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- Committer: Teddy Hogeborn
- Date: 2009-10-18 17:29:55 UTC
- Revision ID: teddy@fukt.bsnet.se-20091018172955-qqnsfad2lkpkt35f
* plugins.d/password-prompt.c: Use exit codes from <sysexits.h>. Do
close(STDOUT_FILENO) after writing to
check its return code.
close(STDOUT_FILENO) after writing to
check its return code.
- 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 © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 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
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy(), strsignal()
51
*/
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
52
51
#include <sys/ioctl.h> /* ioctl */
53
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
54
53
sockaddr_in6, PF_INET6,
55
54
SOCK_STREAM, uid_t, gid_t, open(),
56
55
opendir(), DIR */
57
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
58
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
59
inet_pton(), connect(),
60
getnameinfo() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
62
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
63
61
*/
64
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
65
63
strtoimax() */
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
71
program_invocation_short_name */
72
#include <time.h> /* nanosleep(), time(), sleep() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
73
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
74
68
SIOCSIFFLAGS, if_indextoname(),
75
69
if_nametoindex(), IF_NAMESIZE */
78
72
*/
79
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
80
74
getuid(), getgid(), seteuid(),
81
setgid(), pause(), _exit(),
82
unlinkat() */
83
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
84
77
#include <iso646.h> /* not, or, and */
85
78
#include <argp.h> /* struct argp_option, error_t, struct
86
79
argp_state, struct argp,
89
82
#include <signal.h> /* sigemptyset(), sigaddset(),
90
83
sigaction(), SIGTERM, sig_atomic_t,
91
84
raise() */
92
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
93
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
94
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
95
WEXITSTATUS(), WTERMSIG() */
96
#include <grp.h> /* setgroups() */
97
#include <argz.h> /* argz_add_sep(), argz_next(),
98
argz_delete(), argz_append(),
99
argz_stringify(), argz_add(),
100
argz_count() */
101
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
102
EAI_SYSTEM, gai_strerror() */
103
85
104
86
#ifdef __linux__
105
87
#include <sys/klog.h> /* klogctl() */
123
105
init_gnutls_session(),
124
106
GNUTLS_* */
125
107
#include <gnutls/openpgp.h>
126
/* gnutls_certificate_set_openpgp_key_file(),
127
GNUTLS_OPENPGP_FMT_BASE64 */
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
128
110
129
111
/* GPGME */
130
112
#include <gpgme.h> /* All GPGME types, constants and
138
120
#define PATHDIR "/conf/conf.d/mandos"
139
121
#define SECKEY "seckey.txt"
140
122
#define PUBKEY "pubkey.txt"
141
#define HOOKDIR "/lib/mandos/network-hooks.d"
142
123
143
124
bool debug = false;
144
125
static const char mandos_protocol_version[] = "1";
145
126
const char *argp_program_version = "mandos-client " VERSION;
146
const char *argp_program_bug_address = "<mandos@recompile.se>";
147
static const char sys_class_net[] = "/sys/class/net";
148
char *connect_to = NULL;
149
const char *hookdir = HOOKDIR;
150
int hookdir_fd = -1;
151
uid_t uid = 65534;
152
gid_t gid = 65534;
153
154
/* Doubly linked list that need to be circularly linked when used */
155
typedef struct server{
156
const char *ip;
157
in_port_t port;
158
AvahiIfIndex if_index;
159
int af;
160
struct timespec last_seen;
161
struct server *next;
162
struct server *prev;
163
} server;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
164
128
165
129
/* Used for passing in values through the Avahi callback functions */
166
130
typedef struct {
131
AvahiSimplePoll *simple_poll;
167
132
AvahiServer *server;
168
133
gnutls_certificate_credentials_t cred;
169
134
unsigned int dh_bits;
170
135
gnutls_dh_params_t dh_params;
171
136
const char *priority;
172
137
gpgme_ctx_t ctx;
173
server *current_server;
174
char *interfaces;
175
size_t interfaces_size;
176
138
} mandos_context;
177
139
178
/* global so signal handler can reach it*/
179
AvahiSimplePoll *simple_poll;
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
180
144
181
145
sig_atomic_t quit_now = 0;
182
146
int signal_received = 0;
183
147
184
/* Function to use when printing errors */
185
void perror_plus(const char *print_text){
186
int e = errno;
187
fprintf(stderr, "Mandos plugin %s: ",
188
program_invocation_short_name);
189
errno = e;
190
perror(print_text);
191
}
192
193
__attribute__((format (gnu_printf, 2, 3), nonnull))
194
int fprintf_plus(FILE *stream, const char *format, ...){
195
va_list ap;
196
va_start (ap, format);
197
198
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
199
program_invocation_short_name));
200
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
201
}
202
203
148
/*
204
149
* Make additional room in "buffer" for at least BUFFER_SIZE more
205
150
* bytes. "buffer_capacity" is how much is currently allocated,
206
151
* "buffer_length" is how much is already used.
207
152
*/
208
__attribute__((nonnull, warn_unused_result))
209
153
size_t incbuffer(char **buffer, size_t buffer_length,
210
size_t buffer_capacity){
154
size_t buffer_capacity){
211
155
if(buffer_length + BUFFER_SIZE > buffer_capacity){
212
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
if(new_buf == NULL){
214
int old_errno = errno;
215
free(*buffer);
216
errno = old_errno;
217
*buffer = NULL;
156
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
157
if(buffer == NULL){
218
158
return 0;
219
159
}
220
*buffer = new_buf;
221
160
buffer_capacity += BUFFER_SIZE;
222
161
}
223
162
return buffer_capacity;
224
163
}
225
164
226
/* Add server to set of servers to retry periodically */
227
__attribute__((nonnull, warn_unused_result))
228
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
229
int af, server **current_server){
230
int ret;
231
server *new_server = malloc(sizeof(server));
232
if(new_server == NULL){
233
perror_plus("malloc");
234
return false;
235
}
236
*new_server = (server){ .ip = strdup(ip),
237
.port = port,
238
.if_index = if_index,
239
.af = af };
240
if(new_server->ip == NULL){
241
perror_plus("strdup");
242
free(new_server);
243
return false;
244
}
245
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
246
if(ret == -1){
247
perror_plus("clock_gettime");
248
#ifdef __GNUC__
249
#pragma GCC diagnostic push
250
#pragma GCC diagnostic ignored "-Wcast-qual"
251
#endif
252
free((char *)(new_server->ip));
253
#ifdef __GNUC__
254
#pragma GCC diagnostic pop
255
#endif
256
free(new_server);
257
return false;
258
}
259
/* Special case of first server */
260
if(*current_server == NULL){
261
new_server->next = new_server;
262
new_server->prev = new_server;
263
*current_server = new_server;
264
} else {
265
/* Place the new server last in the list */
266
new_server->next = *current_server;
267
new_server->prev = (*current_server)->prev;
268
new_server->prev->next = new_server;
269
(*current_server)->prev = new_server;
270
}
271
return true;
272
}
273
274
165
/*
275
166
* Initialize GPGME.
276
167
*/
277
__attribute__((nonnull, warn_unused_result))
278
static bool init_gpgme(const char * const seckey,
279
const char * const pubkey,
280
const char * const tempdir,
281
mandos_context *mc){
168
static bool init_gpgme(const char *seckey,
169
const char *pubkey, const char *tempdir){
282
170
gpgme_error_t rc;
283
171
gpgme_engine_info_t engine_info;
284
172
173
285
174
/*
286
175
* Helper function to insert pub and seckey to the engine keyring.
287
176
*/
288
bool import_key(const char * const filename){
177
bool import_key(const char *filename){
289
178
int ret;
290
179
int fd;
291
180
gpgme_data_t pgp_data;
292
181
293
182
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
294
183
if(fd == -1){
295
perror_plus("open");
184
perror("open");
296
185
return false;
297
186
}
298
187
299
188
rc = gpgme_data_new_from_fd(&pgp_data, fd);
300
189
if(rc != GPG_ERR_NO_ERROR){
301
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
190
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
303
192
return false;
304
193
}
305
194
306
rc = gpgme_op_import(mc->ctx, pgp_data);
195
rc = gpgme_op_import(mc.ctx, pgp_data);
307
196
if(rc != GPG_ERR_NO_ERROR){
308
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
197
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
198
gpgme_strsource(rc), gpgme_strerror(rc));
310
199
return false;
311
200
}
312
201
313
ret = close(fd);
202
ret = (int)TEMP_FAILURE_RETRY(close(fd));
314
203
if(ret == -1){
315
perror_plus("close");
204
perror("close");
316
205
}
317
206
gpgme_data_release(pgp_data);
318
207
return true;
319
208
}
320
209
321
210
if(debug){
322
fprintf_plus(stderr, "Initializing GPGME\n");
211
fprintf(stderr, "Initializing GPGME\n");
323
212
}
324
213
325
214
/* Init GPGME */
326
215
gpgme_check_version(NULL);
327
216
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
328
217
if(rc != GPG_ERR_NO_ERROR){
329
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
330
gpgme_strsource(rc), gpgme_strerror(rc));
218
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
219
gpgme_strsource(rc), gpgme_strerror(rc));
331
220
return false;
332
221
}
333
222
334
/* Set GPGME home directory for the OpenPGP engine only */
223
/* Set GPGME home directory for the OpenPGP engine only */
335
224
rc = gpgme_get_engine_info(&engine_info);
336
225
if(rc != GPG_ERR_NO_ERROR){
337
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
338
gpgme_strsource(rc), gpgme_strerror(rc));
226
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
339
228
return false;
340
229
}
341
230
while(engine_info != NULL){
347
236
engine_info = engine_info->next;
348
237
}
349
238
if(engine_info == NULL){
350
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
351
tempdir);
239
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
352
240
return false;
353
241
}
354
242
355
243
/* Create new GPGME "context" */
356
rc = gpgme_new(&(mc->ctx));
244
rc = gpgme_new(&(mc.ctx));
357
245
if(rc != GPG_ERR_NO_ERROR){
358
fprintf_plus(stderr, "Mandos plugin mandos-client: "
359
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
360
gpgme_strerror(rc));
246
fprintf(stderr, "bad gpgme_new: %s: %s\n",
247
gpgme_strsource(rc), gpgme_strerror(rc));
361
248
return false;
362
249
}
363
250
372
259
* Decrypt OpenPGP data.
