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- Committer: Björn Påhlsson
- Date: 2008-08-04 15:50:45 UTC
- mfrom: (41 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 42.
- Revision ID: belorn@braxen-20080804155045-gnodwjn34v0a2vhr
merge
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugins.d/mandosclient.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
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() */
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 */
67
44
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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, sig_atomic_t,
84
raise() */
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_* */
45
SIOCSIFFLAGS */
46
94
47
#include <avahi-core/core.h>
95
48
#include <avahi-core/lookup.h>
96
49
#include <avahi-core/log.h>
98
51
#include <avahi-common/malloc.h>
99
52
#include <avahi-common/error.h>
100
53
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 */
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 */
110
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 */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
70
argp_parse() */
111
71
/* GPGME */
112
#include <gpgme.h> /* All GPGME types, constants and
113
functions:
114
gpgme_*
115
GPGME_PROTOCOL_OpenPGP,
116
GPG_ERR_NO_* */
72
#include <errno.h> /* perror() */
73
#include <gpgme.h>
117
74
118
75
#define BUFFER_SIZE 256
119
76
120
#define PATHDIR "/conf/conf.d/mandos"
121
#define SECKEY "seckey.txt"
122
#define PUBKEY "pubkey.txt"
123
124
77
bool debug = false;
125
static const char mandos_protocol_version[] = "1";
126
const char *argp_program_version = "mandos-client " VERSION;
78
const char *keydir = "/conf/conf.d/mandos";
79
const char *argp_program_version = "mandosclient 0.9";
127
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
const char mandos_protocol_version[] = "1";
128
82
129
/* Used for passing in values through the Avahi callback functions */
83
/* Used for passing in values through all the callback functions */
130
84
typedef struct {
131
85
AvahiSimplePoll *simple_poll;
132
86
AvahiServer *server;
134
88
unsigned int dh_bits;
135
89
gnutls_dh_params_t dh_params;
136
90
const char *priority;
137
gpgme_ctx_t ctx;
138
91
} mandos_context;
139
92
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,
93
size_t adjustbuffer(char **buffer, size_t buffer_length,
151
94
size_t buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
95
if (buffer_length + BUFFER_SIZE > buffer_capacity){
153
96
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
97
if (buffer == NULL){
155
98
return 0;
156
99
}
157
100
buffer_capacity += BUFFER_SIZE;
160
103
}
161
104
162
105
/*
163
* Initialize GPGME.
106
* Decrypt OpenPGP data using keyrings in HOMEDIR.
107
* Returns -1 on error
164
108
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
109
static ssize_t pgp_packet_decrypt (const char *cryptotext,
110
size_t crypto_size,
111
char **plaintext,
112
const char *homedir){
113
gpgme_data_t dh_crypto, dh_plain;
114
gpgme_ctx_t ctx;
168
115
gpgme_error_t rc;
116
ssize_t ret;
117
size_t plaintext_capacity = 0;
118
ssize_t plaintext_length = 0;
169
119
gpgme_engine_info_t engine_info;
170
120
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");
121
if (debug){
122
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
209
123
}
210
124
211
125
/* Init GPGME */
212
126
gpgme_check_version(NULL);
213
127
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
if(rc != GPG_ERR_NO_ERROR){
128
if (rc != GPG_ERR_NO_ERROR){
215
129
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
130
gpgme_strsource(rc), gpgme_strerror(rc));
217
return false;
131
return -1;
218
132
}
219
133
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){
134
/* Set GPGME home directory for the OpenPGP engine only */
135
rc = gpgme_get_engine_info (&engine_info);
136
if (rc != GPG_ERR_NO_ERROR){
223
137
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
138
gpgme_strsource(rc), gpgme_strerror(rc));
225
return false;
139
return -1;
226
140
}
227
141
while(engine_info != NULL){
228
142
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
229
143
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
230
engine_info->file_name, tempdir);
144
engine_info->file_name, homedir);
231
145
break;
232
146
}
233
147
engine_info = engine_info->next;
234
148
}
235
149
if(engine_info == NULL){
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");
150
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
151
return -1;
270
152
}
271
153
272
154
/* Create new GPGME data buffer from memory cryptotext */
273
155
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
156
0);
275
if(rc != GPG_ERR_NO_ERROR){
157
if (rc != GPG_ERR_NO_ERROR){
276
158
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
159
gpgme_strsource(rc), gpgme_strerror(rc));
278
160
return -1;
280
162
281
163
/* Create new empty GPGME data buffer for the plaintext */
282
164
rc = gpgme_data_new(&dh_plain);
283
if(rc != GPG_ERR_NO_ERROR){
165
if (rc != GPG_ERR_NO_ERROR){
284
166
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
167
gpgme_strsource(rc), gpgme_strerror(rc));
286
168
gpgme_data_release(dh_crypto);
287
169
return -1;
288
170
}
289
171
172
/* Create new GPGME "context" */
173
rc = gpgme_new(&ctx);
174
if (rc != GPG_ERR_NO_ERROR){
175
fprintf(stderr, "bad gpgme_new: %s: %s\n",
176
gpgme_strsource(rc), gpgme_strerror(rc));
177
plaintext_length = -1;
178
goto decrypt_end;
179
}
180
290
181
/* Decrypt data from the cryptotext data buffer to the plaintext
291
182
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
183
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
184
if (rc != GPG_ERR_NO_ERROR){
294
185
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
186
gpgme_strsource(rc), gpgme_strerror(rc));
296
187
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;
188
goto decrypt_end;
189
}
190
191
if(debug){
192
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
