To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 217
- compare with another revision
- download diff
- download tarball
- view history from revision 217
- Committer: Teddy Hogeborn
- Date: 2008-09-30 07:23:39 UTC
- Revision ID: teddy@fukt.bsnet.se-20080930072339-jn15gyrtfpdk2dhx
* .bzrignore: Added "man" directory (created by "make install-html").
* Makefile: Add "common.ent" dependency to all manual pages.
(htmldir, version, SED): New variables.
(CFLAGS): Add -D option to define VERSION to $(version).
(MANPOST, HTMLPOST): Use $(SED).
(PROGS): Use $(CPROGS)
(CPROGS): New; C-only programs.
(objects): Use $(CPROGS).
(common.ent, mandos, mandos-keygen): New targets; update version
number to $(version).
(clean): Use $(CPROGS).
(check): Depend on "all".
(install-html): Install to $(htmldir).
* common.ent: New file with "version" entity.
* mandos-clients.conf.xml: Use "common.ent".
* mandos-keygen.xml: - '' -
* mandos.conf.xml: - '' -
* mandos.xml: - '' -
* plugin-runner.xml: - '' -
* plugins.d/mandos-client.xml: - '' -
* plugins.d/password-prompt.xml: - '' -
* plugin-runner.c (argp_program_version): Use VERSION.
* plugins.d/mandos-client.c (argp_program_version): - '' -
* plugins.d/password-prompt.c (argp_program_version): - '' -
* Makefile: Add "common.ent" dependency to all manual pages.
(htmldir, version, SED): New variables.
(CFLAGS): Add -D option to define VERSION to $(version).
(MANPOST, HTMLPOST): Use $(SED).
(PROGS): Use $(CPROGS)
(CPROGS): New; C-only programs.
(objects): Use $(CPROGS).
(common.ent, mandos, mandos-keygen): New targets; update version
number to $(version).
(clean): Use $(CPROGS).
(check): Depend on "all".
(install-html): Install to $(htmldir).
* common.ent: New file with "version" entity.
* mandos-clients.conf.xml: Use "common.ent".
* mandos-keygen.xml: - '' -
* mandos.conf.xml: - '' -
* mandos.xml: - '' -
* plugin-runner.xml: - '' -
* plugins.d/mandos-client.xml: - '' -
* plugins.d/password-prompt.xml: - '' -
* plugin-runner.c (argp_program_version): Use VERSION.
* plugins.d/mandos-client.c (argp_program_version): - '' -
* plugins.d/password-prompt.c (argp_program_version): - '' -
- files added:
- debian/mandos-client.config
- files removed:
- NEWS
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif
39
34
40
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
36
42
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
38
stdout, ferror() */
44
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#include <stddef.h> /* NULL, size_t, ssize_t */
46
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
#include <stdbool.h> /* bool, false, true */
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
45
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
46
#include <sys/ioctl.h> /* ioctl */
52
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
48
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
56
51
#include <sys/stat.h> /* open() */
57
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
53
struct in6_addr, inet_pton(),
54
connect() */
59
55
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
64
58
#include <assert.h> /* assert() */
65
59
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
60
#include <time.h> /* time() */
67
61
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
62
SIOCSIFFLAGS, if_indextoname(),
69
63
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
64
#include <netinet/in.h>
73
65
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
66
getuid(), getgid(), setuid(),
75
67
setgid() */
76
68
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
69
#include <iso646.h> /* not, and */
78
70
#include <argp.h> /* struct argp_option, error_t, struct
79
71
argp_state, struct argp,
80
72
argp_parse(), ARGP_KEY_ARG,
81
73
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
89
74
90
75
/* Avahi */
91
76
/* All Avahi types, constants and functions
104
89
gnutls_*
105
90
init_gnutls_session(),
106
91
GNUTLS_* */
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
109
93
GNUTLS_OPENPGP_FMT_BASE64 */
110
94
111
95
/* GPGME */
137
121
gpgme_ctx_t ctx;
138
122
} mandos_context;
139
123
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
144
145
124
/*
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
125
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
126
* "buffer_capacity" is how much is currently allocated,
148
127
* "buffer_length" is how much is already used.
149
128
*/
150
size_t incbuffer(char **buffer, size_t buffer_length,
129
size_t adjustbuffer(char **buffer, size_t buffer_length,
151
130
size_t buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
131
if (buffer_length + BUFFER_SIZE > buffer_capacity){
153
132
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
133
if (buffer == NULL){
155
134
return 0;
156
135
}
157
136
buffer_capacity += BUFFER_SIZE;
162
141
/*
163
142
* Initialize GPGME.
164
143
*/
165
static bool init_gpgme(const char *seckey,
144
static bool init_gpgme(mandos_context *mc, const char *seckey,
166
145
const char *pubkey, const char *tempdir){
167
146
int ret;
168
147
gpgme_error_t rc;
170
149
171
150
172
151
/*
173
* Helper function to insert pub and seckey to the engine keyring.
152
* Helper function to insert pub and seckey to the enigne keyring.
174
153
*/
175
154
bool import_key(const char *filename){
176
155
int fd;
177
156
gpgme_data_t pgp_data;
178
157
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
158
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
159
if(fd == -1){
181
160
perror("open");
182
161
return false;
183
162
}
184
163
185
164
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
if(rc != GPG_ERR_NO_ERROR){
165
if (rc != GPG_ERR_NO_ERROR){
187
166
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
167
gpgme_strsource(rc), gpgme_strerror(rc));
189
168
return false;
190
169
}
191
170
192
rc = gpgme_op_import(mc.ctx, pgp_data);
193
if(rc != GPG_ERR_NO_ERROR){
171
rc = gpgme_op_import(mc->ctx, pgp_data);
172
if (rc != GPG_ERR_NO_ERROR){
194
173
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
174
gpgme_strsource(rc), gpgme_strerror(rc));
196
175
return false;
197
176
}
198
177
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
178
ret = TEMP_FAILURE_RETRY(close(fd));
200
179
if(ret == -1){
201
180
perror("close");
202
181
}
204
183
return true;
205
184
}
206
185
207
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
186
if (debug){
187
fprintf(stderr, "Initialize gpgme\n");
209
188
}
210
189
211
190
/* Init GPGME */
212
191
gpgme_check_version(NULL);
213
192
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
if(rc != GPG_ERR_NO_ERROR){
193
if (rc != GPG_ERR_NO_ERROR){
215
194
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
195
gpgme_strsource(rc), gpgme_strerror(rc));
217
196
return false;
218
197
}
219
198
220
199
/* Set GPGME home directory for the OpenPGP engine only */
221
rc = gpgme_get_engine_info(&engine_info);
222
if(rc != GPG_ERR_NO_ERROR){
200
rc = gpgme_get_engine_info (&engine_info);
201
if (rc != GPG_ERR_NO_ERROR){
223
202
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
203
gpgme_strsource(rc), gpgme_strerror(rc));
225
204
return false;
238
217
}
239
218
240
219
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
242
if(rc != GPG_ERR_NO_ERROR){
220
rc = gpgme_new(&(mc->ctx));
221
if (rc != GPG_ERR_NO_ERROR){
243
222
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
223
gpgme_strsource(rc), gpgme_strerror(rc));
245
224
return false;
246
225
}
247
226
248
if(not import_key(pubkey) or not import_key(seckey)){
227
if (not import_key(pubkey) or not import_key(seckey)){
249
228
return false;
250
229
}
251
230
252
return true;
231
return true;
253
232
}
254
233
255
234
/*
256
235
* Decrypt OpenPGP data.
