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237.2.105
(compared to revision 24.1.13)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-04-17 08:26:17 UTC
- mto: (24.1.138 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-20090417082617-eltetak5lzjyz55o
* initramfs-tools-hook: Bug fix: Add "--userid" and "--groupid" to
start of "plugin-runner.conf" file instead of
appending, to allow any preexisting options to
override.
* plugin-runner.conf: Improved wording.
start of "plugin-runner.conf" file instead of
appending, to allow any preexisting options to
override.
* plugin-runner.conf: Improved wording.
- 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;
91
134
unsigned int dh_bits;
92
135
gnutls_dh_params_t dh_params;
93
136
const char *priority;
137
gpgme_ctx_t ctx;
94
138
} mandos_context;
95
139
96
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,
97
151
size_t buffer_capacity){
98
if (buffer_length + BUFFER_SIZE > buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
99
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
100
if (buffer == NULL){
154
if(buffer == NULL){
101
155
return 0;
102
156
}
103
157
buffer_capacity += BUFFER_SIZE;
106
160
}
107
161
108
162
/*
109
* Decrypt OpenPGP data using keyrings in HOMEDIR.
110
* Returns -1 on error
163
* Initialize GPGME.
111
164
*/
112
static ssize_t pgp_packet_decrypt (const char *cryptotext,
113
size_t crypto_size,
114
char **plaintext,
115
const char *homedir){
116
gpgme_data_t dh_crypto, dh_plain;
117
gpgme_ctx_t ctx;
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
118
168
gpgme_error_t rc;
119
ssize_t ret;
120
size_t plaintext_capacity = 0;
121
ssize_t plaintext_length = 0;
122
169
gpgme_engine_info_t engine_info;
123
170
124
if (debug){
125
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");
126
209
}
127
210
128
211
/* Init GPGME */
129
212
gpgme_check_version(NULL);
130
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
131
if (rc != GPG_ERR_NO_ERROR){
214
if(rc != GPG_ERR_NO_ERROR){
132
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
133
216
gpgme_strsource(rc), gpgme_strerror(rc));
134
return -1;
217
return false;
135
218
}
136
219
137
/* Set GPGME home directory for the OpenPGP engine only */
138
rc = gpgme_get_engine_info (&engine_info);
139
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){
140
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
141
224
gpgme_strsource(rc), gpgme_strerror(rc));
142
return -1;
225
return false;
143
226
}
144
227
while(engine_info != NULL){
145
228
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
146
229
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
147
engine_info->file_name, homedir);
230
engine_info->file_name, tempdir);
148
231
break;
149
232
}
150
233
engine_info = engine_info->next;
151
234
}
152
235
if(engine_info == NULL){
153
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
154
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");
155
270
}
156
271
157
272
/* Create new GPGME data buffer from memory cryptotext */
158
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
159
274
0);
160
if (rc != GPG_ERR_NO_ERROR){
275
if(rc != GPG_ERR_NO_ERROR){
161
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
162
277
gpgme_strsource(rc), gpgme_strerror(rc));
163
278
return -1;
165
280
166
281
/* Create new empty GPGME data buffer for the plaintext */
167
282
rc = gpgme_data_new(&dh_plain);
168
if (rc != GPG_ERR_NO_ERROR){
283
if(rc != GPG_ERR_NO_ERROR){
169
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
170
285
gpgme_strsource(rc), gpgme_strerror(rc));
171
286
gpgme_data_release(dh_crypto);
172
287
return -1;
173
288
}
174
289
175
/* Create new GPGME "context" */
176
rc = gpgme_new(&ctx);
177
if (rc != GPG_ERR_NO_ERROR){
178
fprintf(stderr, "bad gpgme_new: %s: %s\n",
179
gpgme_strsource(rc), gpgme_strerror(rc));
180
plaintext_length = -1;
181
goto decrypt_end;
182
}
183
184
290
/* Decrypt data from the cryptotext data buffer to the plaintext
185
291
data buffer */
186
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
187
if (rc != GPG_ERR_NO_ERROR){
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
188
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
189
295
gpgme_strsource(rc), gpgme_strerror(rc));
190
296
plaintext_length = -1;
297
if(debug){
298
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
300
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
302
} else {
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
307
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
309
}
310
gpgme_recipient_t recipient;
311
recipient = result->recipients;
312
if(recipient){
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
319
? "No" : "Yes");
320
recipient = recipient->next;
321
}
322
}
323
}
324
}
191
325
goto decrypt_end;
192
326
}
193
327
195
329
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
196
330
}
197
331
198
if (debug){
199
gpgme_decrypt_result_t result;
200
result = gpgme_op_decrypt_result(ctx);
201
if (result == NULL){
202
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
203
} else {
204
fprintf(stderr, "Unsupported algorithm: %s\n",
205
result->unsupported_algorithm);
206
fprintf(stderr, "Wrong key usage: %d\n",
207
