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- Committer: Björn Påhlsson
- Date: 2009-02-09 18:15:18 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 309.
- Revision ID: belorn@braxen-20090209181518-powtql91qv3wu51d
Earlier signal handling
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- plugbasedclient.c => plugin-runner.c
- plugins.d/mandosclient.c => plugins.d/mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- 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
32
33
#define _LARGEFILE_SOURCE
33
34
#define _FILE_OFFSET_BITS 64
34
35
35
#include <stdio.h>
36
#include <assert.h>
37
#include <stdlib.h>
38
#include <time.h>
39
#include <net/if.h> /* if_nametoindex */
40
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
41
SIOCSIFFLAGS */
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
41
#include <stdint.h> /* uint16_t, uint32_t */
42
#include <stddef.h> /* NULL, size_t, ssize_t */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, false, true */
46
#include <string.h> /* memset(), strcmp(), strlen(),
47
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, uid_t, gid_t, open(),
52
opendir(), DIR */
53
#include <sys/stat.h> /* open() */
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
inet_pton(), connect() */
56
#include <fcntl.h> /* open() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
58
*/
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
60
#include <assert.h> /* assert() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
42
63
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
64
SIOCSIFFLAGS, if_indextoname(),
65
if_nametoindex(), IF_NAMESIZE */
66
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
*/
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, or, and */
74
#include <argp.h> /* struct argp_option, error_t, struct
75
argp_state, struct argp,
76
argp_parse(), ARGP_KEY_ARG,
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
#include <signal.h> /* sigemptyset(), sigaddset(), sigaction(), SIGTERM, sigaction */
79
#ifdef __linux__
80
#include <sys/klog.h> /* klogctl() */
81
#endif
44
82
83
/* Avahi */
84
/* All Avahi types, constants and functions
85
Avahi*, avahi_*,
86
AVAHI_* */
45
87
#include <avahi-core/core.h>
46
88
#include <avahi-core/lookup.h>
47
89
#include <avahi-core/log.h>
49
91
#include <avahi-common/malloc.h>
50
92
#include <avahi-common/error.h>
51
93
52
/* Mandos client part */
53
#include <sys/types.h> /* socket(), inet_pton() */
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
struct in6_addr, inet_pton() */
56
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
57
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
58
59
#include <unistd.h> /* close() */
60
#include <netinet/in.h>
61
#include <stdbool.h> /* true */
62
#include <string.h> /* memset */
63
#include <arpa/inet.h> /* inet_pton() */
64
#include <iso646.h> /* not */
65
#include <net/if.h> /* IF_NAMESIZE */
94
/* GnuTLS */
95
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
96
functions:
97
gnutls_*
98
init_gnutls_session(),
99
GNUTLS_* */
100
#include <gnutls/openpgp.h>
101
/* gnutls_certificate_set_openpgp_key_file(),
102
GNUTLS_OPENPGP_FMT_BASE64 */
66
103
67
104
/* GPGME */
68
#include <errno.h> /* perror() */
69
#include <gpgme.h>
70
71
/* getopt_long */
72
#include <getopt.h>
105
#include <gpgme.h> /* All GPGME types, constants and
106
functions:
107
gpgme_*
108
GPGME_PROTOCOL_OpenPGP,
109
GPG_ERR_NO_* */
73
110
74
111
#define BUFFER_SIZE 256
75
112
76
static const char *keydir = "/conf/conf.d/mandos";
77
static const char *pubkeyfile = "pubkey.txt";
78
static const char *seckeyfile = "seckey.txt";
113
#define PATHDIR "/conf/conf.d/mandos"
114
#define SECKEY "seckey.txt"
115
#define PUBKEY "pubkey.txt"
79
116
80
117
bool debug = false;
118
static const char mandos_protocol_version[] = "1";
119
const char *argp_program_version = "mandos-client " VERSION;
120
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
121
82
/* Used for passing in values through all the callback functions */
122
/* Used for passing in values through the Avahi callback functions */
83
123
typedef struct {
84
124
AvahiSimplePoll *simple_poll;
85
125
AvahiServer *server;
86
126
gnutls_certificate_credentials_t cred;
87
127
unsigned int dh_bits;
128
gnutls_dh_params_t dh_params;
88
129
const char *priority;
130
gpgme_ctx_t ctx;
89
131
} mandos_context;
90
132
133
/* global context so signal handler can reach it*/
134
mandos_context mc = { .simple_poll = NULL, .server = NULL,
135
.dh_bits = 1024, .priority = "SECURE256"
136
":!CTYPE-X.509:+CTYPE-OPENPGP" };
137
138
/*
139
* Make additional room in "buffer" for at least BUFFER_SIZE
140
* additional bytes. "buffer_capacity" is how much is currently
141
* allocated, "buffer_length" is how much is already used.
142
*/
143
size_t incbuffer(char **buffer, size_t buffer_length,
144
size_t buffer_capacity){
145
if(buffer_length + BUFFER_SIZE > buffer_capacity){
146
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
147
if(buffer == NULL){
148
return 0;
149
}
150
buffer_capacity += BUFFER_SIZE;
151
}
152
return buffer_capacity;
153
}
154
91
155
/*
92
* Decrypt OpenPGP data using keyrings in HOMEDIR.
93
* Returns -1 on error
156
* Initialize GPGME.
94
157
*/
95
static ssize_t pgp_packet_decrypt (const char *cryptotext,
96
size_t crypto_size,
97
char **plaintext,
98
const char *homedir){
99
gpgme_data_t dh_crypto, dh_plain;
100
gpgme_ctx_t ctx;
158
static bool init_gpgme(const char *seckey,
159
const char *pubkey, const char *tempdir){
160
int ret;
101
161
gpgme_error_t rc;
102
ssize_t ret;
103
size_t plaintext_capacity = 0;
104
ssize_t plaintext_length = 0;
105
162
gpgme_engine_info_t engine_info;
106
163
107
if (debug){
108
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
164
165
/*
166
* Helper function to insert pub and seckey to the engine keyring.