257
236
* Returns -1 on error
258
237
*/
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
size_t crypto_size,
261
char **plaintext){
238
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
239
const char *cryptotext,
240
size_t crypto_size,
241
char **plaintext){
262
242
gpgme_data_t dh_crypto, dh_plain;
263
243
gpgme_error_t rc;
264
244
ssize_t ret;
265
245
size_t plaintext_capacity = 0;
266
246
ssize_t plaintext_length = 0;
267
247
268
if(debug){
248
if (debug){
269
249
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
270
250
}
271
251
272
252
/* Create new GPGME data buffer from memory cryptotext */
273
253
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
254
0);
275
if(rc != GPG_ERR_NO_ERROR){
255
if (rc != GPG_ERR_NO_ERROR){
276
256
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
257
gpgme_strsource(rc), gpgme_strerror(rc));
278
258
return -1;
280
260
281
261
/* Create new empty GPGME data buffer for the plaintext */
282
262
rc = gpgme_data_new(&dh_plain);
283
if(rc != GPG_ERR_NO_ERROR){
263
if (rc != GPG_ERR_NO_ERROR){
284
264
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
265
gpgme_strsource(rc), gpgme_strerror(rc));
286
266
gpgme_data_release(dh_crypto);
289
269
290
270
/* Decrypt data from the cryptotext data buffer to the plaintext
291
271
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
272
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
273
if (rc != GPG_ERR_NO_ERROR){
294
274
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
275
gpgme_strsource(rc), gpgme_strerror(rc));
296
276
plaintext_length = -1;
297
if(debug){
277
if (debug){
298
278
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
300
if(result == NULL){
279
result = gpgme_op_decrypt_result(mc->ctx);
280
if (result == NULL){
301
281
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
302
282
} else {
303
283
fprintf(stderr, "Unsupported algorithm: %s\n",
309
289
}
310
290
gpgme_recipient_t recipient;
311
291
recipient = result->recipients;
312
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
319
recipient = recipient->next;
292
if(recipient){
293
while(recipient != NULL){
294
fprintf(stderr, "Public key algorithm: %s\n",
295
gpgme_pubkey_algo_name(recipient->pubkey_algo));
296
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
297
fprintf(stderr, "Secret key available: %s\n",
298
recipient->status == GPG_ERR_NO_SECKEY
299
? "No" : "Yes");
300
recipient = recipient->next;
301
}
320
302
}
321
303
}
322
304
}
328
310
}
329
311
330
312
/* Seek back to the beginning of the GPGME plaintext data buffer */
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
313
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
332
314
perror("gpgme_data_seek");
333
315
plaintext_length = -1;
334
316
goto decrypt_end;
336
318
337
319
*plaintext = NULL;
338
320
while(true){
339
plaintext_capacity = incbuffer(plaintext,
321
plaintext_capacity = adjustbuffer(plaintext,
340
322
(size_t)plaintext_length,
341
323
plaintext_capacity);
342
if(plaintext_capacity == 0){
343
perror("incbuffer");
324
if (plaintext_capacity == 0){
325
perror("adjustbuffer");
344
326
plaintext_length = -1;
345
327
goto decrypt_end;
346
328
}
348
330
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
349
331
BUFFER_SIZE);
350
332
/* Print the data, if any */
351
if(ret == 0){
333
if (ret == 0){
352
334
/* EOF */
353
335
break;
354
336
}
378
360
return plaintext_length;
379
361
}
380
362
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
384
if(ret == NULL)
363
static const char * safer_gnutls_strerror (int value) {
364
const char *ret = gnutls_strerror (value); /* Spurious warning */
365
if (ret == NULL)
385
366
ret = "(unknown)";
386
367
return ret;
387
368
}
392
373
fprintf(stderr, "GnuTLS: %s", string);
393
374
}
394
375
395
static int init_gnutls_global(const char *pubkeyfilename,
376
static int init_gnutls_global(mandos_context *mc,
377
const char *pubkeyfilename,
396
378
const char *seckeyfilename){
397
379
int ret;
398
380
401
383
}
402
384
403
385
ret = gnutls_global_init();
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
386
if (ret != GNUTLS_E_SUCCESS) {
387
fprintf (stderr, "GnuTLS global_init: %s\n",
388
safer_gnutls_strerror(ret));
407
389
return -1;
408
390
}
409
391
410
if(debug){
392
if (debug){
411
393
/* "Use a log level over 10 to enable all debugging options."
