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237.2.68
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-02-09 02:13:58 UTC
- mto: (24.1.136 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: teddy@fukt.bsnet.se-20090209021358-6nrlc91oi08hn5hb
* initramfs-tools-hook: Whitespace change only.
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- 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 © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
39
stdout, ferror(), sscanf(),
40
remove() */
41
#include <stdint.h> /* uint16_t, uint32_t */
45
42
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
48
45
#include <stdbool.h> /* bool, false, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
53
50
sockaddr_in6, PF_INET6,
54
51
SOCK_STREAM, uid_t, gid_t, open(),
55
52
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
53
#include <sys/stat.h> /* open() */
57
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
55
inet_pton(), connect() */
56
#include <fcntl.h> /* open() */
61
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
58
*/
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
60
#include <assert.h> /* assert() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
68
63
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
64
SIOCSIFFLAGS, if_indextoname(),
70
65
if_nametoindex(), IF_NAMESIZE */
72
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
68
*/
74
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
79
73
#include <iso646.h> /* not, or, and */
80
74
#include <argp.h> /* struct argp_option, error_t, struct
81
75
argp_state, struct argp,
82
76
argp_parse(), ARGP_KEY_ARG,
83
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
84
#include <signal.h> /* sigemptyset(), sigaddset(),
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() */
98
99
78
#ifdef __linux__
100
79
#include <sys/klog.h> /* klogctl() */
101
#endif /* __linux__ */
80
#endif
102
81
103
82
/* Avahi */
104
83
/* All Avahi types, constants and functions
118
97
init_gnutls_session(),
119
98
GNUTLS_* */
120
99
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
100
/* gnutls_certificate_set_openpgp_key_file(),
101
GNUTLS_OPENPGP_FMT_BASE64 */
123
102
124
103
/* GPGME */
125
104
#include <gpgme.h> /* All GPGME types, constants and
133
112
#define PATHDIR "/conf/conf.d/mandos"
134
113
#define SECKEY "seckey.txt"
135
114
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
115
138
116
bool debug = false;
139
117
static const char mandos_protocol_version[] = "1";
140
118
const char *argp_program_version = "mandos-client " VERSION;
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;
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
159
120
160
121
/* Used for passing in values through the Avahi callback functions */
161
122
typedef struct {
123
AvahiSimplePoll *simple_poll;
162
124
AvahiServer *server;
163
125
gnutls_certificate_credentials_t cred;
164
126
unsigned int dh_bits;
165
127
gnutls_dh_params_t dh_params;
166
128
const char *priority;
167
129
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
130
} mandos_context;
172
131
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
}
197
198
132
/*
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* bytes. "buffer_capacity" is how much is currently allocated,
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
201
135
* "buffer_length" is how much is already used.
202
136
*/
203
__attribute__((nonnull, warn_unused_result))
204
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
138
size_t buffer_capacity){
206
139
if(buffer_length + BUFFER_SIZE > buffer_capacity){
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;
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
141
if(buffer == NULL){
213
142
return 0;
214
143
}
215
*buffer = new_buf;
216
144
buffer_capacity += BUFFER_SIZE;
217
145
}
218
146
return buffer_capacity;
219
147
}
220
148
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
269
149
/*
270
150
* Initialize GPGME.
271
151
*/
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){
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
153
const char *pubkey, const char *tempdir){
154
int ret;
277
155
gpgme_error_t rc;
278
156
gpgme_engine_info_t engine_info;
279
157
158
280
159
/*
281
160
* Helper function to insert pub and seckey to the engine keyring.
282
161
*/
283
bool import_key(const char * const filename){
284
int ret;
162
bool import_key(const char *filename){
285
163
int fd;
286
164
gpgme_data_t pgp_data;
287
165
288
166
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
289
167
if(fd == -1){
290
perror_plus("open");
168
perror("open");
291
169
return false;
292
170
}
293
171
294
172
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
173
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
298
176
return false;
299
177
}
300
178
301
179
rc = gpgme_op_import(mc->ctx, pgp_data);
302
180
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
gpgme_strsource(rc), gpgme_strerror(rc));
305
183
return false;
306
184
}
307
185
308
186
ret = (int)TEMP_FAILURE_RETRY(close(fd));
309
187
if(ret == -1){
310
perror_plus("close");
188
perror("close");
311
189
}
312
190
gpgme_data_release(pgp_data);
313
191
return true;
314
192
}
315
193
316
194
if(debug){
317
fprintf_plus(stderr, "Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
318
196
}
319
197
320
198
/* Init GPGME */
321
199
gpgme_check_version(NULL);
322
200
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
201
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
326
204
return false;
327
205
}
328
206
329
/* Set GPGME home directory for the OpenPGP engine only */
207
/* Set GPGME home directory for the OpenPGP engine only */
330
208
rc = gpgme_get_engine_info(&engine_info);
331
209
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
211
gpgme_strsource(rc), gpgme_strerror(rc));
334
212
return false;
335
213
}
336
214
while(engine_info != NULL){
342
220
engine_info = engine_info->next;
343
221
}
344
222
if(engine_info == NULL){
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
223
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
347
224
return false;
348
225
}
349
226
350
227
/* Create new GPGME "context" */
351
228
rc = gpgme_new(&(mc->ctx));
352
229
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
356
232
return false;
357
233
}
358
234
360
236
return false;
361
237
}
362
238
363
return true;
239
return true;
364
240
}
365
241
366
242
/*
367
243
* Decrypt OpenPGP data.
368
244
* Returns -1 on error
369
245
*/
370
__attribute__((nonnull, warn_unused_result))
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
372
248
size_t crypto_size,
373
char **plaintext,
374
mandos_context *mc){
249
char **plaintext){
375
250
gpgme_data_t dh_crypto, dh_plain;
376
251
gpgme_error_t rc;
377
252
ssize_t ret;
379
254
ssize_t plaintext_length = 0;
380
255
381
256
if(debug){
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
257
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
383
258
}
384
259
385
260
/* Create new GPGME data buffer from memory cryptotext */
386
261
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
387
262
0);
388
263
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
264
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
391
266
return -1;
392
267
}
393
268
394
269
/* Create new empty GPGME data buffer for the plaintext */
395
270
rc = gpgme_data_new(&dh_plain);
396
271
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
272
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
400
274
gpgme_data_release(dh_crypto);
401
275
return -1;
402
276
}
405
279
data buffer */
406
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
407
281
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
410
284
plaintext_length = -1;
411
285
if(debug){
412
286
gpgme_decrypt_result_t result;
413
287
result = gpgme_op_decrypt_result(mc->ctx);
414
288
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
416
290
} else {
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);
291
fprintf(stderr, "Unsupported algorithm: %s\n",
292
result->unsupported_algorithm);
293
fprintf(stderr, "Wrong key usage: %u\n",
294
result->wrong_key_usage);
421
295
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
296
fprintf(stderr, "File name: %s\n", result->file_name);
423
297
}
424
298
gpgme_recipient_t recipient;
425
299
recipient = result->recipients;
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;
300
if(recipient){
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
307
? "No" : "Yes");
308
recipient = recipient->next;
309
}
435
310
}
436
311
}
437
312
}
439
314
}
440
315
441
316
if(debug){
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
317
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
443
318
}
444
319
445
320
/* Seek back to the beginning of the GPGME plaintext data buffer */
446
321
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
447
perror_plus("gpgme_data_seek");
322
perror("gpgme_data_seek");
448
323
plaintext_length = -1;
449
324
goto decrypt_end;
450
325
}
451
326
452
327
*plaintext = NULL;
453
328
while(true){
454
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
456
plaintext_capacity);
329
plaintext_capacity = adjustbuffer(plaintext,
330
(size_t)plaintext_length,
331
plaintext_capacity);
457
332
if(plaintext_capacity == 0){
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
333
perror("adjustbuffer");
334
plaintext_length = -1;
335
goto decrypt_end;
461
336
}
462
337
463
338
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
468
343
break;
469
344
}
470
345
if(ret < 0){
471
perror_plus("gpgme_data_read");
346
perror("gpgme_data_read");
472
347
plaintext_length = -1;
473
348
goto decrypt_end;
474
349
}
476
351
}
477
352
478
353
if(debug){
479
fprintf_plus(stderr, "Decrypted password is: ");
354
fprintf(stderr, "Decrypted password is: ");
480
355
for(ssize_t i = 0; i < plaintext_length; i++){
481
356
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
482
357
}
493
368
return plaintext_length;
494
369
}
495
370
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
371
static const char * safer_gnutls_strerror(int value){
372
const char *ret = gnutls_strerror(value); /* Spurious warning from
373
-Wunreachable-code */
499
374
if(ret == NULL)
500
375
ret = "(unknown)";
501
376
return ret;
502
377
}
503
378
504
379
/* GnuTLS log function callback */
505
__attribute__((nonnull))
506
380
static void debuggnutls(__attribute__((unused)) int level,
507
381
const char* string){
508
fprintf_plus(stderr, "GnuTLS: %s", string);
382
fprintf(stderr, "GnuTLS: %s", string);
509
383
}
510
384
511
__attribute__((nonnull, warn_unused_result))
512
static int init_gnutls_global(const char *pubkeyfilename,
513
const char *seckeyfilename,
514
mandos_context *mc){
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
387
const char *seckeyfilename){
515
388
int ret;
516
389
517
390
if(debug){
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
391
fprintf(stderr, "Initializing GnuTLS\n");
519
392
}
520
393
521
394
