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- Committer: Teddy Hogeborn
- Date: 2008-08-12 19:22:34 UTC
- Revision ID: teddy@fukt.bsnet.se-20080812192234-8bm17713ltih9ud1
* initramfs-tools-hook: New.
* initramfs-tools-hook-conf: New.
* initramfs-tools-hook-conf: New.
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- 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
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
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
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
45
strerror(), memcpy(), strcpy() */
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
getuid(), getgid(), seteuid(),
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
99
81
#include <avahi-common/error.h>
100
82
101
83
/* GnuTLS */
102
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
103
functions:
84
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
104
85
gnutls_*
105
86
init_gnutls_session(),
106
87
GNUTLS_* */
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
88
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
109
89
GNUTLS_OPENPGP_FMT_BASE64 */
110
90
111
91
/* GPGME */
112
#include <gpgme.h> /* All GPGME types, constants and
113
functions:
92
#include <gpgme.h> /* All GPGME types, constants and functions
114
93
gpgme_*
115
94
GPGME_PROTOCOL_OpenPGP,
116
95
GPG_ERR_NO_* */
117
96
118
97
#define BUFFER_SIZE 256
119
98
120
#define PATHDIR "/conf/conf.d/mandos"
121
#define SECKEY "seckey.txt"
122
#define PUBKEY "pubkey.txt"
123
124
99
bool debug = false;
100
static const char *keydir = "/conf/conf.d/mandos";
125
101
static const char mandos_protocol_version[] = "1";
126
const char *argp_program_version = "mandos-client " VERSION;
102
const char *argp_program_version = "password-request 1.0";
127
103
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
128
104
129
105
/* Used for passing in values through the Avahi callback functions */
134
110
unsigned int dh_bits;
135
111
gnutls_dh_params_t dh_params;
136
112
const char *priority;
137
gpgme_ctx_t ctx;
138
113
} mandos_context;
139
114
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
115
/*
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
116
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
117
* "buffer_capacity" is how much is currently allocated,
148
118
* "buffer_length" is how much is already used.
149
119
*/
150
size_t incbuffer(char **buffer, size_t buffer_length,
120
size_t adjustbuffer(char **buffer, size_t buffer_length,
151
121
size_t buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
122
if (buffer_length + BUFFER_SIZE > buffer_capacity){
153
123
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
124
if (buffer == NULL){
155
125
return 0;
156
126
}
157
127
buffer_capacity += BUFFER_SIZE;
160
130
}
161
131
162
132
/*
163
* Initialize GPGME.
133
* Decrypt OpenPGP data using keyrings in HOMEDIR.
134
* Returns -1 on error
164
135
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
136
static ssize_t pgp_packet_decrypt (const char *cryptotext,
137
size_t crypto_size,
138
char **plaintext,
139
const char *homedir){
140
gpgme_data_t dh_crypto, dh_plain;
141
gpgme_ctx_t ctx;
167
142
gpgme_error_t rc;
143
ssize_t ret;
144
size_t plaintext_capacity = 0;
145
ssize_t plaintext_length = 0;
168
146
gpgme_engine_info_t engine_info;
169
147
170
171
/*
172
* Helper function to insert pub and seckey to the engine keyring.
173
*/
174
bool import_key(const char *filename){
175
int ret;
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");
148
if (debug){
149
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
209
150
}
210
151
211
152
/* Init GPGME */
212
153
gpgme_check_version(NULL);
213
154
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
if(rc != GPG_ERR_NO_ERROR){
155
if (rc != GPG_ERR_NO_ERROR){
215
156
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
157
gpgme_strsource(rc), gpgme_strerror(rc));
217
return false;
158
return -1;
218
159
}
219
160
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){
161
/* Set GPGME home directory for the OpenPGP engine only */
162
rc = gpgme_get_engine_info (&engine_info);
163
if (rc != GPG_ERR_NO_ERROR){
223
164
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
165
gpgme_strsource(rc), gpgme_strerror(rc));
225
return false;
166
return -1;
226
167
}
227
168
while(engine_info != NULL){
228
169
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
229
170
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
230
engine_info->file_name, tempdir);
171
engine_info->file_name, homedir);
231
172
break;
232
173
}
233
174
engine_info = engine_info->next;
234
175
}
235
176
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");
177
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
178
return -1;
270
179
}
271
180
272
181
/* Create new GPGME data buffer from memory cryptotext */
273
182
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
183
0);
275
if(rc != GPG_ERR_NO_ERROR){
184
if (rc != GPG_ERR_NO_ERROR){
276
185
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
186
gpgme_strsource(rc), gpgme_strerror(rc));
278
187
return -1;
280
189
281
190
/* Create new empty GPGME data buffer for the plaintext */
282
191
rc = gpgme_data_new(&dh_plain);
283
if(rc != GPG_ERR_NO_ERROR){
192
if (rc != GPG_ERR_NO_ERROR){
284
193
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
194
gpgme_strsource(rc), gpgme_strerror(rc));
286
195
gpgme_data_release(dh_crypto);
287
196
return -1;
288
197
}
289
198
199
/* Create new GPGME "context" */
200
rc = gpgme_new(&ctx);
201
if (rc != GPG_ERR_NO_ERROR){
202
fprintf(stderr, "bad gpgme_new: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
204
plaintext_length = -1;
205
goto decrypt_end;
206
}
207
290
208
/* Decrypt data from the cryptotext data buffer to the plaintext
291
209
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
210
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
211
if (rc != GPG_ERR_NO_ERROR){
294
212
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
213
gpgme_strsource(rc), gpgme_strerror(rc));
296
214
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;
215
goto decrypt_end;
216
}
217
218
if(debug){
219
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
220
}
221
222
if (debug){
223
gpgme_decrypt_result_t result;
224
result = gpgme_op_decrypt_result(ctx);
225
if (result == NULL){
226
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
227
} else {
228
fprintf(stderr, "Unsupported algorithm: %s\n",
229
result->unsupported_algorithm);
230
fprintf(stderr, "Wrong key usage: %u\n",
231
result->wrong_key_usage);
232
if(result->file_name != NULL){
233
fprintf(stderr, "File name: %s\n", result->file_name);
234
}
235
gpgme_recipient_t recipient;
236
recipient = result->recipients;
237
if(recipient){
312
238
while(recipient != NULL){
313
239
fprintf(stderr, "Public key algorithm: %s\n",
314
240
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
246
}
321
247
}
322
248
}
323
goto decrypt_end;
324
}
325
326
if(debug){
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
328
249
}
329
250
330
251
/* 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");
252
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
253
perror("pgpme_data_seek");
333
254
plaintext_length = -1;
334
255
goto decrypt_end;
335
256
}
336
257
337
258
*plaintext = NULL;
338
259
while(true){
339
plaintext_capacity = incbuffer(plaintext,
260
plaintext_capacity = adjustbuffer(plaintext,
340
261
(size_t)plaintext_length,
341
262
plaintext_capacity);
342
if(plaintext_capacity == 0){
343
perror("incbuffer");
263
if (plaintext_capacity == 0){
264
perror("adjustbuffer");
344
265
plaintext_length = -1;
345
266
goto decrypt_end;
346
267
}
348
269
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
349
270
BUFFER_SIZE);
350
271
/* Print the data, if any */
351
if(ret == 0){
272
if (ret == 0){
352
273
/* EOF */
353
274
break;
354
275
}
359
280
}
360
281
plaintext_length += ret;
361
282
}
362
283
363
284
if(debug){
364
285
fprintf(stderr, "Decrypted password is: ");
365
286
for(ssize_t i = 0; i < plaintext_length; i++){
378
299
return plaintext_length;
379
300
}
380
301
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)
302
static const char * safer_gnutls_strerror (int value) {
303
const char *ret = gnutls_strerror (value);
304
if (ret == NULL)
385
305
ret = "(unknown)";
386
306
return ret;
387
307
}
392
312
fprintf(stderr, "GnuTLS: %s", string);
393
313
}
394
314
395
static int init_gnutls_global(const char *pubkeyfilename,
396
const char *seckeyfilename){
315
static int init_gnutls_global(mandos_context *mc,
316
const char *pubkeyfile,
317
const char *seckeyfile){
397
318
int ret;
398
319
399
320
if(debug){
401
322
}
402
323
403
324
ret = gnutls_global_init();
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
325
if (ret != GNUTLS_E_SUCCESS) {
326
fprintf (stderr, "GnuTLS global_init: %s\n",
327
safer_gnutls_strerror(ret));
407
328
return -1;
408
329
}
409
330
410
if(debug){
331
if (debug){
411
332
/* "Use a log level over 10 to enable all debugging options."
