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237.2.116
(compared to revision 24.1.12)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-08-27 23:12:09 UTC
- mto: (24.1.139 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 264.
- Revision ID: teddy@fukt.bsnet.se-20090827231209-ry9loqws0gr7ze4g
* plugins.d/mandos-client.c (quit_now): Move up declaration before
first use.
(resolve_callback, ): Check "quit_now" flag.
(main): Renamed "interface_taken_up" to "take_down_interface" for
clarity. Check existence of interface before taking it up.
Set "take_down_interface" and "tempdir_created" flags before
any action is taken, to make sure cleanup is never missed.
Check "quit_now" flag throughout.
first use.
(resolve_callback, ): Check "quit_now" flag.
(main): Renamed "interface_taken_up" to "take_down_interface" for
clarity. Check existence of interface before taking it up.
Set "take_down_interface" and "tempdir_created" flags before
any action is taken, to make sure cleanup is never missed.
Check "quit_now" flag throughout.
- 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
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>
38
#include <assert.h>
39
#include <stdlib.h>
40
#include <time.h>
41
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
44
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
45
SIOCSIFFLAGS */
46
68
SIOCSIFFLAGS, if_indextoname(),
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
78
#include <argp.h> /* struct argp_option, error_t, struct
79
argp_state, struct argp,
80
argp_parse(), ARGP_KEY_ARG,
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__ */
89
90
/* Avahi */
91
/* All Avahi types, constants and functions
92
Avahi*, avahi_*,
93
AVAHI_* */
47
94
#include <avahi-core/core.h>
48
95
#include <avahi-core/lookup.h>
49
96
#include <avahi-core/log.h>
51
98
#include <avahi-common/malloc.h>
52
99
#include <avahi-common/error.h>
53
100
54
/* Mandos client part */
55
#include <sys/types.h> /* socket(), inet_pton() */
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
struct in6_addr, inet_pton() */
58
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
59
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
60
61
#include <unistd.h> /* close() */
62
#include <netinet/in.h>
63
#include <stdbool.h> /* true */
64
#include <string.h> /* memset */
65
#include <arpa/inet.h> /* inet_pton() */
66
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
101
/* GnuTLS */
102
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
103
functions:
104
gnutls_*
105
init_gnutls_session(),
106
GNUTLS_* */
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
68
110
69
111
/* GPGME */
70
#include <errno.h> /* perror() */
71
#include <gpgme.h>
72
73
/* getopt_long */
74
#include <getopt.h>
112
#include <gpgme.h> /* All GPGME types, constants and
113
functions:
114
gpgme_*
115
GPGME_PROTOCOL_OpenPGP,
116
GPG_ERR_NO_* */
75
117
76
118
#define BUFFER_SIZE 256
77
119
78
static const char *keydir = "/conf/conf.d/mandos";
79
static const char *pubkeyfile = "pubkey.txt";
80
static const char *seckeyfile = "seckey.txt";
120
#define PATHDIR "/conf/conf.d/mandos"
121
#define SECKEY "seckey.txt"
122
#define PUBKEY "pubkey.txt"
81
123
82
124
bool debug = false;
83
84
const char mandos_protocol_version[] = "1";
85
86
/* Used for passing in values through all the callback functions */
125
static const char mandos_protocol_version[] = "1";
126
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
128
129
/* Used for passing in values through the Avahi callback functions */
87
130
typedef struct {
88
131
AvahiSimplePoll *simple_poll;
89
132
AvahiServer *server;
90
133
gnutls_certificate_credentials_t cred;
91
134
unsigned int dh_bits;
135
gnutls_dh_params_t dh_params;
92
136
const char *priority;
137
gpgme_ctx_t ctx;
93
138
} mandos_context;
94
139
95
size_t adjustbuffer(char **buffer, size_t buffer_length,
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
144
145
/*
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
148
* "buffer_length" is how much is already used.
149
*/
150
size_t incbuffer(char **buffer, size_t buffer_length,
96
151
size_t buffer_capacity){
97
if (buffer_length + BUFFER_SIZE > buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
98
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
99
if (buffer == NULL){
154
if(buffer == NULL){
100
155
return 0;
101
156
}
102
157
buffer_capacity += BUFFER_SIZE;
105
160
}
106
161
107
162
/*
108
* Decrypt OpenPGP data using keyrings in HOMEDIR.
109
* Returns -1 on error
163
* Initialize GPGME.
110
164
*/
111
static ssize_t pgp_packet_decrypt (const char *cryptotext,
112
size_t crypto_size,
113
char **plaintext,
114
const char *homedir){
115
gpgme_data_t dh_crypto, dh_plain;
116
gpgme_ctx_t ctx;
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
117
168
gpgme_error_t rc;
118
ssize_t ret;
119
size_t plaintext_capacity = 0;
120
ssize_t plaintext_length = 0;
121
169
gpgme_engine_info_t engine_info;
122
170
123
if (debug){
124
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");
125
209
}
126
210
127
211
/* Init GPGME */
128
212
gpgme_check_version(NULL);
129
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
130
if (rc != GPG_ERR_NO_ERROR){
214
if(rc != GPG_ERR_NO_ERROR){
131
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
132
216
gpgme_strsource(rc), gpgme_strerror(rc));
133
return -1;
217
return false;
134
218
}
135
219
136
/* Set GPGME home directory for the OpenPGP engine only */
137
rc = gpgme_get_engine_info (&engine_info);
138
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){
139
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
140
224
gpgme_strsource(rc), gpgme_strerror(rc));
141
return -1;
225
return false;
142
226
