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- Committer: Teddy Hogeborn
- Date: 2011-09-18 15:59:05 UTC
- mfrom: (24.1.179 mandos)
- Revision ID: teddy@fukt.bsnet.se-20110918155905-ngj2ig0yheralj1s
* DBUS-API: Document new "Expires" and "ExtendedTimeout" properties.
* README: Refer to the installed manual page more simply.
* mandos (Client.extended_timeout, Client.expires): New attributes.
(Client.extended_timeout_milliseconds): New.
(Client.__init__, Client.enable, Client.disable): Set new attributes.
(Client.checked_ok): Take new "timeout" argument.
(ClientDBus.expires): Transform into a property which sends a D-Bus
signal when changed.
(ClientDBus._datetime_to_dbus): Return empty D-Bus string on None.
All callers changed to use this.
(ClientDBus.ApprovedByDefault_dbus_property,
ClientDBus.ApprovalDelay_dbus_property,
ClientDBus.ApprovalDuration_dbus_property,
ClientDBus.Host_dbus_property, ClientDBus.Timeout_dbus_property,
ClientDBus.Interval_dbus_property,
ClientDBus.Checker_dbus_property): Bug fix: Only send D-Bus signal
if new value is different.
(ClientDBus.Timeout_dbus_property): Use new "expires" attribute.
(ClientDBus.Expires_dbus_property,
ClientDBus.ExtendedTimeout_dbus_property): New D-Bus properties.
(ClientHandler.handle): Bump time using extended_timeout value.
(main.client_defaults): Change default values of "timeout" and
"interval", added new default value for
"extended_timeout".
* mandos-clients.conf.xml (OPTIONS): Changed default values of
"interval" and "timeout". Add
new "extended_timeout" option.
(EXAMPLE): Updated default values.
* mandos-ctl: Show new "ExtendedTimeout" D-Bus property and change it
using new "--extended-timeout" option.
* mandos-ctl.xml (SYNOPSIS, OPTIONS): Document new
"--extended-timeout" option.
* mandos-monitor (MandosClientWidget.update): Use new "Expires" D-Bus
property.
* mandos.xml (DESCRIPTION): Add reference to intro(8mandos) manual
page.
(CHECKING): Refer to the new "extended_timeout" option in
clients.conf.
* README: Refer to the installed manual page more simply.
* mandos (Client.extended_timeout, Client.expires): New attributes.
(Client.extended_timeout_milliseconds): New.
(Client.__init__, Client.enable, Client.disable): Set new attributes.
(Client.checked_ok): Take new "timeout" argument.
(ClientDBus.expires): Transform into a property which sends a D-Bus
signal when changed.
(ClientDBus._datetime_to_dbus): Return empty D-Bus string on None.
All callers changed to use this.
(ClientDBus.ApprovedByDefault_dbus_property,
ClientDBus.ApprovalDelay_dbus_property,
ClientDBus.ApprovalDuration_dbus_property,
ClientDBus.Host_dbus_property, ClientDBus.Timeout_dbus_property,
ClientDBus.Interval_dbus_property,
ClientDBus.Checker_dbus_property): Bug fix: Only send D-Bus signal
if new value is different.
(ClientDBus.Timeout_dbus_property): Use new "expires" attribute.
(ClientDBus.Expires_dbus_property,
ClientDBus.ExtendedTimeout_dbus_property): New D-Bus properties.
(ClientHandler.handle): Bump time using extended_timeout value.
(main.client_defaults): Change default values of "timeout" and
"interval", added new default value for
"extended_timeout".
* mandos-clients.conf.xml (OPTIONS): Changed default values of
"interval" and "timeout". Add
new "extended_timeout" option.
(EXAMPLE): Updated default values.
* mandos-ctl: Show new "ExtendedTimeout" D-Bus property and change it
using new "--extended-timeout" option.
* mandos-ctl.xml (SYNOPSIS, OPTIONS): Document new
"--extended-timeout" option.
* mandos-monitor (MandosClientWidget.update): Use new "Expires" D-Bus
property.
* mandos.xml (DESCRIPTION): Add reference to intro(8mandos) manual
page.
(CHECKING): Refer to the new "extended_timeout" option in
clients.conf.
- files removed:
- debian/mandos-client.examples
- debian/upstream
- network-hooks.d
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
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#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
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#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
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strtof(), abort() */
53
53
sockaddr_in6, PF_INET6,
54
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SOCK_STREAM, uid_t, gid_t, open(),
55
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opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
78
#include <iso646.h> /* not, or, and */
80
79
#include <argp.h> /* struct argp_option, error_t, struct
81
80
argp_state, struct argp,
86
85
raise() */
87
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
87
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() */
98
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99
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#ifdef __linux__
100
90
#include <sys/klog.h> /* klogctl() */
118
108
init_gnutls_session(),
119
109
GNUTLS_* */
120
110
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
111
/* gnutls_certificate_set_openpgp_key_file(),
112
GNUTLS_OPENPGP_FMT_BASE64 */
123
113
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/* GPGME */
125
115
#include <gpgme.h> /* All GPGME types, constants and
133
123
#define PATHDIR "/conf/conf.d/mandos"
134
124
#define SECKEY "seckey.txt"
135
125
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
126
138
127
bool debug = false;
139
128
static const char mandos_protocol_version[] = "1";
140
129
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
142
131
static const char sys_class_net[] = "/sys/class/net";
143
132
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
133
149
134
/* Doubly linked list that need to be circularly linked when used */
150
135
typedef struct server{
151
136
const char *ip;
152
in_port_t port;
137
uint16_t port;
153
138
AvahiIfIndex if_index;
154
139
int af;
155
140
struct timespec last_seen;
159
144
160
145
/* Used for passing in values through the Avahi callback functions */
161
146
typedef struct {
147
AvahiSimplePoll *simple_poll;
162
148
AvahiServer *server;
163
149
gnutls_certificate_credentials_t cred;
164
150
unsigned int dh_bits;
166
152
const char *priority;
167
153
gpgme_ctx_t ctx;
168
154
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
155
} mandos_context;
172
156
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
175
162
176
163
sig_atomic_t quit_now = 0;
177
164
int signal_received = 0;
178
165
179
166
/* Function to use when printing errors */
180
167
void perror_plus(const char *print_text){
181
int e = errno;
182
168
fprintf(stderr, "Mandos plugin %s: ",
183
169
program_invocation_short_name);
184
errno = e;
185
170
perror(print_text);
186
171
}
187
172
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
198
173
/*
199
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
175
* bytes. "buffer_capacity" is how much is currently allocated,
201
176
* "buffer_length" is how much is already used.
202
177
*/
203
__attribute__((nonnull, warn_unused_result))
204
178
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
179
size_t buffer_capacity){
206
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
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;
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
if(buffer == NULL){
213
183
return 0;
214
184
}
215
*buffer = new_buf;
216
185
buffer_capacity += BUFFER_SIZE;
217
186
}
218
187
return buffer_capacity;
219
188
}
220
189
221
190
/* 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){
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
225
194
int ret;
226
195
server *new_server = malloc(sizeof(server));
227
196
if(new_server == NULL){
228
197
perror_plus("malloc");
229
return false;
198
return -1;
230
199
}
231
200
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
201
.port = port,
202
.if_index = if_index,
203
.af = af };
235
204
if(new_server->ip == NULL){
236
205
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
free(new_server->ip);
244
free(new_server);
245
return false;
206
return -1;
246
207
}
247
208
/* Special case of first server */
248
if(*current_server == NULL){
209
if (mc.current_server == NULL){
249
210
new_server->next = new_server;
250
211
new_server->prev = new_server;
251
*current_server = new_server;
212
mc.current_server = new_server;
213
/* Place the new server last in the list */
252
214
} else {
253
/* Place the new server last in the list */
254
new_server->next = *current_server;
255
new_server->prev = (*current_server)->prev;
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
256
217
new_server->prev->next = new_server;
257
(*current_server)->prev = new_server;
258
}
259
return true;
218
mc.current_server->prev = new_server;
219
}
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
if(ret == -1){
222
perror_plus("clock_gettime");
223
return -1;
224
}
225
return 0;
260
226
}
261
227
262
228
/*
263
229
* Initialize GPGME.
264
230
*/
265
__attribute__((nonnull, warn_unused_result))
266
static bool init_gpgme(const char * const seckey,
267
const char * const pubkey,
268
const char * const tempdir,
269
mandos_context *mc){
231
static bool init_gpgme(const char *seckey,
232
const char *pubkey, const char *tempdir){
270
233
gpgme_error_t rc;
271
234
gpgme_engine_info_t engine_info;
272
235
236
273
237
/*
274
238
* Helper function to insert pub and seckey to the engine keyring.
275
239
*/
276
bool import_key(const char * const filename){
240
bool import_key(const char *filename){
277
241
int ret;
278
242
int fd;
279
243
gpgme_data_t pgp_data;
286
250
287
251
rc = gpgme_data_new_from_fd(&pgp_data, fd);
288
252
if(rc != GPG_ERR_NO_ERROR){
289
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
254
gpgme_strsource(rc), gpgme_strerror(rc));
291
255
return false;
292
256
}
293
257
294
rc = gpgme_op_import(mc->ctx, pgp_data);
258
rc = gpgme_op_import(mc.ctx, pgp_data);
295
259
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
298
262
return false;
299
263
}
300
264
307
271
}
308
272
309
273
if(debug){
310
fprintf_plus(stderr, "Initializing GPGME\n");
274
fprintf(stderr, "Initializing GPGME\n");
311
275
}
312
276
313
277
/* Init GPGME */
314
278
gpgme_check_version(NULL);
315
279
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
316
280
if(rc != GPG_ERR_NO_ERROR){
317
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
318
gpgme_strsource(rc), gpgme_strerror(rc));
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
282
gpgme_strsource(rc), gpgme_strerror(rc));
319
283
return false;
320
284
}
321
285
322
286
/* Set GPGME home directory for the OpenPGP engine only */
323
287
rc = gpgme_get_engine_info(&engine_info);
324
288
if(rc != GPG_ERR_NO_ERROR){
325
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
326
gpgme_strsource(rc), gpgme_strerror(rc));
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
290
gpgme_strsource(rc), gpgme_strerror(rc));
327
291
return false;
328
292
}
329
293
while(engine_info != NULL){
335
299
engine_info = engine_info->next;
336
300
}
337
301
if(engine_info == NULL){
338
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
339
tempdir);
302
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
340
303
return false;
341
304
}
342
305
343
306
/* Create new GPGME "context" */
344
rc = gpgme_new(&(mc->ctx));
307
rc = gpgme_new(&(mc.ctx));
345
308
if(rc != GPG_ERR_NO_ERROR){
346
fprintf_plus(stderr, "Mandos plugin mandos-client: "
347
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
348
gpgme_strerror(rc));
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
349
311
return false;
350
312
}
351
313
360
322
* Decrypt OpenPGP data.
