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- Committer: Teddy Hogeborn
- Date: 2008-08-12 19:22:34 UTC
- Revision ID: teddy@fukt.bsnet.se-20080812192234-8bm17713ltih9ud1
* initramfs-tools-hook: New.
* initramfs-tools-hook-conf: New.
* initramfs-tools-hook-conf: New.
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugins.d/password-request.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
26
25
* along with this program. If not, see
27
26
* <http://www.gnu.org/licenses/>.
28
27
*
29
* Contact the authors at <mandos@recompile.se>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif
39
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
ferror() */
44
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
45
strerror(), memcpy(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
52
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
48
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
57
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
53
struct in6_addr, inet_pton(),
54
connect() */
64
55
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
56
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
68
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
59
SIOCSIFFLAGS, if_indextoname(),
70
60
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
74
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
62
getuid(), getgid(), setuid(),
63
setgid() */
64
#include <netinet/in.h>
65
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
79
67
#include <argp.h> /* struct argp_option, error_t, struct
80
68
argp_state, struct argp,
81
69
argp_parse(), ARGP_KEY_ARG,
82
70
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
89
#ifdef __linux__
90
#include <sys/klog.h> /* klogctl() */
91
#endif /* __linux__ */
92
71
93
72
/* Avahi */
94
73
/* All Avahi types, constants and functions
102
81
#include <avahi-common/error.h>
103
82
104
83
/* GnuTLS */
105
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
106
functions:
84
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
107
85
gnutls_*
108
86
init_gnutls_session(),
109
87
GNUTLS_* */
110
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
88
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
112
89
GNUTLS_OPENPGP_FMT_BASE64 */
113
90
114
91
/* GPGME */
115
#include <gpgme.h> /* All GPGME types, constants and
116
functions:
92
#include <gpgme.h> /* All GPGME types, constants and functions
117
93
gpgme_*
118
94
GPGME_PROTOCOL_OpenPGP,
119
95
GPG_ERR_NO_* */
120
96
121
97
#define BUFFER_SIZE 256
122
98
123
#define PATHDIR "/conf/conf.d/mandos"
124
#define SECKEY "seckey.txt"
125
#define PUBKEY "pubkey.txt"
126
#define HOOKDIR "/lib/mandos/network-hooks.d"
127
128
99
bool debug = false;
100
static const char *keydir = "/conf/conf.d/mandos";
129
101
static const char mandos_protocol_version[] = "1";
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;
102
const char *argp_program_version = "password-request 1.0";
103
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
145
104
146
105
/* Used for passing in values through the Avahi callback functions */
147
106
typedef struct {
151
110
unsigned int dh_bits;
152
111
gnutls_dh_params_t dh_params;
153
112
const char *priority;
154
gpgme_ctx_t ctx;
155
server *current_server;
156
113
} mandos_context;
157
114
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
115
/*
175
* Make additional room in "buffer" for at least BUFFER_SIZE more
176
* bytes. "buffer_capacity" is how much is currently allocated,
116
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
117
* "buffer_capacity" is how much is currently allocated,
177
118
* "buffer_length" is how much is already used.
178
119
*/
179
size_t incbuffer(char **buffer, size_t buffer_length,
120
size_t adjustbuffer(char **buffer, size_t buffer_length,
180
121
size_t buffer_capacity){
181
if(buffer_length + BUFFER_SIZE > buffer_capacity){
122
if (buffer_length + BUFFER_SIZE > buffer_capacity){
182
123
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
183
if(buffer == NULL){
124
if (buffer == NULL){
184
125
return 0;
185
126
}
186
127
buffer_capacity += BUFFER_SIZE;
188
129
return buffer_capacity;
189
130
}
190
131
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
229
132
/*
230
* Initialize GPGME.
133
* Decrypt OpenPGP data using keyrings in HOMEDIR.
134
* Returns -1 on error
231
135
*/
232
static bool init_gpgme(const char *seckey,
233
const char *pubkey, const char *tempdir){
136
static ssize_t pgp_packet_decrypt (const char *cryptotext,
137
size_t crypto_size,
138
char **plaintext,
139
const char *homedir){
140
gpgme_data_t dh_crypto, dh_plain;
141
gpgme_ctx_t ctx;
234
142
gpgme_error_t rc;
143
ssize_t ret;
144
size_t plaintext_capacity = 0;
145
ssize_t plaintext_length = 0;
235
146
gpgme_engine_info_t engine_info;
236
147
237
238
/*
239
* Helper function to insert pub and seckey to the engine keyring.
240
*/
241
bool import_key(const char *filename){
242
int ret;
243
int fd;
244
gpgme_data_t pgp_data;
245
246
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
247
if(fd == -1){
248
perror_plus("open");
249
return false;
250
}
251
252
rc = gpgme_data_new_from_fd(&pgp_data, fd);
253
if(rc != GPG_ERR_NO_ERROR){
254
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
255
gpgme_strsource(rc), gpgme_strerror(rc));
256
return false;
257
}
258
259
rc = gpgme_op_import(mc.ctx, pgp_data);
260
if(rc != GPG_ERR_NO_ERROR){
261
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
262
gpgme_strsource(rc), gpgme_strerror(rc));
263
return false;
264
}
265
266
ret = (int)TEMP_FAILURE_RETRY(close(fd));
267
if(ret == -1){
268
perror_plus("close");
269
}
270
gpgme_data_release(pgp_data);
271
return true;
272
}
273
274
if(debug){
275
fprintf(stderr, "Initializing GPGME\n");
148
if (debug){
149
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
276
150
}
277
151
278
152
/* Init GPGME */
279
153
gpgme_check_version(NULL);
280
154
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
281
if(rc != GPG_ERR_NO_ERROR){
155
if (rc != GPG_ERR_NO_ERROR){
282
156
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
283
157
gpgme_strsource(rc), gpgme_strerror(rc));
284
return false;
158
return -1;
285
159
}
286
160
287
161
/* Set GPGME home directory for the OpenPGP engine only */
288
rc = gpgme_get_engine_info(&engine_info);
289
if(rc != GPG_ERR_NO_ERROR){
162
rc = gpgme_get_engine_info (&engine_info);
163
if (rc != GPG_ERR_NO_ERROR){
290
164
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
291
165
gpgme_strsource(rc), gpgme_strerror(rc));
292
return false;
166
return -1;
293
167
}
294
168
while(engine_info != NULL){
295
169
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
296
170
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
297
engine_info->file_name, tempdir);
171
engine_info->file_name, homedir);
298
172
break;
299
173
}
300
174
engine_info = engine_info->next;
301
175
}
302
176
if(engine_info == NULL){
303
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
304
return false;
305
}
306
307
/* Create new GPGME "context" */
308
rc = gpgme_new(&(mc.ctx));
309
if(rc != GPG_ERR_NO_ERROR){
310
fprintf(stderr, "bad gpgme_new: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
312
return false;
313
}
314
315
if(not import_key(pubkey) or not import_key(seckey)){
316
return false;
317
}
318
319
return true;
320
}
321
322
/*
323
* Decrypt OpenPGP data.
