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- Committer: Teddy Hogeborn
- Date: 2015-07-20 03:03:33 UTC
- Revision ID: teddy@recompile.se-20150720030333-203m2aeblypcsfte
Bug fix for GnuTLS 3: be compatible with old 2048-bit DSA keys.
The mandos-keygen program in Mandos version 1.6.0 and older generated
2048-bit DSA keys, and when GnuTLS uses these it has trouble
connecting using the Mandos default priority string. This was
previously fixed in Mandos 1.6.2, but the bug reappeared when using
GnuTLS 3, so the default priority string has to change again; this
time also the Mandos client has to change its default, so now the
server and the client should use the same default priority string:
SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256
* mandos (main/server_defaults): Changed default priority string.
* mandos-options.xml (/section/para[id="priority_compat"]): Removed.
(/section/para[id="priority"]): Changed default priority string.
* mandos.conf ([DEFAULT]/priority): - '' -
* mandos.conf.xml (OPTIONS/priority): Refer to the id "priority"
instead of "priority_compat".
* mandos.xml (OPTIONS/--priority): - '' -
* plugins.d/mandos-client.c (main): Changed default priority string.
The mandos-keygen program in Mandos version 1.6.0 and older generated
2048-bit DSA keys, and when GnuTLS uses these it has trouble
connecting using the Mandos default priority string. This was
previously fixed in Mandos 1.6.2, but the bug reappeared when using
GnuTLS 3, so the default priority string has to change again; this
time also the Mandos client has to change its default, so now the
server and the client should use the same default priority string:
SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256
* mandos (main/server_defaults): Changed default priority string.
* mandos-options.xml (/section/para[id="priority_compat"]): Removed.
(/section/para[id="priority"]): Changed default priority string.
* mandos.conf ([DEFAULT]/priority): - '' -
* mandos.conf.xml (OPTIONS/priority): Refer to the id "priority"
instead of "priority_compat".
* mandos.xml (OPTIONS/--priority): - '' -
* plugins.d/mandos-client.c (main): Changed default priority string.
- files added:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2015 Teddy Hogeborn
13
* Copyright © 2008-2015 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
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
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
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(), strcpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
55
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
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*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
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strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
67
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
69
SIOCSIFFLAGS, if_indextoname(),
69
70
if_nametoindex(), IF_NAMESIZE */
72
73
*/
73
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
77
79
#include <iso646.h> /* not, or, and */
78
80
#include <argp.h> /* struct argp_option, error_t, struct
79
81
argp_state, struct argp,
82
84
#include <signal.h> /* sigemptyset(), sigaddset(),
83
85
sigaction(), SIGTERM, sig_atomic_t,
84
86
raise() */
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
85
98
86
99
#ifdef __linux__
87
100
#include <sys/klog.h> /* klogctl() */
105
118
init_gnutls_session(),
106
119
GNUTLS_* */
107
120
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
110
123
111
124
/* GPGME */
112
125
#include <gpgme.h> /* All GPGME types, constants and
120
133
#define PATHDIR "/conf/conf.d/mandos"
121
134
#define SECKEY "seckey.txt"
122
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
123
137
124
138
bool debug = false;
125
139
static const char mandos_protocol_version[] = "1";
126
140
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
151
const char *ip;
152
in_port_t port;
153
AvahiIfIndex if_index;
154
int af;
155
struct timespec last_seen;
156
struct server *next;
157
struct server *prev;
158
} server;
128
159
129
160
/* Used for passing in values through the Avahi callback functions */
130
161
typedef struct {
131
AvahiSimplePoll *simple_poll;
132
162
AvahiServer *server;
133
163
gnutls_certificate_credentials_t cred;
134
164
unsigned int dh_bits;
135
165
gnutls_dh_params_t dh_params;
136
166
const char *priority;
137
167
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
138
171
} mandos_context;
139
172
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
144
175
145
176
sig_atomic_t quit_now = 0;
146
177
int signal_received = 0;
147
178
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
181
int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
184
errno = e;
185
perror(print_text);
186
}
187
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
148
198
/*
149
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
150
200
* bytes. "buffer_capacity" is how much is currently allocated,
151
201
* "buffer_length" is how much is already used.
152
202
*/
203
__attribute__((nonnull, warn_unused_result))
153
204
size_t incbuffer(char **buffer, size_t buffer_length,
154
size_t buffer_capacity){
205
size_t buffer_capacity){
155
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
156
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
157
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
158
213
return 0;
159
214
}
215
*buffer = new_buf;
160
216
buffer_capacity += BUFFER_SIZE;
161
217
}
162
218
return buffer_capacity;
163
219
}
164
220
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
229
return false;
230
}
231
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
253
}
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
259
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
267
}
268
165
269
/*
166
270
* Initialize GPGME.
167
271
*/
168
static bool init_gpgme(const char *seckey,
169
const char *pubkey, const char *tempdir){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
170
277
gpgme_error_t rc;
171
278
gpgme_engine_info_t engine_info;
172
279
173
174
280
/*
175
281
* Helper function to insert pub and seckey to the engine keyring.
176
282
*/
177
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
178
284
int ret;
179
285
int fd;
180
286
gpgme_data_t pgp_data;
181
287
182
288
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
183
289
if(fd == -1){
184
perror("open");
290
perror_plus("open");
185
291
return false;
186
292
}
187
293
188
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
189
295
if(rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
192
298
return false;
193
299
}
194
300
195
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
196
302
if(rc != GPG_ERR_NO_ERROR){
197
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
198
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
199
305
return false;
200
306
}
201
307
202
ret = (int)TEMP_FAILURE_RETRY(close(fd));
308
ret = close(fd);
203
309
if(ret == -1){
204
perror("close");
310
perror_plus("close");
205
311
}
206
312
gpgme_data_release(pgp_data);
207
313
return true;
208
314
}
209
315
210
316
if(debug){
211
fprintf(stderr, "Initializing GPGME\n");
317
fprintf_plus(stderr, "Initializing GPGME\n");
212
318
}
213
319
214
320
/* Init GPGME */
215
321
gpgme_check_version(NULL);
216
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
217
323
if(rc != GPG_ERR_NO_ERROR){
218
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
219
gpgme_strsource(rc), gpgme_strerror(rc));
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
220
326
return false;
221
327
}
222
328
223
/* Set GPGME home directory for the OpenPGP engine only */
329
/* Set GPGME home directory for the OpenPGP engine only */
224
330
rc = gpgme_get_engine_info(&engine_info);
225
331
if(rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
228
334
return false;
229
335
}
230
336
while(engine_info != NULL){
236
342
engine_info = engine_info->next;
237
343
}
238
344
if(engine_info == NULL){
239
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
240
347
return false;
241
348
}
242
349
243
350
/* Create new GPGME "context" */
244
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
245
352
if(rc != GPG_ERR_NO_ERROR){
246
fprintf(stderr, "bad gpgme_new: %s: %s\n",
247
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
248
356
return false;
249
357
}
250
358
259
367
* Decrypt OpenPGP data.
260
368
* Returns -1 on error
261
369
*/
370
__attribute__((nonnull, warn_unused_result))
262
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
263
372
size_t crypto_size,
264
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
265
375
gpgme_data_t dh_crypto, dh_plain;
266
376
gpgme_error_t rc;
267
377
ssize_t ret;
269
379
ssize_t plaintext_length = 0;
270
380
271
381
if(debug){
272
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
273
383
}
274
384
275
385
/* Create new GPGME data buffer from memory cryptotext */
276
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
277
387
0);
278
388
if(rc != GPG_ERR_NO_ERROR){
279
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
281
391
return -1;
282
392
}
283
393
284
394
/* Create new empty GPGME data buffer for the plaintext */
285
395
rc = gpgme_data_new(&dh_plain);
286
396
if(rc != GPG_ERR_NO_ERROR){
287
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
288
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
289
400
gpgme_data_release(dh_crypto);
290
401
return -1;
291
402
}
292
403
293
404
/* Decrypt data from the cryptotext data buffer to the plaintext
294
405
data buffer */
295
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
296
407
if(rc != GPG_ERR_NO_ERROR){
297
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
299
410
plaintext_length = -1;
300
411
if(debug){
301
412
gpgme_decrypt_result_t result;
302
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
303
414
if(result == NULL){
304
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
305
416
} else {
306
fprintf(stderr, "Unsupported algorithm: %s\n",
307
result->unsupported_algorithm);
308
fprintf(stderr, "Wrong key usage: %u\n",
309
result->wrong_key_usage);
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
310
421
if(result->file_name != NULL){
311
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
312
423
}
313
424
gpgme_recipient_t recipient;
314
425
recipient = result->recipients;
315
426
while(recipient != NULL){
316
fprintf(stderr, "Public key algorithm: %s\n",
317
gpgme_pubkey_algo_name(recipient->pubkey_algo));
318
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
319
fprintf(stderr, "Secret key available: %s\n",
320
recipient->status == GPG_ERR_NO_SECKEY
321
? "No" : "Yes");
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
322
434
recipient = recipient->next;
323
435
}
324
436
}
327
439
}
328
440
329
441
if(debug){
330
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
331
443
}
332
444
333
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
334
446
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
335
perror("gpgme_data_seek");
447
perror_plus("gpgme_data_seek");
336
448
plaintext_length = -1;
337
449
goto decrypt_end;
338
450
}
340
452
*plaintext = NULL;
341
453
while(true){
342
454
plaintext_capacity = incbuffer(plaintext,
343
(size_t)plaintext_length,
344
plaintext_capacity);
455
(size_t)plaintext_length,
456
plaintext_capacity);
345
457
if(plaintext_capacity == 0){
346
perror("incbuffer");
347
plaintext_length = -1;
348
goto decrypt_end;
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
349
461
