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- Committer: Teddy Hogeborn
- Date: 2017-08-20 14:41:20 UTC
- Revision ID: teddy@recompile.se-20170820144120-ee0hsyhvo1geg8ms
Handle multiple lines better in cryptroot file.
* initramfs-tools-script: Avoid running plugin-runner more than once
if the root file system device is specially marked in the cryptroot
file. Also never run plugin-runner for a resume (usually swap)
device.
* initramfs-tools-script: Avoid running plugin-runner more than once
if the root file system device is specially marked in the cryptroot
file. Also never run plugin-runner for a resume (usually swap)
device.
- files added:
- bugs.xml
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008-2017 Teddy Hogeborn
13
* Copyright © 2008-2017 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy(), strsignal()
51
*/
51
52
#include <sys/ioctl.h> /* ioctl */
52
53
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
54
sockaddr_in6, PF_INET6,
54
55
SOCK_STREAM, uid_t, gid_t, open(),
55
56
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
57
#include <sys/stat.h> /* open(), S_ISREG */
57
58
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
59
inet_pton(), connect(),
60
getnameinfo() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
62
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
63
*/
62
64
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
65
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
66
71
program_invocation_short_name */
67
72
#include <time.h> /* nanosleep(), time(), sleep() */
68
73
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
73
78
*/
74
79
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
80
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
81
setgid(), pause(), _exit(),
82
unlinkat() */
83
#include <arpa/inet.h> /* inet_pton(), htons() */
78
84
#include <iso646.h> /* not, or, and */
79
85
#include <argp.h> /* struct argp_option, error_t, struct
80
86
argp_state, struct argp,
85
91
raise() */
86
92
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
93
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
94
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
95
WEXITSTATUS(), WTERMSIG() */
96
#include <grp.h> /* setgroups() */
97
#include <argz.h> /* argz_add_sep(), argz_next(),
98
argz_delete(), argz_append(),
99
argz_stringify(), argz_add(),
100
argz_count() */
101
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
102
EAI_SYSTEM, gai_strerror() */
88
103
89
104
#ifdef __linux__
90
105
#include <sys/klog.h> /* klogctl() */
108
123
init_gnutls_session(),
109
124
GNUTLS_* */
110
125
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
126
/* gnutls_certificate_set_openpgp_key_file(),
127
GNUTLS_OPENPGP_FMT_BASE64 */
113
128
114
129
/* GPGME */
115
130
#include <gpgme.h> /* All GPGME types, constants and
131
146
const char *argp_program_bug_address = "<mandos@recompile.se>";
132
147
static const char sys_class_net[] = "/sys/class/net";
133
148
char *connect_to = NULL;
149
const char *hookdir = HOOKDIR;
150
int hookdir_fd = -1;
151
uid_t uid = 65534;
152
gid_t gid = 65534;
134
153
135
154
/* Doubly linked list that need to be circularly linked when used */
136
155
typedef struct server{
137
156
const char *ip;
138
uint16_t port;
157
in_port_t port;
139
158
AvahiIfIndex if_index;
140
159
int af;
141
160
struct timespec last_seen;
145
164
146
165
/* Used for passing in values through the Avahi callback functions */
147
166
typedef struct {
148
AvahiSimplePoll *simple_poll;
149
167
AvahiServer *server;
150
168
gnutls_certificate_credentials_t cred;
151
169
unsigned int dh_bits;
153
171
const char *priority;
154
172
gpgme_ctx_t ctx;
155
173
server *current_server;
174
char *interfaces;
175
size_t interfaces_size;
156
176
} mandos_context;
157
177
158
/* global context so signal handler can reach it*/
159
mandos_context mc = { .simple_poll = NULL, .server = NULL,
160
.dh_bits = 1024, .priority = "SECURE256"
161
":!CTYPE-X.509:+CTYPE-OPENPGP",
162
.current_server = NULL };
178
/* global so signal handler can reach it*/
179
AvahiSimplePoll *simple_poll;
163
180
164
181
sig_atomic_t quit_now = 0;
165
182
int signal_received = 0;
166
183
167
184
/* Function to use when printing errors */
168
185
void perror_plus(const char *print_text){
186
int e = errno;
169
187
fprintf(stderr, "Mandos plugin %s: ",
170
188
program_invocation_short_name);
189
errno = e;
171
190
perror(print_text);
172
191
}
173
192
193
__attribute__((format (gnu_printf, 2, 3), nonnull))
174
194
int fprintf_plus(FILE *stream, const char *format, ...){
175
195
va_list ap;
176
196
va_start (ap, format);
177
197
178
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
179
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
198
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
199
program_invocation_short_name));
200
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
180
201
}
181
202
182
203
/*
184
205
* bytes. "buffer_capacity" is how much is currently allocated,
185
206
* "buffer_length" is how much is already used.
186
207
*/
208
__attribute__((nonnull, warn_unused_result))
187
209
size_t incbuffer(char **buffer, size_t buffer_length,
188
size_t buffer_capacity){
210
size_t buffer_capacity){
189
211
if(buffer_length + BUFFER_SIZE > buffer_capacity){
190
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
191
if(buffer == NULL){
212
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
if(new_buf == NULL){
214
int old_errno = errno;
215
free(*buffer);
216
errno = old_errno;
217
*buffer = NULL;
192
218
return 0;
193
219
}
220
*buffer = new_buf;
194
221
buffer_capacity += BUFFER_SIZE;
195
222
}
196
223
return buffer_capacity;
197
224
}
198
225
199
226
/* Add server to set of servers to retry periodically */
200
int add_server(const char *ip, uint16_t port,
201
AvahiIfIndex if_index,
202
int af){
227
__attribute__((nonnull, warn_unused_result))
228
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
229
int af, server **current_server){
203
230
int ret;
204
231
server *new_server = malloc(sizeof(server));
205
232
if(new_server == NULL){
206
233
perror_plus("malloc");
207
return -1;
234
return false;
208
235
}
209
236
*new_server = (server){ .ip = strdup(ip),
210
.port = port,
211
.if_index = if_index,
212
.af = af };
237
.port = port,
238
.if_index = if_index,
239
.af = af };
213
240
if(new_server->ip == NULL){
214
241
perror_plus("strdup");
215
return -1;
242
free(new_server);
243
return false;
244
}
245
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
246
if(ret == -1){
247
perror_plus("clock_gettime");
248
#ifdef __GNUC__
249
#pragma GCC diagnostic push
250
#pragma GCC diagnostic ignored "-Wcast-qual"
251
#endif
252
free((char *)(new_server->ip));
253
#ifdef __GNUC__
254
#pragma GCC diagnostic pop
255
#endif
256
free(new_server);
257
return false;
216
258
}
217
259
/* Special case of first server */
218
if (mc.current_server == NULL){
260
if(*current_server == NULL){
219
261
new_server->next = new_server;
220
262
new_server->prev = new_server;
221
mc.current_server = new_server;
222
/* Place the new server last in the list */
263
*current_server = new_server;
223
264
} else {
224
new_server->next = mc.current_server;
225
new_server->prev = mc.current_server->prev;
265
/* Place the new server last in the list */
266
new_server->next = *current_server;
267
new_server->prev = (*current_server)->prev;
226
268
new_server->prev->next = new_server;
227
mc.current_server->prev = new_server;
228
}
229
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
230
if(ret == -1){
231
perror_plus("clock_gettime");
232
return -1;
233
}
234
return 0;
269
(*current_server)->prev = new_server;
270
}
271
return true;
235
272
}
236
273
237
274
/*
238
275
* Initialize GPGME.
239
276
*/
240
static bool init_gpgme(const char *seckey,
241
const char *pubkey, const char *tempdir){
277
__attribute__((nonnull, warn_unused_result))
278
static bool init_gpgme(const char * const seckey,
279
const char * const pubkey,
280
const char * const tempdir,
281
mandos_context *mc){
242
282
gpgme_error_t rc;
243
283
gpgme_engine_info_t engine_info;
244
284
245
246
285
/*
247
286
* Helper function to insert pub and seckey to the engine keyring.
248
287
*/
249
bool import_key(const char *filename){
288
bool import_key(const char * const filename){
250
289
int ret;
251
290
int fd;
252
291
gpgme_data_t pgp_data;
259
298
260
299
rc = gpgme_data_new_from_fd(&pgp_data, fd);
261
300
if(rc != GPG_ERR_NO_ERROR){
262
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
263
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
264
303
return false;
265
304
}
266
305
267
rc = gpgme_op_import(mc.ctx, pgp_data);
306
rc = gpgme_op_import(mc->ctx, pgp_data);
268
307
if(rc != GPG_ERR_NO_ERROR){
269
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
308
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
271
310
return false;
272
311
}
273
312
274
ret = (int)TEMP_FAILURE_RETRY(close(fd));
313
ret = close(fd);
275
314
if(ret == -1){
276
315
perror_plus("close");
277
316
}
280
319
}
281
320
282
321
if(debug){
283
fprintf(stderr, "Initializing GPGME\n");
322
fprintf_plus(stderr, "Initializing GPGME\n");
284
323
}
285
324
286
325
/* Init GPGME */
287
326
gpgme_check_version(NULL);
288
327
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
289
328
if(rc != GPG_ERR_NO_ERROR){
290
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
329
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
330
gpgme_strsource(rc), gpgme_strerror(rc));
292
331
return false;
293
332
}
294
333
295
334
/* Set GPGME home directory for the OpenPGP engine only */
296
335
rc = gpgme_get_engine_info(&engine_info);
297
336
if(rc != GPG_ERR_NO_ERROR){
298
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
299
gpgme_strsource(rc), gpgme_strerror(rc));
337
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
338
gpgme_strsource(rc), gpgme_strerror(rc));
300
339
return false;
301
340
}
302
341
while(engine_info != NULL){
308
347
engine_info = engine_info->next;
309
348
}
310
349
if(engine_info == NULL){
311
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
350
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
351
tempdir);
312
352
return false;
313
353
}
314
354
315
355
/* Create new GPGME "context" */
316
rc = gpgme_new(&(mc.ctx));
356
rc = gpgme_new(&(mc->ctx));
317
357
if(rc != GPG_ERR_NO_ERROR){
318
fprintf(stderr, "bad gpgme_new: %s: %s\n",
319
gpgme_strsource(rc), gpgme_strerror(rc));
358
fprintf_plus(stderr, "Mandos plugin mandos-client: "
359
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
360
gpgme_strerror(rc));
320
361
return false;
321
362
}
322
363
331
372
* Decrypt OpenPGP data.
