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- Committer: Björn Påhlsson
- Date: 2011-11-14 18:03:35 UTC
- mto: (237.16.9 client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 290.
- Revision ID: belorn@fukt.bsnet.se-20111114180335-3j4x5mjr7lix2jyj
New convinence error printer: fprintf_plus
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files removed:
- etc-plugins.d-README
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
25
26
* along with this program. If not, see
26
27
* <http://www.gnu.org/licenses/>.
27
28
*
28
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
38
#endif
34
39
35
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
41
37
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
43
stdout, ferror(), remove() */
39
44
#include <stdint.h> /* uint16_t, uint32_t */
40
45
#include <stddef.h> /* NULL, size_t, ssize_t */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
44
49
#include <string.h> /* memset(), strcmp(), strlen(),
45
50
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
47
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
53
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
51
56
#include <sys/stat.h> /* open() */
52
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
58
inet_pton(), connect() */
55
59
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
58
64
#include <assert.h> /* assert() */
59
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
61
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
62
69
SIOCSIFFLAGS, if_indextoname(),
63
70
if_nametoindex(), IF_NAMESIZE */
64
#include <netinet/in.h>
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
65
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
66
getuid(), getgid(), setuid(),
67
setgid() */
68
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
70
79
#include <argp.h> /* struct argp_option, error_t, struct
71
80
argp_state, struct argp,
72
81
argp_parse(), ARGP_KEY_ARG,
73
82
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__ */
74
92
75
93
/* Avahi */
76
94
/* All Avahi types, constants and functions
89
107
gnutls_*
90
108
init_gnutls_session(),
91
109
GNUTLS_* */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
110
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
93
112
GNUTLS_OPENPGP_FMT_BASE64 */
94
113
95
114
/* GPGME */
101
120
102
121
#define BUFFER_SIZE 256
103
122
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
108
123
#define PATHDIR "/conf/conf.d/mandos"
109
124
#define SECKEY "seckey.txt"
110
125
#define PUBKEY "pubkey.txt"
126
#define HOOKDIR "/lib/mandos/network-hooks.d"
111
127
112
128
bool debug = false;
113
129
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "mandos-client 1.0";
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
130
const char *argp_program_version = "mandos-client " VERSION;
131
const char *argp_program_bug_address = "<mandos@recompile.se>";
132
static const char sys_class_net[] = "/sys/class/net";
133
char *connect_to = NULL;
134
135
/* Doubly linked list that need to be circularly linked when used */
136
typedef struct server{
137
const char *ip;
138
uint16_t port;
139
AvahiIfIndex if_index;
140
int af;
141
struct timespec last_seen;
142
struct server *next;
143
struct server *prev;
144
} server;
116
145
117
146
/* Used for passing in values through the Avahi callback functions */
118
147
typedef struct {
123
152
gnutls_dh_params_t dh_params;
124
153
const char *priority;
125
154
gpgme_ctx_t ctx;
155
server *current_server;
126
156
} mandos_context;
127
157
158
/* global context so signal handler can reach it*/
159
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
163
164
sig_atomic_t quit_now = 0;
165
int signal_received = 0;
166
167
/* Function to use when printing errors */
168
void perror_plus(const char *print_text){
169
fprintf(stderr, "Mandos plugin %s: ",
170
program_invocation_short_name);
171
perror(print_text);
172
}
173
174
int fprintf_plus(FILE *stream, const char *format, ...){
175
va_list ap;
176
va_start (ap, format);
177
178
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
179
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
180
}
181
128
182
/*
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
183
* Make additional room in "buffer" for at least BUFFER_SIZE more
184
* bytes. "buffer_capacity" is how much is currently allocated,
131
185
* "buffer_length" is how much is already used.
132
186
*/
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
187
size_t incbuffer(char **buffer, size_t buffer_length,
134
188
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
189
if(buffer_length + BUFFER_SIZE > buffer_capacity){
136
190
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if (buffer == NULL){
191
if(buffer == NULL){
138
192
return 0;
139
193
}
140
194
buffer_capacity += BUFFER_SIZE;
142
196
return buffer_capacity;
143
197
}
144
198
199
/* Add server to set of servers to retry periodically */
200
int add_server(const char *ip, uint16_t port,
201
AvahiIfIndex if_index,
202
int af){
203
int ret;
204
server *new_server = malloc(sizeof(server));
205
if(new_server == NULL){
206
perror_plus("malloc");
207
return -1;
208
}
209
*new_server = (server){ .ip = strdup(ip),
210
.port = port,
211
.if_index = if_index,
212
.af = af };
213
if(new_server->ip == NULL){
214
perror_plus("strdup");
215
return -1;
216
}
217
/* Special case of first server */
218
if (mc.current_server == NULL){
219
new_server->next = new_server;
220
new_server->prev = new_server;
221
mc.current_server = new_server;
222
/* Place the new server last in the list */
223
} else {
224
new_server->next = mc.current_server;
225
new_server->prev = mc.current_server->prev;
226
new_server->prev->next = new_server;
227
mc.current_server->prev = new_server;
228
}
229
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
230
if(ret == -1){
231
perror_plus("clock_gettime");
232
return -1;
233
}
234
return 0;
235
}
236
145
237
/*
146
238
* Initialize GPGME.
147
239
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
240
static bool init_gpgme(const char *seckey,
149
241
const char *pubkey, const char *tempdir){
150
int ret;
151
242
gpgme_error_t rc;
152
243
gpgme_engine_info_t engine_info;
153
244
154
245
155
246
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
247
* Helper function to insert pub and seckey to the engine keyring.
157
248
*/
158
249
bool import_key(const char *filename){
250
int ret;
159
251
int fd;
160
252
gpgme_data_t pgp_data;
161
253
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
254
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
255
if(fd == -1){
164
perror("open");
256
perror_plus("open");
165
257
return false;
166
258
}
167
259
168
260
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
if (rc != GPG_ERR_NO_ERROR){
261
if(rc != GPG_ERR_NO_ERROR){
170
262
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
263
gpgme_strsource(rc), gpgme_strerror(rc));
172
264
return false;
173
265
}
174
266
175
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if (rc != GPG_ERR_NO_ERROR){
267
rc = gpgme_op_import(mc.ctx, pgp_data);
268
if(rc != GPG_ERR_NO_ERROR){
177
269
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
270
gpgme_strsource(rc), gpgme_strerror(rc));
179
271
return false;
180
272
}
181
273
182
ret = TEMP_FAILURE_RETRY(close(fd));
274
ret = (int)TEMP_FAILURE_RETRY(close(fd));
183
275
if(ret == -1){
184
perror("close");
276
perror_plus("close");
185
277
}
186
278
gpgme_data_release(pgp_data);
187
279
return true;
188
280
}
189
281
190
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
282
if(debug){
283
fprintf(stderr, "Initializing GPGME\n");
192
284
}
193
285
194
286
/* Init GPGME */
195
287
gpgme_check_version(NULL);
196
288
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
if (rc != GPG_ERR_NO_ERROR){
289
if(rc != GPG_ERR_NO_ERROR){
198
290
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
291
gpgme_strsource(rc), gpgme_strerror(rc));
200
292
return false;
201
293
}
202
294
203
/* Set GPGME home directory for the OpenPGP engine only */
204
rc = gpgme_get_engine_info (&engine_info);
205
if (rc != GPG_ERR_NO_ERROR){
295
/* Set GPGME home directory for the OpenPGP engine only */
296
rc = gpgme_get_engine_info(&engine_info);
297
if(rc != GPG_ERR_NO_ERROR){
206
298
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
299
gpgme_strsource(rc), gpgme_strerror(rc));
208
300
return false;
221
313
}
222
314
223
315
/* Create new GPGME "context" */
224
rc = gpgme_new(&(mc->ctx));
225
if (rc != GPG_ERR_NO_ERROR){
316
rc = gpgme_new(&(mc.ctx));
317
if(rc != GPG_ERR_NO_ERROR){
226
318
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
319
gpgme_strsource(rc), gpgme_strerror(rc));
228
320
return false;
229
321
}
230
322
231
if (not import_key(pubkey) or not import_key(seckey)){
323
if(not import_key(pubkey) or not import_key(seckey)){
232
324
return false;
233
325
}
234
326
235
return true;
327
return true;
236
328
}
237
329
238
330
/*
239
331
* Decrypt OpenPGP data.