193
}
194
195
if (debug){
196
gpgme_decrypt_result_t result;
197
result = gpgme_op_decrypt_result(ctx);
198
if (result == NULL){
199
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
200
} else {
201
fprintf(stderr, "Unsupported algorithm: %s\n",
202
result->unsupported_algorithm);
203
fprintf(stderr, "Wrong key usage: %d\n",
204
result->wrong_key_usage);
205
if(result->file_name != NULL){
206
fprintf(stderr, "File name: %s\n", result->file_name);
207
}
208
gpgme_recipient_t recipient;
209
recipient = result->recipients;
210
if(recipient){
312
211
while(recipient != NULL){
313
212
fprintf(stderr, "Public key algorithm: %s\n",
314
213
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
219
}
321
220
}
322
221
}
323
goto decrypt_end;
324
}
325
326
if(debug){
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
328
222
}
329
223
330
224
/* Seek back to the beginning of the GPGME plaintext data buffer */
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
332
perror("gpgme_data_seek");
225
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
226
perror("pgpme_data_seek");
333
227
plaintext_length = -1;
334
228
goto decrypt_end;
335
229
}
336
230
337
231
*plaintext = NULL;
338
232
while(true){
339
plaintext_capacity = incbuffer(plaintext,
340
(size_t)plaintext_length,
233
plaintext_capacity = adjustbuffer(plaintext, (size_t)plaintext_length,
341
234
plaintext_capacity);
342
if(plaintext_capacity == 0){
343
perror("incbuffer");
235
if (plaintext_capacity == 0){
236
perror("adjustbuffer");
344
237
plaintext_length = -1;
345
238
goto decrypt_end;
346
239
}
348
241
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
349
242
BUFFER_SIZE);
350
243
/* Print the data, if any */
351
if(ret == 0){
244
if (ret == 0){
352
245
/* EOF */
353
246
break;
354
247
}
359
252
}
360
253
plaintext_length += ret;
361
254
}
362
255
363
256
if(debug){
364
257
fprintf(stderr, "Decrypted password is: ");
365
258
for(ssize_t i = 0; i < plaintext_length; i++){
378
271
return plaintext_length;
379
272
}
380
273
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)
274
static const char * safer_gnutls_strerror (int value) {
275
const char *ret = gnutls_strerror (value);
276
if (ret == NULL)
385
277
ret = "(unknown)";
386
278
return ret;
387
279
}
392
284
fprintf(stderr, "GnuTLS: %s", string);
393
285
}
394
286
395
static int init_gnutls_global(const char *pubkeyfilename,
396
const char *seckeyfilename){
287
static int init_gnutls_global(mandos_context *mc,
288
const char *pubkeyfile,
289
const char *seckeyfile){
397
290
int ret;
398
291
399
292
if(debug){
400
293
fprintf(stderr, "Initializing GnuTLS\n");
401
294
}
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));
295
296
if ((ret = gnutls_global_init ())
297
!= GNUTLS_E_SUCCESS) {
298
fprintf (stderr, "GnuTLS global_init: %s\n",
299
safer_gnutls_strerror(ret));
407
300
return -1;
408
301
}
409
302
410
if(debug){
303
if (debug){
411
304
/* "Use a log level over 10 to enable all debugging options."
412
305
* - GnuTLS manual
413
306
*/
416
309
}
417
310
418
311
/* OpenPGP credentials */
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();
312
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
313
!= GNUTLS_E_SUCCESS) {
314
fprintf (stderr, "GnuTLS memory error: %s\n",
315
safer_gnutls_strerror(ret));
427
316
return -1;
428
317
}
429
318
430
319
if(debug){
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
433
seckeyfilename);
320
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
321
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
322
seckeyfile);
434
323
}
435
324
436
325
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
438
GNUTLS_OPENPGP_FMT_BASE64);
439
if(ret != GNUTLS_E_SUCCESS){
326
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
327
if (ret != GNUTLS_E_SUCCESS) {
440
328
fprintf(stderr,
441
329
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
330
" '%s')\n", ret, pubkeyfile, seckeyfile);
331
fprintf(stdout, "The GnuTLS error is: %s\n",
444
332
safer_gnutls_strerror(ret));
445
goto globalfail;
333
return -1;
446
334
}
447
335
448
336
/* GnuTLS server initialization */
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
337
ret = gnutls_dh_params_init(&mc->dh_params);
338
if (ret != GNUTLS_E_SUCCESS) {
339
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
340
" %s\n", safer_gnutls_strerror(ret));
341
return -1;
342
}
343
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
344
if (ret != GNUTLS_E_SUCCESS) {
345
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
346
safer_gnutls_strerror(ret));
347
return -1;
348
}
349
350
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
351
464
352
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
353
}
473
354
474
static int init_gnutls_session(gnutls_session_t *session){
355
static int init_gnutls_session(mandos_context *mc, gnutls_session_t *session){
475
356
int ret;
476
357
/* GnuTLS session creation */
477
358
ret = gnutls_init(session, GNUTLS_SERVER);
478
if(ret != GNUTLS_E_SUCCESS){
359
if (ret != GNUTLS_E_SUCCESS){
479
360
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
361
safer_gnutls_strerror(ret));
481
362
}
482
363
483
364
{
484
365
const char *err;
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
486
if(ret != GNUTLS_E_SUCCESS){
366
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
367
if (ret != GNUTLS_E_SUCCESS) {
487
368
fprintf(stderr, "Syntax error at: %s\n", err);
488
369
fprintf(stderr, "GnuTLS error: %s\n",
489
370
safer_gnutls_strerror(ret));
490
gnutls_deinit(*session);
491
371
return -1;
492
372
}
493
373
}
494
374
495
375
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
497
if(ret != GNUTLS_E_SUCCESS){
376
mc->cred);
377
if (ret != GNUTLS_E_SUCCESS) {
498
378
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
379
safer_gnutls_strerror(ret));
500
gnutls_deinit(*session);
501
380
return -1;
502
381
}
503
382
504
383
/* ignore client certificate if any. */
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
