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- Committer: Teddy Hogeborn
- Date: 2008-10-03 09:32:30 UTC
- Revision ID: teddy@fukt.bsnet.se-20081003093230-rshn19e0c19zz12i
* .bzrignore (plugins.d/askpass-fifo): Added.
* Makefile (FORTIFY): Added "-fstack-protector-all".
(mandos, mandos-keygen): Use more strict regexps when updating the
version number.
* mandos (Client.__init__): Use os.path.expandvars() and
os.path.expanduser() on the "secfile"
config value.
* plugins.d/splashy.c: Update comments and order of #include's.
(main): Check user and group when looking for running splashy
process. Do not ignore ENOENT from execl(). Use _exit()
instead of "return" when an error happens in child
processes. Bug fix: Only wait for splashy_update
completion if it was started. Bug fix: detect failing
waitpid(). Only kill splashy_update if it is running. Do
the killing of the old splashy process before the fork().
Do setsid() and setuid(geteuid()) before starting the new
splashy. Report failing execl().
* plugins.d/usplash.c: Update comments and order of #include's.
(main): Check user and group when looking for running usplash
process. Do not report execv() error if interrupted by a
signal.
* Makefile (FORTIFY): Added "-fstack-protector-all".
(mandos, mandos-keygen): Use more strict regexps when updating the
version number.
* mandos (Client.__init__): Use os.path.expandvars() and
os.path.expanduser() on the "secfile"
config value.
* plugins.d/splashy.c: Update comments and order of #include's.
(main): Check user and group when looking for running splashy
process. Do not ignore ENOENT from execl(). Use _exit()
instead of "return" when an error happens in child
processes. Bug fix: Only wait for splashy_update
completion if it was started. Bug fix: detect failing
waitpid(). Only kill splashy_update if it is running. Do
the killing of the old splashy process before the fork().
Do setsid() and setuid(geteuid()) before starting the new
splashy. Report failing execl().
* plugins.d/usplash.c: Update comments and order of #include's.
(main): Check user and group when looking for running usplash
process. Do not report execv() error if interrupted by a
signal.
- files added:
- debian/mandos-client.config
- files removed:
- NEWS
- files modified:
- INSTALL
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif
39
34
40
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
36
42
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
38
stdout, ferror() */
44
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#include <stddef.h> /* NULL, size_t, ssize_t */
46
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
#include <stdbool.h> /* bool, false, true */
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
45
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
46
#include <sys/ioctl.h> /* ioctl */
52
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
48
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
56
51
#include <sys/stat.h> /* open() */
57
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
53
struct in6_addr, inet_pton(),
54
connect() */
59
55
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
64
58
#include <assert.h> /* assert() */
65
59
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
60
#include <time.h> /* time() */
67
61
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
62
SIOCSIFFLAGS, if_indextoname(),
69
63
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
64
#include <netinet/in.h>
73
65
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
66
getuid(), getgid(), setuid(),
75
67
setgid() */
76
68
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
69
#include <iso646.h> /* not, and */
78
70
#include <argp.h> /* struct argp_option, error_t, struct
79
71
argp_state, struct argp,
80
72
argp_parse(), ARGP_KEY_ARG,
81
73
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
85
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
89
74
90
75
/* Avahi */
91
76
/* All Avahi types, constants and functions
104
89
gnutls_*
105
90
init_gnutls_session(),
106
91
GNUTLS_* */
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
109
93
GNUTLS_OPENPGP_FMT_BASE64 */
110
94
111
95
/* GPGME */
137
121
gpgme_ctx_t ctx;
138
122
} mandos_context;
139
123
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
144
145
124
/*
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
125
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
126
* "buffer_capacity" is how much is currently allocated,
148
127
* "buffer_length" is how much is already used.
149
128
*/
150
size_t incbuffer(char **buffer, size_t buffer_length,
129
size_t adjustbuffer(char **buffer, size_t buffer_length,
151
130
size_t buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
131
if (buffer_length + BUFFER_SIZE > buffer_capacity){
153
132
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
133
if (buffer == NULL){
155
134
return 0;
156
135
}
157
136
buffer_capacity += BUFFER_SIZE;
162
141
/*
163
142
* Initialize GPGME.
164
143
*/
165
static bool init_gpgme(const char *seckey,
144
static bool init_gpgme(mandos_context *mc, const char *seckey,
166
145
const char *pubkey, const char *tempdir){
167
146
int ret;
168
147
gpgme_error_t rc;
170
149
171
150
172
151
/*
173
* Helper function to insert pub and seckey to the engine keyring.
152
* Helper function to insert pub and seckey to the enigne keyring.
