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- Committer: Teddy Hogeborn
- Date: 2011-11-11 09:10:58 UTC
- mto: (237.15.5 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 290.
- Revision ID: teddy@recompile.se-20111111091058-60y74fpjy2ce1c17
Intermediate commit - this does *not* work yet.
* plugins.d/mandos-client.c (HOOKDIR): New.
(up_interface): New.
(runnable_hook): New.
(main): Run network hooks with "start" argument.
* plugins.d/mandos-client.c (HOOKDIR): New.
(up_interface): New.
(runnable_hook): New.
(main): Run network hooks with "start" argument.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- 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
#define PUBKEY "pupkey.txt"
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 = "password-request 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
128
174
/*
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
175
* Make additional room in "buffer" for at least BUFFER_SIZE more
176
* bytes. "buffer_capacity" is how much is currently allocated,
131
177
* "buffer_length" is how much is already used.
132
178
*/
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
179
size_t incbuffer(char **buffer, size_t buffer_length,
134
180
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
181
if(buffer_length + BUFFER_SIZE > buffer_capacity){
136
182
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if (buffer == NULL){
183
if(buffer == NULL){
138
184
return 0;
139
185
}
140
186
buffer_capacity += BUFFER_SIZE;
142
188
return buffer_capacity;
143
189
}
144
190
191
/* Add server to set of servers to retry periodically */
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
194
int af){
195
int ret;
196
server *new_server = malloc(sizeof(server));
197
if(new_server == NULL){
198
perror_plus("malloc");
199
return -1;
200
}
201
*new_server = (server){ .ip = strdup(ip),
202
.port = port,
203
.if_index = if_index,
204
.af = af };
205
if(new_server->ip == NULL){
206
perror_plus("strdup");
207
return -1;
208
}
209
/* Special case of first server */
210
if (mc.current_server == NULL){
211
new_server->next = new_server;
212
new_server->prev = new_server;
213
mc.current_server = new_server;
214
/* Place the new server last in the list */
215
} else {
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
218
new_server->prev->next = new_server;
219
mc.current_server->prev = new_server;
220
}
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
222
if(ret == -1){
223
perror_plus("clock_gettime");
224
return -1;
225
}
226
return 0;
227
}
228
145
229
/*
146
230
* Initialize GPGME.
147
231
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
232
static bool init_gpgme(const char *seckey,
149
233
const char *pubkey, const char *tempdir){
150
int ret;
151
234
gpgme_error_t rc;
152
235
gpgme_engine_info_t engine_info;
153
236
154
237
155
238
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
239
* Helper function to insert pub and seckey to the engine keyring.
157
240
*/
158
241
bool import_key(const char *filename){
242
int ret;
159
243
int fd;
160
244
gpgme_data_t pgp_data;
161
245
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
246
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
247
if(fd == -1){
164
perror("open");
248
perror_plus("open");
165
249
return false;
166
250
}
167
251
168
252
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
if (rc != GPG_ERR_NO_ERROR){
253
if(rc != GPG_ERR_NO_ERROR){
170
254
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
255
gpgme_strsource(rc), gpgme_strerror(rc));
172
256
return false;
173
257
}
174
175
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if (rc != GPG_ERR_NO_ERROR){
258
259
rc = gpgme_op_import(mc.ctx, pgp_data);
260
if(rc != GPG_ERR_NO_ERROR){
177
261
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
262
gpgme_strsource(rc), gpgme_strerror(rc));
179
263
return false;
180
264
}
181
182
ret = TEMP_FAILURE_RETRY(close(fd));
265
266
ret = (int)TEMP_FAILURE_RETRY(close(fd));
183
267
if(ret == -1){
184
perror("close");
268
perror_plus("close");
185
269
}
186
270
gpgme_data_release(pgp_data);
187
271
return true;
188
272
}
189
273
190
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
274
if(debug){
275
fprintf(stderr, "Initializing GPGME\n");
192
276
}
193
277
194
278
/* Init GPGME */
195
279
gpgme_check_version(NULL);
196
280
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
if (rc != GPG_ERR_NO_ERROR){
281
if(rc != GPG_ERR_NO_ERROR){
198
282
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
283
gpgme_strsource(rc), gpgme_strerror(rc));
200
284
return false;
201
285
}
202
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){
286
287
/* Set GPGME home directory for the OpenPGP engine only */
288
rc = gpgme_get_engine_info(&engine_info);
289
if(rc != GPG_ERR_NO_ERROR){
206
290
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
291
gpgme_strsource(rc), gpgme_strerror(rc));
208
292
return false;
219
303
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
220
304
return false;
221
305
}
222
306
223
307
/* Create new GPGME "context" */
224
rc = gpgme_new(&(mc->ctx));
225
if (rc != GPG_ERR_NO_ERROR){
308
rc = gpgme_new(&(mc.ctx));
309
if(rc != GPG_ERR_NO_ERROR){
226
310
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
311
gpgme_strsource(rc), gpgme_strerror(rc));
228
312
return false;
229
313
}
230
314
231
if (not import_key(pubkey) or not import_key(seckey)){
315
if(not import_key(pubkey) or not import_key(seckey)){
232
316
return false;
233
317
}
234
318
235
return true;
319
return true;
236
320
}
237
321
238
322
/*
239
323
* Decrypt OpenPGP data.
240
324
* Returns -1 on error
241
325
*/
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
326
static ssize_t pgp_packet_decrypt(const char *cryptotext,
327
size_t crypto_size,
328
char **plaintext){
246
329
gpgme_data_t dh_crypto, dh_plain;
247
330
gpgme_error_t rc;
248
331
ssize_t ret;
249
332
size_t plaintext_capacity = 0;
250
333
ssize_t plaintext_length = 0;
251
334
252
if (debug){
335
if(debug){
253
336
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
254
337
}
255
338
256
339
/* Create new GPGME data buffer from memory cryptotext */
257
340
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
341
0);
259
if (rc != GPG_ERR_NO_ERROR){
342
if(rc != GPG_ERR_NO_ERROR){
260
343
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
344
gpgme_strsource(rc), gpgme_strerror(rc));
262
345
return -1;
264
347
265
348
/* Create new empty GPGME data buffer for the plaintext */
266
349
rc = gpgme_data_new(&dh_plain);
267
if (rc != GPG_ERR_NO_ERROR){
350
if(rc != GPG_ERR_NO_ERROR){
268
351
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
352
gpgme_strsource(rc), gpgme_strerror(rc));
270
353
gpgme_data_release(dh_crypto);
273
356
274
357
/* Decrypt data from the cryptotext data buffer to the plaintext
275
358
data buffer */
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if (rc != GPG_ERR_NO_ERROR){
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
360
if(rc != GPG_ERR_NO_ERROR){
278
361
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
362
gpgme_strsource(rc), gpgme_strerror(rc));
280
363
plaintext_length = -1;
281
if (debug){
364
if(debug){
282
365
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if (result == NULL){
366
result = gpgme_op_decrypt_result(mc.ctx);
367
if(result == NULL){
285
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
369
} else {
287
370
fprintf(stderr, "Unsupported algorithm: %s\n",
293
376
}
294
377
gpgme_recipient_t recipient;
295
378
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
}
379
while(recipient != NULL){
380
fprintf(stderr, "Public key algorithm: %s\n",
381
gpgme_pubkey_algo_name(recipient->pubkey_algo));
382
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
383
fprintf(stderr, "Secret key available: %s\n",
384
recipient->status == GPG_ERR_NO_SECKEY
385
? "No" : "Yes");
386
recipient = recipient->next;
306
387
}
307
388
}
308
389
}
314
395
}
315
396
316
397
/* 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("pgpme_data_seek");
398
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
399
perror_plus("gpgme_data_seek");
319
400
plaintext_length = -1;
320
401
goto decrypt_end;
321
402
}
322
403
323
404
*plaintext = NULL;
324
405
while(true){
325
plaintext_capacity = adjustbuffer(plaintext,
406
plaintext_capacity = incbuffer(plaintext,
326
407
(size_t)plaintext_length,
327
408
plaintext_capacity);
328
if (plaintext_capacity == 0){
329
perror("adjustbuffer");
409
if(plaintext_capacity == 0){
410
perror_plus("incbuffer");
330
411
plaintext_length = -1;
331
412
goto decrypt_end;
332
413
}
334
415
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
335
416
BUFFER_SIZE);
336
417
/* Print the data, if any */
337
if (ret == 0){
418
if(ret == 0){
338
419
/* EOF */
339
420
break;
340
421
}
341
422
if(ret < 0){
342
perror("gpgme_data_read");
423
perror_plus("gpgme_data_read");
343
424
plaintext_length = -1;
344
425
goto decrypt_end;
345
426
}
364
445
return plaintext_length;
365
446
}
366
447
367
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
369
if (ret == NULL)
448
static const char * safer_gnutls_strerror(int value){
449
const char *ret = gnutls_strerror(value); /* Spurious warning from
450
-Wunreachable-code */
451
if(ret == NULL)
370
452
ret = "(unknown)";
371
453
return ret;
372
454
}
377
459
fprintf(stderr, "GnuTLS: %s", string);
378
460
}
379
461
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
462
static int init_gnutls_global(const char *pubkeyfilename,
382
463
const char *seckeyfilename){
383
464
int ret;
384
465
387
468
}
388
469
389
470
ret = gnutls_global_init();
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
471
if(ret != GNUTLS_E_SUCCESS){
472
fprintf(stderr, "GnuTLS global_init: %s\n",
473
safer_gnutls_strerror(ret));
393
474
return -1;
394
475
}
395
476
396
if (debug){
477
if(debug){
397
478
/* "Use a log level over 10 to enable all debugging options."
