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» Revision
24.1.30
(compared to revision 505.2.1)
: plugins.d/password-request.c
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- Committer: Björn Påhlsson
- Date: 2008-08-09 20:07:23 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 56.
- Revision ID: belorn@braxen-20080809200723-4w313fa7w0w912yl
Added more stuff to do
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugins.d/password-request.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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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
26
25
* along with this program. If not, see
27
26
* <http://www.gnu.org/licenses/>.
28
27
*
29
* Contact the authors at <mandos@recompile.se>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
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() */
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
ferror() */
44
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
45
strerror(), memcpy(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
47
#include <net/if.h> /* ifreq, SIOCGIFFLAGS, SIOCSIFFLAGS,
48
IFF_UP */
52
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
50
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t */
57
53
#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() */
54
struct in6_addr, inet_pton(),
55
connect() */
64
56
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
57
#include <errno.h> /* perror(), errno */
58
#include <time.h> /* time() */
68
59
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
60
SIOCSIFFLAGS, if_indextoname(),
70
61
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
74
62
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
63
getuid(), getgid(), setuid(),
64
setgid() */
65
#include <netinet/in.h>
66
#include <arpa/inet.h> /* inet_pton(), htons */
67
#include <iso646.h> /* not, and */
79
68
#include <argp.h> /* struct argp_option, error_t, struct
80
69
argp_state, struct argp,
81
70
argp_parse(), ARGP_KEY_ARG,
82
71
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
89
#ifdef __linux__
90
#include <sys/klog.h> /* klogctl() */
91
#endif /* __linux__ */
92
72
93
73
/* Avahi */
94
74
/* All Avahi types, constants and functions
102
82
#include <avahi-common/error.h>
103
83
104
84
/* GnuTLS */
105
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
106
functions:
85
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
107
86
gnutls_*
108
87
init_gnutls_session(),
109
88
GNUTLS_* */
110
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
112
90
GNUTLS_OPENPGP_FMT_BASE64 */
113
91
114
92
/* GPGME */
115
#include <gpgme.h> /* All GPGME types, constants and
116
functions:
93
#include <gpgme.h> /* All GPGME types, constants and functions
117
94
gpgme_*
118
95
GPGME_PROTOCOL_OpenPGP,
119
96
GPG_ERR_NO_* */
120
97
121
98
#define BUFFER_SIZE 256
122
99
123
#define PATHDIR "/conf/conf.d/mandos"
124
#define SECKEY "seckey.txt"
125
#define PUBKEY "pubkey.txt"
126
127
100
bool debug = false;
101
static const char *keydir = "/conf/conf.d/mandos";
128
102
static const char mandos_protocol_version[] = "1";
129
const char *argp_program_version = "mandos-client " VERSION;
130
const char *argp_program_bug_address = "<mandos@recompile.se>";
131
static const char sys_class_net[] = "/sys/class/net";
132
char *connect_to = NULL;
133
134
/* Doubly linked list that need to be circularly linked when used */
135
typedef struct server{
136
const char *ip;
137
uint16_t port;
138
AvahiIfIndex if_index;
139
int af;
140
struct timespec last_seen;
141
struct server *next;
142
struct server *prev;
143
} server;
103
const char *argp_program_version = "mandosclient 0.9";
104
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
144
105
145
106
/* Used for passing in values through the Avahi callback functions */
146
107
typedef struct {
150
111
unsigned int dh_bits;
151
112
gnutls_dh_params_t dh_params;
152
113
const char *priority;
153
gpgme_ctx_t ctx;
154
server *current_server;
155
114
} mandos_context;
156
115
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
162
163
sig_atomic_t quit_now = 0;
164
int signal_received = 0;
165
166
/* Function to use when printing errors */
167
void perror_plus(const char *print_text){
168
fprintf(stderr, "Mandos plugin %s: ",
169
program_invocation_short_name);
170
perror(print_text);
171
}
172
173
116
/*
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
* bytes. "buffer_capacity" is how much is currently allocated,
117
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
118
* "buffer_capacity" is how much is currently allocated,
176
119
* "buffer_length" is how much is already used.
177
120
*/
178
size_t incbuffer(char **buffer, size_t buffer_length,
121
size_t adjustbuffer(char **buffer, size_t buffer_length,
179
122
size_t buffer_capacity){
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
123
if (buffer_length + BUFFER_SIZE > buffer_capacity){
181
124
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
if(buffer == NULL){
125
if (buffer == NULL){
183
126
return 0;
184
127
}
185
128
buffer_capacity += BUFFER_SIZE;
187
130
return buffer_capacity;
188
131
}
189
132
190
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
194
int ret;
195
server *new_server = malloc(sizeof(server));
196
if(new_server == NULL){
197
perror_plus("malloc");
198
return -1;
199
}
200
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
204
if(new_server->ip == NULL){
205
perror_plus("strdup");
206
return -1;
207
}
208
/* Special case of first server */
209
if (mc.current_server == NULL){
210
new_server->next = new_server;
211
new_server->prev = new_server;
212
mc.current_server = new_server;
213
/* Place the new server last in the list */
214
} else {
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
217
new_server->prev->next = new_server;
218
mc.current_server->prev = new_server;
219
}
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
if(ret == -1){
222
perror_plus("clock_gettime");
223
return -1;
224
}
225
return 0;
226
}
227
228
133
/*
229
* Initialize GPGME.
134
* Decrypt OpenPGP data using keyrings in HOMEDIR.
135
* Returns -1 on error
230
136
*/
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
137
static ssize_t pgp_packet_decrypt (const char *cryptotext,
138
size_t crypto_size,
139
char **plaintext,
140
const char *homedir){
141
gpgme_data_t dh_crypto, dh_plain;
142
gpgme_ctx_t ctx;
233
143
gpgme_error_t rc;
144
ssize_t ret;
145
size_t plaintext_capacity = 0;
146
ssize_t plaintext_length = 0;
234
147
gpgme_engine_info_t engine_info;
235
148
236
237
/*
238
* Helper function to insert pub and seckey to the engine keyring.
239
*/
240
bool import_key(const char *filename){
241
int ret;
242
int fd;
243
gpgme_data_t pgp_data;
244
245
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
246
if(fd == -1){
247
perror_plus("open");
248
return false;
249
}
250
251
rc = gpgme_data_new_from_fd(&pgp_data, fd);
252
if(rc != GPG_ERR_NO_ERROR){
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
254
gpgme_strsource(rc), gpgme_strerror(rc));
255
return false;
256
}
257
258
rc = gpgme_op_import(mc.ctx, pgp_data);
259
if(rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
262
return false;
263
}
264
265
ret = (int)TEMP_FAILURE_RETRY(close(fd));
266
if(ret == -1){
267
perror_plus("close");
268
}
269
gpgme_data_release(pgp_data);
270
return true;
271
}
272
273
if(debug){
274
fprintf(stderr, "Initializing GPGME\n");
149
if (debug){
150
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
275
151
}
276
152
277
153
/* Init GPGME */
278
154
gpgme_check_version(NULL);
279
155
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
280
if(rc != GPG_ERR_NO_ERROR){
156
if (rc != GPG_ERR_NO_ERROR){
281
157
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
158
gpgme_strsource(rc), gpgme_strerror(rc));
283
return false;
159
return -1;
284
160
}
285
161
286
162
/* Set GPGME home directory for the OpenPGP engine only */
287
rc = gpgme_get_engine_info(&engine_info);
288
if(rc != GPG_ERR_NO_ERROR){
163
rc = gpgme_get_engine_info (&engine_info);
164
if (rc != GPG_ERR_NO_ERROR){
289
165
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
166
gpgme_strsource(rc), gpgme_strerror(rc));
291
return false;
167
return -1;
292
168
}
293
169
while(engine_info != NULL){
294
170
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
295
171
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
296
engine_info->file_name, tempdir);
172
engine_info->file_name, homedir);
297
173
break;
298
174
}
299
175
engine_info = engine_info->next;
300
176
}
301
177
if(engine_info == NULL){
302
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
303
return false;
304
}
305
306
/* Create new GPGME "context" */
307
rc = gpgme_new(&(mc.ctx));
308
if(rc != GPG_ERR_NO_ERROR){
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
311
return false;
312
}
313
314
if(not import_key(pubkey) or not import_key(seckey)){
315
return false;
316
}
317
318
return true;
319
}
320
321
/*
322
* Decrypt OpenPGP data.
