const char *seckey,
165
static bool init_gpgme(const char *seckey,
145
166
const char *pubkey, const char *tempdir){
146
167
int ret;
147
168
gpgme_error_t rc;
149
170
150
171
151
172
/*
152
* Helper function to insert pub and seckey to the enigne keyring.
173
* Helper function to insert pub and seckey to the engine keyring.
153
174
*/
154
175
bool import_key(const char *filename){
155
176
int fd;
156
177
gpgme_data_t pgp_data;
157
178
158
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
159
180
if(fd == -1){
160
181
perror("open");
161
182
return false;
162
183
}
163
184
164
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
165
if (rc != GPG_ERR_NO_ERROR){
186
if(rc != GPG_ERR_NO_ERROR){
166
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
167
188
gpgme_strsource(rc), gpgme_strerror(rc));
168
189
return false;
169
190
}
170
191
171
rc = gpgme_op_import(mc->ctx, pgp_data);
172
if (rc != GPG_ERR_NO_ERROR){
192
rc = gpgme_op_import(mc.ctx, pgp_data);
193
if(rc != GPG_ERR_NO_ERROR){
173
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
174
195
gpgme_strsource(rc), gpgme_strerror(rc));
175
196
return false;
176
197
}
177
198
178
ret = TEMP_FAILURE_RETRY(close(fd));
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
179
200
if(ret == -1){
180
201
perror("close");
181
202
}
183
204
return true;
184
205
}
185
206
186
if (debug){
187
fprintf(stderr, "Initialize gpgme\n");
207
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
188
209
}
189
210
190
211
/* Init GPGME */
191
212
gpgme_check_version(NULL);
192
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
193
if (rc != GPG_ERR_NO_ERROR){
214
if(rc != GPG_ERR_NO_ERROR){
194
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
195
216
gpgme_strsource(rc), gpgme_strerror(rc));
196
217
return false;
197
218
}
198
219
199
220
/* Set GPGME home directory for the OpenPGP engine only */
200
rc = gpgme_get_engine_info (&engine_info);
201
if (rc != GPG_ERR_NO_ERROR){
221
rc = gpgme_get_engine_info(&engine_info);
222
if(rc != GPG_ERR_NO_ERROR){
202
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
203
224
gpgme_strsource(rc), gpgme_strerror(rc));
204
225
return false;
217
238
}
218
239
219
240
/* Create new GPGME "context" */
220
rc = gpgme_new(&(mc->ctx));
221
if (rc != GPG_ERR_NO_ERROR){
241
rc = gpgme_new(&(mc.ctx));
242
if(rc != GPG_ERR_NO_ERROR){
222
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
223
244
gpgme_strsource(rc), gpgme_strerror(rc));
224
245
return false;
225
246
}
226
247
227
if (not import_key(pubkey) or not import_key(seckey)){
248
if(not import_key(pubkey) or not import_key(seckey)){
228
249
return false;
229
250
}
230
251
231
return true;
252
return true;
232
253
}
233
254
234
255
/*
235
256
* Decrypt OpenPGP data.
236
257
* Returns -1 on error
237
258
*/
238
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
239
const char *cryptotext,
240
size_t crypto_size,
241
char **plaintext){
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
size_t crypto_size,
261
char **plaintext){
242
262
gpgme_data_t dh_crypto, dh_plain;
243
263
gpgme_error_t rc;
244
264
ssize_t ret;
245
265
size_t plaintext_capacity = 0;
246
266
ssize_t plaintext_length = 0;
247
267
248
if (debug){
268
if(debug){
249
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
250
270
}
251
271
252
272
/* Create new GPGME data buffer from memory cryptotext */
253
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
254
274
0);
255
if (rc != GPG_ERR_NO_ERROR){
275
if(rc != GPG_ERR_NO_ERROR){
256
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
257
277
gpgme_strsource(rc), gpgme_strerror(rc));
258
278
return -1;
260
280
261
281
/* Create new empty GPGME data buffer for the plaintext */
262
282
rc = gpgme_data_new(&dh_plain);
263
if (rc != GPG_ERR_NO_ERROR){
283
if(rc != GPG_ERR_NO_ERROR){
264
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
265
285
gpgme_strsource(rc), gpgme_strerror(rc));
266
286
gpgme_data_release(dh_crypto);
269
289
270
290
/* Decrypt data from the cryptotext data buffer to the plaintext
271
291
data buffer */
272
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
273
if (rc != GPG_ERR_NO_ERROR){
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
274
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
275
295
gpgme_strsource(rc), gpgme_strerror(rc));
276
296
plaintext_length = -1;
277
if (debug){
297
if(debug){
278
298
gpgme_decrypt_result_t result;
279
result = gpgme_op_decrypt_result(mc->ctx);
280
if (result == NULL){
299
result = gpgme_op_decrypt_result(mc.ctx);
300
if(result == NULL){
281
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
282
302
} else {
283
303
fprintf(stderr, "Unsupported algorithm: %s\n",
289
309
}
290
310
gpgme_recipient_t recipient;
291
311
recipient = result->recipients;
292
if(recipient){
293
while(recipient != NULL){
294
fprintf(stderr, "Public key algorithm: %s\n",
295
gpgme_pubkey_algo_name(recipient->pubkey_algo));
296
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
297
fprintf(stderr, "Secret key available: %s\n",
298
recipient->status == GPG_ERR_NO_SECKEY
299
? "No" : "Yes");
300
recipient = recipient->next;
301
}
312
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
319
recipient = recipient->next;
302
320
}
303
321
}
304
322
}
310
328
}
311
329
312
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
313
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
314
332
perror("gpgme_data_seek");
315
333
plaintext_length = -1;
316
334
goto decrypt_end;
318
336
319
337
*plaintext = NULL;
320
338
while(true){
321
plaintext_capacity = adjustbuffer(plaintext,
339
plaintext_capacity = incbuffer(plaintext,
322
340
(size_t)plaintext_length,
323
341
plaintext_capacity);
324
if (plaintext_capacity == 0){
325
perror("adjustbuffer");
342
if(plaintext_capacity == 0){
343
perror("incbuffer");
326
344
plaintext_length = -1;
327
345
goto decrypt_end;
328
346
}
330
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
331
349
BUFFER_SIZE);
332
350
/* Print the data, if any */
333
if (ret == 0){
351
if(ret == 0){
334
352
/* EOF */
335
353
break;
336
354
}
360
378
return plaintext_length;
361
379
}
362
380
363
static const char * safer_gnutls_strerror (int value) {
364
const char *ret = gnutls_strerror (value); /* Spurious warning */
365
if (ret == NULL)
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
384
if(ret == NULL)
366
385
ret = "(unknown)";
367
386
return ret;
368
387
}
373
392
fprintf(stderr, "GnuTLS: %s", string);
374
393
}
375
394
376
static int init_gnutls_global(mandos_context *mc,
377
const char *pubkeyfilename,
395
static int init_gnutls_global(const char *pubkeyfilename,
378
396
const char *seckeyfilename){
379
397
int ret;
380
398
383
401
}
384
402
385
403
ret = gnutls_global_init();
386
if (ret != GNUTLS_E_SUCCESS) {
387
fprintf (stderr, "GnuTLS global_init: %s\n",
388
safer_gnutls_strerror(ret));
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
389
407
return -1;
390
408
}
391
409
392
if (debug){
410
if(debug){
393
411
/* "Use a log level over 10 to enable all debugging options."