332
373
* Returns -1 on error
333
374
*/
375
__attribute__((nonnull, warn_unused_result))
334
376
static ssize_t pgp_packet_decrypt(const char *cryptotext,
335
377
size_t crypto_size,
336
char **plaintext){
378
char **plaintext,
379
mandos_context *mc){
337
380
gpgme_data_t dh_crypto, dh_plain;
338
381
gpgme_error_t rc;
339
382
ssize_t ret;
341
384
ssize_t plaintext_length = 0;
342
385
343
386
if(debug){
344
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
387
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
345
388
}
346
389
347
390
/* Create new GPGME data buffer from memory cryptotext */
348
391
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
349
392
0);
350
393
if(rc != GPG_ERR_NO_ERROR){
351
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
352
gpgme_strsource(rc), gpgme_strerror(rc));
394
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
395
gpgme_strsource(rc), gpgme_strerror(rc));
353
396
return -1;
354
397
}
355
398
356
399
/* Create new empty GPGME data buffer for the plaintext */
357
400
rc = gpgme_data_new(&dh_plain);
358
401
if(rc != GPG_ERR_NO_ERROR){
359
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
402
fprintf_plus(stderr, "Mandos plugin mandos-client: "
403
"bad gpgme_data_new: %s: %s\n",
404
gpgme_strsource(rc), gpgme_strerror(rc));
361
405
gpgme_data_release(dh_crypto);
362
406
return -1;
363
407
}
364
408
365
409
/* Decrypt data from the cryptotext data buffer to the plaintext
366
410
data buffer */
367
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
411
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
368
412
if(rc != GPG_ERR_NO_ERROR){
369
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
413
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
414
gpgme_strsource(rc), gpgme_strerror(rc));
371
415
plaintext_length = -1;
372
416
if(debug){
373
417
gpgme_decrypt_result_t result;
374
result = gpgme_op_decrypt_result(mc.ctx);
418
result = gpgme_op_decrypt_result(mc->ctx);
375
419
if(result == NULL){
376
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
420
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
377
421
} else {
378
fprintf(stderr, "Unsupported algorithm: %s\n",
379
result->unsupported_algorithm);
380
fprintf(stderr, "Wrong key usage: %u\n",
381
result->wrong_key_usage);
422
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
423
result->unsupported_algorithm);
424
fprintf_plus(stderr, "Wrong key usage: %u\n",
425
result->wrong_key_usage);
382
426
if(result->file_name != NULL){
383
fprintf(stderr, "File name: %s\n", result->file_name);
427
fprintf_plus(stderr, "File name: %s\n", result->file_name);
384
428
}
385
429
gpgme_recipient_t recipient;
386
430
recipient = result->recipients;
387
431
while(recipient != NULL){
388
fprintf(stderr, "Public key algorithm: %s\n",
389
gpgme_pubkey_algo_name(recipient->pubkey_algo));
390
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
391
fprintf(stderr, "Secret key available: %s\n",
392
recipient->status == GPG_ERR_NO_SECKEY
393
? "No" : "Yes");
432
fprintf_plus(stderr, "Public key algorithm: %s\n",
433
gpgme_pubkey_algo_name
434
(recipient->pubkey_algo));
435
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
436
fprintf_plus(stderr, "Secret key available: %s\n",
437
recipient->status == GPG_ERR_NO_SECKEY
438
? "No" : "Yes");
394
439
recipient = recipient->next;
395
440
}
396
441
}
399
444
}
400
445
401
446
if(debug){
402
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
447
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
403
448
}
404
449
405
450
/* Seek back to the beginning of the GPGME plaintext data buffer */
412
457
*plaintext = NULL;
413
458
while(true){
414
459
plaintext_capacity = incbuffer(plaintext,
415
(size_t)plaintext_length,
416
plaintext_capacity);
460
(size_t)plaintext_length,
461
plaintext_capacity);
417
462
if(plaintext_capacity == 0){
418
perror_plus("incbuffer");
419
plaintext_length = -1;
420
goto decrypt_end;
463
perror_plus("incbuffer");
464
plaintext_length = -1;
465
goto decrypt_end;
421
466
}
422
467
423
468
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
436
481
}
437
482
438
483
if(debug){
439
fprintf(stderr, "Decrypted password is: ");
484
fprintf_plus(stderr, "Decrypted password is: ");
440
485
for(ssize_t i = 0; i < plaintext_length; i++){
441
486
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
442
487
}
453
498
return plaintext_length;
454
499
}
455
500
456
static const char * safer_gnutls_strerror(int value){
457
const char *ret = gnutls_strerror(value); /* Spurious warning from
458
-Wunreachable-code */
459
if(ret == NULL)
460
ret = "(unknown)";
461
return ret;
501
__attribute__((warn_unused_result, const))
502
static const char *safe_string(const char *str){
503
if(str == NULL)
504
return "(unknown)";
505
return str;
506
}
507
508
__attribute__((warn_unused_result))
509
static const char *safer_gnutls_strerror(int value){
510
const char *ret = gnutls_strerror(value);
511
return safe_string(ret);
462
512
}
463
513
464
514
/* GnuTLS log function callback */
515
__attribute__((nonnull))
465
516
static void debuggnutls(__attribute__((unused)) int level,
466
517
const char* string){
467
fprintf(stderr, "GnuTLS: %s", string);
518
fprintf_plus(stderr, "GnuTLS: %s", string);
468
519
}
469
520
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
470
522
static int init_gnutls_global(const char *pubkeyfilename,
471
const char *seckeyfilename){
523
const char *seckeyfilename,
524
const char *dhparamsfilename,
525
mandos_context *mc){
472
526
int ret;
527
unsigned int uret;
473
528
474
529
if(debug){
475
fprintf(stderr, "Initializing GnuTLS\n");
476
}
477
478
ret = gnutls_global_init();
479
if(ret != GNUTLS_E_SUCCESS){
480
fprintf(stderr, "GnuTLS global_init: %s\n",
481
safer_gnutls_strerror(ret));
482
return -1;
530
fprintf_plus(stderr, "Initializing GnuTLS\n");
483
531
}
484
532
485
533
if(debug){
491
539
}
492
540
493
541
/* OpenPGP credentials */
494
ret = gnutls_certificate_allocate_credentials(&mc.cred);
542
ret = gnutls_certificate_allocate_credentials(&mc->cred);
495
543
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "GnuTLS memory error: %s\n",
497
safer_gnutls_strerror(ret));
498
gnutls_global_deinit();
544
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
safer_gnutls_strerror(ret));
499
546
return -1;
500
547
}
501
548
502
549
if(debug){
503
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
504
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
505
seckeyfilename);
550
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
551
" secret key %s as GnuTLS credentials\n",
552
pubkeyfilename,
553
seckeyfilename);
506
554
}
507
555
508
556
ret = gnutls_certificate_set_openpgp_key_file
509
(mc.cred, pubkeyfilename, seckeyfilename,
557
(mc->cred, pubkeyfilename, seckeyfilename,
510
558
GNUTLS_OPENPGP_FMT_BASE64);
511
559
if(ret != GNUTLS_E_SUCCESS){
512
fprintf(stderr,
513
"Error[%d] while reading the OpenPGP key pair ('%s',"
514
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
515
fprintf(stderr, "The GnuTLS error is: %s\n",
516
safer_gnutls_strerror(ret));
560
fprintf_plus(stderr,
561
"Error[%d] while reading the OpenPGP key pair ('%s',"
562
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
563
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
564
safer_gnutls_strerror(ret));
517
565
goto globalfail;
518
566
}
519
567
520
568
/* GnuTLS server initialization */
521
ret = gnutls_dh_params_init(&mc.dh_params);
522
if(ret != GNUTLS_E_SUCCESS){
523
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
524
" %s\n", safer_gnutls_strerror(ret));
525
goto globalfail;
526
}
527
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
528
if(ret != GNUTLS_E_SUCCESS){
529
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
530
safer_gnutls_strerror(ret));
531
goto globalfail;
532
}
533
534
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
569
ret = gnutls_dh_params_init(&mc->dh_params);
570
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
572
" initialization: %s\n",
573
safer_gnutls_strerror(ret));
574
goto globalfail;
575
}
576
/* If a Diffie-Hellman parameters file was given, try to use it */
577
if(dhparamsfilename != NULL){
578
gnutls_datum_t params = { .data = NULL, .size = 0 };
579
do {
580
int dhpfile = open(dhparamsfilename, O_RDONLY);
581
if(dhpfile == -1){
582
perror_plus("open");
583
dhparamsfilename = NULL;
584
break;
585
}
586
size_t params_capacity = 0;
587
while(true){
588
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params.size,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
592
perror_plus("incbuffer");
593
free(params.data);
594
params.data = NULL;
595
dhparamsfilename = NULL;
596
break;
597
}
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
600
BUFFER_SIZE);
601
/* EOF */
602
if(bytes_read == 0){
603
break;
604
}
605
/* check bytes_read for failure */
606
if(bytes_read < 0){
607
perror_plus("read");
608
free(params.data);
609
params.data = NULL;
610
dhparamsfilename = NULL;
611
break;
612
}
613
params.size += (unsigned int)bytes_read;
614
}
615
if(params.data == NULL){
616
dhparamsfilename = NULL;
617
}
618
if(dhparamsfilename == NULL){
619
break;
620
}
621
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
622
GNUTLS_X509_FMT_PEM);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Failed to parse DH parameters in file"
625
" \"%s\": %s\n", dhparamsfilename,
626
safer_gnutls_strerror(ret));
627
dhparamsfilename = NULL;
628
}
629
free(params.data);
630
} while(false);
631
}
632
if(dhparamsfilename == NULL){
633
if(mc->dh_bits == 0){
634
/* Find out the optimal number of DH bits */
635
/* Try to read the private key file */
636
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
637
do {
638
int secfile = open(seckeyfilename, O_RDONLY);
639
if(secfile == -1){
640
perror_plus("open");
641
break;
642
}
643
size_t buffer_capacity = 0;
644
while(true){
645
buffer_capacity = incbuffer((char **)&buffer.data,
646
(size_t)buffer.size,
647
(size_t)buffer_capacity);
648
if(buffer_capacity == 0){
649
perror_plus("incbuffer");
650
free(buffer.data);
651
buffer.data = NULL;
652
break;
653
}
654
ssize_t bytes_read = read(secfile,
655
buffer.data + buffer.size,
656
BUFFER_SIZE);
657
/* EOF */
658
if(bytes_read == 0){
659
break;
660
}
661
/* check bytes_read for failure */
662
if(bytes_read < 0){
663
perror_plus("read");
664
free(buffer.data);
665
buffer.data = NULL;
666
break;
667
}
668
buffer.size += (unsigned int)bytes_read;
669
}
670
close(secfile);
671
} while(false);
672
/* If successful, use buffer to parse private key */
673
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
674
if(buffer.data != NULL){
675
{
676
gnutls_openpgp_privkey_t privkey = NULL;
677
ret = gnutls_openpgp_privkey_init(&privkey);
678
if(ret != GNUTLS_E_SUCCESS){
679
fprintf_plus(stderr, "Error initializing OpenPGP key"
680
" structure: %s",
681
safer_gnutls_strerror(ret));
682
free(buffer.data);
683
buffer.data = NULL;
684
} else {
685
ret = gnutls_openpgp_privkey_import
686
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
687
if(ret != GNUTLS_E_SUCCESS){
688
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
689
safer_gnutls_strerror(ret));
690
privkey = NULL;
691
}
692
free(buffer.data);
693
buffer.data = NULL;
694
if(privkey != NULL){
695
/* Use private key to suggest an appropriate
696
sec_param */
697
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
698
gnutls_openpgp_privkey_deinit(privkey);
699
if(debug){
700
fprintf_plus(stderr, "This OpenPGP key implies using"
701
" a GnuTLS security parameter \"%s\".\n",
702
safe_string(gnutls_sec_param_get_name
703
(sec_param)));
704
}
705
}
706
}
707
}
708
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
709
/* Err on the side of caution */
710
sec_param = GNUTLS_SEC_PARAM_ULTRA;
711
if(debug){
712
fprintf_plus(stderr, "Falling back to security parameter"
713
" \"%s\"\n",
714
safe_string(gnutls_sec_param_get_name
715
(sec_param)));
716
}
717
}
718
}
719
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
720
if(uret != 0){
721
mc->dh_bits = uret;
722
if(debug){
723
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
724
" implies %u DH bits; using that.\n",
725
safe_string(gnutls_sec_param_get_name
726
(sec_param)),
727
mc->dh_bits);
728
}
729
} else {
730
fprintf_plus(stderr, "Failed to get implied number of DH"
731
" bits for security parameter \"%s\"): %s\n",
732
safe_string(gnutls_sec_param_get_name
733
(sec_param)),
734
safer_gnutls_strerror(ret));
735
goto globalfail;
736
}
737
} else if(debug){
738
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
739
mc->dh_bits);
740
}
741
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
742
if(ret != GNUTLS_E_SUCCESS){
743
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
744
" bits): %s\n", mc->dh_bits,
745
safer_gnutls_strerror(ret));
746
goto globalfail;
747
}
748
}
749
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
535
750
536
751
return 0;
537
752
538
753
globalfail:
539
754
540
gnutls_certificate_free_credentials(mc.cred);
541
gnutls_global_deinit();
542
gnutls_dh_params_deinit(mc.dh_params);
755
gnutls_certificate_free_credentials(mc->cred);
756
gnutls_dh_params_deinit(mc->dh_params);
543
757
return -1;
544
758
}
545
759
546
static int init_gnutls_session(gnutls_session_t *session){
760
__attribute__((nonnull, warn_unused_result))
761
static int init_gnutls_session(gnutls_session_t *session,
762
mandos_context *mc){
547
763
int ret;
548
764
/* GnuTLS session creation */
549
765
do {
553
769
}
554
770
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
555
771
if(ret != GNUTLS_E_SUCCESS){
556
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
557
safer_gnutls_strerror(ret));
772
fprintf_plus(stderr,
773
"Error in GnuTLS session initialization: %s\n",
774
safer_gnutls_strerror(ret));
558
775
}
559
776
560
777
{
561
778
const char *err;
562
779
do {
563
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
780
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
564
781
if(quit_now){
565
782
gnutls_deinit(*session);
566
783
return -1;
567
784
}
568
785
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
569
786
if(ret != GNUTLS_E_SUCCESS){
570
fprintf(stderr, "Syntax error at: %s\n", err);
571
fprintf(stderr, "GnuTLS error: %s\n",
572
safer_gnutls_strerror(ret));
787
fprintf_plus(stderr, "Syntax error at: %s\n", err);
788
fprintf_plus(stderr, "GnuTLS error: %s\n",
789
