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- Committer: Teddy Hogeborn
- Date: 2011-07-13 01:11:12 UTC
- Revision ID: teddy@fukt.bsnet.se-20110713011112-bgf3tenqq60uoyyb
* Makefile (plugins.d/mandos-client): Bug fix: Put $^ before all
libraries. Remove "$(COMMON)".
Thanks to Angel Abad
<angelabad@ubuntu.com>.
* initramfs-tools-script: Work around change in initramfs-tools,
Debian bug #633582.
* plugins.d/mandos-client.c (init_gnutls_global): Bug fix: check for
errors from gnutls_certificate_allocate_credentials().
libraries. Remove "$(COMMON)".
Thanks to Angel Abad
<angelabad@ubuntu.com>.
* initramfs-tools-script: Work around change in initramfs-tools,
Debian bug #633582.
* plugins.d/mandos-client.c (init_gnutls_global): Bug fix: check for
errors from gnutls_certificate_allocate_credentials().
- files removed:
- 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 © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
65
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
66
EAI_SYSTEM, ENETUNREACH,
67
EHOSTUNREACH, ECONNREFUSED, EPROTO,
68
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
69
ENOTEMPTY,
70
program_invocation_short_name */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
71
66
#include <time.h> /* nanosleep(), time(), sleep() */
72
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
68
SIOCSIFFLAGS, if_indextoname(),
77
72
*/
78
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
79
74
getuid(), getgid(), seteuid(),
80
setgid(), pause(), _exit(),
81
unlinkat() */
82
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
83
77
#include <iso646.h> /* not, or, and */
84
78
#include <argp.h> /* struct argp_option, error_t, struct
85
79
argp_state, struct argp,
90
84
raise() */
91
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
92
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
93
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
94
WEXITSTATUS(), WTERMSIG() */
95
#include <grp.h> /* setgroups() */
96
#include <argz.h> /* argz_add_sep(), argz_next(),
97
argz_delete(), argz_append(),
98
argz_stringify(), argz_add(),
99
argz_count() */
100
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
101
EAI_SYSTEM, gai_strerror() */
102
87
103
88
#ifdef __linux__
104
89
#include <sys/klog.h> /* klogctl() */
122
107
init_gnutls_session(),
123
108
GNUTLS_* */
124
109
#include <gnutls/openpgp.h>
125
/* gnutls_certificate_set_openpgp_key_file(),
126
GNUTLS_OPENPGP_FMT_BASE64 */
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
127
112
128
113
/* GPGME */
129
114
#include <gpgme.h> /* All GPGME types, constants and
137
122
#define PATHDIR "/conf/conf.d/mandos"
138
123
#define SECKEY "seckey.txt"
139
124
#define PUBKEY "pubkey.txt"
140
#define HOOKDIR "/lib/mandos/network-hooks.d"
141
125
142
126
bool debug = false;
143
127
static const char mandos_protocol_version[] = "1";
144
128
const char *argp_program_version = "mandos-client " VERSION;
145
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
146
130
static const char sys_class_net[] = "/sys/class/net";
147
131
char *connect_to = NULL;
148
const char *hookdir = HOOKDIR;
149
int hookdir_fd = -1;
150
uid_t uid = 65534;
151
gid_t gid = 65534;
152
153
/* Doubly linked list that need to be circularly linked when used */
154
typedef struct server{
155
const char *ip;
156
in_port_t port;
157
AvahiIfIndex if_index;
158
int af;
159
struct timespec last_seen;
160
struct server *next;
161
struct server *prev;
162
} server;
163
132
164
133
/* Used for passing in values through the Avahi callback functions */
165
134
typedef struct {
135
AvahiSimplePoll *simple_poll;
166
136
AvahiServer *server;
167
137
gnutls_certificate_credentials_t cred;
168
138
unsigned int dh_bits;
169
139
gnutls_dh_params_t dh_params;
170
140
const char *priority;
171
141
gpgme_ctx_t ctx;
172
server *current_server;
173
char *interfaces;
174
size_t interfaces_size;
175
142
} mandos_context;
176
143
177
/* global so signal handler can reach it*/
178
AvahiSimplePoll *simple_poll;
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
179
148
180
149
sig_atomic_t quit_now = 0;
181
150
int signal_received = 0;
182
151
183
/* Function to use when printing errors */
184
void perror_plus(const char *print_text){
185
int e = errno;
186
fprintf(stderr, "Mandos plugin %s: ",
187
program_invocation_short_name);
188
errno = e;
189
perror(print_text);
190
}
191
192
__attribute__((format (gnu_printf, 2, 3), nonnull))
193
int fprintf_plus(FILE *stream, const char *format, ...){
194
va_list ap;
195
va_start (ap, format);
196
197
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
198
program_invocation_short_name));
199
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
200
}
201
202
152
/*
203
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
204
154
* bytes. "buffer_capacity" is how much is currently allocated,
205
155
* "buffer_length" is how much is already used.
206
156
*/
207
__attribute__((nonnull, warn_unused_result))
208
157
size_t incbuffer(char **buffer, size_t buffer_length,
209
size_t buffer_capacity){
158
size_t buffer_capacity){
210
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
211
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
212
if(new_buf == NULL){
213
int old_errno = errno;
214
free(*buffer);
215
errno = old_errno;
216
*buffer = NULL;
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
161
if(buffer == NULL){
217
162
return 0;
218
163
}
219
*buffer = new_buf;
220
164
buffer_capacity += BUFFER_SIZE;
221
165
}
222
166
return buffer_capacity;
223
167
}
224
168
225
/* Add server to set of servers to retry periodically */
226
__attribute__((nonnull, warn_unused_result))
227
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
228
int af, server **current_server){
229
int ret;
230
server *new_server = malloc(sizeof(server));
231
if(new_server == NULL){
232
perror_plus("malloc");
233
return false;
234
}
235
*new_server = (server){ .ip = strdup(ip),
236
.port = port,
237
.if_index = if_index,
238
.af = af };
239
if(new_server->ip == NULL){
240
perror_plus("strdup");
241
free(new_server);
242
return false;
243
}
244
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
245
if(ret == -1){
246
perror_plus("clock_gettime");
247
#ifdef __GNUC__
248
#pragma GCC diagnostic push
249
#pragma GCC diagnostic ignored "-Wcast-qual"
250
#endif
251
free((char *)(new_server->ip));
252
#ifdef __GNUC__
253
#pragma GCC diagnostic pop
254
#endif
255
free(new_server);
256
return false;
257
}
258
/* Special case of first server */
259
if(*current_server == NULL){
260
new_server->next = new_server;
261
new_server->prev = new_server;
262
*current_server = new_server;
263
} else {
264
/* Place the new server last in the list */
265
new_server->next = *current_server;
266
new_server->prev = (*current_server)->prev;
267
new_server->prev->next = new_server;
268
(*current_server)->prev = new_server;
269
}
270
return true;
271
}
272
273
169
/*
274
170
* Initialize GPGME.
275
171
*/
276
__attribute__((nonnull, warn_unused_result))
277
static bool init_gpgme(const char * const seckey,
278
const char * const pubkey,
279
const char * const tempdir,
280
mandos_context *mc){
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
281
174
gpgme_error_t rc;
282
175
gpgme_engine_info_t engine_info;
283
176
177
284
178
/*
285
179
* Helper function to insert pub and seckey to the engine keyring.
286
180
*/
287
bool import_key(const char * const filename){
181
bool import_key(const char *filename){
288
182
int ret;
289
183
int fd;
290
184
gpgme_data_t pgp_data;
291
185
292
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
293
187
if(fd == -1){
294
perror_plus("open");
188
perror("open");
295
189
return false;
296
190
}
297
191
298
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
299
193
if(rc != GPG_ERR_NO_ERROR){
300
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
301
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
302
196
return false;
303
197
}
304
198
305
rc = gpgme_op_import(mc->ctx, pgp_data);
199
rc = gpgme_op_import(mc.ctx, pgp_data);
306
200
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
309
203
return false;
310
204
}
311
205
312
ret = close(fd);
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
313
207
if(ret == -1){
314
perror_plus("close");
208
perror("close");
315
209
}
316
210
gpgme_data_release(pgp_data);
317
211
return true;
318
212
}
319
213
320
214
if(debug){
321
fprintf_plus(stderr, "Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
322
216
}
323
217
324
218
/* Init GPGME */
325
219
gpgme_check_version(NULL);
326
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
327
221
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
329
gpgme_strsource(rc), gpgme_strerror(rc));
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
330
224
return false;
331
225
}
332
226
333
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
334
228
rc = gpgme_get_engine_info(&engine_info);
335
229
if(rc != GPG_ERR_NO_ERROR){
336
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
337
gpgme_strsource(rc), gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
338
232
return false;
339
233
}
340
234
while(engine_info != NULL){
346
240
engine_info = engine_info->next;
347
241
}
348
242
if(engine_info == NULL){
349
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
350
tempdir);
243
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
351
244
return false;
352
245
}
353
246
354
247
/* Create new GPGME "context" */
355
rc = gpgme_new(&(mc->ctx));
248
rc = gpgme_new(&(mc.ctx));
356
249
if(rc != GPG_ERR_NO_ERROR){
357
fprintf_plus(stderr, "Mandos plugin mandos-client: "
358
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
359
gpgme_strerror(rc));
250
fprintf(stderr, "bad gpgme_new: %s: %s\n",
251
gpgme_strsource(rc), gpgme_strerror(rc));
360
252
return false;
361
253
}
362
254
371
263
* Decrypt OpenPGP data.