394
412
* - GnuTLS manual
395
413
*/
398
416
}
399
417
400
418
/* OpenPGP credentials */
401
gnutls_certificate_allocate_credentials(&mc->cred);
402
if (ret != GNUTLS_E_SUCCESS){
403
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
404
warning */
405
safer_gnutls_strerror(ret));
406
gnutls_global_deinit ();
419
gnutls_certificate_allocate_credentials(&mc.cred);
420
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
426
gnutls_global_deinit();
407
427
return -1;
408
428
}
409
429
414
434
}
415
435
416
436
ret = gnutls_certificate_set_openpgp_key_file
417
(mc->cred, pubkeyfilename, seckeyfilename,
437
(mc.cred, pubkeyfilename, seckeyfilename,
418
438
GNUTLS_OPENPGP_FMT_BASE64);
419
if (ret != GNUTLS_E_SUCCESS) {
439
if(ret != GNUTLS_E_SUCCESS){
420
440
fprintf(stderr,
421
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
422
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
426
446
}
427
447
428
448
/* GnuTLS server initialization */
429
ret = gnutls_dh_params_init(&mc->dh_params);
430
if (ret != GNUTLS_E_SUCCESS) {
431
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
432
" %s\n", safer_gnutls_strerror(ret));
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
433
453
goto globalfail;
434
454
}
435
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
436
if (ret != GNUTLS_E_SUCCESS) {
437
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
438
safer_gnutls_strerror(ret));
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
439
459
goto globalfail;
440
460
}
441
461
442
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
443
463
444
464
return 0;
445
465
446
466
globalfail:
447
467
448
gnutls_certificate_free_credentials(mc->cred);
468
gnutls_certificate_free_credentials(mc.cred);
449
469
gnutls_global_deinit();
450
gnutls_dh_params_deinit(mc->dh_params);
470
gnutls_dh_params_deinit(mc.dh_params);
451
471
return -1;
452
472
}
453
473
454
static int init_gnutls_session(mandos_context *mc,
455
gnutls_session_t *session){
474
static int init_gnutls_session(gnutls_session_t *session){
456
475
int ret;
457
476
/* GnuTLS session creation */
458
477
ret = gnutls_init(session, GNUTLS_SERVER);
459
if (ret != GNUTLS_E_SUCCESS){
478
if(ret != GNUTLS_E_SUCCESS){
460
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
461
480
safer_gnutls_strerror(ret));
462
481
}
463
482
464
483
{
465
484
const char *err;
466
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
467
if (ret != GNUTLS_E_SUCCESS) {
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
486
if(ret != GNUTLS_E_SUCCESS){
468
487
fprintf(stderr, "Syntax error at: %s\n", err);
469
488
fprintf(stderr, "GnuTLS error: %s\n",
470
489
safer_gnutls_strerror(ret));
471
gnutls_deinit (*session);
490
gnutls_deinit(*session);
472
491
return -1;
473
492
}
474
493
}
475
494
476
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
477
mc->cred);
478
if (ret != GNUTLS_E_SUCCESS) {
496
mc.cred);
497
if(ret != GNUTLS_E_SUCCESS){
479
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
480
499
safer_gnutls_strerror(ret));
481
gnutls_deinit (*session);
500
gnutls_deinit(*session);
482
501
return -1;
483
502
}
484
503
485
504
/* ignore client certificate if any. */
486
gnutls_certificate_server_set_request (*session,
487
GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
488
507
489
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
490
509
491
510
return 0;
492
511
}
495
514
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
496
515
__attribute__((unused)) const char *txt){}
497
516
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
498
520
/* Called when a Mandos server is found */
499
521
static int start_mandos_communication(const char *ip, uint16_t port,
500
522
AvahiIfIndex if_index,
501
mandos_context *mc){
523
int af){
502
524
int ret, tcp_sd;
503
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
525
ssize_t sret;
526
union {
527
struct sockaddr_in in;
528
struct sockaddr_in6 in6;
529
} to;
504
530
char *buffer = NULL;
505
531
char *decrypted_buffer;
506
532
size_t buffer_length = 0;
508
534
ssize_t decrypted_buffer_size;
509
535
size_t written;
510
536
int retval = 0;
511
char interface[IF_NAMESIZE];
512
537
gnutls_session_t session;
513
514
ret = init_gnutls_session (mc, &session);
515
if (ret != 0){
538
int pf; /* Protocol family */
539
540
switch(af){
541
case AF_INET6:
542
pf = PF_INET6;
543
break;
544
case AF_INET:
545
pf = PF_INET;
546
break;
547
default:
548
fprintf(stderr, "Bad address family: %d\n", af);
549
return -1;
550
}
551
552
ret = init_gnutls_session(&session);
553
if(ret != 0){
516
554
return -1;
517
555
}
518
556
519
557
if(debug){
520
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
558
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
521
559
"\n", ip, port);
522
560
}
523
561
524
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
525
if(tcp_sd < 0) {
562
tcp_sd = socket(pf, SOCK_STREAM, 0);
563
if(tcp_sd < 0){
526
564
perror("socket");
527
565
return -1;
528
566
}
529
567
530
if(debug){
531
if(if_indextoname((unsigned int)if_index, interface) == NULL){
532
perror("if_indextoname");
533
return -1;
534
}
535
fprintf(stderr, "Binding to interface %s\n", interface);
536
}
537
538
568
memset(&to, 0, sizeof(to));
539
to.in6.sin6_family = AF_INET6;
540
/* It would be nice to have a way to detect if we were passed an
541
IPv4 address here. Now we assume an IPv6 address. */