361
323
* Returns -1 on error
362
324
*/
363
__attribute__((nonnull, warn_unused_result))
364
325
static ssize_t pgp_packet_decrypt(const char *cryptotext,
365
326
size_t crypto_size,
366
char **plaintext,
367
mandos_context *mc){
327
char **plaintext){
368
328
gpgme_data_t dh_crypto, dh_plain;
369
329
gpgme_error_t rc;
370
330
ssize_t ret;
372
332
ssize_t plaintext_length = 0;
373
333
374
334
if(debug){
375
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
376
336
}
377
337
378
338
/* Create new GPGME data buffer from memory cryptotext */
379
339
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
380
340
0);
381
341
if(rc != GPG_ERR_NO_ERROR){
382
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
383
gpgme_strsource(rc), gpgme_strerror(rc));
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
343
gpgme_strsource(rc), gpgme_strerror(rc));
384
344
return -1;
385
345
}
386
346
387
347
/* Create new empty GPGME data buffer for the plaintext */
388
348
rc = gpgme_data_new(&dh_plain);
389
349
if(rc != GPG_ERR_NO_ERROR){
390
fprintf_plus(stderr, "Mandos plugin mandos-client: "
391
"bad gpgme_data_new: %s: %s\n",
392
gpgme_strsource(rc), gpgme_strerror(rc));
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
351
gpgme_strsource(rc), gpgme_strerror(rc));
393
352
gpgme_data_release(dh_crypto);
394
353
return -1;
395
354
}
396
355
397
356
/* Decrypt data from the cryptotext data buffer to the plaintext
398
357
data buffer */
399
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
400
359
if(rc != GPG_ERR_NO_ERROR){
401
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
402
gpgme_strsource(rc), gpgme_strerror(rc));
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
403
362
plaintext_length = -1;
404
363
if(debug){
405
364
gpgme_decrypt_result_t result;
406
result = gpgme_op_decrypt_result(mc->ctx);
365
result = gpgme_op_decrypt_result(mc.ctx);
407
366
if(result == NULL){
408
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
409
368
} else {
410
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
411
result->unsupported_algorithm);
412
fprintf_plus(stderr, "Wrong key usage: %u\n",
413
result->wrong_key_usage);
369
fprintf(stderr, "Unsupported algorithm: %s\n",
370
result->unsupported_algorithm);
371
fprintf(stderr, "Wrong key usage: %u\n",
372
result->wrong_key_usage);
414
373
if(result->file_name != NULL){
415
fprintf_plus(stderr, "File name: %s\n", result->file_name);
374
fprintf(stderr, "File name: %s\n", result->file_name);
416
375
}
417
376
gpgme_recipient_t recipient;
418
377
recipient = result->recipients;
419
378
while(recipient != NULL){
420
fprintf_plus(stderr, "Public key algorithm: %s\n",
421
gpgme_pubkey_algo_name
422
(recipient->pubkey_algo));
423
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
424
fprintf_plus(stderr, "Secret key available: %s\n",
425
recipient->status == GPG_ERR_NO_SECKEY
426
? "No" : "Yes");
379
fprintf(stderr, "Public key algorithm: %s\n",
380
gpgme_pubkey_algo_name(recipient->pubkey_algo));
381
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
382
fprintf(stderr, "Secret key available: %s\n",
383
recipient->status == GPG_ERR_NO_SECKEY
384
? "No" : "Yes");
427
385
recipient = recipient->next;
428
386
}
429
387
}
432
390
}
433
391
434
392
if(debug){
435
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
393
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
436
394
}
437
395
438
396
/* Seek back to the beginning of the GPGME plaintext data buffer */
445
403
*plaintext = NULL;
446
404
while(true){
447
405
plaintext_capacity = incbuffer(plaintext,
448
(size_t)plaintext_length,
449
plaintext_capacity);
406
(size_t)plaintext_length,
407
plaintext_capacity);
450
408
if(plaintext_capacity == 0){
451
perror_plus("incbuffer");
452
plaintext_length = -1;
453
goto decrypt_end;
409
perror_plus("incbuffer");
410
plaintext_length = -1;
411
goto decrypt_end;
454
412
}
455
413
456
414
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
469
427
}
470
428
471
429
if(debug){
472
fprintf_plus(stderr, "Decrypted password is: ");
430
fprintf(stderr, "Decrypted password is: ");
473
431
for(ssize_t i = 0; i < plaintext_length; i++){
474
432
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
475
433
}
486
444
return plaintext_length;
487
445
}
488
446
489
__attribute__((warn_unused_result))
490
static const char *safer_gnutls_strerror(int value){
491
const char *ret = gnutls_strerror(value);
447
static const char * safer_gnutls_strerror(int value){
448
const char *ret = gnutls_strerror(value); /* Spurious warning from
449
-Wunreachable-code */
492
450
if(ret == NULL)
493
451
ret = "(unknown)";
494
452
return ret;
495
453
}
496
454
497
455
/* GnuTLS log function callback */
498
__attribute__((nonnull))
499
456
static void debuggnutls(__attribute__((unused)) int level,
500
457
const char* string){
501
fprintf_plus(stderr, "GnuTLS: %s", string);
458
fprintf(stderr, "GnuTLS: %s", string);
502
459
}
503
460
504
__attribute__((nonnull, warn_unused_result))
505
461
static int init_gnutls_global(const char *pubkeyfilename,
506
const char *seckeyfilename,
507
mandos_context *mc){
462
const char *seckeyfilename){
508
463
int ret;
509
464
510
465
if(debug){
511
fprintf_plus(stderr, "Initializing GnuTLS\n");
466
fprintf(stderr, "Initializing GnuTLS\n");
512
467
}
513
468
514
469
ret = gnutls_global_init();
515
470
if(ret != GNUTLS_E_SUCCESS){
516
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
517
safer_gnutls_strerror(ret));
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
518
473
return -1;
519
474
}
520
475
527
482
}
528
483
529
484
/* OpenPGP credentials */
530
ret = gnutls_certificate_allocate_credentials(&mc->cred);
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
531
486
if(ret != GNUTLS_E_SUCCESS){
532
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
533
safer_gnutls_strerror(ret));
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
534
489
gnutls_global_deinit();
535
490
return -1;
536
491
}
537
492
538
493
if(debug){
539
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
540
" secret key %s as GnuTLS credentials\n",
541
pubkeyfilename,
542
seckeyfilename);
494
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
495
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
496
seckeyfilename);
543
497
}
544
498
545
499
ret = gnutls_certificate_set_openpgp_key_file
546
(mc->cred, pubkeyfilename, seckeyfilename,
500
(mc.cred, pubkeyfilename, seckeyfilename,
547
501
GNUTLS_OPENPGP_FMT_BASE64);
548
502
if(ret != GNUTLS_E_SUCCESS){
549
fprintf_plus(stderr,
550
"Error[%d] while reading the OpenPGP key pair ('%s',"
551
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
552
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
553
safer_gnutls_strerror(ret));
503
fprintf(stderr,
504
"Error[%d] while reading the OpenPGP key pair ('%s',"
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
506
fprintf(stderr, "The GnuTLS error is: %s\n",
507
safer_gnutls_strerror(ret));
554
508
goto globalfail;
555
509
}
556
510
557
511
/* GnuTLS server initialization */
558
ret = gnutls_dh_params_init(&mc->dh_params);
512
ret = gnutls_dh_params_init(&mc.dh_params);
559
513
if(ret != GNUTLS_E_SUCCESS){
560
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
561
" initialization: %s\n",
562
safer_gnutls_strerror(ret));
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
563
516
goto globalfail;
564
517
}
565
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
518
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
566
519
if(ret != GNUTLS_E_SUCCESS){
567
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
568
safer_gnutls_strerror(ret));
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
569
522
goto globalfail;
570
523
}
571
524
572
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
525
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
573
526
574
527
return 0;
575
528
576
529
globalfail:
577
530
578
gnutls_certificate_free_credentials(mc->cred);
531
gnutls_certificate_free_credentials(mc.cred);
579
532
gnutls_global_deinit();
580
gnutls_dh_params_deinit(mc->dh_params);
533
gnutls_dh_params_deinit(mc.dh_params);
581
534
return -1;
582
535
}
583
536
584
__attribute__((nonnull, warn_unused_result))
585
static int init_gnutls_session(gnutls_session_t *session,
586
mandos_context *mc){
537
static int init_gnutls_session(gnutls_session_t *session){
587
538
int ret;
588
539
/* GnuTLS session creation */
589
540
do {
593
544
}
594
545
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
595
546
if(ret != GNUTLS_E_SUCCESS){
596
fprintf_plus(stderr,
597
"Error in GnuTLS session initialization: %s\n",
598
safer_gnutls_strerror(ret));
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
548
safer_gnutls_strerror(ret));
599
549
}
600
550
601
551
{
602
552
const char *err;
603
553
do {
604
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
554
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
605
555
if(quit_now){
606
556
gnutls_deinit(*session);
607
557
return -1;
608
558
}
609
559
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
610
560
if(ret != GNUTLS_E_SUCCESS){
611
fprintf_plus(stderr, "Syntax error at: %s\n", err);
612
fprintf_plus(stderr, "GnuTLS error: %s\n",
613
safer_gnutls_strerror(ret));
561
fprintf(stderr, "Syntax error at: %s\n", err);
562
fprintf(stderr, "GnuTLS error: %s\n",
563
safer_gnutls_strerror(ret));
614
564
gnutls_deinit(*session);
615
565
return -1;
616
566
}
618
568
619
569
do {
620
570
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
621
mc->cred);
571
mc.cred);
622
572
if(quit_now){
623
573
gnutls_deinit(*session);
624
574
return -1;
625
575
}
626
576
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
627
577
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
629
safer_gnutls_strerror(ret));
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
579
safer_gnutls_strerror(ret));
630
580
gnutls_deinit(*session);
631
581
return -1;
632
582
}
634
584
/* ignore client certificate if any. */
635
585
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
636
586
637
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
587
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
638
588
639
589
return 0;
640
590
}
644
594
__attribute__((unused)) const char *txt){}
645
595
646
596
/* Called when a Mandos server is found */
