(root)/mandos/release
» Revision
237.7.441
(compared to revision 237.16.2)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2017-02-21 18:23:54 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 358.
- Revision ID: teddy@recompile.se-20170221182354-qjl75f74t02bbm5n
Suppress lintian warning about lsb-base dependency
This warning is erroneous since we do depend on lsb-base, we just also
depend on systemd-sysv as an alternative, since if that is installed,
the /etc/init.d/mandos script (which is the thing which actually
requires lsb-base) is never run anyway. Suppress this warning.
* debian/mandos.lintian-overrides (mandos): Add new line
"init.d-script-needs-depends-on-lsb-base etc/init.d/mandos (line
49)"
This warning is erroneous since we do depend on lsb-base, we just also
depend on systemd-sysv as an alternative, since if that is installed,
the /etc/init.d/mandos script (which is the thing which actually
requires lsb-base) is never run anyway. Suppress this warning.
* debian/mandos.lintian-overrides (mandos): Add new line
"init.d-script-needs-depends-on-lsb-base etc/init.d/mandos (line
49)"
- files added:
- bugs.xml
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 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
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy(), strsignal()
51
*/
51
52
#include <sys/ioctl.h> /* ioctl */
52
53
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
54
sockaddr_in6, PF_INET6,
55
56
opendir(), DIR */
56
57
#include <sys/stat.h> /* open(), S_ISREG */
57
58
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
59
inet_pton(), connect(),
60
getnameinfo() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
62
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
63
*/
62
64
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
65
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
66
71
program_invocation_short_name */
67
72
#include <time.h> /* nanosleep(), time(), sleep() */
68
73
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
78
*/
74
79
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
80
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
81
setgid(), pause(), _exit(),
82
unlinkat() */
83
#include <arpa/inet.h> /* inet_pton(), htons() */
78
84
#include <iso646.h> /* not, or, and */
79
85
#include <argp.h> /* struct argp_option, error_t, struct
80
86
argp_state, struct argp,
85
91
raise() */
86
92
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
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() */
88
103
89
104
#ifdef __linux__
90
105
#include <sys/klog.h> /* klogctl() */
108
123
init_gnutls_session(),
109
124
GNUTLS_* */
110
125
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
126
/* gnutls_certificate_set_openpgp_key_file(),
127
GNUTLS_OPENPGP_FMT_BASE64 */
113
128
114
129
/* GPGME */
115
130
#include <gpgme.h> /* All GPGME types, constants and
131
146
const char *argp_program_bug_address = "<mandos@recompile.se>";
132
147
static const char sys_class_net[] = "/sys/class/net";
133
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;
134
153
135
154
/* Doubly linked list that need to be circularly linked when used */
136
155
typedef struct server{
137
156
const char *ip;
138
uint16_t port;
157
in_port_t port;
139
158
AvahiIfIndex if_index;
140
159
int af;
141
160
struct timespec last_seen;
145
164
146
165
/* Used for passing in values through the Avahi callback functions */
147
166
typedef struct {
148
AvahiSimplePoll *simple_poll;
149
167
AvahiServer *server;
150
168
gnutls_certificate_credentials_t cred;
151
169
unsigned int dh_bits;
153
171
const char *priority;
154
172
gpgme_ctx_t ctx;
155
173
server *current_server;
174
char *interfaces;
175
size_t interfaces_size;
156
176
} mandos_context;
157
177
158
/* global context so signal handler can reach it*/
159
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
178
/* global so signal handler can reach it*/
179
AvahiSimplePoll *simple_poll;
163
180
164
181
sig_atomic_t quit_now = 0;
165
182
int signal_received = 0;
166
183
167
184
/* Function to use when printing errors */
168
185
void perror_plus(const char *print_text){
186
int e = errno;
169
187
fprintf(stderr, "Mandos plugin %s: ",
170
188
program_invocation_short_name);
189
errno = e;
171
190
perror(print_text);
172
191
}
173
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
174
203
/*
175
204
* Make additional room in "buffer" for at least BUFFER_SIZE more
176
205
* bytes. "buffer_capacity" is how much is currently allocated,
177
206
* "buffer_length" is how much is already used.
178
207
*/
208
__attribute__((nonnull, warn_unused_result))
179
209
size_t incbuffer(char **buffer, size_t buffer_length,
180
size_t buffer_capacity){
210
size_t buffer_capacity){
181
211
if(buffer_length + BUFFER_SIZE > buffer_capacity){
182
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
183
if(buffer == NULL){
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;
184
218
return 0;
185
219
}
220
*buffer = new_buf;
186
221
buffer_capacity += BUFFER_SIZE;
187
222
}
188
223
return buffer_capacity;
189
224
}
190
225
191
226
/* Add server to set of servers to retry periodically */
192
int add_server(const char *ip, uint16_t port,
193
AvahiIfIndex if_index,
194
int af){
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){
195
230
int ret;
196
231
server *new_server = malloc(sizeof(server));
197
232
if(new_server == NULL){
198
233
perror_plus("malloc");
199
return -1;
234
return false;
200
235
}
201
236
*new_server = (server){ .ip = strdup(ip),
202
.port = port,
203
.if_index = if_index,
204
.af = af };
237
.port = port,
238
.if_index = if_index,
239
.af = af };
205
240
if(new_server->ip == NULL){
206
241
perror_plus("strdup");
207
return -1;
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;
208
258
}
209
259
/* Special case of first server */
210
if (mc.current_server == NULL){
260
if(*current_server == NULL){
211
261
new_server->next = new_server;
212
262
new_server->prev = new_server;
213
mc.current_server = new_server;
214
/* Place the new server last in the list */
263
*current_server = new_server;
215
264
} else {
216
new_server->next = mc.current_server;
217
new_server->prev = mc.current_server->prev;
265
/* Place the new server last in the list */
266
new_server->next = *current_server;
267
new_server->prev = (*current_server)->prev;
218
268
new_server->prev->next = new_server;
219
mc.current_server->prev = new_server;
220
}
221
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
222
if(ret == -1){
223
perror_plus("clock_gettime");
224
return -1;
225
}
226
return 0;
269
(*current_server)->prev = new_server;
270
}
271
return true;
227
272
}
228
273
229
274
/*
230
275
* Initialize GPGME.
231
276
*/
232
static bool init_gpgme(const char *seckey,
233
const char *pubkey, const char *tempdir){
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){
234
282
gpgme_error_t rc;
235
283
gpgme_engine_info_t engine_info;
236
284
237
238
285
/*
239
286
* Helper function to insert pub and seckey to the engine keyring.
240
287
*/
241
bool import_key(const char *filename){
288
bool import_key(const char * const filename){
242
289
int ret;
243
290
int fd;
244
291
gpgme_data_t pgp_data;
251
298
252
299
rc = gpgme_data_new_from_fd(&pgp_data, fd);
253
300
if(rc != GPG_ERR_NO_ERROR){
254
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
255
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
256
303
return false;
257
304
}
258
305
259
rc = gpgme_op_import(mc.ctx, pgp_data);
306
rc = gpgme_op_import(mc->ctx, pgp_data);
260
307
if(rc != GPG_ERR_NO_ERROR){
261
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
262
gpgme_strsource(rc), gpgme_strerror(rc));
308
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
263
310
return false;
264
311
}
265
312
266
ret = (int)TEMP_FAILURE_RETRY(close(fd));
313
ret = close(fd);
267
314
if(ret == -1){
268
315
perror_plus("close");
269
316
}
272
319
}
273
320
274
321
if(debug){
275
fprintf(stderr, "Initializing GPGME\n");
322
fprintf_plus(stderr, "Initializing GPGME\n");
276
323
}
277
324
278
325
/* Init GPGME */
279
326
gpgme_check_version(NULL);
280
327
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
281
328
if(rc != GPG_ERR_NO_ERROR){
282
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
329
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
330
gpgme_strsource(rc), gpgme_strerror(rc));
284
331
return false;
285
332
}
286
333
287
334
/* Set GPGME home directory for the OpenPGP engine only */
288
335
rc = gpgme_get_engine_info(&engine_info);
289
336
if(rc != GPG_ERR_NO_ERROR){
290
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
337
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
338
gpgme_strsource(rc), gpgme_strerror(rc));
292
339
return false;
293
340
}
294
341
while(engine_info != NULL){
300
347
engine_info = engine_info->next;
301
348
}
302
349
if(engine_info == NULL){
303
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
350
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
351
tempdir);
304
352
return false;
305
353
}
306
354
307
355
/* Create new GPGME "context" */
308
rc = gpgme_new(&(mc.ctx));
356
rc = gpgme_new(&(mc->ctx));
309
357
if(rc != GPG_ERR_NO_ERROR){
310
fprintf(stderr, "bad gpgme_new: %s: %s\n",
311
gpgme_strsource(rc), gpgme_strerror(rc));
358
fprintf_plus(stderr, "Mandos plugin mandos-client: "
359
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
360
gpgme_strerror(rc));
312
361
return false;
313
362
}
314
363
323
372
* Decrypt OpenPGP data.
