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- Committer: Teddy Hogeborn
- Date: 2014-08-10 14:13:02 UTC
- Revision ID: teddy@recompile.se-20140810141302-8q1xaaxlh8ho5joz
Emit D-Bus "org.freedesktop.DBus.Properties.PropertiesChanged" signal.
This deprecates the "se.recompile.Mandos.Client.PropertyChanged"
signal. The new signal also adds support for noticing changes to the
"se.recompile.Mandos.Client.Secret" write-only property.
* mandos (dbus_annotations): Fix usage example in doc string.
(DBusObjectWithProperties.PropertiesChanged): New; from D-Bus
standard.
(ClientDBus._interface): Set early instead of later.
(ClientDBus.notifychangeproperty): Take new "invalidate_only"
parameter, and pass in _interface
as a default keyword argument.
(ClientDBus.notifychangeproperty/setter): Also emit
PropertiesChanged signal;
emit new value or
invalidation depending on
"invalidate_only".
(ClientDBus.secret): Apply notifychangeproperty with
"invalidate_only=True".
(ClientDBus._foo): Removed defunct interface annotation.
(ClientDBus.PropertyChanged): Add annotation; this method is now
deprecated.
(main/MandosDBusService.GetAllClientsWithProperties): Use dictionary
comprehension.
* DBUS-API (Mandos Client Interface/Signals/PropertyChanged): Removed.
* mandos-monitor: Use standard "PropertiesChanged" signal instead of
old signal "PropertyChanged".
(MandosClientPropertyCache.__init__): Connect to signal
PropertiesChanged instead of
PropertyChanged.
(MandosClientPropertyCache._property_changed): Removed.
(MandosClientPropertyCache.property_changed): Renamed to
"properties_changed"
and adapted to new
call signature.
(MandosClientWidget.properties_changed): - '' -
This deprecates the "se.recompile.Mandos.Client.PropertyChanged"
signal. The new signal also adds support for noticing changes to the
"se.recompile.Mandos.Client.Secret" write-only property.
* mandos (dbus_annotations): Fix usage example in doc string.
(DBusObjectWithProperties.PropertiesChanged): New; from D-Bus
standard.
(ClientDBus._interface): Set early instead of later.
(ClientDBus.notifychangeproperty): Take new "invalidate_only"
parameter, and pass in _interface
as a default keyword argument.
(ClientDBus.notifychangeproperty/setter): Also emit
PropertiesChanged signal;
emit new value or
invalidation depending on
"invalidate_only".
(ClientDBus.secret): Apply notifychangeproperty with
"invalidate_only=True".
(ClientDBus._foo): Removed defunct interface annotation.
(ClientDBus.PropertyChanged): Add annotation; this method is now
deprecated.
(main/MandosDBusService.GetAllClientsWithProperties): Use dictionary
comprehension.
* DBUS-API (Mandos Client Interface/Signals/PropertyChanged): Removed.
* mandos-monitor: Use standard "PropertiesChanged" signal instead of
old signal "PropertyChanged".
(MandosClientPropertyCache.__init__): Connect to signal
PropertiesChanged instead of
PropertyChanged.
(MandosClientPropertyCache._property_changed): Removed.
(MandosClientPropertyCache.property_changed): Renamed to
"properties_changed"
and adapted to new
call signature.
(MandosClientWidget.properties_changed): - '' -
- files added:
- DBUS-API
- debian/source
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 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
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), remove() */
40
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
41
45
#include <stddef.h> /* NULL, size_t, ssize_t */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand(), strtof() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
44
48
#include <stdbool.h> /* bool, false, true */
45
49
#include <string.h> /* memset(), strcmp(), strlen(),
46
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strerror(), asprintf(), strcpy() */
49
53
sockaddr_in6, PF_INET6,
50
54
SOCK_STREAM, uid_t, gid_t, open(),
51
55
opendir(), DIR */
52
#include <sys/stat.h> /* open() */
56
#include <sys/stat.h> /* open(), S_ISREG */
53
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
inet_pton(), connect() */
55
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
56
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
57
62
*/
58
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
59
64
strtoimax() */
60
#include <assert.h> /* assert() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
63
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
64
69
SIOCSIFFLAGS, if_indextoname(),
65
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if_nametoindex(), IF_NAMESIZE */
67
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
73
*/
69
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
73
79
#include <iso646.h> /* not, or, and */
74
80
#include <argp.h> /* struct argp_option, error_t, struct
75
81
argp_state, struct argp,
76
82
argp_parse(), ARGP_KEY_ARG,
77
83
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
84
#include <signal.h> /* sigemptyset(), sigaddset(),
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
85
sigaction(), SIGTERM, sig_atomic_t,
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() */
81
98
82
99
#ifdef __linux__
83
100
#include <sys/klog.h> /* klogctl() */
101
118
init_gnutls_session(),
102
119
GNUTLS_* */
103
120
#include <gnutls/openpgp.h>
104
/* gnutls_certificate_set_openpgp_key_file(),
105
GNUTLS_OPENPGP_FMT_BASE64 */
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
106
123
107
124
/* GPGME */
108
125
#include <gpgme.h> /* All GPGME types, constants and
116
133
#define PATHDIR "/conf/conf.d/mandos"
117
134
#define SECKEY "seckey.txt"
118
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
119
137
120
138
bool debug = false;
121
139
static const char mandos_protocol_version[] = "1";
122
140
const char *argp_program_version = "mandos-client " VERSION;
123
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;
124
159
125
160
/* Used for passing in values through the Avahi callback functions */
126
161
typedef struct {
127
AvahiSimplePoll *simple_poll;
128
162
AvahiServer *server;
129
163
gnutls_certificate_credentials_t cred;
130
164
unsigned int dh_bits;
131
165
gnutls_dh_params_t dh_params;
132
166
const char *priority;
133
167
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
134
171
} mandos_context;
135
172
136
/* global context so signal handler can reach it*/
137
mandos_context mc = { .simple_poll = NULL, .server = NULL,
138
.dh_bits = 1024, .priority = "SECURE256"
139
":!CTYPE-X.509:+CTYPE-OPENPGP" };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
175
176
sig_atomic_t quit_now = 0;
177
int signal_received = 0;
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
}
140
197
141
198
/*
142
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
143
200
* bytes. "buffer_capacity" is how much is currently allocated,
144
201
* "buffer_length" is how much is already used.
145
202
*/
203
__attribute__((nonnull, warn_unused_result))
146
204
size_t incbuffer(char **buffer, size_t buffer_length,
147
size_t buffer_capacity){
205
size_t buffer_capacity){
148
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
149
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
150
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;
151
213
return 0;
152
214
}
215
*buffer = new_buf;
153
216
buffer_capacity += BUFFER_SIZE;
154
217
}
155
218
return buffer_capacity;
156
219
}
157
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
158
269
/*
159
270
* Initialize GPGME.
160
271
*/
161
static bool init_gpgme(const char *seckey,
162
const char *pubkey, const char *tempdir){
163
int ret;
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){
164
277
gpgme_error_t rc;
165
278
gpgme_engine_info_t engine_info;
166
279
167
168
280
/*
169
281
* Helper function to insert pub and seckey to the engine keyring.
170
282
*/
171
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
284
int ret;
172
285
int fd;
173
286
gpgme_data_t pgp_data;
174
287
175
288
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
176
289
if(fd == -1){
177
perror("open");
290
perror_plus("open");
178
291
return false;
179
292
}
180
293
181
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
182
295
if(rc != GPG_ERR_NO_ERROR){
183
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
184
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));
185
298
return false;
186
299
}
187
300
188
rc = gpgme_op_import(mc.ctx, pgp_data);
301
rc = gpgme_op_import(mc->ctx, pgp_data);
189
302
if(rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
192
305
return false;
193
306
}
194
307
195
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
196
309
if(ret == -1){
197
perror("close");
310
perror_plus("close");
198
311
}
199
312
gpgme_data_release(pgp_data);
200
313
return true;
201
314
}
202
315
203
316
if(debug){
204
fprintf(stderr, "Initializing GPGME\n");
317
fprintf_plus(stderr, "Initializing GPGME\n");
205
318
}
206
319
207
320
/* Init GPGME */
208
321
gpgme_check_version(NULL);
209
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
210
323
if(rc != GPG_ERR_NO_ERROR){
211
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
212
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));
213
326
return false;
214
327
}
215
328
216
/* Set GPGME home directory for the OpenPGP engine only */
329
/* Set GPGME home directory for the OpenPGP engine only */
217
330
rc = gpgme_get_engine_info(&engine_info);
218
331
if(rc != GPG_ERR_NO_ERROR){
219
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
220
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));
221
334
return false;
222
335
}
223
336
while(engine_info != NULL){
229
342
engine_info = engine_info->next;
230
343
}
231
344
if(engine_info == NULL){
232
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);
233
347
return false;
234
348
}
235
349
236
350
/* Create new GPGME "context" */
237
rc = gpgme_new(&(mc.ctx));
351
rc = gpgme_new(&(mc->ctx));
238
352
if(rc != GPG_ERR_NO_ERROR){
239
fprintf(stderr, "bad gpgme_new: %s: %s\n",
240
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));
241
356
return false;
242
357
}
243
358
245
360
return false;
246
361
}
247
362
248
return true;
363
return true;
249
364
}
250
365
251
366
/*
252
367
* Decrypt OpenPGP data.
