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- Committer: Björn Påhlsson
- Date: 2009-09-07 22:21:35 UTC
- mfrom: (358 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 415.
- Revision ID: belorn@braxen-20090907222135-pk7qmvsg3bmqqo5i
merge
- files added:
- NEWS
- debian/po
- files removed:
- etc-plugins.d-README
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
38
#endif
34
39
35
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
41
37
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
43
stdout, ferror(), remove() */
39
44
#include <stdint.h> /* uint16_t, uint32_t */
40
45
#include <stddef.h> /* NULL, size_t, ssize_t */
41
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
47
srand(), strtof() */
48
#include <stdbool.h> /* bool, false, true */
44
49
#include <string.h> /* memset(), strcmp(), strlen(),
45
50
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
47
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
53
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
51
56
#include <sys/stat.h> /* open() */
52
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
58
inet_pton(), connect() */
55
59
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
58
64
#include <assert.h> /* assert() */
59
65
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
66
#include <time.h> /* nanosleep(), time() */
61
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
62
68
SIOCSIFFLAGS, if_indextoname(),
63
69
if_nametoindex(), IF_NAMESIZE */
64
#include <netinet/in.h>
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
65
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
66
74
getuid(), getgid(), setuid(),
67
75
setgid() */
68
76
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
77
#include <iso646.h> /* not, or, and */
70
78
#include <argp.h> /* struct argp_option, error_t, struct
71
79
argp_state, struct argp,
72
80
argp_parse(), ARGP_KEY_ARG,
73
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
74
89
75
90
/* Avahi */
76
91
/* All Avahi types, constants and functions
89
104
gnutls_*
90
105
init_gnutls_session(),
91
106
GNUTLS_* */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
93
109
GNUTLS_OPENPGP_FMT_BASE64 */
94
110
95
111
/* GPGME */
101
117
102
118
#define BUFFER_SIZE 256
103
119
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
108
120
#define PATHDIR "/conf/conf.d/mandos"
109
121
#define SECKEY "seckey.txt"
110
122
#define PUBKEY "pubkey.txt"
111
123
112
124
bool debug = false;
113
125
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "mandos-client 1.0";
126
const char *argp_program_version = "mandos-client " VERSION;
115
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
116
128
117
129
/* Used for passing in values through the Avahi callback functions */
125
137
gpgme_ctx_t ctx;
126
138
} mandos_context;
127
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
128
145
/*
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
131
148
* "buffer_length" is how much is already used.
132
149
*/
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
150
size_t incbuffer(char **buffer, size_t buffer_length,
134
151
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
136
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if (buffer == NULL){
154
if(buffer == NULL){
138
155
return 0;
139
156
}
140
157
buffer_capacity += BUFFER_SIZE;
145
162
/*
146
163
* Initialize GPGME.
147
164
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
165
static bool init_gpgme(const char *seckey,
149
166
const char *pubkey, const char *tempdir){
150
167
int ret;
151
168
gpgme_error_t rc;
153
170
154
171
155
172
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
173
* Helper function to insert pub and seckey to the engine keyring.
