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- Committer: Teddy Hogeborn
- Date: 2008-08-17 06:01:58 UTC
- Revision ID: teddy@fukt.bsnet.se-20080817060158-o5xakkih6t3br9yq
* Makefile (GNUTLS_CFLAGS, GNUTLS_LIBS, AVAHI_CFLAGS, AVAHI_LIBS,
GPGME_CFLAGS, GPGME_LIBS): New; use libgnutls-config,
pkg-config, and gpgme-config to
get the correct compiler and
linker flags.
(MANPOST): New post-processing stage to man pages to fix a bug with
having "\n" in the DocBook pages.
(objects): Use $(addsuffix) instead of a for loop in a subshell.
(plugin-runner, plugins.d/password-prompt): Removed; targets no
longer necessary.
(.PHONY): Added "doc".
* mandos.xml: Much improved.
* plugins.d/password-request.xml: Improved SEE ALSO section.
GPGME_CFLAGS, GPGME_LIBS): New; use libgnutls-config,
pkg-config, and gpgme-config to
get the correct compiler and
linker flags.
(MANPOST): New post-processing stage to man pages to fix a bug with
having "\n" in the DocBook pages.
(objects): Use $(addsuffix) instead of a for loop in a subshell.
(plugin-runner, plugins.d/password-prompt): Removed; targets no
longer necessary.
(.PHONY): Added "doc".
* mandos.xml: Much improved.
* plugins.d/password-request.xml: Improved SEE ALSO section.
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugins.d/password-request.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 © 2007-2008 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
36
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
36
38
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
38
stdout, ferror() */
41
39
#include <stdint.h> /* uint16_t, uint32_t */
42
40
#include <stddef.h> /* NULL, size_t, ssize_t */
43
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
42
srand() */
45
#include <stdbool.h> /* bool, false, true */
43
#include <stdbool.h> /* bool, true */
46
44
#include <string.h> /* memset(), strcmp(), strlen(),
47
45
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
46
#include <sys/ioctl.h> /* ioctl */
49
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
48
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, uid_t, gid_t, open(),
52
opendir(), DIR */
53
#include <sys/stat.h> /* open() */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
54
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
inet_pton(), connect() */
56
#include <fcntl.h> /* open() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
58
*/
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
53
struct in6_addr, inet_pton(),
54
connect() */
60
55
#include <assert.h> /* assert() */
61
56
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
57
#include <time.h> /* time() */
63
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
64
59
SIOCSIFFLAGS, if_indextoname(),
65
60
if_nametoindex(), IF_NAMESIZE */
66
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
*/
69
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
62
getuid(), getgid(), setuid(),
71
63
setgid() */
64
#include <netinet/in.h>
72
65
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, or, and */
66
#include <iso646.h> /* not, and */
74
67
#include <argp.h> /* struct argp_option, error_t, struct
75
68
argp_state, struct argp,
76
69
argp_parse(), ARGP_KEY_ARG,
77
70
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
#include <signal.h> /* sigemptyset(), sigaddset(),
79
sigaction(), SIGTERM, sigaction */
80
81
#ifdef __linux__
82
#include <sys/klog.h> /* klogctl() */
83
#endif
84
71
85
72
/* Avahi */
86
73
/* All Avahi types, constants and functions
99
86
gnutls_*
100
87
init_gnutls_session(),
101
88
GNUTLS_* */
102
#include <gnutls/openpgp.h>
103
/* gnutls_certificate_set_openpgp_key_file(),
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
104
90
GNUTLS_OPENPGP_FMT_BASE64 */
105
91
106
92
/* GPGME */
112
98
113
99
#define BUFFER_SIZE 256
114
100
115
#define PATHDIR "/conf/conf.d/mandos"
116
#define SECKEY "seckey.txt"
117
#define PUBKEY "pubkey.txt"
118
119
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
120
103
static const char mandos_protocol_version[] = "1";
121
const char *argp_program_version = "mandos-client " VERSION;
104
const char *argp_program_version = "password-request 1.0";
122
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
123
106
124
107
/* Used for passing in values through the Avahi callback functions */
129
112
unsigned int dh_bits;
130
113
gnutls_dh_params_t dh_params;
131
114
const char *priority;
132
gpgme_ctx_t ctx;
133
115
} mandos_context;
134
116
135
/* global context so signal handler can reach it*/
136
mandos_context mc;
137
138
117
/*
139
* Make additional room in "buffer" for at least BUFFER_SIZE
140
* additional bytes. "buffer_capacity" is how much is currently
141
* allocated, "buffer_length" is how much is already used.
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
120
* "buffer_length" is how much is already used.
142
121
*/
143
size_t incbuffer(char **buffer, size_t buffer_length,
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
144
123
size_t buffer_capacity){
145
if(buffer_length + BUFFER_SIZE > buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
146
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
147
if(buffer == NULL){
126
if (buffer == NULL){
148
127
return 0;
149
128
}
150
129
buffer_capacity += BUFFER_SIZE;
153
132
}
154
133
155
134
/*
156
* Initialize GPGME.
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
157
137
*/
158
static bool init_gpgme(const char *seckey,
159
const char *pubkey, const char *tempdir){
160
int ret;
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
143
gpgme_ctx_t ctx;
161
144
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
162
148
gpgme_engine_info_t engine_info;
163
149
164
165
/*
166
* Helper function to insert pub and seckey to the engine keyring.
167
*/
168
bool import_key(const char *filename){
169
int fd;
170
gpgme_data_t pgp_data;
171
172
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
173
if(fd == -1){
174
perror("open");
175
return false;
176
}
177
178
rc = gpgme_data_new_from_fd(&pgp_data, fd);
179
if(rc != GPG_ERR_NO_ERROR){
180
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
181
gpgme_strsource(rc), gpgme_strerror(rc));
182
return false;
183
}
184
185
rc = gpgme_op_import(mc.ctx, pgp_data);
186
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
189
return false;
190
}
191
192
ret = (int)TEMP_FAILURE_RETRY(close(fd));
193
if(ret == -1){
194
perror("close");
195
}
196
gpgme_data_release(pgp_data);
197
return true;
198
}
199
200
if(debug){
201
fprintf(stderr, "Initializing GPGME\n");
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
202
152
}
203
153
204
154
/* Init GPGME */
205
155
gpgme_check_version(NULL);
206
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
207
if(rc != GPG_ERR_NO_ERROR){
157
if (rc != GPG_ERR_NO_ERROR){
208
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
209
159
gpgme_strsource(rc), gpgme_strerror(rc));
210
return false;
160
return -1;
211
161
}
212
162
213
/* Set GPGME home directory for the OpenPGP engine only */
214
rc = gpgme_get_engine_info(&engine_info);
215
if(rc != GPG_ERR_NO_ERROR){
163
/* Set GPGME home directory for the OpenPGP engine only */
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
216
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
217
167
gpgme_strsource(rc), gpgme_strerror(rc));
218
return false;
168
return -1;
219
169
}
220
170
while(engine_info != NULL){
221
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
222
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
223
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
224
174
break;
225
175
}
226
176
engine_info = engine_info->next;
227
177
}
228
178
if(engine_info == NULL){
229
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
230
return false;
231
}
232
233
/* Create new GPGME "context" */
234
rc = gpgme_new(&(mc.ctx));
235
if(rc != GPG_ERR_NO_ERROR){
236
fprintf(stderr, "bad gpgme_new: %s: %s\n",
237
gpgme_strsource(rc), gpgme_strerror(rc));
238
return false;
239
}
240
241
if(not import_key(pubkey) or not import_key(seckey)){
242
return false;
243
}
244
245
return true;
246
}
247
248
/*
249
* Decrypt OpenPGP data.