323
* Returns -1 on error
324
*/
325
static ssize_t pgp_packet_decrypt(const char *cryptotext,
326
size_t crypto_size,
327
char **plaintext){
328
gpgme_data_t dh_crypto, dh_plain;
329
gpgme_error_t rc;
330
ssize_t ret;
331
size_t plaintext_capacity = 0;
332
ssize_t plaintext_length = 0;
333
334
if(debug){
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
178
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
179
return -1;
336
180
}
337
181
338
182
/* Create new GPGME data buffer from memory cryptotext */
339
183
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
340
184
0);
341
if(rc != GPG_ERR_NO_ERROR){
185
if (rc != GPG_ERR_NO_ERROR){
342
186
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
187
gpgme_strsource(rc), gpgme_strerror(rc));
344
188
return -1;
346
190
347
191
/* Create new empty GPGME data buffer for the plaintext */
348
192
rc = gpgme_data_new(&dh_plain);
349
if(rc != GPG_ERR_NO_ERROR){
193
if (rc != GPG_ERR_NO_ERROR){
350
194
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
195
gpgme_strsource(rc), gpgme_strerror(rc));
352
196
gpgme_data_release(dh_crypto);
353
197
return -1;
354
198
}
355
199
200
/* Create new GPGME "context" */
201
rc = gpgme_new(&ctx);
202
if (rc != GPG_ERR_NO_ERROR){
203
fprintf(stderr, "bad gpgme_new: %s: %s\n",
204
gpgme_strsource(rc), gpgme_strerror(rc));
205
plaintext_length = -1;
206
goto decrypt_end;
207
}
208
356
209
/* Decrypt data from the cryptotext data buffer to the plaintext
357
210
data buffer */
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
359
if(rc != GPG_ERR_NO_ERROR){
211
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
212
if (rc != GPG_ERR_NO_ERROR){
360
213
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
214
gpgme_strsource(rc), gpgme_strerror(rc));
362
215
plaintext_length = -1;
363
if(debug){
364
gpgme_decrypt_result_t result;
365
result = gpgme_op_decrypt_result(mc.ctx);
366
if(result == NULL){
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
368
} else {
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
result->wrong_key_usage);
373
if(result->file_name != NULL){
374
fprintf(stderr, "File name: %s\n", result->file_name);
375
}
376
gpgme_recipient_t recipient;
377
recipient = result->recipients;
216
goto decrypt_end;
217
}
218
219
if(debug){
220
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
221
}
222
223
if (debug){
224
gpgme_decrypt_result_t result;
225
result = gpgme_op_decrypt_result(ctx);
226
if (result == NULL){
227
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
228
} else {
229
fprintf(stderr, "Unsupported algorithm: %s\n",
230
result->unsupported_algorithm);
231
fprintf(stderr, "Wrong key usage: %d\n",
232
result->wrong_key_usage);
233
if(result->file_name != NULL){
234
fprintf(stderr, "File name: %s\n", result->file_name);
235
}
236
gpgme_recipient_t recipient;
237
recipient = result->recipients;
238
if(recipient){
378
239
while(recipient != NULL){
379
240
fprintf(stderr, "Public key algorithm: %s\n",
380
241
gpgme_pubkey_algo_name(recipient->pubkey_algo));
386
247
}
387
248
}
388
249
}
389
goto decrypt_end;
390
}
391
392
if(debug){
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
394
250
}
395
251
396
252
/* Seek back to the beginning of the GPGME plaintext data buffer */
397
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
398
perror_plus("gpgme_data_seek");
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
399
255
plaintext_length = -1;
400
256
goto decrypt_end;
401
257
}
402
258
403
259
*plaintext = NULL;
404
260
while(true){
405
plaintext_capacity = incbuffer(plaintext,
261
plaintext_capacity = adjustbuffer(plaintext,
406
262
(size_t)plaintext_length,
407
263
plaintext_capacity);
408
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
264
if (plaintext_capacity == 0){
265
perror("adjustbuffer");
410
266
plaintext_length = -1;
411
267
goto decrypt_end;
412
268
}
414
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
415
271
BUFFER_SIZE);
416
272
/* Print the data, if any */
417
if(ret == 0){
273
if (ret == 0){
418
274
/* EOF */
419
275
break;
420
276
}
421
277
if(ret < 0){
422
perror_plus("gpgme_data_read");
278
perror("gpgme_data_read");
423
279
plaintext_length = -1;
424
280
goto decrypt_end;
425
281
}
426
282
plaintext_length += ret;
427
283
}
428
284
429
285
if(debug){
430
286
fprintf(stderr, "Decrypted password is: ");
431
287
for(ssize_t i = 0; i < plaintext_length; i++){
444
300
return plaintext_length;
445
301
}
446
302
447
static const char * safer_gnutls_strerror(int value){
448
const char *ret = gnutls_strerror(value); /* Spurious warning from
449
-Wunreachable-code */
450
if(ret == NULL)
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value);
305
if (ret == NULL)
451
306
ret = "(unknown)";
452
307
return ret;
453
308
}
458
313
fprintf(stderr, "GnuTLS: %s", string);
459
314
}
460
315
461
static int init_gnutls_global(const char *pubkeyfilename,
462
const char *seckeyfilename){
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfile,
318
const char *seckeyfile){
463
319
int ret;
464
320
465
321
if(debug){
467
323
}
468
324
469
325
ret = gnutls_global_init();
470
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
473
329
return -1;
474
330
}
475
331
476
if(debug){
332
if (debug){
477
333
/* "Use a log level over 10 to enable all debugging options."
478
334
* - GnuTLS manual
479
335
*/
482
338
}
483
339
484
340
/* OpenPGP credentials */
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
486
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
489
gnutls_global_deinit();
341
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n",
344
safer_gnutls_strerror(ret));
345
gnutls_global_deinit ();
490
346
return -1;
491
347
}
492
348
493
349
if(debug){
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
seckeyfilename);
350
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
351
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
352
seckeyfile);
497
353
}
498
354
499
355
ret = gnutls_certificate_set_openpgp_key_file
500
(mc.cred, pubkeyfilename, seckeyfilename,
501
GNUTLS_OPENPGP_FMT_BASE64);
502
if(ret != GNUTLS_E_SUCCESS){
356
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
357
if (ret != GNUTLS_E_SUCCESS) {
503
358
fprintf(stderr,
504
359
"Error[%d] while reading the OpenPGP key pair ('%s',"
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
506
fprintf(stderr, "The GnuTLS error is: %s\n",
360
" '%s')\n", ret, pubkeyfile, seckeyfile);
361
fprintf(stdout, "The GnuTLS error is: %s\n",
507
362
safer_gnutls_strerror(ret));
508
363
goto globalfail;
509
364
}
510
365
511
366
/* GnuTLS server initialization */
512
ret = gnutls_dh_params_init(&mc.dh_params);
513
if(ret != GNUTLS_E_SUCCESS){
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
516
goto globalfail;
517
}
518
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
519
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
522
goto globalfail;
523
}
524
525
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
526
367
ret = gnutls_dh_params_init(&mc->dh_params);
368
if (ret != GNUTLS_E_SUCCESS) {
369
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
370
" %s\n", safer_gnutls_strerror(ret));
371
goto globalfail;
372
}
373
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
374
if (ret != GNUTLS_E_SUCCESS) {
375
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
376
safer_gnutls_strerror(ret));
377
goto globalfail;
378
}
379
380
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
381
527
382
return 0;
528
383
529
384
globalfail:
530
531
gnutls_certificate_free_credentials(mc.cred);
385
386
gnutls_certificate_free_credentials(mc->cred);
532
387
gnutls_global_deinit();
533
gnutls_dh_params_deinit(mc.dh_params);
534
388
return -1;
389
535
390
}
536
391
537
static int init_gnutls_session(gnutls_session_t *session){
392
static int init_gnutls_session(mandos_context *mc,
393
gnutls_session_t *session){
538
394
int ret;
539
395
/* GnuTLS session creation */
540
do {
541
ret = gnutls_init(session, GNUTLS_SERVER);
542
if(quit_now){
543
return -1;
544
}
545
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
546
if(ret != GNUTLS_E_SUCCESS){
396
ret = gnutls_init(session, GNUTLS_SERVER);
397
if (ret != GNUTLS_E_SUCCESS){
547
398
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
399
safer_gnutls_strerror(ret));
549
400
}
550
401
551
402
{
552
403
const char *err;
553
do {
554
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
555
if(quit_now){
556
gnutls_deinit(*session);
557
return -1;
558
}
559
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
560
if(ret != GNUTLS_E_SUCCESS){
404
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
405
if (ret != GNUTLS_E_SUCCESS) {
561
406
fprintf(stderr, "Syntax error at: %s\n", err);
562
407
fprintf(stderr, "GnuTLS error: %s\n",
563
408
safer_gnutls_strerror(ret));
564