324
* Returns -1 on error
325
*/
326
static ssize_t pgp_packet_decrypt(const char *cryptotext,
327
size_t crypto_size,
328
char **plaintext){
329
gpgme_data_t dh_crypto, dh_plain;
330
gpgme_error_t rc;
331
ssize_t ret;
332
size_t plaintext_capacity = 0;
333
ssize_t plaintext_length = 0;
334
335
if(debug){
336
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
177
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
178
return -1;
337
179
}
338
180
339
181
/* Create new GPGME data buffer from memory cryptotext */
340
182
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
341
183
0);
342
if(rc != GPG_ERR_NO_ERROR){
184
if (rc != GPG_ERR_NO_ERROR){
343
185
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
344
186
gpgme_strsource(rc), gpgme_strerror(rc));
345
187
return -1;
347
189
348
190
/* Create new empty GPGME data buffer for the plaintext */
349
191
rc = gpgme_data_new(&dh_plain);
350
if(rc != GPG_ERR_NO_ERROR){
192
if (rc != GPG_ERR_NO_ERROR){
351
193
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
352
194
gpgme_strsource(rc), gpgme_strerror(rc));
353
195
gpgme_data_release(dh_crypto);
354
196
return -1;
355
197
}
356
198
199
/* Create new GPGME "context" */
200
rc = gpgme_new(&ctx);
201
if (rc != GPG_ERR_NO_ERROR){
202
fprintf(stderr, "bad gpgme_new: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
204
plaintext_length = -1;
205
goto decrypt_end;
206
}
207
357
208
/* Decrypt data from the cryptotext data buffer to the plaintext
358
209
data buffer */
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
360
if(rc != GPG_ERR_NO_ERROR){
210
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
211
if (rc != GPG_ERR_NO_ERROR){
361
212
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
362
213
gpgme_strsource(rc), gpgme_strerror(rc));
363
214
plaintext_length = -1;
364
if(debug){
365
gpgme_decrypt_result_t result;
366
result = gpgme_op_decrypt_result(mc.ctx);
367
if(result == NULL){
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
369
} else {
370
fprintf(stderr, "Unsupported algorithm: %s\n",
371
result->unsupported_algorithm);
372
fprintf(stderr, "Wrong key usage: %u\n",
373
result->wrong_key_usage);
374
if(result->file_name != NULL){
375
fprintf(stderr, "File name: %s\n", result->file_name);
376
}
377
gpgme_recipient_t recipient;
378
recipient = result->recipients;
215
goto decrypt_end;
216
}
217
218
if(debug){
219
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
220
}
221
222
if (debug){
223
gpgme_decrypt_result_t result;
224
result = gpgme_op_decrypt_result(ctx);
225
if (result == NULL){
226
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
227
} else {
228
fprintf(stderr, "Unsupported algorithm: %s\n",
229
result->unsupported_algorithm);
230
fprintf(stderr, "Wrong key usage: %u\n",
231
result->wrong_key_usage);
232
if(result->file_name != NULL){
233
fprintf(stderr, "File name: %s\n", result->file_name);
234
}
235
gpgme_recipient_t recipient;
236
recipient = result->recipients;
237
if(recipient){
379
238
while(recipient != NULL){
380
239
fprintf(stderr, "Public key algorithm: %s\n",
381
240
gpgme_pubkey_algo_name(recipient->pubkey_algo));
387
246
}
388
247
}
389
248
}
390
goto decrypt_end;
391
}
392
393
if(debug){
394
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
395
249
}
396
250
397
251
/* Seek back to the beginning of the GPGME plaintext data buffer */
398
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
399
perror_plus("gpgme_data_seek");
252
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
253
perror("pgpme_data_seek");
400
254
plaintext_length = -1;
401
255
goto decrypt_end;
402
256
}
403
257
404
258
*plaintext = NULL;
405
259
while(true){
406
plaintext_capacity = incbuffer(plaintext,
260
plaintext_capacity = adjustbuffer(plaintext,
407
261
(size_t)plaintext_length,
408
262
plaintext_capacity);
409
if(plaintext_capacity == 0){
410
perror_plus("incbuffer");
263
if (plaintext_capacity == 0){
264
perror("adjustbuffer");
411
265
plaintext_length = -1;
412
266
goto decrypt_end;
413
267
}
415
269
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
416
270
BUFFER_SIZE);
417
271
/* Print the data, if any */
418
if(ret == 0){
272
if (ret == 0){
419
273
/* EOF */
420
274
break;
421
275
}
422
276
if(ret < 0){
423
perror_plus("gpgme_data_read");
277
perror("gpgme_data_read");
424
278
plaintext_length = -1;
425
279
goto decrypt_end;
426
280
}
427
281
plaintext_length += ret;
428
282
}
429
283
430
284
if(debug){
431
285
fprintf(stderr, "Decrypted password is: ");
432
286
for(ssize_t i = 0; i < plaintext_length; i++){
445
299
return plaintext_length;
446
300
}
447
301
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)
302
static const char * safer_gnutls_strerror (int value) {
303
const char *ret = gnutls_strerror (value);
304
if (ret == NULL)
452
305
ret = "(unknown)";
453
306
return ret;
454
307
}
459
312
fprintf(stderr, "GnuTLS: %s", string);
460
313
}
461
314
462
static int init_gnutls_global(const char *pubkeyfilename,
463
const char *seckeyfilename){
315
static int init_gnutls_global(mandos_context *mc,
316
const char *pubkeyfile,
317
const char *seckeyfile){
464
318
int ret;
465
319
466
320
if(debug){
468
322
}
469
323
470
324
ret = gnutls_global_init();
471
if(ret != GNUTLS_E_SUCCESS){
472
fprintf(stderr, "GnuTLS global_init: %s\n",
473
safer_gnutls_strerror(ret));
325
if (ret != GNUTLS_E_SUCCESS) {
326
fprintf (stderr, "GnuTLS global_init: %s\n",
327
safer_gnutls_strerror(ret));
474
328
return -1;
475
329
}
476
330
477
if(debug){
331
if (debug){
478
332
/* "Use a log level over 10 to enable all debugging options."
479
333
* - GnuTLS manual
480
334
*/
483
337
}
484
338
485
339
/* OpenPGP credentials */
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();
340
gnutls_certificate_allocate_credentials(&mc->cred);
341
if (ret != GNUTLS_E_SUCCESS){
342
fprintf (stderr, "GnuTLS memory error: %s\n",
343
safer_gnutls_strerror(ret));
344
gnutls_global_deinit ();
491
345
return -1;
492
346
}
493
347
494
348
if(debug){
495
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
496
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
497
seckeyfilename);
349
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
350
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
351
seckeyfile);
498
352
}
499
353
500
354
ret = gnutls_certificate_set_openpgp_key_file
501
(mc.cred, pubkeyfilename, seckeyfilename,
502
GNUTLS_OPENPGP_FMT_BASE64);
503
if(ret != GNUTLS_E_SUCCESS){
355
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
356
if (ret != GNUTLS_E_SUCCESS) {
504
357
fprintf(stderr,
505
358
"Error[%d] while reading the OpenPGP key pair ('%s',"
506
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
507
fprintf(stderr, "The GnuTLS error is: %s\n",
359
" '%s')\n", ret, pubkeyfile, seckeyfile);
360
fprintf(stdout, "The GnuTLS error is: %s\n",
508
361
safer_gnutls_strerror(ret));
509
362
goto globalfail;
510
363
}
511
364
512
365
/* GnuTLS server initialization */
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));
517
goto globalfail;
518
}
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));
523
goto globalfail;
524
}
525
526
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
527
366
ret = gnutls_dh_params_init(&mc->dh_params);
367
if (ret != GNUTLS_E_SUCCESS) {
368
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
369
" %s\n", safer_gnutls_strerror(ret));
370
goto globalfail;
371
}
372
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
373
if (ret != GNUTLS_E_SUCCESS) {
374
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
375
safer_gnutls_strerror(ret));
376
goto globalfail;
377
}
378
379
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
380
528
381
return 0;
529
382
530
383
globalfail:
531
532
gnutls_certificate_free_credentials(mc.cred);
384
385
gnutls_certificate_free_credentials(mc->cred);
533
386
gnutls_global_deinit();
534
gnutls_dh_params_deinit(mc.dh_params);
535
387
return -1;
388
536
389
}
537
390
538
static int init_gnutls_session(gnutls_session_t *session){
391
static int init_gnutls_session(mandos_context *mc,
392
gnutls_session_t *session){
539
393
int ret;
540
394
/* GnuTLS session creation */
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){
395
ret = gnutls_init(session, GNUTLS_SERVER);
396
if (ret != GNUTLS_E_SUCCESS){
548
397
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
549
398
safer_gnutls_strerror(ret));
550
399
}
551
400
552
401
{
553
402
const char *err;
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){
403
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
404
if (ret != GNUTLS_E_SUCCESS) {
562
405
fprintf(stderr, "Syntax error at: %s\n", err);
563
406
fprintf(stderr, "GnuTLS error: %s\n",
564
407
safer_gnutls_strerror(ret));
565
gnutls_deinit(*session);
408
gnutls_deinit (*session);
566
409
return -1;
567
410
}
568
411
}
569
412
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){
413
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
414
mc->cred);
415
if (ret != GNUTLS_E_SUCCESS) {
579
416
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
580
417
safer_gnutls_strerror(ret));
581
gnutls_deinit(*session);
418
gnutls_deinit (*session);
582
419
return -1;
583
420
}
584
421
585
422
/* ignore client certificate if any. */
586
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
423
gnutls_certificate_server_set_request (*session,
424
GNUTLS_CERT_IGNORE);
587
425
588
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
426
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
589
427
590
428
return 0;
591
429
}
597
435
/* Called when a Mandos server is found */
598
436
static int start_mandos_communication(const char *ip, uint16_t port,
599
437
AvahiIfIndex if_index,
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;
438
mandos_context *mc){
439
int ret, tcp_sd;
440
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
607
441
char *buffer = NULL;
608
char *decrypted_buffer = NULL;
442
char *decrypted_buffer;
609
443
size_t buffer_length = 0;
610
444
size_t buffer_capacity = 0;
445
ssize_t decrypted_buffer_size;
611
446
size_t written;
612
int retval = -1;
447
int retval = 0;
448
char interface[IF_NAMESIZE];
613
449
gnutls_session_t session;
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){
450
451
ret = init_gnutls_session (mc, &session);