542
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
543
if (ret < 0 ){
569
if(af == AF_INET6){
570
to.in6.sin6_family = (sa_family_t)af;
571
ret = inet_pton(af, ip, &to.in6.sin6_addr);
572
} else { /* IPv4 */
573
to.in.sin_family = (sa_family_t)af;
574
ret = inet_pton(af, ip, &to.in.sin_addr);
575
}
576
if(ret < 0 ){
544
577
perror("inet_pton");
545
578
return -1;
546
579
}
548
581
fprintf(stderr, "Bad address: %s\n", ip);
549
582
return -1;
550
583
}
551
to.in6.sin6_port = htons(port); /* Spurious warning */
552
553
to.in6.sin6_scope_id = (uint32_t)if_index;
584
if(af == AF_INET6){
585
to.in6.sin6_port = htons(port); /* Spurious warnings from
586
-Wconversion and
587
-Wunreachable-code */
588
589
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
590
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
591
-Wunreachable-code*/
592
if(if_index == AVAHI_IF_UNSPEC){
593
fprintf(stderr, "An IPv6 link-local address is incomplete"
594
" without a network interface\n");
595
return -1;
596
}
597
/* Set the network interface number as scope */
598
to.in6.sin6_scope_id = (uint32_t)if_index;
599
}
600
} else {
601
to.in.sin_port = htons(port); /* Spurious warnings from
602
-Wconversion and
603
-Wunreachable-code */
604
}
554
605
555
606
if(debug){
556
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
557
port);
558
char addrstr[INET6_ADDRSTRLEN] = "";
559
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
560
sizeof(addrstr)) == NULL){
607
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
608
char interface[IF_NAMESIZE];
609
if(if_indextoname((unsigned int)if_index, interface) == NULL){
610
perror("if_indextoname");
611
} else {
612
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
613
ip, interface, port);
614
}
615
} else {
616
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
617
port);
618
}
619
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
620
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
621
const char *pcret;
622
if(af == AF_INET6){
623
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
624
sizeof(addrstr));
625
} else {
626
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
627
sizeof(addrstr));
628
}
629
if(pcret == NULL){
561
630
perror("inet_ntop");
562
631
} else {
563
632
if(strcmp(addrstr, ip) != 0){
566
635
}
567
636
}
568
637
569
ret = connect(tcp_sd, &to.in, sizeof(to));
570
if (ret < 0){
638
if(af == AF_INET6){
639
ret = connect(tcp_sd, &to.in6, sizeof(to));
640
} else {
641
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
642
}
643
if(ret < 0){
571
644
perror("connect");
572
645
return -1;
573
646
}
574
647
575
648
const char *out = mandos_protocol_version;
576
649
written = 0;
577
while (true){
650
while(true){
578
651
size_t out_size = strlen(out);
579
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
652
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
580
653
out_size - written));
581
if (ret == -1){
654
if(ret == -1){
582
655
perror("write");
583
656
retval = -1;
584
657
goto mandos_end;
587
660
if(written < out_size){
588
661
continue;
589
662
} else {
590
if (out == mandos_protocol_version){
663
if(out == mandos_protocol_version){
591
664
written = 0;
592
665
out = "\r\n";
593
666
} else {
600
673
fprintf(stderr, "Establishing TLS session with %s\n", ip);
601
674
}
602
675
603
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
676
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
604
677
605
678
do{
606
ret = gnutls_handshake (session);
679
ret = gnutls_handshake(session);
607
680
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
608
681
609
if (ret != GNUTLS_E_SUCCESS){
682
if(ret != GNUTLS_E_SUCCESS){
610
683
if(debug){
611
684
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
612
gnutls_perror (ret);
685
gnutls_perror(ret);
613
686
}
614
687
retval = -1;
615
688
goto mandos_end;
618
691
/* Read OpenPGP packet that contains the wanted password */
619
692
620
693
if(debug){
621
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
694
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
622
695
ip);
623
696
}
624
697
625
698
while(true){
626
buffer_capacity = adjustbuffer(&buffer, buffer_length,
699
buffer_capacity = incbuffer(&buffer, buffer_length,
627
700
buffer_capacity);
628
if (buffer_capacity == 0){
629
perror("adjustbuffer");
701
if(buffer_capacity == 0){
702
perror("incbuffer");
630
703
retval = -1;
631
704
goto mandos_end;
632
705
}
633
706
634
ret = gnutls_record_recv(session, buffer+buffer_length,
635
BUFFER_SIZE);
636
if (ret == 0){
707
sret = gnutls_record_recv(session, buffer+buffer_length,
708
BUFFER_SIZE);
709
if(sret == 0){
637
710
break;
638
711
}
639
if (ret < 0){
640
switch(ret){
712
if(sret < 0){
713
switch(sret){
641
714
case GNUTLS_E_INTERRUPTED:
642
715
case GNUTLS_E_AGAIN:
643
716
break;
644
717
case GNUTLS_E_REHANDSHAKE:
645
718
do{
646
ret = gnutls_handshake (session);
719
ret = gnutls_handshake(session);
647
720
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
648
if (ret < 0){
721
if(ret < 0){
649
722
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
650
gnutls_perror (ret);
723
gnutls_perror(ret);
651
724
retval = -1;
652
725
goto mandos_end;
653
726
}
656
729
fprintf(stderr, "Unknown error while reading data from"
657
730
" encrypted session with Mandos server\n");
658
731
retval = -1;
659
gnutls_bye (session, GNUTLS_SHUT_RDWR);
732