384
gnutls_certificate_server_set_request (*session,
385
GNUTLS_CERT_IGNORE);
507
386
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
387
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
509
388
510
389
return 0;
511
390
}
514
393
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
515
394
__attribute__((unused)) const char *txt){}
516
395
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
520
396
/* Called when a Mandos server is found */
521
397
static int start_mandos_communication(const char *ip, uint16_t port,
522
398
AvahiIfIndex if_index,
523
int af){
524
int ret, tcp_sd = -1;
525
ssize_t sret;
526
union {
527
struct sockaddr_in in;
528
struct sockaddr_in6 in6;
529
} to;
399
mandos_context *mc){
400
int ret, tcp_sd;
401
struct sockaddr_in6 to;
530
402
char *buffer = NULL;
531
403
char *decrypted_buffer;
532
404
size_t buffer_length = 0;
534
406
ssize_t decrypted_buffer_size;
535
407
size_t written;
536
408
int retval = 0;
409
char interface[IF_NAMESIZE];
537
410
gnutls_session_t session;
538
int pf; /* Protocol family */
539
540
if(quit_now){
541
return -1;
542
}
543
544
switch(af){
545
case AF_INET6:
546
pf = PF_INET6;
547
break;
548
case AF_INET:
549
pf = PF_INET;
550
break;
551
default:
552
fprintf(stderr, "Bad address family: %d\n", af);
553
return -1;
554
}
555
556
ret = init_gnutls_session(&session);
557
if(ret != 0){
411
gnutls_dh_params_t dh_params;
412
413
ret = init_gnutls_session (mc, &session);
414
if (ret != 0){
558
415
return -1;
559
416
}
560
417
561
418
if(debug){
562
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
563
"\n", ip, port);
419
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
420
ip, port);
564
421
}
565
422
566
tcp_sd = socket(pf, SOCK_STREAM, 0);
567
if(tcp_sd < 0){
423
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
424
if(tcp_sd < 0) {
568
425
perror("socket");
569
retval = -1;
570
goto mandos_end;
571
}
572
573
if(quit_now){
574
goto mandos_end;
575
}
576
577
memset(&to, 0, sizeof(to));
578
if(af == AF_INET6){
579
to.in6.sin6_family = (sa_family_t)af;
580
ret = inet_pton(af, ip, &to.in6.sin6_addr);
581
} else { /* IPv4 */
582
to.in.sin_family = (sa_family_t)af;
583
ret = inet_pton(af, ip, &to.in.sin_addr);
584
}
585
if(ret < 0 ){
426
return -1;
427
}
428
429
if(debug){
430
if(if_indextoname((unsigned int)if_index, interface) == NULL){
431
perror("if_indextoname");
432
return -1;
433
}
434
fprintf(stderr, "Binding to interface %s\n", interface);
435
}
436
437
memset(&to,0,sizeof(to)); /* Spurious warning */
438
to.sin6_family = AF_INET6;
439
/* It would be nice to have a way to detect if we were passed an
440
IPv4 address here. Now we assume an IPv6 address. */
441
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
442
if (ret < 0 ){
586
443
perror("inet_pton");
587
retval = -1;
588
goto mandos_end;
444
return -1;
589
445
}
590
446
if(ret == 0){
591
447
fprintf(stderr, "Bad address: %s\n", ip);
592
retval = -1;
593
goto mandos_end;
594
}
595
if(af == AF_INET6){
596
to.in6.sin6_port = htons(port); /* Spurious warnings from
597
-Wconversion and
598
-Wunreachable-code */
599
600
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
601
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
602
-Wunreachable-code*/
603
if(if_index == AVAHI_IF_UNSPEC){
604
fprintf(stderr, "An IPv6 link-local address is incomplete"
605
" without a network interface\n");
606
retval = -1;
607
goto mandos_end;
608
}
609
/* Set the network interface number as scope */
610
to.in6.sin6_scope_id = (uint32_t)if_index;
611
}
612
} else {
613
to.in.sin_port = htons(port); /* Spurious warnings from
614
-Wconversion and
615
-Wunreachable-code */
616
}
448
return -1;
449
}
450
to.sin6_port = htons(port); /* Spurious warning */
617
451
618
if(quit_now){
619
goto mandos_end;
620
}
452
to.sin6_scope_id = (uint32_t)if_index;
621
453
622
454
if(debug){
623
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
624
char interface[IF_NAMESIZE];
625
if(if_indextoname((unsigned int)if_index, interface) == NULL){
626
perror("if_indextoname");
627
} else {
628
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
629
ip, interface, port);
630
}
631
} else {
632
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
633
port);
634
}
635
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
636
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
637
const char *pcret;
638
if(af == AF_INET6){
639
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
640
sizeof(addrstr));
641
} else {
642
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
643
sizeof(addrstr));
644
}
645
if(pcret == NULL){
455
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
456
char addrstr[INET6_ADDRSTRLEN] = "";
457
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
458
sizeof(addrstr)) == NULL){
646
459
perror("inet_ntop");
647
460
} else {
648
461
if(strcmp(addrstr, ip) != 0){
651
464
}
652
465
}
653
466
654
if(quit_now){
655
goto mandos_end;
656
}
657
658
if(af == AF_INET6){
659
ret = connect(tcp_sd, &to.in6, sizeof(to));
660
} else {
661
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
662
}
663
if(ret < 0){
467
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
468
if (ret < 0){
664
469
perror("connect");
665
retval = -1;
666
goto mandos_end;
667
}
668
669
if(quit_now){
670
goto mandos_end;
671
}
672
470
return -1;
471
}
472
673
473
const char *out = mandos_protocol_version;
674
474
written = 0;
675
while(true){
475
while (true){
676
476
size_t out_size = strlen(out);
677
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
477
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
678
478
out_size - written));
679
if(ret == -1){
479
if (ret == -1){
680
480
perror("write");
681
481
retval = -1;
682
482
goto mandos_end;
685
485
if(written < out_size){
686
486
continue;
687
487
} else {
688
if(out == mandos_protocol_version){
488
if (out == mandos_protocol_version){
689
489
written = 0;
690
490
out = "\r\n";
691
491
} else {
692
492