167
*/
168
bool import_key(const char *filename){
169
int fd;
170
gpgme_data_t pgp_data;
171
172
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
173
if(fd == -1){
174
perror("open");
175
return false;
176
}
177
178
rc = gpgme_data_new_from_fd(&pgp_data, fd);
179
if(rc != GPG_ERR_NO_ERROR){
180
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
181
gpgme_strsource(rc), gpgme_strerror(rc));
182
return false;
183
}
184
185
rc = gpgme_op_import(mc.ctx, pgp_data);
186
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
189
return false;
190
}
191
192
ret = (int)TEMP_FAILURE_RETRY(close(fd));
193
if(ret == -1){
194
perror("close");
195
}
196
gpgme_data_release(pgp_data);
197
return true;
198
}
199
200
if(debug){
201
fprintf(stderr, "Initialize gpgme\n");
109
202
}
110
203
111
204
/* Init GPGME */
112
205
gpgme_check_version(NULL);
113
206
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
114
if (rc != GPG_ERR_NO_ERROR){
207
if(rc != GPG_ERR_NO_ERROR){
115
208
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
116
209
gpgme_strsource(rc), gpgme_strerror(rc));
117
return -1;
210
return false;
118
211
}
119
212
120
/* Set GPGME home directory for the OpenPGP engine only */
121
rc = gpgme_get_engine_info (&engine_info);
122
if (rc != GPG_ERR_NO_ERROR){
213
/* Set GPGME home directory for the OpenPGP engine only */
214
rc = gpgme_get_engine_info(&engine_info);
215
if(rc != GPG_ERR_NO_ERROR){
123
216
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
124
217
gpgme_strsource(rc), gpgme_strerror(rc));
125
return -1;
218
return false;
126
219
}
127
220
while(engine_info != NULL){
128
221
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
129
222
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
130
engine_info->file_name, homedir);
223
engine_info->file_name, tempdir);
131
224
break;
132
225
}
133
226
engine_info = engine_info->next;
134
227
}
135
228
if(engine_info == NULL){
136
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
137
return -1;
229
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
230
return false;
231
}
232
233
/* Create new GPGME "context" */
234
rc = gpgme_new(&(mc.ctx));
235
if(rc != GPG_ERR_NO_ERROR){
236
fprintf(stderr, "bad gpgme_new: %s: %s\n",
237
gpgme_strsource(rc), gpgme_strerror(rc));
238
return false;
239
}
240
241
if(not import_key(pubkey) or not import_key(seckey)){
242
return false;
243
}
244
245
return true;
246
}
247
248
/*
249
* Decrypt OpenPGP data.
250
* Returns -1 on error
251
*/
252
static ssize_t pgp_packet_decrypt(const char *cryptotext,
253
size_t crypto_size,
254
char **plaintext){
255
gpgme_data_t dh_crypto, dh_plain;
256
gpgme_error_t rc;
257
ssize_t ret;
258
size_t plaintext_capacity = 0;
259
ssize_t plaintext_length = 0;
260
261
if(debug){
262
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
138
263
}
139
264
140
265
/* Create new GPGME data buffer from memory cryptotext */
141
266
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
142
267
0);
143
if (rc != GPG_ERR_NO_ERROR){
268
if(rc != GPG_ERR_NO_ERROR){
144
269
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
145
270
gpgme_strsource(rc), gpgme_strerror(rc));
146
271
return -1;
148
273
149
274
/* Create new empty GPGME data buffer for the plaintext */
150
275
rc = gpgme_data_new(&dh_plain);
151
if (rc != GPG_ERR_NO_ERROR){
276
if(rc != GPG_ERR_NO_ERROR){
152
277
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
153
278
gpgme_strsource(rc), gpgme_strerror(rc));
154
279
gpgme_data_release(dh_crypto);
155
280
return -1;
156
281
}
157
282
158
/* Create new GPGME "context" */
159
rc = gpgme_new(&ctx);
160
if (rc != GPG_ERR_NO_ERROR){
161
fprintf(stderr, "bad gpgme_new: %s: %s\n",
162
gpgme_strsource(rc), gpgme_strerror(rc));
163
plaintext_length = -1;
164
goto decrypt_end;
165
}
166
167
283
/* Decrypt data from the cryptotext data buffer to the plaintext
168
284
data buffer */
169
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
170
if (rc != GPG_ERR_NO_ERROR){
285
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
286
if(rc != GPG_ERR_NO_ERROR){
171
287
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
172
288
gpgme_strsource(rc), gpgme_strerror(rc));
173
289
plaintext_length = -1;
290
if(debug){
291
gpgme_decrypt_result_t result;
292
result = gpgme_op_decrypt_result(mc.ctx);
293
if(result == NULL){
294
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
295
} else {
296
fprintf(stderr, "Unsupported algorithm: %s\n",
297
result->unsupported_algorithm);
298
fprintf(stderr, "Wrong key usage: %u\n",
299
result->wrong_key_usage);
300
if(result->file_name != NULL){
301
fprintf(stderr, "File name: %s\n", result->file_name);
302
}
303
gpgme_recipient_t recipient;
304
recipient = result->recipients;
305
if(recipient){
306
while(recipient != NULL){
307
fprintf(stderr, "Public key algorithm: %s\n",
308
gpgme_pubkey_algo_name(recipient->pubkey_algo));
309
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
310
fprintf(stderr, "Secret key available: %s\n",
311
recipient->status == GPG_ERR_NO_SECKEY
312
? "No" : "Yes");
313
recipient = recipient->next;
314
}
315
}
316
}
317
}
174
318
goto decrypt_end;
175
319
}
176
320
178
322
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
179
323
}
180
324
181
if (debug){
182
gpgme_decrypt_result_t result;
183
result = gpgme_op_decrypt_result(ctx);
184
if (result == NULL){
185
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
186
} else {
187
fprintf(stderr, "Unsupported algorithm: %s\n",
188
result->unsupported_algorithm);
189
fprintf(stderr, "Wrong key usage: %d\n",
190
result->wrong_key_usage);
191
if(result->file_name != NULL){
192
fprintf(stderr, "File name: %s\n", result->file_name);
193
}
194
gpgme_recipient_t recipient;
195
recipient = result->recipients;
196
if(recipient){
197
while(recipient != NULL){
198
fprintf(stderr, "Public key algorithm: %s\n",
199
gpgme_pubkey_algo_name(recipient->pubkey_algo));
200
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
201
fprintf(stderr, "Secret key available: %s\n",
202
recipient->status == GPG_ERR_NO_SECKEY
203
? "No" : "Yes");
204
recipient = recipient->next;
205
}
206
}
207
}
208
}
209
210
325
/* Seek back to the beginning of the GPGME plaintext data buffer */
211
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
212
perror("pgpme_data_seek");
326
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
327
perror("gpgme_data_seek");
213
328
plaintext_length = -1;
214
329
goto decrypt_end;
215
330
}
216
331
217
332
*plaintext = NULL;
218
333
while(true){
219
if (plaintext_length + BUFFER_SIZE
220
> (ssize_t) plaintext_capacity){
221
*plaintext = realloc(*plaintext, plaintext_capacity
222
+ BUFFER_SIZE);
223
if (*plaintext == NULL){
224
perror("realloc");
334
plaintext_capacity = incbuffer(plaintext,
335
(size_t)plaintext_length,
336
plaintext_capacity);
337
if(plaintext_capacity == 0){
338
perror("incbuffer");
225
339
plaintext_length = -1;
226
340
goto decrypt_end;
227
}
228
plaintext_capacity += BUFFER_SIZE;
229
341
}
230
342
231
343
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
232
344
BUFFER_SIZE);
233
345
/* Print the data, if any */
234
if (ret == 0){
346
if(ret == 0){
235
347
/* EOF */
236
348
break;
237
349
}
242
354
}
243
355
plaintext_length += ret;
244
356
}
245
357
246
358
if(debug){
247
359
fprintf(stderr, "Decrypted password is: ");
248
360
for(ssize_t i = 0; i < plaintext_length; i++){
261
373
return plaintext_length;
262
374
}
263
375
264
static const char * safer_gnutls_strerror (int value) {
265
const char *ret = gnutls_strerror (value);
266
if (ret == NULL)
376
static const char * safer_gnutls_strerror(int value){
377
const char *ret = gnutls_strerror(value); /* Spurious warning from
378
-Wunreachable-code */
379
if(ret == NULL)
267
380
ret = "(unknown)";
268
381
return ret;
269
382
}
274
387
fprintf(stderr, "GnuTLS: %s", string);
275
388
}
276
389
277
static int initgnutls(mandos_context *mc, gnutls_session_t *session,
278
gnutls_dh_params_t *dh_params){
390
static int init_gnutls_global(const char *pubkeyfilename,
391
const char *seckeyfilename){
279
392
int ret;
280
393
281
394
if(debug){
282
395
fprintf(stderr, "Initializing GnuTLS\n");
283
396
}
284
285
if ((ret = gnutls_global_init ())
286
!= GNUTLS_E_SUCCESS) {
287
fprintf (stderr, "GnuTLS global_init: %s\n",
288
safer_gnutls_strerror(ret));
397
398
ret = gnutls_global_init();
399
if(ret != GNUTLS_E_SUCCESS){
400
fprintf(stderr, "GnuTLS global_init: %s\n",
401
safer_gnutls_strerror(ret));
289
402
return -1;
290
403
}
291
404
292
if (debug){
405
if(debug){
293
406
/* "Use a log level over 10 to enable all debugging options."