647
__attribute__((nonnull, warn_unused_result))
648
static int start_mandos_communication(const char *ip, in_port_t port,
597
static int start_mandos_communication(const char *ip, uint16_t port,
649
598
AvahiIfIndex if_index,
650
int af, mandos_context *mc){
599
int af){
651
600
int ret, tcp_sd = -1;
652
601
ssize_t sret;
653
struct sockaddr_storage to;
602
union {
603
struct sockaddr_in in;
604
struct sockaddr_in6 in6;
605
} to;
654
606
char *buffer = NULL;
655
607
char *decrypted_buffer = NULL;
656
608
size_t buffer_length = 0;
675
627
pf = PF_INET;
676
628
break;
677
629
default:
678
fprintf_plus(stderr, "Bad address family: %d\n", af);
630
fprintf(stderr, "Bad address family: %d\n", af);
679
631
errno = EINVAL;
680
632
return -1;
681
633
}
682
634
683
/* If the interface is specified and we have a list of interfaces */
684
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
685
/* Check if the interface is one of the interfaces we are using */
686
bool match = false;
687
{
688
char *interface = NULL;
689
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
690
interface))){
691
if(if_nametoindex(interface) == (unsigned int)if_index){
692
match = true;
693
break;
694
}
695
}
696
}
697
if(not match){
698
/* This interface does not match any in the list, so we don't
699
connect to the server */
700
if(debug){
701
char interface[IF_NAMESIZE];
702
if(if_indextoname((unsigned int)if_index, interface) == NULL){
703
perror_plus("if_indextoname");
704
} else {
705
fprintf_plus(stderr, "Skipping server on non-used interface"
706
" \"%s\"\n",
707
if_indextoname((unsigned int)if_index,
708
interface));
709
}
710
}
711
return -1;
712
}
713
}
714
715
ret = init_gnutls_session(&session, mc);
635
ret = init_gnutls_session(&session);
716
636
if(ret != 0){
717
637
return -1;
718
638
}
719
639
720
640
if(debug){
721
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
722
PRIuMAX "\n", ip, (uintmax_t)port);
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
642
"\n", ip, port);
723
643
}
724
644
725
645
tcp_sd = socket(pf, SOCK_STREAM, 0);
737
657
738
658
memset(&to, 0, sizeof(to));
739
659
if(af == AF_INET6){
740
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
660
to.in6.sin6_family = (sa_family_t)af;
661
ret = inet_pton(af, ip, &to.in6.sin6_addr);
742
662
} else { /* IPv4 */
743
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
744
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
663
to.in.sin_family = (sa_family_t)af;
664
ret = inet_pton(af, ip, &to.in.sin_addr);
745
665
}
746
666
if(ret < 0 ){
747
667
int e = errno;
751
671
}
752
672
if(ret == 0){
753
673
int e = errno;
754
fprintf_plus(stderr, "Bad address: %s\n", ip);
674
fprintf(stderr, "Bad address: %s\n", ip);
755
675
errno = e;
756
676
goto mandos_end;
757
677
}
758
678
if(af == AF_INET6){
759
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
760
if(IN6_IS_ADDR_LINKLOCAL
761
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
679
to.in6.sin6_port = htons(port); /* Spurious warnings from
680
-Wconversion and
681
-Wunreachable-code */
682
683
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
684
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
685
-Wunreachable-code*/
762
686
if(if_index == AVAHI_IF_UNSPEC){
763
fprintf_plus(stderr, "An IPv6 link-local address is"
764
" incomplete without a network interface\n");
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
765
689
errno = EINVAL;
766
690
goto mandos_end;
767
691
}
768
692
/* Set the network interface number as scope */
769
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
693
to.in6.sin6_scope_id = (uint32_t)if_index;
770
694
}
771
695
} else {
772
((struct sockaddr_in *)&to)->sin_port = htons(port);
696
to.in.sin_port = htons(port); /* Spurious warnings from
697
-Wconversion and
698
-Wunreachable-code */
773
699
}
774
700
775
701
if(quit_now){
783
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
784
710
perror_plus("if_indextoname");
785
711
} else {
786
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
787
"\n", ip, interface, (uintmax_t)port);
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
788
714
}
789
715
} else {
790
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
791
ip, (uintmax_t)port);
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
792
718
}
793
719
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
794
720
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
721
const char *pcret;
795
722
if(af == AF_INET6){
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in6),
798
addrstr, sizeof(addrstr), NULL, 0,
799
NI_NUMERICHOST);
723
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
724
sizeof(addrstr));
800
725
} else {
801
ret = getnameinfo((struct sockaddr *)&to,
802
sizeof(struct sockaddr_in),
803
addrstr, sizeof(addrstr), NULL, 0,
804
NI_NUMERICHOST);
726
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
727
sizeof(addrstr));
805
728
}
806
if(ret == EAI_SYSTEM){
807
perror_plus("getnameinfo");
808
} else if(ret != 0) {
809
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
810
} else if(strcmp(addrstr, ip) != 0){
811
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
729
if(pcret == NULL){
730
perror_plus("inet_ntop");
731
} else {
732
if(strcmp(addrstr, ip) != 0){
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
734
}
812
735
}
813
736
}
814
737
818
741
}
819
742
820
743
if(af == AF_INET6){
821
ret = connect(tcp_sd, (struct sockaddr *)&to,
822
sizeof(struct sockaddr_in6));
744
ret = connect(tcp_sd, &to.in6, sizeof(to));
823
745
} else {
824
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
825
sizeof(struct sockaddr_in));
746
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
826
747
}
827
748
if(ret < 0){
828
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
829
750
int e = errno;
830
751
perror_plus("connect");
831
752
errno = e;
843
764
while(true){
844
765
size_t out_size = strlen(out);
845
766
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
846
out_size - written));
767
out_size - written));
847
768
if(ret == -1){
848
769
int e = errno;
849
770
perror_plus("write");
869
790
}
870
791
871
792
if(debug){
872
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
873
794
}
874
795
875
796
if(quit_now){
877
798
goto mandos_end;
878
799
}
879
800
880
/* This casting via intptr_t is to eliminate warning about casting
881
an int to a pointer type. This is exactly how the GnuTLS Guile
882
function "set-session-transport-fd!" does it. */
883
gnutls_transport_set_ptr(session,
884
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
801
/* Spurious warning from -Wint-to-pointer-cast */
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
885
803
886
804
if(quit_now){
887
805
errno = EINTR;
898
816
899
817
if(ret != GNUTLS_E_SUCCESS){
900
818
if(debug){
901
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
902
820
gnutls_perror(ret);
903
821
}
904
822
errno = EPROTO;
908
826
/* Read OpenPGP packet that contains the wanted password */
909
827
910
828
if(debug){
911
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
912
" %s\n", ip);
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
830
ip);
913
831
}
914
832
915
833
while(true){
920
838
}
921
839
922
840
buffer_capacity = incbuffer(&buffer, buffer_length,
923
buffer_capacity);
841
buffer_capacity);
924
842
if(buffer_capacity == 0){
925
843
int e = errno;
926
844
perror_plus("incbuffer");
953
871
}
954
872
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
955
873
if(ret < 0){
956
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
957
"***\n");
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
958
875
gnutls_perror(ret);
959
876
errno = EPROTO;
960
877
goto mandos_end;
961
878
}
962
879
break;
963
880
default:
964
fprintf_plus(stderr, "Unknown error while reading data from"
965
" encrypted session with Mandos server\n");
881
fprintf(stderr, "Unknown error while reading data from"
882
" encrypted session with Mandos server\n");
966
883
gnutls_bye(session, GNUTLS_SHUT_RDWR);
967
884
errno = EIO;
968
885
goto mandos_end;
973
890
}
974
891
975
892
if(debug){
976
fprintf_plus(stderr, "Closing TLS session\n");
893
fprintf(stderr, "Closing TLS session\n");
977
894
}
978
895
979
896
if(quit_now){
991
908
992
909
if(buffer_length > 0){
993
910
ssize_t decrypted_buffer_size;
994
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
995
&decrypted_buffer, mc);
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
912
buffer_length,
913
&decrypted_buffer);
996
914
if(decrypted_buffer_size >= 0){
997
915
998
916
written = 0;
1008
926
if(ret == 0 and ferror(stdout)){
1009
927
int e = errno;
1010
928
if(debug){
1011
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1012
strerror(errno));
929
fprintf(stderr, "Error writing encrypted data: %s\n",
930
strerror(errno));
1013
931
}
1014
932
errno = e;
1015
933
goto mandos_end;
1046
964
return retval;
1047
965
}
1048
966
1049
__attribute__((nonnull))
1050
967
static void resolve_callback(AvahiSServiceResolver *r,
1051
968
AvahiIfIndex interface,
1052
969
AvahiProtocol proto,
1060
977
AVAHI_GCC_UNUSED AvahiStringList *txt,
1061
978
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1062
979
flags,
1063
void *mc){
1064
if(r == NULL){
1065
return;
1066
}
980
AVAHI_GCC_UNUSED void* userdata){
981
assert(r);
1067
982
1068
983
/* Called whenever a service has been resolved successfully or
1069
984
timed out */
1075
990
switch(event){
1076
991
default:
1077
992
case AVAHI_RESOLVER_FAILURE:
1078
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1079
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1080
domain,
1081
avahi_strerror(avahi_server_errno
1082
(((mandos_context*)mc)->server)));
993
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
994
" of type '%s' in domain '%s': %s\n", name, type, domain,
995
avahi_strerror(avahi_server_errno(mc.server)));
1083
996
break;
1084
997
1085
998
case AVAHI_RESOLVER_FOUND:
1087
1000
char ip[AVAHI_ADDRESS_STR_MAX];
1088
1001
avahi_address_snprint(ip, sizeof(ip), address);
1089
1002
if(debug){
1090
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1091
PRIdMAX ") on port %" PRIu16 "\n", name,
1092
host_name, ip, (intmax_t)interface, port);
1003
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1005
ip, (intmax_t)interface, port);