240
332
* Returns -1 on error
241
333
*/
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
334
static ssize_t pgp_packet_decrypt(const char *cryptotext,
335
size_t crypto_size,
336
char **plaintext){
246
337
gpgme_data_t dh_crypto, dh_plain;
247
338
gpgme_error_t rc;
248
339
ssize_t ret;
249
340
size_t plaintext_capacity = 0;
250
341
ssize_t plaintext_length = 0;
251
342
252
if (debug){
343
if(debug){
253
344
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
254
345
}
255
346
256
347
/* Create new GPGME data buffer from memory cryptotext */
257
348
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
349
0);
259
if (rc != GPG_ERR_NO_ERROR){
350
if(rc != GPG_ERR_NO_ERROR){
260
351
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
352
gpgme_strsource(rc), gpgme_strerror(rc));
262
353
return -1;
264
355
265
356
/* Create new empty GPGME data buffer for the plaintext */
266
357
rc = gpgme_data_new(&dh_plain);
267
if (rc != GPG_ERR_NO_ERROR){
358
if(rc != GPG_ERR_NO_ERROR){
268
359
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
360
gpgme_strsource(rc), gpgme_strerror(rc));
270
361
gpgme_data_release(dh_crypto);
273
364
274
365
/* Decrypt data from the cryptotext data buffer to the plaintext
275
366
data buffer */
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if (rc != GPG_ERR_NO_ERROR){
367
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
368
if(rc != GPG_ERR_NO_ERROR){
278
369
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
370
gpgme_strsource(rc), gpgme_strerror(rc));
280
371
plaintext_length = -1;
281
if (debug){
372
if(debug){
282
373
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if (result == NULL){
374
result = gpgme_op_decrypt_result(mc.ctx);
375
if(result == NULL){
285
376
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
377
} else {
287
378
fprintf(stderr, "Unsupported algorithm: %s\n",
293
384
}
294
385
gpgme_recipient_t recipient;
295
386
recipient = result->recipients;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
387
while(recipient != NULL){
388
fprintf(stderr, "Public key algorithm: %s\n",
389
gpgme_pubkey_algo_name(recipient->pubkey_algo));
390
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
391
fprintf(stderr, "Secret key available: %s\n",
392
recipient->status == GPG_ERR_NO_SECKEY
393
? "No" : "Yes");
394
recipient = recipient->next;
306
395
}
307
396
}
308
397
}
314
403
}
315
404
316
405
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
318
perror("gpgme_data_seek");
406
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
407
perror_plus("gpgme_data_seek");
319
408
plaintext_length = -1;
320
409
goto decrypt_end;
321
410
}
322
411
323
412
*plaintext = NULL;
324
413
while(true){
325
plaintext_capacity = adjustbuffer(plaintext,
414
plaintext_capacity = incbuffer(plaintext,
326
415
(size_t)plaintext_length,
327
416
plaintext_capacity);
328
if (plaintext_capacity == 0){
329
perror("adjustbuffer");
417
if(plaintext_capacity == 0){
418
perror_plus("incbuffer");
330
419
plaintext_length = -1;
331
420
goto decrypt_end;
332
421
}
334
423
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
335
424
BUFFER_SIZE);
336
425
/* Print the data, if any */
337
if (ret == 0){
426
if(ret == 0){
338
427
/* EOF */
339
428
break;
340
429
}
341
430
if(ret < 0){
342
perror("gpgme_data_read");
431
perror_plus("gpgme_data_read");
343
432
plaintext_length = -1;
344
433
goto decrypt_end;
345
434
}
364
453
return plaintext_length;
365
454
}
366
455
367
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
369
if (ret == NULL)
456
static const char * safer_gnutls_strerror(int value){
457
const char *ret = gnutls_strerror(value); /* Spurious warning from
458
-Wunreachable-code */
459
if(ret == NULL)
370
460
ret = "(unknown)";
371
461
return ret;
372
462
}
377
467
fprintf(stderr, "GnuTLS: %s", string);
378
468
}
379
469
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
470
static int init_gnutls_global(const char *pubkeyfilename,
382
471
const char *seckeyfilename){
383
472
int ret;
384
473
387
476
}
388
477
389
478
ret = gnutls_global_init();
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
479
if(ret != GNUTLS_E_SUCCESS){
480
fprintf(stderr, "GnuTLS global_init: %s\n",
481
safer_gnutls_strerror(ret));
393
482
return -1;
394
483
}
395
484
396
if (debug){
485
if(debug){
397
486
/* "Use a log level over 10 to enable all debugging options."
398
487
* - GnuTLS manual
399
488
*/
402
491
}
403
492
404
493
/* OpenPGP credentials */
405
gnutls_certificate_allocate_credentials(&mc->cred);
406
if (ret != GNUTLS_E_SUCCESS){
407
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
408
warning */
409
safer_gnutls_strerror(ret));
410
gnutls_global_deinit ();
494
ret = gnutls_certificate_allocate_credentials(&mc.cred);
495
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "GnuTLS memory error: %s\n",
497
safer_gnutls_strerror(ret));
498
gnutls_global_deinit();
411
499
return -1;
412
500
}
413
501
418
506
}
419
507
420
508
ret = gnutls_certificate_set_openpgp_key_file
421
(mc->cred, pubkeyfilename, seckeyfilename,
509
(mc.cred, pubkeyfilename, seckeyfilename,
422
510
GNUTLS_OPENPGP_FMT_BASE64);
423
if (ret != GNUTLS_E_SUCCESS) {
511
if(ret != GNUTLS_E_SUCCESS){
424
512
fprintf(stderr,
425
513
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
514
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
430
518
}
431
519
432
520
/* GnuTLS server initialization */
433
ret = gnutls_dh_params_init(&mc->dh_params);
434
if (ret != GNUTLS_E_SUCCESS) {
435
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
436
" %s\n", safer_gnutls_strerror(ret));
521
ret = gnutls_dh_params_init(&mc.dh_params);
522
if(ret != GNUTLS_E_SUCCESS){
523
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
524
" %s\n", safer_gnutls_strerror(ret));
437
525
goto globalfail;
438
526
}
439
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
440
if (ret != GNUTLS_E_SUCCESS) {
441
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
442
safer_gnutls_strerror(ret));
527
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
528
if(ret != GNUTLS_E_SUCCESS){
529
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
530
safer_gnutls_strerror(ret));
443
531
goto globalfail;
444
532
}
445
533
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
534
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
447
535
448
536
return 0;
449
537
450
538
globalfail:
451
539
452
gnutls_certificate_free_credentials(mc->cred);
540
gnutls_certificate_free_credentials(mc.cred);
453
541
gnutls_global_deinit();
454
gnutls_dh_params_deinit(mc->dh_params);
542
gnutls_dh_params_deinit(mc.dh_params);
455
543
return -1;
456
544
}
457
545
458
static int init_gnutls_session(mandos_context *mc,
459
gnutls_session_t *session){
546
static int init_gnutls_session(gnutls_session_t *session){
460
547
int ret;
461
548
/* GnuTLS session creation */
462
ret = gnutls_init(session, GNUTLS_SERVER);
463
if (ret != GNUTLS_E_SUCCESS){
549
do {
550
ret = gnutls_init(session, GNUTLS_SERVER);
551
if(quit_now){
552
return -1;
553
}
554
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
555
if(ret != GNUTLS_E_SUCCESS){
464
556
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
465
557
safer_gnutls_strerror(ret));
466
558
}
467
559
468
560
{
469
561
const char *err;
470
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
471
if (ret != GNUTLS_E_SUCCESS) {
562
do {
563
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
564
if(quit_now){
565
gnutls_deinit(*session);
566
return -1;
567
}
568
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
569
if(ret != GNUTLS_E_SUCCESS){
472
570
fprintf(stderr, "Syntax error at: %s\n", err);
473
571
fprintf(stderr, "GnuTLS error: %s\n",
474
572
safer_gnutls_strerror(ret));
475
gnutls_deinit (*session);
573
gnutls_deinit(*session);
476
574
return -1;
477
575
}
478
576
}
479
577
480
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
481
mc->cred);
482
if (ret != GNUTLS_E_SUCCESS) {
578
do {
579
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
580
mc.cred);
581
if(quit_now){
582
gnutls_deinit(*session);
583
return -1;
584
}
585
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
586
if(ret != GNUTLS_E_SUCCESS){
483
587
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
484
588
safer_gnutls_strerror(ret));
485
gnutls_deinit (*session);
589
gnutls_deinit(*session);
486
590
return -1;
487
591
}
488
592
489
593
/* ignore client certificate if any. */
490
gnutls_certificate_server_set_request (*session,
491
GNUTLS_CERT_IGNORE);
594
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
492
595
493
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
596
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
494
597
495
598
return 0;
496
599
}
502
605
/* Called when a Mandos server is found */
503
606
static int start_mandos_communication(const char *ip, uint16_t port,
504
607
AvahiIfIndex if_index,
505
mandos_context *mc){
506
int ret, tcp_sd;
507
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
608
int af){
609
int ret, tcp_sd = -1;
610
ssize_t sret;
611
union {
612
struct sockaddr_in in;
613
struct sockaddr_in6 in6;
614
} to;
508
615
char *buffer = NULL;
509
char *decrypted_buffer;
616
char *decrypted_buffer = NULL;
510
617
size_t buffer_length = 0;
511
618
size_t buffer_capacity = 0;
512
ssize_t decrypted_buffer_size;
513
619
size_t written;
514
int retval = 0;
515
char interface[IF_NAMESIZE];
620
int retval = -1;
516
621
gnutls_session_t session;
517
518
ret = init_gnutls_session (mc, &session);
519
if (ret != 0){
622
int pf; /* Protocol family */
623
624
errno = 0;
625
626
if(quit_now){
627
errno = EINTR;
628
return -1;
629
}
630
631
switch(af){
632
case AF_INET6:
633
pf = PF_INET6;
634
break;
635
case AF_INET:
636
pf = PF_INET;
637
break;