412
333
* - GnuTLS manual
413
334
*/
416
337
}
417
338
418
339
/* 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();
340
gnutls_certificate_allocate_credentials(&mc->cred);
341
if (ret != GNUTLS_E_SUCCESS){
342
fprintf (stderr, "GnuTLS memory error: %s\n",
343
safer_gnutls_strerror(ret));
344
gnutls_global_deinit ();
427
345
return -1;
428
346
}
429
347
430
348
if(debug){
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
349
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
350
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
351
seckeyfile);
434
352
}
435
353
436
354
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
438
GNUTLS_OPENPGP_FMT_BASE64);
439
if(ret != GNUTLS_E_SUCCESS){
355
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
356
if (ret != GNUTLS_E_SUCCESS) {
440
357
fprintf(stderr,
441
358
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
359
" '%s')\n", ret, pubkeyfile, seckeyfile);
360
fprintf(stdout, "The GnuTLS error is: %s\n",
444
361
safer_gnutls_strerror(ret));
445
362
goto globalfail;
446
363
}
447
364
448
365
/* 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
366
ret = gnutls_dh_params_init(&mc->dh_params);
367
if (ret != GNUTLS_E_SUCCESS) {
368
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
369
" %s\n", safer_gnutls_strerror(ret));
370
goto globalfail;
371
}
372
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
373
if (ret != GNUTLS_E_SUCCESS) {
374
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
375
safer_gnutls_strerror(ret));
376
goto globalfail;
377
}
378
379
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
380
464
381
return 0;
465
382
466
383
globalfail:
467
468
gnutls_certificate_free_credentials(mc.cred);
384
385
gnutls_certificate_free_credentials(mc->cred);
469
386
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
471
387
return -1;
388
472
389
}
473
390
474
static int init_gnutls_session(gnutls_session_t *session){
391
static int init_gnutls_session(mandos_context *mc,
392
gnutls_session_t *session){
475
393
int ret;
476
394
/* GnuTLS session creation */
477
do {
478
ret = gnutls_init(session, GNUTLS_SERVER);
479
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
480
if(ret != GNUTLS_E_SUCCESS){
395
ret = gnutls_init(session, GNUTLS_SERVER);
396
if (ret != GNUTLS_E_SUCCESS){
481
397
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
398
safer_gnutls_strerror(ret));
483
399
}
484
400
485
401
{
486
402
const char *err;
487
do {
488
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
if(ret != GNUTLS_E_SUCCESS){
403
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
404
if (ret != GNUTLS_E_SUCCESS) {
491
405
fprintf(stderr, "Syntax error at: %s\n", err);
492
406
fprintf(stderr, "GnuTLS error: %s\n",
493
407
safer_gnutls_strerror(ret));
494
gnutls_deinit(*session);
408
gnutls_deinit (*session);
495
409
return -1;
496
410
}
497
411
}
498
412
499
do {
500
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
501
mc.cred);
502
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
503
if(ret != GNUTLS_E_SUCCESS){
413
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
414
mc->cred);
415
if (ret != GNUTLS_E_SUCCESS) {
504
416
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
505
417
safer_gnutls_strerror(ret));
506
gnutls_deinit(*session);
418
gnutls_deinit (*session);
507
419
return -1;
508
420
}
509
421
510
422
/* ignore client certificate if any. */
511
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
423
gnutls_certificate_server_set_request (*session,
424
GNUTLS_CERT_IGNORE);
512
425
513
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
426
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
514
427
515
428
return 0;
516
429
}
519
432
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
520
433
__attribute__((unused)) const char *txt){}
521
434
522
sig_atomic_t quit_now = 0;
523
int signal_received = 0;
524
525
435
/* Called when a Mandos server is found */
526
436
static int start_mandos_communication(const char *ip, uint16_t port,
527
437
AvahiIfIndex if_index,
528
int af){
529
int ret, tcp_sd = -1;
530
ssize_t sret;
531
union {
532
struct sockaddr_in in;
533
struct sockaddr_in6 in6;
534
} to;
438
mandos_context *mc){
439
int ret, tcp_sd;
440
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
535
441
char *buffer = NULL;
536
442
char *decrypted_buffer;
537
443
size_t buffer_length = 0;
538
444
size_t buffer_capacity = 0;
445
ssize_t decrypted_buffer_size;
539
446
size_t written;
540
447
int retval = 0;
448
char interface[IF_NAMESIZE];
541
449
gnutls_session_t session;
542
int pf; /* Protocol family */
543
544
if(quit_now){
545
return -1;
546
}
547
548
switch(af){
549
case AF_INET6:
550
pf = PF_INET6;
551
break;
552
case AF_INET:
553
pf = PF_INET;
554
break;
555
default:
556
fprintf(stderr, "Bad address family: %d\n", af);
557
return -1;
558
}
559
560
ret = init_gnutls_session(&session);
561
if(ret != 0){
450
451
ret = init_gnutls_session (mc, &session);
452
if (ret != 0){
562
453
return -1;
563
454
}
564
455
565
456
if(debug){
566
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
457
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
567
458
"\n", ip, port);
568
459
}
569
460
570
tcp_sd = socket(pf, SOCK_STREAM, 0);
571
if(tcp_sd < 0){
461
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
462
if(tcp_sd < 0) {
572
463
perror("socket");
573
retval = -1;
574
goto mandos_end;
575
}
576
577
if(quit_now){
578
goto mandos_end;
579
}
580
581
memset(&to, 0, sizeof(to));
582
if(af == AF_INET6){
583
to.in6.sin6_family = (sa_family_t)af;
584
ret = inet_pton(af, ip, &to.in6.sin6_addr);
585
} else { /* IPv4 */
586
to.in.sin_family = (sa_family_t)af;
587
ret = inet_pton(af, ip, &to.in.sin_addr);
588
}
589
if(ret < 0 ){
464
return -1;
465
}
466
467
if(debug){
468