373
260
* Returns -1 on error
374
261
*/
375
__attribute__((nonnull, warn_unused_result))
376
262
static ssize_t pgp_packet_decrypt(const char *cryptotext,
377
263
size_t crypto_size,
378
char **plaintext,
379
mandos_context *mc){
264
char **plaintext){
380
265
gpgme_data_t dh_crypto, dh_plain;
381
266
gpgme_error_t rc;
382
267
ssize_t ret;
384
269
ssize_t plaintext_length = 0;
385
270
386
271
if(debug){
387
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
272
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
388
273
}
389
274
390
275
/* Create new GPGME data buffer from memory cryptotext */
391
276
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
392
277
0);
393
278
if(rc != GPG_ERR_NO_ERROR){
394
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
395
gpgme_strsource(rc), gpgme_strerror(rc));
279
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
396
281
return -1;
397
282
}
398
283
399
284
/* Create new empty GPGME data buffer for the plaintext */
400
285
rc = gpgme_data_new(&dh_plain);
401
286
if(rc != GPG_ERR_NO_ERROR){
402
fprintf_plus(stderr, "Mandos plugin mandos-client: "
403
"bad gpgme_data_new: %s: %s\n",
404
gpgme_strsource(rc), gpgme_strerror(rc));
287
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
288
gpgme_strsource(rc), gpgme_strerror(rc));
405
289
gpgme_data_release(dh_crypto);
406
290
return -1;
407
291
}
408
292
409
293
/* Decrypt data from the cryptotext data buffer to the plaintext
410
294
data buffer */
411
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
295
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
412
296
if(rc != GPG_ERR_NO_ERROR){
413
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
414
gpgme_strsource(rc), gpgme_strerror(rc));
297
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
415
299
plaintext_length = -1;
416
300
if(debug){
417
301
gpgme_decrypt_result_t result;
418
result = gpgme_op_decrypt_result(mc->ctx);
302
result = gpgme_op_decrypt_result(mc.ctx);
419
303
if(result == NULL){
420
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
304
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
421
305
} else {
422
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
423
result->unsupported_algorithm);
424
fprintf_plus(stderr, "Wrong key usage: %u\n",
425
result->wrong_key_usage);
306
fprintf(stderr, "Unsupported algorithm: %s\n",
307
result->unsupported_algorithm);
308
fprintf(stderr, "Wrong key usage: %u\n",
309
result->wrong_key_usage);
426
310
if(result->file_name != NULL){
427
fprintf_plus(stderr, "File name: %s\n", result->file_name);
311
fprintf(stderr, "File name: %s\n", result->file_name);
428
312
}
429
313
gpgme_recipient_t recipient;
430
314
recipient = result->recipients;
431
315
while(recipient != NULL){
432
fprintf_plus(stderr, "Public key algorithm: %s\n",
433
gpgme_pubkey_algo_name
434
(recipient->pubkey_algo));
435
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
436
fprintf_plus(stderr, "Secret key available: %s\n",
437
recipient->status == GPG_ERR_NO_SECKEY
438
? "No" : "Yes");
316
fprintf(stderr, "Public key algorithm: %s\n",
317
gpgme_pubkey_algo_name(recipient->pubkey_algo));
318
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
319
fprintf(stderr, "Secret key available: %s\n",
320
recipient->status == GPG_ERR_NO_SECKEY
321
? "No" : "Yes");
439
322
recipient = recipient->next;
440
323
}
441
324
}
444
327
}
445
328
446
329
if(debug){
447
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
330
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
448
331
}
449
332
450
333
/* Seek back to the beginning of the GPGME plaintext data buffer */
451
334
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
452
perror_plus("gpgme_data_seek");
335
perror("gpgme_data_seek");
453
336
plaintext_length = -1;
454
337
goto decrypt_end;
455
338
}
457
340
*plaintext = NULL;
458
341
while(true){
459
342
plaintext_capacity = incbuffer(plaintext,
460
(size_t)plaintext_length,
461
plaintext_capacity);
343
(size_t)plaintext_length,
344
plaintext_capacity);
462
345
if(plaintext_capacity == 0){
463
perror_plus("incbuffer");
464
plaintext_length = -1;
465
goto decrypt_end;
346
perror("incbuffer");
347
plaintext_length = -1;
348
goto decrypt_end;
466
349
}
467
350
468
351
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
473
356
break;
474
357
}
475
358
if(ret < 0){
476
perror_plus("gpgme_data_read");
359
perror("gpgme_data_read");
477
360
plaintext_length = -1;
478
361
goto decrypt_end;
479
362
}
481
364
}
482
365
483
366
if(debug){
484
fprintf_plus(stderr, "Decrypted password is: ");
367
fprintf(stderr, "Decrypted password is: ");
485
368
for(ssize_t i = 0; i < plaintext_length; i++){
486
369
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
487
370
}
498
381
return plaintext_length;
499
382
}
500
383
501
__attribute__((warn_unused_result, const))
502
static const char *safe_string(const char *str){
503
if(str == NULL)
504
return "(unknown)";
505
return str;
506
}
507
508
__attribute__((warn_unused_result))
509
static const char *safer_gnutls_strerror(int value){
510
const char *ret = gnutls_strerror(value);
511
return safe_string(ret);
384
static const char * safer_gnutls_strerror(int value){
385
const char *ret = gnutls_strerror(value); /* Spurious warning from
386
-Wunreachable-code */
387
if(ret == NULL)
388
ret = "(unknown)";
389
return ret;
512
390
}
513
391
514
392
/* GnuTLS log function callback */
515
__attribute__((nonnull))
516
393
static void debuggnutls(__attribute__((unused)) int level,
517
394
const char* string){
518
fprintf_plus(stderr, "GnuTLS: %s", string);
395
fprintf(stderr, "GnuTLS: %s", string);
519
396
}
520
397
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
522
398
static int init_gnutls_global(const char *pubkeyfilename,
523
const char *seckeyfilename,
524
const char *dhparamsfilename,
525
mandos_context *mc){
399
const char *seckeyfilename){
526
400
int ret;
527
unsigned int uret;
528
401
529
402
if(debug){
530
fprintf_plus(stderr, "Initializing GnuTLS\n");
403
fprintf(stderr, "Initializing GnuTLS\n");
404
}
405
406
ret = gnutls_global_init();
407
if(ret != GNUTLS_E_SUCCESS){
408
fprintf(stderr, "GnuTLS global_init: %s\n",
409
safer_gnutls_strerror(ret));
410
return -1;
531
411
}
532
412
533
413
if(debug){
539
419
}
540
420
541
421
/* OpenPGP credentials */
542
ret = gnutls_certificate_allocate_credentials(&mc->cred);
422
gnutls_certificate_allocate_credentials(&mc.cred);
543
423
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
safer_gnutls_strerror(ret));
424
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
from
426
-Wunreachable-code
427
*/
428
safer_gnutls_strerror(ret));
429
gnutls_global_deinit();
546
430
return -1;
547
431
}
548
432
549
433
if(debug){
550
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
551
" secret key %s as GnuTLS credentials\n",
552
pubkeyfilename,
553
seckeyfilename);
434
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
435
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
436
seckeyfilename);
554
437
}
555
438
556
439
ret = gnutls_certificate_set_openpgp_key_file
557
(mc->cred, pubkeyfilename, seckeyfilename,
440
(mc.cred, pubkeyfilename, seckeyfilename,
558
441
GNUTLS_OPENPGP_FMT_BASE64);
559
442
if(ret != GNUTLS_E_SUCCESS){
560
fprintf_plus(stderr,
561
"Error[%d] while reading the OpenPGP key pair ('%s',"
562
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
563
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
564
safer_gnutls_strerror(ret));
443
fprintf(stderr,
444
"Error[%d] while reading the OpenPGP key pair ('%s',"
445
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
446
fprintf(stderr, "The GnuTLS error is: %s\n",
447
safer_gnutls_strerror(ret));
565
448
goto globalfail;
566
449
}
567
450
568
451
/* GnuTLS server initialization */
569
ret = gnutls_dh_params_init(&mc->dh_params);
570
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
572
" initialization: %s\n",
573
safer_gnutls_strerror(ret));
574
goto globalfail;
575
}
576
/* If a Diffie-Hellman parameters file was given, try to use it */
577
if(dhparamsfilename != NULL){
578
gnutls_datum_t params = { .data = NULL, .size = 0 };
579
do {
580
int dhpfile = open(dhparamsfilename, O_RDONLY);
581
if(dhpfile == -1){
582
perror_plus("open");
583
dhparamsfilename = NULL;
584
break;
585
}
586
size_t params_capacity = 0;
587
while(true){
588
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params.size,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
592
perror_plus("incbuffer");
593
free(params.data);
594
params.data = NULL;
595
dhparamsfilename = NULL;
596
break;
597
}
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
600
BUFFER_SIZE);
601
/* EOF */
602
if(bytes_read == 0){
603
break;
604
}
605
/* check bytes_read for failure */
606
if(bytes_read < 0){
607
perror_plus("read");
608
free(params.data);
609
params.data = NULL;
610
dhparamsfilename = NULL;
611
break;
612
}
613
params.size += (unsigned int)bytes_read;
614
}
615
if(params.data == NULL){
616
dhparamsfilename = NULL;
617
}
618
if(dhparamsfilename == NULL){
619
break;
620
}
621
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
622
GNUTLS_X509_FMT_PEM);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Failed to parse DH parameters in file"
625
" \"%s\": %s\n", dhparamsfilename,
626
safer_gnutls_strerror(ret));
627
dhparamsfilename = NULL;
628
}
629
} while(false);
630
}
631
if(dhparamsfilename == NULL){
632
if(mc->dh_bits == 0){
633
/* Find out the optimal number of DH bits */
634
/* Try to read the private key file */
635
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
636
do {
637
int secfile = open(seckeyfilename, O_RDONLY);
638
if(secfile == -1){
639
perror_plus("open");
640
break;
641
}
642
size_t buffer_capacity = 0;
643
while(true){
644
buffer_capacity = incbuffer((char **)&buffer.data,
645
(size_t)buffer.size,
646
(size_t)buffer_capacity);
647
if(buffer_capacity == 0){
648
perror_plus("incbuffer");
649
free(buffer.data);
650
buffer.data = NULL;
651
break;
652
}
653
ssize_t bytes_read = read(secfile,
654
buffer.data + buffer.size,
655
BUFFER_SIZE);
656
/* EOF */
657
if(bytes_read == 0){
658
break;
659
}
660
/* check bytes_read for failure */
661
if(bytes_read < 0){
662
perror_plus("read");
663
free(buffer.data);
664
buffer.data = NULL;
665
break;
666
}
667
buffer.size += (unsigned int)bytes_read;
668
}
669
close(secfile);
670
} while(false);
671
/* If successful, use buffer to parse private key */
672
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
673
if(buffer.data != NULL){
674
{
675
gnutls_openpgp_privkey_t privkey = NULL;
676
ret = gnutls_openpgp_privkey_init(&privkey);
677
if(ret != GNUTLS_E_SUCCESS){
678
fprintf_plus(stderr, "Error initializing OpenPGP key"
679
" structure: %s",
680
safer_gnutls_strerror(ret));
681
free(buffer.data);
682
buffer.data = NULL;
683
} else {
684
ret = gnutls_openpgp_privkey_import
685
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
686
if(ret != GNUTLS_E_SUCCESS){
687
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
688
safer_gnutls_strerror(ret));
689
privkey = NULL;
690
}
691
free(buffer.data);
692
buffer.data = NULL;
693
if(privkey != NULL){
694
/* Use private key to suggest an appropriate
695
sec_param */
696
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
697
gnutls_openpgp_privkey_deinit(privkey);
698
if(debug){
699
fprintf_plus(stderr, "This OpenPGP key implies using"
700
" a GnuTLS security parameter \"%s\".\n",
701
safe_string(gnutls_sec_param_get_name
702
(sec_param)));
703
}
704
}
705
}
706
}
707
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
708
/* Err on the side of caution */
709
sec_param = GNUTLS_SEC_PARAM_ULTRA;
710
if(debug){
711
fprintf_plus(stderr, "Falling back to security parameter"
712
" \"%s\"\n",
713
safe_string(gnutls_sec_param_get_name
714
(sec_param)));
715
}
716
}
717
}
718
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
719
if(uret != 0){
720
mc->dh_bits = uret;
721
if(debug){
722
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
723
" implies %u DH bits; using that.\n",
724
safe_string(gnutls_sec_param_get_name
725
(sec_param)),
726
mc->dh_bits);
727
}
728
} else {
729
fprintf_plus(stderr, "Failed to get implied number of DH"
730
" bits for security parameter \"%s\"): %s\n",
731
safe_string(gnutls_sec_param_get_name
732
(sec_param)),
733
safer_gnutls_strerror(ret));
734
goto globalfail;
735
}
736
} else if(debug){
737
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
738
mc->dh_bits);
739
}
740
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
741
if(ret != GNUTLS_E_SUCCESS){
742
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
743
" bits): %s\n", mc->dh_bits,
744
safer_gnutls_strerror(ret));
745
goto globalfail;
746
}
747
}
748
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
452
ret = gnutls_dh_params_init(&mc.dh_params);
453
if(ret != GNUTLS_E_SUCCESS){
454
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
455
" %s\n", safer_gnutls_strerror(ret));
456
goto globalfail;
457
}
458
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
459
if(ret != GNUTLS_E_SUCCESS){
460
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
461
safer_gnutls_strerror(ret));
462
goto globalfail;
463
}
464
465
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
749
466
750
467
return 0;
751
468
752
469
globalfail:
753
470
754
gnutls_certificate_free_credentials(mc->cred);
755
gnutls_dh_params_deinit(mc->dh_params);
471
gnutls_certificate_free_credentials(mc.cred);
472
gnutls_global_deinit();
473
gnutls_dh_params_deinit(mc.dh_params);
756
474
return -1;
757
475
}
758
476
759
__attribute__((nonnull, warn_unused_result))
760
static int init_gnutls_session(gnutls_session_t *session,
761
mandos_context *mc){
477
static int init_gnutls_session(gnutls_session_t *session){
762
478
int ret;
763
479
/* GnuTLS session creation */
764
480
do {
768
484
}
769
485
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
770
486
if(ret != GNUTLS_E_SUCCESS){
771
fprintf_plus(stderr,
772
"Error in GnuTLS session initialization: %s\n",
773
safer_gnutls_strerror(ret));
487
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
488
safer_gnutls_strerror(ret));
774
489
}
775
490
776
491
{
777
492
const char *err;
778
493
do {
779
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
494
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
780
495
if(quit_now){
781
496