638
default:
639
fprintf(stderr, "Bad address family: %d\n", af);
640
errno = EINVAL;
641
return -1;
642
}
643
644
ret = init_gnutls_session(&session);
645
if(ret != 0){
520
646
return -1;
521
647
}
522
648
523
649
if(debug){
524
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
650
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
525
651
"\n", ip, port);
526
652
}
527
653
528
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
529
if(tcp_sd < 0) {
530
perror("socket");
531
return -1;
654
tcp_sd = socket(pf, SOCK_STREAM, 0);
655
if(tcp_sd < 0){
656
int e = errno;
657
perror_plus("socket");
658
errno = e;
659
goto mandos_end;
532
660
}
533
661
534
if(debug){
535
if(if_indextoname((unsigned int)if_index, interface) == NULL){
536
perror("if_indextoname");
537
return -1;
538
}
539
fprintf(stderr, "Binding to interface %s\n", interface);
662
if(quit_now){
663
errno = EINTR;
664
goto mandos_end;
540
665
}
541
666
542
667
memset(&to, 0, sizeof(to));
543
to.in6.sin6_family = AF_INET6;
544
/* It would be nice to have a way to detect if we were passed an
545
IPv4 address here. Now we assume an IPv6 address. */
546
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
547
if (ret < 0 ){
548
perror("inet_pton");
549
return -1;
668
if(af == AF_INET6){
669
to.in6.sin6_family = (sa_family_t)af;
670
ret = inet_pton(af, ip, &to.in6.sin6_addr);
671
} else { /* IPv4 */
672
to.in.sin_family = (sa_family_t)af;
673
ret = inet_pton(af, ip, &to.in.sin_addr);
674
}
675
if(ret < 0 ){
676
int e = errno;
677
perror_plus("inet_pton");
678
errno = e;
679
goto mandos_end;
550
680
}
551
681
if(ret == 0){
682
int e = errno;
552
683
fprintf(stderr, "Bad address: %s\n", ip);
553
return -1;
554
}
555
to.in6.sin6_port = htons(port); /* Spurious warning */
684
errno = e;
685
goto mandos_end;
686
}
687
if(af == AF_INET6){
688
to.in6.sin6_port = htons(port); /* Spurious warnings from
689
-Wconversion and
690
-Wunreachable-code */
691
692
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
693
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
694
-Wunreachable-code*/
695
if(if_index == AVAHI_IF_UNSPEC){
696
fprintf(stderr, "An IPv6 link-local address is incomplete"
697
" without a network interface\n");
698
errno = EINVAL;
699
goto mandos_end;
700
}
701
/* Set the network interface number as scope */
702
to.in6.sin6_scope_id = (uint32_t)if_index;
703
}
704
} else {
705
to.in.sin_port = htons(port); /* Spurious warnings from
706
-Wconversion and
707
-Wunreachable-code */
708
}
556
709
557
to.in6.sin6_scope_id = (uint32_t)if_index;
710
if(quit_now){
711
errno = EINTR;
712
goto mandos_end;
713
}
558
714
559
715
if(debug){
560
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
561
port);
562
char addrstr[INET6_ADDRSTRLEN] = "";
563
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
564
sizeof(addrstr)) == NULL){
565
perror("inet_ntop");
716
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
717
char interface[IF_NAMESIZE];
718
if(if_indextoname((unsigned int)if_index, interface) == NULL){
719
perror_plus("if_indextoname");
720
} else {
721
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
722
ip, interface, port);
723
}
724
} else {
725
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
726
port);
727
}
728
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
729
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
730
const char *pcret;
731
if(af == AF_INET6){
732
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
733
sizeof(addrstr));
734
} else {
735
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
736
sizeof(addrstr));
737
}
738
if(pcret == NULL){
739
perror_plus("inet_ntop");
566
740
} else {
567
741
if(strcmp(addrstr, ip) != 0){
568
742
fprintf(stderr, "Canonical address form: %s\n", addrstr);
570
744
}
571
745
}
572
746
573
ret = connect(tcp_sd, &to.in, sizeof(to));
574
if (ret < 0){
575
perror("connect");
576
return -1;
747
if(quit_now){
748
errno = EINTR;
749
goto mandos_end;
750
}
751
752
if(af == AF_INET6){
753
ret = connect(tcp_sd, &to.in6, sizeof(to));
754
} else {
755
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
756
}
757
if(ret < 0){
758
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
759
int e = errno;
760
perror_plus("connect");
761
errno = e;
762
}
763
goto mandos_end;
764
}
765
766
if(quit_now){
767
errno = EINTR;
768
goto mandos_end;
577
769
}
578
770
579
771
const char *out = mandos_protocol_version;
580
772
written = 0;
581
while (true){
773
while(true){
582
774
size_t out_size = strlen(out);
583
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
775
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
584
776
out_size - written));
585
if (ret == -1){
586
perror("write");
587
retval = -1;
777
if(ret == -1){
778
int e = errno;
779
perror_plus("write");
780
errno = e;
588
781
goto mandos_end;
589
782
}
590
783
written += (size_t)ret;
591
784
if(written < out_size){
592
785
continue;
593
786
} else {
594
if (out == mandos_protocol_version){
787
if(out == mandos_protocol_version){
595
788
written = 0;
596
789
out = "\r\n";
597
790
} else {
598
791
break;
599
792
}
600
793
}
794
795
if(quit_now){
796
errno = EINTR;
797
goto mandos_end;
798
}
601
799
}
602
800
603
801
if(debug){
604
802
fprintf(stderr, "Establishing TLS session with %s\n", ip);
605
803
}
606
804
607
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
608
609
do{
610
ret = gnutls_handshake (session);
805
if(quit_now){
806
errno = EINTR;
807
goto mandos_end;
808
}
809
810
/* Spurious warning from -Wint-to-pointer-cast */
811
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
812
813
if(quit_now){
814
errno = EINTR;
815
goto mandos_end;
816
}
817
818
do {
819
ret = gnutls_handshake(session);
820
if(quit_now){
821
errno = EINTR;
822
goto mandos_end;
823
}
611
824
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
612
825
613
if (ret != GNUTLS_E_SUCCESS){
826
if(ret != GNUTLS_E_SUCCESS){
614
827
if(debug){
615
828
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
616
gnutls_perror (ret);
829
gnutls_perror(ret);
617
830
}
618
retval = -1;
831
errno = EPROTO;
619
832
goto mandos_end;
620
833
}
621
834
622
835
/* Read OpenPGP packet that contains the wanted password */
623
836
624
837
if(debug){
625
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
838
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
626
839
ip);
627
840
}
628
841
629
842
while(true){
630
buffer_capacity = adjustbuffer(&buffer, buffer_length,
843
844
if(quit_now){
845
errno = EINTR;
846
goto mandos_end;
847
}
848
849
buffer_capacity = incbuffer(&buffer, buffer_length,
631
850
buffer_capacity);
632
if (buffer_capacity == 0){
633
perror("adjustbuffer");
634
retval = -1;
635
goto mandos_end;
636
}
637
638
ret = gnutls_record_recv(session, buffer+buffer_length,
639
BUFFER_SIZE);
640
if (ret == 0){
851
if(buffer_capacity == 0){
852
int e = errno;
853
perror_plus("incbuffer");
854
errno = e;
855
goto mandos_end;
856
}
857
858
if(quit_now){
859
errno = EINTR;
860
goto mandos_end;
861
}
862
863
sret = gnutls_record_recv(session, buffer+buffer_length,
864
BUFFER_SIZE);
865
if(sret == 0){
641
866
break;
642
867
}
643
if (ret < 0){
644
switch(ret){
868
if(sret < 0){
869
switch(sret){
645
870
case GNUTLS_E_INTERRUPTED:
646
871
case GNUTLS_E_AGAIN:
647
872
break;
648
873
case GNUTLS_E_REHANDSHAKE:
649
do{
650
ret = gnutls_handshake (session);
874
do {
875
ret = gnutls_handshake(session);
876
877
if(quit_now){
878
errno = EINTR;
879
goto mandos_end;
880
}
651
881
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
652
if (ret < 0){
882
if(ret < 0){
653
883
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
654
gnutls_perror (ret);
655
retval = -1;
884
gnutls_perror(ret);
885
errno = EPROTO;
656
886
goto mandos_end;
657
887
}
658
888
break;
659
889
default:
660
890
fprintf(stderr, "Unknown error while reading data from"
661
891
" encrypted session with Mandos server\n");
662
retval = -1;
663
gnutls_bye (session, GNUTLS_SHUT_RDWR);
892
gnutls_bye(session, GNUTLS_SHUT_RDWR);
893
errno = EIO;
664
894
goto mandos_end;
665
895
}
666
896
} else {
667
buffer_length += (size_t) ret;
897
buffer_length += (size_t) sret;
668
898
}
669
899
}
670
900
672
902
fprintf(stderr, "Closing TLS session\n");
673
903
}
674
904
675
gnutls_bye (session, GNUTLS_SHUT_RDWR);
676
677
if (buffer_length > 0){
678
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
905
if(quit_now){
906
errno = EINTR;
907
goto mandos_end;
908
}
909
910
do {
911
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
912
if(quit_now){
913
errno = EINTR;
914
goto mandos_end;
915
}
916
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
917
918
if(buffer_length > 0){
919
ssize_t decrypted_buffer_size;
920
decrypted_buffer_size = pgp_packet_decrypt(buffer,
679
921
buffer_length,
680
922
&decrypted_buffer);
681
if (decrypted_buffer_size >= 0){
923
if(decrypted_buffer_size >= 0){
924
682
925
written = 0;
683
926
while(written < (size_t) decrypted_buffer_size){
684
ret = (int)fwrite (decrypted_buffer + written, 1,
685
(size_t)decrypted_buffer_size - written,
686
stdout);
927
if(quit_now){
928
errno = EINTR;
929
goto mandos_end;
930
}
931
932
ret = (int)fwrite(decrypted_buffer + written, 1,
933
(size_t)decrypted_buffer_size - written,
934
stdout);
687
935
if(ret == 0 and ferror(stdout)){
936
int e = errno;
688
937
if(debug){
689
938
fprintf(stderr, "Error writing encrypted data: %s\n",
690
939
strerror(errno));
691
940
}
692
retval = -1;
693
break;
941
errno = e;
942
goto mandos_end;
694
943
}
695
944
written += (size_t)ret;
696
945
}
697
free(decrypted_buffer);
698
} else {
699
retval = -1;
946
retval = 0;
700
947
}
701
} else {
702
retval = -1;
703
948
}
704
949
705
950
/* Shutdown procedure */
706
951
707
952
mandos_end:
708
free(buffer);
709
