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- Committer: Teddy Hogeborn
- Date: 2009-02-13 05:38:21 UTC
- Revision ID: teddy@fukt.bsnet.se-20090213053821-03e696gckk4nbjps
Support not using IPv6 in server:
* mandos (AvahiService.__init__): Take new "protocol" parameter. All
callers changed.
(IPv6_TCPServer.__init__): Take new "use_ipv6" parameter. All
callers changed.
(IPv6_TCPServer.server_bind): Create IPv4 socket if not using IPv6.
(main): New "--no-ipv6" command line option. New "use_ipv6" config
option.
* mandos-options.xml ([@id="address"]): Document conditional IPv4
address support.
([@id="ipv6"]): New paragraph.
* mandos.conf (use_ipv6): New config option.
* mandos.conf.xml (OPTIONS): Document new "use_dbus" option.
(EXAMPLE): Changed to use IPv6 link-local address. Added "use_ipv6"
option.
* mandos.xml (SYNOPSIS): New "--no-ipv6" option.
(OPTIONS): Document new "--no-ipv6" option.
* mandos (AvahiService.__init__): Take new "protocol" parameter. All
callers changed.
(IPv6_TCPServer.__init__): Take new "use_ipv6" parameter. All
callers changed.
(IPv6_TCPServer.server_bind): Create IPv4 socket if not using IPv6.
(main): New "--no-ipv6" command line option. New "use_ipv6" config
option.
* mandos-options.xml ([@id="address"]): Document conditional IPv4
address support.
([@id="ipv6"]): New paragraph.
* mandos.conf (use_ipv6): New config option.
* mandos.conf.xml (OPTIONS): Document new "use_dbus" option.
(EXAMPLE): Changed to use IPv6 link-local address. Added "use_ipv6"
option.
* mandos.xml (SYNOPSIS): New "--no-ipv6" option.
(OPTIONS): Document new "--no-ipv6" option.
- files removed:
- 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 © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 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
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
39
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
40
#include <stdint.h> /* uint16_t, uint32_t */
45
41
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand(), strtof() */
48
44
#include <stdbool.h> /* bool, false, true */
49
45
#include <string.h> /* memset(), strcmp(), strlen(),
50
46
strerror(), asprintf(), strcpy() */
53
49
sockaddr_in6, PF_INET6,
54
50
SOCK_STREAM, uid_t, gid_t, open(),
55
51
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
52
#include <sys/stat.h> /* open() */
57
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
54
inet_pton(), connect() */
60
55
#include <fcntl.h> /* open() */
61
56
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
57
*/
63
58
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
59
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
60
#include <assert.h> /* assert() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
68
63
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
64
SIOCSIFFLAGS, if_indextoname(),
70
65
if_nametoindex(), IF_NAMESIZE */
72
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
68
*/
74
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
78
73
#include <iso646.h> /* not, or, and */
79
74
#include <argp.h> /* struct argp_option, error_t, struct
80
75
argp_state, struct argp,
81
76
argp_parse(), ARGP_KEY_ARG,
82
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
78
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
79
sigaction(), SIGTERM, sigaction,
80
sig_atomic_t */
97
81
98
82
#ifdef __linux__
99
83
#include <sys/klog.h> /* klogctl() */
117
101
init_gnutls_session(),
118
102
GNUTLS_* */
119
103
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
104
/* gnutls_certificate_set_openpgp_key_file(),
105
GNUTLS_OPENPGP_FMT_BASE64 */
122
106
123
107
/* GPGME */
124
108
#include <gpgme.h> /* All GPGME types, constants and
132
116
#define PATHDIR "/conf/conf.d/mandos"
133
117
#define SECKEY "seckey.txt"
134
118
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
136
119
137
120
bool debug = false;
138
121
static const char mandos_protocol_version[] = "1";
139
122
const char *argp_program_version = "mandos-client " VERSION;
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
141
static const char sys_class_net[] = "/sys/class/net";
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
144
int hookdir_fd = -1;
145
uid_t uid = 65534;
146
gid_t gid = 65534;
147
148
/* Doubly linked list that need to be circularly linked when used */
149
typedef struct server{
150
const char *ip;
151
in_port_t port;
152
AvahiIfIndex if_index;
153
int af;
154
struct timespec last_seen;
155
struct server *next;
156
struct server *prev;
157
} server;
123
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
158
124
159
125
/* Used for passing in values through the Avahi callback functions */
160
126
typedef struct {
127
AvahiSimplePoll *simple_poll;
161
128
AvahiServer *server;
162
129
gnutls_certificate_credentials_t cred;
163
130
unsigned int dh_bits;
164
131
gnutls_dh_params_t dh_params;
165
132
const char *priority;
166
133
gpgme_ctx_t ctx;
167
server *current_server;
168
char *interfaces;
169
size_t interfaces_size;
170
134
} mandos_context;
171
135
172
/* global so signal handler can reach it*/
173
AvahiSimplePoll *simple_poll;
174
175
sig_atomic_t quit_now = 0;
176
int signal_received = 0;
177
178
/* Function to use when printing errors */
179
void perror_plus(const char *print_text){
180
int e = errno;
181
fprintf(stderr, "Mandos plugin %s: ",
182
program_invocation_short_name);
183
errno = e;
184
perror(print_text);
185
}
186
187
__attribute__((format (gnu_printf, 2, 3), nonnull))
188
int fprintf_plus(FILE *stream, const char *format, ...){
189
va_list ap;
190
va_start (ap, format);
191
192
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
193
program_invocation_short_name));
194
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
}
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" };
196
140
197
141
/*
198
142
* Make additional room in "buffer" for at least BUFFER_SIZE more
199
143
* bytes. "buffer_capacity" is how much is currently allocated,
200
144
* "buffer_length" is how much is already used.
201
145
*/
202
__attribute__((nonnull, warn_unused_result))
203
146
size_t incbuffer(char **buffer, size_t buffer_length,
204
size_t buffer_capacity){
147
size_t buffer_capacity){
205
148
if(buffer_length + BUFFER_SIZE > buffer_capacity){
206
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
207
if(new_buf == NULL){
208
int old_errno = errno;
209
free(*buffer);
210
errno = old_errno;
211
*buffer = NULL;
149
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
150
if(buffer == NULL){
212
151
return 0;
213
152
}
214
*buffer = new_buf;
215
153
buffer_capacity += BUFFER_SIZE;
216
154
}
217
155
return buffer_capacity;
218
156
}
219
157
220
/* Add server to set of servers to retry periodically */
221
__attribute__((nonnull, warn_unused_result))
222
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
223
int af, server **current_server){
224
int ret;
225
server *new_server = malloc(sizeof(server));
226
if(new_server == NULL){
227
perror_plus("malloc");
228
return false;
229
}
230
*new_server = (server){ .ip = strdup(ip),
231
.port = port,
232
.if_index = if_index,
233
.af = af };
234
if(new_server->ip == NULL){
235
perror_plus("strdup");
236
return false;
237
}
238
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
239
if(ret == -1){
240
perror_plus("clock_gettime");
241
return false;
242
}
243
/* Special case of first server */
244
if(*current_server == NULL){
245
new_server->next = new_server;
246
new_server->prev = new_server;
247
*current_server = new_server;
248
} else {
249
/* Place the new server last in the list */
250
new_server->next = *current_server;
251
new_server->prev = (*current_server)->prev;
252
new_server->prev->next = new_server;
253
(*current_server)->prev = new_server;
254
}
255
return true;
256
}
257
258
158
/*
259
159
* Initialize GPGME.
260
160
*/
261
__attribute__((nonnull, warn_unused_result))
262
static bool init_gpgme(const char * const seckey,
263
const char * const pubkey,
264
const char * const tempdir,
265
mandos_context *mc){
161
static bool init_gpgme(const char *seckey,
162
const char *pubkey, const char *tempdir){
163
int ret;
266
164
gpgme_error_t rc;
267
165
gpgme_engine_info_t engine_info;
268
166
167
269
168
/*
270
169
* Helper function to insert pub and seckey to the engine keyring.
271
170
*/
272
bool import_key(const char * const filename){
273
int ret;
171
bool import_key(const char *filename){
274
172
int fd;
275
173
gpgme_data_t pgp_data;
276
174
277
175
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
278
176
if(fd == -1){
279
perror_plus("open");
177
perror("open");
280
178
return false;
281
179
}
282
180
283
181
rc = gpgme_data_new_from_fd(&pgp_data, fd);
284
182
if(rc != GPG_ERR_NO_ERROR){
285
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
183
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
184
gpgme_strsource(rc), gpgme_strerror(rc));
287
185
return false;
288
186
}
289
187
290
rc = gpgme_op_import(mc->ctx, pgp_data);
188
rc = gpgme_op_import(mc.ctx, pgp_data);
291
189
if(rc != GPG_ERR_NO_ERROR){
292
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
293
gpgme_strsource(rc), gpgme_strerror(rc));
190
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
294
192
return false;
295
193
}
296
194
297
195
ret = (int)TEMP_FAILURE_RETRY(close(fd));
298
196
if(ret == -1){
299
perror_plus("close");
197
perror("close");
300
198
}
301
199
gpgme_data_release(pgp_data);
302
200
return true;
303
201
}
304
202
305
203
if(debug){
306
fprintf_plus(stderr, "Initializing GPGME\n");
204
fprintf(stderr, "Initializing GPGME\n");
307
205
}
308
206
309
207
/* Init GPGME */
310
208
gpgme_check_version(NULL);
311
209
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
312
210
if(rc != GPG_ERR_NO_ERROR){
313
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
314
gpgme_strsource(rc), gpgme_strerror(rc));
211
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
212
gpgme_strsource(rc), gpgme_strerror(rc));
315
213
return false;
316
214
}
317
215
318
/* Set GPGME home directory for the OpenPGP engine only */
216
/* Set GPGME home directory for the OpenPGP engine only */
319
217
rc = gpgme_get_engine_info(&engine_info);
320
218
if(rc != GPG_ERR_NO_ERROR){
321
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
322
gpgme_strsource(rc), gpgme_strerror(rc));
219
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
220
gpgme_strsource(rc), gpgme_strerror(rc));
323
221
return false;
324
222
}
325
223
while(engine_info != NULL){
331
229
engine_info = engine_info->next;
332
230
}
333
231
if(engine_info == NULL){
334
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
335
tempdir);
232
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
336
233
return false;
337
234
}
338
235
339
236
/* Create new GPGME "context" */
340
rc = gpgme_new(&(mc->ctx));
237
rc = gpgme_new(&(mc.ctx));
341
238
if(rc != GPG_ERR_NO_ERROR){
342
fprintf_plus(stderr, "Mandos plugin mandos-client: "
343
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
344
gpgme_strerror(rc));
239
fprintf(stderr, "bad gpgme_new: %s: %s\n",
240
gpgme_strsource(rc), gpgme_strerror(rc));
345
241
return false;
346
242
}
347
243
349
245
return false;
350
246
}
351
247
352
return true;
248
return true;
353
249
}
354
250
355
251
/*
356
252
* Decrypt OpenPGP data.
