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- Committer: Teddy Hogeborn
- Date: 2009-09-17 03:21:20 UTC
- mto: (24.1.142 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 264.
- Revision ID: teddy@fukt.bsnet.se-20090917032120-b4svwsceox2vx38q
* plugins.d/mandos-client.c (start_mandos_communication): Bug fix:
always free
"decrypted_buffer".
Default to
fail unless
success is
achieved.
always free
"decrypted_buffer".
Default to
fail unless
success is
achieved.
- files added:
- NEWS
- files removed:
- debian/mandos-client.config
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008 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
getuid(), getgid(), setuid(),
74
getuid(), getgid(), seteuid(),
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
145
sig_atomic_t quit_now = 0;
146
int signal_received = 0;
147
124
148
/*
125
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
126
* "buffer_capacity" is how much is currently allocated,
149
* Make additional room in "buffer" for at least BUFFER_SIZE more
150
* bytes. "buffer_capacity" is how much is currently allocated,
127
151
* "buffer_length" is how much is already used.
128
152
*/
129
size_t adjustbuffer(char **buffer, size_t buffer_length,
153
size_t incbuffer(char **buffer, size_t buffer_length,
130
154
size_t buffer_capacity){
131
if (buffer_length + BUFFER_SIZE > buffer_capacity){
155
if(buffer_length + BUFFER_SIZE > buffer_capacity){
132
156
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
133
if (buffer == NULL){
157
if(buffer == NULL){
134
158
return 0;
135
159
}
136
160
buffer_capacity += BUFFER_SIZE;
141
165
/*
142
166
* Initialize GPGME.
143
167
*/
144
static bool init_gpgme(mandos_context *mc, const char *seckey,
168
static bool init_gpgme(const char *seckey,
145
169
const char *pubkey, const char *tempdir){
146
int ret;
147
170
gpgme_error_t rc;
148
171
gpgme_engine_info_t engine_info;
149
172
150
173
151
174
/*
152
* Helper function to insert pub and seckey to the enigne keyring.
175
* Helper function to insert pub and seckey to the engine keyring.
153
176
*/
154
177
bool import_key(const char *filename){
178
int ret;
155
179
int fd;
156
180
gpgme_data_t pgp_data;
157
181
158
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
182
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
159
183
if(fd == -1){
160
184
perror("open");
161
185
return false;
162
186
}
163
187
164
188
rc = gpgme_data_new_from_fd(&pgp_data, fd);
165
if (rc != GPG_ERR_NO_ERROR){
189
if(rc != GPG_ERR_NO_ERROR){
166
190
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
167
191
gpgme_strsource(rc), gpgme_strerror(rc));
168
192
return false;
169
193
}
170
194
171
rc = gpgme_op_import(mc->ctx, pgp_data);
172
if (rc != GPG_ERR_NO_ERROR){
195
rc = gpgme_op_import(mc.ctx, pgp_data);
196
if(rc != GPG_ERR_NO_ERROR){
173
197
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
174
198
gpgme_strsource(rc), gpgme_strerror(rc));
175
199
return false;
176
200
}
177
201
178
ret = TEMP_FAILURE_RETRY(close(fd));
202
ret = (int)TEMP_FAILURE_RETRY(close(fd));
179
203
if(ret == -1){
180
204
perror("close");
181
205
}
183
207
return true;
184
208
}
185
209
186
if (debug){
187
fprintf(stderr, "Initialize gpgme\n");
210
if(debug){
211
fprintf(stderr, "Initializing GPGME\n");
188
212
}
189
213
190
214
/* Init GPGME */
191
215
gpgme_check_version(NULL);
192
216
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
193
if (rc != GPG_ERR_NO_ERROR){
217
if(rc != GPG_ERR_NO_ERROR){
194
218
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
195
219
gpgme_strsource(rc), gpgme_strerror(rc));
196
220
return false;
197
221
}
198
222
199
223
/* Set GPGME home directory for the OpenPGP engine only */
200
rc = gpgme_get_engine_info (&engine_info);
201
if (rc != GPG_ERR_NO_ERROR){
224
rc = gpgme_get_engine_info(&engine_info);
225
if(rc != GPG_ERR_NO_ERROR){
202
226
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
203
227
gpgme_strsource(rc), gpgme_strerror(rc));
204
228
return false;
217
241
}
218
242
219
243
/* Create new GPGME "context" */
220
rc = gpgme_new(&(mc->ctx));
221
if (rc != GPG_ERR_NO_ERROR){
244
rc = gpgme_new(&(mc.ctx));
245
if(rc != GPG_ERR_NO_ERROR){
222
246
fprintf(stderr, "bad gpgme_new: %s: %s\n",
223
247
gpgme_strsource(rc), gpgme_strerror(rc));
224
248
return false;
225
249
}
226
250
227
if (not import_key(pubkey) or not import_key(seckey)){
251
if(not import_key(pubkey) or not import_key(seckey)){
228
252
return false;
229
253
}
230
254
231
return true;
255
return true;
232
256
}
233
257
234
258
/*
235
259
* Decrypt OpenPGP data.
