To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 742
- compare with another revision
- download diff
- download tarball
- view history from revision 742
- Committer: Teddy Hogeborn
- Date: 2015-03-10 18:03:38 UTC
- Revision ID: teddy@recompile.se-20150310180338-pcxw6r2qmw9k6br9
Add ":!RSA" to GnuTLS priority string, to disallow non-DHE kx.
If Mandos was somehow made to use a non-ephemeral Diffie-Hellman key
exchange algorithm in the TLS handshake, any saved network traffic
could then be decrypted later if the Mandos client key was obtained.
By default, Mandos uses ephemeral DH key exchanges which does not have
this problem, but a non-ephemeral key exchange algorithm was still
enabled by default. The simplest solution is to simply turn that off,
which ensures that Mandos will always use ephemeral DH key exchanges.
There is a "PFS" priority string specifier, but we can't use it because:
1. Security-wise, it is a mix between "NORMAL" and "SECURE128" - it
enables a lot more algorithms than "SECURE256".
2. It is only available since GnuTLS 3.2.4.
Thanks to Andreas Fischer <af@bantuX.org> for reporting this issue.
If Mandos was somehow made to use a non-ephemeral Diffie-Hellman key
exchange algorithm in the TLS handshake, any saved network traffic
could then be decrypted later if the Mandos client key was obtained.
By default, Mandos uses ephemeral DH key exchanges which does not have
this problem, but a non-ephemeral key exchange algorithm was still
enabled by default. The simplest solution is to simply turn that off,
which ensures that Mandos will always use ephemeral DH key exchanges.
There is a "PFS" priority string specifier, but we can't use it because:
1. Security-wise, it is a mix between "NORMAL" and "SECURE128" - it
enables a lot more algorithms than "SECURE256".
2. It is only available since GnuTLS 3.2.4.
Thanks to Andreas Fischer <af@bantuX.org> for reporting this issue.
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
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() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
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
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
77
79
#include <iso646.h> /* not, or, and */
78
80
#include <argp.h> /* struct argp_option, error_t, struct
79
81
argp_state, struct argp,
80
82
argp_parse(), ARGP_KEY_ARG,
81
83
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
84
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
85
sigaction(), SIGTERM, sig_atomic_t,
86
raise() */
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
85
98
86
99
#ifdef __linux__
87
100
#include <sys/klog.h> /* klogctl() */
105
118
init_gnutls_session(),
106
119
GNUTLS_* */
107
120
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
110
123
111
124
/* GPGME */
112
125
#include <gpgme.h> /* All GPGME types, constants and
120
133
#define PATHDIR "/conf/conf.d/mandos"
121
134
#define SECKEY "seckey.txt"
122
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
123
137
124
138
bool debug = false;
125
139
static const char mandos_protocol_version[] = "1";
126
140
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
151
const char *ip;
152
in_port_t port;
153
AvahiIfIndex if_index;
154
int af;
155
struct timespec last_seen;
156
struct server *next;
157
struct server *prev;
158
} server;
128
159
129
160
/* Used for passing in values through the Avahi callback functions */
130
161
typedef struct {
131
AvahiSimplePoll *simple_poll;
132
162
AvahiServer *server;
133
163
gnutls_certificate_credentials_t cred;
134
164
unsigned int dh_bits;
135
165
gnutls_dh_params_t dh_params;
136
166
const char *priority;
137
167
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
138
171
} mandos_context;
139
172
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" };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
175
176
sig_atomic_t quit_now = 0;
177
int signal_received = 0;
178
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
181
int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
184
errno = e;
185
perror(print_text);
186
}
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
144
197
145
198
/*
146
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
200
* bytes. "buffer_capacity" is how much is currently allocated,
148
201
* "buffer_length" is how much is already used.
149
202
*/
203
__attribute__((nonnull, warn_unused_result))
150
204
size_t incbuffer(char **buffer, size_t buffer_length,
151
size_t buffer_capacity){
205
size_t buffer_capacity){
152
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
155
213
return 0;
156
214
}
215
*buffer = new_buf;
157
216
buffer_capacity += BUFFER_SIZE;
158
217
}
159
218
return buffer_capacity;
160
219
}
161
220
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
229
return false;
230
}
231
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
253
}
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
259
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
267
}
268
162
269
/*
163
270
* Initialize GPGME.
164
271
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
168
277
gpgme_error_t rc;
169
278
gpgme_engine_info_t engine_info;
170
279
171
172
280
/*
173
281
* Helper function to insert pub and seckey to the engine keyring.
174
282
*/
175
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
284
int ret;
176
285
int fd;
177
286
gpgme_data_t pgp_data;
178
287
179
288
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
289
if(fd == -1){
181
perror("open");
290
perror_plus("open");
182
291
return false;
183
292
}
184
293
185
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
295
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));
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
189
298
return false;
190
299
}
191
300
192
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
193
302
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
196
305
return false;
197
306
}
198
307
199
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
200
309
if(ret == -1){
201
perror("close");
310
perror_plus("close");
202
311
}
203
312
gpgme_data_release(pgp_data);
204
313
return true;
205
314
}
206
315
207
316
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
317
fprintf_plus(stderr, "Initializing GPGME\n");
209
318
}
210
319
211
320
/* Init GPGME */
212
321
gpgme_check_version(NULL);
213
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
323
if(rc != GPG_ERR_NO_ERROR){
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
217
326
return false;
218
327
}
219
328
220
/* Set GPGME home directory for the OpenPGP engine only */
329
/* Set GPGME home directory for the OpenPGP engine only */
221
330
rc = gpgme_get_engine_info(&engine_info);
222
331
if(rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
225
334
return false;
226
335
}
227
336
while(engine_info != NULL){
233
342
engine_info = engine_info->next;
234
343
}
235
344
if(engine_info == NULL){
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
237
347
return false;
238
348
}
239
349
240
350
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
242
352
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
245
356
return false;
246
357
}
247
358
249
360
return false;
250
361
}
251
362
252
return true;
363
return true;
253
364
}
254
365
255
366
/*
256
367
* Decrypt OpenPGP data.
257
368
* Returns -1 on error
258
369
*/
370
__attribute__((nonnull, warn_unused_result))
259
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
372
size_t crypto_size,
261
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
262
375
gpgme_data_t dh_crypto, dh_plain;
263
376
gpgme_error_t rc;
264
377
ssize_t ret;
266
379
ssize_t plaintext_length = 0;
267
380
268
381
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
270
383
}
271
384
272
385
/* Create new GPGME data buffer from memory cryptotext */
273
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
387
0);
275
388
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));
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
278
391
return -1;
279
392
}
280
393
281
394
/* Create new empty GPGME data buffer for the plaintext */
282
395
rc = gpgme_data_new(&dh_plain);
283
396
if(rc != GPG_ERR_NO_ERROR){
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
286
400
gpgme_data_release(dh_crypto);
287
401
return -1;
288
402
}
289
403
290
404
/* Decrypt data from the cryptotext data buffer to the plaintext
291
405
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
293
407
if(rc != GPG_ERR_NO_ERROR){
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
296
410
plaintext_length = -1;
297
411
if(debug){
298
412
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
300
414
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
302
416
} 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);
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
307
421
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
309
423
}
310
424
gpgme_recipient_t recipient;
311
425
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
}
426
while(recipient != NULL){
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
434
recipient = recipient->next;
322
435
}
323
436
}
324
437
}
326
439
}
327
440
328
441
if(debug){
329
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
330
443
}
331
444
332
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
333
446
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
334
perror("gpgme_data_seek");
447
perror_plus("gpgme_data_seek");
