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- Committer: Teddy Hogeborn
- Date: 2008-10-05 17:38:31 UTC
- Revision ID: teddy@fukt.bsnet.se-20081005173831-fysrfayl4yvhlo6x
* INSTALL: Add instructions on how to set the correct network
interface on the cient, and also how to test the server and
verify the password.
* TODO: Clean up old stuff.
* debian/mandos-client.README.Debian: Separate into sections with
headlines. Add instructions on
how to test the server and
verify the password.
* plugin-runner.conf: Add reminder to update initrd image.
interface on the cient, and also how to test the server and
verify the password.
* TODO: Clean up old stuff.
* debian/mandos-client.README.Debian: Separate into sections with
headlines. Add instructions on
how to test the server and
verify the password.
* plugin-runner.conf: Add reminder to update initrd image.
- files added:
- debian/mandos-client.config
- files removed:
- NEWS
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif
39
34
40
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
36
42
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
38
stdout, ferror() */
44
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#include <stddef.h> /* NULL, size_t, ssize_t */
46
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
#include <stdbool.h> /* bool, false, true */
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
45
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
46
#include <sys/ioctl.h> /* ioctl */
52
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
48
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
56
51
#include <sys/stat.h> /* open() */
57
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
53
struct in6_addr, inet_pton(),
54
connect() */
59
55
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
64
58
#include <assert.h> /* assert() */
65
59
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
60
#include <time.h> /* time() */
67
61
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
62
SIOCSIFFLAGS, if_indextoname(),
69
63
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
64
#include <netinet/in.h>
73
65
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
66
getuid(), getgid(), setuid(),
75
67
setgid() */
76
68
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
69
#include <iso646.h> /* not, and */
78
70
#include <argp.h> /* struct argp_option, error_t, struct
79
71
argp_state, struct argp,
80
72
argp_parse(), ARGP_KEY_ARG,
81
73
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
89
74
90
75
/* Avahi */
91
76
/* All Avahi types, constants and functions
104
89
gnutls_*
105
90
init_gnutls_session(),
106
91
GNUTLS_* */
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
109
93
GNUTLS_OPENPGP_FMT_BASE64 */
110
94
111
95
/* GPGME */
137
121
gpgme_ctx_t ctx;
138
122
} mandos_context;
139
123
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
145
124
/*
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
125
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
126
* "buffer_capacity" is how much is currently allocated,
148
127
* "buffer_length" is how much is already used.
149
128
*/
150
size_t incbuffer(char **buffer, size_t buffer_length,
129
size_t adjustbuffer(char **buffer, size_t buffer_length,
151
130
size_t buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
131
if (buffer_length + BUFFER_SIZE > buffer_capacity){
153
132
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
133
if (buffer == NULL){
155
134
return 0;
156
135
}
157
136
buffer_capacity += BUFFER_SIZE;
162
141
/*
163
142
* Initialize GPGME.
164
143
*/
165
static bool init_gpgme(const char *seckey,
144
static bool init_gpgme(mandos_context *mc, const char *seckey,
166
145
const char *pubkey, const char *tempdir){
167
146
int ret;
168
147
gpgme_error_t rc;
170
149
171
150
172
151
/*
173
* Helper function to insert pub and seckey to the engine keyring.
152
* Helper function to insert pub and seckey to the enigne keyring.
174
153
*/
175
154
bool import_key(const char *filename){
176
155
int fd;
177
156
gpgme_data_t pgp_data;
178
157
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
158
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
159
if(fd == -1){
181
160
perror("open");
182
161
return false;
183
162
}
184
163
185
164
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
if(rc != GPG_ERR_NO_ERROR){
165
if (rc != GPG_ERR_NO_ERROR){
187
166
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
167
gpgme_strsource(rc), gpgme_strerror(rc));
189
168
return false;
190
169
}
191
170
192
rc = gpgme_op_import(mc.ctx, pgp_data);
193
if(rc != GPG_ERR_NO_ERROR){
171
rc = gpgme_op_import(mc->ctx, pgp_data);
172
if (rc != GPG_ERR_NO_ERROR){
194
173
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
174
gpgme_strsource(rc), gpgme_strerror(rc));
196
175
return false;
197
176
}
198
177
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
178
ret = TEMP_FAILURE_RETRY(close(fd));
200
179
if(ret == -1){
201
180
perror("close");
202
181
}
204
183
return true;
205
184
}
206
185
207
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
186
if (debug){
187
fprintf(stderr, "Initialize gpgme\n");
209
188
}
210
189
211
190
/* Init GPGME */
212
191
gpgme_check_version(NULL);
213
192
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
if(rc != GPG_ERR_NO_ERROR){
193
if (rc != GPG_ERR_NO_ERROR){
215
194
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
195
gpgme_strsource(rc), gpgme_strerror(rc));
217
196
return false;
218
197
}
219
198
220
199
/* Set GPGME home directory for the OpenPGP engine only */
221
rc = gpgme_get_engine_info(&engine_info);
222
if(rc != GPG_ERR_NO_ERROR){
200
rc = gpgme_get_engine_info (&engine_info);
201
if (rc != GPG_ERR_NO_ERROR){
223
202
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
203
gpgme_strsource(rc), gpgme_strerror(rc));
225
204
return false;
238
217
}
239
218
240
219
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
242
if(rc != GPG_ERR_NO_ERROR){
220
rc = gpgme_new(&(mc->ctx));
221
if (rc != GPG_ERR_NO_ERROR){
243
222
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
223
gpgme_strsource(rc), gpgme_strerror(rc));
245
224
return false;
246
225
}
247
226
248
if(not import_key(pubkey) or not import_key(seckey)){
227
if (not import_key(pubkey) or not import_key(seckey)){
249
228
return false;
250
229
}
251
230
252
return true;
231
return true;
253
232
}
254
233
255
234
/*
256
235
* Decrypt OpenPGP data.