253
368
* Returns -1 on error
254
369
*/
370
__attribute__((nonnull, warn_unused_result))
255
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
256
372
size_t crypto_size,
257
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
258
375
gpgme_data_t dh_crypto, dh_plain;
259
376
gpgme_error_t rc;
260
377
ssize_t ret;
262
379
ssize_t plaintext_length = 0;
263
380
264
381
if(debug){
265
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
266
383
}
267
384
268
385
/* Create new GPGME data buffer from memory cryptotext */
269
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
270
387
0);
271
388
if(rc != GPG_ERR_NO_ERROR){
272
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
273
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));
274
391
return -1;
275
392
}
276
393
277
394
/* Create new empty GPGME data buffer for the plaintext */
278
395
rc = gpgme_data_new(&dh_plain);
279
396
if(rc != GPG_ERR_NO_ERROR){
280
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
281
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));
282
400
gpgme_data_release(dh_crypto);
283
401
return -1;
284
402
}
285
403
286
404
/* Decrypt data from the cryptotext data buffer to the plaintext
287
405
data buffer */
288
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
289
407
if(rc != GPG_ERR_NO_ERROR){
290
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
292
410
plaintext_length = -1;
293
411
if(debug){
294
412
gpgme_decrypt_result_t result;
295
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
296
414
if(result == NULL){
297
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
298
416
} else {
299
fprintf(stderr, "Unsupported algorithm: %s\n",
300
result->unsupported_algorithm);
301
fprintf(stderr, "Wrong key usage: %u\n",
302
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);
303
421
if(result->file_name != NULL){
304
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
305
423
}
306
424
gpgme_recipient_t recipient;
307
425
recipient = result->recipients;
308
if(recipient){
309
while(recipient != NULL){
310
fprintf(stderr, "Public key algorithm: %s\n",
311
gpgme_pubkey_algo_name(recipient->pubkey_algo));
312
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
313
fprintf(stderr, "Secret key available: %s\n",
314
recipient->status == GPG_ERR_NO_SECKEY
315
? "No" : "Yes");
316
recipient = recipient->next;
317
}
426
while(recipient != NULL){
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");
434
recipient = recipient->next;
318
435
}
319
436
}
320
437
}
322
439
}
323
440
324
441
if(debug){
325
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
326
443
}
327
444
328
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
329
446
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
330
perror("gpgme_data_seek");
447
perror_plus("gpgme_data_seek");
331
448
plaintext_length = -1;
332
449
goto decrypt_end;
333
450
}
335
452
*plaintext = NULL;
336
453
while(true){
337
454
plaintext_capacity = incbuffer(plaintext,
338
(size_t)plaintext_length,
339
plaintext_capacity);
455
(size_t)plaintext_length,
456
plaintext_capacity);
340
457
if(plaintext_capacity == 0){
341
perror("incbuffer");
342
plaintext_length = -1;
343
goto decrypt_end;
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
344
461
}
345
462
346
463
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
351
468
break;
352
469
}
353
470
if(ret < 0){
354
perror("gpgme_data_read");
471
perror_plus("gpgme_data_read");
355
472
plaintext_length = -1;
356
473
goto decrypt_end;
357
474
}
359
476
}
360
477
361
478
if(debug){
362
fprintf(stderr, "Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
363
480
for(ssize_t i = 0; i < plaintext_length; i++){
364
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
365
482
}
376
493
return plaintext_length;
377
494
}
378
495
379
static const char * safer_gnutls_strerror(int value){
380
const char *ret = gnutls_strerror(value); /* Spurious warning from
381
-Wunreachable-code */
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
498
const char *ret = gnutls_strerror(value);
382
499
if(ret == NULL)
383
500
ret = "(unknown)";
384
501
return ret;
385
502
}
386
503
387
504
/* GnuTLS log function callback */
505
__attribute__((nonnull))
388
506
static void debuggnutls(__attribute__((unused)) int level,
389
507
const char* string){
390
fprintf(stderr, "GnuTLS: %s", string);
508
fprintf_plus(stderr, "GnuTLS: %s", string);
391
509
}
392
510
511
__attribute__((nonnull, warn_unused_result))
393
512
static int init_gnutls_global(const char *pubkeyfilename,
394
const char *seckeyfilename){
513
const char *seckeyfilename,
514
mandos_context *mc){
395
515
int ret;
396
516
397
517
if(debug){
398
fprintf(stderr, "Initializing GnuTLS\n");
518
fprintf_plus(stderr, "Initializing GnuTLS\n");
399
519
}
400
520
401
521
ret = gnutls_global_init();
402
522
if(ret != GNUTLS_E_SUCCESS){
403
fprintf(stderr, "GnuTLS global_init: %s\n",
404
safer_gnutls_strerror(ret));
523
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
524
safer_gnutls_strerror(ret));
405
525
return -1;
406
526
}
407
527
414
534
}
415
535
416
536
/* OpenPGP credentials */
417
gnutls_certificate_allocate_credentials(&mc.cred);
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
418
538
if(ret != GNUTLS_E_SUCCESS){
419
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
from
421
-Wunreachable-code
422
*/
423
safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
424
541
gnutls_global_deinit();
425
542
return -1;
426
543
}
427
544
428
545
if(debug){
429
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
430
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
431
seckeyfilename);
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
548
pubkeyfilename,
549
seckeyfilename);
432
550
}
433
551
434
552
ret = gnutls_certificate_set_openpgp_key_file
435
(mc.cred, pubkeyfilename, seckeyfilename,
553
(mc->cred, pubkeyfilename, seckeyfilename,
436
554
GNUTLS_OPENPGP_FMT_BASE64);
437
555
if(ret != GNUTLS_E_SUCCESS){
438
fprintf(stderr,
439
"Error[%d] while reading the OpenPGP key pair ('%s',"
440
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
441
fprintf(stderr, "The GnuTLS error is: %s\n",
442
safer_gnutls_strerror(ret));
556
fprintf_plus(stderr,
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
558
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
559
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
safer_gnutls_strerror(ret));
443
561
goto globalfail;
444
562
}
445
563
446
564
/* GnuTLS server initialization */
447
ret = gnutls_dh_params_init(&mc.dh_params);
565
ret = gnutls_dh_params_init(&mc->dh_params);
448
566
if(ret != GNUTLS_E_SUCCESS){
449
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
450
" %s\n", safer_gnutls_strerror(ret));
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
451
570
goto globalfail;
452
571
}
453
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
454
573
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
456
safer_gnutls_strerror(ret));
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
457
576
goto globalfail;
458
577
}
459
578
460
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
461
580
462
581
return 0;
463
582
464
583
globalfail:
465
584
466
gnutls_certificate_free_credentials(mc.cred);
585
gnutls_certificate_free_credentials(mc->cred);
467
586
gnutls_global_deinit();
468
gnutls_dh_params_deinit(mc.dh_params);
587
gnutls_dh_params_deinit(mc->dh_params);
469
588
return -1;
470
589
}
471
590
472
static int init_gnutls_session(gnutls_session_t *session){
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
593
mandos_context *mc){
473
594
int ret;
474
595
/* GnuTLS session creation */
475
ret = gnutls_init(session, GNUTLS_SERVER);
596
do {
597
ret = gnutls_init(session, GNUTLS_SERVER);
598
if(quit_now){
599
return -1;
600
}
601
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
476
602
if(ret != GNUTLS_E_SUCCESS){
477
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
478
safer_gnutls_strerror(ret));
603
fprintf_plus(stderr,
604
"Error in GnuTLS session initialization: %s\n",
605
safer_gnutls_strerror(ret));
479
606
}
480
607
481
608
{
482
609
const char *err;
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
610
do {
611
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
612
if(quit_now){
613
gnutls_deinit(*session);
614
return -1;
615
}
616
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
484
617
if(ret != GNUTLS_E_SUCCESS){
485
fprintf(stderr, "Syntax error at: %s\n", err);
486
fprintf(stderr, "GnuTLS error: %s\n",
487
safer_gnutls_strerror(ret));
618
fprintf_plus(stderr, "Syntax error at: %s\n", err);
619
fprintf_plus(stderr, "GnuTLS error: %s\n",
620
safer_gnutls_strerror(ret));
488
621
gnutls_deinit(*session);
489
622
return -1;
490
623
}
491
624
}
492
625
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
494
mc.cred);
626
do {
627
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
628
mc->cred);
629
if(quit_now){
630
gnutls_deinit(*session);
631
return -1;
632
}
633
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
495
634
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
497
safer_gnutls_strerror(ret));
635
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
636
safer_gnutls_strerror(ret));
498
637
gnutls_deinit(*session);
499
638
return -1;
500
639
}
501
640
502
641
/* ignore client certificate if any. */
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
642
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
643
506
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
644
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
507
645
508
646
return 0;
509
647
}
513
651
__attribute__((unused)) const char *txt){}
514
652
515
653
/* Called when a Mandos server is found */
516
static int start_mandos_communication(const char *ip, uint16_t port,
654
__attribute__((nonnull, warn_unused_result))
655
static int start_mandos_communication(const char *ip, in_port_t port,
517
656
AvahiIfIndex if_index,
518
int af){
519
int ret, tcp_sd;
657
int af, mandos_context *mc){
658
int ret, tcp_sd = -1;
520
659
ssize_t sret;
521
union {
522
struct sockaddr_in in;
523
struct sockaddr_in6 in6;
524
} to;
660
struct sockaddr_storage to;
525
661
char *buffer = NULL;
526
char *decrypted_buffer;
662
char *decrypted_buffer = NULL;
527
663
size_t buffer_length = 0;
528
664
size_t buffer_capacity = 0;
529
ssize_t decrypted_buffer_size;
530
665
size_t written;
531
int retval = 0;
666
int retval = -1;
532
667
gnutls_session_t session;
533
668
int pf; /* Protocol family */
534
669
670
errno = 0;
671
672
if(quit_now){
673
errno = EINTR;
674
return -1;
675
}
676
535
677
switch(af){
536
678
case AF_INET6:
537
679
pf = PF_INET6;
540
682
pf = PF_INET;
541
683
break;
542
684
default:
543
fprintf(stderr, "Bad address family: %d\n", af);
685
fprintf_plus(stderr, "Bad address family: %d\n", af);
686
errno = EINVAL;
544
687
return -1;
545
688
}
546
689
547
ret = init_gnutls_session(&session);
690
/* If the interface is specified and we have a list of interfaces */
691
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
