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» Revision
237.7.226
(compared to revision 237.2.89)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2014-03-28 22:32:21 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 311.
- Revision ID: teddy@recompile.se-20140328223221-w579qlvlex5if3dn
Fix location and format of signing key file.
* debian/upstream/signing-key.asc: Added.
* debian/upstream-signing-key.pgp: Removed.
* debian/upstream/signing-key.asc: Added.
* debian/upstream-signing-key.pgp: Removed.
- files added:
- DBUS-API
- debian/source
- debian/upstream
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 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@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
58
inet_pton(), connect(),
59
getnameinfo() */
59
60
#include <fcntl.h> /* open() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
64
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
71
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
77
78
#include <iso646.h> /* not, or, and */
78
79
#include <argp.h> /* struct argp_option, error_t, struct
79
80
argp_state, struct argp,
80
81
argp_parse(), ARGP_KEY_ARG,
81
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
83
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
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
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
85
97
86
98
#ifdef __linux__
87
99
#include <sys/klog.h> /* klogctl() */
105
117
init_gnutls_session(),
106
118
GNUTLS_* */
107
119
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
110
122
111
123
/* GPGME */
112
124
#include <gpgme.h> /* All GPGME types, constants and
120
132
#define PATHDIR "/conf/conf.d/mandos"
121
133
#define SECKEY "seckey.txt"
122
134
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
123
136
124
137
bool debug = false;
125
138
static const char mandos_protocol_version[] = "1";
126
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
139
const char * argp_program_version = "mandos-client " VERSION;
140
const char * argp_program_bug_address = "<mandos@recompile.se>";
141
static const char sys_class_net[] = "/sys/class/net";
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
146
147
/* Doubly linked list that need to be circularly linked when used */
148
typedef struct server{
149
const char *ip;
150
in_port_t port;
151
AvahiIfIndex if_index;
152
int af;
153
struct timespec last_seen;
154
struct server *next;
155
struct server *prev;
156
} server;
128
157
129
158
/* Used for passing in values through the Avahi callback functions */
130
159
typedef struct {
131
AvahiSimplePoll *simple_poll;
132
160
AvahiServer *server;
133
161
gnutls_certificate_credentials_t cred;
134
162
unsigned int dh_bits;
135
163
gnutls_dh_params_t dh_params;
136
164
const char *priority;
137
165
gpgme_ctx_t ctx;
166
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
138
169
} mandos_context;
139
170
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
173
174
sig_atomic_t quit_now = 0;
175
int signal_received = 0;
176
177
/* Function to use when printing errors */
178
void perror_plus(const char *print_text){
179
int e = errno;
180
fprintf(stderr, "Mandos plugin %s: ",
181
program_invocation_short_name);
182
errno = e;
183
perror(print_text);
184
}
185
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
187
int fprintf_plus(FILE *stream, const char *format, ...){
188
va_list ap;
189
va_start (ap, format);
190
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
}
144
195
145
196
/*
146
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
198
* bytes. "buffer_capacity" is how much is currently allocated,
148
199
* "buffer_length" is how much is already used.
149
200
*/
201
__attribute__((nonnull, warn_unused_result))
150
202
size_t incbuffer(char **buffer, size_t buffer_length,
151
size_t buffer_capacity){
203
size_t buffer_capacity){
152
204
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
if(new_buf == NULL){
207
int old_errno = errno;
208
free(*buffer);
209
errno = old_errno;
210
*buffer = NULL;
155
211
return 0;
156
212
}
213
*buffer = new_buf;
157
214
buffer_capacity += BUFFER_SIZE;
158
215
}
159
216
return buffer_capacity;
160
217
}
161
218
219
/* Add server to set of servers to retry periodically */
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
223
int ret;
224
server *new_server = malloc(sizeof(server));
225
if(new_server == NULL){
226
perror_plus("malloc");
227
return false;
228
}
229
*new_server = (server){ .ip = strdup(ip),
230
.port = port,
231
.if_index = if_index,
232
.af = af };
233
if(new_server->ip == NULL){
234
perror_plus("strdup");
235
return false;
236
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
242
/* Special case of first server */
243
if(*current_server == NULL){
244
new_server->next = new_server;
245
new_server->prev = new_server;
246
*current_server = new_server;
247
} else {
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
251
new_server->prev->next = new_server;
252
(*current_server)->prev = new_server;
253
}
254
return true;
255
}
256
162
257
/*
163
258
* Initialize GPGME.
164
259
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char * const seckey,
262
const char * const pubkey,
263
const char * const tempdir,
264
mandos_context *mc){
168
265
gpgme_error_t rc;
169
266
gpgme_engine_info_t engine_info;
170
267
171
172
268
/*
173
269
* Helper function to insert pub and seckey to the engine keyring.
174
270
*/
175
bool import_key(const char *filename){
271
bool import_key(const char * const filename){
272
int ret;
176
273
int fd;
177
274
gpgme_data_t pgp_data;
178
275
179
276
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
277
if(fd == -1){
181
perror("open");
278
perror_plus("open");
182
279
return false;
183
280
}
184
281
185
282
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
283
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
189
286
return false;
190
287
}
191
288
192
rc = gpgme_op_import(mc.ctx, pgp_data);
289
rc = gpgme_op_import(mc->ctx, pgp_data);
193
290
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
196
293
return false;
197
294
}
198
295
199
296
ret = (int)TEMP_FAILURE_RETRY(close(fd));
200
297
if(ret == -1){
201
perror("close");
298
perror_plus("close");
202
299
}
203
300
gpgme_data_release(pgp_data);
204
301
return true;
205
302
}
206
303
207
304
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
305
fprintf_plus(stderr, "Initializing GPGME\n");
209
306
}
210
307
211
308
/* Init GPGME */
212
309
gpgme_check_version(NULL);
213
310
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
311
if(rc != GPG_ERR_NO_ERROR){
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
312
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
313
gpgme_strsource(rc), gpgme_strerror(rc));
217
314
return false;
218
315
}
219
316
220
/* Set GPGME home directory for the OpenPGP engine only */
317
/* Set GPGME home directory for the OpenPGP engine only */
221
318
rc = gpgme_get_engine_info(&engine_info);
222
319
if(rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
320
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
321
gpgme_strsource(rc), gpgme_strerror(rc));
225
322
return false;
226
323
}
227
324
while(engine_info != NULL){
233
330
engine_info = engine_info->next;
234
331
}
235
332
if(engine_info == NULL){
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
333
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
334
tempdir);
237
335
return false;
238
336
}
239
337
240
338
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
339
rc = gpgme_new(&(mc->ctx));
242
340
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
341
fprintf_plus(stderr, "Mandos plugin mandos-client: "
342
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
343
gpgme_strerror(rc));
245
344
return false;
246
345
}
247
346
249
348
return false;
250
349
}
251
350
252
return true;
351
return true;
253
352
}
254
353
255
354
/*
256
355
* Decrypt OpenPGP data.
257
356
* Returns -1 on error
258
357
*/
358
__attribute__((nonnull, warn_unused_result))
259
359
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
360
size_t crypto_size,
261
char **plaintext){
361
char **plaintext,
362
mandos_context *mc){
262
363
gpgme_data_t dh_crypto, dh_plain;
263
364
gpgme_error_t rc;
264
365
ssize_t ret;
266
367
ssize_t plaintext_length = 0;
267
368
268
369
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
370
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
270
371
}
271
372
272
373
/* Create new GPGME data buffer from memory cryptotext */
273
374
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
375
0);
275
376
if(rc != GPG_ERR_NO_ERROR){
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
377
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
378
gpgme_strsource(rc), gpgme_strerror(rc));
278
379
return -1;
279
380
}
280
381
281
382
/* Create new empty GPGME data buffer for the plaintext */
282
383
rc = gpgme_data_new(&dh_plain);
283
384
if(rc != GPG_ERR_NO_ERROR){
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
385
fprintf_plus(stderr, "Mandos plugin mandos-client: "
386
"bad gpgme_data_new: %s: %s\n",
387
gpgme_strsource(rc), gpgme_strerror(rc));
286
388
gpgme_data_release(dh_crypto);
287
389
return -1;
288
390
}
289
391
290
392
/* Decrypt data from the cryptotext data buffer to the plaintext
291
393
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
394
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
293
395
if(rc != GPG_ERR_NO_ERROR){
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
396
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
397
gpgme_strsource(rc), gpgme_strerror(rc));
296
398
plaintext_length = -1;
297
399
if(debug){
298
400
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
401
result = gpgme_op_decrypt_result(mc->ctx);
300
402
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
403
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
302
404
} else {
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
405
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
406
result->unsupported_algorithm);
407
fprintf_plus(stderr, "Wrong key usage: %u\n",
408
result->wrong_key_usage);
307
409
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
410
fprintf_plus(stderr, "File name: %s\n", result->file_name);
309
411