}
350
462
351
463
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
356
468
break;
357
469
}
358
470
if(ret < 0){
359
perror("gpgme_data_read");
471
perror_plus("gpgme_data_read");
360
472
plaintext_length = -1;
361
473
goto decrypt_end;
362
474
}
364
476
}
365
477
366
478
if(debug){
367
fprintf(stderr, "Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
368
480
for(ssize_t i = 0; i < plaintext_length; i++){
369
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
370
482
}
381
493
return plaintext_length;
382
494
}
383
495
384
static const char * safer_gnutls_strerror(int value){
385
const char *ret = gnutls_strerror(value); /* Spurious warning from
386
-Wunreachable-code */
387
if(ret == NULL)
388
ret = "(unknown)";
389
return ret;
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
390
507
}
391
508
392
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
393
511
static void debuggnutls(__attribute__((unused)) int level,
394
512
const char* string){
395
fprintf(stderr, "GnuTLS: %s", string);
513
fprintf_plus(stderr, "GnuTLS: %s", string);
396
514
}
397
515
516
__attribute__((nonnull, warn_unused_result))
398
517
static int init_gnutls_global(const char *pubkeyfilename,
399
const char *seckeyfilename){
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
400
521
int ret;
522
unsigned int uret;
401
523
402
524
if(debug){
403
fprintf(stderr, "Initializing GnuTLS\n");
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
404
526
}
405
527
406
528
ret = gnutls_global_init();
407
529
if(ret != GNUTLS_E_SUCCESS){
408
fprintf(stderr, "GnuTLS global_init: %s\n",
409
safer_gnutls_strerror(ret));
530
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
531
safer_gnutls_strerror(ret));
410
532
return -1;
411
533
}
412
534
419
541
}
420
542
421
543
/* OpenPGP credentials */
422
gnutls_certificate_allocate_credentials(&mc.cred);
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
423
545
if(ret != GNUTLS_E_SUCCESS){
424
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
from
426
-Wunreachable-code
427
*/
428
safer_gnutls_strerror(ret));
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
safer_gnutls_strerror(ret));
429
548
gnutls_global_deinit();
430
549
return -1;
431
550
}
432
551
433
552
if(debug){
434
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
435
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
436
seckeyfilename);
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
555
pubkeyfilename,
556
seckeyfilename);
437
557
}
438
558
439
559
ret = gnutls_certificate_set_openpgp_key_file
440
(mc.cred, pubkeyfilename, seckeyfilename,
560
(mc->cred, pubkeyfilename, seckeyfilename,
441
561
GNUTLS_OPENPGP_FMT_BASE64);
442
562
if(ret != GNUTLS_E_SUCCESS){
443
fprintf(stderr,
444
"Error[%d] while reading the OpenPGP key pair ('%s',"
445
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
446
fprintf(stderr, "The GnuTLS error is: %s\n",
447
safer_gnutls_strerror(ret));
563
fprintf_plus(stderr,
564
"Error[%d] while reading the OpenPGP key pair ('%s',"
565
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
566
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
567
safer_gnutls_strerror(ret));
448
568
goto globalfail;
449
569
}
450
570
451
571
/* GnuTLS server initialization */
452
ret = gnutls_dh_params_init(&mc.dh_params);
453
if(ret != GNUTLS_E_SUCCESS){
454
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
455
" %s\n", safer_gnutls_strerror(ret));
456
goto globalfail;
457
}
458
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
459
if(ret != GNUTLS_E_SUCCESS){
460
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
461
safer_gnutls_strerror(ret));
462
goto globalfail;
463
}
464
465
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
572
ret = gnutls_dh_params_init(&mc->dh_params);
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
" initialization: %s\n",
576
safer_gnutls_strerror(ret));
577
goto globalfail;
578
}
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
if(params.data == NULL){
619
dhparamsfilename = NULL;
620
}
621
if(dhparamsfilename == NULL){
622
break;
623
}
624
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
625
GNUTLS_X509_FMT_PEM);
626
if(ret != GNUTLS_E_SUCCESS){
627
fprintf_plus(stderr, "Failed to parse DH parameters in file"
628
" \"%s\": %s\n", dhparamsfilename,
629
safer_gnutls_strerror(ret));
630
dhparamsfilename = NULL;
631
}
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
466
752
467
753
return 0;
468
754
469
755
globalfail:
470
756
471
gnutls_certificate_free_credentials(mc.cred);
757
gnutls_certificate_free_credentials(mc->cred);
472
758
gnutls_global_deinit();
473
gnutls_dh_params_deinit(mc.dh_params);
759
gnutls_dh_params_deinit(mc->dh_params);
474
760
return -1;
475
761
}
476
762
477
static int init_gnutls_session(gnutls_session_t *session){
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
765
mandos_context *mc){
478
766
int ret;
479
767
/* GnuTLS session creation */
480
768
do {
484
772
}
485
773
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
486
774
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
488
safer_gnutls_strerror(ret));
775
fprintf_plus(stderr,
776
"Error in GnuTLS session initialization: %s\n",
777
safer_gnutls_strerror(ret));
489
778
}
490
779
491
780
{
492
781
const char *err;
493
782
do {
494
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
495
784
if(quit_now){
496
785
gnutls_deinit(*session);
497
786
return -1;
498
787
}
499
788
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
500
789
if(ret != GNUTLS_E_SUCCESS){
501
fprintf(stderr, "Syntax error at: %s\n", err);
502
fprintf(stderr, "GnuTLS error: %s\n",
503
safer_gnutls_strerror(ret));
790
fprintf_plus(stderr, "Syntax error at: %s\n", err);
791
fprintf_plus(stderr, "GnuTLS error: %s\n",
792
safer_gnutls_strerror(ret));
504
793
gnutls_deinit(*session);
505
794
return -1;
506
795
}
508
797
509
798
do {
510
799
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
511
mc.cred);
800
mc->cred);
512
801
if(quit_now){
513
802
gnutls_deinit(*session);
514
803
return -1;
515
804
}
516
805
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
517
806
if(ret != GNUTLS_E_SUCCESS){
518
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
519
safer_gnutls_strerror(ret));
807
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
808
safer_gnutls_strerror(ret));
520
809
gnutls_deinit(*session);
521
810
return -1;
522
811
}
524
813
/* ignore client certificate if any. */
525
814
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
526
815
527
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
528
529
816
return 0;
530
817
}
531
818
533
820
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
534
821
__attribute__((unused)) const char *txt){}
535
822
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
829
ret_errno = errno;
830
}
831
errno = old_errno;
832
return ret_errno;
833
}
834
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
841
errno = old_errno;
842
return ret_errno;
843
}
844
if(setuid(0) == -1){
845
ret_errno = errno;
846
}
847
errno = old_errno;
848
return ret_errno;
849
}
850
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
857
ret_errno = errno;
858
}
859
errno = old_errno;
860
return ret_errno;
861
}
862
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
869
ret_errno = errno;
870
}
871
errno = old_errno;
872
return ret_errno;
873
}
874
875
/* Helper function to add_local_route() and delete_local_route() */
876
__attribute__((nonnull, warn_unused_result))
877
static bool add_delete_local_route(const bool add,
878
const char *address,
879
AvahiIfIndex if_index){
880
int ret;
881
char helper[] = "mandos-client-iprouteadddel";
882
char add_arg[] = "add";
883
char delete_arg[] = "delete";
884
char debug_flag[] = "--debug";
885
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
886
if(pluginhelperdir == NULL){
887
if(debug){
888
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
889
" variable not set; cannot run helper\n");
890
}
891
return false;
892
}
893
894
char interface[IF_NAMESIZE];
895
if(if_indextoname((unsigned int)if_index, interface) == NULL){
896
perror_plus("if_indextoname");
897
return false;
898
}
899
900
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
901
if(devnull == -1){
902
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
return false;
904
}
905
pid_t pid = fork();
906
if(pid == 0){
907
/* Child */
908
/* Raise privileges */
909
errno = raise_privileges_permanently();
910
if(errno != 0){
911
perror_plus("Failed to raise privileges");
912
/* _exit(EX_NOPERM); */
913
} else {
914
/* Set group */
915
errno = 0;
916
ret = setgid(0);
917
if(ret == -1){
918
perror_plus("setgid");
919
_exit(EX_NOPERM);
920
}
921
/* Reset supplementary groups */
922
errno = 0;
923
ret = setgroups(0, NULL);
924
if(ret == -1){
925
perror_plus("setgroups");
926
_exit(EX_NOPERM);
927
}
928
}
929
ret = dup2(devnull, STDIN_FILENO);
930
if(ret == -1){
931
perror_plus("dup2(devnull, STDIN_FILENO)");
932
_exit(EX_OSERR);
933
}
934
ret = close(devnull);
935
if(ret == -1){
936
perror_plus("close");
937
_exit(EX_OSERR);
938
}
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
940
if(ret == -1){
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
942
_exit(EX_OSERR);
943
}
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
945
O_RDONLY
946
| O_DIRECTORY
947
| O_PATH
948
| O_CLOEXEC));
949
if(helperdir_fd == -1){
950
perror_plus("open");
951
_exit(EX_UNAVAILABLE);
952
}
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
954
helper, O_RDONLY));
955
if(helper_fd == -1){
956
perror_plus("openat");
957
close(helperdir_fd);
958
_exit(EX_UNAVAILABLE);
959
}
960
close(helperdir_fd);
961
#ifdef __GNUC__
962
#pragma GCC diagnostic push
963
#pragma GCC diagnostic ignored "-Wcast-qual"
964
#endif
965
if(fexecve(helper_fd, (char *const [])
966
{ helper, add ? add_arg : delete_arg, (char *)address,
967
interface, debug ? debug_flag : NULL, NULL },
968
environ) == -1){
969
#ifdef __GNUC__
970
#pragma GCC diagnostic pop
971
#endif
972
perror_plus("fexecve");
973
_exit(EXIT_FAILURE);
974
}
975
}
976
if(pid == -1){
977
perror_plus("fork");
978
return false;
979
}
980
int status;
981
pid_t pret = -1;
982
errno = 0;
983
do {
984
pret = waitpid(pid, &status, 0);
985
if(pret == -1 and errno == EINTR and quit_now){
986
int errno_raising = 0;
987
if((errno = raise_privileges()) != 0){
988
errno_raising = errno;
989
perror_plus("Failed to raise privileges in order to"
990
" kill helper program");
991
}
992
if(kill(pid, SIGTERM) == -1){
993
perror_plus("kill");
994
}
995
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
996
perror_plus("Failed to lower privileges after killing"
997
" helper program");
998
}
999
return false;
1000
}
1001
} while(pret == -1 and errno == EINTR);
1002
if(pret == -1){
1003
perror_plus("waitpid");
1004
return false;
1005
}
1006
if(WIFEXITED(status)){
1007
if(WEXITSTATUS(status) != 0){
1008
fprintf_plus(stderr, "Error: iprouteadddel exited"
1009
" with status %d\n", WEXITSTATUS(status));
1010
return false;
1011
}
1012
return true;
1013
}
1014
if(WIFSIGNALED(status)){
1015
fprintf_plus(stderr, "Error: iprouteadddel died by"
1016
" signal %d\n", WTERMSIG(status));
1017
return false;
1018
}
1019
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1020
return false;
1021
}
1022
1023
__attribute__((nonnull, warn_unused_result))
1024
static bool add_local_route(const char *address,
1025
AvahiIfIndex if_index){
1026
if(debug){
1027
fprintf_plus(stderr, "Adding route to %s\n", address);
1028
}
1029
return add_delete_local_route(true, address, if_index);