335
448
plaintext_length = -1;
336
449
goto decrypt_end;
337
450
}
339
452
*plaintext = NULL;
340
453
while(true){
341
454
plaintext_capacity = incbuffer(plaintext,
342
(size_t)plaintext_length,
343
plaintext_capacity);
455
(size_t)plaintext_length,
456
plaintext_capacity);
344
457
if(plaintext_capacity == 0){
345
perror("incbuffer");
346
plaintext_length = -1;
347
goto decrypt_end;
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
348
461
}
349
462
350
463
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
355
468
break;
356
469
}
357
470
if(ret < 0){
358
perror("gpgme_data_read");
471
perror_plus("gpgme_data_read");
359
472
plaintext_length = -1;
360
473
goto decrypt_end;
361
474
}
363
476
}
364
477
365
478
if(debug){
366
fprintf(stderr, "Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
367
480
for(ssize_t i = 0; i < plaintext_length; i++){
368
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
369
482
}
380
493
return plaintext_length;
381
494
}
382
495
383
static const char * safer_gnutls_strerror(int value){
384
const char *ret = gnutls_strerror(value); /* Spurious warning from
385
-Wunreachable-code */
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
386
499
if(ret == NULL)
387
500
ret = "(unknown)";
388
501
return ret;
389
502
}
390
503
391
504
/* GnuTLS log function callback */
505
__attribute__((nonnull))
392
506
static void debuggnutls(__attribute__((unused)) int level,
393
507
const char* string){
394
fprintf(stderr, "GnuTLS: %s", string);
508
fprintf_plus(stderr, "GnuTLS: %s", string);
395
509
}
396
510
511
__attribute__((nonnull, warn_unused_result))
397
512
static int init_gnutls_global(const char *pubkeyfilename,
398
const char *seckeyfilename){
513
const char *seckeyfilename,
514
mandos_context *mc){
399
515
int ret;
400
516
401
517
if(debug){
402
fprintf(stderr, "Initializing GnuTLS\n");
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
403
519
}
404
520
405
521
ret = gnutls_global_init();
406
522
if(ret != GNUTLS_E_SUCCESS){
407
fprintf(stderr, "GnuTLS global_init: %s\n",
408
safer_gnutls_strerror(ret));
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
409
525
return -1;
410
526
}
411
527
418
534
}
419
535
420
536
/* OpenPGP credentials */
421
gnutls_certificate_allocate_credentials(&mc.cred);
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
422
538
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));
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
428
541
gnutls_global_deinit();
429
542
return -1;
430
543
}
431
544
432
545
if(debug){
433
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
434
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
435
seckeyfilename);
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
548
pubkeyfilename,
549
seckeyfilename);
436
550
}
437
551
438
552
ret = gnutls_certificate_set_openpgp_key_file
439
(mc.cred, pubkeyfilename, seckeyfilename,
553
(mc->cred, pubkeyfilename, seckeyfilename,
440
554
GNUTLS_OPENPGP_FMT_BASE64);
441
555
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));
556
fprintf_plus(stderr,
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
558
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
559
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
safer_gnutls_strerror(ret));
447
561
goto globalfail;
448
562
}
449
563
450
564
/* GnuTLS server initialization */
451
ret = gnutls_dh_params_init(&mc.dh_params);
565
ret = gnutls_dh_params_init(&mc->dh_params);
452
566
if(ret != GNUTLS_E_SUCCESS){
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
454
" %s\n", safer_gnutls_strerror(ret));
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
455
570
goto globalfail;
456
571
}
457
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
458
573
if(ret != GNUTLS_E_SUCCESS){
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
460
safer_gnutls_strerror(ret));
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
461
576
goto globalfail;
462
577
}
463
578
464
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
465
580
466
581
return 0;
467
582
468
583
globalfail:
469
584
470
gnutls_certificate_free_credentials(mc.cred);
585
gnutls_certificate_free_credentials(mc->cred);
471
586
gnutls_global_deinit();
472
gnutls_dh_params_deinit(mc.dh_params);
587
gnutls_dh_params_deinit(mc->dh_params);
473
588
return -1;
474
589
}
475
590
476
static int init_gnutls_session(gnutls_session_t *session){
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
477
594
int ret;
478
595
/* GnuTLS session creation */
479
ret = gnutls_init(session, GNUTLS_SERVER);
596
do {
597
ret = gnutls_init(session, GNUTLS_SERVER);
598
if(quit_now){
599
return -1;
600
}
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
480
602
if(ret != GNUTLS_E_SUCCESS){
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
603
fprintf_plus(stderr,
604
"Error in GnuTLS session initialization: %s\n",
605
safer_gnutls_strerror(ret));
483
606
}
484
607
485
608
{
486
609
const char *err;
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
610
do {
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
612
if(quit_now){
613
gnutls_deinit(*session);
614
return -1;
615
}
616
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
617
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));
618
fprintf_plus(stderr, "Syntax error at: %s\n", err);
619
fprintf_plus(stderr, "GnuTLS error: %s\n",
620
safer_gnutls_strerror(ret));
492
621
gnutls_deinit(*session);
493
622
return -1;
494
623
}
495
624
}
496
625
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
626
do {
627
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
628
mc->cred);
629
if(quit_now){
630
gnutls_deinit(*session);
631
return -1;
632
}
633
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
499
634
if(ret != GNUTLS_E_SUCCESS){
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
501
safer_gnutls_strerror(ret));
635
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
636
safer_gnutls_strerror(ret));
502
637
gnutls_deinit(*session);
503
638
return -1;
504
639
}
505
640
506
641
/* ignore client certificate if any. */
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
509
643
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
511
645
512
646
return 0;
513
647
}
517
651
__attribute__((unused)) const char *txt){}
518
652
519
653
/* Called when a Mandos server is found */
520
static int start_mandos_communication(const char *ip, uint16_t port,
654
__attribute__((nonnull, warn_unused_result))
655
static int start_mandos_communication(const char *ip, in_port_t port,
521
656
AvahiIfIndex if_index,
522
int af){
523
int ret, tcp_sd;
657
int af, mandos_context *mc){
658
int ret, tcp_sd = -1;
524
659
ssize_t sret;
525
union {
526
struct sockaddr_in in;
527
struct sockaddr_in6 in6;
528
} to;
660
struct sockaddr_storage to;
529
661
char *buffer = NULL;
530
char *decrypted_buffer;
662
char *decrypted_buffer = NULL;
531
663
size_t buffer_length = 0;
532
664
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
534
665
size_t written;
535
int retval = 0;
666
int retval = -1;
536
667
gnutls_session_t session;
537
668
int pf; /* Protocol family */
538
669
670
errno = 0;
671
672
if(quit_now){
673
errno = EINTR;
674
return -1;
675
}
676
539
677
switch(af){
540
678
case AF_INET6:
541
679
pf = PF_INET6;
544
682
pf = PF_INET;
545
683
break;
546
684
default:
547
fprintf(stderr, "Bad address family: %d\n", af);
685
fprintf_plus(stderr, "Bad address family: %d\n", af);
686
errno = EINVAL;
548
687
return -1;
549
688
}
550
689
551
ret = init_gnutls_session(&session);
690
/* If the interface is specified and we have a list of interfaces */
691
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
692
/* Check if the interface is one of the interfaces we are using */
693
bool match = false;
694
{
695
char *interface = NULL;
696
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
697
interface))){
698
if(if_nametoindex(interface) == (unsigned int)if_index){
699
match = true;
700
break;
701
}
702
}
703
}
704
if(not match){
705
/* This interface does not match any in the list, so we don't
706
connect to the server */
707
if(debug){
708
char interface[IF_NAMESIZE];
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
711
} else {
712
fprintf_plus(stderr, "Skipping server on non-used interface"
713
" \"%s\"\n",
714
if_indextoname((unsigned int)if_index,
715
interface));
716
}
717
}
718
return -1;
719
}
720
}
721
722
ret = init_gnutls_session(&session, mc);
552
723
if(ret != 0){
553
724
return -1;
554
725
}
555
726
556
727
if(debug){
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
558
"\n", ip, port);
728
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
729
PRIuMAX "\n", ip, (uintmax_t)port);
559
730
}
560
731
561
732
tcp_sd = socket(pf, SOCK_STREAM, 0);
562
733
if(tcp_sd < 0){
563
perror("socket");
564
return -1;
734
int e = errno;
735
perror_plus("socket");
736
errno = e;
737
goto mandos_end;
738
}
739
740
if(quit_now){
741
errno = EINTR;
742
goto mandos_end;
565
743
}
566
744
567
745
memset(&to, 0, sizeof(to));
568
746
if(af == AF_INET6){
569
to.in6.sin6_family = (sa_family_t)af;
570
ret = inet_pton(af, ip, &to.in6.sin6_addr);
747
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
748
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
571
749
} else { /* IPv4 */
572
to.in.sin_family = (sa_family_t)af;
573
ret = inet_pton(af, ip, &to.in.sin_addr);
750
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
751