157
174
*/
158
175
bool import_key(const char *filename){
159
176
int fd;
160
177
gpgme_data_t pgp_data;
161
178
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
180
if(fd == -1){
164
181
perror("open");
165
182
return false;
166
183
}
167
184
168
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
if (rc != GPG_ERR_NO_ERROR){
186
if(rc != GPG_ERR_NO_ERROR){
170
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
188
gpgme_strsource(rc), gpgme_strerror(rc));
172
189
return false;
173
190
}
174
191
175
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if (rc != GPG_ERR_NO_ERROR){
192
rc = gpgme_op_import(mc.ctx, pgp_data);
193
if(rc != GPG_ERR_NO_ERROR){
177
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
195
gpgme_strsource(rc), gpgme_strerror(rc));
179
196
return false;
180
197
}
181
198
182
ret = TEMP_FAILURE_RETRY(close(fd));
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
183
200
if(ret == -1){
184
201
perror("close");
185
202
}
187
204
return true;
188
205
}
189
206
190
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
207
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
192
209
}
193
210
194
211
/* Init GPGME */
195
212
gpgme_check_version(NULL);
196
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
if (rc != GPG_ERR_NO_ERROR){
214
if(rc != GPG_ERR_NO_ERROR){
198
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
216
gpgme_strsource(rc), gpgme_strerror(rc));
200
217
return false;
201
218
}
202
219
203
220
/* Set GPGME home directory for the OpenPGP engine only */
204
rc = gpgme_get_engine_info (&engine_info);
205
if (rc != GPG_ERR_NO_ERROR){
221
rc = gpgme_get_engine_info(&engine_info);
222
if(rc != GPG_ERR_NO_ERROR){
206
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
224
gpgme_strsource(rc), gpgme_strerror(rc));
208
225
return false;
221
238
}
222
239
223
240
/* Create new GPGME "context" */
224
rc = gpgme_new(&(mc->ctx));
225
if (rc != GPG_ERR_NO_ERROR){
241
rc = gpgme_new(&(mc.ctx));
242
if(rc != GPG_ERR_NO_ERROR){
226
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
244
gpgme_strsource(rc), gpgme_strerror(rc));
228
245
return false;
229
246
}
230
247
231
if (not import_key(pubkey) or not import_key(seckey)){
248
if(not import_key(pubkey) or not import_key(seckey)){
232
249
return false;
233
250
}
234
251
235
return true;
252
return true;
236
253
}
237
254
238
255
/*
239
256
* Decrypt OpenPGP data.
240
257
* Returns -1 on error
241
258
*/
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
size_t crypto_size,
261
char **plaintext){
246
262
gpgme_data_t dh_crypto, dh_plain;
247
263
gpgme_error_t rc;
248
264
ssize_t ret;
249
265
size_t plaintext_capacity = 0;
250
266
ssize_t plaintext_length = 0;
251
267
252
if (debug){
268
if(debug){
253
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
254
270
}
255
271
256
272
/* Create new GPGME data buffer from memory cryptotext */
257
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
274
0);
259
if (rc != GPG_ERR_NO_ERROR){
275
if(rc != GPG_ERR_NO_ERROR){
260
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
277
gpgme_strsource(rc), gpgme_strerror(rc));
262
278
return -1;
264
280
265
281
/* Create new empty GPGME data buffer for the plaintext */
266
282
rc = gpgme_data_new(&dh_plain);
267
if (rc != GPG_ERR_NO_ERROR){
283
if(rc != GPG_ERR_NO_ERROR){
268
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
285
gpgme_strsource(rc), gpgme_strerror(rc));
270
286
gpgme_data_release(dh_crypto);
273
289
274
290
/* Decrypt data from the cryptotext data buffer to the plaintext
275
291
data buffer */
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if (rc != GPG_ERR_NO_ERROR){
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
278
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
295
gpgme_strsource(rc), gpgme_strerror(rc));
280
296
plaintext_length = -1;
281
if (debug){
297
if(debug){
282
298
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if (result == NULL){
299
result = gpgme_op_decrypt_result(mc.ctx);
300
if(result == NULL){
285
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
302
} else {
287
303
fprintf(stderr, "Unsupported algorithm: %s\n",
293
309
}
294
310
gpgme_recipient_t recipient;
295
311
recipient = result->recipients;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
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;
306
320
}
307
321
}
308
322
}
314
328
}
315
329
316
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
318
332
perror("gpgme_data_seek");
319
333
plaintext_length = -1;
320
334
goto decrypt_end;
322
336
323
337
*plaintext = NULL;
324
338
while(true){
325
plaintext_capacity = adjustbuffer(plaintext,
339
plaintext_capacity = incbuffer(plaintext,
326
340
(size_t)plaintext_length,
327
341
plaintext_capacity);
328
if (plaintext_capacity == 0){
329
perror("adjustbuffer");
342
if(plaintext_capacity == 0){
343
perror("incbuffer");
330
344
plaintext_length = -1;
331
345
goto decrypt_end;
332
346
}
334
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
335
349
BUFFER_SIZE);
336
350
/* Print the data, if any */
337
if (ret == 0){
351
if(ret == 0){
338
352
/* EOF */
339
353
break;
340
354
}
364
378
return plaintext_length;
365
379
}
366
380
367
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
369
if (ret == NULL)
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
384
if(ret == NULL)
370
385
ret = "(unknown)";
371
386
return ret;
372
387
}
377
392
fprintf(stderr, "GnuTLS: %s", string);
378
393
}
379
394
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
395
static int init_gnutls_global(const char *pubkeyfilename,
382
396
const char *seckeyfilename){
383
397
int ret;
384
398
387
401
}
388
402
389
403
ret = gnutls_global_init();
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
393
407
return -1;
394
408
}
395
409
396
if (debug){
410
if(debug){
397
411
/* "Use a log level over 10 to enable all debugging options."