357
253
* Returns -1 on error
358
254
*/
359
__attribute__((nonnull, warn_unused_result))
360
255
static ssize_t pgp_packet_decrypt(const char *cryptotext,
361
256
size_t crypto_size,
362
char **plaintext,
363
mandos_context *mc){
257
char **plaintext){
364
258
gpgme_data_t dh_crypto, dh_plain;
365
259
gpgme_error_t rc;
366
260
ssize_t ret;
368
262
ssize_t plaintext_length = 0;
369
263
370
264
if(debug){
371
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
265
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
372
266
}
373
267
374
268
/* Create new GPGME data buffer from memory cryptotext */
375
269
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
376
270
0);
377
271
if(rc != GPG_ERR_NO_ERROR){
378
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
379
gpgme_strsource(rc), gpgme_strerror(rc));
272
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
380
274
return -1;
381
275
}
382
276
383
277
/* Create new empty GPGME data buffer for the plaintext */
384
278
rc = gpgme_data_new(&dh_plain);
385
279
if(rc != GPG_ERR_NO_ERROR){
386
fprintf_plus(stderr, "Mandos plugin mandos-client: "
387
"bad gpgme_data_new: %s: %s\n",
388
gpgme_strsource(rc), gpgme_strerror(rc));
280
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
281
gpgme_strsource(rc), gpgme_strerror(rc));
389
282
gpgme_data_release(dh_crypto);
390
283
return -1;
391
284
}
392
285
393
286
/* Decrypt data from the cryptotext data buffer to the plaintext
394
287
data buffer */
395
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
288
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
396
289
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
398
gpgme_strsource(rc), gpgme_strerror(rc));
290
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
291
gpgme_strsource(rc), gpgme_strerror(rc));
399
292
plaintext_length = -1;
400
293
if(debug){
401
294
gpgme_decrypt_result_t result;
402
result = gpgme_op_decrypt_result(mc->ctx);
295
result = gpgme_op_decrypt_result(mc.ctx);
403
296
if(result == NULL){
404
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
297
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
405
298
} else {
406
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
407
result->unsupported_algorithm);
408
fprintf_plus(stderr, "Wrong key usage: %u\n",
409
result->wrong_key_usage);
299
fprintf(stderr, "Unsupported algorithm: %s\n",
300
result->unsupported_algorithm);
301
fprintf(stderr, "Wrong key usage: %u\n",
302
result->wrong_key_usage);
410
303
if(result->file_name != NULL){
411
fprintf_plus(stderr, "File name: %s\n", result->file_name);
304
fprintf(stderr, "File name: %s\n", result->file_name);
412
305
}
413
306
gpgme_recipient_t recipient;
414
307
recipient = result->recipients;
415
while(recipient != NULL){
416
fprintf_plus(stderr, "Public key algorithm: %s\n",
417
gpgme_pubkey_algo_name
418
(recipient->pubkey_algo));
419
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
420
fprintf_plus(stderr, "Secret key available: %s\n",
421
recipient->status == GPG_ERR_NO_SECKEY
422
? "No" : "Yes");
423
recipient = recipient->next;
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
}
424
318
}
425
319
}
426
320
}
428
322
}
429
323
430
324
if(debug){
431
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
325
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
432
326
}
433
327
434
328
/* Seek back to the beginning of the GPGME plaintext data buffer */
435
329
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
436
perror_plus("gpgme_data_seek");
330
perror("gpgme_data_seek");
437
331
plaintext_length = -1;
438
332
goto decrypt_end;
439
333
}
441
335
*plaintext = NULL;
442
336
while(true){
443
337
plaintext_capacity = incbuffer(plaintext,
444
(size_t)plaintext_length,
445
plaintext_capacity);
338
(size_t)plaintext_length,
339
plaintext_capacity);
446
340
if(plaintext_capacity == 0){
447
perror_plus("incbuffer");
448
plaintext_length = -1;
449
goto decrypt_end;
341
perror("incbuffer");
342
plaintext_length = -1;
343
goto decrypt_end;
450
344
}
451
345
452
346
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
457
351
break;
458
352
}
459
353
if(ret < 0){
460
perror_plus("gpgme_data_read");
354
perror("gpgme_data_read");
461
355
plaintext_length = -1;
462
356
goto decrypt_end;
463
357
}
465
359
}
466
360
467
361
if(debug){
468
fprintf_plus(stderr, "Decrypted password is: ");
362
fprintf(stderr, "Decrypted password is: ");
469
363
for(ssize_t i = 0; i < plaintext_length; i++){
470
364
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
471
365
}
482
376
return plaintext_length;
483
377
}
484
378
485
__attribute__((warn_unused_result))
486
static const char *safer_gnutls_strerror(int value){
487
const char *ret = gnutls_strerror(value);
379
static const char * safer_gnutls_strerror(int value){
380
const char *ret = gnutls_strerror(value); /* Spurious warning from
381
-Wunreachable-code */
488
382
if(ret == NULL)
489
383
ret = "(unknown)";
490
384
return ret;
491
385
}
492
386
493
387
/* GnuTLS log function callback */
494
__attribute__((nonnull))
495
388
static void debuggnutls(__attribute__((unused)) int level,
496
389
const char* string){
497
fprintf_plus(stderr, "GnuTLS: %s", string);
390
fprintf(stderr, "GnuTLS: %s", string);
498
391
}
499
392
500
__attribute__((nonnull, warn_unused_result))
501
393
static int init_gnutls_global(const char *pubkeyfilename,
502
const char *seckeyfilename,
503
mandos_context *mc){
394
const char *seckeyfilename){
504
395
int ret;
505
396
506
397
if(debug){
507
fprintf_plus(stderr, "Initializing GnuTLS\n");
398
fprintf(stderr, "Initializing GnuTLS\n");
508
399
}
509
400
510
401
ret = gnutls_global_init();
511
402
if(ret != GNUTLS_E_SUCCESS){
512
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
513
safer_gnutls_strerror(ret));
403
fprintf(stderr, "GnuTLS global_init: %s\n",
404
safer_gnutls_strerror(ret));
514
405
return -1;
515
406
}
516
407
523
414
}
524
415
525
416
/* OpenPGP credentials */
526
ret = gnutls_certificate_allocate_credentials(&mc->cred);
417
gnutls_certificate_allocate_credentials(&mc.cred);
527
418
if(ret != GNUTLS_E_SUCCESS){
528
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
529
safer_gnutls_strerror(ret));
419
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
420
from
421
-Wunreachable-code
422
*/
423
safer_gnutls_strerror(ret));
530
424
gnutls_global_deinit();
531
425
return -1;
532
426
}
533
427
534
428
if(debug){
535
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
536
" secret key %s as GnuTLS credentials\n",
537
pubkeyfilename,
538
seckeyfilename);
429
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
430
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
431
seckeyfilename);
539
432
}
540
433
541
434
ret = gnutls_certificate_set_openpgp_key_file
542
(mc->cred, pubkeyfilename, seckeyfilename,
435
(mc.cred, pubkeyfilename, seckeyfilename,
543
436
GNUTLS_OPENPGP_FMT_BASE64);
544
437
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr,
546
"Error[%d] while reading the OpenPGP key pair ('%s',"
547
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
548
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
549
safer_gnutls_strerror(ret));
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));
550
443
goto globalfail;
551
444
}
552
445
553
446
/* GnuTLS server initialization */
554
ret = gnutls_dh_params_init(&mc->dh_params);
447
ret = gnutls_dh_params_init(&mc.dh_params);
555
448
if(ret != GNUTLS_E_SUCCESS){
556
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
557
" initialization: %s\n",
558
safer_gnutls_strerror(ret));
449
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
450
" %s\n", safer_gnutls_strerror(ret));
559
451
goto globalfail;
560
452
}
561
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
453
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
562
454
if(ret != GNUTLS_E_SUCCESS){
563
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
564
safer_gnutls_strerror(ret));
455
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
456
safer_gnutls_strerror(ret));
565
457
goto globalfail;
566
458
}
567
459
568
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
460
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
569
461
570
462
return 0;
571
463
572
464
globalfail:
573
465
574
gnutls_certificate_free_credentials(mc->cred);
466
gnutls_certificate_free_credentials(mc.cred);
575
467
gnutls_global_deinit();
576
gnutls_dh_params_deinit(mc->dh_params);
468
gnutls_dh_params_deinit(mc.dh_params);
577
469
return -1;
578
470
}
579
471
580
__attribute__((nonnull, warn_unused_result))
581
static int init_gnutls_session(gnutls_session_t *session,
582
mandos_context *mc){
472
static int init_gnutls_session(gnutls_session_t *session){
583
473
int ret;
584
474
/* GnuTLS session creation */
585
do {
586
ret = gnutls_init(session, GNUTLS_SERVER);
587
if(quit_now){
588
return -1;
589
}
590
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
475
ret = gnutls_init(session, GNUTLS_SERVER);
591
476
if(ret != GNUTLS_E_SUCCESS){
592
fprintf_plus(stderr,
593
"Error in GnuTLS session initialization: %s\n",
594
safer_gnutls_strerror(ret));
477
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
478
safer_gnutls_strerror(ret));
595
479
}
596
480
597
481
{
598
482
const char *err;
599
do {
600
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
601
if(quit_now){
602
gnutls_deinit(*session);
603
return -1;
604
}
605
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
606
484
if(ret != GNUTLS_E_SUCCESS){
607
fprintf_plus(stderr, "Syntax error at: %s\n", err);
608
fprintf_plus(stderr, "GnuTLS error: %s\n",
609
safer_gnutls_strerror(ret));
485
fprintf(stderr, "Syntax error at: %s\n", err);
486
fprintf(stderr, "GnuTLS error: %s\n",
487
safer_gnutls_strerror(ret));
610
488
gnutls_deinit(*session);
611
489
return -1;
612
490
}
613
491
}
614
492
615
do {
616
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
617
mc->cred);
618
if(quit_now){
619
gnutls_deinit(*session);
620
return -1;
621
}
622
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
494
mc.cred);
623
495
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
625
safer_gnutls_strerror(ret));
496
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
497
safer_gnutls_strerror(ret));
626
498
gnutls_deinit(*session);
627
499
return -1;
628
500
}
629
501
630
502
/* ignore client certificate if any. */
631
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
503
gnutls_certificate_server_set_request(*session,
504
GNUTLS_CERT_IGNORE);
632
505
633
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
506
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
634
507
635
508
return 0;
636
509
}
640
513
__attribute__((unused)) const char *txt){}
641
514
642
515
/* Called when a Mandos server is found */
643
__attribute__((nonnull, warn_unused_result))
644
static int start_mandos_communication(const char *ip, in_port_t port,
516
static int start_mandos_communication(const char *ip, uint16_t port,
645
517
AvahiIfIndex if_index,
646
int af, mandos_context *mc){
647