412
394
* - GnuTLS manual
413
395
*/
416
398
}
417
399
418
400
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
420
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
426
gnutls_global_deinit();
401
gnutls_certificate_allocate_credentials(&mc->cred);
402
if (ret != GNUTLS_E_SUCCESS){
403
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
404
warning */
405
safer_gnutls_strerror(ret));
406
gnutls_global_deinit ();
427
407
return -1;
428
408
}
429
409
434
414
}
435
415
436
416
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
417
(mc->cred, pubkeyfilename, seckeyfilename,
438
418
GNUTLS_OPENPGP_FMT_BASE64);
439
if(ret != GNUTLS_E_SUCCESS){
419
if (ret != GNUTLS_E_SUCCESS) {
440
420
fprintf(stderr,
441
421
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
422
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
446
426
}
447
427
448
428
/* GnuTLS server initialization */
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
429
ret = gnutls_dh_params_init(&mc->dh_params);
430
if (ret != GNUTLS_E_SUCCESS) {
431
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
432
" %s\n", safer_gnutls_strerror(ret));
453
433
goto globalfail;
454
434
}
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
435
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
436
if (ret != GNUTLS_E_SUCCESS) {
437
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
438
safer_gnutls_strerror(ret));
459
439
goto globalfail;
460
440
}
461
441
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
442
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
463
443
464
444
return 0;
465
445
466
446
globalfail:
467
447
468
gnutls_certificate_free_credentials(mc.cred);
448
gnutls_certificate_free_credentials(mc->cred);
469
449
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
450
gnutls_dh_params_deinit(mc->dh_params);
471
451
return -1;
472
452
}
473
453
474
static int init_gnutls_session(gnutls_session_t *session){
454
static int init_gnutls_session(mandos_context *mc,
455
gnutls_session_t *session){
475
456
int ret;
476
457
/* GnuTLS session creation */
477
458
ret = gnutls_init(session, GNUTLS_SERVER);
478
if(ret != GNUTLS_E_SUCCESS){
459
if (ret != GNUTLS_E_SUCCESS){
479
460
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
461
safer_gnutls_strerror(ret));
481
462
}
482
463
483
464
{
484
465
const char *err;
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
486
if(ret != GNUTLS_E_SUCCESS){
466
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
467
if (ret != GNUTLS_E_SUCCESS) {
487
468
fprintf(stderr, "Syntax error at: %s\n", err);
488
469
fprintf(stderr, "GnuTLS error: %s\n",
489
470
safer_gnutls_strerror(ret));
490
gnutls_deinit(*session);
471
gnutls_deinit (*session);
491
472
return -1;
492
473
}
493
474
}
494
475
495
476
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
497
if(ret != GNUTLS_E_SUCCESS){
477
mc->cred);
478
if (ret != GNUTLS_E_SUCCESS) {
498
479
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
480
safer_gnutls_strerror(ret));
500
gnutls_deinit(*session);
481
gnutls_deinit (*session);
501
482
return -1;
502
483
}
503
484
504
485
/* ignore client certificate if any. */
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
486
gnutls_certificate_server_set_request (*session,
487
GNUTLS_CERT_IGNORE);
507
488
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
489
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
509
490
510
491
return 0;
511
492
}
514
495
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
515
496
__attribute__((unused)) const char *txt){}
516
497
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
520
498
/* Called when a Mandos server is found */
521
499
static int start_mandos_communication(const char *ip, uint16_t port,
522
500
AvahiIfIndex if_index,
523
int af){
501
mandos_context *mc){
524
502
int ret, tcp_sd;
525
ssize_t sret;
526
union {
527
struct sockaddr_in in;
528
struct sockaddr_in6 in6;
529
} to;
503
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
530
504
char *buffer = NULL;
531
505
char *decrypted_buffer;
532
506
size_t buffer_length = 0;
534
508
ssize_t decrypted_buffer_size;
535
509
size_t written;
536
510
int retval = 0;
511
char interface[IF_NAMESIZE];
537
512
gnutls_session_t session;
538
int pf; /* Protocol family */
539
540
switch(af){
541
case AF_INET6:
542
pf = PF_INET6;
543
break;
544
case AF_INET:
545
pf = PF_INET;
546
break;
547
default:
548
fprintf(stderr, "Bad address family: %d\n", af);
549
return -1;
550
}
551
552
ret = init_gnutls_session(&session);
553
if(ret != 0){
513
514
ret = init_gnutls_session (mc, &session);
515
if (ret != 0){
554
516
return -1;
555
517
}
556
518
557
519
if(debug){
558
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
520
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
559
521
"\n", ip, port);
560
522
}
561
523
562
tcp_sd = socket(pf, SOCK_STREAM, 0);
563
if(tcp_sd < 0){
524
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
525
if(tcp_sd < 0) {
564
526
perror("socket");
565
527
return -1;
566
528
}
567
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
568
538
memset(&to, 0, sizeof(to));
569
if(af == AF_INET6){
570
to.in6.sin6_family = (sa_family_t)af;
571
ret = inet_pton(af, ip, &to.in6.sin6_addr);
572
} else { /* IPv4 */
573
to.in.sin_family = (sa_family_t)af;
574
ret = inet_pton(af, ip, &to.in.sin_addr);
575
}
576
if(ret < 0 ){
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 ){
577
544
perror("inet_pton");
578
545
return -1;
579
546
}
581
548
fprintf(stderr, "Bad address: %s\n", ip);
582
549
return -1;
583
550
}
584
if(af == AF_INET6){
585
to.in6.sin6_port = htons(port); /* Spurious warnings from
586
-Wconversion and
587