398
412
* - GnuTLS manual
399
413
*/
402
416
}
403
417
404
418
/* OpenPGP credentials */
405
gnutls_certificate_allocate_credentials(&mc->cred);
406
if (ret != GNUTLS_E_SUCCESS){
407
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
408
warning */
409
safer_gnutls_strerror(ret));
410
gnutls_global_deinit ();
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();
411
427
return -1;
412
428
}
413
429
418
434
}
419
435
420
436
ret = gnutls_certificate_set_openpgp_key_file
421
(mc->cred, pubkeyfilename, seckeyfilename,
437
(mc.cred, pubkeyfilename, seckeyfilename,
422
438
GNUTLS_OPENPGP_FMT_BASE64);
423
if (ret != GNUTLS_E_SUCCESS) {
439
if(ret != GNUTLS_E_SUCCESS){
424
440
fprintf(stderr,
425
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
430
446
}
431
447
432
448
/* GnuTLS server initialization */
433
ret = gnutls_dh_params_init(&mc->dh_params);
434
if (ret != GNUTLS_E_SUCCESS) {
435
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
436
" %s\n", safer_gnutls_strerror(ret));
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));
437
453
goto globalfail;
438
454
}
439
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
440
if (ret != GNUTLS_E_SUCCESS) {
441
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
442
safer_gnutls_strerror(ret));
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));
443
459
goto globalfail;
444
460
}
445
461
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
447
463
448
464
return 0;
449
465
450
466
globalfail:
451
467
452
gnutls_certificate_free_credentials(mc->cred);
468
gnutls_certificate_free_credentials(mc.cred);
453
469
gnutls_global_deinit();
454
gnutls_dh_params_deinit(mc->dh_params);
470
gnutls_dh_params_deinit(mc.dh_params);
455
471
return -1;
456
472
}
457
473
458
static int init_gnutls_session(mandos_context *mc,
459
gnutls_session_t *session){
474
static int init_gnutls_session(gnutls_session_t *session){
460
475
int ret;
461
476
/* GnuTLS session creation */
462
477
ret = gnutls_init(session, GNUTLS_SERVER);
463
if (ret != GNUTLS_E_SUCCESS){
478
if(ret != GNUTLS_E_SUCCESS){
464
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
465
480
safer_gnutls_strerror(ret));
466
481
}
467
482
468
483
{
469
484
const char *err;
470
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
471
if (ret != GNUTLS_E_SUCCESS) {
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
486
if(ret != GNUTLS_E_SUCCESS){
472
487
fprintf(stderr, "Syntax error at: %s\n", err);
473
488
fprintf(stderr, "GnuTLS error: %s\n",
474
489
safer_gnutls_strerror(ret));
475
gnutls_deinit (*session);
490
gnutls_deinit(*session);
476
491
return -1;
477
492
}
478
493
}
479
494
480
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
481
mc->cred);
482
if (ret != GNUTLS_E_SUCCESS) {
496
mc.cred);
497
if(ret != GNUTLS_E_SUCCESS){
483
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
484
499
safer_gnutls_strerror(ret));
485
gnutls_deinit (*session);
500
gnutls_deinit(*session);
486
501
return -1;
487
502
}
488
503
489
504
/* ignore client certificate if any. */
490
gnutls_certificate_server_set_request (*session,
491
GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
492
507
493
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
494
509
495
510
return 0;
496
511
}
499
514
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
500
515
__attribute__((unused)) const char *txt){}
501
516
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
502
520
/* Called when a Mandos server is found */
503
521
static int start_mandos_communication(const char *ip, uint16_t port,
504
522
AvahiIfIndex if_index,
505
mandos_context *mc){
506
int ret, tcp_sd;
507
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
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;
508
530
char *buffer = NULL;
509
531
char *decrypted_buffer;