result->wrong_key_usage);
208
if(result->file_name != NULL){
209
fprintf(stderr, "File name: %s\n", result->file_name);
210
}
211
gpgme_recipient_t recipient;
212
recipient = result->recipients;
213
if(recipient){
214
while(recipient != NULL){
215
fprintf(stderr, "Public key algorithm: %s\n",
216
gpgme_pubkey_algo_name(recipient->pubkey_algo));
217
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
218
fprintf(stderr, "Secret key available: %s\n",
219
recipient->status == GPG_ERR_NO_SECKEY
220
? "No" : "Yes");
221
recipient = recipient->next;
222
}
223
}
224
}
225
}
226
227
332
/* Seek back to the beginning of the GPGME plaintext data buffer */
228
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
229
perror("pgpme_data_seek");
333
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
334
perror("gpgme_data_seek");
230
335
plaintext_length = -1;
231
336
goto decrypt_end;
232
337
}
233
338
234
339
*plaintext = NULL;
235
340
while(true){
236
plaintext_capacity = adjustbuffer(plaintext, (size_t)plaintext_length,
341
plaintext_capacity = incbuffer(plaintext,
342
(size_t)plaintext_length,
237
343
plaintext_capacity);
238
if (plaintext_capacity == 0){
239
perror("adjustbuffer");
344
if(plaintext_capacity == 0){
345
perror("incbuffer");
240
346
plaintext_length = -1;
241
347
goto decrypt_end;
242
348
}
244
350
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
245
351
BUFFER_SIZE);
246
352
/* Print the data, if any */
247
if (ret == 0){
353
if(ret == 0){
248
354
/* EOF */
249
355
break;
250
356
}
255
361
}
256
362
plaintext_length += ret;
257
363
}
258
364
259
365
if(debug){
260
366
fprintf(stderr, "Decrypted password is: ");
261
367
for(ssize_t i = 0; i < plaintext_length; i++){
274
380
return plaintext_length;
275
381
}
276
382
277
static const char * safer_gnutls_strerror (int value) {
278
const char *ret = gnutls_strerror (value);
279
if (ret == NULL)
383
static const char * safer_gnutls_strerror(int value){
384
const char *ret = gnutls_strerror(value); /* Spurious warning from
385
-Wunreachable-code */
386
if(ret == NULL)
280
387
ret = "(unknown)";
281
388
return ret;
282
389
}
287
394
fprintf(stderr, "GnuTLS: %s", string);
288
395
}
289
396
290
static int init_gnutls_global(mandos_context *mc){
397
static int init_gnutls_global(const char *pubkeyfilename,
398
const char *seckeyfilename){
291
399
int ret;
292
400
293
401
if(debug){
294
402
fprintf(stderr, "Initializing GnuTLS\n");
295
403
}
296
297
if ((ret = gnutls_global_init ())
298
!= GNUTLS_E_SUCCESS) {
299
fprintf (stderr, "GnuTLS global_init: %s\n",
300
safer_gnutls_strerror(ret));
404
405
ret = gnutls_global_init();
406
if(ret != GNUTLS_E_SUCCESS){
407
fprintf(stderr, "GnuTLS global_init: %s\n",
408
safer_gnutls_strerror(ret));
301
409
return -1;
302
410
}
303
411
304
if (debug){
412
if(debug){
305
413
/* "Use a log level over 10 to enable all debugging options."
306
414
* - GnuTLS manual
307
415
*/
310
418
}
311
419
312
420
/* 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));
421
gnutls_certificate_allocate_credentials(&mc.cred);
422
if(ret != GNUTLS_E_SUCCESS){
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
427
safer_gnutls_strerror(ret));
428
gnutls_global_deinit();
317
429
return -1;
318
430
}
319
431
320
432
if(debug){
321
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
322
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
323
seckeyfile);
433
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
434
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
435
seckeyfilename);
324
436
}
325
437
326
438
ret = gnutls_certificate_set_openpgp_key_file
327
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
328
if (ret != GNUTLS_E_SUCCESS) {
439
(mc.cred, pubkeyfilename, seckeyfilename,
440
GNUTLS_OPENPGP_FMT_BASE64);
441
if(ret != GNUTLS_E_SUCCESS){
329
442
fprintf(stderr,
330
443
"Error[%d] while reading the OpenPGP key pair ('%s',"
331
" '%s')\n", ret, pubkeyfile, seckeyfile);
332
fprintf(stdout, "The GnuTLS error is: %s\n",
444
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
445
fprintf(stderr, "The GnuTLS error is: %s\n",
333
446
safer_gnutls_strerror(ret));
334
return -1;
447
goto globalfail;
335
448
}
336
449
337
450
/* GnuTLS server initialization */
338
ret = gnutls_dh_params_init(&mc->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(mc->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, mc->dh_params);
352
451
ret = gnutls_dh_params_init(&mc.dh_params);
452
if(ret != GNUTLS_E_SUCCESS){
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
454
" %s\n", safer_gnutls_strerror(ret));
455
goto globalfail;
456
}
457
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
458
if(ret != GNUTLS_E_SUCCESS){
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
460
safer_gnutls_strerror(ret));
461
goto globalfail;
462
}
463
464
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
465
353
466
return 0;
467
468
globalfail:
469
470
gnutls_certificate_free_credentials(mc.cred);
471
gnutls_global_deinit();
472
gnutls_dh_params_deinit(mc.dh_params);
473
return -1;
354
474
}
355
475
356
static int init_gnutls_session(mandos_context *mc, gnutls_session_t *session){
476
static int init_gnutls_session(gnutls_session_t *session){
357
477
int ret;
358
478