if(if_indextoname((unsigned int)if_index, interface) == NULL){
469
perror("if_indextoname");
470
return -1;
471
}
472
fprintf(stderr, "Binding to interface %s\n", interface);
473
}
474
475
memset(&to,0,sizeof(to)); /* Spurious warning */
476
to.in6.sin6_family = AF_INET6;
477
/* It would be nice to have a way to detect if we were passed an
478
IPv4 address here. Now we assume an IPv6 address. */
479
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
480
if (ret < 0 ){
590
481
perror("inet_pton");
591
retval = -1;
592
goto mandos_end;
482
return -1;
593
483
}
594
484
if(ret == 0){
595
485
fprintf(stderr, "Bad address: %s\n", ip);
596
retval = -1;
597
goto mandos_end;
598
}
599
if(af == AF_INET6){
600
to.in6.sin6_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
603
604
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
605
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
606
-Wunreachable-code*/
607
if(if_index == AVAHI_IF_UNSPEC){
608
fprintf(stderr, "An IPv6 link-local address is incomplete"
609
" without a network interface\n");
610
retval = -1;
611
goto mandos_end;
612
}
613
/* Set the network interface number as scope */
614
to.in6.sin6_scope_id = (uint32_t)if_index;
615
}
616
} else {
617
to.in.sin_port = htons(port); /* Spurious warnings from
618
-Wconversion and
619
-Wunreachable-code */
620
}
486
return -1;
487
}
488
to.in6.sin6_port = htons(port); /* Spurious warning */
621
489
622
if(quit_now){
623
goto mandos_end;
624
}
490
to.in6.sin6_scope_id = (uint32_t)if_index;
625
491
626
492
if(debug){
627
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
628
char interface[IF_NAMESIZE];
629
if(if_indextoname((unsigned int)if_index, interface) == NULL){
630
perror("if_indextoname");
631
} else {
632
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
633
ip, interface, port);
634
}
635
} else {
636
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
637
port);
638
}
639
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
640
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
641
const char *pcret;
642
if(af == AF_INET6){
643
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
644
sizeof(addrstr));
645
} else {
646
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
647
sizeof(addrstr));
648
}
649
if(pcret == NULL){
493
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
494
port);
495
char addrstr[INET6_ADDRSTRLEN] = "";
496
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
497
sizeof(addrstr)) == NULL){
650
498
perror("inet_ntop");
651
499
} else {
652
500
if(strcmp(addrstr, ip) != 0){
655
503
}
656
504
}
657
505
658
if(quit_now){
659
goto mandos_end;
660
}
661
662
if(af == AF_INET6){
663
ret = connect(tcp_sd, &to.in6, sizeof(to));
664
} else {
665
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
666
}
667
if(ret < 0){
506
ret = connect(tcp_sd, &to.in, sizeof(to));
507
if (ret < 0){
668
508
perror("connect");
669
retval = -1;
670
goto mandos_end;
671
}
672
673
if(quit_now){
674
goto mandos_end;
675
}
676
509
return -1;
510
}
511
677
512
const char *out = mandos_protocol_version;
678
513
written = 0;
679
while(true){
514
while (true){
680
515
size_t out_size = strlen(out);
681
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
682
517
out_size - written));
683
if(ret == -1){
518
if (ret == -1){
684
519
perror("write");
685
520
retval = -1;
686
521
goto mandos_end;
689
524
if(written < out_size){
690
525
continue;
691
526
} else {
692
if(out == mandos_protocol_version){
527
if (out == mandos_protocol_version){
693
528
written = 0;
694
529
out = "\r\n";
695
530
} else {
696
531
break;
697
532
}
698
533
}
699
700
if(quit_now){
701
goto mandos_end;
702
}
703
534
}
704
535
705
536
if(debug){
706
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
707
538
}
708
539
709
if(quit_now){
710
goto mandos_end;
711
}
712
713
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
714
715
if(quit_now){
716
goto mandos_end;
717
}
718
719
do {
720
ret = gnutls_handshake(session);
721
if(quit_now){
722
goto mandos_end;
723
}
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
542
do{
543
ret = gnutls_handshake (session);
724
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
725
545
726
if(ret != GNUTLS_E_SUCCESS){
546
if (ret != GNUTLS_E_SUCCESS){
727
547
if(debug){
728
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
729
gnutls_perror(ret);
549
gnutls_perror (ret);
730
550
}
731
551
retval = -1;
732
552
goto mandos_end;
735
555
/* Read OpenPGP packet that contains the wanted password */
736
556
737
557
if(debug){
738
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
739
559
ip);
740
560
}
741
561
742
562
while(true){
743
744
if(quit_now){
745
goto mandos_end;
746
}
747
748
buffer_capacity = incbuffer(&buffer, buffer_length,
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
749
564
buffer_capacity);
750
if(buffer_capacity == 0){
751
perror("incbuffer");
565
if (buffer_capacity == 0){
566
perror("adjustbuffer");
752
567
retval = -1;
753
568
goto mandos_end;
754
569
}
755
570
756
if(quit_now){
757
goto mandos_end;
758
}
759
760
sret = gnutls_record_recv(session, buffer+buffer_length,
761
BUFFER_SIZE);
762
if(sret == 0){
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
573
if (ret == 0){
763
574
break;
764
575
}
765
if(sret < 0){
766
switch(sret){
576
if (ret < 0){
577
switch(ret){
767
578
case GNUTLS_E_INTERRUPTED:
768
579
case GNUTLS_E_AGAIN:
769
580
break;
770
581
case GNUTLS_E_REHANDSHAKE:
771
do {
772
ret = gnutls_handshake(session);
773
774
if(quit_now){
775
goto mandos_end;
776
}
582
do{
583
ret = gnutls_handshake (session);
777
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
778
if(ret < 0){
585
if (ret < 0){
779
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
780
gnutls_perror(ret);
587
gnutls_perror (ret);
781
588
retval = -1;