510
532
size_t buffer_length = 0;
512
534
ssize_t decrypted_buffer_size;
513
535
size_t written;
514
536
int retval = 0;
515
char interface[IF_NAMESIZE];
516
537
gnutls_session_t session;
517
518
ret = init_gnutls_session (mc, &session);
519
if (ret != 0){
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){
520
558
return -1;
521
559
}
522
560
523
561
if(debug){
524
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
562
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
525
563
"\n", ip, port);
526
564
}
527
565
528
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
529
if(tcp_sd < 0) {
566
tcp_sd = socket(pf, SOCK_STREAM, 0);
567
if(tcp_sd < 0){
530
568
perror("socket");
531
return -1;
569
retval = -1;
570
goto mandos_end;
532
571
}
533
572
534
if(debug){
535
if(if_indextoname((unsigned int)if_index, interface) == NULL){
536
perror("if_indextoname");
537
return -1;
538
}
539
fprintf(stderr, "Binding to interface %s\n", interface);
573
if(quit_now){
574
goto mandos_end;
540
575
}
541
576
542
577
memset(&to, 0, sizeof(to));
543
to.in6.sin6_family = AF_INET6;
544
/* It would be nice to have a way to detect if we were passed an
545
IPv4 address here. Now we assume an IPv6 address. */
546
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
547
if (ret < 0 ){
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 ){
548
586
perror("inet_pton");
549
return -1;
587
retval = -1;
588
goto mandos_end;
550
589
}
551
590
if(ret == 0){
552
591
fprintf(stderr, "Bad address: %s\n", ip);
553
return -1;
554
}
555
to.in6.sin6_port = htons(port); /* Spurious warning */
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
}
556
617
557
to.in6.sin6_scope_id = (uint32_t)if_index;
618
if(quit_now){
619
goto mandos_end;
620
}
558
621
559
622
if(debug){
560
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
561
port);
562
char addrstr[INET6_ADDRSTRLEN] = "";
563
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
564
sizeof(addrstr)) == NULL){
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){
565
646
perror("inet_ntop");
566
647
} else {
567
648
if(strcmp(addrstr, ip) != 0){
570
651
}
571
652
}
572
653
573
ret = connect(tcp_sd, &to.in, sizeof(to));
574
if (ret < 0){
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){
575
664
perror("connect");
576
return -1;
665
retval = -1;
666
goto mandos_end;
667
}
668
669
if(quit_now){
670
goto mandos_end;
577
671
}
578
672
579
673
const char *out = mandos_protocol_version;
580
674
written = 0;
581
while (true){
675
while(true){
582
676
size_t out_size = strlen(out);
583
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
677
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
584
678
out_size - written));
585
if (ret == -1){
679
if(ret == -1){
586
680
perror("write");
587
681
retval = -1;
588
682
goto mandos_end;
591
685
if(written < out_size){
592
686
continue;
593
687
} else {
594
if (out == mandos_protocol_version){
688
if(out == mandos_protocol_version){
595
689
written = 0;
596
690
out = "\r\n";
597
691
} else {
598
692
break;
599
693
}
600
694
}
695
696
if(quit_now){
697
goto mandos_end;
698
}
601
699
}
602
700
603
701
if(debug){
604
702
fprintf(stderr, "Establishing TLS session with %s\n", ip);
605
703
}
606
704
607
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
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
}
608
714
609
715
do{
610
ret = gnutls_handshake (session);
716
ret = gnutls_handshake(session);
717
if(quit_now){
718
goto mandos_end;
719
}
611
720
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
612
721
613
if (ret != GNUTLS_E_SUCCESS){
722
if(ret != GNUTLS_E_SUCCESS){
614
723
if(debug){
615
724
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
616
gnutls_perror (ret);
725
gnutls_perror(ret);
617
726
}
618
727
retval = -1;
619
728
goto mandos_end;
622
731
