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- Committer: Teddy Hogeborn
- Date: 2008-08-16 16:58:31 UTC
- Revision ID: teddy@fukt.bsnet.se-20080816165831-cx018vo5i9oqmgo0
* plugins.d/password-request.c (main): Include environment variables
"cryptsource" and "crypttarget"
in password prompt.
"cryptsource" and "crypttarget"
in password prompt.
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugins.d/password-request.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
36
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
36
38
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), remove() */
38
stdout, ferror() */
40
39
#include <stdint.h> /* uint16_t, uint32_t */
41
40
#include <stddef.h> /* NULL, size_t, ssize_t */
42
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand(), strtof() */
44
#include <stdbool.h> /* bool, false, true */
42
srand() */
43
#include <stdbool.h> /* bool, true */
45
44
#include <string.h> /* memset(), strcmp(), strlen(),
46
45
strerror(), asprintf(), strcpy() */
47
#include <sys/ioctl.h> /* ioctl */
46
#include <sys/ioctl.h> /* ioctl */
48
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
48
sockaddr_in6, PF_INET6,
50
SOCK_STREAM, uid_t, gid_t, open(),
51
opendir(), DIR */
52
#include <sys/stat.h> /* open() */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
53
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
inet_pton(), connect() */
55
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir()
57
*/
58
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
59
strtoimax() */
53
struct in6_addr, inet_pton(),
54
connect() */
60
55
#include <assert.h> /* assert() */
61
56
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
57
#include <time.h> /* time() */
63
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
64
59
SIOCSIFFLAGS, if_indextoname(),
65
60
if_nametoindex(), IF_NAMESIZE */
66
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
*/
69
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
62
getuid(), getgid(), setuid(),
71
63
setgid() */
64
#include <netinet/in.h>
72
65
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, or, and */
66
#include <iso646.h> /* not, and */
74
67
#include <argp.h> /* struct argp_option, error_t, struct
75
68
argp_state, struct argp,
76
69
argp_parse(), ARGP_KEY_ARG,
77
70
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
#include <signal.h> /* sigemptyset(), sigaddset(),
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
81
82
#ifdef __linux__
83
#include <sys/klog.h> /* klogctl() */
84
#endif /* __linux__ */
85
71
86
72
/* Avahi */
87
73
/* All Avahi types, constants and functions
100
86
gnutls_*
101
87
init_gnutls_session(),
102
88
GNUTLS_* */
103
#include <gnutls/openpgp.h>
104
/* gnutls_certificate_set_openpgp_key_file(),
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
105
90
GNUTLS_OPENPGP_FMT_BASE64 */
106
91
107
92
/* GPGME */
113
98
114
99
#define BUFFER_SIZE 256
115
100
116
#define PATHDIR "/conf/conf.d/mandos"
117
#define SECKEY "seckey.txt"
118
#define PUBKEY "pubkey.txt"
119
120
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
121
103
static const char mandos_protocol_version[] = "1";
122
const char *argp_program_version = "mandos-client " VERSION;
104
const char *argp_program_version = "password-request 1.0";
123
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
124
106
125
107
/* Used for passing in values through the Avahi callback functions */
130
112
unsigned int dh_bits;
131
113
gnutls_dh_params_t dh_params;
132
114
const char *priority;
133
gpgme_ctx_t ctx;
134
115
} mandos_context;
135
116
136
/* global context so signal handler can reach it*/
137
mandos_context mc = { .simple_poll = NULL, .server = NULL,
138
.dh_bits = 1024, .priority = "SECURE256"
139
":!CTYPE-X.509:+CTYPE-OPENPGP" };
140
141
117
/*
142
* Make additional room in "buffer" for at least BUFFER_SIZE more
143
* 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,
144
120
* "buffer_length" is how much is already used.
145
121
*/
146
size_t incbuffer(char **buffer, size_t buffer_length,
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
147
123
size_t buffer_capacity){
148
if(buffer_length + BUFFER_SIZE > buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
149
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
150
if(buffer == NULL){
126
if (buffer == NULL){
151
127
return 0;
152
128
}
153
129
buffer_capacity += BUFFER_SIZE;
156
132
}
157
133
158
134
/*
159
* Initialize GPGME.
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
160
137
*/
161
static bool init_gpgme(const char *seckey,
162
const char *pubkey, const char *tempdir){
163
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;
164
144
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
165
148
gpgme_engine_info_t engine_info;
166
149
167
168
/*
169
* Helper function to insert pub and seckey to the engine keyring.
170
*/
171
bool import_key(const char *filename){
172
int fd;
173
gpgme_data_t pgp_data;
174
175
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
176
if(fd == -1){
177
perror("open");
178
return false;
179
}
180
181
rc = gpgme_data_new_from_fd(&pgp_data, fd);
182
if(rc != GPG_ERR_NO_ERROR){
183
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
184
gpgme_strsource(rc), gpgme_strerror(rc));
185
return false;
186
}
187
188
rc = gpgme_op_import(mc.ctx, pgp_data);
189
if(rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
192
return false;
193
}
194
195
ret = (int)TEMP_FAILURE_RETRY(close(fd));
196
if(ret == -1){
197
perror("close");
198
}
199
gpgme_data_release(pgp_data);
200
return true;
201
}
202
203
if(debug){
204
fprintf(stderr, "Initializing GPGME\n");
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
205
152
}
206
153
207
154
/* Init GPGME */
208
155
gpgme_check_version(NULL);
209
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
210
if(rc != GPG_ERR_NO_ERROR){
157
if (rc != GPG_ERR_NO_ERROR){
211
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
212
159
gpgme_strsource(rc), gpgme_strerror(rc));
213
return false;
160
return -1;
214
161
}
215
162
216
/* Set GPGME home directory for the OpenPGP engine only */
217
rc = gpgme_get_engine_info(&engine_info);
218
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){
219
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
220
167
gpgme_strsource(rc), gpgme_strerror(rc));
221
return false;
168
return -1;
222
169
}
223
170
while(engine_info != NULL){
224
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
225
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
226
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
227
174
break;
228
175
}
229
176
engine_info = engine_info->next;
230
177
}
231
178
if(engine_info == NULL){
232
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
233
return false;
234
}
235
236
/* Create new GPGME "context" */
237
rc = gpgme_new(&(mc.ctx));
238
if(rc != GPG_ERR_NO_ERROR){
239
fprintf(stderr, "bad gpgme_new: %s: %s\n",
240
gpgme_strsource(rc), gpgme_strerror(rc));
241
return false;
242
}
243
244
if(not import_key(pubkey) or not import_key(seckey)){
245
return false;
246
}
247
248
return true;
249
}
250
251
/*
252
* Decrypt OpenPGP data.