257
236
* Returns -1 on error
258
237
*/
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
size_t crypto_size,
261
char **plaintext){
238
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
239
const char *cryptotext,
240
size_t crypto_size,
241
char **plaintext){
262
242
gpgme_data_t dh_crypto, dh_plain;
263
243
gpgme_error_t rc;
264
244
ssize_t ret;
265
245
size_t plaintext_capacity = 0;
266
246
ssize_t plaintext_length = 0;
267
247
268
if(debug){
248
if (debug){
269
249
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
270
250
}
271
251
272
252
/* Create new GPGME data buffer from memory cryptotext */
273
253
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
254
0);
275
if(rc != GPG_ERR_NO_ERROR){
255
if (rc != GPG_ERR_NO_ERROR){
276
256
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
257
gpgme_strsource(rc), gpgme_strerror(rc));
278
258
return -1;
280
260
281
261
/* Create new empty GPGME data buffer for the plaintext */
282
262
rc = gpgme_data_new(&dh_plain);
283
if(rc != GPG_ERR_NO_ERROR){
263
if (rc != GPG_ERR_NO_ERROR){
284
264
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
265
gpgme_strsource(rc), gpgme_strerror(rc));
286
266
gpgme_data_release(dh_crypto);
289
269
290
270
/* Decrypt data from the cryptotext data buffer to the plaintext
291
271
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
272
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
273
if (rc != GPG_ERR_NO_ERROR){
294
274
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
275
gpgme_strsource(rc), gpgme_strerror(rc));
296
276
plaintext_length = -1;
297
if(debug){
277
if (debug){
298
278
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
300
if(result == NULL){
279
result = gpgme_op_decrypt_result(mc->ctx);
280
if (result == NULL){
301
281
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
302
282
} else {
303
283
fprintf(stderr, "Unsupported algorithm: %s\n",
309
289
}
310
290
gpgme_recipient_t recipient;
311
291
recipient = result->recipients;
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;
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
}
320
302
}
321
303
}
322
304
}
328
310
}
329
311
330
312
/* Seek back to the beginning of the GPGME plaintext data buffer */
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
313
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
332
314
perror("gpgme_data_seek");
333
315
plaintext_length = -1;
334
316
goto decrypt_end;
336
318
337
319
*plaintext = NULL;
338
320
while(true){
339
plaintext_capacity = incbuffer(plaintext,
321
plaintext_capacity = adjustbuffer(plaintext,
340
322
(size_t)plaintext_length,
341
323
plaintext_capacity);
342
if(plaintext_capacity == 0){
343
perror("incbuffer");
324
if (plaintext_capacity == 0){
325
perror("adjustbuffer");
344
326
plaintext_length = -1;
345
327
goto decrypt_end;
346
328
}
348
330
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
349
331
BUFFER_SIZE);
350
332
/* Print the data, if any */
351
if(ret == 0){
333
if (ret == 0){
352
334
/* EOF */
353
335
break;
354
336
}
378
360
return plaintext_length;
379
361
}
380
362
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)
363
static const char * safer_gnutls_strerror (int value) {
364
const char *ret = gnutls_strerror (value); /* Spurious warning */
365
if (ret == NULL)
385
366
ret = "(unknown)";
386
367
return ret;
387
368
}
392
373
fprintf(stderr, "GnuTLS: %s", string);
393
374
}
394
375
395
static int init_gnutls_global(const char *pubkeyfilename,
376
static int init_gnutls_global(mandos_context *mc,
377
const char *pubkeyfilename,
396
378
const char *seckeyfilename){
397
379
int ret;
398
380
401
383
}
402
384
403
385
ret = gnutls_global_init();
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
386
if (ret != GNUTLS_E_SUCCESS) {
387
fprintf (stderr, "GnuTLS global_init: %s\n",
388
safer_gnutls_strerror(ret));
407
389
return -1;
408
390
}
409
391
410
if(debug){
392
if (debug){
411
393
/* "Use a log level over 10 to enable all debugging options."