/* Read OpenPGP packet that contains the wanted password */
623
732
624
733
if(debug){
625
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
734
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
626
735
ip);
627
736
}
628
737
629
738
while(true){
630
buffer_capacity = adjustbuffer(&buffer, buffer_length,
739
740
if(quit_now){
741
goto mandos_end;
742
}
743
744
buffer_capacity = incbuffer(&buffer, buffer_length,
631
745
buffer_capacity);
632
if (buffer_capacity == 0){
633
perror("adjustbuffer");
746
if(buffer_capacity == 0){
747
perror("incbuffer");
634
748
retval = -1;
635
749
goto mandos_end;
636
750
}
637
751
638
ret = gnutls_record_recv(session, buffer+buffer_length,
639
BUFFER_SIZE);
640
if (ret == 0){
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){
641
759
break;
642
760
}
643
if (ret < 0){
644
switch(ret){
761
if(sret < 0){
762
switch(sret){
645
763
case GNUTLS_E_INTERRUPTED:
646
764
case GNUTLS_E_AGAIN:
647
765
break;
648
766
case GNUTLS_E_REHANDSHAKE:
649
767
do{
650
ret = gnutls_handshake (session);
768
ret = gnutls_handshake(session);
769
770
if(quit_now){
771
goto mandos_end;
772
}
651
773
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
652
if (ret < 0){
774
if(ret < 0){
653
775
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
654
gnutls_perror (ret);
776
gnutls_perror(ret);
655
777
retval = -1;
656
778
goto mandos_end;
657
779
}
660
782
fprintf(stderr, "Unknown error while reading data from"
661
783
" encrypted session with Mandos server\n");
662
784
retval = -1;
663
gnutls_bye (session, GNUTLS_SHUT_RDWR);
785
gnutls_bye(session, GNUTLS_SHUT_RDWR);
664
786
goto mandos_end;
665
787
}
666
788
} else {
667
buffer_length += (size_t) ret;
789
buffer_length += (size_t) sret;
668
790
}
669
791
}
670
792
672
794
fprintf(stderr, "Closing TLS session\n");
673
795
}
674
796
675
gnutls_bye (session, GNUTLS_SHUT_RDWR);
676
677
if (buffer_length > 0){
678
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
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,
679
809
buffer_length,
680
810
&decrypted_buffer);
681
if (decrypted_buffer_size >= 0){
811
if(decrypted_buffer_size >= 0){
682
812
written = 0;
683
813
while(written < (size_t) decrypted_buffer_size){
684
ret = (int)fwrite (decrypted_buffer + written, 1,
685
(size_t)decrypted_buffer_size - written,
686
stdout);
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);
687
821
if(ret == 0 and ferror(stdout)){
688
822
if(debug){
689
823
fprintf(stderr, "Error writing encrypted data: %s\n",
706
840
707
841
mandos_end:
708
842
free(buffer);
709
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
843
if(tcp_sd >= 0){
844
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
845
}
710
846
if(ret == -1){
711
847
perror("close");
712
848
}
713
gnutls_deinit (session);
849
gnutls_deinit(session);
850
if(quit_now){
851
retval = -1;
852
}
714
853
return retval;
715
854
}
716
855
717
856
static void resolve_callback(AvahiSServiceResolver *r,
718
857
AvahiIfIndex interface,
719
AVAHI_GCC_UNUSED AvahiProtocol protocol,
858
AvahiProtocol proto,
720
859
AvahiResolverEvent event,
721
860
const char *name,
722
861
const char *type,
727
866
AVAHI_GCC_UNUSED AvahiStringList *txt,
728
867
AVAHI_GCC_UNUSED AvahiLookupResultFlags
729
868
flags,
730
void* userdata) {
731
mandos_context *mc = userdata;
869
AVAHI_GCC_UNUSED void* userdata){
732
870
assert(r);
733
871
734
872
/* Called whenever a service has been resolved successfully or
735
873
timed out */
736
874
737
switch (event) {
875
if(quit_now){
876
return;
877
}
878
879
switch(event){
738
880
default:
739
881
case AVAHI_RESOLVER_FAILURE:
740
882
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
741
883
" of type '%s' in domain '%s': %s\n", name, type, domain,
742
avahi_strerror(avahi_server_errno(mc->server)));
884