ret = gnutls_global_init();
522
395
if(ret != GNUTLS_E_SUCCESS){
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
396
fprintf(stderr, "GnuTLS global_init: %s\n",
397
safer_gnutls_strerror(ret));
525
398
return -1;
526
399
}
527
400
534
407
}
535
408
536
409
/* OpenPGP credentials */
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
538
411
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
from
414
-Wunreachable-code
415
*/
416
safer_gnutls_strerror(ret));
541
417
gnutls_global_deinit();
542
418
return -1;
543
419
}
544
420
545
421
if(debug){
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
548
pubkeyfilename,
549
seckeyfilename);
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
424
seckeyfilename);
550
425
}
551
426
552
427
ret = gnutls_certificate_set_openpgp_key_file
553
428
(mc->cred, pubkeyfilename, seckeyfilename,
554
429
GNUTLS_OPENPGP_FMT_BASE64);
555
430
if(ret != GNUTLS_E_SUCCESS){
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));
431
fprintf(stderr,
432
"Error[%d] while reading the OpenPGP key pair ('%s',"
433
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
561
436
goto globalfail;
562
437
}
563
438
564
439
/* GnuTLS server initialization */
565
440
ret = gnutls_dh_params_init(&mc->dh_params);
566
441
if(ret != GNUTLS_E_SUCCESS){
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
" %s\n", safer_gnutls_strerror(ret));
570
444
goto globalfail;
571
445
}
572
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
573
447
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
safer_gnutls_strerror(ret));
576
450
goto globalfail;
577
451
}
578
452
588
462
return -1;
589
463
}
590
464
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
594
467
int ret;
595
468
/* GnuTLS session creation */
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);
469
ret = gnutls_init(session, GNUTLS_SERVER);
602
470
if(ret != GNUTLS_E_SUCCESS){
603
fprintf_plus(stderr,
604
"Error in GnuTLS session initialization: %s\n",
605
safer_gnutls_strerror(ret));
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
safer_gnutls_strerror(ret));
606
473
}
607
474
608
475
{
609
476
const char *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);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
617
478
if(ret != GNUTLS_E_SUCCESS){
618
fprintf_plus(stderr, "Syntax error at: %s\n", err);
619
fprintf_plus(stderr, "GnuTLS error: %s\n",
620
safer_gnutls_strerror(ret));
479
fprintf(stderr, "Syntax error at: %s\n", err);
480
fprintf(stderr, "GnuTLS error: %s\n",
481
safer_gnutls_strerror(ret));
621
482
gnutls_deinit(*session);
622
483
return -1;
623
484
}
624
485
}
625
486
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);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
634
489
if(ret != GNUTLS_E_SUCCESS){
635
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
636
safer_gnutls_strerror(ret));
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
safer_gnutls_strerror(ret));
637
492
gnutls_deinit(*session);
638
493
return -1;
639
494
}
640
495
641
496
/* ignore client certificate if any. */
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
643
499
644
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
645
501
650
506
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
651
507
__attribute__((unused)) const char *txt){}
652
508
653
/* Set effective uid to 0, return errno */
654
__attribute__((warn_unused_result))
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
658
if(seteuid(0) == -1){
659
ret_errno = errno;
660
}
661
errno = old_errno;
662
return ret_errno;
663
}
664
665
/* Set effective and real user ID to 0. Return errno. */
666
__attribute__((warn_unused_result))
667
error_t raise_privileges_permanently(void){
668
error_t old_errno = errno;
669
error_t ret_errno = raise_privileges();
670
if(ret_errno != 0){
671
errno = old_errno;
672
return ret_errno;
673
}
674
if(setuid(0) == -1){
675
ret_errno = errno;
676
}
677
errno = old_errno;
678
return ret_errno;
679
}
680
681
/* Set effective user ID to unprivileged saved user ID */
682
__attribute__((warn_unused_result))
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
686
if(seteuid(uid) == -1){
687
ret_errno = errno;
688
}
689
errno = old_errno;
690
return ret_errno;
691
}
692
693
/* Lower privileges permanently */
694
__attribute__((warn_unused_result))
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
698
if(setuid(uid) == -1){
699
ret_errno = errno;
700
}
701
errno = old_errno;
702
return ret_errno;
703
}
704
705
/* Helper function to add_local_route() and remove_local_route() */
706
__attribute__((nonnull, warn_unused_result))
707
static bool add_remove_local_route(const bool add,
708
const char *address,
709
AvahiIfIndex if_index){
710
int ret;
711
char helper[] = "mandos-client-iprouteadddel";
712
char add_arg[] = "add";
713
char delete_arg[] = "delete";
714
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
715
if(pluginhelperdir == NULL){
716
if(debug){
717
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
718
" variable not set; cannot run helper\n");
719
}
720
return false;
721
}
722
723
char interface[IF_NAMESIZE];
724
if(if_indextoname((unsigned int)if_index, interface) == NULL){
725
perror_plus("if_indextoname");
726
return false;
727
}
728
729
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
730
if(devnull == -1){
731
perror_plus("open(\"/dev/null\", O_RDONLY)");
732
return false;
733
}
734
pid_t pid = fork();
735
if(pid == 0){
736
/* Child */
737
/* Raise privileges */
738
errno = raise_privileges_permanently();
739
if(errno != 0){
740
perror_plus("Failed to raise privileges");
741
/* _exit(EX_NOPERM); */
742
} else {
743
/* Set group */
744
errno = 0;
745
ret = setgid(0);
746
if(ret == -1){
747
perror_plus("setgid");
748
_exit(EX_NOPERM);
749
}
750
/* Reset supplementary groups */
751
errno = 0;
752
ret = setgroups(0, NULL);
753
if(ret == -1){
754
perror_plus("setgroups");
755
_exit(EX_NOPERM);
756
}
757
}
758
ret = dup2(devnull, STDIN_FILENO);
759
if(ret == -1){
760
perror_plus("dup2(devnull, STDIN_FILENO)");
761
_exit(EX_OSERR);
762
}
763
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
764
if(ret == -1){
765
perror_plus("close");
766
_exit(EX_OSERR);
767
}
768
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
769
if(ret == -1){
770
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
771
_exit(EX_OSERR);
772
}
773
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
774
O_RDONLY
775
| O_DIRECTORY
776
| O_PATH
777
| O_CLOEXEC));
778
if(helperdir_fd == -1){
779
perror_plus("open");
780
_exit(EX_UNAVAILABLE);
781
}
782
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
783
helper, O_RDONLY));
784
if(helper_fd == -1){
785
perror_plus("openat");
786
_exit(EX_UNAVAILABLE);
787
}
788
TEMP_FAILURE_RETRY(close(helperdir_fd));
789
#ifdef __GNUC__
790
#pragma GCC diagnostic push
791
#pragma GCC diagnostic ignored "-Wcast-qual"
792
#endif
793
if(fexecve(helper_fd, (char *const [])
794
{ helper, add ? add_arg : delete_arg, (char *)address,
795
interface, NULL }, environ) == -1){
796
#ifdef __GNUC__
797
#pragma GCC diagnostic pop
798
#endif
799
perror_plus("fexecve");
800
_exit(EXIT_FAILURE);
801
}
802
}
803
if(pid == -1){
804
perror_plus("fork");
805
return false;
806
}
807
int status;
808
pid_t pret = -1;
809
errno = 0;
810
do {
811
pret = waitpid(pid, &status, 0);
812
if(pret == -1 and errno == EINTR and quit_now){
813
int errno_raising = 0;
814
if((errno = raise_privileges()) != 0){
815
errno_raising = errno;
816
perror_plus("Failed to raise privileges in order to"
817
" kill helper program");
818
}
819
if(kill(pid, SIGTERM) == -1){
820
perror_plus("kill");
821
}
822
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
823
perror_plus("Failed to lower privileges after killing"
824
" helper program");
825
}
826
return false;
827
}
828
} while(pret == -1 and errno == EINTR);
829
if(pret == -1){
830
perror_plus("waitpid");
831
return false;
832
}
833
if(WIFEXITED(status)){
834
if(WEXITSTATUS(status) != 0){
835
fprintf_plus(stderr, "Error: iprouteadddel exited"
836
" with status %d\n", WEXITSTATUS(status));
837
return false;
838
}
839
return true;
840
}
841
if(WIFSIGNALED(status)){
842
fprintf_plus(stderr, "Error: iprouteadddel died by"
843
" signal %d\n", WTERMSIG(status));
844
return false;
845
}
846
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
847
return false;
848
}
849
850
__attribute__((nonnull, warn_unused_result))
851
static bool add_local_route(const char *address,
852
AvahiIfIndex if_index){
853
return add_remove_local_route(true, address, if_index);
854
}
855
856
__attribute__((nonnull, warn_unused_result))
857
static bool remove_local_route(const char *address,
858
AvahiIfIndex if_index){
859
return add_remove_local_route(false, address, if_index);
860
}
861
862
509
/* Called when a Mandos server is found */
863
__attribute__((nonnull, warn_unused_result))
864
static int start_mandos_communication(const char *ip, in_port_t port,
510
static int start_mandos_communication(const char *ip, uint16_t port,
865
511
AvahiIfIndex if_index,
866
int af, mandos_context *mc){
867
int ret, tcp_sd = -1;
512
mandos_context *mc, int af){
513
int ret, tcp_sd;
868
514
ssize_t sret;
869
struct sockaddr_storage to;
515
union {
516
struct sockaddr_in in;
517
struct sockaddr_in6 in6;
518
} to;
870
519
char *buffer = NULL;
871
char *decrypted_buffer = NULL;
520
char *decrypted_buffer;
872
521
size_t buffer_length = 0;
873
522
size_t buffer_capacity = 0;
523
ssize_t decrypted_buffer_size;
874
524
size_t written;
875
int retval = -1;
525
int retval = 0;
876
526
gnutls_session_t session;
877
527
int pf; /* Protocol family */
878
bool route_added = false;
879
880
errno = 0;
881
882
if(quit_now){
883
errno = EINTR;
884
return -1;
885
}
886
528
887
529
switch(af){
888
530
case AF_INET6:
892
534
pf = PF_INET;
893
535
break;
894
536
default:
895
fprintf_plus(stderr, "Bad address family: %d\n", af);
896
errno = EINVAL;
537
fprintf(stderr, "Bad address family: %d\n", af);
897
538
return -1;
898
539
}
899
540
900
/* If the interface is specified and we have a list of interfaces */
901
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
902
/* Check if the interface is one of the interfaces we are using */
903
bool match = false;
904
{
905
char *interface = NULL;
906
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
907
interface))){
908
if(if_nametoindex(interface) == (unsigned int)if_index){
909
match = true;
910
break;
911
}
912
}
913
}
914
if(not match){
915
/* This interface does not match any in the list, so we don't
916
connect to the server */
917
if(debug){
918
char interface[IF_NAMESIZE];
919
if(if_indextoname((unsigned int)if_index, interface) == NULL){
920
perror_plus("if_indextoname");
921
} else {
922
fprintf_plus(stderr, "Skipping server on non-used interface"
923
" \"%s\"\n",
924
if_indextoname((unsigned int)if_index,
925
interface));
926
}
927
}
928
return -1;
929
}
930
}
931
932
ret = init_gnutls_session(&session, mc);
541
ret = init_gnutls_session(mc, &session);
933
542