safer_gnutls_strerror(ret));
573
790
gnutls_deinit(*session);
574
791
return -1;
575
792
}
577
794
578
795
do {
579
796
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
580
mc.cred);
797
mc->cred);
581
798
if(quit_now){
582
799
gnutls_deinit(*session);
583
800
return -1;
584
801
}
585
802
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
586
803
if(ret != GNUTLS_E_SUCCESS){
587
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
588
safer_gnutls_strerror(ret));
804
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
805
safer_gnutls_strerror(ret));
589
806
gnutls_deinit(*session);
590
807
return -1;
591
808
}
593
810
/* ignore client certificate if any. */
594
811
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
595
812
596
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
597
598
813
return 0;
599
814
}
600
815
602
817
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
603
818
__attribute__((unused)) const char *txt){}
604
819
820
/* Set effective uid to 0, return errno */
821
__attribute__((warn_unused_result))
822
int raise_privileges(void){
823
int old_errno = errno;
824
int ret = 0;
825
if(seteuid(0) == -1){
826
ret = errno;
827
}
828
errno = old_errno;
829
return ret;
830
}
831
832
/* Set effective and real user ID to 0. Return errno. */
833
__attribute__((warn_unused_result))
834
int raise_privileges_permanently(void){
835
int old_errno = errno;
836
int ret = raise_privileges();
837
if(ret != 0){
838
errno = old_errno;
839
return ret;
840
}
841
if(setuid(0) == -1){
842
ret = errno;
843
}
844
errno = old_errno;
845
return ret;
846
}
847
848
/* Set effective user ID to unprivileged saved user ID */
849
__attribute__((warn_unused_result))
850
int lower_privileges(void){
851
int old_errno = errno;
852
int ret = 0;
853
if(seteuid(uid) == -1){
854
ret = errno;
855
}
856
errno = old_errno;
857
return ret;
858
}
859
860
/* Lower privileges permanently */
861
__attribute__((warn_unused_result))
862
int lower_privileges_permanently(void){
863
int old_errno = errno;
864
int ret = 0;
865
if(setuid(uid) == -1){
866
ret = errno;
867
}
868
errno = old_errno;
869
return ret;
870
}
871
872
/* Helper function to add_local_route() and delete_local_route() */
873
__attribute__((nonnull, warn_unused_result))
874
static bool add_delete_local_route(const bool add,
875
const char *address,
876
AvahiIfIndex if_index){
877
int ret;
878
char helper[] = "mandos-client-iprouteadddel";
879
char add_arg[] = "add";
880
char delete_arg[] = "delete";
881
char debug_flag[] = "--debug";
882
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
883
if(pluginhelperdir == NULL){
884
if(debug){
885
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
886
" variable not set; cannot run helper\n");
887
}
888
return false;
889
}
890
891
char interface[IF_NAMESIZE];
892
if(if_indextoname((unsigned int)if_index, interface) == NULL){
893
perror_plus("if_indextoname");
894
return false;
895
}
896
897
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
898
if(devnull == -1){
899
perror_plus("open(\"/dev/null\", O_RDONLY)");
900
return false;
901
}
902
pid_t pid = fork();
903
if(pid == 0){
904
/* Child */
905
/* Raise privileges */
906
errno = raise_privileges_permanently();
907
if(errno != 0){
908
perror_plus("Failed to raise privileges");
909
/* _exit(EX_NOPERM); */
910
} else {
911
/* Set group */
912
errno = 0;
913
ret = setgid(0);
914
if(ret == -1){
915
perror_plus("setgid");
916
_exit(EX_NOPERM);
917
}
918
/* Reset supplementary groups */
919
errno = 0;
920
ret = setgroups(0, NULL);
921
if(ret == -1){
922
perror_plus("setgroups");
923
_exit(EX_NOPERM);
924
}
925
}
926
ret = dup2(devnull, STDIN_FILENO);
927
if(ret == -1){
928
perror_plus("dup2(devnull, STDIN_FILENO)");
929
_exit(EX_OSERR);
930
}
931
ret = close(devnull);
932
if(ret == -1){
933
perror_plus("close");
934
_exit(EX_OSERR);
935
}
936
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
937
if(ret == -1){
938
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
939
_exit(EX_OSERR);
940
}
941
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
942
O_RDONLY
943
| O_DIRECTORY
944
| O_PATH
945
| O_CLOEXEC));
946
if(helperdir_fd == -1){
947
perror_plus("open");
948
_exit(EX_UNAVAILABLE);
949
}
950
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
951
helper, O_RDONLY));
952
if(helper_fd == -1){
953
perror_plus("openat");
954
close(helperdir_fd);
955
_exit(EX_UNAVAILABLE);
956
}
957
close(helperdir_fd);
958
#ifdef __GNUC__
959
#pragma GCC diagnostic push
960
#pragma GCC diagnostic ignored "-Wcast-qual"
961
#endif
962
if(fexecve(helper_fd, (char *const [])
963
{ helper, add ? add_arg : delete_arg, (char *)address,
964
interface, debug ? debug_flag : NULL, NULL },
965
environ) == -1){
966
#ifdef __GNUC__
967
#pragma GCC diagnostic pop
968
#endif
969
perror_plus("fexecve");
970
_exit(EXIT_FAILURE);
971
}
972
}
973
if(pid == -1){
974
perror_plus("fork");
975
return false;
976
}
977
int status;
978
pid_t pret = -1;
979
errno = 0;
980
do {
981
pret = waitpid(pid, &status, 0);
982
if(pret == -1 and errno == EINTR and quit_now){
983
int errno_raising = 0;
984
if((errno = raise_privileges()) != 0){
985
errno_raising = errno;
986
perror_plus("Failed to raise privileges in order to"
987
" kill helper program");
988
}
989
if(kill(pid, SIGTERM) == -1){
990
perror_plus("kill");
991
}
992
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
993
perror_plus("Failed to lower privileges after killing"
994
" helper program");
995
}
996
return false;
997
}
998
} while(pret == -1 and errno == EINTR);
999
if(pret == -1){
1000
perror_plus("waitpid");
1001
return false;
1002
}
1003
if(WIFEXITED(status)){
1004
if(WEXITSTATUS(status) != 0){
1005
fprintf_plus(stderr, "Error: iprouteadddel exited"
1006
" with status %d\n", WEXITSTATUS(status));
1007
return false;
1008
}
1009
return true;
1010
}
1011
if(WIFSIGNALED(status)){
1012
fprintf_plus(stderr, "Error: iprouteadddel died by"
1013
" signal %d\n", WTERMSIG(status));
1014
return false;
1015
}
1016
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1017
return false;
1018
}
1019
1020
__attribute__((nonnull, warn_unused_result))
1021
static bool add_local_route(const char *address,
1022
AvahiIfIndex if_index){
1023
if(debug){
1024
fprintf_plus(stderr, "Adding route to %s\n", address);
1025
}
1026
return add_delete_local_route(true, address, if_index);
1027
}
1028
1029
__attribute__((nonnull, warn_unused_result))
1030
static bool delete_local_route(const char *address,
1031
AvahiIfIndex if_index){
1032
if(debug){
1033
fprintf_plus(stderr, "Removing route to %s\n", address);
1034
}
1035
return add_delete_local_route(false, address, if_index);
1036
}
1037
605
1038
/* Called when a Mandos server is found */
606
static int start_mandos_communication(const char *ip, uint16_t port,
1039
__attribute__((nonnull, warn_unused_result))
1040
static int start_mandos_communication(const char *ip, in_port_t port,
607
1041
AvahiIfIndex if_index,
608
int af){
1042
int af, mandos_context *mc){
609
1043
int ret, tcp_sd = -1;
610
1044
ssize_t sret;
611
union {
612
struct sockaddr_in in;
613
struct sockaddr_in6 in6;
614
} to;
1045
struct sockaddr_storage to;
615
1046
char *buffer = NULL;
616
1047
char *decrypted_buffer = NULL;
617
1048
size_t buffer_length = 0;
620
1051
int retval = -1;
621
1052
gnutls_session_t session;
622
1053
int pf; /* Protocol family */
1054
bool route_added = false;
623
1055
624
1056
errno = 0;
625
1057
636
1068
pf = PF_INET;
637
1069
break;
638
1070
default:
639
fprintf(stderr, "Bad address family: %d\n", af);
1071
fprintf_plus(stderr, "Bad address family: %d\n", af);
640
1072
errno = EINVAL;
641
1073
return -1;
642
1074
}
643
1075
644
ret = init_gnutls_session(&session);
1076
/* If the interface is specified and we have a list of interfaces */
1077
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1078
/* Check if the interface is one of the interfaces we are using */
1079
bool match = false;
1080
{
1081
char *interface = NULL;
1082
while((interface = argz_next(mc->interfaces,
1083
mc->interfaces_size,
1084
interface))){
1085
if(if_nametoindex(interface) == (unsigned int)if_index){
1086
match = true;
1087
break;
1088
}
1089
}
1090
}
1091
if(not match){
1092
/* This interface does not match any in the list, so we don't
1093
connect to the server */
1094
if(debug){
1095
char interface[IF_NAMESIZE];
1096
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1097
perror_plus("if_indextoname");
1098
} else {
1099
fprintf_plus(stderr, "Skipping server on non-used interface"
1100
" \"%s\"\n",
1101
if_indextoname((unsigned int)if_index,
1102
interface));
1103
}
1104
}
1105
return -1;
1106
}
1107
}
1108
1109
ret = init_gnutls_session(&session, mc);
645
1110
if(ret != 0){
646
1111
return -1;
647
1112
}
648
1113
649
1114
if(debug){
650
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
651
"\n", ip, port);
1115
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1116
PRIuMAX "\n", ip, (uintmax_t)port);
652
1117
}
653
1118
654
tcp_sd = socket(pf, SOCK_STREAM, 0);
1119
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
655
1120
if(tcp_sd < 0){
656
1121
int e = errno;
657
1122
perror_plus("socket");
664
1129
goto mandos_end;
665
1130
}
666
1131
667
memset(&to, 0, sizeof(to));
668
1132
if(af == AF_INET6){
669
to.in6.sin6_family = (sa_family_t)af;
670
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1133
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1134
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1135
ret = inet_pton(af, ip, &to6->sin6_addr);
671
1136
} else { /* IPv4 */
672
to.in.sin_family = (sa_family_t)af;
673
ret = inet_pton(af, ip, &to.in.sin_addr);
1137
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1138
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1139
ret = inet_pton(af, ip, &to4->sin_addr);
674
1140
}
675
1141
if(ret < 0 ){
676
1142
int e = errno;
680
1146
}
681
1147
if(ret == 0){
682
1148
int e = errno;
683
fprintf(stderr, "Bad address: %s\n", ip);
1149
fprintf_plus(stderr, "Bad address: %s\n", ip);
684
1150
errno = e;
685
1151
goto mandos_end;
686
1152
}
687
1153
if(af == AF_INET6){
688
to.in6.sin6_port = htons(port); /* Spurious warnings from
689
-Wconversion and
690
-Wunreachable-code */
691
692
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
693
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
694
-Wunreachable-code*/
1154
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1155
if(IN6_IS_ADDR_LINKLOCAL
1156
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
695
1157
if(if_index == AVAHI_IF_UNSPEC){
696
fprintf(stderr, "An IPv6 link-local address is incomplete"
697
" without a network interface\n");
1158
fprintf_plus(stderr, "An IPv6 link-local address is"
1159
" incomplete without a network interface\n");
698
1160
errno = EINVAL;
699
1161
goto mandos_end;
700
1162
}
701
1163
/* Set the network interface number as scope */
702
to.in6.sin6_scope_id = (uint32_t)if_index;
1164
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
703
1165
}
704
1166
} else {
705
to.in.sin_port = htons(port); /* Spurious warnings from
706
-Wconversion and
707
-Wunreachable-code */
1167
((struct sockaddr_in *)&to)->sin_port = htons(port);
708
1168
}
709
1169
710
1170
if(quit_now){
718
1178
if(if_indextoname((unsigned int)if_index, interface) == NULL){
719
1179
perror_plus("if_indextoname");
720
1180
} else {
721
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
722
ip, interface, port);
1181
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1182
"\n", ip, interface, (uintmax_t)port);
723
1183
}
724
1184
} else {
725
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
726
port);
1185
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1186
ip, (uintmax_t)port);
727
1187
}
728
1188
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
729
1189
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
730
const char *pcret;
731
if(af == AF_INET6){
732
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
733
sizeof(addrstr));
734
} else {
735
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
736
sizeof(addrstr));
737
}
738
if(pcret == NULL){
739
perror_plus("inet_ntop");
740
} else {
741
if(strcmp(addrstr, ip) != 0){
742
fprintf(stderr, "Canonical address form: %s\n", addrstr);
743
}
744
}
745
}
746
747
if(quit_now){
748
errno = EINTR;
749
goto mandos_end;
750
}
751
752
if(af == AF_INET6){
753
ret = connect(tcp_sd, &to.in6, sizeof(to));
754
} else {
755
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
756
}
757
if(ret < 0){
758
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
759
int e = errno;
760
perror_plus("connect");
761
errno = e;
762
}
763
goto mandos_end;
764
}
765
766
if(quit_now){
767
errno = EINTR;
768
goto mandos_end;
1190
if(af == AF_INET6){
1191
ret = getnameinfo((struct sockaddr *)&to,
1192
sizeof(struct sockaddr_in6),
1193
addrstr, sizeof(addrstr), NULL, 0,
1194
NI_NUMERICHOST);
1195
} else {
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in),
1198
addrstr, sizeof(addrstr), NULL, 0,
1199
NI_NUMERICHOST);
1200
}
1201
if(ret == EAI_SYSTEM){
1202
perror_plus("getnameinfo");
1203
} else if(ret != 0) {
1204
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1205
} else if(strcmp(addrstr, ip) != 0){
1206
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1207
}
1208
}
1209
1210
if(quit_now){
1211
errno = EINTR;
1212
goto mandos_end;
1213
}
1214
1215
while(true){
1216
if(af == AF_INET6){
1217
ret = connect(tcp_sd, (struct sockaddr *)&to,
1218
sizeof(struct sockaddr_in6));
1219
} else {
1220
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1221
sizeof(struct sockaddr_in));
1222
}
1223
if(ret < 0){
1224
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1225
and if_index != AVAHI_IF_UNSPEC
1226
and connect_to == NULL
1227
and not route_added and
1228
((af == AF_INET6 and not
1229
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1230
&to)->sin6_addr)))
1231
or (af == AF_INET and
1232
/* Not a a IPv4LL address */
1233
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1234
& 0xFFFF0000L) != 0xA9FE0000L))){
1235
/* Work around Avahi bug - Avahi does not announce link-local
1236
addresses if it has a global address, so local hosts with
1237
*only* a link-local address (e.g. Mandos clients) cannot
1238
connect to a Mandos server announced by Avahi on a server
1239
host with a global address. Work around this by retrying
1240
with an explicit route added with the server's address.