1030
}
1031
1032
__attribute__((nonnull, warn_unused_result))
1033
static bool delete_local_route(const char *address,
1034
AvahiIfIndex if_index){
1035
if(debug){
1036
fprintf_plus(stderr, "Removing route to %s\n", address);
1037
}
1038
return add_delete_local_route(false, address, if_index);
1039
}
1040
536
1041
/* Called when a Mandos server is found */
537
static int start_mandos_communication(const char *ip, uint16_t port,
1042
__attribute__((nonnull, warn_unused_result))
1043
static int start_mandos_communication(const char *ip, in_port_t port,
538
1044
AvahiIfIndex if_index,
539
int af){
1045
int af, mandos_context *mc){
540
1046
int ret, tcp_sd = -1;
541
1047
ssize_t sret;
542
union {
543
struct sockaddr_in in;
544
struct sockaddr_in6 in6;
545
} to;
1048
struct sockaddr_storage to;
546
1049
char *buffer = NULL;
547
1050
char *decrypted_buffer = NULL;
548
1051
size_t buffer_length = 0;
551
1054
int retval = -1;
552
1055
gnutls_session_t session;
553
1056
int pf; /* Protocol family */
1057
bool route_added = false;
1058
1059
errno = 0;
554
1060
555
1061
if(quit_now){
1062
errno = EINTR;
556
1063
return -1;
557
1064
}
558
1065
564
1071
pf = PF_INET;
565
1072
break;
566
1073
default:
567
fprintf(stderr, "Bad address family: %d\n", af);
1074
fprintf_plus(stderr, "Bad address family: %d\n", af);
1075
errno = EINVAL;
568
1076
return -1;
569
1077
}
570
1078
571
ret = init_gnutls_session(&session);
1079
/* If the interface is specified and we have a list of interfaces */
1080
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1081
/* Check if the interface is one of the interfaces we are using */
1082
bool match = false;
1083
{
1084
char *interface = NULL;
1085
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1086
interface))){
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1088
match = true;
1089
break;
1090
}
1091
}
1092
}
1093
if(not match){
1094
/* This interface does not match any in the list, so we don't
1095
connect to the server */
1096
if(debug){
1097
char interface[IF_NAMESIZE];
1098
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1099
perror_plus("if_indextoname");
1100
} else {
1101
fprintf_plus(stderr, "Skipping server on non-used interface"
1102
" \"%s\"\n",
1103
if_indextoname((unsigned int)if_index,
1104
interface));
1105
}
1106
}
1107
return -1;
1108
}
1109
}
1110
1111
ret = init_gnutls_session(&session, mc);
572
1112
if(ret != 0){
573
1113
return -1;
574
1114
}
575
1115
576
1116
if(debug){
577
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
578
"\n", ip, port);
1117
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1118
PRIuMAX "\n", ip, (uintmax_t)port);
579
1119
}
580
1120
581
tcp_sd = socket(pf, SOCK_STREAM, 0);
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
582
1122
if(tcp_sd < 0){
583
perror("socket");
1123
int e = errno;
1124
perror_plus("socket");
1125
errno = e;
584
1126
goto mandos_end;
585
1127
}
586
1128
587
1129
if(quit_now){
1130
errno = EINTR;
588
1131
goto mandos_end;
589
1132
}
590
1133
591
memset(&to, 0, sizeof(to));
592
1134
if(af == AF_INET6){
593
to.in6.sin6_family = (sa_family_t)af;
594
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
595
1138
} else { /* IPv4 */
596
to.in.sin_family = (sa_family_t)af;
597
ret = inet_pton(af, ip, &to.in.sin_addr);
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
598
1142
}
599
1143
if(ret < 0 ){
600
perror("inet_pton");
1144
int e = errno;
1145
perror_plus("inet_pton");
1146
errno = e;
601
1147
goto mandos_end;
602
1148
}
603
1149
if(ret == 0){
604
fprintf(stderr, "Bad address: %s\n", ip);
1150
int e = errno;
1151
fprintf_plus(stderr, "Bad address: %s\n", ip);
1152
errno = e;
605
1153
goto mandos_end;
606
1154
}
607
1155
if(af == AF_INET6){
608
to.in6.sin6_port = htons(port); /* Spurious warnings from
609
-Wconversion and
610
-Wunreachable-code */
611
612
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
613
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
614
-Wunreachable-code*/
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
615
1159
if(if_index == AVAHI_IF_UNSPEC){
616
fprintf(stderr, "An IPv6 link-local address is incomplete"
617
" without a network interface\n");
1160
fprintf_plus(stderr, "An IPv6 link-local address is"
1161
" incomplete without a network interface\n");
1162
errno = EINVAL;
618
1163
goto mandos_end;
619
1164
}
620
1165
/* Set the network interface number as scope */
621
to.in6.sin6_scope_id = (uint32_t)if_index;
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
622
1167
}
623
1168
} else {
624
to.in.sin_port = htons(port); /* Spurious warnings from
625
-Wconversion and
626
-Wunreachable-code */
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
627
1170
}
628
1171
629
1172
if(quit_now){
1173
errno = EINTR;
630
1174
goto mandos_end;
631
1175
}
632
1176
634
1178
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
635
1179
char interface[IF_NAMESIZE];
636
1180
if(if_indextoname((unsigned int)if_index, interface) == NULL){
637
perror("if_indextoname");
1181
perror_plus("if_indextoname");
638
1182
} else {
639
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
640
ip, interface, port);
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
641
1185
}
642
1186
} else {
643
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
644
port);
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
645
1189
}
646
1190
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
647
1191
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
648
const char *pcret;
649
if(af == AF_INET6){
650
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
651
sizeof(addrstr));
652
} else {
653
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
654
sizeof(addrstr));
655
}
656
if(pcret == NULL){
657
perror("inet_ntop");
658
} else {
659
if(strcmp(addrstr, ip) != 0){
660
fprintf(stderr, "Canonical address form: %s\n", addrstr);
661
}
662
}
663
}
664
665
if(quit_now){
666
goto mandos_end;
667
}
668
669
if(af == AF_INET6){
670
ret = connect(tcp_sd, &to.in6, sizeof(to));
671
} else {
672
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
673
}
674
if(ret < 0){
675
perror("connect");
676
goto mandos_end;
677
}
678
679
if(quit_now){
680
goto mandos_end;
1192
if(af == AF_INET6){
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
} else {
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
}
1203
if(ret == EAI_SYSTEM){
1204
perror_plus("getnameinfo");
1205
} else if(ret != 0) {
1206
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1207
} else if(strcmp(addrstr, ip) != 0){
1208
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1209
}
1210
}
1211
1212
if(quit_now){
1213
errno = EINTR;
1214
goto mandos_end;
1215
}
1216
1217
while(true){
1218
if(af == AF_INET6){
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1221
} else {
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1224
}
1225
if(ret < 0){
1226
if(errno == ENETUNREACH
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1232
&to)->sin6_addr)))
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1243
1244
Avahi bug reference:
1245
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1247
*/
1248
if(debug){
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1250
" direct route\n");
1251
}
1252
int e = errno;
1253
route_added = add_local_route(ip, if_index);
1254
if(route_added){
1255
continue;
1256
}
1257
errno = e;
1258
}
1259
if(errno != ECONNREFUSED or debug){
1260
int e = errno;
1261
perror_plus("connect");
1262
errno = e;
1263
}
1264
goto mandos_end;
1265
}
1266
1267
if(quit_now){
1268
errno = EINTR;
1269
goto mandos_end;
1270
}
1271
break;
681
1272
}
682
1273
683
1274
const char *out = mandos_protocol_version;
685
1276
while(true){
686
1277
size_t out_size = strlen(out);
687
1278
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
688
out_size - written));
1279
out_size - written));
689
1280
if(ret == -1){
690
perror("write");
1281
int e = errno;
1282
perror_plus("write");
1283
errno = e;
691
1284
goto mandos_end;
692
1285
}
693
1286
written += (size_t)ret;
703
1296
}
704
1297
705
1298
if(quit_now){
1299
errno = EINTR;
706
1300
goto mandos_end;
707
1301
}
708
1302
}
709
1303
710
1304
if(debug){
711
fprintf(stderr, "Establishing TLS session with %s\n", ip);
1305
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
712
1306
}
713
1307
714
1308
if(quit_now){
1309
errno = EINTR;
715
1310
goto mandos_end;
716
1311
}
717
1312
718
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
1313
/* This casting via intptr_t is to eliminate warning about casting
1314
an int to a pointer type. This is exactly how the GnuTLS Guile
1315
function "set-session-transport-fd!" does it. */
1316
gnutls_transport_set_ptr(session,
1317
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
719
1318
720
1319
if(quit_now){
1320
errno = EINTR;
721
1321
goto mandos_end;
722
1322
}
723
1323
724
1324
do {
725
1325
ret = gnutls_handshake(session);
726
1326
if(quit_now){
1327
errno = EINTR;
727
1328
goto mandos_end;
728
1329
}
729
1330
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
730
1331
731
1332
if(ret != GNUTLS_E_SUCCESS){
732
1333
if(debug){
733
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1334
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
734
1335
gnutls_perror(ret);
735
1336
}
1337
errno = EPROTO;
736
1338
goto mandos_end;
737
1339
}
738
1340
739
1341
/* Read OpenPGP packet that contains the wanted password */
740
1342
741
1343
if(debug){
742
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
743
ip);
1344
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1345
" %s\n", ip);
744
1346
}
745
1347
746
1348
while(true){
747
1349
748
1350
if(quit_now){
1351
errno = EINTR;
749
1352
goto mandos_end;
750
1353
}
751
1354
752
1355
buffer_capacity = incbuffer(&buffer, buffer_length,
753
buffer_capacity);
1356
buffer_capacity);
754
1357
if(buffer_capacity == 0){
755
perror("incbuffer");
1358
int e = errno;
1359
perror_plus("incbuffer");
1360
errno = e;
756
1361
goto mandos_end;
757
1362
}
758
1363
759
1364
if(quit_now){
1365
errno = EINTR;
760
1366
goto mandos_end;
761
1367
}
762
1368
775
1381
ret = gnutls_handshake(session);
776
1382
777
1383
if(quit_now){
1384
errno = EINTR;
778
1385
goto mandos_end;
779
1386
}
780
1387
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
781
1388
if(ret < 0){
782
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1389
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1390
"***\n");
783
1391
gnutls_perror(ret);
1392
errno = EPROTO;
784
1393
goto mandos_end;
785
1394
}
786
1395
break;
787
1396
default:
788
fprintf(stderr, "Unknown error while reading data from"
789
" encrypted session with Mandos server\n");
1397
fprintf_plus(stderr, "Unknown error while reading data from"
1398
" encrypted session with Mandos server\n");
790
1399
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1400
errno = EIO;
791
1401
goto mandos_end;
792
1402
}
793
1403
} else {
796
1406
}
797
1407
798
1408
if(debug){
799
fprintf(stderr, "Closing TLS session\n");
1409
fprintf_plus(stderr, "Closing TLS session\n");
800
1410
}
801
1411
802
1412
if(quit_now){
1413
errno = EINTR;
803
1414
goto mandos_end;
804
1415
}
805
1416
806
1417
do {
807
1418
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
808
1419
if(quit_now){
1420
errno = EINTR;
809
1421
goto mandos_end;
810
1422
}
811
1423
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
812
1424
813
1425
if(buffer_length > 0){
814
1426
ssize_t decrypted_buffer_size;
815
decrypted_buffer_size = pgp_packet_decrypt(buffer,
816
buffer_length,
817
&decrypted_buffer);
