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- Committer: Teddy Hogeborn
- Date: 2008-08-18 23:55:28 UTC
- Revision ID: teddy@fukt.bsnet.se-20080818235528-dn628nlbrtzl7z4f
* Makefile: Bug fix: fixed creation of man pages for section 5 pages.
* mandos (main): Changed from requiring "[server]" in mandos.conf(5)
to requiring "[DEFAULT]".
* mandos.conf ([server]): Renamed to "[DEFAULT]".
* mandos.conf.xml: Removed <?xml-stylesheet>. New entity "&OVERVIEW;"
referring to "overview.xml".
(DESCRIPTION): Updated to specify the syntax more precisely. Use
<varname> around the option names.
* mandos (main): Changed from requiring "[server]" in mandos.conf(5)
to requiring "[DEFAULT]".
* mandos.conf ([server]): Renamed to "[DEFAULT]".
* mandos.conf.xml: Removed <?xml-stylesheet>. New entity "&OVERVIEW;"
referring to "overview.xml".
(DESCRIPTION): Updated to specify the syntax more precisely. Use
<varname> around the option names.
- 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
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 */
56
#include <sys/stat.h> /* open() */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
57
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
53
struct in6_addr, inet_pton(),
54
connect() */
64
55
#include <assert.h> /* assert() */
65
56
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
57
#include <time.h> /* time() */
67
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
59
SIOCSIFFLAGS, if_indextoname(),
69
60
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
62
getuid(), getgid(), setuid(),
75
63
setgid() */
64
#include <netinet/in.h>
76
65
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
66
#include <iso646.h> /* not, and */
78
67
#include <argp.h> /* struct argp_option, error_t, struct
79
68
argp_state, struct argp,
80
69
argp_parse(), ARGP_KEY_ARG,
81
70
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
71
90
72
/* Avahi */
91
73
/* All Avahi types, constants and functions
104
86
gnutls_*
105
87
init_gnutls_session(),
106
88
GNUTLS_* */
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
109
90
GNUTLS_OPENPGP_FMT_BASE64 */
110
91
111
92
/* GPGME */
117
98
118
99
#define BUFFER_SIZE 256
119
100
120
#define PATHDIR "/conf/conf.d/mandos"
121
#define SECKEY "seckey.txt"
122
#define PUBKEY "pubkey.txt"
123
124
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
125
103
static const char mandos_protocol_version[] = "1";
126
const char *argp_program_version = "mandos-client " VERSION;
104
const char *argp_program_version = "password-request 1.0";
127
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
128
106
129
107
/* Used for passing in values through the Avahi callback functions */
134
112
unsigned int dh_bits;
135
113
gnutls_dh_params_t dh_params;
136
114
const char *priority;
137
gpgme_ctx_t ctx;
138
115
} mandos_context;
139
116
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
117
/*
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
148
120
* "buffer_length" is how much is already used.
149
121
*/
150
size_t incbuffer(char **buffer, size_t buffer_length,
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
151
123
size_t buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
153
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
126
if (buffer == NULL){
155
127
return 0;
156
128
}
157
129
buffer_capacity += BUFFER_SIZE;
160
132
}
161
133
162
134
/*
163
* Initialize GPGME.
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
164
137
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
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;
168
144
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
169
148
gpgme_engine_info_t engine_info;
170
149
171
172
/*
173
* Helper function to insert pub and seckey to the engine keyring.
