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- Committer: Teddy Hogeborn
- Date: 2009-05-24 23:36:15 UTC
- Revision ID: teddy@fukt.bsnet.se-20090524233615-ux63hgxddxl3c7l4
* debian/mandos-client.postinst (configure): Don't look for user and
group with the old name
if upgrading from a new
enough version.
group with the old name
if upgrading from a new
enough version.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
ferror() */
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
44
#include <stdint.h> /* uint16_t, uint32_t */
40
45
#include <stddef.h> /* NULL, size_t, ssize_t */
41
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
47
srand(), strtof() */
48
#include <stdbool.h> /* bool, false, true */
44
49
#include <string.h> /* memset(), strcmp(), strlen(),
45
strerror(), memcpy(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
47
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
53
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
52
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
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() */
55
64
#include <assert.h> /* assert() */
56
65
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
66
#include <time.h> /* nanosleep(), time() */
58
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
68
SIOCSIFFLAGS, if_indextoname(),
60
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
61
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
74
getuid(), getgid(), setuid(),
63
75
setgid() */
64
#include <netinet/in.h>
65
76
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
77
#include <iso646.h> /* not, or, and */
67
78
#include <argp.h> /* struct argp_option, error_t, struct
68
79
argp_state, struct argp,
69
80
argp_parse(), ARGP_KEY_ARG,
70
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
85
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
71
89
72
90
/* Avahi */
73
91
/* All Avahi types, constants and functions
81
99
#include <avahi-common/error.h>
82
100
83
101
/* GnuTLS */
84
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
102
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
103
functions:
85
104
gnutls_*
86
105
init_gnutls_session(),
87
106
GNUTLS_* */
88
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
89
109
GNUTLS_OPENPGP_FMT_BASE64 */
90
110
91
111
/* GPGME */
92
#include <gpgme.h> /* All GPGME types, constants and functions
112
#include <gpgme.h> /* All GPGME types, constants and
113
functions:
93
114
gpgme_*
94
115
GPGME_PROTOCOL_OpenPGP,
95
116
GPG_ERR_NO_* */
96
117
97
118
#define BUFFER_SIZE 256
98
119
120
#define PATHDIR "/conf/conf.d/mandos"
121
#define SECKEY "seckey.txt"
122
#define PUBKEY "pubkey.txt"
123
99
124
bool debug = false;
100
static const char *keydir = "/conf/conf.d/mandos";
101
125
static const char mandos_protocol_version[] = "1";
102
const char *argp_program_version = "password-request 1.0";
126
const char *argp_program_version = "mandos-client " VERSION;
103
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
104
128
105
129
/* Used for passing in values through the Avahi callback functions */
110
134
unsigned int dh_bits;
111
135
gnutls_dh_params_t dh_params;
112
136
const char *priority;
137
gpgme_ctx_t ctx;
113
138
} mandos_context;
114
139
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
115
145
/*
116
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
117
* "buffer_capacity" is how much is currently allocated,
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
118
148
* "buffer_length" is how much is already used.
119
149
*/
120
size_t adjustbuffer(char **buffer, size_t buffer_length,
150
size_t incbuffer(char **buffer, size_t buffer_length,
121
151
size_t buffer_capacity){
122
if (buffer_length + BUFFER_SIZE > buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
123
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
124
if (buffer == NULL){
154
if(buffer == NULL){
125
155
return 0;
126
156
}
127
157
buffer_capacity += BUFFER_SIZE;
130
160
}
131
161
132
162
/*
133
* Decrypt OpenPGP data using keyrings in HOMEDIR.
134
* Returns -1 on error
163
* Initialize GPGME.
135
164
*/
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;
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
142
168
gpgme_error_t rc;
143
ssize_t ret;
144
size_t plaintext_capacity = 0;
145
ssize_t plaintext_length = 0;
146
169
gpgme_engine_info_t engine_info;
147
170
148
if (debug){
149
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
171
172
/*
173
* Helper function to insert pub and seckey to the engine keyring.
174
*/
175
bool import_key(const char *filename){
176
int fd;
177
gpgme_data_t pgp_data;
178
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
if(fd == -1){
181
perror("open");
182
return false;
183
}
184
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
189
return false;
190
}
191
192
rc = gpgme_op_import(mc.ctx, pgp_data);
193
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
196
return false;
197
}
198
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
200
if(ret == -1){
201
perror("close");
202
}
203
gpgme_data_release(pgp_data);
204
return true;
205
}
206
207
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
150
209
}
151
210
152
211
/* Init GPGME */
153
212
gpgme_check_version(NULL);
154
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
155
if (rc != GPG_ERR_NO_ERROR){
214
if(rc != GPG_ERR_NO_ERROR){
156
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
157
216
gpgme_strsource(rc), gpgme_strerror(rc));
158
return -1;
217
return false;
159
218
}
160
219
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){
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){
164
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
165
224
gpgme_strsource(rc), gpgme_strerror(rc));
166
return -1;
225
return false;
167
226
}
168
227
while(engine_info != NULL){
169
228
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
170
229
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
171
engine_info->file_name, homedir);
230
engine_info->file_name, tempdir);
172
231
break;
173
232
}
174
233
engine_info = engine_info->next;
175
234
}
176
235
if(engine_info == NULL){
177
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
178
return -1;
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
237
return false;
238
}
239
240
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
242
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
245
return false;
246
}
247
248
if(not import_key(pubkey) or not import_key(seckey)){
249
return false;
250
}
251
252
return true;
253
}
254
255
/*
256
* Decrypt OpenPGP data.