break;
693
493
}
694
494
}
695
696
if(quit_now){
697
goto mandos_end;
698
}
699
495
}
700
496
701
497
if(debug){
702
498
fprintf(stderr, "Establishing TLS session with %s\n", ip);
703
499
}
704
500
705
if(quit_now){
706
goto mandos_end;
707
}
708
709
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
710
711
if(quit_now){
712
goto mandos_end;
713
}
714
715
do{
716
ret = gnutls_handshake(session);
717
if(quit_now){
718
goto mandos_end;
719
}
720
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
721
722
if(ret != GNUTLS_E_SUCCESS){
501
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
502
503
ret = gnutls_handshake (session);
504
505
if (ret != GNUTLS_E_SUCCESS){
723
506
if(debug){
724
507
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
725
gnutls_perror(ret);
508
gnutls_perror (ret);
726
509
}
727
510
retval = -1;
728
511
goto mandos_end;
731
514
/* Read OpenPGP packet that contains the wanted password */
732
515
733
516
if(debug){
734
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
517
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
735
518
ip);
736
519
}
737
520
738
521
while(true){
739
740
if(quit_now){
741
goto mandos_end;
742
}
743
744
buffer_capacity = incbuffer(&buffer, buffer_length,
745
buffer_capacity);
746
if(buffer_capacity == 0){
747
perror("incbuffer");
522
buffer_capacity = adjustbuffer(&buffer, buffer_length, buffer_capacity);
523
if (buffer_capacity == 0){
524
perror("adjustbuffer");
748
525
retval = -1;
749
526
goto mandos_end;
750
527
}
751
528
752
if(quit_now){
753
goto mandos_end;
754
}
755
756
sret = gnutls_record_recv(session, buffer+buffer_length,
757
BUFFER_SIZE);
758
if(sret == 0){
529
ret = gnutls_record_recv(session, buffer+buffer_length,
530
BUFFER_SIZE);
531
if (ret == 0){
759
532
break;
760
533
}
761
if(sret < 0){
762
switch(sret){
534
if (ret < 0){
535
switch(ret){
763
536
case GNUTLS_E_INTERRUPTED:
764
537
case GNUTLS_E_AGAIN:
765
538
break;
766
539
case GNUTLS_E_REHANDSHAKE:
767
do{
768
ret = gnutls_handshake(session);
769
770
if(quit_now){
771
goto mandos_end;
772
}
773
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
774
if(ret < 0){
540
ret = gnutls_handshake (session);
541
if (ret < 0){
775
542
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
776
gnutls_perror(ret);
543
gnutls_perror (ret);
777
544
retval = -1;
778
545
goto mandos_end;
779
546
}
782
549
fprintf(stderr, "Unknown error while reading data from"
783
550
" encrypted session with Mandos server\n");
784
551
retval = -1;
785
gnutls_bye(session, GNUTLS_SHUT_RDWR);
552
gnutls_bye (session, GNUTLS_SHUT_RDWR);
786
553
goto mandos_end;
787
554
}
788
555
} else {
789
buffer_length += (size_t) sret;
556
buffer_length += (size_t) ret;
790
557
}
791
558
}
792
559
794
561
fprintf(stderr, "Closing TLS session\n");
795
562
}
796
563
797
if(quit_now){
798
goto mandos_end;
799
}
800
801
gnutls_bye(session, GNUTLS_SHUT_RDWR);
802
803
if(quit_now){
804
goto mandos_end;
805
}
806
807
if(buffer_length > 0){
564
gnutls_bye (session, GNUTLS_SHUT_RDWR);
565
566
if (buffer_length > 0){
808
567
decrypted_buffer_size = pgp_packet_decrypt(buffer,
809
568
buffer_length,
810
&decrypted_buffer);
811
if(decrypted_buffer_size >= 0){
569
&decrypted_buffer,
570
keydir);
571
if (decrypted_buffer_size >= 0){
812
572
written = 0;
813
573
while(written < (size_t) decrypted_buffer_size){
814
if(quit_now){
815
goto mandos_end;
816
}
817
818
ret = (int)fwrite(decrypted_buffer + written, 1,
819
(size_t)decrypted_buffer_size - written,
820
stdout);
574
ret = (int)fwrite (decrypted_buffer + written, 1,
575
(size_t)decrypted_buffer_size - written,
576
stdout);
821
577
if(ret == 0 and ferror(stdout)){
822
578
if(debug){
823
579
fprintf(stderr, "Error writing encrypted data: %s\n",
832
588
} else {
833
589
retval = -1;
834
590
}
835
} else {
836
retval = -1;
837
591
}
838
592
839
593
/* Shutdown procedure */
840
594
841
595
mandos_end:
842
596
free(buffer);
843
if(tcp_sd >= 0){
844
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
845
}
846
if(ret == -1){
847
perror("close");
848
}
849
gnutls_deinit(session);
850
if(quit_now){
851
retval = -1;
852
}
597
close(tcp_sd);
598
gnutls_deinit (session);
599
gnutls_certificate_free_credentials (mc->cred);
600
gnutls_global_deinit ();
853
601
return retval;
854
602
}
855
603
856
604
static void resolve_callback(AvahiSServiceResolver *r,
857
605
AvahiIfIndex interface,
858
AvahiProtocol proto,
606
AVAHI_GCC_UNUSED AvahiProtocol protocol,
859
607
AvahiResolverEvent event,
860
608
const char *name,
861
609
const char *type,
866
614
AVAHI_GCC_UNUSED AvahiStringList *txt,
867
615
AVAHI_GCC_UNUSED AvahiLookupResultFlags
868
616
flags,
869
AVAHI_GCC_UNUSED void* userdata){
870
assert(r);
617
void* userdata) {
618
mandos_context *mc = userdata;
619
assert(r); /* Spurious warning */
871
620
872
621
/* Called whenever a service has been resolved successfully or
873
622
timed out */
874
623
875
if(quit_now){
876
return;
877
}
878
879
switch(event){
624
switch (event) {
880
625
default:
881
626
case AVAHI_RESOLVER_FAILURE:
882
627
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
883
628
" of type '%s' in domain '%s': %s\n", name, type, domain,
884
avahi_strerror(avahi_server_errno(mc.server)));
629
avahi_strerror(avahi_server_errno(mc->server)));
885
630
break;
886
631
887
632
case AVAHI_RESOLVER_FOUND:
889
634
char ip[AVAHI_ADDRESS_STR_MAX];
890
635
avahi_address_snprint(ip, sizeof(ip), address);
891
636
if(debug){
892
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
893
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
894
ip, (intmax_t)interface, port);
637
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
638
" port %d\n", name, host_name, ip, interface, port);
895
639
}
896
int ret = start_mandos_communication(ip, port, interface,
897
avahi_proto_to_af(proto));
898
if(ret == 0){
899
avahi_simple_poll_quit(mc.simple_poll);
640
int ret = start_mandos_communication(ip, port, interface, mc);
641
if (ret == 0){
642
