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- Committer: Teddy Hogeborn
- Date: 2009-02-07 04:50:39 UTC
- Revision ID: teddy@fukt.bsnet.se-20090207045039-xkr6b80vtqwqrq8l
* Makefile (install-client-nokey): Move "initramfs-tools-script" from
"/scripts/local-top/mandos" to
"/scripts/init-premount/mandos".
(uninstall-client): - '' -
* debian/mandos-client.dirs: - '' -
* initramfs-tools-script (PREREQ): Added "udev".
"/scripts/local-top/mandos" to
"/scripts/init-premount/mandos".
(uninstall-client): - '' -
* debian/mandos-client.dirs: - '' -
* initramfs-tools-script (PREREQ): Added "udev".
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
stdout, ferror(), sscanf(),
40
remove() */
44
41
#include <stdint.h> /* uint16_t, uint32_t */
45
42
#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 */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/ioctl.h> /* ioctl */
52
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
50
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
53
DIR */
54
#include <sys/stat.h> /* open() */
57
55
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
56
struct in6_addr, inet_pton(),
57
connect() */
59
58
#include <fcntl.h> /* open() */
60
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
60
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
62
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
63
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* nanosleep(), time() */
68
65
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
66
SIOCSIFFLAGS, if_indextoname(),
70
67
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
68
#include <netinet/in.h>
74
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
79
74
#include <argp.h> /* struct argp_option, error_t, struct
80
75
argp_state, struct argp,
81
76
argp_parse(), ARGP_KEY_ARG,
82
77
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
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
92
78
#ifdef __linux__
93
79
#include <sys/klog.h> /* klogctl() */
94
#endif /* __linux__ */
80
#endif
95
81
96
82
/* Avahi */
97
83
/* All Avahi types, constants and functions
111
97
init_gnutls_session(),
112
98
GNUTLS_* */
113
99
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
100
/* gnutls_certificate_set_openpgp_key_file(),
101
GNUTLS_OPENPGP_FMT_BASE64 */
116
102
117
103
/* GPGME */
118
104
#include <gpgme.h> /* All GPGME types, constants and
126
112
#define PATHDIR "/conf/conf.d/mandos"
127
113
#define SECKEY "seckey.txt"
128
114
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
115
131
116
bool debug = false;
132
117
static const char mandos_protocol_version[] = "1";
133
118
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
static const char sys_class_net[] = "/sys/class/net";
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
139
/* Doubly linked list that need to be circularly linked when used */
140
typedef struct server{
141
const char *ip;
142
uint16_t port;
143
AvahiIfIndex if_index;
144
int af;
145
struct timespec last_seen;
146
struct server *next;
147
struct server *prev;
148
} server;
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
149
120
150
121
/* Used for passing in values through the Avahi callback functions */
151
122
typedef struct {
156
127
gnutls_dh_params_t dh_params;
157
128
const char *priority;
158
129
gpgme_ctx_t ctx;
159
server *current_server;
160
130
} mandos_context;
161
131
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
167
168
sig_atomic_t quit_now = 0;
169
int signal_received = 0;
170
171
/* Function to use when printing errors */
172
void perror_plus(const char *print_text){
173
fprintf(stderr, "Mandos plugin %s: ",
174
program_invocation_short_name);
175
perror(print_text);
176
}
177
178
int fprintf_plus(FILE *stream, const char *format, ...){
179
va_list ap;
180
va_start (ap, format);
181
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
185
}
186
187
132
/*
188
* Make additional room in "buffer" for at least BUFFER_SIZE more
189
* bytes. "buffer_capacity" is how much is currently allocated,
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
190
135
* "buffer_length" is how much is already used.
191
136
*/
192
size_t incbuffer(char **buffer, size_t buffer_length,
193
size_t buffer_capacity){
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
138
size_t buffer_capacity){
194
139
if(buffer_length + BUFFER_SIZE > buffer_capacity){
195
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
196
141
if(buffer == NULL){
201
146
return buffer_capacity;
202
147
}
203
148
204
/* Add server to set of servers to retry periodically */
205
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
206
int af){
207
int ret;
208
server *new_server = malloc(sizeof(server));
209
if(new_server == NULL){
210
perror_plus("malloc");
211
return false;
212
}
213
*new_server = (server){ .ip = strdup(ip),
214
.port = port,
215
.if_index = if_index,
216
.af = af };
217
if(new_server->ip == NULL){
218
perror_plus("strdup");
219
return false;
220
}
221
/* Special case of first server */
222
if (mc.current_server == NULL){
223
new_server->next = new_server;
224
new_server->prev = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
227
} else {
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
230
new_server->prev->next = new_server;
231
mc.current_server->prev = new_server;
232
}
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
if(ret == -1){
235
perror_plus("clock_gettime");
236
return false;
237
}
238
return true;
239
}
240
241
149
/*
242
150
* Initialize GPGME.
243
151
*/
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
153
const char *pubkey, const char *tempdir){
154
int ret;
246
155
gpgme_error_t rc;
247
156
gpgme_engine_info_t engine_info;
248
157
251
160
* Helper function to insert pub and seckey to the engine keyring.
252
161
*/
253
162
bool import_key(const char *filename){
254
int ret;
255
163
int fd;
256
164
gpgme_data_t pgp_data;
257
165
258
166
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
259
167
if(fd == -1){
260
perror_plus("open");
168
perror("open");
261
169
return false;
262
170
}
263
171
264
172
rc = gpgme_data_new_from_fd(&pgp_data, fd);
265
173
if(rc != GPG_ERR_NO_ERROR){
266
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
268
176
return false;
269
177
}
270
178
271
rc = gpgme_op_import(mc.ctx, pgp_data);
179
rc = gpgme_op_import(mc->ctx, pgp_data);
272
180
if(rc != GPG_ERR_NO_ERROR){
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
gpgme_strsource(rc), gpgme_strerror(rc));
275
183
return false;
276
184
}
277
185
278
186
ret = (int)TEMP_FAILURE_RETRY(close(fd));
279
187
if(ret == -1){
280
perror_plus("close");
188
perror("close");
281
189
}
282
190
gpgme_data_release(pgp_data);
283
191
return true;
284
192
}
285
193
286
194
if(debug){
287
fprintf_plus(stderr, "Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
288
196
}
289
197
290
198
/* Init GPGME */
291
199
gpgme_check_version(NULL);
292
200
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
293
201
if(rc != GPG_ERR_NO_ERROR){
294
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
296
204
return false;
297
205
}
298
206
299
/* Set GPGME home directory for the OpenPGP engine only */
207
/* Set GPGME home directory for the OpenPGP engine only */
300
208
rc = gpgme_get_engine_info(&engine_info);
301
209
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
211
gpgme_strsource(rc), gpgme_strerror(rc));
304
212
return false;
305
213
}
306
214
while(engine_info != NULL){
312
220
engine_info = engine_info->next;
313
221
}
314
222
if(engine_info == NULL){
315
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
316
tempdir);
223
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
317
224
return false;
318
225
}
319
226
320
227
/* Create new GPGME "context" */
321
rc = gpgme_new(&(mc.ctx));
228
rc = gpgme_new(&(mc->ctx));
322
229
if(rc != GPG_ERR_NO_ERROR){
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
325
gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
326
232
return false;
327
233
}
328
234
330
236
return false;
331
237
}
332
238
333
return true;
239
return true;
334
240
}
335
241
336
242
/*
337
243
* Decrypt OpenPGP data.