}
310
412
gpgme_recipient_t recipient;
311
413
recipient = result->recipients;
312
if(recipient){
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
319
? "No" : "Yes");
320
recipient = recipient->next;
321
}
414
while(recipient != NULL){
415
fprintf_plus(stderr, "Public key algorithm: %s\n",
416
gpgme_pubkey_algo_name
417
(recipient->pubkey_algo));
418
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
419
fprintf_plus(stderr, "Secret key available: %s\n",
420
recipient->status == GPG_ERR_NO_SECKEY
421
? "No" : "Yes");
422
recipient = recipient->next;
322
423
}
323
424
}
324
425
}
326
427
}
327
428
328
429
if(debug){
329
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
430
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
330
431
}
331
432
332
433
/* Seek back to the beginning of the GPGME plaintext data buffer */
333
434
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
334
perror("gpgme_data_seek");
435
perror_plus("gpgme_data_seek");
335
436
plaintext_length = -1;
336
437
goto decrypt_end;
337
438
}
339
440
*plaintext = NULL;
340
441
while(true){
341
442
plaintext_capacity = incbuffer(plaintext,
342
(size_t)plaintext_length,
343
plaintext_capacity);
443
(size_t)plaintext_length,
444
plaintext_capacity);
344
445
if(plaintext_capacity == 0){
345
perror("incbuffer");
346
plaintext_length = -1;
347
goto decrypt_end;
446
perror_plus("incbuffer");
447
plaintext_length = -1;
448
goto decrypt_end;
348
449
}
349
450
350
451
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
355
456
break;
356
457
}
357
458
if(ret < 0){
358
perror("gpgme_data_read");
459
perror_plus("gpgme_data_read");
359
460
plaintext_length = -1;
360
461
goto decrypt_end;
361
462
}
363
464
}
364
465
365
466
if(debug){
366
fprintf(stderr, "Decrypted password is: ");
467
fprintf_plus(stderr, "Decrypted password is: ");
367
468
for(ssize_t i = 0; i < plaintext_length; i++){
368
469
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
369
470
}
380
481
return plaintext_length;
381
482
}
382
483
383
static const char * safer_gnutls_strerror(int value){
384
const char *ret = gnutls_strerror(value); /* Spurious warning from
385
-Wunreachable-code */
484
__attribute__((warn_unused_result))
485
static const char *safer_gnutls_strerror(int value){
486
const char *ret = gnutls_strerror(value);
386
487
if(ret == NULL)
387
488
ret = "(unknown)";
388
489
return ret;
389
490
}
390
491
391
492
/* GnuTLS log function callback */
493
__attribute__((nonnull))
392
494
static void debuggnutls(__attribute__((unused)) int level,
393
495
const char* string){
394
fprintf(stderr, "GnuTLS: %s", string);
496
fprintf_plus(stderr, "GnuTLS: %s", string);
395
497
}
396
498
499
__attribute__((nonnull, warn_unused_result))
397
500
static int init_gnutls_global(const char *pubkeyfilename,
398
const char *seckeyfilename){
501
const char *seckeyfilename,
502
mandos_context *mc){
399
503
int ret;
400
504
401
505
if(debug){
402
fprintf(stderr, "Initializing GnuTLS\n");
506
fprintf_plus(stderr, "Initializing GnuTLS\n");
403
507
}
404
508
405
509
ret = gnutls_global_init();
406
510
if(ret != GNUTLS_E_SUCCESS){
407
fprintf(stderr, "GnuTLS global_init: %s\n",
408
safer_gnutls_strerror(ret));
511
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
512
safer_gnutls_strerror(ret));
409
513
return -1;
410
514
}
411
515
418
522
}
419
523
420
524
/* OpenPGP credentials */
421
gnutls_certificate_allocate_credentials(&mc.cred);
525
ret = gnutls_certificate_allocate_credentials(&mc->cred);
422
526
if(ret != GNUTLS_E_SUCCESS){
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
427
safer_gnutls_strerror(ret));
527
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
528
safer_gnutls_strerror(ret));
428
529
gnutls_global_deinit();
429
530
return -1;
430
531
}
431
532
432
533
if(debug){
433
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
434
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
435
seckeyfilename);
534
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
535
" secret key %s as GnuTLS credentials\n",
536
pubkeyfilename,
537
seckeyfilename);
436
538
}
437
539
438
540
ret = gnutls_certificate_set_openpgp_key_file
439
(mc.cred, pubkeyfilename, seckeyfilename,
541
(mc->cred, pubkeyfilename, seckeyfilename,
440
542
GNUTLS_OPENPGP_FMT_BASE64);
441
543
if(ret != GNUTLS_E_SUCCESS){
442
fprintf(stderr,
443
"Error[%d] while reading the OpenPGP key pair ('%s',"
444
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
445
fprintf(stderr, "The GnuTLS error is: %s\n",
446
safer_gnutls_strerror(ret));
544
fprintf_plus(stderr,
545
"Error[%d] while reading the OpenPGP key pair ('%s',"
546
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
547
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
548
safer_gnutls_strerror(ret));
447
549
goto globalfail;
448
550
}
449
551
450
552
/* GnuTLS server initialization */
451
ret = gnutls_dh_params_init(&mc.dh_params);
553
ret = gnutls_dh_params_init(&mc->dh_params);
452
554
if(ret != GNUTLS_E_SUCCESS){
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
454
" %s\n", safer_gnutls_strerror(ret));
555
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
556
" initialization: %s\n",
557
safer_gnutls_strerror(ret));
455
558
goto globalfail;
456
559
}
457
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
458
561
if(ret != GNUTLS_E_SUCCESS){
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
460
safer_gnutls_strerror(ret));
562
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
563
safer_gnutls_strerror(ret));
461
564
goto globalfail;
462
565
}
463
566
464
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
465
568
466
569
return 0;
467
570
468
571
globalfail:
469
572
470
gnutls_certificate_free_credentials(mc.cred);
573
gnutls_certificate_free_credentials(mc->cred);
471
574
gnutls_global_deinit();
472
gnutls_dh_params_deinit(mc.dh_params);
575
gnutls_dh_params_deinit(mc->dh_params);
473
576
return -1;
474
577
}
475
578
476
static int init_gnutls_session(gnutls_session_t *session){
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
581
mandos_context *mc){
477
582
int ret;
478
583
/* GnuTLS session creation */
479
ret = gnutls_init(session, GNUTLS_SERVER);
584
do {
585
ret = gnutls_init(session, GNUTLS_SERVER);
586
if(quit_now){
587
return -1;
588
}
589
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
480
590
if(ret != GNUTLS_E_SUCCESS){
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
591
fprintf_plus(stderr,
592
"Error in GnuTLS session initialization: %s\n",
593
safer_gnutls_strerror(ret));
483
594
}
484
595
485
596
{
486
597
const char *err;
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
598
do {
599
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
600
if(quit_now){
601
gnutls_deinit(*session);
602
return -1;
603
}
604
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
605
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Syntax error at: %s\n", err);
490
fprintf(stderr, "GnuTLS error: %s\n",
491
safer_gnutls_strerror(ret));
606
fprintf_plus(stderr, "Syntax error at: %s\n", err);
607
fprintf_plus(stderr, "GnuTLS error: %s\n",
608
safer_gnutls_strerror(ret));
492
609
gnutls_deinit(*session);
493
610
return -1;
494
611
}
495
612
}
496
613
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
614
do {
615
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
616
mc->cred);
617
if(quit_now){
618
gnutls_deinit(*session);
619
return -1;
620
}
621
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
499
622
if(ret != GNUTLS_E_SUCCESS){
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
501
safer_gnutls_strerror(ret));
623
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
624
safer_gnutls_strerror(ret));
502
625
gnutls_deinit(*session);
503
626
return -1;
504
627
}
505
628
506
629
/* ignore client certificate if any. */
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
630
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
509
631
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
632
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
511
633
512
634
return 0;
513
635
}
517
639
__attribute__((unused)) const char *txt){}
518
640
519
641
/* Called when a Mandos server is found */
520
static int start_mandos_communication(const char *ip, uint16_t port,
642
__attribute__((nonnull, warn_unused_result))
643
static int start_mandos_communication(const char *ip, in_port_t port,
521
644
AvahiIfIndex if_index,
522
int af){
523
int ret, tcp_sd;
645
int af, mandos_context *mc){
646
int ret, tcp_sd = -1;
524
647
ssize_t sret;
525
union {
526
struct sockaddr_in in;
527
struct sockaddr_in6 in6;
528
} to;
648
struct sockaddr_storage to;
529
649
char *buffer = NULL;
530
char *decrypted_buffer;
650
char *decrypted_buffer = NULL;
531
651
size_t buffer_length = 0;
532
652
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
534
653
size_t written;
535
int retval = 0;
654
int retval = -1;
536
655
gnutls_session_t session;
537
656
int pf; /* Protocol family */
538
657
658
errno = 0;
659
660
if(quit_now){
661
errno = EINTR;
662
return -1;
663
}
664
539
665
switch(af){
540
666
case AF_INET6:
541
667
pf = PF_INET6;
544
670
pf = PF_INET;
545
671
break;
546
672
default:
547
fprintf(stderr, "Bad address family: %d\n", af);
673
fprintf_plus(stderr, "Bad address family: %d\n", af);
674
errno = EINVAL;
548
675
return -1;
549
676
}
550
677
551
ret = init_gnutls_session(&session);
678
/* If the interface is specified and we have a list of interfaces */
679
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
680
/* Check if the interface is one of the interfaces we are using */
681
bool match = false;
682
{
683
char *interface = NULL;
684
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
685
interface))){
686
if(if_nametoindex(interface) == (unsigned int)if_index){
687
match = true;
688
break;
689
}
690
}
691
}
692
if(not match){
693
/* This interface does not match any in the list, so we don't
694
connect to the server */
695
if(debug){
696
char interface[IF_NAMESIZE];
697
if(if_indextoname((unsigned int)if_index, interface) == NULL){
698
perror_plus("if_indextoname");
699
} else {
700
fprintf_plus(stderr, "Skipping server on non-used interface"
701
" \"%s\"\n",
702
if_indextoname((unsigned int)if_index,
703
interface));
704
}
705
}
706
return -1;
707
}
708
}
709
710