174
*/
175
bool import_key(const char *filename){
176
int fd;
177
gpgme_data_t pgp_data;
178
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
if(fd == -1){
181
perror("open");
182
return false;
183
}
184
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
189
return false;
190
}
191
192
rc = gpgme_op_import(mc.ctx, pgp_data);
193
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
196
return false;
197
}
198
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
200
if(ret == -1){
201
perror("close");
202
}
203
gpgme_data_release(pgp_data);
204
return true;
205
}
206
207
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
209
152
}
210
153
211
154
/* Init GPGME */
212
155
gpgme_check_version(NULL);
213
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
if(rc != GPG_ERR_NO_ERROR){
157
if (rc != GPG_ERR_NO_ERROR){
215
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
159
gpgme_strsource(rc), gpgme_strerror(rc));
217
return false;
160
return -1;
218
161
}
219
162
220
/* Set GPGME home directory for the OpenPGP engine only */
221
rc = gpgme_get_engine_info(&engine_info);
222
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){
223
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
167
gpgme_strsource(rc), gpgme_strerror(rc));
225
return false;
168
return -1;
226
169
}
227
170
while(engine_info != NULL){
228
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
229
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
230
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
231
174
break;
232
175
}
233
176
engine_info = engine_info->next;
234
177
}
235
178
if(engine_info == NULL){
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
237
return false;
238
}
239
240
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
242
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
245
return false;
246
}
247
248
if(not import_key(pubkey) or not import_key(seckey)){
249
return false;
250
}
251
252
return true;
253
}
254
255
/*
256
* Decrypt OpenPGP data.
257
* Returns -1 on error
258
*/
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
size_t crypto_size,
261
char **plaintext){
262
gpgme_data_t dh_crypto, dh_plain;
263
gpgme_error_t rc;
264
ssize_t ret;
265
size_t plaintext_capacity = 0;
266
ssize_t plaintext_length = 0;
267
268
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
270
181
}
271
182
272
183
/* Create new GPGME data buffer from memory cryptotext */
273
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
185
0);
275
if(rc != GPG_ERR_NO_ERROR){
186
if (rc != GPG_ERR_NO_ERROR){
276
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
188
gpgme_strsource(rc), gpgme_strerror(rc));
278
189
return -1;
280
191
281
192
/* Create new empty GPGME data buffer for the plaintext */
282
193
rc = gpgme_data_new(&dh_plain);
283
if(rc != GPG_ERR_NO_ERROR){
194
if (rc != GPG_ERR_NO_ERROR){
284
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
196
gpgme_strsource(rc), gpgme_strerror(rc));
286
197
gpgme_data_release(dh_crypto);
287
198
return -1;
288
199
}
289
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
290
210
/* Decrypt data from the cryptotext data buffer to the plaintext
291
211
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
294
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
215
gpgme_strsource(rc), gpgme_strerror(rc));
296
216
plaintext_length = -1;
297
if(debug){
298
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
300
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
302
} else {
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
307
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
309
}
310
gpgme_recipient_t recipient;
311
recipient = result->recipients;
217
goto decrypt_end;
218
}
219
220
if(debug){
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
222
}
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){
312
240
while(recipient != NULL){
313
241
fprintf(stderr, "Public key algorithm: %s\n",
314
242
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
248
}
321
249
}
322
250
}
323
goto decrypt_end;
324
}
325
326
if(debug){
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
328
251
}
329
252
330
253
/* Seek back to the beginning of the GPGME plaintext data buffer */
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
332
perror("gpgme_data_seek");
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
333
256
plaintext_length = -1;
334
257
goto decrypt_end;
335
258
}
336
259
337
260
*plaintext = NULL;
338
261
while(true){
339
plaintext_capacity = incbuffer(plaintext,
262
plaintext_capacity = adjustbuffer(plaintext,
340
263
(size_t)plaintext_length,
341
264
plaintext_capacity);
342
if(plaintext_capacity == 0){
343
perror("incbuffer");
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
344
267
plaintext_length = -1;
345
268
goto decrypt_end;
346
269
}
348
271
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
349
272
BUFFER_SIZE);
350
273
/* Print the data, if any */
351
if(ret == 0){
274
if (ret == 0){
352
275
/* EOF */
353
276
break;
354
277
}
359
282
}
360
283
plaintext_length += ret;
361
284
}
362
285
363
286
if(debug){
364
287
fprintf(stderr, "Decrypted password is: ");
365
288
for(ssize_t i = 0; i < plaintext_length; i++){
378
301
return plaintext_length;
379
302
}
380
303
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)
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value); /* Spurious warning */
306
if (ret == NULL)
385
307
ret = "(unknown)";
386
308
return ret;
387
309
}
392
314
fprintf(stderr, "GnuTLS: %s", string);
393
315
}
394
316
395
static int init_gnutls_global(const char *pubkeyfilename,
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfilename,
396
319
const char *seckeyfilename){
397
320
int ret;
398
321
401
324
}
402
325
403
326
ret = gnutls_global_init();
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
407
330
return -1;
408
331
}
409
332
410
if(debug){
333
if (debug){
411
334
/* "Use a log level over 10 to enable all debugging options."