1093
1006
}
1094
int ret = start_mandos_communication(ip, (in_port_t)port,
1095
interface,
1096
avahi_proto_to_af(proto),
1097
mc);
1007
int ret = start_mandos_communication(ip, port, interface,
1008
avahi_proto_to_af(proto));
1098
1009
if(ret == 0){
1099
avahi_simple_poll_quit(simple_poll);
1010
avahi_simple_poll_quit(mc.simple_poll);
1100
1011
} else {
1101
if(not add_server(ip, (in_port_t)port, interface,
1102
avahi_proto_to_af(proto),
1103
&((mandos_context*)mc)->current_server)){
1104
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1105
" list\n", name);
1106
}
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
1107
1014
}
1108
1015
}
1109
1016
}
1119
1026
const char *domain,
1120
1027
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1121
1028
flags,
1122
void *mc){
1123
if(b == NULL){
1124
return;
1125
}
1029
AVAHI_GCC_UNUSED void* userdata){
1030
assert(b);
1126
1031
1127
1032
/* Called whenever a new services becomes available on the LAN or
1128
1033
is removed from the LAN */
1135
1040
default:
1136
1041
case AVAHI_BROWSER_FAILURE:
1137
1042
1138
fprintf_plus(stderr, "(Avahi browser) %s\n",
1139
avahi_strerror(avahi_server_errno
1140
(((mandos_context*)mc)->server)));
1141
avahi_simple_poll_quit(simple_poll);
1043
fprintf(stderr, "(Avahi browser) %s\n",
1044
avahi_strerror(avahi_server_errno(mc.server)));
1045
avahi_simple_poll_quit(mc.simple_poll);
1142
1046
return;
1143
1047
1144
1048
case AVAHI_BROWSER_NEW:
1147
1051
the callback function is called the Avahi server will free the
1148
1052
resolver for us. */
1149
1053
1150
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1151
interface, protocol, name, type,
1152
domain, protocol, 0,
1153
resolve_callback, mc) == NULL)
1154
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1155
" %s\n", name,
1156
avahi_strerror(avahi_server_errno
1157
(((mandos_context*)mc)->server)));
1054
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1055
name, type, domain, protocol, 0,
1056
resolve_callback, NULL) == NULL)
1057
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
1158
1059
break;
1159
1060
1160
1061
case AVAHI_BROWSER_REMOVE:
1163
1064
case AVAHI_BROWSER_ALL_FOR_NOW:
1164
1065
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1165
1066
if(debug){
1166
fprintf_plus(stderr, "No Mandos server found, still"
1167
" searching...\n");
1067
fprintf(stderr, "No Mandos server found, still searching...\n");
1168
1068
}
1169
1069
break;
1170
1070
}
1179
1079
signal_received = sig;
1180
1080
int old_errno = errno;
1181
1081
/* set main loop to exit */
1182
if(simple_poll != NULL){
1183
avahi_simple_poll_quit(simple_poll);
1082
if(mc.simple_poll != NULL){
1083
avahi_simple_poll_quit(mc.simple_poll);
1184
1084
}
1185
1085
errno = old_errno;
1186
1086
}
1187
1087
1188
__attribute__((nonnull, warn_unused_result))
1189
bool get_flags(const char *ifname, struct ifreq *ifr){
1190
int ret;
1191
error_t ret_errno;
1192
1193
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1194
if(s < 0){
1195
ret_errno = errno;
1196
perror_plus("socket");
1197
errno = ret_errno;
1198
return false;
1199
}
1200
strcpy(ifr->ifr_name, ifname);
1201
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1202
if(ret == -1){
1088
/*
1089
* This function determines if a directory entry in /sys/class/net
1090
* corresponds to an acceptable network device.
1091
* (This function is passed to scandir(3) as a filter function.)
1092
*/
1093
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
char *flagname = NULL;
1096
if(if_entry->d_name[0] == '.'){
1097
return 0;
1098
}
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1100
if_entry->d_name);
1101
if(ret < 0){
1102
perror_plus("asprintf");
1103
return 0;
1104
}
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
if(flags_fd == -1){
1107
perror_plus("open");
1108
free(flagname);
1109
return 0;
1110
}
1111
free(flagname);
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
flagstring[(size_t)to_read] = '\0';
1117
if(flagstring == NULL){
1118
perror_plus("malloc");
1119
close(flags_fd);
1120
return 0;
1121
}
1122
while(to_read > 0){
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1124
(size_t)to_read));
1125
if(ssret == -1){
1126
perror_plus("read");
1127
free(flagstring);
1128
close(flags_fd);
1129
return 0;
1130
}
1131
to_read -= ssret;
1132
if(ssret == 0){
1133
break;
1134
}
1135
}
1136
close(flags_fd);
1137
intmax_t tmpmax;
1138
char *tmp;
1139
errno = 0;
1140
tmpmax = strtoimax(flagstring, &tmp, 0);
1141
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1142
and not (isspace(*tmp)))
1143
or tmpmax != (ifreq_flags)tmpmax){
1203
1144
if(debug){
1204
ret_errno = errno;
1205
perror_plus("ioctl SIOCGIFFLAGS");
1206
errno = ret_errno;
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1207
1147
}
1208
return false;
1148
free(flagstring);
1149
return 0;
1209
1150
}
1210
return true;
1211
}
1212
1213
__attribute__((nonnull, warn_unused_result))
1214
bool good_flags(const char *ifname, const struct ifreq *ifr){
1215
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1216
1153
/* Reject the loopback device */
1217
if(ifr->ifr_flags & IFF_LOOPBACK){
1154
if(flags & IFF_LOOPBACK){
1218
1155
if(debug){
1219
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1220
ifname);
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1221
1158
}
1222
return false;
1159
return 0;
1223
1160
}
1224
1161
/* Accept point-to-point devices only if connect_to is specified */
1225
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1226
1163
if(debug){
1227
fprintf_plus(stderr, "Accepting point-to-point interface"
1228
" \"%s\"\n", ifname);
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1229
1166
}
1230
return true;
1167
return 1;
1231
1168
}
1232
1169
/* Otherwise, reject non-broadcast-capable devices */
1233
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1170
if(not (flags & IFF_BROADCAST)){
1234
1171
if(debug){
1235
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1236
" \"%s\"\n", ifname);
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1237
1174
}
1238
return false;
1175
return 0;
1239
1176
}
1240
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1241
if(ifr->ifr_flags & IFF_NOARP){
1178
if(flags & IFF_NOARP){
1242
1179
if(debug){
1243
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1244
ifname);
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1245
1182
}
1246
return false;
1183
return 0;
1247
1184
}
1248
1249
1185
/* Accept this device */
1250
1186
if(debug){
1251
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1252
}
1253
return true;
1254
}
1255
1256
/*
1257
* This function determines if a directory entry in /sys/class/net
1258
* corresponds to an acceptable network device.
1259
* (This function is passed to scandir(3) as a filter function.)
1260
*/
1261
__attribute__((nonnull, warn_unused_result))
1262
int good_interface(const struct dirent *if_entry){
1263
if(if_entry->d_name[0] == '.'){
1264
return 0;
1265
}
1266
1267
struct ifreq ifr;
1268
if(not get_flags(if_entry->d_name, &ifr)){
1269
if(debug){
1270
fprintf_plus(stderr, "Failed to get flags for interface "
1271
"\"%s\"\n", if_entry->d_name);
1272
}
1273
return 0;
1274
}
1275
1276
if(not good_flags(if_entry->d_name, &ifr)){
1277
return 0;
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
1278
1189
}
1279
1190
return 1;
1280
1191
}
1281
1192
1282
/*
1283
* This function determines if a network interface is up.
1284
*/
1285
__attribute__((nonnull, warn_unused_result))
1286
bool interface_is_up(const char *interface){
1287
struct ifreq ifr;
1288
if(not get_flags(interface, &ifr)){
1289
if(debug){
1290
fprintf_plus(stderr, "Failed to get flags for interface "
1291
"\"%s\"\n", interface);
1292
}
1293
return false;
1294
}
1295
1296
return (bool)(ifr.ifr_flags & IFF_UP);
1297
}
1298
1299
/*
1300
* This function determines if a network interface is running
1301
*/
1302
__attribute__((nonnull, warn_unused_result))
1303
bool interface_is_running(const char *interface){
1304
struct ifreq ifr;
1305
if(not get_flags(interface, &ifr)){
1306
if(debug){
1307
fprintf_plus(stderr, "Failed to get flags for interface "
1308
"\"%s\"\n", interface);
1309
}
1310
return false;
1311
}
1312
1313
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1314
}
1315
1316
__attribute__((nonnull, pure, warn_unused_result))
1317
1193
int notdotentries(const struct dirent *direntry){
1318
1194
/* Skip "." and ".." */
1319
1195
if(direntry->d_name[0] == '.'
1325
1201
return 1;
1326
1202
}
1327
1203
1328
/* Is this directory entry a runnable program? */
1329
__attribute__((nonnull, warn_unused_result))
1330
int runnable_hook(const struct dirent *direntry){
1331
int ret;
1332
size_t sret;
1333
struct stat st;
1334
1335
if((direntry->d_name)[0] == '\0'){
1336
/* Empty name? */
1337
return 0;
1338
}
1339
1340
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1341
"abcdefghijklmnopqrstuvwxyz"
1342
"0123456789"
1343
"_.-");
1344
if((direntry->d_name)[sret] != '\0'){
1345
/* Contains non-allowed characters */
1346
if(debug){
1347
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1348
direntry->d_name);
1349
}
1350
return 0;
1351
}
1352
1353
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1354
if(ret == -1){
1355
if(debug){
1356
perror_plus("Could not stat hook");
1357
}
1358
return 0;
1359
}
1360
if(not (S_ISREG(st.st_mode))){
1361
/* Not a regular file */
1362
if(debug){
1363
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1364
direntry->d_name);
1365
}
1366
return 0;
1367
}
1368
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1369
/* Not executable */
1370
if(debug){
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1372
direntry->d_name);
1373
}
1374
return 0;
1375
}
1376
if(debug){
1377
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1378
direntry->d_name);
1379
}
1380
return 1;
1381
}
1382
1383
__attribute__((nonnull, warn_unused_result))
1384
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1385
mandos_context *mc){
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1386
1205
int ret;
1387
1206
struct timespec now;
1388
1207
struct timespec waited_time;
1389
1208
intmax_t block_time;
1390
1209
1391
1210
while(true){
1392
if(mc->current_server == NULL){
1393
if(debug){
1394
fprintf_plus(stderr, "Wait until first server is found."