253
* Returns -1 on error
254
*/
255
static ssize_t pgp_packet_decrypt(const char *cryptotext,
256
size_t crypto_size,
257
char **plaintext){
258
gpgme_data_t dh_crypto, dh_plain;
259
gpgme_error_t rc;
260
ssize_t ret;
261
size_t plaintext_capacity = 0;
262
ssize_t plaintext_length = 0;
263
264
if(debug){
265
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
266
181
}
267
182
268
183
/* Create new GPGME data buffer from memory cryptotext */
269
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
270
185
0);
271
if(rc != GPG_ERR_NO_ERROR){
186
if (rc != GPG_ERR_NO_ERROR){
272
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
273
188
gpgme_strsource(rc), gpgme_strerror(rc));
274
189
return -1;
276
191
277
192
/* Create new empty GPGME data buffer for the plaintext */
278
193
rc = gpgme_data_new(&dh_plain);
279
if(rc != GPG_ERR_NO_ERROR){
194
if (rc != GPG_ERR_NO_ERROR){
280
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
281
196
gpgme_strsource(rc), gpgme_strerror(rc));
282
197
gpgme_data_release(dh_crypto);
283
198
return -1;
284
199
}
285
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
286
210
/* Decrypt data from the cryptotext data buffer to the plaintext
287
211
data buffer */
288
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
289
if(rc != GPG_ERR_NO_ERROR){
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
290
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
291
215
gpgme_strsource(rc), gpgme_strerror(rc));
292
216
plaintext_length = -1;
293
if(debug){
294
gpgme_decrypt_result_t result;
295
result = gpgme_op_decrypt_result(mc.ctx);
296
if(result == NULL){
297
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
298
} else {
299
fprintf(stderr, "Unsupported algorithm: %s\n",
300
result->unsupported_algorithm);
301
fprintf(stderr, "Wrong key usage: %u\n",
302
result->wrong_key_usage);
303
if(result->file_name != NULL){
304
fprintf(stderr, "File name: %s\n", result->file_name);
305
}
306
gpgme_recipient_t recipient;
307
recipient = result->recipients;
308
if(recipient){
309
while(recipient != NULL){
310
fprintf(stderr, "Public key algorithm: %s\n",
311
gpgme_pubkey_algo_name(recipient->pubkey_algo));
312
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
313
fprintf(stderr, "Secret key available: %s\n",
314
recipient->status == GPG_ERR_NO_SECKEY
315
? "No" : "Yes");
316
recipient = recipient->next;
317
}
318
}
319
}
320
}
321
217
goto decrypt_end;
322
218
}
323
219
325
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
326
222
}
327
223
224
if (debug){
225
gpgme_decrypt_result_t result;
226
result = gpgme_op_decrypt_result(ctx);
227
if (result == NULL){
228
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
229
} else {
230
fprintf(stderr, "Unsupported algorithm: %s\n",
231
result->unsupported_algorithm);
232
fprintf(stderr, "Wrong key usage: %u\n",
233
result->wrong_key_usage);
234
if(result->file_name != NULL){
235
fprintf(stderr, "File name: %s\n", result->file_name);
236
}
237
gpgme_recipient_t recipient;
238
recipient = result->recipients;
239
if(recipient){
240
while(recipient != NULL){
241
fprintf(stderr, "Public key algorithm: %s\n",
242
gpgme_pubkey_algo_name(recipient->pubkey_algo));
243
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
244
fprintf(stderr, "Secret key available: %s\n",
245
recipient->status == GPG_ERR_NO_SECKEY
246
? "No" : "Yes");
247
recipient = recipient->next;
248
}
249
}
250
}
251
}
252
328
253
/* Seek back to the beginning of the GPGME plaintext data buffer */
329
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
330
perror("gpgme_data_seek");
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
331
256
plaintext_length = -1;
332
257
goto decrypt_end;
333
258
}
334
259
335
260
*plaintext = NULL;
336
261
while(true){
337
plaintext_capacity = incbuffer(plaintext,
262
plaintext_capacity = adjustbuffer(plaintext,
338
263
(size_t)plaintext_length,
339
264
plaintext_capacity);
340
if(plaintext_capacity == 0){
341
perror("incbuffer");
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
342
267
plaintext_length = -1;
343
268
goto decrypt_end;
344
269
}
346
271
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
347
272
BUFFER_SIZE);
348
273
/* Print the data, if any */
349
if(ret == 0){
274
if (ret == 0){
350
275
/* EOF */
351
276
break;
352
277
}
357
282
}
358
283
plaintext_length += ret;
359
284
}
360
285
361
286
if(debug){
362
287
fprintf(stderr, "Decrypted password is: ");
363
288
for(ssize_t i = 0; i < plaintext_length; i++){
376
301
return plaintext_length;
377
302
}
378
303
379
static const char * safer_gnutls_strerror(int value){
380
const char *ret = gnutls_strerror(value); /* Spurious warning from
381
-Wunreachable-code */
382
if(ret == NULL)
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value);
306
if (ret == NULL)
383
307
ret = "(unknown)";
384
308
return ret;
385
309
}
390
314
fprintf(stderr, "GnuTLS: %s", string);
391
315
}
392
316
393
static int init_gnutls_global(const char *pubkeyfilename,
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfilename,
394
319
const char *seckeyfilename){
395
320
int ret;
396
321
399
324
}
400
325
401
326
ret = gnutls_global_init();
402
if(ret != GNUTLS_E_SUCCESS){
403
fprintf(stderr, "GnuTLS global_init: %s\n",
404
safer_gnutls_strerror(ret));
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
405
330
return -1;
406
331
}
407
332
408
if(debug){
333
if (debug){
409
334
/* "Use a log level over 10 to enable all debugging options."