250
* Returns -1 on error
251
*/
252
static ssize_t pgp_packet_decrypt(const char *cryptotext,
253
size_t crypto_size,
254
char **plaintext){
255
gpgme_data_t dh_crypto, dh_plain;
256
gpgme_error_t rc;
257
ssize_t ret;
258
size_t plaintext_capacity = 0;
259
ssize_t plaintext_length = 0;
260
261
if(debug){
262
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
263
181
}
264
182
265
183
/* Create new GPGME data buffer from memory cryptotext */
266
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
267
185
0);
268
if(rc != GPG_ERR_NO_ERROR){
186
if (rc != GPG_ERR_NO_ERROR){
269
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
270
188
gpgme_strsource(rc), gpgme_strerror(rc));
271
189
return -1;
273
191
274
192
/* Create new empty GPGME data buffer for the plaintext */
275
193
rc = gpgme_data_new(&dh_plain);
276
if(rc != GPG_ERR_NO_ERROR){
194
if (rc != GPG_ERR_NO_ERROR){
277
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
278
196
gpgme_strsource(rc), gpgme_strerror(rc));
279
197
gpgme_data_release(dh_crypto);
280
198
return -1;
281
199
}
282
200
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
207
goto decrypt_end;
208
}
209
283
210
/* Decrypt data from the cryptotext data buffer to the plaintext
284
211
data buffer */
285
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
286
if(rc != GPG_ERR_NO_ERROR){
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
287
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
288
215
gpgme_strsource(rc), gpgme_strerror(rc));
289
216
plaintext_length = -1;
290
if(debug){
291
gpgme_decrypt_result_t result;
292
result = gpgme_op_decrypt_result(mc.ctx);
293
if(result == NULL){
294
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
295
} else {
296
fprintf(stderr, "Unsupported algorithm: %s\n",
297
result->unsupported_algorithm);
298
fprintf(stderr, "Wrong key usage: %u\n",
299
result->wrong_key_usage);
300
if(result->file_name != NULL){
301
fprintf(stderr, "File name: %s\n", result->file_name);
302
}
303
gpgme_recipient_t recipient;
304
recipient = result->recipients;
305
if(recipient){
306
while(recipient != NULL){
307
fprintf(stderr, "Public key algorithm: %s\n",
308
gpgme_pubkey_algo_name(recipient->pubkey_algo));
309
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
310
fprintf(stderr, "Secret key available: %s\n",
311
recipient->status == GPG_ERR_NO_SECKEY
312
? "No" : "Yes");
313
recipient = recipient->next;
314
}
315
}
316
}
317
}
318
217
goto decrypt_end;
319
218
}
320
219
322
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
323
222
}
324
223
224
if (debug){
225
gpgme_decrypt_result_t result;
226
result = gpgme_op_decrypt_result(ctx);
227
if (result == NULL){
228
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
229
} else {
230
fprintf(stderr, "Unsupported algorithm: %s\n",
231
result->unsupported_algorithm);
232
fprintf(stderr, "Wrong key usage: %u\n",
233
result->wrong_key_usage);
234
if(result->file_name != NULL){
235
fprintf(stderr, "File name: %s\n", result->file_name);
236
}
237
gpgme_recipient_t recipient;
238
recipient = result->recipients;
239
if(recipient){
240
while(recipient != NULL){
241
fprintf(stderr, "Public key algorithm: %s\n",
242
gpgme_pubkey_algo_name(recipient->pubkey_algo));
243
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
244
fprintf(stderr, "Secret key available: %s\n",
245
recipient->status == GPG_ERR_NO_SECKEY
246
? "No" : "Yes");
247
recipient = recipient->next;
248
}
249
}
250
}
251
}
252
325
253
/* Seek back to the beginning of the GPGME plaintext data buffer */
326
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
327
perror("gpgme_data_seek");
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
328
256
plaintext_length = -1;
329
257
goto decrypt_end;
330
258
}
331
259
332
260
*plaintext = NULL;
333
261
while(true){
334
plaintext_capacity = incbuffer(plaintext,
262
plaintext_capacity = adjustbuffer(plaintext,
335
263
(size_t)plaintext_length,
336
264
plaintext_capacity);
337
if(plaintext_capacity == 0){
338
perror("incbuffer");
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
339
267
plaintext_length = -1;
340
268
goto decrypt_end;
341
269
}
343
271
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
344
272
BUFFER_SIZE);
345
273
/* Print the data, if any */
346
if(ret == 0){
274
if (ret == 0){
347
275
/* EOF */
348
276
break;
349
277
}
354
282
}
355
283
plaintext_length += ret;
356
284
}
357
285
358
286
if(debug){
359
287
fprintf(stderr, "Decrypted password is: ");
360
288
for(ssize_t i = 0; i < plaintext_length; i++){
373
301
return plaintext_length;
374
302
}
375
303
376
static const char * safer_gnutls_strerror(int value){
377
const char *ret = gnutls_strerror(value); /* Spurious warning from
378
-Wunreachable-code */
379
if(ret == NULL)
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value);
306
if (ret == NULL)
380
307
ret = "(unknown)";
381
308
return ret;
382
309
}
387
314
fprintf(stderr, "GnuTLS: %s", string);
388
315
}
389
316
390
static int init_gnutls_global(const char *pubkeyfilename,
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfilename,
391
319
const char *seckeyfilename){
392
320
int ret;
393
321
396
324
}
397
325
398
326
ret = gnutls_global_init();
399
if(ret != GNUTLS_E_SUCCESS){
400
fprintf(stderr, "GnuTLS global_init: %s\n",
401
safer_gnutls_strerror(ret));
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
402
330
return -1;
403
331
}
404
332
405
if(debug){
333
if (debug){
406
334
/* "Use a log level over 10 to enable all debugging options."