174
153
*/
175
154
bool import_key(const char *filename){
176
155
int fd;
177
156
gpgme_data_t pgp_data;
178
157
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
158
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
159
if(fd == -1){
181
160
perror("open");
182
161
return false;
183
162
}
184
163
185
164
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
if(rc != GPG_ERR_NO_ERROR){
165
if (rc != GPG_ERR_NO_ERROR){
187
166
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
167
gpgme_strsource(rc), gpgme_strerror(rc));
189
168
return false;
190
169
}
191
170
192
rc = gpgme_op_import(mc.ctx, pgp_data);
193
if(rc != GPG_ERR_NO_ERROR){
171
rc = gpgme_op_import(mc->ctx, pgp_data);
172
if (rc != GPG_ERR_NO_ERROR){
194
173
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
174
gpgme_strsource(rc), gpgme_strerror(rc));
196
175
return false;
197
176
}
198
177
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
178
ret = TEMP_FAILURE_RETRY(close(fd));
200
179
if(ret == -1){
201
180
perror("close");
202
181
}
204
183
return true;
205
184
}
206
185
207
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
186
if (debug){
187
fprintf(stderr, "Initialize gpgme\n");
209
188
}
210
189
211
190
/* Init GPGME */
212
191
gpgme_check_version(NULL);
213
192
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
if(rc != GPG_ERR_NO_ERROR){
193
if (rc != GPG_ERR_NO_ERROR){
215
194
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
195
gpgme_strsource(rc), gpgme_strerror(rc));
217
196
return false;
218
197
}
219
198
220
199
/* Set GPGME home directory for the OpenPGP engine only */
221
rc = gpgme_get_engine_info(&engine_info);
222
if(rc != GPG_ERR_NO_ERROR){
200
rc = gpgme_get_engine_info (&engine_info);
201
if (rc != GPG_ERR_NO_ERROR){
223
202
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
203
gpgme_strsource(rc), gpgme_strerror(rc));
225
204
return false;
238
217
}
239
218
240
219
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
242
if(rc != GPG_ERR_NO_ERROR){
220
rc = gpgme_new(&(mc->ctx));
221
if (rc != GPG_ERR_NO_ERROR){
243
222
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
223
gpgme_strsource(rc), gpgme_strerror(rc));
245
224
return false;
246
225
}
247
226
248
if(not import_key(pubkey) or not import_key(seckey)){
227
if (not import_key(pubkey) or not import_key(seckey)){
249
228
return false;
250
229
}
251
230
256
235
* Decrypt OpenPGP data.
257
236
* Returns -1 on error
258
237
*/
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
size_t crypto_size,
261
char **plaintext){
238
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
239
const char *cryptotext,
240
size_t crypto_size,
241
char **plaintext){
262
242
gpgme_data_t dh_crypto, dh_plain;
263
243
gpgme_error_t rc;
264
244
ssize_t ret;
265
245
size_t plaintext_capacity = 0;
266
246
ssize_t plaintext_length = 0;
267
247
268
if(debug){
248
if (debug){
269
249
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
270
250
}
271
251
272
252
/* Create new GPGME data buffer from memory cryptotext */
273
253
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
254
0);
275
if(rc != GPG_ERR_NO_ERROR){
255
if (rc != GPG_ERR_NO_ERROR){
276
256
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
257
gpgme_strsource(rc), gpgme_strerror(rc));
278
258
return -1;
280
260
281
261
/* Create new empty GPGME data buffer for the plaintext */
282
262
rc = gpgme_data_new(&dh_plain);
283
if(rc != GPG_ERR_NO_ERROR){
263
if (rc != GPG_ERR_NO_ERROR){
284
264
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
265
gpgme_strsource(rc), gpgme_strerror(rc));
286
266
gpgme_data_release(dh_crypto);
289
269
290
270
/* Decrypt data from the cryptotext data buffer to the plaintext
291
271
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
272
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
273
if (rc != GPG_ERR_NO_ERROR){
294
274
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
275
gpgme_strsource(rc), gpgme_strerror(rc));
296
276
plaintext_length = -1;
297
if(debug){
277
if (debug){
298
278
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
300
if(result == NULL){
279
result = gpgme_op_decrypt_result(mc->ctx);
280
if (result == NULL){
301
281
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
302
282
} else {
303
283
fprintf(stderr, "Unsupported algorithm: %s\n",
309
289
}
310
290
gpgme_recipient_t recipient;
311
291
recipient = result->recipients;
312
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
319
recipient = recipient->next;
292
if(recipient){
293
while(recipient != NULL){
294
fprintf(stderr, "Public key algorithm: %s\n",
295
gpgme_pubkey_algo_name(recipient->pubkey_algo));
296
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
297
fprintf(stderr, "Secret key available: %s\n",
298
recipient->status == GPG_ERR_NO_SECKEY
299
? "No" : "Yes");
300
recipient = recipient->next;
301
}
320
302
}
321
303
}
322
304
}
328
310
}
329
311
330
312
/* Seek back to the beginning of the GPGME plaintext data buffer */
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
313
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
332
314
perror("gpgme_data_seek");
333
315
plaintext_length = -1;
334
316
goto decrypt_end;
336
318
337
319
*plaintext = NULL;
338
320
while(true){
339
plaintext_capacity = incbuffer(plaintext,
321
plaintext_capacity = adjustbuffer(plaintext,
340
322
(size_t)plaintext_length,
341
323
plaintext_capacity);
342
if(plaintext_capacity == 0){
343
perror("incbuffer");
324
if (plaintext_capacity == 0){
325
perror("adjustbuffer");
344
326
plaintext_length = -1;
345
327
goto decrypt_end;
346
328
}
348
330
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
349
331
BUFFER_SIZE);
350
332
/* Print the data, if any */
351
if(ret == 0){
333
if (ret == 0){
352
334
/* EOF */
353
335
break;
354
336
}
378
360
return plaintext_length;
379
361
}
380
362
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
384
if(ret == NULL)
363
static const char * safer_gnutls_strerror (int value) {
364
const char *ret = gnutls_strerror (value); /* Spurious warning */
365
if (ret == NULL)
385
366
ret = "(unknown)";
386
367
return ret;
387
368
}
392
373
fprintf(stderr, "GnuTLS: %s", string);
393
374
}
394
375
395
static int init_gnutls_global(const char *pubkeyfilename,
376
static int init_gnutls_global(mandos_context *mc,
377
const char *pubkeyfilename,
396
378
const char *seckeyfilename){
397
379
int ret;
398
380
401
383
}
402
384
403
385
ret = gnutls_global_init();
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
386
if (ret != GNUTLS_E_SUCCESS) {
387
fprintf (stderr, "GnuTLS global_init: %s\n",
388
safer_gnutls_strerror(ret));
407
389
return -1;
408
390
}
409
391
410
if(debug){
392
if (debug){
411
393
/* "Use a log level over 10 to enable all debugging options."