gnutls_bye(session, GNUTLS_SHUT_RDWR);
660
733
goto mandos_end;
661
734
}
662
735
} else {
663
buffer_length += (size_t) ret;
736
buffer_length += (size_t) sret;
664
737
}
665
738
}
666
739
668
741
fprintf(stderr, "Closing TLS session\n");
669
742
}
670
743
671
gnutls_bye (session, GNUTLS_SHUT_RDWR);
744
gnutls_bye(session, GNUTLS_SHUT_RDWR);
672
745
673
if (buffer_length > 0){
674
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
746
if(buffer_length > 0){
747
decrypted_buffer_size = pgp_packet_decrypt(buffer,
675
748
buffer_length,
676
749
&decrypted_buffer);
677
if (decrypted_buffer_size >= 0){
750
if(decrypted_buffer_size >= 0){
678
751
written = 0;
679
752
while(written < (size_t) decrypted_buffer_size){
680
ret = (int)fwrite (decrypted_buffer + written, 1,
681
(size_t)decrypted_buffer_size - written,
682
stdout);
753
ret = (int)fwrite(decrypted_buffer + written, 1,
754
(size_t)decrypted_buffer_size - written,
755
stdout);
683
756
if(ret == 0 and ferror(stdout)){
684
757
if(debug){
685
758
fprintf(stderr, "Error writing encrypted data: %s\n",
702
775
703
776
mandos_end:
704
777
free(buffer);
705
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
778
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
706
779
if(ret == -1){
707
780
perror("close");
708
781
}
709
gnutls_deinit (session);
782
gnutls_deinit(session);
710
783
return retval;
711
784
}
712
785
713
786
static void resolve_callback(AvahiSServiceResolver *r,
714
787
AvahiIfIndex interface,
715
AVAHI_GCC_UNUSED AvahiProtocol protocol,
788
AvahiProtocol proto,
716
789
AvahiResolverEvent event,
717
790
const char *name,
718
791
const char *type,
723
796
AVAHI_GCC_UNUSED AvahiStringList *txt,
724
797
AVAHI_GCC_UNUSED AvahiLookupResultFlags
725
798
flags,
726
void* userdata) {
727
mandos_context *mc = userdata;
799
AVAHI_GCC_UNUSED void* userdata){
728
800
assert(r);
729
801
730
802
/* Called whenever a service has been resolved successfully or
731
803
timed out */
732
804
733
switch (event) {
805
if(quit_now){
806
return;
807
}
808
809
switch(event){
734
810
default:
735
811
case AVAHI_RESOLVER_FAILURE:
736
812
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
737
813
" of type '%s' in domain '%s': %s\n", name, type, domain,
738
avahi_strerror(avahi_server_errno(mc->server)));
814
avahi_strerror(avahi_server_errno(mc.server)));
739
815
break;
740
816
741
817
case AVAHI_RESOLVER_FOUND:
744
820
avahi_address_snprint(ip, sizeof(ip), address);
745
821
if(debug){
746
822
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
747
PRIu16 ") on port %d\n", name, host_name, ip,
748
interface, port);
823
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
824
ip, (intmax_t)interface, port);
749
825
}
750
int ret = start_mandos_communication(ip, port, interface, mc);
751
if (ret == 0){
752
avahi_simple_poll_quit(mc->simple_poll);
826
int ret = start_mandos_communication(ip, port, interface,
827
avahi_proto_to_af(proto));
828
if(ret == 0){
829
avahi_simple_poll_quit(mc.simple_poll);
753
830
}
754
831
}
755
832
}
756
833
avahi_s_service_resolver_free(r);
757
834
}
758
835
759
static void browse_callback( AvahiSServiceBrowser *b,
760
AvahiIfIndex interface,
761
AvahiProtocol protocol,
762
AvahiBrowserEvent event,
763
const char *name,
764
const char *type,
765
const char *domain,
766
AVAHI_GCC_UNUSED AvahiLookupResultFlags
767
flags,
768
void* userdata) {
769
mandos_context *mc = userdata;
836
static void browse_callback(AvahiSServiceBrowser *b,
837
AvahiIfIndex interface,
838
AvahiProtocol protocol,
839
AvahiBrowserEvent event,
840
const char *name,
841
const char *type,
842
const char *domain,
843
AVAHI_GCC_UNUSED AvahiLookupResultFlags
844
flags,
845
AVAHI_GCC_UNUSED void* userdata){
770
846
assert(b);
771
847
772
848
/* Called whenever a new services becomes available on the LAN or
773
849
is removed from the LAN */
774
850
775
switch (event) {
851
switch(event){
776
852
default:
777
853
case AVAHI_BROWSER_FAILURE:
778
854
779
855
fprintf(stderr, "(Avahi browser) %s\n",
780
avahi_strerror(avahi_server_errno(mc->server)));
781
avahi_simple_poll_quit(mc->simple_poll);
856
avahi_strerror(avahi_server_errno(mc.server)));
857
avahi_simple_poll_quit(mc.simple_poll);
782
858
return;
783
859
784
860
case AVAHI_BROWSER_NEW:
787
863
the callback function is called the Avahi server will free the
788
864
resolver for us. */
789
865
790
if (!(avahi_s_service_resolver_new(mc->server, interface,
791
protocol, name, type, domain,
792
AVAHI_PROTO_INET6, 0,
793
resolve_callback, mc)))
866
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
867
name, type, domain, protocol, 0,
868
resolve_callback, NULL) == NULL)
794
869
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
795
name, avahi_strerror(avahi_server_errno(mc->server)));
870
name, avahi_strerror(avahi_server_errno(mc.server)));
796
871
break;
797
872
798
873
case AVAHI_BROWSER_REMOVE:
807
882
}
808
883
}
809
884
885
/* stop main loop after sigterm has been called */
886
static void handle_sigterm(int sig){
887
if(quit_now){
888
return;
889
}
890
quit_now = 1;
891
signal_received = sig;
892
int old_errno = errno;
893
if(mc.simple_poll != NULL){
894
avahi_simple_poll_quit(mc.simple_poll);
895
}
896
errno = old_errno;
897
}
898
810
899
int main(int argc, char *argv[]){
811
AvahiSServiceBrowser *sb = NULL;
812
int error;
813
int ret;
814
int exitcode = EXIT_SUCCESS;
815