ret = init_gnutls_session(&session, mc);
552
711
if(ret != 0){
553
712
return -1;
554
713
}
555
714
556
715
if(debug){
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
558
"\n", ip, port);
716
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
717
PRIuMAX "\n", ip, (uintmax_t)port);
559
718
}
560
719
561
720
tcp_sd = socket(pf, SOCK_STREAM, 0);
562
721
if(tcp_sd < 0){
563
perror("socket");
564
return -1;
722
int e = errno;
723
perror_plus("socket");
724
errno = e;
725
goto mandos_end;
726
}
727
728
if(quit_now){
729
errno = EINTR;
730
goto mandos_end;
565
731
}
566
732
567
733
memset(&to, 0, sizeof(to));
568
734
if(af == AF_INET6){
569
to.in6.sin6_family = (sa_family_t)af;
570
ret = inet_pton(af, ip, &to.in6.sin6_addr);
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
571
737
} else { /* IPv4 */
572
to.in.sin_family = (sa_family_t)af;
573
ret = inet_pton(af, ip, &to.in.sin_addr);
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
574
740
}
575
741
if(ret < 0 ){
576
perror("inet_pton");
577
return -1;
742
int e = errno;
743
perror_plus("inet_pton");
744
errno = e;
745
goto mandos_end;
578
746
}
579
747
if(ret == 0){
580
fprintf(stderr, "Bad address: %s\n", ip);
581
return -1;
748
int e = errno;
749
fprintf_plus(stderr, "Bad address: %s\n", ip);
750
errno = e;
751
goto mandos_end;
582
752
}
583
753
if(af == AF_INET6){
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
585
-Wconversion and
586
-Wunreachable-code */
587
588
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
589
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
590
-Wunreachable-code*/
754
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
755
if(IN6_IS_ADDR_LINKLOCAL
756
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
591
757
if(if_index == AVAHI_IF_UNSPEC){
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
593
" without a network interface\n");
594
return -1;
758
fprintf_plus(stderr, "An IPv6 link-local address is"
759
" incomplete without a network interface\n");
760
errno = EINVAL;
761
goto mandos_end;
595
762
}
596
763
/* Set the network interface number as scope */
597
to.in6.sin6_scope_id = (uint32_t)if_index;
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
598
765
}
599
766
} else {
600
to.in.sin_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
768
}
769
770
if(quit_now){
771
errno = EINTR;
772
goto mandos_end;
603
773
}
604
774
605
775
if(debug){
606
776
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
607
777
char interface[IF_NAMESIZE];
608
778
if(if_indextoname((unsigned int)if_index, interface) == NULL){
609
perror("if_indextoname");
779
perror_plus("if_indextoname");
610
780
} else {
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
612
ip, interface, port);
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
613
783
}
614
784
} else {
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
616
port);
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
617
787
}
618
788
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
619
789
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
620
const char *pcret;
621
790
if(af == AF_INET6){
622
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
623
sizeof(addrstr));
624
} else {
625
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
626
sizeof(addrstr));
627
}
628
if(pcret == NULL){
629
perror("inet_ntop");
630
} else {
631
if(strcmp(addrstr, ip) != 0){
632
fprintf(stderr, "Canonical address form: %s\n", addrstr);
633
}
634
}
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
794
NI_NUMERICHOST);
795
} else {
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
800
}
801
if(ret == EAI_SYSTEM){
802
perror_plus("getnameinfo");
803
} else if(ret != 0) {
804
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
805
} else if(strcmp(addrstr, ip) != 0){
806
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
807
}
808
}
809
810
if(quit_now){
811
errno = EINTR;
812
goto mandos_end;
635
813
}
636
814
637
815
if(af == AF_INET6){
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
639
818
} else {
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
641
821
}
642
822
if(ret < 0){
643
perror("connect");
644
return -1;
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
824
int e = errno;
825
perror_plus("connect");
826
errno = e;
827
}
828
goto mandos_end;
829
}
830
831
if(quit_now){
832
errno = EINTR;
833
goto mandos_end;
645
834
}
646
835
647
836
const char *out = mandos_protocol_version;
649
838
while(true){
650
839
size_t out_size = strlen(out);
651
840
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
652
out_size - written));
841
out_size - written));
653
842
if(ret == -1){
654
perror("write");
655
retval = -1;
843
int e = errno;
844
perror_plus("write");
845
errno = e;
656
846
goto mandos_end;
657
847
}
658
848
written += (size_t)ret;
666
856
break;
667
857
}
668
858
}
859
860
if(quit_now){
861
errno = EINTR;
862
goto mandos_end;
863
}
669
864
}
670
865
671
866
if(debug){
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
673
}
674
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
676
677
do{
867
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
868
}
869
870
if(quit_now){
871
errno = EINTR;
872
goto mandos_end;
873
}
874
875
/* This casting via intptr_t is to eliminate warning about casting
876
an int to a pointer type. This is exactly how the GnuTLS Guile
877
function "set-session-transport-fd!" does it. */
878
gnutls_transport_set_ptr(session,
879
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
880
881
if(quit_now){
882
errno = EINTR;
883
goto mandos_end;
884
}
885
886
do {
678
887
ret = gnutls_handshake(session);
888
if(quit_now){
889
errno = EINTR;
890
goto mandos_end;
891
}
679
892
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
680
893
681
894
if(ret != GNUTLS_E_SUCCESS){
682
895
if(debug){
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
896
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
684
897
gnutls_perror(ret);
685
898
}
686
retval = -1;
899
errno = EPROTO;
687
900
goto mandos_end;
688
901
}
689
902
690
903
/* Read OpenPGP packet that contains the wanted password */
691
904
692
905
if(debug){
693
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
694
ip);
906
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
907
" %s\n", ip);
695
908
}
696
909
697
910
while(true){
911
912
if(quit_now){
913
errno = EINTR;
914
goto mandos_end;
915
}
916
698
917
buffer_capacity = incbuffer(&buffer, buffer_length,
699
buffer_capacity);
918
buffer_capacity);
700
919
if(buffer_capacity == 0){
701
perror("incbuffer");
702
retval = -1;
920
int e = errno;
921
perror_plus("incbuffer");
922
errno = e;
923
goto mandos_end;
924
}
925
926
if(quit_now){
927
errno = EINTR;
703
928
goto mandos_end;
704
929
}
705
930
714
939
case GNUTLS_E_AGAIN:
715
940
break;
716
941
case GNUTLS_E_REHANDSHAKE:
717
do{
942
do {
718
943
ret = gnutls_handshake(session);
944
945
if(quit_now){
946
errno = EINTR;
947
goto mandos_end;
948
}
719
949
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
720
950
if(ret < 0){
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
951
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
952
"***\n");
722
953
gnutls_perror(ret);
723
retval = -1;
954
errno = EPROTO;
724
955
goto mandos_end;
725
956
}
726
957
break;
727
958
default:
728
fprintf(stderr, "Unknown error while reading data from"
729
" encrypted session with Mandos server\n");
730
retval = -1;
959
fprintf_plus(stderr, "Unknown error while reading data from"
960
" encrypted session with Mandos server\n");
731
961
gnutls_bye(session, GNUTLS_SHUT_RDWR);
962
errno = EIO;
732
963
goto mandos_end;
733
964
}
734
965
} else {
737
968
}
738
969
739
970
if(debug){
740
fprintf(stderr, "Closing TLS session\n");
741
}
742
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
971
fprintf_plus(stderr, "Closing TLS session\n");
972
}
973
974
if(quit_now){
975
errno = EINTR;
976
goto mandos_end;
977
}
978
979
do {
980
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
981
if(quit_now){
982
errno = EINTR;
983
goto mandos_end;
984
}
985
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
744
986
745
987
if(buffer_length > 0){
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
747
buffer_length,
748
&decrypted_buffer);
988
ssize_t decrypted_buffer_size;
989
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
990
&decrypted_buffer, mc);
749
991
if(decrypted_buffer_size >= 0){
992
750
993
written = 0;
751
994
while(written < (size_t) decrypted_buffer_size){
995
if(quit_now){
996
errno = EINTR;
997
goto mandos_end;
998
}
999
752
1000
ret = (int)fwrite(decrypted_buffer + written, 1,
753
1001
(size_t)decrypted_buffer_size - written,
754
1002
stdout);
755
1003
if(ret == 0 and ferror(stdout)){
1004
int e = errno;
756
1005
if(debug){
757
fprintf(stderr, "Error writing encrypted data: %s\n",
758
strerror(errno));
1006
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1007
strerror(errno));
759
1008
}
760
retval = -1;
761
break;
1009
errno = e;
1010
goto mandos_end;
762
1011
}
763
1012
written += (size_t)ret;
764
1013
}
765
free(decrypted_buffer);
766
} else {
767
retval = -1;
1014
retval = 0;
768
1015
}
769
} else {
770
retval = -1;
771
1016
}
772
1017
773
1018
/* Shutdown procedure */
774
1019
775
1020
mandos_end:
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
1021
{
1022
int e = errno;
1023
free(decrypted_buffer);
1024
free(buffer);
1025
if(tcp_sd >= 0){
1026
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1027
}
1028
if(ret == -1){
1029
if(e == 0){
1030
e = errno;
1031
}
1032
perror_plus("close");
1033
}
1034
gnutls_deinit(session);
1035
errno = e;
1036
if(quit_now){
1037
errno = EINTR;
1038
retval = -1;
1039
}
780
1040
}
781
gnutls_deinit(session);
782
1041
return retval;
783
1042
}
784
1043
1044
__attribute__((nonnull))
785
1045
static void resolve_callback(AvahiSServiceResolver *r,
786
1046
AvahiIfIndex interface,
787
1047
AvahiProtocol proto,
795
1055
AVAHI_GCC_UNUSED AvahiStringList *txt,
796
1056
AVAHI_GCC_UNUSED AvahiLookupResultFlags
797
1057
flags,
798
AVAHI_GCC_UNUSED void* userdata){
799
assert(r);
1058
void *mc){
1059
if(r == NULL){
1060
return;
1061
}
800
1062
801
1063
/* Called whenever a service has been resolved successfully or
802
1064
timed out */
803
1065
1066
if(quit_now){