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
710
if(ret == -1){
711
perror("close");
953
{
954
int e = errno;
955
free(decrypted_buffer);
956
free(buffer);
957
if(tcp_sd >= 0){
958
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
959
}
960
if(ret == -1){
961
if(e == 0){
962
e = errno;
963
}
964
perror_plus("close");
965
}
966
gnutls_deinit(session);
967
errno = e;
968
if(quit_now){
969
errno = EINTR;
970
retval = -1;
971
}
712
972
}
713
gnutls_deinit (session);
714
973
return retval;
715
974
}
716
975
717
976
static void resolve_callback(AvahiSServiceResolver *r,
718
977
AvahiIfIndex interface,
719
AVAHI_GCC_UNUSED AvahiProtocol protocol,
978
AvahiProtocol proto,
720
979
AvahiResolverEvent event,
721
980
const char *name,
722
981
const char *type,
727
986
AVAHI_GCC_UNUSED AvahiStringList *txt,
728
987
AVAHI_GCC_UNUSED AvahiLookupResultFlags
729
988
flags,
730
void* userdata) {
731
mandos_context *mc = userdata;
989
AVAHI_GCC_UNUSED void* userdata){
732
990
assert(r);
733
991
734
992
/* Called whenever a service has been resolved successfully or
735
993
timed out */
736
994
737
switch (event) {
995
if(quit_now){
996
return;
997
}
998
999
switch(event){
738
1000
default:
739
1001
case AVAHI_RESOLVER_FAILURE:
740
1002
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
741
1003
" of type '%s' in domain '%s': %s\n", name, type, domain,
742
avahi_strerror(avahi_server_errno(mc->server)));
1004
avahi_strerror(avahi_server_errno(mc.server)));
743
1005
break;
744
1006
745
1007
case AVAHI_RESOLVER_FOUND:
748
1010
avahi_address_snprint(ip, sizeof(ip), address);
749
1011
if(debug){
750
1012
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
751
PRIu16 ") on port %d\n", name, host_name, ip,
752
interface, port);
1013
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1014
ip, (intmax_t)interface, port);
753
1015
}
754
int ret = start_mandos_communication(ip, port, interface, mc);
755
if (ret == 0){
756
avahi_simple_poll_quit(mc->simple_poll);
1016
int ret = start_mandos_communication(ip, port, interface,
1017
avahi_proto_to_af(proto));
1018
if(ret == 0){
1019
avahi_simple_poll_quit(mc.simple_poll);
1020
} else {
1021
ret = add_server(ip, port, interface,
1022
avahi_proto_to_af(proto));
757
1023
}
758
1024
}
759
1025
}
760
1026
avahi_s_service_resolver_free(r);
761
1027
}
762
1028
763
static void browse_callback( AvahiSServiceBrowser *b,
764
AvahiIfIndex interface,
765
AvahiProtocol protocol,
766
AvahiBrowserEvent event,
767
const char *name,
768
const char *type,
769
const char *domain,
770
AVAHI_GCC_UNUSED AvahiLookupResultFlags
771
flags,
772
void* userdata) {
773
mandos_context *mc = userdata;
1029
static void browse_callback(AvahiSServiceBrowser *b,
1030
AvahiIfIndex interface,
1031
AvahiProtocol protocol,
1032
AvahiBrowserEvent event,
1033
const char *name,
1034
const char *type,
1035
const char *domain,
1036
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1037
flags,
1038
AVAHI_GCC_UNUSED void* userdata){
774
1039
assert(b);
775
1040
776
1041
/* Called whenever a new services becomes available on the LAN or
777
1042
is removed from the LAN */
778
1043
779
switch (event) {
1044
if(quit_now){
1045
return;
1046
}
1047
1048
switch(event){
780
1049
default:
781
1050
case AVAHI_BROWSER_FAILURE:
782
1051
783
1052
fprintf(stderr, "(Avahi browser) %s\n",
784
avahi_strerror(avahi_server_errno(mc->server)));
785
avahi_simple_poll_quit(mc->simple_poll);
1053
avahi_strerror(avahi_server_errno(mc.server)));
1054
avahi_simple_poll_quit(mc.simple_poll);
786
1055
return;
787
1056
788
1057
case AVAHI_BROWSER_NEW:
791
1060
the callback function is called the Avahi server will free the
792
1061
resolver for us. */
793
1062
794
if (!(avahi_s_service_resolver_new(mc->server, interface,
795
protocol, name, type, domain,
796
AVAHI_PROTO_INET6, 0,
797
resolve_callback, mc)))
1063
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1064
name, type, domain, protocol, 0,
1065
resolve_callback, NULL) == NULL)
798
1066
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
799
name, avahi_strerror(avahi_server_errno(mc->server)));
1067
name, avahi_strerror(avahi_server_errno(mc.server)));
800
1068
break;
801
1069
802
1070
case AVAHI_BROWSER_REMOVE:
811
1079
}
812
1080
}
813
1081
1082
/* Signal handler that stops main loop after SIGTERM */
1083
static void handle_sigterm(int sig){
1084
if(quit_now){
1085
return;
1086
}
1087
quit_now = 1;
1088
signal_received = sig;
1089
int old_errno = errno;
1090
/* set main loop to exit */
1091
if(mc.simple_poll != NULL){
1092
avahi_simple_poll_quit(mc.simple_poll);
1093
}
1094
errno = old_errno;
1095
}
1096
1097
bool get_flags(const char *ifname, struct ifreq *ifr){
1098
int ret;
1099
1100
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1101
if(s < 0){
1102
perror_plus("socket");
1103
return false;
1104
}
1105
strcpy(ifr->ifr_name, ifname);
1106
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1107
if(ret == -1){
1108
if(debug){
1109
perror_plus("ioctl SIOCGIFFLAGS");
1110
}
1111
return false;
1112
}
1113
return true;
1114
}
1115
1116
bool good_flags(const char *ifname, const struct ifreq *ifr){
1117
1118
/* Reject the loopback device */
1119
if(ifr->ifr_flags & IFF_LOOPBACK){
1120
if(debug){
1121
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1122
ifname);
1123
}
1124
return false;
1125
}
1126
/* Accept point-to-point devices only if connect_to is specified */
1127
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1128
if(debug){
1129
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1130
ifname);
1131
}
1132
return true;
1133
}
1134
/* Otherwise, reject non-broadcast-capable devices */
1135
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1136
if(debug){
1137
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1138
ifname);
1139
}
1140
return false;
1141
}
1142
/* Reject non-ARP interfaces (including dummy interfaces) */
1143
if(ifr->ifr_flags & IFF_NOARP){
1144
if(debug){
1145
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1146
}
1147
return false;
1148
}
1149
1150
/* Accept this device */
1151
if(debug){
1152
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1153
}
1154
return true;
1155
}
1156
1157
/*
1158
* This function determines if a directory entry in /sys/class/net
1159
* corresponds to an acceptable network device.
1160
* (This function is passed to scandir(3) as a filter function.)
1161
*/
1162
int good_interface(const struct dirent *if_entry){
1163
int ret;
1164
if(if_entry->d_name[0] == '.'){
1165
return 0;
1166
}
1167
struct ifreq ifr;
1168
1169
if(not get_flags(if_entry->d_name, &ifr)){
1170
return 0;
1171
}
1172
1173
if(not good_flags(if_entry->d_name, &ifr)){
1174
return 0;
1175
}
1176
return 1;
1177
}
1178
1179
/*
1180
* This function determines if a directory entry in /sys/class/net
1181
* corresponds to an acceptable network device which is up.
1182
* (This function is passed to scandir(3) as a filter function.)
1183
*/
1184
int up_interface(const struct dirent *if_entry){
1185
ssize_t ssret;
1186
char *flagname = NULL;
1187
if(if_entry->d_name[0] == '.'){
1188
return 0;
1189
}
1190
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1191
if_entry->d_name);
1192
if(ret < 0){
1193
perror_plus("asprintf");
1194
return 0;
1195
}
1196
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1197
if(flags_fd == -1){
1198
perror_plus("open");
1199
free(flagname);
1200
return 0;
1201
}
1202
free(flagname);
1203
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1204
/* read line from flags_fd */
1205
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1206
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1207
flagstring[(size_t)to_read] = '\0';
1208
if(flagstring == NULL){
1209
perror_plus("malloc");
1210
close(flags_fd);
1211
return 0;
1212
}
1213
while(to_read > 0){
1214
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1215
(size_t)to_read));
1216
if(ssret == -1){
1217
perror_plus("read");
1218
free(flagstring);
1219
close(flags_fd);
1220
return 0;
1221
}
1222
to_read -= ssret;
1223
if(ssret == 0){
1224
break;
1225
}
1226
}
1227
close(flags_fd);
1228
intmax_t tmpmax;
1229
char *tmp;
1230
errno = 0;
1231
tmpmax = strtoimax(flagstring, &tmp, 0);
1232
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1233
and not (isspace(*tmp)))
1234
or tmpmax != (ifreq_flags)tmpmax){
1235
if(debug){
1236
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1237
flagstring, if_entry->d_name);
1238
}
1239
free(flagstring);
1240
return 0;
1241
}
1242
free(flagstring);
1243
ifreq_flags flags = (ifreq_flags)tmpmax;
1244
/* Reject the loopback device */
1245
if(flags & IFF_LOOPBACK){
1246
if(debug){
1247
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
/* Reject down interfaces */
1254
if(not (flags & IFF_UP)){
1255
return 0;
1256
}
1257
1258
/* Accept point-to-point devices only if connect_to is specified */
1259
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1260
if(debug){
1261
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1262
if_entry->d_name);
1263
}
1264
return 1;
1265
}
1266
/* Otherwise, reject non-broadcast-capable devices */
1267
if(not (flags & IFF_BROADCAST)){
1268
if(debug){
1269
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1270
if_entry->d_name);
1271
}
1272
return 0;
1273
}
1274
/* Reject non-ARP interfaces (including dummy interfaces) */
1275
if(flags & IFF_NOARP){
1276
if(debug){
1277
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1278
if_entry->d_name);
1279
}
1280
return 0;
1281
}
1282
/* Accept this device */
1283
if(debug){
1284
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1285
if_entry->d_name);
1286
}
1287
return 1;
1288
}
1289
1290
int notdotentries(const struct dirent *direntry){
1291
/* Skip "." and ".." */
1292
if(direntry->d_name[0] == '.'