1241
1242
Avahi bug reference:
1243
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://bugs.debian.org/587961
1245
*/
1246
if(debug){
1247
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
" direct route\n");
1249
}
1250
int e = errno;
1251
route_added = add_local_route(ip, if_index);
1252
if(route_added){
1253
continue;
1254
}
1255
errno = e;
1256
}
1257
if(errno != ECONNREFUSED or debug){
1258
int e = errno;
1259
perror_plus("connect");
1260
errno = e;
1261
}
1262
goto mandos_end;
1263
}
1264
1265
if(quit_now){
1266
errno = EINTR;
1267
goto mandos_end;
1268
}
1269
break;
769
1270
}
770
1271
771
1272
const char *out = mandos_protocol_version;
773
1274
while(true){
774
1275
size_t out_size = strlen(out);
775
1276
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
776
out_size - written));
1277
out_size - written));
777
1278
if(ret == -1){
778
1279
int e = errno;
779
1280
perror_plus("write");
799
1300
}
800
1301
801
1302
if(debug){
802
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1303
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
803
1304
}
804
1305
805
1306
if(quit_now){
807
1308
goto mandos_end;
808
1309
}
809
1310
810
/* Spurious warning from -Wint-to-pointer-cast */
811
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1311
/* This casting via intptr_t is to eliminate warning about casting
1312
an int to a pointer type. This is exactly how the GnuTLS Guile
1313
function "set-session-transport-fd!" does it. */
1314
gnutls_transport_set_ptr(session,
1315
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
812
1316
813
1317
if(quit_now){
814
1318
errno = EINTR;
825
1329
826
1330
if(ret != GNUTLS_E_SUCCESS){
827
1331
if(debug){
828
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1332
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
829
1333
gnutls_perror(ret);
830
1334
}
831
1335
errno = EPROTO;
835
1339
/* Read OpenPGP packet that contains the wanted password */
836
1340
837
1341
if(debug){
838
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
839
ip);
1342
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1343
" %s\n", ip);
840
1344
}
841
1345
842
1346
while(true){
847
1351
}
848
1352
849
1353
buffer_capacity = incbuffer(&buffer, buffer_length,
850
buffer_capacity);
1354
buffer_capacity);
851
1355
if(buffer_capacity == 0){
852
1356
int e = errno;
853
1357
perror_plus("incbuffer");
880
1384
}
881
1385
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
882
1386
if(ret < 0){
883
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1387
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1388
"***\n");
884
1389
gnutls_perror(ret);
885
1390
errno = EPROTO;
886
1391
goto mandos_end;
887
1392
}
888
1393
break;
889
1394
default:
890
fprintf(stderr, "Unknown error while reading data from"
891
" encrypted session with Mandos server\n");
1395
fprintf_plus(stderr, "Unknown error while reading data from"
1396
" encrypted session with Mandos server\n");
892
1397
gnutls_bye(session, GNUTLS_SHUT_RDWR);
893
1398
errno = EIO;
894
1399
goto mandos_end;
899
1404
}
900
1405
901
1406
if(debug){
902
fprintf(stderr, "Closing TLS session\n");
1407
fprintf_plus(stderr, "Closing TLS session\n");
903
1408
}
904
1409
905
1410
if(quit_now){
917
1422
918
1423
if(buffer_length > 0){
919
1424
ssize_t decrypted_buffer_size;
920
decrypted_buffer_size = pgp_packet_decrypt(buffer,
921
buffer_length,
922
&decrypted_buffer);
1425
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1426
&decrypted_buffer, mc);
923
1427
if(decrypted_buffer_size >= 0){
924
1428
1429
clearerr(stdout);
925
1430
written = 0;
926
1431
while(written < (size_t) decrypted_buffer_size){
927
1432
if(quit_now){
935
1440
if(ret == 0 and ferror(stdout)){
936
1441
int e = errno;
937
1442
if(debug){
938
fprintf(stderr, "Error writing encrypted data: %s\n",
939
strerror(errno));
1443
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1444
strerror(errno));
940
1445
}
941
1446
errno = e;
942
1447
goto mandos_end;
943
1448
}
944
1449
written += (size_t)ret;
945
1450
}
1451
ret = fflush(stdout);
1452
if(ret != 0){
1453
int e = errno;
1454
if(debug){
1455
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1456
strerror(errno));
1457
}
1458
errno = e;
1459
goto mandos_end;
1460
}
946
1461
retval = 0;
947
1462
}
948
1463
}
951
1466
952
1467
mandos_end:
953
1468
{
1469
if(route_added){
1470
if(not delete_local_route(ip, if_index)){
1471
fprintf_plus(stderr, "Failed to delete local route to %s on"
1472
" interface %d", ip, if_index);
1473
}
1474
}
954
1475
int e = errno;
955
1476
free(decrypted_buffer);
956
1477
free(buffer);
957
1478
if(tcp_sd >= 0){
958
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1479
ret = close(tcp_sd);
959
1480
}
960
1481
if(ret == -1){
961
1482
if(e == 0){
986
1507
AVAHI_GCC_UNUSED AvahiStringList *txt,
987
1508
AVAHI_GCC_UNUSED AvahiLookupResultFlags
988
1509
flags,
989
AVAHI_GCC_UNUSED void* userdata){
990
assert(r);
1510
void *mc){
1511
if(r == NULL){
1512
return;
1513
}
991
1514
992
1515
/* Called whenever a service has been resolved successfully or
993
1516
timed out */
994
1517
995
1518
if(quit_now){
1519
avahi_s_service_resolver_free(r);
996
1520
return;
997
1521
}
998
1522
999
1523
switch(event){
1000
1524
default:
1001
1525
case AVAHI_RESOLVER_FAILURE:
1002
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
1003
" of type '%s' in domain '%s': %s\n", name, type, domain,
1004
avahi_strerror(avahi_server_errno(mc.server)));
1526
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1527
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1528
domain,
1529
avahi_strerror(avahi_server_errno
1530
(((mandos_context*)mc)->server)));
1005
1531
break;
1006
1532
1007
1533
case AVAHI_RESOLVER_FOUND:
1009
1535
char ip[AVAHI_ADDRESS_STR_MAX];
1010
1536
avahi_address_snprint(ip, sizeof(ip), address);
1011
1537
if(debug){
1012
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1013
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1014
ip, (intmax_t)interface, port);
1538
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1539
PRIdMAX ") on port %" PRIu16 "\n", name,
1540
host_name, ip, (intmax_t)interface, port);
1015
1541
}
1016
int ret = start_mandos_communication(ip, port, interface,
1017
avahi_proto_to_af(proto));
1542
int ret = start_mandos_communication(ip, (in_port_t)port,
1543
interface,
1544
avahi_proto_to_af(proto),
1545
mc);
1018
1546
if(ret == 0){
1019
avahi_simple_poll_quit(mc.simple_poll);
1547
avahi_simple_poll_quit(simple_poll);
1020
1548
} else {
1021
ret = add_server(ip, port, interface,
1022
avahi_proto_to_af(proto));
1549
if(not add_server(ip, (in_port_t)port, interface,
1550
avahi_proto_to_af(proto),
1551
&((mandos_context*)mc)->current_server)){
1552
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1553
" list\n", name);
1554
}
1023
1555
}
1024
1556
}
1025
1557
}
1035
1567
const char *domain,
1036
1568
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1037
1569
flags,
1038
AVAHI_GCC_UNUSED void* userdata){
1039
assert(b);
1570
void *mc){
1571
if(b == NULL){
1572
return;
1573
}
1040
1574
1041
1575
/* Called whenever a new services becomes available on the LAN or
1042
1576
is removed from the LAN */
1049
1583
default:
1050
1584
case AVAHI_BROWSER_FAILURE:
1051
1585
1052
fprintf(stderr, "(Avahi browser) %s\n",
1053
avahi_strerror(avahi_server_errno(mc.server)));
1054
avahi_simple_poll_quit(mc.simple_poll);
1586
fprintf_plus(stderr, "(Avahi browser) %s\n",
1587
avahi_strerror(avahi_server_errno
1588
(((mandos_context*)mc)->server)));
1589
avahi_simple_poll_quit(simple_poll);
1055
1590
return;
1056
1591
1057
1592
case AVAHI_BROWSER_NEW:
1060
1595
the callback function is called the Avahi server will free the
1061
1596
resolver for us. */
1062
1597
1063
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1064
name, type, domain, protocol, 0,
1065
resolve_callback, NULL) == NULL)
1066
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1067
name, avahi_strerror(avahi_server_errno(mc.server)));
1598
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1599
interface, protocol, name, type,
1600
domain, protocol, 0,
1601
resolve_callback, mc) == NULL)
1602
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1603
" %s\n", name,
1604
avahi_strerror(avahi_server_errno
1605
(((mandos_context*)mc)->server)));
1068
1606
break;
1069
1607
1070
1608
case AVAHI_BROWSER_REMOVE:
1073
1611
case AVAHI_BROWSER_ALL_FOR_NOW:
1074
1612
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1075
1613
if(debug){
1076
fprintf(stderr, "No Mandos server found, still searching...\n");
1614
fprintf_plus(stderr, "No Mandos server found, still"
1615
" searching...\n");
1077
1616
}
1078
1617
break;
1079
1618
}
1088
1627
signal_received = sig;
1089
1628
int old_errno = errno;
1090
1629
/* set main loop to exit */
1091
if(mc.simple_poll != NULL){
1092
avahi_simple_poll_quit(mc.simple_poll);
1630
if(simple_poll != NULL){
1631
avahi_simple_poll_quit(simple_poll);
1093
1632
}
1094
1633
errno = old_errno;
1095
1634
}
1096
1635
1636
__attribute__((nonnull, warn_unused_result))
1097
1637
bool get_flags(const char *ifname, struct ifreq *ifr){
1098
1638
int ret;
1639
int old_errno;
1099
1640
1100
1641
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1101
1642
if(s < 0){
1643
old_errno = errno;
1102
1644
perror_plus("socket");
1645
errno = old_errno;
1103
1646
return false;
1104
1647
}
1105
strcpy(ifr->ifr_name, ifname);
1648
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1649
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1106
1650
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1107
1651
if(ret == -1){
1108
1652
if(debug){
1653
old_errno = errno;
1109
1654
perror_plus("ioctl SIOCGIFFLAGS");
1655
errno = old_errno;
1110
1656
}
1111
1657
return false;
1112
1658
}
1113
1659
return true;
1114
1660
}
1115
1661
1662
__attribute__((nonnull, warn_unused_result))
1116
1663
bool good_flags(const char *ifname, const struct ifreq *ifr){
1117
1664
1118
1665
/* Reject the loopback device */
1119
1666
if(ifr->ifr_flags & IFF_LOOPBACK){
1120
1667
if(debug){
1121
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1122
ifname);
1668
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1669
ifname);
1123
1670
}
1124
1671
return false;
1125
1672
}
1126
1673
/* Accept point-to-point devices only if connect_to is specified */
1127
1674
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1128
1675
if(debug){
1129
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1130
ifname);
1676
fprintf_plus(stderr, "Accepting point-to-point interface"
1677
" \"%s\"\n", ifname);
1131
1678
}
1132
1679
return true;
1133
1680
}
1134
1681
/* Otherwise, reject non-broadcast-capable devices */
1135
1682
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1136
1683
if(debug){
1137
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1138
ifname);
1684
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1685
" \"%s\"\n", ifname);
1139
1686
}
1140
1687
return false;
1141
1688
}
1142
1689
/* Reject non-ARP interfaces (including dummy interfaces) */
1143
1690
if(ifr->ifr_flags & IFF_NOARP){
1144
1691
if(debug){
1145
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1692
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1693
ifname);
1146
1694
}
1147
1695
return false;
1148
1696
}
1149
1697
1150
1698
/* Accept this device */
1151
1699
if(debug){
1152
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1700
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1153
1701
}
1154
1702
return true;
1155
1703
}
1159
1707
* corresponds to an acceptable network device.
1160
1708
* (This function is passed to scandir(3) as a filter function.)