407
335
* - GnuTLS manual
408
336
*/
411
339
}
412
340
413
341
/* OpenPGP credentials */
414
gnutls_certificate_allocate_credentials(&mc.cred);
415
if(ret != GNUTLS_E_SUCCESS){
416
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
417
from
418
-Wunreachable-code
419
*/
420
safer_gnutls_strerror(ret));
421
gnutls_global_deinit();
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
422
347
return -1;
423
348
}
424
349
425
350
if(debug){
426
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
427
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
428
353
seckeyfilename);
429
354
}
430
355
431
356
ret = gnutls_certificate_set_openpgp_key_file
432
(mc.cred, pubkeyfilename, seckeyfilename,
357
(mc->cred, pubkeyfilename, seckeyfilename,
433
358
GNUTLS_OPENPGP_FMT_BASE64);
434
if(ret != GNUTLS_E_SUCCESS){
359
if (ret != GNUTLS_E_SUCCESS) {
435
360
fprintf(stderr,
436
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
437
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
438
fprintf(stderr, "The GnuTLS error is: %s\n",
363
fprintf(stdout, "The GnuTLS error is: %s\n",
439
364
safer_gnutls_strerror(ret));
440
365
goto globalfail;
441
366
}
442
367
443
368
/* GnuTLS server initialization */
444
ret = gnutls_dh_params_init(&mc.dh_params);
445
if(ret != GNUTLS_E_SUCCESS){
446
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
447
" %s\n", safer_gnutls_strerror(ret));
448
goto globalfail;
449
}
450
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
451
if(ret != GNUTLS_E_SUCCESS){
452
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
453
safer_gnutls_strerror(ret));
454
goto globalfail;
455
}
456
457
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
458
369
ret = gnutls_dh_params_init(&mc->dh_params);
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
373
goto globalfail;
374
}
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
379
goto globalfail;
380
}
381
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
383
459
384
return 0;
460
385
461
386
globalfail:
462
463
gnutls_certificate_free_credentials(mc.cred);
387
388
gnutls_certificate_free_credentials(mc->cred);
464
389
gnutls_global_deinit();
465
gnutls_dh_params_deinit(mc.dh_params);
466
390
return -1;
391
467
392
}
468
393
469
static int init_gnutls_session(gnutls_session_t *session){
394
static int init_gnutls_session(mandos_context *mc,
395
gnutls_session_t *session){
470
396
int ret;
471
397
/* GnuTLS session creation */
472
398
ret = gnutls_init(session, GNUTLS_SERVER);
473
if(ret != GNUTLS_E_SUCCESS){
399
if (ret != GNUTLS_E_SUCCESS){
474
400
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
475
401
safer_gnutls_strerror(ret));
476
402
}
477
403
478
404
{
479
405
const char *err;
480
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
481
if(ret != GNUTLS_E_SUCCESS){
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
407
if (ret != GNUTLS_E_SUCCESS) {
482
408
fprintf(stderr, "Syntax error at: %s\n", err);
483
409
fprintf(stderr, "GnuTLS error: %s\n",
484
410
safer_gnutls_strerror(ret));
485
gnutls_deinit(*session);
411
gnutls_deinit (*session);
486
412
return -1;
487
413
}
488
414
}
489
415
490
416
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
491
mc.cred);
492
if(ret != GNUTLS_E_SUCCESS){
417
mc->cred);
418
if (ret != GNUTLS_E_SUCCESS) {
493
419
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
494
420
safer_gnutls_strerror(ret));
495
gnutls_deinit(*session);
421
gnutls_deinit (*session);
496
422
return -1;
497
423
}
498
424
499
425
/* ignore client certificate if any. */
500
gnutls_certificate_server_set_request(*session,
501
GNUTLS_CERT_IGNORE);
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
502
428
503
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
504
430
505
431
return 0;
506
432
}
512
438
/* Called when a Mandos server is found */
513
439
static int start_mandos_communication(const char *ip, uint16_t port,
514
440
AvahiIfIndex if_index,
515
int af){
441
mandos_context *mc){
516
442
int ret, tcp_sd;
517
ssize_t sret;
518
union {
519
struct sockaddr_in in;
520
struct sockaddr_in6 in6;
521
} to;
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
522
444
char *buffer = NULL;
523
445
char *decrypted_buffer;
524
446
size_t buffer_length = 0;
526
448
ssize_t decrypted_buffer_size;
527
449
size_t written;
528
450
int retval = 0;
451
char interface[IF_NAMESIZE];
529
452
gnutls_session_t session;
530
int pf; /* Protocol family */
531
532
switch(af){
533
case AF_INET6:
534
pf = PF_INET6;
535
break;
536
case AF_INET:
537
pf = PF_INET;
538
break;
539
default:
540
fprintf(stderr, "Bad address family: %d\n", af);
541
return -1;
542
}
543
544
ret = init_gnutls_session(&session);
545
if(ret != 0){
453
454
ret = init_gnutls_session (mc, &session);
455
if (ret != 0){
546
456
return -1;
547
457
}
548
458
549
459
if(debug){
550
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
460
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
551
461
"\n", ip, port);
552
462
}
553
463
554
tcp_sd = socket(pf, SOCK_STREAM, 0);
555
if(tcp_sd < 0){
464
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
465
if(tcp_sd < 0) {
556
466
perror("socket");
557
467
return -1;
558
468
}
469
470
if(debug){
471
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
perror("if_indextoname");
473
return -1;
474
}
475
fprintf(stderr, "Binding to interface %s\n", interface);
476
}
559
477
560
memset(&to, 0, sizeof(to));
561
if(af == AF_INET6){
562
to.in6.sin6_family = (uint16_t)af;
563
ret = inet_pton(af, ip, &to.in6.sin6_addr);
564
} else { /* IPv4 */
565
to.in.sin_family = (sa_family_t)af;
566
ret = inet_pton(af, ip, &to.in.sin_addr);
567
}
568
if(ret < 0 ){
478
memset(&to, 0, sizeof(to)); /* Spurious warning */
479
to.in6.sin6_family = AF_INET6;
480
/* It would be nice to have a way to detect if we were passed an
481