1395
" No timeout!\n");
1211
if(mc.current_server == NULL){
1212
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1396
1215
}
1397
1216
ret = avahi_simple_poll_iterate(s, -1);
1398
1217
} else {
1399
if(debug){
1400
fprintf_plus(stderr, "Check current_server if we should run"
1401
" it, or wait\n");
1218
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1402
1221
}
1403
1222
/* the current time */
1404
1223
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1409
1228
/* Calculating in ms how long time between now and server
1410
1229
who we visted longest time ago. Now - last seen. */
1411
1230
waited_time.tv_sec = (now.tv_sec
1412
- mc->current_server->last_seen.tv_sec);
1231
- mc.current_server->last_seen.tv_sec);
1413
1232
waited_time.tv_nsec = (now.tv_nsec
1414
- mc->current_server->last_seen.tv_nsec);
1233
- mc.current_server->last_seen.tv_nsec);
1415
1234
/* total time is 10s/10,000ms.
1416
1235
Converting to s from ms by dividing by 1,000,
1417
1236
and ns to ms by dividing by 1,000,000. */
1419
1238
- ((intmax_t)waited_time.tv_sec * 1000))
1420
1239
- ((intmax_t)waited_time.tv_nsec / 1000000));
1421
1240
1422
if(debug){
1423
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1424
block_time);
1241
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1425
1243
}
1426
1244
1427
1245
if(block_time <= 0){
1428
ret = start_mandos_communication(mc->current_server->ip,
1429
mc->current_server->port,
1430
mc->current_server->if_index,
1431
mc->current_server->af, mc);
1246
ret = start_mandos_communication(mc.current_server->ip,
1247
mc.current_server->port,
1248
mc.current_server->if_index,
1249
mc.current_server->af);
1432
1250
if(ret == 0){
1433
avahi_simple_poll_quit(s);
1251
avahi_simple_poll_quit(mc.simple_poll);
1434
1252
return 0;
1435
1253
}
1436
1254
ret = clock_gettime(CLOCK_MONOTONIC,
1437
&mc->current_server->last_seen);
1255
&mc.current_server->last_seen);
1438
1256
if(ret == -1){
1439
1257
perror_plus("clock_gettime");
1440
1258
return -1;
1441
1259
}
1442
mc->current_server = mc->current_server->next;
1260
mc.current_server = mc.current_server->next;
1443
1261
block_time = 0; /* Call avahi to find new Mandos
1444
1262
servers, but don't block */
1445
1263
}
1447
1265
ret = avahi_simple_poll_iterate(s, (int)block_time);
1448
1266
}
1449
1267
if(ret != 0){
1450
if(ret > 0 or errno != EINTR){
1268
if (ret > 0 or errno != EINTR) {
1451
1269
return (ret != 1) ? ret : 0;
1452
1270
}
1453
1271
}
1454
1272
}
1455
1273
}
1456
1274
1457
/* Set effective uid to 0, return errno */
1458
__attribute__((warn_unused_result))
1459
error_t raise_privileges(void){
1460
error_t old_errno = errno;
1461
error_t ret_errno = 0;
1462
if(seteuid(0) == -1){
1463
ret_errno = errno;
1464
}
1465
errno = old_errno;
1466
return ret_errno;
1467
}
1468
1469
/* Set effective and real user ID to 0. Return errno. */
1470
__attribute__((warn_unused_result))
1471
error_t raise_privileges_permanently(void){
1472
error_t old_errno = errno;
1473
error_t ret_errno = raise_privileges();
1474
if(ret_errno != 0){
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
if(setuid(0) == -1){
1479
ret_errno = errno;
1480
}
1481
errno = old_errno;
1482
return ret_errno;
1483
}
1484
1485
/* Set effective user ID to unprivileged saved user ID */
1486
__attribute__((warn_unused_result))
1487
error_t lower_privileges(void){
1488
error_t old_errno = errno;
1489
error_t ret_errno = 0;
1490
if(seteuid(uid) == -1){
1491
ret_errno = errno;
1492
}
1493
errno = old_errno;
1494
return ret_errno;
1495
}
1496
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1503
ret_errno = errno;
1504
}
1505
errno = old_errno;
1506
return ret_errno;
1507
}
1508
1509
__attribute__((nonnull))
1510
void run_network_hooks(const char *mode, const char *interface,
1511
const float delay){
1512
struct dirent **direntries = NULL;
1513
if(hookdir_fd == -1){
1514
hookdir_fd = open(hookdir, O_RDONLY);
1515
if(hookdir_fd == -1){
1516
if(errno == ENOENT){
1517
if(debug){
1518
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1519
" found\n", hookdir);
1520
}
1521
} else {
1522
perror_plus("open");
1523
}
1524
return;
1525
}
1526
}
1527
#ifdef __GLIBC__
1528
#if __GLIBC_PREREQ(2, 15)
1529
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1530
runnable_hook, alphasort);
1531
#else /* not __GLIBC_PREREQ(2, 15) */
1532
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1533
alphasort);
1534
#endif /* not __GLIBC_PREREQ(2, 15) */
1535
#else /* not __GLIBC__ */
1536
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1537
alphasort);
1538
#endif /* not __GLIBC__ */
1539
if(numhooks == -1){
1540
perror_plus("scandir");
1541
return;
1542
}
1543
struct dirent *direntry;
1544
int ret;
1545
int devnull = open("/dev/null", O_RDONLY);
1546
for(int i = 0; i < numhooks; i++){
1547
direntry = direntries[i];
1548
if(debug){
1549
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1550
direntry->d_name);
1551
}
1552
pid_t hook_pid = fork();
1553
if(hook_pid == 0){
1554
/* Child */
1555
/* Raise privileges */
1556
errno = raise_privileges_permanently();
1557
if(errno != 0){
1558
perror_plus("Failed to raise privileges");
1559
_exit(EX_NOPERM);
1560
}
1561
/* Set group */
1562
errno = 0;
1563
ret = setgid(0);
1564
if(ret == -1){
1565
perror_plus("setgid");
1566
_exit(EX_NOPERM);
1567
}
1568
/* Reset supplementary groups */
1569
errno = 0;
1570
ret = setgroups(0, NULL);
1571
if(ret == -1){
1572
perror_plus("setgroups");
1573
_exit(EX_NOPERM);
1574
}
1575
ret = dup2(devnull, STDIN_FILENO);
1576
if(ret == -1){
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1578
_exit(EX_OSERR);
1579
}
1580
ret = close(devnull);
1581
if(ret == -1){
1582
perror_plus("close");
1583
_exit(EX_OSERR);
1584
}
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1586
if(ret == -1){
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1588
_exit(EX_OSERR);
1589
}
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1591
if(ret == -1){
1592
perror_plus("setenv");
1593
_exit(EX_OSERR);
1594
}
1595
ret = setenv("DEVICE", interface, 1);
1596
if(ret == -1){
1597
perror_plus("setenv");
1598
_exit(EX_OSERR);
1599
}
1600
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1601
if(ret == -1){
1602
perror_plus("setenv");
1603
_exit(EX_OSERR);
1604
}
1605
ret = setenv("MODE", mode, 1);
1606
if(ret == -1){
1607
perror_plus("setenv");
1608
_exit(EX_OSERR);
1609
}
1610
char *delaystring;
1611
ret = asprintf(&delaystring, "%f", (double)delay);
1612
if(ret == -1){
1613
perror_plus("asprintf");
1614
_exit(EX_OSERR);
1615
}
1616
ret = setenv("DELAY", delaystring, 1);
1617
if(ret == -1){
1618
free(delaystring);
1619
perror_plus("setenv");
1620
_exit(EX_OSERR);
1621
}
1622
free(delaystring);
1623
if(connect_to != NULL){
1624
ret = setenv("CONNECT", connect_to, 1);
1625
if(ret == -1){
1626
perror_plus("setenv");
1627
_exit(EX_OSERR);
1628
}
1629
}
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1631
if(hook_fd == -1){
1632
perror_plus("openat");
1633
_exit(EXIT_FAILURE);
1634
}
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1636
perror_plus("close");
1637
_exit(EXIT_FAILURE);
1638
}
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1640
environ) == -1){
1641
perror_plus("fexecve");
1642
_exit(EXIT_FAILURE);
1643
}
1644
} else {
1645
int status;
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
perror_plus("waitpid");
1648
continue;
1649
}
1650
if(WIFEXITED(status)){
1651
if(WEXITSTATUS(status) != 0){
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
" with status %d\n", direntry->d_name,
1654
WEXITSTATUS(status));
1655
continue;
1656
}
1657
} else if(WIFSIGNALED(status)){
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
" signal %d\n", direntry->d_name,
1660
WTERMSIG(status));
1661
continue;
1662
} else {
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
" crashed\n", direntry->d_name);
1665
continue;
1666
}
1667
}
1668
if(debug){
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1670
direntry->d_name);
1671
}
1672
}
1673
free(direntries);
1674
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1675
perror_plus("close");
1676
} else {
1677
hookdir_fd = -1;
1678
}
1679
close(devnull);
1680
}
1681
1682
__attribute__((nonnull, warn_unused_result))
1683
error_t bring_up_interface(const char *const interface,
1684
const float delay){
1685
error_t old_errno = errno;
1686
int ret;
1687
struct ifreq network;
1688
unsigned int if_index = if_nametoindex(interface);
1689
if(if_index == 0){
1690
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1691
errno = old_errno;
1692
return ENXIO;
1693
}
1694
1695
if(quit_now){
1696
errno = old_errno;
1697
return EINTR;
1698
}
1699
1700
if(not interface_is_up(interface)){
1701
error_t ret_errno = 0, ioctl_errno = 0;
1702
if(not get_flags(interface, &network)){
1703
ret_errno = errno;
1704
fprintf_plus(stderr, "Failed to get flags for interface "
1705
"\"%s\"\n", interface);
1706
errno = old_errno;
1707
return ret_errno;
1708
}
1709
network.ifr_flags |= IFF_UP; /* set flag */
1710
1711
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1712
if(sd == -1){
1713
ret_errno = errno;
1714
perror_plus("socket");
1715
errno = old_errno;
1716
return ret_errno;
1717
}
1718
1719
if(quit_now){
1720
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1721
if(ret == -1){
1722
perror_plus("close");
1723
}
1724
errno = old_errno;
1725
return EINTR;
1726
}
1727
1728
if(debug){
1729
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1730
interface);
1731
}
1732
1733
/* Raise privileges */
1734
ret_errno = raise_privileges();
1735
if(ret_errno != 0){
1736
errno = ret_errno;
1737
perror_plus("Failed to raise privileges");
1738
}
1739
1740
#ifdef __linux__
1741
int ret_linux;
1742
bool restore_loglevel = false;
1743
if(ret_errno == 0){
1744
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1745
messages about the network interface to mess up the prompt */
1746
ret_linux = klogctl(8, NULL, 5);
1747
if(ret_linux == -1){
1748
perror_plus("klogctl");
1749
} else {
1750
restore_loglevel = true;
1751
}
1752
}
1753
#endif /* __linux__ */
1754
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1755
ioctl_errno = errno;
1756
#ifdef __linux__
1757
if(restore_loglevel){
1758
ret_linux = klogctl(7, NULL, 0);
1759
if(ret_linux == -1){
1760
perror_plus("klogctl");
1761
}
1762
}
1763
#endif /* __linux__ */
1764
1765
/* If raise_privileges() succeeded above */
1766
if(ret_errno == 0){
1767
/* Lower privileges */
1768
ret_errno = lower_privileges();
1769
if(ret_errno != 0){
1770
errno = ret_errno;
1771
perror_plus("Failed to lower privileges");
1772
}
1773
}
1774
1775
/* Close the socket */
1776
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1777
if(ret == -1){
1778
perror_plus("close");
1779
}
1780
1781
if(ret_setflags == -1){
1782
errno = ioctl_errno;
1783
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1784
errno = old_errno;
1785
return ioctl_errno;
1786
}
1787
} else if(debug){
1788
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1789
interface);
1790
}
1791
1792
/* Sleep checking until interface is running.