1067
return;
1068
}
1069
804
1070
switch(event){
805
1071
default:
806
1072
case AVAHI_RESOLVER_FAILURE:
807
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
808
" of type '%s' in domain '%s': %s\n", name, type, domain,
809
avahi_strerror(avahi_server_errno(mc.server)));
1073
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1074
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1075
domain,
1076
avahi_strerror(avahi_server_errno
1077
(((mandos_context*)mc)->server)));
810
1078
break;
811
1079
812
1080
case AVAHI_RESOLVER_FOUND:
814
1082
char ip[AVAHI_ADDRESS_STR_MAX];
815
1083
avahi_address_snprint(ip, sizeof(ip), address);
816
1084
if(debug){
817
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
818
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
819
ip, (intmax_t)interface, port);
1085
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1086
PRIdMAX ") on port %" PRIu16 "\n", name,
1087
host_name, ip, (intmax_t)interface, port);
820
1088
}
821
int ret = start_mandos_communication(ip, port, interface,
822
avahi_proto_to_af(proto));
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1090
interface,
1091
avahi_proto_to_af(proto),
1092
mc);
823
1093
if(ret == 0){
824
avahi_simple_poll_quit(mc.simple_poll);
1094
avahi_simple_poll_quit(simple_poll);
1095
} else {
1096
if(not add_server(ip, (in_port_t)port, interface,
1097
avahi_proto_to_af(proto),
1098
&((mandos_context*)mc)->current_server)){
1099
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1100
" list\n", name);
1101
}
825
1102
}
826
1103
}
827
1104
}
837
1114
const char *domain,
838
1115
AVAHI_GCC_UNUSED AvahiLookupResultFlags
839
1116
flags,
840
AVAHI_GCC_UNUSED void* userdata){
841
assert(b);
1117
void *mc){
1118
if(b == NULL){
1119
return;
1120
}
842
1121
843
1122
/* Called whenever a new services becomes available on the LAN or
844
1123
is removed from the LAN */
845
1124
1125
if(quit_now){
1126
return;
1127
}
1128
846
1129
switch(event){
847
1130
default:
848
1131
case AVAHI_BROWSER_FAILURE:
849
1132
850
fprintf(stderr, "(Avahi browser) %s\n",
851
avahi_strerror(avahi_server_errno(mc.server)));
852
avahi_simple_poll_quit(mc.simple_poll);
1133
fprintf_plus(stderr, "(Avahi browser) %s\n",
1134
avahi_strerror(avahi_server_errno
1135
(((mandos_context*)mc)->server)));
1136
avahi_simple_poll_quit(simple_poll);
853
1137
return;
854
1138
855
1139
case AVAHI_BROWSER_NEW:
858
1142
the callback function is called the Avahi server will free the
859
1143
resolver for us. */
860
1144
861
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
862
name, type, domain, protocol, 0,
863
resolve_callback, NULL) == NULL)
864
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
865
name, avahi_strerror(avahi_server_errno(mc.server)));
1145
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1146
interface, protocol, name, type,
1147
domain, protocol, 0,
1148
resolve_callback, mc) == NULL)
1149
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1150
" %s\n", name,
1151
avahi_strerror(avahi_server_errno
1152
(((mandos_context*)mc)->server)));
866
1153
break;
867
1154
868
1155
case AVAHI_BROWSER_REMOVE:
871
1158
case AVAHI_BROWSER_ALL_FOR_NOW:
872
1159
case AVAHI_BROWSER_CACHE_EXHAUSTED:
873
1160
if(debug){
874
fprintf(stderr, "No Mandos server found, still searching...\n");
1161
fprintf_plus(stderr, "No Mandos server found, still"
1162
" searching...\n");
875
1163
}
876
1164
break;
877
1165
}
878
1166
}
879
1167
880
sig_atomic_t quit_now = 0;
881
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
1168
/* Signal handler that stops main loop after SIGTERM */
1169
static void handle_sigterm(int sig){
884
1170
if(quit_now){
885
1171
return;
886
1172
}
887
1173
quit_now = 1;
1174
signal_received = sig;
888
1175
int old_errno = errno;
889
if(mc.simple_poll != NULL){
890
avahi_simple_poll_quit(mc.simple_poll);
891
}
892
errno = old_errno;
1176
/* set main loop to exit */
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1179
}
1180
errno = old_errno;
1181
}
1182
1183
__attribute__((nonnull, warn_unused_result))
1184
bool get_flags(const char *ifname, struct ifreq *ifr){
1185
int ret;
1186
error_t ret_errno;
1187
1188
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1189
if(s < 0){
1190
ret_errno = errno;
1191
perror_plus("socket");
1192
errno = ret_errno;
1193
return false;
1194
}
1195
strcpy(ifr->ifr_name, ifname);
1196
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1197
if(ret == -1){
1198
if(debug){
1199
ret_errno = errno;
1200
perror_plus("ioctl SIOCGIFFLAGS");
1201
errno = ret_errno;
1202
}
1203
return false;
1204
}
1205
return true;
1206
}
1207
1208
__attribute__((nonnull, warn_unused_result))
1209
bool good_flags(const char *ifname, const struct ifreq *ifr){
1210
1211
/* Reject the loopback device */
1212
if(ifr->ifr_flags & IFF_LOOPBACK){
1213
if(debug){
1214
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1215
ifname);
1216
}
1217
return false;
1218
}
1219
/* Accept point-to-point devices only if connect_to is specified */
1220
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1221
if(debug){
1222
fprintf_plus(stderr, "Accepting point-to-point interface"
1223
" \"%s\"\n", ifname);
1224
}
1225
return true;
1226
}
1227
/* Otherwise, reject non-broadcast-capable devices */
1228
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1229
if(debug){
1230
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1231
" \"%s\"\n", ifname);
1232
}
1233
return false;
1234
}
1235
/* Reject non-ARP interfaces (including dummy interfaces) */
1236
if(ifr->ifr_flags & IFF_NOARP){
1237
if(debug){
1238
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1239
ifname);
1240
}
1241
return false;
1242
}
1243
1244
/* Accept this device */
1245
if(debug){
1246
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1247
}
1248
return true;
1249
}
1250
1251
/*
1252
* This function determines if a directory entry in /sys/class/net
1253
* corresponds to an acceptable network device.
1254
* (This function is passed to scandir(3) as a filter function.)
1255
*/
1256
__attribute__((nonnull, warn_unused_result))
1257
int good_interface(const struct dirent *if_entry){
1258
if(if_entry->d_name[0] == '.'){
1259
return 0;
1260
}
1261
1262
struct ifreq ifr;
1263
if(not get_flags(if_entry->d_name, &ifr)){
1264
if(debug){
1265
fprintf_plus(stderr, "Failed to get flags for interface "
1266
"\"%s\"\n", if_entry->d_name);
1267
}
1268
return 0;
1269
}
1270
1271
if(not good_flags(if_entry->d_name, &ifr)){
1272
return 0;
1273
}
1274
return 1;
1275
}
1276
1277
/*
1278
* This function determines if a network interface is up.
1279
*/
1280
__attribute__((nonnull, warn_unused_result))
1281
bool interface_is_up(const char *interface){
1282
struct ifreq ifr;
1283
if(not get_flags(interface, &ifr)){
1284
if(debug){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1287
}
1288
return false;
1289
}
1290
1291
return (bool)(ifr.ifr_flags & IFF_UP);
1292
}
1293
1294
/*
1295
* This function determines if a network interface is running
1296
*/
1297
__attribute__((nonnull, warn_unused_result))
1298
bool interface_is_running(const char *interface){
1299
struct ifreq ifr;
1300
if(not get_flags(interface, &ifr)){
1301
if(debug){
1302
fprintf_plus(stderr, "Failed to get flags for interface "
1303
"\"%s\"\n", interface);
1304
}
1305
return false;
1306
}
1307
1308
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1309
}
1310
1311
__attribute__((nonnull, pure, warn_unused_result))
1312
int notdotentries(const struct dirent *direntry){
1313
/* Skip "." and ".." */
1314
if(direntry->d_name[0] == '.'
1315
and (direntry->d_name[1] == '\0'
1316
or (direntry->d_name[1] == '.'
1317
and direntry->d_name[2] == '\0'))){
1318
return 0;
1319
}
1320
return 1;
1321
}
1322
1323
/* Is this directory entry a runnable program? */
1324
__attribute__((nonnull, warn_unused_result))
1325
int runnable_hook(const struct dirent *direntry){
1326
int ret;
1327
size_t sret;
1328
struct stat st;
1329
1330
if((direntry->d_name)[0] == '\0'){
1331
/* Empty name? */
1332
return 0;
1333
}
1334
1335
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1336
"abcdefghijklmnopqrstuvwxyz"
1337
"0123456789"
1338
"_-");
1339
if((direntry->d_name)[sret] != '\0'){
1340
/* Contains non-allowed characters */
1341
if(debug){
1342
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1343
direntry->d_name);
1344
}
1345
return 0;
1346
}
1347
1348
char *fullname = NULL;
1349
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1350
if(ret < 0){
1351
perror_plus("asprintf");
1352
return 0;
1353
}
1354
1355
ret = stat(fullname, &st);
1356
if(ret == -1){
1357
if(debug){
1358
perror_plus("Could not stat hook");
1359
}
1360
return 0;
1361
}
1362
if(not (S_ISREG(st.st_mode))){
1363
/* Not a regular file */
1364
if(debug){
1365
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1366
direntry->d_name);
1367
}
1368
return 0;
1369
}
1370
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1371
/* Not executable */
1372
if(debug){
1373
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1374
direntry->d_name);
1375
}
1376
return 0;
1377
}
1378
if(debug){
1379
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1380
direntry->d_name);
1381
}
1382
return 1;
1383
}
1384
1385
__attribute__((nonnull, warn_unused_result))
1386
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1387
mandos_context *mc){
1388
int ret;
1389
struct timespec now;
1390
struct timespec waited_time;
1391
intmax_t block_time;
1392
1393
while(true){
1394
if(mc->current_server == NULL){
1395
if(debug){
1396
fprintf_plus(stderr, "Wait until first server is found."
1397
" No timeout!\n");
1398
}
1399
ret = avahi_simple_poll_iterate(s, -1);
1400
} else {
1401
if(debug){
1402
fprintf_plus(stderr, "Check current_server if we should run"
1403
" it, or wait\n");
1404
}
1405
/* the current time */
1406
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1407
if(ret == -1){
1408
perror_plus("clock_gettime");
1409
return -1;
1410
}
1411
/* Calculating in ms how long time between now and server
1412
who we visted longest time ago. Now - last seen. */
1413
waited_time.tv_sec = (now.tv_sec
1414
- mc->current_server->last_seen.tv_sec);
1415
waited_time.tv_nsec = (now.tv_nsec
1416
- mc->current_server->last_seen.tv_nsec);
1417
/* total time is 10s/10,000ms.