IPv4 address here. Now we assume an IPv6 address. */
482
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
483
if (ret < 0 ){
569
484
perror("inet_pton");
570
485
return -1;
571
486
}
573
488
fprintf(stderr, "Bad address: %s\n", ip);
574
489
return -1;
575
490
}
576
if(af == AF_INET6){
577
to.in6.sin6_port = htons(port); /* Spurious warnings from
578
-Wconversion and
579
-Wunreachable-code */
580
581
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
582
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
583
-Wunreachable-code*/
584
if(if_index == AVAHI_IF_UNSPEC){
585
fprintf(stderr, "An IPv6 link-local address is incomplete"
586
" without a network interface\n");
587
return -1;
588
}
589
/* Set the network interface number as scope */
590
to.in6.sin6_scope_id = (uint32_t)if_index;
591
}
592
} else {
593
to.in.sin_port = htons(port); /* Spurious warnings from
594
-Wconversion and
595
-Wunreachable-code */
596
}
491
to.in6.sin6_port = htons(port); /* Spurious warning */
492
493
to.in6.sin6_scope_id = (uint32_t)if_index;
597
494
598
495
if(debug){
599
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
600
char interface[IF_NAMESIZE];
601
if(if_indextoname((unsigned int)if_index, interface) == NULL){
602
perror("if_indextoname");
603
} else {
604
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
605
ip, interface, port);
606
}
607
} else {
608
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
609
port);
610
}
611
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
612
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
613
const char *pcret;
614
if(af == AF_INET6){
615
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
616
sizeof(addrstr));
617
} else {
618
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
619
sizeof(addrstr));
620
}
621
if(pcret == NULL){
496
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
497
port);
498
char addrstr[INET6_ADDRSTRLEN] = "";
499
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
500
sizeof(addrstr)) == NULL){
622
501
perror("inet_ntop");
623
502
} else {
624
503
if(strcmp(addrstr, ip) != 0){
627
506
}
628
507
}
629
508
630
if(af == AF_INET6){
631
ret = connect(tcp_sd, &to.in6, sizeof(to));
632
} else {
633
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
634
}
635
if(ret < 0){
509
ret = connect(tcp_sd, &to.in, sizeof(to));
510
if (ret < 0){
636
511
perror("connect");
637
512
return -1;
638
513
}
639
514
640
515
const char *out = mandos_protocol_version;
641
516
written = 0;
642
while(true){
517
while (true){
643
518
size_t out_size = strlen(out);
644
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
645
520
out_size - written));
646
if(ret == -1){
521
if (ret == -1){
647
522
perror("write");
648
523
retval = -1;
649
524
goto mandos_end;
652
527
if(written < out_size){
653
528
continue;
654
529
} else {
655
if(out == mandos_protocol_version){
530
if (out == mandos_protocol_version){
656
531
written = 0;
657
532
out = "\r\n";
658
533
} else {
660
535
}
661
536
}
662
537
}
663
538
664
539
if(debug){
665
540
fprintf(stderr, "Establishing TLS session with %s\n", ip);
666
541
}
667
542
668
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
669
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
670
545
do{
671
ret = gnutls_handshake(session);
546
ret = gnutls_handshake (session);
672
547
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
673
548
674
if(ret != GNUTLS_E_SUCCESS){
549
if (ret != GNUTLS_E_SUCCESS){
675
550
if(debug){
676
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
677
gnutls_perror(ret);
552
gnutls_perror (ret);
678
553
}
679
554
retval = -1;
680
555
goto mandos_end;
683
558
/* Read OpenPGP packet that contains the wanted password */
684
559
685
560
if(debug){
686
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
687
562
ip);
688
563
}
689
564
690
565
while(true){
691
buffer_capacity = incbuffer(&buffer, buffer_length,
566
buffer_capacity = adjustbuffer(&buffer, buffer_length,
692
567
buffer_capacity);
693
if(buffer_capacity == 0){
694
perror("incbuffer");
568
if (buffer_capacity == 0){
569
perror("adjustbuffer");
695
570
retval = -1;
696
571
goto mandos_end;
697
572
}
698
573
699
sret = gnutls_record_recv(session, buffer+buffer_length,
700
BUFFER_SIZE);
701
if(sret == 0){
574
ret = gnutls_record_recv(session, buffer+buffer_length,
575
BUFFER_SIZE);
576
if (ret == 0){
702
577
break;
703
578
}
704
if(sret < 0){
705
switch(sret){
579
if (ret < 0){
580
switch(ret){
706
581
case GNUTLS_E_INTERRUPTED:
707
582
case GNUTLS_E_AGAIN:
708
583
break;
709
584
case GNUTLS_E_REHANDSHAKE:
710
585
do{
711
ret = gnutls_handshake(session);
586
ret = gnutls_handshake (session);
712
587
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
713
if(ret < 0){
588
if (ret < 0){
714
589
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
715
gnutls_perror(ret);
590
gnutls_perror (ret);
716
591
retval = -1;
717
592
goto mandos_end;
718
593
}
721
596
fprintf(stderr, "Unknown error while reading data from"
722
597
" encrypted session with Mandos server\n");
723
598
retval = -1;
724
gnutls_bye(session, GNUTLS_SHUT_RDWR);
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
725
600
goto mandos_end;
726
601
}
727
602
} else {
728
buffer_length += (size_t) sret;
603
buffer_length += (size_t) ret;
729
604
}
730
605
}
731
606
733
608
fprintf(stderr, "Closing TLS session\n");
734
609
}
735
610
736
gnutls_bye(session, GNUTLS_SHUT_RDWR);
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
737
612
738
if(buffer_length > 0){
613
if (buffer_length > 0){
739
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
740
615
buffer_length,
741
&decrypted_buffer);
742
if(decrypted_buffer_size >= 0){
616
&decrypted_buffer,
617
keydir);
618
if (decrypted_buffer_size >= 0){
743
619
written = 0;
744
620
while(written < (size_t) decrypted_buffer_size){
745