1161
1709
*/
1710
__attribute__((nonnull, warn_unused_result))
1162
1711
int good_interface(const struct dirent *if_entry){
1163
int ret;
1164
1712
if(if_entry->d_name[0] == '.'){
1165
1713
return 0;
1166
1714
}
1715
1167
1716
struct ifreq ifr;
1168
1169
1717
if(not get_flags(if_entry->d_name, &ifr)){
1718
if(debug){
1719
fprintf_plus(stderr, "Failed to get flags for interface "
1720
"\"%s\"\n", if_entry->d_name);
1721
}
1170
1722
return 0;
1171
1723
}
1172
1724
1177
1729
}
1178
1730
1179
1731
/*
1180
* This function determines if a directory entry in /sys/class/net
1181
* corresponds to an acceptable network device which is up.
1182
* (This function is passed to scandir(3) as a filter function.)
1183
*/
1184
int up_interface(const struct dirent *if_entry){
1185
ssize_t ssret;
1186
char *flagname = NULL;
1187
if(if_entry->d_name[0] == '.'){
1188
return 0;
1189
}
1190
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1191
if_entry->d_name);
1192
if(ret < 0){
1193
perror_plus("asprintf");
1194
return 0;
1195
}
1196
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1197
if(flags_fd == -1){
1198
perror_plus("open");
1199
free(flagname);
1200
return 0;
1201
}
1202
free(flagname);
1203
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1204
/* read line from flags_fd */
1205
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1206
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1207
flagstring[(size_t)to_read] = '\0';
1208
if(flagstring == NULL){
1209
perror_plus("malloc");
1210
close(flags_fd);
1211
return 0;
1212
}
1213
while(to_read > 0){
1214
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1215
(size_t)to_read));
1216
if(ssret == -1){
1217
perror_plus("read");
1218
free(flagstring);
1219
close(flags_fd);
1220
return 0;
1221
}
1222
to_read -= ssret;
1223
if(ssret == 0){
1224
break;
1225
}
1226
}
1227
close(flags_fd);
1228
intmax_t tmpmax;
1229
char *tmp;
1230
errno = 0;
1231
tmpmax = strtoimax(flagstring, &tmp, 0);
1232
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1233
and not (isspace(*tmp)))
1234
or tmpmax != (ifreq_flags)tmpmax){
1235
if(debug){
1236
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1237
flagstring, if_entry->d_name);
1238
}
1239
free(flagstring);
1240
return 0;
1241
}
1242
free(flagstring);
1243
ifreq_flags flags = (ifreq_flags)tmpmax;
1244
/* Reject the loopback device */
1245
if(flags & IFF_LOOPBACK){
1246
if(debug){
1247
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1248
if_entry->d_name);
1249
}
1250
return 0;
1251
}
1252
1253
/* Reject down interfaces */
1254
if(not (flags & IFF_UP)){
1255
return 0;
1256
}
1257
1258
/* Accept point-to-point devices only if connect_to is specified */
1259
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1260
if(debug){
1261
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1262
if_entry->d_name);
1263
}
1264
return 1;
1265
}
1266
/* Otherwise, reject non-broadcast-capable devices */
1267
if(not (flags & IFF_BROADCAST)){
1268
if(debug){
1269
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1270
if_entry->d_name);
1271
}
1272
return 0;
1273
}
1274
/* Reject non-ARP interfaces (including dummy interfaces) */
1275
if(flags & IFF_NOARP){
1276
if(debug){
1277
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1278
if_entry->d_name);
1279
}
1280
return 0;
1281
}
1282
/* Accept this device */
1283
if(debug){
1284
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1285
if_entry->d_name);
1286
}
1287
return 1;
1288
}
1289
1732
* This function determines if a network interface is up.
1733
*/
1734
__attribute__((nonnull, warn_unused_result))
1735
bool interface_is_up(const char *interface){
1736
struct ifreq ifr;
1737
if(not get_flags(interface, &ifr)){
1738
if(debug){
1739
fprintf_plus(stderr, "Failed to get flags for interface "
1740
"\"%s\"\n", interface);
1741
}
1742
return false;
1743
}
1744
1745
return (bool)(ifr.ifr_flags & IFF_UP);
1746
}
1747
1748
/*
1749
* This function determines if a network interface is running
1750
*/
1751
__attribute__((nonnull, warn_unused_result))
1752
bool interface_is_running(const char *interface){
1753
struct ifreq ifr;
1754
if(not get_flags(interface, &ifr)){
1755
if(debug){
1756
fprintf_plus(stderr, "Failed to get flags for interface "
1757
"\"%s\"\n", interface);
1758
}
1759
return false;
1760
}
1761
1762
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1763
}
1764
1765
__attribute__((nonnull, pure, warn_unused_result))
1290
1766
int notdotentries(const struct dirent *direntry){
1291
1767
/* Skip "." and ".." */
1292
1768
if(direntry->d_name[0] == '.'
1299
1775
}
1300
1776
1301
1777
/* Is this directory entry a runnable program? */
1778
__attribute__((nonnull, warn_unused_result))
1302
1779
int runnable_hook(const struct dirent *direntry){
1303
1780
int ret;
1781
size_t sret;
1304
1782
struct stat st;
1305
1783
1306
1784
if((direntry->d_name)[0] == '\0'){
1308
1786
return 0;
1309
1787
}
1310
1788
1311
/* Save pointer to last character */
1312
char *end = strchr(direntry->d_name, '\0')-1;
1313
1314
if(*end == '~'){
1315
/* Backup name~ */
1316
return 0;
1317
}
1318
1319
if(((direntry->d_name)[0] == '#')
1320
and (*end == '#')){
1321
/* Temporary #name# */
1322
return 0;
1323
}
1324
1325
/* XXX more rules here */
1326
1327
ret = stat(direntry->d_name, &st);
1789
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1790
"abcdefghijklmnopqrstuvwxyz"
1791
"0123456789"
1792
"_.-");
1793
if((direntry->d_name)[sret] != '\0'){
1794
/* Contains non-allowed characters */
1795
if(debug){
1796
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1797
direntry->d_name);
1798
}
1799
return 0;
1800
}
1801
1802
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1328
1803
if(ret == -1){
1329
1804
if(debug){
1330
perror_plus("Could not stat plugin");
1805
perror_plus("Could not stat hook");
1331
1806
}
1332
1807
return 0;
1333
1808
}
1334
if(not (st.st_mode & S_ISREG)){
1809
if(not (S_ISREG(st.st_mode))){
1335
1810
/* Not a regular file */
1811
if(debug){
1812
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1813
direntry->d_name);
1814
}
1336
1815
return 0;
1337
1816
}
1338
1817
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1339
1818
/* Not executable */
1819
if(debug){
1820
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1821
direntry->d_name);
1822
}
1340
1823
return 0;
1341
1824
}
1825
if(debug){
1826
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1827
direntry->d_name);
1828
}
1342
1829
return 1;
1343
1830
}
1344
1831
1345
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1832
__attribute__((nonnull, warn_unused_result))
1833
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1834
mandos_context *mc){
1346
1835
int ret;
1347
1836
struct timespec now;
1348
1837
struct timespec waited_time;
1349
1838
intmax_t block_time;
1350
1839
1351
1840
while(true){
1352
if(mc.current_server == NULL){
1353
if (debug){
1354
fprintf(stderr,
1355
"Wait until first server is found. No timeout!\n");
1841
if(mc->current_server == NULL){
1842
if(debug){
1843
fprintf_plus(stderr, "Wait until first server is found."
1844
" No timeout!\n");
1356
1845
}
1357
1846
ret = avahi_simple_poll_iterate(s, -1);
1358
1847
} else {
1359
if (debug){
1360
fprintf(stderr, "Check current_server if we should run it,"
1361
" or wait\n");
1848
if(debug){
1849
fprintf_plus(stderr, "Check current_server if we should run"
1850
" it, or wait\n");
1362
1851
}
1363
1852
/* the current time */
1364
1853
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1369
1858
/* Calculating in ms how long time between now and server
1370
1859
who we visted longest time ago. Now - last seen. */
1371
1860
waited_time.tv_sec = (now.tv_sec
1372
- mc.current_server->last_seen.tv_sec);
1861
- mc->current_server->last_seen.tv_sec);
1373
1862
waited_time.tv_nsec = (now.tv_nsec
1374
- mc.current_server->last_seen.tv_nsec);
1863
- mc->current_server->last_seen.tv_nsec);
1375
1864
/* total time is 10s/10,000ms.
1376
1865
Converting to s from ms by dividing by 1,000,
1377
1866
and ns to ms by dividing by 1,000,000. */
1379
1868
- ((intmax_t)waited_time.tv_sec * 1000))
1380
1869
- ((intmax_t)waited_time.tv_nsec / 1000000));
1381
1870
1382
if (debug){
1383
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1871
if(debug){
1872
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1873
block_time);
1384
1874
}
1385
1875
1386
1876
if(block_time <= 0){
1387
ret = start_mandos_communication(mc.current_server->ip,
1388
mc.current_server->port,
1389
mc.current_server->if_index,
1390
mc.current_server->af);
1877
ret = start_mandos_communication(mc->current_server->ip,
1878
mc->current_server->port,
1879
mc->current_server->if_index,
1880
mc->current_server->af, mc);
1391
1881
if(ret == 0){
1392
avahi_simple_poll_quit(mc.simple_poll);
1882
avahi_simple_poll_quit(s);
1393
1883
return 0;
1394
1884
}
1395
1885
ret = clock_gettime(CLOCK_MONOTONIC,
1396
&mc.current_server->last_seen);
1886
&mc->current_server->last_seen);
1397
1887
if(ret == -1){
1398
1888
perror_plus("clock_gettime");
1399
1889
return -1;
1400
1890
}
1401
mc.current_server = mc.current_server->next;
1891
mc->current_server = mc->current_server->next;
1402
1892
block_time = 0; /* Call avahi to find new Mandos
1403
1893
servers, but don't block */
1404
1894
}
1406
1896
ret = avahi_simple_poll_iterate(s, (int)block_time);
1407
1897
}
1408
1898
if(ret != 0){
1409
if (ret > 0 or errno != EINTR) {
1899
if(ret > 0 or errno != EINTR){
1410
1900
return (ret != 1) ? ret : 0;
1411
1901
}
1412
1902
}
1413
1903
}
1414
1904
}
1415
1905
1906
__attribute__((nonnull))
1907
void run_network_hooks(const char *mode, const char *interface,
1908
const float delay){
1909
struct dirent **direntries = NULL;
1910
if(hookdir_fd == -1){
1911
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1912
| O_CLOEXEC);
1913
if(hookdir_fd == -1){
1914
if(errno == ENOENT){
1915
if(debug){
1916
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1917
" found\n", hookdir);
1918
}
1919
} else {
1920
perror_plus("open");
1921
}
1922
return;
1923
}
1924
}
1925
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1926
runnable_hook, alphasort);
1927
if(numhooks == -1){
1928
perror_plus("scandir");
1929
return;
1930
}
1931
struct dirent *direntry;
1932
int ret;
1933
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1934
if(devnull == -1){
1935
perror_plus("open(\"/dev/null\", O_RDONLY)");
1936
return;
1937
}
1938
for(int i = 0; i < numhooks; i++){
1939
direntry = direntries[i];
1940
if(debug){
1941
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1942
direntry->d_name);
1943
}
1944
pid_t hook_pid = fork();
1945
if(hook_pid == 0){
1946
/* Child */
1947
/* Raise privileges */
1948
errno = raise_privileges_permanently();
1949
if(errno != 0){
1950
perror_plus("Failed to raise privileges");
1951
_exit(EX_NOPERM);
1952
}
1953
/* Set group */
1954
errno = 0;
1955
ret = setgid(0);
1956
if(ret == -1){
1957
perror_plus("setgid");
1958
_exit(EX_NOPERM);
1959
}
1960
/* Reset supplementary groups */
1961
errno = 0;
1962
ret = setgroups(0, NULL);
1963
if(ret == -1){
1964
perror_plus("setgroups");
1965
_exit(EX_NOPERM);
1966
}
1967
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1968
if(ret == -1){
1969
perror_plus("setenv");
1970
_exit(EX_OSERR);
1971
}
1972
ret = setenv("DEVICE", interface, 1);
1973