257
* Returns -1 on error
258
*/
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
size_t crypto_size,
261
char **plaintext){
262
gpgme_data_t dh_crypto, dh_plain;
263
gpgme_error_t rc;
264
ssize_t ret;
265
size_t plaintext_capacity = 0;
266
ssize_t plaintext_length = 0;
267
268
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
179
270
}
180
271
181
272
/* Create new GPGME data buffer from memory cryptotext */
182
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
183
274
0);
184
if (rc != GPG_ERR_NO_ERROR){
275
if(rc != GPG_ERR_NO_ERROR){
185
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
186
277
gpgme_strsource(rc), gpgme_strerror(rc));
187
278
return -1;
189
280
190
281
/* Create new empty GPGME data buffer for the plaintext */
191
282
rc = gpgme_data_new(&dh_plain);
192
if (rc != GPG_ERR_NO_ERROR){
283
if(rc != GPG_ERR_NO_ERROR){
193
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
194
285
gpgme_strsource(rc), gpgme_strerror(rc));
195
286
gpgme_data_release(dh_crypto);
196
287
return -1;
197
288
}
198
289
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
208
290
/* Decrypt data from the cryptotext data buffer to the plaintext
209
291
data buffer */
210
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
211
if (rc != GPG_ERR_NO_ERROR){
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
212
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
213
295
gpgme_strsource(rc), gpgme_strerror(rc));
214
296
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;
312
if(recipient){
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
319
? "No" : "Yes");
320
recipient = recipient->next;
321
}
322
}
323
}
324
}
215
325
goto decrypt_end;
216
326
}
217
327
219
329
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
220
330
}
221
331
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){
238
while(recipient != NULL){
239
fprintf(stderr, "Public key algorithm: %s\n",
240
gpgme_pubkey_algo_name(recipient->pubkey_algo));
241
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
242
fprintf(stderr, "Secret key available: %s\n",
243
recipient->status == GPG_ERR_NO_SECKEY
244
? "No" : "Yes");
245
recipient = recipient->next;
246
}
247
}
248
}
249
}
250
251
332
/* Seek back to the beginning of the GPGME plaintext data buffer */
252
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
253
perror("pgpme_data_seek");
333
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
334
perror("gpgme_data_seek");
254
335
plaintext_length = -1;
255
336
goto decrypt_end;
256
337
}
257
338
258
339
*plaintext = NULL;
259
340
while(true){
260
plaintext_capacity = adjustbuffer(plaintext,
341
plaintext_capacity = incbuffer(plaintext,
261
342
(size_t)plaintext_length,
262
343
plaintext_capacity);
263
if (plaintext_capacity == 0){
264
perror("adjustbuffer");
344
if(plaintext_capacity == 0){
345
perror("incbuffer");
265
346
plaintext_length = -1;
266
347
goto decrypt_end;
267
348
}
269
350
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
270
351
BUFFER_SIZE);
271
352
/* Print the data, if any */
272
if (ret == 0){
353
if(ret == 0){
273
354
/* EOF */
274
355
break;
275
356
}
280
361
}
281
362
plaintext_length += ret;
282
363
}
283
364
284
365
if(debug){
285
366
fprintf(stderr, "Decrypted password is: ");
286
367
for(ssize_t i = 0; i < plaintext_length; i++){
299
380
return plaintext_length;
300
381
}
301
382
302
static const char * safer_gnutls_strerror (int value) {
303
const char *ret = gnutls_strerror (value);
304
if (ret == NULL)
383
static const char * safer_gnutls_strerror(int value){
384
const char *ret = gnutls_strerror(value); /* Spurious warning from
385
-Wunreachable-code */
386
if(ret == NULL)
305
387
ret = "(unknown)";
306
388
return ret;
307
389
}
312
394
fprintf(stderr, "GnuTLS: %s", string);
313
395
}
314
396
315
static int init_gnutls_global(mandos_context *mc,
316
const char *pubkeyfile,
317
const char *seckeyfile){
397
static int init_gnutls_global(const char *pubkeyfilename,
398
const char *seckeyfilename){
318
399
int ret;
319
400
320
401
if(debug){
322
403
}
323
404
324
405
ret = gnutls_global_init();
325
if (ret != GNUTLS_E_SUCCESS) {
326
fprintf (stderr, "GnuTLS global_init: %s\n",
327
safer_gnutls_strerror(ret));
406
if(ret != GNUTLS_E_SUCCESS){
407
fprintf(stderr, "GnuTLS global_init: %s\n",
408
safer_gnutls_strerror(ret));
328
409
return -1;
329
410
}
330
411
331
if (debug){
412
if(debug){
332
413
/* "Use a log level over 10 to enable all debugging options."