-Wunreachable-code */
588
589
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
590
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
591
-Wunreachable-code*/
592
if(if_index == AVAHI_IF_UNSPEC){
593
fprintf(stderr, "An IPv6 link-local address is incomplete"
594
" without a network interface\n");
595
return -1;
596
}
597
/* Set the network interface number as scope */
598
to.in6.sin6_scope_id = (uint32_t)if_index;
599
}
600
} else {
601
to.in.sin_port = htons(port); /* Spurious warnings from
602
-Wconversion and
603
-Wunreachable-code */
604
}
551
to.in6.sin6_port = htons(port); /* Spurious warning */
552
553
to.in6.sin6_scope_id = (uint32_t)if_index;
605
554
606
555
if(debug){
607
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
608
char interface[IF_NAMESIZE];
609
if(if_indextoname((unsigned int)if_index, interface) == NULL){
610
perror("if_indextoname");
611
} else {
612
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
613
ip, interface, port);
614
}
615
} else {
616
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
617
port);
618
}
619
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
620
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
621
const char *pcret;
622
if(af == AF_INET6){
623
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
624
sizeof(addrstr));
625
} else {
626
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
627
sizeof(addrstr));
628
}
629
if(pcret == NULL){
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){
630
561
perror("inet_ntop");
631
562
} else {
632
563
if(strcmp(addrstr, ip) != 0){
635
566
}
636
567
}
637
568
638
if(af == AF_INET6){
639
ret = connect(tcp_sd, &to.in6, sizeof(to));
640
} else {
641
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
642
}
643
if(ret < 0){
569
ret = connect(tcp_sd, &to.in, sizeof(to));
570
if (ret < 0){
644
571
perror("connect");
645
572
return -1;
646
573
}
647
574
648
575
const char *out = mandos_protocol_version;
649
576
written = 0;
650
while(true){
577
while (true){
651
578
size_t out_size = strlen(out);
652
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
579
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
653
580
out_size - written));
654
if(ret == -1){
581
if (ret == -1){
655
582
perror("write");
656
583
retval = -1;
657
584
goto mandos_end;
660
587
if(written < out_size){
661
588
continue;
662
589
} else {
663
if(out == mandos_protocol_version){
590
if (out == mandos_protocol_version){
664
591
written = 0;
665
592
out = "\r\n";
666
593
} else {
673
600
fprintf(stderr, "Establishing TLS session with %s\n", ip);
674
601
}
675
602
676
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
603
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
677
604
678
605
do{
679
ret = gnutls_handshake(session);
606
ret = gnutls_handshake (session);
680
607
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
681
608
682
if(ret != GNUTLS_E_SUCCESS){
609
if (ret != GNUTLS_E_SUCCESS){
683
610
if(debug){
684
611
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
685
gnutls_perror(ret);
612
gnutls_perror (ret);
686
613
}
687
614
retval = -1;
688
615
goto mandos_end;
691
618
/* Read OpenPGP packet that contains the wanted password */
692
619
693
620
if(debug){
694
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
621
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
695
622
ip);
696
623
}
697
624
698
625
while(true){
699
buffer_capacity = incbuffer(&buffer, buffer_length,
626
buffer_capacity = adjustbuffer(&buffer, buffer_length,
700
627
buffer_capacity);
701
if(buffer_capacity == 0){
702
perror("incbuffer");
628
if (buffer_capacity == 0){
629
perror("adjustbuffer");
703
630
retval = -1;
704
631
goto mandos_end;
705
632
}
706
633
707
sret = gnutls_record_recv(session, buffer+buffer_length,
708
BUFFER_SIZE);
709
if(sret == 0){
634
ret = gnutls_record_recv(session, buffer+buffer_length,
635
BUFFER_SIZE);
636
if (ret == 0){
710
637
break;
711
638
}
712
if(sret < 0){
713
switch(sret){
639
if (ret < 0){
640
switch(ret){
714
641
case GNUTLS_E_INTERRUPTED:
715
642
case GNUTLS_E_AGAIN:
716
643
break;
717
644
case GNUTLS_E_REHANDSHAKE:
718
645
do{
719
ret = gnutls_handshake(session);
646
ret = gnutls_handshake (session);
720
647
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
721
if(ret < 0){
648
if (ret < 0){
722
649
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
723
gnutls_perror(ret);
650
gnutls_perror (ret);
724
651
retval = -1;
725
652
goto mandos_end;
726
653
}
729
656
fprintf(stderr, "Unknown error while reading data from"
730
657
" encrypted session with Mandos server\n");
731
658
retval = -1;
732
gnutls_bye(session, GNUTLS_SHUT_RDWR);
659
gnutls_bye (session, GNUTLS_SHUT_RDWR);
733
660
goto mandos_end;
734
661
}
735
662
} else {
736
buffer_length += (size_t) sret;
663
buffer_length += (size_t) ret;
737
664
}
738
665
}
739
666
741
668
fprintf(stderr, "Closing TLS session\n");
742
669
}
743
670
744
gnutls_bye(session, GNUTLS_SHUT_RDWR);
671
gnutls_bye (session, GNUTLS_SHUT_RDWR);
745
672
746
if(buffer_length > 0){
747
decrypted_buffer_size = pgp_packet_decrypt(buffer,
673
if (buffer_length > 0){
674
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
748
675
buffer_length,
749
676
&decrypted_buffer);
750
if(decrypted_buffer_size >= 0){
677
if (decrypted_buffer_size >= 0){
751
678
written = 0;
752
679
while(written < (size_t) decrypted_buffer_size){
753
ret = (int)fwrite(decrypted_buffer + written, 1,
754
(size_t)decrypted_buffer_size - written,
755
stdout);
680
ret = (int)fwrite (decrypted_buffer + written, 1,
681
(size_t)decrypted_buffer_size - written,
682
stdout);
756
683
if(ret == 0 and ferror(stdout)){
757
684
if(debug){
758
685