if(ret != 0){
934
543
return -1;
935
544
}
936
545
937
546
if(debug){
938
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
939
PRIuMAX "\n", ip, (uintmax_t)port);
547
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
548
"\n", ip, port);
940
549
}
941
550
942
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
551
tcp_sd = socket(pf, SOCK_STREAM, 0);
943
552
if(tcp_sd < 0){
944
int e = errno;
945
perror_plus("socket");
946
errno = e;
947
goto mandos_end;
948
}
949
950
if(quit_now){
951
errno = EINTR;
952
goto mandos_end;
553
perror("socket");
554
return -1;
953
555
}
954
556
955
557
memset(&to, 0, sizeof(to));
956
558
if(af == AF_INET6){
957
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
958
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
559
to.in6.sin6_family = (uint16_t)af;
560
ret = inet_pton(af, ip, &to.in6.sin6_addr);
959
561
} else { /* IPv4 */
960
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
961
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
562
to.in.sin_family = (sa_family_t)af;
563
ret = inet_pton(af, ip, &to.in.sin_addr);
962
564
}
963
565
if(ret < 0 ){
964
int e = errno;
965
perror_plus("inet_pton");
966
errno = e;
967
goto mandos_end;
566
perror("inet_pton");
567
return -1;
968
568
}
969
569
if(ret == 0){
970
int e = errno;
971
fprintf_plus(stderr, "Bad address: %s\n", ip);
972
errno = e;
973
goto mandos_end;
570
fprintf(stderr, "Bad address: %s\n", ip);
571
return -1;
974
572
}
975
573
if(af == AF_INET6){
976
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
977
if(IN6_IS_ADDR_LINKLOCAL
978
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
574
to.in6.sin6_port = htons(port); /* Spurious warnings from
575
-Wconversion and
576
-Wunreachable-code */
577
578
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
579
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
580
-Wunreachable-code*/
979
581
if(if_index == AVAHI_IF_UNSPEC){
980
fprintf_plus(stderr, "An IPv6 link-local address is"
981
" incomplete without a network interface\n");
982
errno = EINVAL;
983
goto mandos_end;
582
fprintf(stderr, "An IPv6 link-local address is incomplete"
583
" without a network interface\n");
584
return -1;
984
585
}
985
586
/* Set the network interface number as scope */
986
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
587
to.in6.sin6_scope_id = (uint32_t)if_index;
987
588
}
988
589
} else {
989
((struct sockaddr_in *)&to)->sin_port = htons(port);
990
}
991
992
if(quit_now){
993
errno = EINTR;
994
goto mandos_end;
590
to.in.sin_port = htons(port); /* Spurious warnings from
591
-Wconversion and
592
-Wunreachable-code */
995
593
}
996
594
997
595
if(debug){
998
596
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
999
597
char interface[IF_NAMESIZE];
1000
598
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1001
perror_plus("if_indextoname");
599
perror("if_indextoname");
1002
600
} else {
1003
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1004
"\n", ip, interface, (uintmax_t)port);
601
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
602
ip, interface, port);
1005
603
}
1006
604
} else {
1007
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1008
ip, (uintmax_t)port);
605
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
606
port);
1009
607
}
1010
608
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1011
609
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1012
if(af == AF_INET6){
1013
ret = getnameinfo((struct sockaddr *)&to,
1014
sizeof(struct sockaddr_in6),
1015
addrstr, sizeof(addrstr), NULL, 0,
1016
NI_NUMERICHOST);
1017
} else {
1018
ret = getnameinfo((struct sockaddr *)&to,
1019
sizeof(struct sockaddr_in),
1020
addrstr, sizeof(addrstr), NULL, 0,
1021
NI_NUMERICHOST);
1022
}
1023
if(ret == EAI_SYSTEM){
1024
perror_plus("getnameinfo");
1025
} else if(ret != 0) {
1026
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1027
} else if(strcmp(addrstr, ip) != 0){
1028
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1029
}
1030
}
1031
1032
if(quit_now){
1033
errno = EINTR;
1034
goto mandos_end;
1035
}
1036
1037
while(true){
1038
if(af == AF_INET6){
1039
ret = connect(tcp_sd, (struct sockaddr *)&to,
1040
sizeof(struct sockaddr_in6));
1041
} else {
1042
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1043
sizeof(struct sockaddr_in));
1044
}
1045
if(ret < 0){
1046
if(errno == ENETUNREACH
1047
and if_index != AVAHI_IF_UNSPEC
1048
and connect_to == NULL
1049
and not route_added and
1050
((af == AF_INET6 and not
1051
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1052
&to)->sin6_addr)))
1053
or (af == AF_INET and
1054
/* Not a a IPv4LL address */
1055
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1056
& 0xFFFF0000L) != 0xA9FE0000L))){
1057
/* Work around Avahi bug - Avahi does not announce link-local
1058
addresses if it has a global address, so local hosts with
1059
*only* a link-local address (e.g. Mandos clients) cannot
1060
connect to a Mandos server announced by Avahi on a server
1061
host with a global address. Work around this by retrying
1062
with an explicit route added with the server's address.
1063
1064
Avahi bug reference:
1065
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1066
https://bugs.debian.org/587961
1067
*/
1068
int e = errno;
1069
route_added = add_local_route(ip, if_index);
1070
if(route_added){
1071
continue;
1072
}
1073
errno = e;
1074
}
1075
if(errno != ECONNREFUSED or debug){
1076
int e = errno;
1077
perror_plus("connect");
1078
errno = e;
1079
}
1080
goto mandos_end;
1081
}
1082
1083
if(quit_now){
1084
errno = EINTR;
1085
goto mandos_end;
1086
}
1087
break;
610
const char *pcret;
611
if(af == AF_INET6){
612
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
613
sizeof(addrstr));
614
} else {
615
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
616
sizeof(addrstr));
617
}
618
if(pcret == NULL){
619
perror("inet_ntop");
620
} else {
621
if(strcmp(addrstr, ip) != 0){
622
fprintf(stderr, "Canonical address form: %s\n", addrstr);
623
}
624
}
625
}
626
627
if(af == AF_INET6){
628
ret = connect(tcp_sd, &to.in6, sizeof(to));
629
} else {
630
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
631
}
632
if(ret < 0){
633
perror("connect");
634
return -1;
1088
635
}
1089
636
1090
637
const char *out = mandos_protocol_version;
1092
639
while(true){
1093
640
size_t out_size = strlen(out);
1094
641
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1095
out_size - written));
642
out_size - written));
1096
643
if(ret == -1){
1097
int e = errno;
1098
perror_plus("write");
1099
errno = e;
644
perror("write");
645
retval = -1;
1100
646
goto mandos_end;
1101
647
}
1102
648
written += (size_t)ret;
1110
656
break;
1111
657
}
1112
658
}
1113
1114
if(quit_now){
1115
errno = EINTR;
1116
goto mandos_end;
1117
}
1118
659
}
1119
660
1120
661
if(debug){
1121
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1122
}
1123
1124
if(quit_now){
1125
errno = EINTR;
1126
goto mandos_end;
1127
}
1128
1129
/* This casting via intptr_t is to eliminate warning about casting
1130
an int to a pointer type. This is exactly how the GnuTLS Guile
1131
function "set-session-transport-fd!" does it. */
1132
gnutls_transport_set_ptr(session,
1133
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1134
1135
if(quit_now){
1136
errno = EINTR;
1137
goto mandos_end;
1138
}
1139
1140
do {
662
fprintf(stderr, "Establishing TLS session with %s\n", ip);
663
}
664
665
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
666
667
do{
1141
668
ret = gnutls_handshake(session);
1142
if(quit_now){
1143
errno = EINTR;
1144
goto mandos_end;
1145
}
1146
669
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1147
670
1148
671
if(ret != GNUTLS_E_SUCCESS){
1149
672
if(debug){
1150
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
673
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1151
674
gnutls_perror(ret);
1152
675
}
1153
errno = EPROTO;
676
retval = -1;
1154
677
goto mandos_end;
1155
678
}
1156
679
1157
680
/* Read OpenPGP packet that contains the wanted password */
1158
681
1159
682
if(debug){
1160
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1161
" %s\n", ip);
683
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
684
ip);
1162
685
}
1163
686
1164
687
while(true){
1165
1166
if(quit_now){
1167
errno = EINTR;
1168
goto mandos_end;
1169
}
1170
1171
buffer_capacity = incbuffer(&buffer, buffer_length,
1172
buffer_capacity);
688
buffer_capacity = adjustbuffer(&buffer, buffer_length,
689
buffer_capacity);
1173
690
if(buffer_capacity == 0){
1174
int e = errno;
1175
perror_plus("incbuffer");
1176
errno = e;
1177
goto mandos_end;
1178
}
1179
1180
if(quit_now){
1181
errno = EINTR;
691
perror("adjustbuffer");
692
retval = -1;
1182
693
goto mandos_end;
1183
694
}
1184
695
1193
704
case GNUTLS_E_AGAIN:
1194
705
break;
1195
706
case GNUTLS_E_REHANDSHAKE:
1196
do {
707
do{
1197
708
ret = gnutls_handshake(session);
1198
1199
if(quit_now){
1200
errno = EINTR;
1201
goto mandos_end;
1202
}
1203
709
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1204
710
if(ret < 0){
1205
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1206
"***\n");
711
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1207
712
gnutls_perror(ret);
1208
errno = EPROTO;
713
retval = -1;
1209
714
goto mandos_end;
1210
715
}
1211
716
break;
1212
717
default:
1213
fprintf_plus(stderr, "Unknown error while reading data from"
1214
" encrypted session with Mandos server\n");
718
fprintf(stderr, "Unknown error while reading data from"
719
" encrypted session with Mandos server\n");
720
retval = -1;
1215
721
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1216
errno = EIO;
1217
722
goto mandos_end;
1218
723
}
1219
724
} else {
1222
727
}
1223
728
1224
729
if(debug){
1225
fprintf_plus(stderr, "Closing TLS session\n");
1226
}
1227
1228
if(quit_now){
1229
errno = EINTR;
1230
goto mandos_end;
1231
}
1232
1233
do {
1234
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1235
if(quit_now){
1236
errno = EINTR;
1237
goto mandos_end;
1238
}
1239
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
730
fprintf(stderr, "Closing TLS session\n");
731
}
732
733
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1240
734
1241
735
if(buffer_length > 0){
1242
ssize_t decrypted_buffer_size;
1243
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1244
&decrypted_buffer, mc);
736
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
737
buffer_length,
738
&decrypted_buffer);
1245
739
if(decrypted_buffer_size >= 0){
1246
1247
740
written = 0;
1248
741
while(written < (size_t) decrypted_buffer_size){
1249
if(quit_now){
1250
errno = EINTR;
1251
goto mandos_end;
1252
}
1253
1254
742
ret = (int)fwrite(decrypted_buffer + written, 1,
1255
743
(size_t)decrypted_buffer_size - written,
1256
744
stdout);
1257
745
if(ret == 0 and ferror(stdout)){
1258
int e = errno;
1259
746
if(debug){
1260
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1261
strerror(errno));
747
fprintf(stderr, "Error writing encrypted data: %s\n",
748
strerror(errno));
1262
749
}
1263
errno = e;