782
589
goto mandos_end;
783
590
}
786
593
fprintf(stderr, "Unknown error while reading data from"
787
594
" encrypted session with Mandos server\n");
788
595
retval = -1;
789
gnutls_bye(session, GNUTLS_SHUT_RDWR);
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
790
597
goto mandos_end;
791
598
}
792
599
} else {
793
buffer_length += (size_t) sret;
600
buffer_length += (size_t) ret;
794
601
}
795
602
}
796
603
798
605
fprintf(stderr, "Closing TLS session\n");
799
606
}
800
607
801
if(quit_now){
802
goto mandos_end;
803
}
804
805
gnutls_bye(session, GNUTLS_SHUT_RDWR);
806
807
if(quit_now){
808
goto mandos_end;
809
}
810
811
if(buffer_length > 0){
812
ssize_t decrypted_buffer_size;
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
609
610
if (buffer_length > 0){
813
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
814
612
buffer_length,
815
&decrypted_buffer);
816
if(decrypted_buffer_size >= 0){
817
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
818
616
written = 0;
819
617
while(written < (size_t) decrypted_buffer_size){
820
if(quit_now){
821
goto mandos_end;
822
}
823
824
ret = (int)fwrite(decrypted_buffer + written, 1,
825
(size_t)decrypted_buffer_size - written,
826
stdout);
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
stdout);
827
621
if(ret == 0 and ferror(stdout)){
828
622
if(debug){
829
623
fprintf(stderr, "Error writing encrypted data: %s\n",
838
632
} else {
839
633
retval = -1;
840
634
}
841
} else {
842
retval = -1;
843
635
}
844
636
845
637
/* Shutdown procedure */
846
638
847
639
mandos_end:
848
640
free(buffer);
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
852
if(ret == -1){
853
perror("close");
854
}
855
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
858
}
641
close(tcp_sd);
642
gnutls_deinit (session);
859
643
return retval;
860
644
}
861
645
862
646
static void resolve_callback(AvahiSServiceResolver *r,
863
647
AvahiIfIndex interface,
864
AvahiProtocol proto,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
865
649
AvahiResolverEvent event,
866
650
const char *name,
867
651
const char *type,
872
656
AVAHI_GCC_UNUSED AvahiStringList *txt,
873
657
AVAHI_GCC_UNUSED AvahiLookupResultFlags
874
658
flags,
875
AVAHI_GCC_UNUSED void* userdata){
876
assert(r);
659
void* userdata) {
660
mandos_context *mc = userdata;
661
assert(r); /* Spurious warning */
877
662
878
663
/* Called whenever a service has been resolved successfully or
879
664
timed out */
880
665
881
if(quit_now){
882
return;
883
}
884
885
switch(event){
666
switch (event) {
886
667
default:
887
668
case AVAHI_RESOLVER_FAILURE:
888
669
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
889
670
" of type '%s' in domain '%s': %s\n", name, type, domain,
890
avahi_strerror(avahi_server_errno(mc.server)));
671
avahi_strerror(avahi_server_errno(mc->server)));
891
672
break;
892
673
893
674
case AVAHI_RESOLVER_FOUND:
896
677
avahi_address_snprint(ip, sizeof(ip), address);
897
678
if(debug){
898
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
899
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
ip, (intmax_t)interface, port);
680
PRIu16 ") on port %d\n", name, host_name, ip,
681
interface, port);
901
682
}
902
int ret = start_mandos_communication(ip, port, interface,
903
avahi_proto_to_af(proto));
904
if(ret == 0){
905
avahi_simple_poll_quit(mc.simple_poll);
683
int ret = start_mandos_communication(ip, port, interface, mc);
684
if (ret == 0){
685
exit(EXIT_SUCCESS);
906
686
}
907
687
}
908
688
}
909
689
avahi_s_service_resolver_free(r);
910
690
}
911
691
912
static void browse_callback(AvahiSServiceBrowser *b,
913
AvahiIfIndex interface,
914
AvahiProtocol protocol,
915
AvahiBrowserEvent event,
916
const char *name,
917
const char *type,
918
const char *domain,
919
AVAHI_GCC_UNUSED AvahiLookupResultFlags
920
flags,
921
AVAHI_GCC_UNUSED void* userdata){
922
assert(b);
692
static void browse_callback( AvahiSServiceBrowser *b,
693
AvahiIfIndex interface,
694
AvahiProtocol protocol,
695
AvahiBrowserEvent event,
696
const char *name,
697
const char *type,
698
const char *domain,
699
AVAHI_GCC_UNUSED AvahiLookupResultFlags
700
flags,
701
void* userdata) {
702
mandos_context *mc = userdata;
703
assert(b); /* Spurious warning */
923
704
924
705
/* Called whenever a new services becomes available on the LAN or
925
706
is removed from the LAN */
926
707
927
if(quit_now){
928
return;
929
}
930
931
switch(event){
708
switch (event) {
932
709
default:
933
710
case AVAHI_BROWSER_FAILURE:
934
711
935
712
fprintf(stderr, "(Avahi browser) %s\n",
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
713
avahi_strerror(avahi_server_errno(mc->server)));
714
avahi_simple_poll_quit(mc->simple_poll);
938
715
return;
939
716
940
717
case AVAHI_BROWSER_NEW:
943
720
the callback function is called the Avahi server will free the
944
721
resolver for us. */
945
722
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
947
name, type, domain, protocol, 0,
948
resolve_callback, NULL) == NULL)
723
if (!(avahi_s_service_resolver_new(mc->server, interface,
724
protocol, name, type, domain,
725
AVAHI_PROTO_INET6, 0,
726
resolve_callback, mc)))
949
727
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
950
name, avahi_strerror(avahi_server_errno(mc.server)));
728
name, avahi_strerror(avahi_server_errno(mc->server)));
951
729
break;
952
730
953
731
case AVAHI_BROWSER_REMOVE:
962
740
}
963
741
}
964
742
965
/* stop main loop after sigterm has been called */
966
static void handle_sigterm(int sig){
967
if(quit_now){
968
return;
969
}
970
quit_now = 1;
971
signal_received = sig;
972
int old_errno = errno;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
975
}
976
errno = old_errno;
743
/* Combines file name and path and returns the malloced new
744
string. some sane checks could/should be added */