gnutls_deinit(*session);
782
497
return -1;
783
498
}
784
499
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
785
500
if(ret != GNUTLS_E_SUCCESS){
786
fprintf_plus(stderr, "Syntax error at: %s\n", err);
787
fprintf_plus(stderr, "GnuTLS error: %s\n",
788
safer_gnutls_strerror(ret));
501
fprintf(stderr, "Syntax error at: %s\n", err);
502
fprintf(stderr, "GnuTLS error: %s\n",
503
safer_gnutls_strerror(ret));
789
504
gnutls_deinit(*session);
790
505
return -1;
791
506
}
793
508
794
509
do {
795
510
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
796
mc->cred);
511
mc.cred);
797
512
if(quit_now){
798
513
gnutls_deinit(*session);
799
514
return -1;
800
515
}
801
516
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
802
517
if(ret != GNUTLS_E_SUCCESS){
803
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
804
safer_gnutls_strerror(ret));
518
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
519
safer_gnutls_strerror(ret));
805
520
gnutls_deinit(*session);
806
521
return -1;
807
522
}
809
524
/* ignore client certificate if any. */
810
525
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
811
526
527
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
528
812
529
return 0;
813
530
}
814
531
816
533
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
817
534
__attribute__((unused)) const char *txt){}
818
535
819
/* Set effective uid to 0, return errno */
820
__attribute__((warn_unused_result))
821
int raise_privileges(void){
822
int old_errno = errno;
823
int ret = 0;
824
if(seteuid(0) == -1){
825
ret = errno;
826
}
827
errno = old_errno;
828
return ret;
829
}
830
831
/* Set effective and real user ID to 0. Return errno. */
832
__attribute__((warn_unused_result))
833
int raise_privileges_permanently(void){
834
int old_errno = errno;
835
int ret = raise_privileges();
836
if(ret != 0){
837
errno = old_errno;
838
return ret;
839
}
840
if(setuid(0) == -1){
841
ret = errno;
842
}
843
errno = old_errno;
844
return ret;
845
}
846
847
/* Set effective user ID to unprivileged saved user ID */
848
__attribute__((warn_unused_result))
849
int lower_privileges(void){
850
int old_errno = errno;
851
int ret = 0;
852
if(seteuid(uid) == -1){
853
ret = errno;
854
}
855
errno = old_errno;
856
return ret;
857
}
858
859
/* Lower privileges permanently */
860
__attribute__((warn_unused_result))
861
int lower_privileges_permanently(void){
862
int old_errno = errno;
863
int ret = 0;
864
if(setuid(uid) == -1){
865
ret = errno;
866
}
867
errno = old_errno;
868
return ret;
869
}
870
871
/* Helper function to add_local_route() and delete_local_route() */
872
__attribute__((nonnull, warn_unused_result))
873
static bool add_delete_local_route(const bool add,
874
const char *address,
875
AvahiIfIndex if_index){
876
int ret;
877
char helper[] = "mandos-client-iprouteadddel";
878
char add_arg[] = "add";
879
char delete_arg[] = "delete";
880
char debug_flag[] = "--debug";
881
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
882
if(pluginhelperdir == NULL){
883
if(debug){
884
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
885
" variable not set; cannot run helper\n");
886
}
887
return false;
888
}
889
890
char interface[IF_NAMESIZE];
891
if(if_indextoname((unsigned int)if_index, interface) == NULL){
892
perror_plus("if_indextoname");
893
return false;
894
}
895
896
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
897
if(devnull == -1){
898
perror_plus("open(\"/dev/null\", O_RDONLY)");
899
return false;
900
}
901
pid_t pid = fork();
902
if(pid == 0){
903
/* Child */
904
/* Raise privileges */
905
errno = raise_privileges_permanently();
906
if(errno != 0){
907
perror_plus("Failed to raise privileges");
908
/* _exit(EX_NOPERM); */
909
} else {
910
/* Set group */
911
errno = 0;
912
ret = setgid(0);
913
if(ret == -1){
914
perror_plus("setgid");
915
_exit(EX_NOPERM);
916
}
917
/* Reset supplementary groups */
918
errno = 0;
919
ret = setgroups(0, NULL);
920
if(ret == -1){
921
perror_plus("setgroups");
922
_exit(EX_NOPERM);
923
}
924
}
925
ret = dup2(devnull, STDIN_FILENO);
926
if(ret == -1){
927
perror_plus("dup2(devnull, STDIN_FILENO)");
928
_exit(EX_OSERR);
929
}
930
ret = close(devnull);
931
if(ret == -1){
932
perror_plus("close");
933
_exit(EX_OSERR);
934
}
935
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
936
if(ret == -1){
937
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
938
_exit(EX_OSERR);
939
}
940
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
941
O_RDONLY
942
| O_DIRECTORY
943
| O_PATH
944
| O_CLOEXEC));
945
if(helperdir_fd == -1){
946
perror_plus("open");
947
_exit(EX_UNAVAILABLE);
948
}
949
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
950
helper, O_RDONLY));
951
if(helper_fd == -1){
952
perror_plus("openat");
953
close(helperdir_fd);
954
_exit(EX_UNAVAILABLE);
955
}
956
close(helperdir_fd);
957
#ifdef __GNUC__
958
#pragma GCC diagnostic push
959
#pragma GCC diagnostic ignored "-Wcast-qual"
960
#endif
961
if(fexecve(helper_fd, (char *const [])
962
{ helper, add ? add_arg : delete_arg, (char *)address,
963
interface, debug ? debug_flag : NULL, NULL },
964
environ) == -1){
965
#ifdef __GNUC__
966
#pragma GCC diagnostic pop
967
#endif
968
perror_plus("fexecve");
969
_exit(EXIT_FAILURE);
970
}
971
}
972
if(pid == -1){
973
perror_plus("fork");
974
return false;
975
}
976
int status;
977
pid_t pret = -1;
978
errno = 0;
979
do {
980
pret = waitpid(pid, &status, 0);
981
if(pret == -1 and errno == EINTR and quit_now){
982
int errno_raising = 0;
983
if((errno = raise_privileges()) != 0){
984
errno_raising = errno;
985
perror_plus("Failed to raise privileges in order to"
986
" kill helper program");
987
}
988
if(kill(pid, SIGTERM) == -1){
989
perror_plus("kill");
990
}
991
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
992
perror_plus("Failed to lower privileges after killing"
993
" helper program");
994
}
995
return false;
996
}
997
} while(pret == -1 and errno == EINTR);
998
if(pret == -1){
999
perror_plus("waitpid");
1000
return false;
1001
}
1002
if(WIFEXITED(status)){
1003
if(WEXITSTATUS(status) != 0){
1004
fprintf_plus(stderr, "Error: iprouteadddel exited"
1005
" with status %d\n", WEXITSTATUS(status));
1006
return false;
1007
}
1008
return true;
1009
}
1010
if(WIFSIGNALED(status)){
1011
fprintf_plus(stderr, "Error: iprouteadddel died by"
1012
" signal %d\n", WTERMSIG(status));
1013
return false;
1014
}
1015
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1016
return false;
1017
}
1018
1019
__attribute__((nonnull, warn_unused_result))
1020
static bool add_local_route(const char *address,
1021
AvahiIfIndex if_index){
1022
if(debug){
1023
fprintf_plus(stderr, "Adding route to %s\n", address);
1024
}
1025
return add_delete_local_route(true, address, if_index);
1026
}
1027
1028
__attribute__((nonnull, warn_unused_result))
1029
static bool delete_local_route(const char *address,
1030
AvahiIfIndex if_index){
1031
if(debug){
1032
fprintf_plus(stderr, "Removing route to %s\n", address);
1033
}
1034
return add_delete_local_route(false, address, if_index);
1035
}
1036
1037
536
/* Called when a Mandos server is found */
1038
__attribute__((nonnull, warn_unused_result))
1039
static int start_mandos_communication(const char *ip, in_port_t port,
537
static int start_mandos_communication(const char *ip, uint16_t port,
1040
538
AvahiIfIndex if_index,
1041
int af, mandos_context *mc){
539
int af){
1042
540
int ret, tcp_sd = -1;
1043
541
ssize_t sret;
1044
struct sockaddr_storage to;
542
union {
543
struct sockaddr_in in;
544
struct sockaddr_in6 in6;
545
} to;
1045
546
char *buffer = NULL;
1046
547
char *decrypted_buffer = NULL;
1047
548
size_t buffer_length = 0;
1050
551
int retval = -1;
1051
552
gnutls_session_t session;
1052
553
int pf; /* Protocol family */
1053
bool route_added = false;
1054
1055
errno = 0;
1056
554
1057
555
if(quit_now){
1058
errno = EINTR;
1059
556
return -1;
1060
557
}
1061
558
1067
564
pf = PF_INET;
1068
565
break;
1069
566
default:
1070
fprintf_plus(stderr, "Bad address family: %d\n", af);
1071
errno = EINVAL;
567
fprintf(stderr, "Bad address family: %d\n", af);
1072
568
return -1;
1073
569
}
1074
570
1075
/* If the interface is specified and we have a list of interfaces */
1076
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1077
/* Check if the interface is one of the interfaces we are using */
1078
bool match = false;
1079
{
1080
char *interface = NULL;
1081
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1082
interface))){
1083
if(if_nametoindex(interface) == (unsigned int)if_index){
1084
match = true;
1085
break;
1086
}
1087
}
1088
}
1089
if(not match){
1090
/* This interface does not match any in the list, so we don't
1091
connect to the server */
1092
if(debug){
1093
char interface[IF_NAMESIZE];
1094
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1095
perror_plus("if_indextoname");
1096
} else {
1097
fprintf_plus(stderr, "Skipping server on non-used interface"
1098
" \"%s\"\n",
1099
if_indextoname((unsigned int)if_index,
1100
interface));
1101
}
1102
}
1103
return -1;
1104
}
1105
}
1106
1107
ret = init_gnutls_session(&session, mc);
571
ret = init_gnutls_session(&session);
1108
572
if(ret != 0){
1109
573
return -1;
1110
574
}
1111
575
1112
576
if(debug){
1113
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1114
PRIuMAX "\n", ip, (uintmax_t)port);
577
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
578
"\n", ip, port);
1115
579
}
1116
580
1117
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
581
tcp_sd = socket(pf, SOCK_STREAM, 0);
1118
582
if(tcp_sd < 0){
1119
int e = errno;
1120
perror_plus("socket");
1121
errno = e;
583
perror("socket");
1122
584
goto mandos_end;
1123
585
}
1124
586
1125
587
if(quit_now){
1126
errno = EINTR;
1127
588
goto mandos_end;
1128
589
}
1129
590
591
memset(&to, 0, sizeof(to));
1130
592
if(af == AF_INET6){
1131
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1132
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1133
ret = inet_pton(af, ip, &to6->sin6_addr);
593
to.in6.sin6_family = (sa_family_t)af;
594
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1134
595
} else { /* IPv4 */
1135
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1136
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to4->sin_addr);
596
to.in.sin_family = (sa_family_t)af;
597
ret = inet_pton(af, ip, &to.in.sin_addr);
1138
598
}
1139
599
if(ret < 0 ){
1140
int e = errno;
1141
perror_plus("inet_pton");
1142
errno = e;
600
perror("inet_pton");
1143
601
goto mandos_end;
1144
602
}
1145
603
if(ret == 0){
1146
int e = errno;
1147
fprintf_plus(stderr, "Bad address: %s\n", ip);
1148
errno = e;
604
fprintf(stderr, "Bad address: %s\n", ip);
1149
605
goto mandos_end;
1150
606
}
1151
607
if(af == AF_INET6){
1152
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1153
if(IN6_IS_ADDR_LINKLOCAL
1154
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
608
to.in6.sin6_port = htons(port); /* Spurious warnings from
609
-Wconversion and
610
-Wunreachable-code */
611
612
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
613
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
614
-Wunreachable-code*/
1155
615
if(if_index == AVAHI_IF_UNSPEC){
1156
fprintf_plus(stderr, "An IPv6 link-local address is"
1157
" incomplete without a network interface\n");
1158
errno = EINVAL;
616
fprintf(stderr, "An IPv6 link-local address is incomplete"
617
" without a network interface\n");
1159
618
goto mandos_end;
1160
619
}
1161
620
/* Set the network interface number as scope */
1162
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
621
to.in6.sin6_scope_id = (uint32_t)if_index;
1163
622
}
1164
623
} else {
1165
((struct sockaddr_in *)&to)->sin_port = htons(port);
624
to.in.sin_port = htons(port); /* Spurious warnings from
625
-Wconversion and
626
-Wunreachable-code */
1166
627
}
1167
628
1168
629
if(quit_now){
1169
errno = EINTR;
1170
630
goto mandos_end;
1171
631
}
1172
632
1174
634
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1175
635
char interface[IF_NAMESIZE];
1176
636
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1177
perror_plus("if_indextoname");
637
perror("if_indextoname");
1178
638
} else {
1179
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1180
"\n", ip, interface, (uintmax_t)port);
639
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
640
ip, interface, port);
1181
641
}
1182
642
} else {
1183
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1184
ip, (uintmax_t)port);
643
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
644
port);
1185
645
}
1186
646
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1187
647
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1188
if(af == AF_INET6){
1189
ret = getnameinfo((struct sockaddr *)&to,
1190
sizeof(struct sockaddr_in6),
1191
addrstr, sizeof(addrstr), NULL, 0,
1192
NI_NUMERICHOST);
1193
} else {
1194
ret = getnameinfo((struct sockaddr *)&to,
1195
sizeof(struct sockaddr_in),
1196
addrstr, sizeof(addrstr), NULL, 0,
1197
NI_NUMERICHOST);
1198
}
1199
if(ret == EAI_SYSTEM){
1200
perror_plus("getnameinfo");
1201
} else if(ret != 0) {
1202
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1203
} else if(strcmp(addrstr, ip) != 0){
1204
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1205
}
1206
}
1207
1208
if(quit_now){
1209
errno = EINTR;
1210
goto mandos_end;
1211
}
1212
1213
while(true){
1214
if(af == AF_INET6){
1215
ret = connect(tcp_sd, (struct sockaddr *)&to,
1216
sizeof(struct sockaddr_in6));
1217
} else {
1218
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1219
sizeof(struct sockaddr_in));
1220
}
1221
if(ret < 0){
1222
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1223
and if_index != AVAHI_IF_UNSPEC
1224
and connect_to == NULL
1225
and not route_added and
1226
((af == AF_INET6 and not
1227
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1228
&to)->sin6_addr)))
1229
or (af == AF_INET and
1230
/* Not a a IPv4LL address */
1231
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1232
& 0xFFFF0000L) != 0xA9FE0000L))){
1233
/* Work around Avahi bug - Avahi does not announce link-local
1234
addresses if it has a global address, so local hosts with
1235
*only* a link-local address (e.g. Mandos clients) cannot
1236
connect to a Mandos server announced by Avahi on a server
1237
host with a global address. Work around this by retrying
1238
with an explicit route added with the server's address.