412
394
* - GnuTLS manual
413
395
*/
416
398
}
417
399
418
400
/* OpenPGP credentials */
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();
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 ();
427
407
return -1;
428
408
}
429
409
434
414
}
435
415
436
416
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
417
(mc->cred, pubkeyfilename, seckeyfilename,
438
418
GNUTLS_OPENPGP_FMT_BASE64);
439
if(ret != GNUTLS_E_SUCCESS){
419
if (ret != GNUTLS_E_SUCCESS) {
440
420
fprintf(stderr,
441
421
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
422
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
446
426
}
447
427
448
428
/* GnuTLS server initialization */
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));
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));
453
433
goto globalfail;
454
434
}
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));
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));
459
439
goto globalfail;
460
440
}
461
441
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
442
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
463
443
464
444
return 0;
465
445
466
446
globalfail:
467
447
468
gnutls_certificate_free_credentials(mc.cred);
448
gnutls_certificate_free_credentials(mc->cred);
469
449
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
450
gnutls_dh_params_deinit(mc->dh_params);
471
451
return -1;
472
452
}
473
453
474
static int init_gnutls_session(gnutls_session_t *session){
454
static int init_gnutls_session(mandos_context *mc,
455
gnutls_session_t *session){
475
456
int ret;
476
457
/* GnuTLS session creation */
477
458
ret = gnutls_init(session, GNUTLS_SERVER);
478
if(ret != GNUTLS_E_SUCCESS){
459
if (ret != GNUTLS_E_SUCCESS){
479
460
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
461
safer_gnutls_strerror(ret));
481
462
}
482
463
483
464
{
484
465
const char *err;
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
486
if(ret != GNUTLS_E_SUCCESS){
466
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
467
if (ret != GNUTLS_E_SUCCESS) {
487
468
fprintf(stderr, "Syntax error at: %s\n", err);
488
469
fprintf(stderr, "GnuTLS error: %s\n",
489
470
safer_gnutls_strerror(ret));
490
gnutls_deinit(*session);
471
gnutls_deinit (*session);
491
472
return -1;
492
473
}
493
474
}
494
475
495
476
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
497
if(ret != GNUTLS_E_SUCCESS){
477
mc->cred);
478
if (ret != GNUTLS_E_SUCCESS) {
498
479
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
480
safer_gnutls_strerror(ret));
500
gnutls_deinit(*session);
481
gnutls_deinit (*session);
501
482
return -1;
502
483
}
503
484
504
485
/* ignore client certificate if any. */
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
486
gnutls_certificate_server_set_request (*session,
487
GNUTLS_CERT_IGNORE);
507
488
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
489
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
509
490
510
491
return 0;
511
492
}
514
495
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
515
496
__attribute__((unused)) const char *txt){}
516
497
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
520
498
/* Called when a Mandos server is found */
521
499
static int start_mandos_communication(const char *ip, uint16_t port,
522
500
AvahiIfIndex if_index,
523
int af){
524
int ret, tcp_sd = -1;
525
ssize_t sret;
526
union {
527
struct sockaddr_in in;
528
struct sockaddr_in6 in6;
529
} to;
501
mandos_context *mc){
502
int ret, tcp_sd;
503
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
530
504
char *buffer = NULL;
531
505
char *decrypted_buffer;
532
506
size_t buffer_length = 0;
534
508
ssize_t decrypted_buffer_size;
535
509
size_t written;
536
510
int retval = 0;
511
char interface[IF_NAMESIZE];
537
512
gnutls_session_t session;
538
int pf; /* Protocol family */
539
540
if(quit_now){
541
return -1;
542
}
543
544
switch(af){
545
case AF_INET6:
546
pf = PF_INET6;
547
break;
548
case AF_INET:
549
pf = PF_INET;
550
break;
551
default:
552
fprintf(stderr, "Bad address family: %d\n", af);
553
return -1;
554
}
555
556
ret = init_gnutls_session(&session);
557
if(ret != 0){
513
514
ret = init_gnutls_session (mc, &session);
515
if (ret != 0){
558
516
return -1;
559
517
}
560
518
561
519
if(debug){
562
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
520
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
563
521
"\n", ip, port);
564
522
}
565
523
566
tcp_sd = socket(pf, SOCK_STREAM, 0);
567
if(tcp_sd < 0){
524
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
525
if(tcp_sd < 0) {
568
526
perror("socket");
569
retval = -1;
570
goto mandos_end;
527
return -1;
571
528
}
572
529
573
if(quit_now){
574
goto mandos_end;
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);
575
536
}
576
537
577
538
memset(&to, 0, sizeof(to));
578
if(af == AF_INET6){
579
to.in6.sin6_family = (sa_family_t)af;
580
ret = inet_pton(af, ip, &to.in6.sin6_addr);
581
} else { /* IPv4 */
582
to.in.sin_family = (sa_family_t)af;
583
ret = inet_pton(af, ip, &to.in.sin_addr);
584
}
585
if(ret < 0 ){
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 ){
586
544
perror("inet_pton");
587
retval = -1;
588
goto mandos_end;