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
574
752
}
575
753
if(ret < 0 ){
576
perror("inet_pton");
577
return -1;
754
int e = errno;
755
perror_plus("inet_pton");
756
errno = e;
757
goto mandos_end;
578
758
}
579
759
if(ret == 0){
580
fprintf(stderr, "Bad address: %s\n", ip);
581
return -1;
760
int e = errno;
761
fprintf_plus(stderr, "Bad address: %s\n", ip);
762
errno = e;
763
goto mandos_end;
582
764
}
583
765
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*/
766
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
767
if(IN6_IS_ADDR_LINKLOCAL
768
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
591
769
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;
770
fprintf_plus(stderr, "An IPv6 link-local address is"
771
" incomplete without a network interface\n");
772
errno = EINVAL;
773
goto mandos_end;
595
774
}
596
775
/* Set the network interface number as scope */
597
to.in6.sin6_scope_id = (uint32_t)if_index;
776
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
598
777
}
599
778
} else {
600
to.in.sin_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
779
((struct sockaddr_in *)&to)->sin_port = htons(port);
780
}
781
782
if(quit_now){
783
errno = EINTR;
784
goto mandos_end;
603
785
}
604
786
605
787
if(debug){
606
788
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
607
789
char interface[IF_NAMESIZE];
608
790
if(if_indextoname((unsigned int)if_index, interface) == NULL){
609
perror("if_indextoname");
791
perror_plus("if_indextoname");
610
792
} else {
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
612
ip, interface, port);
793
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
794
"\n", ip, interface, (uintmax_t)port);
613
795
}
614
796
} else {
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
616
port);
797
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
798
ip, (uintmax_t)port);
617
799
}
618
800
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
619
801
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
620
const char *pcret;
621
802
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
}
803
ret = getnameinfo((struct sockaddr *)&to,
804
sizeof(struct sockaddr_in6),
805
addrstr, sizeof(addrstr), NULL, 0,
806
NI_NUMERICHOST);
807
} else {
808
ret = getnameinfo((struct sockaddr *)&to,
809
sizeof(struct sockaddr_in),
810
addrstr, sizeof(addrstr), NULL, 0,
811
NI_NUMERICHOST);
812
}
813
if(ret == EAI_SYSTEM){
814
perror_plus("getnameinfo");
815
} else if(ret != 0) {
816
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
817
} else if(strcmp(addrstr, ip) != 0){
818
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
819
}
820
}
821
822
if(quit_now){
823
errno = EINTR;
824
goto mandos_end;
635
825
}
636
826
637
827
if(af == AF_INET6){
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
828
ret = connect(tcp_sd, (struct sockaddr *)&to,
829
sizeof(struct sockaddr_in6));
639
830
} else {
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
831
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
832
sizeof(struct sockaddr_in));
641
833
}
642
834
if(ret < 0){
643
perror("connect");
644
return -1;
835
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
836
int e = errno;
837
perror_plus("connect");
838
errno = e;
839
}
840
goto mandos_end;
841
}
842
843
if(quit_now){
844
errno = EINTR;
845
goto mandos_end;
645
846
}
646
847
647
848
const char *out = mandos_protocol_version;
649
850
while(true){
650
851
size_t out_size = strlen(out);
651
852
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
652
out_size - written));
853
out_size - written));
653
854
if(ret == -1){
654
perror("write");
655
retval = -1;
855
int e = errno;
856
perror_plus("write");
857
errno = e;
656
858
goto mandos_end;
657
859
}
658
860
written += (size_t)ret;
666
868
break;
667
869
}
668
870
}
871
872
if(quit_now){
873
errno = EINTR;
874
goto mandos_end;
875
}
669
876
}
670
877
671
878
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{
879
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
880
}
881
882
if(quit_now){
883
errno = EINTR;
884
goto mandos_end;
885
}
886
887
/* This casting via intptr_t is to eliminate warning about casting
888
an int to a pointer type. This is exactly how the GnuTLS Guile
889
function "set-session-transport-fd!" does it. */
890
gnutls_transport_set_ptr(session,
891
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
892
893
if(quit_now){
894
errno = EINTR;
895
goto mandos_end;
896
}
897
898
do {
678
899
ret = gnutls_handshake(session);
900
if(quit_now){
901
errno = EINTR;
902
goto mandos_end;
903
}
679
904
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
680
905
681
906
if(ret != GNUTLS_E_SUCCESS){
682
907
if(debug){
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
908
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
684
909
gnutls_perror(ret);
685
910
}
686
retval = -1;
911
errno = EPROTO;
687
912
goto mandos_end;
688
913
}
689
914
690
915
/* Read OpenPGP packet that contains the wanted password */
691
916
692
917
if(debug){
693
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
694
ip);
918
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
919
" %s\n", ip);
695
920
}
696
921
697
922
while(true){
923
924
if(quit_now){
925
errno = EINTR;
926
goto mandos_end;
927
}
928
698
929
buffer_capacity = incbuffer(&buffer, buffer_length,
699
buffer_capacity);
930
buffer_capacity);
700
931
if(buffer_capacity == 0){
701
perror("incbuffer");
702
retval = -1;
932
int e = errno;
933
perror_plus("incbuffer");
934
errno = e;
935
goto mandos_end;
936
}
937
938
if(quit_now){
939
errno = EINTR;
703
940
goto mandos_end;
704
941
}
705
942
714
951
case GNUTLS_E_AGAIN:
715
952
break;
716
953
case GNUTLS_E_REHANDSHAKE:
717
do{
954
do {
718
955
ret = gnutls_handshake(session);
956
957
if(quit_now){
958
errno = EINTR;
959
goto mandos_end;
960
}
719
961
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
720
962
if(ret < 0){
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
963
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
964
"***\n");
722
965
gnutls_perror(ret);
723
retval = -1;
966
errno = EPROTO;
724
967
goto mandos_end;
725
968
}
726
969
break;
727
970
default:
728
fprintf(stderr, "Unknown error while reading data from"
729
" encrypted session with Mandos server\n");
730
retval = -1;
971
fprintf_plus(stderr, "Unknown error while reading data from"
972
" encrypted session with Mandos server\n");
731
973
gnutls_bye(session, GNUTLS_SHUT_RDWR);
974
errno = EIO;
732
975
goto mandos_end;
733
976
}
734
977
} else {
737
980
}
738
981
739
982
if(debug){
740
fprintf(stderr, "Closing TLS session\n");
741
}
742
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
983
fprintf_plus(stderr, "Closing TLS session\n");
984
}
985
986
if(quit_now){
987
errno = EINTR;
988
goto mandos_end;
989
}
990
991
do {
992
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
993
if(quit_now){
994
errno = EINTR;
995
goto mandos_end;
996
}
997
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
744
998
745
999
if(buffer_length > 0){
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
747
buffer_length,
748
&decrypted_buffer);
1000
ssize_t decrypted_buffer_size;
1001
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1002
&decrypted_buffer, mc);
749
1003
if(decrypted_buffer_size >= 0){
1004
750
1005
written = 0;
751
1006
while(written < (size_t) decrypted_buffer_size){
1007
if(quit_now){
1008
errno = EINTR;
1009
goto mandos_end;
1010
}
1011
752
1012
ret = (int)fwrite(decrypted_buffer + written, 1,
753
1013
(size_t)decrypted_buffer_size - written,
754
1014
stdout);
755
1015
if(ret == 0 and ferror(stdout)){
1016
int e = errno;
756
1017
if(debug){
757
fprintf(stderr, "Error writing encrypted data: %s\n",
758
strerror(errno));
1018
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1019
strerror(errno));
759
1020
}
760
retval = -1;
761
break;
1021
errno = e;
1022
goto mandos_end;
762
1023
}
763
1024
written += (size_t)ret;
764
1025
}
765
free(decrypted_buffer);
766
} else {
767
retval = -1;
1026
retval = 0;
768
1027
}
769
} else {
770
retval = -1;
771
1028
}
772
1029
773
1030
/* Shutdown procedure */
774
1031
775
1032
mandos_end:
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
1033
{
1034
int e = errno;
1035
free(decrypted_buffer);
1036
free(buffer);
1037
if(tcp_sd >= 0){
1038
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1039
}
1040
if(ret == -1){
1041
if(e == 0){
1042
e = errno;
1043
}
1044
perror_plus("close");
1045
}
1046
gnutls_deinit(session);
1047
errno = e;
1048
if(quit_now){
1049
errno = EINTR;
1050
retval = -1;
1051
}
780
1052
}
781
gnutls_deinit(session);
782
1053
return retval;
783
1054
}
784
1055
1056
__attribute__((nonnull))
785
1057
static void resolve_callback(AvahiSServiceResolver *r,
786
1058
AvahiIfIndex interface,
787
1059
AvahiProtocol proto,
795
1067
AVAHI_GCC_UNUSED AvahiStringList *txt,
796
1068
AVAHI_GCC_UNUSED AvahiLookupResultFlags
797
1069
flags,
798
AVAHI_GCC_UNUSED void* userdata){
799
assert(r);
1070
void *mc){
1071
if(r == NULL){
1072
return;
1073
}
800
1074
801
1075
/* Called whenever a service has been resolved successfully or
802
1076
timed out */
803
1077
1078
if(quit_now){
1079
avahi_s_service_resolver_free(r);
1080
return;
1081
}
1082
804
1083
switch(event){
805
1084
default:
806
1085
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)));
1086
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1087
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1088
domain,
1089