236
260
* Returns -1 on error
237
261
*/
238
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
239
const char *cryptotext,
240
size_t crypto_size,
241
char **plaintext){
262
static ssize_t pgp_packet_decrypt(const char *cryptotext,
263
size_t crypto_size,
264
char **plaintext){
242
265
gpgme_data_t dh_crypto, dh_plain;
243
266
gpgme_error_t rc;
244
267
ssize_t ret;
245
268
size_t plaintext_capacity = 0;
246
269
ssize_t plaintext_length = 0;
247
270
248
if (debug){
271
if(debug){
249
272
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
250
273
}
251
274
252
275
/* Create new GPGME data buffer from memory cryptotext */
253
276
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
254
277
0);
255
if (rc != GPG_ERR_NO_ERROR){
278
if(rc != GPG_ERR_NO_ERROR){
256
279
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
257
280
gpgme_strsource(rc), gpgme_strerror(rc));
258
281
return -1;
260
283
261
284
/* Create new empty GPGME data buffer for the plaintext */
262
285
rc = gpgme_data_new(&dh_plain);
263
if (rc != GPG_ERR_NO_ERROR){
286
if(rc != GPG_ERR_NO_ERROR){
264
287
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
265
288
gpgme_strsource(rc), gpgme_strerror(rc));
266
289
gpgme_data_release(dh_crypto);
269
292
270
293
/* Decrypt data from the cryptotext data buffer to the plaintext
271
294
data buffer */
272
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
273
if (rc != GPG_ERR_NO_ERROR){
295
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
296
if(rc != GPG_ERR_NO_ERROR){
274
297
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
275
298
gpgme_strsource(rc), gpgme_strerror(rc));
276
299
plaintext_length = -1;
277
if (debug){
300
if(debug){
278
301
gpgme_decrypt_result_t result;
279
result = gpgme_op_decrypt_result(mc->ctx);
280
if (result == NULL){
302
result = gpgme_op_decrypt_result(mc.ctx);
303
if(result == NULL){
281
304
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
282
305
} else {
283
306
fprintf(stderr, "Unsupported algorithm: %s\n",
289
312
}
290
313
gpgme_recipient_t recipient;
291
314
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
}
315
while(recipient != NULL){
316
fprintf(stderr, "Public key algorithm: %s\n",
317
gpgme_pubkey_algo_name(recipient->pubkey_algo));
318
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
319
fprintf(stderr, "Secret key available: %s\n",
320
recipient->status == GPG_ERR_NO_SECKEY
321
? "No" : "Yes");
322
recipient = recipient->next;
302
323
}
303
324
}
304
325
}
310
331
}
311
332
312
333
/* Seek back to the beginning of the GPGME plaintext data buffer */
313
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
334
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
314
335
perror("gpgme_data_seek");
315
336
plaintext_length = -1;
316
337
goto decrypt_end;
318
339
319
340
*plaintext = NULL;
320
341
while(true){
321
plaintext_capacity = adjustbuffer(plaintext,
342
plaintext_capacity = incbuffer(plaintext,
322
343
(size_t)plaintext_length,
323
344
plaintext_capacity);
324
if (plaintext_capacity == 0){
325
perror("adjustbuffer");
345
if(plaintext_capacity == 0){
346
perror("incbuffer");
326
347
plaintext_length = -1;
327
348
goto decrypt_end;
328
349
}
330
351
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
331
352
BUFFER_SIZE);
332
353
/* Print the data, if any */
333
if (ret == 0){
354
if(ret == 0){
334
355
/* EOF */
335
356
break;
336
357
}
360
381
return plaintext_length;
361
382
}
362
383
363
static const char * safer_gnutls_strerror (int value) {
364
const char *ret = gnutls_strerror (value); /* Spurious warning */
365
if (ret == NULL)
384
static const char * safer_gnutls_strerror(int value){
385
const char *ret = gnutls_strerror(value); /* Spurious warning from
386
-Wunreachable-code */
387
if(ret == NULL)
366
388
ret = "(unknown)";
367
389
return ret;
368
390
}
373
395
fprintf(stderr, "GnuTLS: %s", string);
374
396
}
375
397
376
static int init_gnutls_global(mandos_context *mc,
377
const char *pubkeyfilename,
398
static int init_gnutls_global(const char *pubkeyfilename,
378
399
const char *seckeyfilename){
379
400
int ret;
380
401
383
404
}
384
405
385
406
ret = gnutls_global_init();
386
if (ret != GNUTLS_E_SUCCESS) {
387
fprintf (stderr, "GnuTLS global_init: %s\n",
388
safer_gnutls_strerror(ret));
407
if(ret != GNUTLS_E_SUCCESS){
408
fprintf(stderr, "GnuTLS global_init: %s\n",
409
safer_gnutls_strerror(ret));
389
410
return -1;
390
411
}
391
412
392
if (debug){
413
if(debug){
393
414
/* "Use a log level over 10 to enable all debugging options."
394
415
* - GnuTLS manual
395
416
*/
398
419
}
399
420
400
421
/* 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 ();
422
gnutls_certificate_allocate_credentials(&mc.cred);
423
if(ret != GNUTLS_E_SUCCESS){
424
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
from
426
-Wunreachable-code
427
*/
428
safer_gnutls_strerror(ret));
429
gnutls_global_deinit();
407
430
return -1;
408
431
}
409
432
414
437
}
415
438
416
439
ret = gnutls_certificate_set_openpgp_key_file
417
(mc->cred, pubkeyfilename, seckeyfilename,
440
(mc.cred, pubkeyfilename, seckeyfilename,
418
441
GNUTLS_OPENPGP_FMT_BASE64);
419
if (ret != GNUTLS_E_SUCCESS) {
442
if(ret != GNUTLS_E_SUCCESS){
420
443
fprintf(stderr,
421
444
"Error[%d] while reading the OpenPGP key pair ('%s',"
422
445
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
426
449
}
427
450
428
451