338
244
* Returns -1 on error
339
245
*/
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
341
248
size_t crypto_size,
342
249
char **plaintext){
343
250
gpgme_data_t dh_crypto, dh_plain;
347
254
ssize_t plaintext_length = 0;
348
255
349
256
if(debug){
350
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
257
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
351
258
}
352
259
353
260
/* Create new GPGME data buffer from memory cryptotext */
354
261
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
355
262
0);
356
263
if(rc != GPG_ERR_NO_ERROR){
357
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
358
gpgme_strsource(rc), gpgme_strerror(rc));
264
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
359
266
return -1;
360
267
}
361
268
362
269
/* Create new empty GPGME data buffer for the plaintext */
363
270
rc = gpgme_data_new(&dh_plain);
364
271
if(rc != GPG_ERR_NO_ERROR){
365
fprintf_plus(stderr, "Mandos plugin mandos-client: "
366
"bad gpgme_data_new: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
272
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
368
274
gpgme_data_release(dh_crypto);
369
275
return -1;
370
276
}
371
277
372
278
/* Decrypt data from the cryptotext data buffer to the plaintext
373
279
data buffer */
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
375
281
if(rc != GPG_ERR_NO_ERROR){
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
gpgme_strsource(rc), gpgme_strerror(rc));
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
378
284
plaintext_length = -1;
379
285
if(debug){
380
286
gpgme_decrypt_result_t result;
381
result = gpgme_op_decrypt_result(mc.ctx);
287
result = gpgme_op_decrypt_result(mc->ctx);
382
288
if(result == NULL){
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
384
290
} else {
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
388
result->wrong_key_usage);
291
fprintf(stderr, "Unsupported algorithm: %s\n",
292
result->unsupported_algorithm);
293
fprintf(stderr, "Wrong key usage: %u\n",
294
result->wrong_key_usage);
389
295
if(result->file_name != NULL){
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
296
fprintf(stderr, "File name: %s\n", result->file_name);
391
297
}
392
298
gpgme_recipient_t recipient;
393
299
recipient = result->recipients;
394
while(recipient != NULL){
395
fprintf_plus(stderr, "Public key algorithm: %s\n",
396
gpgme_pubkey_algo_name
397
(recipient->pubkey_algo));
398
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
399
fprintf_plus(stderr, "Secret key available: %s\n",
400
recipient->status == GPG_ERR_NO_SECKEY
401
? "No" : "Yes");
402
recipient = recipient->next;
300
if(recipient){
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
307
? "No" : "Yes");
308
recipient = recipient->next;
309
}
403
310
}
404
311
}
405
312
}
407
314
}
408
315
409
316
if(debug){
410
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
317
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
411
318
}
412
319
413
320
/* Seek back to the beginning of the GPGME plaintext data buffer */
414
321
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
415
perror_plus("gpgme_data_seek");
322
perror("gpgme_data_seek");
416
323
plaintext_length = -1;
417
324
goto decrypt_end;
418
325
}
419
326
420
327
*plaintext = NULL;
421
328
while(true){
422
plaintext_capacity = incbuffer(plaintext,
423
(size_t)plaintext_length,
424
plaintext_capacity);
329
plaintext_capacity = adjustbuffer(plaintext,
330
(size_t)plaintext_length,
331
plaintext_capacity);
425
332
if(plaintext_capacity == 0){
426
perror_plus("incbuffer");
427
plaintext_length = -1;
428
goto decrypt_end;
333
perror("adjustbuffer");
334
plaintext_length = -1;
335
goto decrypt_end;
429
336
}
430
337
431
338
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
436
343
break;
437
344
}
438
345
if(ret < 0){
439
perror_plus("gpgme_data_read");
346
perror("gpgme_data_read");
440
347
plaintext_length = -1;
441
348
goto decrypt_end;
442
349
}
444
351
}
445
352
446
353
if(debug){
447
fprintf_plus(stderr, "Decrypted password is: ");
354
fprintf(stderr, "Decrypted password is: ");
448
355
for(ssize_t i = 0; i < plaintext_length; i++){
449
356
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
450
357
}
472
379
/* GnuTLS log function callback */
473
380
static void debuggnutls(__attribute__((unused)) int level,
474
381
const char* string){
475
fprintf_plus(stderr, "GnuTLS: %s", string);
382
fprintf(stderr, "GnuTLS: %s", string);
476
383
}
477
384
478
static int init_gnutls_global(const char *pubkeyfilename,
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
479
387
const char *seckeyfilename){
480
388
int ret;
481
389
482
390
if(debug){
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
391
fprintf(stderr, "Initializing GnuTLS\n");
484
392
}
485
393
486
394
ret = gnutls_global_init();
487
395
if(ret != GNUTLS_E_SUCCESS){
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
396
fprintf(stderr, "GnuTLS global_init: %s\n",
397
safer_gnutls_strerror(ret));
490
398
return -1;
491
399
}
492
400
499
407
}
500
408
501
409
/* OpenPGP credentials */
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
503
411
if(ret != GNUTLS_E_SUCCESS){
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
* from
414
* -Wunreachable-code
415
*/
416
safer_gnutls_strerror(ret));
506
417
gnutls_global_deinit();
507
418
return -1;
508
419
}
509
420
510
421
if(debug){
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" secret key %s as GnuTLS credentials\n",
513
pubkeyfilename,
514
seckeyfilename);
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
424
seckeyfilename);
515
425
}
516
426
517
427
ret = gnutls_certificate_set_openpgp_key_file
518
(mc.cred, pubkeyfilename, seckeyfilename,
428
(mc->cred, pubkeyfilename, seckeyfilename,
519
429
GNUTLS_OPENPGP_FMT_BASE64);
520
430
if(ret != GNUTLS_E_SUCCESS){
521
fprintf_plus(stderr,
522
"Error[%d] while reading the OpenPGP key pair ('%s',"
523
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
524
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
525
safer_gnutls_strerror(ret));
431
fprintf(stderr,
432
"Error[%d] while reading the OpenPGP key pair ('%s',"
433
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
526
436
goto globalfail;
527
437
}
528
438
529
439
/* GnuTLS server initialization */
530
ret = gnutls_dh_params_init(&mc.dh_params);
440
ret = gnutls_dh_params_init(&mc->dh_params);
531
441
if(ret != GNUTLS_E_SUCCESS){
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
" initialization: %s\n",
534
safer_gnutls_strerror(ret));
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
" %s\n", safer_gnutls_strerror(ret));
535
444
goto globalfail;
536
445
}
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
538
447
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
safer_gnutls_strerror(ret));
541
450
goto globalfail;
542
451
}
543
452
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
545
454
546
455
return 0;
547
456
548
457
globalfail:
549
458
550
gnutls_certificate_free_credentials(mc.cred);
459
gnutls_certificate_free_credentials(mc->cred);
551
460
gnutls_global_deinit();
552
gnutls_dh_params_deinit(mc.dh_params);
461
gnutls_dh_params_deinit(mc->dh_params);
553
462
return -1;
554
463
}
555
464
556
static int init_gnutls_session(gnutls_session_t *session){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
557
467
int ret;
558
468
/* GnuTLS session creation */
559
do {
560
ret = gnutls_init(session, GNUTLS_SERVER);
561
if(quit_now){
562
return -1;
563
}
564
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
469
ret = gnutls_init(session, GNUTLS_SERVER);
565
470
if(ret != GNUTLS_E_SUCCESS){
566
fprintf_plus(stderr,
567
"Error in GnuTLS session initialization: %s\n",
568
safer_gnutls_strerror(ret));
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
safer_gnutls_strerror(ret));
569
473
}
570
474
571
475
{
572
476
const char *err;
573
do {
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
575
if(quit_now){
576
gnutls_deinit(*session);
577
return -1;
578
}
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
580
478
if(ret != GNUTLS_E_SUCCESS){
581
fprintf_plus(stderr, "Syntax error at: %s\n", err);
582
fprintf_plus(stderr, "GnuTLS error: %s\n",
583
safer_gnutls_strerror(ret));
479
fprintf(stderr, "Syntax error at: %s\n", err);
480
fprintf(stderr, "GnuTLS error: %s\n",
481
safer_gnutls_strerror(ret));
584
482
gnutls_deinit(*session);
585
483
return -1;
586
484
}
587
485
}
588
486
589
do {
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
591
mc.cred);
592
if(quit_now){
593
gnutls_deinit(*session);
594
return -1;
595
}
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
597
489
if(ret != GNUTLS_E_SUCCESS){
598
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
599
safer_gnutls_strerror(ret));
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
safer_gnutls_strerror(ret));
600
492
gnutls_deinit(*session);
601
493
return -1;
602
494
}
603
495
604
496
/* ignore client certificate if any. */
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