692
/* Check if the interface is one of the interfaces we are using */
693
bool match = false;
694
{
695
char *interface = NULL;
696
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
697
interface))){
698
if(if_nametoindex(interface) == (unsigned int)if_index){
699
match = true;
700
break;
701
}
702
}
703
}
704
if(not match){
705
/* This interface does not match any in the list, so we don't
706
connect to the server */
707
if(debug){
708
char interface[IF_NAMESIZE];
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
711
} else {
712
fprintf_plus(stderr, "Skipping server on non-used interface"
713
" \"%s\"\n",
714
if_indextoname((unsigned int)if_index,
715
interface));
716
}
717
}
718
return -1;
719
}
720
}
721
722
ret = init_gnutls_session(&session, mc);
548
723
if(ret != 0){
549
724
return -1;
550
725
}
551
726
552
727
if(debug){
553
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
554
"\n", ip, port);
728
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
729
PRIuMAX "\n", ip, (uintmax_t)port);
555
730
}
556
731
557
732
tcp_sd = socket(pf, SOCK_STREAM, 0);
558
733
if(tcp_sd < 0){
559
perror("socket");
560
return -1;
734
int e = errno;
735
perror_plus("socket");
736
errno = e;
737
goto mandos_end;
738
}
739
740
if(quit_now){
741
errno = EINTR;
742
goto mandos_end;
561
743
}
562
744
563
745
memset(&to, 0, sizeof(to));
564
746
if(af == AF_INET6){
565
to.in6.sin6_family = (uint16_t)af;
566
ret = inet_pton(af, ip, &to.in6.sin6_addr);
747
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
748
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
567
749
} else { /* IPv4 */
568
to.in.sin_family = (sa_family_t)af;
569
ret = inet_pton(af, ip, &to.in.sin_addr);
750
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
751
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
570
752
}
571
753
if(ret < 0 ){
572
perror("inet_pton");
573
return -1;
754
int e = errno;
755
perror_plus("inet_pton");
756
errno = e;
757
goto mandos_end;
574
758
}
575
759
if(ret == 0){
576
fprintf(stderr, "Bad address: %s\n", ip);
577
return -1;
760
int e = errno;
761
fprintf_plus(stderr, "Bad address: %s\n", ip);
762
errno = e;
763
goto mandos_end;
578
764
}
579
765
if(af == AF_INET6){
580
to.in6.sin6_port = htons(port); /* Spurious warnings from
581
-Wconversion and
582
-Wunreachable-code */
583
584
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
585
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
586
-Wunreachable-code*/
766
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
767
if(IN6_IS_ADDR_LINKLOCAL
768
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
587
769
if(if_index == AVAHI_IF_UNSPEC){
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
589
" without a network interface\n");
590
return -1;
770
fprintf_plus(stderr, "An IPv6 link-local address is"
771
" incomplete without a network interface\n");
772
errno = EINVAL;
773
goto mandos_end;
591
774
}
592
775
/* Set the network interface number as scope */
593
to.in6.sin6_scope_id = (uint32_t)if_index;
776
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
594
777
}
595
778
} else {
596
to.in.sin_port = htons(port); /* Spurious warnings from
597
-Wconversion and
598
-Wunreachable-code */
779
((struct sockaddr_in *)&to)->sin_port = htons(port);
780
}
781
782
if(quit_now){
783
errno = EINTR;
784
goto mandos_end;
599
785
}
600
786
601
787
if(debug){
602
788
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
603
789
char interface[IF_NAMESIZE];
604
790
if(if_indextoname((unsigned int)if_index, interface) == NULL){
605
perror("if_indextoname");
791
perror_plus("if_indextoname");
606
792
} else {
607
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
608
ip, interface, port);
793
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
794
"\n", ip, interface, (uintmax_t)port);
609
795
}
610
796
} else {
611
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
612
port);
797
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
798
ip, (uintmax_t)port);
613
799
}
614
800
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
615
801
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
616
const char *pcret;
617
802
if(af == AF_INET6){
618
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
619
sizeof(addrstr));
620
} else {
621
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
622
sizeof(addrstr));
623
}
624
if(pcret == NULL){
625
perror("inet_ntop");
626
} else {
627
if(strcmp(addrstr, ip) != 0){
628
fprintf(stderr, "Canonical address form: %s\n", addrstr);
629
}
630
}
803
ret = getnameinfo((struct sockaddr *)&to,
804
sizeof(struct sockaddr_in6),
805
addrstr, sizeof(addrstr), NULL, 0,
806
NI_NUMERICHOST);
807
} else {
808
ret = getnameinfo((struct sockaddr *)&to,
809
sizeof(struct sockaddr_in),
810
addrstr, sizeof(addrstr), NULL, 0,
811
NI_NUMERICHOST);
812
}
813
if(ret == EAI_SYSTEM){
814
perror_plus("getnameinfo");
815
} else if(ret != 0) {
816
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
817
} else if(strcmp(addrstr, ip) != 0){
818
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
819
}
820
}
821
822
if(quit_now){
823
errno = EINTR;
824
goto mandos_end;
631
825
}
632
826
633
827
if(af == AF_INET6){
634
ret = connect(tcp_sd, &to.in6, sizeof(to));
828
ret = connect(tcp_sd, (struct sockaddr *)&to,
829
sizeof(struct sockaddr_in6));
635
830
} else {
636
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
831
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
832
sizeof(struct sockaddr_in));
637
833
}
638
834
if(ret < 0){
639
perror("connect");
640
return -1;
835
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
836
int e = errno;
837
perror_plus("connect");
838
errno = e;
839
}
840
goto mandos_end;
841
}
842
843
if(quit_now){
844
errno = EINTR;
845
goto mandos_end;
641
846
}
642
847
643
848
const char *out = mandos_protocol_version;
645
850
while(true){
646
851
size_t out_size = strlen(out);
647
852
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
648
out_size - written));
853
out_size - written));
649
854
if(ret == -1){
650
perror("write");
651
retval = -1;
855
int e = errno;
856
perror_plus("write");
857
errno = e;
652
858
goto mandos_end;
653
859
}
654
860
written += (size_t)ret;
662
868
break;
663
869
}
664
870
}
871
872
if(quit_now){
873
errno = EINTR;
874
goto mandos_end;
875
}
665
876
}
666
877
667
878
if(debug){
668
fprintf(stderr, "Establishing TLS session with %s\n", ip);
669
}
670
671
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
672
673
do{
879
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
880
}
881
882
if(quit_now){
883
errno = EINTR;
884
goto mandos_end;
885
}
886
887
/* This casting via intptr_t is to eliminate warning about casting
888
an int to a pointer type. This is exactly how the GnuTLS Guile
889
function "set-session-transport-fd!" does it. */
890
gnutls_transport_set_ptr(session,
891
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
892
893
if(quit_now){
894
errno = EINTR;
895
goto mandos_end;
896
}
897
898
do {
674
899
ret = gnutls_handshake(session);
900
if(quit_now){
901
errno = EINTR;
902
goto mandos_end;
903
}
675
904
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
676
905
677
906
if(ret != GNUTLS_E_SUCCESS){
678
907
if(debug){
679
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
908
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
680
909
gnutls_perror(ret);
681
910
}
682
retval = -1;
911
errno = EPROTO;
683
912
goto mandos_end;
684
913
}
685
914
686
915
/* Read OpenPGP packet that contains the wanted password */
687
916
688
917
if(debug){
689
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
690
ip);
918
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
919
" %s\n", ip);
691
920
}
692
921
693
922
while(true){
923
924
if(quit_now){
925
errno = EINTR;
926
goto mandos_end;
927
}
928
694
929
buffer_capacity = incbuffer(&buffer, buffer_length,
695
buffer_capacity);
930
buffer_capacity);
696
931
if(buffer_capacity == 0){
697
perror("incbuffer");
698
retval = -1;
932
int e = errno;
933
perror_plus("incbuffer");
934
errno = e;
935
goto mandos_end;
936
}
937
938
if(quit_now){
939
errno = EINTR;
699
940
goto mandos_end;
700
941
}
701
942
710
951
case GNUTLS_E_AGAIN:
711
952
break;
712
953
case GNUTLS_E_REHANDSHAKE:
713
do{
954
do {
714
955
ret = gnutls_handshake(session);
956
957
if(quit_now){
958
errno = EINTR;
959
goto mandos_end;
960
}
715
961
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
716
962
if(ret < 0){
717
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
963
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
964
"***\n");
718
965
gnutls_perror(ret);
719
retval = -1;
966
errno = EPROTO;
720
967
goto mandos_end;
721
968
}
722
969
break;
723
970
default:
724
fprintf(stderr, "Unknown error while reading data from"
725
" encrypted session with Mandos server\n");
726
retval = -1;
971
fprintf_plus(stderr, "Unknown error while reading data from"
972
" encrypted session with Mandos server\n");
727
973
gnutls_bye(session, GNUTLS_SHUT_RDWR);
974
errno = EIO;
728
975
goto mandos_end;
729
976
}
730
977
} else {
733
980
}
734
981
735
982
if(debug){
736
fprintf(stderr, "Closing TLS session\n");
737
}
738
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
983
fprintf_plus(stderr, "Closing TLS session\n");
984
}
985
986
if(quit_now){
987
errno = EINTR;
988
goto mandos_end;
989
}
990
991
do {
992
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
993
if(quit_now){
994
errno = EINTR;
995
goto mandos_end;
996
}
997
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
740
998
741
999
if(buffer_length > 0){
742
decrypted_buffer_size = pgp_packet_decrypt(buffer,
743
buffer_length,
744
&decrypted_buffer);
1000
ssize_t decrypted_buffer_size;
1001
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1002
&decrypted_buffer, mc);
745
1003
if(decrypted_buffer_size >= 0){
1004
746
1005
written = 0;
747
1006
while(written < (size_t) decrypted_buffer_size){
1007
if(quit_now){
1008
errno = EINTR;
1009
goto mandos_end;
1010
}
1011
748
1012
ret = (int)fwrite(decrypted_buffer + written, 1,
749
1013
(size_t)decrypted_buffer_size - written,
750
1014
stdout);
751
1015
if(ret == 0 and ferror(stdout)){
1016
int e = errno;
752
1017
if(debug){
753
fprintf(stderr, "Error writing encrypted data: %s\n",
754
strerror(errno));
1018
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1019
strerror(errno));
755
1020
}
756
retval = -1;
757
break;
1021
errno = e;
1022
goto mandos_end;
758
1023
}
759
1024
written += (size_t)ret;
760
1025
}
761
free(decrypted_buffer);
762
} else {
763
retval = -1;
1026
retval = 0;
764
1027
}
765
} else {
766
retval = -1;
767
1028
}
768
1029
769
1030
/* Shutdown procedure */
770
1031
771
1032
mandos_end:
772
free(buffer);
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
774
if(ret == -1){
775
perror("close");
1033
{
1034
int e = errno;
1035
free(decrypted_buffer);
1036
free(buffer);
1037
if(tcp_sd >= 0){
1038
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1039
}
1040
if(ret == -1){
1041
if(e == 0){
1042
e = errno;
1043
}
1044