/* GnuTLS session creation */
359
479
ret = gnutls_init(session, GNUTLS_SERVER);
360
if (ret != GNUTLS_E_SUCCESS){
480
if(ret != GNUTLS_E_SUCCESS){
361
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
362
482
safer_gnutls_strerror(ret));
363
483
}
364
484
365
485
{
366
486
const char *err;
367
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
368
if (ret != GNUTLS_E_SUCCESS) {
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
488
if(ret != GNUTLS_E_SUCCESS){
369
489
fprintf(stderr, "Syntax error at: %s\n", err);
370
490
fprintf(stderr, "GnuTLS error: %s\n",
371
491
safer_gnutls_strerror(ret));
492
gnutls_deinit(*session);
372
493
return -1;
373
494
}
374
495
}
375
496
376
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
377
mc->cred);
378
if (ret != GNUTLS_E_SUCCESS) {
498
mc.cred);
499
if(ret != GNUTLS_E_SUCCESS){
379
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
380
501
safer_gnutls_strerror(ret));
502
gnutls_deinit(*session);
381
503
return -1;
382
504
}
383
505
384
506
/* ignore client certificate if any. */
385
gnutls_certificate_server_set_request (*session,
386
GNUTLS_CERT_IGNORE);
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
387
509
388
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
389
511
390
512
return 0;
391
513
}
397
519
/* Called when a Mandos server is found */
398
520
static int start_mandos_communication(const char *ip, uint16_t port,
399
521
AvahiIfIndex if_index,
400
mandos_context *mc){
522
int af){
401
523
int ret, tcp_sd;
402
struct sockaddr_in6 to;
524
ssize_t sret;
525
union {
526
struct sockaddr_in in;
527
struct sockaddr_in6 in6;
528
} to;
403
529
char *buffer = NULL;
404
530
char *decrypted_buffer;
405
531
size_t buffer_length = 0;
407
533
ssize_t decrypted_buffer_size;
408
534
size_t written;
409
535
int retval = 0;
410
char interface[IF_NAMESIZE];
411
536
gnutls_session_t session;
412
gnutls_dh_params_t dh_params;
413
414
ret = init_gnutls_session (mc, &session);
415
if (ret != 0){
537
int pf; /* Protocol family */
538
539
switch(af){
540
case AF_INET6:
541
pf = PF_INET6;
542
break;
543
case AF_INET:
544
pf = PF_INET;
545
break;
546
default:
547
fprintf(stderr, "Bad address family: %d\n", af);
548
return -1;
549
}
550
551
ret = init_gnutls_session(&session);
552
if(ret != 0){
416
553
return -1;
417
554
}
418
555
419
556
if(debug){
420
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
421
ip, port);
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
558
"\n", ip, port);
422
559
}
423
560
424
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
425
if(tcp_sd < 0) {
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
562
if(tcp_sd < 0){
426
563
perror("socket");
427
564
return -1;
428
565
}
429
430
if(debug){
431
if(if_indextoname((unsigned int)if_index, interface) == NULL){
432
perror("if_indextoname");
433
return -1;
434
}
435
fprintf(stderr, "Binding to interface %s\n", interface);
436
}
437
566
438
memset(&to,0,sizeof(to)); /* Spurious warning */
439
to.sin6_family = AF_INET6;
440
/* It would be nice to have a way to detect if we were passed an
441
IPv4 address here. Now we assume an IPv6 address. */
442
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
443
if (ret < 0 ){
567
memset(&to, 0, sizeof(to));
568
if(af == AF_INET6){
569
to.in6.sin6_family = (sa_family_t)af;
570
ret = inet_pton(af, ip, &to.in6.sin6_addr);
571
} else { /* IPv4 */
572
to.in.sin_family = (sa_family_t)af;
573
ret = inet_pton(af, ip, &to.in.sin_addr);
574
}
575
if(ret < 0 ){
444
576
perror("inet_pton");
445
577
return -1;
446
578
}
448
580
fprintf(stderr, "Bad address: %s\n", ip);
449
581
return -1;
450
582
}
451
to.sin6_port = htons(port); /* Spurious warning */
452
453
to.sin6_scope_id = (uint32_t)if_index;
583
if(af == AF_INET6){
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
585
-Wconversion and
586
-Wunreachable-code */
587
588
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
589
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
590
-Wunreachable-code*/
591
if(if_index == AVAHI_IF_UNSPEC){
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
593
" without a network interface\n");
594
return -1;
595
}
596
/* Set the network interface number as scope */
597
to.in6.sin6_scope_id = (uint32_t)if_index;
598
}
599
} else {
600
to.in.sin_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
603
}
454
604
455
605
if(debug){
456
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
457
char addrstr[INET6_ADDRSTRLEN] = "";
458
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
459
sizeof(addrstr)) == NULL){
606
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
607
char interface[IF_NAMESIZE];
608
if(if_indextoname((unsigned int)if_index, interface) == NULL){
609
perror("if_indextoname");
610
} else {
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
612
ip, interface, port);
613
}
614
} else {
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
616
port);
617
}
618
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
619
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
620
const char *pcret;
621
if(af == AF_INET6){
622
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
623
sizeof(addrstr));
624
} else {
625
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