avahi_strerror(avahi_server_errno(mc.server)));
743
885
break;
744
886
745
887
case AVAHI_RESOLVER_FOUND:
748
890
avahi_address_snprint(ip, sizeof(ip), address);
749
891
if(debug){
750
892
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
751
PRIu16 ") on port %d\n", name, host_name, ip,
752
interface, port);
893
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
894
ip, (intmax_t)interface, port);
753
895
}
754
int ret = start_mandos_communication(ip, port, interface, mc);
755
if (ret == 0){
756
avahi_simple_poll_quit(mc->simple_poll);
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);
757
900
}
758
901
}
759
902
}
760
903
avahi_s_service_resolver_free(r);
761
904
}
762
905
763
static void browse_callback( AvahiSServiceBrowser *b,
764
AvahiIfIndex interface,
765
AvahiProtocol protocol,
766
AvahiBrowserEvent event,
767
const char *name,
768
const char *type,
769
const char *domain,
770
AVAHI_GCC_UNUSED AvahiLookupResultFlags
771
flags,
772
void* userdata) {
773
mandos_context *mc = userdata;
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){
774
916
assert(b);
775
917
776
918
/* Called whenever a new services becomes available on the LAN or
777
919
is removed from the LAN */
778
920
779
switch (event) {
921
if(quit_now){
922
return;
923
}
924
925
switch(event){
780
926
default:
781
927
case AVAHI_BROWSER_FAILURE:
782
928
783
929
fprintf(stderr, "(Avahi browser) %s\n",
784
avahi_strerror(avahi_server_errno(mc->server)));
785
avahi_simple_poll_quit(mc->simple_poll);
930
avahi_strerror(avahi_server_errno(mc.server)));
931
avahi_simple_poll_quit(mc.simple_poll);
786
932
return;
787
933
788
934
case AVAHI_BROWSER_NEW:
791
937
the callback function is called the Avahi server will free the
792
938
resolver for us. */
793
939
794
if (!(avahi_s_service_resolver_new(mc->server, interface,
795
protocol, name, type, domain,
796
AVAHI_PROTO_INET6, 0,
797
resolve_callback, mc)))
940
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
941
name, type, domain, protocol, 0,
942
resolve_callback, NULL) == NULL)
798
943
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
799
name, avahi_strerror(avahi_server_errno(mc->server)));
944
name, avahi_strerror(avahi_server_errno(mc.server)));
800
945
break;
801
946
802
947
case AVAHI_BROWSER_REMOVE:
811
956
}
812
957
}
813
958
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
814
973
int main(int argc, char *argv[]){
815
AvahiSServiceBrowser *sb = NULL;
816
int error;
817
int ret;
818
int exitcode = EXIT_SUCCESS;
819
const char *interface = "eth0";
820
struct ifreq network;
821
int sd;
822
uid_t uid;
823
gid_t gid;
824
char *connect_to = NULL;
825
char tempdir[] = "/tmp/mandosXXXXXX";
826
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
827
const char *seckey = PATHDIR "/" SECKEY;
828
const char *pubkey = PATHDIR "/" PUBKEY;
829
830
mandos_context mc = { .simple_poll = NULL, .server = NULL,
831
.dh_bits = 1024, .priority = "SECURE256"
832
":!CTYPE-X.509:+CTYPE-OPENPGP" };
833
bool gnutls_initalized = false;
834
bool gpgme_initalized = false;
835
836
{
837
struct argp_option options[] = {
838
{ .name = "debug", .key = 128,
839
.doc = "Debug mode", .group = 3 },
840
{ .name = "connect", .key = 'c',
841
.arg = "ADDRESS:PORT",
842
.doc = "Connect directly to a specific Mandos server",
843
.group = 1 },
844
{ .name = "interface", .key = 'i',
845
.arg = "NAME",
846
.doc = "Interface that will be used to search for Mandos"
847
" servers",
848
.group = 1 },
849
{ .name = "seckey", .key = 's',
850
.arg = "FILE",
851
.doc = "OpenPGP secret key file base name",
852
.group = 1 },
853
{ .name = "pubkey", .key = 'p',
854
.arg = "FILE",
855
.doc = "OpenPGP public key file base name",
856
.group = 2 },
857
{ .name = "dh-bits", .key = 129,
858
.arg = "BITS",
859
.doc = "Bit length of the prime number used in the"