1293
and (direntry->d_name[1] == '\0'
1294
or (direntry->d_name[1] == '.'
1295
and direntry->d_name[2] == '\0'))){
1296
return 0;
1297
}
1298
return 1;
1299
}
1300
1301
/* Is this directory entry a runnable program? */
1302
int runnable_hook(const struct dirent *direntry){
1303
int ret;
1304
struct stat st;
1305
1306
if((direntry->d_name)[0] == '\0'){
1307
/* Empty name? */
1308
return 0;
1309
}
1310
1311
/* Save pointer to last character */
1312
char *end = strchr(direntry->d_name, '\0')-1;
1313
1314
if(*end == '~'){
1315
/* Backup name~ */
1316
return 0;
1317
}
1318
1319
if(((direntry->d_name)[0] == '#')
1320
and (*end == '#')){
1321
/* Temporary #name# */
1322
return 0;
1323
}
1324
1325
/* XXX more rules here */
1326
1327
ret = stat(direntry->d_name, &st);
1328
if(ret == -1){
1329
if(debug){
1330
perror_plus("Could not stat plugin");
1331
}
1332
return 0;
1333
}
1334
if(not (st.st_mode & S_ISREG)){
1335
/* Not a regular file */
1336
return 0;
1337
}
1338
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1339
/* Not executable */
1340
return 0;
1341
}
1342
return 1;
1343
}
1344
1345
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1346
int ret;
1347
struct timespec now;
1348
struct timespec waited_time;
1349
intmax_t block_time;
1350
1351
while(true){
1352
if(mc.current_server == NULL){
1353
if (debug){
1354
fprintf(stderr,
1355
"Wait until first server is found. No timeout!\n");
1356
}
1357
ret = avahi_simple_poll_iterate(s, -1);
1358
} else {
1359
if (debug){
1360
fprintf(stderr, "Check current_server if we should run it,"
1361
" or wait\n");
1362
}
1363
/* the current time */
1364
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1365
if(ret == -1){
1366
perror_plus("clock_gettime");
1367
return -1;
1368
}
1369
/* Calculating in ms how long time between now and server
1370
who we visted longest time ago. Now - last seen. */
1371
waited_time.tv_sec = (now.tv_sec
1372
- mc.current_server->last_seen.tv_sec);
1373
waited_time.tv_nsec = (now.tv_nsec
1374
- mc.current_server->last_seen.tv_nsec);
1375
/* total time is 10s/10,000ms.
1376
Converting to s from ms by dividing by 1,000,
1377
and ns to ms by dividing by 1,000,000. */
1378
block_time = ((retry_interval
1379
- ((intmax_t)waited_time.tv_sec * 1000))
1380
- ((intmax_t)waited_time.tv_nsec / 1000000));
1381
1382
if (debug){
1383
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1384
}
1385
1386
if(block_time <= 0){
1387
ret = start_mandos_communication(mc.current_server->ip,
1388
mc.current_server->port,
1389
mc.current_server->if_index,
1390
mc.current_server->af);
1391
if(ret == 0){
1392
avahi_simple_poll_quit(mc.simple_poll);
1393
return 0;
1394
}
1395
ret = clock_gettime(CLOCK_MONOTONIC,
1396
&mc.current_server->last_seen);
1397
if(ret == -1){
1398
perror_plus("clock_gettime");
1399
return -1;
1400
}
1401
mc.current_server = mc.current_server->next;
1402
block_time = 0; /* Call avahi to find new Mandos
1403
servers, but don't block */
1404
}
1405
1406
ret = avahi_simple_poll_iterate(s, (int)block_time);
1407
}
1408
if(ret != 0){
1409
if (ret > 0 or errno != EINTR) {
1410
return (ret != 1) ? ret : 0;
1411
}
1412
}
1413
}
1414
}
1415
814
1416
int main(int argc, char *argv[]){
815
AvahiSServiceBrowser *sb = NULL;
816
int error;
817
int ret;
818
int exitcode = EXIT_SUCCESS;
819
const char *interface = "eth0";
820
struct ifreq network;
821
int sd;
822
uid_t uid;
823
gid_t gid;
824
char *connect_to = NULL;
825
char tempdir[] = "/tmp/mandosXXXXXX";
826
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
827
const char *seckey = PATHDIR "/" SECKEY;
828
const char *pubkey = PATHDIR "/" PUBKEY;
829
830
mandos_context mc = { .simple_poll = NULL, .server = NULL,
831
.dh_bits = 1024, .priority = "SECURE256"
832
":!CTYPE-X.509:+CTYPE-OPENPGP" };
833
bool gnutls_initalized = false;
834
bool gpgme_initalized = false;
835
836
{
837
struct argp_option options[] = {
838
{ .name = "debug", .key = 128,
839
.doc = "Debug mode", .group = 3 },
840
{ .name = "connect", .key = 'c',
841
.arg = "ADDRESS:PORT",
842
.doc = "Connect directly to a specific Mandos server",
843
.group = 1 },
844
{ .name = "interface", .key = 'i',
845
.arg = "NAME",
846
.doc = "Interface that will be used to search for Mandos"
847
" servers",
848
.group = 1 },
849
{ .name = "seckey", .key = 's',
850
.arg = "FILE",
851
.doc = "OpenPGP secret key file base name",
852
.group = 1 },
853
{ .name = "pubkey", .key = 'p',
854
.arg = "FILE",
855
.doc = "OpenPGP public key file base name",
856
.group = 2 },
857
{ .name = "dh-bits", .key = 129,
858
.arg = "BITS",
859
.doc = "Bit length of the prime number used in the"
860
" Diffie-Hellman key exchange",
861
.group = 2 },
862
{ .name = "priority", .key = 130,
863
.arg = "STRING",
864
.doc = "GnuTLS priority string for the TLS handshake",
865
.group = 1 },
866
{ .name = NULL }
867
};
868
869
error_t parse_opt (int key, char *arg,
870
struct argp_state *state) {
871
/* Get the INPUT argument from `argp_parse', which we know is
872
a pointer to our plugin list pointer. */
873
switch (key) {
874
case 128: /* --debug */
875
debug = true;
876
break;
877
case 'c': /* --connect */
878
connect_to = arg;
879
break;
880
case 'i': /* --interface */
881
interface = arg;
882
break;
883
case 's': /* --seckey */
884
seckey = arg;
885
break;
886
case 'p': /* --pubkey */
887
pubkey = arg;
888
break;
889
case 129: /* --dh-bits */
890
errno = 0;
891
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
892
if (errno){
893
perror("strtol");
894
exit(EXIT_FAILURE);
895
}
896
break;
897
case 130: /* --priority */
898
mc.priority = arg;
899
break;
900
case ARGP_KEY_ARG:
901
argp_usage (state);
902
case ARGP_KEY_END:
903
break;
904
default:
905
return ARGP_ERR_UNKNOWN;
906
}
907
return 0;
908
}
909
910
struct argp argp = { .options = options, .parser = parse_opt,
911
.args_doc = "",
912
.doc = "Mandos client -- Get and decrypt"
913
" passwords from a Mandos server" };
914
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
915
if (ret == ARGP_ERR_UNKNOWN){
916
fprintf(stderr, "Unknown error while parsing arguments\n");
917
exitcode = EXIT_FAILURE;
918
goto end;
919
}
920
}
921
922
/* If the interface is down, bring it up */
923
{
924
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
925
if(sd < 0) {
926
perror("socket");
927
exitcode = EXIT_FAILURE;
928
goto end;
929
}
930
strcpy(network.ifr_name, interface);
931
ret = ioctl(sd, SIOCGIFFLAGS, &network);
932
if(ret == -1){
933
perror("ioctl SIOCGIFFLAGS");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
if((network.ifr_flags & IFF_UP) == 0){
938
network.ifr_flags |= IFF_UP;
939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
940
if(ret == -1){
941
perror("ioctl SIOCSIFFLAGS");
942
exitcode = EXIT_FAILURE;
943
goto end;
944
}
945
}
946
ret = TEMP_FAILURE_RETRY(close(sd));
947
if(ret == -1){
948
perror("close");
949
}
950
}
951
952
uid = getuid();
953
gid = getgid();
954
955
ret = setuid(uid);
956
if (ret == -1){
957
perror("setuid");
958
}
959
960
setgid(gid);
961
if (ret == -1){
962
perror("setgid");
963
}
964
965
ret = init_gnutls_global(&mc, pubkey, seckey);
966
if (ret == -1){
967
fprintf(stderr, "init_gnutls_global failed\n");
968
exitcode = EXIT_FAILURE;
969
goto end;
970
} else {
971
gnutls_initalized = true;
972
}
973
974
if(mkdtemp(tempdir) == NULL){
975
perror("mkdtemp");
976
tempdir[0] = '\0';
977
goto end;
978
}
979
980
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
981
fprintf(stderr, "gpgme_initalized failed\n");
982
exitcode = EXIT_FAILURE;
983
goto end;
984
} else {
985
gpgme_initalized = true;
986
}
987
1417
AvahiSServiceBrowser *sb = NULL;
1418
int error;
1419
int ret;
1420
intmax_t tmpmax;
1421
char *tmp;
1422