294
407
* - GnuTLS manual
295
408
*/
298
411
}
299
412
300
413
/* OpenPGP credentials */
301
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
302
!= GNUTLS_E_SUCCESS) {
303
fprintf (stderr, "GnuTLS memory error: %s\n",
304
safer_gnutls_strerror(ret));
414
gnutls_certificate_allocate_credentials(&mc.cred);
415
if(ret != GNUTLS_E_SUCCESS){
416
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
417
from
418
-Wunreachable-code
419
*/
420
safer_gnutls_strerror(ret));
421
gnutls_global_deinit();
305
422
return -1;
306
423
}
307
424
308
425
if(debug){
309
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
310
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
311
seckeyfile);
426
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
427
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
428
seckeyfilename);
312
429
}
313
430
314
431
ret = gnutls_certificate_set_openpgp_key_file
315
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
316
if (ret != GNUTLS_E_SUCCESS) {
432
(mc.cred, pubkeyfilename, seckeyfilename,
433
GNUTLS_OPENPGP_FMT_BASE64);
434
if(ret != GNUTLS_E_SUCCESS){
317
435
fprintf(stderr,
318
436
"Error[%d] while reading the OpenPGP key pair ('%s',"
319
" '%s')\n", ret, pubkeyfile, seckeyfile);
320
fprintf(stdout, "The GnuTLS error is: %s\n",
437
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
438
fprintf(stderr, "The GnuTLS error is: %s\n",
321
439
safer_gnutls_strerror(ret));
322
return -1;
440
goto globalfail;
323
441
}
324
442
325
443
/* GnuTLS server initialization */
326
ret = gnutls_dh_params_init(dh_params);
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
329
" %s\n", safer_gnutls_strerror(ret));
330
return -1;
331
}
332
ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits);
333
if (ret != GNUTLS_E_SUCCESS) {
334
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
335
safer_gnutls_strerror(ret));
336
return -1;
337
}
338
339
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
340
444
ret = gnutls_dh_params_init(&mc.dh_params);
445
if(ret != GNUTLS_E_SUCCESS){
446
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
447
" %s\n", safer_gnutls_strerror(ret));
448
goto globalfail;
449
}
450
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
451
if(ret != GNUTLS_E_SUCCESS){
452
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
453
safer_gnutls_strerror(ret));
454
goto globalfail;
455
}
456
457
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
458
459
return 0;
460
461
globalfail:
462
463
gnutls_certificate_free_credentials(mc.cred);
464
gnutls_global_deinit();
465
gnutls_dh_params_deinit(mc.dh_params);
466
return -1;
467
}
468
469
static int init_gnutls_session(gnutls_session_t *session){
470
int ret;
341
471
/* GnuTLS session creation */
342
472
ret = gnutls_init(session, GNUTLS_SERVER);
343
if (ret != GNUTLS_E_SUCCESS){
473
if(ret != GNUTLS_E_SUCCESS){
344
474
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
345
475
safer_gnutls_strerror(ret));
346
476
}
347
477
348
478
{
349
479
const char *err;
350
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
351
if (ret != GNUTLS_E_SUCCESS) {
480
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
481
if(ret != GNUTLS_E_SUCCESS){
352
482
fprintf(stderr, "Syntax error at: %s\n", err);
353
483
fprintf(stderr, "GnuTLS error: %s\n",
354
484
safer_gnutls_strerror(ret));
485
gnutls_deinit(*session);
355
486
return -1;
356
487
}
357
488
}
358
489
359
490
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
360
mc->cred);
361
if (ret != GNUTLS_E_SUCCESS) {
491
mc.cred);
492
if(ret != GNUTLS_E_SUCCESS){
362
493
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
363
494
safer_gnutls_strerror(ret));
495
gnutls_deinit(*session);
364
496
return -1;
365
497
}
366
498
367
499
/* ignore client certificate if any. */
368
gnutls_certificate_server_set_request (*session,
369
GNUTLS_CERT_IGNORE);
500
gnutls_certificate_server_set_request(*session,
501
GNUTLS_CERT_IGNORE);
370
502
371
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
503
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
372
504
373
505
return 0;
374
506
}
380
512
/* Called when a Mandos server is found */
381
513
static int start_mandos_communication(const char *ip, uint16_t port,
382
514
AvahiIfIndex if_index,
383
mandos_context *mc){
515
int af){
384
516
int ret, tcp_sd;
385
struct sockaddr_in6 to;
517
ssize_t sret;
518
union {
519
struct sockaddr_in in;
520
struct sockaddr_in6 in6;
521
} to;
386
522
char *buffer = NULL;
387
523
char *decrypted_buffer;
388
524
size_t buffer_length = 0;
389
525
size_t buffer_capacity = 0;
390
526
ssize_t decrypted_buffer_size;
391
size_t written = 0;
527
size_t written;
392
528
int retval = 0;
393
char interface[IF_NAMESIZE];
394
529
gnutls_session_t session;
395
gnutls_dh_params_t dh_params;
396
397
ret = initgnutls (mc, &session, &dh_params);
398
if (ret != 0){
530
int pf; /* Protocol family */
531
532
switch(af){
533
case AF_INET6:
534
pf = PF_INET6;
535
break;
536
case AF_INET:
537
pf = PF_INET;
538
break;
539
default:
540
fprintf(stderr, "Bad address family: %d\n", af);
541
return -1;
542
}
543
544
ret = init_gnutls_session(&session);
545
if(ret != 0){
399
546
return -1;
400
547
}
401
548
402
549
if(debug){
403
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
404
ip, port);
550
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
551
"\n", ip, port);
405
552
}
406
553
407
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
408
if(tcp_sd < 0) {
554
tcp_sd = socket(pf, SOCK_STREAM, 0);
555
if(tcp_sd < 0){
409
556
perror("socket");
410
557
return -1;
411
558
}
412
413
if(debug){
414
if(if_indextoname((unsigned int)if_index, interface) == NULL){
415
perror("if_indextoname");