745
static const char *combinepath(const char *first, const char *second){
746
size_t f_len = strlen(first);
747
size_t s_len = strlen(second);
748
char *tmp = malloc(f_len + s_len + 2);
749
if (tmp == NULL){
750
return NULL;
751
}
752
if(f_len > 0){
753
memcpy(tmp, first, f_len); /* Spurious warning */
754
}
755
tmp[f_len] = '/';
756
if(s_len > 0){
757
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
758
}
759
tmp[f_len + 1 + s_len] = '\0';
760
return tmp;
977
761
}
978
762
763
979
764
int main(int argc, char *argv[]){
980
AvahiSServiceBrowser *sb = NULL;
981
int error;
982
int ret;
983
intmax_t tmpmax;
984
char *tmp;
985
int exitcode = EXIT_SUCCESS;
986
const char *interface = "eth0";
987
struct ifreq network;
988
int sd = -1;
989
bool take_down_interface = false;
990
uid_t uid;
991
gid_t gid;
992
char *connect_to = NULL;
993
char tempdir[] = "/tmp/mandosXXXXXX";
994
bool tempdir_created = false;
995
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
996
const char *seckey = PATHDIR "/" SECKEY;
997
const char *pubkey = PATHDIR "/" PUBKEY;
998
999
bool gnutls_initialized = false;
1000
bool gpgme_initialized = false;
1001
float delay = 2.5f;
1002
1003
struct sigaction old_sigterm_action;
1004
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1005
1006
uid = getuid();
1007
gid = getgid();
1008
1009
/* Lower any group privileges we might have, just to be safe */
1010
errno = 0;
1011
ret = setgid(gid);
1012
if(ret == -1){
1013
perror("setgid");
1014
}
1015
1016
/* Lower user privileges (temporarily) */
1017
errno = 0;
1018
ret = seteuid(uid);
1019
if(ret == -1){
1020
perror("seteuid");
1021
}
1022
1023
if(quit_now){
1024
goto end;
1025
}
1026
1027
{
1028
struct argp_option options[] = {
1029
{ .name = "debug", .key = 128,
1030
.doc = "Debug mode", .group = 3 },
1031
{ .name = "connect", .key = 'c',
1032
.arg = "ADDRESS:PORT",
1033
.doc = "Connect directly to a specific Mandos server",
1034
.group = 1 },
1035
{ .name = "interface", .key = 'i',
1036
.arg = "NAME",
1037
.doc = "Network interface that will be used to search for"
1038
" Mandos servers",
1039
.group = 1 },
1040
{ .name = "seckey", .key = 's',
1041
.arg = "FILE",
1042
.doc = "OpenPGP secret key file base name",
1043
.group = 1 },
1044
{ .name = "pubkey", .key = 'p',
1045
.arg = "FILE",
1046
.doc = "OpenPGP public key file base name",
1047
.group = 2 },
1048
{ .name = "dh-bits", .key = 129,
1049
.arg = "BITS",
1050
.doc = "Bit length of the prime number used in the"
1051
" Diffie-Hellman key exchange",
1052
.group = 2 },
1053
{ .name = "priority", .key = 130,
1054
.arg = "STRING",
1055
.doc = "GnuTLS priority string for the TLS handshake",
1056
.group = 1 },
1057
{ .name = "delay", .key = 131,
1058
.arg = "SECONDS",
1059
.doc = "Maximum delay to wait for interface startup",
1060
.group = 2 },
1061
{ .name = NULL }
1062
};
1063
1064
error_t parse_opt(int key, char *arg,
1065
struct argp_state *state){
1066
switch(key){
1067
case 128: /* --debug */
1068
debug = true;
1069
break;
1070
case 'c': /* --connect */
1071
connect_to = arg;
1072
break;
1073
case 'i': /* --interface */
1074
interface = arg;
1075
break;
1076
case 's': /* --seckey */
1077
seckey = arg;
1078
break;
1079
case 'p': /* --pubkey */
1080
pubkey = arg;
1081
break;
1082
case 129: /* --dh-bits */
1083
errno = 0;
1084
tmpmax = strtoimax(arg, &tmp, 10);
1085
if(errno != 0 or tmp == arg or *tmp != '\0'
1086
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1087
fprintf(stderr, "Bad number of DH bits\n");
1088
exit(EXIT_FAILURE);
1089
}
1090
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1091
break;
1092
case 130: /* --priority */
1093
mc.priority = arg;
1094
break;
1095
case 131: /* --delay */
1096
errno = 0;
1097
delay = strtof(arg, &tmp);
1098
if(errno != 0 or tmp == arg or *tmp != '\0'){
1099
fprintf(stderr, "Bad delay\n");
1100
exit(EXIT_FAILURE);
1101
}
1102
break;
1103
case ARGP_KEY_ARG:
1104
argp_usage(state);
1105
case ARGP_KEY_END:
1106
break;
1107
default:
1108
return ARGP_ERR_UNKNOWN;
1109
}
1110
return 0;
1111
}
1112
1113
struct argp argp = { .options = options, .parser = parse_opt,
1114
.args_doc = "",
1115
.doc = "Mandos client -- Get and decrypt"
1116
" passwords from a Mandos server" };
1117
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1118
if(ret == ARGP_ERR_UNKNOWN){
1119
fprintf(stderr, "Unknown error while parsing arguments\n");
1120
exitcode = EXIT_FAILURE;
1121
goto end;
1122
}
1123
}
1124
1125
if(not debug){
1126
avahi_set_log_function(empty_log);
1127
}
1128
1129
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1130
from the signal handler */
1131
/* Initialize the pseudo-RNG for Avahi */
1132
srand((unsigned int) time(NULL));
1133
mc.simple_poll = avahi_simple_poll_new();
1134
if(mc.simple_poll == NULL){
1135
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1136
exitcode = EXIT_FAILURE;
1137
goto end;
1138
}
1139
1140
sigemptyset(&sigterm_action.sa_mask);
1141
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1142
if(ret == -1){
1143
perror("sigaddset");
1144
exitcode = EXIT_FAILURE;
1145
goto end;
1146
}
1147
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1148
if(ret == -1){
1149
perror("sigaddset");
1150
exitcode = EXIT_FAILURE;
1151
goto end;
1152
}
1153
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1154
if(ret == -1){
1155
perror("sigaddset");
1156
exitcode = EXIT_FAILURE;
1157
goto end;
1158
}
1159
/* Need to check if the handler is SIG_IGN before handling:
1160
| [[info:libc:Initial Signal Actions]] |
1161
| [[info:libc:Basic Signal Handling]] |
1162
*/
1163
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1164
if(ret == -1){
1165
perror("sigaction");
1166
return EXIT_FAILURE;
1167
}
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
1169
ret = sigaction(SIGINT, &sigterm_action, NULL);