412
335
* - GnuTLS manual
413
336
*/
416
339
}
417
340
418
341
/* 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();
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
345
warning */
346
safer_gnutls_strerror(ret));
347
gnutls_global_deinit ();
427
348
return -1;
428
349
}
429
350
430
351
if(debug){
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
352
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
353
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
433
354
seckeyfilename);
434
355
}
435
356
436
357
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
358
(mc->cred, pubkeyfilename, seckeyfilename,
438
359
GNUTLS_OPENPGP_FMT_BASE64);
439
if(ret != GNUTLS_E_SUCCESS){
360
if (ret != GNUTLS_E_SUCCESS) {
440
361
fprintf(stderr,
441
362
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
363
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
364
fprintf(stdout, "The GnuTLS error is: %s\n",
444
365
safer_gnutls_strerror(ret));
445
366
goto globalfail;
446
367
}
447
368
448
369
/* 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));
453
goto globalfail;
454
}
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));
459
goto globalfail;
460
}
461
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
463
370
ret = gnutls_dh_params_init(&mc->dh_params);
371
if (ret != GNUTLS_E_SUCCESS) {
372
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
373
" %s\n", safer_gnutls_strerror(ret));
374
goto globalfail;
375
}
376
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
377
if (ret != GNUTLS_E_SUCCESS) {
378
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
379
safer_gnutls_strerror(ret));
380
goto globalfail;
381
}
382
383
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
384
464
385
return 0;
465
386
466
387
globalfail:
467
468
gnutls_certificate_free_credentials(mc.cred);
388
389
gnutls_certificate_free_credentials(mc->cred);
469
390
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
471
391
return -1;
392
472
393
}
473
394
474
static int init_gnutls_session(gnutls_session_t *session){
395
static int init_gnutls_session(mandos_context *mc,
396
gnutls_session_t *session){
475
397
int ret;
476
398
/* GnuTLS session creation */
477
399
ret = gnutls_init(session, GNUTLS_SERVER);
478
if(ret != GNUTLS_E_SUCCESS){
400
if (ret != GNUTLS_E_SUCCESS){
479
401
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
402
safer_gnutls_strerror(ret));
481
403
}
482
404
483
405
{
484
406
const char *err;
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
486
if(ret != GNUTLS_E_SUCCESS){
407
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
408
if (ret != GNUTLS_E_SUCCESS) {
487
409
fprintf(stderr, "Syntax error at: %s\n", err);
488
410
fprintf(stderr, "GnuTLS error: %s\n",
489
411
safer_gnutls_strerror(ret));
490
gnutls_deinit(*session);
412
gnutls_deinit (*session);
491
413
return -1;
492
414
}
493
415
}
494
416
495
417
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
497
if(ret != GNUTLS_E_SUCCESS){
418
mc->cred);
419
if (ret != GNUTLS_E_SUCCESS) {
498
420
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
421
safer_gnutls_strerror(ret));
500
gnutls_deinit(*session);
422
gnutls_deinit (*session);
501
423
return -1;
502
424
}
503
425
504
426
/* ignore client certificate if any. */
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
427
gnutls_certificate_server_set_request (*session,
428
GNUTLS_CERT_IGNORE);
507
429
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
430
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
509
431
510
432
return 0;
511
433
}
514
436
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