int ret, tcp_sd = -1;
518
int af){
519
int ret, tcp_sd;
648
520
ssize_t sret;
649
struct sockaddr_storage to;
521
union {
522
struct sockaddr_in in;
523
struct sockaddr_in6 in6;
524
} to;
650
525
char *buffer = NULL;
651
char *decrypted_buffer = NULL;
526
char *decrypted_buffer;
652
527
size_t buffer_length = 0;
653
528
size_t buffer_capacity = 0;
529
ssize_t decrypted_buffer_size;
654
530
size_t written;
655
int retval = -1;
531
int retval = 0;
656
532
gnutls_session_t session;
657
533
int pf; /* Protocol family */
658
534
659
errno = 0;
660
661
if(quit_now){
662
errno = EINTR;
663
return -1;
664
}
665
666
535
switch(af){
667
536
case AF_INET6:
668
537
pf = PF_INET6;
671
540
pf = PF_INET;
672
541
break;
673
542
default:
674
fprintf_plus(stderr, "Bad address family: %d\n", af);
675
errno = EINVAL;
543
fprintf(stderr, "Bad address family: %d\n", af);
676
544
return -1;
677
545
}
678
546
679
/* If the interface is specified and we have a list of interfaces */
680
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
681
/* Check if the interface is one of the interfaces we are using */
682
bool match = false;
683
{
684
char *interface = NULL;
685
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
686
interface))){
687
if(if_nametoindex(interface) == (unsigned int)if_index){
688
match = true;
689
break;
690
}
691
}
692
}
693
if(not match){
694
/* This interface does not match any in the list, so we don't
695
connect to the server */
696
if(debug){
697
char interface[IF_NAMESIZE];
698
if(if_indextoname((unsigned int)if_index, interface) == NULL){
699
perror_plus("if_indextoname");
700
} else {
701
fprintf_plus(stderr, "Skipping server on non-used interface"
702
" \"%s\"\n",
703
if_indextoname((unsigned int)if_index,
704
interface));
705
}
706
}
707
return -1;
708
}
709
}
710
711
ret = init_gnutls_session(&session, mc);
547
ret = init_gnutls_session(&session);
712
548
if(ret != 0){
713
549
return -1;
714
550
}
715
551
716
552
if(debug){
717
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
718
PRIuMAX "\n", ip, (uintmax_t)port);
553
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
554
"\n", ip, port);
719
555
}
720
556
721
557
tcp_sd = socket(pf, SOCK_STREAM, 0);
722
558
if(tcp_sd < 0){
723
int e = errno;
724
perror_plus("socket");
725
errno = e;
726
goto mandos_end;
727
}
728
729
if(quit_now){
730
errno = EINTR;
731
goto mandos_end;
559
perror("socket");
560
return -1;
732
561
}
733
562
734
563
memset(&to, 0, sizeof(to));
735
564
if(af == AF_INET6){
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
565
to.in6.sin6_family = (uint16_t)af;
566
ret = inet_pton(af, ip, &to.in6.sin6_addr);
738
567
} else { /* IPv4 */
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
568
to.in.sin_family = (sa_family_t)af;
569
ret = inet_pton(af, ip, &to.in.sin_addr);
741
570
}
742
571
if(ret < 0 ){
743
int e = errno;
744
perror_plus("inet_pton");
745
errno = e;
746
goto mandos_end;
572
perror("inet_pton");
573
return -1;
747
574
}
748
575
if(ret == 0){
749
int e = errno;
750
fprintf_plus(stderr, "Bad address: %s\n", ip);
751
errno = e;
752
goto mandos_end;
576
fprintf(stderr, "Bad address: %s\n", ip);
577
return -1;
753
578
}
754
579
if(af == AF_INET6){
755
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
756
if(IN6_IS_ADDR_LINKLOCAL
757
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
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*/
758
587
if(if_index == AVAHI_IF_UNSPEC){
759
fprintf_plus(stderr, "An IPv6 link-local address is"
760
" incomplete without a network interface\n");
761
errno = EINVAL;
762
goto mandos_end;
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
589
" without a network interface\n");
590
return -1;
763
591
}
764
592
/* Set the network interface number as scope */
765
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
593
to.in6.sin6_scope_id = (uint32_t)if_index;
766
594
}
767
595
} else {
768
((struct sockaddr_in *)&to)->sin_port = htons(port);
769
}
770
771
if(quit_now){
772
errno = EINTR;
773
goto mandos_end;
596
to.in.sin_port = htons(port); /* Spurious warnings from
597
-Wconversion and
598
-Wunreachable-code */
774
599
}
775
600
776
601
if(debug){
777
602
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
778
603
char interface[IF_NAMESIZE];
779
604
if(if_indextoname((unsigned int)if_index, interface) == NULL){
780
perror_plus("if_indextoname");
605
perror("if_indextoname");
781
606
} else {
782
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
783
"\n", ip, interface, (uintmax_t)port);
607
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
608
ip, interface, port);
784
609
}
785
610
} else {
786
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
787
ip, (uintmax_t)port);
611
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
612
port);
788
613
}
789
614
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
790
615
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
616
const char *pcret;
791
617
if(af == AF_INET6){
792
ret = getnameinfo((struct sockaddr *)&to,
793
sizeof(struct sockaddr_in6),
794
addrstr, sizeof(addrstr), NULL, 0,
795
NI_NUMERICHOST);
796
} else {
797
ret = getnameinfo((struct sockaddr *)&to,
798
sizeof(struct sockaddr_in),
799
addrstr, sizeof(addrstr), NULL, 0,
800
NI_NUMERICHOST);
801
}
802
if(ret == EAI_SYSTEM){
803
perror_plus("getnameinfo");
804
} else if(ret != 0) {
805
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
806
} else if(strcmp(addrstr, ip) != 0){
807
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
808
}
809
}
810
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
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
}
814
631
}
815
632
816
633
if(af == AF_INET6){
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
634
ret = connect(tcp_sd, &to.in6, sizeof(to));
819
635
} else {
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
636
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
822
637
}
823
638
if(ret < 0){
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
int e = errno;
826
perror_plus("connect");
827
errno = e;
828
}
829
goto mandos_end;
830
}
831
832
if(quit_now){
833
errno = EINTR;
834
goto mandos_end;
639
perror("connect");
640
return -1;
835
641
}
836
642
837
643
const char *out = mandos_protocol_version;
839
645
while(true){
840
646
size_t out_size = strlen(out);
841
647
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
842
out_size - written));
648
out_size - written));
843
649
if(ret == -1){
844
int e = errno;
845
perror_plus("write");
846
errno = e;
650
perror("write");
651
retval = -1;
847
652
goto mandos_end;
848
653
}
849
654
written += (size_t)ret;
857
662
break;
858
663
}
859
664
}
860
861
if(quit_now){
862
errno = EINTR;
863
goto mandos_end;
864
}
865
665
}
866
666
867
667
if(debug){
868
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
869
}
870
871
if(quit_now){
872
errno = EINTR;
873
goto mandos_end;
874
}
875
876
/* This casting via intptr_t is to eliminate warning about casting
877
an int to a pointer type. This is exactly how the GnuTLS Guile
878
function "set-session-transport-fd!" does it. */
879
gnutls_transport_set_ptr(session,
880
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
881
882
if(quit_now){
883
errno = EINTR;
884
goto mandos_end;
885
}
886
887
do {
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{
888
674
ret = gnutls_handshake(session);
889
if(quit_now){
890
errno = EINTR;
891
goto mandos_end;
892
}
893
675
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
894
676
895
677
if(ret != GNUTLS_E_SUCCESS){
896
678
if(debug){
897
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
679
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
898
680
gnutls_perror(ret);
899
681
}
900
errno = EPROTO;
682
retval = -1;
901
683
goto mandos_end;
902
684
}
903
685
904
686
/* Read OpenPGP packet that contains the wanted password */
905
687
906
688
if(debug){
907
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
908
" %s\n", ip);
689
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
690
ip);
909
691
}
910
692
911
693
while(true){
912
913
if(quit_now){
914
errno = EINTR;
915
goto mandos_end;
916
}
917
918
694
buffer_capacity = incbuffer(&buffer, buffer_length,
919
buffer_capacity);
695
buffer_capacity);
920
696
if(buffer_capacity == 0){
921
int e = errno;
922
perror_plus("incbuffer");
923
errno = e;
924
goto mandos_end;
925
}
926
927
if(quit_now){
928
errno = EINTR;
697
perror("incbuffer");
698
retval = -1;
929
699
goto mandos_end;
930
700
}
931
701
940
710
case GNUTLS_E_AGAIN:
941
711
break;
942
712
case GNUTLS_E_REHANDSHAKE:
943
do {
713
do{
944
714
ret = gnutls_handshake(session);
945
946
if(quit_now){
947
errno = EINTR;
948
goto mandos_end;
949
}
950
715
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
951
716
if(ret < 0){
952
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
953
"***\n");
717
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
954
718
gnutls_perror(ret);
955
errno = EPROTO;
719
retval = -1;
956
720
goto mandos_end;
957
721
}
958
722
break;
959
723
default:
960
fprintf_plus(stderr, "Unknown error while reading data from"
961
" encrypted session with Mandos server\n");
724
fprintf(stderr, "Unknown error while reading data from"
725
" encrypted session with Mandos server\n");
726
retval = -1;
962
727
gnutls_bye(session, GNUTLS_SHUT_RDWR);
963
errno = EIO;
964
728
goto mandos_end;
965
729
}
966
730
} else {
969
733
}
970
734
971
735
if(debug){
972
fprintf_plus(stderr, "Closing TLS session\n");
973
}
974
975
if(quit_now){
976
errno = EINTR;
977
goto mandos_end;
978
}
979
980
do {
981
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
982
if(quit_now){
983
errno = EINTR;
984
goto mandos_end;
985
}
986
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
736
fprintf(stderr, "Closing TLS session\n");
737
}
738
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
987
740
988
741
if(buffer_length > 0){
989
ssize_t decrypted_buffer_size;
990
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
991
&decrypted_buffer, mc);
742
decrypted_buffer_size = pgp_packet_decrypt(buffer,
743
buffer_length,
744
&decrypted_buffer);
992
745
if(decrypted_buffer_size >= 0){
993
994
746
written = 0;
995
747
while(written < (size_t) decrypted_buffer_size){
996
if(quit_now){
997
errno = EINTR;
998
goto mandos_end;
999
}
1000
1001
748
ret = (int)fwrite(decrypted_buffer + written, 1,
1002
749
(size_t)decrypted_buffer_size - written,
1003
750
stdout);
1004
751
if(ret == 0 and ferror(stdout)){
1005
int e = errno;
1006
752
if(debug){
1007
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1008
strerror(errno));
753
fprintf(stderr, "Error writing encrypted data: %s\n",
754
strerror(errno));
1009
755
}
1010
errno = e;
1011
goto mandos_end;
756
retval = -1;
757
break;
1012
758
}
1013
759
written += (size_t)ret;
1014
760
}
1015
retval = 0;
761
free(decrypted_buffer);
762
} else {
763
retval = -1;
1016
764
}
765
} else {
766
retval = -1;
1017
767
}
1018
768
1019
769
/* Shutdown procedure */
1020
770
1021
771
mandos_end:
1022
{
1023