1170
if(ret == -1){
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1173
goto end;
1174
}
1175
}
1176
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1177
if(ret == -1){
1178
perror("sigaction");
1179
return EXIT_FAILURE;
1180
}
1181
if(old_sigterm_action.sa_handler != SIG_IGN){
1182
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1183
if(ret == -1){
1184
perror("sigaction");
1185
exitcode = EXIT_FAILURE;
1186
goto end;
1187
}
1188
}
1189
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1190
if(ret == -1){
1191
perror("sigaction");
1192
return EXIT_FAILURE;
1193
}
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1196
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1199
goto end;
1200
}
1201
}
1202
1203
/* If the interface is down, bring it up */
1204
if(interface[0] != '\0'){
765
AvahiSServiceBrowser *sb = NULL;
766
int error;
767
int ret;
768
int exitcode = EXIT_SUCCESS;
769
const char *interface = "eth0";
770
struct ifreq network;
771
int sd;
772
uid_t uid;
773
gid_t gid;
774
char *connect_to = NULL;
775
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
776
const char *pubkeyfile = "pubkey.txt";
777
const char *seckeyfile = "seckey.txt";
778
mandos_context mc = { .simple_poll = NULL, .server = NULL,
779
.dh_bits = 1024, .priority = "SECURE256"};
780
bool gnutls_initalized = false;
781
782
{
783
struct argp_option options[] = {
784
{ .name = "debug", .key = 128,
785
.doc = "Debug mode", .group = 3 },
786
{ .name = "connect", .key = 'c',
787
.arg = "IP",
788
.doc = "Connect directly to a sepcified mandos server",
789
.group = 1 },
790
{ .name = "interface", .key = 'i',
791
.arg = "INTERFACE",
792
.doc = "Interface that Avahi will conntect through",
793
.group = 1 },
794
{ .name = "keydir", .key = 'd',
795
.arg = "KEYDIR",
796
.doc = "Directory where the openpgp keyring is",
797
.group = 1 },
798
{ .name = "seckey", .key = 's',
799
.arg = "SECKEY",
800
.doc = "Secret openpgp key for gnutls authentication",
801
.group = 1 },
802
{ .name = "pubkey", .key = 'p',
803
.arg = "PUBKEY",
804
.doc = "Public openpgp key for gnutls authentication",
805
.group = 2 },
806
{ .name = "dh-bits", .key = 129,
807
.arg = "BITS",
808
.doc = "dh-bits to use in gnutls communication",
809
.group = 2 },
810
{ .name = "priority", .key = 130,
811
.arg = "PRIORITY",
812
.doc = "GNUTLS priority", .group = 1 },
813
{ .name = NULL }
814
};
815
816
817
error_t parse_opt (int key, char *arg,
818
struct argp_state *state) {
819
/* Get the INPUT argument from `argp_parse', which we know is
820
a pointer to our plugin list pointer. */
821
switch (key) {
822
case 128:
823
debug = true;
824
break;
825
case 'c':
826
connect_to = arg;
827
break;
828
case 'i':
829
interface = arg;
830
break;
831
case 'd':
832
keydir = arg;
833
break;
834
case 's':
835
seckeyfile = arg;
836
break;
837
case 'p':
838
pubkeyfile = arg;
839
break;
840
case 129:
841
errno = 0;
842
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
843
if (errno){
844
perror("strtol");
845
exit(EXIT_FAILURE);
846
}
847
break;
848
case 130:
849
mc.priority = arg;
850
break;
851
case ARGP_KEY_ARG:
852
argp_usage (state);
853
break;
854
case ARGP_KEY_END:
855
break;
856
default:
857
return ARGP_ERR_UNKNOWN;
858
}
859
return 0;
860
}
861
862
struct argp argp = { .options = options, .parser = parse_opt,
863
.args_doc = "",
864
.doc = "Mandos client -- Get and decrypt"
865
" passwords from mandos server" };
866
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
867
if (ret == ARGP_ERR_UNKNOWN){
868
fprintf(stderr, "Unknown error while parsing arguments\n");
869
exitcode = EXIT_FAILURE;
870
goto end;
871
}
872
}
873
874
pubkeyfile = combinepath(keydir, pubkeyfile);
875
if (pubkeyfile == NULL){
876
perror("combinepath");
877
exitcode = EXIT_FAILURE;
878
goto end;
879
}
880
881
seckeyfile = combinepath(keydir, seckeyfile);
882
if (seckeyfile == NULL){
883
perror("combinepath");
884
exitcode = EXIT_FAILURE;
885
goto end;
886
}
887
888
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
889
if (ret == -1){
890
fprintf(stderr, "init_gnutls_global failed\n");
891
exitcode = EXIT_FAILURE;
892
goto end;
893
} else {
894
gnutls_initalized = true;
895
}
896
897
/* If the interface is down, bring it up */
898
{
899
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
900
if(sd < 0) {
901
perror("socket");
902
exitcode = EXIT_FAILURE;
903
goto end;
904
}
905
strcpy(network.ifr_name, interface); /* Spurious warning */
906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
907
if(ret == -1){
908
perror("ioctl SIOCGIFFLAGS");
909
exitcode = EXIT_FAILURE;
910
goto end;
911
}
912
if((network.ifr_flags & IFF_UP) == 0){
913
network.ifr_flags |= IFF_UP;
914
ret = ioctl(sd, SIOCSIFFLAGS, &network);
915
if(ret == -1){
916
perror("ioctl SIOCSIFFLAGS");
917
exitcode = EXIT_FAILURE;
918
goto end;
919
}
920
}
921
close(sd);
922
}
923
924
uid = getuid();
925
gid = getgid();
926
927
ret = setuid(uid);
928
if (ret == -1){
929
perror("setuid");
930
}
931
932
setgid(gid);
933
if (ret == -1){
934
perror("setgid");
935
}
936
1205
937
if_index = (AvahiIfIndex) if_nametoindex(interface);
1206
938
if(if_index == 0){
1207
939
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1208
exitcode = EXIT_FAILURE;
1209
goto end;
1210
}
1211
1212
if(quit_now){
1213
goto end;
1214
}
1215
1216
/* Re-raise priviliges */
1217
errno = 0;
1218
ret = seteuid(0);
1219
if(ret == -1){
1220
perror("seteuid");
1221
}
1222
1223
#ifdef __linux__
1224
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1225
messages to mess up the prompt */
1226
ret = klogctl(8, NULL, 5);
1227
bool restore_loglevel = true;
1228
if(ret == -1){
1229
restore_loglevel = false;
1230
perror("klogctl");
1231
}
1232
#endif /* __linux__ */
1233
1234
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1235