372
264
* Returns -1 on error
373
265
*/
374
__attribute__((nonnull, warn_unused_result))
375
266
static ssize_t pgp_packet_decrypt(const char *cryptotext,
376
267
size_t crypto_size,
377
char **plaintext,
378
mandos_context *mc){
268
char **plaintext){
379
269
gpgme_data_t dh_crypto, dh_plain;
380
270
gpgme_error_t rc;
381
271
ssize_t ret;
383
273
ssize_t plaintext_length = 0;
384
274
385
275
if(debug){
386
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
387
277
}
388
278
389
279
/* Create new GPGME data buffer from memory cryptotext */
390
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
391
281
0);
392
282
if(rc != GPG_ERR_NO_ERROR){
393
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
394
gpgme_strsource(rc), gpgme_strerror(rc));
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
395
285
return -1;
396
286
}
397
287
398
288
/* Create new empty GPGME data buffer for the plaintext */
399
289
rc = gpgme_data_new(&dh_plain);
400
290
if(rc != GPG_ERR_NO_ERROR){
401
fprintf_plus(stderr, "Mandos plugin mandos-client: "
402
"bad gpgme_data_new: %s: %s\n",
403
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
404
293
gpgme_data_release(dh_crypto);
405
294
return -1;
406
295
}
407
296
408
297
/* Decrypt data from the cryptotext data buffer to the plaintext
409
298
data buffer */
410
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
411
300
if(rc != GPG_ERR_NO_ERROR){
412
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
413
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
414
303
plaintext_length = -1;
415
304
if(debug){
416
305
gpgme_decrypt_result_t result;
417
result = gpgme_op_decrypt_result(mc->ctx);
306
result = gpgme_op_decrypt_result(mc.ctx);
418
307
if(result == NULL){
419
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
420
309
} else {
421
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
422
result->unsupported_algorithm);
423
fprintf_plus(stderr, "Wrong key usage: %u\n",
424
result->wrong_key_usage);
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
425
314
if(result->file_name != NULL){
426
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
427
316
}
428
317
gpgme_recipient_t recipient;
429
318
recipient = result->recipients;
430
319
while(recipient != NULL){
431
fprintf_plus(stderr, "Public key algorithm: %s\n",
432
gpgme_pubkey_algo_name
433
(recipient->pubkey_algo));
434
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
435
fprintf_plus(stderr, "Secret key available: %s\n",
436
recipient->status == GPG_ERR_NO_SECKEY
437
? "No" : "Yes");
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
325
? "No" : "Yes");
438
326
recipient = recipient->next;
439
327
}
440
328
}
443
331
}
444
332
445
333
if(debug){
446
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
334
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
447
335
}
448
336
449
337
/* Seek back to the beginning of the GPGME plaintext data buffer */
450
338
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
451
perror_plus("gpgme_data_seek");
339
perror("gpgme_data_seek");
452
340
plaintext_length = -1;
453
341
goto decrypt_end;
454
342
}
456
344
*plaintext = NULL;
457
345
while(true){
458
346
plaintext_capacity = incbuffer(plaintext,
459
(size_t)plaintext_length,
460
plaintext_capacity);
347
(size_t)plaintext_length,
348
plaintext_capacity);
461
349
if(plaintext_capacity == 0){
462
perror_plus("incbuffer");
463
plaintext_length = -1;
464
goto decrypt_end;
350
perror("incbuffer");
351
plaintext_length = -1;
352
goto decrypt_end;
465
353
}
466
354
467
355
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
472
360
break;
473
361
}
474
362
if(ret < 0){
475
perror_plus("gpgme_data_read");
363
perror("gpgme_data_read");
476
364
plaintext_length = -1;
477
365
goto decrypt_end;
478
366
}
480
368
}
481
369
482
370
if(debug){
483
fprintf_plus(stderr, "Decrypted password is: ");
371
fprintf(stderr, "Decrypted password is: ");
484
372
for(ssize_t i = 0; i < plaintext_length; i++){
485
373
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
486
374
}
497
385
return plaintext_length;
498
386
}
499
387
500
__attribute__((warn_unused_result, const))
501
static const char *safe_string(const char *str){
502
if(str == NULL)
503
return "(unknown)";
504
return str;
505
}
506
507
__attribute__((warn_unused_result))
508
static const char *safer_gnutls_strerror(int value){
509
const char *ret = gnutls_strerror(value);
510
return safe_string(ret);
388
static const char * safer_gnutls_strerror(int value){
389
const char *ret = gnutls_strerror(value); /* Spurious warning from
390
-Wunreachable-code */
391
if(ret == NULL)
392
ret = "(unknown)";
393
return ret;
511
394
}
512
395
513
396
/* GnuTLS log function callback */
514
__attribute__((nonnull))
515
397
static void debuggnutls(__attribute__((unused)) int level,
516
398
const char* string){
517
fprintf_plus(stderr, "GnuTLS: %s", string);
399
fprintf(stderr, "GnuTLS: %s", string);
518
400
}
519
401
520
__attribute__((nonnull(1, 2, 4), warn_unused_result))
521
402
static int init_gnutls_global(const char *pubkeyfilename,
522
const char *seckeyfilename,
523
const char *dhparamsfilename,
524
mandos_context *mc){
403
const char *seckeyfilename){
525
404
int ret;
526
unsigned int uret;
527
405
528
406
if(debug){
529
fprintf_plus(stderr, "Initializing GnuTLS\n");
407
fprintf(stderr, "Initializing GnuTLS\n");
408
}
409
410
ret = gnutls_global_init();
411
if(ret != GNUTLS_E_SUCCESS){
412
fprintf(stderr, "GnuTLS global_init: %s\n",
413
safer_gnutls_strerror(ret));
414
return -1;
530
415
}
531
416
532
417
if(debug){
538
423
}
539
424
540
425
/* OpenPGP credentials */
541
ret = gnutls_certificate_allocate_credentials(&mc->cred);
426
ret = gnutls_certificate_allocate_credentials(&mc.cred);
542
427
if(ret != GNUTLS_E_SUCCESS){
543
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
544
safer_gnutls_strerror(ret));
428
fprintf(stderr, "GnuTLS memory error: %s\n",
429
safer_gnutls_strerror(ret));
430
gnutls_global_deinit();
545
431
return -1;
546
432
}
547
433
548
434
if(debug){
549
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
550
" secret key %s as GnuTLS credentials\n",
551
pubkeyfilename,
552
seckeyfilename);
435
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
436
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
437
seckeyfilename);
553
438
}
554
439
555
440
ret = gnutls_certificate_set_openpgp_key_file
556
(mc->cred, pubkeyfilename, seckeyfilename,
441
(mc.cred, pubkeyfilename, seckeyfilename,
557
442
GNUTLS_OPENPGP_FMT_BASE64);
558
443
if(ret != GNUTLS_E_SUCCESS){
559
fprintf_plus(stderr,
560
"Error[%d] while reading the OpenPGP key pair ('%s',"
561
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
562
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
563
safer_gnutls_strerror(ret));
444
fprintf(stderr,
445
"Error[%d] while reading the OpenPGP key pair ('%s',"
446
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
447
fprintf(stderr, "The GnuTLS error is: %s\n",
448
safer_gnutls_strerror(ret));
564
449
goto globalfail;
565
450
}
566
451
567
452
/* GnuTLS server initialization */
568
ret = gnutls_dh_params_init(&mc->dh_params);
569
if(ret != GNUTLS_E_SUCCESS){
570
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
571
" initialization: %s\n",
572
safer_gnutls_strerror(ret));
573
goto globalfail;
574
}
575
/* If a Diffie-Hellman parameters file was given, try to use it */
576
if(dhparamsfilename != NULL){
577
gnutls_datum_t params = { .data = NULL, .size = 0 };
578
do {
579
int dhpfile = open(dhparamsfilename, O_RDONLY);
580
if(dhpfile == -1){
581
perror_plus("open");
582
dhparamsfilename = NULL;
583
break;
584
}
585
size_t params_capacity = 0;
586
while(true){
587
params_capacity = incbuffer((char **)¶ms.data,
588
(size_t)params.size,
589
(size_t)params_capacity);
590
if(params_capacity == 0){
591
perror_plus("incbuffer");
592
free(params.data);
593
params.data = NULL;
594
dhparamsfilename = NULL;
595
break;
596
}
597
ssize_t bytes_read = read(dhpfile,
598
params.data + params.size,
599
BUFFER_SIZE);
600
/* EOF */
601
if(bytes_read == 0){
602
break;
603
}
604
/* check bytes_read for failure */
605
if(bytes_read < 0){
606
perror_plus("read");
607
free(params.data);
608
params.data = NULL;
609
dhparamsfilename = NULL;
610
break;
611
}
612
params.size += (unsigned int)bytes_read;
613
}
614
if(params.data == NULL){
615
dhparamsfilename = NULL;
616
}
617
if(dhparamsfilename == NULL){
618
break;
619
}
620
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
621
GNUTLS_X509_FMT_PEM);
622
if(ret != GNUTLS_E_SUCCESS){
623
fprintf_plus(stderr, "Failed to parse DH parameters in file"
624
" \"%s\": %s\n", dhparamsfilename,
625
safer_gnutls_strerror(ret));
626
dhparamsfilename = NULL;
627
}
628
} while(false);
629
}
630
if(dhparamsfilename == NULL){
631
if(mc->dh_bits == 0){
632
/* Find out the optimal number of DH bits */
633
/* Try to read the private key file */
634
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
635
do {
636
int secfile = open(seckeyfilename, O_RDONLY);
637
if(secfile == -1){
638
perror_plus("open");
639
break;
640
}
641
size_t buffer_capacity = 0;
642
while(true){
643
buffer_capacity = incbuffer((char **)&buffer.data,
644
(size_t)buffer.size,
645
(size_t)buffer_capacity);
646
if(buffer_capacity == 0){
647
perror_plus("incbuffer");
648
free(buffer.data);
649
buffer.data = NULL;
650
break;
651
}
652
ssize_t bytes_read = read(secfile,
653
buffer.data + buffer.size,
654
BUFFER_SIZE);
655
/* EOF */
656
if(bytes_read == 0){
657
break;
658
}
659
/* check bytes_read for failure */
660
if(bytes_read < 0){
661
perror_plus("read");
662
free(buffer.data);
663
buffer.data = NULL;
664
break;
665
}
666
buffer.size += (unsigned int)bytes_read;
667
}
668
close(secfile);
669
} while(false);
670
/* If successful, use buffer to parse private key */
671
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
672
if(buffer.data != NULL){
673
{
674
gnutls_openpgp_privkey_t privkey = NULL;
675
ret = gnutls_openpgp_privkey_init(&privkey);
676
if(ret != GNUTLS_E_SUCCESS){
677
fprintf_plus(stderr, "Error initializing OpenPGP key"
678
" structure: %s",
679
safer_gnutls_strerror(ret));
680
free(buffer.data);
681
buffer.data = NULL;
682
} else {
683
ret = gnutls_openpgp_privkey_import
684
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
687
safer_gnutls_strerror(ret));
688
privkey = NULL;
689
}
690
free(buffer.data);
691
buffer.data = NULL;
692
if(privkey != NULL){
693
/* Use private key to suggest an appropriate
694
sec_param */
695
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
696
gnutls_openpgp_privkey_deinit(privkey);
697
if(debug){
698
fprintf_plus(stderr, "This OpenPGP key implies using"
699
" a GnuTLS security parameter \"%s\".\n",
700
safe_string(gnutls_sec_param_get_name
701
(sec_param)));
702
}
703
}
704
}
705
}
706
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
707
/* Err on the side of caution */
708
sec_param = GNUTLS_SEC_PARAM_ULTRA;
709
if(debug){
710
fprintf_plus(stderr, "Falling back to security parameter"
711
" \"%s\"\n",
712
safe_string(gnutls_sec_param_get_name
713
(sec_param)));
714
}
715
}
716
}
717
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
718
if(uret != 0){
719
mc->dh_bits = uret;
720
if(debug){
721
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
722
" implies %u DH bits; using that.\n",
723
safe_string(gnutls_sec_param_get_name
724
(sec_param)),
725
mc->dh_bits);
726
}
727
} else {
728
fprintf_plus(stderr, "Failed to get implied number of DH"
729
" bits for security parameter \"%s\"): %s\n",
730
safe_string(gnutls_sec_param_get_name
731
(sec_param)),
732
safer_gnutls_strerror(ret));
733
goto globalfail;
734
}
735
} else if(debug){
736
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
737
mc->dh_bits);
738
}
739
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
740
if(ret != GNUTLS_E_SUCCESS){
741
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
742
" bits): %s\n", mc->dh_bits,
743
safer_gnutls_strerror(ret));
744
goto globalfail;
745
}
746
}
747
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
453
ret = gnutls_dh_params_init(&mc.dh_params);
454
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
456
" %s\n", safer_gnutls_strerror(ret));
457
goto globalfail;
458
}
459
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
460
if(ret != GNUTLS_E_SUCCESS){
461
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
462
safer_gnutls_strerror(ret));
463
goto globalfail;
464
}
465
466
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
748
467
749
468
return 0;
750
469
751
470
globalfail:
752
471
753
gnutls_certificate_free_credentials(mc->cred);
754
gnutls_dh_params_deinit(mc->dh_params);
472
gnutls_certificate_free_credentials(mc.cred);
473
gnutls_global_deinit();
474
gnutls_dh_params_deinit(mc.dh_params);
755
475
return -1;
756
476
}
757
477
758
__attribute__((nonnull, warn_unused_result))
759
static int init_gnutls_session(gnutls_session_t *session,
760
mandos_context *mc){
478
static int init_gnutls_session(gnutls_session_t *session){
761
479
int ret;
762
480
/* GnuTLS session creation */
763
481
do {
767
485
}
768
486
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
769
487
if(ret != GNUTLS_E_SUCCESS){
770
fprintf_plus(stderr,
771
"Error in GnuTLS session initialization: %s\n",
772
safer_gnutls_strerror(ret));
488
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
489
safer_gnutls_strerror(ret));
773
490
}
774
491
775
492
{
776
493
const char *err;
777
494
do {
778
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
495
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
779
496
if(quit_now){
780
497
gnutls_deinit(*session);
781
498
return -1;
782
499
}
783
500
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
784
501
if(ret != GNUTLS_E_SUCCESS){