410
335
* - GnuTLS manual
411
336
*/
414
339
}
415
340
416
341
/* OpenPGP credentials */
417
gnutls_certificate_allocate_credentials(&mc.cred);
418
if(ret != GNUTLS_E_SUCCESS){
419
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
from
421
-Wunreachable-code
422
*/
423
safer_gnutls_strerror(ret));
424
gnutls_global_deinit();
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
425
347
return -1;
426
348
}
427
349
428
350
if(debug){
429
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
430
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
431
353
seckeyfilename);
432
354
}
433
355
434
356
ret = gnutls_certificate_set_openpgp_key_file
435
(mc.cred, pubkeyfilename, seckeyfilename,
357
(mc->cred, pubkeyfilename, seckeyfilename,
436
358
GNUTLS_OPENPGP_FMT_BASE64);
437
if(ret != GNUTLS_E_SUCCESS){
359
if (ret != GNUTLS_E_SUCCESS) {
438
360
fprintf(stderr,
439
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
440
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
441
fprintf(stderr, "The GnuTLS error is: %s\n",
363
fprintf(stdout, "The GnuTLS error is: %s\n",
442
364
safer_gnutls_strerror(ret));
443
365
goto globalfail;
444
366
}
445
367
446
368
/* GnuTLS server initialization */
447
ret = gnutls_dh_params_init(&mc.dh_params);
448
if(ret != GNUTLS_E_SUCCESS){
449
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
450
" %s\n", safer_gnutls_strerror(ret));
451
goto globalfail;
452
}
453
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
454
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
456
safer_gnutls_strerror(ret));
457
goto globalfail;
458
}
459
460
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
461
369
ret = gnutls_dh_params_init(&mc->dh_params);
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
373
goto globalfail;
374
}
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
379
goto globalfail;
380
}
381
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
383
462
384
return 0;
463
385
464
386
globalfail:
465
466
gnutls_certificate_free_credentials(mc.cred);
387
388
gnutls_certificate_free_credentials(mc->cred);
467
389
gnutls_global_deinit();
468
gnutls_dh_params_deinit(mc.dh_params);
469
390
return -1;
391
470
392
}
471
393
472
static int init_gnutls_session(gnutls_session_t *session){
394
static int init_gnutls_session(mandos_context *mc,
395
gnutls_session_t *session){
473
396
int ret;
474
397
/* GnuTLS session creation */
475
398
ret = gnutls_init(session, GNUTLS_SERVER);
476
if(ret != GNUTLS_E_SUCCESS){
399
if (ret != GNUTLS_E_SUCCESS){
477
400
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
478
401
safer_gnutls_strerror(ret));
479
402
}
480
403
481
404
{
482
405
const char *err;
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
484
if(ret != GNUTLS_E_SUCCESS){
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
407
if (ret != GNUTLS_E_SUCCESS) {
485
408
fprintf(stderr, "Syntax error at: %s\n", err);
486
409
fprintf(stderr, "GnuTLS error: %s\n",
487
410
safer_gnutls_strerror(ret));
488
gnutls_deinit(*session);
411
gnutls_deinit (*session);
489
412
return -1;
490
413
}
491
414
}
492
415
493
416
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
494
mc.cred);
495
if(ret != GNUTLS_E_SUCCESS){
417
mc->cred);
418
if (ret != GNUTLS_E_SUCCESS) {
496
419
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
497
420
safer_gnutls_strerror(ret));
498
gnutls_deinit(*session);
421
gnutls_deinit (*session);
499
422
return -1;
500
423
}
501
424
502
425
/* ignore client certificate if any. */
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
505
428
506
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
507
430
508
431
return 0;
509
432
}
515
438
/* Called when a Mandos server is found */
516
439
static int start_mandos_communication(const char *ip, uint16_t port,
517
440
AvahiIfIndex if_index,
518
int af){
441
mandos_context *mc){
519
442
int ret, tcp_sd;
520
ssize_t sret;
521
union {
522
struct sockaddr_in in;
523
struct sockaddr_in6 in6;
524
} to;
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
525
444
char *buffer = NULL;
526
445
char *decrypted_buffer;
527
446
size_t buffer_length = 0;
529
448
ssize_t decrypted_buffer_size;
530
449
size_t written;
531
450
int retval = 0;
451
char interface[IF_NAMESIZE];
532
452
gnutls_session_t session;
533
int pf; /* Protocol family */
534
535
switch(af){
536
case AF_INET6:
537
pf = PF_INET6;
538
break;
539
case AF_INET:
540
pf = PF_INET;
541
break;
542
default:
543
fprintf(stderr, "Bad address family: %d\n", af);
544
return -1;
545
}
546
547
ret = init_gnutls_session(&session);
548
if(ret != 0){
453
454
ret = init_gnutls_session (mc, &session);
455
if (ret != 0){
549
456
return -1;
550
457
}
551
458
552
459
if(debug){
553
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
460
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
554
461
"\n", ip, port);
555
462
}
556
463
557
tcp_sd = socket(pf, SOCK_STREAM, 0);
558
if(tcp_sd < 0){
464
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
465
if(tcp_sd < 0) {
559
466
perror("socket");
560
467
return -1;
561
468
}
469
470
if(debug){
471
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
perror("if_indextoname");
473
return -1;
474
}
475
fprintf(stderr, "Binding to interface %s\n", interface);
476
}
562
477
563
memset(&to, 0, sizeof(to));
564
if(af == AF_INET6){
565
to.in6.sin6_family = (uint16_t)af;
566
ret = inet_pton(af, ip, &to.in6.sin6_addr);
567
} else { /* IPv4 */
568
to.in.sin_family = (sa_family_t)af;
569
ret = inet_pton(af, ip, &to.in.sin_addr);
570
}
571
if(ret < 0 ){
478
memset(&to, 0, sizeof(to)); /* Spurious warning */
479
to.in6.sin6_family = AF_INET6;
480
/* It would be nice to have a way to detect if we were passed an
481
IPv4 address here. Now we assume an IPv6 address. */
482
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
483
if (ret < 0 ){
572
484
perror("inet_pton");
573
485
return -1;
574
486
}
576
488