324
373
* Returns -1 on error
325
374
*/
375
__attribute__((nonnull, warn_unused_result))
326
376
static ssize_t pgp_packet_decrypt(const char *cryptotext,
327
377
size_t crypto_size,
328
char **plaintext){
378
char **plaintext,
379
mandos_context *mc){
329
380
gpgme_data_t dh_crypto, dh_plain;
330
381
gpgme_error_t rc;
331
382
ssize_t ret;
333
384
ssize_t plaintext_length = 0;
334
385
335
386
if(debug){
336
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
387
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
337
388
}
338
389
339
390
/* Create new GPGME data buffer from memory cryptotext */
340
391
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
341
392
0);
342
393
if(rc != GPG_ERR_NO_ERROR){
343
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
344
gpgme_strsource(rc), gpgme_strerror(rc));
394
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
395
gpgme_strsource(rc), gpgme_strerror(rc));
345
396
return -1;
346
397
}
347
398
348
399
/* Create new empty GPGME data buffer for the plaintext */
349
400
rc = gpgme_data_new(&dh_plain);
350
401
if(rc != GPG_ERR_NO_ERROR){
351
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
402
fprintf_plus(stderr, "Mandos plugin mandos-client: "
403
"bad gpgme_data_new: %s: %s\n",
404
gpgme_strsource(rc), gpgme_strerror(rc));
353
405
gpgme_data_release(dh_crypto);
354
406
return -1;
355
407
}
356
408
357
409
/* Decrypt data from the cryptotext data buffer to the plaintext
358
410
data buffer */
359
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
411
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
360
412
if(rc != GPG_ERR_NO_ERROR){
361
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
362
gpgme_strsource(rc), gpgme_strerror(rc));
413
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
414
gpgme_strsource(rc), gpgme_strerror(rc));
363
415
plaintext_length = -1;
364
416
if(debug){
365
417
gpgme_decrypt_result_t result;
366
result = gpgme_op_decrypt_result(mc.ctx);
418
result = gpgme_op_decrypt_result(mc->ctx);
367
419
if(result == NULL){
368
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
420
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
369
421
} else {
370
fprintf(stderr, "Unsupported algorithm: %s\n",
371
result->unsupported_algorithm);
372
fprintf(stderr, "Wrong key usage: %u\n",
373
result->wrong_key_usage);
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);
374
426
if(result->file_name != NULL){
375
fprintf(stderr, "File name: %s\n", result->file_name);
427
fprintf_plus(stderr, "File name: %s\n", result->file_name);
376
428
}
377
429
gpgme_recipient_t recipient;
378
430
recipient = result->recipients;
379
431
while(recipient != NULL){
380
fprintf(stderr, "Public key algorithm: %s\n",
381
gpgme_pubkey_algo_name(recipient->pubkey_algo));
382
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
383
fprintf(stderr, "Secret key available: %s\n",
384
recipient->status == GPG_ERR_NO_SECKEY
385
? "No" : "Yes");
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");
386
439
recipient = recipient->next;
387
440
}
388
441
}
391
444
}
392
445
393
446
if(debug){
394
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
447
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
395
448
}
396
449
397
450
/* Seek back to the beginning of the GPGME plaintext data buffer */
404
457
*plaintext = NULL;
405
458
while(true){
406
459
plaintext_capacity = incbuffer(plaintext,
407
(size_t)plaintext_length,
408
plaintext_capacity);
460
(size_t)plaintext_length,
461
plaintext_capacity);
409
462
if(plaintext_capacity == 0){
410
perror_plus("incbuffer");
411
plaintext_length = -1;
412
goto decrypt_end;
463
perror_plus("incbuffer");
464
plaintext_length = -1;
465
goto decrypt_end;
413
466
}
414
467
415
468
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
428
481
}
429
482
430
483
if(debug){
431
fprintf(stderr, "Decrypted password is: ");
484
fprintf_plus(stderr, "Decrypted password is: ");
432
485
for(ssize_t i = 0; i < plaintext_length; i++){
433
486
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
434
487
}
445
498
return plaintext_length;
446
499
}
447
500
448
static const char * safer_gnutls_strerror(int value){
449
const char *ret = gnutls_strerror(value); /* Spurious warning from
450
-Wunreachable-code */
451
if(ret == NULL)
452
ret = "(unknown)";
453
return ret;
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);
454
512
}
455
513
456
514
/* GnuTLS log function callback */
515
__attribute__((nonnull))
457
516
static void debuggnutls(__attribute__((unused)) int level,
458
517
const char* string){
459
fprintf(stderr, "GnuTLS: %s", string);
518
fprintf_plus(stderr, "GnuTLS: %s", string);
460
519
}
461
520
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
462
522
static int init_gnutls_global(const char *pubkeyfilename,
463
const char *seckeyfilename){
523
const char *seckeyfilename,
524
const char *dhparamsfilename,
525
mandos_context *mc){
464
526
int ret;
527
unsigned int uret;
465
528
466
529
if(debug){
467
fprintf(stderr, "Initializing GnuTLS\n");
468
}
469
470
ret = gnutls_global_init();
471
if(ret != GNUTLS_E_SUCCESS){
472
fprintf(stderr, "GnuTLS global_init: %s\n",
473
safer_gnutls_strerror(ret));
474
return -1;
530
fprintf_plus(stderr, "Initializing GnuTLS\n");
475
531
}
476
532
477
533
if(debug){
483
539
}
484
540
485
541
/* OpenPGP credentials */
486
ret = gnutls_certificate_allocate_credentials(&mc.cred);
542
ret = gnutls_certificate_allocate_credentials(&mc->cred);
487
543
if(ret != GNUTLS_E_SUCCESS){
488
fprintf(stderr, "GnuTLS memory error: %s\n",
489
safer_gnutls_strerror(ret));
490
gnutls_global_deinit();
544
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
safer_gnutls_strerror(ret));
491
546
return -1;
492
547
}
493
548
494
549
if(debug){
495
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
496
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
497
seckeyfilename);
550
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
551
" secret key %s as GnuTLS credentials\n",
552
pubkeyfilename,
553
seckeyfilename);
498
554
}
499
555
500
556
ret = gnutls_certificate_set_openpgp_key_file
501
(mc.cred, pubkeyfilename, seckeyfilename,
557
(mc->cred, pubkeyfilename, seckeyfilename,
502
558
GNUTLS_OPENPGP_FMT_BASE64);
503
559
if(ret != GNUTLS_E_SUCCESS){
504
fprintf(stderr,
505
"Error[%d] while reading the OpenPGP key pair ('%s',"
506
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
507
fprintf(stderr, "The GnuTLS error is: %s\n",
508
safer_gnutls_strerror(ret));
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));
509
565
goto globalfail;
510
566
}
511
567
512
568
/* GnuTLS server initialization */
513
ret = gnutls_dh_params_init(&mc.dh_params);
514
if(ret != GNUTLS_E_SUCCESS){
515
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
516
" %s\n", safer_gnutls_strerror(ret));
517
goto globalfail;
518
}
519
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
520
if(ret != GNUTLS_E_SUCCESS){
521
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
522
safer_gnutls_strerror(ret));
523
goto globalfail;
524
}
525
526
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
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
free(params.data);
630
} while(false);
631
}
632
if(dhparamsfilename == NULL){
633
if(mc->dh_bits == 0){
634
/* Find out the optimal number of DH bits */
635
/* Try to read the private key file */
636
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
637
do {
638
int secfile = open(seckeyfilename, O_RDONLY);
639
if(secfile == -1){
640
perror_plus("open");
641
break;
642
}
643
size_t buffer_capacity = 0;
644
while(true){
645
buffer_capacity = incbuffer((char **)&buffer.data,
646
(size_t)buffer.size,
647
(size_t)buffer_capacity);
648
if(buffer_capacity == 0){
649
perror_plus("incbuffer");
650
free(buffer.data);
651
buffer.data = NULL;
652
break;
653
}
654
ssize_t bytes_read = read(secfile,
655
buffer.data + buffer.size,
656
BUFFER_SIZE);
657
/* EOF */
658
if(bytes_read == 0){
659
break;
660
}
661
/* check bytes_read for failure */
662
if(bytes_read < 0){
663
perror_plus("read");
664
free(buffer.data);
665
buffer.data = NULL;
666
break;
667
}
668
buffer.size += (unsigned int)bytes_read;
669
}
670
close(secfile);
671
} while(false);
672
/* If successful, use buffer to parse private key */
673
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
674
if(buffer.data != NULL){
675
{
676
gnutls_openpgp_privkey_t privkey = NULL;
677
ret = gnutls_openpgp_privkey_init(&privkey);
678
if(ret != GNUTLS_E_SUCCESS){
679
fprintf_plus(stderr, "Error initializing OpenPGP key"
680
" structure: %s",
681
safer_gnutls_strerror(ret));
682
free(buffer.data);
683
buffer.data = NULL;
684
} else {
685
ret = gnutls_openpgp_privkey_import
686
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
687
if(ret != GNUTLS_E_SUCCESS){
688
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
689
safer_gnutls_strerror(ret));
690
privkey = NULL;
691
}
692
free(buffer.data);
693
buffer.data = NULL;
694
if(privkey != NULL){
695
/* Use private key to suggest an appropriate
696
sec_param */
697
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
698
gnutls_openpgp_privkey_deinit(privkey);
699
if(debug){
700
fprintf_plus(stderr, "This OpenPGP key implies using"
701
" a GnuTLS security parameter \"%s\".\n",
702
safe_string(gnutls_sec_param_get_name
703
(sec_param)));
704
}
705
}
706
}
707
}
708
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
709
/* Err on the side of caution */
710
sec_param = GNUTLS_SEC_PARAM_ULTRA;
711
if(debug){
712
fprintf_plus(stderr, "Falling back to security parameter"
713
" \"%s\"\n",
714
safe_string(gnutls_sec_param_get_name
715
(sec_param)));
716
}
717
}
718
}
719
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
720
if(uret != 0){
721
mc->dh_bits = uret;
722
if(debug){
723
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
724
" implies %u DH bits; using that.\n",
725
safe_string(gnutls_sec_param_get_name
726
(sec_param)),
727
mc->dh_bits);
728
}
729
} else {
730
fprintf_plus(stderr, "Failed to get implied number of DH"
731
" bits for security parameter \"%s\"): %s\n",
732
safe_string(gnutls_sec_param_get_name
733
(sec_param)),
734
safer_gnutls_strerror(ret));
735
goto globalfail;
736
}
737
} else if(debug){
738
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
739
mc->dh_bits);
740
}
741
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
742
if(ret != GNUTLS_E_SUCCESS){
743
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
744
" bits): %s\n", mc->dh_bits,
745
safer_gnutls_strerror(ret));
746
goto globalfail;
747
}
748
}
749
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
527
750
528
751
return 0;
529
752
530
753
globalfail:
531
754
532
gnutls_certificate_free_credentials(mc.cred);
533
gnutls_global_deinit();
534
gnutls_dh_params_deinit(mc.dh_params);
755
gnutls_certificate_free_credentials(mc->cred);
756
gnutls_dh_params_deinit(mc->dh_params);
535
757
return -1;
536
758
}
537
759
538
static int init_gnutls_session(gnutls_session_t *session){
760
__attribute__((nonnull, warn_unused_result))
761
static int init_gnutls_session(gnutls_session_t *session,
762
mandos_context *mc){
539
763
int ret;
540
764
/* GnuTLS session creation */
541
765
do {
545
769
}
546
770
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
547
771
if(ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
549
safer_gnutls_strerror(ret));
772
fprintf_plus(stderr,
773
"Error in GnuTLS session initialization: %s\n",
774
safer_gnutls_strerror(ret));
550
775
}
551
776
552
777
{
553
778
const char *err;
554
779
do {
555
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
780
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
556
781
if(quit_now){
557
782
gnutls_deinit(*session);
558
783
return -1;
559
784
}
560
785
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
561
786
if(ret != GNUTLS_E_SUCCESS){
562
fprintf(stderr, "Syntax error at: %s\n", err);
563
fprintf(stderr, "GnuTLS error: %s\n",
564
safer_gnutls_strerror(ret));
787
fprintf_plus(stderr, "Syntax error at: %s\n", err);
788
fprintf_plus(stderr, "GnuTLS error: %s\n",
789
safer_gnutls_strerror(ret));
565
790
gnutls_deinit(*session);
566
791
return -1;
567
792
}
569
794
570
795
do {
571
796
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
572
mc.cred);
797
mc->cred);
573
798
if(quit_now){
574
799
gnutls_deinit(*session);
575
800
return -1;
576
801
}
577
802
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
578
803
if(ret != GNUTLS_E_SUCCESS){
579
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
580
safer_gnutls_strerror(ret));
804
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
805
safer_gnutls_strerror(ret));
581
806
gnutls_deinit(*session);
582
807
return -1;
583
808
}
585
810
/* ignore client certificate if any. */
586
811
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
587
812
588
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
589
590
813
return 0;
591
814
}
592
815
594
817
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
595
818
__attribute__((unused)) const char *txt){}
596
819
820
/* Set effective uid to 0, return errno */
821
__attribute__((warn_unused_result))
822
int raise_privileges(void){
823
int old_errno = errno;
824
int ret = 0;
825
if(seteuid(0) == -1){
826