gnutls_deinit(*session);
409
gnutls_deinit (*session);
565
410
return -1;
566
411
}
567
412
}
568
413
569
do {
570
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
571
mc.cred);
572
if(quit_now){
573
gnutls_deinit(*session);
574
return -1;
575
}
576
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
577
if(ret != GNUTLS_E_SUCCESS){
414
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
415
mc->cred);
416
if (ret != GNUTLS_E_SUCCESS) {
578
417
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
418
safer_gnutls_strerror(ret));
580
gnutls_deinit(*session);
419
gnutls_deinit (*session);
581
420
return -1;
582
421
}
583
422
584
423
/* ignore client certificate if any. */
585
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
424
gnutls_certificate_server_set_request (*session,
425
GNUTLS_CERT_IGNORE);
586
426
587
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
427
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
588
428
589
429
return 0;
590
430
}
596
436
/* Called when a Mandos server is found */
597
437
static int start_mandos_communication(const char *ip, uint16_t port,
598
438
AvahiIfIndex if_index,
599
int af){
600
int ret, tcp_sd = -1;
601
ssize_t sret;
602
union {
603
struct sockaddr_in in;
604
struct sockaddr_in6 in6;
605
} to;
439
mandos_context *mc){
440
int ret, tcp_sd;
441
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
606
442
char *buffer = NULL;
607
char *decrypted_buffer = NULL;
443
char *decrypted_buffer;
608
444
size_t buffer_length = 0;
609
445
size_t buffer_capacity = 0;
446
ssize_t decrypted_buffer_size;
610
447
size_t written;
611
int retval = -1;
448
int retval = 0;
449
char interface[IF_NAMESIZE];
612
450
gnutls_session_t session;
613
int pf; /* Protocol family */
614
615
errno = 0;
616
617
if(quit_now){
618
errno = EINTR;
619
return -1;
620
}
621
622
switch(af){
623
case AF_INET6:
624
pf = PF_INET6;
625
break;
626
case AF_INET:
627
pf = PF_INET;
628
break;
629
default:
630
fprintf(stderr, "Bad address family: %d\n", af);
631
errno = EINVAL;
632
return -1;
633
}
634
635
ret = init_gnutls_session(&session);
636
if(ret != 0){
637
return -1;
638
}
639
640
if(debug){
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
643
}
644
645
tcp_sd = socket(pf, SOCK_STREAM, 0);
646
if(tcp_sd < 0){
647
int e = errno;
648
perror_plus("socket");
649
errno = e;
650
goto mandos_end;
651
}
652
653
if(quit_now){
654
errno = EINTR;
655
goto mandos_end;
656
}
657
658
memset(&to, 0, sizeof(to));
659
if(af == AF_INET6){
660
to.in6.sin6_family = (sa_family_t)af;
661
ret = inet_pton(af, ip, &to.in6.sin6_addr);
662
} else { /* IPv4 */
663
to.in.sin_family = (sa_family_t)af;
664
ret = inet_pton(af, ip, &to.in.sin_addr);
665
}
666
if(ret < 0 ){
667
int e = errno;
668
perror_plus("inet_pton");
669
errno = e;
670
goto mandos_end;
451
452
ret = init_gnutls_session (mc, &session);
453
if (ret != 0){
454
return -1;
455
}
456
457
if(debug){
458
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
459
ip, port);
460
}
461
462
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
463
if(tcp_sd < 0) {
464
perror("socket");
465
return -1;
466
}
467
468
if(debug){
469
if(if_indextoname((unsigned int)if_index, interface) == NULL){
470
perror("if_indextoname");
471
return -1;
472
}
473
fprintf(stderr, "Binding to interface %s\n", interface);
474
}
475
476
memset(&to,0,sizeof(to)); /* Spurious warning */
477
to.in6.sin6_family = AF_INET6;
478
/* It would be nice to have a way to detect if we were passed an
479
IPv4 address here. Now we assume an IPv6 address. */
480
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
481
if (ret < 0 ){
482
perror("inet_pton");
483
return -1;
671
484
}
672
485
if(ret == 0){
673
int e = errno;
674
486
fprintf(stderr, "Bad address: %s\n", ip);
675
errno = e;
676
goto mandos_end;
677
}
678
if(af == AF_INET6){
679
to.in6.sin6_port = htons(port); /* Spurious warnings from
680
-Wconversion and
681
-Wunreachable-code */
682
683
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
684
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
685
-Wunreachable-code*/
686
if(if_index == AVAHI_IF_UNSPEC){
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
689
errno = EINVAL;
690
goto mandos_end;
691
}
692
/* Set the network interface number as scope */
693
to.in6.sin6_scope_id = (uint32_t)if_index;
694
}
695
} else {
696
to.in.sin_port = htons(port); /* Spurious warnings from
697
-Wconversion and
698
-Wunreachable-code */
699
}
487
return -1;
488
}
489
to.in6.sin6_port = htons(port); /* Spurious warning */
700
490
701
if(quit_now){
702
errno = EINTR;
703
goto mandos_end;
704
}
491
to.in6.sin6_scope_id = (uint32_t)if_index;
705
492
706
493
if(debug){
707
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
708
char interface[IF_NAMESIZE];
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
711
} else {
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
714
}
715
} else {
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
718
}
719
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
720
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
721
const char *pcret;
722
if(af == AF_INET6){
723
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
724
sizeof(addrstr));
725
} else {
726
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
727
sizeof(addrstr));
728
}
729
if(pcret == NULL){
730
perror_plus("inet_ntop");
494
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
495
char addrstr[INET6_ADDRSTRLEN] = "";
496
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
497
sizeof(addrstr)) == NULL){
498
perror("inet_ntop");
731
499
} else {
732
500
if(strcmp(addrstr, ip) != 0){
733
501
fprintf(stderr, "Canonical address form: %s\n", addrstr);
735
503
}
736
504
}
737
505
738
if(quit_now){
739
errno = EINTR;
740
goto mandos_end;
741
}
742
743
if(af == AF_INET6){
744
ret = connect(tcp_sd, &to.in6, sizeof(to));
745
} else {
746
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
747
}
748
if(ret < 0){
749
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
750
int e = errno;
751
perror_plus("connect");
752
errno = e;
753
}
754
goto mandos_end;
755
}
756
757
if(quit_now){
758
errno = EINTR;
759
goto mandos_end;
760
}
761
506
ret = connect(tcp_sd, &to.in, sizeof(to));
507
if (ret < 0){
508
perror("connect");
509
return -1;
510
}
511
762
512
const char *out = mandos_protocol_version;
763
513
written = 0;
764
while(true){
514
while (true){
765
515
size_t out_size = strlen(out);
766
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
517
out_size - written));
768
if(ret == -1){
769
int e = errno;
770
perror_plus("write");
771
errno = e;
518
if (ret == -1){
519
perror("write");
520
retval = -1;
772
521
goto mandos_end;
773
522
}
774
523
written += (size_t)ret;
775
524
if(written < out_size){
776
525
continue;
777
526
} else {
778
if(out == mandos_protocol_version){
527
if (out == mandos_protocol_version){
779
528
written = 0;
780
529
out = "\r\n";
781
530
} else {
782
531
break;
783
532
}
784
533
}
785
786
if(quit_now){
787
errno = EINTR;
788
goto mandos_end;
789
}
790
534
}
791
535
792
536
if(debug){
793
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
794
538
}
795
539
796
if(quit_now){
797
errno = EINTR;
798
goto mandos_end;
799
}
800
801
/* Spurious warning from -Wint-to-pointer-cast */
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
803
804
if(quit_now){
805
errno = EINTR;
806
goto mandos_end;
807
}
808
809
do {
810
ret = gnutls_handshake(session);
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
542
do{
543
ret = gnutls_handshake (session);
815
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
816
545
817
if(ret != GNUTLS_E_SUCCESS){
546
if (ret != GNUTLS_E_SUCCESS){
818
547
if(debug){
819
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
820
gnutls_perror(ret);
549
gnutls_perror (ret);
821
550
}
822
errno = EPROTO;
551
retval = -1;
823
552
goto mandos_end;
824
553
}
825
554
826
555
/* Read OpenPGP packet that contains the wanted password */
827
556
828
557
if(debug){
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
830
559
ip);
831
560
}
832
561
833
562
while(true){
834
835
if(quit_now){
836
errno = EINTR;
837
goto mandos_end;
838
}
839
840
buffer_capacity = incbuffer(&buffer, buffer_length,
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
841
564
buffer_capacity);
842
if(buffer_capacity == 0){
843
int e = errno;
844
perror_plus("incbuffer");
845
errno = e;
846
goto mandos_end;
847
}
848
849
if(quit_now){
850
errno = EINTR;
851
goto mandos_end;
852
}
853
854
sret = gnutls_record_recv(session, buffer+buffer_length,
855
BUFFER_SIZE);
856
if(sret == 0){
565
if (buffer_capacity == 0){
566
perror("adjustbuffer");
567
retval = -1;
568
goto mandos_end;
569
}
570
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
573
if (ret == 0){
857
574
break;
858
575
}
859
if(sret < 0){
860
switch(sret){
576
if (ret < 0){