fprintf(stderr, "Bad address: %s\n", ip);
577
489
return -1;
578
490
}
579
if(af == AF_INET6){
580
to.in6.sin6_port = htons(port); /* Spurious warnings from
581
-Wconversion and
582
-Wunreachable-code */
583
584
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
585
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
586
-Wunreachable-code*/
587
if(if_index == AVAHI_IF_UNSPEC){
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
589
" without a network interface\n");
590
return -1;
591
}
592
/* Set the network interface number as scope */
593
to.in6.sin6_scope_id = (uint32_t)if_index;
594
}
595
} else {
596
to.in.sin_port = htons(port); /* Spurious warnings from
597
-Wconversion and
598
-Wunreachable-code */
599
}
491
to.in6.sin6_port = htons(port); /* Spurious warning */
492
493
to.in6.sin6_scope_id = (uint32_t)if_index;
600
494
601
495
if(debug){
602
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
603
char interface[IF_NAMESIZE];
604
if(if_indextoname((unsigned int)if_index, interface) == NULL){
605
perror("if_indextoname");
606
} else {
607
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
608
ip, interface, port);
609
}
610
} else {
611
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
612
port);
613
}
614
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
615
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
616
const char *pcret;
617
if(af == AF_INET6){
618
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
619
sizeof(addrstr));
620
} else {
621
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
622
sizeof(addrstr));
623
}
624
if(pcret == NULL){
496
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
497
port);
498
char addrstr[INET6_ADDRSTRLEN] = "";
499
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
500
sizeof(addrstr)) == NULL){
625
501
perror("inet_ntop");
626
502
} else {
627
503
if(strcmp(addrstr, ip) != 0){
630
506
}
631
507
}
632
508
633
if(af == AF_INET6){
634
ret = connect(tcp_sd, &to.in6, sizeof(to));
635
} else {
636
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
637
}
638
if(ret < 0){
509
ret = connect(tcp_sd, &to.in, sizeof(to));
510
if (ret < 0){
639
511
perror("connect");
640
512
return -1;
641
513
}
642
514
643
515
const char *out = mandos_protocol_version;
644
516
written = 0;
645
while(true){
517
while (true){
646
518
size_t out_size = strlen(out);
647
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
648
520
out_size - written));
649
if(ret == -1){
521
if (ret == -1){
650
522
perror("write");
651
523
retval = -1;
652
524
goto mandos_end;
655
527
if(written < out_size){
656
528
continue;
657
529
} else {
658
if(out == mandos_protocol_version){
530
if (out == mandos_protocol_version){
659
531
written = 0;
660
532
out = "\r\n";
661
533
} else {
663
535
}
664
536
}
665
537
}
666
538
667
539
if(debug){
668
540
fprintf(stderr, "Establishing TLS session with %s\n", ip);
669
541
}
670
542
671
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
672
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
673
545
do{
674
ret = gnutls_handshake(session);
546
ret = gnutls_handshake (session);
675
547
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
676
548
677
if(ret != GNUTLS_E_SUCCESS){
549
if (ret != GNUTLS_E_SUCCESS){
678
550
if(debug){
679
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
680
gnutls_perror(ret);
552
gnutls_perror (ret);
681
553
}
682
554
retval = -1;
683
555
goto mandos_end;
686
558
/* Read OpenPGP packet that contains the wanted password */
687
559
688
560
if(debug){
689
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
690
562
ip);
691
563
}
692
564
693
565
while(true){
694
buffer_capacity = incbuffer(&buffer, buffer_length,
566
buffer_capacity = adjustbuffer(&buffer, buffer_length,
695
567
buffer_capacity);
696
if(buffer_capacity == 0){
697
perror("incbuffer");
568
if (buffer_capacity == 0){
569
perror("adjustbuffer");
698
570
retval = -1;
699
571
goto mandos_end;
700
572
}
701
573
702
sret = gnutls_record_recv(session, buffer+buffer_length,
703
BUFFER_SIZE);
704
if(sret == 0){
574
ret = gnutls_record_recv(session, buffer+buffer_length,
575
BUFFER_SIZE);
576
if (ret == 0){
705
577
break;
706
578
}
707
if(sret < 0){
708
switch(sret){
579
if (ret < 0){
580
switch(ret){
709
581
case GNUTLS_E_INTERRUPTED:
710
582
case GNUTLS_E_AGAIN:
711
583
break;
712
584
case GNUTLS_E_REHANDSHAKE:
713
585
do{
714
ret = gnutls_handshake(session);
586
ret = gnutls_handshake (session);
715
587
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
716
if(ret < 0){
588
if (ret < 0){
717
589
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
718
gnutls_perror(ret);
590
gnutls_perror (ret);
719
591
retval = -1;
720
592
goto mandos_end;
721
593
}
724
596
fprintf(stderr, "Unknown error while reading data from"
725
597
" encrypted session with Mandos server\n");
726
598
retval = -1;
727
gnutls_bye(session, GNUTLS_SHUT_RDWR);
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
728
600
goto mandos_end;
729
601
}
730
602
} else {
731
buffer_length += (size_t) sret;
603
buffer_length += (size_t) ret;
732
604
}
733
605
}
734
606
736
608
fprintf(stderr, "Closing TLS session\n");
737
609
}
738
610
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
740
612
741
if(buffer_length > 0){
613
if (buffer_length > 0){
742
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
743
615
buffer_length,
744
&decrypted_buffer);
745
if(decrypted_buffer_size >= 0){
616
&decrypted_buffer,
617
keydir);
618
if (decrypted_buffer_size >= 0){
746
619
written = 0;
747
620
while(written < (size_t) decrypted_buffer_size){
748
ret = (int)fwrite(decrypted_buffer + written, 1,
749
(size_t)decrypted_buffer_size - written,
750
stdout);
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
751
624
if(ret == 0 and ferror(stdout)){
752
625
if(debug){
753
626
fprintf(stderr, "Error writing encrypted data: %s\n",
762
635
} else {
763
636
retval = -1;
764