398
479
* - GnuTLS manual
399
480
*/
402
483
}
403
484
404
485
/* 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 ();
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
487
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "GnuTLS memory error: %s\n",
489
safer_gnutls_strerror(ret));
490
gnutls_global_deinit();
411
491
return -1;
412
492
}
413
493
418
498
}
419
499
420
500
ret = gnutls_certificate_set_openpgp_key_file
421
(mc->cred, pubkeyfilename, seckeyfilename,
501
(mc.cred, pubkeyfilename, seckeyfilename,
422
502
GNUTLS_OPENPGP_FMT_BASE64);
423
if (ret != GNUTLS_E_SUCCESS) {
503
if(ret != GNUTLS_E_SUCCESS){
424
504
fprintf(stderr,
425
505
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
506
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
430
510
}
431
511
432
512
/* 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));
513
ret = gnutls_dh_params_init(&mc.dh_params);
514
if(ret != GNUTLS_E_SUCCESS){
515
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
516
" %s\n", safer_gnutls_strerror(ret));
437
517
goto globalfail;
438
518
}
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));
519
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
520
if(ret != GNUTLS_E_SUCCESS){
521
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
522
safer_gnutls_strerror(ret));
443
523
goto globalfail;
444
524
}
445
525
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
526
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
447
527
448
528
return 0;
449
529
450
530
globalfail:
451
531
452
gnutls_certificate_free_credentials(mc->cred);
532
gnutls_certificate_free_credentials(mc.cred);
453
533
gnutls_global_deinit();
534
gnutls_dh_params_deinit(mc.dh_params);
454
535
return -1;
455
536
}
456
537
457
static int init_gnutls_session(mandos_context *mc,
458
gnutls_session_t *session){
538
static int init_gnutls_session(gnutls_session_t *session){
459
539
int ret;
460
540
/* GnuTLS session creation */
461
ret = gnutls_init(session, GNUTLS_SERVER);
462
if (ret != GNUTLS_E_SUCCESS){
541
do {
542
ret = gnutls_init(session, GNUTLS_SERVER);
543
if(quit_now){
544
return -1;
545
}
546
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
547
if(ret != GNUTLS_E_SUCCESS){
463
548
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
464
549
safer_gnutls_strerror(ret));
465
550
}
466
551
467
552
{
468
553
const char *err;
469
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
470
if (ret != GNUTLS_E_SUCCESS) {
554
do {
555
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
556
if(quit_now){
557
gnutls_deinit(*session);
558
return -1;
559
}
560
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
561
if(ret != GNUTLS_E_SUCCESS){
471
562
fprintf(stderr, "Syntax error at: %s\n", err);
472
563
fprintf(stderr, "GnuTLS error: %s\n",
473
564
safer_gnutls_strerror(ret));
474
gnutls_deinit (*session);
565
gnutls_deinit(*session);
475
566
return -1;
476
567
}
477
568
}
478
569
479
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
480
mc->cred);
481
if (ret != GNUTLS_E_SUCCESS) {
570
do {
571
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
572
mc.cred);
573
if(quit_now){
574
gnutls_deinit(*session);
575
return -1;
576
}
577
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
578
if(ret != GNUTLS_E_SUCCESS){
482
579
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
483
580
safer_gnutls_strerror(ret));
484
gnutls_deinit (*session);
581
gnutls_deinit(*session);
485
582
return -1;
486
583
}
487
584
488
585
/* ignore client certificate if any. */
489
gnutls_certificate_server_set_request (*session,
490
GNUTLS_CERT_IGNORE);
586
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
491
587
492
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
588
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
493
589
494
590
return 0;
495
591
}
501
597
/* Called when a Mandos server is found */
502
598
static int start_mandos_communication(const char *ip, uint16_t port,
503
599
AvahiIfIndex if_index,
504
mandos_context *mc){
505
int ret, tcp_sd;
506
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
600
int af){
601
int ret, tcp_sd = -1;
602
ssize_t sret;
603
union {
604
struct sockaddr_in in;
605
struct sockaddr_in6 in6;
606
} to;
507
607
char *buffer = NULL;
508
char *decrypted_buffer;
608
char *decrypted_buffer = NULL;
509
609
size_t buffer_length = 0;
510
610
size_t buffer_capacity = 0;
511
ssize_t decrypted_buffer_size;
512
611
size_t written;
513
int retval = 0;
514
char interface[IF_NAMESIZE];
612
int retval = -1;
515
613
gnutls_session_t session;
516
517
ret = init_gnutls_session (mc, &session);
518
if (ret != 0){
614
int pf; /* Protocol family */
615
616
errno = 0;
617
618
if(quit_now){
619
errno = EINTR;
620
return -1;
621
}
622
623
switch(af){
624
case AF_INET6:
625
pf = PF_INET6;
626
break;
627
case AF_INET:
628
pf = PF_INET;
629
break;
630
default:
631
fprintf(stderr, "Bad address family: %d\n", af);
632
errno = EINVAL;
633
return -1;
634
}
635
636
ret = init_gnutls_session(&session);
637
if(ret != 0){
519
638
return -1;
520
639
}
521
640
522
641
if(debug){
523
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
524
643
"\n", ip, port);
525
644
}
526
645
527
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
528
if(tcp_sd < 0) {
529
perror("socket");
530
return -1;
646
tcp_sd = socket(pf, SOCK_STREAM, 0);
647
if(tcp_sd < 0){
648
int e = errno;
649
perror_plus("socket");
650
errno = e;
651
goto mandos_end;
531
652
}
532
653
533
if(debug){
534
if(if_indextoname((unsigned int)if_index, interface) == NULL){
535
perror("if_indextoname");
536
return -1;
537
}
538
fprintf(stderr, "Binding to interface %s\n", interface);
654
if(quit_now){
655
errno = EINTR;
656
goto mandos_end;
539
657
}
540
658
541
659
memset(&to, 0, sizeof(to));
542
to.in6.sin6_family = AF_INET6;
543
/* It would be nice to have a way to detect if we were passed an
544
IPv4 address here. Now we assume an IPv6 address. */
545
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
546
if (ret < 0 ){
547
perror("inet_pton");
548
return -1;
660
if(af == AF_INET6){
661
to.in6.sin6_family = (sa_family_t)af;
662
ret = inet_pton(af, ip, &to.in6.sin6_addr);
663
} else { /* IPv4 */
664
to.in.sin_family = (sa_family_t)af;
665
ret = inet_pton(af, ip, &to.in.sin_addr);
666
}
667
if(ret < 0 ){
668
int e = errno;
669
perror_plus("inet_pton");
670
errno = e;
671
goto mandos_end;
549
672
}
550
673
if(ret == 0){
674
int e = errno;
551
675
fprintf(stderr, "Bad address: %s\n", ip);
552
return -1;
553
}
554
to.in6.sin6_port = htons(port); /* Spurious warning */
676
errno = e;
677
goto mandos_end;
678
}
679
if(af == AF_INET6){
680
to.in6.sin6_port = htons(port); /* Spurious warnings from
681
-Wconversion and
682
-Wunreachable-code */
683
684
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
685
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
686
-Wunreachable-code*/
687
if(if_index == AVAHI_IF_UNSPEC){
688
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
" without a network interface\n");
690
errno = EINVAL;
691
goto mandos_end;
692
}
693
/* Set the network interface number as scope */
694
to.in6.sin6_scope_id = (uint32_t)if_index;
695
}
696
} else {
697
to.in.sin_port = htons(port); /* Spurious warnings from
698
-Wconversion and
699
-Wunreachable-code */
700
}
555
701
556
to.in6.sin6_scope_id = (uint32_t)if_index;
702
if(quit_now){
703
errno = EINTR;
704
goto mandos_end;
705
}
557
706
558
707
if(debug){
559
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
560
port);
561
char addrstr[INET6_ADDRSTRLEN] = "";
562
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
563
sizeof(addrstr)) == NULL){
564
perror("inet_ntop");
708
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
709
char interface[IF_NAMESIZE];
710
if(if_indextoname((unsigned int)if_index, interface) == NULL){
711
perror_plus("if_indextoname");
712
} else {
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
715
}
716
} else {
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
718
port);
719
}
720
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
721
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
722
const char *pcret;
723
if(af == AF_INET6){
724
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
725
sizeof(addrstr));
726
} else {
727
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
728
sizeof(addrstr));
729
}
730
if(pcret == NULL){
731
perror_plus("inet_ntop");
565
732
} else {
566
733
if(strcmp(addrstr, ip) != 0){
567
734
fprintf(stderr, "Canonical address form: %s\n", addrstr);
569
736
}
570
737
}
571
738
572
ret = connect(tcp_sd, &to.in, sizeof(to));
573
if (ret < 0){
574
perror("connect");
575
return -1;
739
if(quit_now){
740
errno = EINTR;
741
goto mandos_end;
742
}
743
744
if(af == AF_INET6){
745