1793
Check every 0.25s, up to total time of delay */
1794
for(int i=0; i < delay * 4; i++){
1795
if(interface_is_running(interface)){
1796
break;
1797
}
1798
struct timespec sleeptime = { .tv_nsec = 250000000 };
1799
ret = nanosleep(&sleeptime, NULL);
1800
if(ret == -1 and errno != EINTR){
1801
perror_plus("nanosleep");
1802
}
1803
}
1804
1805
errno = old_errno;
1806
return 0;
1807
}
1808
1809
__attribute__((nonnull, warn_unused_result))
1810
error_t take_down_interface(const char *const interface){
1811
error_t old_errno = errno;
1812
struct ifreq network;
1813
unsigned int if_index = if_nametoindex(interface);
1814
if(if_index == 0){
1815
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1816
errno = old_errno;
1817
return ENXIO;
1818
}
1819
if(interface_is_up(interface)){
1820
error_t ret_errno = 0, ioctl_errno = 0;
1821
if(not get_flags(interface, &network) and debug){
1822
ret_errno = errno;
1823
fprintf_plus(stderr, "Failed to get flags for interface "
1824
"\"%s\"\n", interface);
1825
errno = old_errno;
1826
return ret_errno;
1827
}
1828
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1829
1830
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1831
if(sd == -1){
1832
ret_errno = errno;
1833
perror_plus("socket");
1834
errno = old_errno;
1835
return ret_errno;
1836
}
1837
1838
if(debug){
1839
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1840
interface);
1841
}
1842
1843
/* Raise privileges */
1844
ret_errno = raise_privileges();
1845
if(ret_errno != 0){
1846
errno = ret_errno;
1847
perror_plus("Failed to raise privileges");
1848
}
1849
1850
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1851
ioctl_errno = errno;
1852
1853
/* If raise_privileges() succeeded above */
1854
if(ret_errno == 0){
1855
/* Lower privileges */
1856
ret_errno = lower_privileges();
1857
if(ret_errno != 0){
1858
errno = ret_errno;
1859
perror_plus("Failed to lower privileges");
1860
}
1861
}
1862
1863
/* Close the socket */
1864
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1865
if(ret == -1){
1866
perror_plus("close");
1867
}
1868
1869
if(ret_setflags == -1){
1870
errno = ioctl_errno;
1871
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1872
errno = old_errno;
1873
return ioctl_errno;
1874
}
1875
} else if(debug){
1876
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1877
interface);
1878
}
1879
1880
errno = old_errno;
1881
return 0;
1882
}
1883
1884
1275
int main(int argc, char *argv[]){
1885
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1886
.priority = "SECURE256:!CTYPE-X.509:"
1887
"+CTYPE-OPENPGP", .current_server = NULL,
1888
.interfaces = NULL, .interfaces_size = 0 };
1889
1276
AvahiSServiceBrowser *sb = NULL;
1890
error_t ret_errno;
1277
int error;
1891
1278
int ret;
1892
1279
intmax_t tmpmax;
1893
1280
char *tmp;
1894
1281
int exitcode = EXIT_SUCCESS;
1895
char *interfaces_to_take_down = NULL;
1896
size_t interfaces_to_take_down_size = 0;
1897
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1898
char old_tempdir[] = "/tmp/mandosXXXXXX";
1899
char *tempdir = NULL;
1282
const char *interface = "";
1283
struct ifreq network;
1284
int sd = -1;
1285
bool take_down_interface = false;
1286
uid_t uid;
1287
gid_t gid;
1288
char tempdir[] = "/tmp/mandosXXXXXX";
1289
bool tempdir_created = false;
1900
1290
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1901
1291
const char *seckey = PATHDIR "/" SECKEY;
1902
1292
const char *pubkey = PATHDIR "/" PUBKEY;
1903
char *interfaces_hooks = NULL;
1904
1293
1905
1294
bool gnutls_initialized = false;
1906
1295
bool gpgme_initialized = false;
1968
1357
.group = 2 },
1969
1358
{ .name = "retry", .key = 132,
1970
1359
.arg = "SECONDS",
1971
.doc = "Retry interval used when denied by the Mandos server",
1972
.group = 2 },
1973
{ .name = "network-hook-dir", .key = 133,
1974
.arg = "DIR",
1975
.doc = "Directory where network hooks are located",
1360
.doc = "Retry interval used when denied by the mandos server",
1976
1361
.group = 2 },
1977
1362
/*
1978
1363
* These reproduce what we would get without ARGP_NO_HELP
1997
1382
connect_to = arg;
1998
1383
break;
1999
1384
case 'i': /* --interface */
2000
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2001
arg, (int)',');
2002
if(ret_errno != 0){
2003
argp_error(state, "%s", strerror(ret_errno));
2004
}
1385
interface = arg;
2005
1386
break;
2006
1387
case 's': /* --seckey */
2007
1388
seckey = arg;
2036
1417
argp_error(state, "Bad retry interval");
2037
1418
}
2038
1419
break;
2039
case 133: /* --network-hook-dir */
2040
hookdir = arg;
2041
break;
2042
1420
/*
2043
1421
* These reproduce what we would get without ARGP_NO_HELP
2044
1422
*/
2050
1428
argp_state_help(state, state->out_stream,
2051
1429
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2052
1430
case 'V': /* --version */
2053
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
2054
1432
exit(argp_err_exit_status);
2055
1433
break;
2056
1434
default:
2083
1461
{
2084
1462
/* Work around Debian bug #633582:
2085
1463
<http://bugs.debian.org/633582> */
2086
2087
/* Re-raise privileges */
2088
ret_errno = raise_privileges();
2089
if(ret_errno != 0){
2090
errno = ret_errno;
2091
perror_plus("Failed to raise privileges");
2092
} else {
2093
struct stat st;
2094
2095
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2096
int seckey_fd = open(seckey, O_RDONLY);
2097
if(seckey_fd == -1){
2098
perror_plus("open");
2099
} else {
2100
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2101
if(ret == -1){
2102
perror_plus("fstat");
2103
} else {
2104
if(S_ISREG(st.st_mode)
2105
and st.st_uid == 0 and st.st_gid == 0){
2106
ret = fchown(seckey_fd, uid, gid);
2107
if(ret == -1){
2108
perror_plus("fchown");
2109
}
2110
}
2111
}
2112
TEMP_FAILURE_RETRY(close(seckey_fd));
2113
}
2114
}
2115
2116
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2117
int pubkey_fd = open(pubkey, O_RDONLY);
2118
if(pubkey_fd == -1){
2119
perror_plus("open");
2120
} else {
2121
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2122
if(ret == -1){
2123
perror_plus("fstat");
2124
} else {
2125
if(S_ISREG(st.st_mode)
2126
and st.st_uid == 0 and st.st_gid == 0){
2127
ret = fchown(pubkey_fd, uid, gid);
2128
if(ret == -1){
2129
perror_plus("fchown");
2130
}
2131
}
2132
}
2133
TEMP_FAILURE_RETRY(close(pubkey_fd));
2134
}
2135
}
2136
2137
/* Lower privileges */
2138
ret_errno = lower_privileges();
2139
if(ret_errno != 0){
2140
errno = ret_errno;
2141
perror_plus("Failed to lower privileges");
2142
}
2143
}
2144
}
2145
2146
/* Remove invalid interface names (except "none") */
2147
{
2148
char *interface = NULL;
2149
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2150
interface))){
2151
if(strcmp(interface, "none") != 0
2152
and if_nametoindex(interface) == 0){
2153
if(interface[0] != '\0'){
2154
fprintf_plus(stderr, "Not using nonexisting interface"
2155
" \"%s\"\n", interface);
2156
}
2157
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2158
interface = NULL;
2159
}
2160
}
2161
}
2162
2163
/* Run network hooks */
2164
{
2165
if(mc.interfaces != NULL){
2166
interfaces_hooks = malloc(mc.interfaces_size);
2167
if(interfaces_hooks == NULL){
2168
perror_plus("malloc");
2169
goto end;
2170
}
2171
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2172
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2173
}
2174
run_network_hooks("start", interfaces_hooks != NULL ?