452
if (ret != 0){
638
453
return -1;
639
454
}
640
455
641
456
if(debug){
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
457
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
643
458
"\n", ip, port);
644
459
}
645
460
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;
652
}
653
654
if(quit_now){
655
errno = EINTR;
656
goto mandos_end;
657
}
658
659
memset(&to, 0, sizeof(to));
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;
461
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
462
if(tcp_sd < 0) {
463
perror("socket");
464
return -1;
465
}
466
467
if(debug){
468
if(if_indextoname((unsigned int)if_index, interface) == NULL){
469
perror("if_indextoname");
470
return -1;
471
}
472
fprintf(stderr, "Binding to interface %s\n", interface);
473
}
474
475
memset(&to,0,sizeof(to)); /* Spurious warning */
476
to.in6.sin6_family = AF_INET6;
477
/* It would be nice to have a way to detect if we were passed an
478
IPv4 address here. Now we assume an IPv6 address. */
479
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
480
if (ret < 0 ){
481
perror("inet_pton");
482
return -1;
672
483
}
673
484
if(ret == 0){
674
int e = errno;
675
485
fprintf(stderr, "Bad address: %s\n", ip);
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
}
486
return -1;
487
}
488
to.in6.sin6_port = htons(port); /* Spurious warning */
701
489
702
if(quit_now){
703
errno = EINTR;
704
goto mandos_end;
705
}
490
to.in6.sin6_scope_id = (uint32_t)if_index;
706
491
707
492
if(debug){
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");
493
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
494
port);
495
char addrstr[INET6_ADDRSTRLEN] = "";
496
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
497
sizeof(addrstr)) == NULL){
498
perror("inet_ntop");
732
499
} else {
733
500
if(strcmp(addrstr, ip) != 0){
734
501
fprintf(stderr, "Canonical address form: %s\n", addrstr);
736
503
}
737
504
}
738
505
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;
761
}
762
506
ret = connect(tcp_sd, &to.in, sizeof(to));
507
if (ret < 0){
508
perror("connect");
509
return -1;
510
}
511
763
512
const char *out = mandos_protocol_version;
764
513
written = 0;
765
while(true){
514
while (true){
766
515
size_t out_size = strlen(out);
767
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
768
517
out_size - written));
769
if(ret == -1){
770
int e = errno;
771
perror_plus("write");
772
errno = e;
518
if (ret == -1){
519
perror("write");
520
retval = -1;
773
521
goto mandos_end;
774
522
}
775
523
written += (size_t)ret;
776
524
if(written < out_size){
777
525
continue;
778
526
} else {
779
if(out == mandos_protocol_version){
527
if (out == mandos_protocol_version){
780
528
written = 0;
781
529
out = "\r\n";
782
530
} else {
783
531
break;
784
532
}
785
533
}
786
787
if(quit_now){
788
errno = EINTR;
789
goto mandos_end;
790
}
791
534
}
792
535
793
536
if(debug){
794
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
795
538
}
796
539
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
}
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
542
do{
543
ret = gnutls_handshake (session);
816
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
817
545
818
if(ret != GNUTLS_E_SUCCESS){
546
if (ret != GNUTLS_E_SUCCESS){
819
547
if(debug){
820
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
821
gnutls_perror(ret);
549
gnutls_perror (ret);
822
550
}
823
errno = EPROTO;
551
retval = -1;
824
552
goto mandos_end;
825
553
}
826
554
827
555
/* Read OpenPGP packet that contains the wanted password */
828
556
829
557
if(debug){
830
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
831
559
ip);
832
560
}
833
561
834
562
while(true){
835
836
if(quit_now){
837
errno = EINTR;
838
goto mandos_end;
839
}
840
841
buffer_capacity = incbuffer(&buffer, buffer_length,
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
842
564
buffer_capacity);
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){
565
if (buffer_capacity == 0){
566
perror("adjustbuffer");
567
retval = -1;
568
goto mandos_end;
569
}
570
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
573
if (ret == 0){
858
574
break;
859
575
}
860
if(sret < 0){
861
switch(sret){
576
if (ret < 0){
577
switch(ret){
862
578
case GNUTLS_E_INTERRUPTED:
863
579
case GNUTLS_E_AGAIN:
864
580
break;
865
581
case GNUTLS_E_REHANDSHAKE:
866
do {
867
ret = gnutls_handshake(session);
868
869
if(quit_now){
870
errno = EINTR;
871
goto mandos_end;
872
}
582
do{
583
ret = gnutls_handshake (session);
873
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
874
if(ret < 0){
585
if (ret < 0){
875
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
876
gnutls_perror(ret);
877
errno = EPROTO;
587
gnutls_perror (ret);
588
retval = -1;
878
589
goto mandos_end;
879
590
}
880
591
break;
881
592
default:
882
593
fprintf(stderr, "Unknown error while reading data from"
883
594
" encrypted session with Mandos server\n");
884
gnutls_bye(session, GNUTLS_SHUT_RDWR);
885
errno = EIO;
595
retval = -1;
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
886
597
goto mandos_end;
887
598
}
888
599
} else {
889
buffer_length += (size_t) sret;
600
buffer_length += (size_t) ret;
890
601
}
891
602
}
892
603
894
605
fprintf(stderr, "Closing TLS session\n");
895
606
}
896
607
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;
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
609
610
if (buffer_length > 0){
912
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
913
612
buffer_length,
914
&decrypted_buffer);
915
if(decrypted_buffer_size >= 0){
916
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
917
616
written = 0;
918
617
while(written < (size_t) decrypted_buffer_size){
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);
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
stdout);
927
621
if(ret == 0 and ferror(stdout)){
928
int e = errno;
929
622
if(debug){
930
623
fprintf(stderr, "Error writing encrypted data: %s\n",
931
624
strerror(errno));
932
625
}
933
errno = e;
934
goto mandos_end;
626
retval = -1;
627
break;
935
628
}
936
629
written += (size_t)ret;
937
630
}
938
retval = 0;
631
free(decrypted_buffer);
632
} else {
633
retval = -1;
939
634
}
940
635
}
941
636
942
637
/* Shutdown procedure */
943
638
944
639
mandos_end:
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
}
964
}
640
free(buffer);
641
close(tcp_sd);
642
gnutls_deinit (session);
965
643
return retval;
966
644
}
967
645
968
646
static void resolve_callback(AvahiSServiceResolver *r,
969
647
AvahiIfIndex interface,
970
AvahiProtocol proto,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
971
649
AvahiResolverEvent event,
972
650
const char *name,
973
651
const char *type,
978
656
AVAHI_GCC_UNUSED AvahiStringList *txt,
979
657
AVAHI_GCC_UNUSED AvahiLookupResultFlags
980
658
flags,
981
AVAHI_GCC_UNUSED void* userdata){
982
assert(r);
659
void* userdata) {
660
mandos_context *mc = userdata;
661
assert(r); /* Spurious warning */
983
662
984
663
/* Called whenever a service has been resolved successfully or
985
664
timed out */
986
665
987
if(quit_now){
988
return;
989
}
990
991
switch(event){
666
switch (event) {
992
667
default:
993
668
case AVAHI_RESOLVER_FAILURE:
994
669
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
995
670
" of type '%s' in domain '%s': %s\n", name, type, domain,
996
avahi_strerror(avahi_server_errno(mc.server)));
671
avahi_strerror(avahi_server_errno(mc->server)));
997
672
break;
998
673
999
674
case AVAHI_RESOLVER_FOUND:
1002
677
avahi_address_snprint(ip, sizeof(ip), address);
1003
678
if(debug){
1004
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1005
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1006
ip, (intmax_t)interface, port);
680
PRIu16 ") on port %d\n", name, host_name, ip,
681
interface, port);
1007
682
}
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));
683
int ret = start_mandos_communication(ip, port, interface, mc);
684
if (ret == 0){
685
exit(EXIT_SUCCESS);
1015
686
}
1016
687
}
1017
688
}
1018
689
avahi_s_service_resolver_free(r);
1019
690
}
1020
691
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){
1031
assert(b);
692
static void browse_callback( AvahiSServiceBrowser *b,
693
AvahiIfIndex interface,
694
AvahiProtocol protocol,
695
AvahiBrowserEvent event,
696
const char *name,
697
const char *type,
698
const char *domain,
699
AVAHI_GCC_UNUSED AvahiLookupResultFlags
700
flags,
701
void* userdata) {
702
mandos_context *mc = userdata;
703
assert(b); /* Spurious warning */
1032
704
1033
705
/* Called whenever a new services becomes available on the LAN or
1034
706
is removed from the LAN */
1035
707
1036
if(quit_now){
1037
return;
1038
}
1039
1040
switch(event){
708
switch (event) {
1041
709
default:
1042
710
case AVAHI_BROWSER_FAILURE:
1043
711
1044
712
fprintf(stderr, "(Avahi browser) %s\n",
1045
avahi_strerror(avahi_server_errno(mc.server)));
1046
avahi_simple_poll_quit(mc.simple_poll);
713
avahi_strerror(avahi_server_errno(mc->server)));
714
avahi_simple_poll_quit(mc->simple_poll);
1047
715
return;
1048
716
1049
717
case AVAHI_BROWSER_NEW:
1052
720
the callback function is called the Avahi server will free the
1053
721
resolver for us. */
1054
722
1055
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1056
name, type, domain, protocol, 0,
1057
resolve_callback, NULL) == NULL)
723
if (!(avahi_s_service_resolver_new(mc->server, interface,
724
protocol, name, type, domain,
725
AVAHI_PROTO_INET6, 0,
726
resolve_callback, mc)))
1058
727
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1059
name, avahi_strerror(avahi_server_errno(mc.server)));
728
name, avahi_strerror(avahi_server_errno(mc->server)));
1060
729
break;
1061
730
1062
731
case AVAHI_BROWSER_REMOVE:
1071
740
}
1072
741
}
1073
742
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
if(if_entry->d_name[0] == '.'){
1156
return 0;
1157
}
1158
1159
struct ifreq ifr;
1160
if(not get_flags(if_entry->d_name, &ifr)){
1161
if(debug){
1162
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1163
if_entry->d_name);
1164
}
1165
return 0;
1166
}
1167
1168
if(not good_flags(if_entry->d_name, &ifr)){
1169
return 0;
1170
}
1171
return 1;
1172
}
1173
1174
/*
1175
* This function determines if a directory entry in /sys/class/net
1176
* corresponds to an acceptable network device which is up.