ret = errno;
827
}
828
errno = old_errno;
829
return ret;
830
}
831
832
/* Set effective and real user ID to 0. Return errno. */
833
__attribute__((warn_unused_result))
834
int raise_privileges_permanently(void){
835
int old_errno = errno;
836
int ret = raise_privileges();
837
if(ret != 0){
838
errno = old_errno;
839
return ret;
840
}
841
if(setuid(0) == -1){
842
ret = errno;
843
}
844
errno = old_errno;
845
return ret;
846
}
847
848
/* Set effective user ID to unprivileged saved user ID */
849
__attribute__((warn_unused_result))
850
int lower_privileges(void){
851
int old_errno = errno;
852
int ret = 0;
853
if(seteuid(uid) == -1){
854
ret = errno;
855
}
856
errno = old_errno;
857
return ret;
858
}
859
860
/* Lower privileges permanently */
861
__attribute__((warn_unused_result))
862
int lower_privileges_permanently(void){
863
int old_errno = errno;
864
int ret = 0;
865
if(setuid(uid) == -1){
866
ret = errno;
867
}
868
errno = old_errno;
869
return ret;
870
}
871
872
/* Helper function to add_local_route() and delete_local_route() */
873
__attribute__((nonnull, warn_unused_result))
874
static bool add_delete_local_route(const bool add,
875
const char *address,
876
AvahiIfIndex if_index){
877
int ret;
878
char helper[] = "mandos-client-iprouteadddel";
879
char add_arg[] = "add";
880
char delete_arg[] = "delete";
881
char debug_flag[] = "--debug";
882
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
883
if(pluginhelperdir == NULL){
884
if(debug){
885
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
886
" variable not set; cannot run helper\n");
887
}
888
return false;
889
}
890
891
char interface[IF_NAMESIZE];
892
if(if_indextoname((unsigned int)if_index, interface) == NULL){
893
perror_plus("if_indextoname");
894
return false;
895
}
896
897
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
898
if(devnull == -1){
899
perror_plus("open(\"/dev/null\", O_RDONLY)");
900
return false;
901
}
902
pid_t pid = fork();
903
if(pid == 0){
904
/* Child */
905
/* Raise privileges */
906
errno = raise_privileges_permanently();
907
if(errno != 0){
908
perror_plus("Failed to raise privileges");
909
/* _exit(EX_NOPERM); */
910
} else {
911
/* Set group */
912
errno = 0;
913
ret = setgid(0);
914
if(ret == -1){
915
perror_plus("setgid");
916
_exit(EX_NOPERM);
917
}
918
/* Reset supplementary groups */
919
errno = 0;
920
ret = setgroups(0, NULL);
921
if(ret == -1){
922
perror_plus("setgroups");
923
_exit(EX_NOPERM);
924
}
925
}
926
ret = dup2(devnull, STDIN_FILENO);
927
if(ret == -1){
928
perror_plus("dup2(devnull, STDIN_FILENO)");
929
_exit(EX_OSERR);
930
}
931
ret = close(devnull);
932
if(ret == -1){
933
perror_plus("close");
934
_exit(EX_OSERR);
935
}
936
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
937
if(ret == -1){
938
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
939
_exit(EX_OSERR);
940
}
941
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
942
O_RDONLY
943
| O_DIRECTORY
944
| O_PATH
945
| O_CLOEXEC));
946
if(helperdir_fd == -1){
947
perror_plus("open");
948
_exit(EX_UNAVAILABLE);
949
}
950
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
951
helper, O_RDONLY));
952
if(helper_fd == -1){
953
perror_plus("openat");
954
close(helperdir_fd);
955
_exit(EX_UNAVAILABLE);
956
}
957
close(helperdir_fd);
958
#ifdef __GNUC__
959
#pragma GCC diagnostic push
960
#pragma GCC diagnostic ignored "-Wcast-qual"
961
#endif
962
if(fexecve(helper_fd, (char *const [])
963
{ helper, add ? add_arg : delete_arg, (char *)address,
964
interface, debug ? debug_flag : NULL, NULL },
965
environ) == -1){
966
#ifdef __GNUC__
967
#pragma GCC diagnostic pop
968
#endif
969
perror_plus("fexecve");
970
_exit(EXIT_FAILURE);
971
}
972
}
973
if(pid == -1){
974
perror_plus("fork");
975
return false;
976
}
977
int status;
978
pid_t pret = -1;
979
errno = 0;
980
do {
981
pret = waitpid(pid, &status, 0);
982
if(pret == -1 and errno == EINTR and quit_now){
983
int errno_raising = 0;
984
if((errno = raise_privileges()) != 0){
985
errno_raising = errno;
986
perror_plus("Failed to raise privileges in order to"
987
" kill helper program");
988
}
989
if(kill(pid, SIGTERM) == -1){
990
perror_plus("kill");
991
}
992
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
993
perror_plus("Failed to lower privileges after killing"
994
" helper program");
995
}
996
return false;
997
}
998
} while(pret == -1 and errno == EINTR);
999
if(pret == -1){
1000
perror_plus("waitpid");
1001
return false;
1002
}
1003
if(WIFEXITED(status)){
1004
if(WEXITSTATUS(status) != 0){
1005
fprintf_plus(stderr, "Error: iprouteadddel exited"
1006
" with status %d\n", WEXITSTATUS(status));
1007
return false;
1008
}
1009
return true;
1010
}
1011
if(WIFSIGNALED(status)){
1012
fprintf_plus(stderr, "Error: iprouteadddel died by"
1013
" signal %d\n", WTERMSIG(status));
1014
return false;
1015
}
1016
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1017
return false;
1018
}
1019
1020
__attribute__((nonnull, warn_unused_result))
1021
static bool add_local_route(const char *address,
1022
AvahiIfIndex if_index){
1023
if(debug){
1024
fprintf_plus(stderr, "Adding route to %s\n", address);
1025
}
1026
return add_delete_local_route(true, address, if_index);
1027
}
1028
1029
__attribute__((nonnull, warn_unused_result))
1030
static bool delete_local_route(const char *address,
1031
AvahiIfIndex if_index){
1032
if(debug){
1033
fprintf_plus(stderr, "Removing route to %s\n", address);
1034
}
1035
return add_delete_local_route(false, address, if_index);
1036
}
1037
597
1038
/* Called when a Mandos server is found */
598
static int start_mandos_communication(const char *ip, uint16_t port,
1039
__attribute__((nonnull, warn_unused_result))
1040
static int start_mandos_communication(const char *ip, in_port_t port,
599
1041
AvahiIfIndex if_index,
600
int af){
1042
int af, mandos_context *mc){
601
1043
int ret, tcp_sd = -1;
602
1044
ssize_t sret;
603
union {
604
struct sockaddr_in in;
605
struct sockaddr_in6 in6;
606
} to;
1045
struct sockaddr_storage to;
607
1046
char *buffer = NULL;
608
1047
char *decrypted_buffer = NULL;
609
1048
size_t buffer_length = 0;
612
1051
int retval = -1;
613
1052
gnutls_session_t session;
614
1053
int pf; /* Protocol family */
1054
bool route_added = false;
615
1055
616
1056
errno = 0;
617
1057
628
1068
pf = PF_INET;
629
1069
break;
630
1070
default:
631
fprintf(stderr, "Bad address family: %d\n", af);
1071
fprintf_plus(stderr, "Bad address family: %d\n", af);
632
1072
errno = EINVAL;
633
1073
return -1;
634
1074
}
635
1075
636
ret = init_gnutls_session(&session);
1076
/* If the interface is specified and we have a list of interfaces */
1077
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1078
/* Check if the interface is one of the interfaces we are using */
1079
bool match = false;
1080
{
1081
char *interface = NULL;
1082
while((interface = argz_next(mc->interfaces,
1083
mc->interfaces_size,
1084
interface))){
1085
if(if_nametoindex(interface) == (unsigned int)if_index){
1086
match = true;
1087
break;
1088
}
1089
}
1090
}
1091
if(not match){
1092
/* This interface does not match any in the list, so we don't
1093
connect to the server */
1094
if(debug){
1095
char interface[IF_NAMESIZE];
1096
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1097
perror_plus("if_indextoname");
1098
} else {
1099
fprintf_plus(stderr, "Skipping server on non-used interface"
1100
" \"%s\"\n",
1101
if_indextoname((unsigned int)if_index,
1102
interface));
1103
}
1104
}
1105
return -1;
1106
}
1107
}
1108
1109
ret = init_gnutls_session(&session, mc);
637
1110
if(ret != 0){
638
1111
return -1;
639
1112
}
640
1113
641
1114
if(debug){
642
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
643
"\n", ip, port);
1115
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1116
PRIuMAX "\n", ip, (uintmax_t)port);
644
1117
}
645
1118
646
tcp_sd = socket(pf, SOCK_STREAM, 0);
1119
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
647
1120
if(tcp_sd < 0){
648
1121
int e = errno;
649
1122
perror_plus("socket");
656
1129
goto mandos_end;
657
1130
}
658
1131
659
memset(&to, 0, sizeof(to));
660
1132
if(af == AF_INET6){
661
to.in6.sin6_family = (sa_family_t)af;
662
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1133
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1134
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1135
ret = inet_pton(af, ip, &to6->sin6_addr);
663
1136
} else { /* IPv4 */
664
to.in.sin_family = (sa_family_t)af;
665
ret = inet_pton(af, ip, &to.in.sin_addr);
1137
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1138
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1139
ret = inet_pton(af, ip, &to4->sin_addr);
666
1140
}
667
1141
if(ret < 0 ){
668
1142
int e = errno;
672
1146
}
673
1147
if(ret == 0){
674
1148
int e = errno;
675
fprintf(stderr, "Bad address: %s\n", ip);
1149
fprintf_plus(stderr, "Bad address: %s\n", ip);
676
1150
errno = e;
677
1151
goto mandos_end;
678
1152
}
679
1153
if(af == AF_INET6){
680
to.in6.sin6_port = htons(port); /* Spurious warnings from
681
-Wconversion and
682
-Wunreachable-code */
683
684
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
685
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
686
-Wunreachable-code*/
1154
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1155
if(IN6_IS_ADDR_LINKLOCAL
1156
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
687
1157
if(if_index == AVAHI_IF_UNSPEC){
688
fprintf(stderr, "An IPv6 link-local address is incomplete"
689
" without a network interface\n");
1158
fprintf_plus(stderr, "An IPv6 link-local address is"
1159
" incomplete without a network interface\n");
690
1160
errno = EINVAL;
691
1161
goto mandos_end;
692
1162
}
693
1163
/* Set the network interface number as scope */
694
to.in6.sin6_scope_id = (uint32_t)if_index;
1164
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
695
1165
}
696
1166
} else {
697
to.in.sin_port = htons(port); /* Spurious warnings from
698
-Wconversion and
699
-Wunreachable-code */
1167
((struct sockaddr_in *)&to)->sin_port = htons(port);
700
1168
}
701
1169
702
1170
if(quit_now){
710
1178
if(if_indextoname((unsigned int)if_index, interface) == NULL){
711
1179
perror_plus("if_indextoname");
712
1180
} else {
713
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
714
ip, interface, port);
1181
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1182
"\n", ip, interface, (uintmax_t)port);
715
1183
}
716
1184
} else {
717
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
718
port);
1185
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1186
ip, (uintmax_t)port);
719
1187
}
720
1188
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
721
1189
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
722
const char *pcret;
723
if(af == AF_INET6){
724
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
725
sizeof(addrstr));
726
} else {
727
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
728
sizeof(addrstr));
729
}
730
if(pcret == NULL){
731
perror_plus("inet_ntop");
732
} else {
733
if(strcmp(addrstr, ip) != 0){
734
fprintf(stderr, "Canonical address form: %s\n", addrstr);
735
}
736
}
737
}
738
739
if(quit_now){
740
errno = EINTR;
741
goto mandos_end;
742
}
743
744
if(af == AF_INET6){
745
ret = connect(tcp_sd, &to.in6, sizeof(to));
746
} else {
747
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
748
}
749
if(ret < 0){
750
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
751
int e = errno;
752
perror_plus("connect");
753
errno = e;
754
}
755
goto mandos_end;
756
}
757
758
if(quit_now){
759
errno = EINTR;
760
goto mandos_end;
1190
if(af == AF_INET6){
1191
ret = getnameinfo((struct sockaddr *)&to,
1192
sizeof(struct sockaddr_in6),
1193
addrstr, sizeof(addrstr), NULL, 0,
1194
NI_NUMERICHOST);
1195
} else {
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in),
1198
addrstr, sizeof(addrstr), NULL, 0,
1199
NI_NUMERICHOST);
1200
}
1201
if(ret == EAI_SYSTEM){
1202
perror_plus("getnameinfo");
1203
} else if(ret != 0) {
1204
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1205
} else if(strcmp(addrstr, ip) != 0){
1206
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1207
}
1208
}
1209
1210
if(quit_now){
1211
errno = EINTR;
1212
goto mandos_end;
1213
}
1214
1215
while(true){
1216
if(af == AF_INET6){
1217
ret = connect(tcp_sd, (struct sockaddr *)&to,
1218
sizeof(struct sockaddr_in6));
1219
} else {
1220
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1221
sizeof(struct sockaddr_in));
1222
}
1223
if(ret < 0){
1224
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1225
and if_index != AVAHI_IF_UNSPEC
1226
and connect_to == NULL
1227
and not route_added and
1228
((af == AF_INET6 and not
1229
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1230
&to)->sin6_addr)))
1231
or (af == AF_INET and
1232
/* Not a a IPv4LL address */
1233
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1234
& 0xFFFF0000L) != 0xA9FE0000L))){
1235
/* Work around Avahi bug - Avahi does not announce link-local
1236
addresses if it has a global address, so local hosts with
1237
*only* a link-local address (e.g. Mandos clients) cannot
1238
connect to a Mandos server announced by Avahi on a server
1239
host with a global address. Work around this by retrying
1240
with an explicit route added with the server's address.