1427
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1428
&decrypted_buffer, mc);
818
1429
if(decrypted_buffer_size >= 0){
819
1430
820
1431
written = 0;
821
1432
while(written < (size_t) decrypted_buffer_size){
822
1433
if(quit_now){
1434
errno = EINTR;
823
1435
goto mandos_end;
824
1436
}
825
1437
827
1439
(size_t)decrypted_buffer_size - written,
828
1440
stdout);
829
1441
if(ret == 0 and ferror(stdout)){
1442
int e = errno;
830
1443
if(debug){
831
fprintf(stderr, "Error writing encrypted data: %s\n",
832
strerror(errno));
1444
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1445
strerror(errno));
833
1446
}
1447
errno = e;
834
1448
goto mandos_end;
835
1449
}
836
1450
written += (size_t)ret;
842
1456
/* Shutdown procedure */
843
1457
844
1458
mandos_end:
845
free(decrypted_buffer);
846
free(buffer);
847
if(tcp_sd >= 0){
848
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
849
}
850
if(ret == -1){
851
perror("close");
852
}
853
gnutls_deinit(session);
854
if(quit_now){
855
retval = -1;
1459
{
1460
if(route_added){
1461
if(not delete_local_route(ip, if_index)){
1462
fprintf_plus(stderr, "Failed to delete local route to %s on"
1463
" interface %d", ip, if_index);
1464
}
1465
}
1466
int e = errno;
1467
free(decrypted_buffer);
1468
free(buffer);
1469
if(tcp_sd >= 0){
1470
ret = close(tcp_sd);
1471
}
1472
if(ret == -1){
1473
if(e == 0){
1474
e = errno;
1475
}
1476
perror_plus("close");
1477
}
1478
gnutls_deinit(session);
1479
errno = e;
1480
if(quit_now){
1481
errno = EINTR;
1482
retval = -1;
1483
}
856
1484
}
857
1485
return retval;
858
1486
}
859
1487
1488
__attribute__((nonnull))
860
1489
static void resolve_callback(AvahiSServiceResolver *r,
861
1490
AvahiIfIndex interface,
862
1491
AvahiProtocol proto,
870
1499
AVAHI_GCC_UNUSED AvahiStringList *txt,
871
1500
AVAHI_GCC_UNUSED AvahiLookupResultFlags
872
1501
flags,
873
AVAHI_GCC_UNUSED void* userdata){
874
assert(r);
1502
void *mc){
1503
if(r == NULL){
1504
return;
1505
}
875
1506
876
1507
/* Called whenever a service has been resolved successfully or
877
1508
timed out */
878
1509
879
1510
if(quit_now){
1511
avahi_s_service_resolver_free(r);
880
1512
return;
881
1513
}
882
1514
883
1515
switch(event){
884
1516
default:
885
1517
case AVAHI_RESOLVER_FAILURE:
886
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
887
" of type '%s' in domain '%s': %s\n", name, type, domain,
888
avahi_strerror(avahi_server_errno(mc.server)));
1518
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1519
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1520
domain,
1521
avahi_strerror(avahi_server_errno
1522
(((mandos_context*)mc)->server)));
889
1523
break;
890
1524
891
1525
case AVAHI_RESOLVER_FOUND:
893
1527
char ip[AVAHI_ADDRESS_STR_MAX];
894
1528
avahi_address_snprint(ip, sizeof(ip), address);
895
1529
if(debug){
896
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
897
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
898
ip, (intmax_t)interface, port);
1530
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1531
PRIdMAX ") on port %" PRIu16 "\n", name,
1532
host_name, ip, (intmax_t)interface, port);
899
1533
}
900
int ret = start_mandos_communication(ip, port, interface,
901
avahi_proto_to_af(proto));
1534
int ret = start_mandos_communication(ip, (in_port_t)port,
1535
interface,
1536
avahi_proto_to_af(proto),
1537
mc);
902
1538
if(ret == 0){
903
avahi_simple_poll_quit(mc.simple_poll);
1539
avahi_simple_poll_quit(simple_poll);
1540
} else {
1541
if(not add_server(ip, (in_port_t)port, interface,
1542
avahi_proto_to_af(proto),
1543
&((mandos_context*)mc)->current_server)){
1544
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1545
" list\n", name);
1546
}
904
1547
}
905
1548
}
906
1549
}
916
1559
const char *domain,
917
1560
AVAHI_GCC_UNUSED AvahiLookupResultFlags
918
1561
flags,
919
AVAHI_GCC_UNUSED void* userdata){
920
assert(b);
1562
void *mc){
1563
if(b == NULL){
1564
return;
1565
}
921
1566
922
1567
/* Called whenever a new services becomes available on the LAN or
923
1568
is removed from the LAN */
930
1575
default:
931
1576
case AVAHI_BROWSER_FAILURE:
932
1577
933
fprintf(stderr, "(Avahi browser) %s\n",
934
avahi_strerror(avahi_server_errno(mc.server)));
935
avahi_simple_poll_quit(mc.simple_poll);
1578
fprintf_plus(stderr, "(Avahi browser) %s\n",
1579
avahi_strerror(avahi_server_errno
1580
(((mandos_context*)mc)->server)));
1581
avahi_simple_poll_quit(simple_poll);
936
1582
return;
937
1583
938
1584
case AVAHI_BROWSER_NEW:
941
1587
the callback function is called the Avahi server will free the
942
1588
resolver for us. */
943
1589
944
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
945
name, type, domain, protocol, 0,
946
resolve_callback, NULL) == NULL)
947
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
948
name, avahi_strerror(avahi_server_errno(mc.server)));
1590
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1591
interface, protocol, name, type,
1592
domain, protocol, 0,
1593
resolve_callback, mc) == NULL)
1594
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1595
" %s\n", name,
1596
avahi_strerror(avahi_server_errno
1597
(((mandos_context*)mc)->server)));
949
1598
break;
950
1599
951
1600
case AVAHI_BROWSER_REMOVE:
954
1603
case AVAHI_BROWSER_ALL_FOR_NOW:
955
1604
case AVAHI_BROWSER_CACHE_EXHAUSTED:
956
1605
if(debug){
957
fprintf(stderr, "No Mandos server found, still searching...\n");
1606
fprintf_plus(stderr, "No Mandos server found, still"
1607
" searching...\n");
958
1608
}
959
1609
break;
960
1610
}
961
1611
}
962
1612
963
/* stop main loop after sigterm has been called */
1613
/* Signal handler that stops main loop after SIGTERM */
964
1614
static void handle_sigterm(int sig){
965
1615
if(quit_now){
966
1616
return;
968
1618
quit_now = 1;
969
1619
signal_received = sig;
970
1620
int old_errno = errno;
971
if(mc.simple_poll != NULL){
972
avahi_simple_poll_quit(mc.simple_poll);
973
}
974
errno = old_errno;
1621
/* set main loop to exit */
1622
if(simple_poll != NULL){
1623
avahi_simple_poll_quit(simple_poll);
1624
}
1625
errno = old_errno;
1626
}
1627
1628
__attribute__((nonnull, warn_unused_result))
1629
bool get_flags(const char *ifname, struct ifreq *ifr){
1630
int ret;
1631
error_t ret_errno;
1632
1633
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1634
if(s < 0){
1635
ret_errno = errno;
1636
perror_plus("socket");
1637
errno = ret_errno;
1638
return false;
1639
}
1640
strcpy(ifr->ifr_name, ifname);
1641
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1642
if(ret == -1){
1643
if(debug){
1644
ret_errno = errno;
1645
perror_plus("ioctl SIOCGIFFLAGS");
1646
errno = ret_errno;
1647
}
1648
return false;
1649
}
1650
return true;
1651
}
1652
1653
__attribute__((nonnull, warn_unused_result))
1654
bool good_flags(const char *ifname, const struct ifreq *ifr){
1655
1656
/* Reject the loopback device */
1657
if(ifr->ifr_flags & IFF_LOOPBACK){
1658
if(debug){
1659
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1660
ifname);
1661
}
1662
return false;
1663
}
1664
/* Accept point-to-point devices only if connect_to is specified */
1665
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1666
if(debug){
1667
fprintf_plus(stderr, "Accepting point-to-point interface"
1668
" \"%s\"\n", ifname);
1669
}
1670
return true;
1671
}
1672
/* Otherwise, reject non-broadcast-capable devices */
1673
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1674
if(debug){
1675
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1676
" \"%s\"\n", ifname);
1677
}
1678
return false;
1679
}
1680
/* Reject non-ARP interfaces (including dummy interfaces) */
1681
if(ifr->ifr_flags & IFF_NOARP){
1682
if(debug){
1683
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1684
ifname);
1685
}
1686
return false;
1687
}
1688
1689
/* Accept this device */
1690
if(debug){
1691
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1692
}
1693
return true;
1694
}
1695
1696
/*
1697
* This function determines if a directory entry in /sys/class/net
1698
* corresponds to an acceptable network device.
1699
* (This function is passed to scandir(3) as a filter function.)
1700
*/
1701
__attribute__((nonnull, warn_unused_result))
1702
int good_interface(const struct dirent *if_entry){
1703
if(if_entry->d_name[0] == '.'){
1704
return 0;
1705
}
1706
1707
struct ifreq ifr;
1708
if(not get_flags(if_entry->d_name, &ifr)){
1709
if(debug){
1710
fprintf_plus(stderr, "Failed to get flags for interface "
1711
"\"%s\"\n", if_entry->d_name);
1712
}
1713
return 0;
1714
}
1715
1716
if(not good_flags(if_entry->d_name, &ifr)){
1717
return 0;
1718
}
1719
return 1;
1720
}
1721
1722
/*
1723
* This function determines if a network interface is up.
1724
*/
1725
__attribute__((nonnull, warn_unused_result))
1726
bool interface_is_up(const char *interface){
1727
struct ifreq ifr;
1728
if(not get_flags(interface, &ifr)){
1729
if(debug){
1730
fprintf_plus(stderr, "Failed to get flags for interface "
1731
"\"%s\"\n", interface);
1732
}
1733
return false;
1734
}
1735
1736
return (bool)(ifr.ifr_flags & IFF_UP);
1737
}
1738
1739
/*
1740
* This function determines if a network interface is running
1741
*/
1742
__attribute__((nonnull, warn_unused_result))
1743
bool interface_is_running(const char *interface){
1744
struct ifreq ifr;
1745
if(not get_flags(interface, &ifr)){
1746
if(debug){
1747
fprintf_plus(stderr, "Failed to get flags for interface "
1748
"\"%s\"\n", interface);
1749
}
1750
return false;
1751
}
1752
1753
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1754
}
1755
1756
__attribute__((nonnull, pure, warn_unused_result))
1757
int notdotentries(const struct dirent *direntry){
1758
/* Skip "." and ".." */
1759
if(direntry->d_name[0] == '.'
1760
and (direntry->d_name[1] == '\0'
1761
or (direntry->d_name[1] == '.'
1762
and direntry->d_name[2] == '\0'))){
1763
return 0;
1764
}
1765
return 1;
1766
}
1767
1768
/* Is this directory entry a runnable program? */
1769
__attribute__((nonnull, warn_unused_result))
1770
int runnable_hook(const struct dirent *direntry){
1771
int ret;
1772
size_t sret;
1773
struct stat st;
1774
1775
if((direntry->d_name)[0] == '\0'){
1776
/* Empty name? */
1777
return 0;
1778
}
1779
1780
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1781
"abcdefghijklmnopqrstuvwxyz"
1782
"0123456789"
1783
"_.-");
1784
if((direntry->d_name)[sret] != '\0'){
1785
/* Contains non-allowed characters */
1786
if(debug){
1787
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1788
direntry->d_name);
1789
}
1790
return 0;
1791
}
1792
1793
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1794
if(ret == -1){
1795
if(debug){
1796
perror_plus("Could not stat hook");
1797
}
1798
return 0;
1799
}
1800
if(not (S_ISREG(st.st_mode))){
1801
/* Not a regular file */
1802
if(debug){
1803
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1804
direntry->d_name);
1805
}
1806
return 0;
1807
}
1808
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1809
/* Not executable */
1810
if(debug){
1811
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1812
direntry->d_name);
1813
}
1814
return 0;
1815
}
1816
if(debug){
1817
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1818
direntry->d_name);
1819
}
1820
return 1;
1821
}
1822
1823
__attribute__((nonnull, warn_unused_result))
1824
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1825
mandos_context *mc){
1826
int ret;
1827
struct timespec now;
1828
struct timespec waited_time;
1829
intmax_t block_time;
1830
1831
while(true){
1832
if(mc->current_server == NULL){
1833
if(debug){
1834
fprintf_plus(stderr, "Wait until first server is found."