}
143
227
while(engine_info != NULL){
144
228
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
145
229
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
146
engine_info->file_name, homedir);
230
engine_info->file_name, tempdir);
147
231
break;
148
232
}
149
233
engine_info = engine_info->next;
150
234
}
151
235
if(engine_info == NULL){
152
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
153
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");
154
270
}
155
271
156
272
/* Create new GPGME data buffer from memory cryptotext */
157
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
158
274
0);
159
if (rc != GPG_ERR_NO_ERROR){
275
if(rc != GPG_ERR_NO_ERROR){
160
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
161
277
gpgme_strsource(rc), gpgme_strerror(rc));
162
278
return -1;
164
280
165
281
/* Create new empty GPGME data buffer for the plaintext */
166
282
rc = gpgme_data_new(&dh_plain);
167
if (rc != GPG_ERR_NO_ERROR){
283
if(rc != GPG_ERR_NO_ERROR){
168
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
169
285
gpgme_strsource(rc), gpgme_strerror(rc));
170
286
gpgme_data_release(dh_crypto);
171
287
return -1;
172
288
}
173
289
174
/* Create new GPGME "context" */
175
rc = gpgme_new(&ctx);
176
if (rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_new: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
179
plaintext_length = -1;
180
goto decrypt_end;
181
}
182
183
290
/* Decrypt data from the cryptotext data buffer to the plaintext
184
291
data buffer */
185
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
186
if (rc != GPG_ERR_NO_ERROR){
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
187
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
188
295
gpgme_strsource(rc), gpgme_strerror(rc));
189
296
plaintext_length = -1;
190
goto decrypt_end;
191
}
192
193
if(debug){
194
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
195
}
196
197
if (debug){
198
gpgme_decrypt_result_t result;
199
result = gpgme_op_decrypt_result(ctx);
200
if (result == NULL){
201
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
202
} else {
203
fprintf(stderr, "Unsupported algorithm: %s\n",
204
result->unsupported_algorithm);
205
fprintf(stderr, "Wrong key usage: %d\n",
206
result->wrong_key_usage);
207
if(result->file_name != NULL){
208
fprintf(stderr, "File name: %s\n", result->file_name);
209
}
210
gpgme_recipient_t recipient;
211
recipient = result->recipients;
212
if(recipient){
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;
213
312
while(recipient != NULL){
214
313
fprintf(stderr, "Public key algorithm: %s\n",
215
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
221
320
}
222
321
}
223
322
}
323
goto decrypt_end;
324
}
325
326
if(debug){
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
224
328
}
225
329
226
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
227
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
228
perror("pgpme_data_seek");
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
332
perror("gpgme_data_seek");
229
333
plaintext_length = -1;
230
334
goto decrypt_end;
231
335
}
232
336
233
337
*plaintext = NULL;
234
338
while(true){
235
plaintext_capacity = adjustbuffer(plaintext, (size_t)plaintext_length,
339
plaintext_capacity = incbuffer(plaintext,
340
(size_t)plaintext_length,
236
341
plaintext_capacity);
237
if (plaintext_capacity == 0){
238
perror("adjustbuffer");
342
if(plaintext_capacity == 0){
343
perror("incbuffer");
239
344
plaintext_length = -1;
240
345
goto decrypt_end;
241
346
}
243
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
244
349
BUFFER_SIZE);
245
350
/* Print the data, if any */
246
if (ret == 0){
351
if(ret == 0){
247
352
/* EOF */
248
353
break;
249
354
}
254
359
}
255
360
plaintext_length += ret;
256
361
}
257
362
258
363
if(debug){
259
364
fprintf(stderr, "Decrypted password is: ");
260
365
for(ssize_t i = 0; i < plaintext_length; i++){
273
378
return plaintext_length;
274
379
}
275
380
276
static const char * safer_gnutls_strerror (int value) {
277
const char *ret = gnutls_strerror (value);
278
if (ret == NULL)
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
384
if(ret == NULL)
279
385
ret = "(unknown)";
280
386
return ret;
281
387
}
286
392
fprintf(stderr, "GnuTLS: %s", string);
287
393
}
288
394
289
static int initgnutls(mandos_context *mc, gnutls_session_t *session,
290
gnutls_dh_params_t *dh_params){
395
static int init_gnutls_global(const char *pubkeyfilename,
396
const char *seckeyfilename){
291
397
int ret;
292
398
293
399
if(debug){
294
400
fprintf(stderr, "Initializing GnuTLS\n");
295
401
}
296
297
if ((ret = gnutls_global_init ())
298
!= GNUTLS_E_SUCCESS) {
299
fprintf (stderr, "GnuTLS global_init: %s\n",
300
safer_gnutls_strerror(ret));
402
403
ret = gnutls_global_init();
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
301
407
return -1;
302
408
}
303
409
304
if (debug){
410
if(debug){
305
411
/* "Use a log level over 10 to enable all debugging options."
306
412
* - GnuTLS manual
307
413
*/
310
416
}
311
417
312
418
/* OpenPGP credentials */
313
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
314
!= GNUTLS_E_SUCCESS) {
315
fprintf (stderr, "GnuTLS memory error: %s\n",
316
safer_gnutls_strerror(ret));
419
gnutls_certificate_allocate_credentials(&mc.cred);
420
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
426
gnutls_global_deinit();
317
427
return -1;
318
428
}
319
429
320
430
if(debug){
321
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
322
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
323
seckeyfile);
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
324
434
}
325
435
326
436
ret = gnutls_certificate_set_openpgp_key_file
327
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