1264
goto mandos_end;
750
retval = -1;
751
break;
1265
752
}
1266
753
written += (size_t)ret;
1267
754
}
1268
retval = 0;
755
free(decrypted_buffer);
756
} else {
757
retval = -1;
1269
758
}
759
} else {
760
retval = -1;
1270
761
}
1271
762
1272
763
/* Shutdown procedure */
1273
764
1274
765
mandos_end:
1275
{
1276
if(route_added){
1277
if(not remove_local_route(ip, if_index)){
1278
fprintf_plus(stderr, "Failed to remove local route to %s on"
1279
" interface %d", ip, if_index);
1280
}
1281
}
1282
int e = errno;
1283
free(decrypted_buffer);
1284
free(buffer);
1285
if(tcp_sd >= 0){
1286
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1287
}
1288
if(ret == -1){
1289
if(e == 0){
1290
e = errno;
1291
}
1292
perror_plus("close");
1293
}
1294
gnutls_deinit(session);
1295
errno = e;
1296
if(quit_now){
1297
errno = EINTR;
1298
retval = -1;
1299
}
766
free(buffer);
767
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
768
if(ret == -1){
769
perror("close");
1300
770
}
771
gnutls_deinit(session);
1301
772
return retval;
1302
773
}
1303
774
1304
__attribute__((nonnull))
1305
775
static void resolve_callback(AvahiSServiceResolver *r,
1306
776
AvahiIfIndex interface,
1307
777
AvahiProtocol proto,
1315
785
AVAHI_GCC_UNUSED AvahiStringList *txt,
1316
786
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1317
787
flags,
1318
void *mc){
1319
if(r == NULL){
1320
return;
1321
}
788
void* userdata){
789
mandos_context *mc = userdata;
790
assert(r);
1322
791
1323
792
/* Called whenever a service has been resolved successfully or
1324
793
timed out */
1325
794
1326
if(quit_now){
1327
avahi_s_service_resolver_free(r);
1328
return;
1329
}
1330
1331
795
switch(event){
1332
796
default:
1333
797
case AVAHI_RESOLVER_FAILURE:
1334
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1335
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1336
domain,
1337
avahi_strerror(avahi_server_errno
1338
(((mandos_context*)mc)->server)));
798
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
799
" of type '%s' in domain '%s': %s\n", name, type, domain,
800
avahi_strerror(avahi_server_errno(mc->server)));
1339
801
break;
1340
802
1341
803
case AVAHI_RESOLVER_FOUND:
1343
805
char ip[AVAHI_ADDRESS_STR_MAX];
1344
806
avahi_address_snprint(ip, sizeof(ip), address);
1345
807
if(debug){
1346
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1347
PRIdMAX ") on port %" PRIu16 "\n", name,
1348
host_name, ip, (intmax_t)interface, port);
808
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
809
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
810
ip, (intmax_t)interface, port);
1349
811
}
1350
int ret = start_mandos_communication(ip, (in_port_t)port,
1351
interface,
1352
avahi_proto_to_af(proto),
1353
mc);
812
int ret = start_mandos_communication(ip, port, interface, mc,
813
avahi_proto_to_af(proto));
1354
814
if(ret == 0){
1355
avahi_simple_poll_quit(simple_poll);
1356
} else {
1357
if(not add_server(ip, (in_port_t)port, interface,
1358
avahi_proto_to_af(proto),
1359
&((mandos_context*)mc)->current_server)){
1360
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1361
" list\n", name);
1362
}
815
avahi_simple_poll_quit(mc->simple_poll);
1363
816
}
1364
817
}
1365
818
}
1375
828
const char *domain,
1376
829
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1377
830
flags,
1378
void *mc){
1379
if(b == NULL){
1380
return;
1381
}
831
void* userdata){
832
mandos_context *mc = userdata;
833
assert(b);
1382
834
1383
835
/* Called whenever a new services becomes available on the LAN or
1384
836
is removed from the LAN */
1385
837
1386
if(quit_now){
1387
return;
1388
}
1389
1390
838
switch(event){
1391
839
default:
1392
840
case AVAHI_BROWSER_FAILURE:
1393
841
1394
fprintf_plus(stderr, "(Avahi browser) %s\n",
1395
avahi_strerror(avahi_server_errno
1396
(((mandos_context*)mc)->server)));
1397
avahi_simple_poll_quit(simple_poll);
842
fprintf(stderr, "(Avahi browser) %s\n",
843
avahi_strerror(avahi_server_errno(mc->server)));
844
avahi_simple_poll_quit(mc->simple_poll);
1398
845
return;
1399
846
1400
847
case AVAHI_BROWSER_NEW:
1403
850
the callback function is called the Avahi server will free the
1404
851
resolver for us. */
1405
852
1406
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1407
interface, protocol, name, type,
1408
domain, protocol, 0,
1409
resolve_callback, mc) == NULL)
1410
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1411
" %s\n", name,
1412
avahi_strerror(avahi_server_errno
1413
(((mandos_context*)mc)->server)));
853
if(!(avahi_s_service_resolver_new(mc->server, interface,
854
protocol, name, type, domain,
855
AVAHI_PROTO_INET6, 0,
856
resolve_callback, mc)))
857
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
858
name, avahi_strerror(avahi_server_errno(mc->server)));
1414
859
break;
1415
860
1416
861
case AVAHI_BROWSER_REMOVE:
1419
864
case AVAHI_BROWSER_ALL_FOR_NOW:
1420
865
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1421
866
if(debug){
1422
fprintf_plus(stderr, "No Mandos server found, still"
1423
" searching...\n");
867
fprintf(stderr, "No Mandos server found, still searching...\n");
1424
868
}
1425
869
break;
1426
870
}
1427
871
}
1428
872
1429
/* Signal handler that stops main loop after SIGTERM */
1430
static void handle_sigterm(int sig){
1431
if(quit_now){
1432
return;
1433
}
1434
quit_now = 1;
1435
signal_received = sig;
1436
int old_errno = errno;
1437
/* set main loop to exit */
1438
if(simple_poll != NULL){
1439
avahi_simple_poll_quit(simple_poll);
1440
}
1441
errno = old_errno;
1442
}
1443
1444
__attribute__((nonnull, warn_unused_result))
1445
bool get_flags(const char *ifname, struct ifreq *ifr){
1446
int ret;
1447
error_t ret_errno;
1448
1449
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1450
if(s < 0){
1451
ret_errno = errno;
1452
perror_plus("socket");
1453
errno = ret_errno;
1454
return false;
1455
}
1456
strcpy(ifr->ifr_name, ifname);
1457
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1458
if(ret == -1){
1459
if(debug){
1460
ret_errno = errno;
1461
perror_plus("ioctl SIOCGIFFLAGS");
1462
errno = ret_errno;
1463
}
1464
return false;
1465
}
1466
return true;
1467
}
1468
1469
__attribute__((nonnull, warn_unused_result))
1470
bool good_flags(const char *ifname, const struct ifreq *ifr){
1471
1472
/* Reject the loopback device */
1473
if(ifr->ifr_flags & IFF_LOOPBACK){
1474
if(debug){
1475
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1476
ifname);
1477
}
1478
return false;
1479
}
1480
/* Accept point-to-point devices only if connect_to is specified */
1481
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1482
if(debug){
1483
fprintf_plus(stderr, "Accepting point-to-point interface"
1484
" \"%s\"\n", ifname);
1485
}
1486
return true;
1487
}
1488
/* Otherwise, reject non-broadcast-capable devices */
1489
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1490
if(debug){
1491
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1492
" \"%s\"\n", ifname);
1493
}
1494
return false;
1495
}
1496
/* Reject non-ARP interfaces (including dummy interfaces) */
1497
if(ifr->ifr_flags & IFF_NOARP){
1498
if(debug){
1499
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1500
ifname);
1501
}
1502
return false;
1503
}
1504
1505
/* Accept this device */
1506
if(debug){
1507
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1508
}
1509
return true;
1510
}
1511
1512
/*
1513
* This function determines if a directory entry in /sys/class/net
1514
* corresponds to an acceptable network device.
1515
* (This function is passed to scandir(3) as a filter function.)
1516
*/
1517
__attribute__((nonnull, warn_unused_result))
1518
int good_interface(const struct dirent *if_entry){
1519
if(if_entry->d_name[0] == '.'){
1520
return 0;
1521
}
1522
1523
struct ifreq ifr;
1524
if(not get_flags(if_entry->d_name, &ifr)){
1525
if(debug){
1526
fprintf_plus(stderr, "Failed to get flags for interface "
1527
"\"%s\"\n", if_entry->d_name);
1528
}
1529
return 0;
1530
}
1531
1532
if(not good_flags(if_entry->d_name, &ifr)){
1533
return 0;
1534
}
1535
return 1;
1536
}
1537
1538
/*
1539
* This function determines if a network interface is up.
1540
*/
1541
__attribute__((nonnull, warn_unused_result))
1542
bool interface_is_up(const char *interface){
1543
struct ifreq ifr;
1544
if(not get_flags(interface, &ifr)){
1545
if(debug){
1546
fprintf_plus(stderr, "Failed to get flags for interface "
1547
"\"%s\"\n", interface);
1548
}
1549
return false;
1550
}
1551
1552
return (bool)(ifr.ifr_flags & IFF_UP);
1553
}
1554
1555
/*
1556
* This function determines if a network interface is running
1557
*/
1558
__attribute__((nonnull, warn_unused_result))
1559
bool interface_is_running(const char *interface){
1560
struct ifreq ifr;
1561
if(not get_flags(interface, &ifr)){
1562
if(debug){
1563
fprintf_plus(stderr, "Failed to get flags for interface "
1564
"\"%s\"\n", interface);
1565
}
1566
return false;
1567
}
1568
1569
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1570
}
1571
1572
__attribute__((nonnull, pure, warn_unused_result))
1573
int notdotentries(const struct dirent *direntry){
1574
/* Skip "." and ".." */
1575
if(direntry->d_name[0] == '.'
1576
and (direntry->d_name[1] == '\0'
1577
or (direntry->d_name[1] == '.'
1578
and direntry->d_name[2] == '\0'))){
1579
return 0;
1580
}
1581
return 1;
1582
}
1583
1584
/* Is this directory entry a runnable program? */
1585
__attribute__((nonnull, warn_unused_result))
1586
int runnable_hook(const struct dirent *direntry){
1587
int ret;
1588
size_t sret;
1589
struct stat st;
1590
1591
if((direntry->d_name)[0] == '\0'){
1592
/* Empty name? */
1593
return 0;
1594
}
1595
1596
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1597
"abcdefghijklmnopqrstuvwxyz"
1598
"0123456789"
1599
"_.-");
1600
if((direntry->d_name)[sret] != '\0'){
1601
/* Contains non-allowed characters */
1602
if(debug){
1603
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1604
direntry->d_name);
1605
}
1606
return 0;
1607
}
1608
1609
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1610
if(ret == -1){
1611
if(debug){
1612
perror_plus("Could not stat hook");
1613
}
1614
return 0;
1615
}
1616
if(not (S_ISREG(st.st_mode))){
1617
/* Not a regular file */
1618
if(debug){
1619
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1620
direntry->d_name);
1621
}
1622
return 0;
1623
}
1624
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1625
/* Not executable */
1626
if(debug){
1627
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1628
direntry->d_name);
1629
}
1630
return 0;
1631
}
1632
if(debug){
1633
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1634
direntry->d_name);
1635
}
1636
return 1;
1637
}
1638
1639
__attribute__((nonnull, warn_unused_result))
1640
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1641
mandos_context *mc){
1642
int ret;
1643
struct timespec now;
1644
struct timespec waited_time;
1645
intmax_t block_time;
1646
1647
while(true){
1648
if(mc->current_server == NULL){
1649
if(debug){
1650
fprintf_plus(stderr, "Wait until first server is found."