avahi_strerror(avahi_server_errno
1090
(((mandos_context*)mc)->server)));
810
1091
break;
811
1092
812
1093
case AVAHI_RESOLVER_FOUND:
814
1095
char ip[AVAHI_ADDRESS_STR_MAX];
815
1096
avahi_address_snprint(ip, sizeof(ip), address);
816
1097
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);
1098
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1099
PRIdMAX ") on port %" PRIu16 "\n", name,
1100
host_name, ip, (intmax_t)interface, port);
820
1101
}
821
int ret = start_mandos_communication(ip, port, interface,
822
avahi_proto_to_af(proto));
1102
int ret = start_mandos_communication(ip, (in_port_t)port,
1103
interface,
1104
avahi_proto_to_af(proto),
1105
mc);
823
1106
if(ret == 0){
824
avahi_simple_poll_quit(mc.simple_poll);
1107
avahi_simple_poll_quit(simple_poll);
1108
} else {
1109
if(not add_server(ip, (in_port_t)port, interface,
1110
avahi_proto_to_af(proto),
1111
&((mandos_context*)mc)->current_server)){
1112
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1113
" list\n", name);
1114
}
825
1115
}
826
1116
}
827
1117
}
837
1127
const char *domain,
838
1128
AVAHI_GCC_UNUSED AvahiLookupResultFlags
839
1129
flags,
840
AVAHI_GCC_UNUSED void* userdata){
841
assert(b);
1130
void *mc){
1131
if(b == NULL){
1132
return;
1133
}
842
1134
843
1135
/* Called whenever a new services becomes available on the LAN or
844
1136
is removed from the LAN */
845
1137
1138
if(quit_now){
1139
return;
1140
}
1141
846
1142
switch(event){
847
1143
default:
848
1144
case AVAHI_BROWSER_FAILURE:
849
1145
850
fprintf(stderr, "(Avahi browser) %s\n",
851
avahi_strerror(avahi_server_errno(mc.server)));
852
avahi_simple_poll_quit(mc.simple_poll);
1146
fprintf_plus(stderr, "(Avahi browser) %s\n",
1147
avahi_strerror(avahi_server_errno
1148
(((mandos_context*)mc)->server)));
1149
avahi_simple_poll_quit(simple_poll);
853
1150
return;
854
1151
855
1152
case AVAHI_BROWSER_NEW:
858
1155
the callback function is called the Avahi server will free the
859
1156
resolver for us. */
860
1157
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)));
1158
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1159
interface, protocol, name, type,
1160
domain, protocol, 0,
1161
resolve_callback, mc) == NULL)
1162
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1163
" %s\n", name,
1164
avahi_strerror(avahi_server_errno
1165
(((mandos_context*)mc)->server)));
866
1166
break;
867
1167
868
1168
case AVAHI_BROWSER_REMOVE:
871
1171
case AVAHI_BROWSER_ALL_FOR_NOW:
872
1172
case AVAHI_BROWSER_CACHE_EXHAUSTED:
873
1173
if(debug){
874
fprintf(stderr, "No Mandos server found, still searching...\n");
1174
fprintf_plus(stderr, "No Mandos server found, still"
1175
" searching...\n");
875
1176
}
876
1177
break;
877
1178
}
878
1179
}
879
1180
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){
1181
/* Signal handler that stops main loop after SIGTERM */
1182
static void handle_sigterm(int sig){
884
1183
if(quit_now){
885
1184
return;
886
1185
}
887
1186
quit_now = 1;
1187
signal_received = sig;
888
1188
int old_errno = errno;
889
if(mc.simple_poll != NULL){
890
avahi_simple_poll_quit(mc.simple_poll);
891
}
892
errno = old_errno;
1189
/* set main loop to exit */
1190
if(simple_poll != NULL){
1191
avahi_simple_poll_quit(simple_poll);
1192
}
1193
errno = old_errno;
1194
}
1195
1196
__attribute__((nonnull, warn_unused_result))
1197
bool get_flags(const char *ifname, struct ifreq *ifr){
1198
int ret;
1199
error_t ret_errno;
1200
1201
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1202
if(s < 0){
1203
ret_errno = errno;
1204
perror_plus("socket");
1205
errno = ret_errno;
1206
return false;
1207
}
1208
strcpy(ifr->ifr_name, ifname);
1209
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1210
if(ret == -1){
1211
if(debug){
1212
ret_errno = errno;
1213
perror_plus("ioctl SIOCGIFFLAGS");
1214
errno = ret_errno;
1215
}
1216
return false;
1217
}
1218
return true;
1219
}
1220
1221
__attribute__((nonnull, warn_unused_result))
1222
bool good_flags(const char *ifname, const struct ifreq *ifr){
1223
1224
/* Reject the loopback device */
1225
if(ifr->ifr_flags & IFF_LOOPBACK){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1228
ifname);
1229
}
1230
return false;
1231
}
1232
/* Accept point-to-point devices only if connect_to is specified */
1233
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1234
if(debug){
1235
fprintf_plus(stderr, "Accepting point-to-point interface"
1236
" \"%s\"\n", ifname);
1237
}
1238
return true;
1239
}
1240
/* Otherwise, reject non-broadcast-capable devices */
1241
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1242
if(debug){
1243
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1244
" \"%s\"\n", ifname);
1245
}
1246
return false;
1247
}
1248
/* Reject non-ARP interfaces (including dummy interfaces) */
1249
if(ifr->ifr_flags & IFF_NOARP){
1250
if(debug){
1251
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1252
ifname);
1253
}
1254
return false;
1255
}
1256
1257
/* Accept this device */
1258
if(debug){
1259
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1260
}
1261
return true;
1262
}
1263
1264
/*
1265
* This function determines if a directory entry in /sys/class/net
1266
* corresponds to an acceptable network device.
1267
* (This function is passed to scandir(3) as a filter function.)
1268
*/
1269
__attribute__((nonnull, warn_unused_result))
1270
int good_interface(const struct dirent *if_entry){
1271
if(if_entry->d_name[0] == '.'){
1272
return 0;
1273
}
1274
1275
struct ifreq ifr;
1276
if(not get_flags(if_entry->d_name, &ifr)){
1277
if(debug){
1278
fprintf_plus(stderr, "Failed to get flags for interface "
1279
"\"%s\"\n", if_entry->d_name);
1280
}
1281
return 0;
1282
}
1283
1284
if(not good_flags(if_entry->d_name, &ifr)){
1285
return 0;
1286
}
1287
return 1;
1288
}
1289
1290
/*
1291
* This function determines if a network interface is up.
1292
*/
1293
__attribute__((nonnull, warn_unused_result))
1294
bool interface_is_up(const char *interface){
1295
struct ifreq ifr;
1296
if(not get_flags(interface, &ifr)){
1297
if(debug){
1298
fprintf_plus(stderr, "Failed to get flags for interface "
1299
"\"%s\"\n", interface);
1300
}
1301
return false;
1302
}
1303
1304
return (bool)(ifr.ifr_flags & IFF_UP);
1305
}
1306
1307
/*
1308
* This function determines if a network interface is running
1309
*/
1310
__attribute__((nonnull, warn_unused_result))
1311
bool interface_is_running(const char *interface){
1312
struct ifreq ifr;
1313
if(not get_flags(interface, &ifr)){
1314
if(debug){
1315
fprintf_plus(stderr, "Failed to get flags for interface "
1316
"\"%s\"\n", interface);
1317
}
1318
return false;
1319
}
1320
1321
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1322
}
1323
1324
__attribute__((nonnull, pure, warn_unused_result))
1325
int notdotentries(const struct dirent *direntry){
1326
/* Skip "." and ".." */
1327
if(direntry->d_name[0] == '.'
1328
and (direntry->d_name[1] == '\0'
1329
or (direntry->d_name[1] == '.'
1330
and direntry->d_name[2] == '\0'))){
1331
return 0;
1332
}
1333
return 1;
1334
}
1335
1336
/* Is this directory entry a runnable program? */
1337
__attribute__((nonnull, warn_unused_result))
1338
int runnable_hook(const struct dirent *direntry){
1339
int ret;
1340
size_t sret;
1341
struct stat st;
1342
1343
if((direntry->d_name)[0] == '\0'){
1344
/* Empty name? */
1345
return 0;
1346
}
1347
1348
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1349
"abcdefghijklmnopqrstuvwxyz"
1350
"0123456789"
1351
"_.-");
1352
if((direntry->d_name)[sret] != '\0'){
1353
/* Contains non-allowed characters */
1354
if(debug){
1355
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1356
direntry->d_name);
1357
}
1358
return 0;
1359
}
1360
1361
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1362
if(ret == -1){
1363
if(debug){
1364
perror_plus("Could not stat hook");
1365
}
1366
return 0;
1367
}
1368
if(not (S_ISREG(st.st_mode))){
1369
/* Not a regular file */
1370
if(debug){
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1372
direntry->d_name);
1373
}
1374
return 0;
1375
}
1376
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1377
/* Not executable */
1378
if(debug){
1379
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1380
direntry->d_name);
1381
}
1382
return 0;
1383
}
1384
if(debug){
1385
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1386
direntry->d_name);
1387
}
1388
return 1;
1389
}
1390
1391
__attribute__((nonnull, warn_unused_result))
1392
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1393
mandos_context *mc){
1394
int ret;
1395
struct timespec now;
1396
struct timespec waited_time;
1397
intmax_t block_time;
1398
1399
while(true){
1400
if(mc->current_server == NULL){
1401
if(debug){
1402
fprintf_plus(stderr, "Wait until first server is found."
1403
" No timeout!\n");
1404
}
1405
ret = avahi_simple_poll_iterate(s, -1);
1406
} else {
1407
if(debug){
1408
fprintf_plus(stderr, "Check current_server if we should run"
1409
" it, or wait\n");
1410
}
1411
/* the current time */
1412
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1413
if(ret == -1){
1414
perror_plus("clock_gettime");
1415
return -1;
1416
}
1417
/* Calculating in ms how long time between now and server
1418
who we visted longest time ago. Now - last seen. */
1419
waited_time.tv_sec = (now.tv_sec
1420
- mc->current_server->last_seen.tv_sec);
1421
waited_time.tv_nsec = (now.tv_nsec
1422
- mc->current_server->last_seen.tv_nsec);
1423
/* total time is 10s/10,000ms.