515
437
__attribute__((unused)) const char *txt){}
516
438
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
520
439
/* Called when a Mandos server is found */
521
440
static int start_mandos_communication(const char *ip, uint16_t port,
522
441
AvahiIfIndex if_index,
523
int af){
442
mandos_context *mc){
524
443
int ret, tcp_sd;
525
ssize_t sret;
526
union {
527
struct sockaddr_in in;
528
struct sockaddr_in6 in6;
529
} to;
444
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
530
445
char *buffer = NULL;
531
446
char *decrypted_buffer;
532
447
size_t buffer_length = 0;
534
449
ssize_t decrypted_buffer_size;
535
450
size_t written;
536
451
int retval = 0;
452
char interface[IF_NAMESIZE];
537
453
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){
454
455
ret = init_gnutls_session (mc, &session);
456
if (ret != 0){
554
457
return -1;
555
458
}
556
459
557
460
if(debug){
558
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
461
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
559
462
"\n", ip, port);
560
463
}
561
464
562
tcp_sd = socket(pf, SOCK_STREAM, 0);
563
if(tcp_sd < 0){
465
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
466
if(tcp_sd < 0) {
564
467
perror("socket");
565
468
return -1;
566
469
}
470
471
if(debug){
472
if(if_indextoname((unsigned int)if_index, interface) == NULL){
473
perror("if_indextoname");
474
return -1;
475
}
476
fprintf(stderr, "Binding to interface %s\n", interface);
477
}
567
478
568
479
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 ){
480
to.in6.sin6_family = AF_INET6;
481
/* It would be nice to have a way to detect if we were passed an
482
IPv4 address here. Now we assume an IPv6 address. */
483
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
484
if (ret < 0 ){
577
485
perror("inet_pton");
578
486
return -1;
579
487
}
581
489
fprintf(stderr, "Bad address: %s\n", ip);
582
490
return -1;
583
491
}
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
}
492
to.in6.sin6_port = htons(port); /* Spurious warning */
493
494
to.in6.sin6_scope_id = (uint32_t)if_index;
605
495
606
496
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){
497
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
498
port);
499
char addrstr[INET6_ADDRSTRLEN] = "";
500
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
501
sizeof(addrstr)) == NULL){
630
502
perror("inet_ntop");
631
503
} else {
632
504
if(strcmp(addrstr, ip) != 0){
635
507
}
636
508
}
637
509
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){
510
ret = connect(tcp_sd, &to.in, sizeof(to));
511
if (ret < 0){
644
512
perror("connect");
645
513
return -1;
646
514
}
647
515
648
516
const char *out = mandos_protocol_version;
649
517
written = 0;
650
while(true){
518
while (true){
651
519
size_t out_size = strlen(out);
652
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
520
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
653
521
out_size - written));
654
if(ret == -1){
522
if (ret == -1){
655
523
perror("write");
656
524
retval = -1;
657
525
goto mandos_end;
660
528
if(written < out_size){
661
529
continue;
662
530
} else {
663
if(out == mandos_protocol_version){
531
if (out == mandos_protocol_version){
664
532
written = 0;
665
533
out = "\r\n";
666
534
} else {
668
536
}
669
537
}
670
538
}
671
539
672
540
if(debug){
673
541
fprintf(stderr, "Establishing TLS session with %s\n", ip);
674
542
}
675
543
676
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
677
544
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
545
678
546
do{
679
ret = gnutls_handshake(session);
547
ret = gnutls_handshake (session);
680
548