1241
1242
Avahi bug reference:
1243
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://bugs.debian.org/587961
1245
*/
1246
if(debug){
1247
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
" direct route\n");
1249
}
1250
int e = errno;
1251
route_added = add_local_route(ip, if_index);
1252
if(route_added){
1253
continue;
1254
}
1255
errno = e;
1256
}
1257
if(errno != ECONNREFUSED or debug){
1258
int e = errno;
1259
perror_plus("connect");
1260
errno = e;
1261
}
1262
goto mandos_end;
1263
}
1264
1265
if(quit_now){
1266
errno = EINTR;
1267
goto mandos_end;
1268
}
1269
break;
761
1270
}
762
1271
763
1272
const char *out = mandos_protocol_version;
765
1274
while(true){
766
1275
size_t out_size = strlen(out);
767
1276
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
768
out_size - written));
1277
out_size - written));
769
1278
if(ret == -1){
770
1279
int e = errno;
771
1280
perror_plus("write");
791
1300
}
792
1301
793
1302
if(debug){
794
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1303
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
795
1304
}
796
1305
797
1306
if(quit_now){
799
1308
goto mandos_end;
800
1309
}
801
1310
802
/* Spurious warning from -Wint-to-pointer-cast */
803
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1311
/* This casting via intptr_t is to eliminate warning about casting
1312
an int to a pointer type. This is exactly how the GnuTLS Guile
1313
function "set-session-transport-fd!" does it. */
1314
gnutls_transport_set_ptr(session,
1315
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
804
1316
805
1317
if(quit_now){
806
1318
errno = EINTR;
817
1329
818
1330
if(ret != GNUTLS_E_SUCCESS){
819
1331
if(debug){
820
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1332
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
821
1333
gnutls_perror(ret);
822
1334
}
823
1335
errno = EPROTO;
827
1339
/* Read OpenPGP packet that contains the wanted password */
828
1340
829
1341
if(debug){
830
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
831
ip);
1342
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1343
" %s\n", ip);
832
1344
}
833
1345
834
1346
while(true){
839
1351
}
840
1352
841
1353
buffer_capacity = incbuffer(&buffer, buffer_length,
842
buffer_capacity);
1354
buffer_capacity);
843
1355
if(buffer_capacity == 0){
844
1356
int e = errno;
845
1357
perror_plus("incbuffer");
872
1384
}
873
1385
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
874
1386
if(ret < 0){
875
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1387
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1388
"***\n");
876
1389
gnutls_perror(ret);
877
1390
errno = EPROTO;
878
1391
goto mandos_end;
879
1392
}
880
1393
break;
881
1394
default:
882
fprintf(stderr, "Unknown error while reading data from"
883
" encrypted session with Mandos server\n");
1395
fprintf_plus(stderr, "Unknown error while reading data from"
1396
" encrypted session with Mandos server\n");
884
1397
gnutls_bye(session, GNUTLS_SHUT_RDWR);
885
1398
errno = EIO;
886
1399
goto mandos_end;
891
1404
}
892
1405
893
1406
if(debug){
894
fprintf(stderr, "Closing TLS session\n");
1407
fprintf_plus(stderr, "Closing TLS session\n");
895
1408
}
896
1409
897
1410
if(quit_now){
909
1422
910
1423
if(buffer_length > 0){
911
1424
ssize_t decrypted_buffer_size;
912
decrypted_buffer_size = pgp_packet_decrypt(buffer,
913
buffer_length,
914
&decrypted_buffer);
1425
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1426
&decrypted_buffer, mc);
915
1427
if(decrypted_buffer_size >= 0){
916
1428
1429
clearerr(stdout);
917
1430
written = 0;
918
1431
while(written < (size_t) decrypted_buffer_size){
919
1432
if(quit_now){
927
1440
if(ret == 0 and ferror(stdout)){
928
1441
int e = errno;
929
1442
if(debug){
930
fprintf(stderr, "Error writing encrypted data: %s\n",
931
strerror(errno));
1443
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1444
strerror(errno));
932
1445
}
933
1446
errno = e;
934
1447
goto mandos_end;
935
1448
}
936
1449
written += (size_t)ret;
937
1450
}
1451
ret = fflush(stdout);
1452
if(ret != 0){
1453
int e = errno;
1454
if(debug){
1455
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1456
strerror(errno));
1457
}
1458
errno = e;
1459
goto mandos_end;
1460
}
938
1461
retval = 0;
939
1462
}
940
1463
}
943
1466
944
1467
mandos_end:
945
1468
{
1469
if(route_added){
1470
if(not delete_local_route(ip, if_index)){
1471
fprintf_plus(stderr, "Failed to delete local route to %s on"
1472
" interface %d", ip, if_index);
1473
}
1474
}
946
1475
int e = errno;
947
1476
free(decrypted_buffer);
948
1477
free(buffer);
949
1478
if(tcp_sd >= 0){
950
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1479
ret = close(tcp_sd);
951
1480
}
952
1481
if(ret == -1){
953
1482
if(e == 0){
965
1494
return retval;
966
1495
}
967
1496
1497
__attribute__((nonnull))
968
1498
static void resolve_callback(AvahiSServiceResolver *r,
969
1499
AvahiIfIndex interface,
970
1500
AvahiProtocol proto,
978
1508
AVAHI_GCC_UNUSED AvahiStringList *txt,
979
1509
AVAHI_GCC_UNUSED AvahiLookupResultFlags
980
1510
flags,
981
AVAHI_GCC_UNUSED void* userdata){
982
assert(r);
1511
void *mc){
1512
if(r == NULL){
1513
return;
1514
}
983
1515
984
1516
/* Called whenever a service has been resolved successfully or
985
1517
timed out */
986
1518
987
1519
if(quit_now){
1520
avahi_s_service_resolver_free(r);
988
1521
return;
989
1522
}
990
1523
991
1524
switch(event){
992
1525
default:
993
1526
case AVAHI_RESOLVER_FAILURE:
994
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
995
" of type '%s' in domain '%s': %s\n", name, type, domain,
996
avahi_strerror(avahi_server_errno(mc.server)));
1527
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1528
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1529
domain,
1530
avahi_strerror(avahi_server_errno
1531
(((mandos_context*)mc)->server)));
997
1532
break;
998
1533
999
1534
case AVAHI_RESOLVER_FOUND:
1001
1536
char ip[AVAHI_ADDRESS_STR_MAX];
1002
1537
avahi_address_snprint(ip, sizeof(ip), address);
1003
1538
if(debug){
1004
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1005
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1006
ip, (intmax_t)interface, port);
1539
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1540
PRIdMAX ") on port %" PRIu16 "\n", name,
1541
host_name, ip, (intmax_t)interface, port);
1007
1542
}
1008
int ret = start_mandos_communication(ip, port, interface,
1009
avahi_proto_to_af(proto));
1543
int ret = start_mandos_communication(ip, (in_port_t)port,
1544
interface,
1545
avahi_proto_to_af(proto),
1546
mc);
1010
1547
if(ret == 0){
1011
avahi_simple_poll_quit(mc.simple_poll);
1548
avahi_simple_poll_quit(simple_poll);
1012
1549
} else {
1013
ret = add_server(ip, port, interface,
1014
avahi_proto_to_af(proto));
1550
if(not add_server(ip, (in_port_t)port, interface,
1551
avahi_proto_to_af(proto),
1552
&((mandos_context*)mc)->current_server)){
1553
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1554
" list\n", name);
1555
}
1015
1556
}
1016
1557
}
1017
1558
}
1027
1568
const char *domain,
1028
1569
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1029
1570
flags,
1030
AVAHI_GCC_UNUSED void* userdata){
1031
assert(b);
1571
void *mc){
1572
if(b == NULL){
1573
return;
1574
}
1032
1575
1033
1576
/* Called whenever a new services becomes available on the LAN or
1034
1577
is removed from the LAN */
1041
1584
default:
1042
1585
case AVAHI_BROWSER_FAILURE:
1043
1586
1044
fprintf(stderr, "(Avahi browser) %s\n",
1045
avahi_strerror(avahi_server_errno(mc.server)));
1046
avahi_simple_poll_quit(mc.simple_poll);
1587
fprintf_plus(stderr, "(Avahi browser) %s\n",
1588
avahi_strerror(avahi_server_errno
1589
(((mandos_context*)mc)->server)));
1590
avahi_simple_poll_quit(simple_poll);
1047
1591
return;
1048
1592
1049
1593
case AVAHI_BROWSER_NEW:
1052
1596
the callback function is called the Avahi server will free the
1053
1597
resolver for us. */
1054
1598
1055
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1056
name, type, domain, protocol, 0,
1057
resolve_callback, NULL) == NULL)
1058
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1059
name, avahi_strerror(avahi_server_errno(mc.server)));
1599
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1600
interface, protocol, name, type,
1601
domain, protocol, 0,
1602
resolve_callback, mc) == NULL)
1603
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1604
" %s\n", name,
1605
avahi_strerror(avahi_server_errno
1606
(((mandos_context*)mc)->server)));
1060
1607
break;
1061
1608
1062
1609
case AVAHI_BROWSER_REMOVE:
1065
1612
case AVAHI_BROWSER_ALL_FOR_NOW:
1066
1613
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1067
1614
if(debug){
1068
fprintf(stderr, "No Mandos server found, still searching...\n");
1615
fprintf_plus(stderr, "No Mandos server found, still"
1616
" searching...\n");
1069
1617
}
1070
1618
break;
1071
1619
}
1080
1628
signal_received = sig;
1081
1629
int old_errno = errno;
1082
1630
/* set main loop to exit */
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1631
if(simple_poll != NULL){
1632
avahi_simple_poll_quit(simple_poll);
1085
1633
}
1086
1634
errno = old_errno;
1087
1635
}
1088
1636
1637
__attribute__((nonnull, warn_unused_result))
1089
1638
bool get_flags(const char *ifname, struct ifreq *ifr){
1090
1639
int ret;
1640
int old_errno;
1091
1641
1092
1642
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1093
1643
if(s < 0){
1644
old_errno = errno;
1094
1645
perror_plus("socket");
1646
errno = old_errno;
1095
1647
return false;
1096
1648
}
1097
strcpy(ifr->ifr_name, ifname);
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1098
1651
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1099
1652
if(ret == -1){
1100
1653
if(debug){
1654
old_errno = errno;
1101
1655
perror_plus("ioctl SIOCGIFFLAGS");
1656
errno = old_errno;
1102
1657
}
1103
1658
return false;
1104
1659
}
1105
1660
return true;
1106
1661
}
1107
1662
1663
__attribute__((nonnull, warn_unused_result))
1108
1664
bool good_flags(const char *ifname, const struct ifreq *ifr){
1109
1665
1110
1666
/* Reject the loopback device */
1111
1667
if(ifr->ifr_flags & IFF_LOOPBACK){
1112
1668
if(debug){
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1114
ifname);
1669
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1670
ifname);
1115
1671
}
1116
1672
return false;
1117
1673
}
1118
1674
/* Accept point-to-point devices only if connect_to is specified */
1119
1675
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1120
1676
if(debug){
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1122
ifname);
1677
fprintf_plus(stderr, "Accepting point-to-point interface"
1678
" \"%s\"\n", ifname);
1123
1679
}
1124
1680
return true;
1125
1681
}
1126
1682
/* Otherwise, reject non-broadcast-capable devices */
1127
1683
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1128
1684
if(debug){
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1130
ifname);
1685
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1686
" \"%s\"\n", ifname);
1131
1687
}
1132
1688
return false;
1133
1689
}
1134
1690
/* Reject non-ARP interfaces (including dummy interfaces) */
1135
1691
if(ifr->ifr_flags & IFF_NOARP){
1136
1692
if(debug){
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1693
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1694
ifname);
1138
1695
}
1139
1696
return false;
1140
1697
}
1141
1698
1142
1699
/* Accept this device */
1143
1700
if(debug){
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1701
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1145
1702
}
1146
1703
return true;
1147
1704
}
1151
1708
* corresponds to an acceptable network device.
1152
1709
* (This function is passed to scandir(3) as a filter function.)
1153
1710
*/
1711
__attribute__((nonnull, warn_unused_result))
1154
1712
int good_interface(const struct dirent *if_entry){
1155
1713
if(if_entry->d_name[0] == '.'){
1156
1714
return 0;
1159
1717
struct ifreq ifr;
1160
1718
if(not get_flags(if_entry->d_name, &ifr)){
1161
1719
if(debug){
1162
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1163
if_entry->d_name);
1164
}
1165
return 0;
1166
}
1167
1168
if(not good_flags(if_entry->d_name, &ifr)){
1169
return 0;
1170
}
1171
return 1;
1172
}
1173
1174
/*
1175
* This function determines if a directory entry in /sys/class/net
1176
* corresponds to an acceptable network device which is up.
1177
* (This function is passed to scandir(3) as a filter function.)
1178
*/
1179
int up_interface(const struct dirent *if_entry){
1180
if(if_entry->d_name[0] == '.'){
1181
return 0;
1182
}
1183
1184
struct ifreq ifr;
1185
if(not get_flags(if_entry->d_name, &ifr)){
1186
if(debug){
1187
fprintf(stderr, "Failed to get flags for interface \"%s\"\n",
1188
if_entry->d_name);
1189
}
1190
return 0;
1191
}
1192
1193
/* Reject down interfaces */
1194
if(not (ifr.ifr_flags & IFF_UP)){
1195
if(debug){
1196
fprintf(stderr, "Rejecting down interface \"%s\"\n",
1197
if_entry->d_name);
1198
}
1199
return 0;
1200
}
1201
1202
/* Reject non-running interfaces */
1203
if(not (ifr.ifr_flags & IFF_RUNNING)){
1204
if(debug){
1205
fprintf(stderr, "Rejecting non-running interface \"%s\"\n",
1206
if_entry->d_name);
1207
}
1208
return 0;
1209
}
1210
1211
if(not good_flags(if_entry->d_name, &ifr)){
1212
return 0;
1213
}
1214
return 1;
1215
}
1216
1720
fprintf_plus(stderr, "Failed to get flags for interface "
1721
"\"%s\"\n", if_entry->d_name);
1722
}
1723
return 0;
1724
}
1725
1726
if(not good_flags(if_entry->d_name, &ifr)){
1727
return 0;
1728
}
1729
return 1;
1730
}
1731
1732
/*
1733
* This function determines if a network interface is up.