1424
Converting to s from ms by dividing by 1,000,
1425
and ns to ms by dividing by 1,000,000. */
1426
block_time = ((retry_interval
1427
- ((intmax_t)waited_time.tv_sec * 1000))
1428
- ((intmax_t)waited_time.tv_nsec / 1000000));
1429
1430
if(debug){
1431
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1432
block_time);
1433
}
1434
1435
if(block_time <= 0){
1436
ret = start_mandos_communication(mc->current_server->ip,
1437
mc->current_server->port,
1438
mc->current_server->if_index,
1439
mc->current_server->af, mc);
1440
if(ret == 0){
1441
avahi_simple_poll_quit(s);
1442
return 0;
1443
}
1444
ret = clock_gettime(CLOCK_MONOTONIC,
1445
&mc->current_server->last_seen);
1446
if(ret == -1){
1447
perror_plus("clock_gettime");
1448
return -1;
1449
}
1450
mc->current_server = mc->current_server->next;
1451
block_time = 0; /* Call avahi to find new Mandos
1452
servers, but don't block */
1453
}
1454
1455
ret = avahi_simple_poll_iterate(s, (int)block_time);
1456
}
1457
if(ret != 0){
1458
if(ret > 0 or errno != EINTR){
1459
return (ret != 1) ? ret : 0;
1460
}
1461
}
1462
}
1463
}
1464
1465
/* Set effective uid to 0, return errno */
1466
__attribute__((warn_unused_result))
1467
error_t raise_privileges(void){
1468
error_t old_errno = errno;
1469
error_t ret_errno = 0;
1470
if(seteuid(0) == -1){
1471
ret_errno = errno;
1472
}
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
1477
/* Set effective and real user ID to 0. Return errno. */
1478
__attribute__((warn_unused_result))
1479
error_t raise_privileges_permanently(void){
1480
error_t old_errno = errno;
1481
error_t ret_errno = raise_privileges();
1482
if(ret_errno != 0){
1483
errno = old_errno;
1484
return ret_errno;
1485
}
1486
if(setuid(0) == -1){
1487
ret_errno = errno;
1488
}
1489
errno = old_errno;
1490
return ret_errno;
1491
}
1492
1493
/* Set effective user ID to unprivileged saved user ID */
1494
__attribute__((warn_unused_result))
1495
error_t lower_privileges(void){
1496
error_t old_errno = errno;
1497
error_t ret_errno = 0;
1498
if(seteuid(uid) == -1){
1499
ret_errno = errno;
1500
}
1501
errno = old_errno;
1502
return ret_errno;
1503
}
1504
1505
/* Lower privileges permanently */
1506
__attribute__((warn_unused_result))
1507
error_t lower_privileges_permanently(void){
1508
error_t old_errno = errno;
1509
error_t ret_errno = 0;
1510
if(setuid(uid) == -1){
1511
ret_errno = errno;
1512
}
1513
errno = old_errno;
1514
return ret_errno;
1515
}
1516
1517
__attribute__((nonnull))
1518
void run_network_hooks(const char *mode, const char *interface,
1519
const float delay){
1520
struct dirent **direntries = NULL;
1521
if(hookdir_fd == -1){
1522
hookdir_fd = open(hookdir, O_RDONLY);
1523
if(hookdir_fd == -1){
1524
if(errno == ENOENT){
1525
if(debug){
1526
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1527
" found\n", hookdir);
1528
}
1529
} else {
1530
perror_plus("open");
1531
}
1532
return;
1533
}
1534
}
1535
#ifdef __GLIBC__
1536
#if __GLIBC_PREREQ(2, 15)
1537
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1538
runnable_hook, alphasort);
1539
#else /* not __GLIBC_PREREQ(2, 15) */
1540
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1541
alphasort);
1542
#endif /* not __GLIBC_PREREQ(2, 15) */
1543
#else /* not __GLIBC__ */
1544
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1545
alphasort);
1546
#endif /* not __GLIBC__ */
1547
if(numhooks == -1){
1548
perror_plus("scandir");
1549
return;
1550
}
1551
struct dirent *direntry;
1552
int ret;
1553
int devnull = open("/dev/null", O_RDONLY);
1554
for(int i = 0; i < numhooks; i++){
1555
direntry = direntries[i];
1556
if(debug){
1557
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1558
direntry->d_name);
1559
}
1560
pid_t hook_pid = fork();
1561
if(hook_pid == 0){
1562
/* Child */
1563
/* Raise privileges */
1564
errno = raise_privileges_permanently();
1565
if(errno != 0){
1566
perror_plus("Failed to raise privileges");
1567
_exit(EX_NOPERM);
1568
}
1569
/* Set group */
1570
errno = 0;
1571
ret = setgid(0);
1572
if(ret == -1){
1573
perror_plus("setgid");
1574
_exit(EX_NOPERM);
1575
}
1576
/* Reset supplementary groups */
1577
errno = 0;
1578
ret = setgroups(0, NULL);
1579
if(ret == -1){
1580
perror_plus("setgroups");
1581
_exit(EX_NOPERM);
1582
}
1583
ret = dup2(devnull, STDIN_FILENO);
1584
if(ret == -1){
1585
perror_plus("dup2(devnull, STDIN_FILENO)");
1586
_exit(EX_OSERR);
1587
}
1588
ret = close(devnull);
1589
if(ret == -1){
1590
perror_plus("close");
1591
_exit(EX_OSERR);
1592
}
1593
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1594
if(ret == -1){
1595
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1596
_exit(EX_OSERR);
1597
}
1598
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1599
if(ret == -1){
1600
perror_plus("setenv");
1601
_exit(EX_OSERR);
1602
}
1603
ret = setenv("DEVICE", interface, 1);
1604
if(ret == -1){
1605
perror_plus("setenv");
1606
_exit(EX_OSERR);
1607
}
1608
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1609
if(ret == -1){
1610
perror_plus("setenv");
1611
_exit(EX_OSERR);
1612
}
1613
ret = setenv("MODE", mode, 1);
1614
if(ret == -1){
1615
perror_plus("setenv");
1616
_exit(EX_OSERR);
1617
}
1618
char *delaystring;
1619
ret = asprintf(&delaystring, "%f", (double)delay);
1620
if(ret == -1){
1621
perror_plus("asprintf");
1622
_exit(EX_OSERR);
1623
}
1624
ret = setenv("DELAY", delaystring, 1);
1625
if(ret == -1){
1626
free(delaystring);
1627
perror_plus("setenv");
1628
_exit(EX_OSERR);
1629
}
1630
free(delaystring);
1631
if(connect_to != NULL){
1632
ret = setenv("CONNECT", connect_to, 1);
1633
if(ret == -1){
1634
perror_plus("setenv");
1635
_exit(EX_OSERR);
1636
}
1637
}
1638
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1639
if(hook_fd == -1){
1640
perror_plus("openat");
1641
_exit(EXIT_FAILURE);
1642
}
1643
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1644
perror_plus("close");
1645
_exit(EXIT_FAILURE);
1646
}
1647
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1648
environ) == -1){
1649
perror_plus("fexecve");
1650
_exit(EXIT_FAILURE);
1651
}
1652
} else {
1653
if(hook_pid == -1){
1654
perror_plus("fork");
1655
free(direntry);
1656
continue;
1657
}
1658
int status;
1659
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1660
perror_plus("waitpid");
1661
free(direntry);
1662
continue;
1663
}
1664
if(WIFEXITED(status)){
1665
if(WEXITSTATUS(status) != 0){
1666
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1667
" with status %d\n", direntry->d_name,
1668
WEXITSTATUS(status));
1669
free(direntry);
1670
continue;
1671
}
1672
} else if(WIFSIGNALED(status)){
1673
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1674
" signal %d\n", direntry->d_name,
1675
WTERMSIG(status));
1676
free(direntry);
1677
continue;
1678
} else {
1679
fprintf_plus(stderr, "Warning: network hook \"%s\""
1680
" crashed\n", direntry->d_name);
1681
free(direntry);
1682
continue;
1683
}
1684
}
1685
if(debug){
1686
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1687
direntry->d_name);
1688
}
1689
free(direntry);
1690
}
1691
free(direntries);
1692
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1693
perror_plus("close");
1694
} else {
1695
hookdir_fd = -1;
1696
}
1697
close(devnull);
1698
}
1699
1700
__attribute__((nonnull, warn_unused_result))
1701
error_t bring_up_interface(const char *const interface,
1702
const float delay){
1703
error_t old_errno = errno;
1704
int ret;
1705
struct ifreq network;
1706
unsigned int if_index = if_nametoindex(interface);
1707
if(if_index == 0){
1708
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1709
errno = old_errno;
1710
return ENXIO;
1711
}
1712
1713
if(quit_now){
1714
errno = old_errno;
1715
return EINTR;
1716
}
1717
1718
if(not interface_is_up(interface)){
1719
error_t ret_errno = 0, ioctl_errno = 0;
1720
if(not get_flags(interface, &network)){
1721
ret_errno = errno;
1722
fprintf_plus(stderr, "Failed to get flags for interface "
1723
"\"%s\"\n", interface);
1724
errno = old_errno;
1725
return ret_errno;
1726
}
1727
network.ifr_flags |= IFF_UP; /* set flag */
1728
1729
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1730
if(sd == -1){
1731
ret_errno = errno;
1732
perror_plus("socket");
1733
errno = old_errno;
1734
return ret_errno;
1735
}
1736
1737
if(quit_now){
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
if(ret == -1){
1740
perror_plus("close");
1741
}
1742
errno = old_errno;
1743
return EINTR;
1744
}
1745
1746
if(debug){
1747
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1748
interface);
1749
}
1750
1751
/* Raise privileges */
1752
ret_errno = raise_privileges();
1753
if(ret_errno != 0){
1754
errno = ret_errno;
1755
perror_plus("Failed to raise privileges");
1756
}
1757
1758
#ifdef __linux__
1759
int ret_linux;
1760
bool restore_loglevel = false;
1761
if(ret_errno == 0){
1762
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1763
messages about the network interface to mess up the prompt */
1764
ret_linux = klogctl(8, NULL, 5);
1765
if(ret_linux == -1){
1766
perror_plus("klogctl");
1767
} else {
1768
restore_loglevel = true;
1769
}
1770
}
1771
#endif /* __linux__ */
1772
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1773
ioctl_errno = errno;
1774
#ifdef __linux__
1775
if(restore_loglevel){
1776
ret_linux = klogctl(7, NULL, 0);
1777
if(ret_linux == -1){
1778
perror_plus("klogctl");
1779
}
1780
}
1781
#endif /* __linux__ */
1782
1783
/* If raise_privileges() succeeded above */
1784
if(ret_errno == 0){
1785
/* Lower privileges */
1786
ret_errno = lower_privileges();
1787
if(ret_errno != 0){
1788
errno = ret_errno;
1789
perror_plus("Failed to lower privileges");
1790
}
1791
}
1792
1793
/* Close the socket */
1794
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1795
if(ret == -1){
1796
perror_plus("close");
1797
}
1798
1799
if(ret_setflags == -1){
1800
errno = ioctl_errno;
1801
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1802
errno = old_errno;
1803
return ioctl_errno;
1804
}
1805
} else if(debug){
1806
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1807
interface);
1808
}
1809
1810
/* Sleep checking until interface is running.