perror_plus("close");
1045
}
1046
gnutls_deinit(session);
1047
errno = e;
1048
if(quit_now){
1049
errno = EINTR;
1050
retval = -1;
1051
}
776
1052
}
777
gnutls_deinit(session);
778
1053
return retval;
779
1054
}
780
1055
1056
__attribute__((nonnull))
781
1057
static void resolve_callback(AvahiSServiceResolver *r,
782
1058
AvahiIfIndex interface,
783
1059
AvahiProtocol proto,
791
1067
AVAHI_GCC_UNUSED AvahiStringList *txt,
792
1068
AVAHI_GCC_UNUSED AvahiLookupResultFlags
793
1069
flags,
794
AVAHI_GCC_UNUSED void* userdata){
795
assert(r);
1070
void *mc){
1071
if(r == NULL){
1072
return;
1073
}
796
1074
797
1075
/* Called whenever a service has been resolved successfully or
798
1076
timed out */
799
1077
1078
if(quit_now){
1079
avahi_s_service_resolver_free(r);
1080
return;
1081
}
1082
800
1083
switch(event){
801
1084
default:
802
1085
case AVAHI_RESOLVER_FAILURE:
803
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
804
" of type '%s' in domain '%s': %s\n", name, type, domain,
805
avahi_strerror(avahi_server_errno(mc.server)));
1086
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1087
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1088
domain,
1089
avahi_strerror(avahi_server_errno
1090
(((mandos_context*)mc)->server)));
806
1091
break;
807
1092
808
1093
case AVAHI_RESOLVER_FOUND:
810
1095
char ip[AVAHI_ADDRESS_STR_MAX];
811
1096
avahi_address_snprint(ip, sizeof(ip), address);
812
1097
if(debug){
813
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
814
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
815
ip, (intmax_t)interface, port);
1098
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1099
PRIdMAX ") on port %" PRIu16 "\n", name,
1100
host_name, ip, (intmax_t)interface, port);
816
1101
}
817
int ret = start_mandos_communication(ip, port, interface,
818
avahi_proto_to_af(proto));
1102
int ret = start_mandos_communication(ip, (in_port_t)port,
1103
interface,
1104
avahi_proto_to_af(proto),
1105
mc);
819
1106
if(ret == 0){
820
avahi_simple_poll_quit(mc.simple_poll);
1107
avahi_simple_poll_quit(simple_poll);
1108
} else {
1109
if(not add_server(ip, (in_port_t)port, interface,
1110
avahi_proto_to_af(proto),
1111
&((mandos_context*)mc)->current_server)){
1112
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1113
" list\n", name);
1114
}
821
1115
}
822
1116
}
823
1117
}
833
1127
const char *domain,
834
1128
AVAHI_GCC_UNUSED AvahiLookupResultFlags
835
1129
flags,
836
AVAHI_GCC_UNUSED void* userdata){
837
assert(b);
1130
void *mc){
1131
if(b == NULL){
1132
return;
1133
}
838
1134
839
1135
/* Called whenever a new services becomes available on the LAN or
840
1136
is removed from the LAN */
841
1137
1138
if(quit_now){
1139
return;
1140
}
1141
842
1142
switch(event){
843
1143
default:
844
1144
case AVAHI_BROWSER_FAILURE:
845
1145
846
fprintf(stderr, "(Avahi browser) %s\n",
847
avahi_strerror(avahi_server_errno(mc.server)));
848
avahi_simple_poll_quit(mc.simple_poll);
1146
fprintf_plus(stderr, "(Avahi browser) %s\n",
1147
avahi_strerror(avahi_server_errno
1148
(((mandos_context*)mc)->server)));
1149
avahi_simple_poll_quit(simple_poll);
849
1150
return;
850
1151
851
1152
case AVAHI_BROWSER_NEW:
854
1155
the callback function is called the Avahi server will free the
855
1156
resolver for us. */
856
1157
857
if(!(avahi_s_service_resolver_new(mc.server, interface,
858
protocol, name, type, domain,
859
AVAHI_PROTO_INET6, 0,
860
resolve_callback, NULL)))
861
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
862
name, avahi_strerror(avahi_server_errno(mc.server)));
1158
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1159
interface, protocol, name, type,
1160
domain, protocol, 0,
1161
resolve_callback, mc) == NULL)
1162
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1163
" %s\n", name,
1164
avahi_strerror(avahi_server_errno
1165
(((mandos_context*)mc)->server)));
863
1166
break;
864
1167
865
1168
case AVAHI_BROWSER_REMOVE:
868
1171
case AVAHI_BROWSER_ALL_FOR_NOW:
869
1172
case AVAHI_BROWSER_CACHE_EXHAUSTED:
870
1173
if(debug){
871
fprintf(stderr, "No Mandos server found, still searching...\n");
1174
fprintf_plus(stderr, "No Mandos server found, still"
1175
" searching...\n");
872
1176
}
873
1177
break;
874
1178
}
875
1179
}
876
1180
877
sig_atomic_t quit_now = 0;
878
879
/* stop main loop after sigterm has been called */
880
static void handle_sigterm(__attribute__((unused)) int sig){
1181
/* Signal handler that stops main loop after SIGTERM */
1182
static void handle_sigterm(int sig){
881
1183
if(quit_now){
882
1184
return;
883
1185
}
884
1186
quit_now = 1;
1187
signal_received = sig;
885
1188
int old_errno = errno;
886
if(mc.simple_poll != NULL){
887
avahi_simple_poll_quit(mc.simple_poll);
888
}
889
errno = old_errno;
1189
/* set main loop to exit */
1190
if(simple_poll != NULL){
1191
avahi_simple_poll_quit(simple_poll);
1192
}
1193
errno = old_errno;
1194
}
1195
1196
__attribute__((nonnull, warn_unused_result))
1197
bool get_flags(const char *ifname, struct ifreq *ifr){
1198
int ret;
1199
error_t ret_errno;
1200
1201
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1202
if(s < 0){
1203
ret_errno = errno;
1204
perror_plus("socket");
1205
errno = ret_errno;
1206
return false;
1207
}
1208
strcpy(ifr->ifr_name, ifname);
1209
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1210
if(ret == -1){
1211
if(debug){
1212
ret_errno = errno;
1213
perror_plus("ioctl SIOCGIFFLAGS");
1214
errno = ret_errno;
1215
}
1216
return false;
1217
}
1218
return true;
1219
}
1220
1221
__attribute__((nonnull, warn_unused_result))
1222
bool good_flags(const char *ifname, const struct ifreq *ifr){
1223
1224
/* Reject the loopback device */
1225
if(ifr->ifr_flags & IFF_LOOPBACK){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1228
ifname);
1229
}
1230
return false;
1231
}
1232
/* Accept point-to-point devices only if connect_to is specified */
1233
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1234
if(debug){
1235
fprintf_plus(stderr, "Accepting point-to-point interface"
1236
" \"%s\"\n", ifname);
1237
}
1238
return true;
1239
}
1240
/* Otherwise, reject non-broadcast-capable devices */
1241
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1242
if(debug){
1243
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1244
" \"%s\"\n", ifname);
1245
}
1246
return false;
1247
}
1248
/* Reject non-ARP interfaces (including dummy interfaces) */
1249
if(ifr->ifr_flags & IFF_NOARP){
1250
if(debug){
1251
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1252
ifname);
1253
}
1254
return false;
1255
}
1256
1257
/* Accept this device */
1258
if(debug){
1259
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1260
}
1261
return true;
1262
}
1263
1264
/*
1265
* This function determines if a directory entry in /sys/class/net
1266
* corresponds to an acceptable network device.
1267
* (This function is passed to scandir(3) as a filter function.)
1268
*/
1269
__attribute__((nonnull, warn_unused_result))
1270
int good_interface(const struct dirent *if_entry){
1271
if(if_entry->d_name[0] == '.'){
1272
return 0;
1273
}
1274
1275
struct ifreq ifr;
1276
if(not get_flags(if_entry->d_name, &ifr)){
1277
if(debug){
1278
fprintf_plus(stderr, "Failed to get flags for interface "
1279
"\"%s\"\n", if_entry->d_name);
1280
}
1281
return 0;
1282
}
1283
1284
if(not good_flags(if_entry->d_name, &ifr)){
1285
return 0;
1286
}
1287
return 1;
1288
}
1289
1290
/*
1291
* This function determines if a network interface is up.
1292
*/
1293
__attribute__((nonnull, warn_unused_result))
1294
bool interface_is_up(const char *interface){
1295
struct ifreq ifr;
1296
if(not get_flags(interface, &ifr)){
1297
if(debug){
1298
fprintf_plus(stderr, "Failed to get flags for interface "
1299
"\"%s\"\n", interface);
1300
}
1301
return false;
1302
}
1303
1304
return (bool)(ifr.ifr_flags & IFF_UP);
1305
}
1306
1307
/*
1308
* This function determines if a network interface is running
1309
*/
1310
__attribute__((nonnull, warn_unused_result))
1311
bool interface_is_running(const char *interface){
1312
struct ifreq ifr;
1313
if(not get_flags(interface, &ifr)){
1314
if(debug){
1315
fprintf_plus(stderr, "Failed to get flags for interface "
1316
"\"%s\"\n", interface);
1317
}
1318
return false;
1319
}
1320
1321
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1322
}
1323
1324
__attribute__((nonnull, pure, warn_unused_result))
1325
int notdotentries(const struct dirent *direntry){
1326
/* Skip "." and ".." */
1327
if(direntry->d_name[0] == '.'
1328
and (direntry->d_name[1] == '\0'
1329
or (direntry->d_name[1] == '.'
1330
and direntry->d_name[2] == '\0'))){
1331
return 0;
1332
}
1333
return 1;
1334
}
1335
1336
/* Is this directory entry a runnable program? */
1337
__attribute__((nonnull, warn_unused_result))
1338
int runnable_hook(const struct dirent *direntry){
1339
int ret;
1340
size_t sret;
1341
struct stat st;
1342
1343
if((direntry->d_name)[0] == '\0'){
1344
/* Empty name? */
1345
return 0;
1346
}
1347
1348
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1349
"abcdefghijklmnopqrstuvwxyz"
1350
"0123456789"
1351
"_.-");
1352
if((direntry->d_name)[sret] != '\0'){
1353
/* Contains non-allowed characters */
1354
if(debug){
1355
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1356
direntry->d_name);
1357
}
1358
return 0;
1359
}
1360
1361
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1362
if(ret == -1){
1363
if(debug){
1364
perror_plus("Could not stat hook");
1365
}
1366
return 0;
1367
}
1368
if(not (S_ISREG(st.st_mode))){
1369
/* Not a regular file */
1370
if(debug){
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1372
direntry->d_name);
1373
}
1374
return 0;
1375
}
1376
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1377
/* Not executable */
1378
if(debug){
1379
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1380
direntry->d_name);
1381
}
1382
return 0;
1383
}
1384
if(debug){
1385
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1386
direntry->d_name);
1387
}
1388
return 1;
1389
}
1390
1391
__attribute__((nonnull, warn_unused_result))
1392
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1393
mandos_context *mc){
1394
int ret;
1395
struct timespec now;
1396
struct timespec waited_time;
1397
intmax_t block_time;
1398
1399
while(true){
1400
if(mc->current_server == NULL){
1401
if(debug){
1402
fprintf_plus(stderr, "Wait until first server is found."
1403
" No timeout!\n");
1404
}
1405
ret = avahi_simple_poll_iterate(s, -1);
1406
} else {
1407
if(debug){
1408
fprintf_plus(stderr, "Check current_server if we should run"
1409
" it, or wait\n");
1410
}
1411
/* the current time */
1412
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1413
if(ret == -1){
1414
perror_plus("clock_gettime");
1415
return -1;
1416
}
1417
/* Calculating in ms how long time between now and server
1418
who we visted longest time ago. Now - last seen. */
1419
waited_time.tv_sec = (now.tv_sec
1420
- mc->current_server->last_seen.tv_sec);
1421
waited_time.tv_nsec = (now.tv_nsec
1422
- mc->current_server->last_seen.tv_nsec);
1423
/* total time is 10s/10,000ms.