int e = errno;
1024
free(decrypted_buffer);
1025
free(buffer);
1026
if(tcp_sd >= 0){
1027
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1028
}
1029
if(ret == -1){
1030
if(e == 0){
1031
e = errno;
1032
}
1033
perror_plus("close");
1034
}
1035
gnutls_deinit(session);
1036
errno = e;
1037
if(quit_now){
1038
errno = EINTR;
1039
retval = -1;
1040
}
772
free(buffer);
773
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
774
if(ret == -1){
775
perror("close");
1041
776
}
777
gnutls_deinit(session);
1042
778
return retval;
1043
779
}
1044
780
1045
__attribute__((nonnull))
1046
781
static void resolve_callback(AvahiSServiceResolver *r,
1047
782
AvahiIfIndex interface,
1048
783
AvahiProtocol proto,
1056
791
AVAHI_GCC_UNUSED AvahiStringList *txt,
1057
792
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1058
793
flags,
1059
void *mc){
1060
if(r == NULL){
1061
return;
1062
}
794
AVAHI_GCC_UNUSED void* userdata){
795
assert(r);
1063
796
1064
797
/* Called whenever a service has been resolved successfully or
1065
798
timed out */
1066
799
1067
if(quit_now){
1068
return;
1069
}
1070
1071
800
switch(event){
1072
801
default:
1073
802
case AVAHI_RESOLVER_FAILURE:
1074
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1075
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1076
domain,
1077
avahi_strerror(avahi_server_errno
1078
(((mandos_context*)mc)->server)));
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)));
1079
806
break;
1080
807
1081
808
case AVAHI_RESOLVER_FOUND:
1083
810
char ip[AVAHI_ADDRESS_STR_MAX];
1084
811
avahi_address_snprint(ip, sizeof(ip), address);
1085
812
if(debug){
1086
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1087
PRIdMAX ") on port %" PRIu16 "\n", name,
1088
host_name, ip, (intmax_t)interface, port);
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);
1089
816
}
1090
int ret = start_mandos_communication(ip, (in_port_t)port,
1091
interface,
1092
avahi_proto_to_af(proto),
1093
mc);
817
int ret = start_mandos_communication(ip, port, interface,
818
avahi_proto_to_af(proto));
1094
819
if(ret == 0){
1095
avahi_simple_poll_quit(simple_poll);
1096
} else {
1097
if(not add_server(ip, (in_port_t)port, interface,
1098
avahi_proto_to_af(proto),
1099
&((mandos_context*)mc)->current_server)){
1100
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1101
" list\n", name);
1102
}
820
avahi_simple_poll_quit(mc.simple_poll);
1103
821
}
1104
822
}
1105
823
}
1115
833
const char *domain,
1116
834
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1117
835
flags,
1118
void *mc){
1119
if(b == NULL){
1120
return;
1121
}
836
AVAHI_GCC_UNUSED void* userdata){
837
assert(b);
1122
838
1123
839
/* Called whenever a new services becomes available on the LAN or
1124
840
is removed from the LAN */
1125
841
1126
if(quit_now){
1127
return;
1128
}
1129
1130
842
switch(event){
1131
843
default:
1132
844
case AVAHI_BROWSER_FAILURE:
1133
845
1134
fprintf_plus(stderr, "(Avahi browser) %s\n",
1135
avahi_strerror(avahi_server_errno
1136
(((mandos_context*)mc)->server)));
1137
avahi_simple_poll_quit(simple_poll);
846
fprintf(stderr, "(Avahi browser) %s\n",
847
avahi_strerror(avahi_server_errno(mc.server)));
848
avahi_simple_poll_quit(mc.simple_poll);
1138
849
return;
1139
850
1140
851
case AVAHI_BROWSER_NEW:
1143
854
the callback function is called the Avahi server will free the
1144
855
resolver for us. */
1145
856
1146
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1147
interface, protocol, name, type,
1148
domain, protocol, 0,
1149
resolve_callback, mc) == NULL)
1150
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1151
" %s\n", name,
1152
avahi_strerror(avahi_server_errno
1153
(((mandos_context*)mc)->server)));
857
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
858
name, type, domain, protocol, 0,
859
resolve_callback, NULL) == NULL)
860
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
861
name, avahi_strerror(avahi_server_errno(mc.server)));
1154
862
break;
1155
863
1156
864
case AVAHI_BROWSER_REMOVE:
1159
867
case AVAHI_BROWSER_ALL_FOR_NOW:
1160
868
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1161
869
if(debug){
1162
fprintf_plus(stderr, "No Mandos server found, still"
1163
" searching...\n");
870
fprintf(stderr, "No Mandos server found, still searching...\n");
1164
871
}
1165
872
break;
1166
873
}
1167
874
}
1168
875
1169
/* Signal handler that stops main loop after SIGTERM */
1170
static void handle_sigterm(int sig){
876
sig_atomic_t quit_now = 0;
877
878
/* stop main loop after sigterm has been called */
879
static void handle_sigterm(__attribute__((unused)) int sig){
1171
880
if(quit_now){
1172
881
return;
1173
882
}
1174
883
quit_now = 1;
1175
signal_received = sig;
1176
884
int old_errno = errno;
1177
/* set main loop to exit */
1178
if(simple_poll != NULL){
1179
avahi_simple_poll_quit(simple_poll);
1180
}
1181
errno = old_errno;
1182
}
1183
1184
__attribute__((nonnull, warn_unused_result))
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1186
int ret;
1187
error_t ret_errno;
1188
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1190
if(s < 0){
1191
ret_errno = errno;
1192
perror_plus("socket");
1193
errno = ret_errno;
1194
return false;
1195
}
1196
strcpy(ifr->ifr_name, ifname);
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1198
if(ret == -1){
1199
if(debug){
1200
ret_errno = errno;
1201
perror_plus("ioctl SIOCGIFFLAGS");
1202
errno = ret_errno;
1203
}
1204
return false;
1205
}
1206
return true;
1207
}
1208
1209
__attribute__((nonnull, warn_unused_result))
1210
bool good_flags(const char *ifname, const struct ifreq *ifr){
1211
1212
/* Reject the loopback device */
1213
if(ifr->ifr_flags & IFF_LOOPBACK){
1214
if(debug){
1215
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1216
ifname);
1217
}
1218
return false;
1219
}
1220
/* Accept point-to-point devices only if connect_to is specified */
1221
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1222
if(debug){
1223
fprintf_plus(stderr, "Accepting point-to-point interface"
1224
" \"%s\"\n", ifname);
1225
}
1226
return true;
1227
}
1228
/* Otherwise, reject non-broadcast-capable devices */
1229
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1230
if(debug){
1231
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1232
" \"%s\"\n", ifname);
1233
}
1234
return false;
1235
}
1236
/* Reject non-ARP interfaces (including dummy interfaces) */
1237
if(ifr->ifr_flags & IFF_NOARP){
1238
if(debug){
1239
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1240
ifname);
1241
}
1242
return false;
1243
}
1244
1245
/* Accept this device */
1246
if(debug){
1247
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1248
}
1249
return true;
1250
}
1251
1252
/*
1253
* This function determines if a directory entry in /sys/class/net
1254
* corresponds to an acceptable network device.
1255
* (This function is passed to scandir(3) as a filter function.)
1256
*/
1257
__attribute__((nonnull, warn_unused_result))
1258
int good_interface(const struct dirent *if_entry){
1259
if(if_entry->d_name[0] == '.'){
1260
return 0;
1261
}
1262
1263
struct ifreq ifr;
1264
if(not get_flags(if_entry->d_name, &ifr)){
1265
if(debug){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", if_entry->d_name);
1268
}
1269
return 0;
1270
}
1271
1272
if(not good_flags(if_entry->d_name, &ifr)){
1273
return 0;
1274
}
1275
return 1;
1276
}
1277
1278
/*
1279
* This function determines if a network interface is up.
1280
*/
1281
__attribute__((nonnull, warn_unused_result))
1282
bool interface_is_up(const char *interface){
1283
struct ifreq ifr;
1284
if(not get_flags(interface, &ifr)){
1285
if(debug){
1286
fprintf_plus(stderr, "Failed to get flags for interface "
1287
"\"%s\"\n", interface);
1288
}
1289
return false;
1290
}
1291
1292
return (bool)(ifr.ifr_flags & IFF_UP);
1293
}
1294
1295
/*
1296
* This function determines if a network interface is running
1297
*/
1298
__attribute__((nonnull, warn_unused_result))
1299
bool interface_is_running(const char *interface){
1300
struct ifreq ifr;
1301
if(not get_flags(interface, &ifr)){
1302
if(debug){
1303
fprintf_plus(stderr, "Failed to get flags for interface "
1304
"\"%s\"\n", interface);
1305
}
1306
return false;
1307
}
1308
1309
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1310
}
1311
1312
__attribute__((nonnull, pure, warn_unused_result))
1313
int notdotentries(const struct dirent *direntry){
1314
/* Skip "." and ".." */
1315
if(direntry->d_name[0] == '.'
1316
and (direntry->d_name[1] == '\0'
1317
or (direntry->d_name[1] == '.'
1318
and direntry->d_name[2] == '\0'))){
1319
return 0;
1320
}
1321
return 1;
1322
}
1323
1324
/* Is this directory entry a runnable program? */
1325
__attribute__((nonnull, warn_unused_result))
1326
int runnable_hook(const struct dirent *direntry){
1327
int ret;
1328
size_t sret;
1329
struct stat st;
1330
1331
if((direntry->d_name)[0] == '\0'){
1332
/* Empty name? */
1333
return 0;
1334
}
1335
1336
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1337
"abcdefghijklmnopqrstuvwxyz"
1338
"0123456789"
1339
"_.-");
1340
if((direntry->d_name)[sret] != '\0'){
1341
/* Contains non-allowed characters */
1342
if(debug){
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1344
direntry->d_name);
1345
}
1346
return 0;
1347
}
1348
1349
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1350
if(ret == -1){
1351
if(debug){
1352
perror_plus("Could not stat hook");
1353
}
1354
return 0;
1355
}
1356
if(not (S_ISREG(st.st_mode))){
1357
/* Not a regular file */
1358
if(debug){
1359
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1360
direntry->d_name);
1361
}
1362
return 0;
1363
}
1364
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1365
/* Not executable */
1366
if(debug){
1367
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1368
direntry->d_name);
1369
}
1370
return 0;
1371
}
1372
if(debug){
1373
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1374
direntry->d_name);
1375
}
1376
return 1;
1377
}
1378
1379
__attribute__((nonnull, warn_unused_result))
1380
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1381
mandos_context *mc){
1382
int ret;
1383
struct timespec now;
1384
struct timespec waited_time;
1385
intmax_t block_time;
1386
1387
while(true){
1388
if(mc->current_server == NULL){
1389
if(debug){
1390
fprintf_plus(stderr, "Wait until first server is found."
1391
" No timeout!\n");
1392
}
1393
ret = avahi_simple_poll_iterate(s, -1);
1394
} else {
1395
if(debug){
1396
fprintf_plus(stderr, "Check current_server if we should run"
1397
" it, or wait\n");
1398
}
1399
/* the current time */
1400
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1401
if(ret == -1){
1402
perror_plus("clock_gettime");
1403
return -1;
1404
}
1405
/* Calculating in ms how long time between now and server
1406
who we visted longest time ago. Now - last seen. */
1407
waited_time.tv_sec = (now.tv_sec
1408
- mc->current_server->last_seen.tv_sec);
1409
waited_time.tv_nsec = (now.tv_nsec
1410
- mc->current_server->last_seen.tv_nsec);
1411
/* total time is 10s/10,000ms.