785
fprintf_plus(stderr, "Syntax error at: %s\n", err);
786
fprintf_plus(stderr, "GnuTLS error: %s\n",
787
safer_gnutls_strerror(ret));
502
fprintf(stderr, "Syntax error at: %s\n", err);
503
fprintf(stderr, "GnuTLS error: %s\n",
504
safer_gnutls_strerror(ret));
788
505
gnutls_deinit(*session);
789
506
return -1;
790
507
}
792
509
793
510
do {
794
511
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
795
mc->cred);
512
mc.cred);
796
513
if(quit_now){
797
514
gnutls_deinit(*session);
798
515
return -1;
799
516
}
800
517
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
801
518
if(ret != GNUTLS_E_SUCCESS){
802
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
803
safer_gnutls_strerror(ret));
519
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
520
safer_gnutls_strerror(ret));
804
521
gnutls_deinit(*session);
805
522
return -1;
806
523
}
808
525
/* ignore client certificate if any. */
809
526
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
810
527
528
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
529
811
530
return 0;
812
531
}
813
532
815
534
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
816
535
__attribute__((unused)) const char *txt){}
817
536
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
int raise_privileges(void){
821
int old_errno = errno;
822
int ret = 0;
823
if(seteuid(0) == -1){
824
ret = errno;
825
}
826
errno = old_errno;
827
return ret;
828
}
829
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
int raise_privileges_permanently(void){
833
int old_errno = errno;
834
int ret = raise_privileges();
835
if(ret != 0){
836
errno = old_errno;
837
return ret;
838
}
839
if(setuid(0) == -1){
840
ret = errno;
841
}
842
errno = old_errno;
843
return ret;
844
}
845
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
int lower_privileges(void){
849
int old_errno = errno;
850
int ret = 0;
851
if(seteuid(uid) == -1){
852
ret = errno;
853
}
854
errno = old_errno;
855
return ret;
856
}
857
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
int lower_privileges_permanently(void){
861
int old_errno = errno;
862
int ret = 0;
863
if(setuid(uid) == -1){
864
ret = errno;
865
}
866
errno = old_errno;
867
return ret;
868
}
869
870
/* Helper function to add_local_route() and delete_local_route() */
871
__attribute__((nonnull, warn_unused_result))
872
static bool add_delete_local_route(const bool add,
873
const char *address,
874
AvahiIfIndex if_index){
875
int ret;
876
char helper[] = "mandos-client-iprouteadddel";
877
char add_arg[] = "add";
878
char delete_arg[] = "delete";
879
char debug_flag[] = "--debug";
880
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
881
if(pluginhelperdir == NULL){
882
if(debug){
883
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
884
" variable not set; cannot run helper\n");
885
}
886
return false;
887
}
888
889
char interface[IF_NAMESIZE];
890
if(if_indextoname((unsigned int)if_index, interface) == NULL){
891
perror_plus("if_indextoname");
892
return false;
893
}
894
895
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
896
if(devnull == -1){
897
perror_plus("open(\"/dev/null\", O_RDONLY)");
898
return false;
899
}
900
pid_t pid = fork();
901
if(pid == 0){
902
/* Child */
903
/* Raise privileges */
904
errno = raise_privileges_permanently();
905
if(errno != 0){
906
perror_plus("Failed to raise privileges");
907
/* _exit(EX_NOPERM); */
908
} else {
909
/* Set group */
910
errno = 0;
911
ret = setgid(0);
912
if(ret == -1){
913
perror_plus("setgid");
914
_exit(EX_NOPERM);
915
}
916
/* Reset supplementary groups */
917
errno = 0;
918
ret = setgroups(0, NULL);
919
if(ret == -1){
920
perror_plus("setgroups");
921
_exit(EX_NOPERM);
922
}
923
}
924
ret = dup2(devnull, STDIN_FILENO);
925
if(ret == -1){
926
perror_plus("dup2(devnull, STDIN_FILENO)");
927
_exit(EX_OSERR);
928
}
929
ret = close(devnull);
930
if(ret == -1){
931
perror_plus("close");
932
_exit(EX_OSERR);
933
}
934
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
935
if(ret == -1){
936
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
937
_exit(EX_OSERR);
938
}
939
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
940
O_RDONLY
941
| O_DIRECTORY
942
| O_PATH
943
| O_CLOEXEC));
944
if(helperdir_fd == -1){
945
perror_plus("open");
946
_exit(EX_UNAVAILABLE);
947
}
948
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
949
helper, O_RDONLY));
950
if(helper_fd == -1){
951
perror_plus("openat");
952
close(helperdir_fd);
953
_exit(EX_UNAVAILABLE);
954
}
955
close(helperdir_fd);
956
#ifdef __GNUC__
957
#pragma GCC diagnostic push
958
#pragma GCC diagnostic ignored "-Wcast-qual"
959
#endif
960
if(fexecve(helper_fd, (char *const [])
961
{ helper, add ? add_arg : delete_arg, (char *)address,
962
interface, debug ? debug_flag : NULL, NULL },
963
environ) == -1){
964
#ifdef __GNUC__
965
#pragma GCC diagnostic pop
966
#endif
967
perror_plus("fexecve");
968
_exit(EXIT_FAILURE);
969
}
970
}
971
if(pid == -1){
972
perror_plus("fork");
973
return false;
974
}
975
int status;
976
pid_t pret = -1;
977
errno = 0;
978
do {
979
pret = waitpid(pid, &status, 0);
980
if(pret == -1 and errno == EINTR and quit_now){
981
int errno_raising = 0;
982
if((errno = raise_privileges()) != 0){
983
errno_raising = errno;
984
perror_plus("Failed to raise privileges in order to"
985
" kill helper program");
986
}
987
if(kill(pid, SIGTERM) == -1){
988
perror_plus("kill");
989
}
990
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
991
perror_plus("Failed to lower privileges after killing"
992
" helper program");
993
}
994
return false;
995
}
996
} while(pret == -1 and errno == EINTR);
997
if(pret == -1){
998
perror_plus("waitpid");
999
return false;
1000
}
1001
if(WIFEXITED(status)){
1002
if(WEXITSTATUS(status) != 0){
1003
fprintf_plus(stderr, "Error: iprouteadddel exited"
1004
" with status %d\n", WEXITSTATUS(status));
1005
return false;
1006
}
1007
return true;
1008
}
1009
if(WIFSIGNALED(status)){
1010
fprintf_plus(stderr, "Error: iprouteadddel died by"
1011
" signal %d\n", WTERMSIG(status));
1012
return false;
1013
}
1014
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1015
return false;
1016
}
1017
1018
__attribute__((nonnull, warn_unused_result))
1019
static bool add_local_route(const char *address,
1020
AvahiIfIndex if_index){
1021
if(debug){
1022
fprintf_plus(stderr, "Adding route to %s\n", address);
1023
}
1024
return add_delete_local_route(true, address, if_index);
1025
}
1026
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool delete_local_route(const char *address,
1029
AvahiIfIndex if_index){
1030
if(debug){
1031
fprintf_plus(stderr, "Removing route to %s\n", address);
1032
}
1033
return add_delete_local_route(false, address, if_index);
1034
}
1035
1036
537
/* Called when a Mandos server is found */
1037
__attribute__((nonnull, warn_unused_result))
1038
static int start_mandos_communication(const char *ip, in_port_t port,
538
static int start_mandos_communication(const char *ip, uint16_t port,
1039
539
AvahiIfIndex if_index,
1040
int af, mandos_context *mc){
540
int af){
1041
541
int ret, tcp_sd = -1;
1042
542
ssize_t sret;
1043
struct sockaddr_storage to;
543
union {
544
struct sockaddr_in in;
545
struct sockaddr_in6 in6;
546
} to;
1044
547
char *buffer = NULL;
1045
548
char *decrypted_buffer = NULL;
1046
549
size_t buffer_length = 0;
1049
552
int retval = -1;
1050
553
gnutls_session_t session;
1051
554
int pf; /* Protocol family */
1052
bool route_added = false;
1053
555
1054
556
errno = 0;
1055
557
1066
568
pf = PF_INET;
1067
569
break;
1068
570
default:
1069
fprintf_plus(stderr, "Bad address family: %d\n", af);
571
fprintf(stderr, "Bad address family: %d\n", af);
1070
572
errno = EINVAL;
1071
573
return -1;
1072
574
}
1073
575
1074
/* If the interface is specified and we have a list of interfaces */
1075
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1076
/* Check if the interface is one of the interfaces we are using */
1077
bool match = false;
1078
{
1079
char *interface = NULL;
1080
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1081
interface))){
1082
if(if_nametoindex(interface) == (unsigned int)if_index){
1083
match = true;
1084
break;
1085
}
1086
}
1087
}
1088
if(not match){
1089
/* This interface does not match any in the list, so we don't
1090
connect to the server */
1091
if(debug){
1092
char interface[IF_NAMESIZE];
1093
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1094
perror_plus("if_indextoname");
1095
} else {
1096
fprintf_plus(stderr, "Skipping server on non-used interface"
1097
" \"%s\"\n",
1098
if_indextoname((unsigned int)if_index,
1099
interface));
1100
}
1101
}
1102
return -1;
1103
}
1104
}
1105
1106
ret = init_gnutls_session(&session, mc);
576
ret = init_gnutls_session(&session);
1107
577
if(ret != 0){
1108
578
return -1;
1109
579
}
1110
580
1111
581
if(debug){
1112
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1113
PRIuMAX "\n", ip, (uintmax_t)port);
582
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
583
"\n", ip, port);
1114
584
}
1115
585
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
586
tcp_sd = socket(pf, SOCK_STREAM, 0);
1117
587
if(tcp_sd < 0){
1118
588
int e = errno;
1119
perror_plus("socket");
589
perror("socket");
1120
590
errno = e;
1121
591
goto mandos_end;
1122
592
}
1126
596
goto mandos_end;
1127
597
}
1128
598
599
memset(&to, 0, sizeof(to));
1129
600
if(af == AF_INET6){
1130
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1131
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1132
ret = inet_pton(af, ip, &to6->sin6_addr);
601
to.in6.sin6_family = (sa_family_t)af;
602
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1133
603
} else { /* IPv4 */
1134
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1135
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to4->sin_addr);
604
to.in.sin_family = (sa_family_t)af;
605
ret = inet_pton(af, ip, &to.in.sin_addr);
1137
606
}
1138
607
if(ret < 0 ){
1139
608
int e = errno;
1140
perror_plus("inet_pton");
609
perror("inet_pton");
1141
610
errno = e;
1142
611
goto mandos_end;
1143
612
}
1144
613
if(ret == 0){
1145
614
int e = errno;
1146
fprintf_plus(stderr, "Bad address: %s\n", ip);
615
fprintf(stderr, "Bad address: %s\n", ip);
1147
616
errno = e;
1148
617
goto mandos_end;
1149
618
}
1150
619
if(af == AF_INET6){
1151
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1152
if(IN6_IS_ADDR_LINKLOCAL
1153
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
620
to.in6.sin6_port = htons(port); /* Spurious warnings from
621
-Wconversion and
622
-Wunreachable-code */
623
624
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
625
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
626
-Wunreachable-code*/
1154
627
if(if_index == AVAHI_IF_UNSPEC){
1155
fprintf_plus(stderr, "An IPv6 link-local address is"
1156
" incomplete without a network interface\n");
628
fprintf(stderr, "An IPv6 link-local address is incomplete"
629
" without a network interface\n");
1157
630
errno = EINVAL;
1158
631
goto mandos_end;
1159
632
}
1160
633
/* Set the network interface number as scope */
1161
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
634
to.in6.sin6_scope_id = (uint32_t)if_index;
1162
635
}
1163
636
} else {
1164
((struct sockaddr_in *)&to)->sin_port = htons(port);
637
to.in.sin_port = htons(port); /* Spurious warnings from
638
-Wconversion and
639
-Wunreachable-code */
1165
640
}
1166
641
1167
642
if(quit_now){
1173
648
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1174
649
char interface[IF_NAMESIZE];
1175
650
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1176
perror_plus("if_indextoname");
651
perror("if_indextoname");
1177
652
} else {
1178
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1179
"\n", ip, interface, (uintmax_t)port);
653
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
654
ip, interface, port);
1180
655
}
1181
656
} else {
1182
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1183
ip, (uintmax_t)port);
657
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
658
port);
1184
659
}
1185
660
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1186
661
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1187
if(af == AF_INET6){
1188
ret = getnameinfo((struct sockaddr *)&to,
1189
sizeof(struct sockaddr_in6),
1190
addrstr, sizeof(addrstr), NULL, 0,
1191
NI_NUMERICHOST);
1192
} else {
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
}
1198
if(ret == EAI_SYSTEM){
1199
perror_plus("getnameinfo");
1200
} else if(ret != 0) {
1201
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1202
} else if(strcmp(addrstr, ip) != 0){
1203
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1204
}
1205
}
1206
1207
if(quit_now){
1208
errno = EINTR;
1209
goto mandos_end;
1210
}
1211
1212
while(true){
1213
if(af == AF_INET6){
1214
ret = connect(tcp_sd, (struct sockaddr *)&to,
1215
sizeof(struct sockaddr_in6));
1216
} else {
1217
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1218
sizeof(struct sockaddr_in));
1219
}
1220
if(ret < 0){
1221
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1222
and if_index != AVAHI_IF_UNSPEC
1223
and connect_to == NULL
1224
and not route_added and
1225
((af == AF_INET6 and not
1226
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1227
&to)->sin6_addr)))
1228
or (af == AF_INET and
1229
/* Not a a IPv4LL address */
1230
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1231
& 0xFFFF0000L) != 0xA9FE0000L))){
1232
/* Work around Avahi bug - Avahi does not announce link-local
1233
addresses if it has a global address, so local hosts with
1234
*only* a link-local address (e.g. Mandos clients) cannot
1235
connect to a Mandos server announced by Avahi on a server
1236
host with a global address. Work around this by retrying
1237
with an explicit route added with the server's address.