if(sd < 0){
1236
perror("socket");
1237
exitcode = EXIT_FAILURE;
1238
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
1243
}
1244
}
1245
#endif /* __linux__ */
1246
/* Lower privileges */
1247
errno = 0;
1248
ret = seteuid(uid);
1249
if(ret == -1){
1250
perror("seteuid");
1251
}
1252
goto end;
1253
}
1254
strcpy(network.ifr_name, interface);
1255
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1256
if(ret == -1){
1257
perror("ioctl SIOCGIFFLAGS");
1258
#ifdef __linux__
1259
if(restore_loglevel){
1260
ret = klogctl(7, NULL, 0);
1261
if(ret == -1){
1262
perror("klogctl");
1263
}
1264
}
1265
#endif /* __linux__ */
1266
exitcode = EXIT_FAILURE;
1267
/* Lower privileges */
1268
errno = 0;
1269
ret = seteuid(uid);
1270
if(ret == -1){
1271
perror("seteuid");
1272
}
1273
goto end;
1274
}
1275
if((network.ifr_flags & IFF_UP) == 0){
1276
network.ifr_flags |= IFF_UP;
1277
take_down_interface = true;
1278
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1279
if(ret == -1){
1280
take_down_interface = false;
1281
perror("ioctl SIOCSIFFLAGS");
1282
exitcode = EXIT_FAILURE;
1283
#ifdef __linux__
1284
if(restore_loglevel){
1285
ret = klogctl(7, NULL, 0);
1286
if(ret == -1){
1287
perror("klogctl");
1288
}
1289
}
1290
#endif /* __linux__ */
1291
/* Lower privileges */
1292
errno = 0;
1293
ret = seteuid(uid);
1294
if(ret == -1){
1295
perror("seteuid");
1296
}
1297
goto end;
1298
}
1299
}
1300
/* sleep checking until interface is running */
1301
for(int i=0; i < delay * 4; i++){
1302
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1303
if(ret == -1){
1304
perror("ioctl SIOCGIFFLAGS");
1305
} else if(network.ifr_flags & IFF_RUNNING){
1306
break;
1307
}
1308
struct timespec sleeptime = { .tv_nsec = 250000000 };
1309
ret = nanosleep(&sleeptime, NULL);
1310
if(ret == -1 and errno != EINTR){
1311
perror("nanosleep");
1312
}
1313
}
1314
if(not take_down_interface){
1315
/* We won't need the socket anymore */
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1317
if(ret == -1){
1318
perror("close");
1319
}
1320
}
1321
#ifdef __linux__
1322
if(restore_loglevel){
1323
/* Restores kernel loglevel to default */
1324
ret = klogctl(7, NULL, 0);
1325
if(ret == -1){
1326
perror("klogctl");
1327
}
1328
}
1329
#endif /* __linux__ */
1330
/* Lower privileges */
1331
errno = 0;
1332
if(take_down_interface){
1333
/* Lower privileges */
1334
ret = seteuid(uid);
1335
if(ret == -1){
1336
perror("seteuid");
1337
}
1338
} else {
1339
/* Lower privileges permanently */
1340
ret = setuid(uid);
1341
if(ret == -1){
1342
perror("setuid");
1343
}
1344
}
1345
}
1346
1347
if(quit_now){
1348
goto end;
1349
}
1350
1351
ret = init_gnutls_global(pubkey, seckey);
1352
if(ret == -1){
1353
fprintf(stderr, "init_gnutls_global failed\n");
1354
exitcode = EXIT_FAILURE;
1355
goto end;
1356
} else {
1357
gnutls_initialized = true;
1358
}
1359
1360
if(quit_now){
1361
goto end;
1362
}
1363
1364
tempdir_created = true;
1365
if(mkdtemp(tempdir) == NULL){
1366
tempdir_created = false;
1367
perror("mkdtemp");
1368
goto end;
1369
}
1370
1371
if(quit_now){
1372
goto end;
1373
}
1374
1375
if(not init_gpgme(pubkey, seckey, tempdir)){
1376
fprintf(stderr, "init_gpgme failed\n");
1377
exitcode = EXIT_FAILURE;
1378
goto end;
1379
} else {
1380
gpgme_initialized = true;
1381
}
1382
1383
if(quit_now){
1384
goto end;
1385
}
1386
1387
if(connect_to != NULL){
1388
/* Connect directly, do not use Zeroconf */
1389
/* (Mainly meant for debugging) */
1390
char *address = strrchr(connect_to, ':');
1391
if(address == NULL){
1392
fprintf(stderr, "No colon in address\n");
1393
exitcode = EXIT_FAILURE;
1394
goto end;
1395
}
1396
1397
if(quit_now){
1398
goto end;
1399
}
1400
1401
uint16_t port;
1402
errno = 0;
1403
tmpmax = strtoimax(address+1, &tmp, 10);
1404
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1405
or tmpmax != (uint16_t)tmpmax){
1406
fprintf(stderr, "Bad port number\n");
1407
exitcode = EXIT_FAILURE;
1408
goto end;
1409
}
1410
1411
if(quit_now){
1412
goto end;
1413
}
1414
1415
port = (uint16_t)tmpmax;
1416
*address = '\0';
1417
address = connect_to;
1418
/* Colon in address indicates IPv6 */
1419
int af;
1420
if(strchr(address, ':') != NULL){
1421
af = AF_INET6;
1422
} else {
1423
af = AF_INET;
1424
}
1425
1426
if(quit_now){
1427
goto end;
1428
}
1429
1430
ret = start_mandos_communication(address, port, if_index, af);
1431
if(ret < 0){
1432
exitcode = EXIT_FAILURE;
1433
} else {
1434
exitcode = EXIT_SUCCESS;
1435
}
1436
goto end;
1437
}
1438
1439
if(quit_now){
1440
goto end;
1441
}
1442
1443
{
1444
AvahiServerConfig config;
1445
/* Do not publish any local Zeroconf records */
1446
avahi_server_config_init(&config);
1447
config.publish_hinfo = 0;
1448
config.publish_addresses = 0;
1449
config.publish_workstation = 0;
1450
config.publish_domain = 0;
1451
1452
/* Allocate a new server */
1453
mc.server = avahi_server_new(avahi_simple_poll_get
1454
(mc.simple_poll), &config, NULL,
1455
NULL, &error);
1456
1457
/* Free the Avahi configuration data */
1458
avahi_server_config_free(&config);
1459
}
1460
1461
/* Check if creating the Avahi server object succeeded */
1462
if(mc.server == NULL){
1463
fprintf(stderr, "Failed to create Avahi server: %s\n",
1464
avahi_strerror(error));
1465
exitcode = EXIT_FAILURE;
1466
goto end;
1467
}
1468
1469
if(quit_now){
1470
goto end;
1471
}
1472
1473
/* Create the Avahi service browser */
1474
sb = avahi_s_service_browser_new(mc.server, if_index,
1475
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1476
NULL, 0, browse_callback, NULL);
1477
if(sb == NULL){
1478
fprintf(stderr, "Failed to create service browser: %s\n",
1479
avahi_strerror(avahi_server_errno(mc.server)));
1480
exitcode = EXIT_FAILURE;
1481
goto end;
1482
}
1483
1484
if(quit_now){
1485
goto end;
1486
}
1487
1488
/* Run the main loop */