exit(EXIT_SUCCESS);
900
643
}
901
644
}
902
645
}
903
646
avahi_s_service_resolver_free(r);
904
647
}
905
648
906
static void browse_callback(AvahiSServiceBrowser *b,
907
AvahiIfIndex interface,
908
AvahiProtocol protocol,
909
AvahiBrowserEvent event,
910
const char *name,
911
const char *type,
912
const char *domain,
913
AVAHI_GCC_UNUSED AvahiLookupResultFlags
914
flags,
915
AVAHI_GCC_UNUSED void* userdata){
916
assert(b);
649
static void browse_callback( AvahiSServiceBrowser *b,
650
AvahiIfIndex interface,
651
AvahiProtocol protocol,
652
AvahiBrowserEvent event,
653
const char *name,
654
const char *type,
655
const char *domain,
656
AVAHI_GCC_UNUSED AvahiLookupResultFlags
657
flags,
658
void* userdata) {
659
mandos_context *mc = userdata;
660
assert(b); /* Spurious warning */
917
661
918
662
/* Called whenever a new services becomes available on the LAN or
919
663
is removed from the LAN */
920
664
921
if(quit_now){
922
return;
923
}
924
925
switch(event){
665
switch (event) {
926
666
default:
927
667
case AVAHI_BROWSER_FAILURE:
928
668
929
669
fprintf(stderr, "(Avahi browser) %s\n",
930
avahi_strerror(avahi_server_errno(mc.server)));
931
avahi_simple_poll_quit(mc.simple_poll);
670
avahi_strerror(avahi_server_errno(mc->server)));
671
avahi_simple_poll_quit(mc->simple_poll);
932
672
return;
933
673
934
674
case AVAHI_BROWSER_NEW:
937
677
the callback function is called the Avahi server will free the
938
678
resolver for us. */
939
679
940
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
941
name, type, domain, protocol, 0,
942
resolve_callback, NULL) == NULL)
680
if (!(avahi_s_service_resolver_new(mc->server, interface,
681
protocol, name, type, domain,
682
AVAHI_PROTO_INET6, 0,
683
resolve_callback, mc)))
943
684
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
944
name, avahi_strerror(avahi_server_errno(mc.server)));
685
name, avahi_strerror(avahi_server_errno(mc->server)));
945
686
break;
946
687
947
688
case AVAHI_BROWSER_REMOVE:
956
697
}
957
698
}
958
699
959
/* stop main loop after sigterm has been called */
960
static void handle_sigterm(int sig){
961
if(quit_now){
962
return;
963
}
964
quit_now = 1;
965
signal_received = sig;
966
int old_errno = errno;
967
if(mc.simple_poll != NULL){
968
avahi_simple_poll_quit(mc.simple_poll);
969
}
970
errno = old_errno;
700
/* Combines file name and path and returns the malloced new
701
string. some sane checks could/should be added */
702
static const char *combinepath(const char *first, const char *second){
703
size_t f_len = strlen(first);
704
size_t s_len = strlen(second);
705
char *tmp = malloc(f_len + s_len + 2);
706
if (tmp == NULL){
707
return NULL;
708
}
709
if(f_len > 0){
710
memcpy(tmp, first, f_len); /* Spurious warning */
711
}
712
tmp[f_len] = '/';
713
if(s_len > 0){
714
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
715
}
716
tmp[f_len + 1 + s_len] = '\0';
717
return tmp;
971
718
}
972
719
720
973
721
int main(int argc, char *argv[]){
974
AvahiSServiceBrowser *sb = NULL;
975
int error;
976
int ret;
977
intmax_t tmpmax;
978
char *tmp;
979
int exitcode = EXIT_SUCCESS;
980
const char *interface = "eth0";
981
struct ifreq network;
982
int sd = -1;
983
bool take_down_interface = false;
984
uid_t uid;
985
gid_t gid;
986
char *connect_to = NULL;
987
char tempdir[] = "/tmp/mandosXXXXXX";
988
bool tempdir_created = false;
989
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
990
const char *seckey = PATHDIR "/" SECKEY;
991
const char *pubkey = PATHDIR "/" PUBKEY;
992
993
bool gnutls_initialized = false;
994
bool gpgme_initialized = false;
995
float delay = 2.5f;
996
997
struct sigaction old_sigterm_action;
998
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
999
1000
{
1001
struct argp_option options[] = {
1002
{ .name = "debug", .key = 128,
1003
.doc = "Debug mode", .group = 3 },
1004
{ .name = "connect", .key = 'c',
1005
.arg = "ADDRESS:PORT",
1006
.doc = "Connect directly to a specific Mandos server",
1007
.group = 1 },
1008
{ .name = "interface", .key = 'i',
1009
.arg = "NAME",
1010
.doc = "Network interface that will be used to search for"
1011
" Mandos servers",
1012
.group = 1 },
1013
{ .name = "seckey", .key = 's',
1014
.arg = "FILE",
1015
.doc = "OpenPGP secret key file base name",
1016
.group = 1 },
1017
{ .name = "pubkey", .key = 'p',
1018
.arg = "FILE",
1019
.doc = "OpenPGP public key file base name",
1020
.group = 2 },
1021
{ .name = "dh-bits", .key = 129,
1022
.arg = "BITS",
1023
.doc = "Bit length of the prime number used in the"
1024
" Diffie-Hellman key exchange",
1025
.group = 2 },
1026
{ .name = "priority", .key = 130,
1027
.arg = "STRING",
1028
.doc = "GnuTLS priority string for the TLS handshake",
1029
.group = 1 },
1030
{ .name = "delay", .key = 131,
1031
.arg = "SECONDS",
1032
.doc = "Maximum delay to wait for interface startup",
1033
.group = 2 },
1034
{ .name = NULL }
1035
};
722
AvahiSServiceBrowser *sb = NULL;
723
int error;
724
int ret;
725
int exitcode = EXIT_SUCCESS;
726
const char *interface = "eth0";
727
struct ifreq network;
728
int sd;
729
uid_t uid;
730
gid_t gid;
731
char *connect_to = NULL;
732
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
733
const char *pubkeyfile = "pubkey.txt";
734
const char *seckeyfile = "seckey.txt";
735
mandos_context mc = { .simple_poll = NULL, .server = NULL,
736
.dh_bits = 1024, .priority = "SECURE256"};
1036
737
1037
error_t parse_opt(int key, char *arg,
1038
struct argp_state *state){
1039
switch(key){
1040
case 128: /* --debug */
1041
debug = true;
1042
break;
1043
case 'c': /* --connect */
1044
connect_to = arg;
1045
break;
1046
case 'i': /* --interface */
1047
interface = arg;
1048
break;
1049
case 's': /* --seckey */
1050
seckey = arg;
1051
break;
1052
case 'p': /* --pubkey */
1053
pubkey = arg;
1054
break;
1055
case 129: /* --dh-bits */
1056
errno = 0;
1057
tmpmax = strtoimax(arg, &tmp, 10);
1058
if(errno != 0 or tmp == arg or *tmp != '\0'
1059
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1060