328
if (ret != GNUTLS_E_SUCCESS) {
437
(mc.cred, pubkeyfilename, seckeyfilename,
438
GNUTLS_OPENPGP_FMT_BASE64);
439
if(ret != GNUTLS_E_SUCCESS){
329
440
fprintf(stderr,
330
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
331
" '%s')\n", ret, pubkeyfile, seckeyfile);
332
fprintf(stdout, "The GnuTLS error is: %s\n",
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
333
444
safer_gnutls_strerror(ret));
334
return -1;
445
goto globalfail;
335
446
}
336
447
337
448
/* GnuTLS server initialization */
338
ret = gnutls_dh_params_init(dh_params);
339
if (ret != GNUTLS_E_SUCCESS) {
340
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
341
" %s\n", safer_gnutls_strerror(ret));
342
return -1;
343
}
344
ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits);
345
if (ret != GNUTLS_E_SUCCESS) {
346
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
347
safer_gnutls_strerror(ret));
348
return -1;
349
}
350
351
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
352
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
453
goto globalfail;
454
}
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
459
goto globalfail;
460
}
461
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
463
464
return 0;
465
466
globalfail:
467
468
gnutls_certificate_free_credentials(mc.cred);
469
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
471
return -1;
472
}
473
474
static int init_gnutls_session(gnutls_session_t *session){
475
int ret;
353
476
/* GnuTLS session creation */
354
477
ret = gnutls_init(session, GNUTLS_SERVER);
355
if (ret != GNUTLS_E_SUCCESS){
478
if(ret != GNUTLS_E_SUCCESS){
356
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
357
480
safer_gnutls_strerror(ret));
358
481
}
359
482
360
483
{
361
484
const char *err;
362
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
363
if (ret != GNUTLS_E_SUCCESS) {
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
486
if(ret != GNUTLS_E_SUCCESS){
364
487
fprintf(stderr, "Syntax error at: %s\n", err);
365
488
fprintf(stderr, "GnuTLS error: %s\n",
366
489
safer_gnutls_strerror(ret));
490
gnutls_deinit(*session);
367
491
return -1;
368
492
}
369
493
}
370
494
371
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
372
mc->cred);
373
if (ret != GNUTLS_E_SUCCESS) {
496
mc.cred);
497
if(ret != GNUTLS_E_SUCCESS){
374
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
375
499
safer_gnutls_strerror(ret));
500
gnutls_deinit(*session);
376
501
return -1;
377
502
}
378
503
379
504
/* ignore client certificate if any. */
380
gnutls_certificate_server_set_request (*session,
381
GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
382
507
383
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
384
509
385
510
return 0;
386
511
}
392
517
/* Called when a Mandos server is found */
393
518
static int start_mandos_communication(const char *ip, uint16_t port,
394
519
AvahiIfIndex if_index,
395
mandos_context *mc){
520
int af){
396
521
int ret, tcp_sd;
397
struct sockaddr_in6 to;
522
ssize_t sret;
523
union {
524
struct sockaddr_in in;
525
struct sockaddr_in6 in6;
526
} to;
398
527
char *buffer = NULL;
399
528
char *decrypted_buffer;
400
529
size_t buffer_length = 0;
402
531
ssize_t decrypted_buffer_size;
403
532
size_t written;
404
533
int retval = 0;
405
char interface[IF_NAMESIZE];
406
534
gnutls_session_t session;
407
gnutls_dh_params_t dh_params;
408
409
ret = initgnutls (mc, &session, &dh_params);
410
if (ret != 0){
535
int pf; /* Protocol family */
536
537
switch(af){
538
case AF_INET6:
539
pf = PF_INET6;
540
break;
541
case AF_INET:
542
pf = PF_INET;
543
break;
544
default:
545
fprintf(stderr, "Bad address family: %d\n", af);
546
return -1;
547
}
548
549
ret = init_gnutls_session(&session);
550
if(ret != 0){
411
551
return -1;
412
552
}
413
553
414
554
if(debug){
415
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
416
ip, port);
555
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
556
"\n", ip, port);
417
557
}
418
558
419
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
420
if(tcp_sd < 0) {
559
tcp_sd = socket(pf, SOCK_STREAM, 0);
560
if(tcp_sd < 0){
421
561
perror("socket");
422
562
return -1;
423
563
}
424
425
if(debug){
426
if(if_indextoname((unsigned int)if_index, interface) == NULL){
427
perror("if_indextoname");
428
return -1;
429
}
430
fprintf(stderr, "Binding to interface %s\n", interface);
431
}
432
564
433
memset(&to,0,sizeof(to)); /* Spurious warning */
434
to.sin6_family = AF_INET6;
435
/* It would be nice to have a way to detect if we were passed an
436
IPv4 address here. Now we assume an IPv6 address. */
437
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
438
if (ret < 0 ){
565
memset(&to, 0, sizeof(to));
566
if(af == AF_INET6){
567
to.in6.sin6_family = (sa_family_t)af;
568
ret = inet_pton(af, ip, &to.in6.sin6_addr);
569
} else { /* IPv4 */
570
to.in.sin_family = (sa_family_t)af;
571
ret = inet_pton(af, ip, &to.in.sin_addr);
572
}
573
if(ret < 0 ){
439
574
perror("inet_pton");
440
575
return -1;
441
576
}
443
578
fprintf(stderr, "Bad address: %s\n", ip);
444
579
return -1;
445
580
}
446
to.sin6_port = htons(port); /* Spurious warning */
447
448
to.sin6_scope_id = (uint32_t)if_index;
581
if(af == AF_INET6){
582
to.in6.sin6_port = htons(port); /* Spurious warnings from
583
-Wconversion and
584
-Wunreachable-code */
585
586
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
587
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
588
-Wunreachable-code*/
589
if(if_index == AVAHI_IF_UNSPEC){
590
fprintf(stderr, "An IPv6 link-local address is incomplete"
591
" without a network interface\n");
592
return -1;
593
}
594
/* Set the network interface number as scope */
595
to.in6.sin6_scope_id = (uint32_t)if_index;
596
}
597