1489
1490
if(debug){
1491
fprintf(stderr, "Starting Avahi loop search\n");
1492
}
1493
1494
avahi_simple_poll_loop(mc.simple_poll);
1495
940
exit(EXIT_FAILURE);
941
}
942
943
if(connect_to != NULL){
944
/* Connect directly, do not use Zeroconf */
945
/* (Mainly meant for debugging) */
946
char *address = strrchr(connect_to, ':');
947
if(address == NULL){
948
fprintf(stderr, "No colon in address\n");
949
exitcode = EXIT_FAILURE;
950
goto end;
951
}
952
errno = 0;
953
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
954
if(errno){
955
perror("Bad port number");
956
exitcode = EXIT_FAILURE;
957
goto end;
958
}
959
*address = '\0';
960
address = connect_to;
961
ret = start_mandos_communication(address, port, if_index, &mc);
962
if(ret < 0){
963
exitcode = EXIT_FAILURE;
964
} else {
965
exitcode = EXIT_SUCCESS;
966
}
967
goto end;
968
}
969
970
if (not debug){
971
avahi_set_log_function(empty_log);
972
}
973
974
/* Initialize the pseudo-RNG for Avahi */
975
srand((unsigned int) time(NULL));
976
977
/* Allocate main Avahi loop object */
978
mc.simple_poll = avahi_simple_poll_new();
979
if (mc.simple_poll == NULL) {
980
fprintf(stderr, "Avahi: Failed to create simple poll"
981
" object.\n");
982
exitcode = EXIT_FAILURE;
983
goto end;
984
}
985
986
{
987
AvahiServerConfig config;
988
/* Do not publish any local Zeroconf records */
989
avahi_server_config_init(&config);
990
config.publish_hinfo = 0;
991
config.publish_addresses = 0;
992
config.publish_workstation = 0;
993
config.publish_domain = 0;
994
995
/* Allocate a new server */
996
mc.server = avahi_server_new(avahi_simple_poll_get
997
(mc.simple_poll), &config, NULL,
998
NULL, &error);
999
1000
/* Free the Avahi configuration data */
1001
avahi_server_config_free(&config);
1002
}
1003
1004
/* Check if creating the Avahi server object succeeded */
1005
if (mc.server == NULL) {
1006
fprintf(stderr, "Failed to create Avahi server: %s\n",
1007
avahi_strerror(error));
1008
exitcode = EXIT_FAILURE;
1009
goto end;
1010
}
1011
1012
/* Create the Avahi service browser */
1013
sb = avahi_s_service_browser_new(mc.server, if_index,
1014
AVAHI_PROTO_INET6,
1015
"_mandos._tcp", NULL, 0,
1016
browse_callback, &mc);
1017
if (sb == NULL) {
1018
fprintf(stderr, "Failed to create service browser: %s\n",
1019
avahi_strerror(avahi_server_errno(mc.server)));
1020
exitcode = EXIT_FAILURE;
1021
goto end;
1022
}
1023
1024
/* Run the main loop */
1025
1026
if (debug){
1027
fprintf(stderr, "Starting Avahi loop search\n");
1028
}
1029
1030
avahi_simple_poll_loop(mc.simple_poll);
1031
1496
1032
end:
1497
1498
if(debug){
1499
fprintf(stderr, "%s exiting\n", argv[0]);
1500
}
1501
1502
/* Cleanup things */
1503
if(sb != NULL)
1504
avahi_s_service_browser_free(sb);
1505
1506
if(mc.server != NULL)
1507
avahi_server_free(mc.server);
1508
1509
if(mc.simple_poll != NULL)
1510
avahi_simple_poll_free(mc.simple_poll);
1511
1512
if(gnutls_initialized){
1513
gnutls_certificate_free_credentials(mc.cred);
1514
gnutls_global_deinit();
1515
gnutls_dh_params_deinit(mc.dh_params);
1516
}
1517
1518
if(gpgme_initialized){
1519
gpgme_release(mc.ctx);
1520
}
1521
1522
/* Take down the network interface */
1523
if(take_down_interface){
1524
/* Re-raise priviliges */
1525
errno = 0;
1526
ret = seteuid(0);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
1530
if(geteuid() == 0){
1531
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1532
if(ret == -1){
1533
perror("ioctl SIOCGIFFLAGS");
1534
} else if(network.ifr_flags & IFF_UP) {
1535
network.ifr_flags &= ~IFF_UP; /* clear flag */
1536
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1537
if(ret == -1){
1538
perror("ioctl SIOCSIFFLAGS");
1539
}
1540
}
1541
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1542
if(ret == -1){
1543
perror("close");
1544
}
1545
/* Lower privileges permanently */
1546
errno = 0;
1547
ret = setuid(uid);
1548
if(ret == -1){
1549
perror("setuid");
1550
}
1551
}
1552
}
1553
1554
/* Removes the temp directory used by GPGME */
1555
if(tempdir_created){
1556
DIR *d;
1557
struct dirent *direntry;
1558
d = opendir(tempdir);
1559
if(d == NULL){
1560
if(errno != ENOENT){
1561
perror("opendir");
1562
}
1563
} else {
1564
while(true){
1565
direntry = readdir(d);
1566
if(direntry == NULL){
1567
break;
1568
}
1569
/* Skip "." and ".." */
1570
if(direntry->d_name[0] == '.'
1571
and (direntry->d_name[1] == '\0'
1572
or (direntry->d_name[1] == '.'
1573
and direntry->d_name[2] == '\0'))){
1574
continue;
1575
}
1576
char *fullname = NULL;
1577
ret = asprintf(&fullname, "%s/%s", tempdir,
1578
direntry->d_name);
1579
if(ret < 0){
1580
perror("asprintf");
1581
continue;
1582
}
1583
ret = remove(fullname);
1584
if(ret == -1){
1585
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1586
strerror(errno));
1587
}
1588
free(fullname);
1589
}
1590
closedir(d);
1591
}
1592
ret = rmdir(tempdir);
1593
if(ret == -1 and errno != ENOENT){
1594
perror("rmdir");
1595
}
1596
}
1597
1598
if(quit_now){
1599
sigemptyset(&old_sigterm_action.sa_mask);
1600
old_sigterm_action.sa_handler = SIG_DFL;
1601
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1602
if(ret == -1){
1603
perror("sigaction");
1604
}
1605
raise(signal_received);
1606
}
1607
1608
return exitcode;
1033
1034
if (debug){
1035
fprintf(stderr, "%s exiting\n", argv[0]);
1036
}
1037
1038
/* Cleanup things */
1039
if (sb != NULL)
1040
avahi_s_service_browser_free(sb);
1041
1042
if (mc.server != NULL)
1043
avahi_server_free(mc.server);
1044
1045
if (mc.simple_poll != NULL)
1046
avahi_simple_poll_free(mc.simple_poll);
1047
free(pubkeyfile);
1048
free(seckeyfile);
1049
1050
if (gnutls_initalized){
1051
gnutls_certificate_free_credentials(mc.cred);
1052
gnutls_global_deinit ();
1053
}
1054
1055
return exitcode;
1609
1056
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0