1239
1240
Avahi bug reference:
1241
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1242
https://bugs.debian.org/587961
1243
*/
1244
if(debug){
1245
fprintf_plus(stderr, "Mandos server unreachable, trying"
1246
" direct route\n");
1247
}
1248
int e = errno;
1249
route_added = add_local_route(ip, if_index);
1250
if(route_added){
1251
continue;
1252
}
1253
errno = e;
1254
}
1255
if(errno != ECONNREFUSED or debug){
1256
int e = errno;
1257
perror_plus("connect");
1258
errno = e;
1259
}
1260
goto mandos_end;
1261
}
1262
1263
if(quit_now){
1264
errno = EINTR;
1265
goto mandos_end;
1266
}
1267
break;
648
const char *pcret;
649
if(af == AF_INET6){
650
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
651
sizeof(addrstr));
652
} else {
653
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
654
sizeof(addrstr));
655
}
656
if(pcret == NULL){
657
perror("inet_ntop");
658
} else {
659
if(strcmp(addrstr, ip) != 0){
660
fprintf(stderr, "Canonical address form: %s\n", addrstr);
661
}
662
}
663
}
664
665
if(quit_now){
666
goto mandos_end;
667
}
668
669
if(af == AF_INET6){
670
ret = connect(tcp_sd, &to.in6, sizeof(to));
671
} else {
672
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
673
}
674
if(ret < 0){
675
perror("connect");
676
goto mandos_end;
677
}
678
679
if(quit_now){
680
goto mandos_end;
1268
681
}
1269
682
1270
683
const char *out = mandos_protocol_version;
1272
685
while(true){
1273
686
size_t out_size = strlen(out);
1274
687
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1275
out_size - written));
688
out_size - written));
1276
689
if(ret == -1){
1277
int e = errno;
1278
perror_plus("write");
1279
errno = e;
690
perror("write");
1280
691
goto mandos_end;
1281
692
}
1282
693
written += (size_t)ret;
1292
703
}
1293
704
1294
705
if(quit_now){
1295
errno = EINTR;
1296
706
goto mandos_end;
1297
707
}
1298
708
}
1299
709
1300
710
if(debug){
1301
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
711
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1302
712
}
1303
713
1304
714
if(quit_now){
1305
errno = EINTR;
1306
715
goto mandos_end;
1307
716
}
1308
717
1309
/* This casting via intptr_t is to eliminate warning about casting
1310
an int to a pointer type. This is exactly how the GnuTLS Guile
1311
function "set-session-transport-fd!" does it. */
1312
gnutls_transport_set_ptr(session,
1313
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
718
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1314
719
1315
720
if(quit_now){
1316
errno = EINTR;
1317
721
goto mandos_end;
1318
722
}
1319
723
1320
724
do {
1321
725
ret = gnutls_handshake(session);
1322
726
if(quit_now){
1323
errno = EINTR;
1324
727
goto mandos_end;
1325
728
}
1326
729
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1327
730
1328
731
if(ret != GNUTLS_E_SUCCESS){
1329
732
if(debug){
1330
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
733
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1331
734
gnutls_perror(ret);
1332
735
}
1333
errno = EPROTO;
1334
736
goto mandos_end;
1335
737
}
1336
738
1337
739
/* Read OpenPGP packet that contains the wanted password */
1338
740
1339
741
if(debug){
1340
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1341
" %s\n", ip);
742
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
743
ip);
1342
744
}
1343
745
1344
746
while(true){
1345
747
1346
748
if(quit_now){
1347
errno = EINTR;
1348
749
goto mandos_end;
1349
750
}
1350
751
1351
752
buffer_capacity = incbuffer(&buffer, buffer_length,
1352
buffer_capacity);
753
buffer_capacity);
1353
754
if(buffer_capacity == 0){
1354
int e = errno;
1355
perror_plus("incbuffer");
1356
errno = e;
755
perror("incbuffer");
1357
756
goto mandos_end;
1358
757
}
1359
758
1360
759
if(quit_now){
1361
errno = EINTR;
1362
760
goto mandos_end;
1363
761
}
1364
762
1377
775
ret = gnutls_handshake(session);
1378
776
1379
777
if(quit_now){
1380
errno = EINTR;
1381
778
goto mandos_end;
1382
779
}
1383
780
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1384
781
if(ret < 0){
1385
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1386
"***\n");
782
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1387
783
gnutls_perror(ret);
1388
errno = EPROTO;
1389
784
goto mandos_end;
1390
785
}
1391
786
break;
1392
787
default:
1393
fprintf_plus(stderr, "Unknown error while reading data from"
1394
" encrypted session with Mandos server\n");
788
fprintf(stderr, "Unknown error while reading data from"
789
" encrypted session with Mandos server\n");
1395
790
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1396
errno = EIO;
1397
791
goto mandos_end;
1398
792
}
1399
793
} else {
1402
796
}
1403
797
1404
798
if(debug){
1405
fprintf_plus(stderr, "Closing TLS session\n");
799
fprintf(stderr, "Closing TLS session\n");
1406
800
}
1407
801
1408
802
if(quit_now){
1409
errno = EINTR;
1410
803
goto mandos_end;
1411
804
}
1412
805
1413
806
do {
1414
807
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1415
808
if(quit_now){
1416
errno = EINTR;
1417
809
goto mandos_end;
1418
810
}
1419
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1420
812
1421
813
if(buffer_length > 0){
1422
814
ssize_t decrypted_buffer_size;
1423
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1424
&decrypted_buffer, mc);
815
decrypted_buffer_size = pgp_packet_decrypt(buffer,
816
buffer_length,
817
&decrypted_buffer);
1425
818
if(decrypted_buffer_size >= 0){
1426
819
1427
clearerr(stdout);
1428
820
written = 0;
1429
821
while(written < (size_t) decrypted_buffer_size){
1430
822
if(quit_now){
1431
errno = EINTR;
1432
823
goto mandos_end;
1433
824
}
1434
825
1436
827
(size_t)decrypted_buffer_size - written,
1437
828
stdout);
1438
829
if(ret == 0 and ferror(stdout)){
1439
int e = errno;
1440
830
if(debug){
1441
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1442
strerror(errno));
831
fprintf(stderr, "Error writing encrypted data: %s\n",
832
strerror(errno));
1443
833
}
1444
errno = e;
1445
834
goto mandos_end;
1446
835
}
1447
836
written += (size_t)ret;
1448
837
}
1449
ret = fflush(stdout);
1450
if(ret != 0){
1451
int e = errno;
1452
if(debug){
1453
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1454
strerror(errno));
1455
}
1456
errno = e;
1457
goto mandos_end;
1458
}
1459
838
retval = 0;
1460
839
}
1461
840
}
1463
842
/* Shutdown procedure */
1464
843
1465
844
mandos_end:
1466
{
1467
if(route_added){
1468
if(not delete_local_route(ip, if_index)){
1469
fprintf_plus(stderr, "Failed to delete local route to %s on"
1470
" interface %d", ip, if_index);
1471
}
1472
}
1473
int e = errno;
1474
free(decrypted_buffer);
1475
free(buffer);
1476
if(tcp_sd >= 0){
1477
ret = close(tcp_sd);
1478
}
1479
if(ret == -1){
1480
if(e == 0){
1481
e = errno;
1482
}
1483
perror_plus("close");
1484
}
1485
gnutls_deinit(session);
1486
errno = e;
1487
if(quit_now){
1488
errno = EINTR;
1489
retval = -1;
1490
}
845
free(decrypted_buffer);
846
free(buffer);
847
if(tcp_sd >= 0){
848
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
849
}
850
if(ret == -1){
851
perror("close");
852
}
853
gnutls_deinit(session);
854
if(quit_now){
855
retval = -1;
1491
856
}
1492
857
return retval;
1493
858
}
1494
859
1495
__attribute__((nonnull))
1496
860
static void resolve_callback(AvahiSServiceResolver *r,
1497
861
AvahiIfIndex interface,
1498
862
AvahiProtocol proto,
1506
870
AVAHI_GCC_UNUSED AvahiStringList *txt,
1507
871
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1508
872
flags,
1509
void *mc){
1510
if(r == NULL){
1511
return;
1512
}
873
AVAHI_GCC_UNUSED void* userdata){
874
assert(r);
1513
875
1514
876
/* Called whenever a service has been resolved successfully or
1515
877
timed out */
1516
878
1517
879
if(quit_now){
1518
avahi_s_service_resolver_free(r);
1519
880
return;
1520
881
}
1521
882
1522
883
switch(event){
1523
884
default:
1524
885
case AVAHI_RESOLVER_FAILURE:
1525
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1526
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1527
domain,
1528
avahi_strerror(avahi_server_errno
1529
(((mandos_context*)mc)->server)));
886
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
887
" of type '%s' in domain '%s': %s\n", name, type, domain,
888
avahi_strerror(avahi_server_errno(mc.server)));
1530
889
break;
1531
890
1532
891
case AVAHI_RESOLVER_FOUND:
1534
893
char ip[AVAHI_ADDRESS_STR_MAX];
1535
894
avahi_address_snprint(ip, sizeof(ip), address);
1536
895
if(debug){
1537
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1538
PRIdMAX ") on port %" PRIu16 "\n", name,
1539
host_name, ip, (intmax_t)interface, port);
896
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
897
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
898
ip, (intmax_t)interface, port);
1540
899
}
1541
int ret = start_mandos_communication(ip, (in_port_t)port,
1542
interface,
1543
avahi_proto_to_af(proto),
1544
mc);
900
int ret = start_mandos_communication(ip, port, interface,
901
avahi_proto_to_af(proto));
1545
902
if(ret == 0){
1546
avahi_simple_poll_quit(simple_poll);
1547
} else {
1548
if(not add_server(ip, (in_port_t)port, interface,
1549
avahi_proto_to_af(proto),
1550
&((mandos_context*)mc)->current_server)){
1551
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1552
" list\n", name);
1553
}
903
avahi_simple_poll_quit(mc.simple_poll);
1554
904
}
1555
905
}
1556
906
}
1566
916
const char *domain,
1567
917
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1568
918
flags,
1569
void *mc){
1570
if(b == NULL){
1571
return;
1572
}
919
AVAHI_GCC_UNUSED void* userdata){
920
assert(b);
1573
921
1574
922
/* Called whenever a new services becomes available on the LAN or
1575
923
is removed from the LAN */
1582
930
default:
1583
931
case AVAHI_BROWSER_FAILURE:
1584
932
1585
fprintf_plus(stderr, "(Avahi browser) %s\n",
1586
avahi_strerror(avahi_server_errno
1587
(((mandos_context*)mc)->server)));
1588
avahi_simple_poll_quit(simple_poll);
933
fprintf(stderr, "(Avahi browser) %s\n",
934
avahi_strerror(avahi_server_errno(mc.server)));
935
avahi_simple_poll_quit(mc.simple_poll);
1589
936
return;
1590
937
1591
938
case AVAHI_BROWSER_NEW:
1594
941
the callback function is called the Avahi server will free the
1595
942
resolver for us. */
1596
943
1597
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1598
interface, protocol, name, type,
1599
domain, protocol, 0,
1600
resolve_callback, mc) == NULL)
1601
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1602
" %s\n", name,
1603
avahi_strerror(avahi_server_errno
1604
(((mandos_context*)mc)->server)));
944
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
945
name, type, domain, protocol, 0,
946
resolve_callback, NULL) == NULL)
947
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
948
name, avahi_strerror(avahi_server_errno(mc.server)));
1605
949
break;
1606
950
1607
951
case AVAHI_BROWSER_REMOVE:
1610
954
case AVAHI_BROWSER_ALL_FOR_NOW:
1611
955
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1612
956
if(debug){
1613
fprintf_plus(stderr, "No Mandos server found, still"
1614
" searching...\n");
957
fprintf(stderr, "No Mandos server found, still searching...\n");
1615
958
}
1616
959
break;
1617
960
}
1618
961
}
1619
962
1620
/* Signal handler that stops main loop after SIGTERM */
963
/* stop main loop after sigterm has been called */
1621
964
static void handle_sigterm(int sig){
1622
965
if(quit_now){
1623
966
return;
1625
968
quit_now = 1;
1626
969
signal_received = sig;
1627
970
int old_errno = errno;
1628
/* set main loop to exit */
1629
if(simple_poll != NULL){
1630
avahi_simple_poll_quit(simple_poll);
1631
}
1632
errno = old_errno;
1633
}
1634
1635
__attribute__((nonnull, warn_unused_result))
1636
bool get_flags(const char *ifname, struct ifreq *ifr){
1637
int ret;
1638
int old_errno;
1639
1640
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1641
if(s < 0){
1642
old_errno = errno;
1643
perror_plus("socket");
1644
errno = old_errno;
1645
return false;
1646
}
1647
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1648
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1649
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1650
if(ret == -1){
1651
if(debug){
1652
old_errno = errno;
1653
perror_plus("ioctl SIOCGIFFLAGS");
1654
errno = old_errno;
1655
}
1656
return false;
1657
}
1658
return true;
1659
}
1660
1661
__attribute__((nonnull, warn_unused_result))
1662
bool good_flags(const char *ifname, const struct ifreq *ifr){
1663
1664
/* Reject the loopback device */
1665
if(ifr->ifr_flags & IFF_LOOPBACK){
1666
if(debug){
1667
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1668
ifname);
1669
}
1670
return false;
1671
}
1672
/* Accept point-to-point devices only if connect_to is specified */
1673
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1674
if(debug){
1675
fprintf_plus(stderr, "Accepting point-to-point interface"
1676
" \"%s\"\n", ifname);
1677
}
1678
return true;
1679
}
1680
/* Otherwise, reject non-broadcast-capable devices */
1681
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1682
if(debug){
1683
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1684
" \"%s\"\n", ifname);
1685
}
1686
return false;
1687
}
1688
/* Reject non-ARP interfaces (including dummy interfaces) */
1689
if(ifr->ifr_flags & IFF_NOARP){
1690
if(debug){
1691
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1692
ifname);
1693
}
1694
return false;
1695
}
1696
1697
/* Accept this device */
1698
if(debug){
1699
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1700
}
1701
return true;
1702
}
1703
1704
/*
1705
* This function determines if a directory entry in /sys/class/net
1706
* corresponds to an acceptable network device.