const char *interface = "eth0";
816
struct ifreq network;
817
int sd;
818
uid_t uid;
819
gid_t gid;
820
char *connect_to = NULL;
821
char tempdir[] = "/tmp/mandosXXXXXX";
822
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
823
const char *seckey = PATHDIR "/" SECKEY;
824
const char *pubkey = PATHDIR "/" PUBKEY;
825
826
mandos_context mc = { .simple_poll = NULL, .server = NULL,
827
.dh_bits = 1024, .priority = "SECURE256"
828
":!CTYPE-X.509:+CTYPE-OPENPGP" };
829
bool gnutls_initalized = false;
830
bool gpgme_initalized = false;
831
832
{
833
struct argp_option options[] = {
834
{ .name = "debug", .key = 128,
835
.doc = "Debug mode", .group = 3 },
836
{ .name = "connect", .key = 'c',
837
.arg = "ADDRESS:PORT",
838
.doc = "Connect directly to a specific Mandos server",
839
.group = 1 },
840
{ .name = "interface", .key = 'i',
841
.arg = "NAME",
842
.doc = "Interface that will be used to search for Mandos"
843
" servers",
844
.group = 1 },
845
{ .name = "seckey", .key = 's',
846
.arg = "FILE",
847
.doc = "OpenPGP secret key file base name",
848
.group = 1 },
849
{ .name = "pubkey", .key = 'p',
850
.arg = "FILE",
851
.doc = "OpenPGP public key file base name",
852
.group = 2 },
853
{ .name = "dh-bits", .key = 129,
854
.arg = "BITS",
855
.doc = "Bit length of the prime number used in the"
856
" Diffie-Hellman key exchange",
857
.group = 2 },
858
{ .name = "priority", .key = 130,
859
.arg = "STRING",
860
.doc = "GnuTLS priority string for the TLS handshake",
861
.group = 1 },
862
{ .name = NULL }
863
};
864
865
error_t parse_opt (int key, char *arg,
866
struct argp_state *state) {
867
/* Get the INPUT argument from `argp_parse', which we know is
868
a pointer to our plugin list pointer. */
869
switch (key) {
870
case 128: /* --debug */
871
debug = true;
872
break;
873
case 'c': /* --connect */
874
connect_to = arg;
875
break;
876
case 'i': /* --interface */
877
interface = arg;
878
break;
879
case 's': /* --seckey */
880
seckey = arg;
881
break;
882
case 'p': /* --pubkey */
883
pubkey = arg;
884
break;
885
case 129: /* --dh-bits */
886
errno = 0;
887
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
888
if (errno){
889
perror("strtol");
890
exit(EXIT_FAILURE);
900
AvahiSServiceBrowser *sb = NULL;
901
int error;
902
int ret;
903
intmax_t tmpmax;
904
char *tmp;
905
int exitcode = EXIT_SUCCESS;
906
const char *interface = "eth0";
907
struct ifreq network;
908
int sd = -1;
909
bool take_down_interface = false;
910
uid_t uid;
911
gid_t gid;
912
char *connect_to = NULL;
913
char tempdir[] = "/tmp/mandosXXXXXX";
914
bool tempdir_created = false;
915
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
916
const char *seckey = PATHDIR "/" SECKEY;
917
const char *pubkey = PATHDIR "/" PUBKEY;
918
919
bool gnutls_initialized = false;
920
bool gpgme_initialized = false;
921
float delay = 2.5f;
922
923
struct sigaction old_sigterm_action;
924
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
925
926
{
927
struct argp_option options[] = {
928
{ .name = "debug", .key = 128,
929
.doc = "Debug mode", .group = 3 },
930
{ .name = "connect", .key = 'c',
931
.arg = "ADDRESS:PORT",
932
.doc = "Connect directly to a specific Mandos server",
933
.group = 1 },
934
{ .name = "interface", .key = 'i',
935
.arg = "NAME",
936
.doc = "Network interface that will be used to search for"
937
" Mandos servers",
938
.group = 1 },
939
{ .name = "seckey", .key = 's',
940
.arg = "FILE",
941
.doc = "OpenPGP secret key file base name",
942
.group = 1 },
943
{ .name = "pubkey", .key = 'p',
944
.arg = "FILE",
945
.doc = "OpenPGP public key file base name",
946
.group = 2 },
947
{ .name = "dh-bits", .key = 129,
948
.arg = "BITS",
949
.doc = "Bit length of the prime number used in the"
950
" Diffie-Hellman key exchange",
951
.group = 2 },
952
{ .name = "priority", .key = 130,
953
.arg = "STRING",
954
.doc = "GnuTLS priority string for the TLS handshake",
955
.group = 1 },
956
{ .name = "delay", .key = 131,
957
.arg = "SECONDS",
958
.doc = "Maximum delay to wait for interface startup",
959
.group = 2 },
960
{ .name = NULL }
961
};
962
963
error_t parse_opt(int key, char *arg,
964
struct argp_state *state){
965
switch(key){
966
case 128: /* --debug */
967
debug = true;
968
break;
969
case 'c': /* --connect */
970
connect_to = arg;
971
break;
972
case 'i': /* --interface */
973
interface = arg;
974
break;
975
case 's': /* --seckey */
976
seckey = arg;
977
break;
978
case 'p': /* --pubkey */
979
pubkey = arg;
980
break;
981
case 129: /* --dh-bits */
982
errno = 0;
983
tmpmax = strtoimax(arg, &tmp, 10);
984
if(errno != 0 or tmp == arg or *tmp != '\0'
985
or tmpmax != (typeof(mc.dh_bits))tmpmax){
986
fprintf(stderr, "Bad number of DH bits\n");
987
exit(EXIT_FAILURE);
988
}
989
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
990
break;
991
case 130: /* --priority */
992
mc.priority = arg;
993
break;
994
case 131: /* --delay */
995
errno = 0;
996
delay = strtof(arg, &tmp);
997
if(errno != 0 or tmp == arg or *tmp != '\0'){
998
fprintf(stderr, "Bad delay\n");
999
exit(EXIT_FAILURE);
1000
}
1001
break;
1002
case ARGP_KEY_ARG:
1003
argp_usage(state);
1004
case ARGP_KEY_END:
1005
break;
1006
default:
1007
return ARGP_ERR_UNKNOWN;
1008
}
1009
return 0;
1010
}
1011
1012
struct argp argp = { .options = options, .parser = parse_opt,
1013
.args_doc = "",
1014
.doc = "Mandos client -- Get and decrypt"
1015
" passwords from a Mandos server" };