545
return -1;
589
546
}
590
547
if(ret == 0){
591
548
fprintf(stderr, "Bad address: %s\n", ip);
592
retval = -1;
593
goto mandos_end;
594
}
595
if(af == AF_INET6){
596
to.in6.sin6_port = htons(port); /* Spurious warnings from
597
-Wconversion and
598
-Wunreachable-code */
599
600
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
601
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
602
-Wunreachable-code*/
603
if(if_index == AVAHI_IF_UNSPEC){
604
fprintf(stderr, "An IPv6 link-local address is incomplete"
605
" without a network interface\n");
606
retval = -1;
607
goto mandos_end;
608
}
609
/* Set the network interface number as scope */
610
to.in6.sin6_scope_id = (uint32_t)if_index;
611
}
612
} else {
613
to.in.sin_port = htons(port); /* Spurious warnings from
614
-Wconversion and
615
-Wunreachable-code */
616
}
549
return -1;
550
}
551
to.in6.sin6_port = htons(port); /* Spurious warning */
617
552
618
if(quit_now){
619
goto mandos_end;
620
}
553
to.in6.sin6_scope_id = (uint32_t)if_index;
621
554
622
555
if(debug){
623
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
624
char interface[IF_NAMESIZE];
625
if(if_indextoname((unsigned int)if_index, interface) == NULL){
626
perror("if_indextoname");
627
} else {
628
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
629
ip, interface, port);
630
}
631
} else {
632
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
633
port);
634
}
635
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
636
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
637
const char *pcret;
638
if(af == AF_INET6){
639
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
640
sizeof(addrstr));
641
} else {
642
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
643
sizeof(addrstr));
644
}
645
if(pcret == NULL){
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){
646
561
perror("inet_ntop");
647
562
} else {
648
563
if(strcmp(addrstr, ip) != 0){
651
566
}
652
567
}
653
568
654
if(quit_now){
655
goto mandos_end;
656
}
657
658
if(af == AF_INET6){
659
ret = connect(tcp_sd, &to.in6, sizeof(to));
660
} else {
661
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
662
}
663
if(ret < 0){
569
ret = connect(tcp_sd, &to.in, sizeof(to));
570
if (ret < 0){
664
571
perror("connect");
665
retval = -1;
666
goto mandos_end;
667
}
668
669
if(quit_now){
670
goto mandos_end;
572
return -1;
671
573
}
672
574
673
575
const char *out = mandos_protocol_version;
674
576
written = 0;
675
while(true){
577
while (true){
676
578
size_t out_size = strlen(out);
677
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
579
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
678
580
out_size - written));
679
if(ret == -1){
581
if (ret == -1){
680
582
perror("write");
681
583
retval = -1;
682
584
goto mandos_end;
685
587
if(written < out_size){
686
588
continue;
687
589
} else {
688
if(out == mandos_protocol_version){
590
if (out == mandos_protocol_version){
689
591
written = 0;
690
592
out = "\r\n";
691
593
} else {
692
594
break;
693
595
}
694
596
}
695
696
if(quit_now){
697
goto mandos_end;
698
}
699
597
}
700
598
701
599
if(debug){
702
600
fprintf(stderr, "Establishing TLS session with %s\n", ip);
703
601
}
704
602
705
if(quit_now){
706
goto mandos_end;
707
}
708
709
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
710
711
if(quit_now){
712
goto mandos_end;
713
}
603
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
714
604
715
605
do{
716
ret = gnutls_handshake(session);
717
if(quit_now){
718
goto mandos_end;
719
}
606
ret = gnutls_handshake (session);
720
607
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
721
608
722
if(ret != GNUTLS_E_SUCCESS){
609
if (ret != GNUTLS_E_SUCCESS){
723
610
if(debug){
724
611
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
725
gnutls_perror(ret);
612
gnutls_perror (ret);
726
613
}
727
614
retval = -1;
728
615
goto mandos_end;
731
618
/* Read OpenPGP packet that contains the wanted password */
732
619
733
620
if(debug){
734
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
621
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
735
622
ip);
736
623
}
737
624
738
625
while(true){
739
740
if(quit_now){
741
goto mandos_end;
742
}
743
744
buffer_capacity = incbuffer(&buffer, buffer_length,
626
buffer_capacity = adjustbuffer(&buffer, buffer_length,
745
627
buffer_capacity);
746
if(buffer_capacity == 0){
747
perror("incbuffer");
628
if (buffer_capacity == 0){
629
perror("adjustbuffer");
748
630
retval = -1;
749
631
goto mandos_end;
750
632
}
751
633
752
if(quit_now){
753
goto mandos_end;
754
}
755
756
sret = gnutls_record_recv(session, buffer+buffer_length,
757
BUFFER_SIZE);
758
if(sret == 0){
634
ret = gnutls_record_recv(session, buffer+buffer_length,
635
BUFFER_SIZE);
636
if (ret == 0){
759
637
break;
760
638
}
761
if(sret < 0){
762
switch(sret){
639
if (ret < 0){
640
switch(ret){
763
641
case GNUTLS_E_INTERRUPTED:
764
642
case GNUTLS_E_AGAIN:
765
643
break;
766
644
case GNUTLS_E_REHANDSHAKE:
767
645
do{
768
ret = gnutls_handshake(session);
769
770
if(quit_now){
771
goto mandos_end;
772
}
646
ret = gnutls_handshake (session);
773
647
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
774