1707
* (This function is passed to scandir(3) as a filter function.)
1708
*/
1709
__attribute__((nonnull, warn_unused_result))
1710
int good_interface(const struct dirent *if_entry){
1711
if(if_entry->d_name[0] == '.'){
1712
return 0;
1713
}
1714
1715
struct ifreq ifr;
1716
if(not get_flags(if_entry->d_name, &ifr)){
1717
if(debug){
1718
fprintf_plus(stderr, "Failed to get flags for interface "
1719
"\"%s\"\n", if_entry->d_name);
1720
}
1721
return 0;
1722
}
1723
1724
if(not good_flags(if_entry->d_name, &ifr)){
1725
return 0;
1726
}
1727
return 1;
1728
}
1729
1730
/*
1731
* This function determines if a network interface is up.
1732
*/
1733
__attribute__((nonnull, warn_unused_result))
1734
bool interface_is_up(const char *interface){
1735
struct ifreq ifr;
1736
if(not get_flags(interface, &ifr)){
1737
if(debug){
1738
fprintf_plus(stderr, "Failed to get flags for interface "
1739
"\"%s\"\n", interface);
1740
}
1741
return false;
1742
}
1743
1744
return (bool)(ifr.ifr_flags & IFF_UP);
1745
}
1746
1747
/*
1748
* This function determines if a network interface is running
1749
*/
1750
__attribute__((nonnull, warn_unused_result))
1751
bool interface_is_running(const char *interface){
1752
struct ifreq ifr;
1753
if(not get_flags(interface, &ifr)){
1754
if(debug){
1755
fprintf_plus(stderr, "Failed to get flags for interface "
1756
"\"%s\"\n", interface);
1757
}
1758
return false;
1759
}
1760
1761
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1762
}
1763
1764
__attribute__((nonnull, pure, warn_unused_result))
1765
int notdotentries(const struct dirent *direntry){
1766
/* Skip "." and ".." */
1767
if(direntry->d_name[0] == '.'
1768
and (direntry->d_name[1] == '\0'
1769
or (direntry->d_name[1] == '.'
1770
and direntry->d_name[2] == '\0'))){
1771
return 0;
1772
}
1773
return 1;
1774
}
1775
1776
/* Is this directory entry a runnable program? */
1777
__attribute__((nonnull, warn_unused_result))
1778
int runnable_hook(const struct dirent *direntry){
1779
int ret;
1780
size_t sret;
1781
struct stat st;
1782
1783
if((direntry->d_name)[0] == '\0'){
1784
/* Empty name? */
1785
return 0;
1786
}
1787
1788
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1789
"abcdefghijklmnopqrstuvwxyz"
1790
"0123456789"
1791
"_.-");
1792
if((direntry->d_name)[sret] != '\0'){
1793
/* Contains non-allowed characters */
1794
if(debug){
1795
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1796
direntry->d_name);
1797
}
1798
return 0;
1799
}
1800
1801
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1802
if(ret == -1){
1803
if(debug){
1804
perror_plus("Could not stat hook");
1805
}
1806
return 0;
1807
}
1808
if(not (S_ISREG(st.st_mode))){
1809
/* Not a regular file */
1810
if(debug){
1811
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1812
direntry->d_name);
1813
}
1814
return 0;
1815
}
1816
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1817
/* Not executable */
1818
if(debug){
1819
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1820
direntry->d_name);
1821
}
1822
return 0;
1823
}
1824
if(debug){
1825
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1826
direntry->d_name);
1827
}
1828
return 1;
1829
}
1830
1831
__attribute__((nonnull, warn_unused_result))
1832
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1833
mandos_context *mc){
1834
int ret;
1835
struct timespec now;
1836
struct timespec waited_time;
1837
intmax_t block_time;
1838
1839
while(true){
1840
if(mc->current_server == NULL){
1841
if(debug){
1842
fprintf_plus(stderr, "Wait until first server is found."
1843
" No timeout!\n");
1844
}
1845
ret = avahi_simple_poll_iterate(s, -1);
1846
} else {
1847
if(debug){
1848
fprintf_plus(stderr, "Check current_server if we should run"
1849
" it, or wait\n");
1850
}
1851
/* the current time */
1852
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1853
if(ret == -1){
1854
perror_plus("clock_gettime");
1855
return -1;
1856
}
1857
/* Calculating in ms how long time between now and server
1858
who we visted longest time ago. Now - last seen. */
1859
waited_time.tv_sec = (now.tv_sec
1860
- mc->current_server->last_seen.tv_sec);
1861
waited_time.tv_nsec = (now.tv_nsec
1862
- mc->current_server->last_seen.tv_nsec);
1863
/* total time is 10s/10,000ms.
1864
Converting to s from ms by dividing by 1,000,
1865
and ns to ms by dividing by 1,000,000. */
1866
block_time = ((retry_interval
1867
- ((intmax_t)waited_time.tv_sec * 1000))
1868
- ((intmax_t)waited_time.tv_nsec / 1000000));
1869
1870
if(debug){
1871
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1872
block_time);
1873
}
1874
1875
if(block_time <= 0){
1876
ret = start_mandos_communication(mc->current_server->ip,
1877
mc->current_server->port,
1878
mc->current_server->if_index,
1879
mc->current_server->af, mc);
1880
if(ret == 0){
1881
avahi_simple_poll_quit(s);
1882
return 0;
1883
}
1884
ret = clock_gettime(CLOCK_MONOTONIC,
1885
&mc->current_server->last_seen);
1886
if(ret == -1){
1887
perror_plus("clock_gettime");
1888
return -1;
1889
}
1890
mc->current_server = mc->current_server->next;
1891
block_time = 0; /* Call avahi to find new Mandos
1892
servers, but don't block */
1893
}
1894
1895
ret = avahi_simple_poll_iterate(s, (int)block_time);
1896
}
1897
if(ret != 0){
1898
if(ret > 0 or errno != EINTR){
1899
return (ret != 1) ? ret : 0;
1900
}
1901
}
1902
}
1903
}
1904
1905
__attribute__((nonnull))
1906
void run_network_hooks(const char *mode, const char *interface,
1907
const float delay){
1908
struct dirent **direntries = NULL;
1909
if(hookdir_fd == -1){
1910
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1911
| O_CLOEXEC);
1912
if(hookdir_fd == -1){
1913
if(errno == ENOENT){
1914
if(debug){
1915
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1916
" found\n", hookdir);
1917
}
1918
} else {
1919
perror_plus("open");
1920
}
1921
return;
1922
}
1923
}
1924
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1925
runnable_hook, alphasort);
1926
if(numhooks == -1){
1927
perror_plus("scandir");
1928
return;
1929
}
1930
struct dirent *direntry;
1931
int ret;
1932
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1933
if(devnull == -1){
1934
perror_plus("open(\"/dev/null\", O_RDONLY)");
1935
return;
1936
}
1937
for(int i = 0; i < numhooks; i++){
1938
direntry = direntries[i];
1939
if(debug){
1940
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1941
direntry->d_name);
1942
}
1943
pid_t hook_pid = fork();
1944
if(hook_pid == 0){
1945
/* Child */
1946
/* Raise privileges */
1947
errno = raise_privileges_permanently();
1948
if(errno != 0){
1949
perror_plus("Failed to raise privileges");
1950
_exit(EX_NOPERM);
1951
}
1952
/* Set group */
1953
errno = 0;
1954
ret = setgid(0);
1955
if(ret == -1){
1956
perror_plus("setgid");
1957
_exit(EX_NOPERM);
1958
}
1959
/* Reset supplementary groups */
1960
errno = 0;
1961
ret = setgroups(0, NULL);
1962
if(ret == -1){
1963
perror_plus("setgroups");
1964
_exit(EX_NOPERM);
1965
}
1966
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1967
if(ret == -1){
1968
perror_plus("setenv");
1969
_exit(EX_OSERR);
1970
}
1971
ret = setenv("DEVICE", interface, 1);
1972
if(ret == -1){
1973
perror_plus("setenv");
1974
_exit(EX_OSERR);
1975
}
1976
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1977
if(ret == -1){
1978
perror_plus("setenv");
1979
_exit(EX_OSERR);
1980
}
1981
ret = setenv("MODE", mode, 1);
1982
if(ret == -1){
1983
perror_plus("setenv");
1984
_exit(EX_OSERR);
1985
}
1986
char *delaystring;
1987
ret = asprintf(&delaystring, "%f", (double)delay);
1988
if(ret == -1){
1989
perror_plus("asprintf");
1990
_exit(EX_OSERR);
1991
}
1992
ret = setenv("DELAY", delaystring, 1);
1993
if(ret == -1){
1994
free(delaystring);
1995
perror_plus("setenv");
1996
_exit(EX_OSERR);
1997
}
1998
free(delaystring);
1999
if(connect_to != NULL){
2000
ret = setenv("CONNECT", connect_to, 1);
2001
if(ret == -1){
2002
perror_plus("setenv");
2003
_exit(EX_OSERR);
2004
}
2005
}
2006
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2007
direntry->d_name,
2008
O_RDONLY));
2009
if(hook_fd == -1){
2010
perror_plus("openat");
2011
_exit(EXIT_FAILURE);
2012
}
2013
if(close(hookdir_fd) == -1){
2014
perror_plus("close");
2015
_exit(EXIT_FAILURE);
2016
}
2017
ret = dup2(devnull, STDIN_FILENO);
2018
if(ret == -1){
2019
perror_plus("dup2(devnull, STDIN_FILENO)");
2020
_exit(EX_OSERR);
2021
}
2022
ret = close(devnull);
2023
if(ret == -1){
2024
perror_plus("close");
2025
_exit(EX_OSERR);
2026
}
2027
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2028
if(ret == -1){
2029
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2030
_exit(EX_OSERR);
2031
}
2032
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2033
environ) == -1){
2034
perror_plus("fexecve");
2035
_exit(EXIT_FAILURE);
2036
}
2037
} else {
2038
if(hook_pid == -1){
2039
perror_plus("fork");
2040
free(direntry);
2041
continue;
2042
}
2043
int status;
2044
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2045
perror_plus("waitpid");
2046
free(direntry);
2047
continue;
2048
}
2049
if(WIFEXITED(status)){
2050
if(WEXITSTATUS(status) != 0){
2051
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2052
" with status %d\n", direntry->d_name,
2053
WEXITSTATUS(status));
2054
free(direntry);
2055
continue;
2056
}
2057
} else if(WIFSIGNALED(status)){
2058
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2059
" signal %d\n", direntry->d_name,
2060
WTERMSIG(status));
2061
free(direntry);
2062
continue;
2063
} else {
2064
fprintf_plus(stderr, "Warning: network hook \"%s\""
2065
" crashed\n", direntry->d_name);
2066
free(direntry);
2067
continue;
2068
}
2069
}
2070
if(debug){
2071
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2072
direntry->d_name);
2073
}
2074
free(direntry);
2075
}
2076
free(direntries);
2077
if(close(hookdir_fd) == -1){
2078
perror_plus("close");
2079
} else {
2080
hookdir_fd = -1;
2081
}
2082
close(devnull);
2083
}
2084
2085
__attribute__((nonnull, warn_unused_result))
2086
int bring_up_interface(const char *const interface,
2087
const float delay){
2088
int old_errno = errno;
2089
int ret;
2090
struct ifreq network;
2091
unsigned int if_index = if_nametoindex(interface);
2092
if(if_index == 0){
2093
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2094
errno = old_errno;
2095
return ENXIO;
2096
}
2097
2098
if(quit_now){
2099
errno = old_errno;
2100
return EINTR;
2101
}
2102
2103
if(not interface_is_up(interface)){
2104
int ret_errno = 0;
2105
int ioctl_errno = 0;
2106
if(not get_flags(interface, &network)){
2107
ret_errno = errno;
2108
fprintf_plus(stderr, "Failed to get flags for interface "
2109
"\"%s\"\n", interface);
2110
errno = old_errno;
2111
return ret_errno;
2112
}
2113
network.ifr_flags |= IFF_UP; /* set flag */
2114
2115
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2116
if(sd == -1){
2117
ret_errno = errno;
2118
perror_plus("socket");
2119
errno = old_errno;
2120
return ret_errno;
2121
}
2122
2123
if(quit_now){
2124
ret = close(sd);
2125
if(ret == -1){
2126
perror_plus("close");
2127
}
2128
errno = old_errno;
2129
return EINTR;
2130
}
2131
2132
if(debug){
2133
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2134
interface);
2135
}
2136
2137
/* Raise privileges */
2138
ret_errno = raise_privileges();
2139
if(ret_errno != 0){
2140
errno = ret_errno;
2141
perror_plus("Failed to raise privileges");
2142
}
2143
2144
#ifdef __linux__
2145
int ret_linux;
2146
bool restore_loglevel = false;
2147
if(ret_errno == 0){
2148
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2149
messages about the network interface to mess up the prompt */
2150
ret_linux = klogctl(8, NULL, 5);
2151
if(ret_linux == -1){
2152
perror_plus("klogctl");
2153
} else {
2154
restore_loglevel = true;
2155
}
2156
}
2157
#endif /* __linux__ */
2158
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2159
ioctl_errno = errno;
2160
#ifdef __linux__
2161
if(restore_loglevel){
2162
ret_linux = klogctl(7, NULL, 0);
2163
if(ret_linux == -1){
2164
perror_plus("klogctl");
2165
}
2166
}
2167
#endif /* __linux__ */
2168
2169
/* If raise_privileges() succeeded above */
2170
if(ret_errno == 0){
2171
/* Lower privileges */
2172
ret_errno = lower_privileges();
2173
if(ret_errno != 0){
2174
errno = ret_errno;
2175
perror_plus("Failed to lower privileges");
2176
}
2177
}
2178
2179
/* Close the socket */
2180
ret = close(sd);
2181
if(ret == -1){
2182
perror_plus("close");
2183
}
2184
2185
if(ret_setflags == -1){
2186
errno = ioctl_errno;
2187
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2188
errno = old_errno;
2189
return ioctl_errno;
2190
}
2191
} else if(debug){
2192
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2193
interface);
2194
}
2195
2196
/* Sleep checking until interface is running.