637
}
765
} else {
766
retval = -1;
767
638
}
768
639
769
640
/* Shutdown procedure */
770
641
771
642
mandos_end:
772
643
free(buffer);
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
774
if(ret == -1){
775
perror("close");
776
}
777
gnutls_deinit(session);
644
close(tcp_sd);
645
gnutls_deinit (session);
778
646
return retval;
779
647
}
780
648
781
649
static void resolve_callback(AvahiSServiceResolver *r,
782
650
AvahiIfIndex interface,
783
AvahiProtocol proto,
651
AVAHI_GCC_UNUSED AvahiProtocol protocol,
784
652
AvahiResolverEvent event,
785
653
const char *name,
786
654
const char *type,
791
659
AVAHI_GCC_UNUSED AvahiStringList *txt,
792
660
AVAHI_GCC_UNUSED AvahiLookupResultFlags
793
661
flags,
794
AVAHI_GCC_UNUSED void* userdata){
795
assert(r);
662
void* userdata) {
663
mandos_context *mc = userdata;
664
assert(r); /* Spurious warning */
796
665
797
666
/* Called whenever a service has been resolved successfully or
798
667
timed out */
799
668
800
switch(event){
669
switch (event) {
801
670
default:
802
671
case AVAHI_RESOLVER_FAILURE:
803
672
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
804
673
" of type '%s' in domain '%s': %s\n", name, type, domain,
805
avahi_strerror(avahi_server_errno(mc.server)));
674
avahi_strerror(avahi_server_errno(mc->server)));
806
675
break;
807
676
808
677
case AVAHI_RESOLVER_FOUND:
811
680
avahi_address_snprint(ip, sizeof(ip), address);
812
681
if(debug){
813
682
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
814
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
815
ip, (intmax_t)interface, port);
683
PRIu16 ") on port %d\n", name, host_name, ip,
684
interface, port);
816
685
}
817
int ret = start_mandos_communication(ip, port, interface,
818
avahi_proto_to_af(proto));
819
if(ret == 0){
820
avahi_simple_poll_quit(mc.simple_poll);
686
int ret = start_mandos_communication(ip, port, interface, mc);
687
if (ret == 0){
688
avahi_simple_poll_quit(mc->simple_poll);
821
689
}
822
690
}
823
691
}
824
692
avahi_s_service_resolver_free(r);
825
693
}
826
694
827
static void browse_callback(AvahiSServiceBrowser *b,
828
AvahiIfIndex interface,
829
AvahiProtocol protocol,
830
AvahiBrowserEvent event,
831
const char *name,
832
const char *type,
833
const char *domain,
834
AVAHI_GCC_UNUSED AvahiLookupResultFlags
835
flags,
836
AVAHI_GCC_UNUSED void* userdata){
837
assert(b);
695
static void browse_callback( AvahiSServiceBrowser *b,
696
AvahiIfIndex interface,
697
AvahiProtocol protocol,
698
AvahiBrowserEvent event,
699
const char *name,
700
const char *type,
701
const char *domain,
702
AVAHI_GCC_UNUSED AvahiLookupResultFlags
703
flags,
704
void* userdata) {
705
mandos_context *mc = userdata;
706
assert(b); /* Spurious warning */
838
707
839
708
/* Called whenever a new services becomes available on the LAN or
840
709
is removed from the LAN */
841
710
842
switch(event){
711
switch (event) {
843
712
default:
844
713
case AVAHI_BROWSER_FAILURE:
845
714
846
715
fprintf(stderr, "(Avahi browser) %s\n",
847
avahi_strerror(avahi_server_errno(mc.server)));
848
avahi_simple_poll_quit(mc.simple_poll);
716
avahi_strerror(avahi_server_errno(mc->server)));
717
avahi_simple_poll_quit(mc->simple_poll);
849
718
return;
850
719
851
720
case AVAHI_BROWSER_NEW:
854
723
the callback function is called the Avahi server will free the
855
724
resolver for us. */
856
725
857
if(!(avahi_s_service_resolver_new(mc.server, interface,
726
if (!(avahi_s_service_resolver_new(mc->server, interface,
858
727
protocol, name, type, domain,
859
728
AVAHI_PROTO_INET6, 0,
860
resolve_callback, NULL)))
729
resolve_callback, mc)))
861
730
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
862
name, avahi_strerror(avahi_server_errno(mc.server)));
731
name, avahi_strerror(avahi_server_errno(mc->server)));
863
732
break;
864
733
865
734
case AVAHI_BROWSER_REMOVE:
874
743
}
875
744
}
876
745
877
sig_atomic_t quit_now = 0;
878
879
/* stop main loop after sigterm has been called */
880
static void handle_sigterm(__attribute__((unused)) int sig){
881
if(quit_now){
882
return;
883
}
884
quit_now = 1;
885
int old_errno = errno;
886
if(mc.simple_poll != NULL){
887
avahi_simple_poll_quit(mc.simple_poll);
888
}
889
errno = old_errno;
746
/* Combines file name and path and returns the malloced new
747
string. some sane checks could/should be added */
748
static char *combinepath(const char *first, const char *second){
749
char *tmp;
750
int ret = asprintf(&tmp, "%s/%s", first, second);
751
if(ret < 0){
752
return NULL;
753
}
754
return tmp;
890
755
}
891
756
757
892
758
int main(int argc, char *argv[]){
893
AvahiSServiceBrowser *sb = NULL;
894
int error;
895
int ret;
896
intmax_t tmpmax;
897
char *tmp;
898
int exitcode = EXIT_SUCCESS;
899
const char *interface = "eth0";
900
struct ifreq network;
901
int sd;
902
uid_t uid;
903
gid_t gid;
904
char *connect_to = NULL;
905
char tempdir[] = "/tmp/mandosXXXXXX";
906
bool tempdir_created = false;
907
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
908
const char *seckey = PATHDIR "/" SECKEY;
909
const char *pubkey = PATHDIR "/" PUBKEY;
910
911
/* Initialize Mandos context */
912
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
913
.dh_bits = 1024, .priority = "SECURE256"
914
":!CTYPE-X.509:+CTYPE-OPENPGP" };
915
bool gnutls_initialized = false;
916
bool gpgme_initialized = false;
917
float delay = 2.5f;
918
919
struct sigaction old_sigterm_action;
920
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
921
922
{
923
struct argp_option options[] = {
924
{ .name = "debug", .key = 128,
925
.doc = "Debug mode", .group = 3 },
926
{ .name = "connect", .key = 'c',
927
.arg = "ADDRESS:PORT",
928
.doc = "Connect directly to a specific Mandos server",
929
.group = 1 },
930
{ .name = "interface", .key = 'i',
931
.arg = "NAME",
932
.doc = "Network interface that will be used to search for"
933
" Mandos servers",
934
.group = 1 },
935