606
499
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
608
501
609
502
return 0;
610
503
}
616
509
/* Called when a Mandos server is found */
617
510
static int start_mandos_communication(const char *ip, uint16_t port,
618
511
AvahiIfIndex if_index,
619
int af){
620
int ret, tcp_sd = -1;
512
mandos_context *mc){
513
int ret, tcp_sd;
621
514
ssize_t sret;
622
union {
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
625
} to;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
626
516
char *buffer = NULL;
627
char *decrypted_buffer = NULL;
517
char *decrypted_buffer;
628
518
size_t buffer_length = 0;
629
519
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
630
521
size_t written;
631
int retval = -1;
522
int retval = 0;
523
char interface[IF_NAMESIZE];
632
524
gnutls_session_t session;
633
int pf; /* Protocol family */
634
635
errno = 0;
636
637
if(quit_now){
638
errno = EINTR;
639
return -1;
640
}
641
642
switch(af){
643
case AF_INET6:
644
pf = PF_INET6;
645
break;
646
case AF_INET:
647
pf = PF_INET;
648
break;
649
default:
650
fprintf_plus(stderr, "Bad address family: %d\n", af);
651
errno = EINVAL;
652
return -1;
653
}
654
655
ret = init_gnutls_session(&session);
525
526
ret = init_gnutls_session(mc, &session);
656
527
if(ret != 0){
657
528
return -1;
658
529
}
659
530
660
531
if(debug){
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
533
"\n", ip, port);
663
534
}
664
535
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
666
537
if(tcp_sd < 0){
667
int e = errno;
668
perror_plus("socket");
669
errno = e;
670
goto mandos_end;
538
perror("socket");
539
return -1;
671
540
}
672
541
673
if(quit_now){
674
errno = EINTR;
675
goto mandos_end;
542
if(debug){
543
if(if_indextoname((unsigned int)if_index, interface) == NULL){
544
perror("if_indextoname");
545
return -1;
546
}
547
fprintf(stderr, "Binding to interface %s\n", interface);
676
548
}
677
549
678
550
memset(&to, 0, sizeof(to));
679
if(af == AF_INET6){
680
to.in6.sin6_family = (sa_family_t)af;
681
ret = inet_pton(af, ip, &to.in6.sin6_addr);
682
} else { /* IPv4 */
683
to.in.sin_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in.sin_addr);
685
}
551
to.in6.sin6_family = AF_INET6;
552
/* It would be nice to have a way to detect if we were passed an
553
IPv4 address here. Now we assume an IPv6 address. */
554
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
686
555
if(ret < 0 ){
687
int e = errno;
688
perror_plus("inet_pton");
689
errno = e;
690
goto mandos_end;
556
perror("inet_pton");
557
return -1;
691
558
}
692
559
if(ret == 0){
693
int e = errno;
694
fprintf_plus(stderr, "Bad address: %s\n", ip);
695
errno = e;
696
goto mandos_end;
560
fprintf(stderr, "Bad address: %s\n", ip);
561
return -1;
697
562
}
698
if(af == AF_INET6){
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wconversion and
701
-Wunreachable-code */
702
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
-Wunreachable-code*/
706
if(if_index == AVAHI_IF_UNSPEC){
707
fprintf_plus(stderr, "An IPv6 link-local address is"
708
" incomplete without a network interface\n");
709
errno = EINVAL;
710
goto mandos_end;
711
}
712
/* Set the network interface number as scope */
713
to.in6.sin6_scope_id = (uint32_t)if_index;
714
}
715
} else {
716
to.in.sin_port = htons(port); /* Spurious warnings from
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
717
564
-Wconversion and
718
565
-Wunreachable-code */
719
}
720
566
721
if(quit_now){
722
errno = EINTR;
723
goto mandos_end;
724
}
567
to.in6.sin6_scope_id = (uint32_t)if_index;
725
568
726
569
if(debug){
727
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
728
char interface[IF_NAMESIZE];
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
730
perror_plus("if_indextoname");
731
} else {
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
734
}
735
} else {
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
737
ip, port);
738
}
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
741
const char *pcret;
742
if(af == AF_INET6){
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
744
sizeof(addrstr));
745
} else {
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
747
sizeof(addrstr));
748
}
749
if(pcret == NULL){
750
perror_plus("inet_ntop");
570
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
571
port);
572
char addrstr[INET6_ADDRSTRLEN] = "";
573
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
574
sizeof(addrstr)) == NULL){
575
perror("inet_ntop");
751
576
} else {
752
577
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
578
fprintf(stderr, "Canonical address form: %s\n", addrstr);
754
579
}
755
580
}
756
581
}
757
582
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
761
}
762
763
if(af == AF_INET6){
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
765
} else {
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
767
}
583
ret = connect(tcp_sd, &to.in, sizeof(to));
768
584
if(ret < 0){
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
int e = errno;
771
perror_plus("connect");
772
errno = e;
773
}
774
goto mandos_end;
775
}
776
777
if(quit_now){
778
errno = EINTR;
779
goto mandos_end;
585
perror("connect");
586
return -1;
780
587
}
781
588
782
589
const char *out = mandos_protocol_version;
784
591
while(true){
785
592
size_t out_size = strlen(out);
786
593
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
787
out_size - written));
594
out_size - written));
788
595
if(ret == -1){
789
int e = errno;
790
perror_plus("write");
791
errno = e;
596
perror("write");
597
retval = -1;
792
598
goto mandos_end;
793
599
}
794
600
written += (size_t)ret;
802
608
break;
803
609
}
804
610
}
805
806
if(quit_now){
807
errno = EINTR;
808
goto mandos_end;
809
}
810
611
}
811
612
812
613
if(debug){
813
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
814
}
815
816
if(quit_now){
817
errno = EINTR;
818
goto mandos_end;
819
}
820
821
/* Spurious warning from -Wint-to-pointer-cast */
614
fprintf(stderr, "Establishing TLS session with %s\n", ip);
615
}
616
822
617
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
823
618
824
if(quit_now){
825
errno = EINTR;
826
goto mandos_end;
827
}
828
829
do {
619
do{
830
620
ret = gnutls_handshake(session);
831
if(quit_now){
832
errno = EINTR;
833
goto mandos_end;
834
}
835
621
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
836
622
837
623
if(ret != GNUTLS_E_SUCCESS){
838
624
if(debug){
839
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
625
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
840
626
gnutls_perror(ret);
841
627
}
842
errno = EPROTO;
628
retval = -1;
843
629
goto mandos_end;
844
630
}
845
631
846
632
/* Read OpenPGP packet that contains the wanted password */
847
633
848
634
if(debug){
849
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
850
" %s\n", ip);
635
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
636
ip);
851
637
}
852
638
853
639
while(true){
854
855
if(quit_now){
856
errno = EINTR;
857
goto mandos_end;
858
}
859
860
buffer_capacity = incbuffer(&buffer, buffer_length,
861
buffer_capacity);
640
buffer_capacity = adjustbuffer(&buffer, buffer_length,
641
buffer_capacity);
862
642
if(buffer_capacity == 0){
863
int e = errno;
864
perror_plus("incbuffer");
865
errno = e;
866
goto mandos_end;
867
}
868
869
if(quit_now){
870
errno = EINTR;
643
perror("adjustbuffer");
644
retval = -1;
871
645
goto mandos_end;
872
646
}
873
647
882
656
case GNUTLS_E_AGAIN:
883
657
break;
884
658
case GNUTLS_E_REHANDSHAKE:
885
do {
659
do{
886
660
ret = gnutls_handshake(session);
887
888
if(quit_now){
889
errno = EINTR;
890
goto mandos_end;
891
}
892
661
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
893
662
if(ret < 0){
894
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
895
"***\n");
663
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
896
664
gnutls_perror(ret);
897
errno = EPROTO;
665
retval = -1;
898
666
goto mandos_end;
899
667
}
900
668
break;
901
669
default:
902
fprintf_plus(stderr, "Unknown error while reading data from"
903
" encrypted session with Mandos server\n");
670
fprintf(stderr, "Unknown error while reading data from"
671
" encrypted session with Mandos server\n");
672
retval = -1;
904
673
gnutls_bye(session, GNUTLS_SHUT_RDWR);
905
errno = EIO;
906
674
goto mandos_end;
907
675
}
908
676
} else {
911
679
}
912
680
913
681
if(debug){
914
fprintf_plus(stderr, "Closing TLS session\n");
915
}
916
917
if(quit_now){
918
errno = EINTR;
919
goto mandos_end;
920
}
921
922
do {
923
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
924
if(quit_now){
925
errno = EINTR;
926
goto mandos_end;
927
}
928
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
682
fprintf(stderr, "Closing TLS session\n");
683
}
684
685
gnutls_bye(session, GNUTLS_SHUT_RDWR);
929
686
930
687
if(buffer_length > 0){
931
ssize_t decrypted_buffer_size;
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
688
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
689
buffer_length,
933
690
&decrypted_buffer);
934
691
if(decrypted_buffer_size >= 0){
935