333
414
* - GnuTLS manual
334
415
*/
337
418
}
338
419
339
420
/* OpenPGP credentials */
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 ();
421
gnutls_certificate_allocate_credentials(&mc.cred);
422
if(ret != GNUTLS_E_SUCCESS){
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
427
safer_gnutls_strerror(ret));
428
gnutls_global_deinit();
345
429
return -1;
346
430
}
347
431
348
432
if(debug){
349
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
350
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
351
seckeyfile);
433
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
434
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
435
seckeyfilename);
352
436
}
353
437
354
438
ret = gnutls_certificate_set_openpgp_key_file
355
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
356
if (ret != GNUTLS_E_SUCCESS) {
439
(mc.cred, pubkeyfilename, seckeyfilename,
440
GNUTLS_OPENPGP_FMT_BASE64);
441
if(ret != GNUTLS_E_SUCCESS){
357
442
fprintf(stderr,
358
443
"Error[%d] while reading the OpenPGP key pair ('%s',"
359
" '%s')\n", ret, pubkeyfile, seckeyfile);
360
fprintf(stdout, "The GnuTLS error is: %s\n",
444
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
445
fprintf(stderr, "The GnuTLS error is: %s\n",
361
446
safer_gnutls_strerror(ret));
362
447
goto globalfail;
363
448
}
364
449
365
450
/* GnuTLS server initialization */
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
451
ret = gnutls_dh_params_init(&mc.dh_params);
452
if(ret != GNUTLS_E_SUCCESS){
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
454
" %s\n", safer_gnutls_strerror(ret));
455
goto globalfail;
456
}
457
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
458
if(ret != GNUTLS_E_SUCCESS){
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
460
safer_gnutls_strerror(ret));
461
goto globalfail;
462
}
463
464
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
465
381
466
return 0;
382
467
383
468
globalfail:
384
385
gnutls_certificate_free_credentials(mc->cred);
469
470
gnutls_certificate_free_credentials(mc.cred);
386
471
gnutls_global_deinit();
472
gnutls_dh_params_deinit(mc.dh_params);
387
473
return -1;
388
389
474
}
390
475
391
static int init_gnutls_session(mandos_context *mc,
392
gnutls_session_t *session){
476
static int init_gnutls_session(gnutls_session_t *session){
393
477
int ret;
394
478
/* GnuTLS session creation */
395
479
ret = gnutls_init(session, GNUTLS_SERVER);
396
if (ret != GNUTLS_E_SUCCESS){
480
if(ret != GNUTLS_E_SUCCESS){
397
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
398
482
safer_gnutls_strerror(ret));
399
483
}
400
484
401
485
{
402
486
const char *err;
403
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
404
if (ret != GNUTLS_E_SUCCESS) {
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
488
if(ret != GNUTLS_E_SUCCESS){
405
489
fprintf(stderr, "Syntax error at: %s\n", err);
406
490
fprintf(stderr, "GnuTLS error: %s\n",
407
491
safer_gnutls_strerror(ret));
408
gnutls_deinit (*session);
492
gnutls_deinit(*session);
409
493
return -1;
410
494
}
411
495
}
412
496
413
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
414
mc->cred);
415
if (ret != GNUTLS_E_SUCCESS) {
498
mc.cred);
499
if(ret != GNUTLS_E_SUCCESS){
416
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
417
501
safer_gnutls_strerror(ret));
418
gnutls_deinit (*session);
502
gnutls_deinit(*session);
419
503
return -1;
420
504
}
421
505
422
506
/* ignore client certificate if any. */
423
gnutls_certificate_server_set_request (*session,
424
GNUTLS_CERT_IGNORE);
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
425
509
426
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
427
511
428
512
return 0;
429
513
}
435
519
/* Called when a Mandos server is found */
436
520
static int start_mandos_communication(const char *ip, uint16_t port,
437
521
AvahiIfIndex if_index,
438
mandos_context *mc){
522
int af){
439
523
int ret, tcp_sd;
440
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
524
ssize_t sret;
525
union {
526
struct sockaddr_in in;
527
struct sockaddr_in6 in6;
528
} to;
441
529
char *buffer = NULL;
442
530
char *decrypted_buffer;
443
531
size_t buffer_length = 0;
445
533
ssize_t decrypted_buffer_size;
446
534
size_t written;
447
535
int retval = 0;
448
char interface[IF_NAMESIZE];
449
536
gnutls_session_t session;
450
451
ret = init_gnutls_session (mc, &session);
452
if (ret != 0){
537
int pf; /* Protocol family */
538
539
switch(af){
540
case AF_INET6:
541
pf = PF_INET6;
542
break;
543
case AF_INET:
544
pf = PF_INET;
545
break;
546
default:
547
fprintf(stderr, "Bad address family: %d\n", af);
548
return -1;
549
}
550
551
ret = init_gnutls_session(&session);
552
if(ret != 0){
453
553
return -1;
454
554
}
455
555
456
556
if(debug){
457
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
458
558
"\n", ip, port);
459
559
}
460
560
461
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
462
if(tcp_sd < 0) {
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
562
if(tcp_sd < 0){
463
563
perror("socket");
464
564
return -1;
465
565