1424
Converting to s from ms by dividing by 1,000,
1425
and ns to ms by dividing by 1,000,000. */
1426
block_time = ((retry_interval
1427
- ((intmax_t)waited_time.tv_sec * 1000))
1428
- ((intmax_t)waited_time.tv_nsec / 1000000));
1429
1430
if(debug){
1431
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1432
block_time);
1433
}
1434
1435
if(block_time <= 0){
1436
ret = start_mandos_communication(mc->current_server->ip,
1437
mc->current_server->port,
1438
mc->current_server->if_index,
1439
mc->current_server->af, mc);
1440
if(ret == 0){
1441
avahi_simple_poll_quit(s);
1442
return 0;
1443
}
1444
ret = clock_gettime(CLOCK_MONOTONIC,
1445
&mc->current_server->last_seen);
1446
if(ret == -1){
1447
perror_plus("clock_gettime");
1448
return -1;
1449
}
1450
mc->current_server = mc->current_server->next;
1451
block_time = 0; /* Call avahi to find new Mandos
1452
servers, but don't block */
1453
}
1454
1455
ret = avahi_simple_poll_iterate(s, (int)block_time);
1456
}
1457
if(ret != 0){
1458
if(ret > 0 or errno != EINTR){
1459
return (ret != 1) ? ret : 0;
1460
}
1461
}
1462
}
1463
}
1464
1465
/* Set effective uid to 0, return errno */
1466
__attribute__((warn_unused_result))
1467
error_t raise_privileges(void){
1468
error_t old_errno = errno;
1469
error_t ret_errno = 0;
1470
if(seteuid(0) == -1){
1471
ret_errno = errno;
1472
}
1473
errno = old_errno;
1474
return ret_errno;
1475
}
1476
1477
/* Set effective and real user ID to 0. Return errno. */
1478
__attribute__((warn_unused_result))
1479
error_t raise_privileges_permanently(void){
1480
error_t old_errno = errno;
1481
error_t ret_errno = raise_privileges();
1482
if(ret_errno != 0){
1483
errno = old_errno;
1484
return ret_errno;
1485
}
1486
if(setuid(0) == -1){
1487
ret_errno = errno;
1488
}
1489
errno = old_errno;
1490
return ret_errno;
1491
}
1492
1493
/* Set effective user ID to unprivileged saved user ID */
1494
__attribute__((warn_unused_result))
1495
error_t lower_privileges(void){
1496
error_t old_errno = errno;
1497
error_t ret_errno = 0;
1498
if(seteuid(uid) == -1){
1499
ret_errno = errno;
1500
}
1501
errno = old_errno;
1502
return ret_errno;
1503
}
1504
1505
/* Lower privileges permanently */
1506
__attribute__((warn_unused_result))
1507
error_t lower_privileges_permanently(void){
1508
error_t old_errno = errno;
1509
error_t ret_errno = 0;
1510
if(setuid(uid) == -1){
1511
ret_errno = errno;
1512
}
1513
errno = old_errno;
1514
return ret_errno;
1515
}
1516
1517
__attribute__((nonnull))
1518
void run_network_hooks(const char *mode, const char *interface,
1519
const float delay){
1520
struct dirent **direntries = NULL;
1521
if(hookdir_fd == -1){
1522
hookdir_fd = open(hookdir, O_RDONLY);
1523
if(hookdir_fd == -1){
1524
if(errno == ENOENT){
1525
if(debug){
1526
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1527
" found\n", hookdir);
1528
}
1529
} else {
1530
perror_plus("open");
1531
}
1532
return;
1533
}
1534
}
1535
#ifdef __GLIBC__
1536
#if __GLIBC_PREREQ(2, 15)
1537
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1538
runnable_hook, alphasort);
1539
#else /* not __GLIBC_PREREQ(2, 15) */
1540
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1541
alphasort);
1542
#endif /* not __GLIBC_PREREQ(2, 15) */
1543
#else /* not __GLIBC__ */
1544
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1545
alphasort);
1546
#endif /* not __GLIBC__ */
1547
if(numhooks == -1){
1548
perror_plus("scandir");
1549
return;
1550
}
1551
struct dirent *direntry;
1552
int ret;
1553
int devnull = open("/dev/null", O_RDONLY);
1554
for(int i = 0; i < numhooks; i++){
1555
direntry = direntries[i];
1556
if(debug){
1557
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1558
direntry->d_name);
1559
}
1560
pid_t hook_pid = fork();
1561
if(hook_pid == 0){
1562
/* Child */
1563
/* Raise privileges */
1564
errno = raise_privileges_permanently();
1565
if(errno != 0){
1566
perror_plus("Failed to raise privileges");
1567
_exit(EX_NOPERM);
1568
}
1569
/* Set group */
1570
errno = 0;
1571
ret = setgid(0);
1572
if(ret == -1){
1573
perror_plus("setgid");
1574
_exit(EX_NOPERM);
1575
}
1576
/* Reset supplementary groups */
1577
errno = 0;
1578
ret = setgroups(0, NULL);
1579
if(ret == -1){
1580
perror_plus("setgroups");
1581
_exit(EX_NOPERM);
1582
}
1583
ret = dup2(devnull, STDIN_FILENO);
1584
if(ret == -1){
1585
perror_plus("dup2(devnull, STDIN_FILENO)");
1586
_exit(EX_OSERR);
1587
}
1588
ret = close(devnull);
1589
if(ret == -1){
1590
perror_plus("close");
1591
_exit(EX_OSERR);
1592
}
1593
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1594
if(ret == -1){
1595
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1596
_exit(EX_OSERR);
1597
}
1598
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1599
if(ret == -1){
1600
perror_plus("setenv");
1601
_exit(EX_OSERR);
1602
}
1603
ret = setenv("DEVICE", interface, 1);
1604
if(ret == -1){
1605
perror_plus("setenv");
1606
_exit(EX_OSERR);
1607
}
1608
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1609
if(ret == -1){
1610
perror_plus("setenv");
1611
_exit(EX_OSERR);
1612
}
1613
ret = setenv("MODE", mode, 1);
1614
if(ret == -1){
1615
perror_plus("setenv");
1616
_exit(EX_OSERR);
1617
}
1618
char *delaystring;
1619
ret = asprintf(&delaystring, "%f", (double)delay);
1620
if(ret == -1){
1621
perror_plus("asprintf");
1622
_exit(EX_OSERR);
1623
}
1624
ret = setenv("DELAY", delaystring, 1);
1625
if(ret == -1){
1626
free(delaystring);
1627
perror_plus("setenv");
1628
_exit(EX_OSERR);
1629
}
1630
free(delaystring);
1631
if(connect_to != NULL){
1632
ret = setenv("CONNECT", connect_to, 1);
1633
if(ret == -1){
1634
perror_plus("setenv");
1635
_exit(EX_OSERR);
1636
}
1637
}
1638
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1639
if(hook_fd == -1){
1640
perror_plus("openat");
1641
_exit(EXIT_FAILURE);
1642
}
1643
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1644
perror_plus("close");
1645
_exit(EXIT_FAILURE);
1646
}
1647
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1648
environ) == -1){
1649
perror_plus("fexecve");
1650
_exit(EXIT_FAILURE);
1651
}
1652
} else {
1653
int status;
1654
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1655
perror_plus("waitpid");
1656
free(direntry);
1657
continue;
1658
}
1659
if(WIFEXITED(status)){
1660
if(WEXITSTATUS(status) != 0){
1661
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1662
" with status %d\n", direntry->d_name,
1663
WEXITSTATUS(status));
1664
free(direntry);
1665
continue;
1666
}
1667
} else if(WIFSIGNALED(status)){
1668
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1669
" signal %d\n", direntry->d_name,
1670
WTERMSIG(status));
1671
free(direntry);
1672
continue;
1673
} else {
1674
fprintf_plus(stderr, "Warning: network hook \"%s\""
1675
" crashed\n", direntry->d_name);
1676
free(direntry);
1677
continue;
1678
}
1679
}
1680
if(debug){
1681
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1682
direntry->d_name);
1683
}
1684
free(direntry);
1685
}
1686
free(direntries);
1687
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1688
perror_plus("close");
1689
} else {
1690
hookdir_fd = -1;
1691
}
1692
close(devnull);
1693
}
1694
1695
__attribute__((nonnull, warn_unused_result))
1696
error_t bring_up_interface(const char *const interface,
1697
const float delay){
1698
error_t old_errno = errno;
1699
int ret;
1700
struct ifreq network;
1701
unsigned int if_index = if_nametoindex(interface);
1702
if(if_index == 0){
1703
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1704
errno = old_errno;
1705
return ENXIO;
1706
}
1707
1708
if(quit_now){
1709
errno = old_errno;
1710
return EINTR;
1711
}
1712
1713
if(not interface_is_up(interface)){
1714
error_t ret_errno = 0, ioctl_errno = 0;
1715
if(not get_flags(interface, &network)){
1716
ret_errno = errno;
1717
fprintf_plus(stderr, "Failed to get flags for interface "
1718
"\"%s\"\n", interface);
1719
errno = old_errno;
1720
return ret_errno;
1721
}
1722
network.ifr_flags |= IFF_UP; /* set flag */
1723
1724
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1725
if(sd == -1){
1726
ret_errno = errno;
1727
perror_plus("socket");
1728
errno = old_errno;
1729
return ret_errno;
1730
}
1731
1732
if(quit_now){
1733
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1734
if(ret == -1){
1735
perror_plus("close");
1736
}
1737
errno = old_errno;
1738
return EINTR;
1739
}
1740
1741
if(debug){
1742
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1743
interface);
1744
}
1745
1746
/* Raise privileges */
1747
ret_errno = raise_privileges();
1748
if(ret_errno != 0){
1749
errno = ret_errno;
1750
perror_plus("Failed to raise privileges");
1751
}
1752
1753
#ifdef __linux__
1754
int ret_linux;
1755
bool restore_loglevel = false;
1756
if(ret_errno == 0){
1757
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1758
messages about the network interface to mess up the prompt */
1759
ret_linux = klogctl(8, NULL, 5);
1760
if(ret_linux == -1){
1761
perror_plus("klogctl");
1762
} else {
1763
restore_loglevel = true;
1764
}
1765
}
1766
#endif /* __linux__ */
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1768
ioctl_errno = errno;
1769
#ifdef __linux__
1770
if(restore_loglevel){
1771
ret_linux = klogctl(7, NULL, 0);
1772
if(ret_linux == -1){
1773
perror_plus("klogctl");
1774
}
1775
}
1776
#endif /* __linux__ */
1777
1778
/* If raise_privileges() succeeded above */
1779
if(ret_errno == 0){
1780
/* Lower privileges */
1781
ret_errno = lower_privileges();
1782
if(ret_errno != 0){
1783
errno = ret_errno;
1784
perror_plus("Failed to lower privileges");
1785
}
1786
}
1787
1788
/* Close the socket */
1789
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1790
if(ret == -1){
1791
perror_plus("close");
1792
}
1793
1794
if(ret_setflags == -1){
1795
errno = ioctl_errno;
1796
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1797
errno = old_errno;
1798
return ioctl_errno;
1799
}
1800
} else if(debug){
1801
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1802
interface);
1803
}
1804
1805
/* Sleep checking until interface is running.