1734
*/
1735
__attribute__((nonnull, warn_unused_result))
1736
bool interface_is_up(const char *interface){
1737
struct ifreq ifr;
1738
if(not get_flags(interface, &ifr)){
1739
if(debug){
1740
fprintf_plus(stderr, "Failed to get flags for interface "
1741
"\"%s\"\n", interface);
1742
}
1743
return false;
1744
}
1745
1746
return (bool)(ifr.ifr_flags & IFF_UP);
1747
}
1748
1749
/*
1750
* This function determines if a network interface is running
1751
*/
1752
__attribute__((nonnull, warn_unused_result))
1753
bool interface_is_running(const char *interface){
1754
struct ifreq ifr;
1755
if(not get_flags(interface, &ifr)){
1756
if(debug){
1757
fprintf_plus(stderr, "Failed to get flags for interface "
1758
"\"%s\"\n", interface);
1759
}
1760
return false;
1761
}
1762
1763
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1764
}
1765
1766
__attribute__((nonnull, pure, warn_unused_result))
1217
1767
int notdotentries(const struct dirent *direntry){
1218
1768
/* Skip "." and ".." */
1219
1769
if(direntry->d_name[0] == '.'
1226
1776
}
1227
1777
1228
1778
/* Is this directory entry a runnable program? */
1779
__attribute__((nonnull, warn_unused_result))
1229
1780
int runnable_hook(const struct dirent *direntry){
1230
1781
int ret;
1782
size_t sret;
1231
1783
struct stat st;
1232
1784
1233
1785
if((direntry->d_name)[0] == '\0'){
1235
1787
return 0;
1236
1788
}
1237
1789
1238
/* Save pointer to last character */
1239
char *end = strchr(direntry->d_name, '\0')-1;
1240
1241
if(*end == '~'){
1242
/* Backup name~ */
1243
return 0;
1244
}
1245
1246
if(((direntry->d_name)[0] == '#')
1247
and (*end == '#')){
1248
/* Temporary #name# */
1249
return 0;
1250
}
1251
1252
/* XXX more rules here */
1253
1254
ret = stat(direntry->d_name, &st);
1790
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1791
"abcdefghijklmnopqrstuvwxyz"
1792
"0123456789"
1793
"_.-");
1794
if((direntry->d_name)[sret] != '\0'){
1795
/* Contains non-allowed characters */
1796
if(debug){
1797
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1798
direntry->d_name);
1799
}
1800
return 0;
1801
}
1802
1803
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1255
1804
if(ret == -1){
1256
1805
if(debug){
1257
perror_plus("Could not stat plugin");
1806
perror_plus("Could not stat hook");
1258
1807
}
1259
1808
return 0;
1260
1809
}
1261
1810
if(not (S_ISREG(st.st_mode))){
1262
1811
/* Not a regular file */
1812
if(debug){
1813
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1814
direntry->d_name);
1815
}
1263
1816
return 0;
1264
1817
}
1265
1818
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1266
1819
/* Not executable */
1820
if(debug){
1821
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1822
direntry->d_name);
1823
}
1267
1824
return 0;
1268
1825
}
1826
if(debug){
1827
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1828
direntry->d_name);
1829
}
1269
1830
return 1;
1270
1831
}
1271
1832
1272
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1833
__attribute__((nonnull, warn_unused_result))
1834
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1835
mandos_context *mc){
1273
1836
int ret;
1274
1837
struct timespec now;
1275
1838
struct timespec waited_time;
1276
1839
intmax_t block_time;
1277
1840
1278
1841
while(true){
1279
if(mc.current_server == NULL){
1280
if (debug){
1281
fprintf(stderr,
1282
"Wait until first server is found. No timeout!\n");
1842
if(mc->current_server == NULL){
1843
if(debug){
1844
fprintf_plus(stderr, "Wait until first server is found."
1845
" No timeout!\n");
1283
1846
}
1284
1847
ret = avahi_simple_poll_iterate(s, -1);
1285
1848
} else {
1286
if (debug){
1287
fprintf(stderr, "Check current_server if we should run it,"
1288
" or wait\n");
1849
if(debug){
1850
fprintf_plus(stderr, "Check current_server if we should run"
1851
" it, or wait\n");
1289
1852
}
1290
1853
/* the current time */
1291
1854
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1296
1859
/* Calculating in ms how long time between now and server
1297
1860
who we visted longest time ago. Now - last seen. */
1298
1861
waited_time.tv_sec = (now.tv_sec
1299
- mc.current_server->last_seen.tv_sec);
1862
- mc->current_server->last_seen.tv_sec);
1300
1863
waited_time.tv_nsec = (now.tv_nsec
1301
- mc.current_server->last_seen.tv_nsec);
1864
- mc->current_server->last_seen.tv_nsec);
1302
1865
/* total time is 10s/10,000ms.
1303
1866
Converting to s from ms by dividing by 1,000,
1304
1867
and ns to ms by dividing by 1,000,000. */
1306
1869
- ((intmax_t)waited_time.tv_sec * 1000))
1307
1870
- ((intmax_t)waited_time.tv_nsec / 1000000));
1308
1871
1309
if (debug){
1310
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1872
if(debug){
1873
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1874
block_time);
1311
1875
}
1312
1876
1313
1877
if(block_time <= 0){
1314
ret = start_mandos_communication(mc.current_server->ip,
1315
mc.current_server->port,
1316
mc.current_server->if_index,
1317
mc.current_server->af);
1878
ret = start_mandos_communication(mc->current_server->ip,
1879
mc->current_server->port,
1880
mc->current_server->if_index,
1881
mc->current_server->af, mc);
1318
1882
if(ret == 0){
1319
avahi_simple_poll_quit(mc.simple_poll);
1883
avahi_simple_poll_quit(s);
1320
1884
return 0;
1321
1885
}
1322
1886
ret = clock_gettime(CLOCK_MONOTONIC,
1323
&mc.current_server->last_seen);
1887
&mc->current_server->last_seen);
1324
1888
if(ret == -1){
1325
1889
perror_plus("clock_gettime");
1326
1890
return -1;
1327
1891
}
1328
mc.current_server = mc.current_server->next;
1892
mc->current_server = mc->current_server->next;
1329
1893
block_time = 0; /* Call avahi to find new Mandos
1330
1894
servers, but don't block */
1331
1895
}
1333
1897
ret = avahi_simple_poll_iterate(s, (int)block_time);
1334
1898
}
1335
1899
if(ret != 0){
1336
if (ret > 0 or errno != EINTR) {
1900
if(ret > 0 or errno != EINTR){
1337
1901
return (ret != 1) ? ret : 0;
1338
1902
}
1339
1903
}
1340
1904
}
1341
1905
}
1342
1906
1907
__attribute__((nonnull))
1908
void run_network_hooks(const char *mode, const char *interface,
1909
const float delay){
1910
struct dirent **direntries = NULL;
1911
if(hookdir_fd == -1){
1912
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1913
| O_CLOEXEC);
1914
if(hookdir_fd == -1){
1915
if(errno == ENOENT){
1916
if(debug){
1917
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1918
" found\n", hookdir);
1919
}
1920
} else {
1921
perror_plus("open");
1922
}
1923
return;
1924
}
1925
}
1926
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1927
runnable_hook, alphasort);
1928
if(numhooks == -1){
1929
perror_plus("scandir");
1930
return;
1931
}
1932
struct dirent *direntry;
1933
int ret;
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1935
if(devnull == -1){
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
return;
1938
}
1939
for(int i = 0; i < numhooks; i++){
1940
direntry = direntries[i];
1941
if(debug){
1942
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1943
direntry->d_name);
1944
}
1945
pid_t hook_pid = fork();
1946
if(hook_pid == 0){
1947
/* Child */
1948
/* Raise privileges */
1949
errno = raise_privileges_permanently();
1950
if(errno != 0){
1951
perror_plus("Failed to raise privileges");
1952
_exit(EX_NOPERM);
1953
}
1954
/* Set group */
1955
errno = 0;
1956
ret = setgid(0);
1957
if(ret == -1){
1958
perror_plus("setgid");
1959
_exit(EX_NOPERM);
1960
}
1961
/* Reset supplementary groups */
1962
errno = 0;
1963
ret = setgroups(0, NULL);
1964
if(ret == -1){
1965
perror_plus("setgroups");
1966
_exit(EX_NOPERM);
1967
}
1968
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1969
if(ret == -1){
1970
perror_plus("setenv");
1971
_exit(EX_OSERR);
1972
}
1973
ret = setenv("DEVICE", interface, 1);
1974
if(ret == -1){
1975
perror_plus("setenv");
1976
_exit(EX_OSERR);
1977
}
1978
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1979
if(ret == -1){
1980
perror_plus("setenv");
1981
_exit(EX_OSERR);
1982
}
1983
ret = setenv("MODE", mode, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
char *delaystring;
1989
ret = asprintf(&delaystring, "%f", (double)delay);
1990
if(ret == -1){
1991
perror_plus("asprintf");
1992
_exit(EX_OSERR);
1993
}
1994
ret = setenv("DELAY", delaystring, 1);
1995
if(ret == -1){
1996
free(delaystring);
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
free(delaystring);
2001
if(connect_to != NULL){
2002
ret = setenv("CONNECT", connect_to, 1);
2003
if(ret == -1){
2004
perror_plus("setenv");
2005
_exit(EX_OSERR);
2006
}
2007
}
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
direntry->d_name,
2010
O_RDONLY));
2011
if(hook_fd == -1){
2012
perror_plus("openat");
2013
_exit(EXIT_FAILURE);
2014
}
2015
if(close(hookdir_fd) == -1){
2016
perror_plus("close");
2017
_exit(EXIT_FAILURE);
2018
}
2019
ret = dup2(devnull, STDIN_FILENO);
2020
if(ret == -1){
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
_exit(EX_OSERR);
2023
}
2024
ret = close(devnull);
2025
if(ret == -1){
2026
perror_plus("close");
2027
_exit(EX_OSERR);
2028
}
2029
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2030
if(ret == -1){
2031
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2032
_exit(EX_OSERR);
2033
}
2034
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2035
environ) == -1){
2036
perror_plus("fexecve");
2037
_exit(EXIT_FAILURE);
2038
}
2039
} else {
2040
if(hook_pid == -1){
2041
perror_plus("fork");
2042
free(direntry);
2043
continue;
2044
}
2045
int status;
2046
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2047
perror_plus("waitpid");
2048
free(direntry);
2049
continue;
2050
}
2051
if(WIFEXITED(status)){
2052
if(WEXITSTATUS(status) != 0){
2053
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2054
" with status %d\n", direntry->d_name,
2055
WEXITSTATUS(status));
2056
free(direntry);
2057
continue;
2058
}
2059
} else if(WIFSIGNALED(status)){
2060
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2061
" signal %d\n", direntry->d_name,
2062
WTERMSIG(status));
2063
free(direntry);
2064
continue;
2065
} else {
2066
fprintf_plus(stderr, "Warning: network hook \"%s\""
2067
" crashed\n", direntry->d_name);
2068
free(direntry);
2069
continue;
2070
}
2071
}
2072
if(debug){
2073
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2074
direntry->d_name);
2075
}
2076
free(direntry);
2077
}
2078
free(direntries);
2079
if(close(hookdir_fd) == -1){
2080
perror_plus("close");
2081
} else {
2082
hookdir_fd = -1;
2083
}
2084
close(devnull);
2085
}
2086
2087
__attribute__((nonnull, warn_unused_result))
2088
int bring_up_interface(const char *const interface,
2089
const float delay){
2090
int old_errno = errno;
2091
int ret;
2092
struct ifreq network;
2093
unsigned int if_index = if_nametoindex(interface);
2094
if(if_index == 0){
2095
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2096
errno = old_errno;
2097
return ENXIO;
2098
}
2099
2100
if(quit_now){
2101
errno = old_errno;
2102
return EINTR;
2103
}
2104
2105
if(not interface_is_up(interface)){
2106
int ret_errno = 0;
2107
int ioctl_errno = 0;
2108
if(not get_flags(interface, &network)){
2109
ret_errno = errno;
2110
fprintf_plus(stderr, "Failed to get flags for interface "
2111
"\"%s\"\n", interface);
2112
errno = old_errno;
2113
return ret_errno;
2114
}
2115
network.ifr_flags |= IFF_UP; /* set flag */
2116
2117
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2118
if(sd == -1){
2119
ret_errno = errno;
2120
perror_plus("socket");
2121
errno = old_errno;
2122
return ret_errno;
2123
}
2124
2125
if(quit_now){
2126
ret = close(sd);
2127
if(ret == -1){
2128
perror_plus("close");
2129
}
2130
errno = old_errno;
2131
return EINTR;
2132
}
2133
2134
if(debug){
2135
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2136
interface);
2137
}
2138
2139
/* Raise privileges */
2140
ret_errno = raise_privileges();
2141
if(ret_errno != 0){
2142
errno = ret_errno;
2143
perror_plus("Failed to raise privileges");
2144
}
2145
2146
#ifdef __linux__
2147
int ret_linux;
2148
bool restore_loglevel = false;
2149
if(ret_errno == 0){
2150
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2151
messages about the network interface to mess up the prompt */
2152
ret_linux = klogctl(8, NULL, 5);
2153
if(ret_linux == -1){
2154
perror_plus("klogctl");
2155
} else {
2156
restore_loglevel = true;
2157
}
2158
}
2159
#endif /* __linux__ */
2160
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2161
ioctl_errno = errno;
2162
#ifdef __linux__
2163
if(restore_loglevel){
2164
ret_linux = klogctl(7, NULL, 0);
2165
if(ret_linux == -1){
2166
perror_plus("klogctl");
2167
}
2168
}
2169
#endif /* __linux__ */
2170
2171
/* If raise_privileges() succeeded above */
2172
if(ret_errno == 0){
2173
/* Lower privileges */
2174
ret_errno = lower_privileges();
2175
if(ret_errno != 0){
2176
errno = ret_errno;
2177
perror_plus("Failed to lower privileges");
2178
}
2179
}
2180
2181
/* Close the socket */
2182
ret = close(sd);
2183
if(ret == -1){
2184
perror_plus("close");
2185
}
2186
2187
if(ret_setflags == -1){
2188
errno = ioctl_errno;
2189
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2190
errno = old_errno;
2191
return ioctl_errno;
2192
}
2193
} else if(debug){
2194
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2195
interface);
2196
}
2197
2198
/* Sleep checking until interface is running.