}
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
566
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 ){
567
memset(&to, 0, sizeof(to));
568
if(af == AF_INET6){
569
to.in6.sin6_family = (sa_family_t)af;
570
ret = inet_pton(af, ip, &to.in6.sin6_addr);
571
} else { /* IPv4 */
572
to.in.sin_family = (sa_family_t)af;
573
ret = inet_pton(af, ip, &to.in.sin_addr);
574
}
575
if(ret < 0 ){
481
576
perror("inet_pton");
482
577
return -1;
483
578
}
485
580
fprintf(stderr, "Bad address: %s\n", ip);
486
581
return -1;
487
582
}
488
to.in6.sin6_port = htons(port); /* Spurious warning */
489
490
to.in6.sin6_scope_id = (uint32_t)if_index;
583
if(af == AF_INET6){
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
585
-Wconversion and
586
-Wunreachable-code */
587
588
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
589
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
590
-Wunreachable-code*/
591
if(if_index == AVAHI_IF_UNSPEC){
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
593
" without a network interface\n");
594
return -1;
595
}
596
/* Set the network interface number as scope */
597
to.in6.sin6_scope_id = (uint32_t)if_index;
598
}
599
} else {
600
to.in.sin_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
603
}
491
604
492
605
if(debug){
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){
606
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
607
char interface[IF_NAMESIZE];
608
if(if_indextoname((unsigned int)if_index, interface) == NULL){
609
perror("if_indextoname");
610
} else {
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
612
ip, interface, port);
613
}
614
} else {
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
616
port);
617
}
618
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
619
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
620
const char *pcret;
621
if(af == AF_INET6){
622
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
623
sizeof(addrstr));
624
} else {
625
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
626
sizeof(addrstr));
627
}
628
if(pcret == NULL){
498
629
perror("inet_ntop");
499
630
} else {
500
631
if(strcmp(addrstr, ip) != 0){
503
634
}
504
635
}
505
636
506
ret = connect(tcp_sd, &to.in, sizeof(to));
507
if (ret < 0){
637
if(af == AF_INET6){
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
639
} else {
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
641
}
642
if(ret < 0){
508
643
perror("connect");
509
644
return -1;
510
645
}
511
646
512
647
const char *out = mandos_protocol_version;
513
648
written = 0;
514
while (true){
649
while(true){
515
650
size_t out_size = strlen(out);
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
651
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
517
652
out_size - written));
518
if (ret == -1){
653
if(ret == -1){
519
654
perror("write");
520
655
retval = -1;
521
656
goto mandos_end;
524
659
if(written < out_size){
525
660
continue;
526
661
} else {
527
if (out == mandos_protocol_version){
662
if(out == mandos_protocol_version){
528
663
written = 0;
529
664
out = "\r\n";
530
665
} else {
532
667
}
533
668
}
534
669
}
535
670
536
671
if(debug){
537
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
538
673
}
539
674
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
676
542
677
do{
543
ret = gnutls_handshake (session);
678
ret = gnutls_handshake(session);
544
679
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
545
680
546
if (ret != GNUTLS_E_SUCCESS){
681
if(ret != GNUTLS_E_SUCCESS){
547
682
if(debug){
548
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
549
gnutls_perror (ret);
684
gnutls_perror(ret);
550
685
}
551
686
retval = -1;
552
687
goto mandos_end;
555
690
/* Read OpenPGP packet that contains the wanted password */
556
691
557
692
if(debug){
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
693
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
559
694
ip);
560
695
}
561
696
562
697
while(true){
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
698
buffer_capacity = incbuffer(&buffer, buffer_length,
564
699
buffer_capacity);
565
if (buffer_capacity == 0){
566
perror("adjustbuffer");
700
if(buffer_capacity == 0){
701
perror("incbuffer");
567
702
retval = -1;
568
703
goto mandos_end;
569
704
}
570
705
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
573
if (ret == 0){
706
sret = gnutls_record_recv(session, buffer+buffer_length,
707
BUFFER_SIZE);
708
if(sret == 0){
574
709
break;
575
710
}
576
if (ret < 0){
577
switch(ret){
711
if(sret < 0){
712
switch(sret){
578
713
case GNUTLS_E_INTERRUPTED:
579
714
case GNUTLS_E_AGAIN:
580
715
break;
581
716
case GNUTLS_E_REHANDSHAKE:
582
717
do{
583
ret = gnutls_handshake (session);
718
ret = gnutls_handshake(session);
584
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
585
if (ret < 0){
720
if(ret < 0){
586
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
587
gnutls_perror (ret);
722
gnutls_perror(ret);
588
723
retval = -1;
589
724
goto mandos_end;
590
725
}
593
728
fprintf(stderr, "Unknown error while reading data from"