1806
Check every 0.25s, up to total time of delay */
1807
for(int i=0; i < delay * 4; i++){
1808
if(interface_is_running(interface)){
1809
break;
1810
}
1811
struct timespec sleeptime = { .tv_nsec = 250000000 };
1812
ret = nanosleep(&sleeptime, NULL);
1813
if(ret == -1 and errno != EINTR){
1814
perror_plus("nanosleep");
1815
}
1816
}
1817
1818
errno = old_errno;
1819
return 0;
1820
}
1821
1822
__attribute__((nonnull, warn_unused_result))
1823
error_t take_down_interface(const char *const interface){
1824
error_t old_errno = errno;
1825
struct ifreq network;
1826
unsigned int if_index = if_nametoindex(interface);
1827
if(if_index == 0){
1828
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1829
errno = old_errno;
1830
return ENXIO;
1831
}
1832
if(interface_is_up(interface)){
1833
error_t ret_errno = 0, ioctl_errno = 0;
1834
if(not get_flags(interface, &network) and debug){
1835
ret_errno = errno;
1836
fprintf_plus(stderr, "Failed to get flags for interface "
1837
"\"%s\"\n", interface);
1838
errno = old_errno;
1839
return ret_errno;
1840
}
1841
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1842
1843
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1844
if(sd == -1){
1845
ret_errno = errno;
1846
perror_plus("socket");
1847
errno = old_errno;
1848
return ret_errno;
1849
}
1850
1851
if(debug){
1852
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1853
interface);
1854
}
1855
1856
/* Raise privileges */
1857
ret_errno = raise_privileges();
1858
if(ret_errno != 0){
1859
errno = ret_errno;
1860
perror_plus("Failed to raise privileges");
1861
}
1862
1863
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1864
ioctl_errno = errno;
1865
1866
/* If raise_privileges() succeeded above */
1867
if(ret_errno == 0){
1868
/* Lower privileges */
1869
ret_errno = lower_privileges();
1870
if(ret_errno != 0){
1871
errno = ret_errno;
1872
perror_plus("Failed to lower privileges");
1873
}
1874
}
1875
1876
/* Close the socket */
1877
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1878
if(ret == -1){
1879
perror_plus("close");
1880
}
1881
1882
if(ret_setflags == -1){
1883
errno = ioctl_errno;
1884
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1885
errno = old_errno;
1886
return ioctl_errno;
1887
}
1888
} else if(debug){
1889
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1890
interface);
1891
}
1892
1893
errno = old_errno;
1894
return 0;
890
1895
}
891
1896
892
1897
int main(int argc, char *argv[]){
1898
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1899
.priority = "SECURE256:!CTYPE-X.509:"
1900
"+CTYPE-OPENPGP", .current_server = NULL,
1901
.interfaces = NULL, .interfaces_size = 0 };
893
1902
AvahiSServiceBrowser *sb = NULL;
894
int error;
1903
error_t ret_errno;
895
1904
int ret;
896
1905
intmax_t tmpmax;
897
1906
char *tmp;
898
1907
int exitcode = EXIT_SUCCESS;
899
const char *interface = "eth0";
900
struct ifreq network;
901
int sd;
902
uid_t uid;
903
gid_t gid;
904
char *connect_to = NULL;
905
char tempdir[] = "/tmp/mandosXXXXXX";
906
bool tempdir_created = false;
1908
char *interfaces_to_take_down = NULL;
1909
size_t interfaces_to_take_down_size = 0;
1910
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1911
char old_tempdir[] = "/tmp/mandosXXXXXX";
1912
char *tempdir = NULL;
907
1913
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
908
1914
const char *seckey = PATHDIR "/" SECKEY;
909
1915
const char *pubkey = PATHDIR "/" PUBKEY;
1916
char *interfaces_hooks = NULL;
910
1917
911
/* Initialize Mandos context */
912
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
913
.dh_bits = 1024, .priority = "SECURE256"
914
":!CTYPE-X.509:+CTYPE-OPENPGP" };
915
1918
bool gnutls_initialized = false;
916
1919
bool gpgme_initialized = false;
917
1920
float delay = 2.5f;
1921
double retry_interval = 10; /* 10s between trying a server and
1922
retrying the same server again */
918
1923
919
struct sigaction old_sigterm_action;
1924
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
920
1925
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
921
1926
1927
uid = getuid();
1928
gid = getgid();
1929
1930
/* Lower any group privileges we might have, just to be safe */
1931
errno = 0;
1932
ret = setgid(gid);
1933
if(ret == -1){
1934
perror_plus("setgid");
1935
}
1936
1937
/* Lower user privileges (temporarily) */
1938
errno = 0;
1939
ret = seteuid(uid);
1940
if(ret == -1){
1941
perror_plus("seteuid");
1942
}
1943
1944
if(quit_now){
1945
goto end;
1946
}
1947
922
1948
{
923
1949
struct argp_option options[] = {
924
1950
{ .name = "debug", .key = 128,
953
1979
.arg = "SECONDS",
954
1980
.doc = "Maximum delay to wait for interface startup",
955
1981
.group = 2 },
1982
{ .name = "retry", .key = 132,
1983
.arg = "SECONDS",
1984
.doc = "Retry interval used when denied by the Mandos server",
1985
.group = 2 },
1986
{ .name = "network-hook-dir", .key = 133,
1987
.arg = "DIR",
1988
.doc = "Directory where network hooks are located",
1989
.group = 2 },
1990
/*
1991
* These reproduce what we would get without ARGP_NO_HELP
1992
*/
1993
{ .name = "help", .key = '?',
1994
.doc = "Give this help list", .group = -1 },
1995
{ .name = "usage", .key = -3,
1996
.doc = "Give a short usage message", .group = -1 },
1997
{ .name = "version", .key = 'V',
1998
.doc = "Print program version", .group = -1 },
956
1999
{ .name = NULL }
957
2000
};
958
2001
959
2002
error_t parse_opt(int key, char *arg,
960
2003
struct argp_state *state){
2004
errno = 0;
961
2005
switch(key){
962
2006
case 128: /* --debug */
963
2007
debug = true;
966
2010
connect_to = arg;
967
2011
break;
968
2012
case 'i': /* --interface */
969
interface = arg;
2013
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2014
arg, (int)',');
2015
if(ret_errno != 0){
2016
argp_error(state, "%s", strerror(ret_errno));
2017
}
970
2018
break;
971
2019
case 's': /* --seckey */
972
2020
seckey = arg;
979
2027
tmpmax = strtoimax(arg, &tmp, 10);
980
2028
if(errno != 0 or tmp == arg or *tmp != '\0'
981
2029
or tmpmax != (typeof(mc.dh_bits))tmpmax){
982
fprintf(stderr, "Bad number of DH bits\n");
983
exit(EXIT_FAILURE);
2030
argp_error(state, "Bad number of DH bits");
984
2031
}
985
2032
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
986
2033
break;
991
2038
errno = 0;
992
2039
delay = strtof(arg, &tmp);
993
2040
if(errno != 0 or tmp == arg or *tmp != '\0'){
994
fprintf(stderr, "Bad delay\n");
995
exit(EXIT_FAILURE);
996
}
997
break;
998
case ARGP_KEY_ARG:
999
argp_usage(state);
1000
case ARGP_KEY_END:
2041
argp_error(state, "Bad delay");
2042
}
2043
case 132: /* --retry */
2044
errno = 0;
2045
retry_interval = strtod(arg, &tmp);
2046
if(errno != 0 or tmp == arg or *tmp != '\0'
2047
or (retry_interval * 1000) > INT_MAX
2048
or retry_interval < 0){
2049
argp_error(state, "Bad retry interval");
2050
}
2051
break;
2052
case 133: /* --network-hook-dir */
2053
hookdir = arg;
2054
break;
2055
/*
2056
* These reproduce what we would get without ARGP_NO_HELP
2057
*/
2058
case '?': /* --help */
2059
argp_state_help(state, state->out_stream,
2060
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2061
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2062
case -3: /* --usage */
2063
argp_state_help(state, state->out_stream,
2064
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2065
case 'V': /* --version */
2066
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2067
exit(argp_err_exit_status);
1001
2068
break;
1002
2069
default:
1003
2070
return ARGP_ERR_UNKNOWN;
1004
2071
}
1005
return 0;
2072
return errno;
1006
2073
}
1007
2074
1008
2075
struct argp argp = { .options = options, .parser = parse_opt,
1009
2076
.args_doc = "",
1010
2077
.doc = "Mandos client -- Get and decrypt"
1011
2078
" passwords from a Mandos server" };
1012
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1013
if(ret == ARGP_ERR_UNKNOWN){
1014
fprintf(stderr, "Unknown error while parsing arguments\n");
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1017
}
2079
ret = argp_parse(&argp, argc, argv,
2080
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2081
switch(ret){
2082
case 0:
2083
break;
2084
case ENOMEM:
2085
default:
2086
errno = ret;
2087
perror_plus("argp_parse");
2088
exitcode = EX_OSERR;
2089
goto end;
2090
case EINVAL:
2091
exitcode = EX_USAGE;
2092
goto end;
2093
}
2094
}
2095
2096
{
2097
/* Work around Debian bug #633582:
2098
<http://bugs.debian.org/633582> */
2099
2100
/* Re-raise privileges */
2101
ret_errno = raise_privileges();
2102
if(ret_errno != 0){
2103
errno = ret_errno;
2104
perror_plus("Failed to raise privileges");
2105
} else {
2106
struct stat st;
2107
2108
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2109
int seckey_fd = open(seckey, O_RDONLY);
2110
if(seckey_fd == -1){
2111
perror_plus("open");
2112
} else {
2113
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2114
if(ret == -1){
2115
perror_plus("fstat");
2116
} else {
2117
if(S_ISREG(st.st_mode)
2118
and st.st_uid == 0 and st.st_gid == 0){
2119
ret = fchown(seckey_fd, uid, gid);
2120
if(ret == -1){
2121
perror_plus("fchown");
2122
}
2123
}
2124
}
2125
TEMP_FAILURE_RETRY(close(seckey_fd));
2126
}
2127
}
2128
2129
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2130
int pubkey_fd = open(pubkey, O_RDONLY);
2131
if(pubkey_fd == -1){
2132
perror_plus("open");
2133
} else {
2134
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2135
if(ret == -1){
2136
perror_plus("fstat");
2137
} else {
2138
if(S_ISREG(st.st_mode)
2139
and st.st_uid == 0 and st.st_gid == 0){
2140
ret = fchown(pubkey_fd, uid, gid);
2141
if(ret == -1){
2142
perror_plus("fchown");
2143
}
2144
}
2145
}
2146
TEMP_FAILURE_RETRY(close(pubkey_fd));
2147
}
2148
}
2149
2150
/* Lower privileges */
2151
ret_errno = lower_privileges();
2152
if(ret_errno != 0){
2153
errno = ret_errno;
2154
perror_plus("Failed to lower privileges");
2155
}
2156
}
2157
}
2158
2159
/* Remove invalid interface names (except "none") */
2160
{
2161
char *interface = NULL;
2162
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2163
interface))){
2164
if(strcmp(interface, "none") != 0
2165
and if_nametoindex(interface) == 0){
2166
if(interface[0] != '\0'){
2167
fprintf_plus(stderr, "Not using nonexisting interface"
2168
" \"%s\"\n", interface);
2169
}
2170
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2171
interface = NULL;
2172
}
2173
}
2174
}
2175
2176
/* Run network hooks */
2177
{
2178
if(mc.interfaces != NULL){
2179
interfaces_hooks = malloc(mc.interfaces_size);
2180
if(interfaces_hooks == NULL){
2181
perror_plus("malloc");
2182
goto end;
2183
}
2184
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2185
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2186
}
2187
run_network_hooks("start", interfaces_hooks != NULL ?