626
sizeof(addrstr));
627
}
628
if(pcret == NULL){
460
629
perror("inet_ntop");
461
630
} else {
462
631
if(strcmp(addrstr, ip) != 0){
465
634
}
466
635
}
467
636
468
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
469
if (ret < 0){
637
if(af == AF_INET6){
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
639
} else {
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
641
}
642
if(ret < 0){
470
643
perror("connect");
471
644
return -1;
472
645
}
473
646
474
647
const char *out = mandos_protocol_version;
475
648
written = 0;
476
while (true){
649
while(true){
477
650
size_t out_size = strlen(out);
478
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
651
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
479
652
out_size - written));
480
if (ret == -1){
653
if(ret == -1){
481
654
perror("write");
482
655
retval = -1;
483
656
goto mandos_end;
486
659
if(written < out_size){
487
660
continue;
488
661
} else {
489
if (out == mandos_protocol_version){
662
if(out == mandos_protocol_version){
490
663
written = 0;
491
664
out = "\r\n";
492
665
} else {
494
667
}
495
668
}
496
669
}
497
670
498
671
if(debug){
499
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
500
673
}
501
674
502
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
503
504
ret = gnutls_handshake (session);
505
506
if (ret != GNUTLS_E_SUCCESS){
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
676
677
do{
678
ret = gnutls_handshake(session);
679
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
680
681
if(ret != GNUTLS_E_SUCCESS){
507
682
if(debug){
508
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
509
gnutls_perror (ret);
684
gnutls_perror(ret);
510
685
}
511
686
retval = -1;
512
687
goto mandos_end;
515
690
/* Read OpenPGP packet that contains the wanted password */
516
691
517
692
if(debug){
518
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
693
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
519
694
ip);
520
695
}
521
696
522
697
while(true){
523
buffer_capacity = adjustbuffer(&buffer, buffer_length, buffer_capacity);
524
if (buffer_capacity == 0){
525
perror("adjustbuffer");
698
buffer_capacity = incbuffer(&buffer, buffer_length,
699
buffer_capacity);
700
if(buffer_capacity == 0){
701
perror("incbuffer");
526
702
retval = -1;
527
703
goto mandos_end;
528
704
}
529
705
530
ret = gnutls_record_recv(session, buffer+buffer_length,
531
BUFFER_SIZE);
532
if (ret == 0){
706
sret = gnutls_record_recv(session, buffer+buffer_length,
707
BUFFER_SIZE);
708
if(sret == 0){
533
709
break;
534
710
}
535
if (ret < 0){
536
switch(ret){
711
if(sret < 0){
712
switch(sret){
537
713
case GNUTLS_E_INTERRUPTED:
538
714
case GNUTLS_E_AGAIN:
539
715
break;
540
716
case GNUTLS_E_REHANDSHAKE:
541
ret = gnutls_handshake (session);
542
if (ret < 0){
717
do{
718
ret = gnutls_handshake(session);
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
720
if(ret < 0){
543
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
544
gnutls_perror (ret);
722
gnutls_perror(ret);
545
723
retval = -1;
546
724
goto mandos_end;
547
725
}
550
728
fprintf(stderr, "Unknown error while reading data from"
551
729
" encrypted session with Mandos server\n");
552
730
retval = -1;
553
gnutls_bye (session, GNUTLS_SHUT_RDWR);
731
gnutls_bye(session, GNUTLS_SHUT_RDWR);
554
732
goto mandos_end;
555
733
}
556
734
} else {
557
buffer_length += (size_t) ret;
735
buffer_length += (size_t) sret;
558
736
}
559
737
}
560
738
562
740
fprintf(stderr, "Closing TLS session\n");
563
741
}
564
742
565
gnutls_bye (session, GNUTLS_SHUT_RDWR);
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
566
744
567
if (buffer_length > 0){
745
if(buffer_length > 0){
568
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
569
747
buffer_length,
570
&decrypted_buffer,
571
keydir);
572
if (decrypted_buffer_size >= 0){
748
&decrypted_buffer);
749
if(decrypted_buffer_size >= 0){
573
750
written = 0;
574
751
while(written < (size_t) decrypted_buffer_size){
575
ret = (int)fwrite (decrypted_buffer + written, 1,
576
(size_t)decrypted_buffer_size - written,
577
stdout);
752
ret = (int)fwrite(decrypted_buffer + written, 1,
753
(size_t)decrypted_buffer_size - written,
754
stdout);
578
755
if(ret == 0 and ferror(stdout)){
579
756
if(debug){
580
757
fprintf(stderr, "Error writing encrypted data: %s\n",
589
766
} else {
590
767
retval = -1;
591
768
}
769
} else {
770
retval = -1;
592
771
}
593
772
594
773
/* Shutdown procedure */
595
774
596
775
mandos_end:
597
776
free(buffer);
598
close(tcp_sd);
599
gnutls_deinit (session);
600
gnutls_certificate_free_credentials (mc->cred);
601
gnutls_global_deinit ();
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
780
}
781
gnutls_deinit(session);
602
782
return retval;
603
783
}
604
784
605
785
static void resolve_callback(AvahiSServiceResolver *r,
606
786
AvahiIfIndex interface,
607
AVAHI_GCC_UNUSED AvahiProtocol protocol,
787
AvahiProtocol proto,
608
788
AvahiResolverEvent event,
609
789
const char *name,
610
790
const char *type,
615
795
AVAHI_GCC_UNUSED AvahiStringList *txt,
616
796
AVAHI_GCC_UNUSED AvahiLookupResultFlags
617
797
flags,
618
void* userdata) {
619
mandos_context *mc = userdata;
620
assert(r); /* Spurious warning */
798
AVAHI_GCC_UNUSED void* userdata){