2175
interfaces_hooks : "", delay);
1464
struct stat st;
1465
1466
/* Re-raise priviliges */
1467
errno = 0;
1468
ret = seteuid(0);
1469
if(ret == -1){
1470
perror_plus("seteuid");
1471
}
1472
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1477
} else {
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
if(ret == -1){
1480
perror_plus("fstat");
1481
} else {
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1484
if(ret == -1){
1485
perror_plus("fchown");
1486
}
1487
}
1488
}
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1490
}
1491
}
1492
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1497
} else {
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1499
if(ret == -1){
1500
perror_plus("fstat");
1501
} else {
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1504
if(ret == -1){
1505
perror_plus("fchown");
1506
}
1507
}
1508
}
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1510
}
1511
}
1512
1513
/* Lower privileges */
1514
errno = 0;
1515
ret = seteuid(uid);
1516
if(ret == -1){
1517
perror_plus("seteuid");
1518
}
2176
1519
}
2177
1520
2178
1521
if(not debug){
2179
1522
avahi_set_log_function(empty_log);
2180
1523
}
1524
1525
if(interface[0] == '\0'){
1526
struct dirent **direntries;
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1528
alphasort);
1529
if(ret >= 1){
1530
/* Pick the first good interface */
1531
interface = strdup(direntries[0]->d_name);
1532
if(debug){
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1534
}
1535
if(interface == NULL){
1536
perror_plus("malloc");
1537
free(direntries);
1538
exitcode = EXIT_FAILURE;
1539
goto end;
1540
}
1541
free(direntries);
1542
} else {
1543
free(direntries);
1544
fprintf(stderr, "Could not find a network interface\n");
1545
exitcode = EXIT_FAILURE;
1546
goto end;
1547
}
1548
}
2181
1549
2182
1550
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2183
1551
from the signal handler */
2184
1552
/* Initialize the pseudo-RNG for Avahi */
2185
1553
srand((unsigned int) time(NULL));
2186
simple_poll = avahi_simple_poll_new();
2187
if(simple_poll == NULL){
2188
fprintf_plus(stderr,
2189
"Avahi: Failed to create simple poll object.\n");
1554
mc.simple_poll = avahi_simple_poll_new();
1555
if(mc.simple_poll == NULL){
1556
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2190
1557
exitcode = EX_UNAVAILABLE;
2191
1558
goto end;
2192
1559
}
2254
1621
}
2255
1622
}
2256
1623
2257
/* If no interfaces were specified, make a list */
2258
if(mc.interfaces == NULL){
2259
struct dirent **direntries = NULL;
2260
/* Look for any good interfaces */
2261
ret = scandir(sys_class_net, &direntries, good_interface,
2262
alphasort);
2263
if(ret >= 1){
2264
/* Add all found interfaces to interfaces list */
2265
for(int i = 0; i < ret; ++i){
2266
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2267
direntries[i]->d_name);
2268
if(ret_errno != 0){
2269
errno = ret_errno;
2270
perror_plus("argz_add");
2271
continue;
2272
}
2273
if(debug){
2274
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2275
direntries[i]->d_name);
2276
}
2277
}
2278
free(direntries);
1624
/* If the interface is down, bring it up */
1625
if(strcmp(interface, "none") != 0){
1626
if_index = (AvahiIfIndex) if_nametoindex(interface);
1627
if(if_index == 0){
1628
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1629
exitcode = EX_UNAVAILABLE;
1630
goto end;
1631
}
1632
1633
if(quit_now){
1634
goto end;
1635
}
1636
1637
/* Re-raise priviliges */
1638
errno = 0;
1639
ret = seteuid(0);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
1644
#ifdef __linux__
1645
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1646
messages about the network interface to mess up the prompt */
1647
ret = klogctl(8, NULL, 5);
1648
bool restore_loglevel = true;
1649
if(ret == -1){
1650
restore_loglevel = false;
1651
perror_plus("klogctl");
1652
}
1653
#endif /* __linux__ */
1654
1655
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1656
if(sd < 0){
1657
perror_plus("socket");
1658
exitcode = EX_OSERR;
1659
#ifdef __linux__
1660
if(restore_loglevel){
1661
ret = klogctl(7, NULL, 0);
1662
if(ret == -1){
1663
perror_plus("klogctl");
1664
}
1665
}
1666
#endif /* __linux__ */
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
goto end;
1674
}
1675
strcpy(network.ifr_name, interface);
1676
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1677
if(ret == -1){
1678
perror_plus("ioctl SIOCGIFFLAGS");
1679
#ifdef __linux__
1680
if(restore_loglevel){
1681
ret = klogctl(7, NULL, 0);
1682
if(ret == -1){
1683
perror_plus("klogctl");
1684
}
1685
}
1686
#endif /* __linux__ */
1687
exitcode = EX_OSERR;
1688
/* Lower privileges */
1689
errno = 0;
1690
ret = seteuid(uid);
1691
if(ret == -1){
1692
perror_plus("seteuid");
1693
}
1694
goto end;
1695
}
1696
if((network.ifr_flags & IFF_UP) == 0){
1697
network.ifr_flags |= IFF_UP;
1698
take_down_interface = true;
1699
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1700
if(ret == -1){
1701
take_down_interface = false;
1702
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1703
exitcode = EX_OSERR;
1704
#ifdef __linux__
1705
if(restore_loglevel){
1706
ret = klogctl(7, NULL, 0);
1707
if(ret == -1){
1708
perror_plus("klogctl");
1709
}
1710
}
1711
#endif /* __linux__ */
1712
/* Lower privileges */
1713
errno = 0;
1714
ret = seteuid(uid);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
}
1718
goto end;
1719
}
1720
}
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
1724
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1725
if(ret == -1){
1726
perror_plus("ioctl SIOCGIFFLAGS");
1727
} else if(network.ifr_flags & IFF_RUNNING){
1728
break;
1729
}
1730
struct timespec sleeptime = { .tv_nsec = 250000000 };
1731
ret = nanosleep(&sleeptime, NULL);
1732
if(ret == -1 and errno != EINTR){
1733
perror_plus("nanosleep");
1734
}
1735
}
1736
if(not take_down_interface){
1737
/* We won't need the socket anymore */
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
if(ret == -1){
1740
perror_plus("close");
1741
}
1742
}
1743
#ifdef __linux__
1744
if(restore_loglevel){
1745
/* Restores kernel loglevel to default */
1746
ret = klogctl(7, NULL, 0);
1747
if(ret == -1){
1748
perror_plus("klogctl");
1749
}
1750
}
1751
#endif /* __linux__ */
1752
/* Lower privileges */
1753
errno = 0;
1754
if(take_down_interface){
1755
/* Lower privileges */
1756
ret = seteuid(uid);
1757
if(ret == -1){
1758
perror_plus("seteuid");
1759
}
2279
1760
} else {
2280
if(ret == 0){
2281
free(direntries);
2282
}
2283
fprintf_plus(stderr, "Could not find a network interface\n");
2284
exitcode = EXIT_FAILURE;
2285
goto end;
2286
}
2287
}
2288
2289
/* Bring up interfaces which are down, and remove any "none"s */
2290
{
2291
char *interface = NULL;
2292
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2293
interface))){
2294
/* If interface name is "none", stop bringing up interfaces.