416
return -1;
417
}
418
fprintf(stderr, "Binding to interface %s\n", interface);
419
}
420
559
421
memset(&to,0,sizeof(to)); /* Spurious warning */
422
to.sin6_family = AF_INET6;
423
/* It would be nice to have a way to detect if we were passed an
424
IPv4 address here. Now we assume an IPv6 address. */
425
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
426
if (ret < 0 ){
560
memset(&to, 0, sizeof(to));
561
if(af == AF_INET6){
562
to.in6.sin6_family = (uint16_t)af;
563
ret = inet_pton(af, ip, &to.in6.sin6_addr);
564
} else { /* IPv4 */
565
to.in.sin_family = (sa_family_t)af;
566
ret = inet_pton(af, ip, &to.in.sin_addr);
567
}
568
if(ret < 0 ){
427
569
perror("inet_pton");
428
570
return -1;
429
571
}
431
573
fprintf(stderr, "Bad address: %s\n", ip);
432
574
return -1;
433
575
}
434
to.sin6_port = htons(port); /* Spurious warning */
435
436
to.sin6_scope_id = (uint32_t)if_index;
576
if(af == AF_INET6){
577
to.in6.sin6_port = htons(port); /* Spurious warnings from
578
-Wconversion and
579
-Wunreachable-code */
580
581
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
582
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
583
-Wunreachable-code*/
584
if(if_index == AVAHI_IF_UNSPEC){
585
fprintf(stderr, "An IPv6 link-local address is incomplete"
586
" without a network interface\n");
587
return -1;
588
}
589
/* Set the network interface number as scope */
590
to.in6.sin6_scope_id = (uint32_t)if_index;
591
}
592
} else {
593
to.in.sin_port = htons(port); /* Spurious warnings from
594
-Wconversion and
595
-Wunreachable-code */
596
}
437
597
438
598
if(debug){
439
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
440
char addrstr[INET6_ADDRSTRLEN] = "";
441
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
442
sizeof(addrstr)) == NULL){
599
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
600
char interface[IF_NAMESIZE];
601
if(if_indextoname((unsigned int)if_index, interface) == NULL){
602
perror("if_indextoname");
603
} else {
604
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
605
ip, interface, port);
606
}
607
} else {
608
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
609
port);
610
}
611
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
612
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
613
const char *pcret;
614
if(af == AF_INET6){
615
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
616
sizeof(addrstr));
617
} else {
618
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
619
sizeof(addrstr));
620
}
621
if(pcret == NULL){
443
622
perror("inet_ntop");
444
623
} else {
445
624
if(strcmp(addrstr, ip) != 0){
448
627
}
449
628
}
450
629
451
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
452
if (ret < 0){
630
if(af == AF_INET6){
631
ret = connect(tcp_sd, &to.in6, sizeof(to));
632
} else {
633
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
634
}
635
if(ret < 0){
453
636
perror("connect");
454
637
return -1;
455
638
}
456
639
640
const char *out = mandos_protocol_version;
641
written = 0;
642
while(true){
643
size_t out_size = strlen(out);
644
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
645
out_size - written));
646
if(ret == -1){
647
perror("write");
648
retval = -1;
649
goto mandos_end;
650
}
651
written += (size_t)ret;
652
if(written < out_size){
653
continue;
654
} else {
655
if(out == mandos_protocol_version){
656
written = 0;
657
out = "\r\n";
658
} else {
659
break;
660
}
661
}
662
}
663
457
664
if(debug){
458
665
fprintf(stderr, "Establishing TLS session with %s\n", ip);
459
666
}
460
667
461
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
462
463
ret = gnutls_handshake (session);
464
465
if (ret != GNUTLS_E_SUCCESS){
668
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
669
670
do{
671
ret = gnutls_handshake(session);
672
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
673
674
if(ret != GNUTLS_E_SUCCESS){
466
675
if(debug){
467
676
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
468
gnutls_perror (ret);
677
gnutls_perror(ret);
469
678
}
470
679
retval = -1;
471
680
goto mandos_end;
474
683
/* Read OpenPGP packet that contains the wanted password */
475
684
476
685
if(debug){
477
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
686
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
478
687
ip);
479
688
}
480
689
481
690
while(true){
482
if (buffer_length + BUFFER_SIZE > buffer_capacity){
483
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
484
if (buffer == NULL){
485
perror("realloc");
486
retval = -1;
487
goto mandos_end;
488
}
489
buffer_capacity += BUFFER_SIZE;
691
buffer_capacity = incbuffer(&buffer, buffer_length,
692
buffer_capacity);
693
if(buffer_capacity == 0){
694
perror("incbuffer");
695
retval = -1;
696
goto mandos_end;
490
697
}
491
698
492
ret = gnutls_record_recv(session, buffer+buffer_length,
493
BUFFER_SIZE);
494
if (ret == 0){
699
sret = gnutls_record_recv(session, buffer+buffer_length,
700
BUFFER_SIZE);
701
if(sret == 0){
495
702
break;
496
703
}
497
if (ret < 0){
498
switch(ret){
704
if(sret < 0){
705
switch(sret){
499
706
case GNUTLS_E_INTERRUPTED:
500
707
case GNUTLS_E_AGAIN:
501
708
break;
502
709
case GNUTLS_E_REHANDSHAKE:
503
ret = gnutls_handshake (session);
504
if (ret < 0){
710
do{
711
ret = gnutls_handshake(session);
712
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
713
if(ret < 0){
505
714
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
506
gnutls_perror (ret);
715
gnutls_perror(ret);
507
716
retval = -1;
508
717
goto mandos_end;
509
718
}
512
721
fprintf(stderr, "Unknown error while reading data from"
513
722
" encrypted session with Mandos server\n");
514
723
retval = -1;
515
gnutls_bye (session, GNUTLS_SHUT_RDWR);