{ .name = "seckey", .key = 's',
936
.arg = "FILE",
937
.doc = "OpenPGP secret key file base name",
938
.group = 1 },
939
{ .name = "pubkey", .key = 'p',
940
.arg = "FILE",
941
.doc = "OpenPGP public key file base name",
942
.group = 2 },
943
{ .name = "dh-bits", .key = 129,
944
.arg = "BITS",
945
.doc = "Bit length of the prime number used in the"
946
" Diffie-Hellman key exchange",
947
.group = 2 },
948
{ .name = "priority", .key = 130,
949
.arg = "STRING",
950
.doc = "GnuTLS priority string for the TLS handshake",
951
.group = 1 },
952
{ .name = "delay", .key = 131,
953
.arg = "SECONDS",
954
.doc = "Maximum delay to wait for interface startup",
955
.group = 2 },
956
{ .name = NULL }
957
};
958
959
error_t parse_opt(int key, char *arg,
960
struct argp_state *state){
961
switch(key){
962
case 128: /* --debug */
963
debug = true;
964
break;
965
case 'c': /* --connect */
966
connect_to = arg;
967
break;
968
case 'i': /* --interface */
969
interface = arg;
970
break;
971
case 's': /* --seckey */
972
seckey = arg;
973
break;
974
case 'p': /* --pubkey */
975
pubkey = arg;
976
break;
977
case 129: /* --dh-bits */
978
errno = 0;
979
tmpmax = strtoimax(arg, &tmp, 10);
980
if(errno != 0 or tmp == arg or *tmp != '\0'
981
or tmpmax != (typeof(mc.dh_bits))tmpmax){
982
fprintf(stderr, "Bad number of DH bits\n");
983
exit(EXIT_FAILURE);
984
}
985
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
986
break;
987
case 130: /* --priority */
988
mc.priority = arg;
989
break;
990
case 131: /* --delay */
991
errno = 0;
992
delay = strtof(arg, &tmp);
993
if(errno != 0 or tmp == arg or *tmp != '\0'){
994
fprintf(stderr, "Bad delay\n");
995
exit(EXIT_FAILURE);
996
}
997
break;
998
case ARGP_KEY_ARG:
999
argp_usage(state);
1000
case ARGP_KEY_END:
1001
break;
1002
default:
1003
return ARGP_ERR_UNKNOWN;
1004
}
1005
return 0;
1006
}
1007
1008
struct argp argp = { .options = options, .parser = parse_opt,
1009
.args_doc = "",
1010
.doc = "Mandos client -- Get and decrypt"
1011
" passwords from a Mandos server" };
1012
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1013
if(ret == ARGP_ERR_UNKNOWN){
1014
fprintf(stderr, "Unknown error while parsing arguments\n");
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1017
}
1018
}
1019
1020
if(not debug){
1021
avahi_set_log_function(empty_log);
1022
}
1023
1024
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1025
from the signal handler */
1026
/* Initialize the pseudo-RNG for Avahi */
1027
srand((unsigned int) time(NULL));
1028
mc.simple_poll = avahi_simple_poll_new();
1029
if(mc.simple_poll == NULL){
1030
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1031
exitcode = EXIT_FAILURE;
1032
goto end;
1033
}
1034
1035
sigemptyset(&sigterm_action.sa_mask);
1036
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1037
if(ret == -1){
1038
perror("sigaddset");
1039
exitcode = EXIT_FAILURE;
1040
goto end;
1041
}
1042
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1043
if(ret == -1){
1044
perror("sigaddset");
1045
exitcode = EXIT_FAILURE;
1046
goto end;
1047
}
1048
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1049
if(ret == -1){
1050
perror("sigaddset");
1051
exitcode = EXIT_FAILURE;
1052
goto end;
1053
}
1054
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1055
if(ret == -1){
1056
perror("sigaction");
1057
exitcode = EXIT_FAILURE;
1058
goto end;
1059
}
1060
1061
/* If the interface is down, bring it up */
1062
if(interface[0] != '\0'){
1063
#ifdef __linux__
1064
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1065
messages to mess up the prompt */
1066
ret = klogctl(8, NULL, 5);
1067
bool restore_loglevel = true;
1068
if(ret == -1){
1069
restore_loglevel = false;
1070
perror("klogctl");
1071
}
1072
#endif /* __linux__ */
1073
1074
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1075
if(sd < 0){
1076
perror("socket");
1077
exitcode = EXIT_FAILURE;
1078
#ifdef __linux__
1079
if(restore_loglevel){
1080
ret = klogctl(7, NULL, 0);
1081
if(ret == -1){
1082
perror("klogctl");
1083
}
1084
}
1085
#endif /* __linux__ */
1086
goto end;
1087
}
1088
strcpy(network.ifr_name, interface);
1089
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1090
if(ret == -1){
1091
perror("ioctl SIOCGIFFLAGS");
1092
#ifdef __linux__
1093
if(restore_loglevel){
1094
ret = klogctl(7, NULL, 0);
1095
if(ret == -1){
1096
perror("klogctl");
1097
}
1098
}
1099
#endif /* __linux__ */
1100
exitcode = EXIT_FAILURE;
1101
goto end;
1102
}
1103
if((network.ifr_flags & IFF_UP) == 0){
1104
network.ifr_flags |= IFF_UP;
1105
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1106
if(ret == -1){
1107
perror("ioctl SIOCSIFFLAGS");
1108
exitcode = EXIT_FAILURE;
1109
#ifdef __linux__
1110
if(restore_loglevel){
1111
ret = klogctl(7, NULL, 0);
1112
if(ret == -1){
1113
perror("klogctl");
759
AvahiSServiceBrowser *sb = NULL;
760
int error;
761
int ret;
762
int exitcode = EXIT_SUCCESS;
763
const char *interface = "eth0";
764
struct ifreq network;
765
int sd;
766
uid_t uid;
767
gid_t gid;
768
char *connect_to = NULL;
769
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
770
char *pubkeyfilename = NULL;
771
char *seckeyfilename = NULL;
772
const char *pubkeyname = "pubkey.txt";
773
const char *seckeyname = "seckey.txt";
774
mandos_context mc = { .simple_poll = NULL, .server = NULL,
775
.dh_bits = 1024, .priority = "SECURE256"};
776
bool gnutls_initalized = false;
777
778
{
779
struct argp_option options[] = {
780
{ .name = "debug", .key = 128,
781
.doc = "Debug mode", .group = 3 },
782
{ .name = "connect", .key = 'c',
783
.arg = "IP",
784
.doc = "Connect directly to a sepcified mandos server",
785
.group = 1 },
786
{ .name = "interface", .key = 'i',
787
.arg = "INTERFACE",
788
.doc = "Interface that Avahi will conntect through",
789
.group = 1 },
790
{ .name = "keydir", .key = 'd',
791
.arg = "KEYDIR",
792
.doc = "Directory where the openpgp keyring is",
793
.group = 1 },
794
{ .name = "seckey", .key = 's',