ret = connect(tcp_sd, &to.in6, sizeof(to));
746
} else {
747
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
748
}
749
if(ret < 0){
750
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
751
int e = errno;
752
perror_plus("connect");
753
errno = e;
754
}
755
goto mandos_end;
756
}
757
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
576
761
}
577
762
578
763
const char *out = mandos_protocol_version;
579
764
written = 0;
580
while (true){
765
while(true){
581
766
size_t out_size = strlen(out);
582
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
767
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
583
768
out_size - written));
584
if (ret == -1){
585
perror("write");
586
retval = -1;
769
if(ret == -1){
770
int e = errno;
771
perror_plus("write");
772
errno = e;
587
773
goto mandos_end;
588
774
}
589
775
written += (size_t)ret;
590
776
if(written < out_size){
591
777
continue;
592
778
} else {
593
if (out == mandos_protocol_version){
779
if(out == mandos_protocol_version){
594
780
written = 0;
595
781
out = "\r\n";
596
782
} else {
597
783
break;
598
784
}
599
785
}
786
787
if(quit_now){
788
errno = EINTR;
789
goto mandos_end;
790
}
600
791
}
601
792
602
793
if(debug){
603
794
fprintf(stderr, "Establishing TLS session with %s\n", ip);
604
795
}
605
796
606
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
607
608
do{
609
ret = gnutls_handshake (session);
797
if(quit_now){
798
errno = EINTR;
799
goto mandos_end;
800
}
801
802
/* Spurious warning from -Wint-to-pointer-cast */
803
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
804
805
if(quit_now){
806
errno = EINTR;
807
goto mandos_end;
808
}
809
810
do {
811
ret = gnutls_handshake(session);
812
if(quit_now){
813
errno = EINTR;
814
goto mandos_end;
815
}
610
816
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
611
817
612
if (ret != GNUTLS_E_SUCCESS){
818
if(ret != GNUTLS_E_SUCCESS){
613
819
if(debug){
614
820
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
615
gnutls_perror (ret);
821
gnutls_perror(ret);
616
822
}
617
retval = -1;
823
errno = EPROTO;
618
824
goto mandos_end;
619
825
}
620
826
621
827
/* Read OpenPGP packet that contains the wanted password */
622
828
623
829
if(debug){
624
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
830
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
625
831
ip);
626
832
}
627
833
628
834
while(true){
629
buffer_capacity = adjustbuffer(&buffer, buffer_length,
835
836
if(quit_now){
837
errno = EINTR;
838
goto mandos_end;
839
}
840
841
buffer_capacity = incbuffer(&buffer, buffer_length,
630
842
buffer_capacity);
631
if (buffer_capacity == 0){
632
perror("adjustbuffer");
633
retval = -1;
634
goto mandos_end;
635
}
636
637
ret = gnutls_record_recv(session, buffer+buffer_length,
638
BUFFER_SIZE);
639
if (ret == 0){
843
if(buffer_capacity == 0){
844
int e = errno;
845
perror_plus("incbuffer");
846
errno = e;
847
goto mandos_end;
848
}
849
850
if(quit_now){
851
errno = EINTR;
852
goto mandos_end;
853
}
854
855
sret = gnutls_record_recv(session, buffer+buffer_length,
856
BUFFER_SIZE);
857
if(sret == 0){
640
858
break;
641
859
}
642
if (ret < 0){
643
switch(ret){
860
if(sret < 0){
861
switch(sret){
644
862
case GNUTLS_E_INTERRUPTED:
645
863
case GNUTLS_E_AGAIN:
646
864
break;
647
865
case GNUTLS_E_REHANDSHAKE:
648
do{
649
ret = gnutls_handshake (session);
866
do {
867
ret = gnutls_handshake(session);
868
869
if(quit_now){
870
errno = EINTR;
871
goto mandos_end;
872
}
650
873
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
651
if (ret < 0){
874
if(ret < 0){
652
875
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
653
gnutls_perror (ret);
654
retval = -1;
876
gnutls_perror(ret);
877
errno = EPROTO;
655
878
goto mandos_end;
656
879
}
657
880
break;
658
881
default:
659
882
fprintf(stderr, "Unknown error while reading data from"
660
883
" encrypted session with Mandos server\n");
661
retval = -1;
662
gnutls_bye (session, GNUTLS_SHUT_RDWR);
884
gnutls_bye(session, GNUTLS_SHUT_RDWR);
885
errno = EIO;
663
886
goto mandos_end;
664
887
}
665
888
} else {
666
buffer_length += (size_t) ret;
889
buffer_length += (size_t) sret;
667
890
}
668
891
}
669
892
671
894
fprintf(stderr, "Closing TLS session\n");
672
895
}
673
896
674
gnutls_bye (session, GNUTLS_SHUT_RDWR);
675
676
if (buffer_length > 0){
677
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
897
if(quit_now){
898
errno = EINTR;
899
goto mandos_end;
900
}
901
902
do {
903
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
904
if(quit_now){
905
errno = EINTR;
906
goto mandos_end;
907
}
908
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
909
910
if(buffer_length > 0){
911
ssize_t decrypted_buffer_size;
912
decrypted_buffer_size = pgp_packet_decrypt(buffer,
678
913
buffer_length,
679
914
&decrypted_buffer);
680
if (decrypted_buffer_size >= 0){
915
if(decrypted_buffer_size >= 0){
916
681
917
written = 0;
682
918
while(written < (size_t) decrypted_buffer_size){
683
ret = (int)fwrite (decrypted_buffer + written, 1,
684
(size_t)decrypted_buffer_size - written,
685
stdout);
919
if(quit_now){
920
errno = EINTR;
921
goto mandos_end;
922
}
923
924
ret = (int)fwrite(decrypted_buffer + written, 1,
925
(size_t)decrypted_buffer_size - written,
926
stdout);
686
927
if(ret == 0 and ferror(stdout)){
928
int e = errno;
687
929
if(debug){
688
930
fprintf(stderr, "Error writing encrypted data: %s\n",
689
931
strerror(errno));
690
932
}
691
retval = -1;
692
break;
933
errno = e;
934
goto mandos_end;
693
935
}
694
936
written += (size_t)ret;
695
937
}
696
free(decrypted_buffer);
697
} else {
698
retval = -1;
938
retval = 0;
699
939
}
700
} else {
701
retval = -1;
702
940
}
703
941
704
942
/* Shutdown procedure */
705
943
706
944
mandos_end:
707
free(buffer);
708
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
709
if(ret == -1){
710
perror("close");
945
{
946
int e = errno;
947
free(decrypted_buffer);
948
free(buffer);
949
if(tcp_sd >= 0){
950
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
951
}
952
if(ret == -1){
953
if(e == 0){
954
e = errno;
955
}
956
perror_plus("close");
957
}
958
gnutls_deinit(session);
959
errno = e;
960
if(quit_now){
961
errno = EINTR;
962
retval = -1;
963
}
711
964
}
712
gnutls_deinit (session);
713
965
return retval;
714
966
}
715
967
716
968
static void resolve_callback(AvahiSServiceResolver *r,
717
969
AvahiIfIndex interface,
718
AVAHI_GCC_UNUSED AvahiProtocol protocol,
970
AvahiProtocol proto,
719
971
AvahiResolverEvent event,
720
972
const char *name,
721
973
const char *type,
726
978
AVAHI_GCC_UNUSED AvahiStringList *txt,
727
979
AVAHI_GCC_UNUSED AvahiLookupResultFlags
728
980
flags,
729
void* userdata) {
730
mandos_context *mc = userdata;
981
AVAHI_GCC_UNUSED void* userdata){
731
982
assert(r);
732
983
733
984
/* Called whenever a service has been resolved successfully or
734
985
timed out */
735
986
736
switch (event) {
987
if(quit_now){
988
return;
989
}
990
991
switch(event){
737
992
default:
738
993
case AVAHI_RESOLVER_FAILURE:
739
994
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
740
995
" of type '%s' in domain '%s': %s\n", name, type, domain,
741
avahi_strerror(avahi_server_errno(mc->server)));
996
avahi_strerror(avahi_server_errno(mc.server)));
742
997
break;
743
998
744
999
case AVAHI_RESOLVER_FOUND:
747
1002
avahi_address_snprint(ip, sizeof(ip), address);
748
1003
if(debug){
749
1004
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
750
PRIu16 ") on port %d\n", name, host_name, ip,
751
interface, port);
1005
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1006
ip, (intmax_t)interface, port);
752
1007
}
753
int ret = start_mandos_communication(ip, port, interface, mc);
754
if (ret == 0){
755
avahi_simple_poll_quit(mc->simple_poll);
1008
int ret = start_mandos_communication(ip, port, interface,
1009
avahi_proto_to_af(proto));
1010
if(ret == 0){
1011
avahi_simple_poll_quit(mc.simple_poll);
1012
} else {
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
756
1015
}
757
1016
}
758
1017
}
759
1018
avahi_s_service_resolver_free(r);
760
1019
}
761
1020
762
static void browse_callback( AvahiSServiceBrowser *b,
763
AvahiIfIndex interface,
764
AvahiProtocol protocol,
765
AvahiBrowserEvent event,
766
const char *name,
767
const char *type,
768
const char *domain,
769
AVAHI_GCC_UNUSED AvahiLookupResultFlags
770
flags,
771
void* userdata) {
772
mandos_context *mc = userdata;
1021
static void browse_callback(AvahiSServiceBrowser *b,
1022
AvahiIfIndex interface,
1023
AvahiProtocol protocol,
1024
AvahiBrowserEvent event,
1025
const char *name,
1026
const char *type,
1027
const char *domain,
1028
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1029
flags,
1030
AVAHI_GCC_UNUSED void* userdata){
773
1031
assert(b);
774
1032
775
1033