1835
" No timeout!\n");
1836
}
1837
ret = avahi_simple_poll_iterate(s, -1);
1838
} else {
1839
if(debug){
1840
fprintf_plus(stderr, "Check current_server if we should run"
1841
" it, or wait\n");
1842
}
1843
/* the current time */
1844
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1845
if(ret == -1){
1846
perror_plus("clock_gettime");
1847
return -1;
1848
}
1849
/* Calculating in ms how long time between now and server
1850
who we visted longest time ago. Now - last seen. */
1851
waited_time.tv_sec = (now.tv_sec
1852
- mc->current_server->last_seen.tv_sec);
1853
waited_time.tv_nsec = (now.tv_nsec
1854
- mc->current_server->last_seen.tv_nsec);
1855
/* total time is 10s/10,000ms.
1856
Converting to s from ms by dividing by 1,000,
1857
and ns to ms by dividing by 1,000,000. */
1858
block_time = ((retry_interval
1859
- ((intmax_t)waited_time.tv_sec * 1000))
1860
- ((intmax_t)waited_time.tv_nsec / 1000000));
1861
1862
if(debug){
1863
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1864
block_time);
1865
}
1866
1867
if(block_time <= 0){
1868
ret = start_mandos_communication(mc->current_server->ip,
1869
mc->current_server->port,
1870
mc->current_server->if_index,
1871
mc->current_server->af, mc);
1872
if(ret == 0){
1873
avahi_simple_poll_quit(s);
1874
return 0;
1875
}
1876
ret = clock_gettime(CLOCK_MONOTONIC,
1877
&mc->current_server->last_seen);
1878
if(ret == -1){
1879
perror_plus("clock_gettime");
1880
return -1;
1881
}
1882
mc->current_server = mc->current_server->next;
1883
block_time = 0; /* Call avahi to find new Mandos
1884
servers, but don't block */
1885
}
1886
1887
ret = avahi_simple_poll_iterate(s, (int)block_time);
1888
}
1889
if(ret != 0){
1890
if(ret > 0 or errno != EINTR){
1891
return (ret != 1) ? ret : 0;
1892
}
1893
}
1894
}
1895
}
1896
1897
__attribute__((nonnull))
1898
void run_network_hooks(const char *mode, const char *interface,
1899
const float delay){
1900
struct dirent **direntries = NULL;
1901
if(hookdir_fd == -1){
1902
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1903
| O_CLOEXEC);
1904
if(hookdir_fd == -1){
1905
if(errno == ENOENT){
1906
if(debug){
1907
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1908
" found\n", hookdir);
1909
}
1910
} else {
1911
perror_plus("open");
1912
}
1913
return;
1914
}
1915
}
1916
#ifdef __GLIBC__
1917
#if __GLIBC_PREREQ(2, 15)
1918
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1919
runnable_hook, alphasort);
1920
#else /* not __GLIBC_PREREQ(2, 15) */
1921
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1922
alphasort);
1923
#endif /* not __GLIBC_PREREQ(2, 15) */
1924
#else /* not __GLIBC__ */
1925
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1926
alphasort);
1927
#endif /* not __GLIBC__ */
1928
if(numhooks == -1){
1929
perror_plus("scandir");
1930
return;
1931
}
1932
struct dirent *direntry;
1933
int ret;
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1935
if(devnull == -1){
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
return;
1938
}
1939
for(int i = 0; i < numhooks; i++){
1940
direntry = direntries[i];
1941
if(debug){
1942
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1943
direntry->d_name);
1944
}
1945
pid_t hook_pid = fork();
1946
if(hook_pid == 0){
1947
/* Child */
1948
/* Raise privileges */
1949
errno = raise_privileges_permanently();
1950
if(errno != 0){
1951
perror_plus("Failed to raise privileges");
1952
_exit(EX_NOPERM);
1953
}
1954
/* Set group */
1955
errno = 0;
1956
ret = setgid(0);
1957
if(ret == -1){
1958
perror_plus("setgid");
1959
_exit(EX_NOPERM);
1960
}
1961
/* Reset supplementary groups */
1962
errno = 0;
1963
ret = setgroups(0, NULL);
1964
if(ret == -1){
1965
perror_plus("setgroups");
1966
_exit(EX_NOPERM);
1967
}
1968
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1969
if(ret == -1){
1970
perror_plus("setenv");
1971
_exit(EX_OSERR);
1972
}
1973
ret = setenv("DEVICE", interface, 1);
1974
if(ret == -1){
1975
perror_plus("setenv");
1976
_exit(EX_OSERR);
1977
}
1978
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1979
if(ret == -1){
1980
perror_plus("setenv");
1981
_exit(EX_OSERR);
1982
}
1983
ret = setenv("MODE", mode, 1);
1984
if(ret == -1){
1985
perror_plus("setenv");
1986
_exit(EX_OSERR);
1987
}
1988
char *delaystring;
1989
ret = asprintf(&delaystring, "%f", (double)delay);
1990
if(ret == -1){
1991
perror_plus("asprintf");
1992
_exit(EX_OSERR);
1993
}
1994
ret = setenv("DELAY", delaystring, 1);
1995
if(ret == -1){
1996
free(delaystring);
1997
perror_plus("setenv");
1998
_exit(EX_OSERR);
1999
}
2000
free(delaystring);
2001
if(connect_to != NULL){
2002
ret = setenv("CONNECT", connect_to, 1);
2003
if(ret == -1){
2004
perror_plus("setenv");
2005
_exit(EX_OSERR);
2006
}
2007
}
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2009
direntry->d_name,
2010
O_RDONLY));
2011
if(hook_fd == -1){
2012
perror_plus("openat");
2013
_exit(EXIT_FAILURE);
2014
}
2015
if(close(hookdir_fd) == -1){
2016
perror_plus("close");
2017
_exit(EXIT_FAILURE);
2018
}
2019
ret = dup2(devnull, STDIN_FILENO);
2020
if(ret == -1){
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
_exit(EX_OSERR);
2023
}
2024
ret = close(devnull);
2025
if(ret == -1){
2026
perror_plus("close");
2027
_exit(EX_OSERR);
2028
}
2029
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2030
if(ret == -1){
2031
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2032
_exit(EX_OSERR);
2033
}
2034
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2035
environ) == -1){
2036
perror_plus("fexecve");
2037
_exit(EXIT_FAILURE);
2038
}
2039
} else {
2040
if(hook_pid == -1){
2041
perror_plus("fork");
2042
free(direntry);
2043
continue;
2044
}
2045
int status;
2046
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2047
perror_plus("waitpid");
2048
free(direntry);
2049
continue;
2050
}
2051
if(WIFEXITED(status)){
2052
if(WEXITSTATUS(status) != 0){
2053
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2054
" with status %d\n", direntry->d_name,
2055
WEXITSTATUS(status));
2056
free(direntry);
2057
continue;
2058
}
2059
} else if(WIFSIGNALED(status)){
2060
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2061
" signal %d\n", direntry->d_name,
2062
WTERMSIG(status));
2063
free(direntry);
2064
continue;
2065
} else {
2066
fprintf_plus(stderr, "Warning: network hook \"%s\""
2067
" crashed\n", direntry->d_name);
2068
free(direntry);
2069
continue;
2070
}
2071
}
2072
if(debug){
2073
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2074
direntry->d_name);
2075
}
2076
free(direntry);
2077
}
2078
free(direntries);
2079
if(close(hookdir_fd) == -1){
2080
perror_plus("close");
2081
} else {
2082
hookdir_fd = -1;
2083
}
2084
close(devnull);
2085
}
2086
2087
__attribute__((nonnull, warn_unused_result))
2088
error_t bring_up_interface(const char *const interface,
2089
const float delay){
2090
error_t old_errno = errno;
2091
int ret;
2092
struct ifreq network;
2093
unsigned int if_index = if_nametoindex(interface);
2094
if(if_index == 0){
2095
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2096
errno = old_errno;
2097
return ENXIO;
2098
}
2099
2100
if(quit_now){
2101
errno = old_errno;
2102
return EINTR;
2103
}
2104
2105
if(not interface_is_up(interface)){
2106
error_t ret_errno = 0, 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
error_t take_down_interface(const char *const interface){
2216
error_t 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
error_t ret_errno = 0, ioctl_errno = 0;
2226
if(not get_flags(interface, &network) and debug){
2227
ret_errno = errno;
2228
fprintf_plus(stderr, "Failed to get flags for interface "
2229
"\"%s\"\n", interface);
2230
errno = old_errno;
2231
return ret_errno;
2232
}
2233
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2234
2235
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2236
if(sd == -1){
2237
ret_errno = errno;
2238
perror_plus("socket");
2239
errno = old_errno;
2240
return ret_errno;
2241
}
2242
2243
if(debug){
2244
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2245
interface);
2246
}
2247
2248
/* Raise privileges */
2249
ret_errno = raise_privileges();
2250
if(ret_errno != 0){
2251
errno = ret_errno;
2252
perror_plus("Failed to raise privileges");
2253
}
2254
2255
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2256
ioctl_errno = errno;
2257
2258
/* If raise_privileges() succeeded above */
2259
if(ret_errno == 0){
2260
/* Lower privileges */
2261
ret_errno = lower_privileges();
2262
if(ret_errno != 0){
2263
errno = ret_errno;
2264
perror_plus("Failed to lower privileges");
2265
}
2266
}
2267
2268
/* Close the socket */
2269
int ret = close(sd);
2270
if(ret == -1){
2271
perror_plus("close");
2272
}
2273
2274
if(ret_setflags == -1){
2275
errno = ioctl_errno;
2276
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2277
errno = old_errno;
2278
return ioctl_errno;
2279
}
2280
} else if(debug){
2281
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2282
interface);
2283
}
2284
2285
errno = old_errno;
2286
return 0;
975
2287
}
976
2288
977
2289
int main(int argc, char *argv[]){
2290
mandos_context mc = { .server = NULL, .dh_bits = 0,
2291