fprintf(stderr, "Bad number of DH bits\n");
1061
exit(EXIT_FAILURE);
1062
}
1063
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1064
break;
1065
case 130: /* --priority */
1066
mc.priority = arg;
1067
break;
1068
case 131: /* --delay */
1069
errno = 0;
1070
delay = strtof(arg, &tmp);
1071
if(errno != 0 or tmp == arg or *tmp != '\0'){
1072
fprintf(stderr, "Bad delay\n");
1073
exit(EXIT_FAILURE);
1074
}
1075
break;
1076
case ARGP_KEY_ARG:
1077
argp_usage(state);
1078
case ARGP_KEY_END:
1079
break;
1080
default:
1081
return ARGP_ERR_UNKNOWN;
738
{
739
struct argp_option options[] = {
740
{ .name = "debug", .key = 128,
741
.doc = "Debug mode", .group = 3 },
742
{ .name = "connect", .key = 'c',
743
.arg = "IP",
744
.doc = "Connect directly to a sepcified mandos server", .group = 1 },
745
{ .name = "interface", .key = 'i',
746
.arg = "INTERFACE",
747
.doc = "Interface that Avahi will conntect through", .group = 1 },
748
{ .name = "keydir", .key = 'd',
749
.arg = "KEYDIR",
750
.doc = "Directory where the openpgp keyring is", .group = 1 },
751
{ .name = "seckey", .key = 's',
752
.arg = "SECKEY",
753
.doc = "Secret openpgp key for gnutls authentication", .group = 1 },
754
{ .name = "pubkey", .key = 'p',
755
.arg = "PUBKEY",
756
.doc = "Public openpgp key for gnutls authentication", .group = 2 },
757
{ .name = "dh-bits", .key = 129,
758
.arg = "BITS",
759
.doc = "dh-bits to use in gnutls communication", .group = 2 },
760
{ .name = "priority", .key = 130,
761
.arg = "PRIORITY",
762
.doc = "GNUTLS priority", .group = 1 },
763
{ .name = NULL }
764
};
765
766
767
error_t parse_opt (int key, char *arg, struct argp_state *state) {
768
/* Get the INPUT argument from `argp_parse', which we know is a
769
pointer to our plugin list pointer. */
770
switch (key) {
771
case 128:
772
debug = true;
773
break;
774
case 'c':
775
connect_to = arg;
776
break;
777
case 'i':
778
interface = arg;
779
break;
780
case 'd':
781
keydir = arg;
782
break;
783
case 's':
784
seckeyfile = arg;
785
break;
786
case 'p':
787
pubkeyfile = arg;
788
break;
789
case 129:
790
errno = 0;
791
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
792
if (errno){
793
perror("strtol");
794
exit(EXIT_FAILURE);
795
}
796
break;
797
case 130:
798
mc.priority = arg;
799
break;
800
case ARGP_KEY_ARG:
801
argp_usage (state);
802
break;
803
case ARGP_KEY_END:
804
break;
805
default:
806
return ARGP_ERR_UNKNOWN;
807
}
808
return 0;
1082
809
}
1083
return 0;
1084
}
1085
1086
struct argp argp = { .options = options, .parser = parse_opt,
1087
.args_doc = "",
1088
.doc = "Mandos client -- Get and decrypt"
1089
" passwords from a Mandos server" };
1090
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1091
if(ret == ARGP_ERR_UNKNOWN){
1092
fprintf(stderr, "Unknown error while parsing arguments\n");
1093
exitcode = EXIT_FAILURE;
1094
goto end;
1095
}
1096
}
1097
1098
if(not debug){
1099
avahi_set_log_function(empty_log);
1100
}
1101
1102
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1103
from the signal handler */
1104
/* Initialize the pseudo-RNG for Avahi */
1105
srand((unsigned int) time(NULL));
1106
mc.simple_poll = avahi_simple_poll_new();
1107
if(mc.simple_poll == NULL){
1108
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1109
exitcode = EXIT_FAILURE;
1110
goto end;
1111
}
1112
1113
sigemptyset(&sigterm_action.sa_mask);
1114
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1115
if(ret == -1){
1116
perror("sigaddset");
1117
exitcode = EXIT_FAILURE;
1118
goto end;
1119
}
1120
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1121
if(ret == -1){
1122
perror("sigaddset");
1123
exitcode = EXIT_FAILURE;
1124
goto end;
1125
}
1126
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1127
if(ret == -1){
1128
perror("sigaddset");
1129
exitcode = EXIT_FAILURE;
1130
goto end;
1131
}
1132
/* Need to check if the handler is SIG_IGN before handling:
1133
| [[info:libc:Initial Signal Actions]] |
1134
| [[info:libc:Basic Signal Handling]] |
1135
*/
1136
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1137
if(ret == -1){
1138
perror("sigaction");
1139
return EXIT_FAILURE;
1140
}
1141
if(old_sigterm_action.sa_handler != SIG_IGN){
1142
ret = sigaction(SIGINT, &sigterm_action, NULL);
1143
if(ret == -1){
1144
perror("sigaction");
1145
exitcode = EXIT_FAILURE;
1146
goto end;
1147
}
1148
}
1149
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1150
if(ret == -1){
1151
perror("sigaction");
1152
return EXIT_FAILURE;
1153
}
1154
if(old_sigterm_action.sa_handler != SIG_IGN){
1155
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1156
if(ret == -1){
1157
perror("sigaction");
1158
exitcode = EXIT_FAILURE;
1159
goto end;
1160
}
1161
}
1162
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1163
if(ret == -1){
1164
perror("sigaction");
1165
return EXIT_FAILURE;
1166
}
1167
if(old_sigterm_action.sa_handler != SIG_IGN){
1168
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1169
if(ret == -1){
1170
perror("sigaction");
1171
exitcode = EXIT_FAILURE;
1172
goto end;
1173
}
1174
}
1175
1176
/* If the interface is down, bring it up */
1177
if(interface[0] != '\0'){
810
811
struct argp argp = { .options = options, .parser = parse_opt,
812
.args_doc = "",
813
.doc = "Mandos client -- Get and decrypt passwords from mandos server" };
814
argp_parse (&argp, argc, argv, 0, 0, NULL);
815
}
816
817
pubkeyfile = combinepath(keydir, pubkeyfile);
818
if (pubkeyfile == NULL){
819
perror("combinepath");
820
exitcode = EXIT_FAILURE;
821
goto end;
822
}
823
824
seckeyfile = combinepath(keydir, seckeyfile);
825
if (seckeyfile == NULL){
826
perror("combinepath");
827
goto end;
828
}
829
830
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
831
if (ret == -1){
832
fprintf(stderr, "init_gnutls_global\n");
833
goto end;
834
}
835
836
uid = getuid();
837
gid = getgid();
838
839
ret = setuid(uid);
840
if (ret == -1){
841
perror("setuid");
842
}
843
844
setgid(gid);
845
if (ret == -1){
846
perror("setgid");
847
}
848
1178
849