1177
* (This function is passed to scandir(3) as a filter function.)
1178
*/
1179
int up_interface(const struct dirent *if_entry){
1180
if(if_entry->d_name[0] == '.'){
1181
return 0;
1182
}
1183
1184
struct ifreq ifr;
1185
if(not get_flags(if_entry->d_name, &ifr)){
1186
if(debug){
1187
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1188
if_entry->d_name);
1189
}
1190
return 0;
1191
}
1192
1193
/* Reject down interfaces */
1194
if(not (ifr.ifr_flags & IFF_UP)){
1195
if(debug){
1196
fprintf(stderr, "Rejecting down interface \"%s\"\n",
1197
if_entry->d_name);
1198
}
1199
return 0;
1200
}
1201
1202
/* Reject non-running interfaces */
1203
if(not (ifr.ifr_flags & IFF_RUNNING)){
1204
if(debug){
1205
fprintf(stderr, "Rejecting non-running interface \"%s\"\n",
1206
if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1215
}
1216
1217
int notdotentries(const struct dirent *direntry){
1218
/* Skip "." and ".." */
1219
if(direntry->d_name[0] == '.'
1220
and (direntry->d_name[1] == '\0'
1221
or (direntry->d_name[1] == '.'
1222
and direntry->d_name[2] == '\0'))){
1223
return 0;
1224
}
1225
return 1;
1226
}
1227
1228
/* Is this directory entry a runnable program? */
1229
int runnable_hook(const struct dirent *direntry){
1230
int ret;
1231
struct stat st;
1232
1233
if((direntry->d_name)[0] == '\0'){
1234
/* Empty name? */
1235
return 0;
1236
}
1237
1238
/* Save pointer to last character */
1239
char *end = strchr(direntry->d_name, '\0')-1;
1240
1241
if(*end == '~'){
1242
/* Backup name~ */
1243
return 0;
1244
}
1245
1246
if(((direntry->d_name)[0] == '#')
1247
and (*end == '#')){
1248
/* Temporary #name# */
1249
return 0;
1250
}
1251
1252
/* XXX more rules here */
1253
1254
ret = stat(direntry->d_name, &st);
1255
if(ret == -1){
1256
if(debug){
1257
perror_plus("Could not stat plugin");
1258
}
1259
return 0;
1260
}
1261
if(not (S_ISREG(st.st_mode))){
1262
/* Not a regular file */
1263
return 0;
1264
}
1265
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1266
/* Not executable */
1267
return 0;
1268
}
1269
return 1;
1270
}
1271
1272
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1273
int ret;
1274
struct timespec now;
1275
struct timespec waited_time;
1276
intmax_t block_time;
1277
1278
while(true){
1279
if(mc.current_server == NULL){
1280
if (debug){
1281
fprintf(stderr,
1282
"Wait until first server is found. No timeout!\n");
1283
}
1284
ret = avahi_simple_poll_iterate(s, -1);
1285
} else {
1286
if (debug){
1287
fprintf(stderr, "Check current_server if we should run it,"
1288
" or wait\n");
1289
}
1290
/* the current time */
1291
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1292
if(ret == -1){
1293
perror_plus("clock_gettime");
1294
return -1;
1295
}
1296
/* Calculating in ms how long time between now and server
1297
who we visted longest time ago. Now - last seen. */
1298
waited_time.tv_sec = (now.tv_sec
1299
- mc.current_server->last_seen.tv_sec);
1300
waited_time.tv_nsec = (now.tv_nsec
1301
- mc.current_server->last_seen.tv_nsec);
1302
/* total time is 10s/10,000ms.
1303
Converting to s from ms by dividing by 1,000,
1304
and ns to ms by dividing by 1,000,000. */
1305
block_time = ((retry_interval
1306
- ((intmax_t)waited_time.tv_sec * 1000))
1307
- ((intmax_t)waited_time.tv_nsec / 1000000));
1308
1309
if (debug){
1310
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1311
}
1312
1313
if(block_time <= 0){
1314
ret = start_mandos_communication(mc.current_server->ip,
1315
mc.current_server->port,
1316
mc.current_server->if_index,
1317
mc.current_server->af);
1318
if(ret == 0){
1319
avahi_simple_poll_quit(mc.simple_poll);
1320
return 0;
1321
}
1322
ret = clock_gettime(CLOCK_MONOTONIC,
1323
&mc.current_server->last_seen);
1324
if(ret == -1){
1325
perror_plus("clock_gettime");
1326
return -1;
1327
}
1328
mc.current_server = mc.current_server->next;
1329
block_time = 0; /* Call avahi to find new Mandos
1330
servers, but don't block */
1331
}
1332
1333
ret = avahi_simple_poll_iterate(s, (int)block_time);
1334
}
1335
if(ret != 0){
1336
if (ret > 0 or errno != EINTR) {
1337
return (ret != 1) ? ret : 0;
1338
}
1339
}
1340
}
1341
}
743
/* Combines file name and path and returns the malloced new
744
string. some sane checks could/should be added */
745
static const char *combinepath(const char *first, const char *second){
746
size_t f_len = strlen(first);
747
size_t s_len = strlen(second);
748
char *tmp = malloc(f_len + s_len + 2);
749
if (tmp == NULL){
750
return NULL;
751
}
752
if(f_len > 0){
753
memcpy(tmp, first, f_len); /* Spurious warning */
754
}
755
tmp[f_len] = '/';
756
if(s_len > 0){
757
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
758
}
759
tmp[f_len + 1 + s_len] = '\0';
760
return tmp;
761
}
762
1342
763
1343
764
int main(int argc, char *argv[]){
1344
AvahiSServiceBrowser *sb = NULL;
1345
int error;
1346
int ret;
1347
intmax_t tmpmax;
1348
char *tmp;
1349
int exitcode = EXIT_SUCCESS;
1350
const char *interface = "";
1351
struct ifreq network;
1352
int sd = -1;
1353
bool take_down_interface = false;
1354
uid_t uid;
1355
gid_t gid;
1356
char tempdir[] = "/tmp/mandosXXXXXX";
1357
bool tempdir_created = false;
1358
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1359
const char *seckey = PATHDIR "/" SECKEY;
1360
const char *pubkey = PATHDIR "/" PUBKEY;
1361
1362
bool gnutls_initialized = false;
1363
bool gpgme_initialized = false;
1364
float delay = 2.5f;
1365
double retry_interval = 10; /* 10s between trying a server and
1366
retrying the same server again */
1367
1368
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1369
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1370
1371
uid = getuid();
1372
gid = getgid();
1373
1374
/* Lower any group privileges we might have, just to be safe */
1375
errno = 0;
1376
ret = setgid(gid);
1377
if(ret == -1){
1378
perror_plus("setgid");
1379
}
1380
1381
/* Lower user privileges (temporarily) */
1382
errno = 0;
1383
ret = seteuid(uid);
1384
if(ret == -1){
1385
perror_plus("seteuid");
1386
}
1387
1388
if(quit_now){
1389
goto end;
1390
}
1391
1392
{
1393
struct argp_option options[] = {
1394
{ .name = "debug", .key = 128,
1395
.doc = "Debug mode", .group = 3 },
1396
{ .name = "connect", .key = 'c',
1397
.arg = "ADDRESS:PORT",
1398
.doc = "Connect directly to a specific Mandos server",
1399
.group = 1 },
1400
{ .name = "interface", .key = 'i',
1401
.arg = "NAME",
1402
.doc = "Network interface that will be used to search for"
1403
" Mandos servers",
1404
.group = 1 },
1405
{ .name = "seckey", .key = 's',
1406
.arg = "FILE",
1407
.doc = "OpenPGP secret key file base name",
1408
.group = 1 },
1409
{ .name = "pubkey", .key = 'p',
1410
.arg = "FILE",
1411
.doc = "OpenPGP public key file base name",
1412
.group = 2 },
1413
{ .name = "dh-bits", .key = 129,
1414
.arg = "BITS",
1415
.doc = "Bit length of the prime number used in the"