} else {
598
to.in.sin_port = htons(port); /* Spurious warnings from
599
-Wconversion and
600
-Wunreachable-code */
601
}
449
602
450
603
if(debug){
451
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
452
char addrstr[INET6_ADDRSTRLEN] = "";
453
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
454
sizeof(addrstr)) == NULL){
604
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
605
char interface[IF_NAMESIZE];
606
if(if_indextoname((unsigned int)if_index, interface) == NULL){
607
perror("if_indextoname");
608
} else {
609
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
610
ip, interface, port);
611
}
612
} else {
613
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
614
port);
615
}
616
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
617
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
618
const char *pcret;
619
if(af == AF_INET6){
620
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
621
sizeof(addrstr));
622
} else {
623
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
624
sizeof(addrstr));
625
}
626
if(pcret == NULL){
455
627
perror("inet_ntop");
456
628
} else {
457
629
if(strcmp(addrstr, ip) != 0){
460
632
}
461
633
}
462
634
463
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
464
if (ret < 0){
635
if(af == AF_INET6){
636
ret = connect(tcp_sd, &to.in6, sizeof(to));
637
} else {
638
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
639
}
640
if(ret < 0){
465
641
perror("connect");
466
642
return -1;
467
643
}
468
644
469
645
const char *out = mandos_protocol_version;
470
646
written = 0;
471
while (true){
647
while(true){
472
648
size_t out_size = strlen(out);
473
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
649
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
474
650
out_size - written));
475
if (ret == -1){
651
if(ret == -1){
476
652
perror("write");
477
653
retval = -1;
478
654
goto mandos_end;
481
657
if(written < out_size){
482
658
continue;
483
659
} else {
484
if (out == mandos_protocol_version){
660
if(out == mandos_protocol_version){
485
661
written = 0;
486
662
out = "\r\n";
487
663
} else {
489
665
}
490
666
}
491
667
}
492
668
493
669
if(debug){
494
670
fprintf(stderr, "Establishing TLS session with %s\n", ip);
495
671
}
496
672
497
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
498
499
ret = gnutls_handshake (session);
500
501
if (ret != GNUTLS_E_SUCCESS){
673
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
674
675
do{
676
ret = gnutls_handshake(session);
677
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
678
679
if(ret != GNUTLS_E_SUCCESS){
502
680
if(debug){
503
681
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
504
gnutls_perror (ret);
682
gnutls_perror(ret);
505
683
}
506
684
retval = -1;
507
685
goto mandos_end;
510
688
/* Read OpenPGP packet that contains the wanted password */
511
689
512
690
if(debug){
513
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
691
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
514
692
ip);
515
693
}
516
694
517
695
while(true){
518
buffer_capacity = adjustbuffer(&buffer, buffer_length, buffer_capacity);
519
if (buffer_capacity == 0){
520
perror("adjustbuffer");
696
buffer_capacity = incbuffer(&buffer, buffer_length,
697
buffer_capacity);
698
if(buffer_capacity == 0){
699
perror("incbuffer");
521
700
retval = -1;
522
701
goto mandos_end;
523
702
}
524
703
525
ret = gnutls_record_recv(session, buffer+buffer_length,
526
BUFFER_SIZE);
527
if (ret == 0){
704
sret = gnutls_record_recv(session, buffer+buffer_length,
705
BUFFER_SIZE);
706
if(sret == 0){
528
707
break;
529
708
}
530
if (ret < 0){
531
switch(ret){
709
if(sret < 0){
710
switch(sret){
532
711
case GNUTLS_E_INTERRUPTED:
533
712
case GNUTLS_E_AGAIN:
534
713
break;
535
714
case GNUTLS_E_REHANDSHAKE:
536
ret = gnutls_handshake (session);
537
if (ret < 0){
715
do{
716
ret = gnutls_handshake(session);
717
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
718
if(ret < 0){
538
719
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
539
gnutls_perror (ret);
720
gnutls_perror(ret);
540
721
retval = -1;
541
722
goto mandos_end;
542
723
}
545
726
fprintf(stderr, "Unknown error while reading data from"
546
727
" encrypted session with Mandos server\n");
547
728
retval = -1;
548
gnutls_bye (session, GNUTLS_SHUT_RDWR);
729
gnutls_bye(session, GNUTLS_SHUT_RDWR);
549
730
goto mandos_end;
550
731
}
551
732
} else {
552
buffer_length += (size_t) ret;
733
buffer_length += (size_t) sret;
553
734
}
554
735
}
555
736
557
738
fprintf(stderr, "Closing TLS session\n");
558
739
}
559
740
560
gnutls_bye (session, GNUTLS_SHUT_RDWR);
741
gnutls_bye(session, GNUTLS_SHUT_RDWR);
561
742
562
if (buffer_length > 0){
743
if(buffer_length > 0){
563
744
decrypted_buffer_size = pgp_packet_decrypt(buffer,
564
745
buffer_length,
565
&decrypted_buffer,
566
keydir);
567
if (decrypted_buffer_size >= 0){
746
&decrypted_buffer);
747
if(decrypted_buffer_size >= 0){
568
748
written = 0;
569
749
while(written < (size_t) decrypted_buffer_size){
570
ret = (int)fwrite (decrypted_buffer + written, 1,
571
(size_t)decrypted_buffer_size - written,
572
stdout);
750
ret = (int)fwrite(decrypted_buffer + written, 1,
751
(size_t)decrypted_buffer_size - written,
752
stdout);
573
753
if(ret == 0 and ferror(stdout)){
574
754
if(debug){
575
755
fprintf(stderr, "Error writing encrypted data: %s\n",
584
764
} else {
585
765
retval = -1;
586
766
}
767
} else {
768
retval = -1;
587
769
}
588
770
589
771
/* Shutdown procedure */
590
772
591
773
mandos_end:
592
774
free(buffer);
593
close(tcp_sd);
594
gnutls_deinit (session);
595
gnutls_certificate_free_credentials (mc->cred);
596
gnutls_global_deinit ();
775
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
776
if(ret == -1){