if(ret < 0){
648
if (ret < 0){
775
649
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
776
gnutls_perror(ret);
650
gnutls_perror (ret);
777
651
retval = -1;
778
652
goto mandos_end;
779
653
}
782
656
fprintf(stderr, "Unknown error while reading data from"
783
657
" encrypted session with Mandos server\n");
784
658
retval = -1;
785
gnutls_bye(session, GNUTLS_SHUT_RDWR);
659
gnutls_bye (session, GNUTLS_SHUT_RDWR);
786
660
goto mandos_end;
787
661
}
788
662
} else {
789
buffer_length += (size_t) sret;
663
buffer_length += (size_t) ret;
790
664
}
791
665
}
792
666
794
668
fprintf(stderr, "Closing TLS session\n");
795
669
}
796
670
797
if(quit_now){
798
goto mandos_end;
799
}
800
801
gnutls_bye(session, GNUTLS_SHUT_RDWR);
802
803
if(quit_now){
804
goto mandos_end;
805
}
806
807
if(buffer_length > 0){
808
decrypted_buffer_size = pgp_packet_decrypt(buffer,
671
gnutls_bye (session, GNUTLS_SHUT_RDWR);
672
673
if (buffer_length > 0){
674
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
809
675
buffer_length,
810
676
&decrypted_buffer);
811
if(decrypted_buffer_size >= 0){
677
if (decrypted_buffer_size >= 0){
812
678
written = 0;
813
679
while(written < (size_t) decrypted_buffer_size){
814
if(quit_now){
815
goto mandos_end;
816
}
817
818
ret = (int)fwrite(decrypted_buffer + written, 1,
819
(size_t)decrypted_buffer_size - written,
820
stdout);
680
ret = (int)fwrite (decrypted_buffer + written, 1,
681
(size_t)decrypted_buffer_size - written,
682
stdout);
821
683
if(ret == 0 and ferror(stdout)){
822
684
if(debug){
823
685
fprintf(stderr, "Error writing encrypted data: %s\n",
840
702
841
703
mandos_end:
842
704
free(buffer);
843
if(tcp_sd >= 0){
844
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
845
}
705
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
846
706
if(ret == -1){
847
707
perror("close");
848
708
}
849
gnutls_deinit(session);
850
if(quit_now){
851
retval = -1;
852
}
709
gnutls_deinit (session);
853
710
return retval;
854
711
}
855
712
856
713
static void resolve_callback(AvahiSServiceResolver *r,
857
714
AvahiIfIndex interface,
858
AvahiProtocol proto,
715
AVAHI_GCC_UNUSED AvahiProtocol protocol,
859
716
AvahiResolverEvent event,
860
717
const char *name,
861
718
const char *type,
866
723
AVAHI_GCC_UNUSED AvahiStringList *txt,
867
724
AVAHI_GCC_UNUSED AvahiLookupResultFlags
868
725
flags,
869
AVAHI_GCC_UNUSED void* userdata){
726
void* userdata) {
727
mandos_context *mc = userdata;
870
728
assert(r);
871
729
872
730
/* Called whenever a service has been resolved successfully or
873
731
timed out */
874
732
875
if(quit_now){
876
return;
877
}
878
879
switch(event){
733
switch (event) {
880
734
default:
881
735
case AVAHI_RESOLVER_FAILURE:
882
736
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
883
737
" of type '%s' in domain '%s': %s\n", name, type, domain,
884
avahi_strerror(avahi_server_errno(mc.server)));
738
avahi_strerror(avahi_server_errno(mc->server)));
885
739
break;
886
740
887
741
case AVAHI_RESOLVER_FOUND:
890
744
avahi_address_snprint(ip, sizeof(ip), address);
891
745
if(debug){
892
746
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
893
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
894
ip, (intmax_t)interface, port);
747
PRIu16 ") on port %d\n", name, host_name, ip,
748
interface, port);
895
749
}
896
int ret = start_mandos_communication(ip, port, interface,
897
avahi_proto_to_af(proto));
898
if(ret == 0){
899
avahi_simple_poll_quit(mc.simple_poll);
750
int ret = start_mandos_communication(ip, port, interface, mc);
751
if (ret == 0){
752
avahi_simple_poll_quit(mc->simple_poll);
900
753
}
901
754
}
902
755
}
903
756
avahi_s_service_resolver_free(r);
904
757
}
905
758
906
static void browse_callback(AvahiSServiceBrowser *b,
907
AvahiIfIndex interface,
908
AvahiProtocol protocol,
909
AvahiBrowserEvent event,
910
const char *name,
911
const char *type,
912
const char *domain,
913
AVAHI_GCC_UNUSED AvahiLookupResultFlags
914
flags,
915
AVAHI_GCC_UNUSED void* userdata){
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;
916
770
assert(b);
917
771
918
772
/* Called whenever a new services becomes available on the LAN or
919
773
is removed from the LAN */
920
774
921
if(quit_now){
922
return;
923
}
924
925
switch(event){
775
switch (event) {
926
776
default:
927
777
case AVAHI_BROWSER_FAILURE:
928
778
929
779
fprintf(stderr, "(Avahi browser) %s\n",
930
avahi_strerror(avahi_server_errno(mc.server)));
931
avahi_simple_poll_quit(mc.simple_poll);
780
avahi_strerror(avahi_server_errno(mc->server)));
781
avahi_simple_poll_quit(mc->simple_poll);
932
782
return;
933
783
934
784
case AVAHI_BROWSER_NEW:
937
787
the callback function is called the Avahi server will free the
938
788
resolver for us. */
939
789
940
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
941
name, type, domain, protocol, 0,
942
resolve_callback, NULL) == NULL)
790
if (!(avahi_s_service_resolver_new(mc->server, interface,
791
protocol, name, type, domain,
792
AVAHI_PROTO_INET6, 0,
793
resolve_callback, mc)))
943
794
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
944
name, avahi_strerror(avahi_server_errno(mc.server)));
795
name, avahi_strerror(avahi_server_errno(mc->server)));