1651
" No timeout!\n");
1652
}
1653
ret = avahi_simple_poll_iterate(s, -1);
1654
} else {
1655
if(debug){
1656
fprintf_plus(stderr, "Check current_server if we should run"
1657
" it, or wait\n");
1658
}
1659
/* the current time */
1660
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1661
if(ret == -1){
1662
perror_plus("clock_gettime");
1663
return -1;
1664
}
1665
/* Calculating in ms how long time between now and server
1666
who we visted longest time ago. Now - last seen. */
1667
waited_time.tv_sec = (now.tv_sec
1668
- mc->current_server->last_seen.tv_sec);
1669
waited_time.tv_nsec = (now.tv_nsec
1670
- mc->current_server->last_seen.tv_nsec);
1671
/* total time is 10s/10,000ms.
1672
Converting to s from ms by dividing by 1,000,
1673
and ns to ms by dividing by 1,000,000. */
1674
block_time = ((retry_interval
1675
- ((intmax_t)waited_time.tv_sec * 1000))
1676
- ((intmax_t)waited_time.tv_nsec / 1000000));
1677
1678
if(debug){
1679
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1680
block_time);
1681
}
1682
1683
if(block_time <= 0){
1684
ret = start_mandos_communication(mc->current_server->ip,
1685
mc->current_server->port,
1686
mc->current_server->if_index,
1687
mc->current_server->af, mc);
1688
if(ret == 0){
1689
avahi_simple_poll_quit(s);
1690
return 0;
1691
}
1692
ret = clock_gettime(CLOCK_MONOTONIC,
1693
&mc->current_server->last_seen);
1694
if(ret == -1){
1695
perror_plus("clock_gettime");
1696
return -1;
1697
}
1698
mc->current_server = mc->current_server->next;
1699
block_time = 0; /* Call avahi to find new Mandos
1700
servers, but don't block */
1701
}
1702
1703
ret = avahi_simple_poll_iterate(s, (int)block_time);
1704
}
1705
if(ret != 0){
1706
if(ret > 0 or errno != EINTR){
1707
return (ret != 1) ? ret : 0;
1708
}
1709
}
1710
}
1711
}
1712
1713
__attribute__((nonnull))
1714
void run_network_hooks(const char *mode, const char *interface,
1715
const float delay){
1716
struct dirent **direntries = NULL;
1717
if(hookdir_fd == -1){
1718
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1719
| O_CLOEXEC);
1720
if(hookdir_fd == -1){
1721
if(errno == ENOENT){
1722
if(debug){
1723
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1724
" found\n", hookdir);
1725
}
1726
} else {
1727
perror_plus("open");
1728
}
1729
return;
1730
}
1731
}
1732
#ifdef __GLIBC__
1733
#if __GLIBC_PREREQ(2, 15)
1734
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1735
runnable_hook, alphasort);
1736
#else /* not __GLIBC_PREREQ(2, 15) */
1737
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1738
alphasort);
1739
#endif /* not __GLIBC_PREREQ(2, 15) */
1740
#else /* not __GLIBC__ */
1741
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1742
alphasort);
1743
#endif /* not __GLIBC__ */
1744
if(numhooks == -1){
1745
perror_plus("scandir");
1746
return;
1747
}
1748
struct dirent *direntry;
1749
int ret;
1750
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1751
if(devnull == -1){
1752
perror_plus("open(\"/dev/null\", O_RDONLY)");
1753
return;
1754
}
1755
for(int i = 0; i < numhooks; i++){
1756
direntry = direntries[i];
1757
if(debug){
1758
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1759
direntry->d_name);
1760
}
1761
pid_t hook_pid = fork();
1762
if(hook_pid == 0){
1763
/* Child */
1764
/* Raise privileges */
1765
errno = raise_privileges_permanently();
1766
if(errno != 0){
1767
perror_plus("Failed to raise privileges");
1768
_exit(EX_NOPERM);
1769
}
1770
/* Set group */
1771
errno = 0;
1772
ret = setgid(0);
1773
if(ret == -1){
1774
perror_plus("setgid");
1775
_exit(EX_NOPERM);
1776
}
1777
/* Reset supplementary groups */
1778
errno = 0;
1779
ret = setgroups(0, NULL);
1780
if(ret == -1){
1781
perror_plus("setgroups");
1782
_exit(EX_NOPERM);
1783
}
1784
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1785
if(ret == -1){
1786
perror_plus("setenv");
1787
_exit(EX_OSERR);
1788
}
1789
ret = setenv("DEVICE", interface, 1);
1790
if(ret == -1){
1791
perror_plus("setenv");
1792
_exit(EX_OSERR);
1793
}
1794
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1795
if(ret == -1){
1796
perror_plus("setenv");
1797
_exit(EX_OSERR);
1798
}
1799
ret = setenv("MODE", mode, 1);
1800
if(ret == -1){
1801
perror_plus("setenv");
1802
_exit(EX_OSERR);
1803
}
1804
char *delaystring;
1805
ret = asprintf(&delaystring, "%f", (double)delay);
1806
if(ret == -1){
1807
perror_plus("asprintf");
1808
_exit(EX_OSERR);
1809
}
1810
ret = setenv("DELAY", delaystring, 1);
1811
if(ret == -1){
1812
free(delaystring);
1813
perror_plus("setenv");
1814
_exit(EX_OSERR);
1815
}
1816
free(delaystring);
1817
if(connect_to != NULL){
1818
ret = setenv("CONNECT", connect_to, 1);
1819
if(ret == -1){
1820
perror_plus("setenv");
1821
_exit(EX_OSERR);
1822
}
1823
}
1824
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1825
direntry->d_name,
1826
O_RDONLY));
1827
if(hook_fd == -1){
1828
perror_plus("openat");
1829
_exit(EXIT_FAILURE);
1830
}
1831
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1832
perror_plus("close");
1833
_exit(EXIT_FAILURE);
1834
}
1835
ret = dup2(devnull, STDIN_FILENO);
1836
if(ret == -1){
1837
perror_plus("dup2(devnull, STDIN_FILENO)");
1838
_exit(EX_OSERR);
1839
}
1840
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1841
if(ret == -1){
1842
perror_plus("close");
1843
_exit(EX_OSERR);
1844
}
1845
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1846
if(ret == -1){
1847
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1848
_exit(EX_OSERR);
1849
}
1850
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1851
environ) == -1){
1852
perror_plus("fexecve");
1853
_exit(EXIT_FAILURE);
1854
}
1855
} else {
1856
if(hook_pid == -1){
1857
perror_plus("fork");
1858
free(direntry);
1859
continue;
1860
}
1861
int status;
1862
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1863
perror_plus("waitpid");
1864
free(direntry);
1865
continue;
1866
}
1867
if(WIFEXITED(status)){
1868
if(WEXITSTATUS(status) != 0){
1869
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1870
" with status %d\n", direntry->d_name,
1871
WEXITSTATUS(status));
1872
free(direntry);
1873
continue;
1874
}
1875
} else if(WIFSIGNALED(status)){
1876
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1877
" signal %d\n", direntry->d_name,
1878
WTERMSIG(status));
1879
free(direntry);
1880
continue;
1881
} else {
1882
fprintf_plus(stderr, "Warning: network hook \"%s\""
1883
" crashed\n", direntry->d_name);
1884
free(direntry);
1885
continue;
1886
}
1887
}
1888
if(debug){
1889
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1890
direntry->d_name);
1891
}
1892
free(direntry);
1893
}
1894
free(direntries);
1895
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1896
perror_plus("close");
1897
} else {
1898
hookdir_fd = -1;
1899
}
1900
close(devnull);
1901
}
1902
1903
__attribute__((nonnull, warn_unused_result))
1904
error_t bring_up_interface(const char *const interface,
1905
const float delay){
1906
error_t old_errno = errno;
1907
int ret;
1908
struct ifreq network;
1909
unsigned int if_index = if_nametoindex(interface);
1910
if(if_index == 0){
1911
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1912
errno = old_errno;
1913
return ENXIO;
1914
}
1915
1916
if(quit_now){
1917
errno = old_errno;
1918
return EINTR;
1919
}
1920
1921
if(not interface_is_up(interface)){
1922
error_t ret_errno = 0, ioctl_errno = 0;
1923
if(not get_flags(interface, &network)){
1924
ret_errno = errno;
1925
fprintf_plus(stderr, "Failed to get flags for interface "
1926
"\"%s\"\n", interface);
1927
errno = old_errno;
1928
return ret_errno;
1929
}
1930
network.ifr_flags |= IFF_UP; /* set flag */
1931
1932
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
if(sd == -1){
1934
ret_errno = errno;
1935
perror_plus("socket");
1936
errno = old_errno;
1937
return ret_errno;
1938
}
1939
1940
if(quit_now){
1941
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1942
if(ret == -1){
1943
perror_plus("close");
1944
}
1945
errno = old_errno;
1946
return EINTR;
1947
}
1948
1949
if(debug){
1950
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1951
interface);
1952
}
1953
1954
/* Raise privileges */
1955
ret_errno = raise_privileges();
1956
if(ret_errno != 0){
1957
errno = ret_errno;
1958
perror_plus("Failed to raise privileges");
1959
}
1960
1961
#ifdef __linux__
1962
int ret_linux;
1963
bool restore_loglevel = false;
1964
if(ret_errno == 0){
1965
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1966
messages about the network interface to mess up the prompt */
1967
ret_linux = klogctl(8, NULL, 5);
1968
if(ret_linux == -1){
1969
perror_plus("klogctl");
1970
} else {
1971
restore_loglevel = true;
1972
}
1973
}
1974
#endif /* __linux__ */
1975
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1976
ioctl_errno = errno;
1977
#ifdef __linux__
1978
if(restore_loglevel){
1979
ret_linux = klogctl(7, NULL, 0);
1980
if(ret_linux == -1){
1981
perror_plus("klogctl");
1982
}
1983
}
1984
#endif /* __linux__ */
1985
1986
/* If raise_privileges() succeeded above */
1987
if(ret_errno == 0){
1988
/* Lower privileges */
1989
ret_errno = lower_privileges();
1990
if(ret_errno != 0){
1991
errno = ret_errno;
1992
perror_plus("Failed to lower privileges");
1993
}
1994
}
1995
1996
/* Close the socket */
1997
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1998
if(ret == -1){
1999
perror_plus("close");
2000
}
2001
2002
if(ret_setflags == -1){
2003
errno = ioctl_errno;
2004
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2005
errno = old_errno;
2006
return ioctl_errno;
2007
}
2008
} else if(debug){
2009
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2010
interface);
2011
}
2012
2013
/* Sleep checking until interface is running.