ret = (int)fwrite(decrypted_buffer + written, 1,
746
(size_t)decrypted_buffer_size - written,
747
stdout);
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
748
624
if(ret == 0 and ferror(stdout)){
749
625
if(debug){
750
626
fprintf(stderr, "Error writing encrypted data: %s\n",
759
635
} else {
760
636
retval = -1;
761
637
}
762
} else {
763
retval = -1;
764
638
}
765
639
766
640
/* Shutdown procedure */
767
641
768
642
mandos_end:
769
643
free(buffer);
770
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
771
if(ret == -1){
772
perror("close");
773
}
774
gnutls_deinit(session);
644
close(tcp_sd);
645
gnutls_deinit (session);
775
646
return retval;
776
647
}
777
648
778
649
static void resolve_callback(AvahiSServiceResolver *r,
779
650
AvahiIfIndex interface,
780
AvahiProtocol proto,
651
AVAHI_GCC_UNUSED AvahiProtocol protocol,
781
652
AvahiResolverEvent event,
782
653
const char *name,
783
654
const char *type,
788
659
AVAHI_GCC_UNUSED AvahiStringList *txt,
789
660
AVAHI_GCC_UNUSED AvahiLookupResultFlags
790
661
flags,
791
AVAHI_GCC_UNUSED void* userdata){
792
assert(r);
662
void* userdata) {
663
mandos_context *mc = userdata;
664
assert(r); /* Spurious warning */
793
665
794
666
/* Called whenever a service has been resolved successfully or
795
667
timed out */
796
668
797
switch(event){
669
switch (event) {
798
670
default:
799
671
case AVAHI_RESOLVER_FAILURE:
800
672
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
801
673
" of type '%s' in domain '%s': %s\n", name, type, domain,
802
avahi_strerror(avahi_server_errno(mc.server)));
674
avahi_strerror(avahi_server_errno(mc->server)));
803
675
break;
804
676
805
677
case AVAHI_RESOLVER_FOUND:
808
680
avahi_address_snprint(ip, sizeof(ip), address);
809
681
if(debug){
810
682
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
811
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
812
ip, (intmax_t)interface, port);
683
PRIu16 ") on port %d\n", name, host_name, ip,
684
interface, port);
813
685
}
814
int ret = start_mandos_communication(ip, port, interface,
815
avahi_proto_to_af(proto));
816
if(ret == 0){
817
avahi_simple_poll_quit(mc.simple_poll);
686
int ret = start_mandos_communication(ip, port, interface, mc);
687
if (ret == 0){
688
avahi_simple_poll_quit(mc->simple_poll);
818
689
}
819
690
}
820
691
}
821
692
avahi_s_service_resolver_free(r);
822
693
}
823
694
824
static void browse_callback(AvahiSServiceBrowser *b,
825
AvahiIfIndex interface,
826
AvahiProtocol protocol,
827
AvahiBrowserEvent event,
828
const char *name,
829
const char *type,
830
const char *domain,
831
AVAHI_GCC_UNUSED AvahiLookupResultFlags
832
flags,
833
AVAHI_GCC_UNUSED void* userdata){
834
assert(b);
695
static void browse_callback( AvahiSServiceBrowser *b,
696
AvahiIfIndex interface,
697
AvahiProtocol protocol,
698
AvahiBrowserEvent event,
699
const char *name,
700
const char *type,
701
const char *domain,
702
AVAHI_GCC_UNUSED AvahiLookupResultFlags
703
flags,
704
void* userdata) {
705
mandos_context *mc = userdata;
706
assert(b); /* Spurious warning */
835
707
836
708
/* Called whenever a new services becomes available on the LAN or
837
709
is removed from the LAN */
838
710
839
switch(event){
711
switch (event) {
840
712
default:
841
713
case AVAHI_BROWSER_FAILURE:
842
714
843
715
fprintf(stderr, "(Avahi browser) %s\n",
844
avahi_strerror(avahi_server_errno(mc.server)));
845
avahi_simple_poll_quit(mc.simple_poll);
716
avahi_strerror(avahi_server_errno(mc->server)));
717
avahi_simple_poll_quit(mc->simple_poll);
846
718
return;
847
719
848
720
case AVAHI_BROWSER_NEW:
851
723
the callback function is called the Avahi server will free the
852
724
resolver for us. */
853
725
854
if(!(avahi_s_service_resolver_new(mc.server, interface,
726
if (!(avahi_s_service_resolver_new(mc->server, interface,
855
727
protocol, name, type, domain,
856
728
AVAHI_PROTO_INET6, 0,
857
resolve_callback, NULL)))
729
resolve_callback, mc)))
858
730
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
859
name, avahi_strerror(avahi_server_errno(mc.server)));
731
name, avahi_strerror(avahi_server_errno(mc->server)));
860
732
break;
861
733
862
734
case AVAHI_BROWSER_REMOVE:
871
743
}
872
744
}
873
745
874
static void handle_sigterm(__attribute__((unused)) int sig){
875
int old_errno = errno;
876
avahi_simple_poll_quit(mc.simple_poll);
877
errno = old_errno;
746
/* Combines file name and path and returns the malloced new
747
string. some sane checks could/should be added */
748
static char *combinepath(const char *first, const char *second){
749
char *tmp;
750
int ret = asprintf(&tmp, "%s/%s", first, second);
751
if(ret < 0){
752
return NULL;
753
}
754
return tmp;
878
755
}
879
756
757
880
758
int main(int argc, char *argv[]){
881
AvahiSServiceBrowser *sb = NULL;
882
int error;
883
int ret;
884
intmax_t tmpmax;
885
int numchars;
886
int exitcode = EXIT_SUCCESS;
887
const char *interface = "eth0";
888
struct ifreq network;
889
int sd;
890
uid_t uid;
891
gid_t gid;
892
char *connect_to = NULL;
893
char tempdir[] = "/tmp/mandosXXXXXX";
894
bool tempdir_created = false;
895
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
896
const char *seckey = PATHDIR "/" SECKEY;
897
const char *pubkey = PATHDIR "/" PUBKEY;
898
899
/* Initialize Mandos context */
900
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
901
.dh_bits = 1024, .priority = "SECURE256"
902
":!CTYPE-X.509:+CTYPE-OPENPGP" };
903
bool gnutls_initialized = false;
904
bool gpgme_initialized = false;
905
double delay = 2.5;
759
AvahiSServiceBrowser *sb = NULL;
760
int error;
761
int ret;
762
int exitcode = EXIT_SUCCESS;
763
const char *interface = "eth0";
764
struct ifreq network;
765
int sd;
766
uid_t uid;
767
gid_t gid;
768
char *connect_to = NULL;
769
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
770
char *pubkeyfilename = NULL;