1238
1239
Avahi bug reference:
1240
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1241
https://bugs.debian.org/587961
1242
*/
1243
if(debug){
1244
fprintf_plus(stderr, "Mandos server unreachable, trying"
1245
" direct route\n");
1246
}
1247
int e = errno;
1248
route_added = add_local_route(ip, if_index);
1249
if(route_added){
1250
continue;
1251
}
1252
errno = e;
1253
}
1254
if(errno != ECONNREFUSED or debug){
1255
int e = errno;
1256
perror_plus("connect");
1257
errno = e;
1258
}
1259
goto mandos_end;
1260
}
1261
1262
if(quit_now){
1263
errno = EINTR;
1264
goto mandos_end;
1265
}
1266
break;
662
const char *pcret;
663
if(af == AF_INET6){
664
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
665
sizeof(addrstr));
666
} else {
667
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
668
sizeof(addrstr));
669
}
670
if(pcret == NULL){
671
perror("inet_ntop");
672
} else {
673
if(strcmp(addrstr, ip) != 0){
674
fprintf(stderr, "Canonical address form: %s\n", addrstr);
675
}
676
}
677
}
678
679
if(quit_now){
680
errno = EINTR;
681
goto mandos_end;
682
}
683
684
if(af == AF_INET6){
685
ret = connect(tcp_sd, &to.in6, sizeof(to));
686
} else {
687
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
688
}
689
if(ret < 0){
690
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
691
int e = errno;
692
perror("connect");
693
errno = e;
694
}
695
goto mandos_end;
696
}
697
698
if(quit_now){
699
errno = EINTR;
700
goto mandos_end;
1267
701
}
1268
702
1269
703
const char *out = mandos_protocol_version;
1271
705
while(true){
1272
706
size_t out_size = strlen(out);
1273
707
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1274
out_size - written));
708
out_size - written));
1275
709
if(ret == -1){
1276
710
int e = errno;
1277
perror_plus("write");
711
perror("write");
1278
712
errno = e;
1279
713
goto mandos_end;
1280
714
}
1297
731
}
1298
732
1299
733
if(debug){
1300
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
734
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1301
735
}
1302
736
1303
737
if(quit_now){
1305
739
goto mandos_end;
1306
740
}
1307
741
1308
/* This casting via intptr_t is to eliminate warning about casting
1309
an int to a pointer type. This is exactly how the GnuTLS Guile
1310
function "set-session-transport-fd!" does it. */
1311
gnutls_transport_set_ptr(session,
1312
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
742
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1313
743
1314
744
if(quit_now){
1315
745
errno = EINTR;
1326
756
1327
757
if(ret != GNUTLS_E_SUCCESS){
1328
758
if(debug){
1329
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
759
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1330
760
gnutls_perror(ret);
1331
761
}
1332
762
errno = EPROTO;
1336
766
/* Read OpenPGP packet that contains the wanted password */
1337
767
1338
768
if(debug){
1339
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1340
" %s\n", ip);
769
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
770
ip);
1341
771
}
1342
772
1343
773
while(true){
1348
778
}
1349
779
1350
780
buffer_capacity = incbuffer(&buffer, buffer_length,
1351
buffer_capacity);
781
buffer_capacity);
1352
782
if(buffer_capacity == 0){
1353
783
int e = errno;
1354
perror_plus("incbuffer");
784
perror("incbuffer");
1355
785
errno = e;
1356
786
goto mandos_end;
1357
787
}
1381
811
}
1382
812
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1383
813
if(ret < 0){
1384
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1385
"***\n");
814
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1386
815
gnutls_perror(ret);
1387
816
errno = EPROTO;
1388
817
goto mandos_end;
1389
818
}
1390
819
break;
1391
820
default:
1392
fprintf_plus(stderr, "Unknown error while reading data from"
1393
" encrypted session with Mandos server\n");
821
fprintf(stderr, "Unknown error while reading data from"
822
" encrypted session with Mandos server\n");
1394
823
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1395
824
errno = EIO;
1396
825
goto mandos_end;
1401
830
}
1402
831
1403
832
if(debug){
1404
fprintf_plus(stderr, "Closing TLS session\n");
833
fprintf(stderr, "Closing TLS session\n");
1405
834
}
1406
835
1407
836
if(quit_now){
1419
848
1420
849
if(buffer_length > 0){
1421
850
ssize_t decrypted_buffer_size;
1422
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1423
&decrypted_buffer, mc);
851
decrypted_buffer_size = pgp_packet_decrypt(buffer,
852
buffer_length,
853
&decrypted_buffer);
1424
854
if(decrypted_buffer_size >= 0){
1425
855
1426
856
written = 0;
1436
866
if(ret == 0 and ferror(stdout)){
1437
867
int e = errno;
1438
868
if(debug){
1439
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1440
strerror(errno));
869
fprintf(stderr, "Error writing encrypted data: %s\n",
870
strerror(errno));
1441
871
}
1442
872
errno = e;
1443
873
goto mandos_end;
1452
882
1453
883
mandos_end:
1454
884
{
1455
if(route_added){
1456
if(not delete_local_route(ip, if_index)){
1457
fprintf_plus(stderr, "Failed to delete local route to %s on"
1458
" interface %d", ip, if_index);
1459
}
1460
}
1461
885
int e = errno;
1462
886
free(decrypted_buffer);
1463
887
free(buffer);
1464
888
if(tcp_sd >= 0){
1465
ret = close(tcp_sd);
889
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1466
890
}
1467
891
if(ret == -1){
1468
892
if(e == 0){
1469
893
e = errno;
1470
894
}
1471
perror_plus("close");
895
perror("close");
1472
896
}
1473
897
gnutls_deinit(session);
1474
errno = e;
1475
898
if(quit_now){
1476
errno = EINTR;
899
e = EINTR;
1477
900
retval = -1;
1478
901
}
902
errno = e;
1479
903
}
1480
904
return retval;
1481
905
}
1482
906
1483
__attribute__((nonnull))
1484
907
static void resolve_callback(AvahiSServiceResolver *r,
1485
908
AvahiIfIndex interface,
1486
909
AvahiProtocol proto,
1494
917
AVAHI_GCC_UNUSED AvahiStringList *txt,
1495
918
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1496
919
flags,
1497
void *mc){
1498
if(r == NULL){
1499
return;
1500
}
920
AVAHI_GCC_UNUSED void* userdata){
921
assert(r);
1501
922
1502
923
/* Called whenever a service has been resolved successfully or
1503
924
timed out */
1504
925
1505
926
if(quit_now){
1506
avahi_s_service_resolver_free(r);
1507
927
return;
1508
928
}
1509
929
1510
930
switch(event){
1511
931
default:
1512
932
case AVAHI_RESOLVER_FAILURE:
1513
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1514
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1515
domain,
1516
avahi_strerror(avahi_server_errno
1517
(((mandos_context*)mc)->server)));
933
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
934
" of type '%s' in domain '%s': %s\n", name, type, domain,
935
avahi_strerror(avahi_server_errno(mc.server)));
1518
936
break;
1519
937
1520
938
case AVAHI_RESOLVER_FOUND:
1522
940
char ip[AVAHI_ADDRESS_STR_MAX];
1523
941
avahi_address_snprint(ip, sizeof(ip), address);
1524
942
if(debug){
1525
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1526
PRIdMAX ") on port %" PRIu16 "\n", name,
1527
host_name, ip, (intmax_t)interface, port);
943
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
944
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
945
ip, (intmax_t)interface, port);
1528
946
}
1529
int ret = start_mandos_communication(ip, (in_port_t)port,
1530
interface,
1531
avahi_proto_to_af(proto),
1532
mc);
947
int ret = start_mandos_communication(ip, port, interface,
948
avahi_proto_to_af(proto));
1533
949
if(ret == 0){
1534
avahi_simple_poll_quit(simple_poll);
1535
} else {
1536
if(not add_server(ip, (in_port_t)port, interface,
1537
avahi_proto_to_af(proto),
1538
&((mandos_context*)mc)->current_server)){
1539
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1540
" list\n", name);
1541
}
950
avahi_simple_poll_quit(mc.simple_poll);
1542
951
}
1543
952
}
1544
953
}
1554
963
const char *domain,
1555
964
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1556
965
flags,
1557
void *mc){
1558
if(b == NULL){
1559
return;
1560
}
966
AVAHI_GCC_UNUSED void* userdata){
967
assert(b);
1561
968
1562
969
/* Called whenever a new services becomes available on the LAN or
1563
970
is removed from the LAN */
1570
977
default:
1571
978
case AVAHI_BROWSER_FAILURE:
1572
979
1573
fprintf_plus(stderr, "(Avahi browser) %s\n",
1574
avahi_strerror(avahi_server_errno
1575
(((mandos_context*)mc)->server)));
1576
avahi_simple_poll_quit(simple_poll);
980
fprintf(stderr, "(Avahi browser) %s\n",
981
avahi_strerror(avahi_server_errno(mc.server)));
982
avahi_simple_poll_quit(mc.simple_poll);
1577
983
return;
1578
984
1579
985
case AVAHI_BROWSER_NEW:
1582
988
the callback function is called the Avahi server will free the
1583
989
resolver for us. */
1584
990
1585
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1586
interface, protocol, name, type,
1587
domain, protocol, 0,
1588
resolve_callback, mc) == NULL)
1589
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1590
" %s\n", name,
1591
avahi_strerror(avahi_server_errno
1592
(((mandos_context*)mc)->server)));
991
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
992
name, type, domain, protocol, 0,
993
resolve_callback, NULL) == NULL)
994
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
995
name, avahi_strerror(avahi_server_errno(mc.server)));
1593
996
break;
1594
997
1595
998
case AVAHI_BROWSER_REMOVE:
1598
1001
case AVAHI_BROWSER_ALL_FOR_NOW:
1599
1002
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1600
1003
if(debug){
1601
fprintf_plus(stderr, "No Mandos server found, still"
1602
" searching...\n");
1004
fprintf(stderr, "No Mandos server found, still searching...\n");
1603
1005
}
1604
1006
break;
1605
1007
}
1606
1008
}
1607
1009
1608
/* Signal handler that stops main loop after SIGTERM */
1010
/* stop main loop after sigterm has been called */
1609
1011
static void handle_sigterm(int sig){
1610
1012
if(quit_now){
1611
1013
return;
1613
1015
quit_now = 1;
1614
1016
signal_received = sig;
1615
1017
int old_errno = errno;
1616
/* set main loop to exit */
1617
if(simple_poll != NULL){
1618
avahi_simple_poll_quit(simple_poll);
1018
if(mc.simple_poll != NULL){
1019
avahi_simple_poll_quit(mc.simple_poll);
1619
1020
}
1620
1021
errno = old_errno;
1621
1022
}
1622
1023
1623
__attribute__((nonnull, warn_unused_result))
1624
bool get_flags(const char *ifname, struct ifreq *ifr){
1625
int ret;
1626
int old_errno;
1627
1628
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1629
if(s < 0){
1630
old_errno = errno;
1631
perror_plus("socket");
1632
errno = old_errno;
1633
return false;
1634
}
1635
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1636
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1637
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1638
if(ret == -1){
1024
/*
1025
* This function determines if a directory entry in /sys/class/net
1026
* corresponds to an acceptable network device.
1027
* (This function is passed to scandir(3) as a filter function.)
1028
*/
1029
int good_interface(const struct dirent *if_entry){
1030
ssize_t ssret;
1031
char *flagname = NULL;
1032
if(if_entry->d_name[0] == '.'){
1033
return 0;
1034
}
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1036
if_entry->d_name);
1037
if(ret < 0){
1038
perror("asprintf");
1039
return 0;
1040
}
1041
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1042
if(flags_fd == -1){
1043
perror("open");
1044
free(flagname);
1045
return 0;
1046
}
1047
free(flagname);
1048
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1049
/* read line from flags_fd */
1050
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1051
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1052
flagstring[(size_t)to_read] = '\0';
1053
if(flagstring == NULL){
1054
perror("malloc");
1055
close(flags_fd);
1056
return 0;
1057
}
1058
while(to_read > 0){
1059
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1060
(size_t)to_read));
1061
if(ssret == -1){
1062
perror("read");
1063
free(flagstring);
1064
close(flags_fd);
1065
return 0;
1066
}
1067
to_read -= ssret;
1068
if(ssret == 0){
1069
break;
1070
}
1071
}
1072
close(flags_fd);
1073
intmax_t tmpmax;
1074
char *tmp;
1075
errno = 0;
1076
tmpmax = strtoimax(flagstring, &tmp, 0);
1077
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1078
and not (isspace(*tmp)))
1079
or tmpmax != (ifreq_flags)tmpmax){
1639
1080
if(debug){
1640
old_errno = errno;
1641
perror_plus("ioctl SIOCGIFFLAGS");
1642
errno = old_errno;
1081
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1082
flagstring, if_entry->d_name);
1643
1083
}
1644
return false;
1084
free(flagstring);
1085
return 0;
1645
1086
}
1646
return true;
1647
}
1648
1649
__attribute__((nonnull, warn_unused_result))
1650
bool good_flags(const char *ifname, const struct ifreq *ifr){
1651
1087
free(flagstring);
1088
ifreq_flags flags = (ifreq_flags)tmpmax;
1652
1089
/* Reject the loopback device */
1653
if(ifr->ifr_flags & IFF_LOOPBACK){
1090
if(flags & IFF_LOOPBACK){
1654
1091
if(debug){
1655
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1656
ifname);
1092
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1093
if_entry->d_name);
1657
1094
}
1658
return false;
1095
return 0;
1659
1096
}
1660
1097
/* Accept point-to-point devices only if connect_to is specified */
1661
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1098
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1662
1099
if(debug){
1663
fprintf_plus(stderr, "Accepting point-to-point interface"
1664
" \"%s\"\n", ifname);
1100
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1101
if_entry->d_name);
1665
1102
}
1666
return true;
1103
return 1;
1667
1104
}
1668
1105
/* Otherwise, reject non-broadcast-capable devices */
1669
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1106
if(not (flags & IFF_BROADCAST)){
1670
1107
if(debug){
1671
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1672
" \"%s\"\n", ifname);
1108
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1109
if_entry->d_name);
1673
1110
}
1674
return false;
1111
return 0;
1675
1112
}
1676
1113
/* Reject non-ARP interfaces (including dummy interfaces) */
1677
if(ifr->ifr_flags & IFF_NOARP){
1114
if(flags & IFF_NOARP){
1678
1115
if(debug){
1679
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1680
ifname);
1116
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1117
if_entry->d_name);
1681
1118
}
1682
return false;
1119
return 0;
1683
1120
}
1684
1685
1121
/* Accept this device */
1686
1122
if(debug){
1687
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1688
}
1689
return true;
1690
}
1691
1692
/*
1693
* This function determines if a directory entry in /sys/class/net
1694
* corresponds to an acceptable network device.