2014
Check every 0.25s, up to total time of delay */
2015
for(int i=0; i < delay * 4; i++){
2016
if(interface_is_running(interface)){
2017
break;
2018
}
2019
struct timespec sleeptime = { .tv_nsec = 250000000 };
2020
ret = nanosleep(&sleeptime, NULL);
2021
if(ret == -1 and errno != EINTR){
2022
perror_plus("nanosleep");
2023
}
2024
}
2025
2026
errno = old_errno;
2027
return 0;
2028
}
2029
2030
__attribute__((nonnull, warn_unused_result))
2031
error_t take_down_interface(const char *const interface){
2032
error_t old_errno = errno;
2033
struct ifreq network;
2034
unsigned int if_index = if_nametoindex(interface);
2035
if(if_index == 0){
2036
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2037
errno = old_errno;
2038
return ENXIO;
2039
}
2040
if(interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2042
if(not get_flags(interface, &network) and debug){
2043
ret_errno = errno;
2044
fprintf_plus(stderr, "Failed to get flags for interface "
2045
"\"%s\"\n", interface);
2046
errno = old_errno;
2047
return ret_errno;
2048
}
2049
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2050
2051
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2052
if(sd == -1){
2053
ret_errno = errno;
2054
perror_plus("socket");
2055
errno = old_errno;
2056
return ret_errno;
2057
}
2058
2059
if(debug){
2060
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2061
interface);
2062
}
2063
2064
/* Raise privileges */
2065
ret_errno = raise_privileges();
2066
if(ret_errno != 0){
2067
errno = ret_errno;
2068
perror_plus("Failed to raise privileges");
2069
}
2070
2071
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2072
ioctl_errno = errno;
2073
2074
/* If raise_privileges() succeeded above */
2075
if(ret_errno == 0){
2076
/* Lower privileges */
2077
ret_errno = lower_privileges();
2078
if(ret_errno != 0){
2079
errno = ret_errno;
2080
perror_plus("Failed to lower privileges");
2081
}
2082
}
2083
2084
/* Close the socket */
2085
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2086
if(ret == -1){
2087
perror_plus("close");
2088
}
2089
2090
if(ret_setflags == -1){
2091
errno = ioctl_errno;
2092
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2093
errno = old_errno;
2094
return ioctl_errno;
2095
}
2096
} else if(debug){
2097
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2098
interface);
2099
}
2100
2101
errno = old_errno;
2102
return 0;
2103
}
2104
2105
873
int main(int argc, char *argv[]){
2106
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2107
.priority = "SECURE256:!CTYPE-X.509:"
2108
"+CTYPE-OPENPGP", .current_server = NULL,
2109
.interfaces = NULL, .interfaces_size = 0 };
2110
874
AvahiSServiceBrowser *sb = NULL;
2111
error_t ret_errno;
875
int error;
2112
876
int ret;
2113
877
intmax_t tmpmax;
2114
char *tmp;
878
int numchars;
2115
879
int exitcode = EXIT_SUCCESS;
2116
char *interfaces_to_take_down = NULL;
2117
size_t interfaces_to_take_down_size = 0;
2118
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2119
char old_tempdir[] = "/tmp/mandosXXXXXX";
2120
char *tempdir = NULL;
880
const char *interface = "eth0";
881
struct ifreq network;
882
int sd;
883
uid_t uid;
884
gid_t gid;
885
char *connect_to = NULL;
886
char tempdir[] = "/tmp/mandosXXXXXX";
887
bool tempdir_created = false;
2121
888
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2122
889
const char *seckey = PATHDIR "/" SECKEY;
2123
890
const char *pubkey = PATHDIR "/" PUBKEY;
2124
char *interfaces_hooks = NULL;
2125
891
892
mandos_context mc = { .simple_poll = NULL, .server = NULL,
893
.dh_bits = 1024, .priority = "SECURE256"
894
":!CTYPE-X.509:+CTYPE-OPENPGP" };
2126
895
bool gnutls_initialized = false;
2127
896
bool gpgme_initialized = false;
2128
float delay = 2.5f;
2129
double retry_interval = 10; /* 10s between trying a server and
2130
retrying the same server again */
2131
2132
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2133
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2134
2135
uid = getuid();
2136
gid = getgid();
2137
2138
/* Lower any group privileges we might have, just to be safe */
2139
errno = 0;
2140
ret = setgid(gid);
2141
if(ret == -1){
2142
perror_plus("setgid");
2143
}
2144
2145
/* Lower user privileges (temporarily) */
2146
errno = 0;
2147
ret = seteuid(uid);
2148
if(ret == -1){
2149
perror_plus("seteuid");
2150
}
2151
2152
if(quit_now){
2153
goto end;
2154
}
897
double delay = 2.5;
2155
898
2156
899
{
2157
900
struct argp_option options[] = {
2187
930
.arg = "SECONDS",
2188
931
.doc = "Maximum delay to wait for interface startup",
2189
932
.group = 2 },
2190
{ .name = "retry", .key = 132,
2191
.arg = "SECONDS",
2192
.doc = "Retry interval used when denied by the Mandos server",
2193
.group = 2 },
2194
{ .name = "network-hook-dir", .key = 133,
2195
.arg = "DIR",
2196
.doc = "Directory where network hooks are located",
2197
.group = 2 },
2198
/*
2199
* These reproduce what we would get without ARGP_NO_HELP
2200
*/
2201
{ .name = "help", .key = '?',
2202
.doc = "Give this help list", .group = -1 },
2203
{ .name = "usage", .key = -3,
2204
.doc = "Give a short usage message", .group = -1 },
2205
{ .name = "version", .key = 'V',
2206
.doc = "Print program version", .group = -1 },
2207
933
{ .name = NULL }
2208
934
};
2209
935
2210
936
error_t parse_opt(int key, char *arg,
2211
937
struct argp_state *state){
2212
errno = 0;
2213
938
switch(key){
2214
939
case 128: /* --debug */
2215
940
debug = true;
2218
943
connect_to = arg;
2219
944
break;
2220
945
case 'i': /* --interface */
2221
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2222
arg, (int)',');
2223
if(ret_errno != 0){
2224
argp_error(state, "%s", strerror(ret_errno));
2225
}
946
interface = arg;
2226
947
break;
2227
948
case 's': /* --seckey */
2228
949
seckey = arg;
2231
952
pubkey = arg;
2232
953
break;
2233
954
case 129: /* --dh-bits */
2234
errno = 0;
2235
tmpmax = strtoimax(arg, &tmp, 10);
2236
if(errno != 0 or tmp == arg or *tmp != '\0'
2237
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2238
argp_error(state, "Bad number of DH bits");
955
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
956
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
957
or arg[numchars] != '\0'){
958
fprintf(stderr, "Bad number of DH bits\n");
959
exit(EXIT_FAILURE);
2239
960
}
2240
961
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2241
962
break;
2243
964
mc.priority = arg;
2244
965
break;
2245
966
case 131: /* --delay */
2246
errno = 0;
2247
delay = strtof(arg, &tmp);
2248
if(errno != 0 or tmp == arg or *tmp != '\0'){
2249
argp_error(state, "Bad delay");
2250
}
2251
case 132: /* --retry */
2252
errno = 0;
2253
retry_interval = strtod(arg, &tmp);
2254
if(errno != 0 or tmp == arg or *tmp != '\0'
2255
or (retry_interval * 1000) > INT_MAX
2256
or retry_interval < 0){
2257
argp_error(state, "Bad retry interval");
2258
}
2259
break;
2260
case 133: /* --network-hook-dir */
2261
hookdir = arg;
2262
break;
2263
/*
2264
* These reproduce what we would get without ARGP_NO_HELP
2265
*/
2266
case '?': /* --help */
2267
argp_state_help(state, state->out_stream,
2268
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2269
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2270
case -3: /* --usage */
2271
argp_state_help(state, state->out_stream,
2272
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2273
case 'V': /* --version */
2274
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2275
exit(argp_err_exit_status);
967
ret = sscanf(arg, "%lf%n", &delay, &numchars);
968
if(ret < 1 or arg[numchars] != '\0'){
969
fprintf(stderr, "Bad delay\n");
970
exit(EXIT_FAILURE);
971
}
972
break;
973
case ARGP_KEY_ARG:
974
argp_usage(state);
975
case ARGP_KEY_END:
2276
976
break;
2277
977
default:
2278
978
return ARGP_ERR_UNKNOWN;
2279
979
}
2280
return errno;
980
return 0;
2281
981
}
2282
982
2283
983
struct argp argp = { .options = options, .parser = parse_opt,
2284
984
.args_doc = "",
2285
985
.doc = "Mandos client -- Get and decrypt"
2286
986
" passwords from a Mandos server" };
2287
ret = argp_parse(&argp, argc, argv,
2288
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2289
switch(ret){
2290
case 0:
2291
break;
2292
case ENOMEM:
2293
default:
2294
errno = ret;
2295
perror_plus("argp_parse");
2296
exitcode = EX_OSERR;
2297
goto end;
2298
case EINVAL:
2299
exitcode = EX_USAGE;
987
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
988
if(ret == ARGP_ERR_UNKNOWN){
989
fprintf(stderr, "Unknown error while parsing arguments\n");
990
exitcode = EXIT_FAILURE;
2300
991
goto end;
2301
992
}
2302
993
}
2303
994
2304
{
2305
/* Work around Debian bug #633582:
2306
<http://bugs.debian.org/633582> */
995
/* If the interface is down, bring it up */
996
if(interface[0] != '\0'){
997
#ifdef __linux__
998
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
999
messages to mess up the prompt */
1000
ret = klogctl(8, NULL, 5);
1001
bool restore_loglevel = true;
1002
if(ret == -1){
1003
restore_loglevel = false;
1004
perror("klogctl");
1005
}
1006
#endif
2307
1007
2308
/* Re-raise privileges */
2309
ret_errno = raise_privileges();
2310
if(ret_errno != 0){
2311
errno = ret_errno;
2312
perror_plus("Failed to raise privileges");
2313
} else {
2314
struct stat st;
2315
2316
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2317
int seckey_fd = open(seckey, O_RDONLY);
2318
if(seckey_fd == -1){
2319
perror_plus("open");
2320
} else {
2321
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2322
if(ret == -1){
2323
perror_plus("fstat");
2324
} else {
2325
if(S_ISREG(st.st_mode)
2326
and st.st_uid == 0 and st.st_gid == 0){
2327
ret = fchown(seckey_fd, uid, gid);
2328
if(ret == -1){
2329
perror_plus("fchown");
2330
}
2331
}
2332
}
2333
TEMP_FAILURE_RETRY(close(seckey_fd));
2334
}
2335
}
2336
2337
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2338
int pubkey_fd = open(pubkey, O_RDONLY);
2339
if(pubkey_fd == -1){
2340
perror_plus("open");
2341
} else {
2342
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2343
if(ret == -1){
2344
perror_plus("fstat");
2345
} else {
2346
if(S_ISREG(st.st_mode)
2347
and st.st_uid == 0 and st.st_gid == 0){
2348
ret = fchown(pubkey_fd, uid, gid);
2349
if(ret == -1){
2350
perror_plus("fchown");
2351
}
2352
}
2353
}
2354
TEMP_FAILURE_RETRY(close(pubkey_fd));
2355
}
2356
}
2357
2358
/* Lower privileges */
2359
ret_errno = lower_privileges();
2360
if(ret_errno != 0){
2361
errno = ret_errno;
2362
perror_plus("Failed to lower privileges");
2363
}
2364
}
2365
}
2366
2367
/* Remove invalid interface names (except "none") */
2368
{
2369
char *interface = NULL;
2370
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2371
interface))){
2372
if(strcmp(interface, "none") != 0
2373
and if_nametoindex(interface) == 0){
2374
if(interface[0] != '\0'){
2375
fprintf_plus(stderr, "Not using nonexisting interface"
2376
" \"%s\"\n", interface);
2377
}
2378
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2379
interface = NULL;
2380
}
2381
}
2382
}
2383
2384
/* Run network hooks */
2385
{
2386
if(mc.interfaces != NULL){
2387
interfaces_hooks = malloc(mc.interfaces_size);
2388
if(interfaces_hooks == NULL){
2389
perror_plus("malloc");
1008
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1009
if(sd < 0){
1010
perror("socket");
1011
exitcode = EXIT_FAILURE;
1012
#ifdef __linux__
1013
if(restore_loglevel){
1014
ret = klogctl(7, NULL, 0);
1015
if(ret == -1){
1016
perror("klogctl");
1017
}
1018
}
1019
#endif
1020
goto end;
1021
}
1022
strcpy(network.ifr_name, interface);
1023
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1024
if(ret == -1){
1025
perror("ioctl SIOCGIFFLAGS");
1026
#ifdef __linux__
1027
if(restore_loglevel){
1028
ret = klogctl(7, NULL, 0);
1029
if(ret == -1){
1030
perror("klogctl");
1031
}
1032
}
1033
#endif
1034
exitcode = EXIT_FAILURE;
1035
goto end;
1036
}
1037
if((network.ifr_flags & IFF_UP) == 0){
1038
network.ifr_flags |= IFF_UP;
1039
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1040
if(ret == -1){
1041
perror("ioctl SIOCSIFFLAGS");
1042
exitcode = EXIT_FAILURE;
1043
#ifdef __linux__
1044
if(restore_loglevel){
1045
ret = klogctl(7, NULL, 0);
1046
if(ret == -1){
1047
perror("klogctl");
1048
}
1049
}
1050
#endif
2390
1051
goto end;
2391
1052
}
2392
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2393
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2394
}
2395
run_network_hooks("start", interfaces_hooks != NULL ?