2197
Check every 0.25s, up to total time of delay */
2198
for(int i=0; i < delay * 4; i++){
2199
if(interface_is_running(interface)){
2200
break;
2201
}
2202
struct timespec sleeptime = { .tv_nsec = 250000000 };
2203
ret = nanosleep(&sleeptime, NULL);
2204
if(ret == -1 and errno != EINTR){
2205
perror_plus("nanosleep");
2206
}
2207
}
2208
2209
errno = old_errno;
2210
return 0;
2211
}
2212
2213
__attribute__((nonnull, warn_unused_result))
2214
int take_down_interface(const char *const interface){
2215
int old_errno = errno;
2216
struct ifreq network;
2217
unsigned int if_index = if_nametoindex(interface);
2218
if(if_index == 0){
2219
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2220
errno = old_errno;
2221
return ENXIO;
2222
}
2223
if(interface_is_up(interface)){
2224
int ret_errno = 0;
2225
int ioctl_errno = 0;
2226
if(not get_flags(interface, &network) and debug){
2227
ret_errno = errno;
2228
fprintf_plus(stderr, "Failed to get flags for interface "
2229
"\"%s\"\n", interface);
2230
errno = old_errno;
2231
return ret_errno;
2232
}
2233
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2234
2235
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2236
if(sd == -1){
2237
ret_errno = errno;
2238
perror_plus("socket");
2239
errno = old_errno;
2240
return ret_errno;
2241
}
2242
2243
if(debug){
2244
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2245
interface);
2246
}
2247
2248
/* Raise privileges */
2249
ret_errno = raise_privileges();
2250
if(ret_errno != 0){
2251
errno = ret_errno;
2252
perror_plus("Failed to raise privileges");
2253
}
2254
2255
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2256
ioctl_errno = errno;
2257
2258
/* If raise_privileges() succeeded above */
2259
if(ret_errno == 0){
2260
/* Lower privileges */
2261
ret_errno = lower_privileges();
2262
if(ret_errno != 0){
2263
errno = ret_errno;
2264
perror_plus("Failed to lower privileges");
2265
}
2266
}
2267
2268
/* Close the socket */
2269
int ret = close(sd);
2270
if(ret == -1){
2271
perror_plus("close");
2272
}
2273
2274
if(ret_setflags == -1){
2275
errno = ioctl_errno;
2276
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2277
errno = old_errno;
2278
return ioctl_errno;
2279
}
2280
} else if(debug){
2281
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2282
interface);
2283
}
2284
2285
errno = old_errno;
2286
return 0;
971
if(mc.simple_poll != NULL){
972
avahi_simple_poll_quit(mc.simple_poll);
973
}
974
errno = old_errno;
2287
975
}
2288
976
2289
977
int main(int argc, char *argv[]){
2290
mandos_context mc = { .server = NULL, .dh_bits = 0,
2291
.priority = "SECURE256:!CTYPE-X.509"
2292
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2293
.current_server = NULL, .interfaces = NULL,
2294
.interfaces_size = 0 };
2295
978
AvahiSServiceBrowser *sb = NULL;
2296
error_t ret_errno;
979
int error;
2297
980
int ret;
2298
981
intmax_t tmpmax;
2299
982
char *tmp;
2300
983
int exitcode = EXIT_SUCCESS;
2301
char *interfaces_to_take_down = NULL;
2302
size_t interfaces_to_take_down_size = 0;
2303
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2304
char old_tempdir[] = "/tmp/mandosXXXXXX";
2305
char *tempdir = NULL;
984
const char *interface = "eth0";
985
struct ifreq network;
986
int sd = -1;
987
bool take_down_interface = false;
988
uid_t uid;
989
gid_t gid;
990
char *connect_to = NULL;
991
char tempdir[] = "/tmp/mandosXXXXXX";
992
bool tempdir_created = false;
2306
993
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2307
994
const char *seckey = PATHDIR "/" SECKEY;
2308
995
const char *pubkey = PATHDIR "/" PUBKEY;
2309
const char *dh_params_file = NULL;
2310
char *interfaces_hooks = NULL;
2311
996
2312
997
bool gnutls_initialized = false;
2313
998
bool gpgme_initialized = false;
2314
999
float delay = 2.5f;
2315
double retry_interval = 10; /* 10s between trying a server and
2316
retrying the same server again */
2317
1000
2318
1001
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2319
1002
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2325
1008
errno = 0;
2326
1009
ret = setgid(gid);
2327
1010
if(ret == -1){
2328
perror_plus("setgid");
1011
perror("setgid");
2329
1012
}
2330
1013
2331
1014
/* Lower user privileges (temporarily) */
2332
1015
errno = 0;
2333
1016
ret = seteuid(uid);
2334
1017
if(ret == -1){
2335
perror_plus("seteuid");
1018
perror("seteuid");
2336
1019
}
2337
1020
2338
1021
if(quit_now){
2365
1048
.doc = "Bit length of the prime number used in the"
2366
1049
" Diffie-Hellman key exchange",
2367
1050
.group = 2 },
2368
{ .name = "dh-params", .key = 134,
2369
.arg = "FILE",
2370
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2371
" for the Diffie-Hellman key exchange",
2372
.group = 2 },
2373
1051
{ .name = "priority", .key = 130,
2374
1052
.arg = "STRING",
2375
1053
.doc = "GnuTLS priority string for the TLS handshake",
2378
1056
.arg = "SECONDS",
2379
1057
.doc = "Maximum delay to wait for interface startup",
2380
1058
.group = 2 },
2381
{ .name = "retry", .key = 132,
2382
.arg = "SECONDS",
2383
.doc = "Retry interval used when denied by the Mandos server",
2384
.group = 2 },
2385
{ .name = "network-hook-dir", .key = 133,
2386
.arg = "DIR",
2387
.doc = "Directory where network hooks are located",
2388
.group = 2 },
2389
/*
2390
* These reproduce what we would get without ARGP_NO_HELP
2391
*/
2392
{ .name = "help", .key = '?',
2393
.doc = "Give this help list", .group = -1 },
2394
{ .name = "usage", .key = -3,
2395
.doc = "Give a short usage message", .group = -1 },
2396
{ .name = "version", .key = 'V',
2397
.doc = "Print program version", .group = -1 },
2398
1059
{ .name = NULL }
2399
1060
};
2400
1061
2401
1062
error_t parse_opt(int key, char *arg,
2402
1063
struct argp_state *state){
2403
errno = 0;
2404
1064
switch(key){
2405
1065
case 128: /* --debug */
2406
1066
debug = true;
2409
1069
connect_to = arg;
2410
1070
break;
2411
1071
case 'i': /* --interface */
2412
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2413
arg, (int)',');
2414
if(ret_errno != 0){
2415
argp_error(state, "%s", strerror(ret_errno));
2416
}
1072
interface = arg;
2417
1073
break;
2418
1074
case 's': /* --seckey */
2419
1075
seckey = arg;
2426
1082
tmpmax = strtoimax(arg, &tmp, 10);
2427
1083
if(errno != 0 or tmp == arg or *tmp != '\0'
2428
1084
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2429
argp_error(state, "Bad number of DH bits");
1085
fprintf(stderr, "Bad number of DH bits\n");
1086
exit(EXIT_FAILURE);
2430
1087
}
2431
1088
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2432
1089
break;
2433
case 134: /* --dh-params */
2434
dh_params_file = arg;
2435
break;
2436
1090
case 130: /* --priority */
2437
1091
mc.priority = arg;
2438
1092
break;
2440
1094
errno = 0;
2441
1095
delay = strtof(arg, &tmp);
2442
1096
if(errno != 0 or tmp == arg or *tmp != '\0'){
2443
argp_error(state, "Bad delay");
2444
}
2445
case 132: /* --retry */
2446
errno = 0;
2447
retry_interval = strtod(arg, &tmp);
2448
if(errno != 0 or tmp == arg or *tmp != '\0'
2449
or (retry_interval * 1000) > INT_MAX
2450
or retry_interval < 0){
2451
argp_error(state, "Bad retry interval");
2452
}
2453
break;
2454
case 133: /* --network-hook-dir */
2455
hookdir = arg;
2456
break;
2457
/*
2458
* These reproduce what we would get without ARGP_NO_HELP
2459
*/
2460
case '?': /* --help */
2461
argp_state_help(state, state->out_stream,
2462
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2463
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2464
case -3: /* --usage */
2465
argp_state_help(state, state->out_stream,
2466
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2467
case 'V': /* --version */
2468
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2469
exit(argp_err_exit_status);
1097
fprintf(stderr, "Bad delay\n");
1098
exit(EXIT_FAILURE);
1099
}
1100
break;
1101
case ARGP_KEY_ARG:
1102
argp_usage(state);
1103
case ARGP_KEY_END:
2470
1104
break;
2471
1105
default:
2472
1106
return ARGP_ERR_UNKNOWN;
2473
1107
}
2474
return errno;
1108
return 0;
2475
1109
}
2476
1110
2477
1111
struct argp argp = { .options = options, .parser = parse_opt,
2478
1112
.args_doc = "",
2479
1113
.doc = "Mandos client -- Get and decrypt"
2480
1114
" passwords from a Mandos server" };
2481
ret_errno = argp_parse(&argp, argc, argv,
2482
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2483
switch(ret_errno){
2484
case 0:
2485
break;
2486
case ENOMEM:
2487
default:
2488
errno = ret_errno;
2489
perror_plus("argp_parse");
2490
exitcode = EX_OSERR;
2491
goto end;
2492
case EINVAL:
2493
exitcode = EX_USAGE;
2494
goto end;
2495
}
2496
}
2497
2498
{
2499
/* Work around Debian bug #633582:
2500
<https://bugs.debian.org/633582> */
2501
2502
/* Re-raise privileges */
2503
ret = raise_privileges();
2504
if(ret != 0){
2505
errno = ret;
2506
perror_plus("Failed to raise privileges");
2507
} else {
2508
struct stat st;
2509
2510
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2511
int seckey_fd = open(seckey, O_RDONLY);
2512
if(seckey_fd == -1){
2513
perror_plus("open");
2514
} else {
2515
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2516
if(ret == -1){
2517
perror_plus("fstat");
2518
} else {
2519
if(S_ISREG(st.st_mode)
2520
and st.st_uid == 0 and st.st_gid == 0){
2521
ret = fchown(seckey_fd, uid, gid);
2522
if(ret == -1){
2523
perror_plus("fchown");
2524
}
2525
}
2526
}
2527
close(seckey_fd);
2528
}
2529
}
2530
2531
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2532
int pubkey_fd = open(pubkey, O_RDONLY);
2533
if(pubkey_fd == -1){
2534
perror_plus("open");
2535
} else {
2536
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2537
if(ret == -1){
2538
perror_plus("fstat");
2539
} else {
2540
if(S_ISREG(st.st_mode)
2541
and st.st_uid == 0 and st.st_gid == 0){
2542
ret = fchown(pubkey_fd, uid, gid);
2543
if(ret == -1){
2544
perror_plus("fchown");
2545
}
2546
}
2547
}
2548
close(pubkey_fd);
2549
}
2550
}
2551
2552
if(dh_params_file != NULL
2553
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2554
int dhparams_fd = open(dh_params_file, O_RDONLY);
2555
if(dhparams_fd == -1){
2556
perror_plus("open");
2557
} else {
2558
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2559
if(ret == -1){
2560
perror_plus("fstat");
2561
} else {
2562
if(S_ISREG(st.st_mode)
2563
and st.st_uid == 0 and st.st_gid == 0){
2564
ret = fchown(dhparams_fd, uid, gid);
2565
if(ret == -1){
2566
perror_plus("fchown");
2567
}
2568
}
2569
}
2570
close(dhparams_fd);
2571
}
2572
}
2573
2574
/* Lower privileges */
2575
ret = lower_privileges();
2576
if(ret != 0){
2577
errno = ret;
2578
perror_plus("Failed to lower privileges");
2579
}
2580
}
2581
}
2582
2583
/* Remove invalid interface names (except "none") */
2584
{
2585
char *interface = NULL;
2586
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2587
interface))){
2588
if(strcmp(interface, "none") != 0
2589
and if_nametoindex(interface) == 0){
2590
if(interface[0] != '\0'){
2591
fprintf_plus(stderr, "Not using nonexisting interface"
2592
" \"%s\"\n", interface);
2593
}
2594
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2595
interface = NULL;
2596
}
2597
}
2598
}
2599
2600
/* Run network hooks */
2601
{
2602
if(mc.interfaces != NULL){
2603
interfaces_hooks = malloc(mc.interfaces_size);
2604
if(interfaces_hooks == NULL){
2605
perror_plus("malloc");
2606
goto end;
2607
}
2608
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2609
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2610
}
2611
run_network_hooks("start", interfaces_hooks != NULL ?