/* Called whenever a new services becomes available on the LAN or
776
1034
is removed from the LAN */
777
1035
778
switch (event) {
1036
if(quit_now){
1037
return;
1038
}
1039
1040
switch(event){
779
1041
default:
780
1042
case AVAHI_BROWSER_FAILURE:
781
1043
782
1044
fprintf(stderr, "(Avahi browser) %s\n",
783
avahi_strerror(avahi_server_errno(mc->server)));
784
avahi_simple_poll_quit(mc->simple_poll);
1045
avahi_strerror(avahi_server_errno(mc.server)));
1046
avahi_simple_poll_quit(mc.simple_poll);
785
1047
return;
786
1048
787
1049
case AVAHI_BROWSER_NEW:
790
1052
the callback function is called the Avahi server will free the
791
1053
resolver for us. */
792
1054
793
if (!(avahi_s_service_resolver_new(mc->server, interface,
794
protocol, name, type, domain,
795
AVAHI_PROTO_INET6, 0,
796
resolve_callback, mc)))
1055
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1056
name, type, domain, protocol, 0,
1057
resolve_callback, NULL) == NULL)
797
1058
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
798
name, avahi_strerror(avahi_server_errno(mc->server)));
1059
name, avahi_strerror(avahi_server_errno(mc.server)));
799
1060
break;
800
1061
801
1062
case AVAHI_BROWSER_REMOVE:
810
1071
}
811
1072
}
812
1073
1074
/* Signal handler that stops main loop after SIGTERM */
1075
static void handle_sigterm(int sig){
1076
if(quit_now){
1077
return;
1078
}
1079
quit_now = 1;
1080
signal_received = sig;
1081
int old_errno = errno;
1082
/* set main loop to exit */
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1085
}
1086
errno = old_errno;
1087
}
1088
1089
bool get_flags(const char *ifname, struct ifreq *ifr){
1090
int ret;
1091
1092
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1093
if(s < 0){
1094
perror_plus("socket");
1095
return false;
1096
}
1097
strcpy(ifr->ifr_name, ifname);
1098
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1099
if(ret == -1){
1100
if(debug){
1101
perror_plus("ioctl SIOCGIFFLAGS");
1102
}
1103
return false;
1104
}
1105
return true;
1106
}
1107
1108
bool good_flags(const char *ifname, const struct ifreq *ifr){
1109
1110
/* Reject the loopback device */
1111
if(ifr->ifr_flags & IFF_LOOPBACK){
1112
if(debug){
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1115
}
1116
return false;
1117
}
1118
/* Accept point-to-point devices only if connect_to is specified */
1119
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1120
if(debug){
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1123
}
1124
return true;
1125
}
1126
/* Otherwise, reject non-broadcast-capable devices */
1127
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1128
if(debug){
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1131
}
1132
return false;
1133
}
1134
/* Reject non-ARP interfaces (including dummy interfaces) */
1135
if(ifr->ifr_flags & IFF_NOARP){
1136
if(debug){
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1138
}
1139
return false;
1140
}
1141
1142
/* Accept this device */
1143
if(debug){
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1145
}
1146
return true;
1147
}
1148
1149
/*
1150
* This function determines if a directory entry in /sys/class/net
1151
* corresponds to an acceptable network device.
1152
* (This function is passed to scandir(3) as a filter function.)
1153
*/
1154
int good_interface(const struct dirent *if_entry){
1155
int ret;
1156
if(if_entry->d_name[0] == '.'){
1157
return 0;
1158
}
1159
struct ifreq ifr;
1160
1161
if(not get_flags(if_entry->d_name, &ifr)){
1162
return 0;
1163
}
1164
1165
if(not good_flags(if_entry->d_name, &ifr)){
1166
return 0;
1167
}
1168
return 1;
1169
}
1170
1171
/*
1172
* This function determines if a directory entry in /sys/class/net
1173
* corresponds to an acceptable network device which is up.
1174
* (This function is passed to scandir(3) as a filter function.)
1175
*/
1176
int up_interface(const struct dirent *if_entry){
1177
ssize_t ssret;
1178
char *flagname = NULL;
1179
if(if_entry->d_name[0] == '.'){
1180
return 0;
1181
}
1182
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1183
if_entry->d_name);
1184
if(ret < 0){
1185
perror_plus("asprintf");
1186
return 0;
1187
}
1188
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1189
if(flags_fd == -1){
1190
perror_plus("open");
1191
free(flagname);
1192
return 0;
1193
}
1194
free(flagname);
1195
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1196
/* read line from flags_fd */
1197
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1198
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1199
flagstring[(size_t)to_read] = '\0';
1200
if(flagstring == NULL){
1201
perror_plus("malloc");
1202
close(flags_fd);
1203
return 0;
1204
}
1205
while(to_read > 0){
1206
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1207
(size_t)to_read));
1208
if(ssret == -1){
1209
perror_plus("read");
1210
free(flagstring);
1211
close(flags_fd);
1212
return 0;
1213
}
1214
to_read -= ssret;
1215
if(ssret == 0){
1216
break;
1217
}
1218
}
1219
close(flags_fd);
1220
intmax_t tmpmax;
1221
char *tmp;
1222
errno = 0;
1223
tmpmax = strtoimax(flagstring, &tmp, 0);
1224
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1225
and not (isspace(*tmp)))
1226
or tmpmax != (ifreq_flags)tmpmax){
1227
if(debug){
1228
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1229
flagstring, if_entry->d_name);
1230
}
1231
free(flagstring);
1232
return 0;
1233
}
1234
free(flagstring);
1235
ifreq_flags flags = (ifreq_flags)tmpmax;
1236
/* Reject the loopback device */
1237
if(flags & IFF_LOOPBACK){
1238
if(debug){
1239
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1240
if_entry->d_name);
1241
}
1242
return 0;
1243
}
1244
1245
/* Reject down interfaces */
1246
if(not (flags & IFF_UP)){
1247
return 0;
1248
}
1249
1250
/* Accept point-to-point devices only if connect_to is specified */
1251
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1252
if(debug){
1253
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1254
if_entry->d_name);
1255
}
1256
return 1;
1257
}
1258
/* Otherwise, reject non-broadcast-capable devices */
1259
if(not (flags & IFF_BROADCAST)){
1260
if(debug){
1261
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1262
if_entry->d_name);
1263
}
1264
return 0;
1265
}
1266
/* Reject non-ARP interfaces (including dummy interfaces) */
1267
if(flags & IFF_NOARP){
1268
if(debug){
1269
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1270
if_entry->d_name);
1271
}
1272
return 0;
1273
}
1274
/* Accept this device */
1275
if(debug){
1276
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1277
if_entry->d_name);
1278
}
1279
return 1;
1280
}
1281
1282
int notdotentries(const struct dirent *direntry){
1283
/* Skip "." and ".." */
1284
if(direntry->d_name[0] == '.'
1285
and (direntry->d_name[1] == '\0'
1286
or (direntry->d_name[1] == '.'
1287
and direntry->d_name[2] == '\0'))){
1288
return 0;
1289
}
1290
return 1;
1291
}
1292
1293
/* Is this directory entry a runnable program? */
1294
int runnable_hook(const struct dirent *direntry){
1295
int ret;
1296
struct stat st;
1297
1298
if((direntry->d_name)[0] == '\0'){
1299
/* Empty name? */
1300
return 0;
1301
}
1302
1303
/* Save pointer to last character */
1304
char *end = strchr(direntry->d_name, '\0')-1;
1305
1306
if(*end == '~'){
1307
/* Backup name~ */
1308
return 0;
1309
}
1310
1311
if(((direntry->d_name)[0] == '#')
1312
and (*end == '#')){
1313
/* Temporary #name# */
1314
return 0;
1315
}
1316
1317
/* XXX more rules here */
1318
1319
ret = stat(direntry->d_name, &st);
1320
if(ret == -1){
1321
if(debug){
1322
perror_plus("Could not stat plugin");
1323
}
1324
return 0;
1325
}
1326
if(not (st.st_mode & S_ISREG)){
1327
/* Not a regular file */
1328
return 0;
1329
}
1330
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1331
/* Not executable */
1332
return 0;
1333
}
1334
return 1;
1335
}
1336
1337
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1338
int ret;
1339
struct timespec now;
1340
struct timespec waited_time;
1341
intmax_t block_time;
1342
1343
while(true){
1344
if(mc.current_server == NULL){
1345
if (debug){
1346
fprintf(stderr,
1347
"Wait until first server is found. No timeout!\n");
1348
}
1349
ret = avahi_simple_poll_iterate(s, -1);
1350
} else {
1351
if (debug){
1352
fprintf(stderr, "Check current_server if we should run it,"
1353
" or wait\n");
1354
}
1355
/* the current time */
1356
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1357
if(ret == -1){
1358
perror_plus("clock_gettime");
1359
return -1;
1360
}
1361
/* Calculating in ms how long time between now and server
1362
who we visted longest time ago. Now - last seen. */
1363
waited_time.tv_sec = (now.tv_sec
1364
- mc.current_server->last_seen.tv_sec);
1365
waited_time.tv_nsec = (now.tv_nsec
1366
- mc.current_server->last_seen.tv_nsec);
1367
/* total time is 10s/10,000ms.