795
.arg = "SECKEY",
796
.doc = "Secret openpgp key for gnutls authentication",
797
.group = 1 },
798
{ .name = "pubkey", .key = 'p',
799
.arg = "PUBKEY",
800
.doc = "Public openpgp key for gnutls authentication",
801
.group = 2 },
802
{ .name = "dh-bits", .key = 129,
803
.arg = "BITS",
804
.doc = "dh-bits to use in gnutls communication",
805
.group = 2 },
806
{ .name = "priority", .key = 130,
807
.arg = "PRIORITY",
808
.doc = "GNUTLS priority", .group = 1 },
809
{ .name = NULL }
810
};
811
812
813
error_t parse_opt (int key, char *arg,
814
struct argp_state *state) {
815
/* Get the INPUT argument from `argp_parse', which we know is
816
a pointer to our plugin list pointer. */
817
switch (key) {
818
case 128:
819
debug = true;
820
break;
821
case 'c':
822
connect_to = arg;
823
break;
824
case 'i':
825
interface = arg;
826
break;
827
case 'd':
828
keydir = arg;
829
break;
830
case 's':
831
seckeyname = arg;
832
break;
833
case 'p':
834
pubkeyname = arg;
835
break;
836
case 129:
837
errno = 0;
838
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
839
if (errno){
840
perror("strtol");
841
exit(EXIT_FAILURE);
1114
842
}
843
break;
844
case 130:
845
mc.priority = arg;
846
break;
847
case ARGP_KEY_ARG:
848
argp_usage (state);
849
case ARGP_KEY_END:
850
break;
851
default:
852
return ARGP_ERR_UNKNOWN;
1115
853
}
1116
#endif /* __linux__ */
1117
goto end;
1118
}
1119
}
1120
/* sleep checking until interface is running */
1121
for(int i=0; i < delay * 4; i++){
854
return 0;
855
}
856
857
struct argp argp = { .options = options, .parser = parse_opt,
858
.args_doc = "",
859
.doc = "Mandos client -- Get and decrypt"
860
" passwords from mandos server" };
861
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
862
if (ret == ARGP_ERR_UNKNOWN){
863
fprintf(stderr, "Unknown error while parsing arguments\n");
864
exitcode = EXIT_FAILURE;
865
goto end;
866
}
867
}
868
869
pubkeyfilename = combinepath(keydir, pubkeyname);
870
if (pubkeyfilename == NULL){
871
perror("combinepath");
872
exitcode = EXIT_FAILURE;
873
goto end;
874
}
875
876
seckeyfilename = combinepath(keydir, seckeyname);
877
if (seckeyfilename == NULL){
878
perror("combinepath");
879
exitcode = EXIT_FAILURE;
880
goto end;
881
}
882
883
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
884
if (ret == -1){
885
fprintf(stderr, "init_gnutls_global failed\n");
886
exitcode = EXIT_FAILURE;
887
goto end;
888
} else {
889
gnutls_initalized = true;
890
}
891
892
/* If the interface is down, bring it up */
893
{
894
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
895
if(sd < 0) {
896
perror("socket");
897
exitcode = EXIT_FAILURE;
898
goto end;
899
}
900
strcpy(network.ifr_name, interface); /* Spurious warning */
1122
901
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1123
902
if(ret == -1){
1124
903
perror("ioctl SIOCGIFFLAGS");
1125
} else if(network.ifr_flags & IFF_RUNNING){
1126
break;
1127
}
1128
struct timespec sleeptime = { .tv_nsec = 250000000 };
1129
ret = nanosleep(&sleeptime, NULL);
1130
if(ret == -1 and errno != EINTR){
1131
perror("nanosleep");
1132
}
1133
}
1134
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1135
if(ret == -1){
1136
perror("close");
1137
}
1138
#ifdef __linux__
1139
if(restore_loglevel){
1140
/* Restores kernel loglevel to default */
1141
ret = klogctl(7, NULL, 0);
1142
if(ret == -1){
1143
perror("klogctl");
1144
}
1145
}
1146
#endif /* __linux__ */
1147
}
1148
1149
uid = getuid();
1150
gid = getgid();
1151
1152
errno = 0;
1153
setgid(gid);
1154
if(ret == -1){
1155
perror("setgid");
1156
}
1157
1158
ret = setuid(uid);
1159
if(ret == -1){
1160
perror("setuid");
1161
}
1162
1163
ret = init_gnutls_global(pubkey, seckey);
1164
if(ret == -1){
1165
fprintf(stderr, "init_gnutls_global failed\n");
1166
exitcode = EXIT_FAILURE;
1167
goto end;
1168
} else {
1169
gnutls_initialized = true;
1170
}
1171
1172
if(mkdtemp(tempdir) == NULL){
1173
perror("mkdtemp");
1174
goto end;
1175
}
1176
tempdir_created = true;
1177
1178
if(not init_gpgme(pubkey, seckey, tempdir)){
1179
fprintf(stderr, "init_gpgme failed\n");
1180
exitcode = EXIT_FAILURE;
1181
goto end;
1182
} else {
1183
gpgme_initialized = true;
1184
}
1185
1186
if(interface[0] != '\0'){
904
exitcode = EXIT_FAILURE;
905
goto end;
906
}
907
if((network.ifr_flags & IFF_UP) == 0){
908
network.ifr_flags |= IFF_UP;
909
ret = ioctl(sd, SIOCSIFFLAGS, &network);
910
if(ret == -1){
911
perror("ioctl SIOCSIFFLAGS");
912
exitcode = EXIT_FAILURE;
913
goto end;
914
}
915
}
916
close(sd);
917
}
918
919
uid = getuid();
920
gid = getgid();
921
922
ret = setuid(uid);
923
if (ret == -1){
924
perror("setuid");
925
}
926
927
setgid(gid);
928
if (ret == -1){
929
perror("setgid");
930
}
931
1187
932
if_index = (AvahiIfIndex) if_nametoindex(interface);
1188
933
if(if_index == 0){
1189
934
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1190
exitcode = EXIT_FAILURE;
1191
goto end;
1192
}
1193
}
1194
1195
if(connect_to != NULL){
1196
/* Connect directly, do not use Zeroconf */
1197
/* (Mainly meant for debugging) */
1198
char *address = strrchr(connect_to, ':');
1199
if(address == NULL){
1200
fprintf(stderr, "No colon in address\n");
1201
exitcode = EXIT_FAILURE;
1202
goto end;
1203
}
1204
uint16_t port;
1205
errno = 0;
1206
tmpmax = strtoimax(address+1, &tmp, 10);
1207
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1208
or tmpmax != (uint16_t)tmpmax){
1209
fprintf(stderr, "Bad port number\n");
1210
exitcode = EXIT_FAILURE;
1211
goto end;
1212
}
1213
port = (uint16_t)tmpmax;
1214
*address = '\0';
1215
address = connect_to;
1216
/* Colon in address indicates IPv6 */
1217
int af;
1218
if(strchr(address, ':') != NULL){
1219
af = AF_INET6;
1220
} else {
1221
af = AF_INET;
1222
}
1223
ret = start_mandos_communication(address, port, if_index, af);
1224
if(ret < 0){
1225
exitcode = EXIT_FAILURE;
1226
} else {
1227
exitcode = EXIT_SUCCESS;
1228
}
1229
goto end;