577
switch(ret){
861
578
case GNUTLS_E_INTERRUPTED:
862
579
case GNUTLS_E_AGAIN:
863
580
break;
864
581
case GNUTLS_E_REHANDSHAKE:
865
do {
866
ret = gnutls_handshake(session);
867
868
if(quit_now){
869
errno = EINTR;
870
goto mandos_end;
871
}
582
do{
583
ret = gnutls_handshake (session);
872
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
873
if(ret < 0){
585
if (ret < 0){
874
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
875
gnutls_perror(ret);
876
errno = EPROTO;
587
gnutls_perror (ret);
588
retval = -1;
877
589
goto mandos_end;
878
590
}
879
591
break;
880
592
default:
881
593
fprintf(stderr, "Unknown error while reading data from"
882
594
" encrypted session with Mandos server\n");
883
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
errno = EIO;
595
retval = -1;
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
885
597
goto mandos_end;
886
598
}
887
599
} else {
888
buffer_length += (size_t) sret;
600
buffer_length += (size_t) ret;
889
601
}
890
602
}
891
603
893
605
fprintf(stderr, "Closing TLS session\n");
894
606
}
895
607
896
if(quit_now){
897
errno = EINTR;
898
goto mandos_end;
899
}
900
901
do {
902
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
903
if(quit_now){
904
errno = EINTR;
905
goto mandos_end;
906
}
907
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
908
909
if(buffer_length > 0){
910
ssize_t decrypted_buffer_size;
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
609
610
if (buffer_length > 0){
911
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
612
buffer_length,
913
&decrypted_buffer);
914
if(decrypted_buffer_size >= 0){
915
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
916
616
written = 0;
917
617
while(written < (size_t) decrypted_buffer_size){
918
if(quit_now){
919
errno = EINTR;
920
goto mandos_end;
921
}
922
923
ret = (int)fwrite(decrypted_buffer + written, 1,
924
(size_t)decrypted_buffer_size - written,
925
stdout);
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
stdout);
926
621
if(ret == 0 and ferror(stdout)){
927
int e = errno;
928
622
if(debug){
929
623
fprintf(stderr, "Error writing encrypted data: %s\n",
930
624
strerror(errno));
931
625
}
932
errno = e;
933
goto mandos_end;
626
retval = -1;
627
break;
934
628
}
935
629
written += (size_t)ret;
936
630
}
937
retval = 0;
631
free(decrypted_buffer);
632
} else {
633
retval = -1;
938
634
}
939
635
}
940
636
941
637
/* Shutdown procedure */
942
638
943
639
mandos_end:
944
{
945
int e = errno;
946
free(decrypted_buffer);
947
free(buffer);
948
if(tcp_sd >= 0){
949
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
950
}
951
if(ret == -1){
952
if(e == 0){
953
e = errno;
954
}
955
perror_plus("close");
956
}
957
gnutls_deinit(session);
958
errno = e;
959
if(quit_now){
960
errno = EINTR;
961
retval = -1;
962
}
963
}
640
free(buffer);
641
close(tcp_sd);
642
gnutls_deinit (session);
964
643
return retval;
965
644
}
966
645
967
646
static void resolve_callback(AvahiSServiceResolver *r,
968
647
AvahiIfIndex interface,
969
AvahiProtocol proto,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
970
649
AvahiResolverEvent event,
971
650
const char *name,
972
651
const char *type,
977
656
AVAHI_GCC_UNUSED AvahiStringList *txt,
978
657
AVAHI_GCC_UNUSED AvahiLookupResultFlags
979
658
flags,
980
AVAHI_GCC_UNUSED void* userdata){
981
assert(r);
659
void* userdata) {
660
mandos_context *mc = userdata;
661
assert(r); /* Spurious warning */
982
662
983
663
/* Called whenever a service has been resolved successfully or
984
664
timed out */
985
665
986
if(quit_now){
987
return;
988
}
989
990
switch(event){
666
switch (event) {
991
667
default:
992
668
case AVAHI_RESOLVER_FAILURE:
993
669
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
994
670
" of type '%s' in domain '%s': %s\n", name, type, domain,
995
avahi_strerror(avahi_server_errno(mc.server)));
671
avahi_strerror(avahi_server_errno(mc->server)));
996
672
break;
997
673
998
674
case AVAHI_RESOLVER_FOUND:
1000
676
char ip[AVAHI_ADDRESS_STR_MAX];
1001
677
avahi_address_snprint(ip, sizeof(ip), address);
1002
678
if(debug){
1003
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1005
ip, (intmax_t)interface, port);
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
680
" port %d\n", name, host_name, ip, interface, port);
1006
681
}
1007
int ret = start_mandos_communication(ip, port, interface,
1008
avahi_proto_to_af(proto));
1009
if(ret == 0){
1010
avahi_simple_poll_quit(mc.simple_poll);
1011
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
682
int ret = start_mandos_communication(ip, port, interface, mc);
683
if (ret == 0){
684
exit(EXIT_SUCCESS);
1014
685
}
1015
686
}
1016
687
}
1017
688
avahi_s_service_resolver_free(r);
1018
689
}
1019
690
1020
static void browse_callback(AvahiSServiceBrowser *b,
1021
AvahiIfIndex interface,
1022
AvahiProtocol protocol,
1023
AvahiBrowserEvent event,
1024
const char *name,
1025
const char *type,
1026
const char *domain,
1027
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1028
flags,
1029
AVAHI_GCC_UNUSED void* userdata){
1030
assert(b);
691
static void browse_callback( AvahiSServiceBrowser *b,
692
AvahiIfIndex interface,
693
AvahiProtocol protocol,
694
AvahiBrowserEvent event,
695
const char *name,
696
const char *type,
697
const char *domain,
698
AVAHI_GCC_UNUSED AvahiLookupResultFlags
699
flags,
700
void* userdata) {
701
mandos_context *mc = userdata;
702
assert(b); /* Spurious warning */
1031
703
1032
704
/* Called whenever a new services becomes available on the LAN or
1033
705
is removed from the LAN */
1034
706
1035
if(quit_now){
1036
return;
1037
}
1038
1039
switch(event){
707
switch (event) {
1040
708
default:
1041
709
case AVAHI_BROWSER_FAILURE:
1042
710
1043
711
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1045
avahi_simple_poll_quit(mc.simple_poll);
712
avahi_strerror(avahi_server_errno(mc->server)));
713
avahi_simple_poll_quit(mc->simple_poll);
1046
714
return;
1047
715
1048
716
case AVAHI_BROWSER_NEW:
1051
719
the callback function is called the Avahi server will free the
1052
720
resolver for us. */
1053
721
1054
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1055
name, type, domain, protocol, 0,
1056
resolve_callback, NULL) == NULL)
722
if (!(avahi_s_service_resolver_new(mc->server, interface,
723
protocol, name, type, domain,
724
AVAHI_PROTO_INET6, 0,
725
resolve_callback, mc)))
1057
726
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
727
name, avahi_strerror(avahi_server_errno(mc->server)));
1059
728
break;
1060
729
1061
730
case AVAHI_BROWSER_REMOVE:
1070
739
}
1071
740
}
1072
741
1073
/* Signal handler that stops main loop after SIGTERM */
1074
static void handle_sigterm(int sig){
1075
if(quit_now){
1076
return;
1077
}
1078
quit_now = 1;
1079
signal_received = sig;
1080
int old_errno = errno;
1081
/* set main loop to exit */
1082
if(mc.simple_poll != NULL){
1083
avahi_simple_poll_quit(mc.simple_poll);
1084
}
1085
errno = old_errno;
1086
}
1087
1088
/*
1089
* This function determines if a directory entry in /sys/class/net
1090
* corresponds to an acceptable network device.
1091
* (This function is passed to scandir(3) as a filter function.)
1092
*/
1093
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
int ret;
1096
if(if_entry->d_name[0] == '.'){
1097
return 0;
1098
}
1099
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1100
if(s < 0){
1101
perror_plus("socket");
1102
return 0;
1103
}
1104
struct ifreq ifr;
1105
strcpy(ifr.ifr_name, if_entry->d_name);
1106
ret = ioctl(s, SIOCGIFFLAGS, &ifr);
1107
if(ret == -1){
1108
if(debug){
1109
perror_plus("ioctl SIOCGIFFLAGS");
1110
}
1111
return 0;
1112
}
1113
/* Reject the loopback device */
1114
if(ifr.ifr_flags & IFF_LOOPBACK){
1115
if(debug){
1116
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1117
if_entry->d_name);
1118
}
1119
return 0;
1120
}
1121
/* Accept point-to-point devices only if connect_to is specified */
1122
if(connect_to != NULL and (ifr.ifr_flags & IFF_POINTOPOINT)){
1123
if(debug){
1124
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1125
if_entry->d_name);
1126
}
1127
return 1;
1128
}
1129
/* Otherwise, reject non-broadcast-capable devices */
1130
if(not (ifr.ifr_flags & IFF_BROADCAST)){
1131
if(debug){
1132
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1133
if_entry->d_name);
1134
}
1135
return 0;
1136
}
1137
/* Reject non-ARP interfaces (including dummy interfaces) */
1138
if(ifr.ifr_flags & IFF_NOARP){
1139
if(debug){
1140
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1141
if_entry->d_name);
1142
}
1143
return 0;
1144
}
1145
/* Accept this device */
1146
if(debug){
1147
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1148
if_entry->d_name);
1149
}
1150
return 1;
1151
}
1152
1153
int notdotentries(const struct dirent *direntry){
1154
/* Skip "." and ".." */
1155
if(direntry->d_name[0] == '.'