724
gnutls_bye(session, GNUTLS_SHUT_RDWR);
516
725
goto mandos_end;
517
726
}
518
727
} else {
519
buffer_length += (size_t) ret;
728
buffer_length += (size_t) sret;
520
729
}
521
730
}
522
731
524
733
fprintf(stderr, "Closing TLS session\n");
525
734
}
526
735
527
gnutls_bye (session, GNUTLS_SHUT_RDWR);
736
gnutls_bye(session, GNUTLS_SHUT_RDWR);
528
737
529
if (buffer_length > 0){
738
if(buffer_length > 0){
530
739
decrypted_buffer_size = pgp_packet_decrypt(buffer,
531
740
buffer_length,
532
&decrypted_buffer,
533
keydir);
534
if (decrypted_buffer_size >= 0){
741
&decrypted_buffer);
742
if(decrypted_buffer_size >= 0){
743
written = 0;
535
744
while(written < (size_t) decrypted_buffer_size){
536
ret = (int)fwrite (decrypted_buffer + written, 1,
537
(size_t)decrypted_buffer_size - written,
538
stdout);
745
ret = (int)fwrite(decrypted_buffer + written, 1,
746
(size_t)decrypted_buffer_size - written,
747
stdout);
539
748
if(ret == 0 and ferror(stdout)){
540
749
if(debug){
541
750
fprintf(stderr, "Error writing encrypted data: %s\n",
550
759
} else {
551
760
retval = -1;
552
761
}
762
} else {
763
retval = -1;
553
764
}
554
765
555
766
/* Shutdown procedure */
556
767
557
768
mandos_end:
558
769
free(buffer);
559
close(tcp_sd);
560
gnutls_deinit (session);
561
gnutls_certificate_free_credentials (mc->cred);
562
gnutls_global_deinit ();
770
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
771
if(ret == -1){
772
perror("close");
773
}
774
gnutls_deinit(session);
563
775
return retval;
564
776
}
565
777
566
778
static void resolve_callback(AvahiSServiceResolver *r,
567
779
AvahiIfIndex interface,
568
AVAHI_GCC_UNUSED AvahiProtocol protocol,
780
AvahiProtocol proto,
569
781
AvahiResolverEvent event,
570
782
const char *name,
571
783
const char *type,
576
788
AVAHI_GCC_UNUSED AvahiStringList *txt,
577
789
AVAHI_GCC_UNUSED AvahiLookupResultFlags
578
790
flags,
579
void* userdata) {
580
mandos_context *mc = userdata;
581
assert(r); /* Spurious warning */
791
__attribute__((unused)) void* userdata){
792
assert(r);
582
793
583
794
/* Called whenever a service has been resolved successfully or
584
795
timed out */
585
796
586
switch (event) {
797
switch(event){
587
798
default:
588
799
case AVAHI_RESOLVER_FAILURE:
589
800
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
590
801
" of type '%s' in domain '%s': %s\n", name, type, domain,
591
avahi_strerror(avahi_server_errno(mc->server)));
802
avahi_strerror(avahi_server_errno(mc.server)));
592
803
break;
593
804
594
805
case AVAHI_RESOLVER_FOUND:
596
807
char ip[AVAHI_ADDRESS_STR_MAX];
597
808
avahi_address_snprint(ip, sizeof(ip), address);
598
809
if(debug){
599
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
600
" port %d\n", name, host_name, ip, interface, port);
810
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
811
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
812
ip, (intmax_t)interface, port);
601
813
}
602
int ret = start_mandos_communication(ip, port, interface, mc);
603
if (ret == 0){
604
exit(EXIT_SUCCESS);
814
int ret = start_mandos_communication(ip, port, interface,
815
avahi_proto_to_af(proto));
816
if(ret == 0){
817
avahi_simple_poll_quit(mc.simple_poll);
605
818
}
606
819
}
607
820
}
608
821
avahi_s_service_resolver_free(r);
609
822
}
610
823
611
static void browse_callback( AvahiSServiceBrowser *b,
612
AvahiIfIndex interface,
613
AvahiProtocol protocol,
614
AvahiBrowserEvent event,
615
const char *name,
616
const char *type,
617
const char *domain,
618
AVAHI_GCC_UNUSED AvahiLookupResultFlags
619
flags,
620
void* userdata) {
621
mandos_context *mc = userdata;
622
assert(b); /* Spurious warning */
824
static void browse_callback(AvahiSServiceBrowser *b,
825
AvahiIfIndex interface,
826
AvahiProtocol protocol,
827
AvahiBrowserEvent event,
828
const char *name,
829
const char *type,
830
const char *domain,
831
AVAHI_GCC_UNUSED AvahiLookupResultFlags
832
flags,
833
__attribute__((unused)) void* userdata){
834
assert(b);
623
835
624
836
/* Called whenever a new services becomes available on the LAN or
625
837
is removed from the LAN */
626
838
627
switch (event) {
839
switch(event){
628
840
default:
629
841
case AVAHI_BROWSER_FAILURE:
630
842
631
843
fprintf(stderr, "(Avahi browser) %s\n",
632
avahi_strerror(avahi_server_errno(mc->server)));
633
avahi_simple_poll_quit(mc->simple_poll);
844
avahi_strerror(avahi_server_errno(mc.server)));
845
avahi_simple_poll_quit(mc.simple_poll);
634
846
return;
635
847
636
848
case AVAHI_BROWSER_NEW:
639
851
the callback function is called the Avahi server will free the
640
852
resolver for us. */
641
853
642
if (!(avahi_s_service_resolver_new(mc->server, interface,
854
if(!(avahi_s_service_resolver_new(mc.server, interface,
643
855
protocol, name, type, domain,
644
856
AVAHI_PROTO_INET6, 0,
645
resolve_callback, mc)))
857
resolve_callback, NULL)))
646
858
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
647
name, avahi_strerror(avahi_server_errno(mc->server)));
859
name, avahi_strerror(avahi_server_errno(mc.server)));
648
860
break;
649
861
650
862
case AVAHI_BROWSER_REMOVE:
659
871
}
660
872
}
661
873
662
/* Combines file name and path and returns the malloced new
663
string. some sane checks could/should be added */
664
static const char *combinepath(const char *first, const char *second){
665
size_t f_len = strlen(first);
666
size_t s_len = strlen(second);
667
char *tmp = malloc(f_len + s_len + 2);
668
if (tmp == NULL){
669
return NULL;
670
}
671
if(f_len > 0){
672
memcpy(tmp, first, f_len); /* Spurious warning */
673
}
674
tmp[f_len] = '/';
675
if(s_len > 0){
676
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
677
}
678
tmp[f_len + 1 + s_len] = '\0';
679