799
assert(r);
621
800
622
801
/* Called whenever a service has been resolved successfully or
623
802
timed out */
624
803
625
switch (event) {
804
switch(event){
626
805
default:
627
806
case AVAHI_RESOLVER_FAILURE:
628
807
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
629
808
" of type '%s' in domain '%s': %s\n", name, type, domain,
630
avahi_strerror(avahi_server_errno(mc->server)));
809
avahi_strerror(avahi_server_errno(mc.server)));
631
810
break;
632
811
633
812
case AVAHI_RESOLVER_FOUND:
635
814
char ip[AVAHI_ADDRESS_STR_MAX];
636
815
avahi_address_snprint(ip, sizeof(ip), address);
637
816
if(debug){
638
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
639
" port %d\n", name, host_name, ip, interface, port);
817
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
818
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
819
ip, (intmax_t)interface, port);
640
820
}
641
int ret = start_mandos_communication(ip, port, interface, mc);
642
if (ret == 0){
643
exit(EXIT_SUCCESS);
821
int ret = start_mandos_communication(ip, port, interface,
822
avahi_proto_to_af(proto));
823
if(ret == 0){
824
avahi_simple_poll_quit(mc.simple_poll);
644
825
}
645
826
}
646
827
}
647
828
avahi_s_service_resolver_free(r);
648
829
}
649
830
650
static void browse_callback( AvahiSServiceBrowser *b,
651
AvahiIfIndex interface,
652
AvahiProtocol protocol,
653
AvahiBrowserEvent event,
654
const char *name,
655
const char *type,
656
const char *domain,
657
AVAHI_GCC_UNUSED AvahiLookupResultFlags
658
flags,
659
void* userdata) {
660
mandos_context *mc = userdata;
661
assert(b); /* Spurious warning */
831
static void browse_callback(AvahiSServiceBrowser *b,
832
AvahiIfIndex interface,
833
AvahiProtocol protocol,
834
AvahiBrowserEvent event,
835
const char *name,
836
const char *type,
837
const char *domain,
838
AVAHI_GCC_UNUSED AvahiLookupResultFlags
839
flags,
840
AVAHI_GCC_UNUSED void* userdata){
841
assert(b);
662
842
663
843
/* Called whenever a new services becomes available on the LAN or
664
844
is removed from the LAN */
665
845
666
switch (event) {
846
switch(event){
667
847
default:
668
848
case AVAHI_BROWSER_FAILURE:
669
849
670
850
fprintf(stderr, "(Avahi browser) %s\n",
671
avahi_strerror(avahi_server_errno(mc->server)));
672
avahi_simple_poll_quit(mc->simple_poll);
851
avahi_strerror(avahi_server_errno(mc.server)));
852
avahi_simple_poll_quit(mc.simple_poll);
673
853
return;
674
854
675
855
case AVAHI_BROWSER_NEW:
678
858
the callback function is called the Avahi server will free the
679
859
resolver for us. */
680
860
681
if (!(avahi_s_service_resolver_new(mc->server, interface,
682
protocol, name, type, domain,
683
AVAHI_PROTO_INET6, 0,
684
resolve_callback, mc)))
861
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
862
name, type, domain, protocol, 0,
863
resolve_callback, NULL) == NULL)
685
864
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
686
name, avahi_strerror(avahi_server_errno(mc->server)));
865
name, avahi_strerror(avahi_server_errno(mc.server)));
687
866
break;
688
867
689
868
case AVAHI_BROWSER_REMOVE:
698
877
}
699
878
}
700
879
701
/* Combines file name and path and returns the malloced new
702
string. some sane checks could/should be added */
703
static const char *combinepath(const char *first, const char *second){
704
size_t f_len = strlen(first);
705
size_t s_len = strlen(second);
706
char *tmp = malloc(f_len + s_len + 2);
707
if (tmp == NULL){
708
return NULL;
709
}
710
if(f_len > 0){
711
memcpy(tmp, first, f_len); /* Spurious warning */
712
}
713
tmp[f_len] = '/';
714
if(s_len > 0){
715
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
716
}
717
tmp[f_len + 1 + s_len] = '\0';
718
return tmp;
880
sig_atomic_t quit_now = 0;
881
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
884
if(quit_now){
885
return;
886
}
887
quit_now = 1;
888
int old_errno = errno;
889
if(mc.simple_poll != NULL){
890
avahi_simple_poll_quit(mc.simple_poll);
891
}
892
errno = old_errno;
719
893
}
720
894
721
722
895
int main(int argc, char *argv[]){
723
AvahiSServiceBrowser *sb = NULL;
724
int error;
725
int ret;
726
int exitcode = EXIT_SUCCESS;
727
const char *interface = "eth0";
728
struct ifreq network;
729
int sd;
730
uid_t uid;
731
gid_t gid;
732
char *connect_to = NULL;
733
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
734
mandos_context mc = { .simple_poll = NULL, .server = NULL,
735
.dh_bits = 1024, .priority = "SECURE256"};
736
737
{
738
/* Temporary int to get the address of for getopt_long */
739
int debug_int = debug ? 1 : 0;
740
while (true){
741
struct option long_options[] = {
742
{"debug", no_argument, &debug_int, 1},
743
{"connect", required_argument, NULL, 'c'},
744
{"interface", required_argument, NULL, 'i'},
745
{"keydir", required_argument, NULL, 'd'},
746
{"seckey", required_argument, NULL, 's'},
747
{"pubkey", required_argument, NULL, 'p'},
748
{"dh-bits", required_argument, NULL, 'D'},
749
{"priority", required_argument, NULL, 'P'},
750
{0, 0, 0, 0} };
751
752
int option_index = 0;
753
ret = getopt_long (argc, argv, "i:", long_options,
754
&option_index);
755
756
if (ret == -1){
757
break;
758
}
759
760
switch(ret){
761
case 0:
762
break;
763
case 'i':
764
interface = optarg;
765
break;
766
case 'c':