2199
Check every 0.25s, up to total time of delay */
2200
for(int i = 0; i < delay * 4; i++){
2201
if(interface_is_running(interface)){
2202
break;
2203
}
2204
struct timespec sleeptime = { .tv_nsec = 250000000 };
2205
ret = nanosleep(&sleeptime, NULL);
2206
if(ret == -1 and errno != EINTR){
2207
perror_plus("nanosleep");
2208
}
2209
}
2210
2211
errno = old_errno;
2212
return 0;
2213
}
2214
2215
__attribute__((nonnull, warn_unused_result))
2216
int take_down_interface(const char *const interface){
2217
int old_errno = errno;
2218
struct ifreq network;
2219
unsigned int if_index = if_nametoindex(interface);
2220
if(if_index == 0){
2221
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2222
errno = old_errno;
2223
return ENXIO;
2224
}
2225
if(interface_is_up(interface)){
2226
int ret_errno = 0;
2227
int ioctl_errno = 0;
2228
if(not get_flags(interface, &network) and debug){
2229
ret_errno = errno;
2230
fprintf_plus(stderr, "Failed to get flags for interface "
2231
"\"%s\"\n", interface);
2232
errno = old_errno;
2233
return ret_errno;
2234
}
2235
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2236
2237
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2238
if(sd == -1){
2239
ret_errno = errno;
2240
perror_plus("socket");
2241
errno = old_errno;
2242
return ret_errno;
2243
}
2244
2245
if(debug){
2246
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2247
interface);
2248
}
2249
2250
/* Raise privileges */
2251
ret_errno = raise_privileges();
2252
if(ret_errno != 0){
2253
errno = ret_errno;
2254
perror_plus("Failed to raise privileges");
2255
}
2256
2257
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2258
ioctl_errno = errno;
2259
2260
/* If raise_privileges() succeeded above */
2261
if(ret_errno == 0){
2262
/* Lower privileges */
2263
ret_errno = lower_privileges();
2264
if(ret_errno != 0){
2265
errno = ret_errno;
2266
perror_plus("Failed to lower privileges");
2267
}
2268
}
2269
2270
/* Close the socket */
2271
int ret = close(sd);
2272
if(ret == -1){
2273
perror_plus("close");
2274
}
2275
2276
if(ret_setflags == -1){
2277
errno = ioctl_errno;
2278
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2279
errno = old_errno;
2280
return ioctl_errno;
2281
}
2282
} else if(debug){
2283
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2284
interface);
2285
}
2286
2287
errno = old_errno;
2288
return 0;
2289
}
2290
1343
2291
int main(int argc, char *argv[]){
2292
mandos_context mc = { .server = NULL, .dh_bits = 0,
2293
.priority = "SECURE256:!CTYPE-X.509"
2294
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2295
.current_server = NULL, .interfaces = NULL,
2296
.interfaces_size = 0 };
1344
2297
AvahiSServiceBrowser *sb = NULL;
1345
int error;
2298
error_t ret_errno;
1346
2299
int ret;
1347
2300
intmax_t tmpmax;
1348
2301
char *tmp;
1349
2302
int exitcode = EXIT_SUCCESS;
1350
const char *interface = "";
1351
struct ifreq network;
1352
int sd = -1;
1353
bool take_down_interface = false;
1354
uid_t uid;
1355
gid_t gid;
1356
char tempdir[] = "/tmp/mandosXXXXXX";
1357
bool tempdir_created = false;
2303
char *interfaces_to_take_down = NULL;
2304
size_t interfaces_to_take_down_size = 0;
2305
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2306
char old_tempdir[] = "/tmp/mandosXXXXXX";
2307
char *tempdir = NULL;
1358
2308
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1359
2309
const char *seckey = PATHDIR "/" SECKEY;
1360
2310
const char *pubkey = PATHDIR "/" PUBKEY;
2311
const char *dh_params_file = NULL;
2312
char *interfaces_hooks = NULL;
1361
2313
1362
2314
bool gnutls_initialized = false;
1363
2315
bool gpgme_initialized = false;
1415
2367
.doc = "Bit length of the prime number used in the"
1416
2368
" Diffie-Hellman key exchange",
1417
2369
.group = 2 },
2370
{ .name = "dh-params", .key = 134,
2371
.arg = "FILE",
2372
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2373
" for the Diffie-Hellman key exchange",
2374
.group = 2 },
1418
2375
{ .name = "priority", .key = 130,
1419
2376
.arg = "STRING",
1420
2377
.doc = "GnuTLS priority string for the TLS handshake",
1425
2382
.group = 2 },
1426
2383
{ .name = "retry", .key = 132,
1427
2384
.arg = "SECONDS",
1428
.doc = "Retry interval used when denied by the mandos server",
2385
.doc = "Retry interval used when denied by the Mandos server",
2386
.group = 2 },
2387
{ .name = "network-hook-dir", .key = 133,
2388
.arg = "DIR",
2389
.doc = "Directory where network hooks are located",
1429
2390
.group = 2 },
1430
2391
/*
1431
2392
* These reproduce what we would get without ARGP_NO_HELP
1450
2411
connect_to = arg;
1451
2412
break;
1452
2413
case 'i': /* --interface */
1453
interface = arg;
2414
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2415
arg, (int)',');
2416
if(ret_errno != 0){
2417
argp_error(state, "%s", strerror(ret_errno));
2418
}
1454
2419
break;
1455
2420
case 's': /* --seckey */
1456
2421
seckey = arg;
1467
2432
}
1468
2433
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1469
2434
break;
2435
case 134: /* --dh-params */
2436
dh_params_file = arg;
2437
break;
1470
2438
case 130: /* --priority */
1471
2439
mc.priority = arg;
1472
2440
break;
1485
2453
argp_error(state, "Bad retry interval");
1486
2454
}
1487
2455
break;
2456
case 133: /* --network-hook-dir */
2457
hookdir = arg;
2458
break;
1488
2459
/*
1489
2460
* These reproduce what we would get without ARGP_NO_HELP
1490
2461
*/
1496
2467
argp_state_help(state, state->out_stream,
1497
2468
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1498
2469
case 'V': /* --version */
1499
fprintf(state->out_stream, "%s\n", argp_program_version);
2470
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1500
2471
exit(argp_err_exit_status);
1501
2472
break;
1502
2473
default:
1509
2480
.args_doc = "",
1510
2481
.doc = "Mandos client -- Get and decrypt"
1511
2482
" passwords from a Mandos server" };
1512
ret = argp_parse(&argp, argc, argv,
1513
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1514
switch(ret){
2483
ret_errno = argp_parse(&argp, argc, argv,
2484
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2485
switch(ret_errno){
1515
2486
case 0:
1516
2487
break;
1517
2488
case ENOMEM:
1518
2489
default:
1519
errno = ret;
2490
errno = ret_errno;
1520
2491
perror_plus("argp_parse");
1521
2492
exitcode = EX_OSERR;
1522
2493
goto end;
1525
2496
goto end;
1526
2497
}
1527
2498
}
1528
2499
1529
2500
{
1530
2501
/* Work around Debian bug #633582:
1531
<http://bugs.debian.org/633582> */
1532
struct stat st;
1533
1534
/* Re-raise priviliges */
1535
errno = 0;
1536
ret = seteuid(0);
1537
if(ret == -1){
1538
perror_plus("seteuid");
1539
}
1540
1541
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1542
int seckey_fd = open(seckey, O_RDONLY);
1543
if(seckey_fd == -1){
1544
perror_plus("open");
1545
} else {
1546
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1547
if(ret == -1){
1548
perror_plus("fstat");
1549
} else {
1550
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1551
ret = fchown(seckey_fd, uid, gid);
1552
if(ret == -1){
1553
perror_plus("fchown");
1554
}
1555
}
1556
}
1557
TEMP_FAILURE_RETRY(close(seckey_fd));
1558
}
1559
}
1560
1561
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1562
int pubkey_fd = open(pubkey, O_RDONLY);
1563
if(pubkey_fd == -1){
1564
perror_plus("open");
1565
} else {
1566
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1567
if(ret == -1){
1568
perror_plus("fstat");
1569
} else {
1570
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1571
ret = fchown(pubkey_fd, uid, gid);
1572
if(ret == -1){
1573
perror_plus("fchown");
1574
}
1575
}
1576
}
1577
TEMP_FAILURE_RETRY(close(pubkey_fd));
1578
}
1579
}
1580
1581
/* Lower privileges */
1582
errno = 0;
1583
ret = seteuid(uid);
1584
if(ret == -1){
1585
perror_plus("seteuid");
1586
}
1587
}
1588
1589
/* Find network hooks and run them */
1590
{
1591
struct dirent **direntries;
1592
struct dirent *direntry;
1593
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1594
alphasort);
1595
int devnull = open("/dev/null", O_RDONLY);
1596
for(int i = 0; i < numhooks; i++){
1597
direntry = direntries[0];
1598
char *fullname = NULL;
1599
ret = asprintf(&fullname, "%s/%s", tempdir,
1600
direntry->d_name);
1601
if(ret < 0){
1602
perror_plus("asprintf");
1603
continue;
1604
}
1605
pid_t hook_pid = fork();
1606
if(hook_pid == 0){
1607
/* Child */
1608
dup2(devnull, STDIN_FILENO);
1609
close(devnull);
1610
dup2(STDERR_FILENO, STDOUT_FILENO);
1611
ret = setenv("DEVICE", interface, 1);
1612
if(ret == -1){
1613
perror_plus("setenv");
1614
exit(1);
1615
}
1616
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1617
if(ret == -1){
1618
perror_plus("setenv");
1619
exit(1);
1620
}
1621
ret = setenv("MODE", "start", 1);
1622
if(ret == -1){
1623
perror_plus("setenv");
1624
exit(1);
1625
}
1626
char *delaystring;
1627
ret = asprintf(&delaystring, "%f", delay);
1628
if(ret == -1){
1629
perror_plus("asprintf");
1630
exit(1);
1631
}
1632
ret = setenv("DELAY", delaystring, 1);
1633
if(ret == -1){
1634
free(delaystring);
1635
perror_plus("setenv");
1636
exit(1);
1637
}
1638
free(delaystring);
1639
ret = execl(fullname, direntry->d_name, "start", NULL);
1640
perror_plus("execl");
1641
}
1642
free(fullname);
1643
if(quit_now){
2502
<https://bugs.debian.org/633582> */
2503
2504
/* Re-raise privileges */
2505
ret = raise_privileges();
2506
if(ret != 0){
2507
errno = ret;
2508
perror_plus("Failed to raise privileges");
2509
} else {
2510
struct stat st;
2511
2512
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2513
int seckey_fd = open(seckey, O_RDONLY);
2514
if(seckey_fd == -1){
2515
perror_plus("open");
2516
} else {
2517
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2518
if(ret == -1){
2519
perror_plus("fstat");
2520
} else {
2521
if(S_ISREG(st.st_mode)
2522
and st.st_uid == 0 and st.st_gid == 0){
2523
ret = fchown(seckey_fd, uid, gid);
2524
if(ret == -1){
2525
perror_plus("fchown");
2526
}
2527
}
2528
}
2529
close(seckey_fd);
2530
}
2531
}
2532
2533
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2534
int pubkey_fd = open(pubkey, O_RDONLY);
2535
if(pubkey_fd == -1){
2536
perror_plus("open");
2537
} else {
2538
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2539
if(ret == -1){
2540
perror_plus("fstat");
2541
} else {
2542
if(S_ISREG(st.st_mode)
2543
and st.st_uid == 0 and st.st_gid == 0){
2544
ret = fchown(pubkey_fd, uid, gid);
2545
if(ret == -1){
2546
perror_plus("fchown");
2547
}
2548
}
2549
}
2550
close(pubkey_fd);
2551
}
2552
}
2553
2554
if(dh_params_file != NULL
2555
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2556
int dhparams_fd = open(dh_params_file, O_RDONLY);
2557
if(dhparams_fd == -1){
2558
perror_plus("open");
2559
} else {
2560
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2561
if(ret == -1){
2562
perror_plus("fstat");
2563
} else {
2564
if(S_ISREG(st.st_mode)
2565
and st.st_uid == 0 and st.st_gid == 0){
2566
ret = fchown(dhparams_fd, uid, gid);
2567
if(ret == -1){
2568
perror_plus("fchown");
2569
}
2570
}
2571
}
2572
close(dhparams_fd);
2573
}
2574
}
2575
2576
/* Lower privileges */
2577
ret = lower_privileges();
2578
if(ret != 0){
2579
errno = ret;
2580
perror_plus("Failed to lower privileges");
2581
}
2582
}
2583
}
2584
2585
/* Remove invalid interface names (except "none") */
2586
{
2587
char *interface = NULL;
2588
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2589
interface))){
2590
if(strcmp(interface, "none") != 0
2591
and if_nametoindex(interface) == 0){
2592
if(interface[0] != '\0'){
2593
fprintf_plus(stderr, "Not using nonexisting interface"
2594
" \"%s\"\n", interface);
2595
}
2596
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2597
interface = NULL;
2598
}
2599
}
2600
}
2601
2602
/* Run network hooks */
2603
{
2604
if(mc.interfaces != NULL){
2605
interfaces_hooks = malloc(mc.interfaces_size);
2606
if(interfaces_hooks == NULL){
2607
perror_plus("malloc");
1644
2608
goto end;
1645
2609
}
2610
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2611
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
1646
2612
}
1647
close(devnull);
2613
run_network_hooks("start", interfaces_hooks != NULL ?