2612
interfaces_hooks : "", delay);
1115
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1116
if(ret == ARGP_ERR_UNKNOWN){
1117
fprintf(stderr, "Unknown error while parsing arguments\n");
1118
exitcode = EXIT_FAILURE;
1119
goto end;
1120
}
2613
1121
}
2614
1122
2615
1123
if(not debug){
2620
1128
from the signal handler */
2621
1129
/* Initialize the pseudo-RNG for Avahi */
2622
1130
srand((unsigned int) time(NULL));
2623
simple_poll = avahi_simple_poll_new();
2624
if(simple_poll == NULL){
2625
fprintf_plus(stderr,
2626
"Avahi: Failed to create simple poll object.\n");
2627
exitcode = EX_UNAVAILABLE;
1131
mc.simple_poll = avahi_simple_poll_new();
1132
if(mc.simple_poll == NULL){
1133
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1134
exitcode = EXIT_FAILURE;
2628
1135
goto end;
2629
1136
}
2630
1137
2631
1138
sigemptyset(&sigterm_action.sa_mask);
2632
1139
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2633
1140
if(ret == -1){
2634
perror_plus("sigaddset");
2635
exitcode = EX_OSERR;
1141
perror("sigaddset");
1142
exitcode = EXIT_FAILURE;
2636
1143
goto end;
2637
1144
}
2638
1145
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2639
1146
if(ret == -1){
2640
perror_plus("sigaddset");
2641
exitcode = EX_OSERR;
1147
perror("sigaddset");
1148
exitcode = EXIT_FAILURE;
2642
1149
goto end;
2643
1150
}
2644
1151
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2645
1152
if(ret == -1){
2646
perror_plus("sigaddset");
2647
exitcode = EX_OSERR;
1153
perror("sigaddset");
1154
exitcode = EXIT_FAILURE;
2648
1155
goto end;
2649
1156
}
2650
1157
/* Need to check if the handler is SIG_IGN before handling:
2653
1160
*/
2654
1161
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2655
1162
if(ret == -1){
2656
perror_plus("sigaction");
2657
return EX_OSERR;
1163
perror("sigaction");
1164
return EXIT_FAILURE;
2658
1165
}
2659
1166
if(old_sigterm_action.sa_handler != SIG_IGN){
2660
1167
ret = sigaction(SIGINT, &sigterm_action, NULL);
2661
1168
if(ret == -1){
2662
perror_plus("sigaction");
2663
exitcode = EX_OSERR;
1169
perror("sigaction");
1170
exitcode = EXIT_FAILURE;
2664
1171
goto end;
2665
1172
}
2666
1173
}
2667
1174
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2668
1175
if(ret == -1){
2669
perror_plus("sigaction");
2670
return EX_OSERR;
1176
perror("sigaction");
1177
return EXIT_FAILURE;
2671
1178
}
2672
1179
if(old_sigterm_action.sa_handler != SIG_IGN){
2673
1180
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2674
1181
if(ret == -1){
2675
perror_plus("sigaction");
2676
exitcode = EX_OSERR;
1182
perror("sigaction");
1183
exitcode = EXIT_FAILURE;
2677
1184
goto end;
2678
1185
}
2679
1186
}
2680
1187
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2681
1188
if(ret == -1){
2682
perror_plus("sigaction");
2683
return EX_OSERR;
1189
perror("sigaction");
1190
return EXIT_FAILURE;
2684
1191
}
2685
1192
if(old_sigterm_action.sa_handler != SIG_IGN){
2686
1193
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2687
1194
if(ret == -1){
2688
perror_plus("sigaction");
2689
exitcode = EX_OSERR;
1195
perror("sigaction");
1196
exitcode = EXIT_FAILURE;
2690
1197
goto end;
2691
1198
}
2692
1199
}
2693
1200
2694
/* If no interfaces were specified, make a list */
2695
if(mc.interfaces == NULL){
2696
struct dirent **direntries = NULL;
2697
/* Look for any good interfaces */
2698
ret = scandir(sys_class_net, &direntries, good_interface,
2699
alphasort);
2700
if(ret >= 1){
2701
/* Add all found interfaces to interfaces list */
2702
for(int i = 0; i < ret; ++i){
2703
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2704
direntries[i]->d_name);
2705
if(ret_errno != 0){
2706
errno = ret_errno;
2707
perror_plus("argz_add");
2708
free(direntries[i]);
2709
continue;
2710
}
2711
if(debug){
2712
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2713
direntries[i]->d_name);
2714
}
2715
free(direntries[i]);
2716
}
2717
free(direntries);
1201
/* If the interface is down, bring it up */
1202
if(interface[0] != '\0'){
1203
if_index = (AvahiIfIndex) if_nametoindex(interface);
1204
if(if_index == 0){
1205
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1206
exitcode = EXIT_FAILURE;
1207
goto end;
1208
}
1209
1210
if(quit_now){
1211
goto end;
1212
}
1213
1214
/* Re-raise priviliges */
1215
errno = 0;
1216
ret = seteuid(0);
1217
if(ret == -1){
1218
perror("seteuid");
1219
}
1220
1221
#ifdef __linux__
1222
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1223
messages to mess up the prompt */
1224
ret = klogctl(8, NULL, 5);
1225
bool restore_loglevel = true;
1226
if(ret == -1){
1227
restore_loglevel = false;
1228
perror("klogctl");
1229
}
1230
#endif /* __linux__ */
1231
1232
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1233
if(sd < 0){
1234
perror("socket");
1235
exitcode = EXIT_FAILURE;
1236
#ifdef __linux__
1237
if(restore_loglevel){
1238
ret = klogctl(7, NULL, 0);
1239
if(ret == -1){
1240
perror("klogctl");
1241
}
1242
}
1243
#endif /* __linux__ */
1244
/* Lower privileges */
1245
errno = 0;
1246
ret = seteuid(uid);
1247
if(ret == -1){
1248
perror("seteuid");
1249
}
1250
goto end;
1251
}
1252
strcpy(network.ifr_name, interface);
1253
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1254
if(ret == -1){
1255
perror("ioctl SIOCGIFFLAGS");
1256
#ifdef __linux__
1257
if(restore_loglevel){
1258
ret = klogctl(7, NULL, 0);
1259
if(ret == -1){
1260
perror("klogctl");
1261
}
1262
}
1263
#endif /* __linux__ */
1264
exitcode = EXIT_FAILURE;
1265
/* Lower privileges */
1266
errno = 0;
1267
ret = seteuid(uid);
1268
if(ret == -1){
1269
perror("seteuid");
1270
}
1271
goto end;
1272
}
1273
if((network.ifr_flags & IFF_UP) == 0){
1274
network.ifr_flags |= IFF_UP;
1275
take_down_interface = true;
1276
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1277
if(ret == -1){
1278
take_down_interface = false;
1279
perror("ioctl SIOCSIFFLAGS");
1280
exitcode = EXIT_FAILURE;
1281
#ifdef __linux__
1282
if(restore_loglevel){
1283
ret = klogctl(7, NULL, 0);
1284
if(ret == -1){
1285
perror("klogctl");
1286
}
1287
}
1288
#endif /* __linux__ */
1289
/* Lower privileges */
1290
errno = 0;
1291
ret = seteuid(uid);
1292
if(ret == -1){
1293
perror("seteuid");
1294
}
1295
goto end;
1296
}
1297
}
1298
/* sleep checking until interface is running */
1299
for(int i=0; i < delay * 4; i++){
1300
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1301
if(ret == -1){
1302
perror("ioctl SIOCGIFFLAGS");
1303
} else if(network.ifr_flags & IFF_RUNNING){
1304
break;
1305
}
1306
struct timespec sleeptime = { .tv_nsec = 250000000 };
1307
ret = nanosleep(&sleeptime, NULL);
1308
if(ret == -1 and errno != EINTR){
1309
perror("nanosleep");
1310
}
1311
}
1312
if(not take_down_interface){
1313
/* We won't need the socket anymore */
1314
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1315
if(ret == -1){
1316
perror("close");
1317
}
1318
}
1319
#ifdef __linux__
1320
if(restore_loglevel){
1321
/* Restores kernel loglevel to default */
1322
ret = klogctl(7, NULL, 0);
1323
if(ret == -1){
1324
perror("klogctl");
1325
}
1326
}
1327
#endif /* __linux__ */
1328
/* Lower privileges */
1329
errno = 0;
1330
if(take_down_interface){
1331
/* Lower privileges */
1332
ret = seteuid(uid);
1333
if(ret == -1){
1334
perror("seteuid");
1335
}
2718
1336
} else {
2719
if(ret == 0){
2720
free(direntries);
2721
}
2722
fprintf_plus(stderr, "Could not find a network interface\n");
2723
exitcode = EXIT_FAILURE;
2724
goto end;
2725
}
2726
}
2727
2728
/* Bring up interfaces which are down, and remove any "none"s */
2729
{
2730
char *interface = NULL;
2731
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2732
interface))){
2733
/* If interface name is "none", stop bringing up interfaces.