594
729
" encrypted session with Mandos server\n");
595
730
retval = -1;
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
731
gnutls_bye(session, GNUTLS_SHUT_RDWR);
597
732
goto mandos_end;
598
733
}
599
734
} else {
600
buffer_length += (size_t) ret;
735
buffer_length += (size_t) sret;
601
736
}
602
737
}
603
738
605
740
fprintf(stderr, "Closing TLS session\n");
606
741
}
607
742
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
609
744
610
if (buffer_length > 0){
745
if(buffer_length > 0){
611
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
612
747
buffer_length,
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
748
&decrypted_buffer);
749
if(decrypted_buffer_size >= 0){
616
750
written = 0;
617
751
while(written < (size_t) decrypted_buffer_size){
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
stdout);
752
ret = (int)fwrite(decrypted_buffer + written, 1,
753
(size_t)decrypted_buffer_size - written,
754
stdout);
621
755
if(ret == 0 and ferror(stdout)){
622
756
if(debug){
623
757
fprintf(stderr, "Error writing encrypted data: %s\n",
632
766
} else {
633
767
retval = -1;
634
768
}
769
} else {
770
retval = -1;
635
771
}
636
772
637
773
/* Shutdown procedure */
638
774
639
775
mandos_end:
640
776
free(buffer);
641
close(tcp_sd);
642
gnutls_deinit (session);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
780
}
781
gnutls_deinit(session);
643
782
return retval;
644
783
}
645
784
646
785
static void resolve_callback(AvahiSServiceResolver *r,
647
786
AvahiIfIndex interface,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
787
AvahiProtocol proto,
649
788
AvahiResolverEvent event,
650
789
const char *name,
651
790
const char *type,
656
795
AVAHI_GCC_UNUSED AvahiStringList *txt,
657
796
AVAHI_GCC_UNUSED AvahiLookupResultFlags
658
797
flags,
659
void* userdata) {
660
mandos_context *mc = userdata;
661
assert(r); /* Spurious warning */
798
AVAHI_GCC_UNUSED void* userdata){
799
assert(r);
662
800
663
801
/* Called whenever a service has been resolved successfully or
664
802
timed out */
665
803
666
switch (event) {
804
switch(event){
667
805
default:
668
806
case AVAHI_RESOLVER_FAILURE:
669
807
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
670
808
" of type '%s' in domain '%s': %s\n", name, type, domain,
671
avahi_strerror(avahi_server_errno(mc->server)));
809
avahi_strerror(avahi_server_errno(mc.server)));
672
810
break;
673
811
674
812
case AVAHI_RESOLVER_FOUND:
677
815
avahi_address_snprint(ip, sizeof(ip), address);
678
816
if(debug){
679
817
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
680
PRIu16 ") on port %d\n", name, host_name, ip,
681
interface, port);
818
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
819
ip, (intmax_t)interface, port);
682
820
}
683
int ret = start_mandos_communication(ip, port, interface, mc);
684
if (ret == 0){
685
exit(EXIT_SUCCESS);
821
int ret = start_mandos_communication(ip, port, interface,
822
avahi_proto_to_af(proto));
823
if(ret == 0){
824
avahi_simple_poll_quit(mc.simple_poll);
686
825
}
687
826
}
688
827
}
689
828
avahi_s_service_resolver_free(r);
690
829
}
691
830
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 */
831
static void browse_callback(AvahiSServiceBrowser *b,
832
AvahiIfIndex interface,
833
AvahiProtocol protocol,
834
AvahiBrowserEvent event,
835
const char *name,
836
const char *type,
837
const char *domain,
838
AVAHI_GCC_UNUSED AvahiLookupResultFlags
839
flags,
840
AVAHI_GCC_UNUSED void* userdata){
841
assert(b);
704
842
705
843
/* Called whenever a new services becomes available on the LAN or
706
844
is removed from the LAN */
707
845
708
switch (event) {
846
switch(event){
709
847
default:
710
848
case AVAHI_BROWSER_FAILURE:
711
849
712
850
fprintf(stderr, "(Avahi browser) %s\n",
713
avahi_strerror(avahi_server_errno(mc->server)));
714
avahi_simple_poll_quit(mc->simple_poll);
851
avahi_strerror(avahi_server_errno(mc.server)));
852
avahi_simple_poll_quit(mc.simple_poll);
715
853
return;
716
854
717
855
case AVAHI_BROWSER_NEW:
720
858
the callback function is called the Avahi server will free the
721
859
resolver for us. */
722
860
723
if (!(avahi_s_service_resolver_new(mc->server, interface,
724
protocol, name, type, domain,
725
AVAHI_PROTO_INET6, 0,
726
resolve_callback, mc)))
861
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
862
name, type, domain, protocol, 0,
863
resolve_callback, NULL) == NULL)
727
864
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
728
name, avahi_strerror(avahi_server_errno(mc->server)));
865
name, avahi_strerror(avahi_server_errno(mc.server)));
729
866
break;
730
867
731
868
case AVAHI_BROWSER_REMOVE:
740
877
}
741
878
}
742
879
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;
880
sig_atomic_t quit_now = 0;
881
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
884
if(quit_now){
885
return;
886
}
887
quit_now = 1;
888
int old_errno = errno;
889
if(mc.simple_poll != NULL){
890
avahi_simple_poll_quit(mc.simple_poll);
891
}
892
errno = old_errno;
761
893
}
762
894
763
764
895