/* 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));
452
ret = gnutls_dh_params_init(&mc.dh_params);
453
if(ret != GNUTLS_E_SUCCESS){
454
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
455
" %s\n", safer_gnutls_strerror(ret));
433
456
goto globalfail;
434
457
}
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));
458
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
459
if(ret != GNUTLS_E_SUCCESS){
460
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
461
safer_gnutls_strerror(ret));
439
462
goto globalfail;
440
463
}
441
464
442
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
465
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
443
466
444
467
return 0;
445
468
446
469
globalfail:
447
470
448
gnutls_certificate_free_credentials(mc->cred);
471
gnutls_certificate_free_credentials(mc.cred);
449
472
gnutls_global_deinit();
450
gnutls_dh_params_deinit(mc->dh_params);
473
gnutls_dh_params_deinit(mc.dh_params);
451
474
return -1;
452
475
}
453
476
454
static int init_gnutls_session(mandos_context *mc,
455
gnutls_session_t *session){
477
static int init_gnutls_session(gnutls_session_t *session){
456
478
int ret;
457
479
/* GnuTLS session creation */
458
ret = gnutls_init(session, GNUTLS_SERVER);
459
if (ret != GNUTLS_E_SUCCESS){
480
do {
481
ret = gnutls_init(session, GNUTLS_SERVER);
482
if(quit_now){
483
return -1;
484
}
485
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
486
if(ret != GNUTLS_E_SUCCESS){
460
487
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
461
488
safer_gnutls_strerror(ret));
462
489
}
463
490
464
491
{
465
492
const char *err;
466
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
467
if (ret != GNUTLS_E_SUCCESS) {
493
do {
494
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
495
if(quit_now){
496
gnutls_deinit(*session);
497
return -1;
498
}
499
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
500
if(ret != GNUTLS_E_SUCCESS){
468
501
fprintf(stderr, "Syntax error at: %s\n", err);
469
502
fprintf(stderr, "GnuTLS error: %s\n",
470
503
safer_gnutls_strerror(ret));
471
gnutls_deinit (*session);
504
gnutls_deinit(*session);
472
505
return -1;
473
506
}
474
507
}
475
508
476
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
477
mc->cred);
478
if (ret != GNUTLS_E_SUCCESS) {
509
do {
510
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
511
mc.cred);
512
if(quit_now){
513
gnutls_deinit(*session);
514
return -1;
515
}
516
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
517
if(ret != GNUTLS_E_SUCCESS){
479
518
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
480
519
safer_gnutls_strerror(ret));
481
gnutls_deinit (*session);
520
gnutls_deinit(*session);
482
521
return -1;
483
522
}
484
523
485
524
/* ignore client certificate if any. */
486
gnutls_certificate_server_set_request (*session,
487
GNUTLS_CERT_IGNORE);
525
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
488
526
489
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
527
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
490
528
491
529
return 0;
492
530
}
498
536
/* Called when a Mandos server is found */
499
537
static int start_mandos_communication(const char *ip, uint16_t port,
500
538
AvahiIfIndex if_index,
501
mandos_context *mc){
502
int ret, tcp_sd;
503
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
539
int af){
540
int ret, tcp_sd = -1;
541
ssize_t sret;
542
union {
543
struct sockaddr_in in;
544
struct sockaddr_in6 in6;
545
} to;
504
546
char *buffer = NULL;
505
char *decrypted_buffer;
547
char *decrypted_buffer = NULL;
506
548
size_t buffer_length = 0;
507
549
size_t buffer_capacity = 0;
508
ssize_t decrypted_buffer_size;
509
550
size_t written;
510
int retval = 0;
511
char interface[IF_NAMESIZE];
551
int retval = -1;
512
552
gnutls_session_t session;
513
514
ret = init_gnutls_session (mc, &session);
515
if (ret != 0){
553
int pf; /* Protocol family */
554
555
if(quit_now){
556
return -1;
557
}
558
559
switch(af){
560
case AF_INET6:
561
pf = PF_INET6;
562
break;
563
case AF_INET:
564
pf = PF_INET;
565
break;
566
default:
567
fprintf(stderr, "Bad address family: %d\n", af);
568
return -1;
569
}
570
571
ret = init_gnutls_session(&session);
572
if(ret != 0){
516
573
return -1;
517
574
}
518
575
519
576
if(debug){
520
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
577
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
521
578
"\n", ip, port);
522
579
}
523
580
524
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
525
if(tcp_sd < 0) {
581
tcp_sd = socket(pf, SOCK_STREAM, 0);
582
if(tcp_sd < 0){
526
583
perror("socket");
527
return -1;
584
goto mandos_end;
528
585
}
529
586
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);
587
if(quit_now){
588
goto mandos_end;
536
589
}
537
590
538
591
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 ){
592
if(af == AF_INET6){
593
to.in6.sin6_family = (sa_family_t)af;
594
ret = inet_pton(af, ip, &to.in6.sin6_addr);
595
} else { /* IPv4 */
596
to.in.sin_family = (sa_family_t)af;
597
ret = inet_pton(af, ip, &to.in.sin_addr);
598
}
599
if(ret < 0 ){
544
600
perror("inet_pton");
545
return -1;
601
goto mandos_end;
546
602
}
547
603
if(ret == 0){
548
604
fprintf(stderr, "Bad address: %s\n", ip);
549
return -1;
550
}
551
to.in6.sin6_port = htons(port); /* Spurious warning */
605
goto mandos_end;
606
}
607
if(af == AF_INET6){
608