2396
interfaces_hooks : "", delay);
2397
}
2398
2399
if(not debug){
2400
avahi_set_log_function(empty_log);
2401
}
2402
2403
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2404
from the signal handler */
2405
/* Initialize the pseudo-RNG for Avahi */
2406
srand((unsigned int) time(NULL));
2407
simple_poll = avahi_simple_poll_new();
2408
if(simple_poll == NULL){
2409
fprintf_plus(stderr,
2410
"Avahi: Failed to create simple poll object.\n");
2411
exitcode = EX_UNAVAILABLE;
2412
goto end;
2413
}
2414
2415
sigemptyset(&sigterm_action.sa_mask);
2416
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2417
if(ret == -1){
2418
perror_plus("sigaddset");
2419
exitcode = EX_OSERR;
2420
goto end;
2421
}
2422
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2423
if(ret == -1){
2424
perror_plus("sigaddset");
2425
exitcode = EX_OSERR;
2426
goto end;
2427
}
2428
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2429
if(ret == -1){
2430
perror_plus("sigaddset");
2431
exitcode = EX_OSERR;
2432
goto end;
2433
}
2434
/* Need to check if the handler is SIG_IGN before handling:
2435
| [[info:libc:Initial Signal Actions]] |
2436
| [[info:libc:Basic Signal Handling]] |
2437
*/
2438
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2439
if(ret == -1){
2440
perror_plus("sigaction");
2441
return EX_OSERR;
2442
}
2443
if(old_sigterm_action.sa_handler != SIG_IGN){
2444
ret = sigaction(SIGINT, &sigterm_action, NULL);
2445
if(ret == -1){
2446
perror_plus("sigaction");
2447
exitcode = EX_OSERR;
2448
goto end;
2449
}
2450
}
2451
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2452
if(ret == -1){
2453
perror_plus("sigaction");
2454
return EX_OSERR;
2455
}
2456
if(old_sigterm_action.sa_handler != SIG_IGN){
2457
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2458
if(ret == -1){
2459
perror_plus("sigaction");
2460
exitcode = EX_OSERR;
2461
goto end;
2462
}
2463
}
2464
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2465
if(ret == -1){
2466
perror_plus("sigaction");
2467
return EX_OSERR;
2468
}
2469
if(old_sigterm_action.sa_handler != SIG_IGN){
2470
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2471
if(ret == -1){
2472
perror_plus("sigaction");
2473
exitcode = EX_OSERR;
2474
goto end;
2475
}
2476
}
2477
2478
/* If no interfaces were specified, make a list */
2479
if(mc.interfaces == NULL){
2480
struct dirent **direntries = NULL;
2481
/* Look for any good interfaces */
2482
ret = scandir(sys_class_net, &direntries, good_interface,
2483
alphasort);
2484
if(ret >= 1){
2485
/* Add all found interfaces to interfaces list */
2486
for(int i = 0; i < ret; ++i){
2487
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2488
direntries[i]->d_name);
2489
if(ret_errno != 0){
2490
errno = ret_errno;
2491
perror_plus("argz_add");
2492
free(direntries[i]);
2493
continue;
2494
}
2495
if(debug){
2496
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2497
direntries[i]->d_name);
2498
}
2499
free(direntries[i]);
2500
}
2501
free(direntries);
2502
} else {
2503
if(ret == 0){
2504
free(direntries);
2505
}
2506
fprintf_plus(stderr, "Could not find a network interface\n");
2507
exitcode = EXIT_FAILURE;
2508
goto end;
2509
}
2510
}
2511
2512
/* Bring up interfaces which are down, and remove any "none"s */
2513
{
2514
char *interface = NULL;
2515
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2516
interface))){
2517
/* If interface name is "none", stop bringing up interfaces.
2518
Also remove all instances of "none" from the list */
2519
if(strcmp(interface, "none") == 0){
2520
argz_delete(&mc.interfaces, &mc.interfaces_size,
2521
interface);
2522
interface = NULL;
2523
while((interface = argz_next(mc.interfaces,
2524
mc.interfaces_size, interface))){
2525
if(strcmp(interface, "none") == 0){
2526
argz_delete(&mc.interfaces, &mc.interfaces_size,
2527
interface);
2528
interface = NULL;
2529
}
2530
}
1053
}
1054
/* sleep checking until interface is running */
1055
for(int i=0; i < delay * 4; i++){
1056
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1057
if(ret == -1){
1058
perror("ioctl SIOCGIFFLAGS");
1059
} else if(network.ifr_flags & IFF_RUNNING){
2531
1060
break;
2532
1061
}
2533
bool interface_was_up = interface_is_up(interface);
2534
errno = bring_up_interface(interface, delay);
2535
if(not interface_was_up){
2536
if(errno != 0){
2537
perror_plus("Failed to bring up interface");
2538
} else {
2539
errno = argz_add(&interfaces_to_take_down,
2540
&interfaces_to_take_down_size,
2541
interface);
2542
if(errno != 0){
2543
perror_plus("argz_add");
2544
}
2545
}
2546
}
2547
}
2548
if(debug and (interfaces_to_take_down == NULL)){
2549
fprintf_plus(stderr, "No interfaces were brought up\n");
2550
}
2551
}
2552
2553
/* If we only got one interface, explicitly use only that one */
2554
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2555
if(debug){
2556
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2557
mc.interfaces);
2558
}
2559
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2560
}
2561
2562
if(quit_now){
2563
goto end;
2564
}
2565
2566
ret = init_gnutls_global(pubkey, seckey, &mc);
2567
if(ret == -1){
2568
fprintf_plus(stderr, "init_gnutls_global failed\n");
2569
exitcode = EX_UNAVAILABLE;
1062
struct timespec sleeptime = { .tv_nsec = 250000000 };
1063
ret = nanosleep(&sleeptime, NULL);
1064
if(ret == -1 and errno != EINTR){
1065
perror("nanosleep");
1066
}
1067
}
1068
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1069
if(ret == -1){
1070
perror("close");
1071
}
1072
#ifdef __linux__
1073
if(restore_loglevel){
1074
/* Restores kernel loglevel to default */
1075
ret = klogctl(7, NULL, 0);
1076
if(ret == -1){
1077
perror("klogctl");
1078
}
1079
}
1080
#endif
1081
}
1082
1083
uid = getuid();
1084
gid = getgid();
1085
1086
errno = 0;
1087
setgid(gid);
1088
if(ret == -1){
1089
perror("setgid");
1090
}
1091
1092
ret = setuid(uid);
1093
if(ret == -1){
1094
perror("setuid");
1095
}
1096
1097
ret = init_gnutls_global(&mc, pubkey, seckey);
1098
if(ret == -1){
1099
fprintf(stderr, "init_gnutls_global failed\n");
1100
exitcode = EXIT_FAILURE;
2570
1101
goto end;
2571
1102
} else {
2572
1103
gnutls_initialized = true;
2573
1104
}
2574
1105
2575
if(quit_now){
2576
goto end;
2577
}
2578
2579
/* Try /run/tmp before /tmp */
2580
tempdir = mkdtemp(run_tempdir);
2581
if(tempdir == NULL and errno == ENOENT){
2582
if(debug){
2583
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2584
run_tempdir, old_tempdir);
2585
}
2586
tempdir = mkdtemp(old_tempdir);
2587
}
2588
if(tempdir == NULL){
2589
perror_plus("mkdtemp");
2590
goto end;
2591
}
2592
2593
if(quit_now){
2594
goto end;
2595
}
2596
2597
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2598
fprintf_plus(stderr, "init_gpgme failed\n");
2599
exitcode = EX_UNAVAILABLE;
1106
if(mkdtemp(tempdir) == NULL){
1107
perror("mkdtemp");
1108
goto end;
1109
}
1110
tempdir_created = true;
1111
1112
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1113
fprintf(stderr, "init_gpgme failed\n");
1114
exitcode = EXIT_FAILURE;
2600
1115
goto end;
2601
1116
} else {
2602
1117
gpgme_initialized = true;
2603
1118
}
2604
1119
2605
if(quit_now){
2606
goto end;
1120
if(interface[0] != '\0'){
1121
if_index = (AvahiIfIndex) if_nametoindex(interface);
1122
if(if_index == 0){
1123
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1124
exitcode = EXIT_FAILURE;
1125
goto end;
1126
}
2607
1127
}
2608
1128
2609
1129
if(connect_to != NULL){
2610
1130
/* Connect directly, do not use Zeroconf */
2611
1131
/* (Mainly meant for debugging) */
2612
1132
char *address = strrchr(connect_to, ':');
2613
2614
1133
if(address == NULL){
2615
fprintf_plus(stderr, "No colon in address\n");
2616
exitcode = EX_USAGE;
2617
goto end;
2618
}
2619
2620
if(quit_now){
2621
goto end;
2622
}
2623
2624
in_port_t port;
2625
errno = 0;
2626
tmpmax = strtoimax(address+1, &tmp, 10);
2627
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2628
or tmpmax != (in_port_t)tmpmax){
2629
fprintf_plus(stderr, "Bad port number\n");
2630
exitcode = EX_USAGE;
2631
goto end;
2632
}
2633
2634
if(quit_now){
2635
goto end;
2636
}
2637
2638
port = (in_port_t)tmpmax;
1134
fprintf(stderr, "No colon in address\n");
1135
exitcode = EXIT_FAILURE;
1136
goto end;
1137
}
1138
uint16_t port;
1139
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1140
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1141
or address[numchars+1] != '\0'){
1142
fprintf(stderr, "Bad port number\n");
1143
exitcode = EXIT_FAILURE;
1144
goto end;
1145
}
1146
port = (uint16_t)tmpmax;
2639
1147
*address = '\0';
1148
address = connect_to;
2640
1149
/* Colon in address indicates IPv6 */
2641
1150
int af;
2642
if(strchr(connect_to, ':') != NULL){
1151