1811
Check every 0.25s, up to total time of delay */
1812
for(int i=0; i < delay * 4; i++){
1813
if(interface_is_running(interface)){
1814
break;
1815
}
1816
struct timespec sleeptime = { .tv_nsec = 250000000 };
1817
ret = nanosleep(&sleeptime, NULL);
1818
if(ret == -1 and errno != EINTR){
1819
perror_plus("nanosleep");
1820
}
1821
}
1822
1823
errno = old_errno;
1824
return 0;
1825
}
1826
1827
__attribute__((nonnull, warn_unused_result))
1828
error_t take_down_interface(const char *const interface){
1829
error_t old_errno = errno;
1830
struct ifreq network;
1831
unsigned int if_index = if_nametoindex(interface);
1832
if(if_index == 0){
1833
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1834
errno = old_errno;
1835
return ENXIO;
1836
}
1837
if(interface_is_up(interface)){
1838
error_t ret_errno = 0, ioctl_errno = 0;
1839
if(not get_flags(interface, &network) and debug){
1840
ret_errno = errno;
1841
fprintf_plus(stderr, "Failed to get flags for interface "
1842
"\"%s\"\n", interface);
1843
errno = old_errno;
1844
return ret_errno;
1845
}
1846
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1847
1848
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1849
if(sd == -1){
1850
ret_errno = errno;
1851
perror_plus("socket");
1852
errno = old_errno;
1853
return ret_errno;
1854
}
1855
1856
if(debug){
1857
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1858
interface);
1859
}
1860
1861
/* Raise privileges */
1862
ret_errno = raise_privileges();
1863
if(ret_errno != 0){
1864
errno = ret_errno;
1865
perror_plus("Failed to raise privileges");
1866
}
1867
1868
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1869
ioctl_errno = errno;
1870
1871
/* If raise_privileges() succeeded above */
1872
if(ret_errno == 0){
1873
/* Lower privileges */
1874
ret_errno = lower_privileges();
1875
if(ret_errno != 0){
1876
errno = ret_errno;
1877
perror_plus("Failed to lower privileges");
1878
}
1879
}
1880
1881
/* Close the socket */
1882
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1883
if(ret == -1){
1884
perror_plus("close");
1885
}
1886
1887
if(ret_setflags == -1){
1888
errno = ioctl_errno;
1889
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1890
errno = old_errno;
1891
return ioctl_errno;
1892
}
1893
} else if(debug){
1894
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1895
interface);
1896
}
1897
1898
errno = old_errno;
1899
return 0;
893
1900
}
894
1901
895
1902
int main(int argc, char *argv[]){
1903
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1904
.priority = "SECURE256:!CTYPE-X.509:"
1905
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
1906
.interfaces = NULL, .interfaces_size = 0 };
896
1907
AvahiSServiceBrowser *sb = NULL;
897
int error;
1908
error_t ret_errno;
898
1909
int ret;
899
1910
intmax_t tmpmax;
900
1911
char *tmp;
901
1912
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;
1913
char *interfaces_to_take_down = NULL;
1914
size_t interfaces_to_take_down_size = 0;
1915
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1916
char old_tempdir[] = "/tmp/mandosXXXXXX";
1917
char *tempdir = NULL;
910
1918
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
911
1919
const char *seckey = PATHDIR "/" SECKEY;
912
1920
const char *pubkey = PATHDIR "/" PUBKEY;
1921
char *interfaces_hooks = NULL;
913
1922
914
1923
bool gnutls_initialized = false;
915
1924
bool gpgme_initialized = false;
916
1925
float delay = 2.5f;
1926
double retry_interval = 10; /* 10s between trying a server and
1927
retrying the same server again */
917
1928
918
struct sigaction old_sigterm_action;
1929
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
919
1930
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
920
1931
1932
uid = getuid();
1933
gid = getgid();
1934
1935
/* Lower any group privileges we might have, just to be safe */
1936
errno = 0;
1937
ret = setgid(gid);
1938
if(ret == -1){
1939
perror_plus("setgid");
1940
}
1941
1942
/* Lower user privileges (temporarily) */
1943
errno = 0;
1944
ret = seteuid(uid);
1945
if(ret == -1){
1946
perror_plus("seteuid");
1947
}
1948
1949
if(quit_now){
1950
goto end;
1951
}
1952
921
1953
{
922
1954
struct argp_option options[] = {
923
1955
{ .name = "debug", .key = 128,
952
1984
.arg = "SECONDS",
953
1985
.doc = "Maximum delay to wait for interface startup",
954
1986
.group = 2 },
1987
{ .name = "retry", .key = 132,
1988
.arg = "SECONDS",
1989
.doc = "Retry interval used when denied by the Mandos server",
1990
.group = 2 },
1991
{ .name = "network-hook-dir", .key = 133,
1992
.arg = "DIR",
1993
.doc = "Directory where network hooks are located",
1994
.group = 2 },
1995
/*
1996
* These reproduce what we would get without ARGP_NO_HELP
1997
*/
1998
{ .name = "help", .key = '?',
1999
.doc = "Give this help list", .group = -1 },
2000
{ .name = "usage", .key = -3,
2001
.doc = "Give a short usage message", .group = -1 },
2002
{ .name = "version", .key = 'V',
2003
.doc = "Print program version", .group = -1 },
955
2004
{ .name = NULL }
956
2005
};
957
2006
958
2007
error_t parse_opt(int key, char *arg,
959
2008
struct argp_state *state){
2009
errno = 0;
960
2010
switch(key){
961
2011
case 128: /* --debug */
962
2012
debug = true;
965
2015
connect_to = arg;
966
2016
break;
967
2017
case 'i': /* --interface */
968
interface = arg;
2018
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2019
arg, (int)',');
2020
if(ret_errno != 0){
2021
argp_error(state, "%s", strerror(ret_errno));
2022
}
969
2023
break;
970
2024
case 's': /* --seckey */
971
2025
seckey = arg;
978
2032
tmpmax = strtoimax(arg, &tmp, 10);
979
2033
if(errno != 0 or tmp == arg or *tmp != '\0'
980
2034
or tmpmax != (typeof(mc.dh_bits))tmpmax){
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
2035
argp_error(state, "Bad number of DH bits");
983
2036
}
984
2037
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
985
2038
break;
990
2043
errno = 0;
991
2044
delay = strtof(arg, &tmp);
992
2045
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:
2046
argp_error(state, "Bad delay");
2047
}
2048
case 132: /* --retry */
2049
errno = 0;
2050
retry_interval = strtod(arg, &tmp);
2051
if(errno != 0 or tmp == arg or *tmp != '\0'
2052
or (retry_interval * 1000) > INT_MAX
2053
or retry_interval < 0){
2054
argp_error(state, "Bad retry interval");
2055
}
2056
break;
2057
case 133: /* --network-hook-dir */
2058
hookdir = arg;
2059
break;
2060
/*
2061
* These reproduce what we would get without ARGP_NO_HELP
2062
*/
2063
case '?': /* --help */
2064
argp_state_help(state, state->out_stream,
2065
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2066
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2067
case -3: /* --usage */
2068
argp_state_help(state, state->out_stream,
2069
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2070
case 'V': /* --version */
2071
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2072
exit(argp_err_exit_status);
1000
2073
break;
1001
2074
default:
1002
2075
return ARGP_ERR_UNKNOWN;
1003
2076
}
1004
return 0;
2077
return errno;
1005
2078
}
1006
2079
1007
2080
struct argp argp = { .options = options, .parser = parse_opt,
1008
2081
.args_doc = "",
1009
2082
.doc = "Mandos client -- Get and decrypt"
1010
2083
" 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
}
2084
ret = argp_parse(&argp, argc, argv,
2085
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2086
switch(ret){
2087
case 0:
2088
break;
2089
case ENOMEM:
2090
default:
2091
errno = ret;
2092
perror_plus("argp_parse");
2093
exitcode = EX_OSERR;
2094
goto end;
2095
case EINVAL:
2096
exitcode = EX_USAGE;
2097
goto end;
2098
}
2099
}
2100
2101
{
2102
/* Work around Debian bug #633582:
2103
<http://bugs.debian.org/633582> */
2104
2105
/* Re-raise privileges */
2106
ret_errno = raise_privileges();
2107
if(ret_errno != 0){
2108
errno = ret_errno;
2109
perror_plus("Failed to raise privileges");
2110
} else {
2111
struct stat st;
2112
2113
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2114
int seckey_fd = open(seckey, O_RDONLY);
2115
if(seckey_fd == -1){
2116
perror_plus("open");
2117
} else {
2118
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2119
if(ret == -1){
2120
perror_plus("fstat");
2121
} else {
2122
if(S_ISREG(st.st_mode)
2123
and st.st_uid == 0 and st.st_gid == 0){
2124
ret = fchown(seckey_fd, uid, gid);
2125
if(ret == -1){
2126
perror_plus("fchown");
2127
}
2128
}
2129
}
2130
TEMP_FAILURE_RETRY(close(seckey_fd));
2131
}
2132
}
2133
2134
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2135
int pubkey_fd = open(pubkey, O_RDONLY);
2136
if(pubkey_fd == -1){
2137
perror_plus("open");
2138
} else {
2139
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2140
if(ret == -1){
2141
perror_plus("fstat");
2142
} else {
2143
if(S_ISREG(st.st_mode)
2144
and st.st_uid == 0 and st.st_gid == 0){
2145
ret = fchown(pubkey_fd, uid, gid);
2146
if(ret == -1){
2147
perror_plus("fchown");
2148
}
2149
}
2150
}
2151
TEMP_FAILURE_RETRY(close(pubkey_fd));
2152
}
2153
}
2154
2155
/* Lower privileges */
2156
ret_errno = lower_privileges();
2157
if(ret_errno != 0){
2158
errno = ret_errno;
2159
perror_plus("Failed to lower privileges");
2160
}
2161
}
2162
}
2163
2164
/* Remove invalid interface names (except "none") */
2165
{
2166
char *interface = NULL;
2167
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2168
interface))){
2169
if(strcmp(interface, "none") != 0
2170
and if_nametoindex(interface) == 0){
2171
if(interface[0] != '\0'){
2172
fprintf_plus(stderr, "Not using nonexisting interface"
2173
" \"%s\"\n", interface);
2174
}
2175
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2176
interface = NULL;
2177
}
2178
}
2179
}
2180
2181
/* Run network hooks */
2182
{
2183
if(mc.interfaces != NULL){
2184
interfaces_hooks = malloc(mc.interfaces_size);
2185
if(interfaces_hooks == NULL){
2186
perror_plus("malloc");
2187
goto end;
2188
}
2189
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2190
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2191
}
2192
run_network_hooks("start", interfaces_hooks != NULL ?