to.in6.sin6_port = htons(port); /* Spurious warnings from
609
-Wconversion and
610
-Wunreachable-code */
611
612
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
613
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
614
-Wunreachable-code*/
615
if(if_index == AVAHI_IF_UNSPEC){
616
fprintf(stderr, "An IPv6 link-local address is incomplete"
617
" without a network interface\n");
618
goto mandos_end;
619
}
620
/* Set the network interface number as scope */
621
to.in6.sin6_scope_id = (uint32_t)if_index;
622
}
623
} else {
624
to.in.sin_port = htons(port); /* Spurious warnings from
625
-Wconversion and
626
-Wunreachable-code */
627
}
552
628
553
to.in6.sin6_scope_id = (uint32_t)if_index;
629
if(quit_now){
630
goto mandos_end;
631
}
554
632
555
633
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){
634
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
635
char interface[IF_NAMESIZE];
636
if(if_indextoname((unsigned int)if_index, interface) == NULL){
637
perror("if_indextoname");
638
} else {
639
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
640
ip, interface, port);
641
}
642
} else {
643
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
644
port);
645
}
646
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
647
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
648
const char *pcret;
649
if(af == AF_INET6){
650
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
651
sizeof(addrstr));
652
} else {
653
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
654
sizeof(addrstr));
655
}
656
if(pcret == NULL){
561
657
perror("inet_ntop");
562
658
} else {
563
659
if(strcmp(addrstr, ip) != 0){
566
662
}
567
663
}
568
664
569
ret = connect(tcp_sd, &to.in, sizeof(to));
570
if (ret < 0){
665
if(quit_now){
666
goto mandos_end;
667
}
668
669
if(af == AF_INET6){
670
ret = connect(tcp_sd, &to.in6, sizeof(to));
671
} else {
672
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
673
}
674
if(ret < 0){
571
675
perror("connect");
572
return -1;
676
goto mandos_end;
677
}
678
679
if(quit_now){
680
goto mandos_end;
573
681
}
574
682
575
683
const char *out = mandos_protocol_version;
576
684
written = 0;
577
while (true){
685
while(true){
578
686
size_t out_size = strlen(out);
579
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
687
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
580
688
out_size - written));
581
if (ret == -1){
689
if(ret == -1){
582
690
perror("write");
583
retval = -1;
584
691
goto mandos_end;
585
692
}
586
693
written += (size_t)ret;
587
694
if(written < out_size){
588
695
continue;
589
696
} else {
590
if (out == mandos_protocol_version){
697
if(out == mandos_protocol_version){
591
698
written = 0;
592
699
out = "\r\n";
593
700
} else {
594
701
break;
595
702
}
596
703
}
704
705
if(quit_now){
706
goto mandos_end;
707
}
597
708
}
598
709
599
710
if(debug){
600
711
fprintf(stderr, "Establishing TLS session with %s\n", ip);
601
712
}
602
713
603
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
604
605
do{
606
ret = gnutls_handshake (session);
714
if(quit_now){
715
goto mandos_end;
716
}
717
718
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
719
720
if(quit_now){
721
goto mandos_end;
722
}
723
724
do {
725
ret = gnutls_handshake(session);
726
if(quit_now){
727
goto mandos_end;
728
}
607
729
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
608
730
609
if (ret != GNUTLS_E_SUCCESS){
731
if(ret != GNUTLS_E_SUCCESS){
610
732
if(debug){
611
733
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
612
gnutls_perror (ret);
734
gnutls_perror(ret);
613
735
}
614
retval = -1;
615
736
goto mandos_end;
616
737
}
617
738
618
739
/* Read OpenPGP packet that contains the wanted password */
619
740
620
741
if(debug){
621
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
742
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
622
743
ip);
623
744
}
624
745
625
746
while(true){
626
buffer_capacity = adjustbuffer(&buffer, buffer_length,
747
748
if(quit_now){
749
goto mandos_end;
750
}
751
752
buffer_capacity = incbuffer(&buffer, buffer_length,
627
753
buffer_capacity);
628
if (buffer_capacity == 0){
629
perror("adjustbuffer");
630
retval = -1;
631
goto mandos_end;
632
}
633
634
ret = gnutls_record_recv(session, buffer+buffer_length,
635
BUFFER_SIZE);
636
if (ret == 0){
754
if(buffer_capacity == 0){
755
perror("incbuffer");
756
goto mandos_end;
757
}
758
759
if(quit_now){
760
goto mandos_end;
761
}
762
763
sret = gnutls_record_recv(session, buffer+buffer_length,
764
BUFFER_SIZE);
765
if(sret == 0){
637
766
break;
638
767
}
639
if (ret < 0){
640
switch(ret){
768
if(sret < 0){
769
switch(sret){
641
770
case GNUTLS_E_INTERRUPTED:
642
771
case GNUTLS_E_AGAIN:
643
772
break;
644
773
case GNUTLS_E_REHANDSHAKE:
645
do{
646
ret = gnutls_handshake (session);
774
do {
775
ret = gnutls_handshake(session);
776
777
if(quit_now){
778
goto mandos_end;
779
}
647
780
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
648
if (ret < 0){
781
if(ret < 0){
649
782
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
650
gnutls_perror (ret);
651
retval = -1;
783
gnutls_perror(ret);
652
784
goto mandos_end;
653
785
}
654
786
break;
655
787
default:
656
788
fprintf(stderr, "Unknown error while reading data from"
657
789
" encrypted session with Mandos server\n");
658
retval = -1;
659
gnutls_bye (session, GNUTLS_SHUT_RDWR);
790
gnutls_bye(session, GNUTLS_SHUT_RDWR);