if(strchr(address, ':') != NULL){
2643
1152
af = AF_INET6;
2644
/* Accept [] around IPv6 address - see RFC 5952 */
2645
if(connect_to[0] == '[' and address[-1] == ']')
2646
{
2647
connect_to++;
2648
address[-1] = '\0';
2649
}
2650
1153
} else {
2651
1154
af = AF_INET;
2652
1155
}
2653
address = connect_to;
2654
2655
if(quit_now){
2656
goto end;
2657
}
2658
2659
while(not quit_now){
2660
ret = start_mandos_communication(address, port, if_index, af,
2661
&mc);
2662
if(quit_now or ret == 0){
2663
break;
2664
}
2665
if(debug){
2666
fprintf_plus(stderr, "Retrying in %d seconds\n",
2667
(int)retry_interval);
2668
}
2669
sleep((unsigned int)retry_interval);
2670
}
2671
2672
if(not quit_now){
1156
ret = start_mandos_communication(address, port, if_index, &mc,
1157
af);
1158
if(ret < 0){
1159
exitcode = EXIT_FAILURE;
1160
} else {
2673
1161
exitcode = EXIT_SUCCESS;
2674
1162
}
2675
2676
1163
goto end;
2677
1164
}
2678
1165
2679
if(quit_now){
1166
if(not debug){
1167
avahi_set_log_function(empty_log);
1168
}
1169
1170
/* Initialize the pseudo-RNG for Avahi */
1171
srand((unsigned int) time(NULL));
1172
1173
/* Allocate main Avahi loop object */
1174
mc.simple_poll = avahi_simple_poll_new();
1175
if(mc.simple_poll == NULL){
1176
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1177
exitcode = EXIT_FAILURE;
2680
1178
goto end;
2681
1179
}
2682
1180
2690
1188
config.publish_domain = 0;
2691
1189
2692
1190
/* Allocate a new server */
2693
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2694
&config, NULL, NULL, &ret_errno);
1191
mc.server = avahi_server_new(avahi_simple_poll_get
1192
(mc.simple_poll), &config, NULL,
1193
NULL, &error);
2695
1194
2696
1195
/* Free the Avahi configuration data */
2697
1196
avahi_server_config_free(&config);
2699
1198
2700
1199
/* Check if creating the Avahi server object succeeded */
2701
1200
if(mc.server == NULL){
2702
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2703
avahi_strerror(ret_errno));
2704
exitcode = EX_UNAVAILABLE;
2705
goto end;
2706
}
2707
2708
if(quit_now){
1201
fprintf(stderr, "Failed to create Avahi server: %s\n",
1202
avahi_strerror(error));
1203
exitcode = EXIT_FAILURE;
2709
1204
goto end;
2710
1205
}
2711
1206
2712
1207
/* Create the Avahi service browser */
2713
1208
sb = avahi_s_service_browser_new(mc.server, if_index,
2714
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2715
NULL, 0, browse_callback,
2716
(void *)&mc);
1209
AVAHI_PROTO_INET6, "_mandos._tcp",
1210
NULL, 0, browse_callback, &mc);
2717
1211
if(sb == NULL){
2718
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2719
avahi_strerror(avahi_server_errno(mc.server)));
2720
exitcode = EX_UNAVAILABLE;
2721
goto end;
2722
}
2723
2724
if(quit_now){
1212
fprintf(stderr, "Failed to create service browser: %s\n",
1213
avahi_strerror(avahi_server_errno(mc.server)));
1214
exitcode = EXIT_FAILURE;
2725
1215
goto end;
2726
1216
}
2727
1217
2728
1218
/* Run the main loop */
2729
1219
2730
1220
if(debug){
2731
fprintf_plus(stderr, "Starting Avahi loop search\n");
1221
fprintf(stderr, "Starting Avahi loop search\n");
2732
1222
}
2733
1223
2734
ret = avahi_loop_with_timeout(simple_poll,
2735
(int)(retry_interval * 1000), &mc);
2736
if(debug){
2737
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2738
(ret == 0) ? "successfully" : "with error");
2739
}
1224
avahi_simple_poll_loop(mc.simple_poll);
2740
1225
2741
1226
end:
2742
1227
2743
1228
if(debug){
2744
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1229
fprintf(stderr, "%s exiting\n", argv[0]);
2745
1230
}
2746
1231
2747
1232
/* Cleanup things */
2748
free(mc.interfaces);
2749
2750
1233
if(sb != NULL)
2751
1234
avahi_s_service_browser_free(sb);
2752
1235
2753
1236
if(mc.server != NULL)
2754
1237
avahi_server_free(mc.server);
2755
1238
2756
if(simple_poll != NULL)
2757
avahi_simple_poll_free(simple_poll);
1239
if(mc.simple_poll != NULL)
1240
avahi_simple_poll_free(mc.simple_poll);
2758
1241
2759
1242
if(gnutls_initialized){
2760
1243
gnutls_certificate_free_credentials(mc.cred);
2766
1249
gpgme_release(mc.ctx);
2767
1250
}
2768
1251
2769
/* Cleans up the circular linked list of Mandos servers the client
2770
has seen */
2771
if(mc.current_server != NULL){
2772
mc.current_server->prev->next = NULL;
2773
while(mc.current_server != NULL){
2774
server *next = mc.current_server->next;
2775
#ifdef __GNUC__
2776
#pragma GCC diagnostic push
2777
#pragma GCC diagnostic ignored "-Wcast-qual"
2778
#endif
2779
free((char *)(mc.current_server->ip));
2780
#ifdef __GNUC__
2781
#pragma GCC diagnostic pop
2782
#endif
2783
free(mc.current_server);
2784
mc.current_server = next;
2785
}
2786
}
2787
2788
/* Re-raise privileges */
2789
{
2790
ret_errno = raise_privileges();
2791
if(ret_errno != 0){
2792
errno = ret_errno;
2793
perror_plus("Failed to raise privileges");
2794
} else {
2795
2796
/* Run network hooks */
2797
run_network_hooks("stop", interfaces_hooks != NULL ?
2798
interfaces_hooks : "", delay);
2799
2800
/* Take down the network interfaces which were brought up */
2801
{
2802
char *interface = NULL;
2803
while((interface=argz_next(interfaces_to_take_down,
2804
interfaces_to_take_down_size,
2805
interface))){
2806
ret_errno = take_down_interface(interface);
2807
if(ret_errno != 0){
2808
errno = ret_errno;
2809
perror_plus("Failed to take down interface");
2810
}
2811
}
2812
if(debug and (interfaces_to_take_down == NULL)){
2813
fprintf_plus(stderr, "No interfaces needed to be taken"
2814
" down\n");
2815
}
2816
}
2817
}
2818
2819
ret_errno = lower_privileges_permanently();
2820
if(ret_errno != 0){
2821
errno = ret_errno;
2822
perror_plus("Failed to lower privileges permanently");
2823
}
2824
}
2825
2826
free(interfaces_to_take_down);
2827
free(interfaces_hooks);
2828
2829
/* Removes the GPGME temp directory and all files inside */
2830
if(tempdir != NULL){
2831
struct dirent **direntries = NULL;
2832
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2833
| O_NOFOLLOW
2834
| O_DIRECTORY
2835
| O_PATH));
2836
if(tempdir_fd == -1){
2837
perror_plus("open");
2838
} else {
2839
#ifdef __GLIBC__
2840
#if __GLIBC_PREREQ(2, 15)
2841
int numentries = scandirat(tempdir_fd, ".", &direntries,
2842
notdotentries, alphasort);
2843
#else /* not __GLIBC_PREREQ(2, 15) */
2844
int numentries = scandir(tempdir, &direntries, notdotentries,
2845
alphasort);
2846
#endif /* not __GLIBC_PREREQ(2, 15) */
2847
#else /* not __GLIBC__ */
2848
int numentries = scandir(tempdir, &direntries, notdotentries,
2849
alphasort);
2850
#endif /* not __GLIBC__ */
2851
if(numentries >= 0){
2852
for(int i = 0; i < numentries; i++){
2853
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2854
if(ret == -1){
2855
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2856
" \"%s\", 0): %s\n", tempdir,
2857
direntries[i]->d_name, strerror(errno));
2858
}
2859
free(direntries[i]);
2860
}
2861
2862
/* need to clean even if 0 because man page doesn't specify */
2863
free(direntries);
2864
if(numentries == -1){
2865
perror_plus("scandir");
2866
}
2867
ret = rmdir(tempdir);
2868
if(ret == -1 and errno != ENOENT){
2869
perror_plus("rmdir");
2870
}
2871
}
2872
TEMP_FAILURE_RETRY(close(tempdir_fd));
2873
}
2874
}
2875
2876
if(quit_now){
2877
sigemptyset(&old_sigterm_action.sa_mask);
2878
old_sigterm_action.sa_handler = SIG_DFL;
2879
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2880
&old_sigterm_action,
2881
NULL));
2882
if(ret == -1){
2883
perror_plus("sigaction");
2884
}
2885
do {
2886
ret = raise(signal_received);
2887
} while(ret != 0 and errno == EINTR);
2888
if(ret != 0){
2889
perror_plus("raise");
2890
abort();
2891
}
2892
TEMP_FAILURE_RETRY(pause());
1252
/* Removes the temp directory used by GPGME */
1253
if(tempdir_created){
1254
DIR *d;
1255
struct dirent *direntry;
1256
d = opendir(tempdir);
1257
if(d == NULL){
1258
if(errno != ENOENT){
1259
perror("opendir");
1260
}
1261
} else {
1262
while(true){
1263
direntry = readdir(d);
1264
if(direntry == NULL){
1265
break;
1266
}
1267
/* Skip "." and ".." */
1268
if(direntry->d_name[0] == '.'
1269
and (direntry->d_name[1] == '\0'
1270
or (direntry->d_name[1] == '.'
1271
and direntry->d_name[2] == '\0'))){
1272
continue;
1273
}
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", tempdir,
1276
direntry->d_name);
1277
if(ret < 0){
1278
perror("asprintf");
1279
continue;
1280
}
1281
ret = remove(fullname);
1282
if(ret == -1){
1283
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1284
strerror(errno));
1285
}
1286
free(fullname);
1287
}
1288
closedir(d);
1289
}
1290
ret = rmdir(tempdir);
1291
if(ret == -1 and errno != ENOENT){
1292
perror("rmdir");
1293
}
2893
1294
}
2894
1295
2895
1296
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0