945
796
break;
946
797
947
798
case AVAHI_BROWSER_REMOVE:
956
807
}
957
808
}
958
809
959
/* stop main loop after sigterm has been called */
960
static void handle_sigterm(int sig){
961
if(quit_now){
962
return;
963
}
964
quit_now = 1;
965
signal_received = sig;
966
int old_errno = errno;
967
if(mc.simple_poll != NULL){
968
avahi_simple_poll_quit(mc.simple_poll);
969
}
970
errno = old_errno;
971
}
972
973
810
int main(int argc, char *argv[]){
974
AvahiSServiceBrowser *sb = NULL;
975
int error;
976
int ret;
977
intmax_t tmpmax;
978
char *tmp;
979
int exitcode = EXIT_SUCCESS;
980
const char *interface = "eth0";
981
struct ifreq network;
982
int sd = -1;
983
bool take_down_interface = false;
984
uid_t uid;
985
gid_t gid;
986
char *connect_to = NULL;
987
char tempdir[] = "/tmp/mandosXXXXXX";
988
bool tempdir_created = false;
989
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
990
const char *seckey = PATHDIR "/" SECKEY;
991
const char *pubkey = PATHDIR "/" PUBKEY;
992
993
bool gnutls_initialized = false;
994
bool gpgme_initialized = false;
995
float delay = 2.5f;
996
997
struct sigaction old_sigterm_action;
998
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
999
1000
{
1001
struct argp_option options[] = {
1002
{ .name = "debug", .key = 128,
1003
.doc = "Debug mode", .group = 3 },
1004
{ .name = "connect", .key = 'c',
1005
.arg = "ADDRESS:PORT",
1006
.doc = "Connect directly to a specific Mandos server",
1007
.group = 1 },
1008
{ .name = "interface", .key = 'i',
1009
.arg = "NAME",
1010
.doc = "Network interface that will be used to search for"
1011
" Mandos servers",
1012
.group = 1 },
1013
{ .name = "seckey", .key = 's',
1014
.arg = "FILE",
1015
.doc = "OpenPGP secret key file base name",
1016
.group = 1 },
1017
{ .name = "pubkey", .key = 'p',
1018
.arg = "FILE",
1019
.doc = "OpenPGP public key file base name",
1020
.group = 2 },
1021
{ .name = "dh-bits", .key = 129,
1022
.arg = "BITS",
1023
.doc = "Bit length of the prime number used in the"
1024
" Diffie-Hellman key exchange",
1025
.group = 2 },
1026
{ .name = "priority", .key = 130,
1027
.arg = "STRING",
1028
.doc = "GnuTLS priority string for the TLS handshake",
1029
.group = 1 },
1030
{ .name = "delay", .key = 131,
1031
.arg = "SECONDS",
1032
.doc = "Maximum delay to wait for interface startup",
1033
.group = 2 },
1034
{ .name = NULL }
1035
};
1036
1037
error_t parse_opt(int key, char *arg,
1038
struct argp_state *state){
1039
switch(key){
1040
case 128: /* --debug */
1041
debug = true;
1042
break;
1043
case 'c': /* --connect */
1044
connect_to = arg;
1045
break;
1046
case 'i': /* --interface */
1047
interface = arg;
1048
break;
1049
case 's': /* --seckey */
1050
seckey = arg;
1051
break;
1052
case 'p': /* --pubkey */
1053
pubkey = arg;
1054
break;
1055
case 129: /* --dh-bits */
1056
errno = 0;
1057
tmpmax = strtoimax(arg, &tmp, 10);
1058
if(errno != 0 or tmp == arg or *tmp != '\0'
1059
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1060
fprintf(stderr, "Bad number of DH bits\n");
1061
exit(EXIT_FAILURE);
1062
}
1063
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1064
break;
1065
case 130: /* --priority */
1066
mc.priority = arg;
1067
break;
1068
case 131: /* --delay */
1069
errno = 0;
1070
delay = strtof(arg, &tmp);
1071
if(errno != 0 or tmp == arg or *tmp != '\0'){
1072
fprintf(stderr, "Bad delay\n");
1073
exit(EXIT_FAILURE);
1074
}
1075
break;
1076
case ARGP_KEY_ARG:
1077
argp_usage(state);
1078
case ARGP_KEY_END:
1079
break;
1080
default:
1081
return ARGP_ERR_UNKNOWN;
1082
}
1083
return 0;
1084
}
1085
1086
struct argp argp = { .options = options, .parser = parse_opt,
1087
.args_doc = "",
1088
.doc = "Mandos client -- Get and decrypt"
1089
" passwords from a Mandos server" };
1090
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1091
if(ret == ARGP_ERR_UNKNOWN){
1092
fprintf(stderr, "Unknown error while parsing arguments\n");
1093
exitcode = EXIT_FAILURE;
1094
goto end;
1095
}
1096
}
1097
1098
if(not debug){
1099
avahi_set_log_function(empty_log);
1100
}
1101
1102
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1103
from the signal handler */
1104
/* Initialize the pseudo-RNG for Avahi */
1105
srand((unsigned int) time(NULL));
1106
mc.simple_poll = avahi_simple_poll_new();
1107
if(mc.simple_poll == NULL){
1108
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1109
exitcode = EXIT_FAILURE;
1110
goto end;
1111
}
1112
1113
sigemptyset(&sigterm_action.sa_mask);
1114
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1115
if(ret == -1){
1116
perror("sigaddset");
1117
exitcode = EXIT_FAILURE;
1118
goto end;
1119
}
1120
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1121
if(ret == -1){
1122
perror("sigaddset");
1123
exitcode = EXIT_FAILURE;
1124
goto end;
1125
}
1126
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1127
if(ret == -1){
1128
perror("sigaddset");
1129
exitcode = EXIT_FAILURE;
1130
goto end;
1131
}
1132
/* Need to check if the handler is SIG_IGN before handling:
1133
| [[info:libc:Initial Signal Actions]] |
1134
| [[info:libc:Basic Signal Handling]] |
1135
*/
1136
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1137
if(ret == -1){
1138