1695
* (This function is passed to scandir(3) as a filter function.)
1696
*/
1697
__attribute__((nonnull, warn_unused_result))
1698
int good_interface(const struct dirent *if_entry){
1699
if(if_entry->d_name[0] == '.'){
1700
return 0;
1701
}
1702
1703
struct ifreq ifr;
1704
if(not get_flags(if_entry->d_name, &ifr)){
1705
if(debug){
1706
fprintf_plus(stderr, "Failed to get flags for interface "
1707
"\"%s\"\n", if_entry->d_name);
1708
}
1709
return 0;
1710
}
1711
1712
if(not good_flags(if_entry->d_name, &ifr)){
1713
return 0;
1714
}
1715
return 1;
1716
}
1717
1718
/*
1719
* This function determines if a network interface is up.
1720
*/
1721
__attribute__((nonnull, warn_unused_result))
1722
bool interface_is_up(const char *interface){
1723
struct ifreq ifr;
1724
if(not get_flags(interface, &ifr)){
1725
if(debug){
1726
fprintf_plus(stderr, "Failed to get flags for interface "
1727
"\"%s\"\n", interface);
1728
}
1729
return false;
1730
}
1731
1732
return (bool)(ifr.ifr_flags & IFF_UP);
1733
}
1734
1735
/*
1736
* This function determines if a network interface is running
1737
*/
1738
__attribute__((nonnull, warn_unused_result))
1739
bool interface_is_running(const char *interface){
1740
struct ifreq ifr;
1741
if(not get_flags(interface, &ifr)){
1742
if(debug){
1743
fprintf_plus(stderr, "Failed to get flags for interface "
1744
"\"%s\"\n", interface);
1745
}
1746
return false;
1747
}
1748
1749
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1750
}
1751
1752
__attribute__((nonnull, pure, warn_unused_result))
1753
int notdotentries(const struct dirent *direntry){
1754
/* Skip "." and ".." */
1755
if(direntry->d_name[0] == '.'
1756
and (direntry->d_name[1] == '\0'
1757
or (direntry->d_name[1] == '.'
1758
and direntry->d_name[2] == '\0'))){
1759
return 0;
1760
}
1761
return 1;
1762
}
1763
1764
/* Is this directory entry a runnable program? */
1765
__attribute__((nonnull, warn_unused_result))
1766
int runnable_hook(const struct dirent *direntry){
1767
int ret;
1768
size_t sret;
1769
struct stat st;
1770
1771
if((direntry->d_name)[0] == '\0'){
1772
/* Empty name? */
1773
return 0;
1774
}
1775
1776
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1777
"abcdefghijklmnopqrstuvwxyz"
1778
"0123456789"
1779
"_.-");
1780
if((direntry->d_name)[sret] != '\0'){
1781
/* Contains non-allowed characters */
1782
if(debug){
1783
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1784
direntry->d_name);
1785
}
1786
return 0;
1787
}
1788
1789
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1790
if(ret == -1){
1791
if(debug){
1792
perror_plus("Could not stat hook");
1793
}
1794
return 0;
1795
}
1796
if(not (S_ISREG(st.st_mode))){
1797
/* Not a regular file */
1798
if(debug){
1799
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1800
direntry->d_name);
1801
}
1802
return 0;
1803
}
1804
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1805
/* Not executable */
1806
if(debug){
1807
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1808
direntry->d_name);
1809
}
1810
return 0;
1811
}
1812
if(debug){
1813
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1814
direntry->d_name);
1815
}
1816
return 1;
1817
}
1818
1819
__attribute__((nonnull, warn_unused_result))
1820
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1821
mandos_context *mc){
1822
int ret;
1823
struct timespec now;
1824
struct timespec waited_time;
1825
intmax_t block_time;
1826
1827
while(true){
1828
if(mc->current_server == NULL){
1829
if(debug){
1830
fprintf_plus(stderr, "Wait until first server is found."
1831
" No timeout!\n");
1832
}
1833
ret = avahi_simple_poll_iterate(s, -1);
1834
} else {
1835
if(debug){
1836
fprintf_plus(stderr, "Check current_server if we should run"
1837
" it, or wait\n");
1838
}
1839
/* the current time */
1840
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1841
if(ret == -1){
1842
perror_plus("clock_gettime");
1843
return -1;
1844
}
1845
/* Calculating in ms how long time between now and server
1846
who we visted longest time ago. Now - last seen. */
1847
waited_time.tv_sec = (now.tv_sec
1848
- mc->current_server->last_seen.tv_sec);
1849
waited_time.tv_nsec = (now.tv_nsec
1850
- mc->current_server->last_seen.tv_nsec);
1851
/* total time is 10s/10,000ms.
1852
Converting to s from ms by dividing by 1,000,
1853
and ns to ms by dividing by 1,000,000. */
1854
block_time = ((retry_interval
1855
- ((intmax_t)waited_time.tv_sec * 1000))
1856
- ((intmax_t)waited_time.tv_nsec / 1000000));
1857
1858
if(debug){
1859
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1860
block_time);
1861
}
1862
1863
if(block_time <= 0){
1864
ret = start_mandos_communication(mc->current_server->ip,
1865
mc->current_server->port,
1866
mc->current_server->if_index,
1867
mc->current_server->af, mc);
1868
if(ret == 0){
1869
avahi_simple_poll_quit(s);
1870
return 0;
1871
}
1872
ret = clock_gettime(CLOCK_MONOTONIC,
1873
&mc->current_server->last_seen);
1874
if(ret == -1){
1875
perror_plus("clock_gettime");
1876
return -1;
1877
}
1878
mc->current_server = mc->current_server->next;
1879
block_time = 0; /* Call avahi to find new Mandos
1880
servers, but don't block */
1881
}
1882
1883
ret = avahi_simple_poll_iterate(s, (int)block_time);
1884
}
1885
if(ret != 0){
1886
if(ret > 0 or errno != EINTR){
1887
return (ret != 1) ? ret : 0;
1888
}
1889
}
1890
}
1891
}
1892
1893
__attribute__((nonnull))
1894
void run_network_hooks(const char *mode, const char *interface,
1895
const float delay){
1896
struct dirent **direntries = NULL;
1897
if(hookdir_fd == -1){
1898
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1899
| O_CLOEXEC);
1900
if(hookdir_fd == -1){
1901
if(errno == ENOENT){
1902
if(debug){
1903
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1904
" found\n", hookdir);
1905
}
1906
} else {
1907
perror_plus("open");
1908
}
1909
return;
1910
}
1911
}
1912
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1913
runnable_hook, alphasort);
1914
if(numhooks == -1){
1915
perror_plus("scandir");
1916
return;
1917
}
1918
struct dirent *direntry;
1919
int ret;
1920
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1921
if(devnull == -1){
1922
perror_plus("open(\"/dev/null\", O_RDONLY)");
1923
return;
1924
}
1925
for(int i = 0; i < numhooks; i++){
1926
direntry = direntries[i];
1927
if(debug){
1928
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1929
direntry->d_name);
1930
}
1931
pid_t hook_pid = fork();
1932
if(hook_pid == 0){
1933
/* Child */
1934
/* Raise privileges */
1935
errno = raise_privileges_permanently();
1936
if(errno != 0){
1937
perror_plus("Failed to raise privileges");
1938
_exit(EX_NOPERM);
1939
}
1940
/* Set group */
1941
errno = 0;
1942
ret = setgid(0);
1943
if(ret == -1){
1944
perror_plus("setgid");
1945
_exit(EX_NOPERM);
1946
}
1947
/* Reset supplementary groups */
1948
errno = 0;
1949
ret = setgroups(0, NULL);
1950
if(ret == -1){
1951
perror_plus("setgroups");
1952
_exit(EX_NOPERM);
1953
}
1954
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1955
if(ret == -1){
1956
perror_plus("setenv");
1957
_exit(EX_OSERR);
1958
}
1959
ret = setenv("DEVICE", interface, 1);
1960
if(ret == -1){
1961
perror_plus("setenv");
1962
_exit(EX_OSERR);
1963
}
1964
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1965
if(ret == -1){
1966
perror_plus("setenv");
1967
_exit(EX_OSERR);
1968
}
1969
ret = setenv("MODE", mode, 1);
1970
if(ret == -1){
1971
perror_plus("setenv");
1972
_exit(EX_OSERR);
1973
}
1974
char *delaystring;
1975
ret = asprintf(&delaystring, "%f", (double)delay);
1976
if(ret == -1){
1977
perror_plus("asprintf");
1978
_exit(EX_OSERR);
1979
}
1980
ret = setenv("DELAY", delaystring, 1);
1981
if(ret == -1){
1982
free(delaystring);
1983
perror_plus("setenv");
1984
_exit(EX_OSERR);
1985
}
1986
free(delaystring);
1987
if(connect_to != NULL){
1988
ret = setenv("CONNECT", connect_to, 1);
1989
if(ret == -1){
1990
perror_plus("setenv");
1991
_exit(EX_OSERR);
1992
}
1993
}
1994
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1995
direntry->d_name,
1996
O_RDONLY));
1997
if(hook_fd == -1){
1998
perror_plus("openat");
1999
_exit(EXIT_FAILURE);
2000
}
2001
if(close(hookdir_fd) == -1){
2002
perror_plus("close");
2003
_exit(EXIT_FAILURE);
2004
}
2005
ret = dup2(devnull, STDIN_FILENO);
2006
if(ret == -1){
2007
perror_plus("dup2(devnull, STDIN_FILENO)");
2008
_exit(EX_OSERR);
2009
}
2010
ret = close(devnull);
2011
if(ret == -1){
2012
perror_plus("close");
2013
_exit(EX_OSERR);
2014
}
2015
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2016
if(ret == -1){
2017
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2018
_exit(EX_OSERR);
2019
}
2020
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2021
environ) == -1){
2022
perror_plus("fexecve");
2023
_exit(EXIT_FAILURE);
2024
}
2025
} else {
2026
if(hook_pid == -1){
2027
perror_plus("fork");
2028
free(direntry);
2029
continue;
2030
}
2031
int status;
2032
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2033
perror_plus("waitpid");
2034
free(direntry);
2035
continue;
2036
}
2037
if(WIFEXITED(status)){
2038
if(WEXITSTATUS(status) != 0){
2039
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2040
" with status %d\n", direntry->d_name,
2041
WEXITSTATUS(status));
2042
free(direntry);
2043
continue;
2044
}
2045
} else if(WIFSIGNALED(status)){
2046
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2047
" signal %d\n", direntry->d_name,
2048
WTERMSIG(status));
2049
free(direntry);
2050
continue;
2051
} else {
2052
fprintf_plus(stderr, "Warning: network hook \"%s\""
2053
" crashed\n", direntry->d_name);
2054
free(direntry);
2055
continue;
2056
}
2057
}
2058
if(debug){
2059
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2060
direntry->d_name);
2061
}
2062
free(direntry);
2063
}
2064
free(direntries);
2065
if(close(hookdir_fd) == -1){
2066
perror_plus("close");
2067
} else {
2068
hookdir_fd = -1;
2069
}
2070
close(devnull);
2071
}
2072
2073
__attribute__((nonnull, warn_unused_result))
2074
int bring_up_interface(const char *const interface,
2075
const float delay){
2076
int old_errno = errno;
2077
int ret;
2078
struct ifreq network;
2079
unsigned int if_index = if_nametoindex(interface);
2080
if(if_index == 0){
2081
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2082
errno = old_errno;
2083
return ENXIO;
2084
}
2085
2086
if(quit_now){
2087
errno = old_errno;
2088
return EINTR;
2089
}
2090
2091
if(not interface_is_up(interface)){
2092
int ret_errno = 0;
2093
int ioctl_errno = 0;
2094
if(not get_flags(interface, &network)){
2095
ret_errno = errno;
2096
fprintf_plus(stderr, "Failed to get flags for interface "
2097
"\"%s\"\n", interface);
2098
errno = old_errno;
2099
return ret_errno;
2100
}
2101
network.ifr_flags |= IFF_UP; /* set flag */
2102
2103
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2104
if(sd == -1){
2105
ret_errno = errno;
2106
perror_plus("socket");
2107
errno = old_errno;
2108
return ret_errno;
2109
}
2110
2111
if(quit_now){
2112
ret = close(sd);
2113
if(ret == -1){
2114
perror_plus("close");
2115
}
2116
errno = old_errno;
2117
return EINTR;
2118
}
2119
2120
if(debug){
2121
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2122
interface);
2123
}
2124
2125
/* Raise privileges */
2126
ret_errno = raise_privileges();
2127
if(ret_errno != 0){
2128
errno = ret_errno;
2129
perror_plus("Failed to raise privileges");
2130
}
2131
2132
#ifdef __linux__
2133
int ret_linux;
2134
bool restore_loglevel = false;
2135
if(ret_errno == 0){
2136
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2137
messages about the network interface to mess up the prompt */
2138
ret_linux = klogctl(8, NULL, 5);
2139
if(ret_linux == -1){
2140
perror_plus("klogctl");
2141
} else {
2142
restore_loglevel = true;
2143
}
2144
}
2145
#endif /* __linux__ */
2146
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2147
ioctl_errno = errno;
2148
#ifdef __linux__
2149
if(restore_loglevel){
2150
ret_linux = klogctl(7, NULL, 0);
2151
if(ret_linux == -1){
2152
perror_plus("klogctl");
2153
}
2154
}
2155
#endif /* __linux__ */
2156
2157
/* If raise_privileges() succeeded above */
2158
if(ret_errno == 0){
2159
/* Lower privileges */
2160
ret_errno = lower_privileges();
2161
if(ret_errno != 0){
2162
errno = ret_errno;
2163
perror_plus("Failed to lower privileges");
2164
}
2165
}
2166
2167
/* Close the socket */
2168
ret = close(sd);
2169
if(ret == -1){
2170
perror_plus("close");
2171
}
2172
2173
if(ret_setflags == -1){
2174
errno = ioctl_errno;
2175
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2176
errno = old_errno;
2177
return ioctl_errno;
2178
}
2179
} else if(debug){
2180
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2181
interface);
2182
}
2183
2184
/* Sleep checking until interface is running.