767
connect_to = optarg;
768
break;
769
case 'd':
770
keydir = optarg;
771
break;
772
case 'p':
773
pubkeyfile = optarg;
774
break;
775
case 's':
776
seckeyfile = optarg;
777
break;
778
case 'D':
779
errno = 0;
780
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
781
if (errno){
782
perror("strtol");
783
exit(EXIT_FAILURE);
896
AvahiSServiceBrowser *sb = NULL;
897
int error;
898
int ret;
899
intmax_t tmpmax;
900
char *tmp;
901
int exitcode = EXIT_SUCCESS;
902
const char *interface = "eth0";
903
struct ifreq network;
904
int sd;
905
uid_t uid;
906
gid_t gid;
907
char *connect_to = NULL;
908
char tempdir[] = "/tmp/mandosXXXXXX";
909
bool tempdir_created = false;
910
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
911
const char *seckey = PATHDIR "/" SECKEY;
912
const char *pubkey = PATHDIR "/" PUBKEY;
913
914
bool gnutls_initialized = false;
915
bool gpgme_initialized = false;
916
float delay = 2.5f;
917
918
struct sigaction old_sigterm_action;
919
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
920
921
{
922
struct argp_option options[] = {
923
{ .name = "debug", .key = 128,
924
.doc = "Debug mode", .group = 3 },
925
{ .name = "connect", .key = 'c',
926
.arg = "ADDRESS:PORT",
927
.doc = "Connect directly to a specific Mandos server",
928
.group = 1 },
929
{ .name = "interface", .key = 'i',
930
.arg = "NAME",
931
.doc = "Network interface that will be used to search for"
932
" Mandos servers",
933
.group = 1 },
934
{ .name = "seckey", .key = 's',
935
.arg = "FILE",
936
.doc = "OpenPGP secret key file base name",
937
.group = 1 },
938
{ .name = "pubkey", .key = 'p',
939
.arg = "FILE",
940
.doc = "OpenPGP public key file base name",
941
.group = 2 },
942
{ .name = "dh-bits", .key = 129,
943
.arg = "BITS",
944
.doc = "Bit length of the prime number used in the"
945
" Diffie-Hellman key exchange",
946
.group = 2 },
947
{ .name = "priority", .key = 130,
948
.arg = "STRING",
949
.doc = "GnuTLS priority string for the TLS handshake",
950
.group = 1 },
951
{ .name = "delay", .key = 131,
952
.arg = "SECONDS",
953
.doc = "Maximum delay to wait for interface startup",
954
.group = 2 },
955
{ .name = NULL }
956
};
957
958
error_t parse_opt(int key, char *arg,
959
struct argp_state *state){
960
switch(key){
961
case 128: /* --debug */
962
debug = true;
963
break;
964
case 'c': /* --connect */
965
connect_to = arg;
966
break;
967
case 'i': /* --interface */
968
interface = arg;
969
break;
970
case 's': /* --seckey */
971
seckey = arg;
972
break;
973
case 'p': /* --pubkey */
974
pubkey = arg;
975
break;
976
case 129: /* --dh-bits */
977
errno = 0;
978
tmpmax = strtoimax(arg, &tmp, 10);
979
if(errno != 0 or tmp == arg or *tmp != '\0'
980
or tmpmax != (typeof(mc.dh_bits))tmpmax){
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
983
}
984
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
985
break;
986
case 130: /* --priority */
987
mc.priority = arg;
988
break;
989
case 131: /* --delay */
990
errno = 0;
991
delay = strtof(arg, &tmp);
992
if(errno != 0 or tmp == arg or *tmp != '\0'){
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
995
}
996
break;
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
1000
break;
1001
default:
1002
return ARGP_ERR_UNKNOWN;
1003
}
1004
return 0;
1005
}
1006
1007
struct argp argp = { .options = options, .parser = parse_opt,
1008
.args_doc = "",
1009
.doc = "Mandos client -- Get and decrypt"
1010
" passwords from a Mandos server" };
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1015
goto end;
1016
}
1017
}
1018
1019
if(not debug){
1020
avahi_set_log_function(empty_log);
1021
}
1022
1023
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1024
from the signal handler */
1025
/* Initialize the pseudo-RNG for Avahi */
1026
srand((unsigned int) time(NULL));
1027
mc.simple_poll = avahi_simple_poll_new();
1028
if(mc.simple_poll == NULL){
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
1031
goto end;
1032
}
1033
1034
sigemptyset(&sigterm_action.sa_mask);
1035
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1036
if(ret == -1){
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
1039
goto end;
1040
}
1041
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1042
if(ret == -1){
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
1045
goto end;
1046
}
1047
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1048
if(ret == -1){
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1051
goto end;
1052
}
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
if(ret == -1){
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1059
1060
/* If the interface is down, bring it up */
1061
if(interface[0] != '\0'){
1062
#ifdef __linux__
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1064
messages to mess up the prompt */
1065
ret = klogctl(8, NULL, 5);
1066
bool restore_loglevel = true;
1067
if(ret == -1){
1068
restore_loglevel = false;
1069
perror("klogctl");
1070
}
1071
#endif /* __linux__ */
1072
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1074
if(sd < 0){
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1077
#ifdef __linux__
1078
if(restore_loglevel){
1079
ret = klogctl(7, NULL, 0);
1080
if(ret == -1){
1081
perror("klogctl");
1082
}
1083
}
1084
#endif /* __linux__ */
1085