return tmp;
874
/* stop main loop after sigterm has been called */
875
static void handle_sigterm(__attribute__((unused)) int sig){
876
int old_errno = errno;
877
avahi_simple_poll_quit(mc.simple_poll);
878
errno = old_errno;
680
879
}
681
880
682
683
881
int main(int argc, char *argv[]){
684
AvahiSServiceBrowser *sb = NULL;
685
int error;
686
int ret;
687
int exitcode = EXIT_SUCCESS;
688
const char *interface = "eth0";
689
struct ifreq network;
690
int sd;
691
char *connect_to = NULL;
692
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
693
mandos_context mc = { .simple_poll = NULL, .server = NULL,
694
.dh_bits = 1024, .priority = "SECURE256"};
695
696
{
697
/* Temporary int to get the address of for getopt_long */
698
int debug_int = debug ? 1 : 0;
699
while (true){
700
struct option long_options[] = {
701
{"debug", no_argument, &debug_int, 1},
702
{"connect", required_argument, NULL, 'c'},
703
{"interface", required_argument, NULL, 'i'},
704
{"keydir", required_argument, NULL, 'd'},
705
{"seckey", required_argument, NULL, 's'},
706
{"pubkey", required_argument, NULL, 'p'},
707
{"dh-bits", required_argument, NULL, 'D'},
708
{"priority", required_argument, NULL, 'P'},
709
{0, 0, 0, 0} };
710
711
int option_index = 0;
712
ret = getopt_long (argc, argv, "i:", long_options,
713
&option_index);
714
715
if (ret == -1){
716
break;
717
}
718
719
switch(ret){
720
case 0:
721
break;
722
case 'i':
723
interface = optarg;
724
break;
725
case 'c':
726
connect_to = optarg;
727
break;
728
case 'd':
729
keydir = optarg;
730
break;
731
case 'p':
732
pubkeyfile = optarg;
733
break;
734
case 's':
735
seckeyfile = optarg;
736
break;
737
case 'D':
738
errno = 0;
739
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
740
if (errno){
741
perror("strtol");
742
exit(EXIT_FAILURE);
882
AvahiSServiceBrowser *sb = NULL;
883
int error;
884
int ret;
885
intmax_t tmpmax;
886
int numchars;
887
int exitcode = EXIT_SUCCESS;
888
const char *interface = "eth0";
889
struct ifreq network;
890
int sd;
891
uid_t uid;
892
gid_t gid;
893
char *connect_to = NULL;
894
char tempdir[] = "/tmp/mandosXXXXXX";
895
bool tempdir_created = false;
896
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
897
const char *seckey = PATHDIR "/" SECKEY;
898
const char *pubkey = PATHDIR "/" PUBKEY;
899
900
bool gnutls_initialized = false;
901
bool gpgme_initialized = false;
902
double delay = 2.5;
903
904
struct sigaction old_sigterm_action;
905
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
906
907
{
908
struct argp_option options[] = {
909
{ .name = "debug", .key = 128,
910
.doc = "Debug mode", .group = 3 },
911
{ .name = "connect", .key = 'c',
912
.arg = "ADDRESS:PORT",
913
.doc = "Connect directly to a specific Mandos server",
914
.group = 1 },
915
{ .name = "interface", .key = 'i',
916
.arg = "NAME",
917
.doc = "Network interface that will be used to search for"
918
" Mandos servers",
919
.group = 1 },
920
{ .name = "seckey", .key = 's',
921
.arg = "FILE",
922
.doc = "OpenPGP secret key file base name",
923
.group = 1 },
924
{ .name = "pubkey", .key = 'p',
925
.arg = "FILE",
926
.doc = "OpenPGP public key file base name",
927
.group = 2 },
928
{ .name = "dh-bits", .key = 129,
929
.arg = "BITS",
930
.doc = "Bit length of the prime number used in the"
931
" Diffie-Hellman key exchange",
932
.group = 2 },
933
{ .name = "priority", .key = 130,
934
.arg = "STRING",
935
.doc = "GnuTLS priority string for the TLS handshake",
936
.group = 1 },
937
{ .name = "delay", .key = 131,
938
.arg = "SECONDS",
939
.doc = "Maximum delay to wait for interface startup",
940
.group = 2 },
941
{ .name = NULL }
942
};
943
944
error_t parse_opt(int key, char *arg,
945
struct argp_state *state){
946
switch(key){
947
case 128: /* --debug */
948
debug = true;
949
break;
950
case 'c': /* --connect */
951
connect_to = arg;
952
break;
953
case 'i': /* --interface */
954
interface = arg;
955
break;
956
case 's': /* --seckey */
957
seckey = arg;
958
break;
959
case 'p': /* --pubkey */
960
pubkey = arg;
961
break;
962
case 129: /* --dh-bits */
963
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
964
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
965
or arg[numchars] != '\0'){
966
fprintf(stderr, "Bad number of DH bits\n");
967
exit(EXIT_FAILURE);
968
}
969
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
970
break;
971
case 130: /* --priority */
972
mc.priority = arg;
973
break;
974
case 131: /* --delay */
975
ret = sscanf(arg, "%lf%n", &delay, &numchars);
976
if(ret < 1 or arg[numchars] != '\0'){
977
fprintf(stderr, "Bad delay\n");
978
exit(EXIT_FAILURE);
979
}
980
break;
981
case ARGP_KEY_ARG:
982
argp_usage(state);
983
case ARGP_KEY_END:
984
break;
985
default:
986
return ARGP_ERR_UNKNOWN;
987
}
988
return 0;
989
}
990
991
struct argp argp = { .options = options, .parser = parse_opt,
992
.args_doc = "",
993
.doc = "Mandos client -- Get and decrypt"
994
" passwords from a Mandos server" };
995
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
996
if(ret == ARGP_ERR_UNKNOWN){
997
fprintf(stderr, "Unknown error while parsing arguments\n");
998
exitcode = EXIT_FAILURE;
999
goto end;
1000
}
1001
}
1002
1003
if(not debug){
1004
avahi_set_log_function(empty_log);
1005
}
1006
1007
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1008
from the signal handler */
1009
/* Initialize the pseudo-RNG for Avahi */
1010
srand((unsigned int) time(NULL));
1011
mc.simple_poll = avahi_simple_poll_new();
1012
if(mc.simple_poll == NULL){
1013
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1014
exitcode = EXIT_FAILURE;
1015
goto end;
1016
}
1017
1018
sigemptyset(&sigterm_action.sa_mask);
1019
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1020