936
692
written = 0;
937
693
while(written < (size_t) decrypted_buffer_size){
938
if(quit_now){
939
errno = EINTR;
940
goto mandos_end;
941
}
942
943
694
ret = (int)fwrite(decrypted_buffer + written, 1,
944
695
(size_t)decrypted_buffer_size - written,
945
696
stdout);
946
697
if(ret == 0 and ferror(stdout)){
947
int e = errno;
948
698
if(debug){
949
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
950
strerror(errno));
699
fprintf(stderr, "Error writing encrypted data: %s\n",
700
strerror(errno));
951
701
}
952
errno = e;
953
goto mandos_end;
702
retval = -1;
703
break;
954
704
}
955
705
written += (size_t)ret;
956
706
}
957
retval = 0;
707
free(decrypted_buffer);
708
} else {
709
retval = -1;
958
710
}
711
} else {
712
retval = -1;
959
713
}
960
714
961
715
/* Shutdown procedure */
962
716
963
717
mandos_end:
964
{
965
int e = errno;
966
free(decrypted_buffer);
967
free(buffer);
968
if(tcp_sd >= 0){
969
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
970
}
971
if(ret == -1){
972
if(e == 0){
973
e = errno;
974
}
975
perror_plus("close");
976
}
977
gnutls_deinit(session);
978
errno = e;
979
if(quit_now){
980
errno = EINTR;
981
retval = -1;
982
}
718
free(buffer);
719
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
720
if(ret == -1){
721
perror("close");
983
722
}
723
gnutls_deinit(session);
984
724
return retval;
985
725
}
986
726
987
727
static void resolve_callback(AvahiSServiceResolver *r,
988
728
AvahiIfIndex interface,
989
AvahiProtocol proto,
729
AVAHI_GCC_UNUSED AvahiProtocol protocol,
990
730
AvahiResolverEvent event,
991
731
const char *name,
992
732
const char *type,
997
737
AVAHI_GCC_UNUSED AvahiStringList *txt,
998
738
AVAHI_GCC_UNUSED AvahiLookupResultFlags
999
739
flags,
1000
AVAHI_GCC_UNUSED void* userdata){
740
void* userdata){
741
mandos_context *mc = userdata;
1001
742
assert(r);
1002
743
1003
744
/* Called whenever a service has been resolved successfully or
1004
745
timed out */
1005
746
1006
if(quit_now){
1007
return;
1008
}
1009
1010
747
switch(event){
1011
748
default:
1012
749
case AVAHI_RESOLVER_FAILURE:
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1015
domain,
1016
avahi_strerror(avahi_server_errno(mc.server)));
750
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
751
" of type '%s' in domain '%s': %s\n", name, type, domain,
752
avahi_strerror(avahi_server_errno(mc->server)));
1017
753
break;
1018
754
1019
755
case AVAHI_RESOLVER_FOUND:
1021
757
char ip[AVAHI_ADDRESS_STR_MAX];
1022
758
avahi_address_snprint(ip, sizeof(ip), address);
1023
759
if(debug){
1024
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
host_name, ip, (intmax_t)interface, port);
760
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
761
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
762
ip, (intmax_t)interface, port);
1027
763
}
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
764
int ret = start_mandos_communication(ip, port, interface, mc);
1030
765
if(ret == 0){
1031
avahi_simple_poll_quit(mc.simple_poll);
1032
} else {
1033
if(not add_server(ip, port, interface,
1034
avahi_proto_to_af(proto))){
1035
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1036
" list\n", name);
1037
}
766
avahi_simple_poll_quit(mc->simple_poll);
1038
767
}
1039
768
}
1040
769
}
1050
779
const char *domain,
1051
780
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1052
781
flags,
1053
AVAHI_GCC_UNUSED void* userdata){
782
void* userdata){
783
mandos_context *mc = userdata;
1054
784
assert(b);
1055
785
1056
786
/* Called whenever a new services becomes available on the LAN or
1057
787
is removed from the LAN */
1058
788
1059
if(quit_now){
1060
return;
1061
}
1062
1063
789
switch(event){
1064
790
default:
1065
791
case AVAHI_BROWSER_FAILURE:
1066
792
1067
fprintf_plus(stderr, "(Avahi browser) %s\n",
1068
avahi_strerror(avahi_server_errno(mc.server)));
1069
avahi_simple_poll_quit(mc.simple_poll);
793
fprintf(stderr, "(Avahi browser) %s\n",
794
avahi_strerror(avahi_server_errno(mc->server)));
795
avahi_simple_poll_quit(mc->simple_poll);
1070
796
return;
1071
797
1072
798
case AVAHI_BROWSER_NEW:
1075
801
the callback function is called the Avahi server will free the
1076
802
resolver for us. */
1077
803
1078
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1079
name, type, domain, protocol, 0,
1080
resolve_callback, NULL) == NULL)
1081
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1082
" %s\n", name,
1083
avahi_strerror(avahi_server_errno(mc.server)));
804
if(!(avahi_s_service_resolver_new(mc->server, interface,
805
protocol, name, type, domain,
806
AVAHI_PROTO_INET6, 0,
807
resolve_callback, mc)))
808
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
809
name, avahi_strerror(avahi_server_errno(mc->server)));
1084
810
break;
1085
811
1086
812
case AVAHI_BROWSER_REMOVE:
1089
815
case AVAHI_BROWSER_ALL_FOR_NOW:
1090
816
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1091
817
if(debug){
1092
fprintf_plus(stderr, "No Mandos server found, still"
1093
" searching...\n");
818
fprintf(stderr, "No Mandos server found, still searching...\n");
1094
819
}
1095
820
break;
1096
821
}
1097
822
}
1098
823
1099
/* Signal handler that stops main loop after SIGTERM */
1100
static void handle_sigterm(int sig){
1101
if(quit_now){
1102
return;
1103
}
1104
quit_now = 1;
1105
signal_received = sig;
1106
int old_errno = errno;
1107
/* set main loop to exit */
1108
if(mc.simple_poll != NULL){
1109
avahi_simple_poll_quit(mc.simple_poll);
1110
}
1111
errno = old_errno;
1112
}
1113
1114
bool get_flags(const char *ifname, struct ifreq *ifr){
1115
int ret;
1116
1117
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1118
if(s < 0){
1119
perror_plus("socket");
1120
return false;
1121
}
1122
strcpy(ifr->ifr_name, ifname);
1123
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1124
if(ret == -1){
1125
if(debug){
1126
perror_plus("ioctl SIOCGIFFLAGS");
1127
}
1128
return false;
1129
}
1130
return true;
1131
}
1132
1133
bool good_flags(const char *ifname, const struct ifreq *ifr){
1134
1135
/* Reject the loopback device */
1136
if(ifr->ifr_flags & IFF_LOOPBACK){
1137
if(debug){
1138
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1139
ifname);
1140
}
1141
return false;
1142
}
1143
/* Accept point-to-point devices only if connect_to is specified */
1144
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1145
if(debug){
1146
fprintf_plus(stderr, "Accepting point-to-point interface"
1147
" \"%s\"\n", ifname);
1148
}
1149
return true;
1150
}
1151
/* Otherwise, reject non-broadcast-capable devices */
1152
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1153
if(debug){
1154
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1155
" \"%s\"\n", ifname);
1156
}
1157
return false;
1158
}
1159
/* Reject non-ARP interfaces (including dummy interfaces) */
1160
if(ifr->ifr_flags & IFF_NOARP){
1161
if(debug){
1162
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1163
ifname);
1164
}
1165
return false;
1166
}
1167
1168
/* Accept this device */
1169
if(debug){
1170
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1171
}
1172
return true;
1173
}
1174
1175
/*
1176
* This function determines if a directory entry in /sys/class/net
1177
* corresponds to an acceptable network device.
1178
* (This function is passed to scandir(3) as a filter function.)
1179
*/
1180
int good_interface(const struct dirent *if_entry){
1181
if(if_entry->d_name[0] == '.'){
1182
return 0;
1183
}
1184
1185
struct ifreq ifr;
1186
if(not get_flags(if_entry->d_name, &ifr)){
1187
if(debug){
1188
fprintf_plus(stderr, "Failed to get flags for interface "
1189
"\"%s\"\n", if_entry->d_name);
1190
}
1191
return 0;
1192
}
1193
1194
if(not good_flags(if_entry->d_name, &ifr)){
1195
return 0;
1196
}
1197
return 1;
1198
}
1199
1200
/*
1201
* This function determines if a directory entry in /sys/class/net
1202
* corresponds to an acceptable network device which is up.
1203
* (This function is passed to scandir(3) as a filter function.)
1204
*/
1205
int up_interface(const struct dirent *if_entry){
1206
if(if_entry->d_name[0] == '.'){
1207
return 0;
1208
}
1209
1210
struct ifreq ifr;
1211
if(not get_flags(if_entry->d_name, &ifr)){
1212
if(debug){
1213
fprintf_plus(stderr, "Failed to get flags for interface "
1214
"\"%s\"\n", if_entry->d_name);
1215
}
1216
return 0;
1217
}
1218
1219
/* Reject down interfaces */
1220
if(not (ifr.ifr_flags & IFF_UP)){
1221
if(debug){
1222
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1223
if_entry->d_name);
1224
}
1225
return 0;
1226
}
1227
1228
/* Reject non-running interfaces */
1229
if(not (ifr.ifr_flags & IFF_RUNNING)){
1230
if(debug){
1231
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1232
if_entry->d_name);
1233
}
1234
return 0;
1235
}
1236
1237
if(not good_flags(if_entry->d_name, &ifr)){
1238
return 0;
1239
}
1240
return 1;
1241
}
1242
1243
int notdotentries(const struct dirent *direntry){
1244
/* Skip "." and ".." */
1245
if(direntry->d_name[0] == '.'
1246
and (direntry->d_name[1] == '\0'
1247
or (direntry->d_name[1] == '.'