2193
interfaces_hooks : "", delay);
1017
2194
}
1018
2195
1019
2196
if(not debug){
1024
2201
from the signal handler */
1025
2202
/* Initialize the pseudo-RNG for Avahi */
1026
2203
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;
2204
simple_poll = avahi_simple_poll_new();
2205
if(simple_poll == NULL){
2206
fprintf_plus(stderr,
2207
"Avahi: Failed to create simple poll object.\n");
2208
exitcode = EX_UNAVAILABLE;
1031
2209
goto end;
1032
2210
}
1033
2211
1034
2212
sigemptyset(&sigterm_action.sa_mask);
1035
2213
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1036
2214
if(ret == -1){
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
2215
perror_plus("sigaddset");
2216
exitcode = EX_OSERR;
1039
2217
goto end;
1040
2218
}
1041
2219
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1042
2220
if(ret == -1){
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
2221
perror_plus("sigaddset");
2222
exitcode = EX_OSERR;
1045
2223
goto end;
1046
2224
}
1047
2225
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1048
2226
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");
2227
perror_plus("sigaddset");
2228
exitcode = EX_OSERR;
2229
goto end;
2230
}
2231
/* Need to check if the handler is SIG_IGN before handling:
2232
| [[info:libc:Initial Signal Actions]] |
2233
| [[info:libc:Basic Signal Handling]] |
2234
*/
2235
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2236
if(ret == -1){
2237
perror_plus("sigaction");
2238
return EX_OSERR;
2239
}
2240
if(old_sigterm_action.sa_handler != SIG_IGN){
2241
ret = sigaction(SIGINT, &sigterm_action, NULL);
2242
if(ret == -1){
2243
perror_plus("sigaction");
2244
exitcode = EX_OSERR;
2245
goto end;
2246
}
2247
}
2248
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2249
if(ret == -1){
2250
perror_plus("sigaction");
2251
return EX_OSERR;
2252
}
2253
if(old_sigterm_action.sa_handler != SIG_IGN){
2254
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2255
if(ret == -1){
2256
perror_plus("sigaction");
2257
exitcode = EX_OSERR;
2258
goto end;
2259
}
2260
}
2261
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2262
if(ret == -1){
2263
perror_plus("sigaction");
2264
return EX_OSERR;
2265
}
2266
if(old_sigterm_action.sa_handler != SIG_IGN){
2267
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2268
if(ret == -1){
2269
perror_plus("sigaction");
2270
exitcode = EX_OSERR;
2271
goto end;
2272
}
2273
}
2274
2275
/* If no interfaces were specified, make a list */
2276
if(mc.interfaces == NULL){
2277
struct dirent **direntries = NULL;
2278
/* Look for any good interfaces */
2279
ret = scandir(sys_class_net, &direntries, good_interface,
2280
alphasort);
2281
if(ret >= 1){
2282
/* Add all found interfaces to interfaces list */
2283
for(int i = 0; i < ret; ++i){
2284
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2285
direntries[i]->d_name);
2286
if(ret_errno != 0){
2287
errno = ret_errno;
2288
perror_plus("argz_add");
2289
free(direntries[i]);
2290
continue;
2291
}
2292
if(debug){
2293
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2294
direntries[i]->d_name);
2295
}
2296
free(direntries[i]);
2297
}
2298
free(direntries);
2299
} else {
2300
if(ret == 0){
2301
free(direntries);
2302
}
2303
fprintf_plus(stderr, "Could not find a network interface\n");
2304
exitcode = EXIT_FAILURE;
2305
goto end;
2306
}
2307
}
2308
2309
/* Bring up interfaces which are down, and remove any "none"s */
2310
{
2311
char *interface = NULL;
2312
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2313
interface))){
2314
/* If interface name is "none", stop bringing up interfaces.
2315
Also remove all instances of "none" from the list */
2316
if(strcmp(interface, "none") == 0){
2317
argz_delete(&mc.interfaces, &mc.interfaces_size,
2318
interface);
2319
interface = NULL;
2320
while((interface = argz_next(mc.interfaces,
2321
mc.interfaces_size, interface))){
2322
if(strcmp(interface, "none") == 0){
2323
argz_delete(&mc.interfaces, &mc.interfaces_size,
2324
interface);
2325
interface = NULL;
1113
2326
}
1114
2327
}
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
2328
break;
1126
2329
}
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;
2330
bool interface_was_up = interface_is_up(interface);
2331
errno = bring_up_interface(interface, delay);
2332
if(not interface_was_up){
2333
if(errno != 0){
2334
perror_plus("Failed to bring up interface");
2335
} else {
2336
errno = argz_add(&interfaces_to_take_down,
2337
&interfaces_to_take_down_size,
2338
interface);
2339
if(errno != 0){
2340
perror_plus("argz_add");
2341
}
2342
}
2343
}
2344
}
2345
if(debug and (interfaces_to_take_down == NULL)){
2346
fprintf_plus(stderr, "No interfaces were brought up\n");
2347
}
2348
}
2349
2350
/* If we only got one interface, explicitly use only that one */
2351
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2352
if(debug){
2353
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2354
mc.interfaces);
2355
}
2356
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2357
}
2358
2359
if(quit_now){
2360
goto end;
2361
}
2362
2363
ret = init_gnutls_global(pubkey, seckey, &mc);
2364
if(ret == -1){
2365
fprintf_plus(stderr, "init_gnutls_global failed\n");
2366
exitcode = EX_UNAVAILABLE;
1166
2367
goto end;
1167
2368
} else {
1168
2369
gnutls_initialized = true;
1169
2370
}
1170
2371
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;
2372
if(quit_now){
2373
goto end;
2374
}
2375
2376
/* Try /run/tmp before /tmp */
2377
tempdir = mkdtemp(run_tempdir);
2378
if(tempdir == NULL and errno == ENOENT){
2379
if(debug){
2380
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2381
run_tempdir, old_tempdir);
2382
}
2383
tempdir = mkdtemp(old_tempdir);
2384
}
2385
if(tempdir == NULL){
2386
perror_plus("mkdtemp");
2387
goto end;
2388
}
2389
2390
if(quit_now){
2391
goto end;
2392
}
2393
2394
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2395
fprintf_plus(stderr, "init_gpgme failed\n");
2396
exitcode = EX_UNAVAILABLE;
1180
2397
goto end;
1181
2398
} else {
1182
2399
gpgme_initialized = true;
1183
2400
}
1184
2401
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
}
2402
if(quit_now){
2403
goto end;
1192
2404
}
1193
2405
1194
2406
if(connect_to != NULL){
1195
2407
/* Connect directly, do not use Zeroconf */
1196
2408
/* (Mainly meant for debugging) */
1197
2409
char *address = strrchr(connect_to, ':');
2410
1198
2411
if(address == NULL){
1199
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
1203
uint16_t port;
2412
fprintf_plus(stderr, "No colon in address\n");
2413
exitcode = EX_USAGE;
2414
goto end;
2415
}
2416
2417
if(quit_now){
2418
goto end;
2419
}
2420
2421
in_port_t port;
1204
2422
errno = 0;
1205
2423
tmpmax = strtoimax(address+1, &tmp, 10);
1206
2424
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;
2425
or tmpmax != (in_port_t)tmpmax){
2426
fprintf_plus(stderr, "Bad port number\n");
2427
exitcode = EX_USAGE;
2428
goto end;
2429
}
2430
2431
if(quit_now){
2432
goto end;
2433
}
2434
2435
port = (in_port_t)tmpmax;
1213
2436
*address = '\0';
1214
address = connect_to;
1215
2437
/* Colon in address indicates IPv6 */
1216
2438
int af;
1217
if(strchr(address, ':') != NULL){
2439
if(strchr(connect_to, ':') != NULL){
1218
2440
af = AF_INET6;
2441
/* Accept [] around IPv6 address - see RFC 5952 */
2442
if(connect_to[0] == '[' and address[-1] == ']')
2443
{
2444
connect_to++;
2445
address[-1] = '\0';
2446
}
1219
2447
} else {
1220
2448
af = AF_INET;
1221
2449
}