perror("sigaction");
1139
return EXIT_FAILURE;
1140
}
1141
if(old_sigterm_action.sa_handler != SIG_IGN){
1142
ret = sigaction(SIGINT, &sigterm_action, NULL);
1143
if(ret == -1){
1144
perror("sigaction");
1145
exitcode = EXIT_FAILURE;
1146
goto end;
1147
}
1148
}
1149
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1150
if(ret == -1){
1151
perror("sigaction");
1152
return EXIT_FAILURE;
1153
}
1154
if(old_sigterm_action.sa_handler != SIG_IGN){
1155
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1156
if(ret == -1){
1157
perror("sigaction");
1158
exitcode = EXIT_FAILURE;
1159
goto end;
1160
}
1161
}
1162
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1163
if(ret == -1){
1164
perror("sigaction");
1165
return EXIT_FAILURE;
1166
}
1167
if(old_sigterm_action.sa_handler != SIG_IGN){
1168
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1169
if(ret == -1){
1170
perror("sigaction");
1171
exitcode = EXIT_FAILURE;
1172
goto end;
1173
}
1174
}
1175
1176
/* If the interface is down, bring it up */
1177
if(interface[0] != '\0'){
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);
891
}
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
}
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;
914
goto end;
915
}
916
}
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);
927
ret = ioctl(sd, SIOCGIFFLAGS, &network);
928
if(ret == -1){
929
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));
943
if(ret == -1){
944
perror("close");
945
}
946
}
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
1178
984
if_index = (AvahiIfIndex) if_nametoindex(interface);
1179
985
if(if_index == 0){
1180
986
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1181
exitcode = EXIT_FAILURE;
1182
goto end;
1183
}
1184
1185
if(quit_now){
1186
goto end;
1187
}
1188
1189
#ifdef __linux__
1190
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1191
messages to mess up the prompt */
1192
ret = klogctl(8, NULL, 5);
1193
bool restore_loglevel = true;
1194
if(ret == -1){
1195
restore_loglevel = false;
1196
perror("klogctl");
1197
}
1198
#endif /* __linux__ */
1199
1200
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1201
if(sd < 0){
1202
perror("socket");
1203
exitcode = EXIT_FAILURE;
1204
#ifdef __linux__
1205
if(restore_loglevel){
1206
ret = klogctl(7, NULL, 0);
1207
if(ret == -1){
1208
perror("klogctl");
1209
}
1210
}
1211
#endif /* __linux__ */
1212
goto end;
1213
}
1214
strcpy(network.ifr_name, interface);
1215
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1216
if(ret == -1){
1217
perror("ioctl SIOCGIFFLAGS");
1218
#ifdef __linux__
1219
if(restore_loglevel){
1220
ret = klogctl(7, NULL, 0);
1221
if(ret == -1){
1222
perror("klogctl");
1223
}
1224
}
1225
#endif /* __linux__ */
1226
exitcode = EXIT_FAILURE;
1227
goto end;
1228
}
1229
if((network.ifr_flags & IFF_UP) == 0){
1230
network.ifr_flags |= IFF_UP;
1231
take_down_interface = true;
1232
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1233
if(ret == -1){
1234
take_down_interface = false;
1235
perror("ioctl SIOCSIFFLAGS");
1236
exitcode = EXIT_FAILURE;
1237
#ifdef __linux__
1238
if(restore_loglevel){
1239
ret = klogctl(7, NULL, 0);
1240
if(ret == -1){
1241
perror("klogctl");
1242
}
1243
}
1244
#endif /* __linux__ */
1245
goto end;
1246
}
1247
}
1248
/* sleep checking until interface is running */
1249
for(int i=0; i < delay * 4; i++){
1250
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1251
if(ret == -1){
1252
perror("ioctl SIOCGIFFLAGS");
1253
} else if(network.ifr_flags & IFF_RUNNING){
1254
break;
1255
}
1256
struct timespec sleeptime = { .tv_nsec = 250000000 };
1257
ret = nanosleep(&sleeptime, NULL);
1258
if(ret == -1 and errno != EINTR){
1259
perror("nanosleep");
1260
}
1261
}
1262
if(not take_down_interface){
1263
/* We won't need the socket anymore */
1264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1265
if(ret == -1){
1266
perror("close");
1267
}
1268
}
1269
#ifdef __linux__
1270
if(restore_loglevel){
1271
/* Restores kernel loglevel to default */
1272
ret = klogctl(7, NULL, 0);
1273
if(ret == -1){
1274
perror("klogctl");
1275
}
1276
}
1277
#endif /* __linux__ */
1278
}
1279
1280
if(quit_now){
1281
goto end;
1282
}
1283
1284
uid = getuid();
1285
gid = getgid();
1286
1287
errno = 0;
1288
setgid(gid);
1289
if(ret == -1){
1290
perror("setgid");
1291
}
1292
1293
ret = setuid(uid);
1294
if(ret == -1){
1295
perror("setuid");
1296
}
1297
1298
if(quit_now){
1299
goto end;
1300
}
1301
1302
ret = init_gnutls_global(pubkey, seckey);
1303
if(ret == -1){
1304
fprintf(stderr, "init_gnutls_global failed\n");
1305
exitcode = EXIT_FAILURE;
1306
goto end;
1307
} else {
1308
gnutls_initialized = true;
1309
}
1310
1311
if(quit_now){
1312
goto end;
1313
}
1314
1315
tempdir_created = true;
1316
if(mkdtemp(tempdir) == NULL){
1317
tempdir_created = false;
1318
perror("mkdtemp");
1319
goto end;
1320
}
1321
1322
if(quit_now){
1323
goto end;
1324
}
1325
1326
if(not init_gpgme(pubkey, seckey, tempdir)){
1327
fprintf(stderr, "init_gpgme failed\n");
1328
exitcode = EXIT_FAILURE;
1329
goto end;
1330
} else {
1331
gpgme_initialized = true;
1332
}
1333
1334
if(quit_now){
1335
goto end;
1336
}
1337
1338
if(connect_to != NULL){
1339