if(ret == -1){
1974
perror_plus("setenv");
1975
_exit(EX_OSERR);
1976
}
1977
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1978
if(ret == -1){
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
ret = setenv("MODE", mode, 1);
1983
if(ret == -1){
1984
perror_plus("setenv");
1985
_exit(EX_OSERR);
1986
}
1987
char *delaystring;
1988
ret = asprintf(&delaystring, "%f", (double)delay);
1989
if(ret == -1){
1990
perror_plus("asprintf");
1991
_exit(EX_OSERR);
1992
}
1993
ret = setenv("DELAY", delaystring, 1);
1994
if(ret == -1){
1995
free(delaystring);
1996
perror_plus("setenv");
1997
_exit(EX_OSERR);
1998
}
1999
free(delaystring);
2000
if(connect_to != NULL){
2001
ret = setenv("CONNECT", connect_to, 1);
2002
if(ret == -1){
2003
perror_plus("setenv");
2004
_exit(EX_OSERR);
2005
}
2006
}
2007
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2008
direntry->d_name,
2009
O_RDONLY));
2010
if(hook_fd == -1){
2011
perror_plus("openat");
2012
_exit(EXIT_FAILURE);
2013
}
2014
if(close(hookdir_fd) == -1){
2015
perror_plus("close");
2016
_exit(EXIT_FAILURE);
2017
}
2018
ret = dup2(devnull, STDIN_FILENO);
2019
if(ret == -1){
2020
perror_plus("dup2(devnull, STDIN_FILENO)");
2021
_exit(EX_OSERR);
2022
}
2023
ret = close(devnull);
2024
if(ret == -1){
2025
perror_plus("close");
2026
_exit(EX_OSERR);
2027
}
2028
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2029
if(ret == -1){
2030
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2031
_exit(EX_OSERR);
2032
}
2033
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2034
environ) == -1){
2035
perror_plus("fexecve");
2036
_exit(EXIT_FAILURE);
2037
}
2038
} else {
2039
if(hook_pid == -1){
2040
perror_plus("fork");
2041
free(direntry);
2042
continue;
2043
}
2044
int status;
2045
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2046
perror_plus("waitpid");
2047
free(direntry);
2048
continue;
2049
}
2050
if(WIFEXITED(status)){
2051
if(WEXITSTATUS(status) != 0){
2052
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2053
" with status %d\n", direntry->d_name,
2054
WEXITSTATUS(status));
2055
free(direntry);
2056
continue;
2057
}
2058
} else if(WIFSIGNALED(status)){
2059
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2060
" signal %d\n", direntry->d_name,
2061
WTERMSIG(status));
2062
free(direntry);
2063
continue;
2064
} else {
2065
fprintf_plus(stderr, "Warning: network hook \"%s\""
2066
" crashed\n", direntry->d_name);
2067
free(direntry);
2068
continue;
2069
}
2070
}
2071
if(debug){
2072
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2073
direntry->d_name);
2074
}
2075
free(direntry);
2076
}
2077
free(direntries);
2078
if(close(hookdir_fd) == -1){
2079
perror_plus("close");
2080
} else {
2081
hookdir_fd = -1;
2082
}
2083
close(devnull);
2084
}
2085
2086
__attribute__((nonnull, warn_unused_result))
2087
int bring_up_interface(const char *const interface,
2088
const float delay){
2089
int old_errno = errno;
2090
int ret;
2091
struct ifreq network;
2092
unsigned int if_index = if_nametoindex(interface);
2093
if(if_index == 0){
2094
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2095
errno = old_errno;
2096
return ENXIO;
2097
}
2098
2099
if(quit_now){
2100
errno = old_errno;
2101
return EINTR;
2102
}
2103
2104
if(not interface_is_up(interface)){
2105
int ret_errno = 0;
2106
int ioctl_errno = 0;
2107
if(not get_flags(interface, &network)){
2108
ret_errno = errno;
2109
fprintf_plus(stderr, "Failed to get flags for interface "
2110
"\"%s\"\n", interface);
2111
errno = old_errno;
2112
return ret_errno;
2113
}
2114
network.ifr_flags |= IFF_UP; /* set flag */
2115
2116
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2117
if(sd == -1){
2118
ret_errno = errno;
2119
perror_plus("socket");
2120
errno = old_errno;
2121
return ret_errno;
2122
}
2123
2124
if(quit_now){
2125
ret = close(sd);
2126
if(ret == -1){
2127
perror_plus("close");
2128
}
2129
errno = old_errno;
2130
return EINTR;
2131
}
2132
2133
if(debug){
2134
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2135
interface);
2136
}
2137
2138
/* Raise privileges */
2139
ret_errno = raise_privileges();
2140
if(ret_errno != 0){
2141
errno = ret_errno;
2142
perror_plus("Failed to raise privileges");
2143
}
2144
2145
#ifdef __linux__
2146
int ret_linux;
2147
bool restore_loglevel = false;
2148
if(ret_errno == 0){
2149
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2150
messages about the network interface to mess up the prompt */
2151
ret_linux = klogctl(8, NULL, 5);
2152
if(ret_linux == -1){
2153
perror_plus("klogctl");
2154
} else {
2155
restore_loglevel = true;
2156
}
2157
}
2158
#endif /* __linux__ */
2159
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2160
ioctl_errno = errno;
2161
#ifdef __linux__
2162
if(restore_loglevel){
2163
ret_linux = klogctl(7, NULL, 0);
2164
if(ret_linux == -1){
2165
perror_plus("klogctl");
2166
}
2167
}
2168
#endif /* __linux__ */
2169
2170
/* If raise_privileges() succeeded above */
2171
if(ret_errno == 0){
2172
/* Lower privileges */
2173
ret_errno = lower_privileges();
2174
if(ret_errno != 0){
2175
errno = ret_errno;
2176
perror_plus("Failed to lower privileges");
2177
}
2178
}
2179
2180
/* Close the socket */
2181
ret = close(sd);
2182
if(ret == -1){
2183
perror_plus("close");
2184
}
2185
2186
if(ret_setflags == -1){
2187
errno = ioctl_errno;
2188
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2189
errno = old_errno;
2190
return ioctl_errno;
2191
}
2192
} else if(debug){
2193
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2194
interface);
2195
}
2196
2197
/* Sleep checking until interface is running.
2198
Check every 0.25s, up to total time of delay */
2199
for(int i = 0; i < delay * 4; i++){
2200
if(interface_is_running(interface)){
2201
break;
2202
}
2203
struct timespec sleeptime = { .tv_nsec = 250000000 };
2204
ret = nanosleep(&sleeptime, NULL);
2205
if(ret == -1 and errno != EINTR){
2206
perror_plus("nanosleep");
2207
}
2208
}
2209
2210
errno = old_errno;
2211
return 0;
2212
}
2213
2214
__attribute__((nonnull, warn_unused_result))
2215
int take_down_interface(const char *const interface){
2216
int old_errno = errno;
2217
struct ifreq network;
2218
unsigned int if_index = if_nametoindex(interface);
2219
if(if_index == 0){
2220
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2221
errno = old_errno;
2222
return ENXIO;
2223
}
2224
if(interface_is_up(interface)){
2225
int ret_errno = 0;
2226
int ioctl_errno = 0;
2227
if(not get_flags(interface, &network) and debug){
2228
ret_errno = errno;
2229
fprintf_plus(stderr, "Failed to get flags for interface "
2230
"\"%s\"\n", interface);
2231
errno = old_errno;
2232
return ret_errno;
2233
}
2234
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2235
2236
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2237
if(sd == -1){
2238
ret_errno = errno;
2239
perror_plus("socket");
2240
errno = old_errno;
2241
return ret_errno;
2242
}
2243
2244
if(debug){
2245
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2246
interface);
2247
}
2248
2249
/* Raise privileges */
2250
ret_errno = raise_privileges();
2251
if(ret_errno != 0){
2252
errno = ret_errno;
2253
perror_plus("Failed to raise privileges");
2254
}
2255
2256
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2257
ioctl_errno = errno;
2258
2259
/* If raise_privileges() succeeded above */
2260
if(ret_errno == 0){
2261
/* Lower privileges */
2262
ret_errno = lower_privileges();
2263
if(ret_errno != 0){
2264
errno = ret_errno;
2265
perror_plus("Failed to lower privileges");
2266
}
2267
}
2268
2269
/* Close the socket */
2270
int ret = close(sd);
2271
if(ret == -1){
2272
perror_plus("close");
2273
}
2274
2275
if(ret_setflags == -1){
2276
errno = ioctl_errno;
2277
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2278
errno = old_errno;
2279
return ioctl_errno;
2280
}
2281
} else if(debug){
2282
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2283
interface);
2284
}
2285
2286
errno = old_errno;
2287
return 0;
2288
}
2289
1416
2290
int main(int argc, char *argv[]){
2291
mandos_context mc = { .server = NULL, .dh_bits = 0,
2292
.priority = "SECURE256:!CTYPE-X.509"
2293
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2294
.current_server = NULL, .interfaces = NULL,
2295
.interfaces_size = 0 };
1417
2296
AvahiSServiceBrowser *sb = NULL;
1418
int error;
2297
error_t ret_errno;
1419
2298
int ret;
1420
2299
intmax_t tmpmax;
1421
2300
char *tmp;
1422
2301
int exitcode = EXIT_SUCCESS;
1423
const char *interface = "";
1424
struct ifreq network;
1425
int sd = -1;
1426
bool take_down_interface = false;
1427
uid_t uid;
1428
gid_t gid;
1429
char tempdir[] = "/tmp/mandosXXXXXX";
1430
bool tempdir_created = false;
2302
char *interfaces_to_take_down = NULL;
2303
size_t interfaces_to_take_down_size = 0;
2304
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2305
char old_tempdir[] = "/tmp/mandosXXXXXX";
2306
char *tempdir = NULL;
1431
2307
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1432
2308
const char *seckey = PATHDIR "/" SECKEY;
1433
2309
const char *pubkey = PATHDIR "/" PUBKEY;
2310
const char *dh_params_file = NULL;
2311
char *interfaces_hooks = NULL;
1434
2312
1435
2313
bool gnutls_initialized = false;
1436
2314
bool gpgme_initialized = false;
1488
2366
.doc = "Bit length of the prime number used in the"
1489
2367
" Diffie-Hellman key exchange",
1490
2368
.group = 2 },
2369
{ .name = "dh-params", .key = 134,
2370
.arg = "FILE",
2371
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2372
" for the Diffie-Hellman key exchange",
2373
.group = 2 },
1491
2374
{ .name = "priority", .key = 130,
1492
2375
.arg = "STRING",
1493
2376
.doc = "GnuTLS priority string for the TLS handshake",
1498
2381
.group = 2 },
1499
2382
{ .name = "retry", .key = 132,
1500
2383
.arg = "SECONDS",
1501
.doc = "Retry interval used when denied by the mandos server",
2384
.doc = "Retry interval used when denied by the Mandos server",
2385
.group = 2 },
2386
{ .name = "network-hook-dir", .key = 133,
2387
.arg = "DIR",
2388
.doc = "Directory where network hooks are located",
1502
2389
.group = 2 },
1503
2390
/*
1504
2391
* These reproduce what we would get without ARGP_NO_HELP
1523
2410
connect_to = arg;
1524
2411
break;
1525
2412
case 'i': /* --interface */
1526
interface = arg;
2413
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2414
arg, (int)',');
2415
if(ret_errno != 0){
2416
argp_error(state, "%s", strerror(ret_errno));
2417
}
1527
2418
break;
1528
2419
case 's': /* --seckey */
1529
2420
seckey = arg;
1540
2431
}
1541
2432
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1542
2433
break;
2434
case 134: /* --dh-params */
2435
dh_params_file = arg;
2436
break;
1543
2437
case 130: /* --priority */
1544
2438
mc.priority = arg;
1545
2439
break;
1558
2452
argp_error(state, "Bad retry interval");
1559
2453
}
1560
2454
break;
2455
case 133: /* --network-hook-dir */
2456
hookdir = arg;
2457
break;
1561
2458
/*
1562
2459
* These reproduce what we would get without ARGP_NO_HELP
1563
2460
*/
1569
2466
argp_state_help(state, state->out_stream,
1570
2467
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1571
2468
case 'V': /* --version */
1572
fprintf(state->out_stream, "%s\n", argp_program_version);
2469
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1573
2470
exit(argp_err_exit_status);
1574
2471
break;
1575
2472
default:
1582
2479
.args_doc = "",
1583
2480
.doc = "Mandos client -- Get and decrypt"
1584
2481
" passwords from a Mandos server" };
1585
ret = argp_parse(&argp, argc, argv,
1586
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1587
switch(ret){
2482
ret_errno = argp_parse(&argp, argc, argv,
2483
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2484
switch(ret_errno){
1588
2485
case 0:
1589
2486
break;
1590
2487
case ENOMEM:
1591
2488
default:
1592
errno = ret;
2489
errno = ret_errno;
1593
2490
perror_plus("argp_parse");
1594
2491
exitcode = EX_OSERR;
1595
2492
goto end;
1598
2495
goto end;
1599
2496
}
1600
2497
}
1601
2498
1602
2499
{
1603
2500
/* Work around Debian bug #633582:
1604
<http://bugs.debian.org/633582> */
1605
struct stat st;
1606
1607
/* Re-raise priviliges */
1608
errno = 0;
1609
ret = seteuid(0);
1610
if(ret == -1){
1611
perror_plus("seteuid");
1612
}
1613
1614
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1615
int seckey_fd = open(seckey, O_RDONLY);
1616
if(seckey_fd == -1){
1617
perror_plus("open");
1618
} else {
1619
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1620
if(ret == -1){
1621
perror_plus("fstat");
1622
} else {
1623
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1624
ret = fchown(seckey_fd, uid, gid);
1625
if(ret == -1){
1626
perror_plus("fchown");
1627
}
1628
}
1629
}
1630
TEMP_FAILURE_RETRY(close(seckey_fd));
1631
}
1632
}
1633
1634
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1635
int pubkey_fd = open(pubkey, O_RDONLY);
1636
if(pubkey_fd == -1){
1637
perror_plus("open");
1638
} else {
1639
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1640
if(ret == -1){
1641
perror_plus("fstat");
1642
} else {
1643
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1644
ret = fchown(pubkey_fd, uid, gid);
1645
if(ret == -1){
1646
perror_plus("fchown");
1647
}
1648
}
1649
}
1650
TEMP_FAILURE_RETRY(close(pubkey_fd));
1651
}
1652
}
1653
1654
/* Lower privileges */
1655
errno = 0;
1656
ret = seteuid(uid);
1657
if(ret == -1){
1658
perror_plus("seteuid");
1659
}
1660
}
1661
1662
/* Find network hooks and run them */
1663
{
1664
struct dirent **direntries;
1665
struct dirent *direntry;
1666
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1667
alphasort);
1668
int devnull = open("/dev/null", O_RDONLY);
1669
for(int i = 0; i < numhooks; i++){
1670
direntry = direntries[0];
1671
char *fullname = NULL;
1672
ret = asprintf(&fullname, "%s/%s", tempdir,
1673
direntry->d_name);
1674
if(ret < 0){
1675
perror_plus("asprintf");
1676
continue;
1677
}
1678
pid_t hook_pid = fork();
1679
if(hook_pid == 0){
1680
/* Child */
1681
dup2(devnull, STDIN_FILENO);
1682
close(devnull);
1683
dup2(STDERR_FILENO, STDOUT_FILENO);
1684
setenv("DEVICE", interface, 1);
1685
setenv("VERBOSE", debug ? "1" : "0", 1);
1686
setenv("MODE", "start", 1);
1687
/* setenv( XXX more here */
1688
ret = execl(fullname, direntry->d_name, "start");
1689
perror_plus("execl");
1690
}
1691
free(fullname);
1692
if(quit_now){
2501
<https://bugs.debian.org/633582> */
2502
2503
/* Re-raise privileges */
2504
ret = raise_privileges();
2505
if(ret != 0){
2506
errno = ret;
2507
perror_plus("Failed to raise privileges");
2508
} else {
2509
struct stat st;
2510
2511
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2512
int seckey_fd = open(seckey, O_RDONLY);
2513
if(seckey_fd == -1){
2514
perror_plus("open");
2515
} else {
2516
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2517
if(ret == -1){
2518
perror_plus("fstat");
2519
} else {
2520
if(S_ISREG(st.st_mode)
2521
and st.st_uid == 0 and st.st_gid == 0){
2522
ret = fchown(seckey_fd, uid, gid);
2523
if(ret == -1){
2524
perror_plus("fchown");
2525
}
2526
}
2527
}
2528
close(seckey_fd);
2529
}
2530
}
2531
2532
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2533
int pubkey_fd = open(pubkey, O_RDONLY);
2534
if(pubkey_fd == -1){
2535
perror_plus("open");
2536
} else {
2537
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2538
if(ret == -1){
2539
perror_plus("fstat");
2540
} else {
2541
if(S_ISREG(st.st_mode)
2542
and st.st_uid == 0 and st.st_gid == 0){
2543
ret = fchown(pubkey_fd, uid, gid);
2544
if(ret == -1){
2545
perror_plus("fchown");
2546
}
2547
}
2548
}
2549
close(pubkey_fd);
2550
}
2551
}
2552
2553
if(dh_params_file != NULL
2554
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2555
int dhparams_fd = open(dh_params_file, O_RDONLY);
2556
if(dhparams_fd == -1){
2557
perror_plus("open");
2558
} else {
2559
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2560
if(ret == -1){
2561
perror_plus("fstat");
2562
} else {
2563
if(S_ISREG(st.st_mode)
2564
and st.st_uid == 0 and st.st_gid == 0){
2565
ret = fchown(dhparams_fd, uid, gid);
2566
if(ret == -1){
2567
perror_plus("fchown");
2568
}
2569
}
2570
}
2571
close(dhparams_fd);
2572
}
2573
}
2574
2575
/* Lower privileges */
2576
ret = lower_privileges();
2577
if(ret != 0){
2578
errno = ret;
2579
perror_plus("Failed to lower privileges");
2580
}
2581
}
2582
}
2583
2584
/* Remove invalid interface names (except "none") */
2585
{
2586
char *interface = NULL;
2587
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2588
interface))){
2589
if(strcmp(interface, "none") != 0
2590
and if_nametoindex(interface) == 0){
2591
if(interface[0] != '\0'){
2592
fprintf_plus(stderr, "Not using nonexisting interface"
2593
" \"%s\"\n", interface);
2594
}
2595
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2596
interface = NULL;
2597
}
2598
}
2599
}
2600
2601
/* Run network hooks */
2602
{
2603
if(mc.interfaces != NULL){
2604
interfaces_hooks = malloc(mc.interfaces_size);
2605
if(interfaces_hooks == NULL){
2606
perror_plus("malloc");
1693
2607
goto end;
1694
2608
}
2609
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2610
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
1695
2611
}
1696
close(devnull);
2612
run_network_hooks("start", interfaces_hooks != NULL ?
2613
interfaces_hooks : "", delay);
1697
2614
}
1698
2615
1699
2616
if(not debug){
1700
2617
avahi_set_log_function(empty_log);
1701
2618
}
1702
2619
1703
if(interface[0] == '\0'){
1704
struct dirent **direntries;
1705
ret = scandir(sys_class_net, &direntries, good_interface,
1706
alphasort);
1707
if(ret >= 1){
1708
/* Pick the first good interface */
1709
interface = strdup(direntries[0]->d_name);
1710
if(debug){
1711
fprintf(stderr, "Using interface \"%s\"\n", interface);
1712
}
1713
if(interface == NULL){
1714
perror_plus("malloc");
1715
free(direntries);
1716
exitcode = EXIT_FAILURE;
1717
goto end;
1718
}
1719
free(direntries);
1720
} else {
1721
free(direntries);
1722
fprintf(stderr, "Could not find a network interface\n");
1723
exitcode = EXIT_FAILURE;
1724
goto end;
1725
}
1726
}
1727
1728
2620
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1729
2621
from the signal handler */
1730
2622
/* Initialize the pseudo-RNG for Avahi */
1731
2623
srand((unsigned int) time(NULL));
1732
mc.simple_poll = avahi_simple_poll_new();
1733
if(mc.simple_poll == NULL){
1734
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2624
simple_poll = avahi_simple_poll_new();
2625
if(simple_poll == NULL){
2626
fprintf_plus(stderr,
2627
"Avahi: Failed to create simple poll object.\n");
1735
2628
exitcode = EX_UNAVAILABLE;
1736
2629
goto end;
1737
2630
}
1799
2692
}
1800
2693
}
1801
2694
1802
/* If the interface is down, bring it up */
1803
if(strcmp(interface, "none") != 0){
1804
if_index = (AvahiIfIndex) if_nametoindex(interface);
1805
if(if_index == 0){
1806
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1807
exitcode = EX_UNAVAILABLE;
1808
goto end;
1809
}
1810
1811
if(quit_now){
1812
goto end;
1813
}
1814
1815
/* Re-raise priviliges */
1816
errno = 0;
1817
ret = seteuid(0);
1818
if(ret == -1){
1819
perror_plus("seteuid");
1820
}
1821
1822
#ifdef __linux__
1823
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1824
messages about the network interface to mess up the prompt */
1825
ret = klogctl(8, NULL, 5);
1826
bool restore_loglevel = true;
1827
if(ret == -1){
1828
restore_loglevel = false;
1829
perror_plus("klogctl");
1830
}
1831
#endif /* __linux__ */
1832
1833
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1834
if(sd < 0){
1835
perror_plus("socket");
1836
exitcode = EX_OSERR;
1837
#ifdef __linux__
1838
if(restore_loglevel){
1839
ret = klogctl(7, NULL, 0);
1840
if(ret == -1){
1841
perror_plus("klogctl");
1842
}
1843
}
1844
#endif /* __linux__ */
1845
/* Lower privileges */
1846
errno = 0;
1847
ret = seteuid(uid);
1848
if(ret == -1){
1849
perror_plus("seteuid");
1850
}
1851
goto end;
1852
}
1853
strcpy(network.ifr_name, interface);
1854
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1855
if(ret == -1){
1856
perror_plus("ioctl SIOCGIFFLAGS");
1857
#ifdef __linux__
1858
if(restore_loglevel){
1859
ret = klogctl(7, NULL, 0);
1860
if(ret == -1){
1861
perror_plus("klogctl");
1862
}
1863
}
1864
#endif /* __linux__ */
1865
exitcode = EX_OSERR;
1866
/* Lower privileges */
1867
errno = 0;
1868
ret = seteuid(uid);
1869
if(ret == -1){
1870
perror_plus("seteuid");
1871
}
1872
goto end;
1873
}
1874
if((network.ifr_flags & IFF_UP) == 0){
1875
network.ifr_flags |= IFF_UP;
1876
take_down_interface = true;
1877
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1878
if(ret == -1){
1879
take_down_interface = false;
1880
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1881
exitcode = EX_OSERR;
1882
#ifdef __linux__
1883
if(restore_loglevel){
1884
ret = klogctl(7, NULL, 0);
1885
if(ret == -1){
1886
perror_plus("klogctl");
2695
/* If no interfaces were specified, make a list */
2696
if(mc.interfaces == NULL){
2697
struct dirent **direntries = NULL;
2698
/* Look for any good interfaces */
2699
ret = scandir(sys_class_net, &direntries, good_interface,
2700
alphasort);
2701
if(ret >= 1){
2702
/* Add all found interfaces to interfaces list */
2703
for(int i = 0; i < ret; ++i){
2704
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2705
direntries[i]->d_name);
2706
if(ret_errno != 0){
2707
errno = ret_errno;
2708
perror_plus("argz_add");
2709
free(direntries[i]);
2710
continue;
2711
}
2712
if(debug){
2713
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2714
direntries[i]->d_name);
2715
}
2716
free(direntries[i]);
2717
}
2718
free(direntries);
2719
} else {
2720
if(ret == 0){
2721
free(direntries);
2722
}
2723
fprintf_plus(stderr, "Could not find a network interface\n");
2724
exitcode = EXIT_FAILURE;
2725
goto end;
2726
}
2727
}
2728
2729
/* Bring up interfaces which are down, and remove any "none"s */
2730
{
2731
char *interface = NULL;
2732
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2733
interface))){
2734
/* If interface name is "none", stop bringing up interfaces.
2735
Also remove all instances of "none" from the list */
2736
if(strcmp(interface, "none") == 0){
2737
argz_delete(&mc.interfaces, &mc.interfaces_size,
2738
interface);
2739
interface = NULL;
2740
while((interface = argz_next(mc.interfaces,
2741
mc.interfaces_size, interface))){
2742
if(strcmp(interface, "none") == 0){
2743
argz_delete(&mc.interfaces, &mc.interfaces_size,
2744
interface);
2745
interface = NULL;
1887
2746
}
1888
2747
}
1889
#endif /* __linux__ */
1890
/* Lower privileges */
1891
errno = 0;
1892
ret = seteuid(uid);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
goto end;
1897
}
1898
}
1899
/* Sleep checking until interface is running.