412
394
* - GnuTLS manual
413
395
*/
416
398
}
417
399
418
400
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
420
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
426
gnutls_global_deinit();
401
gnutls_certificate_allocate_credentials(&mc->cred);
402
if (ret != GNUTLS_E_SUCCESS){
403
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
404
warning */
405
safer_gnutls_strerror(ret));
406
gnutls_global_deinit ();
427
407
return -1;
428
408
}
429
409
434
414
}
435
415
436
416
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
417
(mc->cred, pubkeyfilename, seckeyfilename,
438
418
GNUTLS_OPENPGP_FMT_BASE64);
439
if(ret != GNUTLS_E_SUCCESS){
419
if (ret != GNUTLS_E_SUCCESS) {
440
420
fprintf(stderr,
441
421
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
422
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
446
426
}
447
427
448
428
/* GnuTLS server initialization */
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
429
ret = gnutls_dh_params_init(&mc->dh_params);
430
if (ret != GNUTLS_E_SUCCESS) {
431
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
432
" %s\n", safer_gnutls_strerror(ret));
453
433
goto globalfail;
454
434
}
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
435
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
436
if (ret != GNUTLS_E_SUCCESS) {
437
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
438
safer_gnutls_strerror(ret));
459
439
goto globalfail;
460
440
}
461
441
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
442
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
463
443
464
444
return 0;
465
445
466
446
globalfail:
467
447
468
gnutls_certificate_free_credentials(mc.cred);
448
gnutls_certificate_free_credentials(mc->cred);
469
449
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
450
gnutls_dh_params_deinit(mc->dh_params);
471
451
return -1;
472
452
}
473
453
474
static int init_gnutls_session(gnutls_session_t *session){
454
static int init_gnutls_session(mandos_context *mc,
455
gnutls_session_t *session){
475
456
int ret;
476
457
/* GnuTLS session creation */
477
458
ret = gnutls_init(session, GNUTLS_SERVER);
478
if(ret != GNUTLS_E_SUCCESS){
459
if (ret != GNUTLS_E_SUCCESS){
479
460
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
461
safer_gnutls_strerror(ret));
481
462
}
482
463
483
464
{
484
465
const char *err;
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
486
if(ret != GNUTLS_E_SUCCESS){
466
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
467
if (ret != GNUTLS_E_SUCCESS) {
487
468
fprintf(stderr, "Syntax error at: %s\n", err);
488
469
fprintf(stderr, "GnuTLS error: %s\n",
489
470
safer_gnutls_strerror(ret));
490
gnutls_deinit(*session);
471
gnutls_deinit (*session);
491
472
return -1;
492
473
}
493
474
}
494
475
495
476
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
497
if(ret != GNUTLS_E_SUCCESS){
477
mc->cred);
478
if (ret != GNUTLS_E_SUCCESS) {
498
479
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
480
safer_gnutls_strerror(ret));
500
gnutls_deinit(*session);
481
gnutls_deinit (*session);
501
482
return -1;
502
483
}
503
484
504
485
/* ignore client certificate if any. */
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
486
gnutls_certificate_server_set_request (*session,
487
GNUTLS_CERT_IGNORE);
507
488
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
489
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
509
490
510
491
return 0;
511
492
}
517
498
/* Called when a Mandos server is found */
518
499
static int start_mandos_communication(const char *ip, uint16_t port,
519
500
AvahiIfIndex if_index,
520
int af){
501
mandos_context *mc){
521
502
int ret, tcp_sd;
522
ssize_t sret;
523
union {
524
struct sockaddr_in in;
525
struct sockaddr_in6 in6;
526
} to;
503
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
527
504
char *buffer = NULL;
528
505
char *decrypted_buffer;
529
506
size_t buffer_length = 0;
531
508
ssize_t decrypted_buffer_size;
532
509
size_t written;
533
510
int retval = 0;
511
char interface[IF_NAMESIZE];
534
512
gnutls_session_t session;
535
int pf; /* Protocol family */
536
537
switch(af){
538
case AF_INET6:
539
pf = PF_INET6;
540
break;
541
case AF_INET:
542
pf = PF_INET;
543
break;
544
default:
545
fprintf(stderr, "Bad address family: %d\n", af);
546
return -1;
547
}
548
549
ret = init_gnutls_session(&session);
550
if(ret != 0){
513
514
ret = init_gnutls_session (mc, &session);
515
if (ret != 0){
551
516
return -1;
552
517
}
553
518
554
519
if(debug){
555
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
520
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
556
521
"\n", ip, port);
557
522
}
558
523
559
tcp_sd = socket(pf, SOCK_STREAM, 0);
560
if(tcp_sd < 0){
524
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
525
if(tcp_sd < 0) {
561
526
perror("socket");
562
527
return -1;
563
528
}
564
529
530
if(debug){
531
if(if_indextoname((unsigned int)if_index, interface) == NULL){
532
perror("if_indextoname");
533
return -1;
534
}
535