771
char *seckeyfilename = NULL;
772
const char *pubkeyname = "pubkey.txt";
773
const char *seckeyname = "seckey.txt";
774
mandos_context mc = { .simple_poll = NULL, .server = NULL,
775
.dh_bits = 1024, .priority = "SECURE256"};
776
bool gnutls_initalized = false;
777
778
{
779
struct argp_option options[] = {
780
{ .name = "debug", .key = 128,
781
.doc = "Debug mode", .group = 3 },
782
{ .name = "connect", .key = 'c',
783
.arg = "IP",
784
.doc = "Connect directly to a sepcified mandos server",
785
.group = 1 },
786
{ .name = "interface", .key = 'i',
787
.arg = "INTERFACE",
788
.doc = "Interface that Avahi will conntect through",
789
.group = 1 },
790
{ .name = "keydir", .key = 'd',
791
.arg = "KEYDIR",
792
.doc = "Directory where the openpgp keyring is",
793
.group = 1 },
794
{ .name = "seckey", .key = 's',
795
.arg = "SECKEY",
796
.doc = "Secret openpgp key for gnutls authentication",
797
.group = 1 },
798
{ .name = "pubkey", .key = 'p',
799
.arg = "PUBKEY",
800
.doc = "Public openpgp key for gnutls authentication",
801
.group = 2 },
802
{ .name = "dh-bits", .key = 129,
803
.arg = "BITS",
804
.doc = "dh-bits to use in gnutls communication",
805
.group = 2 },
806
{ .name = "priority", .key = 130,
807
.arg = "PRIORITY",
808
.doc = "GNUTLS priority", .group = 1 },
809
{ .name = NULL }
810
};
906
811
907
struct sigaction old_sigterm_action;
908
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
909
910
{
911
struct argp_option options[] = {
912
{ .name = "debug", .key = 128,
913
.doc = "Debug mode", .group = 3 },
914
{ .name = "connect", .key = 'c',
915
.arg = "ADDRESS:PORT",
916
.doc = "Connect directly to a specific Mandos server",
917
.group = 1 },
918
{ .name = "interface", .key = 'i',
919
.arg = "NAME",
920
.doc = "Network interface that will be used to search for"
921
" Mandos servers",
922
.group = 1 },
923
{ .name = "seckey", .key = 's',
924
.arg = "FILE",
925
.doc = "OpenPGP secret key file base name",
926
.group = 1 },
927
{ .name = "pubkey", .key = 'p',
928
.arg = "FILE",
929
.doc = "OpenPGP public key file base name",
930
.group = 2 },
931
{ .name = "dh-bits", .key = 129,
932
.arg = "BITS",
933
.doc = "Bit length of the prime number used in the"
934
" Diffie-Hellman key exchange",
935
.group = 2 },
936
{ .name = "priority", .key = 130,
937
.arg = "STRING",
938
.doc = "GnuTLS priority string for the TLS handshake",
939
.group = 1 },
940
{ .name = "delay", .key = 131,
941
.arg = "SECONDS",
942
.doc = "Maximum delay to wait for interface startup",
943
.group = 2 },
944
{ .name = NULL }
945
};
946
947
error_t parse_opt(int key, char *arg,
948
struct argp_state *state){
949
switch(key){
950
case 128: /* --debug */
951
debug = true;
952
break;
953
case 'c': /* --connect */
954
connect_to = arg;
955
break;
956
case 'i': /* --interface */
957
interface = arg;
958
break;
959
case 's': /* --seckey */
960
seckey = arg;
961
break;
962
case 'p': /* --pubkey */
963
pubkey = arg;
964
break;
965
case 129: /* --dh-bits */
966
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
967
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
968
or arg[numchars] != '\0'){
969
fprintf(stderr, "Bad number of DH bits\n");
970
exit(EXIT_FAILURE);
971
}
972
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
973
break;
974
case 130: /* --priority */
975
mc.priority = arg;
976
break;
977
case 131: /* --delay */
978
ret = sscanf(arg, "%lf%n", &delay, &numchars);
979
if(ret < 1 or arg[numchars] != '\0'){
980
fprintf(stderr, "Bad delay\n");
981
exit(EXIT_FAILURE);
982
}
983
break;
984
case ARGP_KEY_ARG:
985
argp_usage(state);
986
case ARGP_KEY_END:
987
break;
988
default:
989
return ARGP_ERR_UNKNOWN;
990
}
991
return 0;
992
}
993
994
struct argp argp = { .options = options, .parser = parse_opt,
995
.args_doc = "",
996
.doc = "Mandos client -- Get and decrypt"
997
" passwords from a Mandos server" };
998
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
999
if(ret == ARGP_ERR_UNKNOWN){
1000
fprintf(stderr, "Unknown error while parsing arguments\n");
1001
exitcode = EXIT_FAILURE;
1002
goto end;
1003
}
1004
}
1005
1006
/* If the interface is down, bring it up */
1007
if(interface[0] != '\0'){
1008
#ifdef __linux__
1009
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1010
messages to mess up the prompt */
1011
ret = klogctl(8, NULL, 5);
1012
bool restore_loglevel = true;
1013
if(ret == -1){
1014
restore_loglevel = false;
1015
perror("klogctl");
1016
}
1017
#endif
1018
1019
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1020
if(sd < 0){
1021
perror("socket");
1022
exitcode = EXIT_FAILURE;
1023
#ifdef __linux__
1024
if(restore_loglevel){
1025
ret = klogctl(7, NULL, 0);
1026
if(ret == -1){
1027
perror("klogctl");
1028
}
1029
}
1030
#endif
1031
goto end;
1032
}
1033
strcpy(network.ifr_name, interface);
1034
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1035
if(ret == -1){
1036
perror("ioctl SIOCGIFFLAGS");
1037
#ifdef __linux__
1038
if(restore_loglevel){
1039
ret = klogctl(7, NULL, 0);
1040
if(ret == -1){
1041
perror("klogctl");
1042
}
1043
}
1044
#endif
1045
exitcode = EXIT_FAILURE;
1046
goto end;
1047
}
1048
if((network.ifr_flags & IFF_UP) == 0){
1049
network.ifr_flags |= IFF_UP;
1050
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1051
if(ret == -1){
1052
perror("ioctl SIOCSIFFLAGS");
1053
exitcode = EXIT_FAILURE;
1054
#ifdef __linux__
1055
if(restore_loglevel){
1056
ret = klogctl(7, NULL, 0);
1057
if(ret == -1){
1058
perror("klogctl");
812
813
error_t parse_opt (int key, char *arg,
814
struct argp_state *state) {
815
/* Get the INPUT argument from `argp_parse', which we know is
816
a pointer to our plugin list pointer. */
817
switch (key) {
818
case 128:
819
debug = true;
820
break;
821
case 'c':
822
connect_to = arg;
823
break;
824
case 'i':
825
interface = arg;
826
break;
827
case 'd':
828
keydir = arg;