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
2450
address = connect_to;
2451
2452
if(quit_now){
2453
goto end;
2454
}
2455
2456
while(not quit_now){
2457
ret = start_mandos_communication(address, port, if_index, af,
2458
&mc);
2459
if(quit_now or ret == 0){
2460
break;
2461
}
2462
if(debug){
2463
fprintf_plus(stderr, "Retrying in %d seconds\n",
2464
(int)retry_interval);
2465
}
2466
sleep((unsigned int)retry_interval);
2467
}
2468
2469
if(not quit_now){
1226
2470
exitcode = EXIT_SUCCESS;
1227
2471
}
1228
goto end;
1229
}
1230
2472
2473
goto end;
2474
}
2475
2476
if(quit_now){
2477
goto end;
2478
}
2479
1231
2480
{
1232
2481
AvahiServerConfig config;
1233
2482
/* Do not publish any local Zeroconf records */
1238
2487
config.publish_domain = 0;
1239
2488
1240
2489
/* Allocate a new server */
1241
mc.server = avahi_server_new(avahi_simple_poll_get
1242
(mc.simple_poll), &config, NULL,
1243
NULL, &error);
2490
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2491
&config, NULL, NULL, &ret_errno);
1244
2492
1245
2493
/* Free the Avahi configuration data */
1246
2494
avahi_server_config_free(&config);
1248
2496
1249
2497
/* Check if creating the Avahi server object succeeded */
1250
2498
if(mc.server == NULL){
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
1252
avahi_strerror(error));
1253
exitcode = EXIT_FAILURE;
2499
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2500
avahi_strerror(ret_errno));
2501
exitcode = EX_UNAVAILABLE;
2502
goto end;
2503
}
2504
2505
if(quit_now){
1254
2506
goto end;
1255
2507
}
1256
2508
1257
2509
/* Create the Avahi service browser */
1258
2510
sb = avahi_s_service_browser_new(mc.server, if_index,
1259
2511
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1260
NULL, 0, browse_callback, NULL);
2512
NULL, 0, browse_callback,
2513
(void *)&mc);
1261
2514
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;
2515
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2516
avahi_strerror(avahi_server_errno(mc.server)));
2517
exitcode = EX_UNAVAILABLE;
2518
goto end;
2519
}
2520
2521
if(quit_now){
1265
2522
goto end;
1266
2523
}
1267
2524
1268
2525
/* Run the main loop */
1269
2526
1270
2527
if(debug){
1271
fprintf(stderr, "Starting Avahi loop search\n");
2528
fprintf_plus(stderr, "Starting Avahi loop search\n");
1272
2529
}
1273
2530
1274
avahi_simple_poll_loop(mc.simple_poll);
2531
ret = avahi_loop_with_timeout(simple_poll,
2532
(int)(retry_interval * 1000), &mc);
2533
if(debug){
2534
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2535
(ret == 0) ? "successfully" : "with error");
2536
}
1275
2537
1276
2538
end:
1277
2539
1278
2540
if(debug){
1279
fprintf(stderr, "%s exiting\n", argv[0]);
2541
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1280
2542
}
1281
2543
1282
2544
/* Cleanup things */
2545
free(mc.interfaces);
2546
1283
2547
if(sb != NULL)
1284
2548
avahi_s_service_browser_free(sb);
1285
2549
1286
2550
if(mc.server != NULL)
1287
2551
avahi_server_free(mc.server);
1288
2552
1289
if(mc.simple_poll != NULL)
1290
avahi_simple_poll_free(mc.simple_poll);
2553
if(simple_poll != NULL)
2554
avahi_simple_poll_free(simple_poll);
1291
2555
1292
2556
if(gnutls_initialized){
1293
2557
gnutls_certificate_free_credentials(mc.cred);
1299
2563
gpgme_release(mc.ctx);
1300
2564
}
1301
2565
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");
1310
}
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
}
1324
char *fullname = NULL;
1325
ret = asprintf(&fullname, "%s/%s", tempdir,
1326
direntry->d_name);
1327
if(ret < 0){
1328
perror("asprintf");
1329
continue;
1330
}
1331
ret = remove(fullname);
1332
if(ret == -1){
1333
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1334
strerror(errno));
1335
}
1336
free(fullname);
1337
}
1338
closedir(d);
1339
}
1340
ret = rmdir(tempdir);
1341
if(ret == -1 and errno != ENOENT){
1342
perror("rmdir");
1343
}
2566
/* Cleans up the circular linked list of Mandos servers the client
2567
has seen */
2568
if(mc.current_server != NULL){
2569
mc.current_server->prev->next = NULL;
2570
while(mc.current_server != NULL){
2571
server *next = mc.current_server->next;
2572
#ifdef __GNUC__
2573
#pragma GCC diagnostic push
2574
#pragma GCC diagnostic ignored "-Wcast-qual"
2575
#endif
2576
free((char *)(mc.current_server->ip));
2577
#ifdef __GNUC__
2578
#pragma GCC diagnostic pop
2579
#endif
2580
free(mc.current_server);
2581
mc.current_server = next;
2582
}
2583
}
2584
2585
/* Re-raise privileges */
2586
{
2587
ret_errno = raise_privileges();
2588
if(ret_errno != 0){
2589
errno = ret_errno;
2590
perror_plus("Failed to raise privileges");
2591
} else {
2592
2593
/* Run network hooks */
2594
run_network_hooks("stop", interfaces_hooks != NULL ?
2595
interfaces_hooks : "", delay);
2596
2597
/* Take down the network interfaces which were brought up */
2598
{
2599
char *interface = NULL;
2600
while((interface=argz_next(interfaces_to_take_down,
2601
interfaces_to_take_down_size,
2602
interface))){
2603
ret_errno = take_down_interface(interface);
2604
if(ret_errno != 0){
2605
errno = ret_errno;
2606
perror_plus("Failed to take down interface");
2607
}
2608
}
2609
if(debug and (interfaces_to_take_down == NULL)){
2610
fprintf_plus(stderr, "No interfaces needed to be taken"
2611
" down\n");
2612
}
2613
}
2614
}
2615
2616
ret_errno = lower_privileges_permanently();
2617
if(ret_errno != 0){
2618
errno = ret_errno;
2619
perror_plus("Failed to lower privileges permanently");
2620
}
2621
}
2622
2623
free(interfaces_to_take_down);
2624
free(interfaces_hooks);
2625
2626
/* Removes the GPGME temp directory and all files inside */
2627
if(tempdir != NULL){
2628
struct dirent **direntries = NULL;
2629
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2630
O_NOFOLLOW));
2631
if(tempdir_fd == -1){
2632
perror_plus("open");
2633
} else {
2634
#ifdef __GLIBC__
2635
#if __GLIBC_PREREQ(2, 15)
2636
int numentries = scandirat(tempdir_fd, ".", &direntries,
2637
notdotentries, alphasort);
2638
#else /* not __GLIBC_PREREQ(2, 15) */
2639
int numentries = scandir(tempdir, &direntries, notdotentries,
2640
alphasort);
2641
#endif /* not __GLIBC_PREREQ(2, 15) */
2642
#else /* not __GLIBC__ */
2643
int numentries = scandir(tempdir, &direntries, notdotentries,
2644
alphasort);
2645
#endif /* not __GLIBC__ */
2646
if(numentries >= 0){
2647
for(int i = 0; i < numentries; i++){
2648
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2649
if(ret == -1){
2650
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2651
" \"%s\", 0): %s\n", tempdir,
2652
direntries[i]->d_name, strerror(errno));
2653
}
2654
free(direntries[i]);
2655
}
2656
2657
/* need to clean even if 0 because man page doesn't specify */
2658
free(direntries);
2659
if(numentries == -1){
2660
perror_plus("scandir");
2661
}
2662
ret = rmdir(tempdir);
2663
if(ret == -1 and errno != ENOENT){
2664
perror_plus("rmdir");
2665
}
2666
}
2667
TEMP_FAILURE_RETRY(close(tempdir_fd));
2668
}
2669
}
2670
2671
if(quit_now){
2672
sigemptyset(&old_sigterm_action.sa_mask);
2673
old_sigterm_action.sa_handler = SIG_DFL;
2674
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2675
&old_sigterm_action,
2676
NULL));
2677
if(ret == -1){
2678
perror_plus("sigaction");
2679
}
2680
do {
2681
ret = raise(signal_received);
2682
} while(ret != 0 and errno == EINTR);
2683
if(ret != 0){
2684
perror_plus("raise");
2685
abort();
2686
}
2687
TEMP_FAILURE_RETRY(pause());
1344
2688
}
1345
2689
1346
2690
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0