1016
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1017
if(ret == ARGP_ERR_UNKNOWN){
1018
fprintf(stderr, "Unknown error while parsing arguments\n");
1019
exitcode = EXIT_FAILURE;
1020
goto end;
1021
}
1022
}
1023
1024
if(not debug){
1025
avahi_set_log_function(empty_log);
1026
}
1027
1028
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1029
from the signal handler */
1030
/* Initialize the pseudo-RNG for Avahi */
1031
srand((unsigned int) time(NULL));
1032
mc.simple_poll = avahi_simple_poll_new();
1033
if(mc.simple_poll == NULL){
1034
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1035
exitcode = EXIT_FAILURE;
1036
goto end;
1037
}
1038
1039
sigemptyset(&sigterm_action.sa_mask);
1040
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1041
if(ret == -1){
1042
perror("sigaddset");
1043
exitcode = EXIT_FAILURE;
1044
goto end;
1045
}
1046
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1047
if(ret == -1){
1048
perror("sigaddset");
1049
exitcode = EXIT_FAILURE;
1050
goto end;
1051
}
1052
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1053
if(ret == -1){
1054
perror("sigaddset");
1055
exitcode = EXIT_FAILURE;
1056
goto end;
1057
}
1058
ret = sigaction(SIGINT, &sigterm_action, &old_sigterm_action);
1059
if(ret == -1){
1060
perror("sigaction");
1061
exitcode = EXIT_FAILURE;
1062
goto end;
1063
}
1064
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1065
if(ret == -1){
1066
perror("sigaction");
1067
exitcode = EXIT_FAILURE;
1068
goto end;
1069
}
1070
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1071
if(ret == -1){
1072
perror("sigaction");
1073
exitcode = EXIT_FAILURE;
1074
goto end;
1075
}
1076
1077
/* If the interface is down, bring it up */
1078
if(interface[0] != '\0'){
1079
if_index = (AvahiIfIndex) if_nametoindex(interface);
1080
if(if_index == 0){
1081
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1082
exitcode = EXIT_FAILURE;
1083
goto end;
1084
}
1085
1086
if(quit_now){
1087
goto end;
1088
}
1089
1090
#ifdef __linux__
1091
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1092
messages to mess up the prompt */
1093
ret = klogctl(8, NULL, 5);
1094
bool restore_loglevel = true;
1095
if(ret == -1){
1096
restore_loglevel = false;
1097
perror("klogctl");
1098
}
1099
#endif /* __linux__ */
1100
1101
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1102
if(sd < 0){
1103
perror("socket");
1104
exitcode = EXIT_FAILURE;
1105
#ifdef __linux__
1106
if(restore_loglevel){
1107
ret = klogctl(7, NULL, 0);
1108
if(ret == -1){
1109
perror("klogctl");
1110
}
1111
}
1112
#endif /* __linux__ */
1113
goto end;
1114
}
1115
strcpy(network.ifr_name, interface);
1116
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1117
if(ret == -1){
1118
perror("ioctl SIOCGIFFLAGS");
1119
#ifdef __linux__
1120
if(restore_loglevel){
1121
ret = klogctl(7, NULL, 0);
1122
if(ret == -1){
1123
perror("klogctl");
1124
}
1125
}
1126
#endif /* __linux__ */
1127
exitcode = EXIT_FAILURE;
1128
goto end;
1129
}
1130
if((network.ifr_flags & IFF_UP) == 0){
1131
network.ifr_flags |= IFF_UP;
1132
take_down_interface = true;
1133
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1134
if(ret == -1){
1135
take_down_interface = false;
1136
perror("ioctl SIOCSIFFLAGS");
1137
exitcode = EXIT_FAILURE;
1138
#ifdef __linux__
1139
if(restore_loglevel){
1140
ret = klogctl(7, NULL, 0);
1141
if(ret == -1){
1142
perror("klogctl");
891
1143
}
892
break;
893
case 130: /* --priority */
894
mc.priority = arg;
895
break;
896
case ARGP_KEY_ARG:
897
argp_usage (state);
898
case ARGP_KEY_END:
899
break;
900
default:
901
return ARGP_ERR_UNKNOWN;
902
1144
}
903
return 0;
904
}
905
906
struct argp argp = { .options = options, .parser = parse_opt,
907
.args_doc = "",
908
.doc = "Mandos client -- Get and decrypt"
909
" passwords from a Mandos server" };
910
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
911
if (ret == ARGP_ERR_UNKNOWN){
912
fprintf(stderr, "Unknown error while parsing arguments\n");
913
exitcode = EXIT_FAILURE;
1145
#endif /* __linux__ */
914
1146
goto end;
915
1147
}
916
1148
}
917
918
/* If the interface is down, bring it up */
919
{
920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
921
if(sd < 0) {
922
perror("socket");
923
exitcode = EXIT_FAILURE;
924
goto end;
925
}
926
strcpy(network.ifr_name, interface);
1149
/* sleep checking until interface is running */
1150
for(int i=0; i < delay * 4; i++){
927
1151
ret = ioctl(sd, SIOCGIFFLAGS, &network);
928
1152
if(ret == -1){
929
1153
perror("ioctl SIOCGIFFLAGS");
930
exitcode = EXIT_FAILURE;
931
goto end;
932
}
933
if((network.ifr_flags & IFF_UP) == 0){
934
network.ifr_flags |= IFF_UP;
935
ret = ioctl(sd, SIOCSIFFLAGS, &network);
936
if(ret == -1){
937
perror("ioctl SIOCSIFFLAGS");
938
exitcode = EXIT_FAILURE;
939
goto end;
940
}
941
}
942
ret = TEMP_FAILURE_RETRY(close(sd));
1154
} else if(network.ifr_flags & IFF_RUNNING){
1155
break;
1156
}
1157
struct timespec sleeptime = { .tv_nsec = 250000000 };
1158
ret = nanosleep(&sleeptime, NULL);
1159
if(ret == -1 and errno != EINTR){
1160
perror("nanosleep");
1161
}
1162
}
1163
if(not take_down_interface){
1164
/* We won't need the socket anymore */
1165
ret = (int)TEMP_FAILURE_RETRY(close(sd));
943
1166
if(ret == -1){
944
1167
perror("close");
945
1168
}
946
1169
}
947
948
uid = getuid();
949
gid = getgid();
950
951
ret = setuid(uid);
952
if (ret == -1){
953