829
break;
830
case 's':
831
seckeyname = arg;
832
break;
833
case 'p':
834
pubkeyname = arg;
835
break;
836
case 129:
837
errno = 0;
838
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
839
if (errno){
840
perror("strtol");
841
exit(EXIT_FAILURE);
1059
842
}
843
break;
844
case 130:
845
mc.priority = arg;
846
break;
847
case ARGP_KEY_ARG:
848
argp_usage (state);
849
case ARGP_KEY_END:
850
break;
851
default:
852
return ARGP_ERR_UNKNOWN;
1060
853
}
1061
#endif
1062
goto end;
1063
}
1064
}
1065
/* sleep checking until interface is running */
1066
for(int i=0; i < delay * 4; i++){
854
return 0;
855
}
856
857
struct argp argp = { .options = options, .parser = parse_opt,
858
.args_doc = "",
859
.doc = "Mandos client -- Get and decrypt"
860
" passwords from mandos server" };
861
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
862
if (ret == ARGP_ERR_UNKNOWN){
863
fprintf(stderr, "Unknown error while parsing arguments\n");
864
exitcode = EXIT_FAILURE;
865
goto end;
866
}
867
}
868
869
pubkeyfilename = combinepath(keydir, pubkeyname);
870
if (pubkeyfilename == NULL){
871
perror("combinepath");
872
exitcode = EXIT_FAILURE;
873
goto end;
874
}
875
876
seckeyfilename = combinepath(keydir, seckeyname);
877
if (seckeyfilename == NULL){
878
perror("combinepath");
879
exitcode = EXIT_FAILURE;
880
goto end;
881
}
882
883
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
884
if (ret == -1){
885
fprintf(stderr, "init_gnutls_global failed\n");
886
exitcode = EXIT_FAILURE;
887
goto end;
888
} else {
889
gnutls_initalized = true;
890
}
891
892
/* If the interface is down, bring it up */
893
{
894
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
895
if(sd < 0) {
896
perror("socket");
897
exitcode = EXIT_FAILURE;
898
goto end;
899
}
900
strcpy(network.ifr_name, interface); /* Spurious warning */
1067
901
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1068
902
if(ret == -1){
1069
903
perror("ioctl SIOCGIFFLAGS");
1070
} else if(network.ifr_flags & IFF_RUNNING){
1071
break;
1072
}
1073
struct timespec sleeptime = { .tv_nsec = 250000000 };
1074
ret = nanosleep(&sleeptime, NULL);
1075
if(ret == -1 and errno != EINTR){
1076
perror("nanosleep");
1077
}
1078
}
1079
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1080
if(ret == -1){
1081
perror("close");
1082
}
1083
#ifdef __linux__
1084
if(restore_loglevel){
1085
/* Restores kernel loglevel to default */
1086
ret = klogctl(7, NULL, 0);
1087
if(ret == -1){
1088
perror("klogctl");
1089
}
1090
}
1091
#endif
1092
}
1093
1094
uid = getuid();
1095
gid = getgid();
1096
1097
errno = 0;
1098
setgid(gid);
1099
if(ret == -1){
1100
perror("setgid");
1101
}
1102
1103
ret = setuid(uid);
1104
if(ret == -1){
1105
perror("setuid");
1106
}
1107
1108
ret = init_gnutls_global(pubkey, seckey);
1109
if(ret == -1){
1110
fprintf(stderr, "init_gnutls_global failed\n");
1111
exitcode = EXIT_FAILURE;
1112
goto end;
1113
} else {
1114
gnutls_initialized = true;
1115
}
1116
1117
if(mkdtemp(tempdir) == NULL){
1118
perror("mkdtemp");
1119
goto end;
1120
}
1121
tempdir_created = true;
1122
1123
if(not init_gpgme(pubkey, seckey, tempdir)){
1124
fprintf(stderr, "init_gpgme failed\n");
1125
exitcode = EXIT_FAILURE;
1126
goto end;
1127
} else {
1128
gpgme_initialized = true;
1129
}
1130
1131
if(interface[0] != '\0'){
904
exitcode = EXIT_FAILURE;
905
goto end;
906
}
907
if((network.ifr_flags & IFF_UP) == 0){
908
network.ifr_flags |= IFF_UP;
909
ret = ioctl(sd, SIOCSIFFLAGS, &network);
910
if(ret == -1){
911
perror("ioctl SIOCSIFFLAGS");
912
exitcode = EXIT_FAILURE;
913
goto end;
914
}
915
}
916
close(sd);
917
}
918
919
uid = getuid();
920
gid = getgid();
921
922
ret = setuid(uid);
923
if (ret == -1){
924
perror("setuid");
925
}
926
927
setgid(gid);
928
if (ret == -1){
929
perror("setgid");
930
}
931
1132
932
if_index = (AvahiIfIndex) if_nametoindex(interface);
1133
933
if(if_index == 0){
1134
934
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1135
exitcode = EXIT_FAILURE;
1136
goto end;
1137
}
1138
}
1139
1140
if(connect_to != NULL){
1141
/* Connect directly, do not use Zeroconf */
1142
/* (Mainly meant for debugging) */
1143
char *address = strrchr(connect_to, ':');
1144
if(address == NULL){
1145
fprintf(stderr, "No colon in address\n");
1146
exitcode = EXIT_FAILURE;
1147
goto end;
1148
}
1149
uint16_t port;
1150
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1151
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1152
or address[numchars+1] != '\0'){
1153
fprintf(stderr, "Bad port number\n");
1154
exitcode = EXIT_FAILURE;
1155
goto end;
1156
}
1157
port = (uint16_t)tmpmax;
1158
*address = '\0';
1159
address = connect_to;
1160
/* Colon in address indicates IPv6 */
1161
int af;
1162
if(strchr(address, ':') != NULL){
1163
af = AF_INET6;
1164
} else {
1165
af = AF_INET;
1166
}
1167
ret = start_mandos_communication(address, port, if_index, af);
1168
if(ret < 0){
1169
exitcode = EXIT_FAILURE;
1170
} else {
1171
exitcode = EXIT_SUCCESS;
1172
}
1173
goto end;
1174
}
1175
1176
if(not debug){
1177
avahi_set_log_function(empty_log);
1178
}
1179
1180
/* Initialize the pseudo-RNG for Avahi */
1181
srand((unsigned int) time(NULL));
1182
1183
/* Allocate main Avahi loop object */
1184
mc.simple_poll = avahi_simple_poll_new();
1185
if(mc.simple_poll == NULL){
1186
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1187
exitcode = EXIT_FAILURE;
1188
goto end;
1189
}
1190
1191
{
1192
AvahiServerConfig config;
1193
/* Do not publish any local Zeroconf records */
1194
avahi_server_config_init(&config);
1195
config.publish_hinfo = 0;
1196
config.publish_addresses = 0;
1197
config.publish_workstation = 0;
1198
config.publish_domain = 0;
1199
1200
/* Allocate a new server */
1201
mc.server = avahi_server_new(avahi_simple_poll_get
1202
(mc.simple_poll), &config, NULL,
1203
NULL, &error);
1204
1205