1368
Converting to s from ms by dividing by 1,000,
1369
and ns to ms by dividing by 1,000,000. */
1370
block_time = ((retry_interval
1371
- ((intmax_t)waited_time.tv_sec * 1000))
1372
- ((intmax_t)waited_time.tv_nsec / 1000000));
1373
1374
if (debug){
1375
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1376
}
1377
1378
if(block_time <= 0){
1379
ret = start_mandos_communication(mc.current_server->ip,
1380
mc.current_server->port,
1381
mc.current_server->if_index,
1382
mc.current_server->af);
1383
if(ret == 0){
1384
avahi_simple_poll_quit(mc.simple_poll);
1385
return 0;
1386
}
1387
ret = clock_gettime(CLOCK_MONOTONIC,
1388
&mc.current_server->last_seen);
1389
if(ret == -1){
1390
perror_plus("clock_gettime");
1391
return -1;
1392
}
1393
mc.current_server = mc.current_server->next;
1394
block_time = 0; /* Call avahi to find new Mandos
1395
servers, but don't block */
1396
}
1397
1398
ret = avahi_simple_poll_iterate(s, (int)block_time);
1399
}
1400
if(ret != 0){
1401
if (ret > 0 or errno != EINTR) {
1402
return (ret != 1) ? ret : 0;
1403
}
1404
}
1405
}
1406
}
1407
813
1408
int main(int argc, char *argv[]){
814
AvahiSServiceBrowser *sb = NULL;
815
int error;
816
int ret;
817
int exitcode = EXIT_SUCCESS;
818
const char *interface = "eth0";
819
struct ifreq network;
820
int sd;
821
uid_t uid;
822
gid_t gid;
823
char *connect_to = NULL;
824
char tempdir[] = "/tmp/mandosXXXXXX";
825
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
826
const char *seckey = PATHDIR "/" SECKEY;
827
const char *pubkey = PATHDIR "/" PUBKEY;
828
829
mandos_context mc = { .simple_poll = NULL, .server = NULL,
830
.dh_bits = 1024, .priority = "SECURE256"
831
":!CTYPE-X.509:+CTYPE-OPENPGP" };
832
bool gnutls_initalized = false;
833
bool pgpme_initalized = false;
834
835
{
836
struct argp_option options[] = {
837
{ .name = "debug", .key = 128,
838
.doc = "Debug mode", .group = 3 },
839
{ .name = "connect", .key = 'c',
840
.arg = "ADDRESS:PORT",
841
.doc = "Connect directly to a specific Mandos server",
842
.group = 1 },
843
{ .name = "interface", .key = 'i',
844
.arg = "NAME",
845
.doc = "Interface that will be used to search for Mandos"
846
" servers",
847
.group = 1 },
848
{ .name = "seckey", .key = 's',
849
.arg = "FILE",
850
.doc = "OpenPGP secret key file base name",
851
.group = 1 },
852
{ .name = "pubkey", .key = 'p',
853
.arg = "FILE",
854
.doc = "OpenPGP public key file base name",
855
.group = 2 },
856
{ .name = "dh-bits", .key = 129,
857
.arg = "BITS",
858
.doc = "Bit length of the prime number used in the"
859
" Diffie-Hellman key exchange",
860
.group = 2 },
861
{ .name = "priority", .key = 130,
862
.arg = "STRING",
863
.doc = "GnuTLS priority string for the TLS handshake",
864
.group = 1 },
865
{ .name = NULL }
866
};
867
868
error_t parse_opt (int key, char *arg,
869
struct argp_state *state) {
870
/* Get the INPUT argument from `argp_parse', which we know is
871
a pointer to our plugin list pointer. */
872
switch (key) {
873
case 128: /* --debug */
874
debug = true;
875
break;
876
case 'c': /* --connect */
877
connect_to = arg;
878
break;
879
case 'i': /* --interface */
880
interface = arg;
881
break;
882
case 's': /* --seckey */
883
seckey = arg;
884
break;
885
case 'p': /* --pubkey */
886
pubkey = arg;
887
break;
888
case 129: /* --dh-bits */
889
errno = 0;
890
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
891
if (errno){
892
perror("strtol");
893
exit(EXIT_FAILURE);
894
}
895
break;
896
case 130: /* --priority */
897
mc.priority = arg;
898
break;
899
case ARGP_KEY_ARG:
900
argp_usage (state);
901
case ARGP_KEY_END:
902
break;
903
default:
904
return ARGP_ERR_UNKNOWN;
905
}
906
return 0;
907
}
908
909
struct argp argp = { .options = options, .parser = parse_opt,
910
.args_doc = "",
911
.doc = "Mandos client -- Get and decrypt"
912
" passwords from a Mandos server" };
913
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
914
if (ret == ARGP_ERR_UNKNOWN){
915
fprintf(stderr, "Unknown error while parsing arguments\n");
916
exitcode = EXIT_FAILURE;
917
goto end;
918
}
919
}
920
921
ret = init_gnutls_global(&mc, pubkey, seckey);
922
if (ret == -1){
923
fprintf(stderr, "init_gnutls_global failed\n");
924
exitcode = EXIT_FAILURE;
925
goto end;
926
} else {
927
gnutls_initalized = true;
928
}
929
930
if(mkdtemp(tempdir) == NULL){
931
perror("mkdtemp");
932
tempdir[0] = '\0';
933
goto end;
934
}
935
936
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
937
fprintf(stderr, "pgpme_initalized failed\n");
938
exitcode = EXIT_FAILURE;
939
goto end;
940
} else {
941
pgpme_initalized = true;
942
}
943
944
/* If the interface is down, bring it up */
945
{
946
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
947
if(sd < 0) {
948
perror("socket");
949
exitcode = EXIT_FAILURE;
950
goto end;
951
}
952
strcpy(network.ifr_name, interface);
953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
954
if(ret == -1){
955
perror("ioctl SIOCGIFFLAGS");
956
exitcode = EXIT_FAILURE;
957
goto end;
958
}
959
if((network.ifr_flags & IFF_UP) == 0){
960
network.ifr_flags |= IFF_UP;
961
ret = ioctl(sd, SIOCSIFFLAGS, &network);
962
if(ret == -1){
963
perror("ioctl SIOCSIFFLAGS");
964
exitcode = EXIT_FAILURE;
965
goto end;
966
}
967
}
968
ret = TEMP_FAILURE_RETRY(close(sd));
969
if(ret == -1){
970
perror("close");
971
}
972
}
973
974
uid = getuid();
975
gid = getgid();
976
977
ret = setuid(uid);
978
if (ret == -1){
979
perror("setuid");
980
}
981
982
setgid(gid);
983
if (ret == -1){
984
perror("setgid");
985
}
986
1409
AvahiSServiceBrowser *sb = NULL;
1410
int error;
1411
int ret;
1412
intmax_t tmpmax;
1413
char *tmp;
1414
int exitcode = EXIT_SUCCESS;
1415
const char *interface = "";
1416
struct ifreq network;
1417
int sd = -1;
1418
bool take_down_interface = false;
1419
uid_t uid;
1420
gid_t gid;
1421
char tempdir[] = "/tmp/mandosXXXXXX";
1422
bool tempdir_created = false;
1423
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1424
const char *seckey = PATHDIR "/" SECKEY;
1425
const char *pubkey = PATHDIR "/" PUBKEY;
1426
1427
bool gnutls_initialized = false;
1428
bool gpgme_initialized = false;
1429
float delay = 2.5f;
1430
double retry_interval = 10; /* 10s between trying a server and
1431
retrying the same server again */
1432
1433
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1434
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1435
1436
uid = getuid();
1437
gid = getgid();
1438
1439
/* Lower any group privileges we might have, just to be safe */
1440
errno = 0;
1441
ret = setgid(gid);
1442
if(ret == -1){
1443
perror_plus("setgid");
1444
}
1445
1446
/* Lower user privileges (temporarily) */
1447
errno = 0;
1448
ret = seteuid(uid);
1449
if(ret == -1){
1450
perror_plus("seteuid");
1451
}
1452
1453
if(quit_now){
1454
goto end;
1455
}
1456
1457
{
1458
struct argp_option options[] = {
1459
{ .name = "debug", .key = 128,
1460
.doc = "Debug mode", .group = 3 },
1461
{ .name = "connect", .key = 'c',
1462
.arg = "ADDRESS:PORT",
1463
.doc = "Connect directly to a specific Mandos server",