660
791
goto mandos_end;
661
792
}
662
793
} else {
663
buffer_length += (size_t) ret;
794
buffer_length += (size_t) sret;
664
795
}
665
796
}
666
797
668
799
fprintf(stderr, "Closing TLS session\n");
669
800
}
670
801
671
gnutls_bye (session, GNUTLS_SHUT_RDWR);
672
673
if (buffer_length > 0){
674
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
802
if(quit_now){
803
goto mandos_end;
804
}
805
806
do {
807
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
808
if(quit_now){
809
goto mandos_end;
810
}
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
813
if(buffer_length > 0){
814
ssize_t decrypted_buffer_size;
815
decrypted_buffer_size = pgp_packet_decrypt(buffer,
675
816
buffer_length,
676
817
&decrypted_buffer);
677
if (decrypted_buffer_size >= 0){
818
if(decrypted_buffer_size >= 0){
819
678
820
written = 0;
679
821
while(written < (size_t) decrypted_buffer_size){
680
ret = (int)fwrite (decrypted_buffer + written, 1,
681
(size_t)decrypted_buffer_size - written,
682
stdout);
822
if(quit_now){
823
goto mandos_end;
824
}
825
826
ret = (int)fwrite(decrypted_buffer + written, 1,
827
(size_t)decrypted_buffer_size - written,
828
stdout);
683
829
if(ret == 0 and ferror(stdout)){
684
830
if(debug){
685
831
fprintf(stderr, "Error writing encrypted data: %s\n",
686
832
strerror(errno));
687
833
}
688
retval = -1;
689
break;
834
goto mandos_end;
690
835
}
691
836
written += (size_t)ret;
692
837
}
693
free(decrypted_buffer);
694
} else {
695
retval = -1;
838
retval = 0;
696
839
}
697
} else {
698
retval = -1;
699
840
}
700
841
701
842
/* Shutdown procedure */
702
843
703
844
mandos_end:
845
free(decrypted_buffer);
704
846
free(buffer);
705
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
847
if(tcp_sd >= 0){
848
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
849
}
706
850
if(ret == -1){
707
851
perror("close");
708
852
}
709
gnutls_deinit (session);
853
gnutls_deinit(session);
854
if(quit_now){
855
retval = -1;
856
}
710
857
return retval;
711
858
}
712
859
713
860
static void resolve_callback(AvahiSServiceResolver *r,
714
861
AvahiIfIndex interface,
715
AVAHI_GCC_UNUSED AvahiProtocol protocol,
862
AvahiProtocol proto,
716
863
AvahiResolverEvent event,
717
864
const char *name,
718
865
const char *type,
723
870
AVAHI_GCC_UNUSED AvahiStringList *txt,
724
871
AVAHI_GCC_UNUSED AvahiLookupResultFlags
725
872
flags,
726
void* userdata) {
727
mandos_context *mc = userdata;
873
AVAHI_GCC_UNUSED void* userdata){
728
874
assert(r);
729
875
730
876
/* Called whenever a service has been resolved successfully or
731
877
timed out */
732
878
733
switch (event) {
879
if(quit_now){
880
return;
881
}
882
883
switch(event){
734
884
default:
735
885
case AVAHI_RESOLVER_FAILURE:
736
886
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
737
887
" of type '%s' in domain '%s': %s\n", name, type, domain,
738
avahi_strerror(avahi_server_errno(mc->server)));
888
avahi_strerror(avahi_server_errno(mc.server)));
739
889
break;
740
890
741
891
case AVAHI_RESOLVER_FOUND:
744
894
avahi_address_snprint(ip, sizeof(ip), address);
745
895
if(debug){
746
896
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
747
PRIu16 ") on port %d\n", name, host_name, ip,
748
interface, port);
897
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
898
ip, (intmax_t)interface, port);
749
899
}
750
int ret = start_mandos_communication(ip, port, interface, mc);
751
if (ret == 0){
752
avahi_simple_poll_quit(mc->simple_poll);
900
int ret = start_mandos_communication(ip, port, interface,
901
avahi_proto_to_af(proto));
902
if(ret == 0){
903
avahi_simple_poll_quit(mc.simple_poll);
753
904
}
754
905
}
755
906
}
756
907
avahi_s_service_resolver_free(r);
757
908
}
758
909
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;
910
static void browse_callback(AvahiSServiceBrowser *b,
911
AvahiIfIndex interface,
912
AvahiProtocol protocol,
913
AvahiBrowserEvent event,
914
const char *name,
915
const char *type,
916
const char *domain,
917
AVAHI_GCC_UNUSED AvahiLookupResultFlags
918
flags,
919
AVAHI_GCC_UNUSED void* userdata){
770
920
assert(b);
771
921
772
922
/* Called whenever a new services becomes available on the LAN or
773
923
is removed from the LAN */
774
924
775
switch (event) {
925
if(quit_now){
926
return;
927
}
928
929
switch(event){
776
930
default:
777
931
case AVAHI_BROWSER_FAILURE:
778
932
779
933
fprintf(stderr, "(Avahi browser) %s\n",
780
avahi_strerror(avahi_server_errno(mc->server)));
781
avahi_simple_poll_quit(mc->simple_poll);
934
avahi_strerror(avahi_server_errno(mc.server)));
935
avahi_simple_poll_quit(mc.simple_poll);
782
936
return;
783
937
784
938
case AVAHI_BROWSER_NEW:
787
941
the callback function is called the Avahi server will free the
788
942
resolver for us. */
789
943
790
if (!(avahi_s_service_resolver_new(mc->server, interface,
791
protocol, name, type, domain,
792
AVAHI_PROTO_INET6, 0,
793
resolve_callback, mc)))
944
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
945
name, type, domain, protocol, 0,
946
resolve_callback, NULL) == NULL)
794
947
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
795
name, avahi_strerror(avahi_server_errno(mc->server)));
948
name, avahi_strerror(avahi_server_errno(mc.server)));
796
949
break;
797
950
798
951
case AVAHI_BROWSER_REMOVE:
807
960
}
808
961
}
809
962
963
/* stop main loop after sigterm has been called */
964