1156
and (direntry->d_name[1] == '\0'
1157
or (direntry->d_name[1] == '.'
1158
and direntry->d_name[2] == '\0'))){
1159
return 0;
1160
}
1161
return 1;
1162
}
1163
1164
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1165
int ret;
1166
struct timespec now;
1167
struct timespec waited_time;
1168
intmax_t block_time;
1169
1170
while(true){
1171
if(mc.current_server == NULL){
1172
if (debug){
1173
fprintf(stderr,
1174
"Wait until first server is found. No timeout!\n");
1175
}
1176
ret = avahi_simple_poll_iterate(s, -1);
1177
} else {
1178
if (debug){
1179
fprintf(stderr, "Check current_server if we should run it,"
1180
" or wait\n");
1181
}
1182
/* the current time */
1183
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1184
if(ret == -1){
1185
perror_plus("clock_gettime");
1186
return -1;
1187
}
1188
/* Calculating in ms how long time between now and server
1189
who we visted longest time ago. Now - last seen. */
1190
waited_time.tv_sec = (now.tv_sec
1191
- mc.current_server->last_seen.tv_sec);
1192
waited_time.tv_nsec = (now.tv_nsec
1193
- mc.current_server->last_seen.tv_nsec);
1194
/* total time is 10s/10,000ms.
1195
Converting to s from ms by dividing by 1,000,
1196
and ns to ms by dividing by 1,000,000. */
1197
block_time = ((retry_interval
1198
- ((intmax_t)waited_time.tv_sec * 1000))
1199
- ((intmax_t)waited_time.tv_nsec / 1000000));
1200
1201
if (debug){
1202
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1203
}
1204
1205
if(block_time <= 0){
1206
ret = start_mandos_communication(mc.current_server->ip,
1207
mc.current_server->port,
1208
mc.current_server->if_index,
1209
mc.current_server->af);
1210
if(ret == 0){
1211
avahi_simple_poll_quit(mc.simple_poll);
1212
return 0;
1213
}
1214
ret = clock_gettime(CLOCK_MONOTONIC,
1215
&mc.current_server->last_seen);
1216
if(ret == -1){
1217
perror_plus("clock_gettime");
1218
return -1;
1219
}
1220
mc.current_server = mc.current_server->next;
1221
block_time = 0; /* Call avahi to find new Mandos
1222
servers, but don't block */
1223
}
1224
1225
ret = avahi_simple_poll_iterate(s, (int)block_time);
1226
}
1227
if(ret != 0){
1228
if (ret > 0 or errno != EINTR) {
1229
return (ret != 1) ? ret : 0;
1230
}
1231
}
1232
}
1233
}
742
/* Combines file name and path and returns the malloced new
743
string. some sane checks could/should be added */
744
static const char *combinepath(const char *first, const char *second){
745
size_t f_len = strlen(first);
746
size_t s_len = strlen(second);
747
char *tmp = malloc(f_len + s_len + 2);
748
if (tmp == NULL){
749
return NULL;
750
}
751
if(f_len > 0){
752
memcpy(tmp, first, f_len); /* Spurious warning */
753
}
754
tmp[f_len] = '/';
755
if(s_len > 0){
756
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
757
}
758
tmp[f_len + 1 + s_len] = '\0';
759
return tmp;
760
}
761
1234
762
1235
763
int main(int argc, char *argv[]){
1236
AvahiSServiceBrowser *sb = NULL;
1237
int error;
1238
int ret;
1239
intmax_t tmpmax;
1240
char *tmp;
1241
int exitcode = EXIT_SUCCESS;
1242
const char *interface = "";
1243
struct ifreq network;
1244
int sd = -1;
1245
bool take_down_interface = false;
1246
uid_t uid;
1247
gid_t gid;
1248
char tempdir[] = "/tmp/mandosXXXXXX";
1249
bool tempdir_created = false;
1250
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1251
const char *seckey = PATHDIR "/" SECKEY;
1252
const char *pubkey = PATHDIR "/" PUBKEY;
1253
1254
bool gnutls_initialized = false;
1255
bool gpgme_initialized = false;
1256
float delay = 2.5f;
1257
double retry_interval = 10; /* 10s between trying a server and
1258
retrying the same server again */
1259
1260
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1261
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1262
1263
uid = getuid();
1264
gid = getgid();
1265
1266
/* Lower any group privileges we might have, just to be safe */
1267
errno = 0;
1268
ret = setgid(gid);
1269
if(ret == -1){
1270
perror_plus("setgid");
1271
}
1272
1273
/* Lower user privileges (temporarily) */
1274
errno = 0;
1275
ret = seteuid(uid);
1276
if(ret == -1){
1277
perror_plus("seteuid");
1278
}
1279
1280
if(quit_now){
1281
goto end;
1282
}
1283
1284
{
1285
struct argp_option options[] = {
1286
{ .name = "debug", .key = 128,
1287
.doc = "Debug mode", .group = 3 },
1288
{ .name = "connect", .key = 'c',
1289
.arg = "ADDRESS:PORT",
1290
.doc = "Connect directly to a specific Mandos server",
1291
.group = 1 },
1292
{ .name = "interface", .key = 'i',
1293
.arg = "NAME",
1294
.doc = "Network interface that will be used to search for"
1295
" Mandos servers",
1296
.group = 1 },
1297
{ .name = "seckey", .key = 's',
1298
.arg = "FILE",
1299
.doc = "OpenPGP secret key file base name",
1300
.group = 1 },
1301
{ .name = "pubkey", .key = 'p',
1302
.arg = "FILE",
1303
.doc = "OpenPGP public key file base name",
1304
.group = 2 },
1305
{ .name = "dh-bits", .key = 129,
1306
.arg = "BITS",
1307
.doc = "Bit length of the prime number used in the"
1308
" Diffie-Hellman key exchange",
1309
.group = 2 },
1310
{ .name = "priority", .key = 130,
1311
.arg = "STRING",
1312
.doc = "GnuTLS priority string for the TLS handshake",
1313
.group = 1 },
1314
{ .name = "delay", .key = 131,
1315
.arg = "SECONDS",
1316
.doc = "Maximum delay to wait for interface startup",
1317
.group = 2 },
1318
{ .name = "retry", .key = 132,
1319
.arg = "SECONDS",
1320
.doc = "Retry interval used when denied by the mandos server",
1321
.group = 2 },
1322
/*
1323
* These reproduce what we would get without ARGP_NO_HELP
1324
*/
1325
{ .name = "help", .key = '?',
1326
.doc = "Give this help list", .group = -1 },
1327
{ .name = "usage", .key = -3,
1328
.doc = "Give a short usage message", .group = -1 },
1329
{ .name = "version", .key = 'V',
1330
.doc = "Print program version", .group = -1 },
1331
{ .name = NULL }
1332
};
1333
1334
error_t parse_opt(int key, char *arg,
1335
struct argp_state *state){
1336
errno = 0;
1337
switch(key){
1338
case 128: /* --debug */
1339
debug = true;
1340
break;
1341
case 'c': /* --connect */
1342
connect_to = arg;
1343
break;
1344
case 'i': /* --interface */
1345
interface = arg;
1346
break;
1347
case 's': /* --seckey */
1348
seckey = arg;
1349
break;
1350
case 'p': /* --pubkey */
1351
pubkey = arg;
1352
break;
1353
case 129: /* --dh-bits */
1354
errno = 0;
1355
tmpmax = strtoimax(arg, &tmp, 10);
1356
if(errno != 0 or tmp == arg or *tmp != '\0'
1357
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1358
argp_error(state, "Bad number of DH bits");
1359
}
1360
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1361
break;
1362
case 130: /* --priority */
1363
mc.priority = arg;
1364
break;
1365
case 131: /* --delay */
1366
errno = 0;
1367
delay = strtof(arg, &tmp);
1368
if(errno != 0 or tmp == arg or *tmp != '\0'){
1369
argp_error(state, "Bad delay");
1370
}
1371
case 132: /* --retry */
1372
errno = 0;
1373
retry_interval = strtod(arg, &tmp);
1374
if(errno != 0 or tmp == arg or *tmp != '\0'
1375
or (retry_interval * 1000) > INT_MAX
1376
or retry_interval < 0){
1377
argp_error(state, "Bad retry interval");
1378
}
1379
break;
1380
/*
1381
* These reproduce what we would get without ARGP_NO_HELP
1382
*/
1383
case '?': /* --help */
1384
argp_state_help(state, state->out_stream,
1385
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1386
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1387
case -3: /* --usage */
1388
argp_state_help(state, state->out_stream,
1389
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1390
case 'V': /* --version */
1391