1412
Converting to s from ms by dividing by 1,000,
1413
and ns to ms by dividing by 1,000,000. */
1414
block_time = ((retry_interval
1415
- ((intmax_t)waited_time.tv_sec * 1000))
1416
- ((intmax_t)waited_time.tv_nsec / 1000000));
1417
1418
if(debug){
1419
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1420
block_time);
1421
}
1422
1423
if(block_time <= 0){
1424
ret = start_mandos_communication(mc->current_server->ip,
1425
mc->current_server->port,
1426
mc->current_server->if_index,
1427
mc->current_server->af, mc);
1428
if(ret == 0){
1429
avahi_simple_poll_quit(s);
1430
return 0;
1431
}
1432
ret = clock_gettime(CLOCK_MONOTONIC,
1433
&mc->current_server->last_seen);
1434
if(ret == -1){
1435
perror_plus("clock_gettime");
1436
return -1;
1437
}
1438
mc->current_server = mc->current_server->next;
1439
block_time = 0; /* Call avahi to find new Mandos
1440
servers, but don't block */
1441
}
1442
1443
ret = avahi_simple_poll_iterate(s, (int)block_time);
1444
}
1445
if(ret != 0){
1446
if(ret > 0 or errno != EINTR){
1447
return (ret != 1) ? ret : 0;
1448
}
1449
}
1450
}
1451
}
1452
1453
/* Set effective uid to 0, return errno */
1454
__attribute__((warn_unused_result))
1455
error_t raise_privileges(void){
1456
error_t old_errno = errno;
1457
error_t ret_errno = 0;
1458
if(seteuid(0) == -1){
1459
ret_errno = errno;
1460
perror_plus("seteuid");
1461
}
1462
errno = old_errno;
1463
return ret_errno;
1464
}
1465
1466
/* Set effective and real user ID to 0. Return errno. */
1467
__attribute__((warn_unused_result))
1468
error_t raise_privileges_permanently(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = raise_privileges();
1471
if(ret_errno != 0){
1472
errno = old_errno;
1473
return ret_errno;
1474
}
1475
if(setuid(0) == -1){
1476
ret_errno = errno;
1477
perror_plus("seteuid");
1478
}
1479
errno = old_errno;
1480
return ret_errno;
1481
}
1482
1483
/* Set effective user ID to unprivileged saved user ID */
1484
__attribute__((warn_unused_result))
1485
error_t lower_privileges(void){
1486
error_t old_errno = errno;
1487
error_t ret_errno = 0;
1488
if(seteuid(uid) == -1){
1489
ret_errno = errno;
1490
perror_plus("seteuid");
1491
}
1492
errno = old_errno;
1493
return ret_errno;
1494
}
1495
1496
/* Lower privileges permanently */
1497
__attribute__((warn_unused_result))
1498
error_t lower_privileges_permanently(void){
1499
error_t old_errno = errno;
1500
error_t ret_errno = 0;
1501
if(setuid(uid) == -1){
1502
ret_errno = errno;
1503
perror_plus("setuid");
1504
}
1505
errno = old_errno;
1506
return ret_errno;
1507
}
1508
1509
#ifndef O_CLOEXEC
1510
/*
1511
* Based on the example in the GNU LibC manual chapter 13.13 "File
1512
* Descriptor Flags".
1513
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1514
*/
1515
__attribute__((warn_unused_result))
1516
static int set_cloexec_flag(int fd){
1517
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1518
/* If reading the flags failed, return error indication now. */
1519
if(ret < 0){
1520
return ret;
1521
}
1522
/* Store modified flag word in the descriptor. */
1523
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1524
ret | FD_CLOEXEC));
1525
}
1526
#endif /* not O_CLOEXEC */
1527
1528
__attribute__((nonnull))
1529
void run_network_hooks(const char *mode, const char *interface,
1530
const float delay){
1531
struct dirent **direntries;
1532
if(hookdir_fd == -1){
1533
hookdir_fd = open(hookdir, O_RDONLY |
1534
#ifdef O_CLOEXEC
1535
O_CLOEXEC
1536
#else /* not O_CLOEXEC */
1537
0
1538
#endif /* not O_CLOEXEC */
1539
);
1540
if(hookdir_fd == -1){
1541
if(errno == ENOENT){
1542
if(debug){
1543
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1544
" found\n", hookdir);
1545
}
1546
} else {
1547
perror_plus("open");
1548
}
1549
return;
1550
}
1551
#ifndef O_CLOEXEC
1552
if(set_cloexec_flag(hookdir_fd) < 0){
1553
perror_plus("set_cloexec_flag");
1554
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1555
perror_plus("close");
1556
} else {
1557
hookdir_fd = -1;
1558
}
1559
return;
1560
}
1561
#endif /* not O_CLOEXEC */
1562
}
1563
#ifdef __GLIBC__
1564
#if __GLIBC_PREREQ(2, 15)
1565
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1566
runnable_hook, alphasort);
1567
#else /* not __GLIBC_PREREQ(2, 15) */
1568
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1569
alphasort);
1570
#endif /* not __GLIBC_PREREQ(2, 15) */
1571
#else /* not __GLIBC__ */
1572
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1573
alphasort);
1574
#endif /* not __GLIBC__ */
1575
if(numhooks == -1){
1576
perror_plus("scandir");
1577
return;
1578
}
1579
struct dirent *direntry;
1580
int ret;
1581
int devnull = open("/dev/null", O_RDONLY);
1582
for(int i = 0; i < numhooks; i++){
1583
direntry = direntries[i];
1584
if(debug){
1585
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1586
direntry->d_name);
1587
}
1588
pid_t hook_pid = fork();
1589
if(hook_pid == 0){
1590
/* Child */
1591
/* Raise privileges */
1592
if(raise_privileges_permanently() != 0){
1593
perror_plus("Failed to raise privileges");
1594
_exit(EX_NOPERM);
1595
}
1596
/* Set group */
1597
errno = 0;
1598
ret = setgid(0);
1599
if(ret == -1){
1600
perror_plus("setgid");
1601
_exit(EX_NOPERM);
1602
}
1603
/* Reset supplementary groups */
1604
errno = 0;
1605
ret = setgroups(0, NULL);
1606
if(ret == -1){
1607
perror_plus("setgroups");
1608
_exit(EX_NOPERM);
1609
}
1610
ret = dup2(devnull, STDIN_FILENO);
1611
if(ret == -1){
1612
perror_plus("dup2(devnull, STDIN_FILENO)");
1613
_exit(EX_OSERR);
1614
}
1615
ret = close(devnull);
1616
if(ret == -1){
1617
perror_plus("close");
1618
_exit(EX_OSERR);
1619
}
1620
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1621
if(ret == -1){
1622
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1623
_exit(EX_OSERR);
1624
}
1625
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1626
if(ret == -1){
1627
perror_plus("setenv");
1628
_exit(EX_OSERR);
1629
}
1630
ret = setenv("DEVICE", interface, 1);
1631
if(ret == -1){
1632
perror_plus("setenv");
1633
_exit(EX_OSERR);
1634
}
1635
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1636
if(ret == -1){
1637
perror_plus("setenv");
1638
_exit(EX_OSERR);
1639
}
1640
ret = setenv("MODE", mode, 1);
1641
if(ret == -1){
1642
perror_plus("setenv");
1643
_exit(EX_OSERR);
1644
}
1645
char *delaystring;
1646
ret = asprintf(&delaystring, "%f", (double)delay);
1647
if(ret == -1){
1648
perror_plus("asprintf");
1649
_exit(EX_OSERR);
1650
}
1651
ret = setenv("DELAY", delaystring, 1);
1652
if(ret == -1){
1653
free(delaystring);
1654
perror_plus("setenv");
1655
_exit(EX_OSERR);
1656
}
1657
free(delaystring);
1658
if(connect_to != NULL){
1659
ret = setenv("CONNECT", connect_to, 1);
1660
if(ret == -1){
1661
perror_plus("setenv");
1662
_exit(EX_OSERR);
1663
}
1664
}
1665
if(fexecve(hookdir_fd, (char *const [])
1666
{ direntry->d_name, NULL }, environ) == -1){
1667
perror_plus("fexecve");
1668
_exit(EXIT_FAILURE);
1669
}
1670
} else {
1671
int status;
1672
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1673
perror_plus("waitpid");
1674
continue;
1675
}
1676
if(WIFEXITED(status)){
1677
if(WEXITSTATUS(status) != 0){
1678
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1679
" with status %d\n", direntry->d_name,
1680
WEXITSTATUS(status));
1681
continue;
1682
}
1683
} else if(WIFSIGNALED(status)){
1684
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1685
" signal %d\n", direntry->d_name,
1686
WTERMSIG(status));
1687
continue;
1688
} else {
1689
fprintf_plus(stderr, "Warning: network hook \"%s\""
1690
" crashed\n", direntry->d_name);
1691
continue;
1692
}
1693
}
1694
if(debug){
1695
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1696
direntry->d_name);
1697
}
1698
}
1699
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1700
perror_plus("close");
1701
} else {
1702
hookdir_fd = -1;
1703
}
1704
close(devnull);
1705
}
1706
1707
__attribute__((nonnull, warn_unused_result))
1708
error_t bring_up_interface(const char *const interface,
1709
const float delay){
1710
error_t old_errno = errno;
1711
int ret;
1712
struct ifreq network;
1713
unsigned int if_index = if_nametoindex(interface);
1714
if(if_index == 0){
1715
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1716
errno = old_errno;
1717
return ENXIO;
1718
}
1719
1720
if(quit_now){
1721
errno = old_errno;
1722
return EINTR;
1723
}
1724
1725
if(not interface_is_up(interface)){
1726
error_t ret_errno = 0, ioctl_errno = 0;
1727
if(not get_flags(interface, &network)){
1728
ret_errno = errno;
1729
fprintf_plus(stderr, "Failed to get flags for interface "
1730
"\"%s\"\n", interface);
1731
errno = old_errno;
1732
return ret_errno;
1733
}
1734
network.ifr_flags |= IFF_UP; /* set flag */
1735
1736
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1737
if(sd == -1){
1738
ret_errno = errno;
1739
perror_plus("socket");
1740
errno = old_errno;
1741
return ret_errno;
1742
}
1743
1744
if(quit_now){
1745
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1746
if(ret == -1){
1747
perror_plus("close");
1748
}
1749
errno = old_errno;
1750
return EINTR;
1751
}
1752
1753
if(debug){
1754
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1755
interface);
1756
}
1757
1758
/* Raise privileges */
1759
ret_errno = raise_privileges();
1760
if(ret_errno != 0){
1761
perror_plus("Failed to raise privileges");
1762
}
1763
1764
#ifdef __linux__
1765
int ret_linux;
1766
bool restore_loglevel = false;
1767
if(ret_errno == 0){
1768
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1769
messages about the network interface to mess up the prompt */
1770
ret_linux = klogctl(8, NULL, 5);
1771
if(ret_linux == -1){
1772
perror_plus("klogctl");
1773
} else {
1774
restore_loglevel = true;
1775
}
1776
}
1777
#endif /* __linux__ */
1778
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1779
ioctl_errno = errno;
1780
#ifdef __linux__
1781
if(restore_loglevel){
1782
ret_linux = klogctl(7, NULL, 0);
1783
if(ret_linux == -1){
1784
perror_plus("klogctl");
1785
}
1786
}
1787
#endif /* __linux__ */
1788
1789
/* If raise_privileges() succeeded above */
1790
if(ret_errno == 0){
1791
/* Lower privileges */
1792
ret_errno = lower_privileges();
1793
if(ret_errno != 0){
1794
errno = ret_errno;
1795
perror_plus("Failed to lower privileges");
1796
}
1797
}
1798
1799
/* Close the socket */
1800
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1801
if(ret == -1){
1802
perror_plus("close");
1803
}
1804
1805
if(ret_setflags == -1){
1806
errno = ioctl_errno;
1807
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1808
errno = old_errno;
1809
return ioctl_errno;
1810
}
1811
} else if(debug){
1812
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1813
interface);
1814
}
1815
1816
/* Sleep checking until interface is running.