fprintf(stderr, "Error writing encrypted data: %s\n",
775
702
776
703
mandos_end:
777
704
free(buffer);
778
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
705
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
779
706
if(ret == -1){
780
707
perror("close");
781
708
}
782
gnutls_deinit(session);
709
gnutls_deinit (session);
783
710
return retval;
784
711
}
785
712
786
713
static void resolve_callback(AvahiSServiceResolver *r,
787
714
AvahiIfIndex interface,
788
AvahiProtocol proto,
715
AVAHI_GCC_UNUSED AvahiProtocol protocol,
789
716
AvahiResolverEvent event,
790
717
const char *name,
791
718
const char *type,
796
723
AVAHI_GCC_UNUSED AvahiStringList *txt,
797
724
AVAHI_GCC_UNUSED AvahiLookupResultFlags
798
725
flags,
799
AVAHI_GCC_UNUSED void* userdata){
726
void* userdata) {
727
mandos_context *mc = userdata;
800
728
assert(r);
801
729
802
730
/* Called whenever a service has been resolved successfully or
803
731
timed out */
804
732
805
if(quit_now){
806
return;
807
}
808
809
switch(event){
733
switch (event) {
810
734
default:
811
735
case AVAHI_RESOLVER_FAILURE:
812
736
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
813
737
" of type '%s' in domain '%s': %s\n", name, type, domain,
814
avahi_strerror(avahi_server_errno(mc.server)));
738
avahi_strerror(avahi_server_errno(mc->server)));
815
739
break;
816
740
817
741
case AVAHI_RESOLVER_FOUND:
820
744
avahi_address_snprint(ip, sizeof(ip), address);
821
745
if(debug){
822
746
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
823
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
824
ip, (intmax_t)interface, port);
747
PRIu16 ") on port %d\n", name, host_name, ip,
748
interface, port);
825
749
}
826
int ret = start_mandos_communication(ip, port, interface,
827
avahi_proto_to_af(proto));
828
if(ret == 0){
829
avahi_simple_poll_quit(mc.simple_poll);
750
int ret = start_mandos_communication(ip, port, interface, mc);
751
if (ret == 0){
752
avahi_simple_poll_quit(mc->simple_poll);
830
753
}
831
754
}
832
755
}
833
756
avahi_s_service_resolver_free(r);
834
757
}
835
758
836
static void browse_callback(AvahiSServiceBrowser *b,
837
AvahiIfIndex interface,
838
AvahiProtocol protocol,
839
AvahiBrowserEvent event,
840
const char *name,
841
const char *type,
842
const char *domain,
843
AVAHI_GCC_UNUSED AvahiLookupResultFlags
844
flags,
845
AVAHI_GCC_UNUSED void* userdata){
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;
846
770
assert(b);
847
771
848
772
/* Called whenever a new services becomes available on the LAN or
849
773
is removed from the LAN */
850
774
851
switch(event){
775
switch (event) {
852
776
default:
853
777
case AVAHI_BROWSER_FAILURE:
854
778
855
779
fprintf(stderr, "(Avahi browser) %s\n",
856
avahi_strerror(avahi_server_errno(mc.server)));
857
avahi_simple_poll_quit(mc.simple_poll);
780
avahi_strerror(avahi_server_errno(mc->server)));
781
avahi_simple_poll_quit(mc->simple_poll);
858
782
return;
859
783
860
784
case AVAHI_BROWSER_NEW:
863
787
the callback function is called the Avahi server will free the
864
788
resolver for us. */
865
789
866
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
867
name, type, domain, protocol, 0,
868
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)))
869
794
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
870
name, avahi_strerror(avahi_server_errno(mc.server)));
795
name, avahi_strerror(avahi_server_errno(mc->server)));
871
796
break;
872
797
873
798
case AVAHI_BROWSER_REMOVE:
882
807
}
883
808
}
884
809
885
/* stop main loop after sigterm has been called */
886
static void handle_sigterm(int sig){
887
if(quit_now){
888
return;
889
}
890
quit_now = 1;
891
signal_received = sig;
892
int old_errno = errno;
893
if(mc.simple_poll != NULL){
894
avahi_simple_poll_quit(mc.simple_poll);
895
}
896
errno = old_errno;
897
}
898
899
810
int main(int argc, char *argv[]){
900
AvahiSServiceBrowser *sb = NULL;
901
int error;
902
int ret;
903
intmax_t tmpmax;
904
char *tmp;
905
int exitcode = EXIT_SUCCESS;
906
const char *interface = "eth0";
907
struct ifreq network;
908
int sd = -1;
909
bool take_down_interface = false;
910
uid_t uid;
911
gid_t gid;
912
char *connect_to = NULL;
913
char tempdir[] = "/tmp/mandosXXXXXX";
914
bool tempdir_created = false;
915
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
916
const char *seckey = PATHDIR "/" SECKEY;
917
const char *pubkey = PATHDIR "/" PUBKEY;
918
919
bool gnutls_initialized = false;
920
bool gpgme_initialized = false;
921
float delay = 2.5f;
922
923
struct sigaction old_sigterm_action;
924
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
925
926
{
927
struct argp_option options[] = {
928
{ .name = "debug", .key = 128,
929
.doc = "Debug mode", .group = 3 },
930
{ .name = "connect", .key = 'c',
931
.arg = "ADDRESS:PORT",
932
.doc = "Connect directly to a specific Mandos server",
933
.group = 1 },
934
{ .name = "interface", .key = 'i',
935
.arg = "NAME",
936
.doc = "Network interface that will be used to search for"
937
" Mandos servers",
938
.group = 1 },
939
{ .name = "seckey", .key = 's',
940
.arg = "FILE",
941
.doc = "OpenPGP secret key file base name",
942
.group = 1 },
943
{ .name = "pubkey", .key = 'p',
944
.arg = "FILE",
945
.doc = "OpenPGP public key file base name",
946
.group = 2 },
947
{ .name = "dh-bits", .key = 129,
948
.arg = "BITS",
949
.doc = "Bit length of the prime number used in the"
950
" Diffie-Hellman key exchange",
951
.group = 2 },
952
{ .name = "priority", .key = 130,
953
.arg = "STRING",
954
.doc = "GnuTLS priority string for the TLS handshake",
955
.group = 1 },
956
{ .name = "delay", .key = 131,
957
.arg = "SECONDS",
958
.doc = "Maximum delay to wait for interface startup",