1418
Converting to s from ms by dividing by 1,000,
1419
and ns to ms by dividing by 1,000,000. */
1420
block_time = ((retry_interval
1421
- ((intmax_t)waited_time.tv_sec * 1000))
1422
- ((intmax_t)waited_time.tv_nsec / 1000000));
1423
1424
if(debug){
1425
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1426
block_time);
1427
}
1428
1429
if(block_time <= 0){
1430
ret = start_mandos_communication(mc->current_server->ip,
1431
mc->current_server->port,
1432
mc->current_server->if_index,
1433
mc->current_server->af, mc);
1434
if(ret == 0){
1435
avahi_simple_poll_quit(s);
1436
return 0;
1437
}
1438
ret = clock_gettime(CLOCK_MONOTONIC,
1439
&mc->current_server->last_seen);
1440
if(ret == -1){
1441
perror_plus("clock_gettime");
1442
return -1;
1443
}
1444
mc->current_server = mc->current_server->next;
1445
block_time = 0; /* Call avahi to find new Mandos
1446
servers, but don't block */
1447
}
1448
1449
ret = avahi_simple_poll_iterate(s, (int)block_time);
1450
}
1451
if(ret != 0){
1452
if(ret > 0 or errno != EINTR){
1453
return (ret != 1) ? ret : 0;
1454
}
1455
}
1456
}
1457
}
1458
1459
/* Set effective uid to 0, return errno */
1460
__attribute__((warn_unused_result))
1461
error_t raise_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(0) == -1){
1465
ret_errno = errno;
1466
perror_plus("seteuid");
1467
}
1468
errno = old_errno;
1469
return ret_errno;
1470
}
1471
1472
/* Set effective and real user ID to 0. Return errno. */
1473
__attribute__((warn_unused_result))
1474
error_t raise_privileges_permanently(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = raise_privileges();
1477
if(ret_errno != 0){
1478
errno = old_errno;
1479
return ret_errno;
1480
}
1481
if(setuid(0) == -1){
1482
ret_errno = errno;
1483
perror_plus("seteuid");
1484
}
1485
errno = old_errno;
1486
return ret_errno;
1487
}
1488
1489
/* Set effective user ID to unprivileged saved user ID */
1490
__attribute__((warn_unused_result))
1491
error_t lower_privileges(void){
1492
error_t old_errno = errno;
1493
error_t ret_errno = 0;
1494
if(seteuid(uid) == -1){
1495
ret_errno = errno;
1496
perror_plus("seteuid");
1497
}
1498
errno = old_errno;
1499
return ret_errno;
1500
}
1501
1502
/* Lower privileges permanently */
1503
__attribute__((warn_unused_result))
1504
error_t lower_privileges_permanently(void){
1505
error_t old_errno = errno;
1506
error_t ret_errno = 0;
1507
if(setuid(uid) == -1){
1508
ret_errno = errno;
1509
perror_plus("setuid");
1510
}
1511
errno = old_errno;
1512
return ret_errno;
1513
}
1514
1515
__attribute__((nonnull))
1516
void run_network_hooks(const char *mode, const char *interface,
1517
const float delay){
1518
struct dirent **direntries;
1519
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1520
alphasort);
1521
if(numhooks == -1){
1522
if(errno == ENOENT){
1523
if(debug){
1524
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1525
" found\n", hookdir);
1526
}
1527
} else {
1528
perror_plus("scandir");
1529
}
1530
} else {
1531
struct dirent *direntry;
1532
int ret;
1533
int devnull = open("/dev/null", O_RDONLY);
1534
for(int i = 0; i < numhooks; i++){
1535
direntry = direntries[i];
1536
char *fullname = NULL;
1537
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1538
if(ret < 0){
1539
perror_plus("asprintf");
1540
continue;
1541
}
1542
if(debug){
1543
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1544
direntry->d_name);
1545
}
1546
pid_t hook_pid = fork();
1547
if(hook_pid == 0){
1548
/* Child */
1549
/* Raise privileges */
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1552
_exit(EX_NOPERM);
1553
}
1554
/* Set group */
1555
errno = 0;
1556
ret = setgid(0);
1557
if(ret == -1){
1558
perror_plus("setgid");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Reset supplementary groups */
1562
errno = 0;
1563
ret = setgroups(0, NULL);
1564
if(ret == -1){
1565
perror_plus("setgroups");
1566
_exit(EX_NOPERM);
1567
}
1568
ret = dup2(devnull, STDIN_FILENO);
1569
if(ret == -1){
1570
perror_plus("dup2(devnull, STDIN_FILENO)");
1571
_exit(EX_OSERR);
1572
}
1573
ret = close(devnull);
1574
if(ret == -1){
1575
perror_plus("close");
1576
_exit(EX_OSERR);
1577
}
1578
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1579
if(ret == -1){
1580
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1581
_exit(EX_OSERR);
1582
}
1583
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1584
if(ret == -1){
1585
perror_plus("setenv");
1586
_exit(EX_OSERR);
1587
}
1588
ret = setenv("DEVICE", interface, 1);
1589
if(ret == -1){
1590
perror_plus("setenv");
1591
_exit(EX_OSERR);
1592
}
1593
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1594
if(ret == -1){
1595
perror_plus("setenv");
1596
_exit(EX_OSERR);
1597
}
1598
ret = setenv("MODE", mode, 1);
1599
if(ret == -1){
1600
perror_plus("setenv");
1601
_exit(EX_OSERR);
1602
}
1603
char *delaystring;
1604
ret = asprintf(&delaystring, "%f", (double)delay);
1605
if(ret == -1){
1606
perror_plus("asprintf");
1607
_exit(EX_OSERR);
1608
}
1609
ret = setenv("DELAY", delaystring, 1);
1610
if(ret == -1){
1611
free(delaystring);
1612
perror_plus("setenv");
1613
_exit(EX_OSERR);
1614
}
1615
free(delaystring);
1616
if(connect_to != NULL){
1617
ret = setenv("CONNECT", connect_to, 1);
1618
if(ret == -1){
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
}
1623
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1624
perror_plus("execl");
1625
_exit(EXIT_FAILURE);
1626
}
1627
} else {
1628
int status;
1629
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1630
perror_plus("waitpid");
1631
free(fullname);
1632
continue;
1633
}
1634
if(WIFEXITED(status)){
1635
if(WEXITSTATUS(status) != 0){
1636
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1637
" with status %d\n", direntry->d_name,
1638
WEXITSTATUS(status));
1639
free(fullname);
1640
continue;
1641
}
1642
} else if(WIFSIGNALED(status)){
1643
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1644
" signal %d\n", direntry->d_name,
1645
WTERMSIG(status));
1646
free(fullname);
1647
continue;
1648
} else {
1649
fprintf_plus(stderr, "Warning: network hook \"%s\""
1650
" crashed\n", direntry->d_name);
1651
free(fullname);
1652
continue;
1653
}
1654
}
1655
free(fullname);
1656
if(debug){
1657
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1658
direntry->d_name);
1659
}
1660
}
1661
close(devnull);
1662
}
1663
}
1664
1665
__attribute__((nonnull, warn_unused_result))
1666
error_t bring_up_interface(const char *const interface,
1667
const float delay){
1668
error_t old_errno = errno;
1669
int ret;
1670
struct ifreq network;
1671
unsigned int if_index = if_nametoindex(interface);
1672
if(if_index == 0){
1673
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1674
errno = old_errno;
1675
return ENXIO;
1676
}
1677
1678
if(quit_now){
1679
errno = old_errno;
1680
return EINTR;
1681
}
1682
1683
if(not interface_is_up(interface)){
1684
error_t ret_errno = 0, ioctl_errno = 0;
1685
if(not get_flags(interface, &network)){
1686
ret_errno = errno;
1687
fprintf_plus(stderr, "Failed to get flags for interface "
1688
"\"%s\"\n", interface);
1689
errno = old_errno;
1690
return ret_errno;
1691
}
1692
network.ifr_flags |= IFF_UP; /* set flag */
1693
1694
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1695
if(sd == -1){
1696
ret_errno = errno;
1697
perror_plus("socket");
1698
errno = old_errno;
1699
return ret_errno;
1700
}
1701
1702
if(quit_now){
1703
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1704
if(ret == -1){
1705
perror_plus("close");
1706
}
1707
errno = old_errno;
1708
return EINTR;
1709
}
1710
1711
if(debug){
1712
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1713
interface);
1714
}
1715
1716
/* Raise privileges */
1717
ret_errno = raise_privileges();
1718
bool restore_loglevel = false;
1719
if(ret_errno != 0){
1720
perror_plus("Failed to raise privileges");
1721
}
1722
#ifdef __linux__
1723
int ret_linux;
1724
if(ret_errno == 0){
1725
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1726
messages about the network interface to mess up the prompt */
1727
ret_linux = klogctl(8, NULL, 5);
1728
if(ret_linux == -1){
1729
perror_plus("klogctl");
1730
} else {
1731
restore_loglevel = true;
1732
}
1733
}
1734
#endif /* __linux__ */
1735
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1736
ioctl_errno = errno;
1737
#ifdef __linux__
1738
if(restore_loglevel){
1739
ret_linux = klogctl(7, NULL, 0);
1740
if(ret_linux == -1){
1741
perror_plus("klogctl");
1742
}
1743
}
1744
#endif /* __linux__ */
1745
1746
/* If raise_privileges() succeeded above */
1747
if(ret_errno == 0){
1748
/* Lower privileges */
1749
ret_errno = lower_privileges();
1750
if(ret_errno != 0){
1751
errno = ret_errno;
1752
perror_plus("Failed to lower privileges");
1753
}
1754
}
1755
1756
/* Close the socket */
1757
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1758
if(ret == -1){
1759
perror_plus("close");
1760
}
1761
1762
if(ret_setflags == -1){
1763
errno = ioctl_errno;
1764
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1765
errno = old_errno;
1766
return ioctl_errno;
1767
}
1768
} else if(debug){
1769
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1770
interface);
1771
}
1772
1773
/* Sleep checking until interface is running.