int main(int argc, char *argv[]){
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);
896
AvahiSServiceBrowser *sb = NULL;
897
int error;
898
int ret;
899
intmax_t tmpmax;
900
char *tmp;
901
int exitcode = EXIT_SUCCESS;
902
const char *interface = "eth0";
903
struct ifreq network;
904
int sd;
905
uid_t uid;
906
gid_t gid;
907
char *connect_to = NULL;
908
char tempdir[] = "/tmp/mandosXXXXXX";
909
bool tempdir_created = false;
910
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
911
const char *seckey = PATHDIR "/" SECKEY;
912
const char *pubkey = PATHDIR "/" PUBKEY;
913
914
bool gnutls_initialized = false;
915
bool gpgme_initialized = false;
916
float delay = 2.5f;
917
918
struct sigaction old_sigterm_action;
919
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
920
921
{
922
struct argp_option options[] = {
923
{ .name = "debug", .key = 128,
924
.doc = "Debug mode", .group = 3 },
925
{ .name = "connect", .key = 'c',
926
.arg = "ADDRESS:PORT",
927
.doc = "Connect directly to a specific Mandos server",
928
.group = 1 },
929
{ .name = "interface", .key = 'i',
930
.arg = "NAME",
931
.doc = "Network interface that will be used to search for"
932
" Mandos servers",
933
.group = 1 },
934
{ .name = "seckey", .key = 's',
935
.arg = "FILE",
936
.doc = "OpenPGP secret key file base name",
937
.group = 1 },
938
{ .name = "pubkey", .key = 'p',
939
.arg = "FILE",
940
.doc = "OpenPGP public key file base name",
941
.group = 2 },
942
{ .name = "dh-bits", .key = 129,
943
.arg = "BITS",
944
.doc = "Bit length of the prime number used in the"
945
" Diffie-Hellman key exchange",
946
.group = 2 },
947
{ .name = "priority", .key = 130,
948
.arg = "STRING",
949
.doc = "GnuTLS priority string for the TLS handshake",
950
.group = 1 },
951
{ .name = "delay", .key = 131,
952
.arg = "SECONDS",
953
.doc = "Maximum delay to wait for interface startup",
954
.group = 2 },
955
{ .name = NULL }
956
};
957
958
error_t parse_opt(int key, char *arg,
959
struct argp_state *state){
960
switch(key){
961
case 128: /* --debug */
962
debug = true;
963
break;
964
case 'c': /* --connect */
965
connect_to = arg;
966
break;
967
case 'i': /* --interface */
968
interface = arg;
969
break;
970
case 's': /* --seckey */
971
seckey = arg;
972
break;
973
case 'p': /* --pubkey */
974
pubkey = arg;
975
break;
976
case 129: /* --dh-bits */
977
errno = 0;
978
tmpmax = strtoimax(arg, &tmp, 10);
979
if(errno != 0 or tmp == arg or *tmp != '\0'
980
or tmpmax != (typeof(mc.dh_bits))tmpmax){
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
983
}
984
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
985
break;
986
case 130: /* --priority */
987
mc.priority = arg;
988
break;
989
case 131: /* --delay */
990
errno = 0;
991
delay = strtof(arg, &tmp);
992
if(errno != 0 or tmp == arg or *tmp != '\0'){
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
995
}
996
break;
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
1000
break;
1001
default:
1002
return ARGP_ERR_UNKNOWN;
1003
}
1004
return 0;
1005
}
1006
1007
struct argp argp = { .options = options, .parser = parse_opt,
1008
.args_doc = "",
1009
.doc = "Mandos client -- Get and decrypt"
1010
" passwords from a Mandos server" };
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1015
goto end;
1016
}
1017
}
1018
1019
if(not debug){
1020
avahi_set_log_function(empty_log);
1021
}
1022
1023
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1024
from the signal handler */
1025
/* Initialize the pseudo-RNG for Avahi */
1026
srand((unsigned int) time(NULL));
1027
mc.simple_poll = avahi_simple_poll_new();
1028
if(mc.simple_poll == NULL){
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
1031
goto end;
1032
}
1033
1034
sigemptyset(&sigterm_action.sa_mask);
1035
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1036
if(ret == -1){
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
1039
goto end;
1040
}
1041
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1042
if(ret == -1){
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
1045
goto end;
1046
}
1047
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1048
if(ret == -1){
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1051
goto end;
1052
}
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
if(ret == -1){
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1059
1060
/* If the interface is down, bring it up */
1061
if(interface[0] != '\0'){
1062
#ifdef __linux__
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1064
messages to mess up the prompt */
1065
ret = klogctl(8, NULL, 5);
1066
bool restore_loglevel = true;
1067
if(ret == -1){
1068
restore_loglevel = false;
1069
perror("klogctl");
1070
}
1071
#endif /* __linux__ */
1072
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1074
if(sd < 0){
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1077
#ifdef __linux__
1078
if(restore_loglevel){
1079
ret = klogctl(7, NULL, 0);
1080
if(ret == -1){
1081
perror("klogctl");
1082
}
1083
}
1084
#endif /* __linux__ */
1085
goto end;
1086
}
1087
strcpy(network.ifr_name, interface);