959
.group = 2 },
960
{ .name = NULL }
961
};
962
963
error_t parse_opt(int key, char *arg,
964
struct argp_state *state){
965
switch(key){
966
case 128: /* --debug */
967
debug = true;
968
break;
969
case 'c': /* --connect */
970
connect_to = arg;
971
break;
972
case 'i': /* --interface */
973
interface = arg;
974
break;
975
case 's': /* --seckey */
976
seckey = arg;
977
break;
978
case 'p': /* --pubkey */
979
pubkey = arg;
980
break;
981
case 129: /* --dh-bits */
982
errno = 0;
983
tmpmax = strtoimax(arg, &tmp, 10);
984
if(errno != 0 or tmp == arg or *tmp != '\0'
985
or tmpmax != (typeof(mc.dh_bits))tmpmax){
986
fprintf(stderr, "Bad number of DH bits\n");
987
exit(EXIT_FAILURE);
988
}
989
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
990
break;
991
case 130: /* --priority */
992
mc.priority = arg;
993
break;
994
case 131: /* --delay */
995
errno = 0;
996
delay = strtof(arg, &tmp);
997
if(errno != 0 or tmp == arg or *tmp != '\0'){
998
fprintf(stderr, "Bad delay\n");
999
exit(EXIT_FAILURE);
1000
}
1001
break;
1002
case ARGP_KEY_ARG:
1003
argp_usage(state);
1004
case ARGP_KEY_END:
1005
break;
1006
default:
1007
return ARGP_ERR_UNKNOWN;
1008
}
1009
return 0;
1010
}
1011
1012
struct argp argp = { .options = options, .parser = parse_opt,
1013
.args_doc = "",
1014
.doc = "Mandos client -- Get and decrypt"
1015
" passwords from a Mandos server" };
1016
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1017
if(ret == ARGP_ERR_UNKNOWN){
1018
fprintf(stderr, "Unknown error while parsing arguments\n");
1019
exitcode = EXIT_FAILURE;
1020
goto end;
1021
}
1022
}
1023
1024
if(not debug){
1025
avahi_set_log_function(empty_log);
1026
}
1027
1028
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1029
from the signal handler */
1030
/* Initialize the pseudo-RNG for Avahi */
1031
srand((unsigned int) time(NULL));
1032
mc.simple_poll = avahi_simple_poll_new();
1033
if(mc.simple_poll == NULL){
1034
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1035
exitcode = EXIT_FAILURE;
1036
goto end;
1037
}
1038
1039
sigemptyset(&sigterm_action.sa_mask);
1040
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1041
if(ret == -1){
1042
perror("sigaddset");
1043
exitcode = EXIT_FAILURE;
1044
goto end;
1045
}
1046
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1047
if(ret == -1){
1048
perror("sigaddset");
1049
exitcode = EXIT_FAILURE;
1050
goto end;
1051
}
1052
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1053
if(ret == -1){
1054
perror("sigaddset");
1055
exitcode = EXIT_FAILURE;
1056
goto end;
1057
}
1058
/* Need to check if the handler is SIG_IGN before handling:
1059
| [[info:libc:Initial Signal Actions]] |
1060
| [[info:libc:Basic Signal Handling]] |
1061
*/
1062
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1063
if(ret == -1){
1064
perror("sigaction");
1065
return EXIT_FAILURE;
1066
}
1067
if(old_sigterm_action.sa_handler != SIG_IGN){
1068
ret = sigaction(SIGINT, &sigterm_action, NULL);
1069
if(ret == -1){
1070
perror("sigaction");
1071
exitcode = EXIT_FAILURE;
1072
goto end;
1073
}
1074
}
1075
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1076
if(ret == -1){
1077
perror("sigaction");
1078
return EXIT_FAILURE;
1079
}
1080
if(old_sigterm_action.sa_handler != SIG_IGN){
1081
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1082
if(ret == -1){
1083
perror("sigaction");
1084
exitcode = EXIT_FAILURE;
1085
goto end;
1086
}
1087
}
1088
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1089
if(ret == -1){
1090
perror("sigaction");
1091
return EXIT_FAILURE;
1092
}
1093
if(old_sigterm_action.sa_handler != SIG_IGN){
1094
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1095
if(ret == -1){
1096
perror("sigaction");
1097
exitcode = EXIT_FAILURE;
1098
goto end;
1099
}
1100
}
1101
1102
/* If the interface is down, bring it up */
1103
if(interface[0] != '\0'){
811
AvahiSServiceBrowser *sb = NULL;
812
int error;
813
int ret;
814
int exitcode = EXIT_SUCCESS;
815
const char *interface = "eth0";
816
struct ifreq network;
817
int sd;
818
uid_t uid;
819
gid_t gid;
820
char *connect_to = NULL;
821
char tempdir[] = "/tmp/mandosXXXXXX";
822
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
823
const char *seckey = PATHDIR "/" SECKEY;
824
const char *pubkey = PATHDIR "/" PUBKEY;
825
826
mandos_context mc = { .simple_poll = NULL, .server = NULL,
827
.dh_bits = 1024, .priority = "SECURE256"
828
":!CTYPE-X.509:+CTYPE-OPENPGP" };
829
bool gnutls_initalized = false;
830
bool gpgme_initalized = false;
831
832
{
833
struct argp_option options[] = {
834
{ .name = "debug", .key = 128,
835
.doc = "Debug mode", .group = 3 },
836
{ .name = "connect", .key = 'c',
837
.arg = "ADDRESS:PORT",
838
.doc = "Connect directly to a specific Mandos server",
839
.group = 1 },
840
{ .name = "interface", .key = 'i',
841
.arg = "NAME",
842
.doc = "Interface that will be used to search for Mandos"
843
" servers",
844
.group = 1 },
845
{ .name = "seckey", .key = 's',
846
.arg = "FILE",
847
.doc = "OpenPGP secret key file base name",
848
.group = 1 },
849
{ .name = "pubkey", .key = 'p',
850
.arg = "FILE",
851
.doc = "OpenPGP public key file base name",
852
.group = 2 },
853
{ .name = "dh-bits", .key = 129,
854
.arg = "BITS",
855
.doc = "Bit length of the prime number used in the"
856
" Diffie-Hellman key exchange",
857
.group = 2 },
858
{ .name = "priority", .key = 130,
859
.arg = "STRING",
860
.doc = "GnuTLS priority string for the TLS handshake",
861
.group = 1 },
862
{ .name = NULL }
863
};
864
865
error_t parse_opt (int key, char *arg,
866
struct argp_state *state) {
867
/* Get the INPUT argument from `argp_parse', which we know is
868
a pointer to our plugin list pointer. */