1817
Check every 0.25s, up to total time of delay */
1818
for(int i=0; i < delay * 4; i++){
1819
if(interface_is_running(interface)){
1820
break;
1821
}
1822
struct timespec sleeptime = { .tv_nsec = 250000000 };
1823
ret = nanosleep(&sleeptime, NULL);
1824
if(ret == -1 and errno != EINTR){
1825
perror_plus("nanosleep");
1826
}
1827
}
1828
1829
errno = old_errno;
1830
return 0;
1831
}
1832
1833
__attribute__((nonnull, warn_unused_result))
1834
error_t take_down_interface(const char *const interface){
1835
error_t old_errno = errno;
1836
struct ifreq network;
1837
unsigned int if_index = if_nametoindex(interface);
1838
if(if_index == 0){
1839
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1840
errno = old_errno;
1841
return ENXIO;
1842
}
1843
if(interface_is_up(interface)){
1844
error_t ret_errno = 0, ioctl_errno = 0;
1845
if(not get_flags(interface, &network) and debug){
1846
ret_errno = errno;
1847
fprintf_plus(stderr, "Failed to get flags for interface "
1848
"\"%s\"\n", interface);
1849
errno = old_errno;
1850
return ret_errno;
1851
}
1852
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1853
1854
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1855
if(sd == -1){
1856
ret_errno = errno;
1857
perror_plus("socket");
1858
errno = old_errno;
1859
return ret_errno;
1860
}
1861
1862
if(debug){
1863
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1864
interface);
1865
}
1866
1867
/* Raise privileges */
1868
ret_errno = raise_privileges();
1869
if(ret_errno != 0){
1870
perror_plus("Failed to raise privileges");
1871
}
1872
1873
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1874
ioctl_errno = errno;
1875
1876
/* If raise_privileges() succeeded above */
1877
if(ret_errno == 0){
1878
/* Lower privileges */
1879
ret_errno = lower_privileges();
1880
if(ret_errno != 0){
1881
errno = ret_errno;
1882
perror_plus("Failed to lower privileges");
1883
}
1884
}
1885
1886
/* Close the socket */
1887
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1888
if(ret == -1){
1889
perror_plus("close");
1890
}
1891
1892
if(ret_setflags == -1){
1893
errno = ioctl_errno;
1894
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1895
errno = old_errno;
1896
return ioctl_errno;
1897
}
1898
} else if(debug){
1899
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1900
interface);
1901
}
1902
1903
errno = old_errno;
1904
return 0;
885
if(mc.simple_poll != NULL){
886
avahi_simple_poll_quit(mc.simple_poll);
887
}
888
errno = old_errno;
1905
889
}
1906
890
1907
891
int main(int argc, char *argv[]){
1908
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1909
.priority = "SECURE256:!CTYPE-X.509:"
1910
"+CTYPE-OPENPGP", .current_server = NULL,
1911
.interfaces = NULL, .interfaces_size = 0 };
1912
892
AvahiSServiceBrowser *sb = NULL;
1913
error_t ret_errno;
893
int error;
1914
894
int ret;
1915
895
intmax_t tmpmax;
1916
896
char *tmp;
1917
897
int exitcode = EXIT_SUCCESS;
1918
char *interfaces_to_take_down = NULL;
1919
size_t interfaces_to_take_down_size = 0;
1920
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1921
char old_tempdir[] = "/tmp/mandosXXXXXX";
1922
char *tempdir = NULL;
898
const char *interface = "eth0";
899
struct ifreq network;
900
int sd;
901
uid_t uid;
902
gid_t gid;
903
char *connect_to = NULL;
904
char tempdir[] = "/tmp/mandosXXXXXX";
905
bool tempdir_created = false;
1923
906
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1924
907
const char *seckey = PATHDIR "/" SECKEY;
1925
908
const char *pubkey = PATHDIR "/" PUBKEY;
1926
char *interfaces_hooks = NULL;
1927
909
1928
910
bool gnutls_initialized = false;
1929
911
bool gpgme_initialized = false;
1930
912
float delay = 2.5f;
1931
double retry_interval = 10; /* 10s between trying a server and
1932
retrying the same server again */
1933
913
1934
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
914
struct sigaction old_sigterm_action;
1935
915
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1936
916
1937
uid = getuid();
1938
gid = getgid();
1939
1940
/* Lower any group privileges we might have, just to be safe */
1941
errno = 0;
1942
ret = setgid(gid);
1943
if(ret == -1){
1944
perror_plus("setgid");
1945
}
1946
1947
/* Lower user privileges (temporarily) */
1948
errno = 0;
1949
ret = seteuid(uid);
1950
if(ret == -1){
1951
perror_plus("seteuid");
1952
}
1953
1954
if(quit_now){
1955
goto end;
1956
}
1957
1958
917
{
1959
918
struct argp_option options[] = {
1960
919
{ .name = "debug", .key = 128,
1989
948
.arg = "SECONDS",
1990
949
.doc = "Maximum delay to wait for interface startup",
1991
950
.group = 2 },
1992
{ .name = "retry", .key = 132,
1993
.arg = "SECONDS",
1994
.doc = "Retry interval used when denied by the Mandos server",
1995
.group = 2 },
1996
{ .name = "network-hook-dir", .key = 133,
1997
.arg = "DIR",
1998
.doc = "Directory where network hooks are located",
1999
.group = 2 },
2000
/*
2001
* These reproduce what we would get without ARGP_NO_HELP
2002
*/
2003
{ .name = "help", .key = '?',
2004
.doc = "Give this help list", .group = -1 },
2005
{ .name = "usage", .key = -3,
2006
.doc = "Give a short usage message", .group = -1 },
2007
{ .name = "version", .key = 'V',
2008
.doc = "Print program version", .group = -1 },
2009
951
{ .name = NULL }
2010
952
};
2011
953
2012
954
error_t parse_opt(int key, char *arg,
2013
955
struct argp_state *state){
2014
errno = 0;
2015
956
switch(key){
2016
957
case 128: /* --debug */
2017
958
debug = true;
2020
961
connect_to = arg;
2021
962
break;
2022
963
case 'i': /* --interface */
2023
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2024
arg, (int)',');
2025
if(ret_errno != 0){
2026
argp_error(state, "%s", strerror(ret_errno));
2027
}
964
interface = arg;
2028
965
break;
2029
966
case 's': /* --seckey */
2030
967
seckey = arg;
2037
974
tmpmax = strtoimax(arg, &tmp, 10);
2038
975
if(errno != 0 or tmp == arg or *tmp != '\0'
2039
976
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2040
argp_error(state, "Bad number of DH bits");
977
fprintf(stderr, "Bad number of DH bits\n");
978
exit(EXIT_FAILURE);
2041
979
}
2042
980
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2043
981
break;
2048
986
errno = 0;
2049
987
delay = strtof(arg, &tmp);
2050
988
if(errno != 0 or tmp == arg or *tmp != '\0'){
2051
argp_error(state, "Bad delay");
2052
}
2053
case 132: /* --retry */
2054
errno = 0;
2055
retry_interval = strtod(arg, &tmp);
2056
if(errno != 0 or tmp == arg or *tmp != '\0'
2057
or (retry_interval * 1000) > INT_MAX
2058
or retry_interval < 0){
2059
argp_error(state, "Bad retry interval");
2060
}
2061
break;
2062
case 133: /* --network-hook-dir */
2063
hookdir = arg;
2064
break;
2065
/*
2066
* These reproduce what we would get without ARGP_NO_HELP
2067
*/
2068
case '?': /* --help */
2069
argp_state_help(state, state->out_stream,
2070
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2071
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2072
case -3: /* --usage */
2073
argp_state_help(state, state->out_stream,
2074
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2075
case 'V': /* --version */
2076
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2077
exit(argp_err_exit_status);
989
fprintf(stderr, "Bad delay\n");
990
exit(EXIT_FAILURE);
991
}
992
break;
993
case ARGP_KEY_ARG:
994
argp_usage(state);
995
case ARGP_KEY_END:
2078
996
break;
2079
997
default:
2080
998
return ARGP_ERR_UNKNOWN;
2081
999
}
2082
return errno;
1000
return 0;
2083
1001
}
2084
1002
2085
1003
struct argp argp = { .options = options, .parser = parse_opt,
2086
1004
.args_doc = "",
2087
1005
.doc = "Mandos client -- Get and decrypt"
2088
1006
" passwords from a Mandos server" };
2089
ret = argp_parse(&argp, argc, argv,
2090
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2091
switch(ret){
2092
case 0:
2093
break;
2094
case ENOMEM:
2095
default:
2096
errno = ret;
2097
perror_plus("argp_parse");
2098
exitcode = EX_OSERR;
2099
goto end;
2100
case EINVAL:
2101
exitcode = EX_USAGE;
2102
goto end;
2103
}
2104
}
2105
2106
{
2107
/* Work around Debian bug #633582:
2108
<http://bugs.debian.org/633582> */
2109
2110
/* Re-raise privileges */
2111
ret_errno = raise_privileges();
2112
if(ret_errno != 0){
2113
errno = ret_errno;
2114
perror_plus("Failed to raise privileges");
2115
} else {
2116
struct stat st;
2117
2118
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2119
int seckey_fd = open(seckey, O_RDONLY);
2120
if(seckey_fd == -1){
2121
perror_plus("open");
2122
} else {
2123
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2124
if(ret == -1){
2125
perror_plus("fstat");
2126
} else {
2127
if(S_ISREG(st.st_mode)
2128
and st.st_uid == 0 and st.st_gid == 0){
2129
ret = fchown(seckey_fd, uid, gid);
2130
if(ret == -1){
2131
perror_plus("fchown");
2132
}
2133
}
2134
}
2135
TEMP_FAILURE_RETRY(close(seckey_fd));
2136
}
2137
}
2138
2139
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2140
int pubkey_fd = open(pubkey, O_RDONLY);
2141
if(pubkey_fd == -1){
2142
perror_plus("open");
2143
} else {
2144
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2145
if(ret == -1){
2146
perror_plus("fstat");
2147
} else {
2148
if(S_ISREG(st.st_mode)
2149
and st.st_uid == 0 and st.st_gid == 0){
2150
ret = fchown(pubkey_fd, uid, gid);
2151
if(ret == -1){
2152
perror_plus("fchown");
2153
}
2154
}
2155
}
2156
TEMP_FAILURE_RETRY(close(pubkey_fd));
2157
}
2158
}
2159
2160
/* Lower privileges */
2161
ret_errno = lower_privileges();
2162
if(ret_errno != 0){
2163
errno = ret_errno;
2164
perror_plus("Failed to lower privileges");
2165
}
2166
}
2167
}
2168
2169
/* Remove invalid interface names (except "none") */
2170
{
2171
char *interface = NULL;
2172
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2173
interface))){
2174
if(strcmp(interface, "none") != 0
2175
and if_nametoindex(interface) == 0){
2176
if(interface[0] != '\0'){
2177
fprintf_plus(stderr, "Not using nonexisting interface"
2178
" \"%s\"\n", interface);
2179
}
2180
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2181
interface = NULL;
2182
}
2183
}
2184
}
2185
2186
/* Run network hooks */
2187
{
2188
if(mc.interfaces != NULL){
2189
interfaces_hooks = malloc(mc.interfaces_size);
2190
if(interfaces_hooks == NULL){
2191
perror_plus("malloc");
2192
goto end;
2193
}
2194
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2195
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2196
}
2197
run_network_hooks("start", interfaces_hooks != NULL ?