1464
.group = 1 },
1465
{ .name = "interface", .key = 'i',
1466
.arg = "NAME",
1467
.doc = "Network interface that will be used to search for"
1468
" Mandos servers",
1469
.group = 1 },
1470
{ .name = "seckey", .key = 's',
1471
.arg = "FILE",
1472
.doc = "OpenPGP secret key file base name",
1473
.group = 1 },
1474
{ .name = "pubkey", .key = 'p',
1475
.arg = "FILE",
1476
.doc = "OpenPGP public key file base name",
1477
.group = 2 },
1478
{ .name = "dh-bits", .key = 129,
1479
.arg = "BITS",
1480
.doc = "Bit length of the prime number used in the"
1481
" Diffie-Hellman key exchange",
1482
.group = 2 },
1483
{ .name = "priority", .key = 130,
1484
.arg = "STRING",
1485
.doc = "GnuTLS priority string for the TLS handshake",
1486
.group = 1 },
1487
{ .name = "delay", .key = 131,
1488
.arg = "SECONDS",
1489
.doc = "Maximum delay to wait for interface startup",
1490
.group = 2 },
1491
{ .name = "retry", .key = 132,
1492
.arg = "SECONDS",
1493
.doc = "Retry interval used when denied by the mandos server",
1494
.group = 2 },
1495
/*
1496
* These reproduce what we would get without ARGP_NO_HELP
1497
*/
1498
{ .name = "help", .key = '?',
1499
.doc = "Give this help list", .group = -1 },
1500
{ .name = "usage", .key = -3,
1501
.doc = "Give a short usage message", .group = -1 },
1502
{ .name = "version", .key = 'V',
1503
.doc = "Print program version", .group = -1 },
1504
{ .name = NULL }
1505
};
1506
1507
error_t parse_opt(int key, char *arg,
1508
struct argp_state *state){
1509
errno = 0;
1510
switch(key){
1511
case 128: /* --debug */
1512
debug = true;
1513
break;
1514
case 'c': /* --connect */
1515
connect_to = arg;
1516
break;
1517
case 'i': /* --interface */
1518
interface = arg;
1519
break;
1520
case 's': /* --seckey */
1521
seckey = arg;
1522
break;
1523
case 'p': /* --pubkey */
1524
pubkey = arg;
1525
break;
1526
case 129: /* --dh-bits */
1527
errno = 0;
1528
tmpmax = strtoimax(arg, &tmp, 10);
1529
if(errno != 0 or tmp == arg or *tmp != '\0'
1530
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1531
argp_error(state, "Bad number of DH bits");
1532
}
1533
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1534
break;
1535
case 130: /* --priority */
1536
mc.priority = arg;
1537
break;
1538
case 131: /* --delay */
1539
errno = 0;
1540
delay = strtof(arg, &tmp);
1541
if(errno != 0 or tmp == arg or *tmp != '\0'){
1542
argp_error(state, "Bad delay");
1543
}
1544
case 132: /* --retry */
1545
errno = 0;
1546
retry_interval = strtod(arg, &tmp);
1547
if(errno != 0 or tmp == arg or *tmp != '\0'
1548
or (retry_interval * 1000) > INT_MAX
1549
or retry_interval < 0){
1550
argp_error(state, "Bad retry interval");
1551
}
1552
break;
1553
/*
1554
* These reproduce what we would get without ARGP_NO_HELP
1555
*/
1556
case '?': /* --help */
1557
argp_state_help(state, state->out_stream,
1558
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1559
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1560
case -3: /* --usage */
1561
argp_state_help(state, state->out_stream,
1562
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1563
case 'V': /* --version */
1564
fprintf(state->out_stream, "%s\n", argp_program_version);
1565
exit(argp_err_exit_status);
1566
break;
1567
default:
1568
return ARGP_ERR_UNKNOWN;
1569
}
1570
return errno;
1571
}
1572
1573
struct argp argp = { .options = options, .parser = parse_opt,
1574
.args_doc = "",
1575
.doc = "Mandos client -- Get and decrypt"
1576
" passwords from a Mandos server" };
1577
ret = argp_parse(&argp, argc, argv,
1578
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1579
switch(ret){
1580
case 0:
1581
break;
1582
case ENOMEM:
1583
default:
1584
errno = ret;
1585
perror_plus("argp_parse");
1586
exitcode = EX_OSERR;
1587
goto end;
1588
case EINVAL:
1589
exitcode = EX_USAGE;
1590
goto end;
1591
}
1592
}
1593
1594
{
1595
/* Work around Debian bug #633582:
1596
<http://bugs.debian.org/633582> */
1597
struct stat st;
1598
1599
/* Re-raise priviliges */
1600
errno = 0;
1601
ret = seteuid(0);
1602
if(ret == -1){
1603
perror_plus("seteuid");
1604
}
1605
1606
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1607
int seckey_fd = open(seckey, O_RDONLY);
1608
if(seckey_fd == -1){
1609
perror_plus("open");
1610
} else {
1611
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1612
if(ret == -1){
1613
perror_plus("fstat");
1614
} else {
1615
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1616
ret = fchown(seckey_fd, uid, gid);
1617
if(ret == -1){
1618
perror_plus("fchown");
1619
}
1620
}
1621
}
1622
TEMP_FAILURE_RETRY(close(seckey_fd));
1623
}
1624
}
1625
1626
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1627
int pubkey_fd = open(pubkey, O_RDONLY);
1628
if(pubkey_fd == -1){
1629
perror_plus("open");
1630
} else {
1631
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1632
if(ret == -1){
1633
perror_plus("fstat");
1634
} else {
1635
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1636
ret = fchown(pubkey_fd, uid, gid);
1637
if(ret == -1){
1638
perror_plus("fchown");
1639
}
1640
}
1641
}
1642
TEMP_FAILURE_RETRY(close(pubkey_fd));
1643
}
1644
}
1645
1646
/* Lower privileges */
1647
errno = 0;
1648
ret = seteuid(uid);
1649
if(ret == -1){
1650
perror_plus("seteuid");
1651
}
1652
}
1653
1654
/* Find network hooks and run them */
1655
{
1656
struct dirent **direntries;
1657
struct dirent *direntry;
1658
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1659
alphasort);
1660
int devnull = open("/dev/null", O_RDONLY);
1661
for(int i = 0; i < numhooks; i++){
1662
direntry = direntries[0];
1663
char *fullname = NULL;
1664
ret = asprintf(&fullname, "%s/%s", tempdir,
1665
direntry->d_name);
1666
if(ret < 0){
1667
perror_plus("asprintf");
1668
continue;
1669
}
1670
pid_t hook_pid = fork();
1671
if(hook_pid == 0){
1672
/* Child */
1673
dup2(devnull, STDIN_FILENO);
1674
close(devnull);
1675
dup2(STDERR_FILENO, STDOUT_FILENO);
1676
setenv("DEVICE", interface, 1);
1677
setenv("VERBOSE", debug ? "1" : "0", 1);
1678
setenv("MODE", "start", 1);
1679
/* setenv( XXX more here */
1680
ret = execl(fullname, direntry->d_name, "start");
1681
perror_plus("execl");
1682
}
1683
free(fullname);
1684
if(quit_now){
1685
goto end;
1686
}
1687
}
1688
close(devnull);
1689
}
1690
1691
if(not debug){
1692
avahi_set_log_function(empty_log);
1693
}
1694
1695
if(interface[0] == '\0'){
1696
struct dirent **direntries;
1697
ret = scandir(sys_class_net, &direntries, good_interface,
1698
alphasort);
1699
if(ret >= 1){
1700
/* Pick the first good interface */
1701
interface = strdup(direntries[0]->d_name);
1702
if(debug){
1703
fprintf(stderr, "Using interface \"%s\"\n", interface);
1704
}
1705
if(interface == NULL){
1706
perror_plus("malloc");
1707
free(direntries);
1708
exitcode = EXIT_FAILURE;
1709
goto end;
1710
}
1711
free(direntries);
1712
} else {
1713
free(direntries);
1714
fprintf(stderr, "Could not find a network interface\n");
1715
exitcode = EXIT_FAILURE;
1716
goto end;
1717
}
1718
}
1719
1720
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1721