860
" Diffie-Hellman key exchange",
861
.group = 2 },
862
{ .name = "priority", .key = 130,
863
.arg = "STRING",
864
.doc = "GnuTLS priority string for the TLS handshake",
865
.group = 1 },
866
{ .name = NULL }
867
};
868
869
error_t parse_opt (int key, char *arg,
870
struct argp_state *state) {
871
/* Get the INPUT argument from `argp_parse', which we know is
872
a pointer to our plugin list pointer. */
873
switch (key) {
874
case 128: /* --debug */
875
debug = true;
876
break;
877
case 'c': /* --connect */
878
connect_to = arg;
879
break;
880
case 'i': /* --interface */
881
interface = arg;
882
break;
883
case 's': /* --seckey */
884
seckey = arg;
885
break;
886
case 'p': /* --pubkey */
887
pubkey = arg;
888
break;
889
case 129: /* --dh-bits */
890
errno = 0;
891
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
892
if (errno){
893
perror("strtol");
894
exit(EXIT_FAILURE);
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'){
1178
if_index = (AvahiIfIndex) if_nametoindex(interface);
1179
if(if_index == 0){
1180
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");
895
1242
}
896
break;
897
case 130: /* --priority */
898
mc.priority = arg;
899
break;
900
case ARGP_KEY_ARG:
901
argp_usage (state);
902
case ARGP_KEY_END:
903
break;
904
default:
905
return ARGP_ERR_UNKNOWN;
906
1243
}
907
return 0;
908
}
909
910
struct argp argp = { .options = options, .parser = parse_opt,
911
.args_doc = "",
912
.doc = "Mandos client -- Get and decrypt"
913
" passwords from a Mandos server" };
914
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
915
if (ret == ARGP_ERR_UNKNOWN){
916
fprintf(stderr, "Unknown error while parsing arguments\n");
917
exitcode = EXIT_FAILURE;
1244
#endif /* __linux__ */
918
1245
goto end;
919
1246
}
920
1247
}
921
922
/* If the interface is down, bring it up */
923
{
924
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
925
if(sd < 0) {
926
perror("socket");
927
exitcode = EXIT_FAILURE;
928
goto end;
929
}
930
strcpy(network.ifr_name, interface);
1248
/* sleep checking until interface is running */
1249
for(int i=0; i < delay * 4; i++){
931
1250
ret = ioctl(sd, SIOCGIFFLAGS, &network);
932
1251
if(ret == -1){
933
1252
perror("ioctl SIOCGIFFLAGS");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
if((network.ifr_flags & IFF_UP) == 0){
938
network.ifr_flags |= IFF_UP;
939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
940
if(ret == -1){
941
perror("ioctl SIOCSIFFLAGS");
942
exitcode = EXIT_FAILURE;
943
goto end;
944
}
945
}
946
ret = TEMP_FAILURE_RETRY(close(sd));
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));
947
1265
if(ret == -1){
948
1266
perror("close");
949
1267
}
950
1268
}
951
952
uid = getuid();
953
gid = getgid();
954
955
ret = setuid(uid);
956
if (ret == -1){
957
perror("setuid");
958
}
959
960
setgid(gid);
961
if (ret == -1){
962
perror("setgid");
963
}
964
965
ret = init_gnutls_global(&mc, pubkey, seckey);
966
if (ret == -1){
967
fprintf(stderr, "init_gnutls_global failed\n");
968
exitcode = EXIT_FAILURE;
969
goto end;
970
} else {
971
gnutls_initalized = true;
972
}
973
974
if(mkdtemp(tempdir) == NULL){
975
perror("mkdtemp");
976
tempdir[0] = '\0';
977
goto end;
978
}
979
980
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
981
fprintf(stderr, "gpgme_initalized failed\n");
982
exitcode = EXIT_FAILURE;
983
goto end;
984
} else {
985
gpgme_initalized = true;
986
}
987
988
if_index = (AvahiIfIndex) if_nametoindex(interface);
989
if(if_index == 0){
990
fprintf(stderr, "No such interface: \"%s\"\n", interface);
991
exit(EXIT_FAILURE);
992
}
993
994
if(connect_to != NULL){
995
/* Connect directly, do not use Zeroconf */
996
/* (Mainly meant for debugging) */
997
char *address = strrchr(connect_to, ':');
998
if(address == NULL){
999
fprintf(stderr, "No colon in address\n");
1000