1248
and direntry->d_name[2] == '\0'))){
1249
return 0;
1250
}
1251
return 1;
1252
}
1253
1254
/* Is this directory entry a runnable program? */
1255
int runnable_hook(const struct dirent *direntry){
1256
int ret;
1257
size_t sret;
1258
struct stat st;
1259
1260
if((direntry->d_name)[0] == '\0'){
1261
/* Empty name? */
1262
return 0;
1263
}
1264
1265
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1266
"abcdefghijklmnopqrstuvwxyz"
1267
"0123456789"
1268
"_-");
1269
if((direntry->d_name)[sret] != '\0'){
1270
/* Contains non-allowed characters */
1271
if(debug){
1272
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1273
direntry->d_name);
1274
}
1275
return 0;
1276
}
1277
1278
char *fullname = NULL;
1279
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1280
if(ret < 0){
1281
perror_plus("asprintf");
1282
return 0;
1283
}
1284
1285
ret = stat(fullname, &st);
1286
if(ret == -1){
1287
if(debug){
1288
perror_plus("Could not stat hook");
1289
}
1290
return 0;
1291
}
1292
if(not (S_ISREG(st.st_mode))){
1293
/* Not a regular file */
1294
if(debug){
1295
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1296
direntry->d_name);
1297
}
1298
return 0;
1299
}
1300
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1301
/* Not executable */
1302
if(debug){
1303
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1304
direntry->d_name);
1305
}
1306
return 0;
1307
}
1308
if(debug){
1309
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1310
direntry->d_name);
1311
}
1312
return 1;
1313
}
1314
1315
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1316
int ret;
1317
struct timespec now;
1318
struct timespec waited_time;
1319
intmax_t block_time;
1320
1321
while(true){
1322
if(mc.current_server == NULL){
1323
if (debug){
1324
fprintf_plus(stderr, "Wait until first server is found."
1325
" No timeout!\n");
1326
}
1327
ret = avahi_simple_poll_iterate(s, -1);
1328
} else {
1329
if (debug){
1330
fprintf_plus(stderr, "Check current_server if we should run"
1331
" it, or wait\n");
1332
}
1333
/* the current time */
1334
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1335
if(ret == -1){
1336
perror_plus("clock_gettime");
1337
return -1;
1338
}
1339
/* Calculating in ms how long time between now and server
1340
who we visted longest time ago. Now - last seen. */
1341
waited_time.tv_sec = (now.tv_sec
1342
- mc.current_server->last_seen.tv_sec);
1343
waited_time.tv_nsec = (now.tv_nsec
1344
- mc.current_server->last_seen.tv_nsec);
1345
/* total time is 10s/10,000ms.
1346
Converting to s from ms by dividing by 1,000,
1347
and ns to ms by dividing by 1,000,000. */
1348
block_time = ((retry_interval
1349
- ((intmax_t)waited_time.tv_sec * 1000))
1350
- ((intmax_t)waited_time.tv_nsec / 1000000));
1351
1352
if (debug){
1353
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1354
block_time);
1355
}
1356
1357
if(block_time <= 0){
1358
ret = start_mandos_communication(mc.current_server->ip,
1359
mc.current_server->port,
1360
mc.current_server->if_index,
1361
mc.current_server->af);
1362
if(ret == 0){
1363
avahi_simple_poll_quit(mc.simple_poll);
1364
return 0;
1365
}
1366
ret = clock_gettime(CLOCK_MONOTONIC,
1367
&mc.current_server->last_seen);
1368
if(ret == -1){
1369
perror_plus("clock_gettime");
1370
return -1;
1371
}
1372
mc.current_server = mc.current_server->next;
1373
block_time = 0; /* Call avahi to find new Mandos
1374
servers, but don't block */
1375
}
1376
1377
ret = avahi_simple_poll_iterate(s, (int)block_time);
1378
}
1379
if(ret != 0){
1380
if (ret > 0 or errno != EINTR){
1381
return (ret != 1) ? ret : 0;
1382
}
1383
}
1384
}
1385
}
1386
1387
bool run_network_hooks(const char *mode, const char *interface,
1388
const float delay){
1389
struct dirent **direntries;
1390
struct dirent *direntry;
1391
int ret;
1392
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1393
alphasort);
1394
if(numhooks == -1){
1395
perror_plus("scandir");
1396
} else {
1397
int devnull = open("/dev/null", O_RDONLY);
1398
for(int i = 0; i < numhooks; i++){
1399
direntry = direntries[i];
1400
char *fullname = NULL;
1401
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1402
if(ret < 0){
1403
perror_plus("asprintf");
1404
continue;
1405
}
1406
if(debug){
1407
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1408
direntry->d_name);
1409
}
1410
pid_t hook_pid = fork();
1411
if(hook_pid == 0){
1412
/* Child */
1413
/* Raise privileges */
1414
errno = 0;
1415
ret = seteuid(0);
1416
if(ret == -1){
1417
perror_plus("seteuid");
1418
}
1419
/* Raise privileges even more */
1420
errno = 0;
1421
ret = setuid(0);
1422
if(ret == -1){
1423
perror_plus("setuid");
1424
}
1425
/* Set group */
1426
errno = 0;
1427
ret = setgid(0);
1428
if(ret == -1){
1429
perror_plus("setgid");
1430
}
1431
/* Reset supplementary groups */
1432
errno = 0;
1433
ret = setgroups(0, NULL);
1434
if(ret == -1){
1435
perror_plus("setgroups");
1436
}
1437
dup2(devnull, STDIN_FILENO);
1438
close(devnull);
1439
dup2(STDERR_FILENO, STDOUT_FILENO);
1440
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1441
if(ret == -1){
1442
perror_plus("setenv");
1443
_exit(EX_OSERR);
1444
}
1445
ret = setenv("DEVICE", interface, 1);
1446
if(ret == -1){
1447
perror_plus("setenv");
1448
_exit(EX_OSERR);
1449
}
1450
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1451
if(ret == -1){
1452
perror_plus("setenv");
1453
_exit(EX_OSERR);
1454
}
1455
ret = setenv("MODE", mode, 1);
1456
if(ret == -1){
1457
perror_plus("setenv");
1458
_exit(EX_OSERR);
1459
}
1460
char *delaystring;
1461
ret = asprintf(&delaystring, "%f", delay);
1462
if(ret == -1){
1463
perror_plus("asprintf");
1464
_exit(EX_OSERR);
1465
}
1466
ret = setenv("DELAY", delaystring, 1);
1467
if(ret == -1){
1468
free(delaystring);
1469
perror_plus("setenv");
1470
_exit(EX_OSERR);
1471
}
1472
free(delaystring);
1473
ret = execl(fullname, direntry->d_name, mode, NULL);
1474
perror_plus("execl");
1475
} else {
1476
int status;
1477
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1478
perror_plus("waitpid");
1479
free(fullname);
1480
continue;
1481
}
1482
if(WIFEXITED(status)){
1483
if(WEXITSTATUS(status) != 0){
1484
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1485
" with status %d\n", direntry->d_name,
1486
WEXITSTATUS(status));
1487
free(fullname);
1488
continue;
1489
}
1490
} else if(WIFSIGNALED(status)){
1491
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1492
" signal %d\n", direntry->d_name,
1493
WTERMSIG(status));
1494
free(fullname);
1495
continue;
1496
} else {
1497
fprintf_plus(stderr, "Warning: network hook \"%s\""
1498
" crashed\n", direntry->d_name);
1499
free(fullname);
1500
continue;
1501
}
1502
}
1503
free(fullname);
1504
if(debug){
1505
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1506
direntry->d_name);
1507
}
1508
}
1509
close(devnull);
1510
}
1511
return true;
1512
}
1513
1514
824
int main(int argc, char *argv[]){
1515
825
AvahiSServiceBrowser *sb = NULL;
1516
826
int error;
1517
827
int ret;
1518
828
intmax_t tmpmax;
1519
char *tmp;
829
int numchars;
1520
830
int exitcode = EXIT_SUCCESS;
1521
const char *interface = "";
831
const char *interface = "eth0";
1522
832
struct ifreq network;
1523
int sd = -1;
1524
bool take_down_interface = false;
833
int sd;
1525
834
uid_t uid;
1526
835
gid_t gid;
836
char *connect_to = NULL;
1527
837
char tempdir[] = "/tmp/mandosXXXXXX";
1528
838
bool tempdir_created = false;
1529
839
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1530
840
const char *seckey = PATHDIR "/" SECKEY;
1531
841
const char *pubkey = PATHDIR "/" PUBKEY;
1532
842
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1533
846
bool gnutls_initialized = false;
1534
847
bool gpgme_initialized = false;
1535
float delay = 2.5f;
1536