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
681
549
682
if(ret != GNUTLS_E_SUCCESS){
550
if (ret != GNUTLS_E_SUCCESS){
683
551
if(debug){
684
552
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
685
gnutls_perror(ret);
553
gnutls_perror (ret);
686
554
}
687
555
retval = -1;
688
556
goto mandos_end;
691
559
/* Read OpenPGP packet that contains the wanted password */
692
560
693
561
if(debug){
694
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
562
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
695
563
ip);
696
564
}
697
565
698
566
while(true){
699
buffer_capacity = incbuffer(&buffer, buffer_length,
567
buffer_capacity = adjustbuffer(&buffer, buffer_length,
700
568
buffer_capacity);
701
if(buffer_capacity == 0){
702
perror("incbuffer");
569
if (buffer_capacity == 0){
570
perror("adjustbuffer");
703
571
retval = -1;
704
572
goto mandos_end;
705
573
}
706
574
707
sret = gnutls_record_recv(session, buffer+buffer_length,
708
BUFFER_SIZE);
709
if(sret == 0){
575
ret = gnutls_record_recv(session, buffer+buffer_length,
576
BUFFER_SIZE);
577
if (ret == 0){
710
578
break;
711
579
}
712
if(sret < 0){
713
switch(sret){
580
if (ret < 0){
581
switch(ret){
714
582
case GNUTLS_E_INTERRUPTED:
715
583
case GNUTLS_E_AGAIN:
716
584
break;
717
585
case GNUTLS_E_REHANDSHAKE:
718
586
do{
719
ret = gnutls_handshake(session);
587
ret = gnutls_handshake (session);
720
588
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
721
if(ret < 0){
589
if (ret < 0){
722
590
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
723
gnutls_perror(ret);
591
gnutls_perror (ret);
724
592
retval = -1;
725
593
goto mandos_end;
726
594
}
729
597
fprintf(stderr, "Unknown error while reading data from"
730
598
" encrypted session with Mandos server\n");
731
599
retval = -1;
732
gnutls_bye(session, GNUTLS_SHUT_RDWR);
600
gnutls_bye (session, GNUTLS_SHUT_RDWR);
733
601
goto mandos_end;
734
602
}
735
603
} else {
736
buffer_length += (size_t) sret;
604
buffer_length += (size_t) ret;
737
605
}
738
606
}
739
607
741
609
fprintf(stderr, "Closing TLS session\n");
742
610
}
743
611
744
gnutls_bye(session, GNUTLS_SHUT_RDWR);
612
gnutls_bye (session, GNUTLS_SHUT_RDWR);
745
613
746
if(buffer_length > 0){
614
if (buffer_length > 0){
747
615
decrypted_buffer_size = pgp_packet_decrypt(buffer,
748
616
buffer_length,
749
&decrypted_buffer);
750
if(decrypted_buffer_size >= 0){
617
&decrypted_buffer,
618
keydir);
619
if (decrypted_buffer_size >= 0){
751
620
written = 0;
752
621
while(written < (size_t) decrypted_buffer_size){
753
ret = (int)fwrite(decrypted_buffer + written, 1,
754
(size_t)decrypted_buffer_size - written,
755
stdout);
622
ret = (int)fwrite (decrypted_buffer + written, 1,
623
(size_t)decrypted_buffer_size - written,
624
stdout);
756
625
if(ret == 0 and ferror(stdout)){
757
626
if(debug){
758
627
fprintf(stderr, "Error writing encrypted data: %s\n",
767
636
} else {
768
637
retval = -1;
769
638
}
770
} else {
771
retval = -1;
772
639
}
773
640
774
641
/* Shutdown procedure */
775
642
776
643
mandos_end:
777
644
free(buffer);
778
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
779
if(ret == -1){
780
perror("close");
781
}
782
gnutls_deinit(session);
645
close(tcp_sd);
646
gnutls_deinit (session);
783
647
return retval;
784
648
}
785
649
786
650
static void resolve_callback(AvahiSServiceResolver *r,
787
651
AvahiIfIndex interface,
788
AvahiProtocol proto,
652
AVAHI_GCC_UNUSED AvahiProtocol protocol,
789
653
AvahiResolverEvent event,
790
654
const char *name,
791
655
const char *type,
796
660
AVAHI_GCC_UNUSED AvahiStringList *txt,
797
661
AVAHI_GCC_UNUSED AvahiLookupResultFlags