1416
" Diffie-Hellman key exchange",
1417
.group = 2 },
1418
{ .name = "priority", .key = 130,
1419
.arg = "STRING",
1420
.doc = "GnuTLS priority string for the TLS handshake",
1421
.group = 1 },
1422
{ .name = "delay", .key = 131,
1423
.arg = "SECONDS",
1424
.doc = "Maximum delay to wait for interface startup",
1425
.group = 2 },
1426
{ .name = "retry", .key = 132,
1427
.arg = "SECONDS",
1428
.doc = "Retry interval used when denied by the mandos server",
1429
.group = 2 },
1430
/*
1431
* These reproduce what we would get without ARGP_NO_HELP
1432
*/
1433
{ .name = "help", .key = '?',
1434
.doc = "Give this help list", .group = -1 },
1435
{ .name = "usage", .key = -3,
1436
.doc = "Give a short usage message", .group = -1 },
1437
{ .name = "version", .key = 'V',
1438
.doc = "Print program version", .group = -1 },
1439
{ .name = NULL }
1440
};
1441
1442
error_t parse_opt(int key, char *arg,
1443
struct argp_state *state){
1444
errno = 0;
1445
switch(key){
1446
case 128: /* --debug */
1447
debug = true;
1448
break;
1449
case 'c': /* --connect */
1450
connect_to = arg;
1451
break;
1452
case 'i': /* --interface */
1453
interface = arg;
1454
break;
1455
case 's': /* --seckey */
1456
seckey = arg;
1457
break;
1458
case 'p': /* --pubkey */
1459
pubkey = arg;
1460
break;
1461
case 129: /* --dh-bits */
1462
errno = 0;
1463
tmpmax = strtoimax(arg, &tmp, 10);
1464
if(errno != 0 or tmp == arg or *tmp != '\0'
1465
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1466
argp_error(state, "Bad number of DH bits");
1467
}
1468
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1469
break;
1470
case 130: /* --priority */
1471
mc.priority = arg;
1472
break;
1473
case 131: /* --delay */
1474
errno = 0;
1475
delay = strtof(arg, &tmp);
1476
if(errno != 0 or tmp == arg or *tmp != '\0'){
1477
argp_error(state, "Bad delay");
1478
}
1479
case 132: /* --retry */
1480
errno = 0;
1481
retry_interval = strtod(arg, &tmp);
1482
if(errno != 0 or tmp == arg or *tmp != '\0'
1483
or (retry_interval * 1000) > INT_MAX
1484
or retry_interval < 0){
1485
argp_error(state, "Bad retry interval");
1486
}
1487
break;
1488
/*
1489
* These reproduce what we would get without ARGP_NO_HELP
1490
*/
1491
case '?': /* --help */
1492
argp_state_help(state, state->out_stream,
1493
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1494
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1495
case -3: /* --usage */
1496
argp_state_help(state, state->out_stream,
1497
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1498
case 'V': /* --version */
1499
fprintf(state->out_stream, "%s\n", argp_program_version);
1500
exit(argp_err_exit_status);
1501
break;
1502
default:
1503
return ARGP_ERR_UNKNOWN;
1504
}
1505
return errno;
1506
}
1507
1508
struct argp argp = { .options = options, .parser = parse_opt,
1509
.args_doc = "",
1510
.doc = "Mandos client -- Get and decrypt"
1511
" passwords from a Mandos server" };
1512
ret = argp_parse(&argp, argc, argv,
1513
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1514
switch(ret){
1515
case 0:
1516
break;
1517
case ENOMEM:
1518
default:
1519
errno = ret;
1520
perror_plus("argp_parse");
1521
exitcode = EX_OSERR;
1522
goto end;
1523
case EINVAL:
1524
exitcode = EX_USAGE;
1525
goto end;
1526
}
1527
}
1528
1529
{
1530
/* Work around Debian bug #633582:
1531
<http://bugs.debian.org/633582> */
1532
struct stat st;
1533
1534
/* Re-raise priviliges */
1535
errno = 0;
1536
ret = seteuid(0);
1537
if(ret == -1){
1538
perror_plus("seteuid");
1539
}
1540
1541
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1542
int seckey_fd = open(seckey, O_RDONLY);
1543
if(seckey_fd == -1){
1544
perror_plus("open");
1545
} else {
1546
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1547
if(ret == -1){
1548
perror_plus("fstat");
1549
} else {
1550
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1551
ret = fchown(seckey_fd, uid, gid);
1552
if(ret == -1){
1553
perror_plus("fchown");
1554
}
1555
}
1556
}
1557
TEMP_FAILURE_RETRY(close(seckey_fd));
1558
}
1559
}
1560
1561
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1562
int pubkey_fd = open(pubkey, O_RDONLY);
1563
if(pubkey_fd == -1){
1564
perror_plus("open");
1565
} else {
1566
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1567
if(ret == -1){
1568
perror_plus("fstat");
1569
} else {
1570
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1571
ret = fchown(pubkey_fd, uid, gid);
1572
if(ret == -1){
1573
perror_plus("fchown");
1574
}
1575
}
1576
}
1577
TEMP_FAILURE_RETRY(close(pubkey_fd));
1578
}
1579
}
1580
1581
/* Lower privileges */
1582
errno = 0;
1583
ret = seteuid(uid);
1584
if(ret == -1){
1585
perror_plus("seteuid");
1586
}
1587
}
1588
1589
/* Find network hooks and run them */
1590
{
1591
struct dirent **direntries;
1592
struct dirent *direntry;
1593
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1594
alphasort);
1595
int devnull = open("/dev/null", O_RDONLY);
1596
for(int i = 0; i < numhooks; i++){
1597
direntry = direntries[0];
1598
char *fullname = NULL;
1599
ret = asprintf(&fullname, "%s/%s", tempdir,
1600
direntry->d_name);
1601
if(ret < 0){
1602
perror_plus("asprintf");
1603
continue;
1604
}
1605
pid_t hook_pid = fork();
1606
if(hook_pid == 0){
1607
/* Child */
1608
dup2(devnull, STDIN_FILENO);
1609
close(devnull);
1610
dup2(STDERR_FILENO, STDOUT_FILENO);
1611
ret = setenv("DEVICE", interface, 1);
1612
if(ret == -1){
1613
perror_plus("setenv");
1614
exit(1);
1615
}
1616
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1617
if(ret == -1){
1618
perror_plus("setenv");
1619
exit(1);
1620
}
1621
ret = setenv("MODE", "start", 1);
1622
if(ret == -1){
1623
perror_plus("setenv");
1624
exit(1);
1625
}
1626
char *delaystring;
1627
ret = asprintf(&delaystring, "%f", delay);
1628
if(ret == -1){
1629
perror_plus("asprintf");
1630
exit(1);
1631
}
1632
ret = setenv("DELAY", delaystring, 1);
1633
if(ret == -1){
1634
free(delaystring);
1635
perror_plus("setenv");
1636
exit(1);
1637
}
1638
free(delaystring);
1639
ret = execl(fullname, direntry->d_name, "start", NULL);
1640
perror_plus("execl");
1641
}
1642
free(fullname);
1643
if(quit_now){
1644
goto end;
1645
}
1646
}
1647
close(devnull);
1648
}
1649
1650
if(not debug){
1651
avahi_set_log_function(empty_log);
1652
}
1653
1654
if(interface[0] == '\0'){
1655
struct dirent **direntries;
1656
/* First look for interfaces that are up */
1657
ret = scandir(sys_class_net, &direntries, up_interface,
1658
alphasort);
1659
if(ret == 0){
1660
/* No up interfaces, look for any good interfaces */
1661
free(direntries);
1662
ret = scandir(sys_class_net, &direntries, good_interface,
1663
alphasort);
1664
}
1665
if(ret >= 1){
1666
/* Pick the first interface returned */
1667
interface = strdup(direntries[0]->d_name);
1668
if(debug){
1669
fprintf(stderr, "Using interface \"%s\"\n", interface);