869
switch (key) {
870
case 128: /* --debug */
871
debug = true;
872
break;
873
case 'c': /* --connect */
874
connect_to = arg;
875
break;
876
case 'i': /* --interface */
877
interface = arg;
878
break;
879
case 's': /* --seckey */
880
seckey = arg;
881
break;
882
case 'p': /* --pubkey */
883
pubkey = arg;
884
break;
885
case 129: /* --dh-bits */
886
errno = 0;
887
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
888
if (errno){
889
perror("strtol");
890
exit(EXIT_FAILURE);
891
}
892
break;
893
case 130: /* --priority */
894
mc.priority = arg;
895
break;
896
case ARGP_KEY_ARG:
897
argp_usage (state);
898
case ARGP_KEY_END:
899
break;
900
default:
901
return ARGP_ERR_UNKNOWN;
902
}
903
return 0;
904
}
905
906
struct argp argp = { .options = options, .parser = parse_opt,
907
.args_doc = "",
908
.doc = "Mandos client -- Get and decrypt"
909
" passwords from a Mandos server" };
910
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
911
if (ret == ARGP_ERR_UNKNOWN){
912
fprintf(stderr, "Unknown error while parsing arguments\n");
913
exitcode = EXIT_FAILURE;
914
goto end;
915
}
916
}
917
918
/* If the interface is down, bring it up */
919
{
920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
921
if(sd < 0) {
922
perror("socket");
923
exitcode = EXIT_FAILURE;
924
goto end;
925
}
926
strcpy(network.ifr_name, interface);
927
ret = ioctl(sd, SIOCGIFFLAGS, &network);
928
if(ret == -1){
929
perror("ioctl SIOCGIFFLAGS");
930
exitcode = EXIT_FAILURE;
931
goto end;
932
}
933
if((network.ifr_flags & IFF_UP) == 0){
934
network.ifr_flags |= IFF_UP;
935
ret = ioctl(sd, SIOCSIFFLAGS, &network);
936
if(ret == -1){
937
perror("ioctl SIOCSIFFLAGS");
938
exitcode = EXIT_FAILURE;
939
goto end;
940
}
941
}
942
ret = TEMP_FAILURE_RETRY(close(sd));
943
if(ret == -1){
944
perror("close");
945
}
946
}
947
948
uid = getuid();
949
gid = getgid();
950
951
ret = setuid(uid);
952
if (ret == -1){
953
perror("setuid");
954
}
955
956
setgid(gid);
957
if (ret == -1){
958
perror("setgid");
959
}
960
961
ret = init_gnutls_global(&mc, pubkey, seckey);
962
if (ret == -1){
963
fprintf(stderr, "init_gnutls_global failed\n");
964
exitcode = EXIT_FAILURE;
965
goto end;
966
} else {
967
gnutls_initalized = true;
968
}
969
970
if(mkdtemp(tempdir) == NULL){
971
perror("mkdtemp");
972
tempdir[0] = '\0';
973
goto end;
974
}
975
976
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
977
fprintf(stderr, "gpgme_initalized failed\n");
978
exitcode = EXIT_FAILURE;
979
goto end;
980
} else {
981
gpgme_initalized = true;
982
}
983
1104
984
if_index = (AvahiIfIndex) if_nametoindex(interface);
1105
985
if(if_index == 0){
1106
986
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1107
exitcode = EXIT_FAILURE;
1108
goto end;
1109
}
1110
1111
if(quit_now){
1112
goto end;
1113
}
1114
1115
#ifdef __linux__
1116
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1117
messages to mess up the prompt */
1118
ret = klogctl(8, NULL, 5);
1119
bool restore_loglevel = true;
1120
if(ret == -1){
1121
restore_loglevel = false;
1122
perror("klogctl");
1123
}
1124
#endif /* __linux__ */
1125
1126
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1127
if(sd < 0){
1128
perror("socket");
1129
exitcode = EXIT_FAILURE;
1130
#ifdef __linux__
1131
if(restore_loglevel){
1132
ret = klogctl(7, NULL, 0);
1133
if(ret == -1){
1134
perror("klogctl");
1135
}
1136
}
1137
#endif /* __linux__ */
1138
goto end;
1139
}
1140
strcpy(network.ifr_name, interface);
1141
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1142
if(ret == -1){
1143
perror("ioctl SIOCGIFFLAGS");
1144
#ifdef __linux__
1145
if(restore_loglevel){
1146
ret = klogctl(7, NULL, 0);
1147
if(ret == -1){
1148
perror("klogctl");
1149
}
1150
}
1151
#endif /* __linux__ */
1152
exitcode = EXIT_FAILURE;
1153
goto end;
1154
}
1155
if((network.ifr_flags & IFF_UP) == 0){
1156
network.ifr_flags |= IFF_UP;
1157
take_down_interface = true;
1158
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1159
if(ret == -1){
1160
take_down_interface = false;
1161
perror("ioctl SIOCSIFFLAGS");
1162
exitcode = EXIT_FAILURE;
1163
#ifdef __linux__
1164
if(restore_loglevel){
1165
ret = klogctl(7, NULL, 0);
1166
if(ret == -1){
1167
perror("klogctl");
1168
}
1169
}
1170
#endif /* __linux__ */
1171
goto end;
1172
}
1173
}
1174
/* sleep checking until interface is running */
1175
for(int i=0; i < delay * 4; i++){
1176
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1177
if(ret == -1){
1178
perror("ioctl SIOCGIFFLAGS");
1179
} else if(network.ifr_flags & IFF_RUNNING){
1180
break;
1181
}
1182
struct timespec sleeptime = { .tv_nsec = 250000000 };
1183
ret = nanosleep(&sleeptime, NULL);
1184
if(ret == -1 and errno != EINTR){
1185
perror("nanosleep");
1186
}
1187
}
1188
if(not take_down_interface){
1189
/* We won't need the socket anymore */
1190
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1191
if(ret == -1){
1192
perror("close");
1193
}
1194
}
1195
#ifdef __linux__
1196
if(restore_loglevel){
1197
/* Restores kernel loglevel to default */
1198
ret = klogctl(7, NULL, 0);
1199
if(ret == -1){
1200
perror("klogctl");
1201
}
1202
}
1203
#endif /* __linux__ */
1204
}
1205
1206
if(quit_now){
1207
goto end;
1208
}
1209
1210
uid = getuid();
1211
gid = getgid();
1212
1213
errno = 0;
1214
setgid(gid);
1215
if(ret == -1){
1216
perror("setgid");
1217
}
1218
1219
ret = setuid(uid);
1220
if(ret == -1){
1221
perror("setuid");
1222
}
1223
1224
if(quit_now){
1225
goto end;
1226
}
1227
1228
ret = init_gnutls_global(pubkey, seckey);
1229
if(ret == -1){
1230
fprintf(stderr, "init_gnutls_global failed\n");
1231
exitcode = EXIT_FAILURE;
1232
goto end;
1233
} else {
1234
gnutls_initialized = true;