fprintf(state->out_stream, "%s\n", argp_program_version);
1392
exit(argp_err_exit_status);
1393
break;
1394
default:
1395
return ARGP_ERR_UNKNOWN;
1396
}
1397
return errno;
1398
}
1399
1400
struct argp argp = { .options = options, .parser = parse_opt,
1401
.args_doc = "",
1402
.doc = "Mandos client -- Get and decrypt"
1403
" passwords from a Mandos server" };
1404
ret = argp_parse(&argp, argc, argv,
1405
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1406
switch(ret){
1407
case 0:
1408
break;
1409
case ENOMEM:
1410
default:
1411
errno = ret;
1412
perror_plus("argp_parse");
1413
exitcode = EX_OSERR;
1414
goto end;
1415
case EINVAL:
1416
exitcode = EX_USAGE;
1417
goto end;
1418
}
1419
}
1420
1421
{
1422
/* Work around Debian bug #633582:
1423
<http://bugs.debian.org/633582> */
1424
struct stat st;
1425
1426
/* Re-raise priviliges */
1427
errno = 0;
1428
ret = seteuid(0);
1429
if(ret == -1){
1430
perror_plus("seteuid");
1431
}
1432
1433
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1434
int seckey_fd = open(seckey, O_RDONLY);
1435
if(seckey_fd == -1){
1436
perror_plus("open");
1437
} else {
1438
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1439
if(ret == -1){
1440
perror_plus("fstat");
1441
} else {
1442
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1443
ret = fchown(seckey_fd, uid, gid);
1444
if(ret == -1){
1445
perror_plus("fchown");
1446
}
1447
}
1448
}
1449
TEMP_FAILURE_RETRY(close(seckey_fd));
1450
}
1451
}
1452
1453
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1454
int pubkey_fd = open(pubkey, O_RDONLY);
1455
if(pubkey_fd == -1){
1456
perror_plus("open");
1457
} else {
1458
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1459
if(ret == -1){
1460
perror_plus("fstat");
1461
} else {
1462
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1463
ret = fchown(pubkey_fd, uid, gid);
1464
if(ret == -1){
1465
perror_plus("fchown");
1466
}
1467
}
1468
}
1469
TEMP_FAILURE_RETRY(close(pubkey_fd));
1470
}
1471
}
1472
1473
/* Lower privileges */
1474
errno = 0;
1475
ret = seteuid(uid);
1476
if(ret == -1){
1477
perror_plus("seteuid");
1478
}
1479
}
1480
1481
if(not debug){
1482
avahi_set_log_function(empty_log);
1483
}
1484
1485
if(interface[0] == '\0'){
1486
struct dirent **direntries;
1487
ret = scandir(sys_class_net, &direntries, good_interface,
1488
alphasort);
1489
if(ret >= 1){
1490
/* Pick the first good interface */
1491
interface = strdup(direntries[0]->d_name);
1492
if(debug){
1493
fprintf(stderr, "Using interface \"%s\"\n", interface);
1494
}
1495
if(interface == NULL){
1496
perror_plus("malloc");
1497
free(direntries);
764
AvahiSServiceBrowser *sb = NULL;
765
int error;
766
int ret;
767
int exitcode = EXIT_SUCCESS;
768
const char *interface = "eth0";
769
struct ifreq network;
770
int sd;
771
uid_t uid;
772
gid_t gid;
773
char *connect_to = NULL;
774
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
775
const char *pubkeyfile = "pubkey.txt";
776
const char *seckeyfile = "seckey.txt";
777
mandos_context mc = { .simple_poll = NULL, .server = NULL,
778
.dh_bits = 1024, .priority = "SECURE256"};
779
bool gnutls_initalized = false;
780
781
{
782
struct argp_option options[] = {
783
{ .name = "debug", .key = 128,
784
.doc = "Debug mode", .group = 3 },
785
{ .name = "connect", .key = 'c',
786
.arg = "IP",
787
.doc = "Connect directly to a sepcified mandos server",
788
.group = 1 },
789
{ .name = "interface", .key = 'i',
790
.arg = "INTERFACE",
791
.doc = "Interface that Avahi will conntect through",
792
.group = 1 },
793
{ .name = "keydir", .key = 'd',
794
.arg = "KEYDIR",
795
.doc = "Directory where the openpgp keyring is",
796
.group = 1 },
797
{ .name = "seckey", .key = 's',
798
.arg = "SECKEY",
799
.doc = "Secret openpgp key for gnutls authentication",
800
.group = 1 },
801
{ .name = "pubkey", .key = 'p',
802
.arg = "PUBKEY",
803
.doc = "Public openpgp key for gnutls authentication",
804
.group = 2 },
805
{ .name = "dh-bits", .key = 129,
806
.arg = "BITS",
807
.doc = "dh-bits to use in gnutls communication",
808
.group = 2 },
809
{ .name = "priority", .key = 130,
810
.arg = "PRIORITY",
811
.doc = "GNUTLS priority", .group = 1 },
812
{ .name = NULL }
813
};
814
815
816
error_t parse_opt (int key, char *arg,
817
struct argp_state *state) {
818
/* Get the INPUT argument from `argp_parse', which we know is
819
a pointer to our plugin list pointer. */
820
switch (key) {
821
case 128:
822
debug = true;
823
break;
824
case 'c':
825
connect_to = arg;
826
break;
827
case 'i':
828
interface = arg;
829
break;
830
case 'd':
831
keydir = arg;
832
break;
833
case 's':
834
seckeyfile = arg;
835
break;
836
case 'p':
837
pubkeyfile = arg;
838
break;
839
case 129:
840
errno = 0;
841
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
842
if (errno){
843
perror("strtol");
844
exit(EXIT_FAILURE);
845
}
846
break;
847
case 130:
848
mc.priority = arg;
849
break;
850
case ARGP_KEY_ARG:
851
argp_usage (state);
852
break;
853
case ARGP_KEY_END:
854
break;
855
default:
856
return ARGP_ERR_UNKNOWN;
857
}
858
return 0;
859
}
860
861
struct argp argp = { .options = options, .parser = parse_opt,
862
.args_doc = "",
863
.doc = "Mandos client -- Get and decrypt"
864
" passwords from mandos server" };
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
867
fprintf(stderr, "Unkown error while parsing arguments\n");
1498
868
exitcode = EXIT_FAILURE;
1499
869
goto end;
1500
870
}
1501
free(direntries);
1502
} else {
1503
free(direntries);
1504
fprintf(stderr, "Could not find a network interface\n");
871
}
872
873
pubkeyfile = combinepath(keydir, pubkeyfile);
874
if (pubkeyfile == NULL){
875
perror("combinepath");
1505
876
exitcode = EXIT_FAILURE;
1506
877
goto end;
1507
878
}
1508
}
1509
1510
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1511
from the signal handler */
1512
/* Initialize the pseudo-RNG for Avahi */
1513
srand((unsigned int) time(NULL));
1514
mc.simple_poll = avahi_simple_poll_new();
1515
if(mc.simple_poll == NULL){
1516
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1517
exitcode = EX_UNAVAILABLE;
1518
goto end;
1519
}
1520
1521
sigemptyset(&sigterm_action.sa_mask);
1522
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1523
if(ret == -1){
1524
perror_plus("sigaddset");
1525
exitcode = EX_OSERR;
1526
goto end;
1527
}
1528
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1529
if(ret == -1){
1530
perror_plus("sigaddset");
1531
exitcode = EX_OSERR;
1532
goto end;
1533
}
1534
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1535
if(ret == -1){
1536
perror_plus("sigaddset");
1537
exitcode = EX_OSERR;
1538
goto end;
1539
}
1540
/* Need to check if the handler is SIG_IGN before handling:
1541
| [[info:libc:Initial Signal Actions]] |
1542
| [[info:libc:Basic Signal Handling]] |
1543
*/
1544
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1545
if(ret == -1){
1546
perror_plus("sigaction");
1547
return EX_OSERR;
1548
}
1549
if(old_sigterm_action.sa_handler != SIG_IGN){
1550
ret = sigaction(SIGINT, &sigterm_action, NULL);
1551
if(ret == -1){
1552
perror_plus("sigaction");
1553
exitcode = EX_OSERR;
1554
goto end;
1555
}
1556
}
1557
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1558
if(ret == -1){
1559
perror_plus("sigaction");
1560
return EX_OSERR;
1561
}
1562
if(old_sigterm_action.sa_handler != SIG_IGN){
1563
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1564
if(ret == -1){
1565
perror_plus("sigaction");
1566
exitcode = EX_OSERR;
1567
goto end;
1568
}
1569
}
1570
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1571