goto end;
1086
}
1087
strcpy(network.ifr_name, interface);
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1089
if(ret == -1){
1090
perror("ioctl SIOCGIFFLAGS");
1091
#ifdef __linux__
1092
if(restore_loglevel){
1093
ret = klogctl(7, NULL, 0);
1094
if(ret == -1){
1095
perror("klogctl");
1096
}
1097
}
1098
#endif /* __linux__ */
1099
exitcode = EXIT_FAILURE;
1100
goto end;
1101
}
1102
if((network.ifr_flags & IFF_UP) == 0){
1103
network.ifr_flags |= IFF_UP;
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1105
if(ret == -1){
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1108
#ifdef __linux__
1109
if(restore_loglevel){
1110
ret = klogctl(7, NULL, 0);
1111
if(ret == -1){
1112
perror("klogctl");
784
1113
}
785
break;
786
case 'P':
787
mc.priority = optarg;
788
break;
789
case '?':
790
default:
791
/* getopt_long() has already printed a message about the
792
unrcognized option, so just exit. */
793
exit(EXIT_FAILURE);
794
1114
}
795
}
796
/* Set the global debug flag from the temporary int */
797
debug = debug_int ? true : false;
798
}
799
800
pubkeyfile = combinepath(keydir, pubkeyfile);
801
if (pubkeyfile == NULL){
802
perror("combinepath");
803
exitcode = EXIT_FAILURE;
804
goto end;
805
}
806
807
seckeyfile = combinepath(keydir, seckeyfile);
808
if (seckeyfile == NULL){
809
perror("combinepath");
810
goto end;
811
}
812
813
ret = init_gnutls_global(&mc);
814
if (ret == -1){
815
fprintf(stderr, "init_gnutls_global\n");
816
goto end;
817
}
818
819
uid = getuid();
820
gid = getgid();
821
822
ret = setuid(uid);
823
if (ret == -1){
824
perror("setuid");
825
}
826
827
setgid(gid);
828
if (ret == -1){
829
perror("setgid");
830
}
831
1115
#endif /* __linux__ */
1116
goto end;
1117
}
1118
}
1119
/* sleep checking until interface is running */
1120
for(int i=0; i < delay * 4; i++){
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1122
if(ret == -1){
1123
perror("ioctl SIOCGIFFLAGS");
1124
} else if(network.ifr_flags & IFF_RUNNING){
1125
break;
1126
}
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1128
ret = nanosleep(&sleeptime, NULL);
1129
if(ret == -1 and errno != EINTR){
1130
perror("nanosleep");
1131
}
1132
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1136
}
1137
#ifdef __linux__
1138
if(restore_loglevel){
1139
/* Restores kernel loglevel to default */
1140
ret = klogctl(7, NULL, 0);
1141
if(ret == -1){
1142
perror("klogctl");
1143
}
1144
}
1145
#endif /* __linux__ */
1146
}
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
errno = 0;
1152
setgid(gid);
1153
if(ret == -1){
1154
perror("setgid");
1155
}
1156
1157
ret = setuid(uid);
1158
if(ret == -1){
1159
perror("setuid");
1160
}
1161
1162
ret = init_gnutls_global(pubkey, seckey);
1163
if(ret == -1){
1164
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
1166
goto end;
1167
} else {
1168
gnutls_initialized = true;
1169
}
1170
1171
if(mkdtemp(tempdir) == NULL){
1172
perror("mkdtemp");
1173
goto end;
1174
}
1175
tempdir_created = true;
1176
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
1178
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
1180
goto end;
1181
} else {
1182
gpgme_initialized = true;
1183
}
1184
1185
if(interface[0] != '\0'){
832
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
833
1187
if(if_index == 0){
834
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
835
exit(EXIT_FAILURE);
836
}
837
838
if(connect_to != NULL){
839
/* Connect directly, do not use Zeroconf */
840
/* (Mainly meant for debugging) */
841
char *address = strrchr(connect_to, ':');
842
if(address == NULL){
843
fprintf(stderr, "No colon in address\n");
844
exitcode = EXIT_FAILURE;
845
goto end;
846
}
847
errno = 0;
848
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
849
if(errno){
850
perror("Bad port number");
851
exitcode = EXIT_FAILURE;
852
goto end;
853
}
854
*address = '\0';
855
address = connect_to;
856
ret = start_mandos_communication(address, port, if_index, &mc);
857
if(ret < 0){
858
exitcode = EXIT_FAILURE;
859
} else {
860
exitcode = EXIT_SUCCESS;
861
}
862
goto end;
863
}
864
865
/* If the interface is down, bring it up */
866
{
867
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
868
if(sd < 0) {
869
perror("socket");
870
exitcode = EXIT_FAILURE;
871
goto end;
872
}
873
strcpy(network.ifr_name, interface); /* Spurious warning */
874
ret = ioctl(sd, SIOCGIFFLAGS, &network);
875
if(ret == -1){
876
perror("ioctl SIOCGIFFLAGS");
877
exitcode = EXIT_FAILURE;
878
goto end;
879
}
880
if((network.ifr_flags & IFF_UP) == 0){
881
network.ifr_flags |= IFF_UP;
882
ret = ioctl(sd, SIOCSIFFLAGS, &network);
883
if(ret == -1){
884
perror("ioctl SIOCSIFFLAGS");
885
exitcode = EXIT_FAILURE;
886
goto end;
887
}
888
}
889
close(sd);
890
}
891
892
if (not debug){
893
avahi_set_log_function(empty_log);
894
}
895
896
/* Initialize the pseudo-RNG for Avahi */
897
srand((unsigned int) time(NULL));
898
899
/* Allocate main Avahi loop object */
900
mc.simple_poll = avahi_simple_poll_new();
901
if (mc.simple_poll == NULL) {
902
fprintf(stderr, "Avahi: Failed to create simple poll"
903
" object.\n");
904
exitcode = EXIT_FAILURE;
905
goto end;
906
}
907
908
{
909
AvahiServerConfig config;
910
/* Do not publish any local Zeroconf records */
911
avahi_server_config_init(&config);