fprintf(stderr, "Binding to interface %s\n", interface);
536
}
537
565
538
memset(&to, 0, sizeof(to));
566
if(af == AF_INET6){
567
to.in6.sin6_family = (sa_family_t)af;
568
ret = inet_pton(af, ip, &to.in6.sin6_addr);
569
} else { /* IPv4 */
570
to.in.sin_family = (sa_family_t)af;
571
ret = inet_pton(af, ip, &to.in.sin_addr);
572
}
573
if(ret < 0 ){
539
to.in6.sin6_family = AF_INET6;
540
/* It would be nice to have a way to detect if we were passed an
541
IPv4 address here. Now we assume an IPv6 address. */
542
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
543
if (ret < 0 ){
574
544
perror("inet_pton");
575
545
return -1;
576
546
}
578
548
fprintf(stderr, "Bad address: %s\n", ip);
579
549
return -1;
580
550
}
581
if(af == AF_INET6){
582
to.in6.sin6_port = htons(port); /* Spurious warnings from
583
-Wconversion and
584
-Wunreachable-code */
585
586
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
587
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
588
-Wunreachable-code*/
589
if(if_index == AVAHI_IF_UNSPEC){
590
fprintf(stderr, "An IPv6 link-local address is incomplete"
591
" without a network interface\n");
592
return -1;
593
}
594
/* Set the network interface number as scope */
595
to.in6.sin6_scope_id = (uint32_t)if_index;
596
}
597
} else {
598
to.in.sin_port = htons(port); /* Spurious warnings from
599
-Wconversion and
600
-Wunreachable-code */
601
}
551
to.in6.sin6_port = htons(port); /* Spurious warning */
552
553
to.in6.sin6_scope_id = (uint32_t)if_index;
602
554
603
555
if(debug){
604
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
605
char interface[IF_NAMESIZE];
606
if(if_indextoname((unsigned int)if_index, interface) == NULL){
607
perror("if_indextoname");
608
} else {
609
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
610
ip, interface, port);
611
}
612
} else {
613
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
614
port);
615
}
616
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
617
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
618
const char *pcret;
619
if(af == AF_INET6){
620
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
621
sizeof(addrstr));
622
} else {
623
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
624
sizeof(addrstr));
625
}
626
if(pcret == NULL){
556
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
557
port);
558
char addrstr[INET6_ADDRSTRLEN] = "";
559
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
560
sizeof(addrstr)) == NULL){
627
561
perror("inet_ntop");
628
562
} else {
629
563
if(strcmp(addrstr, ip) != 0){
632
566
}
633
567
}
634
568
635
if(af == AF_INET6){
636
ret = connect(tcp_sd, &to.in6, sizeof(to));
637
} else {
638
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
639
}
640
if(ret < 0){
569
ret = connect(tcp_sd, &to.in, sizeof(to));
570
if (ret < 0){
641
571
perror("connect");
642
572
return -1;
643
573
}
644
574
645
575
const char *out = mandos_protocol_version;
646
576
written = 0;
647
while(true){
577
while (true){
648
578
size_t out_size = strlen(out);
649
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
579
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
650
580
out_size - written));
651
if(ret == -1){
581
if (ret == -1){
652
582
perror("write");
653
583
retval = -1;
654
584
goto mandos_end;
657
587
if(written < out_size){
658
588
continue;
659
589
} else {
660
if(out == mandos_protocol_version){
590
if (out == mandos_protocol_version){
661
591
written = 0;
662
592
out = "\r\n";
663
593
} else {
670
600
fprintf(stderr, "Establishing TLS session with %s\n", ip);
671
601
}
672
602
673
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
603
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
674
604
675
605
do{
676
ret = gnutls_handshake(session);
606
ret = gnutls_handshake (session);
677
607
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
678
608
679
if(ret != GNUTLS_E_SUCCESS){
609
if (ret != GNUTLS_E_SUCCESS){
680
610
if(debug){
681
611
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
682
gnutls_perror(ret);
612
gnutls_perror (ret);
683
613
}
684
614
retval = -1;
685
615
goto mandos_end;
688
618
/* Read OpenPGP packet that contains the wanted password */
689
619
690
620
if(debug){
691
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
621
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
692
622
ip);
693
623
}
694
624
695
625
while(true){
696
buffer_capacity = incbuffer(&buffer, buffer_length,
626
buffer_capacity = adjustbuffer(&buffer, buffer_length,
697
627
buffer_capacity);
698
if(buffer_capacity == 0){
699
perror("incbuffer");
628
if (buffer_capacity == 0){
629
perror("adjustbuffer");
700
630
retval = -1;
701
631
goto mandos_end;
702
632
}
703
633
704
sret = gnutls_record_recv(session, buffer+buffer_length,
705
BUFFER_SIZE);
706
if(sret == 0){
634
ret = gnutls_record_recv(session, buffer+buffer_length,
635
BUFFER_SIZE);
636
if (ret == 0){
707
637
break;
708
638
}
709
if(sret < 0){
710
switch(sret){
639
if (ret < 0){
640
switch(ret){
711
641
case GNUTLS_E_INTERRUPTED:
712
642
case GNUTLS_E_AGAIN:
713
643
break;
714
644
case GNUTLS_E_REHANDSHAKE:
715
645
do{
716
ret = gnutls_handshake(session);
646
ret = gnutls_handshake (session);
717
647
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
718
if(ret < 0){
648
if (ret < 0){
719
649
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
720
gnutls_perror(ret);
650
gnutls_perror (ret);
721
651
retval = -1;
722
652
goto mandos_end;
723
653
}
726
656
fprintf(stderr, "Unknown error while reading data from"
727
657
" encrypted session with Mandos server\n");
728
658
retval = -1;
729
gnutls_bye(session, GNUTLS_SHUT_RDWR);
659
gnutls_bye (session, GNUTLS_SHUT_RDWR);
730
660
goto mandos_end;
731
661
}
732
662
} else {
733
buffer_length += (size_t) sret;
663
buffer_length += (size_t) ret;
734
664
}
735
665
}
736
666
738
668
fprintf(stderr, "Closing TLS session\n");
739
669
}
740
670
741
gnutls_bye(session, GNUTLS_SHUT_RDWR);
671
gnutls_bye (session, GNUTLS_SHUT_RDWR);
742
672
743
if(buffer_length > 0){
744
decrypted_buffer_size = pgp_packet_decrypt(buffer,
673
if (buffer_length > 0){
674
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
745
675
buffer_length,
746
676
&decrypted_buffer);
747
if(decrypted_buffer_size >= 0){
677
if (decrypted_buffer_size >= 0){
748
678
written = 0;
749
679
while(written < (size_t) decrypted_buffer_size){
750
ret = (int)fwrite(decrypted_buffer + written, 1,
751
(size_t)decrypted_buffer_size - written,
752
stdout);
680
ret = (int)fwrite (decrypted_buffer + written, 1,
681
(size_t)decrypted_buffer_size - written,
682
stdout);
753
683
if(ret == 0 and ferror(stdout)){
754
684
if(debug){
755
685
fprintf(stderr, "Error writing encrypted data: %s\n",
772
702
773
703
mandos_end:
774
704
free(buffer);
775
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
705
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
776
706
if(ret == -1){
777
707
perror("close");
778
708
}
779
gnutls_deinit(session);
709
gnutls_deinit (session);
780
710
return retval;
781
711
}
782
712
783
713
static void resolve_callback(AvahiSServiceResolver *r,
784
714
AvahiIfIndex interface,
785
AvahiProtocol proto,
715
AVAHI_GCC_UNUSED AvahiProtocol protocol,
786
716
AvahiResolverEvent event,
787
717
const char *name,
788
718
const char *type,
793
723
AVAHI_GCC_UNUSED AvahiStringList *txt,
794
724
AVAHI_GCC_UNUSED AvahiLookupResultFlags
795
725
flags,
796
AVAHI_GCC_UNUSED void* userdata){
726
void* userdata) {
727
mandos_context *mc = userdata;
797
728
assert(r);
798
729
799
730
/* Called whenever a service has been resolved successfully or
800
731
timed out */
801
732
802
switch(event){
733
switch (event) {
803
734
default:
804
735
case AVAHI_RESOLVER_FAILURE:
805
736
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
806
737
" of type '%s' in domain '%s': %s\n", name, type, domain,
807
avahi_strerror(avahi_server_errno(mc.server)));
738
avahi_strerror(avahi_server_errno(mc->server)));
808
739
break;
809
740
810
741
case AVAHI_RESOLVER_FOUND:
813
744
avahi_address_snprint(ip, sizeof(ip), address);
814
745
if(debug){
815
746
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
816
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
817
ip, (intmax_t)interface, port);
747
PRIu16 ") on port %d\n", name, host_name, ip,
748
interface, port);
818
749
}
819
int ret = start_mandos_communication(ip, port, interface,
820
avahi_proto_to_af(proto));
821
if(ret == 0){
822
avahi_simple_poll_quit(mc.simple_poll);
750
int ret = start_mandos_communication(ip, port, interface, mc);
751
if (ret == 0){
752
avahi_simple_poll_quit(mc->simple_poll);
823
753
}
824
754
}
825
755
}
826
756
avahi_s_service_resolver_free(r);
827
757
}
828
758
829
static void browse_callback(AvahiSServiceBrowser *b,
830
AvahiIfIndex interface,
831
AvahiProtocol protocol,
832
AvahiBrowserEvent event,
833
const char *name,
834
const char *type,
835
const char *domain,
836
AVAHI_GCC_UNUSED AvahiLookupResultFlags
837
flags,
838
AVAHI_GCC_UNUSED void* userdata){
759
static void browse_callback( AvahiSServiceBrowser *b,
760
AvahiIfIndex interface,
761
AvahiProtocol protocol,
762
AvahiBrowserEvent event,
763
const char *name,
764
const char *type,
765
const char *domain,
766
AVAHI_GCC_UNUSED AvahiLookupResultFlags
767
flags,
768
void* userdata) {
769
mandos_context *mc = userdata;
839
770
assert(b);
840
771
841
772
/* Called whenever a new services becomes available on the LAN or
842
773
is removed from the LAN */
843
774
844
switch(event){
775
switch (event) {
845
776
default:
846
777
case AVAHI_BROWSER_FAILURE:
847
778
848
779
fprintf(stderr, "(Avahi browser) %s\n",
849
avahi_strerror(avahi_server_errno(mc.server)));
850
avahi_simple_poll_quit(mc.simple_poll);
780
avahi_strerror(avahi_server_errno(mc->server)));
781
avahi_simple_poll_quit(mc->simple_poll);
851
782
return;
852
783
853
784
case AVAHI_BROWSER_NEW:
856
787
the callback function is called the Avahi server will free the
857
788
resolver for us. */
858
789
859
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