1670
}
1671
if(interface == NULL){
1672
perror_plus("malloc");
1673
free(direntries);
765
AvahiSServiceBrowser *sb = NULL;
766
int error;
767
int ret;
768
int exitcode = EXIT_SUCCESS;
769
const char *interface = "eth0";
770
struct ifreq network;
771
int sd;
772
uid_t uid;
773
gid_t gid;
774
char *connect_to = NULL;
775
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
776
const char *pubkeyfile = "pubkey.txt";
777
const char *seckeyfile = "seckey.txt";
778
mandos_context mc = { .simple_poll = NULL, .server = NULL,
779
.dh_bits = 1024, .priority = "SECURE256"};
780
bool gnutls_initalized = false;
781
782
{
783
struct argp_option options[] = {
784
{ .name = "debug", .key = 128,
785
.doc = "Debug mode", .group = 3 },
786
{ .name = "connect", .key = 'c',
787
.arg = "IP",
788
.doc = "Connect directly to a sepcified mandos server",
789
.group = 1 },
790
{ .name = "interface", .key = 'i',
791
.arg = "INTERFACE",
792
.doc = "Interface that Avahi will conntect through",
793
.group = 1 },
794
{ .name = "keydir", .key = 'd',
795
.arg = "KEYDIR",
796
.doc = "Directory where the openpgp keyring is",
797
.group = 1 },
798
{ .name = "seckey", .key = 's',
799
.arg = "SECKEY",
800
.doc = "Secret openpgp key for gnutls authentication",
801
.group = 1 },
802
{ .name = "pubkey", .key = 'p',
803
.arg = "PUBKEY",
804
.doc = "Public openpgp key for gnutls authentication",
805
.group = 2 },
806
{ .name = "dh-bits", .key = 129,
807
.arg = "BITS",
808
.doc = "dh-bits to use in gnutls communication",
809
.group = 2 },
810
{ .name = "priority", .key = 130,
811
.arg = "PRIORITY",
812
.doc = "GNUTLS priority", .group = 1 },
813
{ .name = NULL }
814
};
815
816
817
error_t parse_opt (int key, char *arg,
818
struct argp_state *state) {
819
/* Get the INPUT argument from `argp_parse', which we know is
820
a pointer to our plugin list pointer. */
821
switch (key) {
822
case 128:
823
debug = true;
824
break;
825
case 'c':
826
connect_to = arg;
827
break;
828
case 'i':
829
interface = arg;
830
break;
831
case 'd':
832
keydir = arg;
833
break;
834
case 's':
835
seckeyfile = arg;
836
break;
837
case 'p':
838
pubkeyfile = arg;
839
break;
840
case 129:
841
errno = 0;
842
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
843
if (errno){
844
perror("strtol");
845
exit(EXIT_FAILURE);
846
}
847
break;
848
case 130:
849
mc.priority = arg;
850
break;
851
case ARGP_KEY_ARG:
852
argp_usage (state);
853
break;
854
case ARGP_KEY_END:
855
break;
856
default:
857
return ARGP_ERR_UNKNOWN;
858
}
859
return 0;
860
}
861
862
struct argp argp = { .options = options, .parser = parse_opt,
863
.args_doc = "",
864
.doc = "Mandos client -- Get and decrypt"
865
" passwords from mandos server" };
866
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
867
if (ret == ARGP_ERR_UNKNOWN){
868
fprintf(stderr, "Unknown error while parsing arguments\n");
1674
869
exitcode = EXIT_FAILURE;
1675
870
goto end;
1676
871
}
1677
free(direntries);
872
}
873
874
pubkeyfile = combinepath(keydir, pubkeyfile);
875
if (pubkeyfile == NULL){
876
perror("combinepath");
877
exitcode = EXIT_FAILURE;
878
goto end;
879
}
880
881
seckeyfile = combinepath(keydir, seckeyfile);
882
if (seckeyfile == NULL){
883
perror("combinepath");
884
exitcode = EXIT_FAILURE;
885
goto end;
886
}
887
888
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
889
if (ret == -1){
890
fprintf(stderr, "init_gnutls_global failed\n");
891
exitcode = EXIT_FAILURE;
892
goto end;
1678
893
} else {
1679
free(direntries);
1680
fprintf(stderr, "Could not find a network interface\n");
1681
exitcode = EXIT_FAILURE;
1682
goto end;
1683
}
1684
}
1685
1686
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1687
from the signal handler */
1688
/* Initialize the pseudo-RNG for Avahi */
1689
srand((unsigned int) time(NULL));
1690
mc.simple_poll = avahi_simple_poll_new();
1691
if(mc.simple_poll == NULL){
1692
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1693
exitcode = EX_UNAVAILABLE;
1694
goto end;
1695
}
1696
1697
sigemptyset(&sigterm_action.sa_mask);
1698
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1699
if(ret == -1){
1700
perror_plus("sigaddset");
1701
exitcode = EX_OSERR;
1702
goto end;
1703
}
1704
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1705
if(ret == -1){
1706
perror_plus("sigaddset");
1707
exitcode = EX_OSERR;
1708
goto end;
1709
}
1710
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1711
if(ret == -1){
1712
perror_plus("sigaddset");
1713
exitcode = EX_OSERR;
1714
goto end;
1715
}
1716
/* Need to check if the handler is SIG_IGN before handling:
1717
| [[info:libc:Initial Signal Actions]] |
1718
| [[info:libc:Basic Signal Handling]] |
1719
*/
1720
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1721
if(ret == -1){
1722
perror_plus("sigaction");
1723
return EX_OSERR;
1724
}
1725
if(old_sigterm_action.sa_handler != SIG_IGN){
1726
ret = sigaction(SIGINT, &sigterm_action, NULL);
1727
if(ret == -1){
1728
perror_plus("sigaction");
1729
exitcode = EX_OSERR;
1730
goto end;
1731
}
1732
}
1733
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1734
if(ret == -1){
1735
perror_plus("sigaction");
1736
return EX_OSERR;
1737
}
1738
if(old_sigterm_action.sa_handler != SIG_IGN){
1739
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1740
if(ret == -1){
1741
perror_plus("sigaction");
1742
exitcode = EX_OSERR;
1743
goto end;
1744
}
1745
}
1746
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1747
if(ret == -1){
1748
perror_plus("sigaction");
1749
return EX_OSERR;
1750
}
1751
if(old_sigterm_action.sa_handler != SIG_IGN){
1752
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1753
if(ret == -1){
1754
perror_plus("sigaction");
1755
exitcode = EX_OSERR;
1756
goto end;
1757
}
1758
}
1759
1760
/* If the interface is down, bring it up */
1761
if(strcmp(interface, "none") != 0){
894
gnutls_initalized = true;
895
}
896
897
/* If the interface is down, bring it up */
898
{
899
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
900
if(sd < 0) {
901
perror("socket");
902
exitcode = EXIT_FAILURE;
903
goto end;
904
}
905
strcpy(network.ifr_name, interface); /* Spurious warning */
906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
907
if(ret == -1){
908
perror("ioctl SIOCGIFFLAGS");
909
exitcode = EXIT_FAILURE;
910
goto end;
911
}
912
if((network.ifr_flags & IFF_UP) == 0){
913
network.ifr_flags |= IFF_UP;
914
ret = ioctl(sd, SIOCSIFFLAGS, &network);
915
if(ret == -1){
916
perror("ioctl SIOCSIFFLAGS");
917
exitcode = EXIT_FAILURE;
918
goto end;
919
}
920
}
921
close(sd);
922
}
923
924
uid = getuid();
925
gid = getgid();
926
927
ret = setuid(uid);
928
if (ret == -1){
929
perror("setuid");
930
}
931
932
setgid(gid);
933
if (ret == -1){
934
perror("setgid");
935
}
936
1762
937
if_index = (AvahiIfIndex) if_nametoindex(interface);
1763
938