777
perror("close");
778
}
779
gnutls_deinit(session);
597
780
return retval;
598
781
}
599
782
783
sig_atomic_t quit_now = 0;
784
600
785
static void resolve_callback(AvahiSServiceResolver *r,
601
786
AvahiIfIndex interface,
602
AVAHI_GCC_UNUSED AvahiProtocol protocol,
787
AvahiProtocol proto,
603
788
AvahiResolverEvent event,
604
789
const char *name,
605
790
const char *type,
610
795
AVAHI_GCC_UNUSED AvahiStringList *txt,
611
796
AVAHI_GCC_UNUSED AvahiLookupResultFlags
612
797
flags,
613
void* userdata) {
614
mandos_context *mc = userdata;
615
assert(r); /* Spurious warning */
798
AVAHI_GCC_UNUSED void* userdata){
799
assert(r);
616
800
617
801
/* Called whenever a service has been resolved successfully or
618
802
timed out */
619
803
620
switch (event) {
804
if(quit_now){
805
return;
806
}
807
808
switch(event){
621
809
default:
622
810
case AVAHI_RESOLVER_FAILURE:
623
811
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
624
812
" of type '%s' in domain '%s': %s\n", name, type, domain,
625
avahi_strerror(avahi_server_errno(mc->server)));
813
avahi_strerror(avahi_server_errno(mc.server)));
626
814
break;
627
815
628
816
case AVAHI_RESOLVER_FOUND:
630
818
char ip[AVAHI_ADDRESS_STR_MAX];
631
819
avahi_address_snprint(ip, sizeof(ip), address);
632
820
if(debug){
633
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
634
" port %d\n", name, host_name, ip, interface, port);
821
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
822
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
823
ip, (intmax_t)interface, port);
635
824
}
636
int ret = start_mandos_communication(ip, port, interface, mc);
637
if (ret == 0){
638
exit(EXIT_SUCCESS);
825
int ret = start_mandos_communication(ip, port, interface,
826
avahi_proto_to_af(proto));
827
if(ret == 0){
828
avahi_simple_poll_quit(mc.simple_poll);
639
829
}
640
830
}
641
831
}
642
832
avahi_s_service_resolver_free(r);
643
833
}
644
834
645
static void browse_callback( AvahiSServiceBrowser *b,
646
AvahiIfIndex interface,
647
AvahiProtocol protocol,
648
AvahiBrowserEvent event,
649
const char *name,
650
const char *type,
651
const char *domain,
652
AVAHI_GCC_UNUSED AvahiLookupResultFlags
653
flags,
654
void* userdata) {
655
mandos_context *mc = userdata;
656
assert(b); /* Spurious warning */
835
static void browse_callback(AvahiSServiceBrowser *b,
836
AvahiIfIndex interface,
837
AvahiProtocol protocol,
838
AvahiBrowserEvent event,
839
const char *name,
840
const char *type,
841
const char *domain,
842
AVAHI_GCC_UNUSED AvahiLookupResultFlags
843
flags,
844
AVAHI_GCC_UNUSED void* userdata){
845
assert(b);
657
846
658
847
/* Called whenever a new services becomes available on the LAN or
659
848
is removed from the LAN */
660
849
661
switch (event) {
850
switch(event){
662
851
default:
663
852
case AVAHI_BROWSER_FAILURE:
664
853
665
854
fprintf(stderr, "(Avahi browser) %s\n",
666
avahi_strerror(avahi_server_errno(mc->server)));
667
avahi_simple_poll_quit(mc->simple_poll);
855
avahi_strerror(avahi_server_errno(mc.server)));
856
avahi_simple_poll_quit(mc.simple_poll);
668
857
return;
669
858
670
859
case AVAHI_BROWSER_NEW:
673
862
the callback function is called the Avahi server will free the
674
863
resolver for us. */
675
864
676
if (!(avahi_s_service_resolver_new(mc->server, interface,
677
protocol, name, type, domain,
678
AVAHI_PROTO_INET6, 0,
679
resolve_callback, mc)))
865
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
866
name, type, domain, protocol, 0,
867
resolve_callback, NULL) == NULL)
680
868
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
681
name, avahi_strerror(avahi_server_errno(mc->server)));
869
name, avahi_strerror(avahi_server_errno(mc.server)));
682
870
break;
683
871
684
872
case AVAHI_BROWSER_REMOVE:
693
881
}
694
882
}
695
883
696
/* Combines file name and path and returns the malloced new
697
string. some sane checks could/should be added */
698
static const char *combinepath(const char *first, const char *second){
699
size_t f_len = strlen(first);
700
size_t s_len = strlen(second);
701
char *tmp = malloc(f_len + s_len + 2);
702
if (tmp == NULL){
703
return NULL;
704
}
705
if(f_len > 0){
706
memcpy(tmp, first, f_len); /* Spurious warning */
707
}
708
tmp[f_len] = '/';
709
if(s_len > 0){
710
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
711
}
712
tmp[f_len + 1 + s_len] = '\0';
713
return tmp;
884
/* stop main loop after sigterm has been called */
885
static void handle_sigterm(__attribute__((unused)) int sig){
886
if(quit_now){
887
return;
888
}
889
quit_now = 1;
890
int old_errno = errno;
891
if(mc.simple_poll != NULL){
892
avahi_simple_poll_quit(mc.simple_poll);
893
}
894
errno = old_errno;
714
895
}
715
896
716
717
897
int main(int argc, char *argv[]){
718
AvahiSServiceBrowser *sb = NULL;
719
int error;
720
int ret;
721
int exitcode = EXIT_SUCCESS;
722
const char *interface = "eth0";
723
struct ifreq network;
724
int sd;
725
char *connect_to = NULL;
726
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
727
mandos_context mc = { .simple_poll = NULL, .server = NULL,
728
.dh_bits = 1024, .priority = "SECURE256"};
898
AvahiSServiceBrowser *sb = NULL;
899
int error;
900
int ret;
901
intmax_t tmpmax;
902
char *tmp;
903
int exitcode = EXIT_SUCCESS;
904
const char *interface = "eth0";
905
struct ifreq network;
906
int sd = -1;
907
bool take_down_interface = false;
908
uid_t uid;
909
gid_t gid;
910
char *connect_to = NULL;
911
char tempdir[] = "/tmp/mandosXXXXXX";
912
bool tempdir_created = false;
913
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
914
const char *seckey = PATHDIR "/" SECKEY;
915
const char *pubkey = PATHDIR "/" PUBKEY;
916
917
bool gnutls_initialized = false;
918
bool gpgme_initialized = false;
919
float delay = 2.5f;