860
name, type, domain, protocol, 0,
861
resolve_callback, NULL) == NULL)
790
if (!(avahi_s_service_resolver_new(mc->server, interface,
791
protocol, name, type, domain,
792
AVAHI_PROTO_INET6, 0,
793
resolve_callback, mc)))
862
794
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
863
name, avahi_strerror(avahi_server_errno(mc.server)));
795
name, avahi_strerror(avahi_server_errno(mc->server)));
864
796
break;
865
797
866
798
case AVAHI_BROWSER_REMOVE:
875
807
}
876
808
}
877
809
878
sig_atomic_t quit_now = 0;
879
880
/* stop main loop after sigterm has been called */
881
static void handle_sigterm(__attribute__((unused)) int sig){
882
if(quit_now){
883
return;
884
}
885
quit_now = 1;
886
int old_errno = errno;
887
if(mc.simple_poll != NULL){
888
avahi_simple_poll_quit(mc.simple_poll);
889
}
890
errno = old_errno;
891
}
892
893
810
int main(int argc, char *argv[]){
894
AvahiSServiceBrowser *sb = NULL;
895
int error;
896
int ret;
897
intmax_t tmpmax;
898
char *tmp;
899
int exitcode = EXIT_SUCCESS;
900
const char *interface = "eth0";
901
struct ifreq network;
902
int sd = -1;
903
bool interface_taken_up = false;
904
uid_t uid;
905
gid_t gid;
906
char *connect_to = NULL;
907
char tempdir[] = "/tmp/mandosXXXXXX";
908
bool tempdir_created = false;
909
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
910
const char *seckey = PATHDIR "/" SECKEY;
911
const char *pubkey = PATHDIR "/" PUBKEY;
912
913
bool gnutls_initialized = false;
914
bool gpgme_initialized = false;
915
float delay = 2.5f;
916
917
struct sigaction old_sigterm_action;
918
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
919
920
{
921
struct argp_option options[] = {
922
{ .name = "debug", .key = 128,
923
.doc = "Debug mode", .group = 3 },
924
{ .name = "connect", .key = 'c',
925
.arg = "ADDRESS:PORT",
926
.doc = "Connect directly to a specific Mandos server",
927
.group = 1 },
928
{ .name = "interface", .key = 'i',
929
.arg = "NAME",
930
.doc = "Network interface that will be used to search for"
931
" Mandos servers",
932
.group = 1 },
933
{ .name = "seckey", .key = 's',
934
.arg = "FILE",
935
.doc = "OpenPGP secret key file base name",
936
.group = 1 },
937
{ .name = "pubkey", .key = 'p',
938
.arg = "FILE",
939
.doc = "OpenPGP public key file base name",
940
.group = 2 },
941
{ .name = "dh-bits", .key = 129,
942
.arg = "BITS",
943
.doc = "Bit length of the prime number used in the"
944
" Diffie-Hellman key exchange",
945
.group = 2 },
946
{ .name = "priority", .key = 130,
947
.arg = "STRING",
948
.doc = "GnuTLS priority string for the TLS handshake",
949
.group = 1 },
950
{ .name = "delay", .key = 131,
951
.arg = "SECONDS",
952
.doc = "Maximum delay to wait for interface startup",
953
.group = 2 },
954
{ .name = NULL }
955
};
956
957
error_t parse_opt(int key, char *arg,
958
struct argp_state *state){
959
switch(key){
960
case 128: /* --debug */
961
debug = true;
962
break;
963
case 'c': /* --connect */
964
connect_to = arg;
965
break;
966
case 'i': /* --interface */
967
interface = arg;
968
break;
969
case 's': /* --seckey */
970
seckey = arg;
971
break;
972
case 'p': /* --pubkey */
973
pubkey = arg;
974
break;
975
case 129: /* --dh-bits */
976
errno = 0;
977
tmpmax = strtoimax(arg, &tmp, 10);
978
if(errno != 0 or tmp == arg or *tmp != '\0'
979
or tmpmax != (typeof(mc.dh_bits))tmpmax){
980
fprintf(stderr, "Bad number of DH bits\n");
981
exit(EXIT_FAILURE);
982
}
983
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
984
break;
985
case 130: /* --priority */
986
mc.priority = arg;
987
break;
988
case 131: /* --delay */
989
errno = 0;
990
delay = strtof(arg, &tmp);
991
if(errno != 0 or tmp == arg or *tmp != '\0'){
992
fprintf(stderr, "Bad delay\n");
993
exit(EXIT_FAILURE);
994
}
995
break;
996
case ARGP_KEY_ARG:
997
argp_usage(state);
998
case ARGP_KEY_END:
999
break;
1000
default:
1001
return ARGP_ERR_UNKNOWN;
1002
}
1003
return 0;
1004
}
1005
1006
struct argp argp = { .options = options, .parser = parse_opt,
1007
.args_doc = "",
1008
.doc = "Mandos client -- Get and decrypt"
1009
" passwords from a Mandos server" };
1010
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1011
if(ret == ARGP_ERR_UNKNOWN){
1012
fprintf(stderr, "Unknown error while parsing arguments\n");
1013
exitcode = EXIT_FAILURE;
1014
goto end;
1015
}
1016
}
1017
1018
if(not debug){
1019
avahi_set_log_function(empty_log);
1020
}
1021
1022
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1023
from the signal handler */
1024
/* Initialize the pseudo-RNG for Avahi */
1025
srand((unsigned int) time(NULL));
1026
mc.simple_poll = avahi_simple_poll_new();
1027
if(mc.simple_poll == NULL){
1028
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1029
exitcode = EXIT_FAILURE;
1030
goto end;
1031
}
1032
1033
sigemptyset(&sigterm_action.sa_mask);
1034
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1035
if(ret == -1){
1036
perror("sigaddset");
1037
exitcode = EXIT_FAILURE;
1038
goto end;
1039
}
1040
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1041