798
662
flags,
799
AVAHI_GCC_UNUSED void* userdata){
663
void* userdata) {
664
mandos_context *mc = userdata;
800
665
assert(r);
801
666
802
667
/* Called whenever a service has been resolved successfully or
803
668
timed out */
804
669
805
if(quit_now){
806
return;
807
}
808
809
switch(event){
670
switch (event) {
810
671
default:
811
672
case AVAHI_RESOLVER_FAILURE:
812
673
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
813
674
" of type '%s' in domain '%s': %s\n", name, type, domain,
814
avahi_strerror(avahi_server_errno(mc.server)));
675
avahi_strerror(avahi_server_errno(mc->server)));
815
676
break;
816
677
817
678
case AVAHI_RESOLVER_FOUND:
820
681
avahi_address_snprint(ip, sizeof(ip), address);
821
682
if(debug){
822
683
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
823
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
824
ip, (intmax_t)interface, port);
684
PRIu16 ") on port %d\n", name, host_name, ip,
685
interface, port);
825
686
}
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);
687
int ret = start_mandos_communication(ip, port, interface, mc);
688
if (ret == 0){
689
avahi_simple_poll_quit(mc->simple_poll);
830
690
}
831
691
}
832
692
}
833
693
avahi_s_service_resolver_free(r);
834
694
}
835
695
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){
696
static void browse_callback( AvahiSServiceBrowser *b,
697
AvahiIfIndex interface,
698
AvahiProtocol protocol,
699
AvahiBrowserEvent event,
700
const char *name,
701
const char *type,
702
const char *domain,
703
AVAHI_GCC_UNUSED AvahiLookupResultFlags
704
flags,
705
void* userdata) {
706
mandos_context *mc = userdata;
846
707
assert(b);
847
708
848
709
/* Called whenever a new services becomes available on the LAN or
849
710
is removed from the LAN */
850
711
851
switch(event){
712
switch (event) {
852
713
default:
853
714
case AVAHI_BROWSER_FAILURE:
854
715
855
716
fprintf(stderr, "(Avahi browser) %s\n",
856
avahi_strerror(avahi_server_errno(mc.server)));
857
avahi_simple_poll_quit(mc.simple_poll);
717
avahi_strerror(avahi_server_errno(mc->server)));
718
avahi_simple_poll_quit(mc->simple_poll);
858
719
return;
859
720
860
721
case AVAHI_BROWSER_NEW:
863
724
the callback function is called the Avahi server will free the
864
725
resolver for us. */
865
726
866
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
867
name, type, domain, protocol, 0,
868
resolve_callback, NULL) == NULL)
727
if (!(avahi_s_service_resolver_new(mc->server, interface,
728
protocol, name, type, domain,
729
AVAHI_PROTO_INET6, 0,
730
resolve_callback, mc)))
869
731
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
870
name, avahi_strerror(avahi_server_errno(mc.server)));
732
name, avahi_strerror(avahi_server_errno(mc->server)));
871
733
break;
872
734
873
735
case AVAHI_BROWSER_REMOVE:
882
744
}
883
745
}
884
746
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;
747
/* Combines file name and path and returns the malloced new
748
string. some sane checks could/should be added */
749
static char *combinepath(const char *first, const char *second){
750
char *tmp;
751
int ret = asprintf(&tmp, "%s/%s", first, second);
752
if(ret < 0){
753
return NULL;
754
}
755
return tmp;
897
756
}
898
757
758
899
759
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'){
760
AvahiSServiceBrowser *sb = NULL;
761
int error;
762
int ret;
763
int exitcode = EXIT_SUCCESS;
764
const char *interface = "eth0";
765
struct ifreq network;
766
int sd;
767
uid_t uid;
768
gid_t gid;
769
char *connect_to = NULL;
770
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
771
char *pubkeyfilename = NULL;