920
921
struct sigaction old_sigterm_action;
922
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
923
924
{
925
struct argp_option options[] = {
926
{ .name = "debug", .key = 128,
927
.doc = "Debug mode", .group = 3 },
928
{ .name = "connect", .key = 'c',
929
.arg = "ADDRESS:PORT",
930
.doc = "Connect directly to a specific Mandos server",
931
.group = 1 },
932
{ .name = "interface", .key = 'i',
933
.arg = "NAME",
934
.doc = "Network interface that will be used to search for"
935
" Mandos servers",
936
.group = 1 },
937
{ .name = "seckey", .key = 's',
938
.arg = "FILE",
939
.doc = "OpenPGP secret key file base name",
940
.group = 1 },
941
{ .name = "pubkey", .key = 'p',
942
.arg = "FILE",
943
.doc = "OpenPGP public key file base name",
944
.group = 2 },
945
{ .name = "dh-bits", .key = 129,
946
.arg = "BITS",
947
.doc = "Bit length of the prime number used in the"
948
" Diffie-Hellman key exchange",
949
.group = 2 },
950
{ .name = "priority", .key = 130,
951
.arg = "STRING",
952
.doc = "GnuTLS priority string for the TLS handshake",
953
.group = 1 },
954
{ .name = "delay", .key = 131,
955
.arg = "SECONDS",
956
.doc = "Maximum delay to wait for interface startup",
957
.group = 2 },
958
{ .name = NULL }
959
};
729
960
730
{
731
/* Temporary int to get the address of for getopt_long */
732
int debug_int = debug ? 1 : 0;
733
while (true){
734
struct option long_options[] = {
735
{"debug", no_argument, &debug_int, 1},
736
{"connect", required_argument, NULL, 'c'},
737
{"interface", required_argument, NULL, 'i'},
738
{"keydir", required_argument, NULL, 'd'},
739
{"seckey", required_argument, NULL, 's'},
740
{"pubkey", required_argument, NULL, 'p'},
741
{"dh-bits", required_argument, NULL, 'D'},
742
{"priority", required_argument, NULL, 'P'},
743
{0, 0, 0, 0} };
744
745
int option_index = 0;
746
ret = getopt_long (argc, argv, "i:", long_options,
747
&option_index);
748
749
if (ret == -1){
750
break;
751
}
752
753
switch(ret){
754
case 0:
755
break;
756
case 'i':
757
interface = optarg;
758
break;
759
case 'c':
760
connect_to = optarg;
761
break;
762
case 'd':
763
keydir = optarg;
764
break;
765
case 'p':
766
pubkeyfile = optarg;
767
break;
768
case 's':
769
seckeyfile = optarg;
770
break;
771
case 'D':
772
errno = 0;
773
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
774
if (errno){
775
perror("strtol");
776
exit(EXIT_FAILURE);
777
}
778
break;
779
case 'P':
780
mc.priority = optarg;
781
break;
782
case '?':
783
default:
784
/* getopt_long() has already printed a message about the
785
unrcognized option, so just exit. */
786
exit(EXIT_FAILURE);
787
}
961
error_t parse_opt(int key, char *arg,
962
struct argp_state *state){
963
switch(key){
964
case 128: /* --debug */
965
debug = true;
966
break;
967
case 'c': /* --connect */
968
connect_to = arg;
969
break;
970
case 'i': /* --interface */
971
interface = arg;
972
break;
973
case 's': /* --seckey */
974
seckey = arg;
975
break;
976
case 'p': /* --pubkey */
977
pubkey = arg;
978
break;
979
case 129: /* --dh-bits */
980
errno = 0;
981
tmpmax = strtoimax(arg, &tmp, 10);
982
if(errno != 0 or tmp == arg or *tmp != '\0'
983
or tmpmax != (typeof(mc.dh_bits))tmpmax){
984
fprintf(stderr, "Bad number of DH bits\n");
985
exit(EXIT_FAILURE);
986
}
987
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
988
break;
989
case 130: /* --priority */
990
mc.priority = arg;
991
break;
992
case 131: /* --delay */
993
errno = 0;
994
delay = strtof(arg, &tmp);
995
if(errno != 0 or tmp == arg or *tmp != '\0'){
996
fprintf(stderr, "Bad delay\n");
997
exit(EXIT_FAILURE);
998
}
999
break;
1000
case ARGP_KEY_ARG:
1001
argp_usage(state);
1002
case ARGP_KEY_END:
1003
break;
1004
default:
1005
return ARGP_ERR_UNKNOWN;
788
1006
}
789
/* Set the global debug flag from the temporary int */
790
debug = debug_int ? true : false;
1007
return 0;
791
1008
}
792
1009
793
pubkeyfile = combinepath(keydir, pubkeyfile);
794
if (pubkeyfile == NULL){
795
perror("combinepath");
1010
struct argp argp = { .options = options, .parser = parse_opt,
1011
.args_doc = "",
1012
.doc = "Mandos client -- Get and decrypt"
1013
" passwords from a Mandos server" };
1014
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1015
if(ret == ARGP_ERR_UNKNOWN){
1016
fprintf(stderr, "Unknown error while parsing arguments\n");
796
1017
exitcode = EXIT_FAILURE;
797
1018
goto end;
798
1019
}
799
800
seckeyfile = combinepath(keydir, seckeyfile);
801
if (seckeyfile == NULL){
802
perror("combinepath");
803
goto end;
804
}
805
1020
}
1021
1022
if(not debug){
1023
avahi_set_log_function(empty_log);
1024
}
1025
1026
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1027
from the signal handler */
1028
/* Initialize the pseudo-RNG for Avahi */
1029
srand((unsigned int) time(NULL));
1030
mc.simple_poll = avahi_simple_poll_new();
1031
if(mc.simple_poll == NULL){
1032
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1033
exitcode = EXIT_FAILURE;
1034
goto end;
1035
}
1036
1037
sigemptyset(&sigterm_action.sa_mask);
1038
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1039
if(ret == -1){
1040
perror("sigaddset");
1041
exitcode = EXIT_FAILURE;
1042
goto end;
1043
}
1044
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1045
if(ret == -1){
1046
perror("sigaddset");
1047
exitcode = EXIT_FAILURE;
1048
goto end;
1049
}
1050
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1051
if(ret == -1){
1052
perror("sigaddset");
1053
exitcode = EXIT_FAILURE;
1054
goto end;
1055
}
1056
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1057
if(ret == -1){
1058
perror("sigaction");
1059
exitcode = EXIT_FAILURE;
1060
goto end;
1061
}
1062
1063
/* If the interface is down, bring it up */
1064
if(interface[0] != '\0'){
806
1065