perror("setuid");
954
}
955
956
setgid(gid);
957
if (ret == -1){
958
perror("setgid");
959
}
960
961
ret = init_gnutls_global(&mc, pubkey, seckey);
962
if (ret == -1){
963
fprintf(stderr, "init_gnutls_global failed\n");
964
exitcode = EXIT_FAILURE;
965
goto end;
966
} else {
967
gnutls_initalized = true;
968
}
969
970
if(mkdtemp(tempdir) == NULL){
971
perror("mkdtemp");
972
tempdir[0] = '\0';
973
goto end;
974
}
975
976
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
977
fprintf(stderr, "gpgme_initalized failed\n");
978
exitcode = EXIT_FAILURE;
979
goto end;
980
} else {
981
gpgme_initalized = true;
982
}
983
984
if_index = (AvahiIfIndex) if_nametoindex(interface);
985
if(if_index == 0){
986
fprintf(stderr, "No such interface: \"%s\"\n", interface);
987
exit(EXIT_FAILURE);
988
}
989
990
if(connect_to != NULL){
991
/* Connect directly, do not use Zeroconf */
992
/* (Mainly meant for debugging) */
993
char *address = strrchr(connect_to, ':');
994
if(address == NULL){
995
fprintf(stderr, "No colon in address\n");
996
exitcode = EXIT_FAILURE;
997
goto end;
998
}
999
errno = 0;
1000
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1001
if(errno){
1002
perror("Bad port number");
1003
exitcode = EXIT_FAILURE;
1004
goto end;
1005
}
1006
*address = '\0';
1007
address = connect_to;
1008
ret = start_mandos_communication(address, port, if_index, &mc);
1009
if(ret < 0){
1010
exitcode = EXIT_FAILURE;
1011
} else {
1012
exitcode = EXIT_SUCCESS;
1013
}
1014
goto end;
1015
}
1016
1017
if (not debug){
1018
avahi_set_log_function(empty_log);
1019
}
1020
1021
/* Initialize the pseudo-RNG for Avahi */
1022
srand((unsigned int) time(NULL));
1023
1024
/* Allocate main Avahi loop object */
1025
mc.simple_poll = avahi_simple_poll_new();
1026
if (mc.simple_poll == NULL) {
1027
fprintf(stderr, "Avahi: Failed to create simple poll"
1028
" object.\n");
1029
exitcode = EXIT_FAILURE;
1030
goto end;
1031
}
1032
1033
{
1034
AvahiServerConfig config;
1035
/* Do not publish any local Zeroconf records */
1036
avahi_server_config_init(&config);
1037
config.publish_hinfo = 0;
1038
config.publish_addresses = 0;
1039
config.publish_workstation = 0;
1040
config.publish_domain = 0;
1041
1042
/* Allocate a new server */
1043
mc.server = avahi_server_new(avahi_simple_poll_get
1044
(mc.simple_poll), &config, NULL,
1045
NULL, &error);
1046
1047
/* Free the Avahi configuration data */
1048
avahi_server_config_free(&config);
1049
}
1050
1051
/* Check if creating the Avahi server object succeeded */
1052
if (mc.server == NULL) {
1053
fprintf(stderr, "Failed to create Avahi server: %s\n",
1054
avahi_strerror(error));
1055
exitcode = EXIT_FAILURE;
1056
goto end;
1057
}
1058
1059
/* Create the Avahi service browser */
1060
sb = avahi_s_service_browser_new(mc.server, if_index,
1061
AVAHI_PROTO_INET6,
1062
"_mandos._tcp", NULL, 0,
1063
browse_callback, &mc);
1064
if (sb == NULL) {
1065
fprintf(stderr, "Failed to create service browser: %s\n",
1066
avahi_strerror(avahi_server_errno(mc.server)));
1067
exitcode = EXIT_FAILURE;
1068
goto end;
1069
}
1070
1071
/* Run the main loop */
1072
1073
if (debug){
1074
fprintf(stderr, "Starting Avahi loop search\n");
1075
}
1076
1077
avahi_simple_poll_loop(mc.simple_poll);
1078
1170
#ifdef __linux__
1171
if(restore_loglevel){
1172
/* Restores kernel loglevel to default */
1173
ret = klogctl(7, NULL, 0);
1174
if(ret == -1){
1175
perror("klogctl");
1176
}
1177
}
1178
#endif /* __linux__ */
1179
}
1180
1181
if(quit_now){
1182
goto end;
1183
}
1184
1185
uid = getuid();
1186
gid = getgid();
1187
1188
errno = 0;
1189
setgid(gid);
1190
if(ret == -1){
1191
perror("setgid");
1192
}
1193
1194
ret = setuid(uid);
1195
if(ret == -1){
1196
perror("setuid");
1197
}
1198
1199
if(quit_now){
1200
goto end;
1201
}
1202
1203
ret = init_gnutls_global(pubkey, seckey);
1204
if(ret == -1){
1205
fprintf(stderr, "init_gnutls_global failed\n");
1206
exitcode = EXIT_FAILURE;
1207
goto end;
1208
} else {
1209
gnutls_initialized = true;
1210
}
1211
1212
if(quit_now){
1213
goto end;
1214
}
1215
1216
tempdir_created = true;
1217
if(mkdtemp(tempdir) == NULL){
1218
tempdir_created = false;
1219
perror("mkdtemp");
1220
goto end;
1221
}
1222
1223
if(quit_now){
1224
goto end;
1225
}
1226
1227
if(not init_gpgme(pubkey, seckey, tempdir)){
1228
fprintf(stderr, "init_gpgme failed\n");
1229
exitcode = EXIT_FAILURE;
1230
goto end;
1231
} else {
1232
gpgme_initialized = true;
1233
}
1234
1235
if(quit_now){
1236
goto end;
1237
}
1238
1239
if(connect_to != NULL){
1240
/* Connect directly, do not use Zeroconf */
1241
/* (Mainly meant for debugging) */
1242
char *address = strrchr(connect_to, ':');
1243
if(address == NULL){
1244
fprintf(stderr, "No colon in address\n");
1245
exitcode = EXIT_FAILURE;
1246
goto end;
1247
}
1248
1249
if(quit_now){
1250
goto end;
1251
}
1252
1253
uint16_t port;
1254
errno = 0;
1255
tmpmax = strtoimax(address+1, &tmp, 10);
1256
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1257
or tmpmax != (uint16_t)tmpmax){
1258
fprintf(stderr, "Bad port number\n");
1259
exitcode = EXIT_FAILURE;
1260
goto end;
1261
}
1262
1263
if(quit_now){
1264
goto end;
1265
}
1266
1267
port = (uint16_t)tmpmax;
1268
*address = '\0';
1269
address = connect_to;
1270
/* Colon in address indicates IPv6 */
1271
int af;
1272
if(strchr(address, ':') != NULL){
1273
af = AF_INET6;
1274
} else {
1275
af = AF_INET;
1276
}
1277
1278