if_index = (AvahiIfIndex) if_nametoindex(interface);
1179
850
if(if_index == 0){
1180
851
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1181
exitcode = EXIT_FAILURE;
1182
goto end;
1183
}
1184
1185
if(quit_now){
1186
goto end;
1187
}
1188
1189
#ifdef __linux__
1190
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1191
messages to mess up the prompt */
1192
ret = klogctl(8, NULL, 5);
1193
bool restore_loglevel = true;
1194
if(ret == -1){
1195
restore_loglevel = false;
1196
perror("klogctl");
1197
}
1198
#endif /* __linux__ */
1199
1200
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1201
if(sd < 0){
1202
perror("socket");
1203
exitcode = EXIT_FAILURE;
1204
#ifdef __linux__
1205
if(restore_loglevel){
1206
ret = klogctl(7, NULL, 0);
1207
if(ret == -1){
1208
perror("klogctl");
1209
}
1210
}
1211
#endif /* __linux__ */
1212
goto end;
1213
}
1214
strcpy(network.ifr_name, interface);
1215
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1216
if(ret == -1){
1217
perror("ioctl SIOCGIFFLAGS");
1218
#ifdef __linux__
1219
if(restore_loglevel){
1220
ret = klogctl(7, NULL, 0);
1221
if(ret == -1){
1222
perror("klogctl");
1223
}
1224
}
1225
#endif /* __linux__ */
1226
exitcode = EXIT_FAILURE;
1227
goto end;
1228
}
1229
if((network.ifr_flags & IFF_UP) == 0){
1230
network.ifr_flags |= IFF_UP;
1231
take_down_interface = true;
1232
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1233
if(ret == -1){
1234
take_down_interface = false;
1235
perror("ioctl SIOCSIFFLAGS");
1236
exitcode = EXIT_FAILURE;
1237
#ifdef __linux__
1238
if(restore_loglevel){
1239
ret = klogctl(7, NULL, 0);
1240
if(ret == -1){
1241
perror("klogctl");
1242
}
1243
}
1244
#endif /* __linux__ */
1245
goto end;
1246
}
1247
}
1248
/* sleep checking until interface is running */
1249
for(int i=0; i < delay * 4; i++){
852
exit(EXIT_FAILURE);
853
}
854
855
if(connect_to != NULL){
856
/* Connect directly, do not use Zeroconf */
857
/* (Mainly meant for debugging) */
858
char *address = strrchr(connect_to, ':');
859
if(address == NULL){
860
fprintf(stderr, "No colon in address\n");
861
exitcode = EXIT_FAILURE;
862
goto end;
863
}
864
errno = 0;
865
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
866
if(errno){
867
perror("Bad port number");
868
exitcode = EXIT_FAILURE;
869
goto end;
870
}
871
*address = '\0';
872
address = connect_to;
873
ret = start_mandos_communication(address, port, if_index, &mc);
874
if(ret < 0){
875
exitcode = EXIT_FAILURE;
876
} else {
877
exitcode = EXIT_SUCCESS;
878
}
879
goto end;
880
}
881
882
/* If the interface is down, bring it up */
883
{
884
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
885
if(sd < 0) {
886
perror("socket");
887
exitcode = EXIT_FAILURE;
888
goto end;
889
}
890
strcpy(network.ifr_name, interface); /* Spurious warning */
1250
891
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1251
892
if(ret == -1){
1252
893
perror("ioctl SIOCGIFFLAGS");
1253
} else if(network.ifr_flags & IFF_RUNNING){
1254
break;
1255
}
1256
struct timespec sleeptime = { .tv_nsec = 250000000 };
1257
ret = nanosleep(&sleeptime, NULL);
1258
if(ret == -1 and errno != EINTR){
1259
perror("nanosleep");
1260
}
1261
}
1262
if(not take_down_interface){
1263
/* We won't need the socket anymore */
1264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1265
if(ret == -1){
1266
perror("close");
1267
}
1268
}
1269
#ifdef __linux__
1270
if(restore_loglevel){
1271
/* Restores kernel loglevel to default */
1272
ret = klogctl(7, NULL, 0);
1273
if(ret == -1){
1274
perror("klogctl");
1275
}
1276
}
1277
#endif /* __linux__ */
1278
}
1279
1280
if(quit_now){
1281
goto end;
1282
}
1283
1284
uid = getuid();
1285
gid = getgid();
1286
1287
errno = 0;
1288
setgid(gid);
1289
if(ret == -1){
1290
perror("setgid");
1291
}
1292
1293
ret = setuid(uid);
1294
if(ret == -1){
1295
perror("setuid");
1296
}
1297
1298
if(quit_now){
1299
goto end;
1300
}
1301
1302
ret = init_gnutls_global(pubkey, seckey);
1303
if(ret == -1){
1304
fprintf(stderr, "init_gnutls_global failed\n");
1305
exitcode = EXIT_FAILURE;
1306
goto end;
1307
} else {
1308
gnutls_initialized = true;
1309
}
1310
1311
if(quit_now){
1312
goto end;
1313
}
1314
1315
tempdir_created = true;
1316
if(mkdtemp(tempdir) == NULL){
1317
tempdir_created = false;
1318
perror("mkdtemp");
1319
goto end;
1320
}
1321
1322
if(quit_now){
1323
goto end;
1324
}
1325
1326
if(not init_gpgme(pubkey, seckey, tempdir)){
1327
fprintf(stderr, "init_gpgme failed\n");
1328
exitcode = EXIT_FAILURE;
1329
goto end;
1330
} else {
1331
gpgme_initialized = true;
1332
}
1333
1334
if(quit_now){
1335
goto end;
1336
}
1337
1338
if(connect_to != NULL){
1339
/* Connect directly, do not use Zeroconf */
1340
/* (Mainly meant for debugging) */
1341
char *address = strrchr(connect_to, ':');
1342
if(address == NULL){
1343
fprintf(stderr, "No colon in address\n");
1344
exitcode = EXIT_FAILURE;
1345
goto end;
1346
}
1347
1348
if(quit_now){
1349
goto end;
1350
}
1351
1352
uint16_t port;
1353
errno = 0;
1354
tmpmax = strtoimax(address+1, &tmp, 10);
1355
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1356
or tmpmax != (uint16_t)tmpmax){
1357
fprintf(stderr, "Bad port number\n");
1358
exitcode = EXIT_FAILURE;
1359
goto end;
1360
}
1361
1362
if(quit_now){
1363
goto end;
1364
}
1365
1366
port = (uint16_t)tmpmax;
1367
*address = '\0';
1368
address = connect_to;
1369
/* Colon in address indicates IPv6 */
1370
int af;
1371
if(strchr(address, ':') != NULL){
1372
af = AF_INET6;
1373
} else {
1374
af = AF_INET;
1375
}
1376
1377
if(quit_now){
1378
goto end;
1379
}
1380
1381
ret = start_mandos_communication(address, port, if_index, af);
1382
if(ret < 0){
1383
exitcode = EXIT_FAILURE;
1384
} else {
1385
exitcode = EXIT_SUCCESS;
1386
}
1387
goto end;
1388
}
1389
1390
if(quit_now){
1391
goto end;
1392
}
1393
1394
{
1395
AvahiServerConfig config;
1396
/* Do not publish any local Zeroconf records */
1397
avahi_server_config_init(&config);
1398
config.publish_hinfo = 0;
1399
config.publish_addresses = 0;
1400
config.publish_workstation = 0;