if_index = (AvahiIfIndex) if_nametoindex(interface);
807
1066
if(if_index == 0){
808
1067
fprintf(stderr, "No such interface: \"%s\"\n", interface);
809
exit(EXIT_FAILURE);
810
}
811
812
if(connect_to != NULL){
813
/* Connect directly, do not use Zeroconf */
814
/* (Mainly meant for debugging) */
815
char *address = strrchr(connect_to, ':');
816
if(address == NULL){
817
fprintf(stderr, "No colon in address\n");
818
exit(EXIT_FAILURE);
819
}
820
errno = 0;
821
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
822
if(errno){
823
perror("Bad port number");
824
exit(EXIT_FAILURE);
825
}
826
*address = '\0';
827
address = connect_to;
828
ret = start_mandos_communication(address, port, if_index, &mc);
829
if(ret < 0){
830
exit(EXIT_FAILURE);
831
} else {
832
exit(EXIT_SUCCESS);
833
}
834
}
835
836
/* If the interface is down, bring it up */
837
{
838
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
839
if(sd < 0) {
840
perror("socket");
1068
exitcode = EXIT_FAILURE;
1069
goto end;
1070
}
1071
1072
if(quit_now){
1073
goto end;
1074
}
1075
1076
#ifdef __linux__
1077
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1078
messages to mess up the prompt */
1079
ret = klogctl(8, NULL, 5);
1080
bool restore_loglevel = true;
1081
if(ret == -1){
1082
restore_loglevel = false;
1083
perror("klogctl");
1084
}
1085
#endif /* __linux__ */
1086
1087
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1088
if(sd < 0){
1089
perror("socket");
1090
exitcode = EXIT_FAILURE;
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
goto end;
1100
}
1101
strcpy(network.ifr_name, interface);
1102
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1103
if(ret == -1){
1104
perror("ioctl SIOCGIFFLAGS");
1105
#ifdef __linux__
1106
if(restore_loglevel){
1107
ret = klogctl(7, NULL, 0);
1108
if(ret == -1){
1109
perror("klogctl");
1110
}
1111
}
1112
#endif /* __linux__ */
1113
exitcode = EXIT_FAILURE;
1114
goto end;
1115
}
1116
if((network.ifr_flags & IFF_UP) == 0){
1117
network.ifr_flags |= IFF_UP;
1118
take_down_interface = true;
1119
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1120
if(ret == -1){
1121
take_down_interface = false;
1122
perror("ioctl SIOCSIFFLAGS");
841
1123
exitcode = EXIT_FAILURE;
1124
#ifdef __linux__
1125
if(restore_loglevel){
1126
ret = klogctl(7, NULL, 0);
1127
if(ret == -1){
1128
perror("klogctl");
1129
}
1130
}
1131
#endif /* __linux__ */
842
1132
goto end;
843
1133
}
844
strcpy(network.ifr_name, interface); /* Spurious warning */
1134
}
1135
/* sleep checking until interface is running */
1136
for(int i=0; i < delay * 4; i++){
845
1137
ret = ioctl(sd, SIOCGIFFLAGS, &network);
846
1138
if(ret == -1){
847
1139
perror("ioctl SIOCGIFFLAGS");
848
exitcode = EXIT_FAILURE;
849
goto end;
850
}
851
if((network.ifr_flags & IFF_UP) == 0){
852
network.ifr_flags |= IFF_UP;
853
ret = ioctl(sd, SIOCSIFFLAGS, &network);
854
if(ret == -1){
855
perror("ioctl SIOCSIFFLAGS");
856
exitcode = EXIT_FAILURE;
857
goto end;
858
}
859
}
860
close(sd);
861
}
862
863
if (not debug){
864
avahi_set_log_function(empty_log);
865
}
866
867
/* Initialize the pseudo-RNG for Avahi */
868
srand((unsigned int) time(NULL));
869
870
/* Allocate main Avahi loop object */
871
mc.simple_poll = avahi_simple_poll_new();
872
if (mc.simple_poll == NULL) {
873
fprintf(stderr, "Avahi: Failed to create simple poll"
874
" object.\n");
875
exitcode = EXIT_FAILURE;
876
goto end;
877
}
878
879
{
880
AvahiServerConfig config;
881
/* Do not publish any local Zeroconf records */
882
avahi_server_config_init(&config);
883
config.publish_hinfo = 0;
884
config.publish_addresses = 0;
885
config.publish_workstation = 0;
886
config.publish_domain = 0;
887
888
/* Allocate a new server */
889
mc.server = avahi_server_new(avahi_simple_poll_get
890
(mc.simple_poll), &config, NULL,
891
NULL, &error);
892
893
/* Free the Avahi configuration data */
894
avahi_server_config_free(&config);
895
}
896
897
/* Check if creating the Avahi server object succeeded */
898
if (mc.server == NULL) {
899
fprintf(stderr, "Failed to create Avahi server: %s\n",
900
avahi_strerror(error));
901
exitcode = EXIT_FAILURE;
902
goto end;
903
}
904
905
/* Create the Avahi service browser */
906
sb = avahi_s_service_browser_new(mc.server, if_index,
907
AVAHI_PROTO_INET6,
908
"_mandos._tcp", NULL, 0,
909
browse_callback, &mc);
910
if (sb == NULL) {
911
fprintf(stderr, "Failed to create service browser: %s\n",
912
avahi_strerror(avahi_server_errno(mc.server)));
913
exitcode = EXIT_FAILURE;
914
goto end;
915
}
916
917
/* Run the main loop */
918
919
if (debug){
920
fprintf(stderr, "Starting Avahi loop search\n");
921
}
922
923
avahi_simple_poll_loop(mc.simple_poll);
924
1140
} else if(network.ifr_flags & IFF_RUNNING){
1141
break;
1142
}
1143
struct timespec sleeptime = { .tv_nsec = 250000000 };
1144
ret = nanosleep(&sleeptime, NULL);
1145
if(ret == -1 and errno != EINTR){
1146
perror("nanosleep");
1147
}
1148
}
1149
if(not take_down_interface){
1150
/* We won't need the socket anymore */
1151
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1152
if(ret == -1){
1153
perror("close");
1154
}
1155
}
1156
#ifdef __linux__
1157
if(restore_loglevel){
1158
/* Restores kernel loglevel to default */
1159
ret = klogctl(7, NULL, 0);
1160
if(ret == -1){
1161
perror("klogctl");
1162
}
1163
}
1164
#endif /* __linux__ */
1165
}
1166
1167
if(quit_now){
1168
goto end;
1169
}
1170
1171
uid = getuid();
1172
gid = getgid();
1173
1174
errno = 0;
1175
setgid(gid);
1176
if(ret == -1){
1177
perror("setgid");
1178
}
1179
1180
ret = setuid(uid);
1181
if(ret == -1){
1182
perror("setuid");
1183
}
1184
1185
if(quit_now){
1186
goto end;
1187
}
1188
1189
ret = init_gnutls_global(pubkey, seckey);
1190
if(ret == -1){
1191
fprintf(stderr, "init_gnutls_global failed\n");