2295
Also remove all instances of "none" from the list */
2296
if(strcmp(interface, "none") == 0){
2297
argz_delete(&mc.interfaces, &mc.interfaces_size,
2298
interface);
2299
interface = NULL;
2300
while((interface = argz_next(mc.interfaces,
2301
mc.interfaces_size, interface))){
2302
if(strcmp(interface, "none") == 0){
2303
argz_delete(&mc.interfaces, &mc.interfaces_size,
2304
interface);
2305
interface = NULL;
2306
}
2307
}
2308
break;
2309
}
2310
bool interface_was_up = interface_is_up(interface);
2311
errno = bring_up_interface(interface, delay);
2312
if(not interface_was_up){
2313
if(errno != 0){
2314
perror_plus("Failed to bring up interface");
2315
} else {
2316
errno = argz_add(&interfaces_to_take_down,
2317
&interfaces_to_take_down_size,
2318
interface);
2319
if(errno != 0){
2320
perror_plus("argz_add");
2321
}
2322
}
2323
}
2324
}
2325
if(debug and (interfaces_to_take_down == NULL)){
2326
fprintf_plus(stderr, "No interfaces were brought up\n");
2327
}
2328
}
2329
2330
/* If we only got one interface, explicitly use only that one */
2331
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2332
if(debug){
2333
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2334
mc.interfaces);
2335
}
2336
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1761
/* Lower privileges permanently */
1762
ret = setuid(uid);
1763
if(ret == -1){
1764
perror_plus("setuid");
1765
}
1766
}
2337
1767
}
2338
1768
2339
1769
if(quit_now){
2340
1770
goto end;
2341
1771
}
2342
1772
2343
ret = init_gnutls_global(pubkey, seckey, &mc);
1773
ret = init_gnutls_global(pubkey, seckey);
2344
1774
if(ret == -1){
2345
fprintf_plus(stderr, "init_gnutls_global failed\n");
1775
fprintf(stderr, "init_gnutls_global failed\n");
2346
1776
exitcode = EX_UNAVAILABLE;
2347
1777
goto end;
2348
1778
} else {
2353
1783
goto end;
2354
1784
}
2355
1785
2356
/* Try /run/tmp before /tmp */
2357
tempdir = mkdtemp(run_tempdir);
2358
if(tempdir == NULL and errno == ENOENT){
2359
if(debug){
2360
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2361
run_tempdir, old_tempdir);
2362
}
2363
tempdir = mkdtemp(old_tempdir);
2364
}
2365
if(tempdir == NULL){
1786
if(mkdtemp(tempdir) == NULL){
2366
1787
perror_plus("mkdtemp");
2367
1788
goto end;
2368
1789
}
1790
tempdir_created = true;
2369
1791
2370
1792
if(quit_now){
2371
1793
goto end;
2372
1794
}
2373
1795
2374
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2375
fprintf_plus(stderr, "init_gpgme failed\n");
1796
if(not init_gpgme(pubkey, seckey, tempdir)){
1797
fprintf(stderr, "init_gpgme failed\n");
2376
1798
exitcode = EX_UNAVAILABLE;
2377
1799
goto end;
2378
1800
} else {
2387
1809
/* Connect directly, do not use Zeroconf */
2388
1810
/* (Mainly meant for debugging) */
2389
1811
char *address = strrchr(connect_to, ':');
2390
2391
1812
if(address == NULL){
2392
fprintf_plus(stderr, "No colon in address\n");
1813
fprintf(stderr, "No colon in address\n");
2393
1814
exitcode = EX_USAGE;
2394
1815
goto end;
2395
1816
}
2398
1819
goto end;
2399
1820
}
2400
1821
2401
in_port_t port;
1822
uint16_t port;
2402
1823
errno = 0;
2403
1824
tmpmax = strtoimax(address+1, &tmp, 10);
2404
1825
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2405
or tmpmax != (in_port_t)tmpmax){
2406
fprintf_plus(stderr, "Bad port number\n");
1826
or tmpmax != (uint16_t)tmpmax){
1827
fprintf(stderr, "Bad port number\n");
2407
1828
exitcode = EX_USAGE;
2408
1829
goto end;
2409
1830
}
2410
1831
2411
1832
if(quit_now){
2412
1833
goto end;
2413
1834
}
2414
1835
2415
port = (in_port_t)tmpmax;
1836
port = (uint16_t)tmpmax;
2416
1837
*address = '\0';
2417
1838
/* Colon in address indicates IPv6 */
2418
1839
int af;
2434
1855
}
2435
1856
2436
1857
while(not quit_now){
2437
ret = start_mandos_communication(address, port, if_index, af,
2438
&mc);
1858
ret = start_mandos_communication(address, port, if_index, af);
2439
1859
if(quit_now or ret == 0){
2440
1860
break;
2441
1861
}
2442
1862
if(debug){
2443
fprintf_plus(stderr, "Retrying in %d seconds\n",
2444
(int)retry_interval);
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
2445
1865
}
2446
sleep((unsigned int)retry_interval);
1866
sleep((int)retry_interval);
2447
1867
}
2448
1868
2449
if(not quit_now){
1869
if (not quit_now){
2450
1870
exitcode = EXIT_SUCCESS;
2451
1871
}
2452
1872
2453
1873
goto end;
2454
1874
}
2455
1875
2467
1887
config.publish_domain = 0;
2468
1888
2469
1889
/* Allocate a new server */
2470
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2471
&config, NULL, NULL, &ret_errno);
1890
mc.server = avahi_server_new(avahi_simple_poll_get
1891
(mc.simple_poll), &config, NULL,
1892
NULL, &error);
2472
1893
2473
1894
/* Free the Avahi configuration data */
2474
1895
avahi_server_config_free(&config);
2476
1897
2477
1898
/* Check if creating the Avahi server object succeeded */
2478
1899
if(mc.server == NULL){
2479
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2480
avahi_strerror(ret_errno));
1900
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
avahi_strerror(error));
2481
1902
exitcode = EX_UNAVAILABLE;
2482
1903
goto end;
2483
1904
}
2489
1910
/* Create the Avahi service browser */
2490
1911
sb = avahi_s_service_browser_new(mc.server, if_index,
2491
1912
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2492
NULL, 0, browse_callback,
2493
(void *)&mc);
1913
NULL, 0, browse_callback, NULL);
2494
1914
if(sb == NULL){
2495
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2496
avahi_strerror(avahi_server_errno(mc.server)));
1915
fprintf(stderr, "Failed to create service browser: %s\n",
1916
avahi_strerror(avahi_server_errno(mc.server)));
2497
1917
exitcode = EX_UNAVAILABLE;
2498
1918
goto end;
2499
1919
}
2505
1925
/* Run the main loop */
2506
1926
2507
1927
if(debug){
2508
fprintf_plus(stderr, "Starting Avahi loop search\n");
1928
fprintf(stderr, "Starting Avahi loop search\n");
2509
1929
}
2510
2511
ret = avahi_loop_with_timeout(simple_poll,
2512
(int)(retry_interval * 1000), &mc);
1930
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
(int)(retry_interval * 1000));
2513
1933
if(debug){
2514
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2515
(ret == 0) ? "successfully" : "with error");
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
2516
1936
}
2517
1937
2518
1938
end:
2519
1939
2520
1940
if(debug){
2521
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1941
fprintf(stderr, "%s exiting\n", argv[0]);
2522
1942
}
2523
1943
2524
1944
/* Cleanup things */
2525
free(mc.interfaces);
2526
2527
1945
if(sb != NULL)
2528
1946
avahi_s_service_browser_free(sb);
2529
1947
2530
1948
if(mc.server != NULL)
2531
1949
avahi_server_free(mc.server);
2532
1950
2533
if(simple_poll != NULL)
2534
avahi_simple_poll_free(simple_poll);
1951
if(mc.simple_poll != NULL)
1952
avahi_simple_poll_free(mc.simple_poll);
2535
1953
2536
1954
if(gnutls_initialized){
2537
1955
gnutls_certificate_free_credentials(mc.cred);
2542
1960
if(gpgme_initialized){
2543
1961
gpgme_release(mc.ctx);
2544
1962
}
2545
1963
2546
1964
/* Cleans up the circular linked list of Mandos servers the client
2547
1965
has seen */
2548
1966
if(mc.current_server != NULL){
2554
1972
}
2555
1973
}
2556
1974
2557
/* Re-raise privileges */
2558
{
2559
ret_errno = raise_privileges();
2560
if(ret_errno != 0){
2561
errno = ret_errno;
2562
perror_plus("Failed to raise privileges");
2563
} else {
2564
2565
/* Run network hooks */
2566
run_network_hooks("stop", interfaces_hooks != NULL ?
2567
interfaces_hooks : "", delay);
2568
2569
/* Take down the network interfaces which were brought up */
2570
{
2571
char *interface = NULL;
2572
while((interface=argz_next(interfaces_to_take_down,
2573
interfaces_to_take_down_size,
2574
interface))){
2575
ret_errno = take_down_interface(interface);
2576
if(ret_errno != 0){
2577
errno = ret_errno;
2578
perror_plus("Failed to take down interface");
2579
}
2580
}
2581
if(debug and (interfaces_to_take_down == NULL)){
2582
fprintf_plus(stderr, "No interfaces needed to be taken"
2583
" down\n");
2584
}
2585
}
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
1978
errno = 0;
1979
ret = seteuid(0);
1980
if(ret == -1){
1981
perror_plus("seteuid");
2586
1982
}
2587
2588
ret_errno = lower_privileges_permanently();
2589
if(ret_errno != 0){
2590
errno = ret_errno;
2591
perror_plus("Failed to lower privileges permanently");
1983
if(geteuid() == 0){
1984
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1985
if(ret == -1){
1986
perror_plus("ioctl SIOCGIFFLAGS");
1987
} else if(network.ifr_flags & IFF_UP) {
1988
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1989
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1990
if(ret == -1){
1991
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1992
}
1993
}
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
if(ret == -1){
1996
perror_plus("close");
1997
}
1998
/* Lower privileges permanently */
1999
errno = 0;
2000
ret = setuid(uid);
2001
if(ret == -1){
2002
perror_plus("setuid");
2003
}
2592
2004
}
2593
2005
}
2594
2006
2595
free(interfaces_to_take_down);
2596
free(interfaces_hooks);
2597
2598
2007
/* Removes the GPGME temp directory and all files inside */
2599
if(tempdir != NULL){
2008
if(tempdir_created){
2600
2009
struct dirent **direntries = NULL;
2601
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2602
O_NOFOLLOW));
2603
if(tempdir_fd == -1){
2604
perror_plus("open");
2605
} else {
2606
#ifdef __GLIBC__
2607
#if __GLIBC_PREREQ(2, 15)
2608
int numentries = scandirat(tempdir_fd, ".", &direntries,
2609
notdotentries, alphasort);
2610
#else /* not __GLIBC_PREREQ(2, 15) */
2611
int numentries = scandir(tempdir, &direntries, notdotentries,
2612
alphasort);
2613
#endif /* not __GLIBC_PREREQ(2, 15) */
2614
#else /* not __GLIBC__ */
2615
int numentries = scandir(tempdir, &direntries, notdotentries,
2616
alphasort);
2617
#endif /* not __GLIBC__ */
2618
if(numentries >= 0){
2619
for(int i = 0; i < numentries; i++){
2620
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2621
if(ret == -1){
2622
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2623
" \"%s\", 0): %s\n", tempdir,
2624
direntries[i]->d_name, strerror(errno));
2625
}
2626
}
2627
2628
/* need to clean even if 0 because man page doesn't specify */
2629
free(direntries);
2630
if(numentries == -1){
2631
perror_plus("scandir");
2632
}
2633
ret = rmdir(tempdir);
2634
if(ret == -1 and errno != ENOENT){
2635
perror_plus("rmdir");
2636
}
2010
struct dirent *direntry = NULL;
2011
int numentries = scandir(tempdir, &direntries, notdotentries,
2012
alphasort);
2013
if (numentries > 0){
2014
for(int i = 0; i < numentries; i++){
2015
direntry = direntries[i];
2016
char *fullname = NULL;
2017
ret = asprintf(&fullname, "%s/%s", tempdir,
2018
direntry->d_name);
2019
if(ret < 0){
2020
perror_plus("asprintf");
2021
continue;
2022
}
2023
ret = remove(fullname);
2024
if(ret == -1){
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2026
strerror(errno));
2027
}
2028
free(fullname);
2637
2029
}
2638
TEMP_FAILURE_RETRY(close(tempdir_fd));
2030
}
2031
2032
/* need to clean even if 0 because man page doesn't specify */
2033
free(direntries);
2034
if (numentries == -1){
2035
perror_plus("scandir");
2036
}
2037
ret = rmdir(tempdir);
2038
if(ret == -1 and errno != ENOENT){
2039
perror_plus("rmdir");
2639
2040
}
2640
2041
}
2641
2042
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0