exitcode = EXIT_FAILURE;
1001
goto end;
1002
}
1003
errno = 0;
1004
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1005
if(errno){
1006
perror("Bad port number");
1007
exitcode = EXIT_FAILURE;
1008
goto end;
1009
}
1010
*address = '\0';
1011
address = connect_to;
1012
ret = start_mandos_communication(address, port, if_index, &mc);
1013
if(ret < 0){
1014
exitcode = EXIT_FAILURE;
1015
} else {
1016
exitcode = EXIT_SUCCESS;
1017
}
1018
goto end;
1019
}
1020
1021
if (not debug){
1022
avahi_set_log_function(empty_log);
1023
}
1024
1025
/* Initialize the pseudo-RNG for Avahi */
1026
srand((unsigned int) time(NULL));
1027
1028
/* Allocate main Avahi loop object */
1029
mc.simple_poll = avahi_simple_poll_new();
1030
if (mc.simple_poll == NULL) {
1031
fprintf(stderr, "Avahi: Failed to create simple poll"
1032
" object.\n");
1033
exitcode = EXIT_FAILURE;
1034
goto end;
1035
}
1036
1037
{
1038
AvahiServerConfig config;
1039
/* Do not publish any local Zeroconf records */
1040
avahi_server_config_init(&config);
1041
config.publish_hinfo = 0;
1042
config.publish_addresses = 0;
1043
config.publish_workstation = 0;
1044
config.publish_domain = 0;
1045
1046
/* Allocate a new server */
1047
mc.server = avahi_server_new(avahi_simple_poll_get
1048
(mc.simple_poll), &config, NULL,
1049
NULL, &error);
1050
1051
/* Free the Avahi configuration data */
1052
avahi_server_config_free(&config);
1053
}
1054
1055
/* Check if creating the Avahi server object succeeded */
1056
if (mc.server == NULL) {
1057
fprintf(stderr, "Failed to create Avahi server: %s\n",
1058
avahi_strerror(error));
1059
exitcode = EXIT_FAILURE;
1060
goto end;
1061
}
1062
1063
/* Create the Avahi service browser */
1064
sb = avahi_s_service_browser_new(mc.server, if_index,
1065
AVAHI_PROTO_INET6,
1066
"_mandos._tcp", NULL, 0,
1067
browse_callback, &mc);
1068
if (sb == NULL) {
1069
fprintf(stderr, "Failed to create service browser: %s\n",
1070
avahi_strerror(avahi_server_errno(mc.server)));
1071
exitcode = EXIT_FAILURE;
1072
goto end;
1073
}
1074
1075
/* Run the main loop */
1076
1077
if (debug){
1078
fprintf(stderr, "Starting Avahi loop search\n");
1079
}
1080
1081
avahi_simple_poll_loop(mc.simple_poll);
1082
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
1083
1447
end:
1084
1085
if (debug){
1086
fprintf(stderr, "%s exiting\n", argv[0]);
1087
}
1088
1089
/* Cleanup things */
1090
if (sb != NULL)
1091
avahi_s_service_browser_free(sb);
1092
1093
if (mc.server != NULL)
1094
avahi_server_free(mc.server);
1095
1096
if (mc.simple_poll != NULL)
1097
avahi_simple_poll_free(mc.simple_poll);
1098
1099
if (gnutls_initalized){
1100
gnutls_certificate_free_credentials(mc.cred);
1101
gnutls_global_deinit ();
1102
gnutls_dh_params_deinit(mc.dh_params);
1103
}
1104
1105
if(gpgme_initalized){
1106
gpgme_release(mc.ctx);
1107
}
1108
1109
/* Removes the temp directory used by GPGME */
1110
if(tempdir[0] != '\0'){
1111
DIR *d;
1112
struct dirent *direntry;
1113
d = opendir(tempdir);
1114
if(d == NULL){
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){
1115
1498
perror("opendir");
1116
} else {
1117
while(true){
1118
direntry = readdir(d);
1119
if(direntry == NULL){
1120
break;
1121
}
1122
if (direntry->d_type == DT_REG){
1123
char *fullname = NULL;
1124
ret = asprintf(&fullname, "%s/%s", tempdir,
1125
direntry->d_name);
1126
if(ret < 0){
1127
perror("asprintf");
1128
continue;
1129
}
1130
ret = unlink(fullname);
1131
if(ret == -1){
1132
fprintf(stderr, "unlink(\"%s\"): %s",
1133
fullname, strerror(errno));
1134
}
1135
free(fullname);
1136
}
1137
}
1138
closedir(d);
1139
}
1140
ret = rmdir(tempdir);
1141
if(ret == -1){
1142
perror("rmdir");
1143
}
1144
}
1145
1146
return exitcode;
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;
1147
1546
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0