if(ret == -1){
1021
perror("sigaddset");
1022
exitcode = EXIT_FAILURE;
1023
goto end;
1024
}
1025
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1026
if(ret == -1){
1027
perror("sigaction");
1028
exitcode = EXIT_FAILURE;
1029
goto end;
1030
}
1031
1032
1033
/* If the interface is down, bring it up */
1034
if(interface[0] != '\0'){
1035
#ifdef __linux__
1036
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1037
messages to mess up the prompt */
1038
ret = klogctl(8, NULL, 5);
1039
bool restore_loglevel = true;
1040
if(ret == -1){
1041
restore_loglevel = false;
1042
perror("klogctl");
1043
}
1044
#endif
1045
1046
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1047
if(sd < 0){
1048
perror("socket");
1049
exitcode = EXIT_FAILURE;
1050
#ifdef __linux__
1051
if(restore_loglevel){
1052
ret = klogctl(7, NULL, 0);
1053
if(ret == -1){
1054
perror("klogctl");
1055
}
1056
}
1057
#endif
1058
goto end;
1059
}
1060
strcpy(network.ifr_name, interface);
1061
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1062
if(ret == -1){
1063
perror("ioctl SIOCGIFFLAGS");
1064
#ifdef __linux__
1065
if(restore_loglevel){
1066
ret = klogctl(7, NULL, 0);
1067
if(ret == -1){
1068
perror("klogctl");
1069
}
1070
}
1071
#endif
1072
exitcode = EXIT_FAILURE;
1073
goto end;
1074
}
1075
if((network.ifr_flags & IFF_UP) == 0){
1076
network.ifr_flags |= IFF_UP;
1077
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1078
if(ret == -1){
1079
perror("ioctl SIOCSIFFLAGS");
1080
exitcode = EXIT_FAILURE;
1081
#ifdef __linux__
1082
if(restore_loglevel){
1083
ret = klogctl(7, NULL, 0);
1084
if(ret == -1){
1085
perror("klogctl");
743
1086
}
744
break;
745
case 'P':
746
mc.priority = optarg;
747
break;
748
case '?':
749
default:
750
/* getopt_long() has already printed a message about the
751
unrcognized option, so just exit. */
752
exit(EXIT_FAILURE);
753
1087
}
754
}
755
/* Set the global debug flag from the temporary int */
756
debug = debug_int ? true : false;
757
}
758
759
pubkeyfile = combinepath(keydir, pubkeyfile);
760
if (pubkeyfile == NULL){
761
perror("combinepath");
762
exitcode = EXIT_FAILURE;
763
goto end;
764
}
765
766
seckeyfile = combinepath(keydir, seckeyfile);
767
if (seckeyfile == NULL){
768
perror("combinepath");
769
goto end;
770
}
771
1088
#endif
1089
goto end;
1090
}
1091
}
1092
/* sleep checking until interface is running */
1093
for(int i=0; i < delay * 4; i++){
1094
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1095
if(ret == -1){
1096
perror("ioctl SIOCGIFFLAGS");
1097
} else if(network.ifr_flags & IFF_RUNNING){
1098
break;
1099
}
1100
struct timespec sleeptime = { .tv_nsec = 250000000 };
1101
ret = nanosleep(&sleeptime, NULL);
1102
if(ret == -1 and errno != EINTR){
1103
perror("nanosleep");
1104
}
1105
}
1106
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1107
if(ret == -1){
1108
perror("close");
1109
}
1110
#ifdef __linux__
1111
if(restore_loglevel){
1112
/* Restores kernel loglevel to default */
1113
ret = klogctl(7, NULL, 0);
1114
if(ret == -1){
1115
perror("klogctl");
1116
}
1117
}
1118
#endif
1119
}
1120
1121
uid = getuid();
1122
gid = getgid();
1123
1124
errno = 0;
1125
setgid(gid);
1126
if(ret == -1){
1127
perror("setgid");
1128
}
1129
1130
ret = setuid(uid);
1131
if(ret == -1){
1132
perror("setuid");
1133
}
1134
1135
ret = init_gnutls_global(pubkey, seckey);
1136
if(ret == -1){
1137
fprintf(stderr, "init_gnutls_global failed\n");
1138
exitcode = EXIT_FAILURE;
1139
goto end;
1140
} else {
1141
gnutls_initialized = true;
1142
}
1143
1144
if(mkdtemp(tempdir) == NULL){
1145
perror("mkdtemp");
1146
goto end;
1147
}
1148
tempdir_created = true;
1149
1150
if(not init_gpgme(pubkey, seckey, tempdir)){
1151
fprintf(stderr, "init_gpgme failed\n");
1152
exitcode = EXIT_FAILURE;
1153
goto end;
1154
} else {
1155
gpgme_initialized = true;
1156
}
1157
1158
if(interface[0] != '\0'){
772
1159
if_index = (AvahiIfIndex) if_nametoindex(interface);
773
1160
if(if_index == 0){
774
1161
fprintf(stderr, "No such interface: \"%s\"\n", interface);
775
exit(EXIT_FAILURE);
776
}
777
778
if(connect_to != NULL){
779
/* Connect directly, do not use Zeroconf */
780
/* (Mainly meant for debugging) */
781
char *address = strrchr(connect_to, ':');
782
if(address == NULL){
783
fprintf(stderr, "No colon in address\n");
784
exit(EXIT_FAILURE);
785
}
786
errno = 0;
787
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
788
if(errno){
789
perror("Bad port number");
790
exit(EXIT_FAILURE);
791
}
792
*address = '\0';
793
address = connect_to;
794
ret = start_mandos_communication(address, port, if_index, &mc);
795
if(ret < 0){
796
exit(EXIT_FAILURE);
797
} else {
798
exit(EXIT_SUCCESS);
799
}
800
}
801
802
/* If the interface is down, bring it up */
803
{
804
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
805
if(sd < 0) {
806
perror("socket");
807
exitcode = EXIT_FAILURE;
808
goto end;
809
}
810
strcpy(network.ifr_name, interface); /* Spurious warning */
811
ret = ioctl(sd, SIOCGIFFLAGS, &network);
812
if(ret == -1){
813
perror("ioctl SIOCGIFFLAGS");
814
exitcode = EXIT_FAILURE;
815
goto end;
816
}
817
if((network.ifr_flags & IFF_UP) == 0){
818
network.ifr_flags |= IFF_UP;
819
ret = ioctl(sd, SIOCSIFFLAGS, &network);
820
if(ret == -1){
821
perror("ioctl SIOCSIFFLAGS");
822
exitcode = EXIT_FAILURE;
823
goto end;
824
}
825
}
826
close(sd);
827
}
828
829
if (not debug){
830
avahi_set_log_function(empty_log);
831
}
832
833
/* Initialize the pseudo-RNG for Avahi */
834
srand((unsigned int) time(NULL));
835
836
/* Allocate main Avahi loop object */
837
mc.simple_poll = avahi_simple_poll_new();
838
if (mc.simple_poll == NULL) {
839
fprintf(stderr, "Avahi: Failed to create simple poll"
840
" object.\n");