from the signal handler */
1722
/* Initialize the pseudo-RNG for Avahi */
1723
srand((unsigned int) time(NULL));
1724
mc.simple_poll = avahi_simple_poll_new();
1725
if(mc.simple_poll == NULL){
1726
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1727
exitcode = EX_UNAVAILABLE;
1728
goto end;
1729
}
1730
1731
sigemptyset(&sigterm_action.sa_mask);
1732
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1733
if(ret == -1){
1734
perror_plus("sigaddset");
1735
exitcode = EX_OSERR;
1736
goto end;
1737
}
1738
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1739
if(ret == -1){
1740
perror_plus("sigaddset");
1741
exitcode = EX_OSERR;
1742
goto end;
1743
}
1744
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1745
if(ret == -1){
1746
perror_plus("sigaddset");
1747
exitcode = EX_OSERR;
1748
goto end;
1749
}
1750
/* Need to check if the handler is SIG_IGN before handling:
1751
| [[info:libc:Initial Signal Actions]] |
1752
| [[info:libc:Basic Signal Handling]] |
1753
*/
1754
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1755
if(ret == -1){
1756
perror_plus("sigaction");
1757
return EX_OSERR;
1758
}
1759
if(old_sigterm_action.sa_handler != SIG_IGN){
1760
ret = sigaction(SIGINT, &sigterm_action, NULL);
1761
if(ret == -1){
1762
perror_plus("sigaction");
1763
exitcode = EX_OSERR;
1764
goto end;
1765
}
1766
}
1767
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1768
if(ret == -1){
1769
perror_plus("sigaction");
1770
return EX_OSERR;
1771
}
1772
if(old_sigterm_action.sa_handler != SIG_IGN){
1773
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1774
if(ret == -1){
1775
perror_plus("sigaction");
1776
exitcode = EX_OSERR;
1777
goto end;
1778
}
1779
}
1780
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1781
if(ret == -1){
1782
perror_plus("sigaction");
1783
return EX_OSERR;
1784
}
1785
if(old_sigterm_action.sa_handler != SIG_IGN){
1786
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1787
if(ret == -1){
1788
perror_plus("sigaction");
1789
exitcode = EX_OSERR;
1790
goto end;
1791
}
1792
}
1793
1794
/* If the interface is down, bring it up */
1795
if(strcmp(interface, "none") != 0){
987
1796
if_index = (AvahiIfIndex) if_nametoindex(interface);
988
1797
if(if_index == 0){
989
1798
fprintf(stderr, "No such interface: \"%s\"\n", interface);
990
exit(EXIT_FAILURE);
991
}
992
993
if(connect_to != NULL){
994
/* Connect directly, do not use Zeroconf */
995
/* (Mainly meant for debugging) */
996
char *address = strrchr(connect_to, ':');
997
if(address == NULL){
998
fprintf(stderr, "No colon in address\n");
999
exitcode = EXIT_FAILURE;
1000
goto end;
1001
}
1002
errno = 0;
1003
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1004
if(errno){
1005
perror("Bad port number");
1006
exitcode = EXIT_FAILURE;
1007
goto end;
1008
}
1009
*address = '\0';
1010
address = connect_to;
1011
ret = start_mandos_communication(address, port, if_index, &mc);
1012
if(ret < 0){
1013
exitcode = EXIT_FAILURE;
1014
} else {
1015
exitcode = EXIT_SUCCESS;
1016
}
1017
goto end;
1018
}
1019
1020
if (not debug){
1021
avahi_set_log_function(empty_log);
1022
}
1023
1024
/* Initialize the pseudo-RNG for Avahi */
1025
srand((unsigned int) time(NULL));
1026
1027
/* Allocate main Avahi loop object */
1028
mc.simple_poll = avahi_simple_poll_new();
1029
if (mc.simple_poll == NULL) {
1030
fprintf(stderr, "Avahi: Failed to create simple poll"
1031
" object.\n");
1032
exitcode = EXIT_FAILURE;
1033
goto end;
1034
}
1035
1036
{
1037
AvahiServerConfig config;
1038
/* Do not publish any local Zeroconf records */
1039
avahi_server_config_init(&config);
1040
config.publish_hinfo = 0;
1041
config.publish_addresses = 0;
1042
config.publish_workstation = 0;
1043
config.publish_domain = 0;
1044
1045
/* Allocate a new server */
1046
mc.server = avahi_server_new(avahi_simple_poll_get
1047
(mc.simple_poll), &config, NULL,
1048
NULL, &error);
1049
1050
/* Free the Avahi configuration data */
1051
avahi_server_config_free(&config);
1052
}
1053
1054
/* Check if creating the Avahi server object succeeded */
1055
if (mc.server == NULL) {
1056
fprintf(stderr, "Failed to create Avahi server: %s\n",
1057
avahi_strerror(error));
1058
exitcode = EXIT_FAILURE;
1059
goto end;
1060
}
1061
1062
/* Create the Avahi service browser */
1063
sb = avahi_s_service_browser_new(mc.server, if_index,
1064
AVAHI_PROTO_INET6,
1065
"_mandos._tcp", NULL, 0,
1066
browse_callback, &mc);
1067
if (sb == NULL) {
1068
fprintf(stderr, "Failed to create service browser: %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
exitcode = EXIT_FAILURE;
1071
goto end;
1072
}
1073
1074
/* Run the main loop */
1075
1076
if (debug){
1077
fprintf(stderr, "Starting Avahi loop search\n");
1078
}
1079
1080
avahi_simple_poll_loop(mc.simple_poll);
1081
1799
exitcode = EX_UNAVAILABLE;
1800
goto end;
1801
}
1802
1803
if(quit_now){
1804
goto end;
1805
}
1806
1807
/* Re-raise priviliges */
1808
errno = 0;
1809
ret = seteuid(0);
1810
if(ret == -1){
1811
perror_plus("seteuid");
1812
}
1813
1814
#ifdef __linux__
1815
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1816
messages about the network interface to mess up the prompt */
1817
ret = klogctl(8, NULL, 5);
1818
bool restore_loglevel = true;
1819
if(ret == -1){
1820
restore_loglevel = false;
1821
perror_plus("klogctl");
1822
}
1823
#endif /* __linux__ */
1824
1825
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1826
if(sd < 0){
1827
perror_plus("socket");
1828
exitcode = EX_OSERR;
1829
#ifdef __linux__
1830
if(restore_loglevel){
1831
ret = klogctl(7, NULL, 0);
1832
if(ret == -1){
1833
perror_plus("klogctl");
1834
}
1835
}
1836
#endif /* __linux__ */
1837
/* Lower privileges */
1838
errno = 0;
1839
ret = seteuid(uid);
1840
if(ret == -1){
1841
perror_plus("seteuid");
1842
}
1843
goto end;
1844
}
1845
strcpy(network.ifr_name, interface);
1846
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1847
if(ret == -1){
1848
perror_plus("ioctl SIOCGIFFLAGS");
1849
#ifdef __linux__
1850
if(restore_loglevel){
1851
ret = klogctl(7, NULL, 0);
1852
if(ret == -1){
1853
perror_plus("klogctl");
1854
}
1855
}
1856
#endif /* __linux__ */
1857
exitcode = EX_OSERR;
1858
/* Lower privileges */
1859
errno = 0;
1860
ret = seteuid(uid);
1861
if(ret == -1){
1862
perror_plus("seteuid");
1863
}
1864
goto end;
1865
}
1866
if((network.ifr_flags & IFF_UP) == 0){
1867
network.ifr_flags |= IFF_UP;
1868
take_down_interface = true;
1869
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1870
if(ret == -1){
1871
take_down_interface = false;
1872
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1873
exitcode = EX_OSERR;
1874
#ifdef __linux__
1875
if(restore_loglevel){
1876
ret = klogctl(7, NULL, 0);
1877
if(ret == -1){
1878
perror_plus("klogctl");
1879
}
1880
}
1881
#endif /* __linux__ */
1882
/* Lower privileges */
1883
errno = 0;
1884
ret = seteuid(uid);
1885
if(ret == -1){
1886
perror_plus("seteuid");
1887
}
1888
goto end;
1889
}
1890
}
1891
/* Sleep checking until interface is running.