2188
interfaces_hooks : "", delay);
1018
2189
}
1019
2190
1020
2191
if(not debug){
1025
2196
from the signal handler */
1026
2197
/* Initialize the pseudo-RNG for Avahi */
1027
2198
srand((unsigned int) time(NULL));
1028
mc.simple_poll = avahi_simple_poll_new();
1029
if(mc.simple_poll == NULL){
1030
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1031
exitcode = EXIT_FAILURE;
2199
simple_poll = avahi_simple_poll_new();
2200
if(simple_poll == NULL){
2201
fprintf_plus(stderr,
2202
"Avahi: Failed to create simple poll object.\n");
2203
exitcode = EX_UNAVAILABLE;
1032
2204
goto end;
1033
2205
}
1034
2206
1035
2207
sigemptyset(&sigterm_action.sa_mask);
1036
2208
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1037
2209
if(ret == -1){
1038
perror("sigaddset");
1039
exitcode = EXIT_FAILURE;
2210
perror_plus("sigaddset");
2211
exitcode = EX_OSERR;
1040
2212
goto end;
1041
2213
}
1042
2214
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1043
2215
if(ret == -1){
1044
perror("sigaddset");
1045
exitcode = EXIT_FAILURE;
2216
perror_plus("sigaddset");
2217
exitcode = EX_OSERR;
1046
2218
goto end;
1047
2219
}
1048
2220
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1049
2221
if(ret == -1){
1050
perror("sigaddset");
1051
exitcode = EXIT_FAILURE;
1052
goto end;
1053
}
1054
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1055
if(ret == -1){
1056
perror("sigaction");
1057
exitcode = EXIT_FAILURE;
1058
goto end;
1059
}
1060
1061
/* If the interface is down, bring it up */
1062
if(interface[0] != '\0'){
1063
#ifdef __linux__
1064
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1065
messages to mess up the prompt */
1066
ret = klogctl(8, NULL, 5);
1067
bool restore_loglevel = true;
1068
if(ret == -1){
1069
restore_loglevel = false;
1070
perror("klogctl");
1071
}
1072
#endif /* __linux__ */
1073
1074
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1075
if(sd < 0){
1076
perror("socket");
1077
exitcode = EXIT_FAILURE;
1078
#ifdef __linux__
1079
if(restore_loglevel){
1080
ret = klogctl(7, NULL, 0);
1081
if(ret == -1){
1082
perror("klogctl");
1083
}
1084
}
1085
#endif /* __linux__ */
1086
goto end;
1087
}
1088
strcpy(network.ifr_name, interface);
1089
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1090
if(ret == -1){
1091
perror("ioctl SIOCGIFFLAGS");
1092
#ifdef __linux__
1093
if(restore_loglevel){
1094
ret = klogctl(7, NULL, 0);
1095
if(ret == -1){
1096
perror("klogctl");
1097
}
1098
}
1099
#endif /* __linux__ */
1100
exitcode = EXIT_FAILURE;
1101
goto end;
1102
}
1103
if((network.ifr_flags & IFF_UP) == 0){
1104
network.ifr_flags |= IFF_UP;
1105
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1106
if(ret == -1){
1107
perror("ioctl SIOCSIFFLAGS");
1108
exitcode = EXIT_FAILURE;
1109
#ifdef __linux__
1110
if(restore_loglevel){
1111
ret = klogctl(7, NULL, 0);
1112
if(ret == -1){
1113
perror("klogctl");
2222
perror_plus("sigaddset");
2223
exitcode = EX_OSERR;
2224
goto end;
2225
}
2226
/* Need to check if the handler is SIG_IGN before handling:
2227
| [[info:libc:Initial Signal Actions]] |
2228
| [[info:libc:Basic Signal Handling]] |
2229
*/
2230
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2231
if(ret == -1){
2232
perror_plus("sigaction");
2233
return EX_OSERR;
2234
}
2235
if(old_sigterm_action.sa_handler != SIG_IGN){
2236
ret = sigaction(SIGINT, &sigterm_action, NULL);
2237
if(ret == -1){
2238
perror_plus("sigaction");
2239
exitcode = EX_OSERR;
2240
goto end;
2241
}
2242
}
2243
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2244
if(ret == -1){
2245
perror_plus("sigaction");
2246
return EX_OSERR;
2247
}
2248
if(old_sigterm_action.sa_handler != SIG_IGN){
2249
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2250
if(ret == -1){
2251
perror_plus("sigaction");
2252
exitcode = EX_OSERR;
2253
goto end;
2254
}
2255
}
2256
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2257
if(ret == -1){
2258
perror_plus("sigaction");
2259
return EX_OSERR;
2260
}
2261
if(old_sigterm_action.sa_handler != SIG_IGN){
2262
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2263
if(ret == -1){
2264
perror_plus("sigaction");
2265
exitcode = EX_OSERR;
2266
goto end;
2267
}
2268
}
2269
2270
/* If no interfaces were specified, make a list */
2271
if(mc.interfaces == NULL){
2272
struct dirent **direntries = NULL;
2273
/* Look for any good interfaces */
2274
ret = scandir(sys_class_net, &direntries, good_interface,
2275
alphasort);
2276
if(ret >= 1){
2277
/* Add all found interfaces to interfaces list */
2278
for(int i = 0; i < ret; ++i){
2279
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2280
direntries[i]->d_name);
2281
if(ret_errno != 0){
2282
errno = ret_errno;
2283
perror_plus("argz_add");
2284
free(direntries[i]);
2285
continue;
2286
}
2287
if(debug){
2288
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2289
direntries[i]->d_name);
2290
}
2291
free(direntries[i]);
2292
}
2293
free(direntries);
2294
} else {
2295
if(ret == 0){
2296
free(direntries);
2297
}
2298
fprintf_plus(stderr, "Could not find a network interface\n");
2299
exitcode = EXIT_FAILURE;
2300
goto end;
2301
}
2302
}
2303
2304
/* Bring up interfaces which are down, and remove any "none"s */
2305
{
2306
char *interface = NULL;
2307
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2308
interface))){
2309
/* If interface name is "none", stop bringing up interfaces.
2310
Also remove all instances of "none" from the list */
2311
if(strcmp(interface, "none") == 0){
2312
argz_delete(&mc.interfaces, &mc.interfaces_size,
2313
interface);
2314
interface = NULL;
2315
while((interface = argz_next(mc.interfaces,
2316
mc.interfaces_size, interface))){
2317
if(strcmp(interface, "none") == 0){
2318
argz_delete(&mc.interfaces, &mc.interfaces_size,
2319
interface);
2320
interface = NULL;
1114
2321
}
1115
2322
}
1116
#endif /* __linux__ */
1117
goto end;
1118
}
1119
}
1120
/* sleep checking until interface is running */
1121
for(int i=0; i < delay * 4; i++){
1122
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1123
if(ret == -1){
1124
perror("ioctl SIOCGIFFLAGS");
1125
} else if(network.ifr_flags & IFF_RUNNING){
1126
2323
break;
1127
2324
}
1128
struct timespec sleeptime = { .tv_nsec = 250000000 };
1129
ret = nanosleep(&sleeptime, NULL);
1130
if(ret == -1 and errno != EINTR){
1131
perror("nanosleep");
1132
}
1133
}
1134
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1135
if(ret == -1){
1136
perror("close");
1137
}
1138
#ifdef __linux__
1139
if(restore_loglevel){
1140
/* Restores kernel loglevel to default */
1141
ret = klogctl(7, NULL, 0);
1142
if(ret == -1){
1143
perror("klogctl");
1144
}
1145
}
1146
#endif /* __linux__ */
1147
}
1148
1149
uid = getuid();
1150
gid = getgid();
1151
1152
errno = 0;
1153
setgid(gid);
1154
if(ret == -1){
1155
perror("setgid");
1156
}
1157
1158
ret = setuid(uid);
1159
if(ret == -1){
1160
perror("setuid");
1161
}
1162
1163
ret = init_gnutls_global(pubkey, seckey);
1164
if(ret == -1){
1165
fprintf(stderr, "init_gnutls_global failed\n");
1166
exitcode = EXIT_FAILURE;
2325
bool interface_was_up = interface_is_up(interface);
2326
errno = bring_up_interface(interface, delay);
2327
if(not interface_was_up){
2328
if(errno != 0){
2329
perror_plus("Failed to bring up interface");
2330
} else {
2331
errno = argz_add(&interfaces_to_take_down,
2332
&interfaces_to_take_down_size,
2333
interface);
2334
if(errno != 0){
2335
perror_plus("argz_add");
2336
}
2337
}
2338
}
2339
}
2340
if(debug and (interfaces_to_take_down == NULL)){
2341
fprintf_plus(stderr, "No interfaces were brought up\n");
2342
}
2343
}
2344
2345
/* If we only got one interface, explicitly use only that one */
2346
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2347
if(debug){
2348
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2349
mc.interfaces);
2350
}
2351
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2352
}
2353
2354
if(quit_now){
2355
goto end;
2356
}
2357
2358
ret = init_gnutls_global(pubkey, seckey, &mc);
2359
if(ret == -1){
2360
fprintf_plus(stderr, "init_gnutls_global failed\n");
2361
exitcode = EX_UNAVAILABLE;
1167
2362
goto end;
1168
2363
} else {
1169
2364
gnutls_initialized = true;
1170
2365
}
1171
2366
1172
if(mkdtemp(tempdir) == NULL){
1173
perror("mkdtemp");
1174
goto end;
1175
}
1176
tempdir_created = true;
1177
1178
if(not init_gpgme(pubkey, seckey, tempdir)){
1179
fprintf(stderr, "init_gpgme failed\n");
1180
exitcode = EXIT_FAILURE;
2367
if(quit_now){
2368
goto end;
2369
}
2370
2371
/* Try /run/tmp before /tmp */
2372
tempdir = mkdtemp(run_tempdir);
2373
if(tempdir == NULL and errno == ENOENT){
2374
if(debug){
2375
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2376
run_tempdir, old_tempdir);
2377
}
2378
tempdir = mkdtemp(old_tempdir);
2379
}
2380
if(tempdir == NULL){
2381
perror_plus("mkdtemp");
2382
goto end;
2383
}
2384
2385
if(quit_now){
2386
goto end;
2387
}
2388
2389
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2390
fprintf_plus(stderr, "init_gpgme failed\n");
2391
exitcode = EX_UNAVAILABLE;
1181
2392
goto end;
1182
2393
} else {
1183
2394
gpgme_initialized = true;
1184
2395
}
1185
2396
1186
if(interface[0] != '\0'){
1187
if_index = (AvahiIfIndex) if_nametoindex(interface);
1188
if(if_index == 0){
1189
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1190
exitcode = EXIT_FAILURE;
1191
goto end;
1192
}
2397
if(quit_now){
2398
goto end;
1193
2399
}
1194
2400
1195
2401
if(connect_to != NULL){
1196
2402
/* Connect directly, do not use Zeroconf */
1197
2403