int exitcode = EXIT_SUCCESS;
1423
const char *interface = "";
1424
struct ifreq network;
1425
int sd = -1;
1426
bool take_down_interface = false;
1427
uid_t uid;
1428
gid_t gid;
1429
char tempdir[] = "/tmp/mandosXXXXXX";
1430
bool tempdir_created = false;
1431
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1432
const char *seckey = PATHDIR "/" SECKEY;
1433
const char *pubkey = PATHDIR "/" PUBKEY;
1434
1435
bool gnutls_initialized = false;
1436
bool gpgme_initialized = false;
1437
float delay = 2.5f;
1438
double retry_interval = 10; /* 10s between trying a server and
1439
retrying the same server again */
1440
1441
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1442
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1443
1444
uid = getuid();
1445
gid = getgid();
1446
1447
/* Lower any group privileges we might have, just to be safe */
1448
errno = 0;
1449
ret = setgid(gid);
1450
if(ret == -1){
1451
perror_plus("setgid");
1452
}
1453
1454
/* Lower user privileges (temporarily) */
1455
errno = 0;
1456
ret = seteuid(uid);
1457
if(ret == -1){
1458
perror_plus("seteuid");
1459
}
1460
1461
if(quit_now){
1462
goto end;
1463
}
1464
1465
{
1466
struct argp_option options[] = {
1467
{ .name = "debug", .key = 128,
1468
.doc = "Debug mode", .group = 3 },
1469
{ .name = "connect", .key = 'c',
1470
.arg = "ADDRESS:PORT",
1471
.doc = "Connect directly to a specific Mandos server",
1472
.group = 1 },
1473
{ .name = "interface", .key = 'i',
1474
.arg = "NAME",
1475
.doc = "Network interface that will be used to search for"
1476
" Mandos servers",
1477
.group = 1 },
1478
{ .name = "seckey", .key = 's',
1479
.arg = "FILE",
1480
.doc = "OpenPGP secret key file base name",
1481
.group = 1 },
1482
{ .name = "pubkey", .key = 'p',
1483
.arg = "FILE",
1484
.doc = "OpenPGP public key file base name",
1485
.group = 2 },
1486
{ .name = "dh-bits", .key = 129,
1487
.arg = "BITS",
1488
.doc = "Bit length of the prime number used in the"
1489
" Diffie-Hellman key exchange",
1490
.group = 2 },
1491
{ .name = "priority", .key = 130,
1492
.arg = "STRING",
1493
.doc = "GnuTLS priority string for the TLS handshake",
1494
.group = 1 },
1495
{ .name = "delay", .key = 131,
1496
.arg = "SECONDS",
1497
.doc = "Maximum delay to wait for interface startup",
1498
.group = 2 },
1499
{ .name = "retry", .key = 132,
1500
.arg = "SECONDS",
1501
.doc = "Retry interval used when denied by the mandos server",
1502
.group = 2 },
1503
/*
1504
* These reproduce what we would get without ARGP_NO_HELP
1505
*/
1506
{ .name = "help", .key = '?',
1507
.doc = "Give this help list", .group = -1 },
1508
{ .name = "usage", .key = -3,
1509
.doc = "Give a short usage message", .group = -1 },
1510
{ .name = "version", .key = 'V',
1511
.doc = "Print program version", .group = -1 },
1512
{ .name = NULL }
1513
};
1514
1515
error_t parse_opt(int key, char *arg,
1516
struct argp_state *state){
1517
errno = 0;
1518
switch(key){
1519
case 128: /* --debug */
1520
debug = true;
1521
break;
1522
case 'c': /* --connect */
1523
connect_to = arg;
1524
break;
1525
case 'i': /* --interface */
1526
interface = arg;
1527
break;
1528
case 's': /* --seckey */
1529
seckey = arg;
1530
break;
1531
case 'p': /* --pubkey */
1532
pubkey = arg;
1533
break;
1534
case 129: /* --dh-bits */
1535
errno = 0;
1536
tmpmax = strtoimax(arg, &tmp, 10);
1537
if(errno != 0 or tmp == arg or *tmp != '\0'
1538
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1539
argp_error(state, "Bad number of DH bits");
1540
}
1541
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1542
break;
1543
case 130: /* --priority */
1544
mc.priority = arg;
1545
break;
1546
case 131: /* --delay */
1547
errno = 0;
1548
delay = strtof(arg, &tmp);
1549
if(errno != 0 or tmp == arg or *tmp != '\0'){
1550
argp_error(state, "Bad delay");
1551
}
1552
case 132: /* --retry */
1553
errno = 0;
1554
retry_interval = strtod(arg, &tmp);
1555
if(errno != 0 or tmp == arg or *tmp != '\0'
1556
or (retry_interval * 1000) > INT_MAX
1557
or retry_interval < 0){
1558
argp_error(state, "Bad retry interval");
1559
}
1560
break;
1561
/*
1562
* These reproduce what we would get without ARGP_NO_HELP
1563
*/
1564
case '?': /* --help */
1565
argp_state_help(state, state->out_stream,
1566
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1567
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1568
case -3: /* --usage */
1569
argp_state_help(state, state->out_stream,
1570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1571
case 'V': /* --version */
1572
fprintf(state->out_stream, "%s\n", argp_program_version);
1573
exit(argp_err_exit_status);
1574
break;
1575
default:
1576
return ARGP_ERR_UNKNOWN;
1577
}
1578
return errno;
1579
}
1580
1581
struct argp argp = { .options = options, .parser = parse_opt,
1582
.args_doc = "",
1583
.doc = "Mandos client -- Get and decrypt"
1584
" passwords from a Mandos server" };
1585
ret = argp_parse(&argp, argc, argv,
1586
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1587
switch(ret){
1588
case 0:
1589
break;
1590
case ENOMEM:
1591
default:
1592
errno = ret;
1593
perror_plus("argp_parse");
1594
exitcode = EX_OSERR;
1595
goto end;
1596
case EINVAL:
1597
exitcode = EX_USAGE;
1598
goto end;
1599
}
1600
}
1601
1602
{
1603
/* Work around Debian bug #633582:
1604
<http://bugs.debian.org/633582> */
1605
struct stat st;
1606
1607
/* Re-raise priviliges */
1608
errno = 0;
1609
ret = seteuid(0);
1610
if(ret == -1){
1611
perror_plus("seteuid");
1612
}
1613
1614
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1615
int seckey_fd = open(seckey, O_RDONLY);
1616
if(seckey_fd == -1){
1617
perror_plus("open");
1618
} else {
1619
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1620
if(ret == -1){
1621
perror_plus("fstat");
1622
} else {
1623
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1624
ret = fchown(seckey_fd, uid, gid);
1625
if(ret == -1){
1626
perror_plus("fchown");
1627
}
1628
}
1629
}
1630
TEMP_FAILURE_RETRY(close(seckey_fd));
1631
}
1632
}
1633
1634
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1635
int pubkey_fd = open(pubkey, O_RDONLY);
1636
if(pubkey_fd == -1){
1637
perror_plus("open");
1638
} else {
1639
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1640
if(ret == -1){
1641
perror_plus("fstat");
1642
} else {
1643
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1644
ret = fchown(pubkey_fd, uid, gid);
1645
if(ret == -1){
1646
perror_plus("fchown");
1647
}
1648
}
1649
}
1650
TEMP_FAILURE_RETRY(close(pubkey_fd));
1651
}
1652
}
1653
1654
/* Lower privileges */
1655
errno = 0;
1656
ret = seteuid(uid);
1657
if(ret == -1){
1658
perror_plus("seteuid");
1659
}
1660
}
1661
1662
/* Find network hooks and run them */
1663
{
1664
struct dirent **direntries;
1665
struct dirent *direntry;
1666
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1667
alphasort);
1668
int devnull = open("/dev/null", O_RDONLY);
1669
for(int i = 0; i < numhooks; i++){
1670
direntry = direntries[0];
1671
char *fullname = NULL;
1672
ret = asprintf(&fullname, "%s/%s", tempdir,
1673
direntry->d_name);
1674
if(ret < 0){
1675
perror_plus("asprintf");
1676
continue;
1677
}
1678
pid_t hook_pid = fork();
1679
if(hook_pid == 0){
1680
/* Child */
1681
dup2(devnull, STDIN_FILENO);
1682
close(devnull);
1683
dup2(STDERR_FILENO, STDOUT_FILENO);
1684
setenv("DEVICE", interface, 1);
1685
setenv("VERBOSE", debug ? "1" : "0", 1);
1686
setenv("MODE", "start", 1);
1687
/* setenv( XXX more here */
1688
ret = execl(fullname, direntry->d_name, "start");
1689
perror_plus("execl");
1690
}
1691
free(fullname);
1692
if(quit_now){
1693
goto end;
1694
}
1695
}
1696
close(devnull);
1697
}
1698
1699
if(not debug){
1700
avahi_set_log_function(empty_log);
1701
}
1702