912
config.publish_hinfo = 0;
913
config.publish_addresses = 0;
914
config.publish_workstation = 0;
915
config.publish_domain = 0;
916
917
/* Allocate a new server */
918
mc.server = avahi_server_new(avahi_simple_poll_get
919
(mc.simple_poll), &config, NULL,
920
NULL, &error);
921
922
/* Free the Avahi configuration data */
923
avahi_server_config_free(&config);
924
}
925
926
/* Check if creating the Avahi server object succeeded */
927
if (mc.server == NULL) {
928
fprintf(stderr, "Failed to create Avahi server: %s\n",
929
avahi_strerror(error));
930
exitcode = EXIT_FAILURE;
931
goto end;
932
}
933
934
/* Create the Avahi service browser */
935
sb = avahi_s_service_browser_new(mc.server, if_index,
936
AVAHI_PROTO_INET6,
937
"_mandos._tcp", NULL, 0,
938
browse_callback, &mc);
939
if (sb == NULL) {
940
fprintf(stderr, "Failed to create service browser: %s\n",
941
avahi_strerror(avahi_server_errno(mc.server)));
942
exitcode = EXIT_FAILURE;
943
goto end;
944
}
945
946
/* Run the main loop */
947
948
if (debug){
949
fprintf(stderr, "Starting Avahi loop search\n");
950
}
951
952
avahi_simple_poll_loop(mc.simple_poll);
953
1189
exitcode = EXIT_FAILURE;
1190
goto end;
1191
}
1192
}
1193
1194
if(connect_to != NULL){
1195
/* Connect directly, do not use Zeroconf */
1196
/* (Mainly meant for debugging) */
1197
char *address = strrchr(connect_to, ':');
1198
if(address == NULL){
1199
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
1203
uint16_t port;
1204
errno = 0;
1205
tmpmax = strtoimax(address+1, &tmp, 10);
1206
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1207
or tmpmax != (uint16_t)tmpmax){
1208
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
1212
port = (uint16_t)tmpmax;
1213
*address = '\0';
1214
address = connect_to;
1215
/* Colon in address indicates IPv6 */
1216
int af;
1217
if(strchr(address, ':') != NULL){
1218
af = AF_INET6;
1219
} else {
1220
af = AF_INET;
1221
}
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
1226
exitcode = EXIT_SUCCESS;
1227
}
1228
goto end;
1229
}
1230
1231
{
1232
AvahiServerConfig config;
1233
/* Do not publish any local Zeroconf records */
1234
avahi_server_config_init(&config);
1235
config.publish_hinfo = 0;
1236
config.publish_addresses = 0;
1237
config.publish_workstation = 0;
1238
config.publish_domain = 0;
1239
1240
/* Allocate a new server */
1241
mc.server = avahi_server_new(avahi_simple_poll_get
1242
(mc.simple_poll), &config, NULL,
1243
NULL, &error);
1244
1245
/* Free the Avahi configuration data */
1246
avahi_server_config_free(&config);
1247
}
1248
1249
/* Check if creating the Avahi server object succeeded */
1250
if(mc.server == NULL){
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
1252
avahi_strerror(error));
1253
exitcode = EXIT_FAILURE;
1254
goto end;
1255
}
1256
1257
/* Create the Avahi service browser */
1258
sb = avahi_s_service_browser_new(mc.server, if_index,
1259
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1260
NULL, 0, browse_callback, NULL);
1261
if(sb == NULL){
1262
fprintf(stderr, "Failed to create service browser: %s\n",
1263
avahi_strerror(avahi_server_errno(mc.server)));
1264
exitcode = EXIT_FAILURE;
1265
goto end;
1266
}
1267
1268
/* Run the main loop */
1269
1270
if(debug){
1271
fprintf(stderr, "Starting Avahi loop search\n");
1272
}
1273
1274
avahi_simple_poll_loop(mc.simple_poll);
1275
954
1276
end:
955
956
if (debug){
957
fprintf(stderr, "%s exiting\n", argv[0]);
958
}
959
960
/* Cleanup things */
961
if (sb != NULL)
962
avahi_s_service_browser_free(sb);
963
964
if (mc.server != NULL)
965
avahi_server_free(mc.server);
966
967
if (mc.simple_poll != NULL)
968
avahi_simple_poll_free(mc.simple_poll);
969
free(pubkeyfile);
970
free(seckeyfile);
971
972
return exitcode;
1277
1278
if(debug){
1279
fprintf(stderr, "%s exiting\n", argv[0]);
1280
}
1281
1282
/* Cleanup things */
1283
if(sb != NULL)
1284
avahi_s_service_browser_free(sb);
1285
1286
if(mc.server != NULL)
1287
avahi_server_free(mc.server);
1288
1289
if(mc.simple_poll != NULL)
1290
avahi_simple_poll_free(mc.simple_poll);
1291
1292
if(gnutls_initialized){
1293
gnutls_certificate_free_credentials(mc.cred);
1294
gnutls_global_deinit();
1295
gnutls_dh_params_deinit(mc.dh_params);
1296
}
1297
1298
if(gpgme_initialized){
1299
gpgme_release(mc.ctx);
1300
}
1301
1302
/* Removes the temp directory used by GPGME */
1303
if(tempdir_created){
1304
DIR *d;
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1307
if(d == NULL){
1308
if(errno != ENOENT){
1309
perror("opendir");
1310
}
1311
} else {
1312
while(true){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1315
break;
1316
}
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1322
continue;
1323
}
1324
char *fullname = NULL;
1325
ret = asprintf(&fullname, "%s/%s", tempdir,
1326
direntry->d_name);
1327
if(ret < 0){
1328
perror("asprintf");
1329
continue;
1330
}
1331
ret = remove(fullname);
1332
if(ret == -1){
1333
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1334
strerror(errno));
1335
}
1336
free(fullname);
1337
}
1338
closedir(d);
1339
}
1340
ret = rmdir(tempdir);
1341
if(ret == -1 and errno != ENOENT){
1342
perror("rmdir");
1343
}
1344
}
1345
1346
return exitcode;
973
1347
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0