2198
interfaces_hooks : "", delay);
1007
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1008
if(ret == ARGP_ERR_UNKNOWN){
1009
fprintf(stderr, "Unknown error while parsing arguments\n");
1010
exitcode = EXIT_FAILURE;
1011
goto end;
1012
}
2199
1013
}
2200
1014
2201
1015
if(not debug){
2206
1020
from the signal handler */
2207
1021
/* Initialize the pseudo-RNG for Avahi */
2208
1022
srand((unsigned int) time(NULL));
2209
simple_poll = avahi_simple_poll_new();
2210
if(simple_poll == NULL){
2211
fprintf_plus(stderr,
2212
"Avahi: Failed to create simple poll object.\n");
2213
exitcode = EX_UNAVAILABLE;
1023
mc.simple_poll = avahi_simple_poll_new();
1024
if(mc.simple_poll == NULL){
1025
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1026
exitcode = EXIT_FAILURE;
2214
1027
goto end;
2215
1028
}
2216
1029
2217
1030
sigemptyset(&sigterm_action.sa_mask);
2218
1031
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2219
1032
if(ret == -1){
2220
perror_plus("sigaddset");
2221
exitcode = EX_OSERR;
1033
perror("sigaddset");
1034
exitcode = EXIT_FAILURE;
2222
1035
goto end;
2223
1036
}
2224
1037
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2225
1038
if(ret == -1){
2226
perror_plus("sigaddset");
2227
exitcode = EX_OSERR;
1039
perror("sigaddset");
1040
exitcode = EXIT_FAILURE;
2228
1041
goto end;
2229
1042
}
2230
1043
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2231
1044
if(ret == -1){
2232
perror_plus("sigaddset");
2233
exitcode = EX_OSERR;
2234
goto end;
2235
}
2236
/* Need to check if the handler is SIG_IGN before handling:
2237
| [[info:libc:Initial Signal Actions]] |
2238
| [[info:libc:Basic Signal Handling]] |
2239
*/
2240
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2241
if(ret == -1){
2242
perror_plus("sigaction");
2243
return EX_OSERR;
2244
}
2245
if(old_sigterm_action.sa_handler != SIG_IGN){
2246
ret = sigaction(SIGINT, &sigterm_action, NULL);
2247
if(ret == -1){
2248
perror_plus("sigaction");
2249
exitcode = EX_OSERR;
2250
goto end;
2251
}
2252
}
2253
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2254
if(ret == -1){
2255
perror_plus("sigaction");
2256
return EX_OSERR;
2257
}
2258
if(old_sigterm_action.sa_handler != SIG_IGN){
2259
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2260
if(ret == -1){
2261
perror_plus("sigaction");
2262
exitcode = EX_OSERR;
2263
goto end;
2264
}
2265
}
2266
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2267
if(ret == -1){
2268
perror_plus("sigaction");
2269
return EX_OSERR;
2270
}
2271
if(old_sigterm_action.sa_handler != SIG_IGN){
2272
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2273
if(ret == -1){
2274
perror_plus("sigaction");
2275
exitcode = EX_OSERR;
2276
goto end;
2277
}
2278
}
2279
2280
/* If no interfaces were specified, make a list */
2281
if(mc.interfaces == NULL){
2282
struct dirent **direntries;
2283
/* Look for any good interfaces */
2284
ret = scandir(sys_class_net, &direntries, good_interface,
2285
alphasort);
2286
if(ret >= 1){
2287
/* Add all found interfaces to interfaces list */
2288
for(int i = 0; i < ret; ++i){
2289
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2290
direntries[i]->d_name);
2291
if(ret_errno != 0){
2292
errno = ret_errno;
2293
perror_plus("argz_add");
2294
continue;
2295
}
2296
if(debug){
2297
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2298
direntries[i]->d_name);
2299
}
2300
}
2301
free(direntries);
2302
} else {
2303
free(direntries);
2304
fprintf_plus(stderr, "Could not find a network interface\n");
2305
exitcode = EXIT_FAILURE;
2306
goto end;
2307
}
2308
}
2309
2310
/* Bring up interfaces which are down, and remove any "none"s */
2311
{
2312
char *interface = NULL;
2313
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2314
interface))){
2315
/* If interface name is "none", stop bringing up interfaces.
2316
Also remove all instances of "none" from the list */
2317
if(strcmp(interface, "none") == 0){
2318
argz_delete(&mc.interfaces, &mc.interfaces_size,
2319
interface);
2320
interface = NULL;
2321
while((interface = argz_next(mc.interfaces,
2322
mc.interfaces_size, interface))){
2323
if(strcmp(interface, "none") == 0){
2324
argz_delete(&mc.interfaces, &mc.interfaces_size,
2325
interface);
2326
interface = NULL;
1045
perror("sigaddset");
1046
exitcode = EXIT_FAILURE;
1047
goto end;
1048
}
1049
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1050
if(ret == -1){
1051
perror("sigaction");
1052
exitcode = EXIT_FAILURE;
1053
goto end;
1054
}
1055
1056
/* If the interface is down, bring it up */
1057
if(interface[0] != '\0'){
1058
#ifdef __linux__
1059
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1060
messages to mess up the prompt */
1061
ret = klogctl(8, NULL, 5);
1062
bool restore_loglevel = true;
1063
if(ret == -1){
1064
restore_loglevel = false;
1065
perror("klogctl");
1066
}
1067
#endif /* __linux__ */
1068
1069
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1070
if(sd < 0){
1071
perror("socket");
1072
exitcode = EXIT_FAILURE;
1073
#ifdef __linux__
1074
if(restore_loglevel){
1075
ret = klogctl(7, NULL, 0);
1076
if(ret == -1){
1077
perror("klogctl");
1078
}
1079
}
1080
#endif /* __linux__ */
1081
goto end;
1082
}
1083
strcpy(network.ifr_name, interface);
1084
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1085
if(ret == -1){
1086
perror("ioctl SIOCGIFFLAGS");
1087
#ifdef __linux__
1088
if(restore_loglevel){
1089
ret = klogctl(7, NULL, 0);
1090
if(ret == -1){
1091
perror("klogctl");
1092
}
1093
}
1094
#endif /* __linux__ */
1095
exitcode = EXIT_FAILURE;
1096
goto end;
1097
}
1098
if((network.ifr_flags & IFF_UP) == 0){
1099
network.ifr_flags |= IFF_UP;
1100
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1101
if(ret == -1){
1102
perror("ioctl SIOCSIFFLAGS");
1103
exitcode = EXIT_FAILURE;
1104
#ifdef __linux__
1105
if(restore_loglevel){
1106
ret = klogctl(7, NULL, 0);
1107
if(ret == -1){
1108
perror("klogctl");
2327
1109
}
2328
1110
}
1111
#endif /* __linux__ */
1112
goto end;
1113
}
1114
}
1115
/* sleep checking until interface is running */
1116
for(int i=0; i < delay * 4; i++){
1117
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1118
if(ret == -1){
1119
perror("ioctl SIOCGIFFLAGS");
1120
} else if(network.ifr_flags & IFF_RUNNING){
2329
1121
break;
2330
1122
}
2331
bool interface_was_up = interface_is_up(interface);
2332
errno = bring_up_interface(interface, delay);
2333
if(not interface_was_up){
2334
if(errno != 0){
2335
perror_plus("Failed to bring up interface");
2336
} else {
2337
errno = argz_add(&interfaces_to_take_down,
2338
&interfaces_to_take_down_size,
2339
interface);
2340
if(errno != 0){
2341
perror_plus("argz_add");
2342
}
2343
}
2344
}
2345
}
2346
if(debug and (interfaces_to_take_down == NULL)){
2347
fprintf_plus(stderr, "No interfaces were brought up\n");
2348
}
2349
}
2350
2351
/* If we only got one interface, explicitly use only that one */
2352
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2353
if(debug){
2354
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2355
mc.interfaces);
2356
}
2357
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2358
}
2359
2360
if(quit_now){
2361
goto end;
2362
}
2363
2364
ret = init_gnutls_global(pubkey, seckey, &mc);
2365
if(ret == -1){
2366
fprintf_plus(stderr, "init_gnutls_global failed\n");
2367
exitcode = EX_UNAVAILABLE;
1123
struct timespec sleeptime = { .tv_nsec = 250000000 };
1124
ret = nanosleep(&sleeptime, NULL);
1125
if(ret == -1 and errno != EINTR){
1126
perror("nanosleep");
1127
}
1128
}
1129
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1130
if(ret == -1){
1131
perror("close");
1132
}
1133
#ifdef __linux__
1134
if(restore_loglevel){
1135
/* Restores kernel loglevel to default */
1136
ret = klogctl(7, NULL, 0);
1137
if(ret == -1){
1138
perror("klogctl");
1139
}
1140
}
1141
#endif /* __linux__ */
1142
}
1143
1144
uid = getuid();
1145
gid = getgid();
1146
1147
errno = 0;
1148
setgid(gid);
1149
if(ret == -1){
1150
perror("setgid");
1151
}
1152
1153
ret = setuid(uid);
1154
if(ret == -1){
1155
perror("setuid");
1156
}
1157
1158
ret = init_gnutls_global(pubkey, seckey);
1159
if(ret == -1){
1160
fprintf(stderr, "init_gnutls_global failed\n");
1161
exitcode = EXIT_FAILURE;
2368
1162
goto end;
2369
1163
} else {
2370
1164
gnutls_initialized = true;
2371
1165
}
2372
1166
2373
if(quit_now){
2374
goto end;
2375
}
2376
2377
/* Try /run/tmp before /tmp */
2378
tempdir = mkdtemp(run_tempdir);
2379
if(tempdir == NULL and errno == ENOENT){
2380
if(debug){
2381
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2382
run_tempdir, old_tempdir);
2383
}
2384
tempdir = mkdtemp(old_tempdir);
2385
}
2386
if(tempdir == NULL){
2387
perror_plus("mkdtemp");
2388
goto end;
2389
}
2390
2391
if(quit_now){
2392
goto end;
2393
}
2394
2395
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2396
fprintf_plus(stderr, "init_gpgme failed\n");
2397
exitcode = EX_UNAVAILABLE;
1167
if(mkdtemp(tempdir) == NULL){
1168
perror("mkdtemp");
1169
goto end;
1170
}
1171
tempdir_created = true;
1172
1173
if(not init_gpgme(pubkey, seckey, tempdir)){
1174