1192
exitcode = EXIT_FAILURE;
1193
goto end;
1194
} else {
1195
gnutls_initialized = true;
1196
}
1197
1198
if(quit_now){
1199
goto end;
1200
}
1201
1202
tempdir_created = true;
1203
if(mkdtemp(tempdir) == NULL){
1204
tempdir_created = false;
1205
perror("mkdtemp");
1206
goto end;
1207
}
1208
1209
if(quit_now){
1210
goto end;
1211
}
1212
1213
if(not init_gpgme(pubkey, seckey, tempdir)){
1214
fprintf(stderr, "init_gpgme failed\n");
1215
exitcode = EXIT_FAILURE;
1216
goto end;
1217
} else {
1218
gpgme_initialized = true;
1219
}
1220
1221
if(quit_now){
1222
goto end;
1223
}
1224
1225
if(connect_to != NULL){
1226
/* Connect directly, do not use Zeroconf */
1227
/* (Mainly meant for debugging) */
1228
char *address = strrchr(connect_to, ':');
1229
if(address == NULL){
1230
fprintf(stderr, "No colon in address\n");
1231
exitcode = EXIT_FAILURE;
1232
goto end;
1233
}
1234
1235
if(quit_now){
1236
goto end;
1237
}
1238
1239
uint16_t port;
1240
errno = 0;
1241
tmpmax = strtoimax(address+1, &tmp, 10);
1242
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1243
or tmpmax != (uint16_t)tmpmax){
1244
fprintf(stderr, "Bad port number\n");
1245
exitcode = EXIT_FAILURE;
1246
goto end;
1247
}
1248
1249
if(quit_now){
1250
goto end;
1251
}
1252
1253
port = (uint16_t)tmpmax;
1254
*address = '\0';
1255
address = connect_to;
1256
/* Colon in address indicates IPv6 */
1257
int af;
1258
if(strchr(address, ':') != NULL){
1259
af = AF_INET6;
1260
} else {
1261
af = AF_INET;
1262
}
1263
1264
if(quit_now){
1265
goto end;
1266
}
1267
1268
ret = start_mandos_communication(address, port, if_index, af);
1269
if(ret < 0){
1270
exitcode = EXIT_FAILURE;
1271
} else {
1272
exitcode = EXIT_SUCCESS;
1273
}
1274
goto end;
1275
}
1276
1277
if(quit_now){
1278
goto end;
1279
}
1280
1281
{
1282
AvahiServerConfig config;
1283
/* Do not publish any local Zeroconf records */
1284
avahi_server_config_init(&config);
1285
config.publish_hinfo = 0;
1286
config.publish_addresses = 0;
1287
config.publish_workstation = 0;
1288
config.publish_domain = 0;
1289
1290
/* Allocate a new server */
1291
mc.server = avahi_server_new(avahi_simple_poll_get
1292
(mc.simple_poll), &config, NULL,
1293
NULL, &error);
1294
1295
/* Free the Avahi configuration data */
1296
avahi_server_config_free(&config);
1297
}
1298
1299
/* Check if creating the Avahi server object succeeded */
1300
if(mc.server == NULL){
1301
fprintf(stderr, "Failed to create Avahi server: %s\n",
1302
avahi_strerror(error));
1303
exitcode = EXIT_FAILURE;
1304
goto end;
1305
}
1306
1307
if(quit_now){
1308
goto end;
1309
}
1310
1311
/* Create the Avahi service browser */
1312
sb = avahi_s_service_browser_new(mc.server, if_index,
1313
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1314
NULL, 0, browse_callback, NULL);
1315
if(sb == NULL){
1316
fprintf(stderr, "Failed to create service browser: %s\n",
1317
avahi_strerror(avahi_server_errno(mc.server)));
1318
exitcode = EXIT_FAILURE;
1319
goto end;
1320
}
1321
1322
if(quit_now){
1323
goto end;
1324
}
1325
1326
/* Run the main loop */
1327
1328
if(debug){
1329
fprintf(stderr, "Starting Avahi loop search\n");
1330
}
1331
1332
avahi_simple_poll_loop(mc.simple_poll);
1333
925
1334
end:
926
927
if (debug){
928
fprintf(stderr, "%s exiting\n", argv[0]);
929
}
930
931
/* Cleanup things */
932
if (sb != NULL)
933
avahi_s_service_browser_free(sb);
934
935
if (mc.server != NULL)
936
avahi_server_free(mc.server);
937
938
if (mc.simple_poll != NULL)
939
avahi_simple_poll_free(mc.simple_poll);
940
free(pubkeyfile);
941
free(seckeyfile);
942
943
return exitcode;
1335
1336
if(debug){
1337
fprintf(stderr, "%s exiting\n", argv[0]);
1338
}
1339
1340
/* Cleanup things */
1341
if(sb != NULL)
1342
avahi_s_service_browser_free(sb);
1343
1344
if(mc.server != NULL)
1345
avahi_server_free(mc.server);
1346
1347
if(mc.simple_poll != NULL)
1348
avahi_simple_poll_free(mc.simple_poll);
1349
1350
if(gnutls_initialized){
1351
gnutls_certificate_free_credentials(mc.cred);
1352
gnutls_global_deinit();
1353
gnutls_dh_params_deinit(mc.dh_params);
1354
}
1355
1356
if(gpgme_initialized){
1357
gpgme_release(mc.ctx);
1358
}
1359
1360
/* Take down the network interface */
1361
if(take_down_interface){
1362
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1363
if(ret == -1){
1364
perror("ioctl SIOCGIFFLAGS");
1365
} else if(network.ifr_flags & IFF_UP) {
1366
network.ifr_flags &= ~IFF_UP; /* clear flag */
1367
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1368
if(ret == -1){
1369
perror("ioctl SIOCSIFFLAGS");
1370
}
1371
}
1372
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1373
if(ret == -1){
1374
perror("close");
1375
}
1376
}
1377
1378
/* Removes the temp directory used by GPGME */
1379
if(tempdir_created){
1380
DIR *d;
1381
struct dirent *direntry;
1382
d = opendir(tempdir);
1383
if(d == NULL){
1384
if(errno != ENOENT){
1385
perror("opendir");
1386
}
1387
} else {
1388
while(true){
1389
direntry = readdir(d);
1390
if(direntry == NULL){
1391
break;
1392
}
1393
/* Skip "." and ".." */
1394
if(direntry->d_name[0] == '.'
1395
and (direntry->d_name[1] == '\0'
1396
or (direntry->d_name[1] == '.'
1397
and direntry->d_name[2] == '\0'))){
1398
continue;
1399
}
1400
char *fullname = NULL;
1401
ret = asprintf(&fullname, "%s/%s", tempdir,
1402
direntry->d_name);
1403
if(ret < 0){
1404
perror("asprintf");
1405
continue;
1406
}
1407
ret = remove(fullname);
1408
if(ret == -1){
1409
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1410
strerror(errno));
1411
}
1412
free(fullname);
1413
}
1414
closedir(d);
1415
}
1416
ret = rmdir(tempdir);
1417
if(ret == -1 and errno != ENOENT){
1418
perror("rmdir");
1419
}
1420
}
1421
1422
return exitcode;
944
1423
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0