2185
Check every 0.25s, up to total time of delay */
2186
for(int i=0; i < delay * 4; i++){
2187
if(interface_is_running(interface)){
2188
break;
2189
}
2190
struct timespec sleeptime = { .tv_nsec = 250000000 };
2191
ret = nanosleep(&sleeptime, NULL);
2192
if(ret == -1 and errno != EINTR){
2193
perror_plus("nanosleep");
2194
}
2195
}
2196
2197
errno = old_errno;
2198
return 0;
2199
}
2200
2201
__attribute__((nonnull, warn_unused_result))
2202
int take_down_interface(const char *const interface){
2203
int old_errno = errno;
2204
struct ifreq network;
2205
unsigned int if_index = if_nametoindex(interface);
2206
if(if_index == 0){
2207
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2208
errno = old_errno;
2209
return ENXIO;
2210
}
2211
if(interface_is_up(interface)){
2212
int ret_errno = 0;
2213
int ioctl_errno = 0;
2214
if(not get_flags(interface, &network) and debug){
2215
ret_errno = errno;
2216
fprintf_plus(stderr, "Failed to get flags for interface "
2217
"\"%s\"\n", interface);
2218
errno = old_errno;
2219
return ret_errno;
2220
}
2221
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2222
2223
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2224
if(sd == -1){
2225
ret_errno = errno;
2226
perror_plus("socket");
2227
errno = old_errno;
2228
return ret_errno;
2229
}
2230
2231
if(debug){
2232
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2233
interface);
2234
}
2235
2236
/* Raise privileges */
2237
ret_errno = raise_privileges();
2238
if(ret_errno != 0){
2239
errno = ret_errno;
2240
perror_plus("Failed to raise privileges");
2241
}
2242
2243
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2244
ioctl_errno = errno;
2245
2246
/* If raise_privileges() succeeded above */
2247
if(ret_errno == 0){
2248
/* Lower privileges */
2249
ret_errno = lower_privileges();
2250
if(ret_errno != 0){
2251
errno = ret_errno;
2252
perror_plus("Failed to lower privileges");
2253
}
2254
}
2255
2256
/* Close the socket */
2257
int ret = close(sd);
2258
if(ret == -1){
2259
perror_plus("close");
2260
}
2261
2262
if(ret_setflags == -1){
2263
errno = ioctl_errno;
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2265
errno = old_errno;
2266
return ioctl_errno;
2267
}
2268
} else if(debug){
2269
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2270
interface);
2271
}
2272
2273
errno = old_errno;
2274
return 0;
1123
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1124
if_entry->d_name);
1125
}
1126
return 1;
2275
1127
}
2276
1128
2277
1129
int main(int argc, char *argv[]){
2278
mandos_context mc = { .server = NULL, .dh_bits = 0,
2279
.priority = "SECURE256:!CTYPE-X.509"
2280
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2281
.current_server = NULL, .interfaces = NULL,
2282
.interfaces_size = 0 };
2283
1130
AvahiSServiceBrowser *sb = NULL;
2284
error_t ret_errno;
1131
int error;
2285
1132
int ret;
2286
1133
intmax_t tmpmax;
2287
1134
char *tmp;
2288
1135
int exitcode = EXIT_SUCCESS;
2289
char *interfaces_to_take_down = NULL;
2290
size_t interfaces_to_take_down_size = 0;
2291
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2292
char old_tempdir[] = "/tmp/mandosXXXXXX";
2293
char *tempdir = NULL;
1136
const char *interface = "";
1137
struct ifreq network;
1138
int sd = -1;
1139
bool take_down_interface = false;
1140
uid_t uid;
1141
gid_t gid;
1142
char tempdir[] = "/tmp/mandosXXXXXX";
1143
bool tempdir_created = false;
2294
1144
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2295
1145
const char *seckey = PATHDIR "/" SECKEY;
2296
1146
const char *pubkey = PATHDIR "/" PUBKEY;
2297
const char *dh_params_file = NULL;
2298
char *interfaces_hooks = NULL;
2299
1147
2300
1148
bool gnutls_initialized = false;
2301
1149
bool gpgme_initialized = false;
2302
1150
float delay = 2.5f;
2303
double retry_interval = 10; /* 10s between trying a server and
2304
retrying the same server again */
2305
1151
2306
1152
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2307
1153
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2313
1159
errno = 0;
2314
1160
ret = setgid(gid);
2315
1161
if(ret == -1){
2316
perror_plus("setgid");
1162
perror("setgid");
2317
1163
}
2318
1164
2319
1165
/* Lower user privileges (temporarily) */
2320
1166
errno = 0;
2321
1167
ret = seteuid(uid);
2322
1168
if(ret == -1){
2323
perror_plus("seteuid");
1169
perror("seteuid");
2324
1170
}
2325
1171
2326
1172
if(quit_now){
2353
1199
.doc = "Bit length of the prime number used in the"
2354
1200
" Diffie-Hellman key exchange",
2355
1201
.group = 2 },
2356
{ .name = "dh-params", .key = 134,
2357
.arg = "FILE",
2358
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2359
" for the Diffie-Hellman key exchange",
2360
.group = 2 },
2361
1202
{ .name = "priority", .key = 130,
2362
1203
.arg = "STRING",
2363
1204
.doc = "GnuTLS priority string for the TLS handshake",
2366
1207
.arg = "SECONDS",
2367
1208
.doc = "Maximum delay to wait for interface startup",
2368
1209
.group = 2 },
2369
{ .name = "retry", .key = 132,
2370
.arg = "SECONDS",
2371
.doc = "Retry interval used when denied by the Mandos server",
2372
.group = 2 },
2373
{ .name = "network-hook-dir", .key = 133,
2374
.arg = "DIR",
2375
.doc = "Directory where network hooks are located",
2376
.group = 2 },
2377
1210
/*
2378
1211
* These reproduce what we would get without ARGP_NO_HELP
2379
1212
*/
2397
1230
connect_to = arg;
2398
1231
break;
2399
1232
case 'i': /* --interface */
2400
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2401
arg, (int)',');
2402
if(ret_errno != 0){
2403
argp_error(state, "%s", strerror(ret_errno));
2404
}
1233
interface = arg;
2405
1234
break;
2406
1235
case 's': /* --seckey */
2407
1236
seckey = arg;
2418
1247
}
2419
1248
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2420
1249
break;
2421
case 134: /* --dh-params */
2422
dh_params_file = arg;
2423
break;
2424
1250
case 130: /* --priority */
2425
1251
mc.priority = arg;
2426
1252
break;
2430
1256
if(errno != 0 or tmp == arg or *tmp != '\0'){
2431
1257
argp_error(state, "Bad delay");
2432
1258
}
2433
case 132: /* --retry */
2434
errno = 0;
2435
retry_interval = strtod(arg, &tmp);
2436
if(errno != 0 or tmp == arg or *tmp != '\0'
2437
or (retry_interval * 1000) > INT_MAX
2438
or retry_interval < 0){
2439
argp_error(state, "Bad retry interval");
2440
}
2441
break;
2442
case 133: /* --network-hook-dir */
2443
hookdir = arg;
2444
1259
break;
2445
1260
/*
2446
1261
* These reproduce what we would get without ARGP_NO_HELP
2453
1268
argp_state_help(state, state->out_stream,
2454
1269
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2455
1270
case 'V': /* --version */
2456
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1271
fprintf(state->out_stream, "%s\n", argp_program_version);
2457
1272
exit(argp_err_exit_status);
2458
1273
break;
2459
1274
default:
2466
1281
.args_doc = "",
2467
1282
.doc = "Mandos client -- Get and decrypt"
2468
1283
" passwords from a Mandos server" };
2469
ret_errno = argp_parse(&argp, argc, argv,
2470
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2471
switch(ret_errno){
1284
ret = argp_parse(&argp, argc, argv,
1285
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1286
switch(ret){
2472
1287
case 0:
2473
1288
break;
2474
1289
case ENOMEM:
2475
1290
default:
2476
errno = ret_errno;
2477
perror_plus("argp_parse");
1291
errno = ret;
1292
perror("argp_parse");
2478
1293
exitcode = EX_OSERR;
2479
1294
goto end;
2480
1295
case EINVAL:
2483
1298
}
2484
1299
}
2485
1300
2486
{
2487
/* Work around Debian bug #633582:
2488
<http://bugs.debian.org/633582> */
2489
2490
/* Re-raise privileges */
2491
ret = raise_privileges();
2492
if(ret != 0){
2493
errno = ret;
2494
perror_plus("Failed to raise privileges");
2495
} else {
2496
struct stat st;
2497
2498
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2499
int seckey_fd = open(seckey, O_RDONLY);
2500
if(seckey_fd == -1){
2501
perror_plus("open");
2502
} else {
2503
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2504
if(ret == -1){
2505
perror_plus("fstat");
2506
} else {
2507
if(S_ISREG(st.st_mode)
2508
and st.st_uid == 0 and st.st_gid == 0){
2509
ret = fchown(seckey_fd, uid, gid);
2510
if(ret == -1){
2511
perror_plus("fchown");
2512
}
2513
}
2514
}
2515
close(seckey_fd);
2516
}
2517
}
2518
2519
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2520
int pubkey_fd = open(pubkey, O_RDONLY);
2521
if(pubkey_fd == -1){
2522
perror_plus("open");
2523
} else {
2524
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2525
if(ret == -1){
2526
perror_plus("fstat");
2527
} else {
2528
if(S_ISREG(st.st_mode)
2529
and st.st_uid == 0 and st.st_gid == 0){
2530
ret = fchown(pubkey_fd, uid, gid);
2531
if(ret == -1){
2532
perror_plus("fchown");
2533
}
2534
}
2535
}
2536
close(pubkey_fd);
2537
}
2538
}
2539
2540
if(dh_params_file != NULL
2541
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2542
int dhparams_fd = open(dh_params_file, O_RDONLY);
2543
if(dhparams_fd == -1){
2544
perror_plus("open");
2545
} else {
2546
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2547
if(ret == -1){
2548
perror_plus("fstat");
2549
} else {
2550
if(S_ISREG(st.st_mode)
2551
and st.st_uid == 0 and st.st_gid == 0){
2552
ret = fchown(dhparams_fd, uid, gid);
2553
if(ret == -1){
2554
perror_plus("fchown");
2555
}
2556
}
2557
}
2558
close(dhparams_fd);
2559
}
2560
}
2561
2562
/* Lower privileges */
2563
ret = lower_privileges();
2564
if(ret != 0){
2565
errno = ret;
2566
perror_plus("Failed to lower privileges");
2567
}
2568
}
2569
}
2570
2571
/* Remove invalid interface names (except "none") */
2572
{
2573
char *interface = NULL;
2574
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2575
interface))){
2576
if(strcmp(interface, "none") != 0
2577
and if_nametoindex(interface) == 0){
2578
if(interface[0] != '\0'){
2579
fprintf_plus(stderr, "Not using nonexisting interface"
2580
" \"%s\"\n", interface);
2581
}
2582
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2583
interface = NULL;
2584
}
2585
}
2586
}
2587
2588
/* Run network hooks */
2589
{
2590
if(mc.interfaces != NULL){
2591
interfaces_hooks = malloc(mc.interfaces_size);
2592
if(interfaces_hooks == NULL){
2593
perror_plus("malloc");
2594
goto end;
2595
}
2596
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2597
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2598
}
2599
run_network_hooks("start", interfaces_hooks != NULL ?