.priority = "SECURE256:!CTYPE-X.509"
2292
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2293
.current_server = NULL, .interfaces = NULL,
2294
.interfaces_size = 0 };
978
2295
AvahiSServiceBrowser *sb = NULL;
979
int error;
2296
error_t ret_errno;
980
2297
int ret;
981
2298
intmax_t tmpmax;
982
2299
char *tmp;
983
2300
int exitcode = EXIT_SUCCESS;
984
const char *interface = "eth0";
985
struct ifreq network;
986
int sd = -1;
987
bool take_down_interface = false;
988
uid_t uid;
989
gid_t gid;
990
char *connect_to = NULL;
991
char tempdir[] = "/tmp/mandosXXXXXX";
992
bool tempdir_created = false;
2301
char *interfaces_to_take_down = NULL;
2302
size_t interfaces_to_take_down_size = 0;
2303
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2304
char old_tempdir[] = "/tmp/mandosXXXXXX";
2305
char *tempdir = NULL;
993
2306
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
994
2307
const char *seckey = PATHDIR "/" SECKEY;
995
2308
const char *pubkey = PATHDIR "/" PUBKEY;
2309
const char *dh_params_file = NULL;
2310
char *interfaces_hooks = NULL;
996
2311
997
2312
bool gnutls_initialized = false;
998
2313
bool gpgme_initialized = false;
999
2314
float delay = 2.5f;
2315
double retry_interval = 10; /* 10s between trying a server and
2316
retrying the same server again */
1000
2317
1001
2318
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1002
2319
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1008
2325
errno = 0;
1009
2326
ret = setgid(gid);
1010
2327
if(ret == -1){
1011
perror("setgid");
2328
perror_plus("setgid");
1012
2329
}
1013
2330
1014
2331
/* Lower user privileges (temporarily) */
1015
2332
errno = 0;
1016
2333
ret = seteuid(uid);
1017
2334
if(ret == -1){
1018
perror("seteuid");
2335
perror_plus("seteuid");
1019
2336
}
1020
2337
1021
2338
if(quit_now){
1048
2365
.doc = "Bit length of the prime number used in the"
1049
2366
" Diffie-Hellman key exchange",
1050
2367
.group = 2 },
2368
{ .name = "dh-params", .key = 134,
2369
.arg = "FILE",
2370
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2371
" for the Diffie-Hellman key exchange",
2372
.group = 2 },
1051
2373
{ .name = "priority", .key = 130,
1052
2374
.arg = "STRING",
1053
2375
.doc = "GnuTLS priority string for the TLS handshake",
1056
2378
.arg = "SECONDS",
1057
2379
.doc = "Maximum delay to wait for interface startup",
1058
2380
.group = 2 },
2381
{ .name = "retry", .key = 132,
2382
.arg = "SECONDS",
2383
.doc = "Retry interval used when denied by the Mandos server",
2384
.group = 2 },
2385
{ .name = "network-hook-dir", .key = 133,
2386
.arg = "DIR",
2387
.doc = "Directory where network hooks are located",
2388
.group = 2 },
2389
/*
2390
* These reproduce what we would get without ARGP_NO_HELP
2391
*/
2392
{ .name = "help", .key = '?',
2393
.doc = "Give this help list", .group = -1 },
2394
{ .name = "usage", .key = -3,
2395
.doc = "Give a short usage message", .group = -1 },
2396
{ .name = "version", .key = 'V',
2397
.doc = "Print program version", .group = -1 },
1059
2398
{ .name = NULL }
1060
2399
};
1061
2400
1062
2401
error_t parse_opt(int key, char *arg,
1063
2402
struct argp_state *state){
2403
errno = 0;
1064
2404
switch(key){
1065
2405
case 128: /* --debug */
1066
2406
debug = true;
1069
2409
connect_to = arg;
1070
2410
break;
1071
2411
case 'i': /* --interface */
1072
interface = arg;
2412
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2413
arg, (int)',');
2414
if(ret_errno != 0){
2415
argp_error(state, "%s", strerror(ret_errno));
2416
}
1073
2417
break;
1074
2418
case 's': /* --seckey */
1075
2419
seckey = arg;
1082
2426
tmpmax = strtoimax(arg, &tmp, 10);
1083
2427
if(errno != 0 or tmp == arg or *tmp != '\0'
1084
2428
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1085
fprintf(stderr, "Bad number of DH bits\n");
1086
exit(EXIT_FAILURE);
2429
argp_error(state, "Bad number of DH bits");
1087
2430
}
1088
2431
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1089
2432
break;
2433
case 134: /* --dh-params */
2434
dh_params_file = arg;
2435
break;
1090
2436
case 130: /* --priority */
1091
2437
mc.priority = arg;
1092
2438
break;
1094
2440
errno = 0;
1095
2441
delay = strtof(arg, &tmp);
1096
2442
if(errno != 0 or tmp == arg or *tmp != '\0'){
1097
fprintf(stderr, "Bad delay\n");
1098
exit(EXIT_FAILURE);
1099
}
1100
break;
1101
case ARGP_KEY_ARG:
1102
argp_usage(state);
1103
case ARGP_KEY_END:
2443
argp_error(state, "Bad delay");
2444
}
2445
case 132: /* --retry */
2446
errno = 0;
2447
retry_interval = strtod(arg, &tmp);
2448
if(errno != 0 or tmp == arg or *tmp != '\0'
2449
or (retry_interval * 1000) > INT_MAX
2450
or retry_interval < 0){
2451
argp_error(state, "Bad retry interval");
2452
}
2453
break;
2454
case 133: /* --network-hook-dir */
2455
hookdir = arg;
2456
break;
2457
/*
2458
* These reproduce what we would get without ARGP_NO_HELP
2459
*/
2460
case '?': /* --help */
2461
argp_state_help(state, state->out_stream,
2462
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2463
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2464
case -3: /* --usage */
2465
argp_state_help(state, state->out_stream,
2466
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2467
case 'V': /* --version */
2468
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2469
exit(argp_err_exit_status);
1104
2470
break;
1105
2471
default:
1106
2472
return ARGP_ERR_UNKNOWN;
1107
2473
}
1108
return 0;
2474
return errno;
1109
2475
}
1110
2476
1111
2477
struct argp argp = { .options = options, .parser = parse_opt,
1112
2478
.args_doc = "",
1113
2479
.doc = "Mandos client -- Get and decrypt"
1114
2480
" passwords from a Mandos server" };
1115
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1116
if(ret == ARGP_ERR_UNKNOWN){
1117
fprintf(stderr, "Unknown error while parsing arguments\n");
1118
exitcode = EXIT_FAILURE;
1119
goto end;
1120
}
2481
ret = argp_parse(&argp, argc, argv,
2482
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2483
switch(ret){
2484
case 0:
2485
break;
2486
case ENOMEM:
2487
default:
2488
errno = ret;
2489
perror_plus("argp_parse");
2490
exitcode = EX_OSERR;
2491
goto end;
2492
case EINVAL:
2493
exitcode = EX_USAGE;
2494
goto end;
2495
}
2496
}
2497
2498
{
2499
/* Work around Debian bug #633582:
2500
<http://bugs.debian.org/633582> */
2501
2502
/* Re-raise privileges */
2503
ret_errno = raise_privileges();
2504
if(ret_errno != 0){
2505
errno = ret_errno;
2506
perror_plus("Failed to raise privileges");
2507
} else {
2508
struct stat st;
2509
2510
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2511
int seckey_fd = open(seckey, O_RDONLY);
2512
if(seckey_fd == -1){
2513
perror_plus("open");
2514
} else {
2515
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2516
if(ret == -1){
2517
perror_plus("fstat");
2518
} else {
2519
if(S_ISREG(st.st_mode)
2520
and st.st_uid == 0 and st.st_gid == 0){
2521
ret = fchown(seckey_fd, uid, gid);
2522
if(ret == -1){
2523
perror_plus("fchown");
2524
}
2525
}
2526
}
2527
close(seckey_fd);
2528
}
2529
}
2530
2531
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2532
int pubkey_fd = open(pubkey, O_RDONLY);
2533
if(pubkey_fd == -1){
2534
perror_plus("open");
2535
} else {
2536
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2537
if(ret == -1){
2538
perror_plus("fstat");
2539
} else {
2540
if(S_ISREG(st.st_mode)
2541
and st.st_uid == 0 and st.st_gid == 0){
2542
ret = fchown(pubkey_fd, uid, gid);
2543
if(ret == -1){
2544
perror_plus("fchown");
2545
}
2546
}
2547
}
2548
close(pubkey_fd);
2549
}
2550
}
2551
2552
if(dh_params_file != NULL
2553
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2554
int dhparams_fd = open(dh_params_file, O_RDONLY);
2555
if(dhparams_fd == -1){
2556
perror_plus("open");
2557
} else {
2558
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2559
if(ret == -1){
2560
perror_plus("fstat");
2561
} else {
2562
if(S_ISREG(st.st_mode)
2563
and st.st_uid == 0 and st.st_gid == 0){
2564
ret = fchown(dhparams_fd, uid, gid);
2565
if(ret == -1){
2566
perror_plus("fchown");
2567
}
2568
}
2569
}
2570
close(dhparams_fd);
2571
}
2572
}
2573
2574
/* Lower privileges */
2575
ret_errno = lower_privileges();
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2578
perror_plus("Failed to lower privileges");
2579
}
2580
}
2581
}
2582
2583
/* Remove invalid interface names (except "none") */
2584
{
2585
char *interface = NULL;
2586
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2587
interface))){
2588
if(strcmp(interface, "none") != 0
2589
and if_nametoindex(interface) == 0){
2590
if(interface[0] != '\0'){
2591
fprintf_plus(stderr, "Not using nonexisting interface"
2592
" \"%s\"\n", interface);
2593
}
2594
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2595
interface = NULL;
2596
}
2597
}
2598
}
2599
2600
/* Run network hooks */
2601
{
2602
if(mc.interfaces != NULL){
2603
interfaces_hooks = malloc(mc.interfaces_size);
2604
if(interfaces_hooks == NULL){
2605
perror_plus("malloc");
2606
goto end;
2607
}
2608
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2609
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2610
}
2611
run_network_hooks("start", interfaces_hooks != NULL ?