772
char *seckeyfilename = NULL;
773
const char *pubkeyname = "pubkey.txt";
774
const char *seckeyname = "seckey.txt";
775
mandos_context mc = { .simple_poll = NULL, .server = NULL,
776
.dh_bits = 1024, .priority = "SECURE256"};
777
bool gnutls_initalized = false;
778
779
{
780
struct argp_option options[] = {
781
{ .name = "debug", .key = 128,
782
.doc = "Debug mode", .group = 3 },
783
{ .name = "connect", .key = 'c',
784
.arg = "IP",
785
.doc = "Connect directly to a sepcified mandos server",
786
.group = 1 },
787
{ .name = "interface", .key = 'i',
788
.arg = "INTERFACE",
789
.doc = "Interface that Avahi will conntect through",
790
.group = 1 },
791
{ .name = "keydir", .key = 'd',
792
.arg = "KEYDIR",
793
.doc = "Directory where the openpgp keyring is",
794
.group = 1 },
795
{ .name = "seckey", .key = 's',
796
.arg = "SECKEY",
797
.doc = "Secret openpgp key for gnutls authentication",
798
.group = 1 },
799
{ .name = "pubkey", .key = 'p',
800
.arg = "PUBKEY",
801
.doc = "Public openpgp key for gnutls authentication",
802
.group = 2 },
803
{ .name = "dh-bits", .key = 129,
804
.arg = "BITS",
805
.doc = "dh-bits to use in gnutls communication",
806
.group = 2 },
807
{ .name = "priority", .key = 130,
808
.arg = "PRIORITY",
809
.doc = "GNUTLS priority", .group = 1 },
810
{ .name = NULL }
811
};
812
813
814
error_t parse_opt (int key, char *arg,
815
struct argp_state *state) {
816
/* Get the INPUT argument from `argp_parse', which we know is
817
a pointer to our plugin list pointer. */
818
switch (key) {
819
case 128:
820
debug = true;
821
break;
822
case 'c':
823
connect_to = arg;
824
break;
825
case 'i':
826
interface = arg;
827
break;
828
case 'd':
829
keydir = arg;
830
break;
831
case 's':
832
seckeyname = arg;
833
break;
834
case 'p':
835
pubkeyname = arg;
836
break;
837
case 129:
838
errno = 0;
839
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
840
if (errno){
841
perror("strtol");
842
exit(EXIT_FAILURE);
843
}
844
break;
845
case 130:
846
mc.priority = arg;
847
break;
848
case ARGP_KEY_ARG:
849
argp_usage (state);
850
case ARGP_KEY_END:
851
break;
852
default:
853
return ARGP_ERR_UNKNOWN;
854
}
855
return 0;
856
}
857
858
struct argp argp = { .options = options, .parser = parse_opt,
859
.args_doc = "",
860
.doc = "Mandos client -- Get and decrypt"
861
" passwords from mandos server" };
862
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
863
if (ret == ARGP_ERR_UNKNOWN){
864
fprintf(stderr, "Unknown error while parsing arguments\n");
865
exitcode = EXIT_FAILURE;
866
goto end;
867
}
868
}
869
870
pubkeyfilename = combinepath(keydir, pubkeyname);
871
if (pubkeyfilename == NULL){
872
perror("combinepath");
873
exitcode = EXIT_FAILURE;
874
goto end;
875
}
876
877
seckeyfilename = combinepath(keydir, seckeyname);
878
if (seckeyfilename == NULL){
879
perror("combinepath");
880
exitcode = EXIT_FAILURE;
881
goto end;
882
}
883
884
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
885
if (ret == -1){
886
fprintf(stderr, "init_gnutls_global failed\n");
887
exitcode = EXIT_FAILURE;
888
goto end;
889
} else {
890
gnutls_initalized = true;
891
}
892
893
/* If the interface is down, bring it up */
894
{
895
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
896
if(sd < 0) {
897
perror("socket");
898
exitcode = EXIT_FAILURE;
899
goto end;
900
}
901
strcpy(network.ifr_name, interface);
902
ret = ioctl(sd, SIOCGIFFLAGS, &network);
903
if(ret == -1){
904
perror("ioctl SIOCGIFFLAGS");
905
exitcode = EXIT_FAILURE;
906
goto end;
907
}
908
if((network.ifr_flags & IFF_UP) == 0){
909
network.ifr_flags |= IFF_UP;
910
ret = ioctl(sd, SIOCSIFFLAGS, &network);