1235
}
1236
1237
if(quit_now){
1238
goto end;
1239
}
1240
1241
tempdir_created = true;
1242
if(mkdtemp(tempdir) == NULL){
1243
tempdir_created = false;
1244
perror("mkdtemp");
1245
goto end;
1246
}
1247
1248
if(quit_now){
1249
goto end;
1250
}
1251
1252
if(not init_gpgme(pubkey, seckey, tempdir)){
1253
fprintf(stderr, "init_gpgme failed\n");
1254
exitcode = EXIT_FAILURE;
1255
goto end;
1256
} else {
1257
gpgme_initialized = true;
1258
}
1259
1260
if(quit_now){
1261
goto end;
1262
}
1263
1264
if(connect_to != NULL){
1265
/* Connect directly, do not use Zeroconf */
1266
/* (Mainly meant for debugging) */
1267
char *address = strrchr(connect_to, ':');
1268
if(address == NULL){
1269
fprintf(stderr, "No colon in address\n");
1270
exitcode = EXIT_FAILURE;
1271
goto end;
1272
}
1273
1274
if(quit_now){
1275
goto end;
1276
}
1277
1278
uint16_t port;
1279
errno = 0;
1280
tmpmax = strtoimax(address+1, &tmp, 10);
1281
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1282
or tmpmax != (uint16_t)tmpmax){
1283
fprintf(stderr, "Bad port number\n");
1284
exitcode = EXIT_FAILURE;
1285
goto end;
1286
}
1287
1288
if(quit_now){
1289
goto end;
1290
}
1291
1292
port = (uint16_t)tmpmax;
1293
*address = '\0';
1294
address = connect_to;
1295
/* Colon in address indicates IPv6 */
1296
int af;
1297
if(strchr(address, ':') != NULL){
1298
af = AF_INET6;
1299
} else {
1300
af = AF_INET;
1301
}
1302
1303
if(quit_now){
1304
goto end;
1305
}
1306
1307
ret = start_mandos_communication(address, port, if_index, af);
1308
if(ret < 0){
1309
exitcode = EXIT_FAILURE;
1310
} else {
1311
exitcode = EXIT_SUCCESS;
1312
}
1313
goto end;
1314
}
1315
1316
if(quit_now){
1317
goto end;
1318
}
1319
1320
{
1321
AvahiServerConfig config;
1322
/* Do not publish any local Zeroconf records */
1323
avahi_server_config_init(&config);
1324
config.publish_hinfo = 0;
1325
config.publish_addresses = 0;
1326
config.publish_workstation = 0;
1327
config.publish_domain = 0;
1328
1329
/* Allocate a new server */
1330
mc.server = avahi_server_new(avahi_simple_poll_get
1331
(mc.simple_poll), &config, NULL,
1332
NULL, &error);
1333
1334
/* Free the Avahi configuration data */
1335
avahi_server_config_free(&config);
1336
}
1337
1338
/* Check if creating the Avahi server object succeeded */
1339
if(mc.server == NULL){
1340
fprintf(stderr, "Failed to create Avahi server: %s\n",
1341
avahi_strerror(error));
1342
exitcode = EXIT_FAILURE;
1343
goto end;
1344
}
1345
1346
if(quit_now){
1347
goto end;
1348
}
1349
1350
/* Create the Avahi service browser */
1351
sb = avahi_s_service_browser_new(mc.server, if_index,
1352
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1353
NULL, 0, browse_callback, NULL);
1354
if(sb == NULL){
1355
fprintf(stderr, "Failed to create service browser: %s\n",
1356
avahi_strerror(avahi_server_errno(mc.server)));
1357
exitcode = EXIT_FAILURE;
1358
goto end;
1359
}
1360
1361
if(quit_now){
1362
goto end;
1363
}
1364
1365
/* Run the main loop */
1366
1367
if(debug){
1368
fprintf(stderr, "Starting Avahi loop search\n");
1369
}
1370
1371
avahi_simple_poll_loop(mc.simple_poll);
1372
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
1373
1079
end:
1374
1375
if(debug){
1376
fprintf(stderr, "%s exiting\n", argv[0]);
1377
}
1378
1379
/* Cleanup things */
1380
if(sb != NULL)
1381
avahi_s_service_browser_free(sb);
1382
1383
if(mc.server != NULL)
1384
avahi_server_free(mc.server);
1385
1386
if(mc.simple_poll != NULL)
1387
avahi_simple_poll_free(mc.simple_poll);
1388
1389
if(gnutls_initialized){
1390
gnutls_certificate_free_credentials(mc.cred);
1391
gnutls_global_deinit();
1392
gnutls_dh_params_deinit(mc.dh_params);
1393
}
1394
1395
if(gpgme_initialized){
1396
gpgme_release(mc.ctx);
1397
}
1398
1399
/* Take down the network interface */
1400
if(take_down_interface){
1401
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1402
if(ret == -1){
1403
perror("ioctl SIOCGIFFLAGS");
1404
} else if(network.ifr_flags & IFF_UP) {
1405
network.ifr_flags &= ~IFF_UP; /* clear flag */
1406
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1407
if(ret == -1){
1408
perror("ioctl SIOCSIFFLAGS");
1409
}
1410
}
1411
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1412
if(ret == -1){
1413
perror("close");
1414
}
1415
}
1416
1417
/* Removes the temp directory used by GPGME */
1418
if(tempdir_created){
1419
DIR *d;
1420
struct dirent *direntry;
1421
d = opendir(tempdir);
1422
if(d == NULL){
1423
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){
1424
1111
perror("opendir");
1425
}
1426
} else {
1427
while(true){
1428
direntry = readdir(d);
1429
if(direntry == NULL){
1430
break;
1431
}
1432
/* Skip "." and ".." */
1433
if(direntry->d_name[0] == '.'
1434
and (direntry->d_name[1] == '\0'
1435
or (direntry->d_name[1] == '.'
1436
and direntry->d_name[2] == '\0'))){
1437
continue;
1438
}
1439
char *fullname = NULL;
1440
ret = asprintf(&fullname, "%s/%s", tempdir,
1441
direntry->d_name);
1442
if(ret < 0){
1443
perror("asprintf");
1444
continue;
1445
}
1446
ret = remove(fullname);
1447
if(ret == -1){
1448
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1449
strerror(errno));
1450
}
1451
free(fullname);
1452
}
1453
closedir(d);
1454
}
1455
ret = rmdir(tempdir);
1456
if(ret == -1 and errno != ENOENT){
1457
perror("rmdir");
1458
}
1459
}
1460
1461
if(quit_now){
1462
sigemptyset(&old_sigterm_action.sa_mask);
1463
old_sigterm_action.sa_handler = SIG_DFL;
1464
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1465
if(ret == -1){
1466
perror("sigaction");
1467
}
1468
raise(signal_received);
1469
}
1470
1471
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;
1472
1143
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0