if(ret == -1){
1572
perror_plus("sigaction");
1573
return EX_OSERR;
1574
}
1575
if(old_sigterm_action.sa_handler != SIG_IGN){
1576
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1577
if(ret == -1){
1578
perror_plus("sigaction");
1579
exitcode = EX_OSERR;
1580
goto end;
1581
}
1582
}
1583
1584
/* If the interface is down, bring it up */
1585
if(strcmp(interface, "none") != 0){
879
880
seckeyfile = combinepath(keydir, seckeyfile);
881
if (seckeyfile == NULL){
882
perror("combinepath");
883
goto end;
884
}
885
886
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
887
if (ret == -1){
888
fprintf(stderr, "init_gnutls_global\n");
889
goto end;
890
} else {
891
gnutls_initalized = true;
892
}
893
894
uid = getuid();
895
gid = getgid();
896
897
ret = setuid(uid);
898
if (ret == -1){
899
perror("setuid");
900
}
901
902
setgid(gid);
903
if (ret == -1){
904
perror("setgid");
905
}
906
1586
907
if_index = (AvahiIfIndex) if_nametoindex(interface);
1587
908
if(if_index == 0){
1588
909
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1589
exitcode = EX_UNAVAILABLE;
1590
goto end;
1591
}
1592
1593
if(quit_now){
1594
goto end;
1595
}
1596
1597
/* Re-raise priviliges */
1598
errno = 0;
1599
ret = seteuid(0);
1600
if(ret == -1){
1601
perror_plus("seteuid");
1602
}
1603
1604
#ifdef __linux__
1605
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1606
messages about the network interface to mess up the prompt */
1607
ret = klogctl(8, NULL, 5);
1608
bool restore_loglevel = true;
1609
if(ret == -1){
1610
restore_loglevel = false;
1611
perror_plus("klogctl");
1612
}
1613
#endif /* __linux__ */
1614
1615
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1616
if(sd < 0){
1617
perror_plus("socket");
1618
exitcode = EX_OSERR;
1619
#ifdef __linux__
1620
if(restore_loglevel){
1621
ret = klogctl(7, NULL, 0);
1622
if(ret == -1){
1623
perror_plus("klogctl");
1624
}
1625
}
1626
#endif /* __linux__ */
1627
/* Lower privileges */
1628
errno = 0;
1629
ret = seteuid(uid);
1630
if(ret == -1){
1631
perror_plus("seteuid");
1632
}
1633
goto end;
1634
}
1635
strcpy(network.ifr_name, interface);
1636
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1637
if(ret == -1){
1638
perror_plus("ioctl SIOCGIFFLAGS");
1639
#ifdef __linux__
1640
if(restore_loglevel){
1641
ret = klogctl(7, NULL, 0);
1642
if(ret == -1){
1643
perror_plus("klogctl");
1644
}
1645
}
1646
#endif /* __linux__ */
1647
exitcode = EX_OSERR;
1648
/* Lower privileges */
1649
errno = 0;
1650
ret = seteuid(uid);
1651
if(ret == -1){
1652
perror_plus("seteuid");
1653
}
1654
goto end;
1655
}
1656
if((network.ifr_flags & IFF_UP) == 0){
1657
network.ifr_flags |= IFF_UP;
1658
take_down_interface = true;
1659
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1660
if(ret == -1){
1661
take_down_interface = false;
1662
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1663
exitcode = EX_OSERR;
1664
#ifdef __linux__
1665
if(restore_loglevel){
1666
ret = klogctl(7, NULL, 0);
1667
if(ret == -1){
1668
perror_plus("klogctl");
1669
}
1670
}
1671
#endif /* __linux__ */
1672
/* Lower privileges */
1673
errno = 0;
1674
ret = seteuid(uid);
1675
if(ret == -1){
1676
perror_plus("seteuid");
1677
}
1678
goto end;
1679
}
1680
}
1681
/* Sleep checking until interface is running.
1682
Check every 0.25s, up to total time of delay */
1683
for(int i=0; i < delay * 4; i++){
910
exit(EXIT_FAILURE);
911
}
912
913
if(connect_to != NULL){
914
/* Connect directly, do not use Zeroconf */
915
/* (Mainly meant for debugging) */
916
char *address = strrchr(connect_to, ':');
917
if(address == NULL){
918
fprintf(stderr, "No colon in address\n");
919
exitcode = EXIT_FAILURE;
920
goto end;
921
}
922
errno = 0;
923
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
924
if(errno){
925
perror("Bad port number");
926
exitcode = EXIT_FAILURE;
927
goto end;
928
}
929
*address = '\0';
930
address = connect_to;
931
ret = start_mandos_communication(address, port, if_index, &mc);
932
if(ret < 0){
933
exitcode = EXIT_FAILURE;
934
} else {
935
exitcode = EXIT_SUCCESS;
936
}
937
goto end;
938
}
939
940
/* If the interface is down, bring it up */
941
{
942
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
943
if(sd < 0) {
944
perror("socket");
945
exitcode = EXIT_FAILURE;
946
goto end;
947
}
948
strcpy(network.ifr_name, interface); /* Spurious warning */
1684
949
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1685
950
if(ret == -1){
1686
perror_plus("ioctl SIOCGIFFLAGS");
1687
} else if(network.ifr_flags & IFF_RUNNING){
1688
break;
1689
}
1690
struct timespec sleeptime = { .tv_nsec = 250000000 };
1691
ret = nanosleep(&sleeptime, NULL);
1692
if(ret == -1 and errno != EINTR){
1693
perror_plus("nanosleep");
1694
}
1695
}
1696
if(not take_down_interface){
1697
/* We won't need the socket anymore */
1698
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1699
if(ret == -1){
1700
perror_plus("close");
1701
}
1702
}
1703
#ifdef __linux__
1704
if(restore_loglevel){
1705
/* Restores kernel loglevel to default */
1706
ret = klogctl(7, NULL, 0);
1707
if(ret == -1){
1708
perror_plus("klogctl");
1709
}
1710
}
1711
#endif /* __linux__ */
1712
/* Lower privileges */
1713
errno = 0;
1714
if(take_down_interface){
1715
/* Lower privileges */
1716
ret = seteuid(uid);
1717
if(ret == -1){
1718
perror_plus("seteuid");
1719
}
1720
} else {
1721
/* Lower privileges permanently */
1722
ret = setuid(uid);
1723
if(ret == -1){
1724
perror_plus("setuid");
1725
}
1726
}
1727
}
1728
1729
if(quit_now){
1730
goto end;
1731
}
1732
1733
ret = init_gnutls_global(pubkey, seckey);
1734
if(ret == -1){
1735
fprintf(stderr, "init_gnutls_global failed\n");
1736
exitcode = EX_UNAVAILABLE;
1737
goto end;
1738
} else {
1739
gnutls_initialized = true;
1740
}
1741
1742
if(quit_now){
1743
goto end;
1744
}
1745
1746
if(mkdtemp(tempdir) == NULL){
1747
perror_plus("mkdtemp");
1748
goto end;
1749
}
1750
tempdir_created = true;
1751
1752
if(quit_now){
1753
goto end;
1754
}
1755
1756
if(not init_gpgme(pubkey, seckey, tempdir)){
1757
fprintf(stderr, "init_gpgme failed\n");
1758
exitcode = EX_UNAVAILABLE;
1759
goto end;
1760
} else {
1761
gpgme_initialized = true;
1762
}
1763
1764
if(quit_now){
1765
goto end;
1766
}
1767
1768
if(connect_to != NULL){
1769
/* Connect directly, do not use Zeroconf */
1770
/* (Mainly meant for debugging) */
1771
char *address = strrchr(connect_to, ':');
1772
if(address == NULL){
1773
fprintf(stderr, "No colon in address\n");
1774
exitcode = EX_USAGE;
1775
goto end;
1776
}
1777
1778
if(quit_now){
1779
goto end;
1780
}
1781
1782
uint16_t port;
1783
errno = 0;
1784
tmpmax = strtoimax(address+1, &tmp, 10);
1785
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1786
or tmpmax != (uint16_t)tmpmax){
1787
fprintf(stderr, "Bad port number\n");
1788
exitcode = EX_USAGE;
1789
goto end;
1790
}
1791
1792
if(quit_now){
1793
goto end;
1794
}
1795
1796
port = (uint16_t)tmpmax;
1797
*address = '\0';
1798
/* Colon in address indicates IPv6 */
1799
int af;
1800
if(strchr(connect_to, ':') != NULL){
1801
af = AF_INET6;
1802
/* Accept [] around IPv6 address - see RFC 5952 */
1803
if(connect_to[0] == '[' and address[-1] == ']')
1804
{
1805
connect_to++;
1806
address[-1] = '\0';
951
perror("ioctl SIOCGIFFLAGS");
952
exitcode = EXIT_FAILURE;
953
goto end;
954
}
955
if((network.ifr_flags & IFF_UP) == 0){
956
network.ifr_flags |= IFF_UP;
957
ret = ioctl(sd, SIOCSIFFLAGS, &network);
958
if(ret == -1){
959
perror("ioctl SIOCSIFFLAGS");
960
exitcode = EXIT_FAILURE;
961
goto end;
1807