double retry_interval = 10; /* 10s between trying a server and
1537
retrying the same server again */
1538
1539
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1540
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1541
1542
uid = getuid();
1543
gid = getgid();
1544
1545
/* Lower any group privileges we might have, just to be safe */
1546
errno = 0;
1547
ret = setgid(gid);
1548
if(ret == -1){
1549
perror_plus("setgid");
1550
}
1551
1552
/* Lower user privileges (temporarily) */
1553
errno = 0;
1554
ret = seteuid(uid);
1555
if(ret == -1){
1556
perror_plus("seteuid");
1557
}
1558
1559
if(quit_now){
1560
goto end;
1561
}
848
double delay = 2.5;
1562
849
1563
850
{
1564
851
struct argp_option options[] = {
1570
857
.group = 1 },
1571
858
{ .name = "interface", .key = 'i',
1572
859
.arg = "NAME",
1573
.doc = "Network interface that will be used to search for"
1574
" Mandos servers",
860
.doc = "Interface that will be used to search for Mandos"
861
" servers",
1575
862
.group = 1 },
1576
863
{ .name = "seckey", .key = 's',
1577
864
.arg = "FILE",
1594
881
.arg = "SECONDS",
1595
882
.doc = "Maximum delay to wait for interface startup",
1596
883
.group = 2 },
1597
{ .name = "retry", .key = 132,
1598
.arg = "SECONDS",
1599
.doc = "Retry interval used when denied by the mandos server",
1600
.group = 2 },
1601
{ .name = "network-hook-dir", .key = 133,
1602
.arg = "DIR",
1603
.doc = "Directory where network hooks are located",
1604
.group = 2 },
1605
/*
1606
* These reproduce what we would get without ARGP_NO_HELP
1607
*/
1608
{ .name = "help", .key = '?',
1609
.doc = "Give this help list", .group = -1 },
1610
{ .name = "usage", .key = -3,
1611
.doc = "Give a short usage message", .group = -1 },
1612
{ .name = "version", .key = 'V',
1613
.doc = "Print program version", .group = -1 },
1614
884
{ .name = NULL }
1615
885
};
1616
886
1617
887
error_t parse_opt(int key, char *arg,
1618
888
struct argp_state *state){
1619
errno = 0;
1620
889
switch(key){
1621
890
case 128: /* --debug */
1622
891
debug = true;
1634
903
pubkey = arg;
1635
904
break;
1636
905
case 129: /* --dh-bits */
1637
errno = 0;
1638
tmpmax = strtoimax(arg, &tmp, 10);
1639
if(errno != 0 or tmp == arg or *tmp != '\0'
1640
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1641
argp_error(state, "Bad number of DH bits");
906
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
907
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
908
or arg[numchars] != '\0'){
909
fprintf(stderr, "Bad number of DH bits\n");
910
exit(EXIT_FAILURE);
1642
911
}
1643
912
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1644
913
break;
1646
915
mc.priority = arg;
1647
916
break;
1648
917
case 131: /* --delay */
1649
errno = 0;
1650
delay = strtof(arg, &tmp);
1651
if(errno != 0 or tmp == arg or *tmp != '\0'){
1652
argp_error(state, "Bad delay");
1653
}
1654
case 132: /* --retry */
1655
errno = 0;
1656
retry_interval = strtod(arg, &tmp);
1657
if(errno != 0 or tmp == arg or *tmp != '\0'
1658
or (retry_interval * 1000) > INT_MAX
1659
or retry_interval < 0){
1660
argp_error(state, "Bad retry interval");
1661
}
1662
break;
1663
case 133: /* --network-hook-dir */
1664
hookdir = arg;
1665
break;
1666
/*
1667
* These reproduce what we would get without ARGP_NO_HELP
1668
*/
1669
case '?': /* --help */
1670
argp_state_help(state, state->out_stream,
1671
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1672
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1673
case -3: /* --usage */
1674
argp_state_help(state, state->out_stream,
1675
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1676
case 'V': /* --version */
1677
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1678
exit(argp_err_exit_status);
918
ret = sscanf(arg, "%lf%n", &delay, &numchars);
919
if(ret < 1 or arg[numchars] != '\0'){
920
fprintf(stderr, "Bad delay\n");
921
exit(EXIT_FAILURE);
922
}
923
break;
924
case ARGP_KEY_ARG:
925
argp_usage(state);
926
case ARGP_KEY_END:
1679
927
break;
1680
928
default:
1681
929
return ARGP_ERR_UNKNOWN;
1682
930
}
1683
return errno;
931
return 0;
1684
932
}
1685
933
1686
934
struct argp argp = { .options = options, .parser = parse_opt,
1687
935
.args_doc = "",
1688
936
.doc = "Mandos client -- Get and decrypt"
1689
937
" passwords from a Mandos server" };
1690
ret = argp_parse(&argp, argc, argv,
1691
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1692
switch(ret){
1693
case 0:
1694
break;
1695
case ENOMEM:
1696
default:
1697
errno = ret;
1698
perror_plus("argp_parse");
1699
exitcode = EX_OSERR;
1700
goto end;
1701
case EINVAL:
1702
exitcode = EX_USAGE;
1703
goto end;
1704
}
1705
}
1706
1707
{
1708
/* Work around Debian bug #633582:
1709
<http://bugs.debian.org/633582> */
1710
1711
/* Re-raise priviliges */
1712
errno = 0;
1713
ret = seteuid(0);
1714
if(ret == -1){
1715
perror_plus("seteuid");
1716
} else {
1717
struct stat st;
1718
1719
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1720
int seckey_fd = open(seckey, O_RDONLY);
1721
if(seckey_fd == -1){
1722
perror_plus("open");
1723
} else {
1724
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1725
if(ret == -1){
1726
perror_plus("fstat");
1727
} else {
1728
if(S_ISREG(st.st_mode)
1729
and st.st_uid == 0 and st.st_gid == 0){
1730
ret = fchown(seckey_fd, uid, gid);
1731
if(ret == -1){
1732
perror_plus("fchown");
1733
}
1734
}
1735
}
1736
TEMP_FAILURE_RETRY(close(seckey_fd));
1737
}
1738
}
1739
1740
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1741
int pubkey_fd = open(pubkey, O_RDONLY);
1742
if(pubkey_fd == -1){
1743
perror_plus("open");
1744
} else {
1745
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1746
if(ret == -1){
1747
perror_plus("fstat");
1748
} else {
1749
if(S_ISREG(st.st_mode)
1750
and st.st_uid == 0 and st.st_gid == 0){
1751
ret = fchown(pubkey_fd, uid, gid);
1752
if(ret == -1){
1753
perror_plus("fchown");
1754
}
1755
}
1756
}
1757
TEMP_FAILURE_RETRY(close(pubkey_fd));
1758
}
1759
}
1760
1761
/* Lower privileges */
1762
errno = 0;
1763
ret = seteuid(uid);
1764
if(ret == -1){
1765
perror_plus("seteuid");
1766
}
1767
}
1768
}
1769
1770
/* Run network hooks */
1771
if(not run_network_hooks("start", interface, delay)){
1772
goto end;
1773
}
1774
1775
if(not debug){
1776
avahi_set_log_function(empty_log);
1777
}
1778
1779
if(interface[0] == '\0'){
1780
struct dirent **direntries;
1781
/* First look for interfaces that are up */
1782
ret = scandir(sys_class_net, &direntries, up_interface,
1783
alphasort);
1784
if(ret == 0){
1785
/* No up interfaces, look for any good interfaces */
1786
free(direntries);
1787
ret = scandir(sys_class_net, &direntries, good_interface,
1788
alphasort);
1789
}
1790
if(ret >= 1){
1791
/* Pick the first interface returned */
1792
interface = strdup(direntries[0]->d_name);
1793
if(debug){
1794
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1795
}
1796
if(interface == NULL){
1797
perror_plus("malloc");
1798
free(direntries);
1799
exitcode = EXIT_FAILURE;
1800
goto end;
1801
}
1802
free(direntries);
1803
} else {
1804
free(direntries);
1805
fprintf_plus(stderr, "Could not find a network interface\n");
938
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
939
if(ret == ARGP_ERR_UNKNOWN){
940
fprintf(stderr, "Unknown error while parsing arguments\n");
1806
941
exitcode = EXIT_FAILURE;
1807
942
goto end;
1808
943
}
1809
944
}
1810
945
1811
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1812
from the signal handler */
1813
/* Initialize the pseudo-RNG for Avahi */
1814
srand((unsigned int) time(NULL));
1815
mc.simple_poll = avahi_simple_poll_new();
1816
if(mc.simple_poll == NULL){
1817
fprintf_plus(stderr,
1818
"Avahi: Failed to create simple poll object.\n");
1819
exitcode = EX_UNAVAILABLE;
1820
goto end;
1821
}
1822
1823