1892
Check every 0.25s, up to total time of delay */
1893
for(int i=0; i < delay * 4; i++){
1894
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1895
if(ret == -1){
1896
perror_plus("ioctl SIOCGIFFLAGS");
1897
} else if(network.ifr_flags & IFF_RUNNING){
1898
break;
1899
}
1900
struct timespec sleeptime = { .tv_nsec = 250000000 };
1901
ret = nanosleep(&sleeptime, NULL);
1902
if(ret == -1 and errno != EINTR){
1903
perror_plus("nanosleep");
1904
}
1905
}
1906
if(not take_down_interface){
1907
/* We won't need the socket anymore */
1908
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1909
if(ret == -1){
1910
perror_plus("close");
1911
}
1912
}
1913
#ifdef __linux__
1914
if(restore_loglevel){
1915
/* Restores kernel loglevel to default */
1916
ret = klogctl(7, NULL, 0);
1917
if(ret == -1){
1918
perror_plus("klogctl");
1919
}
1920
}
1921
#endif /* __linux__ */
1922
/* Lower privileges */
1923
errno = 0;
1924
if(take_down_interface){
1925
/* Lower privileges */
1926
ret = seteuid(uid);
1927
if(ret == -1){
1928
perror_plus("seteuid");
1929
}
1930
} else {
1931
/* Lower privileges permanently */
1932
ret = setuid(uid);
1933
if(ret == -1){
1934
perror_plus("setuid");
1935
}
1936
}
1937
}
1938
1939
if(quit_now){
1940
goto end;
1941
}
1942
1943
ret = init_gnutls_global(pubkey, seckey);
1944
if(ret == -1){
1945
fprintf(stderr, "init_gnutls_global failed\n");
1946
exitcode = EX_UNAVAILABLE;
1947
goto end;
1948
} else {
1949
gnutls_initialized = true;
1950
}
1951
1952
if(quit_now){
1953
goto end;
1954
}
1955
1956
if(mkdtemp(tempdir) == NULL){
1957
perror_plus("mkdtemp");
1958
goto end;
1959
}
1960
tempdir_created = true;
1961
1962
if(quit_now){
1963
goto end;
1964
}
1965
1966
if(not init_gpgme(pubkey, seckey, tempdir)){
1967
fprintf(stderr, "init_gpgme failed\n");
1968
exitcode = EX_UNAVAILABLE;
1969
goto end;
1970
} else {
1971
gpgme_initialized = true;
1972
}
1973
1974
if(quit_now){
1975
goto end;
1976
}
1977
1978
if(connect_to != NULL){
1979
/* Connect directly, do not use Zeroconf */
1980
/* (Mainly meant for debugging) */
1981
char *address = strrchr(connect_to, ':');
1982
if(address == NULL){
1983
fprintf(stderr, "No colon in address\n");
1984
exitcode = EX_USAGE;
1985
goto end;
1986
}
1987
1988
if(quit_now){
1989
goto end;
1990
}
1991
1992
uint16_t port;
1993
errno = 0;
1994
tmpmax = strtoimax(address+1, &tmp, 10);
1995
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1996
or tmpmax != (uint16_t)tmpmax){
1997
fprintf(stderr, "Bad port number\n");
1998
exitcode = EX_USAGE;
1999
goto end;
2000
}
2001
2002
if(quit_now){
2003
goto end;
2004
}
2005
2006
port = (uint16_t)tmpmax;
2007
*address = '\0';
2008
/* Colon in address indicates IPv6 */
2009
int af;
2010
if(strchr(connect_to, ':') != NULL){
2011
af = AF_INET6;
2012
/* Accept [] around IPv6 address - see RFC 5952 */
2013
if(connect_to[0] == '[' and address[-1] == ']')
2014
{
2015
connect_to++;
2016
address[-1] = '\0';
2017
}
2018
} else {
2019
af = AF_INET;
2020
}
2021
address = connect_to;
2022
2023
if(quit_now){
2024
goto end;
2025
}
2026
2027
while(not quit_now){
2028
ret = start_mandos_communication(address, port, if_index, af);
2029
if(quit_now or ret == 0){
2030
break;
2031
}
2032
if(debug){
2033
fprintf(stderr, "Retrying in %d seconds\n",
2034
(int)retry_interval);
2035
}
2036
sleep((int)retry_interval);
2037
}
2038
2039
if (not quit_now){
2040
exitcode = EXIT_SUCCESS;
2041
}
2042
2043
goto end;
2044
}
2045
2046
if(quit_now){
2047
goto end;
2048
}
2049
2050
{
2051
AvahiServerConfig config;
2052
/* Do not publish any local Zeroconf records */
2053
avahi_server_config_init(&config);
2054
config.publish_hinfo = 0;
2055
config.publish_addresses = 0;
2056
config.publish_workstation = 0;
2057
config.publish_domain = 0;
2058
2059
/* Allocate a new server */
2060
mc.server = avahi_server_new(avahi_simple_poll_get
2061
(mc.simple_poll), &config, NULL,
2062
NULL, &error);
2063
2064
/* Free the Avahi configuration data */
2065
avahi_server_config_free(&config);
2066
}
2067
2068
/* Check if creating the Avahi server object succeeded */
2069
if(mc.server == NULL){
2070
fprintf(stderr, "Failed to create Avahi server: %s\n",
2071
avahi_strerror(error));
2072
exitcode = EX_UNAVAILABLE;
2073
goto end;
2074
}
2075
2076
if(quit_now){
2077
goto end;
2078
}
2079
2080
/* Create the Avahi service browser */
2081
sb = avahi_s_service_browser_new(mc.server, if_index,
2082
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2083
NULL, 0, browse_callback, NULL);
2084
if(sb == NULL){
2085
fprintf(stderr, "Failed to create service browser: %s\n",
2086
avahi_strerror(avahi_server_errno(mc.server)));
2087
exitcode = EX_UNAVAILABLE;
2088
goto end;
2089
}
2090
2091
if(quit_now){
2092
goto end;
2093
}
2094
2095
/* Run the main loop */
2096
2097
if(debug){
2098
fprintf(stderr, "Starting Avahi loop search\n");
2099
}
2100
2101
ret = avahi_loop_with_timeout(mc.simple_poll,
2102
(int)(retry_interval * 1000));
2103
if(debug){
2104
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2105
(ret == 0) ? "successfully" : "with error");
2106
}
2107
1082
2108
end:
1083
1084
if (debug){
1085
fprintf(stderr, "%s exiting\n", argv[0]);
1086
}
1087
1088
/* Cleanup things */
1089
if (sb != NULL)
1090
avahi_s_service_browser_free(sb);
1091
1092
if (mc.server != NULL)
1093
avahi_server_free(mc.server);
1094
1095
if (mc.simple_poll != NULL)
1096
avahi_simple_poll_free(mc.simple_poll);
1097
1098
if (gnutls_initalized){
1099
gnutls_certificate_free_credentials(mc.cred);
1100
gnutls_global_deinit ();
1101
}
1102
1103
if(pgpme_initalized){
1104
gpgme_release(mc.ctx);
1105
}
1106
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1109
DIR *d;
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1112
if(d == NULL){
1113
perror("opendir");
1114
} else {
1115
while(true){
1116
direntry = readdir(d);
1117
if(direntry == NULL){
1118
break;
1119
}
1120
if (direntry->d_type == DT_REG){
1121
char *fullname = NULL;
1122
ret = asprintf(&fullname, "%s/%s", tempdir,
1123
direntry->d_name);
1124
if(ret < 0){
1125
perror("asprintf");
1126
continue;
1127
}
1128
ret = unlink(fullname);
1129
if(ret == -1){
1130
fprintf(stderr, "unlink(\"%s\"): %s",
1131
fullname, strerror(errno));
1132
}
1133
free(fullname);
1134
}
1135
}
1136
}
1137
ret = rmdir(tempdir);
1138
if(ret == -1){
1139
perror("rmdir");
1140
}
1141
}
1142
1143
return exitcode;
2109
2110
if(debug){
2111
fprintf(stderr, "%s exiting\n", argv[0]);
2112
}
2113
2114
/* Cleanup things */
2115
if(sb != NULL)
2116
avahi_s_service_browser_free(sb);
2117
2118
if(mc.server != NULL)
2119
avahi_server_free(mc.server);
2120
2121
if(mc.simple_poll != NULL)
2122
avahi_simple_poll_free(mc.simple_poll);
2123
2124
if(gnutls_initialized){
2125
gnutls_certificate_free_credentials(mc.cred);
2126
gnutls_global_deinit();
2127
gnutls_dh_params_deinit(mc.dh_params);
2128
}
2129
2130
if(gpgme_initialized){
2131
gpgme_release(mc.ctx);
2132
}
2133
2134
/* Cleans up the circular linked list of Mandos servers the client
2135
has seen */
2136
if(mc.current_server != NULL){
2137
mc.current_server->prev->next = NULL;
2138
while(mc.current_server != NULL){
2139
server *next = mc.current_server->next;
2140
free(mc.current_server);
2141
mc.current_server = next;
2142
}
2143
}
2144
2145
/* XXX run network hooks "stop" here */
2146
2147
/* Take down the network interface */
2148
if(take_down_interface){
2149
/* Re-raise priviliges */
2150
errno = 0;
2151
ret = seteuid(0);
2152
if(ret == -1){
2153
perror_plus("seteuid");
2154
}
2155
if(geteuid() == 0){
2156
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2157
if(ret == -1){
2158
perror_plus("ioctl SIOCGIFFLAGS");
2159
} else if(network.ifr_flags & IFF_UP) {
2160
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2161
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2162
if(ret == -1){
2163
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2164
}
2165
}
2166
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2167
if(ret == -1){
2168
perror_plus("close");
2169
}
2170
/* Lower privileges permanently */
2171
errno = 0;
2172
ret = setuid(uid);
2173
if(ret == -1){
2174
perror_plus("setuid");
2175
}
2176
}
2177
}
2178
2179
/* Removes the GPGME temp directory and all files inside */
2180
if(tempdir_created){
2181
struct dirent **direntries = NULL;
2182
struct dirent *direntry = NULL;
2183
int numentries = scandir(tempdir, &direntries, notdotentries,
2184
alphasort);
2185
if (numentries > 0){
2186
for(int i = 0; i < numentries; i++){
2187
direntry = direntries[i];
2188
char *fullname = NULL;
2189
ret = asprintf(&fullname, "%s/%s", tempdir,
2190
direntry->d_name);
2191
if(ret < 0){
2192
perror_plus("asprintf");
2193
continue;
2194
}
2195
ret = remove(fullname);
2196
if(ret == -1){
2197
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2198
strerror(errno));
2199
}
2200
free(fullname);
2201
}
2202
}
2203
2204
/* need to clean even if 0 because man page doesn't specify */
2205
free(direntries);
2206
if (numentries == -1){
2207
perror_plus("scandir");
2208
}
2209
ret = rmdir(tempdir);
2210
if(ret == -1 and errno != ENOENT){
2211
perror_plus("rmdir");
2212
}
2213
}
2214
2215
if(quit_now){
2216
sigemptyset(&old_sigterm_action.sa_mask);
2217
old_sigterm_action.sa_handler = SIG_DFL;
2218
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2219
&old_sigterm_action,
2220
NULL));
2221
if(ret == -1){
2222
perror_plus("sigaction");
2223
}
2224
do {
2225
ret = raise(signal_received);
2226
} while(ret != 0 and errno == EINTR);
2227
if(ret != 0){
2228
perror_plus("raise");
2229
abort();
2230
}
2231
TEMP_FAILURE_RETRY(pause());
2232
}
2233
2234
return exitcode;
1144
2235
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0