1230
}
1231
1232
{
1233
AvahiServerConfig config;
1234
/* Do not publish any local Zeroconf records */
1235
avahi_server_config_init(&config);
1236
config.publish_hinfo = 0;
1237
config.publish_addresses = 0;
1238
config.publish_workstation = 0;
1239
config.publish_domain = 0;
1240
1241
/* Allocate a new server */
1242
mc.server = avahi_server_new(avahi_simple_poll_get
1243
(mc.simple_poll), &config, NULL,
1244
NULL, &error);
1245
1246
/* Free the Avahi configuration data */
1247
avahi_server_config_free(&config);
1248
}
1249
1250
/* Check if creating the Avahi server object succeeded */
1251
if(mc.server == NULL){
1252
fprintf(stderr, "Failed to create Avahi server: %s\n",
1253
avahi_strerror(error));
1254
exitcode = EXIT_FAILURE;
1255
goto end;
1256
}
1257
1258
/* Create the Avahi service browser */
1259
sb = avahi_s_service_browser_new(mc.server, if_index,
1260
AVAHI_PROTO_INET6, "_mandos._tcp",
1261
NULL, 0, browse_callback, NULL);
1262
if(sb == NULL){
1263
fprintf(stderr, "Failed to create service browser: %s\n",
1264
avahi_strerror(avahi_server_errno(mc.server)));
1265
exitcode = EXIT_FAILURE;
1266
goto end;
1267
}
1268
1269
/* Run the main loop */
1270
1271
if(debug){
1272
fprintf(stderr, "Starting Avahi loop search\n");
1273
}
1274
1275
avahi_simple_poll_loop(mc.simple_poll);
1276
935
exit(EXIT_FAILURE);
936
}
937
938
if(connect_to != NULL){
939
/* Connect directly, do not use Zeroconf */
940
/* (Mainly meant for debugging) */
941
char *address = strrchr(connect_to, ':');
942
if(address == NULL){
943
fprintf(stderr, "No colon in address\n");
944
exitcode = EXIT_FAILURE;
945
goto end;
946
}
947
errno = 0;
948
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
949
if(errno){
950
perror("Bad port number");
951
exitcode = EXIT_FAILURE;
952
goto end;
953
}
954
*address = '\0';
955
address = connect_to;
956
ret = start_mandos_communication(address, port, if_index, &mc);
957
if(ret < 0){
958
exitcode = EXIT_FAILURE;
959
} else {
960
exitcode = EXIT_SUCCESS;
961
}
962
goto end;
963
}
964
965
if (not debug){
966
avahi_set_log_function(empty_log);
967
}
968
969
/* Initialize the pseudo-RNG for Avahi */
970
srand((unsigned int) time(NULL));
971
972
/* Allocate main Avahi loop object */
973
mc.simple_poll = avahi_simple_poll_new();
974
if (mc.simple_poll == NULL) {
975
fprintf(stderr, "Avahi: Failed to create simple poll"
976
" object.\n");
977
exitcode = EXIT_FAILURE;
978
goto end;
979
}
980
981
{
982
AvahiServerConfig config;
983
/* Do not publish any local Zeroconf records */
984
avahi_server_config_init(&config);
985
config.publish_hinfo = 0;
986
config.publish_addresses = 0;
987
config.publish_workstation = 0;
988
config.publish_domain = 0;
989
990
/* Allocate a new server */
991
mc.server = avahi_server_new(avahi_simple_poll_get
992
(mc.simple_poll), &config, NULL,
993
NULL, &error);
994
995
/* Free the Avahi configuration data */
996
avahi_server_config_free(&config);
997
}
998
999
/* Check if creating the Avahi server object succeeded */
1000
if (mc.server == NULL) {
1001
fprintf(stderr, "Failed to create Avahi server: %s\n",
1002
avahi_strerror(error));
1003
exitcode = EXIT_FAILURE;
1004
goto end;
1005
}
1006
1007
/* Create the Avahi service browser */
1008
sb = avahi_s_service_browser_new(mc.server, if_index,
1009
AVAHI_PROTO_INET6,
1010
"_mandos._tcp", NULL, 0,
1011
browse_callback, &mc);
1012
if (sb == NULL) {
1013
fprintf(stderr, "Failed to create service browser: %s\n",
1014
avahi_strerror(avahi_server_errno(mc.server)));
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1017
}
1018
1019
/* Run the main loop */
1020
1021
if (debug){
1022
fprintf(stderr, "Starting Avahi loop search\n");
1023
}
1024
1025
avahi_simple_poll_loop(mc.simple_poll);
1026
1277
1027
end:
1278
1279
if(debug){
1280
fprintf(stderr, "%s exiting\n", argv[0]);
1281
}
1282
1283
/* Cleanup things */
1284
if(sb != NULL)
1285
avahi_s_service_browser_free(sb);
1286
1287
if(mc.server != NULL)
1288
avahi_server_free(mc.server);
1289
1290
if(mc.simple_poll != NULL)
1291
avahi_simple_poll_free(mc.simple_poll);
1292
1293
if(gnutls_initialized){
1294
gnutls_certificate_free_credentials(mc.cred);
1295
gnutls_global_deinit();
1296
gnutls_dh_params_deinit(mc.dh_params);
1297
}
1298
1299
if(gpgme_initialized){
1300
gpgme_release(mc.ctx);
1301
}
1302
1303
/* Removes the temp directory used by GPGME */
1304
if(tempdir_created){
1305
DIR *d;
1306
struct dirent *direntry;
1307
d = opendir(tempdir);
1308
if(d == NULL){
1309
if(errno != ENOENT){
1310
perror("opendir");
1311
}
1312
} else {
1313
while(true){
1314
direntry = readdir(d);
1315
if(direntry == NULL){
1316
break;
1317
}
1318
/* Skip "." and ".." */
1319
if(direntry->d_name[0] == '.'
1320
and (direntry->d_name[1] == '\0'
1321
or (direntry->d_name[1] == '.'
1322
and direntry->d_name[2] == '\0'))){
1323
continue;
1324
}
1325
char *fullname = NULL;
1326
ret = asprintf(&fullname, "%s/%s", tempdir,
1327
direntry->d_name);
1328
if(ret < 0){
1329
perror("asprintf");
1330
continue;
1331
}
1332
ret = remove(fullname);
1333
if(ret == -1){
1334
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1335
strerror(errno));
1336
}
1337
free(fullname);
1338
}
1339
closedir(d);
1340
}
1341
ret = rmdir(tempdir);
1342
if(ret == -1 and errno != ENOENT){
1343
perror("rmdir");
1344
}
1345
}
1346
1347
return exitcode;
1028
1029
if (debug){
1030
fprintf(stderr, "%s exiting\n", argv[0]);
1031
}
1032
1033
/* Cleanup things */
1034
if (sb != NULL)
1035
avahi_s_service_browser_free(sb);
1036
1037
if (mc.server != NULL)
1038
avahi_server_free(mc.server);
1039
1040
if (mc.simple_poll != NULL)
1041
avahi_simple_poll_free(mc.simple_poll);
1042
free(pubkeyfilename);
1043
free(seckeyfilename);
1044
1045
if (gnutls_initalized){
1046
gnutls_certificate_free_credentials(mc.cred);
1047
gnutls_global_deinit ();
1048
}
1049
1050
return exitcode;
1348
1051
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0