sigemptyset(&sigterm_action.sa_mask);
1824
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1825
if(ret == -1){
1826
perror_plus("sigaddset");
1827
exitcode = EX_OSERR;
1828
goto end;
1829
}
1830
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1831
if(ret == -1){
1832
perror_plus("sigaddset");
1833
exitcode = EX_OSERR;
1834
goto end;
1835
}
1836
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1837
if(ret == -1){
1838
perror_plus("sigaddset");
1839
exitcode = EX_OSERR;
1840
goto end;
1841
}
1842
/* Need to check if the handler is SIG_IGN before handling:
1843
| [[info:libc:Initial Signal Actions]] |
1844
| [[info:libc:Basic Signal Handling]] |
1845
*/
1846
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1847
if(ret == -1){
1848
perror_plus("sigaction");
1849
return EX_OSERR;
1850
}
1851
if(old_sigterm_action.sa_handler != SIG_IGN){
1852
ret = sigaction(SIGINT, &sigterm_action, NULL);
1853
if(ret == -1){
1854
perror_plus("sigaction");
1855
exitcode = EX_OSERR;
1856
goto end;
1857
}
1858
}
1859
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1860
if(ret == -1){
1861
perror_plus("sigaction");
1862
return EX_OSERR;
1863
}
1864
if(old_sigterm_action.sa_handler != SIG_IGN){
1865
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1866
if(ret == -1){
1867
perror_plus("sigaction");
1868
exitcode = EX_OSERR;
1869
goto end;
1870
}
1871
}
1872
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1873
if(ret == -1){
1874
perror_plus("sigaction");
1875
return EX_OSERR;
1876
}
1877
if(old_sigterm_action.sa_handler != SIG_IGN){
1878
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1879
if(ret == -1){
1880
perror_plus("sigaction");
1881
exitcode = EX_OSERR;
1882
goto end;
1883
}
1884
}
1885
1886
946
/* If the interface is down, bring it up */
1887
if(strcmp(interface, "none") != 0){
1888
if_index = (AvahiIfIndex) if_nametoindex(interface);
1889
if(if_index == 0){
1890
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1891
exitcode = EX_UNAVAILABLE;
1892
goto end;
1893
}
1894
1895
if(quit_now){
1896
goto end;
1897
}
1898
1899
/* Re-raise priviliges */
1900
errno = 0;
1901
ret = seteuid(0);
1902
if(ret == -1){
1903
perror_plus("seteuid");
1904
}
1905
947
{
1906
948
#ifdef __linux__
1907
949
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1908
messages about the network interface to mess up the prompt */
950
messages to mess up the prompt */
1909
951
ret = klogctl(8, NULL, 5);
1910
bool restore_loglevel = true;
1911
952
if(ret == -1){
1912
restore_loglevel = false;
1913
perror_plus("klogctl");
953
perror("klogctl");
1914
954
}
1915
#endif /* __linux__ */
955
#endif
1916
956
1917
957
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1918
958
if(sd < 0){
1919
perror_plus("socket");
1920
exitcode = EX_OSERR;
959
perror("socket");
960
exitcode = EXIT_FAILURE;
1921
961
#ifdef __linux__
1922
if(restore_loglevel){
1923
ret = klogctl(7, NULL, 0);
1924
if(ret == -1){
1925
perror_plus("klogctl");
1926
}
1927
}
1928
#endif /* __linux__ */
1929
/* Lower privileges */
1930
errno = 0;
1931
ret = seteuid(uid);
962
ret = klogctl(7, NULL, 0);
1932
963
if(ret == -1){
1933
perror_plus("seteuid");
964
perror("klogctl");
1934
965
}
966
#endif
1935
967
goto end;
1936
968
}
1937
969
strcpy(network.ifr_name, interface);
1938
970
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1939
971
if(ret == -1){
1940
perror_plus("ioctl SIOCGIFFLAGS");
972
perror("ioctl SIOCGIFFLAGS");
1941
973
#ifdef __linux__
1942
if(restore_loglevel){
1943
ret = klogctl(7, NULL, 0);
1944
if(ret == -1){
1945
perror_plus("klogctl");
1946
}
1947
}
1948
#endif /* __linux__ */
1949
exitcode = EX_OSERR;
1950
/* Lower privileges */
1951
errno = 0;
1952
ret = seteuid(uid);
974
ret = klogctl(7, NULL, 0);
1953
975
if(ret == -1){
1954
perror_plus("seteuid");
976
perror("klogctl");
1955
977
}
978
#endif
979
exitcode = EXIT_FAILURE;
1956
980
goto end;
1957
981
}
1958
982
if((network.ifr_flags & IFF_UP) == 0){
1959
983
network.ifr_flags |= IFF_UP;
1960
take_down_interface = true;
1961
984
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1962
985
if(ret == -1){
1963
take_down_interface = false;
1964
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1965
exitcode = EX_OSERR;
986
perror("ioctl SIOCSIFFLAGS");
987
exitcode = EXIT_FAILURE;
1966
988
#ifdef __linux__
1967
if(restore_loglevel){
1968
ret = klogctl(7, NULL, 0);
1969
if(ret == -1){
1970
perror_plus("klogctl");
1971
}
1972
}
1973
#endif /* __linux__ */
1974
/* Lower privileges */
1975
errno = 0;
1976
ret = seteuid(uid);
989
ret = klogctl(7, NULL, 0);
1977
990
if(ret == -1){
1978
perror_plus("seteuid");
991
perror("klogctl");
1979
992
}
993
#endif
1980
994
goto end;
1981
995
}
1982
996
}
1983
/* Sleep checking until interface is running.
1984
Check every 0.25s, up to total time of delay */
997
/* sleep checking until interface is running */
1985
998
for(int i=0; i < delay * 4; i++){
1986
999
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1987
1000
if(ret == -1){
1988
perror_plus("ioctl SIOCGIFFLAGS");
1001
perror("ioctl SIOCGIFFLAGS");
1989
1002
} else if(network.ifr_flags & IFF_RUNNING){
1990
1003
break;
1991
1004
}
1992
1005
struct timespec sleeptime = { .tv_nsec = 250000000 };
1993
1006
ret = nanosleep(&sleeptime, NULL);
1994
1007
if(ret == -1 and errno != EINTR){
1995
perror_plus("nanosleep");
1008
perror("nanosleep");
1996
1009
}
1997
1010
}
1998
if(not take_down_interface){
1999
/* We won't need the socket anymore */
2000
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2001
if(ret == -1){
2002
perror_plus("close");
2003
}
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1012
if(ret == -1){
1013
perror("close");
2004
1014
}
2005
1015
#ifdef __linux__
2006
if(restore_loglevel){
2007
/* Restores kernel loglevel to default */
2008
ret = klogctl(7, NULL, 0);
2009
if(ret == -1){
2010
perror_plus("klogctl");
2011
}
2012
}
2013
#endif /* __linux__ */
2014
/* Lower privileges */
2015
errno = 0;
2016
/* Lower privileges */
2017
ret = seteuid(uid);
1016
/* Restores kernel loglevel to default */
1017
ret = klogctl(7, NULL, 0);
2018
1018
if(ret == -1){
2019
perror_plus("seteuid");
1019
perror("klogctl");
2020
1020
}
2021
}
2022
2023
if(quit_now){
2024
goto end;
2025
}
2026
2027
ret = init_gnutls_global(pubkey, seckey);
2028
if(ret == -1){
2029
fprintf_plus(stderr, "init_gnutls_global failed\n");
2030
exitcode = EX_UNAVAILABLE;
1021
#endif
1022
}
1023
1024
uid = getuid();
1025
gid = getgid();
1026
1027
setgid(gid);
1028
if(ret == -1){
1029
perror("setgid");
1030
}
1031
1032
ret = setuid(uid);
1033
if(ret == -1){
1034
perror("setuid");
1035
}
1036
1037
ret = init_gnutls_global(&mc, pubkey, seckey);
1038
if(ret == -1){
1039
fprintf(stderr, "init_gnutls_global failed\n");
1040
exitcode = EXIT_FAILURE;
2031
1041
goto end;
2032
1042
} else {
2033
1043
gnutls_initialized = true;
2034
1044
}
2035
1045
2036
if(quit_now){
2037
goto end;
2038
}
2039
2040
1046
if(mkdtemp(tempdir) == NULL){
2041
perror_plus("mkdtemp");
1047
perror("mkdtemp");
2042
1048
goto end;
2043
1049
}
2044
1050
tempdir_created = true;
2045
1051
2046
if(quit_now){
2047
goto end;
2048
}
2049
2050
if(not init_gpgme(pubkey, seckey, tempdir)){
2051
fprintf_plus(stderr, "init_gpgme failed\n");
2052
exitcode = EX_UNAVAILABLE;
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1053
fprintf(stderr, "init_gpgme failed\n");
1054
exitcode = EXIT_FAILURE;
2053
1055
goto end;
2054
1056
} else {
2055
1057
gpgme_initialized = true;
2056
1058
}
2057
1059
2058
if(quit_now){
1060
if_index = (AvahiIfIndex) if_nametoindex(interface);
1061
if(if_index == 0){
1062
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1063
exitcode = EXIT_FAILURE;
2059
1064
goto end;
2060
1065
}
2061
1066
2064
1069
/* (Mainly meant for debugging) */