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1089
if(ret == -1){
1090
perror("ioctl SIOCGIFFLAGS");
1091
#ifdef __linux__
1092
if(restore_loglevel){
1093
ret = klogctl(7, NULL, 0);
1094
if(ret == -1){
1095
perror("klogctl");
1096
}
1097
}
1098
#endif /* __linux__ */
1099
exitcode = EXIT_FAILURE;
1100
goto end;
1101
}
1102
if((network.ifr_flags & IFF_UP) == 0){
1103
network.ifr_flags |= IFF_UP;
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1105
if(ret == -1){
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1108
#ifdef __linux__
1109
if(restore_loglevel){
1110
ret = klogctl(7, NULL, 0);
1111
if(ret == -1){
1112
perror("klogctl");
846
1113
}
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
1114
}
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
goto end;
885
}
886
887
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
888
if (ret == -1){
889
fprintf(stderr, "init_gnutls_global\n");
890
goto end;
891
} else {
892
gnutls_initalized = true;
893
}
894
895
/* If the interface is down, bring it up */
896
{
897
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
898
if(sd < 0) {
899
perror("socket");
900
exitcode = EXIT_FAILURE;
901
goto end;
902
}
903
strcpy(network.ifr_name, interface); /* Spurious warning */
1115
#endif /* __linux__ */
1116
goto end;
1117
}
1118
}
1119
/* sleep checking until interface is running */
1120
for(int i=0; i < delay * 4; i++){
904
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
905
1122
if(ret == -1){
906
1123
perror("ioctl SIOCGIFFLAGS");
907
exitcode = EXIT_FAILURE;
908
goto end;
909
}
910
if((network.ifr_flags & IFF_UP) == 0){
911
network.ifr_flags |= IFF_UP;
912
ret = ioctl(sd, SIOCSIFFLAGS, &network);
913
if(ret == -1){
914
perror("ioctl SIOCSIFFLAGS");
915
exitcode = EXIT_FAILURE;
916
goto end;
917
}
918
}
919
close(sd);
920
}
921
922
uid = getuid();
923
gid = getgid();
924
925
ret = setuid(uid);
926
if (ret == -1){
927
perror("setuid");
928
}
929
930
setgid(gid);
931
if (ret == -1){
932
perror("setgid");
933
}
934
1124
} else if(network.ifr_flags & IFF_RUNNING){
1125
break;
1126
}
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1128
ret = nanosleep(&sleeptime, NULL);
1129
if(ret == -1 and errno != EINTR){
1130
perror("nanosleep");
1131
}
1132
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1136
}
1137
#ifdef __linux__
1138
if(restore_loglevel){
1139
/* Restores kernel loglevel to default */
1140
ret = klogctl(7, NULL, 0);
1141
if(ret == -1){
1142
perror("klogctl");
1143
}
1144
}
1145
#endif /* __linux__ */
1146
}
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
errno = 0;
1152
setgid(gid);
1153
if(ret == -1){
1154
perror("setgid");
1155
}
1156
1157
ret = setuid(uid);
1158
if(ret == -1){
1159
perror("setuid");
1160
}
1161
1162
ret = init_gnutls_global(pubkey, seckey);
1163
if(ret == -1){
1164
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
1166
goto end;
1167
} else {
1168
gnutls_initialized = true;
1169
}
1170
1171
if(mkdtemp(tempdir) == NULL){
1172
perror("mkdtemp");
1173
goto end;
1174
}
1175
tempdir_created = true;
1176
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
1178
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
1180
goto end;
1181
} else {
1182
gpgme_initialized = true;
1183
}
1184
1185
if(interface[0] != '\0'){
935
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
936
1187
if(if_index == 0){
937
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
938
exit(EXIT_FAILURE);
939
}
940
941
if(connect_to != NULL){
942
/* Connect directly, do not use Zeroconf */
943
/* (Mainly meant for debugging) */
944
char *address = strrchr(connect_to, ':');
945
if(address == NULL){
946
fprintf(stderr, "No colon in address\n");
947
exitcode = EXIT_FAILURE;
948
goto end;
949
}
950
errno = 0;
951
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
952
if(errno){
953
perror("Bad port number");
954
exitcode = EXIT_FAILURE;
955
goto end;
956
}
957
*address = '\0';
958
address = connect_to;
959
ret = start_mandos_communication(address, port, if_index, &mc);
960
if(ret < 0){
961
exitcode = EXIT_FAILURE;
962
} else {
963
exitcode = EXIT_SUCCESS;
964
}
965
goto end;
966
}
967
968
if (not debug){
969
avahi_set_log_function(empty_log);
970
}
971
972
/* Initialize the pseudo-RNG for Avahi */
973
srand((unsigned int) time(NULL));
974
975
/* Allocate main Avahi loop object */
976
mc.simple_poll = avahi_simple_poll_new();
977
if (mc.simple_poll == NULL) {
978
fprintf(stderr, "Avahi: Failed to create simple poll"
979
" object.\n");
980
exitcode = EXIT_FAILURE;
981
goto end;
982
}
983
984
{
985
AvahiServerConfig config;
986
/* Do not publish any local Zeroconf records */
987
avahi_server_config_init(&config);
988
config.publish_hinfo = 0;
989
config.publish_addresses = 0;
990
config.publish_workstation = 0;
991
config.publish_domain = 0;
992
993
/* Allocate a new server */
994
mc.server = avahi_server_new(avahi_simple_poll_get
995
(mc.simple_poll), &config, NULL,
996
NULL, &error);
997
998
/* Free the Avahi configuration data */
999
avahi_server_config_free(&config);