if(ret == -1){
1042
perror("sigaddset");
1043
exitcode = EXIT_FAILURE;
1044
goto end;
1045
}
1046
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1047
if(ret == -1){
1048
perror("sigaddset");
1049
exitcode = EXIT_FAILURE;
1050
goto end;
1051
}
1052
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1053
if(ret == -1){
1054
perror("sigaction");
1055
exitcode = EXIT_FAILURE;
1056
goto end;
1057
}
1058
1059
/* If the interface is down, bring it up */
1060
if(interface[0] != '\0'){
1061
#ifdef __linux__
1062
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1063
messages to mess up the prompt */
1064
ret = klogctl(8, NULL, 5);
1065
bool restore_loglevel = true;
1066
if(ret == -1){
1067
restore_loglevel = false;
1068
perror("klogctl");
1069
}
1070
#endif /* __linux__ */
1071
1072
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1073
if(sd < 0){
1074
perror("socket");
1075
exitcode = EXIT_FAILURE;
1076
#ifdef __linux__
1077
if(restore_loglevel){
1078
ret = klogctl(7, NULL, 0);
1079
if(ret == -1){
1080
perror("klogctl");
1081
}
1082
}
1083
#endif /* __linux__ */
1084
goto end;
1085
}
1086
strcpy(network.ifr_name, interface);
1087
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1088
if(ret == -1){
1089
perror("ioctl SIOCGIFFLAGS");
1090
#ifdef __linux__
1091
if(restore_loglevel){
1092
ret = klogctl(7, NULL, 0);
1093
if(ret == -1){
1094
perror("klogctl");
1095
}
1096
}
1097
#endif /* __linux__ */
1098
exitcode = EXIT_FAILURE;
1099
goto end;
1100
}
1101
if((network.ifr_flags & IFF_UP) == 0){
1102
network.ifr_flags |= IFF_UP;
1103
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1104
if(ret == -1){
1105
perror("ioctl SIOCSIFFLAGS");
1106
exitcode = EXIT_FAILURE;
1107
#ifdef __linux__
1108
if(restore_loglevel){
1109
ret = klogctl(7, NULL, 0);
1110
if(ret == -1){
1111
perror("klogctl");
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);
1112
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;
1113
902
}
1114
#endif /* __linux__ */
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;
1115
914
goto end;
1116
915
}
1117
interface_taken_up = true;
1118
916
}
1119
/* sleep checking until interface is running */
1120
for(int i=0; i < delay * 4; i++){
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);
1121
927
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1122
928
if(ret == -1){
1123
929
perror("ioctl SIOCGIFFLAGS");
1124
} else if(network.ifr_flags & IFF_RUNNING){
1125
break;
1126
}
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1128
ret = nanosleep(&sleeptime, NULL);
1129
if(ret == -1 and errno != EINTR){
1130
perror("nanosleep");
1131
}
1132
}
1133
if(not interface_taken_up){
1134
ret = (int)TEMP_FAILURE_RETRY(close(sd));
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));
1135
943
if(ret == -1){
1136
944
perror("close");
1137
945
}
1138
946
}
1139
#ifdef __linux__
1140
if(restore_loglevel){
1141
/* Restores kernel loglevel to default */
1142
ret = klogctl(7, NULL, 0);
1143
if(ret == -1){
1144
perror("klogctl");
1145
}
1146
}
1147
#endif /* __linux__ */
1148
}
1149
1150
uid = getuid();
1151
gid = getgid();
1152
1153
errno = 0;
1154
setgid(gid);
1155
if(ret == -1){
1156
perror("setgid");
1157
}
1158
1159
ret = setuid(uid);
1160
if(ret == -1){
1161
perror("setuid");
1162
}
1163
1164
ret = init_gnutls_global(pubkey, seckey);
1165
if(ret == -1){
1166
fprintf(stderr, "init_gnutls_global failed\n");
1167
exitcode = EXIT_FAILURE;
1168
goto end;
1169
} else {
1170
gnutls_initialized = true;
1171
}
1172
1173
if(mkdtemp(tempdir) == NULL){
1174
perror("mkdtemp");
1175
goto end;
1176
}
1177
tempdir_created = true;
1178
1179
if(not init_gpgme(pubkey, seckey, tempdir)){
1180
fprintf(stderr, "init_gpgme failed\n");
1181
exitcode = EXIT_FAILURE;
1182
goto end;
1183
} else {
1184
gpgme_initialized = true;
1185
}
1186
1187
if(interface[0] != '\0'){
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
1188
984
if_index = (AvahiIfIndex) if_nametoindex(interface);
1189
985
if(if_index == 0){
1190
986
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1191
exitcode = EXIT_FAILURE;
1192
goto end;
1193
}
1194
}
1195
1196
if(connect_to != NULL){
1197
/* Connect directly, do not use Zeroconf */
1198
/* (Mainly meant for debugging) */
1199
char *address = strrchr(connect_to, ':');
1200
if(address == NULL){
1201
fprintf(stderr, "No colon in address\n");
1202
exitcode = EXIT_FAILURE;
1203
goto end;
1204
}
1205
uint16_t port;
1206
errno = 0;
1207
tmpmax = strtoimax(address+1, &tmp, 10);
1208
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1209
or tmpmax != (uint16_t)tmpmax){
1210
fprintf(stderr, "Bad port number\n");
1211
exitcode = EXIT_FAILURE;
1212
goto end;
1213
}
1214
port = (uint16_t)tmpmax;
1215
*address = '\0';
1216
address = connect_to;
1217
/* Colon in address indicates IPv6 */
1218
int af;
1219
if(strchr(address, ':') != NULL){
1220
af = AF_INET6;
1221
} else {
1222
af = AF_INET;
1223
}
1224
ret = start_mandos_communication(address, port, if_index, af);
1225
if(ret < 0){