2614
interfaces_hooks : "", delay);
1648
2615
}
1649
2616
1650
2617
if(not debug){
1651
2618
avahi_set_log_function(empty_log);
1652
2619
}
1653
2620
1654
if(interface[0] == '\0'){
1655
struct dirent **direntries;
1656
/* First look for interfaces that are up */
1657
ret = scandir(sys_class_net, &direntries, up_interface,
1658
alphasort);
1659
if(ret == 0){
1660
/* No up interfaces, look for any good interfaces */
1661
free(direntries);
1662
ret = scandir(sys_class_net, &direntries, good_interface,
1663
alphasort);
1664
}
1665
if(ret >= 1){
1666
/* Pick the first interface returned */
1667
interface = strdup(direntries[0]->d_name);
1668
if(debug){
1669
fprintf(stderr, "Using interface \"%s\"\n", interface);
1670
}
1671
if(interface == NULL){
1672
perror_plus("malloc");
1673
free(direntries);
1674
exitcode = EXIT_FAILURE;
1675
goto end;
1676
}
1677
free(direntries);
1678
} else {
1679
free(direntries);
1680
fprintf(stderr, "Could not find a network interface\n");
1681
exitcode = EXIT_FAILURE;
1682
goto end;
1683
}
1684
}
1685
1686
2621
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1687
2622
from the signal handler */
1688
2623
/* Initialize the pseudo-RNG for Avahi */
1689
2624
srand((unsigned int) time(NULL));
1690
mc.simple_poll = avahi_simple_poll_new();
1691
if(mc.simple_poll == NULL){
1692
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2625
simple_poll = avahi_simple_poll_new();
2626
if(simple_poll == NULL){
2627
fprintf_plus(stderr,
2628
"Avahi: Failed to create simple poll object.\n");
1693
2629
exitcode = EX_UNAVAILABLE;
1694
2630
goto end;
1695
2631
}
1757
2693
}
1758
2694
}
1759
2695
1760
/* If the interface is down, bring it up */
1761
if(strcmp(interface, "none") != 0){
1762
if_index = (AvahiIfIndex) if_nametoindex(interface);
1763
if(if_index == 0){
1764
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1765
exitcode = EX_UNAVAILABLE;
1766
goto end;
1767
}
1768
1769
if(quit_now){
1770
goto end;
1771
}
1772
1773
/* Re-raise priviliges */
1774
errno = 0;
1775
ret = seteuid(0);
1776
if(ret == -1){
1777
perror_plus("seteuid");
1778
}
1779
1780
#ifdef __linux__
1781
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1782
messages about the network interface to mess up the prompt */
1783
ret = klogctl(8, NULL, 5);
1784
bool restore_loglevel = true;
1785
if(ret == -1){
1786
restore_loglevel = false;
1787
perror_plus("klogctl");
1788
}
1789
#endif /* __linux__ */
1790
1791
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1792
if(sd < 0){
1793
perror_plus("socket");
1794
exitcode = EX_OSERR;
1795
#ifdef __linux__
1796
if(restore_loglevel){
1797
ret = klogctl(7, NULL, 0);
1798
if(ret == -1){
1799
perror_plus("klogctl");
1800
}
1801
}
1802
#endif /* __linux__ */
1803
/* Lower privileges */
1804
errno = 0;
1805
ret = seteuid(uid);
1806
if(ret == -1){
1807
perror_plus("seteuid");
1808
}
1809
goto end;
1810
}
1811
strcpy(network.ifr_name, interface);
1812
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1813
if(ret == -1){
1814
perror_plus("ioctl SIOCGIFFLAGS");
1815
#ifdef __linux__
1816
if(restore_loglevel){
1817
ret = klogctl(7, NULL, 0);
1818
if(ret == -1){
1819
perror_plus("klogctl");
1820
}
1821
}
1822
#endif /* __linux__ */
1823
exitcode = EX_OSERR;
1824
/* Lower privileges */
1825
errno = 0;
1826
ret = seteuid(uid);
1827
if(ret == -1){
1828
perror_plus("seteuid");
1829
}
1830
goto end;
1831
}
1832
if((network.ifr_flags & IFF_UP) == 0){
1833
network.ifr_flags |= IFF_UP;
1834
take_down_interface = true;
1835
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1836
if(ret == -1){
1837
take_down_interface = false;
1838
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1839
exitcode = EX_OSERR;
1840
#ifdef __linux__
1841
if(restore_loglevel){
1842
ret = klogctl(7, NULL, 0);
1843
if(ret == -1){
1844
perror_plus("klogctl");
2696
/* If no interfaces were specified, make a list */
2697
if(mc.interfaces == NULL){
2698
struct dirent **direntries = NULL;
2699
/* Look for any good interfaces */
2700
ret = scandir(sys_class_net, &direntries, good_interface,
2701
alphasort);
2702
if(ret >= 1){
2703
/* Add all found interfaces to interfaces list */
2704
for(int i = 0; i < ret; ++i){
2705
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2706
direntries[i]->d_name);
2707
if(ret_errno != 0){
2708
errno = ret_errno;
2709
perror_plus("argz_add");
2710
free(direntries[i]);
2711
continue;
2712
}
2713
if(debug){
2714
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2715
direntries[i]->d_name);
2716
}
2717
free(direntries[i]);
2718
}
2719
free(direntries);
2720
} else {
2721
if(ret == 0){
2722
free(direntries);
2723
}
2724
fprintf_plus(stderr, "Could not find a network interface\n");
2725
exitcode = EXIT_FAILURE;
2726
goto end;
2727
}
2728
}
2729
2730
/* Bring up interfaces which are down, and remove any "none"s */
2731
{
2732
char *interface = NULL;
2733
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2734
interface))){
2735
/* If interface name is "none", stop bringing up interfaces.
2736
Also remove all instances of "none" from the list */
2737
if(strcmp(interface, "none") == 0){
2738
argz_delete(&mc.interfaces, &mc.interfaces_size,
2739
interface);
2740
interface = NULL;
2741
while((interface = argz_next(mc.interfaces,
2742
mc.interfaces_size, interface))){
2743
if(strcmp(interface, "none") == 0){
2744
argz_delete(&mc.interfaces, &mc.interfaces_size,
2745
interface);
2746
interface = NULL;
1845
2747
}
1846
2748
}
1847
#endif /* __linux__ */
1848
/* Lower privileges */
1849
errno = 0;
1850
ret = seteuid(uid);
1851
if(ret == -1){
1852
perror_plus("seteuid");
1853
}
1854
goto end;
1855
}
1856
}
1857
/* Sleep checking until interface is running.