/* (Mainly meant for debugging) */
1198
2404
char *address = strrchr(connect_to, ':');
2405
1199
2406
if(address == NULL){
1200
fprintf(stderr, "No colon in address\n");
1201
exitcode = EXIT_FAILURE;
1202
goto end;
1203
}
1204
uint16_t port;
2407
fprintf_plus(stderr, "No colon in address\n");
2408
exitcode = EX_USAGE;
2409
goto end;
2410
}
2411
2412
if(quit_now){
2413
goto end;
2414
}
2415
2416
in_port_t port;
1205
2417
errno = 0;
1206
2418
tmpmax = strtoimax(address+1, &tmp, 10);
1207
2419
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1208
or tmpmax != (uint16_t)tmpmax){
1209
fprintf(stderr, "Bad port number\n");
1210
exitcode = EXIT_FAILURE;
1211
goto end;
1212
}
1213
port = (uint16_t)tmpmax;
2420
or tmpmax != (in_port_t)tmpmax){
2421
fprintf_plus(stderr, "Bad port number\n");
2422
exitcode = EX_USAGE;
2423
goto end;
2424
}
2425
2426
if(quit_now){
2427
goto end;
2428
}
2429
2430
port = (in_port_t)tmpmax;
1214
2431
*address = '\0';
1215
address = connect_to;
1216
2432
/* Colon in address indicates IPv6 */
1217
2433
int af;
1218
if(strchr(address, ':') != NULL){
2434
if(strchr(connect_to, ':') != NULL){
1219
2435
af = AF_INET6;
2436
/* Accept [] around IPv6 address - see RFC 5952 */
2437
if(connect_to[0] == '[' and address[-1] == ']')
2438
{
2439
connect_to++;
2440
address[-1] = '\0';
2441
}
1220
2442
} else {
1221
2443
af = AF_INET;
1222
2444
}
1223
ret = start_mandos_communication(address, port, if_index, af);
1224
if(ret < 0){
1225
exitcode = EXIT_FAILURE;
1226
} else {
2445
address = connect_to;
2446
2447
if(quit_now){
2448
goto end;
2449
}
2450
2451
while(not quit_now){
2452
ret = start_mandos_communication(address, port, if_index, af,
2453
&mc);
2454
if(quit_now or ret == 0){
2455
break;
2456
}
2457
if(debug){
2458
fprintf_plus(stderr, "Retrying in %d seconds\n",
2459
(int)retry_interval);
2460
}
2461
sleep((unsigned int)retry_interval);
2462
}
2463
2464
if(not quit_now){
1227
2465
exitcode = EXIT_SUCCESS;
1228
2466
}
1229
goto end;
1230
}
1231
2467
2468
goto end;
2469
}
2470
2471
if(quit_now){
2472
goto end;
2473
}
2474
1232
2475
{
1233
2476
AvahiServerConfig config;
1234
2477
/* Do not publish any local Zeroconf records */
1239
2482
config.publish_domain = 0;
1240
2483
1241
2484
/* Allocate a new server */
1242
mc.server = avahi_server_new(avahi_simple_poll_get
1243
(mc.simple_poll), &config, NULL,
1244
NULL, &error);
2485
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2486
&config, NULL, NULL, &ret_errno);
1245
2487
1246
2488
/* Free the Avahi configuration data */
1247
2489
avahi_server_config_free(&config);
1249
2491
1250
2492
/* Check if creating the Avahi server object succeeded */
1251
2493
if(mc.server == NULL){
1252
fprintf(stderr, "Failed to create Avahi server: %s\n",
1253
avahi_strerror(error));
1254
exitcode = EXIT_FAILURE;
2494
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2495
avahi_strerror(ret_errno));
2496
exitcode = EX_UNAVAILABLE;
2497
goto end;
2498
}
2499
2500
if(quit_now){
1255
2501
goto end;
1256
2502
}
1257
2503
1258
2504
/* Create the Avahi service browser */
1259
2505
sb = avahi_s_service_browser_new(mc.server, if_index,
1260
AVAHI_PROTO_INET6, "_mandos._tcp",
1261
NULL, 0, browse_callback, NULL);
2506
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2507
NULL, 0, browse_callback,
2508
(void *)&mc);
1262
2509
if(sb == NULL){
1263
fprintf(stderr, "Failed to create service browser: %s\n",
1264
avahi_strerror(avahi_server_errno(mc.server)));
1265
exitcode = EXIT_FAILURE;
2510
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2511
avahi_strerror(avahi_server_errno(mc.server)));
2512
exitcode = EX_UNAVAILABLE;
2513
goto end;
2514
}
2515
2516
if(quit_now){
1266
2517
goto end;
1267
2518
}
1268
2519
1269
2520
/* Run the main loop */
1270
2521
1271
2522
if(debug){
1272
fprintf(stderr, "Starting Avahi loop search\n");
2523
fprintf_plus(stderr, "Starting Avahi loop search\n");
1273
2524
}
1274
2525
1275
avahi_simple_poll_loop(mc.simple_poll);
2526
ret = avahi_loop_with_timeout(simple_poll,
2527
(int)(retry_interval * 1000), &mc);
2528
if(debug){
2529
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2530
(ret == 0) ? "successfully" : "with error");
2531
}
1276
2532
1277
2533
end:
1278
2534
1279
2535
if(debug){
1280
fprintf(stderr, "%s exiting\n", argv[0]);
2536
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1281
2537
}
1282
2538
1283
2539
/* Cleanup things */
2540
free(mc.interfaces);
2541
1284
2542
if(sb != NULL)
1285
2543
avahi_s_service_browser_free(sb);
1286
2544
1287
2545
if(mc.server != NULL)
1288
2546
avahi_server_free(mc.server);
1289
2547
1290
if(mc.simple_poll != NULL)
1291
avahi_simple_poll_free(mc.simple_poll);
2548
if(simple_poll != NULL)
2549
avahi_simple_poll_free(simple_poll);
1292
2550
1293
2551
if(gnutls_initialized){
1294
2552
gnutls_certificate_free_credentials(mc.cred);
1300
2558
gpgme_release(mc.ctx);
1301
2559
}
1302
2560
1303
/* Removes the temp directory used by GPGME */
1304
if(tempdir_created){
1305
DIR *d;
1306
struct dirent *direntry;
1307
d = opendir(tempdir);
1308
if(d == NULL){
1309
if(errno != ENOENT){
1310
perror("opendir");
1311
}
1312
} else {
1313
while(true){
1314
direntry = readdir(d);
1315
if(direntry == NULL){
1316
break;
1317
}
1318
/* Skip "." and ".." */
1319
if(direntry->d_name[0] == '.'
1320
and (direntry->d_name[1] == '\0'
1321
or (direntry->d_name[1] == '.'
1322
and direntry->d_name[2] == '\0'))){
1323
continue;
1324
}
1325
char *fullname = NULL;
1326
ret = asprintf(&fullname, "%s/%s", tempdir,
1327
direntry->d_name);
1328
if(ret < 0){
1329
perror("asprintf");
1330
continue;
1331
}
1332
ret = remove(fullname);
1333
if(ret == -1){
1334
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1335
strerror(errno));
1336
}
1337
free(fullname);
1338
}
1339
closedir(d);
1340
}
1341
ret = rmdir(tempdir);
1342
if(ret == -1 and errno != ENOENT){
1343
perror("rmdir");
1344
}
2561
/* Cleans up the circular linked list of Mandos servers the client
2562
has seen */
2563
if(mc.current_server != NULL){
2564
mc.current_server->prev->next = NULL;
2565
while(mc.current_server != NULL){
2566
server *next = mc.current_server->next;
2567
#ifdef __GNUC__
2568
#pragma GCC diagnostic push
2569
#pragma GCC diagnostic ignored "-Wcast-qual"
2570
#endif
2571
free((char *)(mc.current_server->ip));
2572
#ifdef __GNUC__
2573
#pragma GCC diagnostic pop
2574
#endif
2575
free(mc.current_server);
2576
mc.current_server = next;
2577
}
2578
}
2579
2580
/* Re-raise privileges */
2581
{
2582
ret_errno = raise_privileges();
2583
if(ret_errno != 0){
2584
errno = ret_errno;
2585
perror_plus("Failed to raise privileges");
2586
} else {
2587
2588
/* Run network hooks */
2589
run_network_hooks("stop", interfaces_hooks != NULL ?
2590
interfaces_hooks : "", delay);
2591
2592
/* Take down the network interfaces which were brought up */
2593
{
2594
char *interface = NULL;
2595
while((interface=argz_next(interfaces_to_take_down,
2596
interfaces_to_take_down_size,
2597
interface))){
2598
ret_errno = take_down_interface(interface);
2599
if(ret_errno != 0){
2600
errno = ret_errno;
2601
perror_plus("Failed to take down interface");
2602
}
2603
}
2604
if(debug and (interfaces_to_take_down == NULL)){
2605
fprintf_plus(stderr, "No interfaces needed to be taken"
2606
" down\n");
2607
}
2608
}
2609
}
2610
2611
ret_errno = lower_privileges_permanently();
2612
if(ret_errno != 0){
2613
errno = ret_errno;
2614
perror_plus("Failed to lower privileges permanently");
2615
}
2616
}
2617
2618
free(interfaces_to_take_down);
2619
free(interfaces_hooks);
2620
2621
/* Removes the GPGME temp directory and all files inside */
2622
if(tempdir != NULL){
2623
struct dirent **direntries = NULL;
2624
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2625
O_NOFOLLOW));
2626
if(tempdir_fd == -1){
2627
perror_plus("open");
2628
} else {
2629
#ifdef __GLIBC__
2630
#if __GLIBC_PREREQ(2, 15)
2631
int numentries = scandirat(tempdir_fd, ".", &direntries,
2632
notdotentries, alphasort);
2633
#else /* not __GLIBC_PREREQ(2, 15) */
2634
int numentries = scandir(tempdir, &direntries, notdotentries,
2635
alphasort);
2636
#endif /* not __GLIBC_PREREQ(2, 15) */
2637
#else /* not __GLIBC__ */
2638
int numentries = scandir(tempdir, &direntries, notdotentries,
2639
alphasort);
2640
#endif /* not __GLIBC__ */
2641
if(numentries >= 0){
2642
for(int i = 0; i < numentries; i++){
2643
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2644
if(ret == -1){
2645
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2646
" \"%s\", 0): %s\n", tempdir,
2647
direntries[i]->d_name, strerror(errno));
2648
}
2649
free(direntries[i]);
2650
}
2651
2652
/* need to clean even if 0 because man page doesn't specify */
2653
free(direntries);
2654
if(numentries == -1){
2655
perror_plus("scandir");
2656
}
2657
ret = rmdir(tempdir);
2658
if(ret == -1 and errno != ENOENT){
2659
perror_plus("rmdir");
2660
}
2661
}
2662
TEMP_FAILURE_RETRY(close(tempdir_fd));
2663
}
2664
}
2665
2666
if(quit_now){
2667
sigemptyset(&old_sigterm_action.sa_mask);
2668
old_sigterm_action.sa_handler = SIG_DFL;
2669
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2670
&old_sigterm_action,
2671
NULL));
2672
if(ret == -1){
2673
perror_plus("sigaction");
2674
}
2675
do {
2676
ret = raise(signal_received);
2677
} while(ret != 0 and errno == EINTR);
2678
if(ret != 0){
2679
perror_plus("raise");
2680
abort();
2681
}
2682
TEMP_FAILURE_RETRY(pause());
1345
2683
}
1346
2684
1347
2685
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0