if(if_index == 0){
1764
939
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1765
exitcode = EX_UNAVAILABLE;
1766
goto end;
1767
}
1768
1769
if(quit_now){
1770
goto end;
1771
}
1772
1773
/* Re-raise priviliges */
1774
errno = 0;
1775
ret = seteuid(0);
1776
if(ret == -1){
1777
perror_plus("seteuid");
1778
}
1779
1780
#ifdef __linux__
1781
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1782
messages about the network interface to mess up the prompt */
1783
ret = klogctl(8, NULL, 5);
1784
bool restore_loglevel = true;
1785
if(ret == -1){
1786
restore_loglevel = false;
1787
perror_plus("klogctl");
1788
}
1789
#endif /* __linux__ */
1790
1791
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1792
if(sd < 0){
1793
perror_plus("socket");
1794
exitcode = EX_OSERR;
1795
#ifdef __linux__
1796
if(restore_loglevel){
1797
ret = klogctl(7, NULL, 0);
1798
if(ret == -1){
1799
perror_plus("klogctl");
1800
}
1801
}
1802
#endif /* __linux__ */
1803
/* Lower privileges */
1804
errno = 0;
1805
ret = seteuid(uid);
1806
if(ret == -1){
1807
perror_plus("seteuid");
1808
}
1809
goto end;
1810
}
1811
strcpy(network.ifr_name, interface);
1812
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1813
if(ret == -1){
1814
perror_plus("ioctl SIOCGIFFLAGS");
1815
#ifdef __linux__
1816
if(restore_loglevel){
1817
ret = klogctl(7, NULL, 0);
1818
if(ret == -1){
1819
perror_plus("klogctl");
1820
}
1821
}
1822
#endif /* __linux__ */
1823
exitcode = EX_OSERR;
1824
/* Lower privileges */
1825
errno = 0;
1826
ret = seteuid(uid);
1827
if(ret == -1){
1828
perror_plus("seteuid");
1829
}
1830
goto end;
1831
}
1832
if((network.ifr_flags & IFF_UP) == 0){
1833
network.ifr_flags |= IFF_UP;
1834
take_down_interface = true;
1835
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1836
if(ret == -1){
1837
take_down_interface = false;
1838
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1839
exitcode = EX_OSERR;
1840
#ifdef __linux__
1841
if(restore_loglevel){
1842
ret = klogctl(7, NULL, 0);
1843
if(ret == -1){
1844
perror_plus("klogctl");
1845
}
1846
}
1847
#endif /* __linux__ */
1848
/* Lower privileges */
1849
errno = 0;
1850
ret = seteuid(uid);
1851
if(ret == -1){
1852
perror_plus("seteuid");
1853
}
1854
goto end;
1855
}
1856
}
1857
/* Sleep checking until interface is running.
1858
Check every 0.25s, up to total time of delay */
1859
for(int i=0; i < delay * 4; i++){
1860
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1861
if(ret == -1){
1862
perror_plus("ioctl SIOCGIFFLAGS");
1863
} else if(network.ifr_flags & IFF_RUNNING){
1864
break;
1865
}
1866
struct timespec sleeptime = { .tv_nsec = 250000000 };
1867
ret = nanosleep(&sleeptime, NULL);
1868
if(ret == -1 and errno != EINTR){
1869
perror_plus("nanosleep");
1870
}
1871
}
1872
if(not take_down_interface){
1873
/* We won't need the socket anymore */
1874
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1875
if(ret == -1){
1876
perror_plus("close");
1877
}
1878
}
1879
#ifdef __linux__
1880
if(restore_loglevel){
1881
/* Restores kernel loglevel to default */
1882
ret = klogctl(7, NULL, 0);
1883
if(ret == -1){
1884
perror_plus("klogctl");
1885
}
1886
}
1887
#endif /* __linux__ */
1888
/* Lower privileges */
1889
errno = 0;
1890
if(take_down_interface){
1891
/* Lower privileges */
1892
ret = seteuid(uid);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
} else {
1897
/* Lower privileges permanently */
1898
ret = setuid(uid);
1899
if(ret == -1){
1900
perror_plus("setuid");
1901
}
1902
}
1903
}
1904
1905
if(quit_now){
1906
goto end;
1907
}
1908
1909
ret = init_gnutls_global(pubkey, seckey);
1910
if(ret == -1){
1911
fprintf(stderr, "init_gnutls_global failed\n");
1912
exitcode = EX_UNAVAILABLE;
1913
goto end;
1914
} else {
1915
gnutls_initialized = true;
1916
}
1917
1918
if(quit_now){
1919
goto end;
1920
}
1921
1922
if(mkdtemp(tempdir) == NULL){
1923
perror_plus("mkdtemp");
1924
goto end;
1925
}
1926
tempdir_created = true;
1927
1928
if(quit_now){
1929
goto end;
1930
}
1931
1932
if(not init_gpgme(pubkey, seckey, tempdir)){
1933
fprintf(stderr, "init_gpgme failed\n");
1934
exitcode = EX_UNAVAILABLE;
1935
goto end;
1936
} else {
1937
gpgme_initialized = true;
1938
}
1939
1940
if(quit_now){
1941
goto end;
1942
}
1943
1944
if(connect_to != NULL){
1945
/* Connect directly, do not use Zeroconf */
1946
/* (Mainly meant for debugging) */
1947
char *address = strrchr(connect_to, ':');
1948
if(address == NULL){
1949
fprintf(stderr, "No colon in address\n");
1950
exitcode = EX_USAGE;
1951
goto end;
1952
}
1953
1954
if(quit_now){
1955
goto end;
1956
}
1957
1958
uint16_t port;
1959
errno = 0;
1960
tmpmax = strtoimax(address+1, &tmp, 10);
1961
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1962
or tmpmax != (uint16_t)tmpmax){
1963
fprintf(stderr, "Bad port number\n");
1964
exitcode = EX_USAGE;
1965
goto end;
1966
}
1967
1968
if(quit_now){
1969
goto end;
1970
}
1971
1972
port = (uint16_t)tmpmax;
1973
*address = '\0';
1974
/* Colon in address indicates IPv6 */
1975
int af;
1976
if(strchr(connect_to, ':') != NULL){
1977
af = AF_INET6;
1978
/* Accept [] around IPv6 address - see RFC 5952 */
1979
if(connect_to[0] == '[' and address[-1] == ']')
1980
{
1981
connect_to++;
1982
address[-1] = '\0';
1983
}
1984
} else {
1985
af = AF_INET;
1986
}
1987
address = connect_to;
1988
1989
if(quit_now){
1990
goto end;
1991
}
1992
1993
while(not quit_now){
1994
ret = start_mandos_communication(address, port, if_index, af);
1995
if(quit_now or ret == 0){
1996
break;
1997
}
1998
if(debug){
1999
fprintf(stderr, "Retrying in %d seconds\n",
2000
(int)retry_interval);
2001
}
2002
sleep((int)retry_interval);
2003
}
2004
2005
if (not quit_now){
2006
exitcode = EXIT_SUCCESS;
2007
}
2008
2009
goto end;
2010
}
2011
2012
if(quit_now){
2013
goto end;
2014
}
2015
2016
{
2017
AvahiServerConfig config;
2018
/* Do not publish any local Zeroconf records */
2019
avahi_server_config_init(&config);
2020
config.publish_hinfo = 0;
2021
config.publish_addresses = 0;
2022
config.publish_workstation = 0;
2023
config.publish_domain = 0;
2024
2025
/* Allocate a new server */
2026
mc.server = avahi_server_new(avahi_simple_poll_get
2027
(mc.simple_poll), &config, NULL,
2028
NULL, &error);
2029
2030
/* Free the Avahi configuration data */
2031
avahi_server_config_free(&config);
2032
}
2033
2034
/* Check if creating the Avahi server object succeeded */
2035
if(mc.server == NULL){
2036
fprintf(stderr, "Failed to create Avahi server: %s\n",
2037
avahi_strerror(error));
2038
exitcode = EX_UNAVAILABLE;
2039
goto end;
2040
}
2041
2042
if(quit_now){
2043
goto end;
2044
}
2045
2046
/* Create the Avahi service browser */
2047
sb = avahi_s_service_browser_new(mc.server, if_index,
2048
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2049
NULL, 0, browse_callback, NULL);
2050
if(sb == NULL){
2051