1858
Check every 0.25s, up to total time of delay */
1859
for(int i=0; i < delay * 4; i++){
1860
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1861
if(ret == -1){
1862
perror_plus("ioctl SIOCGIFFLAGS");
1863
} else if(network.ifr_flags & IFF_RUNNING){
1864
2749
break;
1865
2750
}
1866
struct timespec sleeptime = { .tv_nsec = 250000000 };
1867
ret = nanosleep(&sleeptime, NULL);
1868
if(ret == -1 and errno != EINTR){
1869
perror_plus("nanosleep");
1870
}
1871
}
1872
if(not take_down_interface){
1873
/* We won't need the socket anymore */
1874
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1875
if(ret == -1){
1876
perror_plus("close");
1877
}
1878
}
1879
#ifdef __linux__
1880
if(restore_loglevel){
1881
/* Restores kernel loglevel to default */
1882
ret = klogctl(7, NULL, 0);
1883
if(ret == -1){
1884
perror_plus("klogctl");
1885
}
1886
}
1887
#endif /* __linux__ */
1888
/* Lower privileges */
1889
errno = 0;
1890
if(take_down_interface){
1891
/* Lower privileges */
1892
ret = seteuid(uid);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
} else {
1897
/* Lower privileges permanently */
1898
ret = setuid(uid);
1899
if(ret == -1){
1900
perror_plus("setuid");
1901
}
1902
}
2751
bool interface_was_up = interface_is_up(interface);
2752
errno = bring_up_interface(interface, delay);
2753
if(not interface_was_up){
2754
if(errno != 0){
2755
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2756
" %s\n", interface, strerror(errno));
2757
} else {
2758
errno = argz_add(&interfaces_to_take_down,
2759
&interfaces_to_take_down_size,
2760
interface);
2761
if(errno != 0){
2762
perror_plus("argz_add");
2763
}
2764
}
2765
}
2766
}
2767
if(debug and (interfaces_to_take_down == NULL)){
2768
fprintf_plus(stderr, "No interfaces were brought up\n");
2769
}
2770
}
2771
2772
/* If we only got one interface, explicitly use only that one */
2773
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2774
if(debug){
2775
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2776
mc.interfaces);
2777
}
2778
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1903
2779
}
1904
2780
1905
2781
if(quit_now){
1906
2782
goto end;
1907
2783
}
1908
2784
1909
ret = init_gnutls_global(pubkey, seckey);
2785
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1910
2786
if(ret == -1){
1911
fprintf(stderr, "init_gnutls_global failed\n");
2787
fprintf_plus(stderr, "init_gnutls_global failed\n");
1912
2788
exitcode = EX_UNAVAILABLE;
1913
2789
goto end;
1914
2790
} else {
1919
2795
goto end;
1920
2796
}
1921
2797
1922
if(mkdtemp(tempdir) == NULL){
2798
/* Try /run/tmp before /tmp */
2799
tempdir = mkdtemp(run_tempdir);
2800
if(tempdir == NULL and errno == ENOENT){
2801
if(debug){
2802
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2803
run_tempdir, old_tempdir);
2804
}
2805
tempdir = mkdtemp(old_tempdir);
2806
}
2807
if(tempdir == NULL){
1923
2808
perror_plus("mkdtemp");
1924
2809
goto end;
1925
2810
}
1926
tempdir_created = true;
1927
2811
1928
2812
if(quit_now){
1929
2813
goto end;
1930
2814
}
1931
2815
1932
if(not init_gpgme(pubkey, seckey, tempdir)){
1933
fprintf(stderr, "init_gpgme failed\n");
2816
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2817
fprintf_plus(stderr, "init_gpgme failed\n");
1934
2818
exitcode = EX_UNAVAILABLE;
1935
2819
goto end;
1936
2820
} else {
1945
2829
/* Connect directly, do not use Zeroconf */
1946
2830
/* (Mainly meant for debugging) */
1947
2831
char *address = strrchr(connect_to, ':');
2832
1948
2833
if(address == NULL){
1949
fprintf(stderr, "No colon in address\n");
2834
fprintf_plus(stderr, "No colon in address\n");
1950
2835
exitcode = EX_USAGE;
1951
2836
goto end;
1952
2837
}
1955
2840
goto end;
1956
2841
}
1957
2842
1958
uint16_t port;
2843
in_port_t port;
1959
2844
errno = 0;
1960
2845
tmpmax = strtoimax(address+1, &tmp, 10);
1961
2846
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1962
or tmpmax != (uint16_t)tmpmax){
1963
fprintf(stderr, "Bad port number\n");
2847
or tmpmax != (in_port_t)tmpmax){
2848
fprintf_plus(stderr, "Bad port number\n");
1964
2849
exitcode = EX_USAGE;
1965
2850
goto end;
1966
2851
}
1967
2852
1968
2853
if(quit_now){
1969
2854
goto end;
1970
2855
}
1971
2856
1972
port = (uint16_t)tmpmax;
2857
port = (in_port_t)tmpmax;
1973
2858
*address = '\0';
1974
2859
/* Colon in address indicates IPv6 */
1975
2860
int af;
1991
2876
}
1992
2877
1993
2878
while(not quit_now){
1994
ret = start_mandos_communication(address, port, if_index, af);
2879
ret = start_mandos_communication(address, port, if_index, af,
2880
&mc);
1995
2881
if(quit_now or ret == 0){
1996
2882
break;
1997
2883
}
1998
2884
if(debug){
1999
fprintf(stderr, "Retrying in %d seconds\n",
2000
(int)retry_interval);
2885
fprintf_plus(stderr, "Retrying in %d seconds\n",
2886
(int)retry_interval);
2001
2887
}
2002
sleep((int)retry_interval);
2888
sleep((unsigned int)retry_interval);
2003
2889
}
2004
2890
2005
if (not quit_now){
2891
if(not quit_now){
2006
2892
exitcode = EXIT_SUCCESS;
2007
2893
}
2008
2894
2023
2909
config.publish_domain = 0;
2024
2910
2025
2911
/* Allocate a new server */
2026
mc.server = avahi_server_new(avahi_simple_poll_get
2027
(mc.simple_poll), &config, NULL,
2028
NULL, &error);
2912
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2913
&config, NULL, NULL, &ret);
2029
2914
2030
2915
/* Free the Avahi configuration data */
2031
2916
avahi_server_config_free(&config);
2033
2918
2034
2919
/* Check if creating the Avahi server object succeeded */
2035
2920
if(mc.server == NULL){
2036
fprintf(stderr, "Failed to create Avahi server: %s\n",
2037
avahi_strerror(error));
2921
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2922
avahi_strerror(ret));
2038
2923
exitcode = EX_UNAVAILABLE;
2039
2924
goto end;
2040
2925
}
2046
2931
/* Create the Avahi service browser */
2047
2932
sb = avahi_s_service_browser_new(mc.server, if_index,
2048
2933
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2049
NULL, 0, browse_callback, NULL);
2934
NULL, 0, browse_callback,
2935
(void *)&mc);
2050
2936
if(sb == NULL){
2051
fprintf(stderr, "Failed to create service browser: %s\n",
2052
avahi_strerror(avahi_server_errno(mc.server)));
2937
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2938
avahi_strerror(avahi_server_errno(mc.server)));
2053
2939
exitcode = EX_UNAVAILABLE;
2054
2940
goto end;
2055
2941
}
2061
2947
/* Run the main loop */
2062
2948
2063
2949
if(debug){
2064
fprintf(stderr, "Starting Avahi loop search\n");
2950
fprintf_plus(stderr, "Starting Avahi loop search\n");
2065
2951
}
2066
2067
ret = avahi_loop_with_timeout(mc.simple_poll,
2068
(int)(retry_interval * 1000));
2952
2953
ret = avahi_loop_with_timeout(simple_poll,
2954
(int)(retry_interval * 1000), &mc);
2069
2955
if(debug){
2070
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2071
(ret == 0) ? "successfully" : "with error");
2956
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2957
(ret == 0) ? "successfully" : "with error");
2072
2958
}
2073
2959
2074
2960
end:
2075
2961
2076
2962
if(debug){
2077
fprintf(stderr, "%s exiting\n", argv[0]);
2963
if(signal_received){
2964
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2965
argv[0], signal_received,
2966
strsignal(signal_received));
2967
} else {
2968
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2969
}
2078
2970
}
2079
2971
2080
2972
/* Cleanup things */
2973
free(mc.interfaces);
2974
2081
2975
if(sb != NULL)
2082
2976
avahi_s_service_browser_free(sb);
2083
2977
2084
2978
if(mc.server != NULL)
2085
2979
avahi_server_free(mc.server);
2086
2980
2087
if(mc.simple_poll != NULL)
2088
avahi_simple_poll_free(mc.simple_poll);
2981
if(simple_poll != NULL)
2982
avahi_simple_poll_free(simple_poll);
2089
2983
2090
2984
if(gnutls_initialized){
2091
2985
gnutls_certificate_free_credentials(mc.cred);
2092
gnutls_global_deinit();
2093
2986
gnutls_dh_params_deinit(mc.dh_params);
2094
2987
}
2095
2988
2096
2989
if(gpgme_initialized){
2097
2990
gpgme_release(mc.ctx);
2098
2991
}
2099
2992
2100
2993
/* Cleans up the circular linked list of Mandos servers the client
2101
2994
has seen */
2102
2995
if(mc.current_server != NULL){
2103
2996
mc.current_server->prev->next = NULL;
2104
2997
while(mc.current_server != NULL){
2105
2998
server *next = mc.current_server->next;
2999
#ifdef __GNUC__
3000
#pragma GCC diagnostic push
3001
#pragma GCC diagnostic ignored "-Wcast-qual"
3002
#endif
3003
free((char *)(mc.current_server->ip));
3004
#ifdef __GNUC__
3005
#pragma GCC diagnostic pop
3006
#endif
2106
3007
free(mc.current_server);
2107
3008
mc.current_server = next;
2108
3009
}
2109
3010
}
2110
3011
2111
/* XXX run network hooks "stop" here */
2112
2113
/* Take down the network interface */
2114
if(take_down_interface){
2115
/* Re-raise priviliges */
2116
errno = 0;
2117
ret = seteuid(0);
2118
if(ret == -1){
2119
perror_plus("seteuid");
2120
}
2121
if(geteuid() == 0){
2122
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2123
if(ret == -1){
2124
perror_plus("ioctl SIOCGIFFLAGS");
2125
} else if(network.ifr_flags & IFF_UP) {
2126
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2127
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2128
if(ret == -1){
2129
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2130
}
2131
}
2132
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2133
if(ret == -1){
2134
perror_plus("close");
2135
}
2136
/* Lower privileges permanently */
2137
errno = 0;
2138
ret = setuid(uid);
2139
if(ret == -1){
2140
perror_plus("setuid");
2141
}
2142
}
3012
/* Re-raise privileges */
3013
{
3014
ret = raise_privileges();
3015
if(ret != 0){
3016
errno = ret;
3017
perror_plus("Failed to raise privileges");
3018
} else {
3019
3020
/* Run network hooks */
3021
run_network_hooks("stop", interfaces_hooks != NULL ?
3022
interfaces_hooks : "", delay);
3023
3024
/* Take down the network interfaces which were brought up */
3025
{
3026
char *interface = NULL;
3027
while((interface = argz_next(interfaces_to_take_down,
3028
interfaces_to_take_down_size,
3029
interface))){
3030
ret = take_down_interface(interface);
3031
if(ret != 0){
3032
errno = ret;
3033
perror_plus("Failed to take down interface");
3034
}
3035
}
3036
if(debug and (interfaces_to_take_down == NULL)){
3037
fprintf_plus(stderr, "No interfaces needed to be taken"
3038
" down\n");
3039
}
3040
}
3041
}
3042
3043
ret = lower_privileges_permanently();
3044
if(ret != 0){
3045
errno = ret;
3046
perror_plus("Failed to lower privileges permanently");
3047
}
3048
}
3049
3050
free(interfaces_to_take_down);
3051
free(interfaces_hooks);
3052
3053
void clean_dir_at(int base, const char * const dirname,
3054
uintmax_t level){
3055
struct dirent **direntries = NULL;
3056
int dret;
3057
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3058
O_RDONLY
3059
| O_NOFOLLOW
3060
| O_DIRECTORY
3061
| O_PATH));
3062
if(dir_fd == -1){
3063
perror_plus("open");
3064
}
3065
int numentries = scandirat(dir_fd, ".", &direntries,
3066
notdotentries, alphasort);
3067
if(numentries >= 0){
3068
for(int i = 0; i < numentries; i++){
3069
if(debug){
3070
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3071
dirname, direntries[i]->d_name);
3072
}
3073
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3074
if(dret == -1){
3075
if(errno == EISDIR){
3076
dret = unlinkat(dir_fd, direntries[i]->d_name,
3077
AT_REMOVEDIR);
3078
}
3079
if((dret == -1) and (errno == ENOTEMPTY)
3080
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3081
== 0) and (level == 0)){
3082
/* Recurse only in this special case */
3083
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3084
dret = 0;
3085
}
3086
if(dret == -1){
3087
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3088
direntries[i]->d_name, strerror(errno));
3089
}
3090
}
3091
free(direntries[i]);
3092
}
3093
3094
/* need to clean even if 0 because man page doesn't specify */
3095
free(direntries);
3096
if(numentries == -1){
3097
perror_plus("scandirat");
3098
}
3099
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3100
if(dret == -1 and errno != ENOENT){
3101
perror_plus("rmdir");
3102
}
3103
} else {
3104
perror_plus("scandirat");
3105
}
3106
close(dir_fd);
2143
3107
}
2144
3108
2145
3109
/* Removes the GPGME temp directory and all files inside */
2146
if(tempdir_created){
2147
struct dirent **direntries = NULL;
2148
struct dirent *direntry = NULL;
2149
int numentries = scandir(tempdir, &direntries, notdotentries,
2150
alphasort);
2151
if (numentries > 0){
2152
for(int i = 0; i < numentries; i++){
2153
direntry = direntries[i];
2154
char *fullname = NULL;
2155
ret = asprintf(&fullname, "%s/%s", tempdir,
2156
direntry->d_name);
2157
if(ret < 0){
2158
perror_plus("asprintf");
2159
continue;
2160
}
2161
ret = remove(fullname);
2162
if(ret == -1){
2163
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2164
strerror(errno));
2165
}
2166
free(fullname);
2167
}
2168
}
2169
2170
/* need to clean even if 0 because man page doesn't specify */
2171
free(direntries);
2172
if (numentries == -1){
2173
perror_plus("scandir");
2174
}
2175
ret = rmdir(tempdir);
2176
if(ret == -1 and errno != ENOENT){
2177
perror_plus("rmdir");
2178
}
3110
if(tempdir != NULL){
3111
clean_dir_at(-1, tempdir, 0);
2179
3112
}
2180
3113
2181
3114
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0