1774
Check every 0.25s, up to total time of delay */
1775
for(int i=0; i < delay * 4; i++){
1776
if(interface_is_running(interface)){
1777
break;
1778
}
1779
struct timespec sleeptime = { .tv_nsec = 250000000 };
1780
ret = nanosleep(&sleeptime, NULL);
1781
if(ret == -1 and errno != EINTR){
1782
perror_plus("nanosleep");
1783
}
1784
}
1785
1786
errno = old_errno;
1787
return 0;
1788
}
1789
1790
__attribute__((nonnull, warn_unused_result))
1791
error_t take_down_interface(const char *const interface){
1792
error_t old_errno = errno;
1793
struct ifreq network;
1794
unsigned int if_index = if_nametoindex(interface);
1795
if(if_index == 0){
1796
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1797
errno = old_errno;
1798
return ENXIO;
1799
}
1800
if(interface_is_up(interface)){
1801
error_t ret_errno = 0, ioctl_errno = 0;
1802
if(not get_flags(interface, &network) and debug){
1803
ret_errno = errno;
1804
fprintf_plus(stderr, "Failed to get flags for interface "
1805
"\"%s\"\n", interface);
1806
errno = old_errno;
1807
return ret_errno;
1808
}
1809
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1810
1811
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1812
if(sd == -1){
1813
ret_errno = errno;
1814
perror_plus("socket");
1815
errno = old_errno;
1816
return ret_errno;
1817
}
1818
1819
if(debug){
1820
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1821
interface);
1822
}
1823
1824
/* Raise privileges */
1825
ret_errno = raise_privileges();
1826
if(ret_errno != 0){
1827
perror_plus("Failed to raise privileges");
1828
}
1829
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1830
ioctl_errno = errno;
1831
1832
/* If raise_privileges() succeeded above */
1833
if(ret_errno == 0){
1834
/* Lower privileges */
1835
ret_errno = lower_privileges();
1836
if(ret_errno != 0){
1837
errno = ret_errno;
1838
perror_plus("Failed to lower privileges");
1839
}
1840
}
1841
1842
/* Close the socket */
1843
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1844
if(ret == -1){
1845
perror_plus("close");
1846
}
1847
1848
if(ret_setflags == -1){
1849
errno = ioctl_errno;
1850
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1851
errno = old_errno;
1852
return ioctl_errno;
1853
}
1854
} else if(debug){
1855
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1856
interface);
1857
}
1858
1859
errno = old_errno;
1860
return 0;
893
1861
}
894
1862
895
1863
int main(int argc, char *argv[]){
1864
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1865
.priority = "SECURE256:!CTYPE-X.509:"
1866
"+CTYPE-OPENPGP", .current_server = NULL,
1867
.interfaces = NULL, .interfaces_size = 0 };
896
1868
AvahiSServiceBrowser *sb = NULL;
897
int error;
1869
error_t ret_errno;
898
1870
int ret;
899
1871
intmax_t tmpmax;
900
1872
char *tmp;
901
1873
int exitcode = EXIT_SUCCESS;
902
const char *interface = "eth0";
903
struct ifreq network;
904
int sd;
905
uid_t uid;
906
gid_t gid;
907
char *connect_to = NULL;
908
char tempdir[] = "/tmp/mandosXXXXXX";
909
bool tempdir_created = false;
1874
char *interfaces_to_take_down = NULL;
1875
size_t interfaces_to_take_down_size = 0;
1876
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1877
char old_tempdir[] = "/tmp/mandosXXXXXX";
1878
char *tempdir = NULL;
910
1879
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
911
1880
const char *seckey = PATHDIR "/" SECKEY;
912
1881
const char *pubkey = PATHDIR "/" PUBKEY;
1882
char *interfaces_hooks = NULL;
913
1883
914
1884
bool gnutls_initialized = false;
915
1885
bool gpgme_initialized = false;
916
1886
float delay = 2.5f;
1887
double retry_interval = 10; /* 10s between trying a server and
1888
retrying the same server again */
917
1889
918
struct sigaction old_sigterm_action;
1890
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
919
1891
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
920
1892
1893
uid = getuid();
1894
gid = getgid();
1895
1896
/* Lower any group privileges we might have, just to be safe */
1897
errno = 0;
1898
ret = setgid(gid);
1899
if(ret == -1){
1900
perror_plus("setgid");
1901
}
1902
1903
/* Lower user privileges (temporarily) */
1904
errno = 0;
1905
ret = seteuid(uid);
1906
if(ret == -1){
1907
perror_plus("seteuid");
1908
}
1909
1910
if(quit_now){
1911
goto end;
1912
}
1913
921
1914
{
922
1915
struct argp_option options[] = {
923
1916
{ .name = "debug", .key = 128,
952
1945
.arg = "SECONDS",
953
1946
.doc = "Maximum delay to wait for interface startup",
954
1947
.group = 2 },
1948
{ .name = "retry", .key = 132,
1949
.arg = "SECONDS",
1950
.doc = "Retry interval used when denied by the Mandos server",
1951
.group = 2 },
1952
{ .name = "network-hook-dir", .key = 133,
1953
.arg = "DIR",
1954
.doc = "Directory where network hooks are located",
1955
.group = 2 },
1956
/*
1957
* These reproduce what we would get without ARGP_NO_HELP
1958
*/
1959
{ .name = "help", .key = '?',
1960
.doc = "Give this help list", .group = -1 },
1961
{ .name = "usage", .key = -3,
1962
.doc = "Give a short usage message", .group = -1 },
1963
{ .name = "version", .key = 'V',
1964
.doc = "Print program version", .group = -1 },
955
1965
{ .name = NULL }
956
1966
};
957
1967
958
1968
error_t parse_opt(int key, char *arg,
959
1969
struct argp_state *state){
1970
errno = 0;
960
1971
switch(key){
961
1972
case 128: /* --debug */
962
1973
debug = true;
965
1976
connect_to = arg;
966
1977
break;
967
1978
case 'i': /* --interface */
968
interface = arg;
1979
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1980
arg, (int)',');
1981
if(ret_errno != 0){
1982
argp_error(state, "%s", strerror(ret_errno));
1983
}
969
1984
break;
970
1985
case 's': /* --seckey */
971
1986
seckey = arg;
978
1993
tmpmax = strtoimax(arg, &tmp, 10);
979
1994
if(errno != 0 or tmp == arg or *tmp != '\0'
980
1995
or tmpmax != (typeof(mc.dh_bits))tmpmax){
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
1996
argp_error(state, "Bad number of DH bits");
983
1997
}
984
1998
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
985
1999
break;
990
2004
errno = 0;
991
2005
delay = strtof(arg, &tmp);
992
2006
if(errno != 0 or tmp == arg or *tmp != '\0'){
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
995
}
996
break;
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
2007
argp_error(state, "Bad delay");
2008
}
2009
case 132: /* --retry */
2010
errno = 0;
2011
retry_interval = strtod(arg, &tmp);
2012
if(errno != 0 or tmp == arg or *tmp != '\0'
2013
or (retry_interval * 1000) > INT_MAX
2014
or retry_interval < 0){
2015
argp_error(state, "Bad retry interval");
2016
}
2017
break;
2018
case 133: /* --network-hook-dir */
2019
hookdir = arg;
2020
break;
2021
/*
2022
* These reproduce what we would get without ARGP_NO_HELP
2023
*/
2024
case '?': /* --help */
2025
argp_state_help(state, state->out_stream,
2026
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2027
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2028
case -3: /* --usage */
2029
argp_state_help(state, state->out_stream,
2030
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2031
case 'V': /* --version */
2032
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2033
exit(argp_err_exit_status);
1000
2034
break;
1001
2035
default:
1002
2036
return ARGP_ERR_UNKNOWN;
1003
2037
}
1004
return 0;
2038
return errno;
1005
2039
}
1006
2040
1007
2041
struct argp argp = { .options = options, .parser = parse_opt,
1008
2042
.args_doc = "",
1009
2043
.doc = "Mandos client -- Get and decrypt"
1010
2044
" passwords from a Mandos server" };
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1015
goto end;
1016
}
2045
ret = argp_parse(&argp, argc, argv,
2046
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2047
switch(ret){
2048
case 0:
2049
break;
2050
case ENOMEM:
2051
default:
2052
errno = ret;
2053
perror_plus("argp_parse");
2054
exitcode = EX_OSERR;
2055
goto end;
2056
case EINVAL:
2057
exitcode = EX_USAGE;
2058
goto end;
2059
}
2060
}
2061
2062
{
2063
/* Work around Debian bug #633582:
2064
<http://bugs.debian.org/633582> */
2065
2066
/* Re-raise privileges */
2067
ret_errno = raise_privileges();
2068
if(ret_errno != 0){
2069
errno = ret_errno;
2070
perror_plus("Failed to raise privileges");
2071
} else {
2072
struct stat st;
2073
2074
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2075
int seckey_fd = open(seckey, O_RDONLY);
2076
if(seckey_fd == -1){
2077
perror_plus("open");
2078
} else {
2079
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2080
if(ret == -1){
2081
perror_plus("fstat");
2082
} else {
2083
if(S_ISREG(st.st_mode)
2084
and st.st_uid == 0 and st.st_gid == 0){
2085
ret = fchown(seckey_fd, uid, gid);
2086
if(ret == -1){
2087
perror_plus("fchown");
2088
}
2089
}
2090
}
2091
TEMP_FAILURE_RETRY(close(seckey_fd));
2092
}
2093
}
2094
2095
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2096
int pubkey_fd = open(pubkey, O_RDONLY);
2097
if(pubkey_fd == -1){
2098
perror_plus("open");
2099
} else {
2100
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2101
if(ret == -1){
2102
perror_plus("fstat");
2103
} else {
2104
if(S_ISREG(st.st_mode)
2105
and st.st_uid == 0 and st.st_gid == 0){
2106
ret = fchown(pubkey_fd, uid, gid);
2107
if(ret == -1){
2108
perror_plus("fchown");
2109
}
2110
}
2111
}
2112
TEMP_FAILURE_RETRY(close(pubkey_fd));
2113
}
2114
}
2115
2116
/* Lower privileges */
2117
ret_errno = lower_privileges();
2118
if(ret_errno != 0){
2119
errno = ret_errno;
2120
perror_plus("Failed to lower privileges");
2121
}
2122
}
2123
}
2124
2125
/* Remove invalid interface names (except "none") */
2126
{
2127
char *interface = NULL;
2128
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2129
interface))){
2130
if(strcmp(interface, "none") != 0
2131
and if_nametoindex(interface) == 0){
2132
if(interface[0] != '\0'){
2133
fprintf_plus(stderr, "Not using nonexisting interface"
2134
" \"%s\"\n", interface);
2135
}
2136
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2137
interface = NULL;
2138
}
2139
}
2140
}
2141
2142
/* Run network hooks */
2143
{
2144
if(mc.interfaces != NULL){
2145
interfaces_hooks = malloc(mc.interfaces_size);
2146
if(interfaces_hooks == NULL){
2147
perror_plus("malloc");
2148
goto end;
2149
}
2150
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2151
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2152
}
2153
run_network_hooks("start", interfaces_hooks != NULL ?