1703
if(interface[0] == '\0'){
1704
struct dirent **direntries;
1705
ret = scandir(sys_class_net, &direntries, good_interface,
1706
alphasort);
1707
if(ret >= 1){
1708
/* Pick the first good interface */
1709
interface = strdup(direntries[0]->d_name);
1710
if(debug){
1711
fprintf(stderr, "Using interface \"%s\"\n", interface);
1712
}
1713
if(interface == NULL){
1714
perror_plus("malloc");
1715
free(direntries);
1716
exitcode = EXIT_FAILURE;
1717
goto end;
1718
}
1719
free(direntries);
1720
} else {
1721
free(direntries);
1722
fprintf(stderr, "Could not find a network interface\n");
1723
exitcode = EXIT_FAILURE;
1724
goto end;
1725
}
1726
}
1727
1728
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1729
from the signal handler */
1730
/* Initialize the pseudo-RNG for Avahi */
1731
srand((unsigned int) time(NULL));
1732
mc.simple_poll = avahi_simple_poll_new();
1733
if(mc.simple_poll == NULL){
1734
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1735
exitcode = EX_UNAVAILABLE;
1736
goto end;
1737
}
1738
1739
sigemptyset(&sigterm_action.sa_mask);
1740
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1741
if(ret == -1){
1742
perror_plus("sigaddset");
1743
exitcode = EX_OSERR;
1744
goto end;
1745
}
1746
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1747
if(ret == -1){
1748
perror_plus("sigaddset");
1749
exitcode = EX_OSERR;
1750
goto end;
1751
}
1752
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1753
if(ret == -1){
1754
perror_plus("sigaddset");
1755
exitcode = EX_OSERR;
1756
goto end;
1757
}
1758
/* Need to check if the handler is SIG_IGN before handling:
1759
| [[info:libc:Initial Signal Actions]] |
1760
| [[info:libc:Basic Signal Handling]] |
1761
*/
1762
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1763
if(ret == -1){
1764
perror_plus("sigaction");
1765
return EX_OSERR;
1766
}
1767
if(old_sigterm_action.sa_handler != SIG_IGN){
1768
ret = sigaction(SIGINT, &sigterm_action, NULL);
1769
if(ret == -1){
1770
perror_plus("sigaction");
1771
exitcode = EX_OSERR;
1772
goto end;
1773
}
1774
}
1775
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1776
if(ret == -1){
1777
perror_plus("sigaction");
1778
return EX_OSERR;
1779
}
1780
if(old_sigterm_action.sa_handler != SIG_IGN){
1781
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1782
if(ret == -1){
1783
perror_plus("sigaction");
1784
exitcode = EX_OSERR;
1785
goto end;
1786
}
1787
}
1788
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1789
if(ret == -1){
1790
perror_plus("sigaction");
1791
return EX_OSERR;
1792
}
1793
if(old_sigterm_action.sa_handler != SIG_IGN){
1794
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1795
if(ret == -1){
1796
perror_plus("sigaction");
1797
exitcode = EX_OSERR;
1798
goto end;
1799
}
1800
}
1801
1802
/* If the interface is down, bring it up */
1803
if(strcmp(interface, "none") != 0){
988
1804
if_index = (AvahiIfIndex) if_nametoindex(interface);
989
1805
if(if_index == 0){
990
1806
fprintf(stderr, "No such interface: \"%s\"\n", interface);
991
exit(EXIT_FAILURE);
992
}
993
994
if(connect_to != NULL){
995
/* Connect directly, do not use Zeroconf */
996
/* (Mainly meant for debugging) */
997
char *address = strrchr(connect_to, ':');
998
if(address == NULL){
999
fprintf(stderr, "No colon in address\n");
1000
exitcode = EXIT_FAILURE;
1001
goto end;
1002
}
1003
errno = 0;
1004
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1005
if(errno){
1006
perror("Bad port number");
1007
exitcode = EXIT_FAILURE;
1008
goto end;
1009
}
1010
*address = '\0';
1011
address = connect_to;
1012
ret = start_mandos_communication(address, port, if_index, &mc);
1013
if(ret < 0){
1014
exitcode = EXIT_FAILURE;
1015
} else {
1016
exitcode = EXIT_SUCCESS;
1017
}
1018
goto end;
1019
}
1020
1021
if (not debug){
1022
avahi_set_log_function(empty_log);
1023
}
1024
1025
/* Initialize the pseudo-RNG for Avahi */
1026
srand((unsigned int) time(NULL));
1027
1028
/* Allocate main Avahi loop object */
1029
mc.simple_poll = avahi_simple_poll_new();
1030
if (mc.simple_poll == NULL) {
1031
fprintf(stderr, "Avahi: Failed to create simple poll"
1032
" object.\n");
1033
exitcode = EXIT_FAILURE;
1034
goto end;
1035
}
1036
1037
{
1038
AvahiServerConfig config;
1039
/* Do not publish any local Zeroconf records */
1040
avahi_server_config_init(&config);
1041
config.publish_hinfo = 0;
1042
config.publish_addresses = 0;
1043
config.publish_workstation = 0;
1044
config.publish_domain = 0;
1045
1046
/* Allocate a new server */
1047
mc.server = avahi_server_new(avahi_simple_poll_get
1048
(mc.simple_poll), &config, NULL,
1049
NULL, &error);
1050
1051
/* Free the Avahi configuration data */
1052
avahi_server_config_free(&config);
1053
}
1054
1055
/* Check if creating the Avahi server object succeeded */
1056
if (mc.server == NULL) {
1057
fprintf(stderr, "Failed to create Avahi server: %s\n",
1058
avahi_strerror(error));
1059
exitcode = EXIT_FAILURE;
1060
goto end;
1061
}
1062
1063
/* Create the Avahi service browser */
1064
sb = avahi_s_service_browser_new(mc.server, if_index,
1065
AVAHI_PROTO_INET6,
1066
"_mandos._tcp", NULL, 0,
1067
browse_callback, &mc);
1068
if (sb == NULL) {
1069
fprintf(stderr, "Failed to create service browser: %s\n",
1070
avahi_strerror(avahi_server_errno(mc.server)));
1071
exitcode = EXIT_FAILURE;
1072
goto end;
1073
}
1074
1075
/* Run the main loop */
1076
1077
if (debug){
1078
fprintf(stderr, "Starting Avahi loop search\n");
1079
}
1080
1081
avahi_simple_poll_loop(mc.simple_poll);
1082
1807
exitcode = EX_UNAVAILABLE;
1808
goto end;
1809
}
1810
1811
if(quit_now){
1812
goto end;
1813
}
1814
1815
/* Re-raise priviliges */
1816
errno = 0;
1817
ret = seteuid(0);
1818
if(ret == -1){
1819
perror_plus("seteuid");
1820
}
1821
1822
#ifdef __linux__
1823
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1824
messages about the network interface to mess up the prompt */
1825
ret = klogctl(8, NULL, 5);
1826
bool restore_loglevel = true;
1827
if(ret == -1){
1828
restore_loglevel = false;
1829
perror_plus("klogctl");
1830
}
1831
#endif /* __linux__ */
1832
1833
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1834
if(sd < 0){
1835
perror_plus("socket");
1836
exitcode = EX_OSERR;
1837
#ifdef __linux__
1838
if(restore_loglevel){
1839
ret = klogctl(7, NULL, 0);
1840
if(ret == -1){
1841
perror_plus("klogctl");
1842
}
1843
}
1844
#endif /* __linux__ */
1845
/* Lower privileges */
1846
errno = 0;
1847
ret = seteuid(uid);
1848
if(ret == -1){
1849
perror_plus("seteuid");
1850
}
1851
goto end;
1852
}
1853
strcpy(network.ifr_name, interface);
1854
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1855
if(ret == -1){
1856
perror_plus("ioctl SIOCGIFFLAGS");
1857
#ifdef __linux__
1858
if(restore_loglevel){
1859
ret = klogctl(7, NULL, 0);
1860
if(ret == -1){
1861
perror_plus("klogctl");
1862
}
1863
}
1864
#endif /* __linux__ */
1865
exitcode = EX_OSERR;
1866
/* Lower privileges */
1867
errno = 0;
1868
ret = seteuid(uid);
1869
if(ret == -1){
1870
perror_plus("seteuid");
1871
}
1872
goto end;
1873
}
1874
if((network.ifr_flags & IFF_UP) == 0){
1875
network.ifr_flags |= IFF_UP;
1876
take_down_interface = true;
1877
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1878
if(ret == -1){
1879
take_down_interface = false;
1880
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1881
exitcode = EX_OSERR;
1882
#ifdef __linux__
1883
if(restore_loglevel){
1884
ret = klogctl(7, NULL, 0);
1885
if(ret == -1){
1886
perror_plus("klogctl");
1887
}
1888
}
1889
#endif /* __linux__ */
1890
/* Lower privileges */
1891
errno = 0;
1892
ret = seteuid(uid);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
goto end;
1897
}
1898
}
1899
/* Sleep checking until interface is running.