1226
exitcode = EXIT_FAILURE;
1227
} else {
1228
exitcode = EXIT_SUCCESS;
1229
}
1230
goto end;
1231
}
1232
1233
{
1234
AvahiServerConfig config;
1235
/* Do not publish any local Zeroconf records */
1236
avahi_server_config_init(&config);
1237
config.publish_hinfo = 0;
1238
config.publish_addresses = 0;
1239
config.publish_workstation = 0;
1240
config.publish_domain = 0;
1241
1242
/* Allocate a new server */
1243
mc.server = avahi_server_new(avahi_simple_poll_get
1244
(mc.simple_poll), &config, NULL,
1245
NULL, &error);
1246
1247
/* Free the Avahi configuration data */
1248
avahi_server_config_free(&config);
1249
}
1250
1251
/* Check if creating the Avahi server object succeeded */
1252
if(mc.server == NULL){
1253
fprintf(stderr, "Failed to create Avahi server: %s\n",
1254
avahi_strerror(error));
1255
exitcode = EXIT_FAILURE;
1256
goto end;
1257
}
1258
1259
/* Create the Avahi service browser */
1260
sb = avahi_s_service_browser_new(mc.server, if_index,
1261
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1262
NULL, 0, browse_callback, NULL);
1263
if(sb == NULL){
1264
fprintf(stderr, "Failed to create service browser: %s\n",
1265
avahi_strerror(avahi_server_errno(mc.server)));
1266
exitcode = EXIT_FAILURE;
1267
goto end;
1268
}
1269
1270
/* Run the main loop */
1271
1272
if(debug){
1273
fprintf(stderr, "Starting Avahi loop search\n");
1274
}
1275
1276
avahi_simple_poll_loop(mc.simple_poll);
1277
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
1278
1079
end:
1279
1280
if(debug){
1281
fprintf(stderr, "%s exiting\n", argv[0]);
1282
}
1283
1284
/* Cleanup things */
1285
if(sb != NULL)
1286
avahi_s_service_browser_free(sb);
1287
1288
if(mc.server != NULL)
1289
avahi_server_free(mc.server);
1290
1291
if(mc.simple_poll != NULL)
1292
avahi_simple_poll_free(mc.simple_poll);
1293
1294
if(gnutls_initialized){
1295
gnutls_certificate_free_credentials(mc.cred);
1296
gnutls_global_deinit();
1297
gnutls_dh_params_deinit(mc.dh_params);
1298
}
1299
1300
if(gpgme_initialized){
1301
gpgme_release(mc.ctx);
1302
}
1303
1304
/* Take down the network interface */
1305
if(interface_taken_up){
1306
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1307
if(ret == -1){
1308
perror("ioctl SIOCGIFFLAGS");
1309
} else if(network.ifr_flags & IFF_UP) {
1310
network.ifr_flags &= ~IFF_UP; /* clear flag */
1311
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1312
if(ret == -1){
1313
perror("ioctl SIOCSIFFLAGS");
1314
}
1315
}
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1317
if(ret == -1){
1318
perror("close");
1319
}
1320
}
1321
1322
/* Removes the temp directory used by GPGME */
1323
if(tempdir_created){
1324
DIR *d;
1325
struct dirent *direntry;
1326
d = opendir(tempdir);
1327
if(d == NULL){
1328
if(errno != ENOENT){
1080
1081
if (debug){
1082
fprintf(stderr, "%s exiting\n", argv[0]);
1083
}
1084
1085
/* Cleanup things */
1086
if (sb != NULL)
1087
avahi_s_service_browser_free(sb);
1088
1089
if (mc.server != NULL)
1090
avahi_server_free(mc.server);
1091
1092
if (mc.simple_poll != NULL)
1093
avahi_simple_poll_free(mc.simple_poll);
1094
1095
if (gnutls_initalized){
1096
gnutls_certificate_free_credentials(mc.cred);
1097
gnutls_global_deinit ();
1098
gnutls_dh_params_deinit(mc.dh_params);
1099
}
1100
1101
if(gpgme_initalized){
1102
gpgme_release(mc.ctx);
1103
}
1104
1105
/* Removes the temp directory used by GPGME */
1106
if(tempdir[0] != '\0'){
1107
DIR *d;
1108
struct dirent *direntry;
1109
d = opendir(tempdir);
1110
if(d == NULL){
1329
1111
perror("opendir");
1330
}
1331
} else {
1332
while(true){
1333
direntry = readdir(d);
1334
if(direntry == NULL){
1335
break;
1336
}
1337
/* Skip "." and ".." */
1338
if(direntry->d_name[0] == '.'
1339
and (direntry->d_name[1] == '\0'
1340
or (direntry->d_name[1] == '.'
1341
and direntry->d_name[2] == '\0'))){
1342
continue;
1343
}
1344
char *fullname = NULL;
1345
ret = asprintf(&fullname, "%s/%s", tempdir,
1346
direntry->d_name);
1347
if(ret < 0){
1348
perror("asprintf");
1349
continue;
1350
}
1351
ret = remove(fullname);
1352
if(ret == -1){
1353
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1354
strerror(errno));
1355
}
1356
free(fullname);
1357
}
1358
closedir(d);
1359
}
1360
ret = rmdir(tempdir);
1361
if(ret == -1 and errno != ENOENT){
1362
perror("rmdir");
1363
}
1364
}
1365
1366
return exitcode;
1112
} else {
1113
while(true){
1114
direntry = readdir(d);
1115
if(direntry == NULL){
1116
break;
1117
}
1118
if (direntry->d_type == DT_REG){
1119
char *fullname = NULL;
1120
ret = asprintf(&fullname, "%s/%s", tempdir,
1121
direntry->d_name);
1122
if(ret < 0){
1123
perror("asprintf");
1124
continue;
1125
}
1126
ret = unlink(fullname);
1127
if(ret == -1){
1128
fprintf(stderr, "unlink(\"%s\"): %s",
1129
fullname, strerror(errno));
1130
}
1131
free(fullname);
1132
}
1133
}
1134
closedir(d);
1135
}
1136
ret = rmdir(tempdir);
1137
if(ret == -1){
1138
perror("rmdir");
1139
}
1140
}
1141
1142
return exitcode;
1367
1143
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0