2065
1070
char *address = strrchr(connect_to, ':');
2066
1071
if(address == NULL){
2067
fprintf_plus(stderr, "No colon in address\n");
2068
exitcode = EX_USAGE;
2069
goto end;
2070
}
2071
2072
if(quit_now){
2073
goto end;
2074
}
2075
1072
fprintf(stderr, "No colon in address\n");
1073
exitcode = EXIT_FAILURE;
1074
goto end;
1075
}
2076
1076
uint16_t port;
2077
errno = 0;
2078
tmpmax = strtoimax(address+1, &tmp, 10);
2079
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2080
or tmpmax != (uint16_t)tmpmax){
2081
fprintf_plus(stderr, "Bad port number\n");
2082
exitcode = EX_USAGE;
2083
goto end;
2084
}
2085
2086
if(quit_now){
2087
goto end;
2088
}
2089
1077
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1078
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1079
or address[numchars+1] != '\0'){
1080
fprintf(stderr, "Bad port number\n");
1081
exitcode = EXIT_FAILURE;
1082
goto end;
1083
}
2090
1084
port = (uint16_t)tmpmax;
2091
1085
*address = '\0';
2092
/* Colon in address indicates IPv6 */
2093
int af;
2094
if(strchr(connect_to, ':') != NULL){
2095
af = AF_INET6;
2096
/* Accept [] around IPv6 address - see RFC 5952 */
2097
if(connect_to[0] == '[' and address[-1] == ']')
2098
{
2099
connect_to++;
2100
address[-1] = '\0';
2101
}
2102
} else {
2103
af = AF_INET;
2104
}
2105
1086
address = connect_to;
2106
2107
if(quit_now){
2108
goto end;
2109
}
2110
2111
while(not quit_now){
2112
ret = start_mandos_communication(address, port, if_index, af);
2113
if(quit_now or ret == 0){
2114
break;
2115
}
2116
if(debug){
2117
fprintf_plus(stderr, "Retrying in %d seconds\n",
2118
(int)retry_interval);
2119
}
2120
sleep((int)retry_interval);
2121
}
2122
2123
if (not quit_now){
1087
ret = start_mandos_communication(address, port, if_index, &mc);
1088
if(ret < 0){
1089
exitcode = EXIT_FAILURE;
1090
} else {
2124
1091
exitcode = EXIT_SUCCESS;
2125
1092
}
2126
2127
1093
goto end;
2128
1094
}
2129
1095
2130
if(quit_now){
1096
if(not debug){
1097
avahi_set_log_function(empty_log);
1098
}
1099
1100
/* Initialize the pseudo-RNG for Avahi */
1101
srand((unsigned int) time(NULL));
1102
1103
/* Allocate main Avahi loop object */
1104
mc.simple_poll = avahi_simple_poll_new();
1105
if(mc.simple_poll == NULL){
1106
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1107
exitcode = EXIT_FAILURE;
2131
1108
goto end;
2132
1109
}
2133
1110
2151
1128
2152
1129
/* Check if creating the Avahi server object succeeded */
2153
1130
if(mc.server == NULL){
2154
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2155
avahi_strerror(error));
2156
exitcode = EX_UNAVAILABLE;
2157
goto end;
2158
}
2159
2160
if(quit_now){
1131
fprintf(stderr, "Failed to create Avahi server: %s\n",
1132
avahi_strerror(error));
1133
exitcode = EXIT_FAILURE;
2161
1134
goto end;
2162
1135
}
2163
1136
2164
1137
/* Create the Avahi service browser */
2165
1138
sb = avahi_s_service_browser_new(mc.server, if_index,
2166
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2167
NULL, 0, browse_callback, NULL);
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
2168
1141
if(sb == NULL){
2169
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2170
avahi_strerror(avahi_server_errno(mc.server)));
2171
exitcode = EX_UNAVAILABLE;
2172
goto end;
2173
}
2174
2175
if(quit_now){
1142
fprintf(stderr, "Failed to create service browser: %s\n",
1143
avahi_strerror(avahi_server_errno(mc.server)));
1144
exitcode = EXIT_FAILURE;
2176
1145
goto end;
2177
1146
}
2178
1147
2179
1148
/* Run the main loop */
2180
1149
2181
1150
if(debug){
2182
fprintf_plus(stderr, "Starting Avahi loop search\n");
2183
}
2184
2185
ret = avahi_loop_with_timeout(mc.simple_poll,
2186
(int)(retry_interval * 1000));
2187
if(debug){
2188
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2189
(ret == 0) ? "successfully" : "with error");
2190
}
1151
fprintf(stderr, "Starting Avahi loop search\n");
1152
}
1153
1154
avahi_simple_poll_loop(mc.simple_poll);
2191
1155
2192
1156
end:
2193
1157
2194
1158
if(debug){
2195
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1159
fprintf(stderr, "%s exiting\n", argv[0]);
2196
1160
}
2197
1161
2198
1162
/* Cleanup things */
2215
1179
gpgme_release(mc.ctx);
2216
1180
}
2217
1181
2218
/* Cleans up the circular linked list of Mandos servers the client
2219
has seen */
2220
if(mc.current_server != NULL){
2221
mc.current_server->prev->next = NULL;
2222
while(mc.current_server != NULL){
2223
server *next = mc.current_server->next;
2224
free(mc.current_server);
2225
mc.current_server = next;
2226
}
2227
}
2228
2229
/* Run network hooks */
2230
run_network_hooks("stop", interface, delay);
2231
2232
/* Re-raise priviliges */
2233
{
2234
errno = 0;
2235
ret = seteuid(0);
2236
if(ret == -1){
2237
perror_plus("seteuid");
2238
}
2239
2240
/* Take down the network interface */
2241
if(take_down_interface and geteuid() == 0){
2242
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2243
if(ret == -1){
2244
perror_plus("ioctl SIOCGIFFLAGS");
2245
} else if(network.ifr_flags & IFF_UP){
2246
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2247
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2248
if(ret == -1){
2249
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2250
}
2251
}
2252
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2253
if(ret == -1){
2254
perror_plus("close");
2255
}
2256
}
2257
}
2258
/* Lower privileges permanently */
2259
errno = 0;
2260
ret = setuid(uid);
2261
if(ret == -1){
2262
perror_plus("setuid");
2263
}
2264
2265
/* Removes the GPGME temp directory and all files inside */
1182
/* Removes the temp directory used by GPGME */
2266
1183
if(tempdir_created){
2267
struct dirent **direntries = NULL;
2268
struct dirent *direntry = NULL;
2269
int numentries = scandir(tempdir, &direntries, notdotentries,
2270
alphasort);
2271
if (numentries > 0){
2272
for(int i = 0; i < numentries; i++){
2273
direntry = direntries[i];
1184
DIR *d;
1185
struct dirent *direntry;
1186
d = opendir(tempdir);
1187
if(d == NULL){
1188
if(errno != ENOENT){
1189
perror("opendir");
1190
}
1191
} else {
1192
while(true){
1193
direntry = readdir(d);
1194
if(direntry == NULL){
1195
break;
1196
}
1197
/* Skip "." and ".." */
1198
if(direntry->d_name[0] == '.'
1199
and (direntry->d_name[1] == '\0'
1200
or (direntry->d_name[1] == '.'
1201
and direntry->d_name[2] == '\0'))){
1202
continue;
1203
}
2274
1204
char *fullname = NULL;
2275
1205
ret = asprintf(&fullname, "%s/%s", tempdir,
2276
1206
direntry->d_name);
2277
1207
if(ret < 0){
2278
perror_plus("asprintf");
1208
perror("asprintf");
2279
1209
continue;
2280
1210
}
2281
1211
ret = remove(fullname);
2282
1212
if(ret == -1){
2283
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2284
strerror(errno));
1213
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1214
strerror(errno));
2285
1215
}
2286
1216
free(fullname);
2287
1217
}
2288
}
2289
2290
/* need to clean even if 0 because man page doesn't specify */
2291
free(direntries);
2292
if (numentries == -1){
2293
perror_plus("scandir");
1218
closedir(d);
2294
1219
}
2295
1220
ret = rmdir(tempdir);
2296
1221
if(ret == -1 and errno != ENOENT){
2297
perror_plus("rmdir");
2298
}
2299
}
2300
2301
if(quit_now){
2302
sigemptyset(&old_sigterm_action.sa_mask);
2303
old_sigterm_action.sa_handler = SIG_DFL;
2304
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2305
&old_sigterm_action,
2306
NULL));
2307
if(ret == -1){
2308
perror_plus("sigaction");
2309
}
2310
do {
2311
ret = raise(signal_received);
2312
} while(ret != 0 and errno == EINTR);
2313
if(ret != 0){
2314
perror_plus("raise");
2315
abort();
2316
}
2317
TEMP_FAILURE_RETRY(pause());
1222
perror("rmdir");
1223
}
2318
1224
}
2319
1225
2320
1226
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0