fprintf(stderr, "init_gpgme failed\n");
1175
exitcode = EXIT_FAILURE;
2398
1176
goto end;
2399
1177
} else {
2400
1178
gpgme_initialized = true;
2401
1179
}
2402
1180
2403
if(quit_now){
2404
goto end;
1181
if(interface[0] != '\0'){
1182
if_index = (AvahiIfIndex) if_nametoindex(interface);
1183
if(if_index == 0){
1184
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1185
exitcode = EXIT_FAILURE;
1186
goto end;
1187
}
2405
1188
}
2406
1189
2407
1190
if(connect_to != NULL){
2408
1191
/* Connect directly, do not use Zeroconf */
2409
1192
/* (Mainly meant for debugging) */
2410
1193
char *address = strrchr(connect_to, ':');
2411
2412
1194
if(address == NULL){
2413
fprintf_plus(stderr, "No colon in address\n");
2414
exitcode = EX_USAGE;
2415
goto end;
2416
}
2417
2418
if(quit_now){
2419
goto end;
2420
}
2421
2422
in_port_t port;
1195
fprintf(stderr, "No colon in address\n");
1196
exitcode = EXIT_FAILURE;
1197
goto end;
1198
}
1199
uint16_t port;
2423
1200
errno = 0;
2424
1201
tmpmax = strtoimax(address+1, &tmp, 10);
2425
1202
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2426
or tmpmax != (in_port_t)tmpmax){
2427
fprintf_plus(stderr, "Bad port number\n");
2428
exitcode = EX_USAGE;
2429
goto end;
2430
}
2431
2432
if(quit_now){
2433
goto end;
2434
}
2435
2436
port = (in_port_t)tmpmax;
1203
or tmpmax != (uint16_t)tmpmax){
1204
fprintf(stderr, "Bad port number\n");
1205
exitcode = EXIT_FAILURE;
1206
goto end;
1207
}
1208
port = (uint16_t)tmpmax;
2437
1209
*address = '\0';
1210
address = connect_to;
2438
1211
/* Colon in address indicates IPv6 */
2439
1212
int af;
2440
if(strchr(connect_to, ':') != NULL){
1213
if(strchr(address, ':') != NULL){
2441
1214
af = AF_INET6;
2442
/* Accept [] around IPv6 address - see RFC 5952 */
2443
if(connect_to[0] == '[' and address[-1] == ']')
2444
{
2445
connect_to++;
2446
address[-1] = '\0';
2447
}
2448
1215
} else {
2449
1216
af = AF_INET;
2450
1217
}
2451
address = connect_to;
2452
2453
if(quit_now){
2454
goto end;
2455
}
2456
2457
while(not quit_now){
2458
ret = start_mandos_communication(address, port, if_index, af,
2459
&mc);
2460
if(quit_now or ret == 0){
2461
break;
2462
}
2463
if(debug){
2464
fprintf_plus(stderr, "Retrying in %d seconds\n",
2465
(int)retry_interval);
2466
}
2467
sleep((unsigned int)retry_interval);
2468
}
2469
2470
if(not quit_now){
1218
ret = start_mandos_communication(address, port, if_index, af);
1219
if(ret < 0){
1220
exitcode = EXIT_FAILURE;
1221
} else {
2471
1222
exitcode = EXIT_SUCCESS;
2472
1223
}
1224
goto end;
1225
}
2473
1226
2474
goto end;
2475
}
2476
2477
if(quit_now){
2478
goto end;
2479
}
2480
2481
1227
{
2482
1228
AvahiServerConfig config;
2483
1229
/* Do not publish any local Zeroconf records */
2488
1234
config.publish_domain = 0;
2489
1235
2490
1236
/* Allocate a new server */
2491
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2492
&config, NULL, NULL, &ret_errno);
1237
mc.server = avahi_server_new(avahi_simple_poll_get
1238
(mc.simple_poll), &config, NULL,
1239
NULL, &error);
2493
1240
2494
1241
/* Free the Avahi configuration data */
2495
1242
avahi_server_config_free(&config);
2497
1244
2498
1245
/* Check if creating the Avahi server object succeeded */
2499
1246
if(mc.server == NULL){
2500
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2501
avahi_strerror(ret_errno));
2502
exitcode = EX_UNAVAILABLE;
2503
goto end;
2504
}
2505
2506
if(quit_now){
1247
fprintf(stderr, "Failed to create Avahi server: %s\n",
1248
avahi_strerror(error));
1249
exitcode = EXIT_FAILURE;
2507
1250
goto end;
2508
1251
}
2509
1252
2510
1253
/* Create the Avahi service browser */
2511
1254
sb = avahi_s_service_browser_new(mc.server, if_index,
2512
1255
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2513
NULL, 0, browse_callback,
2514
(void *)&mc);
1256
NULL, 0, browse_callback, NULL);
2515
1257
if(sb == NULL){
2516
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2517
avahi_strerror(avahi_server_errno(mc.server)));
2518
exitcode = EX_UNAVAILABLE;
2519
goto end;
2520
}
2521
2522
if(quit_now){
1258
fprintf(stderr, "Failed to create service browser: %s\n",
1259
avahi_strerror(avahi_server_errno(mc.server)));
1260
exitcode = EXIT_FAILURE;
2523
1261
goto end;
2524
1262
}
2525
1263
2526
1264
/* Run the main loop */
2527
1265
2528
1266
if(debug){
2529
fprintf_plus(stderr, "Starting Avahi loop search\n");
1267
fprintf(stderr, "Starting Avahi loop search\n");
2530
1268
}
2531
1269
2532
ret = avahi_loop_with_timeout(simple_poll,
2533
(int)(retry_interval * 1000), &mc);
2534
if(debug){
2535
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2536
(ret == 0) ? "successfully" : "with error");
2537
}
1270
avahi_simple_poll_loop(mc.simple_poll);
2538
1271
2539
1272
end:
2540
1273
2541
1274
if(debug){
2542
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1275
fprintf(stderr, "%s exiting\n", argv[0]);
2543
1276
}
2544
1277
2545
1278
/* Cleanup things */
2546
free(mc.interfaces);
2547
2548
1279
if(sb != NULL)
2549
1280
avahi_s_service_browser_free(sb);
2550
1281
2551
1282
if(mc.server != NULL)
2552
1283
avahi_server_free(mc.server);
2553
1284
2554
if(simple_poll != NULL)
2555
avahi_simple_poll_free(simple_poll);
1285
if(mc.simple_poll != NULL)
1286
avahi_simple_poll_free(mc.simple_poll);
2556
1287
2557
1288
if(gnutls_initialized){
2558
1289
gnutls_certificate_free_credentials(mc.cred);
2564
1295
gpgme_release(mc.ctx);
2565
1296
}
2566
1297
2567
/* Cleans up the circular linked list of Mandos servers the client
2568
has seen */
2569
if(mc.current_server != NULL){
2570
mc.current_server->prev->next = NULL;
2571
while(mc.current_server != NULL){
2572
server *next = mc.current_server->next;
2573
free(mc.current_server);
2574
mc.current_server = next;
2575
}
2576
}
2577
2578
/* Re-raise privileges */
2579
{
2580
ret_errno = raise_privileges();
2581
if(ret_errno != 0){
2582
perror_plus("Failed to raise privileges");
1298
/* Removes the temp directory used by GPGME */
1299
if(tempdir_created){
1300
DIR *d;
1301
struct dirent *direntry;
1302
d = opendir(tempdir);
1303
if(d == NULL){
1304
if(errno != ENOENT){
1305
perror("opendir");
1306
}
2583
1307
} else {
2584
2585
/* Run network hooks */
2586
run_network_hooks("stop", interfaces_hooks != NULL ?
2587
interfaces_hooks : "", delay);
2588
2589
/* Take down the network interfaces which were brought up */
2590
{
2591
char *interface = NULL;
2592
while((interface=argz_next(interfaces_to_take_down,
2593
interfaces_to_take_down_size,
2594
interface))){
2595
ret_errno = take_down_interface(interface);
2596
if(ret_errno != 0){
2597
errno = ret_errno;
2598
perror_plus("Failed to take down interface");
2599
}
2600
}
2601
if(debug and (interfaces_to_take_down == NULL)){
2602
fprintf_plus(stderr, "No interfaces needed to be taken"
2603
" down\n");
2604
}
2605
}
2606
}
2607
2608
ret_errno = lower_privileges_permanently();
2609
if(ret_errno != 0){
2610
perror_plus("Failed to lower privileges permanently");
2611
}
2612
}
2613
2614
free(interfaces_to_take_down);
2615
free(interfaces_hooks);
2616
2617
/* Removes the GPGME temp directory and all files inside */
2618
if(tempdir != NULL){
2619
struct dirent **direntries = NULL;
2620
struct dirent *direntry = NULL;
2621
int numentries = scandir(tempdir, &direntries, notdotentries,
2622
alphasort);
2623
if(numentries > 0){
2624
for(int i = 0; i < numentries; i++){
2625
direntry = direntries[i];
1308
while(true){
1309
direntry = readdir(d);
1310
if(direntry == NULL){
1311
break;
1312
}
1313
/* Skip "." and ".." */
1314
if(direntry->d_name[0] == '.'
1315
and (direntry->d_name[1] == '\0'
1316
or (direntry->d_name[1] == '.'
1317
and direntry->d_name[2] == '\0'))){
1318
continue;
1319
}
2626
1320
char *fullname = NULL;
2627
1321
ret = asprintf(&fullname, "%s/%s", tempdir,
2628
1322
direntry->d_name);
2629
1323
if(ret < 0){
2630
perror_plus("asprintf");
1324
perror("asprintf");
2631
1325
continue;
2632
1326
}
2633
1327
ret = remove(fullname);
2634
1328
if(ret == -1){
2635
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2636
strerror(errno));
1329
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1330
strerror(errno));
2637
1331
}
2638
1332
free(fullname);
2639
1333
}
2640
}
2641
2642
/* need to clean even if 0 because man page doesn't specify */
2643
free(direntries);
2644
if(numentries == -1){
2645
perror_plus("scandir");
1334
closedir(d);
2646
1335
}
2647
1336
ret = rmdir(tempdir);
2648
1337
if(ret == -1 and errno != ENOENT){
2649
perror_plus("rmdir");
2650
}
2651
}
2652
2653
if(quit_now){
2654
sigemptyset(&old_sigterm_action.sa_mask);
2655
old_sigterm_action.sa_handler = SIG_DFL;
2656
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2657
&old_sigterm_action,
2658
NULL));
2659
if(ret == -1){
2660
perror_plus("sigaction");
2661
}
2662
do {
2663
ret = raise(signal_received);
2664
} while(ret != 0 and errno == EINTR);
2665
if(ret != 0){
2666
perror_plus("raise");
2667
abort();
2668
}
2669
TEMP_FAILURE_RETRY(pause());
1338
perror("rmdir");
1339
}
2670
1340
}
2671
1341
2672
1342
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0