fprintf(stderr, "Failed to create service browser: %s\n",
2052
avahi_strerror(avahi_server_errno(mc.server)));
2053
exitcode = EX_UNAVAILABLE;
2054
goto end;
2055
}
2056
2057
if(quit_now){
2058
goto end;
2059
}
2060
2061
/* Run the main loop */
2062
2063
if(debug){
2064
fprintf(stderr, "Starting Avahi loop search\n");
2065
}
2066
2067
ret = avahi_loop_with_timeout(mc.simple_poll,
2068
(int)(retry_interval * 1000));
2069
if(debug){
2070
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2071
(ret == 0) ? "successfully" : "with error");
2072
}
2073
940
exit(EXIT_FAILURE);
941
}
942
943
if(connect_to != NULL){
944
/* Connect directly, do not use Zeroconf */
945
/* (Mainly meant for debugging) */
946
char *address = strrchr(connect_to, ':');
947
if(address == NULL){
948
fprintf(stderr, "No colon in address\n");
949
exitcode = EXIT_FAILURE;
950
goto end;
951
}
952
errno = 0;
953
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
954
if(errno){
955
perror("Bad port number");
956
exitcode = EXIT_FAILURE;
957
goto end;
958
}
959
*address = '\0';
960
address = connect_to;
961
ret = start_mandos_communication(address, port, if_index, &mc);
962
if(ret < 0){
963
exitcode = EXIT_FAILURE;
964
} else {
965
exitcode = EXIT_SUCCESS;
966
}
967
goto end;
968
}
969
970
if (not debug){
971
avahi_set_log_function(empty_log);
972
}
973
974
/* Initialize the pseudo-RNG for Avahi */
975
srand((unsigned int) time(NULL));
976
977
/* Allocate main Avahi loop object */
978
mc.simple_poll = avahi_simple_poll_new();
979
if (mc.simple_poll == NULL) {
980
fprintf(stderr, "Avahi: Failed to create simple poll"
981
" object.\n");
982
exitcode = EXIT_FAILURE;
983
goto end;
984
}
985
986
{
987
AvahiServerConfig config;
988
/* Do not publish any local Zeroconf records */
989
avahi_server_config_init(&config);
990
config.publish_hinfo = 0;
991
config.publish_addresses = 0;
992
config.publish_workstation = 0;
993
config.publish_domain = 0;
994
995
/* Allocate a new server */
996
mc.server = avahi_server_new(avahi_simple_poll_get
997
(mc.simple_poll), &config, NULL,
998
NULL, &error);
999
1000
/* Free the Avahi configuration data */
1001
avahi_server_config_free(&config);
1002
}
1003
1004
/* Check if creating the Avahi server object succeeded */
1005
if (mc.server == NULL) {
1006
fprintf(stderr, "Failed to create Avahi server: %s\n",
1007
avahi_strerror(error));
1008
exitcode = EXIT_FAILURE;
1009
goto end;
1010
}
1011
1012
/* Create the Avahi service browser */
1013
sb = avahi_s_service_browser_new(mc.server, if_index,
1014
AVAHI_PROTO_INET6,
1015
"_mandos._tcp", NULL, 0,
1016
browse_callback, &mc);
1017
if (sb == NULL) {
1018
fprintf(stderr, "Failed to create service browser: %s\n",
1019
avahi_strerror(avahi_server_errno(mc.server)));
1020
exitcode = EXIT_FAILURE;
1021
goto end;
1022
}
1023
1024
/* Run the main loop */
1025
1026
if (debug){
1027
fprintf(stderr, "Starting Avahi loop search\n");
1028
}
1029
1030
avahi_simple_poll_loop(mc.simple_poll);
1031
2074
1032
end:
2075
2076
if(debug){
2077
fprintf(stderr, "%s exiting\n", argv[0]);
2078
}
2079
2080
/* Cleanup things */
2081
if(sb != NULL)
2082
avahi_s_service_browser_free(sb);
2083
2084
if(mc.server != NULL)
2085
avahi_server_free(mc.server);
2086
2087
if(mc.simple_poll != NULL)
2088
avahi_simple_poll_free(mc.simple_poll);
2089
2090
if(gnutls_initialized){
2091
gnutls_certificate_free_credentials(mc.cred);
2092
gnutls_global_deinit();
2093
gnutls_dh_params_deinit(mc.dh_params);
2094
}
2095
2096
if(gpgme_initialized){
2097
gpgme_release(mc.ctx);
2098
}
2099
2100
/* Cleans up the circular linked list of Mandos servers the client
2101
has seen */
2102
if(mc.current_server != NULL){
2103
mc.current_server->prev->next = NULL;
2104
while(mc.current_server != NULL){
2105
server *next = mc.current_server->next;
2106
free(mc.current_server);
2107
mc.current_server = next;
2108
}
2109
}
2110
2111
/* XXX run network hooks "stop" here */
2112
2113
/* Take down the network interface */
2114
if(take_down_interface){
2115
/* Re-raise priviliges */
2116
errno = 0;
2117
ret = seteuid(0);
2118
if(ret == -1){
2119
perror_plus("seteuid");
2120
}
2121
if(geteuid() == 0){
2122
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2123
if(ret == -1){
2124
perror_plus("ioctl SIOCGIFFLAGS");
2125
} else if(network.ifr_flags & IFF_UP) {
2126
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2127
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2128
if(ret == -1){
2129
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2130
}
2131
}
2132
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2133
if(ret == -1){
2134
perror_plus("close");
2135
}
2136
/* Lower privileges permanently */
2137
errno = 0;
2138
ret = setuid(uid);
2139
if(ret == -1){
2140
perror_plus("setuid");
2141
}
2142
}
2143
}
2144
2145
/* Removes the GPGME temp directory and all files inside */
2146
if(tempdir_created){
2147
struct dirent **direntries = NULL;
2148
struct dirent *direntry = NULL;
2149
int numentries = scandir(tempdir, &direntries, notdotentries,
2150
alphasort);
2151
if (numentries > 0){
2152
for(int i = 0; i < numentries; i++){
2153
direntry = direntries[i];
2154
char *fullname = NULL;
2155
ret = asprintf(&fullname, "%s/%s", tempdir,
2156
direntry->d_name);
2157
if(ret < 0){
2158
perror_plus("asprintf");
2159
continue;
2160
}
2161
ret = remove(fullname);
2162
if(ret == -1){
2163
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2164
strerror(errno));
2165
}
2166
free(fullname);
2167
}
2168
}
2169
2170
/* need to clean even if 0 because man page doesn't specify */
2171
free(direntries);
2172
if (numentries == -1){
2173
perror_plus("scandir");
2174
}
2175
ret = rmdir(tempdir);
2176
if(ret == -1 and errno != ENOENT){
2177
perror_plus("rmdir");
2178
}
2179
}
2180
2181
if(quit_now){
2182
sigemptyset(&old_sigterm_action.sa_mask);
2183
old_sigterm_action.sa_handler = SIG_DFL;
2184
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2185
&old_sigterm_action,
2186
NULL));
2187
if(ret == -1){
2188
perror_plus("sigaction");
2189
}
2190
do {
2191
ret = raise(signal_received);
2192
} while(ret != 0 and errno == EINTR);
2193
if(ret != 0){
2194
perror_plus("raise");
2195
abort();
2196
}
2197
TEMP_FAILURE_RETRY(pause());
2198
}
2199
2200
return exitcode;
1033
1034
if (debug){
1035
fprintf(stderr, "%s exiting\n", argv[0]);
1036
}
1037
1038
/* Cleanup things */
1039
if (sb != NULL)
1040
avahi_s_service_browser_free(sb);
1041
1042
if (mc.server != NULL)
1043
avahi_server_free(mc.server);
1044
1045
if (mc.simple_poll != NULL)
1046
avahi_simple_poll_free(mc.simple_poll);
1047
free(pubkeyfile);
1048
free(seckeyfile);
1049
1050
if (gnutls_initalized){
1051
gnutls_certificate_free_credentials(mc.cred);
1052
gnutls_global_deinit ();
1053
}
1054
1055
return exitcode;
2201
1056
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0