static void handle_sigterm(int sig){
965
if(quit_now){
966
return;
967
}
968
quit_now = 1;
969
signal_received = sig;
970
int old_errno = errno;
971
if(mc.simple_poll != NULL){
972
avahi_simple_poll_quit(mc.simple_poll);
973
}
974
errno = old_errno;
975
}
976
810
977
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);
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
978
AvahiSServiceBrowser *sb = NULL;
979
int error;
980
int ret;
981
intmax_t tmpmax;
982
char *tmp;
983
int exitcode = EXIT_SUCCESS;
984
const char *interface = "eth0";
985
struct ifreq network;
986
int sd = -1;
987
bool take_down_interface = false;
988
uid_t uid;
989
gid_t gid;
990
char *connect_to = NULL;
991
char tempdir[] = "/tmp/mandosXXXXXX";
992
bool tempdir_created = false;
993
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
994
const char *seckey = PATHDIR "/" SECKEY;
995
const char *pubkey = PATHDIR "/" PUBKEY;
996
997
bool gnutls_initialized = false;
998
bool gpgme_initialized = false;
999
float delay = 2.5f;
1000
1001
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1002
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1003
1004
uid = getuid();
1005
gid = getgid();
1006
1007
/* Lower any group privileges we might have, just to be safe */
1008
errno = 0;
1009
ret = setgid(gid);
1010
if(ret == -1){
1011
perror("setgid");
1012
}
1013
1014
/* Lower user privileges (temporarily) */
1015
errno = 0;
1016
ret = seteuid(uid);
1017
if(ret == -1){
1018
perror("seteuid");
1019
}
1020
1021
if(quit_now){
1022
goto end;
1023
}
1024
1025
{
1026
struct argp_option options[] = {
1027
{ .name = "debug", .key = 128,
1028
.doc = "Debug mode", .group = 3 },
1029
{ .name = "connect", .key = 'c',
1030
.arg = "ADDRESS:PORT",
1031
.doc = "Connect directly to a specific Mandos server",
1032
.group = 1 },
1033
{ .name = "interface", .key = 'i',
1034
.arg = "NAME",
1035
.doc = "Network interface that will be used to search for"
1036
" Mandos servers",
1037
.group = 1 },
1038
{ .name = "seckey", .key = 's',
1039
.arg = "FILE",
1040
.doc = "OpenPGP secret key file base name",
1041
.group = 1 },
1042
{ .name = "pubkey", .key = 'p',
1043
.arg = "FILE",
1044
.doc = "OpenPGP public key file base name",
1045
.group = 2 },
1046
{ .name = "dh-bits", .key = 129,
1047
.arg = "BITS",
1048
.doc = "Bit length of the prime number used in the"
1049
" Diffie-Hellman key exchange",
1050
.group = 2 },
1051
{ .name = "priority", .key = 130,
1052
.arg = "STRING",
1053
.doc = "GnuTLS priority string for the TLS handshake",
1054
.group = 1 },
1055
{ .name = "delay", .key = 131,
1056
.arg = "SECONDS",
1057
.doc = "Maximum delay to wait for interface startup",
1058
.group = 2 },
1059
{ .name = NULL }
1060
};
1061
1062
error_t parse_opt(int key, char *arg,
1063
struct argp_state *state){
1064
switch(key){
1065
case 128: /* --debug */
1066
debug = true;
1067
break;
1068
case 'c': /* --connect */
1069
connect_to = arg;
1070
break;
1071
case 'i': /* --interface */
1072
interface = arg;
1073
break;
1074
case 's': /* --seckey */
1075
seckey = arg;
1076
break;
1077
case 'p': /* --pubkey */
1078
pubkey = arg;
1079
break;
1080
case 129: /* --dh-bits */
1081
errno = 0;
1082
tmpmax = strtoimax(arg, &tmp, 10);
1083
if(errno != 0 or tmp == arg or *tmp != '\0'
1084
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1085
fprintf(stderr, "Bad number of DH bits\n");
1086
exit(EXIT_FAILURE);
1087
}
1088
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1089
break;
1090
case 130: /* --priority */
1091
mc.priority = arg;
1092
break;
1093
case 131: /* --delay */
1094
errno = 0;
1095
delay = strtof(arg, &tmp);
1096
if(errno != 0 or tmp == arg or *tmp != '\0'){
1097
fprintf(stderr, "Bad delay\n");
1098
exit(EXIT_FAILURE);
1099
}
1100
break;
1101
case ARGP_KEY_ARG:
1102
argp_usage(state);
1103
case ARGP_KEY_END:
1104
break;
1105
default:
1106
return ARGP_ERR_UNKNOWN;
1107
}
1108
return 0;
1109
}
1110
1111
struct argp argp = { .options = options, .parser = parse_opt,
1112
.args_doc = "",
1113
.doc = "Mandos client -- Get and decrypt"
1114
" passwords from a Mandos server" };
1115
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1116
if(ret == ARGP_ERR_UNKNOWN){
1117
fprintf(stderr, "Unknown error while parsing arguments\n");
1118
exitcode = EXIT_FAILURE;
1119
goto end;
1120
}
1121
}
1122
1123
if(not debug){
1124
avahi_set_log_function(empty_log);
1125
}
1126
1127
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1128
from the signal handler */
1129
/* Initialize the pseudo-RNG for Avahi */
1130
srand((unsigned int) time(NULL));
1131
mc.simple_poll = avahi_simple_poll_new();
1132
if(mc.simple_poll == NULL){
1133
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1134
exitcode = EXIT_FAILURE;
1135
goto end;
1136
}
1137
1138
sigemptyset(&sigterm_action.sa_mask);
1139
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1140
if(ret == -1){
1141
perror("sigaddset");
1142
exitcode = EXIT_FAILURE;
1143
goto end;
1144
}
1145
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1146
if(ret == -1){
1147
perror("sigaddset");
1148
exitcode = EXIT_FAILURE;
1149
goto end;
1150
}
1151
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1152
if(ret == -1){
1153
perror("sigaddset");
1154
exitcode = EXIT_FAILURE;
1155
goto end;
1156
}
1157
/* Need to check if the handler is SIG_IGN before handling:
1158
| [[info:libc:Initial Signal Actions]] |
1159