if(quit_now){
1279
goto end;
1280
}
1281
1282
ret = start_mandos_communication(address, port, if_index, af);
1283
if(ret < 0){
1284
exitcode = EXIT_FAILURE;
1285
} else {
1286
exitcode = EXIT_SUCCESS;
1287
}
1288
goto end;
1289
}
1290
1291
if(quit_now){
1292
goto end;
1293
}
1294
1295
{
1296
AvahiServerConfig config;
1297
/* Do not publish any local Zeroconf records */
1298
avahi_server_config_init(&config);
1299
config.publish_hinfo = 0;
1300
config.publish_addresses = 0;
1301
config.publish_workstation = 0;
1302
config.publish_domain = 0;
1303
1304
/* Allocate a new server */
1305
mc.server = avahi_server_new(avahi_simple_poll_get
1306
(mc.simple_poll), &config, NULL,
1307
NULL, &error);
1308
1309
/* Free the Avahi configuration data */
1310
avahi_server_config_free(&config);
1311
}
1312
1313
/* Check if creating the Avahi server object succeeded */
1314
if(mc.server == NULL){
1315
fprintf(stderr, "Failed to create Avahi server: %s\n",
1316
avahi_strerror(error));
1317
exitcode = EXIT_FAILURE;
1318
goto end;
1319
}
1320
1321
if(quit_now){
1322
goto end;
1323
}
1324
1325
/* Create the Avahi service browser */
1326
sb = avahi_s_service_browser_new(mc.server, if_index,
1327
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1328
NULL, 0, browse_callback, NULL);
1329
if(sb == NULL){
1330
fprintf(stderr, "Failed to create service browser: %s\n",
1331
avahi_strerror(avahi_server_errno(mc.server)));
1332
exitcode = EXIT_FAILURE;
1333
goto end;
1334
}
1335
1336
if(quit_now){
1337
goto end;
1338
}
1339
1340
/* Run the main loop */
1341
1342
if(debug){
1343
fprintf(stderr, "Starting Avahi loop search\n");
1344
}
1345
1346
avahi_simple_poll_loop(mc.simple_poll);
1347
1079
1348
end:
1080
1081
if (debug){
1082
fprintf(stderr, "%s exiting\n", argv[0]);
1083
}
1084
1085
/* Cleanup things */
1086
if (sb != NULL)
1087
avahi_s_service_browser_free(sb);
1088
1089
if (mc.server != NULL)
1090
avahi_server_free(mc.server);
1091
1092
if (mc.simple_poll != NULL)
1093
avahi_simple_poll_free(mc.simple_poll);
1094
1095
if (gnutls_initalized){
1096
gnutls_certificate_free_credentials(mc.cred);
1097
gnutls_global_deinit ();
1098
gnutls_dh_params_deinit(mc.dh_params);
1099
}
1100
1101
if(gpgme_initalized){
1102
gpgme_release(mc.ctx);
1103
}
1104
1105
/* Removes the temp directory used by GPGME */
1106
if(tempdir[0] != '\0'){
1107
DIR *d;
1108
struct dirent *direntry;
1109
d = opendir(tempdir);
1110
if(d == NULL){
1349
1350
if(debug){
1351
fprintf(stderr, "%s exiting\n", argv[0]);
1352
}
1353
1354
/* Cleanup things */
1355
if(sb != NULL)
1356
avahi_s_service_browser_free(sb);
1357
1358
if(mc.server != NULL)
1359
avahi_server_free(mc.server);
1360
1361
if(mc.simple_poll != NULL)
1362
avahi_simple_poll_free(mc.simple_poll);
1363
1364
if(gnutls_initialized){
1365
gnutls_certificate_free_credentials(mc.cred);
1366
gnutls_global_deinit();
1367
gnutls_dh_params_deinit(mc.dh_params);
1368
}
1369
1370
if(gpgme_initialized){
1371
gpgme_release(mc.ctx);
1372
}
1373
1374
/* Take down the network interface */
1375
if(take_down_interface){
1376
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1377
if(ret == -1){
1378
perror("ioctl SIOCGIFFLAGS");
1379
} else if(network.ifr_flags & IFF_UP) {
1380
network.ifr_flags &= ~IFF_UP; /* clear flag */
1381
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1382
if(ret == -1){
1383
perror("ioctl SIOCSIFFLAGS");
1384
}
1385
}
1386
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1387
if(ret == -1){
1388
perror("close");
1389
}
1390
}
1391
1392
/* Removes the temp directory used by GPGME */
1393
if(tempdir_created){
1394
DIR *d;
1395
struct dirent *direntry;
1396
d = opendir(tempdir);
1397
if(d == NULL){
1398
if(errno != ENOENT){
1111
1399
perror("opendir");
1112
} else {
1113
while(true){
1114
direntry = readdir(d);
1115
if(direntry == NULL){
1116
break;
1117
}
1118
if (direntry->d_type == DT_REG){
1119
char *fullname = NULL;
1120
ret = asprintf(&fullname, "%s/%s", tempdir,
1121
direntry->d_name);
1122
if(ret < 0){
1123
perror("asprintf");
1124
continue;
1125
}
1126
ret = unlink(fullname);
1127
if(ret == -1){
1128
fprintf(stderr, "unlink(\"%s\"): %s",
1129
fullname, strerror(errno));
1130
}
1131
free(fullname);
1132
}
1133
}
1134
closedir(d);
1135
}
1136
ret = rmdir(tempdir);
1137
if(ret == -1){
1138
perror("rmdir");
1139
}
1140
}
1141
1142
return exitcode;
1400
}
1401
} else {
1402
while(true){
1403
direntry = readdir(d);
1404
if(direntry == NULL){
1405
break;
1406
}
1407
/* Skip "." and ".." */
1408
if(direntry->d_name[0] == '.'
1409
and (direntry->d_name[1] == '\0'
1410
or (direntry->d_name[1] == '.'
1411
and direntry->d_name[2] == '\0'))){
1412
continue;
1413
}
1414
char *fullname = NULL;
1415
ret = asprintf(&fullname, "%s/%s", tempdir,
1416
direntry->d_name);
1417
if(ret < 0){
1418
perror("asprintf");
1419
continue;
1420
}
1421
ret = remove(fullname);
1422
if(ret == -1){
1423
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1424
strerror(errno));
1425
}
1426
free(fullname);
1427
}
1428
closedir(d);
1429
}
1430
ret = rmdir(tempdir);
1431
if(ret == -1 and errno != ENOENT){
1432
perror("rmdir");
1433
}
1434
}
1435
1436
if(quit_now){
1437
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1438
if(ret == -1){
1439
perror("sigaction");
1440
}
1441
raise(signal_received);
1442
}
1443
1444
return exitcode;
1143
1445
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0