1900
Check every 0.25s, up to total time of delay */
1901
for(int i=0; i < delay * 4; i++){
1902
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1903
if(ret == -1){
1904
perror_plus("ioctl SIOCGIFFLAGS");
1905
} else if(network.ifr_flags & IFF_RUNNING){
1906
2748
break;
1907
2749
}
1908
struct timespec sleeptime = { .tv_nsec = 250000000 };
1909
ret = nanosleep(&sleeptime, NULL);
1910
if(ret == -1 and errno != EINTR){
1911
perror_plus("nanosleep");
1912
}
1913
}
1914
if(not take_down_interface){
1915
/* We won't need the socket anymore */
1916
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1917
if(ret == -1){
1918
perror_plus("close");
1919
}
1920
}
1921
#ifdef __linux__
1922
if(restore_loglevel){
1923
/* Restores kernel loglevel to default */
1924
ret = klogctl(7, NULL, 0);
1925
if(ret == -1){
1926
perror_plus("klogctl");
1927
}
1928
}
1929
#endif /* __linux__ */
1930
/* Lower privileges */
1931
errno = 0;
1932
if(take_down_interface){
1933
/* Lower privileges */
1934
ret = seteuid(uid);
1935
if(ret == -1){
1936
perror_plus("seteuid");
1937
}
1938
} else {
1939
/* Lower privileges permanently */
1940
ret = setuid(uid);
1941
if(ret == -1){
1942
perror_plus("setuid");
1943
}
1944
}
2750
bool interface_was_up = interface_is_up(interface);
2751
errno = bring_up_interface(interface, delay);
2752
if(not interface_was_up){
2753
if(errno != 0){
2754
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2755
" %s\n", interface, strerror(errno));
2756
} else {
2757
errno = argz_add(&interfaces_to_take_down,
2758
&interfaces_to_take_down_size,
2759
interface);
2760
if(errno != 0){
2761
perror_plus("argz_add");
2762
}
2763
}
2764
}
2765
}
2766
if(debug and (interfaces_to_take_down == NULL)){
2767
fprintf_plus(stderr, "No interfaces were brought up\n");
2768
}
2769
}
2770
2771
/* If we only got one interface, explicitly use only that one */
2772
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2773
if(debug){
2774
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2775
mc.interfaces);
2776
}
2777
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1945
2778
}
1946
2779
1947
2780
if(quit_now){
1948
2781
goto end;
1949
2782
}
1950
2783
1951
ret = init_gnutls_global(pubkey, seckey);
2784
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1952
2785
if(ret == -1){
1953
fprintf(stderr, "init_gnutls_global failed\n");
2786
fprintf_plus(stderr, "init_gnutls_global failed\n");
1954
2787
exitcode = EX_UNAVAILABLE;
1955
2788
goto end;
1956
2789
} else {
1961
2794
goto end;
1962
2795
}
1963
2796
1964
if(mkdtemp(tempdir) == NULL){
2797
/* Try /run/tmp before /tmp */
2798
tempdir = mkdtemp(run_tempdir);
2799
if(tempdir == NULL and errno == ENOENT){
2800
if(debug){
2801
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2802
run_tempdir, old_tempdir);
2803
}
2804
tempdir = mkdtemp(old_tempdir);
2805
}
2806
if(tempdir == NULL){
1965
2807
perror_plus("mkdtemp");
1966
2808
goto end;
1967
2809
}
1968
tempdir_created = true;
1969
2810
1970
2811
if(quit_now){
1971
2812
goto end;
1972
2813
}
1973
2814
1974
if(not init_gpgme(pubkey, seckey, tempdir)){
1975
fprintf(stderr, "init_gpgme failed\n");
2815
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2816
fprintf_plus(stderr, "init_gpgme failed\n");
1976
2817
exitcode = EX_UNAVAILABLE;
1977
2818
goto end;
1978
2819
} else {
1987
2828
/* Connect directly, do not use Zeroconf */
1988
2829
/* (Mainly meant for debugging) */
1989
2830
char *address = strrchr(connect_to, ':');
2831
1990
2832
if(address == NULL){
1991
fprintf(stderr, "No colon in address\n");
2833
fprintf_plus(stderr, "No colon in address\n");
1992
2834
exitcode = EX_USAGE;
1993
2835
goto end;
1994
2836
}
1997
2839
goto end;
1998
2840
}
1999
2841
2000
uint16_t port;
2842
in_port_t port;
2001
2843
errno = 0;
2002
2844
tmpmax = strtoimax(address+1, &tmp, 10);
2003
2845
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2004
or tmpmax != (uint16_t)tmpmax){
2005
fprintf(stderr, "Bad port number\n");
2846
or tmpmax != (in_port_t)tmpmax){
2847
fprintf_plus(stderr, "Bad port number\n");
2006
2848
exitcode = EX_USAGE;
2007
2849
goto end;
2008
2850
}
2009
2851
2010
2852
if(quit_now){
2011
2853
goto end;
2012
2854
}
2013
2855
2014
port = (uint16_t)tmpmax;
2856
port = (in_port_t)tmpmax;
2015
2857
*address = '\0';
2016
2858
/* Colon in address indicates IPv6 */
2017
2859
int af;
2033
2875
}
2034
2876
2035
2877
while(not quit_now){
2036
ret = start_mandos_communication(address, port, if_index, af);
2878
ret = start_mandos_communication(address, port, if_index, af,
2879
&mc);
2037
2880
if(quit_now or ret == 0){
2038
2881
break;
2039
2882
}
2040
2883
if(debug){
2041
fprintf(stderr, "Retrying in %d seconds\n",
2042
(int)retry_interval);
2884
fprintf_plus(stderr, "Retrying in %d seconds\n",
2885
(int)retry_interval);
2043
2886
}
2044
sleep((int)retry_interval);
2887
sleep((unsigned int)retry_interval);
2045
2888
}
2046
2889
2047
if (not quit_now){
2890
if(not quit_now){
2048
2891
exitcode = EXIT_SUCCESS;
2049
2892
}
2050
2893
2065
2908
config.publish_domain = 0;
2066
2909
2067
2910
/* Allocate a new server */
2068
mc.server = avahi_server_new(avahi_simple_poll_get
2069
(mc.simple_poll), &config, NULL,
2070
NULL, &error);
2911
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2912
&config, NULL, NULL, &ret);
2071
2913
2072
2914
/* Free the Avahi configuration data */
2073
2915
avahi_server_config_free(&config);
2075
2917
2076
2918
/* Check if creating the Avahi server object succeeded */
2077
2919
if(mc.server == NULL){
2078
fprintf(stderr, "Failed to create Avahi server: %s\n",
2079
avahi_strerror(error));
2920
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2921
avahi_strerror(ret));
2080
2922
exitcode = EX_UNAVAILABLE;
2081
2923
goto end;
2082
2924
}
2088
2930
/* Create the Avahi service browser */
2089
2931
sb = avahi_s_service_browser_new(mc.server, if_index,
2090
2932
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2091
NULL, 0, browse_callback, NULL);
2933
NULL, 0, browse_callback,
2934
(void *)&mc);
2092
2935
if(sb == NULL){
2093
fprintf(stderr, "Failed to create service browser: %s\n",
2094
avahi_strerror(avahi_server_errno(mc.server)));
2936
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2937
avahi_strerror(avahi_server_errno(mc.server)));
2095
2938
exitcode = EX_UNAVAILABLE;
2096
2939
goto end;
2097
2940
}
2103
2946
/* Run the main loop */
2104
2947
2105
2948
if(debug){
2106
fprintf(stderr, "Starting Avahi loop search\n");
2949
fprintf_plus(stderr, "Starting Avahi loop search\n");
2107
2950
}
2108
2109
ret = avahi_loop_with_timeout(mc.simple_poll,
2110
(int)(retry_interval * 1000));
2951
2952
ret = avahi_loop_with_timeout(simple_poll,
2953
(int)(retry_interval * 1000), &mc);
2111
2954
if(debug){
2112
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2113
(ret == 0) ? "successfully" : "with error");
2955
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2956
(ret == 0) ? "successfully" : "with error");
2114
2957
}
2115
2958
2116
2959
end:
2117
2960
2118
2961
if(debug){
2119
fprintf(stderr, "%s exiting\n", argv[0]);
2962
if(signal_received){
2963
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2964
argv[0], signal_received,
2965
strsignal(signal_received));
2966
} else {
2967
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2968
}
2120
2969
}
2121
2970
2122
2971
/* Cleanup things */
2972
free(mc.interfaces);
2973
2123
2974
if(sb != NULL)
2124
2975
avahi_s_service_browser_free(sb);
2125
2976
2126
2977
if(mc.server != NULL)
2127
2978
avahi_server_free(mc.server);
2128
2979
2129
if(mc.simple_poll != NULL)
2130
avahi_simple_poll_free(mc.simple_poll);
2980
if(simple_poll != NULL)
2981
avahi_simple_poll_free(simple_poll);
2131
2982
2132
2983
if(gnutls_initialized){
2133
2984
gnutls_certificate_free_credentials(mc.cred);
2134
gnutls_global_deinit();
2135
2985
gnutls_dh_params_deinit(mc.dh_params);
2136
2986
}
2137
2987
2138
2988
if(gpgme_initialized){
2139
2989
gpgme_release(mc.ctx);
2140
2990
}
2141
2991
2142
2992
/* Cleans up the circular linked list of Mandos servers the client
2143
2993
has seen */
2144
2994
if(mc.current_server != NULL){
2145
2995
mc.current_server->prev->next = NULL;
2146
2996
while(mc.current_server != NULL){
2147
2997
server *next = mc.current_server->next;
2998
#ifdef __GNUC__
2999
#pragma GCC diagnostic push
3000
#pragma GCC diagnostic ignored "-Wcast-qual"
3001
#endif
3002
free((char *)(mc.current_server->ip));
3003
#ifdef __GNUC__
3004
#pragma GCC diagnostic pop
3005
#endif
2148
3006
free(mc.current_server);
2149
3007
mc.current_server = next;
2150
3008
}
2151
3009
}
2152
3010
2153
/* XXX run network hooks "stop" here */
2154
2155
/* Take down the network interface */
2156
if(take_down_interface){
2157
/* Re-raise priviliges */
2158
errno = 0;
2159
ret = seteuid(0);
2160
if(ret == -1){
2161
perror_plus("seteuid");
2162
}
2163
if(geteuid() == 0){
2164
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2165
if(ret == -1){
2166
perror_plus("ioctl SIOCGIFFLAGS");
2167
} else if(network.ifr_flags & IFF_UP) {
2168
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2169
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2170
if(ret == -1){
2171
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2172
}
2173
}
2174
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2175
if(ret == -1){
2176
perror_plus("close");
2177
}
2178
/* Lower privileges permanently */
2179
errno = 0;
2180
ret = setuid(uid);
2181
if(ret == -1){
2182
perror_plus("setuid");
2183
}
2184
}
3011
/* Re-raise privileges */
3012
{
3013
ret = raise_privileges();
3014
if(ret != 0){
3015
errno = ret;
3016
perror_plus("Failed to raise privileges");
3017
} else {
3018
3019
/* Run network hooks */
3020
run_network_hooks("stop", interfaces_hooks != NULL ?
3021
interfaces_hooks : "", delay);
3022
3023
/* Take down the network interfaces which were brought up */
3024
{
3025
char *interface = NULL;
3026
while((interface = argz_next(interfaces_to_take_down,
3027
interfaces_to_take_down_size,
3028
interface))){
3029
ret = take_down_interface(interface);
3030
if(ret != 0){
3031
errno = ret;
3032
perror_plus("Failed to take down interface");
3033
}
3034
}
3035
if(debug and (interfaces_to_take_down == NULL)){
3036
fprintf_plus(stderr, "No interfaces needed to be taken"
3037
" down\n");
3038
}
3039
}
3040
}
3041
3042
ret = lower_privileges_permanently();
3043
if(ret != 0){
3044
errno = ret;
3045
perror_plus("Failed to lower privileges permanently");
3046
}
3047
}
3048
3049
free(interfaces_to_take_down);
3050
free(interfaces_hooks);
3051
3052
void clean_dir_at(int base, const char * const dirname,
3053
uintmax_t level){
3054
struct dirent **direntries = NULL;
3055
int dret;
3056
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3057
O_RDONLY
3058
| O_NOFOLLOW
3059
| O_DIRECTORY
3060
| O_PATH));
3061
if(dir_fd == -1){
3062
perror_plus("open");
3063
}
3064
int numentries = scandirat(dir_fd, ".", &direntries,
3065
notdotentries, alphasort);
3066
if(numentries >= 0){
3067
for(int i = 0; i < numentries; i++){
3068
if(debug){
3069
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3070
dirname, direntries[i]->d_name);
3071
}
3072
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3073
if(dret == -1){
3074
if(errno == EISDIR){
3075
dret = unlinkat(dir_fd, direntries[i]->d_name,
3076
AT_REMOVEDIR);
3077
}
3078
if((dret == -1) and (errno == ENOTEMPTY)
3079
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3080
== 0) and (level == 0)){
3081
/* Recurse only in this special case */
3082
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3083
dret = 0;
3084
}
3085
if(dret == -1){
3086
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3087
direntries[i]->d_name, strerror(errno));
3088
}
3089
}
3090
free(direntries[i]);
3091
}
3092
3093
/* need to clean even if 0 because man page doesn't specify */
3094
free(direntries);
3095
if(numentries == -1){
3096
perror_plus("scandirat");
3097
}
3098
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3099
if(dret == -1 and errno != ENOENT){
3100
perror_plus("rmdir");
3101
}
3102
} else {
3103
perror_plus("scandirat");
3104
}
3105
close(dir_fd);
2185
3106
}
2186
3107
2187
3108
/* Removes the GPGME temp directory and all files inside */
2188
if(tempdir_created){
2189
struct dirent **direntries = NULL;
2190
struct dirent *direntry = NULL;
2191
int numentries = scandir(tempdir, &direntries, notdotentries,
2192
alphasort);
2193
if (numentries > 0){
2194
for(int i = 0; i < numentries; i++){
2195
direntry = direntries[i];
2196
char *fullname = NULL;
2197
ret = asprintf(&fullname, "%s/%s", tempdir,
2198
direntry->d_name);
2199
if(ret < 0){
2200
perror_plus("asprintf");
2201
continue;
2202
}
2203
ret = remove(fullname);
2204
if(ret == -1){
2205
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2206
strerror(errno));
2207
}
2208
free(fullname);
2209
}
2210
}
2211
2212
/* need to clean even if 0 because man page doesn't specify */
2213
free(direntries);
2214
if (numentries == -1){
2215
perror_plus("scandir");
2216
}
2217
ret = rmdir(tempdir);
2218
if(ret == -1 and errno != ENOENT){
2219
perror_plus("rmdir");
2220
}
3109
if(tempdir != NULL){
3110
clean_dir_at(-1, tempdir, 0);
2221
3111
}
2222
3112
2223
3113
if(quit_now){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0