2154
interfaces_hooks : "", delay);
1017
2155
}
1018
2156
1019
2157
if(not debug){
1024
2162
from the signal handler */
1025
2163
/* Initialize the pseudo-RNG for Avahi */
1026
2164
srand((unsigned int) time(NULL));
1027
mc.simple_poll = avahi_simple_poll_new();
1028
if(mc.simple_poll == NULL){
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
2165
simple_poll = avahi_simple_poll_new();
2166
if(simple_poll == NULL){
2167
fprintf_plus(stderr,
2168
"Avahi: Failed to create simple poll object.\n");
2169
exitcode = EX_UNAVAILABLE;
1031
2170
goto end;
1032
2171
}
1033
2172
1034
2173
sigemptyset(&sigterm_action.sa_mask);
1035
2174
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1036
2175
if(ret == -1){
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
2176
perror_plus("sigaddset");
2177
exitcode = EX_OSERR;
1039
2178
goto end;
1040
2179
}
1041
2180
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1042
2181
if(ret == -1){
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
2182
perror_plus("sigaddset");
2183
exitcode = EX_OSERR;
1045
2184
goto end;
1046
2185
}
1047
2186
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1048
2187
if(ret == -1){
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1051
goto end;
1052
}
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
if(ret == -1){
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1059
1060
/* If the interface is down, bring it up */
1061
if(interface[0] != '\0'){
1062
#ifdef __linux__
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1064
messages to mess up the prompt */
1065
ret = klogctl(8, NULL, 5);
1066
bool restore_loglevel = true;
1067
if(ret == -1){
1068
restore_loglevel = false;
1069
perror("klogctl");
1070
}
1071
#endif /* __linux__ */
1072
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1074
if(sd < 0){
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1077
#ifdef __linux__
1078
if(restore_loglevel){
1079
ret = klogctl(7, NULL, 0);
1080
if(ret == -1){
1081
perror("klogctl");
1082
}
1083
}
1084
#endif /* __linux__ */
1085
goto end;
1086
}
1087
strcpy(network.ifr_name, interface);
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1089
if(ret == -1){
1090
perror("ioctl SIOCGIFFLAGS");
1091
#ifdef __linux__
1092
if(restore_loglevel){
1093
ret = klogctl(7, NULL, 0);
1094
if(ret == -1){
1095
perror("klogctl");
1096
}
1097
}
1098
#endif /* __linux__ */
1099
exitcode = EXIT_FAILURE;
1100
goto end;
1101
}
1102
if((network.ifr_flags & IFF_UP) == 0){
1103
network.ifr_flags |= IFF_UP;
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1105
if(ret == -1){
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1108
#ifdef __linux__
1109
if(restore_loglevel){
1110
ret = klogctl(7, NULL, 0);
1111
if(ret == -1){
1112
perror("klogctl");
2188
perror_plus("sigaddset");
2189
exitcode = EX_OSERR;
2190
goto end;
2191
}
2192
/* Need to check if the handler is SIG_IGN before handling:
2193
| [[info:libc:Initial Signal Actions]] |
2194
| [[info:libc:Basic Signal Handling]] |
2195
*/
2196
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2197
if(ret == -1){
2198
perror_plus("sigaction");
2199
return EX_OSERR;
2200
}
2201
if(old_sigterm_action.sa_handler != SIG_IGN){
2202
ret = sigaction(SIGINT, &sigterm_action, NULL);
2203
if(ret == -1){
2204
perror_plus("sigaction");
2205
exitcode = EX_OSERR;
2206
goto end;
2207
}
2208
}
2209
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2210
if(ret == -1){
2211
perror_plus("sigaction");
2212
return EX_OSERR;
2213
}
2214
if(old_sigterm_action.sa_handler != SIG_IGN){
2215
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2216
if(ret == -1){
2217
perror_plus("sigaction");
2218
exitcode = EX_OSERR;
2219
goto end;
2220
}
2221
}
2222
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2223
if(ret == -1){
2224
perror_plus("sigaction");
2225
return EX_OSERR;
2226
}
2227
if(old_sigterm_action.sa_handler != SIG_IGN){
2228
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2229
if(ret == -1){
2230
perror_plus("sigaction");
2231
exitcode = EX_OSERR;
2232
goto end;
2233
}
2234
}
2235
2236
/* If no interfaces were specified, make a list */
2237
if(mc.interfaces == NULL){
2238
struct dirent **direntries;
2239
/* Look for any good interfaces */
2240
ret = scandir(sys_class_net, &direntries, good_interface,
2241
alphasort);
2242
if(ret >= 1){
2243
/* Add all found interfaces to interfaces list */
2244
for(int i = 0; i < ret; ++i){
2245
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2246
direntries[i]->d_name);
2247
if(ret_errno != 0){
2248
errno = ret_errno;
2249
perror_plus("argz_add");
2250
continue;
2251
}
2252
if(debug){
2253
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2254
direntries[i]->d_name);
2255
}
2256
}
2257
free(direntries);
2258
} else {
2259
free(direntries);
2260
fprintf_plus(stderr, "Could not find a network interface\n");
2261
exitcode = EXIT_FAILURE;
2262
goto end;
2263
}
2264
}
2265
2266
/* Bring up interfaces which are down, and remove any "none"s */
2267
{
2268
char *interface = NULL;
2269
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2270
interface))){
2271
/* If interface name is "none", stop bringing up interfaces.
2272
Also remove all instances of "none" from the list */
2273
if(strcmp(interface, "none") == 0){
2274
argz_delete(&mc.interfaces, &mc.interfaces_size,
2275
interface);
2276
interface = NULL;
2277
while((interface = argz_next(mc.interfaces,
2278
mc.interfaces_size, interface))){
2279
if(strcmp(interface, "none") == 0){
2280
argz_delete(&mc.interfaces, &mc.interfaces_size,
2281
interface);
2282
interface = NULL;
1113
2283
}
1114
2284
}
1115
#endif /* __linux__ */
1116
goto end;
1117
}
1118
}
1119
/* sleep checking until interface is running */
1120
for(int i=0; i < delay * 4; i++){
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1122
if(ret == -1){
1123
perror("ioctl SIOCGIFFLAGS");
1124
} else if(network.ifr_flags & IFF_RUNNING){
1125
2285
break;
1126
2286
}
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1128
ret = nanosleep(&sleeptime, NULL);
1129
if(ret == -1 and errno != EINTR){
1130
perror("nanosleep");
1131
}
1132
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1136
}
1137
#ifdef __linux__
1138
if(restore_loglevel){
1139
/* Restores kernel loglevel to default */
1140
ret = klogctl(7, NULL, 0);
1141
if(ret == -1){
1142
perror("klogctl");
1143
}
1144
}
1145
#endif /* __linux__ */
1146
}
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
errno = 0;
1152
setgid(gid);
1153
if(ret == -1){
1154
perror("setgid");
1155
}
1156
1157
ret = setuid(uid);
1158
if(ret == -1){
1159
perror("setuid");
1160
}
1161
1162
ret = init_gnutls_global(pubkey, seckey);
1163
if(ret == -1){
1164
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
2287
bool interface_was_up = interface_is_up(interface);
2288
errno = bring_up_interface(interface, delay);
2289
if(not interface_was_up){
2290
if(errno != 0){
2291
perror_plus("Failed to bring up interface");
2292
} else {
2293
errno = argz_add(&interfaces_to_take_down,
2294
&interfaces_to_take_down_size,
2295
interface);
2296
if(errno != 0){
2297
perror_plus("argz_add");
2298
}
2299
}
2300
}
2301
}
2302
if(debug and (interfaces_to_take_down == NULL)){
2303
fprintf_plus(stderr, "No interfaces were brought up\n");
2304
}
2305
}
2306
2307
/* If we only got one interface, explicitly use only that one */
2308
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2309
if(debug){
2310
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2311
mc.interfaces);
2312
}
2313
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2314
}
2315
2316
if(quit_now){
2317
goto end;
2318
}
2319
2320
ret = init_gnutls_global(pubkey, seckey, &mc);
2321
if(ret == -1){
2322
fprintf_plus(stderr, "init_gnutls_global failed\n");
2323
exitcode = EX_UNAVAILABLE;
1166
2324
goto end;
1167
2325
} else {
1168
2326
gnutls_initialized = true;
1169
2327
}
1170
2328
1171
if(mkdtemp(tempdir) == NULL){
1172
perror("mkdtemp");
1173
goto end;
1174
}
1175
tempdir_created = true;
1176
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
1178
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
2329
if(quit_now){
2330
goto end;
2331
}
2332
2333
/* Try /run/tmp before /tmp */
2334
tempdir = mkdtemp(run_tempdir);
2335
if(tempdir == NULL and errno == ENOENT){
2336
if(debug){
2337
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2338
run_tempdir, old_tempdir);
2339
}
2340
tempdir = mkdtemp(old_tempdir);
2341
}
2342
if(tempdir == NULL){
2343
perror_plus("mkdtemp");
2344
goto end;
2345
}
2346
2347
if(quit_now){
2348
goto end;
2349
}
2350
2351
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2352
fprintf_plus(stderr, "init_gpgme failed\n");
2353