| [[info:libc:Basic Signal Handling]] |
1160
*/
1161
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1162
if(ret == -1){
1163
perror("sigaction");
1164
return EXIT_FAILURE;
1165
}
1166
if(old_sigterm_action.sa_handler != SIG_IGN){
1167
ret = sigaction(SIGINT, &sigterm_action, NULL);
1168
if(ret == -1){
1169
perror("sigaction");
1170
exitcode = EXIT_FAILURE;
1171
goto end;
1172
}
1173
}
1174
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1175
if(ret == -1){
1176
perror("sigaction");
1177
return EXIT_FAILURE;
1178
}
1179
if(old_sigterm_action.sa_handler != SIG_IGN){
1180
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1181
if(ret == -1){
1182
perror("sigaction");
1183
exitcode = EXIT_FAILURE;
1184
goto end;
1185
}
1186
}
1187
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1188
if(ret == -1){
1189
perror("sigaction");
1190
return EXIT_FAILURE;
1191
}
1192
if(old_sigterm_action.sa_handler != SIG_IGN){
1193
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1194
if(ret == -1){
1195
perror("sigaction");
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
1199
}
1200
1201
/* If the interface is down, bring it up */
1202
if(interface[0] != '\0'){
984
1203
if_index = (AvahiIfIndex) if_nametoindex(interface);
985
1204
if(if_index == 0){
986
1205
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
1206
exitcode = EXIT_FAILURE;
1207
goto end;
1208
}
1209
1210
if(quit_now){
1211
goto end;
1212
}
1213
1214
/* Re-raise priviliges */
1215
errno = 0;
1216
ret = seteuid(0);
1217
if(ret == -1){
1218
perror("seteuid");
1219
}
1220
1221
#ifdef __linux__
1222
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1223
messages to mess up the prompt */
1224
ret = klogctl(8, NULL, 5);
1225
bool restore_loglevel = true;
1226
if(ret == -1){
1227
restore_loglevel = false;
1228
perror("klogctl");
1229
}
1230
#endif /* __linux__ */
1231
1232
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1233
if(sd < 0){
1234
perror("socket");
1235
exitcode = EXIT_FAILURE;
1236
#ifdef __linux__
1237
if(restore_loglevel){
1238
ret = klogctl(7, NULL, 0);
1239
if(ret == -1){
1240
perror("klogctl");
1241
}
1242
}
1243
#endif /* __linux__ */
1244
/* Lower privileges */
1245
errno = 0;
1246
ret = seteuid(uid);
1247
if(ret == -1){
1248
perror("seteuid");
1249
}
1250
goto end;
1251
}
1252
strcpy(network.ifr_name, interface);
1253
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1254
if(ret == -1){
1255
perror("ioctl SIOCGIFFLAGS");
1256
#ifdef __linux__
1257
if(restore_loglevel){
1258
ret = klogctl(7, NULL, 0);
1259
if(ret == -1){
1260
perror("klogctl");
1261
}
1262
}
1263
#endif /* __linux__ */
1264
exitcode = EXIT_FAILURE;
1265
/* Lower privileges */
1266
errno = 0;
1267
ret = seteuid(uid);
1268
if(ret == -1){
1269
perror("seteuid");
1270
}
1271
goto end;
1272
}
1273
if((network.ifr_flags & IFF_UP) == 0){
1274
network.ifr_flags |= IFF_UP;
1275
take_down_interface = true;
1276
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1277
if(ret == -1){
1278
take_down_interface = false;
1279
perror("ioctl SIOCSIFFLAGS");
1280
exitcode = EXIT_FAILURE;
1281
#ifdef __linux__
1282
if(restore_loglevel){
1283
ret = klogctl(7, NULL, 0);
1284
if(ret == -1){
1285
perror("klogctl");
1286
}
1287
}
1288
#endif /* __linux__ */
1289
/* Lower privileges */
1290
errno = 0;
1291
ret = seteuid(uid);
1292
if(ret == -1){
1293
perror("seteuid");
1294
}
1295
goto end;
1296
}
1297
}
1298
/* sleep checking until interface is running */
1299
for(int i=0; i < delay * 4; i++){
1300
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1301
if(ret == -1){
1302
perror("ioctl SIOCGIFFLAGS");
1303
} else if(network.ifr_flags & IFF_RUNNING){
1304
break;
1305
}
1306
struct timespec sleeptime = { .tv_nsec = 250000000 };
1307
ret = nanosleep(&sleeptime, NULL);
1308
if(ret == -1 and errno != EINTR){
1309
perror("nanosleep");
1310
}
1311
}
1312
if(not take_down_interface){
1313
/* We won't need the socket anymore */
1314
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1315
if(ret == -1){
1316
perror("close");
1317
}
1318
}
1319
#ifdef __linux__
1320
if(restore_loglevel){
1321
/* Restores kernel loglevel to default */
1322
ret = klogctl(7, NULL, 0);
1323
if(ret == -1){
1324
perror("klogctl");
1325
}
1326
}
1327
#endif /* __linux__ */
1328
/* Lower privileges */
1329
errno = 0;
1330
if(take_down_interface){
1331
/* Lower privileges */
1332
ret = seteuid(uid);
1333
if(ret == -1){
1334
perror("seteuid");
1335
}
1336
} else {
1337
/* Lower privileges permanently */
1338
ret = setuid(uid);
1339
if(ret == -1){
1340
perror("setuid");
1341
}
1342
}
1343
}
1344
1345
if(quit_now){
1346
goto end;
1347
}
1348
1349
ret = init_gnutls_global(pubkey, seckey);
1350
if(ret == -1){
1351
fprintf(stderr, "init_gnutls_global failed\n");
1352
exitcode = EXIT_FAILURE;
1353
goto end;
1354
} else {
1355
gnutls_initialized = true;
1356
}
1357
1358
if(quit_now){
1359
goto end;
1360
}
1361
1362
tempdir_created = true;
1363
if(mkdtemp(tempdir) == NULL){
1364
tempdir_created = false;
1365
perror("mkdtemp");
1366
goto end;
1367
}
1368
1369
if(quit_now){
1370
goto end;
1371
}
1372
1373
if(not init_gpgme(pubkey, seckey, tempdir)){
1374
fprintf(stderr, "init_gpgme failed\n");
1375
exitcode = EXIT_FAILURE;
1376
goto end;
1377
} else {
1378
gpgme_initialized = true;
1379
}
1380
1381
if(quit_now){
1382
goto end;
1383
}
1384
1385
if(connect_to != NULL){
1386