1401
config.publish_domain = 0;
1402
1403
/* Allocate a new server */
1404
mc.server = avahi_server_new(avahi_simple_poll_get
1405
(mc.simple_poll), &config, NULL,
1406
NULL, &error);
1407
1408
/* Free the Avahi configuration data */
1409
avahi_server_config_free(&config);
1410
}
1411
1412
/* Check if creating the Avahi server object succeeded */
1413
if(mc.server == NULL){
1414
fprintf(stderr, "Failed to create Avahi server: %s\n",
1415
avahi_strerror(error));
1416
exitcode = EXIT_FAILURE;
1417
goto end;
1418
}
1419
1420
if(quit_now){
1421
goto end;
1422
}
1423
1424
/* Create the Avahi service browser */
1425
sb = avahi_s_service_browser_new(mc.server, if_index,
1426
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1427
NULL, 0, browse_callback, NULL);
1428
if(sb == NULL){
1429
fprintf(stderr, "Failed to create service browser: %s\n",
1430
avahi_strerror(avahi_server_errno(mc.server)));
1431
exitcode = EXIT_FAILURE;
1432
goto end;
1433
}
1434
1435
if(quit_now){
1436
goto end;
1437
}
1438
1439
/* Run the main loop */
1440
1441
if(debug){
1442
fprintf(stderr, "Starting Avahi loop search\n");
1443
}
1444
1445
avahi_simple_poll_loop(mc.simple_poll);
1446
894
exitcode = EXIT_FAILURE;
895
goto end;
896
}
897
if((network.ifr_flags & IFF_UP) == 0){
898
network.ifr_flags |= IFF_UP;
899
ret = ioctl(sd, SIOCSIFFLAGS, &network);
900
if(ret == -1){
901
perror("ioctl SIOCSIFFLAGS");
902
exitcode = EXIT_FAILURE;
903
goto end;
904
}
905
}
906
close(sd);
907
}
908
909
if (not debug){
910
avahi_set_log_function(empty_log);
911
}
912
913
/* Initialize the pseudo-RNG for Avahi */
914
srand((unsigned int) time(NULL));
915
916
/* Allocate main Avahi loop object */
917
mc.simple_poll = avahi_simple_poll_new();
918
if (mc.simple_poll == NULL) {
919
fprintf(stderr, "Avahi: Failed to create simple poll"
920
" object.\n");
921
exitcode = EXIT_FAILURE;
922
goto end;
923
}
924
925
{
926
AvahiServerConfig config;
927
/* Do not publish any local Zeroconf records */
928
avahi_server_config_init(&config);
929
config.publish_hinfo = 0;
930
config.publish_addresses = 0;
931
config.publish_workstation = 0;
932
config.publish_domain = 0;
933
934
/* Allocate a new server */
935
mc.server = avahi_server_new(avahi_simple_poll_get
936
(mc.simple_poll), &config, NULL,
937
NULL, &error);
938
939
/* Free the Avahi configuration data */
940
avahi_server_config_free(&config);
941
}
942
943
/* Check if creating the Avahi server object succeeded */
944
if (mc.server == NULL) {
945
fprintf(stderr, "Failed to create Avahi server: %s\n",
946
avahi_strerror(error));
947
exitcode = EXIT_FAILURE;
948
goto end;
949
}
950
951
/* Create the Avahi service browser */
952
sb = avahi_s_service_browser_new(mc.server, if_index,
953
AVAHI_PROTO_INET6,
954
"_mandos._tcp", NULL, 0,
955
browse_callback, &mc);
956
if (sb == NULL) {
957
fprintf(stderr, "Failed to create service browser: %s\n",
958
avahi_strerror(avahi_server_errno(mc.server)));
959
exitcode = EXIT_FAILURE;
960
goto end;
961
}
962
963
/* Run the main loop */
964
965
if (debug){
966
fprintf(stderr, "Starting Avahi loop search\n");
967
}
968
969
avahi_simple_poll_loop(mc.simple_poll);
970
1447
971
end:
1448
1449
if(debug){
1450
fprintf(stderr, "%s exiting\n", argv[0]);
1451
}
1452
1453
/* Cleanup things */
1454
if(sb != NULL)
1455
avahi_s_service_browser_free(sb);
1456
1457
if(mc.server != NULL)
1458
avahi_server_free(mc.server);
1459
1460
if(mc.simple_poll != NULL)
1461
avahi_simple_poll_free(mc.simple_poll);
1462
1463
if(gnutls_initialized){
1464
gnutls_certificate_free_credentials(mc.cred);
1465
gnutls_global_deinit();
1466
gnutls_dh_params_deinit(mc.dh_params);
1467
}
1468
1469
if(gpgme_initialized){
1470
gpgme_release(mc.ctx);
1471
}
1472
1473
/* Take down the network interface */
1474
if(take_down_interface){
1475
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1476
if(ret == -1){
1477
perror("ioctl SIOCGIFFLAGS");
1478
} else if(network.ifr_flags & IFF_UP) {
1479
network.ifr_flags &= ~IFF_UP; /* clear flag */
1480
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1481
if(ret == -1){
1482
perror("ioctl SIOCSIFFLAGS");
1483
}
1484
}
1485
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1486
if(ret == -1){
1487
perror("close");
1488
}
1489
}
1490
1491
/* Removes the temp directory used by GPGME */
1492
if(tempdir_created){
1493
DIR *d;
1494
struct dirent *direntry;
1495
d = opendir(tempdir);
1496
if(d == NULL){
1497
if(errno != ENOENT){
1498
perror("opendir");
1499
}
1500
} else {
1501
while(true){
1502
direntry = readdir(d);
1503
if(direntry == NULL){
1504
break;
1505
}
1506
/* Skip "." and ".." */
1507
if(direntry->d_name[0] == '.'
1508
and (direntry->d_name[1] == '\0'
1509
or (direntry->d_name[1] == '.'
1510
and direntry->d_name[2] == '\0'))){
1511
continue;
1512
}
1513
char *fullname = NULL;
1514
ret = asprintf(&fullname, "%s/%s", tempdir,
1515
direntry->d_name);
1516
if(ret < 0){
1517
perror("asprintf");
1518
continue;
1519
}
1520
ret = remove(fullname);
1521
if(ret == -1){
1522
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1523
strerror(errno));
1524
}
1525
free(fullname);
1526
}
1527
closedir(d);
1528
}
1529
ret = rmdir(tempdir);
1530
if(ret == -1 and errno != ENOENT){
1531
perror("rmdir");
1532
}
1533
}
1534
1535
if(quit_now){
1536
sigemptyset(&old_sigterm_action.sa_mask);
1537
old_sigterm_action.sa_handler = SIG_DFL;
1538
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1539
if(ret == -1){
1540
perror("sigaction");
1541
}
1542
raise(signal_received);
1543
}
1544
1545
return exitcode;
972
973
if (debug){
974
fprintf(stderr, "%s exiting\n", argv[0]);
975
}
976
977
/* Cleanup things */
978
if (sb != NULL)
979
avahi_s_service_browser_free(sb);
980
981
if (mc.server != NULL)
982
avahi_server_free(mc.server);
983
984
if (mc.simple_poll != NULL)
985
avahi_simple_poll_free(mc.simple_poll);
986
free(pubkeyfile);
987
free(seckeyfile);
988
989
return exitcode;
1546
990
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0