2612
interfaces_hooks : "", delay);
1121
2613
}
1122
2614
1123
2615
if(not debug){
1128
2620
from the signal handler */
1129
2621
/* Initialize the pseudo-RNG for Avahi */
1130
2622
srand((unsigned int) time(NULL));
1131
mc.simple_poll = avahi_simple_poll_new();
1132
if(mc.simple_poll == NULL){
1133
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1134
exitcode = EXIT_FAILURE;
2623
simple_poll = avahi_simple_poll_new();
2624
if(simple_poll == NULL){
2625
fprintf_plus(stderr,
2626
"Avahi: Failed to create simple poll object.\n");
2627
exitcode = EX_UNAVAILABLE;
1135
2628
goto end;
1136
2629
}
1137
2630
1138
2631
sigemptyset(&sigterm_action.sa_mask);
1139
2632
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1140
2633
if(ret == -1){
1141
perror("sigaddset");
1142
exitcode = EXIT_FAILURE;
2634
perror_plus("sigaddset");
2635
exitcode = EX_OSERR;
1143
2636
goto end;
1144
2637
}
1145
2638
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1146
2639
if(ret == -1){
1147
perror("sigaddset");
1148
exitcode = EXIT_FAILURE;
2640
perror_plus("sigaddset");
2641
exitcode = EX_OSERR;
1149
2642
goto end;
1150
2643
}
1151
2644
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1152
2645
if(ret == -1){
1153
perror("sigaddset");
1154
exitcode = EXIT_FAILURE;
2646
perror_plus("sigaddset");
2647
exitcode = EX_OSERR;
1155
2648
goto end;
1156
2649
}
1157
2650
/* Need to check if the handler is SIG_IGN before handling:
1160
2653
*/
1161
2654
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1162
2655
if(ret == -1){
1163
perror("sigaction");
1164
return EXIT_FAILURE;
2656
perror_plus("sigaction");
2657
return EX_OSERR;
1165
2658
}
1166
2659
if(old_sigterm_action.sa_handler != SIG_IGN){
1167
2660
ret = sigaction(SIGINT, &sigterm_action, NULL);
1168
2661
if(ret == -1){
1169
perror("sigaction");
1170
exitcode = EXIT_FAILURE;
2662
perror_plus("sigaction");
2663
exitcode = EX_OSERR;
1171
2664
goto end;
1172
2665
}
1173
2666
}
1174
2667
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1175
2668
if(ret == -1){
1176
perror("sigaction");
1177
return EXIT_FAILURE;
2669
perror_plus("sigaction");
2670
return EX_OSERR;
1178
2671
}
1179
2672
if(old_sigterm_action.sa_handler != SIG_IGN){
1180
2673
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1181
2674
if(ret == -1){
1182
perror("sigaction");
1183
exitcode = EXIT_FAILURE;
2675
perror_plus("sigaction");
2676
exitcode = EX_OSERR;
1184
2677
goto end;
1185
2678
}
1186
2679
}
1187
2680
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1188
2681
if(ret == -1){
1189
perror("sigaction");
1190
return EXIT_FAILURE;
2682
perror_plus("sigaction");
2683
return EX_OSERR;
1191
2684
}
1192
2685
if(old_sigterm_action.sa_handler != SIG_IGN){
1193
2686
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1194
2687
if(ret == -1){
1195
perror("sigaction");
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
1199
}
1200
1201
/* If the interface is down, bring it up */
1202
if(interface[0] != '\0'){
1203
if_index = (AvahiIfIndex) if_nametoindex(interface);
1204
if(if_index == 0){
1205
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1206
exitcode = EXIT_FAILURE;
1207
goto end;
1208
}
1209
1210
if(quit_now){
1211
goto end;
1212
}
1213
1214
/* Re-raise priviliges */
1215
errno = 0;
1216
ret = seteuid(0);
1217
if(ret == -1){
1218
perror("seteuid");
1219
}
1220
1221
#ifdef __linux__
1222
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1223
messages to mess up the prompt */
1224
ret = klogctl(8, NULL, 5);
1225
bool restore_loglevel = true;
1226
if(ret == -1){
1227
restore_loglevel = false;
1228
perror("klogctl");
1229
}
1230
#endif /* __linux__ */
1231
1232
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1233
if(sd < 0){
1234
perror("socket");
1235
exitcode = EXIT_FAILURE;
1236
#ifdef __linux__
1237
if(restore_loglevel){
1238
ret = klogctl(7, NULL, 0);
1239
if(ret == -1){
1240
perror("klogctl");
1241
}
1242
}
1243
#endif /* __linux__ */
1244
/* Lower privileges */
1245
errno = 0;
1246
ret = seteuid(uid);
1247
if(ret == -1){
1248
perror("seteuid");
1249
}
1250
goto end;
1251
}
1252
strcpy(network.ifr_name, interface);
1253
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1254
if(ret == -1){
1255
perror("ioctl SIOCGIFFLAGS");
1256
#ifdef __linux__
1257
if(restore_loglevel){
1258
ret = klogctl(7, NULL, 0);
1259
if(ret == -1){
1260
perror("klogctl");
1261
}
1262
}
1263
#endif /* __linux__ */
1264
exitcode = EXIT_FAILURE;
1265
/* Lower privileges */
1266
errno = 0;
1267
ret = seteuid(uid);
1268
if(ret == -1){
1269
perror("seteuid");
1270
}
1271
goto end;
1272
}
1273
if((network.ifr_flags & IFF_UP) == 0){
1274
network.ifr_flags |= IFF_UP;
1275
take_down_interface = true;
1276
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1277
if(ret == -1){
1278
take_down_interface = false;
1279
perror("ioctl SIOCSIFFLAGS");
1280
exitcode = EXIT_FAILURE;
1281
#ifdef __linux__
1282
if(restore_loglevel){
1283
ret = klogctl(7, NULL, 0);
1284
if(ret == -1){
1285
perror("klogctl");
2688
perror_plus("sigaction");
2689
exitcode = EX_OSERR;
2690
goto end;
2691
}
2692
}
2693
2694
/* If no interfaces were specified, make a list */
2695
if(mc.interfaces == NULL){
2696
struct dirent **direntries = NULL;
2697
/* Look for any good interfaces */
2698
ret = scandir(sys_class_net, &direntries, good_interface,
2699
alphasort);
2700
if(ret >= 1){
2701
/* Add all found interfaces to interfaces list */
2702
for(int i = 0; i < ret; ++i){
2703
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2704
direntries[i]->d_name);
2705
if(ret_errno != 0){
2706
errno = ret_errno;
2707
perror_plus("argz_add");
2708
free(direntries[i]);
2709
continue;
2710
}
2711
if(debug){
2712
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2713
direntries[i]->d_name);
2714
}
2715
free(direntries[i]);
2716
}
2717
free(direntries);
2718
} else {
2719
if(ret == 0){
2720
free(direntries);
2721
}
2722
fprintf_plus(stderr, "Could not find a network interface\n");
2723
exitcode = EXIT_FAILURE;
2724
goto end;
2725
}
2726
}
2727
2728
/* Bring up interfaces which are down, and remove any "none"s */
2729
{
2730
char *interface = NULL;
2731
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2732
interface))){
2733
/* If interface name is "none", stop bringing up interfaces.
2734
Also remove all instances of "none" from the list */
2735
if(strcmp(interface, "none") == 0){
2736
argz_delete(&mc.interfaces, &mc.interfaces_size,
2737
interface);
2738
interface = NULL;
2739
while((interface = argz_next(mc.interfaces,
2740
mc.interfaces_size, interface))){
2741
if(strcmp(interface, "none") == 0){
2742
argz_delete(&mc.interfaces, &mc.interfaces_size,
2743
interface);
2744
interface = NULL;
1286
2745
}
1287
2746
}
1288
#endif /* __linux__ */
1289
/* Lower privileges */
1290
errno = 0;
1291
ret = seteuid(uid);
1292
if(ret == -1){
1293
perror("seteuid");
1294
}
1295
goto end;
1296
}
1297
}
1298
/* sleep checking until interface is running */
1299
for(int i=0; i < delay * 4; i++){
1300
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1301
if(ret == -1){
1302
perror("ioctl SIOCGIFFLAGS");
1303
} else if(network.ifr_flags & IFF_RUNNING){
1304
2747
break;
1305
2748
}
1306
struct timespec sleeptime = { .tv_nsec = 250000000 };
1307
ret = nanosleep(&sleeptime, NULL);
1308
if(ret == -1 and errno != EINTR){
1309
perror("nanosleep");
1310
}
1311
}
1312
if(not take_down_interface){
1313
/* We won't need the socket anymore */
1314
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1315
if(ret == -1){
1316
perror("close");
1317
}
1318
}
1319
#ifdef __linux__
1320
if(restore_loglevel){
1321
/* Restores kernel loglevel to default */
1322
ret = klogctl(7, NULL, 0);
1323
if(ret == -1){
1324
perror("klogctl");
1325
}
1326
}
1327
#endif /* __linux__ */
1328
/* Lower privileges */
1329
errno = 0;
1330
if(take_down_interface){
1331
/* Lower privileges */
1332
ret = seteuid(uid);
1333
if(ret == -1){
1334
perror("seteuid");
1335
}
1336
} else {
1337
/* Lower privileges permanently */
1338
ret = setuid(uid);
1339
if(ret == -1){
1340
perror("setuid");
1341
}
1342
}
2749
bool interface_was_up = interface_is_up(interface);
2750
errno = bring_up_interface(interface, delay);
2751
if(not interface_was_up){
2752
if(errno != 0){
2753
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2754
" %s\n", interface, strerror(errno));
2755
} else {
2756
errno = argz_add(&interfaces_to_take_down,
2757
&interfaces_to_take_down_size,
2758
interface);
2759
if(errno != 0){
2760
perror_plus("argz_add");
2761
}
2762
}
2763
}
2764
}
2765
if(debug and (interfaces_to_take_down == NULL)){
2766
fprintf_plus(stderr, "No interfaces were brought up\n");
2767
}
2768
}
2769
2770
/* If we only got one interface, explicitly use only that one */
2771
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2772
if(debug){
2773
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2774
mc.interfaces);
2775
}
2776
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1343
2777
}
1344
2778
1345
2779
if(quit_now){
1346
2780
goto end;
1347
2781
}
1348
2782
1349
ret = init_gnutls_global(pubkey, seckey);
2783
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1350
2784
if(ret == -1){
1351
fprintf(stderr, "init_gnutls_global failed\n");
1352
exitcode = EXIT_FAILURE;
2785
fprintf_plus(stderr, "init_gnutls_global failed\n");
2786
exitcode = EX_UNAVAILABLE;
1353
2787
goto end;
1354
2788
} else {
1355
2789
gnutls_initialized = true;
1359
2793
goto end;
1360
2794
}
1361
2795
1362
tempdir_created = true;
1363
if(mkdtemp(tempdir) == NULL){
1364
tempdir_created = false;
1365
perror("mkdtemp");
2796
/* Try /run/tmp before /tmp */
2797
tempdir = mkdtemp(run_tempdir);
2798
if(tempdir == NULL and errno == ENOENT){
2799
if(debug){
2800
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2801
run_tempdir, old_tempdir);
2802
}
2803
tempdir = mkdtemp(old_tempdir);
2804
}
2805
if(tempdir == NULL){
2806
perror_plus("mkdtemp");
1366
2807
goto end;
1367
2808
}
1368
2809
1370
2811
goto end;
1371
2812
}
1372
2813
1373
if(not init_gpgme(pubkey, seckey, tempdir)){
1374
fprintf(stderr, "init_gpgme failed\n");
1375
exitcode = EXIT_FAILURE;
2814
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2815