2600
interfaces_hooks : "", delay);
2601
}
2602
2603
1301
if(not debug){
2604
1302
avahi_set_log_function(empty_log);
2605
1303
}
1304
1305
if(interface[0] == '\0'){
1306
struct dirent **direntries;
1307
ret = scandir(sys_class_net, &direntries, good_interface,
1308
alphasort);
1309
if(ret >= 1){
1310
/* Pick the first good interface */
1311
interface = strdup(direntries[0]->d_name);
1312
if(debug){
1313
fprintf(stderr, "Using interface \"%s\"\n", interface);
1314
}
1315
if(interface == NULL){
1316
perror("malloc");
1317
free(direntries);
1318
exitcode = EXIT_FAILURE;
1319
goto end;
1320
}
1321
free(direntries);
1322
} else {
1323
free(direntries);
1324
fprintf(stderr, "Could not find a network interface\n");
1325
exitcode = EXIT_FAILURE;
1326
goto end;
1327
}
1328
}
2606
1329
2607
1330
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2608
1331
from the signal handler */
2609
1332
/* Initialize the pseudo-RNG for Avahi */
2610
1333
srand((unsigned int) time(NULL));
2611
simple_poll = avahi_simple_poll_new();
2612
if(simple_poll == NULL){
2613
fprintf_plus(stderr,
2614
"Avahi: Failed to create simple poll object.\n");
1334
mc.simple_poll = avahi_simple_poll_new();
1335
if(mc.simple_poll == NULL){
1336
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2615
1337
exitcode = EX_UNAVAILABLE;
2616
1338
goto end;
2617
1339
}
2619
1341
sigemptyset(&sigterm_action.sa_mask);
2620
1342
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2621
1343
if(ret == -1){
2622
perror_plus("sigaddset");
1344
perror("sigaddset");
2623
1345
exitcode = EX_OSERR;
2624
1346
goto end;
2625
1347
}
2626
1348
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2627
1349
if(ret == -1){
2628
perror_plus("sigaddset");
1350
perror("sigaddset");
2629
1351
exitcode = EX_OSERR;
2630
1352
goto end;
2631
1353
}
2632
1354
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2633
1355
if(ret == -1){
2634
perror_plus("sigaddset");
1356
perror("sigaddset");
2635
1357
exitcode = EX_OSERR;
2636
1358
goto end;
2637
1359
}
2641
1363
*/
2642
1364
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2643
1365
if(ret == -1){
2644
perror_plus("sigaction");
1366
perror("sigaction");
2645
1367
return EX_OSERR;
2646
1368
}
2647
1369
if(old_sigterm_action.sa_handler != SIG_IGN){
2648
1370
ret = sigaction(SIGINT, &sigterm_action, NULL);
2649
1371
if(ret == -1){
2650
perror_plus("sigaction");
1372
perror("sigaction");
2651
1373
exitcode = EX_OSERR;
2652
1374
goto end;
2653
1375
}
2654
1376
}
2655
1377
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2656
1378
if(ret == -1){
2657
perror_plus("sigaction");
1379
perror("sigaction");
2658
1380
return EX_OSERR;
2659
1381
}
2660
1382
if(old_sigterm_action.sa_handler != SIG_IGN){
2661
1383
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2662
1384
if(ret == -1){
2663
perror_plus("sigaction");
1385
perror("sigaction");
2664
1386
exitcode = EX_OSERR;
2665
1387
goto end;
2666
1388
}
2667
1389
}
2668
1390
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2669
1391
if(ret == -1){
2670
perror_plus("sigaction");
1392
perror("sigaction");
2671
1393
return EX_OSERR;
2672
1394
}
2673
1395
if(old_sigterm_action.sa_handler != SIG_IGN){
2674
1396
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2675
1397
if(ret == -1){
2676
perror_plus("sigaction");
1398
perror("sigaction");
2677
1399
exitcode = EX_OSERR;
2678
1400
goto end;
2679
1401
}
2680
1402
}
2681
1403
2682
/* If no interfaces were specified, make a list */
2683
if(mc.interfaces == NULL){
2684
struct dirent **direntries = NULL;
2685
/* Look for any good interfaces */
2686
ret = scandir(sys_class_net, &direntries, good_interface,
2687
alphasort);
2688
if(ret >= 1){
2689
/* Add all found interfaces to interfaces list */
2690
for(int i = 0; i < ret; ++i){
2691
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2692
direntries[i]->d_name);
2693
if(ret_errno != 0){
2694
errno = ret_errno;
2695
perror_plus("argz_add");
2696
free(direntries[i]);
2697
continue;
2698
}
2699
if(debug){
2700
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2701
direntries[i]->d_name);
2702
}
2703
free(direntries[i]);
2704
}
2705
free(direntries);
1404
/* If the interface is down, bring it up */
1405
if(strcmp(interface, "none") != 0){
1406
if_index = (AvahiIfIndex) if_nametoindex(interface);
1407
if(if_index == 0){
1408
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1409
exitcode = EX_UNAVAILABLE;
1410
goto end;
1411
}
1412
1413
if(quit_now){
1414
goto end;
1415
}
1416
1417
/* Re-raise priviliges */
1418
errno = 0;
1419
ret = seteuid(0);
1420
if(ret == -1){
1421
perror("seteuid");
1422
}
1423
1424
#ifdef __linux__
1425
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1426
messages about the network interface to mess up the prompt */
1427
ret = klogctl(8, NULL, 5);
1428
bool restore_loglevel = true;
1429
if(ret == -1){
1430
restore_loglevel = false;
1431
perror("klogctl");
1432
}
1433
#endif /* __linux__ */
1434
1435
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1436
if(sd < 0){
1437
perror("socket");
1438
exitcode = EX_OSERR;
1439
#ifdef __linux__
1440
if(restore_loglevel){
1441
ret = klogctl(7, NULL, 0);
1442
if(ret == -1){
1443
perror("klogctl");
1444
}
1445
}
1446
#endif /* __linux__ */
1447
/* Lower privileges */
1448
errno = 0;
1449
ret = seteuid(uid);
1450
if(ret == -1){
1451
perror("seteuid");
1452
}
1453
goto end;
1454
}
1455
strcpy(network.ifr_name, interface);
1456
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1457
if(ret == -1){
1458
perror("ioctl SIOCGIFFLAGS");
1459
#ifdef __linux__
1460
if(restore_loglevel){
1461
ret = klogctl(7, NULL, 0);
1462
if(ret == -1){
1463
perror("klogctl");
1464
}
1465
}
1466
#endif /* __linux__ */
1467
exitcode = EX_OSERR;
1468
/* Lower privileges */
1469
errno = 0;
1470
ret = seteuid(uid);
1471
if(ret == -1){
1472
perror("seteuid");
1473
}
1474
goto end;
1475
}
1476
if((network.ifr_flags & IFF_UP) == 0){
1477
network.ifr_flags |= IFF_UP;
1478
take_down_interface = true;
1479
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1480
if(ret == -1){
1481
take_down_interface = false;
1482
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1483
exitcode = EX_OSERR;
1484
#ifdef __linux__
1485
if(restore_loglevel){
1486
ret = klogctl(7, NULL, 0);
1487
if(ret == -1){
1488
perror("klogctl");
1489
}
1490
}
1491
#endif /* __linux__ */
1492
/* Lower privileges */
1493
errno = 0;
1494
ret = seteuid(uid);
1495
if(ret == -1){
1496
perror("seteuid");
1497
}
1498
goto end;
1499
}
1500
}
1501
/* sleep checking until interface is running */
1502
for(int i=0; i < delay * 4; i++){
1503
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1504
if(ret == -1){
1505
perror("ioctl SIOCGIFFLAGS");
1506
} else if(network.ifr_flags & IFF_RUNNING){
1507
break;
1508
}
1509
struct timespec sleeptime = { .tv_nsec = 250000000 };
1510
ret = nanosleep(&sleeptime, NULL);
1511
if(ret == -1 and errno != EINTR){
1512
perror("nanosleep");
1513
}
1514
}
1515
if(not take_down_interface){
1516
/* We won't need the socket anymore */
1517
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1518
if(ret == -1){
1519
perror("close");
1520
}
1521
}
1522
#ifdef __linux__
1523
if(restore_loglevel){
1524
/* Restores kernel loglevel to default */
1525
ret = klogctl(7, NULL, 0);
1526
if(ret == -1){
1527
perror("klogctl");
1528
}
1529
}
1530
#endif /* __linux__ */
1531
/* Lower privileges */
1532
errno = 0;
1533
if(take_down_interface){
1534
/* Lower privileges */
1535
ret = seteuid(uid);
1536
if(ret == -1){
1537
perror("seteuid");
1538
}
2706
1539
} else {
2707
if(ret == 0){
2708
free(direntries);
2709
}
2710
fprintf_plus(stderr, "Could not find a network interface\n");
2711
exitcode = EXIT_FAILURE;
2712
goto end;
2713
}
2714
}
2715
2716
/* Bring up interfaces which are down, and remove any "none"s */
2717
{
2718
char *interface = NULL;
2719
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2720
interface))){
2721
/* If interface name is "none", stop bringing up interfaces.