2734
Also remove all instances of "none" from the list */
2735
if(strcmp(interface, "none") == 0){
2736
argz_delete(&mc.interfaces, &mc.interfaces_size,
2737
interface);
2738
interface = NULL;
2739
while((interface = argz_next(mc.interfaces,
2740
mc.interfaces_size, interface))){
2741
if(strcmp(interface, "none") == 0){
2742
argz_delete(&mc.interfaces, &mc.interfaces_size,
2743
interface);
2744
interface = NULL;
2745
}
2746
}
2747
break;
2748
}
2749
bool interface_was_up = interface_is_up(interface);
2750
errno = bring_up_interface(interface, delay);
2751
if(not interface_was_up){
2752
if(errno != 0){
2753
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2754
" %s\n", interface, strerror(errno));
2755
} else {
2756
errno = argz_add(&interfaces_to_take_down,
2757
&interfaces_to_take_down_size,
2758
interface);
2759
if(errno != 0){
2760
perror_plus("argz_add");
2761
}
2762
}
2763
}
2764
}
2765
if(debug and (interfaces_to_take_down == NULL)){
2766
fprintf_plus(stderr, "No interfaces were brought up\n");
2767
}
2768
}
2769
2770
/* If we only got one interface, explicitly use only that one */
2771
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2772
if(debug){
2773
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2774
mc.interfaces);
2775
}
2776
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1337
/* Lower privileges permanently */
1338
ret = setuid(uid);
1339
if(ret == -1){
1340
perror("setuid");
1341
}
1342
}
2777
1343
}
2778
1344
2779
1345
if(quit_now){
2780
1346
goto end;
2781
1347
}
2782
1348
2783
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1349
ret = init_gnutls_global(pubkey, seckey);
2784
1350
if(ret == -1){
2785
fprintf_plus(stderr, "init_gnutls_global failed\n");
2786
exitcode = EX_UNAVAILABLE;
1351
fprintf(stderr, "init_gnutls_global failed\n");
1352
exitcode = EXIT_FAILURE;
2787
1353
goto end;
2788
1354
} else {
2789
1355
gnutls_initialized = true;
2793
1359
goto end;
2794
1360
}
2795
1361
2796
/* Try /run/tmp before /tmp */
2797
tempdir = mkdtemp(run_tempdir);
2798
if(tempdir == NULL and errno == ENOENT){
2799
if(debug){
2800
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2801
run_tempdir, old_tempdir);
2802
}
2803
tempdir = mkdtemp(old_tempdir);
2804
}
2805
if(tempdir == NULL){
2806
perror_plus("mkdtemp");
1362
tempdir_created = true;
1363
if(mkdtemp(tempdir) == NULL){
1364
tempdir_created = false;
1365
perror("mkdtemp");
2807
1366
goto end;
2808
1367
}
2809
1368
2811
1370
goto end;
2812
1371
}
2813
1372
2814
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2815
fprintf_plus(stderr, "init_gpgme failed\n");
2816
exitcode = EX_UNAVAILABLE;
1373
if(not init_gpgme(pubkey, seckey, tempdir)){
1374
fprintf(stderr, "init_gpgme failed\n");
1375
exitcode = EXIT_FAILURE;
2817
1376
goto end;
2818
1377
} else {
2819
1378
gpgme_initialized = true;
2827
1386
/* Connect directly, do not use Zeroconf */
2828
1387
/* (Mainly meant for debugging) */
2829
1388
char *address = strrchr(connect_to, ':');
2830
2831
1389
if(address == NULL){
2832
fprintf_plus(stderr, "No colon in address\n");
2833
exitcode = EX_USAGE;
1390
fprintf(stderr, "No colon in address\n");
1391
exitcode = EXIT_FAILURE;
2834
1392
goto end;
2835
1393
}
2836
1394
2838
1396
goto end;
2839
1397
}
2840
1398
2841
in_port_t port;
1399
uint16_t port;
2842
1400
errno = 0;
2843
1401
tmpmax = strtoimax(address+1, &tmp, 10);
2844
1402
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2845
or tmpmax != (in_port_t)tmpmax){
2846
fprintf_plus(stderr, "Bad port number\n");
2847
exitcode = EX_USAGE;
1403
or tmpmax != (uint16_t)tmpmax){
1404
fprintf(stderr, "Bad port number\n");
1405
exitcode = EXIT_FAILURE;
2848
1406
goto end;
2849
1407
}
2850
1408
2851
1409
if(quit_now){
2852
1410
goto end;
2853
1411
}
2854
1412
2855
port = (in_port_t)tmpmax;
1413
port = (uint16_t)tmpmax;
2856
1414
*address = '\0';
1415
address = connect_to;
2857
1416
/* Colon in address indicates IPv6 */
2858
1417
int af;
2859
if(strchr(connect_to, ':') != NULL){
1418
if(strchr(address, ':') != NULL){
2860
1419
af = AF_INET6;
2861
/* Accept [] around IPv6 address - see RFC 5952 */
2862
if(connect_to[0] == '[' and address[-1] == ']')
2863
{
2864
connect_to++;
2865
address[-1] = '\0';
2866
}
2867
1420
} else {
2868
1421
af = AF_INET;
2869
1422
}
2870
address = connect_to;
2871
1423
2872
1424
if(quit_now){
2873
1425
goto end;
2874
1426
}
2875
1427
2876
while(not quit_now){
2877
ret = start_mandos_communication(address, port, if_index, af,
2878
&mc);
2879
if(quit_now or ret == 0){
2880
break;
2881
}
2882
if(debug){
2883
fprintf_plus(stderr, "Retrying in %d seconds\n",
2884
(int)retry_interval);
2885
}
2886
sleep((unsigned int)retry_interval);
2887
}
2888
2889
if(not quit_now){
1428
ret = start_mandos_communication(address, port, if_index, af);
1429
if(ret < 0){
1430
exitcode = EXIT_FAILURE;
1431
} else {
2890
1432
exitcode = EXIT_SUCCESS;
2891
1433
}
2892
2893
1434
goto end;
2894
1435
}
2895
1436
2907
1448
config.publish_domain = 0;
2908
1449
2909
1450
/* Allocate a new server */
2910
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2911
&config, NULL, NULL, &ret);
1451
mc.server = avahi_server_new(avahi_simple_poll_get
1452
(mc.simple_poll), &config, NULL,
1453
NULL, &error);
2912
1454
2913
1455
/* Free the Avahi configuration data */
2914
1456
avahi_server_config_free(&config);
2916
1458
2917
1459
/* Check if creating the Avahi server object succeeded */
2918
1460
if(mc.server == NULL){
2919
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2920
avahi_strerror(ret));
2921
exitcode = EX_UNAVAILABLE;
1461
fprintf(stderr, "Failed to create Avahi server: %s\n",
1462
avahi_strerror(error));
1463
exitcode = EXIT_FAILURE;
2922
1464
goto end;
2923
1465
}
2924
1466
2929
1471
/* Create the Avahi service browser */
2930
1472
sb = avahi_s_service_browser_new(mc.server, if_index,
2931
1473
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2932
NULL, 0, browse_callback,
2933
(void *)&mc);
1474
NULL, 0, browse_callback, NULL);
2934
1475
if(sb == NULL){
2935
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2936
avahi_strerror(avahi_server_errno(mc.server)));
2937
exitcode = EX_UNAVAILABLE;
1476
fprintf(stderr, "Failed to create service browser: %s\n",
1477
avahi_strerror(avahi_server_errno(mc.server)));
1478
exitcode = EXIT_FAILURE;
2938
1479
goto end;
2939
1480
}
2940
1481
2945
1486
/* Run the main loop */
2946
1487
2947
1488
if(debug){
2948
fprintf_plus(stderr, "Starting Avahi loop search\n");
1489
fprintf(stderr, "Starting Avahi loop search\n");
2949
1490
}
2950
1491
2951
ret = avahi_loop_with_timeout(simple_poll,
2952
(int)(retry_interval * 1000), &mc);
2953
if(debug){
2954
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2955
(ret == 0) ? "successfully" : "with error");
2956
}
1492
avahi_simple_poll_loop(mc.simple_poll);
2957
1493
2958
1494
end:
2959
1495
2960
1496
if(debug){
2961
if(signal_received){
2962
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2963
argv[0], signal_received,
2964
strsignal(signal_received));
2965
} else {
2966
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2967
}
1497
fprintf(stderr, "%s exiting\n", argv[0]);
2968
1498
}
2969
1499
2970
1500
/* Cleanup things */
2971
free(mc.interfaces);
2972
2973
1501
if(sb != NULL)
2974
1502
avahi_s_service_browser_free(sb);
2975
1503
2976
1504
if(mc.server != NULL)
2977
1505
avahi_server_free(mc.server);
2978
1506
2979
if(simple_poll != NULL)
2980
avahi_simple_poll_free(simple_poll);
1507
if(mc.simple_poll != NULL)
1508
avahi_simple_poll_free(mc.simple_poll);
2981
1509
2982
1510
if(gnutls_initialized){
2983
1511
gnutls_certificate_free_credentials(mc.cred);
1512
gnutls_global_deinit();
2984
1513
gnutls_dh_params_deinit(mc.dh_params);
2985
1514
}
2986
1515
2988
1517
gpgme_release(mc.ctx);
2989
1518
}
2990
1519
2991
/* Cleans up the circular linked list of Mandos servers the client
2992
has seen */
2993
if(mc.current_server != NULL){
2994
mc.current_server->prev->next = NULL;
2995
while(mc.current_server != NULL){
2996
server *next = mc.current_server->next;
2997
#ifdef __GNUC__
2998
#pragma GCC diagnostic push
2999
#pragma GCC diagnostic ignored "-Wcast-qual"
3000
#endif
3001
free((char *)(mc.current_server->ip));
3002
#ifdef __GNUC__
3003
#pragma GCC diagnostic pop
3004
#endif
3005
free(mc.current_server);
3006
mc.current_server = next;
3007
}
3008
}
3009
3010
/* Re-raise privileges */
3011
{
3012
ret = raise_privileges();
3013
if(ret != 0){
3014
errno = ret;
3015
perror_plus("Failed to raise privileges");
3016
} else {
3017
3018
/* Run network hooks */
3019
run_network_hooks("stop", interfaces_hooks != NULL ?
3020
interfaces_hooks : "", delay);
3021
3022
/* Take down the network interfaces which were brought up */
3023
{
3024
char *interface = NULL;
3025
while((interface=argz_next(interfaces_to_take_down,
3026
interfaces_to_take_down_size,
3027
interface))){
3028
ret = take_down_interface(interface);
3029
if(ret != 0){
3030
errno = ret;
3031
perror_plus("Failed to take down interface");
3032
}
3033
}
3034
if(debug and (interfaces_to_take_down == NULL)){
3035
fprintf_plus(stderr, "No interfaces needed to be taken"
3036
" down\n");
3037
}
3038
}
3039
}
3040
3041
ret = lower_privileges_permanently();
3042
if(ret != 0){
3043
errno = ret;
3044
perror_plus("Failed to lower privileges permanently");
3045
}
3046
}
3047
3048
free(interfaces_to_take_down);
3049
free(interfaces_hooks);
3050
3051
void clean_dir_at(int base, const char * const dirname,
3052
uintmax_t level){
3053
struct dirent **direntries = NULL;
3054
int dret;
3055
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3056
O_RDONLY
3057
| O_NOFOLLOW
3058
| O_DIRECTORY
3059
| O_PATH));
3060
if(dir_fd == -1){
3061
perror_plus("open");
3062
}
3063
int numentries = scandirat(dir_fd, ".", &direntries,
3064
notdotentries, alphasort);
3065
if(numentries >= 0){
3066
for(int i = 0; i < numentries; i++){
3067
if(debug){
3068
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3069
dirname, direntries[i]->d_name);
3070
}
3071
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3072
if(dret == -1){
3073
if(errno == EISDIR){
3074
dret = unlinkat(dir_fd, direntries[i]->d_name,
3075
AT_REMOVEDIR);
3076
}
3077
if((dret == -1) and (errno == ENOTEMPTY)
3078
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3079
== 0) and (level == 0)){
3080
/* Recurse only in this special case */
3081
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3082
dret = 0;
3083
}
3084
if(dret == -1){
3085
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3086
direntries[i]->d_name, strerror(errno));
3087
}
3088
}
3089
free(direntries[i]);
3090
}
3091
3092
/* need to clean even if 0 because man page doesn't specify */
3093
free(direntries);
3094
if(numentries == -1){
3095
perror_plus("scandirat");
3096
}
3097
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3098
if(dret == -1 and errno != ENOENT){
3099
perror_plus("rmdir");
3100
}
3101
} else {
3102
perror_plus("scandirat");
3103
}
3104
close(dir_fd);
3105
}
3106
3107
/* Removes the GPGME temp directory and all files inside */
3108
if(tempdir != NULL){
3109
clean_dir_at(-1, tempdir, 0);
1520
/* Take down the network interface */
1521
if(take_down_interface){
1522
/* Re-raise priviliges */
1523
errno = 0;
1524
ret = seteuid(0);
1525
if(ret == -1){
1526
perror("seteuid");
1527
}
1528
if(geteuid() == 0){
1529
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1530
if(ret == -1){
1531
perror("ioctl SIOCGIFFLAGS");
1532
} else if(network.ifr_flags & IFF_UP) {
1533
network.ifr_flags &= ~IFF_UP; /* clear flag */
1534
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1535
if(ret == -1){
1536
perror("ioctl SIOCSIFFLAGS");
1537
}
1538
}
1539
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1540
if(ret == -1){
1541
perror("close");
1542
}
1543
/* Lower privileges permanently */
1544
errno = 0;
1545
ret = setuid(uid);
1546
if(ret == -1){
1547
perror("setuid");
1548
}
1549
}
1550
}
1551
1552
/* Removes the temp directory used by GPGME */
1553
if(tempdir_created){
1554
DIR *d;
1555
struct dirent *direntry;
1556
d = opendir(tempdir);
1557
if(d == NULL){
1558
if(errno != ENOENT){
1559
perror("opendir");
1560
}
1561
} else {
1562
while(true){
1563
direntry = readdir(d);
1564
if(direntry == NULL){
1565
break;
1566
}
1567
/* Skip "." and ".." */
1568
if(direntry->d_name[0] == '.'
1569
and (direntry->d_name[1] == '\0'
1570
or (direntry->d_name[1] == '.'
1571
and direntry->d_name[2] == '\0'))){
1572
continue;
1573
}
1574
char *fullname = NULL;
1575
ret = asprintf(&fullname, "%s/%s", tempdir,
1576
direntry->d_name);
1577
if(ret < 0){
1578
perror("asprintf");
1579
continue;
1580
}
1581
ret = remove(fullname);
1582
if(ret == -1){
1583
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1584
strerror(errno));
1585
}
1586
free(fullname);
1587
}
1588
closedir(d);
1589
}
1590
ret = rmdir(tempdir);
1591
if(ret == -1 and errno != ENOENT){
1592
perror("rmdir");
1593
}
3110
1594
}
3111
1595
3112
1596
if(quit_now){
3116
1600
&old_sigterm_action,
3117
1601
NULL));
3118
1602
if(ret == -1){
3119
perror_plus("sigaction");
1603
perror("sigaction");
3120
1604
}
3121
1605
do {
3122
1606
ret = raise(signal_received);
3123
1607
} while(ret != 0 and errno == EINTR);
3124
1608
if(ret != 0){
3125
perror_plus("raise");
1609
perror("raise");
3126
1610
abort();
3127
1611
}
3128
1612
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0