/* Connect directly, do not use Zeroconf */
1387
/* (Mainly meant for debugging) */
1388
char *address = strrchr(connect_to, ':');
1389
if(address == NULL){
1390
fprintf(stderr, "No colon in address\n");
1391
exitcode = EXIT_FAILURE;
1392
goto end;
1393
}
1394
1395
if(quit_now){
1396
goto end;
1397
}
1398
1399
uint16_t port;
1400
errno = 0;
1401
tmpmax = strtoimax(address+1, &tmp, 10);
1402
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1403
or tmpmax != (uint16_t)tmpmax){
1404
fprintf(stderr, "Bad port number\n");
1405
exitcode = EXIT_FAILURE;
1406
goto end;
1407
}
1408
1409
if(quit_now){
1410
goto end;
1411
}
1412
1413
port = (uint16_t)tmpmax;
1414
*address = '\0';
1415
address = connect_to;
1416
/* Colon in address indicates IPv6 */
1417
int af;
1418
if(strchr(address, ':') != NULL){
1419
af = AF_INET6;
1420
} else {
1421
af = AF_INET;
1422
}
1423
1424
if(quit_now){
1425
goto end;
1426
}
1427
1428
ret = start_mandos_communication(address, port, if_index, af);
1429
if(ret < 0){
1430
exitcode = EXIT_FAILURE;
1431
} else {
1432
exitcode = EXIT_SUCCESS;
1433
}
1434
goto end;
1435
}
1436
1437
if(quit_now){
1438
goto end;
1439
}
1440
1441
{
1442
AvahiServerConfig config;
1443
/* Do not publish any local Zeroconf records */
1444
avahi_server_config_init(&config);
1445
config.publish_hinfo = 0;
1446
config.publish_addresses = 0;
1447
config.publish_workstation = 0;
1448
config.publish_domain = 0;
1449
1450
/* Allocate a new server */
1451
mc.server = avahi_server_new(avahi_simple_poll_get
1452
(mc.simple_poll), &config, NULL,
1453
NULL, &error);
1454
1455
/* Free the Avahi configuration data */
1456
avahi_server_config_free(&config);
1457
}
1458
1459
/* Check if creating the Avahi server object succeeded */
1460
if(mc.server == NULL){
1461
fprintf(stderr, "Failed to create Avahi server: %s\n",
1462
avahi_strerror(error));
1463
exitcode = EXIT_FAILURE;
1464
goto end;
1465
}
1466
1467
if(quit_now){
1468
goto end;
1469
}
1470
1471
/* Create the Avahi service browser */
1472
sb = avahi_s_service_browser_new(mc.server, if_index,
1473
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1474
NULL, 0, browse_callback, NULL);
1475
if(sb == NULL){
1476
fprintf(stderr, "Failed to create service browser: %s\n",
1477
avahi_strerror(avahi_server_errno(mc.server)));
1478
exitcode = EXIT_FAILURE;
1479
goto end;
1480
}
1481
1482
if(quit_now){
1483
goto end;
1484
}
1485
1486
/* Run the main loop */
1487
1488
if(debug){
1489
fprintf(stderr, "Starting Avahi loop search\n");
1490
}
1491
1492
avahi_simple_poll_loop(mc.simple_poll);
1493
1079
1494
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){
1495
1496
if(debug){
1497
fprintf(stderr, "%s exiting\n", argv[0]);
1498
}
1499
1500
/* Cleanup things */
1501
if(sb != NULL)
1502
avahi_s_service_browser_free(sb);
1503
1504
if(mc.server != NULL)
1505
avahi_server_free(mc.server);
1506
1507
if(mc.simple_poll != NULL)
1508
avahi_simple_poll_free(mc.simple_poll);
1509
1510
if(gnutls_initialized){
1511
gnutls_certificate_free_credentials(mc.cred);
1512
gnutls_global_deinit();
1513
gnutls_dh_params_deinit(mc.dh_params);
1514
}
1515
1516
if(gpgme_initialized){
1517
gpgme_release(mc.ctx);
1518
}
1519
1520
/* Take down the network interface */
1521
if(take_down_interface){
1522
/* Re-raise priviliges */
1523
errno = 0;
1524
ret = seteuid(0);
1525
if(ret == -1){
1526
perror("seteuid");
1527
}
1528
if(geteuid() == 0){
1529
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1530
if(ret == -1){
1531
perror("ioctl SIOCGIFFLAGS");
1532
} else if(network.ifr_flags & IFF_UP) {
1533
network.ifr_flags &= ~IFF_UP; /* clear flag */
1534
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1535
if(ret == -1){
1536
perror("ioctl SIOCSIFFLAGS");
1537
}
1538
}
1539
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1540
if(ret == -1){
1541
perror("close");
1542
}
1543
/* Lower privileges permanently */
1544
errno = 0;
1545
ret = setuid(uid);
1546
if(ret == -1){
1547
perror("setuid");
1548
}
1549
}
1550
}
1551
1552
/* Removes the temp directory used by GPGME */
1553
if(tempdir_created){
1554
DIR *d;
1555
struct dirent *direntry;
1556
d = opendir(tempdir);
1557
if(d == NULL){
1558
if(errno != ENOENT){
1111
1559
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;
1560
}
1561
} else {
1562
while(true){
1563
direntry = readdir(d);
1564
if(direntry == NULL){
1565
break;
1566
}
1567
/* Skip "." and ".." */
1568
if(direntry->d_name[0] == '.'
1569
and (direntry->d_name[1] == '\0'
1570
or (direntry->d_name[1] == '.'
1571
and direntry->d_name[2] == '\0'))){
1572
continue;
1573
}
1574
char *fullname = NULL;
1575
ret = asprintf(&fullname, "%s/%s", tempdir,
1576
direntry->d_name);
1577
if(ret < 0){
1578
perror("asprintf");
1579
continue;
1580
}
1581
ret = remove(fullname);
1582
if(ret == -1){
1583
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1584
strerror(errno));
1585
}
1586
free(fullname);
1587
}
1588
closedir(d);
1589
}
1590
ret = rmdir(tempdir);
1591
if(ret == -1 and errno != ENOENT){
1592
perror("rmdir");
1593
}
1594
}
1595
1596
if(quit_now){
1597
sigemptyset(&old_sigterm_action.sa_mask);
1598
old_sigterm_action.sa_handler = SIG_DFL;
1599
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1600
if(ret == -1){
1601
perror("sigaction");
1602
}
1603
raise(signal_received);
1604
}
1605
1606
return exitcode;
1143
1607
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0