fprintf_plus(stderr, "init_gpgme failed\n");
2816
exitcode = EX_UNAVAILABLE;
1376
2817
goto end;
1377
2818
} else {
1378
2819
gpgme_initialized = true;
1386
2827
/* Connect directly, do not use Zeroconf */
1387
2828
/* (Mainly meant for debugging) */
1388
2829
char *address = strrchr(connect_to, ':');
2830
1389
2831
if(address == NULL){
1390
fprintf(stderr, "No colon in address\n");
1391
exitcode = EXIT_FAILURE;
2832
fprintf_plus(stderr, "No colon in address\n");
2833
exitcode = EX_USAGE;
1392
2834
goto end;
1393
2835
}
1394
2836
1396
2838
goto end;
1397
2839
}
1398
2840
1399
uint16_t port;
2841
in_port_t port;
1400
2842
errno = 0;
1401
2843
tmpmax = strtoimax(address+1, &tmp, 10);
1402
2844
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1403
or tmpmax != (uint16_t)tmpmax){
1404
fprintf(stderr, "Bad port number\n");
1405
exitcode = EXIT_FAILURE;
2845
or tmpmax != (in_port_t)tmpmax){
2846
fprintf_plus(stderr, "Bad port number\n");
2847
exitcode = EX_USAGE;
1406
2848
goto end;
1407
2849
}
1408
2850
1409
2851
if(quit_now){
1410
2852
goto end;
1411
2853
}
1412
2854
1413
port = (uint16_t)tmpmax;
2855
port = (in_port_t)tmpmax;
1414
2856
*address = '\0';
1415
address = connect_to;
1416
2857
/* Colon in address indicates IPv6 */
1417
2858
int af;
1418
if(strchr(address, ':') != NULL){
2859
if(strchr(connect_to, ':') != NULL){
1419
2860
af = AF_INET6;
2861
/* Accept [] around IPv6 address - see RFC 5952 */
2862
if(connect_to[0] == '[' and address[-1] == ']')
2863
{
2864
connect_to++;
2865
address[-1] = '\0';
2866
}
1420
2867
} else {
1421
2868
af = AF_INET;
1422
2869
}
2870
address = connect_to;
1423
2871
1424
2872
if(quit_now){
1425
2873
goto end;
1426
2874
}
1427
2875
1428
ret = start_mandos_communication(address, port, if_index, af);
1429
if(ret < 0){
1430
exitcode = EXIT_FAILURE;
1431
} else {
2876
while(not quit_now){
2877
ret = start_mandos_communication(address, port, if_index, af,
2878
&mc);
2879
if(quit_now or ret == 0){
2880
break;
2881
}
2882
if(debug){
2883
fprintf_plus(stderr, "Retrying in %d seconds\n",
2884
(int)retry_interval);
2885
}
2886
sleep((unsigned int)retry_interval);
2887
}
2888
2889
if(not quit_now){
1432
2890
exitcode = EXIT_SUCCESS;
1433
2891
}
2892
1434
2893
goto end;
1435
2894
}
1436
2895
1448
2907
config.publish_domain = 0;
1449
2908
1450
2909
/* Allocate a new server */
1451
mc.server = avahi_server_new(avahi_simple_poll_get
1452
(mc.simple_poll), &config, NULL,
1453
NULL, &error);
2910
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2911
&config, NULL, NULL, &ret_errno);
1454
2912
1455
2913
/* Free the Avahi configuration data */
1456
2914
avahi_server_config_free(&config);
1458
2916
1459
2917
/* Check if creating the Avahi server object succeeded */
1460
2918
if(mc.server == NULL){
1461
fprintf(stderr, "Failed to create Avahi server: %s\n",
1462
avahi_strerror(error));
1463
exitcode = EXIT_FAILURE;
2919
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2920
avahi_strerror(ret_errno));
2921
exitcode = EX_UNAVAILABLE;
1464
2922
goto end;
1465
2923
}
1466
2924
1471
2929
/* Create the Avahi service browser */
1472
2930
sb = avahi_s_service_browser_new(mc.server, if_index,
1473
2931
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1474
NULL, 0, browse_callback, NULL);
2932
NULL, 0, browse_callback,
2933
(void *)&mc);
1475
2934
if(sb == NULL){
1476
fprintf(stderr, "Failed to create service browser: %s\n",
1477
avahi_strerror(avahi_server_errno(mc.server)));
1478
exitcode = EXIT_FAILURE;
2935
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2936
avahi_strerror(avahi_server_errno(mc.server)));
2937
exitcode = EX_UNAVAILABLE;
1479
2938
goto end;
1480
2939
}
1481
2940
1486
2945
/* Run the main loop */
1487
2946
1488
2947
if(debug){
1489
fprintf(stderr, "Starting Avahi loop search\n");
2948
fprintf_plus(stderr, "Starting Avahi loop search\n");
1490
2949
}
1491
2950
1492
avahi_simple_poll_loop(mc.simple_poll);
2951
ret = avahi_loop_with_timeout(simple_poll,
2952
(int)(retry_interval * 1000), &mc);
2953
if(debug){
2954
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2955
(ret == 0) ? "successfully" : "with error");
2956
}
1493
2957
1494
2958
end:
1495
2959
1496
2960
if(debug){
1497
fprintf(stderr, "%s exiting\n", argv[0]);
2961
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1498
2962
}
1499
2963
1500
2964
/* Cleanup things */
2965
free(mc.interfaces);
2966
1501
2967
if(sb != NULL)
1502
2968
avahi_s_service_browser_free(sb);
1503
2969
1504
2970
if(mc.server != NULL)
1505
2971
avahi_server_free(mc.server);
1506
2972
1507
if(mc.simple_poll != NULL)
1508
avahi_simple_poll_free(mc.simple_poll);
2973
if(simple_poll != NULL)
2974
avahi_simple_poll_free(simple_poll);
1509
2975
1510
2976
if(gnutls_initialized){
1511
2977
gnutls_certificate_free_credentials(mc.cred);
1517
2983
gpgme_release(mc.ctx);
1518
2984
}
1519
2985
1520
/* Take down the network interface */
1521
if(take_down_interface){
1522
/* Re-raise priviliges */
1523
errno = 0;
1524
ret = seteuid(0);
1525
if(ret == -1){
1526
perror("seteuid");
1527
}
1528
if(geteuid() == 0){
1529
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1530
if(ret == -1){
1531
perror("ioctl SIOCGIFFLAGS");
1532
} else if(network.ifr_flags & IFF_UP) {
1533
network.ifr_flags &= ~IFF_UP; /* clear flag */
1534
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1535
if(ret == -1){
1536
perror("ioctl SIOCSIFFLAGS");
1537
}
1538
}
1539
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1540
if(ret == -1){
1541
perror("close");
1542
}
1543
/* Lower privileges permanently */
1544
errno = 0;
1545
ret = setuid(uid);
1546
if(ret == -1){
1547
perror("setuid");
1548
}
1549
}
1550
}
1551
1552
/* Removes the temp directory used by GPGME */
1553
if(tempdir_created){
1554
DIR *d;
1555
struct dirent *direntry;
1556
d = opendir(tempdir);
1557
if(d == NULL){
1558
if(errno != ENOENT){
1559
perror("opendir");
1560
}
1561
} else {
1562
while(true){
1563
direntry = readdir(d);
1564
if(direntry == NULL){
1565
break;
1566
}
1567
/* Skip "." and ".." */
1568
if(direntry->d_name[0] == '.'
1569
and (direntry->d_name[1] == '\0'
1570
or (direntry->d_name[1] == '.'
1571
and direntry->d_name[2] == '\0'))){
1572
continue;
1573
}
1574
char *fullname = NULL;
1575
ret = asprintf(&fullname, "%s/%s", tempdir,
1576
direntry->d_name);
1577
if(ret < 0){
1578
perror("asprintf");
1579
continue;
1580
}
1581
ret = remove(fullname);
1582
if(ret == -1){
1583
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1584
strerror(errno));
1585
}
1586
free(fullname);
1587
}
1588
closedir(d);
1589
}
1590
ret = rmdir(tempdir);
1591
if(ret == -1 and errno != ENOENT){
1592
perror("rmdir");
2986
/* Cleans up the circular linked list of Mandos servers the client
2987
has seen */
2988
if(mc.current_server != NULL){
2989
mc.current_server->prev->next = NULL;
2990
while(mc.current_server != NULL){
2991
server *next = mc.current_server->next;
2992
#ifdef __GNUC__
2993
#pragma GCC diagnostic push
2994
#pragma GCC diagnostic ignored "-Wcast-qual"
2995
#endif
2996
free((char *)(mc.current_server->ip));
2997
#ifdef __GNUC__
2998
#pragma GCC diagnostic pop
2999
#endif
3000
free(mc.current_server);
3001
mc.current_server = next;
3002
}
3003
}
3004
3005
/* Re-raise privileges */
3006
{
3007
ret_errno = raise_privileges();
3008
if(ret_errno != 0){
3009
errno = ret_errno;
3010
perror_plus("Failed to raise privileges");
3011
} else {
3012
3013
/* Run network hooks */
3014
run_network_hooks("stop", interfaces_hooks != NULL ?
3015
interfaces_hooks : "", delay);
3016
3017
/* Take down the network interfaces which were brought up */
3018
{
3019
char *interface = NULL;
3020
while((interface=argz_next(interfaces_to_take_down,
3021
interfaces_to_take_down_size,
3022
interface))){
3023
ret_errno = take_down_interface(interface);
3024
if(ret_errno != 0){
3025
errno = ret_errno;
3026
perror_plus("Failed to take down interface");
3027
}
3028
}
3029
if(debug and (interfaces_to_take_down == NULL)){
3030
fprintf_plus(stderr, "No interfaces needed to be taken"
3031
" down\n");
3032
}
3033
}
3034
}
3035
3036
ret_errno = lower_privileges_permanently();
3037
if(ret_errno != 0){
3038
errno = ret_errno;
3039
perror_plus("Failed to lower privileges permanently");
3040
}
3041
}
3042
3043
free(interfaces_to_take_down);
3044
free(interfaces_hooks);
3045
3046
/* Removes the GPGME temp directory and all files inside */
3047
if(tempdir != NULL){
3048
struct dirent **direntries = NULL;
3049
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3050
| O_NOFOLLOW
3051
| O_DIRECTORY
3052
| O_PATH));
3053
if(tempdir_fd == -1){
3054
perror_plus("open");
3055
} else {
3056
#ifdef __GLIBC__
3057
#if __GLIBC_PREREQ(2, 15)
3058
int numentries = scandirat(tempdir_fd, ".", &direntries,
3059
notdotentries, alphasort);
3060
#else /* not __GLIBC_PREREQ(2, 15) */
3061
int numentries = scandir(tempdir, &direntries, notdotentries,
3062
alphasort);
3063
#endif /* not __GLIBC_PREREQ(2, 15) */
3064
#else /* not __GLIBC__ */
3065
int numentries = scandir(tempdir, &direntries, notdotentries,
3066
alphasort);
3067
#endif /* not __GLIBC__ */
3068
if(numentries >= 0){
3069
for(int i = 0; i < numentries; i++){
3070
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3071
if(ret == -1){
3072
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3073
" \"%s\", 0): %s\n", tempdir,
3074
direntries[i]->d_name, strerror(errno));
3075
}
3076
free(direntries[i]);
3077
}
3078
3079
/* need to clean even if 0 because man page doesn't specify */
3080
free(direntries);
3081
if(numentries == -1){
3082
perror_plus("scandir");
3083
}
3084
ret = rmdir(tempdir);
3085
if(ret == -1 and errno != ENOENT){
3086
perror_plus("rmdir");
3087
}
3088
}
3089
close(tempdir_fd);
1593
3090
}
1594
3091
}
1595
3092
1600
3097
&old_sigterm_action,
1601
3098
NULL));
1602
3099
if(ret == -1){
1603
perror("sigaction");
3100
perror_plus("sigaction");
1604
3101
}
1605
3102
do {
1606
3103
ret = raise(signal_received);
1607
3104
} while(ret != 0 and errno == EINTR);
1608
3105
if(ret != 0){
1609
perror("raise");
3106
perror_plus("raise");
1610
3107
abort();
1611
3108
}
1612
3109
TEMP_FAILURE_RETRY(pause());
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0