841
exitcode = EXIT_FAILURE;
842
goto end;
843
}
844
845
{
846
AvahiServerConfig config;
847
/* Do not publish any local Zeroconf records */
848
avahi_server_config_init(&config);
849
config.publish_hinfo = 0;
850
config.publish_addresses = 0;
851
config.publish_workstation = 0;
852
config.publish_domain = 0;
853
854
/* Allocate a new server */
855
mc.server = avahi_server_new(avahi_simple_poll_get
856
(mc.simple_poll), &config, NULL,
857
NULL, &error);
858
859
/* Free the Avahi configuration data */
860
avahi_server_config_free(&config);
861
}
862
863
/* Check if creating the Avahi server object succeeded */
864
if (mc.server == NULL) {
865
fprintf(stderr, "Failed to create Avahi server: %s\n",
866
avahi_strerror(error));
867
exitcode = EXIT_FAILURE;
868
goto end;
869
}
870
871
/* Create the Avahi service browser */
872
sb = avahi_s_service_browser_new(mc.server, if_index,
873
AVAHI_PROTO_INET6,
874
"_mandos._tcp", NULL, 0,
875
browse_callback, &mc);
876
if (sb == NULL) {
877
fprintf(stderr, "Failed to create service browser: %s\n",
878
avahi_strerror(avahi_server_errno(mc.server)));
879
exitcode = EXIT_FAILURE;
880
goto end;
881
}
882
883
/* Run the main loop */
884
885
if (debug){
886
fprintf(stderr, "Starting Avahi loop search\n");
887
}
888
889
avahi_simple_poll_loop(mc.simple_poll);
890
1162
exitcode = EXIT_FAILURE;
1163
goto end;
1164
}
1165
}
1166
1167
if(connect_to != NULL){
1168
/* Connect directly, do not use Zeroconf */
1169
/* (Mainly meant for debugging) */
1170
char *address = strrchr(connect_to, ':');
1171
if(address == NULL){
1172
fprintf(stderr, "No colon in address\n");
1173
exitcode = EXIT_FAILURE;
1174
goto end;
1175
}
1176
uint16_t port;
1177
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1178
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1179
or address[numchars+1] != '\0'){
1180
fprintf(stderr, "Bad port number\n");
1181
exitcode = EXIT_FAILURE;
1182
goto end;
1183
}
1184
port = (uint16_t)tmpmax;
1185
*address = '\0';
1186
address = connect_to;
1187
/* Colon in address indicates IPv6 */
1188
int af;
1189
if(strchr(address, ':') != NULL){
1190
af = AF_INET6;
1191
} else {
1192
af = AF_INET;
1193
}
1194
ret = start_mandos_communication(address, port, if_index,
1195
af);
1196
if(ret < 0){
1197
exitcode = EXIT_FAILURE;
1198
} else {
1199
exitcode = EXIT_SUCCESS;
1200
}
1201
goto end;
1202
}
1203
1204
{
1205
AvahiServerConfig config;
1206
/* Do not publish any local Zeroconf records */
1207
avahi_server_config_init(&config);
1208
config.publish_hinfo = 0;
1209
config.publish_addresses = 0;
1210
config.publish_workstation = 0;
1211
config.publish_domain = 0;
1212
1213
/* Allocate a new server */
1214
mc.server = avahi_server_new(avahi_simple_poll_get
1215
(mc.simple_poll), &config, NULL,
1216
NULL, &error);
1217
1218
/* Free the Avahi configuration data */
1219
avahi_server_config_free(&config);
1220
}
1221
1222
/* Check if creating the Avahi server object succeeded */
1223
if(mc.server == NULL){
1224
fprintf(stderr, "Failed to create Avahi server: %s\n",
1225
avahi_strerror(error));
1226
exitcode = EXIT_FAILURE;
1227
goto end;
1228
}
1229
1230
/* Create the Avahi service browser */
1231
sb = avahi_s_service_browser_new(mc.server, if_index,
1232
AVAHI_PROTO_INET6, "_mandos._tcp",
1233
NULL, 0, browse_callback, NULL);
1234
if(sb == NULL){
1235
fprintf(stderr, "Failed to create service browser: %s\n",
1236
avahi_strerror(avahi_server_errno(mc.server)));
1237
exitcode = EXIT_FAILURE;
1238
goto end;
1239
}
1240
1241
/* Run the main loop */
1242
1243
if(debug){
1244
fprintf(stderr, "Starting Avahi loop search\n");
1245
}
1246
1247
avahi_simple_poll_loop(mc.simple_poll);
1248
891
1249
end:
892
893
if (debug){
894
fprintf(stderr, "%s exiting\n", argv[0]);
895
}
896
897
/* Cleanup things */
898
if (sb != NULL)
899
avahi_s_service_browser_free(sb);
900
901
if (mc.server != NULL)
902
avahi_server_free(mc.server);
903
904
if (mc.simple_poll != NULL)
905
avahi_simple_poll_free(mc.simple_poll);
906
free(pubkeyfile);
907
free(seckeyfile);
908
909
return exitcode;
1250
1251
if(debug){
1252
fprintf(stderr, "%s exiting\n", argv[0]);
1253
}
1254
1255
/* Cleanup things */
1256
if(sb != NULL)
1257
avahi_s_service_browser_free(sb);
1258
1259
if(mc.server != NULL)
1260
avahi_server_free(mc.server);
1261
1262
if(mc.simple_poll != NULL)
1263
avahi_simple_poll_free(mc.simple_poll);
1264
1265
if(gnutls_initialized){
1266
gnutls_certificate_free_credentials(mc.cred);
1267
gnutls_global_deinit();
1268
gnutls_dh_params_deinit(mc.dh_params);
1269
}
1270
1271
if(gpgme_initialized){
1272
gpgme_release(mc.ctx);
1273
}
1274
1275
/* Removes the temp directory used by GPGME */
1276
if(tempdir_created){
1277
DIR *d;
1278
struct dirent *direntry;
1279
d = opendir(tempdir);
1280
if(d == NULL){
1281
if(errno != ENOENT){
1282
perror("opendir");
1283
}
1284
} else {
1285
while(true){
1286
direntry = readdir(d);
1287
if(direntry == NULL){
1288
break;
1289
}
1290
/* Skip "." and ".." */
1291
if(direntry->d_name[0] == '.'
1292
and (direntry->d_name[1] == '\0'
1293
or (direntry->d_name[1] == '.'
1294
and direntry->d_name[2] == '\0'))){
1295
continue;
1296
}
1297
char *fullname = NULL;
1298
ret = asprintf(&fullname, "%s/%s", tempdir,
1299
direntry->d_name);
1300
if(ret < 0){
1301
perror("asprintf");
1302
continue;
1303
}
1304
ret = remove(fullname);
1305
if(ret == -1){
1306
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1307
strerror(errno));
1308
}
1309
free(fullname);
1310
}
1311
closedir(d);
1312
}
1313
ret = rmdir(tempdir);
1314
if(ret == -1 and errno != ENOENT){
1315
perror("rmdir");
1316
}
1317
}
1318
1319
return exitcode;
910
1320
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0