/* Connect directly, do not use Zeroconf */
1340
/* (Mainly meant for debugging) */
1341
char *address = strrchr(connect_to, ':');
1342
if(address == NULL){
1343
fprintf(stderr, "No colon in address\n");
1344
exitcode = EXIT_FAILURE;
1345
goto end;
1346
}
1347
1348
if(quit_now){
1349
goto end;
1350
}
1351
1352
uint16_t port;
1353
errno = 0;
1354
tmpmax = strtoimax(address+1, &tmp, 10);
1355
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1356
or tmpmax != (uint16_t)tmpmax){
1357
fprintf(stderr, "Bad port number\n");
1358
exitcode = EXIT_FAILURE;
1359
goto end;
1360
}
1361
1362
if(quit_now){
1363
goto end;
1364
}
1365
1366
port = (uint16_t)tmpmax;
1367
*address = '\0';
1368
address = connect_to;
1369
/* Colon in address indicates IPv6 */
1370
int af;
1371
if(strchr(address, ':') != NULL){
1372
af = AF_INET6;
1373
} else {
1374
af = AF_INET;
1375
}
1376
1377
if(quit_now){
1378
goto end;
1379
}
1380
1381
ret = start_mandos_communication(address, port, if_index, af);
1382
if(ret < 0){
1383
exitcode = EXIT_FAILURE;
1384
} else {
1385
exitcode = EXIT_SUCCESS;
1386
}
1387
goto end;
1388
}
1389
1390
if(quit_now){
1391
goto end;
1392
}
1393
1394
{
1395
AvahiServerConfig config;
1396
/* Do not publish any local Zeroconf records */
1397
avahi_server_config_init(&config);
1398
config.publish_hinfo = 0;
1399
config.publish_addresses = 0;
1400
config.publish_workstation = 0;
1401
config.publish_domain = 0;
1402
1403
/* Allocate a new server */
1404
mc.server = avahi_server_new(avahi_simple_poll_get
1405
(mc.simple_poll), &config, NULL,
1406
NULL, &error);
1407
1408
/* Free the Avahi configuration data */
1409
avahi_server_config_free(&config);
1410
}
1411
1412
/* Check if creating the Avahi server object succeeded */
1413
if(mc.server == NULL){
1414
fprintf(stderr, "Failed to create Avahi server: %s\n",
1415
avahi_strerror(error));
1416
exitcode = EXIT_FAILURE;
1417
goto end;
1418
}
1419
1420
if(quit_now){
1421
goto end;
1422
}
1423
1424
/* Create the Avahi service browser */
1425
sb = avahi_s_service_browser_new(mc.server, if_index,
1426
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1427
NULL, 0, browse_callback, NULL);
1428
if(sb == NULL){
1429
fprintf(stderr, "Failed to create service browser: %s\n",
1430
avahi_strerror(avahi_server_errno(mc.server)));
1431
exitcode = EXIT_FAILURE;
1432
goto end;
1433
}
1434
1435
if(quit_now){
1436
goto end;
1437
}
1438
1439
/* Run the main loop */
1440
1441
if(debug){
1442
fprintf(stderr, "Starting Avahi loop search\n");
1443
}
1444
1445
avahi_simple_poll_loop(mc.simple_poll);
1446
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
1447
1079
end:
1448
1449
if(debug){
1450
fprintf(stderr, "%s exiting\n", argv[0]);
1451
}
1452
1453
/* Cleanup things */
1454
if(sb != NULL)
1455
avahi_s_service_browser_free(sb);
1456
1457
if(mc.server != NULL)
1458
avahi_server_free(mc.server);
1459
1460
if(mc.simple_poll != NULL)
1461
avahi_simple_poll_free(mc.simple_poll);
1462
1463
if(gnutls_initialized){
1464
gnutls_certificate_free_credentials(mc.cred);
1465
gnutls_global_deinit();
1466
gnutls_dh_params_deinit(mc.dh_params);
1467
}
1468
1469
if(gpgme_initialized){
1470
gpgme_release(mc.ctx);
1471
}
1472
1473
/* Take down the network interface */
1474
if(take_down_interface){
1475
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1476
if(ret == -1){
1477
perror("ioctl SIOCGIFFLAGS");
1478
} else if(network.ifr_flags & IFF_UP) {
1479
network.ifr_flags &= ~IFF_UP; /* clear flag */
1480
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1481
if(ret == -1){
1482
perror("ioctl SIOCSIFFLAGS");
1483
}
1484
}
1485
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1486
if(ret == -1){
1487
perror("close");
1488
}
1489
}
1490
1491
/* Removes the temp directory used by GPGME */
1492
if(tempdir_created){
1493
DIR *d;
1494
struct dirent *direntry;
1495
d = opendir(tempdir);
1496
if(d == NULL){
1497
if(errno != ENOENT){
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){
1498
1111
perror("opendir");
1499
}
1500
} else {
1501
while(true){
1502
direntry = readdir(d);
1503
if(direntry == NULL){
1504
break;
1505
}
1506
/* Skip "." and ".." */
1507
if(direntry->d_name[0] == '.'
1508
and (direntry->d_name[1] == '\0'
1509
or (direntry->d_name[1] == '.'
1510
and direntry->d_name[2] == '\0'))){
1511
continue;
1512
}
1513
char *fullname = NULL;
1514
ret = asprintf(&fullname, "%s/%s", tempdir,
1515
direntry->d_name);
1516
if(ret < 0){
1517
perror("asprintf");
1518
continue;
1519
}
1520
ret = remove(fullname);
1521
if(ret == -1){
1522
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1523
strerror(errno));
1524
}
1525
free(fullname);
1526
}
1527
closedir(d);
1528
}
1529
ret = rmdir(tempdir);
1530
if(ret == -1 and errno != ENOENT){
1531
perror("rmdir");
1532
}
1533
}
1534
1535
if(quit_now){
1536
sigemptyset(&old_sigterm_action.sa_mask);
1537
old_sigterm_action.sa_handler = SIG_DFL;
1538
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1539
if(ret == -1){
1540
perror("sigaction");
1541
}
1542
raise(signal_received);
1543
}
1544
1545
return exitcode;
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;
1546
1143
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0