2722
Also remove all instances of "none" from the list */
2723
if(strcmp(interface, "none") == 0){
2724
argz_delete(&mc.interfaces, &mc.interfaces_size,
2725
interface);
2726
interface = NULL;
2727
while((interface = argz_next(mc.interfaces,
2728
mc.interfaces_size, interface))){
2729
if(strcmp(interface, "none") == 0){
2730
argz_delete(&mc.interfaces, &mc.interfaces_size,
2731
interface);
2732
interface = NULL;
2733
}
2734
}
2735
break;
2736
}
2737
bool interface_was_up = interface_is_up(interface);
2738
errno = bring_up_interface(interface, delay);
2739
if(not interface_was_up){
2740
if(errno != 0){
2741
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2742
" %s\n", interface, strerror(errno));
2743
} else {
2744
errno = argz_add(&interfaces_to_take_down,
2745
&interfaces_to_take_down_size,
2746
interface);
2747
if(errno != 0){
2748
perror_plus("argz_add");
2749
}
2750
}
2751
}
2752
}
2753
if(debug and (interfaces_to_take_down == NULL)){
2754
fprintf_plus(stderr, "No interfaces were brought up\n");
2755
}
2756
}
2757
2758
/* If we only got one interface, explicitly use only that one */
2759
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2760
if(debug){
2761
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2762
mc.interfaces);
2763
}
2764
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1540
/* Lower privileges permanently */
1541
ret = setuid(uid);
1542
if(ret == -1){
1543
perror("setuid");
1544
}
1545
}
2765
1546
}
2766
1547
2767
1548
if(quit_now){
2768
1549
goto end;
2769
1550
}
2770
1551
2771
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1552
ret = init_gnutls_global(pubkey, seckey);
2772
1553
if(ret == -1){
2773
fprintf_plus(stderr, "init_gnutls_global failed\n");
1554
fprintf(stderr, "init_gnutls_global failed\n");
2774
1555
exitcode = EX_UNAVAILABLE;
2775
1556
goto end;
2776
1557
} else {
2781
1562
goto end;
2782
1563
}
2783
1564
2784
/* Try /run/tmp before /tmp */
2785
tempdir = mkdtemp(run_tempdir);
2786
if(tempdir == NULL and errno == ENOENT){
2787
if(debug){
2788
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2789
run_tempdir, old_tempdir);
2790
}
2791
tempdir = mkdtemp(old_tempdir);
2792
}
2793
if(tempdir == NULL){
2794
perror_plus("mkdtemp");
1565
tempdir_created = true;
1566
if(mkdtemp(tempdir) == NULL){
1567
tempdir_created = false;
1568
perror("mkdtemp");
2795
1569
goto end;
2796
1570
}
2797
1571
2799
1573
goto end;
2800
1574
}
2801
1575
2802
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2803
fprintf_plus(stderr, "init_gpgme failed\n");
1576
if(not init_gpgme(pubkey, seckey, tempdir)){
1577
fprintf(stderr, "init_gpgme failed\n");
2804
1578
exitcode = EX_UNAVAILABLE;
2805
1579
goto end;
2806
1580
} else {
2815
1589
/* Connect directly, do not use Zeroconf */
2816
1590
/* (Mainly meant for debugging) */
2817
1591
char *address = strrchr(connect_to, ':');
2818
2819
1592
if(address == NULL){
2820
fprintf_plus(stderr, "No colon in address\n");
1593
fprintf(stderr, "No colon in address\n");
2821
1594
exitcode = EX_USAGE;
2822
1595
goto end;
2823
1596
}
2826
1599
goto end;
2827
1600
}
2828
1601
2829
in_port_t port;
1602
uint16_t port;
2830
1603
errno = 0;
2831
1604
tmpmax = strtoimax(address+1, &tmp, 10);
2832
1605
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2833
or tmpmax != (in_port_t)tmpmax){
2834
fprintf_plus(stderr, "Bad port number\n");
1606
or tmpmax != (uint16_t)tmpmax){
1607
fprintf(stderr, "Bad port number\n");
2835
1608
exitcode = EX_USAGE;
2836
1609
goto end;
2837
1610
}
2838
1611
2839
1612
if(quit_now){
2840
1613
goto end;
2841
1614
}
2842
1615
2843
port = (in_port_t)tmpmax;
1616
port = (uint16_t)tmpmax;
2844
1617
*address = '\0';
1618
address = connect_to;
2845
1619
/* Colon in address indicates IPv6 */
2846
1620
int af;
2847
if(strchr(connect_to, ':') != NULL){
1621
if(strchr(address, ':') != NULL){
2848
1622
af = AF_INET6;
2849
/* Accept [] around IPv6 address - see RFC 5952 */
2850
if(connect_to[0] == '[' and address[-1] == ']')
2851
{
2852
connect_to++;
2853
address[-1] = '\0';
2854
}
2855
1623
} else {
2856
1624
af = AF_INET;
2857
1625
}
2858
address = connect_to;
2859
1626
2860
1627
if(quit_now){
2861
1628
goto end;
2862
1629
}
2863
1630
2864
1631
while(not quit_now){
2865
ret = start_mandos_communication(address, port, if_index, af,
2866
&mc);
1632
ret = start_mandos_communication(address, port, if_index, af);
2867
1633
if(quit_now or ret == 0){
2868
1634
break;
2869
1635
}
2870
if(debug){
2871
fprintf_plus(stderr, "Retrying in %d seconds\n",
2872
(int)retry_interval);
2873
}
2874
sleep((unsigned int)retry_interval);
2875
}
2876
2877
if(not quit_now){
1636
sleep(15);
1637
};
1638
1639
if (not quit_now){
2878
1640
exitcode = EXIT_SUCCESS;
2879
1641
}
2880
1642
2881
1643
goto end;
2882
1644
}
2883
1645
2895
1657
config.publish_domain = 0;
2896
1658
2897
1659
/* Allocate a new server */
2898
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2899
&config, NULL, NULL, &ret);
1660
mc.server = avahi_server_new(avahi_simple_poll_get
1661
(mc.simple_poll), &config, NULL,
1662
NULL, &error);
2900
1663
2901
1664
/* Free the Avahi configuration data */
2902
1665
avahi_server_config_free(&config);
2904
1667
2905
1668
/* Check if creating the Avahi server object succeeded */
2906
1669
if(mc.server == NULL){
2907
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2908
avahi_strerror(ret));
1670
fprintf(stderr, "Failed to create Avahi server: %s\n",
1671
avahi_strerror(error));
2909
1672
exitcode = EX_UNAVAILABLE;
2910
1673
goto end;
2911
1674
}
2917
1680
/* Create the Avahi service browser */
2918
1681
sb = avahi_s_service_browser_new(mc.server, if_index,
2919
1682
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2920
NULL, 0, browse_callback,
2921
(void *)&mc);
1683
NULL, 0, browse_callback, NULL);
2922
1684
if(sb == NULL){
2923
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2924
avahi_strerror(avahi_server_errno(mc.server)));
1685
fprintf(stderr, "Failed to create service browser: %s\n",
1686
avahi_strerror(avahi_server_errno(mc.server)));
2925
1687
exitcode = EX_UNAVAILABLE;
2926
1688
goto end;
2927
1689
}
2933
1695
/* Run the main loop */
2934
1696
2935
1697
if(debug){
2936
fprintf_plus(stderr, "Starting Avahi loop search\n");
1698
fprintf(stderr, "Starting Avahi loop search\n");
2937
1699
}
2938
1700
2939
ret = avahi_loop_with_timeout(simple_poll,
2940
(int)(retry_interval * 1000), &mc);
2941
if(debug){
2942
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2943
(ret == 0) ? "successfully" : "with error");
2944
}
1701
avahi_simple_poll_loop(mc.simple_poll);
2945
1702
2946
1703
end:
2947
1704
2948
1705
if(debug){
2949
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1706
fprintf(stderr, "%s exiting\n", argv[0]);
2950
1707
}
2951
1708
2952
1709
/* Cleanup things */
2953
free(mc.interfaces);
2954
2955
1710
if(sb != NULL)
2956
1711
avahi_s_service_browser_free(sb);
2957
1712
2958
1713
if(mc.server != NULL)
2959
1714
avahi_server_free(mc.server);
2960
1715
2961
if(simple_poll != NULL)
2962
avahi_simple_poll_free(simple_poll);
1716
if(mc.simple_poll != NULL)
1717
avahi_simple_poll_free(mc.simple_poll);
2963
1718
2964
1719
if(gnutls_initialized){
2965
1720
gnutls_certificate_free_credentials(mc.cred);
1721
gnutls_global_deinit();
2966
1722
gnutls_dh_params_deinit(mc.dh_params);
2967
1723
}
2968
1724
2970
1726
gpgme_release(mc.ctx);
2971
1727
}
2972
1728
2973
/* Cleans up the circular linked list of Mandos servers the client
2974
has seen */
2975
if(mc.current_server != NULL){
2976
mc.current_server->prev->next = NULL;
2977
while(mc.current_server != NULL){
2978
server *next = mc.current_server->next;
2979
#ifdef __GNUC__
2980
#pragma GCC diagnostic push
2981
#pragma GCC diagnostic ignored "-Wcast-qual"
2982
#endif
2983
free((char *)(mc.current_server->ip));
2984
#ifdef __GNUC__
2985
#pragma GCC diagnostic pop
2986
#endif
2987
free(mc.current_server);
2988
mc.current_server = next;
2989
}
2990
}
2991
2992
/* Re-raise privileges */
2993
{
2994
ret = raise_privileges();
2995
if(ret != 0){
2996
errno = ret;
2997
perror_plus("Failed to raise privileges");
2998
} else {
2999
3000
/* Run network hooks */
3001
run_network_hooks("stop", interfaces_hooks != NULL ?
3002
interfaces_hooks : "", delay);
3003
3004
/* Take down the network interfaces which were brought up */
3005
{
3006
char *interface = NULL;
3007
while((interface=argz_next(interfaces_to_take_down,
3008
interfaces_to_take_down_size,
3009
interface))){
3010
ret = take_down_interface(interface);
3011
if(ret != 0){
3012
errno = ret;
3013
perror_plus("Failed to take down interface");
3014
}
3015
}
3016
if(debug and (interfaces_to_take_down == NULL)){
3017
fprintf_plus(stderr, "No interfaces needed to be taken"
3018
" down\n");
3019
}
3020
}
3021
}
3022
3023
ret = lower_privileges_permanently();
3024
if(ret != 0){
3025
errno = ret;
3026
perror_plus("Failed to lower privileges permanently");
3027
}
3028
}
3029
3030
free(interfaces_to_take_down);
3031
free(interfaces_hooks);
3032
3033
void clean_dir_at(int base, const char * const dirname,
3034
uintmax_t level){
3035
struct dirent **direntries = NULL;
3036
int dret;
3037
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3038
O_RDONLY
3039
| O_NOFOLLOW
3040
| O_DIRECTORY
3041
| O_PATH));
3042
if(dir_fd == -1){
3043
perror_plus("open");
3044
}
3045
int numentries = scandirat(dir_fd, ".", &direntries,
3046
notdotentries, alphasort);
3047
if(numentries >= 0){
3048
for(int i = 0; i < numentries; i++){
3049
if(debug){
3050
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3051
dirname, direntries[i]->d_name);
3052
}
3053
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3054
if(dret == -1){
3055
if(errno == EISDIR){
3056
dret = unlinkat(dir_fd, direntries[i]->d_name,
3057
AT_REMOVEDIR);
3058
}
3059
if((dret == -1) and (errno == ENOTEMPTY)
3060
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3061
== 0) and (level == 0)){
3062
/* Recurse only in this special case */
3063
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3064
dret = 0;
3065
}
3066
if(dret == -1){
3067
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3068
direntries[i]->d_name, strerror(errno));
3069
}
3070
}
3071
free(direntries[i]);
3072
}
3073
3074
/* need to clean even if 0 because man page doesn't specify */
3075
free(direntries);
3076
if(numentries == -1){
3077
perror_plus("scandirat");
3078
}
3079
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3080
if(dret == -1 and errno != ENOENT){
3081
perror_plus("rmdir");
3082
}
3083
} else {
3084
perror_plus("scandirat");
3085
}
3086
close(dir_fd);
3087
}
3088
3089
/* Removes the GPGME temp directory and all files inside */
3090
if(tempdir != NULL){
3091
clean_dir_at(-1, tempdir, 0);
1729
/* Take down the network interface */
1730
if(take_down_interface){
1731
/* Re-raise priviliges */
1732
errno = 0;
1733
ret = seteuid(0);
1734
if(ret == -1){
1735
perror("seteuid");
1736
}
1737
if(geteuid() == 0){
1738
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1739
if(ret == -1){
1740
perror("ioctl SIOCGIFFLAGS");
1741
} else if(network.ifr_flags & IFF_UP) {
1742
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1743
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1744
if(ret == -1){
1745
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1746
}
1747
}
1748
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1749
if(ret == -1){
1750
perror("close");
1751
}
1752
/* Lower privileges permanently */
1753
errno = 0;
1754
ret = setuid(uid);
1755
if(ret == -1){
1756
perror("setuid");
1757
}
1758
}
1759
}
1760
1761
/* Removes the temp directory used by GPGME */
1762
if(tempdir_created){
1763
DIR *d;
1764
struct dirent *direntry;
1765
d = opendir(tempdir);
1766
if(d == NULL){
1767
if(errno != ENOENT){
1768
perror("opendir");
1769
}
1770
} else {
1771
while(true){
1772
direntry = readdir(d);
1773
if(direntry == NULL){
1774
break;
1775
}
1776
/* Skip "." and ".." */
1777
if(direntry->d_name[0] == '.'
1778
and (direntry->d_name[1] == '\0'
1779
or (direntry->d_name[1] == '.'
1780
and direntry->d_name[2] == '\0'))){
1781
continue;
1782
}
1783
char *fullname = NULL;
1784
ret = asprintf(&fullname, "%s/%s", tempdir,
1785
direntry->d_name);
1786
if(ret < 0){
1787
perror("asprintf");
1788
continue;
1789
}
1790
ret = remove(fullname);
1791
if(ret == -1){
1792
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1793
strerror(errno));
1794
}
1795
free(fullname);
1796
}
1797
closedir(d);
1798
}
1799
ret = rmdir(tempdir);
1800
if(ret == -1 and errno != ENOENT){
1801
perror("rmdir");
1802
}
3092
1803
}
3093
1804
3094
1805
if(quit_now){
3098
1809
&old_sigterm_action,
3099
1810
NULL));
3100
1811
if(ret == -1){
3101
perror_plus("sigaction");
1812
perror("sigaction");
3102
1813
}
3103
1814
do {
3104
1815
ret = raise(signal_received);
3105
1816
} while(ret != 0 and errno == EINTR);
3106
1817
if(ret != 0){
3107
perror_plus("raise");
1818
perror("raise");
3108
1819
abort();
3109
1820
}
3110
1821
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0