1000
}
1001
1002
/* Check if creating the Avahi server object succeeded */
1003
if (mc.server == NULL) {
1004
fprintf(stderr, "Failed to create Avahi server: %s\n",
1005
avahi_strerror(error));
1006
exitcode = EXIT_FAILURE;
1007
goto end;
1008
}
1009
1010
/* Create the Avahi service browser */
1011
sb = avahi_s_service_browser_new(mc.server, if_index,
1012
AVAHI_PROTO_INET6,
1013
"_mandos._tcp", NULL, 0,
1014
browse_callback, &mc);
1015
if (sb == NULL) {
1016
fprintf(stderr, "Failed to create service browser: %s\n",
1017
avahi_strerror(avahi_server_errno(mc.server)));
1018
exitcode = EXIT_FAILURE;
1019
goto end;
1020
}
1021
1022
/* Run the main loop */
1023
1024
if (debug){
1025
fprintf(stderr, "Starting Avahi loop search\n");
1026
}
1027
1028
avahi_simple_poll_loop(mc.simple_poll);
1029
1189
exitcode = EXIT_FAILURE;
1190
goto end;
1191
}
1192
}
1193
1194
if(connect_to != NULL){
1195
/* Connect directly, do not use Zeroconf */
1196
/* (Mainly meant for debugging) */
1197
char *address = strrchr(connect_to, ':');
1198
if(address == NULL){
1199
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
1203
uint16_t port;
1204
errno = 0;
1205
tmpmax = strtoimax(address+1, &tmp, 10);
1206
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1207
or tmpmax != (uint16_t)tmpmax){
1208
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
1212
port = (uint16_t)tmpmax;
1213
*address = '\0';
1214
address = connect_to;
1215
/* Colon in address indicates IPv6 */
1216
int af;
1217
if(strchr(address, ':') != NULL){
1218
af = AF_INET6;
1219
} else {
1220
af = AF_INET;
1221
}
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
1226
exitcode = EXIT_SUCCESS;
1227
}
1228
goto end;
1229
}
1230
1231
{
1232
AvahiServerConfig config;
1233
/* Do not publish any local Zeroconf records */
1234
avahi_server_config_init(&config);
1235
config.publish_hinfo = 0;
1236
config.publish_addresses = 0;
1237
config.publish_workstation = 0;
1238
config.publish_domain = 0;
1239
1240
/* Allocate a new server */
1241
mc.server = avahi_server_new(avahi_simple_poll_get
1242
(mc.simple_poll), &config, NULL,
1243
NULL, &error);
1244
1245
/* Free the Avahi configuration data */
1246
avahi_server_config_free(&config);
1247
}
1248
1249
/* Check if creating the Avahi server object succeeded */
1250
if(mc.server == NULL){
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
1252
avahi_strerror(error));
1253
exitcode = EXIT_FAILURE;
1254
goto end;
1255
}
1256
1257
/* Create the Avahi service browser */
1258
sb = avahi_s_service_browser_new(mc.server, if_index,
1259
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1260
NULL, 0, browse_callback, NULL);
1261
if(sb == NULL){
1262
fprintf(stderr, "Failed to create service browser: %s\n",
1263
avahi_strerror(avahi_server_errno(mc.server)));
1264
exitcode = EXIT_FAILURE;
1265
goto end;
1266
}
1267
1268
/* Run the main loop */
1269
1270
if(debug){
1271
fprintf(stderr, "Starting Avahi loop search\n");
1272
}
1273
1274
avahi_simple_poll_loop(mc.simple_poll);
1275
1030
1276
end:
1031
1032
if (debug){
1033
fprintf(stderr, "%s exiting\n", argv[0]);
1034
}
1035
1036
/* Cleanup things */
1037
if (sb != NULL)
1038
avahi_s_service_browser_free(sb);
1039
1040
if (mc.server != NULL)
1041
avahi_server_free(mc.server);
1042
1043
if (mc.simple_poll != NULL)
1044
avahi_simple_poll_free(mc.simple_poll);
1045
free(pubkeyfile);
1046
free(seckeyfile);
1047
1048
if (gnutls_initalized){
1049
gnutls_certificate_free_credentials(mc.cred);
1050
gnutls_global_deinit ();
1051
}
1052
1053
return exitcode;
1277
1278
if(debug){
1279
fprintf(stderr, "%s exiting\n", argv[0]);
1280
}
1281
1282
/* Cleanup things */
1283
if(sb != NULL)
1284
avahi_s_service_browser_free(sb);
1285
1286
if(mc.server != NULL)
1287
avahi_server_free(mc.server);
1288
1289
if(mc.simple_poll != NULL)
1290
avahi_simple_poll_free(mc.simple_poll);
1291
1292
if(gnutls_initialized){
1293
gnutls_certificate_free_credentials(mc.cred);
1294
gnutls_global_deinit();
1295
gnutls_dh_params_deinit(mc.dh_params);
1296
}
1297
1298
if(gpgme_initialized){
1299
gpgme_release(mc.ctx);
1300
}
1301
1302
/* Removes the temp directory used by GPGME */
1303
if(tempdir_created){
1304
DIR *d;
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1307
if(d == NULL){
1308
if(errno != ENOENT){
1309
perror("opendir");
1310
}
1311
} else {
1312
while(true){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1315
break;
1316
}
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1322
continue;
1323
}
1324
char *fullname = NULL;
1325
ret = asprintf(&fullname, "%s/%s", tempdir,
1326
direntry->d_name);
1327
if(ret < 0){
1328
perror("asprintf");
1329
continue;
1330
}
1331
ret = remove(fullname);
1332
if(ret == -1){
1333
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1334
strerror(errno));
1335
}
1336
free(fullname);
1337
}
1338
closedir(d);
1339
}
1340
ret = rmdir(tempdir);
1341
if(ret == -1 and errno != ENOENT){
1342
perror("rmdir");
1343
}
1344
}
1345
1346
return exitcode;
1054
1347
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0