911
if(ret == -1){
912
perror("ioctl SIOCSIFFLAGS");
913
exitcode = EXIT_FAILURE;
914
goto end;
915
}
916
}
917
close(sd);
918
}
919
920
uid = getuid();
921
gid = getgid();
922
923
ret = setuid(uid);
924
if (ret == -1){
925
perror("setuid");
926
}
927
928
setgid(gid);
929
if (ret == -1){
930
perror("setgid");
931
}
932
1104
933
if_index = (AvahiIfIndex) if_nametoindex(interface);
1105
934
if(if_index == 0){
1106
935
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
936
exit(EXIT_FAILURE);
937
}
938
939
if(connect_to != NULL){
940
/* Connect directly, do not use Zeroconf */
941
/* (Mainly meant for debugging) */
942
char *address = strrchr(connect_to, ':');
943
if(address == NULL){
944
fprintf(stderr, "No colon in address\n");
945
exitcode = EXIT_FAILURE;
946
goto end;
947
}
948
errno = 0;
949
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
950
if(errno){
951
perror("Bad port number");
952
exitcode = EXIT_FAILURE;
953
goto end;
954
}
955
*address = '\0';
956
address = connect_to;
957
ret = start_mandos_communication(address, port, if_index, &mc);
958
if(ret < 0){
959
exitcode = EXIT_FAILURE;
960
} else {
961
exitcode = EXIT_SUCCESS;
962
}
963
goto end;
964
}
965
966
if (not debug){
967
avahi_set_log_function(empty_log);
968
}
969
970
/* Initialize the pseudo-RNG for Avahi */
971
srand((unsigned int) time(NULL));
972
973
/* Allocate main Avahi loop object */
974
mc.simple_poll = avahi_simple_poll_new();
975
if (mc.simple_poll == NULL) {
976
fprintf(stderr, "Avahi: Failed to create simple poll"
977
" object.\n");
978
exitcode = EXIT_FAILURE;
979
goto end;
980
}
981
982
{
983
AvahiServerConfig config;
984
/* Do not publish any local Zeroconf records */
985
avahi_server_config_init(&config);
986
config.publish_hinfo = 0;
987
config.publish_addresses = 0;
988
config.publish_workstation = 0;
989
config.publish_domain = 0;
990
991
/* Allocate a new server */
992
mc.server = avahi_server_new(avahi_simple_poll_get
993
(mc.simple_poll), &config, NULL,
994
NULL, &error);
995
996
/* Free the Avahi configuration data */
997
avahi_server_config_free(&config);
998
}
999
1000
/* Check if creating the Avahi server object succeeded */
1001
if (mc.server == NULL) {
1002
fprintf(stderr, "Failed to create Avahi server: %s\n",
1003
avahi_strerror(error));
1004
exitcode = EXIT_FAILURE;
1005
goto end;
1006
}
1007
1008
/* Create the Avahi service browser */
1009
sb = avahi_s_service_browser_new(mc.server, if_index,
1010
AVAHI_PROTO_INET6,
1011
"_mandos._tcp", NULL, 0,
1012
browse_callback, &mc);
1013
if (sb == NULL) {
1014
fprintf(stderr, "Failed to create service browser: %s\n",
1015
avahi_strerror(avahi_server_errno(mc.server)));
1016
exitcode = EXIT_FAILURE;
1017
goto end;
1018
}
1019
1020
/* Run the main loop */
1021
1022
if (debug){
1023
fprintf(stderr, "Starting Avahi loop search\n");
1024
}
1025
1026
avahi_simple_poll_loop(mc.simple_poll);
1027
1373
1028
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){
1424
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;
1029
1030
if (debug){
1031
fprintf(stderr, "%s exiting\n", argv[0]);
1032
}
1033
1034
/* Cleanup things */
1035
if (sb != NULL)
1036
avahi_s_service_browser_free(sb);
1037
1038
if (mc.server != NULL)
1039
avahi_server_free(mc.server);
1040
1041
if (mc.simple_poll != NULL)
1042
avahi_simple_poll_free(mc.simple_poll);
1043
free(pubkeyfilename);
1044
free(seckeyfilename);
1045
1046
if (gnutls_initalized){
1047
gnutls_certificate_free_credentials(mc.cred);
1048
gnutls_global_deinit ();
1049
}
1050
1051
return exitcode;
1472
1052
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0