/* Free the Avahi configuration data */
1206
avahi_server_config_free(&config);
1207
}
1208
1209
/* Check if creating the Avahi server object succeeded */
1210
if(mc.server == NULL){
1211
fprintf(stderr, "Failed to create Avahi server: %s\n",
1212
avahi_strerror(error));
1213
exitcode = EXIT_FAILURE;
1214
goto end;
1215
}
1216
1217
/* Create the Avahi service browser */
1218
sb = avahi_s_service_browser_new(mc.server, if_index,
1219
AVAHI_PROTO_INET6, "_mandos._tcp",
1220
NULL, 0, browse_callback, NULL);
1221
if(sb == NULL){
1222
fprintf(stderr, "Failed to create service browser: %s\n",
1223
avahi_strerror(avahi_server_errno(mc.server)));
1224
exitcode = EXIT_FAILURE;
1225
goto end;
1226
}
1227
1228
sigemptyset(&sigterm_action.sa_mask);
1229
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1230
if(ret == -1){
1231
perror("sigaddset");
1232
exitcode = EXIT_FAILURE;
1233
goto end;
1234
}
1235
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1236
if(ret == -1){
1237
perror("sigaction");
1238
exitcode = EXIT_FAILURE;
1239
goto end;
1240
}
1241
1242
/* Run the main loop */
1243
1244
if(debug){
1245
fprintf(stderr, "Starting Avahi loop search\n");
1246
}
1247
1248
avahi_simple_poll_loop(mc.simple_poll);
1249
935
exit(EXIT_FAILURE);
936
}
937
938
if(connect_to != NULL){
939
/* Connect directly, do not use Zeroconf */
940
/* (Mainly meant for debugging) */
941
char *address = strrchr(connect_to, ':');
942
if(address == NULL){
943
fprintf(stderr, "No colon in address\n");
944
exitcode = EXIT_FAILURE;
945
goto end;
946
}
947
errno = 0;
948
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
949
if(errno){
950
perror("Bad port number");
951
exitcode = EXIT_FAILURE;
952
goto end;
953
}
954
*address = '\0';
955
address = connect_to;
956
ret = start_mandos_communication(address, port, if_index, &mc);
957
if(ret < 0){
958
exitcode = EXIT_FAILURE;
959
} else {
960
exitcode = EXIT_SUCCESS;
961
}
962
goto end;
963
}
964
965
if (not debug){
966
avahi_set_log_function(empty_log);
967
}
968
969
/* Initialize the pseudo-RNG for Avahi */
970
srand((unsigned int) time(NULL));
971
972
/* Allocate main Avahi loop object */
973
mc.simple_poll = avahi_simple_poll_new();
974
if (mc.simple_poll == NULL) {
975
fprintf(stderr, "Avahi: Failed to create simple poll"
976
" object.\n");
977
exitcode = EXIT_FAILURE;
978
goto end;
979
}
980
981
{
982
AvahiServerConfig config;
983
/* Do not publish any local Zeroconf records */
984
avahi_server_config_init(&config);
985
config.publish_hinfo = 0;
986
config.publish_addresses = 0;
987
config.publish_workstation = 0;
988
config.publish_domain = 0;
989
990
/* Allocate a new server */
991
mc.server = avahi_server_new(avahi_simple_poll_get
992
(mc.simple_poll), &config, NULL,
993
NULL, &error);
994
995
/* Free the Avahi configuration data */
996
avahi_server_config_free(&config);
997
}
998
999
/* Check if creating the Avahi server object succeeded */
1000
if (mc.server == NULL) {
1001
fprintf(stderr, "Failed to create Avahi server: %s\n",
1002
avahi_strerror(error));
1003
exitcode = EXIT_FAILURE;
1004
goto end;
1005
}
1006
1007
/* Create the Avahi service browser */
1008
sb = avahi_s_service_browser_new(mc.server, if_index,
1009
AVAHI_PROTO_INET6,
1010
"_mandos._tcp", NULL, 0,
1011
browse_callback, &mc);
1012
if (sb == NULL) {
1013
fprintf(stderr, "Failed to create service browser: %s\n",
1014
avahi_strerror(avahi_server_errno(mc.server)));
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1017
}
1018
1019
/* Run the main loop */
1020
1021
if (debug){
1022
fprintf(stderr, "Starting Avahi loop search\n");
1023
}
1024
1025
avahi_simple_poll_loop(mc.simple_poll);
1026
1250
1027
end:
1251
1252
if(debug){
1253
fprintf(stderr, "%s exiting\n", argv[0]);
1254
}
1255
1256
/* Cleanup things */
1257
if(sb != NULL)
1258
avahi_s_service_browser_free(sb);
1259
1260
if(mc.server != NULL)
1261
avahi_server_free(mc.server);
1262
1263
if(mc.simple_poll != NULL)
1264
avahi_simple_poll_free(mc.simple_poll);
1265
1266
if(gnutls_initialized){
1267
gnutls_certificate_free_credentials(mc.cred);
1268
gnutls_global_deinit();
1269
gnutls_dh_params_deinit(mc.dh_params);
1270
}
1271
1272
if(gpgme_initialized){
1273
gpgme_release(mc.ctx);
1274
}
1275
1276
/* Removes the temp directory used by GPGME */
1277
if(tempdir_created){
1278
DIR *d;
1279
struct dirent *direntry;
1280
d = opendir(tempdir);
1281
if(d == NULL){
1282
if(errno != ENOENT){
1283
perror("opendir");
1284
}
1285
} else {
1286
while(true){
1287
direntry = readdir(d);
1288
if(direntry == NULL){
1289
break;
1290
}
1291
/* Skip "." and ".." */
1292
if(direntry->d_name[0] == '.'
1293
and (direntry->d_name[1] == '\0'
1294
or (direntry->d_name[1] == '.'
1295
and direntry->d_name[2] == '\0'))){
1296
continue;
1297
}
1298
char *fullname = NULL;
1299
ret = asprintf(&fullname, "%s/%s", tempdir,
1300
direntry->d_name);
1301
if(ret < 0){
1302
perror("asprintf");
1303
continue;
1304
}
1305
ret = remove(fullname);
1306
if(ret == -1){
1307
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1308
strerror(errno));
1309
}
1310
free(fullname);
1311
}
1312
closedir(d);
1313
}
1314
ret = rmdir(tempdir);
1315
if(ret == -1 and errno != ENOENT){
1316
perror("rmdir");
1317
}
1318
}
1319
1320
return exitcode;
1028
1029
if (debug){
1030
fprintf(stderr, "%s exiting\n", argv[0]);
1031
}
1032
1033
/* Cleanup things */
1034
if (sb != NULL)
1035
avahi_s_service_browser_free(sb);
1036
1037
if (mc.server != NULL)
1038
avahi_server_free(mc.server);
1039
1040
if (mc.simple_poll != NULL)
1041
avahi_simple_poll_free(mc.simple_poll);
1042
free(pubkeyfilename);
1043
free(seckeyfilename);
1044
1045
if (gnutls_initalized){
1046
gnutls_certificate_free_credentials(mc.cred);
1047
gnutls_global_deinit ();
1048
}
1049
1050
return exitcode;
1321
1051
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0