exitcode = EX_UNAVAILABLE;
1180
2354
goto end;
1181
2355
} else {
1182
2356
gpgme_initialized = true;
1183
2357
}
1184
2358
1185
if(interface[0] != '\0'){
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
1187
if(if_index == 0){
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1190
goto end;
1191
}
2359
if(quit_now){
2360
goto end;
1192
2361
}
1193
2362
1194
2363
if(connect_to != NULL){
1195
2364
/* Connect directly, do not use Zeroconf */
1196
2365
/* (Mainly meant for debugging) */
1197
2366
char *address = strrchr(connect_to, ':');
2367
1198
2368
if(address == NULL){
1199
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
1203
uint16_t port;
2369
fprintf_plus(stderr, "No colon in address\n");
2370
exitcode = EX_USAGE;
2371
goto end;
2372
}
2373
2374
if(quit_now){
2375
goto end;
2376
}
2377
2378
in_port_t port;
1204
2379
errno = 0;
1205
2380
tmpmax = strtoimax(address+1, &tmp, 10);
1206
2381
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1207
or tmpmax != (uint16_t)tmpmax){
1208
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
1212
port = (uint16_t)tmpmax;
2382
or tmpmax != (in_port_t)tmpmax){
2383
fprintf_plus(stderr, "Bad port number\n");
2384
exitcode = EX_USAGE;
2385
goto end;
2386
}
2387
2388
if(quit_now){
2389
goto end;
2390
}
2391
2392
port = (in_port_t)tmpmax;
1213
2393
*address = '\0';
1214
address = connect_to;
1215
2394
/* Colon in address indicates IPv6 */
1216
2395
int af;
1217
if(strchr(address, ':') != NULL){
2396
if(strchr(connect_to, ':') != NULL){
1218
2397
af = AF_INET6;
2398
/* Accept [] around IPv6 address - see RFC 5952 */
2399
if(connect_to[0] == '[' and address[-1] == ']')
2400
{
2401
connect_to++;
2402
address[-1] = '\0';
2403
}
1219
2404
} else {
1220
2405
af = AF_INET;
1221
2406
}
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
2407
address = connect_to;
2408
2409
if(quit_now){
2410
goto end;
2411
}
2412
2413
while(not quit_now){
2414
ret = start_mandos_communication(address, port, if_index, af,
2415
&mc);
2416
if(quit_now or ret == 0){
2417
break;
2418
}
2419
if(debug){
2420
fprintf_plus(stderr, "Retrying in %d seconds\n",
2421
(int)retry_interval);
2422
}
2423
sleep((unsigned int)retry_interval);
2424
}
2425
2426
if(not quit_now){
1226
2427
exitcode = EXIT_SUCCESS;
1227
2428
}
1228
goto end;
1229
}
1230
2429
2430
goto end;
2431
}
2432
2433
if(quit_now){
2434
goto end;
2435
}
2436
1231
2437
{
1232
2438
AvahiServerConfig config;
1233
2439
/* Do not publish any local Zeroconf records */
1238
2444
config.publish_domain = 0;
1239
2445
1240
2446
/* Allocate a new server */
1241
mc.server = avahi_server_new(avahi_simple_poll_get
1242
(mc.simple_poll), &config, NULL,
1243
NULL, &error);
2447
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2448
&config, NULL, NULL, &ret_errno);
1244
2449
1245
2450
/* Free the Avahi configuration data */
1246
2451
avahi_server_config_free(&config);
1248
2453
1249
2454
/* Check if creating the Avahi server object succeeded */
1250
2455
if(mc.server == NULL){
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
1252
avahi_strerror(error));
1253
exitcode = EXIT_FAILURE;
2456
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2457
avahi_strerror(ret_errno));
2458
exitcode = EX_UNAVAILABLE;
2459
goto end;
2460
}
2461
2462
if(quit_now){
1254
2463
goto end;
1255
2464
}
1256
2465
1257
2466
/* Create the Avahi service browser */
1258
2467
sb = avahi_s_service_browser_new(mc.server, if_index,
1259
2468
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1260
NULL, 0, browse_callback, NULL);
2469
NULL, 0, browse_callback,
2470
(void *)&mc);
1261
2471
if(sb == NULL){
1262
fprintf(stderr, "Failed to create service browser: %s\n",
1263
avahi_strerror(avahi_server_errno(mc.server)));
1264
exitcode = EXIT_FAILURE;
2472
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2473
avahi_strerror(avahi_server_errno(mc.server)));
2474
exitcode = EX_UNAVAILABLE;
2475
goto end;
2476
}
2477
2478
if(quit_now){
1265
2479
goto end;
1266
2480
}
1267
2481
1268
2482
/* Run the main loop */
1269
2483
1270
2484
if(debug){
1271
fprintf(stderr, "Starting Avahi loop search\n");
1272
}
1273
1274
avahi_simple_poll_loop(mc.simple_poll);
2485
fprintf_plus(stderr, "Starting Avahi loop search\n");
2486
}
2487
2488
ret = avahi_loop_with_timeout(simple_poll,
2489
(int)(retry_interval * 1000), &mc);
2490
if(debug){
2491
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2492
(ret == 0) ? "successfully" : "with error");
2493
}
1275
2494
1276
2495
end:
1277
2496
1278
2497
if(debug){
1279
fprintf(stderr, "%s exiting\n", argv[0]);
2498
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1280
2499
}
1281
2500
1282
2501
/* Cleanup things */
2502
free(mc.interfaces);
2503
1283
2504
if(sb != NULL)
1284
2505
avahi_s_service_browser_free(sb);
1285
2506
1286
2507
if(mc.server != NULL)
1287
2508
avahi_server_free(mc.server);
1288
2509
1289
if(mc.simple_poll != NULL)
1290
avahi_simple_poll_free(mc.simple_poll);
2510
if(simple_poll != NULL)
2511
avahi_simple_poll_free(simple_poll);
1291
2512
1292
2513
if(gnutls_initialized){
1293
2514
gnutls_certificate_free_credentials(mc.cred);
1299
2520
gpgme_release(mc.ctx);
1300
2521
}
1301
2522
1302
/* Removes the temp directory used by GPGME */
1303
if(tempdir_created){
1304
DIR *d;
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1307
if(d == NULL){
1308
if(errno != ENOENT){
1309
perror("opendir");
2523
/* Cleans up the circular linked list of Mandos servers the client
2524
has seen */
2525
if(mc.current_server != NULL){
2526
mc.current_server->prev->next = NULL;
2527
while(mc.current_server != NULL){
2528
server *next = mc.current_server->next;
2529
free(mc.current_server);
2530
mc.current_server = next;
2531
}
2532
}
2533
2534
/* Re-raise privileges */
2535
{
2536
ret_errno = raise_privileges();
2537
if(ret_errno != 0){
2538
perror_plus("Failed to raise privileges");
2539
} else {
2540
2541
/* Run network hooks */
2542
run_network_hooks("stop", interfaces_hooks != NULL ?
2543
interfaces_hooks : "", delay);
2544
2545
/* Take down the network interfaces which were brought up */
2546
{
2547
char *interface = NULL;
2548
while((interface=argz_next(interfaces_to_take_down,
2549
interfaces_to_take_down_size,
2550
interface))){
2551
ret_errno = take_down_interface(interface);
2552
if(ret_errno != 0){
2553
errno = ret_errno;
2554
perror_plus("Failed to take down interface");
2555
}
2556
}
2557
if(debug and (interfaces_to_take_down == NULL)){
2558
fprintf_plus(stderr, "No interfaces needed to be taken"
2559
" down\n");
2560
}
1310
2561
}
1311
} else {
1312
while(true){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1315
break;
1316
}
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1322
continue;
1323
}
2562
}
2563
ret_errno = lower_privileges_permanently();
2564
if(ret_errno != 0){
2565
perror_plus("Failed to lower privileges permanently");
2566
}
2567
}
2568
2569
free(interfaces_to_take_down);
2570
free(interfaces_hooks);
2571
2572
/* Removes the GPGME temp directory and all files inside */
2573
if(tempdir != NULL){
2574
struct dirent **direntries = NULL;
2575
struct dirent *direntry = NULL;
2576
int numentries = scandir(tempdir, &direntries, notdotentries,
2577
alphasort);
2578
if(numentries > 0){
2579
for(int i = 0; i < numentries; i++){
2580
direntry = direntries[i];
1324
2581
char *fullname = NULL;
1325
2582
ret = asprintf(&fullname, "%s/%s", tempdir,
1326
2583
direntry->d_name);
1327
2584
if(ret < 0){
1328
perror("asprintf");
2585
perror_plus("asprintf");
1329
2586
continue;
1330
2587
}
1331
2588
ret = remove(fullname);
1332
2589
if(ret == -1){
1333
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1334
strerror(errno));
2590
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2591
strerror(errno));
1335
2592
}
1336
2593
free(fullname);
1337
2594
}
1338
closedir(d);
2595
}
2596
2597
/* need to clean even if 0 because man page doesn't specify */
2598
free(direntries);
2599
if(numentries == -1){
2600
perror_plus("scandir");
1339
2601
}
1340
2602
ret = rmdir(tempdir);
1341
2603
if(ret == -1 and errno != ENOENT){
1342
perror("rmdir");
1343
}
2604
perror_plus("rmdir");
2605
}
2606
}
2607
2608
if(quit_now){
2609
sigemptyset(&old_sigterm_action.sa_mask);
2610
old_sigterm_action.sa_handler = SIG_DFL;
2611
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2612
&old_sigterm_action,
2613
NULL));
2614
if(ret == -1){
2615
perror_plus("sigaction");
2616
}
2617
do {
2618
ret = raise(signal_received);
2619
} while(ret != 0 and errno == EINTR);
2620
if(ret != 0){
2621
perror_plus("raise");
2622
abort();
2623
}
2624
TEMP_FAILURE_RETRY(pause());
1344
2625
}
1345
2626
1346
2627
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0