962
}
1808
} else {
1809
af = AF_INET;
1810
}
1811
address = connect_to;
1812
1813
if(quit_now){
1814
goto end;
1815
}
1816
1817
while(not quit_now){
1818
ret = start_mandos_communication(address, port, if_index, af);
1819
if(quit_now or ret == 0){
1820
break;
1821
}
1822
if(debug){
1823
fprintf(stderr, "Retrying in %d seconds\n",
1824
(int)retry_interval);
1825
}
1826
sleep((int)retry_interval);
1827
}
1828
1829
if (not quit_now){
1830
exitcode = EXIT_SUCCESS;
1831
}
1832
1833
goto end;
1834
}
1835
1836
if(quit_now){
1837
goto end;
1838
}
1839
1840
{
1841
AvahiServerConfig config;
1842
/* Do not publish any local Zeroconf records */
1843
avahi_server_config_init(&config);
1844
config.publish_hinfo = 0;
1845
config.publish_addresses = 0;
1846
config.publish_workstation = 0;
1847
config.publish_domain = 0;
1848
1849
/* Allocate a new server */
1850
mc.server = avahi_server_new(avahi_simple_poll_get
1851
(mc.simple_poll), &config, NULL,
1852
NULL, &error);
1853
1854
/* Free the Avahi configuration data */
1855
avahi_server_config_free(&config);
1856
}
1857
1858
/* Check if creating the Avahi server object succeeded */
1859
if(mc.server == NULL){
1860
fprintf(stderr, "Failed to create Avahi server: %s\n",
1861
avahi_strerror(error));
1862
exitcode = EX_UNAVAILABLE;
1863
goto end;
1864
}
1865
1866
if(quit_now){
1867
goto end;
1868
}
1869
1870
/* Create the Avahi service browser */
1871
sb = avahi_s_service_browser_new(mc.server, if_index,
1872
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1873
NULL, 0, browse_callback, NULL);
1874
if(sb == NULL){
1875
fprintf(stderr, "Failed to create service browser: %s\n",
1876
avahi_strerror(avahi_server_errno(mc.server)));
1877
exitcode = EX_UNAVAILABLE;
1878
goto end;
1879
}
1880
1881
if(quit_now){
1882
goto end;
1883
}
1884
1885
/* Run the main loop */
1886
1887
if(debug){
1888
fprintf(stderr, "Starting Avahi loop search\n");
1889
}
1890
1891
ret = avahi_loop_with_timeout(mc.simple_poll,
1892
(int)(retry_interval * 1000));
1893
if(debug){
1894
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1895
(ret == 0) ? "successfully" : "with error");
1896
}
1897
963
}
964
close(sd);
965
}
966
967
if (not debug){
968
avahi_set_log_function(empty_log);
969
}
970
971
/* Initialize the pseudo-RNG for Avahi */
972
srand((unsigned int) time(NULL));
973
974
/* Allocate main Avahi loop object */
975
mc.simple_poll = avahi_simple_poll_new();
976
if (mc.simple_poll == NULL) {
977
fprintf(stderr, "Avahi: Failed to create simple poll"
978
" object.\n");
979
exitcode = EXIT_FAILURE;
980
goto end;
981
}
982
983
{
984
AvahiServerConfig config;
985
/* Do not publish any local Zeroconf records */
986
avahi_server_config_init(&config);
987
config.publish_hinfo = 0;
988
config.publish_addresses = 0;
989
config.publish_workstation = 0;
990
config.publish_domain = 0;
991
992
/* Allocate a new server */
993
mc.server = avahi_server_new(avahi_simple_poll_get
994
(mc.simple_poll), &config, NULL,
995
NULL, &error);
996
997
/* Free the Avahi configuration data */
998
avahi_server_config_free(&config);
999
}
1000
1001
/* Check if creating the Avahi server object succeeded */
1002
if (mc.server == NULL) {
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1004
avahi_strerror(error));
1005
exitcode = EXIT_FAILURE;
1006
goto end;
1007
}
1008
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
1011
AVAHI_PROTO_INET6,
1012
"_mandos._tcp", NULL, 0,
1013
browse_callback, &mc);
1014
if (sb == NULL) {
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1018
goto end;
1019
}
1020
1021
/* Run the main loop */
1022
1023
if (debug){
1024
fprintf(stderr, "Starting Avahi loop search\n");
1025
}
1026
1027
avahi_simple_poll_loop(mc.simple_poll);
1028
1898
1029
end:
1899
1900
if(debug){
1901
fprintf(stderr, "%s exiting\n", argv[0]);
1902
}
1903
1904
/* Cleanup things */
1905
if(sb != NULL)
1906
avahi_s_service_browser_free(sb);
1907
1908
if(mc.server != NULL)
1909
avahi_server_free(mc.server);
1910
1911
if(mc.simple_poll != NULL)
1912
avahi_simple_poll_free(mc.simple_poll);
1913
1914
if(gnutls_initialized){
1915
gnutls_certificate_free_credentials(mc.cred);
1916
gnutls_global_deinit();
1917
gnutls_dh_params_deinit(mc.dh_params);
1918
}
1919
1920
if(gpgme_initialized){
1921
gpgme_release(mc.ctx);
1922
}
1923
1924
/* Cleans up the circular linked list of Mandos servers the client
1925
has seen */
1926
if(mc.current_server != NULL){
1927
mc.current_server->prev->next = NULL;
1928
while(mc.current_server != NULL){
1929
server *next = mc.current_server->next;
1930
free(mc.current_server);
1931
mc.current_server = next;
1932
}
1933
}
1934
1935
/* Take down the network interface */
1936
if(take_down_interface){
1937
/* Re-raise priviliges */
1938
errno = 0;
1939
ret = seteuid(0);
1940
if(ret == -1){
1941
perror_plus("seteuid");
1942
}
1943
if(geteuid() == 0){
1944
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1945
if(ret == -1){
1946
perror_plus("ioctl SIOCGIFFLAGS");
1947
} else if(network.ifr_flags & IFF_UP) {
1948
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1949
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1950
if(ret == -1){
1951
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1952
}
1953
}
1954
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1955
if(ret == -1){
1956
perror_plus("close");
1957
}
1958
/* Lower privileges permanently */
1959
errno = 0;
1960
ret = setuid(uid);
1961
if(ret == -1){
1962
perror_plus("setuid");
1963
}
1964
}
1965
}
1966
1967
/* Removes the GPGME temp directory and all files inside */
1968
if(tempdir_created){
1969
struct dirent **direntries = NULL;
1970
struct dirent *direntry = NULL;
1971
int numentries = scandir(tempdir, &direntries, notdotentries,
1972
alphasort);
1973
if (numentries > 0){
1974
for(int i = 0; i < numentries; i++){
1975
direntry = direntries[i];
1976
char *fullname = NULL;
1977
ret = asprintf(&fullname, "%s/%s", tempdir,
1978
direntry->d_name);
1979
if(ret < 0){
1980
perror_plus("asprintf");
1981
continue;
1982
}
1983
ret = remove(fullname);
1984
if(ret == -1){
1985
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1986
strerror(errno));
1987
}
1988
free(fullname);
1989
}
1990
}
1991
1992
/* need to clean even if 0 because man page doesn't specify */
1993
free(direntries);
1994
if (numentries == -1){
1995
perror_plus("scandir");
1996
}
1997
ret = rmdir(tempdir);
1998
if(ret == -1 and errno != ENOENT){
1999
perror_plus("rmdir");
2000
}
2001
}
2002
2003
if(quit_now){
2004
sigemptyset(&old_sigterm_action.sa_mask);
2005
old_sigterm_action.sa_handler = SIG_DFL;
2006
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2007
&old_sigterm_action,
2008
NULL));
2009
if(ret == -1){
2010
perror_plus("sigaction");
2011
}
2012
do {
2013
ret = raise(signal_received);
2014
} while(ret != 0 and errno == EINTR);
2015
if(ret != 0){
2016
perror_plus("raise");
2017
abort();
2018
}
2019
TEMP_FAILURE_RETRY(pause());
2020
}
2021
2022
return exitcode;
1030
1031
if (debug){
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1033
}
1034
1035
/* Cleanup things */
1036
if (sb != NULL)
1037
avahi_s_service_browser_free(sb);
1038
1039
if (mc.server != NULL)
1040
avahi_server_free(mc.server);
1041
1042
if (mc.simple_poll != NULL)
1043
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfile);
1045
free(seckeyfile);
1046
1047
if (gnutls_initalized){
1048
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
1050
}
1051
1052
return exitcode;
2023
1053
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0