1900
Check every 0.25s, up to total time of delay */
1901
for(int i=0; i < delay * 4; i++){
1902
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1903
if(ret == -1){
1904
perror_plus("ioctl SIOCGIFFLAGS");
1905
} else if(network.ifr_flags & IFF_RUNNING){
1906
break;
1907
}
1908
struct timespec sleeptime = { .tv_nsec = 250000000 };
1909
ret = nanosleep(&sleeptime, NULL);
1910
if(ret == -1 and errno != EINTR){
1911
perror_plus("nanosleep");
1912
}
1913
}
1914
if(not take_down_interface){
1915
/* We won't need the socket anymore */
1916
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1917
if(ret == -1){
1918
perror_plus("close");
1919
}
1920
}
1921
#ifdef __linux__
1922
if(restore_loglevel){
1923
/* Restores kernel loglevel to default */
1924
ret = klogctl(7, NULL, 0);
1925
if(ret == -1){
1926
perror_plus("klogctl");
1927
}
1928
}
1929
#endif /* __linux__ */
1930
/* Lower privileges */
1931
errno = 0;
1932
if(take_down_interface){
1933
/* Lower privileges */
1934
ret = seteuid(uid);
1935
if(ret == -1){
1936
perror_plus("seteuid");
1937
}
1938
} else {
1939
/* Lower privileges permanently */
1940
ret = setuid(uid);
1941
if(ret == -1){
1942
perror_plus("setuid");
1943
}
1944
}
1945
}
1946
1947
if(quit_now){
1948
goto end;
1949
}
1950
1951
ret = init_gnutls_global(pubkey, seckey);
1952
if(ret == -1){
1953
fprintf(stderr, "init_gnutls_global failed\n");
1954
exitcode = EX_UNAVAILABLE;
1955
goto end;
1956
} else {
1957
gnutls_initialized = true;
1958
}
1959
1960
if(quit_now){
1961
goto end;
1962
}
1963
1964
if(mkdtemp(tempdir) == NULL){
1965
perror_plus("mkdtemp");
1966
goto end;
1967
}
1968
tempdir_created = true;
1969
1970
if(quit_now){
1971
goto end;
1972
}
1973
1974
if(not init_gpgme(pubkey, seckey, tempdir)){
1975
fprintf(stderr, "init_gpgme failed\n");
1976
exitcode = EX_UNAVAILABLE;
1977
goto end;
1978
} else {
1979
gpgme_initialized = true;
1980
}
1981
1982
if(quit_now){
1983
goto end;
1984
}
1985
1986
if(connect_to != NULL){
1987
/* Connect directly, do not use Zeroconf */
1988
/* (Mainly meant for debugging) */
1989
char *address = strrchr(connect_to, ':');
1990
if(address == NULL){
1991
fprintf(stderr, "No colon in address\n");
1992
exitcode = EX_USAGE;
1993
goto end;
1994
}
1995
1996
if(quit_now){
1997
goto end;
1998
}
1999
2000
uint16_t port;
2001
errno = 0;
2002
tmpmax = strtoimax(address+1, &tmp, 10);
2003
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2004
or tmpmax != (uint16_t)tmpmax){
2005
fprintf(stderr, "Bad port number\n");
2006
exitcode = EX_USAGE;
2007
goto end;
2008
}
2009
2010
if(quit_now){
2011
goto end;
2012
}
2013
2014
port = (uint16_t)tmpmax;
2015
*address = '\0';
2016
/* Colon in address indicates IPv6 */
2017
int af;
2018
if(strchr(connect_to, ':') != NULL){
2019
af = AF_INET6;
2020
/* Accept [] around IPv6 address - see RFC 5952 */
2021
if(connect_to[0] == '[' and address[-1] == ']')
2022
{
2023
connect_to++;
2024
address[-1] = '\0';
2025
}
2026
} else {
2027
af = AF_INET;
2028
}
2029
address = connect_to;
2030
2031
if(quit_now){
2032
goto end;
2033
}
2034
2035
while(not quit_now){
2036
ret = start_mandos_communication(address, port, if_index, af);
2037
if(quit_now or ret == 0){
2038
break;
2039
}
2040
if(debug){
2041
fprintf(stderr, "Retrying in %d seconds\n",
2042
(int)retry_interval);
2043
}
2044
sleep((int)retry_interval);
2045
}
2046
2047
if (not quit_now){
2048
exitcode = EXIT_SUCCESS;
2049
}
2050
2051
goto end;
2052
}
2053
2054
if(quit_now){
2055
goto end;
2056
}
2057
2058
{
2059
AvahiServerConfig config;
2060
/* Do not publish any local Zeroconf records */
2061
avahi_server_config_init(&config);
2062
config.publish_hinfo = 0;
2063
config.publish_addresses = 0;
2064
config.publish_workstation = 0;
2065
config.publish_domain = 0;
2066
2067
/* Allocate a new server */
2068
mc.server = avahi_server_new(avahi_simple_poll_get
2069
(mc.simple_poll), &config, NULL,
2070
NULL, &error);
2071
2072
/* Free the Avahi configuration data */
2073
avahi_server_config_free(&config);
2074
}
2075
2076
/* Check if creating the Avahi server object succeeded */
2077
if(mc.server == NULL){
2078
fprintf(stderr, "Failed to create Avahi server: %s\n",
2079
avahi_strerror(error));
2080
exitcode = EX_UNAVAILABLE;
2081
goto end;
2082
}
2083
2084
if(quit_now){
2085
goto end;
2086
}
2087
2088
/* Create the Avahi service browser */
2089
sb = avahi_s_service_browser_new(mc.server, if_index,
2090
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2091
NULL, 0, browse_callback, NULL);
2092
if(sb == NULL){
2093
fprintf(stderr, "Failed to create service browser: %s\n",
2094
avahi_strerror(avahi_server_errno(mc.server)));
2095
exitcode = EX_UNAVAILABLE;
2096
goto end;
2097
}
2098
2099
if(quit_now){
2100
goto end;
2101
}
2102
2103
/* Run the main loop */
2104
2105
if(debug){
2106
fprintf(stderr, "Starting Avahi loop search\n");
2107
}
2108
2109
ret = avahi_loop_with_timeout(mc.simple_poll,
2110
(int)(retry_interval * 1000));
2111
if(debug){
2112
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2113
(ret == 0) ? "successfully" : "with error");
2114
}
2115
1083
2116
end:
1084
1085
if (debug){
1086
fprintf(stderr, "%s exiting\n", argv[0]);
1087
}
1088
1089
/* Cleanup things */
1090
if (sb != NULL)
1091
avahi_s_service_browser_free(sb);
1092
1093
if (mc.server != NULL)
1094
avahi_server_free(mc.server);
1095
1096
if (mc.simple_poll != NULL)
1097
avahi_simple_poll_free(mc.simple_poll);
1098
1099
if (gnutls_initalized){
1100
gnutls_certificate_free_credentials(mc.cred);
1101
gnutls_global_deinit ();
1102
gnutls_dh_params_deinit(mc.dh_params);
1103
}
1104
1105
if(gpgme_initalized){
1106
gpgme_release(mc.ctx);
1107
}
1108
1109
/* Removes the temp directory used by GPGME */
1110
if(tempdir[0] != '\0'){
1111
DIR *d;
1112
struct dirent *direntry;
1113
d = opendir(tempdir);
1114
if(d == NULL){
1115
perror("opendir");
1116
} else {
1117
while(true){
1118
direntry = readdir(d);
1119
if(direntry == NULL){
1120
break;
1121
}
1122
if (direntry->d_type == DT_REG){
1123
char *fullname = NULL;
1124
ret = asprintf(&fullname, "%s/%s", tempdir,
1125
direntry->d_name);
1126
if(ret < 0){
1127
perror("asprintf");
1128
continue;
1129
}
1130
ret = unlink(fullname);
1131
if(ret == -1){
1132
fprintf(stderr, "unlink(\"%s\"): %s",
1133
fullname, strerror(errno));
1134
}
1135
free(fullname);
1136
}
1137
}
1138
closedir(d);
1139
}
1140
ret = rmdir(tempdir);
1141
if(ret == -1){
1142
perror("rmdir");
1143
}
1144
}
1145
1146
return exitcode;
2117
2118
if(debug){
2119
fprintf(stderr, "%s exiting\n", argv[0]);
2120
}
2121
2122
/* Cleanup things */
2123
if(sb != NULL)
2124
avahi_s_service_browser_free(sb);
2125
2126
if(mc.server != NULL)
2127
avahi_server_free(mc.server);
2128
2129
if(mc.simple_poll != NULL)
2130
avahi_simple_poll_free(mc.simple_poll);
2131
2132
if(gnutls_initialized){
2133
gnutls_certificate_free_credentials(mc.cred);
2134
gnutls_global_deinit();
2135
gnutls_dh_params_deinit(mc.dh_params);
2136
}
2137
2138
if(gpgme_initialized){
2139
gpgme_release(mc.ctx);
2140
}
2141
2142
/* Cleans up the circular linked list of Mandos servers the client
2143
has seen */
2144
if(mc.current_server != NULL){
2145
mc.current_server->prev->next = NULL;
2146
while(mc.current_server != NULL){
2147
server *next = mc.current_server->next;
2148
free(mc.current_server);
2149
mc.current_server = next;
2150
}
2151
}
2152
2153
/* XXX run network hooks "stop" here */
2154
2155
/* Take down the network interface */
2156
if(take_down_interface){
2157
/* Re-raise priviliges */
2158
errno = 0;
2159
ret = seteuid(0);
2160
if(ret == -1){
2161
perror_plus("seteuid");
2162
}
2163
if(geteuid() == 0){
2164
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2165
if(ret == -1){
2166
perror_plus("ioctl SIOCGIFFLAGS");
2167
} else if(network.ifr_flags & IFF_UP) {
2168
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2169
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2170
if(ret == -1){
2171
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2172
}
2173
}
2174
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2175
if(ret == -1){
2176
perror_plus("close");
2177
}
2178
/* Lower privileges permanently */
2179
errno = 0;
2180
ret = setuid(uid);
2181
if(ret == -1){
2182
perror_plus("setuid");
2183
}
2184
}
2185
}
2186
2187
/* Removes the GPGME temp directory and all files inside */
2188
if(tempdir_created){
2189
struct dirent **direntries = NULL;
2190
struct dirent *direntry = NULL;
2191
int numentries = scandir(tempdir, &direntries, notdotentries,
2192
alphasort);
2193
if (numentries > 0){
2194
for(int i = 0; i < numentries; i++){
2195
direntry = direntries[i];
2196
char *fullname = NULL;
2197
ret = asprintf(&fullname, "%s/%s", tempdir,
2198
direntry->d_name);
2199
if(ret < 0){
2200
perror_plus("asprintf");
2201
continue;
2202
}
2203
ret = remove(fullname);
2204
if(ret == -1){
2205
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2206
strerror(errno));
2207
}
2208
free(fullname);
2209
}
2210
}
2211
2212
/* need to clean even if 0 because man page doesn't specify */
2213
free(direntries);
2214
if (numentries == -1){
2215
perror_plus("scandir");
2216
}
2217
ret = rmdir(tempdir);
2218
if(ret == -1 and errno != ENOENT){
2219
perror_plus("rmdir");
2220
}
2221
}
2222
2223
if(quit_now){
2224
sigemptyset(&old_sigterm_action.sa_mask);
2225
old_sigterm_action.sa_handler = SIG_DFL;
2226
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2227
&old_sigterm_action,
2228
NULL));
2229
if(ret == -1){
2230
perror_plus("sigaction");
2231
}
2232
do {
2233
ret = raise(signal_received);
2234
} while(ret != 0 and errno == EINTR);
2235
if(ret != 0){
2236
perror_plus("raise");
2237
abort();
2238
}
2239
TEMP_FAILURE_RETRY(pause());
2240
}
2241
2242
return exitcode;
1147
2243
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0